Loss-Less Coil Current Estimator for Peak Current Mode Control SMPS

摘要

The present disclosure relates to a high efficiency switched mode power supply (SMPS) having increased efficiency due to loss-less coil current estimation for current control. A circuit in the control unit of SMPS comprises a capacitor and the voltage on the capacitor is an integral of the current flowing into the cap over time and if there are current sources which depend on the input and the output voltage, periodically switched with the same signals as the P and N switches, the voltage on the charged capacitor has the same shape as the current through the coil. The signal gleaned from the capacitor voltage are used the same manner by the control unit as it was with the signals from prior art current sensing.

主权项

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 and a control circuit comprising a capacitor; and (2) estimating actual coil current without loss of power in order to control the SMPS.