Electronic device and method of detecting efficiency of charging

Patent metadata

Field	Value
Publication number	US-9780599-B2
Application number	US-201514859372-A
Country	US
Kind code	B2
Filing date	Sep 21, 2015
Priority date	Oct 31, 2014
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

An electronic device includes an energy collection circuit, a rectifier circuit, and a control unit. The energy collection circuit receives an energy signal transmitted via transmission frequency from a wireless charger base. The rectifier circuit generates a drive voltage according to the energy signal. The control unit compares the drive voltage with a reference voltage, and compares the transmission frequency with a reference frequency. When the drive voltage is less than or equals to the reference voltage, or when the transmission frequency is lower than or equals to the reference frequency, the control unit outputs position deviation information. The electronic device detects the efficiency of the wireless charging, and reminds the user whether the position of the electronic device needs to be adjusted, which ensures an efficient charging.

First claim

What is claimed is:

1. An electronic device, comprising:
an energy collection circuit including a coil, receiving an energy signal transmitted from a wireless charger base, wherein the energy signal includes a transmission frequency;
a rectifier circuit coupled to the energy collection circuit to generate a drive voltage according to the energy signal;
a control unit coupled to the energy collection circuit for comparing the drive voltage and a reference voltage and comparing the transmission frequency and a reference frequency, respectively;
a first voltage division circuit coupled to the coil to divide voltage of the energy signal to generate a first voltage;
a second voltage division circuit coupled to the rectifier to divide a voltage of the drive voltage to generate a second voltage; and
a comparator coupled between the first voltage division circuit and the second voltage division circuit and generating a detection signal according to the first voltage,
wherein a voltage level of the detection signal changes with a level of the second voltage, and a frequency of the detection signal changes with a frequency of the first voltage,
wherein when the drive voltage is less than or equals to the reference voltage, or when the transmission frequency is lower than or equals to the reference frequency, position deviation information is outputted.

2. The electronic device according to claim 1 ,
wherein the transmission frequency is a frequency of current which flows through the coil.

3. The electronic device according to claim 2 , wherein the electronic device further includes:
a frequency-voltage convertor coupled to the energy collection circuit to detect the transmission frequency and generate a transmission voltage according to the transmission frequency.

4. The electronic device according to claim 3 , wherein the control unit stores a first reference digital code and a second reference digital code, the first reference digital code corresponds to the drive voltage, the second reference digital code corresponds to the transmission frequency, and the control unit further includes:
a first analog-digital convertor generating a first digital code according to the drive voltage; and
a second analog-digital convertor generating a second digital code according to the transmission voltage,
wherein the control unit compares the first digital code and the first reference digital code, and compares the second digital code and the second reference digital code.

5. The electronic device according to claim 3 , wherein the control unit stores a first reference digital code and a second reference digital code, the first reference digital code corresponds to the drive voltage, the second reference digital code corresponds the transmission frequency, and the control unit includes:
an analog-digital convertor generating a sample digital code according to the detection signal,
wherein the control unit compares the sample digital code and the first reference digital code, and compares the sample digital code and the second reference digital code, respectively.

6. The electronic device according to claim 1 , wherein the electronic device further includes:
a main circuit coupled to the rectifier circuit to receive the drive voltage; and
a communication interface coupled between the control unit and the main circuit, wherein the main circuit enables the control unit via the communication interface to compare the transmission frequency with the reference frequency and compare the drive voltage with the reference voltage.

7. A method of detecting efficiency of charging applied to an electronic device, wherein a coil of the electronic device receives an energy signal transmitted from a wireless charger base, the energy signal includes a transmission frequency, and a drive voltage is generated according to the energy signal by a rectifier circuit, the method comprising following steps:
detecting the transmission frequency and the drive voltage;
comparing the drive voltage and a reference voltage, and comparing the transmission frequency and reference frequency;
outputting position deviation information when the drive voltage is less than or equals to the reference voltage, or when the transmission frequency is less than or equals to the reference frequency;
dividing a voltage of the energy signal to generate a first voltage by a first voltage division circuit, wherein the first voltage division circuit is coupled to the coil;
dividing a voltage of the drive voltage to generate a second voltage by a second voltage division circuit, wherein the second voltage division circuit is coupled to the rectifier circuit; and
generating a detection signal according to the first voltage by a comparator, wherein the comparator is coupled between the first voltage division circuit and the second voltage division circuit, a voltage level of the detection signal changes with a level of the second voltage, and a frequency of the detection signal changes with a frequency of the first voltage.

8. The method according to claim 7 , wherein the step of detecting the transmission frequency and the drive voltage includes:
converting the transmission frequency to a transmission voltage by a frequency-voltage convertor;
generating a first digital code according to the drive voltage by a first analog-digital convertor; and
generating a second digital code according to the transmission voltage by a second analog-digital convertor.

9. The method according to claim 8 , wherein the step of comparing the drive voltage and the reference voltage includes:
comparing the first digital code and a first reference digital code corresponding to the reference voltage by a control unit; and
comparing the second digital code and a second reference digital code corresponding to the transmission frequency by the control unit.

Assignees

• Asustek Comp Inc

Inventors

• Huang Yi-Ming
• Tu Wei-Chen
• Tsai Ming-Ting
• Hung Hsiang-Jue

Classifications

• H02J50/90

  involving detection or optimisation of position, e.g. alignment · CPC title

• H02J50/80

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

• H02J50/10

  using inductive coupling · CPC title

• H02J7/42 Primary

  with electronic devices having internal batteries, e.g. mobile phones · CPC title

• H02J7/025 Primary

  Electricity · mapped topic