CN217388510U

CN217388510U - Module power supply with multi-stage conversion structure

Info

Publication number: CN217388510U
Application number: CN202122364479.5U
Authority: CN
Inventors: 王跃斌; 宋栋梁; 崔荣明
Original assignee: Hawan Electronics Co ltd
Current assignee: Shenzhen Haowen Electronics Co ltd
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2022-09-06
Anticipated expiration: 2031-09-28

Abstract

The utility model relates to a module power supply with a multistage transformation structure, which comprises a bottom plate, a power plate and a control plate which are mutually overlapped; the power board is placed above the bottom board, and the power devices and the magnetic elements of the first conversion module and the second conversion module are arranged on the power board; the control board is arranged above the power board and is used for arranging a component which is used for generating and outputting a control signal in the first conversion module and the second conversion module; the control signals are transmitted to corresponding components on the power board by the control board through the pin header; the magnetic element of the second conversion module is arranged at one end of the power board, and the magnetic element of the first conversion module is arranged at the other end of the power board. Implement the utility model discloses a module power with multistage transform structure has following beneficial effect: the magnetic elements of the conversion modules at all levels have small mutual interference through the arrangement of the positions and the layouts of the magnetic elements.

Description

Module power supply with multi-stage conversion structure

Technical Field

The utility model relates to a power field, more specifically say, relate to a module power with multistage transform structure.

Background

For a module power supply, especially for a module power supply with a small volume, the electrical performance of the module power supply is in a large relationship with the layout of magnetic elements and switching tubes in a circuit besides the connection topology and the control method. With the same connection topology and control method, the layout of the magnetic elements and the switching tubes can be an important factor affecting the performance of the power supply. In the prior art, there is no specific specification for the placement of magnetic elements in a circuit, which in many cases is placed with the layout of the circuit topology, and there is no specific placement location and placement component. Thus, when the number of the magnetic elements is large, especially when the magnetic elements have a multi-stage conversion structure and belong to different functional modules, the random placement of the magnetic elements may cause various interferences, so that the performance of the module power supply is reduced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the present invention is to provide a layout of strictly limited magnetic elements for the above-mentioned wiring layout of the circuit of the prior art without strictly limiting and possibly causing more interference to appear, so that the interference is limited as much as possible and the module power supply with the multi-stage conversion structure is provided.

The utility model provides a technical scheme that its technical problem adopted is: the modular power supply with the multi-stage conversion structure is constructed and comprises a first conversion module and a second conversion module which are connected in series; the first conversion module is used for converting an input voltage into a set voltage and transmitting the set voltage to the second conversion module, and the second conversion module converts the set voltage into an output voltage of the module power supply; the module power supply comprises a bottom plate, a power plate and a control plate which are mutually overlapped; the power board is placed above the bottom board, and the switching devices and the magnetic elements of the first conversion module and the second conversion module are arranged on the power board; the control board is arranged above the power board and is used for arranging a component which is used for generating and outputting a control signal in the first conversion module and the second conversion module; the control signals are transmitted to corresponding components on the power board by the control board through the pin header; the magnetic element of the second conversion module is arranged at one end of the power board, and the magnetic element of the first conversion module is arranged at the other end of the power board.

Furthermore, the first conversion module comprises an interleaved BUCK-BOOST conversion circuit with a wide input voltage range, and the magnetic element of the first conversion module comprises an inductor for the BUCK conversion circuit and an inductor for the BOOST conversion circuit, wherein the two inductors are respectively arranged on two sides of one end of the power board.

Furthermore, the position of the inductor placed on the power board is provided with a notch for accommodating the inductor, a pad with a through hole is arranged on the edge of the notch, the pins of the inductor are inserted and connected with the pad, the inductor is wound by an RM7 magnetic core, and the two pins of the inductor are arranged on the same side of the magnetic core.

Further, the switching device of the first conversion module is disposed on the bottom surface of the power board such that the heat dissipation surface of the switching device contacts or contacts the bottom plate through an insulating heat conduction pad.

Still further, the second conversion module includes a synchronous rectified full bridge conversion circuit that isolates the input and output using a transformer; the transformer is a magnetic element of the second conversion module and is formed by winding an ER23 magnetic core.

Further, the transformer is disposed at a central position of the other end of the power board.

Furthermore, a transformer mounting notch is formed in the center of the other end of the power board, and connecting columns are respectively arranged on two sides of the mounting notch and connected with input or output pins of the transformer; the switching device of the second conversion module comprises four switching tubes, and the switching tubes are arranged on the bottom surface of the power board and are close to the bottom board.

Furthermore, the circuit arranged on the control board comprises a control circuit, a protection circuit, an auxiliary power supply and an input/output capacitor; and the control board transmits a protection control signal, an auxiliary power supply signal and an input/output power signal to the power board through pins respectively arranged on two sides of the magnetic element arrangement position of the second conversion module and at one end of the control board.

Furthermore, an avoiding notch is arranged on the control board and is arranged at a designated position on the control board, so that the control board avoids the magnetic element when being overlapped with the power board.

Further, the bottom plate is made of a metal material and has a bottom plate connection column penetrating through the power plate and fixed and connected with the power plate; and the bottom plate is provided with an insulating heat conduction layer corresponding to the positions of the magnetic elements and the switching devices of the first conversion module and the second conversion module.

Implement the utility model discloses a module power with multistage transform structure has following beneficial effect: because the power devices and the magnetic elements of the multistage conversion module are arranged on the independent power board, the control circuit is arranged on the independent control board, and the control board and the power board carry out signal transmission through the pins which are arranged dispersedly; meanwhile, on the power board, the magnetic elements of the multi-stage conversion module are respectively positioned at different positions, so that the mutual interference is small; therefore, the mutual interference is small through the arrangement of the positions and the layouts of the magnetic elements of the conversion modules at all levels.

Drawings

Fig. 1 is a schematic structural diagram of a module power supply in an embodiment of the present invention having a multi-stage conversion structure;

FIG. 2 is a schematic structural diagram of the power strip housing of the module in the embodiment;

fig. 3 is a schematic diagram of a component distribution structure on the front surface of the power board in the embodiment;

fig. 4 is a schematic diagram of a distribution structure of components on the back surface of the power board in the embodiment;

FIG. 5 is a schematic structural view of the front surface of the control panel in the embodiment;

FIG. 6 is a schematic view showing the position of the control board and the power board combined together in the embodiment;

FIG. 7 is a schematic diagram of the position of the control board, power board and backplane combination in the embodiment;

fig. 8 is a schematic view of the topology of the first inductor and its switching device in the first conversion module in one case of the embodiment;

fig. 9 is a schematic view of the topology of the second inductor and its switching device in the first conversion module in one case of the embodiment;

fig. 10 is a schematic diagram of the topology of the transformer primary of the second conversion module in one case of the embodiment;

fig. 11 is a schematic diagram of the topology of the transformer secondary of the second conversion module in one case of the embodiment.

Detailed Description

The embodiments of the present invention will be further explained with reference to the drawings.

In the embodiment of the modular power supply with the multi-stage conversion structure of the present invention, the modular power supply with the multi-stage conversion structure comprises, in terms of circuit, a first conversion module and a second conversion module which are connected in series; the first conversion module is used for converting an input voltage into a set voltage and transmitting the set voltage to the second conversion module, and the second conversion module converts the set voltage into an output voltage of the module power supply; referring to fig. 8-11, fig. 8-11 are schematic circuit topologies of the module power supply in the embodiment, and detailed descriptions of the switching devices and the magnetic elements in fig. 8-11 are provided later.

As shown in fig. 1 and 2, in the present embodiment, from a specific mechanical or physical structure, the circuit of the module power supply adopts an overlapped spatial layout to meet the requirement of volume, specifically, the module power supply comprises a bottom plate 3, a power plate 2 and a control plate 1 which are overlapped with each other; the power board 2 is placed above the bottom board 3, and the switching devices and magnetic elements of the first conversion module and the second conversion module are arranged on the power board 2; the control board 1 is placed above the power board 2 and is used for arranging components (namely, most of the components except the switch device and the magnetic element, and a proper amount of resistance-capacitance elements and other components are also placed on the power board 2) which are used for generating and outputting control signals in the first conversion module and the second conversion module; the control signal is transmitted from the control board 1 to the corresponding component on the power board 2 through a pin header 5 (see fig. 3); the magnetic element of the second conversion module is arranged at one end of the power board 2, and the magnetic element of the first conversion module is arranged at the other end of the power board 2. In the present invention, fig. 1 shows a side view of the module power supply when the above-described components are assembled without including the housing 4, and fig. 2 shows a spatial position relationship diagram of the components including the housing 4.

As shown in fig. 2, the first conversion module comprises an interleaved BUCK-BOOST conversion circuit with a wide input voltage range, and the magnetic element of the first conversion module comprises an inductor for the BUCK circuit and an inductor for the BOOST circuit (see fig. 8 and 9), and the two inductors are respectively arranged on two sides of one end of the power board 2. The second conversion module comprises a synchronous rectification full-bridge conversion circuit which isolates input and output by using a transformer; the transformer is a magnetic element of the second conversion module (see fig. 10 and 11), and the transformer is disposed at a central position of the other end of the power board 2.

Referring to fig. 3, fig. 3 is a schematic layout diagram of components on the front surface of the power board 2 in the present embodiment. In fig. 3, it can be clearly seen that the two inductors (labeled as the first inductor 22 and the second inductor 23 in fig. 3) are placed on both sides of the left end of the power board 2, and are respectively located above and below the left end of fig. 4, and are separated by a certain distance; the transformer 21 is placed in the middle of the right end of the power board 2 in fig. 3, so that the distribution of the three magnetic elements on the power board 2 is triangular, and the magnetic elements between different conversion modules are separated as much as possible, so that the mutual influence between the magnetic elements is reduced to a small extent; meanwhile, when voltage conversion is carried out, such as boost conversion, buck conversion and isolation conversion, the output of the converter can not return to the input direction, so that the input current and the output current can not mutually induce or influence.

In this embodiment, the position of the inductor on the power board 2 is provided with a notch for accommodating the inductor, the edge of the notch is provided with a pad with a through hole for inserting and connecting the pins of the inductor, the inductor is wound by using an RM7 magnetic core, and the two pins of the inductor are arranged on the same side of the magnetic core, so that the pads are also arranged on the same side of the notch. And the transformer is formed by winding an ER23 magnetic core. And a transformer mounting notch is formed in the center of the other end of the power board, and connecting columns are arranged on two sides of the mounting notch and connected with input or output pins of the transformer. Fig. 4 shows a schematic diagram of the structure and the placement of the components on the back side of the power board 2. In fig. 4, a transformer through hole 24, a first notch 26 and a second notch 25 are respectively disposed at positions where the first inductor 22, the second inductor 23 and the transformer 21 are disposed on the power board 2, and the transformer through hole 24, the first notch 26 and the second notch 25 are respectively used for accommodating the transformer 21, the first inductor 22 and the second inductor 23, so that these components can extend from the front side of the power board 2 to the back side of the power board 2, on one hand, contact with the bottom board 3 or contact through an insulating heat conducting pad is facilitated, and heat dissipation is facilitated; on the other hand, the height of the components on the front surface of the power board 2 can be adjusted conveniently, so that the components can be connected with welding spots or welding pads or connecting columns on the power board 2 conveniently.

Fig. 4 also shows the position of the switching means of the module power supply on the power board 2. In this embodiment, the switching device of the first conversion module is disposed on the bottom surface of the power board 2, so that the heat dissipation surface of the switching device contacts or contacts the bottom plate 3 through an insulating heat conduction pad. In fig. 4, specific positions of the first switching device 93 for switching charging and discharging of the first inductor 22, the first switching device 92 for switching charging and discharging of the second inductor 23, and the transformer switching device 91 for controlling the charging and discharging loop of the transformer 21 are specifically shown. In a simple way, these switching devices are arranged on the rear side of the power board 2, in the vicinity of the magnetic elements which they drive or connect to, respectively. For example, in the present embodiment, the switching device of the second conversion module includes a switching tube and a rectifying tube, which are disposed on the bottom surface of the power board so as to be adjacent to the bottom plate. For example, the transformer switching device 91 and the rectifying tube 911 shown in fig. 4 are placed at different positions on the bottom surface of the power board 2.

Fig. 5 shows the shape of the control board 1 and the component arrangement position of the top surface, and the circuits arranged on the control board 1 comprise a control circuit, a protection circuit, an auxiliary power supply and an input/output capacitor; the control board 1 transmits a protection control signal, an auxiliary power signal, an input/output control signal, and the like to the power board 2 through pin headers 5 (see fig. 3 and 6) respectively disposed at both sides of a magnetic element disposition position of the second conversion module and at one end of the control board 1. That is, the pins 5 are respectively disposed at different positions of the control board 1 and soldered at different positions of the control board 1 through the pin header connection pads 16 disposed at different positions of the control board 1, specifically, different signals are transmitted between the power board 2 and the control board 1 through the pins 5 at different positions, for example, a control signal of a first conversion module can be transmitted through the pin header 5 at one end of the control board 1; and the control and feedback signals of the second transformation module can be transmitted through the pin headers 5 at both sides of the magnetic element arrangement position of the second transformation module, and the like. Furthermore, the control board 1 is provided with escape notches (11, 12, and 13), and the escape notches (11, 12, and 13) are provided at designated positions on the control board, which correspond to the positions of the magnetic elements provided on the power board 2, so that the control board 1 avoids the corresponding magnetic elements when overlapping the power board 2 (i.e., so that the tops of the magnetic elements can be protruded from the control board 1). In addition, the control board 1 is further provided with a control board positioning hole 15 and an input/output terminal 14, the control board positioning hole 15 is matched with a control board positioning column 27 arranged on the power board 2, and the spatial position relation between the control board 1 and the power board 2 in the horizontal position and the vertical position is determined; the input/output terminal 14 passes through the housing 4 during assembly to serve as an input/output connection terminal of the module power supply, and of course, the input/output terminal also includes an adjusting terminal or a setting terminal capable of being externally connected with an adjusting unit. Fig. 6 shows a specific case of the control board 1 and the power board 2 overlapped together, and specific positions of the terminals and the pins can be seen.

In the present embodiment, the chassis base 3 is made of a metal material, and has fixing posts 31 penetrating through the power board 2 and a chassis base connection post 32 connected to the power board 2; the fixing posts 31 and the base plate connecting posts 32 are respectively matched with the base plate fixing holes 28 and the base plate connecting holes 29 in fig. 4, so that the base plate 3 and the power plate 2 are positioned and connected together. The bottom plate 3 is provided with insulating and heat conducting layers (34, 33) corresponding to the positions of the magnetic elements and the switching devices of the first and second conversion modules. Shown in fig. 7 is a partially insulating and thermally conductive layer. In this embodiment, the insulating and heat conducting layer may be a continuous plane, or may be a separate island-shaped insulating and heat conducting layer disposed only at the bottom of the corresponding switch device or magnetic element as shown in fig. 7.

It should be mentioned that in the present invention, the interleaved BUCK-BOOST conversion circuit with wide input voltage range in the prior art can be used for the first conversion module as long as it includes an inductor for the BUCK circuit and an inductor for the BOOST circuit; the circuit of the second conversion module is only required to be an isolation conversion circuit adopting a transformer in the prior art. In connection with the present invention, the magnetic elements and the switching devices of these circuits are placed on the power board 2 and are placed according to the above definition. FIGS. 8-11 are schematic diagrams of the topology of the magnetic elements and switching devices in one instance of this embodiment; fig. 8 and 9 are circuit diagrams of the first inductor 22 and the second inductor 23 and their switching devices, respectively, in the first conversion module, and fig. 8 shows the first inductor 22 (labeled as L1 in fig. 8) and its connected switching device (see the component labeled as first switching device 93 in fig. 4) in fig. 3; fig. 9 shows the second inductor 23 (labeled L2 in fig. 9) and the switching device connected thereto (see the component labeled second switching device 92 in fig. 4) in fig. 3; fig. 10 and 11 are schematic diagrams of the topology of the magnetic elements and the switching devices of the second conversion module, which are expressed by dividing the original into two parts due to the large size of the original, and basically, fig. 10 shows a schematic diagram of the connection of the primary side of the transformer 21 of the second conversion module and the switching devices connected thereto, and fig. 11 shows a schematic diagram of the connection of the secondary side of the transformer 21 of the second conversion module and the switching devices connected thereto; the two nodes a and b in fig. 10 are connected to the two nodes a and b in fig. 11, respectively, to form a topology diagram of the complete second transformation module. In the above fig. 10, the four switching devices shown are the transformer switching devices 91 shown in fig. 4; while the 8 switching devices shown in fig. 11 correspond to the rectifying switching device 911 shown in fig. 4. It should be noted that, the topologies of the magnetic element and the switching device in this embodiment are only given in fig. 8-11, and only for explaining the position where the device is placed as shown in the previous figures, the circuits of the control, driving and the like parts are not shown, and these circuits and driving signals that are not shown can adopt any technical solutions in the prior art that are suitable for this topology. In other cases in this embodiment, the number and type of the magnetic elements and the switching devices may be different from those described above, but the arrangement positions thereof are in accordance with the above definition and on the power board 2.

The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A module power supply with a multi-stage conversion structure is characterized by comprising a first conversion module and a second conversion module which are connected in series; the first conversion module is used for converting input voltage into set voltage and transmitting the set voltage to the second conversion module, and the second conversion module is used for converting the set voltage into output voltage of the module power supply and outputting the output voltage; the module power supply comprises a bottom plate, a power plate and a control plate which are mutually overlapped; the power board is placed above the bottom board, and the switching devices and the magnetic elements of the first conversion module and the second conversion module are arranged on the power board; the control board is arranged above the power board and is used for arranging a component which is used for generating and outputting a control signal in the first conversion module and the second conversion module; the control signals are transmitted to corresponding components on the power board by the control board through the pin header; the magnetic element of the second conversion module is arranged at one end of the power board, and the magnetic element of the first conversion module is arranged at the other end of the power board.

2. The modular power supply with multi-stage conversion structure as claimed in claim 1, wherein the first conversion module comprises an interleaved BUCK-BOOST conversion circuit having a wide input voltage range, and the magnetic element thereof comprises an inductor for the BUCK circuit and an inductor for the BOOST circuit, the two inductors being respectively disposed at both sides of one end of the power board.

3. The modular power supply with the multilevel conversion structure of claim 2, wherein a notch for accommodating the inductor is disposed at a position where the inductor is disposed on the power board, a pad having a through hole is disposed at an edge of the notch for inserting and connecting a pin of the inductor, the inductor is wound by using an RM7 magnetic core, and two pins of the inductor are disposed on a same side of the magnetic core.

4. The modular power supply having a multilevel conversion structure of claim 3, wherein the switching device of the first conversion module is disposed on a bottom surface of the power board such that a heat dissipation surface of the switching device contacts the bottom board through an insulating thermal pad.

5. The modular power supply with multi-stage conversion architecture of claim 1, wherein said second conversion module comprises a synchronous rectified full bridge conversion circuit using a transformer to isolate input and output; the transformer is a magnetic element of the second conversion module and is formed by winding an ER23 magnetic core.

6. The modular power supply with a multilevel conversion structure according to claim 5, wherein the transformer is disposed at a central position of the other end of the power board.

7. The modular power supply with the multilevel conversion structure according to claim 6, wherein a transformer mounting notch is formed in the center of the other end of the power board, and connecting columns are respectively formed on two sides of the transformer mounting notch to be connected with input or output pins of the transformer; the switching device of the second conversion module comprises a switching tube and a rectifying tube, wherein the switching tube and the rectifying tube are arranged on the bottom surface of the power board, so that the heat dissipation surface of the power board is close to the bottom board.

8. The modular power supply with the multi-stage conversion structure according to claim 1, wherein the circuit provided on the control board comprises a control circuit, a protection circuit, an auxiliary power supply and an input/output capacitor; and the control board transmits a protection control signal, an auxiliary power supply signal and an input/output power signal to the power board through pins respectively arranged on two sides of the magnetic element arrangement position of the second conversion module and at one end of the control board.

9. The modular power supply with a multilevel conversion structure according to claim 8, wherein an avoiding notch is provided on the control board, and the avoiding notch is provided at a designated position on the control board so that the control board avoids the magnetic element when overlapping with the power board.

10. The modular power supply with multilevel conversion structure of claim 1, wherein the bottom plate is made of metal material, having a bottom plate connection post passing through the fixing of the power board and connected with the power board; and the bottom plate is provided with an insulating heat conduction layer corresponding to the positions of the magnetic elements and the switching devices of the first conversion module and the second conversion module.