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Temperature detector and use method thereof

A temperature detector and temperature-dependent technology, applied to thermometers, thermometer parts, instruments, etc., can solve problems such as increased design difficulty and reduced operating voltage of electronic components

Active Publication Date: 2011-04-06
NAN YA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the operating voltage of electronic components has been decreasing
For the design of comparators, facing low voltage sources and large-scale input voltage fluctuations will make the overall design more difficult

Method used

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  • Temperature detector and use method thereof
  • Temperature detector and use method thereof
  • Temperature detector and use method thereof

Examples

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Embodiment Construction

[0012] FIG. 2 shows a temperature detector of an embodiment of the present invention. The first comparator 21 is used between 120° C. and 40° C., and its relative input voltage variation is 0.51 volts to 0.67 volts. The second comparator 22 is used between 40°C and -40°C with a relative input voltage variation of 0.67V to 0.82V. The first comparator 21 and the second comparator 22 can perform a comparison approximately every 64 μs, and transmit the comparison result to the controller 28 via the second multiplexer 23 . Since the first comparator 21 and the second comparator 22 are not always in operation, the controller 28 can use the EN signal to activate the first comparator 21 and the second comparator 22 when comparing. There is an initial test value in the controller 28, such as binary 1110000, representing 88°C. At startup, the controller 28 enables the first comparator 21 and disables the second comparator 22 via the SEL_n signal, and the start test value selects the f...

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Abstract

The invention relates to a temperature detector and a use method thereof. The temperature detector of the invention comprises a plurality of comparators, an electronic element and a controller, wherein the comparators are in charge of detecting different temperature zones respectively; the threshold value of the electronic element changes as outside temperature varies, and the output of the electronic element is connected to the comparators; the controller is used for starting one of the comparators within a period of time and generates the other input of the each comparator.

Description

technical field [0001] The present invention relates to a temperature detector and its usage method, in particular to a temperature detector utilizing multiple comparators and its usage method. Background technique [0002] Most electronic products or components are very sensitive to changes in operating temperature. For example, digital cameras will affect their output performance due to the temperature environment they are in; as far as the IC is concerned, temperature changes will also affect the operating point and calculation. speed. Therefore, in order to have a stable performance, most electronic components usually need to be equipped with a temperature detector to detect the external temperature and perform signal compensation. [0003] Figure 1 is a conventional temperature detector. The input of the multiplexer 11 is a plurality of resistor voltage dividers 15, and the voltage dividers can be arranged in descending order. The output Vres of the multiplexer 11 an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K1/00
Inventor 李文明
Owner NAN YA TECH
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