.

PTC Thermistor Working Principle

PTC thermistor (Positive Temperature Coefficient Thermistor) is a temperature-sensitive semiconductor resistor. Once it exceeds a certain temperature (Curie temperature), its resistance value increases almost stepwise with the increase of temperature. The temperature change of the positive temperature coefficient thermistor can be obtained by the current flowing through the PTC thermistor, or by the external heat input or the combination of the two.

Ceramic materials are usually used as excellent insulators with high resistance. Ceramic PTC is made of barium titanate and doped with other polycrystalline ceramic materials, which has low resistance and semiconductivity. It is achieved by purposefully doping a material with higher chemical valence as the lattice element of the crystal: a part of barium ions or titanate ions in the crystal lattice is replaced by higher valence ions. Therefore, a certain number of free electrons are obtained.

Then, let's look at the reason for PTC thermistoreffect, in other words, the reason for the step increase in resistance value. The material structure is composed of many small crystallites, and the potential is formed on the grain boundary, which prevents the electrons from crossing the boundary into the adjacent area, thus resulting in high resistance. This effect is offset at low temperatures: the high dielectric constant and spontaneous polarization at the grain boundary hinder the formation of barriers and allow electrons to flow freely at low temperatures. At high temperatures, this effect greatly reduces the dielectric constant and polarization, leading to a substantial increase in the barrier and resistance, showing a strong PTC effect.

PTC is a kind of semiconductor heating ceramic. When the external temperature decreases, the resistance value of PTC decreases, and the calorific value increases correspondingly. PTC thermistor working principleis as follows: once it exceeds a certain temperature (Curie temperature), the resistance increases of positive temperature coefficient resistor with the increase of temperature almost in a step-by-step manner. The temperature change of PTC thermistor types body can be obtained by the current flowing through it, or by the external input heat or the combination of the two. Ceramic materials are usually used as excellent insulators with high resistance, PTC ceramics are based on barium titanate and doped with other polycrystalline ceramic materials, which have low resistance and semiconductivity. It is achieved by purposely doping a kind of material with higher chemical value as the lattice element of the crystal: in the lattice, part of barium ions or titanate ions are replaced by higher valence ions. Therefore, a certain number of free electrons are obtained.

As one of industrial sensor suppliers, we will do our best to meet all the needs of customers.



在线联系供应商

至: Shenzhen Temp-sen sensor Co., LTD
Your E-mail:
消息正文:


Send to other suppliers

Other supplier products

PM1.0 PM2.5 PM10 Laser Particle Dust Sensor Digital Module
PM1.0 PM2.5 PM10 Laser Particle Dust Sensor Digital Module D7 is a kind of digital and universal particle temperature sensor, which can be used to obtain the number of suspended particles in the air,i.e.the...
Coffee Maker Machine Temperature Sensor
Coffee Maker Machine Temperature Sensor Coffee Maker Temperature Sensor Specification: TPS191220-21 Coffee Maker Temperature SensorDetails Coffee Maker Temperature Sensor Material: Th...
Electrochemical Type Formaldehyde gas Module CH2O Detection Air Quality Sensor
Electrochemical Type Formaldehyde gas Module CH2O Detection Air Quality Sensor SC02-CH2O is a general-purpose and miniaturization electrochemical formaldehyde detection module. This gas detector ch2o sensorutilizes electrochem...
Temperature Sensor
Temperature Sensor Different Pellet Grill Inside Temperature Sensor TPS200813-31 TPS24 type Microwave temperature sensorand temperature transduceris a high level...
Infrared Carbon Dioxide CO2 Gas Sensor Module Detection 0-5000ppm
Infrared Carbon Dioxide CO2 Gas Sensor Module Detection 0-5000ppm QC102 NDIR infrared carbon dioxide sensoris a common type, small size sensor, using non-dispersive infrared (NDIR) principle to detect the existenc...
供应产品

Same products

Sealing tile gasket GB97.1-85 Generator QFSN-200-2 China turbine parts
Sealing tile gasket GB97.1-85 Generator QFSN-200-2 China turbine parts 卖方: DONGFANG YOYIK (DEYANG) ENGNIEERING CO; LTD "Sealing tile gasket GB97.1-85 Generator QFSN-200-2 China turbine partsDeyang Dongfang Yoyik is a...
Magnetic Sensor Connector
Magnetic Sensor Connector 卖方: ALIF TECH. CO., LTD. Connector: Housing made of plastic. The ALIF magnetic sensor connector types are put into the ad...
PD Adjustable Sensor Mounting Brackets
PD Adjustable Sensor Mounting Brackets 卖方: ALIF TECH. CO., LTD. Special for DFGE/AG-39 series, PD Adjustable Sensor Mounting Bracketsare fixed to profile cylinde...
PBC Sensor Connector
PBC Sensor Connector 卖方: ALIF TECH. CO., LTD. Special for DFGH/AG-26/AG-27 series, PBC adapter can be fixed on round cylinder. Features of P...
PF Sensor Connector
PF Sensor Connector 卖方: ALIF TECH. CO., LTD. Special for DFGH/AG-26/AG-27 series, PF adapter is matched with magnetic sensor Applicable to FES...