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A degaussing circuit using a PTC thermistor is simple, reliable (for its simplicity), and inexpensive. As heaters, in the automotive industry, to provide cabin heating (in addition to heating provided by a heat pump or the waste heat of an internal combustion engine), or to heat diesel fuel in cold conditions before engine injection.
An NTC thermistor's resistance is low at high temperatures. When the circuit is closed, the thermistor's resistance limits the initial current. After some time, current flow heats the thermistor, and its resistance changes to a lower value, allowing current to flow uninterrupted. It is inherently impossible for 100% of supply voltage to appear ...
An inrush current limiter is a device or devices combination used to limit inrush current. Passive resistive components such as resistors (with power dissipation drawback), or negative temperature coefficient (NTC) thermistors are simple options while the positive one (PTC) is used to limit max current afterward as the circuit has been operating (with cool-down time drawback on both).
Circuit design for a simple electromechanical voltage regulator A voltage stabilizer using electromechanical relays for switching Graph of voltage output on a time scale. In electromechanical regulators, voltage regulation is easily accomplished by coiling the sensing wire to make an electromagnet.
This characteristic made it useful for stabilizing circuits against fluctuations in power-supply voltages. [1] This device is often called a "barretter" because of its similarity to the barretter used for detection of radio signals. A modern successor to the iron–hydrogen resistor is the semiconductor PTC thermistor.
With the PC industry rising from the 1980s in Taiwan, its NTC thermistor is adapted as the inrush current limiter in switched-mode power supply to suppress the inrush current when power supply turns on, and the varistor protects the circuit from damaged by surge current occasionally occurred in the electricity network.
In some applications, this self-regulating characteristic allows PTC heaters to be used without thermostats or overtemperature protection circuits. [1] One very important use of self-regulating heating elements is to assure the heating element will not become so hot as to damage itself or other parts of the heater.
Another type of thermal switch is a PTC (Positive Temperature Coefficient) thermistor; these thermistors have a "cutting off" temperature at which the resistance suddenly rises rapidly, limiting the current through the circuit. When used in conjunction with a thermistor relay, the PTC will switch off an electrical system at a desired temperature.
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