WO2020034183A1 - Integrated transformer and integrated switching power supply application circuit applying integrated transformer - Google Patents

Abstract

An integrated transformer (100) and an integrated switching power supply application circuit containing the integrated transformer, the integrated transformer comprising a closed magnetic core (10), a first winding (20), a second winding (30), a third winding (80), a fourth winding (90), a first skeleton (40), and a second skeleton (50); the closed magnetic core comprises a first magnetic post (101) and a second magnetic post (102) that are arranged in parallel opposite to each other; the first skeleton sleeves the first magnetic post, and the first winding is wound about the first skeleton, while the second skeleton sleeves the second magnetic post, and the second winding is wound about the second skeleton; the third winding is wound about the first magnetic post and is disposed at an interval from the first winding, and the fourth winding is wound about the second magnetic post and is disposed at an interval from the second winding; the first winding comprises a first primary winding (201) and a first secondary winding (202), and the second winding comprises a second primary winding (301) and a second secondary winding (302); the first primary winding is used for introducing a first current (L1), and the second primary winding is used for introducing a second current (L2), the first current and the second current being used to form a magnetic flux loop in the closed magnetic core. The described integrated transformer solves the technical problem wherein two transformers being used in parallel occupies a large space.

Description

Integrated transformer and integrated switching power supply application circuit using the integrated transformer Technical field

The present application relates to the field of transformers, and in particular, to an integrated transformer and an integrated switching power supply application circuit for a new energy vehicle using the integrated transformer.

Background technique

With the rapid development of new energy vehicles and the increase of cruising range, the charging power requirements, voltage requirements, and current requirements of chargers are also becoming higher and higher. In traditional solutions, increasing the output power generally uses two transformers in parallel. It is realized that when two transformers are used in parallel to output in a charger, the size of the charger is large and the process is complicated. At the same time, traditional chargers and DC-DC (DC-DC converters) are also arranged separately using two sets of independent conversion circuits or applied to the entire vehicle through physical integration. This independent arrangement also results in chargers and DC -DC occupies a large space, and the design cost is high.

Application content

The purpose of this application is to provide an integrated transformer and an integrated switching power supply application circuit using the integrated transformer, which not only solves the large-volume technology of the charger caused by using two transformers in parallel to increase the output power in the traditional solution. The problem also solves the technical problem that the charger and the DC-DC use two sets of independent conversion circuits to be separately arranged or physically integrated, which causes the charger and the DC-DC to occupy a large space and have a high design cost. This application has a very broad application prospect.

The present application provides an integrated transformer, which includes a closed magnetic core, a first winding, a second winding, a third winding, a fourth winding, a first skeleton, and a second skeleton. The closed magnetic core includes parallel and oppositely disposed first cores. A magnetic pillar and a second magnetic pillar, the first skeleton is sleeved on the first magnetic pillar, the first winding is wound on the first skeleton, and the second skeleton is sleeved on the second magnetic pillar The second winding is wound on the second bobbin; the third winding is wound on the first magnetic post and is spaced from the first winding, and the fourth winding is wound on The second magnetic column is disposed at a distance from the second winding; the first winding includes a first primary winding and a first secondary winding, and the first primary winding and the first secondary winding The winding is wound using a sandwich method; the second winding includes a second primary winding and a second secondary winding, and the second primary winding and the second secondary winding are wound using a sandwich method; the first The primary winding is used to pass a first current, and the second primary winding is used to pass a second current, The first current and the second current are used to form a magnetic flux loop in the closed magnetic core.

The closed magnetic core further includes a first horizontal post and a second horizontal post, and the first magnetic post and the second magnetic post are both clamped between the first horizontal post and the second horizontal post. And both ends of the first magnetic post and the second magnetic post are connected to the first horizontal post and the second horizontal post.

The distance between the first skeleton and the second skeleton is greater than a threshold distance.

This application provides an integrated switching power supply application circuit. The circuit includes the integrated transformer, the first power storage module, the second power storage module, the primary circuit, the first secondary circuit, and the second secondary circuit.

The first primary winding is connected to the second primary winding to form a primary winding component, and the first secondary winding is connected to the second secondary winding to form a first secondary winding component. Forming a second secondary winding component after the third winding is connected with the fourth winding;

A first end of the primary circuit is used for connection with an external circuit, a second end of the primary circuit is connected with the primary winding component, and a first end of the first secondary circuit is connected with the first The secondary winding component is connected, the second end of the first secondary circuit is connected to the first power storage module, and the first end of the second secondary circuit is connected to the second secondary winding component. A second end of the second secondary circuit is connected to the second power storage module.

The external circuit includes an external power supply circuit and an external load circuit. In a case where the external circuit includes an external power supply circuit and an external load circuit, the circuit includes the following working modes, which will be described in detail below.

First, the current of the external power supply circuit enters the primary side circuit, and the primary side circuit radiates electric energy to the primary side winding component and the first secondary side winding component of the integrated transformer. The first secondary circuit further charges the first power storage module.

Second, the current of the external power supply circuit enters the primary side circuit, and the primary side circuit radiates electric energy to the primary side winding component and the second secondary side winding component of the integrated transformer. The second secondary circuit further charges the second power storage module.

Third, the current of the first power storage module enters the first secondary circuit, and the first secondary circuit passes the first secondary winding component and the primary winding component of the integrated transformer. The electric energy is radiated to the primary circuit, and then the external load circuit is discharged.

Fourth, the current of the first power storage module enters the first secondary circuit, and the first secondary circuit passes the first secondary winding component and the second secondary of the integrated transformer. The winding assembly radiates electric energy to the second secondary circuit, thereby charging the second power storage module.

Wherein, the integrated transformer further includes a primary inductance, the primary inductance is formed by a leakage inductance of the integrated transformer, and the primary inductance is used for being connected in series with the first primary winding and the first primary winding. The two primary windings are electrically connected, or are used to electrically connect the first primary winding and the second primary winding after being connected in parallel.

The distance between the first winding and the third winding is adjustable, and the distance between the second winding and the fourth winding is adjustable.

In summary, the first magnetic column, the first skeleton, the first primary winding, the first secondary winding, and the third winding correspond to a single transformer. The second magnetic column, the second skeleton, the second primary winding, the second secondary winding, and the fourth winding correspond to another separate transformer. In addition, the first current flowing in the first primary winding and the second current flowing in the second primary winding can form a complete magnetic flux loop in the closed magnetic core. Therefore, the integrated transformer of the present application has two transformers. Features. At the same time, the integrated transformer of the present application can form a magnetic flux loop through the first magnetic column, the first horizontal column, the second magnetic column, and the second horizontal column, eliminating the need for the two transformers except the first magnetic column and the second magnetic column. For other than magnetic poles, the integrated transformer of the present application has a small volume. Therefore, the integrated transformer of the present application not only has the functions of two transformers, but also has a small volume after the integration, which solves the technical problem of the larger size of the charger caused by using two transformers in parallel to increase the output power. .

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions in the embodiments of the present application or the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without paying creative labor.

FIG. 1 is a schematic structural diagram of an integrated transformer according to an embodiment of the present application.

FIG. 2 is a schematic exploded view of the integrated transformer shown in FIG. 1.

FIG. 3 is a schematic diagram of a magnetic circuit structure of the integrated transformer shown in FIG. 1.

FIG. 4 is a schematic structural diagram of an integrated circuit according to an embodiment of the present application.

FIG. 5 is a schematic structural diagram of the primary circuit, the first secondary circuit, and the second secondary circuit in FIG. 4.

detailed description

Please refer to FIGS. 1-2. The present application provides an integrated transformer 100 including a closed magnetic core 10, a first winding 20, a second winding 30, a third winding 80, a fourth winding 90, a first skeleton 40 and a second skeleton. 50. The closed magnetic core 10 includes a first magnetic column 101 and a second magnetic column 102 which are arranged in parallel and opposite to each other, a first skeleton 40 is sleeved on the first magnetic column 101, and a first winding 20 is wound on the first skeleton 40. The second frame 50 is sleeved on the second magnetic column 102, and the second winding 30 is wound on the second frame 50. The third winding 80 is wound on the first magnetic column 101 and is spaced apart from the first winding 20; the fourth winding 90 is wound on the second magnetic column 102, and The second winding 30 is disposed at intervals. The first winding 20 includes a first primary winding 201 and a first secondary winding 202, and the first primary winding 201 and the first secondary winding 202 are wound by a sandwich method. The second winding 30 includes a second primary winding 301 and a second secondary winding 302, and the second primary winding 301 and the second secondary winding 302 are wound by a sandwich method. The first primary winding 201 is used to pass a first current L1, the second primary winding 301 is used to pass a second current L2, and the first current L1 and the second current L2 are used to form a magnetic flux in the closed magnetic core 10 Circuit. In this embodiment, the third winding 80 and the fourth winding 90 adopt a copper sheet structure for outputting a low voltage and a large current. The third winding 80 is connected in series with the fourth winding 90. The first skeleton 40 is provided with a first through hole 401, the first magnetic pillar 101 is inserted into the first through hole 401, the second skeleton 50 is provided with a second through hole 501, and the second magnetic pillar 102 is inserted into the second through hole 501 in.

The closed magnetic core 10 further includes a first cross-pillar 103 and a second cross-pillar 104, and the first magnetic post 101 and the second magnetic post 102 are both sandwiched between the first cross-pillar 103 and the second cross-pillar 104, and the first Both ends of the magnetic column 101 and the second magnetic column 102 are connected to the first horizontal column 103 and the second horizontal column 104. In this embodiment, the first magnetic column 101, the first horizontal column 103, the second magnetic column 102, and the second horizontal column 104 are sequentially connected to form the closed magnetic core 10. In this application, the first magnetic column 101 and the second magnetic column 102 are columnar, and the shapes of the first magnetic column 101 and the second magnetic column 102 are not limited in this application. The first horizontal post 103 and the second horizontal post 104 are approximately hexagonal in shape, and the shapes of the first horizontal post 103 and the second horizontal post 104 are not limited in the present application.

In the present application, the first magnetic column 101, the first skeleton 40, the first primary winding 201, the first secondary winding 202, and the third winding 80 correspond to a single transformer. The second magnetic column 102, the second bobbin 50, the second primary winding 301, the second secondary winding 302, and the fourth winding 90 correspond to another separate transformer. The first current L1 flowing in the first primary winding 201 and the second current L2 flowing in the second primary winding 301 can form a complete magnetic flux loop in the closed magnetic core 10, so the integrated transformer 100 of the present application With the function of two transformers, it can output high power. Further, since the traditional two transformers require the first magnetic column 101 and other magnetic columns to form a magnetic flux loop of one of the transformers, the second magnetic column 102 and the other magnetic columns are also required to form a magnetic flux loop of the other transformer. The integrated transformer 100 of the present application can form a magnetic flux loop through the first magnetic column 101, the first horizontal column 103, the second magnetic column 102, and the second horizontal column 104, eliminating the need to remove the first magnetic column 101 and the first magnetic column. Since the other magnetic poles other than the two magnetic poles 102 are used, the integrated transformer 100 of the present application has a small volume. Therefore, the integrated transformer 100 of the present application not only has the functions of two transformers, but also has a small volume after integration, which solves the technology that takes up a large amount of space due to the large volume of two transformers connected in parallel after use. problem.

Further, since the integrated transformer 100 of the present application omits the other magnetic columns of the conventional two transformers except the first magnetic column 101 and the second magnetic column 102, the first winding 20 and the first winding 20 wound on the first frame 40 are Most of the area of the second winding 30 wound on the second frame 50 is exposed to the outside, and the heat generated by the first winding 20 and the second winding 30 can be conducted to the outside faster by itself, which accelerates the first winding 20 and the second winding 30. Heat dissipation of the winding 30.

Since the first magnetic column 101 is housed in the first frame 40 and the second magnetic column 102 is housed in the second frame 50, the heat generated on the first magnetic column 101 and the second magnetic column 102 is not easy to dissipate, but the first magnetic column The column 101 and the second magnetic column 102 are both connected to the first cross column 103 and the second cross column 104, and the first cross column 103 and the second cross column 104 are exposed, and the first magnetic column 101 and the second magnetic column are exposed. The heat on 102 can be transmitted to the first cross-pillar 103 and the second cross-pillar 104, and the heat can be conducted to the outside through the first cross-pillar 103 and the second cross-pillar 104. Therefore, the first cross-pillar 103 and the second cross-pillar 104 realize heat dissipation of the closed magnetic core 10.

Therefore, the integrated transformer 100 of the present application not only solves the technical problem of taking up a large space due to the large volume of the two transformers used together, but also solves the closed magnetic core 10, the first winding 20 and the second Heat dissipation problem of the winding 30.

Please refer to FIG. 3. In a specific implementation manner of the present application, the winding manner of the first winding 20 on the first skeleton 40 is the same as that of the second winding 30 on the second skeleton 50, that is, the first primary side. The winding manner of the winding 201 on the first skeleton 40 is the same as that of the second primary winding 301 on the second skeleton 50, and the winding manner of the first secondary winding 202 on the first skeleton 40 is the same as that of the second primary winding 301. The winding manner of the secondary winding 302 on the second frame 50 is the same. The first primary winding 201 includes a first end 201a and a second end 201b disposed opposite to the first end 201a. Correspondingly, the second primary winding 301 includes a third end 301a and a first end disposed opposite to the third end 301a. Four ends 301b, the first end 201a corresponds to the third end 301a, and the second end 201b corresponds to the fourth end 301b. In the first primary winding 201, the first terminal 201a is used as the input terminal of the first current L1, and the second terminal 201b is used as the output terminal of the first current L1; and in the second primary winding 301, the third terminal 301a is used as The output terminal of the second current L2 and the fourth terminal 301b serve as the input terminal of the second current L2. Therefore, in the same winding mode of the first primary winding 201 and the second primary winding 301, the directions of the first current L1 and the second current L2 are opposite, and the direction of the first magnetic flux P1 in the first magnetic column 101 is the same as The direction of the second magnetic flux P2 in the second magnetic column 102 is opposite, so that a complete magnetic flux loop can be formed in the closed magnetic core 10. And after the complete magnetic flux loop is formed in the closed magnetic core 10, current can be generated in the first secondary winding 202, the second secondary winding 302, the third winding 80 and the fourth winding 90. Therefore, the integrated transformer 100 of the present application has the function of two transformers.

Therefore, the integrated transformer 100 of the present application not only solves the technical problem of taking up a large space due to the large volume of the two transformers used together, but also solves the closed magnetic core 10, the first winding 20 and the second Heat dissipation problem of the winding 30.

Please continue to refer to FIG. 2. In this embodiment, the first skeleton 40 and the second skeleton 50 are both hollow cylindrical structures with open ends. The first skeleton 40 includes a first top wall 402, a first bottom wall 403, and A first side wall (not shown in the figure) between the first top wall 402 and the first bottom wall 403. The first top wall 402 and the first bottom wall 403 are vertically oriented from the openings at both ends of the first side wall. It is formed to extend outward to form a first annular groove-like structure. The first winding 20 is wound on the first annular groove-like structure. The first top wall 402 is provided with a first opening (not shown in the figure). The first opening The first wire post 60 extends vertically outward in the direction of the first horizontal pillar 103, and the first winding 20 passes through the first opening and the first wire post 60 communicates with the outside; the second skeleton 50 includes a second top wall 502, a first The two bottom walls 503 and a second side wall (not shown) provided between the second top wall 502 and the second bottom wall 503. The second top wall 502 and the second bottom wall 503 are both formed by the second side wall. The openings at both ends extend vertically outward to form a second annular groove-like structure. The second winding 30 is wound around the second annular groove-like structure, and a second top wall is provided with a first Two openings (not shown in the figure). The second opening extends vertically outward in the direction of the first cross-pillar 103 to form a second wire socket 70. The second winding 30 passes through the second opening and the second wire socket 70 communicates with the outside. In this embodiment, the first winding wall 20 and the third winding 80 are spaced apart by the first top wall 402 to realize the interval setting of the first winding 20 and the third winding 80. The interval between the second winding 30 and the fourth winding 90 is realized by the second top wall 502 to realize the interval setting of the second winding 30 and the fourth winding 90.

The interval between the first skeleton 40 and the second skeleton 50 is larger than a threshold interval. Specifically, since the first winding 20 is wound on the first skeleton 40 and the second winding 30 is wound on the second skeleton 50, the distance between the first skeleton 40 and the second skeleton 50 needs to be set so that the first A winding 20 is spaced from the second winding 30, and the threshold distance is at least the sum of the diameters of the first winding 20 and the second winding 30. The distance between the first skeleton 40 and the second skeleton 50 needs to be greater than the threshold distance, so that the magnetic field is closed. The first winding 20 and the second winding 30 in the core 10 can be spaced, which reduces the short circuit probability of the first winding 20 and the second winding 30. At the same time, although the first winding 20 and the second winding 30 are spaced apart, the distance between the first winding 20 and the second winding 30 is still small, and the integrated transformer 100 can still be guaranteed to have a smaller volume.

Please refer to FIG. 4, this application also provides an integrated switching power supply application circuit, which includes the integrated transformer 100 described above, a first power storage module 120 (such as a vehicle power battery, also called a high-voltage battery), and a second power storage module. 160 (for example, vehicle battery, also known as low-voltage battery), primary side circuit 130 (for example, including common frequency rectification circuit, power factor correction circuit, etc., which is not limited here), first secondary side circuit 140 (for example, including common frequency The rectifier circuit is not limited here, and the second secondary circuit 150 (for example, includes a common frequency rectifier circuit, which is not limited here).

Please refer to FIG. 5, a first primary winding 201 is connected to a second primary winding 301 to form a primary winding assembly 200, and a first secondary winding 202 is connected to a second secondary winding 302 to form a first secondary winding assembly 300. After the third winding 80 is connected to the fourth winding 90, a second secondary winding assembly 400 is formed.

Please refer to FIG. 4-5. The first end of the primary circuit 130 is used to connect to the external circuit 110, the second end of the primary circuit 130 is connected to the primary winding assembly 200, and the first end of the first secondary circuit 140 is connected to The first secondary winding assembly 300 is connected, the second end of the first secondary circuit 140 is connected to the first power storage module 120, the first end of the second secondary circuit 150 is connected to the second secondary winding assembly 400, and the second The second end of the secondary circuit 150 is connected to the second power storage module 160. In this embodiment, the third winding 80 is connected in series with the fourth winding 90 to form a second secondary winding assembly 400.

Specifically, the external circuit 110 includes an external power supply circuit 1101 and an external load circuit 1102.

In the first implementation of the present application, the current of the external power supply circuit 1101 can enter the primary circuit 130, and the primary circuit 130 radiates electric energy to the primary winding component 200 and the first secondary winding component 300 of the integrated transformer 100. The first secondary circuit 140 can further charge the first power storage module 120. In this embodiment, the first power storage module 120 is a power battery.

In the second implementation manner of the present application, the current of the external power supply circuit 1101 can enter the primary circuit 130, and the primary circuit 130 radiates electrical energy to the primary winding assembly 200 and the second secondary winding assembly 400 of the integrated transformer 100. The second secondary circuit 150 can further charge the second power storage module 160. The second power storage module 160 is a storage battery.

In the third implementation manner of the present application, the current of the first power storage module 120 can enter the first secondary circuit 140, and the first secondary circuit 140 passes through the first secondary winding assembly 300 and the primary winding of the integrated transformer 100. The component 200 radiates electric energy to the primary circuit 130 and can discharge the external load circuit 1102.

In a fourth implementation manner of the present application, the current of the first power storage module 120 can enter the first secondary circuit 140, and the first secondary circuit 140 passes through the first secondary winding assembly 300 and the second secondary of the integrated transformer 100. The side winding assembly 400 radiates electric energy to the second secondary side circuit 150, and can further charge the second power storage module 160.

In the present application, the primary circuit 130 is an input circuit of the charger, and is connected to the external power supply circuit 1101. The first secondary circuit 140 can serve as a rectifier circuit of the charger during charging, and can further be the first power storage module 120 (power battery charging. When DC-DC works, the first secondary circuit 140 can be used as the primary circuit, and the second secondary circuit 150 is a rectifier circuit, which provides energy in the reverse direction through the integrated transformer 100 and transfers energy through the second secondary circuit 150. A charging current is supplied to the second power storage module 160 and further to the second power storage module 160 (battery). At the same time, the first power storage module 120 (power battery) can also discharge the external load circuit 1102, that is, the primary side circuit 130 serves as the secondary side circuit, and the first secondary side circuit 140 serves as the primary side circuit, transferring energy to the external load circuit. 1102, further discharging the external load circuit 1102. Further, the external power supply circuit 1101 can directly supply power to the second power storage module 160 (battery) through the primary circuit 130 and the second secondary circuit 150.

Therefore, the integrated switching power supply application circuit of the present application has four power supply modes, and is mainly aimed at new energy vehicles. The integrated switching power supply application circuit of the present application organically integrates the charger and the DC-DC conversion circuit, and solves the problem caused by the traditional charger and DC-DC using two sets of independent conversion circuits separately arranged or physically integrated. Charger and DC-DC occupy a large space, and the technical cost of design is high.

The integrated transformer also includes a primary inductance (not shown in the figure). The primary inductance is formed by the leakage inductance of the integrated transformer. The primary inductance is used to electrically connect the first primary winding 201 and the second primary winding 301 in series. Connection, or for electrically connecting the first primary winding 201 and the second primary winding 301 after being connected in parallel. Specifically, the integrated transformer of the present application integrates the primary inductor in the integrated transformer, and uses the leakage inductance of the integrated transformer as the primary inductor. The primary inductance may be connected in series with the first primary winding 201 and the second primary winding 301 after being connected in series; the primary inductance may also be connected in series with the first primary winding 201 and the second primary winding 301 after being connected in parallel.

The distance between the first winding 20 and the third winding 80 is adjustable, and the distance between the second winding 30 and the fourth winding 90 is adjustable. Specifically, when the distance between the first winding 20 and the third winding 80 changes, the leakage inductance between the first winding 20 and the third winding 80 changes, the primary inductance changes, and the second secondary circuit 150 And the output power of the second winding 150 can be adjusted by adjusting the distance between the first winding 20 and the third winding 80; the distance between the second winding 30 and the fourth winding 90 can be adjusted. When the change occurs, the leakage inductance between the second winding 30 and the fourth winding 90 changes, the primary inductance changes, and the output power of the second secondary circuit 150 changes, which can be adjusted by adjusting the second winding 30 and the fourth winding. The distance between 90 and 90 is used to adjust the output power of the second secondary circuit 150. Because the third winding 80 and the fourth winding 90 of the present application are connected in series, and when the distance between the first winding 20 and the third winding 80 and the fourth winding 90 after the series changes, the output of the second secondary circuit 150 The power changes; when the distance between the second winding 30 and the series-connected third winding 80 and the fourth winding 90 changes, the output power of the second secondary circuit 150 changes.

Referring to FIG. 5, a possible connection manner of the integrated circuit of the present application is shown in FIG. 5.

The primary circuit 130 includes a first capacitor C1 and a first rectifier circuit 170. The first rectifier circuit 170 includes a first switch unit S1, a second switch unit S2, a third switch unit S3, and a fourth switch unit S4. The first terminal of the third switching unit S3 is connected to the first terminal of the first switching unit S1, the first terminal of the first capacitor C1, and the first terminal of the first power storage module 110, and the second terminal of the third switching unit S3 Connected to the first end of the primary winding assembly 200 and the first end of the fourth switching unit S4, the second end of the fourth switching unit S4 is connected to the second end of the second switching unit S2, and the second end of the first capacitor C1 And the second end of the first power storage module 110 is connected, the first end of the second switching unit S2 is connected to the second end of the first switching unit S1 and the second end of the primary winding assembly 200. In this embodiment, the first primary winding 201 of the primary winding assembly 200 and the second primary winding 301 are connected in series. The first end of the first primary winding 201 is connected to the second end of the third switching unit S3 and the first end of the fourth switching unit S4. The second end of the first primary winding 201 is connected to the second primary winding 301. The first end is connected, and the second end of the second primary winding 301 is connected to the second end of the first switching unit S1 and the first end of the second switching unit S2. The connection mode of the first primary winding 201 and the second primary winding 301 may also be connected in parallel, as discussed below.

The first secondary circuit 140 includes a second capacitor C2 and a second rectifier circuit 180. The second rectifier circuit 180 includes a fifth switch unit S5, a sixth switch unit S6, a seventh switch unit S7, and an eighth switch unit S8. The first terminal of the switching unit S5 is connected to the first terminal of the seventh switching unit S7, the first terminal of the second capacitor C2, and the first terminal of the second power storage module 120. The second terminal of the fifth switching unit S5 is connected to the first terminal. The first end of a secondary winding assembly 300 is connected to the first end of the sixth switching unit S6, the second end of the sixth switching unit S6 is connected to the second end of the eighth switching unit S8, and the second end of the second capacitor C2 And the second end of the second power storage module 120 is connected, the first end of the eighth switching unit S8 is connected to the second end of the seventh switching unit S7 and the second end of the first secondary winding assembly 300. In this embodiment, the first secondary winding 202 of the first secondary winding assembly 300 and the second secondary winding 302 are connected in parallel. The first end of the first secondary winding 202 is connected to the first end of the second secondary winding 302, the second end of the seventh switching unit S7, and the first end of the eighth switching unit S8; The second end is connected to the second end of the second secondary winding 302, the second end of the fifth switching unit S5, and the first end of the sixth switching unit S6. The connection manner of the first secondary winding 202 and the second secondary winding 302 of the first secondary winding component 300 may also be connected in series, as discussed below.

The second secondary circuit 150 includes a first transistor D1, a second transistor D2, and a third capacitor C3. The first terminal of the third winding 80 and the first terminal of the first transistor D1, and the second terminal of the third winding 80 and the third terminal 80. The first end of the four windings 90 and the second end of the third capacitor C3 are connected, the second end of the fourth winding 90 is connected to the first end of the second transistor D2, the second end of the first transistor D1 and the second transistor D2 The second terminal is connected to the first terminal of the third capacitor C3.

Optionally, the switching unit may be, for example, a relay or a switching circuit composed of a field effect transistor. By controlling the voltage of the gate of the field effect transistor to control the on-off between the source and the drain, a field effect is used. The switching circuit of the tube has the characteristics of less interference to the circuit, so that it can generate a larger interference signal to the circuit than the traditional switch, which reduces the interference signal generated by the switching circuit to the circuit to a certain extent, and further Increased the stability of the circuit to a certain extent.

In the present application, there are two ways to connect the first primary winding 201 and the second primary winding 301 of the primary winding assembly 200, the first secondary winding 202 and the second secondary of the first secondary winding assembly 300. There are two connection modes of the winding 302, and there are four connection modes of the integrated transformer.

In the first connection mode of the winding, the first primary winding 201 and the second primary winding 301 are connected in series, and the first secondary winding 202 and the second secondary winding 302 are connected in parallel. Specifically, in the case where there is a high voltage demand on the primary winding of the transformer and a high current demand on the secondary winding of the transformer, the number of turns of the primary winding increases after the first primary winding 201 and the second primary winding 301 are connected in series. Correspondingly, the total voltage across the first primary winding 201 and the second primary winding 301 increases, and since the number of turns of the first secondary winding 202 and the second secondary winding 302 in parallel does not increase, the first The voltage on one secondary winding 202 and the second secondary winding 302 remains unchanged, which is lower than the high voltage on the primary winding, but after the first secondary winding 202 and the second secondary winding 302 are connected in parallel The total current will increase.

In the second connection mode of the winding, the first primary winding 201 and the second primary winding 301 are connected in parallel, and the first secondary winding 202 and the second secondary winding 302 are connected in series. Specifically, in the case where there is a high current demand for the transformer primary winding and a high voltage demand for the transformer secondary winding, the number of turns of the primary winding after the first primary winding 201 and the second primary winding 301 are connected in parallel is not the same. Correspondingly, the voltages on the first primary winding 201 and the second primary winding 301 remain unchanged, but the total current of the first primary winding 201 and the second primary winding 301 increases in parallel, and because the first The number of turns of one secondary winding 202 and the second secondary winding 302 in series increases, and the voltage on the first secondary winding 202 and the second secondary winding 302 increases, which is high compared to the voltage on the primary winding .

In the third connection mode of the winding, the first primary winding 201 and the second primary winding 301 are connected in series, and the first secondary winding 202 and the second secondary winding 302 are connected in series. Specifically, in the case where there is a high voltage demand on the primary winding of the transformer and a high voltage demand on the secondary winding of the transformer, because the number of turns of the first primary winding 201 and the second primary winding 301 in series increases, the first After the secondary winding 202 and the second secondary winding 302 are connected in series, the number of turns increases. Accordingly, the total voltage of the first primary winding 201 and the second primary winding 301 increases, and the first secondary winding 202 and the second secondary winding 302 increase. The total voltage on the side winding 302 increases.

In the fourth connection mode of the winding, the first primary winding 201 is connected in parallel with the second primary winding 301, and the first secondary winding 202 is connected in parallel with the second secondary winding 302. Specifically, in a case where there is a high current demand for the transformer primary winding and a high current demand for the transformer secondary winding, since the number of turns of the first primary winding 201 and the second primary winding 301 in parallel does not increase, The number of turns of the first secondary winding 202 and the second secondary winding 302 in parallel has not increased, so the voltage on the first primary winding 201 and the second primary winding 301 has not changed, and the first secondary winding 202 and the second The voltage on the secondary winding 302 has not changed, but the total current of the first primary winding 201 and the second primary winding 301 in parallel increases, and the total current of the first secondary winding 202 and the second secondary winding 302 in parallel Increase.

The above disclosure is only the preferred embodiments of this application, and of course, the scope of rights of this application cannot be limited by this. Those skilled in the art can understand all or part of the process of implementing the above embodiments, and make according to the claims of this application. The equivalent changes are still covered by the application.

Claims (12)

An integrated transformer is characterized in that it includes a closed magnetic core, a first winding, a second winding, a third winding, a fourth winding, a first skeleton, and a second skeleton. The closed magnetic core includes parallel and oppositely disposed first magnetic cores. A magnetic column and a second magnetic column, the first skeleton is sleeved on the first magnetic pillar, the first winding is wound on the first skeleton, and the second skeleton is sleeved on the second magnet On the post, the second winding is wound on the second skeleton; the third winding is wound on the first magnetic post and is spaced from the first winding, and the fourth winding is wound On the second magnetic column and spaced from the second winding; the first winding includes a first primary winding and a first secondary winding, and the first primary winding and the first secondary winding The side winding is wound using a sandwich method; the second winding includes a second primary winding and a second secondary winding, and the second primary winding and the second secondary winding are wound using a sandwich method; A primary winding is used to pass a first current, and the second primary winding is used to pass a second current. The first current and the second current for the closed loop magnetic flux is formed in the magnetic core. The integrated transformer according to claim 1, wherein the closed magnetic core further comprises a first horizontal post and a second horizontal post, and the first magnetic post and the second magnetic post are clamped between the first magnetic post and the second magnetic post. Between the first horizontal post and the second horizontal post, and both ends of the first magnetic post and the second magnetic post are connected to the first horizontal post and the second horizontal post. The integrated transformer according to claim 2, wherein a distance between the first skeleton and the second skeleton is greater than a threshold interval. An integrated switching power supply application circuit, wherein the circuit comprises: the integrated transformer according to claim 1, a first power storage module, a second power storage module, a primary circuit, a first secondary circuit, and a first Secondary circuit The first primary winding is connected to the second primary winding to form a primary winding component, and the first secondary winding is connected to the second secondary winding to form a first secondary winding component. Forming a second secondary winding component after the third winding is connected with the fourth winding; A first end of the primary circuit is used for connection with an external circuit, a second end of the primary circuit is connected with the primary winding component, and a first end of the first secondary circuit is connected with the first The secondary winding component is connected, the second end of the first secondary circuit is connected to the first power storage module, and the first end of the second secondary circuit is connected to the second secondary winding component. A second end of the second secondary circuit is connected to the second power storage module. The integrated switching power supply application circuit according to claim 4, wherein the closed magnetic core further comprises a first horizontal post and a second horizontal post, and the first magnetic post and the second magnetic post are both clamped Between the first horizontal post and the second horizontal post, and both ends of the first magnetic post and the second magnetic post are connected to the first horizontal post and the second horizontal post . The integrated switching power supply application circuit according to claim 5, wherein a distance between the first skeleton and the second skeleton is greater than a threshold interval. The integrated switching power supply application circuit according to claim 4, wherein the external circuit comprises an external power supply circuit and an external load circuit, and a current of the external power supply circuit enters the primary circuit, and the primary circuit passes The primary winding component and the first secondary winding component of the integrated transformer radiate electric energy to the first secondary circuit, thereby charging the first power storage module. The integrated switching power supply application circuit according to claim 7, characterized in that the current of the external power supply circuit enters the primary circuit, and the primary circuit passes the primary winding component of the integrated transformer and the primary circuit. The second secondary winding component radiates electric energy to the second secondary circuit, and further charges the second power storage module. The integrated switching power supply application circuit according to claim 8, characterized in that the current of the first power storage module enters the first secondary circuit, and the first secondary circuit passes through the integrated transformer. The first secondary winding component and the primary winding component radiate electric energy to the primary circuit, and then discharge the external load circuit. The integrated switching power supply application circuit according to claim 9, wherein the current of the first power storage module enters the first secondary circuit, and the first secondary circuit passes the integrated transformer The first secondary winding component and the second secondary winding component radiate electric energy to the second secondary circuit, thereby charging the second power storage module. The integrated transformer according to claim 4, wherein the integrated transformer further comprises a primary-side inductor, the primary-side inductor is formed by a leakage inductance of the integrated transformer, and the primary-side inductor is used to The first primary winding and the second primary winding are electrically connected to each other, or are used to electrically connect the first primary winding and the second primary winding after being connected in parallel. The integrated transformer according to claim 4, wherein a distance between the first winding and the third winding is adjustable, and a distance between the second winding and the fourth winding is adjustable.

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