Electric lamp and discharge devices: systems – Condenser in the supply circuit – Electric switch in the condenser circuit
Patent
1988-07-06
1990-06-05
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Electric switch in the condenser circuit
315239, 315291, 315DIG4, H05B 4142
Patent
active
049317016
ABSTRACT:
A bi-level ballast network is disclosed for operating an HID lamp at either a low power or standby level and at a high power or full light level. The network includes an unswitched capacitor connected to the transformer ballast coil and a switched capacitor connected to a solid state relay (SSR) circuit, the electronic components providing the switching therein being back-to-back SCR's. When the SSR is operated the contacts connected to the switched capacitor open or close at the next subsequent zero crossing of the applied ac source voltage. This changes the capacitance of the network to increase the power to the lamp or decrease the power thereto depending on the operating condition prior to the SSR being operated. Current, voltage and dvdt protection devices are also provided.
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LaRoche Eugene R.
Wide-Lite International Corporation
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