Patent ID: 7570020
Filing Date: 2009-08-04
Classification: H02J,H02M

Abstract:
1. A circuit for battery charging and buck conversion, comprising: a first switch circuit that is coupled between a power source input node and a switch node, wherein the first switch circuit has at least a control input, and wherein a power source is connectable to the power source input node; a first switching regulator controller circuit having at least a feedback input and an output, wherein the output of the first switching regulator controller circuit is coupled to the control input of the first switch circuit; a second switch circuit that is coupled between a battery node and the switch node, wherein the second switch circuit has at least a control input, and wherein a battery is connectable to the battery node; a second switching regulator controller circuit having at least a feedback input and an output, wherein the output of the second switching regulator controller circuit is coupled to the control input of the second switch circuit, and wherein the second switching regulator controller circuit is a buck controller circuit; and a switching regulator selection control circuit having at least a first input and a second input, wherein the first input of the switching regulator selection control circuit is coupled to the power source input node; the second input of the switching regulator selection control circuit is coupled to the battery node; and wherein the switching regulator selection control circuit is operable to control a disabling that is associated with the second switching regulator controller circuit if voltage is present at the first input of the switching regulator selection control circuit, and further operable to control a disabling that is associated with the first switching regulator controller circuit if voltage is present at the second input of the switching regulator selection control circuit and voltage is not present at the first input of the switching regulator selection control circuit.