Single module tests
Generally waveforms indicate good resonant switching with no shoot-through currents in the full range of the line input voltages, and fair agreement with PSpice simulations. In this and the following figures, the inset notes indicate test conditions, types of the probes used, vertical and horizontal resolutions, etc. The primary winding was divided into two sections connected in parallel, each commutated by a transistor set, hence the notation “halved” in this and the following figure captions.
The dashed line indicates the start of the FWD conduction. At low line, the FWDs do not conduct at all. These measurements were performed with the Powerex IGBTs CM300DC-24NFM. The power losses were assessed at 50 W per transistor, and the heat was easily evacuated using air-cooled heat sinks with an overheat of less than 40◦ C above ambient under the harshest conditions. The methods of power loss measurement and calculation are detailed in. Special attention is paid to the determination of the losses multiplier and HV transformer. This was a key to the design of the HV tank. With this purpose, the calorimetric measurements of the losses of the converter module HV components were performed. The converter efficiency was estimated at 97.5 percent; thus, an overall efficiency of 95 percent of the whole dc HV power supplies was projected. In view of the expected high efficiency, it was decided to adopt an all-air-cooling scheme without any heat exchangers.
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