Electronics > Beginners
Over current protection devices question
T3sl4co1l:
That's your old circuit with the 136kHz and the D flip-flop and gate drivers and IRFP260s (or whatever they were), right?
It's pretty basic as switching supplies go, to add current limiting to that circuit. Example, limiting peak current by turning off the transistor (until it is next requested to turn on). This adds a current sense resistor, comparator and latch.
This also neatly solves the problem of exploding finals when subject to bad load impedances (high SWR). The current limit can be chosen to have no effect during normal (SWR within a certain limit) operation, or chosen to operate under certain conditions so that output power is limited (which may or may not introduce distortion, IM3 or such, depending on how exactly it's done).
Tim
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