Abstract: A power converter receiving a single-sided supply which is ground-terminated and providing a positive supply and a regulated negative supply that is optimized to the expected output range of a class AB amplifier, as well as providing a symmetric positive supply having excellent efficiency. The converter finds application as a compact converter to power an audio amplifier driving an audio device which is ground terminated, such as a speaker.

Abstract: A dual output buck-boost power converter operates with a single inductor to achieve high efficiency with automatic or inherent load balancing. Switches associated with the opposite polarity outputs are driven based on feedback signals, with one feedback signal being a reference voltage and another feedback signal being related to an opposite polarity output. The opposite polarity feedback signal is provided to a comparator with a reversed polarity to achieve a simple balanced control that maintains polarity outputs. The power converter delivers power to each output with each switching cycle and uses a single inductor to achieve high efficiency performance.

Abstract: A brake for a hydraulic device of the type in which a train of driving or driven shafts includes at least one shaft adapted for orbital and rotational motion. One or more frictional braking members are fixedly secured to the rotating and orbiting shaft, and are adapted to be frictionally engaged by a fixed member to apply a braking torque to the shaft. A preferred embodiment discloses a particularly advantageous manner in which such a braking device is applied to a hydraulic motor wherein the orbital and rotational motion of the driven shaft which is braked is provided by a gerotor gearset.