6 pin JST06R-JWPF-VSLE Automotive Connector Waterproof Housing Plug

2.3.4 The role of capacitance

(1) Writing capacitors are energy storage devices that provide energy for local devices. It can uniformly output the voltage regulator and reduce load demand. Just like a small -scale rechargeable battery, bypass capacitors can be charged and discharge to the device. In order to minimize the impedance, bypass capacitors should be as close as possible to the power supply pipe and ground pipe foot of the load device. This can prevent the ground potential and noise from being raised and noisy caused by excessive input value. The potential is the voltage drop when the ground connection is at the time through the large current burrs.

(2) Definement is also called decoupling. In terms of circuit, it can always be distinguished into the source of the driver and the driving load. If the load capacitance is relatively large, the driving circuit must charge and discharge the capacitance to complete the jump of the signal. When the rising edge is steep, the current is relatively large, so that the drive current will absorb a large power current. Due to the inductance in the circuit (especially the inductance on the chip's tube feet), the resistance will rebound. This current is actually a noise compared to normal, which will affect the normal work of the previous stage. This is the so -called "" coupling".

The decoupling capacitance is a "battery" role to meet changes in the current of the drive circuit, avoid coupling interference between each other, and further reduce the high -frequency interference impedance between the power supply and the reference place in the circuit.

Combining bypass capacitors and decoupling capacitors will be easier to understand. The barrier capacitance is actually decoupled, but bypass capacitors generally refer to high -frequency bypass, that is, provide a low impedance leakage path for high -frequency switch noise. High -frequency bypass capacitors are generally relatively small, and 0.1 μF, 0.01 μF, etc. are generally small according to the resonance frequency. The capacity of decoupling capacitors is generally large, which may be 10 μF or larger. According to the circuit's distribution parameters and the changes in the driving current, it is determined. The bypass is to use the interference in the input signal as the filtering object, and the decoupling is to use the interference of the output signal as the filtering object to prevent the interference signal from returning the power supply. This should be their essential difference.

(3) Filter theoretically (that is, assumption of capacitance is pure capacitor), the larger the capacitor, the smaller the impedance, and the higher the frequency of passing. However, in fact, more than 1 μF capacitors are electrolytic capacitors, which have a large inductance ingredient, so the impedance will increase after the frequency is high. Sometimes I see a large electrolytic capacitor with a large electrolytic capacitance in parallel. At this time, the large capacitor filter low frequency and small capacitor filter high frequency. The role of capacitance is to communicate with DC and high frequency blocking and low frequency. The larger the capacitance, the easier it is to pass. Specific in filtering, large capacitors (1000 μF) filter low frequency, small capacitors (20PF) filtering high frequency. Some people have compared the filter capacitance to "ponds". The voltage ends of the capacitor will not change. From this we can see that the higher the signal frequency, the larger the decay. It can be said that the capacitor is like a pond, which will not cause changes in the amount of water due to the addition of a few drops of water or evaporation. It converts the change of voltage into changes in current. The higher the frequency, the larger the peak current, which cushion the voltage. Filter is the process of charging and discharge.

(4) Energy storage and energy storage capacitors collect charge through the rectifier, and transmit the stored energy through the transformer to the output end of the power supply. The voltage rated value is 40 ～ 450V (DC), and aluminum electrolyte capacitors with capacitance value between 220 and 150000 μF are commonly used. According to different power supply requirements, energy storage capacitors sometimes use the form of series, parallel or its combination. For power supply with a power level of more than 10kW, a larger canned spiral terminal capacitor is usually used.

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