Wireless charging

Patent metadata

Field	Value
Publication number	US-11095170-B1
Application number	US-202016931111-A
Country	US
Kind code	B1
Filing date	Jul 16, 2020
Priority date	Jul 16, 2020
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

A system and method for improving ASK packet transfer reliability and power dissipation efficiency at light-load or no-load conditions of a receiving device is provided. In an embodiment, the receiving device includes a dissipating element coupled to a rectifier. The dissipating element is connected to a reference voltage at a first duration corresponding to a transmission of the ASK packet. The dissipating element is disconnected from the reference voltage a second duration corresponding to an end of the transmission of the ASK packet.

First claim

What is claimed is:

1. A receiving device comprising:
a rectifier;
a dissipating element coupled to an output of the rectifier;
a transistor coupled to the dissipating element;
a non-transitory memory storage comprising instructions; and
a processor in communication with the non-transitory memory storage and coupled to the transistor, wherein the processor executes the instructions to:
electrically couple, by the transistor, the output of the rectifier through the dissipating element to a reference voltage for a first duration corresponding to a transmission of a packet by the receiving device, and
decouple, by the transistor, the output of the rectifier from the reference voltage for a second duration corresponding from an end of the transmission of the packet to a transmission of a next packet by the receiving device.

2. The receiving device of claim 1 , wherein the processor executes the instructions to determine that a light-load condition or a no-load condition is present at the receiving device before coupling or decoupling of the output of the rectifier to the reference voltage through the dissipating element.

3. The receiving device of claim 1 , wherein the transmission at the first duration corresponds to a light-load condition or a no-load condition at the receiving device.

4. The receiving device of claim 3 , wherein the light-load condition corresponds to a less than 50 milliamp current draw at the dissipating element.

5. The receiving device of claim 1 , wherein the first duration extends to about 1-10 milliseconds before the start of the transmission of the packet and 1-10 milliseconds after the end of the transmission of the packet.

6. The receiving device of claim 1 , wherein the second duration excludes about 1-10 milliseconds before the end of the transmission of the packet and 1-10 milliseconds after the start of the transmission of the next packet.

7. The receiving device of claim 1 , wherein the transmission at the first duration corresponds to a communication based on amplitude modulation.

8. The receiving device of claim 1 , wherein the receiving device is a semiconductor package.

9. The receiving device of claim 1 , wherein the receiving device is a mobile device, a tablet, a cellular phone, a wearable communications device, a digital pen, a wireless headphone, a toothbrush, or an internet of things (IOT) device.

10. A method comprising:
receiving, by a transistor in a device, a first control signal for a first duration corresponding to a transmission of a packet by the device;
electrically coupling, by the transistor, an output of a rectifier of the device through a dissipating element to a reference voltage in response to receiving the first control signal;
receiving, by the transistor, a second control signal at a second duration corresponding from an end of the transmission of the packet to a transmission of a next packet by the device; and
decoupling, by the transistor, the output of the rectifier from the reference voltage in response to receiving the second control signal at the transistor.

11. The method of claim 10 , further comprising determining that a light-load condition or a no-load condition is present at the device before the coupling or decoupling of the output of the rectifier to the reference voltage through the dissipating element.

12. The method of claim 10 , wherein the transmission at the first duration corresponds to a light-load condition or a no-load condition at the device.

13. The method of claim 12 , wherein the light-load condition corresponds to a less than 50 milliamp current draw at the dissipating element.

14. The method of claim 10 , wherein the first duration extends to about 1-10 milliseconds before the transmission of the packet and 1-10 milliseconds after a duration of the transmission of the packet.

15. The method of claim 10 , wherein the second duration excludes about 1-10 milliseconds before the transmission of the packet and 1-10 milliseconds after a duration of the transmission of the packet.

16. The method of claim 10 , wherein the transmission at the first duration corresponds to a communication based on an amplitude-shift keying (ASK) modulation.

17. A device comprising:
a rectifier configured to operate in a first state and a second state, wherein in the first state, a current load path is enabled for a duration corresponding to a transmission of a packet by the device and an output of the rectifier is coupled to a reference voltage through a resistor along the current load path, and wherein in the second state, the current load path is disabled for a duration corresponding from an end of the transmission of the packet to a transmission of a next packet by the device.

18. The device of claim 17 , wherein the device comprises a switch electrically coupled to the resistor, the switch configured to:
enable the current load path in the first state; and
disable the current load path in the second state.

19. The device of claim 18 , wherein the transmission of the packet corresponds to the device being in a light-load condition or a no-load condition.

20. The device of claim 17 , the resistor is configured to:
provide a minimum load at the output of the rectifier for the duration corresponding to a transmission of the packet; and
provide an open load for the duration corresponding from the end of the transmission of the packet to the transmission of the next packet by the device.

Assignees

• Stmicroelectronics Shenzhen R&D Co Ltd

Inventors

• Wang Jiasheng

Classifications

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• H02J7/40

  characterised by the exchange of charge or discharge related data · CPC title

• H02J7/47

  Arrangements for checking compatibility or authentication between one component, e.g. a battery or a battery charger, and another component, e.g. a power source · CPC title

• H02J50/80 Primary

  involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices · CPC title

• H02J50/20

  using microwaves or radio frequency waves · CPC title