CN102647183A - Contactless power transmission (CPT) resonance frequency device based on digital signal processor (DSP) phase lock technique - Google Patents
Contactless power transmission (CPT) resonance frequency device based on digital signal processor (DSP) phase lock technique Download PDFInfo
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- CN102647183A CN102647183A CN2012101294889A CN201210129488A CN102647183A CN 102647183 A CN102647183 A CN 102647183A CN 2012101294889 A CN2012101294889 A CN 2012101294889A CN 201210129488 A CN201210129488 A CN 201210129488A CN 102647183 A CN102647183 A CN 102647183A
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Abstract
The invention discloses a CPT resonance frequency device based on a DSP phase lock technique. The CPT resonance frequency device based on the DSP phase lock technique mainly comprises a power supply unit, an LC resonance coupler and a frequency tracking unit, wherein the frequency tracking unit comprises a digital signal processor (DSP), the pulse width modulation (PWM) input end of the DSP is connected with a power amplifier connected with the LC resonance coupler, inductors and capacitors of a primary coil and a secondary coil of the LC resonance coupler are arranged symmetrically, PWM waves produced by the DSP are converted to sinusoidal waves through second order filtering, input into the power amplifier, and outputs sinusoidal signals with certain power to the LC resonance coupler. According to the CPT resonance frequency device based on the DSP phase lock technique, signal output power of the power amplifier is controlled by PWM waves produced by the DSP, phase lock is achieved by utilizing the DSP, not only hardware circuits are simplified and cost is reduced, but also problems of burn-in, temperature drift and the like of devices in analog circuits are solved, and accuracy and speed of the phase lock are improved.
Description
Technical field
The present invention relates to the resonance frequency device, be specifically related to CPT resonance frequency device based on the DSP Phase Lock Technique.
Background technology
Based on the non-contact electric energy transmission technology of magnetic field coupling is that former and deputy limit winding with coupler is respectively on different iron cores; Realized the electromagnetic energy transfer that on-mechanical connects between power supply and load; But one of shortcoming that this is technological is the poor stability to displacement and frequency; In case the off resonance state occurs, efficient can sharply descend.To realizing in the non-contact electric energy transmission field that resonance condition adopts the simulation lock to realize that mutually frequency-tracking, this patent utilize digital signal processor (DSP) to realize that through software Phase-Lock frequency-tracking reaches the resonance purpose mostly.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art; The technical problem that the present invention will solve provides the resonance frequency device based on the CPT of DSP Phase Lock Technique (non-contact electric energy transmission); Utilizing DSP to realize locking phase not only can simplify hardware circuit, reduce cost; Also solve in the analog circuit the aging and temperature of device and problem such as floated, improved the precision and the speed of lock phase.
For achieving the above object, technical scheme of the present invention is following:
CPT resonance frequency device based on the DSP Phase Lock Technique; Mainly by power subsystem; LC resonance coupler and frequency-tracking unit three parts are formed; Said frequency-tracking unit comprises digital signal processor DSP, and the PWM output of DSP connects power amplifier, and said power amplifier also is connected with LC resonance coupler.
The capturing unit CAP1 of said DSP obtains the voltage signal in the loop, former limit, and capturing unit CAP2 obtains former limit current in loop signal.
The model of said DSP is TMS320F2812.
The former limit of said LC resonance coupler and inductance, the electric capacity of secondary coil are symmetrical set.
The PWM ripple that said DSP produces is converted into sine wave through second-order filter and is input to power amplifier, exports the sinusoidal signal of certain power then and gives LC resonance coupler, and the PWM ripple that produces through DSP comes the signal output frequency of control power amplifiers.
The invention has the beneficial effects as follows:
1. to the poor stability of displacement and frequency, in case the off resonance state occurs, efficient is this problem of decline sharply during the solution non-contact electric energy transmitted.
2. adopt the tracking of realizing non-contact electric energy system resonance frequency based on the software Phase-Lock of digital signal processor TMS320F2812.
3. adopt the simulation Phase Lock Technique to realize the frequency-tracking of non-contact electric energy transmission at present mostly; Compare with the conventional analogue lock; Utilize DSP to realize that software locks not only can simplify hardware circuit mutually, reduce cost, also solved in the analog circuit the aging and temperature of device and problem such as floated, improved the precision and the speed of lock phase; Utilize this method lock have mutually the precision height, stable, be easy to advantage such as realization fast and simply; Can realize well the real-time tracking of CPT system resonance frequency has been reduced reactive loss, guarantee the high-efficiency transfer of system power.Practical application to the non-contact electric energy transmission technology has great importance.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a phase locked algorithm sketch map of the present invention.
Fig. 3 is that phase difference of the present invention is caught principle schematic
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect and be easy to understand and understand, below in conjunction with concrete diagram, further set forth the present invention.
CPT resonance frequency device based on the DSP Phase Lock Technique; Mainly by power subsystem; LC resonance coupler and frequency-tracking unit three parts are formed; Said frequency-tracking unit comprises digital signal processor DSP, and the PWM output of DSP connects power amplifier, and said power amplifier also is connected with LC resonance coupler.
The capturing unit CAP1 of said DSP obtains the voltage signal in the loop, former limit, and capturing unit CAP2 obtains former limit current in loop signal.
The model of said DSP is TMS320F2812.
The former limit of said LC resonance coupler and inductance, the electric capacity of secondary coil are symmetrical set.
The PWM ripple that said DSP produces is converted into sine wave through second-order filter and is input to power amplifier, exports the sinusoidal signal of certain power then and gives LC resonance coupler, and the PWM ripple that produces through DSP comes the signal output frequency of control power amplifiers.
Said LC resonance coupler mainly is coupled to secondary coil final powering load with the high-frequency energy that power supply produces from primary coil according to electromagnetic induction principle.Adopt inductance, the electric capacity of former limit and secondary coil to be symmetrical set among this paper, resonance takes place simultaneously to guarantee two coils.Two coils are in the self-resonance state in the LC resonance coupler, can guarantee that the reactive power in the loop is minimum, help the transmission of electric energy.
For guaranteeing that LC resonance coupler is in resonance condition all the time, can change the power supply output signal frequency through control DSP output PWM wave frequency, to guarantee voltage and electric current same-phase in the loop, former limit, realize the tracking of resonance frequency.
Operation principle of the present invention: the capturing unit through DSP is caught voltage, electric current in the loop, former limit; Calculate voltage, current and phase difference; Utilize software to advance horizontal lock again, the output frequency of adjustment PWM ripple, and then change the power supply output frequency; Make voltage, electric current homophase in the loop, former limit, finally realize the real-time tracking of coupling coil resonance frequency.
Adopt the design of the TMS320F2812 type dsp chip realization software phase-lock loop of TI company.
Mainly utilize the capturing unit of task manager EVA in the chip to catch voltage, current signal and carry out the software locks phase, the PWM ripple that utilizes timer units output to adjust frequency.Capturing unit CAP1 and CAP2 are set to the rising edge trigger mode, and the time base of general purpose timer 1 for the two is set.
The natural resonance frequency of the CPT system of this paper is made as 20kHz, and timer 1 is selected the 75MHz clock of DSP for use, and carries out 8 frequency divisions, makes that a count cycle is 0.0107 μ s.Utilize timer 2 to carry out the output of PWM ripple.
Change the phase difference of voltage, electric current in the loop, former limit through the frequency that changes PWM: if electric current leading voltage in the loop, former limit, load is capacitive in the loop, and the power supply output frequency is lower than resonance frequency, and DSP should strengthen the frequency of output PWM; If the electric current lagging voltage, load is perception in the loop, and the power supply output frequency is higher than resonance frequency, should reduce to export the frequency of PWM.
With reference to Fig. 2, can realize voltage, electric current homophase in the loop, former limit through continuous adjustment PWM driving frequency, promptly realize the tracking of resonance frequency.Specific algorithm is as shown in Figure 2:
The signal of resonance condition in (a) expression loop among Fig. 2, (b) signal of expression DSP output PWM ripple, (c) expression DSP detects voltage, current phase difference signal.
The cycle of output PWM and circuit resonance cycle, voltage, current and phase difference were zero when being all T1.When the harmonic period in the loop became T2 by T1, it was T2-T1 that DSP can detect phase difference.So the value of DSP adjustment cycle register TPR in the next cycle changes the PWM output frequency.Accomplish if be adjusted in the one-period, can cause power supply output waveform generation concuss.So select a plurality of periodic adjustment, for example select N periodic adjustment, the adjustment amount in each cycle is (T2-T1)/(N-1).The N of getting as shown in Figure 2 is 5 situation; In first cycle, detecting phase difference is T2-T1, needs to regulate to second period, makes the cycle of (b) be adjusted into T1+ (T2-T1)/4; This moment, phase difference variable was 3 (T2-T1)/4; Go to the 4th periodic phase difference according to this down and become (T2-T1)/4, phase difference is zero during to the 5th cycle, realizes that the output frequency of (b) is identical with the resonance frequency of (a).
Said with reference to Fig. 3, voltage, current and phase difference are caught principle:
The voltage and current signal becomes two capturing unit CAP1, the CAP2 that square-wave signal inserts DSP respectively through zero cross detection circuit.When CAP1 arrives at each rising edge of voltage signal, can the count value of general purpose timer 1 be write in the memory FIFO storehouse, the value counter makes zero again in interrupt routine then, for next cycle count is prepared.Just can capture when first pulse is arrived, can earlier the FIFO value be made as 1.The value N1 of the counter that captures like this can be scaled cycle of electric voltage frequency through T=N1*0.0107 μ s.When CAP2 captures current over-zero in addition; Remove to read the count value N2 of timer 1, can obtain the phase difference of voltage and current in the loop, former limit through
.If this value is less than the count value of half period, then current phase lagging voltage.Otherwise, current phase leading voltage then.
DSP is when carrying out frequency-tracking, and voltage, current phase missionary society change with the PWM wave frequency, so the phase difference that captures carries out can realizing frequency-tracking after the PI dynamic adjustments through above algorithm.
More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the specification just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection range to be defined by appending claims and equivalent thereof.
Claims (4)
1. based on the CPT resonance frequency device of DSP Phase Lock Technique; It is characterized in that; Mainly by power subsystem, LC resonance coupler and frequency-tracking unit three parts are formed, and said frequency-tracking unit comprises digital signal processor DSP; The PWM output of DSP connects power amplifier, and said power amplifier also is connected with LC resonance coupler.
2. the CPT resonance frequency device based on the DSP Phase Lock Technique according to claim 1 is characterized in that the capturing unit CAP1 of said DSP obtains the voltage signal in the loop, former limit, and capturing unit CAP2 obtains former limit current in loop signal.
3. the CPT resonance frequency device based on the DSP Phase Lock Technique according to claim 1 is characterized in that the model of said DSP is TMS320F2812.
4. the CPT resonance frequency device based on the DSP Phase Lock Technique according to claim 1 is characterized in that the former limit of said LC resonance coupler and inductance, the electric capacity of secondary coil are symmetrical set.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102832639A (en) * | 2012-08-29 | 2012-12-19 | 华南理工大学 | DSP (digital signal processor) based energy-feedback electronic load grid-connected inverting system and control method thereof |
| CN104142426A (en) * | 2013-05-09 | 2014-11-12 | 瑞奇外科器械(中国)有限公司 | Method and system for searching for resonant frequency point of transducer |
| CN110233524A (en) * | 2019-06-24 | 2019-09-13 | 天津大学 | Simulate the self-resonance controlled, super-silent wireless power supply system |
| CN110571944A (en) * | 2019-08-30 | 2019-12-13 | 中国电力科学研究院有限公司 | device and method for tracking frequency of wireless energy transmission system |
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| CN101170295A (en) * | 2007-09-25 | 2008-04-30 | 北京航空航天大学 | A flying wheel electromotor control system with magnetic suspending reaction |
| CN202163990U (en) * | 2011-07-14 | 2012-03-14 | 深圳市四方节能设备有限公司 | Feedback power-conservation optimizing control device for frequency-variable elevator |
| CN202565251U (en) * | 2012-04-27 | 2012-11-28 | 上海海事大学 | Coherent population trapping (CPT) resonance frequency device based on digital signal processor (DSP) phase lock technology |
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| JP2004048201A (en) * | 2002-07-09 | 2004-02-12 | Kddi Corp | Wireless relay method |
| CN101170295A (en) * | 2007-09-25 | 2008-04-30 | 北京航空航天大学 | A flying wheel electromotor control system with magnetic suspending reaction |
| CN202163990U (en) * | 2011-07-14 | 2012-03-14 | 深圳市四方节能设备有限公司 | Feedback power-conservation optimizing control device for frequency-variable elevator |
| CN202565251U (en) * | 2012-04-27 | 2012-11-28 | 上海海事大学 | Coherent population trapping (CPT) resonance frequency device based on digital signal processor (DSP) phase lock technology |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832639A (en) * | 2012-08-29 | 2012-12-19 | 华南理工大学 | DSP (digital signal processor) based energy-feedback electronic load grid-connected inverting system and control method thereof |
| CN102832639B (en) * | 2012-08-29 | 2014-07-30 | 华南理工大学 | DSP (digital signal processor) based energy-feedback electronic load grid-connected inverting system and control method thereof |
| CN104142426A (en) * | 2013-05-09 | 2014-11-12 | 瑞奇外科器械(中国)有限公司 | Method and system for searching for resonant frequency point of transducer |
| US10006804B2 (en) | 2013-05-09 | 2018-06-26 | Reach Surgical Inc. | Method and system for searching for resonant frequency of transducer |
| CN110233524A (en) * | 2019-06-24 | 2019-09-13 | 天津大学 | Simulate the self-resonance controlled, super-silent wireless power supply system |
| CN110233524B (en) * | 2019-06-24 | 2023-09-26 | 天津大学 | Analog controlled self-resonance and ultra-silent wireless power supply system |
| CN110571944A (en) * | 2019-08-30 | 2019-12-13 | 中国电力科学研究院有限公司 | device and method for tracking frequency of wireless energy transmission system |
| CN110571944B (en) * | 2019-08-30 | 2022-07-01 | 中国电力科学研究院有限公司 | Device and method for tracking frequency of wireless energy transmission system |
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Application publication date: 20120822 |