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Method for digital control measuring temperature of water heater and apparatus therefor

A technology of digital control and temperature measurement device, which is applied to measurement devices, fluid heaters, electric devices, etc., can solve the problems of market sales restrictions and high prices, and achieve high qualification rate and stability, low price, and simple software. Effect

Inactive Publication Date: 2004-06-02
厦门金明达科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These devices are limited in market sales due to the need to use a higher-priced single-chip microprocessor with an A / D converter.

Method used

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  • Method for digital control measuring temperature of water heater and apparatus therefor
  • Method for digital control measuring temperature of water heater and apparatus therefor
  • Method for digital control measuring temperature of water heater and apparatus therefor

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Embodiment Construction

[0017] For the circuit structure of the digital control water heater temperature measuring device in a preferred embodiment of the present invention, please refer to figure 1 . Two NAND gates U2A of the double NAND gate (4011) chip U2 and the input ends of each NAND gate of the NAND gate U2B are connected in parallel to form two NOT gates. These two NOT gates are connected in series, where the input terminals 1 and 2 of the first NOT gate U2A are connected to one end of the first resistor R12; the other end of the first resistor R12 is connected to the thermistor RT and the oscillation capacitor C3 as the oscillation resistor Node B is formed; the other end of the thermistor RT is connected in series with a variable resistor R11, and then connected to node A at pins 3, 5, and 6 of two non-gates U2A and U2B in series; the output terminal of the second non-gate U2B is pin 4 Connect the other end of the oscillation capacitor C3 to the input node C of the driving amplifier. The ...

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Abstract

The present invention relates to temperature measuring method and device, and is especially temperature measuring method and device with thermistor set in special circuit. The temperature information the thermistor senses is converted into digital temperature data in a microprocessor. The present invention features the thermistor connected serially in an RC multivibrator, the RC multivibrator with output connected to one of the interruption interface of microprocessor; the microprocessor counting the output pulses of the RC multivibrator under the timing interruption to obtain digital frequency data; and the table look-up process of the microprocessor to convert the digital frequency data into digital temperature data for corresponding control. The temperature measuring device is one RC multivibrator comprising two NOT gates, one resistor, one thermistor, one capacitor and one drive amplifier, and has low cost.

Description

Technical field [0001] The invention relates to a temperature measuring method and a temperature measuring device, in particular to a method and a temperature measuring device for measuring temperature by placing a thermistor in a specially used circuit. Background technique [0002] Low-cost single-chip microprocessor control equipment used in places where the temperature change process is slow such as digitally controlled water heaters. The existing temperature measuring device uses a thermistor as a sensor, and the analog voltage output by it is passed by the A / The D converter converts it into a digital quantity, and the single-chip microprocessor controls the water heater accordingly according to the corresponding relationship between the digital quantity and the temperature. These devices are limited in market sales due to the need to use a higher-priced single-chip microprocessor with an A / D converter and a higher price. Contents of the invention [0003] The prese...

Claims

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Application Information

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IPC IPC(8): F24H9/20G01K7/16
Inventor 吴小明
Owner 厦门金明达科技发展有限公司
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