CN213817732U - Simple signal conversion circuit - Google Patents
Simple signal conversion circuit Download PDFInfo
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- CN213817732U CN213817732U CN202022910850.9U CN202022910850U CN213817732U CN 213817732 U CN213817732 U CN 213817732U CN 202022910850 U CN202022910850 U CN 202022910850U CN 213817732 U CN213817732 U CN 213817732U
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Abstract
The application discloses simple signal conversion circuit. The method comprises the following steps: the voltage analog input end B, the current analog output end C, and a resistor, a transient diode, a slide rheostat, a jumper switch, a triode Q1, a capacitor C1 and an inverting addition amplifier A1 which are arranged between the voltage analog input end B and the current analog output end; the design of a single-input double-output circuit is adopted, a voltage analog input end B is used for converting two current analog output ends C with different current specifications, and the current analog output ends C are connected with a control module of a control room and used for transmitting current to the control room; rectifying the current by using a diode; carrying out current amplification output by using the current amplification characteristic of the triode Q1; the jumper switch is used for controlling the switching of two current analog quantity output ends C with different specifications; the whole circuit reduces current loss and voltage error generated in the signal transmission process by using a constant current output circuit formed by the operational amplifier, thereby ensuring the signal transmission precision.
Description
Technical Field
The disclosure generally relates to the technical field of various PLC analog quantity control systems, in particular to the technical field of engineering machinery, and specifically relates to a simple signal conversion circuit.
Background
The traditional analog output circuit research mainly focuses on researches in the aspects of D/A conversion modules, optical coupling isolation transmission modules, output protection and the like.
In the technical field of engineering machinery, when voltage source signals are transmitted, the distance between a site and a control room is long, so that the voltage source signals form long-distance transmission, and large errors are generated in the actual transmission of the voltage source signals due to the voltage division effect of a wire resistor and an input resistor of a receiving instrument; therefore, we propose a simple signal conversion circuit to solve the problem that the voltage of the voltage source signal is divided during long-distance transmission, the anti-interference performance is poor, and the transmission accuracy is affected.
Disclosure of Invention
In view of the above-mentioned defects or shortcomings in the prior art, it is desirable to provide a simple signal conversion circuit that uses a constant current source signal as a long-distance transmission signal, has stable signal conversion, can expand the output signal range, improves the anti-interference capability, and ensures the signal transmission precision.
In a first aspect, the present application provides a simple signal conversion circuit, including: the voltage analog quantity output end B, the current analog quantity output end C, and a resistor, a transient diode, a slide rheostat, a jumper switch, a triode Q1, a capacitor C1 and an inverting summing amplifier A1 which are arranged between the voltage analog quantity input end B and the current analog quantity output end;
the positive electrode of the voltage analog input end B is connected with a fifth resistor R5, and the negative electrode of the voltage analog input end B is grounded; the other end of the fifth resistor R5 is connected with a fourth resistor R4, a second transient diode TVS2 and an eighth resistor R8;
the fourth resistor R4 is connected with the first end of the first current limiting circuit; the second end of the first current limiting circuit is connected with a second resistor R2, a first jumper switch J1 and a first resistor R1; the other end of the first resistor R1 is connected with a first transient diode TVS1 and a third resistor R3; the other ends of the first transient diode TVS1 and the third resistor R3 are grounded respectively; the third end of the first current limiting circuit is connected with a seventh resistor R7 and the inverting summing amplifier A1 +; the other end of the seventh resistor R7 is grounded;
the output end of the inverting addition amplifier A1 is connected with one end of a diode D1; the other end of the diode D1 is connected with a triode Q1; an emitting electrode of the triode Q1 is connected with an eleventh resistor R11 and outputs the current to the current analog quantity output end C, and a collecting electrode of the triode Q1 is connected with a power supply input end + VCC;
the eighth resistor R8 is connected with one end of the inverting addition amplifier A1-and the denoising circuit; the other end of the denoising circuit is connected with one end of a twelfth resistor R12 and outputs the other end of the twelfth resistor to the current analog quantity output end C; the other end of the twelfth resistor R12 is connected to one end of a thirteenth resistor R13 and one end of a second jumper switch J2, and the other end of the thirteenth resistor R13 is connected to the other end of the second jumper switch J2 and grounded.
According to the technical scheme provided by the embodiment of the application, the first current limiting circuit comprises: a first slide rheostat R14 and a sixth resistor R6 connected with a sliding end of the first slide rheostat R14;
the first end of the first slide rheostat R14 is connected with the fourth resistor R4; a second end of the first sliding rheostat R14 is connected with the second resistor R2, the first jumper switch J1 and the first resistor R1; the other end of the sixth resistor R6 is connected to the seventh resistor R7 and the inverting addition amplifier a1 +.
According to the technical scheme provided by the embodiment of the application, the denoising circuit comprises: a capacitor C1 and a second current limiting circuit connected to both ends of the capacitor C1;
one end of the capacitor C1 and the second current limiting circuit is connected to the eighth resistor R8 and the inverting addition amplifier a 1-.
According to the technical scheme provided by the embodiment of the application, the second current limiting circuit comprises: a ninth resistor R9 having one end connected to the capacitor C1 and a second sliding resistor R15 connected to the other end of the ninth resistor R9;
the first end and the sliding end of the second sliding rheostat R15 are connected with the other end of the ninth resistor R9, and the second end of the second sliding rheostat R15 is connected with the other end of the capacitor C1 and one end of the twelfth resistor R12 and is output to the current analog quantity output end C.
According to the technical scheme provided by the embodiment of the application, the method further comprises the following steps: a power input terminal A;
the power input end A is used for providing power for the triode Q1 and the inverting summing amplifier A1.
According to the technical scheme provided by the embodiment of the application, the power input end A is further connected with a switch module power supply T40.
According to the technical scheme provided by the embodiment of the application, the switch module power supply T40 is a 220V/15V switch module power supply; the voltage analog input end B is a 0-10V input end; the current analog quantity output end C is a 0-20/4-20mA analog quantity output end.
According to the technical scheme provided by the embodiment of the application, the capacitor C1 is an electrolytic capacitor, a container capacitor or a ceramic capacitor.
In summary, the present disclosure specifically discloses a specific circuit structure of a simple signal conversion circuit. The method specifically adopts a single-input double-output circuit design, a voltage analog input end B is used for converting two current analog output ends C with different current specifications, and the current analog output ends C are connected with a control module of a control room and used for transmitting current to the control room; rectifying the current in the circuit by using a diode to control the current directivity; carrying out current amplification output by using the current amplification characteristic of the triode Q1; the switching of the current analog quantity output ends C with two different current specifications is controlled through the first jumper switch J1 and the second jumper switch J2; when the first jumper switch J1 is turned on and the second jumper switch J2 is turned off, the current is outputted as one current specification of the current analog quantity output end C, and when the first jumper switch J1 is turned off and the second jumper switch J2 is turned on, the current is outputted as the other current specification of the current analog quantity output end C; furthermore, the whole circuit reduces current loss and voltage error generated in the signal transmission process by using a constant current output circuit formed by the operational amplifier, thereby ensuring the signal transmission precision.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 and fig. 2 are circuit flow diagrams of a simple signal conversion circuit.
Fig. 3 is a schematic flow chart of the connection between the power input terminal a and the switch module power supply T40.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example one
Please refer to fig. 1 and fig. 2, which are schematic flow charts of a simple signal conversion circuit provided in the present application, including: the voltage analog quantity output end B, the current analog quantity output end C, and a resistor, a transient diode, a slide rheostat, a jumper switch, a triode Q1, a capacitor C1 and an inverting summing amplifier A1 which are arranged between the voltage analog quantity input end B and the current analog quantity output end;
the positive electrode of the voltage analog input end B is connected with a fifth resistor R5, and the negative electrode of the voltage analog input end B is grounded; the other end of the fifth resistor R5 is connected with a fourth resistor R4, a second transient diode TVS2 and an eighth resistor R8;
the fourth resistor R4 is connected with the first end of the first current limiting circuit; the second end of the first current limiting circuit is connected with a second resistor R2, a first jumper switch J1 and a first resistor R1; the other end of the first resistor R1 is connected with a first transient diode TVS1 and a third resistor R3; the other ends of the first transient diode TVS1 and the third resistor R3 are grounded respectively; the third end of the first current limiting circuit is connected with a seventh resistor R7 and the inverting summing amplifier A1 +; the other end of the seventh resistor R7 is grounded;
the output end of the inverting addition amplifier A1 is connected with one end of a diode D1; the other end of the diode D1 is connected with a triode Q1; an emitting electrode of the triode Q1 is connected with an eleventh resistor R11 and outputs the current to the current analog quantity output end C, and a collecting electrode of the triode Q1 is connected with a power supply input end + VCC;
the eighth resistor R8 is connected with one end of the inverting addition amplifier A1-and the denoising circuit; the other end of the denoising circuit is connected with one end of a twelfth resistor R12 and outputs the other end of the twelfth resistor to the current analog quantity output end C; the other end of the twelfth resistor R12 is connected to one end of a thirteenth resistor R13 and one end of a second jumper switch J2, and the other end of the thirteenth resistor R13 is connected to the other end of the second jumper switch J2 and grounded.
In this embodiment, the specification of the voltage analog input terminal B may be, for example, a 0-10V input terminal; the specification of the current analog quantity output end C is optionally, for example, a 0-20/4-20mA analog quantity output end; the current analog quantity output end C is connected with a control module of the control room and used for stably transmitting current to the control room;
the circuit structure adopts a single-input double-output circuit design, realizes the conversion of 0-20mA and 4-20mA analog quantity output ends from a 0-10V input end, rectifies current in the circuit by using a diode, controls the current directivity, and performs current amplification output by using the current amplification characteristic of a triode Q1; the switching of the 0-20mA and 4-20mA analog quantity output ends is controlled by a first jumper switch J1 and a second jumper switch J2; when the first jumper switch J1 is turned on and the second jumper switch J2 is turned off, the analog quantity output is 0-20mA, the first jumper switch J1 is turned off, and when the second jumper switch J2 is turned on, the analog quantity output is 4-20 mA;
the whole circuit reduces current loss and voltage error generated in the signal transmission process by using a constant current output circuit formed by operational amplifiers, thereby ensuring the signal transmission precision;
wherein the first current limiting circuit comprises: a first slide rheostat R14 and a sixth resistor R6 connected with a sliding end of the first slide rheostat R14;
the first end of the first slide rheostat R14 is connected with the fourth resistor R4; a second end of the first sliding rheostat R14 is connected with the second resistor R2, the first jumper switch J1 and the first resistor R1; the other end of the sixth resistor R6 is connected with the seventh resistor R7 and the inverting addition amplifier A1 +;
a current limiting circuit is formed by the first slide rheostat R14 and the sixth resistor R6, and the current limiting circuit plays a role in limiting current;
wherein the denoising circuit includes: a capacitor C1 and a second current limiting circuit connected to both ends of the capacitor C1;
one end of the capacitor C1 and the second current limiting circuit is connected with the eighth resistor R8 and the inverting addition amplifier A1-;
the second current limiting circuit includes: a ninth resistor R9 having one end connected to the capacitor C1 and a second sliding resistor R15 connected to the other end of the ninth resistor R9;
a first end and a sliding end of the second sliding rheostat R15 are connected with the other end of the ninth resistor R9, and a second end of the second sliding rheostat R15 is connected with the other end of the capacitor C1 and one end of the twelfth resistor R12 and is output to the current analog quantity output end C;
a current limiting circuit is formed by the ninth resistor R9 and the second slide rheostat R15, and the current limiting function is achieved; and the capacitor C1, the ninth resistor R9 and the second slide rheostat R15 are connected in parallel in the circuit to achieve the effect of removing high-frequency noise; here, the type of the capacitor C1 is electrolytic capacitor, container capacitor, ceramic capacitor, or the like, and is not limited to a certain material, a certain package, or a certain capacitance;
the resistor and the slide rheostat used in the circuit are not limited to a certain material, a certain package or a certain capacitance value.
In any preferred embodiment, further comprising: a power input terminal A;
the power input end A is used for providing power for the triode Q1 and the inverting summing amplifier A1.
In this embodiment, as shown in fig. 3, the power input terminal a is used for externally connecting a power supply to supply power to the transistor Q1 and the inverting summing amplifier a 1;
the type of the external power supply is, for example, a switch module power supply T40, and the specific specification of the external power supply is 220V/15V switch module power supply;
the 220V/15V switch module power supply adopts bridge rectifier capacitor filtering to filter out alternating current components, integrates voltage stabilizing block positive and negative direct current power supply circuit design and outputs direct current voltage;
specifically, the power input end a is provided with a terminal 1, a terminal 2 and a terminal 3, the L end of the 220V/15V switch module power supply is connected with the terminal 1, the N end thereof is connected with the terminal 2, and the E end thereof is connected with the terminal 3;
in addition, in the circuit, only the power input end A is externally connected with a power supply, so that the problems of wiring errors and circuit device damage are reduced.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (8)
1. A simplified signal conversion circuit, comprising: the voltage analog quantity output end B, the current analog quantity output end C, and a resistor, a transient diode, a slide rheostat, a jumper switch, a triode Q1, a capacitor C1 and an inverting summing amplifier A1 which are arranged between the voltage analog quantity input end B and the current analog quantity output end;
the positive electrode of the voltage analog input end B is connected with a fifth resistor R5, and the negative electrode of the voltage analog input end B is grounded; the other end of the fifth resistor R5 is connected with a fourth resistor R4, a second transient diode TVS2 and an eighth resistor R8;
the fourth resistor R4 is connected with the first end of the first current limiting circuit; the second end of the first current limiting circuit is connected with a second resistor R2, a first jumper switch J1 and a first resistor R1; the other end of the first resistor R1 is connected with a first transient diode TVS1 and a third resistor R3; the other ends of the first transient diode TVS1 and the third resistor R3 are grounded respectively; the third end of the first current limiting circuit is connected with a seventh resistor R7 and the inverting summing amplifier A1 +; the other end of the seventh resistor R7 is grounded;
the output end of the inverting addition amplifier A1 is connected with one end of a diode D1; the other end of the diode D1 is connected with a triode Q1; an emitting electrode of the triode Q1 is connected with an eleventh resistor R11 and outputs the current to the current analog quantity output end C, and a collecting electrode of the triode Q1 is connected with a power supply input end + VCC;
the eighth resistor R8 is connected with one end of the inverting addition amplifier A1-and the denoising circuit; the other end of the denoising circuit is connected with one end of a twelfth resistor R12 and outputs the other end of the twelfth resistor to the current analog quantity output end C; the other end of the twelfth resistor R12 is connected to one end of a thirteenth resistor R13 and one end of a second jumper switch J2, and the other end of the thirteenth resistor R13 is connected to the other end of the second jumper switch J2 and grounded.
2. The simple signal conversion circuit according to claim 1, wherein the first current limiting circuit comprises: a first slide rheostat R14 and a sixth resistor R6 connected with a sliding end of the first slide rheostat R14;
the first end of the first slide rheostat R14 is connected with the fourth resistor R4; a second end of the first sliding rheostat R14 is connected with the second resistor R2, the first jumper switch J1 and the first resistor R1; the other end of the sixth resistor R6 is connected to the seventh resistor R7 and the inverting addition amplifier a1 +.
3. The simple signal conversion circuit as claimed in claim 1, wherein the de-noising circuit comprises: a capacitor C1 and a second current limiting circuit connected to both ends of the capacitor C1;
one end of the capacitor C1 and the second current limiting circuit is connected to the eighth resistor R8 and the inverting addition amplifier a 1-.
4. The simple signal conversion circuit according to claim 3, wherein the second current limiting circuit comprises: a ninth resistor R9 having one end connected to the capacitor C1 and a second sliding resistor R15 connected to the other end of the ninth resistor R9;
the first end and the sliding end of the second sliding rheostat R15 are connected with the other end of the ninth resistor R9, and the second end of the second sliding rheostat R15 is connected with the other end of the capacitor C1 and one end of the twelfth resistor R12 and is output to the current analog quantity output end C.
5. The simple signal conversion circuit according to claim 1, further comprising: a power input terminal A;
the power input end A is used for providing power for the triode Q1 and the inverting summing amplifier A1.
6. The simple signal conversion circuit as claimed in claim 5, wherein the power input terminal A is further connected to a switch module power supply T40.
7. The simple signal conversion circuit as claimed in claim 6, wherein the switch module power supply T40 is a 220V/15V switch module power supply; the voltage analog input end B is a 0-10V input end; the current analog quantity output end C is a 0-20/4-20mA analog quantity output end.
8. The simple signal conversion circuit as claimed in claim 1, wherein the capacitor C1 is an electrolytic capacitor, a capacitor or a ceramic capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022910850.9U CN213817732U (en) | 2020-12-08 | 2020-12-08 | Simple signal conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022910850.9U CN213817732U (en) | 2020-12-08 | 2020-12-08 | Simple signal conversion circuit |
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| Publication Number | Publication Date |
|---|---|
| CN213817732U true CN213817732U (en) | 2021-07-27 |
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| CN202022910850.9U Active CN213817732U (en) | 2020-12-08 | 2020-12-08 | Simple signal conversion circuit |
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| CN (1) | CN213817732U (en) |
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