WO2021031251A1

WO2021031251A1 - Low-dropout lamp strip circuit board and single-ended power supply lamp strip using same

Info

Publication number: WO2021031251A1
Application number: PCT/CN2019/104919
Authority: WO
Inventors: 蒋振; 黄诒毅
Original assignee: 中山市弘木照明科技有限公司
Priority date: 2019-08-19
Filing date: 2019-09-09
Publication date: 2021-02-25
Also published as: CN210670778U

Abstract

Provided is a low-dropout lamp strip circuit board, comprising: a circuit board body (10); a power source line (20) arranged on the circuit board body (10) in the lengthwise direction of the circuit board body (10), wherein the head end or the tail end of the power source line (20) can be electrically connected to an external driving power source, and the power source line (20) can be connected to an external LED lamp set (50); and a power supplementing line (30) arranged on the circuit board body (10) in the lengthwise direction of the circuit board body (10), the head end of the power supplementing line (30) being connected to the head end of the power source line (20), and the tail end of the power supplementing line (30) being connected to the tail end of the power source line (20). The power supplementing line (30) can shunt part of a current at the head end of the power source line (20) to the tail end of the power source line (20), so that a dropout voltage generated by a head end portion of the power source line (20) due to its own resistance is reduced, and the voltage difference between the head end and the tail end of the power source line (20) is reduced, thereby facilitating avoiding the problem of the brightness of the LED lamp set (50) at a tail end portion of the circuit board body (10) being reduced; and there is no need to provide two driving power sources, the costs are relatively low, and the use is convenient.

Description

Low-voltage drop lamp strip circuit board and single-ended power supply lamp strip using the same

Technical field

The invention relates to the field of lighting, in particular to a light strip circuit board.

Background technique

With the development of the lighting field, LED light strips are widely used in decoration, advertising and other fields because of their high brightness, energy saving, and long service life.

Generally, the light strip includes a circuit board and an LED lamp group. The circuit board is provided with a power circuit electrically connected to the LED lamp group. An external driving power source is electrically connected to the power circuit to drive the LED lamp group to emit light. In situations such as the outer edge of a decorative building, a longer length of light strip is required. When it is energized, the resistance of the power line will produce a voltage drop. As the length of the power line increases, the voltage drop gradually accumulates, making the power line tail If the voltage at the end is too low, the current at the end of the light strip is too small, and the brightness of the LED lamp group will be attenuated, which will affect the lighting effect.

In the prior art, a double-ended power supply method is generally used, and a driving power supply is used for power supply at the head end and the tail end of the circuit board respectively, to prevent the brightness of the tail end of the light strip from decreasing. However, this method requires the use of two driving power supplies, which is costly, and the output voltage requirements of the two driving power supplies are the same, which is inconvenient to use.

Summary of the invention

In order to solve the above-mentioned problems, the present invention provides a low-pressure drop light strip circuit board and a single-ended power supply light strip using the same, which can reduce the voltage drop caused by the length of the light strip tail end, and is beneficial to prevent the brightness of the light strip tail end from decreasing.

A technical solution provided by the present invention to solve its technical problem is:

Low-dropout lamp with circuit board, including:

Circuit board body;

A power line is arranged on the circuit board body along the length of the circuit board body, the head end or the tail end of the power line can be electrically connected to an external driving power source, and the power line can be connected to an external LED lamp group connection;

The power supply circuit is arranged on the circuit board body along the length direction of the circuit board body, the head end of the power supply circuit is connected to the head end of the power supply circuit, and the tail end of the power supply circuit is connected to the power supply circuit. The end of the power line is connected.

Preferably, the power supply line includes a positive power supply line and a negative power supply line, and the power supply line includes a positive power supply line and a negative power supply line. The head and tail of the positive power supply line are respectively connected to the head of the positive power supply line. The end and the tail end are correspondingly connected, and the head end and the tail end of the negative electrode patch cord are respectively connected to the head end and the tail end of the negative power cord.

Preferably, the power supply circuit and the power supply circuit are located on the same printed surface of the circuit board body.

Preferably, the power supply circuit and the power supply circuit are located on different printed surfaces of the circuit board body.

Preferably, the power supply line is connected to the power supply line by welding.

Preferably, it further includes a connector, the connector is provided with an insertion groove that allows the end of the circuit board body to extend, and a conductive element is provided in the insertion groove, and the conductive element can be connected to the The power supply line and the power supply line are electrically connected.

Preferably, the connecting member is provided with a power interface electrically connected to the conductive member, and the power interface can be electrically connected to an external driving power source.

Preferably, the circuit board body is a flexible circuit board.

Another technical solution provided by the present invention is:

Single-ended power supply light strip: including the above-mentioned low-voltage drop light strip circuit board, and further comprising an LED lamp group arranged on the circuit board body, and the LED lamp group is electrically connected with the power supply line.

The beneficial effect of the present invention is that the head end and the tail end of the power supply line are respectively connected to the head end and the tail end of the power supply line, and the middle part of the power supply line is not electrically connected to the middle part of the power supply line. The electrical circuit can shunt part of the current at the head end of the power line to the tail end of the power line, so that the voltage drop at the head end of the power line due to its own resistance is reduced, and the voltage difference between the head end and the tail end of the power line is reduced, which is beneficial to avoid the circuit board body The problem of the brightness reduction of the LED lamp group at the tail end does not require two driving power sources, and the cost is low and easy to use.

Description of the drawings

The present invention will be further described below in conjunction with the drawings and embodiments:

Fig. 1 is a schematic diagram of one embodiment of the low-pressure drop light strip circuit board;

Fig. 2 is a front view of another embodiment of a low-pressure drop light strip circuit board;

Fig. 3 is a rear view of another embodiment of the low-pressure drop light strip circuit board;

Figure 4 is a schematic diagram of the connector;

Figure 5 is a circuit diagram of a single-ended power supply light strip.

detailed description

This section will describe the specific embodiments of the present invention in detail. The preferred embodiments of the present invention are shown in the drawings. The function of the drawings is to supplement the description of the text part of the manual with graphics, so that people can intuitively and vividly understand the text. Each technical feature and overall technical solution of the invention cannot be understood as a limitation on the protection scope of the present invention.

1 to 3, the low-dropout lamp strip circuit board provided by the present invention includes:

Circuit board body 10;

The power line 20 is arranged on the circuit board body 10 along the length direction of the circuit board body 10, the head end or the tail end of the power line 20 can be electrically connected to an external driving power source, and the power line 20 can Connect with the external LED light group 50;

The power supply line 30 is arranged on the circuit board body 10 along the length direction of the circuit board body 10, the head end of the power supply line 30 is connected to the head end of the power supply line 20, and the power supply line The tail end of 30 is connected to the tail end of the power line 20.

The head end and the tail end of the power supply line 30 are respectively connected to the head end and the tail end of the power supply line 20, and the middle part of the power supply line 30 is not electrically connected to the middle part of the power supply line 20. The power supply line 30 It can shunt part of the current at the head end of the power line 20 to the tail end of the power line 20, so that the voltage drop at the head end of the power line 20 due to its own resistance is reduced, and the voltage difference between the head end and the tail end of the power line 20 is reduced, which is beneficial to avoid the circuit The brightness of the LED lamp group 50 at the tail end of the board body 10 is reduced. Two driving power sources are not needed, the cost is low and the use is convenient.

Without the power supply circuit 30, since the LED lamp group 50 has multiple parallel branches, the power line 20 is connected to the LED lamp group 50, and the current of the power line 20 is gradually shunted to the parallel branches of the LED lamp group 50. As a result, the current of the power supply line 20 gradually decreases from the head end to the tail end, and the voltage drop per unit length of the power line 20 caused by its own resistance is larger at the head end, which in turn leads to a relatively large voltage difference between the head end and the tail end of the power line 20 Big. When the power supply line 30 is newly added, part of the current at the head end of the power supply line 20 flows through the power supply line 30 to the tail end of the power supply line 20, and the current at the head end of the power supply line 20 decreases, so that the power line 20 is generated by its own resistance per unit length The voltage drop is reduced, and at the same time, the supplementary circuit 30 has a certain effect of raising the voltage at the tail end of the supplementary circuit 30, and finally the voltage difference between the head end and the tail end of the power supply line 20 is reduced. Although the current at the head end of the power line 20 is reduced, the current flowing into each parallel branch of the LED lamp group 50 is almost unchanged, and will not affect the brightness of the LED lamp group 50. The reduced current at the head end of the power line 20 is supplied from the tail end. The LED lamp group 50 emits light, and at the same time, the voltage drop caused by the resistance of the power line 20 is reduced, that is, the power loss of the power line 20 is reduced.

1 to 3, as a preferred embodiment, the power supply line 20 includes a positive power supply line 21 and a negative power supply line 22, the power supply line 30 includes a positive power supply line 31 and a negative power supply line 32, the positive power supply line The head and tail of the wire 31 are respectively connected to the head and tail of the positive power cord 21, and the head and tail of the negative patch cord 32 are respectively connected to the head and tail of the negative power cord 22. The end corresponds to the connection.

The power line 20 generally includes a positive power line 21 and a negative power line 22. The head and tail of the positive power line 31 are connected to the head and tail of the positive power line 21, so that the positive power line 31 can shunt the positive power. The current at the head end of the line 21 reaches the tail end of the positive power line 21, and the voltage at the tail end of the positive power line 21 is increased, thereby reducing the voltage difference between the head end and the tail end of the positive power line 21. At the same time, the head and tail ends of the negative patch cord 32 are correspondingly connected to the head and tail ends of the negative power cord 22, so that a part of the current at the tail end of the negative power cord 22 can flow back from the negative patch cord 32 to the head of the negative power cord 22. Reduce the voltage drop at the end of the negative power line 22 due to the resistance of the negative power line 22 to prevent the voltage at the end of the negative power line 22 from being raised, so that the tail end of the positive power line 21 and the tail end of the negative power line 22 have enough The voltage difference generates a sufficient current to drive the LED lamp group 50 to emit light in the parallel branch at the tail end. The power supply line 30 may also be an embodiment including only the positive power supply line 31.

Referring to FIG. 1, as an embodiment of the position setting of the power supply circuit 20 and the power supply circuit 30, the power supply circuit 20 and the power supply circuit 30 are located on the same printing surface of the circuit board body 10, and are printed on one side The processing method is simpler and the production cost is low.

Referring to FIGS. 2 and 3, as another embodiment of the location of the power supply circuit 20 and the power supply circuit 30, the power supply circuit 20 and the power supply circuit 30 are located on different printed surfaces of the circuit board body 10. Since the power supply line 20 and the power supply line 30 are located on different printed layers, the wiring design can be facilitated, and the circuit board body 10 can be reduced in size. In the case where the power supply line 20 and the power supply line 30 are located on different printed layers, the electrical connection between the power supply line 20 and the power supply line 30 can be realized in the manner of via connection.

Referring to FIG. 1, as an embodiment of the connection between the power supply line 20 and the power supply line 30, the power supply line 20 is connected to the power supply line 30 by welding. Connected by welding, the connection is reliable.

4, as another embodiment for connecting the power supply line 20 and the power supply line 30, it further includes a connector 40 provided with an insertion groove that allows the end of the circuit board body 10 to extend into 41. A conductive member 42 is disposed in the insertion groove 41, and the conductive member 42 can be electrically connected to the power supply line 20 and the power supply line 30 respectively. By inserting the connector 40 with the circuit board body 10, the power supply circuit 20 and the power supply circuit 30 are electrically connected, and the operation is simple and convenient.

Referring to FIG. 4, as a preferred embodiment, the connecting member 40 is provided with a power interface 43 that is electrically connected to the conductive member 42, and the power interface 43 can be electrically connected to an external driving power source. The external drive power is connected to the power interface 43 to be electrically connected to the power line 20, which is convenient to use.

As a preferred embodiment, the circuit board body 10 is a flexible circuit board. In the case of a long length, the flexible circuit board can be bent, which can facilitate layout and installation to meet different usage requirements.

Referring to FIG. 5, the single-ended power supply light strip provided by the present invention includes the low-dropout light strip circuit board in the above-mentioned embodiment, and further includes an LED light group 50 arranged on the circuit board body 10, and the LED light group 50 It is electrically connected to the power line 20.

The LED lamp group 50 may be an implementation that includes multiple parallel branches in parallel, each parallel branch includes a number of light-emitting diodes connected in series and a current limiting resistor, and the input ends of the multiple parallel branches are connected in parallel to form the LED lamp group 50 At the positive terminal, the output terminals of the multiple parallel branches are connected in parallel to form the negative terminal of the LED lamp group 50. The power line 20 includes a positive power line 21 and a negative power line 22, the positive power line 21 is connected to the positive end of the LED lamp group 50, and the negative power line 22 is connected to the negative end of the LED lamp group 50. The head end and tail end of the positive plug wire 31 are respectively connected to the head end and the tail end of the positive power cord 21, and the head end and tail end of the negative plug wire 32 are respectively connected to the head and tail end of the negative power cord 22, In order to achieve the effect of preventing the brightness of the LED lamp group 50 from decreasing at the tail end.

The above-mentioned embodiments are only preferred solutions of the present invention, and the present invention can also have other embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope set by the claims of this application.

Claims

The low-dropout lamp strip circuit board is characterized in that it includes:

Circuit board body (10);

The power line (20) is arranged on the circuit board body (10) along the length of the circuit board body (10), and the head end or the tail end of the power line (20) can be electrically connected to an external driving power source Connected, the power line (20) can be connected with an external LED light group (50);

The power supply circuit (30) is arranged on the circuit board body (10) along the length direction of the circuit board body (10), and the head end of the power supply circuit (30) is connected to the power supply circuit (20) The head end of the power supply line (30) is connected to the tail end of the power line (20).
The low-dropout light strip circuit board according to claim 1, characterized in that: the power supply line (20) includes a positive power supply line (21) and a negative power supply line (22), and the power supply line (30) includes a positive The plug wire (31) and the negative plug wire (32), the head end and the tail end of the positive plug wire (31) are respectively connected to the head end and the tail end of the positive power cord (21), and the negative plug The head end and the tail end of the wire (32) are respectively connected to the head end and the tail end of the negative power cord (22).
The low-dropout lamp strip circuit board according to claim 1, characterized in that: the power supply circuit (20) and the power supply circuit (30) are located on the same printed surface of the circuit board body (10).
The low-dropout lamp strip circuit board according to claim 1, wherein the power supply circuit (20) and the power supply circuit (30) are located on different printed surfaces of the circuit board body (10).
The low-pressure drop lamp strip circuit board according to any one of claims 1 to 4, characterized in that: the power line (20) is connected to the power supply line (30) by welding.
The low-pressure drop lamp strip circuit board according to any one of claims 1 to 4, characterized in that it further comprises a connector (40), and the connector (40) is provided with an end that allows the circuit board body (10) The insertion groove (41) extends into the insertion groove (41), and a conductive element (42) is arranged in the insertion groove (41), and the conductive element (42) can be connected to the power supply line (20) and the power supply line respectively. (30) Electrical connection.
The low-dropout lamp strip circuit board according to claim 6, characterized in that: the connecting member (40) is provided with a power interface (43) electrically connected to the conductive member (42), and the power interface (43) ) It can be electrically connected to an external driving power source.
The low-pressure drop lamp strip circuit board according to any one of claims 1 to 4, wherein the circuit board body (10) is a flexible circuit board.
The single-ended power supply light strip is characterized in that it comprises the low-dropout light strip circuit board according to any one of claims 1 to 8, and further comprises an LED light group (50) arranged on the circuit board body (10), The LED lamp group (50) is electrically connected with the power line (20).