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The ceramic element’s characteristics are identified by its temperature coefficient. The resistance goes up as the temperature of the ceramic device rises as a result of a current passing through it.
The circuit’s resistance reaches infinity when a temperature that has been predetermined is near, effectively cutting off heat and current. This predefined control circuit reduces the amount of heat required to bring the unit up to the set temperature by adjusting to the temperature of the air around it.
The circuit’s resistance decreases when the temperature outside is low. As the current increases, the temperature rises until it reaches the set point, at which point the device turns off.
The negative temperature coefficient (NTC) device performs the opposite function. The circuit’s resistance decreases as temperature rises. The resistance wire that can be found in a lot of heaters operates in a different way.
The heat is produced by the wire’s resistance when current flows through it. In the circuit that senses temperature and restricts the flow of current, a separate device controls the current.
A rheostat can sometimes lower the heat and current by increasing or decreasing the circuit’s resistance. The wire’s actual resistance to electrical current remains unchanged.
The Global Ceramic PTC Fuses market accounted for $XX Billion in 2021 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2022 to 2030.
Murata has introduced the PRG series of ceramic PTC Fuses, which were made specifically to provide a resettable fuse function in a wide range of equipment used in industrial automation and automotive manufacturing.
While allowing for acceptable current flows through it, the PRG typically has a flat and low resistance curve. The thermistor element heats up as a result of excessive current, with the value changing logarithmically once a certain temperature point has been reached, which significantly reduces the flow of current.
The thermistor works in this way like a resettable fuse, restoring current flow when the device’s temperature drops.
The PRG series is more stable than polymer-based PTC devices and can operate over a wider voltage and current range. For instance, the resistance characteristic of a polymer PTC thermistor changes each time it operates and is soldered in place.
However, the ceramic-based PRG is more stable and predictable because its resistance does not change as much. The PRG series can be used to protect sensors and controls in automotive applications and for a variety of LED lighting applications.
The additional advantage of providing LED lighting with thermal protection is that no additional LED driver is required to perform this function.
By matching the PRG device’s PTC property to the LED’s thermal derating curve, it can operate in line with the LED, saving money on components and board space.
The PRG can also protect parking sensors, infotainment systems, and ADAS systems from short circuits.The PRG21AR4R7MS5RA, which has a maximum operating voltage of 16VDC, a normal current setting of 205mA, and a trip current setting of 390mA (both measured at 25C), is an example of such a device.
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