Hewlett-packard Development Company, L.p.

Hewlett-packard Company

Robert Bohl

Kelly John Reasoner

Duane L Harmon

Amol Subhash Pandit

Dan Byrne

The dynamic VBUS power source provides a system and method for dynamically powering USB devices. Briefly described, one embodiment is a method comprising determining when the USB device is a master device or a slave device, powering the USB device over a USB connector using a power unit when the USB device is the slave device, and powering a second USB device over the USB connector using the USB device when the USB device is the master device.

System and method for dynamic USB power source

Inventory control devices and methods for controlling the inventory of a data storage system are disclosed. In one embodiment, the inventory control device comprises a sensor to sense a position of an access device of a data storage system, the access device having an open position and a closed position, a circuit communicatively coupled to the sensor to output a circuit state indicating if the access device was opened while the data storage system was shut down, and control logic communicatively coupled to the circuit to cause the data storage system to inventory one or more storage locations associated with the access device only if the circuit state indicates the access device was opened.

Inventory control device

A circuit for sensing the presence of an inductive load that is particularly applicable to sensing when a solenoid is being driven by a pulse width modulation (PWM) signal. The circuit includes a high side connected transistor having an output driving a load, with the transistor driven by a PWM signal. A circulating diode is coupled to the driving output of the transistor. The circuit further comprises an operational amplifier (op amp) circuit that is coupled to the circulating diode and operates as an inverting operational amplifier (op amp). The op amp circuit charges a first capacitor when the transistor releases driving an inductive load.

Apparatus for sensing the presence of an inductive load driven by a pulse width modulated signal

Method and device for reducing the time constant of a system having a conductor connected thereto by connecting an impedance between the conductor and a potential as the voltage on said conductor exceeds a preselected value.

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Fort Collins, CO, United States of America

Robert Bohl