Flextronics Ap, LLC

Power Systems Technologies Gmbh

Garrity Power Services LLC

Semtech Corporation

Antony Eugene Brinlee

Paul James Garrity

Aaron Jungreis

Arturo Silva

Sriram Chandrasekaran

Ross Elliot Teggatz

Steven Mark Malechek

A transmitter comprising a planar antenna including a ground plane and first and second spiral radiating elements wrapping around the ground plane, and a driving circuit. Proximal ends of the spiral radiating elements terminate near points located along a perimeter of the ground plane. Exactly one of the first and second spiral radiating elements are electrically isolated from the ground plane. The first and second spiral radiating elements are wound in the same direction for approximately a single turn and increase in thickness for approximately three-fourths of the turn. The driving circuit drives one of the first and second spiral radiating elements.

Planar broad-band transmitter

A circuit arrangement is disclosed for controlling the switching of a field effect transistor (FET). A current controlled amplifier may be configured to amplify a current in a current sense device to generate an amplified current, wherein the current in the current sense device indicates a current through the FET. A comparator may be coupled to the current sense amplifier to compare a voltage corresponding to the amplified current with a voltage reference and to generate a comparator output based on the comparison, wherein the comparator output controls whether the FET is on or off.

Voltage comparator

An antenna is disclosed that includes a ground plane extending in a first direction on a substrate and a radiating element occupying a same plane as the ground plane on the substrate, and coupled to the ground plane, the radiating element comprising a first portion with a first end and a second end extending in a substantially parallel direction to the ground plane, a feed line coupled to the first end of the first portion of the radiating element and extending in a substantially perpendicular direction from the first portion of the radiating element and a second portion having a third end and a fourth end, wherein the third end is coupled to the ground plane and the fourth end is coupled to the radiating element at a point between the first end and the second end.

Single layer antenna

Current controlled amplifier

LLC converter with wake-up circuitry

A wirelessly-powered locker comprises a transmitting antenna mounted to or embedded within a locker wall and a receiving antenna coupled to the lock. A power source connected to a transmitter transmits power to a wireless receiver in the lock via radiated wireless power. The wireless power operating frequency may be in the ISM band. The lock may further include wireless communication means to allow wireless transmission of an unlock code to the lock or wireless monitoring of the lock.

Wirelessly powered locker

Flyback converter with wake-up circuitry

High speed sync FET control

A controller for a power converter and method of operating the same. In one embodiment, the controller includes an inductor-inductor-capacitor ('LLC') controller configured to receive an error signal from an error amplifier to control a switching frequency of an LLC stage of the power converter to regulate an output voltage thereof. The controller also includes a power factor correction ('PFC') controller configured to control a bus voltage produced by a PFC stage of the power converter and provided to the LLC stage so that an average switching frequency thereof is substantially maintained at a desired switching frequency.

Controller for a power converter and method of operating the same

A start-up circuit for a power adapter and method of operating the same. In one embodiment, the power adapter includes a start-up circuit configured to provide an initial bias voltage for the power adapter. The power adapter also includes a crowbar circuit configured to turn on the start-up circuit upon loss of an ac mains voltage supplied to the power adapter.

Start-up circuit for a power adapter

A resonant power converter draws current from a source that provides a supply current. Multiple quasi-resonant converters are interleaved and each quasi-resonant converter receives the supply current and forms a phase-shifted current according to drive signals supplied by a controller. Each phase-shifted current includes a dead-time delay and is phase-shifted relative to the other phase-shifted currents. The dead-time delay is determined as a time value within a calculated dead-time delay range having a dead-time delay minimum and a dead-time delay maximum. The outputs of each quasi-resonant converter are added together thereby reducing the AC components of current. Two, three, or four quasi-resonant power converters can be interleaved, each forming phase-shifted currents that are phase-shifted relative to the other phase-shifted currents.

Power converter using multiple phase-shifting quasi-resonant converters

A power converter employing a control system configured to make multiple functional use of a circuit node therein and method of operating the same. In one embodiment, the power converter includes a power train including at least one power switch. The power converter also includes a control system including an opto-isolator circuit, including a resistor, configured to receive an output signal from the power converter and provide a feedback signal to a feedback node for the control system to provide a switch control signal for the at least one power switch. The control system also includes a current source configured to produce multiple voltage levels at the feedback node in accordance with the resistor, thereby enabling multiple functional uses of the feedback node.

Control system for a power converter and method of operating the same

A power adapter including a power reducer for no-load or light load applications and method of operating the same. In one embodiment, the power adapter includes a capacitor coupled to an input of the power adapter, and a bleeder switch coupled in parallel with the capacitor. The power adapter also includes a detection circuit configured to sense an ac mains voltage at the input of the power adapter and turn on the bleeder switch upon detection of a loss of the ac mains voltage. In addition to or in lieu of, the power adapter may include a power converter, and a disconnect switch configured to disconnect the ac mains voltage from the power converter in response to a signal from a load.

Growing community of inventors

Plano, TX, United States of America

Antony Eugene Brinlee