Secondary side control power converter

Abstract

The utility model relates to a secondary side control power inverter, comprising an input circuit and at least one switching element. A primary side winding of a transformer, the voltage variation of which can change the on and off state of the switching element, is connected with the switching element, and a secondary side winding is arranged on the transformer. An output circuit is connected with the secondary side winding of the transformer, which is provided with an output end; a controller is positioned on the output circuit, which can sense the output voltage and tickle the corresponding voltage variation sensed to the primary side winding of the transformer; thus, the switching element can be controlled by the primary side winding of the transformer to make PWM or PFM switch motions in response to the motions.

Description

technical field [0001] The invention relates to a power converter, in particular to a secondary-side controlled power converter, which can control the on and off actions of switching elements on the primary side of a transformer. Background technique [0002] Switching power converters have the characteristics of high efficiency and small size, and are currently widely used in various electronic devices, such as Figure 11 Shown is one of the circuit structures of the conventional flyback converter, and its circuit structure mainly includes an input circuit 1', a transformer T1', an output circuit 2', and an optocoupler 3', and the input circuit 1' is connected to The input power supply Vin mainly has a switching transistor Q1' and a controller 11', and the transistor Q1' is connected to the primary side winding of the transformer T1', and the controller 11' can be used for PWM control, and the output terminal is connected to the transistor Q1', And the input terminal FB is ...

AI Technical Summary

Problems solved by technology

[0005] Although the above-mentioned circuit has the most concise components, because the controller 51' does not directly sense the output voltage, it directly depends on the characteristic sensing control of the transformer T2', and the feedback voltage is discontinuous, resulting in the stability and reliability of the circuit system. Poor, no-load output voltage stability is poor, dynamic voltage regulation performance is poor and missing

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