Intelligent leakage protection plug with leakage protection function failure re-protection function

Abstract

The invention relates to an intelligent leakage protection plug with a leakage protection function failure re-protection function. The plug comprises a direct current power supply circuit, a test circuit, a leakage fault induction coil, and a leakage fault monitoring circuit. The direct current power supply circuit provides the leakage fault monitoring circuit and the following circuits with a direct current working power supply. The output end of the leakage induction coil is electrically connected with the input end of the leakage fault monitoring circuit. The plug further comprises a relayswitch circuit, a microcontroller control circuit and a leakage protection function monitoring circuit. The microcontroller control circuit includes a control chip and a storage chip. The control chipis provided with a reset switch. The relay switch circuit includes a relay with three sets of normally open contacts and a drive switch circuit. The three sets of normally open contacts of the relayare connected in series with the three-pole power supply of L fire, N zero and PE ground respectively. The plug can monitor the fault of the leakage protection circuit. When the leakage protection function fails, the plug can automatically cut off the power supply and give an alarm. The plug has the functions of power-down memory and power-off protection, can meet the national standard requirementfor work at low-voltage AC50V, and is safe and reliable.

Description

technical field [0001] The invention relates to an intelligent leakage protection plug with the function of re-protection after the failure of the leakage protection function. Background technique [0002] Commonly used leakage protection plugs (PRCD) generally do not have a power-off protection function. When a leakage fault occurs and a single-phase power failure occurs, such as using a switch socket, the leakage protection control circuit cannot trip and cut off the L fire due to loss of power. N zero and PE three-pole power supply, so there are still some potential safety hazards; there is an intelligent leakage protection plug that can trip and cut off the three-pole power supply when there is a leakage fault and a single-phase power failure, but it is low at AC50V It cannot work under high voltage, so it cannot meet the requirements of the national standard, and there are still many defects such as low intelligence, too much static power consumption, complex circuits, ...

AI Technical Summary

Problems solved by technology

[0002] Commonly used leakage protection plugs (PRCD) generally do not have a power-off protection function. When a leakage fault occurs and a single-phase power failure occurs, such as using a switch socket, the leakage protection control circuit cannot trip and cut off the L fire due to loss of power. N zero and PE three-pole power supply, so there are still some potential safety hazards; there is an intelligent leakage protection plug that can trip and cut off the three-pole power supply when there is a leakage fault and a single-phase power failure, but it is low at AC50V It cannot work under high voltage, so it cannot meet the requirements of the national standard, and there are still many defects such as low intelligence, too much static power consumption, complex circuits, etc. In addition, there are no preventive measures for the failure of the leakage protection function. When the protection function of the circuit fails due to failure of components and other components, it will not be able to trip and cut off the power, so there are still certain potential safety hazards

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