Omron Corporation

Mitsuru Sato

Shingo Nagaoka

Takeshi Uematsu

Hiroyuki Onishi

At a first node, an intermediate voltage potential occurs between a voltage potential of the first input terminal and a voltage potential of the second input terminal A second node is connected to ends of primary windings of transformers of LLC resonant converters. A switch circuit is connected between the first node and the second node. A control circuit is configured to turn on a switch circuit when a load current of a load apparatus connected to a first output terminal and a second output terminal is equal to or smaller than a predetermined criterion and turn off the switch circuit when the load current of the load apparatus is larger than the predetermined criterion.

Power conversion apparatus having multiple LLC converters and capable of achieving desired output voltage even in changes in load current

The LLC resonant converter includes a bridge circuit configured to receive a DC input voltage, an LLC resonant circuit connected to the bridge circuit, a transformer connected to the LLC resonant circuit, a rectifier circuit connected to the transformer and configured to send out a converted DC voltage, a resonant capacitor changeover circuit, a bridge circuit control section, and a resonant capacitor changeover control section. When the input voltage exceeds a changeover voltage, the operating frequency is raised higher than the resonance frequency, and thereafter the switch is turned off.

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Kyoto, Japan

Mitsuru Sato