Light flicker eliminating circuit
First Claim
1. Voltage regulating circuit for an electric generator driven by an internal combustion engine having a drive shaft the rotational speed of which is periodically higher in a power stroke than in an exhaust stroke, said circuit comprising an output transformer having an input connected with the output of said generator, an output connected with a load and a control winding, control circuit means connected with said control winding to control the flow of current therethrough and thereby modify the output voltage of said transformer and means synchronized with said engine for cyclically implementing said control circuit to reduce the output voltage of said secondary winding during the power stroke of said engine to a value equal to said voltage during the exhaust stroke.
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Accused Products
Abstract
A voltage regulating circuit for eliminating flicker in lights fed by an electric generator driven by an internal combustion engine comprises a transformer having an input connected in series with the output of the generator and with the lights, and a control winding connected in a control circuit. The control circuit comprises a resistor and a transistor or solid state switch for shorting the resistor except during the power strokes of the engine when the engine speed and hence the voltage of the generator are cyclically higher. The voltage at the output of the transformer is thereby reduced during the power strokes of the engine to a value substantially equal to the voltage during exhaust strokes, thereby eliminating visible flicker in the lights.
7 Citations
10 Claims
- 1. Voltage regulating circuit for an electric generator driven by an internal combustion engine having a drive shaft the rotational speed of which is periodically higher in a power stroke than in an exhaust stroke, said circuit comprising an output transformer having an input connected with the output of said generator, an output connected with a load and a control winding, control circuit means connected with said control winding to control the flow of current therethrough and thereby modify the output voltage of said transformer and means synchronized with said engine for cyclically implementing said control circuit to reduce the output voltage of said secondary winding during the power stroke of said engine to a value equal to said voltage during the exhaust stroke.
Specification