Electronic Ballast with inverter protection circuit

Details Electronic Ballast with inverter protection circuit Electronic Ballast with inverter protection circuit

1997-12-03

1999-03-16

Wong, Don

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch cut-out

315209R, 315219, 315291, 315307, 315308, 315DIG5, 315DIG7, 315224, H05B 4114

Patent

active

058834737

ABSTRACT:
An electronic ballast (10) comprising an AC-to-DC converter (100), an inverter (200), an output circuit (400), a high-voltage detection circuit (500), and a no-load detection suit (600). The inverter (200) includes an inverter control circuit (300) that monitors the lamp(s) via the high-voltage detection circuit (500) and the no-load detection circuit (600), and that terminates inverter switching in response to various lamp-fault conditions such as "diode-mode" behavior. Inverter control circuit (300) also provides for automatic ignition of a replaced lamp and may be economically implemented as a single integrated circuit.

REFERENCES:
patent: 5089753 (1992-02-01), Mattas
patent: 5140229 (1992-08-01), Yagi et al.
patent: 5650694 (1997-07-01), Jayaraman et al.
patent: 5739645 (1998-04-01), Xia et al.

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