The internal structure of tiles capacitors, capacitance - Capacitance knowledge

by:Thermistor-Mov     2020-06-21
This article mainly introduced the capacitance and the effect of internal structure, this article word count 1200 words, read the full text to 12 minutes. Capacitance effect 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 discharge to the 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. Ground potential is ground connection is through the large current burr at the time of the voltage drop. 2, decoupling decoupling, also called decoupling. 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, rising along the relatively steep, current is larger, 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 level before, this is the so-called & other; Coupling & throughout; 。 Decoupling capacitor is play a & other; Battery & throughout; Function, meet the changes of driving circuit current, avoid mutual coupling interference. Will combine the bypass capacitor and its decoupling capacitor 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 resonant frequency is generally take 0. 1μF、0. 01 u F, etc. ; And the capacity of the coupling capacitance, generally larger, could be 10 u F or greater, based on the distributed parameter in the 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. 3, filtering (theoretically The assumption capacitance is pure capacitance) Said, the greater the capacitance, impedance is smaller, by the higher the frequency also. But in fact more than 1 u F capacitance mostly for electrolytic capacitors, has a large 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. The greater the capacitance low-frequency easier to pass. Specific use in filtering, large capacitance, 1000μF) Filter the low frequency, small capacitance ( 20 pf) High frequency filter. Have net friend image to compare filter capacitance, & 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. 4, a storage capacitor charge collected through rectifier, and will be stored energy transmitted converter leads to the output of the power supply. Voltage rating for 40 ~ 450 VDC, capacitance between 220 ~ 150000 u F aluminum electrolytic capacitor ( If EPCOS B43504 or B43505) Is more commonly used. According to the requirements of the different power supply, the device is sometimes in the form of series, parallel, or their combination, for more than 10 kw power level of the power supply, usually adopt bulky cylindrical screw terminal condenser. Internal structure of its appearance is made of ceramic, but more than there is only one, it also points the glass condenser, paper and electrolytic capacitors. As ceramic tiles capacitors refers to MLCC, namely multilayer ceramic chip capacitors ( MultilayerCeramicCapacitors) 。 According to the material divided into COG (conventional patch capacitance NPO) Encapsulation of X7R and Y5V, its pin 3 0201040 2060. 0805. 1206121, 0181, 2182, 5222. Multilayer ceramic capacitors ( MLCC) By parallel laminated ceramic material and electrode material. Article/tpdrdzydrd. HTML this paper label: capacitance patch on an article: monolithic capacitor, ceramics capacitors, ceramic capacitors next up: the difference between a ceramics capacitors classification, function and advantages
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