LED lamp panel adopting constant-current driving chip

Abstract

The utility model relates to an LED lamp panel adopting a constant current driving chip, which is characterized in that a power supply circuit comprises a protection circuit and a rectifier bridge D1, and two alternating current input ends of the rectifier bridge D1 are connected with a mains supply through the protection circuit; the input end of the constant-current driving chip U1 is connected to the cathode direct-current output end of the rectifier bridge D1; the lighting circuit is composed of a plurality of LED lamp beads connected in parallel. The two ends of the lighting circuit are connected with the positive direct-current output end of the rectifier bridge D1 and the output end of the constant-current driving chip U1 respectively. According to the utility model, the SM2082EGS constant-current driving chip is adopted to replace an ME860 chip, the circuit design of the PCB is optimized, and the use of a voltage-dividing color ring resistor and a filter capacitor is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of LED lamp driving, in particular to an LED lamp board adopting a constant current driving chip. Background Art

[0002] The household power supply is a high-voltage sine alternating current of 220V / 50Hz. After being modulated by the SM2082EGS constant current driving chip, a direct current signal with a frequency of 50Hz can be obtained. The stroboscopic frequency of the LED lamp driven by the modulated direct current is 50Hz, which is invisible to the naked eye. At present, the high-voltage LED lamp boards on the market generally use the ME8608 chip to provide high-voltage direct current. For the ME8608 chip LED lamp board, the modulation circuit PCB design requires multiple color ring resistors and filter capacitors, with a high cost, and it cannot be directly driven by the household power supply, resulting in high power consumption.

[0003] To sum up, in view of the above technical problems existing in the high-voltage LED lamp boards on the market, it is urgent to research and develop an LED lamp board that can be directly connected to the household power supply and further reduce the manufacturing cost and power consumption. Content of the Utility Model

[0004] In order to solve the problems existing in the prior art, the utility model provides an LED lamp board adopting a constant current driving chip, which uses the SM2082EGS constant current driving chip to replace the ME860 chip and optimizes the circuit design of the PCB board, effectively reducing the use of voltage-dividing color ring resistors and filter capacitors.

[0005] The technical solutions adopted by the utility model to solve the above technical problems are as follows:

[0006] An LED lamp board adopting a constant current driving chip, comprising:

[0007] A power supply circuit, including a protection circuit and a rectifier bridge D1. The two AC input terminals of the rectifier bridge D1 are connected to the mains power supply through the protection circuit;

[0008] A constant current driving chip U1, the input terminal of the constant current driving chip U1 is connected to the negative DC output terminal of the rectifier bridge D1;

[0009] A lighting circuit, which is composed of a plurality of parallel-connected LED lamp beads; both ends of the lighting circuit are respectively connected to the positive DC output terminal of the rectifier bridge D1 and the output terminal of the constant current driving chip U1.

[0010] As a further improved technical solution of the utility model, the protection circuit is composed of a fuse resistor F1 and a varistor RV1. The fuse resistor F1 is connected in series between one AC input terminal of the rectifier bridge D1 and the live wire L of the mains power supply, and both ends of the varistor RV1 are connected in parallel between the live wire L and the neutral wire N of the mains power supply.

[0011] As a further improved technical solution of the present utility model, the model of the constant current drive chip U1 is SM2082EGS. The input end of the constant current drive chip U1 has a pin GND, a pin REXT, and two pins NC, which are all connected to the negative DC output end of the rectifier bridge D1. The output end of the constant current drive chip U1 has an OUT pin and three NC pins, which are all connected to the negative pole of the LED lamp beads. A capacitor C1 is connected in series between the input end and the output end of the constant current drive chip U1.

[0012] As a further improved technical solution of the present utility model, the constant current drive chip U1 has a pin EPAD, and the pin EPAD is connected to the negative DC output end of the rectifier bridge D1. A current limiting resistor R1 is connected to the negative DC output end of the rectifier bridge D1. One pin REXT and two pins NC at the input end of the constant current drive chip U1 are respectively connected to the other end of the current limiting resistor R1.

[0013] As a further improved technical solution of the present utility model, the model of the fuse resistor F1 is 100R, the model of the varistor RV1 is 511K, the model of the rectifier bridge D1 is MB 10F, the current limiting resistor R1 is a REXT resistor, and the model of the capacitor C1 is 10nF / 1000V.

[0014] As a further improved technical solution of the present utility model, there are three LED lamp beads, and all of them are fixed by PCB board soldering.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] The present utility model uses an SM2082EGS constant current drive chip to replace the ME8608 chip, optimizes the circuit PCB design, and effectively reduces the use of voltage-dividing color ring resistors and filter capacitors without changing the overall structure of the LED lamp board. All the electronic components of the LED lamp board with the SM2082EGS constant current drive chip are in the form of PCB soldering. Using the voltage-dividing principle of a series circuit, the use of a transformer is not required, and the cost is relatively low. The LED lamp board using the SM2082EGS constant current drive chip can replace high-voltage LED lamps. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1This is the circuit schematic diagram of the present utility model.

[0019] Figure 2 This is the top view of the present utility model.

[0020] Figure 3 This is the side view of the present utility model.

[0021] The reference numerals in the figure are: 1. LED lamp bead; 2. PCB board; 3. Constant current drive chip U1. Specific embodiments

[0022] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] Referring to the attached drawings, this embodiment discloses an LED lamp board using a constant current drive chip, including a power supply circuit, a constant current drive chip U1, and a lighting circuit.

[0024] The power supply circuit includes a protection circuit and a rectifier bridge D1. Two AC input terminals of the rectifier bridge D1 are connected to the mains power supply through the protection circuit; the input terminal of the constant current drive chip U1 is connected to the negative DC output terminal of the rectifier bridge D1; the lighting circuit consists of three parallel-connected LED lamp beads, and all are fixed by PCB board soldering to realize the soldering processing of the LED lamp beads. Both ends of the lighting circuit are respectively connected to the positive DC output terminal of the rectifier bridge D1 and the output terminal of the constant current drive chip U1.

[0025] In this embodiment, the protection circuit is composed of a fuse resistor F1 and a varistor RV1. The fuse resistor F1 is connected in series between one AC input terminal of the rectifier bridge D1 and the live wire L of the mains power supply, and both ends of the varistor RV1 are connected in parallel between the live wire L and the neutral wire N of the mains power supply.

[0026] The model of the constant current drive chip U1 is SM2082EGS. The input terminal of the constant current drive chip U1 has a pin GND, a pin REXT, and two pins NC, and are all connected to the negative DC output terminal of the rectifier bridge D1. The output terminal of the constant current drive chip U1 has an OUT pin and three NC pins, and are all connected to the negative electrode of the LED lamp bead. A capacitor C1 is connected in series between the input terminal and the output terminal of the constant current drive chip U1.

[0027] The constant current drive chip U1 has a pin EPAD, and the pin EPAD is connected to the negative DC output terminal of the rectifier bridge D1. The negative DC output terminal of the rectifier bridge D1 is connected with a current limiting resistor R1. One pin REXT and two pins NC at the input end of the constant current drive chip U1 are respectively connected to the other end of the current limiting resistor R1.

[0028] Specifically, the model of the fuse resistor F1 is 100R, the model of the varistor RV1 is 511K, the model of the rectifier bridge D1 is MB 10F, the current limiting resistor R1 is the REXT resistor, and the model of the capacitor C1 is 10nF / 1000V.

[0029] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical method of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical method of the present invention.

Claims

1. An LED light board using a constant current drive chip, characterized in that, Including: A power supply circuit, including a protection circuit and a rectifier bridge D1. Two AC input terminals of the rectifier bridge D1 are connected to the mains power supply through the protection circuit; A constant current driving chip U1. The input terminal of the constant current driving chip U1 is connected to the negative DC output terminal of the rectifier bridge D1; A lighting circuit, which is composed of several parallel-connected LED lamp beads. Two ends of the lighting circuit are respectively connected to the positive DC output terminal of the rectifier bridge D1 and the output terminal of the constant current driving chip U1.

2. The LED light board using a constant current drive chip according to claim 1, wherein The protection circuit is composed of a fuse resistor F1 and a varistor RV1. The fuse resistor F1 is connected in series between one AC input terminal of the rectifier bridge D1 and the live wire L of the mains power supply. Two ends of the varistor RV1 are connected in parallel between the live wire L and the neutral wire N of the mains power supply.

3. The LED light board using a constant current drive chip according to claim 2, characterized in that, The model of the constant current driving chip U1 is SM2082EGS. The input terminal of the constant current driving chip U1 has a pin GND, a pin REXT, and two pins NC, and are all connected to the negative DC output terminal of the rectifier bridge D1. The output terminal of the constant current driving chip U1 has an OUT pin and three NC pins, and are all connected to the negative poles of the LED lamp beads. A capacitor C1 is connected in series between the input terminal and the output terminal of the constant current driving chip U1.

4. The LED light board using a constant current drive chip according to claim 3, characterized in that, The constant current driving chip U1 has a pin EPAD, and the pin EPAD is connected to the negative DC output terminal of the rectifier bridge D1. A current limiting resistor R1 is connected to the negative DC output terminal of the rectifier bridge D1. One pin REXT and two pins NC at the input terminal of the constant current driving chip U1 are respectively connected to the other end of the current limiting resistor R1.

5. The LED lamp board using a constant current driving chip according to claim 1, characterized in that, The model of the fuse resistor F1 is 100R, the model of the varistor RV1 is 511K, the model of the rectifier bridge D1 is MB 10F, the current limiting resistor R1 is a REXT resistor, and the model of the capacitor C1 is 10nF / 1000V.

6. The LED lamp board using a constant current drive chip according to claim 1, characterized in that, There are three LED lamp beads, and they are all fixed by PCB board soldering.

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