How is the design chosen in the electron a right electric capacity?

Nominal after capacitance adds electrify to carry on one's shoulder or back, look value and error capacitance store namely the ability size of charge. Capacitance error is to show its are actual capacity and nominal the deviation between the capacity, have ± normally 10% , ± 20% , the capacitance ± in be being used in the PI in radio frequency circuit to match 0.

5% , ± 0.

The small error capacitance of 75% . 2.

Rated voltage is rated working voltage is this capacitor can work reliably for a long time in circuit and not by puncture can susceptive is the biggest volts d.c. (call compression) again. The ply of material of the structure of it and capacitor, medium and medium is concerned, generally speaking, identical to structure, medium, the capacitor with equal capacity, its compression cost is higher, volume is larger also. After voltage should bringing to bear on between the two plate in capacitor, the electrolyte between plate is in electric field in, it is neuter dielectric originally, as a result of the action of force of field of dispatches from foreign news agency, inside medium element negative electric charge will produce a few deflection locally in the space (if negative electric charge goes against) of shift of electric field direction, form so called couple extremely child, namely medium interior appeared electric field, destroyed original electrically neutral condition. This kind of phenomenon is called the polarization of electrolyte. Visible, the medium below polarization condition takes negative electric charge, but these charge still suffer medium itself manacle and cannot move freely, the insulation property of medium had be notted destroy, only a few charge is broken away from manacle and form very small leakage current. If extra voltage is strengthened ceaselessly, will make polarization charge is broken away from in great quantities finally manacle, cause leakage current to increase greatly, then the insulation property of medium is destroyed, make two plate weak point are received, lose the action of capacitance completely. This kind of phenomenon calls medium puncture. After medium puncture, capacitor is destroyed. Because the working voltage of this capacitor wants to have certain restriction, cannot increase at will. 3.

The size that capacitance of temperature coefficient capacitor changes along with temperature uses temperature coefficient (inside constant temperature limits, temperature every change 1 ℃ , the opposite change of capacitance is worth) will express, this and resistor are euqally same. 4.

The bulk of leakage of electricity of insulation resistance capacitor is measured with insulation resistance. Yue Xiaoyue of capacitor leakage of electricity is good, namely insulation resistance has been jumped over greatly more. The insulation resistance of general small capacitor is very great, can amount to Europe of hundreds of million or Europe of thousands of million. Electroanalysis the insulation resistance of capacitor is general and lesser. 5.

Loss falls in electric field action, the energy that give out heat inside capacitor unit time and wastes makes the loss of capacitor. Ideal capacitor should not waste energy in circuit, but be in actually, capacitor should waste energy more or less, its energy is used up basically comprise by the loss of dielectric loss and metallic part, normally with loss horn tangent the value expresses. 6.

The frequency character of frequency character capacitor is the electric parameter that points to capacitor normally (if tangent of horn of capacitance, loss is worth,wait) the property that follow electric field frequency and changes. In the capacitor that high frequency come off work makes, because dielectric constant is in high frequency when when comparing low frequency small, accordingly capacitance reduces corresponding ground. Meanwhile, its loss lifts those who follow frequency and increase. When this explicit and high frequency job, the distributinging parameter of capacitor, be like extremely piece resistor, down-lead and extremely piece osculatory resistor, extremely piece oneself inductance, down-lead inductance, will affect the performance of capacitor, as a result of the influence of these elements, make the use frequency of capacitor is restricted. 7.

Medium parameter described the dielectric material category that capacitance introduces, the parameter such as temperature character and error, the limits of different value is corresponding also certain capacitance size. For instance quantity of X7R commonly used Yu Rong is 3300pF~0.

The capacitance of 33uF, this kind of capacitance applies to filter wave, the circumstance such as coupling, dielectric constant is bigger, from 0 ° C when temperature change is 70 ° C when, the change of capacitance capacity estimates the electric capacity that is 150pF~2nF for commonly used Yu Rong of ± 15%;Y5P and Y5V, temperature range is wider, change as temperature, capacitance capacity span is ± 10% or + 22%/-82% . To other encode and the concern with characteristic temperature, everybody can consult watch 4-1. For example, the regular job temperature that the meaning of X5R is this capacitance is - C of ° of 55 ° C~+85, corresponding capacitance allows 15%8 of ± of quantitative change melt into.

Enclose dimension to basically be aimed at stick a style electric capacity, enclose and of resistor like enclosing size. 4, the classification of capacitance also has a lot of kinds according to the classification of different means capacitance, sum up a few kinds below 1 common.

Press material cent, capacitance of mother having the cloud, electroanalysis the different type;2 such as capacitance of capacitance, pottery and porcelain, tantalum capacitance.

Press utility cent, the;3 such as capacitance of wave having filter, bypass capacitance, coupling capacitance, laden capacitance.

According to polarity cent, have without polarity capacitance, have polarity electric capacity. CNC Milling