发明名称 |
AN ACTIVE POWER FACTOR CORRECTION IC WITH 5 PINS |
摘要 |
Disclosed is an active power factor correction integrated circuit for a boost converter, comprising a bias voltage generator coupled to an external power source through a first pin, for generating internal bias voltages used for the integrated circuit; a zero crossing detector coupled magnetically to the inductor through a second pin, for detecting a time at which a voltage across the inductor is zero to provide a zero crossing detection signal; an oscillator reset by the zero crossing detection signal for generating a pulse signal; a flip-flop for generating a first control signal in response to the zero crossing detection signal or the pulse signal; a switching element responsive to the first control signal for enabling a boosted voltage to be provided to the load; an over-current detector for generating an over-current signal when a current flowing through the switching element is over a predetermined value; and a voltage variation detector for detecting variation of a load voltage to generate a variation detection signal and generating a second control signal enabling the boosted voltage to flow through the switching element to a ground in response to both the variation detection signal and the over-current signal. With the integrated circuit, the number of the IC pin and the number of the peripheral components thereof may be considerably reduced. |
申请公布号 |
KR152252(B1) |
申请公布日期 |
1999.05.01 |
申请号 |
KR19950041682 |
申请日期 |
1995.11.16 |
申请人 |
SAMSUNG ELECTRONICS CO, LTD. |
发明人 |
SUNG, HWAN-HO;KIM, SOO-KYUNG |
分类号 |
H02M7/217;H02M3/155;H02M3/28;H02M7/12 |
主分类号 |
H02M7/217 |
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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