CN211123726U - Analog input acquisition circuit - Google Patents
Analog input acquisition circuit Download PDFInfo
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- CN211123726U CN211123726U CN202020266967.5U CN202020266967U CN211123726U CN 211123726 U CN211123726 U CN 211123726U CN 202020266967 U CN202020266967 U CN 202020266967U CN 211123726 U CN211123726 U CN 211123726U
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Abstract
The utility model relates to a circuit especially relates to an analog input acquisition circuit. In the circuit, a jumper resistor and a current acquisition resistor are set as a group, and the jumper resistor and the current acquisition resistor are simultaneously disconnected in a voltage input mode, so that a voltage signal of a current-limiting resistor can be acquired; the first detachable resistor and the second detachable resistor are in one group, and the first detachable resistor and the second detachable resistor are disconnected simultaneously in a current input mode, so that a current signal of the current limiting resistor is collected. The circuit can realize the switching between current input and voltage input by changing the resistance value of the resistor at any time according to the requirement.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a circuit especially relates to an analog input acquisition circuit.
[ background of the invention ]
In the industrial field, voltage and current acquisition, current detection when a motor operates, current detection of high-power heating equipment, power supply voltage detection and total current detection of a distribution box are frequently used; the temperature detection, the humidity detection, the water flow detection, the position angle detection and other detections can be converted into analog quantity signals to realize the detection.
for example, a temperature transmitter, an alternating/direct current transmitter, a humidity transmitter, an electronic ruler and the like can output quantized signals of 0-20 mA/4-20 mA/0-5V/1-5V/0-10V and the like, no matter which form, an analog quantity detection acquisition module is needed to convert the signals into digital signals P L C for centralized processing, the traditional analog quantity signal acquisition circuit can only singly realize current signal acquisition or voltage signal acquisition, and therefore, the analog quantity input acquisition circuit which can realize the switching between current input and voltage input by changing the resistance value of a resistor is necessary to be provided.
[ summary of the invention ]
The utility model aims to solve the above problems and provide an analog input acquisition circuit, in the circuit jumper resistance R1 and current acquisition resistance R5 are set as a group, under the voltage input mode, jumper resistance R1 and current acquisition resistance R5 are disconnected simultaneously, thereby the voltage distributed by the resistance voltage dividing network can be acquired, and the input voltage is directly obtained through MCU operation; the first detachable resistor R3 and the second detachable resistor R4 are combined, and in a current input mode, the first detachable resistor R3 and the second detachable resistor R4 are simultaneously disconnected, so that a voltage signal passing through the current limiting resistor is collected and converted into a final input current signal. The switching between current input/voltage input is realized by changing the resistance value and the jumper of the resistor at any time according to the requirement.
IN order to achieve the above object, the utility model discloses an analog input acquisition circuit, including an input IN and an output OUT, input IN and output OUT between be provided with first node 10, between input IN and the first node 10 parallelly connected have jumper resistance R1 and first demountable resistance R3, still be provided with simulation ground end AGND, between first node 10 and the simulation ground end AGND parallelly connected have second demountable resistance R4 and current collection resistance R5, output OUT is connected with first node 10 through current limiting resistance R2; a high-frequency filter capacitor C1 and a diode D1 are connected between the first node 10 and the analog ground end AGND in parallel; the jumper resistor R1 and the current acquisition resistor R5 are in a group, and the jumper resistor R1 and the current acquisition resistor R5 are simultaneously disconnected in a voltage input mode; the first detachable resistor R3 and the second detachable resistor R4 form a group, and the first detachable resistor R3 and the second detachable resistor R4 are simultaneously disconnected in a current input mode.
Furthermore, the high-frequency filter capacitor C1 filters high-frequency noise and noise in the circuit, and the diode D1 is a common diode for preventing reverse connection of signals.
Furthermore, the jumper resistor R1 is a 0 ohm jumper resistor, and the current collecting resistor R5 is a 120 ohm shunt resistor.
The utility model provides an analog input acquisition circuit, in which a jumper resistor and a current acquisition resistor are set as a group, and the jumper resistor and the current acquisition resistor are simultaneously disconnected in a voltage input mode, so that a voltage signal of a voltage division network can be acquired; the first detachable resistor and the second detachable resistor are combined into a group, and the first detachable resistor and the second detachable resistor are disconnected simultaneously in a current input mode, so that voltage signals of the current-limiting resistor are collected, and final input current signals can be calculated. The switching between current input and voltage input can be realized by changing the resistance value of the resistor at any time according to requirements.
[ description of the drawings ]
Fig. 1 is a schematic structural diagram of the present invention.
[ detailed description ] embodiments
The following examples are further to explain and supplement the present invention, and do not constitute any limitation to the present invention.
Example 1
As shown IN fig. 1, the analog input acquisition circuit of this embodiment includes an input end IN and an output end OUT, where a first node 10 is disposed between the input end IN and the output end OUT, a jumper resistor R1 and a first detachable resistor R3 are connected IN parallel between the input end IN and the first node 10, and an analog ground end AGND is further disposed, a second detachable resistor R4 and a current acquisition resistor R5 are connected IN parallel between the first node 10 and the analog ground end AGND, and the output end OUT is connected to the first node 10 through a current limiting resistor R2; a high-frequency filter capacitor C1 and a diode D1 are connected between the first node 10 and the analog ground end AGND in parallel; the jumper resistor R1 and the current acquisition resistor R5 are in a group, and the jumper resistor R1 and the current acquisition resistor R5 are simultaneously disconnected in a voltage input mode; the first detachable resistor R3 and the second detachable resistor R4 form a group, and the first detachable resistor R3 and the second detachable resistor R4 are simultaneously disconnected in a current input mode. The high-frequency filter capacitor C1 filters high-frequency noise and noise in the circuit, and the diode D1 is a common diode for preventing the reverse connection of signals. The jumper resistor R1 is a 0 ohm jumper resistor, and the current collecting resistor R5 is a 120 ohm shunt resistor.
Under the voltage input state, the jumper resistor R1 and the current acquisition resistor R5 are simultaneously disconnected, then the first detachable resistor R3 and the second detachable resistor R4 form a resistor voltage division network, the input voltage is subjected to voltage division processing, and the voltage output to the current limiting resistor R2 is controlled in the range of 0-2.5V so as to be used by a circuit at the back. The purpose of collecting higher voltage or lower voltage can be achieved by changing the resistance values of the first detachable resistor R3 and the second detachable resistor R4. The diode D1 in fig. one is a normal diode, and it forms an anti-reverse connection circuit with the jumper resistor R1 or the first detachable resistor R3, when the input polarity is correct, the circuit still works normally because the reverse cut-off characteristic of the diode D1 can not make the diode D1 conduct either current signal or voltage signal. If the polarity of the input signal is reversed, since the diode D1 is turned on in the forward direction, the input signal will return to the input source through the diode D1 and the jumper resistor R1 or the first detachable resistor R3, thereby protecting the following input circuit.
Under the current input state, the first detachable resistor R3 and the second detachable resistor R4 are simultaneously disconnected, the jumper resistor R1 is a 0-ohm jumper resistor, and the current collection resistor R5 is a 120-ohm shunt resistor, so that when a current signal arrives at an input end IN point, current can directly flow into the current collection resistor R5 from the jumper resistor R1, voltage can be generated at a first node at the moment, the voltage at the point is IN direct proportion to the size of the input current, and the larger the input current is, the larger the voltage at the node is. The circuit can adapt to current signals of various voltage inputs.
Although the present invention has been described in connection with the above embodiments, the scope of the present invention is not limited thereto, and modifications, replacements, and the like to the above members are all within the scope of the claims of the present invention without departing from the concept of the present invention.
Claims (3)
1. An analog input acquisition circuit comprises an input end IN and an output end OUT, and is characterized IN that: a first node (10) is arranged between the input end IN and the output end OUT, a jumper resistor R1 and a first detachable resistor R3 are connected IN parallel between the input end IN and the first node (10), an analog ground end AGND is also arranged, a second detachable resistor R4 and a current collecting resistor R5 are connected IN parallel between the first node (10) and the analog ground end AGND, and the output end OUT is connected with the first node (10) through a current limiting resistor R2; a high-frequency filter capacitor C1 and a diode D1 are connected between the first node (10) and the analog ground end AGND in parallel;
The jumper resistor R1 and the current acquisition resistor R5 are in a group, and the jumper resistor R1 and the current acquisition resistor R5 are simultaneously disconnected in a voltage input mode; the first detachable resistor R3 and the second detachable resistor R4 form a group, and the first detachable resistor R3 and the second detachable resistor R4 are simultaneously disconnected in a current input mode.
2. An analog input acquisition circuit as claimed in claim 1, wherein: the high-frequency filter capacitor C1 filters high-frequency noise and noise in the circuit, and the diode D1 is a common diode for preventing the reverse connection of signals.
3. An analog input acquisition circuit as claimed in claim 2, wherein: the jumper resistor R1 is a 0 ohm jumper resistor, and the current collecting resistor R5 is a 120 ohm shunt resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020266967.5U CN211123726U (en) | 2020-03-06 | 2020-03-06 | Analog input acquisition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020266967.5U CN211123726U (en) | 2020-03-06 | 2020-03-06 | Analog input acquisition circuit |
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| CN211123726U true CN211123726U (en) | 2020-07-28 |
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| CN202020266967.5U Active CN211123726U (en) | 2020-03-06 | 2020-03-06 | Analog input acquisition circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505398A (en) * | 2020-12-15 | 2021-03-16 | 杭州和利时自动化有限公司 | AI device and system |
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2020
- 2020-03-06 CN CN202020266967.5U patent/CN211123726U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505398A (en) * | 2020-12-15 | 2021-03-16 | 杭州和利时自动化有限公司 | AI device and system |
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