Over-current protection circuit
An over-current protection circuit and protection circuit technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as limiting the application range of over-current protection circuits, improve reliability, ensure accurate sampling, and improve conversion efficiency effect
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[0012] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0013] combine figure 1 As shown, in the following embodiments, the overcurrent protection circuit includes:
[0014] A fold-back circuit, when over-current occurs, the output current decreases with the decrease of the output voltage, which greatly reduces the system's over-current shutdown power consumption; a core protection circuit, because the sampling resistor is not connected in series with the adjustment tube, there is no loss Voltage drop improves the conversion efficiency of the system; a negative feedback circuit ensures accurate sampling of the output current and greatly improves the reliability of overcurrent protection.
[0015] Described core protection circuit is made of PM4 tube, PM5 tube, PM6 tube, NM3 tube, resistance R3 and a comparator; Wherein PM6 tube is adjusting tube, and PM4 tube is sampling tube, and R3 is sampling res...
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