1. Describe several indicator forms of input voltage affecting output voltage
(1) Voltage regulation coefficient
1 Absolute voltage regulation coefficient K
When the load is constant, the ratio of the DC voltage variation ΔUo of the regulated power supply to the input grid voltage variation ΔUi is K=ΔUo/△Ui.
2 relative voltage regulation coefficient S
When the load is constant, the ratio of the relative change amount ΔUo/Uo of the regulator output DC voltage Uo to the relative change amount ΔUi/Ui of the input grid voltage Ui, that is, S=ΔUo/Uo / ΔUi/Ui.
(2) Grid adjustment rate
Indicates the relative change in the output voltage of the regulated power supply when the input grid voltage changes by +/- 10% from the rated value, sometimes expressed as an absolute value.
(3) Voltage stability
The load current is kept at any value within the rated range. The relative change of the output voltage caused by the change of the input voltage within the specified range is ΔUo/Uo (percentage), which is called the voltage stability of the regulator.
2. Several indicators of the effect of load on output voltage
(1) Load adjustment rate (also called current adjustment rate)
At rated grid voltage, the maximum relative change in output voltage, when the load current changes from zero to a maximum, is expressed as a percentage, often expressed as an absolute change.
(2) Output resistance (also called equivalent internal resistance or internal resistance)
Under the rated grid voltage, the output resistance changes to ΔUo due to the load current change ΔIL, and the output resistance is Ro=|ΔUo/ΔIL|Ω.
3. Several index forms of ripple voltage
(1) Maximum ripple voltage
The absolute value of the output voltage ripple (including noise) at rated output voltage and load current, usually expressed as a peak or rms value.
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