CN105098844A - Noncontact power transmission device and power transmission method - Google Patents
Noncontact power transmission device and power transmission method Download PDFInfo
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- CN105098844A CN105098844A CN201510393831.4A CN201510393831A CN105098844A CN 105098844 A CN105098844 A CN 105098844A CN 201510393831 A CN201510393831 A CN 201510393831A CN 105098844 A CN105098844 A CN 105098844A
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Abstract
The invention discloses a noncontact power transmission device and a power transmission method. A rectifier and filter circuit is used for receiving high-frequency alternating current which is output by a receiving coil; a direct current voltage signal is obtained after full-bridge rectifying and filtering processing; when the condition that the direct current voltage after rectifying and filtering exceeds a preset value is detected, a current loop is formed by a switch protection circuit, an impedance matching circuit and the receiving coil, so that the energy of the receiving coil is transferred until the direct current voltage descends to a value which does not exceed the preset voltage value; the switch protection circuit is connected between an impedance matching network and the ground; when the power transmission device normally works, the switch protection switch does not work; and when the overvoltage condition is generated, the switch protection circuit carries out a switch motion to reduce the value of the direct current voltage.
Description
Technical field
The present invention relates to wireless charging field, in particular, relate to a kind of non-contact electric energy transmission device and method of electric energy transfer.
Background technology
Transmitting non-contact electric energy technology (being also wireless power transmission technology) is widely used in electronics charging field due to advantages such as safe readies, the mode realizing wireless power transmission mainly contains magnetic inductive and magnetic resonance type two kinds of modes, usually conventional is magnetic resonance type, magnetic resonance type wireless electric energy transmission device mainly comprises radiating portion and receiving unit, and both realize Energy Transfer by electromagentic resonance principle.
In general, radiating portion includes inverter, impedance matching circuit and transmitting coil, receiving unit includes receiving coil, impedance matching circuit, rectification circuit (for full-bridge rectification) and DC voltage converting circuit (DC-DC converter), non-contact electric energy transmission device as shown in Figure 1, in Fig. 1, radiating portion only illustrates transmitting coil, transmitting coil L
sreceiving alternating current generation frequency is ω
0alternating magnetic field, receiving coil L
dinducing frequency is ω
0alternating voltage V
sin(ω
0), afterwards, alternating voltage Vsin compensates through full bridge rectifier rectification and filter capacitor C to obtain direct voltage V
rect.
In the process, as receiving coil L
dwith transmitting coil L
swhen being coupled, the alternating voltage amplitude that receiving coil generates is higher; When being coupled difference, the alternating voltage amplitude that receiving coil generates is lower.Therefore, in order to induce the direct voltage V of maximum amplitude at receiving terminal
rect, the inductance L resonance frequency of building-out capacitor C and receiving terminal coil is set in frequencies omega
0on.
Such as, but in delivery of electrical energy process, because the coupling of transmitting coil and receiving coil can change, the magnetic field energy in coupling enhancing suddenly or transmitting coil increases suddenly, and this will cause the direct voltage V after full bridge rectifier
rectexceed preset value, excessive voltage can damage the DC-DC converter of rear class, or even the electronic equipment of load-side.
Summary of the invention
In view of this; the present invention proposes a kind of non-contact electric energy transmission device and method of electric energy transfer; when detecting that the direct voltage after rectifying and wave-filtering exceedes preset voltage value; wherein a part and the receiving coil of switch protecting circuit, impedance matching network is utilized to form a loop; the energy of receiving coil is made not flow to the rectifier circuit of rear class, until direct voltage returns to be no more than preset voltage value.
According to a kind of non-contact electric energy transmission device of the present invention; comprise radiating portion and the receiving unit of isolation; described radiating portion includes the transmitting coil of emitted energy; the receiving coil that described receiving unit includes received energy, the impedance matching network, current rectifying and wave filtering circuit and the voltage conversion circuit that are connected with described receiving coil successively; described receiving unit also comprises switch protecting circuit and overvoltage control circuit
Described impedance matching network comprises the first impedance circuit and the second impedance circuit, between the first end that described first impedance circuit and the second impedance circuit are connected in series in described receiving coil and current rectifying and wave filtering circuit;
Described current rectifying and wave filtering circuit receives the high-frequency alternating current that described receiving coil exports, to obtain d. c. voltage signal;
Described switch protecting circuit comprises the first switch and second switch, first polar end of described first switch is connected to the points of common connection of described first impedance circuit and the second impedance circuit, second polar end is held with being connected to, first polar end of described second switch is connected to the second end of described receiving coil and the points of common connection of current rectifying and wave filtering circuit, and the second polar end is held with being connected to;
Described overvoltage control circuit receives described d. c. voltage signal and reference voltage signal, produces the on off state that switch controlling signal controls described first switch and second switch, is no more than preset voltage value to make described d. c. voltage signal.
Preferably, described current rectifying and wave filtering circuit comprises full bridge rectifier and filter capacitor, and described full bridge rectifier receives the high-frequency alternating current of described receiving coil, to be converted to sinusoidal half-wave voltage signal, described filter capacitor receives described sinusoidal half-wave voltage signal, to obtain d. c. voltage signal.
Further, described full bridge rectifier comprise be connected in series the first diode, the second diode and the 3rd diode be connected in series, the 4th diode, two pairs of diodes be connected in series are connected in parallel again, and the public connecting end of described first diode and the 3rd diode exports described sinusoidal half-wave voltage signal; The public connecting end of described second diode and the 4th diode connects earth terminal;
Described second impedance circuit is connected to the points of common connection of described first diode and the second diode.
Further, described impedance matching network also comprises the 3rd impedance circuit, and described 3rd impedance circuit is connected in series between the second end of described receiving coil and current rectifying and wave filtering circuit;
Further, the first polar end of described second switch is connected to the second end of described receiving coil and the points of common connection of the 3rd impedance circuit.
Preferably, described 3rd impedance circuit is connected to the points of common connection of described 3rd diode and the 4th diode.
Further, described overvoltage control circuit specifically comprises sample circuit and hysteresis comparator,
D. c. voltage signal described in described sampling circuit samples, to obtain sampled voltage signal;
Described hysteresis comparator receives described sampled voltage signal and characterizes the reference voltage signal of described preset voltage value, exports described switch controlling signal,
When described sampled voltage signal is greater than the upper voltage limit value of described hysteresis comparator, described switch controlling signal is that effective status is to control described first switch and second switch conducting simultaneously; When described sampled voltage signal is less than the lower voltage limit value of described hysteresis comparator, described switch controlling signal is disarmed state to control described first switch and second switch turns off simultaneously.
Preferably, described first impedance circuit and the second impedance circuit are respectively the first electric capacity and the second electric capacity,
Equivalent capacity after the first electric capacity described in described non-contact electric energy transmission device course of normal operation and the second capacitances in series and the equivalent inductance resonance of described receiving coil, and resonance frequency is consistent with system operating frequency.
Preferably, described first impedance circuit, the second impedance circuit and the 3rd impedance circuit are respectively the first electric capacity, the second electric capacity and the 3rd electric capacity,
Equivalent capacity after the first electric capacity described in described non-contact electric energy transmission device course of normal operation, the second electric capacity and the 3rd capacitances in series and the equivalent inductance resonance of described receiving coil, and resonance frequency is consistent with system operating frequency.
Further, described voltage conversion circuit receives the d. c. voltage signal of described current rectifying and wave filtering circuit transmission, by exporting suitable voltage swing supply electronic equipment after direct voltage conversion.
Preferably, described first switch and second switch are field-effect transistor.
According to a kind of transmitting non-contact electric energy method of the present invention, be applied in non-contact electric energy transmission device, described non-contact electric energy transmission device comprises radiating portion and the receiving unit of isolation, described radiating portion includes the transmitting coil of emitted energy, described receiving unit includes the receiving coil of received energy, the impedance matching network be connected with described receiving coil successively and current rectifying and wave filtering circuit, comprises the following steps:
Receive the high-frequency alternating current that described receiving coil exports, to obtain d. c. voltage signal;
Detect the value of described d. c. voltage signal, when described d. c. voltage signal is greater than preset voltage value, the switch protecting circuit of the first switch and second switch composition is utilized to control the energy of described receiving coil, to make energy not flow to described current rectifying and wave filtering circuit, until described d. c. voltage signal is no more than preset voltage value;
Wherein, described impedance matching network comprises the first impedance circuit and the second impedance circuit, between the first end that described first impedance circuit and the second impedance circuit are connected in series in described receiving coil and current rectifying and wave filtering circuit;
First polar end of described first switch is connected to the points of common connection of described first impedance circuit and the second impedance circuit, second polar end is held with being connected to, first polar end of described second switch is connected to the second end of described receiving coil and the points of common connection of current rectifying and wave filtering circuit, and the second polar end is held with being connected to;
Preferably, described impedance matching network also comprises the 3rd impedance circuit, and described 3rd impedance circuit is connected in series between the second end of described receiving coil and current rectifying and wave filtering circuit;
Further, the first polar end of described second switch is connected to the second end of described receiving coil and the points of common connection of the 3rd impedance circuit.
Further, described first switch and second switch are by the action of switch controlling signal control switch, and the step that described switch controlling signal produces comprises:
To sample described d. c. voltage signal, to obtain sampled voltage signal;
Receive the reference voltage signal of described sampled voltage signal and the described preset voltage value of sign, and carry out stagnant chain rate comparatively, to export described switch controlling signal;
When described sampled voltage signal be greater than stagnant chain rate compared with upper voltage limit value time, described switch controlling signal is effective status to control described first switch and second switch conducting simultaneously; When described sampled voltage signal be less than described stagnant chain rate compared with lower voltage limit value time, described switch controlling signal is disarmed state to control described first switch and second switch turns off simultaneously.
Preferably, described current rectifying and wave filtering circuit comprises full bridge rectifier and filter capacitor, and described full bridge rectifier receives the high-frequency alternating current of described receiving coil, to be converted to semifocal chord positive wave voltage signal, described filter capacitor receives described semifocal chord positive wave voltage signal, to obtain d. c. voltage signal.
Preferably, the equivalent capacity of impedance matching network and the equivalent inductance resonance of described receiving coil described in described non-contact electric energy transmission device course of normal operation, and resonance frequency is consistent with system operating frequency.
By above-mentioned non-contact electric energy transmission device and transmission method, current rectifying and wave filtering circuit receives the high-frequency alternating current that described receiving coil exports, after full-bridge rectification, filtering process, obtain d. c. voltage signal, described d. c. voltage signal supplies electronic equipment after the conversion of rear class direct voltage.When detecting that the direct voltage after rectifying and wave-filtering exceedes preset voltage value; switch protecting circuit, the first impedance circuit and receiving coil is utilized to form a current circuit; to make the energy of receiving coil not flow to rectifier bridge, until current/voltage returns to be no more than predetermined value.Wherein, switch protecting circuit is connected between impedance matching network and ground, and when power transfer normally works, described switch protecting circuit does not work, and when overpressure situation occurs, described switch protecting circuit carries out switch motion to reduce the value of direct voltage.Technical scheme of the present invention well solves the problem of electric voltage over press in full-bridge rectification situation, and control program is simple, effective.
Accompanying drawing explanation
The basic circuit diagram of the non-contact electric energy transmission device shown in Fig. 1;
Figure 2 shows that the circuit block diagram of the first embodiment according to non-contact electric energy transmission device of the present invention;
Figure 3 shows that the circuit block diagram of the second embodiment according to non-contact electric energy transmission device of the present invention;
Figure 4 shows that embodiment circuit diagram embodiment illustrated in fig. 3;
Figure 5 shows that the working waveform figure of circuit shown in Fig. 4.
Embodiment
Below in conjunction with accompanying drawing, several preferred embodiment of the present invention is described in detail, but the present invention is not restricted to these embodiments.The present invention contain any make on marrow of the present invention and scope substitute, amendment, equivalent method and scheme.To have the present invention to make the public and understand thoroughly, in the following preferred embodiment of the present invention, describe concrete details in detail, and do not have the description of these details also can understand the present invention completely for a person skilled in the art.
With reference to the circuit block diagram that Figure 2 shows that the first embodiment according to non-contact electric energy transmission device of the present invention, as shown in Figure 2, described non-contact electric energy transmission device comprises radiating portion and the receiving unit of isolation, and described radiating portion includes the transmitting coil L of inverter (not shown), impedance matching network (not shown) and emitted energy
s, described receiving unit includes the receiving coil L of received energy
d, impedance matching network, current rectifying and wave filtering circuit and the DC converting circuit 201 that be connected with described receiving coil successively, described current rectifying and wave filtering circuit receives the high-frequency alternating current that described receiving coil exports, to obtain d. c. voltage signal V
rect, DC converting circuit 201 receives described d. c. voltage signal V
rect, after voltage transitions, export suitable voltage swing supply electronic equipment.
Concrete, in the present embodiment, described current rectifying and wave filtering circuit comprises full bridge rectifier and filter capacitor C, described full bridge rectifier receives the high-frequency alternating current of described receiving coil, to be converted to sinusoidal half-wave voltage signal, described filter capacitor receives described sinusoidal half-wave voltage signal, to obtain d. c. voltage signal, concrete, as shown in Figure 2, described full bridge rectifier comprises the first diode D1, the second diode D2 that are connected in series and the 3rd diode D3 be connected in series, the 4th diode D4, and two are connected in parallel the diode be connected in series again; The public connecting end of described first diode D1 and the 3rd diode D3 exports described sinusoidal half-wave voltage signal; The public connecting end of described second diode D2 and the 4th diode D4 connects earth terminal.
Further, as shown in Figure 2, impedance matching network comprises the first impedance circuit and the second impedance circuit, between the first end that described first impedance circuit Z1 and the second impedance circuit Z2 is connected in series in described receiving coil and current rectifying and wave filtering circuit.Here, remember that described receiving coil upper end is first end, lower end is the second end, but is not limited thereto, and also can be first end is lower end, and the second end is upper end.First end described in the present invention or the second end be not as the restriction to receiving coil output.Here, the equivalent capacity of described first impedance circuit and the second impedance circuit and the equivalent inductance resonance of described receiving coil, and resonance frequency is consistent with system operating frequency.
Further, described switch protecting circuit comprises the first switch S 1 and second switch S2, and in fig. 2, the first polar end of described first switch S 1 is connected to the points of common connection of the first impedance circuit Z1 and the second impedance circuit Z2, the second polar end ground connection; First polar end of described second switch S2 is connected to the second end of described receiving coil and the points of common connection of current rectifying and wave filtering circuit, the second polar end ground connection.In Fig. 2, described first switch S 1 and second switch S2, for field-effect transistor, due to the second polar end (being namely the source electrode) ground connection of the first switch and second switch, are altogether with the voltage conversion circuit of rear class and electronic equipment, source voltage is stablized, and is easy to drive.Easy understand, described first switch S 1 and second switch S2 are not limited to above-mentioned field-effect transistor, can also be switching tube suitable in prior art, as single-pole double-throw switch (SPDT) etc.
Continue with reference to figure 2, the first switch S 1 and second switch S2 control its switch motion by overvoltage control circuit 202, and overvoltage control circuit 202 receives described d. c. voltage signal V
rect1with reference voltage signal V
ref1, produce switch controlling signal V
concontrol the on off state of the first switch S 1 and second switch S2, be no more than preset voltage value to make described d. c. voltage signal.
As can be seen from the circuit in Fig. 2, in above-mentioned non-contact electric energy transmission device course of normal operation, first switch and second switch keep turning off, and the equivalent capacity of impedance matching network and the inductance of receiving coil with system operating frequency resonance, thus carry out wireless energy transfer with maximal efficiency; And when described non-contact electric energy transmission device occurs abnormal; d. c. voltage signal raises; the present invention controls the switch motion of the first switch and second switch by overvoltage control circuit; make the energy of receiving coil by being shifted by the loop of receiving coil, the first impedance circuit and switch protecting circuit; direct voltage is declined, returns to below preset voltage value.
With reference to the circuit block diagram that Figure 3 shows that the first embodiment according to non-contact electric energy transmission device of the present invention, current rectifying and wave filtering circuit in the present embodiment, voltage conversion circuit, switch protecting circuit and overvoltage control circuit are all identical with embodiment shown in Fig. 2, difference is, in the present embodiment, described impedance matching network also comprises the 3rd impedance circuit Z3 further, and described 3rd impedance electricity Z3 road is connected in series between the second end of described receiving coil and current rectifying and wave filtering circuit; Further, the first polar end of described second switch is connected to the second end of described receiving coil and the points of common connection of the 3rd impedance circuit.
Compare with the embodiment shown in Fig. 2, employing three impedance matching circuits of the present embodiment can make the first switch S 1 resistance to pressure relatively reduce, and reduce switch cost.
With reference to the embodiment circuit diagram that Figure 4 shows that embodiment shown in Fig. 3, present embodiment specifically have received the specific implementation of impedance matching circuit and overvoltage control circuit, as shown in Figure 4, described first impedance circuit, the second impedance circuit and the 3rd impedance circuit are respectively the first electric capacity C1, the second electric capacity C2 and the 3rd electric capacity C3.First polar end of the first switch S 1 is connected to the points of common connection of the first electric capacity C1 and the second electric capacity C2, and first polar end of described second switch S2 is connected to the second end of described receiving coil and the points of common connection of described 3rd electric capacity C3.Accordingly, the capacitance of described first electric capacity C1, the second electric capacity C2 and the 3rd electric capacity C3 is set to suitable value, to make at work, the efficiency of wireless transmission is the highest, be such as the equivalent capacity after the first electric capacity described in described non-contact electric energy transmission device course of normal operation, the second electric capacity and the 3rd capacitances in series and the equivalent inductance resonance of described receiving coil, and resonance frequency is consistent with system operating frequency.
In the present embodiment, the first impedance circuit be connected in series between the first end of described receiving coil and current rectifying and wave filtering circuit and the second impedance circuit, the 3rd impedance circuit is connected in series between second end of described receiving coil and current rectifying and wave filtering circuit, easy understand, the execution mode of impedance circuit also has other multiple various combinations, such as, the first end of described receiving coil and the second end and two or more impedance circuit of all connecting between current rectifying and wave filtering circuit, as long as finally meet the equivalent capacity of impedance matching network and the equivalent inductance resonance of described receiving coil, and resonance frequency is consistent with system operating frequency.
Here, when the electric capacity quantity of the first impedance circuit and the second impedance circuit changes, the polar end link position also respective change of the first switch and second switch, such as, when the first end of described receiving coil and the second end with all connect between current rectifying and wave filtering circuit two electric capacity time, then described first switch and described second switch are all connected to the points of common connection of respective two electric capacity.Those skilled in the art are known, and under the guidance of the technology of the present invention, impedance matching network and switch protecting circuit have multiple combination mode and corresponding connected mode, and the improvement in thought range of the present invention and replacement, all within protection scope of the present invention.
The impedance circuit of the present embodiment is for electric capacity, and those skilled in the art are known, and impedance circuit can also combine separately or mutually formation for components and parts such as inductance, electric capacity, resistance, requires as long as meet above-mentioned resonance.
With reference to figure 4, overvoltage control circuit 202 in present embodiment specifically comprises sample circuit and hysteresis comparator, sample circuit is made up of divider resistance R1 and resistance R2, hysteresis comparator is made up of resistance R3, resistance R4 and comparator CMP, and divider resistance R1 and resistance R2 samples described d. c. voltage signal V
rect, to obtain sampled voltage signal V
rect1; The positive input of described hysteresis comparator receives described sampled voltage signal V
rect1, reverse input end receives the reference voltage signal V characterizing described preset voltage value
ref1, export described switch controlling signal Vcon, described switch controlling signal controls the first switch S 1 and second switch S2 conducting simultaneously or shutoff.
Set forth the course of work of overvoltage protection of the present invention below with reference to the oscillogram shown in Fig. 5: in the t1 moment, external condition changes, causing d. c. voltage signal to occur abnormal, constantly rising, in the t2 moment, when described sampled voltage signal V being detected
rect1when being greater than the upper voltage limit value of described hysteresis comparator, characterize d. c. voltage signal and exceed preset value, at this moment, the switch controlling signal that described comparator CMP exports is that effective status (such as shows for effective status with high level, low level is shown for disarmed state), first switch S 1 and second switch S2 conducting simultaneously, receiving coil L
d, the first electric capacity C1, the first switch S 1 and second switch S2 form a current circuit, at this moment, because the equivalent inductance of the first electric capacity C1 and receiving coil resonance can not occur, the energy of the transmission of receiving coil can reduce greatly, electric current in current circuit can not be very large, and the energy that receiving coil exports can not transfer to current rectifying and wave filtering circuit, d. c. voltage signal V
rectstart to decline, when dropping to the t3 moment, described sampled voltage signal V
rect1when being less than the lower voltage limit value of described hysteresis comparator, described switch controlling signal becomes disarmed state described first switch S 1 of control and second switch S2 turns off simultaneously.The energy of receiving coil transfers to current rectifying and wave filtering circuit again, if abnormal conditions also exist, then and d. c. voltage signal V
rectcontinue to rise, until when arriving the upper voltage limit value of hysteresis comparator, the first switch S 1 and second switch S2 are switched on, and make d. c. voltage signal V
rectdecline, so repeatedly, until to the t4 moment, circuit abnormality situation is removed, d. c. voltage signal V
rectdrop to and be no more than preset voltage value.
As can be seen from said process; when described non-contact electric energy transmission device occurs abnormal; output voltage can be caused to raise; cause the infringement to voltage conversion circuit or electronic equipment; therefore; the present invention prevents the infringement to late-class circuit, carries out overvoltage protection control by the output voltage signal detecting current rectifying and wave filtering circuit to carrying out output voltage.The wireless electric energy transmission device with over-voltage protecting function of the present invention; better more galvanic current pressure signal can be obtained by full bridge rectifier; and overvoltage protection switch is connected between impedance matching network and ground end; can ensure can not to cause damage to the diode in rectifier bridge when the switch is closed on the one hand, the loop that the energy of receiving coil can be made to consist of switch protecting circuit on the other hand discharges.
Here, in order to ensure the fail safe of the first switch and second switch, first electric capacity, the capacitance of the second electric capacity and the 3rd electric capacity will select suitable ratio, make the resonance frequency of receiving unit in described non-contact electric energy transmission device course of normal operation consistent with system operating frequency on the one hand, make when the first switch and second switch conducting on the other hand, unlikely excessive or when the first switch and second switch disconnect by the electric current of the first switch and second switch, the both end voltage of the first switch and second switch is unlikely excessive, in order to avoid cause the damage of switch tube.It is to be noted, overvoltage control circuit in above-described embodiment is that the analog circuit consisted of comparator realizes, and those skilled in the art are known, under the guidance of inventive concept, overvoltage control circuit can also be realized by numerically controlled method, such as, receive sampled voltage signal V
rect1carry out digital translation, afterwards, the digital voltage signal after conversion is compared to obtain described switch controlling signal with the first reference voltage signal and the second reference voltage signal respectively.Substitutions and modifications in thought range of the present invention are all within protection scope of the present invention.
Finally, the invention also discloses a kind of transmitting non-contact electric energy method, be applied in non-contact electric energy transmission device, described non-contact electric energy transmission device comprises radiating portion and the receiving unit of isolation, described radiating portion includes the transmitting coil of emitted energy, described receiving unit includes the receiving coil of received energy, the impedance matching network be connected with described receiving coil successively and current rectifying and wave filtering circuit, comprises the following steps:
Receive the high-frequency alternating current that described receiving coil exports, to obtain d. c. voltage signal;
Detect the value of described d. c. voltage signal, when described d. c. voltage signal is greater than preset voltage value, the switch protecting circuit of the first switch and second switch composition is utilized to control the energy of described receiving coil, to make energy not flow to described current rectifying and wave filtering circuit, until described d. c. voltage signal is no more than preset voltage value;
Wherein, described impedance matching network comprises the first impedance circuit and the second impedance circuit, between the first end that described first impedance circuit and the second impedance circuit are connected in series in described receiving coil and current rectifying and wave filtering circuit;
First polar end of described first switch is connected to the points of common connection of described first impedance circuit and the second impedance circuit, second polar end is held with being connected to, first polar end of described second switch is connected to the second end of described receiving coil and the points of common connection of current rectifying and wave filtering circuit, and the second polar end is held with being connected to;
Further, described impedance matching network also comprises the 3rd impedance circuit, and described 3rd impedance circuit is connected in series between the second end of described receiving coil and current rectifying and wave filtering circuit;
Further, the first polar end of described second switch is connected to the second end of described receiving coil and the points of common connection of the 3rd impedance circuit.
Further, described first switch and second switch are by the action of switch controlling signal control switch, and the step that described switch controlling signal produces comprises:
To sample described d. c. voltage signal, to obtain sampled voltage signal;
Receive the reference voltage signal of described sampled voltage signal and the described preset voltage value of sign, and carry out stagnant chain rate comparatively, to export described switch controlling signal;
When described sampled voltage signal be greater than stagnant chain rate compared with upper voltage limit value time, described switch controlling signal is effective status to control described first switch and second switch conducting simultaneously; When described sampled voltage signal be less than described stagnant chain rate compared with lower voltage limit value time, described switch controlling signal is disarmed state to control described first switch and second switch turns off simultaneously.
Further, described current rectifying and wave filtering circuit comprises full bridge rectifier and filter capacitor, and described full bridge rectifier receives the high-frequency alternating current of described receiving coil, to be converted to semifocal chord positive wave voltage signal, described filter capacitor receives described semifocal chord positive wave voltage signal, to obtain d. c. voltage signal.
Further, the equivalent capacity of impedance matching network and the equivalent inductance resonance of described receiving coil described in described non-contact electric energy transmission device course of normal operation, and resonance frequency is consistent with system operating frequency.
Non-contact electric energy transmission device of the present invention and method of electric energy transfer, well solve the problem of electric voltage over press in full-bridge rectification situation, and control program is simple, effective.
Carried out detailed description to according to the non-contact electric energy transmission device of the preferred embodiments of the present invention and method of electric energy transfer 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 embodiments of the invention as described above, these embodiments do not have all details of detailed descriptionthe, do not limit the specific embodiment that this invention 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 invention and practical application better, thus makes art technical staff that the present invention and the amendment on basis of the present invention can be utilized well to use.The present invention is only subject to the restriction of claims and four corner and equivalent.
Claims (15)
1. a non-contact electric energy transmission device; comprise radiating portion and the receiving unit of isolation; described radiating portion includes the transmitting coil of emitted energy; the receiving coil that described receiving unit includes received energy, the impedance matching network, current rectifying and wave filtering circuit and the voltage conversion circuit that are connected with described receiving coil successively; it is characterized in that; described receiving unit also comprises switch protecting circuit and overvoltage control circuit
Described impedance matching network comprises the first impedance circuit and the second impedance circuit, between the first end that described first impedance circuit and the second impedance circuit are connected in series in described receiving coil and current rectifying and wave filtering circuit;
Described current rectifying and wave filtering circuit receives the high-frequency alternating current that described receiving coil exports, to obtain d. c. voltage signal;
Described switch protecting circuit comprises the first switch and second switch, first polar end of described first switch is connected to the points of common connection of described first impedance circuit and the second impedance circuit, second polar end is held with being connected to, first polar end of described second switch is connected to the second end of described receiving coil and the points of common connection of current rectifying and wave filtering circuit, and the second polar end is held with being connected to;
Described overvoltage control circuit receives described d. c. voltage signal and reference voltage signal, produces the on off state that switch controlling signal controls described first switch and second switch, is no more than preset voltage value to make described d. c. voltage signal.
2. non-contact electric energy transmission device according to claim 1, it is characterized in that, described current rectifying and wave filtering circuit comprises full bridge rectifier and filter capacitor, described full bridge rectifier receives the high-frequency alternating current of described receiving coil, to be converted to sinusoidal half-wave voltage signal, described filter capacitor receives described sinusoidal half-wave voltage signal, to obtain d. c. voltage signal.
3. non-contact electric energy transmission device according to claim 2, it is characterized in that, described full bridge rectifier comprise be connected in series the first diode, the second diode and the 3rd diode be connected in series, the 4th diode, two pairs of diodes be connected in series are connected in parallel again, and the public connecting end of described first diode and the 3rd diode exports described sinusoidal half-wave voltage signal; The public connecting end of described second diode and the 4th diode connects earth terminal;
Described second impedance circuit is connected to the points of common connection of described first diode and the second diode.
4. non-contact electric energy transmission device according to claim 3, is characterized in that, described impedance matching network also comprises the 3rd impedance circuit, and described 3rd impedance circuit is connected in series between the second end of described receiving coil and current rectifying and wave filtering circuit;
Further, the first polar end of described second switch is connected to the second end of described receiving coil and the points of common connection of the 3rd impedance circuit.
5. non-contact electric energy transmission device according to claim 4, is characterized in that, described 3rd impedance circuit is connected to the points of common connection of described 3rd diode and the 4th diode.
6. the non-contact electric energy transmission device according to claim 1 or 4, is characterized in that, described overvoltage control circuit specifically comprises sample circuit and hysteresis comparator,
D. c. voltage signal described in described sampling circuit samples, to obtain sampled voltage signal;
Described hysteresis comparator receives described sampled voltage signal and characterizes the reference voltage signal of described preset voltage value, exports described switch controlling signal,
When described sampled voltage signal is greater than the upper voltage limit value of described hysteresis comparator, described switch controlling signal is that effective status is to control described first switch and second switch conducting simultaneously; When described sampled voltage signal is less than the lower voltage limit value of described hysteresis comparator, described switch controlling signal is disarmed state to control described first switch and second switch turns off simultaneously.
7. non-contact electric energy transmission device according to claim 1, is characterized in that, described first impedance circuit and the second impedance circuit are respectively the first electric capacity and the second electric capacity,
Equivalent capacity after the first electric capacity described in described non-contact electric energy transmission device course of normal operation and the second capacitances in series and the equivalent inductance resonance of described receiving coil, and resonance frequency is consistent with system operating frequency.
8. non-contact electric energy transmission device according to claim 4, is characterized in that, described first impedance circuit, the second impedance circuit and the 3rd impedance circuit are respectively the first electric capacity, the second electric capacity and the 3rd electric capacity,
Equivalent capacity after the first electric capacity described in described non-contact electric energy transmission device course of normal operation, the second electric capacity and the 3rd capacitances in series and the equivalent inductance resonance of described receiving coil, and resonance frequency is consistent with system operating frequency.
9. non-contact electric energy transmission device according to claim 1, is characterized in that, described voltage conversion circuit receives the d. c. voltage signal of described current rectifying and wave filtering circuit transmission, by exporting suitable voltage swing supply electronic equipment after direct voltage conversion.
10. non-contact electric energy transmission device according to claim 1, is characterized in that, described first switch and second switch are field-effect transistor.
11. 1 kinds of transmitting non-contact electric energy methods, be applied in non-contact electric energy transmission device, described non-contact electric energy transmission device comprises radiating portion and the receiving unit of isolation, described radiating portion includes the transmitting coil of emitted energy, described receiving unit includes the receiving coil of received energy, the impedance matching network be connected with described receiving coil successively and current rectifying and wave filtering circuit, it is characterized in that, comprise the following steps:
Receive the high-frequency alternating current that described receiving coil exports, to obtain d. c. voltage signal;
Detect the value of described d. c. voltage signal, when described d. c. voltage signal is greater than preset voltage value, the switch protecting circuit of the first switch and second switch composition is utilized to control the energy of described receiving coil, to make energy not flow to described current rectifying and wave filtering circuit, until described d. c. voltage signal is no more than preset voltage value;
Wherein, described impedance matching network comprises the first impedance circuit and the second impedance circuit, between the first end that described first impedance circuit and the second impedance circuit are connected in series in described receiving coil and current rectifying and wave filtering circuit;
First polar end of described first switch is connected to the points of common connection of described first impedance circuit and the second impedance circuit, second polar end is held with being connected to, first polar end of described second switch is connected to the second end of described receiving coil and the points of common connection of current rectifying and wave filtering circuit, and the second polar end is held with being connected to.
12. transmitting non-contact electric energy methods according to claim 11, is characterized in that, described impedance matching network also comprises the 3rd impedance circuit, and described 3rd impedance circuit is connected in series between the second end of described receiving coil and current rectifying and wave filtering circuit;
Further, the first polar end of described second switch is connected to the second end of described receiving coil and the points of common connection of the 3rd impedance circuit.
13. transmitting non-contact electric energy methods according to claim 11 or 12, is characterized in that, described first switch and second switch are by the action of switch controlling signal control switch, and the step that described switch controlling signal produces comprises:
To sample described d. c. voltage signal, to obtain sampled voltage signal;
Receive the reference voltage signal of described sampled voltage signal and the described preset voltage value of sign, and carry out stagnant chain rate comparatively, to export described switch controlling signal;
When described sampled voltage signal be greater than stagnant chain rate compared with upper voltage limit value time, described switch controlling signal is effective status to control described first switch and second switch conducting simultaneously; When described sampled voltage signal be less than described stagnant chain rate compared with lower voltage limit value time, described switch controlling signal is disarmed state to control described first switch and second switch turns off simultaneously.
14. transmitting non-contact electric energy methods according to claim 11 or 12, it is characterized in that, described current rectifying and wave filtering circuit comprises full bridge rectifier and filter capacitor, described full bridge rectifier receives the high-frequency alternating current of described receiving coil, to be converted to sinusoidal half-wave voltage signal, described filter capacitor receives described sinusoidal half-wave voltage signal, to obtain d. c. voltage signal.
15. transmitting non-contact electric energy methods according to claim 11, it is characterized in that, the equivalent capacity of impedance matching network and the equivalent inductance resonance of described receiving coil described in described non-contact electric energy transmission device course of normal operation, and resonance frequency is consistent with system operating frequency.
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| CN201510393831.4A CN105098844B (en) | 2015-07-02 | 2015-07-02 | A kind of non-contact electric energy transmission device and method of electric energy transfer |
| US15/198,092 US10063103B2 (en) | 2015-07-02 | 2016-06-30 | Contactless power transmission device and power transmission method thereof |
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| CN201510393831.4A CN105098844B (en) | 2015-07-02 | 2015-07-02 | A kind of non-contact electric energy transmission device and method of electric energy transfer |
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