New Shoot-Through Control Methods for qZSI-Based DC/DC Converters

Abstract

Shoot-through control methods for qZSI-based dc/dc converters are presented and studied. The major goal was to increase efficiency. A new modulation technique, pulse width modulation (PWM) with shifted shoot-through, is compared with the conventional PWM shoot-through control method. The new method reduces switching frequency of bottom side transistors and inherently features partial soft switching. Previous studies have shown that the biggest drawback of PWM control with shoot-through is unequal switching frequencies of transistors. One solution to that problem could be signal swapping that has been proposed by the authors of this paper. All control methods are first simulated and then experimentally verified on a test prototype.

Multi-mode quasi-Z-source series resonant DC/DC converter for wide input voltage range applications

“…Similar to the baseline qZSC topology, the qZSSRC has two main operating modes: normal (or non-shoot-through) and boost (or shoot-through) mode [24]- [27]. The resulting advantage of the qZSSRC over the qZSC is soft-switching operation.…”

“…If the input voltage drops below the nominal level, the converter starts to operate in the boost mode similarly to the traditional qZSC and the output voltage is controlled by the variation of the shoot-through duty cycle D ST [27]. The switching frequency of the inverter switches f SW in the boost mode remains fixed to the resonant frequency f r .…”

Analysis of advanced inverter topology for renewable energy generation and energy storage integration into AC grid

“…The calculation of the parameters of passive components of the quasi Z-source inverter without energy storage is analyzed in many papers, for example, in [15][16][17][18]. The difference from traditional qZSI in parameter calculation is that voltage ripple on the capacitors must be lower to limit battery power pulsations, it means that passive component values must be higher that in traditional qZSI.…”

Control of quasi-Z-source dc-dc converter by the overlap of active states: New possibilities and limitations

“…This method allows achieving soft switching without additional components, which increases efficiency of the converter. Several new PWM control methods such as shifted shoot-through control and swapped PWM control have been proposed recently, which allow to improve the performance even more [5].…”