WO2018157371A1

WO2018157371A1 - Non-contact charging device

Info

Publication number: WO2018157371A1
Application number: PCT/CN2017/075552
Authority: WO
Inventors: 肖国文
Original assignee: 小天才科技有限公司
Priority date: 2017-03-03
Filing date: 2017-03-03
Publication date: 2018-09-07

Abstract

A non-contact charging device, comprising: a transmitting terminal (3) and a receiving terminal (2). The receiving terminal (2) is electrically connected with a device to be charged (1). The receiving terminal (2) comprises a constant current control circuit (201). When the voltage of a battery of the device to be charged (1) is less than a preset value, the receiving terminal (2) outputs a 0.7-1.2 C constant current to the device to be charged (1). Non-contact charging is carried out by the transmitting terminal (3) and the receiving terminal (2), so that the device to be charged (1) does not need a cable port, and the waterproof and dustproof effect can be achieved; the charging process has no cable limit, thereby preventing users from directly contacting a high-voltage power supply; and the constant current control circuit (201) of the receiving terminal (2) outputs the 0.7-1.2 C constant current to the device to be charged (1), and a low-voltage high-current charging mode can improve charging speed, so that the charging time of the device to be charged (1) is reduced.

Description

Non-contact charging device

Technical field

The present invention relates to the field of charging devices, and in particular, to a contactless charging device.

Background technique

At present, there are two ways to charge the smart wearable terminal: one is to use a cable to charge it by wire. The disadvantage is that the charging cable needs to be plugged in, and the charging is inconvenient. The smart wearable terminal needs to open a charging interface, which is difficult to achieve waterproof and dustproof. The other function is to wirelessly charge the smart wearable terminal by electromagnetic induction or coupling. The disadvantage is that the charging speed is slow and the power conversion efficiency is low.

technical problem

The object of the present invention is to provide a non-contact charging device. On the one hand, the device to be charged does not need to be provided with a cable socket, waterproof and dustproof, and there is no cable restriction in the charging process, thereby avoiding direct contact of the user with the high voltage power supply; The charging device can increase the charging speed and reduce the charging time of the device to be charged.

Technical solution

To this end, the present invention employs the following technical solutions:

A non-contact charging device includes: a transmitting end and a receiving end, wherein the receiving end is electrically connected to a device to be charged;

The receiving end includes a constant current control circuit. When the battery voltage of the device to be charged is less than a preset value, the receiving end outputs a constant current of 0.7 to 1.2 C to the device to be charged.

The transmitting end transmits energy to the receiving end by electromagnetic resonance or coil coupling through a preset transmission protocol.

Further, the transmitting end includes a fixed frequency circuit for maintaining a constant energy transmission frequency when transmitting energy to the receiving end, the energy transmission frequency being different from the frequency of the communication signal of the device to be charged.

The receiving end further includes a constant voltage control circuit for charging the charging device with a constant voltage when the battery voltage of the device to be charged reaches a preset value.

The transmitting end includes a transmitting coil having a diameter of 25 to 30 mm, an emission inductance of 506 uH, and a Q value of 60 to 80.

The receiving end comprises a receiving coil, the receiving coil has a diameter of 20~25mm, the receiving inductance is 15~19uH, and the Q value is 20~30.

Further, the transmitting end is provided with a first positioning device, and the receiving end is provided with a second positioning device; when charging, the first positioning device and the second positioning device cooperate to keep the transmitting coil and the receiving coil positive Pair and preset distance.

Further, the charging device further includes a power adapter, and the transmitting end is integrated with the power adapter or connected by a line.

Further, the receiving end is integrated with the device to be charged.

The positive electrode material of the battery of the device to be charged is a granular lithium cobalt oxide powder coated with a ceramic high voltage system, the electrolyte is a conventional PC and EMC is added with a conductive agent, and the negative electrode material is granular artificial graphite.

Beneficial effect

The beneficial effects of the invention are:

The invention performs non-contact charging by the transmitting end and the receiving end, so that the device to be charged does not need to be provided with a cable socket, and is more easily waterproof and dustproof, no cable limitation in the charging process, and the user is directly contacted with the high voltage power supply; the constant current of the receiving end The control circuit outputs a constant current of 0.7 to 1.2 C to the device to be charged, and the charging mode of the low voltage and high current can increase the charging speed and reduce the charging time of the device to be charged.

DRAWINGS

1 is a schematic structural view of a non-contact charging device provided by the present invention.

2 is a schematic diagram showing the circuit structure of a non-contact charging device provided by the present invention.

3 is a schematic structural view of a first positioning device and a second positioning device provided by the present invention.

In the figure: 1, the device to be charged; 2, the receiving end; 21, the second positioning device; 3, the transmitting end; 31, the first positioning device.

Embodiments of the invention

The technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only the present invention. Some embodiments, but not all of the embodiments.

1 is a schematic structural view of a non-contact charging device provided by the present invention. As shown in FIG. 1, a non-contact charging device is used in combination with a device requiring charging, including: a transmitting end 3 and a receiving end 2.

The transmitting end 3 transmits energy to the receiving end 2 in a electromagnetic resonance or coil coupling manner through a preset transmission protocol.

The device to be charged 1 includes a device such as a smart watch, a smart bracelet, a Bluetooth headset, a music player, a voice recorder, and the like. The receiving end 2 is electrically connected to the device to be charged 1; preferably, the receiving end 2 is integrated inside the device to be charged 1.

In this embodiment, the inductive charging is performed on the transmitting end and the receiving end, so that the device to be charged does not need to be provided with a cable socket, and the whole device is more easily waterproof and dustproof, and there is no cable restriction in the charging process, so as to avoid direct contact with the high voltage power supply by the user. It is also safe to charge in case of humidity.

The transmitting end 3 includes a transmitting coil. Preferably, the transmitting coil has a diameter of 25 to 30 mm, an emission inductance of 506 uH, and a Q value of 60 to 80.

The receiving end 2 includes a receiving coil. Preferably, the receiving coil has a diameter of 20 to 25 mm, a receiving inductance of 15 to 19 uH, and a Q value of 20 to 30.

2 is a schematic diagram showing the circuit structure of the non-contact charging device provided by the present invention. As shown in FIG. 2, the receiving end 2 includes a constant current control circuit 201 and a constant voltage control circuit 202.

The constant current control circuit 201 controls the receiving end 2 to output a constant current of 0.7 to 1.2 C to the device to be charged 1 when the battery voltage of the device to be charged 1 is less than a preset value (C is the battery capacity of the device to be charged) .

The constant voltage control circuit 202 controls the receiving end 2 to charge the charging device 1 with a constant voltage after the battery voltage of the device 1 to be charged reaches a preset value.

The preset value is set according to the rated voltage of the battery of the device 1 to be charged, and is generally 70% to 85% of the rated voltage. For example, when the rated voltage of the battery to be charged 1 is 5V, the preset value is set to 4.2V, and when the battery voltage is less than 4.2V, constant current charging is performed, and after reaching 4.2V, it is switched to constant voltage charging.

In this embodiment, the constant current control circuit of the receiving end outputs a constant current of 0.7~1.2C to the device to be charged, and is charged by a low voltage and high current charging mode, which can improve the charging speed and reduce the charging time; After the battery voltage of the device to be charged reaches the preset value, the charging device is charged at a constant voltage, and the charging current is reduced, which can effectively prevent overcharging and battery temperature from being too high, and has a remarkable effect on extending battery life and ensuring charging safety. .

The device to be charged 1 includes a charging protection circuit 101 for performing over-voltage and over-current protection, over-temperature protection, over-charge protection, over-discharge protection, and the like on the battery. The charging protection circuit 101 is easily obtained from the prior art. .

The positive electrode material of the battery of the device to be charged 1 is granular lithium cobalt oxide powder coated with a ceramic high voltage system, the electrolyte is a conventional PC and EMC is added with a conductive agent, and the negative electrode material is granular artificial graphite. In the above-mentioned low voltage and high current fast charging environment, the material system of such a battery ensures safe charging and less battery capacity loss.

The transmitting end 3 includes a fixed frequency circuit 301 for maintaining a constant energy transmission frequency when transmitting energy to the receiving end, the energy transmission frequency being different from the frequency of the communication signal of the device to be charged.

The fixed frequency circuit 301 can be implemented by adding a filtering component in a targeted manner at the transmitting end, and the interference is eliminated from the communication signal. In addition, the effect of preventing charging interference communication can be achieved by adding a shield cover at the transmitting end to shield the energy transmission frequency of the same frequency as the communication signal so as not to leak.

The transmitting end 3 further includes a DC-AC conversion circuit, and the DC-AC conversion circuit realizes DC-AC conversion through the driving circuit and the coil, thereby increasing the current withstand capability of the driving circuit and the coil, and increasing the transmission power. Correspondingly, the receiving end 2 realizes AC-DC conversion through the coil and the rectifying and stabilizing circuit, and increases the current withstand capability of the coil and the rectifying and stabilizing circuit, thereby increasing the receiving power. Increasing the transmission power and receiving power is beneficial to increase the charging speed and save charging time.

Further, the charging device further includes a power adapter 4, which is integrated with the power adapter 4 or connected by a line.

As a modification of the embodiment, as shown in FIG. 3, the transmitting end 3 is provided with a first positioning device 31, the receiving end 2 is provided with a second positioning device 21; when charging, the first positioning device 31 and the second The positioning device 21 cooperates such that the transmitting coil and the receiving coil are kept in a right direction and a preset distance. 3 is a schematic structural diagram of a first positioning device and a second positioning device provided by the present invention. Taking a smart watch as an example, the receiving end 2 is integrated with the device to be charged 1 (ie, a smart watch), and when charging, The smart watch is placed on the transmitting end 3, so that the first positioning device 31 and the second positioning device 21 are sleeved.

The transmitting coil and the receiving coil are directly facing each other, and the distance is 2~4 mm, so that the energy transmission efficiency can be significantly improved, reaching more than 70%; the energy conversion rate is high, the energy is saved, and the charging speed is faster.

In addition, the first positioning device 31 and the second positioning device 21 may also be magnetic components integrated into the interior of the transmitting end 3 and the receiving end 2 respectively; when the device 1 to be charged equipped with the receiving end 2 is placed on the transmitting end 3, The first positioning device 31 and the second positioning device 21 are magnetically attracted together such that the transmitting coil and the receiving coil are kept in a right direction and a preset distance.

The technical principles of the present invention have been described above in connection with specific embodiments. The descriptions are merely illustrative of the principles of the invention and are not to be construed as limiting the scope of the invention. Based on the explanation herein, those skilled in the art can devise various other embodiments of the present invention without departing from the scope of the invention.

Claims

A non-contact charging device, comprising: a transmitting end and a receiving end, wherein the receiving end is electrically connected to a device to be charged;

The receiving end includes a constant current control circuit. When the battery voltage of the device to be charged is less than a preset value, the receiving end outputs a constant current of 0.7 to 1.2 C to the device to be charged.
The charging device according to claim 1, wherein the transmitting end transmits energy to the receiving end in a electromagnetic resonance or coil coupling manner through a preset transmission protocol.
The charging device according to claim 2, wherein the transmitting end comprises a fixed frequency circuit for maintaining a constant energy transmission frequency when transmitting energy to the receiving end, the energy transmission frequency and a communication signal of the device to be charged The frequency is not the same.
The charging device according to claim 1, wherein the receiving end further comprises a constant voltage control circuit for charging the charging device with a constant voltage when the battery voltage of the device to be charged reaches a preset value.
The charging device according to claim 1, wherein the transmitting end comprises a transmitting coil having a diameter of 25 to 30 mm, an emission inductance of 506 uH, and a Q value of 60 to 80.
The charging device according to claim 5, wherein the receiving end comprises a receiving coil having a diameter of 20 to 25 mm, a receiving inductance of 15 to 19 uH, and a Q value of 20 to 30.
The charging device according to claim 6, wherein the transmitting end is provided with a first positioning device, and the receiving end is provided with a second positioning device; when charging, the first positioning device and the second positioning device The cooperation is such that the transmitting coil and the receiving coil are kept in a right direction and a preset distance.
The charging device according to claim 1, wherein said charging device further comprises a power adapter, said transmitter being integrated with said power adapter or connected by a line.
A charging device according to claim 1, wherein said receiving end is integrated with a device to be charged.
The charging device according to claim 1, wherein the positive electrode material of the battery of the device to be charged is a granular lithium cobalt oxide powder coated with a high voltage system, and the electrolyte is added to a conventional PC and EMC. The negative electrode material is granular artificial graphite.