Impulse current generator

Abstract

The utility model provides an impulse current generator including a control module, a PWM chopping boost module and an impulse current generation module, the impulse current generation module includes a resistor R1, a capacitor C1, a resistor R2, an inductor L1 and a silicon controlled rectifier switch SCR1, and the control electrode of the silicon controlled rectifier switch SCR1 is connected with the output end of the control module. According to the impulse current generator provided by the utility model, the capacitor C1 is charged through the PWM chopping boost module, the charging efficiency is improved, the size of a charging circuit is reduced, the silicon controlled rectifier switch SCR1 is used as a discharge switch, the instantaneous conduction of an RLC discharge loop is realized, 8 / 20 microseconds impulse current is formed, the silicon controlled rectifier switch is extremely low in influence of temperature and humidity, electric sparks are not generated, and the service life of the impulse current generator is prolonged. The adverse effects of electric shock burn, pollution and the like do not exist, and the reliability of the impulse current generator is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of current generating devices, in particular to an impulse current generator. Background Art

[0002] 8 / 20μs impulse current generator is widely used in the performance testing of surge protective devices (SPD) for indirect and direct effects of lightning or other transient overvoltages.

[0003] Traditional 8 / 20μs impulse current generators generally use AC linear step-up transformers and rectifier filter circuits to convert low-voltage AC into high-voltage DC. This design is inefficient and the impulse current generator is large. The discharge switch usually uses a gas spark gap switch, which places high demands on the withstand voltage and overcurrent capabilities of the gas spark gap switch. The gas spark gap switch is affected by factors such as temperature and humidity changes and the degree of burns on the trigger ball surface, which can easily cause the switch to fail to be triggered or to be triggered prematurely, resulting in poor stability of the impulse current generator.

[0004] Currently, the impulse current generators on the market generally use a single-button control method, which cannot provide good human-computer interaction; they do not support Ethernet port communication or PC remote control, and the safety of operators is at risk. Utility Model Content

[0005] The purpose of the utility model is to provide an impulse current generator, which can solve one or more of the above-mentioned problems in the prior art.

[0006] According to one aspect of the utility model, an impulse current generator is provided, including a control module, a PWM chopper boost module and an impulse current generating module, wherein the input end of the PWM chopper boost module is connected to the output end of the control module, the PWM chopper boost module is used to output high-voltage direct current according to the instruction of the control module, the output end of the PWM chopper boost module is connected to the impulse current generating module, the impulse current generating module includes a resistor R1, a capacitor C1, a resistor R2, an inductor L1 and a thyristor switch SCR1, the control electrode of the thyristor switch SCR1 is connected to the output end of the control module, the anode of the thyristor switch SCR1 is respectively connected to the resistor R1 and the capacitor C1, the other end of the resistor R1 is connected to the output end of the PWM chopper boost module, the other end of the capacitor C1 is respectively connected to the output end of the PWM chopper boost module and the high-voltage output end HV OUT, and the cathode of the thyristor switch SCR1 is sequentially connected to the high-voltage output end COM OUT through the resistor R2 and the inductor L1.

[0007] In some implementations, the control module uses a chip model STM32F427ZGT6.

[0008] In some implementations, the PWM chopper boost module uses a chip model SG3525AP013TR.

[0009] In some embodiments, an input module is further included, and an output end of the input module is connected to an input end of the control module.

[0010] In some embodiments, the input module is at least one of a key and a touch display screen.

[0011] In some embodiments, an output module is further included, wherein an input end of the output module is connected to an output end of the control module.

[0012] In some embodiments, the output module is at least one of an indicator light and a touch display screen.

[0013] In some embodiments, a communication module is further included, the communication module is connected to the control module, and the communication module is used to establish a communication connection with other electronic devices.

[0014] The impulse current generator provided by the utility model charges the capacitor C1 through a PWM chopper boost module, thereby improving the charging efficiency and reducing the volume of the charging circuit. The thyristor switch SCR1 is used as a discharge switch to achieve instantaneous conduction of the RLC discharge loop and form an 8 / 20μs impulse current. The thyristor switch is extremely less affected by temperature and humidity, does not generate electric sparks, and does not have adverse effects such as electric shock burns and pollution, thereby greatly improving the reliability of the impulse current generator.

[0015] In addition, in the technical solution of the present utility model, unless otherwise specified, the technical solution can be implemented by adopting conventional means in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic structural diagram of an impulse current generator provided in one embodiment of the utility model.

[0018] Figure 2 A partial circuit diagram of an impulse current generator provided in one embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Example:

[0021] In this embodiment, refer to the attached manual Figure 1-2 , an impulse current generator is provided, including a control module 1, a PWM chopping boost module 2 and an impulse current generating module 3.

[0022] Among them, the input end of the PWM chopping boost module 2 is connected to the output end of the control module 1, the PWM chopping boost module 2 is used to output high-voltage direct current according to the instruction of the control module 1, the size of the high-voltage direct current is a preset value, and the output end of the PWM chopping boost module 2 is connected to the impulse current generation module 3.

[0023] The impulse current generating module 3 may include a resistor R1, a capacitor C1, a resistor R2, an inductor L1 and a thyristor switch SCR1, the control electrode of the thyristor switch SCR1 is connected to the output end of the control module, the anode of the thyristor switch SCR1 is connected to the resistor R1 and the capacitor C1 respectively, the other end of the resistor R1 is connected to the output end of the PWM chopper boost module, the other end of the capacitor C1 is connected to the output end of the PWM chopper boost module and the high-voltage output end HV OUT respectively, and the cathode of the thyristor switch SCR1 is connected to the high-voltage output end COM OUT via the resistor R2 and the inductor L1 in sequence.

[0024] The output end of the PWM chopper boost module 2 is connected to the input end of the control module 1. When the high-voltage direct current output by the PWM chopper boost module 2 charges the capacitor C1, the PWM chopper boost module 2 can feed back the charging progress to the control module 1 in real time.

[0025] Therefore, the capacitor C1 is charged through the PWM chopper boost module 2, which improves the charging efficiency and reduces the volume of the charging circuit. The thyristor switch SCR1 is used as the discharge switch to achieve instantaneous conduction of the RLC discharge circuit, and can generate an 8 / 20μs impulse current wave with a rise time of 8μs and a duration of 20μs. The thyristor switch is extremely less affected by temperature and humidity and does not generate electric sparks, avoiding the problem of unstable triggering of impulse current waves caused by temperature and humidity changes, electric shock and burns, and greatly improving the reliability of the impulse current generator.

[0026] In an optional embodiment, the PWM chopping boost module 2 outputs 6KV direct current.

[0027] In an optional embodiment, the control module 1 may use a chip of type STM32F427ZGT6. Thus, the control module 1 can realize unified control of the PWM chopping boost module 2 and the impulse current generating module 3.

[0028] In an optional embodiment, the PWM chopper boost module 2 may use a chip of model SG3525AP013TR. Thus, the capacitor C1 is charged by the high-voltage direct current output by the PWM chopper boost module 2, thereby improving the charging efficiency and effectively reducing the volume of the charging circuit.

[0029] In an optional embodiment, the impulse current generator further includes an input module 4, and the output end of the input module 4 is connected to the input end of the control module 1. Specifically, the input module 4 can be at least one of a button and a touch screen. In some embodiments, the input module 4 can include both a button and a touch screen, and the control module 1 can receive instructions input by the operator through the button and the touch screen, and control the impulse current generator after analysis. The button and the touch screen can realize the human-computer interaction function, have a good human-computer interaction experience, and effectively improve the convenience of using the impulse current generator.

[0030] The touch screen can be an LCD touch screen.

[0031] In an optional embodiment, the impulse current generator further includes an output module 5, and the input end of the output module 5 is connected to the output end of the control module 1. Specifically, the output module 5 is at least one of an indicator light and a touch display screen. In some embodiments, the output module 5 may include both an indicator light and a touch display screen, the indicator light may receive a signal from the control module 1 and display a corresponding control state, and the touch display screen may receive a signal from the control module 1 and display the setting information and operating state of the impulse current generator in real time.

[0032] In an optional embodiment, the impulse current generator further includes a communication module 6, which is connected to the control module 1, and the communication module 6 is used to establish a communication connection with other electronic devices. Specifically, the other electronic device may be a PC terminal, and the impulse current generator establishes a communication connection with the PC terminal through the communication module 6 to achieve remote control and effectively ensure the safety of the operator. Specifically, the communication module 6 may be an Ethernet communication module.

[0033] The working process of the impulse current generator provided by the utility model is as follows: the control module 1 receives the parameters input by the operator, the control module 1 controls the PWM chopper boost module 2 to generate a high-voltage direct current of a predetermined value, the PWM chopper boost module 2 charges the capacitor C1 through the resistor R1, the PWM chopper boost module 2 can feed back the charging process to the control module 1 in real time, when the control module 1 receives the feedback that the charging is completed, the control module 1 controls the PWM chopper boost module 2 to stop charging, and at the same time the control module 1 sends a square wave trigger pulse signal to the thyristor switch SCR1, after the thyristor switch SCR1 receives the square wave trigger pulse signal sent by the control module 1, the thyristor switch SCR1 is turned on, the capacitor C1 and the thyristor switch SCR1 connected to the capacitor C1, the resistor R2 and the inductor L1, form an RLC discharge circuit, generate an 8 / 20μs impulse current wave with a rise time of 8μs and a duration of 20μs, and the impulse current can reach 10kA.

[0034] The impulse current generator provided by the utility model charges the capacitor C1 through a PWM chopper boost module, thereby improving the charging efficiency and reducing the volume of the charging circuit. The thyristor switch SCR1 is used as a discharge switch to achieve instantaneous conduction of the RLC discharge loop and form an 8 / 20μs impulse current. The thyristor switch is extremely less affected by temperature and humidity, does not generate electric sparks, and does not have adverse effects such as electric shock burns and pollution, thereby greatly improving the reliability of the impulse current generator.

[0035] The above is only an optional implementation of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An impulse current generator, characterized in that: Including control module, PWM chopper boost module and impulse current generation module, The input end of the PWM chopping boost module is connected to the output end of the control module, the PWM chopping boost module is used to output high-voltage direct current according to the instruction of the control module, and the output end of the PWM chopping boost module is connected to the impulse current generating module. The impulse current generating module includes a resistor R1, a capacitor C1, a resistor R2, an inductor L1 and a thyristor switch SCR1. The control electrode of the thyristor switch SCR1 is connected to the output end of the control module, the anode of the thyristor switch SCR1 is connected to the resistor R1 and the capacitor C1 respectively, the other end of the resistor R1 is connected to the output end of the PWM chopper boost module, the other end of the capacitor C1 is connected to the output end of the PWM chopper boost module and the high-voltage output end HV OUT respectively, and the cathode of the thyristor switch SCR1 is connected to the high-voltage output end COMOUT through the resistor R2 and the inductor L1 in sequence.

2. The impulse current generator according to claim 1, characterized in that: The control module uses a chip of type STM32F427ZGT6.

3. The impulse current generator according to claim 1, characterized in that: The PWM chopping boost module adopts a chip of model SG3525AP013TR.

4. The impulse current generator according to claim 1, characterized in that: It also includes an input module, the output end of the input module is connected to the input end of the control module.

5. The impulse current generator according to claim 4, characterized in that: The input module is at least one of a key and a touch display screen.

6. The impulse current generator according to claim 1, characterized in that: It also includes an output module, the input end of the output module is connected to the output end of the control module.

7. The impulse current generator according to claim 6, characterized in that: The output module is at least one of an indicator light and a touch display screen.

8. The impulse current generator according to claim 1, characterized in that: It also includes a communication module, which is connected to the control module and is used to establish a communication connection with other electronic devices.

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