High-frequency pulse current transformer

Abstract

The invention relates to a pulse current transformer used for switching power supply, which comprises one or a plurality of units which are basically identical. Each unit comprises an open circuit magnetic core and a closed magnetic circuit armature formed by being matched with the open circuit magnetic core. The pulse current transformer is characterized in that a winding is coiled on the magnetic core, a signal output pin is arranged on the magnetic core, and a metal conducting strip is arranged between the magnetic core and the armature. The signal winding is coiled on the open circuit magnetic core so as to faciliate the mechanical coiling, and then the armature is covered on the magnetic core to form a magnetic flux circuit, increase the inductance value of the transformer, reduce the leakage inductance, and reduce the interference of the external magnetic field to the transformer. The metal conducting strip is connected with the circuit of the sampled current, therefore, sampled current signals pass through the space between the magnetic core and the armature, current signals are induced on the winding, and the induced signals are output by the signal output pin. As no framework is required, the pulse current transformer is easy to be processed, and the production cost is low.

Description

technical field [0001] The invention relates to a pulse current transformer used in a switching power supply. Background technique [0002] High-frequency pulse current transformers are widely used in switching power supplies, and are generally used to detect switching frequency pulse currents as control, drive or protection signals. Commonly used pulse current transformers use toroidal cores or magnetic cores with skeletons, and the signal windings are wound on the magnetic rings or on the skeletons, and the sampled current signals pass through the magnetic rings or wind several turns on the skeletons. . In this way, the required pulse current signal can be obtained on the signal winding. [0003] Such an implementation method is relatively complicated, especially when a magnetic ring is used as a transformer. When the number of turns of the signal winding of the transformer reaches hundreds of turns, manual winding is required, and the cost is very high. When the bobbin...

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly aims to solve the problems of complex manufacturing process and high cost of existing current transformers, and proposes a pulse current transformer with a simple structure, aiming at simplifying the manufacturing procedure and reducing the manufacturing cost

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