Minimization of Output Voltage Ripple of Two-Phase Interleaved Buck Converter with Active Clamp

Abstract

A control technique combining pulse width modulation (PWM) and pulse amplitude modulation (PAM) is presented herein to reduce the output voltage ripple of the converter as little as possible. Such a converter requires a two-stage cascaded structure. The first stage is the buck-boost converter, which is used to adjust the output voltage of the second power stage, whereas the second stage is the two-phase interleaved buck converter, which is used to reduce the output voltage ripple. In theory, the two phases of the second stage operate under the condition of individual duty cycles of 50% with a phase difference of 180° between the two, and hence, the currents in the two phases are cancelled for any period of time, thereby making the output voltage of the converter almost voltage-free. Moreover, in order to improve the overall efficiency further, the proposed soft-switching technique based on an active clamp is presented and applied to these two stages to render the main and auxiliary switches turned on with zero-voltage switching (ZVS). Finally, the operating principles and control strategies of the proposed converter are described, and then, their effectiveness is verified by experimental results.

Control Scheme for a Quadratic-Based Step-Down On-Board DC/DC Converter to Be Used in Hybrid Electric Vehicles

“…In ref. [21], a two-stage IBC is proposed. A buck-boost converter is used for the first and the second stage is built up by a two-phase interleaved buck converter with an active clamp and uses soft-switching techniques.…”

Fractional Order PID Design for a Proton Exchange Membrane Fuel Cell System Using an Extended Grey Wolf Optimizer

“…Consequently, to ensure an efficient power conversion from the PEMFC to the external circuit, an adaptation element is required, and this can be done by inserting an electronic device between the power generator and the electrical load. This device is a static DC/DC converter equipped with an insulated gate bipolar transistor (IGBT) or metal oxide semiconductor field effect transistor (MOSFET) controlled by a command law [13]. This candidate connection is one of the most widely used power electronics circuits thanks to its high conversion efficiency and adjustable output voltage [14].…”

Development of Four-Channel Buck-Type LED Driver with Automatic Current Sharing

“…The LED current balance is mainly divided into active and passive. The active method [3][4][5][6][7] makes the load current evenly distributed among phases or modules strings. The work in [3] shows a dimming LED driver based on single-input multi-output (SIMO) buck DC-DC converter.…”

“…The study in [5] employs inner loop current sharing and average current processing to balance the current between two modules. The authors in [6] utilize inner current sharing plus a fixed duty cycle not only to balance the currents between the two phases but also to reduce the output ripple. The authors in [7] employ variable inductors to achieve current balance.…”

“…The authors in [7] employ variable inductors to achieve current balance. From the studies in [3][4][5][6][7], it can be seen that more current sensors and controllers are required, thereby making the corresponding circuit more complex and costly. Accordingly, the passive method is presented based on circuit features to achieve the current balance.…”