Circuit arrangement for modular drive power converters
First Claim
1. Device for bi-directional conversion of direct voltage of a direct voltage supply into a variable-frequency multi-phase voltage of a multi-phase voltage system with a power converter circuit comprising a plurality of identically designed sub-modules each being clocked with a clock frequency, which each comprise two terminals on the direct current side and two terminals on the alternating current side,where said sub-modules are connected in series by means of their terminals on the direct current side, so that the first terminal of the first sub-module and the second terminal of the last sub-module are connected to said direct current supply;
- where said terminals on the alternating current side of either one, or of a part of all sub-modules each form one of at least two phases of said multi-phase voltage system, andwhere said sub-modules are further designed such that the time course of said voltage at said terminals on the direct current side of each sub-module averaged over a few clock cycles can be controlled such that it is proportional to the power that is delivered to or received at said terminals on the alternating current side so that a storage capacitor of each sub-module must compensate only the comparatively low required energy between individual clock cycles of said clock frequency, and said voltages of said terminals on the direct current side of all sub-modules therefore add up to the voltage value of said direct voltage supply.
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Accused Products
Abstract
The invention relates to power converter circuits which are suitable, in particular, for mobile drive systems with stringent requirements in terms of weight minimization and availability as well as direct attachment to rotating field machines. Inter alia, the strictly modular design of the electronics and the very low expenditure on passive filter elements by virtue of the principle involved are characteristic.
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Citations
20 Claims
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1. Device for bi-directional conversion of direct voltage of a direct voltage supply into a variable-frequency multi-phase voltage of a multi-phase voltage system with a power converter circuit comprising a plurality of identically designed sub-modules each being clocked with a clock frequency, which each comprise two terminals on the direct current side and two terminals on the alternating current side,
where said sub-modules are connected in series by means of their terminals on the direct current side, so that the first terminal of the first sub-module and the second terminal of the last sub-module are connected to said direct current supply; -
where said terminals on the alternating current side of either one, or of a part of all sub-modules each form one of at least two phases of said multi-phase voltage system, and where said sub-modules are further designed such that the time course of said voltage at said terminals on the direct current side of each sub-module averaged over a few clock cycles can be controlled such that it is proportional to the power that is delivered to or received at said terminals on the alternating current side so that a storage capacitor of each sub-module must compensate only the comparatively low required energy between individual clock cycles of said clock frequency, and said voltages of said terminals on the direct current side of all sub-modules therefore add up to the voltage value of said direct voltage supply. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. Method for controlling a power converter circuit comprising a plurality of identically designed sub-modules being clocked with a clock frequency for bi-directional conversion of direct voltage of a direct voltage supply into a variable-frequency multi-phase voltage of a multi-phase voltage system, where said sub-modules, each comprising two terminals on the direct current side and two terminals on the alternating current side, are in their clocking and pulse width controlled such that
said terminals on the alternating current side of either one, or of a part of all sub-modules each form one of at least two phases of said multi-phase voltage system; -
the time course of said voltage at said terminals on the direct current side averaged over a few clock cycles is proportional to the power that is delivered to or received at said terminals on the alternating current side so that a storage capacitor of each sub-module must compensate only the comparatively low required energy between individual clock cycles; and the voltages of said terminals on the direct current side of all sub-modules add up to the voltage value of said direct voltage supply. - View Dependent Claims (18, 19, 20)
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Specification