CN111930171A - Low-temperature-drift precision voltage output circuit - Google Patents
Low-temperature-drift precision voltage output circuit Download PDFInfo
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- CN111930171A CN111930171A CN202011031244.8A CN202011031244A CN111930171A CN 111930171 A CN111930171 A CN 111930171A CN 202011031244 A CN202011031244 A CN 202011031244A CN 111930171 A CN111930171 A CN 111930171A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/567—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for temperature compensation
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/575—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices characterised by the feedback circuit
Abstract
The invention relates to a low-temperature-drift precision voltage output circuit which can realize low-temperature-drift precision voltage output and comprises a precision reference source circuit, a voltage division circuit and a following circuit. The precision reference source circuit is used for power supply conversion, generates a 5V reference voltage and provides the 5V reference voltage for the voltage division circuit; the voltage division circuit comprises a negative temperature coefficient compensation circuit and a positive temperature coefficient compensation circuit which are connected in series; performing voltage division and temperature drift compensation on the 5V reference voltage provided by the precision reference source circuit, and outputting the voltage subjected to voltage division compensation to the following circuit; the following circuit follows the voltage output by the voltage division circuit and outputs precise voltage. The voltage regulator overcomes the defects of large temperature drift, low output precision and limited use occasions of the existing precision voltage circuit, can be directly used in the occasions with the wide working temperature range of-55-125 ℃, and has the temperature drift within the whole temperature range of only 0.1mV and the output precision of less than 0.01 mV.
Description
Technical Field
The invention relates to a precision voltage output circuit which can realize low-temperature-drift precision voltage output and can meet the requirements of places with wide temperature working range and low temperature drift.
Background
In the precision guided weapon system, in order to provide accurate voltage for AD conversion circuit, its signal comparison processing is convenient. Meanwhile, the system working environment is severe, and the voltage at the place is generally required to have the characteristics of high precision and low temperature drift.
Because the existing circuit has low precision and large high-low temperature change range, the circuit can only meet the working condition of normal temperature, and cannot meet the precision requirement under the severe working environment condition, so the circuit cannot be used and needs to be improved.
Disclosure of Invention
The invention aims to solve the defects of the existing voltage output circuit and provide a voltage output circuit which meets the requirements of high precision and low temperature drift.
The technical solution for realizing the purpose of the invention is as follows:
a low-temperature-drift precision voltage output circuit comprises a precision reference source circuit, a voltage division circuit and a following circuit;
the precision reference source circuit is used for power supply conversion, generates a 5V reference voltage and provides the 5V reference voltage for the voltage division circuit;
the voltage division circuit comprises a negative temperature coefficient compensation circuit and a positive temperature coefficient compensation circuit which are connected in series; performing voltage division and temperature drift compensation on the 5V reference voltage provided by the precision reference source circuit, and outputting the voltage subjected to voltage division compensation to the following circuit;
the following circuit follows the voltage output by the voltage division circuit and outputs precise voltage.
Furthermore, the precision reference source circuit comprises a precision voltage-stabilizing source, and the input end and the output end of the precision voltage-stabilizing source are respectively grounded through a capacitor.
Further, the negative temperature coefficient compensation circuit is connected in series-parallel with the conventional resistor by the negative temperature coefficient thermistor RNT.
Further, the conventional resistor includes a first resistor R1, a second resistor R2, and a third resistor R3;
the third resistor R3 is connected with the negative temperature coefficient thermistor RNT in series and then connected with the second resistor R2 in parallel, one end of the parallel circuit is connected with the first resistor R1 in series, the other end of the first resistor R1 is connected with the 5V reference voltage output by the precision reference source circuit, and the other end of the parallel circuit is connected with the positive temperature coefficient compensation circuit and serves as the output of the voltage division circuit.
Further, the resistance value of the ntc thermistor RNT has a relationship with temperature:
R=R0 *expB (1/T–1/T0)
in the formula, R: a resistance value at a first ambient temperature T;
r0: a resistance value at a second ambient temperature T0;
b: constant of negative temperature coefficient thermistor.
Furthermore, the positive temperature coefficient compensation circuit is formed by connecting a positive temperature coefficient temperature sensor resistor RPT and a fourth resistor in series, the other end of the positive temperature coefficient temperature sensor resistor RPT is grounded GND, and the other end of the fourth resistor R4 is connected with the negative temperature coefficient compensation circuit and used as the output of the voltage division circuit.
Furthermore, the follower circuit comprises an integrated operational amplifier, the voltage output by the voltage division circuit is input to a positive input end of the integrated operational amplifier, the output end of the integrated operational amplifier outputs precise voltage, and meanwhile, the output end of the integrated operational amplifier feeds back to a negative input end of the integrated operational amplifier.
The invention has the advantages of realizing high-precision voltage output, solving the defects of larger temperature drift, low output precision and limited use occasion of the existing precision voltage circuit, being directly used in the occasion with a wide working temperature range of-55-125 ℃, the temperature drift of the whole temperature range being only within 0.1mV, and the output precision being less than 0.01 mV.
Drawings
FIG. 1 is a circuit block diagram of a low temperature drift precision voltage output circuit according to the present invention.
FIG. 2a is a circuit diagram of a precision reference source circuit of a low temperature drift precision voltage output circuit according to the present invention.
FIG. 2b is a graph of the output voltage of the precision reference source circuit versus temperature.
FIG. 3 is a circuit diagram of a voltage divider circuit of a low-temperature-drift precision voltage output circuit according to the present invention.
FIG. 4a is a circuit diagram of the negative temperature coefficient compensation circuit of the low temperature drift precision voltage output circuit of the present invention.
FIG. 4b is the temperature dependence of the resistance of the thermistor RNT in the negative temperature coefficient compensation circuit. Curve line
FIG. 5a is a circuit diagram of a PTC compensation circuit of a low-temperature-drift precision voltage output circuit according to the present invention.
Fig. 5b is a graph showing the variation of the total resistance value of the ptc compensation circuit with temperature.
FIG. 6 is a circuit diagram of a follower circuit of a low temperature drift precision voltage output circuit according to the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the low-temperature-drift precision voltage output circuit of the present embodiment includes a precision reference source circuit 11, a voltage divider circuit 12 (including a negative temperature coefficient compensation circuit 13 and a positive temperature coefficient compensation circuit 14), and a follower circuit 15.
As shown in fig. 2a, the precision reference source circuit comprises a precision regulator U1 and capacitors C1 and C2. The precision reference circuit mainly adopts power supply conversion to generate high-precision and low-temperature-drift 5V reference voltage, the precision of the output voltage is high, the output voltage is 5.000V +/-0.003V, the temperature drift is 3 ppm/DEG C, and when the working temperature is from minus 55 ℃ to 125 ℃, the drift of the output voltage is 2.7 mV. The output voltage versus temperature curve is shown in fig. 2 b.
As shown in FIG. 3, when the operating temperature is from-55 ℃ to 125 ℃, since the final output voltage of the post-stage follower is a negative temperature coefficient, if no temperature compensation is performed, the output drift reaches +8mV when the post-stage follower operates at-55 ℃, the output drift reaches-10 mV when the post-stage follower operates at 125 ℃, and therefore the temperature compensation design is required. The voltage division circuit is composed of a negative temperature coefficient compensation circuit and a positive temperature coefficient compensation circuit, and temperature compensation of the voltage division circuit is completed.
As shown in FIG. 4a, the negative temperature coefficient compensation circuit comprises resistors R1, R2, R3 and a negative temperature coefficient thermistor RNT, wherein the resistor R3 is connected with the negative temperature coefficient thermistor RNT in series and then connected with the resistor R2 in parallel, one end of the parallel circuit is connected with the resistor R1 in series, and the other end of the resistor R1 is connected with +5V voltage output by the precision reference source circuit. The other end of the parallel circuit is connected with the positive temperature coefficient compensation circuit and is used as the voltage division output of the voltage division circuit.
When the working temperature is from-55 ℃ to 125 ℃, the total resistance value linearly decreases along with the temperature increase. The resistance of the thermistor RNT is related to temperature as follows:
R=R0 *expB (1/T–1/T0) （1）
wherein, R: resistance value at ambient temperature T (K) (K: absolute temperature);
r0: resistance value at ambient temperature T0 (K);
b: b constant of thermistor.
As shown in fig. 4B, since the relationship between the resistance value of the thermistor RNT and the temperature is a negative temperature index curve, when B is 4100 and the normal temperature (25 ℃) RNT is 1k Ω, the low temperature (-55 ℃) RNT becomes 154.92k Ω, the high temperature (125 ℃) RNT becomes 0.0316k Ω, and the total resistance of the resistor R2/(RNT + R3) is linearly changed at a negative temperature by connecting the resistor R3 in series and connecting the resistor R2 in parallel.
As shown in fig. 5a, the ptc compensation circuit is composed of a resistor R4 and a ptc temperature sensor resistor RPT connected in series, the other end of the resistor RPT is grounded GND, and the other end of the resistor R4 is connected to the negative temperature coefficient compensation circuit and is used as the divided voltage output of the voltage divider circuit. When the working temperature is from-55 ℃ to 125 ℃, the total resistance value linearly increases along with the temperature increase. The temperature profile is shown in fig. 5 b.
As shown in fig. 6, the precision divided voltage value output by the voltage dividing circuit is input to the follower circuit, and the follower circuit outputs the precision voltage, thereby completing the output of the high precision voltage. The follower circuit comprises an integrated operational amplifier NA, a precise voltage division value output by the voltage division circuit is input to a positive input end of the integrated operational amplifier NA, and the positive input end is simultaneously grounded GND through a capacitor C3. The output end of the integrated operational amplifier NA outputs precise voltage, and meanwhile, the output end of the integrated operational amplifier NA is fed back to the inverting input end of the integrated operational amplifier NA.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A low-temperature-drift precision voltage output circuit is characterized by comprising a precision reference source circuit, a voltage division circuit and a following circuit;
the precision reference source circuit is used for power supply conversion, generates a 5V reference voltage and provides the 5V reference voltage for the voltage division circuit;
the voltage division circuit comprises a negative temperature coefficient compensation circuit and a positive temperature coefficient compensation circuit which are connected in series; performing voltage division and temperature drift compensation on the 5V reference voltage provided by the precision reference source circuit, and outputting the voltage subjected to voltage division compensation to the following circuit;
the following circuit follows the voltage output by the voltage division circuit and outputs precise voltage.
2. The low temperature drift precision voltage output circuit according to claim 1, wherein the precision reference source circuit comprises a precision voltage regulator, and the input end and the output end of the precision voltage regulator are respectively grounded through a capacitor.
3. The low-temperature-drift precision voltage output circuit as claimed in claim 1, wherein the negative temperature coefficient compensation circuit is formed by connecting a negative temperature coefficient thermistor (RNT) in series-parallel with a conventional resistor.
4. The low-temperature-drift precision voltage output circuit according to claim 3, wherein the normal resistor comprises a first resistor R1, a second resistor R2 and a third resistor R3;
the third resistor R3 is connected with the negative temperature coefficient thermistor RNT in series and then connected with the second resistor R2 in parallel, one end of the parallel circuit is connected with the first resistor R1 in series, the other end of the first resistor R1 is connected with the 5V reference voltage output by the precision reference source circuit, and the other end of the parallel circuit is connected with the positive temperature coefficient compensation circuit and serves as the output of the voltage division circuit.
5. The low temperature drift precision voltage output circuit according to claim 3, wherein the resistance value of the negative temperature coefficient thermistor RNT has a relationship with temperature:
R=R0 *expB (1/T–1/T0)
in the formula, R: a resistance value at a first ambient temperature T;
r0: a resistance value at a second ambient temperature T0;
b: constant of negative temperature coefficient thermistor.
6. The low-temperature-drift precision voltage output circuit according to claim 1, wherein the positive temperature coefficient compensation circuit is formed by connecting a positive temperature coefficient temperature sensor Resistor (RPT) in series with a fourth resistor, the other end of the positive temperature coefficient temperature sensor Resistor (RPT) is connected to the GND, and the other end of the fourth resistor R4 is connected with the negative temperature coefficient compensation circuit and used as the output of the voltage division circuit.
7. The low temperature drift precision voltage output circuit of claim 1, wherein the follower circuit comprises an integrated operational amplifier, the voltage output by the voltage divider circuit is input to a non-inverting input terminal of the integrated operational amplifier, the output terminal of the integrated operational amplifier outputs the precision voltage, and the output terminal is fed back to an inverting input terminal of the integrated operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011031244.8A CN111930171A (en) | 2020-09-27 | 2020-09-27 | Low-temperature-drift precision voltage output circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011031244.8A CN111930171A (en) | 2020-09-27 | 2020-09-27 | Low-temperature-drift precision voltage output circuit |
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| CN111930171A true CN111930171A (en) | 2020-11-13 |
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| CN202011031244.8A Pending CN111930171A (en) | 2020-09-27 | 2020-09-27 | Low-temperature-drift precision voltage output circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112583071A (en) * | 2020-11-27 | 2021-03-30 | 上海航天控制技术研究所 | Power supply system for deep space exploration separation monitoring satellite |
| CN114115416A (en) * | 2021-11-10 | 2022-03-01 | 吕梁学院 | Reference source for precisely adjusting voltage |
-
2020
- 2020-09-27 CN CN202011031244.8A patent/CN111930171A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112583071A (en) * | 2020-11-27 | 2021-03-30 | 上海航天控制技术研究所 | Power supply system for deep space exploration separation monitoring satellite |
| CN114115416A (en) * | 2021-11-10 | 2022-03-01 | 吕梁学院 | Reference source for precisely adjusting voltage |
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