CN105098844B - A kind of non-contact electric energy transmission device and method of electric energy transfer - Google Patents
A kind of non-contact electric energy transmission device and method of electric energy transfer Download PDFInfo
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- CN105098844B CN105098844B CN201510393831.4A CN201510393831A CN105098844B CN 105098844 B CN105098844 B CN 105098844B CN 201510393831 A CN201510393831 A CN 201510393831A CN 105098844 B CN105098844 B CN 105098844B
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Abstract
The invention discloses a kind of non-contact electric energy transmission device and method of electric energy transfer; current rectifying and wave filtering circuit receives the high-frequency alternating current of the receiving coil output; d. c. voltage signal is obtained after full-bridge rectification, filtering process; when the DC voltage after detecting rectifying and wave-filtering exceedes predetermined value; a current loop is formed using switch protecting circuit, impedance matching circuit and receiving coil; to cause the energy of receiving coil to be transferred, until Current Voltage drops to no more than scheduled voltage.Wherein, switch protecting circuit is connected between impedance matching network and ground, and in power transfer normal work, the switch protecting circuit does not work, and when overpressure situation occurs, the switch protecting circuit carries out switch motion to reduce the value of DC voltage.
Description
Technical field
The present invention relates to wireless charging field, in particular, is related to a kind of non-contact electric energy transmission device and electric energy and passes
Transmission method.
Background technology
Transmitting non-contact electric energy technology (being also wireless power transmission technology) is widely used in due to the advantages that safe ready
In electronics charging field, realizing the mode of wireless power transmission mainly has magnetic inductive and magnetic resonance type two ways, generally often
For magnetic resonance type, magnetic resonance type wireless electric energy transmission device mainly includes emitting portion and receiving portion, and both pass through electricity
Magnetic resonance principle realizes that energy transmits.
In general, emitting portion includes inverter, impedance matching circuit and transmitting coil, and receiving portion, which includes, to be connect
Take-up circle, impedance matching circuit, rectification circuit (by taking full-bridge rectification as an example) and DC voltage converting circuit (DC-DC converter),
Non-contact electric energy transmission device as shown in Figure 1, emitting portion only shows transmitting coil, transmitting coil L in Fig. 1SReceive alternation
It is ω that electric current, which produces frequency,0Alternating magnetic field, receiving coil LdIt is ω to induce frequency0Alternating voltage Vsin(ω0), afterwards,
Alternating voltage Vsin is compensated to obtain DC voltage V by full bridge rectifier rectification and filter capacitor Crect。
In the process, as receiving coil LdWith transmitting coil LSCouple in the case of getting well, the alternation that receiving coil generates
Voltage magnitude is higher；In the case where coupling difference, the alternating voltage amplitude that receiving coil generates is relatively low.Therefore, in order to connect
Receiving end can induce the DC voltage V of maximum amplituderect, the inductance L resonant frequencies setting of compensating electric capacity C and reception end-coil
For in frequencies omega0On.
But in electric energy transmitting procedure, because the coupling of transmitting coil and receiving coil can change, such as couple
Magnetic field energy in enhancing suddenly or transmitting coil increases suddenly, this DC voltage V after causing full bridge rectifierrect
More than preset value, excessive voltage can damage the electronic equipment of the DC-DC converter of rear class, even load-side.
The content 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, whole when detecting
When flowing filtered DC voltage and exceeding preset voltage value, a portion of switch protecting circuit, impedance matching network is utilized
And receiving coil forms a loop so that the energy of receiving coil does not flow to the rectifier circuit of rear class, until direct current
Pressure is recovered extremely to be no more than preset voltage value.
According to a kind of non-contact electric energy transmission device of the present invention, include the emitting portion and receiving portion of isolation, it is described
Emitting portion includes the transmitting coil of emitted energy, the receiving portion include receive energy receiving coil, successively with
Impedance matching network, current rectifying and wave filtering circuit and the voltage conversion circuit of the receiving coil connection, the receiving portion also include
Switch protecting circuit and over-pressed control circuit,
The impedance matching network includes the first impedance circuit and the second impedance circuit, first impedance circuit and second
Impedance circuit is connected in series between first end and the current rectifying and wave filtering circuit of the receiving coil；
The current rectifying and wave filtering circuit receives the high-frequency alternating current of the receiving coil output, to obtain d. c. voltage signal；
The switch protecting circuit includes first switch and second switch, and the first polar end of the first switch is connected to
The points of common connection of first impedance circuit and the second impedance circuit, the second polar end are connected to ground terminal, the second switch
The first polar end be connected to the second end and the points of common connection of current rectifying and wave filtering circuit of the receiving coil, the second polar end connects
It is connected to ground terminal；
The over-pressed control circuit receives the d. c. voltage signal and reference voltage signal, produces switch controlling signal control
The on off state of the first switch and second switch is made, to cause the d. c. voltage signal to be no more than preset voltage value.
Preferably, the current rectifying and wave filtering circuit includes full bridge rectifier and filter capacitor, and the full bridge rectifier connects
The high-frequency alternating current of the receiving coil is received, to be converted to sinusoidal half-wave voltage signal, the filter capacitor receives the sine
Half-wave voltage signal, to obtain d. c. voltage signal.
Further, the first diode, the second diode and series connection that the full bridge rectifier includes being connected in series connect
The 3rd diode, the 4th diode connect, two pairs of diodes being connected in series are connected in parallel again, first diode and the 3rd
The public connecting end of diode exports the sinusoidal half-wave voltage signal；The public company of second diode and the 4th diode
Connect end connection ground terminal；
Second impedance circuit is connected to the points of common connection of first diode and the second diode.
Further, the impedance matching network also includes the 3rd impedance circuit, and the 3rd impedance circuit is connected in series
Between the second end of the receiving coil and current rectifying and wave filtering circuit；
Also, the first polar end of the second switch is connected to the second end and the 3rd impedance circuit of the receiving coil
Points of common connection.
Preferably, the 3rd impedance circuit is connected to the points of common connection of the 3rd diode and the 4th diode.
Further, the over-pressed control circuit specifically includes sample circuit and hysteresis comparator,
D. c. voltage signal described in the sampling circuit samples, to obtain sampled voltage signal；
The hysteresis comparator receives the sampled voltage signal and characterizes the reference voltage signal of the preset voltage value,
The switch controlling signal is exported,
When the sampled voltage signal is more than the upper voltage limit value of the hysteresis comparator, the switch controlling signal is
Effective status is to control the first switch and second switch to simultaneously turn on；When the sampled voltage signal is less than the stagnant ring ratio
Compared with device lower voltage limit value when, the switch controlling signal is disarmed state to control the first switch and second switch simultaneously
Shut-off.
Preferably, first impedance circuit and the second impedance circuit are respectively the first electric capacity and the second electric capacity,
After the first electric capacity described in the non-contact electric energy transmission device course of normal operation and the series connection of the second electric capacity
Equivalent capacity and the equivalent inductance resonance of the receiving coil, and resonant frequency is consistent with system operating frequency.
Preferably, first impedance circuit, the second impedance circuit and the 3rd impedance circuit are respectively the first electric capacity, second
Electric capacity and the 3rd electric capacity,
The first electric capacity, the second electric capacity and the 3rd electric capacity described in the non-contact electric energy transmission device course of normal operation
Equivalent capacity and the equivalent inductance resonance of the receiving coil after series connection, and resonant frequency is consistent with system operating frequency.
Further, the voltage conversion circuit receives the d. c. voltage signal of the current rectifying and wave filtering circuit transmission, passes through
Suitable voltage swing supply electronic equipment is exported after DC voltage conversion.
Preferably, the first switch and second switch are field-effect transistor.
It is described non-applied in non-contact electric energy transmission device according to a kind of transmitting non-contact electric energy method of the present invention
Contacting power transfer includes the emitting portion and receiving portion of isolation, and the emitting portion includes the transmitting of emitted energy
Coil, the receiving portion include receiving coil, the impedance matching net being connected successively with the receiving coil for receiving energy
Network and current rectifying and wave filtering circuit, comprise the following steps：
The high-frequency alternating current of the receiving coil output is received, to obtain d. c. voltage signal；
The value of the d. c. voltage signal is detected, when the d. c. voltage signal is more than preset voltage value, utilizes first
The switch protecting circuit of switch and second switch composition controls the energy of the receiving coil, so that energy does not flow to the rectification
Filter circuit, until the d. c. voltage signal is no more than preset voltage value；
Wherein, the impedance matching network includes the first impedance circuit and the second impedance circuit, first impedance circuit
And second impedance circuit be connected in series between first end and the current rectifying and wave filtering circuit of the receiving coil；
First polar end of the first switch is connected to the public company of first impedance circuit and the second impedance circuit
Contact, the second polar end are connected to ground terminal, and the first polar end of the second switch is connected to the second end of the receiving coil
With the points of common connection of current rectifying and wave filtering circuit, the second polar end is connected to ground terminal；
Preferably, the impedance matching network also includes the 3rd impedance circuit, and the 3rd impedance circuit is connected in series in
Between second end of the receiving coil and current rectifying and wave filtering circuit；
Also, the first polar end of the second switch is connected to the second end and the 3rd impedance circuit of the receiving coil
Points of common connection.
Further, the first switch and second switch are acted by switch controlling signal controlling switch, the switch control
The step of signal processed produces includes：
The d. c. voltage signal is sampled, to obtain sampled voltage signal；
Receive the sampled voltage signal and characterize the reference voltage signal of the preset voltage value, and carry out stagnant ring ratio
Compared with to export the switch controlling signal；
When the sampled voltage signal is more than the upper voltage limit value that stagnant ring compares, the switch controlling signal is effective shape
State is to control the first switch and second switch to simultaneously turn on；Under the sampled voltage signal compares less than the stagnant ring
During voltage limit value, the switch controlling signal is disarmed state to control the first switch and second switch to simultaneously turn off.
Preferably, the current rectifying and wave filtering circuit includes full bridge rectifier and filter capacitor, and the full bridge rectifier connects
The high-frequency alternating current of the receiving coil is received, to be converted to semifocal chord positive wave voltage signal, the filter capacitor receives the semifocal chord
Positive wave voltage signal, to obtain d. c. voltage signal.
Preferably, the equivalent electric of the impedance matching network described in the non-contact electric energy transmission device course of normal operation
Hold the equivalent inductance resonance with the receiving coil, and resonant frequency is consistent with system operating frequency.
By above-mentioned non-contact electric energy transmission device and transmission method, it is defeated that current rectifying and wave filtering circuit receives the receiving coil
The high-frequency alternating current gone out, obtains d. c. voltage signal after full-bridge rectification, filtering process, and the d. c. voltage signal is straight through rear class
Electronic equipment is supplied after stream voltage conversion.When the DC voltage after detecting rectifying and wave-filtering exceedes preset voltage value, using opening
Close protection circuit, the first impedance circuit and receiving coil and form a current loop, to cause the energy of receiving coil not flow to
Rectifier bridge, until Current Voltage recovers to no more than predetermined value.Wherein, switch protecting circuit is connected to impedance matching network and ground
Between, in power transfer normal work, the switch protecting circuit does not work, described to open when overpressure situation occurs
Close protection circuit and carry out switch motion to reduce the value of DC voltage.Technical scheme solves full-bridge rectification well
In the case of electric voltage over press the problem of, control program is simple, and effect is good.
Brief description of the drawings
The basic circuit diagram of non-contact electric energy transmission device shown in Fig. 1；
Fig. 2 show the circuit block diagram of the first embodiment of the non-contact electric energy transmission device according to the present invention；
Fig. 3 show the circuit block diagram of the second embodiment of the non-contact electric energy transmission device according to the present invention；
Fig. 4 show the embodiment circuit diagram of embodiment illustrated in fig. 3；
Fig. 5 show the working waveform figure of circuit shown in Fig. 4.
Embodiment
Several preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing, but the present invention is not restricted to
These embodiments.The present invention covers any replacement, modification, equivalent method and side made in the spirit and scope of the present invention
Case.Thoroughly understand in order that the public has to the present invention, be described in detail in present invention below preferred embodiment specific thin
Section, and description without these details can also understand the present invention completely for a person skilled in the art.
The circuit block diagram of the first embodiment of the non-contact electric energy transmission device according to the present invention is shown with reference to figure 2, such as
Shown in Fig. 2, the non-contact electric energy transmission device includes the emitting portion and receiving portion of isolation, and the emitting portion includes
The transmitting coil L of inverter (not shown), impedance matching network (not shown) and emitted energyS, the receiving portion includes
Receive the receiving coil L of energyd, the impedance matching network, current rectifying and wave filtering circuit and the direct current that are connected with the receiving coil successively
Change-over circuit 201, the current rectifying and wave filtering circuit receive the high-frequency alternating current of the receiving coil output, to obtain DC voltage letter
Number Vrect, DC converting circuit 201 receives the d. c. voltage signal Vrect, suitable voltage swing is exported after voltage conversion
Supply electronic equipment.
Specifically, in the present embodiment, the current rectifying and wave filtering circuit includes full bridge rectifier and filter capacitor C, institute
The high-frequency alternating current that full bridge rectifier receives the receiving coil is stated, to be converted to sinusoidal half-wave voltage signal, the filtering
Electric capacity receives the sinusoidal half-wave voltage signal, to obtain d. c. voltage signal, specifically, as shown in Figure 2, the full-bridge is whole
Current circuit includes the first diode D1, the second diode D2 and the 3rd diode D3 being connected in series, the four or two being connected in series
Pole pipe D4, two pairs of diodes being connected in series are connected in parallel again；The public company of the first diode D1 and the 3rd diode D3
Connect end and export the sinusoidal half-wave voltage signal；The public connecting end connection ground of the second diode D2 and the 4th diode D4
End.
Further, as shown in Fig. 2 impedance matching network includes the first impedance circuit and the second impedance circuit, described
One impedance circuit Z1 and the second impedance circuit Z2 are connected in series between first end and the current rectifying and wave filtering circuit of the receiving coil.
Here, it is first end to remember the receiving coil upper end, and lower end is the second end, but not limited to this or first end are lower end,
Second end is upper end.Heretofore described first end or the second end are not as the restriction to receiving coil output end.Here, institute
State the equivalent capacity of the first impedance circuit and the second impedance circuit and the equivalent inductance resonance of the receiving coil, and resonant frequency
It is consistent with system operating frequency.
Further, the switch protecting circuit includes first switch S1 and second switch S2, it is shown in fig. 2, described
First switch S1 the first polar end is connected to the first impedance circuit Z1 and the second impedance circuit Z2 points of common connection, the second pole
Property end ground connection；The first polar end of the second switch S2 is connected to the second end and the current rectifying and wave filtering circuit of the receiving coil
Points of common connection, the second polar end ground connection.In Fig. 2, the first switch S1 and second switch S2 by taking field-effect transistor as an example,
Because the second polar end of first switch and second switch (being source electrode) is grounded, set with the voltage conversion circuit and electronics of rear class
Standby is that altogether, source voltage is stable, is easy to drive.It is readily appreciated that, the first switch S1 and second switch S2 are not limited to above-mentioned
Field-effect transistor, can also be suitable switching tube, such as single-pole double-throw switch (SPDT) in the prior art.
With continued reference to Fig. 2, first switch S1 and second switch S2 control its switch motion, mistake by over-pressed control circuit 202
Pressure control circuit 202 receives the d. c. voltage signal Vrect1With reference voltage signal Vref1, produce switch controlling signal VconControl
First switch S1 and second switch S2 processed on off state, to cause the d. c. voltage signal to be no more than preset voltage value.
It is can be seen that from the circuit in Fig. 2 in above-mentioned non-contact electric energy transmission device course of normal operation, first switch
Be held off with second switch, the equivalent capacity of impedance matching network and the inductance of receiving coil with system operating frequency resonance,
So as to carry out wireless energy transfer with maximal efficiency；And when the non-contact electric energy transmission device occurs abnormal, DC voltage
Signal raises, and the present invention controls the switch motion of first switch and second switch by over-pressed control circuit so that receives line
The energy of circle is fallen by the loop transfer by receiving coil, the first impedance circuit and switch protecting circuit so that under DC voltage
Drop, recovers to preset voltage value.
The circuit block diagram of the first embodiment of the non-contact electric energy transmission device according to the present invention is shown with reference to figure 3, this
Current rectifying and wave filtering circuit, voltage conversion circuit, switch protecting circuit and over-pressed control circuit in embodiment with it is real shown in Fig. 2
It is identical to apply example, except that, in the present embodiment, the impedance matching network still further comprises the 3rd impedance circuit Z3,
The 3rd impedance electricity Z3 roads are connected in series between the second end of the receiving coil and current rectifying and wave filtering circuit；It is also, described
First polar end of second switch is connected to the second end of the receiving coil and the points of common connection of the 3rd impedance circuit.
Compared with the embodiment shown in Fig. 2, three impedance matching circuits of use of the present embodiment may be such that first switch S1
Resistance to pressure is relatively reduced, reduces switch cost.
The embodiment circuit diagram of embodiment shown in Fig. 3 is shown with reference to figure 4, present embodiment specifically have received
The specific implementation of impedance matching circuit and over-pressed control circuit, as shown in figure 4, 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 switch S1 the first pole
Property end is connected to the first electric capacity C1 and the second electric capacity C2 points of common connection, and the first polar end of the second switch S2 is connected to
Second end of the receiving coil and the points of common connection of the 3rd electric capacity C3.Accordingly, the first electric capacity C1, the second electricity
The capacitance for holding C2 and the 3rd electric capacity C3 is arranged to suitably be worth, to cause the efficiency highest at work, being wirelessly transferred, such as
For：The first electric capacity described in the non-contact electric energy transmission device course of normal operation, the second electric capacity and the series connection of the 3rd electric capacity
Equivalent capacity afterwards and the equivalent inductance resonance of the receiving coil, and resonant frequency is consistent with system operating frequency.
In the present embodiment, the first impedance being connected in series between the first end and current rectifying and wave filtering circuit of the receiving coil is electric
Road and the second impedance circuit, are connected in series the 3rd impedance circuit between the second end of the receiving coil and current rectifying and wave filtering circuit,
It is readily appreciated that, the embodiment of impedance circuit also has other a variety of various combinations, for example, the first end of the receiving coil and
Connected between two ends and current rectifying and wave filtering circuit two or more impedance circuits, as long as finally meeting impedance matching network
Equivalent capacity and the receiving coil equivalent inductance resonance, and resonant frequency is consistent with system operating frequency.
Here, when the electric capacity quantity of the first impedance circuit and the second impedance circuit changes, first switch and second
The polar end link position of switch also respective change, for example, when the first end and the second end and rectifying and wave-filtering of the receiving coil
Connected between circuit two electric capacity when, then the first switch and the second switch are connected to the public affairs of respective two electric capacity
Tie point altogether.Skilled person will appreciate that under the guidance of the technology of the present invention, impedance matching network and switch protecting circuit have
Multiple combinations mode and corresponding connected mode, all improvement and replacement in the thought range of the present invention, the guarantor in the present invention
Within the scope of shield.
The impedance circuit of the present embodiment by taking electric capacity as an example, skilled person will appreciate that, impedance circuit can also be inductance,
The components such as electric capacity, resistance are independent or are mutually combined composition, as long as meeting above-mentioned resonance requirement.
With reference to figure 4, the over-pressed control circuit 202 in present embodiment specifically includes sample circuit and hysteresis comparator, adopts
Sample circuit is made up of divider resistance R1 and resistance R2, and hysteresis comparator is made up of resistance R3, resistance R4 and comparator CMP, partial pressure
Resistance R1 and resistance R2 samples the d. c. voltage signal Vrect, to obtain sampled voltage signal Vrect1；The hysteresis comparator
Positive input receive the sampled voltage signal Vrect1, the reference electricity of the reverse input end reception sign preset voltage value
Press signal Vref1, export the switch controlling signal Vcon, the switch controlling signal control first switch S1 and second switch
S2 is simultaneously turned on or turned off.
The course of work of overvoltage protection of the present invention is illustrated below with reference to the oscillogram shown in Fig. 5：At the t1 moment, external condition
Change, cause d. c. voltage signal to occur abnormal, constantly rise, at the t2 moment, when detecting the sampled voltage signal
Vrect1More than the hysteresis comparator upper voltage limit value when, characterize d. c. voltage signal exceed preset value, at this moment, the comparison
The switch controlling signal of device CMP outputs (such as is shown as effective status, low level is shown as invalid shape for effective status with high level
State), first switch S1 and second switch S2 are simultaneously turned on, receiving coil Ld, the first electric capacity C1, first switch S1 and second switch
S2 forms a current loop, at this moment, because resonance can not occur for the first electric capacity C1 and receiving coil equivalent inductance, receives line
The energy of the transmission of circle can greatly reduce, and the electric current in current loop will not be very big, and the energy of receiving coil output will not pass
Transport to current rectifying and wave filtering circuit, d. c. voltage signal VrectBegin to decline, when dropping to t3 moment, the sampled voltage signal Vrect1
Less than the hysteresis comparator lower voltage limit value when, the switch controlling signal is changed into disarmed state and controls the first switch
S1 and second switch S2 are simultaneously turned off.The energy of receiving coil is re-transmitted to current rectifying and wave filtering circuit, if abnormal conditions are also deposited
In then d. c. voltage signal VrectContinue to rise, until when reaching the upper voltage limit value of hysteresis comparator, first switch S1 and the
Two switch S2 are switched on, and make d. c. voltage signal VrectDecline, so repeatedly, until arriving the t4 moment, circuit abnormality situation releases,
D. c. voltage signal VrectDrop to and be no more than preset voltage value.
From said process as can be seen that when the non-contact electric energy transmission device occurs abnormal, output voltage can be caused
Rise, causes the infringement to voltage conversion circuit or electronic equipment, and therefore, the present invention is led to prevent the infringement to late-class circuit
The output voltage signal for crossing detection current rectifying and wave filtering circuit carries out overvoltage protection control to carrying out output voltage.The present invention's has overvoltage
The wireless electric energy transmission device of defencive function, more preferable more stable d. c. voltage signal can be obtained by full bridge rectifier,
And overvoltage protection switch is connected between impedance matching network and ground terminal, on the one hand can ensure when the switch is closed will not be right
Diode in rectifier bridge causes damage, and on the other hand can make it that the energy of receiving coil is made up of switch protecting circuit
Loop discharges.
Here, in order to ensure the security of first switch and second switch, the first electric capacity, the second electric capacity and the 3rd electric capacity
Capacitance will select suitable ratio, on the one hand cause the receiving portion in the non-contact electric energy transmission device course of normal operation
Resonant frequency it is consistent with system operating frequency, on the other hand, when first switch and second switch turn on, to pass through first
The electric current of switch and second switch will not be excessive or when first switch and second switch disconnects, first switch and second switch
Both end voltage will not be excessive, in order to avoid cause the damage of switch tube.It is pointed out that the overvoltage control in above-described embodiment
Circuit is that the analog circuit being made up of comparator is realized, skilled person will appreciate that, under the guidance of inventive concept, mistake
Pressure control circuit can also be realized by numerically controlled method, such as receive sampled voltage signal Vrect1Digital conversion is carried out,
Afterwards, by the digital voltage signal after conversion respectively compared with the first reference voltage signal and the second reference voltage signal with
Obtain the switch controlling signal.The present invention thought range in substitutions and modifications all protection scope of the present invention it
It is interior.
Finally, the invention also discloses a kind of transmitting non-contact electric energy method, applied in non-contact electric energy transmission device,
The non-contact electric energy transmission device includes the emitting portion and receiving portion of isolation, and the emitting portion includes emitted energy
Transmitting coil, the receiving portion includes the receiving coil for receiving energy, the impedance that is connected successively with the receiving coil
Matching network and current rectifying and wave filtering circuit, comprise the following steps：
The high-frequency alternating current of the receiving coil output is received, to obtain d. c. voltage signal；
The value of the d. c. voltage signal is detected, when the d. c. voltage signal is more than preset voltage value, utilizes first
The switch protecting circuit of switch and second switch composition controls the energy of the receiving coil, so that energy does not flow to the rectification
Filter circuit, until the d. c. voltage signal is no more than preset voltage value；
Wherein, the impedance matching network includes the first impedance circuit and the second impedance circuit, first impedance circuit
And second impedance circuit be connected in series between first end and the current rectifying and wave filtering circuit of the receiving coil；
First polar end of the first switch is connected to the public company of first impedance circuit and the second impedance circuit
Contact, the second polar end are connected to ground terminal, and the first polar end of the second switch is connected to the second end of the receiving coil
With the points of common connection of current rectifying and wave filtering circuit, the second polar end is connected to ground terminal；
Further, the impedance matching network also includes the 3rd impedance circuit, and the 3rd impedance circuit is connected in series
Between the second end of the receiving coil and current rectifying and wave filtering circuit；
Also, the first polar end of the second switch is connected to the second end and the 3rd impedance circuit of the receiving coil
Points of common connection.
Further, the first switch and second switch are acted by switch controlling signal controlling switch, the switch control
The step of signal processed produces includes：
The d. c. voltage signal is sampled, to obtain sampled voltage signal；
Receive the sampled voltage signal and characterize the reference voltage signal of the preset voltage value, and carry out stagnant ring ratio
Compared with to export the switch controlling signal；
When the sampled voltage signal is more than the upper voltage limit value that stagnant ring compares, the switch controlling signal is effective shape
State is to control the first switch and second switch to simultaneously turn on；Under the sampled voltage signal compares less than the stagnant ring
During voltage limit value, the switch controlling signal is disarmed state to control the first switch and second switch to simultaneously turn off.
Further, the current rectifying and wave filtering circuit includes full bridge rectifier and filter capacitor, the full bridge rectifier
The high-frequency alternating current of the receiving coil is received, to be converted to semifocal chord positive wave voltage signal, the filter capacitor receives described half
String positive wave voltage signal, to obtain d. c. voltage signal.
Further, the impedance matching network described in the non-contact electric energy transmission device course of normal operation is equivalent
The equivalent inductance resonance of electric capacity and the receiving coil, and resonant frequency is consistent with system operating frequency.
The non-contact electric energy transmission device and method of electric energy transfer of the present invention, solves electricity in the case of full-bridge rectification well
The problem of pressing through pressure, control program is simple, and effect is good.
The non-contact electric energy transmission device according to the preferred embodiments of the present invention and method of electric energy transfer are carried out above
Detailed description, those of ordinary skill in the art can deduce that other technologies or structure and circuit layout, element etc. are equal accordingly
It can be applied to the embodiment.
According to embodiments of the invention as described above, these embodiments do not have all details of detailed descriptionthe, not yet
It is only described specific embodiment to limit the invention.Obviously, as described above, can make many modifications and variations.This explanation
Book is chosen and specifically describes these embodiments, is in order to preferably explain the principle and practical application of the present invention, so that affiliated
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.The present invention is only by right
The limitation of claim and its four corner and equivalent.
Claims (15)
1. a kind of non-contact electric energy transmission device, includes the emitting portion and receiving portion of isolation, the emitting portion includes
The transmitting coil of emitted energy, the receiving portion, which includes, to be received the receiving coil of energy, connects successively with the receiving coil
Impedance matching network, current rectifying and wave filtering circuit and the voltage conversion circuit connect, it is characterised in that the receiving portion also includes switch
Protection circuit and over-pressed control circuit,
The impedance matching network includes the first impedance circuit and the second impedance circuit, first impedance circuit and the second impedance
Circuit connected in series is connected between first end and the current rectifying and wave filtering circuit of the receiving coil；In the non-contact electric energy transmission device
In course of normal operation, the equivalent capacity of first impedance circuit and the second impedance circuit and the equivalent electric of the receiving coil
Feel resonance, and resonant frequency is consistent with system operating frequency；
The current rectifying and wave filtering circuit receives the high-frequency alternating current of the receiving coil output, to obtain d. c. voltage signal；
The switch protecting circuit includes first switch and second switch, and the first polar end of the first switch is connected to described
The points of common connection of first impedance circuit and the second impedance circuit, the second polar end are connected to ground terminal, and the of the second switch
One polar end is connected to the second end and the points of common connection of current rectifying and wave filtering circuit of the receiving coil, and the second polar end is connected to
Ground terminal；
The over-pressed control circuit receives the d. c. voltage signal and reference voltage signal, produces switch controlling signal control institute
The on off state of first switch and second switch is stated, to cause the d. c. voltage signal to be no more than preset voltage value.
2. non-contact electric energy transmission device according to claim 1, it is characterised in that the current rectifying and wave filtering circuit includes complete
Bridge rectification circuit and filter capacitor, the full bridge rectifier receives the high-frequency alternating current of the receiving coil, to be converted to just
String half-wave voltage signal, the filter capacitor receives the sinusoidal half-wave voltage signal, to obtain d. c. voltage signal.
3. non-contact electric energy transmission device according to claim 2, it is characterised in that the full bridge rectifier includes string
Join the first diode, the second diode and the 3rd diode, the 4th diode being connected in series of connection, two pairs are connected in series
Diode is connected in parallel again, and the public connecting end of first diode and the 3rd diode exports the sinusoidal half-wave voltage letter
Number；The public connecting end connection ground terminal of second diode and the 4th diode；
Second impedance circuit is connected to the points of common connection of first diode and the second diode.
4. non-contact electric energy transmission device according to claim 3, it is characterised in that the impedance matching network also includes
3rd impedance circuit, the 3rd impedance circuit be connected in series in the receiving coil the second end and current rectifying and wave filtering circuit it
Between；
Also, the first polar end of the second switch is connected to the second end of the receiving coil and the public affairs of the 3rd impedance circuit
Tie point altogether；
In the non-contact electric energy transmission device course of normal operation, first impedance circuit, the second impedance circuit and
The equivalent inductance resonance of the equivalent capacity of three impedance circuits and the receiving coil, and resonant frequency and system operating frequency one
Cause.
5. non-contact electric energy transmission device according to claim 4, it is characterised in that the 3rd impedance circuit is connected to
The points of common connection of 3rd diode and the 4th diode.
6. the non-contact electric energy transmission device according to claim 1 or 4, it is characterised in that the over-pressed control circuit tool
Body includes sample circuit and hysteresis comparator,
D. c. voltage signal described in the sampling circuit samples, to obtain sampled voltage signal；
The hysteresis comparator receives the sampled voltage signal and characterizes the reference voltage signal of the preset voltage value, output
The switch controlling signal,
When the sampled voltage signal is more than the upper voltage limit value of the hysteresis comparator, the switch controlling signal is effective
State is to control the first switch and second switch to simultaneously turn on；When the sampled voltage signal is less than the hysteresis comparator
Lower voltage limit value when, the switch controlling signal is disarmed state to control the first switch and second switch while close
It is disconnected.
7. non-contact electric energy transmission device according to claim 1, it is characterised in that first impedance circuit and second
Impedance circuit is respectively the first electric capacity and the second electric capacity,
It is equivalent after the first electric capacity described in the non-contact electric energy transmission device course of normal operation and the series connection of the second electric capacity
The equivalent inductance resonance of electric capacity and the receiving coil, and resonant frequency is consistent with system operating frequency.
8. non-contact electric energy transmission device according to claim 4, it is characterised in that first impedance circuit, second
Impedance circuit and the 3rd impedance circuit are respectively the first electric capacity, the second electric capacity and the 3rd electric capacity,
The first electric capacity described in the non-contact electric energy transmission device course of normal operation, the second electric capacity and the series connection of the 3rd electric capacity
Equivalent capacity afterwards and the equivalent inductance resonance of the receiving coil, and resonant frequency is consistent with system operating frequency.
9. non-contact electric energy transmission device according to claim 1, it is characterised in that the voltage conversion circuit receives institute
The d. c. voltage signal of current rectifying and wave filtering circuit transmission is stated, suitable voltage swing supply electricity is exported after being changed by DC voltage
Sub- equipment.
10. non-contact electric energy transmission device according to claim 1, it is characterised in that the first switch and second is opened
Pass is field-effect transistor.
11. a kind of transmitting non-contact electric energy method, applied in non-contact electric energy transmission device, the transmitting non-contact electric energy fills
Emitting portion and receiving portion including isolation are put, the emitting portion includes the transmitting coil of emitted energy, the reception
Part includes the receiving coil for receiving energy, the impedance matching network being connected successively with the receiving coil and rectifying and wave-filtering electricity
Road, it is characterised in that comprise the following steps：
The high-frequency alternating current of the receiving coil output is received, to obtain d. c. voltage signal；
The value of the d. c. voltage signal is detected, when the d. c. voltage signal is more than preset voltage value, utilizes first switch
The energy of the receiving coil is controlled with the switch protecting circuit of second switch composition, so that energy does not flow to the rectifying and wave-filtering
Circuit, until the d. c. voltage signal is no more than preset voltage value；
Wherein, the impedance matching network includes the first impedance circuit and the second impedance circuit, first impedance circuit and
Two impedance circuits are connected in series between first end and the current rectifying and wave filtering circuit of the receiving coil；Passed in the non-contact electric energy
In defeated device course of normal operation, the equivalent capacity of first impedance circuit and the second impedance circuit and the receiving coil
Equivalent inductance resonance, and resonant frequency is consistent with system operating frequency；
First polar end of the first switch is connected to the points of common connection of first impedance circuit and the second impedance circuit,
Second polar end is connected to ground terminal, and the first polar end of the second switch is connected to the second end and the rectification of the receiving coil
The points of common connection of filter circuit, the second polar end are connected to ground terminal.
12. transmitting non-contact electric energy method according to claim 11, it is characterised in that the impedance matching network also wraps
Include the 3rd impedance circuit, the 3rd impedance circuit be connected in series in the receiving coil the second end and current rectifying and wave filtering circuit it
Between；In the non-contact electric energy transmission device course of normal operation, first impedance circuit, the second impedance circuit and the 3rd
The equivalent inductance resonance of the equivalent capacity of impedance circuit and the receiving coil, and resonant frequency is consistent with system operating frequency；
Also, the first polar end of the second switch is connected to the second end of the receiving coil and the public affairs of the 3rd impedance circuit
Tie point altogether.
13. the transmitting non-contact electric energy method according to claim 11 or 12, it is characterised in that the first switch and
The step of two switches are acted by switch controlling signal controlling switch, and the switch controlling signal produces includes：
The d. c. voltage signal is sampled, to obtain sampled voltage signal；
Receive the sampled voltage signal and characterize the reference voltage signal of the preset voltage value, and carry out stagnant ring and compare, with
Export the switch controlling signal；
When the sampled voltage signal be more than stagnant ring compare upper voltage limit value when, the switch controlling signal be effective status with
The first switch and second switch is controlled to simultaneously turn on；Rationed the power supply under the sampled voltage signal compares less than the stagnant ring
During pressure value, the switch controlling signal is disarmed state to control the first switch and second switch to simultaneously turn off.
14. the transmitting non-contact electric energy method according to claim 11 or 12, it is characterised in that the current rectifying and wave filtering circuit
Including full bridge rectifier and filter capacitor, the full bridge rectifier receives the high-frequency alternating current of the receiving coil, to turn
Semifocal chord positive wave voltage signal is changed to, the filter capacitor receives the semifocal chord positive wave voltage signal, to obtain d. c. voltage signal.
15. transmitting non-contact electric energy method according to claim 11, it is characterised in that in the transmitting non-contact electric energy
The equivalent capacity of impedance matching network described in device course of normal operation and the equivalent inductance resonance of the receiving coil, and it is humorous
Vibration frequency is consistent with system operating frequency.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
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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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| CN106887904A (en) * | 2015-12-15 | 2017-06-23 | 宁波微鹅电子科技有限公司 | A kind of wireless electric energy transmission device with overvoltage protection |
| CN106911194B (en) * | 2015-12-23 | 2019-11-08 | 宁波微鹅电子科技有限公司 | Electric energy receiving end and wireless electric energy transmission device with overvoltage protection |
| CN107565705B (en) | 2016-07-01 | 2020-06-12 | 宁波微鹅电子科技有限公司 | Control method of electric energy transmitting terminal, electric energy transmitting terminal and non-contact electric energy transmission device |
| CN106253494B (en) * | 2016-08-04 | 2019-06-21 | 中惠创智无线供电技术有限公司 | A kind of clipping control circuit, device and method |
| CN107733102B (en) * | 2016-08-22 | 2019-12-06 | 许继电源有限公司 | Receiving end circuit for wireless charging and vehicle using same |
| CN107800196A (en) * | 2016-08-30 | 2018-03-13 | 航天科工惯性技术有限公司 | A kind of synchronous transmission device that radio energy and signal are realized based on mapping impedance variations |
| CN111211591B (en) * | 2018-11-22 | 2021-07-27 | 美芯晟科技（北京）有限公司 | Overvoltage protection method, overvoltage protection circuit and wireless charging system |
| JP6782337B2 (en) * | 2019-07-10 | 2020-11-11 | 株式会社東芝 | Power receiving device, wireless power transmission system and power receiving method |
| CN115425769B (en) * | 2022-09-05 | 2024-06-07 | 广东电网有限责任公司 | Resonance energy-taking method, system and device for insulating overhead ground wire |
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