CN114203518B - Electron bombardment ion source control circuit based on isolation operational amplifier and power amplifier triode - Google Patents
Electron bombardment ion source control circuit based on isolation operational amplifier and power amplifier triode Download PDFInfo
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- CN114203518B CN114203518B CN202111477244.5A CN202111477244A CN114203518B CN 114203518 B CN114203518 B CN 114203518B CN 202111477244 A CN202111477244 A CN 202111477244A CN 114203518 B CN114203518 B CN 114203518B
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- 238000002955 isolation Methods 0.000 title claims abstract description 51
- 238000001514 detection method Methods 0.000 claims abstract description 33
- 238000001819 mass spectrum Methods 0.000 abstract description 6
- 230000009471 action Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002784 hot electron Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000010884 ion-beam technique Methods 0.000 description 1
- 238000004949 mass spectrometry Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/10—Ion sources; Ion guns
- H01J49/14—Ion sources; Ion guns using particle bombardment, e.g. ionisation chambers
- H01J49/147—Ion sources; Ion guns using particle bombardment, e.g. ionisation chambers with electrons, e.g. electron impact ionisation, electron attachment
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is DC
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical & Material Sciences (AREA)
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- Power Engineering (AREA)
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- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Electron Tubes For Measurement (AREA)
Abstract
The invention provides an electron bombardment ion source control circuit based on an isolation operational amplifier and a power amplifier triode, and belongs to the technical field of mass spectrum ionization sources. The circuit comprises a main power supply input module, an EI filament voltage control module, an EI filament voltage detection module, an EI filament selection control module and an EI emission current detection module, wherein the main power supply input module provides driving voltage for the EI filament voltage control module, the EI filament voltage detection module, the EI filament selection control module and the EI emission current detection module, the EI filament voltage control module is used for controlling voltages applied to two ends of a filament, the EI filament voltage detection module is used for detecting voltages at two ends of the filament, the EI filament selection control module is used for selecting working states of the filament, and the EI emission current detection module is used for detecting conditions of electrons emitted by the filament. The circuit has stable output voltage and can effectively improve mass spectrum detection quality.
Description
Technical Field
The invention belongs to the technical field of mass spectrum ionization sources, and particularly relates to an electron bombardment ion source control circuit based on an isolation operational amplifier and a power amplifier triode.
Background
The mass spectrometer is one of the most important scientific instruments in the contemporary analysis field, has the characteristics of strong fixed capacity, high sensitivity, quick response time and the like, and has wide application in the fields of environment detection, food safety, life science and the like. The mass spectrometer mainly comprises a sample injection device, an ion source, a mass analyzer, a detector and the like, wherein the ion source is a device for ionizing sample molecules and leading out ion beam current from the sample molecules, and plays a decisive role in whether the sample can be detected. Currently, electron bombardment ion sources are one of the most widely used ion sources, and electrons are released by a hot filament and collide with sample molecules to realize ionization.
In an electron bombardment ion source, an electron emission filament is generally formed by winding a tungsten filament, current is introduced to the filament in a high vacuum environment, electrons are emitted outwards by the filament under the action of the current, hot electrons are accelerated to obtain 70eV kinetic energy under the action of a potential difference between a filament baffle and an ionization chamber wall, and electrons collide with molecules of an object to be detected in a cavity of the ionization chamber, so that the molecules of the object to be detected are ionized.
The identification of the substances depends on spectrogram matching, and the NIST database is an EI mass spectrum standard database pushed by the national institute of standards and technology, ionization is carried out on the sample by utilizing an electron bombardment ion source, and the obtained mass spectrogram is matched with the NIST standard gallery, so that the identification of sample molecules is realized. The stability of the electron emission of the ion source can affect the analysis and identification of the sample, while the stability of the power supply is the key of the stability of the electron emission of the ion source, and a stable emission current cannot be obtained by singly giving a voltage value. Most of ion source power supplies at present have unstable output voltage, which affects the repeatability of mass spectrum detection.
Disclosure of Invention
Therefore, the invention aims to provide an electron bombardment ion source control circuit based on an isolation operational amplifier and a power amplifier triode, so that the output voltage of an ion source power supply is stable, the stability of ion generation is ensured, and a spectrogram obtained by mass spectrometry has better repeatability.
The aim of the invention can be achieved by the following technical scheme: the utility model provides an electron bombardment ion source control circuit based on keep apart fortune and power amplifier triode, includes main power supply input module, EI filament voltage control module, EI filament voltage detection module, EI filament select control module and EI emission current detection module, main power supply input module provide driving voltage for EI filament voltage control module, EI filament voltage detection module, EI filament select control module, EI emission current detection module, EI filament voltage control module be used for controlling the voltage of applying at the filament both ends, EI filament voltage detection module be used for detecting the voltage at filament both ends, EI filament select control module be used for selecting the operating condition of filament, EI emission current detection module be used for detecting the condition of filament emission electron.
In the above electronic bombardment ion source control circuit based on the isolation operational amplifier and the power amplifier triode, the main power input module comprises a 24V DC power supply, a 0-100V DC adjustable power supply, a + -15V-to- + -12V power supply unit, and a GND+24V-to-FGND + -12V power supply unit.
In the above-mentioned electron bombardment ion source control circuit based on isolation operation amplifier and power amplifier triode, EI filament voltage control module include first isolation amplifier, first voltage follower and power amplifier triode, first isolation amplifier one end with main power supply input module connects, the other end links with the one end of first voltage follower, the other end of first voltage follower with the base of power amplifier triode connect, the projecting pole of power amplifier triode connect with filament selection module, the collecting electrode of power amplifier triode be connected with isolation power supply. The first voltage follower is used for forming an operational amplifying circuit with the power amplifier, and can amplify input voltage to obtain the input voltage, the input voltage is transmitted to the base electrode of the power amplifier triode without loss under the action of the subsequent voltage follower, the power amplifier triode needs to work, a voltage is applied between the collector electrode and the base electrode of the power amplifier triode, the collector electrode potential is obtained through direct coupling of an isolated power supply and the collector electrode, and under the driving of the power supply, the isolated power supply device obtains output of FGND+3.3V.
In the above electronic bombardment ion source control circuit based on the isolation operational amplifier and the power amplifier triode, a current limiting resistor is connected in series between the first voltage follower and the base electrode of the power amplifier triode. The triode can be effectively prevented from being burnt out by arranging the current limiting resistor.
In the above-mentioned electron bombardment ion source control circuit based on isolation operation amplifier and power amplifier triode, EI filament voltage detection module include second voltage follower and second isolation amplifier, the one end of second voltage follower connect in the projecting pole of power amplifier triode with EI filament select on the node between the module, the other end of second voltage follower with the input side of second isolation amplifier connect, the output side of second isolation amplifier be connected with display element, display element is used for showing the filament voltage analog signal who detects through singlechip or FPGA device conversion into digital signal.
In the above-mentioned electron bombardment ion source control circuit based on isolation operational amplifier and power amplifier triode, the EI filament selection control module includes at least two filaments, one of which is used as a working filament, the other filament is used as a spare filament, one end of the working filament is connected with a 0-100V DC adjustable power supply (as FGND, for a conventional 70eV mass spectrogram, it is taken as 70V), the other end is connected with the emitter of the power amplifier triode, its potential is equivalent to the voltage input of the base electrode of the power amplifier triode, and finally two ends of the filament obtain a voltage.
In the above electronic bombardment ion source control circuit based on the isolation operational amplifier and the power amplifier triode, the first isolation amplifier and the second isolation amplifier both adopt an isolation chip with the model of ISO124P as the core. The input and output of the isolation chip are consistent, the input and output can be isolated, and the control precision of the power supply is improved.
In the above-mentioned electron bombardment ion source control circuit based on isolation fortune is put and power amplifier triode, EI emission current detection module includes first accurate resistance, second accurate resistance, third voltage follower and fourth voltage follower, and one end after two accurate resistance are parallelly connected each other is connected between work filament and adjustable power, and the other end after two accurate resistance are parallelly connected each other is connected with first voltage follower input side, first voltage follower output side is connected with the second voltage follower, second voltage follower and singlechip are connected.
Compared with the prior art, the electron bombardment ion source control circuit based on the isolation operational amplifier and the power amplifier triode has the following advantages: through the circuit design based on isolation operational amplifier and power amplifier triode, can provide a stable operating voltage for electron bombardment ion source filament, overcome current ion source power output voltage unstable, influence mass spectrum detection's defect, in addition, still provide filament voltage detection module, real-time reaction filament both ends voltage realizes filament operating condition's control.
Drawings
Fig. 1 is a schematic block diagram of an electronic bombardment ion source control circuit based on an isolation operational amplifier and a power amplifier triode according to an embodiment.
Fig. 2 is a circuit schematic of a filament voltage control module of an embodiment.
Fig. 3 is a schematic circuit diagram of an EI emission current detection module of an embodiment.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
Referring to fig. 1, an electron bombardment ion source power supply control circuit based on isolation operational amplifier and power amplifier triode of the present embodiment at least includes: the device comprises a main power input module, an EI filament voltage control module, an EI filament voltage detection module, an EI filament selection control module and an EI emission current detection module.
The main power input module provides the power input required by other modules of the electron bombardment ion source. Preferably, the main power input module comprises a 24V DC power supply, a 0-100V DC adjustable power supply, a + -15V-to- + -12V power supply unit and a GND+24V-to-FGND + -12V power supply unit.
The EI filament voltage control module is used for controlling the voltage applied to two ends of the filament. Referring to fig. 2, the EI filament voltage control module is composed of two parts, namely an isolation operational amplifier and a power amplifier triode. The isolation operational amplifier consists of a first isolation amplifier and a first voltage follower, and provides a voltage for the base B of the power amplifier triode; the power amplifier triode plays a role in amplifying current and provides energy required by electronic thermal excitation for the filament.
For a general spectrum of EI, the electron needs to acquire energy of 70eV, preferably, FGND is 70V.
Preferably, the first voltage follower of the isolation operational amplifier is connected with the base electrode of the power amplifier triode through a current limiting resistor to prevent the triode from being burnt out.
Preferably, the electric potential at the collector C of the power amplifier triode is realized by isolating a power supply, VRB2403YMD-15WR3 type is selected, and under 24V voltage driving, output voltage (FGND+3.3V) higher than FGND3.3V is obtained, so that C, B forms an electric potential difference, and the power amplifier triode works.
The EI filament voltage detection module is used for detecting voltages at two ends of a filament.
The EI filament voltage detection module is mainly used for detecting the potential difference between the E position and the FGND end of the filament in fig. 2, and detecting the output voltage of the circuit in real time so as to monitor the working state of the filament. Consists of a second voltage follower, a second isolation amplifier and a display unit. The second voltage follower connects the E position with the second isolation amplifier to ensure the lossless transmission of the voltage at the E position. The display unit converts the analog signal output detected at E into a digital signal for display by a singlechip or an FPGA device, and in the embodiment, the singlechip is preferably adopted for processing.
The filament selection control module is used for selecting the working state of the filament. The LED lamp comprises two filaments, wherein one filament is used as a working filament, the other filament is used as a standby filament, one end of the working filament is connected with FGND, the other end of the working filament is connected with an emitter E of a power amplifier triode, and when the working filament does not work, the two ends of the working filament are connected with FGND. The voltage at E is approximately equal to the voltage at B, which can be approximated to the voltage obtained across the final filament.
It should be noted that, in this embodiment, the first isolation amplifier and the second isolation amplifier each use an isolation chip with a model number of ISO124P as a core of the circuit. The input and the output of the power supply are consistent, the input and the output can be isolated, and the control precision of the power supply can be effectively improved.
The EI emission current detection module is used to detect the situation that the filament emits electrons, as shown in fig. 3. The resistor mainly comprises a precision resistor R1, a precision resistor R2 and two voltage followers, wherein an equivalent resistance value obtained by connecting the precision resistor R1 and the precision resistor R2 in parallel is recorded as R And is combined with . The heating current of the filament is I 1 The detected emission current is I 2 ，I 2 Through the precision resistor R1 and the precision resistor R2, the voltage is converted into the voltageThe calculation formula is as follows: u (U) in ＝I 2 *R And is combined with ＝I 2 * (R1 is equal to R2/(R1+R2)), the input impedance is increased through a first-stage voltage follower, and the load capacity is improved; ensuring voltage U through a secondary voltage follower out And then outputting the stability to the singlechip for display. Finally through formula I 2 ＝(U in -U FGND )/R And is combined with Conversion to obtain the emission current I e ＝I 2 ＝(U in -U FGND ) (r1+r2)/(r1×r2) for detecting the electron emission of the filament.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (6)
1. The electron bombardment ion source control circuit based on isolation operational amplifier and power amplifier triode comprises a main power supply input module, an EI filament voltage control module, an EI filament voltage detection module, an EI filament selection control module and an EI emission current detection module, and is characterized in that the main power supply input module provides driving voltage for the EI filament voltage control module, the EI filament voltage detection module, the EI filament selection control module and the EI emission current detection module, the EI filament voltage control module is used for controlling voltages applied to two ends of a filament, the EI filament voltage detection module is used for detecting voltages at two ends of the filament, the EI filament selection control module is used for selecting working states of the filament, the EI filament emission current detection module is used for detecting conditions of electron emission of the filament, the EI filament voltage control module comprises a first isolation amplifier, a first voltage follower and a power amplifier triode, one end of the first isolation amplifier is connected with the main power supply input module, the other end of the first isolation amplifier is connected with one end of the first voltage follower, the other end of the first voltage follower is connected with the base electrode of the power amplifier triode, the emitter electrode of the power amplifier triode is connected with the filament selection module, the collector electrode of the power amplifier triode is connected with the isolation power supply, the EI filament voltage detection module comprises a second voltage follower and a second isolation amplifier, one end of the second voltage follower is connected to a node between the emitter electrode of the power amplifier triode and the EI filament selection control module, the other end of the second voltage follower is connected with the input side of the second isolation amplifier, the output side of the second isolation amplifier is connected with the display unit, the display unit is used for converting the detected filament voltage analog signals into digital signals for display through a singlechip or an FPGA device.
2. The electronic bombardment ion source control circuit based on the isolation operational amplifier and the power amplifier triode according to claim 1, wherein the main power supply input module comprises, but is not limited to, a 24VDC power supply, a 0-100VDC adjustable power supply, a + -15V-to- + -12V power supply unit, a GND+24V-to-FGND + -12V power supply unit.
3. The electronic bombardment ion source control circuit based on the isolation operational amplifier and the power amplifier triode according to claim 1 or 2, wherein a current limiting resistor is connected in series between the first voltage follower and the base electrode of the power amplifier triode.
4. The electronic bombardment ion source control circuit based on the isolation operational amplifier and the power amplifier triode according to claim 1 or 2, wherein the EI filament selection control module comprises at least two filaments, one filament is used as a working filament, the other filament is used as a standby filament, one end of the working filament is connected with an adjustable power supply of 0-100VDC, and the other end of the working filament is connected with an emitter of the power amplifier triode.
5. The electronic bombardment ion source control circuit based on the isolation operational amplifier and the power amplifier triode according to claim 1 or 2, wherein the first isolation amplifier and the second isolation amplifier both adopt an isolation chip with the model number of ISO124P as the core.
6. The electronic bombardment ion source control circuit based on the isolation operational amplifier and the power amplifier triode according to claim 1 or 2, wherein the EI emission current detection module comprises a first precise resistor, a second precise resistor, a third voltage follower and a fourth voltage follower, one end of the two precise resistors which are mutually connected in parallel is connected between a working filament and an adjustable power supply, the other end of the two precise resistors which are mutually connected in parallel is connected with the input side of the first voltage follower, the output side of the first voltage follower is connected with the second voltage follower, and the second voltage follower is connected with the singlechip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111477244.5A CN114203518B (en) | 2021-12-06 | 2021-12-06 | Electron bombardment ion source control circuit based on isolation operational amplifier and power amplifier triode |
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| CN202111477244.5A CN114203518B (en) | 2021-12-06 | 2021-12-06 | Electron bombardment ion source control circuit based on isolation operational amplifier and power amplifier triode |
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| CN114203518B true CN114203518B (en) | 2023-08-25 |
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| CN115220511B (en) * | 2022-07-14 | 2023-10-31 | 无锡卓海科技股份有限公司 | High-voltage power supply device of electron gun for detecting filament heating current and emission current |
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2021
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