CN209497449U - A kind of conversion circuit of pulse signal and current signal - Google Patents
A kind of conversion circuit of pulse signal and current signal Download PDFInfo
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- CN209497449U CN209497449U CN201920154697.6U CN201920154697U CN209497449U CN 209497449 U CN209497449 U CN 209497449U CN 201920154697 U CN201920154697 U CN 201920154697U CN 209497449 U CN209497449 U CN 209497449U
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Abstract
The utility model discloses the conversion circuits that a kind of pulse signal is converted to current signal, including pulse signal circuit, pulse voltage conversion circuit, signal amplification circuit, voltage-current converter circuit, the pulse signal circuit is used for output pulse signal, the pulse voltage conversion circuit is used to the pulse signal being converted into voltage signal, the signal amplification circuit is used to amplify the voltage signal processing, and the voltage-current converter circuit is used to the amplified voltage signal being converted into current signal；The output end of the pulse signal circuit connects the input terminal of the pulse voltage conversion circuit, the input terminal of the output end connection signal amplifying circuit of the pulse voltage conversion circuit, the output end of the signal amplification circuit connects the input terminal of the voltage-current converter circuit, the utility model realizes the current signal that the pulse signal for detecting sensor is converted to 4-20mA, Adjustment precision is high, strong antijamming capability.
Description
Technical field
The utility model relates to signal switch technology fields, are converted into current signal more particularly, to a kind of pulse signal
Conversion circuit.
Background technique
Currently, sensor using more and more extensive, type is also more and more, sensor output be electric current letter
Number, sensor output be pulse signal, in this way, in the signal of receiving sensor external circuit just need for difference
Sensor output signal carry out different designs, seriously limit the use scope of sensor, also limit external circuit
Application range needs to make different sensors while can be attached on an external circuit to different sensings
The output signal of device is converted, and such as in certain occasions, needs to detect multiple signals, and the signal of this multiple and different type uses
Different types of sensor, what such as a sensor exported is pulse signal, and the output of another sensor is current signal,
How to allow and both sensor output signals while being applicable in the same external circuit, is current urgent problem to be solved.
Summary of the invention
The purpose of the utility model is to provide the conversion circuits that a kind of pulse signal is converted to current signal, first by pulse
Signal is converted to voltage signal, and amplifies to voltage signal, and amplified voltage signal is then converted to current signal,
Realize that same external circuit adapts to different types of sensor or different types of sensor exports same type of signal.
The foregoing invention purpose of the utility model has the technical scheme that
A kind of pulse signal is converted to the conversion circuit of current signal, including pulse signal circuit, pulse voltage conversion electricity
Road, signal amplification circuit, voltage-current converter circuit, the pulse signal circuit are used for output pulse signal, the pulse electricity
Voltage conversion circuit is used to for the pulse signal being converted into voltage signal, and the signal amplification circuit is used for the voltage signal
Processing is amplified, the voltage-current converter circuit is used to the amplified voltage signal being converted into current signal；Institute
The output end for stating pulse signal circuit connects the input terminal of the pulse voltage conversion circuit, the pulse voltage conversion circuit
Output end connects the input terminal of the signal amplification circuit, and the output end of the signal amplification circuit connects the voltage and current and turns
Change the input terminal of circuit.
The utility model is further arranged to: the pulse voltage conversion circuit include voltage follower circuit, detecting circuit,
Voltage conversion circuit, low-pass filter circuit, the output end of the input terminal connection pulse signal circuit of the voltage follower circuit, institute
The output end for stating voltage follower circuit connects the input terminal of the detecting circuit, and the output end of the detecting circuit connects the electricity
The input terminal of voltage conversion circuit, the output end of the voltage conversion circuit connects the input terminal of the low-pass filter circuit, described
The output end of low-pass filter circuit connects the input terminal of the signal amplification circuit.
The utility model is further arranged to: the pulse voltage conversion circuit includes pulse voltage conversion chip.
The utility model is further arranged to: the signal amplification circuit includes negative voltage transition positive electricity volt circuit, adjustment
Circuit, the negative voltage transition positive electricity volt circuit are used to for negative voltage signal being converted into positive voltage signal, and the adjustment circuit is used
In the corresponding relationship of adjustment frequency input signal and output electric current.
The utility model is further arranged to: the negative voltage transition positive electricity volt circuit includes the first operational amplifier,
Negative input end connects negative reference voltage by first resistor, connects the output of the pulse voltage conversion circuit by second resistance
End, by connecting its output end after third potentiometer and the tandem compound of 3rd resistor, its negative input end and its output end it
Between be also connected with first capacitor；The output end of first operational amplifier connects one end of the 4th resistance, the other end of the 4th resistance
Connect one end of the second capacitor, the other end ground connection of the second capacitor；The positive input terminal of first operational amplifier passes through the 5th resistance
Ground connection.
The utility model is further arranged to: the adjustment circuit includes the voltage-stablizer of two series connections, steady in series connection
The both ends of depressor combination are connected in parallel the second potentiometer, and one end of the second potentiometer connects the first positive voltage by the 6th resistance
Source, the other end connect the first negative voltage source by the 7th resistance, and the adjustable side of the second potentiometer after the 8th resistance by being connected to
The negative input end of first operational amplifier, two series voltage regulators combination tie point at be grounded.
The utility model is further arranged to: the voltage-current converter circuit, for voltage signal to be converted into and electricity
Press the current signal of size variation in direct ratio.
The utility model is further arranged to: the voltage-current converter circuit further includes current foldback circuit, the mistake
Stream protection circuit is used for the shutdown output when output electric current is excessive.
The utility model is further arranged to: the voltage-current converter circuit includes second operational amplifier, triode.
The positive input terminal of the second operational amplifier connects the output end of the signal amplification circuit, and negative input end passes through the 9th electricity
Resistance ground connection, the output end for connecting the voltage-current converter circuit.Second operational amplifier output end is connected by the tenth resistance
The base stage of triode, the collector of the triode connect the first positive supply, and emitter connects voltage electricity by eleventh resistor
Flow the output end of conversion circuit.
The utility model is further arranged to: current foldback circuit includes metal-oxide-semiconductor, described in the grid connection of the metal-oxide-semiconductor
The emitter of triode, drain electrode connect the base stage of the triode, and connect second operational amplifier by eleventh resistor
Output end.Its source electrode is connected to the emitter of triode by twelfth resistor.
Compared with prior art, the advantageous effects of the utility model are as follows:
1. the utility model realizes the unification of sensor output signal by the way that pulse signal is converted to current signal.
2. the utility model is isolated by setting pulse voltage conversion circuit, realization with signal source, anti-interference energy is improved
Power.
3. the utility model improves signal accuracy by setting amplifying circuit and voltage-current converter circuit.
Detailed description of the invention
Fig. 1 is the electrical block diagram of a specific embodiment of the utility model.
Fig. 2 is the structural schematic diagram of the pulse voltage conversion circuit of a specific embodiment of the utility model.
Fig. 3 is that the signal of a specific embodiment of the utility model follows the structural schematic diagram of circuit.
Fig. 4 is the structural schematic diagram of the detecting circuit of a specific embodiment of the utility model.
Fig. 5 is the structural schematic diagram of the pulse voltage conversion circuit of a specific embodiment of the utility model.
Fig. 6 is the structural schematic diagram of the low-pass filter circuit of a specific embodiment of the utility model.
Fig. 7 is the structural schematic diagram of the negative voltage transition positive electricity volt circuit of a specific embodiment of the utility model.
Fig. 8 is the structural schematic diagram of the adjustment circuit of a specific embodiment of the utility model.
Fig. 9 is the structural schematic diagram of the voltage-current converter circuit of a specific embodiment of the utility model.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
Referring to Fig.1, the conversion circuit of current signal, including pulse letter are converted into for a kind of pulse signal disclosed by the invention
Number circuit, pulse voltage conversion circuit, signal amplification circuit, voltage-current converter circuit, pulse signal circuit is for exporting arteries and veins
Signal Fin is rushed, pulse voltage conversion circuit is used to pulse signal Fin being converted into voltage signal VA, and signal amplification circuit is used for
Processing is amplified to voltage signal VA, voltage-current converter circuit is used to the amplified voltage signal VB being converted into electricity
Flow signal；Pulse signal circuit output end connection pulse voltage conversion circuit input terminal, pulse voltage conversion circuit it is defeated
The input terminal of outlet connection signal amplifying circuit, the input of the output end connection voltage-current converter circuit of signal amplification circuit
End.
In one specific embodiment of the utility model, as shown in Fig. 2, pulse voltage conversion circuit includes voltage follow electricity
The input terminal connection pulse signal circuit of road, detecting circuit, voltage conversion circuit, low-pass filter circuit, voltage follower circuit is defeated
Outlet, return pulse signal Fin, the input terminal of the output end connection detecting circuit of voltage follower circuit, the output of detecting circuit
The input terminal of end connection pulse voltage conversion circuit, the input terminal of the output end connection low-pass filter circuit of voltage conversion circuit,
The output end of the low-pass filter circuit connects the output end Va of the pulse signal circuit, output voltage signal VA.
In one specific embodiment of the utility model, as shown in figure 3, voltage follower circuit include biasing resistor R1, R2,
Amplifier U1, the one end biasing resistor R1 connect power Vcc, and the other end connects the positive input terminal of biasing resistor R2 and amplifier U1,
The other end of biasing resistor R2 is grounded, and pulse signal circuit output end connects the positive input terminal of amplifier U1.Voltage follower circuit
For carrying out following processing to pulse signal Fin, input/output signal is isolated, anti-interference ability is improved.
As shown in figure 4, detecting circuit includes detection resistance R3, R4 and detection capacitor C1, one end connection of detection resistance R3
The output terminals A of voltage follower circuit, the other end connect one end of detection resistance R4, detection capacitor C1, and detection resistance R4's is another
End ground connection, the input terminal of the other end B connection voltage conversion circuit of detection capacitor C1；Detecting circuit is used to carry out pulse signal
Detection isolates out flip-flop.
As shown in figure 5, the voltage conversion circuit uses pulse voltage conversion chip, pulse voltage conversion chip is 8PIN
Structure, the 8th foot meet second source+Vcc2, and the 7th foot connects one end of resistance R6, RX, the second electricity of another termination of resistance R6
The other end of source+Vcc2, RX are grounded；Its 6th foot connects the output end B of detecting circuit, connects one end of resistance R5, resistance R5's
Another termination second source+Vcc2；Its 5th foot connects one end of one end of resistance Rt, capacitor Ct, another termination of resistance Rt
The other end of second source+Vcc2, capacitor Ct are grounded；Its 3rd, 4 foot ground connection；Its 2nd foot passes through resistance RS, potentiometer RP1
It is grounded after tandem compound；Its 1st foot connects the output end C of one end of capacitor C2, voltage conversion circuit, another termination of capacitor C2
Ground.Voltage conversion circuit is used to pulse signal being converted into voltage signal.
As shown in fig. 6, the input terminal of the output end C connection low-pass filter circuit of voltage conversion circuit, low-pass filter circuit
Including comparator U3B, positive input terminal ground connection, negative input end meets the output end C of voltage conversion circuit by resistance R7, defeated
The output end Va for terminating pulse voltage conversion circuit out, connects capacitor C3, pulse voltage between negative input end and its output end
Feedback resistance RF is connected between the output end of the output end C and comparator U3B of conversion circuit, low-pass filter circuit is used for conversion
Voltage signal afterwards is filtered, and filters out radio-frequency component, output voltage signal VA.
In the present embodiment, pulse voltage conversion circuit is used to convert -2V-0V for the pulse signal that frequency is 0-1KHz
Voltage signal.
In one specific embodiment of the utility model, the signal amplification circuit includes negative voltage transition positive electricity piezoelectricity
Road, adjustment circuit, the negative voltage transition positive electricity volt circuit are used to negative voltage signal being converted into positive voltage signal, the adjustment
Circuit is used to adjust frequency input signal and export the corresponding relationship of electric current, and the input terminal of the adjustment circuit connects the negative electricity
The output end of pressure conversion positive electricity volt circuit.
In one specific embodiment of the utility model, as shown in fig. 7, negative voltage transition positive electricity volt circuit includes that operation is put
The negative input end f of big device U3A, operational amplifier U3A pass through the negative reference voltage source of resistance R13 connection, pass through resistance R8 connection arteries and veins
The output end Va of voltage conversion circuit is rushed, by connecting its output end after the tandem compound of potentiometer RP3 and resistance R14, negative
Capacitor C4 is also connected between input terminal f and output end, output end connects one end of resistance R15, and the other end of resistance R15 connects
Connect one end of capacitor C5 and the other end ground connection of the output end Vb of signal amplification circuit, capacitor C5；Operational amplifier U3A's is just defeated
Enter end to be grounded by resistance R12.Negative reference voltage is -2.5V in the present embodiment.
As shown in figure 8, adjustment circuit includes voltage-stablizer U4, U5 of two series connections, in series voltage regulator U4, U5 group
The both ends of conjunction be connected in parallel one end of the second potentiometer RP2, the second potentiometer RP2 by the first positive voltage source of resistance R10 connection+
Vcc1, the other end are passed through after resistance R9 by the first negative voltage source of resistance R11 connection-Vcc1, the adjustable side of the second potentiometer RP2
It is connected to the negative input end f of operational amplifier U3A, is grounded at the tie point of series voltage regulator U4, U5 combination.
Signal amplification circuit in the present embodiment, in the biased electrical of the negative input end setting -2.5V of operational amplifier U3A
Source, by adjusting RP2 come realize when frequency input signal be 0 when, output signal electric current be 4mA.
In one specific embodiment of the utility model, as shown in figure 9, voltage-current converter circuit is used for voltage signal
It is converted into the current signal with voltage variation in direct ratio, in the present embodiment, for positive voltage signal to be converted to 4-20mA
Current signal.
Voltage-current converter circuit includes operational amplifier U6, and the positive input terminal of operational amplifier U6 connects the signal and puts
The output end Vb of big circuit, negative input end are grounded by resistance R16, connect the output end of the voltage-current converter circuit,
Its output end passes through the base stage of resistance R17 connecting triode Q1, and the collector of triode Q1 meets the first positive voltage source+Vcc1,
Emitter connects the output end of voltage-current converter circuit by resistance R18, R19.
In the present embodiment, voltage-current converter circuit further includes current foldback circuit, for when output electric current is excessive
Shutdown output, current foldback circuit include metal-oxide-semiconductor Q2, the emitter of the grid connecting triode Q1 of metal-oxide-semiconductor Q2, drain electrode company
The base stage of the triode Q1 is connect, source electrode is connected to the emitter of triode Q1 by resistance R18, then connects by resistance R19
Connect the output end of voltage-current converter circuit.
The implementation principle of the present embodiment are as follows: first by conversion circuit and pulse signal detection, for improving anti-interference ability,
Again by pulse voltage conversion circuit, negative voltage signal is converted by pulse signal, then pass through negative voltage transition positive electricity volt circuit,
Negative voltage signal is converted into positive voltage signal, then positive voltage signal is converted into the electric current with voltage swing variation in direct ratio
Signal output.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this
Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it
It is interior.
Claims (10)
1. the conversion circuit that a kind of pulse signal is converted to current signal, it is characterised in that: including pulse signal circuit, pulse electricity
Voltage conversion circuit, signal amplification circuit, voltage-current converter circuit, the pulse signal circuit are used for output pulse signal, institute
Pulse voltage conversion circuit is stated for the pulse signal to be converted into voltage signal, the signal amplification circuit is used for described
Voltage signal amplifies processing, and the voltage-current converter circuit is used to the amplified voltage signal being converted into electric current
Signal；The output end of the pulse signal circuit connects the input terminal of the pulse voltage conversion circuit, and the pulse voltage turns
The output end for changing circuit connects the input terminal of the signal amplification circuit, and the output end of the signal amplification circuit connects the electricity
The input terminal of current voltage conversion circuit.
2. conversion circuit according to claim 1, it is characterised in that: the pulse voltage conversion circuit includes voltage follow electricity
Road, detecting circuit, voltage conversion circuit, low-pass filter circuit, the input terminal connection pulse signal electricity of the voltage follower circuit
The output end on road, the output end of the voltage follower circuit connect the input terminal of the detecting circuit, the detecting circuit it is defeated
Outlet connects the input terminal of the voltage conversion circuit, and the output end of the voltage conversion circuit connects the low-pass filter circuit
Input terminal, the output end of the low-pass filter circuit connects the input terminal of the signal amplification circuit.
3. conversion circuit according to claim 2, it is characterised in that: the voltage conversion circuit includes pulse voltage conversion core
Piece.
4. conversion circuit according to claim 1, it is characterised in that: the signal amplification circuit includes negative voltage transition positive electricity
Volt circuit, adjustment circuit, the negative voltage transition positive electricity volt circuit is used to negative voltage signal being converted into positive voltage signal, described
Adjustment circuit is for adjusting frequency input signal and exporting the corresponding relationship of electric current, described in the input terminal connection of the adjustment circuit
The output end of negative voltage transition positive electricity volt circuit.
5. conversion circuit according to claim 4, it is characterised in that: the negative voltage transition positive electricity volt circuit includes the first fortune
Amplifier is calculated, negative input end connects negative reference voltage by first resistor, the pulse voltage is connected by second resistance turn
The output end of circuit is changed, by connecting its output end after third potentiometer and the tandem compound of 3rd resistor, in its negative input end
First capacitor is also connected between its output end；One end of output end the 4th resistance of connection of first operational amplifier, the 4th
The other end of resistance connects one end of the second capacitor, the other end ground connection of the second capacitor；The positive input terminal of first operational amplifier
Pass through the 5th resistance eutral grounding.
6. conversion circuit according to claim 4, it is characterised in that: the adjustment circuit includes the pressure stabilizing of two series connections
Device is connected in parallel the second potentiometer at the both ends of series voltage regulator combination, and one end of the second potentiometer is connected by the 6th resistance
First positive voltage source, the other end connect the first negative voltage source by the 7th resistance, and the adjustable side of the second potentiometer passes through the 8th electricity
It is connected to the negative input end of the first operational amplifier after resistance, is grounded at the tie point of two series voltage regulators combination.
7. conversion circuit according to claim 1, it is characterised in that: the voltage-current converter circuit, for voltage to be believed
Number it is converted into the current signal with voltage swing variation in direct ratio.
8. conversion circuit according to claim 1, it is characterised in that: the voltage-current converter circuit further includes overcurrent protection
Circuit, the current foldback circuit are used for the shutdown output when output electric current is excessive.
9. conversion circuit according to claim 7, it is characterised in that: the voltage-current converter circuit includes that the second operation is put
Big device, triode, the positive input terminal of the second operational amplifier connect the output end of the signal amplification circuit, negative input
End is passed through by the 9th resistance eutral grounding, the output end of the connection voltage-current converter circuit, second operational amplifier output end
The base stage of tenth resistance connecting triode, the collector of the triode connect the first positive supply, and emitter passes through the 11st, ten
The output end of two resistance connection voltage-current converter circuit.
10. conversion circuit according to claim 9, it is characterised in that: current foldback circuit includes metal-oxide-semiconductor, the metal-oxide-semiconductor
Grid connects the emitter of the triode, and drain electrode connects the base stage of the triode, and passes through the tenth resistance connection second
The output end of operational amplifier, source electrode are connected to the emitter of triode by eleventh resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920154697.6U CN209497449U (en) | 2019-01-29 | 2019-01-29 | A kind of conversion circuit of pulse signal and current signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920154697.6U CN209497449U (en) | 2019-01-29 | 2019-01-29 | A kind of conversion circuit of pulse signal and current signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209497449U true CN209497449U (en) | 2019-10-15 |
Family
ID=68156227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920154697.6U Active CN209497449U (en) | 2019-01-29 | 2019-01-29 | A kind of conversion circuit of pulse signal and current signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209497449U (en) |
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2019
- 2019-01-29 CN CN201920154697.6U patent/CN209497449U/en active Active
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