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• • • • • • • • • • • • • • • • The industry push toward smaller, lighter and more efficient electronics has led to the development of switching-mode power conversion technology some four decades ago. By definition, switching power supplies (SMPS) are devices which use in their operation power handling electronic components which are continuously commutating on and off with a relatively high frequency. These electronic switches effectively connect and disconnect energy storage inductor(s) and capacitor(s) to and from the input source or the output. Output filters are then 'averaging' energy transfer rate and provide continuous current flow into the load. By varying duty cycle, frequency or phase shift of these commutations, a desired output parameter (such as voltage) is controlled.

Of course, you can't learn SMPS design from a single webpage-- this guide is intended to provide just a starting point. The typical frequency ('F') range of an circuit is from 50 kHz to 500 kHz. DC-DC converters with low-voltage input can operate up to several MHz. The high 'F' results in the smaller size of switch-mode power supplies since generally, the size of power transformers, inductors and filter capacitors is inversely proportional to frequency.

The ARRL Handbook for. RF power amplifiers and switch-mode power supplies. According to the ARRL. Reader is a free download at www.adobe.com. PowerEsim is free SMPS power supply design, manufacturer & product database/list, switching converter topologies, circuit analysis, magnetic design software.

Switch mode operation also reduces energy losses and increases efficiency- when a switch is 'off', its current is near zero; when it is 'on', the voltage across it is low. On the other hand, this mode of operation introduces the switching losses due to overlap of current and voltage during each transition, which increase with operating frequency. Pc Racing Games 2004 List. It also introduces additional electrical noise (EMI). Volt-second balance for L in continuous mode: (Vin-V Q-Vout)×ton= (Vout+V D)×toff Solving for Vout: Vout=(Vin-V Q)D-V D(1-D). Neglecting V Q and V D: Vout≈VinD, where D=ton/(ton+toff)- duty cycle The EMI acceptable limits depend on the application. In most applications the EMI limits begin at 150 kHz. Therefore, the engineers often select F.

Below you will find theory, SMPS schematics and design guides, power electronics tutorials and other useful online resources for the engineers and hobbyists. If you don’t like to randomly surf the web, this list will save you hours of research.