Photovoltaic power supply inverter circuit

Abstract

The utility model discloses an inverter circuit for photovoltaic power supply, which relates to the technical field of photovoltaic inversion and comprises a photovoltaic module used for photovoltaic conversion, voltage stabilization and filtering; the inversion control module is used for full-bridge inversion adjustment and half-bridge inversion adjustment; the temperature detection module is used for over-temperature detection; the peak detection module is used for peak detection; the voltage comparison module is used for detecting the magnitude of the electric energy output by the peak value detection module and a set voltage threshold value; the inversion switching module is used for performing voltage distribution control on the inversion control module when the electric energy output by the peak value detection module is equal to a voltage threshold value and is over-temperature; and the output module is used for electric energy receiving and filtering processing. The inverter circuit for photovoltaic power supply can carry out full-bridge inversion adjustment processing on electric energy generated by the photovoltaic module, and when the electric energy output by the peak detection module is equal to a voltage threshold value and is over-temperature, the inverter control module is controlled to cooperate with the inverter switching module to carry out half-bridge inversion adjustment, so that the service life of the circuit is prolonged, and the safety of the circuit is improved.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic inverter technology, specifically a photovoltaic power supply inverter circuit. Background Technology

[0002] Photovoltaic power supply is a technology that uses the photovoltaic effect of photovoltaic cells to directly convert solar radiation energy into electrical energy. The electrical energy provided by photovoltaics is direct current (DC). To provide alternating current (AC) or meet different voltage and current requirements, photovoltaic power supply generally uses an inverter circuit. The inverter circuit of existing photovoltaic power supply technology generally consists of four sets of MOSFETs and a driver device to perform full-bridge inverter operation. However, with the frequent use of MOSFETs and driver devices, the temperature is prone to rise, which reduces the regulation accuracy and lifespan of the MOSFETs. Therefore, it needs to be improved. Utility Model Content

[0003] This utility model embodiment provides a photovoltaic power supply inverter circuit to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A photovoltaic power supply inverter circuit includes: a photovoltaic module, an inverter control module, a temperature detection module, an output module, a peak detection module, a voltage comparison module, and an inverter switching module.

[0006] A photovoltaic module is used to perform photoelectric conversion and filtering to output the first electrical energy, and to perform voltage regulation and filtering on the first electrical energy to output the second electrical energy.

[0007] The inverter control module is connected to the photovoltaic module, the output module and the inverter switching module. It is used to perform full-bridge inverter regulation on the second electrical energy and output the first AC electrical energy. When the second electrical energy is received, the first AC electrical energy is transmitted to the output module. When the first control signal is received from the inverter switching module, the transmission of the first AC electrical energy is stopped and the second electrical energy is performed half-bridge inverter regulation on the second electrical energy and output the second AC electrical energy.

[0008] A temperature detection module, connected to the photovoltaic module, is used to receive the second electrical energy and detect the temperature of the inverter control module. When the detected temperature signal is greater than the set temperature threshold, a second control signal is output.

[0009] A peak detection module, connected to the output module, is used to detect the peak value of the electrical energy input to the output module and output a first detection signal;

[0010] A voltage comparison module, connected to the peak detection module, is used to set a voltage threshold and output a third control signal when the first detection signal is lower than the voltage threshold.

[0011] The inverter switching module is connected to the temperature detection module, photovoltaic module, output module and voltage comparison module. When the second control signal and the third control signal are received, the module outputs the first control signal, receives the first electrical energy, and when the inverter control module performs half-bridge inverter regulation, it performs voltage distribution control on the inverter control module and transmits the second AC electrical energy output by the inverter control module to the output module.

[0012] The output module is used to filter the input first AC power or second AC power.

[0013] As a further embodiment of this utility model: the photovoltaic module includes a photovoltaic power generation panel, a first capacitor, a first voltage regulator and a second capacitor; the inverter control module includes a microcontroller, a first power transistor, a second power transistor, a third power transistor, a fourth power transistor, a first switch transistor, a second switch transistor, a third thyristor, a first resistor and a third switch transistor;

[0014] Preferably, the first end of the photovoltaic panel is connected to one end of the first capacitor, the IN terminal of the first voltage regulator, the drain of the first power transistor, and the drain of the third power transistor. The OUT terminal of the first voltage regulator is connected to the temperature detection module and one end of the first resistor, and is connected to the GND terminal of the first voltage regulator, the other end of the first capacitor, the second end of the photovoltaic panel, the source of the second power transistor, and the source of the fourth power transistor. The source of the first power transistor is connected to the drain of the second power transistor, the source of the third power transistor is connected to the drain of the fourth power transistor, and the first end of the third thyristor. The second end of the third thyristor is connected to the output module. The control terminal of the third thyristor is connected to the collector of the third switch and the other end of the first resistor. The emitter of the third switch is connected to the emitter of the first switch, the emitter of the second switch, and ground. The gate of the first power transistor and the gate of the second power transistor are respectively connected to the first and second terminals of the microcontroller. The gate of the third power transistor is connected to the third terminal of the microcontroller and the collector of the first switch. The gate of the fourth power transistor is connected to the fourth terminal of the microcontroller and the collector of the second switch. The base of the second switch is connected to the base of the first switch, the base of the third switch, and the inverter switching module.

[0015] As a further embodiment of this utility model: the output module includes a first inductor, a fifth capacitor, and an output port; the peak detection module includes a second resistor, a third resistor, a first operational amplifier, a fourth resistor, a first diode, a sixth capacitor, and a fifth resistor;

[0016] Preferably, the first end of the output port is connected to one end of the second resistor and is connected to one end of the fifth capacitor and the source of the first power transistor through the first inductor. The second end of the output port is connected to the other end of the fifth capacitor, the control terminal of the third thyristor, and one end of the third resistor. The other end of the third resistor is connected to the other end of the second resistor and the non-inverting input of the first operational amplifier. The inverting input of the first operational amplifier is connected to the cathode of the first diode, one end of the sixth capacitor, the first end of the fifth resistor, the second end of the fifth resistor, and the voltage comparator module through the fourth resistor. The other end of the sixth capacitor is grounded.

[0017] As a further embodiment of this invention: the voltage comparison module includes a first threshold device and a first comparator;

[0018] Preferably, the non-inverting input of the first comparator is connected to the first threshold device, the inverting input of the first comparator is connected to the second terminal of the fifth resistor, and the output of the first comparator is connected to the inverter switching module.

[0019] As a further improvement of this utility model: the inverter switching module includes a first logic chip, a third capacitor, a fourth capacitor, a first thyristor, and a second thyristor;

[0020] Preferably, the B terminal of the first logic chip is connected to the output terminal of the first comparator, the A terminal of the first logic chip is connected to the temperature detection module, the Y terminal of the first logic chip is connected to the base of the third switching transistor, the control terminal of the first thyristor, and the control terminal of the second thyristor, one end of the first thyristor is connected to the drain of the first power transistor through the third capacitor, the other end of the first thyristor is connected to one end of the second thyristor and the second end of the third thyristor, and the other end of the second thyristor is connected to the source of the second power transistor through the fourth capacitor.

[0021] As a further improvement of this utility model: the temperature detection module includes a thermistor, a sixth resistor, a first potentiometer, and a second diode;

[0022] Preferably, one end of the thermistor is connected to the OUT terminal of the first voltage regulator, the other end of the thermistor is connected to one end of the first potentiometer and grounded through the sixth resistor, the other end of the first potentiometer and the slider end are both connected to the cathode of the second diode, and the anode of the second diode is connected to the A terminal of the first logic chip.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows: The inverter circuit of this utility model can perform full-bridge inverter regulation processing on the power generated by the photovoltaic module by the inverter control module and output it by the output module. At the same time, the peak detection module performs peak detection on the output power and the temperature detection module performs over-temperature detection. When the output power is lower than the set voltage threshold and over-temperature occurs, the inverter mode of the inverter control module will be changed and the inverter switching module will be used to perform half-bridge inverter regulation processing to reduce the temperature of the inverter control module and maintain normal power supply, thereby improving the service life of the inverter control module and the circuit safety. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic block diagram of a photovoltaic power supply inverter circuit provided as an example of the present invention.

[0026] Figure 2 A circuit diagram of a photovoltaic power supply inverter circuit provided for this utility model embodiment.

[0027] Figure 3 A connection circuit diagram of the temperature detection module provided for this utility model embodiment. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In one embodiment, see Figure 1 A photovoltaic power supply inverter circuit includes: a photovoltaic module 1, an inverter control module 2, a temperature detection module 3, an output module 4, a peak detection module 5, a voltage comparison module 6, and an inverter switching module 7.

[0030] Specifically, photovoltaic module 1 is used to perform photoelectric conversion and filtering and output first electrical energy, and to perform voltage regulation and filtering on the first electrical energy and output second electrical energy;

[0031] Inverter control module 2 is connected to photovoltaic module 1, output module 4 and inverter switching module 7. It is used to perform full-bridge inverter regulation on the second power and output the first AC power. When the second power is received, the first AC power is transmitted to output module 4. When the first control signal is received from inverter switching module 7, the transmission of the first AC power is stopped and the second power is performed half-bridge inverter regulation on the second power and output the second AC power.

[0032] Temperature detection module 3 is connected to photovoltaic module 1 and is used to receive the second electrical energy and perform temperature detection on inverter control module 2. When the detected temperature signal is greater than the set temperature threshold, it outputs the second control signal.

[0033] Peak detection module 5, connected to the output module 4, is used to detect the peak value of the electrical energy input to the output module 4 and output a first detection signal;

[0034] The voltage comparison module 6 is connected to the peak detection module 5 and is used to set a voltage threshold and output a third control signal when the first detection signal is lower than the voltage threshold.

[0035] The inverter switching module 7 is connected to the temperature detection module 3, photovoltaic module 1, output module 4 and voltage comparison module 6. When receiving the second control signal and the third control signal, it outputs the first control signal, receives the first electrical energy, and when the inverter control module 2 performs half-bridge inverter adjustment, it performs voltage distribution control on the inverter control module 2 and transmits the second AC electrical energy output by the inverter control module 2 to the output module 4.

[0036] Output module 4 is used to filter the input first AC power or second AC power.

[0037] In a specific embodiment, the photovoltaic module 1 can be a photovoltaic circuit composed of a photovoltaic panel, capacitor, and voltage regulator, capable of photoelectric conversion, voltage regulation, and filtering. The inverter control module 2 can be an inverter control circuit composed of a field-effect transistor, microcontroller, and thyristor, capable of full-bridge and half-bridge inverter regulation. The temperature detection module 3 can be a temperature detection circuit composed of a thermistor (NTC), diode, and potentiometer, capable of setting a temperature threshold and outputting a high-level signal (a second control signal) when the detected signal exceeds the temperature threshold; the set temperature threshold must not exceed the maximum temperature of the inverter control module 2. The output module 4 can be an output circuit composed of a capacitor, inductor, and output port, performing power filtering and... Power reception; the peak detection module 5 can be a peak detection circuit composed of resistors, operational amplifiers, capacitors, etc., to perform voltage sampling and peak detection on the power input to the output module 4; the voltage comparison module 6 can be a voltage comparison circuit composed of comparators and threshold devices, which can set a voltage threshold and perform voltage comparison. The voltage threshold is the maximum voltage value that the inverter control module 2 and the inverter switching module 7 can output when performing half-bridge inverter regulation; the inverter switching module 7 can be an inverter switching circuit composed of capacitors, thyristors, and logic chips, which can perform voltage distribution control on the inverter control module 2 when the power output of the peak detection module 5 is equal to the voltage threshold and the temperature is too high, thereby controlling the inverter control module 2 to complete the half-bridge inverter regulation.

[0038] In another embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The photovoltaic module 1 includes a photovoltaic power generation panel, a first capacitor C1, a first voltage regulator IC1, and a second capacitor C2; the inverter control module 2 includes a microcontroller, a first power transistor Q1, a second power transistor Q2, a third power transistor Q3, a fourth power transistor Q4, a first switch V1, a second switch V2, a third thyristor S3, a first resistor R1, and a third switch V3.

[0039] Specifically, the first end of the photovoltaic panel is connected to one end of the first capacitor C1, the IN terminal of the first voltage regulator IC1, the drain of the first power transistor Q1, and the drain of the third power transistor Q3. The OUT terminal of the first voltage regulator IC1 is connected to the temperature detection module 3 and one end of the first resistor R1, and through the second capacitor C2, it is connected to the GND terminal of the first voltage regulator IC1, the other end of the first capacitor C1, the second end of the photovoltaic panel, the source of the second power transistor Q2, and the source of the fourth power transistor Q4. The source of the first power transistor Q1 is connected to the drain of the second power transistor Q2, the source of the third power transistor Q3 is connected to the drain of the fourth power transistor Q4, and the first end of the third thyristor S3. The second end of the third thyristor S3 is connected to... Output module 4, the control terminal of the third thyristor S3 is connected to the collector of the third switch V3 and the other end of the first resistor R1, the emitter of the third switch V3 is connected to the emitter of the first switch V1, the emitter of the second switch V2 and ground, the gate of the first power transistor Q1 and the gate of the second power transistor Q2 are respectively connected to the first and second terminals of the microcontroller, the gate of the third power transistor Q3 is connected to the third terminal of the microcontroller and the collector of the first switch V1, the gate of the fourth power transistor Q4 is connected to the fourth terminal of the microcontroller and the collector of the second switch V2, and the base of the second switch V2 is connected to the base of the first switch V1, the base of the third switch V3 and the inverter switching module 7.

[0040] In a specific embodiment, the first voltage regulator IC1 can be a 7805 voltage regulator; the microcontroller can be composed of a microcontroller and a driver, with the microcontroller providing pulse signals and the driver enhancing the driving capability of the pulse signals to complete the full-bridge inverter control and half-bridge inverter control of the first power transistor Q1, the second power transistor Q2, the third power transistor Q3, and the fourth power transistor Q4; the first power transistor Q1, the second power transistor Q2, the third power transistor Q3, and the fourth power transistor Q4 can all be N-channel MOSFETs; the third thyristor S3 can be a bidirectional thyristor; and the third switching transistor V3 can be an NPN transistor.

[0041] Furthermore, the output module 4 includes a first inductor L1, a fifth capacitor C5, and an output port; the peak detection module 5 includes a second resistor R2, a third resistor R3, a first operational amplifier OP1, a fourth resistor R4, a first diode D1, a sixth capacitor C6, and a fifth resistor R5.

[0042] Specifically, the first end of the output port is connected to one end of the second resistor R2 and is connected to one end of the fifth capacitor C5 and the source of the first power transistor Q1 through the first inductor L1. The second end of the output port is connected to the other end of the fifth capacitor C5, the control terminal of the third thyristor S3 and one end of the third resistor R3. The other end of the third resistor R3 is connected to the other end of the second resistor R2 and the non-inverting terminal of the first operational amplifier OP1. The inverting terminal of the first operational amplifier OP1 is connected to the cathode of the first diode D1, one end of the sixth capacitor C6, the first end of the fifth resistor R5, the second end of the fifth resistor R5 and the voltage comparison module 6 through the fourth resistor R4. The other end of the sixth capacitor C6 is grounded.

[0043] In a specific embodiment, the second resistor R2 and the third resistor R3 are used for voltage sampling; the first operational amplifier OP1 can be an OP07 operational amplifier, which, together with the first diode D1, the fourth resistor R4, the sixth capacitor C6 and the fifth resistor R5, performs peak detection.

[0044] Furthermore, the voltage comparison module 6 includes a first threshold device and a first comparator A1;

[0045] Specifically, the non-inverting input of the first comparator A1 is connected to the first threshold device, the inverting input of the first comparator A1 is connected to the second terminal of the fifth resistor R5, and the output terminal of the first comparator A1 is connected to the inverter switching module 7.

[0046] In a specific embodiment, the first threshold device may consist of a reference power supply and a resistor to provide a voltage threshold; the first comparator A1 may be an LM358 comparator.

[0047] Furthermore, the inverter switching module 7 includes a first logic chip J1, a third capacitor C3, a fourth capacitor C4, a first thyristor S1, and a second thyristor S2.

[0048] Specifically, the B terminal of the first logic chip J1 is connected to the output terminal of the first comparator A1, the A terminal of the first logic chip J1 is connected to the temperature detection module 3, the Y terminal of the first logic chip J1 is connected to the base of the third switching transistor V3, the control terminal of the first thyristor S1, and the control terminal of the second thyristor S2, one end of the first thyristor S1 is connected to the drain of the first power transistor Q1 through the third capacitor C3, the other end of the first thyristor S1 is connected to one end of the second thyristor S2 and the second end of the third thyristor S3, and the other end of the second thyristor S2 is connected to the source of the second power transistor Q2 through the fourth capacitor C4.

[0049] In a specific embodiment, the first logic chip J1 can be an AND gate chip; the first thyristor S1 and the second thyristor S2 can both be bidirectional thyristors.

[0050] Furthermore, the temperature detection module 3 includes a thermistor NTC, a sixth resistor R6, a first potentiometer RP1, and a second diode D2;

[0051] Specifically, one end of the thermistor NTC is connected to the OUT terminal of the first voltage regulator IC1, and the other end of the thermistor NTC is connected to one end of the first potentiometer RP1 and grounded through the sixth resistor R6. The other end of the first potentiometer RP1 and the slider end are both connected to the cathode of the second diode D2, and the anode of the second diode D2 is connected to the A terminal of the first logic chip J1.

[0052] In a specific embodiment, the above-mentioned thermistor NTC can be a negative temperature coefficient thermistor; the above-mentioned first potentiometer RP1 and second diode D2 set the temperature threshold.

[0053] In this embodiment of a photovoltaic power supply inverter circuit, a photovoltaic panel performs photoelectric conversion, a first capacitor C1 filters and outputs first electrical energy, a first voltage regulator IC1 and a second capacitor C2 perform voltage regulation and filtering and output second electrical energy, a microcontroller controls the first power transistor Q1, the second power transistor Q2, the third power transistor Q3 and the fourth power transistor Q4 to perform full-bridge inverter regulation of the first electrical energy, the second electrical energy triggers the third thyristor S3 to conduct through the first resistor R1, so that the regulated electrical energy is filtered by the first inductor L1 and the fifth capacitor C5 and transmitted to the output port, the electrical energy transmitted by the second resistor R2 and the third resistor R3 is sampled for voltage, and the first operational amplifier OP1, together with the first diode D1, the fourth resistor R4, the fifth resistor R5 and the sixth capacitor C6, performs peak detection. When the detected peak voltage exceeds the voltage threshold set by the first threshold device, the first comparator A1 outputs a high level, and the B terminal of the first logic chip J1 becomes high. If the thermistor NTC and the sixth resistor R6 perform temperature detection at this time, and the detected signal exceeds the temperature threshold set by the first potentiometer RP1 and the second diode D2, the A terminal of the first logic chip J1 becomes high. The Y terminal of the first logic chip J1 will control the first switch V1, the second switch V2, the third switch V3, the first thyristor S1, and the second thyristor S2 to conduct, so that the third capacitor C3 and the fourth capacitor C4 cooperate with the first power transistor Q1 and the second power transistor Q2 to perform half-bridge inverter operation, thereby reducing the number of power transistors used, reducing the difficulty of controlling the power transistors, and thus reducing the operating temperature.

[0054] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A photovoltaic power generation inverter circuit, characterized in that, The photovoltaic power supply inverter circuit includes: a photovoltaic module, an inverter control module, a temperature detection module, an output module, a peak detection module, a voltage comparison module, and an inverter switching module; The photovoltaic module is used to perform photoelectric conversion and filtering and output first electrical energy, and to perform voltage regulation and filtering on the first electrical energy and output second electrical energy. The inverter control module is connected to the photovoltaic module, the output module and the inverter switching module. It is used to perform full-bridge inverter regulation on the second electrical energy and output the first AC electrical energy. When the second electrical energy is received, the first AC electrical energy is transmitted to the output module. When the first control signal is received from the inverter switching module, the transmission of the first AC electrical energy is stopped and the second electrical energy is performed half-bridge inverter regulation on the second electrical energy and output the second AC electrical energy. The temperature detection module is connected to the photovoltaic module and is used to receive the second electrical energy and detect the temperature of the inverter control module. When the detected temperature signal is greater than the set temperature threshold, the second control signal is output. The peak detection module is connected to the output module and is used to detect the peak value of the electrical energy input to the output module and output a first detection signal. The voltage comparison module is connected to the peak detection module and is used to set a voltage threshold and output a third control signal when the first detection signal is lower than the voltage threshold. The inverter switching module is connected to the temperature detection module, photovoltaic module, output module and voltage comparison module. When receiving the second control signal and the third control signal, it outputs the first control signal, receives the first electrical energy, and when the inverter control module performs half-bridge inverter regulation, it performs voltage distribution control on the inverter control module and transmits the second AC electrical energy output by the inverter control module to the output module. The output module is used to filter the input first AC power or second AC power.

2. The photovoltaic power supply inverter circuit according to claim 1, characterized in that, The photovoltaic module includes a photovoltaic power generation panel, a first capacitor, a first voltage regulator, and a second capacitor; the inverter control module includes a microcontroller, a first power transistor, a second power transistor, a third power transistor, a fourth power transistor, a first switching transistor, a second switching transistor, a third thyristor, a first resistor, and a third switching transistor. The first end of the photovoltaic panel is connected to one end of the first capacitor, the IN terminal of the first voltage regulator, the drain of the first power transistor, and the drain of the third power transistor. The OUT terminal of the first voltage regulator is connected to the temperature detection module and one end of the first resistor, and is connected to the GND terminal of the first voltage regulator, the other end of the first capacitor, the second end of the photovoltaic panel, the source of the second power transistor, and the source of the fourth power transistor. The source of the first power transistor is connected to the drain of the second power transistor, the source of the third power transistor is connected to the drain of the fourth power transistor, and the first end of the third thyristor. The second end of the third thyristor is connected to the output module. The control terminal of the third thyristor is connected to the collector of the third switch and the other end of the first resistor. The emitter of the third switch is connected to the emitter of the first switch, the emitter of the second switch, and ground. The gate of the first power transistor and the gate of the second power transistor are respectively connected to the first and second terminals of the microcontroller. The gate of the third power transistor is connected to the third terminal of the microcontroller and the collector of the first switch. The gate of the fourth power transistor is connected to the fourth terminal of the microcontroller and the collector of the second switch. The base of the second switch is connected to the base of the first switch, the base of the third switch, and the inverter switching module.

3. The photovoltaic power supply inverter circuit according to claim 2, characterized in that, The output module includes a first inductor, a fifth capacitor, and an output port; the peak detection module includes a second resistor, a third resistor, a first operational amplifier, a fourth resistor, a first diode, a sixth capacitor, and a fifth resistor. The first end of the output port is connected to one end of the second resistor and is connected to one end of the fifth capacitor and the source of the first power transistor through the first inductor. The second end of the output port is connected to the other end of the fifth capacitor, the control terminal of the third thyristor, and one end of the third resistor. The other end of the third resistor is connected to the other end of the second resistor and the non-inverting input of the first operational amplifier. The inverting input of the first operational amplifier is connected to the cathode of the first diode, one end of the sixth capacitor, the first end of the fifth resistor, the second end of the fifth resistor, and the voltage comparator module through the fourth resistor. The other end of the sixth capacitor is grounded.

4. The photovoltaic power supply inverter circuit according to claim 3, characterized in that, The voltage comparison module includes a first threshold device and a first comparator; The non-inverting input of the first comparator is connected to the first threshold device, the inverting input of the first comparator is connected to the second terminal of the fifth resistor, and the output of the first comparator is connected to the inverter switching module.

5. The photovoltaic power supply inverter circuit according to claim 4, characterized in that, The inverter switching module includes a first logic chip, a third capacitor, a fourth capacitor, a first thyristor, and a second thyristor. The B terminal of the first logic chip is connected to the output terminal of the first comparator, the A terminal of the first logic chip is connected to the temperature detection module, the Y terminal of the first logic chip is connected to the base of the third switching transistor, the control terminal of the first thyristor, and the control terminal of the second thyristor, one end of the first thyristor is connected to the drain of the first power transistor through the third capacitor, the other end of the first thyristor is connected to one end of the second thyristor and the second end of the third thyristor, and the other end of the second thyristor is connected to the source of the second power transistor through the fourth capacitor.

6. The photovoltaic power supply inverter circuit according to claim 5, characterized in that, The temperature detection module includes a thermistor, a sixth resistor, a first potentiometer, and a second diode; One end of the thermistor is connected to the OUT terminal of the first voltage regulator, and the other end of the thermistor is connected to one end of the first potentiometer and grounded through the sixth resistor. The other end of the first potentiometer and the slider end are both connected to the cathode of the second diode, and the anode of the second diode is connected to the A terminal of the first logic chip.

Images