CN209627764U - A kind of constant-voltage LED circuit - Google Patents
A kind of constant-voltage LED circuit Download PDFInfo
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- CN209627764U CN209627764U CN201822266586.2U CN201822266586U CN209627764U CN 209627764 U CN209627764 U CN 209627764U CN 201822266586 U CN201822266586 U CN 201822266586U CN 209627764 U CN209627764 U CN 209627764U
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Abstract
The utility model relates to a kind of constant-voltage LED circuits, and LED lamp panel, multichannel current sampling circuit and multichannel isolation feedback circuit including constant pressure conversion circuit, the LED branch being connected in parallel to each other equipped with multichannel, every LED branch includes multiple LED lamp beads in sequential series；Voltage output end is electrically connected with one end of all LED branches, one end of LED branch is electrically connected with the Voltage Feedback input terminal of constant pressure conversion circuit, the other end of LED branch is electrically connected with corresponding current sampling circuit, current sampling circuit is electrically connected with corresponding isolation feedback circuit, and all isolation feedback circuits are electrically connected with the current feedback input terminal of constant pressure conversion circuit.The utility model is on the basis of guaranteeing that each paths of LEDs branch is independent of one another, the Current compliance of all LED branches is also ensured simultaneously, simultaneously by the Voltage Feedback of LED branch in parallel to constant pressure conversion circuit, when a paths of LEDs branch breaks down wherein, remaining LED branch can also work normally, and substantially prolong the service life of entire LED circuit.
Description
Technical field
The utility model relates to LED circuit technical field more particularly to a kind of constant-voltage LED circuits.
Background technique
Existing LED circuit is the direct current output electricity that alternating current 220V is converted into 30-36V by constant current AC/DC converter
Pressure；This output voltage is resupplied into lamp plate, lamp plate is equipped with multiple groups LED light, and every group of LED light is concatenated by multiple lamp beads to be formed,
Finally by sample resistance R to be formed into a loop, the electric current on resistance R be LED lamp panel export total current, the voltage generated herein
Constant current AC/DC converter is given as current feedback signal, the multiple groups LED light electric current controlled on lamp plate is constant.But it is this
LED circuit after a period of time that works, if any etc. lamp beads damage, which group LED light where the lamp bead of the damage can not be just
Often work, since constant current AC/DC converter provides constant current, to guarantee that output electric current is constant, what remaining was worked normally
Electric current in LED light group just will increase, result be exactly remaining work normally LED light group can approximant damage, until whole
It does not work.Therefore, in this LED circuit, as long as a certain lamp bead damage, entire LED circuit all can not work normally soon,
Service life is short, high failure rate.
Summary of the invention
Technical problem to be solved in the utility model is in view of the above shortcomings of the prior art, to provide a kind of constant-voltage LED
Circuit.
The technical solution that the utility model solves above-mentioned technical problem is as follows: a kind of constant-voltage LED circuit, including constant pressure conversion
Circuit, the LED lamp panel of the LED branch being connected in parallel to each other equipped with multichannel and identical and one-to-one as the LED number of branches
Current sampling circuit, isolation feedback circuit identical and one-to-one with the current sampling circuit quantity, every LED branch
Road includes multiple LED lamp beads in sequential series；
The voltage input end of the constant pressure conversion circuit is electrically connected with external alternating current, voltage output end and all LED
One end of branch is electrically connected, and one end of the LED branch is electrically connected with the Voltage Feedback input terminal of the constant pressure conversion circuit, institute
The other end of LED branch is stated to be electrically connected with the corresponding current sampling circuit, the current sampling circuit with it is corresponding described
Isolation feedback circuit electrical connection, all isolation feedback circuits are electric with the current feedback input terminal of the constant pressure conversion circuit
Connection.
The beneficial effects of the utility model are: the constant-voltage LED circuit of the utility model, by sample circuit to each
LED branch carries out current sample, and will be after often current feedback information all the way be isolated and after connecing by isolation feedback circuit
Constant pressure conversion circuit is fed back to, in this way on the basis of guaranteeing that each paths of LEDs branch is independent of one another, while being also ensured all
The Current compliance of LED branch, while by the Voltage Feedback of LED branch in parallel to constant pressure conversion circuit, wherein a paths of LEDs
When branch breaks down, remaining LED branch can also be worked normally, and substantially prolong the service life of entire LED circuit.
Based on the above technical solution, the utility model can also do following improvement:
Further, the constant pressure conversion circuit uses the converter chip of UC38 series.
Further, the current sampling circuit includes sample resistance, one end of the sample resistance and the corresponding LED
The other end of branch is electrically connected, other end ground connection, and one end of the sample resistance is as output end and constant pressure conversion electricity
The Voltage Feedback input terminal on road is electrically connected.
The beneficial effect of above-mentioned further scheme is: can be to the corresponding LED branch by the sample resistance
Electric current is sampled, and feeds back to the constant pressure conversion circuit via the isolation feedback circuit.
Further, the isolation feedback circuit includes feedback isolation diode, and the anode of the feedback isolation diode
It is electrically connected with the output end of the current sampling circuit, the cathode of the feedback isolation diode and the constant pressure conversion circuit
The electrical connection of current feedback input terminal.
The beneficial effect of above-mentioned further scheme is: can will be per the LED described all the way by the feedback isolation diode
The sampling current of branch is isolated, and is guaranteed the independence between each paths of LEDs branch, is avoided interfering with each other.
Further, the constant-voltage LED circuit further includes filter circuit, the filter circuit is connected electrically in the constant pressure and turns
It changes between the voltage output end of circuit and one end of the LED branch.
The beneficial effect of above-mentioned further scheme is: can be exported to the constant pressure conversion circuit by the filter circuit
Voltage signal be filtered, remove clutter, improve the stability of LED light group work, while being also convenient for constant pressure conversion circuit root
Feedback control is carried out according to filtered voltage signal.
Further, the filter circuit includes filter capacitor, one end of the filter capacitor is converted with the constant pressure respectively
One end electrical connection of the voltage output end and LED branch of circuit, the other end ground connection of the filter capacitor.
Detailed description of the invention
Fig. 1 is the constant-voltage LED electrical block diagram of the utility model.
Specific embodiment
The principles of the present invention and feature are described below in conjunction with attached drawing, example is served only for explaining that this is practical
It is novel, it is not intended to limit the scope of the utility model.
As shown in Figure 1, a kind of constant-voltage LED circuit, including constant pressure conversion circuit, the LED branch being connected in parallel to each other equipped with multichannel
LED lamp panel and current sampling circuit identical and one-to-one with the LED number of branches, with the current sampling circuit
Quantity is identical and one-to-one isolation feedback circuit, and every LED branch includes multiple LED lamp beads in sequential series；
The voltage input end of the constant pressure conversion circuit is electrically connected with external alternating current, voltage output end and all LED
One end of branch is electrically connected, and one end of the LED branch is electrically connected with the Voltage Feedback input terminal of the constant pressure conversion circuit, institute
The other end of LED branch is stated to be electrically connected with the corresponding current sampling circuit, the current sampling circuit with it is corresponding described
Isolation feedback circuit electrical connection, all isolation feedback circuits are electric with the current feedback input terminal of the constant pressure conversion circuit
Connection.
The constant-voltage LED circuit of the utility model carries out current sample to each LED branch by sample circuit, and leads to
Constant pressure conversion circuit is fed back to after crossing isolation feedback circuit and being isolated per current feedback information all the way and after connecing, is existed in this way
It on the basis of guaranteeing that each paths of LEDs branch is independent of one another, while also ensuring the Current compliance of all LED branches, simultaneously will
The Voltage Feedback of LED branch in parallel is to constant pressure conversion circuit, when a paths of LEDs branch breaks down wherein, remaining LED branch
Also it can work normally, substantially prolong the service life of entire LED circuit.
In the embodiments of the present invention, lamp plate is made of multiple groups LED light group with heat sink, and heat sink uses aluminium base
Plate, heat dissipation effect are preferable.
In the embodiments of the present invention, the lamp bead specification are as follows: power 1W, voltage rating: 3-3.3V, rated current:
300-350Ma, each paths of LEDs branch can connect 10-20 lamp bead Di (i ∈ (10-20)), with 10 LED lamp bead shapes in Fig. 1
For one group.The voltage at every group of LED light group both ends is 33V, electric current 300mA, for example, when the quantity of LED light group is two groups
When, total current 600mA.
In the embodiments of the present invention, the constant pressure conversion circuit uses the converter chip U1 of UC38 series.Pass through
Alternating current 220V input voltage is converted into the DC output voltage of 30-34V by constant pressure conversion chip U1, and is powered to lamp plate.Transformation
1 foot of device chip accesses power frequency 220V AC voltage, and 2 feet are direct current outputs, connect the anode of LED branch, and 3 feet are that Voltage Feedback is defeated
Enter end, 4 feet are current feedback input terminals.
In the embodiments of the present invention, the other end of one end of the sample resistance Ri and the corresponding LED branch
Electrical connection, other end ground connection, and one end of the sample resistance Ri is anti-as the voltage of output end and the constant pressure conversion circuit
Present input terminal electrical connection.The electric current of the corresponding LED branch can be sampled by the sample resistance Ri, and via
The isolation feedback circuit feeds back to the constant pressure conversion circuit.
In the embodiments of the present invention, the isolation feedback circuit includes feedback isolation diode Di, and the feedback
The anode of isolating diode Di is electrically connected with the output end of the current sampling circuit, the cathode of the feedback isolation diode Di
It is electrically connected with the current feedback input terminal of the constant pressure conversion circuit.It can will be per all the way by the feedback isolation diode Di
The sampling current of the LED branch is isolated, and is guaranteed the independence between each paths of LEDs branch, is avoided interfering with each other.
Preferably, in the embodiments of the present invention, the constant-voltage LED circuit further includes filter circuit, the filtering
Circuit is connected electrically between the voltage output end of the constant pressure conversion circuit and one end of the LED branch.Pass through the filtering
The voltage signal that circuit can export the constant pressure conversion circuit is filtered, and removes clutter, improves the steady of LED light group work
It is qualitative, while being also convenient for constant pressure conversion circuit and feedback control is carried out according to filtered voltage signal.
Preferably, in the embodiments of the present invention, the filter circuit includes filter capacitor C1, the filter capacitor C1
One end be electrically connected respectively with one end of the voltage output end of the constant pressure conversion circuit and LED branch, the filter capacitor C1
The other end ground connection.
The LED drive circuit of the utility model, it is creative by sample by string every group of LED light group on lamp plate, it takes
The road Yang Houjiangmei current feedback signal pass through diode-isolated after and it is reversed be fed to constant pressure conversion circuit, guarantee the only of every road in this way
Vertical property, while also guaranteeing the consistency of the electric current of all LED light groups.It is finally driven with constant pressure converter, as constant pressure converter
Switching Power Supply be common Switching Power Supply, cheap, wide in variety, the supply of material is stablized, and feedback system is advanced, and any string has lamp
Pearl damage, the variation of another cluster of lamps, ornamental pearl electric current will not be caused, lamp continues to use, will not subscription rate, extend the service life of lamp, even lamp
Complete bad, circuit works in pressure constant state, and voltage does not also increase, output capacitance safety.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (6)
1. a kind of constant-voltage LED circuit, it is characterised in that: the LED branch being connected in parallel to each other including constant pressure conversion circuit, equipped with multichannel
LED lamp panel and current sampling circuit identical and one-to-one with the LED number of branches, with the current sampling circuit number
Identical and one-to-one isolation feedback circuit is measured, every LED branch includes multiple LED lamp beads in sequential series；
The voltage input end of the constant pressure conversion circuit is electrically connected with external alternating current, voltage output end and all LED branches
One end electrical connection, one end of the LED branch is electrically connected with the Voltage Feedback input terminal of the constant pressure conversion circuit, described
The other end of LED branch is electrically connected with the corresponding current sampling circuit, the current sampling circuit with it is corresponding it is described every
It is electrically connected from feed circuit, current feedback input terminal of all isolation feedback circuits with the constant pressure conversion circuit is electrically connected
It connects.
2. constant-voltage LED circuit according to claim 1, it is characterised in that: the constant pressure conversion circuit is using UC38 series
Converter chip.
3. constant-voltage LED circuit according to claim 1, it is characterised in that: the current sampling circuit includes sample resistance,
One end of the sample resistance is electrically connected with the other end of the corresponding LED branch, other end ground connection, and the sample resistance
One end be electrically connected as output end with the Voltage Feedback input terminal of the constant pressure conversion circuit.
4. constant-voltage LED circuit according to claim 1, it is characterised in that: the isolation feedback circuit includes feedback isolation
Diode, and the feedback isolation diode anode be electrically connected with the output end of the current sampling circuit, it is described feed back every
It is electrically connected from the cathode of diode with the current feedback input terminal of the constant pressure conversion circuit.
5. constant-voltage LED circuit according to claim 1-4, it is characterised in that: it further include filter circuit, the filter
Wave circuit is connected electrically between the voltage output end of the constant pressure conversion circuit and one end of the LED branch.
6. constant-voltage LED circuit according to claim 5, it is characterised in that: the filter circuit includes filter capacitor, described
One end of filter capacitor is electrically connected with one end of the voltage output end of the constant pressure conversion circuit and LED branch respectively, the filter
The other end of wave capacitor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822266586.2U CN209627764U (en) | 2018-12-29 | 2018-12-29 | A kind of constant-voltage LED circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822266586.2U CN209627764U (en) | 2018-12-29 | 2018-12-29 | A kind of constant-voltage LED circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209627764U true CN209627764U (en) | 2019-11-12 |
Family
ID=68448231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822266586.2U Active CN209627764U (en) | 2018-12-29 | 2018-12-29 | A kind of constant-voltage LED circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209627764U (en) |
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2018
- 2018-12-29 CN CN201822266586.2U patent/CN209627764U/en active Active
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