CN206283299U - A kind of wireless electric energy transmission device - Google Patents

Abstract

The utility model discloses a wireless energy transmission device. The system comprises four parts: a PWM wave generating circuit, a full-bridge inverter circuit, a resonant circuit and an AC-DC converting circuit. The system mainly studies the principle of wireless transmission, uses magnetic field coupling to realize wireless transmission, and uses 15V DC power supply for power supply. The high-frequency inverter circuit part is realized by a full bridge, and the four bridge arms are turned on or off in turn to stimulate an alternating current in the transmitting circuit , through the magnetic field coupling, an induced alternating current will be generated on the receiving circuit, and the energy will be transferred from the transmitting circuit to the receiving circuit. The AC signal of the receiving circuit passes through the AC-DC conversion circuit to output DC, which is used to drive the charger module. The utility model gets rid of the traditional power transmission mode, realizes non-contact new power transmission, reduces the use of wires, saves consumables such as copper and rubber, and avoids potential safety hazards.

Description

A wireless power transmission device

technical field

The utility model relates to a wireless energy transmission device, in particular to a wireless energy transmission device based on magnetic field coupling.

Background technique

Most of the current power transmission devices are wired power transmission. However, the wired power transmission device has the following problems: too many wires lead to confusion; consume a large number of wires and occupy too many resources; it is easy to cause accidents such as fire; and it is difficult to detect errors.

Therefore, it is necessary to develop a new type of power transmission device for the problem of wired power transmission, which can get rid of the troubles caused by wires, realize non-contact new power transmission, and reduce the use of wires.

Utility model content

The utility model mainly solves the problems of complicated wires and the like existing in wired power transmission, provides a wireless power transmission device based on magnetic field coupling, and realizes a new type of non-contact power transmission.

The above-mentioned technical problems of the utility model are mainly solved by the following technical solutions:

A wireless power transmission device, comprising sequentially connected PWM wave generation circuit, full-bridge inverter circuit, resonant circuit, AC-DC conversion circuit; the resonant circuit includes a transmitting loop and a receiving loop; the PWM wave generating circuit drives the inverter circuit , the inverter circuit stimulates the alternating current in the transmitting circuit of the resonant circuit, generates an induced alternating current on the receiving circuit of the resonant circuit through magnetic coupling, and outputs a direct current through the AC-DC conversion circuit to drive the load.

The PWM wave generation circuit includes a chip LTC6900 and an inverter; the chip LTC6900 generates a PWM wave with a precise duty cycle of 50% and a frequency of 130kHz, and the generated PWM wave passes through the inverter to obtain two reversed PWM waves. Wave, one is output by the LTC6900 chip, the other is output by the inverter, and the two reverse PWM waves drive the inverter circuit.

The full-bridge inverter circuit includes four switching tubes, four resistors, and a 2200μF capacitor C1;

A 9.1K resistor is connected between the G pole and the S pole of the four switch tubes D1, D2, D3, and D4; the D poles of the switch tube D1 and the switch tube D3 are connected to the positive pole of the 15V power supply; the D pole of the switch tube D2 is connected to the positive pole of the 15V power supply; The S pole of the switch tube D1 is connected; the D pole of the switch tube D4 is connected with the S pole of the switch tube D3; the S poles of the switch tube D2 and the switch tube D3 are grounded; the positive pole of the power supply is connected with the positive pole of the capacitor C1, and the negative pole of the power supply is connected with the capacitor C1. The negative pole of C1 is connected.

The AC-DC conversion circuit includes four diodes 1N4001 and one capacitor C0 of 220 μF; the cathode of the diode D1 is connected to the anode of the diode D4, and then connected to one end of the receiving circuit; the cathode of the diode D2 is connected to the anode of the diode D3, connected to To the other end of the receiving circuit and then grounded; the anode of the diode D1 is connected to the anode of the diode D2, and then connected to one end of the capacitor C0, the cathode of the diode D4 is connected to the cathode of the diode D3, and then connected to the other end of the capacitor C0; the load R0 connected in parallel across the capacitor C0.

The transmitting loop includes a series transmitting coil and a capacitor, and the receiving loop includes a series receiving coil and a capacitor; the two ends of the transmitting loop are respectively connected to the D pole of the switching tube D2 and the D pole of the switching tube D4; one end of the receiving loop It is connected between the cathode of the diode D1 and the anode of the diode D4, and the other end is connected between the cathode of the diode D2 and the anode of the diode D3.

The model of the inverter is 74HC04.

Compared with the prior art, the utility model gets rid of the traditional power transmission mode, realizes a new type of non-contact power transmission, reduces the use of wires, saves consumables such as copper and rubber, and avoids potential safety hazards. The transmitting coil and the receiving coil are coupled by a magnetic field, which are both LC resonant circuits in essence. The resonance frequency of the two loops is designed to be the same, and can be tuned to the resonance of the two coils. At this time, the transmission efficiency is the highest and the output power is also the highest.

Description of drawings

Fig. 1 is the PWM wave generating circuit diagram of the utility model.

Fig. 2 is the full-bridge inverter circuit diagram of the present utility model.

Fig. 3 is a schematic diagram of the coupling of the transmitting circuit and the receiving circuit of the present invention.

Fig. 4 is the AC-DC conversion circuit diagram of the utility model.

detailed description

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the utility model utilizes the LTC6900 chip to generate two-way reverse PWM waves. Apart from the chip, the circuit consists of only one resistor and one capacitor. The resistor is connected between the power supply V+ pin of the LTC6900 chip and the set pin, and the capacitor is connected between the power supply V+ pin of the LTC6900 chip and the ground terminal GND pin. Get the required PWM wave at the OUT pin of the LTC6900 chip, and then output it through the inverter 74HC04, you can get two reverse PWM waves, one is output by the LTC6900 chip, and the other is output by the 74HC04.

As shown in Figure 2, the utility model utilizes the switching tube IRLU310 to generate an AC drive signal. The switching tube IRLU310 has small on-resistance, short on-time, switching frequency up to 1MHz, and medium power consumption, which can reduce system loss and improve energy transmission efficiency. The full-bridge inverter circuit is composed of four switch tubes, four resistors, and a large capacitor of 2200μF; the G pole and S pole of the four switch tubes D1, D2, D3, and D4 are all passed through a 9.1K resistor connected. The D poles of the switch tubes D1 and D3 are connected to the positive pole of the 15V power supply. The D pole of the switch tube D2 is connected to the S pole of the switch tube D1. The D pole of the switch tube D4 is connected to the S pole of the switch tube D3. The S poles of the switch tubes D2 and D3 are grounded. The positive pole of the power supply is connected to the positive pole of the capacitor C1, and the negative pole of the power supply is connected to the negative pole of the capacitor C1.

The four bridge arms are turned on or off in turn, and the turn-on and cut-off times do not exceed half a cycle. During the alternate turn-on process, the transmitting circuit generates alternating current to realize DC to high-frequency AC conversion. The high-frequency AC signal excites an alternating current in the transmitting loop of the resonant circuit.

As shown in Figure 3, the utility model utilizes two coils (the two coils are equivalent to two 24uH inductors in the figure) and two capacitors to realize magnetic field coupling. The inductance value of the coil needs to match the capacitance value of the application to realize the resonance of the two coils and maximize the output power.

As shown in Figure 4, the utility model transfers the received AC signal to a DC signal, and then connects to the load through an AC-DC circuit. The AC-DC circuit consists of four diodes 1N4001 and one 220μF capacitor. The cathode of the diode D1 is connected to the anode of the diode D4, and then connected to the receiving circuit; the cathode of the diode D2 is connected to the anode of the diode D3, connected to the other end of the receiving circuit, and then grounded. The anode of the diode D1 is connected to the anode of the diode D2, and then connected to one end of the capacitor C0, and the cathode of the diode D4 is connected to the cathode of the diode D3, and then connected to the other end of the capacitor C0. The load R0 in this embodiment is a mobile phone charger. Provide 15V DC power supply, which can realize the wireless charging function of mobile phones.

When in use, align the two coils as much as possible and turn on the DC power supply to realize wireless power transmission. The alignment of the coils and the distance between the two coils affect the efficiency of power transfer.

The above are only preferred embodiments of the present utility model, and are not used to limit the scope of protection of the present utility model. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be Included within the protection scope of the present utility model.

Claims (6)

1. a kind of wireless electric energy transmission device, it is characterised in that：Including the PWM wave generation circuits, the full-bridge inverting electricity that are sequentially connected Road, resonance circuit, AC-DC change-over circuits；The resonance circuit includes launching circuit and receives loop；PWM wave generation circuits drive Dynamic inverter circuit, inverter circuit evokes alternating current in the launching circuit of resonance circuit, by magnetic coupling in resonance circuit Receive and produced on loop sensing alternating current, direct current, driving load are exported by AC-DC change-over circuits.

2. a kind of wireless electric energy transmission device according to claim 1, it is characterised in that:The PWM wave generation circuits bag Include chip LTC6900, phase inverter；It is 50% that chip LTC6900 produces accurate dutycycle, and frequency is the PWM ripples of 130kHz, is produced Raw PWM ripples are obtained the reverse PWM ripples of two-way by phase inverter, and a route LTC6900 chip outputs, another route is anti-phase Device is exported, and the reverse PWM ripples of two-way drive inverter circuit.

3. a kind of wireless electric energy transmission device according to claim 2, it is characterised in that:The full bridge inverter bag Include the electric capacity C1 of four switching tubes, four resistance, 2200 μ F；

A resistance of 9.1K is all connected between four the G poles and S poles of switching tube D1, D2, D3, D4；Switching tube D1 and switching tube The D poles of D3 connect the positive pole of 15V power supplys；The D poles of switching tube D2 are connected with the S poles of switching tube D1；The D poles of switching tube D4 and switching tube The S poles connection of D3；The S poles ground connection of switching tube D2, switching tube D3；The positive pole of power supply is connected with the positive pole of electric capacity C1, power supply it is negative Pole is connected with the negative pole of electric capacity C1.

4. a kind of wireless electric energy transmission device according to claim 3, it is characterised in that:The AC-DC change-over circuits bag Include the electric capacity C0 of 4 diode 1N4001,1 220 μ F；The negative pole of diode D1 is connected with the positive pole of diode D4, Ran Houlian It is connected to reception loop one end；The negative pole of diode D2 is connected with the positive pole of diode D3, is connected to the reception loop other end and is followed by Ground；The positive pole of diode D1 is connected with the positive pole of diode D2, is then attached to one end of electric capacity C0, the negative pole of diode D4 with The negative pole connection of diode D3, is then attached to the other end of electric capacity C0；Load R0 is connected in parallel on the two ends of electric capacity C0.

5. a kind of wireless electric energy transmission device according to claim 4, it is characterised in that:The launching circuit includes string The transmitting coil and electric capacity of connection, the reception loop include the receiving coil and electric capacity of series connection；The launching circuit be received back to The resonant frequency on road is identical；The two ends of launching circuit D poles respectively with switching tube D2, the D poles of switching tube D4 are connected；Receive loop One end be connected between the positive pole of the negative pole of diode D1 and diode D4, the other end is connected to the negative pole and two of diode D2 Between the positive pole of pole pipe D3.

6. a kind of wireless electric energy transmission device according to claim 5, it is characterised in that:The model of the phase inverter 74HC04。