Wireless charging system and charging method thereof

• US 20110163713A1
• Filed: 04/30/2010
• Published: 07/07/2011
• Est. Priority Date: 01/06/2010
• Status: Abandoned Application

• Current Assignee: KYE Systems Corporation
• Original Assignee: KYE Systems Corporation
• Inventors: MAU, Ruey-Cheng, WANG, Yu-Chi
• Application Number:
  US12/662,728
• Publication Number:
  US 20110163713A1
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/00045 Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source

Abstract

A wireless charging system and charging method thereof allows a wireless charging stand to wireless charge an electronic device through electromagnetic induction. The wireless charging stand periodically activates to determine if the electronic device enters a predetermined range. Once the electronic device is sufficiently close, a transmission coil of the wireless charging stand transmits electromagnetic waves induced by a reception coil of the electronic device to generate current. The current is intermittently connected to a load by activating and deactivating a switch based on a charge time sequence to correspondingly change current consumption of the transmission coil. The wireless charging stand determines if the time sequence associated with current consumption is identical to a charge identification time sequence. The transmission coil continues charging if positive, and stops charging if negative, thereby preventing a wireless charging stand and electronic device having different voltage specification from being damaged to ensure operational safety.

Claims

1. A wireless charging system, comprising:

a wireless charging stand having;

a transmission coil;

a current detector;

a transmission circuit having an output terminal connected with the transmission coil to drive the transmission coil to transmit an electromagnetic wave; and

a transmission processor having;

an input terminal connected with the transmission coil through the current detector for detecting a current consumption condition of the transmission coil;

an output terminal connected with the input terminal of the transmission circuit for controlling the transmission circuit;

a charge identification time sequence;

a saturated identification time sequence; and

a load detection process executed by the transmission processor to determine the current consumption condition of the transmission coil with the charge identification time sequence and the saturated identification time sequence; and

an electronic device having;

a load; and

a power supply module having;

a reception coil generating a current induced from the electromagnetic wave;

a rectifier;

a rechargeable battery;

a switch connected between an output terminal of the rectifier and the load;

a charger connected with the rechargeable battery to charge the rechargeable battery with the current generated by the reception coil and connected with the reception coil through the rectifier; and

a reception processor having;

a charge time sequence;

a saturated time sequence;

an activation scheduling process executed by the reception processor to activate or deactivate the switch according to the charge time sequence or a saturated time sequence before or after the rechargeable battery has a saturated power storage.

2. The wireless charging system as claimed in claim 1, wherein the transmission circuit of the wireless charging stand is a pulse width modulation controller.

3. The wireless charging system as claimed in claim 1, wherein each of the transmission processor and the reception processor is composed of a micro-controller unit (MCU).

4. A charging method performed by the wireless charging stand as claimed in claim 1, comprising steps of:

generating an activation signal;

receiving a current consumption signal of the transmission coil;

determining if a time sequence with which the current consumption signal varies is the same as the charge identification time sequence; and

starting charging if positive and stopping charging if negative.

5. A charging method performed by the wireless charging stand as claimed in claim 2, comprising steps of:

generating an activation signal;

receiving a current consumption signal of the transmission coil;

determining if a time sequence with which the current consumption signal varies is the same as the charge identification time sequence; and

starting charging if positive and stopping charging if negative.

6. A charging method performed by the wireless charging stand as claimed in claim 3, comprising steps of:

generating an activation signal;

receiving a current consumption signal of the transmission coil;

determining if a time sequence with which the current consumption signal varies is the same as the charge identification time sequence; and

starting charging if positive and stopping charging if negative.

7. The charging method as claimed in claim 4, wherein the activation signal is an electromagnetic wave transmitted from the transmission coil.

8. The charging method as claimed in claim 5, wherein the activation signal is an electromagnetic wave transmitted from the transmission coil.

9. The charging method as claimed in claim 6, wherein the activation signal is an electromagnetic wave transmitted from the transmission coil.

10. A charging method employed by the electronic device as claimed in claim 1, comprising steps of:

sensing an electromagnetic wave transmitted from the wireless charging stand;

varying the load with the charge time sequence; and

charging the rechargeable battery with the received electromagnetic wave.

11. A charging method employed by the electronic device as claimed in claim 2, comprising steps of:

sensing an electromagnetic wave transmitted from the wireless charging stand;

varying the load with the charge time sequence; and

charging the rechargeable battery with the received electromagnetic wave.

12. A charging method employed by the electronic device as claimed in claim 3, comprising steps of:

sensing an electromagnetic wave transmitted from the wireless charging stand;

varying the load with the charge time sequence; and

charging the rechargeable battery with the received electromagnetic wave.

13. The charging method as claimed in claim 10, wherein before varying the load with the charge time sequence, the electronic device first executes steps of:

determining if the a power capacity of the rechargeable battery is saturated;

stopping activating or deactivating the switch if positive; and

varying the load with the charge time sequence if negative.

14. The charging method as claimed in claim 11, wherein before varying the load with the charge time sequence, the electronic device first executes steps of:

determining if the a power capacity of the rechargeable battery is saturated;

stopping activating or deactivating the switch if positive; and

varying the load with the charge time sequence if negative.

15. The charging method as claimed in claim 12, wherein before varying the load with the charge time sequence, the electronic device first executes steps of:

determining if the a power capacity of the rechargeable battery is saturated;

stopping activating or deactivating the switch if positive; and

varying the load with the charge time sequence if negative.

16. A charging method, comprising steps of:

providing a wireless charging stand to transmit an electromagnetic wave;

providing an electronic device to sense the electromagnetic wave and generate a load varying with a charge time sequence;

determining if a time sequence with which a current consumption signal varies of the wireless charging stand is the same as a charge identification time sequence; and

enabling the wireless charging stand to charge a rechargeable battery of the electronic device if positive.

17. The charging method as claimed in claim 16, further comprising steps of:

providing the wireless charging stand to periodically transmit the electromagnetic wave and the electronic device to periodically sense the electromagnetic wave;

using the electronic device to detect if a power capacity of the rechargeable battery is saturated;

enabling the electronic device to stop generating the load varying with the charge time sequence and enabling the wireless charging stand to stop charging the electronic device, if positive.

18. The charging method as claimed in claim 17, further comprising steps of:

enabling the electronic device to sense the electromagnetic wave again and generate the load varying with the charge time sequence if the power capacity of the rechargeable battery is not saturated;

enabling the wireless charging stand to determine again if a time sequence with which the current consumption signal varies is the same as the charge identification time sequence; and

enabling the wireless charging stand to charge the rechargeable battery if positive.

19. The charging method as claimed in claim 16, wherein when the power capacity of the rechargeable battery is saturated, the electronic device generates the load varying with a saturated time sequence, the wireless charging stand detects the variation of the load and stops transmitting the electromagnetic wave, and the electronic device stops generating the load varying with the charge time sequence.