LIGHTING APPARATUS, DRIVING CIRCUIT OF LIGHT EMITTING DIODE AND DRIVING METHOD THEREOF
First Claim
1. A driving circuit, suitable for receiving an alternating current (AC) power to drive a light emitting diode (LED), the driving circuit comprising:
- a rectifier circuit, for rectifying the AC power to output a first operating voltage;
a processing unit, coupled to the rectifier circuit, for outputting a second operating voltage and a pulse width modulation (PWM) signal;
an electric energy conversion circuit, coupled between the rectifier circuit, the processing unit, and the LED, for driving the LED according to the PWM signal; and
a detection unit, coupled to the rectifier circuit and the processing unit, for detecting the first operating voltage, wherein when the first operating voltage is lower than or equal to a threshold voltage, the detection unit outputs a disable signal to the processing unit to disable the PWM signal.
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Accused Products
Abstract
A driving circuit suitable for receiving an alternating current (AC) power to drive a light emitting diode (LED) is provided. The driving circuit includes a rectifier circuit, a process unit, an electric energy conversion circuit, and a detection unit. The rectifier circuit rectifies the AC power to output a first operating voltage. The processing unit is coupled to the rectifier circuit and outputs a second operating voltage and a pulse width modulation (PWM) signal. The electric energy conversion circuit is coupled between the rectifier circuit, the processing unit and the LED and drives the LED according to the PWM signal. The detection unit is coupled to the rectifier circuit and the processing unit and detects the first operating voltage. When the first operating voltage is lower than or equal to a threshold voltage, the detection unit outputs a disable signal to the processing unit to disable the PWM signal.
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Citations
23 Claims
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1. A driving circuit, suitable for receiving an alternating current (AC) power to drive a light emitting diode (LED), the driving circuit comprising:
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a rectifier circuit, for rectifying the AC power to output a first operating voltage; a processing unit, coupled to the rectifier circuit, for outputting a second operating voltage and a pulse width modulation (PWM) signal; an electric energy conversion circuit, coupled between the rectifier circuit, the processing unit, and the LED, for driving the LED according to the PWM signal; and a detection unit, coupled to the rectifier circuit and the processing unit, for detecting the first operating voltage, wherein when the first operating voltage is lower than or equal to a threshold voltage, the detection unit outputs a disable signal to the processing unit to disable the PWM signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A lighting apparatus, suitable for receiving an AC power to provide illumination, the lighting apparatus comprising:
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a LED; and a driving circuit, coupled to the LED, the driving circuit comprising; a rectifier circuit, for rectifying the AC power to output a first operating voltage; a processing unit, coupled to the rectifier circuit, for outputting a second operating voltage and a PWM signal; an electric energy conversion circuit, coupled between the rectifier circuit, the processing unit, and the LED, for driving the LED according to the PWM signal; and a detection unit, coupled to the rectifier circuit and the processing unit, for detecting the first operating voltage, wherein when the first operating voltage is lower than or equal to a threshold voltage, the detection unit outputs a disable signal to the processing unit to disable the PWM signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A driving method of a LED, comprising:
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rectifying an AC power to output an operating voltage; receiving the operating voltage and a PWM signal; outputting a driving signal according to the operating voltage and the PWM signal to drive the LED; and detecting the operating voltage, and disabling the PWM signal to stop driving the LED if the operating voltage is lower than or equal to a threshold voltage.
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Specification