Patent ID: 8989598
Filing Date: 2015-03-24
Classification: H05B,Y02B

Abstract:
1. A circuit configured to provide a bias and/or driving current, comprising: a) a driver configured to provide said bias and/or driving current to a current-driven load; b) a sense circuit configured to (i) sense said bias and/or driving current and (ii) convert said bias and/or driving current to a first voltage; and c) a comparator comprising (i) a first amplifier configured to receive said first voltage and a first reference voltage, and provide an output voltage, and (ii) a second amplifier configured to receive said output voltage and a second reference voltage, and provide a feedback and/or error signal to said driver, said feedback and/or error signal configured to maintain or adjust said bias and/or driving current at or towards a target value; and d) a microcontroller or microprocessor configured to control values of the first and second reference voltages provided to the comparator, wherein the value of the first reference voltage corresponds to or is proportional to the bias and/or driving current, and the value of the second reference voltage maintains the bias and/or driving current at a minimum value necessary to drive the current-driven load.