Trigger circuit and inverter parallel system

Abstract

The embodiment of the utility model provides a trigger circuit and an inverter parallel system. The trigger circuit comprises a first pulse input end, a second pulse input end, a first control module, a second control module, a first voltage transformation module, a second voltage transformation module, a first diode, a second diode, an inverter output end and a parallel operation bus, the first pulse input end is electrically connected with one end of the first control module; the other end of the first control module is electrically connected with one end of a first voltage transformation module; the other end of the first voltage transformation module is connected with the cathode of the first diode; the anode of the first diode is connected with the parallel operation bus, and the cathode is connected with the inverter output end; the second pulse input end is electrically connected with one end of the second control module; the other end of the second control module is electrically connected with one end of the second voltage transformation module; the other end of the second voltage transformation module is connected with the cathode of the second diode; the anode of the second diode is connected with the inverter output end, and the cathode is connected with the parallel operation bus. According to the embodiment of the invention, the triggering stability of the inverter can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a trigger circuit and an inverter parallel system. Background Art

[0002] At present, when inverters are connected in parallel, a relay needs to be connected in series at the output end of each inverter to achieve AC parallel operation and isolate the faulty inverter through the relay. However, the service life of the relay is only about 100,000 times. If the relay is damaged, it needs to be replaced in time, which cannot meet the stability requirements of the inverter triggering. Therefore, how to improve the stability of the inverter triggering has become a technical problem that needs to be solved urgently. Utility Model Content

[0003] The main purpose of the embodiments of the present application is to propose a trigger circuit and an inverter parallel system, aiming to construct a new trigger circuit, realize the use of thyristors instead of relays as the trigger circuit of the inverter, and improve the stability of the inverter trigger.

[0004] To achieve the above-mentioned purpose, a first aspect of an embodiment of the present application provides a trigger circuit, the trigger circuit comprising: a first pulse input terminal, a second pulse input terminal, a first control module, a second control module, a first transformer module, a second transformer module, a first diode, a second diode, an inverter output terminal and a parallel bus;

[0005] The first pulse input terminal is electrically connected to one end of the first control module and is used to input a first pulse signal to the first control module;

[0006] The other end of the first control module is electrically connected to one end of the first transformer module, and is used to control the output voltage of the first transformer module;

[0007] The other end of the first transformer module is connected to the cathode of the first diode, so as to drive the first diode to be turned on or off;

[0008] The anode of the first diode is connected to the parallel bus, and the cathode is connected to the inverter output terminal;

[0009] The second pulse input terminal is electrically connected to one end of the second control module and is used to input a second pulse signal to the second control module;

[0010] The other end of the second control module is electrically connected to one end of the second transformer module, and is used to control the output voltage of the second transformer module;

[0011] The other end of the second transformer module is connected to the cathode of the second diode, so as to drive the second diode to be turned on or off;

[0012] The anode of the second diode is connected to the inverter output terminal, and the cathode is connected to the parallel bus.

[0013] In some embodiments, the first control module includes: a first resistor and a first MOS tube; one end of the first resistor is connected to the first pulse input end, and the other end is connected to the gate of the first MOS tube, the drain of the first MOS tube is connected to the first voltage transformation module, and the source of the first MOS tube is grounded.

[0014] In some embodiments, the second control module includes: a second resistor and a second MOS tube; one end of the second resistor is connected to the second pulse input end, and the other end is connected to the gate of the second MOS tube, the drain of the second MOS tube is connected to the second voltage transformation module, and the source of the second MOS tube is grounded.

[0015] In some embodiments, the first transformer module includes: a first transformer, a third diode, a third resistor, and a fourth resistor; one end of the primary coil of the first transformer is connected to a power supply, and the other end is connected to the drain of the first MOS tube, the same end of the secondary coil of the first transformer is connected to the anode of the third diode and one end of the fourth resistor, the cathode of the third diode is connected to one end of the third resistor, the other end of the third resistor is connected to the cathode of the first diode, and the other end of the fourth resistor is connected to the cathode of the first diode.

[0016] In some embodiments, the second transformer module includes: a second transformer, a fourth diode, a fifth resistor, and a sixth resistor; one end of the primary coil of the second transformer is connected to a power supply, and the other end is connected to the drain of the second MOS tube, the same end of the secondary coil of the second transformer is connected to the anode of the fourth diode and one end of the sixth resistor, the cathode of the fourth diode is connected to one end of the fifth resistor, the other end of the third resistor is connected to the cathode of the first diode, and the other end of the fourth resistor is connected to the cathode of the first diode.

[0017] In some embodiments, the trigger circuit further includes:

[0018] A first voltage stabilizing and filtering module, wherein one end of the first voltage stabilizing and filtering module is electrically connected to a power supply, and the other end of the first voltage transforming module and the first control module;

[0019] A second voltage stabilizing and filtering module, wherein one end of the second voltage stabilizing and filtering module is electrically connected to a power supply, and the other end is connected to the second voltage transformation module and the second control module.

[0020] In some embodiments, the first voltage stabilizing and filtering module includes: a seventh resistor, an eighth resistor, a first capacitor, a second capacitor and a fifth diode; one end of the first capacitor is connected to a power supply, and the other end is grounded; one end of the seventh resistor is connected to a power supply, and the other end is connected to one end of the eighth resistor and one end of the second capacitor, the other end of the eighth resistor is connected to the cathode of the fifth diode, the other end of the second capacitor is connected to the same-name end of the primary coil of the first transformer, and the anode of the fifth diode is connected to the drain of the first MOS tube and the opposite-name end of the primary coil of the first transformer.

[0021] In some embodiments, the second voltage stabilizing and filtering module includes: a ninth resistor, a tenth resistor, a third capacitor, a fourth capacitor and a sixth diode; one end of the third capacitor is connected to the power supply, and the other end is grounded; one end of the ninth resistor is connected to the power supply, and the other end is connected to one end of the tenth resistor and one end of the fourth capacitor, the other end of the tenth resistor is connected to the cathode of the sixth diode, the other end of the fourth capacitor is connected to the same-name end of the primary coil of the second transformer, and the anode of the sixth diode is connected to the drain of the second MOS tube and the opposite-name end of the primary coil of the second transformer.

[0022] In some embodiments, the first MOS transistor and the second MOS transistor are N-channel MOS transistors.

[0023] To achieve the above-mentioned purpose, the second aspect of an embodiment of the present application proposes an inverter parallel system, which includes multiple inverters, and a trigger circuit as described in the first aspect is connected between the output end of each inverter and the parallel bus.

[0024] The trigger circuit and inverter parallel system proposed in the present application input a high-level first pulse signal and a second pulse signal through a first pulse input terminal and a second pulse input terminal to drive the first control module and the second control module to turn on, and the power flows through the first transformer module and the second transformer module to control the output voltage of the first transformer module through the first control module, thereby controlling the first diode to turn on, and at the same time, the second control module controls the output voltage of the second transformer module, thereby controlling the second diode to turn on, so that the inverter output terminal is connected to the parallel bus. Therefore, regardless of whether the inverter outputs a forward voltage or a reverse voltage, it is only necessary for the single-chip microcomputer to output a corresponding control signal through the first pulse input terminal and the second pulse input terminal to control the connection or disconnection of the inverter output terminal and the parallel bus, so as to realize the parallel triggering of multiple inverters. Therefore, by combining the transformer module, the control module and the thyristor to replace the relay as the trigger circuit, the thyristor replaces the relay, and the service life of the thyristor is much longer than that of the relay, so the trigger circuit composed of the thyristor can improve the stability of the inverter triggering. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a module block diagram of a trigger circuit provided in an embodiment of the present application;

[0026] Figure 2 It is a circuit schematic diagram of the trigger circuit provided in the embodiment of the present application.

[0027] Figure numerals: 100, first pulse input terminal; 200, second pulse input terminal; 300, first control module; 400, second control module; 500, first transformer module; 600, second transformer module; 700, first voltage stabilizing and filtering module; 800, second voltage stabilizing and filtering module; 910, inverter output terminal; 920, parallel bus. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0031] Please refer to Figure 1This embodiment discloses a trigger circuit, and the trigger circuit is used to replace the relay to realize AC parallel operation and isolate the fault inverter. The trigger circuit includes: a first pulse input terminal 100, a second pulse input terminal 200, a first control module 300, a second control module 400, a first transformer module 500, a second transformer module 600, a first diode D1, a second diode D2, an inverter output terminal 910 and a parallel bus 920. The first pulse input terminal 100 is electrically connected to one end of the first control module 300, and is used to input a first pulse signal to the first control module 300; the other end of the first control module 300 is electrically connected to one end of the first transformer module 500, and is used to control the output voltage of the first transformer module 500; the other end of the first transformer module 500 is connected to the cathode of the first diode D1, and is used to drive the first diode D1 to be turned on or off; the anode of the first diode D1 is connected to the parallel bus 920, and the cathode is connected to the inverter output terminal 910; the second pulse input terminal 200 is electrically connected to one end of the second control module 400, and is used to input a second pulse signal to the second control module 400; the other end of the second control module 400 is electrically connected to one end of the second transformer module 600, and is used to control the output voltage of the second transformer module 600; the other end of the second transformer module 600 is connected to the cathode of the second diode D2, and is used to drive the second diode D2 to be turned on or off; the anode of the second diode D2 is connected to the inverter output terminal 910, and the cathode is connected to the parallel bus 920.

[0032] It should be noted that the first pulse signal and the second pulse signal of high level are input through the first pulse input terminal 100 and the second pulse input terminal 200 to drive the first control module 300 and the second control module 400 to turn on, and the power flows through the first transformer module 500 and the second transformer module 600 to control the output voltage of the first transformer module 500 through the first control module 300, thereby controlling the first diode D1 to turn on, and at the same time, the second control module 400 controls the output voltage of the second transformer module 600, thereby controlling the second diode D2 to turn on, so that the inverter output terminal 910 is connected to the parallel bus 920. Therefore, regardless of whether the inverter outputs a forward voltage or a reverse voltage, the single-chip microcomputer only needs to output the corresponding control signal through the first pulse input terminal 100 and the second pulse input terminal 200 to control the connection or disconnection of the inverter output terminal 910 and the parallel bus 920, so as to realize the parallel triggering of multiple inverters. Therefore, by combining the transformer module, the control module and the thyristor to replace the relay as the trigger circuit, the thyristor can replace the relay, and the service life of the thyristor is much longer than that of the relay, so the trigger circuit composed of thyristors can improve the stability of the inverter triggering.

[0033] In some embodiments, the trigger circuit may further include a first voltage stabilizing filter module 700 and a second voltage stabilizing filter module 800, wherein one end of the first voltage stabilizing filter module 700 is electrically connected to the power supply, and the other end is connected to the first transformer module 500 and the first control module 300, and one end of the second voltage stabilizing filter module 800 is electrically connected to the power supply, and the other end is connected to the second transformer module 600 and the second control module 400. Therefore, by setting the first voltage stabilizing filter module 700 between the power supply and the first control module 300 and the first transformer module 500, the stable operation of the first control module 300 and the first transformer module 500 is ensured. Similarly, the second voltage stabilizing filter module 800 is set between the power supply, the second control module 400, and the second transformer module 600, so as to ensure the stable operation of the second control module 400 and the second transformer module 600.

[0034] Please refer to Figure 2 In some embodiments, the first control module 300 includes: a first resistor R1 and a first MOS transistor Q1; one end of the first resistor R1 is connected to the first pulse input terminal 100, the other end is connected to the gate of the first MOS transistor Q1, the drain of the first MOS transistor Q1 is connected to the first transformer module 500, and the source of the first MOS transistor Q1 is grounded. The second control module 400 includes: a second resistor R2 and a second MOS transistor Q2; one end of the second resistor R2 is connected to the second pulse input terminal 200, the other end is connected to the gate of the second MOS transistor Q2, the drain of the second MOS transistor Q2 is connected to the second transformer module 600, and the source of the second MOS transistor Q2 is grounded.

[0035] It should be noted that the first MOS transistor Q1 and the second MOS transistor Q2 are N-channel MOS transistors.

[0036] It should be noted that when the first pulse signal is PWM1, the second pulse signal is PWM2, and PWM1 and PWM2 are high level, the drain and source of the first MOS tube Q1 are turned on, and the power is applied to the first transformer module 500 to control the first transformer module 500 to output a high level to trigger the first diode D1 to turn on. At the same time, the drain and source of the second MOS tube Q2 are turned on, and the second transformer module 600 controls the second diode D2 to turn on, so as to achieve the connection between the inverter output terminal 910 and the parallel bus 920.

[0037] In some embodiments, the first transformer module 500 includes: a first transformer T1, a third diode D3, a third resistor R3, and a fourth resistor R4; one end of the primary coil of the first transformer T1 is connected to a power supply, and the other end is connected to the drain of the first MOS tube Q1, the same end of the secondary coil of the first transformer T1 is connected to the anode of the third diode D3 and one end of the fourth resistor R4, the cathode of the third diode D3 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to the cathode of the first diode D1, and the other end of the fourth resistor R4 is connected to the cathode of the first diode D1. The second transformer module 600 includes: a second transformer T2, a fourth diode D4, a fifth resistor R5, and a sixth resistor R6; one end of the primary coil of the second transformer T2 is connected to the power supply, and the other end is connected to the drain of the second MOS tube Q2, the same end of the secondary coil of the second transformer T2 is connected to the anode of the fourth diode D4 and one end of the sixth resistor R6, the cathode of the fourth diode D4 is connected to one end of the fifth resistor R5, the other end of the third resistor R3 is connected to the cathode of the first diode D1, and the other end of the fourth resistor R4 is connected to the cathode of the first diode D1.

[0038] It should be noted that when the first diode D1 needs to be turned on, PWM1 outputs a high level, the drain and source of the first MOS tube Q1 are turned on, the power supply VCC is added to the two ends of the primary coil of the first transformer T1, and the current passes through the first voltage stabilizing filter module 700, the primary coil of the first transformer T1, and the first MOS tube Q1 and returns to GND. The same-name end of the secondary coil of the first transformer T1 induces a positive voltage, and the current starts from the same-name end of the secondary coil, flows through the third diode D3, the third resistor R3, the gate of the first diode D1, the cathode of the first diode D1, and returns to the opposite-name end of the secondary coil of the first transformer T1, triggering the first diode D1 to turn on. When the second diode D2 needs to be turned on, PWM2 is a high level, the drain and source of the second MOS tube Q2 are turned on, the power supply VCC is added to the two ends of the primary coil of the second transformer T2, and the current passes through the second voltage stabilizing filter module 800, the primary coil of the second transformer T2, and the second MOS tube Q2 and returns to GND. A positive voltage is induced at the same-name end of the secondary coil of the second transformer T2. The current starts from the same-name end of the secondary coil, flows through the fourth diode D4, the fifth resistor R5, the gate of the second diode D2, the cathode of the second diode D2 in sequence, and returns to the opposite-name end of the secondary coil of the second transformer T2, triggering the second diode D2 to turn on, so as to realize the connection between the inverter output terminal 910 and the parallel bus 920.

[0039] In some embodiments, the first voltage stabilizing and filtering module 700 includes: a seventh resistor R7, an eighth resistor R8, a first capacitor C1, a second capacitor C2 and a fifth diode D5; one end of the first capacitor C1 is connected to the power supply, and the other end is grounded; one end of the seventh resistor R7 is connected to the power supply, and the other end is connected to one end of the eighth resistor R8 and one end of the second capacitor C2, the other end of the eighth resistor R8 is connected to the cathode of the fifth diode D5, the other end of the second capacitor C2 is connected to the same-name end of the primary coil of the first transformer T1, and the anode of the fifth diode D5 is connected to the drain of the first MOS tube Q1 and the opposite-name end of the primary coil of the first transformer T1. The second voltage stabilizing and filtering module 800 includes: a ninth resistor R9, a tenth resistor R10, a third capacitor C3, a fourth capacitor C4 and a sixth diode D6; one end of the third capacitor C3 is connected to the power supply, and the other end is grounded; one end of the ninth resistor R9 is connected to the power supply, and the other end is connected to one end of the tenth resistor R10 and one end of the fourth capacitor C4, the other end of the tenth resistor R10 is connected to the cathode of the sixth diode D6, the other end of the fourth capacitor C4 is connected to the same-name end of the primary coil of the second transformer T2, and the anode of the sixth diode D6 is connected to the drain of the second MOS tube Q2 and the opposite-name end of the primary coil of the second transformer T2.

[0040] It should be noted that by setting a voltage stabilizing filter module composed of resistors and capacitors, the noise signal in the power supply can be filtered out to provide stable power to the MOS tube and the transformer, so that the MOS tube and the transformer can work stably and improve the stability of the inverter triggering.

[0041] In summary, please refer to Figure 2 , when the first diode D1 needs to be turned on, PWM1 is at a high level, the drain and source of the first MOS tube Q1 are turned on, the power supply VCC is added to both ends of the primary coil of the first transformer T1, and the current passes through the seventh resistor R7, the primary coil of the first transformer T1, and the first MOS tube Q1 and returns to GND. The same-name end of the secondary coil of the first transformer T1 induces a positive voltage, and the current starts from the same-name end of the secondary coil, flows through the third diode D3, the third resistor R3, the gate of the first diode D1, the cathode of the first diode D1, and returns to the opposite-name end of the secondary coil of the first transformer T1, triggering the first diode D1 to turn on.

[0042] When the second diode D2 is needed, the second pulse input terminal PWM2 outputs a high level, the drain and source of the second MOS tube Q2 are turned on, the power supply VCC is added to the two ends of the primary coil of the second transformer T2, and the current passes through the ninth resistor R9, the primary coil of the second transformer T2, and the second MOS tube Q2 and returns to GND. The same-name end of the secondary coil of the second transformer T2 induces a positive voltage, and the current starts from the same-name end of the secondary coil, flows through the fourth diode D4, the fifth resistor R5, the gate of the second diode D2, the cathode of the second diode D2, and returns to the opposite-name end of the secondary coil of the second transformer T2, triggering the second diode D2 to turn on.

[0043] When the first diode D1 needs to be turned off, the first pulse input terminal PWM1 outputs a low level, the first MOS tube Q1 is turned off, and the absorption circuit composed of the fifth diode D5, the second capacitor C2 and the eighth resistor R8 provides a freewheeling path for the first transformer T1. The same-name end of the secondary coil of the first transformer T1 induces a negative voltage, and the third diode D3 is reversely cut off. The gate voltage of the first diode D1 is lower than the cathode, and the first diode D1 is maintained in the on state by the current from the anode to the cathode. When the current of the first diode D1 is zero, the first diode D1 is turned off. The principle of turning off the second diode D2 is the same as that of D1.

[0044] When a high-frequency pulse signal is given to the first pulse input terminal PWM1, the first diode D1 can pass through the negative current of the low-frequency sine waveform output by the inverter output terminal AC_IN, and when a high-frequency pulse signal is given to the second pulse input terminal PWM2, the second diode D2 can pass through the positive current of the low-frequency sine waveform output by the parallel bus AC_IN. Although it is possible to decide when to turn on the first diode D1 or the second diode D2 according to the phase of the inverter output current, capturing the current phase requires higher-frequency sampling and more complex data processing, especially when the inverter is parallel or suddenly connected to an inductive load, the current waveform is distorted and the frequency becomes higher. Therefore, when the first diode and the second diode need to be turned on, the first diode D1 and the second diode D2 are turned on at the same time, and when the first diode and the second diode need to be turned off, the first diode D1 and the second diode D2 are turned off at the same time, similar to a relay. However, when the first pulse input terminal PWM1 and the second pulse input terminal PWM2 are high at the same time, the voltage between the cathode and the anode of the first diode D1 and the second diode D2 will be clamped to each other, resulting in no voltage difference between the cathode and the anode, and the thyristor cannot be turned on. The utility model sets the duty cycle of the pulse signals PWM1 and PWM2 to 0.2, the frequency to 25kHz, and makes the phase difference between PWM1 and PWM2 180 degrees, so that the first diode D1 and the second diode D2 are not triggered at the same time, and there is always a trigger signal, so that low-frequency alternating current can pass freely without the need for complex control logic.

[0045] In addition, this embodiment also discloses an inverter parallel system, which includes a plurality of inverters, and a trigger circuit as described above is connected between the output end of each inverter and the parallel bus.

[0046] Those skilled in the art will appreciate that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0047] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0048] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0049] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0050] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0051] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0052] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the rights of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present invention should be within the scope of the rights of the present invention.

Claims

1. A trigger circuit, characterized in that: The trigger circuit comprises: a first pulse input terminal, a second pulse input terminal, a first control module, a second control module, a first voltage transformation module, a second voltage transformation module, a first diode, a second diode, an inverter output terminal and a parallel bus; The first pulse input terminal is electrically connected to one end of the first control module and is used to input a first pulse signal to the first control module; The other end of the first control module is electrically connected to one end of the first transformer module, and is used to control the output voltage of the first transformer module; The other end of the first transformer module is connected to the cathode of the first diode, so as to drive the first diode to be turned on or off; The anode of the first diode is connected to the parallel bus, and the cathode is connected to the inverter output terminal; The second pulse input terminal is electrically connected to one end of the second control module and is used to input a second pulse signal to the second control module; The other end of the second control module is electrically connected to one end of the second transformer module, and is used to control the output voltage of the second transformer module; The other end of the second transformer module is connected to the cathode of the second diode, so as to drive the second diode to be turned on or off; The anode of the second diode is connected to the inverter output terminal, and the cathode is connected to the parallel bus.

2. The trigger circuit according to claim 1, characterized in that: The first control module includes: a first resistor and a first MOS tube; one end of the first resistor is connected to the first pulse input end, and the other end is connected to the gate of the first MOS tube, the drain of the first MOS tube is connected to the first voltage transformation module, and the source of the first MOS tube is grounded.

3. The trigger circuit according to claim 2, characterized in that: The second control module includes: a second resistor and a second MOS tube; one end of the second resistor is connected to the second pulse input end, and the other end is connected to the gate of the second MOS tube, the drain of the second MOS tube is connected to the second voltage transformation module, and the source of the second MOS tube is grounded.

4. The trigger circuit according to claim 2, characterized in that: The first transformer module includes: a first transformer, a third diode, a third resistor, and a fourth resistor; one end of the primary coil of the first transformer is connected to a power supply, and the other end is connected to the drain of the first MOS tube, the same end of the secondary coil of the first transformer is connected to the anode of the third diode and one end of the fourth resistor, the cathode of the third diode is connected to one end of the third resistor, the other end of the third resistor is connected to the cathode of the first diode, and the other end of the fourth resistor is connected to the cathode of the first diode.

5. The trigger circuit according to claim 4, characterized in that: The second transformer module includes: a second transformer, a fourth diode, a fifth resistor, and a sixth resistor; one end of the primary coil of the second transformer is connected to the power supply, and the other end is connected to the drain of the second MOS tube, the same end of the secondary coil of the second transformer is connected to the anode of the fourth diode and one end of the sixth resistor, the cathode of the fourth diode is connected to one end of the fifth resistor, the other end of the third resistor is connected to the cathode of the first diode, and the other end of the fourth resistor is connected to the cathode of the first diode.

6. The trigger circuit according to claim 5, characterized in that: The trigger circuit also includes: A first voltage stabilizing and filtering module, wherein one end of the first voltage stabilizing and filtering module is electrically connected to a power supply, and the other end of the first voltage transforming module and the first control module; A second voltage stabilizing and filtering module, wherein one end of the second voltage stabilizing and filtering module is electrically connected to a power supply, and the other end is connected to the second voltage transformation module and the second control module.

7. The trigger circuit according to claim 6, characterized in that: The first voltage stabilizing and filtering module includes: a seventh resistor, an eighth resistor, a first capacitor, a second capacitor and a fifth diode; one end of the first capacitor is connected to a power supply, and the other end is grounded; one end of the seventh resistor is connected to a power supply, and the other end is connected to one end of the eighth resistor and one end of the second capacitor, the other end of the eighth resistor is connected to the cathode of the fifth diode, the other end of the second capacitor is connected to the same-name end of the primary coil of the first transformer, and the anode of the fifth diode is connected to the drain of the first MOS tube and the opposite-name end of the primary coil of the first transformer.

8. The trigger circuit according to claim 6, characterized in that: The second voltage stabilizing and filtering module includes: a ninth resistor, a tenth resistor, a third capacitor, a fourth capacitor and a sixth diode; one end of the third capacitor is connected to a power supply, and the other end is grounded; one end of the ninth resistor is connected to a power supply, and the other end is connected to one end of the tenth resistor and one end of the fourth capacitor, the other end of the tenth resistor is connected to the cathode of the sixth diode, the other end of the fourth capacitor is connected to the same-name end of the primary coil of the second transformer, and the anode of the sixth diode is connected to the drain of the second MOS tube and the opposite-name end of the primary coil of the second transformer.

9. The trigger circuit according to any one of claims 3 to 8, characterized in that: The first MOS tube and the second MOS tube are N-channel MOS tubes.

10. An inverter parallel system, characterized in that: The inverter parallel system comprises a plurality of inverters, and a trigger circuit as claimed in any one of claims 1 to 9 is connected between the output end of each inverter and the parallel bus.

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