WO2018112905A1

WO2018112905A1 - Led power supply circuit with dimming function

Info

Publication number: WO2018112905A1
Application number: PCT/CN2016/111768
Authority: WO
Inventors: 孙雪刚
Original assignee: 惠州市优科光电科技有限公司
Priority date: 2016-12-23
Filing date: 2016-12-23
Publication date: 2018-06-28

Abstract

Disclosed is an LED power supply circuit with a dimming function, comprising: an input protection unit, a current-limiting voltage-reducing module, a dimmable rectification chip, a voltage-dividing unit and an LED lamp bank, wherein an input end of the input protection unit is connected to an alternating current power supply; an output end of the input protection unit is connected to the current-limiting voltage-reducing module and the dimmable rectification chip in sequence; two output ends of the dimmable rectification chip are respectively connected to an input end of the voltage-dividing unit and an input end of the LED lamp bank; and an output end of the voltage-dividing unit is connected to another input end of the LED lamp bank. Disclosed is an LED power supply circuit with a dimming function, which is provided with a dimmable rectification chip and can achieve the dimming of an LDE lamp bank by cooperating with an external electronic ballast and a dimmer. There is no need to add a dimmable circuit in a power supply circuit again, and with respect to an existing power supply circuit, the circuit of the present invention has a simple structure, the components occupy a small space, and the practicability is high.

Description

LED power supply circuit with dimming function

[0001] The present invention relates to a power supply circuit, and more particularly to an LED power supply circuit having a dimming function.

Background technique

[0002] LED is called green light source in the field of lighting systems. It has the characteristics of energy saving, environmental protection, long life and small size. It is widely used in various fields such as indication, display, decoration, backlight, general illumination and urban night scene. Because of the energy-saving and high-efficiency characteristics of LEDs, LED lighting will gradually become the mainstream of lighting technology in today's high-energy-saving and emission-reduction calls. China's LED industry has also entered a stage of accelerated development.

[0003] Currently, in lighting devices for LEDs, power supply circuits are provided. The power circuit is relatively complicated. Generally speaking, the power circuit includes a rectifier module, a sampling module, a control module, and a lighting module. The internal circuit connection is more complicated and takes up more space. More importantly, the existing power supply circuit can not realize the dimming function. It needs to be specially equipped with a dimming circuit, and then with the external dimming switch, the dimming function can be realized. If a dimming circuit is added, Will make the power circuit more complicated, LED lighting equipment is large and technical problems

[0004] It is an object of the present invention to overcome the deficiencies in the prior art and to provide an LED power supply circuit having a dimming function.

Problem solution

Technical solution

[0005] The object of the present invention is achieved by the following technical solutions:

[0006] An LED power supply circuit with dimming function, comprising: an input protection unit, a current limiting buck module, a dimmable rectifying chip, a voltage dividing unit and an LED lamp group;

[0007] The input end of the input protection unit is connected to an alternating current power source, and the output end of the input protection unit is sequentially connected with the current limiting buck module and the dimmable rectifying chip, and the dimmable rectifying chip The two output ends are respectively connected to the input end of the voltage dividing unit and an input end of the LED light group, and the output end of the voltage dividing unit is connected to the other input end of the LED light group; [0008] The current limiting buck module includes a first current limiting unit and a second current limiting unit, wherein the first current limiting unit and the second current limiting unit are respectively connected to two input ends of an alternating current power source; The first current limiting unit includes a first resistor and a second resistor connected in parallel; a common connection point of the first resistor and the second resistor is connected to one input end of the alternating current power source, and another common connection point is An input terminal of the tunable rectifier chip is connected; the second current limiting unit includes a third resistor and a fourth resistor connected in parallel; a common connection point of the third resistor and the fourth resistor and an AC power source One input is connected, and the other common connection is connected to the other input of the dimmable rectifier chip.

[0009] As a further preferred solution, the dimmable rectifier chip is a glass passivation protection chip.

[0010] As a further preferred solution, the dimmable rectifying chip is an LX9031A.

[0011] As a further preferred solution, the input protection unit includes a fuse, one end of the fuse is connected to an input end of an AC power source, and the other end is connected to an input end of the current limiting buck module.

[0012] As a further preferred solution, the voltage dividing unit includes a fifth resistor, one end of the fifth resistor is connected to one output end of the dimmable rectifying chip, and the other end is connected to the LED lamp group. One input connection

[0013] As a further preferred solution, the LED lamp set includes a plurality of LED lamps connected in series.

[0014] As a further preferred aspect, an electronic ballast and a dimmer electrically connected to the electronic ballast are further included, the electronic ballast being further connected in series between the AC power source and the input protection module.

Advantageous effects of the invention

Beneficial effect

[0015] Advantages and benefits of the present invention over the prior art are as follows:

[0016] 1. The invention discloses an LED power supply circuit with dimming function, which is provided with a dimmable rectifying chip, and is matched with an external electronic ballast and a dimmer to realize adjustment of the LDE lamp group. Light. There is no need to add a dimmable circuit to the power circuit. Compared with the existing power circuit, the circuit of the present invention has a simple circuit structure, small space occupied by components, and high practicability.

[0017] 2. The invention provides an LED power supply circuit with a dimming function and an input protection unit, which can protect the power supply circuit.

[0018] 3. The invention is provided with a fuse, which can protect the power circuit, when the current is too large, and the connection of the circuit can be broken, and the LED light group and the dimming can be protected. Rectifier chip security , improve the safety of the circuit.

[0019] 4. The invention provides an LED power supply circuit with dimming function, by providing a current limiting step-down module, so that the current and voltage flowing through the dimmable rectifying chip satisfy the rated value of the chip, and no current or voltage occurs. Excessively burnt out the dimmable rectifier chip.

[0020] 5. The dimmable rectifying chip of the present invention is a glass passivation protection chip, which has the characteristics of good performance and high temperature resistance, and the chip can quickly convert the AC power source into a DC power source conforming to the LED lamp group.

[0021] 6. The LED power supply circuit with dimming function of the present invention has a simple circuit structure and can have LED dimming function in the case of fewer components, which ultimately makes the LED lighting device small in size and cost-effective. low.

Brief description of the drawing

DRAWINGS

1 is a schematic block diagram of an LED power supply circuit with a dimming function according to an embodiment of the present invention;

2 is a circuit diagram of an LED power supply circuit having a dimming function according to an embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[0024] In order to facilitate the understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the invention are given in the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided for the purpose of providing a more thorough understanding of the present disclosure.

[0025] It is to be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or. The terms "vertical", "horizontal", "left", "right", and the like, as used herein, are for illustrative purposes only and are not meant to be the only embodiment.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the present invention is for the purpose of describing particular embodiments, and is not intended to limit the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items. [0027] The conventional power supply circuit does not have a dimming function, and the existing circuit is complicated and the components occupy a large space. Adding a dimming circuit will make the power circuit more complicated and bulkier. Based on this, the present invention provides a power supply circuit having a dimming function.

Referring to FIG. 1 , an LED power supply circuit 10 having a dimming function includes: an input protection unit 100 , a current limiting buck module 200 , a dimmable rectifying chip 300 , a voltage dividing unit 400 , and an LED lamp group 500 . . The LED light set 500 includes a plurality of LED lights connected in series.

[0029] The input end of the input protection unit 100 is connected to an AC power source, and the output end of the input protection unit 100 is sequentially connected to the current limiting buck module 200 and the dimming rectifier chip 300. The two output ends of the dimming rectifier chip 300 are respectively connected to the input end of the voltage dividing unit 400 and an input end of the LED light group 500. The output end of the voltage dividing unit 400 and the LED light group 500 The other input is connected. See Figure 2. The LED power supply circuit with dimming function further includes an electronic ballast 600 and a dimmer K electrically connected to the electronic ballast 600, the electronic ballast being further connected in series with an alternating current power source and the input protection Between modules.

Referring to FIG. 1 and FIG. 2 together, the current limiting buck module 200 includes a first current limiting unit 210 and a second current limiting unit 220, and the first current limiting unit 210 and the second limit. The flow unit 220 is respectively connected to the two input ends of the AC power source; the first current limiting unit 210 includes a first resistor R1 and a second resistor R2 connected in parallel; the first resistor R1 and the second resistor R2 a common connection point is connected to one input end of the AC power source, and another common connection point is connected to an input end of the dimmable rectifier chip 300; the second current limiting unit 220 includes a third resistor R3 connected in parallel and a fourth resistor R4; a common connection point of the third resistor R3 and the fourth resistor R4 is connected to one input end of the alternating current power source, and another common connection point and another input of the dimmable rectifier chip 300 End connection.

[0031] Specifically, in FIG. 2, the dimmable rectifier chip is Ul, and the LED lamp group is a combination of a plurality of LED lamps. The AC power source includes a live (L) and a neutral (N) connection to the electronic ballast 600, respectively. The first output end of the electronic ballast 600 is connected to a common connection point of the first resistor R1 and the second resistor R2, and the common connection point serves as an input end of the first current limiting unit 210. Another common connection point of the first resistor R1 and the second resistor R2 is connected to the first pin of the dimmable rectifying chip 300 as an output end of the first current limiting unit 210.

[0032] the second output end of the electronic ballast 600 and the third resistor R3 and the fourth resistor R4 A common connection point is connected, and the common connection point is an input end of the second current limiting unit 220. Another common connection point of the third resistor R3 and the fourth resistor R4 is connected to the second pin of the dimmable rectifier chip 300 as an output end of the second current limiting unit 220.

[0033] The electronic ballast 600 is also connected to the dimmer K, which functions to directly dim the LED lamp group.

[0034] It is to be noted that the dimmable rectifying chip 300 is a glass passivation protection chip. The dimmable rectifying chip 300 is an LX9031A. The dimmable rectifying chip 300 has the functions of rectifying and dimming, and the dimming of the LED lamp group can be realized as long as the electronic ballast and the dimming switch are externally connected, and no other dimming circuit and other electronic components are needed. The device can also have the function of LED dimming. At the same time, the power circuit has a simple circuit structure and few components, which ultimately makes the LED lighting device small in size and low in cost.

[0035] It should be noted that the input protection unit 100 includes a fuse F, one end of the fuse F is connected to an input end of an AC power source, and the other end is connected to an input of the current limiting buck module 200. End connection. In Fig. 2, an embodiment of the fuse F, one end of the fuse F is connected to the second output end of the electronic ballast, and the other end is connected to the input end of the second current limiting unit 220.

[0036] In another embodiment of the fuse F, one end of the fuse F is connected to the first output end of the electronic ballast, and the other end is connected to the input end of the first current limiting unit 210.

[0037] The fuse F can function to protect the power supply circuit, and when the current is too large, the connection of the circuit can be interrupted, and the safety of the LED lamp group and the dimmable rectifier chip can be improved. The safety of this circuit.

[0038] It is to be noted that the voltage dividing unit 400 includes a fifth resistor R5, one end of the fifth resistor R5 is connected to an output end of the dimmable rectifying chip 300, and the other end is connected to the LED. The other input of the light set 500 is connected.

The above-described embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

Claim

An LED power supply circuit with dimming function, comprising: an input protection unit, a current limiting buck module, a dimmable rectifying chip, a voltage dividing unit and an LED lamp group; and an input end of the input protection unit An output of the input protection unit is connected to the current limiting buck module and the dimming rectifier chip, and two output ends of the dimming rectifier chip and the voltage dividing unit respectively The input end is connected to an input end of the LED light group, and the output end of the voltage dividing unit is connected to another input end of the LED light group;

The current limiting step-down module includes a first current limiting unit and a second current limiting unit, wherein the first current limiting unit and the second current limiting unit are respectively connected to two input ends of an alternating current power source; The current limiting unit includes a first resistor and a second resistor connected in parallel; a common connection point of the first resistor and the second resistor is connected to one input end of the alternating current power source, and another common connection point and the adjustable An input terminal of the optical rectifier chip is connected; the second current limiting unit includes a third resistor and a fourth resistor connected in parallel; a common connection point of the third resistor and the fourth resistor and one input of the alternating current power source The terminal connection is connected to another input terminal of the dimmable rectifier chip.

The LED power supply circuit with dimming function according to claim 1, wherein the dimmable rectifying chip is a glass passivation protection chip.

The LED power supply circuit with dimming function according to claim 1, wherein the dimmable rectifying chip is an LX9031A.

The LED power supply circuit with dimming function according to claim 1, wherein the input protection unit comprises a fuse, one end of the fuse is connected to an input end of an alternating current power source, and the other end is opposite to the limit An input of the flow buck module is connected.

The LED power supply circuit with dimming function according to claim 1, wherein the voltage dividing unit comprises a fifth resistor, and one end of the fifth resistor is connected to an output end of the dimmable rectifier chip. The other end is connected to the other input of the LED light group. The LED power supply circuit with dimming function according to claim 1, wherein the LED lamp group comprises a plurality of LED lamps connected in series. [Claim 7] The LED power supply circuit with dimming function according to claim 1, further comprising an electronic ballast and a dimmer electrically connected to the electronic ballast, the electronic town The flow device is also connected in series between the AC power source and the input protection module.