Solution (single or multiple) of the following equation system corresponds to intersection(s) of respective load line and function graph in the above graph. Red load line corresponds to overload state with the lowest load resistance In this state current is RL. limited by high resistance of thermistor. Rated operation corresponding to blue line is automatically after overload ending. Rated operation corresponding to green line automatically resets after overload ending. Using of PTC thermistor for protection from overcurrent resulted from voltage rise At that . When voltage rises from value to value the circuit current drops down RL2=RL1 V0 V01 V02 and corresponds to point E in the below graph. Using of PTC thermistor for temperature protection Position of current-voltage curve of the thermistor after temperature rise is indicated by red line in the below graph. Common applications of PTC thermistors are: Motor start. Self-regulated heaters Fluorescent lamp start. (in thermostats). Degaussing. Resettable fuses. Power semiconductors protection Liquid level sensors. Compact fluorescent lamp circuit Transformer protection Liquid level sensors Power semiconductors protection NTC thermistors are resistors with a high negative temperature coefficient. They are much more commonly used than PTC thermistors. The first NTC thermistor was discovered in 1833 by Michael Faraday, who reported on the semiconducting behavior of silver sulfide. Commercial production of thermistors began only in the 1930s. NTC thermistors are the most sensitive of all the temperature sensing elements and have a rapid response time. Interchangeability with is another important feature. tolerances 0.1…0.2 °C NTC thermistors are hard and rugged sensors. They are able to handle mechanical and thermal shocks better than any other temperature measuring device.
Solution (single or multiple) of the following equation system corresponds to intersection(s) of respective load line and function graph in the above graph. Red load line corresponds to overload state with the lowest load resistance RL. In this state current is limited by high resistance of thermistor. Rated operation corresponding to blue line is automatically after overload ending. Rated operation corresponding to green line automatically resets after overload ending. Using of PTC thermistor for protection from overcurrent resulted from voltage rise At that RL2=RL1 . When voltage V0 rises from value V01 to value V02 the circuit current drops down and corresponds to point E in the below graph. Using of PTC thermistor for temperature protection Position of current-voltage curve of the thermistor after temperature rise is indicated by red line in the below graph. Common applications of PTC thermistors are: Motor start. Fluorescent lamp start. Degaussing. Power semiconductors protection Self-regulated heaters (in thermostats). Resettable fuses. Liquid level sensors. Compact fluorescent lamp circuit Transformer protection Liquid level sensors Power semiconductors protection NTC thermistors are resistors with a high negative temperature coefficient. They are much more commonly used than PTC thermistors. The first NTC thermistor was discovered in 1833 by Michael Faraday, who reported on the semiconducting behavior of silver sulfide. Commercial production of thermistors began only in the 1930s. NTC thermistors are the most sensitive of all the temperature sensing elements and have a rapid response time. Interchangeability with tolerances 0.1…0.2 °C is another important feature. NTC thermistors are hard and rugged sensors. They are able to handle mechanical and thermal shocks better than any other temperature measuring device.