A Novel Control Scheme of DCM Boost PFC Converter

Abstract

The discontinuous current mode (DCM) boost power factor correction (PFC) converter features a zero-current turn-on for the switch, no reverse recovery in diode and constant frequency operations. However, when the duty cycle is constant in a line cycle, the input current contains rich 3 rd harmonic which has a phase difference of π with respect to the fundamental component. The harmonic results in not only a lower PF but also larger peak and RMS current values of the main power components, which lead to a higher conduction and switching turn-off loss. In this paper, a variable duty cycle control (VDC) scheme is proposed to make the input current contain only 3 rd harmonic which is in phase with fundamental component, while remaining the same PF at a certain input voltage as that of constant duty cycle control (CDC). A method of fitting the duty cycle is further proposed for simplifying the circuit implementation. The efficiency is improved as the critical inductance increases and the peak and RMS current values consequently decrease. The proposed method also achieves an output voltage ripple or the output storage capacitance reduction. The experimental results from a prototype of 120W are given to verify the effectiveness of the proposed method.Index Terms-Boost PFC, discontinuous current mode, 3 rd harmonic, efficiency.  Manuscript . His main research interests include power factor correction converters, renewable energy generation system and motor driving control.

DCM Boost PFC for High Brightness LED Driver Applications

“…Hence, the system is robust and easier to design. Furthermore, in comparison with recently reported work of [29,30], the proposed controller is simple to implement.…”

A Novel Single-Stage Tandem Soft-Switching Converter with Low Input Current Distortion

“…Furthermore, the boost PFC converters are used widely due the ease of design and their simple control [15]. According to the inductor current, the boost PFC converter is categorized into two major modes: continuous current mode and discontinuous current mode [16,17].…”

Design and implementation of PFC Cuk converter fed SRM drive

“…These PFC converters also produce the well regulated DC-link voltage to drive the motor. Many PFC-based buck, boost and buckboost converters are reported in the literature [2][3][4][5][6][7][8]. The buckboost converters are selected over buck and boost converters, as they can work in both buck and boost modes.…”

“…Depending upon the nature of the inductor current, these PFC converters can be designed to operate in three different modes of operation: discontinuous conduction mode (DCM), continuous conduction mode (CCM) and boundary between DCM and CCM, i.e. critical current mode [13][14][15][16][17]. Fig 1a shows the proposed Cuk converter-fed switched reluctance motor (SRM) drive, here an output inductor is designed for DCM of operation.…”