Patent ID: 8134850

Claim:
An unregulated voltage converter having an unregulated output voltage, the unregulated voltage converter comprising: a transformer, wherein the transformer includes a first winding and a second winding; an operational detector, wherein the operational detector provides an electrical output signal as a predetermined function of a voltage input signal applied to the transformer; a controllable oscillator, wherein the controllable oscillator provides a duty cycle clock output with a frequency corresponding to the electrical output; and wherein the clock output at least in part controls application of the voltage input signal applied to the first winding to control ripple in an output of the unregulated voltage converter during times of low duty cycle operation including start-up of the unregulated converter and current limit wherein the frequency of the clock is determined by the equation: Frequency=k*D*(1−D), where D is the duty cycle of duty cycle controlled clock signal and k is a constant.