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In a Switching Power Supply an Rc Network is Connected to the Input Side of the Lc Filter. This Rc Network is Used As the Feedback Means to Control And Regulate a Switching Power Supply.
English (United States)
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High-gain High-stabiliy Feedback for Switching Power Supply
In a Switching Power Supply an Rc Network is Connected to the
Input Side of the Lc Filter. This Rc Network is Used As the Feedback
Means to Control And Regulate a Switching Power Supply.
Referring to the drawing, the RC network is connected between the output
rectifiers 1 and 2 and the filter choke 3. Resistor 6 and capacitor 7 filter out the
large amplitude high frequency switching pulses to prevent their being fed back
to the supply's modulator. It is not necessary and in fact undesirable that the
filtering effect mimic the output filter. The DC level at the junction point of resistor
6 and capacitor 7 is used as the feedback point for control and regulation
In many cases where LC filters are used, the resonant frequency of the LC
filter is very low, often near the line ripple frequency. To get good line ripple
rejection, the gain of the feedback loop must be large enough to get the required
ripple rejection, but this gain requirement causes stability problems with the
conventional feedback connection.
The solution is to use the RC circuit ahead of the LC filter. Since the
feedback circuit essentially sees only the single pole of the RC circuit rather than
the double pole of the LC filter, it is possible to increase the gain of the feedback
loop while still maintaining stability.
An ideal power supply would have a constant voltage source driving the
output filter. If we were able to achieve a...