Title:
【発明の名称】フリッカ現象及び望ましくない強度変動を防止するため能動フィルタを用いた位相制御の調光システム
Document Type and Number:
Japanese Patent JP2001519639
Kind Code:
A
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.
More Like This:
| JPS5386452 | CONTACT-LESS SWITCHING CIRCUIT |
Inventors:
Newman, Robert Sea. Jr.
Houseman, Donald F.
Mosley, Robin Sea.
Houseman, Donald F.
Mosley, Robin Sea.
Application Number:
JP2000515323A
Publication Date:
October 23, 2001
Filing Date:
September 24, 1998
Export Citation:
Assignee:
Ratron Electronics Company, Incorporated
International Classes:
H02M1/08; H02M5/257; H05B39/08; (IPC1-7): H02M5/257; H02M1/08; H05B39/08
Attorney, Agent or Firm:
Takashi Ishida (4 others)