A bidirectional energy storage inverter

Abstract

The present invention discloses a bidirectional energy storage inverter, which relates to the technical field of power conversion. It includes an intelligent control module for receiving signals and module control; a charge and discharge control module for controlling the charge and discharge of an energy storage module; an inverter control module for selecting the path state connected to an inverter module and transmitting signals; an inverter module for performing inversion and rectification processing and controlling a power transistor circuit to access a full-bridge inverter circuit; a switching control module for controlling the connection between the inverter module and an AC module; an AC module for outputting and providing alternating current; and an output detection module for voltage detection. The bidirectional energy storage inverter of the present invention completes inversion and rectification processing through the inverter module, cooperates with the charge and discharge control module to control the energy storage and discharge of the energy storage module, controls the inverter control module to connect the power transistor circuit to the full-bridge inverter circuit according to the signals detected by the output detection module, and the switching control module controls the output path so as to maintain the operation of the inverter module.

Description

Technical Field

[0001] The present invention relates to the technical field of power conversion, and particularly to a bidirectional energy storage inverter. Background Art

[0002] A bidirectional energy storage inverter is the latest generation of inverter in today's market. It can convert AC electrical energy into DC electrical energy and store it in an energy storage device. After a power outage, the inverter converts the DC electrical energy in the energy storage device into AC electrical energy for users, providing a two-way conversion between grid electrical energy and energy storage device electrical energy. To ensure the safety of the bidirectional energy storage inverter, the existing bidirectional energy storage inverter adopts a dual-inverter circuit controlled by a single-chip microcomputer. When a fault occurs in one of the inverter circuits, the electrical energy is automatically switched to the other inverter circuit to maintain the working state of the inverter and ensure the normal conversion of the power supply. However, the dual-inverter circuit easily leads to a complex circuit structure, a large volume, and requires a large number of pins of the single-chip microcomputer, and the control is relatively complex. Therefore, it needs to be improved. Summary of the Invention

[0003] Embodiments of the present invention provide a bidirectional energy storage inverter to solve the problems raised in the above background art.

[0004] According to embodiments of the present invention, a bidirectional energy storage inverter is provided. The bidirectional energy storage inverter includes: an energy storage module, a charge and discharge control module, an intelligent control module, an inverter module, an inverter control module, a switching control module, an AC module, and an output detection module;

[0005] The energy storage module is used to store the electrical energy output by the charge and discharge control module and output electrical energy;

[0006] The intelligent control module is used to receive the signal output by the output detection module, output a first pulse signal and control the operation of the charge and discharge control module, output a control signal and control the operation of the inverter control module and the switching control module, and output a second pulse signal;

[0007] The charge and discharge control module is connected to the energy storage control module and the intelligent control module, and is used to control the charge and discharge control circuit to adjust the voltage of the electrical energy output by the energy storage module and transmit it to the inverter module through the first pulse signal, and control the charge and discharge control circuit to adjust the voltage of the electrical energy output by the inverter module and input it into the energy storage module through the first pulse signal;

[0008] The inverter control module is connected to the intelligent control module, and is used to control the analog switch circuit to select the path connected to the inverter module through the control signal, and transmit the second pulse signal to the inverter module;

[0009] The inverter module is connected to the charge and discharge control module and the inverter control module, and is configured to receive the second pulse signal transmitted by the inverter control module, perform an inversion process on the input DC power and a rectification process on the input AC power through a full-bridge inverter circuit, and control the power tube circuit to be connected to the full-bridge inverter circuit.

[0010] The switching control module is connected to the AC module and the intelligent control module, and is configured to receive the second pulse signal and control the connection state between the inverter module and the AC module through a relay switch circuit.

[0011] The AC module is connected to the inverter module, and is configured to receive the AC power output by the inverter module and provide AC power for the inverter module.

[0012] The output detection module is connected to the AC module and the intelligent control module, and is configured to detect the AC power input to the AC module, perform amplification and filtering processing on the detected signal, and transmit the processed signal to the intelligent control module.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The bidirectional energy storage inverter of the present invention controls the inverter module through the intelligent control module to complete the inversion process and the rectification process, realizes the bidirectional conversion of electric energy, and cooperates with the charge and discharge control module to control the energy storage and discharge control of the energy storage module. When the output is abnormal, the intelligent control module controls the inverter control module to control the power tube circuit in the inverter module to be connected to the full-bridge inverter circuit, switch the inverter path, and control the switching control module to control the output path, so as to maintain the normal operation of the inverter module and the normal AC power supply, improve the working efficiency of the inverter module, and the control structure of the module is simple and easy to implement, requiring fewer control pins and having a small overall volume of the module. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a schematic block diagram of the principle of the bidirectional energy storage inverter provided by an embodiment of the present invention.

[0016] Figure 2 It is a circuit diagram of the bidirectional energy storage inverter provided by an embodiment of the present invention.

[0017] Figure 3 It is a circuit diagram of the output detection module provided by an embodiment of the present invention.

[0018] Figure 4 Circuit diagram of the switching control module provided for the example of the present invention. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Example 1, please refer to Figure 1 , a bidirectional energy storage inverter includes: an energy storage module 1, a charge and discharge control module 2, an intelligent control module 3, an inverter module 4, an inverter control module 5, a switching control module 6, an AC module 7, and an output detection module 8;

[0021] Specifically, the energy storage module 1 is used to store the electric energy output by the charge and discharge control module 2 and output electric energy;

[0022] The intelligent control module 3 is used to receive the signal output by the output detection module 8, output a first pulse signal and control the operation of the charge and discharge control module 2, output a control signal and control the operation of the inverter control module 5 and the switching control module 6, and output a second pulse signal;

[0023] The charge and discharge control module 2 is connected to the energy storage control module and the intelligent control module 3, and is used to control the charge and discharge control circuit to adjust the voltage of the electric energy output by the energy storage module 1 through the first pulse signal and transmit it to the inverter module 4, and control the charge and discharge control circuit to adjust the voltage of the electric energy output by the inverter module 4 through the first pulse signal and input it into the energy storage module 1;

[0024] The inverter control module 5 is connected to the intelligent control module 3, and is used to control the analog switch circuit to select the path connected to the inverter module 4 through the control signal and transmit the second pulse signal to the inverter module 4;

[0025] The inverter module 4 is connected to the charge and discharge control module 2 and the inverter control module 5, and is used to receive the second pulse signal transmitted by the inverter control module 5, perform an inversion process on the input DC electric energy and a rectification process on the input AC electric energy through a full-bridge inverter circuit, and control the power tube circuit to access the full-bridge inverter circuit;

[0026] The switching control module 6, connected to the AC module 7 and the intelligent control module 3, is configured to receive the second pulse signal and control the connection state between the inverter module 4 and the AC module 7 through a relay switch circuit;

[0027] The AC module 7, connected to the inverter module 4, is configured to receive the AC electric energy output by the inverter module 4 and to supply AC electric energy to the inverter module 4;

[0028] The output detection module 8, connected to the AC module 7 and the intelligent control module 3, is configured to detect the AC electric energy input to the AC module 7 and perform amplification and filtering processing on the detected signal, and to transmit the processed signal to the intelligent control module 3.

[0029] In a specific embodiment, the above energy storage module 1 is a DC energy storage device, which will not be elaborated here; the above charge and discharge control module 2 can adopt a bidirectional Boost-Buck circuit, controlled by the intelligent control module 3 to achieve charge and discharge control of electric energy; the above intelligent control module 3 can adopt a drive circuit and a micro-control circuit, where the drive circuit can select an IGBT drive device, which is used to improve the drive ability of the micro-control circuit and is only used when driving an IGBT, and will not be elaborated here. The micro-control circuit can be selected, but is not limited to a single-chip microcomputer, DSP, etc. that integrate components such as an arithmetic unit, a controller, a memory, and an input / output device to implement functions such as signal processing, data storage, module control, and timing control; the above inverter module 4 can select a full-bridge inverter circuit and a power transistor circuit. The full-bridge inverter circuit performs inversion and rectification processing, and the power transistor circuit can be used as a replacement circuit for the full-bridge inverter circuit to replace the faulty power transistor circuit in the full-bridge inverter circuit; the above inverter control module 5 can select an analog switch circuit, controlled by the intelligent control module 3, to transmit the second pulse signal to the inverter module 4 according to the selected path; the above switching control module 6 can adopt a relay circuit, controlled by the intelligent control module 3, to achieve the connection state between the above full-bridge inverter circuit and the power transistor circuit and the AC module 7; the above AC module 7 can adopt an AC power supply or an AC consumption device, which will not be elaborated here; the above output detection module 8 can adopt an output detection and processing circuit to detect the alternating current input to the above AC module 7 and perform amplification and filtering processing on the detected signal.

[0030] Embodiment 2, on the basis of Embodiment 1, please refer to Figure 2 、 Figure 3 and Figure 4 The energy storage module 1 includes an energy storage device; the charge and discharge control module 2 includes a first capacitor C1, a first inductor L1, a first power transistor Q1, a second power transistor Q2, a first resistor R1, and a second capacitor C2; the intelligent control module 3 includes a first controller U1;

[0031] Specifically, the first end of the energy storage device is connected to one end of the first capacitor C1 and one end of the first inductor L1. The other end of the first inductor L1 is connected to the emitter of the second power transistor Q2 and the collector of the first power transistor Q1. The other end of the first capacitor C1, the second end of the energy storage device, and the emitter of the first power transistor Q1 are all grounded. The collector of the second power transistor Q2 is connected to one end of the first resistor R1 and the first end of the second capacitor C2. The other end of the first resistor R1 and the second end of the second resistor R2 are both grounded. The gates of the first power transistor Q1 and the second power transistor Q2 are respectively connected to the first IO terminal and the second IO terminal of the first controller U1.

[0032] In a specific embodiment, the above-mentioned first power transistor Q1 and second power transistor Q2 can both be IGBTs, which cooperate with the first inductor L1 and the first capacitor C1 to form a bidirectional Boost-Buck circuit and are controlled by the first controller U1 to achieve charge and discharge control of the energy storage device. The above-mentioned first resistor R1 is used for current shunting, and the second capacitor C2 is used for filtering. The above-mentioned first controller U1 can be selected, but is not limited to, the STM32 single-chip microcomputer with an IGBT driver and the ST89C52 single-chip microcomputer with an IGBT driver.

[0033] Furthermore, the inverter module 4 includes a third power transistor Q3, a fourth power transistor Q4, a fifth power transistor Q5, a sixth power transistor Q6, a seventh power transistor Q7, and an eighth power transistor Q8.

[0034] Specifically, the collector of the third power transistor Q3 is connected to the collector of the fifth power transistor Q5, the collector of the seventh power transistor Q7, and the first end of the second capacitor C2. The emitter of the third power transistor Q3 is connected to the collector of the fourth power transistor Q4. The emitter of the fifth power transistor Q5 is connected to the collector of the sixth power transistor Q6, and the emitter of the seventh power transistor Q7 is connected to the collector of the eighth power transistor Q8. The emitters of the fourth power transistor Q4, the sixth power transistor Q6, and the eighth power transistor Q8 are all grounded. The gates of the third power transistor Q3, the fourth power transistor Q4, the fifth power transistor Q5, the sixth power transistor Q6, the seventh power transistor Q7, and the eighth power transistor Q8 are connected to the inverter control module 5.

[0035] In a specific embodiment, the above-mentioned third power transistor Q3, fourth power transistor Q4, fifth power transistor Q5, sixth power transistor Q6, seventh power transistor Q7, and eighth power transistor Q8 can all be IGBTs. Among them, the third power transistor Q3, the fourth power transistor Q4, the seventh power transistor Q7, and the eighth power transistor Q8 form a full-bridge inverter circuit, and the fifth power transistor Q5 and the sixth power transistor Q6 form a power transistor circuit for replacing the third power transistor Q3 and the fourth power transistor Q4 and the seventh power transistor Q7 and the eighth power transistor Q8.

[0036] Further, the switching control module 6 includes a first relay switch K1-1 and a second relay switch K2-1; the AC module 7 includes an AC device.

[0037] Specifically, the first end of the first relay switch K1-1 is connected to the first end of the AC device and the emitter of the third power transistor Q3, the first end of the second relay switch K2-1 is connected to the second end of the AC device and the emitter of the seventh power transistor Q7, and the second end of the first relay switch K1-1 is connected to the second end of the second relay switch K2-1 and the emitter of the fifth power transistor Q5.

[0038] In a specific embodiment, both the above-mentioned first relay switch K1-1 and second relay switch K2-1 can be selected as normally open switches; the above-mentioned AC device can be selected as an AC power supply or an AC load, which will not be elaborated here.

[0039] Further, the switching control module 6 further includes a twelfth resistor R12, an eleventh resistor R11, a first relay K1, a tenth resistor R10, a first switching transistor VT1, a ninth resistor R9, a second switching transistor VT2, a second relay K2, and a third power supply VCC3.

[0040] Specifically, one end of the twelfth resistor R12 and one end of the eleventh resistor R11 are respectively connected to the eighth IO terminal and the tenth IO terminal of the first controller U1. The other end of the twelfth resistor R12 is connected to the base of the second switching transistor VT2 and grounded through the tenth resistor R10. The other end of the eleventh resistor R11 is connected to the base of the first switching transistor VT1 and grounded through the ninth resistor R9. The emitters of the first switching transistor VT1 and the second switching transistor VT2 are both grounded. The collectors of the first switching transistor VT1 and the second switching transistor VT2 are respectively connected to one end of the first relay K1 and one end of the second relay K2. The other ends of the first relay K1 and the second relay K2 are connected to the third power supply VCC3.

[0041] In a specific embodiment, both the above-mentioned first switching transistor VT1 and second switching transistor VT2 can be selected as NPN-type triodes to respectively control the operation of the first relay K1 and the second relay K2; the above-mentioned first relay K1 and second relay K2 are respectively used to control the working states of the above-mentioned first relay switch K1-1 and second relay switch K2-1, specifically controlled by magnetic attraction, which will not be elaborated here.

[0042] Further, the inverter control module 5 includes a first analog switch J1.

[0043] Specifically, the fourth terminal and the second terminal of the first analog switch J1 are respectively connected to the gate of the seventh power transistor Q7 and the gate of the fifth power transistor Q5. The ninth terminal and the eleventh terminal of the first analog switch J1 are respectively connected to the gate of the sixth power transistor Q6 and the gate of the eighth power transistor Q8. The fifth terminal and the twelfth terminal of the first analog switch J1 are both connected to the ninth IO terminal of the first controller U1. The thirteenth terminal and the sixth terminal of the first analog switch J1 are both connected to the tenth IO terminal of the first controller U1. The first terminal and the third terminal of the first analog switch J1 are both connected to the fifth IO terminal of the first controller U1. The eighth terminal and the tenth terminal of the first analog switch J1 are both connected to the sixth IO terminal of the first controller U1.

[0044] In a specific embodiment, the above-mentioned first analog switch J1 can be selected as a CD4066 chip, which is controlled by the first controller U1 to select the transmission path of the input pulse signal, so as to control the fifth power transistor Q5 and the sixth power transistor Q6 and the seventh power transistor Q7 and the eighth power transistor Q8.

[0045] Further, the inverter control module 5 further includes a second analog switch J2;

[0046] Specifically, the fourth terminal and the second terminal of the second analog switch J2 are respectively connected to the gate of the third power transistor Q3 and the gate of the fifth power transistor Q5. The eleventh terminal and the ninth terminal of the second analog switch J2 are respectively connected to the gate of the fourth power transistor Q4 and the gate of the sixth power transistor Q6. The first terminal and the third terminal of the second analog switch J2 are connected to the third IO terminal of the first controller U1. The eighth terminal and the tenth terminal of the second analog switch J2 are both connected to the fourth IO terminal of the first controller. The fifth terminal and the twelfth terminal of the second analog switch J2 are both connected to the seventh IO terminal of the first controller U1. The thirteenth terminal and the sixth terminal of the second analog switch J2 are both connected to the eighth IO terminal of the first controller U1.

[0047] In a specific embodiment, the above-mentioned second analog switch J2 can be selected as a CD4066 chip, which is controlled by the first controller U1 to select the transmission path of the input pulse signal, so as to control the fifth power transistor Q5 and the sixth power transistor Q6 and the third power transistor Q3 and the fourth power transistor Q4.

[0048] Further, the output detection module 8 includes a second resistor R2, a third resistor R3, a first power supply VCC1, a second power supply VCC2, a first transformer U2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a third capacitor C3, a first operational amplifier OP1, a seventh resistor R7, and an eighth resistor R8;

[0049] Specifically, the fourth terminal of the first transformer U2 is connected to the first terminal of the AC device through the second resistor R2, the fifth terminal of the first transformer U2 is connected to the second terminal of the AC device through the third resistor R3, the second terminal and the third terminal of the first transformer U2 are respectively connected to the first power supply VCC1 and the second power supply VCC2, the first terminal of the first transformer U2 is connected to one end of the sixth resistor R6 and one end of the fifth resistor R5 through the fourth resistor R4, the other end of the sixth resistor R6 is connected to the non-inverting terminal of the first operational amplifier OP1 and grounded through the third capacitor C3, the other end of the fifth resistor R5 is grounded, the inverting terminal of the first operational amplifier OP1 is connected to the output terminal of the first operational amplifier OP1 and one end of the eighth resistor R8 through the seventh resistor R7, and the other end of the eighth resistor R8 is connected to the eleventh IO terminal of the first controller U1.

[0050] In a specific embodiment, the above-mentioned first transformer U2 can be selected, but is not limited to, the LV28 voltage transformer; the above-mentioned first operational amplifier OP1 can be selected, but is not limited to, the TL082 operational amplifier.

[0051] A bidirectional energy storage inverter of the present invention controls the on-off of the first power transistor Q1 by the first controller U1 to improve the electric energy output by the energy storage device. At this time, the seventh IO terminal and the ninth IO terminal of the first controller U1 respectively control the operation of the second analog switch J2 and the first analog switch J1, so that the first controller U1 performs an inversion process through the full-bridge inverter circuit composed of the third power transistor Q3, the fourth power transistor Q4, the seventh power transistor Q7, and the eighth power transistor Q8 for transmission to the AC device. And the first transformer U2 detects the AC voltage input to the AC device, processes it by the first operational amplifier OP1 and transmits it to the first controller U1. If the first controller U1 determines that the detected AC voltage is abnormal at this time, the eighth IO terminal of the first controller U1 will control the operation of the second analog switch J2, so that the third power transistor Q3, the fourth power transistor Q4, the fifth power transistor Q5, and the sixth power transistor Q6 form a full-bridge inverter circuit and perform an inversion process, and at the same time control the second switch transistor VT2 to conduct and control the second relay switch K2-1 to close. If the output electric energy is still abnormal at this time, the tenth IO terminal of the first controller U1 will control the operation of the first analog switch J1, so that the fifth power transistor Q5, the sixth power transistor Q6, the seventh power transistor Q7, and the eighth power transistor Q8 form a full-bridge inverter circuit and perform an inversion process, and at the same time control the first switch transistor VT1 to conduct and control the first relay switch K1-1 to close to complete the output of AC electric energy. When the AC device provides AC electric energy, rectification is performed through the third power transistor Q3, the tenth power transistor, the seventh power transistor Q7, and the eighth power transistor Q8, and electric energy is provided for the energy storage device through the charge and discharge control module 2.

[0052] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0053] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A bidirectional energy storage inverter, characterized in that: The bidirectional energy storage inverter includes: an energy storage module, a charge and discharge control module, an intelligent control module, an inverter module, an inverter control module, a switching control module, an AC module, and an output detection module; The energy storage module is used to store the electric energy output by the charge and discharge control module and to output electric energy; The intelligent control module is used to receive the signal output by the output detection module, to output a first pulse signal and control the operation of the charge and discharge control module, to output a control signal and control the operation of the inverter control module and the switching control module, and to output a second pulse signal; The charge and discharge control module is connected to the energy storage module and the intelligent control module, and is used to control the charge and discharge control circuit to adjust the voltage of the electric energy output by the energy storage module and transmit it to the inverter module through the first pulse signal, and to control the charge and discharge control circuit to adjust the voltage of the electric energy output by the inverter module and input it into the energy storage module through the first pulse signal; The inverter control module is connected to the intelligent control module, and is used to control the analog switch circuit to select the path connected to the inverter module through the control signal, and to transmit the second pulse signal to the inverter module; The inverter module is connected to the charge and discharge control module and the inverter control module, and is used to receive the second pulse signal transmitted by the inverter control module, to invert the input DC electric energy and rectify the input AC electric energy through a full-bridge inverter circuit, and to control the power transistor circuit to access the full-bridge inverter circuit; The switching control module is connected to the AC module and the intelligent control module, and is used to receive the second pulse signal and control the connection state between the inverter module and the AC module through a relay switch circuit; The AC module is connected to the inverter module, and is used to receive the AC electric energy output by the inverter module and to provide AC electric energy for the inverter module; The output detection module is connected to the AC module and the intelligent control module, and is used to detect the AC electric energy input into the AC module and perform amplification and filtering processing on the detected signal, and to transmit the processed signal to the intelligent control module; The energy storage module includes an energy storage device; the charge and discharge control module includes a first capacitor, a first inductor, a first power transistor, a second power transistor, a first resistor, and a second capacitor; the intelligent control module includes a first controller; One end of the first capacitor and one end of the first inductor are connected to the first end of the energy storage device, the other end of the first inductor is connected to the emitter of the second power transistor and the collector of the first power transistor, the other end of the first capacitor, the second end of the energy storage device, and the emitter of the first power transistor are all grounded, the collector of the second power transistor is connected to one end of the first resistor and the first end of the second capacitor, the other end of the first resistor and the second end of the second resistor are both grounded, and the gates of the first power transistor and the second power transistor are respectively connected to the first IO terminal and the second IO terminal of the first controller.

2. The bidirectional energy storage inverter according to claim 1, characterized in that, The inverter module includes a third power transistor, a fourth power transistor, a fifth power transistor, a sixth power transistor, a seventh power transistor, and an eighth power transistor; The collector of the third power transistor is connected to the collector of the fifth power transistor, the collector of the seventh power transistor, and the first end of the second capacitor. The emitter of the third power transistor is connected to the collector of the fourth power transistor. The emitter of the fifth power transistor is connected to the collector of the sixth power transistor. The emitter of the seventh power transistor is connected to the collector of the eighth power transistor. The emitters of the fourth power transistor, the sixth power transistor, and the eighth power transistor are all grounded. The gates of the third power transistor, the fourth power transistor, the fifth power transistor, the sixth power transistor, the seventh power transistor, and the eighth power transistor are connected to the inverter control module.

3. The bidirectional energy storage inverter according to claim 2, characterized in that, The switching control module includes a first relay switch and a second relay switch; the AC module includes an AC device; The first end of the first relay switch is connected to the first end of the AC device and the emitter of the third power transistor. The first end of the second relay switch is connected to the second end of the AC device and the emitter of the seventh power transistor. The second end of the first relay switch is connected to the second end of the second relay switch and the emitter of the fifth power transistor.

4. The bidirectional energy storage inverter according to claim 3, characterized in that The switching control module further includes a twelfth resistor, an eleventh resistor, a first relay, a tenth resistor, a first switching transistor, a ninth resistor, a second switching transistor, a second relay, and a third power supply; One end of the twelfth resistor and one end of the eleventh resistor are respectively connected to the eighth IO terminal and the tenth IO terminal of the first controller. The other end of the twelfth resistor is connected to the base of the second switching transistor and grounded through the tenth resistor. The other end of the eleventh resistor is connected to the base of the first switching transistor and grounded through the ninth resistor. The emitters of the first switching transistor and the second switching transistor are both grounded. The collectors of the first switching transistor and the second switching transistor are respectively connected to one end of the first relay and one end of the second relay. The other ends of the first relay and the second relay are connected to the third power supply.

5. The bidirectional energy storage inverter according to claim 4, wherein The inverter control module includes a first analog switch; The fourth terminal and the second terminal of the first analog switch are respectively connected to the gate of the seventh power transistor and the gate of the fifth power transistor. The ninth terminal and the eleventh terminal of the first analog switch are respectively connected to the gate of the sixth power transistor and the gate of the eighth power transistor. The fifth terminal and the twelfth terminal of the first analog switch are both connected to the ninth IO terminal of the first controller. The thirteenth terminal and the sixth terminal of the first analog switch are both connected to the tenth IO terminal of the first controller. The first terminal and the third terminal of the first analog switch are both connected to the fifth IO terminal of the first controller. The eighth terminal and the tenth terminal of the first analog switch are both connected to the sixth IO terminal of the first controller.

6. The bidirectional energy storage inverter according to claim 5, characterized in that, The inverter control module further includes a second analog switch; The fourth terminal and the second terminal of the second analog switch are respectively connected to the gate of the third power transistor and the gate of the fifth power transistor. The eleventh terminal and the ninth terminal of the second analog switch are respectively connected to the gate of the fourth power transistor and the gate of the sixth power transistor. The first terminal and the third terminal of the second analog switch are connected to the third IO terminal of the first controller. The eighth terminal and the tenth terminal of the second analog switch are both connected to the fourth IO terminal of the first controller. The fifth terminal and the twelfth terminal of the second analog switch are both connected to the seventh IO terminal of the first controller. The thirteenth terminal and the sixth terminal of the second analog switch are both connected to the eighth IO terminal of the first controller.

7. A bidirectional energy storage inverter according to claim 6, characterized in that, The output detection module includes a second resistor, a third resistor, a first power supply, a second power supply, a first current transformer, a fourth resistor, a fifth resistor, a sixth resistor, a third capacitor, a first operational amplifier, a seventh resistor, and an eighth resistor; The fourth terminal of the first current transformer is connected to the first terminal of the AC device through the second resistor. The fifth terminal of the first current transformer is connected to the second terminal of the AC device through the third resistor. The second terminal and the third terminal of the first current transformer are respectively connected to the first power supply and the second power supply. The first terminal of the first current transformer is connected to one end of the sixth resistor and one end of the fifth resistor through the fourth resistor. The other end of the sixth resistor is connected to the non-inverting input terminal of the first operational amplifier and grounded through the third capacitor. The other end of the fifth resistor is grounded. The inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier and one end of the eighth resistor through the seventh resistor. The other end of the eighth resistor is connected to the eleventh IO terminal of the first controller.

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