(1) Voltage regulation coefficient (voltage regulation rate) SU: Under the condition that the load current and ambient temperature remain unchanged, the relative change of the input voltage (10%) causes the relative change of the output voltage. The smaller the SU value, the better the voltage regulation performance. the better.
(2) Internal resistance (output resistance) rn: When the load current changes, the output voltage of the power supply will also change, and the smaller the change, the better. Internal resistance is used to characterize the power supply's ability to suppress changes in load current. The internal resistance of the power supply is defined as the ratio of the output voltage change of the power supply to the output current change when the input voltage remains unchanged. The smaller the rn, the stronger the suppression ability.
(3) Current regulation rate Sl: The current regulation rate refers to the percentage of the relative change of the output voltage when the load current changes from zero to the maximum when the input voltage is constant. The smaller the Sl, the better the current regulation rate. . The size of the current regulation rate also reflects the size of the internal resistance to a certain extent, they all indicate the ability of the output voltage to remain stable when the load current changes. Therefore, in general, only one of the two is used, and the indicator of internal resistance is used in many occasions.
(4) Ripple coefficient S0: There is a ripple voltage in the output voltage of the power supply, which is the AC component contained in the output voltage. If the ripple voltage is too large, it may cause noise to the audio equipment, and may cause image distortion and rolling interference to the TV. The smaller the S0, the smaller the ripple interference.
(5) Temperature coefficient Sr: The temperature coefficient is used to indicate the stability of the output voltage temperature. Under the condition that the input voltage and output current remain unchanged, the ratio of the drift of the output voltage to the temperature change caused by the change of the ambient temperature is called the temperature coefficient. The smaller it is, the more stable the power supply works [3].
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