CN218124363U - A charging and discharging circuit, an energy router, and an electrical device - Google Patents

Abstract

The utility model discloses a charge-discharge circuit, energy router and consumer. Wherein, this circuit is applied to the energy router, includes: and a first end of the charge-discharge module is connected with the anode of a high-voltage side direct-current bus of the energy router, a second end of the charge-discharge module is connected with the anode of a high-voltage side bus capacitor of the energy router, a third end of the charge-discharge module is connected with the anode of a low-voltage side direct-current bus capacitor of the energy router, a fourth end of the charge-discharge module is connected with the anode of a low-voltage side bus capacitor of the energy router, and a fifth end of the charge-discharge module is connected with the cathode of the low-voltage side bus capacitor. Through the utility model discloses, can realize only realizing above-mentioned four kinds of functions through a charge-discharge module, reduce components and parts, the cost is reduced has dwindled occupation space simultaneously.

Description

A charging and discharging circuit, an energy router, and an electrical device

technical field

The utility model relates to the technical field of electronic power, in particular to a charging and discharging circuit, an energy router and electrical equipment.

Background technique

According to the characteristics of the capacitor, a sudden increase in the voltage across the capacitor will cause damage to the capacitor. In order to prevent the bus capacitor from being damaged due to a sudden increase in voltage, it is necessary to charge the bus capacitor before starting. In the energy router with bidirectional conversion, there are two ways to start, that is, high-voltage side start-up and low-voltage side start-up, so two kinds of start-up methods must design a charging circuit to pre-charge the bus capacitor. The charging circuit is used for high side starting. After the electrical equipment is shut down, the bus capacitor needs to be discharged to avoid dangers such as electric shock. Generally, discharge resistors are connected in parallel to the bus capacitors on the high-voltage side and the low-voltage side to discharge. It can be seen that the energy router needs to use two discharge resistors and two charge resistors, a total of four resistors, the cost of the device is relatively high, and it takes up a lot of space.

Aiming at the problem that the energy router with bidirectional conversion in the prior art needs to set at least four resistors to charge and discharge the bus capacitors on the high-voltage side and the low-voltage side, resulting in high cost and large space occupation, no effective solution has been proposed yet.

Utility model content

The embodiment of the utility model provides a charging and discharging circuit, an energy router and electrical equipment to solve the problem that the energy router with bidirectional conversion in the prior art needs to set at least four resistors to charge and discharge the bus capacitors on the high-voltage side and the low-voltage side , leading to the problems of high cost and large space occupation.

In order to solve the above technical problems, the utility model provides a charging and discharging circuit, which is applied to an energy router, and the circuit includes:

The charging and discharging module, its first end is connected to the positive pole of the high-voltage side DC bus of the energy router, its second end is connected to the positive pole of the high-voltage side bus capacitor of the energy router, and its third end is connected to the low-voltage side of the energy router The positive pole of the DC bus, the fourth end of which is connected to the positive pole of the low-voltage side bus capacitor of the energy router, and the fifth end of which is connected to the negative pole of the low-voltage side bus capacitor.

Further, the charging and discharging module includes:

A charging and discharging resistor, the first end of which is connected to the positive pole of the high-voltage side DC bus through the first switch; the first end is also connected to the positive pole of the high-voltage side bus capacitor through the second switch; the first end is also connected to the positive pole of the high-voltage side bus capacitor through the third switch Connect the positive pole of the low-voltage side DC bus; its first end is also connected to the positive pole of the low-voltage side bus capacitor through the fourth switch;

Its second end is connected to the positive pole of the low-voltage side bus capacitor through the fifth switch; its second end is also connected to the negative pole of the low-voltage side bus capacitor through the sixth switch.

Further, the charging and discharging circuit also includes:

The seventh switch is arranged between the first connection point and the second connection point, wherein the first connection point is formed by connecting the first terminal of the charging and discharging module to the positive pole of the high-voltage side DC bus bar, so The second connection point is formed by connecting the second end of the charging and discharging module to the positive pole of the high voltage side bus capacitor.

Further, the charging and discharging circuit also includes:

The eighth switch is arranged between the third connection point and the fourth connection point, the third connection point is formed by connecting the third terminal of the charging and discharging module with the positive pole of the low-voltage side DC bus bar, and the first The four connection points are formed by connecting the fourth end of the charging and discharging module to the positive pole of the low-voltage side bus capacitor.

The utility model also provides an energy router, which includes a high-voltage side and a low-voltage side, and also includes the above charging and discharging circuit.

The utility model also provides an electrical device, including the above-mentioned energy router.

Applying the technical scheme of the utility model, by switching the conduction state of the charging and discharging module, the high-voltage side start-up, the low-voltage side start-up, the high-voltage side bus capacitor discharge and the low-voltage side bus capacitor discharge can be realized, and the above four functions can be realized through only one charging and discharging module. This function reduces the components, reduces the cost, and reduces the occupied space at the same time.

Description of drawings

FIG. 1 is a structural diagram of a charging and discharging circuit of an energy router in the prior art;

FIG. 2 is a structural diagram of a charging and discharging circuit according to an embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the utility model, rather than all implementations example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise, "multiple "Generally contains at least two.

It should be understood that the term "and/or" used herein is only an association relationship describing associated objects, which means that there may be three relationships, for example, A and/or B, which may mean that A exists alone, and A and B exist simultaneously. B, there are three situations of B alone. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

It should be understood that although the terms first, second, third, etc. may be used to describe switches in the embodiments of the present invention, these switches should not be limited to these terms. These terms are only used to distinguish the various switches. For example, without departing from the scope of the embodiments of the present invention, a first switch may also be called a second switch, and similarly, a second switch may also be called a first switch.

Depending on the context, the words "if", "if" as used herein may be interpreted as "at" or "when" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrases "if determined" or "if detected (the stated condition or event)" could be interpreted as "when determined" or "in response to the determination" or "when detected (the stated condition or event) )" or "in response to detection of (a stated condition or event)".

It should also be noted that the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that an article or arrangement comprising a list of elements includes not only those elements but also includes items not expressly listed. other elements of the product, or elements inherent in the product or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in an article or device comprising said element.

Optional embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.

Example 1

In order to prevent the voltage surge from causing damage to the bus capacitor, it is necessary to charge the bus capacitor before starting. In the energy router with bidirectional conversion, there are two ways to start, that is, high-voltage side start-up and low-voltage side start-up, so two kinds of start-up methods must design a charging circuit to pre-charge the bus capacitor. The charging circuit is used for high side starting. After the electrical equipment is shut down, the bus capacitor needs to be discharged to avoid dangers such as electric shock. Generally, discharge resistors are connected in parallel to the bus capacitors on the high-voltage side and the low-voltage side to discharge. Figure 1 is a structural diagram of the charging and discharging circuit of the energy router in the prior art. A resistor, the cost of the device is high, and it takes up a lot of space.

In view of the above problems, this embodiment provides a charging and discharging circuit, which is applied to an energy router. In this embodiment, the energy router is a three-phase interleaved and parallel connected energy router. FIG. 2 is a charging and discharging circuit according to an embodiment of the present invention The structure diagram, as shown in Figure 2, the circuit includes:

The charging and discharging module 10, its first end is connected to the positive pole VH+ of the high-voltage side DC bus of the energy router, its second end is connected to the positive pole of the high-voltage side bus capacitor C1 of the energy router, and its third end is connected to the low-voltage side of the energy router. The positive pole VL+, its fourth terminal is connected to the positive pole of the low-voltage side bus capacitor C2 of the energy router, and its fifth terminal is connected to the negative pole of the low-voltage side bus capacitor C2. The conduction state of the charging and discharging module 10 can be switched according to the operation to be performed by the energy router.

The charging and discharging circuit of this embodiment, by switching the conduction state of the charging and discharging module 10, realizes high-voltage side startup, low-voltage side startup, high-voltage side bus capacitor discharge, and low-voltage side bus capacitor discharge, and only one charging and discharging module 10 realizes the above four This function reduces the components, reduces the cost, and reduces the occupied space at the same time.

In order to realize switching of different operations, as shown in FIG. 2 , the above charging and discharging module 10 includes:

The charging and discharging resistor R has its first end connected to the positive pole VH+ of the high-voltage side DC bus through the first switch S1; its first end is also connected to the positive pole of the high-voltage side bus capacitor C1 through the second switch S2; its first end is also connected through the third The switch S3 is connected to the positive pole VL+ of the DC bus on the low-voltage side; its first end is also connected to the positive pole of the bus capacitor C2 on the low-voltage side through the fourth switch S4; the second end of the charging and discharging resistor R is connected to the bus capacitor C2 on the low-voltage side through the fifth switch S5 positive pole; the second terminal of the charging and discharging resistor R is also connected to the negative pole of the low-voltage side bus capacitor C2 through the sixth switch S6.

In order to control the electrical equipment to enter the normal operation state after the charging of the bus capacitor C1 on the high-voltage side is completed, the charging and discharging circuit also includes:

The seventh switch QF1 is set between the first connection point and the second connection point, wherein the first connection point is formed by connecting the first end of the charging and discharging module 10 with the positive pole VH+ of the high-voltage side DC bus bar, and the second connection point It is formed by connecting the second end of the charge-discharge module 10 to the positive pole of the high-voltage side bus capacitor C1.

In order to control the electrical equipment to enter the normal operation state after the charging of the bus capacitor C2 on the low-voltage side is completed, the charging and discharging circuit also includes: an eighth switch QF2, which is set between the third connection point and the fourth connection point, and the third connection point The third terminal of the charge-discharge module 10 is connected to the positive pole VL+ of the low-voltage side DC bus, and the fourth connection point is formed by the fourth terminal of the charge-discharge module 10 connected to the positive pole of the low-voltage side bus capacitor C2.

In summary, the seventh switch QF1 is the main circuit breaker on the high-voltage side, C1 is the bus capacitor on the high-voltage side, the eighth switch QF2 is the main circuit breaker on the low-voltage side, C2 is the bus capacitor on the low-voltage side, and VT1-6 is the IGBT switch tube. L1, L2, and L3 are energy storage inductors. The charging and discharging module 10 is composed of switches S1 , S2 , S3 , S4 , S5 , S6 and a charging and discharging resistor R. Terminal 1 of the first switch S1 in the charging and discharging module 10 is connected to terminal 1 of the seventh switch QF1 , and terminal 2 of S1 is connected to terminal 1 of the charging and discharging resistor R. Terminal 1 of S2 is connected to terminal 2 of the seventh switch QF1 , and terminal 2 of the second switch S2 is connected to terminal 1 of the charging and discharging resistor R. Terminal 1 of the third switch S3 is connected to terminal 1 of the charging and discharging resistor R, and terminal 2 of the third switch S3 is connected to terminal 2 of the eighth switch QF2. Terminal 1 of the fourth switch S4 is connected to terminal 1 of the charging and discharging resistor R, and terminal 2 of S4 is connected to terminal 1 of the eighth switch QF2. Terminal 1 of S5 is connected to terminal 2 of the charging and discharging resistor R, and terminal 2 of the fifth switch S5 is connected to terminal 1 of the eighth switch QF2. Terminal 1 of the sixth switch S6 is connected to terminal 2 of the charging and discharging resistor R, and terminal 2 of the sixth switch S6 is connected to the negative pole of the high and low voltage side DC bus.

Example 2

This embodiment provides an energy router, which includes a high-voltage side and a low-voltage side, and also includes the above-mentioned charging and discharging circuit, which is used to realize high-voltage side startup, low-voltage side startup, high-voltage side bus capacitor discharge, and low-voltage side bus capacitor discharge through a charging and discharging module. The above four operations reduce the number of components, lower the cost, and reduce the occupied space at the same time.

Example 3

This embodiment provides an electrical device, including the above-mentioned energy router, and the energy router includes the above-mentioned charging and discharging circuit, which is used to realize high-voltage side start-up, low-voltage side start-up, high-voltage side bus capacitor discharge, and low-voltage side bus capacitor discharge through a charge-discharge module The above four operations reduce the number of components, lower the cost, and reduce the occupied space at the same time.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit of the technical solutions of the various embodiments of the present invention. and range.

Claims (6)

1. A charging and discharging circuit is applied to an energy router, and is characterized by comprising:

and a first end of the charge-discharge module is connected with the anode of the high-voltage side direct-current bus of the energy router, a second end of the charge-discharge module is connected with the anode of the high-voltage side bus capacitor of the energy router, a third end of the charge-discharge module is connected with the anode of the low-voltage side direct-current bus of the energy router, a fourth end of the charge-discharge module is connected with the anode of the low-voltage side bus capacitor of the energy router, and a fifth end of the charge-discharge module is connected with the cathode of the low-voltage side bus capacitor.

2. The circuit of claim 1, wherein the charge-discharge module comprises:

a first end of the charge-discharge resistor is connected with the anode of the high-voltage side direct current bus through a first switch; the first end of the high-voltage side bus capacitor is also connected with the anode of the high-voltage side bus capacitor through a second switch; the first end of the low-voltage side direct current bus is also connected with the anode of the low-voltage side direct current bus through a third switch; the first end of the low-voltage side bus capacitor is also connected with the anode of the low-voltage side bus capacitor through a fourth switch;

the second end of the low-voltage side bus capacitor is connected with the anode of the low-voltage side bus capacitor through a fifth switch; and the second end of the low-voltage side bus capacitor is also connected with the negative electrode of the low-voltage side bus capacitor through a sixth switch.

3. The circuit of claim 1, wherein the charge and discharge circuit further comprises:

the seventh switch is arranged between a first connection point and a second connection point, wherein the first connection point is formed by connecting a first end of the charge-discharge module with the positive electrode of the high-voltage side direct current bus, and the second connection point is formed by connecting a second end of the charge-discharge module with the positive electrode of the high-voltage side bus capacitor.

4. The circuit of claim 1, wherein the charging and discharging circuit further comprises:

the eighth switch is arranged between a third connection point and a fourth connection point, the third connection point is formed by connecting a third end of the charge-discharge module with the positive electrode of the low-voltage side direct-current bus, and the fourth connection point is formed by connecting a fourth end of the charge-discharge module with the positive electrode of the low-voltage side bus capacitor.

5. An energy router comprising a high voltage side and a low voltage side, further comprising the charging and discharging circuit of any one of claims 1 to 4.

6. An electric device comprising the energy router of claim 5.

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