WO2022188774A1

WO2022188774A1 - High-voltage output switching circuit

Info

Publication number: WO2022188774A1
Application number: PCT/CN2022/079723
Authority: WO
Inventors: 石浩; 郭进; 陈忠强
Original assignee: 西安特来电智能充电科技有限公司
Priority date: 2021-03-09
Filing date: 2022-03-08
Publication date: 2022-09-15
Also published as: CN215010075U; DE212022000154U1

Abstract

A high-voltage output switching circuit, comprising: N first output circuits, N≥2; and second output circuits respectively corresponding to the N first output circuits and connected in series to one another. Each first output circuit comprises M rectifying circuits connected in series, M≥2. Each second output circuit comprises capacitors respectively corresponding to the M rectifying circuits, and the capacitors are connected in series. Common ends of two adjacent rectifying circuits in the first output circuit are connected to common ends of two adjacent capacitors in the corresponding second output circuit. The first output circuits are connected by means of a first switching circuit, and the first output circuits and the second output circuits are connected by means of a second switching circuit. When the first switching circuit is turned on and the second switching circuit is turned off, the outputs of the first output circuits are connected in parallel. When the first switching circuit is turned off and the second switching circuit is turned on, the outputs of the first output circuits are connected in series. The high-voltage output switching circuit can realize wide-range constant-power output, and is simple to operate when being used.

Description

A high voltage output switching circuit

This application claims the priority of the Chinese patent application with the application number 202120503809.1 and the invention titled "A High Voltage Output Switching Circuit", which was submitted to the China Patent Office on March 09, 2021, the entire contents of which are incorporated into this application by reference .

technical field

The present application relates to the technical field of power electronics, and in particular, to a high-voltage output switching circuit.

Background technique

With the continuous development of new energy technology, the demand for DC output power of charging piles is increasing. Limited by the current of the gun wire, the output high voltage has gradually become a new demand in the industry. Especially in the special field, the demand voltage has exceeded 1000V, and it may exceed 1500V in the future, or even higher. Although there are some circuit schemes for realizing high voltage output at present, they have limitations. When the demand exceeds 1000V, the existing circuit schemes are difficult to operate. In view of this, how to solve the above-mentioned technical defects has become an urgent technical problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

The purpose of the present application is to provide a high-voltage output switching circuit, which can realize a wide range of constant power output, and the circuit is easy to use and operate.

In order to solve the above technical problems, the present application provides a high-voltage output switching circuit, including:

N channels of first output circuits, N≥2; second output circuits respectively corresponding to the N channels of the first output circuits; a first switch circuit and a second switch circuit; each of the second output circuits is connected in parallel with the corresponding an output end of the first output circuit, and each of the second output circuits is connected in series;

The first output circuit includes M channels of rectifier circuits connected in series with each other, M≥2; the second output circuit includes capacitors corresponding to the M channels of the rectifier circuits, and each of the capacitors is connected in series with each other; the first output circuit includes capacitors. The common terminals of two adjacent rectifier circuits in the output circuit are connected to the common terminals of two adjacent capacitors in the corresponding second output circuit;

The first output circuits are connected through the first switch circuit, and the first output circuit and the second output circuit are connected through the second switch circuit;

When the first switch circuit is turned on and the second switch circuit is turned off, the outputs of the first output circuits are connected in parallel; when the first switch circuit is turned off and the second switch circuit is turned on , the outputs of each of the first output circuits are connected in series.

Optionally, the positive output terminal of the first output circuit of the first channel is connected to the positive output terminal of the first output circuit of one of the remaining first output circuits after at least one of the first switch circuits is connected in series. ;

The negative output terminal of the Nth first output circuit is connected to at least one of the first switch circuits in series with the negative output terminals of one of the remaining first output circuits, and N≥3 .

Optionally, the negative output terminal of the first output circuit of the first circuit is connected in series with the second switch circuit and then connected to the common terminal of the corresponding second output circuit and the adjacent second output circuit;

The positive output terminal of the Nth first output circuit is connected in series with one of the second switch circuits, and then connected to the corresponding second output circuit and the common terminal of the adjacent second output circuit, N≥3;

The positive output terminal and the negative output terminal of the remaining first output circuits are respectively connected in series with one of the second switch circuits and then connected to the corresponding second output circuit and the common terminal of the adjacent second output circuit.

Optionally, diodes are connected in parallel with two ends of the capacitor connected to the adjacent second output circuit in the second output circuit.

Optionally, also include:

a third switch circuit; the third switch circuit is connected in parallel at least to the common terminal of two adjacent capacitors in two adjacent second output circuits.

Optionally, each of the rectifier circuits in the first output circuit is connected to different secondary sides of the same transformer.

Optionally, each of the rectifier circuits in the first output circuit is connected to the secondary sides of different transformers.

Optionally, the first switch circuit includes any one or any combination of a diode, a MOS transistor, an IGBT, and a relay.

Optionally, the second switch circuit includes any one or any combination of MOS transistors, IGBTs, and relays.

Optionally, the third switch circuit includes any one or any combination of MOS transistors, IGBTs, and relays.

The high-voltage output switching circuit provided by the present application includes: N channels of first output circuits, N≥2; second output circuits corresponding to the N channels of the first output circuits respectively; a first switch circuit and a second switch circuit; Each of the second output circuits is connected in parallel with the output end of the corresponding first output circuit, and each of the second output circuits is connected in series;

It can be seen that, in the high-voltage output switching circuit provided by the present application, the first output circuit is provided with two or more rectifier circuits connected in series with each other, so that a single first output circuit can output a larger voltage. The first output circuits are connected through a first switch circuit, the first output circuit and the second output circuit are connected through a second switch circuit, and each first output circuit can be controlled by controlling the first switch circuit and the second switch circuit The outputs are connected in parallel or in series, which can realize a wide range of constant power output, and the circuit is easy to use and operate.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the prior art and the drawings required in the embodiments. Obviously, the drawings in the following description are only some of the drawings in the present application. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic diagram of a first high-voltage output switching circuit provided by an embodiment of the application;

2 is a schematic diagram of a first first output circuit and a second output circuit according to an embodiment of the present application;

3 is a schematic diagram of a second type of first output circuit and a second output circuit provided by an embodiment of the present application;

4 is a schematic diagram of a second high-voltage output switching circuit provided by an embodiment of the present application;

5 is a schematic diagram of a third high-voltage output switching circuit provided by an embodiment of the present application;

6 is a schematic diagram of a fourth high-voltage output switching circuit provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of a fifth high-voltage output switching circuit provided by an embodiment of the present application.

Detailed ways

The core of the present application is to provide a high-voltage output switching circuit, which can realize a wide range of constant power output, and the circuit is easy to use and operate.

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of a high-voltage output switching circuit provided by an embodiment of the present application. Referring to FIG. 1, the high-voltage output switching circuit includes:

N channels of first output circuits 10, N≥2; second output circuits 20 corresponding to N channels of first output circuits 10 respectively; first switch circuits 30 and second switch circuits 40; each second output circuit 20 is connected in parallel to the corresponding The output terminals of the first output circuit 10 are connected in series, and the second output circuits 20 are connected in series; the first output circuit 10 includes M channels of rectifier circuits connected in series with each other, M≥2; the second output circuit 20 includes M channels of rectifier circuits corresponding to each other. capacitor C, and each capacitor C is connected in series with each other; the common terminal of two adjacent rectifier circuits in the first output circuit 10 is connected to the common terminal of two adjacent capacitors C in the corresponding second output circuit 20; the first output circuit 10 are connected through the first switch circuit 30, and the first output circuit 10 and the second output circuit 20 are connected through the second switch circuit 40; when the first switch circuit 30 is turned on and the second switch circuit 40 is turned off, each The outputs of the first output circuits 10 are connected in parallel; when the first switch circuit 30 is turned off and the second switch circuit 40 is turned on, the outputs of the first output circuits 10 are connected in series.

Specifically, each channel of the first output circuit 10 includes M channels of rectifier circuits connected in series, and each channel of the second output circuit 20 includes M capacitors C connected in series with each other, where M≧2. The common terminals of two adjacent rectifier circuits in the first output circuit 10 are connected to the common terminals of two adjacent capacitors C in the corresponding second output circuit 20.

Referring to FIG. 2 , taking the first output circuit 10 including two rectifier circuits connected in series as an example, the second output circuit 20 corresponding to the first output circuit 10 includes two capacitors C. As shown in FIG. The rectifier circuit 1 corresponds to the capacitor C1, and the rectifier circuit 2 corresponds to the capacitor C2. The common terminal of the rectifier circuit 1 and the rectifier circuit 2 is connected to the common terminal of the capacitor C1 and the capacitor C2.

Referring to FIG. 3 , taking the first output circuit 10 including three rectifier circuits connected in series as an example, the second output circuit 20 corresponding to the first output circuit 10 includes three capacitors C. The rectifier circuit 1 corresponds to the capacitor C1, the rectifier circuit 2 corresponds to the capacitor C2, and the rectifier circuit 3 corresponds to the capacitor C3. The common terminal of the rectifier circuit 1 and the rectifier circuit 2 is connected to the common terminal of the capacitor C1 and the capacitor C2, and the common terminal of the rectifier circuit 2 and the rectifier circuit 3 is connected to the common terminal of the capacitor C2 and the capacitor C3.

By analogy, the number of rectifier circuits in the first output circuit 10 is greater than three.

The first output circuit 10 is provided with two or more rectifier circuits connected in series with each other, so that one channel of the first output circuit 10 can output a larger voltage.

The connection between the first output circuits 10 is as follows: the first output circuits 10 are connected through the first switch circuit 30 . The connection between the first output circuit 10 and the second output circuit 20 is as follows: the first output circuit 10 and the second output circuit 20 are connected through the second switch circuit 40; in this way, when all the first switch circuits 30 are turned on , when all the second switch circuits 40 are disconnected, the first output circuits 10 are connected in series; when all the first switch circuits 30 are disconnected and all the second switch circuits 40 are turned on, the first output circuits 10 are connected in parallel .

In a specific implementation manner, the connection between the first output circuits 10 may be:

The positive output terminal of the first first output circuit 10 is connected to the positive output terminal of the first output circuit 10 of the remaining first output circuits 10 after at least one first switching circuit 30 is connected in series; the Nth first output circuit The negative output terminal of 10 is connected to the negative output terminal of one of the remaining first output circuits 10 after at least one first switch circuit 30 is connected in series, and N≥3.

The first switch circuit 30 includes any one or any combination of diodes, MOS transistors, IGBTs, and relays.

In a specific implementation manner, the connection between the first output circuit 10 and the second output circuit 20 is as follows:

The negative output terminal of the first output circuit 10 is connected in series with a second switch circuit 40 and then connected to the corresponding second output circuit 20 and the common terminal of the adjacent second output circuit 20; The positive output terminal is connected in series with a second switch circuit 40 and then connected to the corresponding second output circuit 20 and the common terminal of the adjacent second output circuit 20, N≥3; the positive output terminal and the negative output of the remaining first output circuit 10 The terminals are respectively connected in series with a second switch circuit 40 and then connected to the corresponding second output circuit 20 and the common terminal of the adjacent second output circuit 20 .

Wherein, the second switch circuit 40 includes any one or any combination of MOS transistors, IGBTs, and relays.

Referring to FIG. 4 , take three first output circuits 10 as an example, where each first output circuit 10 includes two rectifier circuits connected in series:

After the positive output terminal of the first channel of the first output circuit 10 is connected in series with a channel of the first switch circuit S1 , it is connected to the positive output terminal of the second channel of the first output circuit 10 . After the positive output terminal of the first first output circuit 10 is connected in series with a first switching circuit S2, it is connected to the positive output terminal of the third first output circuit 10 (in this case, the Nth first output circuit 10). After the negative output terminal of the first output circuit 10 is connected in series with the first switching circuit S3, the negative output terminal of the second output circuit 10 is connected. After the negative output terminal of the first output circuit 10 is connected in series with the first switch circuit S4, it is connected to the negative output terminal of the first output circuit 10 of the third channel.

After the negative output terminal of the first channel of the first output circuit 10 is connected in series with a channel of the second switch circuit S1A, the common terminal of the capacitor C2 and the capacitor C3 is connected. After the positive output terminal of the second first output circuit 10 is connected in series with a second switching circuit S2A, the common terminal of the capacitor C2 and the capacitor C3 is connected. After the second switch circuit S2B is connected in series with the negative output terminal of the second first output circuit 10, the common terminal of the capacitor C4 and the capacitor C5 is connected. After the positive output terminal of the third channel of the first output circuit 10 is connected in series with a channel of the second switch circuit S3A, it is connected to the common terminal of the capacitor C4 and the capacitor C5.

When the first switch circuits S1, S2, and S3 are turned on, and the second switch circuits S1A, S2A, S2B, and S3A are turned off, the output of the first output circuit 10, the second output circuit 10, and the The outputs of the three first output circuits 10 are connected in parallel. The output of the first output circuit 10 and the capacitor C1 to the capacitor C6 form a loop. The output of the first output circuit 10 of the second channel and the capacitor C1 to the capacitor C4 form a loop. The output of the first output circuit 10 of the third channel and the capacitor C1 to the capacitor C4 form a loop. The total output current is equal to the sum of the currents output by the first output circuit 10 of the first channel, the first output circuit 10 of the second channel and the current output of the first output circuit 10 of the third channel.

When the first switch circuits S1, S2, and S3 are turned off, and the second switch circuits S1A, S2A, S2B, and S3A are turned on, the outputs of the first output circuit 10, the second output circuit 10, and the first output circuit 10 are turned on. The outputs of the three first output circuits 10 are connected in series. The output of the first output circuit 10 of the first channel, the capacitor C1 and the capacitor C2 form a loop. The output of the first output circuit 10 of the second channel, the capacitor C3 and the capacitor C4 form a loop. The output of the first output circuit 10 of the third channel, the capacitor C5 and the capacitor C6 form a loop. The total output voltage is equal to the sum of the voltages output by the first output circuit 10 of the first channel, the first output circuit 10 of the second channel and the output voltage of the first output circuit 10 of the third channel.

The above embodiment is directed to the case of N≥3. For the case of N=2, please refer to FIG. 5 . Take two first output circuits 10 , each of which includes two rectifier circuits connected in series with each other as an example. :

After the positive output terminal of the first output circuit 10 is connected in series with the first switching circuit S1, it is connected to the positive output terminal of the second first output circuit 10 (in this case, the N-th first output circuit 10). After the negative output terminal of the first output circuit 10 of the second channel is connected in series with the first switching circuit S2, the negative output terminal of the first output circuit 10 of the first channel is connected. After the negative output terminal of the first channel of the first output circuit 10 is connected in series with a channel of the second switch circuit S1A, the common terminal of the capacitor C2 and the capacitor C3 is connected. After the positive output terminal of the second first output circuit 10 is connected in series with a second switching circuit S2A, the common terminal of the capacitor C2 and the capacitor C3 is connected.

When the first switch circuits S1 and S2 are turned on and the second switch circuits S1A and S2A are disconnected, the output of the first first output circuit 10 is connected in parallel with the output of the second first output circuit 10 . The output of the first output circuit 10, the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 form a loop. The output of the first output circuit 10 of the second channel, the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 form a loop. The total output current is equal to the sum of the currents output by the first output circuit 10 of the first channel and the current output by the first output circuit 10 of the second channel, which meets the requirements of low voltage and high current.

When the first switch circuits S1 and S2 are disconnected and the second switch circuits S1A and S2A are turned on, the output of the first first output circuit 10 is connected in series with the output of the second first output circuit 10 . The output of the first output circuit 10 of the first channel, the capacitor C1 and the capacitor C2 form a loop. The output of the first output circuit 10 of the second channel, the capacitor C3 and the capacitor C4 form a loop. The total output voltage is equal to the sum of the voltages output by the first output circuit 10 of the first channel and the voltage output by the first output circuit 10 of the second channel, which meets the high-voltage output requirement.

Further, on the basis of the above embodiment, as a preferred implementation, diodes are connected in parallel with both ends of the capacitor connected to the adjacent second output circuit 20 in the second output circuit 20, so as to prevent the second output circuit The capacitor connected to the adjacent second output circuit 20 in 20 is damaged by back pressure.

For example, as shown in FIG. 6 , two ends of the capacitor C2 are connected in parallel with a diode D1 , and two ends of the capacitor C3 are connected in parallel with a diode D2 . The anode of the diode D1 is connected to the common terminal of the capacitor C2 and the capacitor C3; the cathode of the diode D2 is connected to the common terminal of the capacitor C2 and the capacitor C3.

Further, on the basis of the above embodiment, as a preferred implementation, it also includes:

The third switch circuit; the third switch circuit is connected in parallel with at least the common terminals of the two adjacent capacitors in the two adjacent second output circuits 20, so that when the third switch circuit is turned on, the The turned-on third switch circuit short-circuits the capacitor connected in parallel, thereby increasing the capacitance value of the output capacitor. Wherein, the third switch circuit includes any one or any combination of MOS transistors, IGBTs, and relays.

For example, as shown in FIG. 7 , the capacitor C2 and the capacitor C3 are connected in series with the third switch circuit K in parallel. When the third switch circuit K is turned on, the capacitor C2 and the capacitor C3 are short-circuited.

Further, in a specific implementation manner, each of the rectifier circuits in the first output circuit 10 is connected to different secondary sides of the same transformer.

For example, referring to FIG. 6 , the rectifier circuit composed of diodes D1 to D4 in the first output circuit 10 is connected to the secondary side 1 of the transformer T1; the first output circuit 10 of the first output circuit 10 is composed of diodes D5 to D8. The rectifier circuit is connected to the secondary side 2 of the transformer T1. The rectifier circuit composed of diodes D9 to D12 in the second channel of the first output circuit 10 is connected to the secondary side 1 of the transformer T2; the rectifier circuit composed of diodes D13 to D16 in the second channel of the first output circuit 10 is connected to the secondary side of the transformer T2 2.

Further, in a specific implementation manner, each of the rectifier circuits in the first output circuit 10 is connected to the secondary sides of different transformers.

For example, as shown in FIG. 7 , the rectifier circuit composed of diodes D1 to D4 in the first output circuit 10 is connected to the secondary side of the transformer T1; the rectifier circuit composed of diodes D5 to D8 in the first output circuit 10 of the first path The circuit is connected to the secondary side of the transformer T2. The rectifier circuit composed of diodes D9 to D12 in the second first output circuit 10 is connected to the secondary side of the transformer T3; the rectifier circuit composed of diodes D13 to D16 in the second first output circuit 10 is connected to the secondary side of the transformer T4.

To sum up, in the high-voltage output switching circuit provided by the present application, the first output circuit is provided with two or more rectifier circuits connected in series with each other, whereby a single first output circuit can output a larger voltage. The first output circuits are connected through a first switch circuit, the first output circuit and the second output circuit are connected through a second switch circuit, and each first output circuit can be controlled by controlling the first switch circuit and the second switch circuit The outputs are connected in parallel or in series, which can realize a wide range of constant power output, and the circuit is easy to use and operate.

Due to the complexity of the situation, it is impossible to enumerate and describe them one by one. Those skilled in the art should be aware that there may be multiple examples based on the basic principles of the embodiments provided in this application and combined with the actual situation. are within the scope of this application.

The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

The high-voltage output switching circuit provided by the present application has been described in detail above. Specific examples are used herein to illustrate the principles and implementations of the present application, and the descriptions of the above embodiments are only used to help understand the methods and core ideas of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present application, several improvements and modifications can also be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities or operations. There is no such actual relationship or sequence between operations. Furthermore, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or device that includes the element.

Claims

A high-voltage output switching circuit, characterized in that it includes:

N channels of first output circuits, N≥2; second output circuits respectively corresponding to the N channels of the first output circuits; a first switch circuit and a second switch circuit; each of the second output circuits is connected in parallel with the corresponding an output end of the first output circuit, and each of the second output circuits is connected in series;

The first output circuit includes M channels of rectifier circuits connected in series with each other, M≥2; the second output circuit includes capacitors corresponding to the M channels of the rectifier circuits, and each of the capacitors is connected in series with each other; the first output circuit includes capacitors. The common terminals of two adjacent rectifier circuits in the output circuit are connected to the common terminals of two adjacent capacitors in the corresponding second output circuit;

The first output circuits are connected through the first switch circuit, and the first output circuit and the second output circuit are connected through the second switch circuit;

When the first switch circuit is turned on and the second switch circuit is turned off, the outputs of the first output circuits are connected in parallel; when the first switch circuit is turned off and the second switch circuit is turned on , the outputs of each of the first output circuits are connected in series.
The high-voltage output switching circuit according to claim 1, wherein the positive output terminal of the first output circuit is connected in series with at least one of the first switching circuits and the remaining first output circuits. the positive output terminals of the first output circuit are connected together;

The negative output terminal of the Nth first output circuit is connected to at least one of the first switch circuits in series with the negative output terminals of one of the remaining first output circuits, and N≥3 .
The high-voltage output switching circuit according to claim 1, wherein the negative output terminal of the first output circuit of the first circuit is connected in series with the second switching circuit and then connected to the corresponding second output circuit and the adjacent output circuit. The common terminal of the second output circuit;

The positive output terminal of the Nth first output circuit is connected in series with one of the second switch circuits, and then connected to the corresponding second output circuit and the common terminal of the adjacent second output circuit, N≥3;

The positive output terminal and the negative output terminal of the remaining first output circuits are respectively connected in series with one of the second switch circuits and then connected to the corresponding second output circuit and the common terminal of the adjacent second output circuit.
The high-voltage output switching circuit according to claim 1, wherein diodes are connected in parallel with two ends of the capacitor connected to the adjacent second output circuit in the second output circuit.
The high-voltage output switching circuit according to claim 1, further comprising:

a third switch circuit; the third switch circuit is connected in parallel at least to the common terminal of two adjacent capacitors in two adjacent second output circuits.
The high-voltage output switching circuit according to claim 1, wherein each of the rectifier circuits in the first output circuit is connected to different secondary sides of the same transformer.
The high-voltage output switching circuit according to claim 1, wherein each of the rectifier circuits in the first output circuit is connected to the secondary sides of different transformers.
The high-voltage output switching circuit according to claim 1, wherein the first switching circuit comprises any one or any combination of diodes, MOS transistors, IGBTs, and relays.
The high-voltage output switching circuit according to claim 1, wherein the second switching circuit comprises any one or any combination of a MOS transistor, an IGBT, and a relay.
The high-voltage output switching circuit according to claim 5, wherein the third switching circuit comprises any one or any combination of a MOS transistor, an IGBT, and a relay.