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Electronic control transformer using DC link voltage

  • US 20070151272A1
  • Filed: 01/03/2006
  • Published: 07/05/2007
  • Est. Priority Date: 01/03/2006
  • Status: Abandoned Application
First Claim
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1. A drive system to power a plurality of components of a chiller system having different voltage requirements, the drive system comprising:

  • a converter stage connected to an AC power source to receive an input AC power at a fixed input AC voltage and a fixed input frequency, the converter stage being configured to convert the fixed input AC voltage to a boosted DC voltage, the boosted DC voltage being greater than the fixed input AC voltage;

    a DC link connected to the converter stage, the DC link being configured to filter the boosted DC voltage and store energy from the converter stage; and

    a first inverter stage connected to the DC link, the first inverter stage being configured to convert the boosted DC voltage from the DC link to provide an output power at a variable voltage and variable frequency to a motor of a chiller system, the variable voltage having a maximum voltage greater in magnitude than the fixed input AC voltage and the variable frequency having a maximum frequency greater than the fixed input frequency;

    wherein the first inverter stage is configured to reverse power flow through the first inverter stage to the DC link stage to transfer electrical power from energy stored in a rotating mass of a motor connected to the first inverter stage to maintain a voltage level of the DC link in response to a decreasing fixed input AC voltage; and

    a second inverter stage connected to the DC link, the second inverter stage being configured to convert the boosted DC voltage from the DC link into an auxiliary output power source having a fixed output AC voltage and a fixed output frequency for at least one component of a chiller system, the fixed output AC voltage being less than the fixed input AC voltage; and

    , wherein the fixed output AC voltage and fixed output frequency of the second inverter stage is maintained in the event of a temporary decrease in the fixed input AC voltage.

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