Patent ID: 8971069
Filing Date: 2015-03-03
Classification: H02J,H02M

Abstract:
1. A circuitry for a power supply, comprising: a controller of the power supply, the controller having a startup circuit; and a startup and input capacitor balancing circuit for the power supply, the startup and input capacitor balancing circuit comprising: an input capacitance operable to filter input power for the power supply, the input capacitance having a first capacitor and a second capacitor coupled in series between an input voltage and a first node and configured to filter the input voltage; a voltage divider circuit coupled to the input voltage and operable to generate a divided voltage therefrom; and a buffer circuit operable to receive the divided voltage and, if the first capacitor and the second capacitor are not balanced, to provide current to the input capacitance to balance the first capacitor and the second capacitor, wherein the buffer circuit is operable to provide power for the startup circuit of the controller of the power supply.