Direct Current Control Method Based On One Cycle Controller for Double-Frequency Buck Converters

Abstract

In this paper, a direct current control method based on a one-cycle controller (DCOCC) for double frequency buck converters (DF buck) is proposed. This control method can make the average current through the high frequency and low frequency inductors of a DF buck converter equal. This is similar to the average current control method. However, the design of the loop compensator is much easier when compared with the average current control. Since the average current though the high frequency and low frequency inductors is equivalent, the current stress of the high frequency switches and the switch losses are minimized. Therefore, the efficiency of the DF buck converter is improved. Firstly, the operation principle of DCOCC is described, then the small signal models of a one cycle controller and a DF buck converter are presented based on the state space average method. Eventually, a system block diagram of the DCOCC controlled DF buck is established and the compensator is designed. Finally, simulation and experiment results are given to verify the correction of the theory analysis.

Average and Small Signal Modeling of Negative-Output KY Boost Converter in CCM Operation

“…In recent years, exploring new topologies of DC-DC converters has attracted much attention of many researchers since it plays an important role in DC-DC switching power supplies to improve their performance, and different kinds of DC-DC converters have been proposed [1][2][3][4][5][6][7][8][9], such as Buck converter [1,2], Boost converter [3], Buck-Boost converter [3], Cuk converter [3], Sepic converter [4], Luo converter [5], Superbuck converter [6], and single-inductor-multipleoutput converter [7,8]. Among them, a good topology of DC-DC converter, named negative-output KY Boost converter, has been proposed by Hwu et al in 2009 [9].…”

Modeling and Analysis of the Fractional Order Buck Converter in DCM Operation by using Fractional Calculus and the Circuit-Averaging Technique

“…The averaged method includes the state space averaged method [2] and circuit-averaging technique [3]. The averaged method is popular in the field of DC-DC converters because this method can be used in the complex frequency domain [4], [5]. However, all of the above results are obtained under the condition that the real inductor and capacitor in the DC-DC converter are considered integer order and are described by integer calculus.…”

Development of Robust Discrete controller for Double Frequency Buck converter

“…It is considered that the discrete system is same as that of the continuous system except that the system is sampled with a sampling time, which is assumed as 1 µS. The state space solution (40) is evaluated and finds an analog PID controller equation using Ziegler -Nichols method [2]. Figure 6 shows the closed loop control system of the DF buck converter with Discrete PID -based feedback.…”