Big way, the effect of electrolytic capacitor
can be divided into the following three kinds: 1, in the low frequency amplifier circuit, can have the effect of low frequency signal transmission.
2, in the dc power supply, can also play the role of energy storage, reducing power resistance.
3, in the rectifier circuit, can act as a filter, reduce the dc output voltage ripple.
The principle of the working principle of capacitance, charge and discharge, simply is the polar charge or discharge the capacitor, the spread of the charge.
Charge and discharge capacitance should be serial, parallel, grounding all can;
It is the basis of the capacitance of other properties.
Across the pass-through phenomenon which is the embodiment of the charge and discharge, if it is a direct current (dc), filling out stopped, capacitor charged;
If it is an alternating current, is constantly charging discharge.
Accomplish the transmission of an alternating current.
Every straight into the circuit need to pass ac signal, power filter, used in areas such as the partition of dc.
Capacitance of the charge and discharge is the basis of other properties.
Capacitor is the basic function of charging and discharging, but by the basic charge and discharge function extension of the phenomenon of many circuits, capacitors with a variety of different purposes, such as in an electric motor, we use it to generate the phase shift;
In the camera flash, use it to produce high-energy instantaneous discharge and so on;
In electronic circuit, capacitor different purposes, especially the many different USES, although there are different, but because of its function are from charging and discharging.
There are two kinds of filter, one kind is the power filter, it is obvious to charge and discharge, it can be considered a container.
Another is signal filtering, is an alternating current, is also in the process of alternating current polarity changes constantly line charge and discharge, can through the alternating current (ac), if not capacitor charge change with its two tents, of how alternating current (ac) also can't again.
Anyway, charge and discharge is capacitance, basic properties of the basic role: as one of passive components capacitance, its role is the following: 1, the application in the power circuit, realize the bypass, lotus root, filter and energy storage, give details of the following categories: 1)
Bypass the bypass capacitor energy storage device is provided for the local device energy, it can make the output of the voltage regulator homogenization, reduce the workload requirements.
Like a small rechargeable battery, bypass capacitors can be charged, and to put the electric device.
To minimize the impedance to bypass capacitors, try to close to the load device power supply pin and pin.
It can effectively prevent the input value is too large and cause the earth potential of raises and noise.
Play is ground connection at the voltage drop across the large current burr when.
Go lotus root lotus root, also called decoupled.
From circuit for, always can be divided into driving source and driven load.
If the load capacitance is large, driver circuit to the capacitor charging, discharge, to complete the signal jump, in the rise is steep, the current is large, this will absorb a lot of drive current of the power supply current, because in the circuit inductance, resistance (
Especially the inductance on the chip pins, can produce rebound)
, the current relative to normal, in fact is a kind of noise, affect the normal work of the former level.
This is the coupling.
Decoupled capacitance is play the role of a battery, meet the changes of driving circuit current, avoid mutual coupling interference.
Combine bypass capacitors and decoupled capacitance will be easier to understand.
Bypass capacitors actually also to coupling, just bypass capacitors generally refers to the high frequency bypass, also is to give the switch of high frequency noise increase a low impedance leakage prevention way.
High-frequency bypass capacitors tend to be small, according to the resonance frequency is usually 0.
1 u, 0。
01 u, etc. , and the decoupling capacitor is compared commonly big, uf is 10 or more, according to the distribution parameters in circuit, and the change of the drive current to determine the size.
Bypass is interference of the input signal as object, filtering and decoupling is the interference of output signal as the filter object, to prevent interference signal to return to power.
This should be the essential difference between them.
The assumption capacitance is pure capacitance)
Said, the greater the capacitance, impedance is smaller, by the higher the frequency also.
But in fact most of the more than 1 uf capacitance for electrolytic capacitor
, there is a lot of inductance component, so after high frequency impedance increases.
Sometimes see a larger capacitance electrolytic capacitor in parallel with a small capacitance, then large capacitance at low frequency, small capacitance high frequency.
Lao capacitance effect is low resistance, high frequency resistance at low frequency.
Let the more easily through the low frequency, the greater the capacitance, the greater the high-frequency easier to pass.
Specific use in filtering, large capacitance,
Filter the low frequency, small capacitance (
High frequency filter.
Have net friend compared filter capacitance to & other;
Pond & throughout;
Due to the inability of the ends of the capacitor voltage mutation, therefore, the higher the signal frequency, the greater the attenuation, can say very image of the capacitance is like a pool, not caused by the addition of a few drops of water or the evaporation of water.
It changes the voltage changes into current, the higher the frequency, the greater the peak current, so as to buffer the voltage.
Filtering is charging and discharging process.
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