Low-voltage safety protection control circuit

Abstract

The invention discloses a low-voltage safety protection control circuit, and relates to the technical field of low-voltage protection, and the circuit comprises an auxiliary protection module which cooperates with a main protection module to carry out electric energy transmission and supply power to a load module, when a load or a power supply is abnormal, a micro-control module controls a power-off processing module to carry out current reduction processing, and when the switching current is zero, the power-off processing module carries out power-off processing. When the main protection module is powered off, the energy storage control module absorbs instantaneous voltage and stores electric energy, the load module is matched with the protection control module to control the auxiliary protection module to perform electric energy switching when a fault occurs but the main protection module is not powered off, and the power-off processing module and the energy storage control module perform current reduction and electric energy absorption processing again. According to the low-voltage safety protection control circuit, the electric energy transmission safety can be improved, the low-voltage power supply safety can be improved, the influence of abnormal electric energy accessed by the power supply module is avoided, and the protection control precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of low voltage protection, in particular to a low voltage safety protection control circuit. Background Art

[0002] The low-voltage distribution system consists of a distribution substation (usually reducing the transmission voltage of the power grid to a distribution voltage), a high-voltage distribution line (i.e., a voltage above 1 kV), a distribution transformer, a low-voltage distribution line (a voltage below 1 kV), and corresponding control and protection equipment. In order to achieve the power on-off control of the low-voltage distribution line, a low-voltage circuit breaker is generally used for control. However, in the prior art, arcing is prone to occur when the low-voltage circuit breaker is powered off, which makes the low-voltage distribution line subject to a fire risk. If the low-voltage circuit breaker is performing power-off protection due to power abnormality or load abnormality, and the closing coil is abnormal and cannot be cut off normally, the power cannot be cut off, which makes the low-voltage distribution line subject to certain safety hazards. In addition, when the power supply is abnormal, the low-voltage circuit breaker is powered by the power supply, which makes the low-voltage circuit breaker unable to perform protection control normally. Therefore, there is room for improvement. Summary of the invention

[0003] The embodiment of the present invention provides a low voltage safety protection control circuit to solve the problems raised in the above background technology.

[0004] According to an embodiment of the present invention, there is provided a low-voltage safety protection control circuit, comprising: a power module for accessing direct current power;

[0005] The auxiliary protection module is connected to the power supply module, the main protection module, the power-off processing module and the energy storage control module, and is used to transmit DC power to the main protection module, the power-off processing module and the energy storage control module and maintain the power supply to the reverse processing module and the energy storage control module. After the reverse current output by the power-off processing module is superimposed and the switch current is reduced to zero, the power supply to the main protection module is stopped;

[0006] The main protection module is connected to the load module and the power-off processing module, and is used to transmit the input electric energy to the load module, and perform power-off control after being superimposed with the reverse current output by the power-off processing module and when the switch current is reduced to zero;

[0007] A power-off processing module, used for storing input electric energy and oscillating, generating a reverse current and superimposing the reverse current into the main protection module or the auxiliary protection module, thereby reducing the switching current of the main protection module or the auxiliary protection module;

[0008] Energy storage control module, connected to the main protection module and the power-off processing module, is used to absorb the instantaneous voltage generated when the main protection module or the auxiliary protection module switch is turned off when the power-off processing module stops providing reverse current, and then receive and store the residual electric energy in the power-off processing module and the electric energy transmitted by the auxiliary protection module to provide auxiliary electric energy;

[0009] Load module, connected to the energy storage control module, is used to receive auxiliary electric energy, transmit the electric energy transmitted by the main protection module to the connected load device and provide a first signal when the load device is working;

[0010] Protection control module, connected to the load module, is used to self-lock and output a second signal and control the electric energy of the auxiliary protection module to maintain operation when the micro-control module controls the main protection module to cut off power and receives the first signal;

[0011] Micro-control module, connected to the energy storage control module, the auxiliary protection module, the main protection module, the power-off processing module and the protection control module, is used to control the power-off processing module to generate reverse current when a load anomaly occurs, control the power-off operation of the main protection module when the switching current of the main protection module is zero, control the power-off processing module to stop generating reverse current and control the energy storage operation of the energy storage control module, control the power-off processing module to generate reverse current again when receiving the second signal, and control the power-off operation of the auxiliary protection module when the switching current of the auxiliary protection module is zero.

[0012] As a further solution of the present invention: the power supply module includes a power supply interface; the auxiliary protection module includes a first resistor, a first relay switch, a first relay, a second resistor, a third resistor, a second relay, a second relay switch, a first switching tube and a second switching tube;

[0013] Preferably, the first end of the power supply interface is connected to the moving end of the first relay switch and the first moving end of the second relay switch through the first resistor, the static end of the first relay switch is connected to the first inductor and the second moving end of the second relay switch through the second resistor, the first static end of the second relay switch is connected to the second moving end of the second relay switch through the third resistor, the first end of the first relay is connected to the first end of the second relay and the energy storage control module, the second end of the first relay and the second end of the second relay are respectively connected to the collector of the first switching tube and the collector of the second switching tube, the emitter of the first switching tube is connected to the emitter of the second switching tube and the second end of the power supply interface, the base of the first switching tube is connected to the micro-control module, and the base of the second switching tube is connected to the protection control module.

[0014] As a further solution of the present invention: the main protection module includes a first inductor, a third relay switch, a third relay, a third switching tube and a fourth resistor; the micro-control module includes a first controller and a first analog switch;

[0015] Preferably, the moving end of the third relay switch is connected to the second moving end of the second relay switch through a first inductor, the static end of the third relay switch is connected to the first end of a fourth resistor, the second end of the fourth resistor is connected to a load module, the power supply end of the third relay is connected to the collector of a third switching transistor, the emitter of the third switching transistor is grounded, the base of the third switching transistor is connected to the IO3 terminal of a first controller and the IN terminal of a first analog switch, the CTRL terminal of the first analog switch is connected to a protection control module, and the OUT terminal of the first analog switch is connected to the base of a first switching transistor.

[0016] As a further aspect of the present invention: The power-off processing module includes a second inductor, a second diode, a first diode, a third inductor, a fourth inductor, a third diode, a second capacitor, a third capacitor, a second power transistor, a fifth diode, and a sixth diode;

[0017] Preferably, the anode of the second diode is connected to the cathode of the first diode and is connected to the second static end of the second relay switch through a second inductor. The cathode of the second diode is connected to the drain of the second power transistor, the cathode of the sixth diode, and one end of the fourth inductor through a third inductor. The other end of the fourth inductor is connected to the anode of the third diode and is connected to the cathode of the third diode and one end of the third capacitor through a second capacitor. The other end of the third capacitor is connected to the anode of the fifth diode, the source of the second power transistor, and the anode of the first diode. The cathode of the fifth diode is connected to the anode of the sixth diode and the second end of the fourth resistor.

[0018] As a further aspect of the present invention: The energy storage control module includes a fifth inductor, a first varistor, a fourth diode, a first capacitor, a first power transistor, and an energy storage device;

[0019] Preferably, one end of the first varistor is connected to the anode of the fourth diode and is connected to the second static end of the second relay switch through a fifth capacitor. The source of the first power transistor is connected to the first end of the energy storage device and the first end of a first relay. The cathode of the fourth diode is connected to the drain of the first power transistor and is connected to the second end of the energy storage device and the ground terminal through a first capacitor. The gate of the first power transistor is connected to the IO1 terminal of the first controller. The second end of the first varistor is connected to the second end of the fourth resistor.

[0020] As a further aspect of the present invention: The load module includes a first optocoupler, a load interface, and a fifth resistor;

[0021] Preferably, the first end of the load interface is connected to the second end of the fourth resistor. The second end of the load interface is connected to the first end of the first optocoupler. The second end of the first optocoupler is grounded. The third end of the first optocoupler is connected to the first end of the energy storage device. The fourth end of the first optocoupler is connected to a protection module and the first end of the fifth resistor. The second end of the fifth resistor is grounded.

[0022] As a further solution of the present invention: The protection control module includes a seventh diode, an eighth diode, a ninth diode, a twelfth diode, and a first logic chip;

[0023] Preferably, the anodes of the seventh diode and the eighth diode are respectively connected to the IO3 terminal of the first controller and the first terminal of the fifth resistor. The cathode of the seventh diode is connected to the A terminal of the first logic chip and the cathode of the twelfth diode. The cathode of the eighth diode is connected to the B terminal of the first logic chip and the cathode of the ninth diode. The anode of the ninth diode is connected to the anode of the twelfth diode, the Y terminal of the first logic chip, the CTRL terminal of the first analog switch, the IO4 terminal of the first controller, and the base of the second switching transistor.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: The low-voltage safety protection control circuit of the present invention can perform power transmission through the auxiliary protection module and the main protection module, and then supply power to the load module. When a load abnormality or a power supply abnormality occurs, the micro-control module will control the power-off processing module to perform a current reduction process on the main protection module, and when the switching current is zero, control the main protection module to cut off the power. Then, the energy storage control module absorbs the instantaneous voltage and stores the residual electric energy to improve the safety of power transmission. At the same time, when a circuit fault occurs but the main protection module does not perform power-off protection, the load module cooperates with the protection control module to control the auxiliary protection module to perform power switching. The micro-control module then controls the power-off processing module and the energy storage control module to perform current reduction and electric energy absorption processing, and then the auxiliary protection module performs power-off protection processing to improve the safety of low-voltage power supply. At the same time, the auxiliary protection module and the load detection module can be powered by the energy storage control module to avoid being affected by the abnormal electric energy accessed by the power supply module and improve the protection control accuracy. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic block diagram of the principle of a low-voltage safety protection control circuit provided by an embodiment of the present invention.

[0027] Figure 2 It is a circuit diagram of a low-voltage safety protection control circuit provided by an embodiment of the present invention.

[0028] Figure 3 It is a circuit diagram of the load module provided by an embodiment of the present invention.

[0029] Figure 4This is the circuit diagram of the protection control module provided by the embodiment of the present invention. Detailed implementation mode

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] In one embodiment, please refer to Figure 1 , a low-voltage safety protection control circuit, including: a power supply module 1 for accessing DC electrical energy;

[0032] An auxiliary protection module 2 is connected to the power supply module 1, the main protection module 3, the power-off processing module 4, and the energy storage control module 5, and is used to transmit DC electrical energy to the main protection module 3, the power-off processing module 4, and the energy storage control module 5 and maintain the power supply to the circuit processing module and the energy storage control module 5. When the reverse current output by the power-off processing module 4 is superimposed and the switching current drops to zero, it stops supplying power to the main protection module 3;

[0033] The main protection module 3 is connected to the load module 8 and the power-off processing module 4, and is used to transmit the input electrical energy to the load module 8. When the reverse current output by the power-off processing module 4 is superimposed and the switching current drops to zero, it performs power-off control;

[0034] The power-off processing module 4 is used to store the input electrical energy and oscillate, generate a reverse current and superimpose the reverse current into the main protection module 3 or the auxiliary protection module 2 to reduce the switching current of the main protection module 3 or the auxiliary protection module 2;

[0035] The energy storage control module 5 is connected to the main protection module 3 and the power-off processing module 4, and is used to absorb the instantaneous voltage generated when the main protection module 3 or the auxiliary protection module 2 is switched off when the power-off processing module 4 stops providing the reverse current, and then receive and store the residual electrical energy in the power-off processing module 4 and the electrical energy transmitted by the auxiliary protection module 2 to provide auxiliary electrical energy;

[0036] The load module 8 is connected to the energy storage control module 5, and is used to receive auxiliary electrical energy, transmit the electrical energy transmitted by the main protection module 3 to the connected load device and provide a first signal when the load device is working;

[0037] The protection control module 7 is connected to the load module 8, and is used to self-lock and output a second signal and control the power supply of the auxiliary protection module 2 to maintain operation when the micro-control module 6 controls the main protection module 3 to cut off power and receives the first signal;

[0038] The micro - control module 6 is connected to the energy - storage control module 5, the auxiliary protection module 2, the main protection module 3, the power - off processing module 4, and the protection control module 7. It is used to control the power - off processing module 4 to generate a reverse current when a load anomaly occurs. When the switching current of the main protection module 3 is zero, it controls the main protection module 3 to cut off power and controls the power - off processing module 4 to stop generating the reverse current and controls the energy - storage work of the energy - storage control module 5. When receiving the second signal, it controls the power - off processing module to generate a reverse current again, and when the switching current of the auxiliary protection module 2 is zero, it controls the auxiliary protection module 2 to cut off power.

[0039] In a specific embodiment, the above - mentioned power supply module 1 can adopt a power supply circuit composed of a power supply interface and can access DC electric energy; the above - mentioned auxiliary protection module 2 can adopt an auxiliary protection circuit composed of a relay, a resistor, a triode, etc., which can control the transmission state of electric energy and switch to the power supply paths of the power - off processing module 4 and the energy - storage control module 5; the above - mentioned main protection module 3 can adopt a main protection circuit composed of a relay, a resistor, a triode, etc., which can control the transmission of electric energy and is cut off power by the micro - control module 6; the above - mentioned power - off processing module 4 can adopt a break - processing circuit composed of an inductor, a diode, a field - effect transistor, a capacitor, etc., which can perform electric - energy transmission and oscillation processing, provide a reverse current, and can also store electric energy; the above - mentioned energy - storage control module 5 can adopt an energy - storage control circuit composed of an energy - storage device, a varistor, a field - effect transistor, etc., which can perform electric - energy absorption, electric - energy storage, and discharge control; the above - mentioned micro - control module 6 can adopt a micro - control circuit composed of a single - chip microcomputer and an analog switch, integrating many components such as an arithmetic unit, a controller, a memory, and an input - output unit, realizing functions such as signal processing, data storage, module control, and timing control, and can control the signal transmission path; the above - mentioned protection control module 7 can adopt a protection control circuit composed of a logic chip and a diode, which can judge whether the main protection module 3 cuts off power normally and perform high - level self - locking and provide a second signal when the power - off of the main protection module 3 is abnormal; the above - mentioned load module 8 can adopt a load circuit composed of a load interface, an opto - coupler, a load interface, etc., which can be connected to a load device and detect the electric - energy state.

[0040] In another embodiment, please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The power supply module 1 includes a power supply interface; the auxiliary protection module 2 includes a first resistor R1, a first relay switch K1 - 1, a first relay K1, a second resistor R2, a third resistor R3, a second relay K2, a second relay switch K2 - 1, a first switch tube V1, and a second switch tube V2.

[0041] Specifically, the first end of the power interface is connected to the moving end of the first relay switch K1-1 and the first moving end of the second relay switch K2-1 through the first resistor R1. The static end of the first relay switch K1-1 is connected to the first inductor L1 and the second moving end of the second relay switch K2-1 through the second resistor R2. The first static end of the second relay switch K2-1 is connected to the second moving end of the second relay switch K2-1 through the third resistor R3. The first end of the first relay K1 is connected to the first end of the second relay K2 and the energy storage control module 5. The second end of the first relay K1 and the second end of the second relay K2 are respectively connected to the collector of the first switch tube V1 and the collector of the second switch tube V2. The emitter of the first switch tube V1 is connected to the emitter of the second switch tube V2 and the second end of the power interface. The base of the first switch tube V1 is connected to the micro-control module 6, and the base of the second switch tube V2 is connected to the protection control module 7.

[0042] In a specific embodiment, the above-mentioned first relay switch K1-1 can be selected as a normally closed switch, which is controlled by the first relay K1 in a magnetic attraction manner; the above-mentioned second relay switch K2-1 can be selected as a double-pole single-throw switch, and the first moving end and the first static end of the second relay switch K2-1 form a normally open switch, and the second static end and the second moving end form a normally closed switch, which is controlled by the second relay K2 in a continuous manner.

[0043] Furthermore, the main protection module 3 includes a first inductor L1, a third relay switch K3-1, a third relay K3, a third switch tube V3, and a fourth resistor R4; the micro-control module 6 includes a first controller U1 and a first analog switch U2;

[0044] Specifically, the moving end of the third relay switch K3-1 is connected to the second moving end of the second relay switch K2-1 through the first inductor L1. The static end of the third relay switch K3-1 is connected to the first end of the fourth resistor R4. The second end of the fourth resistor R4 is connected to the load module 8. The power supply end of the third relay K3 is connected to the collector of the third switch tube V3. The emitter of the third switch tube V3 is grounded. The base of the third switch tube V3 is connected to the IO3 end of the first controller U1 and the IN end of the first analog switch. The CTRL end of the first analog switch U2 is connected to the protection control module 7, and the OUT end of the first analog switch U2 is connected to the base of the first switch tube V1.

[0045] In a specific embodiment, the above-mentioned third relay switch K3-1 can be a normally open switch, controlled by the third relay K3. The third relay K3 is powered by the DC power supplied by the power supply module 1 and controls the closing of the third relay switch K3-1 in a magnetic attraction manner; the above-mentioned third switch tube V3 can be an NPN-type triode, which controls the third relay K3 to cut off power, and then controls the third relay K3 to stop working; the above-mentioned first controller U1 can be an STM32 single-chip microcomputer; the above-mentioned first analog switch U2 can be a CD4066 analog switch.

[0046] Further, the power-off processing module 4 includes a second inductor L2, a second diode D2, a first diode D1, a third inductor L3, a fourth inductor L4, a third diode D3, a second capacitor C2, a third capacitor C3, a second power transistor Q2, a fifth diode D5, and a sixth diode D6;

[0047] Specifically, the anode of the second diode D2 is connected to the cathode of the first diode D1 and is connected to the second static terminal of the second relay switch K2-1 through the second inductor L2. The cathode of the second diode D2 is connected to the drain of the second power transistor Q2, the cathode of the sixth diode D6, and one end of the fourth inductor L4 through the third inductor L3. The other end of the fourth inductor L4 is connected to the anode of the third diode D3 and is connected to the cathode of the third diode D3 and one end of the third capacitor C3 through the second capacitor C2. The other end of the third capacitor C3 is connected to the anode of the fifth diode D5, the source of the second power transistor Q2, and the anode of the first diode D1. The cathode of the fifth diode D5 is connected to the anode of the sixth diode D6 and the second end of the fourth resistor R4.

[0048] In a specific embodiment, the above-mentioned second inductor L2, third inductor L3, and fourth inductor L4 are all stray inductors; the above-mentioned third capacitor C3 can be a capacitor; the above-mentioned second power transistor Q2 can be an N-channel field effect transistor. When the second power transistor Q2 is turned on, the fourth inductor L4, the third diode D3, and the third capacitor C3 oscillate and provide reverse power. When the second power transistor Q2 is turned off, the third capacitor C3 stores energy.

[0049] Further, the energy storage control module 5 includes a fifth inductor L5, a first varistor MOV, a fourth diode D4, a first capacitor C1, a first power transistor Q1, and an energy storage device;

[0050] Specifically, one end of the first metal oxide varistor MOV is connected to the anode of the fourth diode D4 and is connected to the second static terminal of the second relay switch K2-1 through the fifth capacitor. The source electrode of the first power transistor Q1 is connected to the first end of the energy storage device and the first end of the first relay K1. The cathode of the fourth diode D4 is connected to the drain electrode of the first power transistor Q1 and is connected to the second end of the energy storage device and the ground terminal through the first capacitor C1. The gate electrode of the first power transistor Q1 is connected to the IO1 terminal of the first controller U1. The second end of the first metal oxide varistor MOV is connected to the second end of the fourth resistor R4.

[0051] In a specific embodiment, the above-mentioned fifth inductor L5 is a stray inductor; the above-mentioned energy storage device can be a super capacitor; the above-mentioned first power transistor Q1 can be an N-channel field effect transistor.

[0052] Further, the load module 8 includes a first optocoupler U3, a load interface, and a fifth resistor R5;

[0053] Specifically, the first end of the load interface is connected to the second end of the fourth resistor R4. The second end of the load interface is connected to the first end of the first optocoupler U3. The second end of the first optocoupler U3 is grounded. The third end of the first optocoupler U3 is connected to the first end of the energy storage device. The fourth end of the first optocoupler U3 is connected to the protection module and the first end of the fifth resistor R5. The second end of the fifth resistor R5 is grounded.

[0054] In a specific embodiment, the above-mentioned first optocoupler U3 can be an OPRC-814 optocoupler.

[0055] Further, the protection control module 7 includes a seventh diode D7, an eighth diode D8, a ninth diode D9, a tenth diode D10, and a first logic chip J1;

[0056] Specifically, the anodes of the seventh diode D7 and the eighth diode D8 are respectively connected to the IO3 terminal of the first controller U1 and the first end of the fifth resistor R5. The cathode of the seventh diode D7 is connected to the A terminal of the first logic chip J1 and the cathode of the tenth diode D10. The cathode of the eighth diode D8 is connected to the B terminal of the first logic chip J1 and the cathode of the ninth diode D9. The anode of the ninth diode D9 is connected to the anode of the tenth diode D10, the Y terminal of the first logic chip J1, the CTRL terminal of the first analog switch U2, the IO4 terminal of the first controller U1, and the base electrode of the second switching transistor V2.

[0057] In a specific embodiment, the above-mentioned first logic chip J1 can be a NAND gate chip, which cooperates with the seventh diode D7, the eighth diode D8, the ninth diode D9, and the tenth diode D10 for high-level self-locking.

[0058] In a low-voltage safety protection control circuit of this embodiment, DC electrical energy is accessed through a power interface and is transmitted to a load device connected to a load interface through a first resistor R1, a first relay switch K1-1, a second resistor R2, a first inductor L1, a third relay switch K3-1, and a fourth resistor R4 in sequence. When there is a power abnormality or a load device abnormality, power-off protection is required at this time. The IO2 terminal of the first controller U1 will control the second power transistor Q2 to conduct, and the second moving terminal and the second static terminal of the second relay switch K2-1 will close, so that the fourth inductor L4, the third diode D3, and the third capacitor C3 will oscillate and provide a reverse current for the third relay switch K3-1. Then, the switching current of the third relay switch K3-1 is controlled to decrease, and when the switching current decreases to zero, the IO3 terminal of the first controller U1 controls the third switch transistor V3 to conduct, controls the third relay K3 to lose power, disconnects the third relay switch K3-1, and at the same time stops controlling the second power transistor Q2 to conduct. The third capacitor C3 stores energy, and the first varistor MOV absorbs the instantaneous voltage. The IO1 terminal of the first controller U1 controls the first power transistor Q1 to conduct, then stores the electrical energy stored in the third capacitor C3 and the electrical energy transmitted by the auxiliary protection module 2, and supplies power to the first optocoupler U3, the first relay K1, and the second relay K2, avoiding the influence of the abnormal DC electrical energy accessed through the power interface on the first relay K1 and the second relay K2. At the same time, the first optocoupler U3 detects the power-off situation of the load interface, and when the IO3 terminal of the first controller U1 controls the third switch transistor V3 to conduct, but the third relay switch K3-1 is not disconnected, the first logic chip J1 cooperates with the seventh diode D7, the eighth diode D8, the ninth diode D9, and the twelfth diode D10 to perform high-level self-locking and output a second signal, control the IN terminal and the OUT terminal of the first analog switch U2 to conduct, the second switch transistor V2 to conduct, the first static terminal and the first moving terminal of the second relay switch K2-1 to conduct, and is received by the IO4 terminal of the first controller U1, so that the IO2 terminal of the first controller U1 re-controls the conduction state of the second power transistor Q2, controls the power-off processing module 4 to reduce the switching current of the first relay switch K1-1, and when the switching current of the first relay switch K1-1 decreases to zero, the IO3 terminal of the first controller U1 controls the first switch transistor V1 to conduct, so that the first relay K1 is powered on and controls the first relay switch K1-1 to disconnect, and the power-off processing module 4 stores energy again, the first varistor MOV absorbs the instantaneous voltage, controls the first power transistor Q1 to conduct again, and the energy storage device stores energy.

[0059] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0060] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard 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 low-voltage safety protection control circuit, characterized in that, The low-voltage safety protection control circuit includes: A power supply module for accessing DC electrical energy; An auxiliary protection module connected to the power supply module, the main protection module, the power-off processing module, and the energy storage control module, for transmitting DC electrical energy to the main protection module, the power-off processing module, and the energy storage control module and maintaining the power supply to the circuit processing module and the energy storage control module. When the reverse current output by the power-off processing module is superimposed and the switching current drops to zero, it stops supplying power to the main protection module; A main protection module connected to the load module and the power-off processing module, for transmitting the input electrical energy to the load module. When the reverse current output by the power-off processing module is superimposed and the switching current drops to zero, it performs power-off control; A power-off processing module for storing the input electrical energy and oscillating to generate a reverse current and superimposing the reverse current into the main protection module or the auxiliary protection module to reduce the switching current of the main protection module or the auxiliary protection module; An energy storage control module connected to the main protection module and the power-off processing module, for absorbing the instantaneous voltage generated when the main protection module or the auxiliary protection module switches off when the power-off processing module stops providing the reverse current, then receiving and storing the residual electrical energy in the power-off processing module and the electrical energy transmitted by the auxiliary protection module to provide auxiliary electrical energy; A load module connected to the energy storage control module, for receiving the auxiliary electrical energy, transmitting the electrical energy transmitted by the main protection module to the connected load device and providing a first signal when the load device is working; A protection control module connected to the load module, for self-locking and outputting a second signal and controlling the power supply of the auxiliary protection module to maintain operation when the micro-control module controls the main protection module to cut off power and receives the first signal; A micro-control module connected to the energy storage control module, the auxiliary protection module, the main protection module, the power-off processing module, and the protection control module, for controlling the power-off processing module to generate a reverse current when a load anomaly occurs, controlling the power-off operation of the main protection module when the switching current of the main protection module is zero, controlling the power-off processing module to stop generating the reverse current and controlling the energy storage operation of the energy storage control module, and when receiving the second signal, controlling the power-off processing module to generate the reverse current again and controlling the power-off operation of the auxiliary protection module when the switching current of the auxiliary protection module is zero.

2. The low-voltage safety protection control circuit according to claim 1, characterized in that The power supply module includes a power supply interface; the auxiliary protection module includes a first resistor, a first relay switch, a first relay, a second resistor, a third resistor, a second relay, a second relay switch, a first switching tube, and a second switching tube; The first end of the power interface is connected to the moving end of the first relay switch and the first moving end of the second relay switch through a first resistor. The static end of the first relay switch is connected to the first inductor and the second moving end of the second relay switch through a second resistor. The first static end of the second relay switch is connected to the second moving end of the second relay switch through a third resistor. The first end of the first relay is connected to the first end of the second relay and the energy storage control module. The second end of the first relay and the second end of the second relay are respectively connected to the collector of the first switching tube and the collector of the second switching tube. The emitter of the first switching tube is connected to the emitter of the second switching tube and the second end of the power interface. The base of the first switching tube is connected to the micro-control module, and the base of the second switching tube is connected to the protection control module.

3. The low-voltage safety protection control circuit according to claim 2, characterized in that, The main protection module includes a first inductor, a third relay switch, a third relay, a third switching tube, and a fourth resistor; the micro-control module includes a first controller and a first analog switch; The moving end of the third relay switch is connected to the second moving end of the second relay switch through a first inductor. The static end of the third relay switch is connected to the first end of the fourth resistor. The second end of the fourth resistor is connected to the load module. The power supply end of the third relay is connected to the collector of the third switching tube. The emitter of the third switching tube is grounded. The base of the third switching tube is connected to the IO3 end of the first controller and the IN end of the first analog switch. The CTRL end of the first analog switch is connected to the protection control module. The OUT end of the first analog switch is connected to the base of the first switching tube.

4. A low-voltage safety protection control circuit according to claim 3, characterized in that, The power-off processing module includes a second inductor, a second diode, a first diode, a third inductor, a fourth inductor, a third diode, a second capacitor, a third capacitor, a second power tube, a fifth diode, and a sixth diode; The anode of the second diode is connected to the cathode of the first diode and is connected to the second static end of the second relay switch through a second inductor. The cathode of the second diode is connected to the drain of the second power tube, the cathode of the sixth diode, and one end of the fourth inductor through a third inductor. The other end of the fourth inductor is connected to the anode of the third diode and is connected to the cathode of the third diode and one end of the third capacitor through a second capacitor. The other end of the third capacitor is connected to the anode of the fifth diode, the source of the second power tube, and the anode of the first diode. The cathode of the fifth diode is connected to the anode of the sixth diode and the second end of the fourth resistor.

5. The low-voltage safety protection control circuit according to claim 4, characterized in that, The energy storage control module includes a fifth inductor, a first varistor, a fourth diode, a first capacitor, a first power tube, and an energy storage device; One end of the first varistor is connected to the anode of the fourth diode and is connected to the second static end of the second relay switch through a fifth capacitor. The source of the first power tube is connected to the first end of the energy storage device and the first end of the first relay. The cathode of the fourth diode is connected to the drain of the first power tube and is connected to the second end of the energy storage device and the ground end through a first capacitor. The gate of the first power tube is connected to the IO1 end of the first controller. The second end of the first varistor is connected to the second end of the fourth resistor.

6. The low-voltage safety protection control circuit according to claim 5, wherein The load module includes a first optocoupler, a load interface, and a fifth resistor; The first end of the load interface is connected to the second end of the fourth resistor, the second end of the load interface is connected to the first end of the first optocoupler, the second end of the first optocoupler is grounded, the third end of the first optocoupler is connected to the first end of the energy storage device, and the fourth end of the first optocoupler is connected to the first end of the protection module and the fifth resistor, and the second end of the fifth resistor is grounded.

7. The low-voltage safety protection control circuit according to claim 6, wherein, The protection control module includes a seventh diode, an eighth diode, a ninth diode, a twelfth diode, and a first logic chip; The anodes of the seventh diode and the eighth diode are respectively connected to the IO3 terminal of the first controller and the first end of the fifth resistor. The cathode of the seventh diode is connected to the A terminal of the first logic chip and the cathode of the twelfth diode. The cathode of the eighth diode is connected to the B terminal of the first logic chip and the cathode of the ninth diode. The anode of the ninth diode is connected to the anode of the twelfth diode, the Y terminal of the first logic chip, the CTRL terminal of the first analog switch, the IO4 terminal of the first controller, and the base of the second switching transistor.

Images