CN209982455U

CN209982455U - Pulse thyristor trigger device

Info

Publication number: CN209982455U
Application number: CN201920725849.3U
Authority: CN
Inventors: 张敏; 徐杰
Original assignee: Wuhan Huazhong Huachang Energy Electric Technology Co Ltd
Current assignee: Wuhan Huazhong Huachang Energy Electric Technology Co Ltd
Priority date: 2019-05-20
Filing date: 2019-05-20
Publication date: 2020-01-21
Anticipated expiration: 2029-05-20

Abstract

The utility model discloses a pulse thyristor trigger device, which comprises a pulse generator, a plurality of driving circuit boards and a series thyristor group; the driving circuit board comprises a magnetic ring L1, two groups of coils and pulse current holding circuits, wherein the two groups of coils are wound on the magnetic ring L1, the winding directions of the two groups of coils are the same, the two groups of coils are respectively and electrically connected with the corresponding pulse current holding circuits, and the pulse current holding circuits of the driving circuit boards are respectively and electrically connected with the series thyristor groups; the pulse generator is electrically connected with a cable, and the cable sequentially penetrates through the magnetic rings L1. The utility model discloses have that the gate pole loss is little, the thyristor triggers stable technological effect.

Description

Pulse thyristor trigger device

Technical Field

The utility model relates to a technical field is triggered to the thyristor, concretely relates to pulse thyristor triggers device.

Background

The series thyristor is used as a pulse discharge switch in the application occasions of electromagnetic forming, electromagnetic emission, pulse strong magnetic field and the like in the industry. These applications require the series thyristor to withstand a relatively high current rise rate, which the thyristor can withstand when conducting, in relation to the gate trigger signal. The series thyristor switch applied to pulse discharge needs a special synchronous trigger circuit by integrating the series application characteristics of the thyristors and the high-current rise rate discharge working characteristics. At present, a series thyristor is used in a multi-purpose electromagnetic coupling triggering mode, a triggering signal adopts an alternating current or direct current signal, and after the thyristor is triggered and conducted, a gate pole loses a control effect, so that the loss is large.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned technique not enough, provide a pulse thyristor trigger device, solve the technical problem that the gate pole loss that prior art triggered is big.

In order to achieve the technical purpose, the technical scheme of the utility model provides a pulse thyristor trigger device, which comprises a pulse generator, a plurality of driving circuit boards and a series thyristor group;

the driving circuit board comprises a magnetic ring L1, two groups of coils and pulse current holding circuits, wherein the two groups of coils are wound on the magnetic ring L1, the winding directions of the two groups of coils are the same, the two groups of coils are respectively and electrically connected with the corresponding pulse current holding circuits, and the pulse current holding circuits of the driving circuit boards are respectively and electrically connected with the series thyristor groups; the pulse generator is electrically connected with a cable, and the cable sequentially penetrates through the magnetic rings L1.

Compared with the prior art, the beneficial effects of the utility model include: the utility model adopts the pulse generator to generate pulse trigger signals in the form of pulses to trigger the series thyristor group, thereby reducing gate pole loss; and simultaneously, the utility model discloses around establishing two sets of coils on magnetic ring L1, pulse trigger signal passes through the cable from the middle of magnetic ring L1, and magnetic ring L1 response pulse trigger signal produces pulse current on the coil, triggers switching on of series connection thyristor group through pulse current, in order to guarantee pulse trigger signal's width, the utility model discloses set up pulse current holding circuit for pulse current keeps to the series connection thyristor group switches on always, guarantees the reliable switching on of series connection thyristor group.

Drawings

Fig. 1 is a schematic diagram of a pulsed thyristor trigger device provided by the present invention;

fig. 2 is a schematic structural diagram of a series thyristor group of the pulsed thyristor triggering device provided by the present invention;

fig. 3 is a circuit diagram of a pulse current holding circuit of the pulsed thyristor trigger device provided by the present invention;

fig. 4 is a circuit diagram of a voltage equalizing plate of the pulse thyristor trigger device provided by the present invention;

fig. 5 is a schematic structural diagram of a voltage equalizing plate of the pulsed thyristor triggering device provided by the present invention;

fig. 6 is a circuit diagram of a voltage dependent resistor plate of the pulsed thyristor triggering device provided by the present invention;

fig. 7 is a circuit diagram of an RC absorbing plate of the pulsed thyristor trigger device provided by the present invention.

Reference numerals:

1. the pulse generator comprises a pulse generator 2, a driving circuit board 21, a first coil 22, a second coil 23, a pulse current holding circuit 3, a series thyristor group 31, a thyristor 32, an insulating rod 33, a second positioning hole 4, a protection circuit board 41, a pressure equalizing plate 411, a first positioning hole 42, a piezoresistor plate 43 and an RC absorption plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1:

as shown in fig. 1, embodiment 1 of the present invention provides a pulse thyristor trigger device, which includes a pulse generator 1, a plurality of driving circuit boards 2, and a series thyristor group 3;

the driving circuit board 2 comprises a magnetic ring L1, two groups of coils and a pulse current holding circuit 23, wherein the two groups of coils are wound on the magnetic ring L1, the winding directions of the two groups of coils are the same, the two groups of coils are respectively and electrically connected with the corresponding pulse current holding circuit 23, and the pulse current holding circuit 23 of each driving circuit board 2 is respectively and electrically connected with the series thyristor group 3; the pulse generator 1 is electrically connected with a cable 4, and the cable 4 sequentially penetrates through a plurality of magnetic rings L1.

The utility model provides a trigger device adopts impulse generator 1 to produce pulse signal to realize the triggering to series connection thyristor group 3 through pulse signal. Current series connection thyristor trigger signal adopts interchange or direct current signal usually, triggers to switch on the back, and the gate pole loses the control action, and the loss is great, the utility model provides a pulse trigger mode is fine has solved this problem. When the series thyristor group 3 is triggered by the pulse signal, the pulse signal has a certain width, and the leading edge of the pulse is steep, so that the series thyristor group 3 is ensured to be reliably conducted. If the trigger pulse is too narrow, the main loop current does not rise to the holding current of the series thyristor group 3 when the pulse signal is terminated, and the series thyristor group 3 is turned off again. Therefore, the utility model discloses set up dirver circuit board 2, dirver circuit board 2 receives pulse signal, dirver circuit board 2's main device is magnetic ring L1, magnetic ring L1 is made by magnetic material, have the gathering magnetic field, improve inductance efficiency's effect, magnetic ring L1 goes up rich has two sets of coils, the coil can be formed by the copper wire coiling, when pulse signal passes through the cable, magnetic ring L1 at first accepts pulse signal, the pulse current is inducted, pulse current flows out from two sets of coils, pulse current reaches series connection thyristor group 3 through pulse current holding circuit 23, at this moment series connection thyristor group 3 bears forward anode voltage, the gate pole bears the positive piece of forward voltage, series connection thyristor group 3 switches on. The pulse current holding circuit 23 fixes the pulse current at a specified current value, keeps the waveform of the pulse current unchanged, avoids the occurrence of the situation that the main loop current does not rise to the holding current of the series thyristor group 3 when the pulse signal is terminated, and ensures the normal conduction of the series thyristor group 3. Particularly, the cable is preferably a high-voltage cable, and has good safety performance.

The utility model provides a trigger device has that the gate pole loss is little, and the pulse triggers stably, and series connection thyristor group 3 switches on stable technological effect, safe and reliable, easy to maintain.

Preferably, as shown in fig. 1, the series thyristor group 3 includes a plurality of thyristors 31, the plurality of thyristors 31 are equal in number and correspond to the plurality of driving circuit boards 2 one by one, the pulse current holding circuit 23 of each driving circuit board 2 is electrically connected to the gates of the corresponding thyristors 31, the anodes and the cathodes of the plurality of thyristors 31 are electrically connected in sequence, and of the two thyristors 31 located at the end, the cathode and the anode that are not electrically connected to the other thyristors 31 are the cathode and the anode of the series thyristor group 3, respectively.

Each driving circuit board 2 corresponds to one thyristor 31, and controls the conduction and the closing of the corresponding thyristor 31. The anodes and cathodes of the plurality of thyristors 31 are electrically connected in sequence, and specifically, the anode of each thyristor 31 is electrically connected to the cathode of its adjacent thyristor 31.

Preferably, as shown in fig. 2, a plurality of thyristors 31 are stacked, each thyristor 31 is supported and connected to the thyristor 31 below by a plurality of insulating rods 32, each thyristor 31 is supported and connected to the thyristor 31 below by a conductive rod, and an anode of each thyristor 31 is electrically connected to a cathode of the thyristor 31 below by the conductive rod.

The stacked supporting connection of the plurality of thyristors 31 is realized by the insulating rods 32, and the conducting rods realize the sequential series connection among the plurality of thyristors 31 on the one hand, and further strengthen the stacked supporting connection of the plurality of thyristors 31 on the other hand, for the reason of viewing angle, not all conducting rods and all thyristors 31 are identified in fig. 2. Specifically, in the preferred embodiment, mounting holes are formed in both sides of each thyristor 31, both ends of the conducting rod 32 are respectively inserted into the mounting holes of two adjacent layers of thyristors 31, and the conducting rod 32 is preferably a tin-plated copper rod; threaded holes are formed in the two sides of each thyristor 31, the two ends of each insulating rod are in threaded connection with the threaded holes of the two adjacent layers of thyristors 31 respectively, and the insulating rod 32 preferably selects an insulating epoxy screw. The insulating rod 32 is preferably made of FR-4 material, and the FR-4 material is a plate-shaped laminated product formed by soaking special electronic cloth with materials such as epoxy phenolic resin and the like through high-temperature high-pressure hot pressing, and has high mechanical property and dielectric property, good heat resistance and moisture resistance and good machinability.

The series connection between a lot of existing series thyristor group 3 is through screw fixed mounting, and the design is too complicated and the reliability is not high, the utility model provides a simple also be convenient for installation of series thyristor group 3 structural design can the steady operation in harsh environment.

Preferably, as shown in fig. 3, the pulse current holding circuit 23 includes a diode D5, a diode D9, a diode D10, a resistor R1, a resistor R7, a resistor R6, and a resistor R17;

the two groups of coils are respectively a first coil 21 and a second coil 22; the positive terminal M1+ of the first coil 21 is electrically connected to the anode of the diode D9, the cathode of the diode D9 is electrically connected to the gate of the corresponding thyristor through the resistor R1, the resistors R7 and R6 are respectively connected in parallel to the resistor R1, the negative terminal M1-of the first coil 21 is electrically connected to the cathode of the thyristor 31, the negative terminal M1-of the first coil 21 is also electrically connected to the anode of the diode D10, the cathode of the diode D10 is electrically connected to the gate of the corresponding thyristor, and the resistor R17 is connected in parallel to the diode D10; the positive terminal M2+ of the second coil 22 is electrically connected to the anode of the diode D5, the cathode of the diode D5 is electrically connected to the cathode of the diode D9, the negative terminal M2-of the second coil 22 is electrically connected to the cathode of the corresponding thyristor, and the negative terminal M2-of the second coil 22 is also electrically connected to the negative terminal M1-of the first coil 21.

The working process of the pulse current holding circuit 23 is as follows: after the two groups of coils induce pulse current, the pulse current respectively passes through the diode D9 and the diode D5 to reach a parallel circuit consisting of the resistor R1, the resistor R2 and the resistor R6, and finally flows to the gate pole of the corresponding thyristor. The diode D9 and the diode D5 are used for preventing the pulse generator 1 from being damaged by pulse current backflow, the resistor R17 and the diode D10 form a clamp circuit, and then the clamp circuit is connected between a gate pole and a cathode of a corresponding thyristor in parallel, the pulse current is fixed on a specified current value, and the original waveform shape is kept unchanged. Specifically, the diode D9 and the diode D5 are patch diodes of US5M type, and have safe and reliable performance and long service life; the resistor R17 has a resistance of 1K, and the diode D10 has a model number of US 5M. The utility model provides a "first", "second" do not show the logical order relation, only in order to distinguish two sets of coils, and do not be used for the restriction the utility model discloses.

Preferably, as shown in fig. 1, the triggering device further includes a protection circuit board 4 for preventing the series thyristor group 3 from being overloaded by an overcurrent, the protection circuit board 4 includes a voltage equalizing board 41, a varistor board 42 and an RC absorbing board 43, and the voltage equalizing board 41, the varistor board 42 and the RC absorbing board 43 are electrically connected to the series thyristor group 3 respectively.

Because thyristor itself anti overflows, anti overload capacity is poor, and a surge current just probably causes scrapping of thyristor, consequently, the utility model discloses set up protection circuit board 4, prevent that the condition of damage thyristor such as overflowing, transshipping from appearing in the thyristor, ensure the safe and reliable operation of thyristor. The protection circuit board 4 provided by the utility model has simple design and easy maintenance; protection paths are diversified, voltage-sharing and pressure-sensitive, and multiple protection is absorbed by the RC, so that the triggering process is safer and more reliable.

Preferably, as shown in fig. 4, the voltage equalizing plate 41 includes a plurality of patch resistor sets, each patch resistor set includes a plurality of patch resistors RT connected in parallel, and the plurality of patch resistor sets are sequentially connected in series between the anode and the cathode of the series thyristor set 3.

The main function of the voltage equalizing plate 41 is that the thyristor is prone to have a problem of uneven voltage division when used in series, and the voltage equalizing plate 41 can be used for solving the problem. In the preferred embodiment, there are sixteen groups of chip resistor groups, each group of chip resistor group includes six chip resistors RT, the six chip resistors RT of each group of chip resistor group are respectively connected in parallel, and the multiple groups of chip resistor groups are sequentially connected in series after being connected in parallel. Not all of the patch resistances RT are identified in fig. 4.

Preferably, as shown in fig. 5, in each group of the chip resistor groups, a part of the chip resistors RT are distributed on one side of the PCB, and another part of the chip resistors RT are distributed on the other side of the PCB.

In order to save the occupied space and facilitate maintenance, the chip resistors RT are distributed on two sides of the PCB. Specifically, in the preferred embodiment, three of the six chip resistors RT in each group of chip resistor groups are distributed on one side of the PCB, and the other three chip resistors RT are distributed on the other side of the PCB. Again, not all of the patch resistors RT are identified in fig. 5.

Preferably, as shown in fig. 5 and fig. 2, a plurality of first positioning holes 411 are formed in the pressure equalizing plate 41, a plurality of second positioning holes 33 corresponding to the first positioning holes 411 one by one are respectively formed in the anode and the cathode of the serial thyristor group 3, and the first positioning holes 411 are in threaded connection with the corresponding second positioning holes 33 through positioning screws.

The pressure equalizing plate 41 is connected to the anode and the cathode of the pulse thyristor, and adopts a mode of connecting a positioning hole and a positioning screw rod for safe and reliable connection. The positioning screw is not shown in fig. 5. Not all of the second positioning holes 33 are identified in fig. 2.

Preferably, as shown in fig. 6, the varistor plate 42 includes a plurality of varistor groups, each varistor group includes a plurality of parallel varistors RM, and the varistor groups are sequentially connected in series between the anode and the cathode of the series thyristor group 3.

The varistor RM is a semiconductor resistor device having a nonlinear voltage-current characteristic. In the preferred embodiment, the two groups of voltage dependent resistor groups 42 are respectively connected in parallel, and then the two groups of voltage dependent resistor groups are connected in series, so that the voltage dependent resistor 42 is simple and easy to maintain, and the voltage dependent resistor groups can protect the pulse thyristor from damage by protecting the voltage dependent resistor RM from being damaged by protecting the voltage dependent resistor RM when the anode and the cathode of the thyristor group 3 connected in series suddenly suffer overvoltage. Not all piezoresistors RM are identified in fig. 6.

Preferably, a plurality of third positioning holes corresponding to the second positioning holes 33 one to one are formed in the varistor plate 42, and the third positioning holes are in threaded connection with the corresponding second positioning holes 33 through positioning screws.

Like the voltage equalizing plate 41, the voltage dependent resistor plate 42 is connected between the anode and the cathode of the series thyristor group 3, and for safe and reliable connection, a positioning hole and a positioning screw are used for connection.

Preferably, as shown in fig. 7, the RC absorbing plate 43 includes a capacitor C1, a capacitor C2, a capacitor C3, a diode D1, a diode D2, a diode D3, a diode D4, a resistor R2, a resistor R3, a resistor R4, and a resistor R5;

the anode of the series thyristor group 3 is electrically connected to the anode of the diode D1 through the capacitor C1, the cathode of the diode D1 is electrically connected to the anode of the diode D2, the cathode of the diode D2 is electrically connected to the anode of the diode D3, the cathode of the diode D3 is electrically connected to the anode of the diode D4, the cathode of the diode D4 is electrically connected to the cathode of the series thyristor group 3, the capacitors C2 and C3 are electrically connected to the capacitor C1, respectively, the resistor R2 is connected in parallel to the diode D1, the resistor R3 is connected in parallel to the diode D2, the resistor R4 is connected in parallel to the diode D3, and the resistor R5 is connected in parallel to the diode D4.

The RC absorption loop plays a role in absorbing instantaneous overvoltage of the thyristor, limiting the current rise rate and dynamically equalizing voltage. The four resistors are used for forming damping oscillation, oscillation overvoltage cannot be generated, the rising rate of the switching-on current of the thyristor is reduced, and switching-on loss is reduced. Each resistor and the corresponding diode are connected in parallel to form a clamping and guarding circuit, and the clamping and guarding circuit is connected in series after being connected in parallel to play a role in protection. Specifically, in the preferred embodiment, the capacitor C1, the capacitor C2, and the capacitor C3 are all non-inductive capacitors, and have the specification of 5000V and 00150F ± 10%, and the resistor R2, the resistor R3, the resistor R4, and the resistor R5 have the specification of 10W and 51 Ω.

The utility model provides a 4 repetitious use of protection circuit board pincers defend the circuit, fix impulse current on appointed current value, make thyristor can steady operation.

Preferably, a plurality of fourth positioning holes corresponding to the second positioning holes 33 one to one are formed in the RC absorbing plate 43, and the fourth positioning holes are in threaded connection with the corresponding second positioning holes 33 through positioning screws.

Like the voltage equalizing plate 41, the RC absorbing plate 43 is connected between the anode and the cathode of the series thyristor group 3, and for safe and reliable connection, a positioning hole and a positioning screw are used for connection.

The above description of the present invention does not limit the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A pulse thyristor trigger device is characterized by comprising a pulse generator, a plurality of driving circuit boards and a series thyristor group;

the driving circuit board comprises a magnetic ring L1, two groups of coils and a pulse current holding circuit, wherein the two groups of coils are wound on the magnetic ring L1, the winding directions of the two groups of coils are the same, the two groups of coils are respectively and electrically connected with the corresponding pulse current holding circuits, and the pulse current holding circuits of the driving circuit boards are respectively and electrically connected with the series thyristor group; the pulse generator is electrically connected with a cable, and the cable sequentially penetrates through the magnetic rings L1.

2. The pulsed thyristor trigger device according to claim 1, wherein the series thyristor group comprises a plurality of thyristors which are equal in number and in one-to-one correspondence with the plurality of driving circuit boards, the pulse current holding circuit of each driving circuit board is electrically connected to the gate of the corresponding thyristor, the anodes and the cathodes of the plurality of thyristors are electrically connected in sequence, and of the two thyristors at the end, the cathode and the anode which are not electrically connected to the other thyristors are the cathode and the anode of the series thyristor group, respectively.

3. The pulsed thyristor trigger device of claim 2, wherein a plurality of thyristors are stacked, each thyristor is supported and connected to the thyristor below by a plurality of insulating rods, each thyristor is supported and connected to the thyristor below by a conducting rod, and the anode of each thyristor is electrically connected to the cathode of the thyristor below by the conducting rod.

4. The pulsed thyristor trigger device of claim 2, wherein the pulsed current hold circuit comprises a diode D5, a diode D9, a diode D10, a resistor R1, a resistor R7, a resistor R6, and a resistor R17;

the two groups of coils are respectively a first coil and a second coil; the positive terminal M1+ of the first coil is electrically connected with the anode of the diode D9, the cathode of the diode D9 is electrically connected with the gate of the corresponding thyristor through the resistor R1, the resistor R7 and the resistor R6 are respectively connected with the resistor R1 in parallel, the negative terminal M1-of the first coil is electrically connected with the cathode of the thyristor, the negative terminal M1-of the first coil is also electrically connected with the anode of the diode D10, the cathode of the diode D10 is electrically connected with the gate of the corresponding thyristor, and the resistor R17 is connected with the diode D10 in parallel; the positive terminal M2+ of the second coil is electrically connected with the anode of the diode D5, the cathode of the diode D5 is electrically connected with the cathode of the diode D9, the negative terminal M2-of the second coil is electrically connected with the cathode of the corresponding thyristor, and the negative terminal M2-of the second coil is also electrically connected with the negative terminal M1-of the first coil.

5. The pulsed thyristor trigger device according to claim 2, further comprising a protection circuit board for preventing the series thyristor group from overcurrent overload, wherein the protection circuit board comprises a voltage-equalizing plate, a voltage-dependent resistor plate and an RC absorption plate, and the voltage-equalizing plate, the voltage-dependent resistor plate and the RC absorption plate are respectively electrically connected with the series thyristor group.

6. The pulsed thyristor trigger device according to claim 5, wherein the voltage equalizing plate comprises a plurality of groups of chip resistor sets, each group of chip resistor sets comprises a plurality of chip resistors RT connected in parallel, and the plurality of groups of chip resistor sets are sequentially connected in series between the anode and the cathode of the series thyristor set.

7. The device as claimed in claim 6, wherein in each of the patch resistor groups, a part of the patch resistors RT are distributed on one side of the PCB, and another part of the patch resistors RT are distributed on the other side of the PCB.

8. The pulsed thyristor trigger device according to claim 6, wherein the voltage-equalizing plate is provided with a plurality of first positioning holes, the anode and the cathode of the series thyristor group are respectively provided with a plurality of second positioning holes corresponding to the first positioning holes one by one, and the first positioning holes are in threaded connection with the corresponding second positioning holes through positioning screws.

9. The pulsed thyristor trigger device of claim 5, wherein the varistor plate comprises a plurality of varistor groups, each varistor group comprising a plurality of parallel-connected varistors RM, the plurality of varistor groups being connected in series between an anode and a cathode of the series thyristor group.

10. The pulsed thyristor trigger device of claim 5, wherein the RC absorption plate comprises a capacitor C1, a capacitor C2, a capacitor C3, a diode D1, a diode D2, a diode D3, a diode D4, a resistor R2, a resistor R3, a resistor R4, and a resistor R5;

the anode of the series thyristor group is electrically connected with the anode of the diode D1 through the capacitor C1, the cathode of the diode D1 is electrically connected with the anode of the diode D2, the cathode of the diode D2 is electrically connected with the anode of the diode D3, the cathode of the diode D3 is electrically connected with the anode of the diode D4, the cathode of the diode D4 is electrically connected with the cathode of the series thyristor group, the capacitors C2 and C3 are respectively electrically connected with the capacitor C1, the resistor R2 is connected in parallel with the diode D1, the resistor R3 is connected in parallel with the diode D2, the resistor R4 is connected in parallel with the diode D3, and the resistor R5 is connected in parallel with the diode D4.