A pulse thyristor parallel triggering circuit and pulse discharge system

Abstract

This invention discloses a parallel triggering circuit for pulsed thyristors and a pulsed discharge system, belonging to the field of thyristor triggering technology. It includes: N trigger power supplies, N trigger modules, and corresponding N sets of series-connected thyristor groups, where N > 1. Each trigger module includes a capacitor, a current-limiting resistor, a trigger switch, and a trigger transformer. The capacitor and trigger switch are connected in series and then in parallel to the primary side of the trigger transformer. Each set of series-connected thyristors is connected to the secondary side of the corresponding trigger transformer. The current-limiting resistor is connected between the positive terminal of the corresponding trigger power supply and one end of the capacitor. Each trigger power supply is used to charge the capacitor in the corresponding trigger module. Each trigger module is connected in parallel to the primary side of the trigger transformer through the two ends of the trigger switch. The trigger circuit of this invention has a simple structure, can simultaneously trigger each set of thyristors, has high reliability and safety, and is applicable to all scenarios requiring synchronous triggering.

Description

Technical Field

[0001] This invention belongs to the field of thyristor triggering technology, and more specifically, relates to a pulse thyristor parallel triggering circuit and a pulse discharge system. Background Technology

[0002] Due to their high reliability, strong controllability, and high voltage withstand capability, thyristors are often used in high-voltage, high-current applications such as electromagnetic forming, electromagnetic emission, and pulsed strong magnetic fields. In these applications, series-connected thyristor groups are generally used as pulse discharge switches.

[0003] During operation, the energy storage device connected to the series thyristor group generates ultra-high pulse current. Therefore, multiple series thyristor groups need to operate simultaneously for discharge. Currently, each series thyristor group is mostly triggered independently. When one of the trigger power supplies fails or the trigger switch fails to respond to the trigger signal, that series thyristor group fails to trigger. This causes the remaining series thyristor groups to bear greater current stress when releasing energy, which may lead to the series thyristor group being broken down due to overcurrent, resulting in serious consequences. Summary of the Invention

[0004] To address the shortcomings and improvement needs of existing technologies, this invention provides a pulse thyristor parallel triggering circuit and pulse discharge system, which aims to solve the thyristor overcurrent problem caused by control switch trigger failure or power circuit failure.

[0005] To achieve the above objectives, according to a first aspect of the present invention, a pulse thyristor parallel triggering circuit is provided, comprising: N trigger power supplies, N trigger modules and corresponding N sets of series thyristor groups, wherein N > 1;

[0006] Each trigger module includes a capacitor, a current-limiting resistor, a trigger switch, and a trigger transformer; the capacitor and the trigger switch are connected in series and then in parallel to the primary side of the trigger transformer; each group of series thyristors is connected to the secondary side of the corresponding trigger transformer; the current-limiting resistor is connected between the positive terminal of the corresponding trigger power supply and one end of the capacitor; wherein, each trigger power supply is used to charge the capacitor in the corresponding trigger module;

[0007] Each of the trigger modules is connected in parallel to the primary side of the trigger transformer through the two ends of the trigger switch.

[0008] Furthermore, the current-limiting resistor is connected to the first terminal of the capacitor;

[0009] The second terminal of the capacitor is connected in series with the first terminal of the trigger switch, and then connected in parallel with the first terminal of the capacitor through the second terminal of the trigger switch to the primary side of the trigger transformer.

[0010] The first terminal of the trigger switch is connected to the negative terminal of the trigger power supply.

[0011] Furthermore, the current-limiting resistor is connected to the first terminal of the capacitor;

[0012] The first terminal of the capacitor is connected in series with the first terminal of the trigger switch, and then connected in parallel with the second terminal of the capacitor through the second terminal of the trigger switch to the primary side of the trigger transformer.

[0013] The second terminal of the trigger switch is connected to the negative terminal of the trigger power supply.

[0014] Furthermore, each thyristor in each of the series thyristor groups is connected to a secondary side of the trigger transformer.

[0015] Furthermore, the trigger switch is a MOSFET, IGBT, thyristor, transistor, or relay.

[0016] Furthermore, the value of the capacitor is greater than a set threshold.

[0017] Furthermore, it also includes a magnetic reset module, wherein the magnetic reset circuit is connected in parallel to the primary side of the trigger transformer.

[0018] Furthermore, the magnetic reset module includes a bleed resistor and an anti-parallel diode.

[0019] According to a second aspect of the present invention, a pulse discharge system is provided, comprising a pulse thyristor parallel trigger circuit as described in any one of the first aspects, N sets of energy storage devices and a load; each set of energy storage devices is connected in series with a corresponding set of series thyristors and then connected in parallel across the load.

[0020] In summary, the above-described technical solutions conceived in this invention can achieve the following beneficial effects:

[0021] (1) When the pulse thyristor parallel triggering circuit in the embodiment of the present invention triggers each group of series thyristors, each triggering module is connected in parallel through the two ends of its respective triggering switch. When the triggering switch fails to respond to the triggering signal, or when the triggering switch has an open circuit fault, or when the triggering power supply has an open circuit fault, the triggering modules can serve as backups for each other and synchronously trigger all the series thyristor groups.

[0022] Specifically, when a trigger module malfunctions (the trigger switch fails to respond to the trigger signal or the trigger switch experiences an open circuit fault), the malfunctioning trigger module can form a commutation circuit with the trigger switch through the wires of other trigger modules connected in parallel with it. This allows the capacitor in the malfunctioning trigger module to discharge, and then the capacitor in the malfunctioning trigger module can be used to trigger the corresponding series thyristor group, thereby ensuring that each group of thyristors is triggered synchronously.

[0023] When a circuit failure occurs in the trigger power supply, the trigger power supply that is not faulty forms a commutation circuit through the wires of the trigger module corresponding to the faulty trigger power supply connected in parallel with it. This circuit charges the capacitor in the trigger module corresponding to the faulty trigger power supply, and then uses the trigger module corresponding to the faulty trigger power supply to trigger the corresponding series thyristor group, so as to ensure that each group of thyristors is triggered synchronously.

[0024] When a short-circuit fault occurs in the trigger switch, the trigger power supply of other trigger modules that have not failed bypasses their respective capacitors by forming a loop through the wires connected in parallel with it. The capacitors of each trigger module cannot be charged, and all trigger modules cannot be triggered, thus avoiding the risk of excessive current stress on some thyristors due to partial triggering.

[0025] (2) Preferably, when the trigger module adopts the first topology, when the trigger switch is turned off, the spike voltage can be absorbed by the capacitor in the trigger module without the need for an additional buffer circuit, and when the trigger time is long, no demagnetizing circuit is needed.

[0026] (3) Preferably, when the trigger module adopts the second topology, the trigger power supply corresponding to each trigger module charges the capacitor to store energy, while the charging current flows through the primary side of the trigger transformer to force the magnetic core to reset, further saving the additional magnetic reset circuit.

[0027] (4) Preferably, a MOSFET is selected as the trigger switch to ensure a fast response to the trigger signal.

[0028] (5) Preferably, the value of the capacitor in the trigger module is greater than the set threshold to ensure that it can provide sufficient energy after receiving the trigger signal provided by the external controller.

[0029] In summary, the pulse thyristor parallel triggering circuit provided by this invention can ensure synchronous triggering of all series-connected thyristor groups when the trigger power supply fails to open, the trigger switch fails to respond to the trigger signal, or the trigger switch fails to open; when the trigger switch is short-circuited, it can ensure that all series-connected thyristor groups do not trigger; it effectively prevents thyristor overcurrent breakdown caused by single-path triggering, improves the safety and stability of the circuit, and ensures the reliability of the circuit operation. Attached Figure Description

[0030] Figure 1 This is the pulse thyristor parallel triggering circuit provided in Embodiment 1 of the present invention.

[0031] Figure 2 This is the pulse thyristor parallel triggering circuit provided in Embodiment 2 of the present invention.

[0032] Figure 3 The pulse discharge circuit provided by this invention.

[0033] Figure 4 This describes the commutation status of the pulse thyristor parallel trigger circuit provided in Embodiment 1 of the present invention during normal operation (trigger switch off).

[0034] Figure 5 This describes the commutation status of the pulse thyristor parallel trigger circuit provided in Embodiment 1 of the present invention during normal operation (trigger switch closed). Figure 6 This describes the commutation situation of the pulse thyristor parallel trigger circuit provided in Embodiment 1 of the present invention when the trigger switch fails to respond to the trigger signal or when the trigger switch experiences an open circuit fault.

[0035] Figure 7 This describes the commutation situation of the pulse thyristor parallel trigger circuit provided in Embodiment 1 of the present invention when the trigger power supply experiences an open circuit fault.

[0036] Figure 8 This describes the commutation situation of the pulse thyristor parallel trigger circuit provided in Embodiment 1 of the present invention under a switch short-circuit fault.

[0037] Figure 9 This describes the commutation status of the pulse thyristor parallel trigger circuit provided in Embodiment 2 of the present invention during normal operation (trigger switch open).

[0038] Figure 10 This describes the commutation status of the pulse thyristor parallel trigger circuit provided in Embodiment 2 of the present invention during normal operation (trigger switch closed).

[0039] Figure 11 This describes the commutation situation of the pulse thyristor parallel trigger circuit provided in Embodiment 2 of the present invention when the trigger switch fails to respond to the trigger signal or when the trigger switch experiences an open circuit fault.

[0040] Figure 12 This describes the commutation situation of the pulse thyristor parallel trigger circuit provided in Embodiment 2 of the present invention when the trigger power supply experiences an open circuit fault.

[0041] Figure 13 This describes the commutation situation of the pulse thyristor parallel trigger circuit provided in Embodiment 2 of the present invention under a switch short-circuit fault. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be 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 and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0043] like Figure 1 , Figure 2 As shown, the pulse thyristor parallel trigger circuit of the present invention mainly includes: N trigger power supplies, N trigger modules and corresponding N sets of series thyristor groups, wherein N>1;

[0044] Each trigger module includes a capacitor, a current-limiting resistor, a trigger switch, and a trigger transformer; the capacitor and trigger switch are connected in series and then in parallel to the primary side of the trigger transformer; each set of series thyristors is connected to the secondary side of the corresponding trigger transformer; the current-limiting resistor is connected between the positive terminal of the corresponding trigger power supply and one end of the capacitor; wherein, each trigger power supply is used to charge the capacitor in the corresponding trigger module.

[0045] Each trigger module is connected in parallel to the primary side of the trigger transformer via the two ends of a trigger switch.

[0046] Specifically, each thyristor in each series thyristor group is connected to a secondary side of the trigger transformer.

[0047] The trigger power supply is used to charge the capacitor in the corresponding subsequent trigger module.

[0048] Each trigger module is used to control the on / off state of the corresponding series thyristor group in order to trigger the series thyristor group.

[0049] Specifically, the current-limiting resistor and capacitor in each trigger module are used to provide the pulse trigger current; the value of the capacitor is greater than the set threshold to ensure that sufficient energy can be provided after receiving the trigger signal from the external controller. The set threshold is determined based on experience.

[0050] The trigger switch is used for pulse triggering. When a trigger signal is received, the trigger switch closes, the capacitor releases a pulse current, which is induced to the secondary side of the trigger transformer, causing the trigger module to trigger the corresponding series thyristor group. The trigger switch includes, but is not limited to, MOSFETs and their driving circuits, or switching devices such as IGBTs, thyristors, transistors, and relays. In this embodiment of the invention, a MOSFET is selected as the trigger switch to ensure a fast response to the trigger signal.

[0051] The trigger transformer is used for electrical isolation between the primary trigger circuit and the secondary main circuit to ensure the safety of the equipment.

[0052] Series thyristor arrays are used as high-voltage, high-current discharge switches for precision control equipment.

[0053] like Figure 3 As shown, based on the above-described pulse thyristor parallel triggering circuit, this invention also provides a pulse discharge system, including the pulse thyristor parallel triggering circuit of the above embodiment, N sets of energy storage devices, and a load; each set of energy storage devices is connected in series with a corresponding set of series thyristors and then connected in parallel across the load. The parallel triggering module triggers the corresponding sets of series thyristors respectively. During operation, each set of energy storage devices is pre-charged to store energy. When a control signal is received from the host computer, the pulse thyristor parallel triggering circuit triggers each set of series thyristors, turning on the thyristor sets and releasing energy from each set of energy storage devices to the load, generating a pulse signal.

[0054] When the pulse thyristor parallel triggering circuit designed according to the present invention triggers each group of series thyristors, each triggering module is connected in parallel through the two ends of its respective trigger switch. When the trigger switch fails to respond to the trigger signal, or when the trigger switch or the trigger power supply fails to respond to the trigger signal, the triggering modules can serve as backups for each other and synchronously trigger all groups of series thyristors.

[0055] Specifically, when a trigger module malfunctions (the trigger switch fails to respond to the trigger signal or the trigger switch experiences an open circuit fault), the malfunctioning trigger module can form a circuit with the trigger switch through the wires of other trigger modules connected in parallel with it. This allows the capacitor in the malfunctioning trigger module to discharge, and then the capacitor in the malfunctioning trigger module can be used to trigger the corresponding series thyristor group, thereby ensuring that each group of thyristors is triggered synchronously.

[0056] When a circuit failure occurs in the trigger power supply, the trigger power supply that is not faulty forms a circuit through the wires of the trigger module corresponding to the faulty trigger power supply connected in parallel with it. This circuit charges the capacitor in the trigger module corresponding to the faulty trigger power supply, and then the trigger module corresponding to the faulty trigger power supply triggers the corresponding series thyristor group to ensure that each group of thyristors is triggered synchronously.

[0057] When a short-circuit fault occurs in the trigger switch, the trigger power supply of other trigger modules that have not failed bypasses their respective capacitors by forming a loop through the wires connected in parallel with it. The capacitors of each trigger module cannot be charged, and all trigger modules cannot be triggered, thus avoiding the risk of excessive current stress on some thyristors due to partial triggering.

[0058] See Figures 4 to 13As shown, taking N=2 and using two sets of parallel trigger modules as an example, the commutation situation of the pulse thyristor parallel trigger circuit under normal operation, when the trigger switch fails to respond to the trigger signal or when the trigger switch has an open circuit fault, when the trigger power supply has an open circuit fault, and when the trigger switch has a short circuit fault, is explained through different embodiments.

[0059] Example 1

[0060] In this embodiment of the invention, the triggering module adopts a first topology structure, as detailed below. Figure 1 The current-limiting resistor is connected to the first terminal of the capacitor; the second terminal of the capacitor is connected in series with the first terminal of the trigger switch, and then connected in parallel with the first terminal of the capacitor through the second terminal of the trigger switch to the primary side of the trigger transformer; the first terminal of the trigger switch is connected to the negative terminal of the trigger power supply.

[0061] Furthermore, it also includes a magnetic reset circuit. The magnetic reset circuit includes a bleed resistor and an anti-parallel diode, and the magnetic reset circuit is connected in parallel to the primary side of the trigger transformer.

[0062] When the parallel trigger circuit is working normally, the wires W1 and W2 connected in parallel between the two trigger modules are not conductive, and each trigger module independently triggers the corresponding thyristor group through its corresponding capacitor and trigger transformer.

[0063] Specifically, such as Figure 4 and Figure 5 As shown, when the trigger switch of each trigger module is open, the trigger power supply of each trigger module charges the capacitor to store energy; when the trigger switch is closed, each trigger module releases energy through the corresponding capacitor and trigger switch to trigger its respective series thyristor group.

[0064] like Figure 6 As shown, when the parallel trigger circuit fails to respond to the trigger signal or the trigger switch experiences an open circuit fault, the capacitor in the trigger module corresponding to the open circuit fault can charge normally, but cannot discharge normally. In this embodiment of the invention, taking the failure of trigger switch S2 to work normally as an example, at this time, trigger module 1 can still trigger the series thyristor group #1 normally. Although trigger switch S2 cannot work normally, capacitor C2 in trigger module 2 can release energy through the primary side of trigger transformer T2, W2, trigger switches S1 and W1 to form a circuit to trigger thyristor group 2#, ensuring that each group of thyristors is triggered synchronously.

[0065] like Figure 7 As shown, when the parallel trigger circuit experiences an open-circuit fault in the trigger power supply, the capacitor in the trigger module corresponding to the faulty trigger power supply cannot be charged. In this embodiment of the invention, the trigger power supply V... CC2Taking the example of a malfunction, trigger module 1 can still normally trigger the series thyristor group #1, even though the trigger power supply V... CC2 The capacitor C2 in trigger module 2 cannot be charged normally, but trigger module 2 can be powered by the trigger power supply V through the parallel wires W1 and W2 between the two trigger modules. CC1 The capacitor C2 in the trigger module 2 is charged through W1 and W2. When the trigger switch S2 in the trigger module 2 is closed, the thyristor group #2 is triggered to ensure that each group of thyristors is triggered synchronously.

[0066] like Figure 8 As shown, when a short-circuit fault occurs in the trigger switch of the parallel trigger circuit, in this embodiment of the invention, taking the short-circuit fault of trigger switch S1 as an example, for trigger module 1, V CC1 Through R1, the primary side of the trigger transformer T1 forms a circuit with S1, bypassing capacitor C1; for trigger module 2, V CC2 Through R2, the primary side of the trigger transformer T1 is triggered. W2, S1 and W1 form a circuit, bypassing capacitor C2. The capacitors of each trigger module cannot store energy. Even if the trigger switch responds to the trigger signal and acts, it cannot be triggered, thus avoiding the risk of excessive current stress on some thyristors due to partial triggering.

[0067] Example 2

[0068] In this embodiment of the invention, the triggering module adopts a second topology, as detailed below. Figure 2 The current-limiting resistor is connected to the first terminal of the capacitor; the first terminal of the capacitor is connected in series with the first terminal of the trigger switch, and then connected in parallel with the second terminal of the capacitor through the second terminal of the trigger switch to the primary side of the trigger transformer; the second terminal of the trigger switch is connected to the negative terminal of the trigger power supply.

[0069] When the parallel trigger circuit is working normally, the wires W1 and W2 connected in parallel between the two trigger modules are not conductive, and each trigger module independently triggers the corresponding thyristor group through its corresponding capacitor and trigger transformer.

[0070] Specifically, such as Figure 9 and Figure 10 As shown, when the trigger switches of each trigger module are open, the trigger power supply corresponding to each trigger module charges the capacitor to store energy. At the same time, the charging current flows through the primary side of the trigger transformer, forcing the magnetic core to reset, further saving the need for an additional magnetic reset circuit. When the trigger switches are closed, each trigger module releases energy through its corresponding capacitor and trigger switch to trigger its respective series thyristor group.

[0071] When the parallel trigger circuit fails to respond to the trigger signal or the trigger switch experiences an open circuit fault, such as Figure 11As shown in the embodiment of the present invention, taking the failure of trigger switch S2 to work normally as an example, at this time, trigger module 1 can still trigger the series thyristor group #1 normally. Although trigger switch S2 cannot work normally, through the parallel wires W1 and W2 between the two trigger modules, capacitor C2 can release energy through W1, S1 and W2 to form a circuit to trigger thyristor group 2#, ensuring that each group of thyristors is triggered synchronously.

[0072] When the parallel trigger circuit experiences an open circuit fault in the trigger power supply, such as Figure 12 As shown, in this embodiment of the invention, a trigger power supply V is used. CC2 For example, if it cannot work properly, although the trigger power supply V CC2 The capacitor C2 in trigger module 2 cannot be charged normally, but trigger module 2 can be powered by the trigger power supply V through the parallel wires W1 and W2 between the two trigger modules. CC1 Capacitor C2 is charged through W1 and W2. When trigger switch S2 in trigger module 2 is closed, thyristor group 2# is further triggered.

[0073] When a short-circuit fault occurs in the trigger switch of the parallel trigger circuit, such as Figure 13 As shown, in this embodiment of the invention, taking a short-circuit fault in trigger switch S1 as an example, for trigger module 1, V CC1 Through R1, trigger switch S1 forms a circuit, bypassing capacitor C1; for trigger module 2, V CC2 By bypassing capacitor C2 through R2, W1, and W2, each trigger module is unable to charge the corresponding capacitor and trigger each group of thyristors, thus avoiding the risk of excessive current stress on some thyristors due to partial triggering.

[0074] The pulse thyristor parallel triggering circuit provided by this invention achieves the function of mutual backup of trigger modules only through wire connection. This avoids the thyristor overcurrent problem caused by the failure of one set of trigger power supplies or the failure of the trigger switch to respond to the trigger signal, resulting in the failure of the series-connected thyristors to trigger. Furthermore, the pulse thyristor parallel triggering circuit of this invention has a simple structure, does not increase additional costs, has a wide range of applications, and can be used in all scenarios requiring synchronous triggering.

[0075] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pulse thyristor parallel triggering circuit, characterized in that, include: N trigger power supplies, N trigger modules and corresponding N sets of series thyristor groups, where N > 1; Each trigger module includes a capacitor, a current-limiting resistor, a trigger switch, and a trigger transformer; the capacitor and the trigger switch are connected in series and then in parallel to the primary side of the trigger transformer; each group of series thyristors is connected to the secondary side of the corresponding trigger transformer; the current-limiting resistor is connected between the positive terminal of the corresponding trigger power supply and one end of the capacitor; wherein, each trigger power supply is used to charge the capacitor in the corresponding trigger module; Each of the trigger modules is connected in parallel to the primary side of the trigger transformer through the two ends of the trigger switch.

2. The pulse thyristor parallel triggering circuit according to claim 1, characterized in that, The current-limiting resistor is connected to the first terminal of the capacitor; The second terminal of the capacitor is connected in series with the first terminal of the trigger switch, and then connected in parallel with the first terminal of the capacitor through the second terminal of the trigger switch to the primary side of the trigger transformer. The first terminal of the trigger switch is connected to the negative terminal of the trigger power supply.

3. The pulse thyristor parallel triggering circuit according to claim 1, characterized in that, The current-limiting resistor is connected to the first terminal of the capacitor; The first terminal of the capacitor is connected in series with the first terminal of the trigger switch, and then connected in parallel with the second terminal of the capacitor through the second terminal of the trigger switch to the primary side of the trigger transformer. The second terminal of the trigger switch is connected to the negative terminal of the trigger power supply.

4. The pulse thyristor parallel triggering circuit according to any one of claims 1-3, characterized in that, Each thyristor in each of the series thyristor groups is connected to one secondary side of the trigger transformer.

5. The pulse thyristor parallel triggering circuit according to any one of claims 1-3, characterized in that, The trigger switch is a MOSFET, IGBT, thyristor, transistor, or relay.

6. The pulse thyristor parallel triggering circuit according to any one of claims 1-3, characterized in that, The value of the capacitor is greater than the set threshold.

7. The pulse thyristor parallel triggering circuit according to claim 2, characterized in that, It also includes a magnetic reset module, wherein the magnetic reset circuit is connected in parallel to the primary side of the trigger transformer.

8. The pulse thyristor parallel triggering circuit according to claim 7, characterized in that, The magnetic reset module includes a bleed resistor and an anti-parallel diode.

9. A pulsed discharge system, characterized in that, It includes the pulse thyristor parallel triggering circuit as described in any one of claims 1-8, N sets of energy storage devices and a load; each set of energy storage devices is connected in series with the corresponding set of series thyristors and then connected in parallel across the load.

Images