Wireless charger and wireless charging method thereof

• US 8,120,317 B2
• Filed: 08/14/2009
• Issued: 02/21/2012
• Est. Priority Date: 04/09/2009
• Status: Expired due to Fees

• Current Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Inventors: Sip, Kim-Yeung
• Primary Examiner(s): Ramadan, Ramy
• Application Number:
  US12/541,177
• Publication Number:
  US 20100259215A1
• Time in Patent Office: 921 Days
• Field of Search: 320/108, 320/114
• 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 7/0042 characterised by the mechanical construction
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence

Abstract

A wireless charger for charging an electronic device includes a holder with a primary coil and a number of holding coils fixed thereon and a resilient member sleeved thereon. The wireless charger further includes a sensing module, a storing module, a comparing module and an adjusting module. The sensing module detects each current value of the holding coils when the wireless charger is powered on. The storing module stores each current value of the holding coils from the sensing module and predetermines a reference current value for each holding coil. The comparing module compares the current value with the reference current value to determine whether the current value equals to the reference current value. The adjusting module changes the current values to the reference current values when the current value is not equal to the reference current value to adjust an angle of the secondary coil relative to the primary coil.

Claims

1. A wireless charger for charging an electronic device with a secondary coil and a plurality of metal blocks, the wireless charger comprising:

a holder with a primary coil electromagnetically coupled to the secondary coil of the electronic device, and a plurality of holding coils fixed thereon corresponding to the metal blocks;

a resilient member deformably sleeved on the holder;

a sensing module configured for detecting a current value of each holding coil when the wireless charger is power on;

a storing module configured for storing each current value of the holding coils from the sensing module and predetermining a reference current value for each holding coil;

a comparing module configured for comparing the current value of the holding coil with the reference current value to determine whether the current value of the holding coil equals the reference current value; and

an adjusting module configured for changing the current value to the reference current value when the current value is not equal to the reference current value to adjust an angle of the secondary coil of the electronic device relative to the primary coil of the wireless charger, thereby the electronic device can be adjusted to face the wireless charger coaxially when charging.

2. The wireless charger in claim 1, wherein both the holder and the resilient member are cylindrically shaped.

3. The wireless charger in claim 1, wherein the holder comprises a base and a convex platform formed on the base, the base defines a receiving cavity thereof, and the primary coil is fixed on the top surface of the convex platform facing to the resilient member.

4. The wireless charger in claim 3, wherein a step is formed between the convex platform and the base and the step defines a plurality of holes thereon, the holding coils are received in the holes around the convex platform correspondingly.

5. The wireless charger in claim 1, wherein the number of the holding coils is four.

6. The wireless charger in claim 1, wherein the resilient member is made of elastic material.

7. The wireless charger in claim 1, wherein a plurality of resilient threads are formed on the side surface of the resilient member.

8. The wireless charger in claim 1, wherein the resilient member comprises an end surface away from the base, the distance between the end surface and the upper surface of the base is larger than the height of the holding coils relative to the upper surface of the base.

9. The wireless charger in claim 1, wherein the storing module further stores a plurality of product models for a plurality of electronic devices, and each product model corresponds to one of the reference current values.

10. The wireless charger in claim 1, wherein the electronic devices connects to the wireless charger via a data line for transmitting and receiving a data therebetween.

11. The wireless charger in claim 1, wherein if the current value of the holding coil equals the reference current value, the wireless charger continues charging the electronic device, and the comparing module does not signal the adjusting module to initiate a connection to the comparing module.

12. The wireless charger in claim 3, wherein the adjusting module comprises a plurality of adjusting circuits for adjusting the current value of the holding coils to the reference current value, and the adjusting circuits are received in the receiving cavity.

13. The wireless charger in claim 12, wherein each adjusting circuit connects to an alternating current (AC) power supply and comprises an alternating current value/direct current value (A/D) unit and a variable resistance connected in series, the A/D unit is configured for transforming an alternating current value in the holding coils to a direct current value to attract the metal blocks, and the variable resistance is configured for changing the current value of the holding coils by changing the resistance of the adjusting circuit.

14. A charging method for a wireless charger which comprises a holder with a primary coil and a number of holding coils fixed thereon and a resilient member sleeve on the holder to charge an electronic device with a secondary coil and a plurality of metal blocks comprising the steps of:

detecting the current value of each holding coil when the wireless charger is powered on;

storing each current value of the holding coils and predetermining a reference current value for each holding coil;

comparing the current value of the holding coil with the reference current value to determine whether the current value of the holding coil is equal to the reference current value;

if the current value of the holding coil is not equal to the reference current value, changing the current value to the reference current value, to adjust an angle of the secondary coil of the electronic device relative to the primary coil of the wireless charger, thereby the electronic device can be adjusted to face the wireless charger coaxially to charge;

if the current value of the holding coil is equal to the reference current value, continue charging the electronic device.