Patent ID: 9136698
Filing Date: 2015-09-15
Classification: H02H

Abstract:
1. A power supply selector, comprising: a plurality of power input nodes, a power output node, a first transistor and a second transistor, wherein each of the plurality of power input nodes is coupled to a first switch having a first on-resistance and to a second switch having a second on-resistance, wherein the second on-resistance is greater than the first on-resistance, and wherein the first switch and the second switch are coupled in parallel, wherein the power supply selector is configured to couple a selected one of the power input nodes to a source of the first transistor and to a gate of the second transistor so as to sense a sense voltage at the selected one of the power input nodes, and wherein the power supply selector is configured to couple the power output node to a gate of the first transistor and to a source of the second transistor so as to sense an output voltage at the power output node, and wherein a drain of the first transistor and a drain of the second transistor is coupled to a common switching line for providing a switching signal indicative of a switching status of the first switch; wherein the common switching line is coupled to a gate of the first switch, and wherein the power supply selector is configured to switch-off the first switch, if the switching signal is in a high state.