1．PTCElectric Heater Introduction

PTCyesPositiveTemperatureCoefficientAbbreviation,This means a positive temperature coefficient,Usually refers to semiconductor materials or components with large positive temperature coefficient.PTCIt refers to the positive temperature coefficient thermistor,AbbreviationPTCThermistor.PTCThermistor is a typical semiconductor resistor that is sensitive to ambient temperature.,Exceeding a certain ambient temperature(Curie temperature)hour,Its resistance value increases step by step with the increase of ambient temperature.

2． Functional principle

Ceramic materials are generally used as excellent insulators with high resistance.PTCThermistor is based on barium titanate,Made of other polycrystalline ceramic materials,It has low resistance and semiconductor properties. This is achieved by purposefully doping a material with a higher chemical valence as a lattice element of the crystal: a portion of the barium ions or titanate ions in the lattice are replaced by ions with a higher valence, thereby obtaining a certain number of free electrons that generate conductivity.PTCThermistor effect, which is the reason for the step increase in resistance value,, because the material structure is composed of many small microcrystals, at the interface of the grains,So-called grain boundaries(Grain Boundary)A potential barrier is formed on the surface, preventing electrons from crossing the boundary and entering the adjacent area.,This results in high resistance. This effect is offset at low temperatures: the high dielectric constant and spontaneous polarization at the grain boundaries hinder the formation of potential barriers at low temperatures and allow electrons to flow freely. At high temperatures, the dielectric constant and polarization are greatly reduced, resulting in a significant increase in potential barriers and resistance.,Showing a strongPTCeffect.

PTCThermistor dependence on ambient temperature (R-Tcharacteristic)

Wind speed and power relationship

Generally, in the windless state, the rated voltage is applied for operation.1000The power attenuation rate after hours is used to measure the power attenuation rate. The power attenuation rate should be ≤8％。

3．PTCHeater Features

usePTCHeaters made of ceramic heating elements have the advantages of excellent temperature control and energy-saving characteristics, extremely low thermal inertia, safety without open flames and radiation, and good vibration resistance.PTCThe reason why the heater is energy-saving is that its output power will decrease significantly as the ambient temperature increases. When the air volume remains unchanged, the ambient temperature will rise.PTCThe power has dropped. This feature plays a role in automatic power regulation to a certain extent. On the other hand, it can also be understood that the higher the room temperature,PTCThe greater the output power, the faster the heating.

As the room temperature rises,PTCAs the output power decreases gradually, the heating effect becomes slower.

High power densityPTCOne of the most notable features of the heater.PTCThe heater uses forced convection to heat the room temperature。