KR100561721B1 - Safety device of transformer for neon - Google Patents

Abstract

The present invention relates to a safety device for a transformer for neon,

In the prior art, since the safety device of the transformer was not provided, it was not possible to determine whether the case of the transformer was properly grounded when the transformer was produced on the production line, and the polarity of the power supply on the primary side of the transformer when the transformer was installed in the field. In addition, it is not possible to quickly determine whether the connection is made correctly, and it is not possible to quickly cope with the grounding of the secondary coil of the transformer due to any reason, so that it is expensive due to the polarity inversion of the input power supply or the grounding and opening of the secondary coil. Transformers were damaged or peripheral circuits were frequently damaged. Therefore, in order to solve the above problem, the present invention is to cut off the input power momentarily when the secondary high voltage coil of the magnetic neon transformer is grounded, opened for some reason, or the input side polarity (Hot / Neu) is incorrectly connected. It relates to a safety device of the transformer for neon to prevent damage to the transformer.

Transformer, safety device, polarity inversion detector, ground signal detection, open signal detection, power off

Description

Safety device of transformer for neon

1 is a block diagram showing the overall configuration of the present invention.

2 is a circuit diagram showing the overall configuration of the present invention.

Figure 3 is a circuit diagram showing a power supply applied to the present invention.

Figure 4 is a circuit diagram showing a polarity inversion detection unit applied to the present invention.

5 is a circuit diagram showing a ground signal detection unit applied to the present invention.

Figure 6 is a circuit diagram showing a ground signal amplifier applied to the present invention.

7 is a circuit diagram showing a bypass / set control unit applied to the present invention.

8 is a circuit diagram showing an open signal detection unit applied to the present invention.

Explanation of symbols for main parts of the drawings

1: transformer, 2: case,

3: relay switch, 4: power supply,

5: polarity inversion detector, 6: ground signal detector,

7: ground signal amplifier, 8: bypass / set control,

9: trip hold part, 10: open signal detection part,

91: relay drive unit,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device of a neon transformer, and in particular, when a secondary high voltage coil of a magnetic neon transformer is grounded, opened, or incorrectly connected an input side polarity (Hot / Neu) by some cause, the input power is momentarily. The present invention relates to a safety device for a neon transformer that can be cut off to prevent damage to the transformer.

Generally, the transformer for neon refers to amplifying the voltage induced on the primary side to a high voltage on the secondary side to supply the load side, that is, neon to drive the neon.

Since the output voltage of such neon transformer is very high, if the secondary coil of the transformer is grounded or opened due to some reason or the polarity (Hot / Neu) of the power input to the primary coil is reversed, the high voltage is The leakage of the peripheral circuit and the transformer itself causes a problem.

However, in the prior art, since the safety device of the transformer was not provided, it was not possible to determine whether the case of the transformer was properly grounded when the transformer was produced on the production line. Also, when the transformer was installed in the field, the power supply to the primary side of the transformer was In addition, it is not possible to quickly determine whether the polarity is correctly connected, and it is not possible to quickly cope with the grounding of the secondary coil of the transformer due to some reason. The phenomenon of damage or damage to the peripheral circuits was frequently occurring.

Therefore, in order to solve the above problem, the present invention provides a secondary neon high voltage coil of the magnetic neon transformer, which is grounded or opened for some reason, or when the input side polarity (Hot / Neu) is incorrectly connected, the neon tube is broken, or an output line. When the secondary side is opened apart from the neon tube, an object of the present invention is to provide a safety device for a neon transformer that can cut off the input power momentarily to prevent damage to the transformer.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, FIGS. 1 to 8.

According to the drawings, the present invention

In the case 2, a primary coil L1 to which power is input and a secondary coil L2 for inducing and outputting a high voltage are formed, and in the transformer for neon in which the case 2 is grounded,

First and second power supplies 41 and 42 for generating a ground signal generation voltage and a polarity inversion signal generation voltage as the input power, and a third power supply unit for generating and supplying DC driving voltages of the components to the input power ( A power supply unit 4 composed of 43;

When the input line (Hot, Neu) of the transformer 1 is inverted, it detects this and generates a polarity inversion signal using the voltage supplied from the first power supply unit 41 to bypass and set the control unit 8. A polarity inversion detecting unit 5 for supplying to the trip holding unit 9;

An open signal detection unit 10 for detecting an open state of the transformer 1 and outputting a predetermined open signal to the trip holding unit 9 as a trip signal according to the detection result;

A ground signal detector (6) for outputting a ground detection signal having a predetermined pulse current voltage when the secondary coil (L2) of the transformer (1) is grounded;

A ground signal amplifying unit (7) for amplifying the ground signal output from the ground signal detecting unit (6) and supplying it to the trip holding unit (9);

A bypass switch 81 is provided to test whether the case 2 of the transformer 1 is properly grounded, and a trip hold part is provided depending on whether the polarity inversion signal is input or whether the bypass switch 81 is turned on. A bypass / set controller 8 for selectively supplying the comparison voltage of (9);

When the comparison voltage is not supplied from the bypass / set control unit 8, the relay driver 91 is operated in response to the input of the polarity inversion signal, the open signal or the ground signal, and when the comparison voltage is supplied, A trip holding part 9 which does not drive the relay driver 91 even when a polarity inversion signal or a ground signal is input;

A relay driving unit 91 for driving under the control of the trip holding unit 9 to switch the relay switch 3 installed at the input side of the transformer 1 to be operated; Characterized in that consisting of.

The transformer stabilizer of the present invention configured as described above has a polarity inversion detecting unit 5 when the polarity Hot (Neu) of the power inputted to the primary coil L1 is inverted or the secondary high voltage coil is grounded when the transformer 1 is installed in the field. ) Detects that the polarity of the power supply is reversed, and supplies the polarity inversion detection signal to the bypass / set control unit 8 and the trip hold unit 9, and the ground signal detection unit 6 supplies the transformer 1. ) Detects that the secondary coil is grounded and transmits the ground detection signal to the trip holding unit 9 through the ground signal amplifying unit 7.

The bypass / set control unit 8 selectively supplies the comparison voltage of the trip holding unit 9 according to whether the bypass switch 81 provided on its own is turned on or whether the polarity inversion detection signal is input. When the comparison voltage is not input from the bypass / set control unit 8, the trip hold unit 9 rapidly drives the relay driver 91 to the input of the polarity inversion detection signal or the ground detection signal, thereby transforming the transformer 1. The relay switch 3 provided at the primary end of the primary coil L1 is switched so that power is not supplied to the transformer 1, thereby preventing damage to the transformer 1.

The bypass switch 81 is configured to determine whether the case 2 of the transformer 1 is normally grounded, and is mainly used to determine whether the product produced in the production line is normal. If the case 2 of the transformer 1 is normally grounded when the bypass switch 81 is pressed, the relay switch 3 is not switched even if the secondary high voltage coil L2 of the transformer 1 is forcibly grounded.

Hereinafter, each component applied to the present invention will be described with reference to the accompanying drawings.

3 illustrates a power supply unit 4 applied to the present invention, and includes a transformer T1 sharing an input Hot and Neu with a primary coil L1 of a transformer 1. First to third power supply portions 41 to 43 are configured on the secondary side of T1).

The first power supply unit 41 and the second power supply unit 42 are implemented as a rectifier circuit using a bridge diode, the first power supply unit 41 supplies a voltage for generating a polarity inversion detection signal, and the second power supply unit ( 42 provides a voltage for generating a ground detection signal, and the third power supply 43 is configured to generate a driving voltage 12V using a regulator and a zener diode.

4 shows a polarity inversion detecting unit 5 applied to the present invention.

When the input line of the transformer 1 is inverted, a pair of resistors R16 and R22 to which AC power is applied from the ground terminal of the case 2 and a voltage which is operated on by the voltages applied to the resistors R16 and R22 are operated. When the transistors Q4 and Q5 and the transistor Q5 are turned on, they operate at a voltage supplied from the first power supply 41 so that a polarity inversion signal is generated on the secondary side thereof. It is composed of a photo coupler (Pt) to be supplied to the set control unit (8).

When the polarity inversion detecting unit 5 configured as described above is inverted by the power input Hot (Line) and Neu (Ground) while the case 2 is grounded, at that moment, the AC power starts Hot and the resistors R16, R22 ) And case (2) AC current of 60 Hz flows to the ground wire Neu.

As a result, a bias voltage is formed across the resistor R22, and the voltage generated by the first power supply unit 41 becomes the photocoupler Pt as the transistors Q4 and Q5 connected to Darlington are turned on by the bias voltage. The light emitting diodes flow in the light emitting diodes, and the transistors on the secondary side are turned on by the lighting of the light emitting diodes so that the polarity inversion detection signal is supplied to the trip holding unit 9 and the bypass / set control unit 8.

The polarity inversion detection signal output from the photocoupler (Pt) acts as a kind of trigger signal to operate the trip holding unit (9). Accordingly, the relay switch (3) installed at the input side of the transformer (1) is switched. The power supply to the transformer 1 is thus cut off quickly.

8 illustrates an open signal detection unit 10 applied to the present invention.

Sensor coils L10 and L11 wound around the leakage core of the transformer 1 to detect an open state of the transformer 1;

A bridge diode 101 for rectifying and outputting an open signal sensed by the sensor coils L10 and L11;

An OP-amplifier (102) for amplifying the signal output from the bridge diode (101);

The output voltage of the OP-amplifier 102 is compared with the inverting terminal and compared to output 0V when the transformer 1 is in normal operation, and output a predetermined open signal as a trip signal when the transformer 1 is open. It consists of a part 103.

The open signal detection unit 10 configured as described above is induced with the sensor coils L10 and L11 when a voltage is induced in the secondary high voltage coil when the transformer 1 operates, and the sensor coil L10. The voltage induced at L11 is rectified by the bridge diode 101 and then amplified through the OP amplifier 102 and supplied to the comparator 103.

In this case, since the output of the OP-amplifier 102 is input to the inverting input terminal of the comparator 103, when the voltage of the output of the OP-amplifier 102 is equal to or greater than a predetermined value appears, the output of the comparator 103 is It becomes "0" and no signal is output to the trip part 9.

However, when the transformer 1 is in an open state, no signal is detected in the sensor coils L10 and L11, whereby the output of the bridge diode 101 and the OP amplifier 102 is also zero. do.

At this time, the comparator 103 is to input a voltage of '0' to the inverting input terminal and output a voltage of about 10V or more, and this voltage is an open signal, that is, a trip signal part 9 as a trip signal. To be supplied.

As the open signal (trip signal) is supplied to the trip holding part 9, the trip holding part 9 is operated. Accordingly, the relay switch 3 installed at the input side of the transformer 1 is switched to the transformer ( Power supply to 1) will be cut off quickly.

5 shows a ground signal detection unit 6 applied to the present invention.

Formed by the distribution capacity existing between the core (connected with the middle tap of the secondary high pressure coil L2 of the neon transformer) and the case 2 and the leakage flux present during grounding. It is configured to obtain a ground signal 60 Hz.

In normal operation, no current flows from the (+) pole of the second power supply 42 to the (-) pole, but the instant when the secondary side of the coil (the middle tap of the coil is common to the core) is grounded (a kind of At the moment of ground accident, AC current flows between the core and the case 2 due to leakage flux.

In this case, the alternating current formed by the leakage magnetic flux plays a role of cross-linking from the positive electrode to the negative electrode through the resistor R5 and the case 2 as shown in FIG. 5.

At this time, a ripple AC voltage of 60 mA is detected across the resistor R5, and the detected ground signal is amplified and rectified by the ground signal amplifier 7 and supplied to the trip hold unit 9. .

The ground detection signal generated at both ends of the resistor R5 is divided into an AC component ground signal or a pulsed ground signal of 60 Hz. The AC component ground signal of 60 Hz is a signal generated when the coil L2 is grounded for a predetermined time. The pulsed ground signal is a signal generated when the coil L2 is momentarily grounded.

FIG. 6 illustrates a ground signal amplifier 7 applied to the present invention, wherein the first amplifier 71 amplifies and rectifies an AC component ground signal output through the resistor R5 of the ground signal detector 6. And a second amplifier 72 which amplifies and rectifies the pulse component ground signal output through the resistor R5 of the ground signal detector 6.

The first amplifier 71 and the second amplifier 72 are configured as a plurality of OP-AMP as shown in the figure.

7 shows a bypass / set control unit 8 applied to the present invention.

The timer IC 82 oscillates according to the time constant set by the resistors R37 and R43 and the capacitor C18 when the power is input, and the monostable multi outputs a high signal when the oscillation signal of the timer IC 82 is input. Transistor Q6 for turning on by the high signal of the vibrator 83 and the monostable multivibrator 83 so that the comparison voltage of the trip holding unit 9 is supplied, A transistor Q7 for preventing the timer IC 82 from operating and a transistor for turning off the transistor Q7 when the polarity inversion detection signal is input through a set terminal so that the timer IC 82 operates normally. (Q9), the bypass switch 81 for supplying a high signal to the control terminal of the SCR (Q8) by operating on in accordance with the user's operation, and the transistor Q7 by operating on when the high signal is input to the control terminal. SCR (Q8) to force off The.

Note that the configured timer IC 82 and the monostable multivibrator 83 may be shown as one IC KA556 as shown in FIG.

In the bypass / set control unit 8 configured as described above, the timer IC 82 is oscillated because the resistor R43 and the capacitor C18 are grounded through the diode D20 as the transistor Q7 is turned on at the time of initial power input. The operation becomes impossible, and eventually, the monostable multivibrator 83 and the transistor Q6, which are configured at the rear end thereof, are also turned off so that the comparison voltage cannot be supplied to the trip holding section 9, and thus the comparison voltage is not supplied. At this time, the trip holding unit 9 switches the relay switch 3 immediately when the polarity inversion detection signal or the ground detection signal is input so that power is not supplied to the transformer 1.

Meanwhile, the bypass / set control unit 8 includes a bypass switch 81 for checking whether or not the case 2 of the transformer 1 is grounded. When pressed, the high signal is supplied to the control terminal of the SCR Q8, and the SCR Q8 is turned on. Accordingly, the transistor Q7 is turned off, so that the timer IC 82 starts to oscillate.

The oscillation signal of the timer IC 82 acts as a trigger signal to the monostable multivibrator 83 so that the vibrator 83 outputs a high signal to the transistor Q6, and the transistor Q6 is turned on. The operation is performed to output a predetermined comparison voltage to the trip holding unit 9.

While the oscillation is generated in the timer IC 82 by the ON operation of the bypass switch 81, the transistor Q6 continues to supply the comparison voltage to the trip holding unit 9 while maintaining the ON state. The holding part 9 does not switch the relay switch 3 even if the secondary voltage of the transformer 1 is forcibly grounded while the comparison voltage is supplied.

The purpose of using the bypass switch 81 as described above is to check whether the case 2 is grounded. When the case 2 is normally grounded, the bypass switch 81 is pressed. Even if the secondary coil (L2) of the transformer (1) is grounded, the switching operation of the relay switch (3) is not made. This operation is used to confirm the grounding state of the case (2) during the production process. Will be.

On the other hand, if the polarity of the input power supply, that is, Hot and Neu, of the transformer 1 is reversed in this state, the polarity inversion detection signal output from the polarity inversion detection unit 5 is input through the set terminal, The transistor Q9 is turned on to turn off the SCR Q8. As the SCR Q8 is turned off, the transistor Q7 is turned on again.

As the transistor Q7 is turned on, the resistor R43 and the capacitor C18 are grounded, and the oscillation operation of the timer IC 82 is stopped. As a result, the transistor Q6 is turned off to the trip hold unit 9. The comparison voltage is not output.

When the comparison voltage is not supplied to the trip hold unit 9 as described above, when the secondary coil of the transformer 1 is grounded, the relay switch 3 immediately switches to cut off the input power of the transformer 1. .

Meanwhile, referring to the drawing illustrated in FIG. 2, the trip hold unit 9 is

The input voltage of the ground detection signal, the open signal, or the polarity inversion signal is compared with the comparison voltage set through the bypass / set control unit 8, and the comparison results in outputting a high signal when the input voltage is larger. Section 92;

When the high signal is output from the comparator 92, the relay driver 91 is turned on to drive the relay driver 91. When the high signal is input from the comparator 92, the transistor Q3 maintains its operating state.

The trip hold unit 9 configured as described above immediately compares the input unit 92 when the ground detection signal or the polarity inversion detection signal is input to the comparison unit 92 when the comparison voltage is not input from the bypass / set control unit 8. Outputs a high signal to the transistor Q3, and the transistor Q3 is turned on to drive the relay driver 91 so that the relay switch 3 provided on the input side of the transformer 1 is momentarily switched. Do not supply power to the transformer (1).

On the other hand, the transistor Q3 is maintained once the high signal is input from the comparator 92 so that the switching state of the relay switch 3 is maintained as it is.

When the comparison voltage is input from the bypass / set controller 8, the transistor Q3 and the relay driver do not output a high signal from the comparator 92 even if the ground detection signal or the polarity inversion detection signal is input. All of the 91s are turned off, so that the relay switch 3 is not switched.

As described above, according to the present invention, when the secondary high voltage coil of the magnetic neon transformer is grounded for some reason or the input polarity (Hot / Neu) is incorrectly connected, and the secondary high voltage side is open. In this case, it is possible to expect the effect of providing a safety device for the neon transformer that can cut off the input power momentarily to prevent damage to the transformer.

Claims (5)

In the case 2, a primary coil L1 to which power is input and a secondary coil L2 for inducing and outputting a high voltage are formed, and in the transformer for neon in which the case 2 is grounded, First and second power supplies 41 and 42 for generating a ground signal generation voltage and a polarity inversion signal generation voltage as the input power, and a third power supply unit for generating and supplying DC driving voltages of the components to the input power ( A power supply unit 4 composed of 43; When the input line (Hot, Neu) of the transformer 1 is inverted, it detects this and generates a polarity inversion signal using the voltage supplied from the first power supply unit 41 to bypass and set the control unit 8. A polarity inversion detecting unit 5 for supplying to the trip holding unit 9; An open signal detection unit 10 for detecting an open state of the transformer 1 and outputting a predetermined open signal to the trip holding unit 9 as a trip signal according to the detection result; A ground signal detector (6) for outputting a ground detection signal having a predetermined pulse current voltage when the secondary coil (L2) of the transformer (1) is grounded; A ground signal amplifying unit (7) for amplifying the ground signal output from the ground signal detecting unit (6) and supplying it to the trip holding unit (9); A bypass switch 81 is provided to test whether the case 2 of the transformer 1 is properly grounded, and a trip hold part is provided depending on whether the polarity inversion signal is input or whether the bypass switch 81 is turned on. A bypass / set controller 8 for selectively supplying the comparison voltage of (9); When the comparison voltage is not supplied from the bypass / set control unit 8, the relay driver 91 is operated in response to the input of the polarity inversion signal, the open signal or the ground signal, and when the comparison voltage is supplied, A trip holding part 9 which does not drive the relay driver 91 even when a polarity inversion signal or a ground signal is input; A relay driving unit 91 for driving under the control of the trip holding unit 9 to switch the relay switch 3 installed at the input side of the transformer 1 to be operated; Safety device for the transformer for neon, characterized in that consisting of. The method of claim 1, wherein the polarity inversion detection unit 5, When the input line of the transformer 1 is inverted, a pair of resistors R16 and R22 to which AC power is applied from the ground terminal of the case 2 and a voltage which is operated on by the voltages applied to the resistors R16 and R22 are operated. When the transistors Q4 and Q5 and the transistor Q5 are turned on, they operate at a voltage supplied from the first power supply 41 so that a polarity inversion signal is generated on the secondary side thereof. Safety device for a transformer for neon, characterized in that consisting of a photo coupler (Pt) to be supplied to the set control unit (8). The method of claim 1, The open signal detector 5 Sensor coils L10 and L11 wound around the leakage core of the transformer 1 to detect an open state of the transformer 1; A bridge diode 101 for rectifying and outputting an open signal sensed by the sensor coils L10 and L11; An OP-amplifier (102) for amplifying the signal output from the bridge diode (101); The output voltage of the OP-amplifier 102 is compared with the inverting terminal and compared to output 0V when the transformer 1 is in normal operation, and output a predetermined open signal as a trip signal when the transformer 1 is open. Safety device for the transformer for neon, characterized in that consisting of a portion (103). The method of claim 1, wherein the bypass / set controller 8 The timer IC 82 oscillates according to the time constant set by the resistors R37 and R43 and the capacitor C18 when the power is input, and the monostable multi outputs a high signal when the oscillation signal of the timer IC 82 is input. A transistor Q6 which is turned on by the high signal of the vibrator 83 and the monostable multivibrator 83 so that the comparison voltage of the trip holding unit 9 is supplied, Transistor Q7 for preventing the IC 82 from operating and a transistor Q9 for turning off the transistor Q7 when the polarity inversion detection signal is input through a set terminal, so that the timer IC 82 operates normally. ), A bypass switch 81 for supplying a high signal to the control terminal of the SCR Q8 by operating ON according to the user's operation, and forcing the transistor Q7 by operating ON when a high signal is input to the control terminal. Configured to SCR (Q8) to turn off Safety device for a neon transformer, characterized in that. The method of claim 1, Trip hold part 9, The comparison unit 92 compares the input voltage of the ground detection signal or the polarity inversion signal with the comparison voltage set through the bypass / set control unit 8 and outputs a high signal when the input voltage is larger as a result of the comparison. )Wow; When the high signal is output from the comparator 92, the relay driver 91 is turned on to drive the relay driver 91. When the high signal is input from the comparator 92, the transistor Q3 maintains its operating state. Neon transformer safety device.

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