Power control circuits for luminaires

Details Power control circuits for luminaires Power control circuits for luminaires

H - Electricity

05

B

H05B 41/36 (2006.01) H05B 41/18 (2006.01) H05B 41/231 (2006.01) H05B 41/40 (2006.01)

Patent

CA 2314023

Load power control circuits for single HID luminaires include both retrofit circuitry and "new manufacture" circuitry for connection to both controlled-voltage and controlled-current ballast circuits. A suitable such control circuit may be substituted for the capacitor in the capacitor-control type of ballast circuit. Control is effected by a microcontroller that controls selective switching by associated triacs of one or more capacitors connected in parallel across the ballast circuit. The reactor-control type of control circuit is interposed between the line supply and the ballast circuit, and may include parallel- connected pairs of opposed (reverse-coupled) silicon controlled rectifiers operating under the control of the microprocessor.

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