WIRELESS CHARGING TRANSCEIVER DEVICE AND WIRELESS CHARGING CONTROL METHOD

• US 20160261134A1
• Filed: 07/28/2015
• Published: 09/08/2016
• Est. Priority Date: 03/04/2015
• Status: Active Grant

• Current Assignee: Wistron Corporation
• Original Assignee: Wistron Corporation
• Inventors: WU, Wen-Chin, KAO, Yi-Sheng, CHANG, Yao-Tsung
• Granted Patent: US 9,647,484 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/001 Energy harvesting or scavenging
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/32 for charging batteries from a charging set comprising a non-electric prime mover rotating at constant speed

Abstract

A wireless charging transceiver device includes an energy storage module, a coil, a switch module, a rectifier circuit, and a resonant circuit. The coil is used to induce an external magnetic field or receive an external charging signal, and is used to transmit a wireless charging signal. The switch module is used to be coupled between the energy storage module and the coil through a first or second electrical path. The rectifier circuit is coupled between the energy storage module and the switch module, and is sited in the first electrical path, and rectifying a first inducing current which is induced from the external magnetic field in a first mode. The resonant circuit is coupled between the energy storage module and the switch module, and is sited in the second electrical path.

Claims

1. A wireless charging transceiver device, comprising:

an energy storage module;

a coil for inducing an external magnetic field or receiving an external charging signal, and sending a wireless charging signal;

a switch module for coupling the energy storage module to the coil with a first electrical path or a second electrical path selectively;

a rectifier circuit in the first electrical path, and coupled between the energy storage module and the switch module, for rectifying a first inducing current induced from the first electrical path by the external magnetic field in a first mode; and

a resonant circuit in the second electrical path, and coupled between the energy storage module and the switch module, wherein the wireless charging signal is sent to the coil through the second electrical path in a second mode and a second inducing current is induced in the second electrical path according to the external charging signal in a third mode;

wherein the first inducing current and the second inducing current are charging currents recharged to the energy storage module.

2. The device of claim 1, wherein the wireless charging transceiver device further comprises a magnetic body near the coil, and the external magnetic field is generated according to the movement of the magnetic body respect to the coil, and the first inducing current is generated when the coil induces the external magnetic field.

3. The device of claim 2, wherein in the second mode or the third mode, the magnetic body is locked and is not relatively movable respect to the coil.

4. The device of claim 2, wherein the wireless charging transceiver device further comprises an elastic unit connected to the magnetic body, and the elastic unit is for storing energy when shaking the wireless charging transceiver device for moving the magnetic body respect to the coil, and for releasing temporarily stored energy when the wireless charging transceiver device stops shaking.

5. The device of claim 2, wherein the wireless charging transceiver device further comprises a first detecting module for detecting whether the magnetic body moves respect to the coil and for generating a first detecting signal accordingly, and the first detecting signal is for indicating the movement range when the magnetic body moves respect to the coil.

6. The device of claim 5, wherein the wireless charging transceiver device further comprises a control module coupled between the first detecting module and the switch module, and the control module is for determining whether the first inducing current reaches an energy conversion efficiency according to the first detecting signal to selectively control the switch module to be coupled between the energy storage module and the coil through the first electrical path.

7. The device of claim 6, wherein the wireless charging transceiver device further comprises a second detecting module coupled between the resonant circuit and the control module, and the second detecting module is for detecting whether the resonant circuit resonates with the coil and generating a second detecting signal accordingly, and the second detecting signal is for indicating a resonant frequency of the resonant circuit.

8. A wireless charging control method for a wireless charging transceiver device, the wireless charging transceiver device having a magnetic body, a coil, a resonant circuit, and an energy storage module, the magnetic body near the coil, the resonant circuit coupled to the energy storage module, the coil selectively coupled to the resonant circuit, the method comprising:

determining whether the magnetic body moves respect to the coil;

when the magnetic body moves respect to the coil, a first inducing current is converted to direct current (DC) and recharged to the energy storage module, wherein the first inducing current is induced when the coil induces an external magnetic field, and the external magnetic field is generated according to the movement of the magnetic body respect to the coil;

when the magnetic body does not move respect to the coil, further determining whether the resonant circuit resonates with the coil; and

when the resonant circuit resonates with the coil, the wireless charging transceiver device receiving an external charging signal or sending a wireless charging signal, wherein the external charging signal is generated by a wireless charging transmission device, and the wireless charging transceiver device induces a second inducing current when the wireless charging transceiver device receives the external charging signal, and the wireless charging transceiver device converts the second inducing current to DC and recharges the second inducing current to the energy storage module, and a wireless charging receiving device performs wireless charging through the wireless charging signal when the wireless charging transceiver device sends the wireless charging signal.

9. The method of claim 8, wherein when the magnetic body moves respect to the coil, whether the first inducing current induced by the coil reaches an energy conversion efficiency is determined to selectively convert the first inducing current to DC and recharge the first inducing current to the energy storage module.

10. The method of claim 9, wherein when the first inducing current induced by the coil reaches the energy conversion efficiency, the first inducing current is converted to DC and recharged to the energy storage module, and when the first inducing current induced by the coil does not reach the energy conversion efficiency, the step of determining whether the magnetic body moves respect to the coil is executed again.

11. The method of claim 8, wherein when the resonant circuit does not resonate with the coil, the step of determining whether the magnetic body moves respect to the coil is executed again.

12. A wireless charging control method for a wireless charging transceiver device, the wireless charging transceiver device having a magnetic body, a coil, a resonant circuit, and an energy storage module, the magnetic body near the coil, the resonant circuit coupled to the energy storage module, the coil selectively coupled to the resonant circuit, the method comprising:

determining whether the resonant circuit resonates with the coil;

when the resonant circuit resonates with the coil, the wireless charging transceiver device receiving an external charging signal or sending a wireless charging signal, wherein the external charging signal is generated by a wireless charging transmission device, and the wireless charging transmission device generates a first inducing current when receiving the external charging signal, and the wireless charging transmission device converts the first inducing current to DC and recharges the first inducing current to the energy storage module, and a wireless charging receiving device performs wireless charging by inducing the wireless charging signal when the wireless charging transceiver device sends the wireless charging signal; and

when the resonant circuit does not resonate with the coil, further determining whether the magnetic body moves respect to the coil to selectively convert a second inducing current to DC and recharge the second inducing current to the energy storage module, wherein the second inducing current is induced when the coil induces an external magnetic field, and the external magnetic field is generated by the movement of the magnetic body respect to the coil.

13. The method of claim 12, wherein when the magnetic body moves respect to the coil, whether the second inducing current induced by the coil reaches an energy conversion efficiency is further determined to selectively convert the second inducing current to DC and recharge the second inducing current to the energy storage module.

14. The method of claim 13, wherein when the second inducing current induced by the coil reaches the energy conversion efficiency, the second inducing current is converted to DC and recharged to the energy storage module, and when the second inducing current induced by the coil does not reach the energy conversion efficiency, the step of determining whether the resonant circuit resonates with the coil is executed again.

15. The method of claim 13, wherein when the magnetic body does not move respect to the coil, the step of determining whether the resonant circuit resonates with the coil is executed again.