TRIAC DIMMER COMPATIBLE WLED DRIVING CIRCUIT AND METHOD THEREOF
First Claim
Patent Images
1. A while light emitting diode (WLED) driving circuit, comprising:
- a Triac dimmer configured to receive an input alternating current (AC) supply voltage and to provide an output AC voltage having a plurality of regulated conduction angles;
an electronic transformer configured to receive said output AC voltage and to convert said output AC voltage into a pulse width modulation (PWM) direct current (DC) voltage, wherein said PWM DC voltage having a duty cycle; and
a WLED driver configured to receive said PWM DC voltage and to provide a WLED driving signal;
whereinsaid electronic transformer detects said plurality of regulated conduction angles of said output AC voltage and regulates the duty cycle of said PWM DC voltage based on said plurality of regulated conduction angles.
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Abstract
The present technology is generally related to Triac dimmer compatible driving circuits and methods thereof. The present technology also provides an electronic transformer that is integrated in the Traic dimmer compatible driving circuit. In one embodiment, the electronic transformer detects the conduction angles of an output AC voltage from the Triac dimmer and converts said output AC voltage into a PWM DC voltage having a duty cycle regulated by said conduction angles. Said PWM DC voltage is then applied to a WLED driver for driving a WLED.
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Citations
17 Claims
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1. A while light emitting diode (WLED) driving circuit, comprising:
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a Triac dimmer configured to receive an input alternating current (AC) supply voltage and to provide an output AC voltage having a plurality of regulated conduction angles; an electronic transformer configured to receive said output AC voltage and to convert said output AC voltage into a pulse width modulation (PWM) direct current (DC) voltage, wherein said PWM DC voltage having a duty cycle; and a WLED driver configured to receive said PWM DC voltage and to provide a WLED driving signal;
whereinsaid electronic transformer detects said plurality of regulated conduction angles of said output AC voltage and regulates the duty cycle of said PWM DC voltage based on said plurality of regulated conduction angles. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A while light emitting diode (WLED) driving method, comprising:
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providing an AC supply voltage to a Triac dimmer and generating an output AC voltage having a plurality of regulated conduction angles; converting said output AC voltage having said plurality of regulated conduction angles into a pulse width modulation (PWM) direct current (DC) voltage having a duty cycle; applying said PWM DC voltage to a WLED driver to control said WLED driver to output a WLED driving signal; and detecting said plurality of regulated conduction angles of said output AC voltage and regulating the duty cycle of said PWM DC voltage based on said plurality of regulated conduction angles. - View Dependent Claims (9, 10)
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11. An electronic transformer for receiving an AC voltage having a plurality of regulated conduction angles, and to provide a PWM DC voltage having a duty cycle, comprising:
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a conduction angle detection module configured to detect said plurality of regulated conduction angles of said AC voltage; and a control module configured to regulate said duty cycle of said PWM DC voltage in accordance with the said plurality of regulated conduction angles. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification