Title:
A DIMMING CONTROL SIGNAL TRANSMISSION CIRCUIT OF THE ELECTRONIC DIMMING BALLAST
Document Type and Number:
WIPO Patent Application WO/2008/138223
Kind Code:
A1
Abstract:
The invention discloses a dimming control signal transmission circuit of the
electronic dimming ballast comprising: a dimming switch circuit, a positive
half cycle checkout voltage division circuit, a negative half cycle checkout
voltage division circuit and a digital potentiometer. The AC power supply passes
through the dimming switch circuit, connecting a control input of the digital
potentiometer through the positive half cycle checkout voltage division circuit
and connecting another control input of the digital potentiometer through the
negative half cycle checkout voltage division circuit at the same time. The trigger
state of the switch of the dimming switch circuit is changed, and then the positive
half cycle checkout voltage division circuit or the negative half cycle checkout
voltage division circuit is selected to be in work to change the high or low level
potential input to the two control inputs of the digital potentiometer. The digital
potentiometer determines the voltage output to dimming control terminal of
the dimming ballast circuit based the potential state of its two control inputs,
and changes its output power to adjust the luminance of the fluorescent lamp.
Inventors:
ZHANG BO (CN)
Application Number:
PCT/CN2008/000927
Publication Date:
November 20, 2008
Filing Date:
May 12, 2008
Export Citation:
Assignee:
ZHANG BO (CN)
International Classes:
H05B41/38
Foreign References:
| CN201042100Y | 2008-03-26 | |||
| CN1498055A | 2004-05-19 | |||
| CN1436029A | 2003-08-13 | |||
| US20020140373A1 | 2002-10-03 | |||
| US20030062854A1 | 2003-04-03 | |||
| DE29609335U1 | 1996-08-22 |
Attorney, Agent or Firm:
QINGDAO LZ PATENT TRADEMARK OFFICE CO., LTD. (Zhongshan RoadQingdao, Shandong 1, CN)
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