研究目的
To develop a high-voltage supply for medical X-ray systems that provides fast output voltage control with short rise and fall times, low inverter RMS current, and zero voltage or current switching over a full operating range with constant switching frequency.
研究成果
The CISABC provides lower inverter RMS current, higher maximum output current, and ZVS or ZCS over the full operating range with constant switching frequency compared to ISABC and SRC. It enables fast output voltage control with rise times as low as 100 μs, making it suitable for high-voltage X-ray supplies.
研究不足
The circuit requires two transformers or a transformer with two flux paths, increasing complexity. It exhibits slightly higher RMS currents on the rectifier side in some operating ranges. The study uses a low-voltage equivalent prototype, not actual high-voltage equipment.
1：Experimental Design and Method Selection:
The study proposes a coupled interleaved single active bridge converter (CISABC) derived from the uncoupled interleaved single active bridge converter (ISABC). Steady-state operation is analyzed, and a prototype is built and tested.
2：Sample Selection and Data Sources:
A 60 kW low-voltage equivalent prototype is used, with transformers designed to mimic high-voltage conditions.
3：List of Experimental Equipment and Materials:
Includes inverters with 650 V IGBTs, transformers with N87 ferrite cores, rectifiers with Si diodes, a capacitor bank, load resistors, and measurement instruments.
4：Experimental Procedures and Operational Workflow:
The prototype is operated at 50 kHz switching frequency; steady-state waveforms and step responses are measured; output voltage control is implemented using an FPGA.
5：Data Analysis Methods:
Waveforms are analyzed to verify conduction modes; output current-duty cycle relationships are derived analytically; simulations compare with experimental results.
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