Photovoltaic system, electronic and electrical equipment and vehicle

Abstract

The invention discloses a photovoltaic system, electronic and electrical equipment and a vehicle. The photovoltaic system comprises a photovoltaic cell assembly, at least one turn-off module and a voltage conversion module. The photovoltaic cell assembly comprises a plurality of photovoltaic cells which are connected in series; the turn-off module is connected between two adjacent photovoltaic cells in the photovoltaic cell assembly; the first end of the voltage conversion module is connected with each turn-off module, and the voltage conversion module is used for controlling the turn-off modules to be turned on and turned off based on power supply signals of the turn-off modules. The photovoltaic system can send the power supply signal through the voltage conversion module to control the on-off of the turn-off module, an additional control module is not needed, the structure is simple, the number of devices is small, space and cost are saved, and the turn-off module is fast in switching and higher in efficiency.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a photovoltaic system, as well as an electrical and electronic device and a vehicle. Background Art

[0002] In the related art, a photovoltaic system needs to support a component-level fast shutdown function to avoid high DC voltages in situations such as firefighting and maintenance, eliminating potential safety hazards. In the current photovoltaic system, a control module is provided in the shutdown module, and the series connection and disconnection of photovoltaic cells in the photovoltaic system are controlled by this control module. Multiple control modules are required, the system structure is complex, there are many components, the cost is high, and the working efficiency is low. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, an object of the present invention is to provide a photovoltaic system, which can control the on-off of the shutdown module by sending a power supply signal through a voltage conversion module, without an additional control module, with a simple structure, fewer components, saving space and cost, and the shutdown module has a rapid switch and higher efficiency.

[0004] A second object of the present invention is to provide an electrical and electronic device.

[0005] A third object of the present invention is to provide a vehicle.

[0006] To solve the above problems, an embodiment of the first aspect of the present invention provides a photovoltaic system, including: a photovoltaic cell assembly, the photovoltaic cell assembly including a plurality of the photovoltaic cells connected in series; at least one shutdown module, the shutdown module being connected between two adjacent photovoltaic cells in the photovoltaic cell assembly; a voltage conversion module, a first end of the voltage conversion module being connected to each shutdown module, the voltage conversion module being configured to control the on-off of the shutdown module based on a power supply signal to the shutdown module.

[0007] In the photovoltaic system according to the embodiment of the present invention, when a plurality of photovoltaic cells connected in series in the photovoltaic cell assembly can all work normally, the voltage conversion module quickly controls the shutdown module to close by sending a power supply signal. When a fault occurs or maintenance is required in a plurality of photovoltaic cells connected in series in the photovoltaic cell assembly, the voltage conversion module stops sending the power supply signal, and the shutdown module disconnects, eliminating potential safety hazards. The voltage conversion module sends a power supply signal to control the on-off of the shutdown module, without an additional control module, with a simple structure, fewer components, saving space and cost, and the shutdown module has a rapid switch and higher efficiency.

[0008] In some embodiments, the second end of the voltage conversion module is connected to the output end of the photovoltaic cell assembly. A shutdown module is also provided between the second end of the voltage conversion module and the output end of the photovoltaic cell assembly. The shutdown module is connected to the first end of the voltage conversion module to be turned on and off based on the power supply signal.

[0009] In some embodiments, the third end of the voltage conversion module is adapted to be connected to the energy storage battery. The voltage conversion module is further configured to convert the electrical energy signal output by the photovoltaic cell assembly into the electrical energy signal required for charging the energy storage battery when the shutdown module is in the conducting state.

[0010] In some embodiments, when the photovoltaic system and / or the device where the photovoltaic system is located meet the charging conditions, the first end of the voltage conversion module outputs a power supply signal to each shutdown module to make each shutdown module conduct. Or, when the photovoltaic system and / or the device where the photovoltaic system is located do not meet the charging conditions, the first end of the voltage conversion module does not output a power supply signal, so that each shutdown module is in the off state.

[0011] In some embodiments, the shutdown module includes: a switch unit. The first end of the switch unit is connected to the first end of the corresponding target photovoltaic cell. The second end of the switch unit is connected to the second end of the adjacent photovoltaic cell of the target photovoltaic cell or the second end of the voltage conversion module. The control end of the switch unit is connected to the first end of the voltage conversion module. The switch unit is configured to control the connection state between the target photovoltaic cell and the adjacent photovoltaic cell or the voltage conversion module.

[0012] In some embodiments, the switch unit includes: a first switch tube. The first end of the first switch tube is connected to the first end of the corresponding photovoltaic cell. The second end of the first switch tube is connected to the second end of the adjacent photovoltaic cell or the second end of the voltage conversion module. The control end of the first switch tube is configured to control the first switch tube to conduct when a conduction voltage signal is input, where the conduction voltage signal is obtained based on the power supply signal sent by the voltage conversion module. A second switch tube. The first end of the second switch tube is connected to the first end of the first switch tube. The second end of the second switch tube is connected to the second end of the first switch tube. The control end of the second switch tube is configured to control the second switch tube to conduct when the conduction voltage signal is input.

[0013] In some embodiments, the switching unit further includes: a first pull-down resistor, a first end of the first pull-down resistor is connected to a control end of the first switching transistor, and a second end of the first pull-down resistor is connected to a second end of the first switching transistor and a second end of the second switching transistor; a second pull-down resistor, a first end of the second pull-down resistor is connected to a control end of the second switching transistor, and a second end of the second pull-down resistor is connected to a second end of the second switching transistor and a second end of the first switching transistor.

[0014] In some embodiments, the switching unit further includes: a first voltage stabilizing diode, a first end of the first voltage stabilizing diode is connected to a control end of the first switching transistor, and a second end of the first voltage stabilizing diode is connected to a second end of the first switching transistor and a second end of the second switching transistor; a second voltage stabilizing diode, a first end of the second voltage stabilizing diode is connected to a control end of the second switching transistor, and a second end of the second voltage stabilizing diode is connected to a second end of the second switching transistor and a second end of the first switching transistor.

[0015] In some embodiments, the shutdown module further includes: a bypass unit, a first end of the bypass unit is connected to a second end of the switching unit, and a second end of the bypass unit is connected to a second end of the target photovoltaic cell or a second end of the voltage conversion module, and the bypass unit is configured to conduct when a switching unit in the shutdown module fails.

[0016] In some embodiments, the bypass unit includes: a first bypass diode, a first end of the first bypass diode is connected to a second end of the target photovoltaic cell, and a second end of the first bypass diode is connected to a second end of the first switching transistor and a second end of the second switching transistor, and the first bypass diode conducts when the switching unit fails.

[0017] In some embodiments, the bypass unit further includes: an absorption circuit, a first end of the absorption circuit is connected to a first end of the first bypass diode and a second end of the target photovoltaic cell, and a second end of the absorption circuit is connected to a second end of the first bypass diode, and the absorption circuit is configured to absorb voltage.

[0018] In some embodiments, the absorption circuit includes: a first capacitor, a first end of the first capacitor is connected to a second end of the first bypass diode; a first resistor, a first end of the first resistor is connected to a second end of the first capacitor; a first bead, a first end of the first bead is connected to a second end of the first resistor, and a second end of the first bead is connected to a first end of the first bypass diode and a second end of the target photovoltaic cell.

[0019] In some embodiments, the shutdown module further includes: a conversion unit, a first end of the conversion unit is connected to a first end of the voltage conversion module, a second end of the conversion unit is connected to a control end of the first switching tube and a control end of the second switching tube, and the conversion unit is configured to convert the power supply signal sent by the voltage conversion module into a conduction voltage of the first switching tube and the second switching tube.

[0020] In some embodiments, the conversion unit includes: a driver, an input end of the driver is connected to the first end of the voltage conversion module to input the power supply signal, and the driver is configured to convert the power supply signal into an alternating current signal; a transformer, a primary coil of the transformer is connected to an output end of the driver, the transformer includes a first secondary coil and a second secondary coil, a second end of the first secondary coil and a first end of the second secondary coil are connected to a common end, the common end is connected to a second end of the first switching tube, a second end of the second switching tube, and a first end of the bypass unit, and the transformer is configured to transmit the alternating current signal; a rectification circuit, an input end of the rectification circuit is connected to a first end of the first secondary coil and a second end of the second secondary coil, and an output end of the rectification circuit is connected to the control end of the first switching tube and the control end of the second switching tube, and the rectification circuit is configured to convert the alternating current signal into the conduction voltage.

[0021] In some embodiments, the rectification circuit includes: a first diode and a second diode, a first end of the first diode is connected to the first end of the first secondary coil, a first end of the second diode is connected to the second end of the second secondary coil, a second end of the first diode and a second end of the second diode are connected to a node, and the node is connected to the control end of the first switching tube and the control end of the second switching tube.

[0022] In some embodiments, the shutdown module is integrated in a junction box of the target photovoltaic cell.

[0023] In some embodiments, the shutdown module further includes at least one second bypass diode, and the at least one second bypass diode is connected in parallel with the target photovoltaic cell.

[0024] In some embodiments, the photovoltaic system further includes: a light detection module, an output end of the light detection module is connected to the voltage conversion module, and is configured to output a wake-up signal to the voltage conversion module when the light reaches a light threshold value to wake up the voltage conversion module.

[0025] In some embodiments, the light detection module includes a first detection end and a second detection end. The first detection end is connected to the first end of the last photovoltaic cell of the photovoltaic cell assembly, and the second detection end is connected to the second end of the last photovoltaic cell. The light detection module is configured to determine that the light reaches the light threshold when the output voltage of the last photovoltaic cell reaches a voltage threshold; wherein, the last photovoltaic cell is the photovoltaic cell at the end of the photovoltaic cell assembly that is not connected to the second end of the voltage conversion module.

[0026] In some embodiments, the photovoltaic system and / or the device where the photovoltaic system is located not meeting the charging conditions includes at least one of a failure of the energy storage battery connected to the voltage conversion module, a failure of the voltage conversion module itself, and a failure of the device where the photovoltaic system is located.

[0027] In some embodiments, the photovoltaic system further includes: a relay switch, which is disposed on the connection line between the second end of the voltage conversion module and the output end of the photovoltaic cell assembly. The power supply end of the relay switch is connected to the voltage conversion module, and the relay switch is configured to conduct when the photovoltaic system and / or the device where the photovoltaic system is located meets the charging conditions.

[0028] An embodiment of the second aspect of the present invention provides an electronic and electrical device, and the electronic and electrical device includes the photovoltaic system described in the above embodiments.

[0029] According to the electronic and electrical device of the embodiment of the present invention, the photovoltaic system includes a photovoltaic cell assembly. When multiple serially connected photovoltaic cells in the photovoltaic cell assembly can all work normally, the voltage conversion module sends a power supply signal to quickly control the closing of the shutdown module. When a failure occurs or maintenance is required in multiple serially connected photovoltaic cells in the photovoltaic cell assembly, the voltage conversion module stops sending the power supply signal, and the shutdown module disconnects, eliminating potential safety hazards. The voltage conversion module sends a power supply signal to control the on / off of the shutdown module, without an additional control module, with a simple structure, fewer components, saving space and cost, and the shutdown module has a rapid switch and higher efficiency.

[0030] In some embodiments, the electronic and electrical device includes a vehicle, and the voltage conversion module of the photovoltaic system is the on-vehicle charger of the vehicle.

[0031] In some embodiments, the electronic and electrical device further includes a vehicle controller, and the vehicle controller is connected to the on-vehicle charger to send vehicle fault information.

[0032] In some embodiments, the electronic and electrical device includes an inverter circuit module, and the voltage conversion module of the photovoltaic system is the inverter circuit module.

[0033] In a third aspect embodiment of the present invention, a vehicle is provided, and the vehicle includes the photovoltaic system described in the above embodiments.

[0034] For the vehicle according to the embodiments of the present invention, the photovoltaic system includes a photovoltaic cell assembly. When multiple series-connected photovoltaic cells in the photovoltaic cell assembly can all work normally, the voltage conversion module sends a power supply signal to quickly control the closing of the cut-off module. When a fault occurs or maintenance is required in multiple series-connected photovoltaic cells in the photovoltaic cell assembly, the voltage conversion module stops sending the power supply signal, and the cut-off module disconnects, eliminating potential safety hazards. The voltage conversion module sends a power supply signal to control the on / off of the cut-off module, without the need for an additional control module, with a simple structure, fewer components, saving space and cost, and the cut-off module has a rapid switch and higher efficiency.

[0035] In some embodiments, the vehicle further includes an on-vehicle charger, and the on-vehicle charger serves as the voltage conversion module in the photovoltaic system.

[0036] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where: Figure 1 is a schematic diagram of a photovoltaic system according to an embodiment of the present invention; Figure 2 is a schematic diagram of a cut-off module circuit according to an embodiment of the present invention; Figure 3 is a structural block diagram of an electronic and electrical device according to an embodiment of the present invention; Figure 4 is a structural block diagram of an electrical device according to an embodiment of the present invention; Figure 5 is a structural block diagram of an electrical device according to an embodiment of the present invention; Figure 6 is a structural block diagram of a vehicle according to an embodiment of the present invention; Figure 7 is a structural block diagram of a vehicle according to an embodiment of the present invention.

[0038] Reference Signs: Electronic and Electrical Device 200; Vehicle 300; Photovoltaic System 100; Vehicle Controller 201; On-vehicle Charger 202; Inverter Circuit Module 210; Photovoltaic cell module 110; shutdown module 120; voltage conversion module 130; switch unit 121; first switch tube Q1; second switch tube Q2; first pull-down resistor R1; second pull-down resistor R2; first voltage regulator diode D3; second voltage regulator diode D5; bypass unit 122; first bypass diode D6; absorption circuit 123; first capacitor C3; first resistor R3; first bead B3; conversion unit 124; driver U1; transformer T; first secondary coil T1; second secondary coil T2; rectification circuit 125; first diode D1; second diode D2; second bypass diodes (D4, D7, D8); light detection module 140; relay switch 150. Detailed implementation manners

[0039] Embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention will be described in detail below.

[0040] In the prior art, both electric vehicles and photovoltaic power generation have witnessed rapid development. More and more automobile manufacturers have also launched new energy vehicles with photovoltaic power generation. Currently, the industry technologies for solar power generation in new energy vehicles mainly include the following two methods: solar panels are connected in parallel to supply power to the low-voltage air conditioning system and the battery, increasing comfort. The other is to supply power to the power battery after conversion to increase the cruising range, but the efficiency will be relatively low; solar panels are connected in series, and high voltage is supplied to the power battery after control conversion to increase the cruising range. This method has higher efficiency, but due to the existence of high voltage, it is required that the photovoltaic power generation system needs to support the component-level fast shutdown function to avoid high DC voltage in situations such as fire fighting and maintenance, eliminating potential safety hazards. The existing in-vehicle photovoltaic system uses a low-voltage system and does not have a fast shutdown function. The fast shutdown system of photovoltaic power stations is complex, with many components and high costs, and is not suitable for the high-voltage shutdown of in-vehicle photovoltaics.

[0041] To solve the above problems, an embodiment of the first aspect of the present invention provides a photovoltaic system. This photovoltaic system can control the on / off of the shutdown module by sending a power supply signal through the voltage conversion module, without an additional control module, with a simple structure, fewer components, saving space and cost, and the shutdown module has a rapid switch and higher efficiency.

[0042] As Figure 1 shown, the photovoltaic system 100 includes: a photovoltaic cell module 110, at least one shutdown module 120, and a voltage conversion module 130.

[0043] Among them, the photovoltaic cell module 110 includes a plurality of photovoltaic cells connected in series. In some embodiments, the photovoltaic cells are in the form of battery panels, for example Figure 1The PV in it can be called a photovoltaic panel; each shutdown module 120 is connected between two adjacent photovoltaic cells in the photovoltaic cell module. For example, a shutdown module 120 is arranged between every two adjacent connected photovoltaic cells among multiple serially connected photovoltaic cells. The shutdown module 120 can control the on / off states of the two adjacent photovoltaic cells it is connected to; the first end of the voltage conversion module 130 is connected to each shutdown module 120, and the voltage conversion module 130 is used to control the on / off of the shutdown module 120 based on the power supply signal to the shutdown module 120.

[0044] Specifically, the photovoltaic cell module 110 is a circuit unit formed by connecting multiple photovoltaic cells in series, and it is the core component of the photovoltaic system 100. Through the series design, the photovoltaic cell module 110 can superimpose the weak voltages of individual photovoltaic cells to increase the voltage and form an output voltage that meets the actual application requirements; when a photovoltaic cell in the photovoltaic cell module 110 fails or when maintenance needs to be performed on the photovoltaic system 100, the voltage conversion module 130 controls the shutdown module 120 to quickly disconnect through the power supply signal, so that the photovoltaic cell module 110 stops outputting voltage outward, ensuring the safety of the photovoltaic system 100.

[0045] For the photovoltaic system according to the embodiment of the present invention, when multiple serially connected photovoltaic cells in the photovoltaic cell module can all work normally, the voltage conversion module sends a power supply signal to quickly control the shutdown module to close. When a failure occurs or maintenance is needed among multiple serially connected photovoltaic cells in the photovoltaic cell module, the voltage conversion module stops sending the power supply signal, and the shutdown module disconnects, eliminating potential safety hazards. The voltage conversion module sends a power supply signal to control the on / off of the shutdown module, without the need for an additional control module, with a simple structure, fewer components, saving space and cost, and the shutdown module has a rapid switch and higher efficiency.

[0046] In some embodiments, as Figure 1 shown, the second end of the voltage conversion module 130 is connected to the output end of the photovoltaic cell module 110, and a shutdown module 120 is also arranged between the second end of the voltage conversion module 130 and the output end of the photovoltaic cell module 110. The shutdown module 120 is connected to the first end of the voltage conversion module 130 to be turned on and off based on the power supply signal.

[0047] Specifically, the second end of the voltage conversion module 130 is connected to the output end of the photovoltaic cell module 110. The output end of the photovoltaic cell module 110 outputs voltage outward, and the second end of the voltage conversion module 130 converts the output voltage of the photovoltaic cell module 110 and supplies power to other devices. A shutdown module 120 is also provided between the second end of the voltage conversion module 130 and the output end of the photovoltaic cell module 110. The shutdown module 120 is connected to the first end of the voltage conversion module 130 to turn on and off according to the power supply signal. The photovoltaic system 100 determines whether the photovoltaic cell module 110 meets the power supply condition. If it meets the power supply condition, the first end of the voltage conversion module 130 outputs a power supply signal to the shutdown module 120 to make it conductive, so that multiple photovoltaic cell modules are connected into the photovoltaic cell module 110 to form high-voltage power supply. When the power supply condition is not met, the first end of the voltage conversion module 130 stops outputting the power supply signal, and the shutdown module 120 will disconnect due to power outage, and the photovoltaic cell module 110 stops supplying high-voltage power outward.

[0048] In some embodiments, as Figure 1 shown, the third end of the voltage conversion module 130 is adapted to be connected to a storage battery, and the voltage conversion module 130 is further configured to convert the electrical energy signal output by the photovoltaic cell module 110 into an electrical energy signal required for charging the storage battery in the conductive state of the shutdown module 120.

[0049] Specifically, the second end of the voltage conversion module 130 is connected to the output end of the photovoltaic cell module 110, and the third end of the voltage conversion module 130 is adapted to be connected to a storage battery. The photovoltaic system 100 determines whether the photovoltaic cell module 110 meets the power supply condition. When the power supply condition is met, the first end of the voltage conversion module 130 outputs a power supply signal to the shutdown module 120 to make it conductive. Multiple photovoltaic cell modules are connected in series as the photovoltaic cell module 110. The output end of the photovoltaic cell module 110 supplies high-voltage power to the second end of the voltage conversion module 130. The voltage conversion module 130 converts the electrical energy signal output by the photovoltaic cell module 110 into an electrical energy signal required for charging the storage battery, and charges the storage battery through the third end of the voltage conversion module 130.

[0050] In some embodiments, when the photovoltaic system 100 and / or the device where the photovoltaic system 100 is located meets the charging condition, the first end of the voltage conversion module 130 outputs a power supply signal to each shutdown module 120 to make each shutdown module 120 conductive. Or, when the photovoltaic system 100 and / or the device where the photovoltaic system 100 is located does not meet the charging condition, the first end of the voltage conversion module 130 has no power supply signal output, so that each shutdown module 120 is in a disconnected state.

[0051] Specifically, the shutdown module 120 is connected to the first end of the voltage conversion module 130 to be turned on and off according to the power supply signal; the photovoltaic system 100 determines whether the photovoltaic cell module 110 meets the power supply condition. If it meets the power supply condition, that is, when the photovoltaic system 100 or the device where the photovoltaic system 100 is located meets the charging condition, or both the photovoltaic system 100 and the device where the photovoltaic system 100 is located meet the charging condition, the first end of the voltage conversion module 130 will output a power supply signal to the shutdown module 120 to make it conductive, so that multiple photovoltaic cells are connected into the photovoltaic cell module 110 to form a high-voltage power supply; when the power supply condition is not met, that is, when the photovoltaic system 100 or the device where the photovoltaic system 100 is located does not meet the charging condition, or both the photovoltaic system 100 and the device where the photovoltaic system 100 is located do not meet the charging condition, the first end of the voltage conversion module 130 stops outputting the power supply signal, and the shutdown module 120 will disconnect due to power outage, and the photovoltaic cell module 110 stops supplying high voltage outward.

[0052] For example, the control of the shutdown module 120 of the present invention multiplexes the voltage conversion module 130, without an additional control module. The implementation of the shutdown module 120 is simple, without a transmitting and receiving device, with fewer components, saving space and cost.

[0053] In some embodiments, as Figure 1 shown, the shutdown module 120 includes: a switch unit 121.

[0054] Specifically, the first end of the switch unit 121 is connected to the first end of the corresponding target photovoltaic cell, the second end of the switch unit 121 is connected to the second end of the adjacent photovoltaic cell of the target photovoltaic cell or the second end of the voltage conversion module 130, and the control end of the switch unit 121 is connected to the first end of the voltage conversion module 130. The switch unit 121 is used to control the connection state between the target photovoltaic cell and the adjacent photovoltaic cell or the voltage conversion module 130.

[0055] The target photovoltaic cell can be understood as the photovoltaic cell whose on and off are controlled by the switch unit 121. The control end of the switch unit 121 is connected to the first end of the voltage conversion module 130 to be turned on and off according to the power supply signal. When the switch unit 121 is conductive, the target cell connected by the switch unit 121 is connected to the photovoltaic cell module 110 for power supply. When the switch unit 121 is disconnected, the target cell connected by the switch unit 121 is no longer connected to the photovoltaic cell module 110 and no longer supplies power outward.

[0056] In some embodiments, as Figure 2 shown, the switch unit 121 includes: a first switch tube Q1 and a second switch tube Q2.

[0057] Specifically, the first end of the first switching transistor Q1 is connected to the first end of the corresponding photovoltaic cell, the second end of the first switching transistor Q1 is connected to the second end of the adjacent photovoltaic cell or the second end of the voltage conversion module 130, and the control end of the first switching transistor Q1 is used to control the first switching transistor Q1 to conduct when an input conduction voltage signal is received, where the conduction voltage signal is obtained based on the power supply signal sent by the voltage conversion module 130; the first end of the second switching transistor Q2 is connected to the first end of the first switching transistor Q1, the second end of the second switching transistor Q2 is connected to the second end of the first switching transistor Q1, and the control end of the second switching transistor Q2 is used to control the second switching transistor Q2 to conduct when an input conduction voltage signal is received.

[0058] The switching unit 121 includes a first switching transistor Q1 and a second switching transistor Q2. The control end of the switching unit 121 is connected to the first end of the voltage conversion module 130. The photovoltaic system 100 determines whether the photovoltaic cell module 110 meets the power supply condition. If the power supply condition is met, the first end of the voltage conversion module 130 outputs a power supply signal to the switching unit 121. At this time, the first switching transistor Q1 and the second switching transistor Q2 conduct; when the power supply condition is not met, the first end of the voltage conversion module 130 stops outputting the power supply signal to the switching unit 121. At this time, the first switching transistor Q1 and the second switching transistor Q2 turn off.

[0059] In some embodiments, as Figure 2 shown, the switching unit 121 further includes: a first pull-down resistor R1 and a second pull-down resistor R2.

[0060] Wherein, the first end of the first pull-down resistor R1 is connected to the control end of the first switching transistor Q1, and the second end of the first pull-down resistor R1 is connected to the second end of the first switching transistor Q1 and the second end of the second switching transistor Q2; the first end of the second pull-down resistor R2 is connected to the control end of the second switching transistor Q2, and the second end of the second pull-down resistor R2 is connected to the second end of the second switching transistor Q2 and the second end of the first switching transistor Q1.

[0061] Specifically, the first pull-down resistor R1 and the second pull-down resistor R2 consume electrical energy when the first end of the voltage conversion module 130 stops outputting the power supply signal to the switching unit 121, causing the voltage to drop rapidly. When the voltage is lower than the conduction thresholds of the first switching transistor Q1 and the second switching transistor Q2, the first switching transistor Q1 and the second switching transistor Q2 will turn off.

[0062] In some embodiments, as Figure 2 shown, the switching unit 121 further includes: a first voltage stabilizing diode D3 and a second voltage stabilizing diode D5.

[0063] Among them, the first end of the first voltage stabilizing diode D3 is connected to the control end of the first switching transistor Q1, and the second end of the first voltage stabilizing diode D3 is connected to the second end of the first switching transistor Q1 and the second end of the second switching transistor Q2; the first end of the second voltage stabilizing diode D5 is connected to the control end of the second switching transistor Q2, and the second end of the second voltage stabilizing diode D5 is connected to the second end of the second switching transistor Q2 and the second end of the first switching transistor Q1. The first voltage stabilizing diode D3 and the second voltage stabilizing diode D5 are used to provide a stable voltage and prevent voltage fluctuations from affecting the circuit.

[0064] For example, the drains of the first switching transistor Q1 and the second switching transistor Q2 are connected in parallel and then connected to PV+, the sources are connected in parallel and then connected to OUT+, and the gates are connected in parallel and then connected to the cathodes of the first diode D1 and the second diode D2; the first voltage stabilizing diode D3 and the first pull-down resistor R1 are connected in parallel between the gate and the source of the first switching transistor Q1, the cathode of the first voltage stabilizing diode D3 is connected to the gate of the first switching transistor Q1, and the anode is connected to the source of the first switching transistor Q1; the second voltage stabilizing diode D5 and the second pull-down resistor R2 are connected in parallel between the gate and the source of the second switching transistor Q2, the cathode of the second voltage stabilizing diode D5 is connected to the gate of the second switching transistor Q2, and the anode is connected to the source of the second switching transistor Q2.

[0065] In some embodiments, as Figure 2 shown, the turn-off module 120 further includes: a bypass unit 122.

[0066] Among them, the first end of the bypass unit 122 is connected to the second end of the switching unit 121, and the second end of the bypass unit 122 is connected to the second end of the target photovoltaic cell or the second end of the voltage conversion module 130. The bypass unit 122 is used to conduct when the switching unit 121 in the turn-off module 120 fails.

[0067] Specifically, the bypass unit 122 is a key component in the photovoltaic system 100, mainly used to solve the hot spot effect problem of photovoltaic modules (solar panels) under partial shading or failure, and when the switching unit 121 in the turn-off module 120 fails, the bypass unit 122 conducts. The bypass unit 122 ensures the safety and power generation efficiency of the photovoltaic system 100. When some of the solar cells in the photovoltaic module are shaded (such as by shadows or dirt), the shaded solar cells will become loads and consume the current generated by other normal solar cells, resulting in local overheating. At this time, the bypass unit 122 conducts, allowing the current to bypass the faulty area and ensuring the safe and efficient operation of the photovoltaic system 100.

[0068] In some embodiments, as Figure 2 shown, the bypass unit 122 further includes: a first bypass diode D6.

[0069] Among them, the first end of the first bypass diode D6 is connected to the second end of the target photovoltaic cell, and the second end of the first bypass diode D6 is connected to the second end of the first switching tube Q1 and the second end of the second switching tube Q2. The first bypass diode D6 conducts when the switching unit 121 fails.

[0070] For example, the anode of the first bypass diode D6 is connected to the output node OUT- of this stage, and the cathode of the first bypass diode D6 is connected to the positive output node OUT+ of this stage. The function of the first bypass diode D6 is that when the photovoltaic panel of this stage is blocked, the entire string of photovoltaic modules can continue to flow through the first bypass diode D6, reducing energy loss and realizing the normal series connection of the upper and lower photovoltaic panels.

[0071] In some embodiments, as Figure 2 shown, the bypass unit 122 further includes: an absorption circuit 123.

[0072] Among them, the first end of the absorption circuit 123 is connected to the first end of the first bypass diode D6 and the second end of the target photovoltaic cell, and the second end of the absorption circuit 123 is connected to the second end of the first bypass diode D6. The absorption circuit 123 is used to absorb voltage.

[0073] In some embodiments, as Figure 2 shown, the absorption circuit 123 includes: a first capacitor C3, a first resistor R3, and a first bead B3.

[0074] Specifically, the first end of the first capacitor C3 is connected to the second end of the first bypass diode D6; the first end of the first resistor R3 is connected to the second end of the first capacitor C3; the first end of the first bead B3 is connected to the second end of the first resistor R3, and the second end of the first bead B3 is connected to the first end of the first bypass diode D6 and the second end of the target photovoltaic cell.

[0075] The first bead B3 in the absorption circuit 123 is mainly used to suppress high-frequency noise and electromagnetic interference to ensure the stable operation of the absorption circuit 123; after the first capacitor C3, the first resistor R3, and the first bead B3 are connected in series and then connected in parallel across the two ends of the first bypass diode D6, the function is to absorb the voltage spike across the two ends of the first bypass diode D6, reduce the voltage stress on the first bypass diode D6, and prevent the first bypass diode D6 from being broken down by voltage.

[0076] For example, when one or more of the shutdown modules 120 fail (cannot conduct), the entire photovoltaic system 100 can still operate normally to charge the energy storage battery. When one of the shutdown modules 120 fails, it can be connected to other photovoltaic cells through the bypass unit 122. At the same time, two switching tubes are connected in parallel to reduce the current-carrying burden of each and reduce the risk of thermal failure, improving the reliability of the shutdown module 120. Even if one of the switching tubes fails (opens), this shutdown module 120 can still operate, achieving a redundant effect.

[0077] In some embodiments, as Figure 2 shown, the shutdown module 120 further includes: a conversion unit 124.

[0078] Wherein, the first end of the conversion unit 124 is connected to the first end of the voltage conversion module 130, and the second end of the conversion unit 124 is connected to the control ends of the first switching tube Q1 and the second switching tube Q2. The conversion unit 124 is used to convert the power supply signal sent by the voltage conversion module 130 into the conduction voltage of the first switching tube Q1 and the second switching tube Q2.

[0079] Specifically, the shutdown module 120 is connected to the first end of the voltage conversion module 130 to be turned on and off according to the power supply signal. After the voltage conversion module 130 outputs a power supply signal to the first end of the shutdown module 120, the conversion unit 124 in the shutdown module 120 converts the power supply signal sent by the voltage conversion module 130 into the conduction voltage of the first switching tube Q1 and the second switching tube Q2, so that the first switching tube Q1 and the second switching tube Q2 are turned on.

[0080] In some embodiments, as Figure 2 shown, the conversion unit 124 includes: a driver U1, a transformer T, and a rectifier circuit 125.

[0081] Wherein, the input end of the driver U1 is connected to the first end of the voltage conversion module 130 to input the power supply signal. The driver U1 is used to convert the power supply signal into an AC signal. The primary coil of the transformer T is connected to the output end of the driver U1. The transformer T includes a first secondary coil T1 and a second secondary coil T2. The second end of the first secondary coil T1 and the first end of the second secondary coil T2 are connected to a common end. The common end is connected to the second ends of the first switching tube Q1, the second switching tube Q2, and the first end of the bypass unit 122. The transformer T is used to transmit the AC signal. The input end of the rectifier circuit 125 is connected to the first end of the first secondary coil T1 and the second end of the second secondary coil T2. The output end of the rectifier circuit 125 is connected to the control ends of the first switching tube Q1 and the second switching tube Q2. The rectifier circuit 125 is used to convert the AC signal into the conduction voltage.

[0082] Specifically, the shutdown module 120 is connected to the first end of the voltage conversion module 130 to turn on and off according to the power supply signal; after the voltage conversion module 130 outputs a power supply signal to the shutdown module 120 at its first end, the input end of the driver U1 receives the power supply signal, and the driver U1 converts the power supply signal into an AC signal for output. The AC signal output by the driver U1 is transformed and transmitted to the rectification circuit 125 through the transformer T. The rectification circuit 125 converts the AC signal into a conduction voltage and transmits it to the control ends of the first switching transistor Q1 and the second switching transistor Q2, causing the first switching transistor Q1 and the second switching transistor Q2 to conduct.

[0083] In some embodiments, as Figure 2 shown, the rectification circuit 125 includes: a first diode D1 and a second diode D2.

[0084] Wherein, the first end of the first diode D1 is connected to the first end of the first secondary coil T1, the first end of the second diode D2 is connected to the second end of the second secondary coil T2, and the second ends of the first diode D1 and the second diode D2 are connected at a node, and the node is connected to the control ends of the first switching transistor Q1 and the second switching transistor Q2.

[0085] Specifically, the transformer T transmits an AC signal to the rectification circuit 125, and the first diode D1 and the second diode D2 conduct alternately. In the positive half cycle of the AC signal, the first diode D1 conducts and the second diode D2 is cut off, and the current passes through the first diode D1; in the negative half cycle of the AC signal, the second diode D2 conducts and the first diode D1 is cut off, and the current passes through the second diode D2. The rectification circuit 125 has a relatively high transmission efficiency and a small output voltage fluctuation.

[0086] In some embodiments, the shutdown module 120 is integrated in the junction box of the target photovoltaic cell.

[0087] Specifically, the shutdown module 120 is integrated in the junction box of each independent photovoltaic cell to control the connection state between the target photovoltaic cell and the photovoltaic system 100. When the target photovoltaic cell fails or the photovoltaic module is abnormal, the shutdown module 120 cuts off the connection between the target photovoltaic cell and the photovoltaic system 100 to prevent the photovoltaic system 100 from collapsing and damage to the equipment.

[0088] In some embodiments, the shutdown module 120 further includes at least one second bypass diode (D4, D7, D8), and at least one second bypass diode (D4, D7, D8) is connected in parallel with the target photovoltaic cell.

[0089] Specifically, at least one second bypass diode (D4, D7, D8) in the existing photovoltaic module is welded in the junction box and then connected to the shutdown module 120 through a connector; as Figure 2As shown in the figure, in the present invention, the second bypass diodes (D4, D7, D8) in the photovoltaic module are integrated into the turn-off module 120, eliminating the connectors between them, saving space and cost, and making it more convenient for vehicle body layout.

[0090] For example, the second bypass diodes D4, D7, D8 are connected in series and then connected in parallel between the target photovoltaic cells PV+ and PV-. Different photovoltaic panels have different numbers of internal cell strings, so the number of diodes required is also different; the anode and cathode of the second bypass diode D7 are respectively connected to the 1 / 3 and 2 / 3 positions of the internal cells of the photovoltaic panel. (The photovoltaic bypass diode is a conventional circuit, Figure 2 and the internal cells of the photovoltaic panel in are divided into three strings). Figure 2 As shown in the figure, the circuit of the turn-off module 120 of the present invention includes: a driver U1, filter beads B1 and B2, a transformer T, a first diode D1, a second diode D2, filter capacitors C1, C2 and C4, second bypass diodes D4, D7 and D8, a first switching tube Q1, a second switching tube Q2, a first voltage stabilizing diode D3, a second voltage stabilizing diode D5, a first pull-down resistor R1, a second pull-down resistor R2, a first capacitor C3, a first resistor R3, and a first bead B3 which plays a role in absorbing voltage and is used to turn off the first bypass diode D6.

[0091] The working principle of the turn-off module 120 is as follows: after the voltage conversion module 130 outputs a power supply signal VCC, the VCC and EN pins of the driver U1 are powered on, and then the first diode D1 and the second diode D2 are alternately turned on, and the energy on the primary side is rectified by the first diode D1 and the second diode D2 through the isolation of the transformer T and transmitted to the capacitor C2 for charging, so that a stable voltage is generated at both ends of it, which is used to drive the first switching tube Q1 and the second switching tube Q2 and make them conduct; when the voltage conversion module 130 stops outputting the power supply signal VCC, the driver U1 stops working, the transformer T no longer transmits energy to the secondary side, and the electricity of the capacitor C2 will be consumed by the first pull-down resistor R1 and the second pull-down resistor R2, resulting in a rapid drop in the voltage at both ends of it. When the voltage at both ends of the capacitor C2 is lower than the conduction threshold of the first switching tube Q1 and the second switching tube Q2, the first switching tube Q1 and the second switching tube Q2 will turn off.

[0092] In some embodiments, as Figure 1 shown in the figure, the photovoltaic system 100 further includes: a light detection module 140.

[0093] Among them, the output end of the light detection module 140 is connected to the voltage conversion module 130, and is used to output a wake-up signal to the voltage conversion module 130 when the light reaches the light threshold to wake up the voltage conversion module 130.

[0094] Specifically, the light detection module 140 is not limited to detecting only the light of the end photovoltaic panel. The light detection module 140 can be a separate detection module that detects the overall ambient light, or it can detect the light condition of a certain photovoltaic cell. When the light detection module 140 detects that the light reaches the light threshold, it outputs a wake-up signal to the voltage conversion module 130, and the voltage conversion module 130 outputs a power supply signal to turn on the shutdown module 120, and the photovoltaic cell module 110 outputs electric energy outward. The light threshold can be understood as the detection value at which the light detection module 140 can send a wake-up signal to the voltage conversion module 130.

[0095] In some embodiments, as Figure 1 shown, the light detection module 140 includes a first detection end and a second detection end. The first detection end is connected to the first end of the end photovoltaic cell of the photovoltaic cell module 110, and the second detection end is connected to the second end of the end photovoltaic cell. The light detection module 140 is used to determine that the light reaches the light threshold when the output voltage of the end photovoltaic cell reaches the voltage threshold. Among them, the end photovoltaic cell is the photovoltaic cell at the end of the photovoltaic cell module 110 that is not connected to the second end of the voltage conversion module 130.

[0096] Specifically, as Figure 1 shown, in the present invention, the light detection module 140 is connected to both ends of the end photovoltaic cell. The light detection module 140 detects the output voltage of the end photovoltaic cell in real time. When the output voltage of the end photovoltaic cell reaches the voltage threshold, it is determined that the light reaches the light threshold. At this time, the light detection module 140 outputs a wake-up signal to the voltage conversion module 130, and the voltage conversion module 130 outputs a power supply signal to turn on the shutdown module 120, and the photovoltaic cell module 110 outputs electric energy outward. The voltage threshold can be understood as the voltage value for judging whether the light reaches the light threshold.

[0097] In some embodiments, the photovoltaic system 100 and / or the device where the photovoltaic system 100 is located does not meet the charging condition includes at least one of a failure of the energy storage battery connected to the voltage conversion module 130, a failure of the voltage conversion module 130 itself, and a failure of the device where the photovoltaic system 100 is located.

[0098] Specifically, to ensure the safety of the photovoltaic system 100 and the device where the photovoltaic system 100 is located, when at least one of the energy storage battery failure, the voltage conversion module 130 itself failure, and the device where the photovoltaic system 100 is located fails, the shutdown module 120 immediately disconnects to ensure the safety of the photovoltaic system 100.

[0099] In some embodiments, as Figure 1 shown, the photovoltaic system 100 further includes: a relay switch 150.

[0100] Specifically, the relay switch 150 is disposed on the connection line between the second end of the voltage conversion module 130 and the output end of the photovoltaic cell module 110. The power supply end of the relay switch 150 is connected to the voltage conversion module 130. The relay switch 150 is used to conduct when the photovoltaic system 100 and / or the device where the photovoltaic system 100 is located meets the charging condition.

[0101] For example, the photovoltaic system 100 of the present invention can be used in a vehicle to charge the energy storage battery of the vehicle. As shown in Figure 1 the photovoltaic system 100 includes: a voltage conversion module 130, a shutdown module 120, a light detection module 140, a relay switch 150, an energy storage battery, a photovoltaic cell module 110, and a vehicle controller.

[0102] When there is no light or the light is weak, the photovoltaic cell module 110 does not supply power externally; when there is no light, the terminal photovoltaic cell has no output voltage, the light detection module 140 cannot detect the voltage value and does not output a wake-up signal to the voltage conversion module 130, and the voltage conversion module 130 is in a sleep state; when the light is weak, the terminal photovoltaic cell has an output voltage, but the light detection module 140 detects that its voltage is less than the startup voltage, and the voltage conversion module 130 will not be awakened either.

[0103] After sufficient light, the terminal photovoltaic cell has an output voltage, and when the light detection module 140 detects that its voltage is greater than the startup voltage, it will wake up the voltage conversion module 130 through CAN (Controller Area Network) communication. The voltage conversion module 130 will communicate with the vehicle controller and the energy storage battery. After completing a series of self-checks, the energy storage battery will send a charging permission command to the voltage conversion module 130, and then the voltage conversion module 130 will output a power supply signal VCC and 12VCC to control the shutdown module 120 to conduct and the relay switch 150 to close, so as to connect all the photovoltaic cell modules to form a high voltage, and finally charge the energy storage battery through the voltage conversion module 130 for boost and maximum power point tracking regulation.

[0104] When the dynamic energy storage battery fails, a charging not allowed command will be sent to the voltage conversion module 130. The voltage conversion module 130 will enter the sleep state, and at the same time, disconnect the power supply signals VCC and 12VCC to turn off the shutdown module 120 and disconnect the relay switch 150, eliminating the high-voltage safety hazard; when the voltage conversion module 130 detects its own fault, the voltage conversion module 130 will enter the sleep state, and at the same time, disconnect the power supply signals VCC and 12VCC to turn off the shutdown module 120 and disconnect the relay switch 150, eliminating the high-voltage safety hazard; when the vehicle controller detects a collision signal, it will make the voltage conversion module 130 enter the sleep state through CAN communication, and at the same time, disconnect the power supply signals VCC and 12VCC to turn off the shutdown module 120 and disconnect the relay switch 150; eliminating the high-voltage safety hazard.

[0105] The second aspect embodiment of the present invention provides an electronic and electrical device, such as Figure 3 shown, the electronic and electrical device 200 includes a photovoltaic system 100.

[0106] Specifically, the electronic and electrical device 200 can be a vehicle, a ship or other devices that need power supply. In such devices, the inverter circuit or on-board charger mainly converts the grid signal to charge the energy storage battery. For example, it charges the power battery of the vehicle. Photovoltaic power generation is used as a supplement to the grid, and the inverter circuit or on-board charger is reused to realize the series connection control of the photovoltaic string, so that the photovoltaic string forms a high voltage to charge the power battery of the vehicle.

[0107] For the electronic and electrical device according to the embodiment of the present invention, the photovoltaic system includes photovoltaic battery components. When multiple series-connected photovoltaic batteries in the photovoltaic battery components can work normally, the shutdown module is quickly controlled to close by sending a power supply signal through the voltage conversion module. When a fault occurs or maintenance is required in multiple series-connected photovoltaic batteries in the photovoltaic battery components, the voltage conversion module stops sending the power supply signal, and the shutdown module disconnects, eliminating the safety hazard. The voltage conversion module sends a power supply signal to control the on / off of the shutdown module, without an additional control module, with a simple structure, fewer components, saving space and cost, and the shutdown module has a rapid switch and higher efficiency.

[0108] In some embodiments, the electronic and electrical device includes a vehicle, and the voltage conversion module of the photovoltaic system is the on-board charger of the vehicle.

[0109] Specifically, an on-vehicle charger is fixedly installed on a vehicle, which converts the electric energy conforming to the public power grid into direct current required by an on-vehicle energy storage device and charges the on-vehicle energy storage device. The on-vehicle charger of the present invention has a DC boost function and a maximum power point tracking function; the maximum power point tracking function is a technology for dynamically adjusting the operating point of a photovoltaic system (such as a solar panel) to make it always operate at the maximum power point, thereby maximizing the output power, solving the problem that the output characteristics of photovoltaic cells are affected by environmental factors such as light intensity and temperature, and ensuring the maximization of system efficiency.

[0110] For example, the photovoltaic system of the present invention can be used in a vehicle. The default initial states of the shutdown module and the relay switch are both off states. Only when the charging conditions are met, the on-vehicle charger will control the shutdown module and the relay switch to conduct, and the photovoltaic modules will be connected in series to form a high voltage; then it is given to the on-vehicle charger for boost and maximum power point tracking adjustment, and finally the power battery of the vehicle is charged. When the charging conditions are not met (insufficient light, power battery / on-vehicle charger failure, vehicle triggering a collision signal), the on-vehicle charger will control the shutdown module and the relay switch to disconnect to eliminate the high voltage safety hazard.

[0111] In some embodiments, as Figure 4 shown, the electronic and electrical equipment 200 further includes a vehicle controller 201.

[0112] Among them, the vehicle controller 201 is connected to the on-vehicle charger 202 to send vehicle fault information.

[0113] For example, the present invention relates to an on-vehicle photovoltaic high-voltage fast shutdown method. The whole system includes an on-vehicle charger, a shutdown module, a light detection module, a relay switch, a power battery, a photovoltaic panel, and a vehicle controller; the light detection module, the vehicle controller, the power battery, and the on-vehicle charger comprehensively determine whether the charging conditions are met. If the charging conditions are met, the on-vehicle charger will output a power supply signal to the shutdown module to make it conduct, so that the photovoltaic panels are connected in series to form a high-voltage power supply; when the charging conditions are not met, the on-vehicle charger will stop / not output a power supply signal, and the shutdown module will disconnect due to power outage; while realizing photovoltaic high-voltage charging and increasing the endurance, the present invention can effectively ensure the safety of the vehicle occupants, maintenance and fire-fighting personnel through fast shutdown of the high voltage, and the internal circuit of the shutdown module is simple, with few components, and the on-vehicle charger is reused without the need to additionally increase a control circuit.

[0114] In some embodiments, as Figure 5 shown, the electronic and electrical equipment 200 includes an inverter circuit module 210.

[0115] Among them, the voltage conversion module of the photovoltaic system is the inverter circuit module 210.

[0116] Specifically, the inverter circuit module is the core component of the inverter, responsible for converting direct current into alternating current. The inverter circuit converts direct current into alternating current by controlling the conduction and cutoff of power semiconductor devices, and can also achieve voltage conversion.

[0117] A third aspect embodiment of the present invention provides a vehicle, as Figure 6 shown, the vehicle 300 includes a photovoltaic system 100.

[0118] Specifically, the photovoltaic system 100 is provided in the vehicle 300. The photovoltaic system 100 can charge the power battery of the vehicle 300. Photovoltaic power generation serves as a supplement to the power grid. Both the photovoltaic system 100 and the power grid can charge the power battery of the vehicle 300.

[0119] In the vehicle according to the embodiment of the present invention, the photovoltaic system includes a photovoltaic cell module. When multiple serially connected photovoltaic cells in the photovoltaic cell module can all operate normally, the voltage conversion module sends a power supply signal to quickly control the closing of the cutoff module. When a fault occurs or maintenance is required in multiple serially connected photovoltaic cells in the photovoltaic cell module, the voltage conversion module stops sending the power supply signal, and the cutoff module disconnects, eliminating potential safety hazards. The voltage conversion module sends a power supply signal to control the on / off of the cutoff module, without the need for an additional control module, with a simple structure, fewer components, saving space and cost, and the cutoff module has a rapid switch and higher efficiency.

[0120] In some embodiments, as Figure 7 shown, the vehicle 300 further includes an on-vehicle charger 202.

[0121] Wherein, the on-vehicle charger 202 serves as the voltage conversion module in the photovoltaic system 100.

[0122] Specifically, the vehicle 300 includes an on-vehicle charger 202. The on-vehicle charger 202 is equivalent to the voltage conversion module in the photovoltaic system 100. When the charging conditions are met, the on-vehicle charger 202 will control the cutoff module and the relay switch in the photovoltaic system 100 to conduct, and the photovoltaic modules will be connected in series to form a high voltage to charge the power battery of the vehicle 300; when the charging conditions are not met, the on-vehicle charger 202 will control the cutoff module and the relay switch to disconnect, eliminating the high voltage safety hazard.

[0123] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0124] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A photovoltaic system, characterized in that, Comprising: A photovoltaic cell module, the photovoltaic cell module including a plurality of the photovoltaic cells connected in series; At least one shutdown module, the shutdown module being connected between two adjacent ones of the photovoltaic cells in the photovoltaic cell module; A voltage conversion module, a first end of the voltage conversion module being connected to each of the shutdown modules, the voltage conversion module being configured to control the on / off state of the shutdown module based on a power supply signal to the shutdown module.

2. The photovoltaic system according to claim 1, characterized in that, A second end of the voltage conversion module is connected to an output end of the photovoltaic cell module, and a shutdown module is further provided between the second end of the voltage conversion module and the output end of the photovoltaic cell module, the shutdown module being connected to the first end of the voltage conversion module to be turned on and off based on the power supply signal.

3. The photovoltaic system according to claim 1, characterized in that, A third end of the voltage conversion module is adapted to be connected to a storage battery, and the voltage conversion module is further configured to convert an electric energy signal output by the photovoltaic cell module into an electric energy signal required for charging the storage battery when the shutdown module is in a conducting state.

4. The photovoltaic system according to any one of claims 1-3, characterized in that, When the photovoltaic system and / or the device where the photovoltaic system is located meets the charging condition, the first end of the voltage conversion module outputs a power supply signal to each of the shutdown modules to cause each of the shutdown modules to conduct, or when the photovoltaic system and / or the device where the photovoltaic system is located does not meet the charging condition, no power supply signal is output from the first end of the voltage conversion module to cause each of the shutdown modules to be in an off state.

5. The photovoltaic system according to claim 2, characterized in that, The shutdown module includes: A switch unit, a first end of the switch unit being connected to a first end of a corresponding target photovoltaic cell, a second end of the switch unit being connected to a second end of an adjacent photovoltaic cell of the target photovoltaic cell or a second end of the voltage conversion module, and a control end of the switch unit being connected to the first end of the voltage conversion module, the switch unit being configured to control a connection state between the target photovoltaic cell and the adjacent photovoltaic cell or the voltage conversion module.

6. The photovoltaic system according to claim 5, wherein, The switch unit includes: A first switch transistor, a first end of the first switch transistor being connected to the first end of the corresponding photovoltaic cell, a second end of the first switch transistor being connected to the second end of the adjacent photovoltaic cell or the second end of the voltage conversion module, and a control end of the first switch transistor being configured to control the first switch transistor to conduct when a conduction voltage signal is input, wherein the conduction voltage signal is obtained based on the power supply signal sent by the voltage conversion module; A second switch transistor, a first end of the second switch transistor being connected to the first end of the first switch transistor, a second end of the second switch transistor being connected to the second end of the first switch transistor, and a control end of the second switch transistor being configured to control the second switch transistor to conduct when the conduction voltage signal is input.

7. The photovoltaic system according to claim 6, characterized in that, The switch unit further includes: A first pull-down resistor, a first end of the first pull-down resistor being connected to the control end of the first switch transistor, and a second end of the first pull-down resistor being connected to the second end of the first switch transistor and the second end of the second switch transistor; A second pull-down resistor, a first end of the second pull-down resistor is connected to a control end of the second switching tube, and a second end of the second pull-down resistor is connected to a second end of the second switching tube and a second end of the first switching tube.

8. The photovoltaic system according to claim 6, characterized in that, The switching unit further includes: A first voltage stabilizing diode, a first end of the first voltage stabilizing diode is connected to a control end of the first switching tube, and a second end of the first voltage stabilizing diode is connected to a second end of the first switching tube and a second end of the second switching tube; A second voltage stabilizing diode, a first end of the second voltage stabilizing diode is connected to a control end of the second switching tube, and a second end of the second voltage stabilizing diode is connected to a second end of the second switching tube and a second end of the first switching tube.

9. The photovoltaic system according to claim 6, wherein, The turn-off module further includes: A bypass unit, a first end of the bypass unit is connected to a second end of the switching unit, and a second end of the bypass unit is connected to a second end of the target photovoltaic cell or a second end of the voltage conversion module. The bypass unit is configured to conduct when a switching unit in the turn-off module fails.

10. The photovoltaic system according to claim 9, characterized in that, The bypass unit includes: A first bypass diode, a first end of the first bypass diode is connected to a second end of the target photovoltaic cell, and a second end of the first bypass diode is connected to a second end of the first switching tube and a second end of the second switching tube. The first bypass diode conducts when the switching unit fails.

11. The photovoltaic system according to claim 10, wherein, The bypass unit further includes: An absorption circuit, a first end of the absorption circuit is connected to a first end of the first bypass diode and a second end of the target photovoltaic cell, and a second end of the absorption circuit is connected to a second end of the first bypass diode. The absorption circuit is configured to absorb voltage.

12. The photovoltaic system according to claim 11, characterized in that, The absorption circuit includes: A first capacitor, a first end of the first capacitor is connected to a second end of the first bypass diode; A first resistor, a first end of the first resistor is connected to a second end of the first capacitor; A first magnetic bead, a first end of the first magnetic bead is connected to a second end of the first resistor, and a second end of the first magnetic bead is connected to a first end of the first bypass diode and a second end of the target photovoltaic cell.

13. The photovoltaic system according to claim 9, characterized in that, The turn-off module further includes: A conversion unit, a first end of the conversion unit is connected to a first end of the voltage conversion module, and a second end of the conversion unit is connected to a control end of the first switching tube and a control end of the second switching tube. The conversion unit is configured to convert the power supply signal sent by the voltage conversion module into a turn-on voltage of the first switching tube and the second switching tube.

14. The photovoltaic system according to claim 13, characterized in that, The conversion unit includes: A driver, an input end of the driver is connected to a first end of the voltage conversion module to input the power supply signal. The driver is configured to convert the power supply signal into an alternating current signal; A transformer, the primary coil of the transformer is connected to the output end of the driver, the transformer includes a first secondary coil and a second secondary coil, the second end of the first secondary coil and the first end of the second secondary coil are connected to a common end, the common end is connected to the second end of the first switching tube, the second end of the second switching tube, and the first end of the bypass unit, and the transformer is used to transmit the AC signal; A rectifying circuit, the input end of the rectifying circuit is connected to the first end of the first secondary coil and the second end of the second secondary coil, and the output end of the rectifying circuit is connected to the control ends of the first switching tube and the second switching tube, and the rectifying circuit is used to convert the AC signal into the conduction voltage.

15. The photovoltaic system according to claim 14, wherein The rectifying circuit includes: A first diode and a second diode, the first end of the first diode is connected to the first end of the first secondary coil, the first end of the second diode is connected to the second end of the second secondary coil, the second end of the first diode and the second end of the second diode are connected to a node, and the node is connected to the control ends of the first switching tube and the second switching tube.

16. The photovoltaic system according to any one of claims 5-15, characterized in that, The turn-off module is integrated in the junction box of the target photovoltaic cell.

17. The photovoltaic system according to any one of claims 5-15, characterized in that, The turn-off module further includes at least one second bypass diode, and the at least one second bypass diode is connected in parallel with the target photovoltaic cell.

18. The photovoltaic system according to claim 1 or 2, characterized in that, The photovoltaic system further includes: A light detection module, the output end of the light detection module is connected to the voltage conversion module, and is used to output a wake-up signal to the voltage conversion module when the light reaches the light threshold to wake up the voltage conversion module.

19. The photovoltaic system according to claim 18, wherein The light detection module includes a first detection end and a second detection end, the first detection end is connected to the first end of the terminal photovoltaic cell of the photovoltaic cell module, the second detection end is connected to the second end of the terminal photovoltaic cell, and the light detection module is used to determine that the light reaches the light threshold when the output voltage of the terminal photovoltaic cell reaches the voltage threshold; Wherein, the terminal photovoltaic cell is the photovoltaic cell at the end of the photovoltaic cell module that is not connected to the second end of the voltage conversion module.

20. The photovoltaic system according to claim 4, characterized in that, The photovoltaic system and / or the device where the photovoltaic system is located does not meet the charging condition includes at least one of a failure of the energy storage battery connected to the voltage conversion module, a failure of the voltage conversion module itself, and a failure of the device where the photovoltaic system is located.

21. The photovoltaic system according to claim 2, wherein The photovoltaic system further includes: A relay switch, the relay switch is arranged on the connection line between the second end of the voltage conversion module and the output end of the photovoltaic cell module, the power supply end of the relay switch is connected to the voltage conversion module, and the relay switch is used to conduct when the photovoltaic system and / or the device where the photovoltaic system is located meets the charging condition.

22. An electronic and electrical device, characterized in that, The electronic and electrical device includes the photovoltaic system according to any one of claims 1-21.

23. The electronic and electrical equipment according to claim 22, characterized in that, The electronic and electrical device includes a vehicle, and the voltage conversion module of the photovoltaic system is an on-vehicle charger of the vehicle.

24. The electronic and electrical device according to claim 23, characterized in that, The electronic and electrical equipment further includes a vehicle controller, and the vehicle controller is connected to the on-vehicle charger to send vehicle fault information.

25. The electronic and electrical device according to claim 22, characterized in that, The electronic and electrical equipment includes an inverter circuit module, and the voltage conversion module of the photovoltaic system is the inverter circuit module.

26. A vehicle, characterized in that, The vehicle includes the photovoltaic system according to any one of claims 1-21.

27. The vehicle according to claim 26, characterized in that, The vehicle further includes an on-vehicle charger, and the on-vehicle charger serves as the voltage conversion module in the photovoltaic system.

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