CN113375817B - Display device of nonlinear temperature - Google Patents
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- CN113375817B CN113375817B CN202110695848.0A CN202110695848A CN113375817B CN 113375817 B CN113375817 B CN 113375817B CN 202110695848 A CN202110695848 A CN 202110695848A CN 113375817 B CN113375817 B CN 113375817B
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- 238000012545 processing Methods 0.000 claims abstract description 17
- 238000012937 correction Methods 0.000 claims description 8
- 238000013139 quantization Methods 0.000 claims description 3
- 238000012935 Averaging Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000005070 sampling Methods 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
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/028—Means for indicating or recording specially adapted for thermometers arrangements for numerical indication
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Abstract
The invention provides a display device of nonlinear temperature, comprising: the acquisition module is used for acquiring a voltage analog quantity signal of the bipolar junction transistor and calculating the analog quantity into a temperature code stream signal; the compensation module is connected with the acquisition module and used for receiving the code stream signal and calculating the temperature code stream signal into a nonlinear temperature compensation value; the second-order filter is connected with the acquisition module and used for receiving the code stream signal and calculating the temperature code stream signal into temperature data; the clock module is connected with the acquisition module, the compensation module and the second-order filter and is used for sending clock signals to the acquisition module, the compensation module and the second-order filter; and the digital temperature processing module is used for receiving and calculating the temperature data and the nonlinear temperature compensation value and displaying the calculated temperature value, so that the problem of inaccurate measuring result caused by temperature nonlinearity generated by the bipolar junction transistor is solved.
Description
Technical Field
The invention relates to the field of precision temperature measurement, in particular to a nonlinear temperature display device.
Background
The global sensor industry has gained rapid growth in recent years. High-precision temperature sensors have wide requirements in the fields of medical electronics, precision instruments, food safety and the like;
the bipolar junction transistor is the core device of the integrated temperature sensor. In semiconductor manufacturing, the characteristics of the device have a constant temperature coefficient, and the voltage signal generated by the device is also accompanied by a constant temperature nonlinearity. The non-linearity created by the device must be overcome in order to produce an integrated temperature sensor with high accuracy.
In view of this, the present application is presented.
Disclosure of Invention
The invention discloses a nonlinear temperature display device, and aims to solve the problem that the temperature nonlinearity generated by a bipolar junction transistor causes inaccurate measurement results.
The embodiment of the invention provides a display device of nonlinear temperature, comprising:
the acquisition module is used for acquiring a voltage analog quantity signal of the bipolar junction transistor and calculating the analog quantity into a temperature code stream signal;
the compensation module is connected with the acquisition module and used for receiving the code stream signal and calculating the temperature code stream signal into a nonlinear temperature compensation value;
the second-order filter is connected with the acquisition module and used for receiving the code stream signal and calculating the temperature code stream signal into temperature data;
the clock module is connected with the acquisition module, the compensation module and the second-order filter and is used for sending clock signals to the acquisition module, the compensation module and the second-order filter;
and the digital temperature processing module is used for receiving and calculating the temperature data and the nonlinear temperature compensation value and displaying the calculated temperature value.
Preferably, the acquisition module comprises: the temperature signal acquisition device and the modulator are connected with the temperature signal acquisition device;
wherein the temperature signal collector is used for collecting V of the bipolar junction transistorbeVoltage sum DeltaVbeVoltage, and carrying out time discretization processing on the two voltages;
and the modulator carries out digital quantization on the discretization processing result to form a temperature code stream signal.
Preferably, the compensation module comprises: the first-order filter, the lookup table and the accumulator are connected in sequence;
the first-order filter receives a code stream signal of the modulator and generates a plurality of address signals;
the lookup table acquires a plurality of temperature nonlinear values according to the address signal;
the accumulator operates on a plurality of the non-linear values to generate a non-linear temperature compensation value.
Preferably, the first order filter generates the address signal once every first preset clock period.
Preferably, the second order filter generates temperature data every second preset clock period.
Preferably, the first preset clock period is 8 pulse periods, and the second preset clock period is 128 pulse periods.
Preferably, the lookup table includes one-to-one correspondence of temperature values, address information, and non-linear values.
Preferably, the digital temperature processing module is configured to receive and calculate the temperature data and the nonlinear temperature compensation value, and display the calculated temperature value as follows:
acquiring a second temperature parameter corresponding to the temperature data output by the second-order filter;
acquiring a first temperature parameter corresponding to the address signal output by the first-order filter;
and searching a temperature correction point matched with the first temperature parameter and the second temperature parameter, acquiring a nonlinear temperature compensation value according to the temperature correction point, and compensating and displaying the temperature data.
According to the nonlinear temperature display device provided by the invention, the acquisition module is used for acquiring a voltage analog quantity signal of the bipolar junction transistor, the voltage analog quantity signal is calculated into a temperature code stream signal, the second-order filter is used for receiving the code stream signal and generating more accurate temperature data, the compensation module is used for receiving the code stream signal and generating a nonlinear temperature compensation value, the digital temperature processing module is used for receiving the nonlinear temperature compensation value and the temperature data, calculating and displaying an accurate temperature value, and the problem that the measurement result is not accurate enough due to the temperature nonlinearity generated by the bipolar junction transistor is solved.
Drawings
FIG. 1 is a block diagram of a non-linear temperature display device according to an embodiment of the present invention;
fig. 2 is a timing diagram of a display device with nonlinear temperature according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the description of the invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
In the embodiments, the references to "first \ second" are merely to distinguish similar objects and do not represent a specific ordering for the objects, and it is to be understood that "first \ second" may be interchanged with a specific order or sequence, where permitted. It should be understood that "first \ second" distinct objects may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced in sequences other than those illustrated or described herein.
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
The invention discloses a nonlinear temperature display device, and aims to solve the problem that the temperature nonlinearity generated by a bipolar junction transistor causes inaccurate measurement results.
Referring to fig. 1, an embodiment of the present invention provides a display device of nonlinear temperature, including:
the acquisition module 1 is used for acquiring a voltage analog quantity signal of the bipolar junction transistor and calculating the analog quantity into a temperature code stream signal;
in this embodiment, the acquisition module 1 includes: the temperature signal acquisition device 11 and the modulator 12 connected with the temperature signal acquisition device 11;
it should be noted that the temperature signal collector 11 is used for V of a bipolar junction transistorbeVoltage sum DeltaVbeSampling is performed, and the two analog voltage signals are subjected to time discretization processing.
The modulator 12 is configured to perform digital quantization and mathematical calculation on the two analog voltage signals subjected to the time discretization to generate a 1-bit temperature code stream signal that can be processed by the digital filter, where the temperature code stream signal is a digital quantity signal.
The second-order filter 2 is connected with the acquisition module 1 and used for receiving the code stream signal and calculating the temperature code stream signal into temperature data;
in this embodiment, the second-order filter 2 is configured to receive a 1-bit temperature code stream signal, and perform filtering processing on the 1-bit temperature code stream signal to generate more accurate temperature data TM.
The compensation module 3 is connected with the acquisition module 1 and used for receiving the code stream signal and calculating the temperature code stream signal into a nonlinear temperature compensation value;
in this embodiment, the compensation module 3 includes: a first-order filter 31, a lookup table 32, and an accumulator 33 connected in this order;
wherein, the first-order filter 31 receives the code stream signal of the modulator 12 and generates a plurality of address signals;
the lookup table 32 obtains a plurality of temperature non-linear values according to the address signal;
the accumulator 33 operates on a plurality of the non-linear values to generate a non-linear temperature compensation value.
It should be noted that the first-order filter 31 is configured to receive a 1-bit temperature code stream signal, perform filtering processing on the 1-bit temperature code stream signal to generate rough temperature data ADDR, and select a corresponding temperature nonlinear value by using the temperature data ADDR as an address input signal of the lookup table 32, specifically, in this embodiment, in a process of one temperature conversion, the number of clocks required by the second-order filter 2 is several times or several tens of times of that of the first-order filter 31, so that in a process of temperature conversion in sequence, the first-order filter 31 generates a plurality of address input signals to query the lookup table 32 to obtain a plurality of temperature nonlinear values VL, and the accumulator 33 performs accumulation averaging processing on the plurality of temperature nonlinear values VL to generate the temperature data TN.
The clock module 5 is connected with the acquisition module 1, the compensation module 3 and the second-order filter 2 and is used for sending clock signals to the acquisition module 1, the compensation module 3 and the second-order filter 2;
it should be noted that, the clock module 5 is configured to generate the clock signal, the first-order filter 31 may generate an address signal every first predetermined clock cycle, and the second-order filter 2 may generate temperature data every second predetermined clock cycle, where the first predetermined clock cycle may be, but is not limited to, 8 pulse cycles, and the second predetermined clock cycle may be, but is not limited to, 128 pulse cycles.
And the digital temperature processing module 4 is used for receiving and calculating the temperature data and the nonlinear temperature compensation value and displaying the calculated temperature value.
Referring to fig. 2, taking an example that the second-order filter 2 completes one temperature conversion, it needs 128 clock cycles, where BS is a 1-Bit temperature code stream signal output by the modulator 12, and generates a set of temperature data in 128 clock cycles after passing through the second-order filter 2, and BS generates an address signal with 3Bit width to select a value corresponding to the lookup table 32 every 8 clock cycles when passing through the first-order filter 31, so that 16 address signals can be generated in 128 clock cycles, and the accumulator 33 accumulates and averages the values of the lookup table 32 selected 16 times to obtain temperature data TN, which is a number with a symbol; adding the temperature data TM and the temperature data TN to obtain final temperature data; it should be noted that the temperature data TM and the temperature data TN may be binary with symbols, but are not limited thereto.
In this embodiment, the contents of the lookup table 32 are temperature non-linear values, which need to be obtained through TM data; the relationship of temperature, address and non-linear value is one-to-one. As shown in the following table:
the first order filter 31 mapping table is as follows:
the second order filter 2 correspondence table is as follows:
in this embodiment, the digital temperature processing module 4 is configured to receive and calculate the temperature data and the nonlinear temperature compensation value, and display that the calculated temperature value is specifically:
acquiring a second temperature parameter corresponding to the temperature data output by the second-order filter 2;
acquiring a first temperature parameter corresponding to the address signal output by the first-order filter 31;
and searching a temperature correction point matched with the first temperature parameter and the second temperature parameter, acquiring a nonlinear temperature compensation value according to the temperature correction point, and compensating and displaying the temperature data.
Specifically, for example: in an actual test, by observing the output TM of the second-order filter 2, a corresponding value μ 2nd (second temperature parameter) is calculated at a certain temperature T, and by continuously adjusting the external temperature, a temperature TN μ 1 is always found so that μ 2nd (second temperature parameter) is equal to μ 1st (first temperature parameter) is equal to 0.125, at this time, the nonlinear value of the temperature is the data of the address of the corresponding lookup table 32, that is, the nonlinear value of the temperature is obtained in the lookup table 32 through the address information (temperature calibration point) corresponding to the first-order filter 31 μ 1st, and the output of the second-order filter 2 is compensated.
According to the nonlinear temperature display device provided by the invention, the acquisition module 1 is used for acquiring a voltage analog quantity signal of a bipolar junction transistor, the voltage analog quantity signal is calculated into a temperature code stream signal, the second-order filter 2 is used for receiving the code stream signal and generating accurate temperature data, the compensation module 3 is used for receiving the code stream signal and generating a nonlinear temperature compensation value, the digital temperature processing module 4 is used for receiving the nonlinear temperature compensation value and the temperature data, calculating and displaying an accurate temperature value, and the problem that the measurement result is not accurate enough due to the temperature nonlinearity generated by the bipolar junction transistor is solved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A non-linear temperature display device, comprising:
the acquisition module is used for acquiring a voltage analog quantity signal of the bipolar junction transistor and calculating the analog quantity into a temperature code stream signal;
the compensation module is connected with the acquisition module and used for receiving the code stream signal and calculating the temperature code stream signal into a nonlinear temperature compensation value, and the compensation module comprises: the first-order filter, the lookup table and the accumulator are connected in sequence; the first-order filter receives a code stream signal of a modulator of the acquisition module and generates a plurality of address signals; the lookup table acquires a plurality of temperature nonlinear values according to the address signal; the accumulator operates the nonlinear values to generate nonlinear temperature compensation values, wherein the nonlinear temperature compensation values are obtained by accumulating and averaging the nonlinear values by the accumulator;
the second-order filter is connected with the acquisition module and used for receiving the code stream signal and calculating the temperature code stream signal into temperature data, wherein the number of clocks required by the second-order filter is several times or dozens of times of that of the first-order filter;
the clock module is connected with the acquisition module, the compensation module and the second-order filter and is used for sending clock signals to the acquisition module, the compensation module and the second-order filter;
and the digital temperature processing module is used for receiving and calculating the temperature data and the nonlinear temperature compensation value and displaying the calculated temperature value.
2. The non-linear temperature display device of claim 1, wherein the acquisition module comprises: the temperature signal acquisition device and the modulator are connected with the temperature signal acquisition device;
wherein the temperature signal collector is used for collecting V of the bipolar junction transistorbeVoltage and Δ VbeVoltage, and carrying out time discretization processing on the two voltages;
and the modulator carries out digital quantization on the discretization processing result to form a temperature code stream signal.
3. The non-linear temperature display device of claim 2, wherein the first order filter generates the address signal every first predetermined clock period.
4. The non-linear temperature display device of claim 3, wherein the second order filter generates temperature data every second predetermined clock period.
5. The device as claimed in claim 4, wherein the first predetermined clock period is 8 pulse periods, and the second predetermined clock period is 128 pulse periods.
6. The apparatus of claim 2, wherein the lookup table comprises a one-to-one correspondence of temperature values, address information, and non-linear values.
7. The device according to claim 2, wherein the digital temperature processing module is configured to receive and calculate the temperature data and the nonlinear temperature compensation value, and display the calculated temperature value as:
acquiring a second temperature parameter corresponding to the temperature data output by the second-order filter;
acquiring a first temperature parameter corresponding to the address signal output by the first-order filter;
searching a temperature correction point matched with the first temperature parameter and the second temperature parameter, acquiring a nonlinear temperature compensation value according to the temperature correction point, and compensating and displaying the temperature data, wherein the matching of the first temperature parameter and the second temperature parameter is that the first temperature parameter is equal to the second temperature parameter, the nonlinear temperature compensation value is acquired according to the temperature correction point, the temperature data is compensated and displayed, and specifically, the nonlinear temperature value is acquired in the lookup table through address information corresponding to the first-order filter, namely the temperature correction point, and the output of the second-order filter is compensated.
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