Photovoltaic component shut-off circuit and photovoltaic device

Abstract

The present invention discloses a photovoltaic component shutdown circuit, including a first on-off switch tube, a voltage module, a first drive module and a control chip; the voltage module is used to obtain a chip power supply voltage according to the output voltage of the controlled photovoltaic component; the control chip is used to send a pending circuit breaker control voltage signal to the first drive module; the first drive module is used to obtain a circuit breaker control voltage signal; the first on-off switch tube is connected in series with the controlled photovoltaic component, and is used to determine the on-off of the output end of the controlled photovoltaic component and the external circuit according to the circuit breaker control voltage signal. By regulating the output voltage of the controlled photovoltaic component, the present invention avoids the situation that the shutdown circuit of a photovoltaic device with multiple components connected in series must use a high-voltage chip to match the high voltage after the multiple components are connected in series, thereby reducing the difficulty and risk of chip design and production and reducing the production cost of the chip. The present invention also provides a photovoltaic device with the above-mentioned beneficial effects.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaics, and in particular to a photovoltaic component shutdown circuit and a photovoltaic device. Background Art

[0002] Due to the renewable and clean nature of solar energy, photovoltaic grid-connected power generation technology has developed rapidly. A common photovoltaic system is a series of multiple photovoltaic modules connected in series to form a string, which is then connected to an inverter to convert DC to AC and connect to the grid. The series-connected photovoltaic modules form a DC high voltage, which can cause personal danger and fire accidents. The on-site photovoltaic system requires the inverter to have arc protection, that is, the inverter should be shut down immediately when an arc is detected. However, even if the inverter stops running, the DC cable after the photovoltaic modules are connected in series will still output high voltage electricity, which poses a safety risk. Therefore, the safest approach is to have a control function to shut down the output voltage of each photovoltaic module, so that the DC high voltage should be completely eliminated. Usually, a circuit breaker is added behind each module, the output of the circuit breaker is connected in series, connected to the inverter, and then the switch inside the circuit breaker is controlled by the circuit breaker controller to disconnect, so that the voltage on the DC cable is very low.

[0003] With the requirement to reduce system costs, it is now proposed to increase the maximum voltage in the photovoltaic array from 80V to 160V, that is, to allow two modules to be connected in series. In response to such requirements, the existing technology replaces the chip in the circuit breaker with a chip with a higher voltage resistance. However, for the input voltage of 160V, a chip design and process with a very high voltage resistance is required, which is difficult, greatly increases the chip cost, reduces the chip performance, and more importantly, greatly increases the safety risk of the circuit.

[0004] Therefore, how to find a design method for a shutdown circuit with low cost and high safety has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a photovoltaic module shutdown circuit and a photovoltaic device to solve the problems of high cost and poor safety of the shutdown circuit of the high-voltage photovoltaic module in the prior art.

[0006] In order to solve the above technical problems, the present invention provides a photovoltaic module shutdown circuit, including a first on-off switch tube, a voltage module, a first drive module and a control chip;

[0007] The voltage module is used to obtain the chip power supply voltage according to the output voltage of the controlled photovoltaic module to supply power to the control chip;

[0008] The control chip is used to send a circuit breaker control voltage signal to be processed to the first driving module when an arc signal is detected;

[0009] The first driving module is used to obtain a circuit breaking control voltage signal according to the circuit breaking control voltage signal to be processed, and send the circuit breaking control voltage signal to the first on-off switch tube;

[0010] The first on-off switch tube is connected in series with the controlled photovoltaic component, and is used to determine the on-off of the output end of the controlled photovoltaic component and the external circuit according to the circuit-breaking control voltage signal.

[0011] Optionally, in the photovoltaic assembly shutdown circuit, the positive electrode of the controlled photovoltaic assembly is connected to the first end of the voltage module and the source electrode of the first on-off switch tube respectively;

[0012] The second end of the voltage module is connected to the input end of the control chip;

[0013] The first signal output terminal of the control chip is connected to the input terminal of the first driving module; the voltage output terminal of the control chip is connected to the voltage input terminal of the first driving module; the parallel power supply terminal of the control chip is connected to the negative pole of the controlled photovoltaic module;

[0014] The signal end of the first driving module is connected to the gate of the on-off switch tube, the first collecting end of the first driving module is connected to the source of the on-off switch tube, and the second collecting end of the first driving module is connected to the drain of the on-off switch tube; the parallel power supply end of the first driving module is connected to the negative pole of the controlled photovoltaic component.

[0015] Optionally, in the photovoltaic module shutdown circuit, the voltage module may be any one of a DCDC chip, an LDO chip or a photovoltaic buck circuit.

[0016] Optionally, in the photovoltaic module shutdown circuit, the photovoltaic step-down circuit includes a first resistor, a second resistor, a third resistor, a first capacitor, a first transistor, and a first voltage stabilizing diode;

[0017] The positive electrode of the controlled photovoltaic assembly is respectively connected to the first end of the first resistor and the collector of the first transistor;

[0018] The second end of the first resistor is respectively connected to the first end of the second resistor, the cathode of the voltage zener diode and the first end of the third resistor;

[0019] The second end of the third resistor and the positive electrode of the voltage stabilizing diode are grounded;

[0020] The second end of the second resistor is connected to the base of the first transistor;

[0021] The emitter of the first transistor is connected to the first end of the first capacitor and the input end of the control chip respectively;

[0022] The second terminal of the first capacitor is grounded.

[0023] Optionally, in the photovoltaic assembly shutdown circuit, the first driving module may be any one of a digital isolator, an isolation optocoupler or a photovoltaic driving circuit.

[0024] Optionally, in the photovoltaic assembly shutdown circuit, the photovoltaic drive circuit includes a boost module, a fourth resistor, a fifth resistor, a sixth resistor, a second voltage regulator diode, a first diode, a first drive switch tube and a second drive switch tube;

[0025] The input end of the boost module is connected to the source of the first on-off switch tube, the parallel power supply end of the boost module is grounded, and the output end of the boost module is connected to the first end of the fourth resistor;

[0026] The second end of the fourth resistor is respectively connected to the gate of the first on-off switch tube, the drain of the first driving switch tube and the cathode of the first diode;

[0027] The anode of the first diode is connected to the anode of the second voltage stabilizing diode; the cathode of the second voltage stabilizing diode is connected to the source of the first on-off switch tube;

[0028] The voltage output end of the control chip is connected to the first end of the fifth resistor, the second end of the fifth resistor is respectively connected to the drain of the second drive switch tube and the first end of the sixth resistor; the second end of the sixth resistor is connected to the gate of the first drive switch tube, and the source of the first drive switch tube is grounded;

[0029] The first signal output terminal of the control chip is connected to the gate of the second driving switch tube; the source of the second driving switch tube is grounded.

[0030] Optionally, in the photovoltaic assembly shutdown circuit, the photovoltaic assembly shutdown circuit further includes a first bypass switch tube;

[0031] The drain of the first bypass switch tube is connected to the source of the first on-off switch tube, the source of the first bypass switch tube is connected to the negative electrode of the controlled photovoltaic component, and the gate of the first bypass switch tube is connected to the second signal output terminal of the control chip.

[0032] Optionally, in the photovoltaic assembly shutdown circuit, when there is a series-connected photovoltaic assembly connected in series with the controlled photovoltaic assembly, the photovoltaic assembly shutdown circuit further includes a second driving module corresponding to the series-connected photovoltaic assembly, a second bypass switch tube corresponding to the series-connected photovoltaic assembly, and a second on-off switch tube corresponding to the series-connected photovoltaic assembly;

[0033] The drain of the second bypass switch tube is connected to the source of the second on-off switch tube, the source of the second bypass switch tube is connected to the negative electrode of the series-connected photovoltaic assembly, and the gate of the second bypass switch tube is connected to the signal output end of the second driving module;

[0034] The drain of the second on-off switch tube is connected to the positive electrode of the series-connected photovoltaic assembly, and the gate of the second on-off switch tube is connected to the third signal output terminal of the control chip;

[0035] The voltage input terminal of the second driving module is connected to the voltage output terminal of the control chip, and the signal input terminal of the second driving module is connected to the fourth signal output terminal of the control chip.

[0036] Optionally, in the photovoltaic assembly shutdown circuit, the second driving module includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second transistor, a third transistor and a third voltage stabilizing diode;

[0037] The first end of the tenth resistor is respectively connected to the voltage output end of the control chip and the emitter of the second transistor; the second end of the tenth resistor is respectively connected to the first end of the seventh resistor and the collector of the third transistor;

[0038] The base of the third triode is connected to the fourth signal output terminal of the control chip, and the emitter of the third triode is grounded;

[0039] The second end of the seventh resistor is connected to the base of the second transistor;

[0040] The collector of the second triode is connected to the first end of the eighth resistor;

[0041] The second end of the eighth resistor is respectively connected to the gate of the second bypass switch tube, the first end of the ninth resistor and the cathode of the third voltage stabilizing diode;

[0042] The anode of the third voltage stabilizing diode is connected to the cathode of the series-connected photovoltaic assembly;

[0043] The second end of the ninth resistor is connected to the negative electrode of the series-connected photovoltaic assembly.

[0044] A photovoltaic device comprises the photovoltaic component shut-down circuit as described in any one of the above.

[0045] The photovoltaic module shutdown circuit provided by the present invention includes a first on-off switch tube, a voltage module, a first drive module and a control chip; the voltage module is used to obtain a chip power supply voltage according to the output voltage of the controlled photovoltaic module, and power the control chip; the control chip is used to send a pending circuit breaker control voltage signal to the first drive module when an arc signal is detected; the first drive module is used to obtain a circuit breaker control voltage signal according to the pending circuit breaker control voltage signal, and send the circuit breaker control voltage signal to the first on-off switch tube; the first on-off switch tube is connected in series with the controlled photovoltaic module, and is used to determine the on-off of the output end of the controlled photovoltaic module and the external circuit according to the circuit breaker control voltage signal.

[0046] The photovoltaic module shutdown circuit provided by the present invention regulates the output voltage of the controlled photovoltaic module through the voltage module to obtain the chip power supply voltage that can be directly used by the control chip, thus avoiding the shutdown circuit of the photovoltaic device with multiple components in series must use the high-voltage chip to match the high voltage electricity after the multiple components are connected in series, so that the general low-voltage chip can also be used for the photovoltaic device with multiple components in series. At the same time, since the output voltage signal of the low-voltage chip is also low, it is not enough to directly drive the first on-off switch tube connected in series with the controlled photovoltaic module. Therefore, the present invention also adds the first driving module, so that the electrical signal emitted by the control chip is isolated and converted to obtain the circuit-breaking control signal that can drive the first on-off switch tube, so as to realize the use of the low-voltage chip in the high-voltage photovoltaic device with multiple components in series. Compared with the prior art, the difficulty and risk of chip design and production are greatly reduced, and the production cost of the chip is reduced. The present invention also provides a photovoltaic device with the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 A circuit diagram of a photovoltaic module circuit breaker in the prior art;

[0049] Figure 2 A circuit diagram of another photovoltaic module circuit breaker in the prior art;

[0050] Figure 3 A schematic diagram of a circuit structure of a specific implementation of a photovoltaic module shutdown circuit provided by the present invention;

[0051] Figure 4A schematic diagram of the circuit structure of another specific implementation of the photovoltaic module shutdown circuit provided by the present invention;

[0052] Figure 5 A schematic diagram of a circuit structure of another specific implementation of a photovoltaic module shutdown circuit provided by the present invention;

[0053] Figure 6 A schematic diagram of a partial circuit structure of a specific implementation of a photovoltaic module shutdown circuit provided by the present invention;

[0054] Figure 7 A schematic diagram of a partial circuit structure of another specific implementation of a photovoltaic module shutdown circuit provided by the present invention;

[0055] Figure 8 A schematic diagram of a partial circuit structure of another specific implementation of the photovoltaic module shutdown circuit provided by the present invention;

[0056] Fig. 9 A schematic diagram of the relationship between a control signal to be processed sent by a control chip to a second driving module and a control signal processed by the second driving module in a specific embodiment of a photovoltaic module shutdown circuit provided by the present invention;

[0057] Fig.10 A schematic diagram of the relationship between a to-be-processed circuit breaker control voltage signal and the circuit breaker control voltage signal of a specific implementation manner of a photovoltaic assembly shutdown circuit provided by the present invention. DETAILED DESCRIPTION

[0058] The circuit breaker circuit in the prior art is as follows: Figure 1 As shown, it usually includes main switch tubes BM1 and BM2, control chip BU1, PLC communication module and bypass diodes BD1 / BD2. The input of BU1 is connected to 1-way input PV2, and the voltage is the voltage of a component, and the existing standard is <=80V. BU1 has multiple functions of the breaker chip, such as bg1 and bg2 outputs, which provide drive for the switch tubes BM1 / BM2 respectively. BU1 has an output connected to the output Vout+, which can provide a low-voltage output voltage and a small drive current when the switch tube is disconnected. BU1 can also have functions such as backflow current detection and control, over-temperature protection, and bypass MOS switch control. Each input and output pin of BU1 must meet the voltage withstand requirements.

[0059] With the requirement to reduce system costs, it is now proposed to increase the maximum voltage in the photovoltaic array from 80V to 160V, that is, to allow two modules to be connected in series. In response to such requirements, a design such as Figure 2As shown, the circuit is the same as the existing 80V, but BU1 is replaced with a higher voltage chip BU1-HV. For an input voltage of 160V, a very high voltage chip design and process are required, which is difficult and greatly increases the chip cost and reduces performance. Therefore, this application is committed to solving the problems of high cost and low safety in the prior art.

[0060] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0061] The core of the present invention is to provide a photovoltaic module shutdown circuit, a structural schematic diagram of a specific implementation method thereof is shown as follows: Figure 3 As shown, it includes a first on-off switch tube M1, a voltage module VM1, a first driving module DCM1 and a control chip U1;

[0062] The voltage module VM1 is used to obtain the chip power supply voltage according to the output voltage of the controlled photovoltaic module to supply power to the control chip U1;

[0063] The control chip U1 is used to send a circuit breaker control voltage signal to be processed to the first driving module DCM1 when an arc signal is detected;

[0064] The first driving module DCM1 is used to obtain a circuit breaking control voltage signal according to the circuit breaking control voltage signal to be processed, and send the circuit breaking control voltage signal to the first on-off switch tube M1;

[0065] The first on-off switch tube M1 is connected in series with the controlled photovoltaic component, and is used to determine the on-off of the output end of the controlled photovoltaic component and the external circuit according to the circuit-breaking control voltage signal.

[0066] Since the control chip U1 is connected to the controlled photovoltaic component through the voltage module VM1 and the first drive module DCM1, if the voltage requirement in the system continues to change, it is only necessary to adjust the parameters of the voltage module VM1 and the first drive module DCM1 without changing the control chip U1.

[0067] Figure 3 A circuit structure corresponding to the above structure, wherein the positive electrode of the controlled photovoltaic module is respectively connected to the first end of the voltage module VM1 and the source electrode of the first on-off switch tube M1;

[0068] The second end of the voltage module VM1 is connected to the input end of the control chip U1;

[0069] The first signal output terminal of the control chip U1 is connected to the input terminal of the first driving module DCM1; the voltage output terminal of the control chip U1 is connected to the voltage input terminal of the first driving module DCM1; the parallel power supply terminal of the control chip U1 is connected to the negative pole of the controlled photovoltaic module;

[0070] The signal end of the first driving module DCM1 is connected to the gate of the on-off switch tube, the first collecting end of the first driving module DCM1 is connected to the source of the on-off switch tube, and the second collecting end of the first driving module DCM1 is connected to the drain of the on-off switch tube; the parallel power supply end of the first driving module DCM1 is connected to the negative electrode of the controlled photovoltaic component.

[0071] It should be noted that Figure 3 PV3 and PV4 in the figure are two photovoltaic modules connected in series, and the two are collectively referred to as the controlled photovoltaic module.

[0072] For the convenience of expression, the first signal output terminal of the control chip U1 is called g1, the voltage signal received by the control chip U1 from the voltage module VM1 is V1, and the electrical signal output by the control chip U1 through the voltage output terminal is V2; Vout+ and Vout- in the figure represent the output terminals of the controlled photovoltaic components connected to the external circuit.

[0073] In addition, the voltage module VM1 can be any one of a DCDC chip, an LDO chip or a photovoltaic buck circuit.

[0074] Furthermore, the first driving module DCM1 may be any one of a digital isolator, an isolation optocoupler or a photovoltaic driving circuit.

[0075] As a preferred implementation, the circuit structure diagram is as follows: Figure 4 As shown, the photovoltaic assembly shutdown circuit also includes a first bypass switch tube M3;

[0076] The drain of the first bypass switch tube M3 is connected to the source of the first on-off switch tube M1, the source of the first bypass switch tube M3 is connected to the negative electrode of the controlled photovoltaic component, and the gate of the first bypass switch tube M3 is connected to the second signal output terminal of the control chip U1.

[0077] Compared with the bypass diode in the prior art, the first bypass switch tube M3 has better protection performance and improves the overall working stability of the system. For the convenience of description, the second signal output terminal of the control chip U1 is called g2.

[0078] Furthermore, when there is a series-connected photovoltaic component connected in series with the controlled photovoltaic component, the photovoltaic component shutdown circuit further includes a second driving module DCM2 corresponding to the series-connected photovoltaic component, a second bypass switch tube M4 corresponding to the series-connected photovoltaic component, and a second on-off switch tube M2 corresponding to the series-connected photovoltaic component, and its structural schematic diagram is shown in FIG. Figure 5 As shown;

[0079] The drain of the second bypass switch tube M4 is connected to the source of the second on-off switch tube M2, the source of the second bypass switch tube M4 is connected to the negative electrode of the series-connected photovoltaic assembly, and the gate of the second bypass switch tube M4 is connected to the signal output end of the second driving module DCM2;

[0080] The drain of the second on-off switch tube M2 is connected to the positive electrode of the series-connected photovoltaic assembly, and the gate of the second on-off switch tube M2 is connected to the third signal output terminal of the control chip U1;

[0081] The voltage input terminal of the second driving module DCM2 is connected to the voltage output terminal of the control chip U1 , and the signal input terminal of the second driving module DCM2 is connected to the fourth signal output terminal of the control chip U1 .

[0082] The series-connected photovoltaic assembly is connected in series with the controlled photovoltaic assembly. Therefore, the second bypass switch tube M4 of the series-connected assembly is controlled by the control chip U1. It is necessary to consider the voltage drop between the controlled photovoltaic assembly and the series-connected photovoltaic assembly. In order to enable the low-voltage chip to also control the series-connected photovoltaic assembly of the high-voltage circuit, it is necessary to add the second drive module DCM2 between the second bypass switch tube M4 and the control chip U1 to adjust the output voltage of the control chip U1 and realize the control of the second bypass switch tube M4.

[0083] For the convenience of description, the third signal output terminal of the control chip U1 is called g3, and the fourth signal output terminal is called g4.

[0084] Fig. 9 In a specific implementation manner, the diagram is a schematic diagram of the relationship between the control signal to be processed sent by the control chip U1 to the second driving module DCM2 via g4 and the control signal Vg4 processed by the second driving module DCM2, which shows that the two signals have the same phase but different magnitudes.

[0085] It should be noted that the switch tube in the present invention can be a MOS tube as shown in the figure, or it can be other devices with the same function, such as IGBT, thyristor, triode, relay, etc. Of course, if it is changed to other devices, the corresponding interface name will also change accordingly. For example, when a triode is used, the "gate" in the text should be changed to "base", the "drain" should be changed to "collector", and the "emitter" should be changed to "source".

[0086] The present invention also provides a specific implementation of the second driving module DCM2, and its circuit structure diagram is shown in FIG. Figure 6 As shown, the second driving module DCM2 includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a second transistor Q2, a third transistor Q3 and a third voltage stabilizing diode Z3;

[0087] The first end of the tenth resistor R10 is respectively connected to the voltage output end of the control chip U1 and the emitter of the second transistor Q2; the second end of the tenth resistor R10 is respectively connected to the first end of the seventh resistor R7 and the collector of the third transistor Q3;

[0088] The base of the third transistor Q3 is connected to the fourth signal output terminal of the control chip U1, and the emitter of the third transistor Q3 is grounded;

[0089] The second end of the seventh resistor R7 is connected to the base of the second transistor Q2;

[0090] The collector of the second transistor Q2 is connected to the first end of the eighth resistor R8;

[0091] The second end of the eighth resistor R8 is respectively connected to the gate of the second bypass switch tube M4, the first end of the ninth resistor R9 and the cathode of the third voltage stabilizing diode Z3;

[0092] The anode of the third voltage stabilizing diode Z3 is connected to the cathode of the series-connected photovoltaic assembly;

[0093] The second end of the ninth resistor R9 is connected to the negative electrode of the series-connected photovoltaic assembly.

[0094] The second driving module DCM2 described above constitutes a controllable current source, and there is no need to set up a separate secondary side power supply circuit for the second bypass switch tube M4, which greatly saves space, is conducive to the integration of photovoltaic equipment, reduces equipment complexity and cost, and improves working stability.

[0095] Figure 6PV1 and PV2 in the figure are two components in the series-connected photovoltaic components, and Vgs4 in the figure represents the voltage between the gate of the second bypass switch tube M4 and the negative electrode of the series-connected photovoltaic components.

[0096] The photovoltaic module shutdown circuit provided by the present invention includes a first on-off switch tube M1, a voltage module VM1, a first drive module DCM1 and a control chip U1; the voltage module VM1 is used to obtain a chip power supply voltage according to the output voltage of the controlled photovoltaic module, and power the control chip U1; the control chip U1 is used to send a pending circuit breaking control voltage signal to the first drive module DCM1 when an arc signal is detected; the first drive module DCM1 is used to obtain a circuit breaking control voltage signal according to the pending circuit breaking control voltage signal, and send the circuit breaking control voltage signal to the first on-off switch tube M1; the first on-off switch tube M1 is connected in series with the controlled photovoltaic module, and is used to determine the on-off of the output end of the controlled photovoltaic module and the external circuit according to the circuit breaking control voltage signal. The photovoltaic component shutdown circuit provided by the present invention regulates the output voltage of the controlled photovoltaic component through the voltage module VM1 to obtain the chip power supply voltage that can be directly used by the control chip U1, thereby avoiding the shutdown circuit of the photovoltaic device with multiple components connected in series must use a high-voltage chip to cooperate with the high voltage after the multiple components are connected in series, so that general low-voltage chips can also be used for photovoltaic devices with multiple components connected in series. At the same time, since the output voltage signal of the low-voltage chip is also relatively low and is not enough to directly drive the first on-off switch tube M1 connected in series with the controlled photovoltaic component, the present invention further adds the first driving module DCM1, so that the electrical signal emitted by the control chip U1 is isolated and converted to obtain the circuit-breaking control signal that can drive the first on-off switch tube M1, thereby realizing the use of low-voltage chips in high-voltage photovoltaic devices with multiple components connected in series. Compared with the prior art, the difficulty and risk of chip design and production are greatly reduced, and the production cost of the chip is also reduced.

[0097] On the basis of the basic circuit structure of the specific implementation mode 1, a specific structure of a photovoltaic buck circuit is further given, which is called the specific implementation mode 2, wherein the voltage module VM1 is the photovoltaic buck module, and the remaining structures are the same as the above specific implementation mode, which will not be elaborated here. The structural schematic diagram of the photovoltaic buck module is shown in Figure 7 As shown, it includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a first transistor Q1, and a first voltage stabilizing diode Z1;

[0098] The positive electrode of the controlled photovoltaic assembly is respectively connected to the first end of the first resistor R1 and the collector of the first transistor Q1;

[0099] The second end of the first resistor R1 is respectively connected to the first end of the second resistor R2, the cathode of the voltage zener diode and the first end of the third resistor R3;

[0100] The second end of the third resistor R3 and the positive electrode of the voltage stabilizing diode are grounded;

[0101] The second end of the second resistor R2 is connected to the base of the first transistor Q1;

[0102] The emitter of the first transistor Q1 is connected to the first end of the first capacitor C1 and the input end of the control chip U1 respectively;

[0103] A second terminal of the first capacitor C1 is grounded.

[0104] In this specific implementation, a voltage module VM1 is specifically provided as the photovoltaic buck circuit. In the photovoltaic buck circuit of this specific implementation, no external power supply is required, but the controlled photovoltaic component is directly used as the power supply, which greatly reduces the complexity of the system and the production cost of the photovoltaic equipment, and improves the stability of the system. Of course, the photovoltaic buck circuit can also be replaced by a DCDC or LDO chip.

[0105] On the basis of the second specific implementation, the structure of a photovoltaic drive circuit of the first drive module DCM1 is further improved to obtain a third specific implementation, wherein the first drive module DCM1 is the photovoltaic drive circuit, and the remaining structures are the same as those in the above specific implementation, which will not be described in detail here. The schematic diagram of the structure of the photovoltaic drive circuit is shown in FIG. Figure 8 As shown, the photovoltaic drive circuit includes a boost module, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second voltage regulator diode Z2, a first diode D1, a first drive switch tube M5 and a second drive switch tube M6;

[0106] The input end of the boost module is connected to the source of the first on-off switch tube M1, the parallel power supply end of the boost module is grounded, and the output end of the boost module is connected to the first end of the fourth resistor R4;

[0107] The second end of the fourth resistor R4 is respectively connected to the gate of the first on-off switch tube M1, the collector of the first driving switch tube M5 and the cathode of the first diode D1;

[0108] The anode of the first diode D1 is connected to the anode of the second voltage stabilizing diode Z2; the cathode of the second voltage stabilizing diode Z2 is connected to the source of the first on-off switch tube M1;

[0109] The voltage output end of the control chip U1 is connected to the first end of the fifth resistor R5, the second end of the fifth resistor R5 is respectively connected to the collector of the second drive switch tube M6 and the first end of the sixth resistor R6; the second end of the sixth resistor R6 is connected to the base of the first drive switch tube M5, and the emitter of the first drive switch tube M5 is grounded;

[0110] The first signal output terminal of the control chip U1 is connected to the gate of the second driving switch tube M6; the emitter of the second driving switch tube M6 is grounded.

[0111] In this specific implementation, a specific structure in which the first driving module DCM1 is a photovoltaic driving circuit is specifically provided. In the photovoltaic driving circuit of this specific implementation, no external power supply is required, but the controlled photovoltaic component is directly used as the power supply, which greatly reduces the complexity of the system and the production cost of the photovoltaic equipment and improves the stability of the system.

[0112] The Charge pump in the figure is the boost module mentioned above, which can be a capacitor pump or other boost circuit. In a specific implementation, the schematic diagram of the circuit-breaking control voltage signal to be processed and the circuit-breaking control voltage signal is as shown in FIG. Fig.10 As shown in the figure, the g2 control pin of U1 realizes the function of low voltage driving high-position MOS tube M1 through the isolation of M6 and M5, where Z2 and D1 are the driving protection circuit of M5, R4 is the current limiting resistor, and Vgs1 is the Vgs value of MOS tube M1. This circuit can also be an isolation device such as a digital isolator or an isolation optocoupler, but this isolation solution requires the addition of a secondary power supply circuit, which increases complexity and cost.

[0113] Of course, the photovoltaic buck circuit can also be replaced by isolators such as digital isolators and isolation optocouplers.

[0114] The present invention also discloses a photovoltaic device with the above-mentioned beneficial effects, and the photovoltaic device includes a photovoltaic assembly shutdown circuit as described in any one of the above-mentioned embodiments. The photovoltaic assembly shutdown circuit provided by the present invention includes a first on-off switch tube M1, a voltage module VM1, a first drive module DCM1 and a control chip U1; the voltage module VM1 is used to obtain a chip power supply voltage according to the output voltage of the controlled photovoltaic assembly, and to power the control chip U1; the control chip U1 is used to send a pending circuit breaker control voltage signal to the first drive module DCM1 when an arc signal is detected; the first drive module DCM1 is used to obtain a circuit breaker control voltage signal according to the pending circuit breaker control voltage signal, and send the circuit breaker control voltage signal to the first on-off switch tube M1; the first on-off switch tube M1 is connected in series with the controlled photovoltaic assembly, and is used to determine the on-off of the output end of the controlled photovoltaic assembly and the external circuit according to the circuit breaker control voltage signal. The photovoltaic component shutdown circuit provided by the present invention regulates the output voltage of the controlled photovoltaic component through the voltage module VM1 to obtain the chip power supply voltage that can be directly used by the control chip U1, thereby avoiding the shutdown circuit of the photovoltaic device with multiple components connected in series must use a high-voltage chip to cooperate with the high voltage after the multiple components are connected in series, so that general low-voltage chips can also be used for photovoltaic devices with multiple components connected in series. At the same time, since the output voltage signal of the low-voltage chip is also relatively low and is not enough to directly drive the first on-off switch tube M1 connected in series with the controlled photovoltaic component, the present invention further adds the first driving module DCM1, so that the electrical signal emitted by the control chip U1 is isolated and converted to obtain the circuit-breaking control signal that can drive the first on-off switch tube M1, thereby realizing the use of low-voltage chips in high-voltage photovoltaic devices with multiple components connected in series. Compared with the prior art, the difficulty and risk of chip design and production are greatly reduced, and the production cost of the chip is also reduced.

[0115] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0116] It should be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0117] The photovoltaic module shutdown circuit and photovoltaic device provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A photovoltaic module shutdown circuit, characterized in that: It includes a first on-off switch tube, a voltage module, a first driving module and a control chip; The voltage module is used to obtain the chip power supply voltage according to the output voltage of the controlled photovoltaic module to supply power to the control chip; The control chip is used to send a circuit breaker control voltage signal to be processed to the first driving module when an arc signal is detected; The first driving module is used to obtain a circuit breaking control voltage signal according to the circuit breaking control voltage signal to be processed, and send the circuit breaking control voltage signal to the first on-off switch tube; The first on-off switch tube is connected in series with the controlled photovoltaic component, and is used to determine the on-off of the output end of the controlled photovoltaic component and the external circuit according to the circuit-breaking control voltage signal; The positive electrode of the controlled photovoltaic assembly is respectively connected to the first end of the voltage module and the source electrode of the first on-off switch tube; The second end of the voltage module is connected to the input end of the control chip; The first signal output terminal of the control chip is connected to the input terminal of the first driving module; the voltage output terminal of the control chip is connected to the voltage input terminal of the first driving module; the parallel power supply terminal of the control chip is connected to the negative pole of the controlled photovoltaic module; The signal end of the first driving module is connected to the gate of the on-off switch tube, the first collecting end of the first driving module is connected to the source of the on-off switch tube, and the second collecting end of the first driving module is connected to the drain of the on-off switch tube; the parallel power supply end of the first driving module is connected to the negative electrode of the controlled photovoltaic module; When there is a series-connected photovoltaic component connected in series with the controlled photovoltaic component, the photovoltaic component shutdown circuit further includes a second driving module corresponding to the series-connected photovoltaic component, a second bypass switch tube corresponding to the series-connected photovoltaic component, and a second on-off switch tube corresponding to the series-connected photovoltaic component; The drain of the second bypass switch tube is connected to the source of the second on-off switch tube, the source of the second bypass switch tube is connected to the negative electrode of the series-connected photovoltaic assembly, and the gate of the second bypass switch tube is connected to the signal output end of the second driving module; The drain of the second on-off switch tube is connected to the positive electrode of the series-connected photovoltaic assembly, and the gate of the second on-off switch tube is connected to the third signal output terminal of the control chip; The voltage input terminal of the second driving module is connected to the voltage output terminal of the control chip, and the signal input terminal of the second driving module is connected to the fourth signal output terminal of the control chip; The second driving module includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second triode, a third triode and a third voltage stabilizing diode; The first end of the tenth resistor is respectively connected to the voltage output end of the control chip and the emitter of the second transistor; the second end of the tenth resistor is respectively connected to the first end of the seventh resistor and the collector of the third transistor; The base of the third triode is connected to the fourth signal output terminal of the control chip, and the emitter of the third triode is grounded; The second end of the seventh resistor is connected to the base of the second transistor; The collector of the second triode is connected to the first end of the eighth resistor; The second end of the eighth resistor is respectively connected to the gate of the second bypass switch tube, the first end of the ninth resistor and the cathode of the third voltage stabilizing diode; The anode of the third voltage stabilizing diode is connected to the cathode of the series-connected photovoltaic assembly; The second end of the ninth resistor is connected to the negative electrode of the series-connected photovoltaic assembly.

2. The photovoltaic module shutdown circuit according to claim 1, characterized in that: The voltage module is any one of a DCDC chip, an LDO chip or a photovoltaic step-down circuit.

3. The photovoltaic module shutdown circuit according to claim 2, characterized in that: The photovoltaic buck circuit includes a first resistor, a second resistor, a third resistor, a first capacitor, a first transistor, and a first voltage stabilizing diode; The positive electrode of the controlled photovoltaic assembly is respectively connected to the first end of the first resistor and the collector of the first transistor; The second end of the first resistor is respectively connected to the first end of the second resistor, the cathode of the voltage zener diode and the first end of the third resistor; The second end of the third resistor and the positive electrode of the voltage stabilizing diode are grounded; The second end of the second resistor is connected to the base of the first transistor; The emitter of the first transistor is connected to the first end of the first capacitor and the input end of the control chip respectively; The second terminal of the first capacitor is grounded.

4. The photovoltaic module shutdown circuit according to claim 1, characterized in that: The first driving module is any one of a digital isolator, an isolation optocoupler or a photovoltaic driving circuit.

5. The photovoltaic module shutdown circuit according to claim 4, characterized in that: The photovoltaic drive circuit includes a boost module, a fourth resistor, a fifth resistor, a sixth resistor, a second voltage regulator diode, a first diode, a first drive switch tube and a second drive switch tube; The input end of the boost module is connected to the source of the first on-off switch tube, the parallel power supply end of the boost module is grounded, and the output end of the boost module is connected to the first end of the fourth resistor; The second end of the fourth resistor is respectively connected to the gate of the first on-off switch tube, the drain of the first driving switch tube and the cathode of the first diode; The anode of the first diode is connected to the anode of the second voltage stabilizing diode; the cathode of the second voltage stabilizing diode is connected to the source of the first on-off switch tube; The voltage output end of the control chip is connected to the first end of the fifth resistor, the second end of the fifth resistor is respectively connected to the drain of the second drive switch tube and the first end of the sixth resistor; the second end of the sixth resistor is connected to the gate of the first drive switch tube, and the source of the first drive switch tube is grounded; The first signal output terminal of the control chip is connected to the gate of the second driving switch tube; The source of the second driving switch tube is grounded.

6. The photovoltaic module shutdown circuit according to claim 1, characterized in that: The photovoltaic module shutdown circuit also includes a first bypass switch tube; The drain of the first bypass switch tube is connected to the source of the first on-off switch tube, the source of the first bypass switch tube is connected to the negative electrode of the controlled photovoltaic component, and the gate of the first bypass switch tube is connected to the second signal output terminal of the control chip.

7. A photovoltaic device, characterized in that: The photovoltaic device comprises the photovoltaic assembly shutdown circuit according to any one of claims 1 to 6.

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