The possibility to determine and control the temperature changing with defined accuracy is one of the important tasks which are extremely actual for engineers. Epcos has one of the leading positions in development of sensor control systems with different technological parameters.The operating principle of such components produced on the base of oxides of Zn, Ni, Fe is based on the decreasing of electrical resistance at temperature growth. Particlularly, when measuring devices choosing thermistors with Negative Temperature Coefficient. In order to provide linearization of temperature characteristic and the calculations holding NTC thermistors are often used together with microcontrollers. Для линеаризации температурной характеристики и проведения расчетов NTC термисторы могут быть использованы совместно с микроконтроллерами.
Thanks to high sensitivity, mechanical strength of the case and reliability NTC thermistors are used in:
- Electronic compensation in circuits
- The limitation of inrush current (motors, transformers, fluorescent lamps)
- The providing of motors smooth start operating at constant values of current up to 20A
- Temperature measuring (home appliance, automobile and industrial electronics).
- The temperature measuring in mobile phones, HDD, LCD displays and other devices
The advantages of Epcos NTC thermistors:
- A wide range of working temperatures
- Accuracy. Epcos thermistors can be used for fixing of temperature marks with tolerance ±1°С
- The posiibility of long-distancemonitoring
- High sensitivity
Among main characteristics which one can take into considearation when choosing NTC thermistor:
RT - NTC resistanse at defined temperature, Ohm;
RR - NTC resistance at nominal temperature, Ohm;
α - Resistance tolerance, %
I - maximal , А
W - Maximum power within stated temperature range, W
δth - Dissipation factor, mW/К;
Сth - Heat capacitance, mJ/К;
τc - Thermal cooling time constant , s
Epcos has represented a wide range of NTC-themistors with different geometrical shapes, terminals configurations and resistance values (from 1 до 80 Ohm), which allows to choose the sensor for different applications.
NTC thermistors: main series produced by Epcos
Glass-encapsulated NTC Sensor Elements
Glass-encapsulated NTC Sensor Elements are characterised by compact sizes? high reliability, wide range of resistance (from 2 kOhm to 1.4 MOhm) values. They are mainly applied human appliance devices and some types of industrial equipment and also in automobile electronics. particlularly, thanks to minimal operation time and a wide range of working temperatures (-50...+150°С) such components can be used for monitoring and temperature measuring.
High accuracy and a short response time of thermistors in a glass case allow to use them in,edecine equipment. Epcos has developed the special series of NTC thermistors (B57542, B57552, B57562) used in medical thermometers operating at +25 ... +45°С.
Leaded NTC Thermistors
Epcos Leaded thermistors are represented by a few series of sensors with improved technical characteristics that allows to use them for temperature measurement and compensation in household equipment, heating and conditioning systems, sensors, industrial electroincs.
The series of lealess sensors represent components with front surface silver-plated. Such components were developed by Epcos for temperature measuring insystems of water and oil injection cooling used in automobiles.
|Type||R25, kOhm||Tamb, °С||Drawing||Pmax, mW||τc, s||Detailed information|
Inrush current limiting NTC Thermistors
Thermistors with negative temperature coefficient are characterised by high reliability, in such a case they can be used not only for compenstaion and temperature mesuring but also for inrush current limiting. The application of NTC Thermistors in industrial devices allows to prevent from the blowing of surge-voltage protector providing the load's protection and the decreasing the probability of equipment's breakoff.
SMD NTC Thermistors
At present time among main tasks which face the engineers of LED one can note the increasing of useful life providing low cost and high efficiency. At high temperatures the decreasing of reliability and deformation of the LED case are possible. In order to achieve of predetermined working characteristics of LED systems it is necessary to control temperature of transition avoiding the high border values of working range. The series of SMD thermistors can be used as an integral part of the LED module and can easily be integrated in the assembly process. Small size, good thermal contact to the PCB and negligible self warming make SMD NTC thermistors very sensitive and accurate sensors. If an SMD NTC is integrated into an LED module, any deviation from the optimum operating temperature of the LED will cause a significant resistance change of the NTC. This will change the current flow through the SMD NTC thermistor and hence change the voltage drop across it. This change can be read by the comparator of the LED driver to adjust the LED driving current which will reduce the power dissipation in the LED increasing its’ life-time.
NTC Тhermistors. Probe assemblies
Epcos Probe assemblies represent sensors encapsulated in metallic or plastic case with isolated leads. Such components are characterised by easy mounting. They are universal devices for temperature measuring in air cooling, dish-washing machines, freezing chambers, electrical motors, transformers.
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