Patent ID: 9019734
Filing Date: 2015-04-28
Classification: H02M,H02P

Abstract:
1. A system for controlling an electrical load, comprising: a first set of solid state switches controllable to convert AC power to DC power; a regulator coupled to the first set of switches and configured to detect zero crossings of the AC power and system control variables and to generate drive signals for the first set of switches based upon zero crossings of the AC power and system control variables; a second set of solid state switches controllable to convert the AC power to DC power; a gate firing phase shift delay line device having a digital delay line and being coupled to the regulator and configured to generate drive signals for the second set of switches based upon the zero crossings and system control variables but delayed in time with respect to the drive signals for the first set of switches; and means for combining DC power from the first and second sets of switches and for applying the DC power to a load; wherein the second set of switches is switched at times that do not correspond to the zero crossings of the AC power.