The adjustable stable power supply with functions of overload and short circuit protection

Published:2011/6/15 23:58:00 Author:Borg | Keyword: stable power supply, short circuit protection | From:SeekIC

1. The circuit is simple, the stable voltage is precise, and the output voltage remains the same after being imposed with a regulated load.2. It has functions of overload and short circuit protection and warning. When it is over-loaded, the voltage drop on resistor R8 is rising, when the voltage drops to 0.6V, the controllable silicon is conducting, which makes the basic LEV of Q1 drops to 1V or so, so the pipe Q1 and adjusting pipes of Q2 and Q3 are all blocked, and the adjusting pipe is protected from being burnt. After Q2 and Q3 are blocked, the output voltage becomes 0V, the electric switch Q4 is blocked, Q5 is conducting, so the multi-resonance oscillator composed of Q6 and Q7 is starting to oscillating(dozens of Hz ).



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