CN218041199U - Short-circuit fault protection circuit and photovoltaic inverter circuit - Google Patents
Short-circuit fault protection circuit and photovoltaic inverter circuit Download PDFInfo
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- CN218041199U CN218041199U CN202222346167.6U CN202222346167U CN218041199U CN 218041199 U CN218041199 U CN 218041199U CN 202222346167 U CN202222346167 U CN 202222346167U CN 218041199 U CN218041199 U CN 218041199U
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Abstract
The application relates to the field of electronic circuits, and discloses a short-circuit fault protection circuit and a photovoltaic inverter circuit, including: the device comprises a controller, at least 1 impedance adjusting circuit and at least 1 voltage detecting circuit; the voltage detection circuit is connected with the line to be detected to collect voltage detection signals. The controller judges whether the voltage detection signal is lower than a voltage threshold value or not so as to determine whether the line to be detected is short-circuited or not. The controller controls the resistance of the impedance adjusting circuit to increase when the voltage detection signal is below the voltage threshold. The first end of the impedance adjusting circuit is connected with a direct current power supply of the line to be detected, and the second end of the impedance adjusting circuit is connected with each power supply line of the power supply capacitor. Therefore, the impedance of the impedance adjusting circuit is controlled to be increased when the circuit to be detected is short-circuited, so that the electric energy in the circuit to be detected can be released on the impedance, the circuit device is prevented from being burnt due to short circuit, the circuit is ensured to be conducted, and the stability of the inverter circuit is improved.
Description
Technical Field
The present application relates to the field of electronic circuits, and in particular, to a short-circuit fault protection circuit and a photovoltaic inverter circuit.
Background
The photovoltaic inverter needs the external world to provide energy when accomplishing contravariant working process, mainly through the electric capacity energy supply of connecting on the generating line at present, and the generating line provides direct current signal of telecommunication for the electric capacity both ends. As the power of the photovoltaic inverter is larger, the capacitance value of the capacitor is also larger.
Fig. 1 is a schematic diagram of a conventional bus power supply circuit for an inverter, which collects current from a photovoltaic panel side through a plurality of power supply circuits and transmits the current to a bus to charge a power supply capacitor of the inverter, as shown in fig. 1. When the bus is short-circuited, the energy stored in the capacitor can be quickly released to a circuit in the form of current, and meanwhile, as the photovoltaic panel continuously supplies power to the inverter, the temperature of related devices is finally increased, even open fire occurs, and huge loss is caused.
Therefore, it is an urgent need to solve the problem of providing a short-circuit fault protection circuit to prevent the circuit device from being burned out due to the short circuit of the bus.
Disclosure of Invention
The application aims to provide a short-circuit fault protection circuit and a photovoltaic inverter circuit so as to prevent circuit devices from being burnt out due to short circuit of a bus.
In order to solve the above technical problem, the present application provides a short-circuit fault protection circuit, including:
the circuit comprises a controller 1, an impedance adjusting circuit 2 and a voltage detection circuit 3, wherein the number of the impedance adjusting circuits 2 is at least 1;
the voltage detection circuit 3 is connected with a line to be detected so as to collect a voltage detection signal;
the first end of the impedance adjusting circuit 2 is connected with a direct current power supply of the line to be detected, and the second end of the impedance adjusting circuit 2 is connected with each power supply circuit of the power supply capacitor;
the controller 1 is connected with the voltage detection circuit 3 to obtain the voltage detection signal and judge whether the voltage detection signal is lower than a voltage threshold value;
the controller 1 is further connected to the impedance adjusting circuit 2, and controls the resistance of the impedance adjusting circuit 2 to increase when the voltage detection signal is lower than the voltage threshold.
Preferably, the device also comprises a direct current power supply circuit;
the direct current power supply circuit comprises a first resistive device and a first diode;
the first end of the first resistive device is connected to the dc power supply, the second end of the first resistive device is connected to the anode of the diode, and the cathode of the diode is connected to the controller 1.
Preferably, the system also comprises a three-phase rectifier bridge circuit;
the first end of the three-phase rectifier bridge circuit is connected with the controller 1, and the second end of the three-phase rectifier bridge circuit is connected with an alternating current power grid.
Preferably, the method further comprises the following steps: an AC/DC hybrid power supply circuit;
the alternating current-direct current hybrid power supply circuit comprises: the first resistive device, the diode and the three-phase rectifier bridge circuit;
the first end of the three-phase rectifier bridge circuit is connected with the controller 1, and the second end of the three-phase rectifier bridge circuit is connected with an alternating current power grid;
the first end of the first resistive device is connected to the dc power supply, the second end of the first resistive device is connected to the anode of the diode, and the cathode of the diode is connected to the controller 1.
Preferably, the impedance adjusting circuit 2 includes at least a first path and a second path;
the first path comprises a first switch and a second resistive device, the second path comprises a second switch and a third resistive device, and the resistance of the third resistive device is far greater than that of the second resistive device;
the control end of the first switch and the control end of the second switch are both connected to the controller, the first end of the first switch and the second end of the second switch are both connected to the dc power supply, the second end of the second resistive device is connected to the second end of the third resistive device, and a connection point between the first end of the first switch and the second end of the second switch is used as the second end of the impedance adjusting circuit 2;
a first terminal of the second resistive device is connected to the second terminal of the first switch, and a first terminal of the third resistive device is connected to the second terminal of the second switch.
Preferably, the short-circuit fault protection circuit further includes: a resetting device;
the reset device is connected with the impedance adjusting circuit 2 and is used for controlling the impedance adjusting circuit to enter a high-impedance state when the short-circuit fault protection circuit is powered off.
Preferably, the first switch and the second switch are both relays.
Preferably, the short-circuit fault protection circuit further includes: an alarm device;
the alarm device is connected with the controller 1 and used for sending alarm information to a manager under the control of the controller 1 when the voltage detection signal is lower than the voltage threshold value.
Preferably, the alarm device comprises a buzzer and an indicator light.
In order to solve the technical problem, the application further provides a photovoltaic inverter circuit, which comprises the short-circuit fault protection circuit.
The application provides a short-circuit fault protection circuit, includes: the device comprises a controller, at least 1 impedance adjusting circuit and at least 1 voltage detecting circuit; the voltage detection circuit is connected with the line to be detected to collect voltage detection signals and provide data support for judging whether the line to be detected is short-circuited. The controller is connected with the voltage detection circuit to obtain a voltage detection signal and judge whether the voltage detection signal is lower than a voltage threshold value or not, so that whether the line to be detected is short-circuited or not is determined. The controller is also connected with the impedance adjusting circuit and controls the resistance of the impedance adjusting circuit to increase when the voltage detection signal is lower than the voltage threshold value. The first end of the impedance adjusting circuit is connected with a direct current power supply of the circuit to be detected, and the second end of the impedance adjusting circuit is connected with each power supply circuit of the power supply capacitor, so that the impedance of each power supply circuit of the circuit to be detected is adjusted according to the control instruction. Therefore, when the short circuit of the circuit to be detected is detected, the controller controls the impedance of the impedance adjusting circuit to be increased, so that the impedance connected with the circuit to be detected is increased, the electric energy in the circuit to be detected can be released on the impedance, the circuit device is prevented from being burnt due to the short circuit, the circuit is ensured to be conducted, other devices in the circuit work, and the stability of the inverter circuit is improved.
In addition, the application also provides a short-circuit fault protection circuit and a photovoltaic inverter circuit, which are applied to the short-circuit fault protection circuit, and the effect is the same as the above.
Drawings
In order to more clearly illustrate the embodiments of the present application, the drawings required for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained by those skilled in the art without inventive effort.
FIG. 1 is a schematic diagram of a conventional inverter bus power supply circuit;
fig. 2 is a structural diagram of a short-circuit fault protection circuit according to an embodiment of the present disclosure;
fig. 3 is a structural diagram of a dc-powered short-circuit fault protection circuit according to an embodiment of the present application;
fig. 4 is a structural diagram of an ac-powered short-circuit fault protection circuit according to an embodiment of the present application;
fig. 5 is a structural diagram of a short-circuit fault protection circuit for hybrid ac/dc power supply according to an embodiment of the present application;
fig. 6 is a flowchart of a short-circuit fault protection circuit control method according to an embodiment of the present disclosure;
fig. 7 is a structural diagram of a short-circuit fault protection circuit control device according to an embodiment of the present application;
fig. 8 is a structural diagram of another short-circuit fault protection circuit control device according to an embodiment of the present application;
the reference numbers are as follows: the controller is 1, the impedance adjusting circuit is 2, and the voltage detecting circuit is 3.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present application.
The core of the application is to provide a short-circuit fault protection circuit and a photovoltaic inverter circuit.
In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings.
Fig. 2 is a structural diagram of a short-circuit fault protection circuit according to an embodiment of the present application, and as shown in fig. 2, the short-circuit fault protection circuit includes:
the device comprises a controller 1, an impedance adjusting circuit 2 and a voltage detection circuit 3, wherein the number of the impedance adjusting circuits 2 is at least 1;
the voltage detection circuit 3 is connected with a line to be detected so as to collect a voltage detection signal;
the first end of the impedance adjusting circuit 2 is connected with a direct current power supply of a line to be detected, and the second end of the impedance adjusting circuit 2 is connected with each power supply line of the power supply capacitor;
the controller 1 is connected with the voltage detection circuit to obtain a voltage detection signal and judge whether the voltage detection signal is lower than a voltage threshold value;
the controller 1 is also connected to the impedance adjusting circuit 2, and controls the resistance of the impedance adjusting circuit 2 to increase when the voltage detection signal is lower than the voltage threshold.
In specific implementation, for single Maximum Power Point Tracking (MPPT), the MPPT is connected to the photovoltaic panel through multiple sets of Power supply lines, so as to obtain the energy of the inverter. When can understand, controller 1 can be equipment such as singlechip, PLC.
When the controller 1 detects that the bus is short-circuited, the controller 1 sends an adjustment instruction to each impedance adjusting circuit 2 to increase the impedance value of each impedance adjusting circuit 2. As shown in fig. 2, the controller 1 controls the switching devices S _ R1 to S _ Rn to be closed, the switching devices S1 to Sn are disconnected, the current on the photovoltaic panel side is connected to the BUS through the switching devices S _ R1 to S _ Rn, and the voltage across the equivalent resistance resistors R1 to Rn of the impedance adjusting circuits 2 greatly limits the continuous short-circuit current on the BUS because the BUS is in a short-circuit state, so that the occurrence of open fire due to continuous heating caused by BUS short circuit is avoided. The switchgear used in this embodiment may be a highly reliable switchgear such as a relay, a breaker, and a semiconductor.
The application provides a short-circuit fault protection circuit, this circuit includes: the device comprises a controller, at least 1 impedance adjusting circuit and at least 1 voltage detecting circuit; the voltage detection circuit is connected with the line to be detected to collect voltage detection signals and provide data support for judging whether the line to be detected is short-circuited. The controller is connected with the voltage detection circuit to obtain a voltage detection signal and judge whether the voltage detection signal is lower than a voltage threshold value, so that whether the line to be detected is short-circuited or not is determined. The controller is also connected with the impedance adjusting circuit and controls the resistance of the impedance adjusting circuit to increase when the voltage detection signal is lower than the voltage threshold value. The first end of the impedance adjusting circuit is connected with a direct current power supply of the line to be detected, and the second end of the impedance adjusting circuit is connected with each power supply circuit of the power supply capacitor, so that the impedance of each power supply circuit of the line to be detected is adjusted according to the control instruction. Therefore, when the short circuit of the circuit to be detected is detected, the controller controls the impedance of the impedance adjusting circuit to be increased, so that the impedance connected with the circuit to be detected is increased, the electric energy in the circuit to be detected can be released on the impedance, the circuit device is prevented from being burnt due to the short circuit, the circuit is ensured to be conducted, other devices in the circuit work, and the stability of the inverter circuit is improved.
In a specific implementation, the controller 1 is connected in parallel with a power supply capacitor of the inverter circuit, and when a bus of the inverter circuit has a short-circuit fault, the controller 1 is also short-circuited, so that the impedance of the impedance adjusting circuit 2 cannot be adjusted normally. Therefore, an additional power supply circuit needs to be provided for the controller 1. In a specific implementation, the power supply circuit may be a dc power supply circuit, and may also be a three-phase rectifier bridge circuit, or an ac-dc hybrid power supply circuit, which is not limited herein.
Fig. 3 is a structural diagram of a short-circuit fault protection circuit for dc power supply according to an embodiment of the present application, and as shown in fig. 3, on the basis of the foregoing embodiment, when the power supply circuit is a dc power supply circuit, the dc power supply circuit includes a first resistive device R1 and a diode D1;
a first end of the first resistive device R1 is connected to the dc power supply, a second end of the first resistive device R1 is connected to an anode of the diode D1, and a cathode of the diode D1 is connected to the controller 1.
As shown in fig. 3, the short-circuit fault protection circuit provided in this embodiment is applied to the dc bus terminal of the photovoltaic inverter, and therefore, in order to reduce the circuit cost, the dc power supply of the dc power supply circuit may be a photovoltaic panel.
It can be understood that the voltage across the supply capacitor in the inverter circuit is the sum of the input voltages of the plurality of supply lines, and when the bus operates normally, the voltage at the controller 1 is higher than the voltage at the dc power supply side (typically, the supply voltage to the photovoltaic panel), and at this time, the diode D1 is in an off state. When the bus is short-circuited, the voltage at the terminal of the controller 1 is lower than the voltage at the DC power supply side, and the power supply circuit is conducted to provide electric energy for the controller 1.
Fig. 4 is a structural diagram of an ac-powered short-circuit fault protection circuit according to an embodiment of the present disclosure, and as shown in fig. 4, on the basis of the foregoing embodiment, when a power supply circuit is a three-phase rectifier bridge circuit;
the first end of the three-phase rectifier bridge circuit is connected with the controller 1, and the second end of the three-phase rectifier bridge circuit is connected with an alternating current power grid.
Fig. 5 is a structural diagram of a short-circuit fault protection circuit for hybrid ac/dc power supply according to an embodiment of the present application, and as shown in fig. 5, the hybrid ac/dc power supply circuit includes: the circuit comprises a first resistive device R1, a diode D1 and a three-phase rectifier bridge circuit;
the first end of the three-phase rectifier bridge circuit is connected with the controller 1, and the second end of the three-phase rectifier bridge circuit is connected with an alternating current power grid;
the first end of the first resistive device R1 is connected with the direct current power supply, the second end of the first resistive device R1 is connected with the anode of the diode D1, and the cathode of the diode D1 is connected with the controller 1.
In this embodiment, an additional ac power supply circuit or a dc power supply circuit or an ac/dc power supply circuit is used to supply power to the controller after the controller is short-circuited, so that the controller can normally adjust the resistance value of the impedance adjusting circuit.
In specific implementation, the impedance adjusting circuit 2 may be a resistive device unit composed of a plurality of resistors, the resistance value in the access line may be changed by adjusting the impedance value of the resistive device unit, or a plurality of parallel lines may be provided, each line is not turned on at the same time, and the resistance value in the access line is adjusted by controlling the turned-on line.
In the present embodiment, the latter scheme is selected, and the impedance adjusting circuit 2 at least includes a first path and a second path;
the first path includes a first switch and a second resistive device R2, the second path includes a second switch and a third resistive device R3, and the resistance of the third resistive device R3 is much greater than the resistance of the second resistive device R2.
The third resistive device R3 is a large-resistance and high-power circuit, so as to ensure that the power loss of the resistor in the main power circuit can meet the derating of the rated power of the resistor when a BUS short circuit occurs or under some other abnormal conditions.
It can be understood that, since the inverter current has a plurality of power supply lines, and each power supply circuit is connected to the photovoltaic panel, the impedance of each power supply line needs to be adjusted. One impedance adjusting circuit 2 may be provided for each power supply line, or one impedance adjusting circuit 2 may be shared by a plurality of power supply lines. The resistive device used in the former scheme has smaller resistance value and lower cost. Simultaneously, set up a plurality of impedance adjusting circuit 2 and can also prevent because single power supply line trouble leads to inverter circuit whole damage, the reliability is higher, consequently, the former scheme is chooseed for use to this embodiment.
Further, when a plurality of impedance adjusting circuits 2 are arranged, the impedance value to be increased can be determined according to the voltage value after the bus is short-circuited, so that the resistance value of part of the power supply lines can be accurately adjusted.
Fig. 6 is a flowchart of a short-circuit fault protection circuit control method according to an embodiment of the present application, and as shown in fig. 6, the method includes:
s10: and acquiring a voltage detection signal which is a detection value of a voltage detection circuit 3 connected with the line to be detected.
S11: and judging whether the voltage detection signal is lower than a voltage threshold value or not.
S12: if the voltage is lower than the voltage threshold, the resistance of the impedance adjusting circuit 2 is controlled to increase.
The application provides a short-circuit fault protection circuit control method, which is applied to the short-circuit fault protection circuit and comprises the following steps: the voltage detection circuit is connected with the line to be detected to collect voltage detection signals and provide data support for judging whether the line to be detected is short-circuited. The controller is connected with the voltage detection circuit to obtain a voltage detection signal and judge whether the voltage detection signal is lower than a voltage threshold value, so that whether the line to be detected is short-circuited or not is determined. The controller is also connected with the impedance adjusting circuit and controls the resistance of the impedance adjusting circuit to increase when the voltage detection signal is lower than the voltage threshold value. The first end of the impedance adjusting circuit is connected with a direct current power supply of the circuit to be detected, and the second end of the impedance adjusting circuit is connected with each power supply circuit of the power supply capacitor, so that the impedance of each power supply circuit of the circuit to be detected is adjusted according to the control instruction. Therefore, when the short circuit of the circuit to be detected is detected, the impedance of the impedance adjusting circuit is controlled by the controller to be increased, so that the impedance connected with the circuit to be detected is increased, the electric energy in the circuit to be detected can be released on the impedance, the circuit device is prevented from being burnt due to the short circuit, the circuit is ensured to be conducted, other devices in the circuit work, and the stability of the inverter circuit is improved.
As a preferred embodiment, in order to prevent the short-circuit fault protection circuit from being damaged by short circuit before being enabled, on the basis of the above embodiment, before the step of acquiring the voltage detection signal, the method further includes:
the impedance adjusting circuit 2 is controlled to enter a high impedance state.
In one embodiment, the default state of the short-circuit fault protection circuit is a high impedance state to ensure that the inverter circuit will not fail due to a short circuit if the operation and maintenance personnel do not find the machine abnormal and the time span is large. As the voltage PV supplied from the photovoltaic panel side increases, the controller 1 is started, and the operating state of the inverter circuit and whether or not a short circuit has occurred can be determined based on the voltage detection value in the bus bar, thereby adjusting the resistance value of the impedance adjusting circuit.
In the above embodiments, the control method of the short-circuit fault protection circuit is described in detail, and the present application also provides embodiments corresponding to the control device of the short-circuit fault protection circuit. It should be noted that the present application describes the embodiments of the apparatus portion from two perspectives, one from the perspective of the function module and the other from the perspective of the hardware.
Fig. 7 is a structural diagram of a short-circuit fault protection circuit control device according to an embodiment of the present application, and as shown in fig. 7, the device includes:
the acquisition module 10 is configured to acquire a voltage detection signal, where the voltage detection signal is a detection value of a voltage detection circuit 3 connected to a line to be detected;
the judging module 11 is configured to judge whether the voltage detection signal is lower than a voltage threshold;
and the control module 12 is used for controlling the resistance of the impedance adjusting circuit 2 to increase if the voltage is lower than the voltage threshold.
Since the embodiments of the apparatus portion and the method portion correspond to each other, please refer to the description of the embodiments of the method portion for the embodiments of the apparatus portion, which is not repeated here.
The application provides a short-circuit fault protection circuit controlling means is applied to above-mentioned short-circuit fault protection circuit, includes: a short-circuit fault protection circuit of a controller, at least 1 impedance adjusting circuit and a voltage detection circuit; the voltage detection circuit is connected with the line to be detected to collect voltage detection signals and provide data support for judging whether the line to be detected is short-circuited. The controller is connected with the voltage detection circuit to obtain a voltage detection signal and judge whether the voltage detection signal is lower than a voltage threshold value or not, so that whether the line to be detected is short-circuited or not is determined. The controller is also connected with the impedance adjusting circuit and controls the resistance of the impedance adjusting circuit to increase when the voltage detection signal is lower than the voltage threshold value. The first end of the impedance adjusting circuit is connected with a direct current power supply of the line to be detected, and the second end of the impedance adjusting circuit is connected with each power supply circuit of the power supply capacitor, so that the impedance of each power supply circuit of the line to be detected is adjusted according to the control instruction. Therefore, when the short circuit of the circuit to be detected is detected, the controller controls the impedance of the impedance adjusting circuit to be increased, so that the impedance connected with the circuit to be detected is increased, the electric energy in the circuit to be detected can be released on the impedance, the circuit device is prevented from being burnt due to the short circuit, the circuit is ensured to be conducted, other devices in the circuit work, and the stability of the inverter circuit is improved.
Fig. 8 is a structural diagram of a short-circuit protection circuit control device according to another embodiment of the present application, and as shown in fig. 8, the short-circuit protection circuit control device includes: a memory 20 for storing a computer program;
a processor 21 for implementing the steps of the method for acquiring the voltage detection signal as described in the above embodiments when executing the computer program.
The processor 21 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and the like. The Processor 21 may be implemented in hardware using at least one of a Digital Signal Processor (DSP), a Field-Programmable Gate Array (FPGA), and a Programmable Logic Array (PLA). The processor 21 may also include a main processor and a coprocessor, where the main processor is a processor for Processing data in an awake state, and is also called a Central Processing Unit (CPU); a coprocessor is a low power processor for processing data in a standby state. In some embodiments, the processor 21 may be integrated with a Graphics Processing Unit (GPU) which is responsible for rendering and drawing the content required to be displayed by the display screen. In some embodiments, the processor 21 may further include an Artificial Intelligence (AI) processor for processing computational operations related to machine learning.
The memory 20 may include one or more computer-readable storage media, which may be non-transitory. Memory 20 may also include high speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In this embodiment, the memory 20 is at least used for storing a computer program 201, wherein after being loaded and executed by the processor 21, the computer program can implement the relevant steps of the short-circuit fault protection circuit control method disclosed in any one of the foregoing embodiments. In addition, the resources stored in the memory 20 may also include an operating system 202, data 203, and the like, and the storage manner may be a transient storage manner or a permanent storage manner. Operating system 202 may include, among other things, windows, unix, linux, etc. Data 203 may include, but is not limited to, voltage detection signals, etc.
In some embodiments, the short-circuit fault protection circuit control device may further include a display 22, an input/output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.
Those skilled in the art will appreciate that the configuration shown in fig. 8 does not constitute a limitation on the short-circuit fault protection circuit control and may include more or fewer components than those shown.
The short-circuit fault protection circuit control device provided by the embodiment of the application comprises a memory and a processor, wherein when the processor executes a program stored in the memory, the following method can be realized:
acquiring a voltage detection signal, wherein the voltage detection signal is a detection value of a voltage detection circuit connected with a line to be detected;
judging whether the voltage detection signal is lower than a voltage threshold value or not;
and if the voltage is lower than the voltage threshold value, controlling the resistance of the impedance adjusting circuit to increase.
Finally, the application also provides a corresponding embodiment of the computer readable storage medium. The computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps as set forth in the above-mentioned method embodiments.
It is to be understood that if the method in the above embodiments is implemented in the form of software functional units and sold or used as a stand-alone product, it can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium and executes all or part of the steps of the methods described in the embodiments of the present application, or all or part of the technical solutions. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The short-circuit fault protection circuit and the photovoltaic inverter circuit provided by the application are described in detail above. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A short-circuit fault protection circuit, comprising:
the circuit comprises a controller (1), an impedance adjusting circuit (2) and a voltage detection circuit (3), wherein the number of the impedance adjusting circuit (2) is at least 1;
the voltage detection circuit (3) is connected with a line to be detected so as to collect a voltage detection signal;
the first end of the impedance adjusting circuit (2) is connected with a direct current power supply of the line to be detected, and the second end of the impedance adjusting circuit (2) is connected with each power supply circuit of the power supply capacitor;
the controller (1) is connected with the voltage detection circuit (3) to obtain the voltage detection signal and judge whether the voltage detection signal is lower than a voltage threshold value;
the controller (1) is further connected with the impedance adjusting circuit (2) and controls the resistance of the impedance adjusting circuit (2) to increase when the voltage detection signal is lower than the voltage threshold value.
2. The short-circuit fault protection circuit of claim 1, further comprising a direct current supply circuit;
the direct current power supply circuit comprises a first resistive device and a first diode;
the first end of the first resistive device is connected with the direct current power supply, the second end of the first resistive device is connected with the anode of the first diode, and the cathode of the first diode is connected with the controller (1).
3. The short-circuit fault protection circuit of claim 1, further comprising a three-phase rectifier bridge circuit;
the first end of the three-phase rectifier bridge circuit is connected with the controller (1), and the second end of the three-phase rectifier bridge circuit is connected with an alternating current power grid.
4. The short-circuit fault protection circuit of claim 1, further comprising: an AC/DC hybrid power supply circuit;
the alternating current-direct current hybrid power supply circuit comprises: the three-phase rectifier circuit comprises a first resistive device, a first diode and a three-phase rectifier bridge circuit;
the first end of the three-phase rectifier bridge circuit is connected with the controller (1), and the second end of the three-phase rectifier bridge circuit is connected with an alternating current power grid;
the first end of the first resistive device is connected with the direct current power supply, the second end of the first resistive device is connected with the anode of the first diode, and the cathode of the first diode is connected with the controller (1).
5. The short-circuit fault protection circuit according to claim 1, characterized in that the impedance adjusting circuit (2) comprises at least a first path and a second path;
the first path comprises a first switch and a second resistive device, the second path comprises a second switch and a third resistive device, and the resistance of the third resistive device is far greater than that of the second resistive device;
the control end of the first switch and the control end of the second switch are both connected with the controller, the first end of the first switch and the second end of the second switch are both connected with the direct-current power supply, the second end of the second resistive device is connected with the second end of the third resistive device, and the connection point of the first end of the first switch and the second end of the second switch is used as the second end of the impedance adjusting circuit (2);
the first end of the second resistive device is connected to the second end of the first switch, and the first end of the third resistive device is connected to the second end of the second switch.
6. The short-circuit fault protection circuit of claim 1, further comprising: a resetting device;
the reset device is connected with the impedance adjusting circuit (2) and used for controlling the impedance adjusting circuit to enter a high-impedance state when the short-circuit fault protection circuit is powered off.
7. The short-circuit fault protection circuit of claim 5, wherein the first switch and the second switch are both relays.
8. The short-circuit fault protection circuit of claim 1, further comprising: an alarm device;
the alarm device is connected with the controller (1) and used for sending alarm information to a manager under the control of the controller (1) when the voltage detection signal is lower than the voltage threshold value.
9. The short-circuit fault protection circuit of claim 8, wherein the alarm device comprises a buzzer and an indicator light.
10. A photovoltaic inverter circuit comprising the short-circuit fault protection circuit of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222346167.6U CN218041199U (en) | 2022-09-02 | 2022-09-02 | Short-circuit fault protection circuit and photovoltaic inverter circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116679193A (en) * | 2023-07-28 | 2023-09-01 | 同方泰德国际科技(北京)有限公司 | Circuit fault detection method and control circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116679193A (en) * | 2023-07-28 | 2023-09-01 | 同方泰德国际科技(北京)有限公司 | Circuit fault detection method and control circuit |
| CN116679193B (en) * | 2023-07-28 | 2023-10-31 | 同方泰德国际科技(北京)有限公司 | Circuit fault detection method and control circuit |
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