Abstract: A high accuracy constant-off average output current control is provided. It is composed of the reference block generates preset reference and converts the reference signal into a suitable format; the state detecting block, the state variables of switching power converter are detected and the detected signals are converted into the same signal format as one of output from reference block; The error-zero detector is used to detect the error between the outputs from reference block and state detected block and trigger constant off timer as the error is cross over zero; the constant off timer, the constant off time is dependent on the input and output voltages of the switching converter. Four function blocks can be simple as comprising of a basic operation and be implemented with several operation functions.

Abstract: A Pseudo Average Output Current Control scheme is provided. The control scheme allows only detecting one part of the inductor current of the switching converter to control the average output current of the switching converter follow the reference current. The control scheme is noise insensitive and makes the whole controlled system cost effective.