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US 2017/0250620 A1Published application
Average current modulator for an led driver
AssigneeQueen's University at Kingston
InventorsBRIAN J.R. WHITE, YAN-FEI LIU
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AssigneeQueen's University at Kingston
InventorsBRIAN J.R. WHITE, YAN-FEI LIU
Estimating the term…
The invention relates to circuits and methods that that reduce or eliminate the second harmonic ripple in the output of a single stage AC-DC converter, while minimizing the required output capacitance. The circuits and methods include an average current modulator having a switch connected in series with the DC load, and strategies for sampling the load current and controlling a duty cycle of the switch by comparing the sampled current to a current control signal so that the average load current is maintained at a selected current, and the second harmonic ripple component of the load current is reduced or eliminated. The circuits and methods substantially improve the performance and reliability of single stage AC-DC converters. The circuits and methods are particularly useful in applications were low ripple and high reliability are desirable, such as in driving LED loads in lighting applications.
An AC-DC converter, comprising:
A method for reducing or eliminating a low-frequency AC ripple component of a load current of a single-stage PFC AC-DC converter, comprising:
A circuit for use with an AC-DC converter, comprising:
Dependencies are inferred from the claim text.