Controllers for power converters

Abstract

In a controller for a power converter, a control terminal can provide a control signal to control a power converter. A cycle of the control signal includes a first time interval and a second time interval. The control circuitry can increase a primary current flowing through a primary winding of transformer circuitry and a secondary current flowing through a secondary winding of the transformer circuitry in the first time interval, and can terminate the increasing of the primary current in the second time interval. The control circuitry can also control the first time interval to be inversely proportional to an input voltage provided to the primary winding.

Description

technical field [0001] The invention relates to the field of power supply, in particular to a controller, a power converter and a method for controlling the power converter. Background technique [0002] figure 1 is a schematic circuit diagram of an existing DC / DC converter 100 . The DC / DC converter 100 includes a transformer 102 and a switch SW0 connected in series with the primary coil of the transformer 102 . The control signal 106 controls the output power of the DC / DC converter 100 by controlling the switch SW0. For example, the control signal 106 connects the primary winding of the transformer 102 to a power source, such as a DC voltage V DC , so that there will be a primary current I P flows through the primary winding of the transformer 102 . Correspondingly, the secondary current I S The current flows through the secondary coil of the transformer 102 and through the inductor L, and flows to the output terminal of the DC / DC converter 100 . At the same time, th...

AI Technical Summary

Problems solved by technology

Therefore, the DC / DC converter 200 cannot reasonably control the output voltage V OUT

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