Patent ID: 7626463
Filing Date: 2009-12-01
Classification: H03K,H05B

Abstract:
1. A system for automatically allocating to switching devices an on-time that is proportional to a cycle time, comprising: a voltage controlled oscillator configured to receive a tune voltage and configured to output a first signal having a frequency that corresponds to the tune voltage; a charge accumulating circuit; a voltage controlled current source configured to receive the tune voltage or a scaled tune voltage and configured to charge the charge accumulating circuit by outputting a current that corresponds to the received tune voltage or the received scaled tune voltage; a comparator configured to generate a second signal by comparing a voltage of the charge accumulating circuit to a pre-determined set point; and a circuit configured to receive the first signal and the second signal and configured to output a third signal that is a function of the first signal and the second signal, wherein the output of said circuit is coupled to the switching devices.