Table of Contents
What Is Voltage Regulation?
Voltage regulation measures how well a power supply maintains a constant output voltage as the load current changes. It is expressed as a percentage of the full-load voltage. A perfect power supply would have 0% regulation, meaning the output voltage stays exactly the same regardless of load.
Good voltage regulation is essential for sensitive electronic equipment. Poor regulation can cause flickering lights, computer malfunctions, and damage to electronic components. Transformers, generators, and electronic power supplies all have characteristic regulation values.
Voltage Regulation Formula
Typical Regulation Values
| Source | Typical Regulation |
|---|---|
| Linear Regulator | 0.01-0.1% |
| Switching Regulator | 0.5-2% |
| Distribution Transformer | 2-4% |
| Generator (unregulated) | 5-10% |
Frequently Asked Questions
What is acceptable regulation?
For most applications, under 5% is acceptable. Sensitive electronics require under 1%. Laboratory power supplies achieve under 0.01% regulation.
What causes poor regulation?
High internal resistance/impedance of the source, undersized conductors, and overloaded transformers all worsen regulation. Temperature changes can also affect regulation.
Is negative regulation possible?
Yes, if the loaded voltage is higher than the unloaded voltage (e.g., with leading power factor loads on generators), regulation can be negative. This is uncommon but occurs in some capacitive load scenarios.