Control system and control method for reducing total harmonic distortion
AssigneeSilergy Semiconductor Technology (Hangzhou) LTD
InventorsLongqi Wang, Jianxin Wang
Life of this patent
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Abstract
A method of reducing THD can include: acquiring a first average inductor current during a first conduction time of a main power transistor of a power converter in a switching cycle; acquiring a second average inductor current during a second conduction time and an off time of the main power transistor in the switching cycle; and adjusting the second conduction time of the main power transistor in accordance with a difference between the first and second average inductor currents, where the first and second conduction times are successive.
Claims14
A method of reducing total harmonic distortion (THD), the method comprising:
- a) acquiring a first average inductor current during a first conduction time of a main power transistor of a power converter in a switching cycle;
- b) acquiring a second average inductor current during a second conduction time and an off time of said main power transistor in said switching cycle;
- and
- c) adjusting said second conduction time of said main power transistor in accordance with a difference between said first and second average inductor currents, wherein said first and second conduction times are successive.
An apparatus for reducing total harmonic distortion (THD), comprising:
- a) a sampling circuit configured to acquire a first average inductor current during a first conduction time of a main power transistor of a power converter in a switching cycle, and to acquire a second average inductor current during a second conduction time and an off time of said main power transistor in said switching cycle;
- and
- b) a regulation circuit configured to adjust said second conduction time of said main power transistor based on a difference between said first and second average inductor currents, wherein said first and second conduction times are successive.
Dependencies are inferred from the claim text.