发明名称 |
Switching power supply having a high efficiency starting circuit |
摘要 |
A switching power supply having a high efficiency starting circuit uses a field effect transistor to provide initial starting current to a pulse width modulated signal generator within a switching control circuit. The field effect transistor (FET) has a drain connected to a source of supply voltage, a source connected to the PWM signal generator, and a gate connected to a feedback voltage that is derived from an output voltage of the switching power supply. During start up of the switching power supply, the FET provides current to the PWM signal generator. When the feedback voltage reaches a predetermined level, the FET supplies substantially near zero current to the PWM signal generator, thereby eliminating the electrical inefficiencies typically associated with a conventional switching power supply starting circuit.
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申请公布号 |
US6125046(A) |
申请公布日期 |
2000.09.26 |
申请号 |
US19990435290 |
申请日期 |
1999.11.05 |
申请人 |
FAIRFIELD KOREA SEMICONDUCTOR LTD. |
发明人 |
JANG, KYUNG-OUN;SHIN, DONG-MYEONG;KIM, DAE-BONG;KIM, CHANG-HO |
分类号 |
H02M1/00;H02M1/36;(IPC1-7):H02M3/335 |
主分类号 |
H02M1/00 |
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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