Detection circuit and method for power failure time delay circuit, power failure time delay device, and electric appliance

Abstract

The invention provides a detection circuit and method for a power-down delay circuit, a power-down delay device and an electrical appliance. The detection circuit of the power-down delay circuit includes a charge and discharge control module and a processing module; the charge and discharge control module is used to control the conduction and disconnection between the power supply and the power-down delay circuit, so as to The delay capacitor is charged and discharged; the processing module is used to control the conduction and disconnection between the power supply and the power-down delay circuit through the charge and discharge control module when the power supply is not powered off , and judge whether there is a fault in the power-down delay circuit according to the time from when the voltage of the detection port drops to the set voltage from when it is disconnected. By detecting the power-off delay time of the power-down delay circuit, the present invention can conveniently judge whether there is an abnormality in the power-down delay circuit, thereby facilitating timely sending out fault reminders to the abnormal power-down delay circuit.

Description

technical field [0001] The invention relates to the technical field of electrical equipment, in particular to a detection circuit and method for a power-down delay circuit, a power-down delay device, and an electrical appliance. Background technique [0002] In the control system of some electrical appliances, in order to protect some important components in the electrical appliances, a power-down delay circuit is often used. For example, in a control system that uses a compressor as the driving object, in order to protect the reliability of the compressor, a power-down delay circuit is usually used to time the stop time of the compressor during operation, and to detect the length of the power-down time to prevent Immediately turning on the compressor may adversely affect the compressor. In this type of system, the condition of the power-down delay circuit itself will directly affect the safety and stability of important components such as the compressor. If the power-down ...

AI Technical Summary

Problems solved by technology

In this type of system, the condition of the power-down delay circuit itself will directly affect the safety and stability of important components such as the compressor. If the power-down delay circuit fails and is not discovered, it may cause undesired damage

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