AC/DC power supply, rectifier circuit and control method
AssigneeSilergy Semiconductor Technology (Hangzhou) LTD
InventorsNan Luo, Qiukai Huang, Jian Deng, Zhaofeng Wang, Jialiang Zhang
Life of this patent
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Abstract
A rectifier circuit applied in an AC/AC power supply, the rectifier circuit including: a filter circuit configured to receive a DC pulsating voltage, and to generate a supply voltage, where the supply voltage follows the DC pulsating voltage during a first time interval of an operation cycle; and where during a second time interval of the operation cycle, a value of the supply voltage is greater than the value of the supply voltage at an end of the first time interval, in order to reduce a size of the filter circuit.
Claims17
A rectifier circuit applied in an AC/AC AC/DC power supply, the rectifier circuit comprising:
- a) a filter circuit configured to receive a DC pulsating voltage, and to generate a supply voltage, wherein the supply voltage follows the DC pulsating voltage during a first time interval of an operation cycle;
- b) wherein during a second time interval of the operation cycle, a second value of the supply voltage is greater than a first value of the supply voltage at an end of the first time interval, in order to reduce a size of the filter circuit;
- and
- c) wherein the filter circuit comprises a first capacitor coupled in parallel with an input terminal of the filter circuit, and a second capacitor selectively coupled in parallel with the input terminal of the filter circuit, wherein a capacitance value of the second capacitor is greater than a capacitance value of the first capacitor, and the second capacitor is disconnected from the parallel connection with the first capacitor in a first part of the first time interval.
A method of controlling a rectifier circuit, the method comprising:
- a) generating a supply voltage according to a DC pulsating voltage rectified by a filter circuit in the rectifier circuit;
- b) during a first time interval of an operation cycle, controlling the supply voltage to follow the DC pulsating voltage;
- c) during a second time interval, controlling a second value of the supply voltage to be greater than a first value of the supply voltage at an end of the first time interval, thereby reducing a size of the filter circuit;
- d) wherein in a first part of the first time interval, the filter circuit generates a first capacitance value to receive the DC pulsating voltage;
- and
- e) wherein in a second time interval and a second part of the first time interval, the filter circuit generates a second capacitance value to receive the DC pulsating voltage, and the second capacitance value is greater than the first capacitance value.
Dependencies are inferred from the claim text.