阅读说明：本技术 Dc-dc变换电路、储能柜及其热接入控制方法 (DC-DC conversion circuit, energy storage cabinet and heat access control method thereof ) 是由 党培育 姜颖异 郭泳颖 黄颂儒 陈宁宁 于 2020-04-26 设计创作，主要内容包括：本发明公开一种DC-DC变换电路、储能柜及其热接入控制方法。其中,该DC-DC变换电路,设置于蓄电池和直流母线之间,包括依次设置在直流母线正极端子和蓄电池正极端子之间的第二开关、第一开关管、电感、电阻、设置在所述电阻与所述直流母线正极端子之间的第一开关、与所述第一开关管串联的第二开关管以及并联设置在第一开关管和所述第二开关管两端的电容,其特征在于,所述电路还包括：第三开关管,所述第三开关管与所述第一开关管同向并联,用于在所述第一开关管发生故障时导通。通过本发明,能够实现在DC-DC变换电路的元件损坏时,保证整个系统正常运行。(The invention discloses a DC-DC conversion circuit, an energy storage cabinet and a heat access control method thereof. The DC-DC conversion circuit is arranged between a storage battery and a DC bus, and includes a second switch, a first switch tube, an inductor, a resistor, a first switch arranged between the resistor and the DC bus positive terminal, a second switch tube connected in series with the first switch tube, and a capacitor connected in parallel at two ends of the first switch tube and the second switch tube, wherein the second switch, the first switch tube, the inductor, the resistor, the first switch arranged between the resistor and the DC bus positive terminal, and the capacitor connected in parallel at two ends of the first switch tube and the second switch tube are sequentially arranged between the DC bus positive terminal and the storage battery positive terminal, and the DC-DC conversion circuit is characterized by further comprising: and the third switching tube is connected with the first switching tube in parallel in the same direction and is used for conducting when the first switching tube breaks down. By the method and the device, the normal operation of the whole system can be ensured when the elements of the DC-DC conversion circuit are damaged.)

1. A DC-DC conversion circuit is arranged between a storage battery and a direct current bus, and comprises a second switch, a first switch tube, an inductor, a resistor, a first switch arranged between the resistor and the positive terminal of the direct current bus, a second switch tube connected with the first switch tube in series, and a capacitor connected with the first switch tube and the second switch tube in parallel, wherein the second switch, the first switch tube, the inductor, the resistor, the first switch, the second switch and the capacitor are arranged between the positive terminal of the direct current bus and the positive terminal of the storage battery in sequence, and the circuit further comprises:

and the third switching tube is connected with the first switching tube in parallel in the same direction and is used for conducting when the first switching tube breaks down.

2. The circuit of claim 1, wherein the drain of the third switch tube is connected between the drain of the first switch tube and the positive terminal of the DC bus, and the source of the third switch tube is connected to the source of the first switch tube.

3. The circuit of claim 2, further comprising:

and the fourth switching tube is used for conducting when the second switching tube breaks down to replace the second switching tube, the drain electrode of the fourth switching tube is connected between the source electrode of the third switching tube and the source electrode of the first switching tube, and the source electrode of the fourth switching tube is connected between the source electrode of the second switching tube and the negative terminal of the direct-current bus.

4. The circuit of claim 3, further comprising:

and the fifth switching tube is used for being disconnected when the first switching tube and the second switching tube are not in fault, the source electrode of the fifth switching tube is connected between the source electrode of the first switching tube and the drain electrode of the second switching tube, and the drain electrode of the fourth switching tube is connected between the source electrodes of the third switching tube.

5. The circuit of claim 1, further comprising:

a third switch, a fourth switch, and a fifth switch, wherein the third switch is connected between the second end of the inductor and the battery positive terminal; the fourth switch is connected between the second end of the resistor and the positive terminal of the storage battery; the fifth switch is connected between the source electrode of the second switch tube and the negative electrode terminal of the storage battery.

6. An energy storage cabinet comprising: storage battery, controller and auxiliary power supply, characterized in that the energy storage cabinet further comprises a DC-DC conversion circuit according to any one of claims 1 to 5.

7. The energy storage cabinet of claim 6, wherein the controller is configured to collect a voltage of the dc bus, collect a voltage across the capacitor, and control the on/off of the first switch and the second switch according to the voltage of the dc bus and the voltage across the capacitor.

8. The energy storage cabinet of claim 7, wherein the controller is further configured to control the third switch, the fourth switch, and the fifth switch to be turned on and off.

9. The energy storage cabinet of claim 6, wherein the auxiliary power supply is configured to supply power to the controller after taking power from the DC bus.

10. A thermal access control method of an energy storage cabinet, which is applied to the energy storage cabinet of any one of claims 6 to 9, and is characterized by comprising the following steps:

judging whether the first switch tube has a fault;

if yes, the third switching tube is controlled to be conducted to replace the first switching tube.

11. The method of claim 10, wherein prior to determining whether the first switch tube is malfunctioning, the method further comprises:

after a direct-current bus positive terminal and a direct-current bus negative terminal of the energy storage cabinet are connected to a direct-current bus, controlling the first switch to be closed to enable the first switch tube to be conducted;

and collecting the voltage of the direct current bus and the voltage at the two ends of the capacitor, and controlling the on-off of the first switch and the second switch according to the voltage of the direct current bus and the voltage at the two ends of the capacitor.

12. The method of claim 11, wherein controlling the switching of the first switch and the second switch based on the dc bus voltage and the voltage across the capacitor comprises:

judging whether the ratio of the voltage at the two ends of the capacitor to the voltage of the direct current bus exceeds a preset value or not;

and if so, controlling the first switch to be opened and controlling the second switch to be closed.

13. The method of claim 12, wherein after controlling the second switch to close, the method further comprises:

judging whether the storage battery needs to be charged or discharged;

if the storage battery needs to be discharged, the fifth switch and the third switch are controlled to be closed;

if the storage battery needs to be charged, the fifth switch and the fourth switch are controlled to be switched on and off;

wherein the third switch is connected between the second end of the inductor and the battery positive terminal; the fourth switch is connected between the second end of the resistor and the positive terminal of the storage battery; the fifth switch is connected between the source electrode of the second switch tube and the negative electrode terminal of the storage battery.

14. The method of claim 12, wherein after controlling the second switch to close, the method further comprises:

judging whether the second switch tube has a fault;

if yes, the fourth switching tube is controlled to be conducted to replace the second switching tube.

15. The method of claim 10 or 14, wherein after controlling the second switch to close, the method further comprises:

if the first switching tube and the second switching tube are not in fault, controlling a fifth switching tube to be switched off;

if the first switching tube or the second switching tube has a fault, controlling a fifth switching tube to be conducted;

the source electrode of the fifth switching tube is connected between the source electrode of the first switching tube and the drain electrode of the second switching tube, and the drain electrode of the fourth switching tube is connected between the source electrodes of the third switching tube.

16. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 10 to 15.

Technical Field

The invention relates to the technical field of electronic circuits, in particular to a DC-DC conversion circuit, an energy storage cabinet and a heat access control method thereof.

Background

In a direct-current micro-grid system or an optical storage system, an energy storage cabinet is provided with an energy storage DC/DC converter. In the system, the energy storage cabinet needs a hot plug function when directly butting a high-voltage direct-current bus of the converter, an existing DC-DC conversion circuit is not provided with a redundant circuit design, the normal operation of the system cannot be maintained when electric appliance elements are damaged due to extreme voltage and current, if part of devices are damaged in operation, the whole system needs to be powered off, an emergency scheme is not provided, the devices can be seriously damaged due to long-time operation, and if part of electronic elements of the DC/DC circuit are damaged, the system can not operate due to system failure, so that the user experience and the overall operation efficiency of the system are influenced.

Aiming at the problem that the system can not normally operate when the elements of the DC-DC conversion circuit in the prior art are damaged, an effective solution is not provided at present.

Disclosure of Invention

The embodiment of the invention provides a DC-DC conversion circuit, an energy storage cabinet and a thermal access control method thereof, which aim to solve the problem that a system cannot normally operate when elements of the DC-DC conversion circuit are damaged in the prior art.

In order to solve the above technical problem, the present invention provides a DC-DC conversion circuit, which is disposed between a battery and a DC bus, wherein the circuit includes: set gradually second switch, first switch tube, inductance, resistance between positive terminal of direct current bus and the battery positive terminal, set up and be in resistance with first switch between the positive terminal of direct current bus, with the second switch tube and the parallelly connected setting of first switch tube in series of first switch tube with the electric capacity at second switch tube both ends, the circuit still includes:

and the third switching tube is connected with the first switching tube in parallel in the same direction and is used for conducting when the first switching tube breaks down.

Further, the drain electrode of the third switching tube is connected between the drain electrode of the first switching tube and the positive terminal of the direct current bus, and the source electrode of the third switching tube is connected with the source electrode of the first switching tube.

Further, the circuit further comprises:

and the fourth switching tube is used for conducting when the second switching tube breaks down to replace the second switching tube, the drain electrode of the fourth switching tube is connected between the source electrode of the third switching tube and the source electrode of the first switching tube, and the source electrode of the fourth switching tube is connected between the source electrode of the second switching tube and the negative terminal of the direct-current bus.

Further, the circuit further comprises:

and the fifth switching tube is used for being disconnected when the first switching tube and the second switching tube are not in fault, the source electrode of the fifth switching tube is connected between the source electrode of the first switching tube and the drain electrode of the second switching tube, and the drain electrode of the fourth switching tube is connected between the source electrodes of the third switching tube.

Further, the circuit further comprises:

a third switch, a fourth switch, and a fifth switch, wherein the third switch is connected between the second end of the inductor and the battery positive terminal; the fourth switch is connected between the second end of the resistor and the positive terminal of the storage battery; the fifth switch is connected between the source electrode of the second switch tube and the negative electrode terminal of the storage battery.

The invention also provides an energy storage cabinet, comprising: the energy storage cabinet also comprises the DC-DC conversion circuit.

Further, the controller is configured to collect a voltage of the dc bus, collect voltages at two ends of the capacitor, and control on/off of the first switch and the second switch according to the voltage of the dc bus and the voltages at two ends of the capacitor.

Further, the controller is also used for controlling the on-off of the third switch, the fourth switch and the fifth switch.

Furthermore, the auxiliary power supply is used for supplying power to the controller after the direct current bus gets power.

The invention also provides a thermal access control method of the energy storage cabinet, which is applied to the energy storage cabinet and comprises the following steps:

judging whether the first switch tube has a fault;

if yes, the third switching tube is controlled to be conducted to replace the first switching tube.

Further, before determining whether the first switch tube is failed, the method further includes:

after a direct-current bus positive terminal and a direct-current bus negative terminal of the energy storage cabinet are connected to a direct-current bus, controlling the first switch to be closed to enable the first switch tube to be conducted;

and collecting the voltage of the direct current bus and the voltage at the two ends of the capacitor, and controlling the on-off of the first switch and the second switch according to the voltage of the direct current bus and the voltage at the two ends of the capacitor.

Further, controlling the on/off of the first switch and the second switch according to the dc bus voltage and the voltage across the capacitor includes:

judging whether the ratio of the voltage at the two ends of the capacitor to the voltage of the direct current bus exceeds a preset value or not;

and if so, controlling the first switch to be opened and controlling the second switch to be closed.

Further, after controlling the second switch to be closed, the method further includes:

judging whether the storage battery needs to be charged or discharged;

if the storage battery needs to be discharged, the fifth switch and the third switch are controlled to be closed;

if the storage battery needs to be charged, the fifth switch and the fourth switch are controlled to be switched on and off;

wherein the third switch is connected between the second end of the inductor and the battery positive terminal; the fourth switch is connected between the second end of the resistor and the positive terminal of the storage battery; the fifth switch is connected between the source electrode of the second switch tube and the negative electrode terminal of the storage battery.

Further, after controlling the second switch to be closed, the method further includes:

judging whether the second switch tube has a fault;

if yes, the fourth switching tube is controlled to be conducted to replace the second switching tube.

Further, after controlling the second switch to be closed, the method further includes:

if the first switching tube and the second switching tube are not in fault, controlling a fifth switching tube to be switched off;

if the first switching tube or the second switching tube has a fault, controlling a fifth switching tube to be conducted;

the source electrode of the fifth switching tube is connected between the source electrode of the first switching tube and the drain electrode of the second switching tube, and the drain electrode of the fourth switching tube is connected between the source electrodes of the third switching tube.

The invention also provides a computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the above-mentioned method.

By applying the technical scheme of the invention, the spare switching tube is arranged and is connected in parallel with the original switching tube in the circuit, so that when the elements of the DC-DC conversion circuit are damaged, the spare switching tube is started, and the normal operation of the whole system can be ensured when the elements of the DC-DC conversion circuit are damaged.

Drawings

Fig. 1 is a block diagram of a DC-DC conversion circuit according to an embodiment of the present invention;

fig. 2 is a block diagram of a DC-DC converter circuit according to another embodiment of the present invention;

fig. 3 is a block diagram of a DC-DC conversion circuit according to still another embodiment of the present invention;

FIG. 4 is a block diagram of an energy storage cabinet according to an embodiment of the invention;

fig. 5 is a flowchart of a method for controlling thermal access to an energy storage cabinet according to an embodiment of the invention;

fig. 6 is a flowchart of a method for controlling thermal access to an energy storage cabinet according to another embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be understood that although the terms first, second, third, etc. may be used to describe the switching tubes in embodiments of the present invention, the switching tubes should not be limited to these terms. These terms are only used to separate different switch tubes. For example, the first switch tube may also be referred to as the second switch tube, and similarly, the second switch tube may also be referred to as the first switch tube without departing from the scope of the embodiments of the present invention.

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

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.

Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.