CN212540441U - Automatic zero setting circuit of sensor - Google Patents
Automatic zero setting circuit of sensor Download PDFInfo
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- CN212540441U CN212540441U CN202020657641.5U CN202020657641U CN212540441U CN 212540441 U CN212540441 U CN 212540441U CN 202020657641 U CN202020657641 U CN 202020657641U CN 212540441 U CN212540441 U CN 212540441U
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Abstract
A sensor auto-zero circuit comprising: the system comprises a zero point acquisition module, a first microprocessor and a second microprocessor, wherein the zero point acquisition module is used for acquiring zero point voltage of a sensor and comprises the first microprocessor, the first microprocessor is provided with a data interface connected with a universal meter, acquires zero point voltage data of the sensor through the universal meter and sends the data to the first microprocessor, and the first microprocessor is connected with the sensor through an AD acquisition circuit; the zero setting output module is connected with the zero point acquisition module and comprises a second microprocessor, a filter circuit and a differential amplification circuit which are sequentially connected, the second microprocessor is in communication connection with the first microprocessor, and the differential amplification circuit is connected with the zero setting position connection part of the sensor and outputs voltage to the sensor; and the power supply module supplies power to the zero point acquisition module and the zero adjustment output module. The utility model discloses can realize the automatic zero setting of closed loop, greatly improve the efficiency of zero setting operation, be favorable to reducing the cost of labor.
Description
Technical Field
The utility model belongs to the technical field of the electronic circuit, especially, relate to an automatic zero setting circuit for sensor.
Background
In order to improve the accuracy of measurement, sensors for power measurement, such as current sensors, need to be zeroed to eliminate the zero point due to environmental influences and design problems of the circuit itself. At present, the sensor is basically adjusted to zero by adopting the principle of potentiometer voltage division. In the production process, the zero setting is generally manually performed by workers, so that the production efficiency is low, the labor cost is high, and higher manual errors can be introduced. Some sensors also need to be zeroed in the installation process, and the manual zeroing mode also affects the installation efficiency. In addition, due to aging of circuit devices and environmental influences, workers are also required to re-zero in the field during the later maintenance of the sensor, which undoubtedly also increases the maintenance cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a can improve the automatic zero setting circuit of sensor of zero setting efficiency.
In order to achieve the above object, the present invention adopts the following technical solutions:
a sensor auto-zero circuit comprising: the system comprises a zero point acquisition module, a first microprocessor and a second microprocessor, wherein the zero point acquisition module is used for acquiring zero point voltage of a sensor and comprises the first microprocessor, the first microprocessor is provided with a data interface connected with a universal meter, acquires zero point voltage data of the sensor through the universal meter and sends the data to the first microprocessor, and the first microprocessor is connected with the sensor through an AD acquisition circuit; the zero setting output module is connected with the zero point acquisition module and comprises a second microprocessor, a filter circuit and a differential amplification circuit which are sequentially connected, the second microprocessor is in communication connection with the first microprocessor, and the differential amplification circuit is connected with the zero setting position connection part of the sensor and outputs voltage to the sensor; and the power supply module supplies power to the zero point acquisition module and the zero adjustment output module.
More specifically, pin 1 of the second microprocessor is a clock pin, pin 2 is a power supply pin, pin 3 is connected with the filter circuit, pin 4 is grounded, pins 5 and 6 are empty pins, pin 7 is connected with pin 8, pin 8 is a data pin, and the data pin is connected with the first microprocessor.
More specifically, the filter circuit is a multi-stage RC low-pass filter circuit.
More specifically, the differential amplifier circuit comprises a first operational amplifier and a second operational amplifier, wherein the non-inverting input end of the first operational amplifier is connected with the output end of the filter circuit, the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is connected with the non-inverting input end of the second operational amplifier; the non-inverting input end of the second operational amplifier is grounded, the inverting input end of the second operational amplifier is connected with the power supply end and is grounded at the same time, the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier at the same time, and the output end of the second operational amplifier is connected with the zero setting position connecting part of the sensor.
More specifically, the output terminal of the first operational amplifier is connected to the non-inverting input terminal of the second operational amplifier via a resistor (R4).
More specifically, the non-inverting input terminal of the second operational amplifier is grounded via a resistor (R5).
More specifically, the inverting input terminal of the second operational amplifier is connected to the power supply terminal via resistors (R6, R8) and is grounded via resistors (R6, R9).
More specifically, the inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier via a resistor (R7).
According to the above technical scheme, the utility model discloses a sensor zero data of gathering with the universal meter both can be received to first microprocessor among the collection module of zero point, also can gather the zero data of sensor through AD collection module, can be applied to two kinds of application scenes of factory production and field debugging in a flexible way, simultaneously through the second microprocessor among the zero setting output module, the PWM waveform of exporting different duty ratios, be direct current voltage value through demodulation PWM waveform, reach the purpose of controllable voltage value output, can realize closed loop autozero, the efficiency of zero setting operation has greatly been improved, be favorable to reducing the cost of labor.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a circuit block diagram of an embodiment of the present invention;
fig. 2 is a circuit diagram of the zeroing output module according to the embodiment of the present invention.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings, wherein for convenience of illustration, the drawings showing the structure of the device are not to scale and are partially enlarged, and the drawings are only examples, which should not limit the scope of the invention. It should be noted that the drawings are in simplified form and are not to precise scale, which is only used for the purpose of facilitating and clearly assisting in the description of the embodiments of the present invention.
As shown in fig. 1, the automatic zero adjustment circuit of the sensor of this embodiment includes a zero point acquisition module, a zero adjustment output module, and a power module for supplying power to the zero point acquisition module and the zero adjustment output module. The zero point acquisition module is used for acquiring the zero point voltage of the sensor and comprises a first microprocessor, the first microprocessor is provided with a data interface connected with a universal meter, the universal meter is used for acquiring the zero point voltage after the sensor is powered on, the voltage acquired by the universal meter acquires the size of the zero point of the current sensor, the data acquired by the universal meter is sent to the first microprocessor, and the first microprocessor outputs the acquired data information to the zero setting output module to form an information closed loop. The first microprocessor can also acquire the zero voltage of the sensor through the AD acquisition circuit.
And the zero setting output module is connected with the sensor and used for adjusting the zero point of the sensor according to the data information acquired by the zero point acquisition module. The zero setting output module comprises a second microprocessor, a filter circuit and a differential amplification circuit. The second microprocessor outputs PWM waveforms with different duty ratios according to the data information output by the zero point acquisition module, and an EEPROM in the second microprocessor can store zero setting information (PWM output duty ratio). The filter circuit is used for processing the PWM waveform output by the second microprocessor into direct current voltage, and the PWM waveform output by the second microprocessor outputs stable direct current voltage after being processed by the filter circuit. The differential amplification circuit adds negative voltage to the DC voltage output by the filter circuit, outputs a DC voltage value to the sensor, and performs zero point adjustment. The transmission mode of signals between the first microprocessor in the zero point acquisition module and the second microprocessor in the zero point output module can be selected by self according to requirements, and an IIC transmission mode is used in the embodiment. The utility model discloses a first microprocessor and second microprocessor can adopt the model of macro crystal company to be STC15F101W, STC15F 102W's singlechip, or HTM073 type singlechip, all from taking EEPROM in first microprocessor and the second microprocessor.
Fig. 2 is a circuit diagram of the zero-setting output module in this embodiment, as shown in fig. 2, pin 1 of the second microprocessor S1 in this embodiment is a clock pin, pin 2 is a power supply pin, pin 3 is connected to the filter circuit, pin 4 is grounded, pins 5 and 6 are empty pins, pin 7 is connected to pin 8, pin 8 is a data pin, and pins 1 and 8 are a clock line and a data line for IIC communication, respectively. The second microprocessor adjusts the PWM output duty ratio and outputs PWM waves to the filter circuit. The filter circuit of this embodiment is a multi-stage RC low-pass filter circuit composed of a plurality of resistors and resistors, the number of stages of the RC filter circuit can be increased or decreased according to the requirement, and this embodiment employs a three-stage RC filter circuit. The filter circuit filters the PWM wave and outputs a voltage value of 0 to U0 (U0 is a supply voltage of the second microprocessor) to the differential amplifier circuit. The voltage required for the zero adjustment of the sensor not only needs positive voltage, but also needs negative voltage, and the filtered voltage is reduced through a differential amplification circuit, so that the final output contains the negative voltage required for the zero adjustment of the sensor. The output end of the differential amplification circuit is connected to the zero setting position connection position of the sensor, and the zero point of the sensor is changed through the output voltage.
The differential amplification circuit of the present embodiment includes a first operational amplifier IC1B and a second operational amplifier IC 1A. The output end of the filter circuit is connected with the non-inverting input end of a first operational amplifier IC1B, the inverting input end of the first operational amplifier IC1B is connected with the output end of a first operational amplifier IC1B, the output end of the first operational amplifier IC1B is connected with the non-inverting input end of a second operational amplifier IC1A through a resistor R4, the non-inverting input end of the second operational amplifier IC1A is grounded through a resistor R5, the inverting input end of the second operational amplifier IC1A is connected with the power supply end through a resistor R6 and a resistor R8 and grounded through a resistor R6 and a resistor R9, the inverting input end of the second operational amplifier IC1A is connected with the output end of the second operational amplifier IC1A through a resistor R7, and the output end of the second operational amplifier IC1A is connected with the zero-setting position connection position of the sensor.
The utility model discloses an automatic zero setting circuit can be used to the debugging in the production process, also can be used to the debugging when the routine maintenance. In a factory production application scene, in order to improve zero adjustment precision and zero adjustment efficiency, a universal meter is used for acquiring zero voltage of a sensor, a zero acquisition module can know the size of the current zero point of the sensor through the acquired voltage, a first microprocessor processes acquired data and outputs the processed data to a zero adjustment output module, and the zero adjustment output module outputs voltage to change the zero point of the sensor after receiving the acquired data; and when the zero point acquired by the zero point acquisition module accords with the preset zero point size range, stopping the zero adjustment operation and finishing the zero adjustment.
In a maintenance field application scene, the sensor is installed at a measured end, in order to facilitate operation, a multimeter is not used for collecting the zero voltage of the sensor, the data pin of the first microprocessor is used for collecting the zero voltage of the sensor through the AD collecting circuit and outputting the collected data to the zero adjusting output module, and the zero adjusting output module outputs the voltage to change the zero point of the sensor after receiving the collected data; and when the zero point acquired by the zero point acquisition module conforms to the preset zero point size range, stopping the zero point adjustment operation and finishing the zero point adjustment. In the maintenance and debugging process, the zero voltage of the sensor is acquired through the first microprocessor, so that the field operability is greatly improved, and the operation of operation and maintenance workers is more convenient.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A sensor auto-zero circuit, comprising:
the system comprises a zero point acquisition module, a first microprocessor and a second microprocessor, wherein the zero point acquisition module is used for acquiring zero point voltage of a sensor and comprises the first microprocessor, the first microprocessor is provided with a data interface connected with a universal meter, acquires zero point voltage data of the sensor through the universal meter and sends the data to the first microprocessor, and the first microprocessor is connected with the sensor through an AD acquisition circuit;
the zero setting output module is connected with the zero point acquisition module and comprises a second microprocessor, a filter circuit and a differential amplification circuit which are sequentially connected, the second microprocessor is in communication connection with the first microprocessor, and the differential amplification circuit is connected with the zero setting position connection part of the sensor and outputs voltage to the sensor;
and the power supply module supplies power to the zero point acquisition module and the zero adjustment output module.
2. The sensor auto-zero circuit of claim 1, wherein: and a pin 1 of the second microprocessor is a clock pin, a pin 2 of the second microprocessor is a power supply pin, a pin 3 of the second microprocessor is connected with the filter circuit, a pin 4 of the second microprocessor is grounded, pins 5 and 6 of the second microprocessor are empty pins, a pin 7 of the second microprocessor is connected with a pin 8 of the second microprocessor, a pin 8 of the second microprocessor is a data pin, and the data pin is connected with the first microprocessor.
3. The sensor auto-zero circuit of claim 1, wherein: the filter circuit is a multi-stage RC low-pass filter circuit.
4. The sensor auto-zero circuit of claim 1, wherein: the differential amplification circuit comprises a first operational amplifier and a second operational amplifier, wherein the non-inverting input end of the first operational amplifier is connected with the output end of the filter circuit, the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is connected with the non-inverting input end of the second operational amplifier; the non-inverting input end of the second operational amplifier is grounded, the inverting input end of the second operational amplifier is connected with the power supply end and is grounded at the same time, the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier at the same time, and the output end of the second operational amplifier is connected with the zero setting position connecting part of the sensor.
5. The sensor auto-zero circuit of claim 4, wherein: the output end of the first operational amplifier is connected with the non-inverting input end of the second operational amplifier through a resistor R4.
6. The sensor auto-zero circuit of claim 4, wherein: the non-inverting input of the second operational amplifier is connected to ground through a resistor R5.
7. The sensor auto-zero circuit of claim 4, wherein: the inverting input end of the second operational amplifier is connected with a power supply end through a resistor R6 and a resistor R8, and is grounded through a resistor R6 and a resistor R9.
8. The sensor auto-zero circuit of claim 4, wherein: the inverting input terminal of the second operational amplifier is connected with the output terminal of the second operational amplifier through a resistor R7.
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| CN202020657641.5U CN212540441U (en) | 2020-04-26 | 2020-04-26 | Automatic zero setting circuit of sensor |
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| CN202020657641.5U CN212540441U (en) | 2020-04-26 | 2020-04-26 | Automatic zero setting circuit of sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183334A (en) * | 2021-11-03 | 2022-03-15 | 内蒙古北方重工业集团有限公司 | Method for suppressing zero drift in debugging of amplification plate of radial plunger pump |
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- 2020-04-26 CN CN202020657641.5U patent/CN212540441U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183334A (en) * | 2021-11-03 | 2022-03-15 | 内蒙古北方重工业集团有限公司 | Method for suppressing zero drift in debugging of amplification plate of radial plunger pump |
| CN114183334B (en) * | 2021-11-03 | 2024-03-29 | 内蒙古北方重工业集团有限公司 | Method for debugging and inhibiting zero drift of radial plunger pump amplification plate |
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