CN104684198B - LED illumination circuit - Google Patents
LED illumination circuit Download PDFInfo
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- CN104684198B CN104684198B CN201310648746.9A CN201310648746A CN104684198B CN 104684198 B CN104684198 B CN 104684198B CN 201310648746 A CN201310648746 A CN 201310648746A CN 104684198 B CN104684198 B CN 104684198B
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- led
- voltage
- current
- led branch
- illumination circuit
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Abstract
The invention discloses a kind of LED illumination circuits.The LED illumination circuit includes LED branch, voltage generating unit, current generating unit and protection location; the LED branch includes at least a LED; the voltage generating unit is for generating an operating voltage; and the operating voltage is exported via the protection location to the LED branch; the current generating unit is for generating a driving current; to drive the LED branch; when the protection location is more than a pre-set current value for the driving current in the LED branch, the connection between the LED branch and the current generating unit is cut off.When the driving current of the LED branch is excessive, the technical effect that overcurrent protection is carried out to the LED branch is reached.
Description
Technical field
The present invention relates to electronic circuit technology fields, more particularly, to a kind of light emitting diode (light emitting
Diode, LED) lighting circuit.
Background technique
Currently, LED is since its service life is long, the advantages that switching speed is high and good reliability and be widely used.For example,
LED is typically used as indicator light, the backlight of display, exterior decoration etc..LED is a kind of current driven light-emitting element, due to kind
Kind reason, existing LED illumination circuit generally can not work under suitable operating current.If LED operation is inappropriate
Under operating current, then the luminescent properties of LED can be had some impact on, when LED operation electric current is excessive, can seriously be burnt out
LED, to cause the service life of LED illumination circuit shorter.
Summary of the invention
Therefore, it is necessary to provide a kind of longer LED illumination circuit of service life, and the LED illumination of easy burn-out LED is not allowed
Circuit.
A kind of LED illumination circuit, the LED illumination circuit include LED branch, voltage generating unit, current generating unit
And protection location.The LED branch includes at least a LED, and the voltage generating unit is used to generate an operating voltage, and will
The operating voltage is exported via the protection location to the LED branch, and the current generating unit is for generating a driving
Electric current, to drive the LED branch, the protection location is more than a default electricity for the driving current in the LED branch
When flow valuve, the connection between the LED branch and the current generating unit is cut off.
Preferably, the current generating unit includes a voltage receiving end, electric current generation chip and a current output terminal, institute
It states voltage receiving end and generates chip for receiving the operating voltage, the electric current and be used for according to operating voltage generation
Driving current, and the driving current is exported via the current output terminal.
Preferably, the LED illumination circuit further includes one first divider resistance, and first divider resistance connects one end company
The voltage receiving end is connect, the other end connects the LED branch to the current output terminal, and first divider resistance is for dropping
The voltage of the low current output terminal.
Preferably, the protection location is also used in the operating voltage that the voltage generating unit generates be more than one pre-
If when voltage value, cutting off the connection of the voltage generating unit Yu the LED branch.
Preferably, the protection location further includes that a switch unit, transient voltage inhibit diode, one-way commutation controllable
Silicon, the second divider resistance and third divider resistance, the switch unit include first end, second end and control terminal, the control
End disconnects and is closed by controlling the first end and the second end to control the switch unit cut-off and conducting, and described the
One end receives the operating voltage, and the second end connects the cathode of the transient voltage suppressor diode, the transient voltage
The anode of diode is inhibited to connect the silicon-controlled cathode of the one-way commutation, the silicon-controlled anode of the one-way commutation passes through described
Second divider resistance connects the control terminal of the switch unit, and the third divider resistance is connected to the first end and the control
Between end processed, when the operating voltage is more than the preset voltage value, the transient voltage suppressor diode and described unidirectional
Rectification thyristor conducting, the control terminal controls the first end and the second end disconnects, the switch unit cut-off.
Preferably, the protection circuit includes a current-limiting resistance and the 4th resistance, described in the connection of described current-limiting resistance one end
The other end of LED branch, the current-limiting resistance connects the silicon-controlled control pin of the one-way commutation by the 4th resistance,
When the driving current is greater than the pre-set current value, the one-way commutation one-way commutation controlled silicon conducting, the control terminal
It controls the first end and the second end disconnects, the switch unit cut-off.
Preferably, the switch unit is N-channel metal oxide semiconductor transistor, and the control terminal is the N ditch
The grid of road metal oxide semiconductor transistor, the first end and the second end are respectively the N-channel metal oxidation
The drain electrode of object semiconductor transistor and source electrode.
Preferably, the protection location further includes an overheating protection unit, is more than one for the heat when the LED branch
When preset temperature, the LED branch is cut off.
Preferably, the overheating protection unit includes thermistor.
Preferably, the thermistor is posive temperature coefficient thermistor.
Intersect with the prior art, LED illumination circuit of the present invention, it is described since the LED illumination circuit includes protection location
Protection location is used for when the driving current that the current generating unit generates is more than a pre-set current value, described in cutting
Connection between LED branch and the current generating unit.It is right when driving current to reach the LED branch is excessive
The LED branch carries out the technical effect of overcurrent protection.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the electrical block diagram of one better embodiment of LED illumination circuit of the present invention.
Fig. 2 is the electrical block diagram of protection location shown in FIG. 1.
Main element symbol description
LED illumination circuit 100
Voltage generating unit 110
Protection location 120
Current generating unit 130
LED branch 140
Voltage output end 111
First filter capacitor C0
First connecting pin 120a
Second connection end 120b
Second filter capacitor C1
First capacitor C2
Second capacitor C3
Third capacitor C4
Voltage-stabiliser tube ZD1
First divider resistance R1
Voltage receiving end 130a
Electric current generates chip 131
Current output terminal 130b
First resistor R2
Second resistance R3
Switch K
Reference resistance R4
Switch unit Q1
Zener diode D1
Transient voltage suppressor diode D2
One-way commutation controllable silicon SCR
Second divider resistance R5
Third divider resistance R6
First end d
Second end s
Control terminal g
Second resistance R7
3rd resistor R8
4th resistance R9
5th resistance R10
Current-limiting resistance R11
Overheating protection unit 121
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, it is the electrical block diagram of one better embodiment of LED illumination circuit of the present invention.The LED
Lighting circuit 100 includes voltage generating unit 110, protection location 120, current generating unit 130 and LED branch 140.It is described
LED branch 140 includes at least a LED, and the voltage generating unit 110 includes a voltage output end 111, and the voltage generates
Unit 110 exports the operating voltage via the voltage output end 111, and for generating an operating voltage via institute
The output of protection location 120 is stated to the LED branch 140.The current generating unit 130 is for generating one drive circuit, to drive
Move the LED branch 140.Driving current of the protection location in the LED branch 140 is more than a predetermined current
When, cut off the connection between the LED branch 140 and the current generating unit 130.
In the present embodiment, the LED branch 140 includes three concatenated LED, it is possible to understand that ground, the LED branch
The number of concatenated LED in 140 is not limited to three.In other embodiments, the LED branch 140 may also comprise
The LED of multiple parallel connections.
The LED illumination circuit 100 further includes the first filter capacitor C0, the first filter capacitor C0 connection voltage
Output end 111, for filtering out the clutter in the operating voltage that the voltage generating unit 110 exports.
The protection location 120 includes one first connecting pin 120a and second connection end 120b.The protection location 120 is logical
It crosses the first connecting pin 120a and is connected to the voltage generating unit 110.
The LED illumination circuit 100 further includes the second filter capacitor C1 and the first divider resistance R1.Second filtered electrical
Hold the second connection end 120b that C1 connects the protection location 120, stablizes the voltage of output to the LED branch 140.
The current generating unit 130 includes voltage receiving end 130a, electric current generation chip 131 and current output terminal
130b.The voltage receiving end 130a connects the second connection end 120b of the protection location 120, for receiving the work electricity
Pressure.The electric current generates chip 131 and is used to generate the driving current according to the operating voltage, and the driving current is passed through
It is exported by the current output terminal 130b to the LED branch 140.
In the present embodiment, it is MBI1801 integrated chip that the electric current, which generates chip 131, and the MBI1801 integrates core
Piece includes an enabled pin OE, power pins VDD, grounding pin GND, output pin OUT and external resistance pins REXT.Its
In, when the enabled pin OE is low level, the MBI1801 integrated chip has electric current output；As an enabled pin OE
When for high level, the output of MBI1801 integrated chip no current.The enabled pin OE connection 1 of the MBI1801 integrated chip
One resistance R2 and second resistance R3 to the voltage receiving end 130a.The power pins VDD is connected to the first resistor R2
And the node between second resistance R3.Grounding pin GND ground connection, a switch K connection enabled pin OE and described connects
Ground pin GND.When switch K closure, the enable end OE is grounded (Ground), and a low level signal (0V) loads at this time
In the enabled pin OE.When the switch K is disconnected, the enabled pin OE loads a high level signal.One voltage-stabiliser tube ZD1
Node extremely between the first resistor R2 and second resistance R3, and the plus earth of the voltage-stabiliser tube ZD1, the voltage-stabiliser tube
The cathode of ZD1 is connected to the power pins VDD, for guaranteeing the power pins vdd voltage of the MBI1801 integrated chip
Stability.One first capacitor C2 connects the anode and cathode of the voltage-stabiliser tube ZD1, for guaranteeing the MBI1801 integrated chip
Power pins vdd voltage stability.The external resistance pins REXT is grounded by a reference resistance R4, by adjusting institute
The size of the resistance value of reference resistance R4 is stated, so as to adjust the size of the driving current of MBI1801 integrated chip output.
The output pin OUT connection current output terminal 130b, for exporting the driving current.
The LED illumination circuit 100 further includes the first divider resistance R1.The first divider resistance R1 is connected to the guarantor
It protects between unit 120 and the LED branch 140, for dividing and reducing the voltage of the current output terminal 130b.
Specifically, described one end first divider resistance R1 connects the voltage receiving end 130a, and the other end connects the LED
Branch 140b to the current output terminal 130b.Voltage on the current output terminal 130b determines that the electric current generates chip
The heat of 131 generation.When the voltage on the current output terminal 130b is higher, the current output terminal 130b load is in institute
The voltage for stating electric current generation chip 131 is higher, and it is more that the electric current generates the heat that chip 131 generates.When the electric current exports
When holding the voltage on 130b lower, voltage of the current output terminal 130b load on electric current generation chip 131 is lower,
It is less that the electric current generates the heat that chip 131 generates.Setting is gone here and there with the LED branch 140 in the LED illumination circuit 100
First divider resistance R1 of connection is loaded since the partial pressure of the first divider resistance R1 acts in the current output terminal 130b
Voltage reduce, it is lower that the electric current generates the voltage loaded on chip 131.The electric current generates the heat that chip 131 generates
It is smaller, improve the service life that the electric current generates chip 131.
It referring to Figure 2 together, is the electrical block diagram of protection location 120 shown in FIG. 1.The protection location
120 are also used to cut off the electricity when the operating voltage that the voltage generating unit 110 generates is more than a preset voltage value
Pressure generates the connection of unit 110 and the LED branch.
The protection location 120 includes switch unit a Q1, a zener diode D1, transient voltage inhibition diode
(Transient Voltage Suppressor, TVS) D2, (Silicon Controlled Rectifier) SCR, second
Divider resistance R5 and third divider resistance R6.The switch unit Q1 includes first end d, second end s and control terminal g.The control
End processed is opened or closed by controlling the first end d and second end s to control the switch unit Q1 cut-off or conducting.
Specifically, when the control terminal g controls the first end d and second end s under the control of external control signal to be disconnected,
The switch unit Q1 cut-off；When the control terminal g controls the first end d and described under the control of external control signal
When two end s are closed, the switch unit Q1 conducting.First end d connection the first connecting pin 120a, to receive the work
Make voltage.The second end s connects the cathode of the transient voltage suppressor diode D2, the transient state by a second resistance R7
The anode of voltage suppression diode D2 connects the cathode of the one-way commutation controllable silicon SCR by a 3rd resistor R8.The list
The control terminal g of the switch unit Q1 is connected to by the second divider resistance R5 to the anode of rectification thyristor SCR.
The third divider resistance R6 is connected between the first end d and the control terminal g.The anode of the zener diode D1 is even
The node between the 3rd resistor R8 and transient voltage suppressor diode D2 anode is connect, the zener diode D1's is negative
Pole connects the control pin of the one-way commutation controllable silicon SCR.One the 4th one end resistance R9 connects the zener diode D1's
The node of the control pin of cathode and the one-way commutation controllable silicon SCR, the other end connect described the of the switch unit Q1
Two end s.One the 5th one end resistance R10 connects the first end d of the switch unit Q1, and the other end connects second divider resistance
Node between R5 and the anode of the one-way commutation controllable silicon SCR.One one end current-limiting resistance R11 passes through place second connection end
The 120b connection LED branch 140, the other end connect the control of the one-way commutation controllable silicon SCR by the 4th resistance R9
Pin processed.One second one end capacitor C3 connects the first end d of the switch unit Q1, the other end connect the 3rd resistor R8 with
Node between the cathode of the one-way commutation controllable silicon SCR.One third one end capacitor C4 ground connection, other end connection described second
Node between resistance R7 and the cathode of the transient voltage suppressor diode D2.
When the operating voltage is more than the preset voltage value, the second end s voltage of the switch unit Q1 compared with
Height, thus, the voltage of the cathode of the transient voltage suppressor diode D2 is higher, the transient voltage suppressor diode D2 conducting
And the one-way commutation controllable silicon SCR conducting.In turn, the voltage value of the control terminal g of the switch unit Q1 reduces, the switch
The control terminal g of unit Q1 loads a low level signal, and the switch unit Q1 controls institute under the control of the low level signal
It states the first end d and second end g to disconnect, and then the switch unit Q1 ends.It can be seen that when the operating voltage is more than
When the preset voltage value, the switch unit Q1 is cut off between the voltage generating unit 110 and the LED branch 140
Interface channel, to protect the LED branch 140 not to be burned.
When the driving current in the LED branch 140 is more than the pre-set current value, the current-limiting resistance R11 is flowed through
On electric current increase, the voltage drop on the current-limiting resistance R11 increases, the one-way commutation controllable silicon SCR conducting.In turn, institute
The voltage value for stating the control terminal g of switch unit Q1 reduces, and the control terminal g of the switch unit Q1 loads a low level signal, institute
Switch unit Q1 is stated under the control of the low level signal, the first end d and second end g is controlled and disconnects, Jin Ersuo
State switch unit Q1 cut-off.It can be seen that the switch unit Q1 is cut when the driving current is more than the pre-set current value
The interface channel to break between the LED branch 140 and the current generating unit 130, with protect the LED branch 140 not by
It burns out.
In the present embodiment, the switch unit Q1 is N-channel metal oxide semiconductor transistor (N-channel
Metal-oxide-semiconductor field effect transistor, NMOSFET), the control terminal g is the N
The grid of channel metal oxide semiconductor transistor, the first end d and the second end s are respectively the N-channel metal
Oxide semi conductor transistor drain electrode and source electrode.
The overheating protection unit 120 further includes an overheating protection unit 121, for working as the heat of the LED branch 140
When more than a preset temperature, the LED branch 140 is cut off.The preset temperature is when the LED branch 140 works normally
Maximum temperature, when the temperature of the LED branch 140 is more than the preset temperature, the LED branch 140, which will face, to be burned
Danger.
In the present embodiment, the overheating protection unit 121 includes a thermistor, it is preferable that the thermistor
For posive temperature coefficient thermistor.As the temperature rises, resistance value increases the posive temperature coefficient thermistor, when described
When the heat of LED branch is more than a preset temperature, the LED branch 140 is cut off, to realize overheating protection.
Intersect with the prior art, LED illumination circuit 100 of the present invention, since the LED illumination circuit 100 includes that protection is single
Member 120, the protection location 120 are used in the driving current that the current generating unit 130 generates be more than a default electricity
When flow valuve, the connection between the LED branch 140 and the current generating unit 130 is cut off.To reach the LED branch
When the driving current on road 140 is excessive, the technical effect of overcurrent protection is carried out to the LED branch 140.
Further, the operating voltage that LED illumination circuit 100 of the present invention can also be generated in the voltage generating unit 110
When more than a preset voltage value, the connection between the voltage generating unit 110 and the LED branch 140 is cut off, to reach
When the operating voltage of the LED branch 140 is excessive, the technical effect of overvoltage protection is carried out to the LED branch 140.
Further, LED illumination circuit 100 of the present invention can also be more than a preset temperature in the heat of the LED branch 140
When, cut off the LED branch 140.To reach the technical effect for carrying out overheating protection to the LED branch 140.
The above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to preferred embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that, it can modify to technical solution of the present invention
Or equivalent replacement, without departing from the spirit and scope of the technical solution of the present invention.
Claims (8)
1. a kind of LED illumination circuit, which is characterized in that the LED illumination circuit includes LED branch, voltage generating unit, electric current
Unit and protection location are generated, the LED branch includes at least a LED, and the voltage generating unit is for generating a job
Voltage, and the operating voltage is exported via the protection location to the LED branch, the current generating unit is for producing
A raw driving current, to drive the LED branch, driving current of the protection location in the LED branch is more than
When one pre-set current value, the connection between the LED branch and the current generating unit is cut off；The protection location further includes
One switch unit, transient voltage inhibit silicon-controlled diode, one-way commutation, the second divider resistance and third divider resistance, institute
Stating switch unit includes first end, second end and control terminal, and the control terminal is by controlling the first end and the second end
It disconnects and is closed to control the switch unit cut-off and conducting, the first end and receive the operating voltage, the second end
The cathode of the transient voltage suppressor diode is connected, and the second end connects the LED branch, the transient voltage inhibits
The anode of diode connects the silicon-controlled cathode of the one-way commutation, and the silicon-controlled anode of the one-way commutation passes through described second
Divider resistance connects the control terminal of the switch unit, and the third divider resistance is connected to the first end and the control terminal
Between, when the operating voltage is more than preset voltage value, the transient voltage suppressor diode and the one-way commutation are controllable
Silicon conducting, the control terminal controls the first end and the second end disconnects, the switch unit cut-off.
2. LED illumination circuit as described in claim 1, which is characterized in that the current generating unit is received including a voltage
End, electric current generate chip and a current output terminal, and the voltage receiving end is generated for receiving the operating voltage, the electric current
Chip is used to generate the driving current according to the operating voltage, and the driving current is defeated via the current output terminal
Out.
3. LED illumination circuit as claimed in claim 2, which is characterized in that the LED illumination circuit further includes one first partial pressure
Resistance, one end of first divider resistance connect the voltage receiving end, and the other end is connected to described by the LED branch
Current output terminal, first divider resistance for reducing the current output terminal voltage.
4. LED illumination circuit as described in claim 1, which is characterized in that the protection location includes a current-limiting resistance and the
Four resistance, described current-limiting resistance one end connect the LED branch, and the other end of the current-limiting resistance is connected by the 4th resistance
The silicon-controlled control pin of the one-way commutation is connect, it is described unidirectional whole when the driving current is greater than the pre-set current value
Controlled silicon conducting is flowed, the control terminal controls the first end and the second end disconnects, the switch unit cut-off.
5. the LED illumination circuit as described in claim 1 or 4 any one, which is characterized in that the switch unit is N-channel
Metal oxide semiconductor transistor, the control terminal is the grid of the N-channel metal oxide semiconductor transistor, described
First end and the second end are respectively the N-channel metal oxide semiconductor transistor drain electrode and source electrode.
6. LED illumination circuit as described in claim 1, which is characterized in that the protection location further includes an overheating protection list
Member, for cutting off the LED branch when the heat of the LED branch is more than a preset temperature.
7. LED illumination circuit as claimed in claim 6, which is characterized in that the overheating protection unit includes thermistor.
8. LED illumination circuit as claimed in claim 7, which is characterized in that the thermistor be positive temperature coefficient thermal electricity
Resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310648746.9A CN104684198B (en) | 2013-12-03 | 2013-12-03 | LED illumination circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310648746.9A CN104684198B (en) | 2013-12-03 | 2013-12-03 | LED illumination circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104684198A CN104684198A (en) | 2015-06-03 |
| CN104684198B true CN104684198B (en) | 2018-11-27 |
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ID=53318615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310648746.9A Active CN104684198B (en) | 2013-12-03 | 2013-12-03 | LED illumination circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN104684198B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201663735U (en) * | 2010-01-06 | 2010-12-01 | 深圳市爱能科技有限公司 | LED power supply |
| JP2012059839A (en) * | 2010-09-07 | 2012-03-22 | Rohm Co Ltd | Drive circuit of light emitting element, light emitting device using the same, and electronic device |
| CN202453371U (en) * | 2012-02-08 | 2012-09-26 | 河海大学 | Large-scale particle image velocimetry (PIV) |
| CN102752912A (en) * | 2012-06-01 | 2012-10-24 | 台达电子企业管理（上海）有限公司 | Light-emitting diode (LED) driving circuit |
-
2013
- 2013-12-03 CN CN201310648746.9A patent/CN104684198B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201663735U (en) * | 2010-01-06 | 2010-12-01 | 深圳市爱能科技有限公司 | LED power supply |
| JP2012059839A (en) * | 2010-09-07 | 2012-03-22 | Rohm Co Ltd | Drive circuit of light emitting element, light emitting device using the same, and electronic device |
| CN202453371U (en) * | 2012-02-08 | 2012-09-26 | 河海大学 | Large-scale particle image velocimetry (PIV) |
| CN102752912A (en) * | 2012-06-01 | 2012-10-24 | 台达电子企业管理（上海）有限公司 | Light-emitting diode (LED) driving circuit |
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| Publication number | Publication date |
|---|---|
| CN104684198A (en) | 2015-06-03 |
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