A method and circuit for controlling X-capacitor discharge

Abstract

The invention discloses an X capacitor bleeding control method. The method includes the following steps that: pulse signals outputted by a zero crossing detection circuit are received in real time; whether the pulse signals are zero or not is judged; and first control signals for controlling the switching on of an AC load are generated and transmitted when it is judged that a time period during which the pulse signals are not zero exceeds a first preset time, wherein the AC load responds to the first control signals and is switched on so as to bleed stored energy of an X capacitor. According to the X capacitor bleeding control method provided by the invention, the AC load begins working only when it is judged that the pulse signals are not zero and the time period during which the pulse signals are not zero exceeds the first preset time, namely, after a power source is switched off, and therefore, the AC load will not consume the energy of a circuit in a time period when the AC load is not required to work, and thus, the problem of standby power consumption in prior art can be solved.

Description

Technical field [0001] The invention relates to the technical field of household appliances circuits, in particular to an X capacitor discharge control method and circuit. Background technique [0002] Generally, household appliances connect an X capacitor across the fire-zero line of their power circuit to eliminate differential mode interference in the circuit to meet the product’s electronic compatibility requirements; but because the capacitor is an energy storage element, when the power is cut off If there is no circuit for discharging the energy of the X capacitor, the energy stored in the X capacitor will not be released. At this time, if the human body touches the plug, it may be electric shocked. [0003] Therefore, many safety standards require the appliance to be powered by the rated voltage. When the appliance is disconnected from the power supply at the peak of the voltage for 1 second, the plug measured with an instrument that will not significantly affect the measure...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides an X capacitor discharge control method and circuit to solve the problem of standby power consumption in the prior art

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