An intelligent detection and protection circuit for termination of service life of ground fault breaker

Abstract

The related intelligent detection protective circuit for lifetime termination of grounding fault breaker adds an abnormal monitor circuit for the leakage protector fault based on general leakage protector. This invention employs LED to display abnormal condition, and reduces accident for people protection.

Description

Technical field

[0001] The invention relates to an intelligent detection and protection circuit for the end of life of a ground fault circuit breaker. Background technique

[0002] The basic principle of the ground short-circuit leakage protection device of the low-voltage electrical appliance ground fault circuit interrupter GFCI is: on an AC active line, the loop current of the live line and the neutral line should be equal under the condition of normal power consumption. Once a ground short-circuit leakage accident occurs, the live wire current and the neutral wire current in the loop will be unbalanced. The induction coil in the GFCI leakage protection monitors the current difference and converts it into a voltage signal, which is amplified by the leakage detection circuit IC Then make a judgment and output it to the control part. Once the difference is greater than the set threshold, the control IC will output a corresponding control signal to make the GFCI circuit brea...

Examples

Embodiment Construction

[0014] As shown in the figure, the present invention includes an electric leakage detection circuit and a tripping mechanism, and consists of an associated regulated power supply circuit (201), an alternating current synchronous signal sampling circuit (202), an analog protection actuator (203), and an execution result detection circuit ( 204), executive switch open circuit (205), leakage signal analog circuit (206), single-chip microcomputer MCU, and the monitoring alarm circuit (208) of monitoring leakage detection result form the intelligent detection and protection circuit (200) to leakage detection circuit and trip action part ), wherein the AC synchronous signal sampling circuit (202) is composed of resistors R202, R203, and diode D202 connected together, and the AC power grid synchronous monitoring unit composed of single-chip MCU signals lifts the synchronous half-wave signal from the grid to the single-chip microcomputer as a real-time detection The sampling signal of ...

Technical field

[0001] The invention relates to an intelligent detection and protection circuit for the end of life of a ground fault circuit breaker. Background technique

[0002] The basic principle of the ground short-circuit leakage protection device of the low-voltage electrical appliance ground fault circuit interrupter GFCI is: on an AC active line, the loop current of the live line and the neutral line should be equal under the condition of normal power consumption. Once a ground short-circuit leakage accident occurs, the live wire current and the neutral wire current in the loop will be unbalanced. The induction coil in the GFCI leakage protection monitors the current difference and converts it into a voltage signal, which is amplified by the leakage detection circuit IC Then make a judgment and output it to the control part. Once the difference is greater than the set threshold, the control IC will output a corresponding control signal to make the GFCI circuit brea...

Examples

Embodiment Construction

[0014] As shown in the figure, the present invention includes an electric leakage detection circuit and a tripping mechanism, and consists of an associated regulated power supply circuit (201), an alternating current synchronous signal sampling circuit (202), an analog protection actuator (203), and an execution result detection circuit ( 204), executive switch open circuit (205), leakage signal analog circuit (206), single-chip microcomputer MCU, and the monitoring alarm circuit (208) of monitoring leakage detection result form the intelligent detection and protection circuit (200) to leakage detection circuit and trip action part ), wherein the AC synchronous signal sampling circuit (202) is composed of resistors R202, R203, and diode D202 connected together, and the AC power grid synchronous monitoring unit composed of single-chip MCU signals lifts the synchronous half-wave signal from the grid to the single-chip microcomputer as a real-time detection The sampling signal of ...

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