CN208353668U - One kind imitating linear LED drive circuit - Google Patents
One kind imitating linear LED drive circuit Download PDFInfo
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- CN208353668U CN208353668U CN201821028180.4U CN201821028180U CN208353668U CN 208353668 U CN208353668 U CN 208353668U CN 201821028180 U CN201821028180 U CN 201821028180U CN 208353668 U CN208353668 U CN 208353668U
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Abstract
The utility model discloses one kind to imitate linear LED drive circuit, including at least one driving unit, driving unit includes the luminescence unit at least containing a light emitting diode, driving unit further include: the first metal-oxide-semiconductor, the drain electrode of the first metal-oxide-semiconductor and the output end of luminescence unit connect；Clamped resistance, clamped resistance one end are connected to the source electrode of the first metal-oxide-semiconductor, and the other end is connected to electric current outflow end；First control voltage, the first control voltage access the grid of the first metal-oxide-semiconductor, and the first control voltage is greater than the cut-in voltage of the first metal-oxide-semiconductor, so that the first metal-oxide-semiconductor is connected.It is disclosed by the utility model to prevent linear LED drive circuit, in the conducting section of luminescence unit, the sensibility of current vs voltage reduces, i.e. when the electric current on luminescence unit increases, clamp resistance on the source electrode of first metal-oxide-semiconductor has been lifted the source potential of the first metal-oxide-semiconductor, the conducting electric current for inhibiting luminescence unit both ends, has clamped down on circuital current.
Description
Technical field
The utility model relates to electronic circuits, specifically, being related to one kind imitates linear LED drive circuit.
Background technique
LED light source is used widely with its high efficiency in lighting area.However the IV nonlinear characteristic of LED luminescence chip
Its application is greatly limited, so that LED chip can not be used as pervasive arbitrary source, and is needed and driving circuit knot
It closes, Mr. Yu's class particular power source can be applicable in.It is mainly manifested in such as Fig. 1, the IV curve of LED can be seen that LED at low voltage
Electric current very little, LED is close to off state；And in the threshold voltage V for reaching LED conducting0Electric current increases sharply afterwards, just right at this time
Driving power proposes higher requirement, which needs to have large range of operating current section.In order to solve this
A problem, LED chip manufacturer propose the concept of light engine, and LED chip and peripheral drive circuit are integrated into a mould
Group is used as raw material supply LED lamp manufacturer.However there is also limitations for light engine product itself.It is mainly reflected in universality
Difference, cost and integrated level do not optimize etc..
Utility model content
The purpose of this utility model is to provide one kind to imitate linear LED drive circuit, it is intended to it is external to solve traditional LED lamp pearl
The more demanding technical problem for the driving power enclosed.
One kind provided by the utility model imitates linear LED drive circuit, including at least one driving unit, and the driving is single
Member includes the luminescence unit at least containing a light emitting diode, driving unit further include:
First metal-oxide-semiconductor, the drain electrode of first metal-oxide-semiconductor and the output end of luminescence unit connect；
Clamped resistance, described clamped resistance one end are connected to the source electrode of first metal-oxide-semiconductor, and the other end is connected to electric current stream
Outlet；
First control voltage, the first control voltage access the grid of first metal-oxide-semiconductor, and the control voltage is greater than
The cut-in voltage of the metal-oxide-semiconductor, so that first metal-oxide-semiconductor is connected.
Wherein, the driving unit further includes a water conservancy diversion branch, and the water conservancy diversion branch includes:
The second metal-oxide-semiconductor being connected between the luminescence unit input terminal and the first metal-oxide-semiconductor source electrode, described second
The second control of access voltage on the grid of metal-oxide-semiconductor, the second control voltage control second metal-oxide-semiconductor is in the conductive state,
And the cut-in voltage of second metal-oxide-semiconductor is less than the conducting voltage of the luminescence unit.
Further, access has driving voltage on the input terminal of the luminescence unit.
Further, the driving unit has multiple, and respectively the 1st driving unit, the 2nd driving unit to N drive
Unit, the 1st driving unit, the 2nd driving unit to N driving unit are sequentially connected in series, and the electric current outflow end of a driving unit connects
It is connected to the luminescence unit input terminal of another driving unit；The driving voltage accesses the luminescence unit of the 1st driving unit
The electric current outflow end of input terminal, N driving unit is connected to ground terminal.
Further, the driving unit at least has 5.
Further, the luminescence unit is multiple light emitting diode series arms.
Further, first metal-oxide-semiconductor and second metal-oxide-semiconductor are that N-channel is enhanced.
It is disclosed by the utility model to prevent linear LED drive circuit, in the conducting section of luminescence unit, current vs voltage
Sensibility reduces, i.e., when the electric current on luminescence unit increases, the clamp resistance on the source electrode of the first metal-oxide-semiconductor has been lifted first
The source potential of metal-oxide-semiconductor is compared to for the circuit for being not connected to the first metal-oxide-semiconductor and clamp resistance, on luminescence unit both ends
Voltage reduces, it is suppressed that the conducting electric current at luminescence unit both ends has clamped down on circuital current.At this point, the electric current on luminescence unit
With the increased trend of voltage to slowing down, the requirement to driving power is reduced.
Detailed description of the invention
Fig. 1 is the I-V curve of light emitting diode.
Fig. 2 is a kind of driving unit circuit diagram in the utility model；
Fig. 3 is the I-V curve of embodiment illustrated in fig. 2；
Fig. 4 is that there are the utility model multiple driving units to imitate linear LED drive circuit schematic diagram；
Fig. 5 is the circuit diagram of another driving unit in the utility model；
Fig. 6 is the I-V curve of embodiment illustrated in fig. 5；
Fig. 7 is the imitative linear LED drive circuit schematic diagram that the utility model has multiple driving units.
Specific embodiment
The utility model is further elaborated and is illustrated with Figure of description combined with specific embodiments below:
Referring to FIG. 2, the utility model, which provides one kind, imitates linear LED drive circuit, which includes driving
Unit A, the first metal-oxide-semiconductor Q1 and clamp resistance.Wherein driving unit A is a light emitting diode, the drain electrode of the first metal-oxide-semiconductor Q1
It is connected to the output end of light emitting diode, the source electrode of the first metal-oxide-semiconductor Q1 is connected to clamp resistance, the other end connection of clamp resistance
To electric current outflow end.Access has the first control voltage Vg1 on the grid of first metal-oxide-semiconductor Q1, and first control voltage Vg1 is greater than
The cut-in voltage of first metal-oxide-semiconductor Q1, first metal-oxide-semiconductor Q1 are constantly on state.
In the embodiments of the present invention, it is connected with driving voltage Vs on the input terminal of luminescence unit LED1, works as drive
When dynamic voltage Vs is greater than the conducting voltage of luminescence unit LED1, luminescence unit LED1 conducting, and issue light.Metal-oxide-semiconductor is voltage pair
The control device of electric current, the first metal-oxide-semiconductor Q1 export corresponding electric current, the output electric current and conducting according to the first control voltage Vg1
The size of current on light emitting diode afterwards is identical.
Such as Fig. 3, when luminescence unit LED1 and the first metal-oxide-semiconductor Q1 are on state, on luminescence unit LED1
Electric current can't change with the increase of driving voltage Vs, and the electric current on luminescence unit LED1 is leaked with the first metal-oxide-semiconductor Q1 always
Electric current on extremely is identical, to overcome as shown in figure 1, after luminescence unit LED1 conducting, electric current is jumpy with voltage thereon
Situation, the requirement to driving voltage Vs at this time is just corresponding to be reduced, in this way it is no longer necessary to large range of driving current.
In the other embodiments of the utility model, luminescence unit LED1 can also be concatenated multiple light-emitting diodes
Pipe.
Such as Fig. 4, in another embodiment of the utility model, driving unit A has multiple, and the respectively the 1st driving is single
First A, the 2nd driving unit A to N driving unit A, the 1st driving unit A, the 2nd driving unit A to N driving unit A successively go here and there
Connection, the electric current outflow end of a driving unit A are connected to the luminescence unit LED1 input terminal of another driving unit A；The drive
Dynamic voltage Vs accesses the luminescence unit LED1 input terminal of the 1st driving unit A, the electric current outflow end connection of N driving unit A
To ground terminal, driving unit A should not be less than 5 in the preferred embodiment of the utility model.
In the present embodiment, multiple driving unit A are sequentially turned on, and the luminescence unit LED1 in multiple driving unit A is same
When be connected.
Such as Fig. 5, further, in the present invention, driving unit A further includes a water conservancy diversion branch, the water conservancy diversion branch
Road includes the second metal-oxide-semiconductor Q2 being connected between the luminescence unit LED1 input terminal and the first metal-oxide-semiconductor Q1 source electrode, described
The second control of access voltage on the grid of second metal-oxide-semiconductor Q2, the second control voltage control the second metal-oxide-semiconductor Q2, which is in, to be led
Logical state, and the cut-in voltage of the second metal-oxide-semiconductor Q2 is less than the conducting voltage of the luminescence unit LED1.
In the present embodiment, when the voltage value of driving voltage Vs changes since 0, but not up to luminescence unit LED1
When conducting voltage, the electric current that driving voltage Vs is generated flow to electric current outflow end through water conservancy diversion branch, and only has on luminescence unit LED1
There is voltage difference, the electric current of luminescence unit LED1 is 0.By increase water conservancy diversion branch ensure that driving unit A at low voltage according to
So there is electric current to flow through, the driving voltage Vs in the imitative linear LED drive circuit of the utility model can be made to can be applied to larger
Voltage range.
Such as Fig. 6, after increasing water conservancy diversion branch, the I-V curve of the first metal-oxide-semiconductor Q1 and the conducting voltage on the second metal-oxide-semiconductor Q2,
As can be seen that curve is stepped from curve, rather than the curve steeply risen in Fig. 1, it advantageously reduces to driving electricity
Press the requirement of Vs.
Such as Fig. 7, Fig. 7 is that multiple driving unit A with water conservancy diversion branch connect the imitative linear LED drive circuit signal to be formed
Figure.In the circuit, when driving voltage Vs is not enough to be connected all luminescence unit LED1, the low current of driving voltage Vs generation
Respectively by the water conservancy diversion branch outflow in each driving unit A, the circulation of entire driving circuit ensure that.When on driving voltage Vs
It is raised to when all luminescence unit LED1 can be made to be connected, electric current flows through first metal-oxide-semiconductor Q1, Q3 of each driving unit A, Yi Jifa
Light unit LED1 ensure that all luminescence unit LED1 are simultaneously turned on.
In the present invention, the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 is that N-channel is enhanced.
Finally it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than to this reality
With the limitation of novel protected range, although being explained in detail referring to preferred embodiment to the utility model, this field it is general
Lead to it will be appreciated by the skilled person that can be with the technical solution of the present invention is modified or equivalently replaced, without departing from this
The spirit and scope of utility model technical solution.
Claims (7)
1. one kind imitates linear LED drive circuit, including at least one driving unit, driving unit includes at least shining containing one
The luminescence unit of diode, which is characterized in that driving unit further include:
First metal-oxide-semiconductor, the drain electrode of first metal-oxide-semiconductor and the output end of luminescence unit connect；
Clamped resistance, described clamped resistance one end are connected to the source electrode of first metal-oxide-semiconductor, and the other end is connected to electric current outflow
End；
First control voltage, the first control voltage access the grid of first metal-oxide-semiconductor, and the first control voltage is greater than
The cut-in voltage of first metal-oxide-semiconductor, so that first metal-oxide-semiconductor is connected.
2. imitating linear LED drive circuit as described in claim 1, which is characterized in that the driving unit, which further includes one, leads
Branch is flowed, the water conservancy diversion branch includes:
The second metal-oxide-semiconductor being connected between the luminescence unit input terminal and the first metal-oxide-semiconductor source electrode, second metal-oxide-semiconductor
Grid on access the second control voltage, it is in the conductive state and described that the second control voltage controls second metal-oxide-semiconductor
The cut-in voltage of second metal-oxide-semiconductor is less than the conducting voltage of the luminescence unit.
3. imitating linear LED drive circuit as claimed in claim 1 or 2, which is characterized in that on the input terminal of the luminescence unit
Access has driving voltage.
4. imitating linear LED drive circuit as claimed in claim 3, which is characterized in that the driving unit has multiple, difference
For the 1st driving unit, the 2nd driving unit to N driving unit, the 1st driving unit, the 2nd driving unit to N driving unit according to
The electric current outflow end of secondary series connection, a driving unit is connected to the luminescence unit input terminal of another driving unit；The driving
Voltage accesses the luminescence unit input terminal of the 1st driving unit, and the electric current outflow end of N driving unit is connected to ground terminal.
5. imitating linear LED drive circuit as claimed in claim 4, which is characterized in that the driving unit at least has 5.
6. imitating linear LED drive circuit as claimed in claim 4, which is characterized in that the luminescence unit is multiple luminous two
Pole pipe series arm.
7. imitating linear LED drive circuit as claimed in claim 2, which is characterized in that first metal-oxide-semiconductor and described second
Metal-oxide-semiconductor is that N-channel is enhanced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821028180.4U CN208353668U (en) | 2018-06-30 | 2018-06-30 | One kind imitating linear LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821028180.4U CN208353668U (en) | 2018-06-30 | 2018-06-30 | One kind imitating linear LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208353668U true CN208353668U (en) | 2019-01-08 |
Family
ID=64882399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821028180.4U Active CN208353668U (en) | 2018-06-30 | 2018-06-30 | One kind imitating linear LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208353668U (en) |
-
2018
- 2018-06-30 CN CN201821028180.4U patent/CN208353668U/en active Active
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