发明名称 |
SWITCHING POWER SUPPLY UNIT |
摘要 |
A switching power supply unit comprises a DC power supply; a transformer having a primary winding, a secondary winding and a feedback winding, a main switching element connected in series to the primary winding to be turned on by a voltage generated at the feedback winding, and a voltage dropping circuit for dropping the output voltage obtained form the secondary winding to reduce a fly-back voltage so that the voltage of a control terminal of the main switching element is maintained at a lower value than a threshold voltage of the main switching element.
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申请公布号 |
CA2295382(C) |
申请公布日期 |
2003.07.22 |
申请号 |
CA20002295382 |
申请日期 |
2000.01.14 |
申请人 |
MURATA MANUFACTURING CO., LTD. |
发明人 |
NISHIDA, AKIO;NAKAHIRA, KOJI |
分类号 |
H02J1/00;H02J9/00;H02M3/28;H02M3/335;H02M3/338;H02M7/217;(IPC1-7):H02M7/217 |
主分类号 |
H02J1/00 |
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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