Circuit for converting 0-10V analog voltage signal to -25mA to +25mA current signal

Abstract

A circuit for converting a 0-10V analog voltage signal to a -25mA to +25mA current signal, including a bias circuit and a voltage-to-current circuit; the bias circuit includes a resistor circuit and an amplifier circuit; the resistor circuit includes a first resistor and a third resistor connected in parallel; the amplifier circuit includes a first amplifier and a second amplifier, and the voltage-to-current circuit includes the second amplifier. The output terminal of the first amplifier is connected to the inverting input terminal of the second amplifier through a thirteenth resistor. The inverting input terminal of the twelfth amplifier is connected to one end of a seventh resistor and one end of an eighth resistor. The other end of the seventh resistor is connected to the first resistor and the third resistor connected in parallel. The other end of the eighth resistor is connected to the output terminal of the second amplifier; the non-inverting input terminal of the second amplifier is grounded through a fifteenth resistor. The circuit for converting a 0-10V analog voltage signal to a -25mA to +25mA current signal of the present invention has a simple and reliable circuit, the output current is not affected by the load, the converted current signal has high accuracy, and it is convenient for signal transmission, measurement and control.

Description

Technical Field

[0001] The present invention relates to the field of electronic circuits, and specifically to a circuit for converting a 0-10V analog voltage signal into a -25mA to +25mA current signal. Background Art

[0002] When a voltage signal is transmitted over a long distance, the voltage signal is easily interfered by the outside world, resulting in inaccurate signals, while the current signal is not easily interfered. Currently, many industrial controllers usually have a 0-10V analog voltage output function to reduce the interference of control signals during transmission. For the connection problem between the controller and the controlled device and the signal transmission problem, therefore, a circuit is needed that can convert the voltage signal into a current signal for long-distance transmission to complete the control connection between the controller and the control device. Summary of the Invention

[0003] The present invention provides a circuit that can convert a 0-10V analog voltage signal into a -25mA to +25mA current signal to solve the problems existing in the prior art.

[0004] The present invention adopts the following technical solutions:

[0005] A circuit for converting a 0-10V analog voltage signal into a -25mA to +25mA current signal includes a bias circuit and a voltage-to-current circuit;

[0006] The bias circuit includes a resistor circuit and an amplifier circuit;

[0007] The resistor circuit includes a first resistor R1 and a third resistor R3 connected in parallel;

[0008] The amplifier circuit includes a first amplifier U1 and a second amplifier U2. A tenth resistor R10 is connected between the inverting input terminal and the output terminal of the first amplifier U1. And the inverting input terminal of the first amplifier U1 is connected to one end of a twelfth resistor R12, and the other end of the twelfth resistor R12 is connected to the voltage input port VCC. The non-inverting input terminal of the first amplifier U1 is grounded through a sixteenth resistor R16;

[0009] The voltage-to-current circuit includes a second amplifier U2. The output terminal of the first amplifier U1 is connected to the inverting input terminal of the second amplifier U2 through a thirteenth resistor R13. The inverting input terminal of the twelfth amplifier U2 is connected to one end of a seventh resistor R7 and one end of an eighth resistor R8. The other end of the seventh resistor R7 is connected to the first resistor R1 and the third resistor R3 connected in parallel. The other end of the eighth resistor R8 is connected to the output terminal of the second amplifier U2; the non-inverting input terminal of the second amplifier U2 is grounded through a fifteenth resistor R15;

[0010] The output terminal of the second amplifier U2 is connected to the output terminal of the first voltage follower U3, the non-inverting input terminal of the second voltage follower U4, the output terminal of the third voltage follower U5, and the non-inverting input terminal of the fourth voltage follower U6. The output terminal of the first voltage follower U3 is connected to the inverting input terminal of the first voltage follower U3. The non-inverting input terminal of the first voltage follower U3 is connected to the non-inverting input terminal of the third voltage follower U5, the emitter of the first triode Q1, and the emitter of the second triode Q2. The inverting input terminal of the second voltage follower U4 is connected to the emitter of the first diode Q1, and the output terminal of the second voltage follower U4 is connected to the base of the first diode Q1. The inverting input terminal of the third voltage follower U3 is connected to the output terminal of the third voltage follower U5, and the non-inverting input terminal of the third voltage follower U5 is grounded through the fourteenth resistor R14. The inverting input terminal of the fourth voltage follower U6 is connected to the emitter of the second triode Q2, and the output terminal of the fourth voltage follower U6 is connected to the base of the second triode Q2.

[0011] The collectors of the first triode Q1 and the second triode Q2 are both connected to the power supply, and the emitters of the first triode Q1 and the second triode Q2 are both grounded through the fourteenth resistor R14.

[0012] The models of the first amplifier U1, the second amplifier U2, the first voltage follower U3, the second voltage follower U4, the third voltage follower U5, and the fourth voltage follower U6 are all TL082.

[0013] Advantages of the present invention:

[0014] The 0-10V analog voltage signal to -25mA to +25mA current signal circuit of the present invention has a simple and reliable circuit, the output current is not affected by the load, the converted current signal has high precision, and it is convenient for signal transmission, measurement and control. Description of the Drawings

[0015] Figure 1 It is the circuit structure diagram of the present invention. Detailed Embodiment

[0016] The present invention will be further described in detail below in conjunction with the drawings and the detailed embodiment.

[0017] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same technical meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0018] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. It should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] The circuit for converting a 0-10V analog voltage signal to a -25mA to +25mA current signal provided by the present invention includes a bias circuit and a voltage-to-current conversion circuit; the bias circuit includes a resistor circuit and an amplifier circuit.

[0020] Specifically, as Figure 1 shown, the resistor circuit includes a first resistor R1 and a third resistor R3 connected in parallel. The other end of the first resistor R1 is connected to the power supply VCC, and the other end of the third resistor R3 is grounded. The parallel-connected first resistor R1 and third resistor R3 are connected to the other end of the seventh resistor R7.

[0021] The amplifier circuit includes a first amplifier U1 and a second amplifier U2. A tenth resistor R10 is connected between the inverting input terminal and the output terminal of the first amplifier U1, and the inverting input terminal of the first amplifier U1 is connected to one end of a twelfth resistor R12. The other end of the twelfth resistor R12 is connected to the voltage input port VCC. The non-inverting input terminal of the first amplifier U1 is grounded through a sixteenth resistor R16. The voltage input port VCC connected to the other end of the twelfth resistor R12 above is a 0-10V analog voltage signal input port.

[0022] The voltage-to-current conversion circuit includes a second amplifier U2. The output terminal of the first amplifier U1 is connected to the inverting input terminal of the second amplifier U2 through a thirteenth resistor R13. At the same time, the inverting input terminal of the twelfth amplifier U2 is connected to one end of the seventh resistor R7 and one end of an eighth resistor R8. The other end of the eighth resistor R8 is connected to the output terminal of the second amplifier U2; the non-inverting input terminal of the second amplifier U2 is grounded through a fifteenth resistor R15.

[0023] The output terminal of the second amplifier U2 is connected to one end of a fourth resistor R4 and one end of an eighteenth resistor R18. The other end of the fourth resistor R4 is connected to one end of a second resistor R2, the non-inverting input terminal of a second voltage follower U4, and the output terminal of a first voltage follower U3. The output terminal of the first voltage follower U3 is connected to the inverting input terminal of the first voltage follower U3. The non-inverting input terminal of the first voltage follower U3 is connected to the non-inverting input terminal of a third voltage follower U5, connected to the emitter of a first triode Q1 through a sixth resistor R6, connected to the emitter of a second triode Q2 through a twentieth resistor R20, and one end of a fourteenth resistor R14.

[0024] The inverting input terminal of the second voltage follower U4 is connected to the end where the ninth resistor R9 and the eleventh resistor R11 are connected. The other end of the ninth resistor R9 is connected to the emitter of the first diode Q1. The other end of the eleventh resistor R11 is grounded. The output terminal of the second voltage follower U4 is connected to one end of the fifth resistor R5. The other end of the fifth resistor R5 is connected to the base of the first diode Q1. The collector of the second follower U4 is connected to the power supply VCC.

[0025] The other end of the eighteenth resistor R18 is connected to one end of the seventeenth resistor R17 and the non-inverting input terminal of the fourth voltage follower U6. The other end of the seventeenth resistor R17 is connected to the output terminal of the third voltage follower U5. The inverting input terminal of the third voltage follower U5 is connected to the output terminal of the third voltage follower U5. The non-inverting input terminal of the third voltage follower U5 is connected to one end of the fourteenth resistor R14. The other end of the fourteenth resistor R14 is the load port.

[0026] The inverting input terminal of the fourth voltage follower U6 is connected to the end where the twenty-first resistor R21 and the twenty-second resistor R22 are connected. The other end of the twenty-first resistor R21 is connected to the emitter of the second triode Q2. The output terminal of the fourth voltage follower U6 is connected to the base of the second triode Q2 through the nineteenth resistor R19. The collector of the second triode Q2 is connected to the power supply VCC. The other end of the twenty-second resistor R22 is grounded.

[0027] The VCC power supply of all the above amplifiers and followers is a 15V power supply, that is, V+ is connected to +15V voltage and V- is connected to -15V voltage.

[0028] The resistance values of the above R1, R2, R3, R4, R5, R6, R7, R8, R9, R11, R12, R14, R15, R17, R18, R20, R21, R22 are 100 kΩ, the 10th and 16th resistors are 510 Ω, and the 13th and 19th resistors are 250 Ω.

[0029] The models of the above amplifiers and followers are all TL082.

[0030] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0031] Although the specific implementation manners of the present invention are described above in conjunction with the drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.

Claims

A circuit for converting a 1.0 - 10V analog voltage signal to a -25mA to +25mA current signal, characterized in that: It includes a bias circuit and a voltage-to-current circuit; The bias circuit includes a resistor circuit and an amplifier circuit; The resistor circuit includes a first resistor (R1) and a third resistor (R3) connected in parallel; The amplifier circuit includes a first amplifier (U1) and a second amplifier (U2). A tenth resistor (R10) is connected between the inverting input terminal and the output terminal of the first amplifier (U1). One end of a twelfth resistor (R12) is connected to the inverting input terminal of the first amplifier (U1), and the other end of the twelfth resistor (R12) is connected to the voltage input port VCC. The non-inverting input terminal of the first amplifier (U1) is grounded through a sixteenth resistor (R16); the voltage input port VCC connected to the other end of the twelfth resistor R12 is a 0-10V analog voltage signal input port; The voltage-to-current circuit includes a second amplifier (U2). The output terminal of the first amplifier (U1) is connected to the inverting input terminal of the second amplifier (U2) through a thirteenth resistor (R13). The inverting input terminal of the twelfth amplifier (U2) is connected to one end of a seventh resistor (R7) and one end of an eighth resistor (R8). The other end of the seventh resistor (R7) is connected to the first resistor (R1) and the third resistor (R3) connected in parallel. The other end of the eighth resistor (R8) is connected to the output terminal of the second amplifier (U2); the non-inverting input terminal of the second amplifier (U2) is grounded through a fifteenth resistor (R15); The output terminal of the second amplifier (U2) is connected to the output terminal of a first voltage follower (U3), the non-inverting input terminal of a second voltage follower (U4), the output terminal of a third voltage follower (U5), and the non-inverting input terminal of a fourth voltage follower (U6). The output terminal of the first voltage follower (U3) is connected to its own inverting input terminal. The non-inverting input terminal of the first voltage follower (U3) is connected to the non-inverting input terminals of the third voltage follower (U5), the emitter of a first triode (Q1), and the emitter of a second triode (Q2). The inverting input terminal of the second voltage follower (U4) is connected to the emitter of the first diode (Q1), and the output terminal of the second voltage follower (U4) is connected to the base of the first diode (Q1); the inverting input terminal of the first voltage follower (U3) is connected to the output terminal of the third voltage follower (U5). The non-inverting input terminal of the third voltage follower (U5) is grounded through a fourteenth resistor (R14); the inverting input terminal of the fourth voltage follower (U6) is connected to the emitter of the second triode (Q2), and the output terminal of the fourth voltage follower (U6) is connected to the base of the second triode (Q2); The collectors of the first triode (Q1) and the second triode (Q2) are both connected to the power supply. The emitters of the first triode (Q1) and the second triode (Q2) are both grounded through a fourteenth resistor (R14); The inverting input terminal of the third voltage follower (U5) is connected to its own output terminal. The non-inverting input terminal of the third voltage follower (U5) is connected to one end of a fourteenth resistor (R14), and the other end of the fourteenth resistor (R14) is the load port.

2. The circuit for converting a 0-10V analog voltage signal to a -25mA to +25mA current signal according to claim 1, characterized in that: The models of the first amplifier (U1), the second amplifier (U2), the first voltage follower (U3), the second voltage follower (U4), the third voltage follower (U5), and the fourth voltage follower (U6) are all TL082.

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