CN202512999U - Fixed inductor core used for LED drive circuit - Google Patents
Fixed inductor core used for LED drive circuit Download PDFInfo
- Publication number
- CN202512999U CN202512999U CN2012200568891U CN201220056889U CN202512999U CN 202512999 U CN202512999 U CN 202512999U CN 2012200568891 U CN2012200568891 U CN 2012200568891U CN 201220056889 U CN201220056889 U CN 201220056889U CN 202512999 U CN202512999 U CN 202512999U
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- China
- Prior art keywords
- magnet
- core
- ferrite
- magnetic
- fixed inductor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a fixed inductor core used for an LED drive circuit. The fixed inductor core used for an LED drive circuit is characterized by comprising a T-shaped ferrite magnetic core (1), a U-shaped ferrite magnetic core (2) and a magnetized cuboid permanent ferrite magnet (3). The permanent ferrite magnet is positioned between the top of the T-shaped ferrite magnetic core and the inner bottom surface of the U-shaped ferrite magnetic core, and the direction of the magnetic field of the permanent ferrite magnet generated in the T-shaped ferrite magnetic core is opposite to the direction of the magnetic field generated by the direct current in a winding. Part of the magnetic field generated by the direct current in the fixed inductor winding is counteracted by the magnetic field generated by the permanent ferrite magnet, according to the utility model, the DC superposition characteristic of the fixed inductor is substantially raised, and a larger DC is allowed passing through the fixed inductor.
Description
Technical field
The utility model relates to a kind of ferrite core, relates in particular to a kind of fixed inductance magnetic core that is used for led drive circuit.
Background technology
At present; Generally use ferrite core as fixed inductance in the led drive circuit,, require electronic devices and components constantly to develop to miniaturization and high power direction along with the develop rapidly of LED electronic technology; In order to satisfy this growth requirement; The direct current that requires fixed inductance to allow to pass through is increasing, and this tends to cause the decline significantly of fixed inductance winding inductance, thereby makes the fixed inductance can't operate as normal.For preventing the generation of magnetic saturation phenomenon, must improve the dc superposition characteristic of fixed inductance, traditional method is in the magnetic circuit of magnetic core, to open one section air gap; Perhaps simply make ferrite core become open-flux path, although this method can be improved the dc superposition characteristic of fixed inductance to a certain extent, improved degree is very limited; Especially for the ferrite core that is operated under the high frequency condition, often adopt the NiZn Ferrite Material, and the NiZn Ferrite Material is because saturation flux density is lower; Be easy to occur saturation magnetization; Thereby the fixed inductance winding inductance is sharply descended, and this can make the electronic equipment can't operate as normal, even burns.Therefore,, only adopt open-flux path, can't improve the dc superposition characteristic of fixed inductance greatly for being operated in fixed inductance with big direct-current component.
The utility model content
The utility model technical problem to be solved is the deficiency that overcomes prior art, provides a kind of led drive circuit that can be applied to have than big direct-current component to use the fixed inductance magnetic core.
The technical scheme that the utility model adopted is: the utility model comprises a T shape ferrite core and a U-iron oxysome magnetic core; Between the inner bottom surface of the top of T shape ferrite core and U-iron oxysome magnetic core; Place a cuboid permanent-magnet ferrite magnet that has magnetized, direct current is opposite at the magnetic direction that T shape ferrite magnetic is produced in the heart in magnetic field that this permanent-magnet ferrite magnet is produced and the winding.
The beneficial effect of the utility model is: because direct current is opposite at the magnetic direction that T shape ferrite magnetic is produced in the heart in magnetic field that the permanent-magnet ferrite magnet is produced and the winding.Therefore, some is offset the magnetic field that direct current produced in the fixed inductance winding by the magnetic field that the permanent-magnet ferrite sheet is produced, thereby can make in the fixed inductance winding through bigger direct current.Through the utility model method, can improve the dc superposition characteristic of fixed inductance greatly, fixed inductance 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 a kind of fixed inductance core const ruction sketch map that is used for led drive circuit.
Embodiment
In Fig. 1; Comprise a T shape ferrite core 1; A U-iron oxysome magnetic core 2, and a cuboid permanent-magnet ferrite magnet 3 that has magnetized, direct current is opposite at the magnetic direction that T shape ferrite magnetic is produced in the heart in magnetic field that this permanent-magnet ferrite magnet is produced and the winding.
Because some is offset the magnetic field that direct current produced in the fixed inductance winding by the magnetic field that the permanent-magnet ferrite magnetic core is produced, and can pass through bigger direct current thereby can make in the fixed inductor winding.Through the utility model method, can improve the dc superposition characteristic of fixed inductance greatly, fixed inductance can be allowed through bigger direct current.
Claims (1)
1. fixed inductance magnetic core that is used for led drive circuit; It is characterized in that: comprise a T shape ferrite core (1); A U-iron oxysome magnetic core (2); And a cuboid permanent-magnet ferrite magnet (3) that has magnetized, this permanent-magnet ferrite magnet is between the inner bottom surface of the top of T shape ferrite core and U-iron oxysome magnetic core, and the permanent-magnet ferrite magnet magnetic direction that direct current produced in magnetic field that T shape ferrite magnetic is produced in the heart and winding is opposite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200568891U CN202512999U (en) | 2012-02-22 | 2012-02-22 | Fixed inductor core used for LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200568891U CN202512999U (en) | 2012-02-22 | 2012-02-22 | Fixed inductor core used for LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202512999U true CN202512999U (en) | 2012-10-31 |
Family
ID=47065463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200568891U Expired - Fee Related CN202512999U (en) | 2012-02-22 | 2012-02-22 | Fixed inductor core used for LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202512999U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102568768A (en) * | 2012-02-22 | 2012-07-11 | 临沂中瑞电子有限公司 | Fixed inductance magnetic core for LED (light emitting diode) |
-
2012
- 2012-02-22 CN CN2012200568891U patent/CN202512999U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102568768A (en) * | 2012-02-22 | 2012-07-11 | 临沂中瑞电子有限公司 | Fixed inductance magnetic core for LED (light emitting diode) |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121031 Termination date: 20180222 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |