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US 2014/0210393 A1Published application
Capacitor precharge circuit, motor drive system, electric power steering system and airbag system
AssigneeHitachi Automotive System, Ltd.
InventorsNobuyasu Kanekawa, Ryoichi Kobayashi, Tomonobu Koseki, Chihiro Sato, Tomishige Yatsugi, Hirofumi Kurimoto
Life of this patent
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Abstract
A loss (generation of heat) is reduced in a capacitor precharge circuit, thereby reducing the size of the circuit. The capacitor precharge circuit according to the present invention divides a power supply voltage using a switched capacitor voltage divider circuit, thereby carrying out charging while suppressing a both-terminal voltage of the capacitor that is subject to the charging (refer to FIG. 1).
Claims13
A capacitor precharge circuit charging a capacitor which is connected in parallel with a load comprising:
- a voltage divider capacitor that is connected to the capacitor;
- and
- a switch that alternately switches whether or not the capacitor is connected to a power,
- wherein the switch further switches whether the capacitor and the voltage divider capacitor are connected in parallel or in series.
1 more element
Dependencies are inferred from the claim text.