阅读说明：本技术 一种直流高压转直流低压变换器电路及变换方法 (Direct-current high-voltage to direct-current low-voltage converter circuit and conversion method ) 是由 李成祖 罗中省 王海涛 于 2020-11-12 设计创作，主要内容包括：本发明公开了一种直流高压转直流低压变换器电路及变换方法,电路包括：N路全桥电路、变压器、后级整流滤波电路和驱动控制电路,其中,所述N路全桥电路依次串联连接,将所述直流高压,逆变成所需交流高压；其中每一路全桥电路的输入负端与下一路全桥电路的输入正端串联连接,第一路全桥电路输入正端连接输入高压端,第N路全桥单路输入负端连接输入低压端,每路全桥电路的输出端依次连接所述变压器的输入端,所述变压器将所述交流高压降到交流低压；所述变压器的输出端连接后级整流滤波电路,后级整流滤波电路将所述交流低压变成直流低压；所述驱动控制电路为所述N路全桥电路提供驱动,并对所述直流低压进行稳压。(The invention discloses a circuit and a method for converting direct current high voltage into direct current low voltage converter, wherein the circuit comprises: the device comprises N paths of full-bridge circuits, a transformer, a post-stage rectification filter circuit and a drive control circuit, wherein the N paths of full-bridge circuits are sequentially connected in series to invert the direct-current high voltage into the required alternating-current high voltage; the input negative end of each full-bridge circuit is connected with the input positive end of the next full-bridge circuit in series, the input positive end of the first full-bridge circuit is connected with the input high-voltage end, the input negative end of the Nth full-bridge circuit is connected with the input low-voltage end, the output end of each full-bridge circuit is sequentially connected with the input end of the transformer, and the transformer reduces the alternating-current high voltage to the alternating-current low voltage; the output end of the transformer is connected with a rear-stage rectification filter circuit, and the rear-stage rectification filter circuit converts the alternating-current low voltage into direct-current low voltage; the drive control circuit provides drive for the N-path full-bridge circuit and stabilizes the direct current low voltage.)

1. A dc high voltage to dc low voltage converter circuit, comprising: n paths of full bridge circuits, a transformer, a post-stage rectification filter circuit and a drive control circuit, wherein,

the N paths of full-bridge circuits are sequentially connected in series, and the direct-current high voltage is inverted into the required alternating-current high voltage; the input negative end of each full-bridge circuit is connected with the input positive end of the next full-bridge circuit in series, the input positive end of the first full-bridge circuit is connected with the input high-voltage end, the input negative end of the Nth full-bridge circuit is connected with the input low-voltage end, the output end of each full-bridge circuit is sequentially connected with the input end of the transformer, and the transformer reduces the alternating-current high voltage to the alternating-current low voltage; the output end of the transformer is connected with a rear-stage rectification filter circuit, and the rear-stage rectification filter circuit converts the alternating-current low voltage into direct-current low voltage; the drive control circuit provides drive for the N-path full-bridge circuit and stabilizes the direct current low voltage.

2. The circuit of claim 1, wherein the positive input terminal of the N full-bridge circuit receives a dc voltage of 11.2kV to 16.8kV, the negative input terminal of the N receives a voltage of 0, and the positive input terminal of the N receives a dc voltage greater than the dc voltage received by the positive input terminal of the N +1 th input terminal.

3. The circuit of claim 1, wherein N-20.

4. The circuit of claim 1, wherein the high dc voltage is 14kV, the low ac voltage is 700V, and the low dc voltage is 700V.

5. The circuit of claim 1, further comprising an auxiliary power supply for providing an operating voltage to the drive control circuit.

6. A method of voltage conversion using the circuit of any of claims 1-5, comprising:

the direct-current high voltage is inverted into required alternating-current high voltage through the N-path full bridge circuit;

the alternating-current high voltage is reduced to alternating-current low voltage through the transformer;

the alternating current low voltage is converted into direct current low voltage through the rear-stage rectification filter circuit;

the drive control circuit provides drive for the N-path full-bridge circuit and stabilizes the direct current low voltage.

Technical Field

The invention relates to the field of high-voltage converters, in particular to a direct-current high-voltage to direct-current low-voltage converter circuit and a direct-current high-voltage to direct-current low-voltage converter converting method.

Background

For the power supply of a radar with dozens of MW levels, if low-voltage AC380V is adopted, the current can reach hundreds of thousands of amperes, the heat productivity is brought, meanwhile, the number of power supply cables is greatly increased, and the radar withdrawal is seriously influenced; if high-voltage power supply is adopted, the power supply current is greatly reduced, and the number of cables is greatly reduced. There is a trend towards high voltage DC-DC converters.

Disclosure of Invention

The invention aims to provide a direct current high-voltage to direct current low-voltage converter circuit and a conversion method, which are used for solving the problems of low-voltage power supply efficiency and excessive power supply cables.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the present invention provides a dc high-voltage to dc low-voltage converter circuit, including: the method comprises the following steps: n paths of full bridge circuits, a transformer, a post-stage rectification filter circuit and a drive control circuit, wherein,

the N paths of full-bridge circuits are sequentially connected in series, and the direct-current high voltage is inverted into the required alternating-current high voltage; the input negative end of each full-bridge circuit is connected with the input positive end of the next full-bridge circuit in series, the input positive end of the first full-bridge circuit is connected with the input high-voltage end, the input negative end of the Nth full-bridge circuit is connected with the input low-voltage end, the output end of each full-bridge circuit is sequentially connected with the input end of the transformer, and the transformer reduces the alternating-current high voltage to the alternating-current low voltage; the output end of the transformer is connected with a rear-stage rectification filter circuit, and the rear-stage rectification filter circuit converts the alternating-current low voltage into direct-current low voltage; the drive control circuit provides drive for the N-path full-bridge circuit and stabilizes the direct current low voltage.

In a specific embodiment, the positive input terminal of the N full-bridge circuits receives a dc voltage of 11.2kV to 16.8kV, the negative input terminal of the N full-bridge circuit receives a voltage of 0, and the dc voltage received by the positive input terminal of the N full-bridge circuit is greater than the dc voltage received by the positive input terminal of the N +1 full-bridge circuit.

In one specific embodiment, the N-20.

In a specific embodiment, the dc high voltage is 14kV, the ac low voltage is 700V, and the dc low voltage is 700V.

In a specific embodiment, the circuit further comprises an auxiliary power supply for providing an operating voltage to the drive control circuit.

A second aspect of the present invention provides a method for voltage conversion using the circuit of the first aspect of the present invention, comprising:

the direct-current high voltage is inverted into required alternating-current high voltage through the N-path full bridge circuit;

the alternating-current high voltage is reduced to alternating-current low voltage through the transformer;

the alternating current low voltage is converted into direct current low voltage through the rear-stage rectification filter circuit;

the drive control circuit provides drive for the N-path full-bridge circuit and stabilizes the direct current low voltage.

The invention has the following beneficial effects:

the invention adopts the high-voltage DC-DC converter, fundamentally avoids adopting a power frequency transformer for high-voltage power supply, can greatly reduce the volume of the device and simultaneously reduces the heat productivity.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 shows a schematic diagram of a dc-to-dc low-voltage converter circuit according to an embodiment of the invention.

Detailed Description

In order to make the technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

A first embodiment of the present invention provides a dc-to-dc converter circuit, as shown in fig. 1, including: an N-path full bridge circuit, which takes 20 paths as an example in the figure, a transformer 21, a post-stage rectifying and filtering circuit 22 and a driving control circuit 23, wherein,

the N paths of full-bridge circuits are sequentially connected in series, and the direct-current high voltage is inverted into the required alternating-current high voltage; the input negative end of each full-bridge circuit is connected with the input positive end of the next full-bridge circuit in series, the input positive end of the first full-bridge circuit is connected with the input high-voltage end, the input negative end of the Nth full-bridge circuit is connected with the input low-voltage end, the output end of each full-bridge circuit is sequentially connected with the input end of the transformer, and the transformer reduces the alternating-current high voltage to the alternating-current low voltage; the output end of the transformer is connected with a rear-stage rectification filter circuit, and the rear-stage rectification filter circuit converts the alternating-current low voltage into direct-current low voltage; the drive control circuit provides drive for the N-path full-bridge circuit and stabilizes the direct current low voltage.

In a specific embodiment, the positive input terminal of the N full-bridge circuits receives a dc voltage of 11.2kV to 16.8kV, the negative input terminal of the N full-bridge circuit receives a voltage of 0, and the dc voltage received by the positive input terminal of the N full-bridge circuit is greater than the dc voltage received by the positive input terminal of the N +1 full-bridge circuit.

In one specific embodiment, the N-20.

In a specific embodiment, the dc high voltage is 14kV, the ac low voltage is 700V, and the dc low voltage is 700V.

In a particular embodiment, the circuit further comprises an auxiliary power supply 24 for providing an operating voltage to the drive control circuit.

A second embodiment of the present invention provides a method for performing voltage conversion using the circuit according to the first embodiment of the present invention, including:

the direct-current high voltage is inverted into required alternating-current high voltage through the N-path full bridge circuit;

the alternating-current high voltage is reduced to alternating-current low voltage through the transformer;

the alternating current low voltage is converted into direct current low voltage through the rear-stage rectification filter circuit;

the drive control circuit provides drive for the N-path full-bridge circuit and stabilizes the direct current low voltage.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.