Leakage overcurrent high temperature protection circuit

Abstract

The invention discloses an electric leakage overcurrent high-temperature protection circuit. The electric leakage overcurrent high-temperature protection circuit comprises a power supply input end, a power supply output end, a circuit disconnection device and a main control chip, wherein the power supply input end is provided with an electric leakage detection circuit, the power supply output end is provided with a load overcurrent detection circuit, and the electric leakage detection circuit and the load overcurrent detection circuit are switched into the main control chip; the main control chip is further connected with a temperature detection element; a control part in the circuit disconnection device is switched into the main control chip, and the main control chip is used for triggering the disconnection or connection of the circuit disconnection device through monitoring for the electric leakage detection circuit, the load overcurrent detection circuit and the temperature detection element. In the electric leakage overcurrent high-temperature protection circuit, the electric leakage detection circuit, the load overcurrent detection circuit and the high-temperature protection circuit are detected through the main control chip respectively, and whether the circuit is disconnected by the circuit disconnection device is controlled according to a preset numerical value. The circuit disclosed by the invention is simple in design, and has various detection functions, so that potential safety hazards for electricity application can be effectively prevented.

Description

Technical field: [0001] The invention relates to the technical field of protection circuits, in particular to a leakage and overcurrent high-temperature protection circuit, which can be used in daily electrical appliances, sockets and other products to better ensure electricity safety. Background technique: [0002] In order to ensure the safety of electricity use, various protection circuits are usually added to the circuit. There are two common protection circuits: [0003] The first type is: leakage detection and protection circuit, which usually has two types of leakage protection relay and leakage protection switch. It is mainly to detect the leakage in the circuit, so as to cut off the circuit. [0004] The second type is: overcurrent detection and protection circuit, which is a circuit for protection against the current at the load end in the loop exceeding a predetermined current. When the load end of the circuit has an overcurrent (such as a short circuit), in or...

AI Technical Summary

Problems solved by technology

Although many similar products have already been set up, their functions are single and the circuit design is complicated, which cannot fully guarantee the safety of electricity use.

At the same time, the response time of the current overcurrent protection device used in the circuit is relatively slow. For example, the current air switch device usually takes about 300 seconds to respond, and it is greatly affected by environmental factors. When it responds after the disaster may have occurred

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