Delta Electronics, Inc.

Xinwei Liu

Xingkuan Guo

Kailiang Zhan

Xiaobing Rong

A control method for a power supply apparatus is provided. Firstly, at least one of an output voltage or an output current of the resonant converter is sampled. Then, an error signal is generated according to a reference value and at least one of the output voltage or the output current. While the resonant converter is in a burst mode, a first switching signal and a chopping signal are generated according to the error signal. The chopping signal has a chopping period and a duty cycle. The chopping period and the duty cycle are dynamically adjusted according to the error signal. Then, a second switching signal is generated according to the chopping signal and the first switching signal. A switch unit of the resonant converter is turned on or turned off according to the second switching signal.

Power supply apparatus and control method thereof

Embodiments of the present disclosure provide an LLC resonant converter system. The LLC resonant converter system includes: a first resonant circuit including a first switch circuit, a first LC resonant circuit, a first transformer, and a first rectifier circuit; and a second resonant circuit including a second switch circuit, a second LC resonant circuit, a second transformer, and a second rectifier circuit; where one secondary side winding of the first transformer is connected in series with one secondary side winding of the second transformer to form a first series branch, and the other secondary side winding of the first transformer is connected in series with the other secondary side winding of the second transformer to form a second series branch. The LLC resonant converter system achieves current equilibrium or voltage equilibrium in a two-branch resonant circuit, thereby simplifying a control circuit and improving current equilibrium or voltage equilibrium effects.

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Taoyuan, Taiwan

Xinwei Liu