| 摘要 |
<p>In a switch mode power supply the switch current of the power switch (901) is connected (via 911) to a low pass filter network (904) during the time interval when current is flowing through the power switch (901). The filter network (904) is disconnected from the power switch when switch current is not flowing. This technique takes advantage of the fact that the average current through the power switch during its conduction interval is either equal to the output current of the power supply, or is proportional with the ratio between the average switch current and the output current being the fixed isolation transformer turns ratio. <IMAGE></p> |
