US 11,309,738 B2Granted

Recovery of modulation amplitude in wireless charger tx demodulation

AssigneeIntegrated Device Technology, Inc.

InventorsYue Wang, Lijie Zhao

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Abstract

In accordance with aspects of the present invention, a method and apparatus for demodulating an amplitude-modulated wireless power signal is presented. A method of receiving an amplitude modulated component of a wireless power transmission signal according to some embodiments includes receiving an input signal, wherein the input signal is based on an amplitude modulated wireless power signal; and applying an offset to the input signal to receive the amplitude modulated component. A demodulator according to some embodiments can include a first voltage-to-current converter that receives an input signal related to an amplitude modulated wireless power signal; a second voltage-to-current converter that receives an offset signal; and a summing node that adjusts a first current produced by the first voltage-to-current converter by a second current produced by the second voltage-to-current converter to produce an output signal.

Claims3

Dependent claims

A method of receiving an amplitude modulated component of a wireless power transmission signal, comprising;

receiving an input signal by converting the input signal to an input current signal, wherein the input signal is based on the amplitude modulated wireless power signal of the wireless power transmission signal;
applying an offset to the input signal to produce an output signal, wherein applying an offset includes converting an offset voltage to an offset current and subtracting the offset current from the input current signal to create the output signal such that the output signal is primarily an amplitude modulation portion of the amplitude modulated wireless power signal;
and
processing the output signal to receive the amplitude modulated component, wherein processing the output signal includes converting the output current signal to a voltage output signal representing the amplitude modulated component, wherein a modulation amplitude of the voltage output signal is greater than a modulation amplitude of the input signal.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 16/052,492Filed 1 Aug 2018
Published: US 2020/0044486 A16 Feb 2020
Granted: 19 Apr 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H02J 50/80
Circuit arrangements or systems for wireless supply or distribution of electric power: involving the exchange of data, concerning supply or…
H02J 50/12
Using inductive coupling: of the resonant type
H04B 5/24
Characterised by the transmission technique; characterised by the transmission medium: inductive coupling
H04B 5/266
Using coils: one coil at each side, e.g. with primary and secondary coils

Family

US 2020/0044486 A1Pre-grant publication · published 6 Feb 2020
US 11,309,738 B2This patent

From the US filing history. Foreign family members aren’t listed.

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