Charging method of electrostatic collection board

Abstract

The invention relates to a charging method of an electrostatic collection board, which comprises the following steps that the electrostatic collection board comprises an inner layer board and an outer layer board, the inner layer board and the outer layer board are both metal plates, the inner layer board and the outer layer board form a capacitor, the outer layer board is electrically connected with a relay, the relay is respectively connected with a + / -1000V charging circuit, the outer layer board is provided with a conductive carrier, and the conductive carrier is connected with the outer layer board. The conductive carrier is used for collecting electrostatic charges; the inner layer plate is electrically connected with the active detection circuit; the outer layer plate is charged through the charging circuit, and the on-off of a circuit between the charging circuit and the outer layer plate is switched through the relay; meanwhile, induced charges are generated on the inner layer plate, induced voltage is generated, and the induced voltage is actual voltage. According to the scheme that the outer layer plate of the electrostatic collection plate is charged and the active detection circuit is connected to the inner layer plate, the charging voltage on the outer layer plate can be more accurate, the detection result of the decay time can be more accurate, and the collected static electricity can be used for charging equipment or providing electrostatic protection.

Description

Technical Field

[0001] The invention relates to the technical field of electronic measurement, and in particular to a charging method for a static electricity collection plate. Background Art

[0002] In the development and production process of electronic products, the prevention and elimination of static electricity is of vital importance. In the prior art, an ion blower is often used to eliminate static electricity. When the ion blower is in use, it is necessary to test the performance of the ion blower through an electrostatic tester, wherein the decay time and equilibrium voltage of the ion blower are two core parameters. At present, when performing decay time detection, it is necessary to charge the static electricity collection board through an electrostatic tester, for example, charge the voltage of the static electricity collection board to +1000V or -1000V, then turn on the ion blower, the ion blower blows out ionized wind, collects the ions in the wind blown out by the ion blower through the electrostatic collection board, neutralizes the charge on the static electricity collection board, and measures the time for the voltage of the static electricity collection board to drop from +1000V or -1000V to +100V or -100V, which is the decay time of the ion blower. In the prior art, when charging the static electricity collection board, the charge is usually charged to the inner plate of the static electricity collection board, and an induced charge is generated on the outer plate of the static electricity collection board, and then the ions in the wind blown out by the ion blower are collected through the outer plate. The disadvantage of this solution is that because the inner and outer boards of the electrostatic collection board are connected to different circuits, the inner board is connected to the power supply, so the voltage on the inner board is real voltage, and the charge on the outer board is induced charge. If charging is performed on the inner board, the charge collected on the outer board cannot be effectively utilized during the detection process, and when performing decay time and equilibrium voltage detection, the detection accuracy is poor because the induced voltage is virtual electricity. Summary of the invention

[0003] The purpose of the present invention is to provide a charging method for an electrostatic collection plate in order to address the problems in the prior art described in the background technology that when an electrostatic collection plate is charged by an electrostatic meter, charging is usually performed on the inner plate, and induced charges are obtained on the outer plate. When the decay time and equilibrium voltage of the ion fan are detected by the induced charges, the detection accuracy is poor and the collected charges cannot be effectively utilized.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: A charging method for a static electricity collection plate comprises the following steps: The following steps are involved: S1. The electrostatic collection board includes an inner plate and an outer plate. Both the inner plate and the outer plate are metal plates. The inner plate and the outer plate form a capacitor. The outer plate is electrically connected to a relay. The relays are respectively connected to a ±1000V charging circuit. A conductive carrier is provided on the outer plate. The conductive carrier is used to collect electrostatic charges. The inner plate is electrically connected to an active detection circuit. S2, charging the outer plate through the charging circuit, switching the circuit between the charging circuit and the outer plate through the relay; at the same time, generating induced charge on the inner plate, generating induced voltage, which is the actual voltage; S3. When performing balanced voltage detection on the electrostatic device, electrostatic charges are collected through the conductive carrier on the outer plate, and the collected electrostatic charges are stored in the electrostatic storage module. The collected electrostatic charges are used to charge the device and provide electrostatic protection.

[0005] In the above scheme, in step S2, a PWM wave is generated by a single chip microcomputer, and the output voltage of the ±1000V charging circuit is accurately controlled by adjusting the PWM waveform to meet different test requirements.

[0006] In the above scheme, in step S2, voltage switching is performed through a relay to avoid the generation of leakage current during the charging process.

[0007] In the above scheme, the +1000V charging circuit includes a transformer E1, a MOS switch tube Q1 and a four-fold positive voltage circuit. The transformer E1 plays a role of positive voltage conversion in the circuit, and converts the input low voltage into the required positive high voltage through the principle of electromagnetic induction; the MOS switch tube Q1 serves as a front-end driving element of the transformer E1, and adjusts the primary current of the transformer by controlling its switching state, thereby controlling the output voltage of the transformer, and a gate resistor R4 is connected between the gate and the source of the MOS switch tube Q1; the gate of the MOS switch tube Q1 is connected to the PWM signal input end through the resistor R3, the drain of the MOS switch tube Q1 is connected to the signal input end of the transformer E1, the positive voltage input end of the transformer E1 is connected to the positive voltage, the ground end of the transformer E1 is grounded, the output end of the transformer E1 is connected to the four-fold positive voltage circuit, the output end of the four-fold positive voltage circuit is connected to the positive high voltage output end resistor R2, and the output end of the positive high voltage output end resistor R2 is the output end of the +1000V charging circuit. Through this setting, the MOS switch tube Q1 controls its switching state to adjust the primary current of the transformer, thereby controlling the output voltage of the transformer. The transformer E1 converts the input low voltage into the required positive high voltage. The gate resistor R4 is used to limit the gate current to protect the gate of the MOS tube from high voltage shocks and ensure the fast switching of the MOS tube. The positive high-voltage output terminal resistor R2 is used to limit the output current to protect the subsequent circuit from excessive current shocks.

[0008] In the above scheme, the +1000V charging circuit also includes an RCD absorption circuit, which includes a resistor R5, a capacitor C3 and a diode D4. The anode of the diode D4 is connected to the drain of the MOS switch tube Q1. The resistor R5 and the capacitor C3 are connected in parallel. One end of the parallel circuit is connected in series with the cathode of the diode D4, and the other end is connected to the positive voltage input terminal of the transformer E1. Through this setting, the RCD circuit can be used to absorb the voltage spike generated when the MOS tube Q1 is turned off, reduce voltage stress, and protect the MOS tube from damage. The combination of R5 and C3 helps to reduce switching noise.

[0009] In the above scheme, the +1000V charging circuit also includes a fast discharge circuit, which includes a resistor R1 and a diode D3. The resistor R1 and the diode D3 are connected in series, and the branch formed is connected in parallel with the resistor R3. The anode of the diode D3 is connected to the PWM signal input terminal, and the cathode of the diode D3 is connected to the resistor R1. Through this setting, when Q1 is turned off, the circuit formed by the resistor R1 and the diode D3 can quickly discharge the charge on the MOS tube, accelerate the turn-off process of the MOS tube, and reduce energy loss.

[0010] In the above scheme, the four-fold positive voltage circuit includes a diode D1, a diode D2, a capacitor C1 and a capacitor C2, one end of the capacitor C1 is grounded, and the other end is respectively connected to the cathode of the diode D1 and the anode of the diode D2, the anode of the diode D1 is connected to the output end of the transformer E1, the cathode of the diode D2 is connected to the positive high voltage output terminal resistor R2, and the two ends of the capacitor C2 are respectively connected to the output end of the transformer E1 and the positive high voltage output terminal resistor R2. Through this setting, D1 and D2 act as diodes to ensure that the current flows in one direction, and C1 and C2 act as energy storage elements to store and release energy. The four-fold positive voltage circuit can achieve voltage doubling through the charging and discharging process of the capacitor, thereby generating the required positive high voltage.

[0011] In the above scheme, the -1000V charging circuit includes a transformer E2, a MOS switch tube Q2 and a four-fold negative voltage circuit. The transformer E2 plays a role of negative voltage conversion in the circuit, and converts the input low voltage into the required negative high voltage through the principle of electromagnetic induction; the MOS switch tube Q2 is used as the front-end driving element of the transformer E2, and adjusts the primary current of the transformer by controlling its switching state, thereby controlling the output voltage of the transformer. A gate resistor R9 is connected between the gate and source of the MOS switch tube Q2; the gate of the MOS switch tube Q2 is connected to the PWM signal input end through the resistor R8, the drain of the MOS switch tube Q2 is connected to the signal input end of the transformer E2, the negative voltage input end of the transformer E2 is connected to the negative voltage, the ground end of the transformer E2 is grounded, the output end of the transformer E2 is connected to the four-fold negative voltage circuit, the output end of the four-fold negative voltage circuit is connected to the negative high voltage output end resistor R6, and the output end of the negative high voltage output end resistor R6 is the output end of the -1000V charging circuit. The principle of the -1000V charging circuit is similar to that of the +1000V charging circuit, and the only difference is that the transformer is connected to a negative high voltage.

[0012] In the above scheme, the -1000V charging circuit also includes an RCD absorption circuit, which includes a resistor R10, a capacitor C6 and a diode D8, the anode of the diode D8 is connected to the drain of the MOS switch tube Q2, the resistor R10 and the capacitor C6 are connected in parallel, one end of the parallel circuit is connected in series with the cathode of the diode D8, and the other end is connected to the positive voltage input terminal of the transformer E2. The principle of the RCD absorption circuit of the -1000V charging circuit is the same as that of the +1000V charging circuit.

[0013] In the above scheme, the four-fold negative voltage circuit includes a diode D6, a diode D7, a capacitor C4 and a capacitor C5, one end of the capacitor C4 is grounded, and the other end is connected to the negative high voltage output terminal resistor R6, the ground end of the capacitor C4 is connected to the cathode of the diode D6, the other end of the capacitor C4 is connected to the anode of the diode D7, the anode of the diode D6 and the cathode of the diode D7 are connected to one end of the capacitor C5, and the other end of the capacitor C5 is connected to the output end of the transformer E2. Through this arrangement, D6 and D7 act as diodes to ensure that the current flows in one direction, and C4 and C5 act as energy storage elements to store and release energy. The four-fold negative voltage circuit can achieve voltage doubling through the charging and discharging process of the capacitor, thereby generating the required negative high voltage.

[0014] The present invention has positive effects: 1) The charging method of the electrostatic collection board of the present invention charges the outer plate of the electrostatic collection board through a charging circuit. After charging to a predetermined voltage, the charging circuit is disconnected by a relay, and the decay time detection of the ion blower can be started. Because the charging is performed by a charging circuit, compared with the scheme of charging the inner plate and generating induced charge on the outer plate in the prior art, the voltage charged on the outer plate can be made more precise, and the decay time detection result can be made more accurate. 2) The charging method of the electrostatic collection board of the present invention, when performing balanced voltage detection on the ion blower, the static electricity collected by the outer plate of the electrostatic collection board can be stored in the static electricity storage module. In subsequent applications, this part of the static electricity can be used to charge the equipment or provide static electricity protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The schematic diagram is a schematic diagram of the charging method of the electrostatic collection plate of the present invention.

[0016] Figure 2 It is a circuit principle diagram of the +1000V charging circuit of the present invention.

[0017] Figure 3 It is a circuit principle diagram of the -1000V charging circuit of the present invention. DETAILED DESCRIPTION

[0018] The technical scheme of the present invention is clearly and completely described below through embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figure 1 As shown, the charging method of the electrostatic collection plate of the present invention comprises the following steps: The following steps are involved: S1. The electrostatic collection board includes an inner plate and an outer plate. Both the inner plate and the outer plate are metal plates. The inner plate and the outer plate form a capacitor. The outer plate is electrically connected to a relay. The relays are respectively connected to a ±1000V charging circuit. A conductive carrier is provided on the outer plate. The conductive carrier is used to collect electrostatic charges. The inner plate is electrically connected to an active detection circuit. S2. Charge the outer board through the charging circuit. When charging the outer board, generate PWM wave through the single chip microcomputer. Accurately control the output voltage of ±1000V charging circuit through PWM waveform adjustment to meet different test requirements; switch the circuit between the charging circuit and the outer board through the relay, and also switch the voltage through the relay to avoid leakage current during charging; while charging the outer board, generate induced charge on the inner board and generate induced voltage. Because the inner board is connected to the active circuit, the induced voltage is the actual voltage; S3. When performing balanced voltage detection on the electrostatic device, electrostatic charges are collected through the conductive carrier on the outer plate, and the collected electrostatic charges are stored in the electrostatic storage module. The collected electrostatic charges are used to charge the device and provide electrostatic protection.

[0020] like Figure 2 As shown, in step S2, the +1000V charging circuit includes a transformer E1, a MOS switch tube Q1 and a four-fold positive voltage circuit. The transformer E1 plays a role of positive voltage conversion in the circuit, and converts the input low voltage into the required positive high voltage through the principle of electromagnetic induction; the MOS switch tube Q1 is used as a front-end driving element of the transformer E1, and adjusts the primary current of the transformer by controlling its switching state, thereby controlling the output voltage of the transformer, and a gate resistor R4 is connected between the gate and the source of the MOS switch tube Q1; the gate of the MOS switch tube Q1 is connected to the PWM signal input end through the resistor R3, the drain of the MOS switch tube Q1 is connected to the signal input end of the transformer E1, the positive voltage input end of the transformer E1 is connected to the positive voltage, the ground end of the transformer E1 is grounded, the output end of the transformer E1 is connected to the four-fold positive voltage circuit, the output end of the four-fold positive voltage circuit is connected to the positive high voltage output end resistor R2, and the output end of the positive high voltage output end resistor R2 is the output end of the +1000V charging circuit. Through this setting, the MOS switch tube Q1 controls its switching state to adjust the primary current of the transformer, thereby controlling the output voltage of the transformer. The transformer E1 converts the input low voltage into the required positive high voltage. The gate resistor R4 is used to limit the gate current to protect the gate of the MOS tube from high voltage shocks and ensure the fast switching of the MOS tube. The positive high-voltage output terminal resistor R2 is used to limit the output current to protect the subsequent circuit from excessive current shocks.

[0021] The four-fold positive voltage circuit includes a diode D1, a diode D2, a capacitor C1 and a capacitor C2. One end of the capacitor C1 is grounded, and the other end is connected to the cathode of the diode D1 and the anode of the diode D2 respectively. The anode of the diode D1 is connected to the output end of the transformer E1, the cathode of the diode D2 is connected to the positive high voltage output terminal resistor R2, and the two ends of the capacitor C2 are connected to the output end of the transformer E1 and the positive high voltage output terminal resistor R2 respectively. Through this setting, D1 and D2 act as diodes to ensure that the current flows in one direction, and C1 and C2 act as energy storage elements to store and release energy. The four-fold positive voltage circuit can achieve voltage doubling through the charging and discharging process of the capacitor, thereby generating the required positive high voltage.

[0022] Preferably, the +1000V charging circuit further includes an RCD absorption circuit, which includes a resistor R5, a capacitor C3 and a diode D4, wherein the anode of the diode D4 is connected to the drain of the MOS switch tube Q1, the resistor R5 and the capacitor C3 are connected in parallel, one end of the parallel circuit is connected in series with the cathode of the diode D4, and the other end is connected to the positive voltage input terminal of the transformer E1. Through this arrangement, the RCD circuit can be used to absorb the voltage spike generated when the MOS tube Q1 is turned off, reduce voltage stress, and protect the MOS tube from damage. The combination of R5 and C3 helps to reduce switching noise.

[0023] Preferably, the +1000V charging circuit further includes a fast discharge circuit, which includes a resistor R1 and a diode D3, wherein the resistor R1 and the diode D3 are connected in series, and the formed branch is connected in parallel with the resistor R3, wherein the anode of the diode D3 is connected to the PWM signal input terminal, and the cathode of the diode D3 is connected to the resistor R1. Through this arrangement, when Q1 is turned off, the circuit formed by the resistor R1 and the diode D3 can quickly discharge the charge on the MOS tube, accelerate the turn-off process of the MOS tube, and reduce energy loss.

[0024] like Figure 3As shown, the -1000V charging circuit includes a transformer E2, a MOS switch tube Q2 and a four-fold negative voltage circuit. The transformer E2 plays a role of negative voltage conversion in the circuit, and converts the input low voltage into the required negative high voltage through the principle of electromagnetic induction; the MOS switch tube Q2 is used as the front-end driving element of the transformer E2, and adjusts the primary current of the transformer by controlling its switching state, thereby controlling the output voltage of the transformer. A gate resistor R9 is connected between the gate and source of the MOS switch tube Q2; the gate of the MOS switch tube Q2 is connected to the PWM signal input end through the resistor R8, the drain of the MOS switch tube Q2 is connected to the signal input end of the transformer E2, the negative voltage input end of the transformer E2 is connected to the negative voltage, the ground end of the transformer E2 is grounded, the output end of the transformer E2 is connected to the four-fold negative voltage circuit, the output end of the four-fold negative voltage circuit is connected to the negative high voltage output end resistor R6, and the output end of the negative high voltage output end resistor R6 is the output end of the -1000V charging circuit. The principle of the -1000V charging circuit is similar to that of the +1000V charging circuit, and the only difference is that the transformer is connected to a negative high voltage.

[0025] The four-fold negative voltage circuit includes a diode D6, a diode D7, a capacitor C4 and a capacitor C5. One end of the capacitor C4 is grounded, and the other end is connected to the negative high voltage output terminal resistor R6. The ground end of the capacitor C4 is connected to the cathode of the diode D6, and the other end of the capacitor C4 is connected to the anode of the diode D7. The anode of the diode D6 and the cathode of the diode D7 are connected to one end of the capacitor C5, and the other end of the capacitor C5 is connected to the output end of the transformer E2. Through this configuration, D6 and D7 act as diodes to ensure that the current flows in one direction, and C4 and C5 act as energy storage elements to store and release energy. The four-fold negative voltage circuit can achieve voltage doubling through the charging and discharging process of the capacitor, thereby generating the required negative high voltage.

[0026] Preferably, the -1000V charging circuit further includes an RCD absorption circuit, which includes a resistor R10, a capacitor C6 and a diode D8, wherein the anode of the diode D8 is connected to the drain of the MOS switch tube Q2, the resistor R10 and the capacitor C6 are connected in parallel, one end of the parallel circuit is connected in series with the cathode of the diode D8, and the other end is connected to the positive voltage input terminal of the transformer E2. The principle of the RCD absorption circuit of the -1000V charging circuit is the same as that of the +1000V charging circuit.

[0027] Preferably, the -1000V charging circuit may further include a fast discharge circuit, which includes a resistor R7 and a diode D5, wherein the resistor R7 and the diode D5 are connected in series, and the formed branch is connected in parallel with the resistor R8, wherein the anode of the diode D5 is connected to the PWM signal input terminal, and the cathode of the diode D5 is connected to the resistor R7. Through this arrangement, when Q2 is turned off, the circuit formed by the resistor R7 and the diode D5 can quickly discharge the charge on the MOS tube, accelerate the turn-off process of the MOS tube, and reduce energy loss.

[0028] The charging method of the electrostatic collection board of the present invention charges the outer plate of the electrostatic collection board through a charging circuit. After charging to a predetermined voltage, the charging circuit is disconnected by a relay, and the decay time detection of the ion blower can be started. Because the charging is performed by a charging circuit, compared with the scheme of charging the inner plate and generating induced charge on the outer plate in the prior art, the voltage charged on the outer plate can be more accurate, and the decay time detection result can be more accurate. 2) The charging method of the electrostatic collection board of the present invention, when performing balanced voltage detection on the ion blower, the static electricity collected by the outer plate of the electrostatic collection board can be stored in the static electricity storage module. In subsequent applications, this part of the static electricity can be used to charge the equipment or provide static electricity protection.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A charging method for a static electricity collection plate, characterized in that: The following steps are involved: S1. The electrostatic collection board includes an inner plate and an outer plate. Both the inner plate and the outer plate are metal plates. The inner plate and the outer plate form a capacitor. The outer plate is electrically connected to a relay. The relays are respectively connected to a ±1000V charging circuit. A conductive carrier is provided on the outer plate. The conductive carrier is used to collect electrostatic charges. The inner plate is electrically connected to an active detection circuit. S2, charging the outer plate through the charging circuit, switching the circuit between the charging circuit and the outer plate through the relay; at the same time, generating induced charge on the inner plate, generating induced voltage, which is the actual voltage; S3. When performing balanced voltage detection on the electrostatic device, electrostatic charges are collected through the conductive carrier on the outer plate, and the collected electrostatic charges are stored in the electrostatic storage module. The collected electrostatic charges are used to charge the device and provide electrostatic protection.

2. The charging method of the electrostatic collection plate according to claim 1, characterized in that: In step S2, a PWM wave is generated by a single chip microcomputer, and the output voltage of the ±1000V charging circuit is accurately controlled by adjusting the PWM waveform to meet different test requirements.

3. The charging method of the electrostatic collection plate according to claim 1, characterized in that: In step S2, voltage switching is performed through a relay to avoid leakage current during charging.

4. The charging method of the electrostatic collection plate according to claim 1, characterized in that: The +1000V charging circuit includes a transformer E1, a MOS switch tube Q1 and a four-fold positive voltage circuit. The transformer E1 plays a role of positive voltage conversion in the circuit, and converts the input low voltage into the required positive high voltage through the principle of electromagnetic induction; the MOS switch tube Q1 serves as a front-end driving element of the transformer E1, and adjusts the primary current of the transformer by controlling its switching state, thereby controlling the output voltage of the transformer, and a gate resistor R4 is connected between the gate and the source of the MOS switch tube Q1; the gate of the MOS switch tube Q1 is connected to the PWM signal input end through the resistor R3, the drain of the MOS switch tube Q1 is connected to the signal input end of the transformer E1, the positive voltage input end of the transformer E1 is connected to the positive voltage, the ground end of the transformer E1 is grounded, the output end of the transformer E1 is connected to the four-fold positive voltage circuit, the output end of the four-fold positive voltage circuit is connected to the positive high-voltage output end resistor R2, and the output end of the positive high-voltage output end resistor R2 is the output end of the +1000V charging circuit.

5. The charging method of the electrostatic collection plate according to claim 4, characterized in that: The +1000V charging circuit also includes an RCD absorption circuit, which includes a resistor R5, a capacitor C3 and a diode D4. The anode of the diode D4 is connected to the drain of the MOS switch tube Q1. The resistor R5 and the capacitor C3 are connected in parallel. One end of the parallel loop is connected in series with the cathode of the diode D4, and the other end is connected to the positive voltage input end of the transformer E1.

6. The charging method of the electrostatic collection plate according to claim 4, characterized in that: The +1000V charging circuit also includes a fast discharge circuit, which includes a resistor R1 and a diode D3. The resistor R1 and the diode D3 are connected in series to form a branch connected in parallel with the resistor R3. The anode of the diode D3 is connected to the PWM signal input terminal, and the cathode of the diode D3 is connected to the resistor R1.

7. The charging method of the electrostatic collection plate according to claim 4, characterized in that: The quadruple voltage positive circuit includes a diode D1, a diode D2, a capacitor C1 and a capacitor C2, one end of the capacitor C1 is grounded, and the other end is respectively connected to the cathode of the diode D1 and the anode of the diode D2, the anode of the diode D1 is connected to the output end of the transformer E1, the cathode of the diode D2 is connected to the positive high voltage output end resistor R2, and the two ends of the capacitor C2 are respectively connected to the output end of the transformer E1 and the positive high voltage output end resistor R2.

8. The charging method of the electrostatic collection plate according to claim 1, characterized in that: The -1000V charging circuit includes a transformer E2, a MOS switch tube Q2 and a four-fold negative voltage circuit. The transformer E2 plays a role of negative voltage conversion in the circuit, and converts the input low voltage into the required negative high voltage through the principle of electromagnetic induction; the MOS switch tube Q2 serves as a front-end driving element of the transformer E2, and adjusts the primary current of the transformer by controlling its switching state, thereby controlling the output voltage of the transformer, and a gate resistor R9 is connected between the gate and the source of the MOS switch tube Q2; the gate of the MOS switch tube Q2 is connected to the PWM signal input end through the resistor R8, the drain of the MOS switch tube Q2 is connected to the signal input end of the transformer E2, the negative voltage input end of the transformer E2 is connected to the negative voltage, the ground end of the transformer E2 is grounded, the output end of the transformer E2 is connected to the four-fold negative voltage circuit, the output end of the four-fold negative voltage circuit is connected to the negative high-voltage output end resistor R6, and the output end of the negative high-voltage output end resistor R6 is the output end of the -1000V charging circuit.

9. The charging method of the electrostatic collection plate according to claim 8, characterized in that: The -1000V charging circuit also includes an RCD absorption circuit, which includes a resistor R10, a capacitor C6 and a diode D8. The anode of the diode D8 is connected to the drain of the MOS switch tube Q2. The resistor R10 and the capacitor C6 are connected in parallel. One end of the parallel loop is connected in series with the cathode of the diode D8, and the other end is connected to the positive voltage input end of the transformer E2.

10. The charging method of the electrostatic collection plate according to claim 8, characterized in that: The quadruple voltage negative circuit includes a diode D6, a diode D7, a capacitor C4 and a capacitor C5, one end of the capacitor C4 is grounded, and the other end is connected to the negative high voltage output terminal resistor R6, the ground end of the capacitor C4 is connected to the cathode of the diode D6, the other end of the capacitor C4 is connected to the anode of the diode D7, the anode of the diode D6 and the cathode of the diode D7 are connected to one end of the capacitor C5, and the other end of the capacitor C5 is connected to the output end of the transformer E2.

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