CN110289693A - A kind of wireless energy transfer system and its control method - Google Patents
A kind of wireless energy transfer system and its control method Download PDFInfo
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Classifications
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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
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Abstract
The present invention relates to a kind of wireless energy transfer system and its control method, the system comprises: DC power supply, H bridge inverter, the first compensating electric capacity, the second compensating electric capacity, send can coil, rectifier bridge, DC/DC converter and energy-storage units；The DC power supply accesses the DC side of the H bridge inverter, and the exchange side of H bridge inverter is connect by first compensating electric capacity with the primary coil for sending energy coil；The secondary coil for sending energy coil is connected by second compensating electric capacity with the side that exchanges of rectifier bridge；The DC side of the rectifier bridge is connect with the input terminal of DC/DC converter；The output end of the DC/DC converter is connected to energy-storage units and load respectively.Technical solution provided by the invention improves the class of insulation of wireless energy transfer system, reduces the volt-ampere grade of wireless energy transfer system, is suitable for high pressure applications, ensure that the maximization of wireless energy transfer system efficiency.
Description
Technical field
The present invention relates to wireless power transmission technical fields, and in particular to a kind of wireless energy transfer system and its controlling party
Method.
Background technique
In flexible AC transmitting system, voltage class is usually very high, this is to electronic power switch component driving circuit
The class of insulation proposes very high requirement, to ensure safety property.In general, it is that these driving circuits mention that isolating transformer, which can be used,
For the power supply of isolation.But isolating transformer is excessively heavy, and increases cost and installation difficulty.Wirelessly sending can technology
Energy is transmitted between the circuit that can directly do not contact at two, enough skies can be passed through using wireless energy transfer system
Air bound is from the higher class of insulation of acquisition.Therefore, energy technology is wirelessly sent to be very suitable for as power electronics in high pressure applications
The driving circuit of switching device provides energy.
Current wireless energy transfer system, since distance is larger between coil, coil is by magnetic field with the shape of weak coupling
Formula interacts, therefore coil leakage inductance is larger, so that can generate very big idle in electric energy transmission process, reduces the volt of system
Pacify grade.In addition the impedance operator of wireless energy transfer system itself cannot often be matched to maximal efficiency click-through with load impedance
Row work affects fan-out capability of the energy from power supply side to load-side.
Summary of the invention
In view of the deficiencies of the prior art, the object of the present invention is to provide a kind of wireless energy transfer system and its controlling parties
Case improves the class of insulation of wireless energy transfer system, is suitable for high pressure applications, ensure that wireless energy transfer system
The maximization of efficiency.
The purpose of the present invention is adopt the following technical solutions realization:
A kind of wireless energy transfer system, it is improved in that the system comprises: DC power supply, H bridge inverter,
First compensating electric capacity, the second compensating electric capacity send energy coil, rectifier bridge, DC/DC converter and energy-storage units；
The DC power supply accesses the DC side of the H bridge inverter, and the exchange side of H bridge inverter is mended by described first
Capacitor is repaid to connect with the primary coil for sending energy coil；
The secondary coil for sending energy coil is connected by second compensating electric capacity with the side that exchanges of rectifier bridge；
The DC side of the rectifier bridge is connect with the input terminal of DC/DC converter；
The output end of the DC/DC converter is connected to energy-storage units and load respectively.
Preferably, the H bridge inverter is made of two bridge arms in parallel, wherein bridge arm by two be serially connected open
Close device composition.
Further, the switching device is made of semiconductor switch pipe and diode reverse parallel connection.
Preferably, the rectifier bridge is made of two bridge arms in parallel, wherein the diode that bridge arm is serially connected by two
Composition.
A kind of control method of wireless energy transfer system, it is improved in that the described method includes:
The supply voltage that the H bridge inverter provides DC power supply is converted to alternating voltage；
The exchange side for sending energy coil that the alternating voltage is sent to the rectifier bridge；
Received alternating voltage is converted to the DC voltage for being used for powering load by the rectifier bridge, and is used for described
The DC voltage of powering load is sent to the input terminal of the DC/DC converter；
The DC/DC converter utilizes the received DC voltage for powering load to load supplying or control energy storage
Unit charge and discharge.
Preferably, the DC/DC converter utilize the received DC voltage for powering load to load supplying or
Control energy-storage units charge and discharge, comprising:
According to the duty ratio for the equivalent load resistance adjusting DC/DC converter for sending secondary coil in energy coil；
Duty ratio using DC/DC converter and the DC voltage for powering load determine the defeated of DC/DC converter
DC voltage out；
Using the output DC voltage of the DC/DC converter to load supplying or control energy-storage units charge and discharge.
Further, the basis send the equivalent load resistance of secondary coil in energy coil to adjust accounting for for DC/DC converter
Empty ratio, comprising:
The duty ratio D of DC/DC converter is adjusted as the following formula:
In above formula, RLeqFor the equivalent load resistance for sending secondary side in energy coil, V ' is the output of preset DC/DC converter
DC voltage, IsampFor the amplitude for sending secondary current in energy coil, D is the duty ratio of DC/DC converter.
Specifically, determining the equivalent load resistance R for sending secondary side in energy coil as the following formulaLeq:
In above formula, k is the coefficient of coup that send can between coil Central Plains sideline circle and secondary coil, RsIt is secondary in energy coil to send
The resistance of sideline circle, QpFor the quality factor for sending energy coil Central Plains sideline circle, QsFor send can in coil secondary coil quality because
Number.
Further, the duty ratio for utilizing the DC/DC converter after adjusting and the direct current for powering load
Pressure obtains the output DC voltage of DC/DC converter, comprising:
The output DC voltage V of DC/DC converter is determined as the following formulao,b:
In above formula, Vi,bFor the DC voltage for powering load.
Further, the output DC voltage control energy-storage units charge and discharge using the DC/DC converter, packet
It includes:
When the corresponding transimission power of output DC voltage of the DC/DC converter is greater than bearing power, the energy storage
Unit charges；
When the corresponding transimission power of output DC voltage of the DC/DC converter is less than bearing power, the energy storage
Unit discharges；
When the corresponding transimission power of output DC voltage of the DC/DC converter is equal to bearing power, the energy storage
Unit, which does not charge, also not to discharge.
Compared with the immediate prior art, the invention has the benefit that
Technical solution provided by the invention passes through DC power supply, H bridge inverter, the first compensating electric capacity, the second compensation electricity
A kind of wireless energy transfer system for holding, sending energy coil, rectifier bridge, DC/DC converter and energy-storage units building, improves wireless
The class of insulation of energy transmission system reduces the volt-ampere grade of wireless energy transfer system, is suitable for high pressure applications, protects
The maximization of wireless energy transfer system efficiency is demonstrate,proved.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of wireless energy transfer system in the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of DC/DC converter in wireless energy transfer system in the embodiment of the present invention；
Fig. 3 is a kind of flow diagram of the control method of wireless energy transfer system in the embodiment of the present invention.
Specific embodiment
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention provides a kind of wireless energy transfer systems, comprising:
DC power supply, the first compensating electric capacity, the second compensating electric capacity, send energy coil, rectifier bridge, DC/DC to become at H bridge inverter
Parallel operation and energy-storage units；
The DC power supply accesses the DC side of the H bridge inverter, and the exchange side of H bridge inverter is mended by described first
Capacitor is repaid to connect with the primary coil for sending energy coil；
The secondary coil for sending energy coil is connected by second compensating electric capacity with the side that exchanges of rectifier bridge；
The DC side of the rectifier bridge is connect with the input terminal of DC/DC converter；
The output end of the DC/DC converter is connected to energy-storage units and load respectively.
In embodiment provided by the invention, as shown in Figure 1, giving is driving circuit designed by technical solution of the present invention
The wireless energy transfer system structure chart of power supply is provided.Primary coil and secondary coil in system constitute a loose coupling and become
Depressor.Four MOSFET (S1, S2, S3And S4) a H bridge inverter is constituted, the alternating voltage of high frequency is provided for primary coil
Source.Primary and secondary side coil uses compensating electric capacity to constitute series connection-series compensation circuit therewith respectively.The output of secondary coil is connected to
On the uncontrollable rectifier bridge be made of four diodes, the exchange output that secondary side exports is converted into DC power supply.It is exported in rectification
There is a DC/DC current transformer between energy storage units, there are two effects for it: first effect is for controlling inflow energy storage
The energy size of unit；Second effect is can to adjust the size of equivalent load by control duty ratio to match wireless energy
Transmission system enables and obtains optimal efficiency always in actual loading changed power.
Wherein, the load is the active component, including circuit board, communication device and driving circuit etc. of any consumption.
For another example the structural schematic diagram of DC/DC converter as shown in Figure 2, the DC/DC converter in Fig. 2 uses Boost
The mode of circuit is realized.Wherein, Vi,bIt is the input direct-current voltage of DC/DC converter, Vi,bEqual to rectifier bridge offer to negative
Carry the DC voltage of power supply, Vi,bIt is also equal to capacitor C0On voltage；RLeqFor send can in coil secondary side equivalent load resistance,
Vo,bIt is the output DC voltage of DC/DC converter, LbFor inductance, DbFor diode, KbFor switch, Ii,bIt is capacitor CoCharging
Electric current is rectified to obtain by prime coil system by diode rectifier bridge.Assuming that the duty ratio of Boost circuit is D, then Vi,b
And Vo,bThere is relationship shown in following formula:
Vi,b=(1-D) Vo,b
If not considering the loss of Boost circuit, the charge power of energy storage units and the input work of Boost circuit
Rate Pin,bIt is equal, it can be calculated with following formula:
In above formula, T is the electric current I for sending secondary coil in energy coilsPeriod.Due to IsWith constant amplitude, Ii,b?
Average value in cycle T is also constant.Therefore, the charge power P of Boost circuitin,bIt can be by adjusting accounting for for Boost circuit
Sky ratio D is controlled；
Under normal conditions, in different operating conditions, the load of electronic power switch driving current is time-varying, therefore cannot be begun
Guarantee that system obtains optimal load resistance required for maximal efficiency eventually.In order to solve this problem, so that system can obtain always
Maximal efficiency is obtained, DC/DC converter can adjust the equivalent load resistance R on secondary side by duty ratio DLeq, specific mathematic(al) representation
It is as follows:
In formula, IsampFor the amplitude for sending secondary current in energy coil；
Further, the H bridge inverter is made of two bridge arms in parallel, wherein what bridge arm was serially connected by two
Switching device composition.
Specifically, the switching device is made of semiconductor switch pipe and diode reverse parallel connection.
Further, the rectifier bridge is made of two bridge arms in parallel, wherein two poles that bridge arm is serially connected by two
Pipe composition.
A kind of wireless energy transfer system provided by the invention avoids original by using the form of wireless energy transfer
Direct contact while with secondary, improves the class of insulation of energy transmission system, is suitable for high pressure applications；By using
DC/DC converter dynamic regulation send the size of the equivalent load resistance on secondary side in energy coil, it is ensured that the maximum of system effectiveness
Change；The larger leakage inductance as caused by the loose coupling between primary and secondary side coil, by by compensating electric capacity respectively with primary side and pair
Sideline circle series connection can filter out energy and send the perceptual weight generated when energy coil transmission, reduce the volt-ampere grade of system；?
In high-voltage flexible AC transmission system, the energy for dynamically distributing each load is most important, is become by the DC/DC that this patent designs
Parallel operation, the energy that each load obtains can be adjusted neatly.
The present invention also provides a kind of control methods of wireless energy transfer system, as shown in Figure 3, which comprises
101. the supply voltage that the H bridge inverter provides DC power supply is converted to alternating voltage；
The exchange side for sending energy coil that the alternating voltage is sent to the rectifier bridge described in 102.；
103. received alternating voltage is converted to the DC voltage for being used for powering load by the rectifier bridge, and will be described
DC voltage for powering load is sent to the input terminal of the DC/DC converter；
104. the DC/DC converter utilizes the received DC voltage for powering load to load supplying or control
Energy-storage units charge and discharge.
Further, the step 104, comprising:
According to the duty ratio for the equivalent load resistance adjusting DC/DC converter for sending secondary coil in energy coil；
Duty ratio using DC/DC converter and the DC voltage for powering load determine the defeated of DC/DC converter
DC voltage out；
Using the output DC voltage of the DC/DC converter to load supplying or control energy-storage units charge and discharge.
Specifically, the duty that the basis send the equivalent load resistance of secondary coil in energy coil to adjust DC/DC converter
Than, comprising:
The duty ratio D of DC/DC converter is adjusted as the following formula:
In above formula, RLeqFor the equivalent load resistance for sending secondary side in energy coil, V ' is the output of preset DC/DC converter
DC voltage, IsampFor the amplitude for sending secondary current in energy coil, D is the duty ratio of DC/DC converter.
Wherein, the equivalent load resistance R for sending secondary side in energy coil is determined as the following formulaLeq:
In above formula, k is the coefficient of coup that send can between coil Central Plains sideline circle and secondary coil, RsIt is secondary in energy coil to send
The resistance of sideline circle, QpFor the quality factor for sending energy coil Central Plains sideline circle, QsFor send can in coil secondary coil quality because
Number.
Specifically, the duty ratio for utilizing the DC/DC converter after adjusting and the DC voltage for powering load
Obtain the output DC voltage of DC/DC converter, comprising:
The output DC voltage V of DC/DC converter is determined as the following formulao,b:
In above formula, Vi,bFor the DC voltage for powering load.
Specifically, the output DC voltage control energy-storage units charge and discharge using the DC/DC converter, comprising:
When the corresponding transimission power of output DC voltage of the DC/DC converter is greater than bearing power, the DC/DC
Converter output voltage is higher than the voltage at the energy-storage units both ends, and the energy-storage units charge；
When the corresponding transimission power of output DC voltage of the DC/DC converter is less than bearing power, the DC/DC
Converter output voltage is lower than the voltage at the energy-storage units both ends, and the energy-storage units discharge；
When the corresponding transimission power of output DC voltage of the DC/DC converter is equal to bearing power, the DC/DC
Converter output voltage is equal to the voltage at the energy-storage units both ends, and the energy-storage units, which do not charge, also not to discharge.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail referring to above-described embodiment for pipe, it should be understood by those ordinary skilled in the art that: still
It can be with modifications or equivalent substitutions are made to specific embodiments of the invention, and without departing from any of spirit and scope of the invention
Modification or equivalent replacement, should all cover within the scope of the claims of the present invention.
Claims (10)
1. a kind of wireless energy transfer system, which is characterized in that the system comprises: DC power supply, H bridge inverter, first are mended
It repays capacitor, the second compensating electric capacity, send energy coil, rectifier bridge, DC/DC converter and energy-storage units；
The DC power supply accesses the DC side of the H bridge inverter, and the exchange side of H bridge inverter is by the first compensation electricity
Hold and is connect with the primary coil for sending energy coil；
The secondary coil for sending energy coil is connected by second compensating electric capacity with the side that exchanges of rectifier bridge；
The DC side of the rectifier bridge is connect with the input terminal of DC/DC converter；
The output end of the DC/DC converter is connected to energy-storage units and load respectively.
2. the system as claimed in claim 1, which is characterized in that the H bridge inverter is made of two bridge arms in parallel,
In, the switching device that bridge arm is serially connected by two forms.
3. system as claimed in claim 2, which is characterized in that the switching device is reversed by semiconductor switch pipe and diode
It composes in parallel.
4. the system as claimed in claim 1, which is characterized in that the rectifier bridge is made of two bridge arms in parallel, wherein bridge
The diode that arm is serially connected by two forms.
5. a kind of control method of wireless energy transfer system according to any one of claims 1-4, which is characterized in that described
Method includes:
The supply voltage that the H bridge inverter provides DC power supply is converted to alternating voltage；
The exchange side for sending energy coil that the alternating voltage is sent to the rectifier bridge；
Received alternating voltage is converted to the DC voltage for being used for powering load by the rectifier bridge, and is used for described to negative
The DC voltage for carrying power supply is sent to the input terminal of the DC/DC converter；
The DC/DC converter utilizes the received DC voltage for powering load to load supplying or control energy-storage units
Charge and discharge.
6. method as claimed in claim 5, which is characterized in that the DC/DC converter utilizes received for supplying to load
The DC voltage of electricity is to load supplying or control energy-storage units charge and discharge, comprising:
According to the duty ratio for the equivalent load resistance adjusting DC/DC converter for sending secondary coil in energy coil；
Duty ratio using DC/DC converter and the DC voltage for powering load determine that the output of DC/DC converter is straight
Galvanic electricity pressure；
Using the output DC voltage of the DC/DC converter to load supplying or control energy-storage units charge and discharge.
7. method as claimed in claim 6, which is characterized in that the basis send the equivalent load electricity of secondary coil in energy coil
Resistance adjusts the duty ratio of DC/DC converter, comprising:
The duty ratio D of DC/DC converter is adjusted as the following formula:
In above formula, RLeqFor the equivalent load resistance for sending secondary side in energy coil, V ' is the output direct current of preset DC/DC converter
Voltage, IsampFor the amplitude for sending secondary current in energy coil, D is the duty ratio of DC/DC converter.
8. the method for claim 7, which is characterized in that determine the equivalent load resistance for sending secondary side in energy coil as the following formula
RLeq:
In above formula, k is the coefficient of coup that send can between coil Central Plains sideline circle and secondary coil, RsTo send secondary sideline in energy coil
The resistance of circle, QpFor the quality factor for sending energy coil Central Plains sideline circle, QsFor the quality factor for sending secondary coil in energy coil.
9. method as claimed in claim 6, which is characterized in that it is described using adjust after DC/DC converter duty ratio and
The output DC voltage of DC/DC converter is obtained for the DC voltage of powering load, comprising:
The output DC voltage V of DC/DC converter is determined as the following formulao,b:
In above formula, Vi,bFor the DC voltage for powering load.
10. method as claimed in claim 6, which is characterized in that the output DC voltage using the DC/DC converter
Control energy-storage units charge and discharge, comprising:
When the corresponding transimission power of output DC voltage of the DC/DC converter is greater than bearing power, the energy-storage units
It charges；
When the corresponding transimission power of output DC voltage of the DC/DC converter is less than bearing power, the energy-storage units
It discharges；
When the corresponding transimission power of output DC voltage of the DC/DC converter is equal to bearing power, the energy-storage units
It does not charge and does not discharge yet.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111431297A (en) * | 2020-04-25 | 2020-07-17 | 哈尔滨工业大学 | Multi-relay multi-load bidirectional wireless power transmission system with strong anti-offset performance |
| CN113824193A (en) * | 2021-10-27 | 2021-12-21 | 四川大学 | Impedance matching method, impedance matching device, reinforcement learning controller and computer readable storage medium |
-
2019
- 2019-06-17 CN CN201910519924.5A patent/CN110289693A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111431297A (en) * | 2020-04-25 | 2020-07-17 | 哈尔滨工业大学 | Multi-relay multi-load bidirectional wireless power transmission system with strong anti-offset performance |
| CN111431297B (en) * | 2020-04-25 | 2023-09-08 | 哈尔滨工业大学 | Multi-relay multi-load bidirectional wireless power transmission system with strong anti-offset performance |
| CN113824193A (en) * | 2021-10-27 | 2021-12-21 | 四川大学 | Impedance matching method, impedance matching device, reinforcement learning controller and computer readable storage medium |
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