• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
  • Skip to footer
Hardware Secrets

Hardware Secrets

Uncomplicating the complicated

  • Case
  • Cooling
  • Memory
  • Mobile
    • Laptops
    • Smartphones
    • Tablets
  • Motherboard
  • Networking
  • Other
    • Audio
    • Cameras
    • Consumer Electronics
    • Desktops
    • Museum
    • Software
    • Tradeshows & Events
  • Peripherals
    • Headset
    • Keyboard
    • Mouse
    • Printers
  • Power
  • Storage
  • Video

Everything You Need to Know About Power Supplies

Everything you need to know about power supplies, including cables, connectors, efficiency, PFC, protections, form factors, ripple & noise, voltage stability, maximum power, virtual rails and much more.

Home » Everything You Need to Know About Power Supplies

Intro

Contents

  • 1. Intro
  • 2. AC Connection
  • 3. Power Plugs
  • 4. Power Plugs (Cont’d)
  • 5. Older Power Plugs
  • 6. Form Factors
  • 7. Cooling
  • 8. Power
  • 9. Efficiency
  • 10. Power Factor Correction (PFC)
  • 11. Voltage Stability, Noise and Ripple
  • 12. Multiple +12 V Rails
  • 13. Protections
  • 14. Pin-Out

In this tutorial we will explain everything you need to know about PC power supplies, including form factors, efficiency, power factor correction (PFC), rails, protections, ripple and much more. You will learn that the power supply power rating should not be the only factor to consider when buying a power supply unit.

But before going further, let’s explain exactly what a power supply does.

As an electrical device, the computer needs power in order for its components to operate properly. The device responsible for supplying power to the computer is the power supply. In short, we could say that the main function of the power supply is to convert alternating voltage (a.k.a. AC), which is supplied by the electrical power system into continuous voltage (a.k.a. DC). In other words, the power supply converts the conventional 110V or 220V alternating voltage into continuous voltage used by the PC electronic components, which are +3.3 V, +5 V, +12 V and -12 V (Alternating voltages vary throughout the world. In this tutorial, we will use “110 V” as a catchall label for 110 V, 115 V and 127 V voltages, whereas we will use “220 V” as a catchall label for 220 V, 230 V and 240 V voltages. Japan, which uses a 100V power grid, is the only country outside this range.) The power supply is also present in the PC cooling process, as we will explain in detail later.

There are two basic power supply designs: linear and switching-mode.

Linear power supplies work by getting the 110 V or 220 V from the power grid and lowering its value (e.g., 12 V) by using a transformer. This lower voltage is still AC. Then rectification is done by a set of diodes, transforming this AC voltage into pulsating voltage. The next step is filtering, which is performed by an electrolytic capacitor, transforming this pulsating voltage into almost DC. The DC obtained after the capacitor oscillates a little (this oscillation is called ripple), so a voltage regulating stage is necessary, made by a zener diode (frequently with the aid of a power transistor) or by a voltage regulator integrated circuit. After this stage the output is true DC voltage.

Although linear power supplies work very well for several low-power applications – cordless phones is an application that comes to mind – when high power is needed, linear power supplies can be very large.

The size of the transformer and the capacitance (and thus the size) of the electrolytic capacitor are inversely proportional to the frequency of the input AC voltage; the lower the AC voltage frequency, the bigger the size of those components and vice-versa. Since linear power supplies still use the 60 Hz (or 50 Hz, depending on the country) frequency from the power grid (which is a very low frequency), the transformer and the capacitor are huge.

Building a linear power supply for the PC would be insane, since it would be very big and heavy. The solution was to use the high-frequency switching approach.

On high-frequency switching mode power supplies (a.k.a. SMPS), the input voltage has its frequency increased before going into the transformer (in the range of kHz are typical values). With input voltage frequency increased, the transformer and the electrolytic capacitors can be very small. This is the kind of power supply used on the PC and several other types of electronic equipment, such as DVD players. Keep in mind that “switching” is short for “high-frequency switching,” which has nothing to do with whether the power supply has an on/off switch or not…

The power supply is probably the most neglected component on PC. Usually when buying a computer, we just take on account the processor type and clock, the motherboard model, the video card model, the quantity of installed memory, the hard disk storage capacity, and we forget about the power supply, which, in fact, is the one who supplies the “fuel” for the PC parts to operate properly.

A power supply of good quality and with enough capacity can increase the durability of your equipment and reduce your electricity bill (we will explain why when discussing efficiency). Just to get an idea, a high-quality power supply will cost less than 5% of the PC total price. On the other hand, a low-quality power supply can cause several intermittent problems, most of which are difficult to solve. A defective or bad-intentioned power supply can lock the PC, result in hard disk bad blocks, cause the infamous “blue screen of death” errors, andgive rise to random resets and freezings, added to many other problems.

In this tutorial, we will discuss the basics that every user should know. If you want to learn even more about the internals of a PC power supply we recommend that after reading this tutorial, you read its sequel, Anatomy of Switching Power Supplies, where we explain in detail how the major internal components of a PC power supply work.

Continue: AC Connection

Power Tutorials

Primary Sidebar

As a participant in the Amazon Services LLC Associates Program, this site may earn from qualifying purchases. We may also earn commissions on purchases from other retail websites.

gigabit ethernet device

The Ultimate 2022 Guide on Gigabit Ethernet

Everything you need to know about Gigabit Ethernet.

spdif connection

What You Should Know About the SPDIF Connection (2022 Guide)

Learn about the digital audio connection called SPDIF and when and how to use it.

Everything You Need to Know About the CPU Power Management

The CPU has several power saving modes called C-states. In this tutorial we will explain what these modes are, what they do and the modes supported by each processor.

Understanding RAM Timings

Learn in detail what numbers like 7-7-7-21, 8-8-8-24, or 9-9-9-24 after the memory specification mean.

How to Connect Two PCs Using a USB to USB Cable in 2022

Learn how to connect two PCs using an USB-USB cable to transfer files and share your Internet connection.

Footer

For Performance

  • PCI Express 3.0 vs. 2.0: Is There a Gaming Performance Gain?
  • Does dual-channel memory make difference on integrated video performance?
  • Overclocking Pros and Cons
  • All Core i7 Models
  • Understanding RAM Timings

Everything you need to know

  • Everything You Need to Know About the Dual-, Triple-, and Quad-Channel Memory Architectures
  • What You Should Know About the SPDIF Connection (2022 Guide)
  • Everything You Need to Know About the Intel Virtualization Technology
  • Everything You Need to Know About the CPU Power Management

Follow Us

Follow us on Facebook Follow us on Twitter Follow us on Instagram

Copyright © 2022 · All rights reserved - Hardwaresecrets.com
About Us · Privacy Policy · Contact