Transmit end supporting multi-device wireless charging, charging base, and system

Patent metadata

Field	Value
Publication number	US-12368328-B2
Application number	US-202318193616-A
Country	US
Kind code	B2
Filing date	Mar 30, 2023
Priority date	Oct 15, 2020
Publication date	Jul 22, 2025
Grant date	Jul 22, 2025

Abstract

A transmit end for multi-device wireless charging includes N half-bridge inverter circuits, a multi-coil gating matrix, and a multi-coil module. Input terminals of the N half-bridge inverter circuits are connected to corresponding direct currents, and output terminals of the N half-bridge inverter circuits are connected to input terminals of the multi-coil gating matrix. The multi-coil gating matrix includes a plurality of switches configured to respectively connect the output terminals of the N half-bridge inverter circuits to corresponding transmit coils in the multi-coil module.

First claim

The invention claimed is:

1. An apparatus for wireless charging, comprising:
a direct current/direct current conversion module configured to convert an output voltage of an adapter to N direct currents, N being an integer equal to or larger than 2;
N half-bridge inverter circuits;
a multi-coil gating matrix; and
a multi-coil module,
wherein the direct current/direct current conversion module comprises an open-loop direct current/direct current circuit and N first closed-loop direct current/direct current circuits, an input terminal of the open-loop direct current/direct current circuit is connected to an output terminal of the adapter to receive the output voltage, N output terminals of the open-loop direct current/direct current circuit are connected to respective input terminals of the N first closed-loop direct current/direct current circuits;
wherein N input terminals of the N half-bridge inverter circuits are respectively connected to the N output terminals of the N first closed-loop direct current/direct current circuits to receive the N direct currents, and output terminals of the N half-bridge inverter circuits are connected to input terminals of the multi-coil gating matrix, and
wherein the multi-coil gating matrix comprises a plurality of switching switches configured to respectively connect the output terminals of the N half-bridge inverter circuits to corresponding transmit coils in the multi-coil module.

2. The apparatus according to claim 1 , wherein the open-loop direct current/direct current circuit is an open-loop buck circuit or an open-loop boost circuit, each of the N first closed-loop direct current/direct current circuit is a first closed-loop boost circuit or a first closed-loop buck circuit.

3. The apparatus according to claim 2 , wherein the open-loop direct current/direct current circuit comprises a switched-capacitor circuit, and the first closed-loop buck circuit comprises a buck circuit.

4. The apparatus according to claim 3 , further comprising a controller configured to:
when the output voltage of the adapter is less than a preset voltage, control the switched-capacitor circuit to operate in a boost state, and
control the buck circuit to operate in a buck state.

5. The apparatus according to claim 4 , wherein the controller is further configured to:
when the output voltage of the adapter is adjustable by level, control the switched-capacitor circuit to operate in a straight-through state, and
control the buck circuit to operate in a buck state.

6. The apparatus according to claim 4 , wherein the controller is further configured to:
when the output voltage of the adapter is continuously adjustable, control the switched-capacitor circuit to operate in a straight-through state, and
control the buck circuit to operate in a straight-through state.

7. The apparatus according to claim 1 , wherein each of the N half-bridge inverter circuits comprises a bridge arm, and the bridge arm comprises two controllable switching transistors connected in series.

8. The apparatus according to claim 7 , wherein the two controllable switching transistors connected in series are a first switching transistor and a second switching transistor,
a first terminal of the first switching transistor is connected to a positive electrode of the direct current, a second terminal of the first switching transistor is connected to a first terminal of the second switching transistor, and a second terminal of the second switching transistor is connected to a negative electrode of the direct current; and
the second terminal of the first switching transistor serves as an output terminal of the half-bridge inverter circuit and is connected to the input terminal of the multi-coil gating matrix.

Assignees

• Huawei Digital Power Tech Co Ltd

Inventors

• Li Yuechao
• Cai Bing

Classifications

• H02M7/5387

  in a bridge configuration · CPC title

• H02M3/155

  using semiconductor devices only · CPC title

• H02J2207/20

  Charging or discharging characterised by the power electronics converter · CPC title

• H02J50/12

  of the resonant type · CPC title

• H02J50/40

  using two or more transmitting or receiving devices (H02J50/50 takes precedence) · CPC title