Medium frequency energy supply for rail vehicles
First Claim
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1. An electronic circuit for bidirectional conversion of a high input voltage to a direct-current output voltage with indirect coupling, comprising:
- a resonance circuit including a common transformer and a capacitor array, the common transformer including a plurality of primary windings and a single secondary winding;
a single secondary converter connected to the single secondary winding; and
a primary converter including at least three primary converter sections connected in series, output lines of each of the at least three primary converter sections being connected to a respective one of the plurality of primary windings of the common transformer, each primary winding of the common transformer being allocated one resonance capacitor, the resonance capacitors forming an oscillating circuit with a leakage inductance coil of the common transformer,wherein the capacitor array includes a symmetrical magnetic and electric structure for lossless switching operation, and wherein the transformer, the capacitor array, and a respective resonance frequency and switching frequency are selected such that each of the primary converter sections are decoupled, and wherein for a resonance frequency, a ratio of impedances of the leakage inductance coil to the capacitor array is chosen so that an effective value of an alternating voltage of at least one of the capacitors in nominal operation is at least ⅓
of a no-load voltage of a transformer of a primary winding.
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Abstract
Disclosed is an electronic circuit for the bidirectional conversion of a high input voltage to a direct-current output voltage with indirect coupling, more specifically such a circuit for use in a power supply system for rail vehicles, that is provided with a primary converter, one single common transformer and a secondary converter. The primary converter includes at least three primary converter sections connected in series, the output lines of which are each connected to a respective one of the transformer primary windings.
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Citations
18 Claims
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1. An electronic circuit for bidirectional conversion of a high input voltage to a direct-current output voltage with indirect coupling, comprising:
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a resonance circuit including a common transformer and a capacitor array, the common transformer including a plurality of primary windings and a single secondary winding; a single secondary converter connected to the single secondary winding; and a primary converter including at least three primary converter sections connected in series, output lines of each of the at least three primary converter sections being connected to a respective one of the plurality of primary windings of the common transformer, each primary winding of the common transformer being allocated one resonance capacitor, the resonance capacitors forming an oscillating circuit with a leakage inductance coil of the common transformer, wherein the capacitor array includes a symmetrical magnetic and electric structure for lossless switching operation, and wherein the transformer, the capacitor array, and a respective resonance frequency and switching frequency are selected such that each of the primary converter sections are decoupled, and wherein for a resonance frequency, a ratio of impedances of the leakage inductance coil to the capacitor array is chosen so that an effective value of an alternating voltage of at least one of the capacitors in nominal operation is at least ⅓
of a no-load voltage of a transformer of a primary winding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An electronic circuit for bidirectional conversion of a high input voltage to a direct-current output voltage with indirect coupling, comprising:
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a resonance circuit including a common transformer and a capacitor array, the common transformer including a plurality of primary windings and a single secondary winding; a single secondary converter connected to the single secondary winding; and a primary converter including at least three primary converter sections connected in series, output lines of each of the at least three primary converter sections being connected to a respective one of the plurality of primary windings of the common transformer, each primary winding of the common transformer being allocated one resonance capacitor, the resonance capacitors forming an oscillating circuit with a leakage inductance coil of the common transformer, wherein the capacitor array includes a symmetrical magnetic and electric structure for lossless switching operation, wherein the transformer, the capacitor array, and a respective resonance frequency and switching frequency are selected such that each of the primary converter sections are decoupled, and wherein mutual coupling of the transformer primary windings and respective coupling to the single secondary winding is a symmetrical magnetic coupling achieved in that the respective transformer primary windings have the same magnetic design and are arranged in the shape of discs between two of a plurality of secondary part windings of the single secondary winding that are connected in parallel or in series and that are linked to a secondary converter system, provided with a direct-current output voltage intermediate circuit.
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18. An electronic circuit for bidirectional conversion of a high input voltage to a direct-current output voltage with indirect coupling, comprising:
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a resonance circuit including a common transformer and a capacitor array, the common transformer including a plurality of primary windings and a single secondary winding; a single secondary converter connected to the single secondary winding; and a primary converter including at least three primary converter sections connected in series, output lines of each of the at least three primary converter sections being connected to a respective one of the plurality of primary windings of the common transformer, each primary winding of the common transformer being allocated one resonance capacitor, the resonance capacitors forming an oscillating circuit with a leakage inductance coil of the common transformer, wherein the capacitor array includes a symmetrical magnetic and electric structure for lossless switching operation, wherein the transformer, the capacitor array, and a respective resonance frequency and switching frequency are selected such that each of the primary converter sections are decoupled, wherein control of the electronic circuit is devised in such a manner that residual asymmetries of the resonance circuit are compensated by a control which is performed by way of a mains four-quadrant regulator, and, wherein a superimposed intermediate circuit voltage control is realized by the four-quadrant regulator of the respective one of the primary converter sections, the intermediate circuit voltage control compensating a static residual asymmetry of the resonance circuit so that the intermediate circuit voltages of the primary converter sections can differ.
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Specification