CN201117418Y - Converter one-push-three transformer - Google Patents

Abstract

The utility model relates to a high voltage transformer technical field refers in particular to a transverter pushes away three transformers, and it is including having at least three center pillar, having three magnetic conduction board, coil at least, its characterized in that: the center pillar is sleeved with a coil, one side of the center pillar is provided with a magnetic conduction plate, the coil is provided with a lighting lamp, the ratio of secondary side leakage inductive reactance to lamp tube capacitive reactance and inductive reactance can be improved, the influence of the characteristics of the lamp tube on tube current is reduced, and meanwhile, a high-voltage capacitor assembly does not need to be additionally arranged, the resonance gain of each lamp tube is adjusted by directly utilizing the secondary side high leakage inductive reactance, and a resonance phenomenon is formed to start each lamp tube when starting voltage is input.

Description

A kind of converter, one push three transformers

Technical field:

The utility model relates to the technical field of high-voltage transformers, in particular to a converter-one push-three transformer.

Background technique:

Cold Cathode Fluorescent Lamps (CCFLs) are widely used in LCD backlight sources because of their light weight, low heat generation, and high electricity-to-light conversion efficiency. A high starting voltage is required to light up the lamps, and The external power supply of CCFLs is mainly AC power, and its voltage and current cannot drive CCFLs to operate. Therefore, an inverter must be used to convert the voltage to a voltage that can be used for CCFLs 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. The life of the high-voltage capacitor is also 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 applied to the converter transformer increases, the leakage inductance will be required to increase to meet the demand of the circuit, and in order to solve the problem of the current balance of the lamp tube, the error value of the leakage inductance will also be required to be fixed. Within the range, and in order to reduce the cost of the transformer, the industry has been conceiving and developing a solution that a transformer has multiple lamp tubes and can balance the current of the lamp tubes.

Utility model content:

Aiming at the deficiencies of the prior art, the purpose of this utility model is to provide a converter that pushes three transformers, one pushes the primary current of three or more transformers and reduces the leakage inductance error value of the transformer to achieve or reduce the The difference in lamp current between.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a converter with three transformers, which includes at least three central columns, at least three magnetic guide plates, and coils, and is characterized in that: the central columns are covered with coils , One side of the center column is provided with a magnetically conductive plate.

The central column is integrally formed and the magnetic circuit is a semi-disconnected structure.

The central column is composed of more than three guide rods, and gap pads are provided between the guide rods.

The coil is provided with a lighting lamp.

The magnetic leakage column is arranged on the magnetic conductive plate.

The central column is I-shaped.

The beneficial effects of the utility model are as follows: it includes at least three central columns, at least three magnetic guide plates and coils, coils are sheathed on the central columns, one side of the central column is provided with a magnetic guide plate, and the central columns are U-shaped and I-shaped. Using the half-disconnected or disconnected center column of the magnetic circuit, the integrated magnetic plate, and the serial connection of 1' coil or 3' coil can be used to balance or reduce the error value of the lamp current. The setting of the magnetic leakage column of the magnetic plate and the U guide bar middle column can promote the improvement of the leakage inductance and reduce the error value of the leakage inductance, and further increase the leakage inductance of the secondary side. When applied to the CCFLs drive circuit , can increase the ratio of the leakage inductance of the secondary side to the capacitive and inductive reactance of the lamp tube, so that the influence of the characteristics of the lamp tube itself on the tube current can be 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 schematic diagram of the utility model embodiment one;

Fig. 2 is the schematic diagram of the second embodiment of the utility model;

Fig. 3 is the schematic diagram of the third embodiment of the utility model;

Fig. 4 is a schematic diagram of Embodiment 4 of the utility model;

Fig. 5 is a schematic diagram of Embodiment 5 of the utility model;

Fig. 6 is a schematic diagram of Embodiment 6 of the present utility model.

Detailed ways:

As shown in Figures 1, 2, 3, 4, 5, and 6, a converter with one drive and three transformers includes at least three central columns, at least three magnetic guide plates, and coils, and is characterized in that: There is a coil, one side of the central column is provided with a magnetic guide plate, a lighting lamp is provided on the coil, a magnetic leakage column is provided on the magnetic guide plate, and the central column is I-shaped.

To achieve the above purpose, the present invention provides a converter transformer, which includes a center column, a magnetic guide plate and several coils, as shown in Fig. 1 and Fig. 6 .

Each group of 32 coils is connected in series, through the current law, it has the ability to force the current balance of each group of 32 coils, and can also force the current balance of 31 coils to reduce the current error between the lamps. Please refer to Figure 1 to Figure 3.

Some magnetic plates have magnetic leakage columns, which function to increase the leakage of magnetic lines of force to increase the leakage inductance, see Figure 4 to Figure 6.

The central column can be integrally formed, as shown in Figure 1, or composed of several I-shaped guide rods, as shown in Figures 2 to 4. Or it is composed of several U-shaped guide rods, please refer to Figure 5 to Figure 6. The middle column of the U-shaped guide rod is matched with the magnetic leakage column of the magnetic plate, which has the function of reducing the error of the leakage inductance.

Each group of 33 coils is connected in series. Through the coupling theory and current law, it has the ability to force the current balance of each group of 32 coils, and can jointly force the current balance of the 31 coils to reduce the current error between the lamps. Please refer to Figure 4 to Figure 5.

Each group of 33 coils of each transformer can be connected in series with each other. Through coupling theory and current law, it has the ability to force the current balance of each group of 32 coils of each transformer, and can jointly force the current balance of each group of 31 coils of each transformer to reduce Please refer to Figure 6 for the current error between each lamp.

In order to further understand the purpose, structure, features, and functions of the present utility model, the detailed description of the embodiments is as follows.

Embodiment 1, as shown in Figure 1, a converter with one drive and three transformers, the center column is integrally formed and the magnetic circuit is a semi-disconnected structure, and the method of connecting 32 coils in series is used in separately excited drives In the circuit, the current of each group of 32 coils can be forced to be consistent, and then the current of the lamp tube on the secondary side can also be affected to be consistent, so as to achieve the purpose of lamp current balance.

Embodiment 2, as shown in Figure 2, a converter with one drive and three transformers, the center column is composed of three I-shaped guide rods and the magnetic circuit is a completely disconnected structure, and the method of connecting 32 coils in series is used in the application In the separately excited driving circuit, the current of each group of 32 coils can be forced to be consistent, and then the current of the lamp tube on the secondary side can also be consistent, achieving the goal of lamp current balance.

Embodiment 3, as shown in Figure 3, a converter with one drive and three transformers, the central column is composed of three I-shaped guide rods and the magnetic circuit is a completely disconnected structure, and its magnetic plate has three leakage magnetic columns, respectively Corresponding to three I-shaped guide rods to increase the leakage inductance and reduce the error of the leakage inductance, and using the method of connecting 32 coils in series, when applied to a separate excitation drive circuit, the current of each group of 32 coils can be forced to be consistent, and then The lamp current affecting the secondary side can also be consistent, achieving the goal of lamp current balance.

Embodiment 4, as shown in Figure 4, a converter with one push and three transformers, the center column is composed of three I-shaped guide rods and the magnetic circuit is a completely disconnected structure, and its magnetic plate is slightly different from that in Figure 3. Simplified, there are three leakage flux columns corresponding to three I-shaped guide rods to increase the leakage inductance and reduce the error of the leakage inductance, and the method of connecting 33 coils in series can force the The currents of the 32 coils in each group are consistent, which further affects the current of the lamp tubes on the secondary side to be consistent, achieving the goal of lamp current balance.

Embodiment 5, as shown in Figure 5, a converter with one drive and three transformers, the central column is composed of three U-shaped guide rods and the magnetic circuit is a completely disconnected structure, and its magnetic plate is slightly different from that in Figure 3. Simplified, there are three magnetic flux leakage columns corresponding to three shaped rods to increase the leakage inductance and reduce the error of the leakage inductance, and the method of connecting 33 coils in series can force each group to The currents of the 32 coils are consistent, which further affects the current of the lamp tubes on the secondary side to be consistent, achieving the purpose of balancing the lamp currents.

Embodiment 6, as shown in Figure 6, a converter with one drive and three transformers, the central column is composed of three U-shaped guide rods and the magnetic circuit is a completely disconnected structure, and its magnetic plate is slightly different from that in Figure 3. Simplified, there are three leakage flux columns corresponding to three U-shaped guide rods to increase the leakage inductance and reduce the error of the leakage inductance, and use the method of connecting the 33 coils of two or more transformers in series to be applied to other excitations. When driving the circuit in the same way, the currents of the 32 coils in each group can be forced to be consistent, which in turn affects the current of the lamp tubes on the secondary side to be consistent, achieving the goal of lamp current balance.

The embodiments described above are only preferred examples of the utility model, and are not intended to limit the scope of implementation of the utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the patent scope of the utility model, All should be included in the utility model patent application scope.

Claims (6)

1. A converter with one drive and three transformers, which includes at least three central columns (1), at least three magnetic guide plates (2), and coils (3), characterized in that: the central column (1) is wound with The coil (3), one side of the center column (1) is provided with a magnetically conductive plate (2). 2. A converter-one-push-three transformer according to claim 1, characterized in that: the central column (1) is integrally formed and the magnetic circuit is a semi-disconnected structure. 3. The one-to-three converter transformer according to claim 1, characterized in that: the central column (1) is composed of more than three guide rods, and there is a Clearance pads (6). 4. The one-to-three inverter transformer according to claim 1, characterized in that: said coil (3) is provided with a light tube (4). 5. The one-to-three converter transformer according to claim 1, characterized in that: the magnetic-conductive plate (2) is provided with a magnetic leakage column (5). 6. A converter-one-push-three transformer according to claim 1, characterized in that: said central column (1) is I-shaped.

Images