Bi-level ballast circuit for operating hid lamps

Details Bi-level ballast circuit for operating hid lamps Bi-level ballast circuit for operating hid lamps

H - Electricity

05

B

315/44

H05B 41/38 (2006.01) H05B 41/42 (2006.01)

Patent

CA 1288803

BI-LEVEL BALLAST CIRCUIT FOR OPERATING HID LAMPS Abstract of the disclosure 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.

592785

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