Resonant converter and burst mode starting method thereof
AssigneeDelta Electronics, Inc.
InventorsDe-Zhi Jiao, Tao Wu, Dong Lin
Life of this patent
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Abstract
A resonant converter and burst mode starting method thereof are provided. The resonant converter includes a converting stage, a transformer to induce the output of converting stage from the primary side to the secondary side, a rectifying stage to rectify the output of the transformer, a filtering and load stage to filter the output of the rectifying stage, and a charge pump circuit coupled to the transformer or the rectifying stage. The charge pump circuit is for raising a voltage level of the filtering and load stage to higher than a predetermined value so that a feedback voltage of the resonant converter varies. The burst mode of the resonant converter is than started in accordance with the variance.
Claims14
A resonant converter, comprising:
- a converting stage;
- a transformer coupled to the converting stage for inducing an output of the converting stage from a primary side to a secondary side thereof;
- a rectifying stage coupled to the secondary side of the transformer for rectifying an output of the transformer;
- a filtering and load stage coupled to the rectifying stage for filtering an output of the rectifying stage;
- and
- a charge pump circuit coupled to the rectifying stage for charging the filtering and load stage to cause a voltage level of the filtering and load stage being higher than a predetermined value, so that a burst mode of the resonant converter is started.
A resonant converter, comprising:
- a converting stage;
- a transformer coupled to the converting stage for inducing an output of the converting stage from a primary side to a secondary side thereof;
- a rectifying stage coupled to the secondary side of the transformer for rectifying an output of the transformer;
- a filtering and load stage coupled to the rectifying stage for filtering an output of the rectifying stage;
- and
- a charge pump circuit coupled to the transformer for charging the filtering and load stage to cause a voltage level of the filtering and load stage being higher than a predetermined value, so that a burst mode of the resonant converter is started.
A burst mode starting method for a resonant converter, wherein the resonant converter comprises a converting stage, a transformer, a rectifying stage, and a filtering and load stage, and the method comprises the follow steps:
- raising a voltage level of the filtering and load stage higher than a predetermined voltage value so as to vary a feedback voltage of the resonant converter;
- starting the burst mode of the resonant converter in response to the variance of the feedback voltage;
- and
- causing a voltage level of the filtering and load stage to be higher than a predetermined value using a charge pump circuit coupled to the transformer, so that a burst mode of the resonant converter is started.
Dependencies are inferred from the claim text.