Respecting capacitance, various meetings making a way let person dizziness dazzled, filmy capacitance, capacitance of pottery and porcelain, bring compasses Y electric capacity, high-pressured capacitance is waited a moment, actually capacitance of high-pressured pottery and porcelain also has a variety of calling law, for instance bypass capacitance, go Ou capacitance, filter wave capacitance, store can capacitance is waited a moment, actually anyhow appellation, its principle is same, use the character that presents low impedance to communicating signal namely, this can pass the equivalent impedance formula of capacitance to see: Xcap=1/2 л FC, working frequency is taller, the impedance of capacitance value is greater capacitance is smaller.

 

In circuit, if bring the main effect since compasses capacitance,be the access that provides low impedance to communication signal, call bypass capacitance; If basically be to increase the communication coupling of power source and ground, reduce the communication signal effect to power source, can call go Ou capacitance; If be used in filter wave circuit, can call filter wave capacitance again so; Divide this beyond, to volts d.c. , capacitor of pottery and porcelain still can serve as circuit store can, use the function that batteries goes to since strong discharge. And in actual condition, often the action of capacitance is many sided, we can need not spend too much idea to consider how to be defined.

 

Go the effect that Ou capacitance has a battery namely, satisfy the change of drive circuit electric current, avoid mutual the coupling interference between. Go Ou and bypass can regard filter wave. Go Ou capacitance is equivalent to batteries, avoid to make voltage drops as a result of voltaic mutation, be equivalent to filter ripple. Specific look value is OK the size according to electric current, ripple size of expectation, bulk of effect time will calculate. Go Ou capacitance is general very big, right more high-frequency noise, disable basically.

 

Bypass capacitance is aimed at namely high frequency come, the frequency impedance that used electric capacity namely is characteristic. Capacitance can regard as commonly model of series of a RLC. In a certain frequency, can produce resonance, right now the impedance of capacitance is equal to its ESR. If watch the frequency impedance graph of capacitance, can discover the curve that is form of a V commonly. The medium of specific curve and capacitance is concerned, so choice bypass capacitance considers the medium of capacitance even, a safer method is much and a few capacitance.

 

In electronic circuit, go Ou capacitance and bypass capacitance are the effect that has interference rejection, the position with located capacitance 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. But the capacitance that the high frequency composition in mixing the communication signal that has high frequency electric current and low frequency electricity bypass filter drops, say to do ” of “ bypass capacitance.