TWI759242B - Transformer - Google Patents

Abstract

A transformer includes a first magnetic core, a second magnetic core, a first magnetic column, a second magnetic column, 2N pairs of windings. Each of the pairs of windings includes a high voltage winding and a low voltage winding. Each of the pairs of the windings surrounds one of the first and the second magnetic columns. The surrounding direction of the high voltage windings surrounding the firs magnetic core is opposite to the surrounding direction of the high voltage windings surrounding the second magnetic core.

Description

transformer

The present invention relates to a transformer, in particular to a transformer with a plurality of low-voltage side windings.

The transformer is suitable for adjusting the input voltage to the required voltage. In some applications, a transformer is used to convert a high-voltage input voltage to a low-voltage output voltage. Such a transformer includes a high-voltage side coil and a low-voltage side coil, wherein the number of windings of the high-voltage side coil is higher than that of the low-voltage side coil. The high-voltage side coil receives a high-voltage input voltage to generate a magnetic field, and the low-voltage side coil generates a low-voltage output voltage in response to the magnetic field. The voltage ratio of the input voltage to the output voltage corresponds to the turns ratio of the high-voltage side coil and the low-voltage side coil.

In different applications, a single transformer includes multiple sets of high-voltage side coils and low-voltage side coils, and multiple sets of high-voltage side coils and low-voltage side coils are integrated into a single transformer, which is relatively bulky.

In view of this, according to some embodiments, a transformer includes a core set and 2N winding pairs. The magnetic core set includes a first magnetic core, a second magnetic core, and a pair of magnetic columns. The second magnetic core is parallel to the first magnetic core. The magnetic column pair includes a first magnetic column and a second magnetic column, the first magnetic column is substantially parallel to the second magnetic column, the first magnetic column and the second magnetic column are located between the first magnetic core and the second magnetic column between the second cores. The N is a positive integer greater than or equal to 2, each of the winding pairs includes a high-voltage side winding and a low-voltage side winding, and each of the winding pairs surrounds one of the first magnetic column or the second magnetic column, and surrounds one of the first magnetic column or the second magnetic column. A first surrounding direction of the high voltage side windings of the first magnetic column is substantially opposite to a second surrounding direction of the high voltage side windings surrounding the second magnetic column.

According to some embodiments, the high-voltage side windings are connected in series in sequence, each of the low-voltage side windings includes a plurality of low-voltage side sub-windings, and the low-voltage side sub-windings are connected in parallel with each other.

According to some embodiments, the transformer further includes a circuit board, the circuit board includes a plurality of winding layers, each of the winding layers includes a winding, the high-voltage side winding and the low-voltage side winding of at least one of the winding pairs for these windings, respectively.

According to some embodiments, the N is equal to 2, the high-voltage side windings are connected in series in sequence, each of the low-voltage side windings includes a plurality of low-voltage side sub-windings, and the low-voltage side sub-windings are connected in parallel with each other.

According to some embodiments, the winding pairs surrounding the first magnetic column are sequentially a first winding pair, a second winding pair and a third winding pair along a long axis of the first magnetic column, surrounding the first magnetic column The winding pairs of the second magnetic column are sequentially a sixth winding pair, a fifth winding pair and a fourth winding pair along a long axis of the second magnetic column, and the long axis of the first magnetic column Parallel to and in the same direction as the long axis of the second magnetic column, the first pair of windings, the second pair of windings, the third pair of windings, the fourth pair of windings, the fifth pair of windings and the sixth pair of windings The winding pairs are connected in series in sequence.

According to some embodiments, the winding pairs surrounding the first magnetic column are sequentially a first winding pair, a second winding pair and a third winding pair along a long axis of the first magnetic column, surrounding the first magnetic column The winding pairs of the second magnetic column are sequentially a sixth winding pair, a fifth winding pair and a fourth winding pair along a long axis of the second magnetic column, and the long axis of the first magnetic column Parallel to and in the same direction as the long axis of the second magnetic column, the first pair of windings, the sixth pair of windings, the pair of fifth windings, the pair of second windings, the pair of third windings and the pair of fourth windings The high-voltage side windings of the winding pair are connected in series in sequence.

To sum up, according to some embodiments, the transformer includes 2N pairs of windings, and each pair of windings surrounds the first magnetic column or the second magnetic column. With this structure, 2N pairs of windings can be effectively integrated into the magnetic core group including the first magnetic column and the second magnetic column, thereby reducing the volume of the transformer.

Please refer to FIG. 1 , which is a schematic cross-sectional view of a transformer according to some embodiments. The transformer includes a core set 20 and 2N winding pairs 30 . The magnetic core set 20 includes a first magnetic core 22 , a second magnetic core 24 , and a magnetic column pair 26 , 28 . The second magnetic core 24 is parallel to the first magnetic core 22 . The pair of magnetic columns 26, 28 includes a first magnetic column 26 and a second magnetic column 28, the first magnetic column 26 is substantially parallel to the second magnetic column 28, the first magnetic column 26 and the second magnetic column 28 28 is located between the first magnetic core 22 and the second magnetic core 24 . The N is a positive integer greater than or equal to 2 (N in the embodiment of FIG. 1 is equal to 2), each of the winding pairs 32, 34, 36, 38 includes a high-voltage side winding 32H, 34H, 36H, 38H and a low-voltage side winding 32L, 34L, 36L, 38L, each of the pair of windings 32, 34, 36, 38 surrounds one of the first magnetic column 26 and the second magnetic column 28 (ie, surrounds the first magnetic column 26 or the second magnetic column 28). column 28), a first surrounding direction of the high voltage side windings 32H, 36H surrounding the first magnetic column 26 is substantially opposite to a direction of the high voltage side windings 34H, 38H surrounding the second magnetic column 28 The second wraparound direction.

Specifically, the high-voltage side windings 32H, 34H, 36H, and 38H of FIG. 1 are the first high-voltage side winding 32H, the second high-voltage side winding 34H, the third high-voltage side winding 36H and the fourth high-voltage side winding 38H, respectively. From the perspective of FIG. 1 , the (first) surrounding direction of the first high-voltage side winding 32H and the third high-voltage side winding 36H around the first magnetic column 26 is from the right side of the first magnetic column 26 out of the drawing, and from the first magnetic column 26 . The left side of the column 26 enters the drawing; similarly, the (second) surrounding direction of the second high-voltage side winding 34H and the fourth high-voltage side winding 38H around the second magnetic column 28 is from the left side of the second magnetic column 28 out of the drawing, and from the first The second magnetic column 28 enters the drawing on the right. Therefore, the first winding directions of the first and third high-voltage side windings 32H, 36H surrounding the first magnetic column 26 are substantially opposite to the second and fourth high-voltage side windings 34H surrounding the second magnetic column 28, The second wraparound direction of 38H. In some embodiments, the number of the winding pairs 32, 36 surrounding the first magnetic column 26 is the same as the number of the winding pairs 34, 38 surrounding the second magnetic column 28, such as the embodiment of FIG. 1 Among them, the number of the winding pairs 32, 36 surrounding the first magnetic column 26 is two, and the number of the winding pairs 34, 38 surrounding the second magnetic column 28 is also two.

Although the first surrounding direction and the second surrounding direction in the embodiment of FIG. 1 are as described above, the first surrounding direction and the second surrounding direction can also be reversed, that is, the first surrounding direction is from the first magnetic column 26 The drawing goes out from the left and enters the drawing from the right of the first magnetic column 26 , and the second surrounding direction is to pass through the drawing from the right of the second magnetic column 28 and enter the drawing from the left of the second magnetic column 28 . Next, FIG. 1 does not show the surrounding directions of the low-voltage side windings 32L, 34L, 36L, 38L, which means that the surrounding directions of the low-voltage side windings 32L, 34L, 36L, 38L can be determined according to requirements.

Therefore, based on the foregoing embodiment, when the transformer receives alternating current (input voltage), the direction of the magnetic flux generated by the high-voltage side windings 32H, 36H surrounding the first magnetic column 26 is opposite to the direction of the magnetic flux surrounding the second magnetic column 28 The direction of the magnetic flux generated by the high voltage side windings 34H, 38H. Therefore, the transformer forms an annular magnetic circuit by the first magnetic core 22 , the first magnetic column 26 , the second magnetic core 24 and the second magnetic column 28 . The low-voltage side windings 32L, 34L, 36L, and 38L generate corresponding induced currents in response to the magnetic circuit. The induced current passes through the low-voltage side circuit (described later), and the transformer can output the corresponding output voltage. The ratio of the input voltage to the output voltage corresponds to the turns ratio of the high-voltage side windings 32H, 34H, 36H, 38H and the low-voltage side windings 32L, 34L, 36L, 38L.

In some embodiments, the magnetic core set 20 includes only one magnetic column pair 26, 28, and the magnetic column pair 26, 28 is composed of a first magnetic column 26 and a second magnetic column 28, that is, the magnetic column pair 26 , 28 includes only the first magnetic column 26 and the second magnetic column 28 . The high-voltage side windings 32H, 34H, 36H, 38H and the low-voltage side windings 32L, 34L, 36L, 38L surround the corresponding first magnetic column 26 or the second magnetic column 28 . In this way, the 2N winding pair 30 surrounds the two magnetic columns 26, 28, and achieves the effect of voltage conversion, so that the volume of the entire transformer is significantly reduced.

In the embodiment shown in FIG. 1, the first magnetic column 26 includes two first magnetic sub-columns 26a, 26b, and the first magnetic sub-columns 26a, 26b are substantially coaxially disposed on the first magnetic core 22 and the second magnetic column between the cores 24 . The second magnetic column 28 includes two second magnetic sub-columns 28 a, 28 b, and the second magnetic sub-columns 28 a, 28 b are substantially coaxially disposed between the first magnetic core 22 and the second magnetic core 24 . However, the present disclosure is not limited thereto. The first magnetic column 26 and the second magnetic column 28 may each be a single column, as shown in FIG. 4 .

In some embodiments, as shown in FIG. 1, the first sub-column 26a, the first magnetic core 22 and the second sub-column 28a are integrally formed components; the first sub-column 26b, the second magnetic core 24 and the The second sub-columns 28b are integrally formed elements. However, the present disclosure is not limited thereto, and the first magnetic sub-columns 26a, 26b, the second magnetic sub-columns 28a, 28b, the first magnetic core 22, and the second magnetic core 24 may be separate components.

In some embodiments, an annular region is formed by the first magnetic core 22 , the first magnetic column 26 , the second magnetic core 24 and the second magnetic column 28 , and the annular region may be closed or open (non-closed) . For example, the two first magnetic sub-columns 26a, 26b are substantially coaxially disposed with a gap therebetween, and the two second magnetic sub-columns 28a, 28b are substantially coaxially disposed with a gap therebetween. Furthermore, in embodiments where the first sub-columns 26a, 26b, the second sub-columns 28a, 28b, the first magnetic core 22, and the second magnetic core 24 are separate components, adjacent components may be in contact with each other or have a spacing. For example, the first magnetic core 22 and the first sub-magnetic column 26a are in contact with each other or have a space therebetween. The first magnetic core 22 and the second magnetic sub-columns 28a are in contact with each other or have a space therebetween. The second magnetic core 24 is in contact with the first sub-magnetic column 26b or has a space therebetween. The second magnetic core 24 and the second magnetic sub-columns 28b are in contact with each other or have a space therebetween. These spacings can be the same or different.

In the embodiment of FIG. 1 , the outer sides of the first magnetic core 22 and the second magnetic core 24 (the left and right sides in FIG. 1 ) protrude from the outer sides of the 2N winding pairs 30 (the left and right sides in FIG. 1 ), but the present disclosure Not limited to this, the outer sides of the first magnetic core 22 and the second magnetic core 24 can be aligned with the outer sides of 2N winding pairs 30 (the left and right sides of the winding pairs in FIG. the right side) or the outer sides of the pair of magnetic columns 26, 28 (the left and right sides of the pair of magnetic columns in FIG. 1, that is, the left side of the first magnetic column 26 and the right side of the second magnetic column 28).

The aforementioned high-voltage side windings 32H, 34H, 36H, and 38H may be in a series relationship, a parallel relationship, or a series-parallel relationship; the aforementioned low-voltage side windings 32L, 34L, 36L, and 38L may be in a series relationship, a parallel relationship, or a series-parallel relationship. Details will be given later. In addition, the number of 2N winding pairs 30 can also be changed according to the requirements of the transformer (eg, the output current, the number of output ports).

Please refer to FIG. 2 , which is a functional block diagram of a circuit of a transformer according to some embodiments. The transformer includes a high voltage side circuit 90 and a low voltage side circuit 92. In this embodiment, the transformer includes four low voltage side circuits 92a, 92b, 92c, 92d. The high-side circuit 90 is suitable for receiving an input power supply 94, and the input power supply 94 may be a DC power supply (as shown in FIG. 2) or an AC power supply. The high-side circuit 90 is adapted to convert the input power source 94 into a predetermined alternating current and then input it to the high-side windings 32H, 34H, 36H, 38H. After the high-voltage side windings 32H, 34H, 36H, and 38H receive the alternating current, the low-voltage side windings 32L, 34L, 36L, and 38L generate induced currents. The low-voltage side circuits 92a, 92b, 92c, and 92d rectify the induced current and then output it to the load. Each low-voltage side circuit 92a, 92b, 92c, 92d includes a synchronous rectification circuit 98a and a voltage regulator circuit 98b (only the first low-voltage side circuit 92a is shown in FIG. 2 as an example for its detailed circuit), and the synchronous rectification circuit 98a is connected in series with the corresponding The low-voltage side winding 32L and the voltage-stabilizing circuit 98b are connected in parallel with the corresponding low-voltage side winding 32L.

In the embodiment of FIG. 2 , the high-voltage side windings 32H, 34H, 36H, and 38H are connected in series in sequence, and the low-voltage side windings 32L, 34L, 36L, and 38L have independent outputs. It can also be output in parallel to increase its output current.

Please refer to FIG. 3 , which is an exploded perspective view of a copper wire transformer according to some embodiments. As can be seen from the figure, the copper wire transformer contains 2N pairs of windings 32H, 32L, 34H, 34L, 36H, 36L, 38H, 38L, N is equal to 2, the four winding pairs 32H, 32L, 34H, 34L, 36H, 36L , 38H, 38L are wires in the form of copper wires, these wires surround the first sub-magnetic column 26a, 26b or the second sub-magnetic column 28a, 28b correspondingly, and are respectively electrically connected to the high-voltage side circuit 90 and the low-voltage side circuit 92 . The wire in the form of copper wire may be, but not limited to, enameled wire. 3 depicts the high-voltage side windings 32H, 34H, 36H, and 38H as wires with black dotted surfaces, and the low-voltage side windings 32L, 34L, 36L, and 38L as wires with blank surfaces. The drawing method does not represent the high-voltage side. Windings 32H, 34H, 36H, 38H and low-voltage side windings 32L, 34L, 36L, 38L use different wires. In practice, the same or different wires can be used for the high-voltage side windings 32H, 34H, 36H, and 38H and the low-voltage side windings 32L, 34L, 36L, and 38L. The high-voltage side windings 32H, 34H, 36H, and 38H and the low-voltage side windings 32L, 34L, 36L, and 38L are electrically connected to the high-voltage side circuit 90 and the low-voltage side circuit 92, respectively. This copper wire transformer makes the transformer a The volume was significantly reduced. The embodiment of FIG. 3 can realize the transformer of the circuit functional block diagram of FIG. 2 . The present disclosure is not limited to this, the user can adjust the number of the winding pairs 32H, 32L, 34H, 34L, 36H, 36L, 38H, 38L shown in FIG. The electrical connection relationship and the adjustment of the electrical connection relationship between the low-voltage side windings 32L, 34L, 36L, 38L and the low-voltage side circuit 92 are used to realize the embodiment of the transformer of the circuit functional block diagram shown in FIG. 5 , FIG. 7A and FIG. 7B .

Please refer to FIG. 4 , which is an exploded perspective view of a flat-panel transformer according to some embodiments. As can be seen from the figure, the flat-panel transformer includes a first magnetic core 22 , a second magnetic core 24 , a first magnetic column 26 , a second magnetic column 28 , and a circuit board 96 . The circuit board 96 includes two post holes 97a, 97b. The first magnetic column 26 and the second magnetic column 28 are located in the two column holes 97a, 97b, respectively. In this embodiment, the circuit board 96 includes a plurality of winding layers, each winding layer includes a winding, the high-voltage side windings and the low-voltage side windings of the 2N winding pairs 30 are the windings respectively, and the 2N winding pairs 30 correspondingly surrounds the two column holes 97a, 97b (not shown in the figure). With the 2N winding pairs 30 of the flat-panel transformer surrounding only the two-column holes 97a, 97b (ie, 2N winding pairs 30 surrounding the first magnetic column 26 and the second magnetic column 28), the transformer with 2N winding pairs 30 can reduce its overall size.

Please continue to refer to FIG. 5 , which illustrates a functional block diagram of a transformer circuit according to some embodiments. The transformer contains 2N pairs of windings 30, where N is equal to two. The four winding pairs 30 are a first winding pair 32H, 32L1, 32L2, a second winding pair 34H, 34L1, 34L2, a third winding pair 36H, 36L1, 36L2, and a fourth winding pair 38H, 38L1, 38L2, respectively. The first winding pair includes a high-voltage side winding 32H and two low-voltage side windings 32L1 and 32L2 (also referred to as low-voltage side sub-windings), which are named as the first high-voltage side winding 32H and the first low-voltage side windings 32L1 and 32L2, respectively. The same is true for the second, third and fourth winding pairs, and will not be repeated here. Among them, the first and second high-voltage side windings 32H and 34H are connected in series to form a high-voltage side winding string (hereinafter referred to as the first high-voltage side winding string), and the third and fourth high-voltage side windings 36H and 38H are connected in series to form another high-voltage side winding string. (hereinafter referred to as the second high-voltage side winding string), the two high-voltage side windings connected in series are connected in series and parallel (the first high-voltage side winding string and the second high-voltage side winding are connected in series and parallel). The two low-voltage side windings 32L1 and 32L2 corresponding to the same high-voltage side winding 32H are respectively connected to the corresponding synchronous rectification circuit 98a and the voltage regulator circuit 98b. For example, the two first low-voltage side windings 32L1 and 32L2 are respectively connected to the corresponding synchronous rectification circuit. 98a and the corresponding voltage regulator circuit 98b. The outputs of the two synchronous rectifier circuits 98a are connected in parallel. The two synchronous rectifier circuits 98a respectively rectify the positive and negative half-cycle currents output by the corresponding two first low-voltage side windings 32L1 and 32L2 and output them. The low-voltage side circuits 92a, 92b, 92c, and 92d shown in FIG. 5 are center-tapped rectifier circuits.

In the embodiment of FIG. 5, the first, second, third and fourth low-voltage side windings 32L1, 32L2, 34L1, 34L2, 36L1, 36L2, 38L1, 38L2 are connected in parallel, and the paralleled low-voltage side windings output to load 99. In implementation, it is not limited to this. The parallel connected first low-voltage side windings 32L1 and 32L2 can independently output to the corresponding loads, and the parallel connected second, third and fourth low-voltage side windings 34L1, 34L2, 36L1, 36L2 respectively. , 38L1, 38L2 can also independently output to the corresponding load. That is, the outputs of the two low-voltage side windings 32L1 and 32L2 corresponding to the same high-voltage side winding 32H independently provide power to the corresponding loads. The transformer of the functional block diagram shown in Figure 5 can be realized by a flat-panel transformer or a copper wire transformer.

Please refer to FIG. 6 , which is a schematic side view of a flat-panel transformer according to some embodiments. The embodiment of FIG. 6 can realize the circuit block diagram of the transformer of FIG. 5 . The flat panel transformer includes a first magnetic core 22, a second magnetic core 24, a first magnetic column 26 (26a, 26b), a second magnetic column 28 (28a, 28b), and circuit boards 96a, 96b. In this embodiment, the transformer includes two circuit boards 96a, 96b (referred to as a first circuit board 96a and a second circuit board 96b for ease of description). The first circuit board 96a includes first winding pairs 32H, 32L1, 32L2 and second winding pairs 34H, 34L1, 34L2, and the second circuit board 96b includes third winding pairs 36H, 36L1, 36L2 and fourth winding pairs 38H, 38L1, 38L2. A first low-voltage side circuit 92a and a second low-voltage side circuit 92b are respectively disposed on the upper and lower surfaces of the first circuit board 96a. The first low voltage side windings 32L1 and 32L2 are electrically connected to the synchronous rectification circuit 98a and the voltage regulator circuit 98b of the first low voltage side circuit 92a (which can be electrically connected through the vias of the circuit board 96a, the same below, not shown in the figure). The second low voltage side windings 34L1 and 34L2 are electrically connected to the second low voltage side circuit 92b. A third low-voltage side circuit 92c and a fourth low-voltage side circuit 92d are arranged on the upper and lower surfaces of the second circuit board 96b, respectively. The third low voltage side windings 36L1 and 36L2 are electrically connected to the third low voltage side circuit 92c. The fourth low voltage side windings 38L1 and 38L2 are electrically connected to the fourth low voltage side circuit 92d.

FIG. 6 shows the first low-voltage side circuit 92 a between the first circuit board 96 a and the first magnetic core 22 . In some embodiments, the first low-side circuit 92a is located on the upper surface of the first circuit board 96a. In practice, the upper surface area of the first circuit board 96a may be larger than the lower surface area of the first magnetic core 22 , and the first low-voltage side circuit 92a is located where the first circuit board 96a is not covered by the first magnetic core 22 . Therefore, when the first circuit board 96 a is combined with the first magnetic core 22 , the first low-voltage side circuit 92 a is located on the side of the first magnetic core 22 . In this way, the first low-voltage side circuit 92a is not sandwiched between the first circuit board 96a and the first magnetic core 22 . Similarly, the second, third and fourth low-voltage side circuits 92b, 92c, 92d are also the same, and will not be repeated. In some embodiments, the first and second low-side circuits 92a, 92b are not located on the first circuit board 96a, the third and fourth low-side circuits 92c, 92d are not located on the second circuit board 96b, and the low-side circuit 92a , 92b, 92c, 92d are located on one other circuit board or respectively located on a plurality of other circuit boards (not shown in the figure), and the low-voltage side circuits 92a, 92b, 92c, 92d are connected with the low-voltage side by wires (not shown in the figure). The side windings 32L1, 32L2, 34L1, 34L2, 36L1, 36L2, 38L1, and 38L2 are electrically connected.

In the embodiment of FIG. 6, the transformer includes two circuit boards 96a, 96b, but the present disclosure is not limited to this, and the transformer may only include a single circuit board (similar to that shown in FIG. With proper design of wiring and windings, the first, second, third and fourth low-voltage side circuits 92a, 92b, 92c, 92d can be respectively disposed on the upper and lower surfaces of a single circuit board and are electrically connected to the first, second, and first circuit boards respectively. The third and fourth low voltage side windings 32L1, 32L2, 34L1, 34L2, 36L1, 36L2, 38L1, 38L2.

Please refer to FIG. 7A, which illustrates a functional block diagram of a transformer circuit according to some embodiments. In this embodiment, the transformer includes 2N pairs of windings (that is, N is equal to 3, and there are 6 pairs of windings in total), which are the first pair of windings 32H, 32L1, 32L2, the second pair of windings 34H, 34L1, 34L2, and the third pair of windings, respectively. Pair 36H, 36L1, 36L2, fourth winding pair 38H, 38L1, 38L2, fifth winding pair 37H, 37L1, 37L2, and sixth winding pair 39H, 39L1, 39L2. The first high-voltage side winding 32H, the second high-voltage side winding 34H, the third high-voltage side winding 36H, the fourth high-voltage side winding 38H, the fifth high-voltage side winding 37H, and the sixth high-voltage side winding 39H are connected in series in sequence.

The circuit of FIG. 7A is applied to the structure including the first magnetic core 22, the second magnetic core 24, the first magnetic column 26 and the second magnetic column 28 of FIG. 3 or FIG. 4, in some embodiments, surrounding the The number of the winding pairs of the first magnetic column 26 is the same as the number of the winding pairs surrounding the second magnetic column 28, such as the first winding pair 32H, 32L1, 32L2, the second winding pair 34H, 34L1, 34L2 and the third pair of windings 36H, 36L1, 36L2 surround the first magnetic column 26, the fourth pair of windings 38H, 38L1, 38L2, the fifth pair of windings 37H, 37L1, 37L2 and the sixth pair of windings 39H, 39L1, 39L2 surround the second magnetic Column 28, the number of both is 3. In some embodiments, the number of the winding pairs surrounding the first magnetic column 26 is different from the number of the winding pairs surrounding the second magnetic column 28, such as the first winding pairs 32H, 32L1, 32L2, The second winding pair 34H, 34L1, 34L2, the third winding pair 36H, 36L1, 36L2 and the fourth winding pair 38H, 38L1, 38L2 surround the first magnetic column 26, and the number is 4; and the fifth winding pair 37H, 37L1, 37L2 and the sixth winding pair 39H, 39L1, 39L2 surround the second magnetic column 28, the number of which is two.

The transformer includes six low-voltage side circuits 92a, 92b, 92c, 92d, 92e, and 92f, which are respectively a first low-voltage side circuit 92a, a second low-voltage side circuit 92b, a third low-voltage side circuit 92c, a fourth low-voltage side circuit 92d, and a third low-voltage side circuit 92d. The fifth low-voltage side circuit 92e and the sixth low-voltage side circuit 92f. The first low-voltage side windings 32L1 and 32L2 are connected to the first low-voltage side circuit 92a, the second low-voltage side windings 34L1 and 34L2 are connected to the second low-voltage side circuit 92b, and so on, which will not be repeated.

The transformer includes a high voltage side circuit 90 suitable for converting an input power source 94 into a predetermined alternating current and then inputting the series connected high voltage side windings 32H, 34H, 36H, 38H, 37H, 39H. The induced currents of the low-voltage side windings 32L1, 32L2, 34L1, 34L2, 36L1, 36L2, 38L1, 38L2, 37L1, 37L2, 39L1, 39L2 pass through the corresponding low-voltage side circuits 92a, 92b, 92c, 92d, 92e, 92f, six The low-side circuits 92a, 92b, 92c, 92d, 92e, 92f output individually. The outputs of the six low-voltage side circuits 92a, 92b, 92c, 92d, 92e, 92f can be connected in series, in parallel, in series and then in parallel, or in parallel and then in series, depending on the number of loads and the voltage and current required by the loads. The transformer of the functional block diagram shown in FIG. 7A can be implemented by a flat-panel transformer or a copper wire transformer. In some embodiments, the low-side circuits 92a, 92b, 92c, 92d, 92e, 92f are full-wave rectifiers of center-tapped transformers.

Please refer to FIG. 7B, which illustrates a functional block diagram of a transformer circuit according to some embodiments. In this embodiment, the transformer includes 2N pairs of windings (that is, N is equal to 3, a total of 6 pairs of windings), which are the first pair of windings 32H, 32L, the second pair of windings 34H, 34L, and the third pair of windings 36H, 36L. , the fourth winding pair 38H, 38L, the fifth winding pair 37H, 37L, and the sixth winding pair 39H, 39L. The transformer includes six low-voltage side circuits 92m, 92n, 92o, 92p, 92q, 92r, and these low-voltage side circuits 92m, 92n, 92o, 92p, 92q, 92r correspond to the low-voltage side windings 32L, 34L, 36L of these winding pairs, respectively , 38L, 37L, 39L. In some embodiments, the low-voltage side circuits 92m, 92n, 92o, 92p, 92q, and 92r are full bridge rectifier circuits.

Please refer to FIG. 8 , which is a schematic side view of a flat-panel transformer according to some embodiments. The embodiment of FIG. 8 can realize the circuit block diagram of the transformer of FIG. 7A or FIG. 7B . The flat panel transformer includes a first magnetic core 22, a second magnetic core 24, a first magnetic column 26 (26a, 26b), a second magnetic column 28 (28a, 28b), and circuit boards 96a, 96b, 96c. In this embodiment, the transformer includes a first circuit board 96a, a second circuit board 96b and a third circuit board 96c. The first circuit board 96a includes first winding pairs 32H, 32L1, 32L2 and second winding pairs 34H, 34L1, 34L2, and the second circuit board 96b includes third winding pairs 36H, 36L1, 36L2 and fourth winding pairs 38H, 38L1, 38L2, the third circuit board 96c includes a fifth pair of windings 37H, 37L1, 37L2 and a sixth pair of windings 39H, 39L1, 39L2. A first low-voltage side circuit 92a and a second low-voltage side circuit 92b are respectively disposed on the upper and lower surfaces of the first circuit board 96a. The first low voltage side windings 32L1 and 32L2 are electrically connected to the first low voltage side circuit 92a. The second low voltage side windings 34L1 and 34L2 are electrically connected to the second low voltage side circuit 92b. A third low voltage side circuit 92c and a fourth low voltage side circuit 92d are arranged on the upper and lower surfaces of the second circuit board 96b, respectively. The third low voltage side windings 36L1 and 36L2 are electrically connected to the third low voltage side circuit 92c. The fourth low voltage side windings 38L1 and 38L2 are electrically connected to the fourth low voltage side circuit 92d. A fifth low-voltage side circuit 92e and a sixth low-voltage side circuit 92f are arranged on the upper and lower surfaces of the third circuit board 96c, respectively. The fifth low voltage side windings 37L1 and 37L2 are electrically connected to the fifth low voltage side circuit 92e. The sixth low voltage side windings 39L1 and 39L2 are electrically connected to the sixth low voltage side circuit 92f.

Similar to the embodiment of FIG. 6, the low-voltage side circuits 92a, 92b, 92c, 92d, 92e, and 92f of the embodiment of FIG. , 37L2, 39L1, 39L2, the low side circuits 92a, 92b, 92c, 92d, 92e, 92f may be located on the first, second or third circuit boards 96a, 96b, 96c or other circuit boards, respectively.

Please refer to FIG. 9 , which is a schematic cross-sectional view of a transformer according to some embodiments. The transformer includes a first magnetic core 22, a second magnetic core 24, a first magnetic column 26 (26a, 26b), a second sub-magnetic column 28 (28a, 28b), and 2N winding pairs 30 (ie N equals 3, for a total of six winding pairs 30). The pairs of windings surrounding the first sub-columns 26a, 26b are sequentially a first winding pair 32, a A second pair of windings 36 and a pair of third windings 37, the pairs of windings surrounding the second sub-columns 28a, 28b are along a longitudinal axis L2 of the second sub-columns 28a, 28b (hereinafter referred to as the second long axis L2). Axial) are a sixth winding pair 34 , a fifth winding pair 38 and a fourth winding pair 39 in sequence. The long axis L1 (first long axis) of the first sub-columns 26a, 26b and the long axis L2 (second long axis) of the second sub-columns 28a, 28b are parallel and in the same direction. It can be seen in FIG. 9 that the first long axis L1 and the second long axis L2 are the downward directions of the viewing angle of FIG. 9 . In some embodiments, some of the first winding pair 32 , the sixth winding pair 34 , the fifth winding pair 38 , the second winding pair 36 , the third winding pair 37 , and the fourth winding pair 39 The high-voltage side windings 32H, 34H, 38H, 36H, 37H, and 39H are connected in series in sequence. That is, the first high-voltage side winding 32H, the sixth high-voltage side winding 34H, the fifth high-voltage side winding 38H, the second high-voltage side winding 36H, the third high-voltage side winding 37H and the fourth high-voltage side winding 39H are connected in series in sequence. The first low-voltage side winding 32L, the sixth low-voltage side winding 34L, the fifth low-voltage side winding 38L, the second low-voltage side winding 36L, the third low-voltage side winding 37L and the fourth low-voltage side winding 39L can be output independently, output in series, or partially Output in series after parallel connection, or output in parallel after partial series connection, depending on the load. In some embodiments, each winding pair includes a plurality of low-voltage side windings (also referred to as low-voltage side sub-windings). The connection relationship and function are as described above and will not be repeated here.

In some embodiments, the transformer of FIG. 9 is a flat-panel transformer, and the flat-panel transformer includes a plurality of winding layers, and the winding layers are divided into a first layer section, a second layer section and a first layer section from top to bottom (from the perspective of FIG. 9 ). Three layers. Each layer segment contains multiple winding layers. The first winding pair 32 and the sixth winding pair 34 are located in the first layer segment, the second winding pair 36 and the fifth winding pair 38 are located in the second layer segment, and the third winding pair 37 and the fourth winding pair 39 are located in the third layer segment. . The first high-voltage side winding 32H and the sixth high-voltage side winding 34H can be electrically connected by wires or vias on the circuit board. The sixth high-voltage side winding 34H and the fifth high-voltage side winding 38H can be electrically connected through via holes on the circuit board or external wires. The via holes may be plated through holes, blind via holes or buried via holes. And so on for the rest.

According to some embodiments, the first high-voltage side winding 32H, the second high-voltage side winding 36H, and the third high-voltage side winding 37H are connected in series in sequence to form the first high-voltage side winding string 32H, 36H, 37H, the sixth high-voltage side winding 34H, The fifth high-voltage side winding 38H and the fourth high-voltage side winding 39H are connected in series in sequence to form a second high-voltage side winding string 34H, 38H, 39H. The first high-voltage side winding strings 32H, 36H, 37H are connected in parallel with the second high-voltage side winding strings 34H, 38H, 39H.

According to some embodiments, the first high voltage side winding 32H, the second high voltage side winding 36H, the third high voltage side winding 37H, the fourth high voltage side winding 39H, the fifth high voltage side winding 38H and the sixth high voltage side winding 34H are connected in series in sequence.

To sum up, in some embodiments, the transformer includes 2N pairs of windings, and each pair of windings surrounds the first magnetic column or the second magnetic column. With this structure, 2N pairs of windings can be effectively integrated into the magnetic core group including the first magnetic column and the second magnetic column, thereby reducing the volume of the transformer.

20: Magnetic core group 22: The first core 24: The second magnetic core 26,28: Magnetic column pair, first magnetic column, second magnetic column 26a, 26b, 28a, 28b: the first sub-column, the second sub-column 30: winding pair 32,34,36,37,38,39: winding pair, first winding pair, sixth winding pair, second winding pair, third winding pair, fifth winding pair, fourth winding pair 32H, 34H, 36H, 37H, 38H, 39H: High-voltage side windings 32L, 34L, 36L, 37L, 38L, 39L: Low-voltage side windings 32L1, 32L2, 34L1, 34L2, 36L1, 36L2, 37L1, 37L2, 38L1, 38L2, 39L1, 39L2: Low-voltage side winding, low-voltage side sub-winding 90: High voltage side circuit 92, 92a, 92b, 92c, 92d, 92e, 92f: low-voltage side circuit, first low-voltage side circuit, second low-voltage side circuit, third low-voltage side circuit, fourth low-voltage side circuit, fifth low-voltage side circuit, sixth Low side circuit 92m, 92n, 92o, 92p, 92q, 92r: Low side circuit 94: Input power 96, 96a, 96b, 96c: circuit board, first circuit board, second circuit board, third circuit board 97a, 97b: Column hole 98a: Synchronous Rectifier Circuit 98b: Voltage Regulator Circuit 99: load L1, L2: Long axis, first long axis, second long axis

[FIG. 1] shows a schematic cross-sectional view of a transformer according to some embodiments; [FIG. 2] shows a functional block diagram of a transformer circuit according to some embodiments; [FIG. 3] shows an exploded perspective view of a copper wire transformer according to some embodiments; [FIG. 4] shows an exploded perspective view of a flat panel transformer according to some embodiments; [FIG. 5] shows a circuit functional block diagram of a transformer according to some embodiments; [FIG. 6] is a schematic side view of a flat-panel transformer implementing the circuit block diagram of FIG. 5 according to some embodiments; [FIG. 7A] shows a circuit functional block diagram of a transformer according to some embodiments; [FIG. 7B] shows a circuit functional block diagram of a transformer according to some embodiments; [FIG. 8] is a schematic side view of a flat-panel transformer that implements the circuit block diagram of FIG. 7 according to some embodiments; and [FIG. 9] shows a schematic cross-sectional view of a transformer according to some embodiments.

20: Magnetic core group

22: The first core

24: The second magnetic core

26,28: Magnetic column pair, first magnetic column, second magnetic column

26a, 26b, 28a, 28b: the first sub-column, the second sub-column

30: winding pair

32, 34, 36, 38: Winding pairs

32H, 34H, 36H, 38H: High voltage side winding

32L, 34L, 36L, 38L: Low-voltage side winding

Claims (16)

A transformer comprising: A core set, including: a first magnetic core; a second magnetic core, parallel to the first magnetic core; and a magnetic column pair, the magnetic column pair includes a first magnetic column and a second magnetic column, the first magnetic column is substantially parallel to the second magnetic column; wherein the first magnetic column and the second magnetic column are located between the first magnetic core and the second magnetic core; and 2N winding pairs, where N is a positive integer greater than or equal to 2, each of the winding pairs includes a high-voltage side winding and a low-voltage side winding, and each of the winding pairs surrounds the first magnetic column and the second magnetic column. One, a first surrounding direction of the high-voltage side windings surrounding the first magnetic column is substantially opposite to a second surrounding direction of the high-voltage side windings surrounding the second magnetic column. The transformer of claim 1, wherein the high-voltage side windings are connected in series in sequence. The transformer of claim 2, wherein each of the low-voltage side windings includes a plurality of low-voltage side sub-windings, and the low-voltage side sub-windings are connected in parallel with each other. The transformer of claim 1, further comprising a circuit board, the circuit board comprising a plurality of winding layers, each of the winding layers comprising a winding, the high-voltage side windings and the low-voltage side windings are respectively the some windings. The transformer of claim 4, wherein the N is equal to 2, the high-voltage side windings are connected in series in sequence, each of the low-voltage side windings includes a plurality of low-voltage side sub-windings, and the low-voltage side sub-windings are connected in parallel with each other. The transformer of claim 4, wherein each of the low-voltage side windings includes a plurality of low-voltage side sub-windings, and the low-voltage side sub-windings are connected in parallel with each other. The transformer of claim 4, wherein the N is equal to 3, and the winding pairs surrounding the first magnetic column are sequentially a first winding pair and a second winding pair along a long axis of the first magnetic column. A winding pair and a third winding pair, the winding pairs surrounding the second magnetic column are sequentially a sixth winding pair, a fifth winding pair and a fourth winding along a long axis of the second magnetic column Yes, the long axis of the first magnetic column is parallel and in the same direction as the long axis of the second magnetic column, the first winding pair, the second winding pair, the third winding pair, and the fourth winding The high voltage side windings of the pair, the fifth winding pair and the sixth winding pair are connected in series in sequence. The transformer of claim 4, wherein the N is equal to 3, and the winding pairs surrounding the first magnetic column are sequentially a first winding pair and a second winding pair along a long axis of the first magnetic column. A winding pair and a third winding pair, the winding pairs surrounding the second magnetic column are sequentially a sixth winding pair, a fifth winding pair and a fourth winding along a long axis of the second magnetic column Yes, the long axis of the first magnetic column is parallel and in the same direction as the long axis of the second magnetic column, the first winding pair, the sixth winding pair, the fifth winding pair, and the second winding The high voltage side windings of the pair, the third winding pair and the fourth winding pair are connected in series in sequence. The transformer of claim 4, further comprising a high-voltage side circuit and a low-voltage side circuit, wherein the N is equal to 2, and the four winding pairs are respectively a first winding pair, a second winding pair, and a third winding pair A pair of windings and a pair of fourth windings, each pair of windings includes a high-voltage side winding and two low-voltage side windings, the high-voltage side winding of the first winding pair is connected in series with the high-voltage side winding of the second winding pair to form a first A high-voltage side winding string, the high-voltage side winding of the third winding pair and the high-voltage side winding of the fourth winding pair are connected in series to form a second high-voltage side winding string, the first high-voltage side winding string and the second high-voltage side winding string The windings are electrically connected to the high-voltage side circuit after being connected in series and parallel, and the two low-voltage side windings of each pair of windings are respectively electrically connected to the low-voltage side circuit. A transformer as claimed in claim 1, further comprising: a high voltage side circuit electrically connected to the high voltage side windings, the high voltage side circuit is adapted to receive a power source to output an alternating current to the high voltage side windings; and A plurality of low-voltage side circuits are electrically connected to the low-voltage side windings respectively, each of the low-voltage side circuits includes a synchronous rectification circuit and a voltage regulator circuit, each of the synchronous rectification circuits is connected in series with the corresponding low-voltage side winding, each A voltage-stabilizing circuit is connected in parallel with the corresponding low-voltage side winding. The transformer of claim 1, wherein the high-voltage side windings and the low-voltage side windings are conductors in the form of copper wires. The transformer of claim 11, wherein the N is equal to 2, the high-voltage side windings are connected in series in sequence, each of the low-voltage side windings includes a plurality of low-voltage side sub-windings, and the low-voltage side sub-windings are connected in parallel. The transformer of claim 11, wherein each of the low-voltage side windings includes a plurality of low-voltage side sub-windings, and the low-voltage side sub-windings are connected in parallel with each other. The transformer of claim 11, wherein the N is equal to 3, and the winding pairs surrounding the first magnetic column are sequentially a first winding pair and a second winding pair along a long axis of the first magnetic column. A winding pair and a third winding pair, the winding pairs surrounding the second magnetic column are sequentially a sixth winding pair, a fifth winding pair and a fourth winding along a long axis of the second magnetic column Yes, the long axis of the first magnetic column is parallel and in the same direction as the long axis of the second magnetic column, the first winding pair, the second winding pair, the third winding pair, and the fourth winding The high voltage side windings of the pair, the fifth winding pair and the sixth winding pair are connected in series in sequence. The transformer of claim 11, wherein the N is equal to 3, and the winding pairs surrounding the first magnetic column are sequentially a first winding pair and a second winding pair along a long axis of the first magnetic column. A winding pair and a third winding pair, the winding pairs surrounding the second magnetic column are sequentially a sixth winding pair, a fifth winding pair and a fourth winding along a long axis of the second magnetic column Yes, the long axis of the first magnetic column is parallel and in the same direction as the long axis of the second magnetic column, the first winding pair, the sixth winding pair, the fifth winding pair, and the second winding The high voltage side windings of the pair, the third winding pair and the fourth winding pair are connected in series in sequence. The transformer of any one of claims 1 to 15, wherein the number of the winding pairs surrounding the first magnetic column is the same as the number of the winding pairs surrounding the second magnetic column.

Images