Electric lamp and discharge devices: systems – Automatic substitution of the load device or electrode – Plural load devices with selective substitution of load...
Patent
1989-06-23
1991-01-15
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Automatic substitution of the load device or electrode
Plural load devices with selective substitution of load...
315 87, 315313, 307 38, H05B 4146
Patent
active
049856626
ABSTRACT:
An improved lamp switching circuit for switching on a second lamp circuit upon every alternate application of power to a first lamp circuit. A magnetic latching relay alternately connects and disconnects the second lamp circuit in parallel with the first whenever power to the circuit is switched off. The relay is powered by the discharge of one of two capacitors, which respectively operate a set circuit and a reset circuit of the latching relay. Only one of the capacitors is charged at any time. While power is applied to the lamp circuits, one capacitor is charged while the other is kept discharged, in preparation for operation of the latching relay. When power is switched off, a control circuit senses this condition and triggers a thyristor to discharge the capacitor through the corresponding relay coil after a short predetermined time delay. A low voltage regulated power supply is derived from the a.c. power to provide the power needed by the control circuit and to charge the capacitors, making the circuit operation reliable over a wide range of supply voltages and temperatures.
REFERENCES:
patent: 3636404 (1972-01-01), Appleton
patent: 4075501 (1978-02-01), Kondo
patent: 4318006 (1982-03-01), Himeno
patent: 4326133 (1982-04-01), Tasma
patent: 4700110 (1987-10-01), McNair
patent: 4888494 (1989-12-01), McNair
McNair Rhett
Willcocks Martin E. G.
Creighton Wray James
LaRoche Eugene R.
McNair Rhett
Zarabian Amir
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