Alternating current control circuit for mass spectrometer quadrupole rod

Abstract

The invention discloses an alternating current control circuit for a mass spectrometer quadrupole rod, and the circuit comprises a frequency excitation circuit which is used for outputting a first excitation signal and a second excitation signal; the negative feedback circuit is used for receiving an MASS # signal sent by an external processor so as to adjust the alternating-current voltage amplitude of the quadrupole rod; the direct current-to-alternating current circuit is used for respectively converting the positive direct current and the negative direct current into alternating current according to the received first excitation signal and the second excitation signal; the alternating-current amplifying circuit is used for respectively carrying out voltage amplification on the two paths of alternating current output by the direct-current-to-alternating-current circuit; the oscillation circuit is used for amplifying the amplified voltage again to form resonance and correspondingly outputting a first oscillation signal and a second oscillation signal; and the power supply circuit is used for connecting the quadrupole rod for power supply. According to the invention, the oscillation circuit generates resonance to obtain low-loss voltage output, and the voltage value actually required to be applied can be dynamically adjusted, so that the quadrupole rod works stably, and the service life of the circuit is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of mass spectrometry technology, specifically relating to an AC control circuit for a quadrupole mass spectrometer. Background Technology

[0002] A mass spectrometer is a highly sensitive, high-resolution, and highly specific analytical instrument used to detect the chemical composition of samples. Triple quadrupole mass spectrometers (also known as tandem quadrupole mass spectrometers) are among the mass spectrometers capable of MS / MS analysis. They are relatively simple in structure and inexpensive, thus widely used. The quadrupole, as a crucial component of the mass spectrometer, is used to improve ion transport efficiency.

[0003] Existing quadrupoles all operate on alternating current. Ions move under the force of the electric field formed by the quadrupole to achieve the purpose of ion screening. To obtain an effective ion screening function, direct current is generally input first, which needs to be converted into alternating current. However, existing technology lacks real-time control of the power supply that provides the electric field. Without real-time control of the alternating current, it is difficult to guarantee the working stability of the quadrupole and it is easy to cause damage to the internal parts of the instrument. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by proposing an AC control circuit for a quadrupole in a mass spectrometer. This circuit generates a low-loss voltage output through resonance via an oscillating circuit and can dynamically adjust the applied voltage value to ensure stable operation of the quadrupole and improve the circuit's lifespan.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] This invention proposes an AC control circuit for a quadrupole mass spectrometer, comprising a frequency excitation circuit, a negative feedback circuit, a DC-to-AC conversion circuit, an AC amplification circuit, an oscillation circuit, and a power supply circuit, wherein:

[0007] A frequency excitation circuit is used to output a first excitation signal and a second excitation signal;

[0008] The negative feedback circuit includes operational amplifier U32, capacitors C86, C92, and C93. The positive power supply terminal of operational amplifier U32 is connected to the positive terminal of the power supply and grounded through capacitor C92. The negative power supply terminal is connected to the negative terminal of the power supply and grounded through capacitor C93. The non-inverting input terminal is grounded. The inverting input terminal is used to receive the MASS# signal from the external processor to adjust the AC voltage amplitude of the quadrupole and is connected to the output terminal of operational amplifier U32 through capacitor C86. The output terminal of operational amplifier U32 also serves as the REFAIL terminal for circuit cutoff protection.

[0009] The DC-to-AC circuit has its input terminal connected to the output terminal of the operational amplifier U32, and is used to convert the positive and negative DC power into AC power respectively according to the received first excitation signal and second excitation signal.

[0010] An AC amplifier circuit is used to amplify the voltage of the two AC outputs from a DC-to-AC converter.

[0011] The oscillation circuit is used to amplify the amplified voltage again and form a resonance, and output the first oscillation signal and the second oscillation signal respectively.

[0012] The power supply circuit includes diode D9, Zener diode ZD19, diode D11, Zener diode ZD20, connector J7, and a quadrupole coil. The quadrupole coil includes a primary coil FIR1 and a secondary coil FIR2. The cathode of diode D9 is connected to the cathode of Zener diode ZD19. The anode of diode D9 is connected to the first pin of connector J7 and is used to receive the first oscillation signal. The anode of Zener diode ZD19 is connected to the second pin of connector J7. The cathode of diode D11 is connected to the cathode of Zener diode ZD20. The positive terminal of diode D11 is connected to the fourth pin of connector J7 and used to receive the second oscillation signal. The positive terminal of Zener diode ZD20 is connected to the third pin of connector J7, and the second pin of connector J7 is connected to the third pin. The first pin and the second pin of connector J7 are connected to the two ends of the primary coil FIR1, and the third pin and the fourth pin of connector J7 are connected to the two ends of the secondary coil FIR2. The primary coil FIR1 and the secondary coil FIR2 are also used to connect to a set of poles of the quadrupole, respectively.

[0013] Preferably, the frequency excitation circuit includes a DC / DC power supply chip U36, a resistor R155, a crystal oscillator X1, a resistor R270, a capacitor C68, a resistor R268, a trigger U28, a resistor R156, a capacitor C73, a switch SW2, an inverter U31, a capacitor C79, a resistor R269, a resistor R164, a capacitor C140, and a connector J3, wherein:

[0014] The power input pin of the DC / DC power chip U36 is connected to the positive terminal of the power supply. The power output pins are connected to one end of resistors R155 and R270 respectively. The ground pin is connected to 0V. The other end of resistor R270 is connected to the positive terminal of the power supply. The tri-state control pin of crystal oscillator X1 is connected to the other end of resistor R155. The power supply pin is connected to the common terminal of resistors R155 and R270, and connected to 0V through capacitor C68. The ground pin is connected to 0V. The clock output pin is connected to 0V through resistor R268. The first channel clock input clear pin and the first channel preset pin of trigger U28 are connected to the positive terminal of the power supply. The data input pin is connected to the first channel inverted output pin. The first channel clock input pin is connected to the clock output pin of crystal oscillator X1. The first channel positive output pin is connected to the moving contact of switch SW2 through resistor R156. The ground pin is connected to 0V voltage. The second channel inverted output pin is connected to the second channel data input pin and outputs the second excitation signal. The first channel positive output pin outputs the first excitation signal. The second channel preset pin, the second channel clock input clear pin, and the power supply pin are connected to each other and connected to the positive terminal of the power supply. They are also connected to 0V voltage through capacitor C73. The second channel clock input pin is connected to the moving contact of switch SW2.

[0015] The signal input pins of inverter U31 are connected to one end of capacitor C140, resistor R269, and resistor R164, respectively. The signal output pin is connected to the stationary contact of switch SW2. The ground pin is connected to 0V. The power supply positive pin is connected to the power supply positive terminal and to the other end of resistor R269. The two pins of connector J3 are grounded and connected to the other end of capacitor C140, respectively. The two ends of capacitor C79 are connected to 0V and the power supply positive pin of inverter U31, respectively. The other end of resistor R164 is connected to the ground pin of inverter U31.

[0016] Preferably, the DC-to-AC circuit includes resistors R179, R173, and R184, potentiometer VR10, resistor R125, NPN transistor Q2, diode D6, resistor R56, capacitor C85, NPN transistor Q7, diode D12, resistor R57, capacitor C99, and a four-channel analog switch U30. One end of resistor R179 is connected to the output terminal of operational amplifier U32, and the other end is connected to one end of resistors R173 and R184 respectively. The signal output pin of potentiometer VR10 is connected to the negative terminal of the power supply through resistor R125. The positive terminal pin of the power supply is connected to the other end of resistor R173, and the negative terminal pin of the power supply is connected to the other end of resistor R184. The collector of NPN transistor Q2 is connected to the positive terminal of the power supply, the emitter is connected to the anode of diode D6, and the base is connected to the positive terminal pin of potentiometer VR10. The collector of NPN transistor Q7 is connected to... Connect the positive terminal of the power supply, connect the emitter to the positive terminal of diode D12, and connect the base to the negative terminal of potentiometer VR10. Pins 1 and 16 of the four-channel analog switch U30 are used to receive the first excitation signal, and pins 8 and 9 are used to receive the second excitation signal. One end of resistor R56 and capacitor C85 are connected to the negative terminal of diode D6 and pin 2 of the four-channel analog switch U30, and the other end is connected to the negative terminal of the power supply and pin 6 of the four-channel analog switch U30. One end of resistor R57 and capacitor C99 are connected to the negative terminal of diode D12 and pin 10 of the four-channel analog switch U30, and the other end is connected to the negative terminal of the power supply and pin 14 of the four-channel analog switch U30. Pins 3 and 7 of the four-channel analog switch U30 are interconnected, and pins 11 and 15 are interconnected. Pins 3 and 11 of the four-channel analog switch U30 are also connected to the AC amplifier circuit.

[0017] Preferably, the AC control circuit for the quadrupole of the mass spectrometer further includes a rectifier bridge circuit. The rectifier bridge circuit includes diode group D8, capacitor C151, inductor L4, capacitor C87, resistor R176, capacitor C84, capacitor C88, diode group D13, capacitor C152, inductor L5, capacitor C100, resistor R202, capacitor C98, and capacitor C101. Diode group D8 includes a first Schottky diode and a second Schottky diode. The anode of the first Schottky diode is connected to the cathode of the second Schottky diode and the third pin of the four-way analog switch U30. One end of inductor L4 is connected to the cathode of the first Schottky diode and the anode of the second Schottky diode, and is connected to 0V through capacitor C151. The other end of inductor L4 is connected to resistor R176, capacitor C84, and capacitor C88 in sequence. The circuit is connected to a 0V voltage via capacitor C87. Diode group D13 includes a third Schottky diode and a fourth Schottky diode. The anode of the third Schottky diode is connected to the cathode of the fourth Schottky diode and the eleventh pin of the four-way analog switch U30. One end of inductor L5 is connected to the cathode of the third Schottky diode and the anode of the fourth Schottky diode, and is connected to a 0V voltage via capacitor C152. The other end of inductor L5 is connected to a 0V voltage via resistor R202, capacitor C98, and capacitor C101, and is connected to a 0V voltage via capacitor C100. The common terminal of capacitors C84 and C88 is also connected to the positive input terminal of the AC amplifier circuit as the non-inverting output terminal of the rectifier bridge circuit. Capacitors C98 and C101 are also connected to the negative input terminal of the AC amplifier circuit as the inverting output terminal of the rectifier bridge circuit.

[0018] Preferably, the AC amplifier circuit includes a first push-pull circuit, a second push-pull circuit, a third push-pull circuit, and a fourth push-pull circuit, wherein:

[0019] The first push-pull circuit includes resistors R171, R180, and R186, an NPN transistor Q5, and a capacitor C82. The base of the NPN transistor Q5 is connected to the common terminal of capacitors C84 and C88. The collector is connected to the positive terminal of the power supply and is connected to 0V through capacitor C82. The emitter is connected to 0V through resistor R186. The two ends of resistor R171 are connected to the base and collector of the NPN transistor Q5, respectively. The two ends of resistor R180 are connected to the base of the NPN transistor Q5 and the 0V terminal of resistor R186, respectively. The common terminal of resistors R171 and R180 serves as the positive input terminal of the AC amplifier circuit.

[0020] The second push-pull circuit includes resistors R200, R205, and R209, an NPN transistor Q9, and a capacitor C95. The base of the NPN transistor Q9 is connected to the common terminal of capacitors C98 and C101. The collector is connected to the positive terminal of the power supply and is connected to 0V through capacitor C95. The emitter is connected to 0V through resistor R209. The two ends of resistor R200 are connected to the base and collector of the NPN transistor Q9, respectively. The two ends of resistor R205 are connected to the base of the NPN transistor Q9 and the 0V terminal of resistor R209, respectively. The common terminal of resistors R200 and R205 serves as the negative input terminal of the AC amplifier circuit.

[0021] The third push-pull circuit includes capacitors C80 and C91, diodes D5, D7, and D10, resistors R165, R189, R166, and R177, NPN transistor Q1, PNP transistor Q6, capacitors C83 and C149. One end of capacitors C80 and C91 is connected to the emitter of NPN transistor Q5. The base of NPN transistor Q1 is connected to the other end of capacitor C80 and the anode of diode D5. The collector is connected to the positive terminal of the power supply and then to 0V through capacitor C149. The emitter is connected to resistor R1... 66 is connected to one end of capacitor C83. The two ends of resistor R165 are connected to the base and collector of NPN transistor Q1, respectively. The emitter of PNP transistor Q6 is connected to the common terminal of resistor R166 and capacitor C83 through resistor R177. The base is connected to the other end of capacitor C91 and the negative terminal of diode D10, respectively. The collector is connected to 0V. Diodes D5, D7 and D10 are connected in series in the same direction. The two ends of resistor R189 are connected to the base and collector of PNP transistor Q6, respectively. The other end of capacitor C83 serves as the positive output terminal of AC amplifier circuit.

[0022] The fourth push-pull circuit includes capacitors C94 and C109, diodes D14, D16, and D17, resistors R194, R216, R204, and R211, an NPN transistor Q8, a PNP transistor Q12, capacitors C102 and C150. One end of each capacitor (C94 or C109) is connected to the emitter of NPN transistor Q9. The base of NPN transistor Q8 is connected to the other end of capacitor C94 and the anode of diode D14. The collector is connected to 0V, and the emitter is connected to one end of capacitor C102 through resistor R204. The two ends of resistor R194 are connected to the base and collector of NPN transistor Q8, respectively. The emitter of PNP transistor Q12 is connected to the common terminal of resistor R204 and capacitor C102 through resistor R211. The base is connected to the other end of capacitor C109 and the cathode of diode D17. The collector is connected to the negative terminal of the power supply and connected to 0V through capacitor C150. Diodes D14, D16 and D17 are connected in series in the same direction. The two ends of resistor R216 are connected to the base and collector of PNP transistor Q12, respectively. The other end of capacitor C102 serves as the negative output terminal of the AC amplifier circuit.

[0023] Preferably, the oscillation circuit includes a bias circuit, a first transformer excitation circuit, and a second transformer excitation circuit, wherein:

[0024] The bias circuit includes resistors R174 and R199, potentiometers VR4 and VR6, resistor R210, capacitor C148, resistor R213, capacitor C110, and Zener diode ZD25. The two ends of resistor R174 are connected to one end of resistor R199 and the positive output terminal of the AC amplifier circuit, respectively. The two ends of capacitor C148 are connected to the other end of resistor R199 and the negative power supply pin of potentiometer VR6, respectively. The signal output pin of potentiometer VR4 is connected to the common terminal of resistors R174 and R199, and the positive power supply pin is connected to potentiometer V... The positive power supply pin of R6 is connected, the negative terminal of the Zener diode ZD25 is connected to the positive power supply through resistor R213, capacitor C110 is connected in parallel with the Zener diode ZD25, and the negative terminal of the Zener diode ZD25 is also connected to the positive power supply pin of potentiometer VR6, and the positive terminal is connected to the negative power supply pin of potentiometer VR6. The negative power supply pins of potentiometers VR4 and VR6 are both connected to 0V. The signal output pin of potentiometer VR6 is connected to the common terminal of resistor R199 and capacitor C148, and is connected to the other end of capacitor C102 through resistor R210.

[0025] The first transformer excitation circuit includes resistor R169, N-channel power MOSFET Q3, Zener diodes ZD15 and ZD16, capacitor C89, resistors R182 and R170, N-channel power MOSFET Q4, Zener diodes ZD17 and ZD18, capacitor C90, and resistor R183. The gate of N-channel power MOSFET Q3 is connected to the positive output terminal of the AC amplifier circuit through resistor R169, its drain is connected to the drain of N-channel power MOSFET Q4, and its source is connected to the negative terminal of Zener diode ZD16. Zener diodes ZD15 and ZD16 are connected in series in reverse, and the voltage across Zener diode ZD15 is... The negative terminals are connected to the positive output of the AC amplifier circuit and the negative terminal of Zener diode ZD17, respectively. Capacitor C89 and resistor R182 are connected in parallel, and their two ends are connected to the negative terminal of Zener diode ZD16 and ground, respectively. The gate of N-channel power MOSFET Q4 is connected to the negative terminal of Zener diode ZD17 through resistor R170. The drain also serves as the positive output of the oscillation circuit, outputting the first oscillation signal and is connected to the positive terminal of diode D9. The source is connected to the negative terminal of Zener diode ZD18. Zener diodes ZD17 and ZD18 are connected in series in reverse. Capacitor C90 and resistor R183 are connected in parallel, and their two ends are connected to the negative terminal of Zener diode ZD18 and ground, respectively. The second transformer... The excitation circuit includes resistor R207, N-channel power MOSFET Q10, Zener diodes ZD21 and ZD22, capacitor C107, resistors R214 and R208, N-channel power MOSFET Q11, Zener diodes ZD23 and ZD24, capacitor C108, and resistor R215. The gate of N-channel power MOSFET Q10 is connected to the negative output terminal of the AC amplifier circuit through resistor R207, its drain is connected to the drain of N-channel power MOSFET Q11, and its source is connected to the negative terminal of Zener diode ZD22. Zener diodes ZD21 and ZD22 are connected in series in reverse order, and Zener diode ZD21... The negative terminals of the capacitors are connected to the negative output terminal of the AC amplifier circuit and the negative terminal of the Zener diode ZD23, respectively. The capacitor C107 and resistor R214 are connected in parallel, and their two ends are connected to the negative terminal of the Zener diode ZD22 and ground, respectively. The gate of the N-channel power MOSFET Q11 is connected to the negative terminal of the Zener diode ZD23 through resistor R208. The drain also serves as the negative output terminal of the oscillation circuit, outputting the second oscillation signal and is connected to the positive terminal of the diode D11. The source is connected to the negative terminal of the Zener diode ZD24. The Zener diodes ZD23 and ZD24 are connected in series in reverse. The capacitor C108 and resistor R215 are connected in parallel, and their two ends are connected to the negative terminal of the Zener diode ZD24 and ground, respectively.

[0026] Preferably, the AC control circuit for the quadrupole of the mass spectrometer further includes an adjustment circuit, which comprises a common-mode inductor L6, a high-voltage power supply circuit, a high-voltage loop circuit, a loss current feedback circuit, and a first filter circuit, wherein:

[0027] The first and second pins of the common-mode inductor L6 form the first winding, the third and fourth pins form the second winding, and the fourth pin of the common-mode inductor L6 is grounded through the first filter circuit and connected to the second pin of the connector J7.

[0028] The high-voltage power supply circuit includes capacitor C96, capacitor C97, diode D15, relay RL1, connector JP1, diode D21, resistors R30, R29, R275, and NPN transistor Q17. The third pin of common-mode inductor L6 is connected to the cathode of diode D15 and connected to 0V via parallel capacitors C96 and C97. The first pin of relay RL1 is connected to the positive terminal of the power supply and the cathode of diode D21. The second pin is connected to the anode of diode D21 and one end of resistor R30. The seventh pin is connected to the cathode of diode D15. The collector of NPN transistor Q17 is connected to the other end of resistor R30, the emitter is connected to 0V, and the base is connected to the RF_PWR terminal via resistor R29 for external high voltage. The two ends of resistor R275 are connected to the base and emitter of NPN transistor Q17 respectively. The two pins of connector JP1 are connected to the sixth and eighth pins of relay RL1 respectively, and the sixth and fifth pins and the seventh and eighth pins of relay RL1 are connected. The sixth pin of relay RL1 also serves as the RF+ terminal for external 96V positive terminal access.

[0029] The high-voltage circuit includes capacitors C103 and C104. The second pin of the common-mode inductor L6 is connected to 0V through the parallel capacitors C103 and C104, and serves as the RF terminal for external 96V negative terminal connection.

[0030] The loss current feedback circuit includes resistors R219, R217, and R75, capacitor C137, and connector J2. The first pin of the common-mode inductor L6 is grounded through the parallel resistors R219 and R217 and serves as the RFI terminal for measuring the energy loss of the circuit operation. The first pin of the common-mode inductor L6 is also grounded through resistor R75 and capacitor C137 in sequence. The two pins of connector J2 are connected to ground and the common terminal of resistor R75 and capacitor C137, respectively.

[0031] Preferably, the first filter circuit includes electrolytic capacitors CE3, CE4, C105, and C106. The positive terminals of electrolytic capacitors CE3 and CE4, one end of capacitor C105, and one end of capacitor C106 are all connected to the fourth pin of common-mode inductor L6. The negative terminals of electrolytic capacitors CE3 and CE4, the other end of capacitor C105, and the other end of capacitor C106 are all grounded.

[0032] Preferably, the adjustment circuit further includes an indicator circuit, which includes resistors R206 and R212 and a light-emitting diode LED1. The fourth pin of the common-mode inductor L6 is connected to the positive terminal of the light-emitting diode LED1 in sequence through resistors R206 and R212, and the negative terminal of the light-emitting diode LED1 is grounded.

[0033] Preferably, the negative feedback circuit further includes resistor R168, capacitor C81, resistor R167, and resistor R172. Resistor R167 and resistor R172 are connected in parallel, with one end connected to the inverting input terminal of operational amplifier U32, and the other end connected to one end of resistor R168 and connected to 0V voltage through capacitor C81. The other end of resistor R168 is connected to the processor to receive the MASS# signal.

[0034] Preferably, the AC control circuit for the quadrupole of the mass spectrometer further includes a first debugging circuit, which includes resistors R175, R178, and R181. The processor sends a first fine-tuning signal Co, a second fine-tuning signal Be, and an enable signal RFRESET. The first fine-tuning signal Co, the second fine-tuning signal Be, and the enable signal RFRESET are sequentially input to the inverting input terminal of the operational amplifier U32 through resistors R175, R178, and R181 to achieve fine-tuning of the MASS# signal.

[0035] Preferably, the AC control circuit for the mass spectrometer quadrupole further includes a second debugging circuit, which includes resistors R185, R187, R190, R191, R274, R193, R192, R195, R196, R197, R198, R203, a potentiometer VR3, an encoder rotary switch SW1, and a connector J9, wherein:

[0036] The signal output pin of potentiometer VR3 is connected to one end of resistor R185. The positive power supply pin is connected to pin C of encoder rotary switch SW1, and the negative power supply pin is connected to 0V. Pin C of encoder rotary switch SW1 also serves as the RRF terminal, used to connect the AC voltage of the actual output quadrupole to form a closed-loop control. It is connected to one end of resistor R187 and the first pin of connector J9. The first pin of encoder rotary switch SW1 is connected to one end of resistor R193. The second pin is connected to one end of resistor R274 through resistor R192. The fourth pin is connected to one end of resistor R191. The eighth pin is connected to resistor R1... One end of resistor R185, R187, R190, R191, R274, and R193 are connected to the inverting input of operational amplifier U32. The first, second, fourth, and eighth pins of encoder rotary switch SW1 are also connected to the second pin of connector J9 via resistors R195, R196, R197, and R198, respectively. One end of resistor R203 is connected to the second pin of connector J9 and serves as the RRFRTN1 terminal to provide a reference level. The other end is connected to the third pin of connector J9 and connected to 0V.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] 1) This circuit can determine the oscillation frequency of the circuit through the frequency excitation circuit, and split the DC current into two paths, one high and one low, through the negative feedback circuit, DC to AC circuit, AC amplifier circuit and oscillation circuit. At the same time, it amplifies the DC current stage by stage. A 96V voltage is applied to one end of the primary coil, and the other end is switched at a preset frequency through the switching transistor, so that the current in the primary coil changes accordingly with time. At the same time, the secondary coil generates an induced electromotive force and forms a voltage difference according to the turns ratio. The oscillation circuit has the minimum loss at resonance.

[0039] 2) The voltage applied to the primary coil is adjusted by regulating the current through the common-mode coil, thereby achieving resonance adjustment. After successful tuning, the circuit operates normally to generate alternating current. When the current at the common-mode coil is too large, the tuning is unsuccessful. When the circuit loss is very large (i.e., the current is very large), the circuit will be turned off through the enable signal RFRESET. At this time, the primary coil stops working, thus protecting the circuit and the instrument. The current flowing through the common-mode inductor L6 is used to visually indicate whether the resonance state has been reached. It can also apply 96V voltage to the quadrupole coil through the common-mode inductor. The other set of inductors of the common-mode inductor simultaneously generates current, which can measure the operating energy loss of the circuit for real-time monitoring.

[0040] 3) The negative feedback circuit, the first debugging circuit, and the second debugging circuit combine all the control signals (MASS#, Co, Be, RFRESET, RRF) to form the input signal of the circuit. The operational amplifier U32 dynamically adjusts the excitation signals required by the intermediate amplifier circuits, so that the transformer with 96V voltage works to obtain the final AC power and apply it to the two poles of the quadrupole. This makes it easy to control the amplitude of the AC output and realize closed-loop control based on the actual AC voltage of the quadrupole. Attached Figure Description

[0041] Figure 1 This is a circuit block diagram of the AC control circuit for a quadrupole mass spectrometer according to the present invention;

[0042] Figure 2 This is a circuit diagram of the frequency excitation circuit of the present invention;

[0043] Figure 3 This is a circuit diagram of the negative feedback circuit, the first debugging circuit, and the second debugging circuit of the present invention;

[0044] Figure 4 This is a circuit diagram of the DC-to-AC converter circuit and the rectifier bridge circuit of the present invention;

[0045] Figure 5 This is a circuit diagram of the AC amplifier circuit of the present invention;

[0046] Figure 6 This is a circuit diagram of the oscillation circuit of the present invention;

[0047] Figure 7 This is a circuit diagram of the regulating circuit of the present invention. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] It should be noted that when a component is referred to as being "connected" to another component, it can be directly connected to the other component or there may be an intervening component. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application.

[0050] like Figure 1-7As shown, an AC control circuit for a quadrupole mass spectrometer includes a frequency excitation circuit, a negative feedback circuit, a DC-to-AC conversion circuit, an AC amplifier circuit, an oscillation circuit, and a power supply circuit, wherein:

[0051] A frequency excitation circuit is used to output a first excitation signal and a second excitation signal;

[0052] The negative feedback circuit includes operational amplifier U32, capacitors C86, C92, and C93. The positive power supply terminal of operational amplifier U32 is connected to the positive terminal of the power supply and grounded through capacitor C92. The negative power supply terminal is connected to the negative terminal of the power supply and grounded through capacitor C93. The non-inverting input terminal is grounded. The inverting input terminal is used to receive the MASS# signal from the external processor to adjust the AC voltage amplitude of the quadrupole and is connected to the output terminal of operational amplifier U32 through capacitor C86. The output terminal of operational amplifier U32 also serves as the REFAIL terminal for circuit cutoff protection.

[0053] The DC-to-AC circuit has its input terminal connected to the output terminal of the operational amplifier U32, and is used to convert the positive and negative DC power into AC power respectively according to the received first excitation signal and second excitation signal.

[0054] An AC amplifier circuit is used to amplify the voltage of the two AC outputs from a DC-to-AC converter.

[0055] The oscillation circuit is used to amplify the amplified voltage again and form a resonance, and output the first oscillation signal and the second oscillation signal respectively.

[0056] The power supply circuit includes diode D9, Zener diode ZD19, diode D11, Zener diode ZD20, connector J7, and a quadrupole coil. The quadrupole coil includes a primary coil FIR1 and a secondary coil FIR2. The cathode of diode D9 is connected to the cathode of Zener diode ZD19. The anode of diode D9 is connected to the first pin of connector J7 and is used to receive the first oscillation signal. The anode of Zener diode ZD19 is connected to the second pin of connector J7. The cathode of diode D11 is connected to the cathode of Zener diode ZD20. The positive terminal of diode D11 is connected to the fourth pin of connector J7 and used to receive the second oscillation signal. The positive terminal of Zener diode ZD20 is connected to the third pin of connector J7, and the second pin of connector J7 is connected to the third pin. The first pin and the second pin of connector J7 are connected to the two ends of the primary coil FIR1, and the third pin and the fourth pin of connector J7 are connected to the two ends of the secondary coil FIR2. The primary coil FIR1 and the secondary coil FIR2 are also used to connect to a set of poles of the quadrupole, respectively.

[0057] In this circuit, the first excitation signal 2M CLK and the second excitation signal 2M CLK# are both sinusoidal signals with the same frequency and a 180° phase difference, such as both being 2MHz sinusoidal signals. The operational amplifier U32 in the negative feedback circuit has capacitors C92 and C93 connected to its positive and negative power supply terminals, respectively. Capacitors C92 and C93 are decoupling capacitors. The positive and negative power supply terminals determine the output range of operational amplifier U32. Adding decoupling capacitors is to filter out interference from other components, reducing source impedance, power supply noise, and increasing the stability of the operational amplifier. In the quadrupole DIAGRAM, the primary coil FIR1 and the secondary coil FIR2 have a turns ratio of 2:37 and are wound in opposite directions. The primary coil FIR1 is connected to one set of poles of the quadrupole (e.g., a diagonally opposite set of poles), and the secondary coil FIR2 is connected to another set of poles of the quadrupole (e.g., a diagonally opposite set of poles). Each set of poles is subjected to opposite voltages. Specifically, Figure 7 The RF+ and RF- terminals are connected one-to-one with a pair of diagonally opposite poles on the quadrupole to apply an AC voltage of opposite polarity to the quadrupole. The DC+ and DC- terminals are connected one-to-one with another pair of diagonally opposite poles on the quadrupole to apply a DC voltage of opposite polarity to the quadrupole. Figure 7 The RF+ terminal is also used for external 96V positive connection, and the RF- terminal is used for external 96V negative connection. Operational amplifier U32 is model OPA197IDR, and connector J7 is model A3963WV-4P. The oscillation circuit further amplifies the amplified voltage and matches it to the LC parameters of the back-end adjustment circuit to achieve LC resonance, thereby generating AC oscillation as a signal source. The external processor can be a server, computer, etc.

[0058] Specifically, the positive voltage of the power supply in the frequency excitation circuit is +5V, while the positive voltage of the power supply in other circuits is +15V, and the negative voltage is -15V. The TPn indicator in each diagram represents the nth test point, where n is a positive integer, such as TP30 (PHASE1 represents the first excitation signal 2MCLK being tested), TP31 (PHASE2 represents the second excitation signal 2MCLK# being tested), and so on. All 0V voltage connections are also grounded through resistor R218.

[0059] In one embodiment, the frequency excitation circuit includes a DC / DC power supply chip U36, a resistor R155, a crystal oscillator X1, a resistor R270, a capacitor C68, a resistor R268, a trigger U28, a resistor R156, a capacitor C73, a switch SW2, an inverter U31, a capacitor C79, a resistor R269, a resistor R164, a capacitor C140, and a connector J3, wherein:

[0060] The power input pin of the DC / DC power chip U36 is connected to the positive terminal of the power supply. The power output pins are connected to one end of resistors R155 and R270 respectively. The ground pin is connected to 0V. The other end of resistor R270 is connected to the positive terminal of the power supply. The tri-state control pin of crystal oscillator X1 is connected to the other end of resistor R155. The power supply pin is connected to the common terminal of resistors R155 and R270, and connected to 0V through capacitor C68. The ground pin is connected to 0V. The clock output pin is connected to 0V through resistor R268. The first channel clock input clear pin and the first channel preset pin of trigger U28 are connected to the positive terminal of the power supply. The data input pin is connected to the first channel inverted output pin. The first channel clock input pin is connected to the clock output pin of crystal oscillator X1. The first channel positive output pin is connected to the moving contact of switch SW2 through resistor R156. The ground pin is connected to 0V voltage. The second channel inverted output pin is connected to the second channel data input pin and outputs the second excitation signal. The first channel positive output pin outputs the first excitation signal. The second channel preset pin, the second channel clock input clear pin, and the power supply pin are connected to each other and connected to the positive terminal of the power supply. They are also connected to 0V voltage through capacitor C73. The second channel clock input pin is connected to the moving contact of switch SW2.

[0061] The signal input pins of inverter U31 are connected to one end of capacitor C140, resistor R269, and resistor R164, respectively. The signal output pin is connected to the stationary contact of switch SW2. The ground pin is connected to 0V. The power supply positive pin is connected to the power supply positive terminal and to the other end of resistor R269. The two pins of connector J3 are grounded and connected to the other end of capacitor C140, respectively. The two ends of capacitor C79 are connected to 0V and the power supply positive pin of inverter U31, respectively. The other end of resistor R164 is connected to the ground pin of inverter U31.

[0062] The frequency excitation circuit outputs a first excitation signal 2M CLK and a second excitation signal 2M CLK#. Both signals are sinusoidal, have the same frequency, and are 180° out of phase, which determines the circuit's oscillation frequency. Figure 2 As shown, the frequency excitation circuit also includes capacitors C138 and C139. Capacitor C139 is connected in series between the power input pin and the ground pin of the DC / DC power chip U36, and capacitor C138 is connected in series between the power output pin and the ground pin of the DC / DC power chip U36 for filtering. The flip-flop U28 is model SN74HC74DR, the inverter U31 is model LVC1G14, the switch SW2 is model CHS-01B, and the connector J3 is model B2B-XHA.

[0063] In one embodiment, the DC-to-AC circuit includes resistors R179, R173, and R184, potentiometer VR10, resistor R125, NPN transistor Q2, diode D6, resistor R56, capacitor C85, NPN transistor Q7, diode D12, resistor R57, capacitor C99, and a four-channel analog switch U30. One end of resistor R179 is connected to the output terminal of operational amplifier U32, and the other end is connected to one end of resistors R173 and R184 respectively. The signal output pin of potentiometer VR10 is connected to the negative terminal of the power supply through resistor R125. The positive terminal pin of the power supply is connected to the other end of resistor R173, and the negative terminal pin of the power supply is connected to the other end of resistor R184. The collector of NPN transistor Q2 is connected to the positive terminal of the power supply, the emitter is connected to the anode of diode D6, and the base is connected to the positive terminal pin of potentiometer VR10. The collector of NPN transistor Q7... The emitter is connected to the positive terminal of the power supply, the base is connected to the negative terminal of the power supply of potentiometer VR10, the first and sixteenth pins of the four-channel analog switch U30 are used to receive the first excitation signal, and the eighth and ninth pins are used to receive the second excitation signal. One end of resistor R56 and capacitor C85 is connected to the negative terminal of diode D6 and the second pin of the four-channel analog switch U30, and the other end is connected to the negative terminal of the power supply and the sixth pin of the four-channel analog switch U30. One end of resistor R57 and capacitor C99 is connected to the negative terminal of diode D12 and the tenth pin of the four-channel analog switch U30, and the other end is connected to the negative terminal of the power supply and the fourteenth pin of the four-channel analog switch U30. The third and seventh pins of the four-channel analog switch U30 are interconnected, and the eleventh and fifteenth pins are interconnected. The third and eleventh pins of the four-channel analog switch U30 are also connected to the AC amplifier circuit.

[0064] The DC-to-AC circuit converts positive and negative DC power into AC power based on the received first excitation signal 2MCLK and second excitation signal 2MCLK#, achieved by continuously switching four analog switches U30 at a speed of 2M. Figure 4 As shown, the four-channel analog switch U30 consists of four parts: U30B, U30C, U30D, and U30E. The selected model is DG411DY, but it can also be replaced by other models of four-channel analog switches in existing technology. Diodes D6 and D12 are selected as 1N4148W. NPN transistors Q2 and Q7 are selected as MMBT3904.

[0065] In one embodiment, the AC control circuit for the quadrupole of the mass spectrometer further includes a rectifier bridge circuit. The rectifier bridge circuit includes diode group D8, capacitor C151, inductor L4, capacitor C87, resistor R176, capacitor C84, capacitor C88, diode group D13, capacitor C152, inductor L5, capacitor C100, resistor R202, capacitor C98, and capacitor C101. Diode group D8 includes a first Schottky diode and a second Schottky diode. The anode of the first Schottky diode is connected to the cathode of the second Schottky diode and the third pin of the four-way analog switch U30. One end of inductor L4 is connected to the cathode of the first Schottky diode and the anode of the second Schottky diode, and is connected to 0V through capacitor C151. The other end of inductor L4 is connected sequentially through resistor R176, capacitor C84, and capacitor C87. Pin 8 is connected to 0V, and is also connected to 0V through capacitor C87. Diode group D13 includes a third Schottky diode and a fourth Schottky diode. The anode of the third Schottky diode is connected to the cathode of the fourth Schottky diode and the eleventh pin of the four-way analog switch U30. One end of inductor L5 is connected to the cathode of the third Schottky diode and the anode of the fourth Schottky diode, and is connected to 0V through capacitor C152. The other end of inductor L5 is connected to 0V through resistor R202, capacitor C98 and capacitor C101 in sequence, and is connected to 0V through capacitor C100. The common terminal of capacitors C84 and C88 is also connected to the positive input terminal of the AC amplifier circuit as the non-inverting output terminal of the rectifier bridge circuit. Capacitors C98 and C101 are also connected to the negative input terminal of the AC amplifier circuit as the inverting output terminal of the rectifier bridge circuit.

[0066] Among them, diode group D8 and diode group D13 are selected as BAS40-04, but can also be replaced with other models known to those skilled in the art.

[0067] In one embodiment, the AC amplifier circuit includes a first push-pull circuit, a second push-pull circuit, a third push-pull circuit, and a fourth push-pull circuit, wherein:

[0068] The first push-pull circuit includes resistors R171, R180, and R186, an NPN transistor Q5, and a capacitor C82. The base of the NPN transistor Q5 is connected to the common terminal of capacitors C84 and C88. The collector is connected to the positive terminal of the power supply and is connected to 0V through capacitor C82. The emitter is connected to 0V through resistor R186. The two ends of resistor R171 are connected to the base and collector of the NPN transistor Q5, respectively. The two ends of resistor R180 are connected to the base of the NPN transistor Q5 and the 0V terminal of resistor R186, respectively. The common terminal of resistors R171 and R180 serves as the positive input terminal of the AC amplifier circuit.

[0069] The second push-pull circuit includes resistors R200, R205, and R209, an NPN transistor Q9, and a capacitor C95. The base of the NPN transistor Q9 is connected to the common terminal of capacitors C98 and C101. The collector is connected to the positive terminal of the power supply and is connected to 0V through capacitor C95. The emitter is connected to 0V through resistor R209. The two ends of resistor R200 are connected to the base and collector of the NPN transistor Q9, respectively. The two ends of resistor R205 are connected to the base of the NPN transistor Q9 and the 0V terminal of resistor R209, respectively. The common terminal of resistors R200 and R205 serves as the negative input terminal of the AC amplifier circuit.

[0070] The third push-pull circuit includes capacitors C80 and C91, diodes D5, D7, and D10, resistors R165, R189, R166, and R177, NPN transistor Q1, PNP transistor Q6, capacitors C83 and C149. One end of capacitors C80 and C91 is connected to the emitter of NPN transistor Q5. The base of NPN transistor Q1 is connected to the other end of capacitor C80 and the anode of diode D5. The collector is connected to the positive terminal of the power supply and then to 0V through capacitor C149. The emitter is connected to resistor R1... 66 is connected to one end of capacitor C83. The two ends of resistor R165 are connected to the base and collector of NPN transistor Q1, respectively. The emitter of PNP transistor Q6 is connected to the common terminal of resistor R166 and capacitor C83 through resistor R177. The base is connected to the other end of capacitor C91 and the negative terminal of diode D10, respectively. The collector is connected to 0V. Diodes D5, D7 and D10 are connected in series in the same direction. The two ends of resistor R189 are connected to the base and collector of PNP transistor Q6, respectively. The other end of capacitor C83 serves as the positive output terminal of AC amplifier circuit.

[0071] The fourth push-pull circuit includes capacitors C94 and C109, diodes D14, D16, and D17, resistors R194, R216, R204, and R211, an NPN transistor Q8, a PNP transistor Q12, capacitors C102 and C150. One end of each capacitor (C94 or C109) is connected to the emitter of NPN transistor Q9. The base of NPN transistor Q8 is connected to the other end of capacitor C94 and the anode of diode D14. The collector is connected to 0V, and the emitter is connected to one end of capacitor C102 through resistor R204. The two ends of resistor R194 are connected to the base and collector of NPN transistor Q8, respectively. The emitter of PNP transistor Q12 is connected to the common terminal of resistor R204 and capacitor C102 through resistor R211. The base is connected to the other end of capacitor C109 and the cathode of diode D17. The collector is connected to the negative terminal of the power supply and connected to 0V through capacitor C150. Diodes D14, D16 and D17 are connected in series in the same direction. The two ends of resistor R216 are connected to the base and collector of PNP transistor Q12, respectively. The other end of capacitor C102 serves as the negative output terminal of the AC amplifier circuit.

[0072] Among them, NPN transistors Q1, Q5, Q6, Q8, Q9 and Q12 are selected as FZI753TA, and diodes D5, D7, D10, D14, D16 and D17 are selected as S1A, or can be replaced with other models well known to those skilled in the art.

[0073] In one embodiment, the oscillation circuit includes a bias circuit, a first transformer excitation circuit, and a second transformer excitation circuit, wherein:

[0074] The bias circuit includes resistors R174 and R199, potentiometers VR4 and VR6, resistor R210, capacitor C148, resistor R213, capacitor C110, and Zener diode ZD25. The two ends of resistor R174 are connected to one end of resistor R199 and the positive output terminal of the AC amplifier circuit, respectively. The two ends of capacitor C148 are connected to the other end of resistor R199 and the negative power supply pin of potentiometer VR6, respectively. The signal output pin of potentiometer VR4 is connected to the common terminal of resistors R174 and R199, and the positive power supply pin is connected to potentiometer V... The positive power supply pin of R6 is connected, the negative terminal of the Zener diode ZD25 is connected to the positive power supply through resistor R213, capacitor C110 is connected in parallel with the Zener diode ZD25, and the negative terminal of the Zener diode ZD25 is also connected to the positive power supply pin of potentiometer VR6, and the positive terminal is connected to the negative power supply pin of potentiometer VR6. The negative power supply pins of potentiometers VR4 and VR6 are both connected to 0V. The signal output pin of potentiometer VR6 is connected to the common terminal of resistor R199 and capacitor C148, and is connected to the other end of capacitor C102 through resistor R210.

[0075] The first transformer excitation circuit includes resistor R169, N-channel power MOSFET Q3, Zener diodes ZD15 and ZD16, capacitor C89, resistors R182 and R170, N-channel power MOSFET Q4, Zener diodes ZD17 and ZD18, capacitor C90, and resistor R183. The gate of N-channel power MOSFET Q3 is connected to the positive output terminal of the AC amplifier circuit through resistor R169, its drain is connected to the drain of N-channel power MOSFET Q4, and its source is connected to the negative terminal of Zener diode ZD16. Zener diodes ZD15 and ZD16 are connected in series in reverse, and the voltage across Zener diode ZD15 is... The negative terminals are connected to the positive output of the AC amplifier circuit and the negative terminal of Zener diode ZD17, respectively. Capacitor C89 and resistor R182 are connected in parallel, and their two ends are connected to the negative terminal of Zener diode ZD16 and ground, respectively. The gate of N-channel power MOSFET Q4 is connected to the negative terminal of Zener diode ZD17 through resistor R170. The drain also serves as the positive output of the oscillation circuit, outputting the first oscillation signal and is connected to the positive terminal of diode D9. The source is connected to the negative terminal of Zener diode ZD18. Zener diodes ZD17 and ZD18 are connected in series in reverse. Capacitor C90 and resistor R183 are connected in parallel, and their two ends are connected to the negative terminal of Zener diode ZD18 and ground, respectively. The second transformer... The excitation circuit includes resistor R207, N-channel power MOSFET Q10, Zener diodes ZD21 and ZD22, capacitor C107, resistors R214 and R208, N-channel power MOSFET Q11, Zener diodes ZD23 and ZD24, capacitor C108, and resistor R215. The gate of N-channel power MOSFET Q10 is connected to the negative output terminal of the AC amplifier circuit through resistor R207, its drain is connected to the drain of N-channel power MOSFET Q11, and its source is connected to the negative terminal of Zener diode ZD22. Zener diodes ZD21 and ZD22 are connected in series in reverse order, and Zener diode ZD21... The negative terminals of the capacitors are connected to the negative output terminal of the AC amplifier circuit and the negative terminal of the Zener diode ZD23, respectively. The capacitor C107 and resistor R214 are connected in parallel, and their two ends are connected to the negative terminal of the Zener diode ZD22 and ground, respectively. The gate of the N-channel power MOSFET Q11 is connected to the negative terminal of the Zener diode ZD23 through resistor R208. The drain also serves as the negative output terminal of the oscillation circuit, outputting the second oscillation signal and is connected to the positive terminal of the diode D11. The source is connected to the negative terminal of the Zener diode ZD24. The Zener diodes ZD23 and ZD24 are connected in series in reverse. The capacitor C108 and resistor R215 are connected in parallel, and their two ends are connected to the negative terminal of the Zener diode ZD24 and ground, respectively.

[0076] The bias circuit can raise the input bias voltage of N-channel power MOSFETs Q3, Q4, Q10, and Q11. The selected N-channel power MOSFETs Q3, Q4, Q10, and Q11 are STP4NK60Z, but can also be replaced with other models well-known to those skilled in the art.

[0077] In one embodiment, the AC control circuit for the mass spectrometer quadrupole further includes an adjustment circuit, which comprises a common-mode inductor L6, a high-voltage power supply circuit, a high-voltage loop circuit, a loss current feedback circuit, and a first filter circuit, wherein:

[0078] The first and second pins of the common-mode inductor L6 form the first winding, the third and fourth pins form the second winding, and the fourth pin of the common-mode inductor L6 is grounded through the first filter circuit and connected to the second pin of the connector J7.

[0079] The high-voltage power supply circuit includes capacitor C96, capacitor C97, diode D15, relay RL1, connector JP1, diode D21, resistors R30, R29, R275, and NPN transistor Q17. The third pin of common-mode inductor L6 is connected to the cathode of diode D15 and connected to 0V via parallel capacitors C96 and C97. The first pin of relay RL1 is connected to the positive terminal of the power supply and the cathode of diode D21. The second pin is connected to the anode of diode D21 and one end of resistor R30. The seventh pin is connected to the cathode of diode D15. The collector of NPN transistor Q17 is connected to the other end of resistor R30, the emitter is connected to 0V, and the base is connected to the RF_PWR terminal via resistor R29 for external high voltage. The two ends of resistor R275 are connected to the base and emitter of NPN transistor Q17 respectively. The two pins of connector JP1 are connected to the sixth and eighth pins of relay RL1 respectively, and the sixth and fifth pins and the seventh and eighth pins of relay RL1 are connected. The sixth pin of relay RL1 also serves as the RF+ terminal for external 96V positive terminal access.

[0080] The high-voltage circuit includes capacitors C103 and C104. The second pin of the common-mode inductor L6 is connected to 0V through the parallel capacitors C103 and C104, and serves as the RF terminal for external 96V negative terminal connection.

[0081] The loss current feedback circuit includes resistors R219, R217, and R75, capacitor C137, and connector J2. The first pin of the common-mode inductor L6 is grounded through the parallel resistors R219 and R217 and serves as the RFI terminal for measuring the energy loss of the circuit operation. The first pin of the common-mode inductor L6 is also grounded through resistor R75 and capacitor C137 in sequence. The two pins of connector J2 are connected to ground and the common terminal of resistor R75 and capacitor C137, respectively.

[0082] The first pin of the common-mode inductor L6 serves as the RFI terminal for measuring the circuit's operating energy consumption (RF Current Monitor). Diode D15 is selected as SS210, diode D21 as 1N4148W, NPN transistor Q17 as MMBT3904, connector JP1 as 210S-1*2P, connector J2D as S2B-XH-A-(LF)(SN), and relay RL1 as HF115F-012-1HS3. The selected relays can be replaced with other relays well-known to those skilled in the art, but should meet the 96V withstand voltage requirement. Contactless relays are preferred to avoid electrical sparks.

[0083] In one embodiment, the first filter circuit includes electrolytic capacitors CE3, CE4, C105, and C106. The positive terminals of electrolytic capacitors CE3 and CE4, one end of capacitor C105, and one end of capacitor C106 are all connected to the fourth pin of common-mode inductor L6. The negative terminals of electrolytic capacitors CE3 and CE4, the other end of capacitor C105, and the other end of capacitor C106 are all grounded.

[0084] In one embodiment, the adjustment circuit further includes an indicator circuit, which includes resistors R206 and R212 and a light-emitting diode LED1. The fourth pin of the common-mode inductor L6 is connected to the positive terminal of the light-emitting diode LED1 in sequence through resistors R206 and R212, and the negative terminal of the light-emitting diode LED1 is grounded.

[0085] In one embodiment, the negative feedback circuit further includes resistor R168, capacitor C81, resistor R167, and resistor R172. Resistor R167 and resistor R172 are connected in parallel, with one end connected to the inverting input terminal of operational amplifier U32 and the other end connected to one end of resistor R168 and connected to 0V voltage through capacitor C81. The other end of resistor R168 is connected to the processor to receive the MASS# signal.

[0086] In one embodiment, the AC control circuit for the quadrupole of the mass spectrometer further includes a first debugging circuit, which includes resistors R175, R178, and R181. The processor sends a first fine-tuning signal Co, a second fine-tuning signal Be, and an enable signal RFRESET. The first fine-tuning signal Co, the second fine-tuning signal Be, and the enable signal RFRESET are sequentially input to the inverting input of the operational amplifier U32 through resistors R175, R178, and R181 to achieve fine-tuning of the MASS# signal.

[0087] The method of adjusting the MASS# signal to adjust the AC voltage amplitude of the quadrupole by means of the first fine-tuning signal Co and the second fine-tuning signal Be is a well-known technique to those skilled in the art and will not be described in detail here.

[0088] In one embodiment, the AC control circuit for the mass spectrometer quadrupole further includes a second debugging circuit, which includes resistors R185, R187, R190, R191, R274, R193, R192, R195, R196, R197, R198, R203, a potentiometer VR3, an encoder rotary switch SW1, and a connector J9, wherein:

[0089] The signal output pin of potentiometer VR3 is connected to one end of resistor R185. The positive power supply pin is connected to pin C of encoder rotary switch SW1, and the negative power supply pin is connected to 0V. Pin C of encoder rotary switch SW1 also serves as the RRF terminal, used to connect the AC voltage of the actual output quadrupole to form a closed-loop control. It is connected to one end of resistor R187 and the first pin of connector J9. The first pin of encoder rotary switch SW1 is connected to one end of resistor R193. The second pin is connected to one end of resistor R274 through resistor R192. The fourth pin is connected to one end of resistor R191. The eighth pin is connected to resistor R1... One end of resistor R185, R187, R190, R191, R274, and R193 are connected to the inverting input of operational amplifier U32. The first, second, fourth, and eighth pins of encoder rotary switch SW1 are also connected to the second pin of connector J9 via resistors R195, R196, R197, and R198, respectively. One end of resistor R203 is connected to the second pin of connector J9 and serves as the RRFRTN1 terminal to provide a reference level. The other end is connected to the third pin of connector J9 and connected to 0V.

[0090] The RRF terminal is used to connect the AC voltage of the actual output quadrupole to form a complete closed-loop control, while the RRFRTN1 terminal provides a reference level for the entire closed-loop control circuit. The encoder rotary switch SW1 is model RV4A-16R-VB, or can be replaced with other models familiar to those skilled in the art. RRF1 is a switching signal that enables signal switching control, ensuring signal isolation in non-operating states and preventing signal crosstalk or overload. The GUARD RING is the protection ring.

[0091] Working principle:

[0092] A 96V voltage is applied to one end of the primary coil FIR1, and the other end is switched at a preset frequency, causing the current in the primary coil FIR1 to change accordingly over time. Simultaneously, the secondary coil FIR2 generates an induced electromotive force, creating a voltage difference based on the turns ratio (transformer principle). According to the principle of LC resonance, the oscillating circuit experiences minimal losses at resonance. This resonance can be achieved by adjusting the capacitor in the regulating circuit (the current flowing through the common-mode inductor L6 is used to visually indicate whether resonance has been achieved: the current is minimum at resonance). When the circuit does not resonate and the losses are very high (i.e., the current is very high), the enable signal RFRESET turns off the MASS# signal, causing the primary coil FIR1 to stop working, thus protecting the circuit components.

[0093] All control signals (MASS#, Co, Be, RFRESET, RRF) together constitute the input signal of this circuit. Operational amplifier U32 dynamically adjusts the excitation signals required by the intermediate amplifier stages, causing the transformer with a 96V voltage to operate and obtain the final AC current, which is applied to the two sets of poles of the quadrupole. The voltage applied to the primary coil FIR1 is adjusted by regulating the current through the common-mode inductor L6, thus achieving resonance regulation. After successful tuning, the circuit operates normally. If the current is too high, the tuning is unsuccessful, and the primary coil FIR1 stops working, protecting the circuit and instrument. The 96V voltage is applied to the quadrupole DIAGRAM (transformer) through the common-mode inductor L6. The other inductor of the common-mode inductor L6 simultaneously generates current. The energy loss of the circuit can be obtained by measuring the voltage difference formed by the current flowing through resistors R217 and R219. The oscillation frequency of this circuit is determined by an 8MHz frequency generated by crystal oscillator X1 (active crystal oscillator) and then divided by a frequency divider chip (flip-flop U28) to obtain a 2MHz sine wave signal.

[0094] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0095] The embodiments described above are merely specific and detailed examples of the embodiments described in this application, and should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the appended claims.

Claims

1. An AC control circuit for a quadrupole mass spectrometer, characterized in that: It includes a frequency excitation circuit, a negative feedback circuit, a DC-to-AC converter circuit, an AC amplifier circuit, an oscillation circuit, and a power supply circuit, among which: The frequency excitation circuit is used to output a first excitation signal and a second excitation signal; The negative feedback circuit includes an operational amplifier U32, capacitors C86, C92, and C93. The positive power supply terminal of the operational amplifier U32 is connected to the positive terminal of the power supply and grounded through capacitor C92. The negative power supply terminal is connected to the negative terminal of the power supply and grounded through capacitor C93. The non-inverting input terminal is grounded. The inverting input terminal is used to receive the MASS# signal from an external processor to adjust the AC voltage amplitude of the quadrupole and is connected to the output terminal of the operational amplifier U32 through capacitor C86. The output terminal of the operational amplifier U32 also serves as the REFAIL terminal for circuit cutoff protection. The DC-to-AC circuit has its input terminal connected to the output terminal of the operational amplifier U32, and is used to convert the positive and negative DC power into AC power respectively according to the received first excitation signal and second excitation signal. The AC amplifier circuit is used to amplify the voltage of the two AC outputs from the DC-to-AC circuit. The oscillation circuit is used to amplify the amplified voltage again and form a resonance, and output the first oscillation signal and the second oscillation signal respectively. The power supply circuit includes diode D9, Zener diode ZD19, diode D11, Zener diode ZD20, connector J7, and a quadrupole coil. The quadrupole coil includes a primary coil FIR1 and a secondary coil FIR2. The cathode of diode D9 is connected to the cathode of Zener diode ZD19. The anode of diode D9 is connected to the first pin of connector J7 and is used to receive the first oscillation signal. The anode of Zener diode ZD19 is connected to the second pin of connector J7. The cathode of diode D11 is connected to the cathode of Zener diode ZD20. The diode D11 is connected to the fourth pin of connector J7 and is used to receive the second oscillation signal. The anode of the Zener diode ZD20 is connected to the third pin of connector J7, and the second and third pins of connector J7 are connected. The first and second pins of connector J7 are connected to the two ends of the primary coil FIR1, and the third and fourth pins of connector J7 are connected to the two ends of the secondary coil FIR2. The primary coil FIR1 and the secondary coil FIR2 are also used to connect to a set of poles of the quadrupole, respectively.

2. The AC control circuit for a mass spectrometer quadrupole as described in claim 1, characterized in that: The frequency excitation circuit includes a DC / DC power supply chip U36, resistor R155, crystal oscillator X1, resistor R270, capacitor C68, resistor R268, trigger U28, resistor R156, capacitor C73, switch SW2, inverter U31, capacitor C79, resistor R269, resistor R164, capacitor C140, and connector J3, wherein: The power input pin of the DC / DC power chip U36 is connected to the positive power supply. The power output pins are connected to one end of resistors R155 and R270 respectively. The ground pin is connected to 0V. The other end of resistor R270 is connected to the positive power supply. The tri-state control pin of the crystal oscillator X1 is connected to the other end of resistor R155. The power supply pin is connected to the common terminal of resistors R155 and R270 and connected to 0V through capacitor C68. The ground pin is connected to 0V. The clock output pin is connected to 0V through resistor R268. The first channel clock input clear pin and the first channel preset pin of the trigger U28 are connected to the positive power supply. The first channel data input pin and the first channel inverted output pin are connected. The first channel clock input pin is connected to the clock output pin of the crystal oscillator X1. The first channel positive output pin is connected to the moving contact of the switch SW2 through the resistor R156. The ground pin is connected to 0V. The second channel inverted output pin is connected to the second channel data input pin and outputs the second excitation signal. The first channel positive output pin outputs the first excitation signal. The second channel preset pin, the second channel clock input clear pin, and the power supply pin are interconnected and connected to the positive terminal of the power supply. They are also connected to 0V through the capacitor C73. The second channel clock input pin is connected to the moving contact of the switch SW2. The signal input pins of inverter U31 are connected to one end of capacitor C140, resistor R269, and resistor R164, respectively. The signal output pin is connected to the stationary contact of switch SW2. The ground pin is connected to 0V voltage. The power supply positive pin is connected to the power supply positive terminal and is connected to the other end of resistor R269. The two pins of connector J3 are grounded and connected to the other end of capacitor C140, respectively. The two ends of capacitor C79 are connected to 0V voltage and the power supply positive pin of inverter U31, respectively. The other end of resistor R164 is connected to the ground pin of inverter U31.

3. The AC control circuit for a mass spectrometer quadrupole as described in claim 1, characterized in that: The DC-to-AC circuit includes resistors R179, R173, and R184, a potentiometer VR10, resistor R125, an NPN transistor Q2, a diode D6, resistor R56, capacitor C85, an NPN transistor Q7, a diode D12, resistor R57, capacitor C99, and a four-channel analog switch U30. One end of resistor R179 is connected to the output of operational amplifier U32, and the other end is connected to one end of resistors R173 and R184 respectively. The signal output pin of potentiometer VR10 is connected to the negative terminal of the power supply through resistor R125. The positive terminal pin of the power supply is connected to the other end of resistor R173, and the negative terminal pin of the power supply is connected to the other end of resistor R184. The collector of NPN transistor Q2 is connected to the positive terminal of the power supply, the emitter is connected to the anode of diode D6, and the base is connected to the positive terminal pin of potentiometer VR10. The collector of NPN transistor Q7 is connected to the positive terminal of the power supply. The emitter is connected to the anode of diode D12, and the base is connected to the negative power supply pin of potentiometer VR10. The first and sixteenth pins of the four-channel analog switch U30 are used to receive the first excitation signal, and the eighth and ninth pins are used to receive the second excitation signal. One end of resistor R56 and capacitor C85 is connected to the cathode of diode D6 and the second pin of the four-channel analog switch U30, and the other end is connected to the negative power supply and the sixth pin of the four-channel analog switch U30. One end of resistor R57 and capacitor C99 is connected to the cathode of diode D12 and the tenth pin of the four-channel analog switch U30, and the other end is connected to the negative power supply and the fourteenth pin of the four-channel analog switch U30. The third and seventh pins of the four-channel analog switch U30 are interconnected, and the eleventh and fifteenth pins of the four-channel analog switch U30 are also connected to the AC amplifier circuit.

4. The AC control circuit for a mass spectrometer quadrupole as described in claim 3, characterized in that: The AC control circuit for the quadrupole of the mass spectrometer further includes a rectifier bridge circuit. The rectifier bridge circuit includes diode group D8, capacitor C151, inductor L4, capacitor C87, resistor R176, capacitor C84, capacitor C88, diode group D13, capacitor C152, inductor L5, capacitor C100, resistor R202, capacitor C98, and capacitor C101. Diode group D8 includes a first Schottky diode and a second Schottky diode. The anode of the first Schottky diode is connected to the cathode of the second Schottky diode and the third pin of the four-way analog switch U30. One end of the inductor L4 is connected to the cathode of the first Schottky diode and the anode of the second Schottky diode, and is connected to 0V through capacitor C151. The other end of the inductor L4 is connected to 0V through resistor R176, capacitor C84, and capacitor C88 in sequence. The capacitor C87 is connected to 0V. The diode group D13 includes a third Schottky diode and a fourth Schottky diode. The anode of the third Schottky diode is connected to the cathode of the fourth Schottky diode and the eleventh pin of the four-way analog switch U30. One end of the inductor L5 is connected to the cathode of the third Schottky diode and the anode of the fourth Schottky diode, and is connected to 0V through the capacitor C152. The other end of the inductor L5 is connected to 0V through the resistor R202, capacitor C98, and capacitor C101, and is connected to 0V through the capacitor C100. The common terminal of capacitors C84 and C88 is also connected to the positive input terminal of the AC amplifier circuit as the non-inverting output terminal of the rectifier bridge circuit. Capacitors C98 and C101 are also connected to the negative input terminal of the AC amplifier circuit as the inverting output terminal of the rectifier bridge circuit.

5. The AC control circuit for a mass spectrometer quadrupole as described in claim 4, characterized in that: The AC amplifier circuit includes a first push-pull circuit, a second push-pull circuit, a third push-pull circuit, and a fourth push-pull circuit, wherein: The first push-pull circuit includes resistors R171, R180, and R186, an NPN transistor Q5, and a capacitor C82. The base of the NPN transistor Q5 is connected to the common terminal of capacitors C84 and C88. The collector is connected to the positive terminal of the power supply and is connected to 0V through capacitor C82. The emitter is connected to 0V through resistor R186. The two ends of resistor R171 are connected to the base and collector of the NPN transistor Q5, respectively. The two ends of resistor R180 are connected to the base of the NPN transistor Q5 and the 0V terminal of resistor R186, respectively. The common terminal of resistors R171 and R180 serves as the positive input terminal of the AC amplifier circuit. The second push-pull circuit includes resistors R200, R205, and R209, an NPN transistor Q9, and a capacitor C95. The base of the NPN transistor Q9 is connected to the common terminal of capacitors C98 and C101. The collector is connected to the positive terminal of the power supply and is connected to 0V through capacitor C95. The emitter is connected to 0V through resistor R209. The two ends of resistor R200 are connected to the base and collector of the NPN transistor Q9, respectively. The two ends of resistor R205 are connected to the base of the NPN transistor Q9 and the 0V terminal of resistor R209, respectively. The common terminal of resistors R200 and R205 serves as the negative input terminal of the AC amplifier circuit. The third push-pull circuit includes capacitors C80 and C91, diodes D5, D7, and D10, resistors R165, R189, R166, and R177, an NPN transistor Q1, a PNP transistor Q6, capacitors C83 and C149. One end of each of capacitors C80 and C91 is connected to the emitter of NPN transistor Q5. The base of NPN transistor Q1 is connected to the other end of capacitor C80 and the anode of diode D5. The collector of transistor Q1 is connected to the positive terminal of the power supply and then to 0V via capacitor C149. The emitter is connected to the diode via resistor R166. One end of capacitor C83 is connected to the base and collector of NPN transistor Q1, respectively. The emitter of PNP transistor Q6 is connected to the common terminal of resistor R166 and capacitor C83 through resistor R177. The base is connected to the other end of capacitor C91 and the negative terminal of diode D10. The collector is connected to 0V. Diodes D5, D7, and D10 are connected in series in the same direction. The two ends of resistor R189 are connected to the base and collector of PNP transistor Q6, respectively. The other end of capacitor C83 serves as the positive output terminal of the AC amplifier circuit. The fourth push-pull circuit includes capacitors C94 and C109, diodes D14, D16, and D17, resistors R194, R216, R204, and R211, an NPN transistor Q8, a PNP transistor Q12, capacitors C102 and C150. One end of each of capacitors C94 and C109 is connected to the emitter of the NPN transistor Q9. The base of the NPN transistor Q8 is connected to the other end of capacitor C94 and the anode of diode D14, respectively. The collector is connected to 0V, and the emitter is connected to one end of capacitor C102 through resistor R204. The two ends of 194 are connected to the base and collector of the NPN transistor Q8, respectively. The emitter of the PNP transistor Q12 is connected to the common terminal of the resistor R204 and the capacitor C102 through the resistor R211. The base is connected to the other end of the capacitor C109 and the cathode of the diode D17. The collector is connected to the negative terminal of the power supply and connected to 0V through the capacitor C150. The diodes D14, D16 and D17 are connected in series in the same direction. The two ends of the resistor R216 are connected to the base and collector of the PNP transistor Q12, respectively. The other end of the capacitor C102 serves as the negative output terminal of the AC amplifier circuit.

6. The AC control circuit for a mass spectrometer quadrupole as described in claim 1, characterized in that: The oscillation circuit includes a bias circuit, a first transformer excitation circuit, and a second transformer excitation circuit, wherein: The bias circuit includes resistors R174 and R199, potentiometers VR4 and VR6, resistor R210, capacitor C148, resistor R213, capacitor C110, and Zener diode ZD25. The two ends of resistor R174 are connected to one end of resistor R199 and the positive output terminal of the AC amplifier circuit, respectively. The two ends of capacitor C148 are connected to the other end of resistor R199 and the negative power supply pin of potentiometer VR6, respectively. The signal output pin of potentiometer VR4 is connected to the common terminal of resistors R174 and R199, and the positive power supply pin is connected to the positive power supply pin of potentiometer VR6. The positive power supply pin of the 6 is connected, the negative terminal of the Zener diode ZD25 is connected to the positive power supply through the resistor R213, the capacitor C110 is connected in parallel with the Zener diode ZD25, and the negative terminal of the Zener diode ZD25 is also connected to the positive power supply pin of the potentiometer VR6, and the positive terminal is connected to the negative power supply pin of the potentiometer VR6. The negative power supply pins of the potentiometers VR4 and VR6 are both connected to 0V. The signal output pin of the potentiometer VR6 is connected to the common terminal of the resistor R199 and the capacitor C148, and is connected to the other end of the capacitor C102 through the resistor R210. The first transformer excitation circuit includes a resistor R169, an N-channel power MOSFET Q3, a Zener diode ZD15, a Zener diode ZD16, a capacitor C89, a resistor R182, a resistor R170, an N-channel power MOSFET Q4, a Zener diode ZD17, a Zener diode ZD18, a capacitor C90, and a resistor R183. The gate of the N-channel power MOSFET Q3 is connected to the positive output terminal of the AC amplifier circuit through the resistor R169, the drain is connected to the drain of the N-channel power MOSFET Q4, and the source is connected to the negative terminal of the Zener diode ZD16. The Zener diodes ZD15 and ZD16 are connected in series in reverse, and the negative terminal of the Zener diode ZD15 is... The capacitor C89 and resistor R182 are connected in parallel, and their two ends are connected to the negative terminal of the Zener diode ZD16 and ground, respectively. The gate of the N-channel power MOSFET Q4 is connected to the negative terminal of the Zener diode ZD17 through the resistor R170. The drain of the MOSFET also serves as the positive output terminal of the oscillation circuit, outputting the first oscillation signal and being connected to the positive terminal of the diode D9. The source of the MOSFET is connected to the negative terminal of the Zener diode ZD18. The Zener diodes ZD17 and ZD18 are connected in series in reverse. The capacitor C90 and resistor R183 are connected in parallel, and their two ends are connected to the negative terminal of the Zener diode ZD18 and ground, respectively.The second transformer excitation circuit includes a resistor R207, an N-channel power MOSFET Q10, a Zener diode ZD21, a Zener diode ZD22, a capacitor C107, a resistor R214, a resistor R208, an N-channel power MOSFET Q11, a Zener diode ZD23, a Zener diode ZD24, a capacitor C108, and a resistor R215. The gate of the N-channel power MOSFET Q10 is connected to the negative output terminal of the AC amplifier circuit through the resistor R207, the drain is connected to the drain of the N-channel power MOSFET Q11, and the source is connected to the negative terminal of the Zener diode ZD22. The Zener diodes ZD21 and ZD22 are connected in series in reverse, and the negative terminal of the Zener diode ZD21 is connected in series. The capacitor C107 and resistor R214 are connected in parallel to the negative output terminal of the AC amplifier circuit and the negative terminal of the Zener diode ZD23, respectively. Their terminals are connected to the negative terminal of the Zener diode ZD22 and ground, respectively. The gate of the N-channel power MOSFET Q11 is connected to the negative terminal of the Zener diode ZD23 through resistor R208. Its drain also serves as the negative output terminal of the oscillation circuit, outputting the second oscillation signal and connected to the positive terminal of diode D11. Its source is connected to the negative terminal of the Zener diode ZD24. Zener diodes ZD23 and ZD24 are connected in series in reverse order. The capacitor C108 and resistor R215 are connected in parallel, with their terminals connected to the negative terminal of the Zener diode ZD24 and ground, respectively.

7. The AC control circuit for a mass spectrometer quadrupole as described in claim 1, characterized in that: The AC control circuit for the mass spectrometer quadrupole also includes an adjustment circuit, which comprises a common-mode inductor L6, a high-voltage power supply circuit, a high-voltage loop circuit, a loss current feedback circuit, and a first filter circuit, wherein: The first and second pins of the common-mode inductor L6 form a first winding, the third and fourth pins form a second winding, and the fourth pin of the common-mode inductor L6 is grounded through a first filter circuit and connected to the second pin of the connector J7. The high-voltage power supply circuit includes capacitor C96, capacitor C97, diode D15, relay RL1, connector JP1, diode D21, resistor R30, resistor R29, resistor R275, and NPN transistor Q17. The third pin of the common-mode inductor L6 is connected to the negative terminal of diode D15 and is connected to 0V through the parallel capacitors C96 and C97. The first pin of relay RL1 is connected to the positive terminal of the power supply and the negative terminal of diode D21, the second pin is connected to the positive terminal of diode D21 and one end of resistor R30, and the seventh pin is connected to the positive terminal of diode D15. The collector of the NPN transistor Q17 is connected to the other end of the resistor R30, the emitter is connected to 0V, and the base is connected to the RF_PWR terminal via the resistor R29 for external high voltage. The two ends of the resistor R275 are connected to the base and emitter of the NPN transistor Q17, respectively. The two pins of the connector JP1 are connected to the sixth and eighth pins of the relay RL1, respectively. The sixth and fifth pins, and the seventh and eighth pins of the relay RL1 are connected. The sixth pin of the relay RL1 also serves as the RF+ terminal for external 96V positive terminal access. The high-voltage circuit includes capacitors C103 and C104. The second pin of the common-mode inductor L6 is connected to 0V voltage through the parallel capacitors C103 and C104, and serves as the RF terminal for external 96V negative terminal connection. The loss current feedback circuit includes resistors R219, R217, and R75, capacitor C137, and connector J2. The first pin of the common-mode inductor L6 is grounded through the parallel resistors R219 and R217, and serves as an RFI terminal for measuring the energy loss of the circuit operation. The first pin of the common-mode inductor L6 is also grounded through the resistors R75 and C137 in sequence. The two pins of connector J2 are respectively connected to ground and the common terminal of the resistors R75 and C137.

8. The AC control circuit for a mass spectrometer quadrupole as described in claim 7, characterized in that: The first filter circuit includes electrolytic capacitors CE3, CE4, C105, and C106. The positive terminals of electrolytic capacitors CE3 and CE4, one end of capacitor C105, and one end of capacitor C106 are all connected to the fourth pin of the common-mode inductor L6. The negative terminals of electrolytic capacitors CE3 and CE4, the other end of capacitor C105, and the other end of capacitor C106 are all grounded.

9. The AC control circuit for a mass spectrometer quadrupole as described in claim 7, characterized in that: The adjustment circuit also includes an indicator circuit, which includes resistors R206 and R212 and a light-emitting diode LED1. The fourth pin of the common-mode inductor L6 is connected to the positive terminal of the light-emitting diode LED1 in sequence through resistors R206 and R212, and the negative terminal of the light-emitting diode LED1 is grounded.

10. The AC control circuit for a mass spectrometer quadrupole as described in claim 1, characterized in that: The negative feedback circuit also includes resistor R168, capacitor C81, resistor R167, and resistor R172. Resistor R167 and resistor R172 are connected in parallel, with one end connected to the inverting input terminal of the operational amplifier U32, and the other end connected to one end of resistor R168 and connected to 0V voltage through capacitor C81. The other end of resistor R168 is connected to the processor to receive the MASS# signal.

11. The AC control circuit for a mass spectrometer quadrupole as described in claim 1, characterized in that: The AC control circuit for the quadrupole of the mass spectrometer further includes a first debugging circuit, which includes resistors R175, R178, and R181. The processor sends a first fine-tuning signal Co, a second fine-tuning signal Be, and an enable signal RFRESET. The first fine-tuning signal Co, the second fine-tuning signal Be, and the enable signal RFRESET are sequentially input to the inverting input of the operational amplifier U32 through resistors R175, R178, and R181 to achieve fine-tuning of the MASS# signal.

12. The AC control circuit for a mass spectrometer quadrupole as described in claim 1, characterized in that: The AC control circuit for the mass spectrometer quadrupole also includes a second debugging circuit, which comprises resistors R185, R187, R190, R191, R274, R193, R192, R195, R196, R197, R198, and R203, a potentiometer VR3, an encoder rotary switch SW1, and a connector J9, wherein: The signal output pin of potentiometer VR3 is connected to one end of resistor R185, the positive power supply pin is connected to pin C of encoder rotary switch SW1, and the negative power supply pin is connected to 0V. Pin C of encoder rotary switch SW1 also serves as the RRF terminal for connecting the AC voltage of the actual output quadrupole to form a closed-loop control, and is connected to one end of resistor R187 and the first pin of connector J9 respectively. The first pin of encoder rotary switch SW1 is connected to one end of resistor R193, the second pin is connected to one end of resistor R274 through resistor R192, the fourth pin is connected to one end of resistor R191, and the eighth pin is connected to... One end of resistor R190 is connected to the inverting input terminal of the operational amplifier U32, and the other ends of resistors R185, R187, R190, R191, R274 and R193 are all connected to the inverting input terminal of the operational amplifier U32. The first, second, fourth and eighth pins of the encoder rotary switch SW1 are also connected to the second pin of connector J9 through resistors R195, R196, R197 and R198 respectively. One end of resistor R203 is connected to the second pin of connector J9 and serves as the RRFRTN1 terminal to provide a reference level, and the other end is connected to the third pin of connector J9 and connected to 0V voltage.

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