Safe driving control circuit of photovoltaic inverter

Abstract

The invention discloses a safety driving control circuit of a photovoltaic inverter, which relates to the technical field of photovoltaic inverters, and comprises a first driving module and a second driving module which are used for performing amplification and crosstalk suppression processing on pulse signals provided by a micro-control module, and driving a photovoltaic inverter module to perform inversion in cooperation with a safety driving module, the protection module controls an upper bridge arm switch tube of a positive half cycle or an upper bridge arm switch tube of a negative half cycle, which is not in a working state, in the photovoltaic inversion module to be kept at a low potential according to the state of the pulse signal; and the micro-control module is controlled to maintain the driving work of the upper bridge arm switch tube in the positive half period through the second driving module and the safety driving module, and when the second driving module is detected to be abnormal, the driving work of the upper bridge arm switch tube in the negative half period is maintained. The safe driving control circuit of the photovoltaic inverter can avoid the situation of wrong conduction, maintain the inversion work and improve the electric energy conversion efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaic inverter technology, and particularly relates to a photovoltaic inverter safe driving control circuit. BACKGROUND

[0002] The photovoltaic inverter is an important device in the photovoltaic power generation system, and realizes DC-AC conversion work. In the prior art, in order to improve the driving efficiency of the photovoltaic inverter, a driving amplification circuit composed of a field effect transistor, a resistor and a driving power supply is generally used to improve the driving ability of the driving signal. However, when the driving amplification circuit fails, the photovoltaic inverter is prone to mis-conduction. In addition, when the driving amplification circuit fails, the driving work cannot be normally maintained, so that the photovoltaic inverter cannot continue to perform inversion work, and the utilization rate of photovoltaic power is reduced. Therefore, there is room for improvement. SUMMARY

[0003] The embodiment of the present application provides a photovoltaic inverter safe driving control circuit to solve the problems in the background art.

[0004] According to the embodiment of the present application, a photovoltaic inverter safe driving control circuit is provided, which comprises: a micro control module connected with a driving detection module, used for providing a first pulse signal and a second pulse signal, and stopping working when receiving a first fault signal and a second fault signal output by the driving detection module;

[0005] A first driving module is connected with the micro control module and a second driving module, used for transmitting the first pulse signal to the second driving module when receiving the first fault signal, and driving amplifying and crosstalk suppressing the input first pulse signal or the second pulse signal transmitted by the second driving module and outputting a first driving signal;

[0006] The second driving module is connected with the micro control module, used for transmitting the second pulse signal to the first driving module when receiving the second fault signal, and driving amplifying and crosstalk suppressing the input second pulse signal or the first pulse signal transmitted by the first driving module and outputting a second driving signal;

[0007] The driving detection module is connected with the first driving signal and the second driving module, used for outputting the first fault signal when receiving the first pulse signal and not receiving the first driving signal, and outputting the second fault signal when receiving the second pulse signal and not receiving the second driving signal;

[0008] The protection module is connected with the micro-control module and the photovoltaic inversion module, and is configured to set a voltage threshold, and control the upper bridge arm switch tube of the positive half cycle to stop working when the voltage of the upper bridge arm switch tube of the positive half cycle of the photovoltaic inversion module is greater than the voltage threshold and no first pulse signal is received, and control the upper bridge arm switch tube of the negative half cycle to stop working when the voltage of the upper bridge arm switch tube of the negative half cycle of the photovoltaic inversion module is greater than the voltage threshold and no second pulse signal is received.

[0009] The safety driving module is connected with the first driving module, the second driving module, the driving detection module and the photovoltaic inversion module, and is configured to transmit the first driving signal and the second driving signal to the upper bridge arm switch tube of the positive half cycle and the upper bridge arm switch tube of the negative half cycle of the photovoltaic inversion module respectively, transmit the second driving signal to the upper bridge arm switch tube of the negative half cycle when the first fault signal is received, and transmit the first driving signal to the upper bridge arm switch tube of the positive half cycle when the second fault signal is received.

[0010] The photovoltaic inversion module is configured to receive the first driving signal and the second driving signal transmitted by the safety driving module, and control the switching state of the upper bridge arm switch tube of the positive half cycle and the upper bridge arm switch tube of the negative half cycle, and inversely process the generated photovoltaic power.

[0011] As a further scheme of the present application, the photovoltaic inversion module comprises a photovoltaic power supply, a third power tube, a fourth power tube, a lower half cycle device and an output port.

[0012] Preferably, the first end of the photovoltaic power supply is connected with the drain of the third power tube and the drain of the fourth power tube, the source of the third power tube is connected with the first end of the output port and the first end of the lower half cycle device, the source of the fourth power tube is connected with the second end of the output port and the second end of the lower half cycle device, and the third end and the fourth end of the lower half cycle device are both connected with the second end of the photovoltaic power supply.

[0013] As a further scheme of the present application, the safety driving module comprises a first resistor, a second resistor, a first switch tube, a second switch tube, an eighth diode, a ninth diode and a first analog switch, and the micro-control module comprises a first controller.

[0014] Preferably, one end of the first resistor is connected to one end of the second resistor, the drain of the third power tube and the first end of the photovoltaic power supply, the other end of the first resistor is connected to the collector of the first switch tube and the sixth end of the first analog switch, the other end of the second resistor is connected to the collector of the second switch tube and the fifth end of the first analog switch, the emitter of the first switch tube is connected to the emitter of the second switch tube and the ground end, the second end and the fourth end of the first analog switch are both connected to the gate of the third power tube, the ninth end and the eleventh end of the first analog switch are both connected to the gate of the fourth power tube, the base of the second switch tube and the base of the first switch tube are both connected to the cathode of the eighth diode, the cathode of the ninth diode, the thirteenth end and the twelfth end of the first analog switch, and the anode of the eighth diode and the anode of the ninth diode are respectively connected to the IO4 end and the IO3 end of the first controller.

[0015] As a further scheme of the present application: the first driving module comprises a first power supply, a first power tube, a second power tube, a first thyristor and a first diode;

[0016] Preferably, the first power supply is connected to the source of the first power tube, the drain of the first power tube is connected to the drain of the second power tube, the source of the second power tube is grounded, the gate of the first power tube is connected to the gate of the second power tube, the cathode of the first diode and the anode of the first thyristor, the anode of the first diode is connected to the IO1 end of the first controller, and the control end of the first thyristor is connected to the IO3 end of the first controller.

[0017] As a further scheme of the present application: the first driving module further comprises a fifth diode, a first capacitor, a third resistor, a sixth diode, a seventh diode, a fourth resistor, a second capacitor, a first inductor and a fifth resistor;

[0018] Preferably, the cathode of the fifth diode is connected to one end of the first capacitor and the drain of the first power tube, and the other end of the first capacitor is connected to the anode of the fifth diode, the anode of the sixth diode, the cathode of the seventh diode and one end of the fifth resistor through the third resistor, the other end of the fifth resistor is connected to the third end of the first analog switch, the anode of the seventh diode is connected to one end of the second capacitor, one end of the fourth resistor, the anode of the seventh diode and the ground end through the first inductor, and the cathode of the seventh diode is connected to the cathode of the sixth diode, the other end of the fourth resistor and the other end of the second capacitor.

[0019] As a further scheme of the present application: the second driving module comprises a driving processing device, a second thyristor and a second diode;

[0020] Preferably, the input end of the driving processing device is connected with the anode of the second thyristor, the cathode of the first thyristor and the cathode of the second diode, the anode of the second diode is connected with the IO2 end of the first controller, the control end of the second thyristor is connected with the IO4 end of the first controller, the cathode of the second thyristor is connected with the gate of the second power tube, the output end of the driving processing device is connected with the first end and the eighth end of the first analog switch, and the grounding end of the driving processing device is grounded.

[0021] As a further scheme of the present application, the protection module comprises a third diode, a first comparator, a first reference power supply, a third logic device, a first inverter, a fifth power tube, a second inverter, a fourth logic device, a sixth power tube and a fourth diode.

[0022] Preferably, the anode of the third diode is connected with the drain of the fifth power tube and the gate of the third power tube, the cathode of the third diode is connected with the non-inverting end of the first comparator and the cathode of the fourth diode, the anode of the fourth diode is connected with the drain of the sixth power tube and the gate of the fourth power tube, the inverting end of the first comparator is connected with the first reference power supply, the source of the fifth power tube and the source of the sixth power tube are connected, the output end of the first comparator is connected with the B end of the third logic device and the B end of the fourth logic device, the Y end of the third logic device and the Y end of the fourth logic device are respectively connected with the gate of the fifth power tube and the gate of the sixth power tube, the A end of the third logic device and the A end of the fourth logic device are respectively connected with the output end of the first inverter and the output end of the second inverter, and the input end of the first inverter and the input end of the second inverter are respectively connected with the IO1 end and the IO2 end of the first controller.

[0023] As a further scheme of the present application, the driving detection module comprises a first logic device and a second logic device.

[0024] Preferably, the B end and the A end of the first logic device are respectively connected with the IO1 end of the first controller and the third end of the first analog switch, the A end and the B end of the second logic device are respectively connected with the IO2 end of the first controller and the first end of the first analog switch, and the Y end of the first logic device and the Y end of the second logic device are respectively connected with the IO3 end and the IO4 end of the first controller.

[0025] Compared with the prior art, the photovoltaic inverter safe driving control circuit has the advantages that the photovoltaic inverter safe driving control circuit can drive, amplify and perform crosstalk suppression processing on the pulse signals provided by the micro control module through the first driving module and the second driving module, then the safe driving module transmits the signals and drives the photovoltaic inverter module to perform inverting work, the protection module can control the upper bridge arm switch tube in the positive half cycle or the upper bridge arm switch tube in the negative half cycle of the photovoltaic inverter module which is not in the working state to keep a low potential state according to the state of the pulse signals provided by the micro control module, so as to avoid the mis-conduction, the driving detection module can detect whether the first driving module or the second driving module has driving failure, and when the first driving module has driving failure, the micro control module can maintain the work of the upper bridge arm switch tube in the positive half cycle of the photovoltaic inverter module through the second driving module and the safe driving module, and when the second driving module is abnormal, the work of the upper bridge arm switch tube in the negative half cycle of the photovoltaic inverter module is maintained, the inverting work is maintained, and the electric energy conversion efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 A principle block diagram of a photovoltaic inverter safe driving control circuit provided by the embodiments of the present application.

[0028] Figure 2 A circuit diagram of a photovoltaic inverter safe driving control circuit provided by the embodiments of the present application.

[0029] Figure 3 A circuit diagram of a first driving module provided by the embodiments of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0031] In one embodiment, please refer to Figure 1The application discloses a photovoltaic inverter safety driving control circuit, which comprises a micro control module 1, a driving detection module 4, a first driving module 2, a second driving module 3, a protection module 5 and a safety driving module 6.

[0032] The first driving module 2 is connected with the micro control module 1 and the second driving module 3, and is used for transmitting the first pulse signal to the second driving module 3 when the first fault signal is received, and driving amplifying and crosstalk suppressing the input first pulse signal or the second pulse signal transmitted by the second driving module 3 and outputting a first driving signal.

[0033] The second driving module 3 is connected with the micro control module 1, and is used for transmitting the second pulse signal to the first driving module 2 when the second fault signal is received, and driving amplifying and crosstalk suppressing the input second pulse signal or the first pulse signal transmitted by the first driving module 2 and outputting a second driving signal.

[0034] The driving detection module 4 is connected with the first driving signal and the second driving module 3, and is used for outputting a first fault signal when the first pulse signal is received and the first driving signal is not received, and outputting a second fault signal when the second pulse signal is received and the second driving signal is not received.

[0035] The protection module 5 is connected with the micro control module 1 and a photovoltaic inverter module 7, and is used for setting a voltage threshold value, and controlling the upper bridge arm switch tube of the positive half cycle to stop working when the first pulse signal is not received and the voltage of the upper bridge arm switch tube of the positive half cycle of the photovoltaic inverter module 7 is greater than the voltage threshold value, and controlling the upper bridge arm switch tube of the negative half cycle to stop working when the second pulse signal is not received and the voltage of the upper bridge arm switch tube of the negative half cycle of the photovoltaic inverter module 7 is greater than the voltage threshold value.

[0036] The safety driving module 6 is connected with the first driving module 2, the second driving module 3, the driving detection module 4 and the photovoltaic inverter module 7, and is used for transmitting the first driving signal and the second driving signal to the upper bridge arm switch tube of the positive half cycle and the upper bridge arm switch tube of the negative half cycle of the photovoltaic inverter module 7 respectively, transmitting the second driving signal to the upper bridge arm switch tube of the negative half cycle when the first fault signal is received, and transmitting the first driving signal to the upper bridge arm switch tube of the positive half cycle when the second fault signal is received.

[0037] The photovoltaic inverter module 7 is used for receiving the first driving signal and the second driving signal transmitted by the safety driving module 6, controlling the switching state of the upper bridge arm switch tube of the positive half cycle and the upper bridge arm switch tube of the negative half cycle, and inverting the generated photovoltaic power.

[0038] In specific embodiments, the micro-control module 1 can be a micro-control circuit composed of a single-chip microcomputer, which integrates an operator, a controller, a memory, an input-output device and other components to realize signal processing, data storage, module control, timing control and other functions; the first driving module 2 can be a first driving circuit composed of a field effect transistor, a thyristor, a capacitor, a diode and the like, which can drive and amplify the input pulse signal and suppress crosstalk, and control the transmission path of the signal; the second driving module 3 can be a second driving circuit composed of a thyristor, a driving processing device and a diode, which can drive and amplify the input pulse signal and suppress crosstalk, and control the transmission path of the signal; the driving detection module 4 can be a driving detection circuit composed of a logic device, which can perform logical calculation, determine the fault state of the first driving module 2 according to the pulse signal provided by the micro-control module 1 and the output state of the first driving module 2, and determine the fault state of the second driving module 3 according to the pulse signal provided by the micro-control module 1 and the output state of the second driving module 3; the protection module 5 can be a protection circuit composed of a field effect transistor, a logic device, an inverter, a comparator and the like, which can set a voltage threshold, compare the voltage of the upper bridge arm switch tube in the positive half cycle or the upper bridge arm switch tube in the negative half cycle of the photovoltaic inverter module 7 in the undriven state with the voltage of the voltage threshold; the safe driving module 6 can be a safe driving circuit composed of an analog switch, a triode and a resistor, which can control signal transmission and change the signal transmission path; the photovoltaic inverter module 7 can be a photovoltaic inverter circuit composed of a photovoltaic power supply, a field effect transistor, a lower half cycle device and an output port, which can invert the photovoltaic power.

[0039] In another embodiment, please refer to Figure 1 , Figure 2 and Figure 3 , the photovoltaic inverter module 7 includes a photovoltaic power supply, a third power tube Q3, a fourth power tube Q4, a lower half cycle device and an output port.

[0040] Specifically, the first end of the photovoltaic power supply is connected to the drain of the third power tube Q3 and the drain of the fourth power tube Q4, the source of the third power tube Q3 is connected to the first end of the output port and the first end of the lower half cycle device, the source of the fourth power tube Q4 is connected to the second end of the output port and the second end of the lower half cycle device, and the third end and the fourth end of the lower half cycle device are both connected to the second end of the photovoltaic power supply.

[0041] In specific embodiments, the photovoltaic power source can be composed of a photovoltaic panel and a DC-DC device; the third power tube Q3 and the fourth power tube Q4 can be N-channel field effect tubes, wherein the third power tube Q3 and the fourth power tube Q4 are respectively the upper bridge arm switch tube of the positive half cycle and the upper bridge arm switch tube of the negative half cycle; the lower half cycle device can be composed of two groups of N-channel field effect tubes, and is respectively the lower bridge arm switch tube of the positive half cycle and the lower bridge arm switch tube of the negative half cycle, cooperates with the third power tube Q3 and the fourth power tube Q4 to perform inverter work, and the driving mode is the same as that of the third power tube Q3 and the fourth power tube Q4.

[0042] Further, the safety driving module 6 includes a first resistor R1, a second resistor R2, a first switch tube V1, a second switch tube V2, an eighth diode D8, a ninth diode D9, and a first analog switch U2; the micro control module 1 includes a first controller U1;

[0043] Specifically, one end of the first resistor R1 is connected to one end of the second resistor R2, the drain of the third power tube Q3, and the first end of the photovoltaic power source, the other end of the first resistor R1 is connected to the collector of the first switch tube V1 and the sixth end of the first analog switch U2, the other end of the second resistor R2 is connected to the collector of the second switch tube V2 and the fifth end of the first analog switch U2, the emitter of the first switch tube V1 is connected to the emitter of the second switch tube V2 and the ground end, the second end and the fourth end of the first analog switch U2 are both connected to the gate of the third power tube Q3, the ninth end and the eleventh end of the first analog switch U2 are both connected to the gate of the fourth power tube Q4, the base of the second switch tube V2 and the base of the first switch tube V1 are both connected to the cathode of the eighth diode D8, the cathode of the ninth diode D9, the thirteenth end of the first analog switch U2, and the twelfth end, and the anode of the eighth diode D8 and the anode of the ninth diode D9 are respectively connected to the IO4 end and the IO3 end of the first controller U1.

[0044] In specific embodiments, the first analog switch U2 can be a CD4066 chip; the first switch tube V1 and the second switch tube V2 can be NPN type triodes; and the first controller U1 can be an STM32 single-chip microcomputer.

[0045] Further, the first driving module 2 includes a first power supply VCC1, a first power tube Q1, a second power tube Q2, a first silicon controlled rectifier S1, and a first diode D1;

[0046] Specifically, the first power supply VCC1 is connected to the source of the first power tube Q1, the drain of the first power tube Q1 is connected to the drain of the second power tube Q2, the source of the second power tube Q2 is grounded, the gate of the first power tube Q1 is connected to the gate of the second power tube Q2, the cathode of the first diode D1 and the anode of the first thyristor S1, the anode of the first diode D1 is connected to the IO1 terminal of the first controller U1, and the control terminal of the first thyristor S1 is connected to the IO3 terminal of the first controller U1.

[0047] In specific embodiments, the first power tube Q1 and the second power tube Q2 can be N-channel field effect tubes.

[0048] Further, the first driving module 2 further comprises a fifth diode D5, a first capacitor C1, a third resistor R3, a sixth diode D6, a seventh diode D7, a fourth resistor R4, a second capacitor C2, a first inductor L1 and a fifth resistor R5.

[0049] Specifically, the cathode of the fifth diode D5 is connected to one end of the first capacitor C1 and the drain of the first power tube Q1, and the other end of the first capacitor C1 is connected to the third resistor R3, the anode of the fifth diode D5, the anode of the sixth diode D6, the cathode of the seventh diode D7 and one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to the third terminal of the first analog switch U2, the anode of the seventh diode D7 is connected to one end of the second capacitor C2, one end of the fourth resistor R4, the anode of the seventh diode D7 and the ground terminal through the first inductor L1, the cathode of the seventh diode D7 is connected to the cathode of the sixth diode D6, the other end of the fourth resistor R4 and the other end of the second capacitor C2.

[0050] In specific embodiments, the first capacitor C1 can be an energy storage capacitor, which can provide sufficient negative voltage when the third power tube Q3 is turned off, thereby accelerating the turn-off rate, and cooperating with the seventh diode D7, the first inductor L1, the sixth diode D6, the seventh diode D7, the fourth resistor R4 and the second capacitor C2 to perform crosstalk suppression processing.

[0051] Further, the second driving module 3 comprises a driving processing device, a second thyristor S2 and a second diode D2.

[0052] Specifically, the input terminal of the driving processing device is connected to the anode of the second thyristor S2, the cathode of the first thyristor S1 and the cathode of the second diode D2, the anode of the second diode D2 is connected to the IO2 terminal of the first controller U1, the control terminal of the second thyristor S2 is connected to the IO4 terminal of the first controller U1, the cathode of the second thyristor S2 is connected to the gate of the second power tube Q2, the output terminal of the driving processing device is connected to the first terminal and the eighth terminal of the first analog switch U2, and the ground terminal of the driving processing device is grounded.

[0053] In specific embodiments, the circuit composition structure of the driving processing device is the same as that of the first power supply VCC1, the first power tube Q1, the second power tube Q2, the fifth diode D5, the first capacitor C1, the third resistor R3, the sixth diode D6, the seventh diode D7, the fourth resistor R4, the second capacitor C2, the first inductor L1, the seventh diode D7, and the fifth resistor R5; the second thyristor S2 can be a unidirectional thyristor.

[0054] Further, the protection module 5 includes a third diode D3, a first comparator A1, a first reference power supply VREF, a third logic J3, a first inverter INV1, a fifth power tube Q5, a second inverter INV2, a fourth logic J4, a sixth power tube Q6, and a fourth diode D4.

[0055] Specifically, the anode of the third diode D3 is connected to the drain of the fifth power tube Q5 and the gate of the third power tube Q3, the cathode of the third diode D3 is connected to the non-inverting terminal of the first comparator A1 and the cathode of the fourth diode D4, the anode of the fourth diode D4 is connected to the drain of the sixth power tube Q6 and the gate of the fourth power tube Q4, the inverting terminal of the first comparator A1 is connected to the first reference power supply VREF, the source of the fifth power tube Q5 and the source of the sixth power tube Q6 are connected, the output terminal of the first comparator A1 is connected to the B terminal of the third logic J3 and the B terminal of the fourth logic J4, the Y terminal of the third logic J3 and the Y terminal of the fourth logic J4 are respectively connected to the gate of the fifth power tube Q5 and the gate of the sixth power tube Q6, the A terminal of the third logic J3 and the A terminal of the fourth logic J4 are respectively connected to the output terminal of the first inverter INV1 and the output terminal of the second inverter INV2, the input terminal of the first inverter INV1 and the input terminal of the second inverter INV2 are respectively connected to the IO1 terminal and the IO2 terminal of the first controller U1.

[0056] In specific embodiments, the first reference power supply VREF can provide a voltage threshold, which is lower than the gate voltage of the third power tube Q3; the first comparator A1 can be an LM358 comparator; the third logic J3 and the fourth logic J4 can both be AND gate chips, and the first inverter INV1 and the second inverter INV2 can both be NOT gate chips; the fifth power tube Q5 and the sixth power tube Q6 can both be N-channel field effect tubes.

[0057] Further, the driving detection module 4 includes a first logic J1 and a second logic J2.

[0058] Specifically, the B terminal and the A terminal of the first logic J1 are connected to the IO1 terminal of the first controller U1 and the third terminal of the first analog switch U2 respectively, the A terminal and the B terminal of the second logic J2 are connected to the IO2 terminal of the first controller U1 and the first terminal of the first analog switch U2 respectively, and the Y terminal of the first logic J1 and the Y terminal of the second logic J2 are connected to the IO3 terminal and the IO4 terminal of the first controller U1 respectively.

[0059] In a specific embodiment, the first logic J1 and the second logic J2 can be selected as XOR gate chips.

[0060] In the safety driving control circuit of the photovoltaic inverter, the photovoltaic power supply generates photovoltaic power and performs DC-DC adjustment processing. The output power triggers the fourth terminal and the third terminal of the first analog switch U2 to conduct through the first resistor R1 and the second resistor R2. The eighth terminal and the ninth terminal of the first analog switch U2 are turned on. The IO1 terminal of the first controller U1 outputs the first pulse signal. After transmission through the first diode D1, amplification by the first power supply VCC1, the first power tube Q1, and the second power tube Q2, and filtering and crosstalk suppression processing by the first capacitor C1, the fifth diode D5, the third resistor R3, the sixth diode D6, the seventh diode D7, the fourth capacitor, the second capacitor C2, the first inductor L1, the seventh diode D7, and the fifth resistor R5, the first analog switch U2 transmits and triggers the conduction state of the third power tube Q3. At the same time, the lower bridge arm switch tube of the negative half cycle of the lower half cycle device also enters the working state to supply power to the output port. At this time, the IO2 terminal of the first controller U1 does not work. When the gate voltage of the fourth power tube Q4 is greater than the voltage threshold, the fourth logic J4 controls the sixth power tube Q6 to conduct, and the gate potential of the fourth power tube Q4 is pulled down to avoid the false conduction of the fourth power tube Q4 due to voltage drift. Similarly, after the second pulse signal is output from the IO2 terminal of the first controller U1, the signal is transmitted by the second diode D2, amplified and crosstalk suppressed by the driving processing device, and the fourth power tube Q4 is triggered to conduct by the first analog switch U2. At the same time, the lower bridge arm switch tube of the positive half cycle of the lower half cycle device also enters the working state to supply power to the output port, complete the inverter work, and at this time, when the gate voltage of the third power tube Q3 is greater than the voltage threshold, the third logic J3 controls the fifth power tube Q5 to conduct, and the gate potential of the third power tube Q3 is pulled down. When the first controller U1 provides the first pulse signal at the IO1 terminal, but the third power tube Q3 does not receive the processed signal, the first logic J1 outputs a high-level signal, i.e., a first fault signal, indicating that the third power tube Q3 is abnormally driven, triggering the first thyristor S1, the first switch V1, and the second switch V2 to conduct. The first analog switch U2 switches the conduction path, so that the first pulse signal is driven by the driving processing device, and then the third power tube Q3 is triggered to conduct by the first analog switch U2. Similarly, when the first controller U1 provides the second pulse signal at the IO2 terminal, but the fourth power tube Q4 does not receive the processed signal, the second logic J2 triggers the second thyristor S2, the first switch V1, and the second switch V2 to conduct. The first analog switch U2 switches the signal transmission path, so that the second pulse signal is processed by the first driving module 2, and then the fourth power tube Q4 is triggered to conduct by the first analog switch U2, maintaining the normal operation of the inverter. Similarly, the driving protection scheme can also be completed for the lower half cycle device. When the driving of the third power tube Q3 and the fourth power tube Q4 both appears abnormal, the first controller U1 will stop the inverter work.

[0061] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims to the identity of the reference signs therein.

[0062] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and 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 those skilled in the art can understand.

Claims

1. A photovoltaic inverter safety drive control circuit, characterized by, The circuit comprises: The micro-control module is connected with the drive detection module, and is used for providing the first pulse signal and the second pulse signal, and stopping working when the first fault signal and the second fault signal output by the drive detection module are received; The first drive module is connected with the micro-control module and the second drive module, and is used for transmitting the first pulse signal to the second drive module when the first fault signal is received, and driving amplifying and crosstalk suppressing the input first pulse signal or the second pulse signal transmitted by the second drive module and outputting the first drive signal; The second drive module is connected with the micro-control module, and is used for transmitting the second pulse signal to the first drive module when the second fault signal is received, and driving amplifying and crosstalk suppressing the input second pulse signal or the first pulse signal transmitted by the first drive module and outputting the second drive signal; The drive detection module is connected with the first drive signal and the second drive module, and is used for outputting the first fault signal when the first pulse signal is received and the first drive signal is not received, and outputting the second fault signal when the second pulse signal is received and the second drive signal is not received; The protection module is connected with the micro-control module and the photovoltaic inversion module, and is used for setting a voltage threshold value, and controlling the upper bridge arm switch tube of the positive half cycle to stop working when the first pulse signal is not received and the voltage of the upper bridge arm switch tube of the positive half cycle of the photovoltaic inversion module is greater than the voltage threshold value, and controlling the upper bridge arm switch tube of the negative half cycle to stop working when the second pulse signal is not received and the voltage of the upper bridge arm switch tube of the negative half cycle of the photovoltaic inversion module is greater than the voltage threshold value; The safety drive module is connected with the first drive module, the second drive module, the drive detection module and the photovoltaic inversion module, and is used for transmitting the first drive signal and the second drive signal to the upper bridge arm switch tube of the positive half cycle and the upper bridge arm switch tube of the negative half cycle of the photovoltaic inversion module respectively, transmitting the second drive signal to the upper bridge arm switch tube of the negative half cycle when the first fault signal is received, and transmitting the first drive signal to the upper bridge arm switch tube of the positive half cycle when the second fault signal is received; The photovoltaic inversion module is used for receiving the first drive signal and the second drive signal transmitted by the safety drive module, controlling the switching state of the upper bridge arm switch tube of the positive half cycle and the upper bridge arm switch tube of the negative half cycle, and inverting the generated photovoltaic power.

2. A photovoltaic inverter safety drive control circuit according to claim 1, wherein, The photovoltaic inversion module comprises a photovoltaic power supply, a third power tube, a fourth power tube, a lower half cycle device and an output port; The first end of the photovoltaic power supply is connected with the drain of the third power tube and the drain of the fourth power tube, the source of the third power tube is connected with the first end of the output port and the first end of the lower half cycle device, the source of the fourth power tube is connected with the second end of the output port and the second end of the lower half cycle device, and the third end and the fourth end of the lower half cycle device are both connected with the second end of the photovoltaic power supply.

3. A photovoltaic inverter safety drive control circuit according to claim 2, wherein, The safety drive module comprises a first resistor, a second resistor, a first switch tube, a second switch tube, an eighth diode, a ninth diode and a first analog switch, and the micro-control module comprises a first controller. One end of the first resistor is connected to one end of the second resistor, the drain of the third power tube and the first end of the photovoltaic power supply, the other end of the first resistor is connected to the collector of the first switch tube and the sixth end of the first analog switch, the other end of the second resistor is connected to the collector of the second switch tube and the fifth end of the first analog switch, the emitter of the first switch tube is connected to the emitter of the second switch tube and the ground end, the second end and the fourth end of the first analog switch are both connected to the gate of the third power tube, the ninth end and the eleventh end of the first analog switch are both connected to the gate of the fourth power tube, the base of the second switch tube and the base of the first switch tube are both connected to the cathode of the eighth diode, the cathode of the ninth diode, the thirteenth end and the twelfth end of the first analog switch, the anode of the eighth diode and the anode of the ninth diode are respectively connected to the IO4 end and the IO3 end of the first controller.

4. A photovoltaic inverter safety drive control circuit according to claim 3, wherein, The first driving module comprises a first power supply, a first power tube, a second power tube, a first thyristor and a first diode. The first power supply is connected to the source of the first power tube, the drain of the first power tube is connected to the drain of the second power tube, the source of the second power tube is grounded, the gate of the first power tube is connected to the gate of the second power tube, the cathode of the first diode and the anode of the first thyristor, the anode of the first diode is connected to the IO1 end of the first controller, and the control end of the first thyristor is connected to the IO3 end of the first controller.

5. A photovoltaic inverter safety drive control circuit according to claim 4, wherein, The first driving module further comprises a fifth diode, a first capacitor, a third resistor, a sixth diode, a seventh diode, a fourth resistor, a second capacitor, a first inductor and a fifth resistor. The cathode of the fifth diode is connected to one end of the first capacitor and the drain of the first power tube and connected to the other end of the first capacitor, the anode of the fifth diode, the anode of the sixth diode, the cathode of the seventh diode and one end of the fifth resistor through the third resistor, the other end of the fifth resistor is connected to the third end of the first analog switch, the anode of the seventh diode is connected to one end of the second capacitor, one end of the fourth resistor, the anode of the seventh diode and the ground end through the first inductor, and the cathode of the seventh diode is connected to the cathode of the sixth diode, the other end of the fourth resistor and the other end of the second capacitor.

6. A photovoltaic inverter safety drive control circuit according to claim 5, wherein, The second driving module comprises a driving processing device, a second thyristor and a second diode. The input end of the driving processing device is connected to the anode of the second thyristor, the cathode of the first thyristor and the cathode of the second diode, the anode of the second diode is connected to the IO2 end of the first controller, the control end of the second thyristor is connected to the IO4 end of the first controller, the cathode of the second thyristor is connected to the gate of the second power tube, the output end of the driving processing device is connected to the first end and the eighth end of the first analog switch, and the ground end of the driving processing device is grounded.

7. A photovoltaic inverter safety drive control circuit according to claim 6, wherein, The protection module comprises a third diode, a first comparator, a first reference power supply, a third logic device, a first inverter, a fifth power tube, a second inverter, a fourth logic device, a sixth power tube and a fourth diode. An anode of the third diode is connected with a drain of a fifth power tube and a gate of a third power tube, a cathode of the third diode is connected with a non-inverting terminal of a first comparator and a cathode of a fourth diode, an anode of the fourth diode is connected with a drain of a sixth power tube and a gate of a fourth power tube, a non-inverting terminal of the first comparator is connected with a first reference power supply, a source of the fifth power tube and a source of the sixth power tube are connected with each other, an output terminal of the first comparator is connected with a B terminal of a third logic device and a B terminal of a fourth logic device, a Y terminal of the third logic device and a Y terminal of the fourth logic device are connected with a gate of the fifth power tube and a gate of the sixth power tube respectively, an A terminal of the third logic device and an A terminal of the fourth logic device are connected with an output terminal of a first inverter and an output terminal of a second inverter respectively, an input terminal of the first inverter and an input terminal of the second inverter are connected with IO1 terminal and IO2 terminal of the first controller respectively.

8. A photovoltaic inverter safety drive control circuit according to claim 7, wherein, The driving detection module comprises a first logic device and a second logic device; A B terminal and an A terminal of the first logic device are connected with IO1 terminal of the first controller and a third terminal of the first analog switch respectively, an A terminal and a B terminal of the second logic device are connected with IO2 terminal of the first controller and a first terminal of the first analog switch respectively, a Y terminal of the first logic device and a Y terminal of the second logic device are connected with IO3 terminal and IO4 terminal of the first controller respectively.

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