CN203312922U

CN203312922U - Wireless charger

Info

Publication number: CN203312922U
Application number: CN2013201432342U
Authority: CN
Inventors: 薛明; 刘�东; 李阳
Original assignee: Tianjin Polytechnic University
Current assignee: Tianjin Polytechnic University
Priority date: 2013-03-27
Filing date: 2013-03-27
Publication date: 2013-11-27
Anticipated expiration: 2023-03-27
Also published as: CN103151851A

Abstract

The utility model discloses a design of a wireless charger. The wireless charger mainly comprises two parts: a transmitting device including a sine-signal generating circuit, a signal amplification circuit and a transmitting coil; and a receiving device including a receiving coil, a bridge rectification circuit. The charger comprises two parts which are independent of each other in space so that after 5V voltage is input into the transmitting device, the receiving device is capable of receiving electrical energy through coupling of space electromagnetic fields. Therefore, the charger is capable of working stably. The wireless charger overcomes a current situation that traditionally wires of chargers are exposed outside so that the chargers lack beauty. The wireless charger is designed through use of a wireless power transmission technology so that not only beauty of life is improved but people are also kept away from dangers brought by the wires. The wireless charger has the advantages of being safe, convenient and fast and flexible to use so that the wireless charger is an environment-friendly energy.

Description

Wireless charger

Technical field

The wireless power transmission technology, as a kind of new electric energy transmission technology, makes people in the electrification life, break away from the constraint of electric wire.Wireless power transmission is exactly the transmission that the Applied Physics principle has realized the non-radiation type wireless energy, namely the resonance object of two same frequencys will produce very strong intercoupling, and with object away from the resonance environment have weak mutual, thereby resonance occurs between two articles, realized the transmission of electric energy.

The utility model is the direct application to the wireless power transmission technology, by emitter, receiving device, two-part design, makes wireless charger energy steady operation, for people's life has brought convenience.Realized the technical concept of wireless penetration and the energy-conserving and environment-protective of delivery of electrical energy.

Background technology

Since the mankind entered the electric era, life just again be unable to do without electricity, and due to the restriction of electrical power storage technology, our electrification life is always fettered by a wire.The length of electric wire has become the radius of people's lives, and electric wire becomes the mankind's chains again.And the meaning of the realization of electric power Radio Transmission Technology is self-evident.

The utility model wireless charger has utilized the wireless power transmission technology exactly, makes people away from the danger that electric wire brings, have safe, convenient, use advantage flexibly, be a kind of environmental protection energy.It can be applicable to various fields, and such as travelling, office, family life etc. will be widely used in the near future.

Summary of the invention

Technical problem to be solved in the utility model is that the life for people provides portable, flexible, a green wireless charging device.It is comprised of emitter and receiving system two parts, emitter: comprise sinusoidal signal generation circuit (2), signal amplification circuit (3), transmitting coil (4); Receiving system: comprise receiving coil (5) and bridge rectifier (6); By these two parts, can make the wireless charger normal operation, wherein, this two-part annexation is: sinusoidal signal generation circuit (2) is connected with signal amplification circuit (3); Signal amplification circuit (3) is connected with transmitting coil (4); Receiving coil (5) is connected with bridge rectifier (6); Bridge rectifier (6) is connected with electronic equipment.

The technical solution adopted in the utility model is:

Chip MAX038 produces sinusoidal signal.

Amplifying circuit offset of sinusoidal signal based on BLF175 amplifies.

Transmitting coil and receiving coil design parameter are diameter 200mm, wire diameter 0.8mm, and the number of turn 8 circle, the coil resonance frequency is 9MHz, two coil generation coupled resonances are realized the wireless transmission of energy.

Adopt bridge rectifier to carry out rectification to the interchange of receiver side, thereby the output direct current signal is to electronic equipment.

Whole design system is composed as follows: emitter: comprise sinusoidal signal generation circuit (2), signal amplification circuit (3), transmitting coil (4); Receiving device: comprise receiving coil (5), circuit of synchronous rectification (6).

The function that the utility model will be realized is: by whole system input 5V voltage, be the electronic equipment charging of output, realize the electronic equipment charging without electric wire.

The accompanying drawing explanation

Fig. 1 is the whole frame of design system;

Fig. 2 is based on the signal generating circuit of MAX038;

Fig. 3 is based on the amplifying circuit of BLF175;

Fig. 4 is transmitting coil;

Fig. 5 is receiving coil;

Fig. 6 is bridge rectifier.

Embodiment

Below in conjunction with example and accompanying drawing, the utility model wireless charger is described in detail.

As shown in Figure 2, chip MAX038 is by the 5V power voltage supply, output frequency can be determined by capacity, reference current IIN and the frequency adjustment voltage VFADJ of external oscillating capacitor COSC, be connected on REF (+2.5V) and the variable resistor RF adjustable frequency between FADJ, the parameter of the utility model design is as figure, exportable frequency range is 0.1MHz～28MHz sinusoidal signal, and the output amplitude of waveform is 2V (P-P).

As shown in Figure 3, based on the wide-band linearity amplifier of BLF175, operating frequency range is at 1.6～28 megahertzes, system impedance 50 Ω.Can the sine wave of MAX038 output be amplified, the power output of output is 30W PEP, can effectively reduce the intermodulation distortion that transistorized nonlinear transmission characteristic causes.Thereby, the sine wave amplified is offered to transmitting coil.

As shown in Figure 4, transmitting coil (4), design parameter is diameter 200mm, wire diameter 0.8mm, the number of turn 8 circles, can release thus the coil resonance frequency is 9MHz.The incoming frequency of tuning transmitting coil is 9M, makes, between transmitting coil and receiving coil, coupled resonance occurs.Thereby, guaranteed that the distance of Energy Transfer is maximum, most effective.

As shown in Figure 5, receiving coil (5), design parameter is identical with transmitting coil (4).Exportable alternating voltage is to circuit of synchronous rectification.

As shown in Figure 6, bridge rectifier (6), adopt fast recovery diode RF102 to form, its end also is connected to the filter circuit that R1, C1 form, alternating current is become to direct current, finally access LM7812 three-terminal voltage-stabilizing module, thus the 5V direct voltage of stable output.

In sum: emitter is connected the 5V power supply, and the frequency of conditioning signal generator output is 9MHz, can realize the wireless charging to electronic equipment by transmitting coil, receiving coil and the rectification circuit of design, thereby makes the electronic equipment charging more convenient.

Claims

1. wireless charger, is characterized in that being provided with: emitter: comprise sinusoidal signal generation circuit (2), signal amplification circuit (3), transmitting coil (4); Receiving system: comprise receiving coil (5) and bridge rectifier (6); By these two parts, can make the wireless charger normal operation, wherein, this two-part annexation is: sinusoidal signal generation circuit (2) is connected with signal amplification circuit (3); Signal amplification circuit (3) is connected with transmitting coil (4); Receiving coil (5) is connected with bridge rectifier (6); Bridge rectifier (6) is connected with electronic equipment.

2. wireless charger according to claim 1, it is characterized in that, design by described circuit (2) chips MAX038 and peripheral circuit, output frequency can be determined by capacity, reference current IIN and the frequency adjustment voltage VFADJ of external oscillating capacitor COSC, be connected on the variable resistor RF adjustable frequency between REF and FADJ, its regulating frequency scope is wide, speed is fast, precision is high, but practical function: reference frequency output is 0.1MHz～28MHz sinusoidal signal, and the output amplitude of waveform is 2V.

3. wireless charger according to claim 1, it is characterized in that, in described amplifying circuit (3), take the wide-band linearity amplifier of BLF175 as core, input signal is the sinusoidal signal that amplitude is less, by anti-interference capacitor C1, be connected with transformer T1, then by capacitance C2, be connected with the BLF175 main circuit, output is connected to C5, filter circuit and anti-interference capacitor C9 that L4 forms, but practical function: the sine wave to MAX038 output amplifies, the power output of output is 30W PEP, can effectively reduce the intermodulation distortion that transistorized nonlinear transmission characteristic causes.

4. wireless charger according to claim 1, it is characterized in that, described transmitting coil (4) and receiving coil (5), design parameter is diameter 200mm, wire diameter 0.8mm, the number of turn 8 circles, can release thus the coil resonance frequency is 9MHz, but practical function: the incoming frequency of tuning transmitting coil is 9M, makes, between transmitting coil and receiving coil, coupled resonance occurs.

5. wireless charger according to claim 1, it is characterized in that, described bridge rectifier (6), adopt fast recovery diode RF102 to form, by LM7812 three-terminal voltage-stabilizing module, thus the 5V direct voltage of stable output, but practical function: the direct current signal of stable output, for power electronic equipment, make it normal operation.