| 摘要 |
A stepped dimming ballast comprising a filter and rectifier circuit ( 1 ), a DC high voltage stabilizing circuit ( 2 ), a frequency control and switch circuit ( 3 ), a load current feedback circuit ( 5 ), a voltage signal processing circuit ( 6 ) and a voltage signal sampling circuit ( 7 ). The present invention is adapted for use in conjunction with a silicon controlled rectifier dimmer and/or a regular light switch whereby it is novel in structure and able to effect dimming in two predetermined and reliable operation modes.
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