US 2021/0175009 A1Published application

Wireless Power Transmission with Current-Limiting Coil

AssigneeSilanna Asia Pte Ltd

InventorsPasi Tapani Tikka, Kalle Arulaane, Martin Kortsparn

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Abstract

A wireless power transmission system includes a transmitter coil in a power transmitting circuit and a receiver coil in a power receiving circuit. Either the receiver coil serves as a current-limiting coil or the system also includes a current-limiting coil that is separate from the transmitter coil and the receiver coil. The transmitter coil generates a magnetic field from a transmitter current flowing therethrough. The current-limiting coil generates an opposing magnetic field from the magnetic field, which limits the transmitter current, in a current-limiting mode.

Claims8

Dependent claims

A wireless power transmission system comprising:

a transmitter coil in a power transmitting circuit, the transmitter coil generating a magnetic field for transmitting electromagnetic power by a transmitter current flowing within the transmitter coil;
and
a receiver coil in a power receiving circuit and that can be disposed within the magnetic field, the receiver coil being configured to operate in a power receiving mode and to operate in a current-limiting mode, the receiver coil receiving at least a portion of the electromagnetic power from the magnetic field, the receiver coil generating a receiver current and a first opposing magnetic field from the magnetic field in the power receiving mode, the receiver coil generating a second opposing magnetic field from the magnetic field without generating the receiver current in the current-limiting mode, the second opposing magnetic field having a greater magnitude than that of the first opposing magnetic field, and the second opposing magnetic field limiting the transmitter current.

A method comprising:

generating a transmitter current in a power transmitting circuit;
applying the transmitter current to a transmitter coil in the power transmitting circuit;
the transmitter coil generating a magnetic field for wirelessly transmitting electromagnetic power due to the transmitter current;
during a non-current-limiting mode, the transmitter coil receiving a first opposing magnetic field that is generated from the magnetic field by a receiver coil that is disposed within the magnetic field;
during a current-limiting mode, the transmitter coil receiving a second opposing magnetic field that is generated from the magnetic field by the receiver coil, the second opposing magnetic field having a greater magnitude than the first opposing magnetic field in the current-limiting mode;
and
during the current-limiting mode, limiting the transmitter current in the power transmitting circuit below a safe operating current threshold due to the second opposing magnetic field.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/249,111Filed 19 Feb 2021
Priority: 16 May 2019
Published: 10 Jun 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H01F 27/34
Details of transformers or inductances, in general: special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load…
H01F 27/38
Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations,…:…
H01F 38/14
Adaptations of transformers or inductances for specific applications or functions: inductive couplings
H02J 50/12
Using inductive coupling: of the resonant type

Family

Application16/413,960Division · filed 16 May 2019
Application17/249,111Division
US 2020/0365316 A1Published application
US 2021/0175009 A1This patent

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

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