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METHOD AND APPARATUS FOR BYPASSING CASCADED H-BRIDGE (CHB) POWER CELLS AND POWER SUB CELL FOR MULTILEVEL INVERTER

  • US 20180145578A1
  • Filed: 01/22/2018
  • Published: 05/24/2018
  • Est. Priority Date: 08/13/2012
  • Status: Active Grant
First Claim
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1. A power conversion system, comprising:

  • a plurality of power stages connected in series to form a multilevel inverter circuit for connection to a load, the power stages individually comprising;

    a DC link capacitor coupled between first and second DC link nodes of a DC link circuit,an output coupled with at least one other power stage in the multilevel inverter circuit,a switching circuit including a plurality of switching devices to provide an output voltage signal having an amplitude of one of at least two discrete levels, anda single relay or contactor including;

    a coil,a plurality of normally closed contacts operative in a first state to allow current to flow between the switching circuit and the output when the coil is deenergized, and operative in a second state to electrically isolate the switching circuit from the output when the coil is energized, anda normally open contact coupled across the output to allow normal operation of the output in a first state when the coil is deenergized, and to bypass the output in a second state when the coil is energized.

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