KR200457752Y1 - Transformer and backlight apparatus - Google Patents

Abstract

The present invention discloses a transformer and a backlight device. The backlight device includes a power module, a lamp, and a transformer. The transformer includes a bobbin, a primary winding, a secondary winding, a first conductive plate and a second conductive plate. The bobbin includes a high voltage winding region and a pin. The primary winding is coupled to the power module. The secondary winding is wound in the high voltage winding area and one end of which is electrically connected to the pin, which is also coupled to the lamp of the backlight device. The separator is disposed in the high voltage winding area. The first conductive plate is disposed on the separator plate and electrically connected to the pin. The second conductive plate is disposed on the separator plate and positioned to correspond to the first conductive plate. Accordingly, the first conductive plate and the second conductive plate form a capacitor.

Backlight unit, power module, lamp, transformer

Description

Transformers & Backlight Units {TRANSFORMER AND BACKLIGHT APPARATUS}

The present invention relates to a transformer and a backlight device, and more particularly, to a transformer having a built-in protective capacitor and a backlight device having such a transformer structure.

In recent years, as the size of a liquid crystal display (LCD) panel increases, a backlight device including a plurality of cold cathode fluorescent lamps (CCFLs) is widely used to provide high quality light sources required for a liquid crystal display panel. Each lamp brightness of the multiple lamp backlight device is associated with a current flow through the lamp. Thus, the design issues of a multiple lamp backlight device include how to keep the current through all lamps the same and how to prevent imbalances that occur between these lamps. In addition, the protection for the circuit of a multiple lamp backlight device under some fault conditions (eg short circuit, disconnection) is a significant problem even in a multiple lamp backlight system.

In traditional backlight systems, the high voltage output of the transformer is usually combined with the high voltage capacitor of the circuit board. High voltage capacitors are used to regulate the output signal of the transformer. Furthermore, the high voltage capacitor can be connected in series with another capacitor or resistor to form a voltage dividing circuit, which is part of the protection circuit.

See FIG. 1. 1 is a schematic view showing a backlight device 1 according to the prior art. As shown in FIG. 1, the backlight device 1 includes a power supply module 10, at least one lamp 12, and a transformer 14. In FIG. 1, an example is shown that includes a one-to-one transformer 14 and one single lamp 12.

The transformer 14 driven by the power supply module 10 is used to operate the load (lamp 12). The high voltage side of the transformer 14 is connected to the lamp 12 and the capacitor 16. The capacitor 16 is then connected in series with other passive components 18, which may be resistors or capacitors. Capacitor 16 and passive component 18 form a voltage divider circuit. The voltage divider circuit can generate a feedback input for the protection feedback circuit 20.

See FIG. 2. FIG. 2 is a schematic diagram illustrating the backlight device 1 and the transformer 14 of FIG. 1. As shown in FIG. 2, the transformer 14 includes a bobbin 140, a primary winding 142, and a secondary winding 144. The primary winding 142 is connected to the power module 10. The secondary winding 144 is wound around the high voltage winding region 1402 of the bobbin 140. One end of the secondary winding 144 is electrically connected to the lamp 12 and the capacitor 16. Capacitor 16, passive component 18 and protective feedback circuit 20 form a feedback structure having a voltage divider circuit comprising a conventional high voltage capacitor.

As shown in Figure 1, in a traditional backlight device, the capacitor must be on the output side of the transformer. If the transformer is a one-to-four transformer, at least four capacitors are required as part of the protective circuit cooperating with the one-to-four transformer. However, improved manufacturing processes so far have made circuits increasingly compact in size. Providing some capacitors on the circuit board to cooperate with the transformer is inefficient in the on-chip area allocation.

Accordingly, the present invention discloses a transformer for solving the above problems and a backlight device using the transformer.

One aspect of the present invention is to provide a transformer. The transformer is suitable for a backlight module having a first lamp. The transformer includes a bobbin, a secondary winding, a first conductive plate, and a second conductive plate.

According to one embodiment of the present invention, the bobbin has a high voltage winding region and a first pin thereon. The secondary winding is wound around the high voltage winding region. One end of the secondary winding is electrically connected to the first pin. The first pin is connected to the first lamp of the backlight module. The high voltage winding region has a first separator. The first conductive plate is located in the first separator. The first conductive plate is electrically connected to the first pin. The second conductive plate is located in the first separator. The second conductive plate is positioned corresponding to the first conductive plate such that the first conductive plate and the second conductive plate form a first capacitor.

Another aspect of the present invention is to provide a transformer. The transformer is suitable for a backlight module having a first lamp and a second lamp. The transformer includes a bobbin, a first secondary winding, a second secondary winding, a first conductive plate, a second conductive plate, a third conductive plate, and a fourth conductive plate.

According to another embodiment of the present invention, the bobbin has a first high voltage winding region, a second high voltage winding region, and first and second pins thereon. The first secondary winding is wound around the first high voltage winding region. One end of the first secondary winding is electrically connected to the first pin. The first pin is connected to the first lamp of the backlight module. The second secondary winding is wound around the second high voltage winding region. One end of the second secondary winding is electrically connected to the second pin. The second pin is connected to the second lamp of the backlight module. The first high voltage winding region has a first separator. The first conductive plate is disposed in the first separator. The first conductive plate is electrically connected to the first pin. The second conductive plate is disposed in the first separator. The second conductive plate is positioned corresponding to the first conductive plate such that the first conductive plate and the second conductive plate form a first capacitor. The second high voltage winding region has a second separator. The third conductive plate is disposed in the second separator. The third conductive plate is electrically connected to the second pin. The fourth conductive plate is disposed in the second separator. The fourth conductive plate is positioned to correspond to the third conductive plate such that the third conductive plate and the fourth conductive plate form a second capacitor.

Another aspect of the present invention is to provide a backlight device. The backlight device includes a power supply module, a first lamp, and a transformer. The transformer includes a bobbin, a primary winding, a secondary winding, a first conductive plate, and a second conductive plate.

According to another embodiment of the present invention, the bobbin has a low voltage winding region, a high voltage winding region, and a first pin thereon. The primary winding is wound around the low voltage winding region. The primary winding is connected to the power module. The secondary winding is wound around the high voltage winding region. One end of the secondary winding is electrically connected to the first pin. The first pin is connected to the first lamp of the backlight device. The high voltage winding region has a first separator. The first conductive plate is disposed in the first separator. The first conductive plate is electrically connected to the first pin. The second conductive plate is disposed in the first separator. The second conductive plate is positioned corresponding to the first conductive plate such that the first conductive plate and the second conductive plate form a first capacitor.

Another aspect of the present invention is to provide a backlight device. The backlight device includes a power supply module, a first lamp, a second lamp, and a transformer. The transformer includes a bobbin, a primary winding, a first secondary winding, a second secondary winding, a first conductive plate, a second conductive plate, a third conductive plate, and a fourth conductive plate.

According to another embodiment of the present invention, the bobbin has a low voltage winding region, a first high voltage winding region, a second high voltage winding region, and first and second pins thereon. The primary winding is wound around the low voltage winding region. The primary winding is connected to a power module. The first secondary winding is wound around the first high voltage winding region. One end of the first secondary winding is electrically connected to the first pin. The first pin is connected to the first lamp of the backlight device. The second secondary winding is wound around the second high voltage winding region. One end of the second secondary winding is electrically connected to the second pin. The second pin is connected to the second lamp of the backlight device. The first high voltage winding region has a first separator. The first conductive plate is disposed in the first separator. The first conductive plate is electrically connected to the first pin. The second conductive plate is disposed in the first separator. The second conductive plate is positioned corresponding to the first conductive plate such that the first conductive plate and the second conductive plate form a first capacitor. The second high voltage winding region has a second separator. The third conductive plate is disposed in the second separator. The third conductive plate is electrically connected to the second pin. The fourth conductive plate is disposed in the second separator. The fourth conductive plate is positioned to correspond to the third conductive plate such that the third conductive plate and the fourth conductive plate form a second capacitor.

Compared with the prior art, there are at least two conductive plates disposed in the bobbin of the transformer according to the embodiment of the backlight device of the present invention. The conductive plates are arranged side by side and spaced apart by a predetermined distance such that there is a power storage effect between the pair of conductive plates. The conductive plates can be connected to the high voltage side of the transformer and used as protective capacitors in the backlight device circuit. Accordingly, the transformer and the backlight according to the present invention can be implemented in a circuit structure of low cost and compact size.

Advantages and spirit of the present invention will be understood by the following description in conjunction with the accompanying drawings.

See FIG. 3. 3 is a schematic view showing a backlight device 3 and a transformer 34 adopted by the backlight device 3 according to the first embodiment of the present invention. As shown in FIG. 3, the backlight device 3 includes a power supply module 30, a lamp 32, and a transformer 34. The transformer 34 includes a bobbin 340, a primary winding 342, a secondary winding 344, a conductive plate C1, and another conductive plate C2. It should be noted that the transformer 34 of the present embodiment is not limited to this specific structure of the backlight device 3. Transformer 34 may be provided in cooperation with various kinds of backlight modules or in some other electronic devices in practical applications.

In practical applications, the body of transformer 34 is bobbin 340. Bobbin 340 is used to support the windings and receive the magnetic core. The bobbin can be made of an insulating material, for example nylon, polyethylene terephthalate (PET). In general, there may be some separators disposed on the bobbin 340 to define another winding area.

In this embodiment, the bobbin 340 has a low voltage winding region 3400, a high voltage winding region 3402, a pin PIN1, and another pin PIN2. The primary winding 342 is wound around the low voltage winding region 3400 and is connected to the power supply module 30. The secondary winding 344 is wound around the high voltage winding region 3402. One end of the secondary winding 344 is electrically connected to the pin PIN1. The pin PIN1 is also connected to the lamp 32 of the backlight device 3.

There is a specific turns ratio between the primary winding 342 and the secondary windings 344. Based on electromagnetic induction, the primary winding 342 driven by the power supply module 30 induces the same magnetic lopp to the secondary winding 33, and thus the induced secondary winding 344 is a lamp ( Generate an induction output for driving 32). That is, the transformer 34 of the present embodiment may be a one-to-one transformer for driving one single load. In addition to this, the backlight device 3 of the present embodiment includes a single one-to-one transformer corresponding to the single lamp 32. In practical applications, the backlight device may include multiple transformers at the same time, to correspond to more lamps at once. In other words, the number of transformers in the backlight device is not limited to one. Many transformer structures are known to those skilled in the art.

As shown in FIG. 3, the high voltage region 3402 has a separator 3401. The conductive plate C1 and the conductive plate C2 are disposed in the separating plate 34221. The conductive plate C1 is electrically connected to the pin PIN1 and coupled to the lamp 32. The conductive plate C2 is electrically connected to the pin PIN2.

The conductive plate C2 is disposed at a position corresponding to the conductive plate C1. The conductive plate C1 and the conductive plate C2 are made of a conductive material, which may be metal. According to the theory of plate capacitors, an equivalent capacitor can be formed between these two metal plates (conductive plates C1, C2) spaced by a certain distance and disposed facing each other in the dielectric (separator 3421).

이다 (단, A>>d²). 여기서, "ε"는 유전 물질(분리판(34021))의 유전율을 나타내며; "A"는 도전판의 면적을 나타내고; "d"는 두 개의 도전판들 (도전판(C1)과 도전판(C2)) 사이의 거리를 나타낸다. 따라서, 변압기의 고전압 측에서 분리판 내에 배치되는 상기 두 개의 도전판들은 회로 기판 위에 부가 고전압 커패시터를 구현하기 위한 추가 비용 및 공간을 절약하기 위해 내장형 커패시터로 이용될 수 있다. The capacitance of the capacitor may be designed by adjusting the specifications of the conductive plates C1 and C2. For example, the capacity of a flat plate capacitor made of two parallel equally sized conductive plates is approximately

(Where A >> d ² ). Where "ε" represents the permittivity of the dielectric material (separator 3401); "A" represents the area of the conductive plate; "d" represents the distance between two conductive plates (conductive plate C1 and conductive plate C2). Thus, the two conductive plates disposed in the separator on the high voltage side of the transformer can be used as embedded capacitors to save additional cost and space for implementing additional high voltage capacitors on the circuit board.

In the first embodiment, when the built-in capacitor is formed equivalent to the conductive plate C1 and the conductive plate C2, the pin PIN2 electrically connected to the conductive plate C2 is an open circuit as shown in FIG. Can be. In practical application, pin PIN2 may also be connected to the components on the circuit board. In other words, pin PIN2 may be an input for other functions in the transformer. For example, pin PIN2 may be used for protection feedback function.

Referring to FIG. 4, FIG. 4 is a schematic view showing a backlight device 3 'and a transformer 34' adopted by the backlight device 3 'according to another embodiment of the present invention. The main difference between the backlight device 3 'and the backlight device of the first embodiment is that the backlight device 3' further comprises a passive component 36 'and a protective feedback circuit 38'. In this embodiment, rather than an open circuit, the pin PIN2 'is connected to the passive component 36' and the protection feedback circuit 38 '. As shown in FIG. 4, the pin PIN2 'electrically connected to the passive component 36' is grounded through the passive component 36 '. The protection feedback circuit 38 'is electrically connected between the pin PIN2 and the passive component 36'.

The passive component 36 'may be a resistor, a capacitor or an inductor. The passive component 36 'is connected in series with an embedded capacitor formed by the conducting plates C1, C2 in the transformer 34' to form a voltage divider circuit. The voltage dividing output of the voltage dividing circuit can be designed by adjusting the size of the conductive plates, the distance between the conductive plates or the exponent of the passive component 36 'on the circuit board. The voltage division output of the voltage division circuit is used to feed back to the input of the protection feedback circuit 38 'in order to achieve a protection function for the transformer circuit. The behavior of the voltage dividing circuit and the protective feedback circuit 38 'is similar to one of the feedback structure with the voltage dividing circuit including the high voltage capacitor of the prior art. The theory of prior art feedback structures is well known to those skilled in the art and will not be repeated here.

It should be noted that the backlight device 3 'does not require an additional high voltage capacitor on the circuit board. Transformer 34 'utilizes two conductive plates disposed within the separator on the high voltage side to operate as an embedded capacitor on the high voltage side of transformer 34'. Thus, there is no need for additional space to implement additional high voltage capacitors on the circuit board.

See FIG. 5. 5 is a schematic view showing a backlight device 5 and a transformer 54 adopted by the backlight device 5 according to the second embodiment of the present invention. The main difference from the first embodiment is that the backlight device 5 of the second embodiment is a one-to-two backlight device designed to drive two lamps (lamp 52a and lamp 52b) at the same time. The transformer 54 of the backlight device 5 further includes a conductive plate C3 and a conductive plate C4. In other words, the transformer 54 includes a total of four conductive plates (ie, conductive plate C1, conductive plate C2, conductive plate C3, and conductive plate C4), as shown in FIG. , Conductive plate C3 and conductive plate C4 are disposed in pairs in separator plate 54222 of high voltage winding region 5402.

In this embodiment, the bobbin 540 further includes a pin PIN3 and a pin PIN4. The conductive plate C3 is electrically connected to the pin PIN3. The pin PIN3 is electrically connected to one end of the secondary winding 544 and coupled to the lamp 52b. The conductive plate C4 is electrically connected to the pin PIN4. Pin PIN4 may be an open circuit as shown in FIG. 5, and in another embodiment, pin PIN4 may be further connected to the passive components of the backlight device and to the protection feedback circuit. In other words, pin PIN4 may serve as a voltage division input stage for the protection feedback structure. The connection pattern for the voltage dividing circuit and the other detailed structures of the backlight device 5 are similar to those of the above-described embodiment, and thus will not be described herein again.

Based on the above-described structure, the conductive plates C3 and C4 are arranged in pairs to form a capacitor. This means that there are two pairs of conductive plates on the high voltage side of the transformer 54. The pair of conductive plates C1 and C2 correspond to the lamps 52a. The other pair of conductive plates C3 and C4 correspond to the lamps 52b. As a result, a backlight device 5 having a one-to-two transformer 54 and built-in protective capacitors is formed.

See FIG. 6. 6 is a schematic view showing a backlight device 7 according to a third embodiment of the present invention and a transformer 74 employed by the backlight device 7. This transformer 74 is a one to two transformer used to drive two lamps at the same time.

The backlight device 7 includes a power supply module 70, a lamp 72a, a lamp 72b, and a transformer 74. The transformer 74 includes a bobbin 740, a primary winding 742, a first secondary winding 744, a second secondary winding 746, a conductive plate C1, a conductive plate C2, a conductive plate C3, and It includes a conductive plate C4.

In the present embodiment, the bobbin 740 includes the low voltage winding region 7400, the first high voltage winding region 7402, the second high voltage winding region 7404, the pin PIN1, the pin PIN2, the pin PIN3, It has a pin PIN4. Primary winding 742 is wound around low voltage winding region 7400. The primary winding 742 is connected to the power module 70.

The first secondary winding 744 is wound around the first high voltage winding region 7402. One end of the first secondary winding 744 is electrically connected to the pin PIN1. The pin PIN1 is connected to the lamp 72a of the backlight device 7.

The first high voltage winding region 7402 has a separator 7421. The conductive plate C1 and the conductive plate C2 are disposed inside the separator plate 7421. The conductive plate C1 is electrically connected to the pin PIN1 and also coupled to the lamp 72a. The conductive plate C2 is electrically connected to the pin PIN2. The conductive plate C2 is disposed at a position corresponding to the conductive plate C1. The conductive plate C1 and the conductive plate C2 may be made of a metal material. According to the theory of the plate capacitor, an equivalent capacitor can be formed between the conductive plate C1 and the conductive plate C2.

The second secondary winding 746 is wound around the first high voltage winding region 7404. One end of the second secondary winding 746 is electrically connected to the pin PIN3. The pin PIN3 is connected to the lamp 72b of the backlight device 7.

The second high voltage winding region 7404 has a separator 74041. The conductive plate C3 and the conductive plate C4 are disposed inside the separator plate 74041. The conductive plate C3 is electrically connected to the pin PIN3. The conductive plate C4 is disposed at a position corresponding to the conductive plate C3. The conductive plate C3 and the conductive plate C4 may be made of a metal material. According to the theory of the plate capacitor, an equivalent capacitor can be formed between the conductive plate C3 and the conductive plate C4.

According to the above-described structure, there are two pairs of conductive plates on the high voltage side of the transformer 74. The pair of conductive plates C1 and C2 correspond to the lamps 72a. The other pair of conductive plates C3 and C4 correspond to the lamp 72b. Thus, a backlight device 7 having a one-to-two transformer 74 and built-in protective capacitors is provided.

See FIG. 7. 7 is a schematic diagram showing a backlight device 9 according to a fourth embodiment of the present invention and a transformer 94 adopted by the backlight device 9. Compared with the third embodiment, this transformer 94 is a one-to-four transformer used to drive four lamps (lamp 92a, lamp 92b, lamp 92c, lamp 92d) at the same time.

Compared with the backlight device 7 of the third embodiment, the transformer 94 of the backlight device 9 further includes a conductive plate C5, a conductive plate C6, a conductive plate C7 and a conductive plate C8. do. In other words, the transformer 94 includes all eight conductive plates. As shown in FIG. 7, the conductive plate C5 and the conductive plate C6 are disposed in pairs in the separator plate 20622 on the second high voltage winding region 9402; The conductive plate C7 and the conductive plate C8 are disposed in pairs in the separating plate 94042 on the second high voltage winding region 9504. The other detailed structures of the backlight device 9 are similar to those of the above-described embodiment, and thus will not be described herein again.

In this embodiment, the conductive plates C5 and C6 are arranged in pairs to form capacitors corresponding to the lamps 92c, and the conductive plates C7 and C8 are lamps 92d. Are arranged in pairs to form capacitors corresponding thereto. In other words, four pairs of conductive plates (conductive plate C1 and conductive plate C2, conductive plate C3 and conductive plate C4, conductive plate C5 and conductive plate) on the high voltage side of transformer 94 (C6), conductive plates C7 and conductive plates C8), which correspond to four loads (lamp 92a, lamp 92b, lamp 92c, lamp 92d), respectively. Capacitors can be formed. As a result, a backlight device 9 having a one-to-four transformer 94 and built-in protective capacitors is formed.

Compared with the prior art, there are at least two conductive plates inside the bobbin of the transformer according to the embodiment of the present invention. Since the conductive plates are arranged side by side and spaced apart by a certain distance, there is a power storage effect between the pair of conductive plates. The conductive plates can be connected to the high voltage side of the transformer to act as a protective capacitor in the circuit of the backlight device. Accordingly, the transformer and the backlight device according to the present invention can be implemented in such a low cost and compact size circuit structure.

In conjunction with the above examples and descriptions, the features and spirit of the invention will be hopefully well described. Those skilled in the art will readily appreciate that numerous modifications and changes can be made while keeping to the teachings of the present invention. Accordingly, the foregoing is intended to be limited only by the scope and scope of the appended claims.

1 is a schematic view showing a backlight device according to the prior art.

FIG. 2 is a schematic diagram illustrating the backlight device and the transformer of FIG. 1.

3 is a schematic view showing a backlight device and a transformer adopted by the backlight device according to the first embodiment of the present invention.

4 is a schematic view showing a backlight device and a transformer adopted by the backlight device according to another embodiment of the present invention.

5 is a schematic view showing a backlight device and a transformer adopted by the backlight device according to the second embodiment of the present invention.

6 is a schematic view showing a backlight device and a transformer adopted by the backlight device according to the third embodiment of the present invention.

7 is a schematic view showing a backlight device and a transformer adopted by the backlight device according to the fourth embodiment of the present invention.

Claims (16)

delete delete delete delete delete delete delete delete Power module; A first lamp; And Including a transformer, The transformer is: A bobbin comprising a low voltage winding region, a high voltage winding region, and a first pin thereon, wherein the high voltage winding region has a first separator plate, the first pin coupled with the first lamp; A primary winding wound around the low voltage winding region and coupled to the power module; A secondary winding wound around the high voltage winding region, one end of which is electrically connected to the first pin; A first conductive plate disposed inside the first separator and electrically connected to the first pin; And And a second conductive plate disposed in the first separation plate and positioned to correspond to the first conductive plate to form a first capacitor together with the first conductive plate. 10. The backlight device of claim 9, wherein the bobbin further comprises a second pin, the second conductive plate is electrically connected to the second pin, and the second pin is coupled to a passive component and a protective feedback circuit. . 10. The method of claim 9, further comprising a second lamp, wherein the transformer further comprises a third conductive plate and a fourth conductive plate, the bobbin further comprises a third pin, the third pin is the secondary winding Is electrically connected to the other end of the third pin, the third pin is coupled to the second lamp, the high voltage winding region further has a second separator plate, and the third conductive plate is disposed inside the second separator plate, The third conductive plate is electrically connected to the third pin, the fourth conductive plate is disposed inside the second separator plate, and the fourth conductive plate forms a second capacitor together with the third conductive plate. And a backlight device positioned corresponding to the third conductive plate. The backlight device of claim 11, wherein the bobbin further comprises a fourth pin, the fourth conductive plate is electrically connected to the fourth pin, and the fourth pin is coupled to a passive component and a protective feedback circuit. . Power module; A first lamp; A second lamp; And Including a transformer, The transformer is: A low voltage winding region, a first high voltage winding region, a second high voltage winding region, and first and second pins thereon, wherein the first high voltage winding region has a first separator and the second high voltage winding region Has a second separator plate, wherein the first pin is coupled to the first lamp, and the second pin is coupled to the second lamp; A primary winding wound around the low voltage winding region and coupled to the power module; A first secondary winding wound around the first high voltage winding region, and one end of which is electrically connected to the first pin; A second secondary winding wound around the second high voltage winding region, one end of which is electrically connected to the second pin; A first conductive plate disposed inside the first separator and electrically connected to the first pin; A second conductive plate disposed inside the first separating plate and positioned to correspond to the first conductive plate to form a first capacitor together with the first conductive plate; A third conductive plate disposed inside the second separator and electrically connected to the second pin; And And a fourth conductive plate disposed in the second separation plate and positioned to correspond to the third conductive plate to form a second capacitor together with the third conductive plate. The method of claim 13, wherein the bobbin further comprises a third pin and a fourth pin, the second conductive plate is electrically connected to the third pin, and the third pin is a first passive component and a first pin. A fourth feedback plate electrically coupled with the fourth pin, the fourth pin coupled to a second passive component and a second protection feedback circuit. 14. The apparatus of claim 13, further comprising a third lamp and a fourth lamp, wherein the transformer further comprises a fifth conductive plate, a sixth conductive plate, a seventh conductive plate, and an eighth conductive plate, and the bobbin includes: Further comprising a pin and a fourth pin, wherein the third pin is electrically connected to the other end of the first secondary winding, the third pin is coupled to the third lamp, the fourth pin is the second secondary Is electrically connected to the other end of a winding, the fourth pin is coupled to the fourth lamp, the first high voltage winding region further has a third separator plate, and the second high voltage winding region further has a fourth separator plate. The fifth conductive plate may be disposed in the third separator, the fifth conductive plate may be electrically connected to the third pin, and the sixth conductive plate may be disposed in the third separator. The sixth conductive plate is positioned corresponding to the fifth conductive plate to form a third capacitor together with the fifth conductive plate, The seventh conductive plate is disposed inside the fourth separator plate, the seventh conductive plate is electrically connected to the fourth pin, and the eighth conductive plate is disposed inside the fourth separator plate. And an eighth conductive plate corresponding to the seventh conductive plate to form a fourth capacitor together with the seventh conductive plate. The method of claim 15, wherein the bobbin further comprises a fifth pin and a sixth pin, wherein the sixth conductive plate is electrically connected to the fifth pin, and the fifth pin is a first passive component and a first pin. Coupled to a protective feedback circuit, wherein the eighth conductive plate is electrically connected to the sixth pin, and the sixth pin is coupled to a second passive component and a second protective feedback circuit.

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