CN207560393U - A LED lighting circuit - Google Patents

Abstract

The utility model provides an L ED lighting circuit, it includes the luminous element that the multiunit is in the same place in series, all the luminous element's of establishing ties total voltage is mains voltage, every luminous element of group includes bridge rectifier circuit and the multiunit L ED lamp cluster by this bridge rectifier circuit drive, each group L0 ED lamp cluster parallel connection of group, every group L1 ED lamp cluster includes L2 ED of a plurality of series connections, wherein the bridge rectifier circuit of adjacent luminous element concatenates in proper order, bridge rectifier circuit comprises four respectively, fourth L3 ED and first L ED set up the one side at the parallelly connected L ED lamp cluster of multiunit, and be connected with power or last group luminous element, second L ED and third L ED set up the opposite side at the parallelly connected L ED of multiunit, and be connected with power or a lower group luminous element, and second L and third L ED are just, the direction that the negative pole was placed on the base plate is opposite with other L ED in the luminous element of same group, can further reduce the application of electronic parts, the cost both can be reduced, the extension life, help energy-saving, it is energy-saving again to simplify the production step.

Description

A LED lighting circuit

technical field

The utility model relates to an LED lighting circuit, in particular to an LED lighting circuit that can be directly driven by commercial power, and the substrate does not need jumpers.

Background technique

At present, light-emitting diodes (LEDs) have begun to be used for lighting purposes, and light-emitting diodes are generally defined as products driven by low-voltage direct current, so there must be a power driver part, but the LED lamp with the driver part is relatively large , low conversion efficiency, additional energy consumption, and high failure rate of the driver, and its lifespan is generally lower than that of the LED lighting circuit, thereby reducing the overall reliability of the product.

The inventor of this case designed an LED lighting circuit that can be directly driven by commercial power, as shown in Figure 1, which includes multiple groups of light-emitting units connected in series, and all the light-emitting units connected in series The total voltage is the mains voltage. Each group of light-emitting units includes a rectification unit and at least one set of LED lamp strings driven by the rectification unit. Each group of LED lamp strings includes a plurality of series-connected LEDs, and the rectification units of adjacent light-emitting units are connected in series. Then, the rectification unit is a bridge rectification circuit and consists of four LEDs.

Two of the LEDs used in the bridge rectifier circuit of the above products are set between two groups of LED light strings. In order to solve the crossover problem of disconnected circuits, an additional jumper wire needs to be set on the substrate (that is, the zero resistance R ₀ in Figure 1 ), but such a design requires an additional jumper for each group of light-emitting units, and the entire LED light may need more than ten in total, which increases the steps and difficulty required for production and processing, and increases the cost of manpower and materials for production .

Utility model content

In view of this, the purpose of this utility model is to provide a lighting circuit that can be directly driven by commercial power, and can not use jumper wires during circuit board wiring and production.

In order to achieve the above purpose, the utility model provides an LED lighting circuit, which includes multiple groups of light emitting units connected in series. Multiple groups of LED light strings driven by a bridge rectifier circuit, each group of LED light strings are connected in parallel, each group of LED light strings includes a plurality of series connected LEDs, wherein the bridge rectifier circuits of adjacent light-emitting units are connected in series in sequence, the bridge The rectifier circuit is composed of a first LED, a second LED, a third LED, and a fourth LED, and it is characterized in that the fourth LED and the first LED are arranged on one side of multiple groups of LED light strings connected in parallel, and are connected to the power supply Or the last group of light emitting units is connected, the second LED and the third LED are arranged on the other side of multiple groups of parallel LED light strings, and are connected to the power supply or the next group of light emitting units, and the second LED and the third LED The direction of the positive and negative poles of the three LEDs on the substrate is opposite to that of other LEDs in the same group of light-emitting units

Preferably, the distance between the fourth LED and the first LED, and the distance between the third LED and the second LED are all half of the distance between the LEDs in the LED light string.

Preferably, there are thirteen groups of the light emitting units, and each group of LED light strings includes five LEDs connected in series.

Preferably, the mains voltage is 220 volts.

The LED lighting circuit of the utility model can reduce the application of electronic parts through the optimized circuit layout, simplify the complexity of production, and further reduce the production cost.

Description of drawings

FIG. 1 is a schematic diagram of an LED lighting circuit in the prior art;

Fig. 2 is a schematic diagram of the first embodiment of the LED lighting circuit of the present invention, which shows a group of light-emitting units;

Fig. 3 is a schematic diagram showing that the number of series or parallel LEDs in the utility model is adjusted and coordinated according to the rules of LEDs;

FIG. 4 is a schematic diagram of a second embodiment of the LED lighting circuit of the present invention, which shows a group of light emitting units.

Description of some tags:

L1: first LED; L2: second LED; L3: third LED, L4: fourth LED; R ₀ : jumper.

Detailed ways

In order to have a further understanding of the structure and the achieved effects of the utility model, the preferred embodiments are described in detail below in conjunction with the accompanying drawings.

As shown in Figure 2, it is the first embodiment of the LED lighting circuit of the present invention. In this embodiment, the length of the LED lamp formed by the lighting circuit is 48 inches. The LEDs form a bridge rectifier circuit, which are respectively the first LED, the second LED, the third LED, and the fourth LED. The bridge rectifier circuit is used to drive two sets of parallel LED light strings. In this embodiment, each LED light string It consists of five LEDs in series, as shown in Figure 2, L5, L6, L7, L8, L9 are connected in series to form a group of LED light strings, and L10, L11, L12, L13, L14 are connected in series to form another group of LED light strings, namely A total of fourteen LEDs form a group of light emitting units.

The difference from the background technology is that the position of two LEDs (ie, the second LED and the third LED) used in the bridge rectifier circuit on the substrate is set on the second group of LED light strings (ie, L10, L11, L12, L13, L14), and its positive and negative poles are placed in the opposite direction to the other LEDs in this group, and can be connected in series with the latter group of light-emitting units through a short connection line.

In addition, in this embodiment, thirteen groups of light-emitting units are connected in series so as to be directly driven by a voltage of 220 volts. This example is based on LEDs with a forward voltage of 2.4 volts, and the total voltage of a group of fourteen LEDs is 16.8 volts. , It is convenient to calculate with 17 volts, and thirteen groups in series are 221 volts, which can be directly driven by 220 volts. The implementation process works satisfactorily. The experiment proves that the proper series and parallel combination of LEDs with fixed characteristics can be directly driven by 220 volts of mains power. The LEDs used as the rectification part only emit half-brightness because they are bridge rectifiers, so the distance between the LEDs should be Halve to maintain an even brightness.

The design of this embodiment makes it possible to avoid the crossover of disconnected circuits in the background art. In the background technology, in order to solve the problem of circuit crossover, a jumper is used (that is, the zero resistance R ₀ in Figure 1), but such a design requires an additional jumper for each group of light-emitting units, and the entire LED lamp may require a total of more than ten. But adopting the scheme of the second embodiment can eliminate the process of repeatedly welding jumper wires, greatly improve production efficiency, and reduce production equipment costs and labor costs, and at the same time, avoid the need for additional flying wires Caused by poor contact, short circuit and interference and other problems.

As shown in Figure 3, the utility model can also use LEDs of different specifications, and it needs to match the number of series and parallel connections. And the light-emitting units of the LED lighting circuit of the present utility model are not limited to thirteen groups, and the LED light strings in each group of light-emitting units are not limited to two groups of parallel connections, and the number of LEDs connected in series in each group of LED light strings is also equal. Not limited to five or six in the first embodiment, the series and parallel arrangement of LEDs in the utility model should be deployed according to the rules of LEDs, so as to match the rules of the mains power supply, so that the external mains power supply can directly drive the LED lighting circuit Normal glow.

As shown in Figure 4, it is the second embodiment of the LED lighting circuit of the present invention. In this embodiment, the positional relationship of each LED on the substrate and the spacing of each LED are the same as those of the first embodiment, but in the circuit The design is simpler, and besides having the advantages of the first embodiment, it can further reduce the production difficulty and cost, and improve the reliability of the product.

The above-mentioned embodiments are only preferred embodiments for fully illustrating the utility model, and the protection scope of the utility model is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present utility model are all within the protection scope of the present utility model. The scope of protection of the utility model shall be determined by the claims.

Claims (4)

1. A LED lighting circuit, comprising a plurality of groups of light-emitting units connected in series, the total voltage of all series-connected light-emitting units is the mains voltage, and each group of light-emitting units includes a bridge rectifier circuit and multiple lights driven by the bridge rectifier circuit A group of LED lamp strings, each group of LED lamp strings are connected in parallel, each group of LED lamp strings includes a plurality of LEDs in series, wherein the bridge rectifier circuits of adjacent light-emitting units are connected in series in sequence, and the bridge rectifier circuits are respectively composed of the first LED , a second LED, a third LED, and a fourth LED, and it is characterized in that the fourth LED and the first LED are arranged on one side of multiple groups of LED light strings connected in parallel, and are connected to the power supply or the previous group of light emitting units. connection, the second LED and the third LED are arranged on the other side of multiple groups of LED light strings connected in parallel, and are connected to the power supply or the next group of light-emitting units, and the positive and negative poles of the second LED and the third LED are in the The direction placed on the substrate is opposite to that of other LEDs in the same group of light emitting units. 2. The LED lighting circuit according to claim 1, characterized in that, the distance between the fourth LED and the first LED, the distance between the third LED and the second LED are all equal to the distance between the LEDs in the LED light string half of the spacing. 3. The LED lighting circuit according to claim 1, characterized in that there are thirteen groups of light emitting units, and each group of LED light strings includes five LEDs connected in series. 4. The LED lighting circuit according to claim 1, wherein the mains voltage is 220 volts.