Line regulation refers to an indicator measuring how much the output voltage (Vout) fluctuates in response to changes in the power supply's input voltage (Vin). Ideally, output voltage should remain constant despite input voltage fluctuations, with a variation rate of 0 %. This performance metric is evaluated using the following expression:
where ΔVout represents the change in output voltage and ΔVin represents the change in input voltage. For example, if input voltage changes from 100 V to 110 V while output voltage shifts from 5.00 V to 5.05 V, the calculation yields: (5.05 − 5.00) / (110 − 100) = 0.005 V / 10 V = 0.05 %/V.
Standard measurement conditions specify varying input voltage between 90 % and 110 % of the rated value (e.g., 90 V to 110 V for a 100 V-rated supply), maintaining full-rated load, and conducting tests at 25 °C ambient temperature. Under these conditions, smaller variation values indicate superior output stability against input fluctuations.
Strong line regulation performance proves particularly critical in applications exposed to electrical noise or unstable power environments, such as industrial equipment and automotive systems. In high-precision electronic devices, even minor line regulations can compromise output quality, necessitating comprehensive design countermeasures.
To minimize line regulation effects, engineers typically employ combinations of input filters, ripple suppression circuits, and voltage regulation components. These integrated approaches ensure stable output performance despite challenging input conditions.
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