| 摘要 |
In a circuit arrangement, without a transformer, for generating small DC voltages (UA) from mains AC voltages (U &sinew& ), a capacitor (C) is charged with a voltage rectified by the rectifier (D). The phase-shifter (Ph) produces a phase-shifted voltage (UPh) which, via the switching logic (L), directly operates the switching element (T), which is constructed as a power MOSFET and interrupts the capacitor charging. The load (RL) is connected in parallel with the charging capacitor (C). <IMAGE>
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