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US 8,711,580 B2Granted
Resonant conversion system with over-current protection processes
AssigneeDelta Electronics, Inc.
InventorsJinfa Zhang, Lei Cai, Jiaojun Sun, Guodong Yin
Life of this patent
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Abstract
A resonant conversion system is provided, in which a resonant converter receives an input voltage to generate an output voltage, and a buck converter provides the input voltage of the resonant converter, and controls the input voltage to perform an over-current protection process.
Claims18
A resonant conversion system, comprising
- a resonant converter, receiving an input voltage to generate an output voltage;
- a buck converter, providing the input voltage and controlling the input voltage for performing an over-current protection process;
- and
- a first controller, decreasing a duty cycle of a switching device of the buck converter to decrease the input voltage received by the resonant converter, when the resonant converter generates the over-current,
- wherein, when an output current exceeds a first predetermined current, the first controller determines that the resonant converter generates the over-current, and restricts the output current of the resonant converter in the first predetermined current or in a second predetermined current higher than the first predetermined current.
2 more elements
A resonant conversion system, comprising:
- a resonant converter;
- a buck converter, providing a DC voltage to serve as an input voltage of the resonant converter such that the resonant converter generates an output voltage;
- and
- a first controller, controlling the buck converter to decrease the input voltage received by the resonant converter for performing an over-current protection process, when determining that the resonant converter has generated an over-current,
- wherein, when an output current exceeds a first predetermined current, the first controller determines that the resonant converter generates the over-current, and restricts the output current of the resonant converter in the first predetermined current or in a second predetermined current higher than the first predetermined current.
2 more elements
An over-current protection method, comprising
- detecting a signal corresponding to an output current of a resonant converter to generate a first detection result;
- determining whether the resonant converter generates an over-current according to the first detection result;
- and
- controlling a buck converter to decrease an input voltage of the resonant converter for performing an over-current protection process, when the resonant converter generates the over-current,
- wherein, when the output current of the resonant converter exceeds a first predetermined current, it is determined that the resonant converter generates the over-current, and the output current of the resonant converter is restricted in the first predetermined current or a second predetermined current higher than the first predetermined current.
2 more elements
An over-current protection method, comprising
- progressively increasing a duty cycle of a buck converter from a minimum duty cycle when a resonant conversion system is powered on, such that an input voltage of a resonant converter is progressively increased;
- detecting a signal corresponding to an output current of the resonant converter to generate a first detection result;
- determining whether the resonant converter generates over-current according to the first detection result;
- and
- controlling the buck converter to decrease the input voltage of the resonant converter for performing an over-current protection process, when the resonant converter generates the over-current,
- wherein the over-current protection process comprises restricting the output current of the resonant converter in a first predetermined current or in a second predetermined current higher than the first predetermined current.
3 more elements
Dependencies are inferred from the claim text.