An electric drive system of an electrified vehicle has a power converter with phase leg switching devices controlled by pulse-width modulation to supply multi-phase AC to an electric traction motor. Dead-time intervals are inserted into gate drive signals for the switching devices without introducing any significant distortion in the output of the converter. A direction of current flow between a phase leg and the motor is detected. When the current direction is positive, lower gate signals for a lower switching device in the phase leg have a delayed rising edge and an advanced falling edge while upper gate signals are unmodified. When the current direction is negative, upper gate signals for an upper switching device in the phase leg have a delayed rising edge and an advanced falling edge while lower gate signals are unmodified.
Electric drive power converter with low distortion dead-time insertion
2018-05-01
Patent
Elektronische Ressource
Englisch
IPC: | H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen |
Electric Drive System and Method for Operating a Power Converter
Europäisches Patentamt | 2021
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