In current market, there is an active demand for high stability, high precision and high heat-resistance NTC thermistor, such as thermistor for measuring exhaust gas for automobile. The working temperature is 400-500°C. For liquefied petroleum gas temperature measurement, the temperature is rather high too. Therefore, the need for high temp. thermistor is very urgent. Mn-Co-No series thermistor temperature is about 300°C. In order to increase the working temperature, there are some experiments for high temp. thermistor by addingZrO2, Cr2O3 and Al2O3.(more)
TEC is the abbreviation of thermoelectric cooler, which is a kind of heat pumps. In the international arena, a certain effect has been achieved, in the aspects of improving electric piles manufacturing technologies, by using electric insulation heat conducting layer with metal enamel, copper cuprous oxide electric insulation heat conducting layer, compression electric pile structure and themeasures of deflector surface gold plating. However, with the miniaturization of electric piles, the manufacturing process is still the primary factor of pile performance except for element materials. (more)
In recent years, with the development of thermal electric materials and the marketization of TEC modules, there is a R&D upsurge of thermoelectric cooler and thermoelectric conversion devices. Traditional air conditioner and refrigerators apply freon or other compound refrigerant to realize refrigeration. The leakage of freon or other refrigerant lead to pollution of ambient environment and damage to the ozonosphere. Thermo electric cooling technology doesn't need any refrigerant. When it's working, it has high stability, without any noise. Therefore, TEC technology has a wide prospective of development.(more)
Checking the resistance value of elements
The slant element end can result in forming a large contact resistance, and elements with internal defects can lead their resistance value to change. Before brazing, the resistance value of elements should be measured by using contact electrode. If there are abnormal components in the element, it will be removed so as to reduce the contact resistance. It can not only improve the consistency of component performance parameters but also the consistency of electric pile performance. During measuring, the shape of electrode is the same as the substrate and the clamping force is the same as when brazing.(more)
With the shrinking volume of electronic component and the development of its performance and speed, the energy consumption of chips is larger and larger. The excessive temperature will make the component subjected to excessive thermal expansion stress, which can result in its structure damage or even the component burning out. Due to the uneven distribution of the chip power density, local hot spots will be generated. According to statistics, more than 55% of electronic equipment failure is due to excessive temperature. Take space telescope for instance. If the operation temperature of CCD and other electronic components is reduced, it can contribute to reduce dark noise, improve sensitivity and ensure detection ability. Therefore, it is necessary for components with thermal consumption as well as the whole system to use appropriate cooling techniques, which can control temperature and can ensure the normal operation of electronic equipment or system.(more)
When thermoelectric module is in the cooling mode, the heat of cooled device transfers into the cold end of TEC and then based on thermoelectric effect, the heat is dissipated by the heat sink. According to the first law of thermodynamics, the cooling capacity is equal to the Peltire effect with heat conduction from the heat flow analysis of the single couple of TEC cold end:(more)
ATW3A314D Peltier controller is an electronic module, which is being under development. It is designed by Analog Technologies, Inc. (ATI) to set and monitor temperature. This Peltier controller features high efficiency (more than 90%), high reliability, high stability and compact size. The range of programmable maximum output current of ATW3A314D Peltier controller is from 0 to 3A and the range of its programmable maximum output voltage is from 0 to VPS.(more)
NTC thermistor can be used as an electronic circuit component in instrument circuit temperature compensation and thermocouple cold end temperature compensation. When using the self-heating characteristics of NTC thermistor to realize automatic gain control, it can form a RC oscillator, which is used to delay and protect circuit.(more)
NTC thermistor can be used as an electronic circuit component in instrument circuit temperature compensation and thermocouple cold end temperature compensation. When using the self-heating characteristics of NTC thermistor to realize automatic gain control, it can form a RC oscillator, which is used to delay and protect circuit.(more)
TEC is the abbreviation of thermal electric cooler, which is utilized to cool and heat objects based on Peltier effect. In temperature regulation, TEC has many advantages of high stability, high reliability, no noise, and a simple structure with no moving parts. TEC has been widely used for controlling the temperature of laser system, air conditioner, water heater and computer CPU. However, it still has some shortcomings: low efficiency, low thermal power and high cost.(more)
