Patent ID: 8193795
Filing Date: 2012-06-05
Classification: H02M,H05B

Abstract:
1. A method for controlling an average output current provided by a power converter on the converter's output terminal in a plurality of consecutive periods of time of an equal length T, wherein the average output current in any one of said periods of time is Q/T where Q is a charge provided to the output terminal said one of the periods of time, the method comprising, for at least one period of time: (1) receiving, by a computing circuit, (i) an input-voltage-defining value which defines a sampled input voltage on the converter's input terminal, and (ii) an output-voltage-defining value which defines a sampled output voltage on the output terminal; and (2) calculating by the computing circuit a pulse-width-defining value PW1 which defines a pulse width of a control signal in said at least one period of time, the pulse width controlling the average output current, wherein the value PW1 is calculated as a function of (i) the input-voltage-defining value, (ii) the output-voltage-defining value, and (iii) a target value for the average output current to be delivered to the output terminal in said at least one period of time; wherein the converter is a boost converter; wherein the value PW1 is calculated to represent the pulse width as directly proportional to (a) a square root of said target value, and (b) a square root of said length T.