Brief Introduction of Thermistor Technology and Its Application

1. Introduction of PTC Thermistor

PTC Thermistor heating elements are modern and even future high-tech products. It is widely used in the light industry, housing, transportation, aerospace, agriculture, medical treatment, environmental protection, mining, civil equipment, etc. Compared with heating elements such as nickel, chromium wire, or far infrared, it has excellent advantages.

1. There are special functions of constant temperature, temperature adjustment, and automatic temperature control. When AC or DC voltage is applied to the PTC element to heat up, the resistivity is very low below the Curie point temperature; once the Curie point temperature is exceeded, the resistivity suddenly increases Large, make the current drop to a stable value, achieve the purpose of automatic temperature control and constant temperature.

2. No burning, safe and reliable

The PTC element does not turn red when it is heated, there is no open flame (resistance wire is red with an open flame), and it is not easy to burn. When the surrounding temperature of the PTC element exceeds the limit, its power will automatically drop to the equilibrium value, and there will be no risk of burning.

3. Power saving

The energy input of the PTC element adopts a proportional type and a current limiting function, which saves electricity compared to the switching energy input of heating elements such as nickel-chromium wire.

4. Long life

The PTC element itself is an oxide, without the disadvantages of high-temperature oxidation of nickel-chromium wire, and without the fragile phenomenon of infrared tubes, and has a long life. And the porous type has a longer life than the non-porous type.

5. Simple structure

The PTC element itself automatically controls the temperature, without the need to add an automatic temperature control circuit device.

6. Wide voltage range

PTC components can be used normally under low voltage (6-36 volts) and high voltage (110-240 volts).

Application of PTC thermistor

Low-voltage PTC components are suitable for all kinds of low-voltage heaters, instrument low-temperature compensation, heaters on automobiles and computer peripherals.

The high-voltage PTC element is suitable for heating the following electrical equipment: electric heat preservation dish, shoe dryer, hot melt glue gun, rice cooker, electric hot shoe, electric mosquito repellent, intravenous heating, portable plastic sealing machine, steam hair comb, steam generator, Humidifiers, hair curlers, video recorders, photocopiers, vending machines, hot air curtains, hand warmers, tea dryers, plumbing heaters, travel clothes dryers, car paint booths, liquefied gas cylinder heaters, showers, Beauty appliance, electric heating table, milk bottle thermostat, electric moxibustion device, electric thermos, electric blanket, etc.

Thermistor application

Ceramic PTC Thermistor in circuit control and sensor applications:

Transistor temperature compensation circuit, temperature measurement, and temperature control circuit, overheat protection circuit, incubator, electric fan, color roll washing, kettle, electric water heater, electric blanket, fluorescent lamp, energy-saving lamp, battery charging, transformer winding, heater, delayer, Compressors, color TVs, color displays, over-current security, liquid level control, electronic ballasts, program-controlled switches, electronic component aging stations.

Application of PTC thermistor in electric heating appliances:

Heater, room heater, dryer (cabinet), tumble dryer, hand dryer, hairdryer, hair curler, steam beauty device, rice cooker, mosquito repellent, hand warmer, shoe dryer, pressure cooker, disinfection cabinet, coal Gasification furnace, electric iron, electric soldering iron, plastic welding gun, sealing machine.

Application of PTC thermistor in an automobile:

Electrical overload protection device, hybrid heater, low-temperature start heater, fuel heater, honeycomb heater, fuel level indicator, engine cooling water temperature detection meter.

Ceramic PTC Thermistor

How to choose PTC thermistor:

Each type of thermistor has parameters such as "pressure resistance", "current resistance", "maintenance current" and "action time". You can choose according to the requirements of the specific circuit and the parameters of the product. The specific method is as follows:

1. First determine the maximum ambient temperature when the protected circuit is working normally, the working current in the circuit, the maximum voltage that the thermistor needs to withstand after the action, and the required action time and other parameters;

2. Choose "chip type", "radial lead type", "axial lead type" or "surface-mount type" according to the characteristics of the protected circuit or product;

3. According to the maximum working voltage, select the product series whose "withstand voltage" level is greater than or equal to the maximum working voltage;

4. According to the maximum ambient temperature and the working current in the circuit, select the product specification with "maintenance current" greater than the working current;

5. Confirm that the action time of the thermistor of this specification is less than the time required by the protection circuit;

6. Check the data provided in the specification to confirm that the size of the thermistor meets the requirements.

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