Northrop Grumman Systems Corporation

James W Blair

Edwin G Cox

Kristy M Grant

A system and method are disclosed for providing a high efficiency bypass circuit for multi-stage direct current to direct current (DC-DC) converters used in battery powered systems. When the system is operating in a battery mode, the vehicle power source is unplugged from the power supply input connector and the external battery is connected in its place. The system uses a relay to bypass the flyback converter so as to connect the boost converter output directly to the output terminals. The system uses a single control signal to: 1) energize the relay connecting the boost converter output directly to the output terminals, 2) adjust the boost converter circuit to cause the boost converter to deliver a voltage equal to what the flyback converter would have delivered, and 3) disable the flyback converter.

System and method for providing a high efficiency bypass circuit for multi-stage DC-DC converters used in battery powered systems

A battery temperature compensation circuit for a DC/DC converter which is used to charge an auxiliary battery for an electric vehicle and including, among other things, a voltage sensitive resistance, such as a thermistor, coupled to a clamped voltage divider network which generates a resistance vs. temperature characteristic so as to control the DC/DC converter and provide an output voltage for charging the auxiliary battery which matches the voltage vs. temperature profile of the battery.

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Ellicott City, MD, United States of America

James W Blair