Power supply device with low loss
AssigneeAcer Incorporated
InventorTzu-Tseng Chan
Life of this patent
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Abstract
A power supply device with low loss includes a bridge rectifier, a boost inductor, a power switch element, a first output stage circuit, a switch circuit, a transformer, a resonant capacitor, a second output stage circuit, and a detection and control circuit. The power switch element selectively couples the boost inductor to a control node according to a first driving voltage. The resonant capacitor provides a capacitive voltage. The second output stage circuit includes a sense resistor. An output current flows through the sense resistor, such that a sense voltage difference is formed across the sense resistor. The detection and control circuit generates the first driving voltage, and determines a tunable voltage at the control node according to the capacitive voltage and the sense voltage difference.
Claims15
A power supply device with low loss, comprising:
- a bridge rectifier, generating a rectified voltage according to a first input voltage and a second input voltage;
- a boost inductor, receiving the rectified voltage;
- a power switch element, selectively coupling the boost inductor to a control node according to a first driving voltage;
- a first output stage circuit, coupled to the boost inductor, and generating a median voltage;
- a switch circuit, generating a switching voltage according to the median voltage, a second driving voltage, and a third driving voltage;
- a transformer, comprising a main coil, a first secondary coil, and a second secondary coil, wherein a leakage inductor and a magnetizing inductor are built in the transformer, and the main coil receives the switching voltage through the leakage inductor;
- a resonant capacitor, coupled to the magnetizing inductor, and providing a capacitive voltage;
- a second output stage circuit, coupled to the first secondary coil and the second secondary coil, and generating an output voltage and an output current, wherein the second output stage circuit comprises a sense resistor, and the output current flows through the sense resistor, such that a sense voltage difference is formed across the sense resistor;
- and
- a detection and control circuit, generating the first driving voltage, the second driving voltage, and the third driving voltage;
- wherein the detection and control circuit determines a tunable voltage at the control node according to the capacitive voltage and the sense voltage difference.
Dependencies are inferred from the claim text.