CN201611607U - Transformer structure - Google Patents

Abstract

The utility model provides a transformer structure belongs to electron technical field. The transformer structure comprises a winding unit, a rectangular iron core, a low-voltage winding group and a high-voltage winding group; the winding unit comprises a first winding frame, a second winding frame and a third winding frame, wherein two ends of the first winding frame and the second winding frame are respectively provided with a low-voltage partition plate, and the outer side of the third winding frame is provided with a plurality of high-voltage partition plates; the B-shaped iron core is used for forming a magnetic flux path; the low-voltage winding group is arranged between the two low-voltage clapboards and surrounds the first winding frame and the second winding frame to form a primary side; the high-voltage winding group is arranged among the high-voltage clapboards and surrounds the third winding frame to form a secondary side. Therefore, the transformer structure of the utility model can generate a large amount of leakage inductance on the secondary side for driving other electronic components; and the structure is simple, the cost is low, and the application is convenient.

Description

A Transformer Structure

technical field

The utility model relates to the field of electronic technology, in particular to a transformer structure.

Background technique

In recent years, traditional cathode ray tube displays (commonly known as CRT (Cathode Ray Tube, cathode ray tube) displays) have been gradually replaced by liquid crystal displays. The main reason is that the amount of radiation emitted by liquid crystal displays is much smaller than that of CRT displays. In addition, the manufacturing cost of liquid crystal displays has been significantly reduced in recent years, which is why liquid crystal displays have gradually become the mainstream of the TV or computer screen market.

Generally speaking, a liquid crystal display includes a backlight module and a liquid crystal panel. The main function of the backlight module is to provide a backlight for the liquid crystal panel. In products with large screens, in order to obtain sufficient brightness for the LCD panel, generally speaking, the "direct type backlight module" is the main application. The so-called "direct type" refers to setting a plurality of cold cathode fluorescent lamps (Coldcathode fluorescent lamp, CCFL) directly under the backlight module. Among them, the driving circuit of the cold cathode fluorescent lamp needs the help of the second-stage transformer and the resonant circuit to drive, but in order to make the luminance of multiple cold cathode fluorescent lamps more uniform after lighting, each cold cathode fluorescent lamp needs to be controlled by two Different second-stage transformers and their corresponding resonant circuits are lit; therefore, the more CCFL tubes are required, the more second-stage transformers and resonant circuits need to be provided. This means that the circuit structure of the direct-lit backlight module cannot be simplified, and its manufacturing cost and assembly man-hours cannot be reduced; therefore, there is inconvenience in application.

Utility model content

The main purpose of the embodiment of the utility model is to provide a transformer structure, which is used to drive the cold cathode fluorescent lamp driving circuit of a large-size liquid crystal display, so as to simplify the structure of the driving circuit, thereby reducing the manufacturing cost and assembly man-hour of the direct type backlight module .

In order to achieve the above purpose, the embodiment of the utility model provides a transformer structure, which includes a winding unit, a day-shaped iron core, a low-voltage winding group, a high-voltage winding group and a protective cover. Wherein, the winding unit includes a first winding frame, a second winding frame and a third winding frame, the first winding frame includes a first accommodating space, and the second winding frame Including a second accommodation space, the third winding frame includes a third accommodation space, the first winding frame and the two ends of the second winding frame are respectively provided with a low-voltage partition, the A plurality of high-voltage partitions are arranged on the outside of the third winding frame, and the first accommodating space communicates with the third accommodating space. The Japanese iron core is used to form a magnetic flux path, and includes a central magnetizer and two side column magnetizers, and the central magnetizer passes through the first accommodating space and the third accommodating space. One side column magnetizer of the Japanese-shaped iron core passes through the second accommodating space. The low-voltage winding group is arranged between two low-voltage partitions, and surrounds the first winding frame and the second winding frame to form a primary side. The high-voltage winding group is arranged between a plurality of high-voltage partitions, and surrounds the third winding frame to form a secondary side. The protective cover is used to cover the winding unit, the low-voltage winding group and the high-voltage winding group to isolate electrical interference. Therefore, the transformer structure of the embodiment of the present invention can generate a large amount of leakage inductance on the secondary side for driving other electronic components.

Further, in the above-mentioned transformer structure, the J-shaped iron core is formed by combining two E-shaped iron cores, and there is a gap between the central magnetizers of the two E-shaped iron cores.

Furthermore, in the above-mentioned transformer structure, wherein, the J-shaped iron core is composed of an E-shaped iron core and an I-shaped iron core, or is composed of a C-shaped iron core and a T-shaped iron core.

Furthermore, in the transformer structure as described above, when the protective cover and the winding unit are combined, they are tightly fitted and engaged with each other, or engaged through a tenon structure.

Furthermore, in the above-mentioned transformer structure, wherein, the central magnetic conductor and the first accommodating space or the third accommodating space are closely matched with each other.

Furthermore, in the transformer structure as described above, the side column magnetizer and the second accommodating space are closely matched with each other.

Therefore, the transformer structure described in the embodiment of the present invention can be used for driving the driving circuit of the cold cathode fluorescent lamp; and, because of its simple structure and low cost, it can simplify the circuit structure of the cold cathode fluorescent lamp of the large-size liquid crystal display, and can The manufacturing cost and assembly man-hours of the direct-lit backlight module are reduced, and the application is convenient.

Description of drawings

Fig. 1A is an exploded view of an embodiment of a transformer structure provided by the present invention;

Fig. 1B is a schematic diagram of an embodiment of a Japanese iron core provided by the utility model;

Fig. 1C is a top view of an embodiment of a transformer structure provided by the present invention;

Fig. 2 is a schematic diagram of another embodiment of a Japanese iron core provided by the utility model;

Fig. 3 is a schematic diagram of another embodiment of a Japanese iron core provided by the utility model;

Fig. 4 is an application schematic diagram of an embodiment of a transformer structure provided by the present invention.

Tr2, Tr21, Tr22: transformer structure; Ps: primary side; Ss: secondary side;

21: Japanese iron core; 21A: E-shaped iron core; 211: center magnetizer; 212: side column magnetizer; 22: winding unit; 221: first winding frame; 222: second winding frame; 223 : the third winding frame; 224: the first storage space; 225: the second storage space; 226: the third storage space; 227: low-voltage partition; 228: high-voltage partition; 23: protective cover; 25: Low-voltage winding group; 26: High-voltage winding group; 27: Gap;

31, 41: Japan-type iron core; 31A: E-type iron core; 31B: I-type iron core;

41A: C-shaped iron core; 41B: T-shaped iron core;

11: Power board; 111: Bridge rectifier; 112: Power factor corrector; 113: Half bridge/full bridge converter; 12: Balance board; 13: Backlight source; 131～13N: U-shaped cold cathode fluorescent tube;

Lk1, Lk2: resonant inductor; Cp1, Cp2: resonant capacitor; Cs1: first balance capacitor; Cs2: second balance capacitor; V1: first sine wave AC voltage; V2: second sine wave AC voltage.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the implementation of the present utility model will be further described in detail below in conjunction with the accompanying drawings.

Referring to Fig. 1A and Fig. 1B at the same time, Fig. 1A is an exploded view of an embodiment of a transformer structure provided by the utility model, and Fig. 1B is a schematic diagram of an embodiment of a Japanese-shaped iron core provided by the utility model. As shown in FIG. 1A , the transformer structure Tr2 includes a winding unit 22 , a protective cover 23 and a day-shaped iron core 21 formed by combining two E-shaped iron cores 21A. Wherein, the winding unit 22 includes a first winding frame 221, a second winding frame 222 and a third winding frame 223, the first winding frame 221 includes a first accommodating space 224, the The second winding frame 222 includes a second accommodating space 225 , and the third winding frame 223 includes a third accommodating space 226 . The two ends of the first winding frame 221 and the second winding frame 222 are respectively provided with a low-voltage partition 227, and the outside of the third winding frame 223 is provided with a plurality of high-voltage partitions 228. The space 224 communicates with the third accommodating space 226 . The Japanese-shaped iron core 21 (as shown in FIG. 1B ) formed by combining two E-shaped iron cores 21A is intended to form a magnetic flux path. Each E-shaped iron core 21A includes a central magnetizer 211 and two side column magnetizers 212; the central magnetizer 211 of the left E-shaped iron core 21A corresponds to the first accommodating space 224, and the left E-shaped iron core 21A One side column magnetizer 212 corresponds to the second accommodating space 225 . The central magnetizer 211 of the right E-shaped core 21A corresponds to the third accommodating space 226 . The purpose of the protective cover 23 is to isolate electrical interference and prevent the high voltage or electromagnetic waves of the transformer structure Tr2 from adversely affecting other electronic components.

Next, refer to Fig. 1C, and compare Fig. 1A-Fig. 1B at the same time; Fig. 1C is the top view of the embodiment of a kind of transformer structure provided by the utility model; Wherein, in order to highlight the main technical feature of this transformer structure Tr2, in The protective cover 23 is not shown in 1C. As shown in FIG. 1C , the transformer structure Tr2 also includes a low voltage winding set 25 and a high voltage winding set 26 . The low voltage winding group 25 is disposed between two low voltage partitions 227 and surrounds the first winding frame 221 and the second winding frame 222 to form a primary side (Ps). The high voltage winding group 26 is disposed between a plurality of high voltage partitions 228 and surrounds the third winding frame 223 to form a secondary side (Ss). Among them, the purpose of the high-voltage partition 228 and the low-voltage partition 227 is to avoid the mutual inductance between different pressure differences due to the influence of external factors (such as changes in air dielectric coefficient, changes in operating altitude, changes in air humidity, etc.). Electric short-arc discharge phenomenon. In addition, there is a gap 27 between the central magnetic conductors 211 of the two E-shaped iron cores 21A, so that the two central magnetic conductors 211 do not touch each other, so that the transformer structure Tr2 of the embodiment of the present invention has a larger leakage inductance effect .

Next, introduce the assembly method of the transformer structure Tr2 of the utility model embodiment; See Fig. 1A-1C at the same time, when assembling this transformer structure Tr2, need to use wire respectively in this first bobbin frame 221, the second winding wire respectively The frame 222 and the third bobbin frame 223 are wound with multiple turns to form the low voltage winding group 25 on the primary side (Ps) and the high voltage winding group 26 on the secondary side (Ss). After the wire has been wrapped around, the protective cover 23 covers the winding unit 22, the low-voltage winding group 25 and the high-voltage winding group 26 from top to bottom, so as to isolate its electrical interference; The E-shaped iron core 21A is inserted into the winding unit 22 from the left and right sides respectively, so that the central magnetizer 211 of the left E-shaped iron core 21A passes through the first accommodating space 224, and the left E-shaped iron core 21A in which One side column magnetizer 212 passes through the second accommodating space 225, and the central magnetizer 211 of the right E-shaped iron core 21A passes through the third accommodating space 226; when the two E-shaped iron cores 21A and the winding unit 22, the two central magnetizers 211 will be tightly matched with the first accommodating space 224 and the third accommodating space 226 respectively, and the side column magnetizers 212 will be in a state of tight fit with the second accommodating space 225 are closely matched with each other. In this way, the assembly of the transformer structure Tr2 can be completed. Therefore, the transformer structure Tr2 of the embodiment of the present invention can generate a large amount of leakage inductance on the secondary side (Ss) for driving other electronic components.

In other embodiments, as shown in FIG. 2 , the Japanese core 31 can also be composed of an E-shaped core 31A and an I-shaped core 31B. Alternatively, as shown in FIG. 3 , the Japanese-shaped iron core 41 can also be composed of a C-shaped iron core 41A and a T-shaped iron core 41B. In addition, when designing the structure of the protective cover 23, the protective cover 23 and the winding unit 22 can be tightly fitted and engaged with each other, or locked by a tenon structure (not shown), then when the protective cover When 23 is combined with the winding unit 22, it will not fall off due to loosening and sliding, which is convenient for the assembly and moving of the transformer structure Tr2.

Next, the application of the transformer structure of the embodiment of the present invention to drive a cold cathode fluorescent lamp driving circuit by using the large leakage inductance effect is introduced. Referring to Fig. 4, Fig. 4 is an application schematic diagram of an embodiment of a transformer structure provided by the utility model. As shown in Figure 4, a CCFL drive circuit is located on a power board 11 and a balance board 12 (balance board) for driving a backlight 13; and the backlight 13 includes a plurality of U-shaped cold cathodes Fluorescent tubes 131˜13N, where N is a natural number. On this power board 11, be provided with a bridge rectifier 111, a power factor corrector 112, half bridge/full bridge converter 113, a transformer structure Tr21, a transformer structure Tr22, a first resonant circuit (by a resonant inductor device Lk1 and a resonant capacitor Cp1) and a second resonant circuit (composed of a resonant inductor Lk2 and a resonant capacitor Cp2). A plurality of first balancing capacitors Cs1 and a plurality of second balancing capacitors Cs2 are provided on the balancing board 12 . In the embodiment of the present invention, the bridge rectifier 111 is used to receive AC mains and convert it into DC voltage. The power factor corrector 112 is coupled to the bridge rectifier 111 for modifying the distorted current waveform output by the bridge rectifier 111 to meet the harmonic current specification. The half-bridge/full-bridge converter 113 is coupled to the bridge rectifier 111 through the power factor corrector 112 for receiving the DC voltage output by the bridge rectifier 111 and converting it into a square wave AC voltage. Wherein, the wire winding method of the primary side (Ps) and the secondary side (Ss) of the transformer structure Tr21 is shown in FIG. 1C . Moreover, the ratio of the number of turns of the primary side (Ps) winding and the number of turns of the secondary side (Ss) winding of the transformer structure Tr21 is 1:n, where n represents the multiple of boosting voltage. In addition, the structure of the transformer structure Tr22 is similar to the structure of the transformer structure Tr21, so it will not be repeated here.

The primary side (Ps) of the transformer structure Tr21 and the primary side (Ps) of the transformer structure Tr22 are connected in series and across the output end of the half-bridge/full-bridge converter 113 for receiving square wave AC voltage. The secondary side (Ss) of the transformer structure Tr21 is coupled to the first resonant circuit; and the secondary side (Ss) of the transformer structure Tr22 is coupled to the second resonant circuit. Wherein, the resonant inductor Lk1 in the first resonant circuit can usually be provided by the leakage inductance of the secondary side (Ss) of the transformer structure Tr21, and the resonant inductor Lk2 in the second resonant circuit can usually be provided by the transformer structure Tr22 The leakage inductance of the secondary side (Ss) is provided. The transformer structure Tr21 boosts the voltage distributed on its primary side (Ps), and then outputs the first sinusoidal AC voltage V1 through the resonance of the first resonant circuit. The transformer structure Tr22 boosts the voltage distributed on its primary side (Ps), and then outputs the second sinusoidal AC voltage V2 through the resonance of the second resonant circuit. Since the secondary side (Ss) of the transformer structure Tr21 and the secondary side (Ss) of the transformer structure Tr22 have opposite polarities, the first sinusoidal AC voltage V1 outputted by the first resonant circuit and the second resonant circuit respectively and the phase difference of the second sine wave AC voltage V2 is 180 degrees. Therefore, the CCFL driving circuit only needs two transformer structures Tr21 and Tr22, which is enough to drive multiple U-shaped CCFL tubes 131-13N.

In summary, the transformer structure described in the embodiment of the present invention can be used to drive the driving circuit of CCFLs; and, because of its simple structure and low cost, it can simplify the circuit structure of CCFLs for large-size liquid crystal displays. , can reduce the manufacturing cost and assembly man-hours of the direct type backlight module, and facilitate the application.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (7)

1. a transformer device structure is characterized in that, this transformer device structure comprises:

One coiling unit, this coiling unit includes one first drum stand, one second drum stand and one the 3rd drum stand, include one first accommodation space in this first drum stand, include one second accommodation space in this second drum stand, include one the 3rd accommodation space in the 3rd drum stand, the both ends of this first drum stand and this second drum stand are provided with a low voltage partition plate respectively, the 3rd drum stand arranged outside has a plurality of high pressure dividing plates, and this first accommodation space is connected with the 3rd accommodation space;

Sections core on the one, be used to form magnetic flux path, this day, the sections core included a center magnetic conductor and two side column magnetic conductors, and this center magnetic conductor wore this first accommodation space and the 3rd accommodation space, this day a wherein side column magnetic conductor of sections core wore this second accommodation space;

One low pressure coiling group, this low pressure coiling group is arranged between two low voltage partition plates, and this first drum stand and this second drum stand are surrounded and the formation primary side;

One high-tension winding group, this high-tension winding group is arranged between a plurality of high pressure dividing plates, and the 3rd drum stand is surrounded and the formation secondary side;

One over cap is used to cover this coiling unit, this low pressure coiling group and this high-tension winding group, with isolated electrical interference.

2. transformer device structure as claimed in claim 1 is characterized in that, wherein, this day, the sections core was by two E sections core be combined intos.

3. transformer device structure as claimed in claim 2 is characterized in that, wherein, between the center magnetic conductor of two E sections cores a gap is arranged apart.

4. transformer device structure as claimed in claim 1 is characterized in that, wherein, this day the sections core form by an E sections core and an I sections core, or form by a C sections core and a T sections core.

5. transformer device structure as claimed in claim 1 is characterized in that, wherein, this over cap and this coiling unit in conjunction with the time mutual close-fitting and engaging, or pass through Fastening tenon structure and engage.

6. transformer device structure as claimed in claim 1 is characterized in that, wherein, and this center magnetic conductor and this first accommodation space or the mutual close-fitting of the 3rd accommodation space.

7. transformer device structure as claimed in claim 1 is characterized in that, wherein, and this side column magnetic conductor and the mutual close-fitting of this second accommodation space.

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