Abstract
In this paper, a feedback compensator (FBC) and a Feedforward compensator (FFC) are proposed to construct a novel compensated peak current mode control pulse width modulation (CPC-PWM) for primary-side controlled flyback converters. Using the proposed FBC, the PWM duty cycle of an abnormal operating flyback converter would be descended to limit the output current for reducing power dissipation. Using the proposed FFC, the effect of delay time would be descended to reduce the over-flow current for increasing the current accuracy. In this paper, the operating principle and mathematical model are described and analyzed. Then, the component values are well designed to satisfy the electrical specifications. Finally, a prototype is designed and realized to access system performance. The experimental results show that the proposed CPC-PWM can validate in a wide input voltage range and output short conditions, which also has good current accuracy and reduces power dissipation by about 68%.
Highlights
IntroductionBecause the flyback converter has a simple structure and does not require a secondary side output inductor, it has considerable advantages in size and cost
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Since the flyback converter is an isolated converter, the output voltage and current are traditionally regulated by utilizing the secondary-side regulation (SSR)
Summary
Because the flyback converter has a simple structure and does not require a secondary side output inductor, it has considerable advantages in size and cost. With the advancement of digital technology and the cost of microcontrollers has dropped significantly. Since the flyback converter is an isolated converter, the output voltage and current are traditionally regulated by utilizing the secondary-side regulation (SSR). The photocoupler feedback circuit causes above 10% of the power losses at standby conditions. Primaryside regulation (PSR) flyback converter (i.e., primary-side controlled flyback converter) becomes an important technology due to lower cost and standby power losses [1,17,18,19,20,21,22,23,24,25]
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