MULTI-PULSE CONSTANT VOLTAGE TRANSFORMER FOR A VARIABLE SPEED DRIVE IN CHILLER APPLICATIONS
First Claim
1. A variable speed drive system, comprising:
- a multiple pulse transformer connected to a three-phase AC power source configured to provide an input AC voltage;
a converter configured to convert the input AC voltage to a DC voltage;
a DC link connected to the converter, wherein the DC link is configured to filter and store the DC voltage from the converter; and
an inverter connected to the DC link, wherein the inverter is configured to convert the DC voltage from the DC link into output AC power having a variable voltage and a variable frequency;
wherein the multiple pulse transformer comprises;
three primary windings, each of the primary windings connected to a phase of the three-phase AC power source, each of the primary windings comprising a plurality of input terminals, wherein a first input terminal of the plurality of input terminals is wound for a first utility voltage available at the three-phase AC power source and a second input terminal of the plurality of input terminals is wound for a second utility voltage available at the three-phase AC power source, and wherein the first utility voltage is different than the second utility voltage; and
a plurality of secondary windings, each secondary winding comprising three phase windings, respectively.
2 Assignments
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Accused Products
Abstract
A multi-pulse transformer with multiple taps provides a constant magnitude voltage output to a variable speed chiller'"'"'s compressor motor over a range of input voltages. The 3-phase transformer includes primary windings and a plurality of secondary windings. The secondary windings are electromagnetically coupled with the associated primary winding. The primary windings include taps for receiving multiple input AC voltages and the secondary windings have a single output terminal for supplying a predetermined output voltage which, after rectification produces a DC multi-pulse waveform for powering a DC link of a variable speed drive. Alternatively the 3-phase transformer includes multiple taps on the secondary windings. Each of the primary windings has a terminal for receiving an input AC voltage. The taps of the secondary windings provide an output voltage that is converted to a multi-pulse waveform for powering a DC link of a variable speed drive.
0 Citations
20 Claims
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1. A variable speed drive system, comprising:
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a multiple pulse transformer connected to a three-phase AC power source configured to provide an input AC voltage; a converter configured to convert the input AC voltage to a DC voltage; a DC link connected to the converter, wherein the DC link is configured to filter and store the DC voltage from the converter; and an inverter connected to the DC link, wherein the inverter is configured to convert the DC voltage from the DC link into output AC power having a variable voltage and a variable frequency; wherein the multiple pulse transformer comprises; three primary windings, each of the primary windings connected to a phase of the three-phase AC power source, each of the primary windings comprising a plurality of input terminals, wherein a first input terminal of the plurality of input terminals is wound for a first utility voltage available at the three-phase AC power source and a second input terminal of the plurality of input terminals is wound for a second utility voltage available at the three-phase AC power source, and wherein the first utility voltage is different than the second utility voltage; and a plurality of secondary windings, each secondary winding comprising three phase windings, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A variable speed drive system, comprising:
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a multiple pulse transformer connected to a three-phase AC power source configured to provide input AC voltage; a converter configured to convert the input AC voltage to a DC voltage; a DC link connected to the converter, wherein the DC link is configured to filter and store the DC voltage from the converter; an inverter connected to the DC link, wherein the inverter is configured to convert the DC voltage from the DC link into output AC power having a variable voltage and a variable frequency; and a control panel configured to output a control signal to the variable speed drive system to adjust the output AC power based on feedback indicative of a condition of a vapor compression system; wherein the multiple pulse transformer comprises; three primary windings, each of the primary windings connected to a phase of the three-phase AC power source, each of the primary windings comprising a plurality of input terminals for connection to the three-phase AC power source, wherein a first input terminal of the plurality of input terminals is wound for a first utility voltage available at the three-phase AC power source, and a second input terminal of the plurality of input terminals is wound for a second utility voltage available at the three-phase AC power source, and wherein the first utility voltage is different than the second utility voltage; and a plurality of secondary phase windings, each secondary phase winding having multiple voltage output terminals. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A chiller system, comprising:
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a refrigerant circuit comprising compressor, a condenser, and an evaporator connected in a closed refrigerant loop; and a multiple pulse transformer comprising three primary windings connected to a three-phase AC power source and a plurality of secondary windings connected to a variable speed drive to power a motor of the compressor, wherein each of the primary windings comprises a plurality of input terminals for connection to the three-phase AC power source, wherein a first input terminal of the plurality of input terminals is wound for a first utility voltage available at the three-phase AC power source, and a second input terminal of the plurality of input terminals is wound for a second utility voltage available at the three-phase AC power source, and wherein the first utility voltage is different than the second utility voltage. - View Dependent Claims (19, 20)
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Specification