CN201402714Y - Transformer magnetic core and direct current-alternating current inverter applying thereof - Google Patents
Transformer magnetic core and direct current-alternating current inverter applying thereof Download PDFInfo
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- CN201402714Y CN201402714Y CN2009200216195U CN200920021619U CN201402714Y CN 201402714 Y CN201402714 Y CN 201402714Y CN 2009200216195 U CN2009200216195 U CN 2009200216195U CN 200920021619 U CN200920021619 U CN 200920021619U CN 201402714 Y CN201402714 Y CN 201402714Y
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Abstract
The utility model discloses a transformer magnetic core, comprising a magnetic core part with the shape like a Chinese character 'ri' and a straight column type magnetic core part which are connectedin a cross manner to form a structure with the shape like a Chinese character 'tian'; a primary winding and a secondary winding are respectively wound on a skeleton containing the straight column typemagnetic core. Therefore, the magnetic core part with the shape like a Chinese character 'ri' and the straight column type magnetic core part also add a branch magnetic circuit on the basis of the original main magnetic circuit, thus weakening the coupling degree of the primary winding and the secondary winding of the transformer and increasing the leakage inductance of the transformer. The utility model also discloses a direct current-alternating current inverter adopting the transformer magnetic core structure; the inverter can supply power for a fluorescent lamp tube in a quasi-resonant working manner by leakage inductance of the transformer and parasitic capacitance in the lamp tube and the circuit, thus effectively reducing the switching loss of an MOS tube in the circuit of the direct current-alternating current inverter.
Description
Technical field
The utility model relates to a kind of magnetic core, more specifically, relates to a kind of magnetic core of the transformer that is used for DC-AC inverter and the DC-AC inverter of using this magnetic core.
Background technology
LCD (LCD) is a display unit commonly used in the electronic products such as LCD TV, notebook computer, GPS display, video telephone.In LCD display, the LCD panel is actually the light valve that an electronics is controlled.In order to produce visual image, need add backlight to the LCD panel.
Present most of LCD backlight uses cathode fluorescent tube (CCFL) or external electrode fluorescence lamp pipe (EEFL).The fluorescent tube length of fluorescent tube is generally tens centimetres to tens centimetres, and has multiple shapes such as straight tube shape, circular arc, U-shaped and right angle (L) shape.Wherein, large-sized LCD display needs a plurality of fluorescent tubes backlight side by side usually.
As the fluorescent tube of backlight, its operating frequency between 40kHz～70kHz, need drive with sinusoidal ac usually.Owing in the back lighting of LCD, adopt the direct current supply of 3～28V usually, so, adopt DC-AC inverter (INVERTER) circuit that fluorescent tube is powered usually for the driving fluorescent lamp pipe.Described DC-AC inverter is in order to meet the operating characteristic of fluorescent tube, and DC low-voltage is become the electronic installation of high-frequency and high-voltage alternating current, also is called inverter for short.The DC-AC inverter output must have a high-frequency step-up transformer, and coming provides sufficiently high triggering and operating voltage for fluorescent tube.
DC-AC inverter circuit to the fluorescent tube power supply generally includes controller, the metal-oxide-semiconductor circuit, and transformer and DC power supply, wherein the metal-oxide-semiconductor circuit can adopt Royer circuit, full-bridge circuit, half-bridge circuit and push-pull circuit.
When powering for fluorescent tube, adopt the working method of quasi-resonance, can effectively reduce the switching loss of metal-oxide-semiconductor in the DC-AC inverter circuit.This quasi-resonance is to be undertaken by the parasitic capacitance in the leakage inductance of transformer in the inverter and fluorescent tube and the circuit.Because this parasitic capacitance is smaller, so need the former limit of transformer in the inverter to have bigger leakage inductance.
Shown in Figure 1 is the core structure of the transformer of DC-AC inverter in the prior art, and the arrow among the figure has been indicated the closed-loop path of the magnetic line of force in the magnetic core.The structure of two E types of transformer adopting of the prior art magnetic core butt joint is twined elementary winding and secondary winding respectively on the newel of two E shape magnetic cores.In this structure, mainly the dead slot number on the skeleton changes the leakage inductance of transformer between the air gap by adjusting magnetic core of transformer or elementary winding and the secondary winding.
The subject matter that magnetic core of transformer of the prior art exists is: the leakage inductance of generation is big inadequately, though it is as described above, can be by the air gap of adjusting magnetic core of transformer or the leakage inductance that the dead slot number between elementary winding and the secondary winding changes transformer, but above two kinds of methods are less to the change of leakage inductance, can not make leakage inductance sufficiently large.Also can obtain bigger leakage inductance, but both waste material of this mode also can bring the too high problem of transformer temperature rise by increasing the winding number of turns widely.Thereby, need a kind of improved magnetic core of transformer structure, its compared to existing technology, can be under the prerequisite that does not increase the winding number of turns leakage inductance of bigger increase transformer.
The utility model content
A purpose of the present utility model provides a kind of improved magnetic core of transformer, and the structure of this magnetic core can increase transformer leakage inductance.
For addressing the above problem, the utility model by the following technical solutions:
Described magnetic core of transformer comprises " a saying " font magnetic core component and a right cylinder type magnetic core component, described right cylinder type magnetic core component intersects with " saying " font magnetic core component and links to each other, form a sphere of movements for the elephants type structure, elementary winding and secondary winding are wound in respectively on the skeleton that comprises right cylinder type magnetic core.Like this, " saying " font magnetic core component and right cylinder type magnetic core component have increased branch's magnetic circuit again on the basis of original main magnetic circuit, thereby have weakened the degree of coupling of transformer primary and secondary winding, thereby have increased the leakage inductance of transformer.
Another purpose of the present utility model provides a kind of improved DC-AC inverter, and this inverter is used to the fluorescent tube power supply as the LCD display backlight.
Described DC-AC inverter circuit comprises controller, the metal-oxide-semiconductor circuit, and transformer and DC power supply, wherein transformer comprises above-mentioned improved magnetic core of transformer.Utilize this core structure, increased the leakage inductance of transformer.Thereby, when powering, can adopt the working method of quasi-resonance by the leakage inductance of transformer in the inverter and the parasitic capacitance in fluorescent tube and the circuit, thereby effectively reduce the switching loss of metal-oxide-semiconductor in the DC-AC inverter circuit for fluorescent tube.Metal-oxide-semiconductor circuit in the above-mentioned inverter can be Royer circuit, full-bridge circuit, half-bridge circuit and push-pull circuit.
The utility model has increased branch's magnetic circuit again on the basis of original main magnetic circuit direction of magnetic core of transformer.Thereby than magnetic core of transformer of the prior art, magnetic core of transformer structure of the present utility model significantly increases the leakage inductance of transformer in the inverter reducing the Transformer Winding number of turns and reducing under the prerequisite of transformer temperature rise.Under the situation that transformer leakage inductance improves, DC-AC inverter of the present utility model can be by the leakage inductance of described transformer and the parasitic capacitance in fluorescent tube and the circuit, working method with quasi-resonance is the fluorescent tube power supply, thereby has effectively reduced the switching loss of metal-oxide-semiconductor in the DC-AC inverter circuit.
Description of drawings
Fig. 1 is the core structure of the transformer of DC-AC inverter in the prior art;
Fig. 2 is the magnetic core of transformer structure of the utility model preferred embodiment.
Embodiment
In order to make those skilled in the art person understand the utility model scheme better, and above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, the utility model is described in further detail below in conjunction with embodiment and embodiment accompanying drawing.
The magnetic core of transformer structure that shown in Figure 2 is as the utility model preferred embodiment.Different with the structure of two E type magnetic cores butt joint among Fig. 1, magnetic core of transformer of the present utility model comprises " a saying " font magnetic core component and right cylinder type magnetic core component as shown in phantom in FIG., described right cylinder type magnetic core component and " saying " font magnetic core component intersect, form a sphere of movements for the elephants type structure, elementary winding and secondary winding are wound in the two ends of the skeleton that comprises right cylinder type magnetic core respectively.The loop of the magnetic line of force is shown in the arrow among Fig. 2 in the magnetic core of transformer like this, and it is different with flux loop among Fig. 1, is equivalent to increase again outside the main magnetic circuit direction branch's magnetic circuit.This has weakened the degree of coupling of transformer primary and secondary winding, thereby has increased leakage inductance.With EE22 type magnetic core is example, and by present solution, leakage inductance approximately can accomplish about 400mH, and adopts core structure of the present utility model approximately can accomplish 1H.
Compared with prior art, magnetic core of transformer structure of the present utility model can significantly increase the leakage inductance of transformer in the inverter reducing the Transformer Winding number of turns and reducing under the prerequisite of transformer temperature rise.
The magnetic core of transformer structure of the utility model preferred embodiment can be used for the DC-AC inverter of powering to as the fluorescent tube of LCD backlight.This DC-AC inverter circuit to the fluorescent tube power supply comprises controller, the metal-oxide-semiconductor circuit, and transformer and DC power supply, wherein transformer comprises the core structure of the utility model preferred embodiment.Utilize this core structure, increased the leakage inductance of transformer, thereby when powering for fluorescent tube, can be by the leakage inductance of transformer in the inverter and the parasitic capacitance in fluorescent tube and the circuit, adopt the working method of quasi-resonance, thereby effectively reduce the switching loss of metal-oxide-semiconductor in the DC-AC inverter circuit.Metal-oxide-semiconductor circuit in the inverter can adopt the form of Royer circuit, full-bridge circuit, half-bridge circuit and push-pull circuit.
The above only is an embodiment of the present utility model, and the utility model can also be applied in other liquid crystal display, as multiple point touching system for TV set, computer system, man-machine games system, cell phone system etc.Protection range of the present utility model is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the utility model discloses, and the variation that can expect easily or replacement all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range that claim was defined.
Claims (10)
1. a magnetic core of transformer is characterized in that, comprising: " a saying " font magnetic core component and a right cylinder type magnetic core component; Described right cylinder type magnetic core component intersects with described " saying " font magnetic core component and links to each other, and forms a sphere of movements for the elephants type structure.
2. magnetic core of transformer according to claim 1 is characterized in that, the elementary winding and the secondary winding of transformer are wound in respectively on the skeleton that comprises right cylinder type magnetic core.
3. magnetic core of transformer according to claim 1 and 2 is characterized in that described magnetic core of transformer is used for the transformer of DC-AC inverter.
4. a DC-AC inverter comprises controller, the metal-oxide-semiconductor circuit, and transformer and DC power supply is characterized in that, the magnetic core of described transformer comprises " a saying " font magnetic core component and a right cylinder type magnetic core component; Described right cylinder type magnetic core component intersects with described " saying " font magnetic core component and links to each other, and forms a sphere of movements for the elephants type structure.
5. DC-AC inverter according to claim 4 is characterized in that, the elementary winding and the secondary winding of described transformer are wound in respectively on the skeleton that comprises right cylinder type magnetic core.
6. according to claim 4 or 5 described DC-AC inverters, it is characterized in that described metal-oxide-semiconductor circuit is the Royer circuit.
7. according to claim 4 or 5 described DC-AC inverters, it is characterized in that described metal-oxide-semiconductor circuit is a full-bridge circuit.
8. according to claim 4 or 5 described DC-AC inverters, it is characterized in that described metal-oxide-semiconductor circuit is a half-bridge circuit.
9. according to claim 4 or 5 described DC-AC inverters, it is characterized in that described metal-oxide-semiconductor circuit is a push-pull circuit.
10. according to claim 4 or 5 described DC-AC inverters, it is characterized in that described DC-AC inverter is used for the fluorescent tube power supply as the LCD display backlight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200216195U CN201402714Y (en) | 2009-04-23 | 2009-04-23 | Transformer magnetic core and direct current-alternating current inverter applying thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200216195U CN201402714Y (en) | 2009-04-23 | 2009-04-23 | Transformer magnetic core and direct current-alternating current inverter applying thereof |
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| Publication Number | Publication Date |
|---|---|
| CN201402714Y true CN201402714Y (en) | 2010-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200216195U Expired - Fee Related CN201402714Y (en) | 2009-04-23 | 2009-04-23 | Transformer magnetic core and direct current-alternating current inverter applying thereof |
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| CN (1) | CN201402714Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107707125A (en) * | 2017-10-20 | 2018-02-16 | 四川莱福德科技有限公司 | Drive circuit and bridge-type resonance circuit |
| CN107993812A (en) * | 2017-12-27 | 2018-05-04 | 河北正电器科技有限公司 | Flat surface transformer |
| CN108899182A (en) * | 2018-04-15 | 2018-11-27 | 珠海市富源电子有限公司 | High voltage short circuit protects transformer |
-
2009
- 2009-04-23 CN CN2009200216195U patent/CN201402714Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107707125A (en) * | 2017-10-20 | 2018-02-16 | 四川莱福德科技有限公司 | Drive circuit and bridge-type resonance circuit |
| CN107993812A (en) * | 2017-12-27 | 2018-05-04 | 河北正电器科技有限公司 | Flat surface transformer |
| CN107993812B (en) * | 2017-12-27 | 2019-12-03 | 河北正一电器科技有限公司 | Flat surface transformer |
| CN108899182A (en) * | 2018-04-15 | 2018-11-27 | 珠海市富源电子有限公司 | High voltage short circuit protects transformer |
| CN108899182B (en) * | 2018-04-15 | 2021-01-05 | 珠海市富源电子有限公司 | High-voltage short-circuit protection transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100210 Termination date: 20120423 |