Regulation circuit, energy storage system, and control method of regulation circuit

Abstract

The present application relates to a regulation circuit, an energy storage system, and a control method for the regulation circuit. The regulation circuit includes a first-stage circuit and a second-stage circuit; the first-stage circuit includes a high-voltage port, the second-stage circuit includes a low-voltage port, and the first-stage circuit and the second-stage circuit are connected; the first-stage circuit and the second-stage circuit are used to regulate the voltage input to the high-voltage port and output it from the low-voltage port, or to regulate the voltage input to the low-voltage port and output it from the high-voltage port. Using this application can expand the voltage regulation range to meet regulation requirements.

Description

Technical Field

[0001] The present application relates to the technical field of battery energy storage, and in particular to a regulation circuit, an energy storage system, and a control method for the regulation circuit. Background Art

[0002] With the rapid development of new energy technologies, energy storage systems have become one of the more important research directions in the field of new energy. Energy storage systems usually include multiple parallel battery clusters, each of which consists of multiple series-connected batteries.

[0003] When charging and discharging an energy storage system, voltage differences may occur between multiple battery clusters, causing internal circulation and damaging the batteries. Therefore, a regulation circuit is usually set in the battery cluster to reduce the voltage difference between the battery clusters.

[0004] However, the existing regulation circuit still has the problem of not being able to meet the regulation requirements. Summary of the Invention

[0005] Based on the above problems, the present application provides a regulation circuit, an energy storage system and a control method for the regulation circuit, and the regulation circuit can meet the regulation requirements.

[0006] In a first aspect, the present application provides a regulation circuit, which includes a first-stage circuit and a second-stage circuit; the first-stage circuit includes a high-voltage port, the second-stage circuit includes a low-voltage port, and the first-stage circuit is connected to the second-stage circuit; the first-stage circuit and the second-stage circuit are used to regulate the voltage input to the high-voltage port and then output it from the low-voltage port, or to regulate the voltage input to the low-voltage port and then output it from the high-voltage port.

[0007] In the technical solution of the embodiment of the present application, by performing two voltage adjustments through the first-stage circuit and the second-stage circuit, the voltage adjustment range of the adjustment circuit can be expanded, so that the adjustment circuit meets the adjustment requirements.

[0008] In some embodiments, the second-stage circuit includes a first inductor circuit and a second inductor circuit, the first inductor circuit and the second inductor circuit being connected in parallel; the first inductor circuit and the second inductor circuit are both used to regulate the output voltage of the first-stage circuit or the voltage input to the low-voltage port. In the technical solutions of the embodiments of the present application, the second-stage circuit can perform voltage regulation using the first inductor circuit and the second inductor circuit, thereby expanding the voltage regulation range of the regulation circuit and enabling the regulation circuit to meet regulation requirements.

[0009] In some embodiments, the first inductor circuit includes a first switching circuit and a first inductor, and the second inductor circuit includes a second switching circuit and a second inductor; the first switching circuit is connected to the first-stage circuit and the first inductor, respectively, and the second switching circuit is connected to the first-stage circuit and the second inductor, respectively, with a common end of the first and second inductors connected to a low-voltage port; the first switching circuit is configured to conduct a path between the first-stage circuit and the first inductor under the control of a control circuit external to the regulation circuit; and the second switching circuit is configured to conduct a path between the first-stage circuit and the second inductor under the control of a control circuit external to the regulation circuit. In the technical solutions of the embodiments of the present application, both the first and second inductors can perform voltage regulation, which can improve the reliability of voltage regulation.

[0010] In some embodiments, a phase difference exists between the drive signal of the first switching circuit and the drive signal of the second switching circuit. In the technical solution of the embodiment of the present application, the first switching circuit and the second switching circuit are staggered in parallel to reduce the line current and the rate of change of the current over time, thereby optimizing electromagnetic compatibility and improving the accuracy of the system's current control.

[0011] In some embodiments, the second-stage circuit further includes a first capacitor and a polarity adjustment circuit; the first end of the first capacitor is connected to the common end of the first inductor and the second inductor, and the second end of the first capacitor is connected to the polarity adjustment circuit; the polarity adjustment circuit is configured to adjust the polarity of the output voltage of the low-voltage port. In the technical solutions of the embodiments of the present application, the regulation circuit can implement a four-quadrant power supply, and bidirectional energy flow is highly efficient.

[0012] In some embodiments, the first-stage circuit includes a first voltage conversion circuit and a second voltage conversion circuit; the first voltage conversion circuit and the second voltage conversion circuit are connected in series on a side close to the high-voltage port and in parallel on a side close to the second-stage circuit; the first voltage conversion circuit and the second voltage conversion circuit are both used to regulate the voltage input to the high-voltage port or the output voltage of the second-stage circuit. In the technical solutions of the embodiments of the present application, the first-stage circuit can achieve voltage balancing of the input voltage and current balancing of the output current, and the differences in the components in the first-stage circuit have little effect on voltage and current balancing.

[0013] In some embodiments, the first voltage conversion circuit includes a first primary circuit, a first resonant circuit, and a first secondary circuit connected in sequence; the first primary circuit is further connected to the high-voltage port, and the first secondary circuit is further connected to the second-stage circuit; the second voltage conversion circuit includes a second primary circuit, a second resonant circuit, and a second secondary circuit connected in sequence; the second primary circuit is further connected to the high-voltage port, and the second secondary circuit is further connected to the second-stage circuit. In the technical solution of the embodiments of the present application, the first-stage circuit can achieve voltage balancing of the input voltage and current balancing of the output current, and can reduce the difficulty of circuit control.

[0014] In some embodiments, a phase difference exists between the drive signal of the first transformer circuit and the drive signal of the second transformer circuit. In the technical solution of the embodiment of the present application, the first transformer circuit and the second transformer circuit are connected in parallel in an interlaced manner, which can reduce the rate of change of voltage and current over time, thereby optimizing electromagnetic compatibility.

[0015] In some embodiments, the first-stage circuit further includes a second capacitor and a third capacitor connected in series; the first end of the second capacitor is connected to the high-voltage port and the common end of the first transformer circuit; the common ends of the second and third capacitors are connected to the first transformer circuit and the second transformer circuit, respectively; and the first end of the third capacitor is connected to the high-voltage port. In the technical solution of the embodiments of the present application, the second and third capacitors can divide the voltage input from the high-voltage port, thereby reducing the voltage pressure on the switching tube in the first-stage circuit, thereby reducing the difficulty in selecting the switching tube, the cost, and the switching loss in the first-stage circuit.

[0016] In a second aspect, the present application also provides an energy storage system, which includes a control circuit, multiple parallel battery clusters and at least one regulation circuit as in the first aspect; the high-voltage port of the regulation circuit is connected in parallel with the corresponding connected battery cluster, and the low-voltage port of the regulation circuit is connected in series with the corresponding connected battery cluster; the control circuit is used to control the regulation circuit to perform voltage regulation.

[0017] In the technical solution of the embodiment of the present application, since the regulation circuit in the energy storage system can perform two-stage voltage regulation, the voltage regulation range is larger, and the cluster voltage of the battery cluster can be better regulated, thereby avoiding the problem of internal circulation caused by voltage differences between battery clusters.

[0018] In a third aspect, the present application further provides a control method for a regulating circuit, the method comprising:

[0019] The first stage circuit and the second stage circuit of the control regulating circuit regulate the voltage inputted from the high voltage port and output it from the low voltage port;

[0020] Alternatively, the first-stage circuit and the second-stage circuit are controlled to adjust the voltage input to the low-voltage port and then output it from the high-voltage port.

[0021] In the technical solution of the embodiment of the present application, the first-stage circuit and the second-stage circuit of the control regulation circuit perform voltage regulation twice, which can expand the voltage regulation range of the regulation circuit, so that the regulation circuit meets the regulation requirements.

[0022] In some embodiments, the second-stage circuit includes a first inductor circuit and a second inductor circuit, and the method further includes controlling the first inductor circuit and the second inductor circuit to adjust the output voltage of the first-stage circuit or the voltage input to the low-voltage port. In the technical solutions of the embodiments of the present application, the second-stage circuit can perform voltage regulation using the first inductor circuit and the second inductor circuit, thereby expanding the voltage regulation range of the regulation circuit and enabling the regulation circuit to meet regulation requirements.

[0023] In some embodiments, the first-stage circuit includes a first voltage conversion circuit and a second voltage conversion circuit; the method further includes controlling the first and second voltage conversion circuits to adjust the voltage input to the high-voltage port or the output voltage of the second-stage circuit. In the technical solutions of the embodiments of the present application, the first-stage circuit can achieve voltage balancing of the input voltage and current balancing of the output current, and differences in components in the first-stage circuit have little impact on voltage and current balancing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the optional embodiments below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0025] Figure 1 This is one of the structural diagrams of the regulating circuit according to one embodiment of the present application;

[0026] Figure 2 This is the second structural diagram of the regulating circuit according to one embodiment of the present application;

[0027] Figure 3 This is the third structural diagram of the regulating circuit according to one embodiment of the present application;

[0028] Figure 4 This is the fourth structural diagram of the regulating circuit according to one embodiment of the present application;

[0029] Figure 5 This is the fifth structural diagram of the regulating circuit according to one embodiment of the present application;

[0030] Figure 6 This is the sixth structural diagram of the regulating circuit according to one embodiment of the present application;

[0031] Figure 7 This is the seventh structural diagram of the regulating circuit according to one embodiment of the present application;

[0032] Figure 8 This is the eighth structural diagram of the regulating circuit according to one embodiment of the present application;

[0033] Figure 9This is a ninth structural diagram of a regulating circuit according to an embodiment of the present application;

[0034] Figure 10 This is the tenth structural diagram of the regulating circuit according to one embodiment of the present application;

[0035] Figure 11 It is a structural diagram of an energy storage system according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0038] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0039] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0041] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0042] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0043] Currently, regulation circuits often use a two-stage architecture, where the first stage performs voltage regulation and electrical isolation, while the second stage adjusts voltage polarity. This puts significant pressure on the first stage when voltage regulation over a wide range is required, and the regulation circuit may not be able to meet the regulation requirements.

[0044] An embodiment of the present application provides a regulation circuit. The regulation circuit includes a first-stage circuit and a second-stage circuit; the first-stage circuit includes a high-voltage port, the second-stage circuit includes a low-voltage port, and the first-stage circuit and the second-stage circuit are connected; the first-stage circuit and the second-stage circuit regulate the voltage input to the high-voltage port and output it from the low-voltage port, or regulate the voltage input to the low-voltage port and output it from the high-voltage port. In the embodiment of the present application, the second-stage circuit can also perform voltage regulation. This can reduce the voltage regulation pressure of the first-stage circuit, expand the voltage regulation range of the regulation circuit, and thus enable the regulation circuit to meet the regulation requirements.

[0045] The regulating circuit, energy storage system, and regulating circuit control method disclosed in the embodiments of the present application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft, and are not limited to being used in charging equipment for various electrical devices.

[0046] According to some embodiments of the present application, referring to Figure 1 , provides a regulation circuit. The regulation circuit 10 includes a first-stage circuit 11 and a second-stage circuit 12; the first-stage circuit 11 includes a high-voltage port, and the second-stage circuit 12 includes a low-voltage port, and the first-stage circuit 11 and the second-stage circuit 12 are connected; the first-stage circuit 11 and the second-stage circuit 12 are used to regulate the voltage input to the high-voltage port and output it from the low-voltage port, or to regulate the voltage input to the low-voltage port and output it from the high-voltage port.

[0047] In the embodiment of the present application, the regulation circuit 10 includes a first-stage circuit 11 and a second-stage circuit 12, which are interconnected. The first-stage circuit 11 includes a high-voltage port, and the second-stage circuit 12 includes a low-voltage port. The regulation circuit 10 can be connected to the battery cluster to be regulated through the high-voltage port and the low-voltage port, thereby regulating the voltage of the battery cluster.

[0048] The voltage regulation process may include: inputting a voltage to the high-voltage port, sequentially regulating the voltage input to the high-voltage port by the first-stage circuit 11 and the second-stage circuit 12, i.e., performing two voltage adjustments, and then outputting the regulated voltage from the low-voltage port. Alternatively, inputting a voltage to the low-voltage port, sequentially regulating the voltage input to the low-voltage port by the second-stage circuit 12 and the first-stage circuit 11, i.e., performing two voltage adjustments, and then outputting the regulated voltage from the high-voltage port.

[0049] It can be understood that the regulating circuit 10 can implement bidirectional regulation, that is, it can adjust high voltage to low voltage, and also adjust low voltage to high voltage.

[0050] The aforementioned regulation circuit includes a first-stage circuit and a second-stage circuit connected to each other. The first-stage circuit includes a high-voltage port, and the second-stage circuit includes a low-voltage port. The first-stage circuit and the second-stage circuit can regulate the voltage input to the high-voltage port and output it from the low-voltage port, and can also regulate the voltage input to the low-voltage port and output it from the high-voltage port. In the embodiment of the present application, by performing two voltage adjustments in the first and second-stage circuits, the voltage regulation range of the regulation circuit can be expanded, thereby enabling the regulation circuit to meet regulation requirements.

[0051] According to some embodiments of the present application, referring to Figure 2 The second-stage circuit 12 includes a first inductor circuit 121 and a second inductor circuit 122, which are connected in parallel. The first inductor circuit 121 and the second inductor circuit 122 are both used to adjust the output voltage of the first-stage circuit 11 or the voltage input to the low-voltage port.

[0052] In an embodiment of the present application, the second-stage circuit 12 includes a first inductor circuit 121 and a second inductor circuit 122 connected in parallel. The voltage regulation process of the second-stage circuit 12 may include: the first-stage circuit 11 outputs a regulated voltage, the first inductor circuit 121 and the second inductor circuit 122 both regulate the output voltage of the first-stage circuit 11, and then output the regulated voltage from the low-voltage port. Alternatively, the low-voltage port inputs a voltage, the first inductor circuit 121 and the second inductor circuit 122 both regulate the voltage input to the low-voltage port, and then output the regulated voltage to the first-stage circuit 11.

[0053] In the above embodiment, the second-stage circuit includes a first inductor circuit and a second inductor circuit connected in parallel. Both the first inductor circuit and the second inductor circuit can regulate the output voltage of the first-stage circuit or the voltage input to the low-voltage port. Compared to conventional techniques in which the second-stage circuit does not perform voltage regulation, the second-stage circuit in the embodiment of the present application can perform voltage regulation through the first and second inductor circuits, thereby expanding the voltage regulation range of the regulation circuit and enabling the regulation circuit to meet regulation requirements.

[0054] According to some embodiments of the present application, referring to Figure 3 The first inductor circuit 121 includes a first switching circuit 1211 and a first inductor L1, and the second inductor circuit 122 includes a second switching circuit 1221 and a second inductor L2; the first switching circuit 1211 is connected to the first-stage circuit 11 and the first inductor L1, respectively, and the second switching circuit 1221 is connected to the first-stage circuit 11 and the second inductor L2, respectively, and the common end of the first inductor L1 and the second inductor L2 is connected to the low-voltage port; the first switching circuit 1211 is used to conduct the path between the first-stage circuit 11 and the first inductor L1 under the control of a control circuit outside the regulation circuit 10; the second switching circuit 1221 is used to conduct the path between the first-stage circuit 11 and the second inductor L2 under the control of a control circuit outside the regulation circuit 10.

[0055] In the embodiment of the present application, the first inductor circuit 121 may include a first switch circuit 1211 and a first inductor L1, and the second inductor circuit 122 may include a second switch circuit 1221 and a second inductor L2. The first switch circuit 1211 is connected to the first-stage circuit 11 and the first inductor L1, respectively; the second switch circuit 1221 is connected to the first-stage circuit 11 and the second inductor L2, respectively; the first inductor L1 is connected to the second inductor L2, and a common terminal of the first inductor L1 and the second inductor L2 is connected to the low-voltage port.

[0056] A control circuit is provided outside the regulating circuit 10 , and the control circuit inputs driving signals to the first switching circuit 1211 and the second switching circuit 1221 respectively.

[0057] Under the control of the driving signal, the first switching circuit 1211 turns on the path between the first-stage circuit 11 and the first inductor L1, so that the first inductor L1 can adjust the output voltage of the first-stage circuit 11 and output the adjusted voltage from the low-voltage port, or the first inductor L1 can adjust the voltage input to the low-voltage port and output the adjusted voltage to the first-stage circuit 11.

[0058] Under the control of the driving signal, the second switching circuit 1221 turns on the path between the first-stage circuit 11 and the second inductor L2, so that the second inductor L2 can adjust the output voltage of the first-stage circuit 11 and output the adjusted voltage from the low-voltage port, or it can adjust the voltage input to the low-voltage port and output the adjusted voltage to the first-stage circuit 11.

[0059] Reference Figure 4 The first switching circuit 1211 may include a switch transistor M1 and a switch transistor M2. The control electrodes of the switch transistors M1 and M2 are connected to a control circuit external to the regulation circuit 10 and receive a drive signal output by the control circuit. The first electrode of the switch transistor M1 is connected to the first-stage circuit 11, and the second electrode of the switch transistor M1 is connected to the first end of the first inductor L1. The first electrode of the switch transistor M2 is connected to the first end of the first inductor L1, and the second electrode of the switch transistor M2 is connected to the first-stage circuit 11.

[0060] Reference Figure 4 The second switching circuit 1221 may include a switch M3 and a switch M4. The control electrodes of the switch M3 and the switch M4 are connected to a control circuit external to the regulation circuit 10 and receive a drive signal output by the control circuit. The first electrode of the switch M3 is connected to the first-stage circuit 11, and the second electrode of the switch M3 is connected to the first end of the second inductor L2. The first electrode of the switch M4 is connected to the first end of the second inductor L2, and the second electrode of the switch M4 is connected to the first-stage circuit 11.

[0061] The second end of the first inductor L1 is connected to the second end of the second inductor L2 and the low-voltage port.

[0062] According to some embodiments of the present application, there is a phase difference between the driving signal of the first switch circuit 1211 and the driving signal of the second switch circuit 1221 .

[0063] The first switch circuit 1211 and the second switch circuit 1221 are connected in parallel. The drive signals of the first switch circuit 1211 and the second switch circuit 1221 can be in phase or out of phase. When there is a phase difference between the drive signals of the first switch circuit 1211 and the second switch circuit 1221, the switch M1 or M2 in the first switch circuit 1211 turns on, connecting the first-stage circuit 11 and the first inductor L1. After a first predetermined phase difference, the switch M3 or M4 in the second switch circuit 1221 turns on, connecting the first-stage circuit 11 and the second inductor L2.

[0064] In the above embodiment, the first inductor circuit includes a first switching circuit and a first inductor, and the second inductor circuit includes a second switching circuit and a second inductor. The first switching circuit, under the control of a control circuit external to the regulation circuit, conducts a path between the first-stage circuit and the first inductor; the second switching circuit, under the control of a control circuit external to the regulation circuit, conducts a path between the first-stage circuit and the second inductor. In this way, both the first and second inductors can perform voltage regulation, which not only improves the reliability of voltage regulation but also, when there is a phase difference between the drive signal of the first switching circuit and the drive signal of the second switching circuit, the first and second switching circuits can be staggered in parallel to reduce line current and the rate of change of current over time, thereby optimizing electromagnetic compatibility and improving the accuracy of system current control.

[0065] According to some embodiments of the present application, referring to Figure 5 The second-stage circuit 12 also includes a first capacitor C1 and a polarity adjustment circuit 123; the first end of the first capacitor C1 is connected to the common end of the first inductor L1 and the second inductor L2, and the second end of the first capacitor C1 is connected to the polarity adjustment circuit 123; the polarity adjustment circuit 123 is used to adjust the polarity of the output voltage of the low-voltage port.

[0066] In an embodiment of the present application, the second-stage circuit 12 also includes a first capacitor C1 and a polarity adjustment circuit 123. The first end of the first capacitor C1 is connected to the common end of the first inductor L1 and the second inductor L2, and is also connected to the low-voltage port; the second end of the first capacitor C1 is connected to the polarity adjustment circuit 123, and is also connected to the low-voltage port.

[0067] Reference Figure 6 Polarity adjustment circuit 123 includes switch M5 and switch M6. The control electrodes of switch M5 and switch M6 are both connected to a control circuit external to regulation circuit 10 and receive drive signals input from the control circuit. A first electrode of switch M5 is connected to first-stage circuit 11, and a second electrode of switch M5 is connected to the second end of first capacitor C1. A first electrode of switch M6 is connected to the second end of first capacitor C1, and a second electrode of switch M6 is connected to first-stage circuit 11.

[0068] It can be understood that when the first switch circuit 1211 and the second switch circuit 1221 are connected in parallel in an alternating manner, the current flowing through the first capacitor C1 can be reduced, thereby reducing the current stress.

[0069] In the second-stage circuit 12 , the switches M1 , M2 , M3 , and M4 serve as active transistors; the switches M5 and M6 serve as directional transistors, which can adjust the polarity of the output voltage of the low-voltage port.

[0070] Reference Figure 6When the second-stage circuit 12 regulates the output voltage of the first-stage circuit 11, the energy of the regulation circuit 10 flows in the forward direction, the switch tubes M1 and M3 are turned on, and the switch tubes M2 and M4 are turned off; if the switch tube M6 is turned on, the currents in the first inductor L1 and the second inductor L2 flow from the first-stage circuit 11 to the low-voltage port, and the voltage across the first capacitor C1 is the first polarity; if the switch tube M5 is turned on, the currents in the first inductor L1 and the second inductor L2 flow from the low-voltage port to the first-stage circuit 11, and the voltage across the first capacitor C1 is the second polarity.

[0071] Reference Figure 6 When the second-stage circuit 12 regulates the voltage input to the low-voltage port, the energy of the regulation circuit 10 flows in the reverse direction, the switch tubes M1 and M3 are turned off, and the switch tubes M2 and M4 are turned on; if the switch tube M6 is turned on, the currents in the first inductor L1 and the second inductor L2 flow from the low-voltage port to the first-stage circuit 11, and the voltage across the first capacitor C1 is the first polarity; if the switch tube M5 is turned on, the currents in the first inductor L1 and the second inductor L2 flow from the first-stage circuit 11 to the low-voltage port, and the voltage across the first capacitor C1 is the second polarity.

[0072] The first polarity is opposite to the second polarity. For example, if the first polarity is positive, the second polarity is negative.

[0073] In the above embodiment, the second stage circuit further includes a first capacitor and a polarity adjustment circuit; the polarity adjustment circuit can adjust the polarity of the output voltage of the low voltage port. The regulation circuit of the embodiment of the present application can realize a four-quadrant power supply, and the bidirectional energy flow is highly efficient.

[0074] According to some embodiments of the present application, referring to Figure 7 The first-stage circuit 11 includes a first transformer circuit 111 and a second transformer circuit 112; the first transformer circuit 111 and the second transformer circuit 112 are connected in series on the side close to the high-voltage port and in parallel on the side close to the second-stage circuit 12; the first transformer circuit 111 and the second transformer circuit 112 are both used to adjust the voltage input to the high-voltage port or the output voltage of the second-stage circuit 12.

[0075] In the embodiment of the present application, the first-stage circuit 11 includes a first transformer circuit 111 and a second transformer circuit 112 , wherein the first transformer circuit 111 and the second transformer circuit 112 are connected in series on the side close to the high-voltage port and in parallel on the side close to the second-stage circuit 12 .

[0076] The voltage regulation process of the first-stage circuit 11 may include: a voltage is input to the high-voltage port, the first voltage conversion circuit 111 and the second voltage conversion circuit 112 both regulate the voltage input to the high-voltage port, and then output the regulated voltage to the second-stage circuit 12. Alternatively, the second-stage circuit 12 outputs a voltage, the first voltage conversion circuit 111 and the second voltage conversion circuit 112 both regulate the voltage output from the second-stage circuit 12, and then output the regulated voltage from the high-voltage port.

[0077] In the above embodiment, the first-stage circuit includes a first transformer circuit and a second transformer circuit; since the first transformer circuit and the second transformer circuit are connected in series on the side close to the high-voltage port and in parallel on the side close to the second-stage circuit, the first-stage circuit can achieve voltage balancing of the input voltage and current balancing of the output current, and the differences in the components in the first-stage circuit have little effect on voltage and current balancing. Furthermore, the series connection can make the current of the devices close to the high-voltage port in the first transformer circuit and the second transformer circuit consistent, so there is no need to set a current balancing ring in the first transformer circuit and the second transformer circuit; the parallel connection can make the voltage of the devices close to the second-stage circuit in the first transformer circuit and the second transformer circuit consistent, so there is no need to set a voltage balancing ring in the first transformer circuit and the second transformer circuit, thus reducing the difficulty of circuit control.

[0078] According to some embodiments of the present application, referring to Figure 8 The first transformer circuit 111 includes a first primary circuit 1111, a first resonant circuit 1112, and a first secondary circuit 1113 connected in sequence; the first primary circuit 1111 is also connected to the high-voltage port, and the first secondary circuit 1113 is also connected to the second-stage circuit 12; the second transformer circuit 112 includes a second primary circuit 1121, a second resonant circuit 1122, and a second secondary circuit 1123 connected in sequence; the second primary circuit 1121 is also connected to the high-voltage port, and the second secondary circuit 1123 is also connected to the second-stage circuit 12.

[0079] In the embodiment of the present application, the first voltage conversion circuit 111 includes a first primary circuit 1111, a first resonant circuit 1112, and a first secondary circuit 1113 connected in sequence; the first primary circuit 1111 is also connected to the high-voltage port, and the first secondary circuit 1113 is also connected to the second-stage circuit 12. The second voltage conversion circuit 112 includes a second primary circuit 1121, a second resonant circuit 1122, and a second secondary circuit 1123 connected in sequence; the second primary circuit 1121 is also connected to the high-voltage port, and the second secondary circuit 1123 is also connected to the second-stage circuit 12.

[0080] Reference Figure 9The first resonant circuit 1112 includes a transformer N1, an inductor L3, and a capacitor C4. The first primary circuit 1111 includes switch tubes M7, M8, M9, and M10. The first secondary circuit 1113 includes switch tubes M11, M12, M13, and M14.

[0081] In the first resonant circuit 1112, the first end of the inductor L3 is connected to the common terminal of the switches M7 and M8 in the first primary circuit 1111, and the second end of the inductor L3 is connected to the same-name terminal of the primary side of the transformer N1. The first end of the capacitor C4 is connected to the common terminal of the switches M9 and M10 in the first primary circuit 1111, and the second end of the capacitor C4 is connected to the opposite-name terminal of the primary side of the transformer N1. The same-name terminal of the secondary side of the transformer N1 is connected to the common terminal of the switches M11 and M12 in the first secondary circuit 1113, and the opposite-name terminal of the secondary side of the transformer N1 is connected to the common terminal of the switches M13 and M14 in the first secondary circuit 1113.

[0082] In the first primary circuit 1111, the control electrodes of the switches M7, M8, M9, and M10 are all connected to the control circuit outside the regulation circuit 10 and receive drive signals output by the control circuit. The first electrode of the switch M7 is connected to the high-voltage port, and the second electrode of the switch M7 is connected to the first end of the inductor L3. The first electrode of the switch M8 is connected to the first end of the inductor L3, and the second electrode of the switch M8 is connected to the second voltage conversion circuit 112. The first electrode of the switch M9 is connected to the high-voltage port, and the second electrode of the switch M9 is connected to the first end of the capacitor C4. The first electrode of the switch M10 is connected to the first end of the capacitor C4, and the second electrode of the switch M10 is connected to the second voltage conversion circuit 112.

[0083] In the first secondary circuit 1113, the control electrodes of the switches M11, M12, M13, and M14 are all connected to the control circuit outside the regulation circuit 10 and receive drive signals output by the control circuit. The first electrode of the switch M11 is connected to the first electrode of the switch M1 in the second-stage circuit 12, and the second electrode of the switch M11 is connected to the same-name terminal of the secondary side of the transformer N1. The first electrode of the switch M12 is connected to the same-name terminal of the secondary side of the transformer N1, and the second electrode of the switch M12 is connected to the second electrode of the switch M2 in the second-stage circuit 12. The first electrode of the switch M13 is connected to the first electrode of the switch M1 in the second-stage circuit 12, and the second electrode of the switch M13 is connected to the opposite-name terminal of the secondary side of the transformer N1. The first electrode of the switch M14 is connected to the opposite-name terminal of the secondary side of the transformer N1, and the second electrode of the switch M14 is connected to the second electrode of the switch M2 in the second-stage circuit 12.

[0084] Reference Figure 9The second resonant circuit 1122 includes a transformer N2, an inductor L4, and a capacitor C5. The second primary circuit 1121 includes switch tubes M15, M16, M17, and M18. The second secondary circuit 1123 includes switch tubes M19, M20, M21, and M22.

[0085] In the second resonant circuit 1122, the first end of the inductor L4 is connected to the common terminal of the switches M15 and M16 in the second primary circuit 1121, and the second end of the inductor L4 is connected to the same-name terminal of the primary side of the transformer N2. The first end of the capacitor C5 is connected to the common terminal of the switches M17 and M18 in the second primary circuit 1121, and the second end of the capacitor C5 is connected to the opposite-name terminal of the primary side of the transformer N2. The same-name terminal of the secondary side of the transformer N2 is connected to the common terminal of the switches M19 and M20 in the second secondary circuit 1123, and the opposite-name terminal of the secondary side of the transformer N2 is connected to the common terminal of the switches M21 and M22 in the second secondary circuit 1123.

[0086] In the second primary circuit 1121, the control electrodes of the switches M15, M16, M17, and M18 are all connected to a control circuit external to the regulation circuit 10 and receive drive signals output by the control circuit. The first electrode of the switch M15 is connected to the second electrode of the switch M8 and the second electrode of the switch M10 in the first voltage conversion circuit 111. The second electrode of the switch M15 is connected to the first end of the inductor L4. The first electrode of the switch M16 is connected to the first end of the inductor L4, and the second electrode of the switch M16 is connected to the high-voltage port. The first electrode of the switch M17 is connected to the second electrode of the switch M8 and the second electrode of the switch M10 in the first voltage conversion circuit 111. The second electrode of the switch M17 is connected to the first end of the capacitor C5. The first electrode of the switch M18 is connected to the first end of the capacitor C5, and the second electrode of the switch M18 is connected to the high-voltage port.

[0087] Optionally, the high-voltage port may include a high-voltage contact point and a low-voltage contact point. The first electrode of the switch transistor M7 and the first electrode of the switch transistor M9 are connected to the high-voltage contact point in the high-voltage port; the second electrode of the switch transistor M16 and the second electrode of the switch transistor M18 are connected to the low-voltage contact point in the high-voltage port. The voltage of the low-voltage contact point can be set to 0V.

[0088] In the second secondary circuit 1123, the control electrodes of the switches M19, M20, M21, and M22 are all connected to the control circuit outside the regulation circuit 10 and receive drive signals output by the control circuit. The first electrode of the switch M19 is connected to the first electrode of the switch M1 in the second-stage circuit 12, and the second electrode of the switch M19 is connected to the same-name terminal of the secondary side of the transformer N2. The first electrode of the switch M20 is connected to the same-name terminal of the secondary side of the transformer N2, and the second electrode of the switch M20 is connected to the second electrode of the switch M2 in the second-stage circuit 12. The first electrode of the switch M21 is connected to the first electrode of the switch M1 in the second-stage circuit 12, and the second electrode of the switch M21 is connected to the opposite-name terminal of the secondary side of the transformer N2. The first electrode of the switch M22 is connected to the opposite-name terminal of the secondary side of the transformer N2, and the second electrode of the switch M22 is connected to the second electrode of the switch M2 in the second-stage circuit 12.

[0089] According to some embodiments of the present application, the first-stage circuit 11 may further include a capacitor C6, a first end of the capacitor C6 being connected to the first electrode of the switch tube M13 and the first electrode of the switch tube M21 in the first-stage circuit 11, and the first electrode of the switch tube M1 and the first electrode of the switch tube M3 in the second-stage circuit 12; the second end of the capacitor C6 being connected to the second electrode of the switch tube M14 and the second electrode of the switch tube M22 in the first-stage circuit 11, and the second electrode of the switch tube M2 and the second electrode of the switch tube M4 in the second-stage circuit 12.

[0090] According to some embodiments of the present application, there is a phase difference between the driving signal of the first voltage conversion circuit 111 and the driving signal of the second voltage conversion circuit 112 .

[0091] In the first transformer circuit 111, the switches M7, M8, M9, and M10 of the first primary circuit 1111 receive drive signals output by the control circuit. The drive signal for switch M7 is complementary in phase to the drive signal for switch M8, the drive signal for switch M9 is complementary in phase to the drive signal for switch M10, and the drive signal for switch M7 is in phase with the drive signal for switch M10.

[0092] In the first transformer circuit 111, the switches M11, M12, M13, and M14 of the first secondary circuit 1113 receive drive signals output by the control circuit. The drive signal for switch M11 is complementary in phase to the drive signal for switch M12, the drive signal for switch M13 is complementary in phase to the drive signal for switch M14, and the drive signal for switch M11 is in phase with the drive signal for switch M14.

[0093] In the second transformer circuit 112, the switches M15, M16, M17, and M18 of the second primary circuit 1121 receive drive signals output by the control circuit. The drive signal for switch M15 and the drive signal for switch M16 are complementary in phase, the drive signal for switch M17 and the drive signal for switch M18 are complementary in phase, and the drive signal for switch M15 and the drive signal for switch M18 are in phase.

[0094] In the second voltage conversion circuit 112, the switches M19, M20, M21, and M22 of the first secondary circuit 1113 receive drive signals output by the control circuit. The drive signal for switch M19 and the drive signal for switch M20 are complementary in phase, the drive signal for switch M21 and the drive signal for switch M22 are complementary in phase, and the drive signal for switch M19 and the drive signal for switch M22 are in phase.

[0095] The drive signal of the switch M7 in the first conversion circuit 111 and the drive signal of the switch M15 in the second conversion circuit 112 may be in the same phase or may have a phase difference. For example, the phase difference between the drive signal of the switch M7 and the drive signal of the switch M15 is 90°. It is understood that if there is a phase difference between the switch M7 and the switch M15, the drive signals of the other switches in the first conversion circuit and the second conversion circuit will also have a corresponding phase difference.

[0096] In the above embodiment, the first transformer circuit and the second transformer circuit are connected in series on one side close to the high-voltage port and in parallel on the other side close to the second-stage circuit. Therefore, the first-stage circuit can achieve voltage balancing of the input voltage and current balancing of the output current. Moreover, when there is a phase difference between the driving signal of the first transformer circuit and the driving signal of the second transformer circuit, the first transformer circuit and the second transformer circuit are staggered in parallel, which can reduce the rate of change of voltage over time and the rate of change of current over time, thereby optimizing electromagnetic compatibility.

[0097] According to some embodiments of the present application, referring to Figure 10 The first-stage circuit 11 also includes a second capacitor C2 and a third capacitor C3 connected in series; the first end of the second capacitor C2 is connected to the high-voltage port and the common end of the first voltage conversion circuit 111; the common end of the second capacitor C2 and the third capacitor C3 is connected to the first voltage conversion circuit 111 and the second voltage conversion circuit 112 respectively; the first end of the third capacitor C3 is connected to the high-voltage port.

[0098] In the embodiment of the present application, the first-stage circuit 11 may further include a second capacitor C2 and a third capacitor C3, with the second capacitor C2 and the third capacitor C3 connected in series. The first end of the second capacitor C2 is connected to the high-voltage contact point of the high-voltage port and the first electrode of the switch tube M7 in the first voltage conversion circuit 111, and the first end of the third capacitor C3 is connected to the low-voltage contact point of the high-voltage port. The common end of the second capacitor C2 and the third capacitor C3 is connected to the second electrode of the switch tube M8 in the first voltage conversion circuit 111 and the first electrode of the switch tube M15 in the second voltage conversion circuit 112.

[0099] In the above embodiment, the first-stage circuit also includes a second capacitor and a third capacitor connected in series. In this way, the second capacitor and the third capacitor can divide the voltage input from the high-voltage port, thereby reducing the voltage pressure of the switching tube in the first-stage circuit, thereby reducing the selection difficulty, cost and switching loss of the switching tube in the first-stage circuit.

[0100] According to some embodiments of the present application, referring to Figure 11 , provides an energy storage system. The energy storage system includes a control circuit 20, multiple parallel-connected battery clusters, and at least one regulation circuit 10 as described in the above embodiment. The high-voltage port of the regulation circuit 10 is connected in parallel with the corresponding battery cluster 20, and the low-voltage port of the regulation circuit 10 is connected in series with the corresponding battery cluster 20. The control circuit is used to control the regulation circuit 10 to perform voltage regulation.

[0101] In the embodiment of the present application, the energy storage system includes a control circuit 20, multiple parallel battery clusters, and at least one regulation circuit 10. In practical applications, a regulation circuit 10 may be provided in each battery cluster, or in some of the battery clusters. The embodiment of the present application does not limit the number of regulation circuits, and the number may be set according to actual circumstances.

[0102] The high-voltage port of the regulation circuit 10 is connected in parallel with the corresponding battery cluster, while the low-voltage port of the regulation circuit 10 is connected in series with the corresponding battery cluster. The control circuit 20 is connected to the control electrode of each switch in the regulation circuit 10. The control circuit can output a drive signal to each switch to turn the switch on or off, thereby controlling the regulation circuit 10 to perform voltage regulation.

[0103] The regulating circuit 10 may include a first-stage circuit 11 and a second-stage circuit 12; the first-stage circuit and the second-stage circuit may regulate the voltage input to the high-voltage port and output it from the low-voltage port, or may regulate the voltage input to the low-voltage port and output it from the high-voltage port.

[0104] In the above embodiment, the energy storage system includes a control circuit, multiple parallel-connected battery clusters, and at least one regulation circuit as described in the above embodiment. The high-voltage port of the regulation circuit is connected in parallel with the corresponding battery cluster, and the low-voltage port of the regulation circuit is connected in series with the corresponding battery cluster. The control circuit controls the regulation circuit to regulate voltage. Because the regulation circuit in the energy storage system can perform two-stage voltage regulation, the voltage regulation range is large, allowing for better regulation of the cluster voltage of the battery clusters, thereby avoiding the problem of internal circulation current caused by voltage differences between battery clusters.

[0105] According to some embodiments of the present application, a control method for a regulation circuit is provided. The method is applied to the regulation circuit in the above-mentioned embodiment and may include the following steps: controlling the first-stage circuit and the second-stage circuit of the regulation circuit to regulate the voltage input to the high-voltage port and then output it from the low-voltage port; or controlling the first-stage circuit and the second-stage circuit to regulate the voltage input to the low-voltage port and then output it from the high-voltage port.

[0106] A control circuit is provided outside the regulating circuit, and the control circuit can control the regulating circuit.

[0107] Reference Figure 1 The regulation circuit 10 includes a first-stage circuit 11 and a second-stage circuit 12 ; the first-stage circuit 11 includes a high-voltage port, the second-stage circuit 12 includes a low-voltage port, and the first-stage circuit 11 is connected to the second-stage circuit 12 .

[0108] The high-voltage port inputs a voltage, and the control circuit can control the first-stage circuit 11 and the second-stage circuit 12 to adjust the voltage input to the high-voltage port in turn, that is, perform voltage adjustment twice, and then output the adjusted voltage from the low-voltage port.

[0109] Alternatively, the low-voltage port inputs a voltage, and the control circuit can control the second-stage circuit 12 and the first-stage circuit 11 to adjust the voltage input to the low-voltage port in turn, that is, perform voltage adjustment twice, and then output the adjusted voltage from the high-voltage port.

[0110] In the technical solution of the embodiment of the present application, the first-stage circuit and the second-stage circuit of the control regulation circuit perform voltage regulation twice, which can expand the voltage regulation range of the regulation circuit, so that the regulation circuit meets the regulation requirements.

[0111] According to some embodiments of the present application, referring to Figure 2 The second-stage circuit 12 includes a first inductor circuit 121 and a second inductor circuit 122. The embodiment of the present application may further include: controlling the first inductor circuit and the second inductor circuit to adjust the output voltage of the first-stage circuit or the voltage input to the low-voltage port.

[0112] The second-stage circuit 12 includes a first inductor circuit 121 and a second inductor circuit 122 connected in parallel. The first-stage circuit 11 outputs a regulated voltage. The control circuit can control the first inductor circuit 121 and the second inductor circuit 122 to regulate the output voltage of the first-stage circuit 11, and then output the regulated voltage from the low-voltage port.

[0113] Alternatively, the low-voltage port inputs a voltage, and the control circuit can control both the first inductor circuit 121 and the second inductor circuit 122 to adjust the voltage inputted at the low-voltage port, and then output the adjusted voltage to the first-stage circuit 11 .

[0114] In the technical solution of the embodiment of the present application, controlling the first inductor circuit and the second inductor circuit to perform voltage regulation can expand the voltage regulation range of the regulation circuit and enable the regulation circuit to meet the regulation requirements.

[0115] According to some embodiments of the present application, referring to Figure 7 The first-stage circuit 11 includes a first transformer circuit 111 and a second transformer circuit 112. The embodiment of the present application may further include: controlling the first transformer circuit and the second transformer circuit to adjust the voltage input to the high-voltage port or the output voltage of the second-stage circuit.

[0116] The first stage circuit 11 includes a first voltage conversion circuit 111 and a second voltage conversion circuit 112 , wherein the first voltage conversion circuit 111 and the second voltage conversion circuit 112 are connected in series on a side close to the high voltage port and in parallel on a side close to the second stage circuit 12 .

[0117] The high-voltage port inputs a voltage, and the control circuit can control the first voltage conversion circuit 111 and the second voltage conversion circuit 112 to adjust the voltage input from the high-voltage port, and then output the adjusted voltage to the second-stage circuit 12.

[0118] Alternatively, the second stage circuit 12 outputs a voltage, and the control circuit can control both the first voltage conversion circuit 111 and the second voltage conversion circuit 112 to adjust the voltage output by the second stage circuit 12, and then output the adjusted voltage from the high voltage port.

[0119] In the technical solution of the embodiment of the present application, the first-stage circuit can achieve voltage balancing of the input voltage and current balancing of the output current, and the differences in the components in the first-stage circuit have little effect on voltage and current balancing. Furthermore, the series connection can make the current of the devices near the high-voltage port side of the first and second transformer circuits consistent, so there is no need to set a current balancing ring in the first and second transformer circuits; the parallel connection can make the voltage of the devices near the second-stage circuit side of the first and second transformer circuits consistent, so there is no need to set a voltage balancing ring in the first and second transformer circuits, thus reducing the difficulty of circuit control.

[0120] According to some embodiments of the present application, referring to Figure 10 The first-stage circuit 11 includes switches M7, M8, M9, M10, M11, M12, M13, M14, M15, M16, M17, M18, M19, M20, M21, and M22. The second-stage circuit 12 includes switches M1, M2, M3, M4, M5, and M6.

[0121] The control circuit inputs a driving signal to each switch tube to control the on and off of the switch tube.

[0122] The driving signal of the switch tube M1 is complementary to the driving signal of the switch tube M2 in phase, and the driving signal of the switch tube M3 is complementary to the driving signal of the switch tube M4 in phase. The driving signal of the switch tube M1 can be the same as the driving signal of the switch tube M3 or there can be a phase difference.

[0123] The driving signal of the switch tube M5 and the driving signal of the switch tube M6 are complementary in phase.

[0124] The driving signal of the switch tube M7 is complementary to the driving signal of the switch tube M8 in phase, the driving signal of the switch tube M9 is complementary to the driving signal of the switch tube M10 in phase, and the driving signal of the switch tube M7 is in the same phase as the driving signal of the switch tube M10.

[0125] The driving signal of the switch tube M11 is complementary to the driving signal of the switch tube M12 in phase, the driving signal of the switch tube M13 is complementary to the driving signal of the switch tube M14 in phase, and the driving signal of the switch tube M11 is in the same phase as the driving signal of the switch tube M14.

[0126] The driving signal of the switch tube M15 is complementary to the driving signal of the switch tube M16 in phase, the driving signal of the switch tube M17 is complementary to the driving signal of the switch tube M18 in phase, and the driving signal of the switch tube M15 is in the same phase as the driving signal of the switch tube M18.

[0127] The driving signal of the switch tube M19 is complementary to the driving signal of the switch tube M20 in phase, the driving signal of the switch tube M21 is complementary to the driving signal of the switch tube M22 in phase, and the driving signal of the switch tube M19 is in phase with the driving signal of the switch tube M22.

[0128] When the high-voltage port inputs voltage, the control circuit can control the first-stage circuit 11 and the second-stage circuit 12 to adjust the voltage input to the high-voltage port in turn, that is, perform voltage adjustment twice, and then output the adjusted voltage from the low-voltage port.

[0129] When the low-voltage port inputs voltage, the control circuit can control the second-stage circuit 12 and the first-stage circuit 11 to adjust the voltage input to the low-voltage port in turn, that is, perform voltage adjustment twice, and then output the adjusted voltage from the high-voltage port.

[0130] In the second-stage circuit 12 , the switches M1 , M2 , M3 , and M4 serve as active transistors; the switches M5 and M6 serve as directional transistors, which can adjust the polarity of the output voltage of the low-voltage port.

[0131] When the second-stage circuit 12 regulates the output voltage of the first-stage circuit 11, energy in the regulation circuit 10 flows in the forward direction, the switch tubes M1 and M3 are turned on, and the switch tubes M2 and M4 are turned off; if the switch tube M6 is turned on, the currents in the first inductor L1 and the second inductor L2 flow from the first-stage circuit 11 to the low-voltage port, and the voltage across the first capacitor C1 is the first polarity; if the switch tube M5 is turned on, the currents in the first inductor L1 and the second inductor L2 flow from the low-voltage port to the first-stage circuit 11, and the voltage across the first capacitor C1 is the second polarity.

[0132] When the second-stage circuit 12 regulates the voltage input to the low-voltage port, the energy of the regulation circuit 10 flows in the reverse direction, the switch tubes M1 and M3 are turned off, and the switch tubes M2 and M4 are turned on; if the switch tube M6 is turned on, the currents in the first inductor L1 and the second inductor L2 flow from the low-voltage port to the first-stage circuit 11, and the voltage across the first capacitor C1 is the first polarity; if the switch tube M5 is turned on, the currents in the first inductor L1 and the second inductor L2 flow from the first-stage circuit 11 to the low-voltage port, and the voltage across the first capacitor C1 is the second polarity.

[0133] In the above embodiment, the control circuit can control the regulating circuit to perform two voltage adjustments, and realize a four-quadrant power supply with high efficiency in bidirectional energy flow.

[0134] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0135] The embodiments described above only express several implementation methods of the present application, which are convenient for understanding the technical solutions of the present application in a specific and detailed manner, but they cannot be understood as limiting the scope of protection of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several variations and improvements can be made, which all fall within the scope of protection of the present application. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided in the present application are all within the scope of protection of the attached claims described in the present application. Therefore, the scope of protection of the patent of this application shall be based on the content of the attached claims, and the description and drawings can be used to interpret the content of the claims.

Claims

1. A regulating circuit, characterized in that: The regulating circuit includes a first-stage circuit and a second-stage circuit; the first-stage circuit includes a high-voltage port, the second-stage circuit includes a low-voltage port, and the first-stage circuit is connected to the second-stage circuit; The first-stage circuit and the second-stage circuit are used to adjust the voltage input to the high-voltage port and output it from the low-voltage port, or to adjust the voltage input to the low-voltage port and output it from the high-voltage port; Wherein, the second stage circuit includes a first inductor circuit and a second inductor circuit, and the first inductor circuit and the second inductor circuit are connected in parallel; The first inductor circuit and the second inductor circuit are both used to adjust the output voltage of the first-stage circuit or the voltage input to the low-voltage port; The first inductor circuit includes a first switching circuit and a first inductor, and the second inductor circuit includes a second switching circuit and a second inductor; the first switching circuit is connected to the first stage circuit and the first inductor respectively, and the second switching circuit is connected to the first stage circuit and the second inductor respectively, and a common end of the first inductor and the second inductor is connected to the low-voltage port; The first stage circuit includes a first voltage conversion circuit and a second voltage conversion circuit; the first voltage conversion circuit and the second voltage conversion circuit are connected in series on a side close to the high-voltage port, and are connected in parallel on a side close to the second stage circuit; The first voltage conversion circuit and the second voltage conversion circuit are both used to adjust the voltage input to the high-voltage port or the output voltage of the second-stage circuit.

2. The regulating circuit according to claim 1, characterized in that: The first switch circuit is configured to conduct a path between the first-stage circuit and the first inductor under the control of a control circuit external to the regulating circuit; The second switch circuit is used to conduct the path between the first-stage circuit and the second inductor under the control of the control circuit outside the regulating circuit.

3. The regulating circuit according to claim 2, characterized in that: There is a phase difference between the driving signal of the first switching circuit and the driving signal of the second switching circuit.

4. The regulating circuit according to claim 2, characterized in that: The second stage circuit further includes a first capacitor and a polarity adjustment circuit; A first end of the first capacitor is connected to a common end of the first inductor and the second inductor, and a second end of the first capacitor is connected to the polarity adjustment circuit; The polarity adjustment circuit is used to adjust the polarity of the output voltage of the low-voltage port.

5. The regulating circuit according to claim 1, wherein: The first voltage conversion circuit includes a first primary circuit, a first resonant circuit, and a first secondary circuit connected in sequence; the first primary circuit is also connected to the high-voltage port, and the first secondary circuit is also connected to the second-stage circuit; The second voltage transformation circuit includes a second primary circuit, a second resonant circuit and a second secondary circuit connected in sequence; the second primary circuit is also connected to the high-voltage port, and the second secondary circuit is also connected to the second stage circuit.

6. The regulating circuit according to claim 5, characterized in that: There is a phase difference between the driving signal of the first voltage conversion circuit and the driving signal of the second voltage conversion circuit.

7. The regulating circuit according to claim 1, characterized in that: The first stage circuit further includes a second capacitor and a third capacitor connected in series; The first end of the second capacitor is connected to the common end of the high-voltage port and the first transformer circuit; the common end of the second capacitor and the third capacitor is connected to the first transformer circuit and the second transformer circuit respectively; the first end of the third capacitor is connected to the high-voltage port.

8. An energy storage system, characterized in that: The energy storage system comprises a control circuit, a plurality of parallel battery clusters and at least one regulating circuit according to any one of claims 1 to 7; The high-voltage port of the regulating circuit is connected in parallel with the corresponding connected battery cluster, and the low-voltage port of the regulating circuit is connected in series with the corresponding connected battery cluster; The control circuit is used to control the regulation circuit to perform voltage regulation.

9. A control method for a regulating circuit, characterized in that: Applied to the regulating circuit according to any one of claims 1 to 7, the method comprises: Controlling the first-stage circuit and the second-stage circuit of the regulating circuit to regulate the voltage inputted from the high-voltage port and then output it from the low-voltage port; Alternatively, the first stage circuit and the second stage circuit are controlled to adjust the voltage input to the low voltage port and then output it from the high voltage port.

10. The method according to claim 9, characterized in that The second-stage circuit includes a first inductor circuit and a second inductor circuit, and the method further includes: The first inductance circuit and the second inductance circuit are controlled to adjust the output voltage of the first stage circuit or the voltage input to the low-voltage port.

11. The method according to claim 9 or 10, characterized in that The first-stage circuit includes a first voltage conversion circuit and a second voltage conversion circuit, and the method further includes: The first voltage conversion circuit and the second voltage conversion circuit are controlled to adjust the voltage input to the high-voltage port or the output voltage of the second-stage circuit.

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