CN104681249B - Modified non-contact transformer with secondary current phase-detection function - Google Patents
Modified non-contact transformer with secondary current phase-detection function Download PDFInfo
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Abstract
The present invention provides a kind of modified non-contact transformer with secondary current phase-detection function, the non-contact transformer includes primary and secondary side, primary side includes primary side magnetic core and primary side winding, secondary includes secondary magnetic core and vice-side winding, the primary side also includes test winding and stream voltage conversion circuit, the test winding and primary side winding share primary side magnetic core, and the test winding short circuit, test the output incoming stream voltage conversion circuit of winding.The present invention is by rationally designing primary side winding and test winding so that the flux portion that primary side winding each several part electric current is produced in test winding each several part offsets or offseted completely.By by the test short circuit in winding of non-contact transformer primary side so that the short circuit current flow of test winding meets linear relationship all the time with secondary current under the conditions of loose coupling and change air gap, and obtain by flowing voltage conversion circuit the voltage signal of same-phase.
Description
Technical field
The present invention relates to the non-contact transformer used a kind of energy transmission system suitable for noncontact, belong to electric current mutual
Sensor or field of conversion of electrical energy.
Background technology
Non-contact power is the new electric energy transmission mode that " wireless power " is realized based on magnetic coupling, complete using former secondary
Fully separating non-contact transformer, passes through the coupled transfer electric energy of high frequency magnetic field so that electric energy transmission equipment side in energy transfer process
It is not physically connected that (abbreviation supply side) and electric energy receive side (abbreviation power side).Compared with traditional contact is powered, noncontact
Power supply easy to use, safe, no-spark and Danger Electric shock risk, no laying dust and contact loss, no mechanical wear and corresponding maintenance are asked
Topic, is suitable for a variety of bad weathers and environment, is easy to implement automatic power.Non-contact power technology is because of its distinctive adverse circumstances
Adaptability, high security, few maintenance and convenience, in mobile devices such as mobile phone, robot, human body implantation equipment, electric automobiles
Power supply occasion, applied in the bad environments such as oil field, mine, underwater power or inflammable and explosive occasion.
In non-contact electric energy transmission system, supply side and power side generally there are relative motion, can cause in system
Change on the structural parameters of core component --- non-contact transformer, so as to cause its coefficient of coup, leakage inductance, magnetizing inductance etc.
The change of circuit parameter, the change of parameter not only has influence on output performance, system is also can result in when serious out of control.This is required
The control method of noncontact converter should be able to adaptive circuit variable element the characteristics of, it is ensured that stability and good rapidity.
Xiaoyong Ren,Qianhong Chen,Lingling Cao,Xinbo Ruan,Siu-chungWong,Chi.KTse,
“Characterization and Control of Self-Oscillating Contactless Resonant
Converter with Fixed Voltage Gain ", IPEMC, 2012 propose suitable for noncontact converter it is a kind of from
Swash control method, by detecting the phase of non-contact transformer secondary current or rectifier bridge electric current, obtained using Zero-cross comparator
The drive signal of converter bridge switching parts pipe, makes noncontact converter automatically operate in the constant frequency of voltage gain under the conditions of variable element
Rate point, realizes varying load and exports substantially constant under the conditions of change air gap.The control method is simple, and can respond quickly to become automatically
The Parameters variation of parallel operation.In this control program, how power side electric current to be measured is quickly and correctly detected in supply side
Phase information, the key for being able to fully demonstrate as the control method advantage.Other many control methods are also required in power supply
Detect the phase information of power side electric current in side.Such as J.Huh, W.Lee, G.H Cho, B.Lee, C.T Rim,
“Characterization ofnovel inductive powertransfer systems for on-line
Propose that when supply side is inputted be Constant current input in electric vehicles ", APEC, 2011, can be by making system secondary real
Now complete resonance reaches the constant purpose of output voltage under the conditions of varying load.Under the conditions of variable element, to realize that secondary is completely humorous
Shake, it is necessary to detect the phase information of secondary current.In addition, secondary resonance still ensures the condition of maximum power transfer, this is same
Sample needs to detect the phase information of secondary current.It can be seen that, the current phase information for detecting power side in supply side turns into many
One of key point that noncontact inverter control method is achieved.
The non-contact signal that power side measured signal is fed back into supply side in current non-contact electric energy transmission system is fed back
Mode mainly has the detection modes such as infrared ray and radio frequency.These modes are all active detection modes, that is, signal detection part
Need power supply and corresponding active converter circuit.P.Si, A.P.Hu, J.W.Hsu, M.Chiang, Y.Wang, S.Malpas and
D.Budgerr, " Wireless power supply for implantable biomedical device based on
Primary input voltage regulation ", IEEE conference on Industrial Electronics
AndApplication, 2007,235-239 give the structure for detecting power side output voltage in supply side using RF-wise
Block diagram, output voltage information sequentially passes through the modulus conversion chip and radio transceiver of power side, sends radiofrequency signal, is supplying
Electric side receives radiofrequency signal with radio transceiver, then obtains output voltage information, other active inspections via analog-digital chip
Survey scenario-frame similar.In these active detection schemes, its detecting element is positioned over the power side of non-contact electric energy transmission system,
Because there is the limitation of electric energy supply in power side so that the application of active detection scheme has larger limitation.For example, starting
Before, power side is supplied without electric energy, and feedback signal is out of control to be influenceed to start；In start-up course, power side power supply instability, signal is anti-
Feedforward distortion, influence system work；When loading dynamic change, power side is powered impacted, can also interfere with detection signal so as to influenceing
The stabilization of non-contact electric energy transmission system, reliably working.In addition, active detection scheme uses the processing mode of multi-stag, for
The occasion of detection current phase information is needed, larger delay or phase distortion may be caused.Therefore, how nothing is used in power side
Source mode, which detects current phase information and quickly and accurately feeds back to supply side, becomes electric current in non-contact electric energy transmission system
The difficult point of phase-detection.
Conventional electric current passive detection scheme is the current transformer based on detection resistance.Electric current to be measured flow into excitation around
Group, detection resistance and in test winding two ends, by obtaining detection resistance terminal voltage, obtains the numerical value or phase letter of electric current to be measured
Breath.Conventional current transformer original vice-side winding close coupling, its magnetizing inductance is very big, leakage inductance very little, therefore the electric current of detection resistance
And terminal voltage meets linear relationship with electric current to be measured.But in non-contact electric energy transmission system, for measuring power side electric current
Current transformer, it encourages winding and test winding equally to want office loose coupling between power side and supply side, winding, excitatory electricity
Feel very little, leakage inductance very big；In addition, under the conditions of air gap is become, current transformer magnetizing inductance and leakage inductance numerical value change.Adopt
Add the method for resistance detection with loose coupling current transformer, because test winding current be between resistor current and electric current to be measured it is no longer full
Sufficient linear relationship, it is impossible to the phase information for detecting electric current to be measured.
Therefore, Kaiqin Yan, Qianhong Chen, Jia Hou, Wenxian Chen, Xiaoyong Ren and
Xinbo Ruan“Self-Oscillating Contactless Resonant Converter with Phase
Detection Contactless Current Transformer, " IEEE ECCE, 2013, pp.2920-2927 provide
Noncontact current transformer is by by the test short circuit in winding of current transformer so that the leakage inductance and magnetizing inductance of test side are mutually simultaneously
Connection.From the T-shaped equivalent circuit of current transformer, electric current to be measured by ideal transformer converted according to the turn ratio after through magnetizing inductance
Branch road and test side leakage sense branch circuit parallel connection circulation.Electric current to be measured flows into test side leakage sense branch road in impedance ratio, due to two parts
Identical impedance property is pure inductance, then the electric current and electric current to be measured for flowing into test side leakage sense branch road are linear, so surveying
There is linear relationship in the short circuit current flow and electric current to be measured for trying winding.When non-contact electric energy transmission system air gap changes, Current Mutual Inductance
Device parameter changes, but current transformer its parallel branch impedance property of test short circuit in winding it is identical the characteristics of do not change
Become, thus do not interfere with the characteristic that test winding current meets linear relationship with electric current to be measured, can only change the linear relationship
Proportionality coefficient.It ensure that loose coupling and become under the conditions of air gap, using current transformer, power side electric current is accurately detected in supply side
Phase information.
The electric current of power side Transformer Winding is detected using independent noncontact current transformer, although can be in supply side
Power side current phase is carried out to need additionally to increase element in passive detection, but system --- noncontact current transformer.This
The number of device is added, is unfavorable for the raising of system power-density.Meanwhile, introducing independent noncontact current transformer will
The secondary tandem of non-contact transformer of its excitation side winding with undertaking power transmission function, changes the circuit ginseng of primary side
Number, secondary compensation electric capacity needs to redesign, and noncontact current transformer is introduced under the conditions of same design can also increase secondary benefit
Repay the voltage stress of electric capacity.In addition, the measuring accuracy in order to ensure secondary current, will reduce non-contact transformer and Current Mutual Inductance
The magnetic coupling of device, this needs that certain distance will be kept between non-contact transformer summation current transformer and uses shield technology.
Obviously, this reduction for being also unfavorable for system dimension.Non-contact transformer can be directly utilized without independent current transformer certainly
Body realizes a direction of the detection as research of electric energy transmission and secondary current phase simultaneously.
The content of the invention
The invention aims to overcome the shortcoming of said structure, it is proposed that a kind of to realize the basis of above-mentioned functions
On, it is not necessary to the modified non-contact transformer of independent noncontact current transformer.
The object of the invention is realized by following measures：
A kind of modified non-contact transformer modified non-contact transformer with secondary current phase-detection function, should
Non-contact transformer includes primary and secondary side, and primary side includes primary side magnetic core and primary side winding, and secondary includes secondary magnetic core and secondary
Winding, the primary side also includes test winding and stream voltage conversion circuit, and the test winding and primary side winding share primary side magnetic core, and
The test winding short circuit, tests the output incoming stream voltage conversion circuit of winding.
The further design of the present invention is：
The primary side winding by a winding or multiple windings, forward or reversely combine and constitute by connection in series-parallel, vice-side winding
Combined and constituted by a winding or multiple winding connection in series-parallel, test winding forward connected by a winding or multiple windings or
The combination of person's differential concatenation is constituted.
By the annexation for adjusting primary side winding and test winding each several part so that primary side winding and each portion of test winding
Divide magnetic flux coupling relativeness inconsistent, forward direction coupling and reverse coupled exist simultaneously, the electric current of primary side winding each several part is in survey
The flux portion produced in examination winding each several part offsets, by adjusting the area of test winding encirclement, relative to primary side winding
Position and the number of turn, can ideally realize and offset completely.
Wherein, transformer primary side and transformer secondary structure asymmetric (not including test winding), and test winding is relative
Primary side excitation field antisymmetry arranges, the magnetic flux algebraical sum that is produced in primary side winding of test winding current is close to zero.
Wherein, the stream voltage conversion circuit will be surveyed using Hall sensor, tightly coupled current transformer or Rogowski coil
Examination winding current is converted to voltage signal output.
Wherein, the primary side magnetic core is spelled using E types, I types, U-shaped, edge extension U-shaped magnetic core or by above combination of shapes
The magnetic core connect；Secondary magnetic core using E types, I types, the U-shaped magnetic core of U-shaped, edge extension or spliced by above combination of shapes and
Into magnetic core.
Wherein, the primary side magnetic core and secondary magnetic core can use ferromagnetic material silicon steel sheet, ferrite, crystallite, ultracrystallite
Or permalloy is made, or non-magnet material air, ceramics, plastics are used to be made.
Wherein, the wire of the primary side winding, vice-side winding and test winding can select solid conductor, Litz lines, copper
Band, hollow copper tubing or PCB windings.
It is of the invention add independent noncontact current transformer scheme with existing non-contact transformer compared with have it is following excellent
Point：
1st, the present invention tests side winding and the knot of non-contact transformer primary side winding by rationally designing non-contact transformer
Structure, substantially reduces the coefficient of coup of primary side winding and test winding, realizes noncontact current transformer test winding and non-connects
Thixotroping depressor primary side winding shares primary side magnetic core, and greatly reduces interference of the primary side winding to test winding, it is no longer necessary to
Noncontact current transformer of the prior art tests side.
2nd, the present invention utilizes circuit etc. equivalent to a noncontact current transformer is accessed in original non-contact transformer
The mode of effect, the phase relation of noncontact current transformer excitation side electric current in the prior art and test side electric current is equivalent to
Non-contact transformer secondary winding current and non-contact transformer primary side test the phase relation of winding current, realize and are connect to non-
Touch the multiplexing of transformer secondary, it is no longer necessary to noncontact current transformer excitation side of the prior art.
3rd, the present invention is proposed on the basis of test side short-circuit type noncontact current transformer function in the prior art is ensured
The modified non-contact transformer, it is no longer necessary to independent noncontact current transformer, simplifies circuit structure.
4th, when the modified non-contact transformer that designs of the present invention is applied to non-contact electric energy transmission system, meet test around
There is linear relationship with electric current to be measured in group short circuit current flow.When non-contact transformer air gap changes, test winding and vice-side winding
The coefficient of coup changes, but test winding short circuit current flow it is identical with secondary winding current phase the characteristics of do not change,
The characteristic that test winding current meets linear relationship with electric current to be measured is not interfered with thus, can only change the ratio of the linear relationship
Coefficient.
Brief description of the drawings
Accompanying drawing 1-1 is existing non-contact transformer plus an application circuit of independent noncontact current transformer；
Accompanying drawing 1-2 is an application circuit of follow-on non-contact transformer of the invention；
Primary symbols title in accompanying drawing 1-1 and Fig. 1-2：Vin- input direct voltage；Q1~Q4- switching tube；G1~G4—
The drive signal of switching tube；Cp- primary side resonant capacitance；CS- secondary resonant capacitance；DR1~DR4- output commutation diode；
Cf- output filter capacitor；RL- load；Vo- output voltage；i1- non-contact transformer primary side winding electric current；i2- noncontact
Transformer secondary winding current；i3- non-contact transformer tests winding current；vc- stream voltage conversion circuit output voltage.
Accompanying drawing 1-3 is the modified non-contact transformer structure chart of the present invention；
Primary symbols title in accompanying drawing 1-3：1-non-contact transformer primary side；2-non-contact transformer secondary；3-stream
Voltage conversion circuit；i1- non-contact transformer primary side winding electric current；i2- non-contact transformer secondary winding current；i3- electric current
The test winding current of transformer；vC- stream voltage conversion circuit output voltage；M12- non-contact transformer primary side winding and non-connect
The mutual inductance of thixotroping depressor vice-side winding；M13The mutual inductance of-non-contact transformer primary side winding and test winding；M23- noncontact becomes
The mutual inductance of depressor vice-side winding and test winding；
Accompanying drawing 2 is the simplex winding magnetic flux counteracting type primary side structure chart A of the non-contact transformer of the present invention；
Accompanying drawing 3 is the simplex winding magnetic flux counteracting type primary side structure chart B of the non-contact transformer of the present invention；
Accompanying drawing 4 is two winding magnetic flux counteracting type primary side structure charts (two windings in series) of the non-contact transformer of the present invention；
Accompanying drawing 5 is two winding center coiled pipe type primary side structure charts (two windings in series) of the non-contact transformer of the present invention；
Accompanying drawing 6 is the three winding magnetic flux counteracting type primary side structure chart (three winding series connection) of the non-contact transformer of the present invention；
Accompanying drawing 7 is the three winding center coiled pipe type primary side structure chart (three winding series connection) of the non-contact transformer of the present invention；
Accompanying drawing 8 is two winding magnetic flux counteracting type primary side structure charts (two winding parallels) of the non-contact transformer of the present invention；
Accompanying drawing 9 is two winding center coiled pipe type primary side structure charts (two winding parallels) of the non-contact transformer of the present invention；
Accompanying drawing 10 is that (three winding string is simultaneously for the three winding magnetic flux counteracting type primary side structure chart of non-contact transformer of the present invention
Connection)；
Accompanying drawing 11 is that (three winding string is simultaneously for the three winding center coiled pipe type primary side structure chart of non-contact transformer of the present invention
Connection)；
Accompanying drawing 12 is the use E-type magnetic core of the present invention as non-contact transformer primary side or the schematic diagram of secondary magnetic core；
The U-shaped magnetic core of use of the present invention of accompanying drawing 13 is used as non-contact transformer primary side or the schematic diagram of secondary magnetic core；
Accompanying drawing 14 is the U-shaped magnetic core of the use edge extension of the present invention as non-contact transformer primary side or secondary magnetic core
Schematic diagram；
Accompanying drawing 15 is the U-shaped magnetic core for the edge extension that use I type core combinations of the invention are spliced as noncontact
The schematic diagram of transformer primary side or secondary magnetic core；
Accompanying drawing 16 is the circuit model for testing short circuit in winding；
Accompanying drawing 17 is the circuit model for flowing voltage conversion circuit；
Accompanying drawing 18 tests winding+stream voltage conversion circuit model；
Accompanying drawing 19 tests winding and secondary winding current waveform.
Corresponding air gap=the 10mm of wherein Figure 19-1；Corresponding air gap=the 20mm of Figure 19-2；Corresponding air gap=the 30mm of Figure 19-3.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings：The non-limiting noncontact mutual inductance for disclosing the present invention of accompanying drawing
Several specific embodiments of device, are further described as follows with reference to accompanying drawing to the noncontact transformer of the present invention：
Embodiment one：
Accompanying drawing 1-1 gives existing non-contact transformer plus the full-bridge of independent noncontact current transformer application electricity
Road, wherein 101 be non-contact transformer primary side, 102 be non-contact transformer secondary, and 103 be noncontact current transformer excitation
Side, 104 be that noncontact current transformer tests side, and 103 and 104 constitute independent noncontact current transformer.
Embodiment two：
Accompanying drawing 1-2 gives the full-bridge application circuit of modified non-contact transformer of the present invention, comparison diagram 1-1 and Fig. 1-2
It can be seen that modified non-contact transformer will not change main circuit topology, wherein 105 be primary side winding, 106 be vice-side winding,
107 be test winding, and 108 be stream voltage conversion circuit.
Embodiment three：
Accompanying drawing 1-3 gives the structured flowchart of modified non-contact transformer of the present invention, and it is by non-contact transformer primary side
1st, non-contact transformer secondary 2 and stream voltage conversion circuit 3 are constituted.
Present invention design non-contact transformer primary side 1 includes primary side magnetic core, primary side winding and test winding, noncontact transformation
The test short circuit in winding (i.e. short circuit) of device primary side 1, primary side winding can be combined and constituted by a winding or multiple winding connection in series-parallel.
Example IV：
It is primary side magnetic core, 202A and 202B test windings in series referring to accompanying drawing 2,201,203 be primary side winding, primary side
Winding 203 with test winding 202A and 202B coupled relation it is identical, because 202A and 202B is differential concatenation, thus primary side around
Group electric current flux portion for producing in test winding two parts offsets, ideally, by adjust test winding 202A and
Area, the position of relative primary side winding and the number of turn that 202B is surrounded, the magnetic flux size phase that 202A and 202B can be caused to be coupled to
Together, realize that magnetic flux offsets completely.
Embodiment five：
It is primary side magnetic core, 302A and 302B test windings in series referring to accompanying drawing 3,301,303 be primary side winding, primary side
Winding 303 with test winding 302A and 302B coupled relation it is identical, because 302A and 302B is differential concatenation, thus primary side around
Group electric current flux portion for producing in test winding two parts offsets, ideally, by adjust test winding 302A and
Area, the position of relative primary side winding and the number of turn that 302B is surrounded, the magnetic flux size phase that 302A and 302B can be caused to be coupled to
Together, realize that magnetic flux offsets completely.
Embodiment six：
It is primary side magnetic core, 402A and 402B test windings in series referring to accompanying drawing 4,401,403A and 403B are in series
Primary side winding, the coupling of primary side winding 403A and test winding 402A coupled relation and primary side winding 403B and test winding 402B
Conjunction relation is identical, and because 402A and 402B is forward to connect, 403A and 403B are differential concatenations, so primary side winding two parts are electric
The flux portion that produces in test winding two parts is flowed to offset, by adjust area, relative primary side that test winding surrounds around
The position of group and the number of turn, can ideally realize and offset completely.
Embodiment seven：
It is primary side magnetic core referring to accompanying drawing 5,501,502 be test winding, 503A and 503B primary side windings in series, primary side
Winding 503A and 503B with test winding 502 coupled relation it is identical, because 503A and 503B is differential concatenation, thus primary side around
Group two parts electric current flux portion for producing in test winding offsets, by adjusting area that test winding surrounds and relatively former
The position of side winding, can ideally realize and offset completely.
Embodiment eight：
Referring to accompanying drawing 6,601 be primary side magnetic core, 602A, 602B and 602C test winding in series, 603A, 603B and
603C primary side windings in series, primary side winding 603A and test winding 602A coupled relation, primary side winding 603B and test
Winding 602B coupled relation and primary side winding 603C is identical with the coupled relation for testing winding 602C, due to 602A, 602B and
602C is forward to connect, and 603A and 603B are differential concatenations, and 603A and 603C are forward to connect, so the part of primary side winding three is electric
The flux portion produced in test winding three part is flowed to offset, by adjust area, relative primary side that test winding surrounds around
The position of group and the number of turn, can ideally realize and offset completely.
Embodiment nine：
Referring to accompanying drawing 7,701 be primary side magnetic core, 702 for test winding, 703A, 703B and 703C primary side in series around
Group, primary side winding 703A, 703B and 703C are identical with the coupled relation for testing winding 702, because 703A and 703B is reverse string
Connection, 703A and 703C are forward to connect, so the flux portion that the portion of electrical current of primary side winding three is produced in test winding offsets,
By adjusting the area of test winding encirclement and the position of relative primary side winding, it can ideally realize and offset completely.
Embodiment ten：
It is primary side magnetic core, 802A and 802B test windings in series referring to accompanying drawing 8,801,803A and 803B parallel connections are constituted
Primary side winding, the coupling of primary side winding 803A and test winding 802A coupled relation and primary side winding 803B and test winding 802B
Conjunction relation is identical, and because 802A and 802B is forward to connect, 803A and 803B are reverse parallel connections, so primary side winding two parts are electric
The flux portion that produces in test winding two parts is flowed to offset, by adjust area, relative primary side that test winding surrounds around
The position of group and the number of turn, can ideally realize and offset completely.
Embodiment 11：
It is primary side magnetic core referring to accompanying drawing 9,901,902 be test winding, and 903A and 903B parallel connections constitute primary side winding, primary side
Winding 903A and 903B with test winding 902 coupled relation it is identical, because 903A and 903B is reverse parallel connection, thus primary side around
Group two parts electric current flux portion for producing in test winding offsets, by adjusting area that test winding surrounds and relatively former
The position of side winding, can ideally realize and offset completely.
Embodiment 12：
Referring to accompanying drawing 10,1001 be primary side magnetic core, 1002A, 1002B and 1002C test winding in series, 1003A and
1003C series arm and 1003B parallel connection constitutes primary side winding, and primary side winding 1003A and test winding 1002A coupling are closed
System, the coupling of primary side winding 1003B and test winding 1002B coupled relation and primary side winding 1003C and test winding 1002C
Relation is identical, and because 1002A, 1002B and 1002C are forward to connect, 1003A and 1003C are forward to connect, 1003A and 1003B
It is reverse parallel connection, so the flux portion that the portion of electrical current of primary side winding three is produced in test winding three part offsets, by adjusting
Area, the position of relative primary side winding and the number of turn that whole test winding is surrounded, can ideally realize and offset completely.
Embodiment 13：
Be primary side magnetic core referring to accompanying drawing 11,1101,1102 be test winding, 1103A and 1103C series arm and
1103B parallel connections constitute primary side winding, and primary side winding 1103A, 1103B and 1103C are identical with the coupled relation for testing winding 1102,
Because 1103A and 1103C are forward to connect, 1103A and 1103B are reverse parallel connections, so the portion of electrical current of primary side winding three is being surveyed
The flux portion produced in examination winding offsets, by adjusting the area of test winding encirclement and the position of relative primary side winding, reason
It can realize and offset completely in the case of thinking.In addition, the framework of the non-contact transformer primary side shown in accompanying drawing 2~11 gives primary side
Winding realized when being simplex winding, two windings, three winding primary side winding electric current flux portion for producing in test winding offset or
The method that person offsets completely, by that analogy, primary side winding can by more Multiple coil forward or reversely connection in series-parallel combine, survey
Trying winding can be by one or more winding forward or differential concatenation is combined and constituted.
The non-contact transformer secondary 2 includes secondary magnetic core and vice-side winding, vice-side winding can by a winding or
Multiple winding connection in series-parallel combinations are constituted.
The magnetic core of non-contact transformer primary side 1 and secondary 2 can be using E types, I types, a variety of shapes such as U-shaped of U-shaped, edge extension
The core type that shape and the magnetic core being spliced by above combination of shapes, non-contact transformer primary side 1 and secondary 2 are used can not
Together.
Referring to accompanying drawing 12, its primary side or secondary magnetic core use E-type magnetic core.
Referring to accompanying drawing 13, its primary side or secondary magnetic core use U-shaped magnetic core.
Referring to accompanying drawing 14, its primary side or secondary magnetic core use the U-shaped magnetic core that edge extends.
Referring to accompanying drawing 15, the U-shaped magnetic for the edge extension that its primary side or secondary magnetic core are spliced using I type core combinations
Core.
The method for the test short circuit in winding that the non-contact transformer of the present invention is used, its equivalent circuit diagram is referring to accompanying drawing
16.Wherein, vice-side winding and test winding constitute a current transformer, n1For the turn ratio, L1、L2Respectively vice-side winding side
Leakage inductance and magnetizing inductance, L3For the leakage inductance of test winding side.i2For electric current to be measured, i3For test winding current.During detection, treat
The vice-side winding that electric current flows through non-contact transformer is surveyed, according to the proportionate relationship of impedance, test winding current i can be obtained3：
From formula (1) as can be seen that test winding current and electric current to be measured are linear, the two differs only by a ratio system
Number.And when the air gap of non-contact electric energy transmission system changes, the change of magnetizing inductance and leakage inductance can not influence its line
Sexual intercourse, is only capable of changing the proportionality coefficient of the linear relationship.Therefore, still can be from the electric current for testing winding under the conditions of air gap is become
The phase information of electric current to be measured is obtained, the two remains same phase.
By the test winding of short circuit, the current signal with current in phase to be measured position has been obtained, but current signal is not
Can be directly used in control circuit, it is therefore desirable to add stream voltage conversion circuit.Meanwhile, to ensure that current transformer test winding is short
The property on road, stream voltage conversion circuit must be real by the way of small on test winding current and electric current linear relationship to be measured influence
It is existing.
Meeting the stream voltage conversion circuit of above-mentioned requirements has a variety of, and the different bandwidth of operation of corresponding change-over circuit correspondence,
The current transformer based on detection resistance is selected to be made explanations as stream voltage conversion circuit to Cleaning Principle below.
Test case one：
The present invention is used as stream voltage conversion circuit using the current transformer based on detection resistance.
Referring to accompanying drawing 17, wherein 1 current transformer constituted for the test winding and vice-side winding of short circuit (calls electric current in the following text mutual
Sensor 1), 2 be close coupling, current transformer between the current transformer (calling current transformer 2 in the following text) based on detection resistance, its winding
1 short-circuit line as current transformer 2 excitation winding.Because current transformer 2 is tightly coupled, ignore its leakage inductance, use
Transformer leakage inductance model then can obtain the circuit equivalent model shown in accompanying drawing 18-1.Wherein, L1、L3、L2Respectively current transformer
1 vice-side winding side leakage sense, magnetizing inductance and test side leakage sense, n1For its turn ratio, LmFor the magnetizing inductance of current transformer 2, n2
For its turn ratio, RCSFor detection resistance, i2For electric current to be measured, i3For the test winding current of current transformer 1, vCFor detection resistance
RCSTerminal voltage.
Converted into according to the detection resistance and magnetizing inductance that turn ratio relation can test current transformer 2 side to its excitation side,
Corresponding equivalent circuit diagram referring to accompanying drawing 18-2, wherein, equivalent resistance RCS' and equivalent magnetizing inductance Lm' be：
To reduce the error produced by current transformer 2, general its turn ratio n2Value is very big, thus it is equivalent after equivalent electric
Hinder RCS' and equivalent magnetizing inductance Lm' relative to current transformer 1 test side impedance for very little, therefore can be neglected its influence,
Think the test short circuit in winding of current transformer 1, corresponding circuit diagram can be reduced to accompanying drawing 16.And the excitation of current transformer 2
Electric current is regarded as test winding current when current transformer 1 tests the short circuit of winding, meets (1) formula.
Because the number of secondary turns of current transformer 2 is more, magnetizing inductance LmRelative to detection resistance RCSIt is very big, it can be neglected excitatory
The influence of inductance, further according to the relation between electric current and the turn ratio, then can obtain detection resistance RCSThe voltage v at two endsC：
Obviously, now electric current i to be measured2, current transformer 1 test winding current i3And detection resistance terminal voltage vCIt is mutually
Linear relationship, three's phase is always consistent, obtains detection resistance terminal voltage vCPhase information be that can obtain electric current i to be measured2
Phase.
Current transformer based on detection resistance realizes the function of stream voltage conversion circuit, accurately can will test winding
Electric current is converted into voltage signal output, by the phase for detecting the voltage signal, you can obtain modified non-contact transformer pair
The current phase of side winding.
Test case two
Experimental verification is carried out to modified non-contact transformer of the present invention using the circuit shown in accompanying drawing 1-2 below.
The wherein inverter bridge of non-contact resonant converter is using full-bridge converter topology, and former secondary uses string/string compensation side
Formula.Electric current i in the test winding of short circuit3With secondary current i2Phase is identical, is obtained and noncontact transformation via stream voltage conversion circuit
Device secondary current i2Phase identical voltage signal vc。
The primary side of non-contact transformer coiling by the way of shown in accompanying drawing 4, primary side winding is anti-for the winding of two 15 circles
To series connection, primary side test winding surrounds whole primary side winding, and test umber of turn is 2 circles, and vice-side winding is also two 15 circles
Winding differential concatenation.Primary side magnetic core and secondary magnetic core are spliced using E types and I type core combinations.Surveying sensibility reciprocal is respectively：It is former
Side winding self-induction 70uH, vice-side winding self-induction 70uH, test winding self-induction 2.18uH, when air gap distance is respectively 10mm, 20mm
During with 30mm, the coefficient of coup of primary side winding and test winding is respectively 0.0061,0.005 and 0.0009, is in close proximity to 0；
The coefficient of coup for testing winding and vice-side winding is respectively 0.03,0.026 and 0.021.
Flow voltage conversion circuit and use close coupling between the current sensor based on detection resistance, its winding, magnetic core uses new health
Up to company's model H10/6/5 toroidal cores.
The short-circuit line of the test winding of current transformer 1 is directly through the excitation winding of magnet ring, the i.e. current sensor 2
1 circle, the test umber of turn of current transformer 2 takes 100 circles, and the detection resistance used is 100 Ω.
Using model RIGOL DS1102E oscillograph, respectively former vice-side winding air gap distance be 10mm, 20mm and
It is tested during 30mm, experimental result is referring to accompanying drawing 19 (including 19-1,19-2,19-3).It can be seen from experimental waveform
Under different air gap distances, electric current i to be measured2Peak-to-peak value is all 6.48A, test winding current i3Peak-to-peak value be respectively 1.02A,
0.82A and 0.7A, without phase difference.Illustrate electric current i to be measured2With test winding current i3Meet linear relationship, and the change of air gap
Change, have no effect on the linear relationship, only influence the proportionality coefficient of the linear relationship, two amounts remain same-phase.
The new non-contact transformer that the present invention is designed is under the conditions of loose coupling and change air gap, by testing winding, is supplying
Electric side accurately detects the phase information of power side electric current, it is no longer necessary to independent noncontact current transformer.
Claims (7)
1. a kind of modified non-contact transformer with secondary current phase-detection function, the non-contact transformer includes primary side
And secondary, primary side include primary side magnetic core and primary side winding, secondary include secondary magnetic core and vice-side winding, it is characterised in that：It is described
Primary side also includes test winding and stream voltage conversion circuit, and the test winding and primary side winding share primary side magnetic core, and the test around
Group short circuit, tests the output incoming stream voltage conversion circuit of winding；
The primary side winding by a winding or multiple windings, forward or reversely combine and constitute by connection in series-parallel, and vice-side winding is by one
Individual winding or multiple winding connection in series-parallel combination are constituted, and test winding is combined and constituted by a winding or multiple windings in series；
By the annexation for adjusting primary side winding and test winding each several part so that the electric current of primary side winding each several part is in test winding
The flux portion produced in each several part offsets.
2. modified non-contact transformer as claimed in claim 1, it is characterised in that：Transformer primary side and transformer secondary knot
Structure is asymmetric, and test winding is arranged with respect to primary side excitation field antisymmetry, and test winding current is produced in primary side winding
Magnetic flux algebraical sum is close to zero.
3. modified non-contact transformer as claimed in claim 1, it is characterised in that the stream voltage conversion circuit uses Hall
Sensor, tightly coupled current transformer or Rogowski coil will test winding current and be converted to voltage signal output.
4. the modified non-contact transformer as described in any one of claims 1 to 3, it is characterised in that：The primary side magnetic core and/
Or the structure of secondary magnetic core can select：U-shaped, I types, both sides column bottom along the abducent edge expansion type in side, cross or
The combination of the above-mentioned shape of person.
5. the non-contact transformer according to any one of claims 1 to 3, it is characterised in that：The primary side magnetic core and secondary
Magnetic core can select monoblock magnetic core or be formed by polylith magnetic core using array method assembling combination.
6. the non-contact transformer as described in any one of claims 1 to 3, it is characterised in that：The primary side magnetic core and secondary magnetic
Core can select permeability magnetic material silicon steel sheet, ferrite, amorphous, crystallite, ultracrystallite, permalloy or powder core material and be made；Or
Non-magnet material air, ceramics, epoxy or plastics are made；Or it is non-by one or more permeability magnetic materials and/or one or more
Permeability magnetic material combines to realize.
7. the non-contact transformer as described in any one of claims 1 to 3, it is characterised in that：The primary side winding, vice-side winding
Solid conductor, Litz lines, copper strips, hollow copper tubing, PCB windings or combinations thereof are can select with the wire of test winding.
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| CN105553122B (en) * | 2015-12-22 | 2017-12-19 | 东南大学 | A kind of two-parameter monitoring method of four-degree-of-freedom bidirectional radio energy Transmission system |
| CN115218137B (en) * | 2016-01-22 | 2024-04-30 | 嘉兴山蒲照明电器有限公司 | Installation detection device, power module device applied by installation detection device and LED lamp |
| CN108886325B (en) * | 2016-04-06 | 2022-05-03 | 瑞典爱立信有限公司 | Power converter |
| CN110927628B (en) * | 2018-08-31 | 2021-04-06 | 株洲中车时代电气股份有限公司 | Locomotive traction transformer secondary winding short circuit diagnosis method and device |
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| CN101399114B (en) * | 2007-09-28 | 2011-07-27 | 王奉瑾 | Multiple magnetic circuit transformer |
| CN101939803B (en) * | 2008-02-06 | 2012-02-29 | 株式会社村田制作所 | Transformer and transformer device |
| JP2009212157A (en) * | 2008-02-29 | 2009-09-17 | Masakazu Ushijima | Transformer, electric circuit, current detection method, and output control method |
| CN101630577B (en) * | 2009-07-07 | 2011-11-23 | 南京航空航天大学 | Edge expansion type high coupling coefficient non-contact transformer |
| FR2990556B1 (en) * | 2012-05-09 | 2014-05-30 | Hispano Suiza Sa | THREE-PHASE TRIPHASE ROTATING TRANSFORMER FREE |
| CN102737827B (en) * | 2012-07-13 | 2015-04-22 | 南京航空航天大学 | Noncontact mutual inductor for detection of current phase |
| CN102903503A (en) * | 2012-09-21 | 2013-01-30 | 沈阳全密封变压器股份有限公司 | Concentric type voltage transformer |
| CN103474213A (en) * | 2013-09-13 | 2013-12-25 | 南京航空航天大学 | Non-contact transformer with mixed wound windings |
| CN104021922A (en) * | 2014-05-30 | 2014-09-03 | 湖南大学 | Transformer capable of achieving winding non-orthogonal decoupling |
| CN104319076B (en) * | 2014-10-08 | 2018-03-23 | 中兴通讯股份有限公司 | A kind of non-contact transformer |
| CN204596590U (en) * | 2015-03-09 | 2015-08-26 | 南京航空航天大学 | There is the modified model non-contact transformer of secondary current phase-detection function |
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