Circuit arrangement

Details Circuit arrangement Circuit arrangement

H - Electricity

02

M

315/68, 321/83

H02M 7/06 (2006.01) H02M 7/217 (2006.01)

Patent

CA 1183205

ABSTRACT The output of a load, e.g. an incandescent lamp, connec- ted to an A.C. power source is maintained constant for varying supply voltages by decreasing the duration of current pulses con- ducted by a transistor as the supply voltage rises. The transis- tor is connected in series with the load and is controlled by an operational amplifier. One input of the operational amplifier is fed with a rectified unsmoothed A.C. voltage derived from the supply voltage and the other input is fed with a voltage which is the sum of a D.C. voltage held constant by a zener diode and a superposed rectified and smoothed voltage varying with the supply voltage.

414657

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