Patent Application
20110254648
1. Field of the Invention
The present invention relates to a movable transformer and a method of installing the same, in particular, to a movable transformer embedded into an opening of a PCB (Printed. Circuit Board) and a method of installing the same.
2. Description of Related Art
As the technology develops, the trends of all kinds of electronic devices have been directed toward miniaturization and light weight. Internal electronic devices also develop toward miniaturization. However, many problems occur in the process of miniaturizing electronic devices.
Take transformers as an example. It has been over a century since transformers were first manufactured by a Hungarian company called GANZ in 1885. Transformers are widely used for a long time and have evolved into many types of transformers. However, the principles are still unchanged. Transformers transfer electrical energy to/from magnetic energy. Two sets of coils are wound on a common iron core. The coil connected to a power terminal is called primary coil, and the coil connected to a load terminal is called secondary coil. Or, the coils can also be called as high voltage coil and low voltage coil based on the voltage magnitude. The primary coil can be the high voltage coil or the low voltage coil depending on the voltage magnitude. When the primary coil is connected to an alternating current power source, the current passing through the coil generates a change in the magnetic flux. The secondary coil at the other end generates alternating current with the same frequency due to induced electromotive force.
Moreover, there are many methods for decreasing occupied space above a PCB by a transformer in the related art. For example, decreasing the size of the transformer. However, the magnetic-energy-storage would be decreased greatly due to the decrease of the size of the transformer. Hence, it is difficult for designer to design a miniaturization transformer with enough magnetic-energy-storage.
In view of the aforementioned issues, the present invention provides a movable transformer and a method of installing the same in order to embed the movable transformer into an opening of a PCB.
To achieve the above-mentioned objectives, the present invention provides a movable transformer embedded into an opening of a PCB, including: a first bobbin unit, a second bobbin unit, a third bobbin unit, a winding unit and a magnetic unit. The second bobbin unit is electrically connected to the PCB. The third bobbin unit is electrically connected to the PCB. The winding unit is disposed around the first bobbin unit, the second bobbin unit and the third bobbin unit. The magnetic unit passes through the first bobbin unit and disposed outside the first bobbin unit. In addition, one side of the first bobbin unit is slidably mated with the second bobbin unit, another side of the first bobbin unit is slidably mated with the third bobbin unit, so that the first bobbin unit is selectively moved from one position above the opening to another position in the opening.
To achieve the above-mentioned objectives, the present invention provides a method of installing a movable transformer, including: providing a PCB, wherein the PCB has a removing portion; electrically connecting the movable transformer to the PCB, wherein the movable transformer has a fixing unit electrically disposed on the PCB, a movable unit disposed above the removing portion and being movable relative to the fixing unit, a magnetic unit jointed with the fixing unit and a winding unit disposed around the fixing unit and the movable unit; fixing the movable transformer on the PCB and removing the removing portion from the PCB in order to form an opening on the PCB; and pressing the movable unit to move downwards the movable unit relative to the fixing unit and receive the movable unit in the opening.
Therefore, one side of the first bobbin unit is slidably mated with the second bobbin unit and another side of the first bobbin unit is slidably mated with the third bobbin unit, so that the first bobbin unit may be moved upwards or downwards between the second bobbin unit and the third bobbin unit and the first bobbin unit may be selectively moved from one position above the opening to another position in the opening. Hence, the present invention not only can decrease the occupied space above the PCB by the movable transformer, but also can maintain original magnetic-energy-storage.
In order to further understand the techniques, means and effects the present invention takes for achieving the prescribed objectives, the following detailed descriptions and appended drawings are hereby referred, such that, through which, the purposes, features and aspects of the present invention may be thoroughly and concretely appreciated; however, the appended drawings are provided solely for reference and illustration, without any intention that they be used for limiting the present invention.
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The second bobbin unit 2 is electrically connected to the PCB P. The third bobbin unit 3 is electrically connected to the PCB P. The winding unit 4 is disposed around the first bobbin unit 1, the second bobbin unit 2 and the third bobbin unit 3. The magnetic unit 5 passes through the first bobbin unit 1 and disposed outside the first bobbin unit 1. In addition, one side of the first bobbin unit 1 is slidably mated with the second bobbin unit 2, another side of the first bobbin unit 1 is slidably mated with the third bobbin unit 3, so that the first bobbin unit 1 is selectively moved from one position above the opening P4 to another position in the opening P4. The present invention provides an example shown as follows:
The first bobbin unit 1 has a first bobbin 10, a through hole 11 passing through the first bobbin 10, a first major retaining structure 12 disposed on one lateral side of the first bobbin 10, and a second major retaining structure 13 disposed on another lateral side of the first bobbin 10. In addition, the first major retaining structure 12 has a plurality of first protrusions 120, and the second major retaining structure 13 has a plurality of second protrusions 130.
The second bobbin unit 2 has a second bobbin 20, a plurality of first conductive pins 21 disposed on a bottom side of the second bobbin 20 and electrically embedded into the PCB P and a first minor retaining structure 22 slidably mated with the first major retaining structure 12. In addition, the second bobbin unit 2 has a plurality of first channels 23 (as shown in
The third bobbin unit 3 has a third bobbin 30, a plurality of second conductive pins 31 disposed on a bottom side of the third bobbin 30 and electrically embedded into the PCB P and a second minor retaining structure 32 slidably mated with the second major retaining structure 13. In addition, the third bobbin unit 3 has a plurality of second channels 33 (as shown in
The winding unit 4 has a first winding portion 40 disposed around the first bobbin 10, a second winding portion 41 extended from the first winding portion 40 to the second bobbin 20 and electrically connected to the first conductive pins 21, and a third winding portion 42 extended from the first winding portion 40 to the third bobbin 30 and electrically connected to the second conductive pins 31. Hence, the second winding portion 41 passes through the first channels 23, and the third winding portion 42 passes through the second channels 33.
The magnetic unit 5 is composed of at least two magnetic cores 50 that are abutted against each other. Each magnetic core 50 has an inner core portion received in the through hole 11 and an outer core portion connected to the inner core portion and covering one part of the first bobbin 10 and the winding unit 4. The two inner core portions of the two magnetic cores 50 are abutted against each other, and the two outer core portions of the two magnetic cores 50 are abutted against each other. In addition, the two magnetic cores 50 are respectively installed on a top side and a bottom side of the first bobbin unit 1. It means the magnetic unit 5 is a vertical type.
The retaining unit 6 has a first retaining structure 60 for fixing each first protrusion 120 in each first groove 220 and a second retaining structure 61 for fixing each second protrusion 130 in each second groove 320. The first retaining structure 60 has a plurality of first retaining portions 600 respectively embedded into the first grooves 220 and respectively abutted against the first protrusions 120, and the second retaining structure 61 has a plurality of second retaining portions 610 respectively embedded into the second grooves 320 and respectively abutted against the second protrusions 130. Hence, the first bobbin unit 1 may be tightly fixed between the second bobbin unit 2 and the third bobbin unit 3 by using the first retaining portions 600 and the second retaining portions 610.
The above-mentioned descriptions merely represent solely the preferred embodiments of the present invention, without any intention or ability to limit the scope of the present invention which is fully described only within the following claims. Various equivalent changes, alterations or modifications based on the claims of present invention are all, consequently, viewed as being embraced by the scope of the present invention.
