Patent ID: 6069472
Filing Date: 2000-05-30
Classification: H02M

Abstract:
A switching circuit which uses at least a first switching transistor (12) and a second switching transistor (14) to generate power at an output voltage which is a function of a duty cycle of an input control signal and voltages at a positive rail and a negative rail, wherein the first switching transistor switches current from the positive rail through a first current node (70) to an output load and the second switching transistor switches current from the negative rail through a second current node (72) to the output load, the switching circuit comprising:a first inductor (62) coupled between the first current node and a first intermediate node (152);a second inductor (64) coupled between the second current node and a second intermediate node (154);a first diode means (66) for substantially limiting flow of current to one direction, wherein current flows through the first diode means from the second current node to the positive rail when the first diode means is forward biased;a second diode means (68) for substantially limiting flow of current to one direction, wherein current flows through the second diode means from the negative rail to the first current node when the second diode means is forward biased;a first output inductor (136), coupled between the first intermediate node and an output node (16), wherein the output load is coupled to the output node; anda second output inductor (134), coupled between the second intermediate node and the output node.