CN210579331U

CN210579331U - PCBA structure of LED power

Info

Publication number: CN210579331U
Application number: CN201921646032.3U
Authority: CN
Inventors: 李学军; 雷云波; 李志科
Original assignee: Shenzhen Watt Zhihui Technology Co Ltd
Current assignee: Watt Zhihui (Guangdong) Electronics Co.,Ltd.
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2020-05-19
Anticipated expiration: 2029-09-29

Abstract

The utility model discloses a PCBA structure of LED power, including lightning protection circuit, EMI filter circuit, PFC converting circuit, resonance half-bridge LCC circuit and half-bridge rectification and filter circuit, wherein, lightning protection circuit passes through EMI filter circuit with PFC converting circuit connects, PFC converting circuit passes through resonance half-bridge LCC circuit with half-bridge rectification and filter circuit connect. Has the advantages that: the LCC topology with high efficiency and good dimming performance is adopted, and the optimal design of EMI performance, thermal design and size is achieved through reasonable PCB layout, so that the high reliability and miniaturization of the PCBA of the LED power supply are realized.

Description

PCBA structure of LED power

Technical Field

The utility model relates to a LED drive power supply technical field particularly, relates to a PCBA structure of LED power.

Background

With the continuous progress of LED technology, LED lighting products have entered into daily lives of people on a large scale. Consumers have increasingly strict requirements on performance and price, the miniaturization of lamps becomes a development trend, and the LED power supply correspondingly faces the miniaturization design.

At present, the traditional LED power supply is not limited greatly on the installation space either because of external arrangement or because of large size of the lamp; and along with lamps and lanterns waterproof IP grade requirement improves, in addition the lamp pearl light efficiency constantly promotes makes aluminium base plate size reduce, and the LED power usually needs to be built-in to installation space is also restricted. Therefore, LED power supplies are required to be highly reliable and compact.

The traditional LED power supply adopts a single-stage PFC or other topologies, so that the efficiency is not high, and the power supply generates heat seriously; in addition, the size design is larger, which results in higher cost of the structural member.

An effective solution to the problems in the related art has not been proposed yet.

SUMMERY OF THE UTILITY MODEL

To the problem in the correlation technique, the utility model provides a PCBA structure of LED power to overcome the above-mentioned technical problem that current correlation technique exists.

Therefore, the utility model discloses a specific technical scheme as follows:

the PCBA structure of the LED power supply comprises a lightning protection circuit, an EMI filter circuit, a PFC conversion circuit, a resonance half-bridge LCC circuit and a half-bridge rectification and filter circuit, wherein the lightning protection circuit is connected with the PFC conversion circuit through the EMI filter circuit, and the PFC conversion circuit is connected with the half-bridge rectification and filter circuit through the resonance half-bridge LCC circuit.

Further, the lightning protection circuit comprises a piezoresistor RV1, a piezoresistor RV2, a piezoresistor RV3, a discharge tube GDT1, a discharge tube GDT2 and a FUSE FUSE, wherein one end of the FUSE FUSE is connected with a live wire Line, the other end of the FUSE FUSE is sequentially connected with one end of the piezoresistor RV2 and one end of the piezoresistor RV1, the other end of the piezoresistor RV2 is connected with one end of the piezoresistor RV3 through the discharge tube GDT1, the other end of the piezoresistor RV1 is sequentially connected with the other end of the piezoresistor RV3 and a Neutral through the discharge tube GDT2, and the third end of the GDT1 is grounded.

Further, the EMI filter circuit includes electric capacity CY1, electric capacity CY2, electric capacity CX1, electric capacity CX2 and common mode inductance LF2, wherein, electric capacity CY1 one end in proper order with electric capacity CX 1's one end, common mode inductance LF 2's first end and piezo-resistor RV 1's one end is connected, electric capacity CY 1's the other end with electric capacity CY 2's one end is connected and ground connection, electric capacity CY 2's the other end in proper order with electric capacity CX 1's the other end and common mode inductance LF 2's second end is connected, common mode inductance LF 2's third end with electric capacity CX 2's one end is connected, common mode inductance LF 2's fourth end with electric capacity CX 2's the other end is connected.

Further, the PFC conversion circuit comprises an inductor L1, a diode DA1, a diode DA2, a diode DA3, a diode DA4, a diode DA5, a diode DA6, a capacitor VC and a MOS transistor S, wherein the anode of the diode DA1 is sequentially connected with the cathode of the diode DA2 and the third end of the common-mode inductor LF2, the anode of the diode DA2 is sequentially connected with the anode of the diode DA4, the source of the MOS tube S and one end of the capacitor VC, the cathode of the diode DA4 is sequentially connected with the anode of the diode DA3 and the fourth end of the common-mode inductor LF2, the cathode of the diode DA3 is sequentially connected with the cathode of the diode DA1, the anode of the diode DA5 and one end of the inductor L1, the other end of the inductor L1 is connected with the drain electrode of the MOS transistor S and the anode of the diode DA6 in turn, and the cathode of the diode DA5 is sequentially connected with the cathode of the diode DA6 and the other end of the capacitor VC.

Further, the resonant half-bridge LCC circuit includes a MOS transistor S1, a MOS transistor S2, a diode DB1, a diode DB2, a capacitor C1, a capacitor C2, a capacitor CP, a resonant capacitor C20, a resonant inductor L2, and a transformer T1, wherein a drain of the MOS transistor S1 is sequentially connected to a cathode of the diode DA6, a cathode of the diode DB1, and one end of the capacitor C1, a source of the MOS transistor S1 is sequentially connected to an anode of the diode DB1, the other end of the capacitor C1, one end of the resonant inductor L2, a drain of the MOS transistor S2, a cathode of the diode DB2, and one end of the capacitor C2, a source of the MOS transistor S2 is sequentially connected to an anode of the diode DA6, an anode of the diode DB2, the other end of the capacitor C2, and one end of the resonant capacitor C20, and the other end of the resonant capacitor C20 is sequentially connected to an input end of the transformer CP 1 and the first input end of the capacitor T1, a second input end of the transformer T1 is sequentially connected to the other end of the capacitor CP and the other end of the resonant inductor L2.

Further, the half-bridge rectification and filtering circuit includes a diode D1, a diode D2, a diode D3, a diode D4, an inductor Lf, a capacitor Cf, and a resistor RL, wherein an anode of the diode D1 is sequentially connected to the first output end of the transformer T1 and a cathode of the diode D2, an anode of the diode D2 is sequentially connected to an anode of the diode D4, one end of the capacitor Cf, and one end of the resistor RL, a cathode of the diode D4 is sequentially connected to the second output end of the transformer T1 and an anode of the diode D3, a cathode of the diode D3 is sequentially connected to a cathode of the diode D1 and one end of the inductor Lf, and the other end of the inductor Lf is sequentially connected to the other end of the capacitor Cf and the other end of the resistor RL.

The utility model has the advantages that:

(1) the LCC topology with high efficiency and good dimming performance is adopted, and the optimal design of EMI performance, thermal design and size is achieved through reasonable PCB layout, so that the high reliability and miniaturization of the PCBA of the LED power supply are realized.

(2) By optimizing the circuit design, the efficiency of a power supply is improved by adopting LCC topology and device model selection, so that the reliability of a product is improved; through reasonable PCB layout, optimize the product size for PCBA miniaturization reliability is taken into account.

(3) And compare current PCBA, the utility model discloses technical scheme's PCBA design can improve the performance, reduces the volume.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of a PCBA structure of an LED power supply according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram (150WPCBA) of a PCBA structure of an LED power supply according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a lightning protection circuit of a PCBA structure of an LED power supply according to an embodiment of the present invention;

fig. 4 is a schematic diagram of an EMI filter circuit of a PCBA structure of an LED power supply according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a PFC converter circuit of a PCBA structure of an LED power supply according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a resonant half-bridge LCC circuit of a PCBA configuration of an LED power supply according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a half-bridge rectification filter circuit of a PCBA structure of an LED power supply according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a 75W PCBA in accordance with an embodiment of the present invention;

fig. 9 is a schematic diagram of a 105W PCBA in accordance with an embodiment of the present invention;

FIG. 10 is a schematic diagram of a 200W (LV) PCBA in accordance with an embodiment of the present invention;

FIG. 11 is a schematic diagram of a 200W (HV) PCBA in accordance with an embodiment of the present invention;

fig. 12 is a schematic diagram of a 240W (LV) PCBA in accordance with an embodiment of the invention;

fig. 13 is a schematic diagram of a 240W (HV) PCBA in accordance with an embodiment of the invention;

fig. 14 is a schematic diagram of a 320W (LV) PCBA in accordance with an embodiment of the invention;

fig. 15 is a schematic diagram of a 320W (HV) PCBA in accordance with an embodiment of the invention;

fig. 16 is a schematic diagram of a 100W (E) PCBA in accordance with an embodiment of the present invention;

fig. 17 is a schematic diagram of a 150W (E) PCBA in accordance with an embodiment of the present invention.

In the figure:

1. a lightning protection circuit; 2. an EMI filter circuit; 3. a PFC conversion circuit; 4. a resonant half-bridge LCC circuit; 5. half-bridge rectification and filter circuit.

Detailed Description

For further explanation of the embodiments, the drawings are provided as part of the disclosure and serve primarily to illustrate the embodiments and, together with the description, to explain the principles of operation of the embodiments, and to provide further explanation of the invention and advantages thereof, it will be understood by those skilled in the art that various other embodiments and advantages of the invention are possible, and that elements in the drawings are not to scale and that like reference numerals are generally used to designate like elements.

According to the utility model discloses an embodiment provides a PCBA structure of LED power.

Now combine the attached drawings and detailed description to the utility model discloses it is further explained, as shown in fig. 1-7, according to the utility model discloses a PCBA structure of LED power, including lightning protection circuit 1, EMI filter circuit 2, PFC converting circuit 3, resonance half-bridge LCC circuit 4 and half-bridge rectification and filter circuit 5, wherein, lightning protection circuit 1 passes through EMI filter circuit 2 with PFC converting circuit 3 is connected, PFC converting circuit 3 passes through resonance half-bridge LCC circuit 4 with half-bridge rectification and filter circuit 5 are connected.

In one embodiment, the lightning protection circuit 1 includes a voltage dependent resistor RV1, a voltage dependent resistor RV2, a voltage dependent resistor RV3, a discharge tube GDT1, a discharge tube GDT2, and a FUSE, wherein one end of the FUSE is connected to a live Line, the other end of the FUSE is connected to one end of the voltage dependent resistor RV2 and one end of the voltage dependent resistor RV1 in sequence, the other end of the voltage dependent resistor RV2 is connected to one end of the voltage dependent resistor RV3 through the discharge tube GDT1, the other end of the voltage dependent resistor RV1 is connected to the other end of the voltage dependent resistor RV3 and a Neutral through the discharge tube GDT2 in sequence, and a third end of the discharge tube GDT1 is grounded.

In an embodiment, the EMI filter circuit 2 includes a capacitor CY1, a capacitor CY2, a capacitor CX1, a capacitor CX2, and a common mode inductor LF2, wherein one end of the capacitor CY1 is connected to one end of the capacitor CX1, the first end of the common mode inductor LF2, and one end of the voltage dependent resistor RV1 in sequence, the other end of the capacitor CY1 is connected to one end of the capacitor CY2 and grounded, the other end of the capacitor CY2 is connected to the other end of the capacitor CX1 and the second end of the common mode inductor LF2 in sequence, the third end of the common mode inductor LF2 is connected to one end of the capacitor CX2, and the fourth end of the common mode inductor LF2 is connected to the other end of the capacitor CX 2.

In one embodiment, the PFC converter circuit 3 includes an inductor L1, a diode DA1, a diode DA2, a diode DA3, a diode DA4, a diode DA5, a diode DA6, a capacitor VC, and a MOS transistor S, wherein an anode of the diode DA1 is sequentially connected to a cathode of the diode DA2 and a third end of the common mode inductor LF2, an anode of the diode DA2 is sequentially connected to an anode of the diode DA4, a source of the MOS transistor S, and one end of the capacitor VC, a cathode of the diode DA4 is sequentially connected to an anode of the diode DA3 and a fourth end of the common mode inductor LF2, a cathode of the diode DA3 is sequentially connected to a cathode of the diode DA1, an anode of the diode DA5, and one end of the inductor L1, another end of the inductor L1 is sequentially connected to an anode of the drain of the MOS transistor S67 6 and a cathode of the diode DA5, and another end of the diode DA6 and the capacitor VC.

In one embodiment, the resonant half-bridge LCC circuit 4 includes a MOS transistor S1, a MOS transistor S2, a diode DB1, a diode DB2, a capacitor C1, a capacitor C2, a capacitor CP, a resonant capacitor C20, a resonant inductor L2, and a transformer T1, wherein a drain of the MOS transistor S1 is sequentially connected to a cathode of the diode DA6, a cathode of the diode DB1, and one end of the capacitor C1, a source of the MOS transistor S1 is sequentially connected to an anode of the diode DB1, the other end of the capacitor C1, one end of the resonant inductor L2, a drain of the MOS transistor S2, a cathode of the diode DB2, and one end of the capacitor C2, a source of the MOS transistor S2 is sequentially connected to an anode of the diode DA2, an anode of the diode DB2, the other end of the capacitor C2, and one end of the transformer CP 2, a second input end of the transformer T1 is sequentially connected to the other end of the capacitor CP and the other end of the resonant inductor L2.

In one embodiment, the half-bridge rectification and filtering circuit 5 includes a diode D1, a diode D2, a diode D3, a diode D4, an inductor Lf, a capacitor Cf, and a resistor RL, wherein an anode of the diode D1 is sequentially connected to the first output terminal of the transformer T1 and a cathode of the diode D2, an anode of the diode D2 is sequentially connected to an anode of the diode D4, one end of the capacitor Cf, and one end of the resistor RL, a cathode of the diode D4 is sequentially connected to the second output terminal of the transformer T1 and an anode of the diode D3, a cathode of the diode D3 is sequentially connected to a cathode of the diode D1 and one end of the inductor Lf, and a further end of the inductor Lf is sequentially connected to a further end of the capacitor Cf and a further end of the resistor RL.

The working principle is as follows: this PCBA structure of LED power is when specifically using, the utility model discloses a PCBA divide into five parts: the device comprises a lightning protection circuit 1, an EMI filter circuit 2, a PFC conversion circuit 3, a resonance half-bridge LCC circuit 4 and a half-bridge rectification and filter circuit 5; the lightning protection circuit 1 adopts a lightning protection device with smaller size and better performance, and reduces the space on the premise of ensuring the performance; the EMI filter circuit 2 adopts a single-stage design to replace the traditional two-stage or three-stage design; the PFC conversion circuit 3 and the resonant half-bridge LCC circuit 4 are designed in a customized mode through a skeleton magnetic core to save space, meanwhile, the layout of magnetic devices is reasonable, and the optimal thermal design is achieved by means of shell heat dissipation; the half-bridge rectification and filter circuit 5 meets the performance by adopting a mode of adding a chip to a nearby shell.

As shown in fig. 2, taking a 150W power PCBA as an example, as shown in fig. 3, the lightning protection circuit 1 is composed of a differential mode varistor, a common mode varistor and a discharge tube, wherein the common mode varistor is a varistor with a small size of Φ 10, and mainly functions to absorb surge voltage and protect the power supply from being damaged by lightning surge.

As shown in fig. 4, the EMI filter circuit 2 only uses a common mode inductor LF2 to replace the conventional two-stage or three-stage common mode filter circuit, and at the same time, the power supply meets the conduction and radiation safety standard.

As shown in fig. 5 and 6, the PFC converter circuit 3 and the resonant half-bridge LCC circuit 4 are power converter circuits, which can improve the performance index of the power supply; the PFC conversion circuit 3 is a power factor correction circuit, the L1 is a PFC inductor, PF value and THD value indexes of a power supply are improved, interference to a power grid is reduced, the resonant half-bridge LCC circuit 4 mainly comprises a resonant inductor L2, a transformer T1, a resonant capacitor C20 and a power MOS (metal oxide semiconductor) tube, the circuit has the characteristics of high efficiency, good dimming performance and the like, and the efficiency and reliability of the power supply are improved; the inductor L1, the resonance inductor L2 and the transformer T1 in the PFC conversion circuit 3 all adopt miniaturized frameworks, so that the occupied area of a magnetic device is saved, and meanwhile, the PFC conversion circuit is tightly attached to a shell for heat dissipation, so that the thermal design is met;

as shown in fig. 7, the half-bridge rectifying and filtering circuit 5 is also compact in design, and can save space while satisfying performance.

In practical application, as shown in fig. 8-17, according to the difference of the power, the magnetic device and the corresponding grade of the power device are increased, the size of the housing is also increased, the overall design and layout can be kept unchanged, so as to derive more series of products.

To sum up, with the help of the above technical scheme of the utility model, adopt efficient, the LCC topology that light modulation performance is good, through reasonable PCB overall arrangement to reach the optimal design of EMI performance, thermal design, size, thereby realize LED power PCBA's high reliability and miniaturization. By optimizing the circuit design, the efficiency of a power supply is improved by adopting LCC topology and device model selection, so that the reliability of a product is improved; through reasonable PCB layout, optimize the product size for PCBA miniaturization reliability is taken into account. Compare current PCBA, the utility model discloses technical scheme's PCBA design can improve the performance, reduces the volume.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The PCBA structure of the LED power supply is characterized by comprising an anti-lightning circuit (1), an EMI filter circuit (2), a PFC conversion circuit (3), a resonant half-bridge LCC circuit (4) and a half-bridge rectification and filter circuit (5), wherein the anti-lightning circuit (1) is connected with the PFC conversion circuit (3) through the EMI filter circuit (2), and the PFC conversion circuit (3) is connected with the half-bridge rectification and filter circuit (5) through the resonant half-bridge LCC circuit (4).

2. The PCBA structure of the LED power supply as recited in claim 1, wherein the lightning protection circuit (1) comprises a varistor RV1, a varistor RV2, a varistor RV3, a discharge tube GDT1, a discharge tube GDT2 and a FUSE FUSE, wherein one end of the FUSE FUSE is connected with a live Line, the other end of the FUSE FUSE is sequentially connected with one end of the varistor RV2 and one end of the varistor RV1, the other end of the varistor RV2 is connected with one end of the varistor RV3 through the discharge tube GDT1, the other end of the varistor RV1 is sequentially connected with the other end of the varistor RV3 and the Neutral Line Neutral through the discharge tube GDT2, and the third end of the discharge tube GDT1 is grounded.

3. The PCBA structure of the LED power supply of claim 2, wherein the EMI filter circuit (2) comprises a capacitor CY1, a capacitor CY2, a capacitor CX1, a capacitor CX2 and a common mode inductor LF2, wherein one end of the capacitor CY1 is connected with one end of the capacitor CX1, the first end of the common mode inductor LF2 and one end of the piezoresistor RV1 in sequence, the other end of the capacitor CY1 is connected with one end of the capacitor CY2 and grounded, the other end of the capacitor CY2 is connected with the other end of the capacitor CX1 and the second end of the common mode inductor LF2 in sequence, the third end of the common mode inductor LF2 is connected with one end of the capacitor CX2, and the fourth end of the common mode inductor LF2 is connected with the other end of the capacitor CX 2.

4. The PCBA structure of the LED power supply according to claim 3, wherein the PFC conversion circuit (3) comprises an inductor L1, a diode DA1, a diode DA2, a diode DA3, a diode DA4, a diode DA5, a diode DA6, a capacitor VC and a MOS transistor S, wherein the anode of the diode DA1 is sequentially connected with the cathode of the diode DA2 and the third end of the common mode inductor LF2, the anode of the diode DA2 is sequentially connected with the anode of the diode DA4, the source of the MOS transistor S and one end of the capacitor VC, the cathode of the diode DA4 is sequentially connected with the anode of the diode DA3 and the fourth end of the common mode inductor LF2, the cathode of the diode DA3 is sequentially connected with the cathode of the diode DA1, the anode of the diode DA5 and one end of the inductor L1, the drain of the inductor L1 is sequentially connected with the anode of the drain of the inductor DA6 and the anode of the diode DA6, and the cathode of the diode DA5 is sequentially connected with the cathode of the diode DA6 and the other end of the capacitor VC.

5. The PCBA structure of the LED power supply according to claim 4, wherein the resonant half-bridge LCC circuit (4) comprises a MOS tube S1, a MOS tube S2, a diode DB1, a diode DB2, a capacitor C1, a capacitor C2, a capacitor CP, a resonant capacitor C20, a resonant inductor L2 and a transformer T1, wherein a drain of the MOS tube S1 is connected with a cathode of the diode DA6, a cathode of the diode DB1 and one end of the capacitor C1 in turn, a source of the MOS tube S1 is connected with an anode of the diode DB1, the other end of the capacitor C1, one end of the resonant inductor L2, a drain of the MOS tube S2, a cathode of the diode DB2 and one end of the capacitor C2 in turn, a source of the MOS tube S2 is connected with an anode of the diode DA6, an anode of the diode DB2, the other end of the capacitor C2 and one end of the resonant capacitor C20 in turn, the other end of the resonant capacitor C20 is sequentially connected to one end of the capacitor CP and the first input end of the transformer T1, and the second input end of the transformer T1 is sequentially connected to the other end of the capacitor CP and the other end of the resonant inductor L2.

6. A PCBA structure for LED power supply according to claim 5, the half-bridge rectifying and filtering circuit (5) comprises a diode D1, a diode D2, a diode D3, a diode D4, an inductor Lf, a capacitor Cf and a resistor RL, wherein the anode of the diode D1 is connected to the first output terminal of the transformer T1 and the cathode of the diode D2 in turn, the anode of the diode D2 is connected with the anode of the diode D4, one end of the capacitor Cf and one end of the resistor RL in turn, the cathode of the diode D4 is sequentially connected to the second output terminal of the transformer T1 and the anode of the diode D3, the cathode of the diode D3 is connected with the cathode of the diode D1 and one end of the inductor Lf in turn, the other end of the inductor Lf is sequentially connected with the other end of the capacitor Cf and the other end of the resistor RL.