Title:
回路装置
Document Type and Number:
Japanese Patent JP2004512663
Kind Code:
A
Abstract:
A ballast circuit comprises an inverter formed by a bridge circuit. The power consumed by a lamp connected to the ballast circuit is controlled by controlling the duty cycles of control signals that drive the bridge switches. The duty cycle is proportional to digital signals generated by a pulse duration modulator included in a microprocessor. To increase the number of settings to which the lamp power can be set, the digital signals are modulated.
Inventors:
Bayay Marcel
Buay Arnold W
Aende Kerk Ever Earld MJ
Langeslag Wilhelms Hm
Buay Arnold W
Aende Kerk Ever Earld MJ
Langeslag Wilhelms Hm
Application Number:
JP2002538724A
Publication Date:
April 22, 2004
Filing Date:
October 18, 2001
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
H05B41/392; H05B41/40; (IPC1-7): H05B41/40; H05B41/392
Attorney, Agent or Firm:
Susumu Tsugaru
Akihiko Miyazaki
Hiroyoshi Aoki
Akihiko Miyazaki
Hiroyoshi Aoki