CN216486100U - 0-10V analog output circuit for industrial field - Google Patents
0-10V analog output circuit for industrial field Download PDFInfo
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- CN216486100U CN216486100U CN202220838275.2U CN202220838275U CN216486100U CN 216486100 U CN216486100 U CN 216486100U CN 202220838275 U CN202220838275 U CN 202220838275U CN 216486100 U CN216486100 U CN 216486100U
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Abstract
The embodiment of the utility model discloses 0-10V analog output circuit of industrial field, including MCU, optoelectronic coupler, MOS pipe, reference voltage source, RC filter circuit, operational amplifier U2, resistance R1, resistance R3 and resistance R4, wherein, the IO mouth of MCU output PWM signal connects the input of optoelectronic coupler, and the output end of optoelectronic coupler connects the G utmost point of MOS pipe, and the S utmost point of MOS pipe is grounded; the D pole of the MOS tube is connected with a reference voltage source and is externally connected with 12V voltage through a resistor R1; the reference voltage source is connected with the positive electrode of the input end of the operational amplifier U2 through an RC filter circuit. The utility model discloses the circuit is simple and practical, the sexual valence relative altitude, the utility model discloses do not need the DAC converter, only need an IO mouth of MCU just can realize the 0-10V analog output signal of 8 at least DAC converter precisions.
Description
Technical Field
The utility model relates to an instrument and meter technical field especially relates to an industrial field's 0-10V analog output circuit.
Background
Analog voltage output signals of 0-5V or 0-10V are required in most industrial sites. The 0-5V output circuit is mainly realized by an 8-bit or 10-bit DAC converter. Most of the DAC converters in China have the power supply voltage of 5V, so that the 0-10V output circuit can be realized only by combining the DAC converters with an operational amplifier. High speed isolation periods are also required between the MCU and DAC converters to improve the instrument immunity to interference. For some occasions needing multi-channel analog quantity signal output in the field, the method has high cost, complex circuit and low cost performance.
SUMMERY OF THE UTILITY MODEL
The embodiment of the present invention provides an industrial site 0-10V analog output circuit to realize at least 0-10V analog output signal of 8-bit DAC converter precision.
In order to solve the technical problem, the embodiment of the utility model provides an industrial field ' S0-10V analog output circuit, including MCU, optoelectronic coupler, MOS pipe, reference voltage source, RC filter circuit, operational amplifier U2, resistance R1, resistance R3 and resistance R4, wherein, the integrated PWM drive of MCU, MCU output PWM signal ' S IO mouth connects optoelectronic coupler ' S input, optoelectronic coupler ' S output termination MOS pipe ' S G utmost point, MOS pipe ' S S utmost point ground connection, MOS pipe ' S G utmost point is through external 12V voltage of resistance R3 and resistance R4 and ground connection respectively; the D pole of the MOS tube is connected with a reference voltage source and is externally connected with 12V voltage through a resistor R1; the reference voltage source is connected with the positive electrode of the input end of the operational amplifier U2 through an RC filter circuit; the output end of the operational amplifier U2 is connected with the cathode of the input end, and the output end of the operational amplifier U2 outputs 0-10V analog quantity.
Furthermore, the circuit also comprises a resistor R5, wherein the resistor R5 is connected with the output end of the operational amplifier U2, so that the capacity of the operational amplifier with a capacitive load is improved, and oscillation is prevented.
Further, the RC filter circuit is a two-stage RC filter circuit and comprises a resistor R6, a resistor R7, a capacitor C2 and a capacitor C3, wherein the resistor R6 and the capacitor C2 are connected to form one RC filter, the resistor R7 and the capacitor C3 are connected to form the other RC filter, and the resistor R6 and the resistor R7 are connected in series and then are respectively connected with a reference voltage source and the anode of the input end of the operational amplifier U2.
Further, the MOS tube is an N MOS tube.
The utility model has the advantages that: the utility model discloses the circuit is simple and practical, the sexual valence relative altitude, the utility model discloses do not need the DAC converter, only need an IO mouth of MCU just can realize the 0-10V analog output signal of 8 at least DAC converter precisions.
Drawings
Fig. 1 is a circuit diagram of a part of a 0-10V analog output circuit in an industrial field according to an embodiment of the present invention.
Fig. 2 is another circuit diagram of the 0-10V analog output circuit in the industrial field according to the embodiment of the present invention.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict, and the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1-2, an industrial site 0-10V analog output circuit according to an embodiment of the present invention includes an MCU, a photocoupler, a MOS transistor, a reference voltage source, an RC filter circuit, an operational amplifier U2, a resistor R1, a resistor R3, and a resistor R4.
MCU integrated PWM drive, MCU output PWM signal's IO mouth connects optoelectronic coupler's input one utmost point, and optoelectronic coupler's input other utmost point connects 3.3V voltage through a resistance R2. The output end of the photoelectric coupler is connected with the G pole of the MOS tube, the S pole of the MOS tube is grounded, and the G pole of the MOS tube is externally connected with 12V voltage and grounded through a resistor R3 and a resistor R4. The D pole of the MOS tube is connected with a reference voltage source and is externally connected with 12V voltage through a resistor R1. The photoelectric coupler isolates the analog output and the load end from the MCU, and prevents the MCU from being interfered. The MOS transistor Q1 is used as a switching transistor. The IO port of the MCU outputs a PWM signal with the frequency of 500HZ, and the signal controls the on and off of the switch tube Q1 through the optical coupler.
The reference voltage source is connected with the positive electrode of the input end of the operational amplifier U2 through an RC filter circuit; the output end of the operational amplifier U2 is connected with the cathode of the input end, and the output end of the operational amplifier U2 outputs 0-10V analog quantity. The operational amplifier is a voltage follower to improve the driving capability of the signal.
The reference voltage source is a 10V reference power circuit, adopts a TL431 chip and consists of the TL431 chip, a resistor R8 and a resistor R9. The TL431, the resistor R8 and the resistor R9 form a 10V reference power circuit, and a 10V reference source obtains a PWM signal with the amplitude of 10V and the inverse phase of the PWM signal of the MCU through the switching control of the MOS transistor Q1. Because the pin 3 of the non-inverting input end of the operational amplifier is in a high impedance state, all PWM signals are filtered by two stages of RC of resistors R6 and R7 and capacitors C2 and C3 to obtain a direct-current voltage signal.
The magnitude of this voltage is: 10V x 1- (PWM signal duty cycle) ],
the required voltage value can be obtained by only adjusting the duty ratio of the PWM signal of the MCU.
As an implementation mode, the 0-10V analog output circuit in the industrial field further comprises a resistor R5, and the resistor R5 is connected with the output end of the operational amplifier U2, so that the capacity of the operational amplifier with a capacitive load is improved, and oscillation is prevented. The operational amplifier U2 is mainly used to improve the driving capability of the signal.
In one embodiment, the RC filter circuit is a two-stage RC filter circuit, and includes a resistor R6, a resistor R7, a capacitor C2, and a capacitor C3.
In one embodiment, the MOS transistor is an nmos transistor.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The 0-10V analog output circuit of an industrial field is characterized by comprising an MCU, a photoelectric coupler, an MOS (metal oxide semiconductor) tube, a reference voltage source, an RC (resistor-capacitor) filter circuit, an operational amplifier U2, a resistor R1, a resistor R3 and a resistor R4, wherein the MCU integrates PWM (pulse-width modulation) drive, an IO (input/output) port of the MCU for outputting a PWM signal is connected with the input end of the photoelectric coupler, the output end of the photoelectric coupler is connected with a G pole of the MOS tube, an S pole of the MOS tube is grounded, and the G pole of the MOS tube is respectively connected with 12V voltage and grounded through a resistor R3 and a resistor R4; the D pole of the MOS tube is connected with a reference voltage source and is externally connected with 12V voltage through a resistor R1; the reference voltage source is connected with the positive electrode of the input end of the operational amplifier U2 through an RC filter circuit; the output end of the operational amplifier U2 is connected with the cathode of the input end, and the output end of the operational amplifier U2 outputs 0-10V analog quantity.
2. The 0-10V analog output circuit of claim 1, further comprising a resistor R5, wherein the resistor R5 is connected to the output terminal of the operational amplifier U2, so as to improve the capacitive load carrying capability of the operational amplifier and prevent oscillation.
3. The 0-10V analog quantity output circuit in the industrial field as claimed in claim 1, characterized in that the RC filter circuit is a two-stage RC filter circuit, and is composed of a resistor R6, a resistor R7, a capacitor C2 and a capacitor C3, wherein a resistor R6 is connected with a capacitor C2 to form one RC filter, a resistor R7 is connected with a capacitor C3 to form the other RC filter, and the resistor R6 and the resistor R7 are connected in series and then respectively connected with a reference voltage source and the positive electrode of the input end of the operational amplifier U2.
4. The 0-10V analog output circuit of claim 1, wherein the MOS transistor is an N MOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220838275.2U CN216486100U (en) | 2022-04-13 | 2022-04-13 | 0-10V analog output circuit for industrial field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220838275.2U CN216486100U (en) | 2022-04-13 | 2022-04-13 | 0-10V analog output circuit for industrial field |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216486100U true CN216486100U (en) | 2022-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220838275.2U Active CN216486100U (en) | 2022-04-13 | 2022-04-13 | 0-10V analog output circuit for industrial field |
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| CN (1) | CN216486100U (en) |
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2022
- 2022-04-13 CN CN202220838275.2U patent/CN216486100U/en active Active
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