Undervoltage power protection circuit with sluggish window wide region input

The utility model relates to an undervoltage power protection circuit with sluggish window wide region input, including comparator N3, reference source N1, bleeder circuit, voltage stabilizing circuitand switch circuit, the node between two series resistance R2, resistance R3 is connected to comparator N3's inverting input end, resistance R3's other end ground connection, and resistance R2's theother end is held for voltage input, comparator N3's non inverting input end links to each other with reference source N1's negative pole through resistance R4, reference source N1's plus earth, its reference edge be through electric capacity C1 ground connection, comparator N3's output links to each other with switch circuit's input, and comparator N3's non inverting input end is continuous rather than the output through resistance R5, voltage stabilizing circuit's input ground connection, its output links to each other with comparator N3's inverting input end. The utility model discloses simple, the difficult product