Abstract
In this study, a new control strategy was proposed to improve transient response and the input current harmonic distortion of power factor correction (PFC) regulators operating in an average current mode. The proposed technique required only two additional gain selectors and a peak detector circuit on the feedforward voltage loop and output voltage feedback loops. It provided a direct reading for the average voltage value of feedback control loops and the peak voltage of feedforward control loops, producing PFC boost regulators with fast dynamic responses and low-input current harmonic distortion. The use of digital potentiometers for directly changing the gain of control loops did not require any divider or squarer to reduce the complexity of control circuits. The operating principles and control strategies of 300 W boost PFC with the new control strategy are presented with detailed analysis and discussion. The experimental results were satisfactory.
Highlights
Mainstream power supplies on the market are designed and developed using high-frequency switching technologies to achieve compactness and high performance
Two adjustable gain modulators are used to resolve the defects of poor conventional power factor correction (PFC) transient response
Relevant literature has revealed that, when boost PFC is operated with resistive load, the control-tooutput transfer function of the boost PFC is a one-order system
Summary
Mainstream power supplies on the market are designed and developed using high-frequency switching technologies to achieve compactness and high performance. Because the peak current control method is likely to be affected by noise [4] and requires slope compensation [5], the average current control method is extensively applied in switching power supply industries. The current control loop controls the phase difference between input current and voltages, whereas the voltage control loop regulates the direct current (DC) output voltage. Both control loops contain twice-line frequency ripples; the input currents generate second harmonic distortion. To reduce the second harmonic effect, the voltage and current loop bandwidth are limited. This design drags the system transient response. In applications for light-emitting diode drivers or adapters, fast dynamic responses must be considered because, when load currents change, the output voltage frequently generates oscillation
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