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DC BUS CLAMP CIRCUIT TO PREVENT OVER VOLTAGE FAILURE OF ADJUSTABLE SPEED DRIVES

  • US 20100177452A1
  • Filed: 01/15/2009
  • Published: 07/15/2010
  • Est. Priority Date: 01/15/2009
  • Status: Active Grant
First Claim
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1. In a power supply having a DC bus providing a DC voltage across a positive and negative bus rail to one or more inverters which provide power to windings of one or more electric motors, the DC bus having at least one capacitive element connected across the positive and negative bus rails, an apparatus for reducing electrical transients on the DC bus comprising:

  • at least one damping element having a resistor and a damping capacitor connected in parallel with the resistor; and

    a first and a second diode each connected in series with the at least one damping element between the common point and the positive and negative bus rails respectively, such that the direction of conductance of the first diode is from the common point to the positive rail and the direction of conductance of the second diode is from the negative rail to the common point.

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