Circuit arrangement for generating a pulsatory supply voltage fo

Details Circuit arrangement for generating a pulsatory supply voltage fo Circuit arrangement for generating a pulsatory supply voltage fo

1989-03-10

1991-06-25

Stephan, Steven L.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323285, 315199, G05F 156

Patent

active

050270524

ABSTRACT:
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.

REFERENCES:
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patent: 4237405 (1980-12-01), Kellis
patent: 4360783 (1982-11-01), Nagasawa et al.
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patent: 4609976 (1986-09-01), Geissler
patent: 4774450 (1988-09-01), Kitamura
patent: 4849683 (1989-07-01), Flolid

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