Patent ID: 9173264
Filing Date: 2015-10-27
Classification: H05B,Y02B

Abstract:
1. An LED control device for configuring a phase-cut dimming system according to an input signal; wherein the phase-cut dimming system comprises an LED and a current switch; comprising: a current control circuit for coupling with the current switch, and for generating a second output signal according to a current flowing through the current switch; a driving signal generating circuit for coupling with a control terminal of the current switch and the current control circuit, and for generating a driving signal to configure a conduction status of the current switch according to the second output signal and a periodic signal; and a phase-cut detection circuit for receiving the input signal, and for comparing the input signal with a second reference signal; wherein in a first period in which the input signal is greater than the second reference signal, the phase-cut detection circuit configures a signal value of a second storage device to vary with the second output signal; in a second period in which the input signal is less than the second reference signal, the phase-cut detection circuit configures the second storage device to keep the signal value of the second storage device so as not to vary with the second output signal; in a third period in which the input signal is greater than the second reference signal, the phase-cut detection circuit configures the signal value of the second storage device to vary with the second output signal; and the second storage device is configured to be operably coupled with the current control circuit and the driving signal generating circuit, and wherein the current control circuit generates a first output signal according to the current flowing through the current switch and generates the second output signal according to the first output signal and a first reference signal; in the first period, the phase-cut detection circuit configures a signal value of a first storage device to vary with the first output signal; in the second period, the phase-cut detection circuit configures the first storage device to keep the signal value of the first storage device so as not to vary with the first output signal; in the third period, the phase-cut detection circuit configures the signal value of the first storage device to vary with the first output signal; the first storage device is configured to be operably coupled with the current control circuit; and the first storage device is configured to be in at least one of the interior of the LED control device and the exterior of the LED control device.