LED DRIVING CIRCUIT
First Claim
1. A LED driving circuit, which is adapted to be coupled to a power supply via a phase control dimmer, comprising a power switch unit and a control unit, the control unit comprising a first signal sampling module, a frequency converting module, a feedback module and a PWM module, whereinthe first signal sampling module is configured to sample a first signal, which signal represents phase modulation information of electric power provided by the power supply when the electric power is modulated by the dimmer, and to provide the first signal to the frequency converting module;
- the frequency converting module is configured to generate a second signal in response to the first signal and to provide the second signal to the PWM module, the frequency of the second signal being determined by the average signal intensity of the first signal;
the feedback module is configured to sample a third signal, which signal represents the output current of the power switch unit, and to provide the third signal to the PWM module;
the PWM module is configured to generate a fourth signal in response to the second signal and the third signal, so as to control the output current of the power switch unit, the frequency of the fourth signal being determined by the second signal and the duty cycle of the fourth signal being determined by the third signal.
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Abstract
The present invention provides a LED driving circuit, which is adapted to be coupled to a power supply via a phase control dimmer. The driving circuit comprises a power switch unit and a control unit, wherein the control unit comprises a first signal sampling module, a frequency converting module, a feedback module and a PWM module, the first signal sampling module being configured to sample a first signal and to provide the first signal to the frequency converting module; the frequency converting module being configured to generate a second signal in response to the first signal and to provide the second signal to the PWM module; and the feedback module being configured to sample a third signal and to provide the third signal to the PWM module; the PWM module being configured to generate a fourth signal in response to the second signal and the third signal, so as to control the output current of the power switch unit, the frequency of the fourth signal being determined by the second signal and the duty cycle of the fourth signal being determined by the third signal.
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Citations
14 Claims
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1. A LED driving circuit, which is adapted to be coupled to a power supply via a phase control dimmer, comprising a power switch unit and a control unit, the control unit comprising a first signal sampling module, a frequency converting module, a feedback module and a PWM module, wherein
the first signal sampling module is configured to sample a first signal, which signal represents phase modulation information of electric power provided by the power supply when the electric power is modulated by the dimmer, and to provide the first signal to the frequency converting module; -
the frequency converting module is configured to generate a second signal in response to the first signal and to provide the second signal to the PWM module, the frequency of the second signal being determined by the average signal intensity of the first signal; the feedback module is configured to sample a third signal, which signal represents the output current of the power switch unit, and to provide the third signal to the PWM module; the PWM module is configured to generate a fourth signal in response to the second signal and the third signal, so as to control the output current of the power switch unit, the frequency of the fourth signal being determined by the second signal and the duty cycle of the fourth signal being determined by the third signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification