CN204131237U - The frequency tracking apparatus of wireless energy transfer system - Google Patents
The frequency tracking apparatus of wireless energy transfer system Download PDFInfo
- Publication number
- CN204131237U CN204131237U CN201420569752.5U CN201420569752U CN204131237U CN 204131237 U CN204131237 U CN 204131237U CN 201420569752 U CN201420569752 U CN 201420569752U CN 204131237 U CN204131237 U CN 204131237U
- Authority
- CN
- China
- Prior art keywords
- circuit
- frequency
- energy transfer
- chip
- wireless energy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The utility model relates to a kind of frequency tracking apparatus of wireless energy transfer system, comprising: comprising: full bridge inverter drive circuit, DDS chip, single-chip microcomputer, phase difference detecting circuit, armature winding loop, voltage sampling circuit, current sampling circuit and amplification and rectification circuit.The invention also discloses a kind of frequency tracking method being applied to the frequency tracking apparatus of wireless energy transfer system, comprise the following steps: 1, the result of frequency-tracking is reflected into frequency data and imports DDS chip into by single-chip microcomputer; 2, the controlled quentity controlled variable that phase detecting circuit exports only remains unchanged when off resonance state or resonance condition; 3, upgrade in time the frequency control word of DDS chip of single-chip microcomputer produces new operating frequency to drive inverter circuit, and phase detecting circuit cycle detection judges simultaneously, until System recover resonance.The utility model has that structure is simple and efficient solves the advantages such as the problem of wireless energy transfer system medium frequency off resonance.
Description
Technical field
The utility model relates to a kind of in monolithic processor controlled technology of frequency tracking, particularly a kind of frequency tracking apparatus of wireless energy transfer system.
Background technology
At present, open loop wireless energy transfer system is in the course of the work due to reasons such as the error of circuit operating temperature change, parasitic parameter change, capacitor and inductor making and the people of diagnosis different building shape, the natural resonance frequency of system primary and secondary wire loop is caused to change and deviate from the operating frequency of systemic presupposition, cause system generation off resonance phenomenon, electric current in wire loop is reduced, the alternating electromagnetism field intensity produced also has decreased, and then cause system capacity efficiency of transmission to reduce, micro-diagnostic and examination system cannot normally be worked.What current technology of frequency tracking utilization was maximum is phase-locked loop tracking circuit, but this system is comparatively large by electromagnetic interference influence, and when system is series resonance, tracking frequency easily causes deadlock situation, must could recover normal work by extraneous interfering system.
Utility model content
Primary and foremost purpose of the present utility model is that the shortcoming overcoming prior art is with not enough, a kind of frequency tracking apparatus of wireless energy transfer system is provided, this frequency tracking apparatus solves the problem of primary emission wire loop off resonance, make armature winding loop work in the state of resonance all the time, ensure that wireless energy transfer system is in the state of resonance all the time.
Another object of the present utility model is that the shortcoming overcoming prior art is with not enough, a kind of frequency tracking method being applied to the frequency tracking apparatus of wireless energy transfer system is provided, the phenomenon of the energy transferring instability that the off resonance that this frequency tracking method efficiently solves wireless energy transfer system appearance brings is stable to ensure that system capacity exports.
Primary and foremost purpose of the present utility model is achieved through the following technical solutions: a kind of frequency tracking apparatus of wireless energy transfer system, comprise: full bridge inverter drive circuit, DDS chip, single-chip microcomputer, phase difference detecting circuit, armature winding loop, voltage sampling circuit, current sampling circuit and amplification and rectification circuit, described full bridge inverter drive circuit comprises high-frequency inverter circuit and PWM drive circuit;
Described armature winding loop, high-frequency inverter circuit, PWM drive circuit, DDS chip, single-chip microcomputer are connected successively with phase difference detecting circuit, the input of described voltage sampling circuit is all connected with armature winding loop with the input of current sampling circuit, and the output of described voltage sampling circuit is all connected with phase difference detecting circuit by amplification and rectification circuit with the output of current sampling circuit;
Described current sampling circuit is for gathering the current signal in armature winding loop; Described voltage sampling circuit is for gathering the voltage signal in armature winding loop; The electric current collected and voltage signal are carried out amplification to described amplification and rectification circuit respectively and Shape correction is square-wave signal, then exports the input coating-forming voltage current phase difference signal of phase difference detecting circuit to; The input of described voltage current phase difference signal input single-chip microcomputer, described single-chip microcomputer is used for carrying out frequency tracing control to wireless energy transfer system, and drives DDS chip to produce the pwm signal input PWM drive circuit of certain frequency; Described PWM drive circuit drives high-frequency inverter circuit as the power supply in armature winding loop.
The control method that described single-chip microcomputer is used for carrying out wireless energy transfer system frequency tracing control is: the voltage signal in armature winding loop and current signal are carried out phase compare, utilize the phase relation in phase difference detecting circuit determination armature winding loop, and using described phase relation as control signal, described single-chip microcomputer carries out frequency-tracking by control signal to wireless energy transfer system, make wireless energy transfer system keep resonance condition, solve the off resonance problem of wireless energy transfer system.
Single-chip microcomputer by control signal to the tracking that wireless energy transfer system carries out frequency-tracking is: described Single-chip Controlling DDS chip produces the pwm signal of certain frequency; Check processing is carried out to the voltage current phase difference signal gathered simultaneously, and by the result feedback of frequency-tracking to wireless energy transfer system, keep the resonance condition of wireless energy transfer system under new frequency.
The high-power MOSFET special drive integrated circult IR2110 chip driving described PWM drive circuit and drive high-frequency inverter circuit all to adopt American I R company to produce, this high-power MOSFET special drive integrated circult IR2110 chip has bootstrapping suspension driving power and can export two-way drive singal simultaneously and drive upper and lower two switching tubes on same brachium pontis, described drive integrated circult IR2110 chip comprises: the first bootstrap capacitor C11, the second bootstrap capacitor C12, bootstrap diode E, the first filter capacitor C21, the second filter capacitor C22, a MOSFET pipe M1, the 2nd MOSFET pipe M2, the first resistance R1 and the second resistance R2, suppose that a MOSFET pipe M1 has been charged to enough voltage VC1 at blocking interval first filter capacitor C21 and the second filter capacitor C22, when HIN is high level, the switching tube VM1 that IR2110 chip internal is integrated on same brachium pontis is open-minded, VM2 turns off, VC1 passes through grid and the source electrode of VM1, second resistance R2 forms loop electric discharge, at this moment the first filter capacitor C21 and the second filter capacitor C22 is equivalent to a voltage source and makes a MOSFET pipe M1 conducting, LIN is low level simultaneously, the switching tube VM4 that IR2110 chip internal is integrated on same brachium pontis is open-minded, VM3 turns off, at this moment the electric charge of the 2nd MOSFET pipe M2 grid and source electrode is gathered in by the second resistance R2, VM4 discharges rapidly over the ground, because Dead Time impact makes the 2nd MOSFET pipe M2 turn off rapidly before a MOSFET pipe M1 opens, when HIN is low level, VM1 turns off, and VM2 is open-minded, and the electric charge being at this moment gathered in a MOSFET pipe M1 grid and source electrode is discharged rapidly by the first resistance R1, be high level through of short duration Dead Time LIN, VM4 turns off, VM3 conducting, makes VCC through the first resistance R1, and the grid of the 2nd MOSFET pipe M2 and source electrode form loop, make the 2nd MOSFET pipe M2 open-minded, meanwhile, VCC is through bootstrap diode E, and the first bootstrap capacitor C11, the second bootstrap capacitor C12 and the 2nd MOSFET pipe M2 form loop, charge to the first bootstrap capacitor C11, the second bootstrap capacitor C12, circulation like this is gone down repeatedly.
Another object of the present utility model is achieved through the following technical solutions: a kind of frequency tracking method being applied to the frequency tracking apparatus of wireless energy transfer system, comprises the following steps:
Step 1, in frequency follow-up system wireless energy transfer system, Single-chip Controlling DDS chip produces the pwm signal of certain frequency in order to drive inverter bridge and to carry out judgement process to the voltage current phase difference signal gathered, the operating frequency of guarantee system follows the tracks of the change of the natural resonance frequency in armature winding loop, the result of frequency-tracking is reflected into frequency data import in DDS chip, make system at new operation at frequencies;
The controlled quentity controlled variable that step 2, phase detecting circuit export remains unchanged when off resonance state or resonance condition, and when there is the State Transferring of off resonance state and resonance condition, the controlled quentity controlled variable that phase detecting circuit exports changes; Such as when voltage-phase leading current, controlled quentity controlled variable is " 0 ", and now system operating frequency needs to reduce and could recover resonance;
The built-in program of step 3, single-chip microcomputer constantly goes to reduce system operating frequency with certain step-length, and the frequency control word of the DDS chip that upgrades in time produces new operating frequency to drive inverter circuit at every turn, phase detecting circuit carries out phase-detection to the voltage current phase in launching circuit under at every turn new operating frequency simultaneously, export new controlled quentity controlled variable and send into single-chip processor i/o mouth, continuous cycle detection judges, until voltage is identical with current phase or close to time identical, controlled quentity controlled variable becomes " 1 ", operating frequency no longer reduces, till System recover resonance; When voltage-phase lagging current phase place, the like, the control procedure under two states checks and balance impact, and common maintenance system is in the state of resonance.Frequency tracing control program circuit as shown in Figure 6.
The model of described DDS chip can be AD9850.
Principle of the present utility model: the off resonance that the change due to the natural resonance frequency in armature winding loop causes is the principal element causing wireless energy transfer system efficiency to reduce, therefore the utility model mainly utilizes the resonance problems of frequency-tracking system enhancement primary emission wire loop, that is: make it be in resonance condition all the time for primary emission wire loop design frequency tracking circuit.Flow sensor gathers the current information in armature winding loop, obtains being proportional to electric current I in transmitting coil
tvoltage signal V
i, be shaped as square-wave signal V through hysteresis comparator
q1, the voltage U at two ends, armature winding loop is gathered with voltage sensor
t, be shaped as square-wave signal V through hysteresis comparator
q2.Then these two square-wave signals are delivered to phase difference detecting circuit simultaneously draw phase information.Make single-chip microcomputer make corresponding reaction according to the voltage current phase difference information in loop to go control DDS chip to change the frequency of the pwm signal exported, go to drive high-frequency inverter circuit work through PWM drive circuit with new operating frequency.
The utility model has following advantage and effect relative to prior art:
1, the utility model utilizes single-chip microcomputer to replace phase-locked loop tracking circuit to solve the frequency detuning problem of wireless energy transfer system, maintains the stability of system capacity transmission.
2, the utility model adopts DDS chip AD9850 to have highly sensitive as the control chip of power inverter, and frequency accuracy is high, and signal frequency converting is feature rapidly.
3, frequency tracking circuit of the present utility model is simple and practical, and can regulate tracking sensitivity by program, can be suitable for different occasions.
4, circuit in kind of the present utility model adopts keyboard input signal frequency, initial operating frequency can be changed according to different application occasions, pumping signal can be provided for multiple different transmitting coil, and ensure that primary coil is all in resonance condition, maintain the maximized state of system capacity efficiency of transmission.
Accompanying drawing explanation
Fig. 1 is based on monolithic processor controlled wireless energy transfer system frequency tracking apparatus structure principle chart.
Fig. 2 is current sampling circuit figure; Wherein, U
out=I
2r
l.
Fig. 3 is voltage sampling circuit figure; Wherein, U
out=I
2r
l.
Fig. 4 is phase difference detecting circuit figure.
Fig. 5 is full bridge inverter drive circuit figure.
Fig. 6 is the control program flow chart of frequency follow-up system wireless energy transfer system.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment
As shown in Figure 1, a kind of frequency tracking apparatus of wireless energy transfer system, comprise: full bridge inverter drive circuit, DDS chip, single-chip microcomputer, phase difference detecting circuit, armature winding loop, voltage sampling circuit, current sampling circuit and amplification and rectification circuit, described full bridge inverter drive circuit comprises high-frequency inverter circuit and PWM drive circuit
The control of frequency-tracking is completed by single-chip microcomputer, and single-chip microcomputer on the one hand control DDS chip (model of described DDS chip is AD9850) produces the pwm signal input PWM drive circuit of certain frequency in order to drive high-frequency inverter circuit; To being carried out judgement process by the voltage current phase difference signal gathered, to ensure that the operating frequency of system follows the tracks of the change of the natural resonance frequency in armature winding loop on the other hand.
Full bridge inverter drive circuit figure as shown in Figure 5, shown full bridge inverter drive circuit comprises high-frequency inverter circuit and PWM drive circuit, because the pwm signal amplitude that AD9850 produces only has about 5V, do not reach the requirement of driving switch pipe MOSFET, here adopt PWM drive circuit that signal amplitude is risen to about 12V, reach the driving requirement of MOSFET pipe, then under the driven of pwm signal low and high level, full bridge inverter is positioned at the MOSFET pipe conducting simultaneously on diagonal and cut-off, and MOSFET pipe alternate conduction on two groups of diagonal and cut-off, realize loop current phugoid oscillation.
PWM drive circuit, driving high-frequency inverter circuit, the two has organically combined the driving to high-frequency inverter circuit, what driving chip adopted is the high-power MOSFET special drive integrated circult IR2110 chip that American I R company produces, and it has bootstrapping suspension driving power and can export two-way drive singal simultaneously and drive upper and lower two switching tubes on same brachium pontis.Concrete a slice IR2110 chip boot suspension driving process is as follows: full bridge inverter drive circuit as shown in Figure 5, comprise the first bootstrap capacitor C11, the second bootstrap capacitor C12, bootstrap diode E, the first filter capacitor C21, the second filter capacitor C22, a MOSFET pipe M1, the 2nd MOSFET pipe M2, the first resistance R1 and the second resistance R2.Supposing that a MOSFET pipe M1 has been charged to enough voltage at blocking interval first filter capacitor C21 and the second filter capacitor C22 is VC1.When HIN is high level, the switching tube VM1 that IR2110 chip internal is integrated on same brachium pontis is open-minded, VM2 turns off, VC1 passes through grid and the source electrode of VM1, second resistance R2 forms loop electric discharge, at this moment the first filter capacitor C21 and the second filter capacitor C22 is equivalent to a voltage source and makes a MOSFET pipe M1 conducting, LIN is low level simultaneously, the switching tube VM4 that IR2110 chip internal is integrated on same brachium pontis is open-minded, VM3 turns off, at this moment the electric charge of the 2nd MOSFET pipe M2 grid and source electrode is gathered in by the second resistance R2, VM4 discharges rapidly over the ground, because Dead Time impact makes the 2nd MOSFET pipe M2 turn off rapidly before a MOSFET pipe M1 opens, when HIN is low level, VM1 turns off, and VM2 is open-minded, and the electric charge being at this moment gathered in a MOSFET pipe M1 grid and source electrode is discharged rapidly by the first resistance R1.Be high level through of short duration Dead Time LIN, VM4 turns off, VM3 conducting, makes VCC through the first resistance R1, and the grid of the 2nd MOSFET pipe M2 and source electrode form loop, make the 2nd MOSFET pipe M2 open-minded, meanwhile, VCC is through bootstrap diode E, and the first bootstrap capacitor C11, the second bootstrap capacitor C12 and the 2nd MOSFET pipe M2 form loop, charge to the first bootstrap capacitor C11, the second bootstrap capacitor C12, circulation like this is gone down repeatedly.
Current sampling circuit adopts HF current transformer, and the magnetic core of current transformer need possess good high frequency performance, and circuit as shown in Figure 2.
Voltage sampling circuit adopts high frequency voltage instrument transformer, and the magnetic core of voltage transformer needs to adopt high frequency performance good, and be not easy saturated and that remanent magnetism is little magnetic material simultaneously and make, circuit as shown in Figure 3.
The voltage signal in the armature winding loop gathered by high frequency voltage instrument transformer exports as sine wave signal, and the current signal in the armature winding loop gathered by HF current transformer exports as sinusoidal ac signal, need to be transformed into square-wave signal through shaping circuit, therefore by amplification and rectification circuit respectively to voltage sample output signal and current sample output signal process, as input signal.Amplification and rectification circuit adopts hysteresis comparator, and circuit as shown in Figure 4.
Phase difference detecting circuit is realized by d type flip flop, and concrete circuit as shown in Figure 4.Voltage after shaping, current square-wave signal input clock signal terminal and the input of d type flip flop respectively, can judge the phase relation between voltage signal and current signal according to the output end signal of d type flip flop.
As shown in Figure 6, the frequency tracking method being applied to the frequency tracking apparatus of wireless energy transfer system is: in frequency follow-up system wireless energy transfer system, and single-chip microcomputer on the one hand control AD9850 produces the pwm signal of certain frequency in order to drive inverter bridge; Judgement process to be carried out on the other hand to the voltage current phase difference signal gathered, the operating frequency of guarantee system follows the tracks of the change of the natural resonance frequency in armature winding loop, the result of frequency-tracking is reflected into frequency data to be imported in AD9850, makes system at new operation at frequencies.The controlled quentity controlled variable that phase detecting circuit exports remains unchanged when off resonance or resonance condition, when changing under two states, its controlled quentity controlled variable just changes, such as when voltage-phase leading current, controlled quentity controlled variable is " 0 ", now system operating frequency needs to reduce and could recover resonance, program in single-chip microcomputer constantly goes to reduce system operating frequency with certain step-length, and the frequency control word of the AD9850 that upgrades in time produces new operating frequency to drive inverter circuit at every turn, phase detecting circuit carries out phase-detection to the voltage current phase in launching circuit under at every turn new operating frequency simultaneously, export new controlled quentity controlled variable and send into single-chip processor i/o mouth, so constantly cycle detection judges, until voltage is identical with current phase or close to time identical, controlled quentity controlled variable becomes " 1 ", operating frequency no longer reduces, System recover resonance.When voltage-phase lagging current phase place, the like.The control procedure of the frequency-tracking under two kinds of states checks and balance impact, and common maintenance system is in the state of resonance.
Above-described embodiment is the utility model preferably execution mode; but execution mode of the present utility model is not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present utility model and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection range of the present utility model.
Claims (3)
1. the frequency tracking apparatus of a wireless energy transfer system, it is characterized in that, comprise: full bridge inverter drive circuit, DDS chip, single-chip microcomputer, phase difference detecting circuit, armature winding loop, voltage sampling circuit, current sampling circuit and amplification and rectification circuit, described full bridge inverter drive circuit comprises high-frequency inverter circuit and PWM drive circuit;
Described armature winding loop, high-frequency inverter circuit, PWM drive circuit, DDS chip, single-chip microcomputer are connected successively with phase difference detecting circuit, the input of described voltage sampling circuit is all connected with armature winding loop with the input of current sampling circuit, and the output of described voltage sampling circuit is all connected with phase difference detecting circuit by amplification and rectification circuit with the output of current sampling circuit.
2. the frequency tracking apparatus of wireless energy transfer system according to claim 1, is characterized in that, drives described PWM drive circuit and drives high-frequency inverter circuit all to adopt drive integrated circult IR2110 chip; Described drive integrated circult IR2110 chip comprises: the first bootstrap capacitor (C11), the second bootstrap capacitor (C12), bootstrap diode (E), the first filter capacitor (C21), the second filter capacitor (C22), MOSFET pipe (M1), the 2nd MOSFET pipe (M2), the first resistance (R1) and the second resistance (R2).
3. the frequency tracking apparatus of wireless energy transfer system according to claim 1, is characterized in that, in step 1, the model of described DDS chip is AD9850.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420569752.5U CN204131237U (en) | 2014-09-29 | 2014-09-29 | The frequency tracking apparatus of wireless energy transfer system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420569752.5U CN204131237U (en) | 2014-09-29 | 2014-09-29 | The frequency tracking apparatus of wireless energy transfer system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204131237U true CN204131237U (en) | 2015-01-28 |
Family
ID=52387558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420569752.5U Expired - Fee Related CN204131237U (en) | 2014-09-29 | 2014-09-29 | The frequency tracking apparatus of wireless energy transfer system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204131237U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106891763A (en) * | 2017-02-27 | 2017-06-27 | 中国石油大学(华东) | Wireless charging system for electric automobile frequency tracking method |
-
2014
- 2014-09-29 CN CN201420569752.5U patent/CN204131237U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106891763A (en) * | 2017-02-27 | 2017-06-27 | 中国石油大学(华东) | Wireless charging system for electric automobile frequency tracking method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104269943A (en) | Frequency tracking device of wireless energy transmitting system and frequency tracking method thereof | |
| CN103051198B (en) | Staggered parallel flyback driving power supply | |
| CN103580000A (en) | Overvoltage protection method and circuit for switching power supply output and switching power supply provided with the circuit | |
| CN104113098A (en) | Wireless charging topological structure and frequency sweep algorithm | |
| CN107689691A (en) | A kind of magnetic resonance type wireless charging sensor network nodes design method | |
| CN207114622U (en) | A kind of list fiery line detection circuit, control circuit and switch | |
| CN203119584U (en) | Wireless charging device for low-power electric device | |
| CN108656994A (en) | A kind of electric vehicle IPT systems of variable capacitance | |
| CN204228811U (en) | A kind of zero cross detection circuit | |
| CN203352842U (en) | Induction heating equipment with frequency tracking circuit | |
| CN103412181A (en) | Inductance and current zero-cross detection circuit for correcting boost type power factor | |
| CN104135163A (en) | Rotary ultrasonic machining driver based on BUCK circuit | |
| CN104242658B (en) | Valley-switching digital control circuit of switch power source | |
| CN105958661A (en) | Efficient E class resonant type magnetic coupling wireless energy transmission system | |
| CN204131237U (en) | The frequency tracking apparatus of wireless energy transfer system | |
| CN102570839A (en) | LLC (inductor-inductor-capacitance) resonant DC-DC (Direct Current-Direct Current) power supply capable of changing resonance frequency by changing capacitance | |
| CN107102368B (en) | A kind of closed-loop control near-earth water source exploration device and detection method | |
| CN103825471A (en) | Frequency-variable power source for driving small or medium-sized magnetostrictive transducer | |
| CN102158089B (en) | Power inverter and reactive absorption circuit of contravariant soft switching electric welder | |
| CN102497104B (en) | Resonant transformation circuit applied to medical equipment and provided with synchronous rectification control | |
| CN107015513A (en) | Control circuit, household appliance and power supply method of household appliance | |
| CN104022672A (en) | Self-adaptive adjustable delay circuit for soft-switch ZVT (zero voltage transformation) converter | |
| CN204134714U (en) | non-contact ultrasonic cracking system | |
| CN106685225B (en) | A kind of control method and device of booster circuit | |
| CN208337436U (en) | A kind of fractional order D class parallel resonance device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150128 Termination date: 20170929 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |