Develop as the technology, MLCC bulk can do more and more come small, achieved 0201, look value also increases ceaselessly, have saved a space, restrain ripple, extend the advantage of life. But the resistor of ESR(equivalent series connection of MLCC) lesser characteristic rose to combat the effect however, because can produce the situation of unusual vibration and antiresonance, need to notice all the more when change accordingly.

 

The ● progress as the technology, the high capacity MLCC that counts 10 ～ 100μF above realizes a product to change, can change with its thereby electroanalysis capacitor. Electroanalysis the life of capacitor is 10 years, but can shorten without any element almost the life of MLCC.

Electroanalysis in ● output capacitor capacitance also is changed to be MLCC ceaselessly

Circuit of ● use imitate change go the circumstance of Ou capacitor is increasing.

 

Of all kinds capacitor uses a note

 

 

The size is large, but can bring about what life shortens because he is calorific easily to electroanalysis capacitor

 

The ESR of capacitor can change according to frequency differs and happening.

 

Express the ESR of the capacitor in some frequency to be R, moire electric current expresses to be I, criterion the electric power of RI2 appears hot loss, make him capacitor calorific thereby.

 

Electroanalysis the characteristic that capacitor has high capacity, but because its ESR is exorbitant, because this moire report conductance is sent,giving out heat is its defect greatly.

 

The value of upper limit of moire electric current with acceptability capacitor is called allow moire electric current. Be like the meeting when moire electric current allowing more than when using to shorten the life of capacitor.

 

 

Note: ESR and moire electric current

 

Ideal capacitor is the element that has electrostatic capacity only, but in reality, its still own the resistor class status that brings because of electrode and inductance part. The resistor composition that cannot mark in circuit graph calls ESR (resistor of equivalent series connection) , inductance composition calls ESL (inductance of equivalent series connection) .

 

 

Although dc electric current is the electric current that flows along a direction with constant tension, but the jackknife in the dc electric current of power source circuit has the part of of all kinds communication such as noise electric current. For example, undertake rectification through using alternating current to business (complete wave commutate) hind the bag in gotten dc electricity contains cycle to use alternating current for business the microwave of 2 times (moire) shape pulsatile electric current. In the meantime, in the DC-DC converter of switch means, volts d.c. jackknife has the pulsatile electricity of switch cycle. These all call moire electric current.

 

 

Aluminium electroanalysises the life of capacitor is 10 years

 

Aluminium electroanalysises the static capacitance of capacitor is big, the price is low, because this is used extensively in electronic equipment, but its have service life, because this needs special attention when use. Aluminium electroanalysises the life of capacitor is controlled for 10 years commonly. Because electrolyte dries up,this is (evaporate) bring about electrostatic capacity to reduce and cause (capacity prediction of a person’s luck in a given year) .

 

Of electrolyte disappear quantity and temperature are concerned, its accord with A Lunni of the ” that be called basically the chemical response rate of ” of Wu Siding law is theoretical. This law expresses, if use temperature to rise 10 ℃ criterion life can turn into 2 minutes original 1, if drop 10 ℃ criterion life can turn into 2 times original, because of this 10 ℃ 2 times law. Accordingly, oneself are brought about to give out heat in moire electric current when undertaking use below bigger condition, life will shorten further.

 

In the meantime, of electrolyte dry up to also can make ESR rises. When volts d.c. and moire report ballast are folded, the peak value that needs to note moire tension does not exceed rated voltage (compression) . Power source circuit use rated voltage to be input voltage 3 times right-and-left capacitor.