Title:
ロスレススイッチングを有する高力率電子バラスト
Document Type and Number:
Japanese Patent JP2005512491
Kind Code:
A
Abstract:
An electronic converter receiving low frequency input power, converting this power to DC power at a voltage greater than the input voltage peak, and providing output power from a commutator stage. Lossless switching of the power semiconductor devices in the input stage is achieved by turning each device on at an instant when voltage across the device's current terminals is zero. Current through a main inductor of the input circuit is triangular and substantially unidirectional for at least a few high frequency cycles. To ensure lossless switching, current through the main inductor of the input circuit may be reversed briefly before switching. For use as an electronic arc lamp ballast, the commutator stage also uses lossless switching, and substantially unidirectional triangular current through an output inductor is reversed periodically.
Inventors:
Eric Bashen
Application Number:
JP2003550562A
Publication Date:
April 28, 2005
Filing Date:
November 14, 2002
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
H02M3/155; H05B41/288; H05B41/24; (IPC1-7): H02M7/48; H02M3/155; H05B41/24
Attorney, Agent or Firm:
Kosaku Sugimura
Kazuaki Takami
Hiroshi Tokunaga
Shiro Fujitani
Kiyoshi Kuruma
Kazuyuki Tomita
Kazuaki Takami
Hiroshi Tokunaga
Shiro Fujitani
Kiyoshi Kuruma
Kazuyuki Tomita