CN109193965B - Blocking type parallel resonance wireless charging transmitting terminal - Google Patents

Blocking type parallel resonance wireless charging transmitting terminal Download PDF

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Publication number
CN109193965B
CN109193965B CN201811141958.7A CN201811141958A CN109193965B CN 109193965 B CN109193965 B CN 109193965B CN 201811141958 A CN201811141958 A CN 201811141958A CN 109193965 B CN109193965 B CN 109193965B
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mos transistor
capacitor
module
parallel resonance
inductor
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CN109193965A (en
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杨奕
李茂丽
王玉菡
鲁亮
张葛
郭家嘉
张鑫
黄升
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Chongqing University of Technology
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Chongqing University of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a blocking type parallel resonance wireless charging transmitting terminal which comprises a decoupling module, a controllable buck-boost module and a parallel resonance module which are sequentially connected, wherein the parallel resonance module comprises an inductor L1, a capacitor C1, a capacitor C2 and an MOS tube Q5, a series branch is formed by the inductor L1 and the capacitor C2 and is connected between the output end and the grounding end of the controllable buck-boost module, the MOS tube Q5 is connected at two ends of the capacitor C2 in parallel, the drain electrode of the MOS tube Q5 is connected with the common connecting end of the inductor L1 and the capacitor C2, the source electrode of the MOS tube Q5 is grounded, and the capacitor C1, the inductor L1 and the capacitor C2 are formed into a series branch which is integrally connected in parallel. The invention has the advantages of separating the AC path from the DC path, avoiding AC and DC mixing, stabilizing input current, being easy to measure and monitor, high charging efficiency and the like.

Description

Blocking type parallel resonance wireless charging transmitting terminal
Technical Field
The invention relates to the technical field of wireless charging, in particular to a blocking type parallel resonance wireless charging transmitting terminal.
Background
As a novel charging mode, the wireless charging technology can realize the transmission of electric energy from a power supply to a load only through the conversion of an electric field and a magnetic field in space without electrical contact, and overcomes the defects of easy friction, aging and the like of the traditional wired charging.
The magnetic coupling resonance type wireless charging technology is based on the electromagnetic induction principle, and realizes wireless charging on a load end by applying a variable current in a sending coil to generate a variable electromagnetic field, coupling the variable electromagnetic field to a receiving coil and generating a charging current in the receiving coil. The existing wireless charging transmitting terminal mainly adopts a series resonance circuit and a parallel resonance circuit, but the charging efficiency is lower due to the adoption of the series resonance circuit. And adopt parallel resonance circuit, then have alternating current-direct current mixed phenomenon for the transmitting terminal input current ripple is obvious, influences charge efficiency, and input current is not suitable for the measurand control.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide one kind and to separate interchange route and direct current route, avoid the alternating current-direct current to mix, make input current steady, easily measure the control, the wireless transmitting terminal that charges of the type parallel resonance that separates that charge efficiency is high.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a block direct type parallel resonance wireless transmitting terminal that charges, its characterized in that, is including the controllable buck-boost module and the parallel resonance module that connect gradually the setting, the parallel resonance module includes inductance L1, electric capacity C1, electric capacity C2 and MOS pipe Q5, and wherein inductance L1 and electric capacity C2 constitute the series branch and connect between the output and the earthing terminal of controllable buck-boost module, MOS pipe Q5 connects in parallel at electric capacity C2's both ends, and MOS pipe Q5's drain-electrode and inductance L1 and electric capacity C2's public link to each other, MOS pipe Q5's source ground connection, electric capacity C1 constitutes the whole parallelly connected of series branch with inductance L1 and electric capacity C2.
Further, the controllable buck-boost module includes a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q3, a MOS transistor Q4, an inductor L2, and a capacitor C3, a drain of the MOS transistor Q1 is connected to an output terminal of the decoupling module, a source of the MOS transistor Q1 is connected to a drain of the MOS transistor Q3, a source of the MOS transistor Q2 is connected to a drain of the MOS transistor Q4, one end of the inductor L2 is connected to the source of the MOS transistor Q1 and the drain of the MOS transistor Q3, and the other end is connected to the source of the MOS transistor Q2 and the drain of the MOS transistor Q4;
one end of the capacitor C3 and the source of the MOS transistor Q3 and the source of the MOS transistor Q4 are grounded, and the other end of the capacitor C3 and the drain of the MOS transistor Q2 are connected to the input end of the parallel resonance module as the output end of the controllable buck-boost module.
Furthermore, the device also comprises a decoupling module arranged at a power supply end, wherein the decoupling module comprises a plurality of decoupling capacitors arranged in parallel.
Further, the decoupling capacitors are provided with 5 decoupling capacitors C4 of 470 muF, C5 of 22 muF, C6 of 0.02 muF, C7 of 0.1 muF and C8 of 10 muF.
In conclusion, the invention has the advantages of separating the AC path from the DC path, avoiding the mixing of AC and DC, stabilizing the input current, being easy to measure and monitor, having high charging efficiency and the like.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 to 5 are schematic diagrams illustrating dynamic analysis of the controllable buck-boost module according to the present invention.
Fig. 6 to 9 are schematic diagrams illustrating modal analysis of the parallel resonant module according to the present invention.
Fig. 10 is a waveform diagram of the change of the operating current and voltage of each part of the parallel resonance module in the invention.
Fig. 11 to 15 are schematic diagrams illustrating a modal analysis of a parallel resonant module in the prior art.
Fig. 16 is a waveform diagram of the operating current and voltage variation of each part of the parallel resonant module in the prior art.
Fig. 17 is a schematic diagram of a charging simulation performed by using the transmitting terminal of the present application.
Fig. 18 is a waveform diagram of the transmitting end of fig. 17.
Fig. 19 is a schematic diagram of a charging simulation using a conventional transmitting terminal.
Fig. 20 is a waveform diagram of the transmitting end of fig. 19.
Detailed Description
The present invention will be described in further detail with reference to examples.
In the specific implementation: as shown in fig. 1, a blocking type parallel resonance wireless charging transmitting terminal includes a decoupling module 1, a controllable buck-boost module 2 and a parallel resonance module 3, which are sequentially connected, where the parallel resonance module 3 includes an inductor L1, a capacitor C1, a capacitor C2 and a MOS transistor Q5, where the inductor L1 and the capacitor C2 form a series branch connected between an output end and a ground end of the controllable buck-boost module, the MOS transistor Q5 is connected in parallel to both ends of the capacitor C2, a drain of the MOS transistor Q5 is connected to a common connection end of the inductor L1 and the capacitor C2, a source of the MOS transistor Q5 is grounded, and the capacitor C1, the inductor L1 and the capacitor C2 form a series branch connected in parallel.
The controllable buck-boost module 2 comprises a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q3, a MOS transistor Q4, an inductor L2 and a capacitor C3, wherein a drain of the MOS transistor Q1 is connected with an output end of the decoupling module 1, a source of the MOS transistor Q1 is connected with a drain of the MOS transistor Q3, a source of the MOS transistor Q2 is connected with a drain of the MOS transistor Q4, one end of the inductor L2 is connected to the source of the MOS transistor Q1 and the drain of the MOS transistor Q3, and the other end of the inductor L2 is connected to the source of the MOS transistor Q2 and the drain of the MOS transistor Q4; one end of the capacitor C3 and the source of the MOS transistor Q3 and the source of the MOS transistor Q4 are grounded, and the other end of the capacitor C3 and the drain of the MOS transistor Q2 are connected to the input end of the parallel resonant module 3 as the output end of the controllable buck-boost module 2. The decoupling module 1 comprises a plurality of decoupling capacitors arranged in parallel, as shown in fig. 1, a decoupling capacitor C4 of 470 muf, a decoupling capacitor C5 of 22 muf, a decoupling capacitor C6 of 0.02 muf, a decoupling capacitor C7 of 0.1 muf and a decoupling capacitor C8 of 10 muf respectively, and by using the decoupling module, a stable power supply can be provided, noise of a component coupled to a power supply end can be reduced, and influence of noise of the component on other components can be indirectly reduced.
As shown in fig. 2 to 5, the controllable buck-boost module includes four MOS switch transistors, forming an H-bridge. The output voltage is changed by changing the conduction states of the MOS transistors Q1-Q4.
As shown in fig. 2 and 3, when the MOS transistor Q2 is turned on and the MOS transistor Q4 is turned off, the MOS transistor Q1, the MOS transistor Q3, and the inductor L2 together form a BUCK circuit. During operation, the MOS transistor Q1 and the MOS transistor Q3 are alternately conducted.
As shown in fig. 2, when the MOS transistor Q1 is turned on and the MOS transistor Q3 is turned off, the power supply charges the inductor L2 through the MOS transistor Q1, the inductor L2 stabilizes the output current, and the capacitor C3 stabilizes the output voltage.
As shown in fig. 3, when MOS transistor Q3 is on and MOS transistor Q1 is off, MOS transistor Q3 functions as a freewheeling diode, inductor L2 stabilizes the output current via MOS transistor Q3, and capacitor C3 stabilizes the output voltage.
As shown in fig. 4 and 5, when the MOS transistor Q1 is turned on and the MOS transistor Q3 is turned off, the MOS transistor Q2, the MOS transistor Q4, and the inductor L2 together form a BOOST circuit. During operation, the MOS transistor Q2 and the MOS transistor Q4 are alternately conducted.
As shown in fig. 4, when the MOS transistor Q4 is turned on and the MOS transistor Q2 is turned off, the power source charges the inductor L2 through the MOS transistor Q4, and the capacitor C3 stabilizes the output voltage.
As shown in fig. 5, when MOS transistor Q2 is on and MOS transistor Q4 is off, MOS transistor Q2 functions as a freewheeling diode, and the power supply is connected in series with inductor L2 and stably outputs through MOS transistor Q2, and capacitor C3 stably outputs a voltage.
As shown in fig. 6 to 10, the dc blocking capacitor C1 is provided to separate the ac path from the dc path, so that the ripple of the input current and voltage can be removed, the mixing of ac and dc can be avoided, the input current is stable, the measurement and monitoring are easy, and the charging efficiency is high.
As shown in fig. 6 and 10, at t0 to t1, MOS transistor Q5 is turned on, and current starts to flow through MOS transistor Q5. Under the action of the inductor L1, the current iLStarting to increase linearly to form a power supply Vg->Inductance L1->MOS transistor Q5->And a ground D loop.
As shown in fig. 7 and 10, in t 1-t 2, MOS transistor Q5 is turned off, the direction of the current in the inductor is unchanged, the magnitude of the current gradually decreases, and the power supply current is the same as the inductor current. The charge is accumulated on the lower side of the capacitor, thereby raising the voltage below the capacitor. The inductor gradually converts all energy to the capacitor. The circuit loop is power supply- > inductor L1- > capacitor C1- > ground.
As shown in fig. 8 and 10, the MOS transistor Q5 is still turned off from t2 to t 3. Since the capacitor is full of energy in the previous stage, the capacitor discharges to the inductor. The voltage at the lower side of the capacitor (the D pole of the MOS tube) is reduced, and the capacitor transfers energy to the upper side of the inductor.
As shown in FIGS. 9 and 10, the capacitance C is within the range from t3 to t41The lower side voltage is reduced to 0, the MOS transistor Q5 is turned on, the current direction of the inductor L1 is consistent with that of the upper stage and is in a decreasing trend, and the power supply current is consistent with the inductor current all the time. The inductive current flows to the power supplyThe inductance energy is gradually reduced to 0, and the inductance energy is released completely. The circuit loop at this time is: MOS transistor Q5->Inductance L1->Power supply Vg。
As shown in fig. 11 to 16, a schematic diagram of modal analysis and a waveform diagram of a parallel resonance module in the prior art are shown, and it can be seen from the diagrams that the basic modes of the two circuits are the same, the greatest difference is that power supply current ripple is eliminated in the blocking type parallel resonance mobile phone wireless charging transmitting end resonance module, and the waveform is almost the same as the inductive current, which is convenient for measurement.
As shown in fig. 17, simulation analysis was performed on the improved basic circuit by Multisim circuit simulation software, in which the voltage of the simulated dc voltage source is 8V, and the resonant inductor L is1Is 7 muH, filter capacitor C1And a resonance capacitor C2Are all 0.055 muF, and the switching frequency is set to 200 KHz. Receiving end resonance inductance L5Is 7 muH, resonant capacitor C90.094. mu.F. Switching tubes Q7, Q9 and L3Form a synchronous rectification circuit, wherein L3300 muH. The receiving end DC-DC conversion circuit uses a module LM7815 in simulation, and the load resistance is 15 omega. The waveform of the input end of the resonant circuit obtained by simulation is shown in fig. 18, wherein the abscissa of the graph is time, and the ordinate of the graph is equivalent current value, and the unit is 1V/mA. The input voltage of 8V and the input current of 1.88A of the improved system during charging can be known through simulation software; the output voltage is 14.1V, and the output current is 0.964A. The charging efficiency of the improved system was calculated to be 90.4%.
The basic topology simulation of the emitting end before improvement is shown in fig. 19, the voltage of the simulated direct-current voltage source is 8V, and the resonant inductor L of the emitting end1Is 7 muH, resonant capacitor C10.11 muF, and the switching frequency was set to 200 KHz. The receiving end resonant circuit and the later stage synchronous rectification circuit are not changed, the waveform of the input end of the resonant circuit obtained by simulation is shown in figure 20, the abscissa in the figure is time, the ordinate is equivalent current value, and the unit is 1V/mA. The input voltage of 8V and the input current of 1.79A of the system before improvement can be obtained through simulation software during charging; the output voltage is 12.8V, and the output current is 0.866A. The charging efficiency of the system before improvement was found to be 77.4% by calculation. It can be seen that after improvementThe charging efficiency of the transmitting terminal is greatly improved.
The above description is only exemplary of the present invention and should not be taken as limiting, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (3)

1. The utility model provides a block wireless transmitting terminal that charges of direct type parallel resonance, its characterized in that, including decoupling module (1), controllable buck-boost module (2) and the parallel resonance module (3) that connect gradually the setting, decoupling module (1) includes a plurality of decoupling capacitance of parallel arrangement, parallel resonance module (3) include inductance L1, electric capacity C1, electric capacity C2 and MOS pipe Q5, wherein inductance L1 and electric capacity C2 constitute the series branch and connect between the output of controllable buck-boost module (2) and earthing terminal, MOS pipe Q5 connects in parallel at electric capacity C2's both ends, and MOS pipe Q5's drain and inductance L1 and electric capacity C2's common connection end link to each other, MOS pipe Q5's source ground connection, electric capacity C1 constitutes the series branch with inductance L1 and electric capacity C2 and wholly connects in parallel.
2. The blocking type parallel resonance wireless charging transmitting terminal according to claim 1, wherein the controllable buck-boost module (2) comprises a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q3, a MOS transistor Q4, an inductor L2 and a capacitor C3, the drain of the MOS transistor Q1 is connected to the output terminal of the decoupling module (1), the source of the MOS transistor Q1 is connected to the drain of the MOS transistor Q3, the source of the MOS transistor Q2 is connected to the drain of the MOS transistor Q4, one end of the inductor L2 is connected to the source of the MOS transistor Q1 and the drain of the MOS transistor Q3, and the other end is connected to the source of the MOS transistor Q2 and the drain of the MOS transistor Q4;
one end of the capacitor C3 and the source electrode of the MOS transistor Q3 and the source electrode of the MOS transistor Q4 are grounded, and the other end of the capacitor C3 and the drain electrode of the MOS transistor Q2 are used as the output end of the controllable buck-boost module (2) and connected to the input end of the parallel resonance module (3).
3. The dc blocking type parallel resonance wireless charging transmission terminal according to claim 1, wherein the decoupling capacitors are provided with 5 decoupling capacitors C4 of 470 μ F, C5 of 22 μ F, C6 of 0.02 μ F, C7 of 0.1 μ F and C8 of 10 μ F, respectively.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110696642B (en) * 2019-09-27 2023-06-30 南京理工大学 Wireless charging coupling mechanism based on inductance integrated LCC compensation topology
CN111766468B (en) * 2020-07-08 2022-08-30 重庆理工大学 Electric topology recognition system of capacitive intelligent experimental island

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000295796A (en) * 1999-04-02 2000-10-20 Tokin Corp Non-contact power supply
CN103280900A (en) * 2013-05-31 2013-09-04 苏州源辉电气有限公司 High-voltage power-taking and power-supply system based on wireless electricity transmission technology
CN104362710A (en) * 2014-10-20 2015-02-18 北京金山安全软件有限公司 Wireless charger and wireless charging system
CN106451685A (en) * 2016-12-09 2017-02-22 重庆理工大学 Mobile phone non-contact fast charge system
CN106655537A (en) * 2016-12-12 2017-05-10 重庆理工大学 Optimum efficiency tracking based self-adaptive wireless power supply system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000295796A (en) * 1999-04-02 2000-10-20 Tokin Corp Non-contact power supply
CN103280900A (en) * 2013-05-31 2013-09-04 苏州源辉电气有限公司 High-voltage power-taking and power-supply system based on wireless electricity transmission technology
CN104362710A (en) * 2014-10-20 2015-02-18 北京金山安全软件有限公司 Wireless charger and wireless charging system
CN106451685A (en) * 2016-12-09 2017-02-22 重庆理工大学 Mobile phone non-contact fast charge system
CN106655537A (en) * 2016-12-12 2017-05-10 重庆理工大学 Optimum efficiency tracking based self-adaptive wireless power supply system

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