A protection method and circuit for an energy storage power supply

Abstract

The present application provides a protection method and circuit for an energy storage power supply. The method includes: the provided energy storage power supply includes a plurality of micro power units and a load 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 units; monitor the micro power units and the load unit to obtain power operation information and load operation information; if the power operation information or the load operation information is abnormal, disconnect the drive switches in the working state in the micro power units and the inverter switches in the working state in each micro power unit. The present application monitors the operating states of the power supply end and the load end in the energy storage power supply, and quickly takes corresponding emergency braking measures when an abnormality occurs at one end, so as to avoid damage to other micro power units when a certain micro power unit or load unit has faults such as overvoltage and overcurrent, improve the overall safety of the energy storage power supply, and ensure the service life of the energy storage power supply.

Description

Technical Field

[0001] The present invention relates to the field of power supplies, and particularly 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 production and life, becoming an indispensable part of production and life. Along with the rapid development of energy storage power supplies and the expansion of their application scenarios, energy storage power supplies need to meet the needs of people in various working scenarios with different DC voltage levels. This requires energy storage power supplies to have the characteristics of convenience, modularity. At the same time, since they need to adapt to the voltage levels of various electrical equipment, they need to have good scalability and the ability to flexibly adapt to different voltage levels. While meeting various requirements, modular energy storage power supplies require each micro power unit to have good startup and protection strategies to prevent damage to the energy storage power supply and industrial equipment when the energy storage power supply is subject to faults such as overvoltage, overcurrent, and short circuit during use. While being able to drive industrial equipment, it can normally protect each micro power unit in the energy storage power supply, minimize damage to the energy storage power supply as much as possible, extend the service life of the energy storage power supply, and reduce the usage risks brought by faults.

[0003] In related technologies, although there are protection methods for energy storage power supplies, in the protection of energy storage power supplies, only the detection of the power supply can be achieved. The protection circuit cannot change the energy storage power supply according to the needs of the load, nor can it perform real-time detection and abnormal handling of the charging circuit during charging.

[0004] Therefore, how to provide a method for an energy storage power supply that can change according to the needs of the load and can be protected in real time is a technical problem that urgently needs to be solved at present. Summary of the Invention

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

[0006] To achieve the above and other related objectives, the technical solutions provided in this application are 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 the energy storage power supply. The protection circuit includes an energy storage power supply, a plurality of control units, and a main controller. The energy storage power supply includes a plurality of micro power units and a load unit. The main controller is respectively connected to each control unit, each micro power unit, and the load unit. The plurality of control units are connected to the plurality of micro power units in a one-to-one correspondence. The plurality of micro power units are cascaded in sequence. The first micro power unit and the last micro power unit are circuit-connected to the load unit. Each micro power unit controls its output through a plurality of drive switches and a plurality of inverter switches. The method includes:

[0008] When the energy storage power supply is in a discharging state, monitor each micro power unit and the load unit to obtain a plurality of power operation information and load operation information;

[0009] If any one of the power operation information or the load operation information is abnormal, disconnect the working drive switches, a plurality of inverter switches in the corresponding micro power unit, and the working discharge switch in the load unit;

[0010] If the power operation information and the load operation information return to normal, the main controller closes a plurality of inverter switches, drive switches in the micro power unit, and the discharge switch in the load unit;

[0011] Wherein, the power operation information includes sampled voltage, sampled current, and battery temperature, and the load operation information includes load voltage and load current.

[0012] In an embodiment of the present application, if any one of the power operation information or the load operation information is abnormal, disconnecting the working drive switches, a plurality of inverter switches in the corresponding micro power unit, and the working discharge switch in the load unit includes: if any one of the power operation information is abnormal, first disconnect the corresponding drive switch, and then disconnect a plurality of the inverter switches and the discharge switch; if the load operation information is abnormal, first disconnect a plurality of the inverter switches and the discharge switch, and then disconnect the drive switch.

[0013] In an embodiment of the present application, if any one of the power operation information is abnormal, first disconnect the corresponding drive switch, and then disconnect a plurality of the inverter switches and the discharge switch, including: the control unit disconnects the drive switch in the working state in the micro power unit based on the power 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, disconnects a plurality of the inverter switches and the discharge switch, and shuts down the energy storage power supply.

[0014] In an embodiment of the present application, if the load operation information is abnormal, first disconnect multiple inverter switches and the discharge switch, and then disconnect the drive switch, including: the main controller disconnects multiple 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 the working state in the multiple micro power units, and shuts down the energy storage power supply.

[0015] In an 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 multiple inverter switches and the discharge switch 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.

[0016] In an embodiment of the present application, the energy storage power supply further includes a charging unit, the first micro power unit and the last micro power unit are circuit-connected to the charging unit, and the method further includes: when the energy storage power supply is in the charging state, monitor each micro power unit and the charging unit to obtain multiple power supply operation information and charging operation information; if any one of the power supply operation information or the charging operation information is abnormal, disconnect the working drive switch, multiple inverter switches in the corresponding micro power unit, and the working charging switch in the charging unit; 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; wherein, the charging operation information includes charging voltage and charging current.

[0017] In an embodiment of the present application, if any one of the power supply operation information or the charging operation information is abnormal, disconnect the working drive switch, multiple inverter switches in the corresponding micro power unit, and the working charging switch in the charging unit, including: if any one of the power supply operation information is abnormal, first disconnect the drive switch, and then disconnect multiple inverter switches and the charging switch; if the charging operation information is abnormal, first disconnect the charging switch and multiple inverter switches, and then disconnect the drive switch.

[0018] In an embodiment of the present application, if the power 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 multiple inverter switches and the charging switch to the working state according to the charging demand, and sends an enabling signal to each control unit; each control unit responds to the enabling signal and sets each drive switch to the working state according to the enabling signal.

[0019] In a second aspect, the present application further provides a protection circuit for an energy storage power supply, including:

[0020] Multiple micro power units, used to superimpose the output voltages of each power supply to obtain the total power output voltage, and perform inversion processing through the micro power unit to obtain the power output voltage;

[0021] A load unit, used to filter the total power output voltage to obtain a load driving voltage, and apply the load driving voltage to a load device;

[0022] A charging unit, used to charge the power supply in the micro power unit when the power output voltage meets a preset low voltage threshold;

[0023] Multiple control units, used to sample the voltage, current, and temperature of the corresponding micro power unit to obtain multiple power operation information;

[0024] A main controller, used to sample the voltage and current of the load unit and the charging unit to obtain load operation information and charging operation information;

[0025] If any of the power operation information is determined to be abnormal by the control unit, first disconnect the drive switch in the corresponding micro power unit that is in the working state, and then disconnect multiple inverter switches and the discharging switch or charging switch in the working state through the main controller;

[0026] If the main controller determines that the load operation information is abnormal, first disconnect multiple inverter switches and the discharging switch through the main controller, and then disconnect the drive switches in the working state in the multiple micro power units through the multiple control units;

[0027] If the main controller determines that the charging operation information is abnormal, first disconnect multiple inverter switches and the charging switch through the main controller, and then disconnect the drive switches in the working state in the multiple micro power units through the multiple control units;

[0028] The power operation information, the load operation information, and the charging operation information of the energy storage power supply recover from the abnormal state, and the main controller controls the energy storage power supply to resume the working state before the abnormality;

[0029] Among them, the power operation information includes the sampled voltage, the sampled current, and the battery temperature, the load operation information includes the load voltage and the load current, and the charging operation information includes the charging voltage and the charging current.

[0030] In another embodiment of the present application, the micro power unit includes a charge and discharge sub-unit and an inverter sub-unit. The charge and discharge sub-unit is connected to the inverter sub-unit, the charge and discharge sub-unit is connected to the control unit, and the inverter sub-unit is connected to the main controller.

[0031] In another embodiment of the present application, if the control unit determines that any one of the power operation information is abnormal, it first disconnects the driving switch in the corresponding micro power unit that is in the working state, and then disconnects a plurality of the inverter switches and the discharging switch or the charging switch in the working state through the main controller, including: the control unit disconnects the driving switch in the corresponding charge and discharge sub-unit that is in the working state, generates a power failure signal according to 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 inverter switch working in each inverter sub-unit, the discharging switch working in the load unit, or the charging switch working in the charging unit.

[0032] In another embodiment of the present application, if the main controller determines that the load operation information is abnormal, it first disconnects a plurality of the inverter switches and the discharging switch through the main controller, and then disconnects the driving switches in the working state in the plurality of micro power units through the plurality of control units, including: the main controller disconnects the inverter switch in each inverter sub-unit and the discharging switch in the load unit, generates a load failure signal according to the load operation information, and sends the load failure signal to each control unit. Each control unit responds to the load failure signal and disconnects the driving switch working in each charge and discharge sub-unit.

[0033] In another embodiment of the present application, if the main controller determines that the charging operation information is abnormal, it first disconnects a plurality of the inverter switches and the charging switch through the main controller, and then disconnects the driving switches in the working state in the plurality of micro power units 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, generates a charging failure signal according to the charging operation information, and sends the charging failure signal to each control unit. Each control unit responds to the charging failure signal and disconnects the driving switch working in each charge and discharge sub-unit.

[0034] The present application provides a protection method and circuit for an energy storage power supply. The method includes: the provided energy storage power supply includes a plurality of micro power units and a load 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 units; monitoring the micro power units and the load unit to obtain power operation information and load operation information; if the power operation information or the load operation information is abnormal, disconnect the drive switches in the working state in the micro power units and the inverter switches in the working state in each micro power unit. The present application monitors the operation states of the power supply end and the load end in the energy storage power supply, and when an abnormality occurs at one end, quickly takes corresponding emergency braking measures to avoid damage to other micro power units when a certain micro power unit or load unit has faults such as overvoltage and overcurrent, improving the overall safety of the energy storage power supply and ensuring the service life of the energy storage power supply. Description of the Drawings

[0035] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present invention, and are used together with the specification to explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts. In the drawings:

[0036] Figure 1 It is a flowchart of a protection method for discharging of an energy storage power supply shown in an exemplary embodiment of the present invention;

[0037] Figure 2 It is a block diagram of a protection circuit for an energy storage power supply shown in an exemplary embodiment of the present invention;

[0038] Figure 3 It is a schematic diagram of an energy storage power supply shown in an exemplary embodiment of the present invention;

[0039] Figure 4 It is a specific structural diagram of a micro power unit shown in an exemplary embodiment of the present invention;

[0040] Figure 5 It is a control diagram of a single micro power unit shown in an exemplary embodiment of the present invention;

[0041] Figure 6 It is a flowchart of a protection method for charging of an energy storage power supply shown in an exemplary embodiment of the present invention;

[0042] Figure 7 It is a block diagram of a protection circuit for an energy storage power supply shown in an exemplary embodiment of the present invention;

[0043] Figure 8Schematic diagram of the protection circuit of the energy storage power supply shown in an exemplary embodiment of the present invention. Detailed implementation manners

[0044] The embodiments of the present invention will be described below 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 content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed 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 explaining the present invention, rather than for limiting the protection scope of the present invention.

[0045] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0046] In the following description, a large number of details are explored 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.

[0047] ‌‌CAN communication‌ is a serial communication protocol bus for real-time applications, belonging to the category of fieldbuses, and is mainly used for data communication in distributed control systems.

[0048] The inventor's research found that with the development of new energy technologies, energy storage power supplies have gradually entered people's production and life and become an indispensable part of production and life. Along with the rapid development of energy storage power supplies and the expansion of their application scenarios, energy storage power supplies need to meet the needs of people in various different DC voltage level working scenarios. This requires energy storage power supplies to have the characteristics of convenience, modularity. At the same time, since it needs to adapt to the voltage levels of various different electrical equipment, it is required to have good scalability and the ability to flexibly adapt to different voltage levels. While meeting various requirements, modular energy storage power supplies require each micro power unit to have good startup and protection strategies to prevent damage to the energy storage power supply and industrial equipment when the energy storage power supply is affected by faults such as overvoltage, overcurrent, and short circuit during use. While being able to drive industrial equipment normally, it can protect each micro power unit in the energy storage power supply, minimize the damage to the energy storage power supply as much as possible, improve the service life of the energy storage power supply, and reduce the usage risks brought by faults.

[0049] In the related art, although there are protection methods for energy storage power supplies, only the detection of the power supply can be achieved in the protection of the energy storage power supply. The protection circuit cannot make corresponding changes to the energy storage power supply according to the load requirements, nor can it detect and handle abnormalities in the charging circuit during charging.

[0050] Please refer to Figure 1 , Figure 1 which is a flowchart of a protection method for discharging an energy storage power supply shown in an exemplary embodiment of the present invention.

[0051] As Figure 1 shown, the present application provides a protection method for an energy storage power supply. The protection method is applied to a protection circuit of the energy storage power supply. The protection circuit includes an energy storage power supply, a plurality of control units, and a main controller. The energy storage power supply includes a plurality of micro power units and a load unit. The main controller is respectively connected to each control unit, each micro power unit, and the load unit. The plurality of control units are connected to the plurality of micro power units in a one-to-one correspondence. The plurality of micro power units are cascaded in sequence. The first micro power unit and the last micro power unit are connected to the load unit circuit. Each micro power unit controls the output through a plurality of drive switches and a plurality of inverter switches. This at least includes steps S110 to S130, which are introduced in detail as follows:

[0052] S110. When the energy storage power supply is in a discharging state, monitor each micro power unit and the load unit to obtain a plurality of power operation information and load operation information;

[0053] S120. If any one of the power operation information or the load operation information is abnormal, disconnect the working drive switches, a plurality of inverter switches in the corresponding micro power unit, and the working discharge switch in the load unit;

[0054] S130. If the power operation information and the load operation information return to normal, the main controller closes a plurality of inverter switches, drive switches in the micro power unit, and the discharge switch in the load unit;

[0055] Among them, the power operation information includes sampled voltage, sampled current, and battery temperature, and the load operation information includes load voltage and load current.

[0056] If the power operation information or the load operation information is always abnormal, the energy storage power supply remains in a closed state all the time.

[0057] Please refer to Figure 2 , Figure 2 which is a block diagram of a protection circuit of an energy storage power supply shown in an exemplary embodiment of the present invention.

[0058] Please refer to Figure 3 , Figure 3Schematic diagram of an energy storage power supply shown for an exemplary embodiment of the present invention.

[0059] Specifically, as Figure 2 shown, the protection circuit of the energy storage power supply includes an energy storage power supply, a plurality of control units and a main controller. The energy storage power supply includes a plurality of micro power units, a load unit and a charging unit. The main controller is respectively connected to each control unit, each micro power unit, the load unit and the charging unit. The plurality of control units are connected to the plurality of micro power units in one-to-one correspondence. As Figure 3 shown, the plurality of micro power units are cascaded in sequence. The first input / output terminal of the first micro power unit is connected to the first input terminal of the load unit, and the first input / output terminal of the first micro power unit is also connected to the first output terminal of the charging unit. The second input / output terminal of the first micro power unit is connected to the first input / output terminal of the second micro power unit. The second input / output terminal of the i-th micro power unit is connected to the first input / output terminal of the (i + 1)-th micro power unit. The second input / output terminal of the last micro power unit is connected to the second input terminal of the load unit, and the second input / output terminal of the last micro power unit is also connected to the second output terminal of the charging unit. The total output voltage of the power supply is obtained through the cascaded plurality of 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 acts on the load. Wherein, i is an integer, 1 ≤ i ≤ n, n is the number of control units, and n ≥ 1.

[0060] As Figure 3 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 through 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 through the second discharge switch K12. The other end of the first filter inductor L1 is the first input terminal of the load unit, and the other end of the first filter capacitor C2 is the second input terminal of the load unit.

[0061] As Figure 3As shown in the figure, 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 pole of the power grid Grid through 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 pole of the power grid Grid through the first charging switch K31. The other end of the second filter capacitor C3 is connected to the negative pole of the power grid Grid through 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 pole of the power grid Grid through the second charging switch K32. Among them, 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.

[0062] It should be noted that the discharge switch includes a first discharge switch K11 and a second discharge switch K12, and the charging switch includes 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.

[0063] Please refer to Figure 4 , Figure 4 which is the specific structure diagram of the micro power unit shown in an exemplary embodiment of the present invention.

[0064] As Figure 4 shown, as Figure 4 shown, the micro power unit includes a charge and discharge sub-unit and an inverter sub-unit. The charge and discharge sub-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 pole of the battery pack Vbat, and 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 pole of the resistor group Vbat through the fuse F, and 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, and the other end of the second resistor R2 is connected to one end of the second drive switch Q2. The other end of the second drive switch Q2 is connected to the other end of the first drive switch Q1.

[0065] As Figure 4As shown in the figure, the inverter sub-unit 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 / output end of the inverter sub-unit, the first input / output end of the inverter sub-unit is the first input / output end of the micro power unit, one end of the fourth inverter switch S4 is the second input / output end of the inverter sub-unit, and the second input / output end of the inverter sub-unit is the second input / output end of the micro power unit. It should be noted that the pre-charge 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 operating normally, first close the second drive switch Q2, and the battery pack Vbat pre-charges the first capacitor C1, then disconnect the second drive switch Q2 and close the first drive switch Q1, and the battery pack Vbat charges the first capacitor C1.

[0066] Please refer to Figure 5 , Figure 5 which is the control diagram of a single micro power unit shown in an exemplary embodiment of the present invention.

[0067] As Figure 5 shown, voltage, current, and temperature sampling are performed on the micro power unit to obtain power supply operation information, including: collecting the voltage, current, and temperature of the battery pack Vbat through the control unit to obtain the battery voltage, battery current, and battery temperature; collecting the voltage across the first drive switch Q1 through the control unit to obtain the drive voltage, collecting the current of the first resistor R1 through the control unit to obtain the working current of the charge and discharge sub-unit, and collecting the voltage across the first capacitor C1 through 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, charging voltage, etc. The sampled current includes the battery current, charging current, etc. The sampled temperature is the battery temperature.

[0068] As Figure 5 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 the 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.

[0069] In one embodiment of the present application, if any power operation information or load operation information is abnormal, the driving switch, multiple inverter switches, and discharge switch in the corresponding micro power unit that are in operation are disconnected, including: if any power operation information is abnormal, the corresponding driving switch is first disconnected, 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 first disconnected, and then the driving switch is disconnected. Specifically, when any power operation information is abnormal, the driving switch in the corresponding micro power unit that is in the working state is first disconnected, and then the multiple inverter switches and the discharge switch are disconnected. For example, as Figure 5 shown, when the sampled voltage, sampled current, or sampled temperature of one of the multiple micro power units is abnormal, the driving switch (Q1 or Q2) in the abnormal micro power unit that is in the working state is first disconnected, and then the inverter switches (S1, S2, S3, S4) and the discharge switch (K11, K12) that are in the working state are disconnected. When the load operation information is abnormal, it will cause phenomena such as overload of the load unit. If the overload time is too long, it will cause damage to the energy storage power supply. Therefore, the inverter switches (S1, S2, S3, S4) and the discharge switch (K11, K12) that are in the working state are first disconnected, and then the driving switch (Q1 or Q2) in the micro power unit that is in the working state is disconnected.

[0070] In one embodiment of the present application, if any power operation information is abnormal, the corresponding driving switch is first disconnected, and then the multiple inverter switches and the discharge switch are disconnected, including: the control unit disconnects the driving switch in the micro power unit that is in the working state based on the power 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 multiple inverter switches and the discharge switch, and shuts down the energy storage power supply. As Figure 5As shown, the control unit collects information from the micro power unit to obtain the power supply operation information. The control unit judges the collected power supply operation information one by one, and calculates the charge amount of the corresponding battery according to the battery current and the acquisition time. When at least one of the power supply operation information is abnormal, the control unit disconnects the driving switch (Q1 or Q2) in the charge and discharge sub-unit that is in the working state. The control unit generates a power supply fault signal F_VCC according to the power supply operation information, and sends the collected power supply operation information and the power supply fault signal F_VCC to the main controller through CAN communication (Controller Area Network); the main controller receives and responds to the power supply fault signal F_VCC, and performs level conversion on the inverter drive signal and the discharge drive signal according to the power supply fault signal F_VCC, applies the inverter drive signal to each inverter sub-unit, disconnects the inverter switches (S1, S2, S3, S4) in the working state in each inverter sub-unit, and applies the inverter drive signal to the discharge switches (K11, K22) in the working state in the charging unit to turn off the energy storage power supply.

[0071] In an embodiment of the present application, if the load operation information is abnormal, the multiple inverter switches and the discharge switch are first disconnected, and then the driving switch is disconnected, including: the main controller disconnects the multiple 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 driving switch in the working state in the multiple micro power units to turn off the energy storage power supply. As Figure 5 As shown, when the main controller determines that the collected load operation information is abnormal, the main controller first performs level conversion on 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, disconnects the inverter switches (S1, S2, S3, S4) in the working state in each inverter sub-unit, and at the same time, applies the inverter drive signal to the discharge switches (K11, K22) in the working state in the charging unit; then generates a load fault signal F_L according to the 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, performs level conversion on the drive signal according to the load fault signal F_L, and disconnects the driving switch (Q1 or Q2) in the working state in each charge and discharge sub-unit.

[0072] In an embodiment of the present application, if the power operation information and the load operation information return to normal, the main controller closes multiple inverter switches, drive switches, and discharge switches 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 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 the elimination of the fault, the power 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, performs level conversion on the inverter drive signal and the discharge drive signal 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 sends an enable signal EN to each control unit. Each control unit receives and responds to the enable signal EN, first closes the second drive switch Q2 according to the enable signal EN, charges the first capacitor C1 through the pre-charge 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 supply power to the load device.

[0073] When the power of the energy storage power supply is lower than the preset low voltage threshold, it is necessary to charge the energy storage power supply, and the charging process of the energy storage power supply also needs to be protected.

[0074] As Figure 6 shown, the protection method of the energy storage power supply further includes steps S610 to S630:

[0075] S610. When the energy storage power supply is in the charging state, monitor each micro power unit and the charging unit to obtain multiple power operation information and charging operation information;

[0076] S620. If any power operation information or charging operation information is abnormal, disconnect the working drive switch in the corresponding micro power unit, multiple inverter switches, and the working charging switch in the charging unit;

[0077] S630. If the power operation information and the charging operation information return to normal, the main controller closes multiple inverter switches, drive switches, and charging switches in the micro power unit;

[0078] Among them, the charging operation information includes charging voltage and charging current.

[0079] As Figure 5As 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.

[0080] In an 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 in the corresponding micro power unit that are working are disconnected, including: if any power supply operation information is abnormal, the driving switch is first disconnected, 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 first disconnected, and then the driving switch is disconnected. For example, as Figure 5 shown, when the sampled voltage, sampled current, or sampled temperature of one of the multiple micro power units is abnormal, the driving switch (Q1 or Q2) in the abnormal micro power unit that is in the working state is first disconnected, and then the inverter switches (S1, S2, S3, S4) and the charging switch (K21, K22, K31, K32) in the working state are disconnected. When the charging operation information is abnormal, the charging current and voltage are abnormal, which will reduce the battery life. Therefore, the inverter switches (S1, S2, S3, S4) and the charging switch (K21, K22, K31, K32) in the working state are first disconnected, and then the driving switch (Q1 or Q2) in the micro power unit that is in the working state is disconnected.

[0081] In one embodiment of the present application, if the power 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 multiple inverter switches and the charging switch 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 operation information and the charging operation information change from abnormal to normal. The main controller obtains the charging demand of the energy storage power supply, converts the levels of the inverter drive signal and the charging drive signal according to the charging demand, so that multiple inverter switches (S1, S2, S3, S4) and the charging switch (K21, K22, K31, K32) are set to the working state. For the control of the charging switch, first close the pre-charge control switches (K21, K22). After the voltage of the second filter capacitor C3 is stable, disconnect the pre-charge control switches (K21, K22), and then close the charging switches (K31, K32); and send an enable signal EN to 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.

[0082] It should be emphasized that the principle of controlling the drive switch (Q1 or Q2), the inverter switch (S1, S2, S3, S4), and the charging switch (K21, K22, K31, K32) in sequence during the charging process is the same as that during the discharging process, and will not be elaborated here.

[0083] Please refer to Figure 7 , the block diagram of the protection circuit of the energy storage power supply shown in an exemplary embodiment of the present invention.

[0084] As Figure 7 shown, the present application also provides a protection circuit for an energy storage power supply, including:

[0085] Multiple micro power units, used to superimpose the output voltage of each power supply to obtain the total power supply output voltage, and perform inverter processing through the micro power unit to obtain the power supply output voltage;

[0086] The load unit is used to filter the total power supply output voltage to obtain the load drive voltage and apply the load drive voltage to the load device;

[0087] The charging unit is used to charge the power supply in the micro power unit when the power supply output voltage meets the preset low voltage threshold;

[0088] Multiple control units are used to sample the voltage, current, and temperature of the corresponding micro power unit to obtain multiple power operation information;

[0089] 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;

[0090] If the control unit determines that any one of the power operation information is abnormal, it first disconnects the driving switch (Q1 or Q2) in the corresponding micro power unit that is in the working state, and then disconnects multiple inverter switches (S1, S2, S3, S4) and the discharging switch (K11, K12) or the charging switch (K21, K22, K31, K32) in the working state through the main controller;

[0091] If the main controller determines that the load operation information is abnormal, it first disconnects multiple inverter switches (S1, S2, S3, S4) and the discharging switch (K11, K12) through the main controller, and then disconnects the driving switch (Q1 or Q2) in the working state in multiple micro power units through multiple control units;

[0092] If the main controller determines that the charging operation information is abnormal, it first disconnects multiple inverter switches (S1, S2, S3, S4) and the charging switch (K21, K22, K31, K32) through the main controller, and then disconnects the driving switch (Q1 or Q2) in the working state in multiple micro power units through multiple control units;

[0093] When the power operation information, the load operation information, and the charging operation information of the energy storage power supply recover from the abnormal state, the controller controls the energy storage power supply to resume the working state before the abnormality;

[0094] Among them, the power operation information includes the sampled voltage, the sampled current, and the battery temperature, the load operation information includes the load voltage and the load current, and the charging operation information includes the charging voltage and the charging current.

[0095] In another embodiment of the present application, the micro power unit includes a charge-discharge sub-unit and an inverter sub-unit. The charge-discharge sub-unit is connected to the inverter sub-unit, the charge-discharge sub-unit is connected to the control unit, and the inverter sub-unit is connected to the main controller. As Figure 5 shown, the micro power unit includes a charge-discharge sub-unit and an inverter sub-unit. The charge-discharge sub-unit is connected to the inverter sub-unit, the charge-discharge sub-unit is connected to the control unit, and the inverter sub-unit is connected to the main controller.

[0096] Please refer to Figure 8 , Figure 8 which is a schematic diagram of the protection circuit of the energy storage power supply shown in an exemplary embodiment of the present invention.

[0097] In another embodiment of the present application, when the control unit determines that any power operation information is abnormal, it first disconnects the driving switch in the corresponding micro power unit that is in the working state, and then disconnects a plurality of the inverter switches and the discharging switch or charging switch in the working state through the main controller, including: the control unit disconnects the driving switch in the corresponding charge and discharge sub-unit that is in the working state, generates a power failure signal according to 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 inverter switch in each inverter sub-unit that is in the working state, the discharging switch in the load unit that is in the working state, or the charging switch in the charging unit that is in the working state. Combined with Figures 7 - 8 , when 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 charge and discharge sub-unit that is in the working state according to the abnormal power operation information, then generates a power failure signal F_VCC according to the abnormal power operation information, and sends the collected power operation information and the power failure 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 the charging state or the discharging state. If the energy storage power supply is in the discharging state, it performs a level conversion on the inverter driving signal and the discharging driving signal according to the power failure signal F_VCC, disconnects the inverter switch (S1, S2, S3, S4) in each inverter sub-unit that is in the working state through the inverter driving signal, and disconnects the discharging switch (K11, K12) in the load unit that is in the working state through the discharging driving signal; if the energy storage power supply is in the charging state, it performs a level conversion on the inverter driving signal and the charging driving signal according to the power failure signal F_VCC, disconnects the inverter switch (S1, S2, S3, S4) in each inverter sub-unit that is in the working state through the inverter driving signal, and disconnects the charging switch (K21, K22, K31, K32) in the charging unit that is in the working state through the charging driving signal, thereby shutting down the energy storage power supply.

[0098] In another embodiment of the present application, when the main controller determines that the load operation information is abnormal, it first disconnects a plurality of inverter switches and discharging switches through the main controller, and then disconnects the driving switches in the corresponding micro power units that are in the working state through a plurality of control units, including: the main controller disconnects the inverter switch in each inverter sub-unit and the discharging switch in the load unit, generates a load failure signal according to the load operation information, and sends the load failure signal to each control unit. Each control unit responds to the load failure signal and disconnects the driving switch in each charge and discharge sub-unit that is in the working state. Combined with Figures 7 - 8, when the main controller determines that the collected load operation information is abnormal, the main controller first performs level conversion on the inverter drive signal and the discharge drive signal according to the abnormal load operation information, disconnects the inverter switches (S1, S2, S3, S4) in the working state in each inverter subunit through the inverter drive signal, and disconnects the discharge switches (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, performs level conversion on the drive signal according to the load fault signal F_L, and disconnects the drive switches (Q1 or Q2) in the working state in each charge-discharge subunit.

[0099] In another embodiment of the present application, when the main controller determines that the charging operation information is abnormal, the main controller first disconnects a plurality of inverter switches and charging switches through the main controller, and then disconnects the drive switches in the working state in a plurality of micro power units through a plurality of control units, including: the main controller disconnects the inverter switches in each inverter subunit and the charging switches in the charging unit, generates a charging fault signal according to the charging operation information, and sends the charging fault signal to each control unit. Each control unit responds to the charging fault signal and disconnects the drive switches in the working state in each charge-discharge subunit. Specifically, combined with Figures 7 - 8 , when the main controller determines that the collected charging operation information is abnormal, the main controller first performs level conversion on the inverter drive signal and the charging drive signal according to the abnormal charging operation information, disconnects the inverter switches (S1, S2, S3, S4) in the working state in each inverter subunit through the inverter drive signal, and disconnects the charging switches (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, performs level conversion on the drive signal according to the charging fault signal F_W, and disconnects the drive switches (Q1 or Q2) in the working state in each charge-discharge subunit.

[0100] It should be noted that the control unit is a unit corresponding to each micro power unit one by one, and the main controller is the total control switch of the protection circuit of the energy storage power supply, responsible for controlling all micro power units, load units and charging units. Such as Figure 8As shown in the figure, when the protection circuit of the energy storage power supply is started, the main controller obtains the start signal, and the main controller sends working signals to all inverter switches, so that some inverter switches are in the working state; after the main controller is started, it also sends WakeUP wake-up instructions to the control unit of each micro power unit to activate the control unit, so that each control unit is woken up and establishes CAN communication with the main controller; after that, the control unit first sends a drive signal to the second drive switch Q2, and forms a pre-charge circuit 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 inrush current. When the voltage across the first capacitor C1 is stable, the control unit detects that the voltage across the first capacitor C1 reaches the preset capacitor 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 to the outside.

[0101] Under normal working conditions, the control unit is responsible for collecting the power operation information of the corresponding micro power unit, uploading the collected power operation information to the main controller, and also calculating the charge state corresponding to 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 switches of each micro power unit, the discharge switches of the load unit, and the charging switches of the charging unit.

[0102] It should be noted that when the main controller determines that the power operation information, load operation information, and charging operation information of the energy storage power supply return from the abnormal state, the main controller obtains the charge and discharge state before the abnormality, and restores the working state of the energy storage power supply according to the charge and discharge state before the abnormality. If the energy storage power supply was in the discharge state before the abnormality, the main controller first closes the inverter switches (S1, S2, S3, S4) of each inverter sub-unit part and the discharge switches (K11, K12) in the discharge unit, and then sequentially closes the drive switches (Q1 and Q2) in each charge and discharge sub-unit; if the energy storage power supply was in the charging state before the abnormality, the main controller first closes the inverter switches (S1, S2, S3, S4) of each inverter sub-unit part and the charging switches (K21, K22, K31, K32) in the charging unit, and then sequentially closes the drive switches (Q1 and Q2) in each charge and discharge sub-unit. Among them, the closing sequence of the charging switches in the charging unit is to first close the pre-charge control switches (K21, K22), and after the voltage of the second filter capacitor C3 is stable, disconnect the pre-charge control switches (K21, K22), and then close the charging switches (K31, K32).

[0103] The present application provides a protection method and circuit for an energy storage power supply. The method includes: the provided energy storage power supply includes 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 units; monitor the micro power units, the load unit, and the charging unit to obtain power operation information, load operation information, and charging operation information; if the power operation information, the load operation information, or the charging operation information is abnormal, disconnect the drive switches in the working state in the micro power units, the plurality of inverter switches, and the discharge switch in the load unit or the charging switch in the charging unit. The present application monitors the operation states of the power supply end, the load end, and the charging end in the energy storage power supply. As long as an abnormality occurs at one end of the energy storage power supply, corresponding emergency braking measures are quickly taken to avoid damage to other micro power units when a certain micro power unit, load unit, or charging power supply fails due to overvoltage, overcurrent, etc., improve the overall safety of the energy storage power supply, and extend the service life of the energy storage power supply.

[0104] The above embodiments are only used to exemplarily illustrate the principles and effects of the present invention, rather than to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should 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 the sampled voltage, sampled current and battery temperature, and the load operation information includes the load voltage and load current; If any of the power supply operation information or the load operation information is abnormal, disconnecting the driving switch, the plurality of inverter switches and the discharge switch in the corresponding micro power unit and the load 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.

2. The energy storage power supply protection method according to claim 1, 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.

3. The energy storage power supply protection method according to claim 1, 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.

4. The energy storage power supply protection method 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.

5. The method for protecting an energy storage power source 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.

6. The energy storage power supply protection method according to claim 5, 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.

7. The energy storage power supply protection method according to claim 5, 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.

8. 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; If the control unit determines that any 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 main controller disconnects the multiple inverter switches and the discharge switch or charging switch in working state; 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.

9. The protection circuit of the energy storage power supply according to claim 8, 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.

10. The protection circuit of the energy storage power supply according to claim 9, 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.

11. The protection circuit of the energy storage power supply according to claim 9, 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.

12. The protection circuit of the energy storage power supply according to claim 9, 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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