H - Electricity – 02 – H
Patent
H - Electricity
02
H
H02H 7/125 (2006.01) H02M 1/32 (2007.01) H02M 1/08 (2006.01) H02M 7/217 (2006.01)
Patent
CA 2559291
A switch-type power converter comprising an FET switch operating in a variable duty cycle mode under the control of a Unitrode 3846 integrated circuit controller. Indications of excess input voltage and reverse battery connections are provided by circuits including an element which permanently changes state. A cooling tan mounted on a finned heat sink is operated in a variable speed mode. A single thermistor sensor provides inputs to both the fan speed control and a thermal shutdown circuit connected to shut clown the gate drives to the FET switch in the event of a high temperature condition. another shutdown function is provided in response to an input overvoltage condition by way of an operational amplifier. The converter uses foldback for short circuit protection and is compatible with microprocessor units to selectively provide multiple output voltage levels.
Progressive Dynamics Inc.
Ridout & Maybee Llp
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