| 摘要 |
A method of controlling a switch in a power converter in order to reduce switching power loss is disclosed. A trigger voltage level is set and the voltage level across the switch VDS is measured. If the voltage level of VDS is lower than the trigger voltage level the slope of VDS is determined. If the slope is less than zero the switch is turned on and the trigger voltage is lowered. If the slope is zero the switch is turned on and the trigger voltage stays the same. A timer is used to ensure the slope will approach zero. If the slope is positive the switch is turned on, the trigger voltage is raised, and the timer is told to turn on earlier. By repeated adjusting the trigger voltage level the slope approaches zero and maximum power loss reduction is achieved.
|
