Overtemperature and overcurrent protection module with manual reset in charged state

Abstract

The invention provides an overtemperature and overcurrent protection module with manual reset in a charged state. The overtemperature and overcurrent protection module is provided with a temperature sensor, a current transformer, a relay, a reset button, a microprocessor, a power supply interface and a load interface. The current transformer is connected with the load interface and is connected with the microprocessor through a sampling circuit. The relay is connected between the power supply interface and the load interface and is connected with the microprocessor. The temperature sensor is connected with the microprocessor through a signal input circuit. The reset button is connected with the microprocessor. When the load current or temperature reaches a set value, the microprocessor controls the relay to cut off a load circuit, the overcurrent and overtemperature protection of the load is realized, after the load circuit is disconnected, the reset button can be pressed to restore and turn on the load circuit in a state that the protection module is charged. According to the overtemperature and overcurrent protection module, the accurate measurement of the temperature and current of the load and the double protection of overtemperature and overcurrent can be realized, and the manual reset of the load of a cut-off circuit in a charged state can be carried out.

Description

【Technical Field】 [0001] The invention relates to an over-temperature and over-heat protection device for an electric heating load, in particular to an over-temperature and over-current protection module that can be set to different temperatures and currents, and can be manually reset in a live state. 【Background technique】 [0002] Various electrical equipment are used in industrial production and people's lives. The performance of electrical equipment is not only reflected in its use function, but more importantly, its use safety. When the electric load fails, it will cause the load to overheat and overheat. When the temperature exceeds the normal value, it will cause the load to be short-circuited and burned, which will affect the normal use of the load. For this reason, general loads are equipped with temperature switches or thermostats to disconnect the power supply when the load temperature exceeds the set value to protect the safety of the equipment. However, the existi...

AI Technical Summary

Problems solved by technology

However, the existing electronic or electrical equipment can usually only perform single-point temperature measurement and control, that is, it can only be controlled according to a certain set temperature value, and cannot continuously adjust and control the temperature according to actual needs. control, resulting in a limited range of application

In addition, after the load circuit is disconnected, some temperature control devices will automatically resume conduction when the load temperature returns to normal, regardless of whether the fault that caused the power outage is eliminated, so there is a potential for further faults

For other temperature control devices, the power supply must be manually disconnected to restore conduction to the load, which is cumbersome.

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