Patent
On-time control for constant current mode in a flyback power supply
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TLDR
In this article, a primary side sensing power control system and method for constant current control that utilizes a relationship that involves the measured reset-time from the previous cycle to determine the primary side peak current and off-time for the next cycle.Abstract:
A primary side sensing power control system and method for constant current control that utilizes a relationship that involves the measured reset-time from the previous cycle to determine the primary side peak current and off-time for the next cycle. This control mechanism does not need the knowledge of input voltage or magnetizing inductance. Therefore, it removes the sensitivities of input voltage and magnetizing inductance to the output current limit. Furthermore, it uses a time measurement instead of a voltage measurement for the current calculation which in many cases is easier to perform.read more
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References
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Patent
Switching control circuit having off-time modulation to improve efficiency of primary-side controlled power supply
TL;DR: In this paper, a voltage-waveform detector produces a voltage feedback signal and a discharge-time signal by multi-sampling a voltage signal of a transformer, and the discharge time represents a discharge time of a secondary-side switching current.
Patent
Constant current mode ripple attenuation method in flyback power supply
John W. Kesterson,Junjie Zheng +1 more
TL;DR: A modification of a control loop of a primary side sensing power control system that uses a different and unique relationship to accomplish the constant current control while attenuating the affects of a ripple voltage is described in this paper.
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