SCR Lamp supply trigger circuit

Details SCR Lamp supply trigger circuit SCR Lamp supply trigger circuit

1979-10-12

1981-04-14

Smith, Alfred E.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315199, 315209SC, 315240, 315DIG7, 355 69, G05F 100, H05B 4136, H05B 3702, H05B 3100

Patent

active

042622344

ABSTRACT:
A silicon controlled rectifier (SCR) lamp supply trigger circuit, responsive to control circuitry, produces trigger currents for the SCR which transmits the required voltage to illumination lamps in a document image capturing system. The trigger circuit includes a single AC input supply voltage having a positive and negative portion and electronic components for accumulating the respective voltage portions and isolating them to avoid unwanted signal interference with the control circuitry regulating the lamp supply voltage. Devices discharge the voltage accumulating components in response to the control circuitry of the SCR lamp supply and feed the discharged voltage to an apparatus for conversion to a current for triggering the SCR. Residual voltages remaining on the voltage accumulating components are automatically discharged during that portion of the AC input supply voltage which is opposite to the polarity of the charges stored on the voltage accumulating components. Furthermore, the trigger circuit provides for the gradual illumination of the lamps to prolong their serviceability.

REFERENCES:
patent: 3443154 (1969-05-01), Hoekstra et al.

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