Patent ID: 8970161
Filing Date: 2015-03-03
Classification: H02J,H02M,Y02B,Y02E

Abstract:
1. A modulation control scheme for a photovoltaic system charge controller to control charging of a battery bank with electrical power from a high voltage photovoltaic (PV) array, comprising a photovoltaic system charge controller including a dual active bridge DC to DC converter having a first bridge with four MOSFET switches, a second bridge with four MOSFET switches, and a transformer electrically connecting said first and second bridges and having a total leakage inductance L a modulation control scheme for selectively controlling on and off actions of said switches to control electrical power flow through said converter in a minimum root mean square M-RMS mode of operation to minimize conduction losses and a full zero-voltage switching F-ZVS mode of operation to minimize switching losses, said M-RMS mode of operation having an operating range divided into five main M-RMS operating regions and four transition M-RMS operating regions respectively located between adjacent main M-RMS operating regions based on the value of a voltage component V