On time control and gain circuit

摘要

A voltage regulating control loop for a boost converter having a gain stabilizing stage is provided. The gain stabilizing stage makes the open-loop AC gain independent of the DC output of the boost converter and of the root mean square value of the 50/60 Hz line input voltage. The gain stabilizing stage generates an error voltage that is proportional to the square root of a voltage that is a function of the DC output current divided by the root mean square value of the 50/60 Hz line voltage. The error voltage is compared to the integrated value of a signal inversely proportional to the error voltage to the on time of the power stage FET.