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Phase shift type inverter circuit, X-ray high voltage apparatus, X-ray CT apparatus, and X-ray imaging apparatus using the same
Phase shift type inverter circuit, X-ray high voltage apparatus, X-ray CT apparatus, and X-ray imaging apparatus using the same
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机译:相移型逆变器电路,X射线高压设备,X射线CT设备以及使用该电路的X射线成像设备
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摘要
An inverter circuit allowing a single drive circuit to perform both tracking control for tracking resonance frequency fluctuations caused by load fluctuations, and power control, thereby reducing switching loss. An inverter drive circuit part obtains a phase difference between output current and output voltage directed to a load circuit connected to a midpoint of two arm circuits of the inverter circuit, and controls a phase of the driving signal directed to each semiconductor switch such that the phase difference becomes zero or a predetermined value, enabling an operating frequency of the inverter circuit part to track a resonance frequency of the load circuit, and enabling a current phase to be delayed with respect to a voltage phase, thereby achieving ZCS. Since the phase difference is used, an auxiliary circuit is not necessary for measuring a current value in proximity to the semiconductor switches.
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