| Electronics > Projects, Designs, and Technical Stuff |
| 220V to 12V converter help |
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| Achu:
Hi, I need a circuit diagram for a 230V to 12V converter.Ineed to use it as the auxiliary supply in an smps I intend to make. Also an explanation on its working will be really helpful. Thanks |
| DannyTheGhost:
Almost every auxiliary power supply you will see in SMPS is using flyback topology for its simplicity (you need to concentrate on design of much beefier SMPS) If you need to understand basics of flyback operation - see for chips like UCx48x If you need something like 'put it all together ASAP' - see for chips like VIPERx series, which has embedded high-voltage MOSFET and fixed operation frequency for given chip type P.S. my suggestions are a little bit outdated and kinda old, but surely easily obtainable |
| strawberry:
cheaper option is to use nonisolated BUCK converter LNK3202 usually used for LED power supply |
| Achu:
I'm looking for a more discrete version. Also is RC (Ringing Choke) converters suited for my purpose? |
| mariush:
How much current? How efficient? If the current is low enough, you could use a single chip, a linear regulator.... here's LR8K4 : https://uk.farnell.com/microchip/lr8k4-g/linear-volt-reg-0-02a-440v-to/dp/2448524 It takes up to 440v in, outputs up to 20mA ... though keep in mind it will dissipate difference as heat... so maybe 2-3w max of heat. Can't just give it 350v DC (full bridge rectified 230v AC) and expect 12v at 20mA cause that would mean chip needs to dissipate (350v - 12v ) x 0.02 = ~6.8w So for example : diode for half wave rectification of AC voltage, small capacitor, big enough to guarantee minimum 24v at around output current + a few mA to the regulator, regulator, capacitor on output -> 12v |
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