US 9,426,869 B2Granted

Multi-output electronic ballast

AssigneeDelta Electronics, Inc.

InventorsChing-Ho Chou, Yung-Chuan Lu

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Abstract

A multi-output electronic ballast is disclosed. The multi-output electronic ballast is used to drive a plurality of lamp assemblies and includes an AC/DC converter, a first inverter, a second inverter, an auxiliary voltage generator, and a control circuit. The AC/DC converter converts an AC input voltage to a high DC voltage. The first inverter converts the high DC input voltage to a first AC voltage selectively. The second inverter converts the high DC voltage to a second AC voltage. The auxiliary voltage generator generates an auxiliary voltage. The control circuit receives the auxiliary voltage generating circuit and outputs a control signal to the first inverter according to the switching operation of a first external switch. When the control signal is transmitted to the first inverter, the first inverter comes into operation and converts the high DC voltage to the first AC voltage.

Claims13

Dependent claims

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.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/231,337Filed 13 Sep 2011
Priority: TW 100110667 A28 Mar 2011
Published: US 2012/0248980 A14 Oct 2012
Granted: 23 Aug 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

H05B 41/28
In which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC: using static converters
H05B 41/295
Using static converters: with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
H05B
Electric heating