SYSTEM AND METHOD FOR PROVIDING POSITIVE AND NEGATIVE VOLTAGES WITH A SINGLE INDUCTOR

摘要

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for providing positive and negative voltages using a single inductor. In one aspect, the apparatus includes a single inductor having a first end and a second end. The first end is coupled to a first switch and configured to connect to either a power source or a negative output node depending on the state of the first switch. The second end is coupled to a second switch and is configured to connect to either a ground potential or a positive output node depending on the state of the second switch. The apparatus further includes a controller adapted to configure the switches into one of a plurality of configurations at a time.

主权项

1. A power supply capable of providing a negative output voltage and a positive output voltage, the power supply comprising:
a power source; an inductor having a first end and a second end, the first end coupled to at least a first switch and being configured to connect to either the power source or a negative output node depending on the state of the first switch, the second end coupled to at least a second switch and being configured to connect to either a ground potential or a positive output node depending on the state of the second switch, the negative output node being configured to generate the negative output voltage, the positive output node being configured to generate the positive output voltage; and a controller adapted to configure the first and second switches into at least:
a first configuration in which the first end of the inductor is connected to the negative output node while the second end of the inductor is connected to the positive output node, causing a current to flow from the negative output node to the positive output node through the inductor;a second configuration in which the first end of the inductor is connected to the power source while the second end of the inductor is connected to the ground potential, causing a current to flow from the power source to the ground potential through the inductor;a third configuration in which the first end of the inductor is connected to the power source while the second end of the inductor is connected to the positive output node, causing a current to flow from the power source to the positive output node through the inductor; anda fourth configuration in which the first end of the inductor is connected to the negative output node while the second end of the inductor is connected to the ground potential, causing a current to flow from the negative output node to the ground potential through the inductor.