A multifunctional leakage detection and protection circuit device

Abstract

The application discloses a multifunctional electric leakage detection and protection circuit device, which comprises an induction coil, a grounding fault detection circuit, a tripping device, a rectifier bridge circuit, a thyristor, a clamping diode, a resistor, a capacitor, and a test button. The grounding fault detection circuit comprises an amplifier, a filter, a rectifier, a detector, an integrator, a comparator, an oscillator, a counter, a control circuit, a pulse generator, a reset circuit, a latch, a drive mode selector, a band gap reference, a voltage stabilizer, a tripping driver, and an acousto-optic-electric driver. The induction coil is used for inductively acquiring a grounding fault leakage current signal. The grounding fault detection circuit is used for amplifying, filtering, rectifying, detecting, integrating, comparing and judging, latching, and the like, of the grounding fault leakage signal acquired by the induction coil, and controlling generation of an output tripping driving signal and an acousto-optic-electric driving signal.

Description

Technical Field

[0001] The invention relates to a leakage detection protection circuit device. Background Art

[0002] The development of the global economy and advancements in semiconductor and electronics technology have rapidly driven the adoption of intelligent electronic and electrical devices. As a result, more and more household and industrial appliances are becoming commonplace and widely used. Residual current operated circuit breakers (RCCBs) are a crucial protective device in low-voltage power distribution systems, preventing electric shock accidents, ensuring the personal safety of electricity users, and avoiding property damage caused by electric shock. However, in practice, most existing products rely solely on output-driven tripping devices to disconnect branch load power. Since circuit breakers generally lack real-time operating status monitoring, without other alarm methods, faults can go undetected, uncorrected, and restored to normal operation for extended periods of time.

[0003] At the same time, in the actual use of residual current operated circuit breaker products, when a leakage accident occurs, if the trip device fails to cut off the load in time and eliminate the leakage input signal of the leakage detection circuit due to factors such as failure, aging, or mechanical fatigue caused by long-term use, as well as dust, the output drive of the leakage detection circuit will trigger the conduction of the thyristor and the trip device coil for a long time, which may easily cause the thyristor, trip coil, etc. to be overheated or burned due to the long-term high current conduction, and even cause electrical fire accidents. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems that the above-mentioned existing technologies and ground fault protection devices have no other leakage alarm methods such as sound and light in addition to driving the tripping device, and that long-term driving output causes the thyristor, tripping coil and other devices in the tripping circuit to melt or burn out, and to provide a multifunctional leakage detection protection circuit device.

[0005] In order to solve the above technical problems, the present invention provides a multifunctional leakage detection and protection circuit device, comprising: an induction coil, a ground fault detection circuit, a trip unit, a rectifier bridge circuit, a thyristor, a clamping diode, a resistor, a capacitor, and a test button;

[0006] The induction coil is used to sense and obtain a ground fault leakage current signal; the ground fault detection circuit is used to amplify, filter, rectify, detect, integrate, compare, judge, and latch the ground fault leakage signal obtained by the induction coil, and control the generation of output trip drive and sound and light drive signals;

[0007] The signal input end of the multifunctional leakage detection and protection circuit device inputs the ground fault leakage current signal, and the signal output end is used to output a control signal to drive the release device to cut off the load power supply and drive the sound and light alarm device to send an alarm signal when a ground fault occurs.

[0008] In a preferred embodiment, the ground fault detection circuit includes: an amplifier, a filter, a rectifier, a detector, an integrator, a comparator, an oscillator, a counter, a control circuit, a pulse generator, a reset circuit, a latch, a drive mode selector, a bandgap reference, a voltage regulator, a trip driver, and an acoustic and optical driver.

[0009] In a preferred embodiment, the amplifier is used to amplify the ground fault leakage signal obtained by the induction coil.

[0010] In a preferred embodiment: the filter is used to filter out high-frequency interference signals.

[0011] In a preferred embodiment, the rectifier is used to flip the negative half-cycle signal of the AC signal into a positive half-cycle signal.

[0012] In a preferred embodiment, the detector is used to detect and process the signal after filtering and rectification, compare it with a reference voltage value and output the comparison result.

[0013] In a preferred embodiment: the integrator is used to start charging the capacitor through the voltage source / current source when the output of the detector is valid; the comparator compares the output integrated voltage value of the integrator with the reference voltage value, and the comparison result serves as the input signal of the latch and the control circuit; the latch locks the output result of the comparator when the comparator outputs a valid high-level signal.

[0014] In a preferred embodiment, the control circuit is used to control the internal logic of the system and the coordinated operation of each module circuit, and to control and enable the operation of the integrator, counter, pulse generator, latch, trip driver and acoustic and optical driver.

[0015] In a preferred embodiment: the drive mode selector is used to control the selection of continuous pulse output or single pulse output mode to control the output of the tripping driver.

[0016] In a preferred embodiment, the bandgap reference is used to generate a stable bandgap reference source that is independent of temperature and voltage, providing an ideal constant voltage reference source and current source for the circuit.

[0017] In a preferred embodiment, the reset circuit is used to generate a power-on reset signal to enable each module circuit to start normal operation.

[0018] In a preferred embodiment, the voltage stabilizer is used to stabilize the external input DC power supply and provide a constant power supply voltage to the internal circuit.

[0019] In a preferred embodiment: the pulse generator is used to generate a pulse signal for controlling the output of the acousto-optical drive.

[0020] In a preferred embodiment, the tripping driver is used to control and drive the tripping device.

[0021] In a preferred embodiment: the acousto-optical driver is used to control and drive the acousto-optical device.

[0022] In a preferred embodiment, when a leakage fault occurs in the multifunctional leakage detection and protection circuit device, the induction coil senses the residual current and amplifies it through the amplifier, the filter filters out interference and high-frequency clutter signals, and then sends it to the rectifier. The rectifier rectifies the AC leakage signal and flips the negative half-wave cycle signal for subsequent signal detection and processing. The detector receives the output signal of the rectifier and performs signal detection, signal processing and comparison. By comparing it with a reference voltage value, when the signal exceeds the reference voltage value, the detector outputs a high-level signal and sends it to the integrator input port.

[0023] The integrator receives the detector output signal. When it is high, the integrator is enabled to start charging the capacitor. At the same time, the capacitor charging end is also connected to the input end of the comparator and compared with the reference voltage. When the integrator charges the capacitor to a value higher than the reference voltage, the comparator outputs a high level and triggers the latch to lock the high level output. At the same time, the counter starts counting:

[0024] 1) When the counter counts to the set value, the comparator output level value is detected at this time. When the comparator output level is still high, the counter continues to count and the latch output remains high;

[0025] 2) When the counter counts to the set value, the comparator output level value is detected at this time. When the comparator output level is low, the counter stops counting and resets, and the latch output changes from high level to low level output.

[0026] In a preferred embodiment, the output of the latch is connected to the input of the drive mode selector:

[0027] 1) When the output drive mode is continuous pulse output, the latch controls the trip driver to output a continuous pulse signal, that is, when a valid leakage signal is detected, the drive signal can be continuously / repeatedly output;

[0028] 2) When the output drive mode is single pulse output, in each power-on reset cycle, when the comparator outputs a high level, the latch controls the trip driver to output a fixed-period single pulse signal, that is, it only outputs a fixed pulse drive signal once;

[0029] In a preferred embodiment: the output of the latch is also connected to a pulse generator, when the output of the latch is high, the pulse generator is enabled by the control circuit to provide periodic square wave pulse signals, and the control circuit controls the acousto-optic driver to output periodic square wave pulse drive signals.

[0030] In a preferred embodiment: the voltage stabilizer is used to stabilize the external supply voltage VDD, when the external supply voltage VDD gradually rises from 0V to the system's lowest working voltage, the voltage stabilizer starts to work normally, provides stable voltage to the system's circuits, and outputs a signal to the reset circuit to generate a power-on reset enable signal to enable the internal circuits to start working;

[0031] When the external supply voltage VDD continues to rise above the set voltage stabilizing value, the internal OVP overvoltage protection circuit of the voltage stabilizer starts to work, so that the VDD voltage is maintained at the set voltage stabilizing value, for example, around 5V, and the voltage stabilizer also provides stable DC power supply to the internal circuit modules;

[0032] When the external supply voltage VDD drops below the lowest working voltage from a normal voltage value higher than the lowest working voltage, the voltage stabilizer circuit triggers the power-on reset enable signal to be invalid, and the internal circuits stop working to avoid false output caused by excessively low voltage.

[0033] In a preferred embodiment: the bandgap circuit is used to generate stable reference voltage and current sources independent of process, temperature and voltage, and to provide constant ideal reference voltages such as VREF and DC bias currents to the circuit modules.

[0034] In a preferred embodiment: the oscillator circuit is used to generate and provide the system's internal clock CLK reference signal; the oscillator output is also provided to the counter as a counting reference clock input signal; the oscillator output is also provided to the pulse generator as the initial pulse generation clock signal of the pulse generator, so as to generate effective pulse square wave signals to drive the acousto-optic device to issue an alarm signal.

[0035] In a preferred embodiment: the control circuit is used to control, data operation, data analysis, data judgment, coordination, enable the functions of the circuit modules to work together, monitor and process the system input and output ports and internal various signal logic states and results, and issue operation instructions.

[0036] In a preferred embodiment: the trip driver is used to drive the trip actuator, such as driving the silicon-controlled gate to trigger the silicon-controlled silicon to conduct, and thus making the tripper circuit have current conduction and triggering the start to execute the cut-off of the load power supply, and removing the existing dangerous fault.

[0037] In a preferred embodiment: the pulse generator is used to process the initial clock signal provided by the oscillator through the control circuit to generate a square wave pulse signal with a predetermined period and duty cycle, and use it as the input signal of the acoustic and optical driver.

[0038] In a preferred embodiment: the acousto-optical driver is used to generate a periodic driving signal to drive the acousto-optical device to work, such as driving a light-emitting diode to light up or flash;

[0039] The driving signal generated by the acousto-optical driver can be voltage driven or current driven.

[0040] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0041] The present invention discloses a multifunctional leakage detection protection circuit device. Compared with the existing technology and leakage detection protection device, it solves the problem of product application loopholes that simply rely on driving a tripper to trip and cut off the load without other sound and light alarm reminder functions; at the same time, by optionally adopting a single pulse triggering method, it ensures that the driving actuator trips and solves the problem that thyristors, tripping coils, etc. are easily melted or burned due to long-term high current conduction during actual use or testing of residual current operated circuit breaker products, and even cause electrical fire accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a block diagram of the internal principle of the ground fault detection circuit of the present invention;

[0043] Figure 2 This is an application principle diagram of the multifunctional leakage detection and protection circuit device described in the present invention. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] refer to Figure 1 This embodiment provides a ground fault detection circuit 100, as shown in FIG1 , including: an amplifier 101, a filter 102, a rectifier 103, a detector 104, an integrator 105, a comparator 106, a latch 107, a drive mode selector 108, a bandgap reference 109, an oscillator 110, a counter 111, a trip driver 112, a reset circuit 113, a control circuit 114, a voltage regulator 115, a pulse generator 116, and an acoustic and optical driver.

[0048] refer to Figure 2 This embodiment provides a multifunctional leakage detection and protection circuit device. The ground fault detection circuit is a 100:100 circuit in which I NP and I NN are respectively connected to capacitor C3. I NP and I NN are also connected to one end of resistors R4 and R5. The other end of resistor R4 is respectively connected to the anode of diode D1 and the cathode of D2, and the other end of resistor R5 is respectively connected to the cathode of diode D1 and the anode of D2. Diodes D1, D2, and resistor R3 are connected in parallel with the secondary of induction coil 1.

[0049] The OA port of the ground fault detection circuit 100 is connected to the capacitor C0, and the other end of the capacitor C0 is grounded to GND; the OS port of 100 is connected to the trigger port of the thyristor SCR1, and the OS port is also connected to the capacitor C4, and the other end of the capacitor C4 is grounded to GND; the DLY port of 100 is connected to the capacitor C1, and the other end of the capacitor C1 is grounded to GND; the anode end of the thyristor SCR1 is connected to one end of the solenoid of the trip device, and the cathode of the thyristor SCR1 is grounded to GND;

[0050] The DRV port of the ground fault detection circuit 100 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the anode of the LED, and the cathode of the LED is grounded GND;

[0051] The VDD port of the ground fault detection circuit 100 is connected to one end of the capacitor C2, the VDD port is also connected to one end of the resistor R6, and the other end of the capacitor C2 is connected to the ground port GND;

[0052] One end of the solenoid of the trip device is connected to the anode of the thyristor SCR1, and the other end of the solenoid is connected to Hot; Load Hot and Load Neutra l at the power supply end and the load end are connected to the two ends of the trip device switch.

[0053] The rectifier circuit 200 includes diodes D3, D4, D5, D6 and a resistor R6; wherein the anodes of D3 and D5 are grounded, the cathodes of D3 and D4 are connected to Hot, the cathodes of D4 and D6 are connected to one end of R6, and the cathode of D5 and D6 are connected to Neutra l.

[0054] The manual test button 300 includes a current limiting resistor R0 and a test switch RESET, one end of the resistor R0 is connected to the test switch RESET, the other end of the resistor R0 is connected to Neutra 1, and the other end of the test switch RESET is connected to Hot.

[0055] With the above configuration, after power is applied, the secondary induced current of induction coil Coil 1 is converted into a voltage difference via R3. D1 and D2 are connected in parallel across R3 in opposite directions, limiting the voltage to below 1V. R4, R5, and C3 form a filter circuit. The differential voltage value obtained from the sensed ground fault current is then sent to the INP and INN ports for internal processing within ground fault detection circuit 100. Ground fault detection circuit 100 amplifies, filters, and rectifies the input differential voltage signal to generate an OA signal. Capacitor C0 filters OA to suppress high-frequency interference signals. OA serves as the detector input signal for detection and processing. When the signal peak value and / or effective value meet a preset threshold, the integrator begins operation and integrates and charges capacitor C1 via the DLY port. The voltage at the DLY port serves as the input comparison signal for the comparator, which is compared with the reference voltage VREF. When the integrated voltage at the DLY port exceeds the reference voltage VREF, the comparator outputs a high level, which is latched as the input signal by the latch.

[0056] The latch outputs a latch signal, and the drive mode selector generates a drive enable signal based on the set drive mode. The trip driver's OS port output drives the gate of SCR1, triggering SCR1 to conduct. Capacitor C4 is connected to the OS port and the SCR1 gate, with the other end grounded. Capacitor C4 acts as a filter, suppressing interference signals and preventing malfunctions.

[0057] When the driving mode selector 108 is set to the continuous pulse output mode, the trip driver 112 triggers the OS port to drive the output to maintain the minimum set pulse width. When the minimum set pulse width output is completed, when the latch signal of the latch 107 remains valid, the driving output of the OS port will continue to exist until the leakage disappears and the latch signal is reset. When a valid leakage signal is detected again and the latch signal is locked and output again, the OS port of the trip driver 112 will again trigger the driving output to maintain the minimum set pulse width high level, thereby achieving continuous pulse output. When the driving mode selector 108 is set to the single pulse output mode, the trip driver 112 triggers the OS port to drive the output to maintain a fixed pulse width output. After the fixed pulse width output is completed, regardless of whether the latch signal and the leakage signal of the latch 107 still exist or are valid again, the OS port remains at a low level until the system is powered on and reset. That is, in each normal power-on working cycle, in the single pulse output mode, the OS port of the trip driver 112 is only triggered and outputs the preset pulse width once. The output of the trip driver 112 drives the OS port to trigger the thyristor SCR1 and the trip circuit to be turned on, thereby cutting off the power supply to the load and playing a protective role.

[0058] When the output of the latch 107 is valid, it will also enable the DRV port of the sound and photoelectric driver 117 together with the pulse generator 116 to generate a set pulse output signal, and drive the anode of the LED light-emitting diode through the external current-limiting resistor R2. The LED light-emitting diode flashes and sends out an alarm signal. It can also drive other devices such as speakers, buzzers and photoelectric conversion devices, which is a simple replacement of this embodiment.

[0059] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any technical equivalent transformation made using the contents of the present invention specification shall fall within the protection scope of the present invention.

Claims

1. A multifunctional leakage detection and protection circuit device, characterized in that include: Induction coil, ground fault detection circuit, trip unit, rectifier bridge circuit, thyristor, clamping diode, resistor, capacitor, test button; INP and INN of the ground fault detection circuit are respectively connected to capacitor C3, and INP and INN are also connected to one end of resistors R4 and R5; the other end of resistor R4 is respectively connected to the anode of diode D1 and the cathode of D2, and the other end of resistor R5 is respectively connected to the cathode of diode D1 and the anode of D2; diodes D1, D2, resistor R3 are connected in parallel with the secondary of induction coil coil1; The OA port of the ground fault detection circuit is connected to capacitor C0, and the other end of capacitor C0 is grounded to GND; the OS port of the ground fault detection circuit is connected to the trigger port of thyristor SCR1, and the OS port is also connected to capacitor C4, and the other end of capacitor C4 is grounded to GND; the DLY port of the ground fault detection circuit is connected to capacitor C1, and the other end of capacitor C1 is grounded to GND; the anode end of thyristor SCR1 is connected to one end of the solenoid of the trip device, and the cathode end of thyristor SCR1 is grounded to GND; The DRV port of the ground fault detection circuit is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the anode of the LED, and the cathode of the LED is grounded GND; The VDD port of the ground fault detection circuit is connected to one end of the capacitor C2, the VDD port is also connected to one end of the resistor R6, and the other end of the capacitor C2 is connected to the ground port GND; One end of the solenoid of the trip device is connected to the anode of the thyristor SCR1, and the other end of the solenoid is connected to Hot; Load Hot and Load Neutral of the power supply end and the load end are connected to both ends of the trip device switch; The rectifier circuit includes diodes D3, D4, D5, D6 and a resistor R6; wherein the anodes of D3 and D5 are grounded, the cathode of D3 and the anode of D4 are connected to Hot, the cathodes of D4 and D6 are connected to one end of R6, and the cathode of D5 and the anode of D6 are connected to Neutral; The test button includes a current limiting resistor R0 and a test switch RESET, one end of the resistor R0 is connected to the test switch RESET, the other end of the resistor R0 is connected to Neutral, the other end of the test switch RESET is connected to Hot; The induction coil is used to sense and obtain a ground fault leakage current signal; the ground fault detection circuit is used to amplify, filter, rectify, detect, integrate, compare, judge, and latch the ground fault leakage signal obtained by the induction coil, and control the generation of output trip drive and sound and light drive signals; The signal input end of the multifunctional leakage detection and protection circuit device inputs the ground fault leakage current signal, and the signal output end is used to output a control signal to drive the release device to cut off the load power supply and drive the sound and light alarm device to send an alarm signal when a ground fault occurs; The ground fault detection circuit includes: an amplifier, a filter, a rectifier, a detector, an integrator, a comparator, an oscillator, a counter, a control circuit, a pulse generator, a reset circuit, a latch, a drive mode selector, a bandgap reference, a voltage regulator, a trip driver and an acoustic and optical driver; When a leakage fault occurs in the multifunctional leakage detection and protection circuit device, the induction coil senses the residual current and amplifies it through the amplifier. The filter filters out interference and high-frequency clutter signals, and then sends it to the rectifier. The rectifier rectifies the AC leakage signal and flips the negative half-wave cycle signal for subsequent signal detection and processing. The detector receives the output signal of the rectifier and performs signal detection, signal processing and comparison. By comparing it with the reference voltage value, when the signal exceeds the reference voltage value, the detector outputs a high-level signal and sends it to the integrator input port. The integrator receives the detector output signal. When it is high, the integrator is enabled to start charging the capacitor. At the same time, the capacitor charging end is also connected to the input end of the comparator and compared with the reference voltage. When the integrator charges the capacitor to a value higher than the reference voltage, the comparator outputs a high level and triggers the latch to lock the high level output. At the same time, the counter starts counting: 1) When the counter counts to the set value, the comparator output level value is detected at this time. When the comparator output level is still high, the counter continues to count and the latch output remains high; 2) When the counter counts to the set value, the comparator output level value is detected at this time. When the comparator output level is low, the counter stops counting and resets, and the latch output changes from high level to low level output; The output of the latch is connected to the input of the drive mode selector: 1) When the output drive mode is continuous pulse output, the latch controls the trip driver to output a continuous pulse signal, that is, when a valid leakage signal is detected, the drive signal can be continuously / repeatedly output; 2) When the output drive mode is single pulse output, in each power-on reset cycle, when the comparator outputs a high level, the latch controls the trip driver to output a fixed-period single pulse signal, that is, it only outputs a fixed pulse drive signal once.

2. A multifunctional leakage detection and protection circuit device according to claim 1, characterized in that: The integrator is used to start charging the capacitor through the voltage source / current source when the output of the detector is valid; the comparator compares the output integrated voltage value of the integrator with the reference voltage value, and the comparison result serves as the input signal of the latch and the control circuit; the latch locks the output result of the comparator when the comparator outputs a valid high-level signal.

3. The multifunctional leakage detection and protection circuit device according to claim 1, characterized in that: The drive mode selector is used to control the selection of continuous pulse output or single pulse output mode, and control the output of the tripping driver.

4. The multifunctional leakage detection and protection circuit device according to claim 1, characterized in that: The bandgap reference is used to generate a stable bandgap reference source that is independent of temperature and voltage, and provides an ideal constant voltage reference source and current source for the circuit.

5. The multifunctional leakage detection and protection circuit device according to claim 1, characterized in that: The reset circuit is used to generate a power-on reset signal to enable each module circuit to start normal operation.

6. The multifunctional leakage detection and protection circuit device according to claim 1, characterized in that: The pulse generator is used to generate a pulse signal for controlling the output of the acousto-optical drive.

7. The multifunctional leakage detection and protection circuit device according to claim 1, characterized in that: The acousto-optical driver is used to control and drive the acousto-optical device.

8. The multifunctional leakage detection and protection circuit device according to claim 1, characterized in that: The output of the latch is also connected to the pulse generator. When the latch outputs a high level, it enables the pulse generator together with the control circuit to provide a periodic square wave pulse signal to control the acousto-optical driver to output a periodic square wave pulse drive signal.

9. The multifunctional leakage detection and protection circuit device according to claim 1, characterized in that: The voltage regulator is used to stabilize the external power supply voltage VDD. When the external power supply voltage VDD gradually rises from 0V to the minimum operating voltage set by the system, the voltage regulator starts to work normally, provides a stable voltage to each circuit of the system, and outputs a signal to the reset circuit to generate a power-on reset enable signal to enable each internal circuit to start working; When the external power supply voltage VDD continues to rise and exceeds the set voltage value, the internal OVP overvoltage protection circuit of the voltage regulator starts to work, so that the VDD voltage is maintained at the set voltage value of about 5V. The voltage regulator also provides stable DC power supply to the internal circuit module; When the external power supply voltage VDD drops from a normal voltage value higher than the minimum operating voltage to a value lower than the minimum operating voltage, the voltage regulator circuit triggers the power-on reset enable signal to be invalid, and the internal circuits stop working to avoid erroneous output due to too low voltage.

10. The multifunctional leakage detection and protection circuit device according to claim 1, characterized in that: The oscillator circuit is used to generate and provide the system's internal clock CLK reference signal; the oscillator output is also provided to the counter as a counting reference clock input signal; the oscillator output is also provided to the pulse generator as the initial pulse generation clock signal of the pulse generator, so as to generate a valid pulse square wave signal to drive the sound, light and electricity equipment to send an alarm signal.

11. The multifunctional leakage detection and protection circuit device according to claim 1, characterized in that: The control circuit is used for control, data calculation, data analysis, data judgment, coordination, and enabling the coordinated work of various circuit function modules, monitoring and processing the system input and output ports and various internal signal logic states and results, and issuing operation instructions.

12. The multifunctional leakage detection and protection circuit device according to claim 1, characterized in that: The tripping driver is used to drive the tripping actuator to drive the thyristor gate to trigger the thyristor to turn on, thereby causing current to flow in the tripping circuit and triggering the start-up to cut off the load power supply, thereby eliminating the existing dangerous fault.

13. The multifunctional leakage detection and protection circuit device according to claim 1, characterized in that: The pulse generator is used to process the initial clock signal provided by the oscillator through the control circuit to generate a square wave pulse signal with a predetermined period and duty cycle, and use it as the input signal of the acoustic and optical driver.

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