CN201117401Y - Transformer for current converter - Google Patents

Abstract

The utility model relates to a high-tension transformer technical field refers in particular to a transformer for transverter, include unshakable in one's determination, magnetic conductive plate and a bobbin, wherein unshakable in one's determination for U type or E type or according to the special construction of its principle evolution, insert and locate among the bobbin, and magnetic conductive plate then is day style of calligraphy or mesh style of calligraphy or according to the special construction of its principle evolution, then arrange in on the bobbin and combine with unshakable in one's determination, make primary side winding and secondary side winding on the bobbin separated by the magnetic conductive plate, form stable magnetic line of force leakage passageway, make the transformer can therefore special structure and have big and stable leakage inductance value.

Description

A transformer for a converter

Technical field:

The utility model relates to the technical field of high-voltage transformers, in particular to a transformer used for converters.

Background technique:

Cold Cathode Fluorescent Lamps (CCFLs) are widely used as backlight sources for LCDs due to their light weight, low heat generation, and high conversion efficiency from electricity to light. Lighting the lamp requires a high starting voltage, and the external power supply of the cold cathode fluorescent lamp is mainly AC power. Boosted to a voltage that allows cold cathode fluorescent lamps to operate. In the driving circuit of his excitation type, an external IC is used to control the voltage, and a starting voltage is provided to light the lamp when starting, and then the voltage is dropped to the normal working voltage. In addition, a high-voltage capacitor must be added to the drive circuit to adjust the characteristics of the drive circuit with high capacitive reactance, so that each lamp can reach resonance when it starts up, and increase the resonance gain of the circuit to light up the lamp smoothly.

In addition, in the case of driving multiple lamps, due to the differences in the characteristics of the lamps themselves, the brightness of different lamps is different, and the high capacitive reactance of the high-voltage capacitor can drive the brightness of each lamp to tend to balance. However, the larger the capacitive reactance value of the high-voltage capacitor itself, the higher the electric power required to consume, so that the inverter must provide higher electric power in order to provide the electric power required for the operation of the driving circuit and the lamp tube. Moreover, adding a high-voltage capacitor increases the complexity and manufacturing cost of the overall control circuit, and the life of the capacitor is lower than that of other components in the drive circuit, and it is prone to damage after the circuit is continuously switched.

As far as the transformer itself is concerned, the output of the secondary side of each bobbin will also have inconsistencies, resulting in an output error. In the case where different transformers drive the output together, there will also be an output difference. This error must be added to the circuit Adjustments are made to adjust the error to an allowable range, but adding an external circuit will increase the manufacturing cost.

In addition, when the load power of the lamp tube increases, the leakage inductance of the transformer used in the inverter will be required to increase to meet the needs of the circuit, and in order to solve the problem of lamp current balance, the error value of the leakage inductance will also be required to be adjusted. within a certain range.

Utility model content:

The purpose of this utility model is to provide a transformer used for converters to improve the leakage inductance of the transformer and reduce the error value of the transformer to realize or reduce the inductance between the winding frames. Lamp current balance.

In order to achieve the above purpose, the technical solution adopted by the utility model is: including iron core, winding frame and magnetic guide plate, a hollow part is formed inside the winding frame, the iron core is placed in the hollow part of the winding frame, and the magnetic guide plate includes a body and two sets of protruding parts, the two groups of protruding parts are formed by extending outwards from the four sides of the main body, the magnetic permeable plate is covered on the winding frame, and the protruding parts at both ends of the magnetic permeable plate correspond to the two ends of the iron core.

There is at least one groove on the surface of the iron core, and at least one leakage inductance part is provided on the magnetic permeable plate, and the leakage inductance part is located between one group of protruding parts, and the number of leakage inductance parts corresponds to the number of grooves in the iron core.

The two groups of protruding parts are located on four opposite sides of the main body, and are vertical or not perpendicular to the main body.

The leakage inductance part is composed of at least one convex rib.

The outside of the bobbin frame is provided with a primary side winding part, a leakage inductance area and a secondary side winding part, and the leakage inductance area is located between the primary side winding part and the secondary side winding part.

The beneficial effects of the utility model are: the arrangement of the magnetic guide plate and the leakage inductance part can be used to determine the leakage inductance and leakage inductance stability, balance the output of the secondary side, and reduce the error value of the output. The improvement of the leakage inductance can further increase the leakage inductance of the secondary side. When applied to the cold cathode fluorescent lamp drive circuit, the ratio of the leakage inductance of the secondary side to the capacitive reactance and inductive reactance of the lamp can be increased, so that the lamp The influence of the characteristics of the tube itself on the tube current is reduced. At the same time, there is an opportunity to not need to add high-voltage capacitor components, but directly use the high leakage inductance of the secondary side to adjust the resonance gain of each lamp, and form a resonance phenomenon to start each lamp when the starting voltage is input.

Description of drawings:

Fig. 1 is a structural representation of the utility model;

Fig. 2 is a schematic structural view of the utility model winding frame;

Fig. 3 is a top view of the utility model magnetic plate;

Fig. 4 is the left side view of the magnetic guide plate of the present utility model;

Fig. 5 is a structural schematic diagram of the iron core of the utility model.

Detailed ways:

As shown in Figures 1 to 5, the utility model includes an iron core 1, a winding frame 2 and a magnetically conductive plate 3, a hollow portion 21 is formed inside the winding frame 2, and the iron core 1 is placed in the hollow portion 21 of the winding frame 2, wherein The iron core 1 is U-shaped or E-shaped or a special structure evolved according to its principle. The magnetic plate 3 includes a body 31 and two sets of protrusions 32, and the two sets of protrusions 32 extend outward from the four sides of the body 31. One group of protruding parts 32 extends longer, and the other group of protruding parts 32 extends shorter. The surface of the iron core 1 is provided with at least one groove 11, and the magnetically conductive plate 3 is provided with at least one leakage inductance part 33. The leakage inductance part 33 is located between one set of protruding parts 32 and is connected to another set of protruding parts 32. The number of leakage inductance parts 33 corresponds to the number of grooves 11 of the core 1, and the magnetically conductive plate 3 covers the bobbin 2, and the protrusions 32 at both ends of the magnetically permeable plate 3 correspond to the two ends of the iron core 1.

The two groups of protrusions 32 are located on four opposite sides of the main body 31 , and are vertical or not perpendicular to the main body 31 .

The leakage inductance part 33 is composed of at least one convex rib.

The outside of the bobbin 2 is provided with a primary side winding part 22, a leakage inductance area 24 and a secondary side winding part 23, and the leakage inductance area 24 is located at the primary side winding part 22 and the secondary side winding part 23 between.

When the utility model is applied to a separately excited drive circuit, it can increase the ratio of the leakage inductance of the secondary side to the electrical characteristics of the cold cathode fluorescent lamp (CCFL) itself, reduce the influence of the characteristics of the lamp tube, and make the leakage of the secondary side Inductive reactance dominates the electrical characteristics of the drive circuit. Therefore, there is no need to add a high-voltage capacitor, and the high leakage inductance can be used to make the lamps resonate, so as to facilitate the start-up of the lamps. In other words, the utility model uses the high leakage inductance to replace the high capacitance of the original high-voltage capacitor. Adjust the characteristics of the drive circuit to allow the lamp to resonate when the lamp is lit. At the same time, the high leakage inductance with low error can also drive the brightness of each lamp to balance, and the brightness will not be inconsistent due to the difference in the electrical characteristics of each lamp.

Claims (5)

1. A transformer for a converter, comprising an iron core, a winding frame and a magnetically conductive plate. A hollow portion is formed inside the winding frame, and the iron core is placed in the hollow portion of the winding frame. It is characterized in that: the magnetically conductive plate includes A body and two sets of protrusions, the two sets of protrusions are formed by extending outward from the four sides of the body, the magnetic conductive plate covers the winding frame, and the protrusions at both ends of the magnetic conductive plate are connected with the two ends of the iron core correspond. 2. A transformer for a converter according to claim 1, characterized in that at least one groove is opened on the surface of the iron core, and at least one leakage inductance part is provided on the magnetic conductive plate, and the leakage inductance part Located between one group of protruding parts, the number of leakage inductance parts corresponds to the number of grooves in the iron core. 3. A transformer for an inverter according to claim 1, wherein the two groups of protrusions are located on four opposite sides of the main body, and are perpendicular or not perpendicular to the main body. 4. A transformer for a converter according to claim 2, wherein said leakage inductance part is formed by at least one rib. 5. A transformer for a converter according to claim 1, characterized in that: the outside of the winding frame is provided with a primary side winding part, a leakage inductance area and a secondary side winding part, The leakage inductance region is located between the primary side winding part and the secondary side winding part.

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