Positive Temperature Coefficient (PTC) heating elements are elements of a polycrystalline ceramic material containing barium titanate as the base material. On opposite sides of the ceramic core are made of metal coatings, which are also the electrodes. PTC element, and both electrodes are well-encapsulated heat conductive and electrically insulating coating.
Principle of operation
Due to the special characteristics of the range of CH-resistant, PTC elements are suitable for use in various types of heating in most cases without the need for regulators and temperature limiters.PTC elements are characterized by a very favorable course of the curve resistance versus temperature. The area of work is usually in the low impedance characteristics, which can achieve high heating power. When the temperature rises, the PTC heater resistance increases, so the same power decreases. This creates the effect of self-regulation. Therefore there is no need for external control systems and protection against overheating. PTC heater self-regulation mechanism also operates in relation to changes in voltage, at constant temperature. If the voltage is initially increased PTC heater uses more energy, but, consequently, its temperature rises so quickly stabilizes reaching a maximum heat resistance. Therefore, in contrast to traditional heating elements, PTC heater power is not proportional to the square of voltage. Therefore, you can use the same PTC heating element on both the 24 V and 48 V or 120VAC and 240VAC and get a similar power output.
Thanks to its self-regulating properties, PTC heating element provides metering heating power, so that keeps the operating temperature at a preset level. The size of separate power is directly dependent on the amount of heat discharged from the PTC element.
A PTC heater can therefore be an effective low cost solution because it provides a highly efficient source of heat in a very small package and this can result in using a smaller enclosure than previously used. The heater also provide lower operating costs because the wattage constantly varies from minimum to maximum based on the temperature required. In some cases, bey thermostat is useful, as well as a low cost snap disc style that is preset to control the heater near the required operating point.Range of parametersof PTCheating elementsare verylarge,cause PTC heaters have this self limiting temperature characteristic, they can be operated without the traditional need of thermostatic control. Of course, there are instances where the use of a supplementar
Supply voltage ; 12V -600V
Output power ;50W-2000W
Output Temperature ; 40C -280C
sizes and forms into a square, rectangular, circular or ring shape.
Most of us have already had some experience of PTC style heaters without even knowing it. For example, plug-in air fresheners, curling irons, espresso machines, dishwashers and many styles of heating cables used for de-icing pipes have used this technology for years. PTC style heaters have a virtually unlimited service life, do not generate RFI noise. Typical outdoor applications are ticket dispensers, parking gates, metering boxes, pump houses, crane cabs, control panels, surveillance cameras, liquid crystal displays, traffic light control boxes, transformer enclosures, telecommunication cabins, medical machinery, railway signaling, and many more.