Cost effective high performance circuit for driving a gas discharge lamp load

Patent 5608295 Issued on March 4, 1997. Estimated Expiration Date:

September 2, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventor

Moisin, Mihail S.

Assignee

Valmont Industries, Inc.

Application

No. 299124 filed on 09/02/1994

US Classes:

315/247, With power factor control device315/209R, PERIODIC SWITCH IN THE SUPPLY CIRCUIT315/219, Periodic switch in the primary circuit of the supply transformer315/278, Three or more coil-type transformers315/307, Automatic regulation315/324, Plural discharge device loads323/205, FOR REACTIVE POWER CONTROL323/207, Using converter363/44, In rectifier systems363/84For rectifier system

Examiners

Primary: Lee, Benny
Assistant: Kinkead, Arnold

Attorney, Agent or Firm

Zarley, McKee, Thomte, Voorhees & Sease

Foreign Patent References

0093469 EP 11/19/1983
0599405A1 EP. 06/19/1994
599405 EP. 06/19/1994
0606665A1 EP. 07/19/1994
2700434 FR. 07/19/1994
2106339 GB 04/19/1983
9204808 WO. 03/19/1992
WO92/22186 WO 12/19/1992
WO93/07732 WO. 04/19/1993

International Classes

H05B 037/02
H05B 041/29

Abstract

A circuit for driving a gas discharge lamp load and including an EMI and transient supply filter coupled to an input source, a rectifier coupled to the filter, a power inverter coupled to the rectifier, a load including a transformer coupled to the power inverter, and a control circuit coupled to the power inverter and the load. A feedback circuit couples the load transformer to the AC side of the rectifier to create a path for transferring a feedback voltage over the rectifier to cause the rectifier to conduct current over a substantive portion of each cycle of the AC input voltage.