Protection method and circuit for energy storage power supply

Abstract

The invention provides a protection method and circuit for an energy storage power supply, and the method comprises the steps: the provided energy storage power supply comprises a plurality of miniature power units and a load unit, the plurality of miniature power units are cascaded, and the output is controlled through a plurality of drive switches and a plurality of inverter switches in the miniature power units; monitoring the micro power unit and the load unit to obtain power supply operation information and load operation information; and if the power supply operation information or the load operation information is abnormal, switching off the driving switch in the working state in the micro power unit and the inverter switch in the working state in each micro power unit. According to the invention, the operation states of the power supply end and the load end in the energy storage power supply are monitored, and when one end is abnormal, corresponding emergency braking measures are taken quickly, so that other miniature power units are prevented from being damaged when a certain miniature power unit or load unit has overvoltage, overcurrent and other faults, the overall safety of the energy storage power supply is improved, and the safety of the energy storage power supply is improved. The service life of the energy storage power supply is ensured.

Description

Technical Field

[0001] The present invention relates to the field of power supplies, and in particular to a protection method and circuit for an energy storage power supply. Background Art

[0002] With the development of new energy technologies, energy storage power supplies have gradually entered people's lives and production, becoming an indispensable part of production and life. With the rapid development of energy storage power supplies and the expansion of their application scenarios, energy storage power supplies have become a need to meet people's needs in various working scenarios with different DC voltage levels. This requires energy storage power supplies to have convenient and modular characteristics. At the same time, because they need to adapt to the voltage levels of various different electrical equipment, they need to have good scalability and flexible adaptation to different voltage levels. While matching various needs, modular energy storage power supplies require each micro power unit to have a good startup and protection strategy to prevent the energy storage power supply and industrial equipment from being damaged by overvoltage, overcurrent, short circuit and other faults during use. While meeting the driving of industrial equipment, it can normally protect each micro power unit in the energy storage power supply, minimize damage to the energy storage power supply, increase the service life of the energy storage power supply, and reduce the use risk caused by failures.

[0003] In the related art, although there are methods for protecting energy storage power supplies, the protection of the energy storage power supply can only realize the detection of the power supply. The protection circuit cannot make corresponding changes to the energy storage power supply according to the load requirements, nor can it perform real-time detection and abnormal processing of the charging circuit during charging.

[0004] Therefore, how to provide a method for providing an energy storage power supply that can change according to load demand and can provide real-time protection is a technical problem that urgently needs to be solved. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a protection method and circuit for an energy storage power supply to solve the above-mentioned technical problems.

[0006] In order to achieve the above-mentioned purpose and other related purposes, the technical solution provided by this application is as follows.

[0007] In a first aspect, the present application provides a protection method for an energy storage power supply, which is applied to a protection circuit of an energy storage power supply, wherein the protection circuit comprises an energy storage power supply, a plurality of control units and a main controller, wherein the energy storage power supply comprises a plurality of micro power units and a load unit, wherein the main controller is respectively connected to each control unit, each micro power unit and the load unit, wherein the plurality of control units are connected to the plurality of micro power units in a one-to-one correspondence, wherein the plurality of micro power units are cascaded in sequence, wherein the first micro power unit and the last micro power unit are connected to the load unit circuit, wherein each micro power unit controls the output through a plurality of drive switches and a plurality of inverter switches, wherein the method comprises: When the energy storage power source is in a discharging state, each micro power unit and the load unit are monitored to obtain a plurality of power source operation information and load operation information; If any of the power supply operation information or the load operation information is abnormal, disconnecting the driving switch, multiple inverter switches and the discharge switch in the load unit working in the corresponding micro power unit; If the power supply operation information and the load operation information return to normal, the main controller closes a plurality of inverter switches and a drive switch in the micro power unit and a discharge switch in the load unit; The power supply operation information includes sampled voltage, sampled current and battery temperature, and the load operation information includes load voltage and load current.

[0008] In one embodiment of the present application, if any one of the power supply operation information or the load operation information is abnormal, the driving switch, multiple inverter switches and the discharge switch working in the corresponding micro power unit are disconnected, including: if any one of the power supply operation information is abnormal, the corresponding driving switch is disconnected first, and then the multiple inverter switches and the discharge switch are disconnected; if the load operation information is abnormal, the multiple inverter switches and the discharge switch are disconnected first, and then the driving switch is disconnected.

[0009] In one embodiment of the present application, if any one of the power supply operation information is abnormal, the corresponding drive switch is disconnected first, and then the multiple inverter switches and the discharge switch are disconnected, including: the control unit disconnects the drive switch in the working state in the micro power unit based on the power supply operation information; the control unit generates a power supply fault signal based on the power supply operation information, and sends the power supply fault signal to the main controller; the main controller responds to the power supply fault signal, and disconnects the multiple inverter switches and the discharge switch, and turns off the energy storage power supply.

[0010] In one embodiment of the present application, if the load operation information is abnormal, the plurality of inverter switches and the discharge switch are disconnected first, and then the drive switch is disconnected, including: the main controller disconnects the plurality of inverter switches and the discharge switch; the main controller generates a load fault signal according to the load operation information, and sends the load fault signal to each control unit; each control unit responds to the load fault signal, and disconnects the drive switches in working state in the plurality of micro power units, and turns off the energy storage power supply.

[0011] In one embodiment of the present application, if the power supply operation information and the load operation information return to normal, the main controller closes multiple inverter switches, drive switches of the micro power unit and the discharge switch in the load unit, including: the main controller obtains the discharge demand of the energy storage power supply and sets the multiple inverter switches and the discharge switches to a working state according to the discharge demand, and sends an enable signal to each control unit; each control unit responds to the enable signal and sets each drive switch to a working state according to the enable signal.

[0012] In one embodiment of the present application, the energy storage power supply also includes a charging unit, and the first micro power unit and the last micro power unit are connected to the charging unit circuit. The method also includes: when the energy storage power supply is in a charging state, monitoring each micro power unit and the charging unit to obtain a plurality of power supply operation information and charging operation information; if any of the power supply operation information or the charging operation information is abnormal, disconnecting the driving switch, multiple inverter switches and the charging switch working in the corresponding micro power unit and the charging unit; if the power supply operation information and the charging operation information return to normal, the main controller closes the multiple inverter switches, the driving switch and the charging switch in the micro power unit and the charging unit; wherein the charging operation information includes the charging voltage and the charging current.

[0013] In one embodiment of the present application, if any one of the power supply operation information or the charging operation information is abnormal, the driving switch, multiple inverter switches and the charging switch working in the corresponding micro power unit are disconnected, including: if any one of the power supply operation information is abnormal, the driving switch is disconnected first, and then the multiple inverter switches and the charging switch are disconnected; if the charging operation information is abnormal, the charging switch and the multiple inverter switches are disconnected first, and then the driving switch is disconnected.

[0014] In one embodiment of the present application, if the power supply operation information and the charging operation information return to normal, the main controller closes multiple inverter switches, drive switches in the micro power unit and the charging switch in the charging unit; the main controller obtains the charging demand of the energy storage power supply and sets the multiple inverter switches and the charging switches to a working state according to the charging demand, and sends an enable signal to each control unit; each control unit responds to the enable signal and sets each drive switch to a working state according to the enable signal.

[0015] In a second aspect, the present application also provides a protection circuit for an energy storage power supply, comprising: A plurality of micro power units are used to superimpose the output voltage of each power supply to obtain the total power supply output voltage, and perform inversion processing through the micro power units to obtain the power supply output voltage; A load unit, used for filtering the total voltage output by the power supply to obtain a load driving voltage, and applying the load driving voltage to a load device; A charging unit, used to charge the power supply in the micro power unit when the power supply output voltage meets a preset low voltage threshold; Multiple control units, used to sample voltage, current and temperature of corresponding micro power units to obtain multiple power supply operation information; A main controller, used for sampling the voltage and current of the load unit and the charging unit to obtain load operation information and charging operation information; When the control unit determines that any one of the power supply operation information is abnormal, the driving switch in the corresponding micro power unit in working state is first disconnected, and then the plurality of the inverter switches and the discharge switch or the charging switch in working state are disconnected through the main controller; When the main controller determines that the load operation information is abnormal, the main controller first disconnects the plurality of inverter switches and the discharge switches, and then disconnects the driving switches in the plurality of micro power units that are in working state through the plurality of control units; When the main controller determines that the charging operation information is abnormal, the main controller first disconnects the plurality of inverter switches and the charging switches, and then disconnects the driving switches in the plurality of micro power units that are in working state through the plurality of control units; The power supply operation information, the load operation information and the charging operation information of the energy storage power supply are restored from an abnormal state, and the main controller controls the energy storage power supply to restore the working state before the abnormality; The power supply operation information includes a sampled voltage, a sampled current and a battery temperature, the load operation information includes a load voltage and a load current, and the charging operation information includes a charging voltage and a charging current.

[0016] In another embodiment of the present application, the micro power unit includes a charging and discharging electronic unit and an inverter unit, the charging and discharging electronic unit is connected to the inverter unit, the charging and discharging electronic unit is connected to the control unit, and the inverter unit is connected to the main controller.

[0017] In another embodiment of the present application, if the control unit determines that any one of the power supply operation information is abnormal, the driving switch in the corresponding micro power unit in working state is first disconnected, and then the plurality of the inverter switches and the discharge switch or the charging switch in working state are disconnected through the main controller, including: the control unit disconnects the driving switch in the corresponding charging and discharging electronic unit in working state, and generates a power supply fault signal according to the power supply operation information, and sends the power supply fault signal to the main controller, the main controller responds to the power supply fault signal, and disconnects the inverter switch working in each inverter sub-unit, the discharge switch working in the load unit, or the charging switch working in the charging unit.

[0018] In another embodiment of the present application, the main controller determines that the load operation information is abnormal, and then first disconnects the plurality of inverter switches and the discharge switches through the main controller, and then disconnects the driving switches in the plurality of micro power units that are in working state through the plurality of control units, including: the main controller disconnects the inverter switch in each inverter sub-unit and the discharge switch in the load unit, and generates a load fault signal according to the load operation information, and sends the load fault signal to each control unit, each control unit responds to the load fault signal, and disconnects the driving switch working in each charging and discharging electronic unit.

[0019] In another embodiment of the present application, the main controller determines that the charging operation information is abnormal, and then first disconnects the plurality of inverter switches and the charging switches through the main controller, and then disconnects the driving switches in the plurality of micro power units that are in working state through the plurality of control units, including: the main controller disconnects the inverter switch in each inverter sub-unit and the charging switch in the charging unit, and generates a charging fault signal according to the charging operation information, and sends the charging fault signal to each control unit, and each control unit responds to the charging fault signal and disconnects the driving switch working in each charging and discharging electronic unit.

[0020] The present application provides a protection method and circuit for an energy storage power supply, the method comprising: the energy storage power supply provided comprises a plurality of micro power units and load units, the plurality of micro power units are cascaded, and the output is controlled by a plurality of drive switches and a plurality of inverter switches in the micro power units; the micro power units and load units are monitored to obtain power supply operation information and load operation information; if the power supply operation information or the load operation information is abnormal, the drive switch in the micro power unit that is in a working state and the inverter switch in each micro power unit that is in a working state are disconnected. The present application monitors the operating state of the power supply end and the load end in the energy storage power supply, and when an abnormality occurs at one end, corresponding emergency braking measures are quickly taken to avoid damage to other micro power units when a micro power unit or load unit has an overvoltage, overcurrent or other fault, thereby improving the overall safety of the energy storage power supply and ensuring the service life of the energy storage power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present invention, and together with the specification, are used to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings: Figure 1 A flow chart of a method for protecting a discharge of an energy storage power supply shown as an exemplary embodiment of the present invention; Figure 2 A block diagram of a protection circuit for an energy storage power supply according to an exemplary embodiment of the present invention; Figure 3 A schematic diagram of an energy storage power supply shown as an exemplary embodiment of the present invention; Figure 4 A specific structural diagram of a micro power unit shown as an exemplary embodiment of the present invention; Figure 5 A control diagram of a single micro power unit is shown for an exemplary embodiment of the present invention; Figure 6 A flowchart of a method for protecting energy storage power supply charging shown as an exemplary embodiment of the present invention; Figure 7 A block diagram of a protection circuit for an energy storage power supply according to an exemplary embodiment of the present invention; Figure 8 A schematic diagram of a protection circuit for an energy storage power supply according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0023] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0024] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0025] CAN communication is a serial communication protocol bus used for real-time applications. It belongs to the category of field bus and is mainly used for data communication in distributed control systems.

[0026] The inventors have found that with the development of new energy technologies, energy storage power supplies have gradually entered people's lives and production, becoming an indispensable part of production and life. With the rapid development of energy storage power supplies and the expansion of their application scenarios, energy storage power supplies have become a need to meet people's needs in various working scenarios with different DC voltage levels. This requires the energy storage power supply to have convenient and modular characteristics. At the same time, because it needs to adapt to the voltage levels of various different electrical equipment, it is required to have good scalability and flexible adaptation to different voltage levels. While matching various needs, the modular energy storage power supply requires each micro power unit to have a good startup and protection strategy to prevent the energy storage power supply from being damaged by overvoltage, overcurrent, short circuit and other faults during use. The energy storage power supply and industrial equipment can be protected normally while meeting the driving of industrial equipment. The damage to the energy storage power supply is minimized, the service life of the energy storage power supply is increased, and the use risk caused by failures is reduced.

[0027] In the related art, although there are methods for protecting energy storage power supplies, the protection of the energy storage power supplies can only realize the detection of the power supply. The protection circuit cannot make corresponding changes to the energy storage power supply according to the load requirements, nor can it detect the charging circuit and handle abnormalities during charging.

[0028] See also Figure 1 , Figure 1 The present invention is a flowchart of a method for protecting a discharge of an energy storage power supply according to an exemplary embodiment of the present invention.

[0029] like Figure 1 As shown, the present application provides a protection method for an energy storage power supply, which is applied to a protection circuit of an energy storage power supply, wherein the protection circuit includes an energy storage power supply, a plurality of control units and a main controller, wherein the energy storage power supply includes a plurality of micro power units and a load unit, wherein the main controller is connected to each control unit, each micro power unit and the load unit respectively, wherein the plurality of control units are connected to the plurality of micro power units in a one-to-one correspondence, wherein the plurality of micro power units are cascaded in sequence, wherein the first micro power unit and the last micro power unit are connected to the load unit circuit, wherein each micro power unit controls the output through a plurality of drive switches and a plurality of inverter switches, and wherein the method at least includes steps S110 to S130, which are described in detail as follows: S110, when the energy storage power source is in a discharging state, monitoring each micro power unit and load unit to obtain a plurality of power source operation information and load operation information; S120, if any power supply operation information or load operation information is abnormal, disconnect the driving switch, multiple inverter switches and the discharge switch in the corresponding micro power unit; S130, if the power supply operation information and the load operation information return to normal, the main controller closes the multiple inverter switches and the drive switch in the micro power unit and the discharge switch in the load unit; The power supply operation information includes the sampled voltage, sampled current and battery temperature, and the load operation information includes the load voltage and load current.

[0030] If the power supply operation information or the load operation information is always abnormal, the energy storage power supply is always in the off state.

[0031] See also Figure 2 , Figure 2 The block diagram of a protection circuit of an energy storage power supply is shown as an exemplary embodiment of the present invention.

[0032] See also Figure 3 , Figure 3 A schematic diagram of an energy storage power supply is shown as an exemplary embodiment of the present invention.

[0033] Specifically, Figure 2As shown, the protection circuit of the energy storage power supply includes an energy storage power supply, multiple control units and a main controller. The energy storage power supply includes multiple micro power units, load units and charging units. The main controller is connected to each control unit, each micro power unit, load unit and charging unit respectively. The multiple control units are connected to the multiple micro power units in a one-to-one correspondence. Figure 3 As shown, multiple micro power units are cascaded in sequence, the first input and output terminals of the first micro power unit are connected to the first input terminal of the load unit, the first input and output terminals of the first micro power unit are also connected to the first output terminal of the charging unit, the second input and output terminals of the first micro power unit are connected to the first input and output terminals of the second micro power unit, the second input and output terminals of the i-th micro power unit are connected to the first input and output terminals of the i+1-th micro power unit, the second input and output terminals of the last micro power unit are connected to the second input terminal of the load unit, and the second input and output terminals of the last micro power unit are also connected to the second output terminal of the charging unit, the total output voltage of the power supply is obtained by cascading multiple micro power units, the load unit filters the total output voltage of the power supply to obtain a load driving voltage, and the load driving voltage is applied to the load, wherein i is an integer, 1≤i≤n, n is the number of control units, n≥1.

[0034] like Figure 3 As shown, the load unit includes a first filter inductor L1, a first filter capacitor C2, a load resistor RL, a first discharge switch K11 and a second discharge switch K12. One end of the first filter inductor L1 is connected to one end of the first filter capacitor C2, and one end of the first filter inductor L1 is also connected to one end of the load resistor RL via the first discharge switch K11. The other end of the first filter capacitor C2 is connected to the other end of the load resistor RL via the second discharge switch K12. The other end of the first filter inductor L1 is the first input end of the load unit, and the other end of the first filter capacitor C2 is the second input end of the load unit.

[0035] like Figure 3As shown, the charging unit includes a second filter inductor L2, a second filter capacitor C3, a first charging resistor Rc1, a second charging resistor Rc2, a first pre-charge control switch K21, a second pre-charge control switch K22, a first charging switch K31 and a second charging switch K32, one end of the second filter inductor L2 is connected to one end of the second filter capacitor C3, one end of the second filter capacitor C3 is connected to the positive electrode of the power grid Grid via the first charging resistor Rc1 and the first pre-charge control switch K21, one end of the second filter capacitor C3 is also connected to the positive electrode of the power grid Grid via the first charging switch K31, the other end of the second filter capacitor C3 is connected to the negative electrode of the power grid Grid via the second charging resistor Rc2 and the second pre-charge control switch K22, the other end of the second filter capacitor C3 is also connected to the negative electrode of the power grid Grid via the second charging switch K32, wherein the other end of the second filter inductor L2 is the first output end of the charging unit, and the other end of the second filter capacitor C3 is the second output end of the charging unit.

[0036] It should be explained that the discharge switch includes a first discharge switch K11 and a second discharge switch K12, and the charge switch includes a first pre-charge control switch K21, a second pre-charge control switch K22, a first charge switch K31 and a second charge switch K32.

[0037] See also Figure 4 , Figure 4 This is a detailed structural diagram of a micro power unit according to an exemplary embodiment of the present invention.

[0038] like Figure 4 As shown, Figure 4 As shown, the micro power unit includes a charging and discharging electronic unit and an inverter unit. The charging and discharging electronic unit includes a battery pack Vbat, a fuse F, a first resistor R1, a second resistor R2, a first drive switch Q1, a second drive switch Q2 and a first capacitor C1. One end of the first resistor R1 is connected to the negative electrode of the battery pack Vbat, the other end of the first resistor R1 is connected to one end of the first capacitor C1, one end of the first drive switch Q1 is connected to the positive electrode of the resistor group Vbat through the fuse F, the other end of the first drive switch Q1 is connected to the other end of the first capacitor C1, one end of the second resistor R2 is connected to one end of the first drive switch Q1, the other end of the second resistor R2 is connected to one end of the second drive switch Q2, and the other end of the second drive switch Q2 is connected to the other end of the first drive switch Q1.

[0039] like Figure 4As shown, the inverter subunit includes a first inverter switch S1, a second inverter switch S2, a third inverter switch S3, and a fourth inverter switch S4. One end of the first inverter switch S1 is connected to one end of the second inverter switch S2, the other end of the first inverter switch S1 is connected to one end of the third inverter switch S3, the other end of the third inverter switch S3 is connected to the other end of the fourth inverter switch S4, the other end of the second inverter switch S2 is connected to one end of the fourth inverter switch S4, one end of the first inverter switch S1 is connected to the other end of the first capacitor C1, the other end of the third inverter switch S3 is connected to one end of the first capacitor C1, the other end of the first inverter switch S1 is the first input and output end of the inverter subunit, the first input and output end of the inverter subunit is the first input and output end of the micro power unit, one end of the fourth inverter switch S4 is the second input and output end of the inverter subunit, and the second input and output end of the inverter subunit is the second input and output end of the micro power unit. It should be noted that the pre-charging branch composed of the second resistor R2 and the second drive switch Q2 may only include the second resistor R2. When the micro power unit is working normally, the second drive switch Q2 is closed first, and the battery pack Vbat pre-charges the first capacitor C1. Then the second drive switch Q2 is disconnected, and the first drive switch Q1 is closed, and the battery pack Vbat charges the first capacitor C1.

[0040] See also Figure 5 , Figure 5 A control diagram of a single micro power unit is shown for an exemplary embodiment of the present invention.

[0041] like Figure 5 As shown, the voltage, current and temperature of the micro power unit are sampled to obtain the power supply operation information, including: the voltage, current and temperature of the battery pack Vbat are sampled by the control unit to obtain the battery voltage, battery current and battery temperature; the voltage across the first drive switch Q1 is sampled by the control unit to obtain the drive voltage, the current of the first resistor R1 is sampled by the control unit to obtain the working current of the charge and discharge electronic unit, and the voltage across the first capacitor C1 is sampled by the control unit to obtain the charging voltage. The power supply operation information includes the sampled voltage, sampled current and sampled temperature. The sampled voltage includes the battery voltage, drive voltage and charging voltage, etc. The sampled current includes the battery current, charging current, etc. The sampled temperature is the battery temperature.

[0042] like Figure 5 As shown, the main controller samples the voltage and current of the first filter inductor L1, the first filter capacitor C2 and the load resistor RL of the load unit to obtain load operation information. The load operation information includes the voltage of the first filter inductor L1, the current of the first filter inductor L1, the voltage of the first filter capacitor C2, the current of the first filter capacitor C2, the current of the load resistor RL, the voltage of the load resistor RL, etc.

[0043] In one embodiment of the present application, if any power supply operation information or load operation information is abnormal, the driving switch, multiple inverter switches and the discharge switch working in the corresponding micro power unit are disconnected, including: if any power supply operation information is abnormal, the corresponding driving switch is disconnected first, and then the multiple inverter switches and the discharge switch are disconnected; if the load operation information is abnormal, the multiple inverter switches and the discharge switch are disconnected first, and then the driving switch is disconnected. Specifically, when any power supply operation information is abnormal, the driving switch in the corresponding micro power unit that is in a working state is disconnected first, and then the multiple inverter switches and the discharge switch are disconnected. For example, Figure 5 As shown, when the sampling voltage, sampling current or sampling temperature of one of the multiple micro power units is abnormal, the driving switch (Q1 or Q2) in the abnormal micro power unit in working state is disconnected first, and then the inverter switch (S1, S2, S3, S4) and the discharge switch (K11, K12) in working state are disconnected. When the load operation information is abnormal, it will cause the load unit to be overloaded. If the overload time is too long, the energy storage power supply will be damaged. Therefore, the inverter switch (S1, S2, S3, S4) and the discharge switch (K11, K12) in working state are disconnected first, and then the driving switch (Q1 or Q2) in working state in the micro power unit is disconnected.

[0044] In one embodiment of the present application, if any power supply operation information is abnormal, the corresponding drive switch is disconnected first, and then multiple inverter switches and discharge switches are disconnected, including: the control unit disconnects the drive switch in the working state in the micro power unit based on the power supply operation information; the control unit generates a power supply fault signal based on the power supply operation information, and sends the power supply fault signal to the main controller; the main controller responds to the power supply fault signal, and disconnects multiple inverter switches and discharge switches to turn off the energy storage power supply. Figure 5As shown, the control unit collects information from the micro power unit to obtain power operation information, the control unit judges the collected power operation information one by one, and calculates the charge of the corresponding battery according to the battery current and the collection time. When at least one of the power operation information is abnormal, the control unit disconnects the driving switch (Q1 or Q2) in the charging and discharging electronic unit that is in a working state, and the control unit generates a power fault signal F_VCC according to the power operation information, and sends the collected power operation information and the power fault signal F_VCC to the main controller through CAN communication (Controller Area Network); the main controller receives and responds to the power fault signal F_VCC, and performs level conversion on the inverter drive signal and the discharge drive signal according to the power fault signal F_VCC, applies the inverter drive signal to each inverter sub-unit, disconnects the inverter switch (S1, S2, S3, S4) in the working state in each inverter sub-unit, and applies the inverter drive signal to the discharge switch (K11, K22) in the working state in the charging unit to shut down the energy storage power supply.

[0045] In one embodiment of the present application, if the load operation information is abnormal, multiple inverter switches and discharge switches are disconnected first, and then the drive switch is disconnected, including: the main controller disconnects multiple inverter switches and discharge switches; the main controller generates a load fault signal according to the load operation information, and sends the load fault signal to each control unit; each control unit responds to the load fault signal, and disconnects the drive switches in the working state in multiple micro power units, and shuts down the energy storage power supply. Figure 5 As shown, when the main controller determines that the collected load operation information is abnormal, the main controller first converts the level of the inverter drive signal and the discharge drive signal according to the load operation information, applies the inverter drive signal to each inverter sub-unit, and disconnects the inverter switch (S1, S2, S3, S4) in the working state in each inverter sub-unit. At the same time, the inverter drive signal is applied to the discharge switch (K11, K22) in the charging unit that is in the working state; then, a load fault signal F_L is generated according to the load operation information, and the collected load operation information and the load fault signal F_L are transmitted to each control unit through CAN communication (Controller Area Network). The control unit receives and responds to the load fault signal F_L, converts the level of the drive signal according to the load fault signal F_L, and disconnects the drive switch (Q1 or Q2) in the working state in each charging and discharging electronic unit.

[0046] In one embodiment of the present application, if the power supply operation information and the load operation information return to normal, the main controller closes multiple inverter switches, drive switches of the micro power unit and the discharge switch in the load unit, including: the main controller obtains the discharge demand of the energy storage power supply and sets the multiple inverter switches and discharge switches to the working state according to the discharge demand, and sends an enable signal to each control unit; each control unit responds to the enable signal and sets each drive switch to the working state according to the enable signal. Specifically, when the staff has completed clearing the fault, the power supply operation information and the load operation information change from abnormal to normal, the main controller obtains the discharge demand of the energy storage power supply, and converts the inverter drive signal and the discharge drive signal level according to the discharge demand, so that multiple inverter switches (S1, S2, S3, S4) and discharge switches (K11, K22) are set to the working state, and an enable signal EN is generated for each control unit. Each control unit receives and responds to the enable signal EN, and first closes the second drive switch Q2 according to the enable signal EN, and charges the first capacitor C1 through the pre-charging circuit. After the voltage of the first capacitor C1 is stable, the second drive switch Q2 is disconnected, and the first drive switch Q1 is closed, and the battery pack Vbat is connected to the energy storage power supply to power the load equipment.

[0047] When the power level of the energy storage power supply is lower than the preset low voltage threshold, the energy storage power supply needs to be charged, and the charging process of the energy storage power supply also needs to be protected.

[0048] like Figure 6 As shown, the energy storage power supply protection method further includes steps S610 to S630: S610, when the energy storage power source is in a charging state, monitoring each micro power unit and charging unit to obtain a plurality of power supply operation information and charging operation information; S620: If any power supply operation information or charging operation information is abnormal, disconnect the driving switch, multiple inverter switches and charging switch in the corresponding micro power unit; S630: If the power supply operation information and the charging operation information return to normal, the main controller closes the multiple inverter switches and the drive switch in the micro power unit and the charging switch in the charging unit; The charging operation information includes charging voltage and charging current.

[0049] like Figure 5 As shown, the main controller samples the voltage and current of the second filter inductor L2, the second filter capacitor C3 and the charging resistors (Rc1, Rc2) of the charging unit to obtain charging operation information. The charging operation information includes the voltage and current of the second filter inductor L2, the voltage and current of the second filter capacitor C3, the current and voltage of the charging resistors (Rc1, Rc2), etc.

[0050] In one embodiment of the present application, if any power supply operation information or charging operation information is abnormal, the driving switch, multiple inverter switches and charging switch working in the corresponding micro power unit are disconnected, including: if any power supply operation information is abnormal, the driving switch is disconnected first, and then the multiple inverter switches and charging switch are disconnected; if the charging operation information is abnormal, the charging switch and multiple inverter switches are disconnected first, and then the driving switch is disconnected. For example, Figure 5 As shown, when the sampling voltage, sampling current or sampling temperature of one of the multiple micro power units is abnormal, the driving switch (Q1 or Q2) in the abnormal micro power unit in working state is disconnected first, and then the inverter switch (S1, S2, S3, S4) and charging switch (K21, K22, K31, K32) in working state are disconnected. When the charging operation information is abnormal, the charging current and voltage are abnormal, which will reduce the life of the battery. Therefore, the inverter switch (S1, S2, S3, S4) and charging switch (K21, K22, K31, K32) in working state are disconnected first, and then the driving switch (Q1 or Q2) in working state in the micro power unit is disconnected.

[0051] In one embodiment of the present application, if the power supply operation information and the charging operation information return to normal, the main controller closes multiple inverter switches, drive switches in the micro power unit and the charging switch in the charging unit; the main controller obtains the charging demand of the energy storage power supply and sets the multiple inverter switches and charging switches to the working state according to the charging demand, and sends an enable signal to each control unit; each control unit responds to the enable signal and sets each drive switch to the working state according to the enable signal. Specifically, after the staff has resolved the abnormal alarm, the power supply operation information and the charging operation information are changed from abnormal to normal, the main controller obtains the charging demand of the energy storage power supply, and converts the inverter drive signal and the charging drive signal level according to the charging demand, so that multiple inverter switches (S1, S2, S3, S4) and charging switches (K21, K22, K31, K32) are set to the working state, and the charging switch is controlled to first close the pre-charge control switch (K21, K22), and after the voltage of the second filter capacitor C3 is stable, the pre-charge control switch (K21, K22) is disconnected, and then the charging switch (K31, K32) is closed; and an enable signal EN is generated for each control unit, each control unit receives and responds to the enable signal EN, and closes the drive switch (Q1 or Q2) according to the enable signal EN, and charges the energy storage power supply through the power grid Grid.

[0052] It should be emphasized that the sequential control principle of the driving switch (Q1 or Q2), the inverter switch (S1, S2, S3, S4) and the charging switch (K21, K22, K31, K32) during the charging process is the same as the control principle during the discharging process, and will not be repeated here.

[0053] See also Figure 7 , a block diagram of a protection circuit for an energy storage power supply is shown according to an exemplary embodiment of the present invention.

[0054] like Figure 7 As shown, the present application also provides a protection circuit for an energy storage power supply, including: A plurality of micro power units are used to superimpose the output voltage of each power supply to obtain the total output voltage of the power supply, and perform inversion processing through the micro power units to obtain the output voltage of the power supply; The load unit is used to filter the total voltage output by the power supply to obtain a load driving voltage, and apply the load driving voltage to the load device; A charging unit, used to charge the power supply in the micro power unit when the power supply output voltage meets a preset low voltage threshold; Multiple control units, used to sample voltage, current and temperature of corresponding micro power units to obtain multiple power supply operation information; The main controller is used to sample the voltage and current of the load unit and the charging unit to obtain the load operation information and the charging operation information; If the control unit determines that any power supply operation information is abnormal, the driving switch (Q1 or Q2) in the corresponding micro power unit that is in working state is disconnected first, and then the main controller disconnects multiple inverter switches (S1, S2, S3, S4) and the discharge switch (K11, K12) or charging switch (K21, K22, K31, K32) in working state; When the main controller determines that the load operation information is abnormal, it first disconnects multiple inverter switches (S1, S2, S3, S4) and discharge switches (K11, K12) through the main controller, and then disconnects the driving switches (Q1 or Q2) in the working state in multiple micro power units through multiple control units; When the main controller determines that the charging operation information is abnormal, the main controller first disconnects multiple inverter switches (S1, S2, S3, S4) and charging switches (K21, K22, K31, K32), and then disconnects the driving switches (Q1 or Q2) in the working state in the multiple micro power units through multiple control units; The power supply operation information, load operation information and charging operation information of the energy storage power supply are restored from an abnormal state, and the controller controls the energy storage power supply to restore the working state before the abnormality; Among them, the power operation information includes the sampled voltage, sampled current and battery temperature, the load operation information includes the load voltage and load current, and the charging operation information includes the charging voltage and charging current.

[0055] In another embodiment of the present application, the micro power unit includes a charging and discharging electronic unit and an inverter unit, the charging and discharging electronic unit is connected to the inverter unit, the charging and discharging electronic unit is connected to the control unit, and the inverter unit is connected to the main controller. Figure 5 As shown, the micro power unit includes a charging and discharging electronic unit and an inverter subunit, the charging and discharging electronic unit is connected to the inverter subunit, the charging and discharging electronic unit is connected to the control unit, and the inverter subunit is connected to the main controller.

[0056] See also Figure 8 , Figure 8 A schematic diagram of a protection circuit for an energy storage power supply according to an exemplary embodiment of the present invention.

[0057] In another embodiment of the present application, if the control unit determines that any power supply operation information is abnormal, the driving switch in the corresponding micro power unit in working state is first disconnected, and then the plurality of the inverter switches and the discharge switch or charging switch in working state are disconnected through the main controller, including: the control unit disconnects the driving switch in the corresponding charging and discharging electronic unit in working state, and generates a power supply fault signal according to the power supply operation information, and sends the power supply fault signal to the main controller, the main controller responds to the power supply fault signal, and disconnects the inverter switch working in each inverter sub-unit, the discharge switch working in the load unit, or the charging switch working in the charging unit. Combined with Figure 7-Figure 8When any control unit determines that the collected power operation information is abnormal, the control unit first disconnects the driving switch (Q1 or Q2) in the charging and discharging electronic unit that is in a working state according to the abnormal power operation information, and then generates a power fault signal F_VCC according to the abnormal power operation information, and sends the collected power operation information and the power fault signal F_VCC to the main controller through CAN communication (Controller Area Network). The main controller receives and responds to the power failure signal F_VCC, and determines whether the energy storage power supply is currently in a charging state or a discharging state. When the energy storage power supply is in a discharging state, the inverter drive signal and the discharge drive signal are converted in level according to the power failure signal F_VCC, and the inverter switch (S1, S2, S3, S4) in the working state in each inverter sub-unit is disconnected by the inverter drive signal, and the discharge switch (K11, K12) in the working state in the load unit is disconnected by the discharge drive signal; when the energy storage power supply is in a charging state, the inverter drive signal and the charging drive signal are converted in level according to the power failure signal F_VCC, and the inverter switch (S1, S2, S3, S4) in the working state in each inverter sub-unit is disconnected by the inverter drive signal, and the charging switch (K21, K22, K31, K32) in the working state in the charging unit is disconnected by the charging drive signal, thereby shutting down the energy storage power supply.

[0058] In another embodiment of the present application, if the main controller determines that the load operation information is abnormal, the main controller first disconnects multiple inverter switches and discharge switches, and then disconnects the driving switches in the multiple micro power units in working state through multiple control units, including: the main controller disconnects the inverter switch in each inverter sub-unit and the discharge switch in the load unit, and generates a load fault signal according to the load operation information, sends the load fault signal to each control unit, and each control unit responds to the load fault signal and disconnects the driving switch in the working state in each charging and discharging electronic unit. Figure 7-Figure 8 When the main controller determines that the collected load operation information is abnormal, the main controller first converts the inverter drive signal and the discharge drive signal according to the abnormal load operation information, disconnects the inverter switch (S1, S2, S3, S4) in the working state in each inverter sub-unit through the inverter drive signal, and disconnects the discharge switch (K11, K12) in the working state in the load unit through the discharge drive signal; then generates a load fault signal F_L according to the abnormal load operation information, and transmits the collected load operation information and the load fault signal F_L to each control unit through CAN communication (Controller Area Network), the control unit receives and responds to the load fault signal F_L, converts the drive signal according to the load fault signal F_L, and disconnects the drive switch (Q1 or Q2) in the working state in each charging and discharging electronic unit.

[0059] In another embodiment of the present application, the main controller determines that the charging operation information is abnormal, and then disconnects multiple inverter switches and charging switches through the main controller, and then disconnects the driving switches in the working state in multiple micro power units through multiple control units, including: the main controller disconnects the inverter switch in each inverter sub-unit and the charging switch in the charging unit, and generates a charging fault signal according to the charging operation information, sends the charging fault signal to each control unit, and each control unit responds to the charging fault signal and disconnects the driving switch working in each charging and discharging electronic unit. Specifically, in combination Figure 7-Figure 8 When the main controller determines that the collected charging operation information is abnormal, the main controller first converts the level of the inverter drive signal and the charging drive signal according to the abnormal charging operation information, disconnects the inverter switch (S1, S2, S3, S4) in the working state in each inverter sub-unit through the inverter drive signal, and disconnects the charging switch (K21, K22, K31, K32) in the working state in the load unit through the charging drive signal; then generates a charging fault signal F_W according to the abnormal charging operation information, and transmits the collected charging operation information and the charging fault signal F_W to each control unit through CAN communication (Controller Area Network), the control unit receives and responds to the charging fault signal F_W, converts the level of the drive signal according to the charging fault signal F_W, and disconnects the driving switch (Q1 or Q2) in the working state in each charging and discharging electronic unit.

[0060] It should be noted that the control unit is a unit that controls each micro power unit one by one, and the main controller is the master control switch of the protection circuit of the energy storage power supply, which is responsible for controlling all micro power units, load units and charging units. Figure 8 As shown, when the protection circuit of the energy storage power supply is started, the main controller obtains the start signal, and the main controller sends a working signal to all the inverter switches, so that some of the inverter switches are in a working state; after the main controller is started, it also sends a WakeUP wake-up instruction to the control unit of each micro power unit to activate the control unit so that each control unit is awakened and establishes CAN communication with the main controller; thereafter, the control unit first sends a drive signal to the second drive switch Q2, and forms a pre-charging loop through the battery pack Vbat, the first resistor R1, the second resistor R2, the second drive switch Q2, and the first capacitor C1, so that the battery pack Vbat pre-charges the first capacitor C1 to protect the capacitor C1 from being damaged by the impact current. When the voltage on both sides of the first capacitor C1 is stable, the control unit detects that the voltage on both ends of the first capacitor C1 reaches the preset capacitance value, and then sends a drive control signal to disconnect the second drive switch Q2 and close the first drive switch Q1, and the battery pack Vbat discharges normally.

[0061] Under normal working conditions, the control unit is responsible for collecting the power supply operation information of the corresponding micro power unit, uploading the collected power supply operation information to the main controller, and calculating the corresponding charge state of the battery pack; at the same time, the main controller collects the load operation information of the load unit and the charging operation information of the charging unit, and also controls the inverter switch of each micro power unit, the discharge switch of the load unit and the charging switch of the charging unit.

[0062] It should be noted that when the main controller determines that the power supply operation information, load operation information and charging operation information of the energy storage power supply are restored from the abnormal state, the main controller obtains the charging and discharging state before the abnormality, and restores the working state of the energy storage power supply according to the charging and discharging state before the abnormality. If the energy storage power supply is in the discharging state before the abnormality, the main controller first closes the inverter switch (S1, S2, S3, S4) of each inverter sub-unit part and the discharge switch (K11, K12) in the discharge unit, and then closes the drive switch (Q1 and Q2) in each charging and discharging electronic unit in sequence; if the energy storage power supply is in the charging state before the abnormality, the main controller first closes the inverter switch (S1, S2, S3, S4) of each inverter sub-unit part and the charging switch (K21, K22, K31, K32) in the charging unit, and then closes the drive switch (Q1 and Q2) in each charging and discharging electronic unit in sequence. Among them, the closing order of the charging switch in the charging unit is to first close the pre-charge control switch (K21, K22), and after the voltage of the second filter capacitor C3 is stable, disconnect the pre-charge control switch (K21, K22), and then close the charging switch (K31, K32).

[0063] The present application provides a protection method and circuit for an energy storage power supply, the method comprising: the energy storage power supply provided comprises a plurality of micro power units, a load unit and a charging unit, the plurality of micro power units are cascaded, and the output is controlled by a plurality of drive switches and a plurality of inverter switches in the micro power unit; the micro power unit, the load unit and the charging unit are monitored to obtain power supply operation information, load operation information and charging operation information; if the power supply operation information, the load operation information or the charging operation information is abnormal, the drive switch in the micro power unit, the plurality of inverter switches, and the discharge switch in the load unit or the charging switch in the charging unit that are in working state are disconnected. The present application monitors the operating state of the power supply end, the load end and the charging end in the energy storage power supply, and as long as an abnormality occurs at one end of the energy storage power supply, the corresponding emergency braking measures are quickly taken to avoid damage to other micro power units when a certain micro power unit, a load unit or a charging power supply has an overvoltage, an overcurrent or other fault, thereby improving the overall safety of the energy storage power supply and extending the service life of the energy storage power supply.

[0064] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for protecting an energy storage power supply, characterized in that: A protection circuit applied to an energy storage power supply, the protection circuit comprising an energy storage power supply, a plurality of control units and a main controller, the energy storage power supply comprising a plurality of micro power units and a load unit, the main controller being connected to each control unit, each micro power unit and the load unit respectively, the plurality of control units being connected to the plurality of micro power units in a one-to-one correspondence, the plurality of micro power units being cascaded in sequence, the first micro power unit and the last micro power unit being connected to the load unit circuit, each micro power unit controlling the output through a plurality of drive switches and a plurality of inverter switches, the method comprising: When the energy storage power source is in a discharging state, each micro power unit and the load unit are monitored to obtain a plurality of power source operation information and load operation information; If any of the power supply operation information or the load operation information is abnormal, disconnecting the driving switch, multiple inverter switches and the discharge switch in the load unit working in the corresponding micro power unit; If the power supply operation information and the load operation information return to normal, the main controller closes a plurality of inverter switches and a drive switch in the micro power unit and a discharge switch in the load unit; The power supply operation information includes sampled voltage, sampled current and battery temperature, and the load operation information includes load voltage and load current.

2. The energy storage power supply protection method according to claim 1, characterized in that: If any of the power supply operation information or the load operation information is abnormal, disconnecting the driving switch, multiple inverter switches and the discharge switch in the corresponding micro power unit, including: If any of the power supply operation information is abnormal, the corresponding drive switch is disconnected first, and then the plurality of inverter switches and the discharge switch are disconnected; If the load operation information is abnormal, the plurality of inverter switches and the discharge switch are disconnected first, and then the drive switch is disconnected.

3. The energy storage power supply protection method according to claim 2, characterized in that: If any of the power supply operation information is abnormal, the corresponding drive switch is disconnected first, and then the plurality of inverter switches and the discharge switch are disconnected, including: The control unit disconnects the driving switch in the micro power unit that is in a working state based on the power supply operation information; The control unit generates a power failure signal based on the power operation information, and sends the power failure signal to the main controller; The main controller responds to the power failure signal and disconnects the plurality of inverter switches and the discharge switches to shut down the energy storage power supply.

4. The method for protecting an energy storage power source according to claim 2, characterized in that: If the load operation information is abnormal, first disconnecting the plurality of inverter switches and the discharge switch, and then disconnecting the drive switch, including: The main controller disconnects the plurality of inverter switches and the discharge switch; The main controller generates a load fault signal according to the load operation information, and sends the load fault signal to each control unit; Each control unit responds to the load fault signal, disconnects the driving switches in the plurality of micro power units that are in working state, and turns off the energy storage power supply.

5. The method for protecting an energy storage power source according to claim 1, characterized in that: If the power supply operation information and the load operation information return to normal, the main controller closes a plurality of inverter switches, a drive switch and a discharge switch in the load unit of the micro power unit, including: The main controller obtains the discharge demand of the energy storage power supply and sets the plurality of inverter switches and the discharge switch to a working state according to the discharge demand, and sends an enable signal to each control unit; Each control unit responds to the enable signal and sets each of the drive switches to an operating state according to the enable signal.

6. The energy storage power supply protection method according to claim 1, characterized in that: The energy storage power supply further includes a charging unit, the first micro power unit and the last micro power unit are connected to the charging unit circuit, and the method further includes: When the energy storage power source is in a charging state, each micro power unit and the charging unit are monitored to obtain a plurality of power source operation information and charging operation information; If any of the power supply operation information or the charging operation information is abnormal, disconnecting the driving switch, multiple inverter switches and the charging switch in the charging unit working in the corresponding micro power unit; If the power supply operation information and the charging operation information return to normal, the main controller closes a plurality of inverter switches and a drive switch in the micro power unit and a charging switch in the charging unit; The charging operation information includes charging voltage and charging current.

7. The energy storage power supply protection method according to claim 6, characterized in that: If any of the power supply operation information or the charging operation information is abnormal, disconnecting the driving switch, the plurality of inverter switches and the charging switch in the corresponding micro power unit, including: If any of the power supply operation information is abnormal, first disconnect the drive switch, and then disconnect the plurality of inverter switches and the charging switch; If the charging operation information is abnormal, the charging switch and the plurality of inverter switches are disconnected first, and then the driving switch is disconnected.

8. The method for protecting an energy storage power source according to claim 6, characterized in that: If the power supply operation information and the charging operation information return to normal, the main controller closes a plurality of inverter switches and a drive switch in the micro power unit and a charging switch in the charging unit; The main controller obtains the charging demand of the energy storage power supply and sets the plurality of inverter switches and the charging switch to a working state according to the charging demand, and sends an enable signal to each control unit; Each control unit responds to the enable signal and sets each of the drive switches to an operating state according to the enable signal.

9. A protection circuit for an energy storage power supply, characterized in that: include: A plurality of micro power units are used to superimpose the output voltage of each power supply to obtain the total power supply output voltage, and perform inversion processing through the micro power units to obtain the power supply output voltage; A load unit, used for filtering the total voltage output by the power supply to obtain a load driving voltage, and applying the load driving voltage to a load device; A charging unit, used to charge the power supply in the micro power unit when the power supply output voltage meets a preset low voltage threshold; Multiple control units, used to sample voltage, current and temperature of corresponding micro power units to obtain multiple power supply operation information; A main controller, used for sampling the voltage and current of the load unit and the charging unit to obtain load operation information and charging operation information; When the control unit determines that any one of the power supply operation information is abnormal, the driving switch in the corresponding micro power unit in working state is first disconnected, and then the plurality of the inverter switches and the discharge switch or the charging switch in working state are disconnected through the main controller; When the main controller determines that the load operation information is abnormal, the main controller first disconnects the plurality of inverter switches and the discharge switches, and then disconnects the driving switches in the plurality of micro power units that are in working state through the plurality of control units; When the main controller determines that the charging operation information is abnormal, the main controller first disconnects the plurality of inverter switches and the charging switches, and then disconnects the driving switches in the plurality of micro power units that are in working state through the plurality of control units; The power supply operation information, the load operation information and the charging operation information of the energy storage power supply are restored from an abnormal state, and the main controller controls the energy storage power supply to restore the working state before the abnormality; The power supply operation information includes a sampled voltage, a sampled current and a battery temperature, the load operation information includes a load voltage and a load current, and the charging operation information includes a charging voltage and a charging current.

10. The protection circuit of the energy storage power supply according to claim 9, characterized in that: The micro power unit includes a charging and discharging electronic unit and an inverter unit, wherein the charging and discharging electronic unit is connected to the inverter unit, the charging and discharging electronic unit is connected to the control unit, and the inverter unit is connected to the main controller.

11. The protection circuit of the energy storage power supply according to claim 10, characterized in that: If the control unit determines that any one of the power supply operation information is abnormal, the driving switch in the corresponding micro power unit in working state is first disconnected, and then the plurality of the inverter switches and the discharge switch or the charging switch in working state are disconnected through the main controller, including: the control unit disconnects the driving switch in the corresponding charging and discharging electronic unit in working state, and generates a power supply fault signal according to the power supply operation information, and sends the power supply fault signal to the main controller, the main controller responds to the power supply fault signal, and disconnects the inverter switch working in each inverter sub-unit, the discharge switch working in the load unit, or the charging switch working in the charging unit.

12. The protection circuit of the energy storage power supply according to claim 10, characterized in that: When the main controller determines that the load operation information is abnormal, the main controller first disconnects the plurality of inverter switches and the discharge switches, and then disconnects the driving switches in the plurality of micro power units that are in working state through the plurality of control units, including: the main controller disconnects the inverter switch in each inverter sub-unit and the discharge switch in the load unit, and generates a load fault signal according to the load operation information, and sends the load fault signal to each control unit, and each control unit responds to the load fault signal and disconnects the driving switch working in each charging and discharging electronic unit.

13. The protection circuit of the energy storage power supply according to claim 10, characterized in that: The main controller determines that the charging operation information is abnormal, and then disconnects the plurality of inverter switches and the charging switches through the main controller, and then disconnects the driving switches in the plurality of micro power units that are in working state through the plurality of control units, including: the main controller disconnects the inverter switch in each inverter sub-unit and the charging switch in the charging unit, and generates a charging fault signal according to the charging operation information, and sends the charging fault signal to each control unit, and each control unit responds to the charging fault signal and disconnects the driving switch working in each charging and discharging electronic unit.

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