A Feedback Winding Multiplexing Circuit of High Frequency Transformer

Abstract

The invention provides a feedback winding multiplex circuit for a high-frequency transformer, and relates to the technical field of an electronic circuit and the switching power supply field. The feedback winding multiplex circuit for a high-frequency transformer includes a high-frequency transformer, an absorption freewheeling circuit, a function multiplex circuit and a charging and overvoltage protection circuit, wherein a base pin 1 of the high-frequency transformer is connected with the absorption freewheeling circuit; the absorption freewheeling circuit is connected with the cathode of a diode D6; a base pin 2 of the high-frequency transformer is connected with the absorption freewheeling circuit and an external MOS tube; a base pin 5 of the high-frequency transformer and a base pin 6 of the high-frequency transformer are connected with the function multiplex circuit; and the function multiplex circuit is connected with an external power supply after connecting with the charging and overvoltage protection circuit. The feedback winding multiplex circuit for a high-frequency transformer can multiplex one channel of the same skeleton as different functions, and can satisfy the requirement of the circuit power supply on the premise of unchanging the skeleton. Besides, construction of the circuit is simple and reliable and the occupied area of a PCB is relatively smaller, so that the requirement for miniaturization the switching power supply is satisfied.

Description

technical field [0001] The invention relates to the technical field of electronic circuits and the field of switching power supplies, in particular to a feedback winding multiplexing circuit of a high-frequency transformer. Background technique [0002] At present, the general direction of switching power supply can be summarized as the following points [0003] (1) Miniaturization, thinning and lightening. The volume and weight of a switching power supply are mainly determined by the energy storage components, so the miniaturization of the switching power supply is actually to reduce the volume of the energy storage components as much as possible. [0004] (2) High frequency. Within a certain range, the increase of switching frequency can effectively suppress interference and improve the dynamic performance of the system, so high frequency is the main development direction of switching power supply. [0005] (3) High reliability. Switching power supplies use tens of tim...

AI Technical Summary

Problems solved by technology

[0008] In the current technology, if the number of channels is not enough on the existing skeleton, the only option is to modify the size of the skeleton to increase the number of pins of the skeleton, thus virtually increasing the size of the transformer

The increase of the transformer leads to a waste of space for the entire switching power supply and increases the area of ​​the PCB.

It violates the development direction of the miniaturization of switching power supplies, and at the same time greatly increases the research and development costs

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