MULTIMODE WIRELESS POWER RECEIVER CIRCUIT

• US 20180083487A1
• Filed: 09/16/2016
• Published: 03/22/2018
• Est. Priority Date: 09/16/2016
• Status: Active Grant

• Current Assignee: Integrated Device Technology Incorporated (Renesas Electronics Corporation)
• Original Assignee: Integrated Device Technology Incorporated (Renesas Electronics Corporation)
• Inventors: Nalbant, Mehmet
• Granted Patent: US 10,608,471 B2
• Time in Patent Office: Days
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 7/00308 Overvoltage protection

Abstract

A multimode receiver can include on or more of an over-voltage protection circuit or a high frequency mode switch. As such, some embodiments of a multi-mode receiver includes a rectifier; a high frequency circuit coupled to the rectifier; a low frequency circuit coupled to the rectifier; and a switching circuit coupled to disable at least a portion of the low frequency circuit while the multi-mode receiver operates in high frequency mode. In some embodiments, the multimode receiver further includes a high-voltage protection circuit coupled to the high frequency circuit that detunes the high frequency circuit when a high-voltage condition is detected.

Claims

1. A multi-mode receiver, comprising:

a rectifier;

a high frequency circuit coupled to the rectifier;

a low frequency circuit coupled to the rectifier; and

a switching circuit coupled to disable at least a portion of the low frequency circuit while the multi-mode receiver operates in high frequency mode.

2. The receiver of claim 1, wherein the high frequency circuit includes

a coil;

and

a shunt capacitor coupled in parallel with the coil,

wherein the switching circuit is configured to couple both sides of the shunt capacitor to a ground through capacitors in high frequency mode.

3. The receiver of claim 2, wherein the switching circuit comprises:

a first transistor configured to couple a first side of the shunt capacitor to the ground through a first capacitor;

a second transistor configured to couple a second side of the shunt capacitor to the ground through a second capacitor,

wherein a controller provides a signal to gates of the first transistor and the second transistor, the signal depending on high frequency operation.

4. The receiver of claim 1, further including an over voltage protection circuit coupled to the high frequency circuit.

5. The receiver of claim 4, wherein the over voltage protection circuit de-tunes the high frequency circuit when an over voltage condition is detected.

6. The receiver of claim 5, wherein the over-voltage protection circuit includes

an overvoltage protection circuit configured to provide an overvoltage signal when the overvoltage condition is detected;

and

transistors driven by the overvoltage signal of the overvoltage protection circuit to change a resonant frequency of the high frequency circuit.

7. A method of receiving power wirelessly, comprising:

detecting a low frequency mode or a high frequency mode of power receipt;

receiving power in a low frequency circuit if the low frequency mode is detected;

disabling the low frequency circuit and receiving power in a high frequency circuit if the high frequency mode is detected; and

rectifying power from the low frequency circuit and the high frequency circuit with a single rectifier.

8. The method of claim 7, wherein disabling the low frequency circuit comprises:

coupling both sides of a shunt capacitor in the low frequency circuit to a ground when a high frequency mode is detected.

9. A receiver, comprising:

a high frequency receiver including first inductor coupled in parallel with a first capacitor;

a rectifier coupled across the high frequency receiver; and

an over-voltage protection circuit coupled across the high frequency receiver, the over-voltage protection circuit de-tuning the high frequency receiver when an overvoltage condition is detected.

10. The receiver of claim 9, further including

a low-frequency receiver;

and

a switching circuit coupled to disable a part of the low frequency receiver during operation of the high frequency receiver.