CN107453620B

CN107453620B - High-frequency synchronous rectification switching power supply

Info

Publication number: CN107453620B
Application number: CN201710813557.0A
Authority: CN
Inventors: 黄瑞炉; 周勇
Original assignee: Jiangxi Liyuan Haina Technology Co ltd
Current assignee: Jiangxi Liyuan Haina Technology Co ltd
Priority date: 2017-09-11
Filing date: 2017-09-11
Publication date: 2023-06-09
Anticipated expiration: 2037-09-11
Also published as: CN107453620A

Abstract

The invention provides a high-frequency synchronous rectification switching power supply, which comprises: the device comprises a case, a first rectifying module, a second rectifying module, a chopping module, a transformer, a first polar plate, a second polar plate, a first heat dissipation channel and a second heat dissipation channel; the transformer is arranged between the first heat dissipation channel and the second heat dissipation channel; according to the high-frequency synchronous rectification switch power supply, the transformer is arranged between the first heat dissipation channel and the second heat dissipation channel, and other parts needing heat dissipation are arranged between the first heat dissipation channel and the second heat dissipation channel and/or between the first heat dissipation channel and the case and/or between the second heat dissipation channel and the case, so that two ends of the transformer with larger heat productivity can dissipate heat, the heat dissipation efficiency of the transformer is improved, the heat dissipation inside the case is uniform, and a local high-temperature area is not easy to occur.

Description

High-frequency synchronous rectification switching power supply

Technical Field

The invention relates to the technical field of power supply devices, in particular to a high-frequency synchronous rectification switching power supply.

Background

The high-frequency switch rectifying power supply is a device for converting alternating current in a power grid into direct current by adopting a high-frequency inversion principle, and the structure of a power supply module has decisive influence on the performance, the cost, the application range and the like of the power supply; the excellent module structure design needs to meet the following principles: (1) the circuit is in accordance with the basic topology of the circuit, and the current flow direction is smooth and reasonable; (2) the strong current part and the weak current part in the module are separated as far as possible, so that the electromagnetic compatibility is good and the safety is good; (3) the conductive busbar and the conductive cable are as short as possible, so that the loss can be reduced, and the consumption of conductive metal is reduced; (4) on the premise of ensuring good heat dissipation, the volume is as small as possible, and the manufacturing and using cost is reduced; (5) the method is suitable for various current levels and has good expansibility.

Chinese patent document CN202652046U discloses a high-power high-frequency synchronous rectification switching power supply assembly structure, which comprises a chassis, and a conductive double-hole busbar, a transformer, a circuit board and a control trigger circuit which are installed in the chassis; the two conductive double-hole bus bars are inserted in the case in parallel, one end of each conductive double-hole bus bar is connected with the control trigger circuit, and the other end of each conductive double-hole bus bar is led out of the case; the transformers are fixed between two parallel conductive double-hole bus bars, and the surface of the transformers is fixedly provided with a circuit board, wherein the circuit board consists of a rectifier bridge module circuit board, a switching tube circuit board and a synchronous rectifier circuit board; the switching tube of the switching tube circuit board is an insulated gate bipolar transistor; the synchronous rectification circuit board is provided with an electric field effect transistor, the drain electrode of the electric field effect transistor is tightly pressed on a conducting strip of the transformer, the source electrode of the electric field effect transistor is welded on a U-shaped conducting strip of the synchronous rectification circuit board, and the grid electrode of the electric field effect transistor is welded on the synchronous rectification circuit board; the control trigger circuit is arranged in a shielding iron box at the front part of the case. The technical proposal disclosed in the patent document has simple and clear structure, reduces the interference of electromagnetic fields on lines and devices, and is convenient for installation, disassembly and maintenance; however, the heat dissipation effect is poor.

The Chinese patent document CN102280988A discloses an electrochemical high-frequency switching power supply output rectifier with an air-cooled radiating system, which comprises a radiating system, a rectifying diode module, a transformer and positive and negative copper blocks, wherein the radiating system comprises two first radiating bottom plates and second radiating bottom plates which are oppositely arranged, the upper parts of the two radiating bottom plates are connected through a first aluminum plate and a second aluminum plate, and the middle parts of the two radiating bottom plates are connected through copper radiating fins; the rectifier diode module is fixedly arranged on the first radiating bottom plate and the second radiating bottom plate; the transformer is arranged on the first aluminum plate and the second aluminum plate; the positive electrode copper block is connected with the first radiating bottom plate and the second radiating bottom plate, and the negative electrode copper block is arranged above the positive electrode copper block through an insulating pad; the technical scheme has the defects that: 1. the whole structure of the power supply is unreasonable in design, the transformer is a part for producing a large amount of heat, but the transformer is arranged on one side of the heat dissipation air duct in the technical scheme, and after the external shell is installed, the other side of the heat dissipation air duct is easy to form a local high-temperature area; 2. the power supply working principle of the scheme is that the power grid alternating current is firstly transformed, then rectification output is carried out through the rectification diode arranged on the heat dissipation air duct, the needed transformer is large in size, and meanwhile, rectification loss is also large due to the fact that the diode is adopted.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that in the prior art, a transformer is easy to form a high-temperature region on one side, so that the heat dissipation effect is poor, and therefore, the high-frequency synchronous rectification switching power supply with reasonable overall structure layout and uniform heat dissipation is provided, and a local high-temperature region is not easy to appear.

In order to solve the above technical problems, the present invention provides a high-frequency synchronous rectification switching power supply, including: the device comprises a case, a first rectifying module, a second rectifying module, a chopping module, a transformer, a first polar plate, a second polar plate, a first heat dissipation channel and a second heat dissipation channel;

the first heat dissipation channel is arranged in the case and is provided with a first inlet and a first outlet, and at least one of the first inlet and the first outlet is communicated with the space outside the case;

the second heat dissipation channel is arranged inside the case, is opposite to the first heat dissipation channel, and is provided with a second inlet and a second outlet, and at least one of the second inlet and the second outlet is communicated with the space outside the case;

the transformer is arranged between the first heat dissipation channel and the second heat dissipation channel;

the input end of the first rectifying module is directly or indirectly connected with a power grid, and the output end of the first rectifying module outputs direct current;

the input end of the chopper module is directly or indirectly electrically connected with the output end of the first rectifying module, and the output end outputs high-frequency alternating current;

the input end of the transformer is electrically connected with the output end of the chopper module, and the output end of the transformer outputs the transformed alternating current;

the input end of the second rectifying module is electrically connected with the output end of the transformer, and the output end of the second rectifying module outputs direct current;

the first polar plate or the second polar plate is electrically connected with the output end of the second rectifying module.

Preferably, the input end of the first rectifying module is indirectly and electrically connected with the power grid through an electromagnetic interference filter.

Preferably, the input end of the chopper module is indirectly and electrically connected with the output end of the first rectifying module through an inductor.

Preferably, the transformer is connected with at least one of the first heat dissipation channel and the second heat dissipation channel in an insulating manner.

Preferably, one end of the transformer is directly or indirectly fixedly connected with a first side wall of the first heat dissipation channel, which is positioned on one side close to the second heat dissipation channel.

Preferably, the first polar plate is provided with a first section positioned in the case and a second section extending outwards from the case, and the first section is abutted against a first side wall of the first heat dissipation channel, which is positioned on one side close to the second heat dissipation channel.

Preferably, one end of the transformer is fixedly connected with the first section and indirectly fixedly connected with the first heat dissipation channel.

Preferably, the other end of the transformer is directly or indirectly fixedly connected with a second side wall of the second heat dissipation channel, which is positioned close to one side of the first heat dissipation channel.

Preferably, the transformer has a plurality of transformers arranged along the extending direction of the first heat dissipation channel or the second heat dissipation channel.

The heat dissipation device further comprises at least one first diversion heat dissipation plate, wherein the first diversion heat dissipation plate is arranged inside the first heat dissipation channel and fixedly connected with the first side wall.

Preferably, the heat dissipation device further comprises at least one second diversion heat dissipation plate, wherein the second diversion heat dissipation plate is arranged inside the second heat dissipation channel and is fixedly connected with at least one of the two third side walls connected with the second side wall.

Preferably, the first rectifying module is mounted on the first heat dissipation channel or the second heat dissipation channel.

Preferably, the first rectifying module is mounted on the first heat dissipation channel and located on a fourth side wall far away from the second heat dissipation channel.

Preferably, the second rectifying module is mounted on the first heat dissipation channel or the second heat dissipation channel.

Preferably, the second rectifying module is mounted on the second heat dissipation channel and located on the third side wall.

Preferably, the second rectifying modules have a plurality of groups, and are mounted on at least one of the two third side walls.

As a preferable scheme, the chopper module comprises an insulated gate bipolar transistor and an IGBT driving plate, and the second rectifying module comprises an insulated gate field effect transistor and a synchronous driving plate;

the IGBT driving plate is in signal connection with the insulated gate bipolar transistor;

the synchronous driving plate is in signal connection with the insulated gate type field effect transistor;

and the IGBT driving plate is in signal connection with the synchronous driving plate.

Preferably, the source electrode and the drain electrode of the insulated gate field effect transistor are respectively attached to the third side wall of the second heat dissipation channel, and an insulating heat conduction material is isolated between the source electrode and/or the drain electrode and the third side wall.

Preferably, a first inductor is provided on the second segment portion of the first pole plate adjacent to the first segment.

Preferably, the second polar plate is attached to the outer wall of the second heat dissipation channel, and one end of the second polar plate extends out of the case.

Preferably, the second plate includes:

a heat transfer plate attached to an outer wall of the second heat dissipation channel;

one end of the extension plate is positioned in the case and is parallel to the heat transfer plate, and the other end of the extension plate extends out of the case;

one end of the connecting plate is fixedly connected with the heat transfer plate, and the other end of the connecting plate is fixedly connected with the extending plate.

As a preferable scheme, a second inductor is sleeved on the connecting plate;

and/or a third inductor is sleeved on the part, located between the chassis and the connecting plate, of the extending plate.

Preferably, a shielding box is arranged in the case, and the shielding box is used for accommodating a control trigger circuit of the high-frequency synchronous rectification switching power supply.

Preferably, a fan is arranged at the outlet end of the first heat dissipation channel and/or the second heat dissipation channel.

As a preferable scheme, insulating plates are arranged on the inner walls of the two ends of the case.

The technical scheme of the invention has the following advantages:

1. according to the high-frequency synchronous rectification switch power supply, the transformer is arranged between the first heat dissipation channel and the second heat dissipation channel, and other parts needing heat dissipation are arranged between the first heat dissipation channel and the second heat dissipation channel and/or between the first heat dissipation channel and the case and/or between the second heat dissipation channel and the case, so that two ends of the transformer with larger heat productivity can dissipate heat, the heat dissipation efficiency of the transformer is improved, the heat dissipation inside the case is uniform, and a local high-temperature area is not easy to occur.

2. The high-frequency synchronous rectification switch power supply comprises two rectification modules and a chopper module, wherein the first rectification module can rectify the power grid alternating current into direct current at first, then the chopper module converts the direct current into high-frequency alternating current, the volume of a transformer required by high-frequency alternating current transformation is smaller, the whole volume of the switch power supply is reduced, and finally the second rectification module rectifies and outputs the alternating current transformed by the transformer.

3. According to the high-frequency synchronous rectification switching power supply, the IGBT driving plate for driving the chopping module is in signal connection with the synchronous driving plate for driving the second rectification module, so that synchronous driving of the chopping module and the second rectification module is realized.

4. According to the high-frequency synchronous rectification switch power supply, the chopping module, the first rectification module or the second rectification module are arranged on the first heat dissipation channel or the second heat dissipation channel, so that heat can be effectively dissipated.

5. According to the high-frequency synchronous rectification switch power supply, the chopping module and the first rectification module are arranged on the top wall of the first heat dissipation channel in parallel, and the second rectification module is arranged on the side wall of the second heat dissipation channel, so that the space of the first heat dissipation channel and the space of the second heat dissipation channel can be effectively utilized.

6. According to the high-frequency synchronous rectification switching power supply, the source electrode and the drain electrode of the insulated gate type field effect transistor can be attached to the second heat dissipation channel through the insulated heat conducting material, so that the insulated gate type field effect transistor can be effectively dissipated.

7. According to the high-frequency synchronous rectification switch power supply, the first diversion heat dissipation plate is arranged in the first heat dissipation channel and is connected with the inner top wall of the first heat dissipation channel, so that the top wall of the first heat dissipation channel can be better subjected to heat dissipation, and the chopping module and the first rectification module which are positioned on the top wall of the first heat dissipation channel can be subjected to effective heat dissipation; meanwhile, a second diversion heat dissipation plate is arranged in the second heat dissipation channel and is connected with two inner side walls of the second heat dissipation channel, so that the two side walls of the second heat dissipation channel can be better dissipated, and the second rectification module located on the side wall of the second heat dissipation channel can effectively dissipate heat.

8. The high-frequency synchronous rectification switch power supply provided by the invention provides the installation positions of a plurality of transformers and can effectively dissipate heat of the plurality of transformers at the same time.

9. The high-frequency synchronous rectification switch power supply provided by the invention provides the mounting positions of the plurality of second rectification modules and can effectively dissipate heat of the plurality of second rectification modules at the same time.

10. According to the high-frequency synchronous rectification switch power supply, the first polar plate is attached to the outer wall of the first heat dissipation channel, so that the internal structure of the switch power supply is more compact, and the heat dissipation of the first polar plate is facilitated; providing a mounting location for a first inductor on the first plate, the first inductor being capable of impeding a change in current; the mounting position of the transformer is provided on the first polar plate, and a threaded hole for mounting the transformer and the like are not required to be arranged on the first heat dissipation channel, so that the transformer is convenient to mount.

11. According to the high-frequency synchronous rectification switch power supply, the second polar plate is attached to the outer wall of the second heat dissipation channel, so that the internal structure of the switch power supply is more compact, and the heat dissipation of the second polar plate is facilitated.

12. The invention relates to a high-frequency synchronous rectification switch power supply, a second polar plate is I-shaped and consists of a heat transfer plate, a connecting plate and an extending plate, the connecting plate is positioned in the middle, the heat transfer plate is abutted against a second heat dissipation channel, a position for installing a second inductor is arranged on the connecting plate, a position for installing a third inductor is arranged on the extending plate, and the second inductor and the third inductor can block the change of current; the second pole plate is arranged in an I shape, so that the distance between the second pole plate and the first pole plate can be increased, and the safe output is ensured.

13. The high-frequency synchronous rectification switch power supply of the invention is provided with the control trigger circuit in the shielding box of the chassis, thereby not only preventing dust, but also preventing electromagnetic interference.

14. According to the high-frequency synchronous rectification switching power supply, forced ventilation can be carried out in the heat dissipation channel through the fan, and heat exchange efficiency is improved.

15. The high-frequency synchronous rectification switch power supply isolates the case from an internal power supply through the insulating plate, and prevents human body from electric shock.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of the internal three-dimensional structure of a case of the high-frequency synchronous rectification switching power supply of the invention.

Fig. 2 is a front view of fig. 1.

Fig. 3 is a cross-sectional view taken along A-A in fig. 2.

Fig. 4 is a schematic diagram of a high frequency synchronous rectification switching power supply of the present invention.

Fig. 5 is a schematic perspective view of a first heat dissipation channel.

Fig. 6 is a schematic perspective view of a second heat dissipation channel.

Fig. 7 is a schematic perspective view of a transformer mounted on a first pole plate.

Reference numerals illustrate:

1. a chassis; 2. a transformer; 3. a first plate; 4. a second polar plate; 5. a first heat dissipation channel; 6. a second heat dissipation channel; 7. a first rectifying module; 8. a chopper module; 9. a second rectifying module; 10. a control trigger circuit; 11. a first inductor; 12. a second inductor; 13. a third inductor; 14. a heat transfer plate; 15. a connecting plate; 16. a protruding plate; 17. a shielding box; 18. a first diversion heat dissipation plate; 19. an insulating plate; 20. an insulating thermally conductive material; 21. a first inlet; 22. a first outlet; 23. a second inlet; 24. a second outlet; 25. a fan; 26. the second diversion heat dissipation plate; 27. a first sidewall; 28. a first section; 29. a second section; 30. a second sidewall; 31. a third sidewall; 32. and a fourth sidewall.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; the connection can be mechanical connection or connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.

Example 1

As shown in fig. 1, 2 and 3, the high-frequency synchronous rectification switching power supply includes: the transformer comprises a case 1, a transformer 2, a first polar plate 3, a second polar plate 4, a first heat dissipation channel 5, a second heat dissipation channel 6, a first rectifying module 7, a chopper module 8, a second rectifying module 9 and a fan 25.

Insulating plates 19 are arranged on the inner walls of the two ends of the case 1; a shielding box 17 is arranged in the case 1, and the shielding box 17 is used for accommodating a control trigger circuit 10 of the high-frequency synchronous rectification switching power supply.

As shown in fig. 5 and 7, the plurality of transformers 2 are arranged in parallel between the first heat dissipation path 5 and the second heat dissipation path 6 along the extending direction of the first heat dissipation path 5 and the second heat dissipation path 6; one end of the transformer 2 is fixedly connected with a first side wall 27 of the first heat dissipation channel 5, which is positioned close to the second heat dissipation channel 6, through a first polar plate 3.

As shown in fig. 7, the side wall of the transformer 2, which is close to the first heat dissipation channel 5, is attached to the side wall of the first polar plate 3, which is far away from the first heat dissipation channel 5, the other two side walls of the side wall of the transformer 2, which are connected with the side wall of the first polar plate 3, are connected with connecting plates, and the other end of each connecting plate is connected with the other two side walls of the side wall of the first polar plate 3, which are connected with the side wall of the transformer 2.

As shown in fig. 5, the first plate 3 is attached to the first side wall 27 of the first heat dissipation path 5.

As shown in fig. 6, the bottom of the transformer 2 is fixedly connected with a second side wall 30 of the second heat dissipation channel 6, which is located near the first heat dissipation channel 5, and an insulating heat dissipation rubber pad may be disposed between the transformer 2 and the second side wall 30.

As shown in fig. 7, the first pole plate 3 has a first section 28 located inside the case 1, and a second section 29 protruding outward from the case 1, the first section 28 being abutted against a first side wall 27 of the first heat dissipation path 5 located on a side close to the second heat dissipation path 6, and the first pole plate 3 being provided with a first inductor 11 on a side close to the transformer 2.

The second pole plate 4 is attached to the outer wall of the bottom of the second heat dissipation channel 6, and one end of the second pole plate extends out of the case 1; the second pole plate 4 includes: a heat transfer plate 14, a connection plate 15, and an extension plate 16; the heat transfer plate 14 is abutted against the outer wall of the second heat dissipation channel 7; the connecting plate 15 radially extends out of the second heat dissipation channel 6, and one end of the connecting plate 15 is connected with the heat transfer plate 14; the extending plate 16 is connected with the other end of the connecting plate 15, and one end extends out of the case 1; the connecting plate 15 and the extending plate 16 are respectively sleeved with a second inductor 12 and a third inductor 13.

The first heat dissipation path 5 is installed inside the cabinet 1, and has a first inlet 21 and a first outlet 22 communicating with the cabinet exterior space.

The second heat dissipation channel 6 is installed inside the chassis 1 and parallel to the first heat dissipation channel 5, and has a second inlet 23 and a second outlet 24 communicating with the external space of the chassis.

The input end of the first rectifying module 7 is connected with a power grid, and the output end of the first rectifying module is connected with the input end of the chopping module 8.

The chopper module 8 comprises an insulated gate bipolar transistor and an output end of an IGBT driving plate, and the chopper module 8 is connected with an input end of the transformer 2 and is used for converting the rectified direct current into high-frequency alternating current.

The second rectifying module 9 comprises an insulated gate field effect transistor and a synchronous drive plate, the input end of the second rectifying module 9 is connected with the output end of the transformer 2, and the output end is connected with one of the first polar plate 3 or the second polar plate 4; the second rectifying modules 9 are provided with a plurality of groups and are symmetrically and parallelly arranged on two side walls of the second heat dissipation channel 7; and the IGBT driving plate is in signal connection with the synchronous driving plate.

The chopper module 8 and the first rectifying module 7 are installed on the top wall of the first heat dissipation channel 5 in parallel, and the second rectifying module 9 is installed on the side wall of the second heat dissipation channel 6.

As shown in fig. 3, a first heat dissipation plate 18 is disposed in the first heat dissipation channel 5, and the first heat dissipation plate 18 has a plurality of parallel plates connected to the top wall of the first heat dissipation channel 5.

As shown in fig. 3, a second heat dissipation plate 26 is disposed in the second heat dissipation channel 6, and the second heat dissipation plate 26 has a plurality of parallel plates and is connected to two side walls of the second heat dissipation channel 6.

The source electrode and the drain electrode of the insulated gate field effect transistor are respectively attached to the second heat dissipation channel 6, and an insulating heat conduction material 20 is isolated between the source electrode and/or the drain electrode and the second heat dissipation channel 6.

The fan 25 is disposed at the outlet ends of the first heat dissipation path 5 and the second heat dissipation path 6.

Principle of operation

As shown in fig. 4, according to the working principle of the high-frequency synchronous rectification switching power supply, 380V alternating current of a power grid is rectified through a first rectification module, the rectified direct current is chopped into high-frequency alternating current through a chopping module, the high-frequency alternating current is transformed through a transformer, and finally the high-frequency alternating current is rectified into direct current again through a second rectification module and is output through a polar plate; in the process that the chopper module chops the rectified direct current into high-frequency alternating current, the IGBT driving plate of the chopper module sends signals to the synchronous driving plate of the second rectifier module, and the second rectifier module rectifies the transformed alternating current according to the signals of the synchronous driving plate, so that the chopping of the chopper module and the rectification synchronization of the second rectifier module are realized.

As an alternative to the above embodiment, the insulating plates 19 on the inner walls of both ends of the cabinet 1 may be omitted or the inner and outer walls may be insulated with a certain distance.

As an alternative to the above embodiments, the fan may be omitted.

As an alternative to the above embodiments, the shielding cage may be omitted.

As an alternative to the above-described embodiment, one of the second inductor 12 and the third inductor 13 may be omitted, or all of them may be omitted.

As an alternative to the above embodiments, the second plate may be just one plate.

As an alternative to the above embodiment, the second plate may not be attached to the outer wall of the second heat dissipation channel 6, or may be connected with an insulating heat dissipation material.

As an alternative to the above-described embodiment, the first inductor 11 may be omitted.

As an alternative to the above embodiment, only one end of the source and the drain of the insulated gate field effect transistor may be abutted against the second heat dissipation channel 6, and the insulating and heat conducting material 20 may be omitted.

As an alternative to the above embodiments, the chopper module 8 may be replaced with other circuits and elements capable of chopping direct current into high frequency alternating current.

As an alternative to the above-described embodiment, the second rectifying module 9 may have only one group.

As an alternative to the above embodiment, the second rectifying module 9 may be mounted at a position other than the third side wall 31.

As an alternative to the above embodiment, the second rectifying module 9 may be mounted on the first heat dissipation path or on the second heat dissipation path 6 at other positions than the third side wall 31.

As an alternative to the above-described embodiment, the second rectifying module 9 may not be mounted on the first heat dissipation path and the second heat dissipation path.

As an alternative to the above embodiment, the first rectifying module 7 may be mounted on the second heat dissipation path, or mounted on the first heat dissipation path 5 at a position other than the fourth side wall 32.

As an alternative to the above embodiment, the first rectifying module 7 may not be mounted on the first heat dissipation path and the second heat dissipation path.

As an alternative to the above embodiment, the first and second heat-guiding and radiating

plates

18 and 26 may be omitted.

As an alternative to the above-described embodiment, the transformer 2 may have only one.

As an alternative to the above embodiment, one end of the transformer 2 may be directly connected to the second heat dissipation channel 6, or the insulating heat dissipation material may be indirectly connected, or not connected.

As an alternative to the above embodiment, one end of the transformer 2 may be directly connected to the first heat dissipation channel 5, or the insulating heat dissipation material may be indirectly connected, or not connected; but the two ends of the transformer 2 are not directly connected with the first heat dissipation channel 5 and the second heat dissipation channel 6 at the same time.

As an alternative to the above embodiment, the first plate 3 and the first heat dissipation channel 5 may be connected with or not connected with an insulating heat dissipation material.

As an alternative to the above embodiment, the input of the chopper module 8 and the output of the first rectifier module 7 may be electrically connected indirectly through an inductor.

As an alternative to the above embodiment, the input of the first rectifying module 7 may be indirectly electrically connected to the power grid through an electromagnetic interference filter.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.

Claims

1. A high frequency synchronous rectification switching power supply, comprising: the transformer comprises a case (1), a first rectifying module (7), a second rectifying module (9), a chopping module (8), a transformer (2), a first polar plate (3), a second polar plate (4), a first heat dissipation channel (5) and a second heat dissipation channel (6);

the first heat dissipation channel (5) is arranged inside the case (1) and is provided with a first inlet (21) and a first outlet (22), and at least one of the first inlet (21) and the first outlet (22) is communicated with the space outside the case;

the second heat dissipation channel (6) is arranged inside the case (1), is opposite to the first heat dissipation channel (5), and is provided with a second inlet (23) and a second outlet (24), and at least one of the second inlet (23) and the second outlet (24) is communicated with the space outside the case;

the transformer (2) is arranged between the first heat dissipation channel (5) and the second heat dissipation channel (6), the second polar plate (4) is attached to the outer wall of the second heat dissipation channel (6), one end of the second polar plate extends out of the case (1), and insulating plates (19) are arranged on the inner walls of the two ends of the case (1);

the input end of the first rectifying module (7) is directly or indirectly connected with a power grid, and the output end of the first rectifying module outputs direct current;

the input end of the chopper module (8) is directly or indirectly electrically connected with the output end of the first rectifying module (7), and the output end outputs high-frequency alternating current;

the input end of the transformer (2) is electrically connected with the output end of the chopping module (8), and the output end of the transformer (2) outputs transformed alternating current;

the input end of the second rectifying module (9) is electrically connected with the output end of the transformer (2), and the output end of the second rectifying module (9) outputs direct current;

the first polar plate (3) or the second polar plate (4) is electrically connected with the output end of the second rectifying module (9).

2. The high frequency synchronous rectification switching power supply according to claim 1, characterized in that the input of the first rectification module (7) is electrically connected indirectly to the power grid via an electromagnetic interference filter.

3. The high frequency synchronous rectification switching power supply according to claim 1, characterized in that the input of the chopper module (8) is electrically connected indirectly to the output of the first rectification module (7) via an inductor.

4. A high frequency synchronous rectification switching power supply according to any one of claims 1-3, characterized in that said transformer (2) is connected insulated from at least one of said first heat dissipation channel (5) and said second heat dissipation channel (6).

5. The high-frequency synchronous rectification switching power supply as claimed in claim 4, wherein one end of the transformer (2) is fixedly connected directly or indirectly with a first side wall (27) of the first heat dissipation channel (5) which is positioned at a side close to the second heat dissipation channel (6).

6. The high-frequency synchronous rectification switching power supply according to claim 5, characterized in that the first pole plate (3) has a first section (28) located inside the cabinet (1) and a second section (29) protruding outwards from the cabinet (1), the first section (28) being abutted against a first side wall (27) of the first heat dissipation channel (5) located on the side close to the second heat dissipation channel (6).

7. The high frequency synchronous rectification switching power supply as claimed in claim 6, wherein one end of said transformer (2) is indirectly fixedly connected to said first heat dissipation channel (5) by being fixedly connected to said first section (28).

8. The high-frequency synchronous rectification switching power supply as claimed in claim 5, characterized in that the other end of the transformer (2) is fixedly connected directly or indirectly to a second side wall (30) of the second heat dissipation channel (6) located on the side close to the first heat dissipation channel (5).

9. The high-frequency synchronous rectification switching power supply according to claim 8, characterized in that the transformer (2) has a plurality, which is arranged along the extension direction of the first heat dissipation channel (5) or the second heat dissipation channel (6).

10. The high-frequency synchronous rectification switching power supply as claimed in claim 8, further comprising at least one first diversion heat dissipation plate (18), wherein the first diversion heat dissipation plate (18) is disposed inside the first heat dissipation channel (5) and is fixedly connected with the first side wall (27).

11. The high-frequency synchronous rectification switching power supply as claimed in claim 10, further comprising at least one second diversion heat dissipation plate (26), wherein the second diversion heat dissipation plate (26) is disposed inside the second heat dissipation channel (6) and is fixedly connected with at least one of two third side walls (31) connected with the second side wall (30).

12. The high frequency synchronous rectification switching power supply according to claim 11, characterized in that the first rectification module (7) is mounted on the first heat dissipation channel (5) or the second heat dissipation channel (6).

13. The high frequency synchronous rectification switching power supply according to claim 12, characterized in that said first rectification module (7) is mounted on a first heat dissipation channel (5) on a fourth side wall (32) remote from said second heat dissipation channel (6).

14. The high frequency synchronous rectification switching power supply according to claim 11, characterized in that the second rectification module (9) is mounted on the first heat dissipation channel (5) or the second heat dissipation channel (6).

15. The high frequency synchronous rectification switching power supply according to claim 14, characterized in that said second rectification module (9) is mounted on said second heat dissipation channel (6) on said third side wall (31).

16. The high frequency synchronous rectification switching power supply according to claim 15, characterized in that said second rectification module (9) has a plurality of groups, mounted on at least one of two said third side walls (31).

17. The high frequency synchronous rectification switching power supply according to claim 16, characterized in that said chopper module (8) comprises an insulated gate bipolar transistor and an IGBT drive plate, said second rectification module (9) comprises an insulated gate field effect transistor and a synchronous drive plate;

18. The high-frequency synchronous rectification switching power supply according to claim 17, characterized in that the source electrode and the drain electrode of the insulated gate field effect transistor are respectively abutted against a third side wall (31) of the second heat dissipation channel (6), and an insulating heat conduction material (20) is isolated between the source electrode and/or the drain electrode and the third side wall (31).

19. The high frequency synchronous rectification switching power supply according to claim 6, characterized in that a first inductor (11) is provided on the portion of the first pole plate (3) which is close to the second section (29) of the first section (28).

20. The high frequency synchronous rectification switching power supply according to claim 1, characterized in that said second polar plate (4) comprises:

a heat transfer plate (14) that is abutted against the outer wall of the second heat dissipation channel (6);

an extension plate (16), one end of which is positioned inside the case (1) and parallel to the heat transfer plate (14), and the other end of which extends out of the case (1);

and one end of the connecting plate (15) is fixedly connected with the heat transfer plate (14), and the other end of the connecting plate is fixedly connected with the extending plate (16).

21. The high-frequency synchronous rectification switching power supply according to claim 20, characterized in that the connection plate (15) is sleeved with a second inductor (12);

and/or a third inductor (13) is sleeved on the part, located between the chassis (1) and the connecting plate (15), of the extending plate (16).

22. The high-frequency synchronous rectification switching power supply according to claim 1, characterized in that a shielding box (17) is arranged in the case (1), and the shielding box (17) is used for accommodating a control trigger circuit (10) of the high-frequency synchronous rectification switching power supply.

23. The high-frequency synchronous rectification switching power supply according to claim 1, characterized in that the outlet end of the first heat dissipation channel (5) and/or the second heat dissipation channel (6) is provided with a fan (25).