WO2012092782A1

WO2012092782A1 - Wireless charger

Info

Publication number: WO2012092782A1
Application number: PCT/CN2011/079549
Authority: WO
Inventors: 李晓刚; 刘特广
Original assignee: 深圳市航嘉驰源电气股份有限公司
Priority date: 2011-01-04
Filing date: 2011-09-09
Publication date: 2012-07-12
Also published as: CN201928065U

Abstract

A wireless charger (1) includes a coil (10) and a charging converting circuit (20) connected to the coil (10). The coil (10) is integrated into a battery (2) and capable of receiving electromagnetic energy. The received electromagnetic energy is converted into electrical energy by the charging converting circuit (20) and then transmitted to the battery (2). By way of integrating the coil (10) into the battery (2), it is not required to change the existing structure of an electronic device, but only the structure of the battery (2) in the electronic device. This saves costs and facilitates the popularization of wireless charging.

Description

Wireless charger

Technical field

The utility model relates to the field of electrical appliances, in particular to a wireless charger.

Background technique

It is well known that battery charging of various portable electronic devices such as mobile phones, personal electronic assistants (PADs), MP3s, etc. is a headache. In addition to the need to use different chargers for different electronic products, it is also inconvenient to use when looking for a suitable socket for charging. Therefore, a novel device called a "wireless battery charging platform", that is, a wireless charger, has been digitally displayed on the market. The shape of the wireless charger is the same as that of the induction cooktop. The internal setting is used to generate the inductive coupling component of the low-frequency electromagnetic field. The inductive energy that can sense the low-frequency electromagnetic wave is set on the electronic device to be charged, and converted into electric energy. Charging process.

As shown in Fig. 1, for the conventional charging circuit structure, the wireless charger is "deformed" on the basis of the conventional one, and the part A (including the transformer coil on the primary side) is made into a charging platform, and the part B (including the time) The transformer coil on the stage side is integrated into various electronic devices. Therefore, when the electronic device is placed on the charging platform, it is equivalent to placing A and B close together, and the two can be regarded as a common charger that is recombined.

The integration of the B part of the existing wireless charger can be achieved by various methods, for example:

First, the integration of the B part into the electronic device, so that the electronic device needs to be greatly modified, and must also be negotiated with the original manufacturer of the electronic device, which is not conducive to the promotion and application of the wireless charger.

Secondly, the part B is integrated into the outer casing of the electronic device. When charging is required, the outer casing is sleeved on the electronic device and connected to the battery of the electronic device, and wireless charging can also be realized. However, this method also requires an additional "shell" for the electronic device, which is not conducive to the promotion and application of the wireless charger.

Utility model content

The main purpose of the utility model is to provide a wireless charger, which aims to reduce the production cost and is advantageous for popularization and application.

The wireless charger provided by the utility model comprises a coil and a charging conversion circuit connected to the coil. The coil is integrated on the battery, and the coil receives electromagnetic energy and converts it into electric energy through a charging conversion circuit to be transmitted to the battery.

Preferably, the coil described above is integrated in a cross-sectional plane of the battery or on the side of the battery.

Preferably, the above-described charge conversion circuit is disposed in the battery.

Preferably, the above charging conversion circuit is disposed in the electronic device.

Preferably, the wireless charger further includes a status indication circuit connected to the charge conversion circuit, disposed in the battery to display a state of charge of the battery.

Preferably, the above charging conversion circuit includes a rectifier circuit, a filter circuit, and a DC-DC conversion circuit.

Preferably, the wireless charger further includes a protection circuit, the protection circuit is connected to the charging conversion circuit, and collects an output current of the charging conversion circuit, and when the output current is greater than the preset current value, the coil and the charging conversion circuit are disconnected. Connection.

The utility model integrates the coil in the wireless charger into the battery, so that the structure of the original electronic device does not need to be changed, and only by changing the structure of the battery in the electronic device, not only the cost is saved, but also the wireless charger is more favorable for promotion.

DRAWINGS

1 is a schematic structural view of a conventional charging circuit in the prior art;

2 is a schematic structural view of an embodiment of a wireless charger of the present invention;

3 is a schematic structural view of an embodiment of a wireless charger of the present invention in which a coil is integrated on a battery;

4 is a schematic structural view showing another embodiment of a coil integrated in a battery in the wireless charger of the present invention;

5 is a schematic structural view of another embodiment of a wireless charger of the present invention;

6 is a schematic structural view of still another embodiment of the wireless charger of the present invention.

The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.

detailed description

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to FIG. 2, a schematic structural diagram of an embodiment of a wireless charger is presented.

The wireless charger 1 of the present embodiment includes a coil 10 and a charging conversion circuit 20 connected to the coil 10. The coil 10 is integrated on the battery 2, and the coil 10 can receive electromagnetic energy and convert it into electric energy through the charging conversion circuit 20 to transmit To battery 2.

The coil 10 described above is a secondary coil that is integrated on the battery. Therefore, when the battery of the integrated coil is placed on the charging platform integrated with the primary coil, the electromagnetic energy generated by the charging platform is received by the coil 10 on the battery, so that the electromagnetic energy can be converted into electric energy through the charging conversion circuit 20, thereby completing Charge the battery.

Referring to Figures 3 and 4, the coil 10 described above may be integrated on a cross-sectional plane of the battery or on the side of the battery. Because the output current of the charger is relatively small, usually several hundred milliamperes, the wire diameter of the coil 10 can be very small. Generally, a current of 1000 mA can be passed through a wire of 0.1 mm, so the coil 10 with a wire diameter of 0.1 mm is completely Can meet the charging needs. The widely used lithium battery has a thickness of 2-3 mm, so the coil with a wire diameter of 0.1 mm is integrated into a common lithium battery, and the volume of the battery is not affected.

The charge conversion circuit 20 described above may include a rectifier circuit, a filter circuit, and a DC-DC conversion circuit. The charge conversion circuit 20 can be disposed in the electronic device or directly in the battery. When the charging conversion circuit 20 is disposed in the electronic device, the charging conversion circuit 20 can be disposed without additional space, and the charging process of the battery can be completed by using the charging conversion circuit 20 in the electronic device. When the charge conversion circuit 20 is disposed in the battery, although the battery needs to add a part of space to accommodate the charge conversion circuit 20, since the charge conversion circuit 20 can be a small integrated circuit, the space occupied by the battery is small, and it is not at all Affecting the use volume of the battery, and directly setting the charging conversion circuit 20 in the battery, the battery can be separately placed on the charging platform for charging, and the battery is no longer needed to be charged in the electronic device, which is greatly facilitated. User's use.

Referring to FIG. 5, a schematic structural diagram of another embodiment of a wireless charger is proposed.

Based on the above embodiment, the wireless charger of the embodiment further includes a state indicating circuit 30 connected to the charging conversion circuit 20 described above. The status indicating circuit 30 can be disposed within the battery to display the state of charge of the battery. The display form of the status indicating circuit 30 may be an LED light display or a speaker type sound display.

In the wireless charger of the embodiment, when the state indicating circuit 30 is set in the battery, so that the battery is placed on the charging platform for charging, the state indicating circuit 30 can know the charging condition of the battery, so that the use of the wireless charger is more convenient. .

Referring to Figure 6, a schematic structural diagram of another embodiment of a wireless charger is presented.

Based on the above embodiment, the wireless charger of the embodiment further includes a protection circuit 40 connected to the charging conversion circuit 20 for collecting the output current of the charging conversion circuit 20, and comparing the output current with the pre- The current is set, and if the output current exceeds the preset current value, the connection of the coil 10 to the charge conversion circuit 20 is broken.

In the wireless charger of the embodiment, the protection circuit 40 is disposed in the battery, so that the charging current can be monitored at any time during the process of charging the battery, thereby preventing the charging current from being excessive and damaging the battery.

The above is only a preferred embodiment of the present invention, and thus does not limit the scope of the patent of the present invention, and the equivalent structure made by the specification and the drawings of the present invention is directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims

A wireless charger includes a coil and a charging conversion circuit connected to the coil, wherein the coil is integrated on a battery, the coil receives electromagnetic energy, and converts it into electric energy through a charging conversion circuit, and transmits the battery to the battery .
The wireless charger of claim 1 wherein said coil is integrated on a cross-sectional plane of the battery or on a side of the battery.
The wireless charger of claim 2 wherein said charge conversion circuit is disposed within a battery.
The wireless charger of claim 1 wherein said charge conversion circuit is disposed within an electronic device.
The wireless charger according to any one of claims 1 to 4, further comprising a state indicating circuit connected to the charge conversion circuit, disposed in the battery to display a state of charge of the battery.
The wireless charger according to any one of claims 1 to 4, wherein the charge conversion circuit comprises a rectifier circuit, a filter circuit, and a DC-DC conversion circuit.
The wireless charger according to any one of claims 1 to 4, further comprising a protection circuit connected to the charge conversion circuit, collecting an output current of the charge conversion circuit, and at the output current When the value is greater than the preset current value, the connection between the coil and the charge conversion circuit is disconnected.