TWM561357U - Wireless charging system, transmitting device and receiving device - Google Patents

Abstract

The present invention discloses a wireless charging system including a transmitting device and a receiving device. The driving circuit of the transmitting device receives the DC input power and the pulse width modulation signal, converts the DC input power into an AC power source, and transmits the signal to the primary coil. The secondary coil of the receiving device converts the alternating current power into a direct current charging power source through the rectifying and stabilizing circuit to charge the rechargeable battery. The receiving end controller of the receiving device receives the power supply status signal and the charging status signal, correspondingly generates a return signal, and modulates the secondary signal through the modulation circuit, and then transmits the return signal to the primary coil through the demodulation circuit of the transmitting device. After decoding, an input signal is formed. The transmitting end controller generates a pulse width modulation signal according to the input signal, transmits the signal to the driving circuit, and adjusts the wireless charging power of the transmitting device.

Description

Wireless charging system, transmitting device and receiving device

The present invention relates to a wireless charging system and a transmitting device and a receiving device therefor, and more particularly to a wireless charging capable of wirelessly charging between a transmitting device and a receiving device, and returning the charging state by the receiving device to adjust the power supply of the transmitting device. system.

At present, various hand-held electronic devices, such as electric toothbrushes, electric razors, wireless microphones, etc., often use rechargeable batteries to provide power for electronic devices, thereby increasing the convenience of use. The method of charging a rechargeable battery has also evolved from a metal electrode contact to a wireless charging that does not require contact. However, today's wireless charging methods still have various limitations in use. Taking the existing electric toothbrush as an example, the wireless charging structure uses the principle of a transformer, and the magnetic core needs to be inserted into the secondary coil. Most of the products are provided with a groove at the bottom for the magnetic core to be inserted, and the charging structure cannot be set. On the side. Even if there is a wireless charging structure that does not require a groove, the three-dimensional shape of the coil can only be placed on the bottom surface of the device, which causes a great limitation in product design freedom.

In addition, most of the charging current provided by the charging stand is not immediately adjustable when the charging state of the electronic device is changed, and the error formed during the manufacturing of the same product component cannot be finely adjusted to provide the most appropriate charging current. Therefore, the existing wireless charging still has room for improvement in charging efficiency.

As mentioned above, the creators of this creation think about and design wireless charging systems and devices that can wirelessly charge and simultaneously adjust the amount of charging current, in order to improve the lack of conventional technology, thereby enhancing the implementation and utilization of the industry.

In view of the above-mentioned problems of the prior art, one of the objects of the present invention is to provide a wireless charging system, a transmitting device and a receiving device thereof, with an innovative coil arrangement and a corresponding circuit structure, so that the device has a larger design. The flexibility, and by adjusting the supply current by returning the charging and power supply status, further improve the wireless charging efficiency.

In accordance with the purpose of this creation, a wireless charging system is proposed that includes a transmitting device and a receiving device that is provided in response to the transmitting device. The transmitting device comprises a driving circuit, a primary coil, a demodulating circuit and a transmitting end controller. The driving circuit is connected to the power supply device, receives the DC input power, and receives a Pulse Width Modulation (PWM) signal to convert the DC input power into an AC power source. The primary coil is connected to the drive circuit and receives AC power. The demodulation circuit is connected to the primary coil, and the return signal transmitted by the primary coil is decoded to form an input signal. The transmitting end controller is connected to the demodulation circuit and the driving circuit, receives the input signal and generates a pulse width modulation signal correspondingly, and transmits the signal to the driving circuit. The receiving device includes a secondary coil, a rectifying and stabilizing circuit, a receiving end controller, and a modulating circuit. The secondary coil is electromagnetically coupled to the primary coil and receives AC power. The rectifying and stabilizing circuit is connected to the secondary coil to convert the AC power into a DC charging power source, and the DC charging power source charges the rechargeable battery. The receiving end controller is connected to the rectifying and regulating circuit and the rechargeable battery, and receives the power supply status signal and the charging status signal and generates a return signal correspondingly. The modulation circuit is connected to the receiving end controller and the secondary coil, and modulates the return signal on the secondary coil.

Preferably, the transmitting device can include an over temperature protection circuit connected to the transmitting end controller.

Preferably, the transmitting device may include a transmitting end display light number connected to the transmitting end controller to display the power supply state of the transmitting device.

Preferably, the receiving device can include a motor driving circuit selectively powered by the DC charging power source or the rechargeable battery, and connected to the receiving end controller to receive the pulse width modulation control signal to drive the motor to rotate.

Preferably, the receiving device may include a receiving end display light number, is connected to the power selection circuit, displays the power supply state and the charging state of the receiving device, and transmits the power supply state signal and the charging state signal to the receiving end controller.

According to the purpose of the present invention, a transmitting device is proposed to wirelessly charge a receiving device, the transmitting device comprising a driving circuit, a primary coil, a demodulating circuit and a transmitting end controller. The driving circuit is connected to the power supply device, receives the DC input power, and receives the pulse width modulation signal to convert the DC input power into an AC power source. The primary coil is connected to the drive circuit and receives AC power. The demodulation circuit is connected to the primary coil, and the return signal transmitted by the primary coil is decoded to form an input signal. The transmitting end controller is connected to the demodulation circuit and the driving circuit, receives the input signal and generates a pulse width modulation signal correspondingly, and transmits the signal to the driving circuit. The primary coil is electromagnetically coupled to the secondary coil of the receiving device, and the rechargeable battery of the receiving device is charged by the alternating current power source, and the power supply state and the charging state of the receiving device generate a return signal by the receiving end controller, and are modulated by the modulation circuit. The secondary coil is returned to the receiving device by the electromagnetically coupled primary coil.

Preferably, the transmitting device can include an over temperature protection circuit connected to the transmitting end controller.

Preferably, the transmitting device may include a transmitting end display light number connected to the transmitting end controller to display the power supply state of the transmitting device.

According to the purpose of the present invention, a receiving device is proposed, which performs wireless charging by a transmitting device, and the receiving device comprises a secondary coil, a rectifying and stabilizing circuit, a receiving end controller and a modulating circuit. The secondary coil is electromagnetically coupled to the primary coil of the transmitting device to receive AC power. The rectifying and stabilizing circuit is connected to the secondary coil to convert the AC power into a DC charging power source, and the DC charging power source charges the rechargeable battery. The receiving end controller is connected to the rectifying and regulating circuit and the rechargeable battery, and receives the power supply status signal and the charging status signal and generates a return signal correspondingly. The modulation circuit is connected to the receiving end controller and the secondary coil, and modulates the return signal on the secondary coil. The return signal is transmitted back to the receiving device by the electromagnetic coupling primary coil, and is decoded by the demodulation circuit to form an input signal. The transmitting end controller of the transmitting device generates a pulse width modulation signal corresponding to the input signal, and controls the driving circuit to adjust the communication. power supply.

Preferably, the receiving device can include a motor driving circuit selectively powered by the DC charging power source or the rechargeable battery, and connected to the receiving end controller to receive the pulse width modulation control signal to drive the motor to rotate.

Preferably, the receiving device may include a receiving end display light number, is connected to the power selection circuit, displays the power supply state and the charging state of the receiving device, and transmits the power supply state signal and the charging state signal to the receiving end controller.

In view of the above, the wireless charging system of the present invention and its transmitting device and receiving device can have one or more of the following advantages:

(1) The wireless charging system, the transmitting device and the receiving device thereof can design the charging coil to have a planar shape, so that the charging coil can be mounted on the side of the electronic device and the charging stand, in selecting the coil mounting position and the device structure design. Have more freedom.

(2) The wireless charging system, its transmitting device and the receiving device can use the coil for data communication, and the receiving device can modulate the charging current, the battery power and the like on the coil to return the message to the transmitting device, and the transmitting device further The received information instantly adjusts the amount of charging current to achieve immediate feedback and control.

(3) The wireless charging system and its transmitting device and receiving device can solve the problem of inconsistent charging current caused by the component error of the device during mass production, and adjust according to the actual demand state of the receiving device, compared with the fixed charging current on the market. The charging method can wirelessly charge with the most appropriate power to improve the charging efficiency.

In order to understand the technical characteristics, content and advantages of the creation and the effects that can be achieved by the examiner, the author will use the drawings in detail and explain the following in the form of the examples, and the drawings used therein The subject matter is only for the purpose of illustration and supplementary manual. It is not necessarily the true proportion and precise configuration after the implementation of the original creation. Therefore, the proportion and configuration relationship of the attached drawings should not be limited to the scope of patents created in actual implementation. Narration.

The embodiments of the wireless charging system and its transmitting device and receiving device according to the present invention will be described below with reference to the related drawings. For ease of understanding, the same components in the following embodiments are denoted by the same reference numerals.

Please refer to FIG. 1, which is a block diagram of a wireless charging system in accordance with an embodiment of the present invention. As shown, the wireless charging system 1 includes a transmitting device 10 and a receiving device 20. The transmitting device 10 can be a charging stand or a charging pad, and is connected to a power supply device 50 such as a USB power supply to receive a DC input power. The receiving device 20 can be a handheld electronic device, such as an electric toothbrush, an electric razor, a beauty instrument, a wireless microphone, etc., but the present invention is not limited to the above devices. The receiving device 20 is disposed corresponding to the transmitting device 10. For example, the charging stand is designed to correspond to the base of the electric toothbrush. When the electric toothbrush is placed on the base, the receiving device 20 and the induction coil of the transmitting device 10 can be coupled to each other.

Further, the transmitting device 10 includes a driving circuit 100, a primary coil 101, a demodulating circuit 102, a transmitting end controller 103, and an over temperature protection circuit 104. The driving circuit 100 is connected to the power supply device 50 and receives a DC input power source, for example, a DC power source having an input voltage of 5V. The driving circuit simultaneously receives the pulse width modulation signal transmitted by the transmitting end controller 103, for example, the switching frequency is between 100-200 kHz, and can be adjusted according to the coil and power requirements. The DC input power is converted to an AC power source by a pulse width modulation signal, and is transmitted to the primary coil 101. When the coils of the transmitting device 10 and the receiving device 20 are coupled, electrical energy can be transmitted from the coil of the transmitting device 10 to the coil of the receiving device 20 for wireless powering.

In addition to the power transfer portion described above, the transmitting device 10 also has a portion for data communication with the receiving device 20. In detail, the transmitting device 10 is provided with a demodulation circuit 102, which is connected to the primary coil 101, and detects the return signal carried by the primary coil 101 while the coil is coupled for power transmission, and is subjected to demodulation, filtering, shaping, etc. After the decoding, the input signal forming the returned data is transmitted to the transmitting controller 103. The transmitting end controller 103 can be a microcontroller, and is disposed in the transmitting device 10 in a manner of controlling the chip. After receiving the input signal of the demodulating circuit 102, the transmitting end controller generates a pulse width modulation signal and transmits the signal to the driving circuit 100. The backhaul data described herein may include the charging current required by the receiving device 20 and the actually received charging current, or information on the amount of battery power, and the transmitting end controller 103 sends a pulse width modulation corresponding to the information. The signal is sent to the driving circuit 100 to adjust the charging current amount, improve the charging efficiency, and reduce the necessary power loss, for example, to change the minimum power supply after the battery is full. In addition, the over temperature protection circuit 104 is connected to the transmitting end controller 103 to monitor the operation of the controller. When the temperature exceeds the preset value, the signal is sent to the transmitting end controller 103 to protect the operation of the transmitting device 10 to prevent damage caused by overheating. Improve the security of use.

The receiving device 20 includes a secondary coil 200, a rectifying and regulating circuit 201, a rechargeable battery 202, a receiving end controller 203, a modulation circuit 204, and a motor drive circuit 205. The secondary coil 200 is electromagnetically coupled to the primary coil 101 of the transmitting device 10, receives the AC power, and converts the AC power into a DC power source through the rectifier voltage stabilizing circuit 201, and is stabilized by the chip control circuit to form a stable DC charging power source. The rechargeable battery 202 is charged. The rechargeable battery is connected to the rectifying and stabilizing circuit, and the rechargeable battery is charged by the DC charging power source. While the transmitting device 10 is coupled to the coil of the receiving device 20 for wireless charging, the receiving end controller 203 of the receiving device 20 monitors the DC charging power supply state and the charging battery charging state, and correspondingly generates a return signal, which is transmitted back here. The signal may include both the power supply state through the rectification voltage regulator circuit 201 and the state of charge of the rechargeable battery 202, or may include only information of a single state. The receiving end controller 203 transmits the backhaul signal to the modulation circuit 204, and the signal to be backhauled by the communication is modulated on the secondary coil 200 by the amplitude modulation technique, so that the secondary coil 200 of the receiving device 20 and the primary coil 101 of the transmitting device 10 In the coupling, in addition to the power transmission, the data communication transmission is also performed at the same time, and the actual state of the wireless charging is transmitted back to the transmitting device 10, and the power of the wireless charging is adjusted according to the foregoing manner to achieve the optimal charging efficiency.

In the receiving device 20, a motor driving circuit 205 is further provided, which is connected to the rectifying and regulating circuit 201 and the rechargeable battery 202. When performing wireless charging, the motor driving circuit 205 can select to be powered by the rechargeable battery 202 according to the charging state of the rechargeable battery 202. Or directly from the DC charging power supply. In addition, the motor drive circuit 205 is also coupled to the receive segment controller 203 to receive the pulse width modulation control signal, thereby driving the motor 206 to adjust the frequency of the rotation or vibration. This embodiment is described with the motor required for the operation of the electric toothbrush. However, the present invention is not limited thereto, and other electronic devices that operate using the rechargeable battery 202 may be executed by using a corresponding driving circuit instead. Therefore, the technical means described in the present invention include various handheld electronic devices that can perform wireless charging.

Next, the 2A, 2B, and 3A, 3B diagrams will further introduce the circuit design diagram of the transmitting device 10 and the receiving device in the wireless charging system 1 of FIG. 1, which includes a plurality of capacitors C, transistors Q, and resistors. R, diode D, control wafer unit U, amplifier, etc. are combined in series and parallel, but it should be understood that the 2A, 2B and 3A, 3B diagrams are only one example of this creation, the user can achieve the same Under the function, it flexibly plans the internal passive component combination.

Please refer to FIG. 2A and FIG. 2B, which are circuit diagrams of the transmitting device of the embodiment of the present invention. Please refer to FIG. 1 at the same time. FIG. 2A corresponds to the driving circuit 100, the primary coil 101 and the demodulation in the transmitting device 10. The circuit 102, FIG. 2B corresponds to the transmitter controller 103 and the overtemperature protection circuit 104 in the transmitting device 10. The block 300 in FIG. 2A corresponds to the driving circuit 100 of the transmitting device 10. The control chip receives the pulse width modulation signal (PWM) and the DC input power (+5V), and adjusts the output power to the block 301. The LC oscillator is transmitted to the primary coil J1. The backhaul signal carried by the primary coil J1 is retrieved (CAP0) and transmitted to the demodulation circuit 102 of the block 302, and then via the RC filter of the block 303, the amplifier of the block 304, and the comparator of the block 305. The circuit forms an input signal (DATA_IN).

In FIG. 2B, the input signal is received via the chip pin of the transmitting end controller 103 corresponding to the block 306, and correspondingly generates a pulse width modulation signal (PWM), and is transmitted to the driving circuit 100 of the block 300. In addition, the transmitter controller is also coupled to the overtemperature protection circuit 104 of block 307 and the transmitter display signal of block 308. The over-temperature protection circuit includes a heat-sensitive resistor that transmits a signal (ADC_IN) to the transmitting-end controller 103 when the temperature exceeds a preset value to prevent the transmitting device from being overheated and damaged. The indicator light on the transmitting end can contain LEDs of different colors to indicate the power supply status of the transmitting device.

Please refer to FIG. 3A and FIG. 3B, which are circuit diagrams of the receiving device of the embodiment of the present invention. Referring to FIG. 1 again, FIG. 3A corresponds to the secondary coil 200, the rectifying and regulating circuit 201, the receiving end controller 202, and the modulating circuit 204 among the receiving device 20, and FIG. 3B corresponds to the rechargeable battery 202 in the receiving device 20. The motor drive circuit 205, the power supply selection circuit, and the receiving end display the light number. The block 400 in FIG. 3A is an LC oscillator of the receiving device 20 and includes a secondary coil J2. After being coupled to the coil of the transmitting device 10, the AC power is received, and is converted into a DC charging power source (+5V) via the rectifier circuit of the block 401, the input voltage detecting circuit of the block 402, and the step-down circuit of the block 403. The DC power supply here can supply power (VIN) to the receiving controller 203 corresponding to the block 404, and the power supply state can also be transmitted to the modulation circuit of the block 405 through the return signal (DATA), and the signal is modulated in the secondary. On the coil J2, for data communication, the data is transmitted back to the transmitting device 10.

In FIG. 3B, block 406 is a motor driving circuit of the receiving device 20, which is connected to the rechargeable battery (BAT1), and is powered by a battery power source or a charging power source, and is coupled with a pulse width modulation control transmitted by the receiving end controller 202. Signal, drive motor (MOTOR) rotates. The receiving device 20 may further include a charging current control circuit of the block 407, a battery voltage detecting circuit of the block 408, and a power supply selecting circuit of the block 409. The power supply voltage (VCC) determined by the power supply selecting circuit may be used by the area. The receiving end 5 of the block 410 displays the signal indicating the power supply state of the receiving device, and transmits the power supply status signal to the receiving end controller 202.

Please refer to FIG. 4, which is a schematic view of an electric toothbrush according to an embodiment of the present invention. As shown in the figure, the transmitting device of the wireless charging system may be the charging base 11, and the receiving device may be an electric toothbrush 21, and the charging base 11 may be connected to the USB power supply device or the commercial power, and the space for the electric toothbrush 21 is designed. The electric toothbrush 21 can be placed on the charging stand 11 for wireless charging. In addition, the induction coil 111 of the charging base 11 has a planar shape and can be disposed on the side of the device, and does not need to design a slot, a groove or the like at the bottom as in the existing charging device, thereby having greater freedom in structural design of the device. degree. Similarly, the induction coil of the electric toothbrush 21 is also in a corresponding planar shape, and is also disposed on the side of the device. There are more options for the design of the appearance of the handheld device, and it is no longer limited to the groove structure. At the same time, the size of the coil can be further reduced than the prior art, for example, less than 15 mm, so that there is more room for change in product design and internal structural configuration.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of this creation shall be included in the scope of the appended patent application.

1‧‧‧Wireless charging system
10‧‧‧ Launcher
11‧‧‧ charging stand
20‧‧‧ Receiving device
21‧‧‧Electric toothbrush
50‧‧‧Power supply unit
100‧‧‧ drive circuit
101, J1‧‧‧ primary coil
102‧‧‧Demodulation circuit
103‧‧‧transmitter controller
104‧‧‧Over temperature protection circuit
111‧‧‧Induction coil
200, J2‧‧‧ secondary coil
201‧‧‧Rectification regulator circuit
202‧‧‧Rechargeable battery
203‧‧‧ Receiver controller
204‧‧‧Modulation circuit
205‧‧‧Motor drive circuit
206‧‧‧Motor
300~307, 400~410‧‧‧ blocks
C‧‧‧ capacitor
D‧‧‧ diode
Q‧‧‧Optocrystal
R‧‧‧resistance
U‧‧‧Control wafer unit

Figure 1 is a block diagram of a wireless charging system in accordance with an embodiment of the present invention.

2A and 2B are schematic diagrams showing the circuit of the transmitting device of the embodiment of the present invention.

3A and 3B are circuit diagrams of the receiving device of the embodiment of the present invention.

Figure 4 is a schematic view of an electric toothbrush according to an embodiment of the present invention.

Claims (10)

A wireless charging system includes: a transmitting device, comprising: a driving circuit connected to a power supply device, receiving a DC input power source, and receiving a pulse width modulation signal, converting the DC input power into a An AC power source is connected to the driving circuit and receives the AC power source; a demodulation circuit is connected to the primary coil, and decodes a return signal of the primary coil to form an input signal, and a transmitting end controller is connected to the demodulating circuit and the driving circuit, receives the input signal and correspondingly generates the pulse width modulation signal, and transmits the signal to the driving circuit; and a receiving device is disposed corresponding to the transmitting device The method includes: a secondary coil electrically coupled to the primary coil to receive the alternating current power; a rectifying and stabilizing circuit coupled to the secondary coil to convert the alternating current power into a direct current charging power source, the direct current charging power source a rechargeable battery for charging; a receiving end controller connected to the rectifying and regulating circuit and the rechargeable battery Receiving a signal and a power supply state and a state of charge signal is generated corresponding to the feedbacks; and a modulation circuit connected to the system controller and the receiving end of the coil, the feedbacks on the modulation coil. The wireless charging system of claim 1, wherein the transmitting device comprises an over temperature protection circuit connected to the transmitting end controller. The wireless charging system of claim 1, wherein the transmitting device comprises a transmitting terminal display signal connected to the transmitting end controller to display a power supply state of the transmitting device. The wireless charging system of claim 1, wherein the receiving device comprises a motor driving circuit selectively powered by the DC charging power source or the rechargeable battery, and connected to the receiving end controller to receive a The pulse width modulation control signal drives a motor to rotate. The wireless charging system of claim 1, wherein the receiving device comprises a receiving end display light, connected to a power selection circuit, displaying the power supply state and the charging state of the receiving device, and the power supply state The signal and the charging status signal are transmitted to the receiving end controller. A transmitting device for wirelessly charging a receiving device, comprising: a driving circuit connected to a power supply device, receiving a DC input power source, and receiving a pulse width modulation signal, converting the DC input power into An AC power supply; a primary coil is connected to the driving circuit to receive the AC power; a demodulation circuit is connected to the primary coil, and decodes a backhaul signal carried by the primary coil to form an input signal, And a transmitting end controller connected to the demodulating circuit and the driving circuit, receiving the input signal and correspondingly generating the pulse width modulation signal, and transmitting the signal to the driving circuit; wherein the primary coil is electromagnetically coupled to the receiving device a secondary coil, wherein the charging battery is charged by the AC power source, and the power supply state and the charging state of the receiving device are generated by a receiving controller, and modulated by the modulation circuit. The primary coil is returned to the receiving device by electromagnetic coupling of the primary coil. The transmitting device of claim 6, further comprising an over-temperature protection circuit connected to the transmitting end controller. The transmitting device of claim 6, further comprising a transmitting end display signal connected to the transmitting end controller to display a power supply state of the transmitting device. A receiving device is wirelessly charged by a transmitting device, comprising: a secondary coil electromagnetically coupled to a primary coil of the transmitting device to receive an alternating current power; and a rectifying and stabilizing circuit connected to the secondary a coil, the AC power is converted into a DC charging power source, the DC charging power source charges a rechargeable battery; a receiving end controller is connected to the rectifying voltage regulator circuit and the rechargeable battery, receives a power supply status signal and a charging The status signal generates a back signal correspondingly; and a modulation circuit is connected to the receiving end controller and the secondary coil, and the back signal is modulated on the secondary coil; wherein the back signal is The primary coil of the electromagnetic coupling is transmitted back to the receiving device, and is decoded by a demodulation circuit to form an input signal. The transmitting end controller generates a pulse width modulation signal corresponding to the input signal, and controls a driving circuit. Adjust the AC power. The receiving device of claim 9, further comprising a motor driving circuit selectively powered by the DC charging power source or the rechargeable battery, and connected to the receiving end controller for receiving a pulse width modulation The control signal drives a motor to rotate.