CONVERSION CIRCUIT WITH HYSTERESIS CONTROL AND POWER SUPPLY SYSTEM

摘要

A conversion circuit with hysteresis control and a power supply system. The circuit comprises a PMOS tube (1) and an NMOS tube (2) connected in series between a voltage input terminal and a ground, a first voltage-dividing resistor bank (3) connected in series between a voltage output terminal and the ground, a comparator (4) and a logic controller (5). The output terminal of the comparator is connected to the input terminal of the logic controller. Both of the output terminals of the logic controller are respectively connected to the gates of the PMOS tube and the NMOS tube. The conversion circuit further comprises a negative feedback module (6) connected between the voltage output terminal and the input terminal of the comparator. The negative feedback module (6) performs a negative feedback control for the output voltage of the conversion circuit so as to clamp the output voltage to a preset reference voltage. With the conversion circuit, errors in the output voltage of a hysteresis BUCK converter are eliminated.