CN213027961U - Input circuit suitable for receiving various meteorological sensor signals - Google Patents
Input circuit suitable for receiving various meteorological sensor signals Download PDFInfo
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- CN213027961U CN213027961U CN202021974843.9U CN202021974843U CN213027961U CN 213027961 U CN213027961 U CN 213027961U CN 202021974843 U CN202021974843 U CN 202021974843U CN 213027961 U CN213027961 U CN 213027961U
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Abstract
The utility model relates to an input circuit suitable for receiving various meteorological sensor signals, which comprises a plurality of protection circuits, a selection circuit, a digital signal processing circuit and an analog signal processing circuit; the input end of each protection circuit is connected with an input signal of a meteorological sensor; the selection circuit is a multiplexer; the output terminal of each protection circuit is connected to one signal input terminal of the multiplexer. The utility model discloses a circuit has been used, a plurality of sensors can be connected simultaneously to do preliminary treatment to multiple sensor signal, make it all can be calculated etc. by subsequent operation chip, it is more convenient to use. The method is particularly suitable for fields such as meteorology and the like which need to monitor the detection data of various sensors at the same time.
Description
Technical Field
The utility model relates to an electronic circuit field, concretely relates to input circuit suitable for receive multiple meteorological sensor signal.
Background
In the course of performing meteorological measurements, it may be necessary to process the detection data of various meteorological sensors, such as temperature sensors, humidity sensors, wind speed sensors, water sensors, air pressure sensors, and the like. The principles of the various sensors are different, some sensors have a resistor inside, and during measurement, the resistance value of the resistor changes and reflects the change of the voltage at two ends of the resistor, and the output quantity of the resistor is an analog quantity of the voltage change; some of the devices are internally provided with a switching device, when the measured data meets the switching-off condition, the switching device is switched off and outputs signals, and the output quantity of the signals is pulse signals; there are sensors of the frequency type that read time data by detecting the rising and falling edges of a signal. The output data of various sensors are all input to an operation chip for calculation and processing, but in the prior art, each sensor needs a single circuit to perform preliminary processing on the detection data, which is cumbersome.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model discloses an input circuit suitable for receive multiple meteorological sensor signal.
The utility model discloses the technical scheme who adopts as follows:
an input circuit suitable for receiving signals of a plurality of meteorological sensors comprises a plurality of protection circuits, a selection circuit, a digital signal processing circuit and an analog signal processing circuit; the input end of each protection circuit is connected with an input signal of a meteorological sensor; the selection circuit is a multiplexer; the output end of each protection circuit is connected with one signal input end of the multiplexer;
the digital signal processing circuit comprises a first operational amplifier; the first end of the first resistor is connected with a voltage source; the second end of the first resistor is connected with the non-inverting input end of the first operational amplifier; the first end of the second resistor is connected with the output end of the first operational amplifier; the second end of the second resistor is connected with the non-inverting input end of the second resistor; the first end of the third resistor is connected with the non-inverting input end of the first operational amplifier; the second end of the third resistor is grounded; the signal output end of the multiplexer is connected with the inverting input end of the first operational amplifier; the output end of the first operational amplifier is used as a first signal output end of the input circuit for receiving the signals of the various meteorological sensors;
the analog signal processing circuit comprises a second operational amplifier; the first end of the fourth resistor is connected with the inverting input end of the second operational amplifier; the second end of the fourth resistor is connected with the output end of the second operational amplifier; the signal output end of the multiplexer is connected with the non-inverting input end of the second operational amplifier; the output end of the second operational amplifier is used as a second signal output end of the input circuit for receiving the signals of the various meteorological sensors.
The further technical scheme is as follows: the protection circuit includes a pull-up circuit; the pull-up circuit comprises a fifth resistor and a first diode; the first end of the fifth resistor is connected with the signal input end of the meteorological sensor; the second end of the fifth resistor is connected with the cathode of the first diode; the anode of the first diode is connected with a pull-up power supply.
The further technical scheme is as follows: the protection circuit comprises a second diode, a first capacitor, a second capacitor and a sixth resistor; the anode of the second diode is grounded, and the cathode of the second diode is connected with the signal input end of the meteorological sensor; the first capacitor is connected in parallel with two ends of the second diode; the first end of the sixth resistor is connected with the cathode of the second diode; the second end of the sixth resistor is connected with the first end of the second capacitor; the second end of the second capacitor is grounded.
The further technical scheme is as follows: the protection circuit further comprises a diode pair; the diode pair comprises a third diode and a fourth diode; the third diode and the fourth diode are connected in series, and the output end of each protection circuit is connected to the common end of the third diode and the fourth diode and then connected to one signal input end of the multiplexer.
The further technical scheme is as follows: and the output end of the analog signal processing circuit is connected with an analog-to-digital conversion circuit.
The utility model has the advantages as follows:
the utility model discloses a circuit has been used, a plurality of sensors can be connected simultaneously to do preliminary treatment to multiple sensor signal, make it all can be calculated etc. by subsequent operation chip, it is more convenient to use. The method is particularly suitable for fields such as meteorology and the like which need to monitor the detection data of various sensors at the same time.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the present invention.
In the figure: 1. a first diode; 2. a fifth resistor; 3. a second diode; 4. a first capacitor; 5. a second capacitor; 6. a sixth resistor; 7. a third diode; 8. a fourth diode; 9. a multiplexer; 10. a second operational amplifier; 11. a fourth resistor; 12. a first resistor; 13. a second resistor; 14. a first operational amplifier; 15. a third resistor; 16. and an operation chip.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
Fig. 1 is a schematic diagram of an embodiment of the present invention. Fig. 1 shows a protection circuit. In practical use, when there are a plurality of sensors, a plurality of protection circuits should be provided correspondingly.
As shown in FIG. 1, an input circuit adapted to receive a variety of meteorological sensor signals includes a plurality of protection circuits, a selection circuit, a digital signal processing circuit, and an analog signal processing circuit.
The protection circuit is used for protecting the back-end circuit from being influenced by abnormal input signals. The selection circuit is used for selecting one signal to be processed when a plurality of meteorological sensor input signals exist. The digital signal processing circuit and the analog signal processing circuit are respectively used for processing different kinds of sensor signals.
The input end of each protection circuit is connected with the input signal of a meteorological sensor.
The protection circuit includes a pull-up circuit. The pull-up circuit comprises a fifth resistor 2 and a first diode 1. The first end of the fifth resistor 2 is connected with the signal input end of the meteorological sensor. The pull-up circuit plays an anti-interference role, when the sensor does not output data, the fifth resistor 2 can enable the input end of the subsequent selection circuit to be in a high level state stably, and the selection circuit is prevented from generating misoperation due to possible low level interference.
A second terminal of the fifth resistor 2 is connected to the cathode of the first diode 1. The anode of the first diode 1 is connected to a pull-up power supply. The protection circuit comprises a second diode 3, a first capacitor 4, a second capacitor 5 and a sixth resistor 6. The anode of the second diode 3 is grounded, and the cathode is connected with the signal input end of the meteorological sensor. The first capacitor 4 is connected in parallel to two ends of the second diode 3. A first end of the sixth resistor 6 is connected to the cathode of the second diode 3. A second terminal of the sixth resistor 6 is connected to a first terminal of the second capacitor 5. The second terminal of the second capacitor 5 is connected to ground. The second diode 3 is a zener diode and is therefore connected in the opposite direction to the signal input of the weather sensor. The first capacitor 4 and the second capacitor 5 make the voltage stabilizing effect smoother.
The protection circuit further includes a diode pair. The diode pair includes a third diode 7 and a fourth diode 8. The third diode 7 and the fourth diode 8 are connected in series, and the output terminal of each protection circuit is connected to the common terminal of the third diode 7 and the fourth diode 8 and then connected to a signal input terminal of the multiplexer 9. When the input signal is far lower than the forward conduction voltage of the diode, the diode does not work, and when the input signal exceeds the forward conduction voltage of the diode, the diode is conducted, at the moment, the input signal is clamped at the conduction voltage of the diode, and a rear-stage circuit can be protected. Since the signals passed by the circuit are signals from various sensors, including switch-type sensors that output signals as pulse width modulated data, measured by capturing the rise and fall edge times of the data stream, which may be positive or negative, a pair of diodes are connected and the voltage at which the diodes conduct is adjusted by adjusting the values of V2 and V3.
The selection circuit is a multiplexer 9. The output of each protection circuit is connected to a signal input of the multiplexer 9. The multiplexer 9 is a chip common in the circuit field, and a commercially available product can be directly used.
The digital signal processing circuit comprises a first operational amplifier 14. A first terminal of the first resistor 12 is connected to a voltage source. A second terminal of the first resistor 12 is connected to a non-inverting input terminal of the first operational amplifier 14. A first terminal of the second resistor 13 is connected to an output terminal of the first operational amplifier 14. The second end of the second resistor 13 is connected to the non-inverting input terminal of the second resistor 13. A first terminal of the third resistor 15 is connected to the non-inverting input terminal of the first operational amplifier 14. The second terminal of the third resistor 15 is connected to ground. The signal output of the multiplexer 9 is connected to the inverting input of the first operational amplifier 14. The output of the first operational amplifier 14 serves as a first signal output of the input circuit for receiving the various weather sensor signals. The digital signal processing circuit forms a Schmitt trigger of a single power supply system, and a pull-up resistor first resistor 12 is added on the basis of an anti-phase Schmitt trigger to lift the threshold voltage of a same-phase end. The digital signal processing circuit can process the output signal of the frequency type sensor or the output signal of the switch type sensor into more regular digital signal data for subsequent circuit processing.
The analog signal processing circuit comprises a second operational amplifier 10. A first terminal of the fourth resistor 11 is connected to the inverting input terminal of the second operational amplifier 10. A second terminal of the fourth resistor 11 is connected to the output terminal of the second operational amplifier 10. The signal output terminal of the multiplexer 9 is connected to the non-inverting input terminal of the second operational amplifier 10. The output of the second operational amplifier 10 serves as a second signal output of the input circuit for receiving the various weather sensor signals. The analog signal processing circuit essentially constitutes a voltage follower in which the resistance value of the fourth resistor 11 is set sufficiently small. The analog signal processing circuit is used for isolating the influence between the front-stage circuit and the rear-stage circuit so as to conveniently connect an analog-to-digital converter and the like. The analog signal processing circuit is used for processing the resistance type sensor of which the output data is the voltage to ground.
An analog-to-digital conversion circuit may be further connected at the output of the analog signal processing circuit. And converting the analog signal output by the sensor into a digital signal so as to be processed by a subsequent operation chip and the like.
As shown in fig. 1, an operation chip 16 may be additionally provided to be used in conjunction with the input circuit adapted to receive various weather sensor signals as shown in the present invention. For example, the address selection terminal of the multiplexer 9 can be connected through a general input/output port of the operation chip 16, and the operation chip 16 selects which input terminal of the input signal is output by the output terminal of the multiplexer 9 by changing the high/low level of the output port, so as to process the corresponding sensor output signal in a targeted manner. The data of the first signal output end and the second signal output end can be received and processed through the operation chip 16. These are not the protection contents of the present invention, and are not described again.
The above description is for the purpose of explanation and not limitation of the invention, which is defined in the claims, and any modifications may be made without departing from the basic structure of the invention.
Claims (5)
1. An input circuit adapted to receive a plurality of meteorological sensor signals, comprising: the circuit comprises a plurality of protection circuits, a selection circuit, a digital signal processing circuit and an analog signal processing circuit; the input end of each protection circuit is connected with an input signal of a meteorological sensor; the selection circuit is a multiplexer (9); the output end of each protection circuit is connected with one signal input end of the multiplexer (9);
the digital signal processing circuit comprises a first operational amplifier (14); the first end of the first resistor (12) is connected with a voltage source; the second end of the first resistor (12) is connected with the non-inverting input end of the first operational amplifier (14); the first end of the second resistor (13) is connected with the output end of the first operational amplifier (14); the second end of the second resistor (13) is connected with the non-inverting input end of the second resistor (13); the first end of the third resistor (15) is connected with the non-inverting input end of the first operational amplifier (14); the second end of the third resistor (15) is grounded; the signal output end of the multiplexer (9) is connected with the inverting input end of the first operational amplifier (14); the output end of the first operational amplifier (14) is used as the first signal output end of the input circuit for receiving the signals of the various meteorological sensors;
the analog signal processing circuit comprises a second operational amplifier (10); the first end of the fourth resistor (11) is connected with the inverting input end of the second operational amplifier (10); the second end of the fourth resistor (11) is connected with the output end of the second operational amplifier (10); the signal output end of the multiplexer (9) is connected with the non-inverting input end of the second operational amplifier (10); the output of the second operational amplifier (10) serves as a second signal output of the input circuit for receiving the plurality of weather sensor signals.
2. The input circuit adapted to receive a plurality of weather sensor signals as set forth in claim 1, wherein: the protection circuit includes a pull-up circuit; the pull-up circuit comprises a fifth resistor (2) and a first diode (1); the first end of the fifth resistor (2) is connected with the signal input end of the meteorological sensor; the second end of the fifth resistor (2) is connected with the cathode of the first diode (1); the anode of the first diode (1) is connected with a pull-up power supply.
3. The input circuit adapted to receive a plurality of weather sensor signals as set forth in claim 1, wherein: the protection circuit comprises a second diode (3), a first capacitor (4), a second capacitor (5) and a sixth resistor (6); the anode of the second diode (3) is grounded, and the cathode of the second diode is connected with the signal input end of the meteorological sensor; the first capacitor (4) is connected in parallel with two ends of the second diode (3); the first end of the sixth resistor (6) is connected with the cathode of the second diode (3); the second end of the sixth resistor (6) is connected with the first end of the second capacitor (5); the second end of the second capacitor (5) is grounded.
4. The input circuit adapted to receive a plurality of weather sensor signals as set forth in claim 1, wherein: the protection circuit further comprises a diode pair; the diode pair comprises a third diode (7) and a fourth diode (8); the third diode (7) and the fourth diode (8) are connected in series, and the output end of each protection circuit is connected to the common end of the third diode (7) and the fourth diode (8) and then connected to one signal input end of the multiplexer (9).
5. The input circuit adapted to receive a plurality of weather sensor signals as set forth in claim 1, wherein: and the output end of the analog signal processing circuit is connected with an analog-to-digital conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021974843.9U CN213027961U (en) | 2020-09-10 | 2020-09-10 | Input circuit suitable for receiving various meteorological sensor signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021974843.9U CN213027961U (en) | 2020-09-10 | 2020-09-10 | Input circuit suitable for receiving various meteorological sensor signals |
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| Publication Number | Publication Date |
|---|---|
| CN213027961U true CN213027961U (en) | 2021-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021974843.9U Active CN213027961U (en) | 2020-09-10 | 2020-09-10 | Input circuit suitable for receiving various meteorological sensor signals |
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| Country | Link |
|---|---|
| CN (1) | CN213027961U (en) |
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- 2020-09-10 CN CN202021974843.9U patent/CN213027961U/en active Active
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