Hysteretic Control for Transformer Based Power Converters

摘要

Hysteretic control for power converters. In an example arrangement, an apparatus includes a converter for converting an input voltage to an output voltage including a transformer; at least one primary side driver switch coupled to supply current from an input voltage terminal to the primary side of the transformer; at least one inductor coupled between the secondary side of the transformer and the output voltage terminal; at least one secondary side switch coupled between the inductor and a ground potential; and a hysteretic controller coupled to supply a first on-time signal to the at least one primary side switch and a second on-time signal to the at least one secondary side switch, the hysteretic controller configured for sensing the output voltage and having at least one current input coupled for sensing current flowing in the inductor and generating primary side driver switch on-time pulses to control the output voltage.

主权项

1. An apparatus, comprising:
a power converter for converting an input voltage to an output voltage, the power converter further comprising:
a transformer having a primary side and a secondary side coupled between an input voltage terminal and an output voltage terminal, respectively;at least one primary side power switch coupled to supply current from the input voltage terminal to the primary side of the transformer;at least one inductor coupled between the secondary side of the transformer and the output voltage terminal;at least one secondary side switch coupled between a node coupled to the inductor and the secondary side of the transformer, and a ground potential; anda hysteretic controller coupled to supply a first on-time signal to the at least one primary side switch and a second on-time signal to the at least one secondary side switch, the hysteretic controller having a feedback input coupled to the output voltage and configured for sensing the voltage at the output and having at least one current input coupled to the at least one inductor, and further configured for receiving a signal corresponding to the current flowing in the at least one inductor.