Patent ID: 9426869
Filing Date: 2016-08-23
CPC Classification: H05B

Claim Text:
1. A multi-output electronic ballast for driving a plurality of lamp assemblies, comprising: an AC/DC converter coupled to an AC power supply to receive an AC input voltage and configured to output a high DC voltage to a DC bus; a first inverter configured to receive the high DC voltage from the DC bus and to output a high-frequency first AC voltage for driving a first lamp assembly; a second inverter configured to receive the high DC voltage from the DC bus and to output a high-frequency second AC voltage for driving a second lamp assembly; an auxiliary voltage generator configured to generate an auxiliary DC voltage; and a control circuit coupled to the AC power supply and configured to output a control DC voltage for controlling the operation of the first inverter based on a state of a first switch, the first switch being connected in series between the control circuit and the AC power supply, wherein the control circuit generates the control DC voltage from one of the high DC voltage from the DC bus or the auxiliary DC voltage when the first switch is closed and does not generate the control DC voltage when the first switch is open.