CN111443233A - Zero setting circuit of sensor - Google Patents
Zero setting circuit of sensor Download PDFInfo
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- CN111443233A CN111443233A CN202010339669.9A CN202010339669A CN111443233A CN 111443233 A CN111443233 A CN 111443233A CN 202010339669 A CN202010339669 A CN 202010339669A CN 111443233 A CN111443233 A CN 111443233A
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- sensor
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- microprocessor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
Abstract
A zeroing circuit of a sensor, 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, an analog switch array, a resistor array and an addition circuit which are sequentially connected, the second microprocessor is in communication connection with the first microprocessor, and the addition circuit is connected with a zero setting position joint 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 invention can realize closed-loop automatic zero setting, greatly improves the efficiency of zero setting operation and is beneficial to reducing the labor cost.
Description
Technical Field
The invention belongs to the technical field of sensors, and particularly relates to a zero setting circuit for a measuring sensor.
Background
Sensors have wide application in the field of measurement. Due to the circuit design of the sensor, environmental influences and the like, a zero setting circuit needs to be added in a circuit in the design process of a measuring sensor, such as a current sensor. At present, most of measuring sensors adopt the principle of potentiometer voltage division to carry out zero setting. The use of the potentiometer requires manual intervention at each stage of the sensor production process, for example, in the production process, zero setting needs to be manually performed by workers, which not only has low production efficiency and high labor cost, but also introduces higher manual error. 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.
Disclosure of Invention
The invention aims to provide a sensor zero setting circuit capable of improving zero setting efficiency.
In order to achieve the purpose, the invention adopts the following technical solutions:
a zeroing circuit of a sensor, 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, an analog switch array, a resistor array and an addition circuit which are sequentially connected, the second microprocessor is in communication connection with the first microprocessor, and the addition circuit is connected with a zero setting position joint 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, the analog switch array comprises a plurality of single-pole single-throw analog switches connected in series, the resistor array comprises a plurality of resistors connected in series, the number of the single-pole single-throw analog switches in the analog switch array corresponds to the number of the resistors in the resistor array, and one single-pole single-throw analog switch is connected with one resistor in parallel.
More specifically, the resistors in the resistor array have different resistance values.
More specifically, the resistances of the resistors in the resistor array are sequentially increased.
More specifically, the resistance value of each resistor in the resistor array is an integral multiple of the resistance value of the previous resistor.
More specifically, when a single-pole single-throw analog switch in the analog switch array is turned off, a current flows through a resistor connected to the single-pole single-throw analog switch, and when the single-pole single-throw analog switch is turned on, a resistor connected to the single-pole single-throw analog switch is short-circuited, and a current flows through the single-pole single-throw analog switch.
More specifically, the device further comprises a divider resistor connected with the output end of the resistor array, and the other end of the divider resistor is grounded.
More specifically, the device further comprises a serial-to-parallel circuit, and the second microprocessor is connected with the analog switch array through the serial-to-parallel circuit.
More specifically, the addition circuit comprises an operational amplifier, the output end of the resistor array is connected with the inverting input end of the operational amplification circuit, the inverting input end of the operational amplification circuit is simultaneously connected with the output end of the operational amplification circuit, the inverting input end of the operational amplification circuit is connected with the negative voltage power supply end and is simultaneously grounded, the non-inverting input end of the operational amplification circuit is grounded, and the output end of the operational amplification circuit is connected with the zero setting position connecting part of the sensor.
More specifically, the inverting input end of the operational amplifier circuit is connected with the output end of the resistor array through a resistor (R10), the inverting input end of the operational amplifier circuit is connected with the output end of the operational amplifier circuit through a resistor (R11), the inverting input end of the operational amplifier circuit is also connected with a resistor (R12), and the other end of the resistor (R12) is connected with a negative voltage power supply end through a resistor (R13) and is grounded through a resistor (R14).
According to the technical scheme, the zero setting circuit is combined with the digital technology, the first microprocessor in the zero acquisition module can receive the zero data of the sensor acquired by the universal meter, the zero data of the sensor can be acquired by the AD acquisition module, the zero setting circuit can be flexibly applied to two application scenes of factory production and field debugging, meanwhile, the second microprocessor in the zero setting output module controls the analog switch to simulate the zero setting mode of potentiometer voltage division, the resistance value of the resistor array is controlled by controlling the on/off of the analog switch, the purpose of controllable voltage value output is achieved, the closed-loop automatic zero setting of the sensor is realized, the efficiency of zero setting operation is greatly improved, and the labor cost is favorably reduced.
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 block circuit diagram of an embodiment of the present invention;
fig. 2 is a circuit diagram of a zeroing output module according to an 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 invention will be described in detail below with reference to the accompanying drawings, wherein for the purpose of illustrating embodiments of the invention, the drawings showing the structure of the device are not to scale but are partly enlarged, and the schematic drawings are only examples, and should not be construed as limiting the scope of the invention. It is to be noted, however, that the drawings are designed in a simplified form and are not to scale, but rather are to be construed in an attempt to more clearly and concisely illustrate embodiments of the present invention.
As shown in fig. 1, the sensor zero setting circuit of this embodiment includes a zero point acquisition module, a zero point output module, and a power module for supplying power to the zero point acquisition module and the zero point output module, and the power module may adopt a power supply of the sensor itself. The utility model discloses a sensor, including the universal meter, the universal meter is used for gathering the voltage at zero point of sensor, wherein, the collection module at zero point is used for gathering the voltage at zero point of sensor, and it includes first microprocessor, and first microprocessor has the data interface that links to each other with the universal meter, and the universal meter is used for gathering the voltage at zero point after the sensor is gone up, acquires the size at current sensor zero point through the voltage data that the universal meter gathered, and the data transmission that the universal meter was gathered gives first microprocessor, and first microprocessor processes the data of gathering and exports zero adjustment. 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 of the embodiment comprises a second microprocessor, a serial-to-parallel circuit, an analog switch array, a resistor array and an addition circuit. The second microprocessor processes and outputs the data information output by the zero point acquisition module, and an EEPROM in the second microprocessor can store zero setting information (information for controlling the on-off of the analog switch). The serial-to-parallel circuit is used for converting serial data output by the second microprocessor into parallel data and outputting the parallel data to the analog switch array. The analog switch array is composed of a plurality of single-pole single-throw analog switches connected in series. The resistor array comprises a plurality of resistors which are connected in series and have different resistance values, the resistance values of the resistors in the resistor array are sequentially increased, the resistance value of each resistor is an integral multiple of the resistance value of the previous resistor, for example, when the resistance value of each resistor is 2 times, the total resistance value of the resistor array can be controlled to be 0 to (2) according to the on-off state of an analog switch in the analog switch arrayn-1)*R0In the range of (1), R0Is the resistance value of the first resistor in the resistor array, and n is the number of resistors in the resistor array. Single-pole single-throw analog switch in analog switch array and pair in resistor arrayThe resistors are connected in parallel, the number of the analog switches in the analog switch array corresponds to the number of the resistors in the resistor array, and the number can be increased or decreased according to actual needs. The divider resistor is connected with the output end of the resistor array in series, and the other end of the divider resistor is grounded. When the second microprocessor adopts a chip with rich pin functions, the serial-to-parallel circuit can be omitted, but the cost is lower by adopting a chip with simpler pin functions to match the serial-to-parallel circuit. 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 first microprocessor and the second microprocessor of this embodiment may adopt a single chip microcomputer of macrocrystalline company with model STC15F101W, and the serial-to-parallel circuit adopts a serial-to-parallel chip with model 74HC 595.
Fig. 2 is a circuit diagram of the zero-setting output module in this embodiment, and as shown in fig. 2, the second microprocessor S1 of this embodiment is connected to a serial-to-parallel circuit, and the serial-to-parallel circuit employs a serial-to-parallel chip D1. The second microprocessor S1 outputs digital codes to the analog switch array through the serial-to-parallel chip D1, the analog switches (U1 to U8) in the analog switch array are selectively turned on or off according to the received level signal, when one of the analog switches is turned off, a current flows through the resistor connected to the analog switch, and when the analog switch is turned on, the resistor connected to the analog switch is short-circuited, the current flows through the analog switch, the total resistance value of the resistor array is reduced, and the total resistance value of the resistor array is adjusted by the action of the analog switch. The resistance values of the resistors (R1-R8) in the resistor array can be adjusted according to specific requirements. The divider resistor R9 is connected with the output end of the resistor array, the other end of the divider resistor R9 is grounded, the divider resistor R9 is used for dividing voltage, and the divided voltage value is positive voltage. The input end of the addition circuit is connected with the output end of the resistor array, the addition circuit provides negative voltage for the final Output (OUT) of the zero setting output module, the addition circuit of the embodiment comprises an operational amplifier 1C1A, the output end of the resistor array is connected with the inverting input end of an operational amplifier circuit 1C1A through a resistor R10, the inverting input end of the operational amplifier circuit 1C1A is simultaneously connected with the output end of the operational amplifier circuit 1C1A through a resistor R11, the inverting input end of the operational amplifier circuit 1C1A is also connected with a resistor R12, the other end of the resistor R12 is connected with a negative voltage power supply end through a resistor R13 and is grounded through a resistor R14; the non-inverting input terminal of the operational amplifier circuit 1C1A is grounded; the output end of the operational amplifier circuit 1C1A is connected to the zero position junction of the sensor.
The automatic zero setting circuit can be used for zero point debugging in the production process of the sensor and can also be used for zero point debugging in daily maintenance of the sensor. 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 point voltage of a sensor, a zero point acquisition module can know the size of the current zero point of the sensor through the voltage acquired by the universal meter, 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 the field application scene of maintenance, the sensor has been installed at the measured end this moment, in order to facilitate the operation, can not gather the zero voltage of sensor with the universal meter, but gather the zero voltage of sensor through AD acquisition circuit by first microprocessor, and to zero the data that the output module of zero adjustment exported the collection, after zero adjustment output module received the data of gathering, output voltage changes the sensor zero point, the sensor zero voltage after changing is gathered by zero acquisition module again, form next cycle, the zero data transmission that newly gathers is to zero adjustment output module, zero adjustment output module changes the code of controlling analog switch and changes the sensor zero point, when zero acquisition module gathers the zero point and accords with the big or small scope of preset zero point, then stop zero adjustment operation, zero adjustment finishes. 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 (10)
1. A zeroing circuit for a sensor, 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, an analog switch array, a resistor array and an addition circuit which are sequentially connected, the second microprocessor is in communication connection with the first microprocessor, and the addition circuit is connected with a zero setting position joint 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 zeroing circuit of a sensor of claim 1, wherein: the analog switch array comprises a plurality of single-pole single-throw analog switches connected in series, the resistor array comprises a plurality of resistors connected in series, the number of the single-pole single-throw analog switches in the analog switch array corresponds to the number of the resistors in the resistor array, and one single-pole single-throw analog switch is connected with one resistor in parallel.
3. The zeroing circuit of a sensor of claim 1, wherein: the resistors in the resistor array have different resistance values.
4. The zeroing circuit of a sensor according to claim 1, 2 or 3, characterized in that: and the resistance values of the resistors in the resistor array are sequentially increased.
5. The zeroing circuit of a sensor according to claim 4, wherein: the resistance value of each resistor in the resistor array is integral multiple of the resistance value of the previous resistor.
6. The zeroing circuit of a sensor according to claim 2, characterized in that: when a single-pole single-throw analog switch in the analog switch array is turned off, a current flows through a resistor correspondingly connected with the single-pole single-throw analog switch, and when the single-pole single-throw analog switch is turned on, the resistor correspondingly connected with the single-pole single-throw analog switch is short-circuited, and the current flows through the single-pole single-throw analog switch.
7. The zeroing circuit of a sensor of claim 1, wherein: the resistor array further comprises a divider resistor connected with the output end of the resistor array, and the other end of the divider resistor is grounded.
8. The zeroing circuit of a sensor of claim 1, wherein: the second microprocessor is connected with the analog switch array through the serial-to-parallel circuit.
9. The zeroing circuit of a sensor of claim 1, wherein: the summing circuit comprises an operational amplifier, the output end of the resistor array is connected with the inverting input end of the operational amplifying circuit, the inverting input end of the operational amplifying circuit is simultaneously connected with the output end of the operational amplifying circuit, the inverting input end of the operational amplifying circuit is connected with the negative voltage power supply end and is simultaneously grounded, the non-inverting input end of the operational amplifying circuit is grounded, and the output end of the operational amplifying circuit is connected with the zero setting position connecting part of the sensor.
10. The zeroing circuit of a sensor of claim 9, wherein: the inverting input end of the operational amplification circuit is connected with the output end of the resistor array through a resistor (R10), the inverting input end of the operational amplification circuit is connected with the output end of the operational amplification circuit through a resistor (R11), the inverting input end of the operational amplification circuit is also connected with a resistor (R12), and the other end of the resistor (R12) is connected with a negative voltage power supply end through a resistor (R13) and is grounded through a resistor (R14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010339669.9A CN111443233A (en) | 2020-04-26 | 2020-04-26 | Zero setting circuit of sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010339669.9A CN111443233A (en) | 2020-04-26 | 2020-04-26 | Zero setting circuit of sensor |
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| Publication Number | Publication Date |
|---|---|
| CN111443233A true CN111443233A (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010339669.9A Pending CN111443233A (en) | 2020-04-26 | 2020-04-26 | Zero setting circuit of sensor |
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|---|---|
| CN (1) | CN111443233A (en) |
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2020
- 2020-04-26 CN CN202010339669.9A patent/CN111443233A/en active Pending
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