发明名称 |
CAPACITOR CHARGING METHODS AND APPARATUS |
摘要 |
A capacitor charging circuit is provided with a primary side output voltage sensing circuit including an RC network having an RC time constant with a predetermined relationship to the RC time constant of the output capacitor. Once the capacitor voltage reaches a fully charged level, the charging mode is terminated. The output voltage is continuously detected by measuring the voltage across the primary side RC network that decays at a predetermined rate with respect to the output capacitor and the charging mode is commenced once the RC voltage falls to a predetermined level. According to a further aspect of the invention, a switch control circuit in a flyback converter controls the switch off time in response to detection of a change in the slope polarity of the voltage at a terminal of the switch. ® KIPO & WIPO 2009
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申请公布号 |
KR20090092297(A) |
申请公布日期 |
2009.08.31 |
申请号 |
KR20097013064 |
申请日期 |
2007.10.15 |
申请人 |
ALLEGRO MICROSYSTEMS, INC. |
发明人 |
MANGTANI VIJAY;LEE NAI CHI;TSAI TSENG NAN;HUMENICK JOHN |
分类号 |
H02M3/335 |
主分类号 |
H02M3/335 |
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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