EMC control circuit of plasma scalpel pulse high-voltage power supply

Abstract

The invention discloses an EMC control circuit of a plasma scalpel pulse high-voltage power supply, which comprises a control module, an EMC filtering module and a DC-DC conversion module, and is characterized in that the control module is connected with the EMC filtering module and the DC-DC conversion module, the EMC filtering module is used for removing electromagnetic interference of an AC power supply signal and feeding back the AC power supply signal after EMC filtering to the control module, and the DC-DC conversion module is connected with the EMC filtering module. According to the temperature recognition device for the working end of the plasma operation electrode (tool bit), after equipment is powered on, the host records and displays the real-time temperature, when the real-time temperature exceeds the upper limit 70 DEG C of the set temperature, power is automatically cut off, working is stopped, after the temperature is lowered, plasma is excited through power-on again, and working continues; meanwhile, the working end is provided with an impedance recognition device with a resistance value, and the impedance recognition device is used for recognizing the impedance and self-adapting to impedance change to provide response power output feedback.

Description

Technical Field

[0001] The present invention relates to the technical field of power control, and particularly relates to an EMC control circuit for a pulsed high-voltage power supply of a plasma scalpel. Background Art

[0002] The AC power supply can effectively remove electromagnetic interference after passing through the EMC filter. The rectified AC power supply after passing through the EMC filter is filtered again to reduce the pulsating component. Since the pulsating component of the pulsating DC signal after rectification and filtering has been significantly reduced, it can be used as the power supply for the subsequent circuit. The plasma scalpel requires a high-voltage pulse signal for the power supply signal. Therefore, the rectified and filtered power supply needs to be first converted from DC to DC into a high-voltage DC signal, and then converted into a high-voltage pulse signal. However, if the DC power supply with pulsating components is directly fed back to the DC-DC conversion module, it will cause the internal circuit of the module to have a pulse overcharge phenomenon, and then its output voltage will exceed the set value in a short time, causing damage to the load and reducing the reliability of the entire system. Therefore, an EMC control circuit for a pulsed high-voltage power supply of a plasma scalpel is proposed, which can further remove the pulsating component while using the pulsating DC signal after rectification and filtering as the power supply signal basis for the subsequent circuit, and can adaptively adjust the pure DC power supply output by its gain based on the required voltage of the DC-DC conversion module, and feedback a signal indicating the completion of the adjustment to the DC-DC conversion module after the adjustment is completed. Summary of the Invention

[0003] In view of the above technical problems, the object of the present invention is to provide an EMC control circuit for a pulsed high-voltage power supply of a plasma scalpel, including a control module, an EMC filter module, and a DC-DC conversion module. The control module is connected to the EMC filter module and the DC-DC conversion module. The EMC filter module is used to remove the electromagnetic interference of the AC power supply signal and feedback the AC power supply signal after EMC filtering to the control module. The DC-DC conversion module is used to feedback the required voltage and convert the DC power supply signal fed back by the control module. The control module is used to rectify and filter the AC power supply, and further remove its pulsating component based on this as the power supply basis. At the same time, the control module adaptively adjusts the pure DC power supply output by its gain based on the required voltage of the DC-DC conversion module.

[0004] Furthermore, it further includes a first transformer T1, a first rectifier bridge D1, a second zener diode D2, a first capacitor C1, and a fourth resistor R4;

[0005] The primary winding of the first transformer T1 is used to receive an AC power signal. The secondary winding of the first transformer T1 is connected to the input end of the first rectifier bridge D1. The output end of the first rectifier bridge D1 is connected to one end of the fourth resistor R4. The other end of the fourth resistor R4 is connected to the anode of the second voltage stabilizing diode D2. The other end of the first capacitor C1, the cathode of the second voltage stabilizing diode D2, and the ground terminal are connected.

[0006] Further, it further includes a third digital potentiometer U3, a first triode Q1, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a fourteenth resistor R14, and a fifteenth resistor R15;

[0007] The third pin of the third digital potentiometer U3 is connected to the collector of the first triode Q1 and one end of the twelfth resistor R12. The eleventh pin and the twelfth pin of the third digital potentiometer U3 are connected to one end of the tenth resistor R10. The base of the first triode Q1 is connected to one end of the eleventh resistor R11. The emitter of the first triode Q1 is connected to one end of the fourteenth resistor R14 and one end of the fifteenth resistor R15. The other end of the tenth resistor R10 is connected to the anode of the second voltage stabilizing diode D2. The other end of the fifteenth resistor R15 is connected to the output end of the first rectifier bridge D1. The sixth pin, the tenth pin, the fourteenth pin of the third digital potentiometer U3, the other end of the eleventh resistor R11, the other end of the twelfth resistor R12, and the other end of the fourteenth resistor R14 are connected to the ground terminal.

[0008] Further, it further includes a first operational amplifier U1, a second operational amplifier U2, a fifth operational amplifier U5, a second resistor R2, a third resistor R3, an eighth resistor R8, a ninth resistor R9, a thirteenth resistor R13, and a first connector P1;

[0009] The non-inverting input end of the first operational amplifier U1 is connected to one end of the tenth resistor R10. The inverting input end of the first operational amplifier U1 is connected to one end of the thirteenth resistor R13. The output end of the first operational amplifier U1 is connected to one end of the second resistor R2, one end of the ninth resistor R9, and the other end of the thirteenth resistor R13. The non-inverting input end of the second operational amplifier U2 is connected to one end of the third resistor R3 and the output end of the fifth operational amplifier U5. The inverting input end of the second operational amplifier U2 is connected to one end of the eighth resistor R8 and the other end of the ninth resistor R9. The output end of the second operational amplifier U2 is connected to the other end of the eighth resistor R8 and the terminal of the first connector P1. The non-inverting input end of the fifth operational amplifier U5 is connected to the anode of the second voltage stabilizing diode D2. The inverting input end of the fifth operational amplifier U5 is connected to the other end of the third resistor R3. The other end of the second resistor R2 is connected to the ground terminal.

[0010] Further, it further includes a fourth operational amplifier U4, a sixth operational amplifier U6, a third diode D3, a first resistor R1, a fifth resistor R5, a seventh resistor R7, a sixteenth resistor R16, and a second connector P2;

[0011] The non-inverting terminal of the fourth operational amplifier U4 is connected to the terminal of the first connector P1. The inverting terminal of the fourth operational amplifier U4 is connected to one end of the first resistor R1 and the terminal of the second connector P2. The output terminal of the fourth operational amplifier U4 is connected to the fifth pin of the third digital potentiometer U3 and one end of the sixteenth resistor R16. The non-inverting terminal of the sixth operational amplifier U6 is connected to one end of the fourteenth resistor R14. The inverting terminal of the sixth operational amplifier U6 is connected to one end of the fifth resistor R5. The output terminal of the sixth operational amplifier U6 is connected to the anode of the third diode D3 and one end of the seventh resistor R7. The cathode of the third diode D3 is connected to the base of the first triode Q1. The other end of the first resistor R1, the other end of the fifth resistor R5, the other end of the seventh resistor R7, and the other end of the sixteenth resistor R16 are connected to the ground terminal.

[0012] Further, it further includes a second triode Q2, a third triode Q3, a sixth resistor R6, and a third connector P3;

[0013] The base of the second triode Q2 is connected to the terminal of the second connector P2. The emitter of the second triode Q2 is connected to one end of the sixth resistor R6. The collector of the second triode Q2 is connected to the base of the third triode Q3. The emitter of the third triode Q3 is connected to the output terminal of the fourth operational amplifier U4. The collector of the third triode Q3 is connected to the inverting terminal of the sixth operational amplifier U6 and the terminal of the third connector P3. The other end of the sixth resistor R6 is connected to the ground terminal.

[0014] The beneficial effects of the present invention compared with the prior art are:

[0015] The present invention can use the rectified and filtered pulsating DC signal as the power supply signal basis for the subsequent circuit, and further remove its pulsating components. At the same time, it can adaptively adjust the pure DC power supply with the gain output based on the required voltage of the DC-DC conversion module, and feedback the signal indicating the completion of the adjustment to the DC-DC conversion module after the adjustment is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required in the prior art and the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic diagram of the overall structure provided by the present invention.

[0018] Figure 2 Schematic diagram of the circuit structure provided by the present invention. Detailed implementation manners

[0019] In order to make the purpose and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text only describes one or several specific implementation manners of the present invention, and does not strictly limit the scope of protection specifically claimed by the present invention.

[0020] The present invention discloses an EMC control circuit for a pulsed high-voltage power supply of a plasma scalpel, including a control module, an EMC filtering module, and a DC-DC conversion module. The control module is connected to the EMC filtering module and the DC-DC conversion module. The EMC filtering module is used to remove electromagnetic interference from the AC power supply signal and feedback the EMC-filtered AC power supply signal to the control module. The DC-DC conversion module is used to feedback the required voltage and convert the DC power supply signal fed back by the control module. The control module is used to rectify and filter the AC power supply, and further remove its pulsating components based on this as the power supply basis. At the same time, the control module adaptively adjusts the pure DC power supply output by its gain based on the required voltage of the DC-DC conversion module.

[0021] As Figure 2 shown, specifically, it further includes a first transformer T1, a first rectifier bridge D1, a second zener diode D2, a first capacitor C1, and a fourth resistor R4;

[0022] The primary winding of the first transformer T1 is used to receive the AC power supply signal. The secondary winding of the first transformer T1 is connected to the input end of the first rectifier bridge D1. The output end of the first rectifier bridge D1 is connected to one end of the fourth resistor R4. The other end of the fourth resistor R4 is connected to the anode of the second zener diode D2. The other end of the first capacitor C1, the cathode of the second zener diode D2, and the ground terminal are connected.

[0023] As Figure 2 shown, specifically, it further includes a third digital potentiometer U3, a first triode Q1, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a fourteenth resistor R14, and a fifteenth resistor R15;

[0024] The third pin of the third digital potentiometer U3 is connected to the collector of the first triode Q1 and one end of the twelfth resistor R12. The eleventh pin and the twelfth pin of the third digital potentiometer U3 are connected to one end of the tenth resistor R10. One end of the base of the first triode Q1 is connected to one end of the eleventh resistor R11. The emitter of the first triode Q1 is connected to one end of the fourteenth resistor R14 and one end of the fifteenth resistor R15. The other end of the tenth resistor R10 is connected to the anode of the second voltage stabilizing diode D2. The other end of the fifteenth resistor R15 is connected to the output end of the first rectifier bridge D1. The sixth pin, the tenth pin, and the fourteenth pin of the third digital potentiometer U3, the other end of the eleventh resistor R11, the other end of the twelfth resistor R12, and the other end of the fourteenth resistor R14 are connected to the ground terminal.

[0025] As Figure 2 shown, specifically, it further includes a first operational amplifier U1, a second operational amplifier U2, a fifth operational amplifier U5, a second resistor R2, a third resistor R3, an eighth resistor R8, a ninth resistor R9, a thirteenth resistor R13, and a first connector P1;

[0026] The non-inverting terminal of the first operational amplifier U1 is connected to one end of the tenth resistor R10. The inverting terminal of the first operational amplifier U1 is connected to one end of the thirteenth resistor R13. The output terminal of the first operational amplifier U1 is connected to one end of the second resistor R2, one end of the ninth resistor R9, and the other end of the thirteenth resistor R13. The non-inverting terminal of the second operational amplifier U2 is connected to one end of the third resistor R3 and the output terminal of the fifth operational amplifier U5. The inverting terminal of the second operational amplifier U2 is connected to one end of the eighth resistor R8 and the other end of the ninth resistor R9. The output terminal of the second operational amplifier U2 is connected to the other end of the eighth resistor R8 and the terminal of the first connector P1. The non-inverting terminal of the fifth operational amplifier U5 is connected to the anode of the second voltage stabilizing diode D2. The inverting terminal of the fifth operational amplifier U5 is connected to the other end of the third resistor R3. The other end of the second resistor R2 is connected to the ground terminal.

[0027] As Figure 2 shown, specifically, it further includes a fourth operational amplifier U4, a sixth operational amplifier U6, a third diode D3, a first resistor R1, a fifth resistor R5, a seventh resistor R7, a sixteenth resistor R16, and a second connector P2;

[0028] The non-inverting input terminal of the fourth operational amplifier U4 is connected to the terminal of the first connector P1, the inverting input terminal of the fourth operational amplifier U4 is connected to one end of the first resistor R1 and the terminal of the second connector P2, and the output terminal of the fourth operational amplifier U4 is connected to the fifth pin of the third digital potentiometer U3 and one end of the sixteenth resistor R16. The non-inverting input terminal of the sixth operational amplifier U6 is connected to one end of the fourteenth resistor R14, the inverting input terminal of the sixth operational amplifier U6 is connected to one end of the fifth resistor R5, and the output terminal of the sixth operational amplifier U6 is connected to the anode of the third diode D3 and one end of the seventh resistor R7. The cathode of the third diode D3 is connected to the base of the first triode Q1, and the other end of the first resistor R1, the other end of the fifth resistor R5, the other end of the seventh resistor R7, and the other end of the sixteenth resistor R16 are connected to the ground terminal.

[0029] As Figure 2 shown, specifically, it further includes a second triode Q2, a third triode Q3, a sixth resistor R6, and a third connector P3;

[0030] The base of the second triode Q2 is connected to the terminal of the second connector P2, the emitter of the second triode Q2 is connected to one end of the sixth resistor R6, the collector of the second triode Q2 is connected to the base of the third triode Q3, the emitter of the third triode Q3 is connected to the output terminal of the fourth operational amplifier U4, the collector of the third triode Q3 is connected to the inverting input terminal of the sixth operational amplifier U6 and the terminal of the third connector P3, and the other end of the sixth resistor R6 is connected to the ground terminal.

[0031] Refer to Figure 1 、 Figure 2, the EMC filtering module consists of a common-mode filtering unit and a differential-mode filtering unit. The AC power signal removes its electromagnetic interference after being filtered by the EMC filtering module. The AC power signal after EMC filtering is step-down rectified by the first transformer T1 and the first rectifier bridge D1 to output a pulsating DC signal. The first capacitor C1 is used to filter the pulsating DC signal after step-down rectification by the first rectifier bridge D1 to reduce its pulsating amplitude. The signal at the output end of the first rectifier bridge D1 is the DC power signal for the subsequent circuit. Considering that the DC power supply for the subsequent circuit still has a certain pulsating component, if it is directly fed back to the DC-DC conversion module, it will cause the circuit inside the module to have a pulse overcharge phenomenon, which will in turn cause its output voltage to exceed the set value in a short time, thus possibly damaging the load or reducing the system reliability. The DC power signal passes through the fourth resistor R4 and the second zener diode D2 to the ground terminal loop. The second zener diode D2 operates in the reverse breakdown region so that the signal between the fourth resistor R4 and the second zener diode D2 can be stabilized at a certain amplitude. This amplitude signal is the gain reference signal required by the subsequent circuit. The DC power signal passes through the fifteenth resistor R15 and the fourteenth resistor R14 to the ground terminal. The signal at the fourteenth resistor R14 terminal passes through the emitter of the first transistor Q1, the base of the first transistor Q1, and the eleventh resistor R11 to the ground terminal loop. The emitter and the base of the first transistor Q1 are forward-biased, and the first transistor Q1 conducts. The signal at the fourteenth resistor R14 terminal passes through the emitter of the first transistor Q1, the collector of the first transistor Q1, and the twelfth resistor R12 to the ground terminal. The signal at the twelfth resistor R12 terminal is fed back to the 3-pin of the third digital potentiometer U3. The gain reference signal passes through the tenth resistor R10 and the third digital potentiometer U3 to the ground terminal loop. The tenth resistor R10 and the third digital potentiometer U3 divide the gain reference signal. The amplitude of the divided signal at the 12-pin of the third digital potentiometer U3 is the gain adjustment signal required by the subsequent circuit. While using the rectified and filtered pulsating DC signal as the power signal basis for the subsequent circuit, further removing its pulsating components, and at the same time providing a stable gain reference signal and gain adjustment signal feedback for the subsequent circuit, providing a gain adjustment basis for the subsequent circuit.

[0032] The gain adjustment signal is synchronously fed back to the non-inverting input terminal of the first operational amplifier U1. The output terminal of the first operational amplifier U1 is connected in negative feedback to the inverting input terminal of the first operational amplifier U1 through the thirteenth resistor R13, enabling the output terminal of the first operational amplifier U1 to follow the output gain adjustment signal while preventing interference from signals of the subsequent circuit. The gain reference signal is fed back to the non-inverting input terminal of the fifth operational amplifier U5. The output terminal of the fifth operational amplifier U5 is connected in negative feedback to the inverting input terminal of the fifth operational amplifier U5 through the fourteenth resistor R14, enabling the output terminal of the fifth operational amplifier U5 to follow the output gain reference signal while preventing interference from signals of the subsequent circuit. The gain reference signal is synchronously fed back to the non-inverting input terminal of the second operational amplifier U2. The output terminal of the second operational amplifier U2, the eighth resistor R8, the inverting input terminal of the second operational amplifier U2, the ninth resistor R9, and the second resistor R2 form a negative feedback network, enabling the output terminal of the second operational amplifier U2 to amplify the signal at its output terminal based on the gain coefficient. At the same time, the second operational amplifier U2 adjusts the amplitude of the signal at its inverting input terminal to be the same as that of the signal at its non-inverting input terminal through the feedback loop. The gain coefficient is the resistance ratio of the eighth resistor R8 and the ninth resistor R9. Just appropriately adjust the resistances of the eighth resistor R8 and the ninth resistor R9. The larger the gain coefficient, the higher the lower threshold of the pure DC power supply threshold range that can be obtained, and vice versa. The gain adjustment signal at the output terminal of the first operational amplifier U1 is synchronously fed back to the second resistor R2 terminal. When the gain adjustment signal output by the first operational amplifier U1 is fed back to the second resistor R2 terminal, the gain value of the signal at the output terminal of the second operational amplifier U2 is gain coefficient * (gain reference signal - gain adjustment signal) + gain reference signal. The signal at the output terminal of the second operational amplifier U2 is fed back to the DC-DC conversion module through the first connector P1. The signal at the output terminal of the second operational amplifier U2 is synchronously fed back to the non-inverting input terminal of the fourth operational amplifier U4. The second connector P2 terminal is used to obtain the required voltage signal fed back by the DC-DC conversion module. The first resistor R1 is a pull-down resistor for the inverting input terminal of the fourth operational amplifier U4. The signal at the fourteenth resistor R14 terminal is synchronously fed back to the non-inverting input terminal of the sixth operational amplifier U6. The fifth resistor R5 terminal is a pull-down resistor for the inverting input terminal of the sixth operational amplifier U6. When the device is powered on and the second connector P2 terminal does not obtain the required voltage signal feedback, the fourth operational amplifier U4 outputs. The signal at the output terminal of the fourth operational amplifier U4 goes through the sixteenth resistor R16 to the ground terminal. The signal at the sixteenth resistor R16 terminal is fed back to the 5th pin of the third digital potentiometer U3. The sixth operational amplifier U6 outputs. The signal at the output terminal of the sixth operational amplifier U6 goes through the seventh resistor R7 to the ground loop. The signal at the seventh resistor R7 terminal is fed back to the base of the first triode Q1 through the third diode D3, making the first triode Q1 in the cut-off state when the device is powered on. The 3rd pin of the third digital potentiometer U3 is at a low level, and the 5th pin is at a high level. The third digital potentiometer U3 increases its own resistance value. At this time, the amplitude of the gain adjustment signal is the maximum value that can be fed back. The signal at the output terminal of the second operational amplifier U2 is the lower threshold of the pure DC power supply threshold range.In this way, after the device is powered on, the initial feedback amplitude of the amplified pure DC power supply signal is the lower threshold of the DC power supply threshold range.

[0033] When the device is powered on and a demand voltage signal feedback is obtained at the P2 end of the second connector, the signal at the P2 end of the second connector passes through the base of the second triode Q2, the emitter of the second triode Q2, and the sixth resistor R6 to the ground terminal loop. There is a forward bias between the base and the emitter of the second triode Q2, and the second triode Q2 conducts. At the same time, the fourth operational amplifier U4 is cut off, and the 5th pin of the third digital potentiometer U3 is at a low level. The third digital potentiometer U3 reduces its own resistance value, the amplitude of the gain adjustment signal decreases, and at the same time, the signal gain at the output end of the second operational amplifier U2 is increased. When the signal amplitude at the output end of the second operational amplifier U2 is the same as the amplitude of the demand voltage signal feedback obtained at the P2 end of the second connector, the fourth operational amplifier U4 outputs. The signal at the output end of the fourth operational amplifier U4 passes through the emitter of the third triode Q3, the base of the third triode Q3, the collector of the second triode Q2, the emitter of the second triode Q2, and the sixth resistor R6 to the ground terminal loop. There is a forward bias between the emitter and the base of the third triode Q3, and the third triode Q3 conducts. The signal at the output end of the fourth operational amplifier U4 is fed back to the inverting terminal of the sixth operational amplifier U6 through the emitter of the third triode Q3 and the base of the third triode Q3. The sixth operational amplifier U6 is cut off, the first triode Q1 conducts, and the 3rd pin of the third digital potentiometer U3 is at a high level. The third digital potentiometer U3 stops adjusting. At this time, the signal amplitude at the output end of the second operational amplifier U2 is the amplitude of the demand voltage signal of the DC-DC conversion module. At the same time, the signal at the inverting terminal of the sixth operational amplifier U6 is fed back to the DC-DC conversion module through the third connector P3. The signal at the P3 end of the third connector is the signal indicating that the adjustment is completed. When the DC-DC conversion module obtains this signal feedback, it performs DC-DC conversion on the signal obtained at the P1 end of the first connector. In this way, when the demand voltage feedback of the DC-DC conversion module is obtained, the pure DC power supply output by the gain can be adaptively adjusted, and after the adjustment is completed, a signal indicating that the adjustment is completed is fed back to the DC-DC conversion module.

[0034] In another way of the present invention, for the temperature recognition device at the working end of the plasma surgical electrode (tool tip) of the present invention, after the device is powered on, the host records and displays the real-time temperature. When the real-time temperature exceeds the set temperature upper limit of 70 °C, the power is automatically cut off and the work stops. After the temperature drops, the power is turned on again to excite the plasma and continue to work. At the same time, an impedance recognition device with a resistance value is provided at the working end to recognize the magnitude of the impedance and provide a corresponding power output feedback for the adaptive impedance change.

[0035] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Accordingly, all changes that fall within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. An EMC control circuit for a plasma surgical knife pulse high voltage power supply, comprising a control module, an EMC filter module, and a DC-DC conversion module, characterized in that: The control module is connected to the EMC filter module and the DC-DC conversion module. The EMC filter module is used to remove the electromagnetic interference of the AC power signal and feed back the AC power signal after EMC filtering to the control module. The DC-DC conversion module is used to feed back the required voltage and convert the DC power signal fed back by the control module. The control module is used to rectify and filter the AC power and further remove its pulsating components based on this power supply. At the same time, the control module adaptively adjusts the pure DC power output of its gain based on the required voltage of the DC-DC conversion module.

2. The EMC control circuit of the plasma surgical knife pulse high voltage source according to claim 1, characterized in that: It also includes a first transformer, a first rectifier bridge, a second voltage-stabilizing diode, a first capacitor, and a fourth resistor; The primary winding of the first transformer is used to receive an AC power signal, the secondary winding of the first transformer is connected to the input end of the first rectifier bridge, the output end of the first rectifier bridge is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to the anode of the second Zener diode, and the other end of the first capacitor, the cathode of the second Zener diode and the ground end are connected.

3. The EMC control circuit of the plasma surgical knife pulse high voltage source according to claim 2, characterized in that: Also includes a third digital potentiometer, a first triode, a tenth resistor, an eleventh resistor, a twelfth resistor, a fourteenth resistor, and a fifteenth resistor; The third pin of the third digital potentiometer is connected to the collector of the first transistor and one end of the twelfth resistor, the eleventh pin of the third digital potentiometer, the twelfth pin of the third digital potentiometer and one end of the tenth resistor are connected, the base of the first transistor and one end of the eleventh resistor are connected, the emitter of the first transistor and one end of the fourteenth resistor and one end of the fifteenth resistor are connected, the other end of the tenth resistor is connected to the anode of the second voltage regulator diode, the other end of the fifteenth resistor is connected to the output end of the first rectifier bridge, the sixth pin of the third digital potentiometer, the tenth pin of the third digital potentiometer, the fourteenth pin of the third digital potentiometer, the other end of the eleventh resistor, the other end of the twelfth resistor, the other end of the fourteenth resistor and the ground are connected.

4. The EMC control circuit of the plasma surgical knife pulse high voltage source according to claim 2, characterized in that: It also includes a first operational amplifier, a second operational amplifier, a fifth operational amplifier, a second resistor, a third resistor, an eighth resistor, a ninth resistor, a thirteenth resistor, and a first connector; The non-inverting end of the first operational amplifier is connected to one end of the tenth resistor, the inverting end of the first operational amplifier is connected to one end of the thirteenth resistor, the output end of the first operational amplifier is connected to one end of the second resistor, one end of the ninth resistor, and the other end of the thirteenth resistor, the non-inverting end of the second operational amplifier is connected to one end of the third resistor and the output end of the fifth operational amplifier, the inverting end of the second operational amplifier is connected to one end of the eighth resistor and the other end of the ninth resistor, the output end of the second operational amplifier is connected to the other end of the eighth resistor and the first connector end, the non-inverting end of the fifth operational amplifier is connected to the anode of the second zener diode, the inverting end of the fifth operational amplifier is connected to the other end of the third resistor, and the other end of the second resistor is connected to the ground end.

5. The EMC control circuit of the plasma surgical knife pulse high voltage source according to claim 3, characterized in that: Also includes a fourth operational amplifier, a sixth operational amplifier, a third diode, a first resistor, a fifth resistor, a seventh resistor, a sixteenth resistor, and a second connector; The fourth operational amplifier has a common-phase end connected to the first connector end, an inverting end connected to one end of the first resistor and the second connector end, an output end of the fourth operational amplifier connected to the fifth pin of the third digital potentiometer and one end of the sixteenth resistor, a common-phase end of the sixth operational amplifier connected to one end of the fourteenth resistor, an inverting end of the sixth operational amplifier connected to one end of the fifth resistor, an output end of the sixth operational amplifier connected to the anode of the third diode and one end of the seventh resistor, a cathode of the third diode connected to the base of the first transistor, and the other end of the first resistor, the other end of the fifth resistor, the other end of the seventh resistor, the other end of the sixteenth resistor and the ground end are connected.

6. The EMC control circuit of the plasma surgical knife pulse high voltage source according to claim 5, characterized in that: It also includes a second triode, a third triode, a sixth resistor, and a third connector; The base of the second transistor is connected to the second connector end, the emitter of the second transistor is connected to one end of the sixth resistor, the collector of the second transistor is connected to the base of the third transistor, the emitter of the third transistor is connected to the output end of the fourth operational amplifier, the collector of the third transistor is connected to the inverting end of the sixth operational amplifier and the third connector end, and the other end of the sixth resistor is connected to the ground end.

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