A kind of wireless charging device and wireless charging method applied to the double loads of electric carTechnical field
The invention belongs to wireless charging technical fields, more particularly, to a kind of wireless charging applied to the double loads of electric carElectric installation and wireless charging method.
Background technique
The mode of electric car charging has contact charging and contactless two kinds of charging.Electric automobile charging pile is more at presentIt is charged using contact.It charges compared to contact, contactless charging has reduction cable cost, reduces route internal resistance heat wasteThe advantages that consuming, avoiding interface mechanical wear.In addition, wireless charging can be realized intelligent automatic control, operate more easy.CauseThis, electric car wireless charging has great significance to the development of electric car with universal.
Currently, wireless electric vehicle charging device is directed to one-to-one charging mostly, since electric car charging needs centainlyTime significantly increases the demand of electric automobile charging pile.For battery-super capacitor mixed energy storage system, the twoCharge requirement is different, if needing to complete the wireless of battery and super capacitor in order using common one-to-one charging methodCharging, it is inconvenient.
Therefore, to solve the above problems, it is desirable to provide a kind of new wireless charging device and wireless charging sideMethod.
Summary of the invention
The first purpose of this invention is, for deficiency present in background technique, provides a kind of applied to electronic vapourThe wireless charging device of the double loads of vehicle.
For this purpose, above-mentioned purpose of the invention is achieved through the following technical solutions:
A kind of wireless charging device applied to the double loads of electric car, which is characterized in that described to be applied to electric carThe wireless charging device of double loads includes AC power source, loosely coupled transformer and rectification filtering unit；The loosely coupled transformerIncluding transmitting terminal, the first receiving end and the second receiving end；The transmitting terminal is connected to AC power source, first receiving end andTwo receiving ends are respectively connected to the first rectification filtering unit and the second rectification filtering unit, first rectification filtering unit andThe output end of two rectification filtering units is respectively connected to the load of the first electric automobile rechargeable battery and the second electric car charging electricityPond load.
While by adopting the above technical scheme, the present invention can also be used or be combined using technology further belowScheme:
Preferably, the AC power source exports the voltage source being combined by two component sine waves, and two justThe working frequency of string wave component is different.
Preferably, the intrinsic frequency of the first receiving end and the second receiving end of loosely coupled transformer respectively with alternating currentThe working frequency of two component sine waves in source is identical, and the intrinsic frequency of the transmitting terminal of loosely coupled transformer is between AC power sourceBetween the working frequency of two component sine waves.
Second object of the present invention is, for deficiency present in background technique, provides a kind of applied to electronic vapourThe wireless charging method of the double loads of vehicle.
For this purpose, above-mentioned purpose of the invention is achieved through the following technical solutions:
A kind of wireless charging method applied to the double loads of electric car, it is described applied to the wireless of the double loads of electric carCharging method is included: and is included: alternating current based on the previously described wireless charging device applied to the double loads of electric carSource exports the voltage source being combined by two component sine waves, and the working frequency of two component sine waves is different, andWorking frequency is denoted as f respectively1And f2；The intrinsic frequency of first receiving end of loosely coupled transformer and the second receiving end respectively with friendshipThe working frequency of two component sine waves in galvanic electricity source is identical, and the intrinsic frequency of the transmitting terminal of loosely coupled transformer is between alternating currentBetween the working frequency of two component sine waves in source；According to the frequency selective characteristic of wireless charging, the f of AC power source1ComponentEfficiency of transmission to the energy of the first receiving end is much higher than the second receiving end, the f of AC power source2Energy of the component to the second receiving endThe efficiency of transmission of amount is much higher than the first receiving end, passes through each frequency point in alternating current source unified configuration and regulation AC power sourceThe amplitude of amount can be realized and carry out wireless charging to two electric vehicle charging loads, and fill in the realization of alternating current source to twoThe control of electrical load power distribution.
Wireless charging device realizes that the principle of double load charge controls is as follows:
Definition AC power source is UsSin (2 π ft), when two receiving ends are located at power supply two sides, between two receiving endsCoupling can approximation ignore.The energy transmission efficiency ratio of two loads are as follows:
Wherein, ηL1And ηL2Respectively indicate the energy transmission efficiency of two charging loads, PL1And PL2Two charging loads respectivelyPower, M1Indicate the mutual inductance of transmitting terminal and the first receiving end, M2Indicate the mutual inductance of transmitting terminal and the second receiving end, r1And r2PointThe internal resistance of the first receiving end and the second receiving end, r are not indicated1+Req1Indicate the first equivalent resistance for receiving end loop, r2+Req2TableShow the equivalent resistance of the second reception end loop, f1And f2It respectively indicates the first reception end loop and second and receives the intrinsic of end loopFrequency,WithIt respectively indicates the first reception end loop and second and receives the circuit Q of end loopFactor, L1And L2Respectively indicate the self-induction of the first receiving end and the second receiving end.
The transmission characteristic and mutual inductance parameter of double load resonant formula radio energy transmission systems, quality factor of circuit and frequency are inclinedCondition of shifting one's love is related.Particularly, working frequency f1When, load 1 obtains a large amount of transimission power, when working frequency is f2When, big portionDivide power that will be transferred to 2 sides of load.
According to the principle of stacking of circuit, the power that load-side receives can be regarded as by multi-frequency voltage source difference componentThe sum of bearing power of transmission.For a compound electric potential source Us1sin(2πf1t)+Us2sin(2πf2T), power supply component Us1sin(2πf1T) electric energy transmitted is mainly received by load 1, and Us2sin(2πf2T) energy transmitted is mainly received by load 2.Pass throughThe amplitude of two frequency power source components is adjusted, unified regulation can be carried out to bearing power distribution in source side.
Compared with the prior art, the invention has the advantages that:
1) wireless electric vehicle charging device can be realized the wireless power transmission to double loads, save the construction of charging pileCost；
2) control method of wireless electric vehicle charging device can be realized the wireless power transmission to double loads, and charging is negativeLoad can charge simultaneously, save the charging time；
3) control method of wireless electric vehicle charging device is realized in alternating current source by frequency separation method to eachThe power distributed controll of load, easy to operate, collection control performance is good.
Detailed description of the invention
Fig. 1 is the schematic diagram of the wireless charging device provided by the present invention applied to the double loads of electric car.
Fig. 2 a-2b is the simulation result diagram of wireless charging method provided by the present invention.
Specific embodiment
The present invention is described in further detail referring to the drawings and specific embodiments.
Fig. 1 is the schematic diagram of the wireless charging device provided by the present invention applied to the double loads of electric car.Such as Fig. 1 instituteShow, wireless charging device includes AC power source, loosely coupled transformer and rectification filtering unit.
AC power source 1 connects the transmitting terminal 21 of loosely coupled transformer 2, and receiving end 1 receives transmitting terminal 21 by wireless transmissionAlternating electromagnetic field energy, DC current signal is obtained by rectification filtering unit 3, the DC current signal act on load electricityElectrical automobile battery 1.Receiving end 2 receives alternating electromagnetic field energy of the transmitting terminal 21 by wireless transmission, passes through rectification filtering unit 5DC current signal is obtained, which acts on load batteries of electric automobile 2.
AC power source is combined by the sinusoidal voltage source of different frequency (being denoted as f1 and f2 respectively).Receiving end 1 and receptionThe intrinsic frequency at end 2 is identical as the frequency of AC power source component respectively, and the intrinsic frequency of transmitting terminal is between two AC power sources pointBetween the frequency of amount.According to the frequency selective characteristic of wireless charging, the transmission of the energy of the f1 component of AC power source to receiving end 1Efficiency is much higher than receiving end 2, and the efficiency of transmission of the energy of the f2 component of AC power source to receiving end 2 is much higher than receiving end 1, exchangesThe amplitude of each frequency component of power supply can be realized in the unified configuration of source side and regulation to two electric car charging loadsWireless charging, and realize in power end to two charging load power distributed controlls.
The present invention also provides a kind of control methods of wireless electric vehicle charging device, and AC power source is by different frequencyThe sinusoidal voltage source of (being denoted as f1 and f2) is combined.The intrinsic frequency of receiving end 1 and receiving end 2 respectively with AC power source componentFrequency it is identical, the intrinsic frequency of transmitting terminal is between the frequency of two AC power source components.For a compound electric potential sourceUs1sin(2πf1t)+Us2sin(2πf2T), power supply component Us1sin(2πf1T) electric energy transmitted mainly (that is to say electricity by load 1Electrical automobile battery 1) it receives, and Us2sin(2πf2T) energy transmitted is mainly connect by loading 2 (that is to say batteries of electric automobile 2)It receives.By adjusting the amplitude of two frequency power source components, unified regulation can be carried out to bearing power distribution in source side.
The embodiment of the present invention has carried out simulating, verifying to the control method of wireless electric vehicle charging device.The embodimentThe simulator built is as described below:
AC power source is Us, and two sinusoidal voltage source component frequencies are respectively f1=3kHz and f2=5kHz, and transmitting terminal is solidHaving frequency is 4kHz, and 1 intrinsic frequency of receiving end is 3kHz, and 2 intrinsic frequency of receiving end is 5kHz.Rectification filtering unit is used and is not controlledRectification, LC filtering, load is using the pure resistor load of two 5 Ω come the power characteristic of the short charging interval of equivalent energy-storage battery.
In this embodiment, the control method of wireless electric vehicle charging device specifically: adjustment AC power source sine waveThe amplitude combinations of component measure the charging voltage and charging current variation of two loads.
Obtained simulation result is shown in that Fig. 2 a-2b, Fig. 2 a-2b are the simulation result of wireless charging method provided by the present inventionFigure, the various combination of power supply component will lead to the difference of load-side power distribution.AC power source is expressed as U in Fig. 2 as=24sin(2πf1t)+24sin(2πf2t)；AC power source is expressed as U in Fig. 2 bs=24sin (2 π f1t)+12sin(2πf2t)；In Fig. 2 aIn, the reception frequency phase-difference very little of two loads, and the amplitude for reducing f2 power supply component can make load 1 obtain greater proportionTransimission power, i.e., as shown in Figure 2 b.
Above-mentioned specific embodiment is used to illustrate the present invention, is merely a preferred embodiment of the present invention, rather than to thisInvention is limited, and within the spirit of the invention and the scope of protection of the claims, to any modification of the invention made, is equalReplacement, improvement etc., both fall within protection scope of the present invention.