CN211928460U - Voltage source reference circuit - Google Patents
Voltage source reference circuit Download PDFInfo
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- CN211928460U CN211928460U CN201922075164.1U CN201922075164U CN211928460U CN 211928460 U CN211928460 U CN 211928460U CN 201922075164 U CN201922075164 U CN 201922075164U CN 211928460 U CN211928460 U CN 211928460U
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Abstract
The utility model discloses a voltage source reference circuit, including host system, reference voltage source module, analog-to-digital conversion module, temperature compensation module, reference voltage source module with the analog-to-digital conversion module links to each other, the analog-to-digital conversion module with the temperature compensation module respectively with the host system electricity is connected. The utility model discloses a modularization is handled, has solved among the prior art voltage source reference circuit high temperature and has floated, influences the defect of circuit performance, has realized that the low temperature floats or the beneficial effect that zero temperature floats.
Description
Technical Field
The utility model belongs to the technical field of the electronic technology and specifically relates to a voltage source reference circuit is related to.
Background
With the development of metering technology, the requirements on metering precision and sensitivity are higher and higher, but the temperature drift is a main factor influencing the performance of the electromagnetic balance sensor. In general, the main reason for generating the temperature drift is the heat generation of the overcurrent element in the analog-to-digital conversion circuit or the voltage source reference circuit, which are important components of the electromagnetic balance sensor, and the operating environment temperature.
At present, most domestic electromagnetic balance sensors are not subjected to temperature compensation, and a power supply and a reference voltage source of an analog-to-digital converter are obtained by adopting high-precision and low-noise linear voltage stabilization chips. But the temperature drift problem of the voltage stabilization chip cannot be avoided.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a voltage source reference circuit can effectively reduce the temperature and float, makes the circuit realize that the low temperature floats or zero temperature floats.
In a first aspect, an embodiment of the present invention provides a voltage source reference circuit, including:
the device comprises a main control module, a reference voltage source module, an analog-to-digital conversion module and a temperature compensation module, wherein the reference voltage source module is connected with the analog-to-digital conversion module, and the analog-to-digital conversion module and the temperature compensation module are respectively and electrically connected with the main control module.
The utility model discloses a voltage source reference circuit. The method has the following beneficial effects: through modular processing, the defect that the performance of a voltage source reference circuit is affected due to high temperature drift in the prior art is overcome, and the beneficial effect of low temperature drift or zero temperature drift is achieved.
According to the utility model discloses a voltage source reference circuit of other embodiments, main control module includes control unit, memory cell, start mode setting unit, memory cell and start mode setting unit are connected with the control unit electricity respectively.
Further, the storage unit adopts an FM25L256 chip.
According to the utility model discloses a voltage source reference circuit of other embodiments, reference voltage source module includes reference voltage stabilization unit, accurate resistor network unit, operational amplifier unit and filtering unit, the filtering unit includes first filtering unit and second filtering unit, reference voltage stabilization unit first filtering unit accurate resistor network unit operational amplifier unit with second filtering unit electricity is connected in proper order.
Furthermore, the reference voltage stabilizing unit comprises a reference voltage stabilizing chip, a second pin and a third pin of the reference voltage stabilizing chip are respectively grounded, a fourth pin is connected with a power supply, one end of the first pin is connected with the power supply through a first resistor, the other end of the first pin is connected with the first filtering unit, and meanwhile, the first pin is also directly connected with the accurate resistor network unit.
Furthermore, the accurate resistor network unit comprises an accurate resistor network chip, a first pin and a ninth pin of the accurate resistor network chip are grounded, a fourth pin is connected with the reference voltage stabilizing unit, a seventh pin and an eighth pin are grounded through the second filtering unit after being connected, and the seventh pin and the eighth pin are also connected with a positive input end of the operational amplifier unit after being connected.
According to the utility model discloses a voltage source reference circuit of other embodiments, the analog-to-digital conversion module includes analog-to-digital conversion unit and third filter unit, analog-to-digital conversion unit electricity is connected third filter unit.
Further, the analog-to-digital conversion unit adopts an LTC2415 chip.
According to another embodiment of the present invention, the voltage source reference circuit further comprises a temperature compensation module, wherein the temperature compensation module comprises a sensor unit and a voltage dividing unit, and the sensor unit is electrically connected to the voltage dividing unit.
Further, the sensor unit employs a DS18B20 chip.
Drawings
Fig. 1 is a block diagram of an embodiment of a voltage source reference circuit according to the present invention;
fig. 2 is a circuit diagram of a reference voltage source module of a voltage source reference circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of an analog-to-digital conversion module of a voltage source reference circuit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a temperature compensation module of a voltage source reference circuit according to an embodiment of the present invention.
Detailed Description
The conception and the resulting technical effects of the present invention will be described clearly and completely with reference to the following embodiments, so that the objects, features and effects of the present invention can be fully understood. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention.
In the description of the present invention, if an orientation description is referred to, for example, the directions or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, only for convenience of description and simplification of description, and it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. If a feature is referred to as being "disposed," "secured," "connected," or "mounted" to another feature, it can be directly disposed, secured, or connected to the other feature or indirectly disposed, secured, connected, or mounted to the other feature.
In the description of the embodiments of the present invention, if "a plurality" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "more than", "less than" or "within" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.
Example 1: referring to fig. 1, a block diagram of a voltage source reference circuit according to an embodiment of the present invention is shown, which specifically includes:
the device comprises a main control module, a reference voltage source module, an analog-to-digital conversion module and a temperature compensation module, wherein the reference voltage source module is connected with the analog-to-digital conversion module, and the analog-to-digital conversion module and the temperature compensation module are respectively and electrically connected with the main control module.
Specifically, the main control module provides starting support for the whole voltage source reference circuit, the reference voltage source module provides reference voltage for the whole voltage source reference circuit, the analog-to-digital conversion module provides analog signals for the whole voltage source reference circuit and converts the analog signals into digital signals to be output, and the temperature compensation module is used for measuring the temperature of the whole voltage source reference circuit and outputting the digital signals to the main control module so as to control temperature drift.
Example 2: referring to fig. 2, a reference voltage source module circuit diagram of a voltage source reference circuit, wherein the reference voltage source module includes a reference voltage stabilization unit, a precise resistor network unit, an operational amplifier unit and a filtering unit, wherein the filtering unit includes a first filtering unit and a second filtering unit, and the reference voltage stabilization unit, the first filtering unit, the precise resistor network unit, the operational amplifier unit and the second filtering unit are electrically connected in sequence.
Further, the reference voltage stabilizing unit 1 includes a reference voltage stabilizing chip, a second pin and a third pin of the chip are respectively grounded, a fourth pin is connected with a power supply, one end of the first pin is connected with the power supply through a first resistor R1, the other end of the first pin is connected with the first filtering unit, and meanwhile, the first pin is also directly connected with the accurate resistor network unit.
Further, the accurate resistor network unit 2 includes an accurate resistor network chip, the first pin and the ninth pin of the accurate resistor network chip are grounded, the fourth pin is connected to the reference voltage stabilizing unit 1, the seventh pin and the eighth pin are grounded through the second filtering unit after being connected, and the seventh pin and the eighth pin are also connected to the positive input terminal of the operational amplifier unit 3 after being connected.
Specifically, the first filter unit is composed of two capacitors C1 and C2 connected in parallel, and the second filter unit is composed of a single capacitor C3, and the filter mainly functions to filter alternating current existing in a circuit, so that the direct current is smoother and more stable;
specifically, the model of the accurate resistor network unit 2 adopted in this embodiment is LT5400-7, the partial pressure temperature drift is extremely small, the temperature drift of this unit is extremely small, 0.2ppm, the reference voltage stabilization unit 1 adopts the reference voltage stabilization chip with the model LM399AH, the temperature drift of this reference voltage stabilization chip is 0.5ppm, if the output of the reference voltage stabilization unit 1 is 6.95V, the voltage is about 2.78V after being divided by the accurate resistor network unit 2, the operational amplifier 3 is connected at the rear end of the accurate resistor network unit 2, the purpose is to reduce the impedance of the reference voltage source VERF end, and the final output end voltage is equal to the reference voltage of the VERF end.
Example 3: as shown in fig. 3, which is a circuit diagram of an analog-to-digital conversion module of a voltage source reference circuit according to an embodiment of the present invention, the analog-to-digital conversion module includes an analog-to-digital conversion unit and a third filtering unit, and the analog-to-digital conversion unit is electrically connected to the third filtering unit.
Specifically, the analog-to-digital conversion unit adopts an LTC2415 analog-to-digital converter which is a 24-bit analog-to-digital converter, has small gain error and low noise, and is suitable for being used as a high-precision weighing system.
Specifically, the third filters respectively include filtering branches formed by C5, C6, C7 and C8, wherein the branch formed by C5 filters the voltage source, the branch formed by C6 filters the voltage source reference voltage VERF, the branch formed by C7 filters the detection voltage port VIN +, the branch formed by C8 filters the voltage between the voltage source reference voltage port VERF and the detection voltage port VIN +, and the detection voltage port detects the voltage difference between the fifth pin IN + and the sixth pin IN-of the analog-to-digital conversion unit 4, so as to accurately measure the voltage.
Example 4: fig. 4 is a circuit diagram of a temperature compensation module of a voltage source reference circuit according to an embodiment of the present invention, where the temperature compensation module includes a sensor unit and a voltage dividing unit, and the sensor unit is electrically connected to the voltage dividing unit.
Specifically, the voltage dividing unit is a 10K resistor R2, and can divide voltage when power supply of the power supply terminal SYS3V3 is abnormal, so as to protect the main control unit, wherein the unit terminal SYS3V3 represents the 3.3V dc voltage output by the main control module.
Specifically, the sensor unit adopts a DS18B20 digital temperature sensor, and has the characteristics of small volume, low hardware cost, strong anti-interference capability and high precision.
Example 5: the main control module in this embodiment includes a control unit, a storage unit, and a start mode setting unit, where the storage unit and the start mode setting unit are electrically connected to the control unit, respectively.
Furthermore, the memory unit adopts FM25L256, and has the advantages of low power consumption, high performance and wide working temperature range.
Specifically, the starting mode setting unit comprises a resistor, one end of the resistor is connected with the ground end, the other end of the resistor is connected with a port of the BOOT of the control unit, different starting modes can be selected by the port, the starting mode selected when the value of the BOOT of the port is 0 is a user flash memory mode, data cannot be lost even under the condition that the power is not supplied, and the starting mode has the advantages of low power consumption and difficulty in physical damage.
The pins referred to in the above embodiments are all corresponding pin numbers of the pins in the drawings, for example, the first pin, which is pin 1 of the corresponding unit in the drawings, and similarly, the ninth pin, which is pin 9 of the corresponding unit in the drawings.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
Claims (10)
1. A voltage source reference circuit, comprising:
the device comprises a main control module, a reference voltage source module, an analog-to-digital conversion module and a temperature compensation module, wherein the reference voltage source module is connected with the analog-to-digital conversion module, and the analog-to-digital conversion module and the temperature compensation module are respectively and electrically connected with the main control module.
2. The voltage source reference circuit according to claim 1, wherein the main control module comprises a control unit, a storage unit, and a start mode setting unit, and the storage unit and the start mode setting unit are electrically connected to the control unit respectively.
3. A voltage source reference circuit according to claim 2, wherein said memory cells are FM25L256 chips.
4. The voltage source reference circuit according to claim 1, wherein the reference voltage source module comprises a reference voltage stabilization unit, a precise resistor network unit, an operational amplifier unit and a filtering unit, the filtering unit comprises a first filtering unit and a second filtering unit, and the reference voltage stabilization unit, the first filtering unit, the precise resistor network unit, the operational amplifier unit and the second filtering unit are electrically connected in sequence.
5. A voltage source reference circuit according to claim 4, wherein the reference voltage regulation unit comprises a reference voltage regulation chip, the second pin and the third pin of the reference voltage regulation chip are respectively connected to ground, the fourth pin is connected to a power supply, one end of the first pin is connected to the power supply through a first resistor, the other end of the first pin is connected to the first filtering unit, and meanwhile, the first pin is also directly connected to the accurate resistor network unit.
6. The voltage source reference circuit according to claim 4, wherein the precision resistor network unit comprises a precision resistor network chip, the first pin and the ninth pin of the precision resistor network chip are grounded, the fourth pin is connected to the reference voltage stabilization unit, the seventh pin and the eighth pin are connected to ground through the second filtering unit, and the seventh pin and the eighth pin are connected to a non-inverting input terminal of the operational amplifier unit.
7. The voltage source reference circuit of claim 1, wherein the analog-to-digital conversion module comprises an analog-to-digital conversion unit and a third filtering unit, and the analog-to-digital conversion unit is electrically connected with the third filtering unit.
8. A voltage source reference circuit according to claim 7, wherein the analogue to digital conversion unit is implemented using an LTC2415 chip.
9. A voltage source reference circuit according to claim 1, wherein said temperature compensation module comprises a sensor unit and a voltage divider unit, said sensor unit and said voltage divider unit being electrically connected.
10. A voltage source reference circuit according to claim 9, wherein said sensor unit is a DS18B20 chip.
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| CN201922075164.1U CN211928460U (en) | 2019-11-25 | 2019-11-25 | Voltage source reference circuit |
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| CN201922075164.1U CN211928460U (en) | 2019-11-25 | 2019-11-25 | Voltage source reference circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112833921A (en) * | 2020-12-31 | 2021-05-25 | 广州导远电子科技有限公司 | Single-axis gyroscope circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112833921A (en) * | 2020-12-31 | 2021-05-25 | 广州导远电子科技有限公司 | Single-axis gyroscope circuit |
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