A flexible AC / DC power transmission and distribution safety detection circuit

Abstract

This invention discloses a flexible AC / DC power transmission and distribution safety detection circuit, relating to the field of AC / DC detection technology. It includes a DC grid module for providing and receiving DC power; a microcontroller module for signal reception and module control; a bidirectional converter module for inversion and rectification; an AC grid module for providing and receiving AC power; a detection trigger module for transmitting signals sampled by a second detection module during inversion and signals detected by a first detection module during rectification; a first detection module for detecting the rectified output power; a second detection module for detecting the inverted output power; positive and negative processing modules for processing input signals; and a protection control module for fault diagnosis and controlling the bidirectional converter module to stop operating. This flexible AC / DC power transmission and distribution safety detection circuit automatically detects power distribution on both the AC and DC sides, improving power distribution safety.

Description

Technical Field

[0001] This invention relates to the field of AC / DC detection technology, specifically a flexible AC / DC power transmission and distribution safety detection circuit. Background Technology

[0002] Flexible AC / DC power transmission and distribution systems mainly include flexible AC transmission technology and flexible DC transmission technology. They enable power conversion control between DC and AC power grids, enhancing the stability of both. To ensure safe conversion control between DC and AC power grids, existing flexible AC / DC power transmission and distribution systems typically employ power transmission and distribution safety detection circuits on both the DC and AC sides of the converter. This allows for power distribution safety monitoring of both sides, preventing power anomalies on either the DC or AC side due to converter malfunctions. However, these safety detection circuits cannot automatically select which side to monitor based on the converter's operating status, and using safety detection circuits on both sides increases monitoring costs. Therefore, improvements are needed. Summary of the Invention

[0003] This invention provides a flexible AC / DC power transmission and distribution safety detection circuit to solve the problems mentioned in the background art.

[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, is used to provide a first DC power and receive a second DC power output from the bidirectional conversion module;

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

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

[0008] An AC power grid module is used to provide a first AC power source and receive a second AC power source.

[0009] The detection trigger module is connected to the microcontroller module and is used to isolate and transmit the first pulse signal and output the first trigger signal, and to isolate and transmit the second pulse signal and output the second trigger signal.

[0010] The first detection module, connected to the detection trigger module and the bidirectional conversion module, is used to detect the positive pole of the AC component in the second DC power and output a first detection signal when the second trigger signal is received, and to detect the negative pole of the AC component in the second DC power and output a second detection signal.

[0011] The second detection module, connected to the detection trigger module and the bidirectional conversion module, is used to detect the positive pole of the second AC power and output a third detection signal when the first trigger signal is received, and to detect the negative pole of the second AC power and output a fourth detection signal.

[0012] 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 the first processed signal.

[0013] The negative electrode processing module is connected to the first detection module and the second detection module. It is used to isolate, transform, filter and amplify the second detection signal or the fourth detection signal and output the second processed signal, and to invert the second processed signal and output the third processed 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 microcontroller module. When a first trigger signal is received and a first processing signal or a third processing signal is received, the microcontroller module will stop outputting the second pulse signal. When a second trigger signal is received but the first processing signal or the third processing signal is not received, the microcontroller module will stop outputting the first pulse signal.

[0015] As a further embodiment 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; and the microcontroller module includes a first controller.

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

[0017] As a further embodiment 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 terminal 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 terminal of the first thyristor, the first terminal 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 ground through the third resistor, the second terminal of the first thyristor and the control terminal of the second thyristor are connected to the positive electrode processing module, the other end of the fifth resistor is connected to the first terminal of the third thyristor, the first terminal 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 terminal of the DC power grid, the control terminal of the first thyristor is connected to the control terminals of the second thyristor, the third thyristor, the fourth thyristor and the detection trigger module, and the second terminals of the third thyristor and the second terminals of the fourth thyristor are connected to the negative electrode processing module.

[0019] As a further embodiment of the present invention: the positive electrode processing module includes a first current transformer, 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 and second terminals of the first current transformer are respectively connected to the second terminals of the first and second thyristors. The third terminal of the first current transformer 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 non-inverting terminal of the first operational amplifier. It is also connected to the inverting terminal of the first operational amplifier, the cathode of the fourth diode, the anode of the third diode, and the fourth terminal of the first current transformer through the fourth capacitor. The output terminal 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 terminal of the eighth resistor. The second terminal of the eighth resistor is connected to the IO1 terminal of the first controller.

[0021] As a further embodiment 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 embodiment of the present invention: the second detection module includes a positive electrode detection device and a negative electrode detection device;

[0024] Preferably, the input terminals of the positive electrode detection device and the negative electrode detection device are connected to the third and fourth terminals of the first converter, respectively; the first and second output terminals of the positive electrode detection device are connected to the first and second terminals of the first current transformer, respectively; the first and second output terminals of the negative electrode detection device are connected to the first and second input terminals of the signal processing device, respectively; the grounding terminals of the positive and negative electrode detection devices are both grounded; and the control terminal of the positive electrode detection device is connected to the control terminal of the negative electrode detection device and the detection trigger module.

[0025] As a further embodiment of the present invention: the detection trigger module includes a seventh diode, a sixth capacitor, a first optocoupler, 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 terminal of the first optocoupler and connected to the second terminal of the first optocoupler and ground through the sixth capacitor, the third terminal of the first optocoupler is connected to the first power supply, the fourth terminal of the first optocoupler is connected to the first terminal of the tenth resistor and one terminal of the ninth resistor and connected to the other terminal of the ninth resistor and ground through the seventh capacitor, and the second terminal of the tenth resistor is connected to the control terminal of the fourth thyristor and the protection control module.

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

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

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

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

[0031] As a further embodiment of the present invention: the protection control module further includes a second logic chip and a second switching transistor;

[0032] Preferably, the A and B terminals of the second logic chip are connected to the cathode of the sixth diode and the output terminal of the signal transmission device, respectively; the Y terminal of the second logic chip is connected to the base of the second switching transistor; the emitter of the second switching transistor is grounded; and the collector of the second switching transistor is connected to the IO4 terminal 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 operation of the bidirectional converter module through the micro-control module, control the AC grid module and the DC grid module to perform power interaction, and at the same time, during rectification, the detection trigger module transmits the power energy after rectification by the bidirectional converter module detected by the first detection module to the positive and negative processing modules, and then detects whether there is an AC component in the rectified DC power energy. If there is an AC component, the protection control module controls the bidirectional converter module to stop rectification. During inversion, the detection trigger module automatically transmits the power energy after inversion by the bidirectional converter module detected by the second detection module to the positive and negative processing modules, and then determines whether the bidirectional converter module is performing inversion normally. If it is not performing inversion, the protection control module controls the bidirectional converter module to stop inversion, thus automatically realizing the power distribution detection of the AC and DC sides and improving power distribution safety. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is 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 The circuit diagram is provided for a flexible AC / DC power transmission and distribution safety detection circuit according to an embodiment of the present invention.

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

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

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

[0040] Figure 6 The first circuit diagram of the protection control module provided in the embodiment of the present invention.

[0041] Figure 7 The second circuit diagram of the protection control module provided in the embodiment of the present invention. Detailed Implementation

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall 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 includes: 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 the first DC power and receive the 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. It is used to output a first pulse signal and control the bidirectional conversion module 3 to perform inversion, output a second pulse signal and control the bidirectional conversion module 3 to perform rectification, and receive the first processing signal output by the positive electrode processing module 8 and the second processing signal output by the negative electrode processing module 9.

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

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

[0048] The detection trigger module 5 is connected to the microcontroller module 2 and is used to isolate and transmit the first pulse signal and output the first trigger signal, and to isolate and transmit the second pulse signal and output the second trigger signal.

[0049] The first detection module 6 is connected to the detection trigger module 5 and the bidirectional conversion module 3. When the second trigger signal is received, it performs positive detection on the AC component of the second DC power and outputs a first detection signal, and performs negative detection on the AC component of the second DC power and outputs a second detection signal.

[0050] The second detection module 7 is connected to the detection trigger module 5 and the bidirectional conversion module 3. When the first trigger signal is received, it performs positive detection on the second AC power and outputs a third detection signal, and performs negative detection on the second AC power and outputs a fourth detection signal.

[0051] The positive electrode processing module 8 is connected to the first detection module 6 and the second detection module 7, and is used to perform isolation transformation, filtering and signal amplification processing on the first detection signal or the third detection signal and output the first processed signal.

[0052] The negative electrode processing module 9 is connected to the first detection module 6 and the second detection module 7. It is used to isolate, transform, filter and amplify the second detection signal or the fourth detection signal and output the second processed signal, and to invert the second processed signal and output the third processed 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 microcontroller module 2. When a first trigger signal is received and a first processing signal or a third processing signal is received, the microcontroller module 2 will stop outputting the second pulse signal. When a second trigger signal is received but the first processing signal or the third processing signal is not received, the microcontroller module 2 will stop outputting the first pulse signal.

[0054] In a specific embodiment, the DC grid module 1 can be a DC grid circuit composed of a DC grid terminal and a capacitor, which can provide DC power and also receive power output from the bidirectional conversion module 3; the microcontroller module 2 can be a microcontroller circuit composed of a single-chip microcomputer, integrating arithmetic units, controllers, memory, and input / output devices, etc., to realize functions such as signal processing, data storage, module control, and timing control; the bidirectional conversion module 3 can be a bidirectional conversion circuit composed of a bidirectional converter, performing single-phase rectification and inversion processing; the AC grid module 4 can be an AC grid circuit composed of an AC grid terminal, which can provide AC power and also receive power output from the bidirectional conversion module 3; the detection trigger module 5 can be a detection trigger circuit composed of an optocoupler, capacitor, resistor, etc., to isolate and transmit the signal output from the microcontroller 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 capacitors, resistors, and diodes can be used to detect the positive and negative electrical energy output after rectification by the bidirectional converter module 3. The second detection module 7 can be a second detection circuit composed of positive and negative detection devices to detect the positive and negative electrical energy output after inversion by the bidirectional converter module 3. The positive processing module 8 can be a positive processing circuit composed of transformers, diodes, operational amplifiers, etc., to isolate, sample, filter, and amplify the input signal. The negative processing module 9 can be a negative processing circuit composed of transformers, diodes, operational amplifiers, etc., to isolate, sample, filter, amplify, and invert the input signal. The protection control module 10 can be a protection control circuit composed of logic chips, diodes, transistors, etc., to determine whether the bidirectional converter module 3 is abnormal based on the high and low level states of the input signal, and to stop the inversion or rectification operation when an abnormality occurs.

[0055] In another embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The DC grid module 1 includes a DC grid terminal and a first capacitor C1; the bidirectional conversion module 3 includes a first converter T1; the AC grid module 4 includes an AC grid terminal; and the microcontroller module 2 includes a first controller U1.

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

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

[0058] Furthermore, 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 terminal of the DC power grid. 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 terminal of the first thyristor S1. The first terminal 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 ground through the third resistor R3. The second terminal of the first thyristor S1 and the control terminal 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 first terminal of the third thyristor S3 is connected to the first terminal of the fourth thyristor S4. The first terminal of the fourth thyristor S4 is connected to the other terminal of the fourth resistor R4 and the first terminal of the third capacitor C3 through the sixth capacitor C6. The other terminal 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 terminal of the DC power grid. The control terminal of the first thyristor S1 is connected to the control terminals of the second thyristor S2, the third thyristor S3, the fourth thyristor S4 and the detection trigger module 5. The second terminals of the third thyristor S3 and the second terminals 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 electrical 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 electrical energy; the first thyristor S1, the second thyristor S2, the third thyristor S3, and the fourth thyristor S4 can all be bidirectional thyristors.

[0061] Furthermore, the positive electrode processing module 8 includes a first current transformer 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 and second terminals of the first current transformer B1 are respectively connected to the second terminals of the first thyristor S1 and the second terminals of the second thyristor S2. The third terminal of the first current transformer 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 non-inverting terminal of the first operational amplifier OP1. It is also connected to the inverting terminal of the first operational amplifier OP1, the cathode of the fourth diode D4, the anode of the third diode D3, and the fourth terminal of the first current transformer B1 through the fourth capacitor C4. The output terminal 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 terminal of the eighth resistor R8. The second terminal of the eighth resistor R8 is connected to the IO1 terminal of the first controller U1.

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

[0064] Furthermore, 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 structure of the above-mentioned signal processing device is the same as that of the first mutual inductor B1, the third diode D3, the fourth diode D4, the fourth capacitor C4, the seventh resistor R7, the fifth capacitor C5, the first operational amplifier OP1 and the eighth resistor R8; the first inverter INV1 can be a NOT gate chip.

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

[0068] Specifically, the input terminals of the positive electrode detection device and the negative electrode detection device are connected to the third and fourth terminals of the first converter T1, respectively. The first and second output terminals of the positive electrode detection device are connected to the first and second terminals of the first current transformer B1, respectively. The first and second output terminals of the negative electrode detection device are connected to the first and second input terminals of the signal processing device, respectively. The grounding terminals of both the positive and negative electrode detection devices are grounded. The control terminal of the positive electrode detection device is connected to the control terminal of the negative electrode detection device and the detection trigger module 5.

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

[0070] In another embodiment, please refer to Figure 1 , Figure 4 and Figure 5 The detection trigger module 5 includes a seventh diode D7, a sixth capacitor C6, a first optocoupler 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 terminal of the first optocoupler J1 and connected to the second terminal of the first optocoupler J1 and ground through the sixth capacitor C6, the third terminal of the first optocoupler J1 is connected to the first power supply VCC1, the fourth terminal of the first optocoupler J1 is connected to the first terminal of the tenth resistor R10 and one terminal of the ninth resistor R9 and connected to the other terminal of the ninth resistor R9 and ground through the seventh capacitor C7, and the second terminal of the tenth resistor R10 is connected to the control terminal of the fourth thyristor S4 and the protection control module 10.

[0072] In a specific embodiment, the first optocoupler J1 can be a PC817 optocoupler.

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

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

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

[0076] In another embodiment, please refer to 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 switching transistor V1;

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

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

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

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

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

[0082] In this embodiment of a flexible AC / DC power transmission and distribution safety detection circuit, when the second pulse signal is output from the IO3 terminal of the first controller U1, the first converter T1 performs rectification. Simultaneously, the second pulse signal is rectified and filtered by the seventh diode D7 and the sixth capacitor C6. The first optocoupler J1 performs isolation transmission, and the seventh capacitor C7 stores energy and triggers the conduction of the first thyristor S1, the second thyristor S2, the third thyristor S3, and the fourth thyristor S4. The first diode D1, the second capacitor C2, the first resistor R1, the second resistor R2, and the third resistor R3 then conduct the first... The positive AC component of the rectified output power from converter T1 is detected. The detected signal is transmitted to the first current transformer B1 via the first thyristor S1 and the second thyristor S2. Then, it is filtered and amplified by the first operational amplifier OP1 in conjunction with 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 rectified output power from 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. The signal is then output to the processing device. Isolation sampling and filtering amplification are performed. When a positive AC component is present, the first operational amplifier OP1 outputs a high level; when a negative AC component is present, the signal processing device outputs a low level, which is then inverted by the first inverter INV1, resulting in a high level output. At this time, both terminals A and B of the first logic chip U2 are high, and the first logic chip U2 controls the first switching transistor V1 to conduct, pulling down the signal potential output from the IO3 terminal of the first controller U1. This causes the first converter T1 to stop rectifying, and the first pulse signal is output from the IO4 terminal of the first converter T1 to control the first converter. When T1 is performing inverter operation, the signal transmission device simultaneously controls and triggers the positive and negative detection devices to detect the positive and negative cycle energy of the AC power, respectively, and transmits the detected signals to the positive processing module 8 and the negative processing module 9 for processing. When neither the first operational amplifier OP1 nor the first inverter INV1 outputs a high level, the A terminal of the second logic chip U3 is at a low level, causing the second logic chip U3 to control the second switching transistor V2 to conduct, pulling down the signal potential of the IO4 terminal of the first controller U1, and controlling the first converter T1 to stop inverter operation.

[0083] It will be apparent to those skilled in the art that the present 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 its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0084] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A flexible AC / DC power transmission and distribution safety detection circuit, characterized in that: The flexible AC / DC power transmission and distribution safety detection circuit includes: a DC grid module, a microcontroller module, a bidirectional conversion module, an AC 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 power grid module is connected to the bidirectional conversion module and is used to provide first DC power and receive second DC power output from 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. It is used to output a first pulse signal and control the bidirectional conversion module to perform inversion, output a second pulse signal and control the bidirectional conversion module to perform rectification, and receive the first processing signal output by the positive electrode processing module and the second processing signal output by the negative electrode processing module. The bidirectional conversion module is connected to the AC grid module and is used to invert the first DC power and output the second AC power when receiving the first pulse signal, and to rectify the first AC power output by the AC grid module and output the second DC power when receiving the second pulse signal. The AC power grid module is used to provide a first AC power and receive a second AC power; The detection trigger module is connected to the microcontroller module and is used to isolate and transmit the first pulse signal and output a first trigger signal, and to isolate and transmit the second pulse signal and output a second trigger signal. The first detection module, connected to the detection trigger module and the bidirectional conversion module, is used to detect the positive pole of the AC component in the second DC power and output a first detection signal when the second trigger signal is received, and to detect the negative pole of the AC component in the second DC power and output a second detection signal. The second detection module, connected to the detection trigger module and the bidirectional conversion module, is used to detect the positive pole of the second AC power and output a third detection signal, and detect the negative pole of the second AC power and output a fourth detection signal when the first trigger signal is received. 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 the first processed signal. The negative electrode processing module is connected to the first detection module and the second detection module. It is used to isolate, transform, filter and amplify the second detection signal or the fourth detection signal and output the second processed signal, and to invert the second processed signal and output the third processed signal. The protection control module is connected to the detection trigger module, the positive electrode processing module, the negative electrode processing module, and the microcontroller module. When a first trigger signal is received and a first processing signal or a third processing signal is received, the microcontroller module will stop outputting the second pulse signal. When a second trigger signal is received but the first processing signal or the third processing signal is not received, the microcontroller module will stop outputting the first pulse signal.

2. The 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 terminal 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 terminal 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 terminal. The fourth end of the first converter is connected to the first end of the AC grid terminal. The rectifier control terminal of the first converter is connected to the IO3 terminal of the first controller. The inverter control terminal of the first converter is connected to the IO4 terminal of the first controller.

3. The 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 terminal 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 terminal of the first thyristor. The first terminal 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 ground through the third resistor. The second terminal of the first thyristor and the control terminal of the second thyristor are connected to the positive electrode processing module. The other end of the fifth resistor is connected to the first terminal of the third thyristor. The first terminal 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 terminal of the DC power grid. The control terminal of the first thyristor is connected to the control terminals of the second, third, and fourth thyristors and the detection trigger module. The second terminals of the third and fourth thyristors are connected to the negative electrode processing module.

4. The 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 current transformer, 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 and second terminals of the first current transformer are respectively connected to the second terminals of the first and second thyristors. The third terminal of the first current transformer 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 non-inverting terminal of the first operational amplifier. It is also connected to the inverting terminal of the first operational amplifier, the cathode of the fourth diode, the anode of the third diode, and the fourth terminal of the first current transformer through the fourth capacitor. The output terminal 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 terminal of the eighth resistor. The second terminal of the eighth resistor is connected to the IO1 terminal of the first controller.

5. The 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 and second input terminals of the signal processing device are respectively connected to the second terminals of the third and fourth thyristors. 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. The output terminal of the first inverter is connected to the protection control module.

6. The 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 terminals of the positive and negative detection devices are respectively connected to the third and fourth terminals of the first converter. The first and second output terminals of the positive detection device are respectively connected to the first and second terminals of the first current transformer. The first and second output terminals of the negative detection device are respectively connected to the first and second input terminals of the signal processing device. The grounding terminals of the positive and negative detection devices are both grounded. The control terminal of the positive detection device is connected to the control terminal of the negative detection device and the detection trigger module.

7. The 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 optocoupler, 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 terminal of the first optocoupler and connected to the second terminal of the first optocoupler and ground through the sixth capacitor, the third terminal of the first optocoupler is connected to the first power supply, the fourth terminal of the first optocoupler is connected to the first terminal of the tenth resistor and one terminal of the ninth resistor and connected to the other terminal of the ninth resistor and ground through the seventh capacitor, and the second terminal of the tenth resistor is connected to the control terminal of the fourth thyristor and the protection control module.

8. The flexible AC / DC power transmission and distribution safety detection circuit according to claim 7, characterized in that, The detection triggering module also includes a signal transmission device; The input terminal of the signal transmission device is connected to the IO4 terminal of the first controller, and the output terminal of the signal transmission device is connected to the control terminal 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 switching transistor; The anode of the fifth diode is connected to the second terminal of the eighth resistor, the cathode of the sixth diode is connected to the output terminal of the first inverter, the cathode of the fifth diode is connected to the cathode of the sixth diode and the A terminal of the first logic chip, the B terminal of the first logic chip is connected to the second terminal of the tenth resistor, the Y terminal of the first logic chip is connected to the base of the first switching transistor, the emitter of the first switching transistor is grounded, and the collector of the first switching transistor is connected to the IO3 terminal 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 switching transistor; The A and B terminals of the second logic chip are respectively connected to the cathode of the sixth diode and the output terminal of the signal transmission device. The Y terminal of the second logic chip is connected to the base of the second switching transistor. The emitter of the second switching transistor is grounded. The collector of the second switching transistor is connected to the IO4 terminal of the first controller.

Images