CN213183911U

CN213183911U - DC-DC isolation power module

Info

Publication number: CN213183911U
Application number: CN202021537917.2U
Authority: CN
Inventors: 陈恢云
Original assignee: Ningbo Sanxing Electric Co Ltd
Current assignee: Ningbo Sanxing Electric Co Ltd
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2021-05-11
Anticipated expiration: 2030-07-29

Abstract

The utility model relates to a DC-DC keeps apart power module, transformer include PCB board and magnetic core, and the magnetic core includes magnetic core and lower magnetic core, and 4 layers of PCB boards that the PCB board was placed from top to bottom at least all are equipped with the multiturn on every layer of PCB board and walk the line, walk on every layer of PCB board and walk line both ends and all be equipped with the link, walk on the top layer PCB board walk the line and loop through the primary that the link is established ties and is constituteed the transformer with walking on the at least one deck PCB board in middle part, walk on bottom PCB board and the at least one deck PCB board in middle part and walk the line and loop through the secondary that the link is established ties and is constituteed the transformer, go up the magnetic core and contact. In the DC-DC isolated power supply module, the traditional copper wire winding is replaced by routing on the multilayer PCB, so that the volume is reduced; in addition, the isolation voltage value is adjusted through the PCB spacing and the wiring spacing, so that the isolation between the power supplies can be realized.

Description

DC-DC isolation power module

Technical Field

The utility model relates to a power field, in particular to DC-DC keeps apart power module.

Background

The isolation of the current commonly used DC-DC power supply (input and output are direct current power supplies), the isolation of the power supply is basically realized by adopting a high-frequency transformer, the transformer generally comprises a magnetic core and a coil wound on the magnetic core, copper wires with different wire diameters are wound on a special framework for a primary coil and a secondary coil of the transformer according to different input voltages and output voltages, the existing transformer isolation voltage can reach 4KV, the process is mature, but the existing transformer is large in size, high in cost and incapable of miniaturization. The other miniaturized DCDC isolated power supply has small volume, high cost and low output precision, can only achieve +/-5 percent, and can only achieve 1.5KV of isolated voltage.

In order to reduce the volume of the transformer, a chinese patent application No. CN201510701587.3 (application publication No. CN105206404A) discloses a transformer, which includes a base, two E-shaped magnetic cores, an upper shell cover, a lower shell cover, a PCB board with through holes, and a secondary coil; a primary coil is etched on the PCB around the through hole; the upper shell cover and the lower shell cover are respectively provided with a through hole, and the winding post of the E-shaped magnetic core is inserted into the through hole and the through hole; the base is provided with a plurality of first contact pins electrically connected with the secondary coil and a plurality of second contact pins electrically connected with the primary coil; the base comprises a bottom plate and a vertical plate arranged along part of the edge of the bottom plate; the first contact pin is arranged on the vertical plate, and the second contact pin is arranged on the bottom plate; the E-shaped magnetic core is arranged on the bottom plate between the vertical plate and the second contact pin; the vertical plate is provided with a notch, and two ends of the secondary coil penetrate through the notch. Above-mentioned transformer is through locating on the base and two E type magnetic cores of concatenation, locate between two E type magnetic cores and the last cap and the inferior valve lid of concatenation and locate PCB board and secondary coil between last cap and the inferior valve lid, simple structure, the volume is less, but above-mentioned transformer still needs secondary coil's connection, still unable maximum reduction transformer volume, and keeps apart the effect not good, consequently needs further improvement.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to prior art's current situation, provide an keep apart effectual and small DC-DC and keep apart power module.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a DC-DC keeps apart power module, includes direct current input end, direct current output and locates the transformer between direct current input end and the direct current output, the transformer includes PCB board and magnetic core, the magnetic core includes magnetic core and lower magnetic core, its characterized in that: the PCB board is 4 layers of PCBs of placing from top to bottom at least, all be equipped with the multiturn on every layer of PCB board and walk the line, walk on every layer of PCB board line both ends and all be equipped with the link, walk on the top layer PCB board walk the line and loop through the primary coil that the link is established ties and is constituteed the transformer with walking on the at least one deck PCB board in middle part, walk on the at least one deck PCB board in bottom PCB board and the middle part and loop through the link and establish ties and constitute the secondary coil of transformer, go up the magnetic core and contact with the walking of top layer PCB board and bottom PCB board respectively with the magnetic.

In order to reduce the volume of the transformer, the middle PCB in the primary coil of the transformer is arranged at intervals, and the PCB in the middle part, which is closest to the top PCB, is also arranged at intervals with the top PCB.

Similarly, the middle PCBs in the secondary coil of the transformer are arranged at intervals, and the PCB closest to the bottom PCB in the middle is also arranged at intervals with the bottom PCB.

Preferably, the transformer comprises 4 layers of PCBs arranged in sequence from top to bottom, one connecting end of each of the first layer of PCB and the third layer of PCB is connected with one connecting end of each of the wires, the other connecting end of each of the first layer of PCB and the third layer of PCB corresponds to two ends of a primary coil of the transformer, the other connecting end of each of the second layer of PCB and the fourth layer of PCB is connected with one connecting end of each of the wires, and the other connecting end of each of the second layer of PCB and the fourth layer of PCB corresponds to two ends of a secondary coil of the transformer.

Preferably, each circle of the routing of each layer of the PCB board is circular or square.

In this scheme, it is the E style of calligraphy with lower magnetic core to go up the magnetic core, the magnetic core all is including the boss that is located both ends and locate the stand at two boss centers with lower magnetic core on the E style of calligraphy, the transversal circular form of personally submitting of stand.

Furthermore, all set up on every layer of PCB board with boss matched with through-hole, go up the boss of magnetic core and lower magnetic core and arrange in the through-hole on PCB, the boss of going up the magnetic core is inconsistent with the boss of lower magnetic core.

In order to assemble the transformer into a module structure conveniently, the transformer further comprises a shell covering the outer sides of the PCB and the magnetic core, and each layer of PCB is provided with a lead-out pin exposed out of the shell.

The shell, the PCB and the surface of the magnetic core are sealed through glue pouring.

Preferably, the magnetic core is model TDK PC 44.

Compared with the prior art, the utility model has the advantages of: in the DC-DC isolated power supply module, the traditional copper wire winding is replaced by a multi-turn wiring mode through wiring on a multilayer PCB, so that the volume is reduced; in addition, the isolation voltage value is adjusted through the PCB spacing and the wiring spacing, so that isolation between power supplies can be realized, and the power supply module is simple in structure, small in size and good in isolation effect.

Drawings

Fig. 1 is a schematic structural diagram of a transformer in an embodiment of the present invention;

FIG. 2 is an exploded view of FIG. 1;

fig. 3 is a schematic structural diagram of a PCB board in an embodiment of the present invention;

fig. 4 is a cross-sectional view of a transformer in an embodiment of the present invention;

fig. 5 is a specific circuit diagram of the DC-DC isolated power module of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

The utility model provides a DC-DC keeps apart power module includes direct current input end, direct current output end and locate the transformer between direct current input end and direct current output end, the transformer includes PCB board and magnetic core, the magnetic core includes magnetic core and lower magnetic core, 4 layers of PCB boards that the PCB board was placed about at least, all be equipped with many circles on every layer of PCB board and walk the line, wherein, many circles are walked the line and are had electric conductivity, can replace current copper line, walk line both ends on every layer of PCB board and all be equipped with the link, walk line on the top layer PCB board and walk the line on the at least one layer of PCB board in middle part and loop through the link and establish ties and constitute the primary coil of transformer, walk line on bottom PCB board and the at least one layer of PCB board in middle part and loop through the link and establish ties and constitute the secondary coil of transformer, go

In order to make the volume of the transformer smaller, the middle PCB boards in the primary coil of the transformer are arranged at intervals, and the PCB board in the middle part, which is closest to the top PCB board, is also arranged at intervals with the top PCB board; similarly, the middle PCBs in the secondary coil of the transformer are arranged at intervals, and the PCB closest to the bottom PCB in the middle is also arranged at intervals with the bottom PCB.

Each circle of routing of each layer of PCB board is circular or square. In this embodiment, walk the line for circular, walk the line through the mode of drawing the circle on the PCB board, replace traditional outside copper line, reduced the volume of transformer.

In this embodiment, as shown in fig. 1 to 4, the transformer includes 4 layers of PCBs disposed in sequence from top to bottom, the first layer of PCB 31, the second layer of PCB 32, the third layer of PCB 33, and the fourth layer of PCB 34 are disposed in sequence from top to bottom, a connection end of the trace 4 on the first layer of PCB 31 and the third layer of PCB 33 is connected to each other, another connection end of the trace 4 on the first layer of PCB 31 and the third layer of PCB 31 is respectively corresponding to two ends of the primary coil of the transformer, a connection end of the trace 4 on the second layer of PCB 32 and the fourth layer of PCB 34 is connected to each other, and another connection end of the trace 4 on the second layer of PCB 32 and the fourth layer of PCB 34 is respectively corresponding to two ends of the secondary coil of the transformer.

In addition, in this embodiment, the upper magnetic core 1 and the lower magnetic core 2 are both in an E shape, the E-shaped upper magnetic core 1 and the E-shaped lower magnetic core 2 both include bosses located at both ends and a column disposed at the centers of the two bosses, and the cross section of the column is circular, wherein the upper magnetic core 1 includes the boss 11 and the column 12, and the lower magnetic core 2 includes the boss 21 and the column 22; all seted up on every layer of PCB board with boss matched with through-hole 5, go up magnetic core 1 and the boss of lower magnetic core 2 and arrange in through-hole 5 on the PCB board, go up the boss 11 of magnetic core 1 and the boss 21 counterbalance of lower magnetic core 2. The core was model TDK PC 44. Of course, other shapes of magnetic cores can be adopted, and the shape and size of the through hole on each layer of the PCB are determined by the magnetic cores.

In order to assemble the transformer into a module structure, the transformer further comprises a shell covering the outer sides of the PCB and the magnetic core, and each layer of PCB is provided with a lead-out pin exposed out of the shell. In addition, the shell, the PCB and the surface of the magnetic core are sealed through glue pouring.

As shown in fig. 5, the circuit diagram adopts a flyback isolated output mode, and outputs are regulated under different operating modes and loads. In this embodiment, the model of the power chip U1 is JW3510, the input voltage is connected to the 5 th pin VIN of the power chip U1 to provide voltage and current for the power chip U1, the 1 st pin EN of the power chip U1 is an enable/under-voltage control pin, and the 3 rd pin FRB of the power chip U1 is an input pin of an external feedback resistor.

The primary coil composed of pins 1 and 4 and the secondary coil composed of

pins

2 and 3 on the transformer T1 realize energy transmission and isolation by using a wiring (circular ring) on a PCB, wherein a magnetic field can be generated by winding a plurality of coils on magnetic cores corresponding to pins 1 and 4 on the primary side of the transformer TI, then a plurality of coils are wound on magnetic cores corresponding to

pins

2 and 3 on the secondary side of the transformer TI, and the purpose of input and output isolation and voltage output is achieved by converting the magnetic field into electricity.

The power module can adjust the wire diameter and the number of turns on the PCB according to different voltages and currents, the number of turns of the primary coil and the secondary coil of the transformer is easy to change, and the isolation voltage is easy to realize.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a DC-DC keeps apart power module, includes direct current input end, direct current output and locates the transformer between direct current input end and the direct current output, the transformer includes PCB board and magnetic core, the magnetic core includes magnetic core and lower magnetic core, its characterized in that: the PCB board is 4 layers of PCBs of placing from top to bottom at least, all be equipped with the multiturn on every layer of PCB board and walk the line, walk on every layer of PCB board line both ends and all be equipped with the link, walk on the top layer PCB board walk the line and loop through the primary coil that the link is established ties and is constituteed the transformer with walking on the at least one deck PCB board in middle part, walk on the at least one deck PCB board in bottom PCB board and the middle part and loop through the link and establish ties and constitute the secondary coil of transformer, go up the magnetic core and contact with the walking of top layer PCB board and bottom PCB board respectively with the magnetic.

2. The DC-DC isolated power supply module of claim 1, wherein: the middle PCB in the primary coil of the transformer is arranged at intervals, and the PCB closest to the top PCB in the middle is also arranged at intervals with the top PCB.

3. The DC-DC isolated power supply module of claim 1, wherein: the middle PCB in the secondary coil of the transformer is arranged at intervals, and the PCB in the middle part, which is closest to the bottom PCB, is also arranged at intervals with the bottom PCB.

4. The DC-DC isolated power supply module of claim 1, wherein: the transformer comprises 4 layers of PCBs (printed circuit boards) which are sequentially arranged from top to bottom, one connecting end of each line on the first PCB and the third PCB is connected, the other connecting end of each line on the first PCB and the third PCB corresponds to two ends of a primary coil of the transformer respectively, one connecting end of each line on the second PCB and the fourth PCB is connected, and the other connecting end of each line on the second PCB and the fourth PCB corresponds to two ends of a secondary coil of the transformer respectively.

5. The DC-DC isolated power supply module of claim 1, wherein: and each circle of routing of each layer of PCB board is circular or square.

6. The DC-DC isolated power supply module of claim 1, wherein: go up the magnetic core and be the E style of calligraphy with lower magnetic core, the magnetic core all is including the boss that is located both ends and locate the stand at two boss centers with lower magnetic core on the E style of calligraphy, the cross section of stand is personally submitted circularly.

7. The DC-DC isolated power supply module of claim 6, wherein: all seted up on every layer of PCB board with boss matched with through-hole, go up the boss of magnetic core and lower magnetic core and arrange in the through-hole on PCB, the boss of going up the magnetic core is inconsistent with the boss of lower magnetic core.

8. The DC-DC isolated power supply module of claim 1, wherein: the transformer further comprises a shell coated on the outer sides of the PCB and the magnetic core, and each layer of PCB is provided with a lead-out pin exposed out of the shell.

9. The DC-DC isolated power supply module of claim 8, wherein: the shell, the PCB and the surface of the magnetic core are sealed through glue pouring.

10. The DC-DC isolated power supply module according to any one of claims 1 to 9, wherein: the magnetic core is TDK PC44 model.