Failure detecting and protecting method of controlled silicon and device thereof

Abstract

The invention discloses a failure detecting and protecting method of a controlled silicon, comprising the following steps of: detecting whether a power source zero-crossing signal jumps by a central processing unit; carrying out opened circuit mark on the controlled silicon when the voltage of the controlled silicon is always less than 0.5V or always more than 4.8V after the zero-crossing signal jumps; carrying out short circuit mark on the controlled silicon when the voltage of the controlled silicon is always between 2.5V and 4.0V after the zero-crossing signal jumps; and operating a controlled silicon protection program by the central processing unit. The invention also discloses a failure detecting and protecting device of the controlled silicon. Through the failure detecting and protecting method of the controlled silicon and the device thereof provided in the invention, whether a fault occurrence element is the controlled silicon can be correctly judged, and the device is convenient to maintain through displaying fault information and a way of automatically cutting off a load power supply relay, therefore the security performance and the intellectualization degree of the product are improved.

Description

【Technical field】 [0001] The invention relates to household appliances, in particular to a failure detection and safety protection method and device for a thyristor of a control device of the household appliance. 【Background technique】 [0002] As the most commonly used electronic control device for electrical appliances, thyristor is widely used in control occasions such as motor speed regulation and heating wire temperature regulation. Together with CPU, it constitutes the core component of home appliance control. As a key executive component, the silicon controlled rectifier, once opened and short-circuited, will cause the temperature of the electric heating equipment to run out of control and the motor to stall, which directly poses a danger to the safe use of the equipment. Starting or revving "flying", causing accidental injury to the user. Most of the existing electrical control technologies use temperature-sensing devices or motor speed-measuring mechanisms (such as...

AI Technical Summary

Problems solved by technology

As a key executive component, the silicon controlled rectifier, once opened and short-circuited, will cause the temperature of the electric heating equipment to run out of control and the motor to stall, which directly poses a danger to the safe use of the equipment. Start or speed "speeding", causing accidental injury to the user

Most of the existing electrical control technologies use temperature-sensing devices or motor speed-measuring mechanisms (such as: Hall elements, photoelectric switches) to detect whether the load is abnormal. Although it can play the role of the last safety insurance protection, its intelligence is relatively low. , the user cannot know which part has the problem, and cannot prompt the exact location of the fault, so maintenance is more troublesome

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