An electrical fire safety prevention circuit

Abstract

The present invention discloses an electrical fire safety prevention circuit, which relates to the field of electrical protection technology, and includes a power supply control module for electric energy transmission control; a multiple detection module for overvoltage detection and electric energy frequency offset detection, and adjusting the frequency offset detection sensitivity; an abnormality detection module for unbalanced current sensing; an output module for receiving electric energy; a signal gating module for controlling the transmission path of the signal; an intelligent control module for signal reception and module control; a safety protection module for controlling the power supply control module to cut off power when an overvoltage or electric energy frequency offset occurs; and a prevention display module for performing abnormal prevention display when a frequency offset occurs during the frequency offset detection sensitivity period. The electrical fire safety prevention circuit of the present invention can perform leakage detection, overvoltage detection, and electric energy frequency offset detection, and can adjust the electric energy frequency offset detection sensitivity, thereby improving electrical safety and preventing electrical fires.

Description

Technical Field

[0001] The invention relates to the technical field of electrical protection, in particular to an electrical fire safety prevention circuit. Background Art

[0002] As my country's social economy continues to develop, electricity consumption will also increase, the frequency of electrical line fires is getting higher and higher, and fires easily caused by electrical line failures cause certain losses to people's personal safety. In order to avoid electrical fires caused by abnormal power supply, abnormal load, etc., the electrical fire safety prevention circuit in the prior art generally adopts overvoltage detection devices, leakage detection devices, current detection devices and other detection devices to realize the working safety detection of electrical equipment. However, due to too many protection devices, the protection control is complicated, and the electric energy detection sensitivity is limited, and it is impossible to detect in advance whether there is abnormal power supply. The electrical fire safety prevention ability is low, so it needs to be improved. Summary of the invention

[0003] The embodiment of the present invention provides an electrical fire safety prevention circuit to solve the problems raised in the above background technology.

[0004] According to an embodiment of the present invention, there is provided an electrical fire safety prevention circuit, comprising a power control module, a multiple detection module, an abnormality detection module, an output module, an intelligent control module, a signal gating module, a safety protection module and a prevention display module;

[0005] A power control module, connected to the safety protection module and the signal gating module, for receiving and transmitting AC power, and stopping transmission of AC power upon receiving a first protection signal output by the safety protection module or a second abnormal signal output by the signal gating module;

[0006] a multiple detection module connected to the intelligent control module, the power control module and the output module, and used to set an overvoltage threshold, and during the period of receiving the first control signal output by the intelligent control module, jumper the AC power connected to the power control module to the output module and perform frequency offset detection on the AC power, and when the jumper AC power is greater than the overvoltage threshold, output a first overvoltage signal, and when the jumper AC power is greater than the overvoltage threshold or during the period of receiving the first adjustment signal, the second adjustment signal or the third adjustment signal output by the intelligent control module, when the frequency offset of the AC power is detected, generate a first residual current, and adjust the frequency offset detection sensitivity according to the received first adjustment signal, the second adjustment signal or the third adjustment signal;

[0007] an abnormality detection module, connected to the multiple detection module and the power control module, for sensing an unbalanced current of the AC power output by the power control module and outputting a first abnormality signal when the unbalanced current or the first residual current is greater than a set action current threshold;

[0008] an output module, connected to the abnormality detection module, and configured to receive the AC power output by the power control module after passing through the abnormality detection module;

[0009] A signal gating module, connected to the abnormality detection module and the intelligent control module, configured to receive the first abnormality signal and output the second abnormality signal, and stop outputting the second abnormality signal and output the third abnormality signal upon receiving the first switching signal output by the intelligent control module;

[0010] an intelligent control module, connected to the safety protection module, and configured to output a first control signal and a first adjustment signal when the second abnormal signal is not received, receive a first overvoltage signal, and sequentially output a second adjustment signal and a third adjustment signal when the first control signal and the first adjustment signal are output and the first overvoltage signal and the first protection signal output by the safety protection module are not received;

[0011] A safety protection module, connected to the signal gating module and the multiple detection module, configured to output a first protection signal when receiving a first adjustment signal or a first overvoltage signal during a period of receiving a third abnormal signal;

[0012] The prevention display module is connected to the intelligent control module and the signal gating module, and is used to perform abnormal prevention display when the second adjustment signal or the third adjustment signal is received during the period of receiving the third abnormal signal.

[0013] As a further solution of the present invention: the power control module includes an AC interface and a first circuit breaker; the abnormality detection module includes a first mutual inductor, a third resistor, a third capacitor and a first leakage device; the output module includes an output port;

[0014] Preferably, the first end and the second end of the AC interface are respectively connected to the first static end and the second static end of the first circuit breaker, the first moving end and the second moving end of the first circuit breaker both pass through the first mutual inductor and are respectively connected to the first end and the second end of the output port, the control end of the first circuit breaker is connected to the signal selection module and the safety protection module, the first output end of the first mutual inductor is connected to one end of the third resistor and the IN1 end of the first leakage device and is connected to the second output end of the first mutual inductor, the other end of the third resistor and the IN2 end of the first leakage device through the third capacitor, and the OUT end of the first leakage device is connected to the signal selection module.

[0015] As a further solution of the present invention: the signal gating module includes a first power supply, a fourth resistor, a first switch tube, a first analog switch and a second diode; the intelligent control module includes a first controller;

[0016] Preferably, the first power supply is connected to the collector of the first switching tube and the fifth end of the first analog switch through a fourth resistor, the base of the first switching tube is connected to the sixth end of the first analog switch and the IO3 end of the first controller, the emitter of the first switching tube is grounded, the third end and the eighth end of the first analog switch are both connected to the OUT end of the first leakage device, the fourth end of the first analog switch is connected to the IO1 end of the first controller and the anode of the second diode, the cathode of the second diode is connected to the control end of the first circuit breaker, and the ninth end of the first analog switch is connected to the safety protection module and the prevention display module.

[0017] As a further solution of the present invention: the safety protection module includes a third diode, a fifth diode, a fourth diode and a first logic chip;

[0018] Preferably, the anode of the third diode is connected to the IO4 terminal of the first controller, the anode of the fifth diode is connected to the IO7 terminal of the first controller, the cathode of the third diode is connected to the cathode of the fifth diode and the B terminal of the first logic chip, the A terminal of the first logic chip is connected to the ninth terminal of the first analog switch, the Y terminal of the first logic chip is connected to the anode of the fourth diode and the IO8 terminal of the first controller, and the cathode of the fourth diode is connected to the control terminal of the first circuit breaker.

[0019] As a further solution of the present invention: the multiple detection module includes a first diode, a first resistor, a first capacitor, a second capacitor, a first thyristor, a second thyristor, a third thyristor, a fourth thyristor, a fifth thyristor, a second resistor and a first inductor;

[0020] Preferably, the cathode of the first diode is connected to the first end of the first resistor and the first moving end of the first circuit breaker, the anode of the first diode is connected to one end of the fourth thyristor and is connected to the first end of the first inductor through the second capacitor, the second end, the third end and the fourth end of the first inductor are respectively connected to one end of the first thyristor, one end of the second thyristor and one end of the third thyristor, the second end of the first resistor is connected to the control button of the fourth thyristor and is connected to the other end of the first thyristor, the other end of the second thyristor, the other end of the third thyristor, one end of the fifth thyristor and one end of the second resistor through the first capacitor, the other end of the second resistor is connected to the other end of the fourth thyristor, the other end of the fifth thyristor is connected to the second end of the output port, and the control end of the first thyristor, the control end of the second thyristor, the control end of the third thyristor and the control end of the fifth thyristor are respectively connected to the IO4 end, IO5 end, IO6 end and IO2 end of the first controller.

[0021] As a further solution of the present invention: the multiple detection module further includes a first trigger diode, a first optical coupler, a second power supply and a fifth resistor;

[0022] Preferably, one end of the first trigger diode is connected to the first end of the first resistor, the other end of the first trigger diode is connected to the first end of the first optocoupler, the second end of the first optocoupler is connected to the second end of the first resistor, the third end of the first optocoupler is connected to the second power supply, and the fourth end of the first optocoupler is connected to the IO7 end of the first controller and the anode of the fifth diode and grounded through the fifth resistor.

[0023] As a further solution of the present invention: the prevention display module includes a sixth diode, a seventh diode, a second logic chip, a sixth resistor and a first indicator light;

[0024] Preferably, the anode of the sixth diode and the anode of the seventh diode are respectively connected to the IO5 terminal and IO6 terminal of the first controller, the A terminal of the second logic chip is connected to the cathode of the sixth diode and the cathode of the seventh diode, the B terminal of the second logic chip is connected to the ninth terminal of the first analog switch, the Y terminal of the second logic chip is connected to the anode of the first indicator light through the sixth resistor, and the cathode of the first indicator light is grounded.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the electrical fire safety prevention circuit of the present invention can perform leakage detection between the power control module and the output module through the abnormal detection module, and when leakage occurs, control the power control module to perform power-off protection through the signal selection module, when the abnormal detection module stops leakage detection, the multiple detection modules cooperate with the abnormal detection module to perform overvoltage detection and electric energy frequency deviation detection on the electric energy output by the power control module, and when overvoltage or electric energy frequency deviation occurs, control the power control module to perform power-off protection through the signal selection module and the safety protection module, when power-off protection is not performed, the electric energy frequency deviation detection sensitivity in the multiple detection modules can be adjusted, and during the period of increasing detection sensitivity, if frequency deviation occurs, an abnormal display will be performed through the prevention display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 A schematic block diagram of a principle of an electrical fire safety prevention circuit provided by an embodiment of the present invention.

[0028] Figure 2A circuit diagram of an electrical fire safety prevention circuit provided by an embodiment of the present invention.

[0029] Figure 3 A circuit diagram of a multiple detection module provided in an embodiment of the present invention.

[0030] Figure 4 A circuit diagram of a prevention display module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In one embodiment, see Figure 1 , an electrical fire safety prevention circuit, comprising a power control module 1, a multiple detection module 2, an abnormality detection module 3, an output module 4, an intelligent control module 5, a signal gating module 6, a safety protection module 7 and a prevention display module 8;

[0033] Specifically, the power control module 1 is connected to the safety protection module 7 and the signal gating module 6, and is used to access and transmit AC power, and stop transmitting AC power when receiving the first protection signal output by the safety protection module 7 or the second abnormal signal output by the signal gating module 6;

[0034] A multiple detection module 2 is connected to the intelligent control module 5, the power control module 1 and the output module 4, and is used to set an overvoltage threshold. During the period of receiving the first control signal output by the intelligent control module 5, the AC power connected to the power control module 1 is bridged to the output module 4 and the frequency offset detection is performed on the AC power. When the bridged AC power is greater than the overvoltage threshold, a first overvoltage signal is output, and when the bridged AC power is greater than the overvoltage threshold or during the period of receiving the first adjustment signal, the second adjustment signal or the third adjustment signal output by the intelligent control module 5, when the frequency offset of the AC power is detected, a first residual current is generated, and the frequency offset detection sensitivity is adjusted according to the received first adjustment signal, the second adjustment signal or the third adjustment signal;

[0035] an abnormality detection module 3, connected to the multiple detection module 2 and the power control module 1, for sensing an unbalanced current of the AC power output by the power control module 1 and outputting a first abnormality signal when the unbalanced current or the first residual current is greater than a set action current threshold;

[0036] an output module 4, connected to the abnormality detection module 3, and configured to receive the AC power output by the power control module 1 passing through the abnormality detection module 3;

[0037] A signal gating module 6, connected to the abnormality detection module 3 and the intelligent control module 5, for receiving the first abnormality signal and outputting the second abnormality signal, and stopping outputting the second abnormality signal and outputting the third abnormality signal when receiving the first switching signal output by the intelligent control module 5;

[0038] The intelligent control module 5 is connected to the safety protection module 7, and is used to output the first control signal and the first adjustment signal when the second abnormal signal is not received, receive the first overvoltage signal, and output the second adjustment signal and the third adjustment signal in sequence when the first control signal and the first adjustment signal are output and the first overvoltage signal and the first protection signal output by the safety protection module 7 are not received;

[0039] A safety protection module 7, connected to the signal gating module 6 and the multiple detection module 2, and configured to output a first protection signal when receiving a first adjustment signal or a first overvoltage signal during a period of receiving a third abnormal signal;

[0040] The prevention display module 8 is connected to the intelligent control module 5 and the signal gating module 6, and is used for performing abnormal prevention display when the second adjustment signal or the third adjustment signal is received during the period of receiving the third abnormal signal.

[0041] In a specific embodiment, the power control module 1 may adopt a power control circuit composed of an AC interface and a circuit breaker, which may be connected to AC power and control the transmission of AC power; the multiple detection module 2 may adopt a multiple detection circuit composed of a trigger diode, a photocoupler, a thyristor, an adjustable inductor, etc., which may perform overvoltage detection and power frequency deviation detection on the AC power between the power control module 1 and the output module 4, and may adjust the power frequency detection sensitivity; the abnormality detection module 3 may adopt an abnormality detection circuit composed of a current transformer, a resistor, a leakage detection device, etc., set an action current threshold, perform unbalanced current detection on the AC power between the power control module 1 and the output module 4, and when the detected unbalanced current exceeds the set action current threshold, that is, when leakage, overvoltage or power frequency deviation occurs, a first abnormal signal in a high level state is output; the output module Block 4 can adopt an output circuit composed of output ports to connect to electrical equipment and receive electric energy; the above-mentioned intelligent control module 5 can adopt an intelligent control circuit composed of a single-chip microcomputer, which integrates many components such as an arithmetic unit, a controller, a memory, and an input and output device to realize functions such as signal processing, data storage, module control, and timing control; the above-mentioned signal selection module 6 can adopt a signal selection circuit composed of analog switches, resistors, transistors, etc., which can control signal transmission and switch the signal transmission path; the above-mentioned safety protection module 7 can adopt a safety protection circuit composed of diodes and logic chips, which outputs a high-level state signal when overvoltage or electric energy frequency deviation occurs; the above-mentioned prevention display module 8 can adopt a prevention display circuit composed of diodes, logic chips, indicator lights, etc., and when the electric energy frequency deviation occurs during the period of improving the detection sensitivity of electric energy frequency deviation, an abnormal protection display will be performed.

[0042] In another embodiment, see Figure 1 , Figure 2 , Figure 3 and Figure 4 , the power control module 1 includes an AC interface and a first circuit breaker K1; the abnormality detection module 3 includes a first mutual inductor ZCT1, a third resistor R3, a third capacitor C3 and a first leakage device U2; the output module 4 includes an output port;

[0043] Specifically, the first end and the second end of the AC interface are respectively connected to the first static end and the second static end of the first circuit breaker K1, the first moving end and the second moving end of the first circuit breaker K1 both pass through the first transformer ZCT1 and are respectively connected to the first end and the second end of the output port, the control end of the first circuit breaker K1 is connected to the signal selection module 6 and the safety protection module 7, the first output end of the first transformer ZCT1 is connected to one end of the third resistor R3 and the IN1 end of the first leakage device U2, and is connected to the second output end of the first transformer ZCT1, the other end of the third resistor R3 and the IN2 end of the first leakage device U2 through the third capacitor C3, and the OUT end of the first leakage device U2 is connected to the signal selection module 6.

[0044] In a specific embodiment, the circuit breaker in the first circuit breaker K1 adopts a double-pole double-throw normally closed switch. When the control end of the first circuit breaker K1 becomes a high level, the circuit breaker is disconnected; the first transformer ZCT1 can be a current transformer; the first leakage device U2 can be a VG54123 leakage detection device, which has an internal operating current threshold. When the input current exceeds the operating current threshold, it self-locks and outputs a first abnormal signal.

[0045] Furthermore, the signal gating module 6 includes a first power supply VCC1, a fourth resistor R4, a first switch tube V1, a first analog switch U3 and a second diode D2; the intelligent control module 5 includes a first controller U1;

[0046] Specifically, the first power supply VCC1 is connected to the collector of the first switch tube V1 and the fifth end of the first analog switch U3 through the fourth resistor R4, the base of the first switch tube V1 is connected to the sixth end of the first analog switch U3 and the IO3 end of the first controller U1, the emitter of the first switch tube V1 is grounded, the third end and the eighth end of the first analog switch U3 are both connected to the OUT end of the first leakage device U2, the fourth end of the first analog switch U3 is connected to the IO1 end of the first controller U1 and the anode of the second diode D2, the cathode of the second diode D2 is connected to the control end of the first circuit breaker K1, and the ninth end of the first analog switch U3 is connected to the safety protection module 7 and the prevention display module 8.

[0047] In a specific embodiment, the first analog switch U3 may be a CD4066 analog switch; the first switch tube V1 may be an NPN transistor; and the first controller U1 may be an NPN transistor.

[0048] Further, the safety protection module 7 includes a third diode D3, a fifth diode D5, a fourth diode D4 and a first logic chip J1;

[0049] Specifically, the anode of the third diode D3 is connected to the IO4 terminal of the first controller U1, the anode of the fifth diode D5 is connected to the IO7 terminal of the first controller U1, the cathode of the third diode D3 is connected to the cathode of the fifth diode D5 and the B terminal of the first logic chip J1, the A terminal of the first logic chip J1 is connected to the ninth terminal of the first analog switch U3, the Y terminal of the first logic chip J1 is connected to the anode of the fourth diode D4 and the IO8 terminal of the first controller U1, and the cathode of the fourth diode D4 is connected to the control terminal of the first circuit breaker K1.

[0050] In a specific embodiment, the first logic chip J1 can be an AND gate chip.

[0051] Further, the multiple detection module 2 includes a first diode D1, a first resistor R1, a first capacitor C1, a second capacitor C2, a first thyristor S1, a second thyristor S2, a third thyristor S3, a fourth thyristor S4, a fifth thyristor S5, a second resistor R2 and a first inductor L1;

[0052] Specifically, the cathode of the first diode D1 is connected to the first end of the first resistor R1 and the first moving end of the first circuit breaker K1, the anode of the first diode D1 is connected to one end of the fourth thyristor S4 and is connected to the first end of the first inductor L1 through the second capacitor C2, the second end, the third end and the fourth end of the first inductor L1 are respectively connected to one end of the first thyristor S1, one end of the second thyristor S2 and one end of the third thyristor S3, the second end of the first resistor R1 is connected to the control button of the fourth thyristor S4 and is connected to the first thyristor S3 through the first capacitor C1. The other end of the silicon S1, the other end of the second thyristor S2, the other end of the third thyristor S3, one end of the fifth thyristor S5 and one end of the second resistor R2, the other end of the second resistor R2 is connected to the other end of the fourth thyristor S4, the other end of the fifth thyristor S5 is connected to the second end of the output port, the control end of the first thyristor S1, the control end of the second thyristor S2, the control end of the third thyristor S3 and the control end of the fifth thyristor S5 are respectively connected to the IO4 end, IO5 end, IO6 end and IO2 end of the first controller U1.

[0053] In a specific embodiment, the first inductor L1 may be an adjustable inductor; the first thyristor S1, the second thyristor S2, the third thyristor S3, the fourth thyristor S4 and the fifth thyristor S5 may be bidirectional thyristors.

[0054] Furthermore, the multiple detection module 2 also includes a first trigger diode VD1, a first optical coupler U4, a second power supply VCC2 and a fifth resistor R5;

[0055] Specifically, one end of the first trigger diode VD1 is connected to the first end of the first resistor R1, the other end of the first trigger diode VD1 is connected to the first end of the first optocoupler U4, the second end of the first optocoupler U4 is connected to the second end of the first resistor R1, the third end of the first optocoupler U4 is connected to the second power supply VCC2, and the fourth end of the first optocoupler U4 is connected to the IO7 end of the first controller U1 and the anode of the fifth diode D5 and is grounded through the fifth resistor R5.

[0056] In a specific embodiment, the first trigger diode VD1 may be a high-voltage trigger diode for overvoltage detection; the first optical coupler U4 may be TLP620.

[0057] Further, the prevention display module 8 includes a sixth diode D6, a seventh diode D7, a second logic chip J2, a sixth resistor R6 and a first indicator LED1;

[0058] Specifically, the anode of the sixth diode D6 and the anode of the seventh diode D7 are respectively connected to the IO5 terminal and IO6 terminal of the first controller U1, the A terminal of the second logic chip J2 is connected to the cathode of the sixth diode D6 and the cathode of the seventh diode D7, the B terminal of the second logic chip J2 is connected to the ninth terminal of the first analog switch U3, the Y terminal of the second logic chip J2 is connected to the anode of the first indicator light LED1 through the sixth resistor R6, and the cathode of the first indicator light LED1 is grounded.

[0059] In a specific embodiment, the second logic chip J2 may be an AND gate chip; the first indicator light LED1 may be an LED.

[0060] In an electrical fire safety prevention circuit of the present embodiment, AC power is connected by an AC interface, and the first circuit breaker K1 transmits the AC power to the output port. The first transformer ZCT1 performs unbalanced current detection on the AC power transmitted between the first circuit breaker K1 and the output port. When leakage occurs, the first transformer ZCT1 detects the unbalanced current and transmits it to the first leakage device U2. When the detected unbalanced current is greater than the set action current threshold, the first leakage device U2 outputs a high-level signal, i.e., a first abnormal signal, and transmits it through the third and fourth terminals of the first analog switch U3, triggering the first circuit breaker K1 to perform power-off control, thereby avoiding electrical fires caused by leakage. When the first leakage device U2 does not detect leakage, the first circuit breaker K1 is disconnected from the output port. When the IO2 terminal of the first control outputs the first control signal and controls the fifth thyristor S5 to be turned on, the IO4 terminal of the first controller U1 outputs the first adjustment signal and controls the first thyristor S1 to be turned on, and the multiple detection module 2 is connected between the power control module 1 and the output module 4, and the overvoltage detection is performed through the first trigger diode VD1. When overvoltage occurs, the first optical coupler U4 and the fourth thyristor S4 are turned on, and the fourth thyristor S4 is turned on so that the first mutual inductor ZCT1 detects the unbalanced current, and the first leakage device U2 will output the first abnormal signal. The first abnormal signal triggers the A terminal of the first logic chip J1 to become a high level through the eighth and ninth terminals of the first analog switch U3, and the first optical coupler U4 is turned on so that the first controller U1 obtains The first logic chip J1 is detected to have an overvoltage and the B terminal is controlled to be high level. The Y terminal of the first logic chip J1 will output a signal of high level state, i.e., the first protection signal, and control the first circuit breaker K1 to cut off the power. In addition, the first thyristor S1 is turned on, and the frequency deviation of the AC power is detected in cooperation with the first resistor R1, the first capacitor C1, the first diode D1, the second capacitor C2, the first inductor L1, the fourth thyristor S4 and the second resistor R2. When the frequency deviates from the resonance point, the first mutual inductor ZCT1 detects the unbalanced current, which is then transmitted by the first analog switch U3, triggering the first logic chip J1 to control the first circuit breaker K1 to cut off the power. During the conduction period of the first thyristor S1, if the Y terminal of the first logic chip J1 does not output the first A protection signal is sent and the first optocoupler U4 is not turned on, the IO5 and IO6 terminals of the first controller U1 will output the second adjustment signal and the third adjustment signal in sequence, respectively controlling the conduction of the second thyristor S2 and the third thyristor S3, and then adjusting the inductance value of the first inductor L1 to improve the detection accuracy of the electric energy frequency. During the conduction of the second thyristor S2 or the conduction of the third thyristor S3, as long as the electric energy frequency deviation occurs, the Y terminal of the second logic chip J2 will output a high level, and the first indicator LED1 will be lit. If the AC power between the power control module 1 and the output module 4 does not have an overvoltage or electric energy frequency deviation, the IO3 terminal of the first controller U1 will stop outputting the first switching signal, and the IO2 terminal of the first controller U1 will stop the first control signal.The first mutual inductor ZCT1 cooperates with the first leakage detection device, the third resistor R3 and the third capacitor C3 to perform leakage detection.

[0061] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0062] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An electrical fire safety prevention circuit, characterized in that: The electrical fire safety prevention circuit comprises: a power control module, a multiple detection module, an abnormality detection module, an output module, an intelligent control module, a signal gating module, a safety protection module and a prevention display module; The power control module is connected to the safety protection module and the signal gating module, and is used to receive and transmit AC power, and stop transmitting AC power when receiving a first protection signal output by the safety protection module or a second abnormal signal output by the signal gating module; The multiple detection module is connected to the intelligent control module, the power control module and the output module, and is used to set an overvoltage threshold. During the period of receiving the first control signal output by the intelligent control module, the AC power connected to the power control module is bridged to the output module and the frequency offset detection is performed on the AC power. When the bridged AC power is greater than the overvoltage threshold, a first overvoltage signal is output. When the bridged AC power is greater than the overvoltage threshold or during the period of receiving the first adjustment signal, the second adjustment signal or the third adjustment signal output by the intelligent control module, when the frequency offset of the AC power is detected, a first residual current is generated, and the frequency offset detection sensitivity is adjusted according to the received first adjustment signal, the second adjustment signal or the third adjustment signal. The abnormality detection module is connected to the multiple detection module and the power control module, and is used to sense the unbalanced current of the AC power output by the power control module and output a first abnormality signal when the unbalanced current or the first residual current is greater than a set action current threshold; The output module is connected to the abnormality detection module and is used to receive the AC power output by the power control module after passing through the abnormality detection module; The signal gating module is connected to the abnormality detection module and the intelligent control module, and is used to receive the first abnormality signal and output the second abnormality signal, and when receiving the first switching signal output by the intelligent control module, stops outputting the second abnormality signal and outputs the third abnormality signal; The intelligent control module is connected to the safety protection module, and is used to output the first control signal and the first adjustment signal when the second abnormal signal is not received, receive the first overvoltage signal, and output the second adjustment signal and the third adjustment signal in sequence when the first control signal and the first adjustment signal are output and the first overvoltage signal and the first protection signal output by the safety protection module are not received; The safety protection module is connected to the signal gating module and the multiple detection module, and is used to output a first protection signal when receiving the first adjustment signal or the first overvoltage signal during the period of receiving the third abnormal signal; The prevention display module is connected to the intelligent control module and the signal gating module, and is used to perform abnormal prevention display when the second adjustment signal or the third adjustment signal is received during the period of receiving the third abnormal signal.

2. An electrical fire safety prevention circuit according to claim 1, characterized in that: The power control module includes an AC interface and a first circuit breaker; the abnormality detection module includes a first mutual inductor, a third resistor, a third capacitor and a first leakage device; the output module includes an output port; The first end and the second end of the AC interface are respectively connected to the first static end and the second static end of the first circuit breaker, the first moving end and the second moving end of the first circuit breaker pass through the first mutual inductor and are respectively connected to the first end and the second end of the output port, the control end of the first circuit breaker is connected to the signal selection module and the safety protection module, the first output end of the first mutual inductor is connected to one end of the third resistor and the IN1 end of the first leakage device, and is connected to the second output end of the first mutual inductor, the other end of the third resistor and the IN2 end of the first leakage device through the third capacitor, and the OUT end of the first leakage device is connected to the signal selection module.

3. An electrical fire safety prevention circuit according to claim 2, characterized in that: The signal gating module includes a first power supply, a fourth resistor, a first switch tube, a first analog switch and a second diode; the intelligent control module includes a first controller; The first power supply is connected to the collector of the first switching tube and the fifth end of the first analog switch through the fourth resistor, the base of the first switching tube is connected to the sixth end of the first analog switch and the IO3 end of the first controller, the emitter of the first switching tube is grounded, the third end and the eighth end of the first analog switch are both connected to the OUT end of the first leakage device, the fourth end of the first analog switch is connected to the IO1 end of the first controller and the anode of the second diode, the cathode of the second diode is connected to the control end of the first circuit breaker, and the ninth end of the first analog switch is connected to the safety protection module and the prevention display module.

4. An electrical fire safety prevention circuit according to claim 3, characterized in that: The safety protection module includes a third diode, a fifth diode, a fourth diode and a first logic chip; The anode of the third diode is connected to the IO4 terminal of the first controller, the anode of the fifth diode is connected to the IO7 terminal of the first controller, the cathode of the third diode is connected to the cathode of the fifth diode and the B terminal of the first logic chip, the A terminal of the first logic chip is connected to the ninth terminal of the first analog switch, the Y terminal of the first logic chip is connected to the anode of the fourth diode and the IO8 terminal of the first controller, and the cathode of the fourth diode is connected to the control terminal of the first circuit breaker.

5. An electrical fire safety prevention circuit according to claim 4, characterized in that: The multiple detection module includes a first diode, a first resistor, a first capacitor, a second capacitor, a first thyristor, a second thyristor, a third thyristor, a fourth thyristor, a fifth thyristor, a second resistor and a first inductor; The cathode of the first diode is connected to the first end of the first resistor and the first moving end of the first circuit breaker, the anode of the first diode is connected to one end of the fourth thyristor and is connected to the first end of the first inductor through the second capacitor, the second end, the third end and the fourth end of the first inductor are respectively connected to one end of the first thyristor, one end of the second thyristor and one end of the third thyristor, the second end of the first resistor is connected to the control end of the fourth thyristor and is connected to the other end of the first thyristor, the other end of the second thyristor, the other end of the third thyristor, one end of the fifth thyristor and one end of the second resistor through the first capacitor, the other end of the second resistor is connected to the other end of the fourth thyristor, the other end of the fifth thyristor is connected to the second end of the output port, and the control end of the first thyristor, the control end of the second thyristor, the control end of the third thyristor and the control end of the fifth thyristor are respectively connected to the IO4 end, IO5 end, IO6 end and IO2 end of the first controller.

6. An electrical fire safety prevention circuit according to claim 5, characterized in that: The multiple detection module also includes a first trigger diode, a first optical coupler, a second power supply and a fifth resistor; One end of the first trigger diode is connected to the first end of the first resistor, the other end of the first trigger diode is connected to the first end of the first optocoupler, the second end of the first optocoupler is connected to the second end of the first resistor, the third end of the first optocoupler is connected to the second power supply, and the fourth end of the first optocoupler is connected to the IO7 end of the first controller and the anode of the fifth diode and grounded through the fifth resistor.

7. An electrical fire safety prevention circuit according to claim 3, characterized in that: The prevention display module includes a sixth diode, a seventh diode, a second logic chip, a sixth resistor and a first indicator light; The anode of the sixth diode and the anode of the seventh diode are respectively connected to the IO5 terminal and the IO6 terminal of the first controller, the A terminal of the second logic chip is connected to the cathode of the sixth diode and the cathode of the seventh diode, the B terminal of the second logic chip is connected to the ninth terminal of the first analog switch, the Y terminal of the second logic chip is connected to the anode of the first indicator light through the sixth resistor, and the cathode of the first indicator light is grounded.

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