CIRCUIT AND METHOD FOR MULTIPHASE OPERATION OF AN ELECTRICAL MACHINE
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Accused Products
Abstract
A circuit and a method operate an electrical machine connected to at least three phases of a power supply network through a frequency converter that has a DC link. By a synchronous inverter that is actuated by a DC chopper and has two bridge halves switching the positive and the negative half-waves respectively, the energy generated by the machine is fed back into the power supply network. Accordingly, the synchronous inverter has an asymmetrical configuration such that, to switch the potential tapped from the DC link by the DC chopper, switching is carried out by a first bridge half that is formed from thyristors as electronic switches, and such that the second bridge half contains reverse-blocking electronic switches able to be switched off.
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Citations
22 Claims
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1-11. -11. (canceled)
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12. A circuit for operating an electrical machine, the circuit comprising:
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a frequency converter for connecting to at least three phases of a power supply network, said frequency converter having a DC intermediate circuit; a direct current (DC) chopper controller; and a synchronous inverter, energy generated by the electrical machine being fed back into the power supply network by means of said synchronous inverter being driven by said DC chopper controller, said synchronous inverter having two bridge halves for switching positive and negative half-waves respectively, said synchronous inverter being of an asymmetrical configuration such that, for switching a potential being tapped off from said DC intermediate circuit by said DC chopper controller, switching is performed by a first bridge half having thyristors as electronic switches, and a second bridge half having reverse-blocking electronic switches which can be switched off. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method for operating an electrical machine being connected to at least three phases of a power supply network via a frequency converter having a direct current (DC) intermediate circuit, which comprises the steps of:
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feeding back energy generated by the machine into the power supply network by means of a synchronous inverter being driven by a DC chopper controller; and switching a load current iL to a maximum and/or a minimum section of a network phase between phase transitions of the network phase and two closest network phases. - View Dependent Claims (19, 20, 21, 22)
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Specification