CN116448279A - Self-adaptive temperature slope calibration method and system - Google Patents
Self-adaptive temperature slope calibration method and system Download PDFInfo
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- CN116448279A CN116448279A CN202211551545.2A CN202211551545A CN116448279A CN 116448279 A CN116448279 A CN 116448279A CN 202211551545 A CN202211551545 A CN 202211551545A CN 116448279 A CN116448279 A CN 116448279A
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- 230000003044 adaptive effect Effects 0.000 claims description 17
- 238000001514 detection method Methods 0.000 abstract 1
- 238000004364 calculation method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 239000004429 Calibre Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000012887 quadratic function Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000010259 detection of temperature stimulus Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/005—Calibration
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Abstract
The invention provides a self-adaptive temperature slope calibration method and a self-adaptive temperature slope calibration system for a thermal sensor, wherein the method comprises the following steps: acquiring parameters of a thermal sensor in a temperature environment; calibrating a temperature slope of the thermal sensor using parameters of the thermal sensor obtained in the temperature environment without using parameters of the thermal sensor in other temperature environments; the temperature slope of the thermal sensor is stored for subsequent temperature detection. Because only one temperature environment needs to be established, the system has lower cost and can complete temperature slope calibration in shorter time.
Description
Technical Field
The present invention relates to temperature sensing and sensing, and more particularly to a method and system for calibrating a temperature slope of a temperature sensor using a temperature environment.
Background
The base-emitter junction of a bipolar junction transistor (bipolar junction transistor, BJT) has a predictable transfer function (predictable transfer function) that is temperature dependent. Thus, one or more BJTs may be used to measure the temperature of the device. Because of the differences in semiconductor processes, thermal sensors need to be calibrated to determine offset and temperature slope (temperature slope) for further use, where calibrating the temperature slope requires obtaining two BJT parameters in two different temperature environments, e.g., 30 ℃ and 85 ℃, and then using the two BJT parameters and the two different temperatures to determine the temperature slope. However, establishing two different temperature environments requires higher costs and also results in longer times for calibrating the temperature slope.
Disclosure of Invention
It is therefore an object of the present invention to provide an adaptive temperature slope calibration method and related system, which can determine the temperature slope of a thermal sensor by using BJT parameters obtained in only one temperature environment, so as to solve the above-mentioned problems.
According to one embodiment of the present invention, an adaptive temperature slope calibration method of a thermal sensor includes the steps of: acquiring parameters of a thermal sensor in a temperature environment; calibrating a temperature slope of the thermal sensor using parameters of the thermal sensor obtained in other temperature environments without using the parameters of the thermal sensor in the temperature environments; the temperature slope of the thermal sensor is stored for subsequent use in detecting temperature.
According to one embodiment of the present invention, an adaptive temperature slope calibration system is disclosed that includes a thermal sensor, a sensing circuit, and a temperature slope calibration unit. The sensing circuit is used for obtaining parameters of the thermal sensor in a temperature environment. And a temperature slope calibration unit for calibrating a temperature slope of the thermal sensor using the parameter of the thermal sensor obtained in the temperature environment without using the parameter of the thermal sensor in the other temperature environment, wherein the temperature slope of the thermal sensor is stored for use in a subsequent detection of temperature.
The present invention can calculate a temperature slope using BJT parameters obtained in only one temperature environment. Because only one temperature environment needs to be established, the system has lower cost and can complete temperature slope calibration in shorter time.
These and other objects of the present invention will no doubt become obvious to those of ordinary skill in the art after having read the following detailed description of the preferred embodiments which are illustrated in the various drawing figures.
Drawings
The invention may be more completely understood in consideration of the following detailed description and examples in connection with the accompanying drawings, in which:
FIG. 1 is a system according to one embodiment of the invention.
FIG. 2 is a schematic diagram illustrating different extreme (burner) conditions and their corresponding temperature slopes, according to one embodiment of the invention.
Fig. 3 is a schematic diagram showing different terminal conditions and their corresponding temperature slopes according to another embodiment of the present invention.
FIG. 4 is a flow chart of an adaptive temperature slope correction method according to one embodiment of the present invention.
Detailed Description
Certain terms are used throughout the description and claims to refer to particular components. Those of ordinary skill in the art will appreciate that manufacturers may refer to a component by different names. The description and claims do not take the form of an element with differences in names, but rather with differences in functions of the elements as references to differences. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. Furthermore, the term "coupled" as used herein includes any direct or indirect electrical connection. Thus, if a first device is electrically connected to a second device, that connection may be made directly to the second device or indirectly to the second device through other devices or connection means.
FIG. 1 is a system 100 according to one embodiment of the invention. As shown in fig. 1, the system 100 includes a thermal sensor 110, a sensing circuit 120, a temperature slope calibration unit 130, and a temperature calculation circuit 140. In the present embodiment, the thermal sensor 110 includes at least one BJT, and the system 100 is configured to use parameters of the BJT to obtain a calibration of the temperature slope to determine the current temperature of the device including the thermal sensor 110.
As described in the background of the invention, the conventional temperature slope calibration needs to be performed at two different temperatures, and the establishment of two different temperature environments requires higher cost, which also makes the time for calibrating the temperature slope longer. To address this problem, system 100 is designed to determine the temperature slope using BJT parameters obtained in only one temperature environment. Specifically, the device containing the thermal sensor 110 may be placed in an ambient temperature (e.g., 30 ℃) environment, and the sensing circuit 120 senses the thermal sensor 110 to obtain parameters of the thermal sensor 110. In one embodiment, the parameter may be a base-emitter Voltage (VBE) of the BJT, wherein the base-emitter voltage may be obtained by applying a fixed bias current to the BJT and measuring a voltage difference between the base and the emitter. In one embodiment, the parameter may be the delta base-emitter voltage (delta VBE) of a BJT, wherein the delta base-emitter voltage may be obtained by applying a fixed bias current to two or more BJTs and calibrating the difference between the base-emitter voltages of the two or more BJTs (e.g., if two BJTs are included, different bias currents may be applied to the two BJTs and two VBE values may be obtained, the difference between the two VBEs, i.e., delta VBE, may be taken, or if one BJT is included, two bias currents may be applied to the BJT and two VBE values may be obtained, the difference between the two VBEs may be taken, i.e., delta VBE). In one embodiment, the base-emitter voltage of the BJT or the delta base-emitter voltage of the BJT may be encoded or performed by an analog-to-digital conversion operation to generate a code as a parameter of the thermal sensor 110. In one embodiment, the base-emitter voltage of the BJT or the delta base-emitter voltage of the BJT may be processed by a voltage-to-frequency converter to generate a frequency signal. In one embodiment, the parameter may be a current of the BJT (e.g., a current flowing from an emitter of the BJT). It should be noted that the above-mentioned embodiments are merely illustrative, and not restrictive of the invention. The parameters may be of any type as long as they are generated from the measurement results of the BJT.
After obtaining the parameter of the thermal sensor 110 at normal temperature (single temperature), the temperature slope calibration unit 130 may calculate the temperature slope of the thermal sensor 110 using the parameter. In the present embodiment, the temperature slope of the thermal sensor 110 may be calculated using the following formula:
T_slope＝T_slope_golden+((P_calibrate/P_golden)-1)*C………(1)；
wherein "t_slope" is the adaptive temperature slope; "P_calibre" is a parameter of the thermal sensor 110 at normal temperature, and may be, for example, a parameter of the thermal sensor 110 sensed by the sensing circuit (e.g., VBE or delta VBE of a BJT) at normal temperature of 30 ℃ as described above; "t_slope_golden" is a reference value for the temperature slope, which may be, for example, the ideal temperature slope for a BJT without any semiconductor process errors; "P_golden" is a reference value for the parameter of the thermal sensor 110, and may be, for example, an ideal VBE or delta VBE value corresponding to the BJT at a normal temperature of 30 ℃ as described above without any semiconductor process errors; "C" is a constant. By using the above formula (1), the temperature slope of the thermal sensor 110 can be easily calculated using only one parameter sensed by the sensing circuit 120. The temperature at which "p_calibre" is sensed should be the same value as the temperature at which "p_golden" is obtained. Note that 30 ℃ is only an example here, and other temperatures such as 25 ℃, 18 ℃ and the like are also possible.
FIG. 2 is a schematic diagram illustrating different extreme (burner) conditions and their corresponding temperature slopes, according to one embodiment of the invention. As shown in fig. 2, the parameter is the base-emitter voltage, which is a linear relationship with temperature for the thermal sensor 110. By using equation (1), for any extreme case of the thermal sensor 110 (e.g., slow BJT (bjt_ss), typical BJT (bjt_tt), and fast BJT (bjt_ff) as shown in fig. 2) (the temperature slope of BJT may deviate from an ideal value due to the difference of semiconductor process, but it always varies between bjt_ss and bjt_ff), the slope of the linear relationship between the base-emitter voltage and temperature of the thermal sensor 110 may be determined.
Fig. 3 is a schematic diagram showing different terminal conditions and their corresponding temperature slopes according to another embodiment of the present invention. As shown in FIG. 3, the parameter is the delta base-emitter voltage, which is a linear relationship with temperature for the thermal sensor 110. By using equation (1), the slope of the linear relationship between delta base-emitter voltage and temperature of thermal sensor 110 can be determined for any extreme case of thermal sensor 110, such as slow BJT (bjt_ss), typical BJT (bjt_tt), and fast BJT (bjt_ff) as shown in fig. 3.
It should be noted that the above formula (1) is an exemplary illustration, and is not a limitation of the present invention. In other embodiments, the temperature gradient of the thermal sensor 110 can be easily calculated by using the parameters sensed by the sensing circuit 120 at a single temperature, and other calculation steps can be used to calculate the temperature gradient, for example, the temperature gradient can be a quadratic function of the parameters (quadratic function).
In addition, the parameters obtained at room temperature may be used as an offset (offset) for subsequent use when the system 100 needs to detect temperature.
After the temperature slope calibration unit 130 determines the adaptive temperature slope, the temperature calculation circuit 140 may store the temperature slope and use the temperature slope and offset to determine the temperature. For example, when the system 100 needs to determine a temperature, the temperature calculation circuit 140 may calculate the current temperature using the current sensed parameter of the thermal sensor 110 and the previously determined temperature slope and offset, i.e., the current temperature is equal to the temperature slope multiplied by the sum of the currently detected parameter and the offset.
FIG. 4 is a flow chart of an adaptive temperature slope correction method according to one embodiment of the present invention. With reference to fig. 4 and the above embodiments, the flow is described as follows.
Step 400: the flow starts.
Step 402: a temperature environment is set.
Step 404: parameters of the thermal sensor in the temperature environment are acquired.
Step 406: and calibrating the temperature slope of the thermal sensor according to the parameter of the thermal sensor.
Step 408: the temperature slope of the thermal sensor is stored for subsequent use in detecting temperature.
Briefly, in the adaptive temperature slope calibration method of the present invention, the temperature slope may be calculated using BJT parameters obtained in only one temperature environment. Therefore, the calibration step has lower cost because only one temperature environment needs to be established, and the system can complete the temperature slope calibration in a shorter time.
Those skilled in the art will readily recognize that many modifications and variations of the apparatus and methods are possible while retaining the teachings of the present invention. Accordingly, the above disclosure should be construed as limited only by the appended claims.
Claims (16)
1. An adaptive temperature slope calibration method, comprising:
acquiring parameters of a thermal sensor in a temperature environment;
calibrating a temperature slope of the thermal sensor with the parameter of the thermal sensor obtained in the temperature environment without using the parameter of the thermal sensor in other temperature environments; and
the temperature slope of the thermal sensor is stored for use in subsequently detecting a temperature.
2. The adaptive temperature slope calibration method according to claim 1, wherein the thermal sensor comprises at least one bipolar junction transistor BJT, and the step of acquiring parameters of the thermal sensor in the temperature environment comprises:
parameters of the thermal sensor are generated from the base-emitter voltage of the BJT.
3. The adaptive temperature slope calibration method according to claim 1, wherein the thermal sensor comprises at least one BJT, and the step of acquiring parameters of the thermal sensor in the temperature environment comprises:
parameters of the thermal sensor are generated from the delta base-emitter voltage of the BJT.
4. The adaptive temperature slope calibration method according to claim 1, wherein the thermal sensor comprises at least one BJT, and the step of acquiring parameters of the thermal sensor in the temperature environment comprises:
generating a frequency signal as a parameter of the thermal sensor based on a base-emitter voltage of the BJT or a delta base-emitter voltage of the BJT.
5. The adaptive temperature slope calibration method according to claim 1, wherein the thermal sensor comprises at least one BJT, and the step of acquiring parameters of the thermal sensor in the temperature environment comprises:
and generating parameters of the thermal sensor according to the current of the BJT.
6. The adaptive temperature slope calibration method according to claim 1, wherein the step of calibrating the temperature slope of the thermal sensor using the parameters of the thermal sensor obtained in the temperature environment without using the parameters of the thermal sensor in other temperature environments comprises:
the temperature slope of the thermal sensor is calculated using the parameter of the thermal sensor, a reference value of the temperature slope, and a reference value of the parameter of the thermal sensor obtained in the temperature environment.
7. The adaptive temperature slope calibration method according to claim 6, wherein the step of calculating the temperature slope of the thermal sensor using the parameter of the thermal sensor, the reference value of the temperature slope, and the reference value of the parameter of the thermal sensor obtained in the temperature environment comprises:
calculating the parameter of the thermal sensor using the following formula:
T_slope＝T_slope_golden+((P_calibrate/P_golden)-1)*C
where "t_slope" is the temperature slope, "p_slope" is a parameter of the thermal sensor obtained under the temperature environment, "t_slope_golden" is a reference value of the temperature slope, "p_golden" is a reference value of the parameter of the thermal sensor, and "C" is a constant.
8. The adaptive temperature slope calibration method according to claim 6, wherein the thermal sensor comprises at least one BJT, the parameter of the thermal sensor obtained in the temperature environment being generated based on a base-emitter voltage of the BJT or a delta base-emitter voltage of the BJT.
9. An adaptive temperature slope calibration system, comprising:
a thermal sensor;
a sensing circuit coupled to the thermal sensor for obtaining a parameter of the thermal sensor in a temperature environment; and
a temperature gradient calibration unit for calibrating a temperature gradient of the thermal sensor by using the parameter of the thermal sensor obtained in the temperature environment without using the parameter of the thermal sensor in other temperature environments,
wherein the temperature slope of the thermal sensor is stored for use in subsequently detecting temperature.
10. The system of claim 9, wherein the thermal sensor comprises at least one BJT, and the sensing circuit generates the parameter of the thermal sensor from a base-emitter voltage of the BJT.
11. The system of claim 9, wherein the thermal sensor comprises at least one BJT, and the sensing circuit generates the parameter of the thermal sensor from a delta base-emitter voltage of the BJT.
12. The system of claim 9, wherein the thermal sensor comprises at least one BJT and the sensing circuit generates a frequency signal as the parameter of the thermal sensor based on a base-emitter voltage or a delta base-emitter voltage of the BJT.
13. The system of claim 9, wherein the thermal sensor comprises at least one BJT, and the sensing circuit generates the parameter of the thermal sensor from a current of the BJT.
14. The system of claim 9, wherein the temperature slope calibration unit calculates the temperature slope of the thermal sensor using the parameter of the thermal sensor, a reference value of the temperature slope, and a reference value of the parameter of the thermal sensor obtained in the temperature environment.
15. The system of claim 14, wherein the system comprises a plurality of sensors,
the temperature slope calibration unit calculates the parameter of the thermal sensor using the following formula:
T_slope＝T_slope_golden+((P_calibrate/P_golden)-1)*C
where "t_slope" is the temperature slope, "p_slope" is a parameter of the thermal sensor obtained under the temperature environment, "t_slope_golden" is a reference value of the temperature slope, "p_golden" is a reference value of the parameter of the thermal sensor, and "C" is a constant.
16. The system of claim 14, wherein the thermal sensor comprises at least one BJT, and the temperature slope calibration unit generates the parameter of the thermal sensor obtained in the temperature environment from a base-emitter voltage of the BJT or a delta base-emitter voltage of the BJT.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US63/299,420 | 2022-01-14 | ||
| US17/990,730 US20230228629A1 (en) | 2022-01-14 | 2022-11-20 | Adaptive temperature slope calibration method of a thermal sensor and associated system |
| US17/990,730 | 2022-11-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116448279A true CN116448279A (en) | 2023-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211551545.2A Pending CN116448279A (en) | 2022-01-14 | 2022-12-05 | Self-adaptive temperature slope calibration method and system |
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| CN (1) | CN116448279A (en) |
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