Patent ID: 9006994
Filing Date: 2015-04-14
Classification: G01S,H05B,Y02B

Abstract:
1. A light source circuit for an optical sensor system, the circuit comprising: a power supply to provide a regulated direct current (DC) voltage output to a light source; a voltage feedback circuit to provide a voltage feedback directly from the DC voltage output of the power supply prior to the light source wherein the voltage feedback circuit provides the voltage feedback on a feedback path to the power supply with a voltage divider between the DC voltage output and ground; a current source coupled to the power supply to receive the regulated DC voltage output and to provide a current output to a light source, the current source being configured to provide a current feedback representative of the current output on the feedback path to the power supply prior to the light source; and a switch between the light source and ground, whereby the current source is configured to provide the current output to the light source and the power supply is configured to adjust the DC voltage output in response to the current feedback when the switch is closed and the power supply is configured to adjust the DC voltage output in response to the voltage feedback when the switch is open.