Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
負荷制御システム
Document Type and Number:
Japanese Patent JP4272245
Kind Code:
B2
Abstract:
A phase controlled dimming system having an active filter for receiving the AC line voltage waveform, and for recovering the AC fundamental waveform therefrom is disclosed. The recovered AC fundamental waveform is supplied to a zero crossing detector that provides zero crossing indications of the AC fundamental waveform. The recovered AC fundamental is substantially free of noise or distortion, and of frequency components greater than at least second order harmonics, that may be present on the AC line voltage waveform, and that might otherwise result in faulty or incorrect zero crossing detection. An output of the zero crossing detector is supplied to a microprocessor that controls the gating of a controllably conductive device interposed between the controlled load and the AC source based on the zero crossing information. The filter may take an analog or digital (software) form.

Inventors:
Newman, Robert Sea. Jr.
Houseman, Donald F.
Mosley, Robin Sea.
Application Number:
JP2007238444A
Publication Date:
June 03, 2009
Filing Date:
September 13, 2007
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
Ratron Electronics Company, Incorporated
International Classes:
H02M1/12; G05F1/455; H02M1/08; H02M5/257; H05B39/08
Domestic Patent References:
JP57206932A
JP5244774A
JP9064687A
JP9199994A
JP8317562A
JP63277468A
JP9019058A
Foreign References:
EP1018208B1
Other References:
P.Horowitz, W.Hill,THE ART OF ELECTRONICS,Cambridge University Press,1980年,第1版,148-163
Attorney, Agent or Firm:
Atsushi Aoki
Jun Tsuruta
Tetsuro Shimada
Shimichi Akihisa
Kurachi Yasuyuki