A novel analog implementation of capacitor charge balance controller with a practical extreme voltage detector
In this paper, a practical analog implementation of capacitor charge balance controller is presented, which is capable of achieving the optimal response for dc-dc Buck converters without relying on the knowledge of the nominal passive component (output inductor and capacitor) value. This ready-for-integration analog controller applies the output voltage curve analysis for deriving the formulas to optimize the response under the load transients. A simple extension is also offered for adaptive voltage positioning (AVP) application to power the modern processors. Furthermore, an operational amplifier (OPAMP) based peak/valley voltage detector is presented in place of using a fast or asynchronous ADC, as a result, lower cost, lower operating power consumption and fully analog implementation can be expected. Finally, simulation and experimental results are provided to validate the proposed schemes.