Control circuit, control method and LED driver thereof
AssigneeSilergy Semiconductor Technology (Hangzhou) LTD
InventorsLongqi Wang, Jianxin Wang
Life of this patent
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Abstract
A method of controlling an LED driver can include: generating a sinusoidal half-wave signal having the same frequency and phase as an AC input voltage by utilizing a phase-locked loop; generating a sampling signal of a peak value of an inductor current in a power stage circuit of the LED driver; generating a loop compensation signal in accordance with the sinusoidal half wave signal and a signal representing an output current of the power stage circuit; and generating a switching control signal for controlling the power stage circuit in accordance with the sampling signal and the loop compensation signal.
Claims9
A method of controlling a light-emitting diode (LED) driver, the method comprising:
- a) generating a sinusoidal half-wave signal having the same frequency and phase as an alternating current (AC) input voltage by utilizing a phase-locked loop;
- b) generating a sampling signal of a peak value of an inductor current in a power stage circuit of said LED driver;
- c) generating a loop compensation signal in accordance with said sinusoidal half wave signal and a signal representing an output current of said power stage circuit;
- and
- d) generating a switching control signal for controlling said power stage circuit by comparing said sampling signal of said peak value of said inductor current against said loop compensation signal.
A control circuit for controlling a power stage circuit of a light-emitting diode (LED) driver, the control circuit comprising:
- a) a phase-locked loop configured to generate a sinusoidal half-wave signal having the same frequency and phase as an alternating current (AC) input voltage;
- b) a sampling circuit configured to generate a sampling signal of a peak value of an inductor current in said power stage circuit;
- c) a loop compensation circuit configured to generate a loop compensation signal in accordance with said sinusoidal half wave signal and a signal representing an output current of said power stage circuit;
- and
- d) a switching control signal generating circuit configured to generate a switching control signal for controlling said power stage circuit, by comparing via a first comparator, said sampling signal of said peak value of said inductor current against said loop compensation signal.
Dependencies are inferred from the claim text.