Single-wire in-out photovoltaic turn-off device, photovoltaic control assembly and photovoltaic equipment

Abstract

The invention discloses a single-line in-out photovoltaic turn-off device, a photovoltaic control assembly and photovoltaic equipment, the single-line in-out photovoltaic turn-off device is connected in series between two photovoltaic assemblies, and the single-line in-out photovoltaic turn-off device comprises an input port and an output port which are respectively connected with the output end of one photovoltaic assembly and the input end of one photovoltaic assembly; the input end of the switching circuit is connected with the input port, and the output end of the switching circuit is connected with the output port; the input end of the turn-off signal acquisition circuit is connected with the input port, and the turn-off signal acquisition circuit is used for acquiring a turn-off trigger signal output by the photovoltaic module and outputting a turn-off signal; the input end of the switch control circuit is connected with the output end of the turn-off signal acquisition circuit, the output end of the switch control circuit is connected with the controlled end of the switch circuit, and the switch control circuit is used for controlling the switch circuit to be turned off according to the turn-off signal. The invention aims to simplify the structure of the single-line incoming and outgoing photovoltaic turn-off device.

Description

Technical Field

[0001] The invention relates to the field of switches, and in particular to a single-line input / output photovoltaic switch, a photovoltaic control component and a photovoltaic device. Background Art

[0002] Photovoltaic power generation technology is widely used as a renewable energy power generation technology. Photovoltaic series outputs direct current, which is converted into alternating current by an inverter and then transmitted to the power grid. The voltage of the series photovoltaic array is relatively high. In order to improve the safety of each series photovoltaic module, the photovoltaic system is required to be able to shut down quickly. At present, a circuit breaker is set between multiple photovoltaic modules, and the power supply of the photovoltaic module is cut off by controlling the circuit breaker.

[0003] The existing circuit breaker includes a sampling circuit, a controller, a switch circuit and an auxiliary power supply, and is provided with a plurality of wiring terminals, which makes the circuit structure and wiring of the circuit breaker more complicated. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a photovoltaic circuit breaker with a single input and output line, a photovoltaic control assembly and a photovoltaic device, so as to simplify the structure of the photovoltaic circuit breaker with a single input and output line.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention provides a single-line photovoltaic circuit breaker, which is connected in series between two photovoltaic modules. The single-line photovoltaic circuit breaker includes:

[0007] An input port for connecting to the output terminal of a photovoltaic module;

[0008] An output port for connecting to an input terminal of a photovoltaic module;

[0009] a switch circuit, wherein an input end of the switch circuit is connected to the input port, and an output end of the switch circuit is connected to the output port;

[0010] A shutdown signal acquisition circuit, wherein the input end of the shutdown signal acquisition circuit is connected to the input port, and the shutdown signal acquisition circuit is used to collect the shutdown trigger signal output by the photovoltaic component and output a shutdown signal;

[0011] A switch control circuit, wherein the input end of the switch control circuit is connected to the output end of the shutdown signal acquisition circuit, the output end of the switch control circuit is connected to the controlled end of the switch circuit, and the switch control circuit is used to control the switch circuit to shut down according to the shutdown signal.

[0012] Optionally, the shutdown signal acquisition circuit is also used to acquire a conduction trigger signal output by the photovoltaic component and output a conduction signal to the switch control circuit, and the switch control circuit is used to control the conduction of the switch circuit according to the conduction signal.

[0013] Optionally, the switch control circuit includes:

[0014] A voltage limiting circuit, wherein the input end of the voltage limiting circuit is connected to the output end of the shutdown signal acquisition circuit, and the voltage limiting circuit is used to output a voltage limiting signal after voltage limiting the shutdown signal;

[0015] A driving circuit, wherein a first input end of the driving circuit is connected to an output end of the shutdown signal acquisition circuit, a second input end of the driving circuit is connected to an output end of the voltage limiting circuit, an output end of the driving circuit is connected to a controlled end of the switch circuit, and the driving circuit is used to drive the switch circuit to shut down according to the voltage limiting signal and the shutdown signal.

[0016] Optionally, the voltage limiting circuit includes a first comparator, a first resistor, a second resistor and a first capacitor, the first end of the first capacitor is connected to the output end of the shutdown signal acquisition circuit, the second end of the first capacitor is connected to the second input end of the first comparator and to the second input end of the driving circuit, the first input end of the first comparator is grounded, the first end of the first resistor and the first end of the second resistor are connected to the output end of the first comparator, and the second end of the first resistor and the second end of the second resistor are grounded.

[0017] Optionally, the driving circuit includes a second comparator, a third resistor, a fourth resistor, a second capacitor and a third capacitor, the second input end of the second comparator is connected to the output end of the voltage limiting circuit, the first input end of the second comparator is connected to the second end of the third resistor and the first end of the second capacitor, the first end of the third resistor is connected to the output end of the shutdown signal acquisition circuit, the second end of the second capacitor is grounded, the output end of the second comparator is connected to the first end of the fourth resistor, the second end of the fourth resistor is connected to the first end of the third capacitor and to the controlled end of the switching circuit, and the second end of the third capacitor is connected to the output end of the switching circuit.

[0018] Optionally, the shutdown signal acquisition circuit includes:

[0019] An oscillator circuit, the input end of which is connected to the input port, and the oscillator circuit is used to output the shutdown signal after performing same-frequency resonance;

[0020] A rectifier circuit, wherein the input end of the rectifier circuit is connected to the output end of the oscillation circuit, the output end of the rectifier circuit is connected to the input end of the switch control circuit, and the rectifier circuit is used to rectify the shutdown signal output by the rectifier circuit and output it to the switch control circuit.

[0021] Optionally, the switch circuit includes a first NMOS tube, a gate of the first NMOS tube is connected to the output end of the switch control circuit, a source of the first NMOS tube is connected to the output port, and a drain of the first NMOS tube is connected to the input port.

[0022] The present invention also proposes a photovoltaic control component, comprising a shutdown signal generator, a plurality of photovoltaic components and a plurality of single-line input and output photovoltaic shut-off devices as described above, wherein the plurality of photovoltaic components are connected in series, and a single-line input and output photovoltaic shut-off device is connected in series between two adjacent photovoltaic components, the shutdown signal generator is connected to the first photovoltaic component among the plurality of photovoltaic components connected in series, and the shutdown signal generator is used to output a shutdown trigger signal or a conduction trigger signal to the first photovoltaic component among the plurality of photovoltaic components connected in series, and the shutdown trigger signal or the conduction trigger signal will be transmitted to the end photovoltaic components in sequence.

[0023] Optionally, the shutdown signal generator includes:

[0024] A signal generating circuit, used for generating a shutdown trigger signal or a conduction trigger signal;

[0025] A signal amplifying circuit, wherein the input end of the signal amplifying circuit is connected to the output end of the signal generating circuit, and the output end of the signal amplifying circuit is connected to the first photovoltaic component among the multiple photovoltaic components connected in series, and the signal amplifying circuit is used to amplify the shutdown trigger signal or the conduction trigger signal and output it to the first photovoltaic component among the multiple photovoltaic components connected in series.

[0026] The present invention also proposes a photovoltaic device, comprising an inverter and the photovoltaic control component as described above, wherein the positive pole of the inverter is connected to the shutdown signal generator in the photovoltaic control component, and the negative pole of the inverter is connected to the end photovoltaic component among multiple photovoltaic components connected in series in the photovoltaic control component.

[0027] The technical solution of the present invention is to form a photovoltaic circuit breaker with a single input and output through an input port, an output port, a switch circuit, a shutdown signal acquisition circuit and a switch control circuit, wherein the input port is used to connect the output end of a photovoltaic module; the output port is used to connect the input end of a photovoltaic module; the input end of the switch circuit is connected to the input port, and the output end of the switch circuit is connected to the output port; the input end of the shutdown signal acquisition circuit is connected to the input port, and the shutdown signal acquisition circuit is used to collect the shutdown trigger signal output by the photovoltaic module and output the shutdown signal; the input end of the switch control circuit is connected to the output end of the shutdown signal acquisition circuit, and the output end of the switch control circuit is connected to the controlled end of the switch circuit, and the switch control circuit is used to control the switch circuit to shut down according to the shutdown signal. In this solution, the photovoltaic circuit breaker with a single input and output is provided with two wiring ports, an input port and an output port, and no other ports need to be provided, which can reduce the number of access cables of the photovoltaic circuit breaker with a single input and output, and reduce the complexity of installation. In addition, the photovoltaic circuit breaker with a single input and output of the present invention can control the switch circuit normally without providing an auxiliary power supply, which reduces the cost of the photovoltaic circuit breaker with a single input and output, and can also simplify the installation requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in 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 personnel in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0029] Figure 1 It is a functional module schematic diagram of an embodiment of a single-line input and output photovoltaic circuit breaker of the present invention.

[0030] Figure 2 The present invention is a schematic diagram of the circuit structure of a switch control circuit in a photovoltaic circuit breaker with a single input and output line according to an embodiment of the present invention.

[0031] Figure 3 It is a circuit structure diagram of an embodiment of a shutdown signal acquisition circuit in a single-line input and output photovoltaic shutdown device of the present invention.

[0032] Figure 4 It is a schematic diagram of functional modules of a photovoltaic assembly according to an embodiment of the present invention.

[0033] Figure 5 The present invention is a schematic diagram of the circuit structure of a signal generating circuit of a shutdown signal generator in a photovoltaic module according to an embodiment of the present invention.

[0034] Figure 6 The present invention is a schematic diagram of the circuit structure of a signal amplifying circuit of a shutdown signal generator in a photovoltaic module according to an embodiment of the present invention.

[0035] Figure 7 The present invention is a schematic diagram of the circuit structure of a signal output circuit of a shutdown signal generator in a photovoltaic module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] In the embodiments and the scope of the patent application, unless the text specifically defines the article, "a", "an", "the" and "the" may also include plural forms. If there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0038] It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when an element is said to be "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can also be intermediate elements. In addition, the "connection" or "coupling" used herein can include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0039] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0040] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] Photovoltaic power generation technology is widely used as a renewable energy power generation technology. Photovoltaic series outputs direct current, which is converted into alternating current by an inverter and then transmitted to the power grid. The voltage of the series photovoltaic array is relatively high. In order to improve the safety of each series photovoltaic module, the photovoltaic system is required to be able to shut down quickly. At present, a circuit breaker is set between multiple photovoltaic modules, and the power supply of the photovoltaic module is cut off by controlling the circuit breaker.

[0042] The existing circuit breaker includes a sampling circuit, a controller, a switch circuit and an auxiliary power supply, and is provided with a plurality of wiring terminals, which makes the circuit structure and wiring of the circuit breaker more complicated.

[0043] In order to solve the above problems, the present invention proposes a single-line photovoltaic circuit breaker 100, which is connected in series between two photovoltaic modules 200. When the single-line photovoltaic circuit breaker 100 is connected in series between the two photovoltaic modules 200, the connection path of the two photovoltaic modules 200 can be turned on or off by controlling the single-line photovoltaic circuit breaker 100, thereby controlling the power supply. The photovoltaic module 200 can be a photovoltaic device such as a photovoltaic panel.

[0044] Reference Figure 1 In one embodiment, the single-line photovoltaic circuit breaker 100 includes:

[0045] Input port 1, used to connect an output end of a photovoltaic module 200;

[0046] Output port 2, used to connect to an input terminal of a photovoltaic module 200;

[0047] A switch circuit 10, wherein an input end of the switch circuit 10 is connected to the input port 1, and an output end of the switch circuit 10 is connected to the output port 2;

[0048] A shutdown signal acquisition circuit 20, wherein the input end of the shutdown signal acquisition circuit 20 is connected to the input port 1, and the shutdown signal acquisition circuit 20 is used to collect a shutdown trigger signal output by the photovoltaic component 200 and output a shutdown signal;

[0049] The switch control circuit 30 has an input end connected to the output end of the shutdown signal acquisition circuit 20, and an output end of the switch control circuit 30 connected to the controlled end of the switch circuit 10. The switch control circuit 30 is used to control the switch circuit 10 to shut down according to the shutdown signal.

[0050] In this embodiment, the input port 1 and the output port 2 of the single-line photovoltaic circuit breaker 100 are respectively connected to the output end of a photovoltaic module 200 and the input end of a photovoltaic module 200, so that the connection between the two photovoltaic modules 200 can be controlled by the switch circuit 10. For example, the switch circuit 10 is composed of switch devices such as triodes or MOS tubes, and the connection between the two photovoltaic modules 200 can be controlled by controlling the conduction or disconnection of the switch devices. Therefore, the single-line photovoltaic circuit breaker 100 of the present scheme is provided with a shutdown signal acquisition circuit 20 and a switch control circuit 30. The shutdown signal acquisition circuit 20 can collect the shutdown trigger signal output by the photovoltaic component 200. The shutdown trigger signal can be generated by additionally setting a shutdown signal generator 300. The shutdown signal generator 300 is connected to the photovoltaic component 200 to generate an AC square wave signal of a fixed frequency, that is, the shutdown trigger signal is output to the photovoltaic component 200, and then output to the single-line photovoltaic circuit breaker 100. The shutdown signal acquisition circuit 20 in the single-line photovoltaic circuit breaker 100 can be provided with a rectifier circuit 22 to collect the AC square wave signal, and then obtain a DC power supply to the switch control circuit 30 after rectification and filtering, thereby controlling the conduction or shutdown of the switch device in the switch circuit 10. For example, when the power supply cannot supply power to the shutdown signal generator 300 normally, the shutdown signal generator 300 cannot generate an AC square wave signal with a fixed frequency, which is regarded as outputting a shutdown trigger signal to the photovoltaic component 200 and the photovoltaic shutdown device 100 with a single input and output, and the shutdown signal acquisition circuit 20 in the photovoltaic shutdown device 100 with a single input and output outputs a low-level electrical signal to the switch control circuit 30, and the switch control circuit 30 controls the switch device in the switch circuit 10 to be disconnected, thereby disconnecting the connection path between the two photovoltaic components 200; it can also be that when the power supply is normally supplied to the shutdown signal generator 300, the shutdown signal generator 300 generates an AC square wave signal with a fixed frequency, that is, a conduction trigger signal is output to the photovoltaic component 200 and the photovoltaic shutdown device 100 with a single input and output, and the shutdown signal acquisition circuit 20 in the photovoltaic shutdown device 100 with a single input and output outputs a high-level electrical signal to the switch control circuit 30, and the switch control circuit 30 controls the switch device in the switch circuit 10 to be turned on, thereby conducting the connection path between the two photovoltaic components 200. The current or voltage that controls the switch device in the switch circuit 10 to be turned on or off is related to the type of the switch device and can be set according to actual conditions and user needs.

[0051] The technical solution of the present invention constitutes a single-line input and output photovoltaic shut-off device 100 through an input port 1, an output port 2, a switch circuit 10, a shutdown signal acquisition circuit 20 and a switch control circuit 30, wherein the input port 1 is used to connect the output end of a photovoltaic module 200; the output port 2 is used to connect the input end of a photovoltaic module 200; the input end of the switch circuit 10 is connected to the input port 1, and the output end of the switch circuit 10 is connected to the output port 2; the input end of the shutdown signal acquisition circuit 20 is connected to the input port 1, and the shutdown signal acquisition circuit 20 is used to collect the shutdown trigger signal output by the photovoltaic module 200 and output the shutdown signal; the input end of the switch control circuit 30 is connected to the output end of the shutdown signal acquisition circuit 20, and the output end of the switch control circuit 30 is connected to the controlled end of the switch circuit 10, and the switch control circuit 30 is used to control the switch circuit 10 to shut down according to the shutdown signal. In this solution, the photovoltaic circuit breaker 100 with a single input and output is provided with two connection ports, the input port 1 and the output port 2, and no other ports are required, which can reduce the number of access cables of the photovoltaic circuit breaker 100 with a single input and output, and reduce the complexity of installation. In addition, the photovoltaic circuit breaker 100 with a single input and output of the present invention can control the switch circuit 10 normally without an auxiliary power supply, which reduces the cost of the photovoltaic circuit breaker 100 with a single input and output, and can also simplify the installation requirements.

[0052] It can be understood that, in one embodiment, the shutdown signal acquisition circuit 20 is also used to collect the conduction trigger signal output by the photovoltaic component 200, and output the conduction signal to the switch control circuit 30, and the switch control circuit 30 is used to control the conduction of the switch circuit 10 according to the conduction signal.

[0053] In this embodiment, when the power supply is normally supplied to the shutdown signal generator 300, the shutdown signal generator 300 can generate an AC square wave signal of a fixed frequency, that is, a conduction trigger signal is output to the photovoltaic component 200 and the single-line photovoltaic shut-off device 100, and the shutdown signal acquisition circuit 20 in the single-line photovoltaic shut-off device 100 outputs a high-level electrical signal to the switch control circuit 30, and the switch control circuit 30 controls the switch device in the switch circuit 10 to turn on, thereby turning on the connection path between the two photovoltaic components 200.

[0054] Reference Figure 2 In one embodiment, the switch control circuit 30 includes:

[0055] A voltage limiting circuit 31, wherein the input end of the voltage limiting circuit 31 is connected to the output end of the shutdown signal acquisition circuit 20, and the voltage limiting circuit 31 is used to limit the voltage of the shutdown signal and then output a voltage limiting signal;

[0056] A driving circuit 32, wherein a first input end of the driving circuit 32 is connected to an output end of the shutdown signal acquisition circuit 20, a second input end of the driving circuit 32 is connected to an output end of the voltage limiting circuit 31, and an output end of the driving circuit 32 is connected to a controlled end of the switch circuit 10, and the driving circuit 32 is used to drive the switch circuit 10 to shut down according to the voltage limiting signal and the shutdown signal.

[0057] In this embodiment, the switch control circuit 30 can be composed of a voltage limiting circuit 31 and a driving circuit 32. The voltage limiting circuit 31 can be composed of electronic components such as a comparator, a capacitor, and a resistor. The comparator in the voltage limiting circuit 31 can limit the voltage of the shutdown signal output by the shutdown signal acquisition circuit 20, and can also limit the voltage of the conduction signal output by the shutdown signal acquisition circuit 20, and then output the shutdown signal or conduction signal after voltage limiting, that is, the voltage limiting signal to the driving circuit 32. The driving circuit 32 can also be composed of electronic components such as a comparator, a capacitor, and a resistor. The driving circuit 32 can control the voltage output to the switch device in the switch circuit 10 to ensure that the output voltage can reach the turn-on voltage of the switch device. For example, if the switch device in the switch circuit 10 is an NMOS tube, the voltage output to the switch device can be controlled within the range of 10-15V. In this way, the switch control circuit 30 can complete the control of the switch circuit 10.

[0058] Further, refer to Figure 2 In an exemplary technology, the voltage limiting circuit 31 includes a first comparator U1, a first resistor R1, a second resistor R2 and a first capacitor C1. The first end of the first capacitor C1 is connected to the output end of the shutdown signal acquisition circuit 20, the second end of the first capacitor C1 is connected to the second input end of the first comparator U1, and is connected to the second input end of the drive circuit 32. The first input end of the first comparator U1 is grounded, the first end of the first resistor R1 and the first end of the second resistor R2 are connected to the output end of the first comparator U1, and the second end of the first resistor R1 and the second end of the second resistor R2 are grounded. By setting the first comparator U1, it is possible to prevent the input voltage of the signal acquisition circuit from being too high, thereby damaging the electronic components in the subsequent circuit. The first resistor R1 and the second resistor R2 can be used for voltage division, thereby adjusting the output level of the comparator or increasing the stability of the output. The first capacitor C1 can be used for filtering and smoothing the input voltage of the shutdown signal acquisition circuit 20. It should be noted that Figure 2 The number and parameters of the resistors and capacitors of the medium voltage limiting circuit 31 can be adjusted according to actual conditions and user requirements, and this solution does not impose any restrictions.

[0059] Further, refer to Figure 2In an exemplary technology, the driving circuit 32 includes a second comparator U2, a third resistor R3, a fourth resistor R4, a second capacitor C2 and a third capacitor C3, the second input end of the second comparator U2 is connected to the output end of the voltage limiting circuit 31, the first input end of the second comparator U2 is connected to the second end of the third resistor R3 and the first end of the second capacitor C2, the first end of the third resistor R3 is connected to the output end of the shutdown signal acquisition circuit 20, the second end of the second capacitor C2 is grounded, the output end of the second comparator U2 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to the first end of the third capacitor C3, and is connected to the controlled end of the switch circuit 10, and the second end of the third capacitor C3 is connected to the output end of the switch circuit 10. Among them, by setting the second comparator U2, the voltage output to the switch circuit 10 can be controlled within a preset voltage range. For example, if the switch device in the switch circuit 10 is an NMOS tube, the voltage output to the switch device can be controlled within the range of 10-15V by the second comparator U2; the third resistor R3 and the second capacitor C2 connected to the input end of the second comparator U2 can suppress external interference signals to a certain extent, enhance the comparator's resistance to power supply noise and other high-frequency interference, and smooth input voltage fluctuations. The fourth resistor R4 and the third capacitor C3 connected to the output end of the second comparator U2 can suppress the oscillation and jitter that may be generated by the comparator during the switching process, provide a more stable output, and help improve the reliability of the system; and the rise and fall times of the output signal can be designed to be smoother, reduce the impact on subsequent circuits, and reduce problems caused by transients. It should be noted that Figure 2 The number and parameters of the resistors and capacitors in the driving circuit 32 can be adjusted according to actual conditions and user needs, and this solution does not impose any restrictions.

[0060] Reference Figure 3 In one embodiment, the shutdown signal acquisition circuit 20 includes:

[0061] An oscillator circuit 21, wherein the input end of the oscillator circuit 21 is connected to the input port 1, and the oscillator circuit 21 is used to output the shutdown signal after performing the same frequency resonance;

[0062] The rectifier circuit 22 has an input end connected to the output end of the oscillation circuit 2121, and an output end of the rectifier circuit 22 is connected to an input end of the switch control circuit 30. The rectifier circuit 22 is used to rectify the shutdown signal output by the rectifier circuit 22 and output it to the switch control circuit 30.

[0063] In this embodiment, the oscillation circuit 21 can be composed of an inductor and a capacitor to form an LC oscillation circuit 21, so that the shutdown signal generator 300 generates an AC square wave signal of a fixed frequency, which then resonates with the LC oscillation circuit 21 at the same frequency. The same frequency signal is strengthened and then rectified by the rectifier circuit 22 to obtain a DC power for the switch control circuit 30 to operate; the rectifier circuit 22 can be composed of a diode, or a rectifier bridge; and when the switching device of the switch circuit 10 is a MOS tube, the different frequency signals are filtered out and the MOS tube will not be triggered by mistake.

[0064] Reference Figure 2 In one embodiment, the switch circuit 10 includes a first NMOS transistor Q1, a gate of the first NMOS transistor Q1 is connected to the output end of the switch control circuit 30, a source of the first NMOS transistor Q1 is connected to the output port 2, and a drain of the first NMOS transistor Q1 is connected to the input port 1.

[0065] In this embodiment, the switching device in the switching circuit 10 can be an NMOS tube, and the connection control of the two photovoltaic components 200 is performed through the first NMOS tube Q1. It can have high input impedance and low on-resistance, and the MOS tube also has the advantages of fast switching speed, high voltage resistance, low power consumption and strong anti-interference ability.

[0066] In one embodiment, the single-line photovoltaic circuit breaker 100 further includes:

[0067] An on-off indication circuit, wherein the input end of the on-off indication circuit is connected to the input port 1, the output end of the on-off indication circuit is connected to the input end of the shutdown signal acquisition circuit 20, and the on-off indication circuit is also used to operate according to the shutdown trigger signal or the on trigger signal output by the photovoltaic component 200.

[0068] In this embodiment, the on-off indication circuit can be composed of a light-emitting diode and a resistor. When the photovoltaic module 200 outputs a shutdown trigger signal, the light-emitting diode lights up, and when the photovoltaic module 200 outputs a conduction trigger signal, the light-emitting diode goes out; in this way, the user can be reminded of the conduction and shutdown conditions. The specific circuit structure can refer to Figure 3 .

[0069] The invention also provides a photovoltaic control component.

[0070] Reference Figure 4In one embodiment, the photovoltaic control component includes a shutdown signal generator 300, a plurality of photovoltaic components 200 and a plurality of single-line photovoltaic shut-off devices 100 as described above, the plurality of photovoltaic components 200 are connected in series, and a single-line photovoltaic shut-off device 100 is connected in series between two adjacent photovoltaic components 200. The shutdown signal generator 300 is connected to the first photovoltaic component 200 of the plurality of photovoltaic components 200 connected in series, and the shutdown signal generator 300 is used to output a shutdown trigger signal or a conduction trigger signal to the first photovoltaic component 200 of the plurality of photovoltaic components 200 connected in series, and transmit the shutdown trigger signal or the conduction trigger signal to the end photovoltaic components 200 in sequence.

[0071] In this embodiment, the shutdown signal generator 300 is connected in series with multiple photovoltaic modules 200 and multiple single-line photovoltaic shut-off devices 100. The specific connection conditions can be referred to in Figure 4 It is understandable that, since the above-mentioned single-line photovoltaic circuit breaker 100 is used in the photovoltaic control assembly of the present invention, the embodiments of the photovoltaic control assembly of the present invention include all technical solutions of all embodiments of the above-mentioned single-line photovoltaic circuit breaker 100, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0072] Reference Figures 5 to 7 In one embodiment, the shutdown signal generator 300 includes:

[0073] A signal generating circuit 201, used to generate a shutdown trigger signal or a conduction trigger signal;

[0074] A signal amplifying circuit 202, wherein the input end of the signal amplifying circuit 202 is connected to the output end of the signal generating circuit 201, and the output end of the signal amplifying circuit 202 is connected to the first photovoltaic component 200 among the multiple photovoltaic components 200 connected in series, and the signal amplifying circuit 202 is used to amplify the shutdown trigger signal or the conduction trigger signal and output it to the first photovoltaic component 200 among the multiple photovoltaic components 200 connected in series.

[0075] In this embodiment, the signal generating circuit 201 can generate a turn-off trigger signal or a turn-on trigger signal. The specific circuit structure of the signal generating circuit 201 can refer to Figure 5 The signal amplifier circuit 202 can amplify the off trigger signal or the on trigger signal and output it to the first photovoltaic module 200 in the plurality of photovoltaic modules 200 connected in series. The specific circuit structure of the signal amplifier circuit 202 can refer to Figure 6Further, the shutdown signal generator 300 may further include a signal output circuit 203 for outputting the shutdown trigger signal or the conduction trigger signal to the photovoltaic module 200. The specific circuit structure of the signal output circuit 203 may refer to Figure 7 to set it up.

[0076] The present invention also provides a photovoltaic device.

[0077] In one embodiment, the photovoltaic device includes an inverter and the photovoltaic control assembly as described above, the positive pole of the inverter is connected to the shutdown signal generator 300 in the photovoltaic control assembly, and the negative pole of the inverter is connected to the photovoltaic assembly 200 at the end of a plurality of photovoltaic assemblies 200 connected in series in the photovoltaic control assembly. It can be understood that since the photovoltaic control assembly is used in the photovoltaic device of the present invention, the embodiments of the photovoltaic device of the present invention include all technical solutions of all embodiments of the photovoltaic control assembly, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0078] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A single-line photovoltaic circuit breaker, characterized in that: The single-line photovoltaic circuit breaker is connected in series between two photovoltaic modules, and the single-line photovoltaic circuit breaker includes: An input port for connecting to the output terminal of a photovoltaic module; An output port, used to connect to the input terminal of another PV module; a switch circuit, wherein an input end of the switch circuit is connected to the input port, and an output end of the switch circuit is connected to the output port; A shutdown signal acquisition circuit, wherein the input end of the shutdown signal acquisition circuit is connected to the input port, and the shutdown signal acquisition circuit is used to collect the shutdown trigger signal output by the photovoltaic component and output a shutdown signal; A switch control circuit, wherein the input end of the switch control circuit is connected to the output end of the shutdown signal acquisition circuit, the output end of the switch control circuit is connected to the controlled end of the switch circuit, and the switch control circuit is used to control the switch circuit to shut down according to the shutdown signal.

2. The single-line photovoltaic circuit breaker according to claim 1, characterized in that: The shutdown signal acquisition circuit is also used to acquire the conduction trigger signal output by the photovoltaic component and output a conduction signal to the switch control circuit. The switch control circuit is used to control the conduction of the switch circuit according to the conduction signal.

3. The single-line photovoltaic circuit breaker according to claim 1, characterized in that: The switch control circuit comprises: A voltage limiting circuit, wherein the input end of the voltage limiting circuit is connected to the output end of the shutdown signal acquisition circuit, and the voltage limiting circuit is used to output a voltage limiting signal after voltage limiting the shutdown signal; A driving circuit, wherein a first input end of the driving circuit is connected to an output end of the shutdown signal acquisition circuit, a second input end of the driving circuit is connected to an output end of the voltage limiting circuit, an output end of the driving circuit is connected to a controlled end of the switch circuit, and the driving circuit is used to drive the switch circuit to shut down according to the voltage limiting signal and the shutdown signal.

4. The single-line photovoltaic circuit breaker according to claim 3, characterized in that: The voltage limiting circuit includes a first comparator, a first resistor, a second resistor and a first capacitor, wherein the first end of the first capacitor is connected to the output end of the shutdown signal acquisition circuit, the second end of the first capacitor is connected to the second input end of the first comparator and to the second input end of the drive circuit, the first input end of the first comparator is grounded, the first end of the first resistor and the first end of the second resistor are connected to the output end of the first comparator, and the second end of the first resistor and the second end of the second resistor are grounded.

5. The single-line photovoltaic circuit breaker according to claim 3, characterized in that: The driving circuit includes a second comparator, a third resistor, a fourth resistor, a second capacitor and a third capacitor, the second input end of the second comparator is connected to the output end of the voltage limiting circuit, the first input end of the second comparator is connected to the second end of the third resistor and the first end of the second capacitor, the first end of the third resistor is connected to the output end of the shutdown signal acquisition circuit, the second end of the second capacitor is grounded, the output end of the second comparator is connected to the first end of the fourth resistor, the second end of the fourth resistor is connected to the first end of the third capacitor and to the controlled end of the switch circuit, and the second end of the third capacitor is connected to the output end of the switch circuit.

6. The single-line photovoltaic circuit breaker according to claim 1, characterized in that: The shutdown signal acquisition circuit comprises: An oscillator circuit, the input end of which is connected to the input port, and the oscillator circuit is used to output the shutdown signal after performing same-frequency resonance; A rectifier circuit, wherein the input end of the rectifier circuit is connected to the output end of the oscillation circuit, the output end of the rectifier circuit is connected to the input end of the switch control circuit, and the rectifier circuit is used to rectify the shutdown signal output by the rectifier circuit and output it to the switch control circuit.

7. The single-line photovoltaic circuit breaker according to claim 1, characterized in that: The switch circuit includes a first NMOS transistor, a gate of the first NMOS transistor is connected to the output end of the switch control circuit, a source of the first NMOS transistor is connected to the output port, and a drain of the first NMOS transistor is connected to the input port.

8. A photovoltaic control assembly, characterized in that: It comprises a shutdown signal generator, a plurality of photovoltaic modules and a plurality of single-line input and output photovoltaic circuit breakers as described in any one of claims 1 to 7, wherein the plurality of photovoltaic modules are connected in series, and a single-line input and output photovoltaic circuit breaker is connected in series between two adjacent photovoltaic modules, the shutdown signal generator is connected to the first photovoltaic module among the plurality of photovoltaic modules connected in series, and the shutdown signal generator is used to output a shutdown trigger signal or a conduction trigger signal to the first photovoltaic module among the plurality of photovoltaic modules connected in series, and transmit the shutdown trigger signal or the conduction trigger signal to the end photovoltaic modules in sequence.

9. The photovoltaic control assembly according to claim 8, characterized in that: The shutdown signal generator comprises: A signal generating circuit, used for generating a shutdown trigger signal or a conduction trigger signal; A signal amplifying circuit, wherein the input end of the signal amplifying circuit is connected to the output end of the signal generating circuit, and the output end of the signal amplifying circuit is connected to the first photovoltaic component among the multiple photovoltaic components connected in series, and the signal amplifying circuit is used to amplify the shutdown trigger signal or the conduction trigger signal and output it to the first photovoltaic component among the multiple photovoltaic components connected in series.

10. A photovoltaic device, characterized in that: It comprises an inverter and a photovoltaic control component as described in any one of claims 8 to 9, wherein the positive pole of the inverter is connected to a shutdown signal generator in the photovoltaic control component, and the negative pole of the inverter is connected to the last photovoltaic component among a plurality of photovoltaic components connected in series in the photovoltaic control component.

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