Application of thermistor

　　The positive temperature coefficient thermistor has a larger resistance value when the temperature is higher, and the negative temperature coefficient thermistor (NTC) has a lower resistance value when the temperature is higher. They both belong to semiconductor devices. When the ambient temperature and current are in the c zone, the heat dissipation power of the thermistor is close to the heat generation power, so it may or may not work. When the ambient temperature is the same, the operating time of the thermistor decreases sharply with the increase of the current. The thermistor has a shorter operating time and a smaller holding current and operating current when the ambient temperature is relatively high.

　　NTC). A typical characteristic of thermistors is that they are sensitive to temperature and exhibit different resistance values at different temperatures. The positive temperature coefficient thermistor (PTC) has a larger resistance value when the temperature is higher, and the negative temperature coefficient thermistor (NTC) has a lower resistance value when the temperature is higher. They are both semiconductor devices.

　　The thermistor will be in an inactive 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 heating power, so it may or may not operate. When the ambient temperature is the same, the operating time of the thermistor is shortened sharply with the increase of the current; when the ambient temperature is relatively high, the thermistor has a shorter operating time and smaller holding current and operating current.

　　SMD Thermistor Application

　　SMD thermistors can also be used as electronic circuit components for instrument circuit temperature compensation and thermocouple cold junction temperature compensation. Using the self-heating characteristics of the NTC thermistor, automatic gain control can be realized to form an RC oscillator amplitude stabilization circuit, a delay circuit and a protection circuit. When the self-heating temperature is much higher than the ambient temperature, the resistance value is also related to the heat dissipation conditions of the environment. Therefore, the characteristics of the thermistor are often used in flow meters, flow meters, gas analyzers, and thermal conductivity analysis to make special detection elements. PTC thermistors are mainly used for overheating protection of electrical equipment, non-contact relays, constant temperature, automatic gain control, motor startup, time delay, automatic degaussing of color TV, fire alarm and temperature compensation.

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