The technical indexes of DC regulated power supply can be divided into two categories. One is the characteristic indexes, which reflect the inherent characteristics of DC regulated power supply; the other is the quality indexes, which reflect the advantages and disadvantages of DC regulated power supply, including the stability and the influence of noise on the power supply when the equivalent internal resistance current changes. For example, the power noise has a great impact on the quality of communication, the interference of alternating current sound in the call, hindering the clarity of the long-distance call, and then, the black cross line on the image of the buzz in the amplifier and TV, and the image is not straight, which directly affects the user experience.

 

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Effect of output overvoltage. If the output voltage of the DC regulated power supply exceeds 30% of the rated voltage of the IC, the IC may be seriously damaged.

The impact of a brief power outage. For example, the local telephone communication cannot be cut off instantly, otherwise the communication is interrupted, causing a major event; For example, the computer in the use of AC power supply, should use AC uninterrupted power supply.

Ripple is a phenomenon caused by the voltage fluctuation of DC regulated power supply, because DC regulated power supply is generally formed by the rectification of AC power supply, which inevitably communicates with some components under the condition of the amount of DC regulated voltage. Such AC components superimposed on the amount of DC regulated voltage are called ripple. The composition of ripple is relatively complex, and its form is generally higher than the frequency of harmonics similar to sine wave, the other is a very narrow width pulse wave. For different occasions, the requirements for corrugations are also different. For capacitors, no matter what kind of ripple, as long as it is not too large, generally will not affect the quality of the capacitor.