发明名称 |
POWER SUPPLY DEVICE AND SEMICONDUCTOR DEVICE |
摘要 |
Switching loss is reduced by decreasing the switching frequency of a PFC power supply in light load condition, whereas the switching frequency is maintained high in heavy load operation. Efficiency in light load operation is thus improved without enlarging a boosting inductor and an output smoothing capacitor. A capacitor is provided in a triangular wave generating circuit and the triangular wave generating circuit outputs a triangular wave by charging and discharging this capacitor. Charging and discharging of the capacitor are controlled by an oscillation frequency control circuit output current which is input to a comparator. |
申请公布号 |
US2011255319(A1) |
申请公布日期 |
2011.10.20 |
申请号 |
US201113052409 |
申请日期 |
2011.03.21 |
申请人 |
RENESAS ELECTRONICS CORPORATION |
发明人 |
AYUKAWA KAZUHITO;KASAI NOBUTOSHI;IIJIMA DAISUKE |
分类号 |
H02M7/06 |
主分类号 |
H02M7/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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