Flyback high-voltage direct-current power supply device based on negative Marx circuit

Abstract

The invention belongs to the technical field of high-voltage direct-current power supplies, and particularly relates to a high-voltage direct-current power supply device based on a negative single-bridge-arm Marx circuit and a flyback transformer. The high-voltage direct-current power supply device comprises an input alternating-current power supply, a rectification module, a negative polarity Marx circuit module, a flyback transformer and a post-stage rectification circuit. Alternating current is converted into direct current through the rectification module, and charging input is provided for the negative polarity Marx circuit; in the negative polarity Marx circuit, the energy is transmitted to the flyback transformer through an operation mode of parallel charging and series discharging, and finally stable high-voltage direct current is output through a post-stage rectification circuit. According to the invention, the key technical problem of cooperative operation of the Marx circuit and the flyback transformer is effectively solved; according to the optimized Marx circuit structure, the system output voltage and the voltage gain are remarkably improved, and the overall power transmission efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-voltage direct current power supplies, and in particular relates to a high-voltage direct current power supply device. Technical Background

[0002] With the continuous development of electronic technology, modern electronic devices are evolving towards higher integration, smaller size and higher performance, which puts forward requirements for high power density, high frequency and high stability for power supply systems. As a key device that can provide stable high voltage output in a short time, high voltage DC power supply has been widely used in many fields. In agriculture, high voltage DC power supply is used for electrostatic atomization spraying to eliminate pests, explore the impact of static electricity on crop growth, and electrostatic treatment of seeds; in the medical field, it is widely used in high-precision diagnostic instruments such as CT imaging and X-ray equipment, providing fast and efficient high voltage support.

[0003] The present invention proposes a new circuit design scheme based on pulse power technology. Pulse power technology can store energy for a long time and release it with high power density in a very short time. Its output characteristics are mainly narrow pulse high voltage waveforms, which have certain commonalities with traditional switching power supplies. By introducing the chopper circuit structure optimized by pulse power technology, its application potential in high-voltage DC power supplies can be effectively expanded. Summary of the invention

[0004] The object of the present invention is to provide a high-voltage DC power supply device capable of high-voltage, high-frequency operation and rapid charging, so as to overcome the shortcomings of existing high-voltage DC power supply devices.

[0005] The present invention proposes a high-voltage direct current power supply device, which organically combines a negative polarity Marx circuit with a flyback transformer, and its structure includes: an input alternating current power supply, a rectifier circuit, a charging control module, a negative polarity Marx module (i.e., a negative polarity single-bridge arm Marx circuit), a flyback transformer, and a flyback rectifier output module; wherein the direct current generated by the rectifier circuit is controlled by the charging control module; the negative polarity Marx circuit half-bridge midpoint output is connected to one end of the flyback transformer, and the other end of the flyback transformer is connected to the alternating current rectifier circuit; the negative polarity Marx module is composed of a plurality of cascade units, each unit including a unidirectional diode, an energy storage capacitor, an upper bridge arm switch, and a lower bridge arm switch; wherein the charging switch (i.e., the upper bridge arm switch) is removed from the negative polarity Marx module at the last stage to avoid reverse current interference; the input alternating current power supply is rectified by the rectifier circuit, and then the negative polarity Marx module is charged by the charging control module, the negative polarity Marx circuit is connected to the flyback transformer, and finally a high-voltage direct current is output through the rectifier circuit, for details, see Figure 1 shown.

[0006] The working process of the negative polarity Marx flyback high voltage DC power supply device of the present invention is as follows:

[0007] The input AC power source is converted into a DC voltage after passing through the AC rectifier circuit. The charging mode of the DC power is controlled by the charging switch, and the DC energy storage capacitor of the negative polarity Marx circuit is charged in the parallel charging and series discharging mode. After being modulated by the multi-stage Marx circuit, the output is multiple times that of the AC rectifier circuit to obtain a DC voltage, which is boosted again through the flyback transformer, and a high-voltage DC power supply output with a periodic current constant current is obtained.

[0008] At the same time, when the negative polarity Marx circuit is charged again, the magnetic energy stored in the flyback transformer is discharged to the flyback rectifier circuit.

[0009] The present invention adopts an improved negative polarity Marx circuit topology structure and utilizes its unique parallel charging and series discharging operation mode to achieve efficient energy transfer. Combined with the flyback transformer technology, the design is similar to the flyback circuit in the traditional switching power supply in terms of function, but the flyback diode characteristics of the negative polarity Marx circuit are optimized. By eliminating the final charging switch, the reverse energy feedback problem existing in the traditional flyback circuit is effectively solved, and the stability and efficiency of the system are further improved.

[0010] The negative polarity Marx flyback high-voltage DC power supply device of the present invention has high-voltage output, high-frequency operation and fast charging capabilities, while significantly improving the voltage level and charging efficiency, and has good application prospects.

[0011] The beneficial effects of the present invention are:

[0012] 1. Negative polarity Marx circuit can generate negative high voltage square wave output.

[0013] 2. The flyback transformer can effectively limit the amplitude of the output current.

[0014] 3. By properly configuring the negative polarity Marx circuit and the ratio of the flyback transformer, the charging voltage can be significantly increased and the output current can be ensured to be constant.

[0015] The high-voltage direct current power supply device of the present invention can be used in small and medium power, high-frequency, high-voltage direct current output scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The invention discloses a negative polarity single bridge arm Marx circuit and a flyback high voltage DC power supply device.

[0017] Figure 2 It is a circuit simulation diagram.

[0018] Figure 3 This is a curve diagram of 100V DC being boosted by a negative polarity single-arm Marx circuit and a flyback transformer.

[0019] The numbers in the figure are: 1 is the input AC power supply, 2 is the AC rectifier circuit, 3 is the charging control switch, 4 is the negative polarity Marx circuit module, 5 is the unidirectional diode, 6 is the DC energy storage capacitor, 7 is the upper bridge arm switch, 8 is the lower bridge arm switch, 9 is the last stage Marx module, 10 is the flyback transformer, and 11 is the flyback rectifier circuit. DETAILED DESCRIPTION

[0020] In order to make the measures, creative features, objectives and effects achieved by the technology of the present invention easy to understand, the present invention is further described below in conjunction with specific diagrams.

[0021] Figure 1 The structure of the high-voltage DC power supply device based on the negative polarity single-bridge arm Marx circuit and the flyback transformer of the present invention is shown. The device consists of the following parts: an input AC power supply 1, an AC rectifier unit 2, a charging control switch 3, a negative polarity Marx module 4 (including a unidirectional diode 5, a DC energy storage capacitor 6, an upper bridge arm switch 7 and a lower bridge arm switch 8), a final Marx module 9, a flyback transformer 10 and a flyback rectifier circuit 11. The AC power supply 1 is connected to the rectifier unit 2, and the rectified DC power sequentially provides energy to multiple negative polarity Marx modules through the charging control switch 3, and is finally connected to the primary coil of the flyback transformer 10, and the secondary coil of the flyback transformer is connected to the flyback rectifier circuit 11 to output high-voltage DC. During the operation of the system, the input AC power is converted into DC power through the rectifier unit 2, and enters the Marx module through the charging control switch 3. The unidirectional diode 5 and the upper bridge arm switch 7 realize the parallel charging of the energy storage capacitor 6. Afterwards, the energy storage capacitor 6 transmits the electric energy to the flyback transformer 10 in series through the lower bridge arm switch 8, thereby further increasing the voltage. During this period, the magnetic energy of the flyback transformer is also converted into a stable high-voltage DC output through the rectifier circuit 11.

[0022] like Figure 2 The circuit is simulated, and the 100V DC is boosted by the negative polarity single-arm Marx circuit and the flyback transformer to obtain the following Figure 3 Results shown.

[0023] The core innovation of the present invention is to achieve primary boost through Marx module and then complete secondary boost through flyback transformer. At the same time, the flyback circuit plays a current limiting role and ensures the periodic constant of the output current. This combined design not only significantly improves the voltage gain and operating efficiency of the device, but also simplifies the overall system structure, and has high application value.

[0024] The above description describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only illustrative of the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention to be protected.

Claims

1. A high voltage DC power supply device based on a negative polarity Marx circuit and a flyback transformer, characterized in that: The structure includes: Input AC power supply, rectifier circuit, charging control module, negative polarity Marx module, flyback transformer and flyback rectifier output module; wherein the DC current generated by the rectifier circuit is controlled by the charging control module; the negative polarity Marx circuit half-bridge midpoint output is connected to one end of the flyback transformer, and the other end of the flyback transformer is connected to the AC rectifier circuit; the negative polarity Marx module is composed of multiple cascade units, each unit includes a unidirectional diode, a storage capacitor, an upper bridge arm switch, and a lower bridge arm switch; wherein the charging switch is removed in the last stage of the negative polarity Marx module to avoid reverse current interference; the input AC power supply is rectified by the rectifier circuit and then charged by the charging control module for the negative polarity Marx module, the negative polarity Marx circuit is connected to the flyback transformer, and finally outputs high voltage DC through the rectifier circuit.

2. The high voltage DC power supply device according to claim 1, characterized in that: The workflow is as follows: The input AC power source is converted into a DC voltage after passing through the AC rectifier circuit. The charging mode of the DC power is controlled by the charging switch, and the DC energy storage capacitor of the negative polarity Marx circuit is charged in the parallel charging and series discharging mode. After being modulated by the multi-stage Marx circuit, the output is multiple times that of the AC rectifier circuit to obtain a DC voltage, which is boosted again through the flyback transformer, and a high-voltage DC power supply output with a periodic current constant current is obtained. At the same time, when the negative polarity Marx circuit is charged again, the magnetic energy stored in the flyback transformer is discharged to the flyback rectifier circuit.

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