| 摘要 |
<p>A pulse width modulation (PWM) controlled digital analog dimmer includes a filter and rectifier circuit (1), a +5V direct current circuit (2), a +12V direct current circuit (3), a time base synchronous circuit (6), a short circuit and overload protection circuit (10), a panel control function key circuit (7) and a PWM generator circuit (4) and a 7555 trigger (5) and a field effect transistor circuit (11) and a lighting display circuit (9). Wherein, the PWM generator circuit (4) includes a single chip microcomputer, a PWM signal generated by the single chip microcomputer is converted and coupled to realize pulse width control and timing control of the 7555 trigger (5), thereby to realize on off timing control of a field effect transistor in the field effect transistor circuit (11), so as to realize the lighting strength adjustment of a load (12).</p> |
