Inventor

FERRIS TIMOTHY A

US40 patents

⚠️ This page may combine multiple inventors who share the name “FERRIS TIMOTHY A”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

FERRIS TIMOTHY A

WESTERN DIGITAL TECH INC

Disk drive compensating for rotational vibrations, physical shocks, and thermal popping

Disk drive employing spindle motor commutation time variation for reducing acoustic noise

Self-heating integrated circuit

Disk drive adjusting gain of shock detector relative to resonant frequency amplitude

Disk drive employing commutation phase modulation and current modulation of a spindle motor

Methods, systems and devices for converting the kinetic energy of a rotating disk drive spindle motor into electrical energy to charge a rechargeable battery

Disk drive comprising a programmable inverting voltage regulator configured relative to the disk drive&#39;s mode of operation

Output capacitor current as feedback to control a hysteretic voltage regulator

Current balancing circuit for multiple supply voltage systems

Data storage device employing smart braking to unload multiple voice coil motors

Analog-to-digital conversion circuitry with real-time adjusted gain and resolution

Data storage device concurrently controlling and sensing a secondary actuator for actuating a head over a disk

Data storage device compensating for repeatable disturbance when commutating a spindle motor

Data storage device regulating BEMF power voltage during power failure

Data storage device detecting spindle motor position at increased resolution using mutual inductive sense

Data storage device employing predictive oversampling for servo control

Data storage device measuring resonant frequency of a shock sensor by inserting the shock sensor into an oscillator circuit

Data storage device measuring resonant frequency of a shock sensor by applying differential excitation and measuring oscillation

Power control module for data storage device

Data storage device compensating for fabrication tolerances when measuring spindle motor current

Power failure management in disk drives

Data storage device detecting fly height instability of head during load operation based on microactuator response

Data storage device reducing spindle motor voltage boost during power failure

Shock sensor resonance detection for notch filter tuning

Self-heating integrated circuit

Power architecture for low power modes in storage devices

Disk drive implementing hysteresis for primary shock detector based on a more sensitive secondary shock detector

Data storage device adjusting range of microactuator digital-to-analog converter based on operating temperature

Disk drive employing digital accumulators to limit velocity and/or acceleration of microactuator

FERRIS TIMOTHY A

Data storage device employing cascaded voltage regulators during power failure

Voltage quadrupler comprising a second charging capacitor charged using a first charging capacitor

Soft start sequencer for starting multiple voltage regulators

Continuous digital offset cancellation

Disk drive charging capacitor using motor supply voltage during power failure

Data storage device comprising dual mode independent/parallel voltage regulators

3D SYSTEMS INC

Rapid prototyping apparatus with enhanced thermal and/or vibrational stability for production of three dimensional objects

KINETIC ENERGY CORP

Control for gas metal arc welding system

DATAPRODUCTS CORP

High performance incremental motion system using a closed loop stepping motor

RYAN ROBERT P

Detecting startup fault of SDRAM voltage regulator

RICE ALAN P

Disk drive adjusting fly height based on air density measured from rate of temperature change

Disk drive comprising a programmable inverting voltage regulator configured relative to the disk drive's mode of operation