CN201355775Y - Energy picking-up mechanism of inductive-type electric energy transmission system - Google Patents
Energy picking-up mechanism of inductive-type electric energy transmission system Download PDFInfo
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- CN201355775Y CN201355775Y CNU2008201570873U CN200820157087U CN201355775Y CN 201355775 Y CN201355775 Y CN 201355775Y CN U2008201570873 U CNU2008201570873 U CN U2008201570873U CN 200820157087 U CN200820157087 U CN 200820157087U CN 201355775 Y CN201355775 Y CN 201355775Y
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Abstract
The utility model discloses an energy picking-up mechanism of an inductive-type electric energy transmission system, consisting of a hardware circuit and a software accounting component. The hardware circuit comprises a rectification filtering module 1, a voltage releasing module 2, a switch pipe drive module 3 and a feedback control module 4; the software accounting component means that a voltage ring feedback and a current ring feedback are used to realize the accounting method of double closed loop feedback control. A voltage sensor and a current sensor are adopted to take sample for getting a sampling voltage and a sampling current; a single chip is sent into for being processed and the double closed loop feedback is adopted, so that the voltage releasing module outputs stable direct voltage and current under the control of a single chip, and a loading end outputs stable power. Verified by the experiment, the utility model is capable of outputting stable power according to the change of loading.
Description
Technical field
The utility model belongs to electric energy transmitting and transformation of electrical energy technical field, relates to a kind of inductive power transmission technology and device, especially about a kind of energy mechanism for picking of inductive power transfer system.
Background technology
Inductive electric energy transmission system, promptly IPT system (Inductive Power Transfer System) is a kind of new electric energy transmission technology, system realizes the transmission of electric energy from former limit winding to the secondary winding by high frequency magnetic field.The IPT system is a kind of energy loosely coupled system, and electric energy can be under certain frequency of operation, and the air gap by certain intervals is transferred to secondary circuit.This characteristic has solved the difficult problem that electric energy transmission system under adverse circumstances is difficult to care and maintenance.
At present, there are many scientific workers and scholar to carry out a series of research both at home and abroad at the induction electric energy transmission field, wherein the New Zealand professor J.T.Boys scientific research group development of leading power be the induction electric energy charging automobile of 1.2kW, the scholars such as Junji hirai of Japan have also developed the intelligent battery charging system that bandwidth reaches 8.5MHz.The scholar of colleges and universities such as domestic University Of Chongqing and Zhejiang University is also to induction electric energy transmission having carried out Primary Study and discussion.
But these researchs mainly lay particular emphasis on and improve system effectiveness and power density, the quality of power supply of improvement transmission and the aspects such as power capacity that improve system.In actual applications, because the variation of operating mode causes the former secondary magnetic core physical characteristic and the energy transmission path of IPT system to change through regular meeting, this just makes the power output of IPT system become unstable.More than research does not consider that this power exports unsettled situation; Therefore, above-mentioned research and achievement all are weak at stable power output facet.
Summary of the invention
The utility model has overcome some shortcomings of prior art, purpose is to provide a kind of energy mechanism for picking of inductive power transfer system, and this mechanism is a main modular with the step-down module, utilizes M68HC908 as the control core, by two close-loop feedback control, realize stable power output.
Goal of the invention of the present utility model is achieved by the following technical solution: a kind of energy mechanism for picking of inductive power transfer system, form by hardware circuit part and software algorithm; Hardware circuit comprises rectification filtering module, step-down module, switching tube driver module and feedback control module; Software algorithm then is to utilize Voltage loop feedback and electric current loop feedback, realizes the algorithm of two close-loop feedback control.
Rectification filtering module is used for the high frequency voltage of IPT system is carried out rectification, because the induced electromotive force frequency of the secondary of IPT system generally can both reach 10kHz-50kHz, such high frequency voltage is carried out rectification needs fast diode STTH2002 to build rectifier bridge.Be the output voltage and the electric current of level and smooth rectifier bridge, improve the power factor of energy mechanism for picking simultaneously, the filter circuit of behind rectifier bridge, also connecting.
The voltage of step-down module after with rectifying and wave-filtering carries out the DC-DC conversion as input voltage.Buck circuit, RCD buffer circuit, load and precision resistance have been comprised.The inductance and electric capacity and switching tube and the fly-wheel diode that comprise energy-storage travelling wave tube in the Buck circuit.The RCD buffer circuit is made up of resistance, electric capacity and diode.Precision resistance should be realized more accurate current measurement, can bear bigger high frequency current spikes again.
Feedback control module is made up of M68HC908GR32 single-chip microcomputer and peripheral circuit thereof.Obtain sampled voltage and sample rate current by voltage sensor and current sensor sampling, send into single-chip microcomputer and handle, realize two close-loop feedback control algorithms.
The switching tube driver module is the IGBT circuit of IR2110, and the HIN pin of chip and SD pin are by the control of single-chip microcomputer output signal, and wherein the HIN pin is the control signal of PWM ripple, and the input of SD pin drives enable signal, and when it was high level, the output of IR2110 was always low; When it is low level, IR2110 output PWM ripple.This output signal is directly to the step-down module
Control algolithm realizes in feedback control module.Obtain sampled voltage and sample rate current by voltage sensor and current sensor sampling, sending into single-chip microcomputer handles, adopt two close-loop feedback control, make the step-down module under the control of single-chip microcomputer, export galvanic current and press and electric current, make the stable power of load end output.Concrete steps are: at first, carry out the setting of system's initial value, comprise reference current, voltage threshold, dutyfactor value are set, and the parameter k of PI adjusting
1And k
2Then, reference current compares with the output of current sensor again, has so just obtained error current, and error current is carried out obtaining reference voltage after PI regulates.Again sampled voltage and reference voltage are compared, under the situation of both differences, reduce single-chip microcomputer and catch the value of catching in the register greater than voltage threshold, thereby the duty ratio D of PWM ripple is reduced, otherwise increase the value of catching, D is increased, get back to the stage of obtaining sample rate current I then, and this process that circulates again.Through the regular hour, system can enter stable power output state.
After adopting aforesaid technical scheme, the utlity model has following superiority:
Since the utility model from the angle design of system the realization flow of whole energy mechanism for picking, then each module in the system has been carried out the implementation procedure of parameter matching design and algorithm.Through experimental verification, the utility model can be realized stable power output according to the variation of load.
Description of drawings
Fig. 1 is a circuit structure block diagram of the present utility model;
Fig. 2 is the circuit theory diagrams of rectification filtering module of the present utility model;
Fig. 3 is the circuit theory diagrams of step-down module of the present utility model;
Fig. 4 is the circuit theory diagrams of switching tube driver module of the present utility model;
Fig. 5 is the circuit theory diagrams of feedback control module of the present utility model;
Fig. 6 is an of the present utility model pair of close-loop feedback control algorithm flow chart.
Embodiment
Below in conjunction with accompanying drawing the utility model is done detailed description.
As Fig. 1, be circuit structure block diagram of the present utility model, comprise rectification filtering module 1, step-down module 2, switching tube driver module 3 and feedback control module 4.
Rectification filtering module 1 circuit theory diagrams as shown in Figure 2, this module is used for the high frequency voltage of IPT system is carried out rectification, because the induced electromotive force frequency of the secondary of IPT system generally can both reach 10kHz-50kHz, such high frequency voltage is carried out rectification needs fast diode STTH2002 to build rectifier bridge.Be the output voltage and the electric current of level and smooth rectifier bridge, improve the power factor of energy mechanism for picking simultaneously, the filter circuit of behind rectifier bridge, also connecting.Here select a single order LC low pass filter for use, the inductance value of L is got 10mH, and C is the electrochemical capacitor of 330 μ F/250V.
The circuit theory diagrams of step-down module 2 as shown in Figure 3, the voltage of step-down module after with rectifying and wave-filtering carries out the DC-DC conversion as input voltage.Buck circuit, RCD buffer circuit, load and precision resistance have been comprised.The inductance and electric capacity and switching tube and the fly-wheel diode that comprise energy-storage travelling wave tube in the Buck circuit.The RCD buffer circuit is made up of resistance, electric capacity and diode.Precision resistance R
2For being used for the precision resistance of current sample, adopt the accurate power resistor WSL2010 of Vishay company here, its resistance is 0.01 Ω only, and power can reach 0.5W, can bear the big electric current of 7.1A.Therefore can either realize more accurate current measurement, can bear bigger high frequency current spikes again, be suitable for use as current sampling resistor.R
1Be equivalent load, the voltage at its two ends is as sampled voltage.Here use the ACS712 of Allegro to realize current sample, utilize the voltage sensor LV28-P of LEM company to realize voltage sample.When using LV28-P, need the power resistor of a 5.1k Ω/5W of series connection, as current limliting and short-circuit protection.Switching tube in the circuit is selected the IRGB20B60PD1 of IR company for use, and its switching frequency can reach 150kHz, and maximum collection emitter voltage is up to 600V, and the on-state collector current can reach 22A 100 ℃ the time.Mainly containing following parameter in the Buck circuit need determine: energy-storage travelling wave tube L
1And C
1And the peak inrush current I that passes through in the power component
MaxTheir value can be determined by empirical equation.L wherein
1Main as the control circuit operating state, need bigger value so that circuit working at CCM; C
1Be mainly used to control the ripple of output current, capacitance is big more, and ripple is more little; And definite peak inrush current I
MaxThen be switching tube and fly-wheel diode in order to choose the suitable current grade.
Because switching frequency is higher,, used by R in the circuit in order better to eliminate the current spikes that IGBT produces in switching process
3, C
2And D
0The RCD buffer circuit that constitutes, R
3, C
2Can be calculated by empirical equation, need to select suitable R C parameter, control discharges and recharges the time, cooperates the work of switching tube in the main circuit.D
0Also need select big electric current fast recovery diode for use.
Switching tube driver module 3 circuit theory diagrams are chosen the chip of the IR2110 of IR company as driving IGBT as shown in Figure 4.The HO pin of chip links to each other with the grid of IGBT by the power current-limiting resistance of one 3.3 Ω, and the VS end directly connects the emitter-base bandgap grading of IGBT.In order to realize stable driving, between the power supply of chip signal end and drive end and ground, all need to connect the bypass filter capacitor nearby, to reduce the electromagnetic interference that may occur.Owing to only need high side drive, in order to prevent mistake output, the LIN pin of chip need connect 10k Ω pull down resistor.The HIN pin of chip and SD pin are by the control of single-chip microcomputer output signal, and wherein the HIN pin is the control signal of PWM ripple, and the input of SD pin drives enable signal, and when it was high level, the output of IR2110 was always low; When it is low level, IR2110 output PWM ripple.
Feedback control module 5 circuit theory diagrams as shown in Figure 5, feedback control module 5 is made up of M68HC908GR32 single-chip microcomputer and peripheral circuit thereof.Control algolithm realizes in feedback control module.Obtain sampled voltage and sample rate current by voltage sensor and current sensor sampling, send into single-chip microcomputer and handle, realize two close-loop feedback control algorithms.
The software algorithm flow chart at first, carries out the setting of system's initial value as shown in Figure 6, comprises reference current I is set
0, voltage threshold M is set, dutyfactor value D is set, and the parameter k that PI regulates is set
1And k
1Reference current I wherein
0Obtain by source of stable pressure serial connection precision resistance, be about to reference current and be converted into behind the voltage on the precision resistance again that the output with current sensor compares, so just obtained to show as the error current E of voltage form, the value that E is carried out obtaining after PI regulates is as reference voltage V
0Again with sampled voltage V and V
0Relatively, under the situation of both differences, reduce single-chip microcomputer and catch the value of catching in the register, thereby the duty ratio D of PWM ripple is reduced, otherwise increase the value of catching, D is increased, get back to the stage of obtaining sample rate current I then greater than threshold value M, and this process that circulates again.Through the regular hour, system enters stable state.
Claims (1)
1. the energy mechanism for picking of an inductive power transfer system is made up of hardware circuit part and software algorithm; Hardware circuit comprises rectification filtering module (1), step-down module (2), switching tube driver module (3) and feedback control module (4); It is characterized in that: obtain sampled voltage and sample rate current by voltage sensor and current sensor sampling, sending into single-chip microcomputer handles, adopt two close-loop feedback control, make the step-down module under the control of single-chip microcomputer, export galvanic current and press and electric current, make the stable power of load end output.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201570873U CN201355775Y (en) | 2008-12-15 | 2008-12-15 | Energy picking-up mechanism of inductive-type electric energy transmission system |
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| CNU2008201570873U CN201355775Y (en) | 2008-12-15 | 2008-12-15 | Energy picking-up mechanism of inductive-type electric energy transmission system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101919708A (en) * | 2010-07-05 | 2010-12-22 | 深圳市开立科技有限公司 | Dual wireless ultrasonic probe and biological ultrasonic echo signal acquisition system |
| CN102130514A (en) * | 2011-03-30 | 2011-07-20 | 上海北京大学微电子研究院 | Wireless power supply device of diagnosis and treatment system |
| CN104205592A (en) * | 2012-03-19 | 2014-12-10 | 西门子公司 | DC/DC converter |
| CN107017706A (en) * | 2016-01-28 | 2017-08-04 | 联发科技股份有限公司 | Wireless charging transmitter, system and closed loop current control method |
-
2008
- 2008-12-15 CN CNU2008201570873U patent/CN201355775Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101919708A (en) * | 2010-07-05 | 2010-12-22 | 深圳市开立科技有限公司 | Dual wireless ultrasonic probe and biological ultrasonic echo signal acquisition system |
| CN102130514A (en) * | 2011-03-30 | 2011-07-20 | 上海北京大学微电子研究院 | Wireless power supply device of diagnosis and treatment system |
| CN104205592A (en) * | 2012-03-19 | 2014-12-10 | 西门子公司 | DC/DC converter |
| CN104205592B (en) * | 2012-03-19 | 2017-06-13 | 西门子公司 | DC voltage converter |
| US9735683B2 (en) | 2012-03-19 | 2017-08-15 | Siemens Aktiengesellschaft | DC/DC converter which ensures damping of voltage overshoots of a semiconductor switch |
| CN107017706A (en) * | 2016-01-28 | 2017-08-04 | 联发科技股份有限公司 | Wireless charging transmitter, system and closed loop current control method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091202 Termination date: 20101215 |