CN214315673U - Chargeable equipment and charge indicator lamp control circuit thereof - Google Patents
Chargeable equipment and charge indicator lamp control circuit thereof Download PDFInfo
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Abstract
A rechargeable device and a charging indicator lamp control circuit thereof comprise a first indicator lamp circuit, a second indicator lamp circuit and a third indicator lamp circuit, wherein the first indicator lamp circuit is used for taking the charging circuit as an electric energy source of a first indicator lamp; controlling the first indicator light to be turned off and on according to the open-drain output or high-low level of a charging state pin of the charging management chip; the second indicator light circuit is used for controlling the on and off of a second indicator light by taking the charging circuit as an electric energy source of the second indicator light according to the on-off output or high-low level of a charging state pin of the charging management chip; the third indicator light circuit is used for taking the power supply circuit as an electric energy source of the third indicator light, controlling the third indicator light to be on or off according to the on-off signal, and controlling the first indicator light to be off and the second indicator light to be off in the on-state. Therefore, under the condition that only one charging state pin is needed, the three indicator lamps can prompt more state information.
Description
Technical Field
The invention relates to the field of rechargeable equipment, in particular to rechargeable equipment and a charging indicator lamp control circuit thereof.
Background
In a rechargeable device, such as a charger, a lithium battery charging IC (charging management chip) inside the rechargeable device has several pins specially for indicating the charge of the battery to be charged. If the electric quantity is less than 33.3%, the lamp is completely extinguished. The power is between 33.3% and 66.7%, the LED1 is on, the LED2 is off, and the LED3 is off. The electric quantity is between 66.6% and 99.9%, the LED1 is on, the LED2 is on, and the LED3 is off. After full, full brightness. The number of lights may be 4 or 5, facilitating the indication of a finer power step. The lithium battery charging IC is generally a low-end product, does not have high-level functions such as communication and the like, and has few protective measures.
The high-end lithium battery charging IC has a communication function, or meets a JEITA safe charging protocol, and has more safety protection measures, because the functions are more, the pins of the charging IC are tense, and only one pin is reserved to indicate the charging state. Such as BQ24171 or BQ24170 from texas instruments, only one pin is set aside to indicate the charge status. However, the information output from one pin of the charging IC is limited, and for example, a method of displaying two states by one IO is proposed in patent CN110380471A, a control circuit of a dual charging indicator lamp and a control method thereof. The circuit diagram is shown in fig. 1, and the principle is that during the charging process, the CHG _ LED is in a high-impedance state, the green indicator light CR1 is turned off, the Q6 tube is turned on, and the red indicator light CR2 is turned on. After full, the CHG _ LED is low to ground, the green indicator CR1 lights, Q6 does not conduct, and the red indicator CR2 goes out. However, the scheme has less indication state and gives less information to the user.
Disclosure of Invention
The invention provides a rechargeable device and a charging indicator lamp control circuit thereof, which can realize more state prompts under the condition that the number of charging state pins of a charging management chip is insufficient.
According to a first aspect, a charge indicator lamp control circuit for a rechargeable device, the rechargeable device comprising a charging circuit for charging a battery and a power supply circuit for powering an electrical consumer within the rechargeable device upon power-up; the charging indicator lamp control circuit comprises a first indicator lamp circuit, a second indicator lamp circuit and a third indicator lamp circuit,
the first indicator light circuit is used for taking the charging circuit as an electric energy source of the first indicator light; controlling the first indicator light to be turned off and on according to the open-drain output or high-low level of a charging state pin of the charging management chip;
the second indicator light circuit is used for controlling the on and off of a second indicator light by taking the charging circuit as an electric energy source of the second indicator light according to the on-off output or high-low level of a charging state pin of the charging management chip;
the third indicator light circuit is used for taking the power supply circuit as an electric energy source of the third indicator light, controlling the third indicator light to be on or off according to the on-off signal, and controlling the first indicator light to be off and the second indicator light to be off in the on-state.
In the control circuit of the charge indicator lamp,
the input end of the first indicator light circuit is used for being connected with the charging circuit, the first output end of the first indicator light circuit is used for being connected with a charging state pin of the charging management chip, and the charging state pin is used for indicating a charging state;
the input end of the second indicator light circuit is connected with the second output end of the first indicator light circuit, the control end of the second indicator light circuit is used for being connected with a charging state pin of the charging management chip, and the output end of the second indicator light circuit is grounded;
the input end of the third indicator light circuit is used for being connected with the power supply circuit, the control end of the third indicator light circuit is connected with the second output end of the first indicator light circuit, and the output end of the third indicator light circuit is grounded.
In the charging indicator lamp control circuit, the first indicator lamp circuit comprises a first resistor, a second resistor and a first indicator lamp; one end of the first resistor is used for being connected with the charging circuit; the other end of the first resistor is connected with one end of the second resistor and the anode of the first indicator light; and the negative electrode of the first indicator light is used for being connected with a charging state pin of the charging management chip and is also connected with the other end of the second resistor.
In the charging indicator lamp control circuit, the second indicator lamp circuit comprises a third resistor, a fourth resistor, a first transistor and a second indicator lamp; the anode of the second indicator light is connected with the other end of the first resistor; the negative pole of the second indicator light is connected with the first pole of the first transistor, the second pole of the first transistor is grounded, the control pole of the first transistor is connected with one end of the third resistor and one end of the fourth resistor, the other end of the third resistor is connected with the charging state pin of the charging management chip, and the other end of the fourth resistor is grounded.
In the charging indicator lamp control circuit, the third indicator lamp circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, a second transistor and a third indicator lamp; one end of the fifth resistor is used for being connected with the power supply circuit and is also connected with one end of the sixth resistor, the other end of the fifth resistor is connected with the anode of the third indicator light, the cathode of the third indicator light is grounded, the other end of the sixth resistor is connected with the control electrode of the second transistor and one end of the seventh resistor, the first electrode of the second transistor is connected with the other end of the first resistor, and the second electrode of the second transistor and the other end of the seventh resistor are both grounded.
In the charging indicator lamp control circuit, the first transistor and the second transistor are both NPN type triodes, collectors of the NPN type triodes are first poles of the first transistor and the second transistor, emitters of the NPN type triodes are second poles of the first transistor and the second transistor, and bases of the NPN type triodes are control poles of the first transistor and the second transistor.
According to a second aspect, a chargeable device comprises:
the charging circuit is used for charging the battery and comprises a charging management chip;
the power supply circuit is used for supplying power to electrical appliances in the rechargeable equipment after the rechargeable equipment is started;
the control circuit of the charging indicator lamp.
In the rechargeable equipment, the power supply circuit comprises a key for controlling the on/off of the rechargeable equipment, and the key comprises a transparent key cap and a switch for controlling the on/off of the rechargeable equipment; the switch is located the button cap below, first pilot lamp, second pilot lamp and third pilot lamp are as the backlight of button, are located button cap below.
In the rechargeable device, the key cap is a silica gel cap, and the first indicator light, the second indicator light and the third indicator light are all light emitting diodes; the first indicator light, the second indicator light and the third indicator light are different in color, or the first indicator light, the second indicator light and the third indicator light are different in brightness.
The rechargeable equipment further comprises a processor and a display screen, and the power supply circuit supplies power to the processor and the display screen; the processor is connected with a charging state pin of the charging management chip and is used for displaying the charging state through a display screen; the model of the charging management chip is BQ24170 or BQ 24171.
The rechargeable device and the control circuit of the charging indicator lamp thereof according to the above embodiment comprise a first indicator lamp circuit, a second indicator lamp circuit and a third indicator lamp circuit, wherein the first indicator lamp circuit is used for taking the charging circuit as an electric energy source of the first indicator lamp; controlling the first indicator light to be turned off and on according to the open-drain output or high-low level of a charging state pin of the charging management chip; it can be seen that the charging circuit and the charging state may determine the turning off and on of the first indicator light. The second indicator light circuit is used for controlling the on and off of a second indicator light by taking the charging circuit as an electric energy source of the second indicator light according to the on-off output or high-low level of a charging state pin of the charging management chip; it can be seen that the charging circuit and the charging state can determine the on and off of the first indicator light. The third indicator light circuit is used for taking the power supply circuit as an electric energy source of the third indicator light, controlling the third indicator light to be on or off according to the on-off signal, and controlling the first indicator light to be off and the second indicator light to be off in the on-state. Therefore, the on-off signal can determine the on and off of the third indicator light, and the third indicator light circuit can control the first indicator light and the second indicator light to be off, so that the three indicator lights can prompt more state information under the condition that only one charging state pin is needed.
Drawings
FIG. 1 is a prior art indicator light control circuit;
fig. 2 is a block diagram of a rechargeable device according to an embodiment of the present invention;
fig. 3 is a block diagram of an embodiment of an indicator light control circuit provided in the present invention;
fig. 4 is a circuit diagram of an embodiment of an indicator light control circuit provided by the present invention;
fig. 5 is a diagram showing three indicator lights corresponding to five states in the rechargeable device according to the present invention;
fig. 6 is a schematic diagram of a key in the rechargeable device according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Referring to fig. 2, the rechargeable device of the present invention includes a charging circuit 10, a rechargeable battery 20, a power supply circuit 30, and a charging indicator lamp control circuit. The charging circuit 10 connects the battery 20 and the power supply circuit 30.
The charging circuit 10 is used for charging the battery 20, the battery 20 is a rechargeable battery, and the present embodiment is described by taking a lithium battery as an example. The charging circuit 10 includes an interface for obtaining electric energy from the outside of the chargeable device and a charging management chip 110. The interface may be an interface for connecting with a power adapter, or may be various communication interfaces capable of transmitting electric energy, such as a USB interface. The charge management chip 110 is used for charge management of the battery, and in this embodiment, the model may be BQ24170 or BQ24171 from TI (texas instruments). In some embodiments, the charging management chip 110 may have only one charging status pin for indicating the charging status, and the charging status pin can output a charging status signal, which can reflect various states of charging through the open-drain output or the high-low level.
The power supply circuit 30 is used for supplying power to electrical appliances in the rechargeable device after the rechargeable device is powered on. For example, the power supply circuit 30 may include a key 310 and a power supply regulation circuit 320 for controlling the powering on and off of the rechargeable device. The power supply output terminal of the charging management chip 110 is connected to the input terminal of the power supply voltage stabilizing circuit 320 through the key 310. The power supply voltage stabilizing circuit 320 is used for stabilizing the dc power output by the charging management chip 110. The output terminal of the power supply voltage stabilizing circuit 320 can be connected to various electrical appliances, such as a processor.
As shown in fig. 3, the charge indicator lamp control circuit includes a first indicator lamp circuit 610, a second indicator lamp circuit 620, and a third indicator lamp circuit 630.
The first indicator light circuit 610 is used for taking the charging circuit 10 as a power source of the first indicator light; according to the open-drain output or high-low level of the charging state pin of the charging management chip 110, the first indicator lamp is controlled to be turned off or on.
The second indicator lamp circuit 620 is configured to use the charging circuit 10 as a power source of the second indicator lamp, and control on and off of the second indicator lamp according to the open-drain output or the high-low level of the charging status pin of the charging management chip 110.
The charging circuit 10 is charged to indicate that the rechargeable device is connected to an external power source, such as a power adapter, a USB cable, etc., so one of the first indicator light circuit 610 and the second indicator light circuit 620 may light an indicator light to indicate a charging status, and the other may light an indicator light to indicate a full-charging status.
The third indicator light circuit 630 is configured to use the power supply circuit 30 as a power source of the third indicator light, control on and off of the third indicator light according to the power on/off signal, and control the first indicator light to be off and control the second indicator light to be off in the power on state. The power supply circuit 30 is charged to indicate that the rechargeable device is powered on, so the third indicator light can indicate the power on/off state.
The input end of the first indicator light circuit 610 is connected to the charging circuit 10, and the input end of the first indicator light circuit 610 may be connected to the interface, or may be connected between the charging management chip 110 and the battery 20, and the former is taken as an example for description in this embodiment; that is, the voltage input by the input end of the first indicator light circuit 610 may be a charging input voltage Vcharge _ input, or may be a voltage processed by Vcharge _ input, and the voltage exists when the rechargeable device is connected to an external power supply, otherwise, the voltage is zero (no voltage), and of course, the input end of the first indicator light circuit 610 may also be connected to another node of the charging circuit 10, as long as it can reflect whether the rechargeable device is connected to the external power supply through the voltage. The first output terminal of the first indicator lamp circuit 610 is connected to the Charge state pin of the Charge management chip 110, so that the on/off state between the voltage Charge state of the Charge state pin and the voltage Vcharge _ input determines the on/off state between the input terminal and the first output terminal of the first indicator lamp circuit 610, and the first indicator lamp is connected in series between the input terminal and the first output terminal of the first indicator lamp circuit 610. The charge management chip (charging IC)110 takes the BQ24171 of TI as an example, the charging state pin is an open-drain output, the charging state (normal charging) is a low resistance to ground (low resistance state), the fully charging state is a high resistance (high resistance state), and the abnormal state is cyclically changed in high resistance and low resistance in a period of 0.5 seconds. In the embodiment in which the charge state pin outputs the high and low levels, the charging state (normal charging) is the low level, the fully charged state is the high level, and the abnormal state is cyclically changed in the high and low levels in a period of 0.5 seconds.
The input end of the second indicator light circuit 620 is connected to the second output end of the first indicator light circuit 610, the control end of the second indicator light circuit 620 is connected to the charge state pin of the charge management chip, and the output end of the second indicator light circuit 620 is grounded. The second indicator light is connected in series between the input terminal of the second indicator light circuit 620 and the ground, and the charging state pin controls the on/off of the input terminal of the second indicator light circuit 620 and the ground.
The input terminal of the third indicator light circuit 630 is connected to the power supply circuit 30, and may be connected to any node of the power supply circuit 30, as long as the input terminal of the third indicator light circuit 630 can reflect the on/off of the power on/off button. In this embodiment, the input terminal of the third indicator light circuit 630 is connected to the output terminal of the power supply voltage stabilizing circuit 320. The power supply voltage stabilizing circuit 320 outputs a stable preset voltage Vsystem, and when the rechargeable device is in a shutdown state, the voltage of Vsystem is 0V. The control terminal of the third indicator light circuit 630 is connected to the second output terminal of the first indicator light circuit 610, and the output terminal of the third indicator light circuit 630 is grounded. The third indicator light is connected between the input end of the third indicator light circuit 630 and the ground, so that the on/off of the third indicator light reflects the on/off state of the rechargeable device.
The first indicator light, the second indicator light and the third indicator light are respectively provided with three indicator lights with different colors, so that a user can distinguish various states conveniently. In some embodiments, the first indicator light, the second indicator light and the third indicator light are respectively provided with three indicator lights with different brightness, so that a user can distinguish various states conveniently.
Fig. 4 shows an embodiment of a control circuit for a charge indicator lamp, wherein the first indicator lamp circuit 610 includes a first resistor R1, a second resistor R2, and a first indicator lamp LED 1. The first indicator LED1 may be a variety of light sources, and in this embodiment, the first indicator LED1 is a Light Emitting Diode (LED). One end of the first resistor R1 is an input end of the first indicator light circuit 610 and is connected to the charging circuit 10. The other end of the first resistor R1 is a second output end of the first indicator light circuit 610, and is connected to one end of the second resistor R2 and the anode of the first indicator light LED 1. The cathode of the first indicator light LED1 is a first output terminal of the first indicator light circuit 610, and is connected to the charge status pin of the charge management chip 110 and to the other end of the second resistor R2.
The second indicator light circuit 620 includes a third resistor R3, a fourth resistor R4, a first transistor Q1, and a second indicator light LED 2. The second indicator LED2 may be a variety of light sources, and in this embodiment, the second indicator LED2 is a Light Emitting Diode (LED). The anode of the second indicator light LED2 is the input end of the second indicator light circuit 620 and is connected with the other end of the first resistor R1; the cathode of the second indicator light LED2 is connected to the first pole of the first transistor Q1. A second electrode of the first transistor Q1 is the output terminal of the second indicator light circuit 620, which is connected to ground. A control electrode of the first transistor Q1 is connected to one end of the third resistor R3 and one end of the fourth resistor R4. The other end of the third resistor R3 is a control end of the second indicator light circuit 620, and is connected to the Charge state pin Charge state of the Charge management chip, and the other end of the fourth resistor R4 is grounded. The first transistor Q1 is an NPN transistor, a collector of the NPN transistor is a first pole of the first transistor Q1, an emitter of the NPN transistor is a second pole of the first transistor Q1, and a base of the NPN transistor is a control pole of the first transistor Q1. The first transistor Q1 functions as a switch control.
The third indicator light circuit 630 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second transistor Q2, and a third indicator light LED 3. The third indicator LED3 may be a variety of light sources, and in this embodiment, the third indicator LED3 is a Light Emitting Diode (LED). One end of the fifth resistor R5 is an input terminal of the third indicator light circuit 630, and is connected to the power supply circuit 30 and one end of the sixth resistor R6. The other end of the fifth resistor R5 is connected to the anode of the third indicator LED3, the cathode of the third indicator LED3 is grounded, and the other end of the sixth resistor R6 is connected to the control electrode of the second transistor Q2 and one end of the seventh resistor R7. A first terminal of the second transistor Q2 is a control terminal of the third indicator light circuit 630, and is connected to the other terminal of the first resistor R1. The second pole of the second transistor Q2 and the other end of the seventh resistor R7 are both grounded. The second transistor Q2 is also an NPN transistor, a collector of the NPN transistor is a first pole of the second transistor Q2, an emitter of the NPN transistor is a second pole of the second transistor Q2, and a base of the NPN transistor is a control pole of the second transistor Q2. The second transistor Q2 functions as a switch control.
Fig. 5 shows five states of the chargeable device that three indicator lights can indicate. The operation of these five states is explained below.
State 1: the rechargeable device is powered on and the power supply circuit 30 has a voltage Vsystem output, whether the system is powered by an adapter or a battery. At this time, the fifth resistor R5 and the third indicator LED3 form a current loop, and the third indicator LED3 is turned on. Meanwhile, when VQ2B (base voltage of Q2) — Vsystem R7/(R6+ R7) >0.6V, that is, the voltage between the base voltage and the emitter of Q2 is greater than 0.6V, Q2 is turned on, and the collector voltage of Q2 is close to 0V, that is, the voltages of the positive electrodes of first indicator light LED1 and second indicator light LED2 are close to 0V. LED1 and LED2 will not light up regardless of whether a power adapter is plugged in, i.e., in what state Vcharge _ input and Charge state. In some embodiments, the rechargeable device further includes a processor 40 and a display 50, and the power supply circuit 30 supplies power to the processor 40 and the display 50. The processor 40 is connected to a Charge state pin (Charge _ state) of the Charge management chip 110, and is configured to display the Charge state through the display screen 50. That is, in the state 1, the charging state is displayed through the display screen 50.
State 2: the rechargeable device is powered off and not connected to an external power source (such as an adapter, etc.), and Vcharge _ input, Charge state, and Vsystem are all 0V or high impedance. So 3 indicator lights are all off.
State 3: vsystem is 0V, Charge state is 0V, and the power supply circuit 10 outputs a voltage Vcharge _ input. Since Vsystem is 0V, LED3 goes off while Q2 is not conducting. Vcharge _ input has a voltage output, and since the Charge state is 0V, R1 and LED1 form a current loop, and LED1 is on. Since VQ1B (the voltage at the base of Q1) is charged state R4/(R3+ R4) is 0V, Q1 is not turned on, and LED2 is turned off.
And 4: vsystem is 0V, Charge state is high impedance, and the power supply circuit 10 outputs a voltage Vcharge _ input. Since Vsystem is 0V, LED3 goes off while Q2 is not conducting. Since Charge state is high impedance, Vcharge _ input, R1, LED1, and Charge state cannot form a current loop. In addition, the total resistance of the R1, the R3 and the R4 is large enough, the LED1 cannot be on, in order to further prevent the LED1 from emitting weak light, a second resistor R2 is connected in parallel with the LED1, and the resistance value of the second resistor R2 is far smaller than that of the R1+ R3+ R4. The LED1 will not be lit. At this time, VQ1B ═ Vcharge _ input × R4/(R1+ R2// RLED1+ R3+ R4) >0.6V, that is, the voltage between the base and emitter of Q1 is greater than 0.6V, and Q1 is turned on. Vcharge _ input, R1, LED2, and Q1 form a current loop, and LED2 is on.
And state 5: when charging is abnormal, the Charge state can be switched between high resistance and low resistance circularly until the abnormality disappears. This is a characteristic of some charging ICs, such as BQ24170 and BQ24171 for TI, and when charging is abnormal, the Charge state will cycle between high and low resistances with a period of 0.5 s. When an abnormality occurs, the working principle of the circuit is that the state 3 and the state 4 are circularly switched.
In this embodiment, as shown in fig. 6, the button 310 includes a light-transmissive button cap 311 and a switch (not shown) for controlling the on/off of the rechargeable device. The power supply output terminal of the charging management chip 110 is connected to the input terminal of the power supply voltage stabilizing circuit 320 through the switch. The switch is located below the key cap 311, and the first indicator light, the second indicator light and the third indicator light are located below the key cap 311 as backlight sources of the keys. In other words, the key cap 311 covers three indicator lights and switches, and an icon for turning on and off the device is further provided on the key cap 311. In this embodiment, the key cap 311 is a silica gel cap, which not only plays a role of a key, but also can transmit light. As can be seen from FIG. 5, in any state, at most one indicator light is on, so that placing the 3 lights under the same light-transmitting silicone key will not interfere with each other. Thus, the buttons 310 present to the user the effect of: the charging state is represented by three colors of a key lamp, the charging state, the full charging state and the starting state are represented by three colors of the key lamp, the non-lighting state represents that the power supply is not started and is not connected with an external power supply, and the charging abnormality is represented by the two colors of the key lamp which are alternately lighted. Therefore, the switch key not only serves as a switch for switching on and off, but also can indicate five states, and the appearance is concise and attractive.
In this embodiment, the state display process of the rechargeable device is that the charging indicator lamp control circuit determines whether the rechargeable device is powered on. And if the power supply is not started and the battery is not charged, the indicator lamp is not on. When the battery is not started and is being charged, only the first indicator light is on. And if the power supply is not started and is fully charged, only the second indicating lamp is on. And if the charging is abnormal without starting up, the first indicator light and the second indicator light are alternately turned on. The charging indicator lamp control circuit judges that the rechargeable device is started, only the third indicator lamp is on, and the charging state can be displayed by the display screen at the moment, for example, during charging, the display screen displays a battery icon which displays green and displays the battery power percentage; fully charged, the battery icon shows black, and the electric quantity shows 100%; charging is abnormal, the battery icon shows red, and the display color is red! ".
To sum up, the Charge indicator lamp control circuit realizes the prompt of five states by introducing a voltage (Vcharge _ input) related to charging and a voltage (Vsystem) related to power supply and matching with a Charge state pin (Charge state) of the Charge management chip, and only needs to occupy one Charge state pin of the Charge management chip. And the three indicator lights are concentrated on one light-transmitting silica gel key to display five states of starting, charging, full charging, abnormal charging and non-charging, and do not interfere with each other.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A charge indicator lamp control circuit of a rechargeable device comprises a charging circuit for charging a battery and a power supply circuit for supplying power to electrical appliances in the rechargeable device after being started; it is characterized in that the charging indicator lamp control circuit comprises a first indicator lamp circuit, a second indicator lamp circuit and a third indicator lamp circuit,
the first indicator light circuit is used for taking the charging circuit as an electric energy source of the first indicator light; controlling the first indicator light to be turned off and on according to the open-drain output or high-low level of a charging state pin of the charging management chip;
the second indicator light circuit is used for controlling the on and off of a second indicator light by taking the charging circuit as an electric energy source of the second indicator light according to the on-off output or high-low level of a charging state pin of the charging management chip;
the third indicator light circuit is used for taking the power supply circuit as an electric energy source of the third indicator light, controlling the third indicator light to be on or off according to the on-off signal, and controlling the first indicator light to be off and the second indicator light to be off in the on-state.
2. The charge indicator lamp control circuit of claim 1,
the input end of the first indicator light circuit is used for being connected with the charging circuit, the first output end of the first indicator light circuit is used for being connected with a charging state pin of the charging management chip, and the charging state pin is used for indicating a charging state;
the input end of the second indicator light circuit is connected with the second output end of the first indicator light circuit, the control end of the second indicator light circuit is used for being connected with a charging state pin of the charging management chip, and the output end of the second indicator light circuit is grounded;
the input end of the third indicator light circuit is used for being connected with the power supply circuit, the control end of the third indicator light circuit is connected with the second output end of the first indicator light circuit, and the output end of the third indicator light circuit is grounded.
3. The charge indicator lamp control circuit of claim 1, wherein the first indicator lamp circuit comprises a first resistor, a second resistor, and a first indicator lamp; one end of the first resistor is used for being connected with the charging circuit; the other end of the first resistor is connected with one end of the second resistor and the anode of the first indicator light; and the negative electrode of the first indicator light is used for being connected with a charging state pin of the charging management chip and is also connected with the other end of the second resistor.
4. The charge indicator lamp control circuit of claim 3, wherein the second indicator lamp circuit comprises a third resistor, a fourth resistor, a first transistor, and a second indicator lamp; the anode of the second indicator light is connected with the other end of the first resistor; the negative pole of the second indicator light is connected with the first pole of the first transistor, the second pole of the first transistor is grounded, the control pole of the first transistor is connected with one end of the third resistor and one end of the fourth resistor, the other end of the third resistor is connected with the charging state pin of the charging management chip, and the other end of the fourth resistor is grounded.
5. The charge indicator lamp control circuit according to claim 4, wherein the third indicator lamp circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, a second transistor, and a third indicator lamp; one end of the fifth resistor is used for being connected with the power supply circuit and is also connected with one end of the sixth resistor, the other end of the fifth resistor is connected with the anode of the third indicator light, the cathode of the third indicator light is grounded, the other end of the sixth resistor is connected with the control electrode of the second transistor and one end of the seventh resistor, the first electrode of the second transistor is connected with the other end of the first resistor, and the second electrode of the second transistor and the other end of the seventh resistor are both grounded.
6. The charge indicator lamp control circuit according to claim 5, wherein the first transistor and the second transistor are both NPN transistors, collectors of the NPN transistors are first poles of the first transistor and the second transistor, emitters of the NPN transistors are second poles of the first transistor and the second transistor, and bases of the NPN transistors are control poles of the first transistor and the second transistor.
7. A chargeable device, comprising:
the charging circuit is used for charging the battery and comprises a charging management chip;
the power supply circuit is used for supplying power to electrical appliances in the rechargeable equipment after the rechargeable equipment is started;
the charge indicator lamp control circuit according to any one of claims 1 to 6.
8. The rechargeable device of claim 7 wherein the power supply circuit includes a key for controlling the powering on and off of the rechargeable device, the key including a light transmissive key cap and a switch for controlling the powering on and off of the rechargeable device; the switch is located the button cap below, first pilot lamp, second pilot lamp and third pilot lamp are as the backlight of button, are located button cap below.
9. The rechargeable device of claim 8 wherein the key cap is a silicone cap, and the first indicator light, the second indicator light, and the third indicator light are all light emitting diodes; the first indicator light, the second indicator light and the third indicator light are different in color, or the first indicator light, the second indicator light and the third indicator light are different in brightness.
10. The chargeable device of claim 7, further comprising a processor and a display screen, the power supply circuit to provide power to the processor and the display screen; the processor is connected with a charging state pin of the charging management chip and is used for displaying the charging state through a display screen; the model of the charging management chip is BQ24170 or BQ 24171.
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| CN202120450719.0U CN214315673U (en) | 2021-03-02 | 2021-03-02 | Chargeable equipment and charge indicator lamp control circuit thereof |
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| CN202120450719.0U CN214315673U (en) | 2021-03-02 | 2021-03-02 | Chargeable equipment and charge indicator lamp control circuit thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114007315A (en) * | 2021-12-31 | 2022-02-01 | 博为科技有限公司 | Ethernet port indicator lamp control circuit and control method |
| CN116937753A (en) * | 2023-09-15 | 2023-10-24 | 江苏舒茨测控设备股份有限公司 | Lithium battery charging indicator lamp double control circuit of electronic equipment |
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2021
- 2021-03-02 CN CN202120450719.0U patent/CN214315673U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114007315A (en) * | 2021-12-31 | 2022-02-01 | 博为科技有限公司 | Ethernet port indicator lamp control circuit and control method |
| CN114007315B (en) * | 2021-12-31 | 2022-05-10 | 博为科技有限公司 | Ethernet port indicator lamp control circuit and control method |
| CN116937753A (en) * | 2023-09-15 | 2023-10-24 | 江苏舒茨测控设备股份有限公司 | Lithium battery charging indicator lamp double control circuit of electronic equipment |
| CN116937753B (en) * | 2023-09-15 | 2023-12-05 | 江苏舒茨测控设备股份有限公司 | Lithium battery charging indicator lamp double control circuit of electronic equipment |
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