CN218330352U - Sensor circuit based on data processing chip - Google Patents
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- CN218330352U CN218330352U CN202222328603.7U CN202222328603U CN218330352U CN 218330352 U CN218330352 U CN 218330352U CN 202222328603 U CN202222328603 U CN 202222328603U CN 218330352 U CN218330352 U CN 218330352U
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Abstract
The utility model discloses a sensor circuit based on data processing chip mainly solves the problem that current sensor detectivity is low, the detection precision is not high. The circuit comprises a pressure-sensitive element for acquiring a pressure signal, a sampling and holding circuit connected with the pressure-sensitive element for sampling and holding the acquired pressure signal, a low-pass filter connected with the sampling and holding circuit, a sensitivity control circuit connected with the low-pass filter, a clock pulse circuit and a sampling decision circuit connected with the sensitivity control circuit. Through the design, the utility model discloses can promote sensor circuit's clock control precision to make the control of switch tube more accurate reliable in the data processing chip, reduce the bias current that the analog signal that pressure sensitive element gathered produced when handling in the data processing chip, thereby improve the detectivity and the detection precision of whole sensor. Therefore, the method is suitable for popularization and application.
Description
Technical Field
The utility model relates to a sensor circuit, specifically speaking relates to a sensor circuit based on data processing chip.
Background
The pressure sensor is the most common sensor in industrial practice, is widely applied to various industrial automatic control environments, and relates to industries such as production automatic control, electric power, water conservancy and hydropower, pipelines and the like. A device or apparatus that senses the pressure signal and converts the pressure signal into a usable output electrical signal according to a predetermined rule.
However, after the related signals are collected by the conventional pressure sensor, when the collected analog signals are processed, because the delay control of the switching tube in the data processing chip is not accurate, stepped bias current is generated when the analog signals pass through the operational amplifier, and when the bias current is supplied to the data processing chip, the current signals passing through the data processing chip are attenuated in proportion to the bias current, so that the detection sensitivity of the sensor is reduced, and the detection accuracy of the sensor is not high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a sensor circuit based on data processing chip mainly solves the problem that current sensor detectivity is low, the detection precision is not high.
In order to achieve the above object, the utility model adopts the following technical scheme:
a sensor circuit based on a data processing chip comprises a pressure-sensitive element for collecting pressure signals, a sample-and-hold circuit connected with the pressure-sensitive element and used for sampling and holding the collected pressure signals, a low-pass filter connected with the sample-and-hold circuit, a sensitivity control circuit connected with the low-pass filter, a clock pulse circuit and a sampling decision circuit connected with the sensitivity control circuit; the sensitivity control circuit comprises a time base chip U1 with the model of NE555, an electrolytic capacitor C1 with the anode connected with the 1 st pin of the time base chip U1 and the cathode grounded, a resistor R1 connected with the 1 st pin of the time base chip U1, a capacitor C2 with one end connected with the other end of the resistor R1 and the 2 nd pin of the time base chip U1 and the other end grounded, a capacitor C3 with one end connected with the 5 th pin of the time base chip U1 and the other end grounded, resistors R2 and R3 connected with the 3 rd pin of the time base chip U1, a capacitor C4 connected between the other end of the resistor R2 and the other end of the resistor R3, a resistor R4 and a capacitor C5 with one end connected with the 4 th pin of the time base chip U1 and the other end grounded after being connected in parallel, the time base chip comprises a resistor R5 connected between a 4 th pin and a 7 th pin of a time base chip U1, a resistor R6 connected between a 6 th pin and an 8 th pin of the time base chip U1, an inductor L1 connected with the 6 th pin of the time base chip U1, a diode D1 of which the negative electrode is connected with a2 nd pin of the time base chip U1 and the positive electrode is connected with the other end of the inductor L1 through the resistor R7, a diode D2 of which the positive electrode is connected with the other end of the inductor L1 and the negative electrode is connected with the common end of the resistor R3 and the capacitor C4, a diode D3 of which the negative electrode is connected with the 8 th pin of the time base chip U1 and the positive electrode is connected with a sampling judgment circuit, an electrolytic capacitor C6 of which the positive electrode is connected with the positive electrode of the diode D2 and the negative electrode is grounded, and a resistor R8 connected with two ends of the electrolytic capacitor C6 in parallel; the anode of the diode D4 is connected with the output end of the low-pass filter, and the cathode of the diode D4 is connected with the No. 1 pin of the time-base chip U1; the common end of the resistor R2 and the capacitor C4 is connected with the grounding end of the capacitor C2, and the 1 st pin and the 8 th pin of the time-base chip U1 are connected with the clock pulse circuit.
Further, in the present invention, the sample-and-hold circuit includes a chip U2 of AD590 type, a resistor R8 connected to a V-pin of the chip U2, a resistor R9 and a resistor R10 both connected to the other end of the resistor R8, an electrolytic capacitor C7 having an anode connected to the resistor R10 and a cathode grounded, an amplifier A1 having a non-inverting input connected to the anode of the electrolytic capacitor C7, a varistor R11 having a fixed end connected to the non-inverting input of the amplifier A1 and the other end grounded, an amplifier A2 having a non-inverting input connected to the free end of the varistor R11, a resistor R12 having one end connected to the inverting input and the output of the amplifier A1 and the other end connected to the inverting input of the amplifier A2, and a resistor R13 having one end connected to the inverting input of the amplifier A2 and the other end connected to the output of the amplifier A2; the voltage source control circuit comprises a chip U2, a resistor R9, a low-pass filter, a pressure sensor and a CAN pin, wherein the V + pin of the chip U2 is connected with the anode of a 12V voltage source, the other end of the resistor R9 is connected with the cathode of the 12V voltage source, the other end of the resistor R10 is grounded, the positive and negative power supply ends of the amplifier A2 are correspondingly connected with the anode and the cathode of the 12V voltage source, the output end of the amplifier A2 is connected with the low-pass filter, and the CAN pin of the chip U2 is connected with the output end of the pressure sensor.
Further, in the utility model discloses in, clock pulse circuit is including connecting crystal oscillator RX1 between time base chip U1's the 1 st and 8 th pins, and one end links to each other and the electric capacity C8 of other end ground connection with one of them crystal oscillator pin of signal transceiver chip to and one end links to each other and the electric capacity C9 of other end ground connection with another crystal oscillator pin of signal transceiver chip.
Further, in the utility model discloses in, the sampling decision circuit includes the resistance R14 that links to each other with diode D3's in the sensitivity control circuit negative pole, the anodal resistance R14 other end links to each other, diode D5 that diode D3's in negative pole and the sensitivity control circuit negative pole links to each other, link to each other and the electric capacity C10 of other end ground connection with diode D5's positive pole, establish ties back one end and diode D5's positive pole and link to each other and the resistance R15 of other end ground connection, R16, the base links to each other with resistance R15, the R16 public end, the triode Q1 of projecting pole ground connection, and one end links to each other and the resistance R17 that the other end links to each other with external power supply VCC end with triode Q1's collecting electrode.
Further, in the present invention, the model of the low pass filter is LFCN-3800+.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) The utility model discloses a improve sensor circuit structure, through setting up sensitivity control circuit, utilize the accurate time delay or the oscillation of the production of NE555 chip, can promote sensor circuit's clock control precision to make the control of switch tube more accurate reliable in the data processing chip, the bias current that produces when the analog signal that reduces pressure-sensitive element and gather handles in the data processing chip, thereby improve the detectivity and the detection precision of whole sensor.
(2) The utility model discloses circuit structure is simple, with low costs, and the conventional easy realization of circuit configuration is suitable for popularization and application.
Drawings
Fig. 1 is a schematic diagram of a sensitivity control circuit and a clock circuit in the present invention.
Fig. 2 is a schematic circuit diagram of a sample-and-hold circuit according to the present invention.
Fig. 3 is a schematic circuit diagram of a sampling decision circuit according to the present invention.
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.
Examples
The utility model discloses a sensor circuit based on data processing chip, including the pressure sensitive element who is used for gathering pressure signal, the sample hold circuit who is used for carrying out the sample hold to the pressure signal of gathering links to each other with pressure sensitive element, the low pass filter who links to each other with the sample hold circuit, the sensitivity control circuit who links to each other with low pass filter to and the clock pulse circuit and the sampling decision circuit who link to each other with sensitivity control circuit. Wherein the model of the low-pass filter is LFCN-3800+. The sensor circuit firstly converts collected pressure information into an analog signal for transmission by using a pressure-sensitive element, a sampling holding circuit tracks and holds a level value of the collected analog signal, the analog signal is filtered by a low-pass filter and then is input into a value sensitivity control circuit, and under the synergistic action of a clock pulse circuit and a sampling judgment circuit, the accurate time delay or oscillation generated by the sensitivity control circuit is utilized, so that the clock control precision of the sensor circuit can be improved, the control of a switching tube in a data processing chip is more accurate and reliable, the processing of the analog signal in a subsequent data processing chip is more efficient, and the precision of the whole sensor is improved.
As shown in fig. 1, the sensitivity control circuit includes a time-base chip U1 with a model of NE555, an electrolytic capacitor C1 with a positive electrode connected to the 1 st pin of the time-base chip U1 and a negative electrode grounded, a resistor R1 connected to the 1 st pin of the time-base chip U1, a capacitor C2 with one end connected to the other end of the resistor R1 and the 2 nd pin of the time-base chip U1 and the other end grounded, a capacitor C3 with one end connected to the 5 th pin of the time-base chip U1 and the other end grounded, resistors R2 and R3 connected to the 3 rd pin of the time-base chip U1, a capacitor C4 connected between the other end of the resistor R2 and the other end of the resistor R3, a resistor R4 and a capacitor C5 with one end connected to the 4 th pin of the time-base chip U1 and the other end grounded after being connected in parallel, a resistor R6 connected between the 6 th pin and the 8 th pin of the time-base chip U1, a resistor L1 connected to the 6 th pin of the time-base chip U1, a negative electrode connected to the second pin of the time-base chip U1 and the second pin of the time-base chip U1, a resistor R2 connected to the anode of the capacitor C2 and the capacitor C3, and the anode of the capacitor C2 connected to the anode of the capacitor C2 of the time-base chip U1, and the capacitor C2 connected to the diode connected in parallel with the diode, and the diode connected to the anode of the diode connected to the capacitor C2, and the diode of the diode connected to the diode, and the diode connected to the anode of the capacitor C2 of the diode connected to the capacitor C3, and the diode connected in parallel; the anode of the diode D4 is connected with the output end of the low-pass filter, and the cathode of the diode D4 is connected with the No. 1 pin of the time-base chip U1; the common end of the resistor R2 and the capacitor C4 is connected with the grounding end of the capacitor C2, and the 1 st pin and the 8 th pin of the time-base chip U1 are connected with the clock pulse circuit. The partial circuit mainly utilizes the accurate time delay or oscillation generated by the NE555 chip, and can improve the clock control precision of the sensor circuit, so that the control of a switching tube in the data processing chip is more accurate and reliable.
As shown in fig. 2, the sample-and-hold circuit includes a chip U2 with a model AD590, a resistor R8 connected to a V-pin of the chip U2, a resistor R9 and a resistor R10 both connected to the other end of the resistor R8, an electrolytic capacitor C7 with an anode connected to the resistor R10 and a cathode grounded, an amplifier A1 with a non-inverting input connected to the anode of the electrolytic capacitor C7, a varistor R11 with one fixed end connected to the non-inverting input of the amplifier A1 and the other fixed end grounded, an amplifier A2 with a non-inverting input connected to the free end of the varistor R11, a resistor R12 with one end connected to both the inverting input and the output of the amplifier A1 and the other end connected to the inverting input of the amplifier A2, and a resistor R13 with one end connected to the inverting input of the amplifier A2 and the other end connected to the output of the amplifier A2; the V + pin of the chip U2 is connected with the anode of a 12V voltage source, the other end of the resistor R9 is connected with the cathode of the 12V voltage source, the other end of the resistor R10 is grounded, the positive and negative power supply ends of the amplifier A2 are correspondingly connected with the anode and the cathode of the 12V voltage source, the output end of the amplifier A2 is connected with the low-pass filter, and the CAN pin of the chip U2 is connected with the output end of the pressure sensor. The sampling holding circuit is mainly used for tracking and holding the level value of the acquired analog signal.
As shown in fig. 1, the clock pulse circuit includes a crystal oscillator RX1 connected between the 1 st and 8 th pins of the time-base chip U1, a capacitor C8 with one end connected to one of the crystal oscillator pins of the signal transceiver chip and the other end grounded, and a capacitor C9 with one end connected to the other crystal oscillator pin of the signal transceiver chip and the other end grounded. The clock pulse circuit is mainly used for generating clock pulse and controlling the working time sequence of the circuit.
As shown in fig. 3, the sampling decision circuit includes a resistor R14 connected to the negative electrode of the diode D3 in the sensitivity control circuit, a diode D5 having an anode connected to the other end of the resistor R14 and a cathode connected to the negative electrode of the diode D3 in the sensitivity control circuit, a capacitor C10 connected to the anode of the diode D5 and having the other end grounded, resistors R15 and R16 having one end connected to the anode of the diode D5 and the other end grounded after being connected in series, a transistor Q1 having a base connected to the common terminal of the resistors R15 and R16 and an emitter grounded, and a resistor R17 having one end connected to the collector of the transistor Q1 and the other end connected to the VCC terminal of the external power supply. The sampling decision circuit is mainly used for carrying out sampling decision with a certain rule on the output waveform of the received signal in time sequence control to obtain a received digital signal.
Through the design, the utility model discloses can promote sensor circuit's clock control precision to make the control of switch tube more accurate reliable in the data processing chip, reduce the bias current that the analog signal that pressure sensitive element gathered produced when handling in the data processing chip, thereby improve the detectivity and the detection precision of whole sensor. Therefore, compared with the prior art, the utility model has the substantive characteristics and progress.
The above embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the protection scope of the present invention, but all the insubstantial changes or color modifications made in the main body design concept and spirit of the present invention, the technical problems solved by the embodiments are still consistent with the present invention, and all should be included in the protection scope of the present invention.
Claims (5)
1. A sensor circuit based on a data processing chip is characterized by comprising a pressure-sensitive element for collecting pressure signals, a sample-and-hold circuit connected with the pressure-sensitive element and used for carrying out sample-and-hold on the collected pressure signals, a low-pass filter connected with the sample-and-hold circuit, a sensitivity control circuit connected with the low-pass filter, a clock pulse circuit and a sampling judgment circuit, wherein the clock pulse circuit and the sampling judgment circuit are connected with the sensitivity control circuit; the sensitivity control circuit comprises a time base chip U1 with the model of NE555, an electrolytic capacitor C1 with the anode connected with the 1 st pin of the time base chip U1 and the cathode grounded, a resistor R1 connected with the 1 st pin of the time base chip U1, a capacitor C2 with one end connected with the other end of the resistor R1 and the 2 nd pin of the time base chip U1 and the other end grounded, a capacitor C3 with one end connected with the 5 th pin of the time base chip U1 and the other end grounded, resistors R2 and R3 connected with the 3 rd pin of the time base chip U1, a capacitor C4 connected between the other end of the resistor R2 and the other end of the resistor R3, a resistor R4 and a capacitor C5 with one end connected with the 4 th pin of the time base chip U1 and the other end grounded after being connected in parallel, the time base chip comprises a resistor R5 connected between a 4 th pin and a 7 th pin of a time base chip U1, a resistor R6 connected between a 6 th pin and an 8 th pin of the time base chip U1, an inductor L1 connected with the 6 th pin of the time base chip U1, a diode D1 of which the negative electrode is connected with a2 nd pin of the time base chip U1 and the positive electrode is connected with the other end of the inductor L1 through the resistor R7, a diode D2 of which the positive electrode is connected with the other end of the inductor L1 and the negative electrode is connected with the common end of the resistor R3 and the capacitor C4, a diode D3 of which the negative electrode is connected with the 8 th pin of the time base chip U1 and the positive electrode is connected with a sampling judgment circuit, an electrolytic capacitor C6 of which the positive electrode is connected with the positive electrode of the diode D2 and the negative electrode is grounded, and a resistor R8 connected with two ends of the electrolytic capacitor C6 in parallel; the anode of the diode D4 is connected with the output end of the low-pass filter, and the cathode of the diode D4 is connected with the No. 1 pin of the time-base chip U1; the common end of the resistor R2 and the capacitor C4 is connected with the grounding end of the capacitor C2, and the 1 st pin and the 8 th pin of the time-base chip U1 are connected with the clock pulse circuit.
2. The sensor circuit based on the data processing chip as claimed in claim 1, wherein the sample-and-hold circuit comprises a chip U2 of type AD590, a resistor R8 connected to the V-pin of the chip U2, a resistor R9 and a resistor R10 both connected to the other end of the resistor R8, an electrolytic capacitor C7 having an anode connected to the resistor R10 and a cathode grounded, an amplifier A1 having a non-inverting input connected to the anode of the electrolytic capacitor C7, a varistor R11 having one fixed end connected to the non-inverting input of the amplifier A1 and the other fixed end grounded, an amplifier A2 having a non-inverting input connected to the free end of the varistor R11, a resistor R12 having one end connected to both the inverting input and the output of the amplifier A1 and the other end connected to the inverting input of the amplifier A2, and a resistor R13 having one end connected to the inverting input of the amplifier A2 and the other end connected to the output of the amplifier A2; the voltage source control circuit comprises a chip U2, a resistor R9, a low-pass filter, a pressure sensor and a CAN pin, wherein the V + pin of the chip U2 is connected with the anode of a 12V voltage source, the other end of the resistor R9 is connected with the cathode of the 12V voltage source, the other end of the resistor R10 is grounded, the positive and negative power supply ends of the amplifier A2 are correspondingly connected with the anode and the cathode of the 12V voltage source, the output end of the amplifier A2 is connected with the low-pass filter, and the CAN pin of the chip U2 is connected with the output end of the pressure sensor.
3. The sensor circuit based on the data processing chip of claim 2, wherein the clock pulse circuit comprises a crystal oscillator RX1 connected between the 1 st and 8 th pins of the time base chip U1, a capacitor C8 with one end connected to one of the crystal oscillator pins of the signal transceiver chip and the other end grounded, and a capacitor C9 with one end connected to the other crystal oscillator pin of the signal transceiver chip and the other end grounded.
4. The sensor circuit based on the data processing chip as claimed in claim 3, wherein the sampling decision circuit comprises a resistor R14 connected to the cathode of the diode D3 in the sensitivity control circuit, a diode D5 having an anode connected to the other end of the resistor R14 and a cathode connected to the cathode of the diode D3 in the sensitivity control circuit, a capacitor C10 connected to the anode of the diode D5 and the other end grounded, resistors R15 and R16 having one end connected to the anode of the diode D5 after series connection and the other end grounded, a transistor Q1 having a base connected to the common terminal of the resistors R15 and R16 and a grounded emitter, and a resistor R17 having one end connected to the collector of the transistor Q1 and the other end connected to the VCC terminal.
5. The data processing chip based sensor circuit of claim 4, wherein the low pass filter is LFCN-3800+.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222328603.7U CN218330352U (en) | 2022-08-31 | 2022-08-31 | Sensor circuit based on data processing chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222328603.7U CN218330352U (en) | 2022-08-31 | 2022-08-31 | Sensor circuit based on data processing chip |
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| Publication Number | Publication Date |
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| CN218330352U true CN218330352U (en) | 2023-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222328603.7U Active CN218330352U (en) | 2022-08-31 | 2022-08-31 | Sensor circuit based on data processing chip |
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| CN (1) | CN218330352U (en) |
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- 2022-08-31 CN CN202222328603.7U patent/CN218330352U/en active Active
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Effective date of registration: 20231023 Address after: 610000 No. 1, floor 1, building 1, No. 6, louver Road, high tech Zone (West District), Chengdu, Sichuan Patentee after: Sichuan Tianqi Technology Co.,Ltd. Address before: 610000 No. 1, floor 1, building 1, No. 6, louver Road, high tech Zone, Chengdu, Sichuan Patentee before: Sichuan Zongheng Lutong Technology Co.,Ltd. |
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