Modular power supply design

OData support
Dr. Balogh Attila
Department of Automation and Applied Informatics

In our days the mainstream developments in power-electronics are focused on electrical driving solutions. Most vehicle and airplane manufacturers place a heavy emphasis on investments in researches related to these systems. This fact entails both the technical progress of accumulators and battery cells - since those are the primary energy sources of electrical drives - and the developement of various instruments and test equipment by the supportive electronical industries, providing a secure and cost-effective testing.

Since vehicle driving systems are safe-critical, electronical parts has to be validated and verificated carefully. These parts are tipically power modules like voltage converters and their control electronics. Preventing a system or subsystem from an irreversible damage due to an error is an essential requirement of advanced testing today. Hence the hazardous components of the system are usually emulated either by hardware or software. The modell of the converters or any power modules, so as the battery system itself, can be realized in a HIL (Hardware-In-the-Loop) simulator. The sinking behaviour of a battery cell can be achieved by a multi-quadrant laboratory power supply.

This MSc thesis work is part of a project handled in collaboration with two other MSc graduate students. The end goal of the project is to produce a bidirectional two-quadrant isolated modular laboratory power supply with HIL development support. The main scope of this paper is the design of the power unit module (PU) which consist of the realization of a bidirectional galvanically isolated full-bridge DC/DC converter as the main circuit and its interface board. The thesis also introduces the operation princple of the converter and gives the embedded code implementation of the control algorithm. The design is proposing a solution both for cooling and constructional issues made to international standards, selects components for the main circuit so as for the isolated current and voltage sensing circuits and power semiconductor drivers.


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