CN209642567U - Nanosecond pulse power supply controlled by silicon controlled rectifier - Google Patents

Abstract

The utility model belongs to the pulse power supply field, concretely relates to nanosecond pulse power supply by silicon controlled rectifier control. The utility model provides a nanosecond pulse power supply by silicon controlled rectifier control that stable, high-efficient, voltage loss are little. The utility model provides a nanosecond pulse power supply by silicon controlled rectifier control, includes fundamental wave circuit, corona wire and dust collector, its characterized in that still includes: the input end of the pulse pre-booster circuit is connected with three alternating currents to convert the alternating currents into pulse currents; the primary side of the three-phase transformer is electrically connected with the pulse preposed boosting circuit to boost the voltage; the pulse rectification filter circuit is electrically connected with the secondary side of the three-phase transformer and rectifies the alternating current into direct current; the pulse energy storage generating circuit is electrically connected with the pulse rectifying and filtering circuit and converts the width of the direct current pulse to microsecond level; and the primary side of the pulse boosting transformer is electrically connected with the pulse energy storage generating circuit and boosts the voltage in the pulse energy storage circuit.

Description

A Nanosecond Pulse Power Supply Controlled by Thyristor

technical field

The utility model belongs to the field of pulse power supply, and in particular relates to a nanosecond-level pulse power supply controlled by a thyristor.

Background technique

Pulse power technology is a subject technology that rapidly releases energy stored in a relatively long period of time in a short period of time. Pulse power technology is already a very widely used technology. It can generate extremely high voltage and high temperature in a short period of time. It can accelerate particles to a high speed and generate great force. It can also detect the target at a long distance, etc. In industry, pulse power technology is used to treat waste gas and wastewater, VOC treatment, electrostatic dust removal, desulfurization, ozone generation, and food preservation. As we all know, the basic principle of pulse power technology is: energy (E) is equal to power (P) multiplied by power action time (t), that is: E=Pt; it can be seen that when the energy is constant, shortening the time (pulse compression) is Power can be increased. However, the current pulse power supply technology mostly adopts the topology structure of switching devices and pulse transformers. The high-voltage pulse width generated by the pulse power supply with this structure is generally between tens of microseconds and hundreds of microseconds. According to the basic principle of pulse power technology, if the pulse width can be reduced to hundreds of nanoseconds or even smaller, then higher instantaneous power can be output, so as to better play the characteristics of the load and achieve better application effects . In addition, compared with continuous power supply, pulse power supply is also more energy-saving.

With the improvement of environmental protection emission standards in recent years, ultra-low emissions have been fully implemented after 2015, and some local governments have also introduced ultra-low emission policies or local standards of 5mg/ ^m3 for smoke or particulate matter. Therefore, the pulse power supply has been widely recognized by users because of its unique technical characteristics and advantages. The pulse power supply can not only improve the dust collection efficiency of ESP, but also reduce energy consumption. The pulse power supply has a good effect in the working conditions where the traditional DC power supply is not suitable, such as severe back corona and fine dust with high specific resistance. Therefore, the use of pulse power supply for ESP is the development direction of the power supply for electric precipitators today, and it is also the development trend of the electric precipitator industry.

According to Deutsch ESP efficiency formula: η=1-e- ^fω

In the formula: f——the ratio of A/Q, which is called the specific dust collection area (m ² /m ³ /S).

A——The area of the dust collector plate (m ² )

Q——flue gas volume (m ³ /S)

ω——driving speed (m/S)

It can be seen from the formula:

The higher the driving speed, the higher the dust removal efficiency, and the moving speed is proportional to the product of the average voltage and peak voltage in the electric field, so the higher the average voltage and peak voltage output by the power supply, the better the dust removal effect.

However, due to the limited equipment and technology, it is difficult to make a stable, high-efficiency, and small nanosecond pulse power supply with repeated voltage loss.

Utility model content

In order to solve the above-mentioned existing problems due to limited equipment and technology, it is difficult to make a stable, high-efficiency, and small nanosecond-level pulse power supply with repeated voltage loss, the utility model proposes a stable, high-efficiency, and small SCR-controlled nanosecond pulse power supply.

In order to achieve the above purpose, the technical solution adopted by the utility model is a nanosecond-level pulse power supply controlled by a thyristor, including a fundamental wave circuit, a corona wire and a dust collector, and is characterized in that it also includes: a pulse The pre-boost circuit, the input end is connected to the three-phase AC, and the AC is converted into a pulse current; the three-phase transformer, the primary side is electrically connected to the pulse pre-boost circuit, and the voltage is boosted; the pulse rectification filter circuit, and the three-phase The secondary side of the phase transformer is electrically connected to rectify the AC to DC; the pulse energy storage generating circuit is electrically connected to the pulse rectification filter circuit to convert the width of the DC pulse to the microsecond level; the pulse step-up transformer, the primary side and the pulse energy storage The generating circuit is electrically connected to boost the voltage in the pulse energy storage circuit; the pulse compression circuit is electrically connected to the secondary side of the pulse step-up transformer, and compresses the pulse current at the microsecond level into a pulse current at the nanosecond level; The sampling circuit is electrically connected to the pulse compression circuit; the trigger signal circuit is electrically connected to the pulse pre-boosting circuit, and is electrically connected to the pulse energy storage generating circuit, which is used to control the conduction of the switching device; the coupling circuit is used to convert the fundamental wave current Superimposed and boosted with the nanosecond pulse current, the input end is electrically connected to the fundamental wave circuit and the pulse sampling circuit, and the output end is electrically connected to the corona wire.

Preferably, the pulse pre-boosting circuit uses three bidirectional thyristors to process the input three-phase electricity as pulses.

As a preference, the rectifier bridge used in the pulse rectification filter circuit is composed of three groups of diodes connected in series. Preferably, the pulse energy storage generating circuit uses a two-stage charging and discharging circuit, which completes the work of converting the pulse width to the microsecond level, and at the same time boosts the voltage again.

Preferably, the two thyristors used in the charging and discharging circuit are used as switching devices, and the function of turning off the thyristors is achieved through resonance.

Preferably, the compression device used in the pulse compression circuit is a self-breakdown switch and a Blumlein transmission line; the Blumlein transmission line is a coaxial transmission line.

Preferably, the self-breakdown switch includes: a cylindrical metal casing filled with high-voltage inert gas and grounded; a copper core, one end of which is electrically connected to the secondary side of the pulse step-up transformer, and the other end is inserted into the cylindrical metal casing The insulating piston is installed in the cylindrical metal shell and is slidably connected with the cylindrical metal shell; the center of the insulating piston is provided with a clamping cap, and the clamping cap is fixedly connected with the other end of the copper core; the insulating seal The ring is installed at the entrance and exit of the cylindrical metal shell, between the copper core and the cylindrical metal shell, for insulation and sealing; the insulating air bag is installed in the cylindrical metal shell, located under the insulating piston, and one end is connected to the cylindrical metal shell. The inner bottom of the shell is fixedly connected, and the other end is fixedly connected with the bottom of the insulating piston; several ring-shaped insulating grids are installed in the cylindrical metal shell and fixedly connected with the cylindrical metal shell for arc extinguishing; the gas charging valve passes through the column The cylindrical metal shell is installed on the insulating air bag, and is fixedly connected with the insulating air bag; the copper core is used as an anode, and the cylindrical metal shell is used as a cathode.

Preferably, the filling gas of the self-breakdown switch is sulfur hexafluoride.

As a preference, the circuits of the pulse rectification filter circuit and the pulse energy storage generating circuit are as follows: the U-phase secondary winding on the secondary side of the three-phase transformer is connected to the anode of the diode D3 and connected to the cathode of the diode D6; the secondary winding of the three-phase transformer The V-phase secondary winding on the secondary side of the three-phase transformer is connected to the anode of diode D1 and the cathode of diode D4; the W-phase secondary winding on the secondary side of the three-phase transformer is connected to the anode of diode D2 and the cathode of diode D5; the cathode of diode D1 is connected to The cathode of diode D2 is connected to the cathode of diode D3, and connected to the first end of capacitor C1; the anode of diode D4 is connected to the anode of diode D5 and the anode of diode D6, and connected to the second segment of capacitor C1; the first end of capacitor C1 connected to the first end of the inductor L1, the second end of the inductor L1 is connected to the anode of the thyristor K1, the cathode of the thyristor K1 is connected to the first end of the capacitor C2, and the first end of the capacitor C2 is connected to the first end of the inductor L2 , the second section of the inductor L2 is connected to the anode of the thyristor K2, the cathode of the thyristor K2 is connected to the second end of the capacitor C2, the second section of the capacitor C2 is connected to the second section of the capacitor C1; the inductor L2 is the pulse step-up transformer primary side.

Preferably, the circuits of the pulse compression circuit and the pulse sampling circuit are as follows: the first end of the secondary side of the pulse step-up transformer is connected to the anode of the self-breakdown switch, and the second section of the secondary side of the pulse step-up transformer It is connected to the cathode of the self-breakdown switch, and the cathode of the self-breakdown switch is grounded; the axis of the Blumlein transmission line B1 is connected to the anode of the self-breakdown switch, and the surface line of the Blumlein transmission line B1 is connected to the cathode of the self-breakdown switch; the Blumlein transmission line B2 The axis is connected to the axis of the Blumlein transmission line B1, the first end of the resistor R1 is connected to the surface line of the Blumlein transmission line B1, the second end of the resistor R1 is connected to the surface line of the Blumlein transmission line B2; the first end of the capacitor C3 is connected to the Blumlein transmission line B2 The axis connection, the second end of the capacitor C3 is connected to the first end of the resistor R3; the second end of the capacitor C3 is connected to the coupling circuit; the second end of the resistor R3 is connected to the first end of the resistor R4, and the second end of the resistor R4 terminal grounding; the first end of the resistor R2 is connected to the surface wire of the Blumlein transmission line B2, the second end of the resistor R2 is connected to the second end of the resistor R4, and the second end of the resistor R4 is connected to the dust collector.

Beneficial effects of the present utility model: (1) There are many kinds of pulse compression methods. At present, the magnetic switch is mostly used, but the magnetic switch is inconvenient to use, and the efficiency of the demagnetization circuit is low and the voltage loss is large. The Blumlein transmission line and the The gas switch, the Blumlein transmission line voltage is high, and the gas switch has a fast turn-on time, but the insulation recovery time of the gas switch limits the repetition frequency of the power supply; so the utility model improves the self-breakdown switch, adding sulfur hexafluoride and insulation The grid plate is used to reduce the insulation recovery time of the gas switch, so that its repetition frequency meets the use of the circuit; (2) In the pulse energy storage generation circuit, the IGBT is usually the first choice, although the IGBT frequency is higher and the power is larger, but for The over-current and over-voltage capabilities are poor, and it is easy to burn out. Compared with the thyristor, it is expensive, and there is no need for fully controllable devices here. The soft switching technology can be realized by using the resonance of the inductance and capacitance. When the current is zero, it is semi-reliable The thyristor of the control device can be turned off automatically, waiting for the next discharge. The advantages of thyristors are large power, strong overcurrent and overvoltage capabilities, not easy to burn out, no need for complicated protection circuits, and simple driving, no need for special driver chips, economical and practical, and reduced conduction voltage; (3) The utility model The internal air pressure of the self-breakdown switch mentioned in the above can be adjusted to make the output more stable; (4) the utility model chooses the Blumlein transmission line to compress the pulse, and the Blumlein transmission line is often used for pulse compression, usually consisting of one or two transmission lines. The pulse voltage obtained by the transmission line is half of the charging voltage, and the pulse voltage obtained by the two transmission lines is equal to the charging voltage, which reduces the voltage loss.

Description of drawings

Figure 1: A circuit diagram of a nanosecond pulse power supply controlled by a thyristor

Figure 2: Schematic diagram of the structure of a self-breakdown switch

In the figure: 1. Pulse pre-boost circuit, 2. Three-phase transformer, 3. Pulse rectification filter circuit, 4. Pulse energy storage generating circuit, 5. Pulse step-up transformer, 6. Pulse compression circuit, 7. Pulse sampling Circuit, 8. Cylindrical metal shell, 9. Annular insulating grid plate, 10. Copper core, 11. Insulating sealing ring, 12. Insulating piston, 13. Insulating air bag, 14. Inflatable valve.

Detailed ways

A nanosecond-level pulse power supply controlled by a silicon controlled rectifier, including a fundamental wave circuit, a corona wire, and a dust collector, is characterized in that it also includes: a pulse pre-boosting circuit 1, and the input end is connected to a three-phase alternating current, Convert alternating current into pulsed current; the primary side of the three-phase transformer 2 is electrically connected to the pulse pre-boosting circuit 1 to boost the voltage; the pulse rectification filter circuit 3 is electrically connected to the secondary side of the three-phase transformer 2 to convert the alternating current The rectification is direct current; the pulse energy storage generating circuit 4 is electrically connected with the pulse rectification filter circuit 3, and the width of the DC pulse is converted to microsecond level; the pulse step-up transformer 5 is electrically connected with the pulse energy storage generating circuit 4 on the primary side, and the The voltage in the pulse energy storage circuit is boosted; the pulse compression circuit 6 is electrically connected to the secondary side of the pulse step-up transformer 5, and the pulse current of the microsecond level is compressed into a pulse current of the nanosecond level; the pulse sampling circuit 7, It is electrically connected to the pulse compression circuit 6; the trigger signal circuit is electrically connected to the pulse pre-boosting circuit 1, and is electrically connected to the pulse energy storage generating circuit 4, which is used to control the conduction of the switching device; the coupling circuit is used to convert the fundamental wave current Superimposed and boosted with the nanosecond pulse current, the input end is electrically connected to the fundamental wave circuit and the pulse sampling circuit 7, and the output end is electrically connected to the corona wire.

The pulse pre-boosting circuit 1 uses three bidirectional thyristors to perform pulse processing on the input three-phase power. The rectifying bridge adopted by the pulse rectifying and filtering circuit 3 is composed of 3 groups of diodes connected in series.

The pulse energy storage generating circuit 4 adopts a two-stage charging and discharging circuit, completes the work of converting the pulse width to microsecond level, and also boosts the voltage again.

The two thyristors used in the charging and discharging circuit are used as switching devices, and the function of turning off the thyristors is achieved through resonance.

The compression device used in the pulse compression circuit 6 is a self-breakdown switch and a Blumlein transmission line; the Blumlein transmission line is a coaxial transmission line.

The self-breakdown switch includes: a cylindrical metal shell 8 filled with high-pressure inert gas and grounded; a copper core 10, one end electrically connected to the secondary side of the pulse step-up transformer 5, and the other end inserted into the cylindrical metal shell 8 middle; the insulating piston 12 is installed in the cylindrical metal shell 8 and is slidably connected with the cylindrical metal shell 8; the center of the insulating piston 12 is provided with a snap-fit cap, and the snap-fit cap is connected with another part of the copper core 10 One end is fixedly connected; the insulating sealing ring 11 is installed at the entrance and exit of the cylindrical metal casing 8, and is located between the copper core 10 and the cylindrical metal casing 8 for insulation and sealing; the insulating air bag 13 is installed on the cylindrical metal casing 8 Inside, located below the insulating piston 12, one end is fixedly connected to the inner bottom of the cylindrical metal casing 8, and the other end is fixedly connected to the bottom of the insulating piston 12; several annular insulating grid plates 9 are installed in the cylindrical metal casing 8, and are connected to the column Shaped metal shell 8 is fixedly connected for arc extinguishing; the charging valve 14 is installed on the insulating air bag 13 through the cylindrical metal shell 8, and is fixedly connected with the insulating air bag 13; the copper core 10 is used as an anode, and the cylindrical metal shell 8 as the cathode.

The filling gas of the self-breakdown switch is sulfur hexafluoride.

The circuit of described pulse rectification filter circuit 3 and pulse energy storage generating circuit 4 is: the U-phase secondary winding of three-phase transformer 2 secondary side is connected with the anode of diode D3, is connected with the cathode of diode D6; The V-phase secondary winding on the secondary side is connected to the anode of diode D1 and the cathode of diode D4; the W-phase secondary winding on the secondary side of three-phase transformer 2 is connected to the anode of diode D2 and the cathode of diode D5; the diode D1’s The cathode is connected to the cathode of the diode D2 and the cathode of the diode D3, and connected to the first end of the capacitor C1; the anode of the diode D4 is connected to the anode of the diode D5 and the anode of the diode D6, and connected to the second segment of the capacitor C1; the capacitor C1 The first end is connected to the first end of the inductor L1, the second end of the inductor L1 is connected to the anode of the thyristor K1, the cathode of the thyristor K1 is connected to the first end of the capacitor C2, and the first end of the capacitor C2 is connected to the first end of the inductor L2. The second section of the inductor L2 is connected to the anode of the thyristor K2, the cathode of the thyristor K2 is connected to the second end of the capacitor C2, and the second section of the capacitor C2 is connected to the second section of the capacitor C1; the inductor L2 is a pulse boost Primary side of transformer 5.

The circuit of described pulse compression circuit 6 and pulse sampling circuit 7 is: the first end of the secondary side of pulse step-up transformer 5 is connected with the anode of self-breakdown switch, the second end of the secondary side of pulse step-up transformer 5 The segment is connected to the cathode of the self-breakdown switch, and the cathode of the self-breakdown switch is grounded; the axis of the Blumlein transmission line B1 is connected to the anode of the self-breakdown switch, and the surface line of the Blumlein transmission line B1 is connected to the cathode of the self-breakdown switch; Blumlein transmission line B2 The axis of the resistor R1 is connected to the axis of the Blumlein transmission line B1, the first end of the resistor R1 is connected to the surface line of the Blumlein transmission line B1, the second end of the resistor R1 is connected to the surface line of the Blumlein transmission line B2; the first end of the capacitor C3 is connected to the Blumlein transmission line The axis of B2 is connected, the second end of the capacitor C3 is connected with the first end of the resistor R3; the second end of the capacitor C3 is connected with the coupling circuit; the second end of the resistor R3 is connected with the first end of the resistor R4, and the second end of the resistor R4 Both ends are grounded; the first end of the resistor R2 is connected to the surface wire of the Blumlein transmission line B2, the second end of the resistor R2 is connected to the second end of the resistor R4, and the second end of the resistor R4 is connected to the dust collector.

There are many kinds of pulse compression methods. At present, the magnetic switch is mostly used, but the magnetic switch is inconvenient to use, and the efficiency of the demagnetization circuit is low and the voltage loss is large. The utility model adopts the Blumlein transmission line and the gas switch. The Blumlein transmission line has high voltage and the gas switch The turn-on time is fast, but the insulation recovery time of the gas switch limits the repetition frequency of the power supply; therefore, the utility model improves the self-breakdown switch, and adds sulfur hexafluoride and an insulating grid to reduce the insulation recovery of the gas switch. Time, so that its repetition frequency meets the use of the circuit; in the pulse energy storage generating circuit 4, the IGBT is usually the first choice, although the IGBT has a high frequency and a large power, it is easy to burn due to poor overcurrent and overvoltage capabilities, and Compared with the thyristor, the price is expensive, and there is no need for fully controllable devices here. The soft switching technology can be realized by using the resonance of the inductance and capacitance. When the current is zero, the semi-controllable device thyristor can be turned off automatically, waiting for the next time discharge. The advantages of thyristors are large power, strong overcurrent and overvoltage capabilities, not easy to burn out, no need for complex protection circuits, and simple driving, no need for special driver chips, economical and practical, and reduced conduction voltage; The internal air pressure of the self-breakdown switch can be adjusted to make the output more stable; the utility model chooses the Blumlein transmission line to compress the pulse, and the Blumlein transmission line is often used for pulse compression, usually consisting of one or two transmission lines. The pulse voltage obtained by one transmission line is Half of the charging voltage, the pulse voltage obtained by the two transmission lines is equal to the charging voltage, which reduces the voltage loss.

The preferred specific embodiments of the present utility model have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the utility model without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the scope of protection defined by the claims .

Claims (10)

1. one kind is existed by thyristor controlled nanosecond class pulse generator for EDM, including fundamental wave circuit, corona wire and dust-precipitator, feature In, further includes:

The preposition boosting circuit of pulse, input terminal access three-phase alternating current, are pulse current by AC conversion；

Three-phase transformer, primary side are electrically connected with the preposition boosting circuit of pulse, voltage are boosted；

Impulse commutation filter circuit is electrically connected with three-phase transformer secondary side, is direct current by AC rectification；

Circuit occurs for pulse energy storage, is electrically connected with impulse commutation filter circuit, the width of DC pulse is transformed into Microsecond grade；

Pulse booster transformer, primary side occur circuit with pulse energy storage and are electrically connected, the voltage in pulse accumulator is carried out Boosting；

Narrowing circuit is electrically connected with the secondary side of pulse booster transformer, by the pulse current boil down to nanosecond of Microsecond grade The pulse current of grade；

Pulse sampling circuit, is electrically connected with narrowing circuit；

Trigger signal circuit is electrically connected with the preposition boosting circuit of pulse, and circuit occurs with pulse energy storage and is electrically connected, opens for controlling Close break-over of device；

Coupling circuit, for fundamental current and nanosecond pulse electric current to be overlapped boosting, the input terminal difference of coupling circuit It is electrically connected with fundamental wave circuit and pulse sampling circuit, the output end of coupling circuit is electrically connected with corona wire.

2. one kind according to claim 1 is by thyristor controlled nanosecond class pulse generator for EDM, which is characterized in that the arteries and veins Preposition boosting circuit is rushed, carries out pulse processing using three-phase electricity of three bidirectional thyristors to input.

3. one kind according to claim 1 is by thyristor controlled nanosecond class pulse generator for EDM, which is characterized in that the arteries and veins The rectifier bridge for rushing current rectifying and wave filtering circuit use has 3 groups of diodes being connected in series to constitute.

4. one kind according to claim 1 is by thyristor controlled nanosecond class pulse generator for EDM, which is characterized in that the arteries and veins It rushes energy storage and circuit occurs, use two-stage charging and discharging circuit, complete the work that pulse width is switched to Microsecond grade, while also again It is secondary to be boosted.

5. one kind according to claim 4 is by thyristor controlled nanosecond class pulse generator for EDM, which is characterized in that described fills Two thyristors that discharge loop uses have the function that cutoff thyristor by resonance as switching device.

6. one kind according to claim 1 is by thyristor controlled nanosecond class pulse generator for EDM, which is characterized in that the arteries and veins The compression device that compressor circuit uses is rushed as Self-breaking switch and Blumlein transmission line；The Blumlein transmission line is same Axis transmission line.

7. one kind according to claim 6 is by thyristor controlled nanosecond class pulse generator for EDM, which is characterized in that it is described from Breakdown switch includes:

Cylindricality metal shell, it is interior to be filled with high-pressure inert gas, ground connection；

Copper core, one end are electrically connected with the secondary side of pulse booster transformer, and the other end is inserted into cylindricality metal shell；

Insulate piston, is mounted in cylindricality metal shell, is slidably connected with cylindricality metal shell；

Clamping cap is equipped at the insulation piston centre, the clamping cap is fixedly connected with the other end of copper core；

Insulated enclosure circle, the entrance for being mounted on cylindricality metal shell go out, between copper core and cylindricality metal shell, for insulating And sealing function；

Insulate air bag, installs in cylindricality metal shell, is located at below insulation piston, and the interior bottom of one end and cylindricality metal shell is solid Fixed connection, the other end are fixedly connected with the bottom of insulation piston；

Several annular insulation screens, are mounted in cylindricality metal shell, are fixedly connected with cylindricality metal shell, be used for arc extinguishing；

Charge valve is mounted on insulation air bag across cylindricality metal shell, is fixedly connected with insulation air bag；

The copper core is as anode, and cylindricality metal shell is as cathode.

8. one kind according to claim 7 is by thyristor controlled nanosecond class pulse generator for EDM, which is characterized in that it is described from The filling gas of breakdown switch is sulfur hexafluoride.

9. one kind according to claim 1 is by thyristor controlled nanosecond class pulse generator for EDM, which is characterized in that the arteries and veins It rushes current rectifying and wave filtering circuit and the circuit of circuit occurs for pulse energy storage are as follows:

The U phase time winding of three-phase transformer secondary side is connect with the anode of diode D3, is connect with the cathode of diode D6；Three-phase The V phase time winding of Circuit Fault on Secondary Transformer is connect with the anode of diode D1, is connect with the cathode of diode D4；Three-phase transformer two The W phase time winding of secondary side is connect with the anode of diode D2, is connect with the cathode of diode D5；The cathode of diode D1 and two poles The cathode of pipe D2 is connected with the cathode of diode D3, is connect with the first end of capacitor C1；The anode and diode D5 of diode D4 Anode connected with the anode of diode D6, connect with the second segment of capacitor C1；The first end of capacitor C1 and the first of inductance L1 End connection, the second end of inductance L1 are connect with the anode of thyristor K1, and the cathode of thyristor K1 is connect with the first end of capacitor C2, The first end of capacitor C2 is connect with the first end of inductance L2, and the second segment of inductance L2 is connect with the anode of thyristor K2, thyristor The cathode of K2 is connect with the second end of capacitor C2, and the second segment of capacitor C2 is connect with the second segment of capacitor C1；Inductance L2 is pulse The primary side of step-up transformer.

10. one kind according to claim 1 is by thyristor controlled nanosecond class pulse generator for EDM, which is characterized in that described The circuit of narrowing circuit and pulse sampling circuit are as follows:

The anode of the first end of the secondary side of pulse booster transformer and Self-breaking switch connects, pulse booster transformer it is secondary The second segment of side and the cathode of Self-breaking switch connect, the minus earth of Self-breaking switch；

The axis of Blumlein transmission line B1 and the anode of Self-breaking switch connect, and the table line of Blumlein transmission line B1 is hit with oneself Wear the cathode connection of switch；The axis of Blumlein transmission line B2 is connect with the axis of Blumlein transmission line line B1, electricity The first end of resistance R1 is connect with the table line of Blumlein transmission line B1, the second end of resistance R1 and the table of Blumlein transmission line B2 Line connection；The first end of capacitor C3 is connect with the axis of Blumlein transmission line B2, and the of the second end of capacitor C3 and resistance R3 One end connection；The second end of capacitor C3 is connect with coupling circuit；The second end of resistance R3 is connect with the first end of resistance R4, resistance The second end of R4 is grounded；The first end of resistance R2 is connect with the table line of Blumlein transmission line B2, the second end and electricity of resistance R2 The second end connection of R4 is hindered, the second end of resistance R4 is connect with dust-precipitator.