发明名称 |
Voltage supply circuit responsive to plural possible DC input levels |
摘要 |
A voltage supply circuit comprises an input for receiving a DC input voltage having one of plural possible levels; a DC-AC inverter for inverting the DC input voltage and which includes a boosting transformer having a winding with end terminals and an intermediate terminal and an inverter drive circuit for providing an AC current to the transformer; a connection between the input and the intermediate terminal of the boosting transformer for applying the DC input voltage to the latter; and a control circuit for controlling the inverter drive circuit, and which selects between a first condition, in which the inverter drive circuit is made operative so that a boosted voltage is provided at one end terminal of the boosting transformer, and a second condition, in which the inverter drive circuit is made inoperative, so that the DC input voltage introduced at the intermediate terminal is provided as a DC output voltage at the end terminal of the booster transformer. The control circuit can include a zener diode as a level detector to control a switching transistor so that the first and second conditions are selected on the basis of the level of the DC input voltage.
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申请公布号 |
US4163278(A) |
申请公布日期 |
1979.07.31 |
申请号 |
US19770860078 |
申请日期 |
1977.12.13 |
申请人 |
SONY CORP |
发明人 |
MATSUURA, KATSUJI;ONOUE, YOSHINORI;TAKAHASHI, SHIGENORI |
分类号 |
H02M3/155;H02M3/335;(IPC1-7):H02M3/33 |
主分类号 |
H02M3/155 |
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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