| 摘要 |
This invention relates to method s and apparatus for regulating the output voltage and/or current of switch mode power converter, in particular forward converters. A method of regulating the output voltage of a forward switch mode power converter, said power converter having a power input, a power output to provide said output voltage, a transformer with matched polarity primary and secondary windings coupled between said power input and said power output; and a switch to cyclically switch power from said power input on and off to said primary winding of said transformer to transfer power to said power output and a secondary side rectifier; the method comprising: sensing a voltage on said primary winding or on an auxiliary winding of said transformer during a period when said switch is of f and said secondary side rectifier is conducting; and controlling a proportion of time for which said switch is on, responsive to said sensing, to control said output voltage. |
