Thermistor.Wide-Angle Fresnel Lens price

　　The thermistor will be in an unwanted state for a long time; when the ambient temperature and current are in Zone C, the heat dissipation power of the thermistor is close to the thermal power, so the action may not move. When the thermistor is the same as the ambient temperature, the action time is shortened with the current increase; when the thermistor has a shorter action time and the smaller maintenance current and action current when the ambient temperature is relatively high.

　　1. The PTC effect is a material with PTC (POSITIVE TEMPARATURATURATURATURATURATUFICIENT) effect, that is, the positive temperature coefficient effect, which means that the resistance of this material will increase with the increase in temperature. For example, most metal materials have the PTC effect. In these materials, the PTC effect is manifested as the resistance increases with the temperature increase and the linear increases. This is the linear PTC effect that is usually referred to.

　　2. The non -linear PTC effect passes through phase -changing materials will show the dramatic phenomenon of several to a dozen quantities within the narrow temperature range of the resistance, that is, the non -linear PTC effect. Effect, such as polymer PTC thermistor. These conductive polymers are very useful for manufacturing over -current protection devices.

　　3. Polymer PTC thermal resistance is used for overcurrent protection. High molecular PTC thermal resistance is often referred to as a self -recovery fuse (hereinafter referred to as thermistor). Because it has a unique positive temperature coefficient resistance characteristics, it is extremely extremely extremely extremely extremely extremely extremely resistant to the characteristics Suitable for overcurrent protection devices. The use of thermal resistance, like a normal fuse, uses series in the circuit to use

　　When the circuit is working normally, the thermistor temperature is similar to the room temperature and the resistance is small, and the connecting the circuit will not hinder the passing of the current; when the circuit occurs due to the failure, the thermistor is increased due to the increase in thermal power. When the temperature exceeds the switch temperature (TS, see Figure 1), the resistance will increase in an instant, and the current in the circuit will quickly decrease to the safe value. Severe diagrams of changes in current during the protection of thermal resistance on the protection of AC circuits. After thermal resistance action, the current in the circuit has greatly reduced the current. In the figure, T is the action time of thermal resistance. Due to the good designability of the thermistor of the polymer PTC, it can regulate its sensitivity to temperature by changing its own switch temperature (TS), so it can also play two types of effects: KT16 at the same time, such as KT16 -1700DL Specification Thermal resistance is suitable for overcurrent and overcurrent protection of lithium ion batteries and nickel -metalized batteries. The impact of the environmental temperature on the heating resistance of the polymer PTC PTC is a direct thermal, step jump thermistor, and its resistance change process is related to its own heating and heat dissipation. Therefore, its maintenance current (IHOLD ), Action current (itRip) and action time are affected by ambient temperature. When the ambient temperature and current are in area A, the thermal resistance heat thermal power is greater than the heat dissipation power and moves; when the ambient temperature and current are in the B area B, the thermal power is less than the heat dissipation power. Repeat multiple times. Figure 6 shows a schematic diagram of the resistance during the recovery process after recovery. The resistance is generally restored to a level of about 1.6 times in the initial value in more than ten seconds to tens of seconds. At this time, the maintenance current of thermal resistance has been restored to the rated value, which can be used again. The recovery of heat -sensitive resistance with less area and thickness is relatively fast; the recovery of the heat -sensitive resistance with large area and thickness is relatively slow.

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