Patent ID: 8441205

Claim:
A dimming apparatus transmitting control signals with AC power line ( 10 ) applied to an alternating current power source ( 20 ), a light emitting diode driving power unit ( 40 ), and a light emitting diode unit ( 30 ), the light emitting diode unit ( 30 ) being electrically connected to the light emitting diode driving power unit ( 40 ), the dimming apparatus transmitting control signals with AC power line ( 10 ) including: an input voltage detection unit ( 102 ) electrically connected to the alternating current power source ( 20 ); a one-shot signal unit ( 104 ) electrically connected to the input voltage detection unit ( 102 ), a low voltage signal ( 126 ) being sent from the input voltage detection unit ( 102 ) to the one-shot signal unit ( 104 ) when the alternating current power source ( 20 ) is detected by the input voltage detection unit ( 102 ) to be at a low voltage; an AND gate unit ( 106 ) electrically connected to the one-shot signal unit ( 104 ), a one-shot signal ( 128 ) being sent from the one-shot signal unit ( 104 ) to the AND gate unit ( 106 ) when the low voltage signal ( 126 ) is received by the one-shot signal unit ( 104 ); a pulse width modulation dimming signal unit ( 108 ) electrically connected to the AND gate unit ( 106 ), a pulse width modulation dimming signal ( 130 ) being sent from the pulse width modulation dimming signal unit ( 108 ) to the AND gate unit ( 106 ); an inductor unit ( 110 ) electrically connected to the alternating current power source ( 20 ) and the input voltage detection unit ( 102 ); a first switch unit ( 114 ) electrically connected to the inductor unit ( 110 ) and the AND gate unit ( 106 ), the first switch unit ( 114 ) being controlled by the AND gate unit ( 106 ) after the one-shot signal ( 128 ) and the pulse width modulation dimming signal ( 130 ) are operated by the AND gate unit ( 106 ) with AND gate logic operation, the inductor unit ( 110 ) being charged by the alternating current power source ( 20 ) when the first switch unit ( 114 ) is conducted, the alternating current power source ( 20 ) being discharged by the inductor unit ( 110 ) when the first switch unit ( 114 ) is not conducted, an alternating current dimming signal ( 132 ) being generated from the combination of the charge-discharge of the inductor unit ( 110 ) and the alternating current power source ( 20 ); a dimming signal recovery unit ( 124 ) electrically connected to the light emitting diode driving power unit ( 40 ), the inductor unit ( 110 ), and the first switch unit ( 114 ); and a second switch unit ( 122 ) electrically connected to the dimming signal recovery unit ( 124 ) and the light emitting diode unit ( 30 ), wherein the second switch unit ( 122 ) is controlled by the dimming signal recovery unit ( 124 ) with the pulse width modulation dimming signal ( 130 ) recovered by the dimming signal recovery unit ( 124 ) to dim the light emitting diode unit ( 30 ) after the alternating current dimming signal ( 132 ) is received by the dimming signal recovery unit ( 124 ).