CN201017758Y

CN201017758Y - High-frequency high voltage booster transformer

Info

Publication number: CN201017758Y
Application number: CNU2007200342983U
Authority: CN
Inventors: 张枝兵; 袁云
Original assignee: HAIDE ELECTRONIC CO Ltd WUXI
Current assignee: HAIDE ELECTRONIC CO Ltd WUXI
Priority date: 2007-02-07
Filing date: 2007-02-07
Publication date: 2008-02-06
Anticipated expiration: 2017-02-07

Abstract

The utility model relates to an improvement of a high frequency high voltage step up transformer, which is characterized in that the magnetic core of the transformer is in a U-shaped structure, the high voltage winding and the low voltage winding are separated side by side, and are respectively sleeved on the two pins of the U-shaped magnetic core. The utility model not only effectively increases the slot-based winding slot positions, lowers the voltages between the secondary high voltage coil circles, and can realize the high power, but also can enhance the utilization rate of the coil frame. In particular, the utility model arranges the secondary high voltage winding into two coaxial coils with the same number of turns, and can realize the differential driving of a lamp pipe on the same transformer, to make the transformer have simple structure, good reliability and low cost. The high frequency high voltage step up transformer of the utility model can be used not only for a liquid crystal screen using a CCFL or EEFL lamp pipe as the back light source, but also for other display products using CCFL or EEFL lamp pipes as the back light sources, such as a display screen of an advertising lamp box.

Description

High frequency high voltage step-up transformer

Technical field

Utility model is about to the improvement of electronics with high frequency high voltage step-up transformer, relates in particular to the high frequency high voltage step-up transformer that a kind of high-low pressure winding branch is arranged.

Technical background

High frequency high voltage step-up transformer (abbreviation transformer), for example supply with liquid crystal display screen CCFL backlight or EEFL fluorescent tube with high-frequency and high-voltage (alternating current inverter step-up transformer for example 〉=1500V), its basic structure is: the primary and secondary winding technique is on an axial wire frame skeleton, form single output secondary winding, by primary coil 5 high-frequency signal of input is converted to magnetic energy, send secondary coil 3 to by magnetic core 1.1 and 1.2.The H.V. step up transformer of this secondary single winding, because secondary voltage is higher, coil windings is born the voltage height, not only wave enamel is had relatively high expectations, and the reliability of coil is low easy breakdown damage.For reducing high pressure winding coil turn-to-turn voltage, the improvement employing is provided with some insulation gaps and divides groove 4 on secondary winding 3, carries out the coiling of branch groove to reduce voltage (Fig. 2) between coil turn; Though divide the groove coiling can effectively reduce voltage between coil turn, improve the coil reliability, when transformer efficiency was big, the skeleton utilance is low, and was uneconomical.In same axial this structure, guarantee primary and secondary safety isolation, can increase volume of transformer (axially lengthening).For improving the utilance of skeleton, and effectively reduce voltage between coil turn, also there are two of employings or above transformer to share secondary high pressure, realize the differential driving (lamp tube ends adds phase phasic difference 180 degree voltages respectively) of fluorescent tube, but along with the increase of fluorescent tube quantity, transformer will correspondingly increase, make the inverter overall dimension of forming strengthen, the circuit complexity, manufacturing cost strengthens, and also can cause the inverter reliability to reduce simultaneously.

The utility model content

The utility model purpose is to overcome above-mentioned prior art deficiency, and a kind of turn-to-turn voltage that can effectively reduce the secondary high pressure coil is provided, and fail safe is good, can improve the high frequency high voltage step-up transformer of skeleton utilance again.

The utility model purpose realizes, the main improvement is: the secondary high pressure winding of high frequency high voltage step-up transformer is side by side with elementary low pressure winding separates, be sheathed on respectively on two posts of U type magnetic core, thereby make secondary winding that enough branch groove groove positions be arranged, can reduce the turn-to-turn voltage of secondary high pressure coil, and the utilance that improves coil rack, realize this patent purpose.Specifically, the utility model high frequency high voltage step-up transformer comprises magnetic core and outer sheathed high and low pressure winding, it is characterized in that said magnetic core is U type structure, and the high and low pressure winding is side by side separately, is sheathed on respectively on two posts of U type magnetic core.

A kind of better structure of utility model is, the secondary high pressure winding is divided into coaxial 2, and according to the circuit needs, 2 umber of turns can be identical, also can be different, and be connected into a winding on the line and use.Wherein be all mutually with 2 umber of turns especially, can realize differential driving by a transformer to fluorescent tube, after the increase of fluorescent tube quantity, power requirement increase, need not to increase number transformer, only need to use larger sized transformer, can reduce number transformer, improve the reliability of inverter.

In addition, for improving the applicability of transformer, utility model can also also be divided into the elementary winding of transformer coaxial 2 windings, and 2 umber of turns can be identical, also can be different, can be used for respectively being operated in recommend, in the circuit of half-bridge, asymmetrical half-bridge, full-bridge topologies.

The utility model high frequency high voltage step-up transformer, because high voltage secondary winding and elementary winding are separated side by side, divide and be located on two pin of U type magnetic core, effectively increased branch groove coiling groove position, can reduce the turn-to-turn voltage of secondary high pressure coil, not only can reduce insulating requirements, and can realize high-powerly, and can improve the utilance of coil rack enamelled wire.Especially secondary high pressure winding branch is set as coaxial 2 identical coils of the number of turn, can realizes the differential driving of fluorescent tube on same transformer, can reduce number transformer only needs one, make inverter structure simple, can dwindle the inverter volume, good reliability, cost is low.The utility model high frequency high voltage step-up transformer not only can be used to light liquid crystal display screen CCFL backlight or EEFL fluorescent tube, but also can be used for CCFL or EEFL fluorescent tube on some other demonstration product as light source, for example the advertising lamp box display screen.

Below in conjunction with three embodiments, further specify utility model, but the embodiment concrete structure should not be construed as the qualification to utility model, some show the change that you easily see In the view of the technical staff, still belong to the utility model scope.

Description of drawings

Fig. 1 is the single output secondary winding of a prior art transformer circuit schematic diagram.

Fig. 2 divides groove winding structure schematic diagram for single output secondary winding transformer.

Fig. 3 is utility model transformer the 1st embodiment circuit theory diagrams.

Fig. 4 is Fig. 3 structural representation.

Fig. 5 is utility model transformer the 2nd embodiment circuit theory diagrams.

Fig. 6 is Fig. 5 structural representation.

Fig. 7 is utility model transformer the 3rd embodiment circuit theory diagrams.

Fig. 8 is Fig. 7 structural representation.

Embodiment

Embodiment 1: referring to Fig. 3,4, the utility model high frequency high voltage step-up transformer, comprise 2 can be involutory U type magnetic core 6.1,6.2, be divided into primary coil skeleton 2.1 and secondary coil skeleton 2.2 on U type magnetic core two posts, primary coil skeleton 2.1 is wound with elementary winding 5 (NP), divides groove to be wound with secondary high pressure winding 3 (NS) on the secondary coil skeleton 2.2.

Embodiment 2: referring to Fig. 5,6, as embodiment 1, divide groove to be wound with 2 secondary winding 3.1 and 3.2 that the number of turn is identical on the secondary coil skeleton 2.2.

Embodiment 3: referring to Fig. 7,8, as embodiment 2, be wound with 2 elementary windings 5.1 and 5.2 that the number of turn is identical on the primary coil skeleton 2.1.

Claims

1. high frequency high voltage step-up transformer comprises magnetic core and outer sheathed high and low pressure winding, it is characterized in that said magnetic core is U type structure, and the high and low pressure winding is side by side separately, is sheathed on respectively on two posts of U type magnetic core.

2. according to the described high frequency high voltage step-up transformer of claim 1, it is characterized in that secondary winding is coaxial 2.

3. according to the described high frequency high voltage step-up transformer of claim 2, it is characterized in that 2 umber of turns are identical.

4. according to claim 1,2 or 3 described high frequency high voltage step-up transformers, it is characterized in that elementary winding is coaxial 2.

5. according to the described high frequency high voltage step-up transformer of claim 4, it is characterized in that 2 umber of turns are identical.