Triple-Phase-Shift Modulation Strategy for Diode-Clamped Full-Bridge Three-Level Isolated DC/DC Converter

Abstract

This work was supported by the ForsKEL and EUDP Project Voltage control and protection for a grid towards 100% power electronics and cable network (COPE) under Grant 64017-0047. ABSTRACT A triple-phase-shift (TPS) modulation strategy with reduced transformer's voltage stress is proposed in this paper for the diode-clamped full-bridge (FB) three-level isolated DC/DC converter. The proposed strategy can keep the transformer's maximum voltage changes (V) at only half of the input voltage (V in /2) by employing three phase-shift delays. Consequently, comparing with the conventional strategies, the merits of the proposed strategy include: 1) reducing the voltage change rate (dv/dt) on the transformer and 2) improving the transformer's voltage harmonics due to the merit of the multi-level voltage. Additionally, the proposed strategy has two operating modes with zero-voltage switching (ZVS) for fulfilling the wide input voltage range. Finally, the proposed strategy is verified by both simulation and experimental results. INDEX TERMS DC/DC converter, full-bridge three-level, phase-shift control, wide input voltage range, zero-voltage switching (ZVS).

Automatic Triple Phase-Shift Modulation for DAB Converter With Minimized Power Loss

“…Compared with SPS and DPS, TPS enjoys better modulation performance because it enjoys three degrees of freedom, which are the duty ratio of full bridge H 1 , the duty ratio of full bridge H 2 and the phase shift between them [10], [11]. TPS is worth investigation not only because it has wider zero voltage switching (ZVS) range and lower power loss [12], [13], but also because it is the general version for SPS and DPS.…”

“…However, three degrees of freedom of TPS result in severe difficulties in the analysis of power loss. In general, there are two different ways to analyze power loss: piecewise model [12], [14], [17]- [19] and harmonic analysis [11], [15], [20]- [22]. In the first method, waveforms are analyzed piece by piece based on different mode boundaries.…”

The dual active bridge converter design with artificial intelligence

“…In this modulation strategy, there will be three adjustable modulation parameters in total, outer phase shift Do, inner phase shift for the primary full bridge D1 and inner phase shift for the secondary full bridge D2. degrees of freedom, thereby having a wider ZVS range and higher efficiency [53], [54].…”

“…Compared with SPS and DPS, TPS enjoys better modulation performance because it has three degrees of freedom, which are the phase shift between two full bridges, the duty cycle of full bridge H1 and the duty cycle of full bridge H2 [147], [148]. TPS is worth investigation not only because it has wider zero voltage switching (ZVS) range and higher power efficiency [149], [150], but also because it is the general version for SPS and DPS.…”

“…However, three degrees of freedom of TPS result in severe difficulties in the analysis of power loss. In general, there are two different ways to analyze power loss: piecewise model [149], [151], [154]- [156] and harmonic analysis [157]- [161]. In the first method, waveforms are analyzed piece by piece based on different mode boundaries.…”