Control method and control device of bidirectional charge and discharge circuit

Abstract

The application provides a control method and control device of a bidirectional charge-discharge circuit. The circuit comprises a first power conversion module and a second power conversion module; when the bidirectional charge-discharge circuit is in a charging mode, the second power conversion module is a master switch module and the first power conversion module is a slave switch module; when the bidirectional charge-discharge circuit is in a discharging mode, the first power conversion module is a master switch module and the second power conversion module is a slave switch module; the method comprises: controlling the master switch module to start slowly; when the master switch module starts slowly, according to the working mode of the bidirectional charge-discharge circuit and the current load, determining whether to control the slave switch module to start working; when it is determined to control the slave switch module to start working, according to the working mode of the bidirectional charge-discharge circuit, determining the retraction time of the slave switch module; and according to the retraction time, controlling the slave switch module to start slowly. The application can prevent the equipment from being damaged and ensure the stable and reliable working of the circuit.

Description

Technical Field

[0001] This invention relates to the field of rectification control technology, and in particular to a control method and control device for a bidirectional charging and discharging circuit. Background Technology

[0002] A bidirectional charging station system can include multiple bidirectional charging station modules. One end of each module is connected to the power grid, and the other end is connected to the electric vehicle's battery. The bidirectional charging station modules include DC-DC modules and DC-AC modules. To achieve bidirectional conversion, both the DC-DC and DC-AC modules typically employ bidirectional charging and discharging circuits.

[0003] Currently, the control of bidirectional charging and discharging circuits usually starts from the main switch module and the slave switch module simultaneously. However, this control method is prone to energy backflow in bidirectional circuits, which can lead to equipment damage. Summary of the Invention

[0004] This invention provides a control method and control device for a bidirectional charging and discharging circuit to solve the problem that the prior art is prone to energy backflow, which can lead to equipment damage.

[0005] In a first aspect, embodiments of the present invention provide a control method for a bidirectional charging and discharging circuit, the bidirectional charging and discharging circuit including a first power conversion module, a filter module, and a second power conversion module connected in sequence; when the bidirectional charging and discharging circuit is in charging mode, the second power conversion module is the master switch module and the first power conversion module is the slave switch module; when the bidirectional charging and discharging circuit is in discharging mode, the first power conversion module is the master switch module and the second power conversion module is the slave switch module.

[0006] The control methods for bidirectional charging and discharging circuits include:

[0007] Control the main switch module to start slowly; when the main switch module starts slowly, the slave switch module does not work.

[0008] After the main switch module has finished its slow start, determine whether to start working from the switch module based on the working mode of the bidirectional charging and discharging circuit and the current load.

[0009] When it is determined that the control starts working from the switching module, the indentation time of the drive signal from the switching module compared to the drive signal from the main switching module is determined according to the working mode of the bidirectional charging and discharging circuit.

[0010] The slave switch module is controlled to start slowly based on the duration of the indentation of the drive signal from the slave switch module compared to the drive signal from the master switch module.

[0011] In one possible implementation, the indentation time of the drive signal from the switching module compared to the drive signal from the main switching module is determined based on the operating mode of the bidirectional charging and discharging circuit, including:

[0012] If the bidirectional charging and discharging circuit operates in charging mode, then the indentation time of the drive signal from the switching module compared to the drive signal from the main switching module is determined based on the current power of the bidirectional charging and discharging circuit.

[0013] If the bidirectional charging and discharging circuit operates in discharging mode, then the duration of the indentation of the drive signal from the switching module compared to the drive signal from the main switching module is determined to be a first preset duration.

[0014] In one possible implementation, the indentation duration of the drive signal from the switching module relative to the drive signal from the main switching module is determined based on the current power of the bidirectional charging and discharging circuit, including:

[0015] Based on the correspondence between power and retraction time, the retraction time corresponding to the current power of the bidirectional charging and discharging circuit is determined, which is used as the retraction time of the drive signal of the slave switch module compared to the drive signal of the master switch module.

[0016] In one possible implementation, the process of determining the correspondence between the power and the inward contraction duration includes:

[0017] Acquire test data; the test data includes multiple preset power values ​​of the bidirectional charging and discharging circuit and the retraction time values ​​that are respectively matched with the multiple preset power values ​​when the bidirectional charging and discharging circuit is in charging mode.

[0018] The experimental data were fitted to obtain the relationship between power and inward contraction time.

[0019] In one possible implementation, determining whether to control the switching module to start working, based on the operating mode of the bidirectional charging / discharging circuit and the current load, includes:

[0020] If the bidirectional charging and discharging circuit operates in charging mode, then when the current load of the bidirectional charging and discharging circuit is greater than the first preset load, the control starts working from the switching module.

[0021] If the bidirectional charging and discharging circuit operates in discharging mode, then when the current load of the bidirectional charging and discharging circuit is greater than the second preset load, the control starts working from the switching module.

[0022] The first preset load is greater than the second preset load.

[0023] In one possible implementation, controlling the slow start of the slave switch module based on the indentation duration of the drive signal from the slave switch module compared to the drive signal from the master switch module includes:

[0024] The duty cycle of the slave switch module is gradually adjusted from zero to a preset duty cycle using a slow start method. The preset duty cycle is D2 = D1 - 2T1 / T, where D1 is the duty cycle of the master switch module, T1 is the indentation time of the slave switch module's drive signal compared to the master switch module's drive signal, and T is the duration of one working cycle.

[0025] In one possible implementation, after the control is initiated softly from the switching module, the control method for the bidirectional charging and discharging circuit further includes:

[0026] Based on the operating mode of the bidirectional charging and discharging circuit and the current load, determine whether to control the switching module to stop working.

[0027] In one possible implementation, determining whether to control the switching module to stop operating, based on the operating mode of the bidirectional charging / discharging circuit and the current load, includes:

[0028] If the bidirectional charging and discharging circuit operates in charging mode, then when the current load of the bidirectional charging and discharging circuit is less than the third preset load, the control switch module will stop working.

[0029] If the bidirectional charging and discharging circuit operates in discharging mode, then when the current load of the bidirectional charging and discharging circuit is less than the fourth preset load, the control switch module will stop working.

[0030] The third preset load is greater than the fourth preset load.

[0031] In one possible implementation, controlling the main switch module to start softly includes:

[0032] The operating frequency of the main switch module is gradually adjusted from the first preset frequency to the second preset frequency using a frequency-gradual start method.

[0033] The first preset frequency is greater than the second preset frequency.

[0034] In a second aspect, embodiments of the present invention provide a control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the control method for the bidirectional charging and discharging circuit as described in the first aspect or any possible implementation thereof.

[0035] Thirdly, embodiments of the present invention provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the control method for the bidirectional charging and discharging circuit as described in the first aspect or any possible implementation thereof.

[0036] This invention provides a control method and device for a bidirectional charging and discharging circuit. The method includes controlling the main switch module to start slowly, and after the main switch module starts slowly, determining whether to control the slave switch module to start working based on the operating mode of the bidirectional charging and discharging circuit and the current load. When it is determined that the slave switch module should start working, the method determines the indentation time of the slave switch module's drive signal compared to the main switch module's drive signal based on the operating mode of the bidirectional charging and discharging circuit, and controls the slave switch module to start slowly based on this indentation time. This invention does not simultaneously control the main switch module and the slave switch module; instead, after the main switch module starts slowly, it determines whether to control the slave switch module based on the operating mode and the current load, calculates the indentation time, and controls the slave switch module to start slowly based on the indentation time. This effectively solves the problem of energy backflow, prevents equipment damage, and ensures stable and reliable circuit operation. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a flowchart illustrating the implementation of the control method for the bidirectional charging and discharging circuit provided in an embodiment of the present invention.

[0039] Figure 2 This is a schematic diagram of the bidirectional charging and discharging circuit provided in an embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram illustrating the correspondence between power and retraction duration provided in an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the drive signals sent to each switching transistor when the bidirectional charging and discharging circuit is in charging mode, as provided in an embodiment of the present invention.

[0042] Figure 5 This is a flowchart illustrating the control method of the bidirectional charging and discharging circuit when it is in charging mode, as provided in an embodiment of the present invention.

[0043] Figure 6 This is a schematic diagram of the structure of the control device for the bidirectional charging and discharging circuit provided in an embodiment of the present invention;

[0044] Figure 7 This is a schematic diagram of the control device provided in an embodiment of the present invention. Detailed Implementation

[0045] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0046] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0047] In a unidirectional charging circuit, a controllable switching transistor is used on the primary side, while an uncontrolled diode is used on the secondary side, thus eliminating the need for synchronous rectifier control. However, in a bidirectional charging / discharging circuit, to achieve bidirectional energy flow, both the primary and secondary sides use controllable switching transistors. Because the forward voltage drop of the diode connected in parallel with the controllable switching transistor is relatively large, significant conduction losses occur when a large current flows through the diode, causing severe overheating and even damage to the switching transistor. Therefore, it is necessary to control the switching transistor to turn on as early as possible to manage the conduction losses on the diode. However, if the switching transistor turns on before the diode, it can easily lead to energy backflow, affecting the circuit characteristics of the bidirectional charging / discharging circuit. This can cause hard switching in the main switch (i.e., the switching transistor in the main switching module), resulting in severe overheating and even damage to the high-frequency operating main switch. Therefore, in a bidirectional charging circuit, controlling the synchronous rectifier (i.e., the switching transistor in the secondary switching module, which can be simply referred to as the synchronous transistor) is particularly important.

[0048] There are three traditional synchronous rectification control methods:

[0049] 1. A current transformer is used to detect the inductor current on the secondary side of the bidirectional charging and discharging circuit, and the switching on and off of the synchronous rectifier diode is controlled based on the current magnitude. This control scheme can accurately detect the inductor current, and thus accurately determine the timing of the synchronous rectifier diode's switching on and off. However, for a bidirectional charging and discharging circuit, which can operate in both directions, the position of the synchronous rectifier diode differs for each direction of operation. Therefore, a current transformer is required for each current path, which occupies a significant amount of space. High-power-density charging and discharging circuits have limited internal space, making this scheme unsuitable for most applications.

[0050] 2. In low-voltage, high-current applications, synchronous rectification detection chips are relatively mature, typically determining the turn-on and turn-off times of the switching transistor by detecting the voltage across the diode's drain and source terminals (DS). The bidirectional charge / discharge circuit operates with a DC voltage range of 200-950V for the discharge direction and 150-950V for the charging direction, providing a wide voltage detection range. Furthermore, the bidirectional charge / discharge circuit has a controllable current range of 2-100A, also a wide current range. However, current synchronous rectification detection chips cannot meet such wide voltage and current detection accuracy requirements, especially in high-voltage, low-current applications, where they are insufficient for the needs of bidirectional charge / discharge circuits.

[0051] 3. The synchronous transistor and the main tube are turned on and off simultaneously by software control, with a fixed retraction time for the synchronous transistor. Under light load conditions, the synchronous transistor may turn on before its anti-parallel diode, leading to energy backflow. This affects the circuit characteristics of the bidirectional charging and discharging circuit, causing hard switching in the main tube drive, resulting in severe overheating or even damage to the main tube operating at high frequencies.

[0052] To address the aforementioned problems, this invention proposes a control method for a bidirectional charging and discharging circuit to solve these issues.

[0053] See Figure 1 The diagram illustrates a flowchart of the control method for a bidirectional charging and discharging circuit provided in an embodiment of the present invention. The execution entity of the control method for the bidirectional charging and discharging circuit can be a control device, which can be a controller.

[0054] See Figure 2 The bidirectional charging and discharging circuit includes a first power conversion module 21, a filter module 23, and a second power conversion module 22 connected in sequence. When the bidirectional charging and discharging circuit is in charging mode, the second power conversion module 22 is the master switch module and the first power conversion module 21 is the slave switch module. When the bidirectional charging and discharging circuit is in discharging mode, the first power conversion module 21 is the master switch module and the second power conversion module 22 is the slave switch module.

[0055] The first power conversion module 21 is used to connect to the first power source, and the second power conversion module 22 is used to connect to the second power source. When the bidirectional charging and discharging circuit is in charging mode, the second power source charges the first power source through the bidirectional charging and discharging circuit. When the bidirectional charging and discharging circuit is in discharging mode, the first power source discharges to the second power source through the bidirectional charging and discharging circuit.

[0056] When the bidirectional charging and discharging circuit is in charging mode, the second power conversion module 22 acts as an inverter module, converting DC power to AC power, while the first power conversion module 21 acts as a rectifier module, converting AC power to DC power. When the bidirectional charging and discharging circuit is in discharging mode, the first power conversion module 21 acts as an inverter module, converting DC power to AC power, while the second power conversion module 22 acts as a rectifier module, converting AC power to DC power.

[0057] In one possible implementation, the first power conversion module includes a first full-bridge controllable circuit;

[0058] The second power conversion module includes a second full-bridge controllable circuit;

[0059] The filtering module includes LLC circuits or CLLC circuits.

[0060] In this embodiment, the first power conversion module can be Figure 2 The first full-bridge controllable circuit is shown. The second power conversion module can be... Figure 2 The second full-bridge controllable circuit is shown. The bidirectional charging and discharging circuit can be an LLC topology or a CLLC topology, etc.

[0061] See Figure 1 The control method for the above-mentioned bidirectional charging and discharging circuit includes:

[0062] In S101, the main switch module is controlled to start slowly; when the main switch module starts slowly, the slave switch module does not work.

[0063] In this embodiment, when it is necessary to control the bidirectional charging and discharging circuit to start working, that is, when the drive enable signal of the bidirectional charging and discharging circuit is received, the main switch module is first controlled to start slowly. At this time, the slave switch module does not work.

[0064] The control module for slow start-up involves controlling the slow start-up of each switch within it. Each switch in the main switch module can be called a main switch or master switch. Similarly, each switch in the slave switch module can be called a synchronizing switch, synchronizing rectifier switch, or slave switch.

[0065] Under light load, the current flowing through the diode in the switching module is small, and the conduction loss is small. Therefore, the switching module does not need to work under light load.

[0066] In some embodiments, S101 may include:

[0067] The operating frequency of the main switch module is gradually adjusted from the first preset frequency to the second preset frequency using a frequency-gradual start method.

[0068] The first preset frequency is greater than the second preset frequency.

[0069] There are two methods for the main switch module to start softly: duty cycle soft start and frequency soft start. In duty cycle soft start, the main switch duty cycle gradually increases. At low duty cycles, hard switching of the main switch is severe, easily damaging the switching transistor. Therefore, this embodiment uses frequency soft start, allowing the main switch to gradually start from a first preset frequency to a second preset frequency for normal operation. During the main switch soft start process, the synchronizing transistor does not operate.

[0070] The first preset frequency and the second preset frequency can be set according to actual needs.

[0071] In one possible implementation, the bidirectional charging and discharging circuit can be a bidirectional resonant circuit, such as an LLC topology or a CLLC topology. The first preset frequency can be the maximum operating frequency of the bidirectional resonant circuit, and the second preset frequency can be the resonant frequency of the bidirectional resonant circuit. For example, the first preset frequency can be 500kHz, and the second preset frequency can be 120kHz.

[0072] In one possible implementation, a fixed dead time and frequency-based soft-start method can be used to control the main switch module to start slowly. The dead time prevents simultaneous conduction of switches on the same bridge arm, thus preventing short circuits.

[0073] In S102, after the main switch module is slowly started, it is determined whether to start the switch module to work based on the working mode of the bidirectional charging and discharging circuit and the current load.

[0074] Once the main switch module has completed its soft start, the system determines whether to control the switch module to start working based on the current operating mode and load of the bidirectional charging and discharging circuit.

[0075] The bidirectional charging and discharging circuit operates in either charging or discharging mode. The load capacity of the bidirectional charging and discharging circuit refers to its total power output.

[0076] The soft switching behavior of the circuit varies under different charging modes and different loads. The load judgment point for turning on and off the synchronous rectifier tube under different working modes can be determined based on the measured data, and sufficient margin can be left to prevent the synchronous rectifier tube from repeatedly turning on and off.

[0077] In some embodiments, the "determining whether to control the switching module to start working based on the operating mode of the bidirectional charging and discharging circuit and the current load" in S102 above may include:

[0078] If the bidirectional charging and discharging circuit operates in charging mode, then when the current load of the bidirectional charging and discharging circuit is greater than the first preset load, the control starts working from the switching module.

[0079] If the bidirectional charging and discharging circuit operates in discharging mode, then when the current load of the bidirectional charging and discharging circuit is greater than the second preset load, the control starts working from the switching module.

[0080] The first preset load is greater than the second preset load.

[0081] For a bidirectional charging and discharging circuit, when it is in charging mode, if its current load (i.e., overall efficiency) is greater than the first preset load, the control starts working from the switching module, that is, the synchronous rectifier is turned on; when it is in discharging mode, if its current load is greater than the second preset load, the control starts working from the switching module, that is, the synchronous rectifier is turned on.

[0082] The first and second preset load values ​​can be set according to actual needs.

[0083] In one possible implementation, the first preset load capacity can be 14kVA, and the second preset load capacity can be 9kVA.

[0084] In S103, when it is determined that the control starts working from the switch module, the indentation time of the drive signal from the switch module compared to the drive signal from the main switch module is determined according to the operating mode of the bidirectional charging and discharging circuit.

[0085] Each master switch in the main switch module refers to a controllable switch that operates actively. The master switch is a controllable switch and is controlled by a drive signal. The entire circuit can only operate after the master switch starts working under the drive signal. The slave switches in the slave switch module operate passively compared to the master switches. The drive of the master switch is a prerequisite, and the drive of the corresponding slave switch follows. Therefore, each slave switch in the slave switch module of this application must follow the corresponding master switch in the main switch module.

[0086] To improve circuit reliability, this application, after both the main switch module and the slave switch module are started, controls each synchronization transistor in the slave switch module to turn on later and off earlier than the corresponding main switch transistor in the main switch module during each operating cycle. During this period of delayed on / off switching, i.e., when the main switch transistor is on and the synchronization transistor is off, the slave switch module can rectify current through the body diodes of each synchronization transistor.

[0087] Within a working cycle, the duration by which the synchronizing tube is turned on later and earlier than the main tube at the corresponding position is equal. This duration is the inward contraction time of the drive signal from the slave switching module compared to the drive signal from the master switching module.

[0088] The corresponding main tube in the switching module refers to the switching tube located in the same position within its module. Figure 2 For example, all are located on the upper tubes of the left bridge arm of the module, i.e., switching tubes G1 and G5 are the corresponding switching tubes; all are located on the lower tubes of the left bridge arm of the module, i.e., switching tubes G3 and G7 are the corresponding switching tubes; all are located on the upper tubes of the right bridge arm of the module, i.e., switching tubes G2 and G6 are the corresponding switching tubes; all are located on the lower tubes of the right bridge arm of the module, i.e., switching tubes G4 and G8 are the corresponding switching tubes.

[0089] In this embodiment, when it is determined that the operation of the switch module needs to be controlled, the duration of the indentation of the drive signal of the switch module compared with the drive signal of the main switch module can be determined according to the operating mode of the bidirectional charging and discharging circuit.

[0090] In some embodiments, the step of "determining the indentation duration of the drive signal from the switching module relative to the drive signal from the main switching module according to the operating mode of the bidirectional charging and discharging circuit" in S103 above may include:

[0091] If the bidirectional charging and discharging circuit operates in charging mode, then the indentation time of the drive signal from the switching module compared to the drive signal from the main switching module is determined based on the current power of the bidirectional charging and discharging circuit.

[0092] If the bidirectional charging and discharging circuit operates in discharging mode, then the duration of the indentation of the drive signal from the switching module compared to the drive signal from the main switching module is determined to be a first preset duration.

[0093] In some embodiments, determining the indentation duration of the drive signal from the switching module relative to the drive signal from the main switching module based on the current power of the bidirectional charging and discharging circuit includes:

[0094] Based on the correlation between power and retraction time, the retraction time corresponding to the current power of the bidirectional charge-discharge circuit is determined, serving as the retraction time of the drive signal from the slave switch module compared to the drive signal from the master switch module. The bidirectional charge-discharge circuit operates at its resonant frequency. Hardware characteristics dictate that the larger the load, the smaller the phase difference between the zero-crossing points of the primary and secondary currents. Therefore, it is necessary to control the retraction time of the synchronous rectification (i.e., the retraction time of the drive signal from the slave switch module compared to the drive signal from the master switch module) to be as small as possible.

[0095] Based on measured data, in discharge mode, the shortening time of synchronous rectification to the first preset time is sufficient to meet the requirements of the entire power range. The first preset time can be obtained through testing based on actual needs; in one possible implementation, the first preset time is 550ns.

[0096] However, in charging mode, the charging and discharging direction needs to be linearly controlled to adjust the inward contraction time in order to meet the requirements.

[0097] In some embodiments, the process of determining the correspondence between the power and the retraction duration includes:

[0098] Acquire test data; the test data includes multiple preset power values ​​of the bidirectional charging and discharging circuit and the retraction time values ​​that are respectively matched with the multiple preset power values ​​when the bidirectional charging and discharging circuit is in charging mode.

[0099] The experimental data were fitted to obtain the relationship between power and inward contraction time.

[0100] In this embodiment, the bidirectional charge-discharge circuit in charging mode can be tested to obtain test data. Specifically, multiple preset power values ​​can be set, and the power of the bidirectional charge-discharge circuit can be controlled sequentially to each preset power value. When the power of the bidirectional charge-discharge circuit is a certain preset power value, the shrinkage time is controlled to start from 0 and gradually increase at fixed intervals until the shrinkage time value matching the preset power value is obtained. The shrinkage time value matching the preset power value can be the shortest shrinkage time value that will not cause energy backflow under the preset power value, or it can be any shrinkage time value that will not cause energy backflow under the preset power value. The fixed interval can be set according to actual needs, for example, it can be 1 ns.

[0101] For example, some of the data in the test data can be shown in Table 1.

[0102] Table 1 Experimental Data

[0103]

[0104] By fitting the experimental data, a fitting curve can be obtained, as shown in the figure below. Figure 3 As shown, the inward contraction duration is limited to 600ns-900ns. Figure 3 The power displayed is the total power of the device, which is also the load capacity mentioned above. In charging mode, according to... Figure 3 The curve shown represents the relationship between power and shrinkage time. It can be used to determine the shrinkage time corresponding to the current power, which is the shrinkage time of the drive signal from the switch module compared to the drive signal from the main switch module in charging mode.

[0105] The unit of power is W, and the unit of contraction time is ns.

[0106] The relationship between power and inward contraction time can be expressed by the formula:

[0107]

[0108] Where y is the inward contraction duration and x is the power.

[0109] In S104, the slave switch module is controlled to start slowly based on the indentation time of the drive signal from the slave switch module compared to the drive signal from the master switch module.

[0110] In this embodiment, when it is determined that the switch module needs to be started, the switch module is controlled to start slowly according to the previously determined indentation duration.

[0111] In some embodiments, S104 may include:

[0112] The duty cycle of the slave switch module is gradually adjusted from zero to a preset duty cycle using a slow start method. The preset duty cycle is D2 = D1 - 2T1 / T, where D1 is the duty cycle of the master switch module, T1 is the indentation time of the slave switch module's drive signal compared to the master switch module's drive signal, and T is the duration of one working cycle.

[0113] In this embodiment, the synchronous rectifier is only turned on when the load is large. Therefore, the duty cycle of the synchronous rectifier is large when it is turned on. If the synchronous rectifier is driven directly with a large duty cycle, a large resonant cavity current will be generated, which may lead to damage. Therefore, a duty cycle slow-start method is used when the synchronous rectifier is turned on.

[0114] After the slave switch module completes its soft start, within each working cycle, each synchronization transistor in the slave switch module opens later and closes earlier than the corresponding main transistor in the master switch module. The duration of the delayed opening and the duration of the earlier closing are the aforementioned determined recess duration. When in charging mode, this can be determined according to... Figure 3 The corresponding relationship is determined based on the real-time load, and the real-time shrinkage duration is not specifically limited here.

[0115] In some embodiments, after S104, the control method for the bidirectional charging and discharging circuit further includes:

[0116] Based on the operating mode of the bidirectional charging and discharging circuit and the current load, determine whether to control the switching module to stop working.

[0117] Since the synchronizing transistor does not need to be turned on under light load, the timing for turning it off can be determined based on the real-time load after the switch module has started softly. However, the load threshold for turning it off differs depending on the operating mode.

[0118] In some embodiments, determining whether to control the switching module to stop operating based on the operating mode of the bidirectional charging and discharging circuit and the current load includes:

[0119] If the bidirectional charging and discharging circuit operates in charging mode, then when the current load of the bidirectional charging and discharging circuit is less than the third preset load, the control switch module will stop working.

[0120] If the bidirectional charging and discharging circuit operates in discharging mode, then when the current load of the bidirectional charging and discharging circuit is less than the fourth preset load, the control switch module will stop working.

[0121] The third preset load is greater than the fourth preset load.

[0122] This embodiment can determine when the switching module starts working and when it stops working based on the operating mode of the bidirectional charging and discharging circuit and the real-time load.

[0123] When the bidirectional charging and discharging circuit is in charging mode, if the current load of the bidirectional charging and discharging circuit is greater than the first preset load, the control switch module starts working. After the control switch module starts working, when the current load of the bidirectional charging and discharging circuit is less than the third preset load, the control switch module stops working. The load size can be monitored in real time, and the above process can be repeated.

[0124] When the bidirectional charging and discharging circuit is in the discharging mode, if the current load of the bidirectional charging and discharging circuit is greater than the second preset load, the control switch module starts to work. After the control switch module starts to work, when the current load of the bidirectional charging and discharging circuit is less than the fourth preset load, the control switch module stops working. The load size can be monitored in real time, and the above process can be repeated.

[0125] The third and fourth preset load values ​​can be set according to actual needs.

[0126] In one possible implementation, the third preset load capacity can be 11kVA, and the second preset load capacity can be 7kVA.

[0127] It should be noted that the slow start control of the main switch module described in this embodiment does not mean that all main switches are turned on simultaneously; it only means that drive signals are sent to each main switch, and the drive signals sent to each main switch may be different. Similarly, the slow start control of the slave switch module does not mean that all synchronization transistors are turned on simultaneously; it only means that drive signals are sent to each synchronization transistor, and the slow start control stops sending drive signals to each synchronization transistor when the slave switch module stops working.

[0128] by Figure 2 For example, the first power conversion module 21 includes four switching transistors, namely switching transistors G1, G2, G3 and G4. The second power conversion module 22 includes four switching transistors, namely switching transistors G5, G6, G7 and G8.

[0129] When both the master and slave switching modules of the bidirectional charging and discharging circuit are operating, the drive signals of switching transistors G1 and G4 in the first power conversion module 21 are the same, i.e., they are both on and off simultaneously; the drive signals of switching transistors G2 and G3 in the first power conversion module 21 are also the same, i.e., they are both on and off simultaneously; the drive signals of the first switching transistors on the same bridge arm can be complementary. For example, the drive signals of switching transistors G1 and G3 can be complementary, i.e., when switching transistor G1 is on, switching transistor G3 is off, and when switching transistor G1 is off, switching transistor G3 is on; the same applies to switching transistors G2 and G4, which will not be elaborated further. Of course, depending on actual needs, the drive signals of the switching transistors on the same bridge arm can also be non-complementary, and no specific restrictions are imposed here.

[0130] Similarly, the drive signals for switches G5 and G8 in the second power conversion module 22 are the same, i.e., they are both on and both off; the drive signals for switches G6 and G7 in the second power conversion module 22 are also the same, i.e., they are both on and both off; the drive signals for the second switches on the same bridge arm can be complementary. For example, the drive signals for switches G5 and G7 can be complementary, i.e., when switch G5 is on, switch G7 is off, and when switch G5 is off, switch G7 is on; the same applies to switches G6 and G8, which will not be elaborated further. Of course, depending on actual needs, the drive signals for switches on the same bridge arm can also be non-complementary, and no specific restrictions are imposed here.

[0131] To prevent the two first switches on the same bridge arm from conducting simultaneously, a certain dead time can be set.

[0132] When the bidirectional charging and discharging circuit is in charging mode, the drive signals for each switching transistor can be found in [reference needed]. Figure 4 As shown. At this time, the duty cycle of the drive signal of each switch in the second power conversion module 22 is 50% (no dead time is set), and the duty cycle of the drive signal of each switch in the first power conversion module 22 is less than 50%, which is 50%-2T1 / T. Figure 4 T1 is shown in the figure.

[0133] In one possible implementation, the switching transistors in the first power conversion module 21 and the second power conversion module 22 can be MOS (MOSFET, metal-oxide-semiconductor field-effect transistor) transistors or IGBT (Insulated Gate Bipolar Transistor) modules.

[0134] In one possible implementation, the first power source is a DC power source, and the second power source is an AC power source;

[0135] The second power conversion module 22 is used to connect to the second power source via the inverter module.

[0136] In this embodiment, when applied to a bidirectional charging pile system, the first power source is a DC power source, such as a battery, and the second power source is an AC power source, such as an AC power grid.

[0137] When the second power source is an AC power source, the second power conversion module 22 needs to be connected to the second power source through an inverter module (e.g., an inverter).

[0138] In one possible implementation, the first power source is a DC power source, and the second power source is also a DC power source;

[0139] The first power conversion module 21 is connected to the first power supply, and the second power conversion module 22 is connected to the second power supply.

[0140] The following section uses the charging mode as an example to detail the control process of the bidirectional charging and discharging circuit control method provided in this application. The flow is as follows: Figure 5 As shown.

[0141] 1) Check if the drive enable of the bidirectional charging and discharging circuit is TRUE, that is, whether the drive enable signal of the bidirectional charging and discharging circuit is received; if yes, then execute 2); otherwise, do not perform any operation and keep the synchronous tube in the off state.

[0142] 2) Determine whether the bidirectional charging and discharging circuit is in charging mode; if yes, proceed to 3); otherwise, if it is in discharging mode, proceed to the steps corresponding to the discharging mode.

[0143] 3) At this time, the master driver enable = TRUE, which controls the main switch module frequency to start slowly.

[0144] 4) Determine if the main switch module has completed its slow start. If yes, proceed to step 5); otherwise, continue with step 4.

[0145] 5) Determine if the current load of the bidirectional charging and discharging module is greater than 14KVA; if yes, proceed to 6); otherwise, continue to keep the synchronous tube off.

[0146] 6) At this time, synchronous rectification enable = TRUE, calculate the synchronous rectification indentation time.

[0147] 7) At this time, the synchronous tube drive enable = TRUE.

[0148] 8) Control the duty cycle of the synchro tube to start slowly.

[0149] 9) If the current load of the bidirectional charging and discharging module is less than 11KVA, the control synchronization tube is turned off.

[0150] As described above, the embodiments of the present invention do not simultaneously control the main switch module and the slave switch module. Instead, after controlling the main switch module to start slowly, the control of whether to start the slave switch module is determined based on the working mode and the current load. The retraction time is calculated, and the slave switch module is controlled to start slowly based on the retraction time. This can effectively solve the problem of energy backflow, prevent equipment damage, and ensure stable and reliable circuit operation.

[0151] This embodiment determines the turn-on and turn-off times of the synchronous rectifier tube based on the load and calculates the corresponding synchronous rectifier tube drive retraction time, ensuring stable and reliable synchronous rectification and improving overall efficiency. Furthermore, it eliminates the need for inductors and transformers, minimizing resource consumption and saving module space.

[0152] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0153] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0154] Figure 6 A schematic diagram of the control device for the bidirectional charging and discharging circuit provided in an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below:

[0155] like Figure 6 As shown, the control device 30 of the bidirectional charging and discharging circuit is applied to the bidirectional charging and discharging circuit, which includes a first power conversion module, a filter module, and a second power conversion module connected in sequence. When the bidirectional charging and discharging circuit is in charging mode, the second power conversion module is the master switch module and the first power conversion module is the slave switch module. When the bidirectional charging and discharging circuit is in discharging mode, the first power conversion module is the master switch module and the second power conversion module is the slave switch module.

[0156] The control device 30 for the bidirectional charging and discharging circuit includes: a first slow-start module 31, a first judgment module 32, an inward shrinkage duration determination module 33, and a second slow-start module 34.

[0157] The first slow-start module 31 is used to control the slow start of the main switch module; wherein, when the main switch module is slow-started, the slave switch module does not work.

[0158] The first judgment module 32 is used to determine whether to control the switch module to start working after the main switch module has finished slow-starting, based on the working mode of the bidirectional charging and discharging circuit and the current load.

[0159] The shrinkage duration determination module 33 is used to determine the shrinkage duration of the drive signal of the slave switch module compared with the drive signal of the master switch module according to the working mode of the bidirectional charging and discharging circuit when the control starts to work from the switch module.

[0160] The second soft-start module 34 is used to control the soft start of the slave switch module based on the indentation time of the drive signal of the slave switch module compared with the drive signal of the master switch module.

[0161] In one possible implementation, the indentation duration determination module 33 is specifically used for:

[0162] If the bidirectional charging and discharging circuit operates in charging mode, then the indentation time of the drive signal from the switching module compared to the drive signal from the main switching module is determined based on the current power of the bidirectional charging and discharging circuit.

[0163] If the bidirectional charging and discharging circuit operates in discharging mode, then the duration of the indentation of the drive signal from the switching module compared to the drive signal from the main switching module is determined to be a first preset duration.

[0164] In one possible implementation, the indentation duration determination module 33 is specifically used for:

[0165] Based on the correspondence between power and retraction time, the retraction time corresponding to the current power of the bidirectional charging and discharging circuit is determined, which is used as the retraction time of the drive signal of the slave switch module compared to the drive signal of the master switch module.

[0166] In one possible implementation, the process of determining the correspondence between the power and the inward contraction duration includes:

[0167] Acquire test data; the test data includes multiple preset power values ​​of the bidirectional charging and discharging circuit and the retraction time values ​​that are respectively matched with the multiple preset power values ​​when the bidirectional charging and discharging circuit is in charging mode.

[0168] The experimental data were fitted to obtain the relationship between power and inward contraction time.

[0169] In one possible implementation, the first judgment module 32 is specifically used for:

[0170] If the bidirectional charging and discharging circuit operates in charging mode, then when the current load of the bidirectional charging and discharging circuit is greater than the first preset load, the control starts working from the switching module.

[0171] If the bidirectional charging and discharging circuit operates in discharging mode, then when the current load of the bidirectional charging and discharging circuit is greater than the second preset load, the control starts working from the switching module.

[0172] The first preset load is greater than the second preset load.

[0173] In one possible implementation, the second easing module 34 is specifically used for:

[0174] The duty cycle of the slave switch module is gradually adjusted from zero to a preset duty cycle using a slow start method. The preset duty cycle is D2 = D1 - 2T1 / T, where D1 is the duty cycle of the master switch module, T1 is the indentation time of the slave switch module's drive signal compared to the master switch module's drive signal, and T is the duration of one working cycle.

[0175] In one possible implementation, the control device for the bidirectional charging and discharging circuit further includes a second judgment module.

[0176] The second judgment module is used to determine whether to control the switch module to stop working based on the operating mode of the bidirectional charging and discharging circuit and the current load.

[0177] In one possible implementation, the second judgment module is specifically used for:

[0178] If the bidirectional charging and discharging circuit operates in charging mode, then when the current load of the bidirectional charging and discharging circuit is less than the third preset load, the control switch module will stop working.

[0179] If the bidirectional charging and discharging circuit operates in discharging mode, then when the current load of the bidirectional charging and discharging circuit is less than the fourth preset load, the control switch module will stop working.

[0180] The third preset load is greater than the fourth preset load.

[0181] In one possible implementation, the first easing module 31 is specifically used for:

[0182] The operating frequency of the main switch module is gradually adjusted from the first preset frequency to the second preset frequency using a frequency-gradual start method.

[0183] The first preset frequency is greater than the second preset frequency.

[0184] Figure 7 This is a schematic diagram of the control device provided in an embodiment of the present invention. Figure 7 As shown, the control device 4 in this embodiment includes: a processor 40, a memory 41, and a computer program 42 stored in the memory 41 and executable on the processor 40. When the processor 40 executes the computer program 42, it implements the steps in the control method embodiments of the various bidirectional charging and discharging circuits described above, for example... Figure 1 S101 to S104 are shown. Alternatively, when the processor 40 executes the computer program 42, it implements the functions of each module / unit in the above-described device embodiments, for example... Figure 6 The functions of modules / units 31 to 34 shown.

[0185] For example, the computer program 42 can be divided into one or more modules / units, which are stored in the memory 41 and executed by the processor 40 to complete the present invention. The one or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 42 in the control device 4. For example, the computer program 42 can be divided into... Figure 6 Modules / units 31 to 34 are shown.

[0186] The control device 4 can be a controller, or a computing device such as a desktop computer, laptop, handheld computer, or cloud server. The control device 4 may include, but is not limited to, a processor 40 and a memory 41. Those skilled in the art will understand that... Figure 7 This is merely an example of control device 4 and does not constitute a limitation on control device 4. It may include more or fewer components than shown, or combine certain components, or different components. For example, the control device may also include input / output devices, network access devices, buses, etc.

[0187] The processor 40 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0188] The memory 41 can be an internal storage unit of the control device 4, such as a hard disk or memory of the control device 4. The memory 41 can also be an external storage device of the control device 4, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the control device 4. Furthermore, the memory 41 can include both internal and external storage units of the control device 4. The memory 41 is used to store the computer program and other programs and data required by the control device. The memory 41 can also be used to temporarily store data that has been output or will be output.

[0189] This embodiment also provides a bidirectional charging and discharging circuit, see [link]. Figure 2 The circuit includes a first power conversion module 21, a filter module 23, and a second power conversion module 22 connected in sequence; the circuit also includes the control device 4 as described above.

[0190] Both the first power conversion module 21 and the second power conversion module 22 are controlled by the control device 4.

[0191] In one possible implementation, the first power conversion module 21 is used to connect to the first power supply, and the second power conversion module 22 is used to connect to the second power supply.

[0192] The specific structures of the first power conversion module 21 and the second power conversion module 22 can be referred to the relevant descriptions in the aforementioned methods, and will not be repeated here.

[0193] In one possible implementation, the filter module 23 includes a first transformer T1, a second transformer T2, and a resonant unit 23;

[0194] The first winding of the first transformer T1 and the first winding of the second transformer T2 are connected in series, and the second winding of the first transformer T1 and the second winding of the second transformer T2 are connected in parallel.

[0195] The first winding of the first transformer T1 and the first winding of the second transformer T2 are connected in series and then connected to the first power conversion module 21.

[0196] The second winding of the first transformer T1 and the second winding of the second transformer T2 are both connected to the second power conversion module 22 through the resonant unit 24.

[0197] In one possible implementation, the resonant unit 24 includes a resonant inductor L and a resonant capacitor C3.

[0198] The bidirectional charging and discharging circuit may also include a first capacitor C1 and a second capacitor C2. For specific connection details, please refer to [reference needed]. Figure 2 I will not go into details.

[0199] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0200] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0201] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0202] In the embodiments provided by this invention, it should be understood that the disclosed apparatus / control devices and methods can be implemented in other ways. For example, the apparatus / control device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0203] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0204] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0205] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the control method embodiments of the various bidirectional charging and discharging circuits described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately added to or subtracted from the content as required by the legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium may not include electrical carrier signals and telecommunication signals.

[0206] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A control method for a bidirectional charging and discharging circuit, characterized in that, The bidirectional charging and discharging circuit includes a first power conversion module, a filter module, and a second power conversion module connected in sequence. When the bidirectional charging and discharging circuit is in charging mode, the second power conversion module is the master switch module, and the first power conversion module is the slave switch module. When the bidirectional charging and discharging circuit is in discharging mode, the first power conversion module is the master switch module, and the second power conversion module is the slave switch module. The control method for the bidirectional charging and discharging circuit includes: The main switch module is controlled to start slowly; wherein, when the main switch module starts slowly, the slave switch module does not work. After the main switch module is controlled to start slowly, it is determined whether to control the slave switch module to start working based on the working mode of the bidirectional charging and discharging circuit and the current load. When it is determined that the slave switch module starts to work, the indentation time of the drive signal of the slave switch module compared with the drive signal of the master switch module is determined according to the working mode of the bidirectional charging and discharging circuit. The slave switch module is controlled to start slowly based on the duration of the indentation of the drive signal of the slave switch module compared to the drive signal of the master switch module.

2. The control method for the bidirectional charging and discharging circuit according to claim 1, characterized in that, The step of determining the indentation duration of the drive signal of the slave switch module relative to the drive signal of the master switch module based on the operating mode of the bidirectional charging and discharging circuit includes: If the bidirectional charging and discharging circuit operates in charging mode, then the indentation time of the drive signal of the slave switch module compared to the drive signal of the master switch module is determined based on the current power of the bidirectional charging and discharging circuit. If the bidirectional charging and discharging circuit operates in discharge mode, then the duration of the indentation of the drive signal of the slave switch module compared to the drive signal of the master switch module is determined to be a first preset duration.

3. The control method for the bidirectional charging and discharging circuit according to claim 2, characterized in that, Determining the indentation duration of the drive signal from the slave switch module relative to the drive signal from the master switch module based on the current power of the bidirectional charging and discharging circuit includes: Based on the correspondence between power and retraction duration, the retraction duration corresponding to the current power of the bidirectional charging and discharging circuit is determined, and used as the retraction duration of the drive signal of the slave switch module compared to the drive signal of the master switch module.

4. The control method for the bidirectional charging and discharging circuit according to claim 3, characterized in that, The process of determining the correspondence between power and inward contraction duration includes: Acquire test data; the test data includes multiple preset power values ​​of the bidirectional charging and discharging circuit and the retraction time values ​​that are respectively matched with the multiple preset power values ​​when the working mode of the bidirectional charging and discharging circuit is the charging mode. The experimental data were fitted to obtain the correspondence between the power and the inward contraction time.

5. The control method for the bidirectional charging and discharging circuit according to claim 1, characterized in that, The step of determining whether to control the switching module to start working based on the operating mode of the bidirectional charging and discharging circuit and the current load includes: If the bidirectional charging and discharging circuit operates in charging mode, then when the current load of the bidirectional charging and discharging circuit is greater than the first preset load, the switch module is controlled to start working. If the bidirectional charging and discharging circuit operates in discharging mode, then when the current load of the bidirectional charging and discharging circuit is greater than the second preset load, the switch module is controlled to start working. Wherein, the first preset load is greater than the second preset load.

6. The control method for the bidirectional charging and discharging circuit according to claim 1, characterized in that, The step of controlling the slow start of the slave switch module based on the indentation time of the drive signal of the slave switch module compared to the drive signal of the master switch module includes: The duty cycle of the switching module is gradually adjusted from zero to a preset duty cycle using a slow start-up method; the preset duty cycle... ,in, The duty cycle of the main switch module. The duration of the indentation of the drive signal from the slave switch module compared to the drive signal from the master switch module. The duration of one work cycle.

7. The control method for the bidirectional charging and discharging circuit according to claim 1, characterized in that, After the control of the soft start from the switch module, the control method for the bidirectional charging and discharging circuit further includes: Based on the operating mode of the bidirectional charging and discharging circuit and the current load, determine whether to control the slave switch module to stop working.

8. The control method for the bidirectional charging and discharging circuit according to claim 7, characterized in that, The step of determining whether to control the slave switch module to stop working based on the operating mode of the bidirectional charging and discharging circuit and the current load includes: If the bidirectional charging and discharging circuit operates in charging mode, then when the current load of the bidirectional charging and discharging circuit is less than the third preset load, the switch module is controlled to stop working. If the bidirectional charging and discharging circuit operates in discharging mode, then when the current load of the bidirectional charging and discharging circuit is less than the fourth preset load, the switch module is controlled to stop working. The third preset load is greater than the fourth preset load.

9. The control method for the bidirectional charging and discharging circuit according to any one of claims 1 to 8, characterized in that, The control of the main switch module to start slowly includes: The operating frequency of the main switch module is gradually adjusted from a first preset frequency to a second preset frequency using a frequency-gradual start method. Wherein, the first preset frequency is greater than the second preset frequency.

10. A control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the control method of the bidirectional charging and discharging circuit according to any one of claims 1 to 9.

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