In contrast, a linear power supply regulates the output voltage by continually dissipating power in the pass transistor. Voltage regulation is achieved by varying the ratio of on-to-off time (also known as duty cycles).
A hypothetical ideal switched-mode power supply dissipates no power. Unlike a linear power supply, the pass transistor of a switching-mode supply continually switches between low- dissipation, full-on and full-off states, and spends very little time in the high dissipation transitions, which minimizes wasted energy. Like other power supplies, an SMPS transfers power from a DC or AC source (often mains power, see AC adapter) to DC loads, such as a personal computer, while converting voltage and current characteristics. An adjustable switched-mode power supply for laboratory useĪ switched-mode power supply ( switching-mode power supply, switch-mode power supply, switched power supply, SMPS, or switcher) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently.
The coil and large rectangular yellow capacitor below the bridge rectifier form an EMI filter and are not part of the main circuit board. In close proximity, filter coils for the other secondaries Power supply with switching regulator Interior view of an ATX SMPS:īetween B and C: heat sink for switching active components of primary voltage īetween C and D: heat sink for switching active components of at least five secondary voltages, per the ATX specification ĭ: output filter coil for the secondary with the largest power rating.
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