A Single-Phase PFC Rectifier With Wide Output Voltage and Low-Frequency Ripple Power Decoupling

Abstract

1-This paper proposes a single-phase PFC rectifier to achieve high power factor, wide output voltage range, and ripple power decoupling without using electrolytic capacitors. It consists of two parts: power factor correction (PFC) circuit and output voltage regulation circuit. The load side is involved in both parts, which is different from the regular two-stage conversion structure. The proposed rectifier can be directly applied to low voltage cases due to the wide output voltage range. And the decoupling capacitor voltage can be smaller than the peak grid voltage, which reduces the voltage stress. Besides, the low frequency ripple power buffer is implemented without a dedicated power-buffering controller. This paper firstly introduces the circuit structure, operation principles, and control method. Then, the system design consideration is given. Finally, the effectiveness of the proposed topology is verified by the simulations and experimental results. Index Terms-Active power decoupling, closed-loop control, low frequency ripple power, PFC, wide output voltage.

Active Power Decoupling Design of a Single-Phase AC–DC Converter

“…In Equation (15), ∆U max is the maximum value of the DC bus voltage ripple. Considering the reliability of the power supply and normal operation of the equipment, the DC bus voltage ripple should be within the prescribed range, generally not more than 10%.…”

“…Another factor is the limited lifetime of large electrolytic capacitors, which leads to reliability problems and increases maintenance costs [8][9][10]. To solve the above problems, some scholars put forward the active power decoupling method [11][12][13][14][15][16]. Active power decoupling circuits include switches and storage systems.…”

Single-Phase Inverter With Wide Input Voltage and Power Decoupling Capability

“…Many research efforts focus on the active power decoupling method [7]- [32]. It buffers the ripple power by swinging the decoupling capacitor voltage.…”

“…Recently, other functions (e.g., leakage current suppression in PV system and power factor correction (PFC)) have been merged into the decoupling circuits [24]- [32]. This type of decoupling circuits makes the most of the active and passive components.…”

“…In [29]- [31], the control of decoupling and PFC are coupled. By adding an extra switch, Liu et al [32] proposed a PFC rectifier, which releases the operation constraints and then makes the control easier to achieve.…”