Power supply with galvanic isolation from the network on optocouplers. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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Micropower IPs with galvanic isolation from the ~220 V mains can be made using optocouplers, including them in series to increase the output voltage.
Energy transfer is carried out by means of a unidirectional light flux inside the optocoupler (the optocoupler contains light emitting and absorbing elements), so there is no galvanic connection with the network. On one optocoupler, 0,5-0,7 V is allocated for AOD101. AOD302 and 4 V - for AOT102, AOT110 (inflow 0,2 mA). To provide the required values of voltage and current, optocouplers are connected in series or in parallel. As a buffer accumulating element, you can use an ionistor, a battery or a capacitance of 100-1000 microfarads.
LEDs are powered through a capacitance of not more than 0,2 microfarads to avoid destruction.
It must be remembered that the efficiency of optocouplers decreases over time (approximately 25% over 15000 hours of operation).
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