Patent ID: 9110489
Filing Date: 2015-08-18
Classification: G05F,H02M

Abstract:
1. A method to improve efficiency of a switched mode power supply (SMPS) system, the method comprising the steps of: (1) providing a switched mode power supply system comprising a first and a second switch, a coil, wherein the coil is charged from an input voltage of the SMPS system while the first switch is closed during a first period and the coil is discharged to an output voltage while the second switch is closed during a second period, and a control circuit comprising a capacitor and a first and a second current source, wherein the second current source is depending on the output voltage and the first current source is periodically switched with a same signal as the first switch; and (2) estimating actual coil current without loss of power in order to control the SMPS; wherein a voltage across the capacitor has a same shape as the current through the coil and the estimation of the coil current is performed based on an equation: wherein v