Back to results
US 4,908,755 AGranted
Method and circuit for limiting the output current of a flyback converter
AssigneeSiemens Aktiengesellschaft
InventorMartin Feldtkeller
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeSiemens Aktiengesellschaft
InventorMartin Feldtkeller
Estimating the term…
A method and circuit for limiting the output current of a power supply with a self oscillating flyback converter, controls a primary peak current as a function of input and output voltages of the flyback converter. A quotient is formed from two given input variables and multiplied by a first constant. A second constant is added thereto and then multiplied by a third constant. The two input variables are defined by the input and output voltage of the flyback converter. The output voltage of the flyback converter is divided by the input voltage of the flyback converter in the quotient formation. The output variable is provided as a manipulated variable for controlling the primary peak current. The three constants are dimensioned for simulating a formal dependency existing in the flyback converter between the input and output voltages and the primary peak current of the flyback converter.
Method for limiting the output current of a power supply with a self oscillating flyback converter, by controlling a primary peak current as a function of input and output voltages of the flyback converter, which comprises forming a quotient from two given input variables and multiplying the quotient by a first constant, adding a second constant thereto and then multiplying by a third constant;
Circuit for limiting the output current of a power supply with a self oscillating flyback converter, by controlling a primary peak current as a function of input and output voltages of the flyback converter, comprising an analog calculating circuit for controlling the primary current, said analog calculating circuit including a divider stage with given amplification over which the input and output voltages of the flyback converter are applied, a multiplier stage receiving an output signal of said divider stage and an input value, and an adding stage receiving an output signal of said multiplier stage and the input value.
Dependencies are inferred from the claim text.