Rotron, Inc.

Todd J Kazmirski

Ralph Prete

Vladimir Brunstein

Due to the intermittent nature of electrical connection through moving contacts on electrically propelled vehicles, electrical power converters such as power supplies and inverters are subject to large voltage transients. For compactness and low weight, a high-frequency power converter comprised series-connected high-speed switching circuits, so that an input voltage with voltage transients is split between the switching circuits. As a result, lower-rated switching elements such as IGBT's and MOSFET's can be used while maintaining resistance to input-voltage transients.

Electrical power converter, power supply, and inverter with

A voltage surge sensing and control circuit is coupled to the dc power supply inputs of the electronic commutator. This circuit acts to sense the input voltage which is to be applied across the ECDC motor windings. When the input voltage is determined to be high enough to generate commutation energy sufficient to damage a power transistor, if applied to it singularly, the voltage surge control circuit acts to distribute the excess energy over a number of power transistors in the commutation circuit, thereby, protecting the power transistors from excess voltage applied through the system by distributing the excess energy over a number of conducting power transistors simultaneously. The present invention also minimizes commutation energy across the transistors by using bonded bifilar wiring and phase decoupling capacitors. The bonded bifilar wiring acts to minimize the inductance field, whereas the phase decoupling capacitors act to absorb energy generated after the winding phases are deenergized.

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Port Ewen, NY, United States of America

Todd J Kazmirski