Patent ID: 7557549
Filing Date: 2009-07-07
Classification: H02P

Abstract:
1. A controller adapted to drive a load, wherein the load has a resistance, comprising: an output that can drive the load in either a current controlled mode or a voltage controlled mode; a determining block for determining a measure related to the resistance of the load, wherein the determining block includes a current sensing block and a voltage sensing block, the current sensing block is configured to sense a measure related to the current passing through the load, the voltage sensing block is configured to sense a measure related to a voltage across the load, wherein the measure related to the resistance of the load is determined by comparing the measure related to the current passing through the load and the measure related to the voltage across the load; and wherein the controller enters one of the current controlled mode or the voltage controlled mode depending on the measure related to the resistance of the load determined by the determining block.