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AssigneesHitachi Medical Corporation, Institute of National College of Technology, National University Cooperation Nagaoka University of Technology
InventorsMina Ogawa, Itaru Ando, Kiyoshi Ohishi, Shoutaro Shindo
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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.
A phase shift inverter circuit comprising:
A phase shift inverter circuit comprising:
A phase shift inverter circuit comprising:
Dependencies are inferred from the claim text.