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Power Conversion Technology: Lowering Power Loss Using Full Bridge Partial Resonance Circuits.
Devices installed in automobiles need to be compact and efficient, because the space for them is tight and the temperature is high. It is important to limit circuit loss, a cause of heating in power circuits, with fewer components. We propose a structure that combines switch elements with resonance circuits.
The main circuit uses the full bridge partial resonance method.
A difference from previous full bridge converters is that resonance effects emerge between switching elements' output capacitances, due to connecting an inductor serially with a transformer. By pulling out the charge between drain and source among the switching elements with the energy accumulated in the inductor, it becomes possible to lower element loss through zero voltage switching behavior.
【Features of Full Bridge Partial Resonance Circuits】
・ Able to lower the loss of the old full bridge converters just by adding inductors.
・ Power-on breadth is held constant, making it easy to use pulse transformers to construct drive circuits.
・ As the main switch elements have little switching loss, the SOA is wide.
・ Utilization of the transformer's leakage inductance enables reduction in number of components.
We are developing in-car power semiconductors independently. By developing
our own optimal power semiconductors, we are able to make designs fit for a variety
of systems and to increase the efficiency of power.
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