CN105180975B - Voltage x current compatible type rate signal Acquisition Circuit - Google Patents
Voltage x current compatible type rate signal Acquisition Circuit Download PDFInfo
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Abstract
The invention provides a kind of voltage x current compatible type rate signal Acquisition Circuit, belong to electronic applications.Rate signal Acquisition Circuit includes the velocity sensor sampling circuit of two kinds of signal types of voltage and current, and the velocity sensor sampling circuit of voltage signal includes resistance R1, R2, R9 and triode VT1；The velocity sensor sampling circuit of current signal includes resistance R3, R4, R5, R6, R7, R8, R10, R11 and triode VT2, VT3 and VT4；Resistance R7, R8, R9 and R10 constitute the bleeder circuit of rate signal；Resistance R7, R8 and triode VT4 constitute current foldback circuit.The present invention, there is provided a kind of rate signal Acquisition Circuit for being capable of compatible voltage-type and current mode, significantly improves flexibility and the operability of system, reliability enhancing, with higher practical value using the velocity sensor of two kinds of signal types of voltage and current.
Description
Technical field
The present invention relates to a kind of rate signal Acquisition Circuit, and in particular to a kind of voltage x current compatible type rate signal collection
Circuit, belongs to electronic applications.
Background technology
Train operation monitoring and recording device (hereinafter referred to as supervising device) is important locomotive operation security device, its middling speed
Degree information is Back ground Information necessary to supervising device control, and rate signal Acquisition Circuit is the key of supervising device,
Vital effect is played in supervising device system, the accuracy and reliability of the collection of its rate signal directly influence monitoring
The performance of apparatus system.
The acquisition of past rate signal has first obtains code value by photoelectric encoder, rotary transformer or electromagnetic encoder,
Calculated again by processor and obtain rate signal, also had and directly gathered by velocity sensor, be such as based on Hall revolution speed transducer
Rate signal Acquisition Circuit, or but the acquisition device volume of above rate signal is larger, complicated, cost is higher,
Acquisition modes are unstable, and reliability is not high, it is therefore desirable to develop that a kind of reliability is high, simple to operate, lower-cost speed
Spend signal acquisition circuit.
The content of the invention
In order to overcome the shortcoming of above prior art, the invention provides a kind of collection of voltage x current compatible type rate signal
Circuit, the device circuit considers the velocity sensor of two kinds of signal types of voltage or electric current, the dual class of compatible voltage, electric current
Type sensor, it is highly reliable, simple to operate.
The technical solution adopted for the present invention to solve the technical problems is：
Voltage x current compatible type rate signal Acquisition Circuit, includes the velocity sensor of two kinds of signal types of voltage and current
Sampling circuit, the velocity sensor sampling circuit of voltage signal includes resistance R1, resistance R2, resistance R9 and NPN type triode
VT1；The velocity sensor sampling circuit of current signal includes resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance
R8, resistance R10, resistance R11 and PNP type triode VT2, NPN type triode VT3 and NPN type triode VT4；The resistance R7,
Resistance R8 and triode VT4 composition current foldback circuits；The resistance R7, resistance R8, resistance R9 and resistance R10 constitute speed letter
Number bleeder circuit；
Voltage sensor selection signal Us passes through resistance R2 connecting triodes VT1 base stage, triode VT1 emitter stage
The negative pole of connection speed sensor power supply, triode VT1 colelctor electrode connection resistance R1, resistance R1 other end connection speed
Sensor input signal is spent, input signal connects resistance R3, resistance R5, resistance R9 and triode VT2 emitter stage, resistance respectively
R9 other end connection rear class modulate circuit；
Amperometric sensor selection signal Is passes through resistance R11 connecting triodes VT3 base stage, triode VT3 transmitting
The negative pole of pole connection speed sensor power supply, triode VT3 colelctor electrode connects resistance R4, resistance R6, resistance R10 respectively
With triode VT2 colelctor electrode, the resistance R6 other end difference connecting triode VT2 base stage and resistance R5, resistance R5's is another
One end difference connecting triode VT2 emitter stage, resistance R3 and resistance R9, resistance R3 other end connection speed sensor is powered
The positive pole of power supply, triode VT2 colelctor electrode connects resistance R4, resistance R6 and resistance R10, resistance R4 other end connection respectively
The negative pole of velocity sensor power supply, resistance R10 connection rear class modulate circuits；
The colelctor electrode of the triode VT4 connects the resistance R11 and triode VT3 base stage respectively；Triode VT4's
Base stage connects resistance R7 and resistance R8, the negative pole of resistance R8 other end connection speed sensor power supply, resistance R7 respectively
Other end difference connecting triode VT2 colelctor electrode, resistance R4, resistance R6, triode VT3 colelctor electrode and resistance R10；Three
The negative pole of pole pipe VT4 emitter stage connection speed sensor power supply.
When velocity sensor is voltage-type, single-chip microcomputer control selections signal Us is high level and signal Is is low level,
Triode VT1 is turned on, and triode VT2 and triode VT3 cut-offs, current loop are cut off, now the velocity sensor sampling
Loop is voltage-type, and voltage signal passes through the bleeder circuit of the rate signal, is sent to rear class modulate circuit；
When velocity sensor is current mode, single-chip microcomputer control selections signal Us is low level and signal Is is high level,
Triode VT1 ends, triode VT2 and triode VT3 conductings, and now the velocity sensor sampling circuit is current mode, electricity
Stream signal is sampled by triode VT2 by resistance R4, is obtained voltage signal and is sent to rear class modulate circuit by resistance R10.
The rear class modulate circuit includes the first RC low-pass filter circuits, active low-pass filter, the 2nd RC LPFs
Circuit, the comparator circuit of positive feedback；
For voltage-type velocity sensor sampling circuit, the first RC low-pass filter circuits include electric capacity C1 and the resistance
R9；For current mode velocity sensor sampling circuit, the first RC low-pass filter circuits include the electric capacity C1 and resistance R10；
Active low-pass filter includes resistance R12, electric capacity C2 and operational amplifier IC1B, and resistance R12 connects electric capacity respectively
C2 positive pole and operational amplifier IC1B positive input terminal, electric capacity C2 positive pole concatenation operation amplifier IC1B positive input terminal,
Electric capacity C2 negative pole connects electric capacity C1 and ground connection respectively, and operational amplifier IC1B negative input end connects its output end, electricity respectively
Hinder R13, resistance R16, diode VD2 anode and diode VD3 negative electrode；
2nd RC low-pass filter circuits include resistance R16 and electric capacity C4, and resistance R16 connects electric capacity C4 positive pole and two respectively
Pole pipe VD4 anode, electric capacity C4 negative pole ground connection, signal passes through the RC low pass filters, obtains speed average voltage letter
Number, it is sent to CPU AD mouths；
The comparator circuit of positive feedback include rear class operational amplifier IC1A, diode VD2, diode VD3, resistance R13,
Resistance R14 and resistance R15, rear class operational amplifier IC1A positive input terminal connect resistance R13 and resistance R14, resistance R13 respectively
The other end connect respectively the output end of the operational amplifier IC1B, diode VD2 anode, diode VD3 negative electrode and
Resistance R16, resistance the R14 other end connect diode VD2 negative electrode, diode VD3 anode and resistance R15 respectively；Rear class
Operational amplifier IC1A negative input end connects electric capacity C3, diode VD1 anode, electric capacity C1 and resistance R12, electric capacity C3 respectively
The other end connect VD1 negative electrode；Rear class operational amplifier IC1A output end connects resistance R15's and diode VD5 respectively
Negative electrode, diode VD5 anode connection resistance R17, the resistance R15 other end connects diode VD2 negative electrode and two poles respectively
Pipe VD3 anode, diode VD2 and diode VD3 series connection, pass through the IC1A of the comparator of the positive feedback so that speed
Frequency signal is compared with speed average voltage signal, and output level is sent to CPU seizure mouthful by speed in frequency signal.
Further, the cut-off frequency of the RC filter circuits is 10KHz.
Further, the speed in frequency signal is obtained by diode-coupled, and its high level voltage is 5V.
In the current foldback circuit, when triode VT4 base voltages reach 0.7V, triode VT4 conductings, triode
VT2 and triode VT3 cut-offs.
The invention has the advantages that using the velocity sensors of two kinds of signal types of voltage or electric current, there is provided one
Kind it is capable of the rate signal Acquisition Circuit of compatible voltage-type and current mode, significantly improves flexibility and the operability of system, can
By property enhancing, with higher practical value.
Brief description of the drawings
Fig. 1 is rate signal Acquisition Circuit figure of the present invention, wherein, 1- speed sensor interfaces, 2- power interfaces, 3- monolithics
Machine interface；
Fig. 2 is voltage sensor signal sampling oscillogram；
Fig. 3 is amperometric sensor signal sampling oscillogram.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As shown in figure 1, rate signal Acquisition Circuit includes three interfaces, respectively speed sensor interface 1, power interface
2 and interface microcontroller 3；Positive pole PWR, the velocity sensor that speed sensor interface 1 has velocity sensor power supply are powered electricity
With this circuit altogether, and voltage is 8~30V of direct current, covering by the negative pole GND and velocity sensor input signal Si g_in, PWR in source
Common velocity sensor operating voltage range；Interface microcontroller 3 has speed in frequency signal Sig_Frq, speed average electricity
Press signal Sig_AD, voltage sensor selection signal Us and amperometric sensor selection signal Is.
Rate signal sample circuit considers the velocity sensor of two kinds of signal types of voltage or electric current, wherein, Is is used for
The turn-on and turn-off of control electric current type velocity sensor sampling circuit, Us is used for control voltage type velocity sensor sampling circuit
Turn-on and turn-off.
Resistance R1, R2, R9 and triode VT1 constitute the velocity sensor sampling circuit of voltage signal；Resistance R3, R4, R5,
R6, R7, R8, R10, R11 and triode VT2, VT3, VT4 constitute the velocity sensor sampling circuit of current signal, wherein, resistance
R7, R8 and triode VT4 are current foldback circuits；Resistance R7, resistance R8, resistance R9 and resistance R10 constitute point of rate signal
Volt circuit.
Voltage sensor selection signal Us passes through resistance R2 connection NPN type triodes VT1 base stage, NPN type triode
The negative pole GND of VT1 emitter stage connection speed sensor power supply, NPN type triode VT1 colelctor electrode connection resistance R1,
The resistance R1 other end connection speed sensor input signal Sig_in, Sig_in connects resistance R3, resistance R5, resistance R9 respectively
With PNP type triode VT2 emitter stage, resistance R9 other end connection rear class modulate circuit；
Amperometric sensor selection signal Is passes through resistance R11 connection NPN type triodes VT3 base stage, NPN type triode
The negative pole GND of VT3 emitter stage connection speed sensor power supply, NPN type triode VT3 colelctor electrode connects resistance respectively
R4, resistance R6, resistance R10 and PNP type triode VT2 colelctor electrode, the resistance R6 other end connect PNP type triode respectively
VT2 base stage and resistance R5, the resistance R5 other end connects PNP type triode VT2 emitter stage, resistance R3 and resistance respectively
The positive pole PWR of R9, resistance R3 other end connection speed sensor power supply, PNP type triode VT2 colelctor electrode connects respectively
Connecting resistance R4, resistance R6 and resistance R10, the negative pole GND of resistance R4 other end connection speed sensor power supply, resistance
R10 connection rear class modulate circuits；
1) when velocity sensor is voltage-type, speed sensor interface has three lines：PWR, Sig_in and GND；Us is
High level, Is is low level, and triode VT1 is in the conduction state, and triode VT2, VT3 and VT4 are all in cut-off state；Its
In, resistance R1 is build-out resistor, and the velocity sensor sampling circuit of current signal is cut off, voltage signal by resistance R9,
After R10, R7, R8 partial pressure, rear class modulate circuit is sent to.
2) when velocity sensor is current mode, speed sensor interface only has PWR and Sig_in both threads；Us is low electricity
Flat, Is is high level, and triode VT1 is in cut-off state, and triode VT2 and VT3 passes through all in conducting state, current signal
Triode VT2 is sampled by resistance R4, is obtained voltage signal and is sent to rear class modulate circuit by resistance R10.
In the velocity sensor sampling circuit of current signal, R4 is sampling resistor, if R4=250 Ω, with 7mA/14mA
Exemplified by current signal (Is), it is assumed that dutycycle is 50%, then sampled voltage is calculated as follows：
Vsig_in=Is × R4 (1)
As Is=7mA, Vsig_in=1.75V；
As Is=14mA, Vsig_in=3.50V；
Dutycycle is 50%, therefore average value is：
Sig_AD=(1.75+3.50)/2V=2.625V (2)
Current foldback circuit includes resistance R7, R8 and triode VT4, and triode VT4 colelctor electrode connects resistance R11 respectively
With triode VT3 base stage；Triode VT4 base stage connects resistance R7 and resistance R8, resistance R8 other end connection speed respectively
Spend the negative pole GND of sensor power supply, the resistance R7 other end difference connecting triode VT2 colelctor electrode, resistance R4, resistance
R6, triode VT3 colelctor electrode and resistance R10；The negative pole of triode VT4 emitter stage connection speed sensor power supply
GND。
When current mode velocity sensor sampling circuit excessively stream, when triode VT4 base voltages reach 0.7V, VT4 conductings make
Triode VT3 cut-offs are obtained, and then cause triode VT2 cut-offs, turn-off current velocity sensor sampling circuit, so as to play protection
The effect of current loop.
Wherein, the correlation computations of overcurrent protection are as follows：
Triode VT2 collector voltages：
Vc=Vbe × (R7+R8)/R8 (3)
So, overcurrent protection electric current is：
Is (MAX)=Vc/R4=Vbe × (R7+R8)/(R8*R4) (4)
R7, R8 resistance value appropriate by choosing, can set the overcurrent protection electric current Is (MAX) of needs.
In addition, in Fig. 1, rear class modulate circuit includes the first RC low-pass filter circuits, active low-pass filter, the 2nd RC
Low-pass filter circuit, the comparator circuit of positive feedback；Its operation principle：For voltage-type velocity sensor sampling circuit, electric capacity
C1 and resistance R9 constitutes the first RC low-pass filter circuits；For current mode velocity sensor sampling circuit, electric capacity C1 and resistance R10
The first RC low-pass filter circuits are constituted, this grade of filtering is that, for High-frequency Interference, rail vehicle velocity sensor output frequency is general
Less than 10KHz, therefore RC filter circuit cut-off frequencies are designed as 10KHz.
Resistance R12, electric capacity C2 and operational amplifier IC1B composition active low-pass filters, resistance R12 connect electric capacity respectively
C2 positive pole, operational amplifier IC1B positive input terminal, electric capacity C2 positive pole concatenation operation amplifier IC1B positive input terminal, electricity
The negative pole for holding C2 connects electric capacity C1 and ground connection respectively；Operational amplifier IC1B negative input end connects its output end, resistance respectively
R13, resistance R16, the negative electrode of diode VD2 anode and diode 3, therefore cut-off frequency filters rate signal also than larger
Into direct current, as the input signal of rear class operational amplifier, and pass through the 2nd RC low pass filters (resistance R16 and electric capacity again
C4 is constituted, and resistance R16 connects electric capacity C4 positive pole and diode VD4 anode, electric capacity C4 negative pole ground connection respectively), obtain it
Average value Sig_AD, be sent to CPU AD mouths；The RC low pass filters that resistance R16 and electric capacity C4 is constituted, in order to prevent rear class from transporting
Calculate amplifier circuit feedback signal and interference is produced to Sig_AD, therefore cut-off frequency is than larger.
The comparator circuit of positive feedback include rear class operational amplifier IC1A, diode VD2, diode VD3, resistance R13,
Resistance R14 and resistance R15, rear class operational amplifier IC1A positive input terminal connect resistance R13 and resistance R14, resistance R13 respectively
The other end connect respectively the output end of the operational amplifier IC1B, diode VD2 anode, diode VD3 negative electrode and
Resistance R16, resistance the R14 other end connect diode VD2 negative electrode, diode VD3 anode and resistance R15 respectively；Rear class
Operational amplifier IC1A negative input end connects electric capacity C3, diode VD1 anode, electric capacity C1 and resistance R12, electric capacity C3 respectively
The other end connect VD1 negative electrode；Rear class operational amplifier IC1A output end connects resistance R15's and diode VD5 respectively
Negative electrode, diode VD5 anode connection resistance R17, the resistance R15 other end connects diode VD2 negative electrode and two poles respectively
Pipe VD3 anode, passes through the comparator of positive feedback so that the frequency signal of speed is compared with its average value, output level
The voltage obtained by diode-coupled is sent to CPU seizure mouthful for 5V speed in frequency signal Sig_Frq.
Two kinds of mode of operations of voltage-type, current mode speed acquisition circuit are imitated using Multisim10.1 softwares
True checking.
First, voltage-type mode of operation：
(1) simulated conditions：
1st, the power supply of+5V and+15V connections relevant voltage, Us meets+5V, Is ground connection GND；
2nd, 100Hz, 50% dutycycle are applied between input signal Si g_in and GND, a height of 15V of logic, logic low are
0V voltage-type frequency signal is as pumping signal, analog voltage type velocity sensor；
3rd, speed in frequency signal Sig_Frq and speed average voltage signal Sig_AD ripple is observed using dual trace oscilloscope
Shape.
(2) simulation result：
Fig. 2 is voltage sensor signal sampling oscillogram, and the square-wave signal of triangle described point is that single-chip microcomputer can be known
Other DC5V speed in frequency signal, what is do not marked is the speed average voltage signal that filtering is obtained, and Sig_AD is single-chip microcomputer
The galvanic current pressure signal that analog-to-digital conversion interface can sample, has reached expected design effect.
2nd, current mode mode of operation：
(1) simulated conditions：
1st, the power supply of+5V and+15V connections relevant voltage, Us ground connection GND, Is meet+5V；
2nd, 100Hz, 50% dutycycle are applied between input signal Si g_in and GND, a height of 14mA of logic, logic low are
7mA current mode frequency signal is as pumping signal, analog current type velocity sensor；
3rd, speed in frequency signal Sig_Frq and speed average voltage signal Sig_AD ripple is observed using dual trace oscilloscope
Shape.
(2) simulation result：
Fig. 3 is amperometric sensor signal sampling oscillogram, and the square-wave signal of triangle described point is that single-chip microcomputer can be known
Other DC5V speed in frequency signal, what is do not marked is the speed average voltage signal that filtering is obtained, and Sig_AD is single-chip microcomputer
The galvanic current pressure signal that analog-to-digital conversion interface can sample, has reached expected design effect.
By Fig. 2 and Fig. 3, voltage-type mode of operation simulation result is similar with current mode mode of operation simulated effect,
The sensor that this circuit is demonstrated to voltage-type, current mode both interface types is compatible, applicable.
Claims (6)
1. voltage x current compatible type rate signal Acquisition Circuit, it is characterised in that rate signal Acquisition Circuit includes voltage and electricity
The velocity sensor sampling circuit of two kinds of signal types is flowed, the velocity sensor sampling circuit of voltage signal includes resistance R1, electricity
Hinder R2, resistance R9 and NPN type triode VT1；The velocity sensor sampling circuit of current signal includes resistance R3, resistance R4, electricity
Hinder R5, resistance R6, resistance R7, resistance R8, resistance R10, resistance R11 and PNP type triode VT2, NPN type triode VT3 and NPN
Type triode VT4；The resistance R7, resistance R8 and triode VT4 composition current foldback circuits；The resistance R7, resistance R8, electricity
Hinder the bleeder circuit that R9 and resistance R10 constitutes rate signal；
Voltage sensor selection signal Us passes through resistance R2 connecting triodes VT1 base stage, triode VT1 emitter stage connection
The negative pole of velocity sensor power supply, triode VT1 colelctor electrode connection resistance R1, resistance R1 other end connection speed is passed
Sensor input signal, input signal connects resistance R3, resistance R5, resistance R9 and triode VT2 emitter stage respectively, resistance R9's
The other end connects rear class modulate circuit；
Amperometric sensor selection signal Is passes through resistance R11 connecting triodes VT3 base stage, triode VT3 emitter stage company
The negative pole of velocity sensor power supply is connect, triode VT3 colelctor electrode connects resistance R4, resistance R6, resistance R10 and three respectively
Pole pipe VT2 colelctor electrode, the resistance R6 other end difference connecting triode VT2 base stage and resistance R5, the resistance R5 other end
Difference connecting triode VT2 emitter stage, resistance R3 and resistance R9, resistance R3 other end connection speed sensor power supply
Positive pole, triode VT2 colelctor electrode connects resistance R4, resistance R6 and resistance R10, resistance R4 other end connection speed respectively
The negative pole of sensor power supply, resistance R10 connection rear class modulate circuits；
The colelctor electrode of the triode VT4 connects the resistance R11 and triode VT3 base stage respectively；Triode VT4 base stage
Respectively connect resistance R7 and resistance R8, the negative pole of resistance R8 other end connection speed sensor power supply, resistance R7's is another
One end difference connecting triode VT2 colelctor electrode, resistance R4, resistance R6, triode VT3 colelctor electrode and resistance R10；Triode
The negative pole of VT4 emitter stage connection speed sensor power supply.
2. voltage x current compatible type rate signal Acquisition Circuit as claimed in claim 1, it is characterised in that work as velocity sensor
During for voltage-type, single-chip microcomputer control selections signal Us is high level and signal Is is low level, triode VT1 conductings, triode
VT2 and triode VT3 cut-offs, current loop is cut off, and now the velocity sensor sampling circuit is voltage-type, voltage signal
By the bleeder circuit of the rate signal, rear class modulate circuit is sent to；
When velocity sensor is current mode, single-chip microcomputer control selections signal Us is low level and signal Is is high level, three poles
Pipe VT1 ends, triode VT2 and triode VT3 conductings, and now the velocity sensor sampling circuit is current mode, electric current letter
Number sampled by resistance R4 by triode VT2, obtain voltage signal and rear class modulate circuit is sent to by resistance R10.
3. voltage x current compatible type rate signal Acquisition Circuit as claimed in claim 1 or 2, it is characterised in that the rear class
Modulate circuit includes the first RC low-pass filter circuits, active low-pass filter, the 2nd RC low-pass filter circuits, the comparison of positive feedback
Device circuit；
For voltage-type velocity sensor sampling circuit, the first RC low-pass filter circuits include the electric capacity C1 and resistance R9；It is right
In current mode velocity sensor sampling circuit, the first RC low-pass filter circuits include the electric capacity C1 and resistance R10；
Active low-pass filter includes resistance R12, electric capacity C2 and operational amplifier IC1B, and resistance R12 connects electric capacity C2's respectively
The positive input terminal of positive pole and operational amplifier IC1B, electric capacity C2 positive pole concatenation operation amplifier IC1B positive input terminal, electric capacity
C2 negative pole connects electric capacity C1 and ground connection respectively, and operational amplifier IC1B negative input end connects its output end, resistance respectively
R13, resistance R16, diode VD2 anode and diode VD3 negative electrode；
2nd RC low-pass filter circuits include resistance R16 and electric capacity C4, and resistance R16 connects electric capacity C4 positive pole and diode respectively
VD4 anode, electric capacity C4 negative pole ground connection, signal passes through the 2nd RC low-pass filter circuits, obtains speed average voltage
Signal, is sent to CPU AD mouths；
The comparator circuit of positive feedback includes rear class operational amplifier IC1A, diode VD2, diode VD3, resistance R13, resistance
R14 and resistance R15, rear class operational amplifier IC1A positive input terminal connect resistance R13 and resistance R14 respectively, and resistance R13's is another
One end connects the output end of the operational amplifier IC1B, diode VD2 anode, diode VD3 negative electrode and resistance respectively
R16, resistance the R14 other end connect diode VD2 negative electrode, diode VD3 anode and resistance R15 respectively；Rear class computing
Amplifier IC1A negative input end connects electric capacity C3, diode VD1 anode, electric capacity C1 and resistance R12 respectively, and electric capacity C3's is another
One end connects VD1 negative electrode；Rear class operational amplifier IC1A output end connects resistance R15 and diode VD5 negative electrode respectively,
Diode VD5 anode connection resistance R17, the resistance R15 other end connects diode VD2 negative electrode and diode VD3 respectively
Anode, diode VD2 and diode VD3 series connection pass through the IC1A of the comparator of the positive feedback so that the frequency of speed letter
Number it is compared with speed average voltage signal, output level is sent to CPU seizure mouthful by speed in frequency signal.
4. voltage x current compatible type rate signal Acquisition Circuit as claimed in claim 3, it is characterised in that the first RC is low
The cut-off frequency of bandpass filter circuit is 10KHz.
5. voltage x current compatible type rate signal Acquisition Circuit as claimed in claim 3, it is characterised in that the speed in frequency
Signal is obtained by diode-coupled, and its high level voltage is 5V.
6. voltage x current compatible type rate signal Acquisition Circuit as claimed in claim 1, it is characterised in that the overcurrent protection
In circuit, when triode VT4 base voltages reach 0.7V, triode VT4 conductings, triode VT2 and triode VT3 end.
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| CN111983343A (en) * | 2020-07-22 | 2020-11-24 | 宁波燕清汽车技术有限公司 | Current type wheel speed sensor acquisition circuit |
| CN112764367A (en) * | 2020-12-08 | 2021-05-07 | 清华大学 | Universal sensor signal acquisition circuit topological structure and use method |
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| Single currentsensor technique in the DC link of three-phase PWM-VS inverters：a review and a novel solution;F. Blaabjerg;《Browse Journals & Magazines》;20020806;第33卷(第5期);第1241-1253页 * |
| 多功能数据采集的研制;张震;《中国优秀硕士学位论文全文数据库 信息科技辑》;20120215(第02期);第21-24页 * |
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| CN105180975A (en) | 2015-12-23 |
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