Abstract
To extend the operating range of the snubber assisted zero-voltage and zero-current transition dual-interleaved boost converter beyond its inherent soft-switching limit of D = 0.5, a resonant pulse transformer is proposed instead of the resonant inductor. The 1 : 2 turns ratio of the transformer ensures full discharge of the snubber capacitor at all duty ratio values to facilitate zero-voltage zero-current switching at turn on of the main switching devices. The effectiveness of the topology has been confirmed by SPICE simulation and demonstrated by a 20 kW SiC metal–oxide–semiconductor field-effect transistor converter. The prototype operated at 20 kW, 112 kHz, 320–600 V achieving 98.7% efficiency and achieved 98.2% efficiency at 6 kW. Taking the additional losses in the auxiliary circuit into account, the switching losses at 20 kW are reduced by 74% compared with hard-switching operation, representing a 54% reduction in overall losses.
Highlights
To achieve high power-density in multi-kW DC-DC converters, wide band gap devices such as SiCMOSFETs are being considered
The zero-voltage zerocurrent switching (ZVZCS) turn on can be achieved for a wide range of duty ratios
The resonant inductor of the SAZZ-DIBC topology was replaced by a pulse transformer of the same size and weight
Summary
To achieve high power-density in multi-kW DC-DC converters, wide band gap devices such as SiC. The converter had a modest efficiency of 84% at the rated condition of 2.4 kW due to the two-stage conversion Another modified SRC topology was proposed in [8] using more than twice the number of devices in a conventional full bridge SRC to reduce the size and loss in the isolation transformer. Apart from the additional transistors, this solution requires complex switching control and may result in increased conduction losses compared to hard-switching due to the extended conduction of the additional transistors Another approach is to use the reverse recovery of the upper diode to develop sufficient current in the resonant inductor [15]. The experimental results show the superiority of the proposed topology over the previously published SAZZ circuits as zero-voltage-zerocurrent-switching turn on can be achieved for the full range of duty ratios without additional control complexity. The loss breakdown of the converter confirms the superiority of soft-switching over hard-switching operation
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