| 摘要 |
A switched-mode power supply ( 200, 300, 400 ) comprises a primary side, a secondary side and a transformer ( 103, 303, 403 ) therebetween. An output on the secondary side delivers an output voltage and an output current to a load. An output voltage control circuit ( 110, 113, 801 ) keeps the output voltage at a first level, corresponding to a first output current value. A circuit element ( 201, 301, 401 ) integrates over time a voltage obtained from the transformer ( 103, 303, 403 ) and produces a signal indicative of the integrated voltage, corresponding to a second output current value that is smaller than the first output current value. An output voltage modifier ( 113, 601, 801 ) responds to the signal by changing the output voltage from the first level to a second level.
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