| 摘要 |
A dimmable control circuit, having an ac power source; a transformer; a rectifier circuit; a dimmable control chip; a voltage dividing circuit; a dimmable switch; a first resistor; a second resistor; and a half bridge power driving circuit, capable of outputting signals to drive a fluorescent tube, characterized in that the said dimmable switch has a coactive variable resistor connected in parallel with the first resistor and the second resistor, and both the first resistor and the second resistor have the negative resistance temperature coefficient to achieve low temperature startup and high temperature operation.
|
