CN211317592U - Zero-setting-free micro-sensor signal processing circuit - Google Patents
Zero-setting-free micro-sensor signal processing circuit Download PDFInfo
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- CN211317592U CN211317592U CN202020347116.3U CN202020347116U CN211317592U CN 211317592 U CN211317592 U CN 211317592U CN 202020347116 U CN202020347116 U CN 202020347116U CN 211317592 U CN211317592 U CN 211317592U
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Abstract
The utility model relates to a sensor signal processing field discloses an exempt from to zero microsensor signal processing circuit, including reference voltage unit, first amplification unit, second amplification unit, first amplification unit and second amplification unit are connected to the reference voltage unit electricity respectively, to first amplification unit and the same reference voltage of second amplification unit input, the positive signal output part of sensor is still connected to first amplification unit, and the negative signal output part of sensor is still connected to the second amplification unit, and the amplification factor of first amplification unit and second amplification unit is the same. The utility model discloses in, two amplification unit amplify the positive and negative signal of sensor output on the basis of the same reference voltage of input, and there is the proportional multiple relation in the difference of the signal of two amplification unit outputs and the difference of the positive and negative signal of sensor, directly handle the signal of two amplification unit outputs can, realized exempting from zero setting of sensor.
Description
Technical Field
The utility model relates to a sensor signal processing field, concretely relates to exempt from to zero microsensor signal processing circuit.
Background
Existing sensors, particularly silicon pressure sensors, have zero offset. Because the manufacturers are different, the silicon pressure sensors of different manufacturers can output electric signals with different sizes for the same pressure input, namely, the zero offsets of the silicon pressure sensors of different manufacturers are different. Therefore, during actual use, resistance compensation zero setting needs to be carried out on each sensor, and the signal relation curves of input and output of silicon pressure sensors of different manufacturers to a processor are adjusted to be the same in a resistance compensation mode. However, the compensation resistance of different silicon pressure sensors needs to be determined through test experiments, the compensation difficulty is high, and the zero setting accuracy is poor.
SUMMERY OF THE UTILITY MODEL
In view of the not enough of background art, the utility model provides an exempt from to zero microsensor signal processing circuit, the technical problem prior art that solve eliminates different silicon pressure sensor's zero offset through the resistance compensation mode, and the compensation degree of difficulty is big, and the sensor measurement accuracy after the compensation is poor moreover.
For solving the technical problem, the utility model provides a following technical scheme: the zero-setting-free micro-sensor signal processing circuit comprises a reference voltage unit, a first amplification unit and a second amplification unit, wherein the reference voltage unit is electrically connected with the first amplification unit and the second amplification unit respectively and inputs the same reference voltage to the first amplification unit and the second amplification unit, the first amplification unit is also electrically connected with a positive signal output end of a sensor, the second amplification unit is also electrically connected with a negative signal output end of the sensor, and the amplification factors of the first amplification unit and the second amplification unit are the same.
Further, the reference voltage unit comprises a power supply, voltage dividing resistors R1 and R2 and a capacitor C1, the power supply is connected with one end of a resistor R1, the other end of the resistor R1 is respectively connected with one end of a resistor R2 and one end of a capacitor C1, the other end of the resistor R2 and the other end of the capacitor C1 are both grounded, and one end of the resistor R1, which is connected with the resistor R2, is respectively connected with the first amplifying unit and the second amplifying unit.
Further, the first amplifying unit comprises a first operational amplifier OP1, resistors R3, R4 and a capacitor C2, wherein a negative input end of the first operational amplifier OP1 is respectively connected with one end of a resistor R3 and one end of a resistor R4, the other end of the resistor R3 is connected with a positive signal output end of the sensor, the other end of the resistor R4 is connected with an output end of a first operational amplifier OP1, and the capacitor C2 is connected in parallel with two ends of the resistor R4; the second amplifying unit comprises a second operational amplifier OP2, resistors R5, R6 and a capacitor C3, wherein the negative input end of the second operational amplifier OP2 is respectively connected with one end of a resistor R5 and one end of a resistor R6, the other end of the resistor R5 is connected with the negative signal output end of the sensor, the other end of the resistor R6 is connected with the output end of a second operational amplifier OP2, the capacitor C3 is connected in parallel with the two ends of the resistor R6, and the positive input end of the first operational amplifier OP1 and the positive input end of the second operational amplifier are both connected with the reference voltage unit.
As an improvement, the output end of the first operational amplifier OP1 is connected to the first low pass filter unit, the output end of the second operational amplifier OP2 is connected to the second low pass filter unit, the first low pass filter unit includes a resistor R7 and a capacitor C4, one end of the resistor R7 is connected to the output end of the first operational amplifier OP1, the other end of the resistor R7 is grounded through the capacitor C4, the second low pass filter unit includes a resistor R8 and a capacitor C5, one end of the resistor R8 is connected to the output end of the second operational amplifier, and the other end of the resistor R8 is grounded through the capacitor C6.
The resistance of the resistor R3 is the same as that of the resistor R5, the resistance of the resistor R4 is the same as that of the resistor R6, and the capacitance of the capacitor C2 is the same as that of the capacitor C3.
Compared with the prior art, the utility model beneficial effect who has is: the first amplification unit and the second amplification unit amplify positive and negative signals output by the sensor on the basis of inputting the same reference voltage, the difference between the electric signals output by the two amplification units and the difference between the positive and negative signals output by the sensor have a proportional multiple relation, and the electric signals output by the two amplification units are input to the processor for processing, so that zero setting is not required.
Drawings
The utility model discloses there is following figure:
FIG. 1 is an electrical schematic diagram of the present invention;
fig. 2 is a circuit diagram of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
As shown in fig. 1, a zero-adjustment-free micro-sensor signal processing circuit includes a reference voltage unit 1, a first amplifying unit 2, and a second amplifying unit 3; the reference voltage unit 1 is respectively and electrically connected with the first amplification unit 2 and the second amplification unit 3, the same reference voltage is input into the first amplification unit 2 and the second amplification unit 3, the first amplification unit 2 is also connected with a positive signal output end S + of the sensor, the second amplification unit 3 is also connected with a negative signal output end S-of the sensor, and the amplification factors of the first amplification unit 2 and the second amplification unit 3 are the same; the first amplifying unit 2 is connected with a first low-pass filtering unit 4, and the second amplifying unit is connected with a second low-pass filtering unit 5.
As shown in fig. 2, the reference voltage unit 1 includes a 5V power supply, voltage dividing resistors R1 and R2, and a capacitor C1, wherein the power supply is connected to one end of a resistor R1, the other end of the resistor R1 is connected to one end of a resistor R2 and one end of a capacitor C1, the other ends of the resistor R2 and the capacitor C1 are both grounded, and the ends of the resistors R1 and R2, which are connected, are connected to the first amplifying unit 2 and the second amplifying unit 3, respectively. The capacitor C1 is used for filtering noise and high frequency noise of the reference voltage.
The first amplifying unit 2 amplifies the positive signal output by the sensor, and comprises a first operational amplifier OP1, resistors R3, R4 and a capacitor C2, wherein the negative input end of the first operational amplifier OP1 is respectively connected with one end of a resistor R3 and one end of a resistor R4, the other end of the resistor R3 is connected with the positive signal output end S + of the sensor, the other end of the resistor R4 is connected with the output end of a first operational amplifier OP1, and the capacitor C2 is connected in parallel with two ends of the resistor R4, wherein the amplification factor is- (R4+ R3)/R3; the second amplifying unit 3 amplifies the negative signal output by the sensor, and includes a second operational amplifier OP2, resistors R5, R6 and a capacitor C3, wherein the negative input terminal of the second operational amplifier OP2 is connected to one end of a resistor R5 and one end of a resistor R6, the other end of the resistor R5 is connected to the negative signal output terminal S "of the sensor, the other end of the resistor R6 is connected to the output terminal of a second operational amplifier OP2, the capacitor C3 is connected in parallel to two ends of the resistor R6, wherein the amplification factor is- (R5+ R6)/R6, and the positive input terminal of the first operational amplifier OP1 and the positive input terminal of the second operational amplifier are both connected to the resistor R3.
In this embodiment, the resistance of the resistor R3 is the same as that of the resistor R5, the resistance of the resistor R4 is the same as that of the resistor R6, the capacitance of the capacitor C2 is the same as that of the capacitor C3, and the amplification factors of the two operational amplifiers are the same, and since the positive input terminals of the first operational amplifier OP1 and the second operational amplifier OP2 are connected by the same reference, the difference between OUT + and OUT-is (R4+ R3)/R3 times the difference between S + and S-, thereby achieving zero adjustment avoidance.
The first low-pass filter unit 4 comprises a resistor R7 and a capacitor C4, one end of the resistor R7 is connected to the output end of the first operational amplifier OP1, the other end of the resistor R7 is grounded through a capacitor C4, the second low-pass filter unit 5 comprises a resistor R8 and a capacitor C5, one end of the resistor R8 is connected to the output end of the second operational amplifier, and the other end of the resistor R8 is grounded through a capacitor C6.
In light of the above, the present invention is not limited to the above embodiments, and various changes and modifications can be made by the worker without departing from the scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (5)
1. The utility model provides a zero setting-free microsensor signal processing circuit which characterized in that: including reference voltage unit, first amplification unit, second amplification unit, first amplification unit is connected to the reference voltage unit electricity respectively and is connected first amplification unit and second amplification unit, to the same reference voltage of first amplification unit and second amplification unit input, first amplification unit still electricity is connected the positive signal output end of sensor, the negative signal output end of sensor is still connected to the second amplification unit electricity, the magnification of first amplification unit and second amplification unit is the same.
2. The zeroing-free micro-sensor signal processing circuit of claim 1, wherein: the reference voltage unit comprises a power supply, a resistor R1, a resistor R2 and a capacitor C1, the power supply is connected with one end of a resistor R1, the other end of the resistor R1 is respectively connected with one end of a resistor R2 and one end of a capacitor C1, the other end of the resistor R2 and the other end of the capacitor C1 are both grounded, and one end of the resistor R1, which is electrically connected with the resistor R2, is respectively connected with the first amplifying unit and the second amplifying unit.
3. The zeroing-free micro-sensor signal processing circuit of claim 1, wherein: the first amplifying unit comprises a first operational amplifier OP1, resistors R3, R4 and a capacitor C2, wherein the negative input end of the first operational amplifier OP1 is respectively connected with one end of a resistor R3 and one end of a resistor R4, the other end of the resistor R3 is connected with the positive signal output end of the sensor, the other end of the resistor R4 is connected with the output end of a first operational amplifier OP1, and the capacitor C2 is connected in parallel with the two ends of the resistor R4; the second amplifying unit comprises a second operational amplifier OP2, resistors R5, R6 and a capacitor C3, wherein the negative input end of the second operational amplifier OP2 is respectively connected with one end of a resistor R5 and one end of a resistor R6, the other end of the resistor R5 is connected with the negative signal output end of the sensor, the other end of the resistor R6 is connected with the output end of a second operational amplifier OP2, the capacitor C3 is connected in parallel with the two ends of the resistor R6, and the positive input end of the first operational amplifier OP1 and the positive input end of the second operational amplifier are both connected with the reference voltage unit.
4. The zeroing-free micro-sensor signal processing circuit of claim 3, wherein: the output end of the first operational amplifier OP1 is connected with a first low-pass filtering unit, and the output end of the second operational amplifier OP2 is connected with a second low-pass filtering unit.
5. The zeroing-free micro-sensor signal processing circuit of claim 4, wherein: the first low-pass filtering unit comprises a resistor R7 and a capacitor C4, one end of the resistor R7 is connected with the output end of the first operational amplifier OP1, the other end of the resistor R7 is grounded through a capacitor C4, the second low-pass filtering unit comprises a resistor R8 and a capacitor C5, one end of the resistor R8 is connected with the output end of the second operational amplifier, and the other end of the resistor R8 is grounded through a capacitor C6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020347116.3U CN211317592U (en) | 2020-03-18 | 2020-03-18 | Zero-setting-free micro-sensor signal processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020347116.3U CN211317592U (en) | 2020-03-18 | 2020-03-18 | Zero-setting-free micro-sensor signal processing circuit |
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| Publication Number | Publication Date |
|---|---|
| CN211317592U true CN211317592U (en) | 2020-08-21 |
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| CN202020347116.3U Active CN211317592U (en) | 2020-03-18 | 2020-03-18 | Zero-setting-free micro-sensor signal processing circuit |
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- 2020-03-18 CN CN202020347116.3U patent/CN211317592U/en active Active
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