ZVT‐PWM DC–DC boost converter with active snubber cell

Abstract

In this study, a novel zero voltage transition pulse width modulation (ZVT-PWM) DC-DC boost converter with an active snubber cell is proposed. All of the semiconductor devices in the converter turn on and off with soft switching (SS). The main feature of the proposed converter is the absence of extra current or voltage stress on the main switch and main diode. There is also no extra voltage stress on the auxiliary switch and the auxiliary diodes. The main switch turns on with ZVT and turns off with zero voltage switching. The auxiliary switch turns on with zero current switching and turns off with zero current transition. The proposed converter smoothly operates under light-load conditions. Having a simple structure at low cost is the main advantage of the proposed converter. This study also realises the theoretical analysis of the proposed converter. The experimental results, the operating stages and the key waveforms of the proposed converter, are given in detail for 500 W and 100 kHz switching frequency. Moreover, it is shown that the overall efficiency reaches a value of 97.8% at nominal output power. The proposed SS topology can be used in applications with the battery power source and low-voltage DC-link.

A New Active Snubber Cell for Soft Switched Power Factor Correction Boost Converters

“…This case leads to the additional conduction losses. In [20], [21], SS strictly depends on duty cycle and SS cannot be achieved under 0.5 duty cycle and an additional current stress is exposed across the 4 main switch in [21].…”

Design and application of a novel snubber cell for soft switched pwm dc–dc converters

“…Although the main switch is turned on under ZVT and the main diode is turned off under zero current switching (ZCS), the auxiliary switch is turned off under HS in the conventional ZVT converter [5]. To overcome the issue of conventional ZVT converter, a lot of snubber cells are introduced in the literature [6][7][8][9][10][11][12][13][14].…”

“…In [6][7][8], all semiconductor devices are turned on and off under SS but there is an extra voltage stress on the auxiliary switch. In [9,10], there is an extra voltage stress on the auxiliary diode. In [11], the oscillation between parasitic capacitance of the main switch and snubber inductance causes to EMI when the main switch is turned off.…”

Half‐bridge flyback converter with lossless passive snubber and interleaved technique

“…To reduce the size of the flyback converter, the switching frequency can be increased but it increases the switching losses and lowers the efficiency [6]. To solve these problems and to improve converter's efficiency [7,8], active [9][10][11][12] and passive [13][14][15][16][17] soft-switching techniques have been introduced to provide zerovoltage (ZV) and zero-current (ZC) switching conditions. Active soft-switching techniques employ an additional switch to provide soft-switching condition leading to more circuit cost and complexity.…”