Capacitor of pottery and porcelain is summarized

 

Capacitor of pottery and porcelain calls porcelain interpose capacitor again or alone stone capacitor. Just as its name implies, porcelain interpose capacitor is the capacitor that medium material is pottery and porcelain. According to material of pottery and porcelain different, the capacitor of interpose of high frequency porcelain that this kind of capacitor can divide the capacitor of interpose of low frequency porcelain that is 1 ～ 300 PF for the capacity and capacity to be 300—22 000 PF two kinds. Press configuration classification, can divide again for picture shape capacitor, capacitor tubal account, rectangular capacitor, piece the shape capacitor, capacitor that wear a heart a variety of.

 

The characteristic of capacitor of pottery and porcelain

 

1: Because the medium material of capacitance of pottery and porcelain is medium of pottery and porcelain, heat-resisting performance is so good, not easy ageing.

 

2: Soda acid of ability of capacitance of pottery and porcelain and salt kind corrode, do caustic good.

 

3: The dielectric constant of capacitance of low-pressure pottery and porcelain is big, volume is minor, the size is large.

 

4: Insulation property of capacitance of pottery and porcelain is good, be able to bear or endure high pressure.

 

5: Capacitance of pottery and porcelain does not follow temperature basically, voltage, time change and change.

 

 

Capacitor of pottery and porcelain is classified

 

1, capacitor of semiconductor pottery and porcelain

 

(1) the small miniaturization of capacitor of capacitor of exterior layer pottery and porcelain, namely capacitor is in obtain inside minor volume as far as possible as far as possible large size, this is one of tendency that capacitor develops. To detached capacitor component, the basic approach of small miniaturization has two: ① makes the dielectric constant of medium material rises as far as possible; ② makes the ply of medium layer is decreased as far as possible thin. In material of pottery and porcelain, the dielectric constant of iron report pottery and porcelain is very tall, but when pottery and porcelain of the report that use iron makes capacitor of pottery and porcelain of common iron report, medium of pottery and porcelain is done very hard very thinly. Because the intensity of iron report pottery and porcelain is low,be above all, relatively Bao Shirong easy disintegrate, be hard to undertake be manufacturinged actually operating, next, various constituent defect are caused easily when medium of pottery and porcelain is very thin, manufacturing technology difficulty is very great.

 

2) of the BaTiO3 semiconductor pottery and porcelain with more sufficient development of grain of capacitor of pottery and porcelain of crystal boundary layer apparently, the metallic oxide that Tu Fukuo becomes (for example CuO or Cu2O, MnO2, Bi2O3, Tl2O3) , below proper temperature, at heat treatment having below oxidation condition, the oxide of besmear Fu will be formed with BaTiO3 low in all solution photograph, diffuse quickly along open pore and crystal boundary penetrate interior of pottery and porcelain, one is formed on crystal boundary thin layer of thin solid solution insulation. This kind thin the resistor rate of layer of thin solid solution insulation is very high (can amount to 1012 ～ 1013Ω·cm) , although the grain interior of pottery and porcelain still is semiconductor, but performance of system of whole pottery and porcelain arrives to show dielectric constant to be as high as 2×104 the dielectric medium of 8×104. The capacitor that uses preparation of this kind of porcelain calls capacitor of pottery and porcelain of crystal boundary layer (Boundarg Layer Ceramic Capacitor) , abbreviation BL capacitor.

 

2, capacitor of high-pressured pottery and porcelain

 

The porcelain makings of capacitor of high-pressured pottery and porcelain basically has titanium sick at heart baric radical and titanium acerbity Strontium base two kinds big. Titanium is acerbity material of baric radical pottery and porcelain has interpose report coefficient the good point with better character of compression of tall, communication, but also capacitance change ratio follows medium temperature defect of the demote below elevatory, insulation resistance. The Courier temperature of crystal of titanium acerbity Strontium is – 250 ℃ , construction of calcic titanium mine is fastened for cubic brilliant below normal temperature, it is suitable cable system, phenomenon of nonexistent initiative polarization, in acid of the titanium below tall voltage the interpose report coefficient of material of strontium radical pottery and porcelain changes small, tgδ and capacitance change ratio are small, it is very advantageous that these advantages make its regard high-pressured capacitor as medium.

 

3, multilayer capacitor of pottery and porcelain

 

Multilayer capacitor of pottery and porcelain is a the application in chip component is the widest kind, it is will inside electrode material and base substrate of pottery and porcelain with multilayer and alternant shunt-wound superposition, and in all firing a whole, weigh a type again alone stone capacitor, have the characteristic of small size, high specific volume, high accuracy, can stick outfit at printed circuit board (PCB) , mixture integrated circuit (HIC) base piece, product of effectively terminal of contractible electron information (especially portable product) bulk and weight, raise product reliability. Complied with IT industry to be quantified miniaturization, gently, high-powered, muti_function development direction, the country was made clear in compendium of distant view target 2010 put forward to stick the surface install yuan of parts of an apparatus to wait new-style yuan of development key that parts of an apparatus regards an electron as industry. It is good that it encloses simple, sealing not only, and electrode of effectively segregation opposite sex. MLCC can remove memory charge, block to break wave of dc, filter, disaster to close in electronic circuitry, divisional and different frequency and make the action such as circuit tuning. Mix in power source of high frequency switch, computer network power source can replace partly in mobile equipment organic film capacitor and electroanalysis capacitor, improve the filter wave function of power source of high frequency switch and interference rejection performance greatly.

 

 

The action of capacitor of pottery and porcelain

 

Bypass (go Ou)

 

This is the access that provides low impedance for the component of certain paralell connection in alternating current road. In electronic circuit, go Ou capacitance and bypass capacitance are the effect that has interference rejection, the position with located capacitor is different, name is different. To same for circuit, bypass (Bypass) capacitance is a high frequency noise in inputting signal divide a target as filter, before the filter of high frequency clutter that class carries is divided, and go Ou (Decoupling) capacitance also says to retreat Ou capacitance, the interference that is an output signal divides a target as filter. We often can see, between power source and ground connective goes Ou capacitance, it has the effect of 3 respects: It is the harbour that serves as this integrated circuit can capacitance; 2 it is the high frequency noise that filter produces except this parts of an apparatus, cut off its to have the access of transmission through power supply loop; 3 it is to prevent the noise that power source carries to constitute interference to circuit.

 

Coupling

 

The electric capacity of pottery and porcelain that is used in coupling circuit calls coupling capacitance, use circuit of this kind of capacitance in great quantities in amplifier of block look coupling and circuit of other capacitance coupling, function of straight current communication is separated since, it regards two circuit as the join between, allow to communicate signal to pass and transmit circuit of below one class.

 

Filter wave

 

The capacitor of pottery and porcelain that is used in filter wave circuit calls filter wave capacitance, filter wave capacitance is meeting general certain frequency paragraph the signal inside from the purify in total signal, it is so in power source circuit, rectification circuit turns communication into pulsatile dc, and one is received after rectification circuit relatively the capacitance of pottery and porcelain of high capacity, use its to fill discharge character, make the pulsatile volts d.c. after rectification becomes the volts d.c. that stabilizes quite relatively.

 

Syntonic

 

Use in LC syntonic circuit to install compasses capacitor mediumly to call syntonic capacitance, LC paralell connection and series connection need circuit of this kind of capacitance in syntonic circuit.

 

Temperature compensation

 

Be affected to what the adaptability of temperature brings not quite in the light of other component and undertake compensating, improve the stability of circuit.

 

Harmonious

 

It is harmonious to having a system with the circuit related frequency, for instance mobile phone, radio, television.

 

Store can

 

Store can store namely electric energy, use at necessary when release. For example camera flashlight, heating installation is waited a moment. (show very much nowadays electric capacity store can the level that the level can have approached lithium battery, the time that the electric energy that a capacitance stores can offer a mobile phone to use one day)