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High-precision temperature collecting circuit based on NTC temperature sensors and method

A temperature sensor and acquisition circuit technology, applied in thermometers, electrical devices, electronic circuit testing, etc., can solve the problems of poor temperature adaptability and low temperature accuracy, and achieve low cost, low circuit complexity, and improved temperature measurement accuracy. Effect

Active Publication Date: 2015-04-22
HUIZHOU EPOWER ELECTRONICS
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is: for the existing temperature acquisition circuit based on NTC temperature sensor, the temperature accuracy of its measurement is low and the temperature adaptability is poor, to propose a circuit for improving the temperature acquisition accuracy

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Embodiment Construction

[0037] The specific implementation manners of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0038] Such as figure 1 As shown, the high-precision temperature acquisition circuit based on the NTC temperature sensor of the present invention includes standard resistance arrays R1, R2, R3, the first switch array S1, the NTC temperature sensor array Rt1, Rt2, ... Rtn, the second switch array S2, Voltage regulator LDO, AD converter, controller MCU and external interface.

[0039] The NTC temperature sensor arrays Rt1, Rt2, ... Rtn are used to collect the temperature of the surrounding environment. Usually, the resistance value of the NTC temperature sensor at a temperature of 25°C is taken as the nominal resistance value. For an NTC temperature sensor with a nominal resistance value of 10KΩ, the resistance magnitude of different standard resistances is controlled at 10 times; For a 100KΩ NTC temperature s...

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Abstract

The invention provides a high-precision temperature collecting circuit based on NTC temperature sensors and a method. The circuit comprises an NTC temperature sensor array, a voltage stabilization source, an AD converter, a controller, an external interface, a standard resistor array, a first switch array and a second switch array, and the first switch array and the second switch array are communicated with one standard resistor in the standard resistor array and one NTC temperature sensor in the NTC temperature sensor array respectively. The AD converter is used for collecting voltage dividing signals between the communicated standard resistor and the communicated NTC temperature sensor and carrying out analog-digital conversion. The controller is used for providing switch selecting signals and calculating the temperature values of the NTC temperature sensors. The external interface is used for providing collected data for external equipment. The circuit can obtain good precision within a wide collecting temperature range, and is low in development cost and easy to implement.

Description

technical field [0001] The invention relates to a temperature acquisition circuit, in particular to a high-precision temperature acquisition circuit based on an NTC temperature sensor. Background technique [0002] At present, NTC (negative temperature coefficient) temperature sensors are more and more widely used, and NTC temperature sensors are used in components such as motors and power batteries in new energy vehicles. At present, the temperature range that often needs to be measured is generally concentrated in the range of -20 to 65°C, and the temperature accuracy of the measurement is within the range of ±2°C. The measurement circuits used generally include the resistance voltage divider method and the constant current source excitation method. However, the above Both methods have the following drawbacks: [0003] 1. The constant current source circuit is relatively complex, and the temperature adaptability of the detection circuit is poor, so it is difficult to meet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/16G01R31/28
Inventor 刘飞文锋阮旭松张维戈盛大双
Owner HUIZHOU EPOWER ELECTRONICS
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