POWER SUPPLY AND LOAD PROTECTION SYSTEM

摘要

PURPOSE: A power supply unit and a load protection system are provided to prevent damage from fire by preventing a flow of an excess current in load. CONSTITUTION: An output unit (100) includes a pair of output terminals and a pair of sensing terminals. A polarity voltage sensing unit (200) outputs a polarity voltage signal. A current sensing unit (300) outputs a current signal. A sensing voltage sensing unit senses a voltage difference between a pair of sensing lines. The sensing voltage sensing unit outputs the sensing line voltage signal. [Reference numerals] (10) AC power applying unit; (100) Output unit; (210) (+) polarity voltage sensing unit; (220) (-) polarity voltage sensing unit; (300) Current sensing unit; (400) Sensing line voltage sensing unit; (511) Sensing error monitoring unit; (512) Sensing error reference value setting unit; (513) Sensing error detection unit; (521) Output current and output voltage monitoring unit; (522) Overvoltage and overcurrent reference value setting unit; (523) Overvoltage and overcurrent detection unit; (531) Output current setting unit; (532) Output voltage setting unit; (610) Output current error detector; (620) Output voltage error detector; (630) Control setting unit; (710) Current sensing and blocking unit; (720) Voltage sensing and blocking unit; (C1,C4) A/D converter; (C2,C3) D/A converter