Power equipment safety protection circuit
By combining the power supply module and the branch control module, accurate short-circuit fault identification and disconnection of multiple power supply output ports of power equipment can be achieved, solving the problem of high detection cost in the existing technology, improving power supply safety and reducing monitoring cost.
Patent Information
- Application Number
- CN202511189951.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-25
- Publication Date
- 2025-11-18
AI Technical Summary
Existing power equipment safety protection circuits cannot accurately identify branch short-circuit faults when there are multiple power output ports, resulting in high detection costs and the inability to achieve automatic identification of branch faults.
The system employs a combination of a power supply module, a voltage detection module, a short circuit detection module, a status detection module, a power supply module, and a branch control module. It uses potential signals to detect short circuits and performs timed, sequential power supply restoration to ensure that only the faulty branch is disconnected.
This technology enables the accurate disconnection of short-circuit fault branches while reducing monitoring costs and improving the power supply safety of electrical equipment.
Smart Images
Figure CN120978634A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of power equipment safety, in particular to a power equipment safety protection circuit. BACKGROUND
[0002] In the field of power equipment safety, the safety protection circuit of power equipment is the most commonly used means, which can perform short-circuit protection when the power equipment has a short circuit. When the power equipment has multiple power output ports, short-circuit detection and short-circuit protection of branch output ports are implemented. The current power equipment safety protection circuit generally uses short-circuit detection devices, circuit breakers, microcontrollers, etc. for one-to-many detection, but cannot distinguish the state of each branch. One-to-one detection is performed, but it will result in a large number of short-circuit detection devices required, high cost, specifically, when multiple output ports are connected in parallel, the short-circuit detection device detects the short-circuit of the total power, and when a short-circuit occurs, the microcontroller controls the circuit breaker to perform power-off protection, so that the multiple output ports directly stop power supply, which cannot automatically determine whether the output port short-circuit or the power supply short-circuit, and then cannot accurately disconnect the output branch where the short-circuit fault occurs. If a short-circuit detection device is used for each branch, it will result in a large number of short-circuit detection devices required, and the detection cost is very high.
[0003] In summary, the safety protection circuit of power equipment currently has the problems of high one-to-one detection cost, inability to identify branch faults in one-to-many detection, and inability to balance monitoring quality and monitoring cost. SUMMARY
[0004] The purpose of the present application is to provide a power equipment safety protection circuit, which can accurately disconnect the output branch where the short-circuit fault occurs, improve the power supply safety of power equipment, and reduce the monitoring cost.
[0005] To achieve the above purpose, the present application provides the following solutions:
[0006] The application provides a power equipment safety protection circuit, which comprises a power supply module 1, a voltage detection module 2, a short-circuit judgment module 3, a state detection module 4, a first power supply module 5, a second power supply module 6, a shunt control module 7 and an output module 8; the power supply module 1 is connected with an external AC power supply, the voltage detection module 2, the first power supply module 5, the second power supply module 6 and the shunt control module 7 respectively; the power supply module 1 is used for outputting electric energy after performing voltage reduction, rectification and voltage stabilization on the external AC power supply; the voltage detection module 2 is connected with the short-circuit judgment module 3, and is used for performing signal conditioning on the external AC power supply and outputting a potential signal; the short-circuit judgment module 3 is connected with the state detection module 4; the short-circuit judgment module 3 is used for performing short-circuit judgment based on the potential signal according to a preset strategy, and when the judgment result is abnormal, a first short-circuit signal is sent; when the judgment result is normal, a second control signal is sent; the state detection module 4 is connected with the power supply module 1, the first power supply module 5 and the second power supply module 6 respectively; when the state detection module 4 receives the first short-circuit signal, the state detection module 4 is self-locked and outputs a third control signal; when the state detection module 4 receives the second control signal after outputting the third control signal, the state detection module 4 is self-locked and outputs a first control signal; the shunt control module 7 is connected with the first power supply module 5 and the second power supply module 6 respectively; the first power supply module 5 and the second power supply module 6 are connected with the output module 8; the output module 8 is connected with an external power equipment; when the first power supply module 5 and the second power supply module 6 receive the third control signal, the first power supply module 5 and the second power supply module 6 are self-locked after power-off; after the first power supply module 5 and the second power supply module 6 are self-locked after power-off, the shunt control module 7 outputs a first self-check signal and a second self-check signal in turn according to a timing sequence, and the first power supply module 5 and the second power supply module 6 are sequentially restored to supply power; when the first power supply module 5 or the second power supply module 6 is restored to supply power, and the first short-circuit signal is received again, the shunt control module 7 disconnects the module with a fault from the first power supply module 5 and the second power supply module 6.
[0007] According to the specific embodiments provided in the application, the following technical effects are disclosed.
[0008] The application supplies power for the system after the AC power is stepped down, rectified and stabilized by the power module; the voltage detection module monitors the power grid state in real time and outputs a potential signal; the short circuit judgment module judges whether there is a short circuit according to the signal, triggers a short circuit signal when there is an abnormality, and outputs a control signal when there is normality; the state detection module realizes self-locking control according to the received signal; the branch control module first cuts off the dual power supply when detecting a short circuit, then restores the power supply through a timing sequence, and if a short circuit still occurs after the branch power supply, it is determined that the branch is a fault branch and is permanently disconnected, so that the system is only powered by a normal branch. The application has a double protection mechanism, which can accurately disconnect the output branch where a short circuit fault occurs, improve the power supply safety of power equipment, and also reduce the monitoring cost. BRIEF DESCRIPTION OF DRAWINGS
[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.
[0010] Figure 1 A module structure diagram of a power equipment safety protection circuit provided for the embodiment of the present application.
[0011] Figure 2 A circuit diagram of a power equipment safety protection circuit provided for the embodiment of the present application.
[0012] Figure 3 A circuit diagram of a short circuit judgment module provided for the embodiment of the present application.
[0013] Figure 4 A circuit diagram of a branch control module provided for the embodiment of the present application.
[0014] Reference signs:
[0015] Power supply module 1; Voltage detection module 2; Short circuit detection module 3; Status detection module 4; First power supply module 5; Second power supply module 6; Branch control module 7; Output module 8; First diode D1; Second diode D2; Third diode D3; Fourth diode D4; Fifth diode D5; Sixth diode D6; Seventh diode D7; Eighth diode D8; Ninth diode D9; Tenth diode D10; First resistor R1; Second resistor R2; Third resistor R3; Fourth resistor R4; Fifth resistor R5; Sixth resistor R6; Seventh resistor R7; Eighth resistor R8; First capacitor C1; Second capacitor C2; Third capacitor C2; C3; First switch V1; Second switch V2; Third switch V3; First logic chip J1; Second logic chip J2; Third logic chip J3; Fourth logic chip J4; First transformer B1; First relay K1; Second relay K2; First threshold device YZ1; Second threshold device YZ2; First comparator A1; Second comparator A2; First trigger IC1; First counter IC2; Power interface PWR; Voltage regulator DY; First power transistor Q1; First transformer PT1; First operational amplifier OP1; Phase shifter YX; First power supply VCC1; Phase shifter YX; First inverter INV. Detailed Implementation
[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0017] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0018] Example 1, such as Figures 1-2 As shown, this embodiment provides a power equipment safety protection circuit, which includes: a power supply module 1, a voltage detection module 2, a short circuit judgment module 3, a status detection module 4, a first power supply module 5, a second power supply module 6, a branch control module 7, and an output module 8.
[0019] Power module 1 is connected to external AC power supply, voltage detection module 2, first power supply module 5, second power supply module 6 and branch control module 7 respectively; power module 1 is used to output electrical energy after step-down rectification and voltage regulation of external AC power supply.
[0020] The voltage detection module 2 is connected with the short circuit judgment module 3, and the voltage detection module 2 is used for signal conditioning of the external AC power supply and outputs a potential signal.
[0021] The short circuit judgment module 3 is connected with the state detection module 4; the short circuit judgment module 3 is used for short circuit judgment based on the potential signal according to a preset strategy, and when the judgment result is abnormal, a first short circuit signal is sent; when the judgment result is normal, a second control signal is sent.
[0022] The state detection module 4 is connected with the power supply module 1, the first power supply module 5 and the second power supply module 6 respectively; the state detection module 4 is used for self-locking and outputting a third control signal when receiving the first short circuit signal; and when receiving the second control signal after outputting the third control signal, the state detection module 4 is used for self-locking and outputting a first control signal.
[0023] The shunt control module 7 is connected with the first power supply module 5 and the second power supply module 6 respectively; the first power supply module 5 and the second power supply module 6 are connected with the output module 8; the output module 8 is connected with the external power equipment; the first power supply module 5 and the second power supply module 6 are powered off and self-locked when receiving the third control signal; the shunt control module 7 outputs a first self-check signal and a second self-check signal in turn according to a timing sequence after the first power supply module 5 and the second power supply module 6 are powered off and self-locked, and the first power supply module 5 and the second power supply module 6 are sequentially restored to supply power; when the first power supply module 5 or the second power supply module 6 is restored to supply power, and the first short circuit signal is received again, the shunt control module 7 disconnects the module with fault from the first power supply module 5 and the second power supply module 6.
[0024] In the actual application process, when short circuit self-detection is needed, power-on control is temporarily performed, and the power supply state is maintained when there is no short circuit.
[0025] Further, the power supply module 1 specifically comprises a power supply interface PWR, a first transformer B1, a voltage regulation device DY, a fourth resistor R4, a first power tube Q1 and a first switch tube V1.
[0026] The input end of the power supply interface PWR is connected with the external AC power supply; the first output end of the power supply interface PWR is connected with the first end of the primary side of the first transformer B1, the first power supply module 5 (a first relay K1) and the second power supply module 6 (a second relay K2) respectively; and the second output end of the power supply interface PWR is connected with the second end of the primary side of the first transformer B1, the first power supply module 5 (the first relay K1) and the second power supply module 6 (the second relay K2) respectively.
[0027] The first end and the second end of the secondary side of the first transformer B1 are coupled to the first end and the second end of the voltage regulating device DY.
[0028] The third end of the voltage regulating device DY is connected to the source of the first power tube Q1 and one end of the fourth resistor R4, respectively.
[0029] The gate of the first power tube Q1 is connected to the other end of the resistor R4 and the collector of the first switch tube V1, respectively; the drain of the first power tube Q1 is connected to the shunt control module 7 (one end of the seventh resistor R7).
[0030] The emitter of the first switch tube V1 is grounded; the base of the first switch tube V1 is connected to the state detection module 4 (the anode of the fifth diode D5).
[0031] Optionally, the voltage regulating device DY can be composed of a rectifier, a filter capacitor and a voltage stabilizer.
[0032] Optionally, the power tube Q1 is a P-channel field effect tube.
[0033] Optionally, the first switch tube N1 is an NPN triode.
[0034] Optionally, the first relay switch K1 and the second relay switch K2 are both double-pole double-throw switches of the normally closed type.
[0035] Further, the voltage detection module 2 comprises a first transformer PT1, a first diode D1, a second diode D2, a first operational amplifier OP1, a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3 and a phase-shifting device YX.
[0036] The first end and the second end of the first transformer PT1 are connected to the first relay switch K1-1 of the first relay K1 and the second relay switch K2-1 of the second relay K2, respectively; the third end of the first transformer PT1 is connected to the cathode of the first diode D1, the anode of the second diode D2, one end of the second resistor R2, one end of the first capacitor C1 and the inverting terminal of the first operational amplifier OP1, respectively; the fourth end of the first transformer PT1, the anode of the first diode D1, the cathode of the second diode D2 and the non-inverting terminal of the first operational amplifier OP1 are all grounded.
[0037] One end of the first resistor is connected to the other end of the first capacitor.
[0038] The other end of the second resistor, the other end of the first resistor R1, the output terminal of the first operational amplifier OP1 and one end of the third resistor R3 are all connected to the input of the phase-shifting device YX.
[0039] The output end of the phase shifting device YX and the other end of the third resistor are connected with the short circuit judging module 3 (the positive phase end of the first comparator A1 and the reverse end of the second comparator A2).
[0040] Optionally, the first mutual inductor PT1 is a current mutual inductor.
[0041] Optionally, the first operational amplifier OP1 is an OP07 operational amplifier, which is powered by positive and negative voltages, and cooperates with the first capacitor C1, the first resistor R1 and the second resistor R2 to perform amplification and filtering processing.
[0042] Optionally, the phase shifting device YX is composed of an operational amplifier, a resistor and a capacitor, which perform 180° phase shifting processing on the input signal, and superimpose the signal transmitted by the third resistor R3, and when the superimposed signal is zero potential, it indicates that the alternating current has not been suddenly changed.
[0043] Further, the state detecting module 4 comprises a first logic chip J1, a first power supply VCC1, a third diode D3, a second logic chip J2, a fourth diode D4 and a fifth diode D5.
[0044] The A end of the first logic chip J1 is connected with the cathode of the third diode D3 and the cathode of the short circuit judging module 3 (the twelfth diode D10) respectively; the Y end of the first logic chip J1 is connected with the anode of the third diode D3, the A end of the second logic chip J2 and the first power supply module 5 (the other end of the fifth resistor R5) respectively; and the B end of the first logic chip J1 is connected with the first power supply VCC1.
[0045] The Y end of the second logic chip J2 is connected with the power supply module 1 (the base of the first switch tube V1) and the anode of the fifth diode D5 respectively; the B end of the second logic chip J2 is connected with the cathode of the fourth diode D4 and the cathode of the fifth diode D5 respectively; and the anode of the fourth diode D4 is connected with the short circuit judging module 3 (the output end of the first inverter INV) and the second power supply module 6 (the B end of the fourth logic chip J4) respectively.
[0046] Optionally, the first logic chip J1 is an AND gate chip, which cooperates with the third diode D3 and the first power supply VCC1 to perform high level self-locking; and the second logic chip J2 is an AND gate chip, which cooperates with the fifth diode D5 and the fourth diode D4 to perform high level self-locking.
[0047] Further, the first power supply module 5 comprises a first relay K1, a second switch tube V2, a sixth diode D6, a fifth resistor R5 and a third logic chip J3.
[0048] The control end of the first relay K1 is connected with the collector of the second switch tube V2 and one end of the fifth resistor R5 respectively; the emitter of the second switch tube V2 is grounded; the base of the second switch tube V2 is connected with the shunt control module 7 (the third end of the first counter IC2), the Y end of the third logic chip J3 and the cathode of the sixth diode D6 respectively; the other end of the fifth resistor R5 is connected with the state detection module 4 (the anode of the third diode D3) and the second power supply module 6 (the other end of the sixth resistor R6) respectively; the first static end and the second static end of the first relay switch K1 are connected with the output module 8 (the first port and the second port).
[0049] The A end of the third logic chip J3 is connected with the state detection module 4 (the anode of the third diode D3) and the second power supply module 6 (the other end of the sixth resistor R6) respectively; the B end of the third logic chip J3 is connected with the anode of the sixth diode D6.
[0050] Optionally, the first relay K1 controls the disconnection of the first relay switch K1-1 (of the first relay K1) in a magnetic attraction manner.
[0051] Optionally, the second switch tube V2 is an NPN type triode.
[0052] Optionally, the third logic chip J3 is an AND gate chip, which can be used for high level self-locking in cooperation with the sixth diode D6.
[0053] Further, the second power supply module 6 comprises a second relay K2, a third switch tube V3, a seventh diode D7, a sixth resistor R6 and a fourth logic chip J4.
[0054] The control end of the second relay K2 is connected with the collector of the third switch tube V3 and one end of the sixth resistor R6 respectively; the emitter of the third switch tube V3 is grounded; the base of the third switch tube V3 is connected with the shunt control module 7 (the second end of the first counter IC2), the cathode of the seventh diode D7 and the A end of the fourth logic chip J4 respectively; the other end of the sixth resistor R6 is connected with the state detection module 4 (the anode of the third diode D3) and the first power supply module 5 (one end of the fifth resistor R5) respectively; the first static end and the second static end of the second relay switch K2 are connected with the output module 8.
[0055] The Y end of the fourth logic chip J4 is connected with the anode of the seventh diode D7, and the B end of the fourth logic chip J4 is connected with the state detection module 4 (the output end of the first inverter INV).
[0056] Optionally, the second relay K2 controls the disconnection of the second relay switch K2-1 (of the second relay K2) in a magnetic attraction manner.
[0057] Optionally, the third switch tube V3 is an NPN type triode.
[0058] Optionally, the fourth logic chip J4 is an AND gate chip, which can cooperate with the seventh diode D7 to perform high-level self-locking.
[0059] Further, as shown in the figure, the short circuit judgment module 3 comprises a first threshold device YZ1, a second threshold device YZ2, a phase shift device YX, a first comparator A1, a second comparator A2, an eighth diode D8, a ninth diode D9, a twelfth diode D10 and a first inverter INV1. Figure 3 The positive terminal of the first comparator A1 is connected with the state detection module 4 (the phase shift device YX), the inverting terminal of the first comparator A1 is connected with the first threshold device YZ1, and the output terminal of the first comparator A1 is connected with the anode of the ninth diode D9.
[0060] The positive terminal of the second comparator A2 is connected with the second threshold device YZ2, the inverting terminal of the second comparator A2 is connected with the state detection module 4 (the phase shift device YX), and the output terminal of the second comparator A2 is connected with the anode of the eighth diode D8.
[0061] The cathode of the ninth diode D9 is connected with the cathode of the eighth diode D8, the anode of the twelfth diode D10 and the input terminal of the first inverter INV1 respectively, the cathode of the twelfth diode is connected with the state detection module 4 (the A terminal of the first logic chip J1), and the output terminal of the first inverter INV1 is connected with the state detection module 4 (the anode of the fourth diode).
[0062] Optionally, the first comparator A1 and the second comparator A2 are both LM358 comparators, the first inverter INV1 is a NOT gate chip, the first threshold device YZ1 can be composed of a positive reference power supply and a resistor to provide a first voltage threshold, and the second threshold device YZ2 can be composed of a negative reference power supply and a resistor to provide a second voltage threshold.
[0063] Further, as shown in the figure, the shunt control module 7 comprises a seventh resistor R7, an eighth resistor R8, a second capacitor C2, a third capacitor C3, a first flip-flop IC1 and a first counter IC2.
[0064] Figure 4 One end of the seventh resistor R7, the fourth end and the eighth end of the first flip-flop IC1 and the sixteenth end of the first counter IC2 are all connected with the power module 1 (the drain of the first power tube Q1);
[0065] The other end of the seventh resistor R7 is respectively connected with one end of the eighth resistor R8 and the seventh end of the first flip-flop IC1.
[0066] The other end of the seventh resistor R7 is respectively connected with one end of the eighth resistor R8 and the seventh end of the first flip-flop IC1.
[0067] The other end of the resistor R8 is connected with the second end and the sixth end of the first flip-flop and one end of the third capacitor C3 respectively.
[0068] The other end of the third capacitor C3, the first end of the first flip-flop IC1, one end of the second capacitor and the eighth end, the thirteenth end, the fifteenth end of the first counter are grounded; the other end of the second capacitor C2 is connected with the fifth end of the first flip-flop IC1.
[0069] The fourteenth end of the first counter IC2 is connected with the third end of the first flip-flop IC1; the second end of the first counter IC2 is connected with the second power supply module 6 (the base of the third switch tube V3); the third end of the first counter IC2 is connected with the first power supply module 5 (the base of the second switch tube V2).
[0070] Optionally, the first flip-flop IC1 is an NE555 integrated chip; and the first counter IC2 is a CD4017 chip.
[0071] Further, the signal conditioning specifically includes sampling, amplification filtering and phase shift superposition processing.
[0072] Further, the preset strategy is that when the potential signal is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold, the judgment result is normal, otherwise, the judgment result is abnormal; and the first voltage threshold is greater than the second voltage threshold.
[0073] Optionally, the second voltage threshold is a negative value and the absolute value of the second voltage threshold is equal to the first voltage threshold. Wherein, the first voltage threshold is used to compare the change degree of the alternating current voltage.
[0074] In the actual application process, the actual working process of the power equipment safety protection circuit is as follows:
[0075] Firstly, the AC power is accessed by the power interface PWR. The AC power is transmitted to the first port and the second port through the first relay switch K1-1 and the second relay switch K2-1 respectively. At the same time, the first transformer B1 and the voltage regulating device DY perform voltage reduction, rectification filtering and voltage stabilization processing on the AC power, and output the power. The first mutual inductor PT1 performs isolated voltage sampling on the AC power. The first diode D1 and the second diode D2 perform input protection. The first operational amplifier OP1 cooperates with the first capacitor C1, the first resistor R1 and the second resistor R2 to perform signal amplification and filtering processing, and outputs the first detection signal. The first detection signal is 180° phase-shifted by the phase-shifting device, and then superimposed with the first detection signal transmitted by the third resistor R3 to output the potential signal. When the AC power does not change suddenly, the potential signal is zero potential. When the potential signal is not zero and greater than the first voltage threshold or the second voltage threshold, the first comparator A1 or the second comparator A2 will output the first control signal, which means that there is a short-circuit current and the circuit is short-circuited. If it is not greater than the first voltage threshold or the second voltage threshold, it means that no short circuit occurs, and the second control signal will be output by the first inverter INV1.
[0076] When a short circuit occurs, the first logic chip J1 cooperates with the third diode D3 and the first power supply VCC1 to self-lock and output the third control signal, control the first relay K1 and the second relay K2 to be powered on, so that the first relay switch K1-1 and the second relay switch K2-1 are disconnected, and power off. If the short circuit disappears at this time, it means that the power interface PWR is normal, and the first port or the second port is short-circuited. At this time, the second logic chip J2 cooperates with the fourth diode D4 and the fifth diode D5 to output the first control signal, and controls the first switch tube N1 to be turned on. The first power tube Q1 is turned on, so that the power supply is powered for the first flip-flop IC1 and the first counter IC2. The first flip-flop IC1 cooperates with the seventh resistor R7, the eighth resistor R8, the third capacitor C3 and the second capacitor C2 to provide a pulse signal for the first counter IC2, so that the third terminal of the first counter IC2 outputs the first self-check signal in the timing time, and controls the second switch tube V2 to be turned on. The first relay K1 loses power, and the first relay switch K1-1 is closed.
[0077] If the short circuit condition is not detected at this time, the third logic chip J3 cooperates with the sixth diode D6 to perform self-locking and continuously controls the second switch tube V2 to be turned on, so that the first relay switch K1-1 re-performs the power transmission work. If the short circuit condition is detected at this time, the first relay switch K1-1 remains in the power-off state after the timing ends and the first self-check signal stops being output. The first counter IC2 outputs the second self-check signal, and the third switch tube V3 is turned on, and the second relay switch K2-1 is closed. Similarly, if the short circuit condition is not detected at this time, the fourth logic chip J4 cooperates with the seventh diode D7 to perform self-locking and continuously controls the third switch tube V3 to be turned on, so that the second relay switch K2-1 re-performs the power transmission work. If the short circuit condition is detected at this time, the second relay switch K2-1 remains in the power-off state after the timing ends and the second self-check signal stops being output.
[0078] The technical effects of the present application are as follows.
[0079] The power supply safety protection circuit of the present application can be supplied in parallel by the first power supply module and the second power supply module. The voltage detection module cooperates with the short circuit judgment module to detect the voltage change and judge the short circuit of the power supply module. When the short circuit occurs, the state detection module controls the first power supply module and the second power supply module to be powered off for protection, and at the same time, the state detection module detects whether the short circuit state still occurs after being powered off. If the short circuit does not occur, it indicates that the power supply module is partially normal, at which time the power supply module is controlled to supply power to the shunt control module, and the shunt control module controls the first power supply module and the second power supply module to appear in turn for power transmission control. When the first power supply module is re-powered, if the short circuit occurs, the first power supply module will be powered off for self-locking, and similarly, if the second power supply module is powered and the short circuit occurs, the second power supply module will be powered off for self-locking, which can accurately disconnect the output branch where the short circuit fault occurs. The present application has a double protection mechanism, which can accurately disconnect the output branch where the short circuit fault occurs, improve the power supply safety of the power equipment, and reduce the monitoring cost.
[0080] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.
[0081] The principles and implementation modes of the present application are described by applying specific examples herein, and the above embodiments are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation modes and application ranges will be changed. In conclusion, the content of the present application should not be understood as a limitation.
Claims
1. An electrical apparatus safety protection circuit, characterized by comprising: The power equipment safety protection circuit comprises a power module 1, a voltage detection module 2, a short-circuit judgment module 3, a state detection module 4, a first power supply module 5, a second power supply module 6, a shunt control module 7 and an output module 8. The power module 1 is connected with an external AC power supply, the voltage detection module 2, the first power supply module 5, the second power supply module 6 and the shunt control module 7 respectively; the power module 1 is used for outputting electric energy after performing voltage reduction, rectification and stabilization on the external AC power supply; The voltage detection module 2 is connected with the short-circuit judgment module 3; the voltage detection module 2 is used for signal conditioning on the external AC power supply and outputting a potential signal; The short-circuit judgment module 3 is connected with the state detection module 4; the short-circuit judgment module 3 is used for performing short-circuit judgment according to a preset strategy based on the potential signal; when the judgment result is abnormal, a first short-circuit signal is sent; when the judgment result is normal, a second control signal is sent; The state detection module 4 is connected with the power module 1, the first power supply module 5 and the second power supply module 6 respectively; when the first short-circuit signal is received, the state detection module 4 is self-locked and outputs a third control signal; after the third control signal is outputted, when the second control signal is received again, the state detection module 4 is self-locked and outputs a first control signal; The shunt control module 7 is connected with the first power supply module 5 and the second power supply module 6 respectively; the first power supply module 5 and the second power supply module 6 are connected with the output module 8; the output module 8 is connected with an external power equipment; when the third control signal is received, the first power supply module 5 and the second power supply module 6 are self-locked; after the first power supply module 5 and the second power supply module 6 are self-locked, the shunt control module 7 outputs a first self-check signal and a second self-check signal in turn according to a timing sequence, and the first power supply module 5 and the second power supply module 6 are sequentially restored to supply power; when the first power supply module 5 or the second power supply module 6 is restored to supply power, and the first short-circuit signal is received again, the shunt control module 7 disconnects the module with fault from the first power supply module 5 and the second power supply module 6.
2. The power device safety protection circuit of claim 1, wherein, The power module specifically comprises a power interface PWR, a first transformer B1, a voltage regulating device DY, a fourth resistor R4, a first power tube Q1 and a first switch tube V1; An input end of the power interface PWR is connected with an external AC power supply; first output ends of the power interface PWR are connected with a first end of a primary side of the first transformer B1, the first power supply module and the second power supply module respectively; second output ends of the power interface PWR are connected with a second end of the primary side of the first transformer B1, the first power supply module and the second power supply module respectively; First and second ends of a secondary side of the first transformer B1 are coupled with first and second ends of the voltage regulating device DY; A third end of the voltage regulating device DY is connected with a source of the first power tube Q1 and one end of the fourth resistor R4 respectively; The gate of the first power tube Q1 is connected with the other end of the resistor R4 and the collector of the first switch tube V1 respectively; the drain of the first power tube Q1 is connected with the shunt control module; The emitter of the first switch tube V1 is grounded, and the base of the first switch tube V1 is connected with the state detection module.
3. The power device safety protection circuit of claim 1, wherein, The voltage detection module comprises a first transformer PT1, a first diode D1, a second diode D2, a first operational amplifier OP1, a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3 and a phase shift device YX. The first end and the second end of the first transformer PT1 are connected with the power module respectively; the third end of the first transformer PT1 is connected with the cathode of the first diode D1, the anode of the second diode D2, one end of the second resistor R2, one end of the first capacitor C1 and the inverting terminal of the first operational amplifier OP1 respectively; the fourth end of the first transformer PT1, the anode of the first diode D1, the cathode of the second diode D2 and the non-inverting terminal of the first operational amplifier OP1 are grounded; One end of the first resistor is connected with the other end of the first capacitor; The other end of the second resistor, the other end of the first resistor R1, the output end of the first operational amplifier OP1 and one end of the third resistor R3 are connected with the input of the phase shift device YX; The output end of the phase shift device YX and the other end of the third resistor are connected with the short circuit judgment module.
4. The power device safety protection circuit of claim 1, wherein, The state detection module comprises a first logic chip J1, a first power supply VCC1, a third diode D3, a second logic chip J2, a fourth diode D4 and a fifth diode D5. The A end of the first logic chip J1 is connected with the cathode of the third diode D3 and the short circuit judgment module respectively; the Y end of the first logic chip J1 is connected with the anode of the third diode D3, the A end of the second logic chip J2 and the first power supply module respectively; the B end of the first logic chip J1 is connected with the first power supply VCC1; The Y end of the second logic chip J2 is connected with the power module and the anode of the fifth diode D5 respectively; the B end of the second logic chip J2 is connected with the cathode of the fourth diode D4 and the cathode of the fifth diode D5 respectively; the anode of the fourth diode D4 is connected with the short circuit judgment module and the second power supply module respectively.
5. The power device safety protection circuit of claim 1, wherein, The first power supply module comprises a first relay K1, a second switch tube V2, a sixth diode D6, a fifth resistor R5 and a third logic chip J3; The control end of the first relay K1 is connected with the collector of the second switch tube V2 and one end of the fifth resistance R5 respectively; the emitter of the second switch tube V2 is grounded; the base of the second switch tube V2 is connected with the shunt control module, the Y end of the third logic chip J3 and the cathode of the sixth diode respectively; the other end of the fifth resistance R5 is connected with the state detection module and the second power supply module respectively; the first static end and the second static end of the first relay switch K1 are connected with the output module; The A end of the third logic chip J3 is connected with the state detection module and the second power supply module respectively; the B end of the third logic chip J3 is connected with the anode of the sixth diode D6.
6. The electrical device safety protection circuit of claim 1, wherein, The second power supply module comprises a second relay K2, a third switch tube V3, a seventh diode D7, a sixth resistance R6 and a fourth logic chip J4; The control end of the second relay K2 is connected with the collector of the third switch tube V3 and one end of the sixth resistance R6 respectively; the emitter of the third switch tube V3 is grounded; the base of the third switch tube V3 is connected with the shunt control module, the cathode of the seventh diode and the A end of the fourth logic chip J4 respectively; the other end of the sixth resistance R6 is connected with the state detection module and the first power supply module respectively; the first static end and the second static end of the second relay switch K2 are connected with the output module; The Y end of the fourth logic chip J4 is connected with the anode of the seventh diode D7, and the B end of the fourth logic chip J4 is connected with the state detection module.
7. The electrical device safety protection circuit of claim 1, wherein, The short circuit judgment module comprises a first threshold device YZ1, a second threshold device YZ2, a phase shift device YX, a first comparator A1, a second comparator A2, an eighth diode D8, a ninth diode D9, a twelfth diode D10 and a first inverter INV1; The positive end of the first comparator A1 is connected with the state detection module, the inverting end of the first comparator A1 is connected with the first threshold device YZ1, and the output end of the first comparator A1 is connected with the anode of the ninth diode D9; The positive end of the second comparator A2 is connected with the second threshold device YZ2, the inverting end of the second comparator A2 is connected with the state detection module, and the output end of the second comparator A2 is connected with the anode of the eighth diode D8; The cathode of the ninth diode D9 is connected with the cathode of the eighth diode D8, the anode of the twelfth diode D10 and the input end of the first inverter INV1 respectively; the cathode of the twelfth diode is connected with the state detection module; the output end of the first inverter INV1 is connected with the state detection module.
8. The electrical device safety protection circuit of claim 1, wherein, The shunt control module comprises a seventh resistance R7, an eighth resistance R8, a second capacitor C2, a third capacitor C3, a first flip-flop IC1 and a first counter IC2; One end of the seventh resistance R7, the fourth end and the eighth end of the first flip-flop IC1 and the sixteenth end of the first counter IC2 are connected with the power supply module; The other end of the seventh resistor R7 is connected with one end of the eighth resistor R8 and the seventh end of the first flip-flop IC1 respectively; The other end of the resistor R8 is connected with the second end and the sixth end of the first flip-flop IC1 and one end of the third capacitor C3 respectively; The other end of the third capacitor C3, the first end of the first flip-flop IC1, one end of the second capacitor and the eighth end, the thirteenth end, the fifteenth end of the first counter are grounded; the other end of the second capacitor C2 is connected with the fifth end of the first flip-flop IC1; The fourteenth end of the first counter IC2 is connected with the third end of the first flip-flop IC1; the second end of the first counter IC2 is connected with the second power supply module; the third end of the first counter IC2 is connected with the first power supply module.
9. The electrical device safety protection circuit of claim 1, wherein, The signal conditioning specifically includes sampling, amplification filtering and phase shift superposition processing.
10. The electrical device safety protection circuit of claim 1, wherein, The preset strategy is that when the potential signal is greater than or equal to the second voltage threshold and less than or equal to the first voltage threshold, the judgment result is normal, otherwise, the judgment result is abnormal. The first voltage threshold is greater than the second voltage threshold.