Patent ID: 8184670
Filing Date: 2012-05-22
Classification: H01S,H05B,Y02B

Abstract:
1. Method of operating a load which is laser or light emitting diodes in a pulse mode with a diode driver comprising: providing a storage capacitor; providing a power supply receiving input power and providing output power for charging the storage capacitor to a capacitor bank voltage (Vr); providing a current sense device, having an output providing a current sense signal indicative of a current flowing through the load; providing a current control device for controlling the current flowing through the load in response to a current control signal; providing a controller having inputs for capacitor bank voltage (Vr) and the current sense signal, and outputting the current control signal, and the controller further has a voltage set output for setting the bank voltage (Vr) output by the power supply; with the controller, adjusting the power supply voltage to ensure minimum voltage across the current control device at the end of a pulse and minimize its dissipation; and measuring temperature of the load and providing a signal to the controller to make a feed-forward adjustment to allow a more rapid setting of a correct voltage with lower instantaneous peak power in the current control device.