CN105391192B - A kind of electric energy transmitting terminal and wireless charging device - Google Patents
A kind of electric energy transmitting terminal and wireless charging device Download PDFInfo
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- CN105391192B CN105391192B CN201510828110.1A CN201510828110A CN105391192B CN 105391192 B CN105391192 B CN 105391192B CN 201510828110 A CN201510828110 A CN 201510828110A CN 105391192 B CN105391192 B CN 105391192B
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Abstract
The invention discloses a kind of electric energy transmitting terminal and wireless charging devices; when the both end voltage of primary side resonant network is increased to preset voltage value; then the portion of energy of transmitting coil is fed back in input power by energy back circuit; so that the both end voltage of resonant network is no more than preset voltage value; the increase to the output power of inverter circuit will not be caused, the switching device in inverter circuit can be protected not to be damaged.Technical scheme of the present invention can allow the energy being higher by be back in input power, and capacity usage ratio is high, can not only protect circuit not to be damaged but also can improve energy utilization efficiency.
Description
Technical field
The present invention relates to wireless charging fields, more specifically, being related to a kind of electric energy transmitting terminal and wireless charging device.
Background technology
It is as shown in Figure 1 a kind of circuit diagram of wireless charging device in the prior art, wireless charging device includes electricity
Energy transmitting terminal and electric energy receiving terminal, electric energy transmitting terminal, which includes inverter circuit, emission current adjusts circuit (has inductance Lc in such as Fig. 1
With capacitance Cc constitute), primary side resonant network (including primary side transmitting coil Ls and primary side resonant capacitance Cs), electric energy receiving terminal includes
It is secondary while resonant network (including secondary edge emitting coil Ld and it is secondary while resonant capacitance Cd), the wireless charging device further includes to nothing
Line transmits the transformer T of energy.
Under normal conditions, in order to make energy stabilization transmit, emission current adjusts circuit control and adjusts in primary side transmitting coil
By electric current Ix so that its be steady state value, be such as：IX=VACS/ωLC。VACSFor inverter output voltage, ω works for system
Frequency.As primary side transmitting coil Ls and primary side resonant capacitance Cs resonance in working frequency point (), primary side
The equiva lent impedance Zs of resonant network is 0, at this time efficiency of transmission highest, but since the inductance value of primary side transmitting coil is easy by extraneous ring
Border change, such as pair side receiving coil close to primary side transmitting coil or surrounding metal foreign matter to primary side transmitting coil surrounding magnetic field
Interference, all can make primary coil inductance value change, such primary side resonant capacitance Cs and primary side transmitting coil Ls be not in system work
The equiva lent impedance Zs of resonance on working frequency point, primary side resonant network shows high impedance.Another situation is due to secondary impedance
When being reflected into primary side, reflection equiva lent impedance and secondary impedance are in inversely prroportional relationship, as shown in Fig. 2, ZfIt is converted for secondary side
To the reflection equiva lent impedance of primary side, there is Zf=(ω M)2/Zd, ZdFor secondary impedance, ω is system operating frequency.When secondary side occurs
When overcurrent, secondary impedance ZdLow-resistance is presented, at this time primary side reflection equivalent circuit ZfIt then will present high resistant.
And according to circuit in Fig. 1 it is found that the voltage Vs at primary side resonant network both ends is：VS=IX×(ZS+Zf), work as appearance
When above two abnormal conditions, i.e., the reflection etc. to primary side is converted on the either equiva lent impedance Zs of primary side resonant network or secondary side
Imitate impedance ZfIncrease, the both end voltage of primary side transmitting coil can all be made to increase, and then increase the output current of inverter, this will
The switching device of inverter is had a huge impact, in some instances it may even be possible to the switching device of inverter can be damaged.
Invention content
In view of this, the present invention proposes a kind of electric energy transmitting terminal and wireless charging device, when the two of primary side resonant network
When terminal voltage is higher than preset voltage value, then the portion of energy of transmitting coil is fed back to by input side by energy back circuit
In input power, to maintain the both end voltage of the primary side resonant network in preset voltage value or hereinafter, will not cause to inverse
Become the increase of the output power of circuit.
A kind of electric energy transmitting terminal according to the present invention, to transmit energy to the electric energy receiving terminal being isolated from it, including it is inverse
It further includes energy back circuit to become circuit and primary side resonant network, the electric energy transmitting terminal,
The inverter circuit receives external input power, and primary side resonant network is supplied to generate alternating voltage signal,
The primary side resonant network includes primary side transmitting coil and primary side resonant capacitance, and the primary side resonant network receives institute
It states alternating voltage signal and is transferred to the electric energy receiving terminal to generate space magnetic field；
The energy back circuit detects the voltage signal for characterizing the primary side resonant network both end voltage higher than default
Voltage value when, then by the energy back circuit by the energy back of the primary side transmitting coil to the input power,
So that the both end voltage of the primary side resonant network is no more than the preset voltage value.
Further, the electric energy transmitting terminal further includes that emission current adjusts circuit, and the emission current adjusts circuit and connects
It is connected between the inverter circuit and the primary side resonant network, the emission current adjusts circuit to adjust the primary side hair
The electric current of ray circle, so that it is constant current value.
Preferably, the energy back circuit includes at least the first diode,
First diode is connected between the primary side resonant network and the input power, so that the primary side
The energy of transmitting coil unidirectionally feeds back to the input power.
Preferably, the anode of first diode is connected to the input terminal of the primary side resonant network to obtain characterization institute
The voltage signal of primary side resonant network both end voltage is stated, cathode is connected to the input power.
Further, the energy back circuit includes the peak detection electricity being made of third diode and the first capacitance
Road,
The third diode and first capacitance series connection after reconnect the primary side resonant network input terminal and
Between reference ground, also, the anode of the third diode connects the input terminal of the primary side resonant network, and cathode connects institute
State one end of the first capacitance.
Preferably, the anode of first diode is connected to the points of common connection of the third diode and the first capacitance
To obtain the voltage signal for characterizing the primary side resonant network both end voltage, cathode is connected to the input power.
Further, the energy back circuit includes Zener diode,
The Zener diode is connected between first diode and input power, also, the Zener diode
Anode connect the input power, cathode is connected to the cathode of first diode；
Or the Zener diode is connected between the input terminal and the first diode of the primary side resonant network, and
And the anode of the Zener diode is connected to the anode of first diode, cathode is connected to the primary side resonant network
Input terminal.
Further, the energy back circuit includes the first capacitance, first switch pipe, the second diode and the first electricity
Sense,
First capacitance connection is between the cathode and reference ground of first diode；
First polarity of the first switch pipe terminates the voltage output end of first capacitance, and the second polar end is connected to
The first end of first inductance, the first switch pipe control its switch motion by controllable duty cycle signals；
The second end of first inductance is connected to the input power；
The cathode of second diode is connected to the commonly connected of the first end of the first switch pipe and the first inductance
Point, anode are connected to reference ground；
Wherein, the first switch pipe, the second diode and the first inductance constitute voltage-dropping type voltage conversion circuit.
Further, the energy back circuit includes the first hysteresis comparator and second switch pipe,
The first input end of first hysteresis comparator is connected to the public company of the third diode and the first capacitance
Contact, the second input terminal receive the first reference voltage signal；
The second switch pipe is connected between the cathode and the input power of first diode, and described first late
The output signal of stagnant comparator controls the switch motion of the second switch pipe.
Further, the energy back circuit includes first resistor, the second hysteresis comparator and third switching tube,
The first end of the first resistor is connected to the voltage output end of first capacitance, the second termination reference ground；
The first input end of second hysteresis comparator is connected to the public company of the third diode and the first capacitance
For contact to obtain the voltage signal of characterization primary side resonant network both end voltage, the second input terminal receives the first reference voltage signal；
The second switch pipe is connected between the cathode and the input power of first diode, and described first late
The output signal of stagnant comparator controls the switch motion of the second switch pipe.
The anode of first diode is connected to the input terminal of the primary side resonant network so that the primary side emits
The energy back of coil is to the input power.
A kind of wireless charging device according to the present invention includes the electric energy transmitting terminal and electric energy receiving terminal of isolation, the electricity
Energy transmitting terminal is above-mentioned electric energy transmitting terminal；The electric energy receiving terminal includes secondary side resonant network and current rectifying and wave filtering circuit, described
Secondary side resonant network incudes the alternating magnetic field that the primary side transmitting coil generates, to obtain corresponding alternating voltage, the rectification
The alternating voltage is converted to suitable DC voltage and supplies output loading by filter circuit.
According to above-mentioned electric energy transmitting terminal and wireless charging device, when the both end voltage of primary side resonant network increases, then
The portion of energy of transmitting coil is fed back in input power by energy back circuit, so that the both end voltage of transmitting coil
It maintains preset voltage value or hereinafter, the increase to the output power of inverter circuit will not be caused, thus inversion can be protected
Switching device in circuit.And technical scheme of the present invention can allow the energy being higher by be back in input power, energy profit
With rate height, it can not only protect circuit but also efficiency can be improved.
Description of the drawings
Fig. 1 show a kind of circuit diagram of wireless charging device in the prior art；
Fig. 2 show the equivalent impedance schematic diagram of circuit shown in Fig. 1；
Fig. 3 show the circuit diagram of the first embodiment of wireless charging device according to the present invention；
Fig. 4 show the circuit diagram of the second embodiment of wireless charging device according to the present invention；
Fig. 5 show the circuit diagram of the 3rd embodiment of wireless charging device according to the present invention；
Fig. 6 show the circuit diagram of the fourth embodiment of wireless charging device according to the present invention；
Fig. 7 show the circuit diagram of the 5th embodiment of wireless charging device according to the present invention；
Fig. 8 show the circuit diagram of the sixth embodiment of wireless charging device according to the present invention.
Specific implementation mode
Several preferred embodiments of the present invention are described in detail below in conjunction with attached 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.In order to make the public have thorough understanding to the present invention, it is described in detail in following present invention 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 diagram of the first embodiment of wireless charging device according to the present invention, nothing of the invention are shown with reference to figure 3
Micro USB electric installation includes the electric energy transmitting terminal of isolation and electric energy receiving terminal, the electric energy transmitting terminal include that inverter circuit and primary side are humorous
Vibrating network, the inverter circuit receive external input power VDC, primary side resonant network is supplied to generate alternating voltage signal, it is described
Primary side resonant network includes primary side transmitting coil Ls and primary side resonant capacitance Cs, and the primary side resonant network receives the alternation electricity
Pressure signal is transferred to the electric energy receiving terminal to generate space magnetic field；The electric energy receiving terminal includes secondary side resonant network (inductance
Ld and capacitance Cd) and current rectifying and wave filtering circuit (not shown), pair side resonant network incudes what the primary side transmitting coil generated
Alternating magnetic field, to obtain corresponding alternating voltage, the alternating voltage is converted to suitable direct current by the current rectifying and wave filtering circuit
Voltage VACdSupply output loading.
In embodiments of the present invention, the electric energy transmitting terminal further comprises emission current adjusting circuit (in such as Fig. 3
It is made of inductance Lc and capacitance Cc), the emission current adjusting is electrically connected to the inverter circuit and the primary side Resonance Neural Network
Between network, the emission current adjusts circuit to adjust the electric current of the primary side transmitting coil, so that it is constant current
Value.
Further, the electric energy transmitting terminal further includes energy back circuit, and the energy back circuit detects characterization
It, then will by the energy back circuit when voltage signal of the primary side resonant network both end voltage is higher than preset voltage value
The energy back of the primary side transmitting coil is to the input power, so that the input terminal voltage of the primary side resonant network is not
More than the preset voltage value.
As shown in figure 3, the energy back circuit in the present embodiment includes the first diode D1, the first diode D1's
Anode is connected to the input terminal of the primary side resonant network, to obtain the voltage signal of characterization primary side resonant network both end voltage
Vs, cathode are connected to the anode of the input power.
During the work time, when primary impedance is abnormal, not such as transmitting coil impedance Ls and resonant capacitance Cs impedances
Match, or the load of secondary side increases, when leading to secondary side power demand higher than setting performance number, then the voltage at primary side resonant network both ends
Vs can be increased, when the voltage Vs at resonant network both ends rises above the voltage V of input powerDCWhen (i.e. preset voltage value),
Then the first diode D1 will be connected, portion of electrical current IfThe input side of input power is fed back to by the first diode D1, until
The input terminal voltage of transmitting coil is reduced to preset voltage value.Pass through above-mentioned energy back circuit clamping Resonance Neural Network as a result,
The voltage at network both ends is increased so that inverter circuit will not export excessively high power with limiting energy in transmitting coil.This hair simultaneously
The energy of transmitting coil may make unidirectionally to feed back to input as energy back circuit using the first diode in bright embodiment
End, the reflux without causing energy.
In the above-described embodiments, if the supply voltage of input side is relatively low, and when secondary side output power is higher, then primary side
Transmitting coil can may be illustrated in figure 4 in limited current state for this purpose, inventor advanced optimizes energy back circuit always
The circuit diagram of the second embodiment of wireless charging device according to the present invention, the present embodiment be on the basis of a upper embodiment,
Further comprise Zener diode DZ, Zener diode DZIt is connected to the first diode D1 and input power VDCBetween, and
And Zener diode DZAnode connect the input power VDC, cathode is connected to the cathode of the first diode D1.
If the breakdown voltage of Zener diode DZ is VZ, only when the voltage in primary side resonant network both ends is more than VZ+VDC
(i.e. Vs>VZ+VDC) when, the first diode D1 can just be connected, portion of electrical current IfPass through the first diode D1 and Zener diode DZIt returns
It is fed to the input power of input side, voltage V in the present embodimentZ+VDCAnd be preset voltage value.Moreover, different by selecting
The Zener diode of breakdown voltage value can adjust the voltage limiting value of primary side resonant network, to control the end electricity of primary side resonant network
It is pressed in different preset voltage values.
Skilled person will appreciate that the Zener diode DZThe first diode D1 and primary side can also be connected to
Between resonant network, such as Zener diode DZAnode connect the anode of the first diode D1, described in cathode connection
The input terminal of primary side resonant network, operation principle are same as above, and are repeated no more.
And due to Zener diode DZThere are energy losses for itself, small, energy-controllable feedback circuit are lost to realize, hair
A person of good sense continues to provide a kind of energy by conversion switch control feedback, is illustrated in figure 5 according to the present invention wireless
The circuit diagram of the 3rd embodiment of charging unit, the present embodiment are on the basis of Fig. 3 embodiments, and the energy back circuit is also
Include the voltage conversion circuit being made of the first capacitance C1, first switch pipe S1, the second diode D2 and the first inductance L1, it is described
First capacitance C1 is connected between the cathode and reference ground of first diode；The first polarity of the first switch pipe S1
The voltage output end of the first capacitance C1 is terminated, the second polar end is connected to the first end of the first inductance L1, and described first opens
It closes pipe S1 and its switch motion is controlled by controllable duty cycle signals D；The second end of first inductance L1 is connected to the input electricity
Source；The cathode of the second diode D2 is connected to the points of common connection of the first end of the first switch pipe and the first inductance,
Anode is connected to reference ground；Wherein, the first switch pipe S1, the second diode D2 and the first inductance L1 constitute voltage-dropping type electricity
Voltage conversion circuit.
In circuit shown in Fig. 5, when the voltage at primary side resonant network both ends is more than Vin, the value of voltage Vin is preset
Input terminal voltage Vin is converted to output end voltage by voltage value, the first diode D1 conductings, voltage-dropping type voltage conversion circuit, because
The input terminal of input power is connected to for output end, therefore output end voltage is steady state value VDC, in this way, can then be accounted for by control
Sky adjusts the input terminal voltage Vin of voltage conversion circuit than signal D, is, in the present embodiment preset voltage value be can
It adjusts, can be needed according to the power of load and the output power of inverter is arranged to adjust.And due to first switch pipe S1,
The energy consumption of the devices such as two diodes is smaller, not only preferably realizes the feedback of energy, can also reduce loss.
The feedback regulation of transmitting coil energy is realized in above-described embodiment well, but those skilled in the art can
Know, since the emission current of transmitting coil is sine-wave current, and the capacitance that emission current adjusts the capacitance Cc in circuit is smaller,
Therefore, it is possible that instantaneous energy overshoots, in order to make energy back more smooth steady, this reality during energy back
The peak detection circuit for increasing in example and being made of third diode Dp and the first capacitance Cp is applied, is illustrated in figure 6 according to this hair
After the circuit diagram of the fourth embodiment of bright wireless charging device, the third diode Dp and the first capacitance Cp series connection again
It is connected between the input terminal and reference ground of the primary side resonant network, also, the anode connection of the third diode Dp
The input terminal of the primary side resonant network, cathode connect one end of the first capacitance Cp.
The energy back circuit of the present embodiment equally includes the first diode D1, and the anode of the first diode D1 is connected to institute
The points of common connection of third diode Dp and the first capacitance Cp are stated to receive the characterization primary side resonant network both end voltage
Voltage signal Vs, cathode connects the anode of input side input power.The capacitance of first capacitance Cp described here is larger, thus can obtain
The peak signal for obtaining primary side resonant network both end voltage, is voltage signal Vs.Likewise, when voltage signal Vs reaches input electricity
The voltage V in sourceDCWhen (i.e. preset voltage value), then the first diode D1 can be connected, portion of electrical current IfPass through the first diode D1
The input side of input power is fed back to, until the both end voltage of primary side resonant network is reduced to preset voltage value.The present embodiment
The electric current in limitation transmitting coil can be equally obtained, prevents inverter circuit from the advantageous effect of high-power output occur, in addition, this
Inventive embodiments may make the energy more smooth steady that transmitting coil is fed back.
It should be noted that the energy back circuit of above-mentioned second embodiment and 3rd embodiment can be with the 4th in fact
The energy back circuit applied in example is used in combination, for example, the anode of first diode is connected to the three or two pole
The points of common connection of pipe Dp and the first capacitance Cp characterize the voltage signal Vs of the primary side resonant network both end voltage to obtain, it
Afterwards, then by by Zener diode DZThe energy back circuit constituted with the first diode D1 is either by by the voltage-dropping type
The energy back circuit that voltage conversion circuit and the first diode D1 are constituted come to by the energy back of primary side transmitting coil to defeated
Enter power supply, to obtain the advantageous effect of feedback energy smooth steady.
Finally, the present invention provides it is a kind of by sluggishness relatively in the way of carry out the feedback of energy, be illustrated in figure 7 according to
According to the circuit diagram of the 5th embodiment of the wireless charging device of the present invention, illustrated by taking Fig. 7 as an example, the energy in the present embodiment
Feedback circuit includes the first diode D1, third diode Dp and the first capacitance Cp, the third diode Dp and described first
Capacitance Cp is identical as the connection type in fourth embodiment, and the anode connection of the first diode D1 is the three or two pole
The points of common connection of pipe Dp and the first capacitance Cp are to receive the voltage signal Vs of characterization primary side resonant network both end voltage.Further
, energy back circuit further comprises the first hysteresis comparator CH1 and second switch pipe S2 in the present embodiment, and described first late
The first input end of stagnant comparator CH1 is connected to the points of common connection of the third diode Dp and the first capacitance Cp to connect
Voltage signal Vs is received, it is default that the second input terminal, which receives the first reference voltage signal Vref, the first reference voltage signal Vref,
Voltage value, can size be set according to the output power of the bearing power on secondary side and inverter circuit.The second switch pipe S2
It is connected between the cathode and the input power of first diode, the output signal control of first hysteresis comparator
The switch motion of the second switch pipe S2.
In the present embodiment, during the work time, as voltage signal VSWhen more than Vref, the S2 conductings of second switch pipe, portion
Divide electric current IfInput side input power is fed back to by the first diode D1 and second switch pipe S2；Work as VS<Vref-ΔV(ΔV
For the stagnant loop voltag of hysteresis comparator) when, the S2 shutdowns of second switch pipe may make primary side resonant network by stagnant ring feedback control
Both end voltage always near the first reference voltage Vref, to limit the electric current in primary side transmitting coil scheduled
Value.
Further, Fig. 8 show the circuit diagram of the sixth embodiment of wireless charging device according to the present invention.In Fig. 8
Shown in embodiment shown in embodiment circuit structure and Fig. 7 the first diode D1, third diode Dp and the first capacitance Cp
The energy back circuit of connection type all same, embodiment shown in Fig. 8 further includes first resistor R1, the second hysteresis comparator
The first end of CH2 and third switching tube S3, the first resistor R1 are connected to the voltage output end of the first capacitance Cp, and second
Terminate reference ground；The first terminal voltage of first capacitance Cp is the voltage signal Vs for the both end voltage for characterizing primary side resonant network,
In the present embodiment, the first input end of the second hysteresis comparator CH2 is connected to the voltage output of the first capacitance Cp
End, it is preset voltage value that the second input terminal, which receives the first reference voltage signal Vref, the first reference voltage signal Vref, can
It is arranged according to the output power of the bearing power on secondary side and inverter circuit；The third switching tube S3 is connected to the described 1st
Between the cathode of pole pipe and the input power, the output signal of second hysteresis comparator controls the third switching tube S3
Switch motion.In the present embodiment, the anode of the first diode D1 be connected to the input terminal of primary side resonant network so that
In the energy back to input power of the transmitting coil.
In the present embodiment, during the work time, as voltage signal VSWhen more than the first reference voltage signal Vref, third
Switching tube S3 is connected, the portion of electrical current I in primary side transmitting coilfIt is fed back to by the first diode D1 and third switching tube S3 defeated
Enter the input power of side, meanwhile, the energy in the first capacitance Cp is released by first resistor R1；Work as VS<Vref-Δ
When V (Δ V is the stagnant loop voltag of hysteresis comparator), the S3 shutdowns of third switching tube may make the first electricity by stagnant ring feedback control
What the output end voltage of appearance was characterized always near the first reference voltage Vref, due to the output end voltage of the first capacitance is primary side
The peak signal of resonant network both end voltage, therefore the both end voltage of primary side resonant network is also always in the first reference voltage Vref
Near, it is no more than scheduled value to limit the electric current in primary side transmitting coil.
In conclusion the electric energy transmitting terminal and wireless charging device of the present invention, when the both end voltage liter of primary side resonant network
Gao Shi is then fed back to the portion of energy of transmitting coil in input power by energy back circuit, so that transmitting coil
Both end voltage maintains preset voltage value or hereinafter, the increase to the output power of inverter circuit will not be caused, thus can be with
Protect the switching device in inverter circuit.And technical scheme of the present invention can allow energy to be back in input power, energy
Utilization rate is high, can not only protect circuit but also can utilize energy.
Detailed description has been carried out to the electric energy transmitting terminal and wireless charging device of preferred embodiment according to the present invention above,
Those of ordinary skill in the art can deduce that other technologies or equivalent structure etc. can be applied to the embodiment accordingly.
As described above according to the embodiment of the present invention, there is no all details of detailed descriptionthe for these embodiments, also not
Limit the specific embodiment that the invention is only described.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is in order to preferably explain the principle of the present invention and practical application, belonging to making
Technical field technical staff can utilize modification of the invention and on the basis of the present invention to use well.The present invention is only by right
The limitation of claim and its full scope and equivalent.
Claims (7)
1. a kind of electric energy transmitting terminal, to transmit energy to the electric energy receiving terminal being isolated from it, including inverter circuit and primary side it is humorous
Vibrating network, which is characterized in that the electric energy transmitting terminal further includes energy back circuit,
The inverter circuit receives external input power, and primary side resonant network is supplied to generate alternating voltage signal,
The primary side resonant network includes primary side transmitting coil and primary side resonant capacitance, and the primary side resonant network receives the friendship
Time variant voltage signal is transferred to the electric energy receiving terminal to generate space magnetic field；
The energy back circuit detects that the voltage signal for characterizing the primary side resonant network both end voltage is higher than preset electricity
When pressure value, then by the energy back circuit by the energy back of the primary side transmitting coil to the input power so that
The both end voltage for obtaining the primary side resonant network is no more than the preset voltage value；
The peak detection electricity that the energy back circuit includes the first diode and is made of third diode and the first capacitance
Road,
Input terminal and the reference in the primary side resonant network are reconnected after the third diode and first capacitance series connection
Between ground terminal, also, the anode of the third diode connects the input terminal of the primary side resonant network, cathode connection described the
One end of one capacitance；
The anode of first diode is connected to the points of common connection of the third diode and the first capacitance to be characterized
The voltage signal of the primary side resonant network both end voltage, cathode are connected to the input power.
2. electric energy transmitting terminal according to claim 1, which is characterized in that the electric energy transmitting terminal further includes emission current tune
Economize on electricity road, the emission current adjusting are electrically connected between the inverter circuit and the primary side resonant network, the transmitting
Current regulating circuit is to adjust the electric current of the primary side transmitting coil, so that it is constant current value.
3. electric energy transmitting terminal according to claim 1, which is characterized in that the energy back circuit further comprises Zener
Diode,
The Zener diode is connected between first diode and input power, also, the sun of the Zener diode
Pole connects the input power, and cathode is connected to the cathode of first diode；
Or the Zener diode is connected between the input terminal and the first diode of the primary side resonant network, also, institute
The anode for stating Zener diode is connected to the anode of first diode, and cathode is connected to the input of the primary side resonant network
End.
4. electric energy transmitting terminal according to claim 1, which is characterized in that the energy back circuit further comprises first
Capacitance, first switch pipe, the second diode and the first inductance,
First capacitance connection is between the cathode and reference ground of first diode；
First polarity of the first switch pipe terminates the voltage output end of first capacitance, and the second polar end is connected to first
The first end of inductance, the first switch pipe control its switch motion by controllable duty cycle signals；
The second end of first inductance is connected to the input power；
The cathode of second diode is connected to the points of common connection of the first end of the first switch pipe and the first inductance, sun
Pole is connected to reference ground；
Wherein, the first switch pipe, the second diode and the first inductance constitute a voltage-dropping type voltage conversion circuit.
5. electric energy transmitting terminal according to claim 1, which is characterized in that the energy back circuit further comprises first
Hysteresis comparator and second switch pipe,
The first input end of first hysteresis comparator is connected to the public company of the third diode and the first capacitance
Contact, the second input terminal receive the first reference voltage signal；
The second switch pipe is connected between the cathode and the input power of first diode, the described first sluggish ratio
Compared with the switch motion that the output signal of device controls the second switch pipe.
6. electric energy transmitting terminal according to claim 1, which is characterized in that the energy back circuit further comprises first
Resistance, the second hysteresis comparator and third switching tube,
The first end of the first resistor is connected to the voltage output end of first capacitance, the second termination reference ground；
The first input end of second hysteresis comparator is connected to the points of common connection of the third diode and the first capacitance
To obtain the voltage signal of characterization primary side resonant network both end voltage, the second input terminal receives the first reference voltage signal；
The third switching tube is connected between the cathode and the input power of first diode, the described second sluggish ratio
Compared with the switch motion that the output signal of device controls the third switching tube；
The anode of first diode is connected to the input terminal of the primary side resonant network so that the primary side transmitting coil
Energy back to the input power.
7. a kind of wireless charging device includes the electric energy transmitting terminal and electric energy receiving terminal of isolation, which is characterized in that
The electric energy transmitting terminal is claim 1-6 any one of them electric energy transmitting terminals；
The electric energy receiving terminal includes secondary side resonant network and current rectifying and wave filtering circuit, and pair side resonant network incudes the primary side
The alternating magnetic field that transmitting coil generates, to obtain corresponding alternating voltage, the current rectifying and wave filtering circuit turns the alternating voltage
It is changed to suitable DC voltage supply output loading.
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| CN201510828110.1A CN105391192B (en) | 2015-11-24 | 2015-11-24 | A kind of electric energy transmitting terminal and wireless charging device |
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| CN201510828110.1A CN105391192B (en) | 2015-11-24 | 2015-11-24 | A kind of electric energy transmitting terminal and wireless charging device |
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|---|---|---|---|---|
| CN107342632A (en) * | 2016-05-03 | 2017-11-10 | 宁波微鹅电子科技有限公司 | A kind of electric energy emitting structural and apply its wireless charging device |
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| CN109149786A (en) * | 2017-06-26 | 2019-01-04 | 北京中诺电力工程有限公司 | A kind of magnetic induction mobile phone wireless charging emitter |
| CN110014898A (en) * | 2017-12-25 | 2019-07-16 | 中惠创智无线供电技术有限公司 | A kind of method of wireless charging, vehicle mounted battery management system and electric vehicle |
| CN108297731B (en) * | 2018-03-20 | 2023-10-13 | 广东工业大学华立学院 | Wireless charging system of electric automobile |
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| US7772782B2 (en) * | 2007-12-05 | 2010-08-10 | Leadtrend Technology Corp. | Light emitting diode (LED) driving device |
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| US5140510A (en) * | 1991-03-04 | 1992-08-18 | Motorola, Inc. | Constant frequency power converter |
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