发明名称 |
Switching power supply circuit having constant output for a wide range of input voltage |
摘要 |
A switching power supply is disclosed using a single transistor circuit which provides a constant output voltage for a range of input voltages extending from a nominal 115 volt power supply to a nominal 220/240 volt power supply without requiring a change in the circuit configuration throughout the range of input voltages. The circuit is disclosed in connection with a single transistor forward converter circuit, in which the transformer winding of the converter circuit is provided with a uni-directional clamp to prevent the transformer voltage of a given polarity from exceeding the clamping voltage magnitude. By clamping one polarity of the transformer voltage which is in series with the switching transistor, the maximum peak-to-peak voltage on the transistor is reduced from that which would be produced in the absence of clamping and enables the use of a power MOSFET transistor for the circuit. The clamping circuit is disclosed as a zener clamp and as a circuit including a parallel resistor and capacitor and series diode.
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申请公布号 |
US4389702(A) |
申请公布日期 |
1983.06.21 |
申请号 |
US19820412103 |
申请日期 |
1982.08.27 |
申请人 |
INTERNATIONAL RECTIFIER CORPORATION |
发明人 |
CLEMENTE, STEFANO;PELLY, BRIAN R.;RUTTONSHA, RUTTON |
分类号 |
H02M1/10;H02M3/335;(IPC1-7):H02M3/33 |
主分类号 |
H02M1/10 |
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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