CN204334131U - A kind of electric energy transmitting terminal and wireless electric energy transmission device - Google Patents

Abstract

The utility model discloses a kind of electric energy transmitting terminal and wireless electric energy transmission device, it regulates the current signal of primary coil by current modulating circuit, the electric current flowing through primary coil is made to be the AC signal of constant frequency constant amplitude, when can ensure the whether good or secondary load change of the coupling condition on no matter secondary and former limit like this, former limit transfers to the energy of secondary can not change, can ensure that energy transmission efficiency reaches maximization.Relative to prior art, the utility model without the need to the feedback mechanism of complexity, and can be better than the design of secondary circuit, and the system configuration that the utility model uses is simple, can be applied to comparatively complex environment, and efficiency is high.

Description

A kind of electric energy transmitting terminal and wireless electric energy transmission device

Technical field

The utility model relates to electric and electronic technical field, more particularly, relates to a kind of electric energy transmitting terminal and wireless electric energy transmission device.

Background technology

Wireless power transmission technology is widely used in electronics field due to its convenient and practical feature, at present, the mode realizing wireless power transmission mainly contains magnetic inductive and magnetic resonance type two kinds of modes, magnetic inductive due to by transmission range to limit its application scenario very limited, magnetic resonance type wireless power transmission can realize remote, powerful delivery of electrical energy, can be widely used in electric terminal, electric automobile, under water, the charging of inferior power consumption equipment and power supply.

Magnetic resonance type wireless electric energy transmission device mainly comprises radiating portion and receiving unit, and both realize the maximization of Energy Transfer by electromagentic resonance principle.Be illustrated in figure 1 the circuit block diagram of magnetic resonance type wireless electric energy transmission device, radiating portion includes the resonance structure that former edge emitting coil Ls and resonant capacitance Cs forms, and receiving unit includes the resonance mechanism that secondary receiving coil Ld and resonant capacitance Cd forms.In order to ensure that wireless power can effectively transmit, the resonance point usually requiring the resonance structure of former secondary unanimously or closely, and is denoted as the operating frequency of system.

Magnetic resonance radio energy transmission system primary coil and secondary coil degree of coupling higher time, there will be frequency bifurcation, namely the optimum efficiency point of system or maximum power transfer point can depart from the resonance frequency of system.In order to solve frequency bifurcation, in prior art, there are two kinds of solutions: one is take variable frequency control, when former secondary coil couple variations, carried out optimum efficiency or the maximum power point of tracking system by the operating frequency changing system; Two is the impedance matching networks arranging system, makes system still can be operated in resonant frequency point by changing system parameters.For the control program of frequency conversion, in order to compatible international Electromagnetic Radiation Standards, when being usually only limitted to work for low frequency (usually within 150kHz); During for high-frequency work, usually require that system operating frequency is positioned at ISM band (6.78MHz), and ISM band narrow range, do not allow regulating system operating frequency.

For the control program of impedance matching, a kind of is in Circuits System, need multiple feedback control loop to regulate the voltage bias of the voltage controlled capacitor in match circuit, thus change the capacitance of voltage controlled capacitor, the resonant parameter of adjustment System, thus make to determine frequency work and become possibility, regulated the capacitance of voltage controlled capacitor by real-time reponse system, control system is very complicated, and the voltage controlled capacitor of high pressure involves great expense.As shown in Figure 2, by respectively increasing a coil at former secondary, an input coil, an output winding is (as Lg or L in Fig. 2 for another kind of impedance matching scheme _lshown in), manually adjust the coupled relation of input coil and primary coil, and the coupled relation of output winding and secondary coil changes the impedance matching network of system, manual adjustment then significant discomfort is used for the situation that former secondary relative position exists change and load change.

Utility model content

In view of this, the utility model proposes a kind of new electric energy transmitting terminal and wireless electric energy transmission device, it regulates the current signal of primary coil by current modulating circuit, making is the AC signal of constant frequency constant amplitude by the electric current of primary coil, when can ensure the whether good or secondary load change of the coupling condition on no matter secondary and former limit like this, all can ensure that the efficiency of transmission of energy reaches maximization.

First aspect, according to a kind of electric energy transmitting terminal of the present utility model, in order to the electric energy receiving terminal transmitting energy with its isolation, described electric energy transmitting terminal comprises:

Voltage changer, receives electric energy to export the high-frequency alternating current with predeterminated frequency;

Current modulating circuit, receives described high-frequency alternating current, to obtain adjustment current signal;

Electric energy radiating portion, comprises former edge emitting coil, described former edge emitting coil for receiving described adjustment current signal, with to described electric energy receiving terminal transmitting energy;

Wherein, described predeterminated frequency is the system operating frequency of described electric energy transmitting terminal and electric energy receiving terminal, and described adjustment current signal is the AC signal with constant frequency constant amplitude.

Further, described current modulating circuit is resonant circuit, and the resonance frequency of described resonant circuit is consistent with described predeterminated frequency.

Preferably, described current modulating circuit comprises the resonant circuit be made up of the first inductance and the first electric capacity,

The first end of described first inductance connects the positive output end of described voltage changer, and the second end is connected to the first end of described former edge emitting coil;

The first end of described first electric capacity is connected with the second end of described first inductance, the negative output terminal of voltage changer described in the second termination;

Wherein, described first inductance is consistent with described predeterminated frequency with the resonance frequency of the first electric capacity, and the signal of the points of common connection of described first inductance and the first electric capacity is as described adjustment current signal.

Preferably, described current modulating circuit comprises the resonant circuit of the first inductance and the first electric capacity composition,

The first end of described first electric capacity connects the positive output end of described voltage changer, and the second end is connected to the first end of described former edge emitting coil;

The first end of described first inductance is connected with the second end of described first electric capacity, the negative output terminal of voltage changer described in the second termination;

Wherein, described first inductance is consistent with described predeterminated frequency with the resonance frequency of the first electric capacity, and the signal of the points of common connection of described first inductance and the first electric capacity is as described adjustment current signal.

Further, also comprise the second inductance, the first end of described second inductance connects the second end of described first inductance, and the second end connects the first end of described former edge emitting coil,

Wherein, the inductance value of described second inductance is identical with the inductance value of described first inductance.

Further, also comprise the second electric capacity, the first end of described second electric capacity connects the first end of described first inductance, and the second end connects the negative output terminal of described voltage changer,

Wherein, the capacitance of described second electric capacity is identical with the capacitance of described first electric capacity.

Further, also comprise the 3rd electric capacity, the first end of described 3rd electric capacity connects the second end of described first electric capacity, the first end of former edge emitting coil described in the second termination,

Wherein, the capacitance of described 3rd electric capacity is identical with the capacitance of described first electric capacity.

Further, also comprise the 3rd inductance, the first end of described 3rd inductance connects the first end of described first electric capacity, and the second end connects the negative output terminal of described voltage changer,

Wherein, the inductance value of described 3rd inductance is identical with the inductance value of described first inductance.

Second aspect, according to a kind of wireless electric energy transmission device of the present utility model, comprising:

Voltage changer, receives electric energy to export the high-frequency alternating current with predeterminated frequency;

Current modulating circuit, receives described high-frequency alternating current, to obtain adjustment current signal;

Electric energy radiating portion, comprises former edge emitting coil, and described former edge emitting coil receives described adjustment current signal;

Electric energy receiving unit, comprises secondary receiving coil, and described secondary receiving coil is for receiving the energy from the transmission of electric energy radiating portion;

Wherein, described predeterminated frequency is consistent with the system operating frequency of described wireless electric energy transmission device, and described adjustment current signal is the AC signal with constant frequency constant amplitude.

Further, described current modulating circuit is resonant circuit, and the resonance frequency of described resonant circuit is consistent with described predeterminated frequency.

Preferably, described current modulating circuit comprises the resonant circuit be made up of the first inductance and the first electric capacity,

The first end of described first inductance connects the positive output end of described voltage changer, and the second end is connected to the first end of described former edge emitting coil;

The first end of described first electric capacity is connected with the second end of described first inductance, the negative output terminal of voltage changer described in the second termination;

Wherein, described first inductance consistent with described predeterminated frequency with the resonance frequency of the first electric capacity and, the signal of the points of common connection of described first inductance and the first electric capacity is as described adjustment current signal.

Preferably, described current modulating circuit comprises the resonant circuit be made up of the first inductance and the first electric capacity,

The first end of described first electric capacity connects the positive output end of described voltage changer, and the second end is connected to the first end of described former edge emitting coil;

The first end of described first inductance is connected with the second end of described first electric capacity, the negative output terminal of voltage changer described in the second termination;

Wherein, described first inductance consistent with described predeterminated frequency with the resonance frequency of the first electric capacity and, the signal of the points of common connection of described first inductance and the first electric capacity is as described adjustment current signal.

By above-mentioned electric energy transmitting terminal and wireless electric energy transmission device, utilize current modulating circuit to make the electric current of primary coil for the AC signal of constant frequency constant amplitude, radio energy transmission system of the present utility model has following beneficial effect:

1) in the surrounding space of primary coil, produce the alternating magnetic field of constant frequency constant amplitude, ensure electric energy that former limit transfers to secondary not because of the change as the change in location (namely former secondary coil stiffness of coupling changes) of former secondary coil or the change of load of extraneous variable.

2) by producing the alternating magnetic field of constant frequency constant amplitude, secondary receiving terminal partial design in radio transmitting device is conducive to greatly.

3) owing to producing constant space magnetic field at electric energy transmitting terminal, can realize the corresponding multiple reception adapter ring of single transmitting coil, not interfere with each other mutually between receiving coil, the independence that can realize multiple-channel output controls.

4) the utility model makes system can be operated in fixing frequency, eliminates the complication system of frequency-tracking.Former edge emitting pastern divides not to be needed to adopt complicated feedback mechanism to change the capacitance of voltage controlled capacitor, and system configuration is simplified.The system configuration that the utility model uses is simple, but applied environment that can be more complicated, the change of former secondary coil coupling can be tackled, the change etc. of load.

Accompanying drawing explanation

Figure 1 shows that the circuit block diagram of magnetic resonance type wireless electric energy transmission device;

Figure 2 shows that a kind of implementation of the impedance matching of magnetic resonance type wireless electric energy transmission device of the prior art;

Figure 3 shows that the circuit block diagram of the first embodiment according to wireless electric energy transmission device of the present utility model;

Figure 4 shows that the circuit block diagram of the second implementation according to electric energy transmitting terminal of the present utility model;

Figure 5 shows that the circuit block diagram of the third implementation according to electric energy transmitting terminal of the present utility model;

Figure 6 shows that the circuit block diagram of the 4th kind of implementation according to electric energy transmitting terminal of the present utility model;

Figure 7 shows that the circuit block diagram of the 5th kind of implementation according to electric energy transmitting terminal of the present utility model;

Figure 8 shows that the circuit block diagram of the 6th kind of implementation according to electric energy transmitting terminal of the present utility model.

Embodiment

Below in conjunction with accompanying drawing, several preferred embodiment of the present utility model is described in detail, but the utility model is not restricted to these embodiments.The utility model contain any make on marrow of the present utility model and scope substitute, amendment, equivalent method and scheme.To have the utility model to make the public and understand thoroughly, in following the utility model preferred embodiment, describe concrete details in detail, and do not have the description of these details also can understand the utility model completely for a person skilled in the art.

In addition, it should be understood by one skilled in the art that the accompanying drawing provided at this is all for illustrative purposes, and accompanying drawing is not necessarily drawn in proportion.

Meanwhile, should be appreciated that in the following description, " circuit " refers to the galvanic circle connected and composed by electrical connection or electromagnetism by least one element or electronic circuit.When " being connected to " another element when claiming element or circuit or claiming element/circuit " to be connected to " between two nodes, it can be directly couple or be connected to another element or can there is intermediary element, the connection between element can be physically, in logic or its combine.On the contrary, " be directly coupled to " when claiming element or " being directly connected to " another element time, mean that both do not exist intermediary element.

In description of the present utility model, it is to be appreciated that term " first ", " second " etc. are only for describing object, and instruction or hint relative importance can not be interpreted as.In addition, in description of the present utility model, except as otherwise noted, the implication of " multiple " is two or more.

With reference to the circuit block diagram that Figure 3 shows that the first embodiment according to wireless electric energy transmission device of the present utility model; As shown in Figure 3, described wireless electric energy transmission device comprises mutually isolated electric energy transmitting terminal and electric energy receiving terminal, in the present embodiment, described electric energy transmitting terminal includes voltage changer 1, current modulating circuit 2 and former edge emitting coil Ls and resonant capacitance Cs composition electric energy radiating portion 3; Described electric energy receiving terminal includes secondary receiving coil L _dwith resonant capacitance C _dthe electric energy receiving unit 4 of composition and rectification circuit 5.Here, former limit resonant capacitance Cs and secondary resonant capacitance C _dmight not be needs, when less demanding to circuit parameter or circuit parasitic capacitance is larger when, former limit resonant capacitance Cs and secondary resonant capacitance C _dcan not need.External electric energy is transmitted, through the load of rectifier circuit rectifies treatment and supplied by the electric energy transmitting terminal on the former limit of the wireless electric energy transmission device electric energy receiving terminal to secondary.

Wherein, described voltage changer 1 is specially DC-AC voltage changer, DC-AC voltage changer can be multiple implementation that is of the prior art or that improve, as the bridge type topology of Multi-Switch pipe composition, half-bridge, full-bridge topology etc., or the topological mechanism of Single switch pipe composition, as Class E amplifier, Class Ф amplifier etc., described DC-AC voltage changer receives electric energy to export the high-frequency alternating current Vin with predeterminated frequency, the system operating frequency ω of described predeterminated frequency and described wireless electric energy transmission device ₀unanimously, namely described predeterminated frequency is ω ₀it should be explicitly made clear at this point, the system operating frequency of described wireless electric energy transmission device presets according to circuit structure and efficiency requirements, such as, according to the standard of Alliance for Wireless Power (A4WP), for meeting EMI standard, requirement system operating frequency is 6.78MHz, and according to wireless charging alliance QI standard, General Requirements system operating frequency is 110-205kHz, and user can according to the operating frequency size wanting the self-defined system of control difficulty or ease of summing circuit of standard.

In the present embodiment, described current modulating circuit 2 receives described high-frequency alternating current Vin, obtains the AC signal with constant frequency constant amplitude through modulation treatment, is designated as and regulates current signal Ip.Here, described current modulating circuit is resonant circuit, and the resonance frequency of described resonant circuit is consistent with described predeterminated frequency, that is to say that the resonance frequency of described resonant circuit is consistent with the system operating frequency of wireless electric energy transmission device.In the present embodiment, described current modulating circuit 2 comprises the first inductance L 1 and the first electric capacity C1, and the first end of described first inductance L 1 connects the positive output end of described voltage changer 1, and the second end is connected to the first end of described former edge emitting coil Ls; The first end of described first electric capacity C1 is connected with the second end of described first inductance L 1, the negative output terminal of voltage changer 1 described in the second termination, wherein, and the resonance frequency of described first inductance L 1 and the first electric capacity C1 and described predeterminated frequency ω ₀unanimously, namely have wherein, L is the inductance value of the first inductance, and C is the capacitance of the first electric capacity, and the signal of the points of common connection of described first inductance L 1 and the first electric capacity C1 is as described adjustment current signal Ip.

The procurement process of described adjustment current signal is specifically set forth: the equiva lent impedance Zd of above-mentioned former edge emitting coil Ls, resonant capacitance Cs and secondary coil is designated as magnetic resonance network impedance Zs, then Zs is according to above-mentioned current modulating circuit:

$Z_s={\mathrm{j\ω}}_0{L}_s+Z_d+\frac{1}{{\mathrm{j\ω}}_O{C}_S}---\left(1\right)$

Wherein, Ls is the inductance value of former edge emitting coil, and Cs is the capacitance of former limit resonant capacitance.

According to the introduction of above-mentioned first inductance and the first electric capacity, the impedance defining the first inductance L 1 is: j ω _ol=jX, then the impedance of the first electric capacity C1 is :-jX, can obtain total input impedance Z on former limit according to the circuit relationships of the first inductance, the first electric capacity and magnetic resonance network _infor:

$Z_{\mathrm{in}}=\mathrm{jX}+\frac{Z_s\×(-\mathrm{jX})}{Z_s-\mathrm{jX}}=\frac{X^2}{Z_s-\mathrm{jX}}---\left(2\right)$

If the amplitude of described high-frequency alternating current is Vin, then according to formula (2) can obtain current modulating circuit export adjustment current signal Ip be:

$I_p=\frac{V_{\mathrm{in}}}{Z_{\mathrm{in}}}\frac{-\mathrm{jX}}{Z_s-\mathrm{jX}}=\frac{V_{\mathrm{in}}}{\mathrm{jX}}---\left(3\right)$

As can be seen from formula (3), as resonance frequency and the described predeterminated frequency ω of the first inductance and the first electric capacity ₀time consistent, the amplitude of described adjustment current signal Ip is determined jointly by the impedance of the first inductance L 1 under system operating frequency and input voltage, after the impedance of the first inductance L 1 and input voltage are determined, then described adjustment current signal Ip is the AC signal of constant frequency constant amplitude, and described constant frequency is and described predeterminated frequency ω ₀unanimously.As can be known from Fig. 3, described adjustment current signal Ip is the current signal of described former edge emitting coil, and when former edge emitting coil passes through the alternating current of constant frequency constant amplitude, the alternating magnetic field of constant frequency constant amplitude will be produced in the surrounding space of primary coil, like this, the electric energy receiving terminal of secondary just can receive stable electric flux, the change be not coupled as former secondary coil because of extraneous factor or the change of load and change, and guarantees the maximization of energy transmission efficiency.In addition, it can also be seen that from formula (2), in the present embodiment, total input impedance Z on former limit _inshow as awareness character, the Sofe Switch being conducive to realizing DC-AC voltage changer breaker in middle pipe like this starts.

In addition, can know according to above-mentioned computational process, in the utility model, owing to making the electric current of former edge emitting coil be the alternating current of constant frequency constant amplitude, therefore in magnetic resonance network, the resonance point of Ls and Cs might not require to equal system operating frequency ω ₀, such Cs can be reduced to jumbo capacitance.But in the resonator system of prior art, the resonance point of Ls and Cs of General Requirements magnetic resonance network strictly equals or is in close proximity to system operating frequency, to guarantee effective transmission of energy.This structure containing current modulating circuit is for radio energy transmission system, as long as the resonance frequency presetting L with C of current-modulation network is consistent with system operating frequency, so just do not need to do corresponding change according to different couplings, reduce the control precision requirement for system parameters, overall control difficulty all can reduce with controlling cost.

When one of ordinary skill in the art will readily recognize that resonance frequency in described current modulating circuit is consistent with described system operating frequency, the constant return of electric current is best, and therefore efficiency of transmission is the highest.But also can know by inference according to the utility model, the resonance frequency in current modulating circuit not exclusively equals operating frequency (there is inductance or capacitance parameter error), and constant current effect can slightly decline, but does not affect the high efficiency of wireless charging.Therefore can be found out by the utility model, the error of radio energy transmission system of the present utility model to parameter is insensitive, is very beneficial for batch production.

The first implementation of the electric energy transmitting terminal in wireless electric energy transmission device is described in a upper embodiment, preferably, in another embodiment, described current modulating circuit 2 also comprises the resonant circuit be made up of the first inductance L 1 and the first electric capacity C1, with reference to the circuit block diagram that Figure 4 shows that the second implementation according to electric energy transmitting terminal of the present utility model, in the present embodiment, other parts of described electric energy transmitting terminal and the identical of a upper embodiment, therefore omit in the diagram, same, the circuit of same section describes and function does not repeat them here.In the present embodiment, the impedance of described magnetic resonance network is designated as Zs.

Particularly, in the present embodiment, the first end of described first electric capacity C1 connects the positive output end of described voltage changer, and the second end is connected to the first end of described former edge emitting coil; The first end of described first inductance L 1 is connected with the second end of described first electric capacity, the negative output terminal of voltage changer described in the second termination; Wherein, the resonance frequency of described first inductance L 1 and the first electric capacity C1 and described predeterminated frequency ω ₀unanimously, the signal of the points of common connection of described first inductance L 1 and the first electric capacity C1 is as described adjustment current signal Ip.

Computational process according to above-described embodiment can be known by inference, in the present embodiment, and total input impedance Z on the described former limit of electric energy transmitting terminal _infor:

$Z_{\mathrm{in}}=-\mathrm{jX}+\frac{Z_s\×\mathrm{jX}}{Z_s+\mathrm{jX}}=\frac{X^2}{Z_s+\mathrm{jX}}---\left(4\right)$

The adjustment current signal Ip that can obtain current modulating circuit output according to formula (4) is:

$I_p=\frac{V_{\mathrm{in}}}{z_{\mathrm{in}}}\frac{\mathrm{jX}}{z_s+\mathrm{jX}}=-\frac{V_{\mathrm{in}}}{\mathrm{jX}}---\left(5\right)$

Find out from formula (5), former edge emitting coil in the present embodiment is by the alternating current of constant frequency constant amplitude, therefore in the surrounding space of primary coil, produce the alternating magnetic field of constant frequency constant amplitude, like this, the electric energy receiving terminal of secondary just can receive stable electric flux, not because of the change that extraneous factor is coupled as former secondary coil, the change of load and changing, guarantees the maximization of energy transmission efficiency.

With reference to the circuit block diagram that Figure 5 shows that the third implementation according to electric energy transmitting terminal of the present utility model, in the present embodiment, voltage changer, the current modulating circuit of described electric energy transmitting terminal are identical with the embodiment in Fig. 3 with magnetic resonance network, therefore omit in Figure 5, same, the circuit of same section describes and function does not repeat them here, and circuit numbers is directly quoted hereinafter.In the present embodiment, the impedance of described magnetic resonance network is designated as Zs.

Difference is, in the present embodiment, described electric energy transmitting terminal further comprises the second inductance L 2, the first end of described second inductance L 2 connects the second end of described first inductance L 1, second end connects the first end of described former edge emitting coil, wherein, the inductance value of described second inductance L 2 is identical with the inductance value of described first inductance L 1, then the impedance of described second inductance L 2 is jX.

In the present embodiment, total input impedance Z on former limit can be obtained according to the circuit relationships of the first inductance, the first electric capacity, the second inductance and magnetic resonance network _infor:

$Z_{\mathrm{in}}=\mathrm{jX}+\frac{(Z_s+\mathrm{jX})\×(-\mathrm{jX})}{(Z_s+\mathrm{jX})-\mathrm{jX}}=\frac{x^2}{z_s}---\left(6\right)$

Then can obtain according to the circuit structure relation of formula (6) and Fig. 5 the adjustment current signal Ip that current modulating circuit exports is:

$I_p=\frac{V_{\mathrm{in}}}{Z_{\mathrm{in}}}\frac{-\mathrm{jX}}{(Z_s+\mathrm{jX})-\mathrm{jX}}=\frac{V_{\mathrm{in}}}{\mathrm{jX}}---\left(7\right)$

Find out from formula (7), the alternating current that what the former edge emitting coil in the present embodiment was same is by constant frequency constant amplitude, therefore in the surrounding space of primary coil, produce the alternating magnetic field of constant frequency constant amplitude, like this, the electric energy receiving terminal of secondary just can receive stable electric flux, the change be not coupled as former secondary coil because of extraneous factor or the change of load and change, guarantee the maximization of energy transmission efficiency.

In addition, in the present embodiment, as can be seen from formula (6), when the impedance Z s of magnetic resonance network is pure resistance, the total input impedance Z in former limit of described electric energy transmitting terminal _inalso be pure resistance form, system circulation can be reduced like this, reduce the wastage, thus improve the operating efficiency of whole system further.

With reference to the circuit block diagram that Figure 6 shows that the 4th kind of implementation according to electric energy transmitting terminal of the present utility model, in the present embodiment, voltage changer, the current modulating circuit of described electric energy transmitting terminal are identical with the embodiment in Fig. 3 with magnetic resonance network, therefore omit in figure 6, same, the circuit of same section describes and function does not repeat them here, and circuit numbers is directly quoted hereinafter.In the present embodiment, the impedance of described magnetic resonance network is designated as Zs.

Difference is, in the present embodiment, described electric energy transmitting terminal further comprises the second electric capacity C2, the first end of described second electric capacity C2 connects the first end of described first inductance L 1, second end connects the negative output terminal of described voltage changer, wherein, the capacitance of described second electric capacity C2 is identical with the capacitance of described first electric capacity C1, then the impedance of described second electric capacity C2 is-jX.

In the present embodiment, total input impedance Z on former limit can be obtained according to the circuit relationships of the first inductance, the first electric capacity, the second electric capacity sense and magnetic resonance network _infor:

$Z_{\mathrm{in}}=\frac{-\mathrm{jX}\×\frac{X^2}{Z_s-\mathrm{jX}}}{-\mathrm{jX}+\frac{X^2}{Z_s-\mathrm{jX}}}=\frac{X^2}{Z_s}---\left(8\right)$

Then can obtain according to the circuit structure relation of formula (8) and Fig. 6 the adjustment current signal Ip that current modulating circuit exports is:

$I_p=\frac{V_{\mathrm{in}}}{Z_{\mathrm{in}}}\×\frac{-\mathrm{jX}}{-\mathrm{jX}+\frac{X^2}{Z_s-\mathrm{jX}}}\×\frac{-\mathrm{jX}}{Z_s-\mathrm{jX}}=\frac{V_{\mathrm{in}}}{\mathrm{jX}}---\left(9\right)$

Find out from formula (9), the alternating current that what the former edge emitting coil in the present embodiment was same is by constant frequency constant amplitude, therefore in the surrounding space of primary coil, produce the alternating magnetic field of constant frequency constant amplitude, like this, the electric energy receiving terminal of secondary just can receive stable electric flux, not because of the change that extraneous factor is coupled as former secondary coil, the change of load and changing, guarantees the maximization of energy transmission efficiency.

Same, in the present embodiment, as can be seen from formula (8), when the impedance Z s of magnetic resonance network is pure resistance, the total input impedance Z in former limit of described electric energy transmitting terminal _inalso be pure resistance form, system circulation can be reduced like this, reduce the wastage, thus improve the operating efficiency of whole system further.

With reference to the circuit block diagram that Figure 7 shows that the 5th kind of implementation according to electric energy transmitting terminal of the present utility model, in the present embodiment, voltage changer, the current modulating circuit of described electric energy transmitting terminal are identical with the embodiment in Fig. 4 with magnetic resonance network, therefore omit in the figure 7, same, the circuit of same section describes and function does not repeat them here, and circuit numbers is directly quoted hereinafter.In the present embodiment, the impedance of described magnetic resonance network is designated as Zs.

Difference is, in the present embodiment, described electric energy transmitting terminal further comprises the 3rd electric capacity C3, the first end of described 3rd electric capacity C3 connects second end of described first electric capacity C1, the first end of former edge emitting coil described in second termination, wherein, the capacitance of described 3rd electric capacity C3 is identical with the capacitance of described first electric capacity C1, then the impedance of described second electric capacity C3 is-jX.

In the present embodiment, total input impedance Z on former limit can be obtained according to the circuit relationships of the first inductance, the first electric capacity, the 3rd electric capacity sense and magnetic resonance network _infor:

$Z_{\mathrm{in}}=-\mathrm{jX}+\frac{(Z_s-\mathrm{jX})\×\mathrm{jX}}{(Z_s-\mathrm{jX})+\mathrm{jX}}=\frac{X^2}{Z_s}---\left(10\right)$

Then can obtain according to the circuit structure relation of formula (10) and Fig. 7 the adjustment current signal Ip that current modulating circuit exports is:

$I_p=\frac{V_{\mathrm{in}}}{Z_{\mathrm{in}}}\frac{\mathrm{jX}}{(Z_s-\mathrm{jX})+\mathrm{jX}}=-\frac{V_{\mathrm{in}}}{\mathrm{jX}}---\left(11\right)$

Find out from formula (11), the alternating current that what the former edge emitting coil in the present embodiment was same is by constant frequency constant amplitude, therefore in the surrounding space of primary coil, produce the alternating magnetic field of constant frequency constant amplitude, like this, the electric energy receiving terminal of secondary just can receive stable electric flux, not because of the change that extraneous factor is coupled as former secondary coil, the change of load and changing, guarantees the maximization of energy transmission efficiency.

Same, in the present embodiment, as can be seen from formula (10), when the impedance Z s of magnetic resonance network is pure resistance, the total input impedance Z in former limit of described electric energy transmitting terminal _inalso be pure resistance form, system circulation can be reduced like this, reduce the wastage, thus improve the operating efficiency of whole system further.

With reference to the circuit block diagram that Figure 8 shows that the 6th kind of implementation according to electric energy transmitting terminal of the present utility model, in the present embodiment, voltage changer, the current modulating circuit of described electric energy transmitting terminal are identical with the embodiment in Fig. 4 with magnetic resonance network, therefore omit in fig. 8, same, the circuit of same section describes and function does not repeat them here, and circuit numbers is directly quoted hereinafter.In the present embodiment, the impedance of described magnetic resonance network is designated as Zs.

Difference is, in the present embodiment, described electric energy transmitting terminal further comprises the 3rd inductance L 3, the first end of described 3rd inductance L 3 connects the first end of described first electric capacity C1, second end connects the negative output terminal of described voltage changer, wherein, the inductance value of described 3rd inductance L 3 is identical with the inductance value of described first inductance L 1, then the impedance of described 3rd inductance L 3 is jX.

In the present embodiment, total input impedance Z on former limit can be obtained according to the circuit relationships of the first inductance, the first electric capacity, the 3rd inductance sense and magnetic resonance network _infor:

$Z_{\mathrm{in}}=\frac{\mathrm{jX}\×\frac{X^2}{Z_s+\mathrm{jX}}}{\mathrm{jX}+\frac{X^2}{Z_s+\mathrm{jX}}}=\frac{X^2}{Z_s}---\left(12\right)$

Then can obtain according to the circuit structure relation of formula (12) and Fig. 8 the adjustment current signal Ip that current modulating circuit exports is:

$I_p=\frac{V_{\mathrm{in}}}{Z_{\mathrm{in}}}\×\frac{\mathrm{jX}}{\mathrm{jX}+\frac{X^2}{Z_s+\mathrm{jX}}}\×\frac{\mathrm{jX}}{Z_s+\mathrm{jX}}=-\frac{V_{\mathrm{in}}}{\mathrm{jX}}---\left(13\right)$

Find out from formula (13), the alternating current that what the former edge emitting coil in the present embodiment was same is by constant frequency constant amplitude, therefore in the surrounding space of primary coil, produce the alternating magnetic field of constant frequency constant amplitude, like this, the electric energy receiving terminal of secondary just can receive stable electric flux, not because of the change that extraneous factor is coupled as former secondary coil, the change of load and changing, guarantees the maximization of energy transmission efficiency.

Same, in the present embodiment, as can be seen from formula (13), when the impedance Z s of magnetic resonance network is pure resistance, the total input impedance Z in former limit of described electric energy transmitting terminal _inalso be pure resistance form, system circulation can be reduced like this, reduce the wastage, thus improve the operating efficiency of whole system further.

It should be noted that; the multiple implementation of the electric energy transmitting terminal in wireless electric energy transmission device is described in the various embodiments described above; but those skilled in the art are known; the structure that can realize the described electric energy transmitting terminal of above-mentioned functions is not limited to this; there is the design of identical utility model, the circuit of identical function can be realized all within protection range of the present utility model.

The electric energy transmitting terminal of each above-mentioned embodiment is not limited to in radio energy transmission system, such as, load impedance Zd can be purely resistive or contain perception (capacitive) induction reactance, also can be the load being connected directly between primary coil, can also be coupled by secondary coil, and be refracted to the equiva lent impedance on former limit.

Carried out detailed description to according to a kind of electric energy transmitting terminal of preferred embodiment of the present utility model and wireless electric energy transmission device above, those of ordinary skill in the art can know other technologies or structure and circuit layout, element etc. accordingly by inference and all can be applicable to described embodiment.

According to embodiment of the present utility model as described above, these embodiments do not have all details of detailed descriptionthe, do not limit the specific embodiment that this utility model is only described yet.Obviously, according to above description, can make many modifications and variations.This specification is chosen and is specifically described these embodiments, is to explain principle of the present utility model and practical application better, thus makes art technical staff that the utility model and the amendment on the utility model basis can be utilized well to use.The utility model is only subject to the restriction of claims and four corner and equivalent.

Claims (12)

1. an electric energy transmitting terminal, in order to the electric energy receiving terminal transmitting energy with its isolation, described electric energy transmitting terminal comprises:

Voltage changer, receives electric energy to export the high-frequency alternating current with predeterminated frequency;

Current modulating circuit, receives described high-frequency alternating current, to obtain adjustment current signal;

Electric energy radiating portion, comprises former edge emitting coil, described former edge emitting coil for receiving described adjustment current signal, with to described electric energy receiving terminal transmitting energy;

Wherein, described predeterminated frequency is consistent with the system operating frequency of described electric energy transmitting terminal and electric energy receiving terminal, and described adjustment current signal is the AC signal with constant frequency constant amplitude.

2. electric energy transmitting terminal according to claim 1, is characterized in that, described current modulating circuit is resonant circuit, and the resonance frequency of described resonant circuit is consistent with described predeterminated frequency.

3. electric energy transmitting terminal according to claim 2, is characterized in that, described current modulating circuit comprises the resonant circuit be made up of the first inductance and the first electric capacity,

The first end of described first inductance connects the positive output end of described voltage changer, and the second end is connected to the first end of described former edge emitting coil;

The first end of described first electric capacity is connected with the second end of described first inductance, the negative output terminal of voltage changer described in the second termination;

Wherein, described first inductance is consistent with described predeterminated frequency with the resonance frequency of the first electric capacity, and the signal of the points of common connection of described first inductance and the first electric capacity is as described adjustment current signal.

4. electric energy transmitting terminal according to claim 2, is characterized in that, described current modulating circuit comprises the resonant circuit of the first inductance and the first electric capacity composition,

The first end of described first electric capacity connects the positive output end of described voltage changer, and the second end is connected to the first end of described former edge emitting coil;

The first end of described first inductance is connected with the second end of described first electric capacity, the negative output terminal of voltage changer described in the second termination;

Wherein, described first inductance is consistent with described predeterminated frequency with the resonance frequency of the first electric capacity, and the signal of the points of common connection of described first inductance and the first electric capacity is as described adjustment current signal.

5. electric energy transmitting terminal according to claim 3, is characterized in that, further comprises the second inductance, and the first end of described second inductance connects the second end of described first inductance, and the second end connects the first end of described former edge emitting coil,

Wherein, the inductance value of described second inductance is identical with the inductance value of described first inductance.

6. electric energy transmitting terminal according to claim 3, is characterized in that, further comprises the second electric capacity, and the first end of described second electric capacity connects the first end of described first inductance, and the second end connects the negative output terminal of described voltage changer,

Wherein, the capacitance of described second electric capacity is identical with the capacitance of described first electric capacity.

7. electric energy transmitting terminal according to claim 4, is characterized in that, further comprises the 3rd electric capacity, and the first end of described 3rd electric capacity connects the second end of described first electric capacity, the first end of former edge emitting coil described in the second termination,

Wherein, the capacitance of described 3rd electric capacity is identical with the capacitance of described first electric capacity.

8. electric energy transmitting terminal according to claim 4, is characterized in that, further comprises the 3rd inductance, and the first end of described 3rd inductance connects the first end of described first electric capacity, and the second end connects the negative output terminal of described voltage changer,

Wherein, the inductance value of described 3rd inductance is identical with the inductance value of described first inductance.

9. a wireless electric energy transmission device, comprising:

Voltage changer, receives electric energy to export the high-frequency alternating current with predeterminated frequency;

Current modulating circuit, receives described high-frequency alternating current, to obtain adjustment current signal;

Electric energy radiating portion, comprises former edge emitting coil, and described former edge emitting coil receives described adjustment current signal;

Electric energy receiving unit, comprises secondary receiving coil, and described secondary receiving coil is for receiving the energy from the transmission of electric energy radiating portion;

Wherein, described predeterminated frequency is consistent with the system operating frequency of described wireless electric energy transmission device, and described adjustment current signal is the AC signal with constant frequency constant amplitude.

10. wireless electric energy transmission device according to claim 9, is characterized in that, described current modulating circuit is resonant circuit, and the resonance frequency of described resonant circuit is consistent with described predeterminated frequency.

11. wireless electric energy transmission devices according to claim 10, is characterized in that, described current modulating circuit comprises the resonant circuit be made up of the first inductance and the first electric capacity,

The first end of described first inductance connects the positive output end of described voltage changer, and the second end is connected to the first end of described former edge emitting coil;

The first end of described first electric capacity is connected with the second end of described first inductance, the negative output terminal of voltage changer described in the second termination;

Wherein, described first inductance is consistent with described predeterminated frequency with the resonance frequency of the first electric capacity, and the signal of the points of common connection of described first inductance and the first electric capacity is as described adjustment current signal.

12. wireless electric energy transmission devices according to claim 10, is characterized in that, described current modulating circuit comprises the resonant circuit be made up of the first inductance and the first electric capacity,

The first end of described first electric capacity connects the positive output end of described voltage changer, and the second end is connected to the first end of described former edge emitting coil;

The first end of described first inductance is connected with the second end of described first electric capacity, the negative output terminal of voltage changer described in the second termination;

Wherein, described first inductance is consistent with described predeterminated frequency with the resonance frequency of the first electric capacity, and the signal of the points of common connection of described first inductance and the first electric capacity is as described adjustment current signal.