CN110413035A - A kind of intelligent signal isolator circuit - Google Patents
A kind of intelligent signal isolator circuit Download PDFInfo
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- CN110413035A CN110413035A CN201910823750.1A CN201910823750A CN110413035A CN 110413035 A CN110413035 A CN 110413035A CN 201910823750 A CN201910823750 A CN 201910823750A CN 110413035 A CN110413035 A CN 110413035A
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- 238000012545 processing Methods 0.000 claims abstract description 37
- 238000002955 isolation Methods 0.000 claims abstract description 27
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- 230000001629 suppression Effects 0.000 claims description 34
- 238000001914 filtration Methods 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 20
- 238000011084 recovery Methods 0.000 claims description 12
- 238000004804 winding Methods 0.000 claims description 12
- 102100036894 Protein patched homolog 2 Human genes 0.000 claims description 9
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- 230000008878 coupling Effects 0.000 claims description 6
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
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- 238000012544 monitoring process Methods 0.000 description 4
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- 230000002265 prevention Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017509—Interface arrangements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Radar, Positioning & Navigation (AREA)
- Electromagnetism (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Control Of Voltage And Current In General (AREA)
- Amplifiers (AREA)
Abstract
The present invention relates to a kind of intelligent signal isolator circuits; including power protecting circuit, power circuit, signal processing circuit, main control circuit and isolation pick-up output circuit; power supply is electrically connected with power protecting circuit; power protecting circuit is electrically connected with power circuit; power circuit respectively with signal processing circuit, main control circuit and be isolated pick-up output circuit electrical connection; external perimysium reference current signal accesses signal processing circuit; signal processing circuit is electrically connected with main control circuit, and main control circuit is electrically connected with pick-up output circuit is isolated.The present invention carries out current limliting by standard current signal of the signal processing circuit to input, limit can be protected; and voltage signal is converted by standard current signal; then it exports after amplifying processing to main control circuit; and it is exported by isolation pick-up output circuit; it is really mutually isolated between realizing power supply, outputting and inputting; the anti-interference ability of product is substantially increased, it is easy for installation, it is low in cost.
Description
Technical field
The present invention relates to electronic circuit technology field more particularly to a kind of intelligent signal isolator circuits.
Background technique
In complicated industry spot, the acquisition transmission of the parameters such as pressure, temperature, liquid level, flow, signal isolator is must not
It can lack, and must be transmitted by the guard grating with explosion prevention function in the signal of danger zone, certain guard grating is also
One kind of signal isolator, as its name suggests, the most important condition is isolation to signal isolator, i.e. working power, input signal, output letter
Must be mutually isolated between number, three isolation are commonly called as, the power unit, input in order to improve the anti-interference ability of product, in product
Part all devises various protection circuits, and the mode combined using Phototube Coupling and electromagnetic isolation, finally by software
Platform software calibration.The signal isolator of most domestic be all based on electromagnetic isolation, by the zero point of multiturn potentiometer and
Full scale adjusts to realize that the isolation to 4~20mA of standard input signal DC is transmitted, and also has the intelligent isolating transmitter of small part,
But in the adverse circumstances for having large-size machine or large-size variable-frequency device, often anti-interference ability is inadequate, the signal of import brand every
It is 4-5 times expensive, being all domestic brand from device.
Summary of the invention
The technical problem to be solved by the present invention is to solve the above shortcomings of the prior art and to provide a kind of isolation of intelligent signal
Device circuit.
The technical scheme to solve the above technical problems is that a kind of intelligent signal isolator circuit, including power supply
Circuit, power circuit, signal processing circuit, main control circuit and isolation pick-up output circuit are protected, power supply and the power supply are protected
Protection circuit electrical connection, the power protecting circuit is electrically connected with the power circuit, the power circuit respectively with the letter
Number processing circuit, main control circuit and isolation pick-up output circuit electrical connection, external perimysium reference current signal access at the signal
Manage circuit, the signal processing circuit is electrically connected with the main control circuit, the main control circuit with described that pick-up is isolated is defeated
Circuit is electrically connected out, the external output signal of the isolation pick-up output circuit.
The beneficial effects of the present invention are: in the embodiment of the present invention, by the power protecting circuit to power circuit into
Row protection, and be respectively that the signal processing circuit and main control circuit are powered by power circuit, the signal processing electricity
Road carries out current limliting to the standard current signal of input, limit can be protected, and convert voltage signal for standard current signal, then into
It exports after row enhanced processing to the main control circuit, and is exported by the isolation pick-up output circuit, realize power supply, input
It is really mutually isolated between output, the anti-interference ability of product is substantially increased, entire circuit is small in size, and it is easy for installation, and
And it is low in cost.
Based on the above technical solution, the present invention can also be improved as follows:
Further, the power protecting circuit includes self-recovery fuse PTC, Transient Suppression Diode TVS, common mode inductance
L1 and diode D1, positive pole are electrically connected by the cathode of the self-recovery fuse PTC and the Transient Suppression Diode TVS
It connects, the anode of the Transient Suppression Diode TVS is electrically connected with power ground, the cathode of the Transient Suppression Diode TVS and institute
State one end electrical connection of the one of winding of common mode inductance L1, the corresponding termination power of another winding of the common mode inductance L1
Ground, the other end of mono- winding of common mode inductance L1 are electrically connected with the anode of the diode D1, and the diode D1's is negative
Pole is electrically connected with the power circuit, the other end ground connection of another winding of the common mode inductance L1.
The beneficial effect of above-mentioned further scheme is: fast when can pass by stream online by the self-recovery fuse PTC
Quick-break is opened, and energy self- recoverage can provide voltage punching by the Transient Suppression Diode TVS to normally state afterwards
Excessively high surge protection is hit, surge impact overtension is avoided, damages the power circuit, can be risen by the diode D1
It is acted on to reverse connecting protection, guarantees not damage product when the positive and negative anodes of power supply are reversed, product cisco unity malfunction, when wiring restores just
Chang Shineng is worked normally.
Further, the power protecting circuit further includes resistance capaciting absorpting circuit, the resistance capaciting absorpting circuit includes resistance R0
It is connected in parallel between the cathode and anode of the Transient Suppression Diode TVS with after capacitor C0, the resistance R0 and capacitor C0 series connection.
The beneficial effect of above-mentioned further scheme is: can be believed the voltage of power input by the resistance capaciting absorpting circuit
It number is filtered, removes the clutter ingredient in signal, guarantee the stability of output signal, anti-interference ability, again not can be improved
Influence the dielectric strength of product.
Further, the power circuit includes resistance R1, resistance R2, resistance R3, capacitor C1, capacitor C2, capacitor C3, capacitor
C4, diode D2, switch controller U2, diode D3, optocoupler U3, diode D4, transformer T, current rectifying and wave filtering circuit and pressure stabilizing
Filter circuit, one end of the primary coil of transformer T cathode with the cathode of the diode D1 and diode D2 respectively
Electrical connection, the positive of the diode D2 are parallel with the resistance R1 between the other end of the primary coil of the transformer T
With capacitor C2, the other end of the primary coil of the transformer T is electrically connected with the drain electrode of the switch controller U2, the switch
The source electrode of controller U2 is grounded, and the capacitor C1 is connected electrically in the cathode of the diode D1 and the source electrode of switch controller U2
Between, the capacitor C4 is connected electrically between the source electrode and control terminal of the switch controller U2, the feedback line of the transformer T
One end of circle is electrically connected with the anode of the diode D3, and the cathode of the diode D3 passes through the capacitor C3 and the transformation
The other end of the feedback coil of device T is electrically connected, the other end ground connection of the feedback coil of the transformer T, the diode D3's
Cathode is electrically connected with the collector of the optocoupler U3, the control terminal electricity of the emitter of the optocoupler U3 and the switch controller U2
Connection, the electrical connection corresponding with two input terminals of the current rectifying and wave filtering circuit respectively of the both ends of the secondary coil of the transformer T,
Two output ends of the current rectifying and wave filtering circuit and two input terminals of the filter circuit of pressure-stabilizing it is corresponding electrical connection, the optocoupler
The anode of U3 is electrically connected by the resistance R2 with an output end of the current rectifying and wave filtering circuit, the cathode of the optocoupler U3 and
The cathode of the diode D4 is electrically connected, the another output electricity of the anode and the current rectifying and wave filtering circuit of the diode D4
Connection is electrically connected between the cathode and anode of the optocoupler U3 by the resistance R3, and the filter circuit of pressure-stabilizing has first
Output end, second output terminal, third output end and the 4th output end, and the first output end and third of the filter circuit of pressure-stabilizing
Output end is electrically connected with the power input of the signal amplification circuit respectively, the second output terminal of the filter circuit of pressure-stabilizing with
The power input of the main control circuit is electrically connected, the 4th output end of the filter circuit of pressure-stabilizing with described that pick-up is isolated is defeated
The power input electrical connection of circuit out.
The beneficial effect of above-mentioned further scheme is: passing through the first output end of the power circuit, second output terminal,
Three output ends and the 4th go out outlet export different voltage respectively, for the signal processing circuit, main control circuit and isolation
Pick-up output circuit provides the power supply to match respectively, guarantees that entire circuit works normally.
Further, the signal processing circuit include limit can circuit, resistance R14, resistance R15, resistance R16, resistance R17,
Resistance R18, resistance R19, resistance R20, capacitor C26, capacitor C27, capacitor C28, capacitor C29 and operational amplifier U8, standard electric
It flows signal and accesses the limit energy circuit, an output end of the limit energy circuit and the non-inverting input terminal of the operational amplifier U8
Between it is in sequential series have the resistance R14 and resistance R16, be parallel between the resistance R14 and the common end and ground of resistance R16
The resistance R15 and capacitor C26, the another output ground connection of the limit energy circuit, the operational amplifier U8's is same mutually defeated
Enter end to be grounded by the capacitor C27, the inverting input terminal of the operational amplifier U8 is grounded by the resistance R17, described
The resistance R18 is electrically connected between the inverting input terminal and output end of operational amplifier U8, the operational amplifier U8 is just
Power input and the electrical connection corresponding with the first output end of the power circuit and third output end respectively of negative supply input terminal,
It is in sequential series between the output end and ground of the operational amplifier U8 to have the resistance R19, capacitor C28, capacitor C29 and resistance
The common end of R20, the resistance R19 and capacitor C28 are inputted as the positive signal of positive signal output end and the main control circuit
The common end of end electrical connection, the common end grounding of the capacitor C28 and capacitor C29, the capacitor C29 and resistance R20 are as negative
Signal output end is electrically connected with the negative signal input terminal of the main control circuit.
The beneficial effect of above-mentioned further scheme is: by the signal processing circuit, can believe the normalized current
It number is converted into voltage signal, and by operational amplifier U8 enhanced processing, and exported to the main control circuit, by main control electricity
Road is according to the voltage signal output pwm signal after enhanced processing.
Further, the limit energy circuit includes diode D10, diode D11, Transient Suppression Diode TVS2, transient state suppression
Diode TVS3 and self-recovery fuse PTC2 processed, standard current signal access the anode of the diode D10, the diode
The anode of the cathode of D10 and diode D11 are electrically connected, the cathode of the diode D11 respectively with the Transient Suppression Diode
The cathode electrical connection of the cathode and Transient Suppression Diode TVS3 of TVS2, the anode and transient state of the Transient Suppression Diode TVS2
The anode of diode TVS3 is inhibited to be grounded as another output, the cathode and the self- recoverage of the diode D11 is protected
One end of dangerous silk PTC2 is electrically connected, and the other end of the self-recovery fuse PTC2 is as an output end and the resistance R14
One end electrical connection.
The beneficial effect of above-mentioned further scheme is: by the limit energy circuit can when moment have big electric current or
When high voltage, the double-deck surge protection avoids generating spark because of overtension, electric current excessive moment, cause an explosion accident.
Further, the isolation pick-up output circuit includes resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, electricity
Hinder R10, resistance R11, resistance R12, resistance R13, capacitor C23, capacitor C24, capacitor C25, optocoupler U5, zener diode D8, touching
Device U6, operational amplifier U7, triode Q5 and zener diode D9 are sent out, the signal output end of the main control circuit passes through described
Resistance R5 is electrically connected with the anode of the optocoupler U5, and the collector of the minus earth of the optocoupler U5, the optocoupler U5 passes through institute
It states resistance R6 to be electrically connected with the anode of the zener diode D9, the cathode of the diode D9 and the 4th of the power circuit
Output end electrical connection, the emitter of the optocoupler U5 by resistance R7 ground connection, the emitter of the optocoupler U5 respectively with institute
State the ground terminal electrical connection of the anode and trigger U6 of zener diode D8, the cathode of the zener diode D8 and the pressure stabilizing
The anode electrical connection of diode D9, is electrically connected between the reference pole and cathode of the zener diode D8 by the resistance R8,
Be electrically connected with the capacitor C23 between the anode and cathode of the zener diode D8, the collector of the optocoupler U5 with it is described
The input terminal of trigger U6 is electrically connected, and the power input of the trigger U6 and the anode of the zener diode D9 are electrically connected
It connects, it is in sequential series between the output end of the trigger U6 and the non-inverting input terminal of the operational amplifier U7 to have the resistance R9
Pass through the anode of the capacitor C24 and the zener diode D9 with the common end of resistance R10, the resistance R9 and resistance R10
Electrical connection, the anode electricity that the non-inverting input terminal of the operational amplifier U7 passes through the capacitor C25 and zener diode D9
Connection, it is in sequential series between the inverting input terminal of the operational amplifier U7 and the anode of the zener diode D9 to have the electricity
R12 and resistance R13 is hindered, and the common end of the resistance R12 and resistance R13 is electrically connected with the emitter of the triode Q5, institute
The base stage for stating triode Q5 is electrically connected by the resistance R11 with the output end of the operational amplifier U7, the triode Q5
Collector as positive signal output end, the collector of the triode Q5 is electrically connected with the anode of external impressed current table mA, external
The cathode of ammeter mA is grounded as negative signal output end, the cathode of external impressed current table mA.
The beneficial effect of above-mentioned further scheme is: can be exported the main control single channel by the optocoupler U5
Pwm signal carries out Phototube Coupling, then carries out shaping to pwm signal by the trigger U6, exports regular square-wave signal, so
Second level RC filtering processing is carried out by the resistance R9, capacitor C24, resistance R10 and capacitor C25 afterwards, is converted into stable direct current
Voltage, then voltage signal is converted to by the operational amplifier U7 current signal of standard, then externally output, is realized defeated
Enter the isolation of output.
Further, the intelligent signal isolator circuit further includes communicating circuit, the communicating circuit respectively with it is described
Main control circuit and exterior terminal electrical connection, the communicating circuit are electrically connected with the second output terminal of the power circuit.
The beneficial effect of above-mentioned further scheme is: can directly be led to PLC, host computer interface by the communicating circuit
News, can be read directly the isolation signals value of actual monitoring.Facilitate teledata output and the prison of DCS industrial control system
Control.
Detailed description of the invention
Fig. 1 is intelligent signal isolator electrical block diagram of the invention；
Fig. 2 is the circuit diagram of power protecting circuit and power circuit of the invention；
Fig. 3 is the circuit diagram of signal processing circuit of the invention；
Fig. 4 is the circuit diagram of pick-up spacing output circuit of the invention；
Fig. 5 is the circuit diagram of main control circuit and communicating circuit of the invention.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
As shown in Figure 1, a kind of intelligent signal isolator circuit, including power protecting circuit, power circuit, signal processing electricity
Road, main control circuit and isolation pick-up output circuit, power supply are electrically connected with the power protecting circuit, the power protecting circuit
With being electrically connected for the power circuit, the power circuit respectively with the signal processing circuit, main control circuit and change is isolated
Send output circuit to be electrically connected, external perimysium reference current signal accesses the signal processing circuit, the signal processing circuit with it is described
The electrical connection of pick-up output circuit, the isolation pick-up output is isolated with described in main control circuit electrical connection, the main control circuit
The external output signal of circuit.
Intelligent signal isolator circuit of the invention protects power circuit by the power protecting circuit, and
It is respectively the signal processing circuit and main control circuit power supply, mark of the signal processing circuit to input by power circuit
Quasi- current signal carries out current limliting, limit can be protected, and convert voltage signal for standard current signal, after then amplifying processing
Output is exported to the main control circuit, and by the isolation pick-up output circuit, realize power supply, output and input between very
It is just mutually isolated, the anti-interference ability of product is substantially increased, entire circuit is small in size, easy for installation and low in cost.
As shown in Fig. 2, the power protecting circuit includes self- recoverage in one or more embodiments provided by the invention
Fuse PTC, Transient Suppression Diode TVS, common mode inductance L1 and diode D1, positive pole by the fuse PTC with
The cathode of the Transient Suppression Diode TVS is electrically connected, and the anode of the Transient Suppression Diode TVS is electrically connected with power ground,
The cathode of the Transient Suppression Diode TVS is electrically connected with one end of the one of winding of common mode inductance L1, the common mode
The corresponding termination power ground of another winding of inductance L1, the other end and the diode of mono- winding of common mode inductance L1
The anode electrical connection of D1, the cathode of the diode D1 is electrically connected with the power circuit, the common mode inductance L1 another around
The other end ground connection of group.In the present invention, the power protecting circuit is designed using wide power, and Vcc supply voltage range is DC
18-72V, voltage rating are DC 24V, are quickly disconnected when can pass by stream online by the self-recovery fuse PTC, and
Energy self- recoverage can provide voltge surge excessively high wave to normally state by the Transient Suppression Diode TVS afterwards
Protection is gushed, surge impact overtension is avoided, damages the power circuit, reverse connecting protection can be played by the diode D1
Effect, guarantees not damage product when the positive and negative anodes of power supply are reversed, product cisco unity malfunction, can be normal when wiring restores normal
Work.
Preferably, in one or more embodiments provided by the invention, the power protecting circuit further includes that capacitance-resistance is inhaled
Receive circuit, the resistance capaciting absorpting circuit include be connected in parallel on after resistance R0 and capacitor C0, the resistance R0 and capacitor C0 series connection it is described
Between the cathode and anode of Transient Suppression Diode TVS.The voltage of power input can be believed by the resistance capaciting absorpting circuit
It number is filtered, removes the clutter ingredient in signal, guarantee the stability of output signal, anti-interference ability, again not can be improved
Influence the dielectric strength of product.
As shown in Fig. 2, the power circuit includes resistance R1, electricity in one or more embodiments provided by the invention
Hinder R2, resistance R3, capacitor C1, capacitor C2, capacitor C3, capacitor C4, diode D2, switch controller U2, diode D3, optocoupler
U3, diode D4, transformer T, current rectifying and wave filtering circuit and filter circuit of pressure-stabilizing, one end point of the primary coil of the transformer T
It is not electrically connected with the cathode of the cathode of the diode D1 and diode D2, anode and the transformer T of the diode D2
Primary coil the other end between be parallel with the resistance R1 and capacitor C2, the other end of the primary coil of the transformer T
It is electrically connected with the drain electrode of the switch controller U2, the source electrode ground connection of the switch controller U2, and the capacitor C1 is electrically connected
Between the cathode of the diode D1 and the source electrode of switch controller U2, the capacitor C4 is connected electrically in the switch controller
Between the source electrode and control terminal of U2, one end of the feedback coil of the transformer T is electrically connected with the anode of the diode D3, institute
The cathode for stating diode D3 is electrically connected by the capacitor C3 with the other end of the feedback coil of the transformer T, the transformation
The other end of the feedback coil of device T is grounded, and the cathode of the diode D3 is electrically connected with the collector of the optocoupler U3, the light
The emitter of coupling U3 is electrically connected with the control terminal of the switch controller U2, the both ends difference of the secondary coil of the transformer T
Electrical connection corresponding with two input terminals of the current rectifying and wave filtering circuit, two output ends of the current rectifying and wave filtering circuit and described steady
The corresponding electrical connection of two input terminals of filters pressing wave circuit, the anode of the optocoupler U3 pass through the resistance R2 and the rectifying and wave-filtering
One output end of circuit is electrically connected, and the cathode of the optocoupler U3 is electrically connected with the cathode of the diode D4, the diode
The anode of D4 is electrically connected with the another output of the current rectifying and wave filtering circuit, is passed through between the cathode and anode of the optocoupler U3
The resistance R3 electrical connection, the filter circuit of pressure-stabilizing have the first output end, second output terminal, third output end and the 4th defeated
Outlet, and the first output end of the filter circuit of pressure-stabilizing and third output end are defeated with the power supply of the signal amplification circuit respectively
Enter end electrical connection, the second output terminal of the filter circuit of pressure-stabilizing is electrically connected with the power input of the main control circuit, institute
The 4th output end for stating filter circuit of pressure-stabilizing is electrically connected with the power input that pick-up output circuit is isolated.Pass through the electricity
The first output end, second output terminal, third output end and the 4th output end of source circuit export different voltage respectively, for institute
It states signal processing circuit, main control circuit and isolation pick-up output circuit and the power supply to match is provided respectively, guarantee entire circuit
It works normally.
Here, the switch controller U2 uses the three end DC-DC pwm switch of model TOP414G, transformer T
Feedback winding output voltage by diode D3 and capacitor C3 rectifying and wave-filtering, then pass through optocoupler U3 Phototube Coupling after, make
Used in the 4 foot control terminals of U2, to be charged early period by capacitor C4, switch controller U2 self-excitation starting of oscillation realizes that direct current becomes exchange conversion,
AC signal is isolated to secondary coil by the primary of transformer T, and the AC signal of secondary coil passes through diode D5 and electricity again
Hold C5 and be converted into direct current signal, optocoupler U3 DC voltage moment breakdown diode D4, is connected.Then the leakage of switch controller U2
5 foot of pole and source electrode 1-2-3 foot, the conducting of 6-7-8 foot, switch controller U2 oscillatory work.
Specifically, the current rectifying and wave filtering circuit and filter circuit of pressure-stabilizing include three tunnels, and correspond electrical connection.Its
Middle first via current rectifying and wave filtering circuit includes diode D7, capacitor C14, capacitor C15 and inductance L3, first via filter circuit of pressure-stabilizing packet
Include voltage-stabiliser tube Q4, capacitor C16 and capacitor C17.Similarly the second road current rectifying and wave filtering circuit includes diode D5, capacitor C5, capacitor C6
With inductance L2, the second road filter circuit of pressure-stabilizing includes voltage-stabiliser tube Q1, voltage-stabiliser tube Q2, capacitor C7, capacitor C8 and capacitor C9, third road
Current rectifying and wave filtering circuit includes diode D6, capacitor C10 and capacitor C11, and third road filter circuit of pressure-stabilizing includes capacitor C12, capacitor
C13 and voltage-stabiliser tube Q3.Specific connection type as shown in Fig. 2, and be this field common connection type, it is no longer superfluous here
It states.
As shown in figure 3, the signal processing circuit includes that limit can electricity in one or more embodiments provided by the invention
Road, resistance R14, resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, capacitor C26, capacitor C27, electricity
Hold C28, capacitor C29 and operational amplifier U8, standard current signal accesses the limit energy circuit, and one of the limit energy circuit is defeated
It is in sequential series between outlet and the non-inverting input terminal of the operational amplifier U8 to have the resistance R14 and resistance R16, the resistance
The resistance R15 and capacitor C26 are parallel between R14 and the common end and ground of resistance R16, another of the limit energy circuit is defeated
The non-inverting input terminal of outlet ground connection, the operational amplifier U8 is grounded by the capacitor C27, and the operational amplifier U8's is anti-
Phase input terminal is grounded by the resistance R17, is electrically connected between the inverting input terminal and output end of the operational amplifier U8
The positive supply input terminal and negative supply input terminal of the resistance R18, the operational amplifier U8 respectively with the power circuit
The corresponding electrical connection of first output end and third output end, between the output end and ground of the operational amplifier U8 it is in sequential series
The common end for stating resistance R19, capacitor C28, capacitor C29 and resistance R20, the resistance R19 and capacitor C28 is exported as positive signal
End is electrically connected with the positive signal input terminal of the main control circuit, and the common end grounding of the capacitor C28 and capacitor C29 are described
The common end of capacitor C29 and resistance R20 are electrically connected as negative signal output end with the negative signal input terminal of the main control circuit.
By the signal processing circuit, it can be converted into voltage signal to the standard current signal, and pass through operational amplifier U8
Enhanced processing, and export to the main control circuit, by main control circuit according to the voltage signal output PWM letter after enhanced processing
Number.
Preferably, in one or more embodiments provided by the invention, the limit energy circuit includes diode D10, two
Pole pipe D11, Transient Suppression Diode TVS2, Transient Suppression Diode TVS3 and self-recovery fuse PTC2, standard current signal
The anode of the diode D10 is accessed, the cathode of the diode D10 is electrically connected with the anode of diode D11, the diode
The cathode of D11 is electrically connected with the cathode of the cathode of the Transient Suppression Diode TVS2 and Transient Suppression Diode TVS3 respectively,
The anode of the Transient Suppression Diode TVS2 and the anode of Transient Suppression Diode TVS3 are grounded as another output,
The cathode of the diode D11 is electrically connected with one end of the self-recovery fuse PTC2, the self-recovery fuse PTC2's
The other end is electrically connected as an output end with one end of the resistance R14.Can have when moment by the limit energy circuit
When big electric current or high voltage, the double-deck surge protection, avoid generating because of overtension, electric current excessive moment spark, cause it is quick-fried
Fried accident.
As shown in figure 4, the isolation pick-up output circuit includes electricity in one or more embodiments provided by the invention
Hinder R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, capacitor C23, capacitor
C24, capacitor C25, optocoupler U5, zener diode D8, trigger U6, operational amplifier U7, triode Q5 and zener diode D9,
The signal output end of the main control circuit is electrically connected by the resistance R5 with the anode of the optocoupler U5, the optocoupler U5's
The collector of minus earth, the optocoupler U5 is electrically connected by the resistance R6 with the anode of the zener diode D9, described
The cathode of diode D9 is electrically connected with the 4th output end of the power circuit, and the emitter of the optocoupler U5 passes through the resistance
R7 ground connection, ground terminal of the emitter of the optocoupler U5 respectively with the anode of the zener diode D8 and trigger U6 are electrically connected
It connects, the cathode of the zener diode D8 is electrically connected with the anode of the zener diode D9, the ginseng of the zener diode D8
It examines and is electrically connected between pole and cathode by the resistance R8, is electrically connected between the anode and cathode of the zener diode D8
Capacitor C23 is stated, the collector of the optocoupler U5 is electrically connected with the input terminal of the trigger U6, and the power supply of the trigger U6 is defeated
Enter end to be electrically connected with the anode of the zener diode D9, the output end of the trigger U6 is same with the operational amplifier U7's
It is in sequential series between phase input terminal to have the common end of the resistance R9 and resistance R10, the resistance R9 and resistance R10 described in
Capacitor C24 is electrically connected with the anode of the zener diode D9, and the non-inverting input terminal of the operational amplifier U7 passes through the electricity
Hold C25 to be electrically connected with the anode of the zener diode D9, the inverting input terminal of the operational amplifier U7 and the pressure stabilizing two
It is in sequential series between the anode of pole pipe D9 to have the resistance R12 and resistance R13, and the common end of the resistance R12 and resistance R13
It is electrically connected with the emitter of the triode Q5, the base stage of the triode Q5 passes through the resistance R11 and the operation amplifier
The output end of device U7 is electrically connected, and the collector of the triode Q5 is as positive signal output end, the collector of the triode Q5
Be electrically connected with the anode of external impressed current table mA, the cathode of external impressed current table mA as negative signal output end, external impressed current table mA's
Cathode ground connection.Phototube Coupling is carried out by the pwm signal that the optocoupler U5 can export the main control single channel, then passes through institute
It states trigger U6 and shaping is carried out to pwm signal, export regular square-wave signal, then pass through the resistance R9, capacitor C24, electricity
It hinders R10 and capacitor C25 and carries out second level RC filtering processing, be converted into steady dc voltage, then pass through the operational amplifier U7
Voltage signal is converted to the current signal of standard, then externally output, realizes the isolation of input and output.Here it is possible to pass through
Adjustment is the duty ratio of PWM square-wave signal to adjust output current signal size, exports DC4-20mA standard current signal.
In the embodiment of the present invention, microprocessor U1 of the main control circuit using low-voltage, micro energy lose, model
MSP430AFE253, low supply voltage 1.8-3.6V can work, and the entire consumption electric current under super low-power consumption, activation pattern only has
0.22mA inside has 3 tunnels to have 24 A/D converters of difference programmable gain amplifier input, is able to satisfy DC current completely
It is converted into being input to the A/D conversion of U1 mouthfuls of voltage signals of microprocessor, while there is SBW on-line debugging interface, emulation is facilitated to adjust
Examination.The CPU and peripheral circuit are as shown in Figure 5.
As shown in Figure 5, it is preferable that in one or more embodiments provided by the invention, the intelligent signal isolation
Device circuit further includes communicating circuit, and the communicating circuit is electrically connected with the main control circuit and exterior terminal respectively, described logical
News circuit is electrically connected with the second output terminal of the power circuit.It can directly be connect with PLC, host computer by the communicating circuit
Mouth communication, can be read directly the isolation signals value of actual monitoring.Facilitate DCS industrial control system teledata output and
Monitoring.Here, the communicating circuit uses RS485 communication interface chip U4, model SP485, communicated by RS485,
Modbus-RTU agreement directly reads the standard current signal value of actual monitoring, while can also be real by software debugging platform
Calibration of the row to product range ability.The adjustment of outputting standard current signal, by the pwm signal for changing main control circuit output
Duty ratio, to realize the adjustment to output signal zero degree 4mA, full scale signal 20mA, it is preferred to use multipoint mode calibration.
Intelligent signal isolator circuit of the invention, stable and reliable for performance, the precision of signal isolator can achieve 0.1%
FS, completely can be with import substitutes, and product has been produced in batches and has been widely applied.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of intelligent signal isolator circuit, it is characterised in that: including power protecting circuit, power circuit, signal processing electricity
Road, main control circuit and isolation pick-up output circuit, power supply are electrically connected with the power protecting circuit, the power protecting circuit
With being electrically connected for the power circuit, the power circuit respectively with the signal processing circuit, main control circuit and change is isolated
Send output circuit to be electrically connected, external perimysium reference current signal accesses the signal processing circuit, the signal processing circuit with it is described
The electrical connection of pick-up output circuit, the isolation pick-up output is isolated with described in main control circuit electrical connection, the main control circuit
The external output signal of circuit.
2. intelligent signal isolator circuit according to claim 1, it is characterised in that: the power protecting circuit includes certainly
Restore fuse PTC, Transient Suppression Diode TVS, common mode inductance L1 and diode D1, positive pole to protect by the self- recoverage
Dangerous silk PTC is electrically connected with the cathode of the Transient Suppression Diode TVS, the anode and power supply of the Transient Suppression Diode TVS
Ground electrical connection, the cathode of the Transient Suppression Diode TVS are electrically connected with one end of the one of winding of common mode inductance L1,
The corresponding termination power ground of another winding of the common mode inductance L1, the other end of mono- winding of the common mode inductance L1 and institute
The anode electrical connection of diode D1 is stated, the cathode of the diode D1 is electrically connected with the power circuit, the common mode inductance L1
The other end of another winding is grounded.
3. intelligent signal isolator circuit according to claim 2, it is characterised in that: the power protecting circuit further includes
Resistance capaciting absorpting circuit, the resistance capaciting absorpting circuit include parallel connection after resistance R0 and capacitor C0, the resistance R0 and capacitor C0 series connection
Between the cathode and anode of the Transient Suppression Diode TVS.
4. intelligent signal isolator circuit according to claim 2, it is characterised in that: the power circuit includes resistance
R1, resistance R2, resistance R3, capacitor C1, capacitor C2, capacitor C3, capacitor C4, diode D2, switch controller U2, diode D3,
Optocoupler U3, diode D4, transformer T, current rectifying and wave filtering circuit and filter circuit of pressure-stabilizing, the one of the primary coil of the transformer T
End is electrically connected with the cathode of the cathode of the diode D1 and diode D2 respectively, anode and the transformation of the diode D2
Be parallel with the resistance R1 and capacitor C2 between the other end of the primary coil of device T, the primary coil of the transformer T it is another
End is electrically connected with the drain electrode of the switch controller U2, the source electrode ground connection of the switch controller U2, and the capacitor C1 is electrically connected
It connects between the cathode of the diode D1 and the source electrode of switch controller U2, the capacitor C4 is connected electrically in the switch control
Between the source electrode and control terminal of device U2, one end of the feedback coil of the transformer T is electrically connected with the anode of the diode D3,
The cathode of the diode D3 is electrically connected by the capacitor C3 with the other end of the feedback coil of the transformer T, the change
The other end of the feedback coil of depressor T is grounded, and the cathode of the diode D3 is electrically connected with the collector of the optocoupler U3, described
The emitter of optocoupler U3 is electrically connected with the control terminal of the switch controller U2, the both ends point of the secondary coil of the transformer T
It is not corresponding with two input terminals of the current rectifying and wave filtering circuit electrical connection, two output ends of the current rectifying and wave filtering circuit with it is described
The corresponding electrical connection of two input terminals of filter circuit of pressure-stabilizing, the anode of the optocoupler U3 are filtered by the resistance R2 and the rectification
One output end of wave circuit is electrically connected, and the cathode of the optocoupler U3 is electrically connected with the cathode of the diode D4, two pole
The anode of pipe D4 is electrically connected with the another output of the current rectifying and wave filtering circuit, is led between the cathode and anode of the optocoupler U3
The resistance R3 electrical connection is crossed, the filter circuit of pressure-stabilizing has the first output end, second output terminal, third output end and the 4th
Output end, and the first output end of the filter circuit of pressure-stabilizing and third the output end power supply with the signal amplification circuit respectively
Input terminal electrical connection, the second output terminal of the filter circuit of pressure-stabilizing are electrically connected with the power input of the main control circuit,
4th output end of the filter circuit of pressure-stabilizing is electrically connected with the power input that pick-up output circuit is isolated.
5. intelligent signal isolator circuit according to claim 1, it is characterised in that: the signal processing circuit includes limit
It can circuit, resistance R14, resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, capacitor C26, capacitor
C27, capacitor C28, capacitor C29 and operational amplifier U8, standard current signal access the limit energy circuit, the limit energy circuit
It is in sequential series between one output end and the non-inverting input terminal of the operational amplifier U8 to have the resistance R14 and resistance R16, institute
State and be parallel with the resistance R15 and capacitor C26 between resistance R14 and the common end and ground of resistance R16, the limit energy circuit it is another
One output end ground connection, the non-inverting input terminal of the operational amplifier U8 are grounded by the capacitor C27, the operational amplifier
The inverting input terminal of U8 is grounded by the resistance R17, electric between the inverting input terminal and output end of the operational amplifier U8
Be connected with the resistance R18, the positive supply input terminal and negative supply input terminal of the operational amplifier U8 respectively with the power supply
The corresponding electrical connection of the first output end and third output end of circuit, sequentially goes here and there between the output end and ground of the operational amplifier U8
The common end of the resistance R19, capacitor C28, capacitor C29 and resistance R20, the resistance R19 and capacitor C28 are associated with as positive letter
Number output end is electrically connected with the positive signal input terminal of the main control circuit, the public termination of the capacitor C28 and capacitor C29
Negative signal input terminal of the common end of ground, the capacitor C29 and resistance R20 as negative signal output end and the main control circuit
Electrical connection.
6. intelligent signal isolator circuit according to claim 5, it is characterised in that: the limit energy circuit includes diode
D10, diode D11, Transient Suppression Diode TVS2, Transient Suppression Diode TVS3 and self-recovery fuse PTC2, standard electric
Stream signal accesses the anode of the diode D10, and the cathode of the diode D10 is electrically connected with the anode of diode D11, described
The cathode of the diode D11 negative electricity with the cathode of the Transient Suppression Diode TVS2 and Transient Suppression Diode TVS3 respectively
Connection, the anode of the Transient Suppression Diode TVS2 and the anode of Transient Suppression Diode TVS3 are used as another output
Ground connection, the cathode of the diode D11 are electrically connected with one end of the self-recovery fuse PTC2, the self-recovery fuse
The other end of PTC2 is electrically connected as an output end with one end of the resistance R14.
7. intelligent signal isolator circuit according to claim 1, it is characterised in that: the isolation pick-up output circuit packet
Include resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, capacitor C23,
Capacitor C24, capacitor C25, optocoupler U5, zener diode D8, trigger U6, two pole operational amplifier U7, triode Q5 and pressure stabilizing
The signal output end of pipe D9, the main control circuit are electrically connected by the resistance R5 with the anode of the optocoupler U5, the light
The collector of the minus earth of coupling U5, the optocoupler U5 is electrically connected by the anode of the resistance R6 and the zener diode D9
It connects, the cathode of the diode D9 is electrically connected with the 4th output end of the power circuit, and the emitter of the optocoupler U5 passes through
Resistance R7 ground connection, the emitter of the optocoupler U5 ground connection with the anode of the zener diode D8 and trigger U6 respectively
End electrical connection, the cathode of the zener diode D8 are electrically connected with the anode of the zener diode D9, the zener diode
It is electrically connected between the reference pole and cathode of D8 by the resistance R8, is electrically connected between the cathode and anode of the zener diode D8
It is connected to the capacitor C23, the collector of the optocoupler U5 is electrically connected with the input terminal of the trigger U6, the trigger U6's
Power input is electrically connected with the anode of the zener diode D9, the output end and the operational amplifier of the trigger U6
It is in sequential series between the non-inverting input terminal of U7 to have the common end of the resistance R9 and resistance R10, the resistance R9 and resistance R10 logical
It crosses the capacitor C24 to be electrically connected with the anode of the zener diode D9, the non-inverting input terminal of the operational amplifier U7 passes through
The anode of the capacitor C25 and the zener diode D9 are electrically connected, the inverting input terminal of the operational amplifier U7 with it is described
It is in sequential series between the anode of zener diode D9 to have a resistance R12 and resistance R13, and the resistance R12 and resistance R13
Common end is electrically connected with the emitter of the triode Q5, and the base stage of the triode Q5 passes through the resistance R11 and the fortune
Calculate the output end electrical connection of amplifier U7, the collector of the triode Q5 as positive signal output end, the triode Q5's
Collector is electrically connected with the anode of external impressed current table mA, and the cathode of external impressed current table mA is as negative signal output end, external impressed current
The cathode of table mA is grounded.
8. intelligent signal isolator circuit according to claim 1-7, it is characterised in that: further include communication electricity
Road, the communicating circuit are electrically connected with the main control circuit and exterior terminal respectively, the communicating circuit and power supply electricity
The second output terminal on road is electrically connected.
9. intelligent signal isolator circuit according to claim 1-7, it is characterised in that: the main control circuit
Using MSP430 series monolithic.
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| CN201910823750.1A CN110413035B (en) | 2019-09-02 | 2019-09-02 | Intelligent signal isolator circuit |
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| CN111800097A (en) * | 2020-06-30 | 2020-10-20 | 南京麦澜德医疗科技有限公司 | AC/DC signal isolation amplifying circuit |
| CN113595381A (en) * | 2021-08-02 | 2021-11-02 | 成都迈林特科技有限公司 | Expandable airborne power supply device with TVS anti-jamming circuit |
| WO2024002248A1 (en) * | 2022-06-30 | 2024-01-04 | 施耐德电器工业公司 | Solid-state motor starter |
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| CN110413035B (en) | 2024-05-24 |
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