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Tom asked What products could I use to convert mains electricity (230V AC) to 36 Volt DC at up to 15 Amps?
Looking for a compact and value-for-money solution. Size-wise it should be able to fit in one hand ideally.
And got the following answer:
A 50Hz or 60Hz transformer won't work, it would be quite large and heavy compared to your requirements. You need a switchmode power supply. These convert the 230 VAC to about 300 VDC with a bridge rectifier and capacitor then use a DC-DC converter to step that down to the 36 volts you need. The DC-DC converter uses a power transistor(s) to convert the 300 volts DC to a square wave at 20kHz, which is applied to a small high frequency transformer, the output of which is rectified and filtered to get the DC. The reason that this approach is smaller and lighter is that a 20 kHz transformer is much smaller and lighter than one for 50 Hz. Note for Ken, who thinks 120 VAC is more common than 220/240 VAC, note that the entire world except North America uses 220/240. .