AbstractThis paper proposes a new power converter without any switching operation and which works as a linear amplifier. The main circuit of the proposed converter consists of series‐connected MOSFETs, series‐multi DC power supplies, and clamping diodes. The circuit configuration is similar to a diode‐clamped multi‐level inverter, except for using complementary power devices, which are n‐ and p‐channel MOSFETs. One of the series‐connected MOSFETs operates in an active state just like a linear amplifier, while the other MOSFETs operate in on or off states like an inverter circuit. As a result, the proposed converter achieves an acceptable efficiency as high as 90% without any ripples or harmonics caused by switching operation. Experimental results demonstrate that the proposed converter has the capability to drive a 2.2‐kW three‐phase induction motor. © 2008 Wiley Periodicals, Inc. Electron Comm Jpn, 91(6): 47–56, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecj.10120