CN210641110U

CN210641110U - Double-color LED drive circuit based on bridge unit and LED lighting device

Info

Publication number: CN210641110U
Application number: CN201921666276.8U
Authority: CN
Inventors: 张素贞
Original assignee: Zhongshan Gujing Photoelectric Co Ltd
Current assignee: Zhongshan Gujing Photoelectric Co Ltd
Priority date: 2019-10-01
Filing date: 2019-10-01
Publication date: 2020-05-29
Anticipated expiration: 2029-10-01

Abstract

The utility model provides a double-colored LED drive circuit and LED lighting device based on bridge unit. The bicolor LED drive circuit based on the bridge unit comprises an LED illumination unit, wherein the LED illumination unit comprises: a plurality of LED bridge units that concatenate in proper order, each LED bridge unit includes: the LED lamp comprises a first LED half-bridge and a second LED half-bridge which are electrically connected in parallel, wherein the first LED half-bridge comprises a plurality of first LED lamp beads which are sequentially connected in series, and the second LED half-bridge comprises a plurality of second LED lamp beads which are sequentially connected in series; in each LED bridge unit, the conducting directions of a first LED lamp bead in the first LED half bridge and a second LED lamp bead in the second LED half bridge are opposite. The utility model also provides an use double-colored LED drive circuit's based on bridge unit LED lighting device.

Description

Double-color LED drive circuit based on bridge unit and LED lighting device

Technical Field

The utility model relates to a LED technical field specifically, relates to a double-colored LED drive circuit and LED lighting device based on bridge unit.

Background

The LED is called as a fourth-generation light source, has the characteristics of energy conservation, environmental protection, safety, long service life, low power consumption, high brightness, micro size, shock resistance, easiness in dimming, light beam concentration, simplicity and convenience in maintenance and the like, and can be widely applied to the fields of various indications, display, decoration, backlight sources, common illumination and the like.

At present, two independent LED lighting circuits are generally required to be arranged in an LED driving circuit capable of generating double-color lighting, so that the double-color LED driving circuit is too complex, and the difficulty of assembling an actual LED product can be increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the shortcoming that exists among the prior art, and provide a double-colored LED drive circuit based on bridge unit.

A bi-color LED drive circuit based on a bridge unit, comprising an LED lighting unit, the LED lighting unit comprising: a plurality of LED bridge units that concatenate in proper order, each LED bridge unit includes: the LED lamp comprises a first LED half-bridge and a second LED half-bridge which are electrically connected in parallel, wherein the first LED half-bridge comprises a plurality of first LED lamp beads which are sequentially connected in series, and the second LED half-bridge comprises a plurality of second LED lamp beads which are sequentially connected in series; in each LED bridge unit, the conducting directions of a first LED lamp bead in the first LED half bridge and a second LED lamp bead in the second LED half bridge are opposite.

Preferably, the positive connection terminal of the first LED half-bridge is electrically connected to the negative connection terminal of the second LED half-bridge, and the negative connection terminal of the first LED half-bridge is electrically connected to the positive connection terminal of the second LED half-bridge.

Preferably, the number of the first LED lamp beads in the first LED half bridge is the same as that of the second LED lamp beads in the second LED half bridge.

Preferably, the first LED lamp bead and the second LED lamp bead are different color light sources.

Preferably, the method further comprises the following steps: the electrode switching module is provided with two direct current output ends, and positive and negative switching output can be carried out between the two direct current output ends; and two direct current output ends of the electrode switching module are respectively and electrically connected with two input ends of the LED lighting unit.

Preferably, the electrode switching module includes: a PWM converter, a first electrode circuit and a second electrode circuit; pin OUTA and pin OUTB of the PWM converter may alternately output a high level and a low level, respectively; the first electrode circuit comprises a first direct current output end, a first MOS tube and a second MOS tube, wherein the first MOS tube and the second MOS tube are respectively electrically connected with the first direct current output end; the second electrode circuit comprises a second direct current output end, and a third MOS tube and a fourth MOS tube which are respectively electrically connected with the second direct current output end, wherein the third MOS tube is electrically connected with the positive electrode output end, and the fourth MOS tube is electrically connected with the negative electrode output end; the first MOS tube and the fourth MOS tube are respectively and electrically connected with the pin OUTB, and the second MOS tube and the third MOS tube are respectively and electrically connected with the pin OUTA; when the pin OUTB outputs a high level and the pin OUTA outputs a low level, the first MOS tube and the fourth MOS tube are respectively conducted, the second MOS tube and the third MOS tube are respectively in a broken circuit state, the first direct current output end outputs a positive pole, and the second direct current output end outputs a negative pole; when the pin OUTB outputs a low level and the pin OUTA outputs a high level, the first MOS transistor and the fourth MOS transistor are in an open circuit state, the second MOS transistor and the third MOS transistor are turned on, the first dc output terminal outputs a negative electrode, and the second dc output terminal outputs a positive electrode.

Preferably, the first electrode circuit and the second electrode circuit are further electrically connected to an overcurrent protection pin OCP-IN of the PWM converter, respectively, for implementing an overcurrent protection function of the electrode switching module.

Preferably, the PWM control module includes a PWM chip, a first photo coupler and a second photo coupler, pin 3 and pin 4 of the PWM chip alternately output PWM signals at a high level and a low level, respectively, and pin 3 and pin 4 of the PWM chip are electrically connected to pin INB and pin INA of the PWM converter through the first photo coupler and the second photo coupler, respectively.

Preferably, a pin 6 of a PWM chip of the PWM control module is electrically connected to the adjustable constant current power supply, and the pin 6 outputs a PWM signal to control the adjustable constant current power supply to adjust the current so as to control the dimming of the LED.

An LED lighting device employing the bridge unit-based two-color LED driving circuit as described above.

The utility model has the advantages that:

in the bridge unit-based double-color LED driving circuit and the LED illumination device, the LED illumination unit adopts a similar bridge circuit structure, so that the LED illumination unit can realize double-color illumination without distinguishing a positive electrode and a negative electrode;

in the control unit, the adjustable constant current power supply is electrically connected with the electrode switching module, and the PWM control module is also electrically connected with the adjustable constant current power supply and the electrode switching module respectively, so that the PWM control module can directly control the LED lighting unit to realize color temperature switching through the electrode switching module, and can also directly control the current through the adjustable constant current power supply to adjust the brightness of the LED lighting unit.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced 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 without inventive work, wherein:

fig. 1 is a structural block diagram of a bridge unit-based two-color LED driving circuit provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an adjustable constant current power supply in the bridge unit-based two-color LED driving circuit shown in fig. 1;

FIG. 3 is a schematic diagram of a PWM control module in the bridge unit-based two-color LED driving circuit shown in FIG. 1;

FIG. 4 is a schematic diagram of the structure of an electrode switching module in the bridge unit-based two-color LED driving circuit shown in FIG. 1;

FIG. 5 is a schematic diagram of an embodiment of an LED lighting unit in the bridge unit based bi-color LED driver circuit of FIG. 1;

fig. 6 is a schematic structural diagram of still another embodiment of the LED lighting unit.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The utility model provides a LED lighting device, LED lighting device can send double-colored illumination photochromic. Specifically, the LED lighting device adopts a bridge unit-based two-color LED driving circuit to realize LED driving lighting.

As shown in fig. 1 to 6, the bridge unit-based two-color LED driving circuit includes an adjustable constant current power supply 10, a PWM control module 20, an electrode switching module 30, and an LED lighting unit 40. The adjustable constant current power supply 10 is electrically connected with the electrode switching module 30, the PWM control module 20 is electrically connected with the adjustable constant current power supply 10 and the electrode switching module 30, and the electrode switching module 30 is electrically connected with the LED lighting unit 40.

Specifically, the adjustable constant current power supply 10 is directly connected to the commercial power, and rectifies the ac commercial power into dc power. Specifically, the adjustable constant current power supply 10 is a constant current power supply circuit for driving an LED, the adjustable constant current power supply 10 outputs a direct current, an anode of the adjustable constant current power supply 10 is electrically connected to an input terminal of the electrode switching module 30, and a cathode of the adjustable constant current power supply 10 is grounded. In this embodiment, the adjustable constant current power supply 10 is a constant current power supply based on a dimmable LED driving controller IC (8), and the model of the dimmable LED driving controller IC (8) is: RT 7306.

The PWM control module 20 includes a PWM chip J1, a first photo coupler U1, and a second photo coupler U2. The PWM chip J1 can receive an adjusting instruction through a 2.4G module, a Bluetooth module, a Temao eidolon module or a dimming module, and send out a corresponding PWM signal to perform dimming according to the received adjusting instruction.

In this embodiment, the pin 3 and the pin 4 of the PWM chip J1 alternately output PWM signals at a high level and a low level, respectively, and the pin 3 and the pin 4 of the PWM chip J1 are electrically connected to the first photo coupler U1 and the second photo coupler U2, respectively, and electrically connected to the electrode switching module 30 for switching between positive and negative electrodes.

Moreover, a pin 6 of the PWM chip J1 of the PWM control module 20 is electrically connected to the adjustable constant current power supply 10, and the pin 6 outputs a PWM signal to control the adjustable constant current power supply 10 to adjust the current so as to control the brightness adjustment of the LED.

In this embodiment, the pin 6 of the PWM chip J1 is electrically connected to the pin 4 of the dimmable LED driving controller IC (8), so that the PWM chip J1 controls the dimmable LED driving controller IC (8) to adjust the output current of the adjustable constant current power supply 10 through a PWM signal, thereby realizing the dimming of the LED.

The electrode switching module 30 is provided with two direct current output ends OUT1 and OUT2, and positive and negative switching output can be performed between the two direct current output ends OUT1 and OUT 2; the two dc output terminals OUT1, OUT2 of the electrode switching module 30 are electrically connected to the two input terminals IN1, IN2 of the LED lighting unit 40, respectively.

Specifically, the electrode switching module 30 includes: PWM converter U1, first electrode circuit 31, and second electrode circuit 32. The pin OUTA and the pin OUTB of the PWM converter U1 may alternately output a high level and a low level, respectively. And the pin 3 and the pin 4 of the PWM chip J1 are electrically connected to the pin INB and the pin INA of the PWM converter U1 through the first photo coupler U1 and the second photo coupler U2, respectively. Preferably, the PWM converter U1 is a PWM converter of model JL 2233.

The first electrode circuit 31 includes a first dc output terminal OUT1, and a first MOS transistor Q8 and a second MOS transistor Q4 electrically connected to the first dc output terminal OUT1, respectively, where the first MOS transistor Q8 is electrically connected to the positive output terminal of the adjustable constant current power supply 10, and the second MOS transistor Q4 is electrically connected to the negative output terminal of the adjustable constant current power supply 10.

In this embodiment, the pins D of the first MOS transistor Q8 and the second MOS transistor Q4 are electrically connected to the first dc output terminal OUT1, respectively; the pin S of the first MOS transistor Q8 is electrically connected to the positive output terminal of the adjustable constant current power supply 10, and the pin S of the second MOS transistor Q4 is grounded; the pin G of the first MOS transistor Q8 is electrically connected to the pin OUTB, and the pin G of the second MOS transistor Q4 is electrically connected to the pin OUTA.

The second electrode circuit 32 includes a second dc output terminal OUT2, a third MOS transistor Q7 and a fourth MOS transistor Q5 electrically connected to the second dc output terminal OUT2, respectively, the third MOS transistor Q7 is electrically connected to the positive output terminal of the adjustable constant current power supply 10, and the fourth MOS transistor Q5 is electrically connected to the negative output terminal of the adjustable constant current power supply 10.

Specifically, the pins D of the third MOS transistor Q7 and the fourth MOS transistor Q5 are electrically connected to the second dc output terminal OUT2, respectively; an S pin of the third MOS transistor Q7 is electrically connected to the positive output terminal of the adjustable constant current power supply 10, and an S pin of the fourth MOS transistor Q5 is grounded; the pin G of the third MOS transistor Q7 is electrically connected to the pin OUTA, and the pin G of the fourth MOS transistor Q5 is electrically connected to the pin OUTB.

It should be noted that the first dc output terminal OUT1 is further grounded through a resistor R72, and the second dc output terminal OUT2 is further grounded through a resistor R70; the resistor R72 and the resistor R70 are kiloohm resistors.

IN addition, the first electrode circuit 31 and the second electrode circuit 32 are also electrically connected to an overcurrent protection pin OCP-IN of the PWM converter U1, respectively, for implementing an overcurrent protection function of the electrode switching module. In the present embodiment, the S pin of the second MOS transistor Q4 of the first electrode circuit 31 and the S pin of the fourth MOS transistor Q5 of the second electrode circuit 32 are both grounded through a resistor R56. One end of the resistor R56 is also electrically connected to an overcurrent protection pin OCP-IN of the PWM converter U1, so that overcurrent detection of the first electrode circuit 31 and the second electrode circuit 32 is realized, and an overcurrent protection function of the electrode switching module 30 is further realized.

The working process of the electrode switching module 30 is as follows:

when a pin OUTB of the PWM converter U1 outputs a high level and a pin OUTA outputs a low level, the first MOS transistor Q8 and the fourth MOS transistor Q5 are respectively turned on, the second MOS transistor Q4 and the third MOS transistor Q7 are respectively in an off state, the first dc output terminal OUT1 outputs a positive electrode, and the second dc output terminal outputs a negative electrode;

when a pin OUTB of the PWM converter U1 outputs a low level and a pin OUTA outputs a high level, the first MOS transistor Q8 and the fourth MOS transistor Q5 are in an off state, the second MOS transistor Q4 and the third MOS transistor Q7 are turned on, the first dc output terminal OUT1 outputs a negative electrode, and the second dc output terminal outputs a positive electrode;

thus, the electrode switching module 30 completes the anode-cathode switching process.

The LED lighting unit 40 includes a first input terminal IN1, a second input terminal IN2, and a plurality of LED bridge units 41 connected IN series between the first input terminal IN1 and the second input terminal IN2 IN sequence. The first and second dc output terminals OUT1 and OUT2 of the electrode switching module 30 are electrically connected to the first and second input terminals IN1 and IN2, respectively, of the LED lighting unit 40.

In this embodiment, each of the LED bridge units 41 includes: parallelly connected electric connection's first LED half-bridge 401 and second LED half-bridge 402, first LED half-bridge 401 is including a plurality of first LED lamp pearls that concatenate in proper order, second LED half-bridge 402 is including a plurality of second LED lamp pearls that concatenate in proper order. In each LED bridge unit 41, the conducting directions of the first LED lamp bead in the first LED half bridge 401 and the second LED lamp bead in the second LED half bridge 402 are opposite. Specifically, the positive connection terminal of the first LED half bridge 401 is electrically connected to the negative connection terminal of the second LED half bridge 402, and the negative connection terminal of the first LED half bridge 401 is electrically connected to the positive connection terminal of the second LED half bridge 402.

In order to ensure the balanced brightness of the two LED half bridges, the number of the first LED lamp beads in the first LED half bridge 401 is the same as that of the second LED lamp beads in the second LED half bridge 402. Moreover, first LED half-bridge 401 with LED lamp pearl quantity in the second LED half-bridge 402 can be one, two, three or at least four, the utility model discloses do not restrict to this.

In order to realize illumination with different colors, the first LED lamp bead and the second LED lamp bead are different color light sources.

It should be noted that the bridge unit-based two-color LED driving circuit can realize dual functions of color temperature adjustment and brightness adjustment, and the specific implementation manner is as follows:

1. color temperature adjustment process

After the PWM chip J1 of the PWM control module 20 receives the color temperature adjustment instruction, the PWM chip J1 outputs corresponding PWM signals to the PWM converter U1 of the electrode switching module 30 through the pin 3 and the pin 4, respectively, according to the color temperature adjustment instruction, so as to control the first dc output terminal OUT1 and the second dc output terminal of the electrode switching module 30 to perform positive and negative polarity switching;

with the switching of the positive and negative electrodes of the electrode switching module 30, the lamp beads in the first LED half-bridge 401 and the second LED half-bridge 402 in the LED lighting unit 40 are alternately turned on and off, so that the color temperature adjustment of two-color light emission can be realized.

2. Brightness adjustment process

After the PWM chip J1 of the PWM control module 20 receives the brightness adjustment instruction, the PWM chip J1 outputs a corresponding PWM signal to the adjustable constant current power supply 10 through the pin 6 according to the brightness adjustment instruction, so as to control the adjustable constant current power supply 10 to output a corresponding current value, thereby adjusting the brightness.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all of which utilize the equivalent structure or equivalent flow transformation made by the content of the specification of the present invention, or directly or indirectly applied to other related technical fields, all included in the same way in the patent protection scope of the present invention.

Claims

1. A bicolor LED drive circuit based on a bridge unit is characterized by comprising an LED illumination unit,

the LED illumination unit includes: a plurality of LED bridge units that concatenate in proper order, each LED bridge unit includes: the LED lamp comprises a first LED half-bridge and a second LED half-bridge which are electrically connected in parallel, wherein the first LED half-bridge comprises a plurality of first LED lamp beads which are sequentially connected in series, and the second LED half-bridge comprises a plurality of second LED lamp beads which are sequentially connected in series;

in each LED bridge unit, the conducting directions of a first LED lamp bead in the first LED half bridge and a second LED lamp bead in the second LED half bridge are opposite.

2. The bridge-unit based bi-color LED driving circuit of claim 1, wherein the positive connection terminal of the first LED half-bridge is electrically connected to the negative connection terminal of the second LED half-bridge, and the negative connection terminal of the first LED half-bridge is electrically connected to the positive connection terminal of the second LED half-bridge.

3. The bridge-unit-based bi-color LED driver circuit of claim 1, wherein a number of first LED beads in the first LED half-bridge and a number of second LED beads in the second LED half-bridge are the same.

4. The bridge-unit-based bi-color LED driving circuit of claim 1, wherein the first LED lamp bead and the second LED lamp bead are different color light sources.

5. The bridge-cell based bi-color LED driver circuit of claim 1, further comprising: the electrode switching device comprises an adjustable constant current power supply, a PWM control module and an electrode switching module, wherein the adjustable constant current power supply is electrically connected with the electrode switching module, and the PWM control module is also electrically connected with the adjustable constant current power supply and the electrode switching module respectively;

the electrode switching module is provided with two direct current output ends, and positive and negative switching output can be carried out between the two direct current output ends; and two direct current output ends of the electrode switching module are respectively and electrically connected with two input ends of the LED lighting unit.

6. The bridge-cell based bi-color LED drive circuit of claim 5, wherein the electrode switching module comprises: a PWM converter, a first electrode circuit and a second electrode circuit;

pin OUTA and pin OUTB of the PWM converter may alternately output a high level and a low level, respectively;

the first electrode circuit comprises a first direct current output end, a first MOS tube and a second MOS tube, wherein the first MOS tube and the second MOS tube are respectively electrically connected with the first direct current output end;

the second electrode circuit comprises a second direct current output end, and a third MOS tube and a fourth MOS tube which are respectively electrically connected with the second direct current output end, wherein the third MOS tube is electrically connected with the positive electrode output end, and the fourth MOS tube is electrically connected with the negative electrode output end;

the first MOS tube and the fourth MOS tube are respectively and electrically connected with the pin OUTB, and the second MOS tube and the third MOS tube are respectively and electrically connected with the pin OUTA;

when the pin OUTB outputs a high level and the pin OUTA outputs a low level, the first MOS tube and the fourth MOS tube are respectively conducted, the second MOS tube and the third MOS tube are respectively in a broken circuit state, the first direct current output end outputs a positive pole, and the second direct current output end outputs a negative pole;

when the pin OUTB outputs a low level and the pin OUTA outputs a high level, the first MOS transistor and the fourth MOS transistor are in an open circuit state, the second MOS transistor and the third MOS transistor are turned on, the first dc output terminal outputs a negative electrode, and the second dc output terminal outputs a positive electrode.

7. The bridge-unit-based bi-color LED driving circuit according to claim 6, wherein the first electrode circuit and the second electrode circuit are further electrically connected to an over-current protection pin OCP-IN of the PWM converter, respectively, for implementing an over-current protection function of the electrode switching module.

8. The bridge unit-based bi-color LED driving circuit of claim 6, wherein the PWM control module comprises a PWM chip, a first photo coupler and a second photo coupler,

and a pin 3 and a pin 4 of the PWM chip alternately output PWM signals at a high level and a low level, respectively, and the pin 3 and the pin 4 of the PWM chip are electrically connected to a pin INB and a pin INA of the PWM converter through the first photoelectric coupler and the second photoelectric coupler, respectively.

9. The bridge-unit-based bi-color LED driving circuit according to claim 8, wherein a pin 6 of the PWM chip of the PWM control module is electrically connected to the adjustable constant current power supply, and the pin 6 outputs a PWM signal to control the adjustable constant current power supply to adjust the current magnitude to control the dimming of the LED.

10. An LED lighting device, characterized in that it employs a bridge unit based bi-color LED driving circuit according to any one of claims 1-9.