Enerdel, Inc.

Justin Ian Kimes

David Lawrence Albean

Ronald Jaeger

Timothy Scalzo

David Heady

Charlie Capps

A battery charging system includes a pre-charge control circuit for electrically coupling a plurality of power supply terminals to a plurality of load terminals. The pre-charge control circuit includes a plurality of switching elements for selectively coupling at least one of the plurality of power supply terminals and one of the plurality of power supply using one of a pre-charge current path and a standard charge current path. The pre-charge current path includes at least one pre-charge resistor in series with a positive temperature coefficient (PTC) resistor.

Self protecting pre-charge circuit

System and methods are provided for monitoring a state of a switch element connecting a DC power supply to a load. A system includes a transformer having first and second windings, where a first end of the second winding electrically coupled to a first switch node of the switch element. The system also includes a transmit circuit configured for providing a waveform at the first winding and a sensor element having galvanically isolated input and output nodes for inducing a monitor signal at the output nodes in response to a signal at the input nodes. The system further includes a receive circuit coupled to the output nodes and configured for generating one or more output signals in response to the monitor signal. The system also includes capacitor elements for providing DC isolation for the second winding with respect to the first switch node and the sensor element.

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Indianapolis, IN, United States of America

Justin Ian Kimes