ELECTRICAL POWER SUPPLY

摘要

A method supplies power from a power source to a load. The method includes, in a first mode, electrically coupling a step-down converter node of a step-down converter alternately to the power source via a conductive bypass path that bypasses a step-up converter and to ground. The step-up converter has an input electrically coupled to the power source and the step-down converter has an output electrically coupled to the load. The method further includes, in a second mode, coupling the step-down converter node alternately to the power source via the bypass path and to an output of the step-up converter.

主权项

1. An electrical power supply circuit for delivering power from a power source to a load, the electrical power supply circuit comprising:
an power input node coupleable to the power source; a step-up converter having an input coupled to the power input node; a step-down converter having a step-down converter node and an output coupleable to the load; a conductive bypass path; a switching stage that includes: a first switch configured to selectively couple the step-down converter node of the step-down converter to the input of the step-up converter via the bypass path that bypasses the step-up converter; a second switch configured to selectively couple an output of the step-up converter to the step-down converter node of the step-down converter; and a third switch configured to selectively couple the step-down converter node of the step-down converter to a ground; and a controller configured to:
in a first mode, open the second switch and, alternatingly:
close the first switch and open the third switch; andopen the first switch and close the third switch; andin a second mode, open the third switch and, alternatingly:
close the first switch and open the second switch; andopen the first switch and close the second switch.