Clear DefinitionsPower Supply Unit (PSU)
1 min read
Pronunciation
[pow-er suh-lye unit]
Analogy
Like a transformer and regulator that takes wall electricity and outputs the exact voltages your computer components need.
Definition
A component that converts AC mains electricity into regulated DC voltages required by computing hardware, providing stable power to motherboards, GPUs, and storage devices.
Key Points Intro
PSUs deliver and regulate the DC power rails essential for reliable hardware operation.
Key Points
Voltage rails: Provides +12V, +5V, +3.3V lines with tight regulation.
Efficiency rating: 80 PLUS certification indicates energy efficiency.
Protections: Over‑voltage, under‑voltage, over‑current, and short‑circuit.
Form factor: ATX, SFX, or server‑specific sizes.
Example
A mining rig uses a 1200 W 80 PLUS Gold PSU to power six GPUs and a motherboard reliably under load.
Technical Deep Dive
Modern PSUs use active PFC, LLC resonant converters, and synchronous rectification to achieve >90% efficiency. TTL-level power-good signals ensure proper sequencing.
Security Warning
Faulty PSUs can damage components or cause fire; use certified units and maintain proper ventilation.
Caveat
High-capacity PSUs are expensive; match capacity to load with headroom for spikes.
Power Supply Unit (PSU) - Related Articles
No related articles for this term.