CN215935135U

CN215935135U - LED power supply

Info

Publication number: CN215935135U
Application number: CN202120323255.7U
Authority: CN
Inventors: 钱伟书; 王其明; 王林吉; 徐斌杰
Original assignee: Ningbo Self Electronics Co Ltd
Current assignee: Ningbo Self Electronics Co Ltd
Priority date: 2021-02-03
Filing date: 2021-02-03
Publication date: 2022-03-01
Anticipated expiration: 2031-02-03

Abstract

The utility model discloses an LED power supply, which comprises a circuit board assembly, wherein a high-voltage input end, a rectifying and filtering circuit, a driving control module, a step-down transformer, a DC-DC circuit and an LED connecting end which are electrically connected in sequence are arranged on the circuit board assembly; according to the LED power supply, the circuit board is modularized, the plugboard is in a form, electronic components are arranged in a three-dimensional mode, the size among the components is compact, the overall size of a product can be greatly reduced, and the requirement for miniaturization of the product is met.

Description

LED power supply

Technical Field

The utility model relates to the technical field of driving power supplies, in particular to an LED power supply.

Background

The LED power supply is a driving power supply, miniaturization is a development direction of the LED power supply, the miniaturization of the LED power supply has higher difficulty for electromagnetic compatibility design than that of a common power supply, particularly, the difficulty of a dimmable power supply is higher, and because the working state and the working frequency of the LED power supply are greatly different when the LED power supply is in full power, dimmable power and light load low power, the working frequency range of a common EMC inductor and capacitor is relatively fixed, and the electromagnetic compatibility (EMC) design is difficult.

In addition, for a compact LED power supply, in order to solve the heat dissipation problem of a power device, a potting adhesive is generally used, but the potting adhesive has a certain dielectric constant, so that the electromagnetic compatibility of the product is reduced. The conventional treatment method comprises the following steps: in order to pass through EMC test standards, filter inductance and filter capacitance are added or enlarged on input and output circuits of a circuit, meanwhile, the distance between a switching power device and an electromagnetic compatible device can be increased to inhibit high-frequency electromagnetism, or a metal shielding cover is adopted, so that the defects that the cost of a product can be greatly increased, the complexity of the production process is increased, the size of the product needs to be increased, the product is not easy to be made small, and the market demand cannot be met are overcome.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides an LED power supply to solve the above technical problems.

The utility model provides a LED power, includes circuit board assembly, be equipped with electric connection's high-voltage input end, rectification filter circuit, drive control module, step-down transformer, DC-DC circuit and LED link in proper order on the circuit board assembly, drive control module includes the control unit and switch unit at least, circuit board assembly include mainboard and at least one with mainboard electric connection and mutually perpendicular's first daughter board, be equipped with on the first daughter board drive control module.

Preferably, the circuit board assembly includes a second sub-board electrically connected to the main board and perpendicular to the main board, and the second sub-board is provided with a DC-DC line.

Preferably, the DC-DC line is electrically connected to a dimming control module, and the dimming control module and the DC-DC line are disposed on the second sub-board.

Preferably, the rectifying and filtering circuit is arranged on the main board, and the rectifying and filtering circuit comprises a plurality of EMC devices.

Preferably, a metal shielding band arranged around the switch unit is arranged on the first sub-board, and the metal shielding band is grounded.

Preferably, the metal shielding tape is single-sided.

Preferably, at least part of the metal shielding belt is double-sided, and a metalized through hole is arranged in a double-sided area for conduction.

Preferably, the metal shielding strip at least comprises a first section extending outwards from a position close to the main board, and the first section is located on one side close to the edge of the first sub-board and is at least flush with the upper edge of the switch unit.

Preferably, the switching unit adopts a MOS transistor.

Preferably, the metal shielding tape further includes a second segment connected to an end of the first segment and continuously disposed around the switching unit.

The utility model has the technical effects that:

according to the LED power supply, the circuit board is modularized, the plugboard is in a form, electronic components are arranged in a three-dimensional mode, the size among the components is compact, the overall size of a product can be greatly reduced, and the requirement for miniaturization of the product is met; the metal shielding belt is arranged on the periphery of the switch unit, so that the electromagnetic interference part generated by the switch unit is led into the ground wire through the metal shielding belt, the interference to other EMC devices is reduced, particularly, the product with glue pouring can achieve a certain shielding effect and meet the requirements of electromagnetic compatibility standards, the production process is simple, the capacitance values of other devices such as filter capacitors can be correspondingly reduced, the device with a small packaging size can be selected, the occupied space size of the components is reduced, and the product cost is saved.

Drawings

Embodiments of the utility model are described below with reference to the accompanying drawings, in which:

fig. 1 is a structural wire frame diagram of the LED power supply of the present embodiment.

Fig. 2 is a structural wire frame diagram of the drive control module of the present embodiment.

Fig. 3 is a circuit diagram of the LED power supply of the present embodiment.

Fig. 4 is a schematic structural diagram of the circuit board assembly of the present embodiment.

Fig. 5 is a schematic perspective view of the circuit board assembly of this embodiment.

Fig. 6 is a schematic structural diagram of the first sub-board of the present embodiment.

Fig. 7 is a schematic structural view of the back surface of the first sub-board of the present embodiment.

Fig. 8 is a schematic structural diagram of a first sub-board according to another embodiment.

Fig. 9 is a schematic structural diagram of a first sub-board according to another embodiment.

Fig. 10 is a schematic structural diagram of a first sub-board according to another embodiment.

Fig. 11 is a schematic structural view of a back surface of a first sub-board according to another embodiment.

Detailed Description

Specific embodiments of the present invention will be described in further detail below based on the drawings. It should be understood that the description herein of embodiments of the utility model is not intended to limit the scope of the utility model.

As shown in fig. 1 to 7, the LED power supply of the present embodiment includes a circuit board assembly 100, and the circuit board assembly 100 is provided with a high voltage input end 200, a rectifying and filtering circuit 300, a driving control module 400, a step-down transformer 500, a DC-DC circuit 600, and an LED connecting end 700, which are electrically connected in sequence. The power supply adopts the printed circuit board to realize the electrical connection of the modules and the electronic components of the circuit, and how to arrange the modules and the circuit on the circuit board is the prior art and is not described in detail.

In the prior art, the LED power supply includes the high voltage input terminal 200, the rectifying and filtering circuit 300, the driving control module 400, the step-down transformer 500, the DC-DC circuit 600, and the LED connection terminal 700, and the specific circuit and the connection manner of the circuits are the prior art, and the existing circuits may be used, which is not described herein.

The LED power supply further includes a housing for the circuit board assembly 100, which is known in the art and will not be described in detail.

Drive control module 400 includes control unit 401 and switch unit 402 at least, circuit board assembly 100 include mainboard 101 and at least one with mainboard 101 electrical connection and mutually perpendicular's first daughter board 102, be equipped with on the first daughter board 102 drive control module 400 realizes electrical connection through the mode of picture peg, is convenient for realize automated production, and mutually perpendicular arranges and realizes three-dimensional arranging.

The circuit board assembly 100 includes a second sub-board 103 electrically connected to the main board 101 and perpendicular to each other, and a DC-DC line 600 is disposed on the second sub-board 103.

The DC-DC line 600 is electrically connected with a dimming control module 800, and the dimming control module 800 and the DC-DC line 600 are disposed on the second sub-board 103.

The first sub-board 102 and the second sub-board 103 can adopt a double-sided SMT process, the production process is simple, and the miniaturization requirement is met on the premise of realizing the product function.

The switch unit 401 operating frequency of LED power is higher, can produce the electromagnetic wave interference of switching oscillation and many times high frequency harmonic etc. can produce adverse effect to electric apparatus and environment on every side, and electronic product need satisfy the test standard to the aspect of electromagnetic compatibility in domestic and international, just can get into application market, consequently, need carry out the compliance design to the electromagnetic compatibility of product, and the design is exclusively used in electromagnetic compatibility's filter and circuit, in order to eliminate above-mentioned problem, rectification filter circuit 300 sets up on mainboard 101, rectification filter circuit 300 includes a plurality of EMC devices.

The core of the switching power supply is a switching unit 401, i.e. a power switching device, the switching unit 401 generates a large amount of high-frequency electromagnetic interference during the switching operation, the generated high-frequency electromagnetic interference must be suppressed by the EMC devices such as C101, C102, L101, L102 (not shown in the figure) on the rectifying-filtering circuit 300, the specific types and number of the EMC devices can be selected according to the need, which is only exemplary in this embodiment, by the above arrangement to reduce the electromagnetic interference, however, when the product size is small, the switch unit 401 is close to the EMC device, which directly affects the effect of the EMC circuit, especially, when the LED power supply is provided with the dimming circuit, the switching frequency variation range is large, the electromagnetic compatible circuit is difficult to meet the standard requirement, and especially the average value limit curve of the middle frequency band of 200K-1000 KHz in the conduction test has great influence and is difficult to pass.

In the prior art, a metal shielding cover is available, for example, a grounded metal shielding cover can be used for the first sub-board 102 where the switch unit 401 is located, so as to reduce electromagnetic interference, but the process is complicated, mass production is not facilitated, and the overall cost is also increased greatly.

The present embodiment is directed to an improved electromagnetic compatibility design of the switch unit 401, wherein a grounding metal shielding tape 1021 is added at a position close to the EMC device, the metal shielding tape 1021 arranged around the switch unit 402 is arranged on the first daughter board 102, and the metal shielding tape 1021 is grounded.

The metal shielding belt 1021 can be a single surface, and can be arranged on two surfaces in order to improve the effect, namely, a copper foil and a metalized through hole can be directly adopted on a double-surface circuit board, the electromagnetic interference part generated by the switch unit 402 is led into the ground wire through the metal shielding belt 1021, the interference to other EMC devices is reduced, particularly, the product with glue filling can achieve a certain shielding effect, the electromagnetic compatibility standard requirement is met, the production process is simple, the capacity value of other devices such as a filter capacitor and the like can be correspondingly reduced, the device with a small packaging size can be selected, the occupied space size of the components is reduced, and the product cost is saved. In the present embodiment, the first and second electrodes are,

the metal shielding tape 1021 of the embodiment includes a first section 1023 extending outward from a position close to the main board 101, and the first section 1023 is located at a side close to the edge of the first sub-board 102 and passes over the upper edge 4021 of the switch unit 402. The first section 1023 of the metal shielding strip 1021 is double-sided, and a metalized through hole 1022 is arranged in the area of the double-sided arrangement and is communicated with the area. The metallic shielding tape 1021 of this embodiment further includes a second section 1024 connected to the end of the first section 1023 and continuously disposed around the switch unit 402, where the second section 1024 is disposed on a single side, and generally, two sides are disposed as long as there is enough area on the back side, because the shielding effect of the two sides is better, but the second section 1024 can be selected as required because the circuit arrangement position is not enough.

In another embodiment, as shown in fig. 8, the first section 1023 is provided only and is single-sided.

In another embodiment, as shown in fig. 9, the first section 1023 and the second section 1024 are provided and are single sided.

As shown in fig. 10 and 11, in another embodiment, there are provided the first section 1023 and the second section 1024, the first section 1023 is double-sided, the front section of the second section 1024 is also double-sided, the rear section is single-sided, and the rear section of the second section 1024 is grounded.

The switch unit 402 is a power switch device, and in this embodiment, an MOS transistor is used, or a triode may be used.

With the arrangement, the distance between the EMC device of the rectifying and filtering circuit 300 closest to the first sub-board 102 and the first sub-board 102 can be less than 5mm, so that the circuit board assembly 100 is compact.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, and any modifications, equivalents or improvements that are within the spirit of the present invention are intended to be covered by the following claims.

Claims

1. The utility model provides a LED power supply, includes circuit board assembly (100), be equipped with electric connection's high voltage input end (200), rectification filter circuit (300), drive control module (400), step-down transformer (500), DC-DC circuit (600) and LED link (700) in proper order on circuit board assembly (100), drive control module (400) include control unit (401) and switch unit (402) at least, its characterized in that, circuit board assembly (100) include mainboard (101) and at least one with mainboard (101) electric connection and mutually perpendicular's first daughter board (102), be equipped with on first daughter board (102) drive control module (400).

2. LED power supply according to claim 1, characterized in that the circuit board assembly (100) comprises a second sub-board (103) electrically connected to the main board (101) and perpendicular to each other, on which second sub-board (103) a DC-DC line (600) is provided.

3. The LED power supply of claim 2, wherein a dimming control module (800) is electrically connected to the DC-DC line (600), the dimming control module (800) and the DC-DC line (600) being disposed on the second daughter board (103).

4. LED power supply according to claim 1, characterized in that said rectifying-filtering circuit (300) is provided on a main board (101), said rectifying-filtering circuit (300) comprising a plurality of EMC devices.

5. The LED power supply according to claim 4, wherein the first sub-board (102) is provided with a metal shielding tape (1021) arranged around the switch unit (402), the metal shielding tape (1021) being grounded.

6. The LED power supply of claim 5, wherein the metal shielding tape (1021) is single-sided.

7. The LED power supply of claim 5, wherein the metal shielding tape (1021) is at least partially double-sided, and a region of the double-sided arrangement is provided with a metalized via (1022) for conduction.

8. The LED power supply of claim 5, wherein the metal shielding tape (1021) comprises at least a first section (1023) extending outward from a location near the main board (101), the first section (1023) being located on a side near an edge of the first sub-board (102) and being flush with at least an upper edge (4021) of the switch unit (402).

9. The LED power supply according to any claim 1-8, wherein the switching unit (402) is a MOS transistor.

10. The LED power supply of claim 8, wherein the metal shielding tape (1021) further comprises a second segment (1024) connecting the ends of the first segment (1023) disposed continuously around the switch unit (402).