WO2024045370A1

WO2024045370A1 - Compatible power supply circuit and control method therefor, and controller and storage medium

Info

Publication number: WO2024045370A1
Application number: PCT/CN2022/134384
Authority: WO
Inventors: 钟雄斌; 江海昊; 翟伟刚; 刘勇村; 黄步海
Original assignee: 广东美的制冷设备有限公司
Priority date: 2022-08-31
Filing date: 2022-11-25
Publication date: 2024-03-07

Abstract

Provided in the present disclosure are a compatible power supply circuit and a control method therefor, and a controller and a storage medium. The compatible power supply circuit (100) comprises: an auxiliary power supply (110), which comprises a first input port and a second input port, wherein a first capacitor (101) is provided between the first input port and the second input port, and the second input port is grounded; a photovoltaic power supply unit (120), wherein a first photovoltaic output port thereof is connected to the first input port by means of a unidirectional conduction unit (140), and a second photovoltaic output port thereof being grounded; the unidirectional conduction unit (140), wherein the conduction direction thereof is consistent with the flow direction of a current output by the photovoltaic power supply unit (120); and a power grid power supply unit (130), which is used for converting an alternating current on a power grid side into a direct current, wherein a first power grid output port of the power grid power supply unit (130) is connected to the first input port, and a second power grid output port thereof is grounded.

Description

Compatible with power supply circuits and their control methods, controllers and storage media

Cross-references to related applications

This application requires that the application number 202211052446. 202222326278.0, titled "Compatible Power Supply Circuit", the entire content of which is incorporated into this application by reference.

Technical field

The present disclosure relates to the field of electronic technology, and in particular, to a compatible power supply circuit and its control method, controller and storage medium.

Background technique

The auxiliary power supply of the photovoltaic inverter plays a crucial role in providing power for MCU, drive circuit and other loads. In related technologies, when consumers are not equipped with energy storage batteries, the auxiliary power supply of household photovoltaic inverter products generally only draws power from the DC bus side, or only draws power from the AC side of the power grid. When the auxiliary power supply only draws power from the DC bus side, when the light intensity is weak, the auxiliary power supply will not be able to draw power normally; when the auxiliary power supply only draws power from the AC side of the power grid, when encountering the power grid In the event of a power outage, the auxiliary power supply will not be able to draw power normally. That is, when the power extraction point fails, it will have a great impact on the power extraction work of the auxiliary power supply, which will in turn affect the photovoltaic inverter and prevent it from starting to work normally, affecting the user experience.

Contents of the invention

The present disclosure aims to solve one of the technical problems in the related art, at least to a certain extent.

To this end, the present disclosure proposes a compatible power supply circuit and its control method, controller and storage medium, which can be compatible with the photovoltaic DC side and the AC side of the power grid to supply power to the auxiliary power supply, effectively improve the reliability of the power supply to the auxiliary power supply, and improve the user's safety. Use experience.

In a first aspect, an embodiment of the present disclosure provides a compatible power supply circuit, including: an auxiliary power supply, including a first input port and a second input port, and a third input port is provided between the first input port and the second input port. A capacitor, the second input port is grounded; a photovoltaic power supply unit, the first photovoltaic output port of the photovoltaic power supply unit is connected to the first input port through a one-way conduction unit, and the second photovoltaic output of the photovoltaic power supply unit The port is grounded, and the conduction direction of the one-way conduction unit is consistent with the flow direction of the current output by the photovoltaic power supply unit; the grid power supply unit is used to convert alternating current on the grid side into direct current, and the first grid of the grid power supply unit The output port is connected to the first input port, and the second grid output port of the grid power supply unit is grounded.

The compatible power supply circuit provided according to the embodiment of the first aspect of the present disclosure has at least the following beneficial effects: the auxiliary power supply includes a first input port and a second input port, and a first capacitor is disposed between the first input port and the second input port. , the second input port is grounded; the first photovoltaic output port of the photovoltaic power supply unit is connected to the first input port through the one-way conduction unit, the second photovoltaic output port of the photovoltaic power supply unit is grounded, and the conduction direction of the one-way conduction unit is connected with the photovoltaic power supply The flow direction of the current output by the units is consistent. The photovoltaic power supply unit outputs the photovoltaic power supply current through the first photovoltaic output port, and the first photovoltaic output port has the first potential; the grid power supply unit converts the alternating current on the grid side into direct current, and the first photovoltaic power supply unit of the grid power supply unit The grid output port is connected to the first input port, the second grid output port of the grid power supply unit is grounded, the direct current is output from the first grid output port, and the first grid output port has a second potential; when the first potential is higher than the second potential In this case, the one-way conduction unit is in a conductive state, and the photovoltaic power supply current output by the photovoltaic power supply unit charges the first capacitor after passing through the one-way conduction unit, and provides electric energy to the auxiliary power supply after passing through the smooth filtering effect of the first capacitor; When the second potential is higher than the first potential, the one-way conduction unit is in a cut-off state, and the grid power supply unit outputs direct current through the first grid output port. The direct current is provided between the first input port and the second input port of the auxiliary power supply. The first capacitor is charged and provides electric energy to the auxiliary power supply through the smooth filtering effect of the first capacitor. When one of the grid power supply unit and the photovoltaic power supply unit fails, the other power supply unit can still work normally to supply power to the auxiliary power supply, effectively ensuring the normal operation of the auxiliary power supply. That is to say, through the embodiment of the present disclosure, , can be compatible with the DC side of photovoltaic and the AC side of the power grid to supply auxiliary power, effectively improving the reliability of power supply for auxiliary power and improving the user experience.

According to some embodiments of the present disclosure, a second capacitor is connected between the first photovoltaic output port and the second photovoltaic output port.

According to some embodiments of the present disclosure, the one-way conduction unit includes a positive electrode and a negative electrode, the negative electrode is connected to the first input port, the positive electrode is connected to the first photovoltaic output port, and the current flows from The positive electrode flows to the negative electrode.

According to some embodiments of the present disclosure, a second thermistor whose resistance increases as temperature increases is connected between the first power grid output port and the positive electrode of the one-way conduction unit.

According to some embodiments of the present disclosure, a current limiting resistor connected in series with the second thermistor is further connected between the first power grid output port and the positive electrode of the one-way conduction unit.

According to some embodiments of the present disclosure, a first thermistor whose resistance decreases as temperature increases is connected between the first power grid output port and the negative electrode of the one-way conduction unit.

According to some embodiments of the present disclosure, the grid power supply unit includes a first filter module, a second filter module and a rectifier module, and the second filter input port of the second filter module is connected to the first filter module of the first filter module. The output port is connected, and the second filter output port of the second filter module is connected to the rectifier input port of the rectifier module.

According to some embodiments of the present disclosure, the grid power supply unit further includes a switch unit disposed between the first filtered output port and the second filtered input port.

According to some embodiments of the present disclosure, the photovoltaic power supply unit includes a boost unit and a DC bus, the boost output port of the boost unit is connected to the DC bus, the DC bus includes the first photovoltaic output port and the second photovoltaic output port.

According to some embodiments of the present disclosure, the compatible power supply circuit further includes: a battery power supply unit, the battery power supply unit includes a first battery output port and a second battery output port, the first battery output port is connected to the first battery output port. The photovoltaic output port is connected, and the second battery output port is connected to ground.

In a second aspect, embodiments of the present disclosure provide a control method for a compatible power supply circuit. The compatible power supply circuit includes an auxiliary power supply, including a first input port and a second input port. The first input port and the second input port A first capacitor is arranged between the input ports, and the second input port is grounded; a photovoltaic power supply unit, the first photovoltaic output port of the photovoltaic power supply unit is connected to the first input port through a one-way conduction unit, and the photovoltaic power supply unit The second photovoltaic output port of the power supply unit is grounded, and the conduction direction of the one-way conduction unit is consistent with the flow direction of the current output by the photovoltaic power supply unit; the grid power supply unit is used to convert alternating current on the grid side into direct current. The first grid output port of the grid power supply unit is connected to the first input port, and the second grid output port of the grid power supply unit is grounded;

The control methods include:

The target power supply unit is determined according to the first power supply voltage output by the photovoltaic power supply unit and the second power supply voltage output by the grid power supply unit.

The control method of a compatible power supply circuit according to the embodiment of the present disclosure has at least the following beneficial effects. According to the embodiment of the present disclosure, the first photovoltaic output port of the photovoltaic power supply unit is connected to the first input port of the auxiliary power supply through the one-way conduction unit, the second photovoltaic output port of the photovoltaic power supply unit is grounded, and the conduction direction of the one-way conduction unit is consistent with The flow direction of the current output by the photovoltaic power supply unit is consistent. The photovoltaic power supply unit outputs the photovoltaic power supply current through the first photovoltaic output port, that is, the first photovoltaic output port outputs the first power supply voltage; the grid power supply unit converts the alternating current on the grid side into direct current, and the grid supplies power. The first power grid output port of the unit is connected to the first input port, the direct current is output from the first power grid output port, and the first power grid output port outputs the second power supply voltage; when the first power supply voltage and the second power supply voltage are not equal, it can make The one-way conduction unit is in the conduction state or the cut-off state. When the one-way conduction unit is in the conduction state, the photovoltaic power supply unit is determined to be the target power supply unit; when the one-way conduction unit is in the cut-off state, the grid power supply unit is determined to be the target power supply unit. , the target power supply unit is used to power the auxiliary power supply. Through the embodiments of the present disclosure, the compatible power supply circuit can be compatible with the photovoltaic DC side and the AC side of the power grid to supply power to the auxiliary power supply, effectively improving the reliability of power supply to the auxiliary power supply and improving the user experience.

According to some embodiments of the present disclosure, determining the target power supply unit based on the first power supply voltage output by the photovoltaic power supply unit and the second power supply voltage output by the grid power supply unit includes:

When the first power supply voltage is higher than the second power supply voltage, determine that the grid power supply unit is the target power supply unit;

or,

When the first power supply voltage is lower than the second power supply voltage, the photovoltaic power supply unit is determined to be the target power supply unit.

According to some embodiments of the present disclosure, the photovoltaic power supply unit includes a boost unit and a DC bus, the boost output port of the boost unit is connected to the DC bus, the DC bus includes the first photovoltaic output port and the second photovoltaic output port;

Determining the target power supply unit based on the first power supply voltage output by the photovoltaic power supply unit and the second power supply voltage output by the grid power supply unit further includes:

When the first supply voltage is lower than the second supply voltage, the voltage boosting unit is controlled to perform a voltage boosting process so that the first supply voltage is higher than the second supply voltage, so that the one-way conductor The pass unit is turned on, and the photovoltaic power supply unit is determined to be the target power supply unit.

According to some embodiments of the present disclosure, the compatible power supply circuit further includes: a battery power supply unit having a first battery output port and a second battery output port, the first battery output port being connected to the first photovoltaic output port, The second battery output port is grounded;

When both the first supply voltage and the second supply voltage are zero, the battery power supply unit is determined to be the target power supply unit.

According to some embodiments of the present disclosure, the grid power supply unit further includes a switch unit disposed between the first filtered output port and the second filtered input port;

The control method also includes:

Control the switch unit to turn off so that the second supply voltage is zero;

The insulation resistance of the photovoltaic power supply unit is detected to obtain the insulation resistance value.

According to some embodiments of the present disclosure, after detecting the insulation resistance of the photovoltaic power supply unit to obtain the insulation resistance, the method further includes:

The switch unit is controlled to be closed so that the grid power supply unit outputs the second power supply voltage.

In a third aspect, an embodiment of the present disclosure provides a controller, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the following is implemented: The control method of the compatible power supply circuit described in the second aspect.

The controller of the embodiment of the present disclosure has at least the following beneficial effects. According to the embodiment of the present disclosure, the first photovoltaic output port of the photovoltaic power supply unit is connected to the first input port of the auxiliary power supply through the one-way conduction unit, the second photovoltaic output port of the photovoltaic power supply unit is grounded, and the conduction direction of the one-way conduction unit is consistent with The flow direction of the current output by the photovoltaic power supply unit is consistent. The photovoltaic power supply unit outputs the photovoltaic power supply current through the first photovoltaic output port, that is, the first photovoltaic output port outputs the first power supply voltage; the grid power supply unit converts the alternating current on the grid side into direct current, and the grid supplies power. The first power grid output port of the unit is connected to the first input port, the direct current is output from the first power grid output port, and the first power grid output port outputs the second power supply voltage; when the first power supply voltage and the second power supply voltage are not equal, it can make The one-way conduction unit is in the conduction state or the cut-off state. When the one-way conduction unit is in the conduction state, the photovoltaic power supply unit is determined to be the target power supply unit; when the one-way conduction unit is in the cut-off state, the grid power supply unit is determined to be the target power supply unit. , the target power supply unit is used to power the auxiliary power supply. Through the embodiments of the present disclosure, the compatible power supply circuit can be compatible with the photovoltaic DC side and the AC side of the power grid to supply power to the auxiliary power supply, effectively improving the reliability of power supply to the auxiliary power supply and improving the user experience.

In a fourth aspect, embodiments of the present disclosure provide a computer-readable storage medium that stores computer-executable instructions, and the computer-executable instructions are used to cause a computer to execute the method described in the second aspect. Compatible with power supply circuit control methods.

The computer-readable storage medium of the embodiment of the present disclosure has at least the following beneficial effects. According to the embodiment of the present disclosure, the first photovoltaic output port of the photovoltaic power supply unit is connected to the first input port of the auxiliary power supply through the one-way conduction unit, the second photovoltaic output port of the photovoltaic power supply unit is grounded, and the conduction direction of the one-way conduction unit is consistent with The flow direction of the current output by the photovoltaic power supply unit is consistent. The photovoltaic power supply unit outputs the photovoltaic power supply current through the first photovoltaic output port, that is, the first photovoltaic output port outputs the first power supply voltage; the grid power supply unit converts the alternating current on the grid side into direct current, and the grid supplies power. The first power grid output port of the unit is connected to the first input port, the direct current is output from the first power grid output port, and the first power grid output port outputs the second power supply voltage; when the first power supply voltage and the second power supply voltage are not equal, it can make The one-way conduction unit is in the conduction state or the cut-off state. When the one-way conduction unit is in the conduction state, the photovoltaic power supply unit is determined to be the target power supply unit; when the one-way conduction unit is in the cut-off state, the grid power supply unit is determined to be the target power supply unit. , the target power supply unit is used to power the auxiliary power supply. Through the embodiments of the present disclosure, the compatible power supply circuit can be compatible with the photovoltaic DC side and the AC side of the power grid to supply power to the auxiliary power supply, effectively improving the reliability of power supply for the auxiliary power supply and improving the user experience.

Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

Description of drawings

The drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. They are used to explain the technical solution of the present disclosure together with the embodiments of the present disclosure and do not constitute a limitation of the technical solution of the present disclosure.

Figure 1 is a schematic structural diagram of a compatible power supply circuit provided by an embodiment of the present disclosure;

Figure 2 is a circuit schematic diagram of a compatible power supply circuit provided by an embodiment of the present disclosure;

Figure 3 is a circuit schematic diagram of a compatible power supply circuit provided by another embodiment of the present disclosure;

Figure 4 is a schematic flowchart of a control method for a compatible power supply circuit provided by an embodiment of the present disclosure;

Figure 5 is a flow chart of step S410 provided by another embodiment of the present disclosure;

Figure 6 is a schematic flowchart of another embodiment of the present disclosure providing a control method for a compatible power supply circuit;

Figure 7 is a schematic flowchart of another embodiment of the present disclosure providing a control method for a compatible power supply circuit;

Figure 8 is a schematic structural diagram of a controller provided by an embodiment of the present disclosure.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments described here are only used to explain the present disclosure and are not intended to limit the present disclosure.

In the description of the present disclosure, if there is a description of first and second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number or implicit indication of the indicated technical features. The sequence relationship of the indicated technical features.

In the description of the present disclosure, unless otherwise explicitly limited, words such as "set" and "connection" should be understood in a broad sense. Those skilled in the art can reasonably determine the meaning of the above words in this disclosure based on the content of the technical solution.

The auxiliary power supply is the core component of the household photovoltaic inverter, which can provide power for key functional modules such as the MCU, drive circuit, detection circuit and control circuit of the photovoltaic inverter. At present, the auxiliary power supply of most photovoltaic inverters generally draws power from the AC side of the power grid, or from the DC bus side. The power drawing method of the auxiliary power supply is relatively single. There are many problems with the single method of obtaining power. For example, when the auxiliary power supply only draws power from the AC side of the grid, when the power supply on the AC side of the grid fails, such as a power outage, the auxiliary power supply will not work properly; when the auxiliary power supply only draws power from the DC bus side, when the DC side If there is a power failure on the bus side, such as damage to the photovoltaic power generation components or poor outdoor lighting conditions, the auxiliary power supply will not work properly, which will cause the photovoltaic inverter to fail to operate normally. Based on this, the present disclosure proposes a compatible power supply circuit that can enable the other power supply unit to still work normally to supply the auxiliary power supply when one of the grid power supply unit and the photovoltaic power supply unit fails, effectively ensuring the auxiliary power supply. Normal operation means that through the embodiments of the present disclosure, the photovoltaic DC side and the AC side of the power grid can be compatible with the auxiliary power supply, effectively improving the reliability of the auxiliary power supply and improving the user experience.

The embodiments of the present disclosure will be described below with reference to the accompanying drawings.

Referring to Figures 1 to 2, an embodiment of the present disclosure provides a compatible power supply circuit 100, including: an auxiliary power supply 110, including a first input port and a second input port, with a The first capacitor 101, the second input port is grounded; the photovoltaic power supply unit 120, the first photovoltaic output port of the photovoltaic power supply unit 120 is connected to the first input port through the one-way conduction unit 140, and the second photovoltaic output port of the photovoltaic power supply unit 120 is grounded. , the conduction direction of the one-way conduction unit 140 is consistent with the flow direction of the current output by the photovoltaic power supply unit 120; the grid power supply unit 130 is used to convert the alternating current on the grid side into direct current, and the first grid output port of the grid power supply unit 130 is connected to the first grid power supply unit 130. One input port is connected, and the second grid output port of the grid power supply unit 130 is grounded.

According to the compatible power supply circuit 100 provided by the embodiment of the present disclosure, the auxiliary power supply 110 includes a first input port and a second input port, a first capacitor 101 is disposed between the first input port and the second input port, and the second input port is grounded; The first photovoltaic output port of the photovoltaic power supply unit 120 is connected to the first input port through the one-way conduction unit 140. The second photovoltaic output port of the photovoltaic power supply unit 120 is grounded. The conduction direction of the one-way conduction unit 140 is connected to the direction of the photovoltaic power supply unit 120. The flow direction of the output current is consistent. The photovoltaic power supply unit 120 outputs the photovoltaic power supply current through the first photovoltaic output port, and the first photovoltaic output port has the first potential; the grid power supply unit 130 converts the alternating current on the grid side into direct current. A grid output port is connected to the first input port, a second grid output port of the grid power supply unit 130 is grounded, DC power is output from the first grid output port, and the first grid output port has a second potential; when the first potential is higher than the second Under the condition of potential, the one-way conduction unit 140 is in a conductive state, and the photovoltaic power supply current output by the photovoltaic power supply unit 120 charges the first capacitor 101 after passing through the one-way conduction unit 140. After passing through the smooth filtering effect of the first capacitor 101, The auxiliary power supply 110 provides electric energy; when the second potential is higher than the first potential, the one-way conduction unit 140 is in a cut-off state, and the grid power supply unit 130 outputs direct current through the first grid output port, and the direct current is the third power supply provided on the auxiliary power supply 110. The first capacitor 101 between the first input port and the second input port is charged, and after smoothing and filtering by the first capacitor 101, electric energy is provided to the auxiliary power supply 110. When one of the grid power supply unit 130 and the photovoltaic power supply unit 120 fails, the other power supply unit can still work normally to supply power to the auxiliary power supply 110, effectively ensuring the normal operation of the auxiliary power supply 110. That is to say, through The disclosed embodiment can be compatible with the photovoltaic DC side and the AC side of the power grid to supply power to the auxiliary power supply 110, effectively improving the reliability of power supply to the auxiliary power supply 110 and improving the user experience. In some embodiments, the first potential is DC+ and the second potential is P+.

When the user does not equip the photovoltaic inverter with an energy storage battery and before the photovoltaic inverter is working, the grid power supply unit 130 converts the mains power on the AC side of the grid into direct current power. At this time, the second potential is higher than the first potential. , the one-way conduction unit 140 is in a cut-off state, that is, the branch circuit where the one-way conduction unit 140 is located is open. The grid power supply unit 130 charges the first capacitor 101, and after smoothing and filtering by the first capacitor 101, provides electric energy to the auxiliary power supply 110. . The auxiliary power supply 110 provides power for key functional modules such as the MCU, drive circuit, detection circuit, and control circuit of the photovoltaic inverter, so that the photovoltaic inverter operates normally.

In practical applications, photovoltaic power generation is greatly affected by the environment. There may be situations where the photovoltaic power generation components are damaged and cannot generate electricity, or the light intensity is weak due to weather effects and cannot generate power. All of the above situations will cause the photovoltaic power generation unit to fail. can not work normally. When the photovoltaic power supply unit 120 fails and cannot supply power normally, but the grid power supply unit 130 works normally, at this time, the second potential is higher than the first potential, and the one-way conduction unit 140 is in a cut-off state, that is, where the one-way conduction unit 140 is located When the branch circuit is open, the grid power supply unit 130 charges the first capacitor 101, and after smoothing and filtering by the first capacitor 101, it provides electric energy to the auxiliary power supply 110. The auxiliary power supply 110 provides electric energy to the photovoltaic inverter to enable the photovoltaic inverter to operate normally.

In practical applications, there may be power outages during peak periods or damage to transmission lines leading to abnormal power transmission, causing the grid power supply unit 130 to fail to work normally. When the grid power supply unit 130 fails and cannot supply power normally, but the photovoltaic power supply unit 120 works normally, at this time, the first potential is higher than the second potential, and the one-way conduction unit 140 is in a conductive state, that is, the one-way conduction unit 140 The branch is a path. The photovoltaic power supply current output by the photovoltaic power supply unit 120 charges the first capacitor 101 after passing through the unidirectional conduction unit 140. After smoothing and filtering by the first capacitor 101, it provides electric energy to the auxiliary power supply 110. The auxiliary power supply 110 provides electric energy for the photovoltaic inverter, so that the photovoltaic inverter can operate normally and can be connected to the grid and transmit electric energy to the grid.

When both the grid power supply unit 130 and the photovoltaic power supply unit 120 can supply power normally, and the first potential is higher than the second potential, the one-way conduction unit 140 is in a conductive state, and the photovoltaic power supply unit 120 provides electric energy to the auxiliary power supply 110 ; When the second potential is higher than the first potential, the one-way conduction unit 140 is in a cut-off state, and the grid power supply unit 130 provides electrical energy to the auxiliary power supply 110 . In one embodiment, when the first potential is lower than the second potential, the grid power supply unit 130 provides electric energy to the auxiliary power supply 110. As the illumination increases, the photovoltaic power supply current gradually increases, and the first potential gradually increases. When the first potential is higher than the second potential, the one-way conduction unit 140 switches from the off state to the on state, and the compatible power supply circuit 100 automatically switches to the photovoltaic power supply unit 120 to supply power to the auxiliary power supply 110 . The implementation of the compatible power supply circuit 100 provided by the present disclosure is more economical and easy to implement.

Those skilled in the art can understand that the compatible power supply circuit 100 shown in FIG. 1 does not limit the embodiments of the present disclosure, and may include more or less components than shown, or combine certain components, or different components. component layout.

It should be noted that this disclosure is essentially an improvement on the composition and connection relationship of hardware parts, and does not involve an improvement on the software program itself.

As shown in Figure 1, according to some embodiments of the present disclosure, the one-way conduction unit 140 includes a positive electrode and a negative electrode, the negative electrode is connected to the first input port, the anode is connected to the first photovoltaic output port, and the current flows from the positive electrode to the negative electrode in the conductive state. .

The one-way conduction unit 140 has a one-way conduction characteristic, and its negative electrode is connected to the first input port and the first power grid output port. The first power grid output port has a second potential, and the first photovoltaic output port has a first potential. In the first Under the action of the potential and the second potential, the one-way conduction unit 140 can switch between the on state and the off state, so that the power supply mode switches between the photovoltaic power supply unit 120 and the grid power supply unit 130 . It is compatible with the photovoltaic DC side and the AC side of the power grid to supply power to the auxiliary power supply 110, effectively improving the reliability of power supply to the auxiliary power supply 110 and improving the user experience.

In some embodiments, the one-way conducting unit 140 is a diode. It should be noted that the unidirectional conduction unit 140 can also use IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), or MOS tube (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET, metal-oxide semiconductor field effect transistor). Therefore, this disclosure does not place specific limitations on the implementation manner adopted by the one-way communication unit 140 .

According to some embodiments of the present disclosure, the grid power supply unit 130 includes a first filter module 131, a second filter module 132 and a rectifier module 133. The second filter input port of the second filter module 132 is connected to the first filter module of the first filter module 131. The output port is connected, and the second filter output port of the second filter module 132 is connected to the rectifier input port of the rectifier module 133 .

In some embodiments, the first filter module 131 uses an electromagnetic interference (EMI) filter circuit. The EMI filter circuit can filter the interference to the power supply caused by high-frequency pulses from the external power grid. In addition, the EMI filter circuit is mainly composed of X capacitor and Y capacitor. Both X capacitor and Y capacitor are safety capacitors. The X capacitor is connected in parallel between the live wire and the neutral wire. Its size is usually relatively large and is responsible for filtering out differential mode interference; The Y capacitor is a capacitor connected in parallel between the live wire and the ground wire and between the neutral wire and the ground wire. It usually appears in pairs and is responsible for filtering out common mode interference. The EMI filter circuit also includes a common mode inductor. Modular inductors can enhance the filtering effect. The mains power (Power from Grid) is filtered by the EMI filter circuit and then input into the second filter module 132. The second filter module 132 uses an RC filter circuit, which can remove high-frequency interference. The rectifier module 133 adopts a bridge rectifier circuit. The bridge rectifier circuit includes four rectifier diodes, namely: a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4. After the alternating current is rectified by the bridge rectifier circuit, a direct current pulsating voltage is output, so that the first power grid output port has a second potential. The first capacitor 101 can smooth the rectified current and provide relatively stable electric energy for the auxiliary power supply 110 when the first potential of the first photovoltaic output port is lower than the second potential.

Referring to FIGS. 1 and 2 , according to some embodiments of the present disclosure, a first thermistor 102 whose resistance decreases as the temperature increases is connected between the first power grid output port and the negative electrode of the one-way conduction unit 140 .

In some embodiments, the first thermistor 102 is a NTC (Negative Temperature Coefficient) thermistor. In the rectifier and filter circuit, at the moment when the electronic circuit starts to operate, charging of the capacitive load will generate a surge current and damage the power supply. The NTC thermistor can protect the auxiliary power supply 110 by preventing surge current. And after the NTC thermistor completes the work of resisting the surge current, the current continues to act on the NTC thermistor. As the temperature increases, the resistance value of the NTC thermistor will drop to a very small value, and it consumes The power is very small and can be basically ignored, and will not affect the normal operation of the circuit.

Referring to FIG. 3 , according to some embodiments of the present disclosure, the grid power supply unit 130 further includes a switch unit 105 disposed between the first filtered output port and the second filtered input port.

Photovoltaic modules convert light energy into direct current, and photovoltaic inverters invert the direct current output from photovoltaic modules into alternating current, which can be integrated into the power grid or used by power supplies and equipment. The insulation characteristics of photovoltaic systems are a key factor in evaluating safety performance. In the case of insulation failure, it is easy to cause harm to personnel and indirectly reduce the power generation performance of the photovoltaic system. Therefore, the photovoltaic inverter must detect the insulation resistance of the positive and negative poles of the photovoltaic system to the earth, that is, the photovoltaic inverter needs to perform insulation resistance detection. It can be understood that when using the compatible power supply circuit 100 provided by the embodiment of the present disclosure, the impedance of the neutral line and the live line of the AC input power supply to the earth will affect the detection of insulation resistance, making the detection results inaccurate. Therefore, a switch unit 105 is provided between the first filter output port and the second filter input port of the grid power supply unit 130, and the switch unit 105 is normally closed under normal operating conditions. When it is necessary to detect the insulation resistance of the photovoltaic system, the switch unit 105 is disconnected, that is, the neutral wire and the live wire of the AC input power supply on the AC side of the power grid are disconnected to improve the accuracy of the insulation resistance detection.

In some embodiments, the switch unit 105 uses a relay. Those skilled in the art can understand that when the switch unit 105 adopts a relay, it can be a normally closed double-pole single-throw relay or a double-pole double-throw relay, which can be composed of a normally closed double-pole solid-state relay, or can be It is a combination of two normally closed single-pole single-throw relays or single-pole double-throw relays. In addition, the switch unit 105 may also be a digital switch circuit or an analog switch circuit. Therefore, this disclosure does not place specific limitations on the implementation form of the switch unit 105 .

As shown in Figure 2, according to some embodiments of the present disclosure, the photovoltaic power supply unit 120 includes a boost unit 121 and a DC bus 124. The boost output port of the boost unit 121 is connected to the DC bus 124. The DC bus 124 includes the first photovoltaic output port and a second photovoltaic output port. A second capacitor 104 is connected between the first photovoltaic output port and the second photovoltaic output port. When the photovoltaic power supply unit 130 supplies power, the second capacitor 104 can smooth and filter the output current.

It should be noted that the photovoltaic power supply unit 120 also includes a photovoltaic component 123, and the power generation output port of the photovoltaic component 123 is connected to the boost input port of the boost unit 121. The photovoltaic component 123 is used to convert light energy into direct current. After the direct current is output from the power generation output port, it is input into the boost unit 121 through the boost input port of the boost unit 121. The boost unit 121 is used to increase the voltage of the direct current. The voltage rises High DC power is output from the boost output port of the boost unit 121 to the DC bus 124 .

When both the grid power supply unit 130 and the photovoltaic power supply unit 120 can supply power normally, neither the first potential nor the second potential is zero. When the second potential is higher than the first potential, the one-way conduction unit 140 is in a cut-off state. At the beginning, the auxiliary power supply 110 takes power from the grid power supply unit 130, and then the auxiliary power supply 110 provides power for the photovoltaic inverter, so that the photovoltaic The inverter operates normally. Then the boosting unit 121 can also work normally, raising the first potential so that the first potential is higher than the second potential, so that the one-way conduction unit 140 is in a conductive state, and the compatible power supply circuit 100 automatically switches to: the photovoltaic power supply unit 120 supplies power to the auxiliary power supply 110 . In addition, the compatible power supply circuit 100 also includes an inverter unit 122. The boost output port of the boost unit 121 is also connected to the inverter input port of the inverter unit 122. The inverter unit 122 also includes a grid-connected output port. Through the grid-connected output The port delivers power to the grid. In some implementations, the boost unit 121 is a BOOTS module.

As shown in FIG. 2 , according to some embodiments of the present disclosure, a second thermistor 103 whose resistance increases as the temperature increases is connected between the first power grid output port and the positive electrode of the one-way conduction unit 140 . A current limiting resistor 106 connected in series with the second thermistor 103 is also connected between the first power grid output port and the positive electrode of the one-way conduction unit 140 .

The second thermistor 103 and the current limiting resistor 106 can limit the current and protect the second capacitor 104 . In the absence of an energy storage battery and before the photovoltaic inverter is in operation, the mains power is processed by the first filter module 131, the second filter module 132 and the rectifier module 133, and then divided into two currents. One of the currents supplies power to the auxiliary power supply 110 after passing through the first thermistor 102 . After the other current passes through the current limiting effect of the second thermistor 103 and the current limiting resistor 106, it charges the second capacitor 104 on the DC bus 124, reducing the current impact of the filtered and rectified output DC on the second capacitor 104. . In addition, when a short circuit or other fault occurs between the first photovoltaic output port and the second photovoltaic output port of the DC bus 124, the current passing through the second thermistor 103 will also increase, and the resistance of the second thermistor 103 will increase. It increases as the temperature rises. When the resistance of the second thermistor 103 rises to a certain value, the circuit in which it is located is equivalent to an open circuit, which can protect the DC circuit. In some embodiments, the second thermistor 103 is a PTC (Positive Temperature Coefficient, positive temperature coefficient) thermistor.

As shown in Figure 3, according to some embodiments of the present disclosure, the compatible power supply circuit 100 further includes: a battery power supply unit 150. The battery power supply unit 150 includes a first battery output port and a second battery output port. The first battery output port is connected to the third battery output port. One photovoltaic output port is connected, and the second battery output port is connected to ground.

In some embodiments, the battery power supply unit 150 includes an energy storage battery and a power switch module. The battery output end of the energy storage battery is connected to the input end of the power switch module. The output end of the power switch module is connected to the DC bus 124. At this time, the storage battery The battery can be used as a load on the DC bus 124 . When neither the grid power supply unit 130 nor the photovoltaic power supply unit 120 can operate normally and provide power, the energy storage battery can output electric energy to the DC bus 124 through the power switch module, so that the first photovoltaic output port of the DC bus 124 has the first potential. . At this time, the first potential is higher than the second potential, the one-way conduction unit 140 is in a conductive state, and the battery power supply unit 150 supplies power to the auxiliary power supply 110 . It should be noted that the power switch module uses a DC/DC converter.

Referring to Figure 4, Figure 4 is a schematic flowchart of a control method for a compatible power supply circuit provided by an embodiment of the present disclosure. This control method can be applied to, but is not limited to, the compatible power supply circuits in Figures 1, 2 and 3, wherein, the Compatible power supply circuits include but are not limited to auxiliary power supply, photovoltaic power supply unit, grid power supply unit and one-way conduction unit. The auxiliary power supply includes a first input port and a second input port. A first capacitor is disposed between the first input port and the second input port. The second input port is grounded. The first photovoltaic output port of the photovoltaic power supply unit is connected to the first input port through the one-way conduction unit, the second photovoltaic output port of the photovoltaic power supply unit is grounded, and the conduction direction of the one-way conduction unit is consistent with the flow direction of the current output by the photovoltaic power supply unit. . The grid power supply unit is used to convert alternating current on the grid side into direct current. The first grid output port of the grid power supply unit is connected to the first input port, and the second grid output port of the grid power supply unit is grounded. The control method includes but is not limited to step S410.

Step S410: Determine the target power supply unit according to the first power supply voltage output by the photovoltaic power supply unit and the second power supply voltage output by the grid power supply unit.

In this step, the compatible power supply circuit can determine the target power supply unit based on the first power supply voltage output by the photovoltaic power supply unit and the second power supply voltage output by the grid power supply unit. In the case where the compatible power supply circuit includes a grid power supply unit and a photovoltaic power supply unit, the target power supply unit is a grid power supply unit or a photovoltaic power supply unit. Even if one of them fails to provide power, the target power supply unit can be switched to another power supply unit. Provides power to the auxiliary power supply. Effectively improve the reliability of auxiliary power supply and improve user experience.

In addition, according to an embodiment of the present disclosure, step S410: determining the target power supply unit according to the first power supply voltage output by the photovoltaic power supply unit and the second power supply voltage output by the grid power supply unit includes: when the first power supply voltage is higher than the second power supply voltage In the case of , the grid power supply unit is determined to be the target power supply unit; or, in the case where the first power supply voltage is lower than the second power supply voltage, the photovoltaic power supply unit is determined to be the target power supply unit.

When the first supply voltage is higher than the second supply voltage, the one-way conduction unit is in a conducting state, and the photovoltaic power supply unit outputs from the first photovoltaic output port through the one-way conduction unit and charges the first capacitor. After the smoothing filtering effect of the capacitor, it supplies power to the auxiliary power supply. At this time, the target power supply unit is a photovoltaic power supply unit.

In addition, when the first supply voltage is lower than the second supply voltage, the one-way conduction unit is in a cut-off state, and the output of the photovoltaic power supply unit from the first photovoltaic output port cannot pass through the one-way conduction unit, but is output by the grid power supply unit. The direct current charges the first capacitor, and after smoothing and filtering by the first capacitor, supplies power to the auxiliary power supply. At this time, the target power supply unit is the grid power supply unit.

It can be understood that when the mains power outage or mains transmission failure causes the second supply voltage to be lower than the first supply voltage, the photovoltaic power supply unit supplies power to the auxiliary power supply; when the light intensity is not high or the photovoltaic power generation components are damaged When the first supply voltage is lower than the second supply voltage, the grid power supply unit supplies power to the auxiliary power supply. It should be noted that in actual applications, there are many situations that cause the second supply voltage to be lower than the first supply voltage or cause the first supply voltage to be lower than the second supply voltage. They are not listed here. However, this disclosure The compatible power supply circuit of the embodiment is suitable for various application scenarios and has relatively stable power supply capability.

According to the embodiment of the present disclosure, the first photovoltaic output port of the photovoltaic power supply unit is connected to the first input port of the auxiliary power supply through the one-way conduction unit, the second photovoltaic output port of the photovoltaic power supply unit is grounded, and the conduction direction of the one-way conduction unit is consistent with The flow direction of the current output by the photovoltaic power supply unit is consistent. The photovoltaic power supply unit outputs the photovoltaic power supply current through the first photovoltaic output port, that is, the first photovoltaic output port outputs the first power supply voltage; the grid power supply unit converts the alternating current on the grid side into direct current, and the grid supplies power. The first power grid output port of the unit is connected to the first input port, the direct current is output from the first power grid output port, and the first power grid output port outputs the second power supply voltage; when the first power supply voltage and the second power supply voltage are not equal, it can make The one-way conduction unit is in the conduction state or the cut-off state. When the one-way conduction unit is in the conduction state, the photovoltaic power supply unit is determined to be the target power supply unit; when the one-way conduction unit is in the cut-off state, the grid power supply unit is determined to be the target power supply unit. , the target power supply unit is used to power the auxiliary power supply. Through the embodiments of the present disclosure, the compatible power supply circuit can be compatible with the photovoltaic DC side and the AC side of the power grid to supply power to the auxiliary power supply, effectively improving the reliability of power supply to the auxiliary power supply and improving the user experience.

As shown in Figure 5, Figure 5 is a flow chart of step S410 provided by another embodiment of the present disclosure. According to some embodiments of the present disclosure, the photovoltaic power supply unit includes, but is not limited to, a voltage boosting unit and a DC bus. The boost output port of the boost unit is connected to a DC bus. The DC bus includes a first photovoltaic output port and a second photovoltaic output port. Step S410: Determine the target power supply unit based on the first power supply voltage output by the photovoltaic power supply unit and the second power supply voltage output by the grid power supply unit, which also includes but is not limited to step S510.

Step S510: When the first supply voltage is lower than the second supply voltage, control the voltage boosting unit to perform a voltage boosting process to make the first supply voltage higher than the second supply voltage, turn on the one-way conduction unit, and determine the photovoltaic power supply unit. Power supply unit for the target.

In some embodiments, before the photovoltaic power supply unit is started, the first supply voltage is lower than the second supply voltage. At this time, the grid power supply unit serves as the target power supply unit to supply power to the auxiliary power supply so that the auxiliary power supply operates normally. The auxiliary power supply will provide electrical energy to the boost unit in the photovoltaic power supply unit to start the boost unit. Then, the voltage boosting unit is controlled to boost the first supply voltage so that the first supply voltage is higher than the second supply voltage, thereby causing the one-way conduction unit to conduct. At this time, the target power supply unit is switched from the grid power supply unit to the photovoltaic power supply unit, and the photovoltaic power supply unit is determined to be the target power supply unit.

As shown in FIG. 6 , FIG. 6 is a schematic flowchart of a control method for a compatible power supply circuit provided by another embodiment of the present disclosure. According to some embodiments of the present disclosure, the compatible power supply circuit further includes: a battery power supply unit having a first battery output port and a second battery output port, the first battery output port is connected to the first photovoltaic output port, and the second battery output port is grounded . The control method also includes but is not limited to step S610.

Step S610: When the first power supply voltage and the second power supply voltage are both zero, determine the battery power supply unit as the target power supply unit.

When the compatible power supply circuit includes a photovoltaic power supply unit and a grid power supply unit, the user can also configure a battery power supply unit for the compatible power supply circuit. The battery power supply unit has a first battery output port and a second battery output port, the first battery output port is connected to the first photovoltaic output port, and the second battery output port is grounded. Even if the compatible power supply circuit is additionally configured with a battery power supply unit, the compatible power supply circuit can still: determine that the photovoltaic power supply unit supplies power for the auxiliary power supply when the second supply voltage is lower than the first supply voltage; when the first supply voltage is lower than the second supply voltage In the case of power supply voltage, make sure the grid power supply unit supplies the auxiliary power supply. When the first supply voltage and the second supply voltage are both zero, the battery power supply unit is determined to be the target power supply unit, and the energy storage battery in the battery power supply unit is used to supply power to the auxiliary power supply. It should be noted that in actual applications, there are many situations that cause both the first supply voltage and the second supply voltage to be zero, which are not listed here. The photovoltaic power supply unit functions as a backup power supply and improves the power supply stability of the compatible power supply circuit.

As shown in FIG. 7 , FIG. 7 is a schematic flowchart of a control method for a compatible power supply circuit provided by another embodiment of the present disclosure. According to some embodiments of the present disclosure, the grid power supply unit further includes a switch unit disposed between the first filtered output port and the second filtered input port; the control method also includes but is not limited to step S710 and step S720.

Step S710: Control the switch unit to turn off so that the second supply voltage is zero;

Step S720: Detect the insulation resistance of the photovoltaic power supply unit to obtain the insulation resistance value.

In practical applications, insulation characteristics are a key factor in evaluating the safety of photovoltaic power supply units. In the case of insulation failure, it is easy to cause harm to personnel and indirectly reduce power generation performance. Therefore, insulation testing of photovoltaic power supply units is required. When using a compatible power supply circuit, it is necessary to disconnect the neutral line and live wire on the power supply unit side of the grid to reduce the impact of the impedance of the neutral line and live wire to the earth on insulation detection and improve the accuracy of the detected insulation resistance value. In some embodiments, the grid power supply unit is further provided with a switch unit between the first filtered output port and the second filtered input port. The switch unit is a normally closed switch, used to switch on and off the neutral line and live line on the power supply unit side of the grid. When insulation resistance detection is not required, the switch unit is closed to ensure that the compatible power supply circuit can provide multi-channel power supply to the auxiliary power supply; when insulation resistance detection is required, the switch unit is controlled to open, disconnecting the live wire and zero line on the power supply unit side of the grid. line to make the second power supply voltage zero, and then detect the insulation resistance of the photovoltaic power supply unit to obtain the insulation resistance value. Controlling the switch unit is conducive to reducing the impact of the impedance of the neutral line and the live line to the earth on the accuracy of the detection results, and improving the accuracy of the insulation detection results.

It should be noted that the compatible power supply circuit may also include a controller, and the controller sends a switch control signal to the switch unit to control the opening and closing of the switch unit. In some embodiments, a relay is used as the switching unit. When the photovoltaic power supply unit provides normal power supply voltage and the controller can work normally, when insulation detection is required, the controller outputs a low level to the control signal SW_C of the relay, and the coil of the relay disconnects the power supply from the grid after receiving power. For the neutral line and live line on the unit side, the auxiliary power supply can only draw power from the photovoltaic power supply unit or the power supply unit. These two power drawing methods have no impact on the detection of insulation resistance. Then, the relay can be kept in the off state, and the controller directly detects the insulation resistance of the photovoltaic power supply unit. And while the relay remains in the off state, the controller can perform multiple insulation resistance tests as needed.

According to some embodiments of the present disclosure, after detecting the insulation resistance of the photovoltaic power supply unit to obtain the insulation resistance, the method further includes: controlling the switch unit to close so that the grid power supply unit outputs the second supply voltage. In some embodiments, after the insulation resistance detection is completed, the switch unit is controlled to be closed, so that the neutral line and the live line on the power supply unit side of the grid are reconnected, and the multi-channel power supply of the auxiliary power supply by the compatible power supply circuit is restored. For example, a relay is used as the switch unit. After the auxiliary power supply is powered on from the grid power supply unit or the photovoltaic power supply unit, and the controller can work normally, when insulation detection needs to be performed, the controller outputs low power to the relay's control signal SW_C. After receiving power, the coil of the relay disconnects the neutral line and live line on the power supply unit side of the grid. Then, the controller performs insulation resistance detection. After the detection time t, the insulation resistance detection is completed. Then, the controller outputs a high level to the control signal SW_C of the relay, so that the neutral line and the live line on the side of the grid power supply unit are reconnected, and the auxiliary power supply can draw power from the grid power supply unit. The detection time t value range is preset to 1 to 20 seconds. In this way, every time an insulation resistance test is performed, the relay needs to be controlled to open first, and then the relay needs to be closed after completion.

Based on the above control method compatible with the power supply circuit, various embodiments of the controller and the computer-readable storage medium of the present disclosure are respectively proposed below.

As shown in FIG. 8 , FIG. 8 is a schematic structural diagram of a controller provided by an embodiment of the present disclosure. The controller 800 includes: a memory 810, a processor 820, and a computer program stored in the memory 810 and executable on the processor 820. When the computer program is run, it is used to execute the above-mentioned control method compatible with the power supply circuit.

The processor 820 and the memory 810 may be connected through a bus or other means.

As a non-transitory computer-readable storage medium, the memory 810 can be used to store non-transitory software programs and non-transitory computer executable programs, such as the control method of a compatible power supply circuit described in the embodiments of the present disclosure. The processor 820 implements the above control method compatible with the power supply circuit by running the non-transient software programs and instructions stored in the memory 810 . The memory 810 may include a program storage area and a data storage area, where the program storage area may store an operating system and an application program required for at least one function; the storage data area may store a control method for executing the above-mentioned compatible power supply circuit. In addition, memory 810 may include high-speed random access memory and may also include non-transitory memory, such as at least one storage device storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 810 may include memory 810 located remotely relative to the processor 820, and these remote memories 810 may be connected to the controller 800 through a network. Examples of the above-mentioned networks include but are not limited to the Internet, intranets, local area networks, mobile communication networks and combinations thereof.

The non-transitory software programs and instructions required to implement the above-mentioned control method of a compatible power supply circuit are stored in the memory 810. When executed by one or more processors 820, the above-mentioned control method of a compatible power supply circuit is executed, for example, executing Method step S410 in Fig. 4, method step S510 in Fig. 5, step S610 in Fig. 6 and method steps S710 to S720 in Fig. 7.

The non-transient software programs and instructions required to implement the control method of the compatible power supply circuit of the above embodiment are stored in the memory, and when executed by the processor, the control method of the compatible power supply circuit of the above embodiment is executed.

According to the technical solution of the embodiment of the present disclosure, the first photovoltaic output port of the photovoltaic power supply unit is connected to the first input port of the auxiliary power supply through the one-way conduction unit, the second photovoltaic output port of the photovoltaic power supply unit is grounded, and the conduction of the one-way conduction unit The passing direction is consistent with the flow direction of the current output by the photovoltaic power supply unit. The photovoltaic power supply unit outputs the photovoltaic power supply current through the first photovoltaic output port, that is, the first photovoltaic output port outputs the first power supply voltage; the grid power supply unit converts the alternating current on the grid side into direct current. , the first grid output port of the grid power supply unit is connected to the first input port, DC power is output from the first grid output port, and the first grid output port outputs the second power supply voltage; when the first power supply voltage and the second power supply voltage are not equal , can make the one-way conduction unit in the conduction state or the cut-off state. When the one-way conduction unit is in the conduction state, the photovoltaic power supply unit is determined to be the target power supply unit; when the one-way conduction unit is in the cut-off state, the grid power supply unit is determined to be Target power supply unit, the target power supply unit is used to supply power to the auxiliary power supply. Through the embodiments of the present disclosure, the compatible power supply circuit can be compatible with the photovoltaic DC side and the AC side of the power grid to supply power to the auxiliary power supply, effectively improving the reliability of power supply to the auxiliary power supply and improving the user experience.

Since the controller of the embodiment of the present disclosure can execute the control method of the compatible power supply circuit of the above embodiment, the implementation and technical effects of the controller of the embodiment of the present disclosure can be referred to the control method of the compatible power supply circuit of any of the above embodiments. Method implementation and technical effects.

In addition, one embodiment of the present disclosure also provides a computer-readable storage medium that stores computer-executable instructions, and the computer-executable instructions are used to execute the above-mentioned control method of a compatible power supply circuit. Exemplarily, the above-described method steps in Figures 4 to 7 are performed.

Since the computer-readable storage medium of the embodiment of the present disclosure can implement the control method of the compatible power supply circuit of the above-mentioned embodiment, the implementation and technical effects of the computer-readable storage medium of the embodiment of the present disclosure can be referred to any of the above-mentioned embodiments. The implementation and technical effects of the control method of the compatible power supply circuit.

Those of ordinary skill in the art can understand that all or some steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit . Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As is known to those of ordinary skill in the art, the term computer storage media includes volatile and nonvolatile media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. removable, removable and non-removable media. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disk (DVD) or other optical disk storage, magnetic cassettes, tapes, disk storage or other magnetic storage devices, or may Any other medium used to store the desired information and that can be accessed by a computer. Furthermore, it is known to those of ordinary skill in the art that communication media typically includes computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media .

The above is a description of the preferred implementations of the present disclosure, but the present disclosure is not limited to the above-mentioned embodiments. Those skilled in the art can also make various equivalent modifications or substitutions without violating the spirit of the present disclosure. These equivalents All modifications or substitutions are included in the scope of this disclosure.

Claims

A compatible power supply circuit including:

An auxiliary power supply includes a first input port and a second input port, a first capacitor is disposed between the first input port and the second input port, and the second input port is grounded;

Photovoltaic power supply unit, the first photovoltaic output port of the photovoltaic power supply unit is connected to the first input port through a one-way conduction unit, the second photovoltaic output port of the photovoltaic power supply unit is grounded, and the conduction of the one-way conduction unit The direction of flow is consistent with the flow direction of the current output by the photovoltaic power supply unit;

A grid power supply unit is used to convert alternating current on the grid side into direct current. The first grid output port of the grid power supply unit is connected to the first input port, and the second grid output port of the grid power supply unit is grounded.
The compatible power supply circuit according to claim 1, wherein a second capacitor is connected between the first photovoltaic output port and the second photovoltaic output port.
The compatible power supply circuit according to claim 1, wherein the one-way conduction unit includes a positive electrode and a negative electrode, the negative electrode is connected to the first input port, the positive electrode is connected to the first photovoltaic output port, and the conductive In the on state, current flows from the positive electrode to the negative electrode.
The compatible power supply circuit according to claim 3, wherein a second thermal sensor whose resistance increases with the increase of temperature is connected between the first power grid output port and the positive electrode of the one-way conduction unit. resistance.
The compatible power supply circuit according to claim 4, wherein a current limiting resistor connected in series with the second thermistor is further connected between the first power grid output port and the positive electrode of the one-way conduction unit.
The compatible power supply circuit according to claim 3, wherein a first thermistor whose resistance decreases as the temperature increases is connected between the first power grid output port and the negative electrode of the one-way conduction unit. .
The compatible power supply circuit according to claim 1, wherein the grid power supply unit includes a first filter module, a second filter module and a rectifier module, and the second filter input port of the second filter module is connected to the first filter module. The first filter output port of the module is connected, and the second filter output port of the second filter module is connected to the rectifier input port of the rectifier module.
The compatible power supply circuit according to claim 7, wherein the grid power supply unit further includes a switch unit disposed between the first filtered output port and the second filtered input port.
The compatible power supply circuit according to claim 1, wherein the photovoltaic power supply unit includes a boost unit and a DC bus, the boost output port of the boost unit is connected to the DC bus, the DC bus includes the a first photovoltaic output port and the second photovoltaic output port.
The compatible power supply circuit according to any one of claims 1 to 9, wherein the compatible power supply circuit further includes: a battery power supply unit, the battery power supply unit includes a first battery output port and a second battery output port, the The first battery output port is connected to the first photovoltaic output port, and the second battery output port is grounded.
A control method for a compatible power supply circuit, wherein the compatible power supply circuit includes an auxiliary power supply, including a first input port and a second input port, and a first input port is provided between the first input port and the second input port. a capacitor, the second input port is grounded; a photovoltaic power supply unit, the first photovoltaic output port of the photovoltaic power supply unit is connected to the first input port through a one-way conduction unit, and the second photovoltaic output port of the photovoltaic power supply unit Grounding, the conduction direction of the one-way conduction unit is consistent with the flow direction of the current output by the photovoltaic power supply unit; the grid power supply unit is used to convert the alternating current on the grid side into direct current, and the first grid output of the grid power supply unit The port is connected to the first input port, and the second power grid output port of the power grid power supply unit is grounded;

The control methods include:

The target power supply unit is determined according to the first power supply voltage output by the photovoltaic power supply unit and the second power supply voltage output by the grid power supply unit.
The control method of a compatible power supply circuit according to claim 11, wherein determining the target power supply unit according to the first power supply voltage output by the photovoltaic power supply unit and the second power supply voltage output by the grid power supply unit includes:

When the first power supply voltage is higher than the second power supply voltage, determine that the grid power supply unit is the target power supply unit;

or,

When the first power supply voltage is lower than the second power supply voltage, the photovoltaic power supply unit is determined to be the target power supply unit.
The control method compatible with a power supply circuit according to claim 11, wherein the photovoltaic power supply unit includes a boost unit and a DC bus, the boost output port of the boost unit is connected to the DC bus, and the DC bus including the first photovoltaic output port and the second photovoltaic output port;

Determining the target power supply unit based on the first power supply voltage output by the photovoltaic power supply unit and the second power supply voltage output by the grid power supply unit further includes:

When the first supply voltage is lower than the second supply voltage, the voltage boosting unit is controlled to perform a voltage boosting process so that the first supply voltage is higher than the second supply voltage, so that the one-way conductor The pass unit is turned on, and the photovoltaic power supply unit is determined to be the target power supply unit.
The control method of a compatible power supply circuit according to claim 12, wherein the compatible power supply circuit further includes: a battery power supply unit having a first battery output port and a second battery output port, the first battery output port being connected to the The first photovoltaic output port is connected, and the second battery output port is grounded;

When both the first supply voltage and the second supply voltage are zero, the battery power supply unit is determined to be the target power supply unit.
The control method for a compatible power supply circuit according to any one of claims 11 to 14, wherein the grid power supply unit further includes a switch unit disposed between the first filter output port and the second filter input port;

The control method also includes:

Control the switch unit to turn off so that the second supply voltage is zero;

The insulation resistance of the photovoltaic power supply unit is detected to obtain the insulation resistance value.
The control method for a compatible power supply circuit according to claim 15, wherein the step of detecting the insulation resistance of the photovoltaic power supply unit to obtain the insulation resistance further includes:

The switch unit is controlled to be closed so that the grid power supply unit outputs the second power supply voltage.
A controller, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements as described in any one of claims 11 to 16 control method.
A computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to cause the computer to execute the control method according to any one of claims 11 to 16.