CN114394004A - A battery car sharing wireless charging device - Google Patents

Abstract

The invention discloses a sharing wireless charging device for battery cars, which combines wireless charging with a fixing pile sharing the battery cars, and is light and simple, wherein the fixing pile is designed into a charging pile, a plurality of transmitting coils are arranged at the top, an insulating coil is wound on the outer side of each transmitting end, the transmitting coils are uniformly distributed at the top, and a man-machine interaction platform is carried; a plurality of receiving coils are arranged at the bottom of the bicycle basket and used as receiving ends of the wireless charging platform, and an insulating coil is wound on the outer side of each coil; the solar panel is arranged on the top of the bicycle basket, so that solar energy in the driving process can be converted into electric energy to supplement electric quantity and be used emergently; the transmitting end and the receiving end are internally controlled by the single chip microcomputer, the invention can realize a man-machine interaction interface, control the transmitting power and the receiving power in real time, collect charging data sets and transmit data sets, and skillfully solve the potential safety hazard problems of difficult charging of the storage battery car, difficult management of the storage battery car, private pull wire charging and the like.

Description

A battery car sharing wireless charging device

technical field

The invention belongs to the technical field of wireless charging, and more particularly, relates to a shared wireless charging device for battery vehicles.

Background technique

Wireless charging technology has become more and more mature in recent years, and wireless charging based on the principle of electromagnetic induction is currently the most widely used, among which low-power charging such as digital device charging has flourished. Now wireless charging technology has shown great potential in the market, and the wireless charging method of wireless charging provides a more convenient way to charge devices.

The wireless charging power supply of the WPC Alliance is mainly popular in the market. for smartphones. In addition, the wireless charging technology of the WPC Alliance also has shortcomings and limitations such as low output power and short power transmission distance. There are no relatively mature products on the market for electric equipment such as battery cars that require a charging power of 200W.

After searching, it is found that relevant patents have been published to solve the shortcomings of the above-mentioned wireless charging technology, such as low output power and short power transmission distance. For example, the Chinese patent application number: CN201120265544.2, the application date: July 26, 2011, the utility model patent discloses a wireless charging system for electric vehicles. The charging system includes a power supply terminal connected to the power grid, and a power receiving terminal installed on the electric vehicle and connected to the battery of the electric vehicle. The input end of the rectification unit is connected to the power grid; the power receiving end includes a receiving coil and a rectifying unit connected in series, wherein the output end of the rectifying unit is connected to the battery of the electric vehicle; magnetic cores are installed in the transmitting coil and the receiving coil. This solution adopts a fixed charging stand, and needs to install a receiving coil lifting structure on the vehicle to ensure the received power, which is costly and cumbersome to use.

For another example, the Chinese patent application number is: CN202110361597.2, the application date is: April 2, 2021, the utility model patent discloses a wireless charging device for electric bicycles. The device includes an electric bicycle and a charging pile for wirelessly charging the electric bicycle; the electric bicycle includes a wireless charging receiver, a controller, a rechargeable battery and a power drive; the charging pile includes a wireless charging transmitter and a control box; the wireless charging receiver is set to The tubular structure is arranged on the handle of the electric bicycle, the wireless charging transmitter is set as a cylindrical structure, and the wireless charging transmitter is used in conjunction with the wireless charging receiver; the control box is connected with the wireless charging transmitter, and is used for the wireless charging transmitter. Power supply and control; the wireless charging receiver is electrically connected to the rechargeable battery, and is used to generate induced electromotive force according to the electromagnetic wave emitted by the wireless charging transmitter to supply power to the rechargeable battery; the controller controls the rechargeable battery to supply power to the power drive and controls the power drive to work. This solution adopts a special plug-in structure, which puts the transmitter and receiver coils of wireless charging in it, and keeps the coils within a reliable distance by plugging in. Compared with wired charging, this method has no great advantages in terms of convenience. , and reduce the efficiency.

SUMMARY OF THE INVENTION

Aiming at the problems of low charging efficiency, complex structure, poor convenience and inconvenience in use in the existing wireless charging technology, the present invention provides a shared wireless charging device for battery cars, which is provided with a bracket-type wireless charging transmitter and is combined with a car basket The new wireless charging device not only solves the shortcomings of low output power, short vertical transmission distance of electricity and inconvenient use, but also improves the applicability of wireless chargers.

In order to solve the above problems, the present invention adopts the following technical solutions.

A shared wireless charging device for battery vehicles, comprising a receiving device, a power converter and a transmitting device, the transmitting device is fixed on the upper part of a fixing bracket for fixing the front wheel of an electric vehicle, and the receiving device is installed inside the basket; the transmitting device The input end of the device is connected to an external power supply, and the output end of the device is connected to the input end of the receiving device, and the output end of the receiving device is connected to the battery of the electric vehicle through the power converter.

In a further technical scheme, the transmitting device includes a transmitting device casing, a transmitting coil group and a transmitting end control circuit; the transmitting device casing is installed on the upper part of the fixed bracket; the transmitting coil group and the transmitting end control circuit are installed in the transmitting device casing. Internal; the input end of the transmitting end control circuit is connected with the external power supply, the output end is connected with the input end of the transmitting coil group, and the output end of the transmitting coil group is connected with the receiving device.

In a further technical solution, the launching device further includes a human-computer interaction screen, and the human-computer interaction screen is installed above the shell of the launching device; the human-computer interaction screen is connected to the transmitter control circuit for bidirectional communication, and the transmitter control circuit is connected to the user's mobile phone. Connect via Bluetooth communication.

In a further technical solution, the receiving device includes a wireless charging receiving coil group and a primary resonant rectifier circuit, the wireless charging receiving coil group is installed inside the basket, and the primary resonant rectifying circuit is installed on the bottom of the basket; one end of the wireless charging receiving coil group is connected to the The output end of the transmitting coil group is connected, the other end of the wireless charging receiving coil group is connected with the input end of the primary resonance rectifier circuit, and the output end of the primary resonance rectifier circuit is connected with the input end of the charging converter.

In a further technical solution, the receiving device further includes a magnetic conductive plate, the magnetic conductive plate is installed inside the basket and located above the wireless charging receiving coil set.

In a further technical solution, the receiving device further includes a solar panel, and the output end of the solar panel is connected to the battery of the electric vehicle.

In a further technical solution, the primary resonant rectifier circuit includes a capacitor CC ₁ , a capacitor CC ₂ , a capacitor CC ₃ , a capacitor CC ₄ , a capacitor C ₁ , a capacitor C ₂ , a diode D ₂ and a diode D ₃ ;

Among them, one end of the capacitor CC ₁ , the capacitor CC ₂ , the capacitor CC ₃ and the capacitor CC ₄ are all connected to the output end two of the wireless charging receiving coil set, and the other ends of the capacitor CC ₁ , the capacitor CC ₂ , the capacitor CC ₃ and the capacitor CC ₄ are all connected Connect to the cathode of diode D2 and the anode of diode _D3 , the anode of diode D3 is connected to one end of capacitor _C1 and capacitor _C2 , the cathode of diode _D2 , the other end of capacitor _C1 and capacitor _C2 and the wireless charging receiving coil The output terminal of the group is grounded; the two ends of the capacitor C ₂ form the output terminal of the primary resonant rectifier circuit.

In a further technical solution, a bottom surface protection cover is movably installed at the bottom of the basket.

In a further technical solution, a protective baffle is arranged on the outer periphery of the human-computer interaction screen.

Compared with the prior art, the beneficial effects of the present invention are:

(1) A battery car sharing wireless charging device of the present invention uses a multi-coil transmission and reception method, and adds a magnetic conductive sheet to increase the magnetic flux, thereby improving the wireless charging receiving distance and charging efficiency.

(2) A battery car sharing wireless charging device of the present invention has a human-computer interaction interface, which can control the system and obtain the operation status of the device from the interaction interface.

(3) A shared wireless charging device for a battery car of the present invention does not require additional mechanical components, is low in cost, and is easy to use, and the existing products only need a few modifications to realize wireless charging.

(4) A shared wireless charging device for battery cars of the present invention adopts a fully fixed structure without moving parts, so it has good durability, good sealing performance and is not easily damaged.

Description of drawings

1 is a schematic structural diagram of a wireless charging basket of the present invention;

2 is a schematic diagram of the bottom of the wireless charging basket of the present invention;

Fig. 3 is the internal structure diagram of the wireless charging basket of the present invention;

4 is a schematic structural diagram of a transmitting device of the present invention;

Fig. 5 is the internal structure diagram of the launching device of the present invention;

6 is a schematic structural diagram of a charging pile of the present invention;

7 is a power diagram of a receiving end of the present invention;

8 is a schematic diagram of the principle of the primary resonant rectifier circuit of the present invention;

9 is a schematic diagram of the connection of the charging converter circuit of the present invention;

FIG. 10 is a schematic diagram of the closed-loop algorithm of the charging converter of the present invention.

The symbols in the figure are: 1. Car basket; 2. Magnetic conductive plate; 3. Wireless charging receiving coil set; 4. Primary resonant rectifier circuit; 5. Solar panel; 6. Bottom protective cover; Human-computer interaction screen; 9. Fixed bracket; 10. Transmitting coil group; 11. Transmitter control circuit.

Detailed ways

The present invention will be further described below with reference to specific embodiments and accompanying drawings.

Example

This embodiment provides a shared wireless charging device for battery vehicles, as shown in FIGS. 1 to 6 , including a receiving device, a power converter, and a transmitting device, and the transmitting device is fixed on the upper part of the fixing bracket 9 for fixing the front wheel of the electric vehicle , the fixing bracket 9 is used to fix the front wheel of the electric bicycle, so that the battery car is more stable when charging. The receiving device is installed inside the basket 1 . A bottom surface protection cover 6 is movably installed at the bottom of the basket 1 to protect the receiving device inside.

The transmitting device includes a transmitting device casing 7 , a human-computer interaction screen 8 , a transmitting coil set 10 and a transmitting terminal control circuit 11 . The transmitter casing 7 is mounted on the upper part of the fixed bracket 9 , and the transmitter coil group 10 and the transmitter control circuit 11 are mounted inside the transmitter casing 7 . The human-computer interaction screen 8 is installed above the transmitter housing 7 . A protective baffle is provided on the outer periphery of the human-computer interaction screen 8 for protecting the human-computer interaction screen 8 .

The receiving device includes a magnetic conductive plate 2 , a wireless charging receiving coil group 3 , a primary resonant rectifier circuit 4 and a solar panel 5 . The wireless charging receiving coil group 3 is installed inside the basket 1 , and the primary resonant rectifier circuit 4 is installed at the bottom of the basket 1 . The magnetic conductive plate 2 is installed inside the basket 1 and above the wireless charging receiving coil group 3 , and is used to enhance wireless communication between the wireless charging receiving coil group 3 and the transmitting coil group 10 . The output end of the solar panel 5 is connected to the battery of the electric vehicle, and the solar panel 5 is used to convert the solar energy during driving or parking into electric energy, and transmit it to the battery of the electric vehicle to assist charging.

The input end of the transmitter control circuit 11 is connected to the external power supply, the output end of the transmitter control circuit 11 is connected to the input end of the transmitter coil group 10, the output end of the transmitter coil group 10 is connected to one end of the wireless charging receiving coil group 3, and the wireless The other end of the charging receiving coil set 3 is connected to the input end of the primary resonant rectifier circuit 4, the output end of the primary resonant rectifier circuit 4 is connected to the input end of the charging converter, and the output end of the power converter is connected to the electric vehicle battery. The human-computer interaction screen 8 is connected with the transmitter control circuit 11 for bidirectional communication, and the transmitter control circuit 11 is connected with the user's mobile phone through Bluetooth communication.

The working principle of the battery car sharing wireless charging device is as follows:

In the transmitting device, the power line is connected to the power grid, and passes through the input end of the transmitting end control circuit 11 from the fixed bracket 9. On the transmitting end control circuit 11, it is first converted into 48V and 12V voltage through the power conversion circuit, among which 48V is used as the power supply voltage input of the transmitting coil group 10 , a part of the 12V obtained by step-down is used as the power supply voltage input of the driving circuit, and another part of 12V is converted into 3.3V voltage by the LDO as the power supply of the transmitter control circuit 11 .

The microcontroller used by the transmitter control circuit 11 is STM32G431CBT6, and the human-computer interaction screen 8, ESP8266, 4G module, and the drive circuit of the transmitter coil group 10 are connected to the transmitter control circuit 11. In the idle state, the MCU on the transmitter control circuit 11 is updated through the 4G module network, and controls the human-computer interaction screen 8 to display the charging verification QR code, and controls the drive circuit of the transmitter coil group 10 to stop to save power. After the user scans the QR code, he enters the charging verification platform. At the same time, under the guidance of the mobile phone program, the Bluetooth connects to the ESP8266 on the transmitter control circuit 11. When the user passes the verification and clicks to start charging, the transmitter control circuit 11 controls the human-computer interaction screen. 8. Display the charging interface, and display the charging power and full state in real time. At the same time, the transmitter control circuit 11 controls the driving circuit of the transmitter coil group 10 to work, and reads the voltage and current collected from the power circuit in real time for the human-computer interaction screen 8 Real-time display and real-time upload through the 4G module mounted on the transmitter control circuit 11. When charging, the user can monitor the charging status of the electric bicycle in real time through the mobile phone program.

The receiving device is integrally combined with the basket 1. After the wireless charging receiving coil group 3 receives the wireless energy transmitted from the transmitting coil group 10, it transmits the obtained electric energy to the primary resonant rectifier circuit 4, and the wireless charging receiving coil group 3 receives the wireless energy. After LC resonance, the wireless energy received by the wireless charging receiving coil group 3 is converted into DC output through voltage doubler rectification, and the DC power is transmitted to the charging converter for constant current, constant voltage step-down and power matching, so that the battery to charge.

Among them, as shown in Figure 5, the primary resonant rectifier circuit is divided into two parts, ① represents the LC resonant circuit, and ② represents the voltage doubler rectifier circuit. The primary resonant rectifier circuit 4 includes a capacitor CC ₁ , a capacitor CC ₂ , a capacitor CC ₃ , a capacitor CC ₄ , a capacitor C ₁ , a capacitor C ₂ , a diode D ₂ and a diode D ₃ ; wherein the capacitor CC ₁ , the capacitor CC ₂ , and the capacitor CC ₃ and one end of the capacitor CC ₄ are connected to the output end 2 of the wireless charging receiving coil group 3, and the other ends of the capacitor CC ₁ , the capacitor CC ₂ , the capacitor CC ₃ and the capacitor CC ₄ are all connected to the negative electrode of the diode D ₂ and the negative electrode of the diode D ₃ . The positive electrode is connected, the positive electrode of the diode D3 is connected to one end of the capacitor _C1 and the capacitor _C2 , the negative electrode of the diode D2, the other end of the capacitor _C1 and the capacitor _C2 and the output end of the wireless charging receiving coil group 3 are grounded; the capacitor _C2 Both ends form the output end of the primary resonant rectifier circuit 4 .

The charging converter circuit is a synchronous rectification and step-down circuit designed by the control of STM32G431CBT6. As shown in Figure 6, the DC power from the primary resonant rectifier circuit 4 is used as the input of the charging converter circuit, and the obtained DC power goes through the step-down circuit. The 3.3V is transmitted to the MCU to supply power, and the DC power supply is also used as the input of the synchronous rectification and step-down circuit. The MCU receives the current and voltage data returned by the synchronous rectification and step-down circuit in real time, analyzes the working power and working status of the entire receiving system in real time, and conducts As shown in the P-I control of current and voltage shown in Figure 7, the MCU compares the target voltage of the output battery terminal collected with the maximum voltage that the input terminal can provide constantly, and takes the minimum value as the output voltage connected to the battery terminal, and uses the collected output voltage. The difference between the current and the target charging current is used as the input of the P-I controller, and the output of the P-I controller is used as the basis for PWM modulation. Therefore, the output PWM performs P-I control combining voltage and current, so as to realize constant current, constant voltage control and input The power is matched to the target power to improve the overall charging efficiency.

The whole control system is controlled by MCU, and the transmitting device adopts STM32G431CBT6, 4G module and ESP8266 module to realize control and communication. The charge controller uses STM32G431CBT6 as the controller to control the half-bridge synchronous rectifier circuit for step-down and constant-current control.

The examples described in the present invention are only to describe the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Deformations and improvements should fall within the protection scope of the present invention.

Claims (9)

1. A shared wireless charging device for battery vehicles, characterized in that it comprises a receiving device, a power converter and a transmitting device, the transmitting device is fixed on the upper part of a fixing bracket (9) for fixing the front wheel of an electric vehicle, and the receiving device is The device is installed inside the basket (1); the input end of the transmitting device is connected to an external power source, and the output end thereof is connected to the input end of the receiving device, and the output end of the receiving device is connected to an electric vehicle battery through a power converter. 2. A shared wireless charging device for battery cars according to claim 1, characterized in that: the transmitting device comprises a transmitting device casing (7), a transmitting coil set (10) and a transmitting end control circuit (11); the The transmitter casing (7) is mounted on the upper part of the fixed bracket (9); the transmitter coil group (10) and the transmitter control circuit (11) are mounted inside the transmitter casing (7); the transmitter control circuit (11) ) is connected to the external power supply, its output is connected to the input end of the transmitting coil group (10), and the output end of the transmitting coil group (10) is connected to the receiving device. 3. A battery-car sharing wireless charging device according to claim 2, characterized in that: the transmitting device further comprises a human-computer interaction screen (8), and the human-computer interaction screen (8) is installed on the transmitting device casing (7) the upper part; the human-computer interaction screen (8) is connected with the transmitter control circuit (11) for bidirectional communication, and the transmitter control circuit (11) is connected with the user's mobile phone through Bluetooth communication. 4. A battery-car sharing wireless charging device according to claim 3, characterized in that: the receiving device comprises a wireless charging receiving coil group (3) and a primary resonant rectifier circuit (4), and the wireless charging receiving coil group (3) ) is installed inside the basket (1), the primary resonant rectifier circuit (4) is installed at the bottom of the basket (1); one end of the wireless charging receiving coil group (3) is connected to the output end of the transmitting coil group (10), The other end of the wireless charging receiving coil group (3) is connected to the input end of the primary resonance rectifier circuit (4), and the output end of the primary resonance rectifier circuit (4) is connected to the input end of the charging converter. 5 . The shared wireless charging device for battery vehicles according to claim 4 , wherein the receiving device further comprises a magnetic conductive plate ( 2 ), and the magnetic conductive plate ( 2 ) is installed inside the vehicle basket ( 1 ). 6 . , and is located above the wireless charging receiving coil group (3). 6 . The shared wireless charging device for battery vehicles according to claim 5 , wherein the receiving device further comprises a solar panel ( 5 ), and the output end of the solar panel ( 5 ) is connected to the battery of the electric vehicle. 7 . 7 . The battery-car sharing wireless charging device according to claim 4 , wherein the primary resonant rectifier circuit ( 4 ) comprises a capacitor CC ₁ , a capacitor CC ₂ , a capacitor CC ₃ , a capacitor CC ₄ , and a capacitor C ₁ . , capacitor C ₂ , diode D ₂ and diode D ₃ ; Among them, one end of the capacitor CC ₁ , the capacitor CC ₂ , the capacitor CC ₃ and the capacitor CC ₄ are all connected to the output end 2 of the wireless charging receiving coil group (3). The capacitor CC ₁ , the capacitor CC ₂ , the capacitor CC ₃ and the capacitor CC _{4 The} other ends are connected to the cathode of diode D2 and the anode of diode _D3 , the anode of diode D3 is connected to one end of capacitor _C1 and capacitor _C2 , the cathode of diode D2, the other end of capacitor _C1 and capacitor _C2 and the wireless The output end of the charging receiving coil group (3) is grounded; the _two ends of the capacitor C2 form the output end of the primary resonance rectifier circuit (4). 8. A shared wireless charging device for battery vehicles according to any one of claims 1-7, characterized in that a bottom surface protection cover (6) is movably installed on the bottom of the basket (1). 9 . The shared wireless charging device for battery vehicles according to claim 8 , wherein a protective baffle is provided on the outer periphery of the human-computer interaction screen ( 8 ). 10 .

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