CN209120507U - A kind of LED linear constant-flow driver - Google Patents
A kind of LED linear constant-flow driver Download PDFInfo
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- CN209120507U CN209120507U CN201721125454.7U CN201721125454U CN209120507U CN 209120507 U CN209120507 U CN 209120507U CN 201721125454 U CN201721125454 U CN 201721125454U CN 209120507 U CN209120507 U CN 209120507U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model discloses a kind of LED linear constant-flow drivers, including rectification circuit, performance loop, constant-current control circuit, voltage detecting circuit, soft starting circuit and external control circuit, soft starting circuit includes charging and discharging circuit, using resistance R7, resistance R8, triode T5 and capacitor C1 constitutes charging and discharging circuit, when power cut-off, triode T5 saturation conduction, the electric energy on capacitor C1 can be discharged rapidly in a very short period of time, the soft start function that will not influence product is powered on after power-off at once, efficiently solve the problems, such as that conductive discharge is slow-paced, using extremely simple circuit design, solves complex technical problem, also has the function of function of temperature compensation control, soft start function and external dimmer function, it can be convenient the intelligent control and wireless Internet of Things for realizing LED lamp, improve driving The comprehensive performance of device and cost is made to decline to a great extent.
Description
Technical field
The utility model relates to a kind of LED drive circuit, especially a kind of LED constant current soft start driving circuit.
Background technique
The charging and discharging circuit that linear constant current driver in the prior art uses resistance and capacitor C parallel connection to constitute is soft to realize
Start-up circuit discharges to capacitor using resistance, and the electric energy for needing regular hour capacitor to store can discharge completely, power off
In the short time powered at once afterwards, due to the electric energy release completely not yet of capacitor, soft start is caused to fail.
Summary of the invention
For overcome the deficiencies in the prior art, the utility model provides a kind of simple circuit, energy high without EMI, constant current accuracy
Biggish scope range of the fluctuation of voltage is born, has the function of the LED linear constant-flow driver of function of temperature compensation control, soft start function.
The technical scheme adopted by the utility model to solve the technical problem is as follows:
A kind of LED linear constant-flow driver, including performance loop and soft starting circuit, the performance loop include field-effect
Pipe T1, the drain D of the field-effect tube T1 is connected with LED load is followed by the anode of DC power supply, the leakage of the field-effect tube T1
Pole D and the contact of LED load are named as node 6；The source S of the field-effect tube T1 is connect publicly by resistance R2, and grid G is logical
It crosses resistance R1 and connects the node 6, the contact of the grid G of the resistance R1 and field-effect tube T1 is named as node 7, the resistance R2
Node 10 is named as with the contact of the source S of the field-effect tube T1；The soft starting circuit includes charging and discharging circuit, described to fill
Discharge loop passes through contact 7 described in one-way isolation circuit connection；The charging and discharging circuit includes resistance R7, resistance R8, positive-negative-positive three
Pole pipe T5 and capacitor C1；The resistance R7, resistance R8 connect the anode of the latter termination DC power supply, and another termination is public
One end of ground, the emitter E of the triode T5 and the capacitor C1 connect altogether is followed by the one-way isolation circuit, the triode
The base stage B of T5 connects the contact of the resistance R7 and resistance R8, and collector C connects publicly, and another termination of the capacitor C1 is public
The contact of ground, the emitter E of the triode T5 and the capacitor C1 are named as node 8.
The one-way isolation circuit includes diode D5, and the cathode of the diode D5 connects the node 8, and anode connects described
Node 7.
Further, the driving circuit of the utility model further includes external control circuit, the external control circuit with it is described
Node 7 is connected.
The external control circuit includes PNP type triode T4, and the emitter E of the triode T4 connects the node 7, collection
Electrode C connects publicly, and base stage B divides two-way, connects the node 7 by resistance R5 all the way, another way connects outside by diode D6
Signal control terminal.
The base stage B of the triode T4 and publicly between be connected with light adjusting circuit, the light adjusting circuit be potentiometer W or
Photo resistance.
Further, the driving circuit of the utility model further includes constant-current control circuit, and the constant-current control circuit includes NPN
Type triode T2, the base stage B of the triode T2 connect the node 10, and collector C connects the node 7, and emitter E connects public
Ground.
Further, the driving circuit of the utility model further includes voltage detecting circuit, and the voltage detecting circuit includes electricity
After hindering R3, resistance R4 and NPN type triode T3, the resistance R3 and resistance R4 series connection, a termination node 6, another termination
Publicly, wherein the contact of resistance R3 and resistance R4 are named as node 11；The base stage B of the triode T3 connects the node 11,
Collector C connects the node 7 by resistance R6, and emitter E connects publicly.
The node 7 and publicly between be connected with temperature-compensation circuit.
The beneficial effects of the utility model are: the utility model uses resistance R7, resistance R8, triode T5 and capacitor C1 structure
At charging and discharging circuit, when power cut-off, triode T5 saturation conduction can be discharged rapidly in a very short period of time on capacitor C1
Electric energy powers on the soft start function that will not influence product at once after power-off, efficiently solve that conductive discharge is slow-paced to ask
Topic, using extremely simple circuit design, solves complex technical problem, has simple circuit, without EMI, constant current essence
The advantages that degree is high, can bear biggish scope range of the fluctuation of voltage, it may have function of temperature compensation control function, soft start function and external tune
Light function can be convenient the intelligent control and wireless Internet of Things for realizing LED lamp, improve the comprehensive performance of driver and make cost
It declines to a great extent, can be made dedicated integrated LED driving chip, not only simplify layout design, also make the cost of integrated circuit big
It is big to reduce, and function and performance have reached the grade that extremely complex circuit design can be completed.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
Referring to Fig.1, a kind of LED linear constant-flow driver, including DC power supply, performance loop, external control circuit, constant current
Control circuit, voltage detecting circuit and soft starting circuit.
The performance loop includes field-effect tube T1, the drain D and LED load (node 5 and node of the field-effect tube T1
It is LED load between 6) connecting is followed by the anode of DC power supply (rectifier bridge that DC power supply is made of rectifier diode D1-D4)
(node 4), for the convenience of description, the drain D of the field-effect tube T1 and the contact of LED load are named as node 6；The field effect
Should the source S of pipe T1 connect publicly (node 9) by resistance R2, grid G meets the node 6, the resistance R1 by resistance R1
Node 7, the contact of the source S of the resistance R2 and field-effect tube T1 are named as with the contact of the grid G of field-effect tube T1
It is named as node 10.
The soft starting circuit includes charging and discharging circuit, and the charging and discharging circuit described in one-way isolation circuit connection by connecing
Point 7.
The charging and discharging circuit includes resistance R7, resistance R8, PNP type triode T5 and capacitor C1；The resistance R7, resistance
R8 connects the anode of the latter termination DC power supply, another termination publicly, the emitter E of the triode T5 and the electricity
The one end for holding C1 connects altogether is followed by the one-way isolation circuit, and base stage B connects the contact of the resistance R7 and resistance R8, and collector C connects
Publicly, another termination of the capacitor C1 publicly, name by the contact of the emitter E of the triode T5 and the capacitor C1
For node 8.
The one-way isolation circuit includes diode D5, and the cathode of the diode D5 connects the node 8, and anode connects described
Node 7.
The external control circuit is connected with the node 7, and specifically, the external control circuit includes positive-negative-positive three
Pole pipe T4, the emitter E of the triode T4 connect the node 7, and collector C connects publicly, and base stage B divides two-way, pass through all the way
Resistance R5 connects the node 7, and another way connects external signal control terminal (node 12) by diode D6.
The constant-current control circuit includes NPN type triode T2, and the base stage B of the triode T2 connects the node 10, collection
Electrode C connects the node 7, and emitter E connects publicly.
The voltage detecting circuit includes resistance R3, resistance R4 and NPN type triode T3, the resistance R3 and resistance R4 string
After connection, a termination node 6, another termination is publicly, wherein the contact of resistance R3 and resistance R4 are named as node 11；Institute
The base stage B for stating triode T3 connects the node 11, and collector C connects the node 7 by resistance R6, and emitter E connects publicly.
The node 7 and publicly between be connected with temperature-compensation circuit.
1. current constant control part
It is realized by performance loop and constant-current control circuit, alternating current (220VAC) is respectively connected to the ac input end of rectifier bridge
1,2, after over commutation, exporting a peak value in the DC voltage output end 3,4 of rectifier bridge is 1.414 times of AC voltage of input
DC pulse moving voltage, if input voltage is AC220 V, then the crest voltage of output end 3,4 is DC311.08V, passes through field-effect
The working current loop of pipe T1, resistance R2 composition LED load.The operating current size of LED load is controlled by field-effect tube T1, and
The working condition of field-effect tube T1 is controlled by the constant-current control circuit control being made of triode T2, resistance R1 and resistance R2 again,
Resistance R1 provides an operating voltage for the grid G of field-effect tube T1, and the level height of this voltage directly affects field effect
Should pipe T1 output electric current, so, efficiently control this level, also just directly controlled the electric current of LED load.Resistance R2 is used
Detect LED load electric current, when electric current passes through resistance R2, a voltage will be generated at the both ends resistance R2, this voltage it is big
It is small related with the resistance value of resistance R2 and by the size of electric current I of resistance R2, its calculation formula is: V=IR, this voltage quilt
Triode T2 sampling is amplified, and the working condition of field-effect tube T1 grid G is controlled by the collector C of triode T2, it is assumed that
The operating current for setting LED load is 100mA, and the magnification region window of triode T2 is between 0.5-0.6V, sampling voltage
It is set in 0.5V, then, according to the principle of V=IR, the resistance value for calculating resistance R2 is 5 ohm, so, when the electricity of LED load
When stream is greater than the set value, sampling voltage will rise with it in proportion, due to the amplification of triode T2, the electricity of collector C
Position drags down therewith, has directly controlled the operating voltage of field-effect tube T1 grid G, has declined the output electric current of field-effect tube T1；When
When the electric current of LED load is less than setting value, then sampling voltage will decline therewith in proportion, due to the amplification of triode T2,
Rise with it the current potential of triode T2 collector C also, the output electric current of field-effect tube T1 increases, therefore, the electric current of LED load
It is locked in setting value.
2, voltage detecting control section
It is realized by voltage detecting circuit, when work, between the DC output end voltage of rectification circuit and the voltage of LED load
There is certain pressure difference, this pressure difference is undertaken by field-effect tube T1 and resistance R2, and pressure difference signal is also reflected directly in resistance R3
Between resistance R4, after resistance R3 and resistance R4 partial pressure, the base stage B of triode T3 is fed to by node 11, by three
After pole pipe T3 amplification, the grid G (node 7) of field-effect tube T1 is fed to by resistance R6.
Under normal circumstances, when supply voltage (AC-input voltage) changes, pressure difference also changes simultaneously, supplies
In normal state, triode T3 is maintained at the lower limit value of initial working region to piezoelectric voltage, and the current potential of collector C is maintained at conjunction
In suitable range, field-effect tube T1 is supplied to LED load according to normal electric current.
When supply voltage is lower than normal value, the current potential decline of node 11, triode T3 ends, on the current potential of collector C
It rises, the voltage of field-effect tube T1 grid G is compensated for a certain extent, in this way, supply voltage fluctuates downwards in certain amplitude still
So being able to maintain field-effect tube T1 has stable electric current output.
If supply voltage fluctuates upwards, when being more than normal value, the current potential of node 11 is also risen with it, due to triode T3
Amplification, the current potential of the collector C of triode T3 declines therewith, by resistance R6, dragged down the current potential of node 7, made field
The output electric current of effect pipe T1 is reduced, and has effectively suppressed the rising of reactive power caused by rising as input voltage, also greatly
The big temperature for reducing field-effect tube T1 and being generated due to idle power consumption.
In addition, resistance R3 can also be skipped to node 6, directly since resistance R3 and resistance R4 constitutes voltage-dividing detection circuit
It is connected to 4 ends that node 5(is equivalent to rectifier bridge), its working principle is that the same.
3, soft start control section
It is realized by soft starting circuit, adjusts the resistance value of resistance R7 and resistance R8 to change the intrinsic standoff ratio of the two, circuit is made to exist
When normal work, the base potential of triode T5 is high level, and triode T5 is in off state, when powering on, is mentioned by resistance R1
The operating voltage for supplying field-effect tube T1, first charged to capacitor C1 by diode D5, in the wink that power supply has just been connected
Between, the internal resistance very little at the both ends capacitor C1, the transient voltage at both ends is approximately 0V, and the voltage of field-effect tube T1 grid G is pulled low
And it is in off state.With the increase in charging time, the voltage at the both ends capacitor C1 slowly rises, after reaching threshold value, field-effect
Pipe T1 enters working condition, and the output electric current of drain D also slowly rises, the electric current of LED load also therewith since 0 slowly on
It rises, until the current value of setting, soft start-up process is completed, when power cut-off, due to 4 end loss of voltage of node, triode T5
It being grounded by resistance R7, the rapid saturation conduction of triode T5 can discharge rapidly the electric energy on capacitor C1 in a very short period of time, with
Just it restPoses when re-powering the short time, powers on the soft start function that will not influence product after power-off at once, have
Effect solves the problems, such as that conductive discharge is slow-paced.The effect of diode D5 be the voltage at the both ends capacitor C1 is played unidirectionally every
From avoiding after completing soft start, voltage (node 8) Xiang Jiedian 7 of capacitor C1 flows backward, and causes field-effect tube T1 lags in response.
4, temperature-compensating part
It is realized by temperature-compensation circuit.Transistor all has a sensitivity characteristic to temperature, especially small signal triode,
In the present embodiment, on the one hand triode T2, triode T3 bear the current regulation to field-effect tube T1, are on the other hand even more one
A temperature sensor of good performance, when operating temperature is more than 80 degrees Celsius, triode T2, triode T3 internal resistance will be with
The rising of temperature and decline, to drag down the current potential of node 7, also just directly dragged down the output electric current of field-effect tube T1, reached
Arrived the effect of temperature-compensating, can also in node 7 and publicly between connect thermally sensitive element or circuit, such as temperature-sensitive
Resistance etc..
5, external control circuit part
In today of scientific and technological high development, illuminator is also fast-developing towards intelligent and wireless Internet of Things direction, because
This, it is particularly necessary to have intelligent interface to LED driver.
Usually, when external signal control terminal (node 12) is vacant, triode T4 is in off state, entire power-supply system
Work it is almost unrelated with it, in the present embodiment, external signal control terminal can receive voltage amplitude be 0-5.5V, duty ratio
For the pwm signal of 0-100%, when pwm signal access, triode T4 works in switch state, when pwm signal is in low level
When, triode T4 conducting drags down the level of the node 7 of internal circuit, field-effect tube T1 is forced to end, and pwm signal is in height
When level, then triode T4 ends, and field-effect tube T1 resumes work, in this way, just making the working condition and input of field-effect tube T1
Pwm signal be consistent.
In addition to this, external signal control terminal (node 12) is also compatible with the external voltage source input control of 0-5.5V, some
Place needs to control the brightness of LED load using external voltage, this interface is still suitble to, in this case, triode
T4 is in the working region of Linear Amplifer, and for base stage B current potential in 5V, triode T4 is completely switched off, in addition diode D6 is just
To pressure drop about 0.5V, inputting effectively control level is up to 5.5V, and when incoming level is 0V, triode T4 is fully saturated to be led
Logical, when input voltage changes between 0-5.5V, the conducting depth of triode T4 then changes with the variation of voltage, thus
Also field-effect tube T1 output electric current is controlled to change therewith.
External signal control terminal (node 12) can also be compatible with multiple sensors access, and there are many current common sensors
Type and specification, such as: infrared, ultrasonic wave, radar, photoelectricity, acoustic control, wherein sensor module is divided into active output and nothing again
Source exports two major classes, the sensor module of active output, and output end provides a DC voltage, does height in sensor actuation
Low level switching, there are many specifications for voltage output, common are 6V, 12V, 24V etc..The sensor of passive output type, one
As be to provide a group relay make and break contact, the contact is opened or closed in sensor actuation.The sensing of the above type
Device is suitable for accessing in this circuit.The effect of diode D6 is to carry out voltage isolation to various types of sensors, avoids difference
Voltage has an impact circuit.
Currently used transistor has NPN type triode, PNP type triode, N-type field-effect tube, p-type field-effect tube, specially
The technical staff in industry field, which can according to need, selects corresponding component, and according to the corresponding wiring of the type change of component
Different types of Replacement of Electronic Components can be used under certain conditions in mode, and circuit operation principle and function are identical.
The driving circuit of the utility model can be equivalent to a two end constant flow modules, when work, without being additionally provided work
Make power supply, therefore its pressure difference can be made small, realize the low voltage difference concept of Linear Driving.In addition, due to LED load and this reality
It is series relationship with novel driving circuit, therefore LED load can be serially connected in the positive terminal of DC power supply, can also be connected on straight
The negative pole end in galvanic electricity source.When necessary, the driving circuit of the utility model multiple can also be together in series use, to improve circuit
Power consumption bearing capacity.
The utility model uses extremely simple circuit design, solves complex technical problem, improves driving
The comprehensive performance of device and cost is made to decline to a great extent, can be made dedicated integrated LED driving chip, not only simplify layout design,
Also substantially reduce the cost of integrated circuit, and function and performance have reached what extremely complex circuit design can be completed
Grade, the principle based on the invention, the technical staff of professional domain can make the modification of some adaptability, not depart from this
The electronic component or circuit done under the premise of innovation and creation objective is directly replaced or equivalent variations, still falls within wound of the present invention
It makes within the scope of covering.
Claims (7)
1. a kind of LED linear constant-flow driver, including performance loop and soft starting circuit, the performance loop include field-effect tube
T1, the drain D of the field-effect tube T1 is connected with LED load is followed by the anode of DC power supply, the drain D of the field-effect tube T1
Node 6 is named as with the contact of LED load；The source S of the field-effect tube T1 is connect publicly by resistance R2, and grid G passes through
Resistance R1 connects the node 6, and the contact of the grid G of the resistance R1 and field-effect tube T1 is named as node 7, the resistance R2 with
The contact of the source S of the field-effect tube T1 is named as node 10；The soft starting circuit includes charging and discharging circuit, the charge and discharge
Electrical circuit passes through contact 7 described in one-way isolation circuit connection；It is characterized in that the charging and discharging circuit includes resistance R7, resistance
R8, PNP type triode T5 and capacitor C1；The resistance R7, resistance R8 connect the anode of the latter termination DC power supply, another
Publicly, one end of the emitter E of the triode T5 and the capacitor C1 connect altogether is followed by the one-way isolation circuit, institute to termination
The base stage B for stating triode T5 connects the contact of the resistance R7 and resistance R8, and collector C connects publicly, and the capacitor C1's is another
Publicly, the contact of the emitter E of the triode T5 and the capacitor C1 are named as node 8 to termination.
2. LED linear constant-flow driver according to claim 1, it is characterised in that the one-way isolation circuit includes two poles
Pipe D5, the cathode of the diode D5 connect the node 8, and anode connects the node 7.
3. LED linear constant-flow driver according to claim 1, it is characterised in that the driving circuit further includes external control
Circuit, the external control circuit are connected with the node 7.
4. LED linear constant-flow driver according to claim 3, it is characterised in that the external control circuit includes PNP
Type triode T4, the emitter E of the triode T4 connect the node 7, and collector C connects publicly, and base stage B divides two-way, all the way
The node 7 is connect by resistance R5, another way connects external signal control terminal by diode D6.
5. LED linear constant-flow driver according to claim 1, it is characterised in that the driving circuit further includes current constant control
Circuit, the constant-current control circuit include NPN type triode T2, and the base stage B of the triode T2 connects the node 10, collector
C connects the node 7, and emitter E connects publicly.
6. LED linear constant-flow driver according to claim 1, it is characterised in that the driving circuit further includes voltage detecting
Circuit, the voltage detecting circuit include resistance R3, resistance R4 and NPN type triode T3, the resistance R3 and resistance R4 series connection
Afterwards, a termination node 6, another termination is publicly, wherein the contact of resistance R3 and resistance R4 are named as node 11；It is described
The base stage B of triode T3 connects the node 11, and collector C connects the node 7 by resistance R6, and emitter E connects publicly.
7. LED linear constant-flow driver according to claim 1, it is characterised in that the node 7 and publicly between connect
It is connected to temperature-compensation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721125454.7U CN209120507U (en) | 2017-09-04 | 2017-09-04 | A kind of LED linear constant-flow driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721125454.7U CN209120507U (en) | 2017-09-04 | 2017-09-04 | A kind of LED linear constant-flow driver |
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| Publication Number | Publication Date |
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| CN209120507U true CN209120507U (en) | 2019-07-16 |
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ID=67194621
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| CN201721125454.7U Expired - Fee Related CN209120507U (en) | 2017-09-04 | 2017-09-04 | A kind of LED linear constant-flow driver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111555597A (en) * | 2020-03-31 | 2020-08-18 | 芜湖宏景电子股份有限公司 | Residual current discharge circuit of DDR chip power supply circuit |
-
2017
- 2017-09-04 CN CN201721125454.7U patent/CN209120507U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111555597A (en) * | 2020-03-31 | 2020-08-18 | 芜湖宏景电子股份有限公司 | Residual current discharge circuit of DDR chip power supply circuit |
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| CF01 | Termination of patent right due to non-payment of annual fee |