CN208523031U - The driving circuit of light emitting diode - Google Patents
The driving circuit of light emitting diode Download PDFInfo
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- CN208523031U CN208523031U CN201821252641.6U CN201821252641U CN208523031U CN 208523031 U CN208523031 U CN 208523031U CN 201821252641 U CN201821252641 U CN 201821252641U CN 208523031 U CN208523031 U CN 208523031U
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Abstract
The utility model proposes a kind of driving circuit of light emitting diode, which includes: light emitting diode module；Constant flow module, the input terminal of constant flow module and the cathode of light emitting diode module connect, the output end ground connection of constant flow module, for limiting the peak value for flowing through the electric current of light emitting diode module；Constant pressure module, the first output end of constant pressure module and the anode of light emitting diode module connect, and the second output terminal of constant pressure module and the input terminal of constant flow module connect, for exporting the input terminal of constant voltage to constant flow module.The driving circuit of the light emitting diode of the utility model can protect LED over-current phenomenon avoidance do not occur；And can guarantee that the voltage of constant flow module is constant, it avoids reducing because of LED lamp bead output voltage, the increase of the heating loss of caused constant flow module, and when LED lamp bead output voltage rises, it is ensured that constant flow module can normal constant-current.
Description
Technical field
The utility model relates to lamps and lanterns control technology field more particularly to a kind of driving circuits of light emitting diode.
Background technique
The driving circuit of light emitting diode (Light Emitting Diode, abbreviation LED) generally comprise constant flow module with
Constant pressure mould is fast.
In the related technology, driving circuit generates constant voltage by constant pressure mould fastly, and constant voltage is input to LED and perseverance
Make LED operation in flow module.But when input voltage is constant, output voltage cannot be adjusted accordingly, the voltage of constant flow module
It can change because of the change of LED lamp bead voltage, when the decline of LED lamp bead output voltage, the voltage that LED lamp bead is declined all is applied
It is added on constant flow module, so that the heating loss of constant flow module increases；Electricity when LED lamp bead voltage rises, on constant flow module
Pressure can be reduced accordingly, so that constant flow module is unable to normal constant-current.Meanwhile the output electric current of constant flow module is unstable, when output electricity
When stream is greater than LED rated operational current, it will lead to LED and over-current phenomenon avoidance occur.
Utility model content
The utility model is intended to solve at least some of the technical problems in related technologies.
For this purpose, a purpose of the utility model is to propose a kind of driving circuit of light emitting diode, in input voltage
When constant, it is ensured that constant flow module voltage it is constant, avoid because LED lamp bead output voltage reduce, the hair of caused constant flow module
The increase of thermal losses, and when LED lamp bead output voltage rises, it is ensured that constant flow module can normal constant-current.Meanwhile it can avoid
The over-current phenomenon avoidance of LED.
In order to achieve the above objectives, the utility model first aspect embodiment proposes a kind of driving electricity of light emitting diode
Road, comprising:
Light emitting diode module；
Constant flow module, the input terminal of the constant flow module are connect with the cathode of the light emitting diode module, the constant current
The output end of module is grounded, for limiting the peak value for flowing through the electric current of the light emitting diode module；
Constant pressure module, the first output end of the constant pressure module is connect with the anode of the light emitting diode module, described
The second output terminal of constant pressure module is connect with the input terminal of the constant flow module, for exporting constant voltage to the constant current mould
The input terminal of block.
According to the utility model embodiment propose light emitting diode driving circuit, the input terminal of constant flow module and shine
The cathode of diode modules connects, and the output end ground connection of constant flow module can limit the peak for flowing through the electric current of light emitting diode module
Value, and then LED can be protected over-current phenomenon avoidance do not occur；First output end of constant pressure module and the anode of light emitting diode module connect
Connect, the input terminal of the second output terminal of constant pressure module and constant flow module connects, exportable constant voltage to constant flow module it is defeated
Enter end, therefore, when input voltage is constant, it is ensured that the voltage of constant flow module is constant, avoids because of LED lamp bead output voltage drop
It is low, the increase of the heating loss of caused constant flow module, and when LED lamp bead output voltage rises, it is ensured that constant flow module can
Normal constant-current.
One embodiment according to the present utility model, the driving circuit further include: feedback module；The of the constant pressure module
Two output ends are connect by the feedback module with the input terminal of the constant flow module.
One embodiment according to the present utility model, the feedback module include: first resistor, and the of the first resistor
One end is connect with the second output terminal of the constant pressure module, the second end ground connection of the first resistor；Second resistance, described second
The first end of resistance is connect with the input terminal of the constant flow module, and the of the second end of the second resistance and the constant pressure module
The connection of two output ends.
One embodiment according to the present utility model, the driving circuit further include: 3rd resistor；The constant flow module it is defeated
Outlet is grounded by the 3rd resistor.
One embodiment according to the present utility model, the driving circuit further include: first capacitor, the of the first capacitor
One end is connect with the first output end of the constant pressure module, the second end ground connection of the first capacitor.
One embodiment according to the present utility model, the driving circuit further include: rectification module, the rectification module it is defeated
Outlet is connect with the input terminal of the constant pressure module, ac signal for receiving input, and the ac signal is turned
It is changed to the input terminal that DC signal is input to the constant pressure module.
Detailed description of the invention
Fig. 1 is the structural schematic diagram according to the driving circuit of the light emitting diode of the utility model one embodiment；
Fig. 2 is the circuit diagram according to the driving circuit of the light emitting diode of the utility model another embodiment.
Specific embodiment
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and should not be understood as to the utility model
Limitation.
With reference to the accompanying drawing come describe the utility model embodiment light emitting diode driving circuit.
Fig. 1 is the structural schematic diagram according to the driving circuit of the light emitting diode of the utility model one embodiment.Such as Fig. 1
Shown, the driving circuit of the light emitting diode of the utility model embodiment includes:
Light emitting diode module 11.
The input terminal of constant flow module 12, constant flow module 12 is connect with the cathode of light emitting diode module 11, constant flow module 12
Output end ground connection, for limiting the peak value for flowing through the electric current of light emitting diode module 11.
Constant pressure module 13, the first output end of constant pressure module 13 are connect with the anode of light emitting diode module 11, constant pressure mould
The second output terminal of block 13 is connect with the input terminal of constant flow module 12, for exporting the input of constant voltage to constant flow module 12
End.
Specifically, light emitting diode module 11 can specifically include multiple light emitting diodes being sequentially connected in series.Constant flow module
12 can control the peak value for flowing through the electric current of light emitting diode module 11 equal to preset constant current value, so as to protect LED
There is not over-current phenomenon avoidance.
Constant pressure module 13 exports the input terminal of constant voltage to constant flow module 12, the first output end of constant pressure module 13 and
Voltage, that is, output voltage between second output terminal, equal to the voltage+constant flow module both ends at 11 both ends of light emitting diode module
Voltage.When input voltage is constant, since the voltage at 12 both ends of constant flow module is constant, the output voltage of constant pressure module 13 with
Change with the variation of the voltage at 11 both ends of light emitting diode module, so that the output voltage for realizing constant pressure module 13 is adjustable
Section.Therefore, when input voltage is constant, it is ensured that the voltage of constant flow module 12 is constant, to avoid because of light emitting diode module
11 output voltages reduce, the increase of the heating loss of caused constant flow module 12, and in 11 output voltage of light emitting diode module
When rising, guarantee that constant flow module 12 can normal constant-current work.
According to the utility model embodiment propose light emitting diode driving circuit, the input terminal of constant flow module and shine
The cathode of diode modules connects, and the output end ground connection of constant flow module can limit the peak for flowing through the electric current of light emitting diode module
Value, and then LED can be protected over-current phenomenon avoidance do not occur；First output end of constant pressure module and the anode of light emitting diode module connect
Connect, the input terminal of the second output terminal of constant pressure module and constant flow module connects, exportable constant voltage to constant flow module it is defeated
Enter end, therefore, when input voltage is constant, it is ensured that the voltage of constant flow module is constant, can avoid because of LED lamp bead output voltage drop
It is low, the increase of the heating loss of caused constant flow module, and when LED lamp bead output voltage rises, it is ensured that constant flow module can
Normal constant-current.
Fig. 2 is according to the circuit diagram of the driving circuit of the light emitting diode of the utility model another embodiment, such as Fig. 2 institute
Show, driving circuit on the basis of embodiment shown in Fig. 1 further include: feedback module 21；The second output terminal of constant pressure module 13 is logical
Feedback module 21 is crossed, is connect with the input terminal of constant flow module 12.
Wherein, feedback module 21 includes: first resistor R1, and the second of the first end of first resistor R1 and constant pressure module 13 is defeated
Outlet connection, the second end ground connection of first resistor R1；The first end of second resistance R2, second resistance R2 are defeated with constant flow module 12
Enter end connection, the second end of second resistance R2 is connect with the second output terminal of constant pressure module 13.
In the utility model embodiment, the mode of first resistor R1, second resistance R2 partial pressure is can be used in feedback module 21, is obtained
Take drain-source pole (pole D-S) voltage of the Metal-Oxide Semiconductor transistor (metal-oxide-semiconductor) in constant flow module 12, and by the pole D-S
For Voltage Feedback to constant pressure module 13, the D-S that constant pressure module 13 according to the D-S pole tension of feedback, can control constant flow module 12 is extremely electric
Pressure remains constant, therefore, it is ensured that the voltage of constant flow module 12 is constant, avoids reducing because of LED lamp bead output voltage, cause
Constant flow module 12 heating loss increase, and LED lamp bead output voltage rise when, it is ensured that constant flow module 12 can be normal
Constant current.The total output voltage of constant pressure module 13 is consistently equal to the D-S pole tension V of the metal-oxide-semiconductor in constant flow module 12dsWith light emitting diode
The voltage V at 11 both ends of mould groupledThe sum of, i.e. the total output voltage=V of constant pressure module 13ds+Vled, therefore the output electricity of constant pressure module 13
Pressure can follow the variation of the voltage at 11 both ends of light emitting diode module and change.Therefore, when input voltage is constant, it can be achieved that defeated
Voltage is adjustable out, is held in constant pressure module 13 and light emitting diode module 11 under normal working condition, improves whole
A system stability.
Wherein, driving circuit on the basis of embodiment shown in Fig. 1 further include: 3rd resistor Rcs；Constant flow module 12 it is defeated
Outlet is grounded by 3rd resistor Rcs.
Wherein, driving circuit on the basis of embodiment shown in Fig. 1 further include: the of first capacitor C1, first capacitor C1
One end is connect with the first output end of constant pressure module 13, the second end ground connection of first capacitor C1.
In the utility model embodiment, first capacitor C1 can be by charge and discharge system to being input to light emitting diode module 11
Electric signal be filtered, reduce light emitting diode module 11 in LED ripple current, to guarantee LED without stroboscopic.
Wherein, driving circuit on the basis of embodiment shown in Fig. 1 further include: rectification module 22, the output of rectification module
End is connect with the input terminal of constant pressure module 13, ac signal for receiving input, and ac signal is converted to direct current
Electric signal is input to the input terminal of constant pressure module 13.
As a kind of feasible embodiment, rectification module 22 may include first diode D1, the second diode in Fig. 2
The rectifier bridge stack that D2, third diode D3, the 4th diode D4 are constituted.When AC signal (AC) is input to driving circuit, the
The rectifier bridge stack that one diode D1, the second diode D2, third diode D3, the 4th diode D4 are constituted can be by ac signal
Be converted to the input terminal that DC signal is input to constant pressure module 13.
According to the utility model embodiment propose light emitting diode driving circuit, the input terminal of constant flow module and shine
The cathode of diode modules connects, and the output end ground connection of constant flow module can limit the peak for flowing through the electric current of light emitting diode module
Value, and then LED can be protected over-current phenomenon avoidance do not occur；First output end of constant pressure module and the anode of light emitting diode module connect
Connect, the input terminal of the second output terminal of constant pressure module and constant flow module connects, exportable constant voltage to constant flow module it is defeated
Enter end, therefore, when input voltage is constant, it is ensured that the voltage of constant flow module is constant, avoids because of LED lamp bead output voltage drop
It is low, the increase of the heating loss of caused constant flow module, and when LED lamp bead output voltage rises, it is ensured that constant flow module can
Normal constant-current.First capacitor is filtered the electric signal for being input to light emitting diode module by charge and discharge system, can reduce
The ripple current of LED light source in light emitting diode module, to guarantee LED without stroboscopic.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
Identical embodiment or example need not be directed to by stating.Moreover, particular features, structures, materials, or characteristics described can be
It can be combined in any suitable manner in any one or more embodiment or examples.In addition, without conflicting with each other, this field
Technical staff can carry out the feature of different embodiments or examples described in this specification and different embodiments or examples
Combination and combination.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are in the scope of the utility model
Inside it can make changes, modifications, alterations, and variations to the above described embodiments.
Claims (6)
1. a kind of driving circuit of light emitting diode characterized by comprising
Light emitting diode module；
Constant flow module, the input terminal of the constant flow module are connect with the cathode of the light emitting diode module, the constant flow module
Output end ground connection, for limiting the peak value for flowing through the electric current of the light emitting diode module；
Constant pressure module, the first output end of the constant pressure module are connect with the anode of the light emitting diode module, the constant pressure
The second output terminal of module is connect with the input terminal of the constant flow module, for exporting constant voltage to the constant flow module
Input terminal.
2. driving circuit according to claim 1, which is characterized in that further include: feedback module；
The second output terminal of the constant pressure module is connect by the feedback module with the input terminal of the constant flow module.
3. driving circuit according to claim 2, which is characterized in that the feedback module includes:
First resistor, the first end of the first resistor are connect with the second output terminal of the constant pressure module, the first resistor
Second end ground connection；
Second resistance, the first end of the second resistance are connect with the input terminal of the constant flow module, and the of the second resistance
Two ends are connect with the second output terminal of the constant pressure module.
4. driving circuit according to claim 1, which is characterized in that further include: 3rd resistor；
The output end of the constant flow module is grounded by the 3rd resistor.
5. driving circuit according to claim 1, which is characterized in that further include:
First capacitor, the first end of the first capacitor are connect with the first output end of the constant pressure module, the first capacitor
Second end ground connection.
6. driving circuit according to claim 1, which is characterized in that further include:
Rectification module, the output end of the rectification module are connect with the input terminal of the constant pressure module, friendship for receiving input
Galvanic electricity signal, and the ac signal is converted into the input terminal that DC signal is input to the constant pressure module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821252641.6U CN208523031U (en) | 2018-08-03 | 2018-08-03 | The driving circuit of light emitting diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821252641.6U CN208523031U (en) | 2018-08-03 | 2018-08-03 | The driving circuit of light emitting diode |
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| Publication Number | Publication Date |
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| CN208523031U true CN208523031U (en) | 2019-02-19 |
Family
ID=65333254
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821252641.6U Active CN208523031U (en) | 2018-08-03 | 2018-08-03 | The driving circuit of light emitting diode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108712807A (en) * | 2018-08-03 | 2018-10-26 | 江西美的贵雅照明有限公司 | The driving circuit of light emitting diode |
-
2018
- 2018-08-03 CN CN201821252641.6U patent/CN208523031U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108712807A (en) * | 2018-08-03 | 2018-10-26 | 江西美的贵雅照明有限公司 | The driving circuit of light emitting diode |
| CN108712807B (en) * | 2018-08-03 | 2024-01-09 | 美智光电科技股份有限公司 | Driving circuit of light emitting diode |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200602 Address after: 335400 No. 1 Industrial Park, Yingtan, Jiangxi, Guixi Patentee after: MEIZHI PHOTOELECTRIC TECHNOLOGY Co.,Ltd. Address before: 335400 No. 1 Industrial Park, Yingtan, Jiangxi, Guixi Co-patentee before: MIDEA GROUP Co.,Ltd. Patentee before: MEIZHI PHOTOELECTRIC TECHNOLOGY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 335400 No. 1 Industrial Park, Yingtan, Jiangxi, Guixi Patentee after: Meizhi Optoelectronic Technology Co., Ltd Address before: 335400 No. 1 Industrial Park, Yingtan, Jiangxi, Guixi Patentee before: MEIZHI PHOTOELECTRIC TECHNOLOGY Co.,Ltd. |