CN205882861U - Simple and easy wireless charging device based on electromagnetic induction - Google Patents

Abstract

The utility model discloses a simple and easy wireless charging device based on electromagnetic induction, including emission module and receiving module, wherein power transformer, LM2596 voltage stabilizing module, frequency oscillation circuit, MOS pipe power amplifier circuit, LC oscillation circuit, transmitting coil that emission module connects including the order, receiving coil, half -wave rectifier circuit, LM7805 voltage stabilizing circuit that receiving module links to each other including the order, LM7805 voltage stabilizing circuit output direct current charges to the load. The utility model discloses a charging device, structural design is simple, and charge efficiency is high.

Description

A kind of Simple wireless charging device based on electromagnetic induction

Technical field

This utility model relates to wireless charging field, particularly to a kind of Simple wireless based on electromagnetic induction charging dress Put.

Background technology

Making constant progress of current social, portable panel computer, media player, smart mobile phone etc. needs power supply Electronic equipment is universal increasingly wider many people and in the case of mobile Internet, all become convenient and swift.But ought be outward Going out and meet dead battery, electronic equipment is have more than is needed, and so good days state has been broken and hindered society's life of high speed development Live, therefore go out to can be carried out wireless charging whenever and wherever possible and just become the most necessary.

On the other hand, wireless charging technology can reduce because family has a lot of electronic equipment, and charging wire is many and causes electric wire Numerous and diverse, produce the hidden dangers such as electric leakage or short circuit, wireless charging technology can also reduce the charging port of electronic equipment Damage, improve the life-span of electronic equipment, the most also reduce the production of charger, play environmental protection effect, it is also possible to reduce me And 220V alternating current mediate contact.

Certainly for the research of wireless charging technology, while greatly developing, environmental protection, energy-conservation and safe etc. each Aspect accomplishes not waste, and does not pollute and avoids human body to cause bad impact.

Research wireless charging know-why has four kinds the most at home and abroad, is induction (Magnetic respectively Induction), radio waves (Radio Reception), magnetic resonance type (Resonance) and field coupling formula (Capacitive coupling)。

One, induction (Magnetic Induction)

Up to the present, induction is that wireless charging is universal the widest, and the technology of comparative maturity comes from mikey the earliest That-faraday finds electromagnetic induction phenomenon in the 1830's, and producing induction electromotive force is the change due to magnetic flux, therefore Electric wire has electric current to pass through.Induction transmission exactly has coil with receiving terminal, and a certain size electric current passes through transmitting coil, Then by electromagnetic induction principle, produce electromotive force at receiving coil, produce electric current at receiving terminal.Resonance controls, through-put power High-effect and transmission data are as the Kernel Technology of induction wireless charging.Induction advantage is in short distance When wireless charging, converting electrical energy efficiency is the highest.

Two, radio waves (Radio Reception)

The charging principle of radio waves is to receive radio wave with electronic equipment, has used the ore deposit similar in appearance to early application The wireless ultimate principle of stone, ingredient has Microwave emission module and microwave receiving module, and the development of its technology is relative to it His comparative maturity.For Jian Dan, as long as transmitter is positioned on wall body plug, also can load onto any voltage electrics for one " mosquito type " receptor, capture from hindering the radio wave that fires back of thing to receive circuit by micro high efficiency, allow it change into Galvanic current pressure.Classical example be exactly the sixties in 20th century of Blang (William C.Brown) by microwave source, transmitting and The microwave power transmission system of reception antenna composition, wherein has in microwave source and can control source at the 2.45GHz frequency range certain power of output Magnetron, 64 gaps antenna array composition launch installation, have 25% conversion and collection efficiency reception equipment. Powercast company just can use radio waves principle that in distance RF, consumption electronic product is broadcasted farthest several meters 2007 Place carry out wireless charging.Can be seen that the benefit of radio waves be can more remote wireless charging, can reach 10 meters, but Be its shortcoming be exactly inefficiency, only about 38%, power is little, needs long-time charging, and a lot of energy waste.

Three, magnetic resonance type (Resonance)

Magnetic resonance type has energy to send and receives two parts device composition, and principle is when delivery and reception module is adjusted to same One frequency, or resonance is in the frequency of a regulation, both devices just can intercourse energy, is similar to sound Sound resonates, also referred to as near field resonant mode.One team of america's MIT, under Marin professor Soljacic leads research and development, utilizes Electromagentic resonance achieves wireless charging, and the research staff of Intel company was at electricity consumption mr techniques in 2008, and a 60W sends out Light device distance in this state provides the position of general one meter of voltage source to have 75% transmission energy efficiency ground luminous, in this success Basis under, they hint the laptop computer of special handling is charged by challenge mr techniques by wireless device.From A lot of reality uses example, and such as when charging, the position at place there is no need very accurate, needs higher transmission electricity merit Rate, the problem mr techniques such as long-distance sand transport energy can be preferably corresponding, so this technology is used in a lot of field now, The most electronic new forms of energy car, medical treatment and military equipment, but the poor efficiency of this technology and safety and Health problem limit magnetic resonance The further development of technology, these problems need to solve further.

Four, field coupling formula (Capacitive coupling)

Field coupling formula is made up of power transmission side and power side, and power transmission side is called " agitator ", and power side is called " load ", so The electric field that the electrode of rear utilization both sides is formed is to produce electricity.Field coupling wireless charging technology has three big characteristics, and being respectively can Charging with free position, electrode is the thickest, will not raise in the temperature being charged electrode portion.1. can charge with free position: electricity Although a manifold type is less than the magnetic resonance type distance wireless charging up to ten meters, but this angle is permissible in the horizontal direction There is the freedom of higher position, it is simply that user can be wireless while can using electronic equipment on the position providing charging Charging, uses panel computer the most in bed, as long as there being field coupling technology to provide the position of charging just can carry out wireless under bed Charging, adds convenience and safety.2. electrode is the thickest: this feature meets the requirement of broad masses the most very much, and electrode surpasses Level is thin, can be put in a lot of electronic equipments, and not affect composition and the distribution of electronic equipment internal structure, beats a ratio Side, a panel computer the thinnest, as long as it is square to load onto 1.6cm, the electrode of thick 6 μm just can realize field coupling formula wireless charging Electricity, did not both affect the appearance, the most convenient.3. the when of charging, the temperature in electrode portion will not raise: present smart mobile phone meeting Run into the situation of charging heating, having this athermic electrode, even if being arranged near battery, being caused going bad by battery-heating The probability degenerated is the lowest.But it is the lowest that the shortcoming of field coupling formula is exactly through-put power, below 10W, limitation is big.

To sum up analyzing and understand, induction is that wireless charging is universal the widest, the technology of comparative maturity, and electromagnetic induction The advantage of formula is that converting electrical energy efficiency is the highest when short-distance wireless charges, and it is the most prompt easy to use.List of references " Yang Hui. wireless phone charging [D]. Tianjin University of Technology and Education .2014 (06). " it is to use induction carrying out equally Wireless charging, it is mainly by the module (transmitter module) signaled, transmission signaling module (transport module) and reception signaling module (receiver module) three parts are constituted, flow chart such as Fig. 1.With a small-sized transformator, the alternating current of 220V is become direct current Electricity, adds an adjustable resistance to regulate the size of output voltage, it is possible to adjustable between 0～20；One is done with four diodes Rectifier bridge reaches the purpose of rectification；Electricity container is filtered again, through this series of conversion, is defeated by other modules；Connect And deliver to coil after power amplification circuit amplifies, then by the coupling coil electromagnetic induction of receiver module, induce electric current Carrying out a series of rectifying and voltage-stabilizing, stable flowing to the most again loads, and finally realizes the purpose of wireless charging later.Described in the document The shortcoming of technical scheme is that circuit design is more complicated, and relatively costly, error rate is bigger.

It is therefore desirable to design a kind of new wireless charging device based on electromagnetic induction to meet demand.

Utility model content

The purpose of this utility model is that the shortcoming overcoming prior art is with not enough, it is provided that a kind of letter based on electromagnetic induction Easily wireless charging device.

The purpose of this utility model is realized by following technical scheme:

A kind of Simple wireless charging device based on electromagnetic induction, including transmitter module and receiver module, wherein said Penetrate mains transformer that module includes being linked in sequence, LM2596 Voltage stabilizing module, frequency oscillation circuit, metal-oxide-semiconductor power amplifier, LC shake Swing circuit, transmitting coil；Described receiver module include order be connected receiving coil, half-wave rectifying circuit, LM7805 voltage stabilizing electricity Road, described LM7805 mu balanced circuit output unidirectional current is to load charging.

Described Simple wireless charging device based on electromagnetic induction, also includes analog-to-digital conversion module, display module, its middle mold Number conversion module converts analog signals into digital signal, and result is shown on display module, and described display module is LCD1602 display screen.

Described Simple wireless charging device based on electromagnetic induction, also includes charge protector.

Described charge protector includes reed switch relay.

This utility model compared with prior art, has the advantage that and beneficial effect:

List of references " Yang Hui. wireless phone charging [D]. Tianjin University of Technology and Education .2014 (06). " as connecing most Near prior art, is called for short documents one, below for documents one, describes advantage of the present utility model in detail:

One, on the whole:

Table 1

Two, from the selection of transmitting terminal design:

First transmitting terminal has household voltage 220V alternating current by power supply, becomes the unidirectional current of 12V, and contrived experiment plate has out Close and control whether transmitting terminal works, display whether to be operated by LED, if bright, represent that transmitting terminal is started working, instead It, do not work.It is suitable that transmitting terminal work first passes through that LM2596, LM2596 blood pressure lowering chip is mainly used in required for offer system Voltage, such as NE555, IRF540 driving chip, transmitting coil etc..Then utilize NE555 to produce square wave and produce pulse, allow it produce Raw Pulse Power Magnification is to 36.7KHz (because by testing when 36.7K frequency, can reach peak efficiency), metal-oxide-semiconductor IRF540 As signaling switch, allow square wave produce LC oscillating circuit, then produce pulse and transfer the energy to transmitting coil.

In the design process, from documents one gained, transmitter module comprises power management module circuit, hunting of frequency mould Block circuit and power amplifier module circuit three part.The alternating current of alternating current 220V is mainly become for equipment by power module The unidirectional current of 5V.With transformator T1, the electricity of 220V is become the unidirectional current of 5V, then the rectifier bridge D1 through four diode compositions The electric current diminished by transformator carries out rectification, then by two electric capacity U3, U4 is filtered, then by the voltage stabilizing electricity being made up of LM7805 Road carries out voltage stabilizing, finally flows to load.

This utility model mainly uses the frequency oscillation circuit being made up of NE555, and the signal generator of composition sends Frequency be used for power amplifier provide one trigger signal, with switching tube (TFR840) and capacitor and inductor parallel connection resonant tank Constitute power amplifier.The difference at transmitting terminal with documents one is as shown in table 2:

Table 2

LM2596 is a kind of chip, plays switching mode integrated voltage-stabilized effect.Its core contains: agitator (150KHZ), base Quasi-mu balanced circuit (1.23v), Themral-shutdown circuit, Current limit circuit etc..

LM2596 advantage:

1, the minimum 1.2V of voltage adjustable extent, it is 37V that maximum bears voltage, fixed voltage output be respectively 3.3V, 5V, 12V；

2, maximum output current 3A；

3, frequency of oscillation is 150KHz；

4, the second switching regulator is belonged to；

5, few consumption, high efficiency；

6, conversion effect is up to 88%；

7, operating temperature-40～+125 degrees Celsius；

Can obtain from each data, LM2596 scalable loads, and possesses overheated and current-limiting protection function, and output linearity is outstanding Function, so meeting design.

LM2596 has five pins altogether, such as table 3:

Table 3 pin function table

LM259 pin	Function
		No. 1 pin	+ VIN (connects positive source)
No. 2 pins	Out put (connects positive source)
		No. 3 pins	GND (ground wire)
No. 4 pins	Feed back (feedback effect)
		No. 5 pins	On/off (checks whether work)

Three, from the selection of receiving terminal design:

Receiving coil receives the energy of transmitting coil by electromagnetic induction phenomenon, obtains one by filtering and halfwave rectifier More stable high voltage, by L7805, obtains a stable 5V unidirectional current, supplies 51 single-chip microcomputers, model STC89C52 and Load uses, by two chip A of ADC0832, TLC5615 conversion between D, add LM324 amplifier effect, will whether enter Row charging and charged battery voltage are in LCD1602 liquid crystal display screen display.

In documents one, it is such for having individual design, receives circuit by receiving coil, rectification circuit, voltage stabilizing Electric capacity etc. are constituted.Receiving to be easier to realization and launch generation resonance, the electric capacity of receiving coil parallel connection should with transmitting coil also The capacitance size of connection is the same.In order to obtain galvanic current supply load, due to receiving coil receive be exchange Voltage, it is necessary to the rectification circuit BR1 of four diode compositions in figure.Export by the electrochemical capacitor parallel connection of 3 47000uF Become, so can obtain more galvanic current.

Being to have used half-wave rectifying circuit in place of the advantage of the design, design is simple, it is not necessary to tap, and reduces and set Meter cost, diode usage quantity only needs one, and simple to operate, material object is easily worked it out, convenient easily operation.

Halfwave rectifier be a kind of utilize diode can only be from a specific side to the opposing party, it is not possible to characteristic in turn Carry out the most common circuit of rectification, remove the sine wave of negative half, the method for rectifying that output positive half is sinusoidal wave, cry half Ripple rectification.Unidirectional current to be had, it is necessary to carry out rectification, changes alternating current.Because the unidirectional current of output is arteries and veins after halfwave rectifier Dynamic unidirectional current, being used in is not the highest to voltage request, as long as in stable circuit.

The design selects half-wave rectifying circuit, because in half-wave rectifying circuit, the direction voltage that diode bears is the lowest, makes Number of diodes have only to one, cost-saving, circuit is simple, adds that several electric capacity does the effect filtered, can obtain one Individual more stable high voltage, it is possible to achieve follow-up design.The difference such as table 4 that this utility model designs with receiving terminal.

Table 4

So in realizing voltage stabilizing pressure reduction, the design selects chip L7805 and half-wave rectifying circuit, capacitor filtering is made With, it is achieved one simple, easily realizes burning voltage, supply load and as supply module to sensor network nodes module Scheme.

Accompanying drawing explanation

Fig. 1 is the structural representation of a kind of Simple wireless charging device based on electromagnetic induction described in the utility model.

Detailed description of the invention

Below in conjunction with embodiment and accompanying drawing, this utility model is described in further detail, but enforcement of the present utility model Mode is not limited to this.

A kind of Simple wireless charging device based on electromagnetic induction, including transmitter module and receiver module, wherein said Penetrate mains transformer that module includes being linked in sequence, LM2596 Voltage stabilizing module, frequency oscillation circuit, metal-oxide-semiconductor power amplifier, LC shake Swing circuit, transmitting coil；Described receiver module include order be connected receiving coil, half-wave rectifying circuit, LM7805 voltage stabilizing electricity Road, described LM7805 mu balanced circuit output unidirectional current is to load charging.

Described Simple wireless charging device based on electromagnetic induction, also includes analog-to-digital conversion module, display module, its middle mold Number conversion module converts analog signals into digital signal, and result is shown on display module, and described display module is LCD1602 display screen.

Described Simple wireless charging device based on electromagnetic induction, also includes charge protector.

Described charge protector includes reed switch relay.

It is further detailed the technique effect of technical solutions of the utility model and feasible below with object test Property:

One, test prepares

1, first checking for the feasibility of material object, observe whether circuit board welds successfully, whether electric wire welds, available general-purpose Table test circuit board whether short circuit or open circuit；

2, lithium battery is ready to；

3, MSP Single Chip Microcomputer (SCM) program is successfully write in single-chip microcomputer；

4, to install EZ soft for test computer.

Early-stage preparations are good, can carry out object test.

Two, object test one

Object test one, as shown in table 5, controls to launch constant with the distance of receiving coil, and two coils are placed in parallel, and change Become the area of the coincidence of two coils.Testing for convenience, the distance of two two circles is O.

Table 5 object test one table

Test result analysis: when coil 1/2nd overlaps time, it is possible to achieve charge function, single-chip microcomputer can normal work Make, it is possible to be that sensor network nodes normally works as supply module.When less than half when, display lamp is bright, but electric Press the lowest, not enough so that single-chip microcomputer normally works, and cannot to provide voltage be sensor network nodes work.When distance is enough The when of remote, not carrying out energy transmission, receiving terminal does not has voltage.

Three, object test two

Object test two, such as table 6, the overlapping area keeping two coils is the same, and overlapping area is at 1 to four/2nds points Three between, two coils keep balance, change the distance between two coils.

Table 6 object test two table

Test result analysis: when the distance of two coils is less than 10CM, and the voltage that receiving terminal produces can make single-chip microcomputer Normal work, it is also possible to supply electricity to sensor network nodes work as supply module.Two coil distances are at 10CM to 15CM Voltage can be produced apart from interior, but voltage is the lowest, is not enough to loaded work piece.When coil distance is more than 15CM, launches and connect Take-up circle does not has energy to transmit, and does not produce electromagnetism and thanks to phenomenon.

Four, object test three

Object test three keeps two coil overlapping area and distance all in the range of single-chip microcomputer can normally work, and changes Two coils angle.

Table 7 object test three table

Test result analysis: when two coil angles are below 80 degree, it is possible to supply electricity to single-chip microcomputer work normally and make Sensor network nodes work is supplied electricity to for power module.When more than 80 degree, the energy of two coil transmission is less, it is impossible to give negative Carry normal work.When two coils are vertical when, it is impossible to produce electromagnetic induction phenomenon.

Five, it is charged for lithium battery

It is charged lithium battery normally working by single-chip microcomputer, so the intersection of coil must be more than half.Lithium Battery charging measurement table is shown in Table 8.

Table 8 lithium cell charging test table

Test result analysis: in LCD display: 0:4.0V N:0.0V 0, represents charging voltage respectively, the voltage of battery, Whether it is charged.Charging voltage can be increased or decreased charging voltage by control knob, reaches as high as 5V；O represents not Having charging or charge complete, 1 expression is charged.

Six, sum up

Induction technology has been that one is used a lot, the wireless energy transmission technology that development is the most ripe.Comprehensively Consider inductive energy transmission technology, adopt the coupling between transmitting coil and receiving coil, complete energy by electromagnetic induction and pass Defeated, it is achieved wireless charging, the pcb board of final design novelty is tested, and sensor network nodes is soft by eZ430-RF2500 Part can realize function, shows the information of node on PC, this node reliable operation, stable, adopts the energy management skill of uniqueness Art, market application foreground is wide.Achieve can sense by wireless charging by wireless charging device and sensor network nodes module The function of device network node.

Above-described embodiment is this utility model preferably embodiment, but embodiment of the present utility model is not by above-mentioned The restriction of embodiment, other any without departing from the change made under spirit of the present utility model and principle, modify, replace In generation, combine, simplify, all should be the substitute mode of equivalence, within being included in protection domain of the present utility model.

Claims (4)

1. a Simple wireless charging device based on electromagnetic induction, it is characterised in that: include transmitter module and receiver module, its Described in transmitter module include being linked in sequence mains transformer, LM2596 Voltage stabilizing module, frequency oscillation circuit, metal-oxide-semiconductor power amplifier Circuit, LC oscillating circuit, transmitting coil；Described receiver module include order be connected receiving coil, half-wave rectifying circuit, LM7805 mu balanced circuit, described LM7805 mu balanced circuit output unidirectional current is to load charging.

Simple wireless charging device based on electromagnetic induction the most according to claim 1, it is characterised in that: also include that modulus turns Die change block, display module, wherein analog-to-digital conversion module converts analog signals into digital signal, and result is shown at display mould On block, described display module is LCD1602 display screen.

Simple wireless charging device based on electromagnetic induction the most according to claim 1, it is characterised in that: also include charger Protection circuit.

Simple wireless charging device based on electromagnetic induction the most according to claim 3, it is characterised in that: described charge protection Circuit includes reed switch relay.