CN206341041U - A kind of fast wireless feedback arrangement - Google Patents
A kind of fast wireless feedback arrangement Download PDFInfo
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- CN206341041U CN206341041U CN201621462987.XU CN201621462987U CN206341041U CN 206341041 U CN206341041 U CN 206341041U CN 201621462987 U CN201621462987 U CN 201621462987U CN 206341041 U CN206341041 U CN 206341041U
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Abstract
The utility model provides a kind of fast wireless feedback arrangement, including cascade successively voltage or current sampling circuit, voltage frequency conversioning circuit, power amplification circuit, primary side transmitting coil, secondary receiving coil, frequency signal reception circuit, frequency-voltage conversion circuit.Line sampling is carried out by voltage or current sampling circuit to measured signal, sampled signal is then converted to by cyclical signal by voltage frequency conversioning circuit, the frequency of the cyclical signal and the amplitude of sampled signal are linearly proportional.The frequency information of cyclical signal is wirelessly delivered to from primary side by secondary by the circuit of cascade again, the square wave voltage signal of identical frequency is exported.Then square wave voltage signal is converted to by DC level signal by frequency-voltage conversion circuit, the DC level signal and primary side voltage to be measured or electric current are linearly proportional；Whole process does not have systematic error, and time delayses are less than the cycle of an output signal.
Description
Technical field
The utility model is related to a kind of structure of the output signal fast wireless transmission suitable for contactless power supply system, category
In signal detection and transmission field.
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
Noncontact converter needs the change of monitoring output voltage or electric current in real time, is allowed in controllable scope.
In current application, it will usually use two class technical schemes, a kind of is the rear class addition perseverance in noncontact converter
Pressure or the converter of constant current, the wide scope of noncontact converter output voltage or electric current is born by the converter of rear class
Change, while using wireless feedback scheme by the information transmission of output voltage to primary side, such as 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 and Application, 2007,235-239, which give use, penetrates
Frequency mode detects the structured flowchart of power side output voltage in supply side, and the modulus that output voltage information sequentially passes through power side turns
Chip and radio transceiver are changed, radiofrequency signal is sent, radiofrequency signal is received with radio transceiver in supply side, then via number
Mould conversion chip obtains output voltage information, and other active detection scheme structures are similar.The greatest problem of such a mode is output
The speed that information of voltage is delivered to primary side is slower, and a millisecond magnitude is reached on the response time, such as with this kind of mode directly as voltage
Feedback, then converter primary side is unable to the change of real-time response output voltage, and whole changer system may job insecurity, institute
It is generally used for the occasion that output loading change is relatively delayed in this way.
Another is to control output voltage constant by indirect mode, such as Xiaoyong Ren, Qianhong
Chen,Lingling Cao,Xinbo Ruan,Siu-chung Wong,Chi.K Tse,“Characterization and
Control of Self-Oscillating Contactless Resonant Converter with Fixed Voltage
The phase by detecting non-contact transformer secondary current or rectifier bridge electric current that Gain ", IPEMC, 2012 are proposed, was utilized
Zero balancing obtains the drive signal of converter bridge switching parts pipe, noncontact converter is automatically operated in voltage increasing under the conditions of variable element
The constant Frequency point of benefit, realizes varying load and exports substantially constant under the conditions of change air gap., can be with for secondary current phase sample
Using 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, the pp.2920-2927 noncontact electric currents provided
The methods such as transformer are realized.Such a mode noncontact converter possesses preferable dynamic response to load and the change of air gap
Can, but open loop situations are substantially still operated under noncontact converter under the pattern, output voltage can only follow input electricity
Pressure, due to the presence of line impedance, the voltage accuracy and load regulation of output voltage are poor.Further, since under the pattern
Phase is restrained, so output voltage can not accurately be adjusted in primary side.
Thus it is possible to which the no voltage or current signal for fast and accurately directly detecting secondary in primary side becomes research
A direction.
The content of the invention
Goal of the invention：For above-mentioned prior art, a kind of fast wireless feedback arrangement is proposed, can fast and accurately be detected
The output voltage or current signal of noncontact converter.
Technical scheme：A kind of fast wireless feedback arrangement, including cascade successively voltage or current sampling circuit, voltage frequently
Rate change-over circuit, power amplification circuit, primary side transmitting coil, secondary receiving coil, frequency signal reception circuit, voltage to frequency turn
Change circuit；Wherein：
The voltage or current sampling circuit are used to sample to tested voltage or electric current, and the signal of sampling is changed
For the input voltage of the voltage frequency conversioning circuit；
The voltage frequency conversioning circuit is used to convert input voltage into cyclical signal, the frequency of the cyclical signal
Rate and the input voltage are linearly proportional；
The power amplification circuit is used for the current signal that the cyclical signal is converted to identical frequency, and passes to
The primary side transmitting coil；
The primary side transmitting coil is used to the current signal received being converted to magnetic field signal；
The secondary receiving coil is used to receive the magnetic field signal, and the magnetic field signal is converted into identical frequency
Alternating voltage or current signal；
The alternating voltage or current signal that the frequency signal reception circuit is used to export the secondary receiving circuit enter
The first square wave voltage signal, the frequency of first square wave voltage signal and secondary receiving coil output are exported after row shaping
The voltage or current signal frequency it is identical；
The frequency-voltage conversion circuit is used to first square wave voltage signal being converted to DC level signal.
Further, the voltage frequency conversioning circuit includes voltage-controlled mirror-image constant flow source and clock generating circuit；Institute
It is the voltage or the output voltage of current sampling circuit to state the control signal of voltage-controlled mirror-image constant flow source, and the clock signal occurs
Circuit includes capacitance group and logic circuit；The voltage-controlled mirror-image constant flow source enters under control signal control to the capacitance group
Line period charges, and the logic circuit exports the cyclical signal of same frequency according to the capacitance group charge frequency.
Further, the power amplification circuit includes DC/DC converters, and the inductance of the DC/DC converters is used as institute
State primary side transmitting coil；The DC/DC converters are operated in pressure continuous mode and output no-load, the DC/DC converters
Feedback reference and supply voltage are into fixed proportion, and the clock frequency of the DC/DC converters is by the voltage frequency conversioning circuit
The cyclical signal control of output.
Further, the frequency-voltage conversion circuit includes frequency duty cycle conversion circuit and RC circuits；The frequency
Duty cycle conversion circuit is used to first square wave voltage signal being converted to dutycycle with described the by monostable flipflop
Second square wave voltage signal of one square wave voltage signal frequency change, second square wave voltage signal and the first square-wave voltage letter
Number frequency it is identical, the linear ratio of frequency of the dutycycle of second square wave voltage signal and first square wave voltage signal
Example relation；The RC circuits are used to export direct current average voltage after being filtered second square wave voltage signal.
Further, the frequency-voltage conversion circuit includes fixed constant-current source, electric capacity charging network, sampling holding electricity
Road；First square wave voltage signal of the frequency signal reception circuit output controls the fixed constant-current source to electric capacity charging network
Charged, the pulsewidth of the charging voltage peak value of the electric capacity charging network and first square wave voltage signal is directly proportional；Institute
State the voltage signal that sampling hold circuit output voltage amplitude is equal to the charging voltage peak value.
Further, the voltage-controlled mirror-image constant flow source includes first via current source and the second road current source, the capacitance group
Including electric capacity C1 and electric capacity C2, the logic circuit includes N type switch tube M4 and M6, comparator A2 and A3, rest-set flip-flop A4；Institute
State first via current source to charge to the electric capacity C1, second road current source charges to the electric capacity C2, the N type switch tube
M4 is connected in parallel on the electric capacity C1 two ends, and the N type switch tube is connected in parallel on the electric capacity C2 two ends, the positive input of the comparator A2
End connection N type switch tube M4 drain electrode, the drain electrode of the comparator A3 connections N type switch tube M6, the comparator
A2 and A3 negative input end be all connected with reference voltage V ref1, the comparator A2 and A3 output end connect respectively the RS touch
Device A4 S ends and R ends is sent out, the Q ends of the rest-set flip-flop connect the grid of the N type switch tube M4, the Q of the rest-set flip-flop A4
Non- end connects the grid of the N type switch tube M6, and the Q ends of the rest-set flip-flop also export the periodicity by non-inverting buffer
Signal.
Beneficial effect：A kind of fast wireless feedback arrangement of the present utility model, passes through voltage or current sampling circuit pair
Voltage or electric current to be measured carry out line sampling, and sampled signal then is converted into periodically electricity by voltage frequency conversioning circuit
Pressure or current signal, the frequency of the cyclical signal and the amplitude of sampled signal are linearly proportional.Put again by power
Big circuit, primary side transmitting coil, secondary receiving coil and frequency signal reception circuit are by the frequency information of cyclical signal with nothing
The mode of line is delivered to secondary from primary side, exports the square wave voltage signal of identical frequency.In embodiment 1, then accounted for by frequency
The square wave voltage signal of frequency signal reception circuit output is modulated to the side that dutycycle and frequency are directly proportional by sky than change-over circuit
Wave voltage signal, finally by dutycycle voltage conversion circuit, carries out amplitude modulation and filtering, finally in pair by the square wave voltage signal
While obtaining and primary side voltage to be measured or the linearly proportional d. c. voltage signal of electric current.
In said process, there is no time delayses between voltage or the input signal and output signal of current sampling circuit,
There is no systematic error.The frequency of voltage frequency conversioning circuit output signal with input signal amplitude real-time change, between do not have
Systematic error, time delayses are less than the cycle of an output signal.Power amplification circuit, primary side hair for transmitting frequency information
Ray circle, secondary receiving coil and frequency signal reception circuit, it is inputted between cyclical signal and output square wave voltage signal
Time delayses be less than cycle of output signal, and without systematic error.Frequency duty cycle conversion circuit, the square wave of input
Voltage signal and the duty of the square wave voltage signal of output do not have time delayses, and without systematic error.Dutycycle voltage conversion
Circuit, the time delayses between the adjustable square wave voltage signal of dutycycle of input and the direct current average voltage of output are filtered electrical
6 times of road time constant, do not have systematic error between dutycycle and output direct current average voltage.By rationally setting electric voltage frequency
Filter circuit time constant in the frequency and dutycycle voltage conversion circuit of the output voltage signal of change-over circuit, output voltage
Signal can fast and stable the change for following measured signal.
In embodiment 2, frequency-voltage conversion circuit includes fixed constant-current source, electric capacity charging network, sampling hold circuit；Frequently
The fixed constant-current source of the first square wave voltage signal control of rate signal receiving circuit output charges to electric capacity charging network, electric capacity
The charging voltage peak value of charging network and the pulsewidth of the first square wave voltage signal are directly proportional；Sampling hold circuit output voltage amplitude
It is approximately equal to the voltage signal of the charging voltage peak value.
Brief description of the drawings
Fig. 1 is the entire block diagram of fast wireless feedback arrangement, and 101 be voltage or current sampling circuit；102 be electric voltage frequency
Change-over circuit；103 be power amplification circuit；104 be primary side transmitting coil；105 be secondary receiving coil；106 be frequency signal
Receiving circuit；107 be frequency-voltage conversion circuit.S1 is measured signal；V2 is the output voltage of sample circuit；V3 be voltage frequently
The cyclical signal of the output of rate change-over circuit；V4 is the output square wave voltage signal of frequency signal reception circuit；V5 is frequency
The DC level signal of the output of voltage conversion circuit.I1 is the electric current of primary side transmitting coil；I2 is the electricity of secondary receiving coil
Stream.
Fig. 2 is a kind of voltage sampling circuit, and S1_V is voltage signal to be measured；V2 is the output voltage of sample circuit；R1 is
Upper divider resistance；R2 is lower divider resistance.
Fig. 3 is a kind of current sampling circuit, and S1_I is current signal to be measured；V2 is the output voltage of sample circuit；R3 is
Current sampling resistor.
Fig. 4 is a kind of voltage frequency conversioning circuit, in figure：1021 be voltage-controlled mirror-image constant flow source；1022 be that clock signal is sent out
Raw device；Vcc is supply voltage；Voltage on the basis of Vref1；Vc1 and Vc2 are respectively the voltage on electric capacity C1 and C2；Vg1 and Vg2
Respectively switching tube M4 and M6 driving voltage；M1, M2 and M5 are p-type switching tube；M3, M4 and M6 are N type switch tube；A1 is fortune
Calculate amplifier；A2 and A3 is comparator；A4 is rest-set flip-flop；Rsen is current sampling resistor.
Fig. 5 is a kind of signal transmission circuit, in figure：103 be power amplification circuit；104 be primary side radiating circuit；Vcc is
Supply voltage；Vout is output voltage；Vref2 is voltage reference；V3 believes for the periodicity of the output of voltage frequency conversioning circuit
Number；M5 is p-type switching tube；M6 is N type switch tube；Cin is input filter capacitor；Cout is output filter capacitor；A7 is driving
Circuit；A8 is operational transconductance amplifiers；Vcomp is A8 output voltage；L1 is primary side transmitting coil inductance；I1 sends out for primary side
Ray loop current.
Fig. 6 is that a kind of signal is received and shaping circuit, and 105 be secondary receiving circuit；106 be frequency signal reception circuit；
L2 is secondary receiving coil inductance；N1 and N2 are respectively the primary and secondary side umber of turn of current transformer；R4 is resistance；A9 and
A10 is zero-crossing comparator；A11 is rest-set flip-flop；V4 is the square wave voltage signal after shaping；I2 is the electricity of secondary receiving coil
Stream.
Fig. 7 is a kind of frequency duty cycle conversion circuit of embodiment 1, and V4 is input square wave voltage signal；V5 is straight for output
Flow voltage signal；A12 is monostable flipflop, and VM is A12 output voltage signal；Resistance R5 and electric capacity C3 constitute one low
Bandpass filter circuit.
Fig. 8 is a kind of frequency duty cycle conversion circuit 2 of embodiment 2, and Vcc is supply voltage, and Iref is constant-current source, and VS is
Voltage source, S1, S2 and S3 are switch, can be made up of the MOSFET of N-type or p-type；C4 is charging capacitor, and C5 is sampling electricity
Hold, C6 is output capacitance；A13 is operational amplifier, and V_C4 is C4 voltage, and V_C5 is C5 voltage, and V5 is output voltage.
Fig. 9 is primary symbols title in the waveform of voltage frequency conversioning circuit shown in Fig. 4, figure：Vref1 is voltage reference；
Vc1 and Vc2 are respectively the voltage on electric capacity C1 and C2；V3 is output periodic square wave voltage signal；Ton and Toff are respectively V3
High level and low level time.
Figure 10 is that signal is received and shaping circuit waveform, and V3 is the periodic square wave voltage that voltage frequency conversioning circuit is exported
Signal；I1 is primary side transmitting coil current waveform；I2 is secondary receiving coil current waveform；V4 is that signal is received and shaping circuit
Export square wave voltage signal；F_v3 is V3 frequency；IL_pp is I1 circuit peak-to-peak value.
Figure 11 is the work wave of circuit shown in Fig. 7, and V4 is that signal is received and shaping circuit output square wave voltage signal；VM
For the output square wave voltage signal of monostable trigger；V5 is the voltage after VM signal filterings, and its amplitude is V5=5*t1*f_
V3, wherein t1 are the fixed pulse width time of monostable flipflop, and f_v3 is V4 frequency.
Figure 12 is the switching sequence figure of switch S1, S2 and S3 in circuit shown in Fig. 8, and wherein high level is open-minded, low level
For shut-off.
Figure 13 is the Vital Voltage waveform in circuit shown in Fig. 8, and V_C4 is the voltage waveform on electric capacity C4, and V_C5 is electric capacity
Voltage waveform on C5.
The simulation result of circuit shown in Figure 14 Fig. 7, V5 is the output signal of frequency-voltage conversion circuit 1, and S1_V is to be measured
Voltage signal, VM is the output signal of monostable flipflop.
The simulation result of circuit shown in Figure 15 Fig. 8, V (s1), V (s2) and V (s3) believe for switch S1, S2 and S3 driving
Number, high level is conducting, and low level is shut-off；V (V_C4) and V (V_C5) is electric capacity C4 and C5 voltage waveform.
Embodiment
The utility model is done below in conjunction with the accompanying drawings and further explained.
Embodiment 1：A kind of fast wireless feedback arrangement, as shown in figure 1, the voltage including cascading successively or current sample electricity
Road 101, voltage frequency conversioning circuit 102, power amplification circuit 103, primary side transmitting coil 104, secondary receiving coil 105, frequency
Rate signal receiving circuit 106, frequency-voltage conversion circuit 107.Wherein：
Voltage or current sampling circuit 101 are used to sample to tested voltage or electric current, and the signal of sampling is changed
For the input voltage of voltage frequency conversioning circuit 102.
A kind of voltage sampling circuit, divider resistance R1 and R2 that voltage signal S1_V to be measured passes through series connection are given in Fig. 2
Sample, input voltage S1_V and output voltage V2 relation are：
It can be obtained from formula (1), V2 and S1_V meet linear ratio relation, without systematic error.
A kind of current sampling circuit is given in Fig. 3, current signal S1_I to be measured passes through sampling resistor R3, input current
S1_I and the output voltage V2 at sampling resistor R3 two ends relation is：
It can be obtained from formula (2), V2 and S1_I meet linear ratio relation, without systematic error.
Voltage frequency conversioning circuit 102 is used to input voltage V2 being converted to cyclical signal, the frequency of the cyclical signal
Rate and input voltage V2 are linearly proportional.In the present embodiment, voltage frequency conversioning circuit 102 includes voltage-controlled mirror-image constant flow source
1021 and clock generating circuit 1022.The control signal of voltage-controlled mirror-image constant flow source 1021 is voltage frequency conversioning circuit 102
Output voltage V2.Clock generating circuit 1022 includes capacitance group and logic circuit；Voltage-controlled mirror-image constant flow source 1021 is in control
Periodicity charging is carried out to capacitance group under signal V2 controls processed, logic circuit exports the week of same frequency according to capacitance group charge frequency
Phase property signal.
Fig. 4 gives a kind of physical circuit of voltage frequency conversioning circuit, wherein, voltage-controlled mirror-image constant flow source 1021 includes the
Constant-current source and the second road constant-current source all the way, capacitance group include electric capacity C1 and electric capacity C2, logic circuit include N type switch tube M4 and
M6, comparator A2 and A3, rest-set flip-flop A4.First via constant-current source charges to electric capacity C1, and the second road constant-current source is to the electric capacity C2
Charging, N type switch tube M4 is connected in parallel on electric capacity C1 two ends, and N type switch tube is connected in parallel on electric capacity C2 two ends, comparator A2 positive input terminal
N type switch tube M4 drain electrode is connected, comparator A3 connection N type switch tubes M6 drain electrode, comparator A2 and A3 negative input end is equal
Reference voltage Vref1 is connected, comparator A2 and A3 output end connect the S ends and R ends of rest-set flip-flop, the Q of rest-set flip-flop respectively
End connection N type switch tube M4 grid, rest-set flip-flop and the Q non-end connections N type switch tube M6 grid；Rest-set flip-flop
Q ends export periodic square wave voltage signal V3 by non-inverting buffer.
In voltage-controlled mirror-image constant flow source 1021, changed by adjusting current sampling resistor Rsen and flow through switching tube M2 and M5
Electric current, its relation is：
In clock generating circuit 1022, switching tube M4 and M6 complementation shut-off, when M4 is turned off, constant-current source IM2C1 is filled
Electricity, electric capacity C1 both end voltages Vc1 is from the 0 time as Ton for rising to reference voltage V ref1, similarly electric capacity C2 both end voltages Vc2
From the 0 time as Toff for rising to reference voltage V ref1, so V3 frequency f_v3 and IM2Relation it is as follows：
Simultaneous formula (3) and (4) can be obtained：
It can be obtained from above formula, V3 frequency f_v3 and V2 amplitude meet linear ratio relation, without systematic error.Fig. 9 gives
Go out Vc1, Vc2 and V3 waveform, with reference to Fig. 4 as can be seen that when V2 changes, IM2And IM5Can real-time response, Vc1 or
The person Vc2 rate of rise can change at once, so as to change the Ton or Toff in next cycle, i.e. V3 and V2 time prolong
When be less than switch periods.
The periodic voltage signal V3 that power amplification circuit 103 is used to export voltage frequency conversioning circuit 102 is converted to
The current signal of identical frequency, and pass to primary side transmitting coil 104.Primary side transmitting coil 104 is used for the electric current that will be received
Signal is converted to magnetic field signal.
In the present embodiment, power amplification circuit 103 uses DC/DC converters, and the inductance of DC/DC converters is used as primary side
Transmitting coil 104.DC/DC converters are operated in pressure continuous mode and output no-load, the feedback reference of DC/DC converters and defeated
Enter supply voltage into fixed proportion, the periodicity that the clock frequency of DC/DC converters is exported by voltage frequency conversioning circuit 102 is believed
Number control.
Fig. 5 gives the physical circuit of DC/DC converters, and p-type switching tube M5 source electrode connection supply voltage Vcc, p-type is opened
The source electrode for closing pipe M5 is also connected with input filter capacitor Cin；P-type switching tube M5 drain electrode connection inductance L1 one end and N-type are opened
Pipe M6 drain electrode is closed, the inductance L1 other end is grounded through output capacitance Cout；Gathered by divider resistance on output capacitance Cout
Voltage and be input to operational transconductance amplifiers A8 negative input end, operational transconductance amplifiers A8 input termination benchmark electricity
Press Vref2；Operational transconductance amplifiers A8 output termination comparator A6 negative input end, and in operational transconductance amplifiers A8
Output end provided with ground connection filter capacitor；Circuit between supply voltage Vcc and N type switch tube M5 drain electrode is provided with electric current
Detect and converting unit, electric current when being opened for sampling switch pipe M5 is simultaneously converted to voltage V_Ipk, then input comparator A6
Positive input terminal；Comparator A6 output end connection rest-set flip-flop A5 R ends, rest-set flip-flop A5 S termination voltage frequency conversions
The voltage signal V3 of circuit output, rest-set flip-flop A5 Q ends output connect the control end of switching tube M5, M6 drive circuit, switching tube
M6 source ground.In the circuit, reference voltage V ref2 and supply voltage Vcc size is into fixed proportion relation, so when electricity
After the steady operation of road, the dutycycle D1 of the variator keeps constant.
The power amplification circuit is the buck converter for being operated in unloaded continuous state, its switching tube M5 open the moment by
Periodic voltage signal V3 rising edge control, switching tube M5 shut-off the moment by M5 current sampling signal V_Ipk voltages and
Operational transconductance amplifiers A8 output voltage Vcomp, which is handed over, cuts moment control.Due to being operated in unloaded continuous state, so primary side
The current waveform of transmitting coil 104 is the triangular wave that average value is 0, and its peak-to-peak value IL_pp is：
Secondary receiving coil 105 is used to receive magnetic field signal, and magnetic field signal is converted to the alternating voltage of identical frequency
Or current signal.The alternating voltage or current signal that frequency signal reception circuit 106 is used to export secondary receiving coil 105 enter
Row shaping, the voltage or electric current of output wave voltage signal V4, square wave voltage signal V4 frequency and secondary receiving coil 105 output
The frequency of signal is identical.
Secondary receiving coil 105 and frequency signal reception circuit 106 collectively form signal and received and shaping circuit, such as Fig. 6
Shown, the primary side of the output connection current transformer of secondary receiving coil 105, the secondary of current transformer is parallel with resistance R4.
Frequency signal reception circuit 106 also includes zero-crossing comparator A9 and A10, rest-set flip-flop A11, and zero-crossing comparator A10's is positive and negative defeated
Enter end connection resistance R4 two ends, the positive input terminal connection of zero-crossing comparator A9 negative input end and zero-crossing comparator A10, zero passage ratio
Positive input terminal ground connection compared with device A9, zero-crossing comparator A9 and A10 output end connects rest-set flip-flop A11 S ends and R ends respectively,
Rest-set flip-flop A11 Q ends as frequency signal reception circuit 106 output end, for exporting square wave voltage signal V4.
In signal reception and shaping circuit, the electric current I1 and I2 of primary side transmitting coil and secondary receiving coil are met with ShiShimonoseki
System：
In above formula, k12For primary side transmitting coil and the coefficient of coup of secondary receiving coil, it is between 0~1.
It can be obtained by formula (7), electric current I2 is identical with I1 frequencies, I2 amplitude can reduce, electric current as the coefficient of coup is reduced
Current signal is converted to voltage signal by transformer, and suitably increases its amplitude.Then it is whole by frequency signal reception circuit again
Square-wave waveform V4 is exported after shape, the frequency of whole process signal is constant, and specific waveform refers to Figure 10.
Frequency-voltage conversion circuit 107 is used to square wave voltage signal V4 being converted to DC level signal output.This implementation
In example, frequency-voltage conversion circuit 107 includes frequency duty cycle conversion circuit 1071 and RC low-pass filter circuits 1072.Frequency is accounted for
It is empty to be used to square wave voltage signal V4 being converted to dutycycle with the change of V4 frequencies by monostable flipflop than change-over circuit 1071
The square wave voltage signal VM of change, square wave voltage signal VM are identical with V4 frequency, square wave voltage signal VM dutycycle and square wave
Voltage signal V4 frequency is linearly proportional.RC low-pass filter circuits 1072 are used to be filtered square wave voltage signal VM
Direct current average voltage V5 is exported afterwards.
A kind of frequency-voltage conversion circuit is given in Fig. 7, wherein monostable flipflop A12 can export fixed pulse width
Square-wave signal, each V4 rising edge can trigger the square wave of a fixed pulse width, it is assumed that the fixed pulse width time is t1, then defeated
The relation for going out square-wave voltage VM dutycycle D2 and frequency f_v3 is：
It can be obtained from above formula, output square-wave voltage VM dutycycle D2 and frequency f_v3 meet linear ratio relation, do not prolong
When, also without systematic error.
R5 and C3 constitute low-pass filter circuit, if VM high level voltage accounting for for 5V, its output voltage V5 and VM
The empty relation than D2 is：
V5=5*D2=5*t1*f_v3 (9)
Specific oscillogram may be referred to accompanying drawing 11.
Simultaneous formula (1), (2), (5), (8), (9) can be obtained：
Linear ratio relation is met by a series of conversion measured signal S1 and output voltage V5, without systematic error.
For 107 filter circuit, its input voltage is the square wave after copped wave, when the dutycycle of square wave changes,
The response delay time of output voltage is about 5-6 times of filter circuit RC time constants.
Simulating, verifying is carried out to wireless feedback structure of the present utility model using the circuit of embodiment below.
Wherein measured signal is 4~8V, using voltage sampling circuit, R1=1900Kohm, R2=100Kohm；Voltage is frequently
In rate change-over circuit, Rsen=1Kohm, Vref1=2.5V, C1=C2=100pF；In signal transmission circuit, Vcc=5V,
Vout=2.5V, primary side transmitting coil sensibility reciprocal L1=2.2uH；Secondary receiving coil sensibility reciprocal L2=2.2uH, primary side transmitting coil and
The secondary receiving coil coefficient of coup takes k12=0.2；T1=300ns is taken in frequency duty cycle conversion circuit；Dutycycle voltage conversion
In circuit, output square wave high level is 5V, R5=1Mohm, C3=10pF.
Then V2 amplitude range is 0.2~0.4V, and f_v3=400K~800KHz can be obtained according to formula (5), can according to formula (8)
, the scope of corresponding dutycycle is D2=t1*f_v3=0.12~0.24, so final output voltage V5 scope is 5*
D=0.6~1.2V.
Figure 14 is given in the simulation results, figure as can be seen that when voltage S1_V to be measured changes to 8V from 4V, VM is frequently
Rate changes to 800KHz from 400KHz, and V5 average voltages change to 1.2V from 0.6V, and time delay is about 60us, are 6 times of R5*
C3 time constant, and the result of theoretical calculation match.
Embodiment 2：Different frequency-voltage conversion circuit schemes are employed from differing only in for embodiment 1, such as Fig. 8 institutes
Show.The circuit includes fixed constant-current source, electric capacity charging network, sampling hold circuit.Constant-current source Iref input connection power supply
Voltage vcc, it exports the positive pole for leading up to diode connection voltage source VS, separately leads up to switch S1 connection charging capacitors C4
One end；The other end of the negative pole and charging capacitor C4 that meet voltage source VS is grounded；Charging capacitor C4 two ends simultaneously even switch S2.
After sampling capacitance C5 tandem taps S3 and it is connected in charging capacitor C4 two ends, sampling capacitance C5 terminal voltage input operational amplifier
A13 in-phase input end, output capacitance C6 is connected between the output end of operational amplifier A 13 and ground.
The fixed constant-current source Iref of square wave voltage signal V4 controls that frequency signal reception circuit 106 is exported is by S1 to electric capacity
C4 is charged, and C4 voltage peak and the first square wave voltage signal V4 pulsewidth are directly proportional, and its relation is：
V_C4=Iref*Ton/C4=Iref*D1*f_v3/C4 (12)
Sampling hold circuit is constituted by switching S3 and electric capacity C5, when C5 capacitance is much smaller than C4, when S3 is turned on, C5 electricity
C4 capacitance voltages can be approximately equal to by holding voltage, when S3 is turned off, and C5 capacitance voltages keep constant；Then S2 is opened again, resets C4
Voltage, waits next cycle., can be with by a voltage follower A13 and electric capacity C5 in order to improve the ability of output current
A stable output voltage V5 is obtained, its amplitude is equal to V_C5.So V5 amplitude is equal to V_C4 voltage peak, it is expressed
Formula is：
Figure 12 gives switch S1, S2 and S3 switching sequence waveform, and Figure 15 gives electric capacity C4 and C5 voltage emulation
Waveform.It can be seen from fig. 15 that V_C4 voltage peak is proportional to S1 ON time, no more than one switch week of time delayses
Phase (1/f_v3), and from analysis before, S1 ON time is signal V3 ON time, itself and switching frequency f_
V3 is inversely proportional, without time delayses.It can thus be concluded that, V_C4 voltage and detected signal is linearly proportional, and no system is missed
No more than one switch periods (1/f_v3) of difference and time delayses.
The above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and
Retouching also should be regarded as protection domain of the present utility model.
Claims (6)
1. a kind of fast wireless feedback arrangement, it is characterised in that：Including the voltage cascaded successively or current sampling circuit (101),
Voltage frequency conversioning circuit (102), power amplification circuit (103), primary side transmitting coil (104), secondary receiving coil (105),
Frequency signal reception circuit (106), frequency-voltage conversion circuit (107)；Wherein：
The voltage or current sampling circuit (101) are used to sample to tested voltage or electric current, and the signal of sampling is turned
It is changed to the input voltage of the voltage frequency conversioning circuit (102)；
The voltage frequency conversioning circuit (102) is used to convert input voltage into cyclical signal, the cyclical signal
Frequency and the input voltage are linearly proportional；
The power amplification circuit (103) is used for the current signal that the cyclical signal is converted to identical frequency, and transmits
To the primary side transmitting coil (104)；
The primary side transmitting coil (104) is used to the current signal received being converted to magnetic field signal；
The secondary receiving coil (105) is used to receive the magnetic field signal, and the magnetic field signal is converted into identical frequency
Alternating voltage or current signal；
The frequency signal reception circuit (106) is used for the alternating voltage or electric current exported to the secondary receiving circuit (105)
Signal carries out exporting the first square wave voltage signal after shaping, and the frequency of first square wave voltage signal and the secondary receive line
The voltage of circle (105) output or the frequency of current signal are identical；
The frequency-voltage conversion circuit (107) is used to first square wave voltage signal being converted to DC level signal.
2. a kind of fast wireless feedback arrangement according to claim 1, it is characterised in that：The voltage frequency conversioning circuit
(102) voltage-controlled mirror-image constant flow source (1021) and clock generating circuit (1022) are included；The voltage-controlled mirror-image constant flow source
(1021) control signal is the output voltage of the voltage or current sampling circuit (101), the clock generating circuit
(1022) capacitance group and logic circuit are included；The voltage-controlled mirror-image constant flow source (1021) is under control signal control to described
Capacitance group carries out periodicity charging, and the periodicity that the logic circuit exports same frequency according to the capacitance group charge frequency is believed
Number.
3. a kind of fast wireless feedback arrangement according to claim 1 or 2, it is characterised in that：The power amplification circuit
(103) DC/DC converters are included, the inductance of the DC/DC converters is used as the primary side transmitting coil (104)；The DC/DC
Converter is operated in pressure continuous mode and output no-load, and the feedback references of the DC/DC converters and supply voltage are into fixation
Ratio, the cyclical signal control that the clock frequencies of the DC/DC converters is exported by the voltage frequency conversioning circuit (102)
System.
4. a kind of fast wireless feedback arrangement according to claim 3, it is characterised in that：The frequency-voltage conversion circuit
(107) frequency duty cycle conversion circuit (1071) and RC circuits (1072) are included；The frequency duty cycle conversion circuit (1071)
For first square wave voltage signal to be converted into dutycycle with first square wave voltage signal by monostable flipflop
Second square wave voltage signal of frequency change, second square wave voltage signal is identical with the frequency of the first square wave voltage signal,
The frequency of the dutycycle of second square wave voltage signal and first square wave voltage signal is linearly proportional；The RC
Circuit (1072) is used to export direct current average voltage after being filtered second square wave voltage signal.
5. a kind of fast wireless feedback arrangement according to claim 3, it is characterised in that：The frequency-voltage conversion circuit
(107) fixed constant-current source, electric capacity charging network, sampling hold circuit are included；Frequency signal reception circuit (106) output
First square wave voltage signal controls the fixed constant-current source to charge electric capacity charging network, and the electric capacity charging network fills
The pulsewidth of piezoelectric voltage peak value and first square wave voltage signal is directly proportional；The sampling hold circuit output voltage amplitude is equal to
The voltage signal of the charging voltage peak value.
6. a kind of fast wireless feedback arrangement according to claim 2, it is characterised in that：The voltage-controlled mirror-image constant flow source
(1021) first via current source and the second road current source are included, the capacitance group includes electric capacity C1 and electric capacity C2, the logic electricity
Road includes N type switch tube M4 and M6, comparator A2 and A3, rest-set flip-flop A4；The first via current source fills to the electric capacity C1
Electricity, second road current source charges to the electric capacity C2, and the N type switch tube M4 is connected in parallel on the electric capacity C1 two ends, the N
Type paralleled power switches are at the electric capacity C2 two ends, and the positive input terminal of the comparator A2 connects the drain electrode of the N type switch tube M4,
The drain electrode of the comparator A3 connections N type switch tube M6, the negative input end of the comparator A2 and A3 is all connected with benchmark electricity
Vref1 is pressed, the output end of the comparator A2 and A3 connects the S ends and R ends of the rest-set flip-flop A4, the rest-set flip-flop respectively
Q ends connect the grid of the N type switch tube M4, the non-ends of Q of the rest-set flip-flop A4 connect the grid of the N type switch tube M6
Pole, the Q ends of the rest-set flip-flop also export the cyclical signal by non-inverting buffer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621462987.XU CN206341041U (en) | 2016-12-28 | 2016-12-28 | A kind of fast wireless feedback arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621462987.XU CN206341041U (en) | 2016-12-28 | 2016-12-28 | A kind of fast wireless feedback arrangement |
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| Publication Number | Publication Date |
|---|---|
| CN206341041U true CN206341041U (en) | 2017-07-18 |
Family
ID=59303053
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621462987.XU Withdrawn - After Issue CN206341041U (en) | 2016-12-28 | 2016-12-28 | A kind of fast wireless feedback arrangement |
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| Country | Link |
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| CN (1) | CN206341041U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532972A (en) * | 2016-12-28 | 2017-03-22 | 南京航空航天大学 | Rapid wireless feedback structure |
| CN107947776A (en) * | 2017-12-06 | 2018-04-20 | 深圳奥特迅电力设备股份有限公司 | A kind of switch tube driving circuit of isolation |
-
2016
- 2016-12-28 CN CN201621462987.XU patent/CN206341041U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532972A (en) * | 2016-12-28 | 2017-03-22 | 南京航空航天大学 | Rapid wireless feedback structure |
| CN106532972B (en) * | 2016-12-28 | 2023-10-13 | 南京航空航天大学 | Quick wireless feedback structure |
| CN107947776A (en) * | 2017-12-06 | 2018-04-20 | 深圳奥特迅电力设备股份有限公司 | A kind of switch tube driving circuit of isolation |
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