SWITCHED MODE DCDC CONVERTER EFFICIENCY IMPROVEMENT BY ADAPTIVE DRIVER STAGE

摘要

In a switched mode inductive DCDC converter having a first mode that conducts a first current path through an inductor and through a first switch, and a second mode that conducts a second current path through the inductor and through a second switch, a detecting component detects a parameter. The detecting component outputs a biasing signal extend the turn OFF time of one of the switches in order to decrease a voltage build up on the other switch.

主权项

1. A circuit operable to receive an input DC voltage and to output an output DC voltage, said circuit comprising:
an inductor operable to generate a converted voltage based or the input DC voltage; an output node operable to output the output DC voltage; a first field effect transistor disposed in series between said inductor and said output node; a second field effect transistor disposed in series between said inductor and ground; a controller operable to generate a control signal to control one of said first field effect transistor and said second field effect transistor, the control signal being able to control said one of said first field effect transistor and said second field effect transistor to be in a first state, to control said one of said first field effect transistor and said second field effect transistor to be in a second state, to control said one of said first field effect transistor and said second field effect transistor to switch from the first state to the second state and to control said one of said first field effect transistor and said second field effect transistor to switch from the second state to the first state; and a detecting component operable to detect a parameter associated with one of said first field effect transistor and said second field effect transistor and to output a bias signal based on the detected parameter, wherein, in the first state, one of said first field effect transistor and said second field effect transistor is ON and the other of said first field effect transistor and said second field effect transistor is OFF, wherein, in the second state, the one of said first field effect transistor and said second field effect transistor is OFF and the other of said first field effect transistor and said second field effect transistor is ON, wherein said detecting component is arranged with said controller such that the bias signal modifies the control signal so as to extend a turn OFF time, and wherein the switching time is one of when said first field effect transistor switches from the first state to the second state, when said second field effect transistor switches from the first state to the second state, when said first field effect transistor switches from the second state to the first state, and when said second field effect transistor switches from the second state to the first state.