Photovoltaic energy storage converter charging and discharging control circuit and photovoltaic equipment

Abstract

The present invention provides a photovoltaic energy storage converter charge and discharge control circuit and photovoltaic equipment, the control circuit includes a photovoltaic transformer module, a photovoltaic drive power module, an energy storage transformer module, an energy storage drive power module, an energy storage module, a bus and a charging branch; the photovoltaic transformer module is connected to the energy storage transformer module through the bus, the photovoltaic drive power module is connected to the photovoltaic transformer module, the energy storage drive power module is connected to the bus, and the energy storage drive power module is connected to the energy storage transformer module; the bus is provided with a normally open switch, the charging branch is provided with a normally closed switch, the charging branch is connected to the photovoltaic transformer module, and the charging branch is connected to the energy storage module. By setting the charging branch, in the case of insufficient light intensity, the photovoltaic panel can directly charge the energy storage module through the charging branch, and in the case of sufficient light intensity, the energy storage module is charged by stepping down the energy storage transformer module, thereby avoiding the problem that the photovoltaic device cannot be started due to insufficient light.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic charge and discharge control, and in particular to a photovoltaic energy storage converter charge and discharge control circuit and a photovoltaic device. Background Art

[0002] The off-grid photovoltaic energy storage inverter is composed of batteries, energy storage DC (Direct Current, direct current) / DC, photovoltaic DC / DC, etc. During the day, DC / DC photovoltaic power generation is used to charge the energy storage and provide power to the DC load. If the photovoltaic power generation is insufficient, the energy storage is insufficiently charged or the power consumption is too much, the energy storage over-discharge protection will be caused, and the photovoltaic DC / DC driver will not be able to obtain electricity from the energy storage to start photovoltaic power generation, causing the entire system to be paralyzed and unable to restart. If the light intensity is sufficient, the photovoltaic DC / DC driver can be provided with starting power by photovoltaics. When the light intensity is insufficient, the photovoltaic DC / DC cannot be started and the system is in a power-off state. Summary of the invention

[0003] Based on this, it is necessary to provide a photovoltaic energy storage inverter charging and discharging control circuit and photovoltaic equipment to address the above technical problems.

[0004] A photovoltaic energy storage converter charge and discharge control circuit, comprising: a photovoltaic transformer module, a photovoltaic drive power module, an energy storage transformer module, an energy storage drive power module, an energy storage module, a bus bar and a charging branch;

[0005] The first end of the photovoltaic transformer module is used to be electrically connected to the photovoltaic panel, the second end of the photovoltaic transformer module is connected to the first end of the energy storage transformer module through the busbar, and the second end of the energy storage transformer module is connected to the energy storage module;

[0006] The first end of the photovoltaic drive power module is used to be electrically connected to the photovoltaic panel, the second end of the photovoltaic drive power module is connected to the third end of the photovoltaic transformer module, the first end of the energy storage drive power module is connected to the busbar, and the second end of the energy storage drive power module is connected to the third end of the energy storage transformer module;

[0007] The busbar is provided with a normally open switch, the charging branch is provided with a normally closed switch, the first end of the charging branch is connected to the second end of the photovoltaic transformer module, and the second end of the charging branch is connected to the energy storage module.

[0008] In one of the embodiments, the normally open switch on the busbar and the normally closed switch on the charging branch are configured to be closed at different times.

[0009] In one embodiment, the energy storage module includes a battery unit and an energy storage control unit, the battery unit is connected to the second end of the energy storage transformer module and the second end of the charging branch, the energy storage control unit is connected to the normally open switch, and the energy storage control unit is used to control the normally open switch to close when the output voltage of the photovoltaic transformer module is greater than or equal to a first preset voltage.

[0010] In one of the embodiments, the energy storage control unit is connected to the normally closed switch, and the energy storage control unit is used to control the normally closed switch to open when the output voltage of the photovoltaic transformer module is greater than or equal to a first preset voltage.

[0011] In one of the embodiments, the busbar is also used to connect a load, and the energy storage control unit is used to control the normally closed switch to open and the normally open switch to close when the energy storage module supplies power to the load.

[0012] In one of the embodiments, the photovoltaic transformer module includes a photovoltaic control unit, which is connected to the normally closed switch, and is used to control the normally closed switch to open when the output voltage of the photovoltaic panel is greater than or equal to a second preset voltage.

[0013] In one embodiment, the energy storage control unit is connected to the normally open switch and the normally closed switch, and the energy storage control unit is used to stop working when the output voltage of the photovoltaic transformer module is less than the first preset voltage, so that the normally open switch remains open and the normally closed switch remains closed.

[0014] In one embodiment, the number of the normally closed switches is two, the energy storage control unit is used to control one of the normally closed switches to be disconnected, and the photovoltaic control unit is used to control the other one of the normally closed switches to be disconnected.

[0015] In one embodiment, the photovoltaic transformation module includes a photovoltaic control unit, which is connected to the normally open switch and the normally closed switch, respectively. The photovoltaic control unit is used to control the normally closed switch to open and the normally open switch to close when the output voltage of the photovoltaic panel is greater than or equal to a second preset voltage.

[0016] A photovoltaic device comprises the photovoltaic energy storage converter charge and discharge control circuit described in any one of the above embodiments.

[0017] The above-mentioned photovoltaic energy storage inverter charge and discharge control circuit and photovoltaic device, by setting a charging branch, enables the photovoltaic panel to directly charge the energy storage module through the charging branch when the light intensity is insufficient, thereby avoiding the accumulation of electricity in the bus capacitor, resulting in the photovoltaic drive power module reaching the starting condition, and the photovoltaic drive power module consumes the bus capacitor electricity after starting and fails to meet the drive power starting condition, thereby avoiding frequent start and stop of the system; and when the light intensity is sufficient, the energy storage module is charged by stepping down the voltage through the energy storage transformer module, thereby avoiding the problem that the photovoltaic device cannot be started due to insufficient light, so that the energy storage module can still be charged under weak light conditions, avoiding the problem of overall paralysis and inability to restart of the photovoltaic device, thereby improving the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the circuit principle of a photovoltaic energy storage converter charge and discharge control circuit in one embodiment;

[0019] Figure 2 It is a circuit principle schematic diagram of a photovoltaic energy storage converter charging and discharging control circuit in another embodiment;

[0020] Figure 3 It is a circuit principle diagram of a photovoltaic energy storage inverter charging and discharging control circuit in yet another embodiment. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0023] Embodiment 1

[0024] In this embodiment, Figure 1As shown, a photovoltaic energy storage inverter charge and discharge control circuit is provided, including: a photovoltaic transformer module, a photovoltaic drive power module, an energy storage transformer module, an energy storage drive power module, an energy storage module, a busbar and a charging branch; the first end of the photovoltaic transformer module is used to be electrically connected to the photovoltaic panel, the second end of the photovoltaic transformer module is connected to the first end of the energy storage transformer module through the busbar, and the second end of the energy storage transformer module is connected to the energy storage module; the first end of the photovoltaic drive power module is used to be electrically connected to the photovoltaic panel, the second end of the photovoltaic drive power module is connected to the third end of the photovoltaic transformer module, the first end of the energy storage drive power module is connected to the busbar, and the second end of the energy storage drive power module is connected to the third end of the energy storage transformer module; the busbar is provided with a normally open switch, the charging branch is provided with a normally closed switch, the first end of the charging branch is connected to the second end of the photovoltaic transformer module, and the second end of the charging branch is connected to the energy storage module.

[0025] In this embodiment, the photovoltaic transformer module is also called photovoltaic DC / DC, which is used to transform the voltage of the photovoltaic panel to input it to the busbar, and the energy storage transformer module is also called energy storage DC / DC, which is used to transform the voltage of the busbar so that the electric energy is input to the energy storage module. The energy storage module is used to store electric energy, and the energy storage module can also provide electric energy. That is, the energy storage module can be charged and discharged, and can provide electric energy to the load when discharging. The photovoltaic drive power supply module is also called photovoltaic DC / DC drive power supply, which is used to draw electricity from the photovoltaic panel to supply power to the photovoltaic transformer module so that the photovoltaic transformer module works, and the energy storage drive power supply module is also called energy storage DC / DC drive power supply, which is used to draw electricity from the busbar to supply power to the energy storage transformer module so that the energy storage transformer module works. The busbar is used to connect the photovoltaic transformer module and the energy storage transformer module, and is used to connect the load so that the energy storage module can supply power to the load when discharging.

[0026] In this embodiment, a bus capacitor is provided on the bus, the normally open switch on the bus is used to control the conduction and disconnection of the bus, and the normally closed switch on the charging branch is used to control the conduction and disconnection of the charging branch. The normally open switch is closed when controlled and remains open when not controlled, and the normally closed switch is open when controlled and remains closed when not controlled.

[0027] It should be understood that in traditional photovoltaic equipment, since no charging branch is set, when the light intensity is insufficient, the bus capacitor will gradually accumulate electricity. When the accumulated electricity of the capacitor reaches a certain level, the photovoltaic drive power module reaches the starting condition, and after the photovoltaic drive power module starts, it consumes the bus capacitor electricity and fails to reach the drive power start condition, which will cause the system to start and stop frequently. In this embodiment, by setting a charging branch, when the light intensity is insufficient, the photovoltaic panel can directly charge the energy storage module through the charging branch, avoiding the accumulation of electricity in the bus capacitor, causing the photovoltaic drive power module to reach the starting condition, and after the photovoltaic drive power module starts, it consumes the bus capacitor electricity and fails to reach the drive power start condition, avoiding the frequent start and stop of the system; and when the light intensity is sufficient, the energy storage transformer module is used to step down the voltage to charge the energy storage module, thereby avoiding the problem that the photovoltaic device cannot be started due to insufficient light, so that the energy storage module can still be charged in the case of weak light, avoiding the problem of overall paralysis and inability to restart the photovoltaic device, thereby improving the stability of the device.

[0028] In one embodiment, the normally open switch on the busbar and the normally closed switch on the charging branch are configured not to be closed at the same time.

[0029] In this embodiment, the normally open switch on the bus and the normally closed switch on the charging branch are configured to be in different states at the same time. The normally open switch and the normally closed switch are not closed at the same time, that is, when the normally open switch is open, the normally closed switch is closed; when the normally open switch is closed, the normally closed switch is open. In this way, when the light intensity is sufficient, the photovoltaic panel can generate enough electrical energy, and the photovoltaic drive power module and the energy storage drive power module obtain sufficient starting voltage. The photovoltaic drive power module supplies power to the photovoltaic transformer module to make the photovoltaic transformer module work to step down the voltage of the photovoltaic panel to output it to the bus. The energy storage drive power module supplies power to the energy storage transformer module to make the energy storage transformer module work. At this time, the normally closed switch on the charging branch is disconnected under control, and no current passes through the charging branch, so the energy storage module cannot be charged. The normally open switch is closed under control, and the electric energy of the bus is transmitted to Energy storage transformer module, the energy storage transformer module steps down the voltage of the busbar and transmits it to the energy storage module to charge the energy storage module; when the light intensity is weak, the voltage generated by the photovoltaic panel is small, and the photovoltaic drive power module and the energy storage drive power module cannot start due to insufficient starting voltage. At this time, the normally open switch remains disconnected without control, and the busbar cannot transmit electrical energy to the energy storage module through the energy storage transformer module, while the normally closed switch on the charging branch remains closed without control, so that the low voltage generated by the photovoltaic panel charges the energy storage module through the charging branch.

[0030] In one embodiment, the energy storage module includes a battery unit and an energy storage control unit, the battery unit is connected to the second end of the energy storage transformer module and the second end of the charging branch, the energy storage control unit is connected to the normally open switch, and the energy storage control unit is used to control the normally open switch to close when the output voltage of the photovoltaic transformer module is greater than or equal to a first preset voltage.

[0031] In this embodiment, the battery unit is used for charging and discharging, and the energy storage control unit is used to control the closing of the normally open switch. The energy storage control unit is also called the energy storage control board. When the light intensity is sufficient, the photovoltaic panel generates sufficient voltage, and the energy storage drive power module obtains sufficient starting voltage and starts, so that the energy storage controls the energy storage transformer module to work. At this time, because the photovoltaic panel generates sufficient voltage, the voltage output to the bus by the photovoltaic drive power module is greater than or equal to the first preset voltage. At this time, the normally open switch is closed under the control of the energy storage control unit, so that the electric energy of the bus is output to the energy storage transformer module, and the battery unit is charged after the energy storage transformer module steps down the voltage. When the light intensity is weak, the photovoltaic panel cannot generate sufficient voltage, and the energy storage drive power module cannot be started. At this time, the normally open switch on the bus remains disconnected, so that the bus is disconnected, and the bus cannot transmit electric energy to the energy storage module through the energy storage transformer module, while the normally closed switch on the charging branch remains closed without control, so that the low voltage generated by the photovoltaic panel charges the energy storage module through the charging branch.

[0032] In one embodiment, the energy storage control unit is connected to the normally closed switch, and the energy storage control unit is used to control the normally closed switch to open when the output voltage of the photovoltaic transformer module is greater than or equal to a first preset voltage.

[0033] In this embodiment, when the light intensity is sufficient, the photovoltaic panel generates sufficient voltage, so that the voltage output by the photovoltaic drive power module to the bus is greater than or equal to the first preset voltage, and the energy storage drive power module obtains a sufficient starting voltage and starts, thereby controlling the energy storage control energy storage transformer module to work. At this time, the energy storage control unit controls the normally closed switch on the charging branch to disconnect, so that the charging branch is disconnected, and the electric energy cannot charge the battery unit through the charging branch. Since the voltage of the photovoltaic panel is too high at this time, it is easy to damage the battery. Therefore, disconnecting the charging branch can prevent the electric energy of the photovoltaic panel from directly charging the battery unit. At this time, the electric energy is charged by the battery unit after being stepped down by the energy storage control energy storage transformer module from the bus.

[0034] In one embodiment, the busbar is also used to connect a load, and the energy storage control unit is used to control the normally closed switch to open and the normally open switch to close when the energy storage module supplies power to the load.

[0035] In this embodiment, when the battery unit is discharging, the energy storage control unit controls the normally open switch on the bus to close, and controls the normally closed switch on the charging branch to open, so that the bus is turned on and the charging branch is disconnected, so that the battery unit can supply power to the load through the bus.

[0036] In one embodiment, the photovoltaic transformer module includes a photovoltaic control unit, which is connected to the normally closed switch. The photovoltaic control unit is used to control the normally closed switch to open when the output voltage of the photovoltaic panel is greater than or equal to a second preset voltage.

[0037] In this embodiment, the photovoltaic control unit is also called a photovoltaic control panel. When the light intensity is large, the output voltage of the photovoltaic panel is large and is greater than or equal to a second preset voltage. At this time, the photovoltaic control unit controls the normally closed switch to disconnect, so that the charging branch is disconnected, and the electric energy of the photovoltaic panel is charged by the photovoltaic transformer module and the energy storage transformer module through the voltage reduction.

[0038] In one embodiment, the energy storage control unit is connected to the normally open switch and the normally closed switch, and the energy storage control unit is used to stop working when the output voltage of the photovoltaic transformer module is less than the first preset voltage, so that the normally open switch remains open and the normally closed switch remains closed.

[0039] In this embodiment, when the light intensity is weak, the output voltage of the bus is small and is less than the first preset voltage, the energy storage drive power supply module cannot be started, the energy storage transformer module stops working, and the energy storage transformer module cannot reduce the voltage. Therefore, the normally open switch remains disconnected without control, so that the bus is disconnected, and the normally closed switch remains closed without control, so that the charging branch is closed. In this way, the voltage of the photovoltaic panel will directly charge the energy storage module through the charging branch. Since the light intensity is weak at this time, the voltage of the photovoltaic panel is small, and therefore, the battery cells of the energy storage module can be directly charged without causing damage to the battery cells.

[0040] In one embodiment, Figure 2 As shown, the number of the normally closed switches is two, the energy storage control unit is used to control one of the normally closed switches to be disconnected, and the photovoltaic control unit is used to control the other one of the normally closed switches to be disconnected.

[0041] In this embodiment, the normally closed switch includes a normally closed switch S2 and a normally closed switch S3, the energy storage control unit is connected to the normally closed switch S3, the energy storage control unit is used to control the disconnection of the normally closed switch S3, the photovoltaic control unit is connected to the normally closed switch S2, and the photovoltaic control unit is used to control the disconnection of the normally closed switch S2. Specifically, when the light intensity is relatively large, the output voltage of the photovoltaic panel is greater than or equal to the second preset voltage, and the output voltage of the photovoltaic transformer module is greater than or equal to the first preset voltage. At this time, the energy storage control unit controls the normally closed switch S3 to be disconnected, and the photovoltaic control unit controls the normally closed switch S2 to be disconnected. In this way, the charging branch can be disconnected. Even if one of the energy storage control unit and the photovoltaic control unit fails, the charging branch can still be disconnected to avoid a large voltage from directly charging the battery unit through the charging branch, thereby effectively improving reliability.

[0042] In one embodiment, the photovoltaic transformation module includes a photovoltaic control unit, which is respectively connected to the normally open switch and the normally closed switch, and is used to control the normally closed switch to open and the normally open switch to close when the output voltage of the photovoltaic panel is greater than or equal to a second preset voltage.

[0043] In this embodiment, when the light intensity is relatively high, the normally open switch on the bus and the normally closed switch on the charging branch are both connected to the photovoltaic control unit, and the closing of the normally open switch on the bus and the opening of the normally closed switch on the charging branch are both controlled by the photovoltaic control unit. In this way, when the light intensity is relatively high and the photovoltaic panel generates a relatively large output voltage, the photovoltaic control unit controls the normally closed switch to open and controls the normally open switch to close, so that the output voltage of the photovoltaic panel is stepped down by the photovoltaic transformer module and the energy storage transformer module to charge the battery unit, thereby avoiding a relatively large voltage directly charging the battery unit through the charging branch, thereby effectively improving reliability.

[0044] In one embodiment, the minimum starting voltage of the energy storage drive power module is equal to the minimum starting voltage of the photovoltaic drive power module. In this way, the energy storage drive power module and the photovoltaic drive power module can obtain the starting conditions at the same time, start at the same time, or not start at the same time, so that either the normally open switch is closed, the bus is turned on, the normally closed switch is disconnected, and the charging branch is disconnected, or the normally open switch is disconnected, the bus is disconnected, the normally closed switch is closed, and the charging branch is turned on, so that either the bus charges the battery unit through the energy storage transformer module, or the battery unit is charged by the charging branch, and there is no situation where the bus and the charging branch charge the battery unit at the same time.

[0045] In one embodiment, the minimum starting voltage of the energy storage driving power module is greater than the minimum starting voltage of the photovoltaic driving power module, and the minimum starting voltage of the energy storage driving power module and the minimum starting voltage of the photovoltaic driving power module are less than the maximum voltage of direct charging of the battery unit.

[0046] In this embodiment, since the minimum starting voltage of the energy driving power module is greater than the minimum starting voltage of the photovoltaic driving power module, and the minimum starting voltage of the energy storage driving power module and the minimum starting voltage of the photovoltaic driving power module are less than the maximum voltage of the direct charging of the battery unit, when the photovoltaic driving power module is started, the bus is turned on and the charging branch is disconnected, and when the voltage is not sufficient to start the photovoltaic driving power module, the charging branch is turned on and the bus is disconnected, and there is no situation where the bus and the charging branch charge the battery unit at the same time.

[0047] Embodiment 2

[0048] In this embodiment, Figure 2 As shown, the circuit schematic diagram of the off-grid photovoltaic energy storage inverter charging and discharging control circuit, Figure 2 The switches S1, S2, and S3 are all controllable switches, of which S2 and S3 are normally closed switches, and S1 is a normally open switch. Figure 2 Medium energy storage refers to energy storage module. Energy storage includes battery, BMS (BATTERY MANAGEMENT SYSTEM) and energy storage control board. Photovoltaic DC / DC includes photovoltaic control board and sampling circuit board. Photovoltaic DC / DC drive power source draws power from photovoltaic to power photovoltaic control board and sampling circuit board of photovoltaic DC / DC. Energy storage DC / DC drive power source draws power from bus. When photovoltaic DC / DC is not working, bus voltage is equal to photovoltaic voltage. Switch S2 is controlled by photovoltaic control board, and switches S1 and S3 are controlled by energy storage control board. S2 or S3 cannot be closed at the same time as S1.

[0049] Method 1: When the energy storage is discharged, the energy storage control board disconnects switch S3 and closes switch S1, and the load draws power from the bus. When the energy storage is charged, the first situation: when the light intensity is sufficient, the photovoltaic drive power supply is sufficient to start, the photovoltaic DC control board and the detection circuit work, and the switch S2 is disconnected. The photovoltaic panel cannot directly charge the battery. The voltage is too high and it is easy to damage the battery. The photovoltaic optimization is run at the maximum power point. The energy storage DC / DC drive power supply draws power from the bus, closes switch S1, disconnects switch S3, and then performs a voltage reduction operation to reduce the high voltage of the bus to a low voltage to charge the battery. The energy storage control board will communicate with the photovoltaic control board. After the energy storage is fully charged, if there is no load to use electricity, switch S1 is disconnected, and S2 and S3 remain disconnected. When there is a load, keep S1 closed and S2 and S3 remain disconnected. The second situation: When the photovoltaic intensity is weak, the photovoltaic DC / DC drive power supply and the energy storage DC / DC drive power supply cannot be started, so the switch S1 will remain disconnected, S2 and S3 will remain normally closed, and the low-voltage electricity generated by the photovoltaic panel will be directly charged to the battery through the charging branch. In this embodiment, the starting voltage of the photovoltaic DC / DC drive power supply board is equal to that of the energy storage DC / DC drive power supply board, or the minimum starting voltage of the energy storage DC / DC drive power supply board should be greater than the minimum starting voltage of the photovoltaic DC / DC drive power supply board, and the minimum starting voltage of the photovoltaic DC / DC drive power supply board and the energy storage DC / DC drive power supply board is less than the maximum voltage of the battery direct charge.

[0050] Embodiment 3

[0051] like Figure 3 As shown, in this embodiment, the normally open switch S1 and the normally closed switch S2 are both controlled by the photovoltaic control panel. When supplying power to the energy storage, S2 is opened and S1 is closed.

[0052] In the above embodiment, when the light intensity is insufficient, the bus capacitor is prevented from gradually accumulating electricity, which causes the photovoltaic DC / DC drive power supply to start. After the startup consumes the power of the bus capacitor, the drive power supply startup conditions are not met, causing the system to start and stop frequently. In addition, when the light intensity is insufficient, the photovoltaic DC / DC does not work, and the electricity generated by the photovoltaic panel can be directly charged to the battery to avoid waste.

[0053] Embodiment 4

[0054] In one embodiment, a photovoltaic device is provided, comprising the photovoltaic energy storage converter charge and discharge control circuit described in any one of the above embodiments.

[0055] In the above embodiment, by setting a charging branch, when the light intensity is insufficient, the photovoltaic panel can directly charge the energy storage module through the charging branch, and when the light intensity is sufficient, the energy storage module is charged by stepping down the voltage through the energy storage transformer module, thereby avoiding the problem that the photovoltaic device cannot be started due to insufficient light, and the energy storage module can still be charged under weak light conditions, avoiding the problem of the entire photovoltaic device being paralyzed and unable to restart, thereby improving the stability of the device.

[0056] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A photovoltaic energy storage converter charge and discharge control circuit, It is characterized in that include: Photovoltaic transformer module, photovoltaic drive power module, energy storage transformer module, energy storage drive power module, energy storage module, busbar and charging branch; The first end of the photovoltaic transformer module is used to be electrically connected to the photovoltaic panel, the second end of the photovoltaic transformer module is connected to the first end of the energy storage transformer module through the busbar, and the second end of the energy storage transformer module is connected to the energy storage module; The first end of the photovoltaic drive power module is used to be electrically connected to the photovoltaic panel, the second end of the photovoltaic drive power module is connected to the third end of the photovoltaic transformer module, the first end of the energy storage drive power module is connected to the busbar, and the second end of the energy storage drive power module is connected to the third end of the energy storage transformer module; The busbar is provided with a normally open switch, the charging branch is provided with a normally closed switch, the first end of the charging branch is connected to the second end of the photovoltaic transformer module, and the second end of the charging branch is connected to the energy storage module; The normally open switch on the busbar and the normally closed switch on the charging branch are configured not to be closed at the same time, The energy storage module includes a battery unit and an energy storage control unit, wherein the battery unit is connected to the second end of the energy storage transformer module and the second end of the charging branch, and the energy storage control unit is connected to the normally open switch, and the energy storage control unit is used to control the normally open switch to close when the output voltage of the photovoltaic transformer module is greater than or equal to the first preset voltage, so that the electric energy of the busbar is output to the energy storage transformer module, and the energy storage module is charged after the voltage is reduced by the energy storage transformer module; The energy storage control unit is connected to the normally open switch and the normally closed switch. The energy storage control unit is used to stop working when the output voltage of the photovoltaic transformer module is less than the first preset voltage, so that the normally open switch remains open and the normally closed switch remains closed, so that the voltage generated by the photovoltaic panel charges the energy storage module through the charging branch.

2. The photovoltaic energy storage converter charge and discharge control circuit according to claim 1, It is characterized in that The energy storage control unit is connected to the normally closed switch, and the energy storage control unit is used to control the normally closed switch to open when the output voltage of the photovoltaic transformer module is greater than or equal to a first preset voltage.

3. The photovoltaic energy storage converter charge and discharge control circuit according to claim 1, It is characterized in that The busbar is also used to connect a load, and the energy storage control unit is used to control the normally closed switch to open and the normally open switch to close when the energy storage module supplies power to the load.

4. The photovoltaic energy storage converter charge and discharge control circuit according to claim 1, It is characterized in that The photovoltaic transformer module includes a photovoltaic control unit, which is connected to the normally closed switch. The photovoltaic control unit is used to control the normally closed switch to open when the output voltage of the photovoltaic panel is greater than or equal to a second preset voltage.

5. The photovoltaic energy storage converter charge and discharge control circuit according to claim 4, It is characterized in that The number of the normally closed switches is two, the energy storage control unit is used to control one of the normally closed switches to be disconnected, and the photovoltaic control unit is used to control the other one of the normally closed switches to be disconnected.

6. The photovoltaic energy storage converter charge and discharge control circuit according to claim 1, It is characterized in that The photovoltaic transformation module includes a photovoltaic control unit, which is connected to the normally open switch and the normally closed switch respectively. The photovoltaic control unit is used to control the normally closed switch to open and the normally open switch to close when the output voltage of the photovoltaic panel is greater than or equal to a second preset voltage.

7. A photovoltaic device, It is characterized in that It comprises the photovoltaic energy storage converter charging and discharging control circuit described in any one of claims 1 to 6.

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