发明名称 |
Circuit arrangement for generating a pulsatory supply voltage for a load from a direct voltage |
摘要 |
A circuit arrangement for generating a pulsatory supply voltage for a load (1), such as a halogen incandescent lamp, from a source of direct voltage, in which a predetermined effective value of the supply voltage remains substantially constant in the case of a varying direct voltage. A switch (2) supplies the supply voltage from which a low-pass filter generates a mean value voltage. The mean value voltage is applied to a Schmitt trigger circuit (3) which controls the switch whose first switching threshold is constant and is derived from a reference voltage which is present at a first input of the Schmitt trigger circuit. A second switching threshold of the switch varies oppositely with respect to a decreasing direct voltage.
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申请公布号 |
US5027052(A) |
申请公布日期 |
1991.06.25 |
申请号 |
US19890321611 |
申请日期 |
1989.03.10 |
申请人 |
U.S. PHILIPS CORPORATION |
发明人 |
BAUCH, WOLF-DIETER;HELMUS, HEINZ;MERKER, HEINZ B. |
分类号 |
H05B37/02;H02M11/00;H05B39/04 |
主分类号 |
H05B37/02 |
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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