One-time side control switching power regulator

Abstract

The invention relates to a power supply regulator of switching over type controlled by primary side, which consists of a transformer with primary side winding and an auxiliary winding being separately coupled to positive and negative electric rails, a switch being series-connected to two said windings, a control circuit coupled to switch and auxiliary winding, a supply capacity for providing power to control circuit, a dipolar body coupled to negative rail and supply capacity. The auxiliary winding comprises a leakage inductance for releasing stored energy to supply capacity through diode when switch is off and for storing energy when switch is on. The setting method between the transformer and the switch in the invention can improve the efficiency of the switching over type power supply regulator and reduce the electromagnetic interference.

Description

Technical field: [0001] The invention relates to a power regulator, in particular to a switching power regulator controlled by the primary side. Background technique: [0002] By the way, switching power regulators have been widely used to provide adjustable voltage and current. At present, the focus of research on power regulators is how to make power regulators more efficient to save power. A switch mode power regulator usually includes a control circuit, a switch and a transformer. The control circuit is used to sense the output voltage and / or output current of the switch mode power regulator, and generate a control signal to control the switching and adjustment switching of the switch The output voltage and / or output current of the type power regulator. [0003] see figure 1 , is a circuit diagram of a conventional switching power regulator. As shown in the figure, a conventional switching power supply regulator includes a transformer 10, which includes a primary side...

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