| 摘要 |
A regulated power supply capable of providing an output DC voltage of substantially constant level determined by an AC line voltage to a load irrespective of variations in load current. The regulated power supply comprises first and second rectifiers adapted to generate unregulated DC voltages in accordance with an input AC voltage, a control circuit coupled between the load and the first rectifier and including at least one active device, and a voltage comparator adapted to compare the output of the second rectifier and the output of the detector and generate an output proportional to a difference between the second rectifier output and the detector output, thereby controlling the control circuit and regulating the DC voltage to a constant level corresponding to the input AC voltage irrespective of variations in load current. The regulated power supply can prominently decrease a permissible dissipation of the active device in the control circuit and it is therefore very suitable for a power supply in an audio amplifier.
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