(1) Protection componentsFor example, a polymer positive temperature coefficient thermistor (PPTC) is a conductive polymer formed by using a special polymer mixed conductive particle. Under normal ambient temperature, the conductive particles inside the material contain a low-impedance structure, an

1.Discharge self-healingSuppose there is a defect in the film between the two metallized electrodes and the resistance is R. Depending on the nature of the defect, it may be a metallic defect or a semiconductor or inferior insulation defect. When the defect is a metallic defect, the capacitor has se

1. Film capacitor safetyThe film capacitor uses a certain proportion of oil wax or sulphur hexafluoride as the impregnating agent, and the impregnating agent is poured into the capacitor shell by vacuum impregnation, which can effectively eliminate the partial discharge phenomenon at the edge of the

Due to the variety and type of thermistor, whether you choose PTC positive temperature coefficient thermistor or NTC negative temperature coefficient thermistor, you should choose the model you need according to the circuit.(1) Positive temperature coefficient Thermistor (PTC) is generally used for

1. The performance of varistor(1) The varistor is a non-linear resistance element mainly composed of zinc oxide. The surge current tolerance and nonlinear coefficient of the device are very large. When the threshold voltage is lower than the threshold voltage, the resistance is very high, and almost

Capacitor capacitance(1) "Capacitor", which is an abbreviation of a capacitor, is a "charged container" and is a device that holds a charge. Any two conductors (including wires) that are insulated from each other and are closely spaced together form a capacitor. It is widely used in blocking, coupli

1. Insulation resistance of film capacitorThe insulation resistance of a film capacitor refers to the ratio of the voltage applied across the capacitor to the leakage current, that is, R = U / IL. R is the insulation resistance, U is the voltage, and IL is the leakage current of the film capacitor.

1.Metal thermistor materialSuch materials have a wide range of applications as thermal resistance thermostats, current limiters, and automatic constant temperature heating elements. Such as platinum resistance thermometer, nickel resistance thermometer, copper resistance thermometer and so on. Among

1. Test method of varistor:(1) First need to know the voltage value of the varistor, you can use a suitable voltage source (the voltage source here can be a common power supply; the protection resistor can avoid excessive current, damage varistor or power supply) in series with a protection The resi

Dielectric strength refers to the ability of a capacitor to withstand a dielectric. It is defined as the large voltage that a unit thickness is subjected to when the sample is broken down, expressed as volts per unit thickness. The greater the dielectric strength of a substance, the better its quali