PTC thermistor zero-power voltage effect automatic testing system

An automatic test system and voltage effect technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of low precision, high requirements for pulse power switching, and difficulty in voltage regulation.

Inactive Publication Date: 2004-02-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oscilloscope method is complicated to operate and has low precision
The peak detection method has high precision, but has disadvantages such as difficulty in voltage stabilization and high requirements for pulse power switches
[0009] At present, the zero-power voltage effect automatic test system device of positive temperature coefficient thermistor (PTCR) is still blank at home and abroad.

Method used

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  • PTC thermistor zero-power voltage effect automatic testing system
  • PTC thermistor zero-power voltage effect automatic testing system
  • PTC thermistor zero-power voltage effect automatic testing system

Examples

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Embodiment Construction

[0021] Such as image 3 As shown, the system adopts single-bus control technology, serial A / D devices, and is directly connected with the parallel port of the upper PC, realizing the integration of communication and control. Below with example the present invention is described further.

[0022] (1) The AC room power 220V is connected in two ways, and one way is input to the rectifier and voltage regulating module for rectification and voltage regulation, and then divided into three ways to supply power to the system circuit board;

[0023] (2) The other channel is connected to the primary side of the program-controlled transformer 2, and the secondary side windings of the transformer are combined into one, ten, and hundreds-digit voltages according to the 8421 coding rules. After the output of the multi-tap transformer, the output of the variable voltage adopts the combination method of multi-tap. The computer outputs the address code, and controls the switch matrix 3 via t...

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PUM

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Abstract

The present invention discloses a PTC thermistor zero powder voltage effect automatic test system. After having been rectified the output voltage of program-controlled transformer is undergone the process of modulation shaping and formed into A.C half-wave pulse, and voltage-applied to the PTCR; the computer is used for controlling program-controlled transformer, current gain branch and voltage gain branch; the data acquisition module can synchronously sample the above-mentioned two branches in two ways to obtain the sampling values of tested voltage and current; then the sampling values are fed into computer by means of interface module to make data analysis processing; and computer can utilize temp. control device to control. acquire and feed back the temperature in the electric furnaceso as to implement temperature rising and heat-insulation of PTCR.

Description

technical field [0001] The invention belongs to thermistor testing technology, in particular to a PTC thermistor zero-power voltage effect automatic test system, which is suitable for testing the zero-power voltage effect and zero-power volt-ampere characteristics of a positive temperature coefficient thermistor (PTCR) use. Background technique [0002] The voltage effect of PTCR refers to the phenomenon that the grain boundary barrier is tilted under the action of an external electric field. Macroscopically, the material resistivity (generally refers to the measured value above the Curie point) decreases with the increase of the applied voltage. Therefore, the study of the voltage effect is also one of the important contents of the study of the PTC effect. [0003] Under the premise that PTCR implements zero-power test, the measured voltage-current characteristics are called zero-power volt-ampere characteristics. According to this requirement, the zero-power volt-ampere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 周东祥龚树萍董浩斌王华刚黎步银
Owner HUAZHONG UNIV OF SCI & TECH
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