Abstract
Due to the input power and output power do not match in real time, single-stage power factor correction converters have large double-line-frequency ripple at the output voltage. The double-line-frequency ripple voltage will cause some electronic devices to work abnormally, and limit the control loop bandwidth of power factor correction converter. In order to reduce the output double-line-frequency ripple voltage, a single-stage Flyback power factor correction converter with Buck ripple suppressor is used in this paper, the Buck ripple suppressor can generate same magnitude but 180° phase shifted voltage as Flyback power factor correction converter output voltage ripple. Adaptive on-time control is adopted in the Buck ripple suppressor benefiting with its wider bandwidth and fast dynamic response. The switching frequency range and stability of Buck ripple suppressor under constant on-time control and adaptive on-time control are discussed. By establishing the input-output audio susceptibility model, the output double-line-frequency ripple suppression performance is analyzed. Buck ripple suppressor using adaptive on-time control can suppress double-line-frequency ripple voltage effectively with the fast dynamic response and high efficiency. Simulation and experimental results are given to verify the theoretical analysis.
Highlights
Single stage power factor correction (PFC) converter suffers from serious double-line-frequency (DLF) ripple voltage due to the difference between the instantaneous variable AC input power and the constant DC output power [1], [2]
The control loop bandwidth of the PFC converter is generally set at about 10-20 Hz [3], which seriously affects the load dynamic response
The most direct way to reduce the DLF ripple of the PFC converter output voltage is to use a large capacity electrolytic capacitor
Summary
Single stage power factor correction (PFC) converter suffers from serious double-line-frequency (DLF) ripple voltage due to the difference between the instantaneous variable AC input power and the constant DC output power [1], [2]. The paper proposes AOT control method for quasi-single-stage (QSS) Flyback PFC converter to obtain fast dynamic response and low output voltage ripple. Comparing to exiting control methods, the proposed AOT-controlled QSS has the following advantages: 1) achieves very fast load dynamic response and high efficiency; 2) simple control without compensation network; 3) lower output voltage ripple and friendly to EMI design. The COT-controlled Buck RS is proved to be effective in the output voltage DLF ripple suppression and improvement of dynamic response [23]. AOT control is applied to control Buck RS, it has the similar wide bandwidth as well as COT control and can further suppress output voltage DLF ripple effectively, and narrower variation of switching frequency can be achieved
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