#NuVolta Technologies (Hefei) Co., Ltd.

Method and Apparatus for Wireless Power Transfer with Resonant Capacitor Switching

An apparatus for wireless power transfer includes a resonant circuit comprising: a transmitter coil; a first capacitor connected with the transmitter coil in series; and a second capacitor connected i…

DRIVE·Mar 19·1 min read

H02J50/12 NuVolta Technologies (Hefei) Co., Ltd.

Demodulation Apparatus and Method for Wireless Power Transfer Systems

An apparatus includes a differential amplifier unit having a first input coupled to a common node of a first coil and a first resonant capacitor, and a second input coupled to a switching node of a br…

DRIVE·Oct 24·1 min read

H02J50/12 NuVolta Technologies (Hefei) Co., Ltd.

Wireless Power Communication Apparatus and Method

An apparatus includes a rectifier coupled to a receiver coil, the receiver coil configured to be magnetically coupled to a transmitter coil of a wireless power transfer system, wherein the rectifier i…

DRIVE·Sep 19·1 min read

H02J50/80 NuVolta Technologies (Hefei) Co., Ltd.

Structures for In-Band Communications in Wireless Charging

An apparatus for wireless power reception includes a receiver coil and a rectifier having a first input and a second input, the first input coupled to a first terminal of a receiver coil, the second i…

DRIVE·May 23·2 min read

H02J50/12 NuVolta Technologies (Hefei) Co., Ltd.

Voltage Sampling Apparatus and Method

An apparatus includes a first sampling switch coupled between a first voltage bus and a sampling capacitor, a first clock generator configured to produce a first gate drive signal fed into a gate of t…

DRIVE·May 16·1 min read

G01R31/396 NuVolta Technologies (Hefei) Co., Ltd.

Wireless Power Transfer System and Control Method Thereof

A wireless power transfer system and a control method thereof. The wireless power transfer system includes: a transmitter coil configured to be magnetically coupled to a receiver coil; a power convers…

DRIVE·May 4·1 min read

H02J50/60 NuVolta Technologies (Hefei) Co., Ltd.

Foreign Object Detection Apparatus and Method for Wireless Power Transfer System

A method includes wirelessly transferring power through a main coil of a wireless power transfer system, wherein the main coil is connected in series with a main resonant capacitor, and the main coil …

DRIVE·Dec 1·1 min read

H02J50/60 NuVolta Technologies (Hefei) Co., Ltd.

Rectifier in Low Gain Wireless Power Transfer System

An apparatus includes a controller configured to control switches of a rectifier circuit, wherein the rectifier circuit is coupled to two terminals of a receiver coil configured to be magnetically cou…

DRIVE·Oct 6·1 min read

H02J50/12 NuVolta Technologies (Hefei) Co., Ltd.

Rectifier in Low Gain Wireless Power Transfer System

An apparatus includes a receiver coil configured to be magnetically coupled to a transmitter coil, and a rectifier circuit coupled to two terminals of the receiver coil, wherein in response to a high …

DRIVE·Oct 6·1 min read

H02J50/12 NuVolta Technologies (Hefei) Co., Ltd.

Low Gain Wireless Power Transfer System and Method

An apparatus includes a controller configured to control switches of a receiver, the receiver comprising a first receiver coil configured to be magnetically coupled to a transmitter coil of a wireless…

DRIVE·Sep 22·1 min read

H02J50/12 NuVolta Technologies (Hefei) Co., Ltd.

Low Gain Wireless Power Transfer System and Method

An apparatus includes a first receiver coil configured to be magnetically coupled to a transmitter coil, a rectifier circuit coupled to two terminals of the first receiver coil, a second receiver coil…

DRIVE·Sep 22·1 min read

H02J50/12 NuVolta Technologies (Hefei) Co., Ltd.

Q-Factor Determination Apparatus and Method for Wireless Power Transfer System

A method includes applying an excitation including a voltage step to a resonant tank comprising a first coil and a capacitor, comparing a damped sinusoidal waveform having a resonant attenuation envel…

DRIVE·Aug 11·1 min read

H02J50/12 NuVolta Technologies (Hefei) Co., Ltd.

High Efficiency Power Converting Apparatus

A system includes a first coil configured to be magnetically coupled to a second coil, a rectifier coupled to the first coil through a capacitor, a first power stage connected between an output of the…

DRIVE·Jul 14·1 min read

H02J7/00 NuVolta Technologies (Hefei) Co., Ltd.

High Voltage Hybrid Charging System and Method

A method includes configuring a high voltage charging system to operate in a wireless charging mode to charge a battery after a power source has been disconnected from the high voltage charging system…

DRIVE·Nov 18·1 min read

H02J50/12 NuVolta Technologies (Hefei) Co., Ltd.

H-Bridge Gate Control Apparatus

An apparatus includes a rectifier coupled to a coil of a wireless power transfer system, the rectifier comprising a first leg and a second leg, wherein the first leg comprises a first switch and a sec…

DRIVE·Nov 11·1 min read

H02J50/12 NuVolta Technologies (Hefei) Co., Ltd.

Overvoltage Protection Device and Method Thereof

A device includes a rectifier connected to a receiver coil, a first overvoltage protection apparatus connected between inputs of the rectifier and ground, and a second overvoltage protection apparatus…

DRIVE·Sep 2·1 min read

H02H7/1252 NuVolta Technologies (Hefei) Co., Ltd.

Current Sense Apparatus and Method

A system includes a power regulator coupled between a coil and a battery, wherein the power regulator is configured as a linear regulator when power is provided from the coil to the battery, and a cur…

DRIVE·May 6·1 min read

G01R19/003 NuVolta Technologies (Hefei) Co., Ltd.