Single end driver transformer

A technology for transformers and flyback transformers, applied in the fields of transformer/inductor magnetic core, inductor/transformer/magnet manufacturing, electrical components, etc., can solve the problems of large size and high cost of flyback transformers, reduce residual magnetic induction, reduce Weight, the effect of reducing product cost

Inactive Publication Date: 2008-08-27
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Take the flyback transformer as an example. Its working mode is single-ended anti-excitation. Due to the limitation of the input power of CRT (cathode ray tube), the traditional FBT magnetic core volume should not be too small. For example: 29” TV c

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1

[0032] Such as figure 2 Shown is the output transformer magnetic core of the switching power supply, the magnetic core 1 is made of soft magnetic material, and the excitation method is single-ended reverse excitation. In this example, the shape of the magnetic core 1 is "EI" type, there are three air gaps 2 in the magnetic circuit, and the permanent magnets 3 are installed on both sides of the magnetic core 1 close to the air gap 2. In this example, a permanent magnet 3 is installed on one side of the magnetic core 1 and the air gap 2. According to the test, this installation method can achieve better results-under the same conditions (the initial permeability of the magnetic core μ 0 , Cross-sectional area S, transformer winding turns N, etc.) can obtain a larger magnetizing inductance L. The magnetic pole of the permanent magnet 3 should be selected so that the direction of the magnetic field in the magnetic core 1 is opposite to the direction of the magnetic...

Example Embodiment

[0033] Example 2

[0034] This example is a "UI" type magnetic core, such as image 3 Shown. The magnetic core has two air gaps 2. In this example, a permanent magnet 3 is installed in each of the two air gaps. The polarity of the two permanent magnets should be opposite to the direction of the magnetic field when the magnetic core 1 works.

Example Embodiment

[0035] Example 3

[0036] The transformer in this example is a flyback transformer with a core shape like Figure 4 Shown. The magnetic core of the flyback transformer has two air gaps. The transformer winding is mounted on one air gap 2 of the magnetic core 1, and the other air gap 2 is outside the winding. The permanent magnet 3 is pasted by the adhesive beside the air gap, such as Figure 5 Shown. Figure 5 The arrow 10 is the direction of the excitation magnetic field when the flyback transformer is working, and the arrow 30 is the direction of the magnetic field of the permanent magnet 3 in the core 1. The two permanent magnets in this example are installed on one side of the magnetic core 1 and on both sides of the air gap 2. The polarities of the two permanent magnets 2 are opposite, and the magnetic field generated by them is opposite to the magnetic field when the magnetic core 1 is working.

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Abstract

The invention relates to a pulse transformer, in particular to a pulse transformer magnetic core. The invention discloses the pulse transformer magnetic core which can further reduce the volume of the magnetic core and reduce the cost. The invention adopts the technical proposal that: the single ended driver transformer comprises the magnetic core. The invention is characterized in that: a permanent magnet is arranged inside the magnetic core, and the magnetic field direction of the permanent magnet in the magnetic core is opposite to the magnetic field direction of the magnetic core when the magnetic core is operated. The pulse transformer magnetic core has the advantages that: the remanent magnetic induction and the coercive force of the magnetic core can be reduced; high magnetic induction increment and high pulse magnetic conductivity can be obtained under the pulse state; the volume of the magnetic core and the pulse transformer can be reduced under the same output power and output voltage; the weight is lightened; the product cost is reduced.

Description

technical field [0001] The invention relates to a pulse transformer, in particular to a pulse transformer magnetic core. Background technique [0002] Pulse transformers are divided into single-ended excitation transformers and double-ended (push-pull) excitation transformers according to their driving methods. When the single-ended excitation transformer is working, the magnetic core is excited in one direction, and the direction of the magnetic field in the magnetic core does not change. In order to improve the electromagnetic parameters of the pulse transformer magnetic core and to facilitate the assembly of coil windings, air gaps are generally provided in the magnetic core, and most magnetic cores have 2 to 3 air gaps. [0003] Based on the need to reduce the cost of electronic products and the development trend of miniaturization, higher and higher requirements are put forward for the miniaturization of electronic components. Pulse transformers, especially power puls...

Claims

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Application Information

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IPC IPC(8): H01F27/24H01F41/02
Inventor 张雄杨森林任云强张耐久
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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