Switching power supply having loading condition remembrance and improved hold-up time characteristics

摘要

A switching power supply comprises one or more power supply stages that receive power from an input power source and that generate a regulated output voltage for powering a load by alternately opening and closing a set of switches. Controller circuitry monitors the input power source for loss of power as well as a state of the load. When loss of power is detected, the controller circuitry saves a state of the load.

主权项

1. A switching power supply comprising:
one or more power supply stages that receive power from an input power source and that generate a regulated output voltage for powering a load by alternately opening and closing a set of switches; and controller circuitry that monitors the input power source for loss of power and that monitors a state of the load, and when loss of power is detected, the controller circuitry saves a state of the load, wherein the state of the load represents a level of power drawn by the load.