The Ultimate switching mode power supply design reviews

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John asked how does a power supply in a circuit work?

I am doing a science project and i have to explain how everything works in a circuit and i cannot find any information about how the power supply works. please help!

And got the following answer:

There are several types of power supply. Most are designed to produce a low voltage DC supply. The most basic type is a transformer, followed by four diodes arranged as a bridge rectifier which converts the transformer's AC output to DC. Alternatively the transformer may use a centre tap and two diodes to rectify, or even just a single diode in series with the transformer. This is then followed with a large capacitor to smooth the output. More modern machines mostly use switched mode power supplies, these are more complex but are smaller and cheaper to produce. These work more like an inverter, a device to produce high voltage AC from a low voltage DC supply, as used in caravans and other portable battery powered situations. A switched mode power supply first rectifies the mains supply and smooths it with a capacitor, producing a high voltage DC supply. From this it runs an oscillator to produce a high frequency AC signal. This signal is used to control a switching transistor between the high voltage DC and a transformer, effectively turning the high voltage DC into AC so that it can be put through the transformer. The low voltage AC output from the transformer is then rectified back to DC. Because a switched mode PSU uses high frequency AC this means that its transformer can be much smaller than one that runs at the low frequency of the mains electricity. This smaller transformer saves a lot of weight, size and money so more than offsets the disadvantage of having more components. Instead of an oscillator many switched mode power supplies use the output from the transformer to control the pulsing of the input. This reduces the amount of components needed and makes the system run at the natural resonant frequency of the transformer. However, if any component fails in such a way as to stop it from feeding back properly then the switching of the input stops. This means that high voltage DC is applied to the transformer's input, resulting in the destruction of either the switching transistor or the transformer, often along with several other components. This makes fault diagnosis of these power supplies much more tricky than a traditional transformer/rectifier/capacitor type power supply. Not only that but annoyingly it's common to replace several faulty components, switch it on and your new components just explode because of one faulty component that you didn't notice stopping the feedback from working correctly.


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