Delta Electronics, Inc.

Wei-Hsin Wen

Yungtaek Jang

Milan M Jovanovic

Yu-Hung Huang

Chi-Hsing Huang

Yi-Hsin Leu

Ching-Horng Wu

Ming-Tsung Hsieh

Chia-Tung Peng

Disclosed is a power supply unit provided with AC/DC voltage detection and a power supply system incorporating such power supply unit. The power control unit of the power supply unit can manipulate the first stage power circuit and the bypass switch thereof according to the form and magnitude of the first voltage which is inputted to the power supply unit in order to boost the overall operating efficiency. When the inventive power supply unit is applied to a high-level DC power supply system, the problem that the power supply unit can not output a rated output voltage due to an insufficient DC first voltage can be avoided.

Power supply unit provided with AC/DC input voltage detection and power supply system incorporating same

A power supply comprises an input voltage detector that detects a drop in input voltage that corresponds to an input voltage loss. A power converter is coupled to the input voltage detector. The power converter, which may be a boost converter or a power factor correction converter, has a switching device that is actuated in accordance with a duty cycle. A duty cycle adjuster is responsive to detection of the drop in the input voltage to adjust the duty cycle of the switching device in order to limit an input current surge through the switching device below a desired level after the input voltage returns.

System and method for limiting input-current surge in a switching mode power supply

Growing community of inventors

Taoyuan Hsien, Taiwan

Wei-Hsin Wen