X capacitor discharge control circuit and method and switching power supply
A capacitor discharge circuit and capacitor discharge technology, applied in the direction of control/regulation systems, electrical components, and adjustment of electrical variables, can solve problems such as wasting electric energy, reducing circuit efficiency, and generating power consumption
Inactive Publication Date: 2021-01-29
HUAYUAN SEMICON SHENZHEN LTD
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Problems solved by technology
However, the discharge resistor will also generate power consumption when the circuit is working normally, thereby reducing the efficiency of the entire circuit and wasting more power
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[0060] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0061] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects and not necessarily Describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or...
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According to the X capacitor discharge control circuit, the X capacitor discharge control method and the switching power supply provided by the invention, the discharge of the X capacitor can meet thenational standard, and the power consumption generated when the circuit works normally can be reduced. The discharge control circuit comprises a voltage detection circuit, a logic control circuit, avoltage self-sustaining circuit and an X capacitor discharge circuit. The voltage detection circuit is used for detecting the output voltage of the rectification circuit and feeding back a detection signal representing the output voltage to the logic control circuit. The logic control circuit is used for obtaining a detection signal and outputting a first control signal to the X capacitor discharge circuit when determining that the input power supply is removed based on the detection signal; the voltage self-sustaining circuit can be used for maintaining the voltage above undervoltage protection after the primary control chip is self-started and an alternating current input power supply removal event occurs, so as to maintain the normal work of the primary control chip; and the X capacitordischarge circuit responds to a first control signal and discharges an X capacitor through the rectification circuit.
Description
technical field [0001] The invention relates to the field of circuit technology, in particular to an X capacitor discharge control circuit, method and switching power supply. Background technique [0002] The full name of the X capacitor is to suppress the electromagnetic interference of the power supply. It is suitable for electronic circuits, household appliances, motors and other scenarios. It is generally installed before the primary rectifier module of the circuit. It is especially widely used in common electronic equipment such as mobile phone chargers and ATX power supplies. [0003] In actual circuits, the X capacitor specification is generally not lower than the uF level, and a large amount of charge is stored in the X capacitor. After the equipment using the X capacitor is disconnected from the grid power supply, the X capacitor is connected to the phase line so that the power plug of the equipment has a high voltage. If the human body accidentally touches the pow...
Claims
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IPC IPC(8): H02M3/28H02M3/335H02M1/32H02M1/44
CPCH02M1/32H02M1/44H02M3/28H02M3/33592H02M1/322
Inventor 李盛峰郭春明张程龙腾谋艳
Owner HUAYUAN SEMICON SHENZHEN LTD