• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Apparatus suitable for converting a voltage to a temperature using a thermistor is disclosed. The apparatus of the present invention uses a voltage-temperature cross-reference table and a temperature-increment table to perform a conversion instead of using a conventional one-to-one voltage-temperature table, thereby reducing the required capacity of RAM and ROM, Cost can also be reduced. This device includes the following elements. A thermistor and a division resistor are connected in series, one terminal of the thermistor is grounded, one terminal of the division resistor is connected to a voltage source, the thermistor is arranged at a place where the temperature is measured, Change. The analog-to-digital converter receives the voltage from the thermistor and converts it to a digital output. The first multiplexer decodes the high-bit portion of the digital output to select the corresponding temperature from the voltage-temperature cross-reference table as the approximate temperature. The second multiplexer decodes the high bit portion of the digital output and selects the corresponding temperature increment from the temperature-increment table as the temperature step. The multiplier multiplies the low bit portion of the digital output by the temperature step to obtain a fine temperature. The adder adds the fine temperature to the approximate temperature to output the real temperature.
    公开号:KR19990086938A
    申请号:KR1019980020126
    申请日:1998-05-30
    公开日:1999-12-15
    发明作者:테선 후앙
    申请人:양 딩유안；윈본드 일렉트로닉스 코포레이션；
    IPC主号:
    专利说明:

    A device for converting a voltage to a temperature using a thermistor
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage-to-temperature converter, and more particularly, to a voltage-to-temperature converter using a thermistor.
    In general, thermistors are being used to measure the ambient temperature of electronic devices such as the temperature of a motherboard, a CPU, and a rechargeable battery. In general, the temperature specification of the thermistors is within a range between about -40 ° C and + 120 ° C, and the resistance of the thermistor decreases as the temperature increases. In the application of common electronic devices such as temperature control of refrigerators and the like, a thermistor is used to measure and control the temperature. The thermistor is placed in the electronic device where the temperature should be measured. As the temperature changes, the voltage across the thermistor changes to a corresponding value. After measuring the voltage, the real temperature can be obtained by referring to the voltage (resistance) -temperature characteristic curve of the thermistor.
    The voltage-temperature characteristic curve of the thermistor is one logarithmic curve as shown in Fig. To derive the curve, a number of sampling pairs of voltage and temperature values are required. The voltage-temperature characteristic curve of this thermistor is converted to a voltage-temperature cross-reference table so that the measured voltage from the thermistor can be easily switched to the corresponding temperature. However, conventional voltage-temperature cross-reference tables are performed in a one-to-one manner by storing each voltage value and corresponding temperature values sampled from the voltage-temperature curve in a recording medium such as RAM and ROM. Consequently, the memory capacity is increased and the manufacturing cost is increased.
    It is therefore an object of the present invention to provide an apparatus for converting a voltage to a temperature using a thermistor. The present invention does not use a conventional voltage-temperature characteristic curve for performing voltage-temperature conversion. Therefore, the required capacity and unit cost of the RAM or ROM can be reduced.
    1 is a circuit diagram of a voltage-to-temperature converter according to the present invention,
    2 is a voltage (resistance) -temperature curve of the thermistor.
    [Description of Drawings]
    R 1 : Split resistance R t : Thermistor
    11: analog-digital converter 12: first storage medium
    13: second storage medium 14: first multiplexer
    15: second multiplexer 16: multiplier
    17: bit selector 18: adder
    The present invention accomplishes the above objects by providing a voltage-temperature varying device comprising the following elements.
    The thermistor and split resistor are connected in series. Here, one terminal of the thermistor is grounded, one terminal of the dividing resistor is connected to the power source, the thermistor is disposed where the temperature is to be measured, and the voltage of the thermistor changes in accordance with the change in temperature.
    The analog / digital converter receives the voltage of the thermistor and converts this voltage to digital output.
    The first multiplexer decodes the high bit portion of the digital output and thereby selects the corresponding temperature from the voltage-temperature cross-reference table as the approximate temperature.
    The second multiplexer encodes the high bit portion of the digital output, thereby selecting the corresponding temperature increment from the temperature-increase table as the temperature step. The multiplier scales the low bit portion of the digit output by the temperature step to obtain the fine temperature. The adder adds the fine temperature to the approximate temperature to output the actual temperature.
    The voltage-temperature cross-reference table is set and stored in the first storage medium, and the temperature-increment table is set and stored in the second storage medium.
    In the present invention, the voltage-temperature cross-reference table and the temperature-increment table are used by the interpolation means to form a voltage-temperature characteristic curve, so that the voltage drop across the thermistor can be determined by referring to the formed voltage- Temperature. Moreover, the memory required to store the voltage-temperature cross-reference table and the temperature-increment table is smaller than required to store a conventional voltage-temperature cross-reference table.
    The detailed description set forth below is intended to illustrate the embodiments of the invention and is not to be construed as limiting the invention to the described embodiments, but will be understood with reference to the appended drawings.
    A voltage / temperature conversion apparatus according to the present invention is shown in Fig. In Fig. 1, a divided storage R 1 and a thermistor R t are connected in series and are arranged between a reference voltage source Vref and ground. Generally, this thermistor is placed where the temperature should be measured. As the temperature changes, the voltage V t of the thermistor R t is correspondingly changed. This voltage (V t ) is outputted to the analog-digital converter (11). In this embodiment, an 8-bit analog-to-digital converter is employed, where the 8-bit digital output value of the converter 11 is denoted by AD <7: 0> Refers to the high bit portion of <7: 0>, while AD <3: 0> refers to the low bit portion of digital output AD <7: 0>.
    A method for setting a voltage-temperature cross-reference table and a temperature-increment table according to the present invention is described with reference to FIG. In the voltage-temperature characteristic curve of the thermistor R t , a plurality of node voltages V 0 , V 1 , ..., V 15 are selected to divide the voltage equivalent to the various segments, and the node voltages V 0 , V 1, ~V 15) has the temperature values (T 0, T 1, ~T 15) each corresponding to at equal temperature. The <47> values are each node voltage (0 h, 1 h, 2 h ~ F h) of the (V 15, V 14, V 13 ~ V 0: the digital output AD <7 0> higher bit portion AD of ). Therefore, the temperatures T 0 , T 1 , ..., T 15 are provided as approximate temperatures converted from the high bit portions AD <7: 4>. These 8-bit temperature values (T 0 , T 1 , ..., T 15 ) are stored in the first storage medium 12, thereby forming a voltage-temperature cross-reference table.
    Referring to Figure 2, T 0 - T 1 is the temperature of the segments is further divided into 16 equal parts, the value (d 0) of each part is T 0 - is provided with a temperature increment of the temperature T 1 of the segment. Similarly, each of the other temperature segments of T 1 - T 2, T 2 - T 3, - T 14 - T 15 is also each divided into sixteen equivalent segments and the temperature increments (d 1 , d 2 , ~d 15) is obtained. These 8-bit temperature increments (d 0 , d 1 , d 2 , ~ d 15 ) are stored in the second storage medium 13, thereby forming a temperature-increment table. These temperature increments (d 15 , d 14 , d 13 , ~ d 0 ) correspond to the values of the high bit portions AD <7: 4> (0 h , 1 h , 2 h to F h ) of the digital output.
    As shown in FIG. 1, the high bit portions AD <7: 4> are decoded by the first multiplexer 14 and the approximate temperatures corresponding to the high bit portions AD <7: 4> . On the other hand, the high bit portion AD <7: 4> is decoded by the second multiplexer 15 and the temperature increment corresponding to the high bit portion AD <7: 4> is selected from the temperature- do. The outputs of the first multiplexer 14 and the second multiplexer 15 are MRGH <7: 0> (8-bit) and MINC <4: 0> (5-bit), respectively. For example, when the voltage of the thermistor R t is between V 0 and V 1 , the high bit portion AD <7: 4> of the analog-digital output is 15h. Therefore, the decoding result (approximate temperature) MRGH <7: 0> is T 0 and the corresponding temperature increment (temperature step) MINC <4: 0> is d 0 .
    The multiplier 16 then scales the low bit portion AD <3: 0> of the analog-digital output by the temperature step MINC <4: 0> to obtain a fine temperature MTVAL <8: 0> . For example, if AD <3: 0> is 2h, the micro temperature is MTVAL <8: 0> 2d 0 . In order to meet the requirements of precision, only the high bit portion of the fine temperature MTVAL &lt; 8: 0 &gt; needs to be considered. Thus, the bit selector 17 is used to select the high bit portion of the fine temperature MTVAL <8: 0> according to the specification of precision. In this case, the upper five bits of the fine temperature MTVAL <8: 0> are selected, and therefore the bit selector 17 outputs MTVAL <8: 4>.
    Finally, the adder 18 adds the truncated fine temperature MTVAL <8: 4> to the approximate temperature MRGH <7: 0> and generates the real temperature TRREVAL <7: 0>. In this case, the actual temperature TRUEVAL <7: 0> is equal to T 0 + 2d 0 .
    As described above, the apparatus according to the present invention uses a voltage-temperature cross-reference table and a temperature-increment table to reconstruct a differential voltage-temperature characteristic curve of a thermistor, thereby converting a voltage to a temperature . In this embodiment, sixteen coarse temperature values and sixteen temperature increment values are stored, respectively, to form a voltage-temperature cross-reference table and a temperature-increment table, with precise conversion of 256 levels to only 32 stored values Can be achieved. However, the conventional voltage-temperature cross-reference table needs to store 256 temperature values to achieve the same precision conversion (256 levels). Therefore, the conventional conversion apparatus is required to have a memory capable of storing these values, which is eight times as large as the memory required by the apparatus according to the present invention. In conclusion, the present invention can reduce the capacity of the memory required to store data on the voltage-temperature characteristic curve of the thermistor, and is easy to perform, thus reducing manufacturing cost.
    Although the present invention has been described above by way of preferred embodiments, it is to be understood that the invention is not limited to the above-described embodiments. Meanwhile, the contents disclosed in this specification may restrict various modifications by a person having ordinary skill in the art to which the present invention belongs. Accordingly, the scope of the claims should be broadly construed to limit all such modifications and the like.
    权利要求:
    Claims (10)
    [1" claim-type="Currently amended] An apparatus for converting a voltage to a temperature,
    A thermistor and a dividing resistor connected to each other, one end of the thermistor being grounded, one end of the dividing resistor being connected to the voltage source;
    An analog-to-digital converter for converting the voltage of the thermistor to a digital output;
    A first storage medium for storing a voltage-temperature cross-reference table;
    A second storage medium for storing a temperature-increment table;
    A first multiplexer for decoding a high bit portion of the digital output and selecting a corresponding temperature from the voltage-temperature cross-reference table to a coarse temperature;
    A second multiplexer for decoding a high bit portion of the digital output and selecting a corresponding temperature increment value from the temperature-increment table as a temperature step;
    A multiplier for multiplying a low bit portion of the digital output by the temperature step to obtain a fine temperature; And
    And an adder for adding the fine temperature to the approximate temperature to output a substantial temperature.
    [2" claim-type="Currently amended] The method of claim 1, wherein a plurality of node voltages are selected to divide the voltage-temperature curve of the thermistor into a plurality of voltage segments with equivalent voltage, the node voltages each having corresponding node temperature values, Temperature values are stored in the first storage medium to be provided as the voltage-temperature cross-reference table. &Lt; RTI ID = 0.0 &gt;
    [3" claim-type="Currently amended] 3. The voltage-to-temperature converter of claim 2, wherein the node temperature values and the high bit portion values are made one-to-one.
    [4" claim-type="Currently amended] 3. The method of claim 2, wherein a difference between all two adjacent node temperature values is divided by a specific number to obtain all temperature-increment values for the two node temperature values, Are stored in said second storage medium to be provided in said temperature-increment table. &Lt; RTI ID = 0.0 &gt;
    [5" claim-type="Currently amended] 2. The voltage-to-temperature converter of claim 1, wherein the temperature increment values stored in the temperature-increment table and the values of the high-
    [6" claim-type="Currently amended] 2. The voltage-to-temperature converter of claim 1, further comprising a bit selector that receives the output of the multiplier and outputs a high bit portion of the fine temperature to the adder according to the required precision,
    [7" claim-type="Currently amended] An apparatus for converting a voltage into a temperature, comprising: a thermistor and a dividing resistor, one terminal of the thermistor being grounded, one terminal of the dividing resistor being connected to a voltage source,
    An analog-to-digital converter for converting the voltage of the thermistor to a digital output;
    A first storage medium storing a voltage-temperature cross-reference table;
    A second storage medium storing a temperature-increment table;
    A first multiplexer for decoding the high-bit portion of the digital output to select a corresponding temperature from the voltage-temperature cross-reference table as the approximate temperature;
    A second multiplexer for decoding the high-bit portion of the digital output to select a corresponding temperature increment from the temperature-increment table as a temperature step;
    A multiplier for multiplying a low bit portion of the digital output by the temperature step to obtain a fine temperature; And
    And an adder for adding the fine temperature to the approximate temperature to output a substantial temperature;
    A plurality of node voltages are selected to divide the voltage-temperature curve of the thermistor into a plurality of voltage segments at an equivalent voltage, the node voltages each having corresponding node temperature values, Wherein the voltage-to-temperature conversion device is stored in the first storage medium to be provided as a temperature cross-
    [8" claim-type="Currently amended] 8. The voltage-to-temperature converter of claim 7, wherein the node temperature values and the high bit portion values are made one-to-
    [9" claim-type="Currently amended] 8. The method of claim 7, wherein a difference between all two adjacent node temperature values is divided by a specific number to obtain all temperature-increment values for the two node temperature values, and wherein the temperature- Is stored in the second storage medium to be provided in the temperature-increment table.
    [10" claim-type="Currently amended] 8. The voltage-to-temperature converter of claim 7, wherein the temperature increment values stored in the temperature-increment table and the values of the high bit portion are made one-
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1998-05-30|Application filed by 양 딩유안, 윈본드 일렉트로닉스 코포레이션
    1998-05-30|Priority to KR1019980020126A
    1998-05-30|Priority claimed from KR1019980020126A
    1999-12-15|Publication of KR19990086938A
    2001-11-22|Application granted
    2001-11-22|Publication of KR100297821B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019980020126A|KR100297821B1|1998-05-30|Device that converts voltage using thermistor to temperature|
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