Intercepting type negative polarity Marx flyback type high-voltage direct-current power supply device

Abstract

The invention belongs to the technical field of high-voltage direct-current power supplies, and particularly relates to a cut-off type negative polarity Marx flyback type high-voltage direct-current power supply device. The high-voltage direct-current power supply device comprises an input alternating-current power supply, an alternating-current rectification module, an improved cut-off type negative polarity Marx circuit, a flyback transformer and a post-stage rectification circuit, an input alternating current power supply is converted into direct current through the rectification module, and a charging power supply is provided for the negative polarity Marx circuit. Through parallel charging and series discharging of the negative polarity Marx circuit, energy is transmitted to the flyback transformer and is further boosted under the flyback circuit, and finally stable high-voltage direct current is output through the rectifying circuit. According to the invention, the key technical problem of cooperative work of the negative polarity Marx circuit and the flyback transformer is effectively solved; the improved cut-off type negative polarity Marx circuit has the capacity of providing high-voltage output, the voltage gain and the power transmission efficiency of the system are remarkably improved, and miniaturization and high performance of a high-voltage direct-current power supply are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of high - voltage DC power supplies, and particularly relates to a high - voltage DC power supply device. Background Art

[0002] A high - voltage DC power supply is a device that can quickly output a highly stable DC voltage and has a wide range of applications in many fields. For example, in environmental protection, it can be used in electrostatic precipitators and gas purification devices to effectively capture particulate matter in industrial waste gas; in scientific experiments, it is widely used in particle accelerators and high - energy physics experimental equipment; in new energy technologies, it provides key assistance for fuel cells and energy storage systems.

[0003] Pulse power technology has the characteristics of energy storage and rapid release, and is the core means of high - power - density transmission. By storing energy for a long time and completing compression and release in an extremely short time, this technology can achieve the output of a narrow - pulse high - voltage square wave. Compared with traditional switching power supplies, pulse power technology shows stronger voltage regulation and energy transfer potential. In view of its application potential, on the basis of technical optimization, the present invention explores the feasibility of applying it to high - voltage switched - mode DC power supplies, providing an innovative solution for improving system efficiency and voltage performance. Summary of the Invention

[0004] The present invention aims to provide an improved current - cutoff type negative - polarity Marx flyback high - voltage DC power supply device to improve the efficiency and stability of the system.

[0005] The current - cutoff type negative - polarity Marx flyback high - voltage DC power supply device of the present invention includes an input AC power supply, an AC rectification circuit, a charging control switch, a current - cutoff type negative - polarity Marx circuit, a flyback transformer, and a flyback rectification circuit; wherein, after the input AC power supply is converted into direct current through a rectification module, it provides a charging power supply for the current - cutoff type negative - polarity Marx circuit; the direct current output by the AC rectification circuit is controlled by the charging control switch; the current - cutoff type negative - polarity Marx circuit is an improvement on the traditional negative - polarity Marx circuit, that is, a reverse diode (i.e., a current - cutoff tube) is added to each stage of the traditional negative - polarity Marx circuit to cut off the energy feedback path; specifically, the current - cutoff type negative - polarity Marx circuit is composed of multiple series - connected current - cutoff type negative - polarity Marx circuit modules; the current - cutoff type negative - polarity Marx circuit module includes the following components: a unidirectional diode, a DC energy - storage capacitor, an upper - arm switch, a lower - arm switch, and an upper - arm current - cutoff diode; the half - bridge mid - point output terminal of the current - cutoff type negative - polarity Marx circuit is connected to one end of the flyback transformer, and the other end of the flyback transformer is connected to the AC rectification circuit. See specifically Figure 1 as shown.

[0006] The current-limiting negative-polarity Marx flyback high-voltage DC power supply device of the present invention has the following working process:

[0007] The input AC power supply is first converted into direct current through an AC rectification circuit, and the charging mode of the direct current is controlled by a charging control switch; the charging mode adopts the method of parallel charging and series discharging. Among them, the direct current charges the DC energy storage capacitor in the current-limiting negative-polarity Marx circuit through parallel charging; when the charging is completed, the current-limiting negative-polarity Marx circuit enters the discharging mode, releases the stored energy to the flyback transformer, and thus performs energy conversion; during the discharging process, the flyback transformer not only provides high-voltage energy for the load, but also stores magnetic energy in its magnetic core; while the current-limiting negative-polarity Marx circuit is charging, the magnetic energy in the flyback transformer is transferred to the flyback rectification circuit, completing further energy conversion and outputting stable high-voltage direct current.

[0008] The present invention adopts a current-limiting negative-polarity Marx circuit, whose core working mechanism is parallel charging and series discharging, and combines the high-efficiency isolation and step-up characteristics of the flyback circuit to design a new high-voltage DC power supply solution. However, there is a problem of mismatch in the freewheeling characteristics between the traditional Marx circuit and the flyback circuit, which may lead to reverse energy feedback. In response to this, the present invention adds reverse diodes in each stage of the circuit to cut off the energy feedback path, thereby realizing more efficient and stable circuit operation.

[0009] The present invention can not only significantly improve the voltage output and energy transmission efficiency, but also meet the rapid response requirements in high-voltage and high-frequency scenarios. The high-performance DC power supply device based on the combination of the current-limiting negative-polarity Marx and the flyback circuit is suitable for modern fields that require high voltage, high frequency, and fast charging.

[0010] The beneficial effects of the present invention are:

[0011] 1. A high-voltage square wave with a negative current can be output through the current-limiting negative-polarity Marx circuit.

[0012] 2. Compared with a common flyback transformer, the restriction on the output current is reduced.

[0013] 3. By matching the turns ratio of the current-limiting negative-polarity Marx circuit and the flyback transformer, the charging voltage and the current value with a constant output period can be greatly improved. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of a current-limiting negative-polarity Marx flyback high-voltage DC power supply device of the present invention.

[0015] Figure 2 It is a simulation diagram of the circuit.

[0016] Figure 3 It is a curve graph of boosting 100V DC through a negative-polarity current-intercepting Marx circuit and a flyback transformer.

[0017] Reference numerals in the figure: 1 is the input AC power supply, 2 is the AC rectification circuit, 3 is the charging control switch, 4 is the current-intercepting negative-polarity Marx 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 upper-bridge-arm current-intercepting diode, 10 is the nth-stage current-intercepting negative-polarity Marx module, 11 is the flyback transformer, and 12 is the flyback rectification circuit. Specific implementation mode

[0018] In order to make the measures, creative features, achieved purposes and effects of the technical implementation of the present invention easy to understand, the present invention will be further described below with reference to specific illustrations.

[0019] Figure 1 It is a schematic structural diagram of a current-intercepting negative-polarity Marx flyback high-voltage DC power supply device of the present invention. It includes an input AC power supply 1, an AC rectification circuit 2, a charging control switch 3, a current-intercepting negative-polarity Marx module 4, a unidirectional diode 5, a DC energy storage capacitor 6, an upper-bridge-arm switch 7, a lower-bridge-arm switch 8, an upper-bridge-arm current-intercepting diode 9, an nth-stage current-intercepting negative-polarity Marx module 10, a flyback transformer 11, and a flyback rectification circuit 12. The input AC power supply 1 is connected to the AC rectification circuit 2, the AC rectification circuit 2 is connected to the charging control switch 3, the charging control switch 3 is connected to the current-intercepting negative-polarity Marx module 4, the current-intercepting negative-polarity Marx module 4 is connected to the nth-stage current-intercepting negative-polarity Marx module 10, one end of the primary side of the nth-stage current-intercepting negative-polarity Marx module 10 is connected to the primary side of the flyback transformer 11, the other end of the primary side of the flyback transformer 11 is connected to one end of the AC rectification circuit 2, and the secondary side of the flyback transformer 11 is connected to the flyback rectification circuit 12. And for the current-intercepting negative-polarity Marx module 4, the lower end of the unidirectional diode 5 is connected to the charging control switch 3, the upper end of the unidirectional diode 5 is connected to the lower end of the DC energy storage capacitor 6 and the lower end of the lower-bridge-arm switch 8, and is also connected to the next-stage current-intercepting negative-polarity Marx module. The upper end of the DC energy storage capacitor 6 is connected to the upper end of the upper-bridge-arm current-intercepting diode 9. The lower end of the upper-bridge-arm switch 7 is connected to the upper end of the lower-bridge-arm switch 8, and is also connected to the upper end of the DC charging capacitor of the next-stage current-intercepting negative-polarity Marx module. The upper end of the upper-bridge-arm switch 7 is connected to the lower end of the upper-bridge-arm current-intercepting diode 9.

[0020] When the present invention works, first, the input AC power supply 1 is rectified by the AC rectification circuit 2 to become a DC power supply. After being rectified by the AC rectification circuit 2, the DC power supply charges the DC energy storage capacitor 6 in parallel through the charging control switch 3, the unidirectional diode 5 of the current-limiting negative-polarity Marx module, and the upper-bridge-arm switch 7. Then, the DC energy storage capacitor 6 discharges in series to the flyback transformer 11 through the lower-bridge-arm switch 8 of the current-limiting negative-polarity Marx module. When the DC energy storage capacitor 6 is charged in parallel again through the unidirectional diode 5 of the current-limiting negative-polarity Marx module and the upper-bridge-arm switch 7, the magnetic energy stored in the flyback transformer 11 discharges to the flyback rectification circuit 12. Finally, the flyback rectification circuit 12 can obtain a controllable high-voltage DC power.

[0021] Such as Figure 2 The circuit is simulated. After the 100V DC is boosted by the negative-polarity current-limiting Marx circuit and the flyback transformer, the result is as Figure 3 shown.

[0022] The present invention uses a current-limiting negative-polarity Marx to obtain a primary high voltage, and then obtains a higher voltage through the secondary boosting of the flyback transformer. Moreover, the flyback transformer circuit can also limit the current to obtain a current with a constant period. The design of the present invention is unique and ingenious.

[0023] The above description illustrates the basic principle, main features, and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A current-cutting negative polarity Marx flyback high-voltage DC power supply device, characterized in that: The invention comprises an input AC power supply, an AC rectifier circuit, a charging control switch, a current-cutting negative polarity Marx circuit, a flyback transformer and a flyback rectifier circuit; wherein, after the input AC power supply is converted into DC power by a rectifier module, a charging power supply is provided for the current-cutting negative polarity Marx circuit; the DC power output by the AC rectifier circuit is controlled by the charging control switch; the current-cutting negative polarity Marx circuit is an improvement on the traditional negative polarity Marx circuit, that is, a reverse diode, i.e., a current-cutting tube, is added to each stage of the traditional negative polarity Marx circuit to cut off the energy feedback path; specifically, the current-cutting negative polarity Marx circuit is composed of a plurality of current-cutting negative polarity Marx circuit modules connected in series; the current-cutting negative polarity Marx circuit module comprises the following elements: a unidirectional diode, a DC energy storage capacitor, an upper bridge arm switch, a lower bridge arm switch, and an upper bridge arm current-cutting diode; the half-bridge midpoint output end of the current-cutting negative polarity Marx circuit is connected to one end of the flyback transformer, and the other end of the flyback transformer is connected to the AC 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 is first converted into DC power through an AC rectifier circuit, and the DC power controls its charging mode through a charging control switch; the charging mode adopts parallel charging and series discharging, wherein the DC power charges the DC energy storage capacitor in the cut-off negative polarity Marx circuit through parallel charging; when charging is completed, the cut-off negative polarity Marx circuit enters the discharge mode, and releases the stored energy to the flyback transformer, thereby converting energy; during the discharge process, the flyback transformer not only provides high-voltage energy to the load, but also stores magnetic energy in its magnetic core; while the cut-off negative polarity Marx circuit is charging, the magnetic energy in the flyback transformer is transferred to the flyback rectifier circuit, completing further energy conversion and outputting stable high-voltage DC power.

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