Flexible AC / DC power transmission and distribution safety detection circuit

Abstract

The invention discloses a flexible AC / DC power transmission and distribution safety detection circuit, and relates to the technical field of AC / DC detection, and the circuit comprises a DC power grid module which is used for providing and receiving DC electric energy; the micro-control module is used for signal receiving and module control; the bidirectional conversion module is used for inversion and rectification processing; the alternating-current power grid module is used for providing and receiving alternating-current electric energy; the detection trigger module is used for transmitting a signal sampled by the second detection module during inversion and transmitting a signal detected by the first detection module during rectification; the first detection module is used for detecting the electric energy output after rectification; the second detection module is used for detecting the electric energy output after inversion; the positive electrode processing module and the negative electrode processing module are used for processing input signals; and the protection control module is used for judging faults and controlling the bidirectional conversion module to stop working. According to the flexible AC / DC power transmission and distribution safety detection circuit, power distribution detection on the AC side and the DC side is automatically realized, and the power distribution safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of AC and DC detection, in particular to a flexible AC and DC power transmission and distribution safety detection circuit. Background Art

[0002] Flexible AC / DC power transmission and distribution systems mainly include flexible AC transmission technology and flexible DC transmission technology, which realize power conversion control between DC power grid and AC power grid and enhance the stability of AC power grid and DC power grid. To ensure safe conversion control between DC power grid and AC power grid, flexible AC / DC power transmission and distribution systems in the prior art generally use power transmission and distribution safety detection circuits on both the DC side and the AC side of the converter to perform power distribution safety detection on the DC side and the AC side of the converter to avoid abnormal power on the DC side or the AC side due to abnormal converter. However, the power transmission and distribution safety detection circuit cannot automatically select the detection of the DC side or the AC side according to the working state of the converter, and the use of power transmission and distribution safety detection circuits on both the DC side and the AC side increases the detection cost, so it needs to be improved. Summary of the invention

[0003] The embodiment of the present invention provides a flexible AC / DC power transmission and distribution safety detection circuit to solve the problems raised in the above background technology.

[0004] According to an embodiment of the present invention, a flexible AC / DC power transmission and distribution safety detection circuit is provided, comprising: a DC power grid module, a microcontroller module, a bidirectional conversion module, an AC power grid module, a detection trigger module, a first detection module, a second detection module, a positive electrode processing module, a negative electrode processing module and a protection control module;

[0005] A DC power grid module, connected to the bidirectional conversion module, configured to provide a first DC power and receive a second DC power output by the bidirectional conversion module;

[0006] A microcontroller module is connected to the bidirectional conversion module, the positive electrode processing module and the negative electrode processing module, and is used to output a first pulse signal and control the bidirectional conversion module to perform an inversion operation, output a second pulse signal and control the bidirectional conversion module to perform a rectification operation, and receive a first processing signal output by the positive electrode processing module and a second processing signal output by the negative electrode processing module;

[0007] A bidirectional conversion module is connected to the AC power grid module and is used to invert the first DC power and output the second AC power when receiving the first pulse signal, and rectify the first AC power output by the AC power grid module and output the second DC power when receiving the second pulse signal;

[0008] an AC power grid module, configured to provide a first AC power and receive a second AC power;

[0009] A detection trigger module, connected to the microcontroller module, configured to perform isolation transmission processing on the first pulse signal and output a first trigger signal, and perform isolation transmission processing on the second pulse signal and output a second trigger signal;

[0010] A first detection module, connected to the detection trigger module and the bidirectional conversion module, for performing positive detection on the AC component in the second DC power and outputting a first detection signal, and performing negative detection on the AC component in the second DC power and outputting a second detection signal upon receiving a second trigger signal;

[0011] A second detection module, connected to the detection trigger module and the bidirectional conversion module, for performing positive detection on the second AC power and outputting a third detection signal, and performing negative detection on the second AC power and outputting a fourth detection signal upon receiving the first trigger signal;

[0012] A positive electrode processing module, connected to the first detection module and the second detection module, for performing isolation transformation, filtering and signal amplification processing on the first detection signal or the third detection signal and outputting a first processing signal;

[0013] a negative electrode processing module connected to the first detection module and the second detection module, and configured to perform isolation transformation, filtering and signal amplification processing on the second detection signal or the fourth detection signal and output a second processing signal, and perform inversion processing on the second processing signal and output a third processing signal;

[0014] The protection control module is connected to the detection trigger module, the positive electrode processing module, the negative electrode processing module and the microcontrol module, and is used to control the microcontrol module to stop outputting the second pulse signal when the first trigger signal and the first processing signal or the third processing signal are received, and to control the microcontrol module to stop outputting the first pulse signal when the second trigger signal is received and the first processing signal or the third processing signal is not received.

[0015] As a further solution of the present invention: the DC grid module includes a DC grid terminal and a first capacitor; the bidirectional conversion module includes a first converter; the AC grid module includes an AC grid terminal; the microcontroller module includes a first controller;

[0016] Preferably, the first end of the DC grid end is connected to the first end of the first capacitor and the first end of the first converter, the second end of the DC grid end is connected to the second end of the first capacitor and the second end of the first converter, the third end of the first converter is connected to the first end of the AC grid end, the fourth end of the first converter is connected to the end of the AC grid end, the rectifier control end of the first converter is connected to the IO3 end of the first controller, and the inverter control end of the first converter is connected to the IO4 end of the first controller.

[0017] As a further solution of the present invention: the first detection module includes a first diode, a second capacitor, a first resistor, a second resistor, a third resistor, a first thyristor, a second thyristor, a third thyristor, a fourth thyristor, a fourth resistor, a fifth resistor, a sixth resistor, a third capacitor and a second diode;

[0018] Preferably, the anode of the first diode is connected to the first end of the DC grid terminal, the cathode of the first diode is connected to one end of the first resistor and one end of the second resistor through the second capacitor, the other end of the second resistor is connected to the first end of the first thyristor, the first end of the second thyristor is connected to the other end of the first resistor, one end of the fifth resistor, one end of the fourth resistor and the ground through the third resistor, the second end of the first thyristor and the control end of the second thyristor are connected to the positive electrode processing module, the other end of the fifth resistor is connected to the first end of the third thyristor, the first end of the fourth thyristor is connected to the other end of the fourth resistor and one end of the third capacitor through the sixth capacitor, the other end of the third capacitor is connected to the anode of the second diode, the cathode of the second diode is connected to the second end of the DC grid terminal, the control end of the first thyristor is connected to the control end of the second thyristor, the control end of the third thyristor, the control end of the fourth thyristor and the detection trigger module, and the second end of the third thyristor and the second end of the fourth thyristor are connected to the negative electrode processing module.

[0019] As a further solution of the present invention: the positive electrode processing module includes a first mutual inductor, a third diode, a fourth diode, a fourth capacitor, a seventh resistor, a fifth capacitor, a first operational amplifier and an eighth resistor;

[0020] Preferably, the first end and the second end of the first mutual inductor are respectively connected to the second end of the first thyristor and the second end of the second thyristor, the third end of the first mutual inductor is connected to the cathode of the third diode, the anode of the fourth diode, one end of the fifth capacitor, one end of the seventh resistor and the in-phase end of the first op amp, and the inverting end of the first op amp, the cathode of the fourth diode, the anode of the third diode and the fourth end of the first mutual inductor are connected through the fourth capacitor, the output end of the first op amp is connected to the other end of the seventh resistor, the other end of the fifth capacitor and the first end of the eighth resistor, and the second end of the eighth resistor is connected to the IO1 end of the first controller.

[0021] As a further solution of the present invention: the negative electrode processing module includes a signal processing device and a first inverter;

[0022] Preferably, the first input terminal and the second input terminal of the signal processing device are respectively connected to the second terminal of the third thyristor and the second terminal of the fourth thyristor, the output terminal of the signal processing device is connected to the input terminal of the first inverter and the IO2 terminal of the first controller, and the output terminal of the first inverter is connected to the protection control module.

[0023] As a further solution of the present invention: the second detection module includes a positive electrode detection device and a negative electrode detection device;

[0024] Preferably, the input end of the positive pole detection device and the input end of the negative pole detection device are respectively connected to the third end and the fourth end of the first converter, the first output end and the second output end of the positive pole detection device are respectively connected to the first end and the second end of the first mutual inductor, the first output end and the second output end of the negative pole detection device are respectively connected to the first input end and the second input end of the signal processing device, the ground end of the positive pole detection device and the ground end of the negative pole detection device are both grounded, and the control end of the positive pole detection device is connected to the control end of the negative pole detection device and the detection trigger module.

[0025] As a further solution of the present invention: the detection trigger module includes a seventh diode, a sixth capacitor, a first optical coupler, a first power supply, a ninth resistor, a seventh capacitor and a tenth resistor;

[0026] Preferably, the anode of the seventh diode is connected to the IO3 terminal of the first controller, the cathode of the seventh diode is connected to the first end of the first optocoupler and is connected to the second end of the first optocoupler and the ground through the sixth capacitor, the third end of the first optocoupler is connected to the first power supply, the fourth end of the first optocoupler is connected to the first end of the tenth resistor and one end of the ninth resistor and is connected to the other end of the ninth resistor and the ground through the seventh capacitor, and the second end of the tenth resistor is connected to the control end of the fourth thyristor and the protection control module.

[0027] As a further solution of the present invention: the detection trigger module also includes a signal transmission device;

[0028] Preferably, the input end of the signal transmission device is connected to the IO4 end of the first controller, and the output end of the signal transmission device is connected to the control end of the negative electrode detection device and the protection control module.

[0029] As a further solution of the present invention: the protection control module includes a fifth diode, a sixth diode, a first logic chip and a first switch tube;

[0030] Preferably, the anode of the fifth diode is connected to the second end of the eighth resistor, the cathode of the sixth diode is connected to the output end of the first inverter, the cathode of the fifth diode is connected to the cathode of the sixth diode and the A end of the first logic chip, the B end of the first logic chip is connected to the second end of the tenth resistor, the Y end of the first logic chip is connected to the base of the first switching tube, the emitter of the first switching tube is grounded, and the collector of the first switching tube is connected to the IO3 end of the first controller.

[0031] As a further solution of the present invention: the protection control module further includes a second logic chip and a second switch tube;

[0032] Preferably, the A end and the B end of the second logic chip are respectively connected to the cathode of the sixth diode and the output end of the signal transmission device, the Y end of the second logic chip is connected to the base of the second switch tube, the emitter of the second switch tube is grounded, and the collector of the second switch tube is connected to the IO4 end of the first controller.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows: the flexible AC / DC power transmission and distribution safety detection circuit of the present invention can control the rectification and inversion work of the bidirectional conversion module through the microcontroller module, control the AC power grid module and the DC power grid module to exchange power, and at the same time, during the rectification work, the power rectified by the bidirectional conversion module detected by the first detection module is transmitted to the positive electrode processing module and the negative electrode processing module through the detection trigger module, and then detects whether there is an AC component in the rectified DC power, and when there is an AC component, the protection control module controls the bidirectional conversion module to stop the rectification work, and during the inversion work, the detection trigger module automatically transmits the power inverted by the bidirectional conversion module detected by the second detection module to the positive electrode processing module and the negative electrode processing module, and then determines whether the bidirectional conversion module performs the inversion work normally, and when the inversion work is not performed, the protection control module controls the bidirectional conversion module to stop the inversion work, automatically realizes the power distribution detection on the AC side and the DC side, and improves the power distribution safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0035] Figure 1 A schematic block diagram of a flexible AC / DC power transmission and distribution safety detection circuit provided in an embodiment of the present invention.

[0036] Figure 2 A circuit diagram of a flexible AC / DC power transmission and distribution safety detection circuit provided in an embodiment of the present invention.

[0037] Figure 3 A circuit diagram of a negative electrode processing module provided in an embodiment of the present invention.

[0038] Figure 4 A first circuit diagram of a detection trigger module provided in an embodiment of the present invention.

[0039] Figure 5 A second circuit diagram of the detection trigger module provided in an embodiment of the present invention.

[0040] Figure 6 This is a first circuit diagram of a protection control module provided in an embodiment of the present invention.

[0041] Figure 7 A second circuit diagram of the protection control module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In one embodiment, see Figure 1 , a flexible AC / DC power transmission and distribution safety detection circuit, comprising: a DC grid module 1, a microcontroller module 2, a bidirectional conversion module 3, an AC grid module 4, a detection trigger module 5, a first detection module 6, a second detection module 7, a positive electrode processing module 8, a negative electrode processing module 9 and a protection control module 10;

[0044] Specifically, the DC grid module 1 is connected to the bidirectional conversion module 3, and is used to provide a first DC power and receive a second DC power output by the bidirectional conversion module 3;

[0045] The microcontroller module 2 is connected to the bidirectional conversion module 3, the positive electrode processing module 8 and the negative electrode processing module 9, and is used to output a first pulse signal and control the bidirectional conversion module 3 to perform an inversion operation, output a second pulse signal and control the bidirectional conversion module 3 to perform a rectification operation, and receive a first processing signal output by the positive electrode processing module 8 and a second processing signal output by the negative electrode processing module 9;

[0046] The bidirectional conversion module 3 is connected to the AC power grid module 4 and is used to invert the first DC power and output the second AC power when receiving the first pulse signal, and rectify the first AC power output by the AC power grid module 4 and output the second DC power when receiving the second pulse signal;

[0047] The AC power grid module 4 is used to provide the first AC power and receive the second AC power;

[0048] A detection trigger module 5, connected to the microcontroller module 2, for performing isolation transmission processing on the first pulse signal and outputting a first trigger signal, and performing isolation transmission processing on the second pulse signal and outputting a second trigger signal;

[0049] A first detection module 6, connected to the detection trigger module 5 and the bidirectional conversion module 3, is used to perform positive detection on the AC component in the second DC power and output a first detection signal, and perform negative detection on the AC component in the second DC power and output a second detection signal when receiving a second trigger signal;

[0050] The second detection module 7 is connected to the detection trigger module 5 and the bidirectional conversion module 3, and is used to perform positive detection on the second AC power and output a third detection signal, and perform negative detection on the second AC power and output a fourth detection signal when receiving the first trigger signal;

[0051] A positive electrode processing module 8, connected to the first detection module 6 and the second detection module 7, for performing isolation transformation, filtering and signal amplification processing on the first detection signal or the third detection signal and outputting a first processing signal;

[0052] A negative electrode processing module 9, connected to the first detection module 6 and the second detection module 7, for performing isolation transformation, filtering and signal amplification processing on the second detection signal or the fourth detection signal and outputting a second processing signal, and performing inversion processing on the second processing signal and outputting a third processing signal;

[0053] The protection control module 10 is connected to the detection trigger module 5, the positive electrode processing module 8, the negative electrode processing module 9 and the microcontrol module 2, and is used to control the microcontrol module 2 to stop outputting the second pulse signal when the first trigger signal and the first processing signal or the third processing signal are received, and to control the microcontrol module 2 to stop outputting the first pulse signal when the second trigger signal is received and the first processing signal or the third processing signal is not received.

[0054] In a specific embodiment, the DC power grid module 1 can adopt a DC power grid circuit composed of a DC power grid terminal and a capacitor, which can provide DC power and also receive the power output by the bidirectional conversion module 3; the micro-control module 2 can adopt a micro-control circuit composed of a single-chip microcomputer, which integrates many components such as an operator, a controller, a memory, and an input and output device to realize signal processing, data storage, module control, timing control and other functions; the bidirectional conversion module 3 can adopt a bidirectional conversion circuit composed of a bidirectional converter to perform single-phase rectification and inversion processing; the AC power grid module 4 can adopt an AC power grid circuit composed of an AC power grid terminal, which can provide A-type power and also receive the power output by the bidirectional conversion module 3; the detection trigger module 5 can adopt a detection trigger circuit composed of a photoelectric coupler, a capacitor, a resistor, etc., to isolate and transmit the signal output by the micro-control module 2, and trigger the power transmission of the first detection module 6 and the second detection module 7; the first detection module 6 A first detection circuit composed of a capacitor, a resistor and a diode can be used to detect the positive and negative electric energies output by the bidirectional conversion module 3 after rectification; the second detection module 7 can use a second detection circuit composed of a positive detection device and a negative detection device to detect the positive and negative electric energies output by the bidirectional conversion module 3 after inversion; the positive processing module 8 can use a positive processing circuit composed of a mutual inductor, a diode, an operational amplifier, etc. to isolate and sample, filter and amplify the input signal; the negative processing module 9 can use a negative processing circuit composed of a mutual inductor, a diode, an operational amplifier, etc. to isolate and sample, filter, amplify and invert the input signal; the protection control module 10 can use a protection control circuit composed of a logic chip, a diode and a transistor, etc., and can judge whether the bidirectional conversion module 3 is abnormal according to the high level state and the low level state of the input signal, and stop the inversion or rectification work when it is abnormal.

[0055] In another embodiment, see Figure 1 , Figure 2 and Figure 3 The DC power grid module 1 includes a DC power grid terminal and a first capacitor C1; the bidirectional conversion module 3 includes a first converter T1; the AC power grid module 4 includes an AC power grid terminal; the micro control module 2 includes a first controller U1;

[0056] Specifically, the first end of the DC grid end is connected to the first end of the first capacitor C1 and the first end of the first converter T1, the second end of the DC grid end is connected to the second end of the first capacitor C1 and the second end of the first converter T1, the third end of the first converter T1 is connected to the first end of the AC grid end, the fourth end of the first converter T1 is connected to the end of the AC grid end, the rectifier control end of the first converter T1 is connected to the IO3 end of the first controller U1, and the inverter control end of the first converter T1 is connected to the IO4 end of the first controller U1.

[0057] In a specific embodiment, the first converter T1 may be composed of four groups of IGBTs and four groups of single-phase thyristors, wherein the four groups of IGBTs perform inversion and the four groups of single-phase thyristors perform thyristor rectification; the first controller U1 may be a STM32 microcontroller.

[0058] Further, the first detection module 6 includes a first diode D1, a second capacitor C2, a first resistor R1, a second resistor R2, a third resistor R3, a first thyristor S1, a second thyristor S2, a third thyristor S3, a fourth thyristor S4, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a third capacitor C3 and a second diode D2;

[0059] Specifically, the anode of the first diode D1 is connected to the first end of the DC power grid terminal, the cathode of the first diode D1 is connected to one end of the first resistor R1 and one end of the second resistor R2 through the second capacitor C2, the other end of the second resistor R2 is connected to the first end of the first thyristor S1, the first end of the second thyristor S2 is connected to the other end of the first resistor R1, one end of the fifth resistor R5, one end of the fourth resistor R4 and the ground through the third resistor R3, the second end of the first thyristor S1 and the control end of the second thyristor S2 are connected to the positive electrode processing module 8, the other end of the fifth resistor R5 is connected to the positive electrode processing module 8, and the other end of the fifth resistor R5 is connected to the positive electrode processing module 8. The first end of the third thyristor S3 is connected, the first end of the fourth thyristor S4 is connected to the other end of the fourth resistor R4 and one end of the third capacitor C3 through the sixth capacitor C6, the other end of the third capacitor C3 is connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to the second end of the DC power grid, the control end of the first thyristor S1 is connected to the control end of the second thyristor S2, the control end of the third thyristor S3, the control end of the fourth thyristor S4 and the detection trigger module 5, and the second end of the third thyristor S3 and the second end of the fourth thyristor S4 are connected to the negative electrode processing module 9.

[0060] In a specific embodiment, the first diode D1, the second capacitor C2, the first resistor R1, the second resistor R2 and the third resistor R3 detect the input positive electric energy; the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the third capacitor C3 and the second diode D2 detect the input negative electric energy; the first thyristor S1, the second thyristor S2, the third thyristor S3 and the fourth thyristor S4 can all be bidirectional thyristors.

[0061] Further, the positive electrode processing module 8 includes a first mutual inductor B1, a third diode D3, a fourth diode D4, a fourth capacitor C4, a seventh resistor R7, a fifth capacitor C5, a first operational amplifier OP1 and an eighth resistor R8;

[0062] Specifically, the first end and the second end of the first mutual inductor B1 are respectively connected to the second end of the first thyristor S1 and the second end of the second thyristor S2, the third end of the first mutual inductor B1 is connected to the cathode of the third diode D3, the anode of the fourth diode D4, one end of the fifth capacitor C5, one end of the seventh resistor R7 and the in-phase end of the first operational amplifier OP1, and the inverting end of the first operational amplifier OP1, the cathode of the fourth diode D4, the anode of the third diode D3 and the fourth end of the first mutual inductor B1 are connected through the fourth capacitor C4, the output end of the first operational amplifier OP1 is connected to the other end of the seventh resistor R7, the other end of the fifth capacitor C5 and the first end of the eighth resistor R8, and the second end of the eighth resistor R8 is connected to the IO1 end of the first controller U1.

[0063] In a specific embodiment, the first transformer B1 may be a current transformer; the first operational amplifier OP1 may be an OP07 operational amplifier.

[0064] Further, the negative electrode processing module 9 includes a signal processing device and a first inverter INV1;

[0065] Specifically, the first input terminal and the second input terminal of the signal processing device are respectively connected to the second terminal of the third thyristor S3 and the second terminal of the fourth thyristor S4, the output terminal of the signal processing device is connected to the input terminal of the first inverter INV1 and the IO2 terminal of the first controller U1, and the output terminal of the first inverter INV1 is connected to the protection control module 10.

[0066] In a specific embodiment, the circuit composition structure of the above-mentioned signal processing device is the same as the circuit composition structure of the above-mentioned first mutual inductor B1, third diode D3, fourth diode D4, fourth capacitor C4, seventh resistor R7, fifth capacitor C5, first operational amplifier OP1 and eighth resistor R8; the above-mentioned first inverter INV1 can select a NOT gate chip.

[0067] Further, the second detection module 7 includes a positive electrode detection device and a negative electrode detection device;

[0068] Specifically, the input end of the positive pole detection device and the input end of the negative pole detection device are respectively connected to the third end and the fourth end of the first converter T1, the first output end and the second output end of the positive pole detection device are respectively connected to the first end and the second end of the first mutual inductor B1, the first output end and the second output end of the negative pole detection device are respectively connected to the first input end and the second input end of the signal processing device, the ground end of the positive pole detection device and the ground end of the negative pole detection device are both grounded, and the control end of the positive pole detection device is connected to the control end of the negative pole detection device and the detection trigger module 5.

[0069] In a specific embodiment, the circuit composition structure of the above-mentioned positive pole detection device is the same as the circuit composition structure of the above-mentioned first diode D1, second capacitor C2, first resistor R1, second resistor R2 and third resistor R3; the circuit composition structure of the above-mentioned negative pole detection device is the same as the circuit composition structure of the above-mentioned fourth resistor R4, fifth resistor R5, sixth resistor R6, third capacitor C3 and second diode D2.

[0070] In another embodiment, see Figure 1 , Figure 4 and Figure 5 , the detection trigger module 5 includes a seventh diode D7, a sixth capacitor C6, a first optical coupler J1, a first power supply VCC1, a ninth resistor R9, a seventh capacitor C7 and a tenth resistor R10;

[0071] Specifically, the anode of the seventh diode D7 is connected to the IO3 terminal of the first controller U1, the cathode of the seventh diode D7 is connected to the first end of the first optocoupler J1 and is connected to the second end and the ground of the first optocoupler J1 through the sixth capacitor C6, the third end of the first optocoupler J1 is connected to the first power supply VCC1, the fourth end of the first optocoupler J1 is connected to the first end of the tenth resistor R10 and one end of the ninth resistor R9 and is connected to the other end and the ground of the ninth resistor R9 through the seventh capacitor C7, and the second end of the tenth resistor R10 is connected to the control end of the fourth thyristor S4 and the protection control module 10.

[0072] In a specific embodiment, the first optical coupler J1 can be a PC817 photoelectric coupler.

[0073] Furthermore, the detection trigger module 5 also includes a signal transmission device;

[0074] Specifically, the input end of the signal transmission device is connected to the IO4 end of the first controller U1 , and the output end of the signal transmission device is connected to the control end of the negative electrode detection device and the protection control module 10 .

[0075] In a specific embodiment, the circuit composition structure of the above-mentioned signal transmission device is the same as the circuit composition structure of the above-mentioned seventh diode D7, sixth capacitor C6, first optical coupler J1, first power supply VCC1, ninth resistor R9, seventh capacitor C7 and tenth resistor R10.

[0076] In another embodiment, see Figure 1 , Figure 6 and Figure 7 , the protection control module 10 includes a fifth diode D5, a sixth diode D6, a first logic chip U2 and a first switch tube V1;

[0077] Specifically, the anode of the fifth diode D5 is connected to the second end of the eighth resistor R8, the cathode of the sixth diode D6 is connected to the output end of the first inverter INV1, the cathode of the fifth diode D5 is connected to the cathode of the sixth diode D6 and the A end of the first logic chip U2, the B end of the first logic chip U2 is connected to the second end of the tenth resistor R10, the Y end of the first logic chip U2 is connected to the base of the first switch tube V1, the emitter of the first switch tube V1 is grounded, and the collector of the first switch tube V1 is connected to the IO3 end of the first controller U1.

[0078] In a specific embodiment, the first logic chip U2 may be an AND gate chip; the first switch tube V1 may be an NPN transistor.

[0079] Furthermore, the protection control module 10 also includes a second logic chip U3 and a second switch tube V2;

[0080] Specifically, the A end and the B end of the second logic chip U3 are respectively connected to the cathode of the sixth diode D6 and the output end of the signal transmission device, the Y end of the second logic chip U3 is connected to the base of the second switch tube V2, the emitter of the second switch tube V2 is grounded, and the collector of the second switch tube V2 is connected to the IO4 end of the first controller U1.

[0081] In a specific embodiment, the second logic chip U3 may be an XOR gate chip; the second switch tube V2 may be an NPN transistor.

[0082] In a flexible AC / DC power transmission and distribution safety detection circuit of the present embodiment, when the second pulse signal is output at the IO3 terminal of the first controller U1, the first converter T1 performs rectification, and at the same time, the second pulse signal is rectified and filtered through the seventh diode D7 and the sixth capacitor C6, the first optical coupler J1 performs isolated transmission, the seventh capacitor C7 performs energy storage and triggers the first thyristor S1, the second thyristor S2, the third thyristor S3 and the fourth thyristor S4 to turn on, and the first diode D1, the second capacitor C2, the first resistor R1, the second resistor R2 and the third resistor R3 are connected to the first thyristor S1, the second thyristor S2, the third thyristor S3 and the fourth thyristor S4 to turn on. The positive AC component of the electric energy output after rectification by the converter T1 is detected, and the detected signal is transmitted to the first mutual inductor B1 through the first thyristor S1 and the second thyristor S2, and then filtered and amplified by the first operational amplifier OP1 in cooperation with the third diode D3, the third diode D3, the fourth capacitor C4, the fifth capacitor C5, the seventh resistor R7 and the eighth resistor R8. The negative AC component of the electric energy output after rectification by the first converter T1 is detected by the second diode D2, the third capacitor C3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6, and the signal is output to the processing device. The first operational amplifier OP1 outputs a high level when there is a positive AC component. When there is a negative AC component, the signal processing device outputs a low level, and the first inverter INV1 performs an inversion process to output a high level. At this time, both the A and B ends of the first logic chip U2 are high levels. The first logic chip U2 controls the first switch tube V1 to turn on, lowering the signal potential output from the IO3 end of the first controller U1, so that the first converter T1 stops rectifying, and outputs a first pulse signal at the IO4 end of the first converter T1 to control the first converter. When T1 performs the inversion operation, the signal transmission device controls and triggers the positive pole detection device and the negative pole detection device to detect the positive cycle power and the negative cycle power of the AC power respectively, and transmits the detected signals to the positive pole processing module 8 and the negative pole processing module 9 for processing. When the first operational amplifier OP1 and the first inverter INV1 do not output a high level, the A terminal of the second logic chip U3 is a low level, so that the second logic chip U3 controls the second switch tube V2 to turn on, pulls down the signal potential of the IO4 terminal of the first controller U1, and controls the first converter T1 to stop the inversion operation.

[0083] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0084] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A flexible AC / DC power transmission and distribution safety detection circuit, characterized in that: The flexible AC / DC power transmission and distribution safety detection circuit comprises: a DC power grid module, a microcontroller module, a bidirectional conversion module, an AC power grid module, a detection trigger module, a first detection module, a second detection module, a positive electrode processing module, a negative electrode processing module and a protection control module; The DC grid module is connected to the bidirectional conversion module and is used to provide a first DC power and receive a second DC power output by the bidirectional conversion module; The microcontroller module is connected to the bidirectional conversion module, the positive electrode processing module and the negative electrode processing module, and is used to output a first pulse signal and control the bidirectional conversion module to perform an inversion operation, output a second pulse signal and control the bidirectional conversion module to perform a rectification operation, and receive a first processing signal output by the positive electrode processing module and a second processing signal output by the negative electrode processing module; The bidirectional conversion module is connected to the AC power grid module and is used to invert the first DC power and output the second AC power when receiving the first pulse signal, and rectify the first AC power output by the AC power grid module and output the second DC power when receiving the second pulse signal; The AC power grid module is used to provide the first AC power and receive the second AC power; The detection trigger module is connected to the microcontroller module, and is used to perform isolation transmission processing on the first pulse signal and output a first trigger signal, and to perform isolation transmission processing on the second pulse signal and output a second trigger signal; The first detection module is connected to the detection trigger module and the bidirectional conversion module, and is used to perform positive detection on the AC component in the second DC power and output a first detection signal, and perform negative detection on the AC component in the second DC power and output a second detection signal when receiving a second trigger signal; The second detection module is connected to the detection trigger module and the bidirectional conversion module, and is used to perform positive detection on the second AC power and output a third detection signal, and perform negative detection on the second AC power and output a fourth detection signal when receiving the first trigger signal; The positive electrode processing module is connected to the first detection module and the second detection module, and is used to perform isolation transformation, filtering and signal amplification processing on the first detection signal or the third detection signal and output a first processing signal; The negative electrode processing module is connected to the first detection module and the second detection module, and is used to perform isolation transformation, filtering and signal amplification processing on the second detection signal or the fourth detection signal and output a second processing signal, and perform inversion processing on the second processing signal and output a third processing signal; The protection control module is connected to the detection trigger module, the positive electrode processing module, the negative electrode processing module and the microcontrol module, and is used to control the microcontrol module to stop outputting the second pulse signal when the first trigger signal and the first processing signal or the third processing signal are received, and to control the microcontrol module to stop outputting the first pulse signal when the second trigger signal is received and the first processing signal or the third processing signal is not received.

2. A flexible AC / DC power transmission and distribution safety detection circuit according to claim 1, characterized in that: The DC grid module includes a DC grid terminal and a first capacitor; the bidirectional conversion module includes a first converter; the AC grid module includes an AC grid terminal; the microcontroller module includes a first controller; The first end of the DC grid end is connected to the first end of the first capacitor and the first end of the first converter, the second end of the DC grid end is connected to the second end of the first capacitor and the second end of the first converter, the third end of the first converter is connected to the first end of the AC grid end, the fourth end of the first converter is connected to the end of the AC grid end, the rectifier control end of the first converter is connected to the IO3 end of the first controller, and the inverter control end of the first converter is connected to the IO4 end of the first controller.

3. A flexible AC / DC power transmission and distribution safety detection circuit according to claim 2, characterized in that: The first detection module includes a first diode, a second capacitor, a first resistor, a second resistor, a third resistor, a first thyristor, a second thyristor, a third thyristor, a fourth thyristor, a fourth resistor, a fifth resistor, a sixth resistor, a third capacitor and a second diode; The anode of the first diode is connected to the first end of the DC power grid, the cathode of the first diode is connected to one end of the first resistor and one end of the second resistor through the second capacitor, the other end of the second resistor is connected to the first end of the first thyristor, the first end of the second thyristor is connected to the other end of the first resistor, one end of the fifth resistor, one end of the fourth resistor and the ground through the third resistor, the second end of the first thyristor and the control end of the second thyristor are connected to the positive electrode processing module, the other end of the fifth resistor is connected to the first end of the third thyristor, the first end of the fourth thyristor is connected to the other end of the fourth resistor and one end of the third capacitor through the sixth capacitor, the other end of the third capacitor is connected to the anode of the second diode, the cathode of the second diode is connected to the second end of the DC power grid, the control end of the first thyristor is connected to the control end of the second thyristor, the control end of the third thyristor, the control end of the fourth thyristor and the detection trigger module, and the second end of the third thyristor and the second end of the fourth thyristor are connected to the negative electrode processing module.

4. A flexible AC / DC power transmission and distribution safety detection circuit according to claim 3, characterized in that: The positive electrode processing module includes a first mutual inductor, a third diode, a fourth diode, a fourth capacitor, a seventh resistor, a fifth capacitor, a first operational amplifier and an eighth resistor; The first end and the second end of the first mutual inductor are connected to the second end of the first thyristor and the second end of the second thyristor respectively; the third end of the first mutual inductor is connected to the cathode of the third diode, the anode of the fourth diode, one end of the fifth capacitor, one end of the seventh resistor and the in-phase end of the first operational amplifier, and is connected to the inverting end of the first operational amplifier, the cathode of the fourth diode, the anode of the third diode and the fourth end of the first mutual inductor through the fourth capacitor; the output end of the first operational amplifier is connected to the other end of the seventh resistor, the other end of the fifth capacitor and the first end of the eighth resistor; and the second end of the eighth resistor is connected to the IO1 end of the first controller.

5. A flexible AC / DC power transmission and distribution safety detection circuit according to claim 4, characterized in that: The negative electrode processing module includes a signal processing device and a first inverter; The first input terminal and the second input terminal of the signal processing device are respectively connected to the second terminal of the third thyristor and the second terminal of the fourth thyristor, the output terminal of the signal processing device is connected to the input terminal of the first inverter and the IO2 terminal of the first controller, and the output terminal of the first inverter is connected to the protection control module.

6. A flexible AC / DC power transmission and distribution safety detection circuit according to claim 5, characterized in that: The second detection module includes a positive electrode detection device and a negative electrode detection device; The input end of the positive pole detection device and the input end of the negative pole detection device are respectively connected to the third end and the fourth end of the first converter, the first output end and the second output end of the positive pole detection device are respectively connected to the first end and the second end of the first mutual inductor, the first output end and the second output end of the negative pole detection device are respectively connected to the first input end and the second input end of the signal processing device, the ground end of the positive pole detection device and the ground end of the negative pole detection device are both grounded, and the control end of the positive pole detection device is connected to the control end of the negative pole detection device and the detection trigger module.

7. A flexible AC / DC power transmission and distribution safety detection circuit according to claim 6, characterized in that: The detection trigger module includes a seventh diode, a sixth capacitor, a first optical coupler, a first power supply, a ninth resistor, a seventh capacitor and a tenth resistor; The anode of the seventh diode is connected to the IO3 terminal of the first controller, the cathode of the seventh diode is connected to the first end of the first optocoupler and is connected to the second end of the first optocoupler and the ground terminal through the sixth capacitor, the third end of the first optocoupler is connected to the first power supply, the fourth end of the first optocoupler is connected to the first end of the tenth resistor and one end of the ninth resistor and is connected to the other end of the ninth resistor and the ground terminal through the seventh capacitor, and the second end of the tenth resistor is connected to the control end of the fourth thyristor and the protection control module.

8. A flexible AC / DC power transmission and distribution safety detection circuit according to claim 7, characterized in that: The detection trigger module also includes a signal transmission device; The input end of the signal transmission device is connected to the IO4 end of the first controller, and the output end of the signal transmission device is connected to the control end of the negative electrode detection device and the protection control module.

9. A flexible AC / DC power transmission and distribution safety detection circuit according to claim 8, characterized in that: The protection control module includes a fifth diode, a sixth diode, a first logic chip and a first switch tube; The anode of the fifth diode is connected to the second end of the eighth resistor, the cathode of the sixth diode is connected to the output end of the first inverter, the cathode of the fifth diode is connected to the cathode of the sixth diode and the A end of the first logic chip, the B end of the first logic chip is connected to the second end of the tenth resistor, the Y end of the first logic chip is connected to the base of the first switch tube, the emitter of the first switch tube is grounded, and the collector of the first switch tube is connected to the IO3 end of the first controller.

10. A flexible AC / DC power transmission and distribution safety detection circuit according to claim 9, characterized in that: The protection control module also includes a second logic chip and a second switch tube; The A end and the B end of the second logic chip are respectively connected to the cathode of the sixth diode and the output end of the signal transmission device, the Y end of the second logic chip is connected to the base of the second switch tube, the emitter of the second switch tube is grounded, and the collector of the second switch tube is connected to the IO4 end of the first controller.

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