Patent ID: 8699243
Filing Date: 2014-04-15
Classification: H02M,Y02B

Abstract:
1. A power converter that converts alternating current (AC) power to direct current (DC) power for powering a load using a load current, comprising: a transformer having a primary side that receives an AC signal and having a secondary side; a first transistor coupled to the primary side; a first control circuit that controls the first transistor to provide a current through the primary side; a diode configured to couple in series with the load on the secondary side; a second transistor that bridges the diode; and a second control circuit that controls the second transistor, the second control circuit comprising a pulse counting circuit to count a number of pulses per unit time in the first and second transistors, wherein the second control circuit is configured to perform synchronous rectification operations using the second transistor and is configured to inhibit the synchronous rectification operations based at least partly on information on the load current, the information on the load current comprising a voltage proportional to the number of pulses per unit time in the first and second transistors.