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The main technical indicators of DC power supply

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.03.21
The main technical indicators of DC power supply can be divided into two types: one is characteristic indicators, including allowable input voltage, output voltage, output current, and output voltage adjustment range. Another quality indicator is used to measure the stability of the output DC voltage, including voltage regulation coefficient (or voltage regulation rate), output resistance (or current regulation rate), ripple voltage (surrounding and random drift).


1. Stability coefficient and stability rate

Stability coefficient refers to the relative change in output voltage caused by the relative change in input voltage while the load current and ambient temperature remain constant. The voltage regulation rate refers to the relative change in output voltage when the relative change in input voltage is ± 10%. The voltage regulation coefficient and voltage regulation rate both indicate the impact of input voltage changes on output voltage, so only one of them needs to be tested.

2. Output resistance and current regulation rate

The output resistance is the same as the output resistance of the amplifier, and its value is the absolute value of the ratio of the change in output voltage to the change in output current when the input voltage remains constant. Current regulation rate: When the output current changes from 0 to the maximum value, the relative change in output voltage, output resistance, and current regulation rate all indicate the impact of load current changes on output voltage, so only one of them needs to be tested.

3. Ripple voltage

The AC voltage component is superimposed on the output voltage. The peak to peak value observed by the oscilloscope is usually about millivolts. It is also possible to use an AC millivolt meter to measure its effective value, but sometimes there may be some data errors due to the fact that the ripple is not a sine wave.
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