Power system with adaptive minimum frequency
AssigneeMonolithic Power Systems, Inc.
InventorsJiangheng Lu, Siran Wang
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Abstract
A power system with adaptive minimum frequency is disclosed. The power system includes a resonant converter and a control circuit. Under the control of the control circuit, the resonant converter works with an adaptive minimum frequency. The value of the adaptive minimum frequency is preset and is selected by an equivalent resistance or an output voltage of the resonant converter.
Claims20
A power system, comprising:
- a resonant converter, configured to convert an input voltage to an output voltage to power a load;
- and
- a control circuit, configured to provide a drive control signal for controlling the resonant converter working with a frequency having a minimum value varied based on the output voltage.
A control circuit of a resonant converter, wherein the resonant converter provides an output voltage and an output current to power a load, comprising:
- a minimum frequency circuit, configured to provide a minimum frequency signal based on the output voltage of the resonant converter;
- and
- a control unit, configured to provide a drive control signal for controlling the resonant converter working with a frequency having a minimum value determined by the minimum frequency signal.
A control method for controlling a resonant converter, wherein the resonant converter works with a frequency and provides an output voltage and an output current to a load, the control method comprising:
- presetting at least two minimum values for a lower limit of the frequency of the resonant converter;
- and
- selecting one of the at least two minimum values as the lower limit of the frequency of the resonant converter based on the output voltage of the resonant converter.
Dependencies are inferred from the claim text.