Switching device

Details Switching device Switching device

1990-05-15

1991-10-01

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315224, 315307, 315DIG7, H05B 4136, H05B 3702

Patent

active

050536800

ABSTRACT:
A switching device for operating a lamp (4) by means of a pulse-shaped voltage (V1) in which switching means (3) generate the pulse-shaped voltage (V1) from an input voltage. The amplitude of the pulse-shaped voltage (V1) is proportional to the input voltage. A pulse width modulator (2) supplies control pulses to the switching means and a first auxiliary circuit (S1) generates a first signal that is derived from the pulse-shaped voltage (V1). The first signal is proportional to the average value of the pulse-shaped voltage. A control device (1) makes the first signal substantially equal to a second signal by supplying a control signal to the pulse width modulator. A second auxiliary circuit (S2) generates the second signal, which is inversely proportional to the input voltage, whereby the switching device is able to operate the lamp at a voltage with a constant effective value.

REFERENCES:
patent: 4156166 (1979-05-01), Shapiro et al.
patent: 4230970 (1980-10-01), Potter et al.

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