久操91 I 色妞精品av一区二区三区 I 一本色道久久综合亚洲精品按摩 I 未满十八18禁止免费网站 I 国产精品久久久久久在线观看 I 成人午夜视频在线播放 I 亚洲成人看片 I www.四虎在线 I 宅男噜噜噜66网站在线观看 I 巨乳在线播放 I 婷婷91 I 国产成人av网 I 日本又黄又硬又爽的大片 I 国产中文一区 I 伊人影院亚洲 I 国产成人精品午夜2022 I av边做边流奶水无码免费 I 欧美熟妇与小伙性欧美交 I 久久不见久久见www免费视频 I 亚洲国产中文曰韩丝袜 I 奇米视频888战线精品播放 I 欧美性猛交乱大交xxxxx I 久久综合色之久久综合 I 免费国产午夜高清在线视频 I 国产亚洲国际精品福利 I 国产黄色在线 I 欧美日韩国产图片区一区 I 亚洲国产成人精品女人久久久 I 成人无码h动漫在线网站免费 I 国产91美女视频

Thermal sensitivity resistanceIt is a special type of resistive component and the most commonly used type of sensitive component. For different environments such as temperature detection, overheating detection, circuit protection, suppression of inrush currents, and heating, users choose products with different specifications and installation types.

   

For temperature detection and temperature compensation applications, NTC thermistors are preferred, that is, Negative temperature coefficient thermistors. NTC thermistors are electronic components that decrease in resistance value as temperature increases. Their specific packaging types include soft lead, resin packaging, high reliability, and conductive adhesive compatibility, and are used in various products.

 

For applications such as overheat detection, circuit protection, suppression of inrush currents, and heating, positive temperature coefficient thermistors (PTCs) are generally used. Because PTC thermistors maintain a constant resistance value at room temperature, once a certain temperature is exceeded, the resistance value will sharply increase. PTC thermistor is obtained by adding trace rare earth elements to Barium titanate. The ceramic electrode with Barium titanate as the main component is widely used for its lead type and sheet type products.

 

Here are some commonly used technical terms for thermistors.

Before reaching a certain temperature, the resistance value is constant, and once it exceeds this temperature, the resistance value will also rise sharply. The change point of this resistance value is called "Curie temperature (also called Curie temperature)", which is specifically defined as the temperature at which the resistance value is twice the resistance value at 25 ℃.

It is caused by temperature changes that cause errors in instruments, measuring devices, etc., and is specially designed to compensate for auxiliary devices and electrical circuits. For components that change their characteristics due to temperature changes, they can work by suppressing temperature changes.

 

When starting the switching power supply of electronic devices, a large current exceeding the rated current value is flowing.

 

Using the resistance value at the specified ambient temperature of 2 points, calculate the constant representing the change in resistance according to the following formula.

B=ln (R/R0)/(1/T-1/T0)

R: Resistance value at ambient temperature T (K)

R0: Resistance value at ambient temperature T0 (K)

 

It refers to the extremely high voltage that can be applied to a thermistor within the working temperature range.

 

The voltage that can withstand even three minutes of application in still air at 25 ℃ is considered voltage resistance. The voltage is applied by slowly increasing from 0V to withstand voltage.

 

It refers to the amount of heat lost per unit time when the temperature difference between the heating element and the surrounding temperature is 1 ℃.

W=I? V=D (T-T0)

Among them, T is the temperature of the heating element, T0 is the surrounding temperature, and D is the thermal divergence coefficient (W/° C), which is usually determined by the size, structure, and material of the heating element itself.

 

When the ambient temperature moves from T0 Teleportation to T1, 0.632 times the temperature difference is the time. It is generally expressed by heat dissipation coefficient (W/℃) and Heat capacity H (W? Sec/℃) γ＝ H/D.

 

The working point where there is a balance between self heating and external heating.

 

According to the characteristics of current and voltage, the maximum point of current is called current protection.

 

The current protection changes with the surrounding temperature, resistance value, temperature characteristics, shape, etc. The current field that exceeds the upper limit of current protection is the working field, the current field below the lower limit is the non working current field, and the current field between the upper and lower limits is called the current protection variation range.

 

The working time is the time required to reduce the inrush current flowing through the thermistor to half.