Resonant power converting circuit
AssigneesLite-On Electronics (Guangzhou) Limited, Lite-On Technology Corporation
InventorsYeh Guan, Chih-Tai Chen
Life of this patent
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Abstract
A resonant power converting circuit is provided, which includes a resonant converting unit, a control unit, a current detecting unit and a frequency modulation unit. The control unit outputs switching signals to the resonant converting unit to adjust an output thereof. The current detecting unit is configured to detect an output current of the resonant converting unit. The frequency modulation unit may adjust a lowest switching frequency of the control unit according to the detected output current so as to increase a gain of the resonant converting unit and an output stability of the resonant converting unit.
Claims10
A resonant power converting circuit, comprising:
- a resonant converting unit;
- a control unit, coupled to the resonant converting unit, the control unit outputting at least one first switching signal to the resonant converting unit so as to adjust an output voltage of the resonant converting unit, wherein the control unit is associated with a lowest switching frequency for limiting a frequency of the first switching signal;
- a current detecting unit, coupled to an output of the resonant converting unit, the current detecting unit detecting an output current of the resonant converting unit;
- and
- a frequency modulation unit, coupled to the current detecting circuit and the control unit, the frequency modulation unit adjusting the lowest switching frequency of the control unit in response to the output current and comprising
- a first resistor coupled between a frequency setup terminal of the control unit and a ground terminal;
- and
- a first modulation unit coupled to the current detecting unit and the frequency setup terminal of the control unit;
- wherein the lowest switching frequency of the control unit is increased by the frequency modulation unit when the output current exceeds a predetermined current value.
A resonant power converting circuit, comprising:
- a resonant converting unit;
- a control unit, coupled to the resonant converting unit , the control unit outputting at least one first switching signal to the resonant converting unit so as to adjust an output voltage of the resonant converting unit, wherein the control unit is associated with a lowest switching frequency for limiting a frequency of the first switching signal;
- a current detecting unit, coupled to an output of the resonant converting unit, the current detecting unit detecting an output current of the resonant converting unit;
- and
- a frequency modulation unit, coupled to the current detecting circuit and the control unit, the frequency modulation unit adjusting the lowest switching frequency of the control unit in response to the output current and comprising
- a first resistor having a first terminal coupled to a frequency setup terminal of the control unit;
- a grounded capacitor coupled between a second terminal of the first resistor and a ground terminal;
- and
- a first modulation unit coupled to the current detecting unit and the frequency setup terminal of the control unit;
- wherein the lowest switching frequency of the control unit is increased by the frequency modulation unit when the output current exceeds a predetermined current value.
Dependencies are inferred from the claim text.