CN202513002U

CN202513002U - Transformer core for LEDs (light-emitting diode)

Info

Publication number: CN202513002U
Application number: CN201220056924XU
Authority: CN
Inventors: 陆明岳
Original assignee: LINYI ZHONGRUI ELECTRONICS CO Ltd
Current assignee: LINYI ZHONGRUI ELECTRONICS CO Ltd
Priority date: 2012-02-22
Filing date: 2012-02-22
Publication date: 2012-10-31
Anticipated expiration: 2022-02-22

Abstract

The utility model discloses a transformer core for LEDs. The transformer core is characterized in that: the transformer core comprises two E-shaped ferrite cores (1), a magnetized cuboid permanent-magnetic ferrite magnet (2) and a cuboid permanent-magnetic ferrite magnet (3) are respectively placed between the butted surfaces of the two butted side limbs of the two E-shaped ferrite cores (1), the directions of the magnetic fields generated in the central limbs of the E-shaped ferrite cores by the two permanent-magnetic ferrite magnets are the same, and moreover, the directions of the magnetic fields generated by the two permanent-magnetic ferrite magnets are opposite from the direction of the magnetic field generated by the direct current in the winding of the central limbs. Because part of the magnetic field generated by the direct current in the winding of the central limbs is counteracted by the magnetic fields generated by the permanent-magnetic ferrite cores, the transformer core can greatly enhance the direct-current superposition characteristic of a transformer, so that the transformer can allow the passage of higher direct current.

Description

A kind of LED transformer magnetic core that is used for

Technical field

The utility model relates to a kind of ferrite core, relates in particular to a kind of LED of being used for transformer magnetic core.

Background technology

At present; Generally use ferrite core as transformer in the LED power driving circuit,, require electronic devices and components constantly to develop to miniaturization and high power direction along with the develop rapidly of electronic technology; In order to satisfy this growth requirement; The direct current that requires transformer to allow to pass through is increasing, and this tends to cause the decline significantly of Transformer Winding inductance, thereby makes the transformer can't operate as normal.For preventing the generation of magnetic saturation phenomenon; Must improve the dc superposition characteristic of transformer; Traditional method is in the magnetic circuit of magnetic core, to open one section air gap, although this method can be improved the dc superposition characteristic of transformer to a certain extent, improved degree is very limited.For being operated in transformer with big direct-current component, can't adopt this method, because; Air gap in the ferrite core magnetic circuit can not be opened very greatly, otherwise; Inductance is very low, and leakage field is very big, can produce certain electromagnetic to other electronic devices and components and disturb.

The utility model content

The utility model technical problem to be solved is the deficiency that overcomes prior art, provides a kind of LED power driving circuit that can be applied to have than big direct-current component to use transformer.

The technical scheme that the utility model adopted is: the utility model comprises two ferrite 'E' cores of butt joint each other, and two limit legs of E shape magnetic core respectively grind off a part; Perhaps E shape magnetic core is when mould designs, and makes the height of both sides leg be lower than the height of newel, adopts this mode, saved mill processing, can save cost greatly.When two E shape magnetic core butt joints; Between two limit leg interfaces of E shape magnetic core, respectively place a rectangular-shaped permanent-magnet ferrite magnet that has magnetized; The magnetic direction that these two permanent-magnet ferrite magnets produce in the newel of the ferrite 'E' core of butt joint is identical, and the magnetic direction that direct current produced in magnetic direction that it produced and the newel winding is opposite.

The beneficial effect of the utility model is: because the magnetic direction that direct current produced in magnetic direction that these two permanent-magnet ferrite magnets produce in two ferrite 'E' core newels of butt joint and the newel winding is opposite; Therefore; Some is offset the magnetic field that direct current produced in the newel winding by the magnetic field that the permanent-magnet ferrite magnet is produced, thereby can make in the Transformer Winding through bigger direct current.Through the utility model method, can improve the dc superposition characteristic of transformer greatly, transformer can be allowed through bigger direct current.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Fig. 1 is that two E shape magnetic cores become the ferrite core structural representation with two permanent-magnet ferrite magnet combination.

Embodiment

In Fig. 1; Two ferrite 'E' cores 1; Between the interface of two limit legs that it docks each other; Each places a rectangular-shaped permanent-magnet ferrite magnet that has magnetized 2 and rectangular-shaped permanent-magnet ferrite magnet 3, and the magnetic direction that these two permanent-magnet ferrite magnets are produced in the ferrite 'E' core newel is identical, and the magnetic direction that direct current produced in magnetic direction that it produced and the newel winding is opposite.Because some is offset the magnetic field that direct current produced in the newel winding by the magnetic field that the permanent-magnet ferrite magnet is produced, thereby can make in the newel winding through bigger direct current.Through the utility model method, can improve the dc superposition characteristic of transformer greatly, transformer can be allowed through bigger direct current.

Claims

1. one kind is used for LED transformer magnetic core; It is characterized in that: comprise two ferrite 'E' cores (1); Between the faying face that its two limit legs dock each other; Each places a rectangular-shaped permanent-magnet ferrite magnet (2) that has magnetized and rectangular-shaped permanent-magnet ferrite magnet (3), and the magnetic direction that these two permanent-magnet ferrite magnets produce in the ferrite 'E' core newel is identical, and the magnetic direction that direct current produced in magnetic direction that it produced and the newel winding is opposite.