The technical indicators of DC power supply can be divided into two categories. One is the characteristic indicators, such as the allowable adjustment range of voltage and current, and the other is the quality indicators, used to measure the stability of the output DC voltage, such as voltage stabilization coefficient, output voltage and ripple voltage. Next Xiaobian for you to explain the quality indicators of DC power supply in detail.
 

 

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1, voltage regulation coefficient (voltage regulation rate) : in the case of constant load current and ambient temperature, the relative change of input voltage leads to the change of output voltage. Voltage regulation refers to the relative change of output voltage when the relative change of input voltage is ±10%. Both can show the effect of the input voltage change on the output voltage. Test one of them.

2, the output resistance (current regulation rate) : the output resistance and the output resistance of the amplifier is the same, its value is the absolute value of the output voltage change and the output current change ratio when the input voltage is constant. Current regulation refers to the relative change in output voltage from 0 to the maximum output current. Both of them can represent the effect of load current variation on output voltage. Test one of them.

3, ripple voltage: AC voltage component superimposed on the output voltage. The peak to peak values observed by the oscilloscope are generally millivolts. Ac millivolt meter can also measure its effective value, but its ripple is not a sine wave, so there is a certain error.