Trw Automotive U.S. LLC

Mark Emerson Grandy

Christopher Nelson St John

Jonathan Joseph Kuhn

A switching mode power supply generating reduced high frequency noise. The power supply includes a solid state switch, a modulator for driving the solid state switch with a periodic pulse drive signal, an output filter at the output of the solid state switch, where the output filter includes an inductor and a catch diode. A damping element is included for damping current spikes through the catch diode when said solid state switch turns on and thus reduce noise pulses that would otherwise be introduced by the current spikes.

RF noise reduction in switching mode power supplies

Apparatus for use in a system, including a microcontroller for controlling the system, where the microcontroller includes at least one internal module capable of generating a periodic pulse signal. The microcontroller is programmed and operated so that the internal module generates a periodic pulse signal that is a pseudo-random spread spectrum oscillator signal. A switching mode power supply is responsive to the pseudo-random spread spectrum oscillator signal. The switching mode power supply comprises a solid state switch and a modulator for driving the solid state switch with a drive signal related to the periodic pulse signal generated by the internal module of the microcontroller.

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Livonia, MI, United States of America

Mark Emerson Grandy