CN212692901U - Intelligent single-port multiplexing type current voltage transmitter - Google Patents
Intelligent single-port multiplexing type current voltage transmitter Download PDFInfo
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- CN212692901U CN212692901U CN202021453533.2U CN202021453533U CN212692901U CN 212692901 U CN212692901 U CN 212692901U CN 202021453533 U CN202021453533 U CN 202021453533U CN 212692901 U CN212692901 U CN 212692901U
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- operational amplifier
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Abstract
The utility model discloses an intelligence single mouthful of multiple current-voltage transducer, including connecting the anodal resistance R1 of input source simultaneously, resistance R2, resistance R2 is series connection diode D1 in proper order, n channel field effect unit Q1, the input source negative pole, resistance R1 is connecting resistance R4 simultaneously, the operational amplifier negative input end, connecting resistance R5 between operational amplifier positive input end and the operational amplifier output, the operational amplifier output still connects resistance R3 in proper order, MCU main control chip still connects n channel field effect unit Q1; the current detection and the voltage detection are integrated, so that the use cost is greatly reduced. Utility model multiplexing type current-voltage transmitter can detect the negative voltage simultaneously, has expanded applicable scope.
Description
Technical Field
The utility model belongs to the technical field of measurement and control equipment is kept apart to the electric quantity, concretely relates to multiplexing type current-voltage transmitter of intelligence list mouth.
Background
In daily life, various physical quantities exist, such as flow rate, pressure, temperature, speed and the like of liquid or gas, and the physical quantities can be measured by converting the physical quantities into electric signals through a sensor, wherein the electric signals comprise voltage signals and current signals, so that quantitative judgment of the corresponding physical quantities is usually achieved by measuring the magnitude of the corresponding voltage signals or current signals. Meanwhile, the state of the equipment can be judged according to the strength of a voltage or current signal in the equipment.
The voltage and current transducer types on the market are mainly single types, which are not reusable, and when equipment monitoring or corresponding physical quantity measurement is carried out, only single signal types of voltage or current can be detected, and the detection cannot be carried out simultaneously. If the current detection amount is switched to the voltage detection amount, the detection device needs to be replaced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multiplexing type current-voltage transducer of intelligence list mouth has solved prior art and has detected the problem that needs to change detection device when detecting to electric current and positive negative voltage.
The utility model discloses the technical scheme who adopts is, a multiplexing type current-voltage converter of intelligence list mouth, including connecting the anodal resistance R1 of input source simultaneously, resistance R2, resistance R2 is series resistance R3 in proper order, diode D1, n channel field effect unit Q1, the input source negative pole, resistance R1 connecting resistance R4 simultaneously, the operational amplifier positive input, connecting resistance R5 between operational amplifier negative input and the operational amplifier output, the operational amplifier output is connecting resistance R6 in proper order still, MCU main control chip still connects n channel field effect unit Q1.
The utility model discloses a characteristics still lie in:
the n-channel field effect unit Q1 comprises an n-channel field effect transistor, a diode is connected between the drain electrode and the source electrode of the n-channel field effect transistor, the port of the diode close to the drain electrode is a cathode, the source electrode of the n-channel field effect transistor is connected with the cathode of an input source, the drain electrode of the n-channel field effect transistor is connected with the cathode of a diode D1, and the grid electrode of the n-channel field effect transistor is connected with the MCU main control chip.
And a resistor R7 is connected between the negative input end of the operational amplifier and the reference voltage REF < -10 > V.
The negative pole of the input source is grounded.
The input source inputs 0-20 mA direct current or-10V- +10V direct current voltage.
The utility model has the advantages that:
the utility model relates to a multiplexing type current-voltage changer of intelligence list mouth synthesizes as an organic whole with current detection and voltage detection, greatly reduced use cost. Utility model multiplexing type current-voltage transmitter can detect the negative voltage simultaneously, has expanded applicable scope.
Drawings
Fig. 1 is the utility model discloses a multiplexing type current voltage transducer of intelligence single port schematic diagram.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model relates to a multiplexing type current-voltage transmitter of intelligence list mouth, as shown in fig. 1, including connecting the anodal resistance R1 of input source simultaneously, resistance R2, resistance R2 is series resistance R3 in proper order, diode D1, n channel field effect unit Q1, the input source negative pole, resistance R1 connecting resistance R4 simultaneously, the operational amplifier positive input, connecting resistance R5 between operational amplifier negative input end and the operational amplifier output, the operational amplifier output still connects gradually resistance R6, MCU main control chip still connects n channel field effect unit Q1.
The n-channel field effect unit Q1 comprises an n-channel field effect transistor, a diode is connected between the drain electrode and the source electrode of the n-channel field effect transistor, the port of the diode close to the drain electrode is a cathode, the source electrode of the n-channel field effect transistor is connected with the cathode of an input source, the drain electrode of the n-channel field effect transistor is connected with the cathode of a diode D1, and the grid electrode of the n-channel field effect transistor is connected with the MCU main control chip.
And a resistor R7 is connected between the negative input end of the operational amplifier and the reference voltage REF < -10 > V.
The negative pole of the input source is grounded.
The input source inputs 0-20 mA direct current or-10V- +10V direct current voltage.
The utility model discloses an effect of each components and parts is as follows in the current-voltage transmitter:
because the MCU main control chip can only detect positive voltage signals, if no reference voltage exists at the negative input end of the operational amplifier, when negative voltage signals need to be detected, the operational amplifier amplifies the input signals through the resistor R5 and the resistor R7 and then sends the amplified input signals to the MCU main control chip for corresponding signal processing. However, the MCU main control chip cannot detect the negative voltage signal, and therefore a-10V reference voltage needs to be set at the negative input port of the operational amplifier to raise the detection signal, so that the MCU main control chip can detect the negative voltage signal.
When the input signal is a voltage signal, the voltage received by the MCU is
Where Vo is the operational amplifier output voltage, VRVi is the input voltage, which is the reference voltage. When the input signal is a current signal, the voltage received by the MCU is
Where Vo is the operational amplifier output voltage, VRIs a reference voltage, IiIs the input current.
The resistors R1 and R4 divide the input positive and negative voltage signals. R2 and R3 convert the input current signal into a voltage signal. Q1 is a selection switch: when a voltage signal is input, Q1 is turned off; when the current signal is input, Q1 is turned on. D1 is a negative blocking diode that functions as: when a negative voltage is input, because a freewheeling diode of the Q1 exists, a reverse current flows out after passing through the freewheeling diode of the Q1, the resistor R3 and the resistor R2, and therefore, a signal is distorted under the condition of negative voltage input. The addition of D1 avoids this. The resistor R7 is an input resistor of the operational amplifier, the resistor R5 is a feedback resistor of the operational amplifier, and the resistor R6 carries out current-limiting protection on an output signal of the operational amplifier and an input port of the MCU.
The utility model relates to a multiplexing type current-voltage changer theory of operation of intelligence list mouth does:
the input source is 0-20 mA direct current or-10V- +10V direct current voltage; the MCU main control chip carries out corresponding processing on the input signal and controls an n-channel field effect transistor (MOS transistor).
When the input voltage is a voltage signal, the n-channel field effect transistor is in a cut-off state, voltage is divided through the resistors R1 and R4, the operational amplifier and the resistors R5 and R7 are used for amplification processing, the voltage is sent to the MCU main control chip to be subjected to A/D digital-to-analog conversion, and the acquired data are analyzed and processed.
When the input signal is current, the MCU main control chip controls the conduction of the n-channel field effect transistor, the current signal is converted into a voltage signal through the resistors R2 and R3, and the later working mode is the same as the voltage signal processing mode.
In this way, the utility model relates to a multiplexing type current-voltage changer of intelligence list mouth synthesizes as an organic whole with current detection and voltage detection, greatly reduced use cost. Utility model multiplexing type current-voltage transmitter can detect the negative voltage simultaneously, has expanded applicable scope.
Claims (5)
1. The utility model provides a multiplexing type current-voltage transmitter of intelligence single port, its characterized in that, includes anodal resistance R1, the resistance R2 of simultaneous connection input source, resistance R2 is series resistance R3, diode D1, n channel field effect unit Q1, the input source negative pole in proper order, resistance R1 is connecting resistance R4, operational amplifier negative input end simultaneously, connecting resistance R5 between operational amplifier positive input and the operational amplifier output, the operational amplifier output still connects gradually resistance R6, MCU main control chip, n channel field effect unit Q1 is still connected to MCU main control chip.
2. The intelligent single-port multiplexing-type current-voltage transmitter of claim 1, wherein the n-channel field effect unit Q1 comprises an n-channel field effect transistor, a diode is connected between a drain and a source of the n-channel field effect transistor, a port of the diode near the drain is a cathode, a source of the n-channel field effect transistor is connected to a cathode of the input source, a drain of the n-channel field effect transistor is connected to a cathode of a diode D1, and a gate of the n-channel field effect transistor is connected to the MCU main control chip.
3. The intelligent single-port multiplexing-type current-voltage transmitter of claim 1, wherein a resistor R7 is connected between the negative input terminal of the operational amplifier and a reference voltage REF _ 10V.
4. The intelligent single-port multiplexing-type current-voltage transmitter of claim 1, wherein the negative terminal of the input source is grounded.
5. The intelligent single-port multiplexing-type current-voltage transmitter of claim 1, wherein the input source inputs 0-20 mA direct current or-10V- +10V direct current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021453533.2U CN212692901U (en) | 2020-07-21 | 2020-07-21 | Intelligent single-port multiplexing type current voltage transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021453533.2U CN212692901U (en) | 2020-07-21 | 2020-07-21 | Intelligent single-port multiplexing type current voltage transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212692901U true CN212692901U (en) | 2021-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021453533.2U Active CN212692901U (en) | 2020-07-21 | 2020-07-21 | Intelligent single-port multiplexing type current voltage transmitter |
Country Status (1)
| Country | Link |
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| CN (1) | CN212692901U (en) |
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2020
- 2020-07-21 CN CN202021453533.2U patent/CN212692901U/en active Active
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