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Frequency converter voltage pulse shaping device and method

  • US 8,228,698 B2
  • Filed: 05/27/2008
  • Issued: 07/24/2012
  • Est. Priority Date: 06/20/2007
  • Status: Active Grant
First Claim
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1. A method for controlling the shape of the rising and falling edges of AC output voltage pulses of a PWM frequency converter by reducing a speed of change of, and a height of, the AC output voltage pulse, in which the PWM frequency converter is a network bridge for rectifying the alternating voltage of the supply network into a DC voltage (UDC) of a DC intermediate circuit, which is filtered with a filtering capacitor (CDC), a load bridge comprised of phase switches implemented with power semiconductor components, which forms an AC output voltage (U, V, W) from the DC voltage of the intermediate circuit for controlling the load (M),comprising setting an average speed of voltage change of the AC output voltage pulses of at least one power component by using one of said phase switch to control the at least one power component to be conductive and non-conductive in turn for a period of at least about one microsecond to change a pulse edge of the AC output voltage pulses into at least one micropulse, andwherein the width of the at least one micropulse is controlled to increase towards a final state of said phase switch.

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