CN108966430A - A kind of LED illumination lamp linear drive circuit of high photosynthetic efficiency - Google Patents
A kind of LED illumination lamp linear drive circuit of high photosynthetic efficiency Download PDFInfo
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- CN108966430A CN108966430A CN201811014702.XA CN201811014702A CN108966430A CN 108966430 A CN108966430 A CN 108966430A CN 201811014702 A CN201811014702 A CN 201811014702A CN 108966430 A CN108966430 A CN 108966430A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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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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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of high light efficiency LED illuminator linear drive circuits, are made of input protection circuit, bridge rectifier, constant-current control circuit, four part of over-voltage breaking circuit.The constant-current control circuit is similar to LED illumination lamp conventional linear driving circuit, over-voltage breaking circuit is connected between constant-current control circuit negative terminal and rectifier bridge negative terminal, it is made of input voltage sample circuit, reference power source, comparator CP, N ditch power switch tube, it is generally applicable in middle low power plurality of LED light sources illuminator, with light efficiency height, the advantages that current constant control tube temperature liter is small, powers on little surge current, wide input voltage range.
Description
Technical field
The present invention relates to field of LED illumination, more particularly, to a kind of LED illumination lamp Linear Driving electricity of high photosynthetic efficiency
Road.
Background technique
LED light source has the advantages that environmental protection, energy conservation, long service life, driving voltage are low etc., are acknowledged as 21st century most
Promising lighting source.Due to the limitation of the factors such as cost, lamps and lanterns volume, EMI interference, in recent years middle low power LED illumination
Lamps and lanterns, such as bulb lamp, light pipe, ceiling lamp, shot-light mostly use linear drive mode.The driving of conventional belt capacitor filtering LED linear
Circuit is mainly by protective tube FUSE, varistor VR, bridge rectifier BR, filter capacitor C, series LED chipset, LED operation
Current sampling resistor Rs, current amplifier CA, reference voltage source Vref, adjustment pipe Q and biasing circuit etc. part form, such as it is attached
Shown in Fig. 2.Although this kind of linear drive circuit has the advantages that element is few, at low cost, EMI is small, it can only operate in exchange
Input voltage variation is no more than 5% power supply occasion, such as the LED chip group selected by 220V input voltage, when exchange inputs
Voltage UINWhen higher, pipe Q drain source voltage V is adjustedDSAlso increase synchronous, not only decline power-efficient rapidly, also exacerbate
The temperature for adjusting pipe Q will lead to adjustment pipe Q and cross cause thermal damage when serious；On the other hand, as input voltage UINIt is relatively low, bridge rectifier
Device BR output voltage VINLess than series LED chipset operating voltage VFWhen, the decline of series LED chipset electric current is flowed through, will be occurred
Serious stroboscopic phenomenon.Third is that filter capacitor C capacity is larger, powered on moment surge current is big, may also need to input in exchange
The not high thermistor of reliability of connecting in circuit.
Summary of the invention
This provides a kind of LED illumination lamp line of high photosynthetic efficiency in order to overcome at least one of the drawbacks of the prior art described above
Property driving circuit.
Including input protection circuit, bridge rectifier, constant-current control circuit, over-voltage breaking circuit；
The constant-current control circuit is by storage capacitor C1, series LED chipset, LED operation current sampling resistor RS, electricity
Stream amplifier CA, reference voltage source, adjustment pipe Q1 and biasing circuit 1 form；The over-voltage breaking circuit is by first voltage
Sample resistance R1, second voltage sample resistance R2, high-frequency filter capacitor C2, comparator CP, power switch tube Q2, biasing circuit 2,
And lightning protection device VR2 composition；Input protection circuit is made of protective tube FUSE and varistor VR1；
The storage capacitor C1 anode meets bridge rectifier BR positive output end VIN, cathode and constant-current control circuit negative terminal
GNDS is connected；Biasing circuit 1 gives current amplifier CA, reference voltage Vref1Bias supply is provided, bridge rectifier is just terminated
The positive output end V of BRIN, negative terminal meets constant-current control circuit negative terminal GNDS；Series LED chipset is just terminating bridge rectifier BR just
Output end VIN, negative terminal connect adjustment pipe Q1 drain D；The source S of the termination adjustment of current sampling resistor RS mono- pipe Q1, another termination are permanent
Flow control circuit negative terminal GNDS；The source S of current amplifier CA anti-phase input termination adjustment pipe Q1, homophase input terminate benchmark electricity
Source Vref1, the grid G of output termination adjustment pipe Q1；
The drain D of the termination adjustment of the first voltage sample resistance R1 mono- pipe Q1 of the over-voltage breaking circuit, i.e. LED series connection
The negative terminal of chipset, the inverting input terminal of another termination comparator CP；Second voltage sample resistance R2 mono- terminates comparator CP's
Inverting input terminal, another termination bridge rectifier BR negative terminal GND；High-frequency filter capacitor C2 is attempted by second voltage sample resistance R2
Both ends；The homophase input of comparator CP terminates reference power supply Vref2, the grid G of the output termination switching tube Q2 of comparator CP；
Switching tube Q2 drain D meets constant-current control circuit negative terminal GNDS, and source S meets bridge rectifier BR negative terminal GND；Biasing circuit 2 give than
Compared with device CP, reference voltage Vref2Bias supply is provided, the positive output end V of bridge rectifier BR is just being terminatedIN, it is whole that negative terminal connects bridge-type
Flow the negative terminal GND of device BR.
Preferably, the power switch tube Q2 in the over-voltage breaking circuit is N ditch power MOS pipe.
Preferably, the series LED chipset is at least 1.
Preferably, the end firewire L of a termination exchange input of the input protection circuit protective tube FUSE, protective tube
The exchange incoming end of another termination bridge rectifier BR, the zero of another exchange access termination exchange input of bridge rectifier BR
Line N-terminal；The both ends of varistor VR1 connect two exchange incoming ends of bridge rectifier BR respectively.
Preferably, between the switching tube drain-source pole in the over-voltage breaking circuit can lightning protection element in parallel, such as
Varistor, discharge tube or TVS pipe etc.；Lightning protection element in the over-voltage breaking circuit can and in switching tube drain D
The small capacitances that series diode and a capacity are 1 μ of μ F~2.2 F between rectifier bridge negative terminal GND, then just by biasing circuit 2
Hold reconfiguration to the anode of small capacitances.Specific connection are as follows: diode D2 anode connects the drain D of switching tube Q2, and cathode connects capacitor C3's
Anode；The cathode of capacitor C3 meets the negative terminal GND of bridge rectifier BR；The anode of the positive termination capacitor C3 of biasing circuit 2.
Compared with prior art, the beneficial effect of technical solution of the present invention is: after introducing over-voltage breaking circuit, when adjustment is managed
The end Q1 voltage VDSGreater than the shutdown voltage of setting, after 30V, force switch pipe Q2 shutdown, avoid adjustment pipe Q1 end voltage after
It is continuous to rise, so that current constant control adjustment pipe Q1 temperature rise is controllable；In the certain situation of series LED number of chips, work as input voltage
When changing in a big way, LED lamp output power, brightness are held essentially constant, and realize Width funtion input function；Defeated
Enter in the certain situation of voltage, series LED number of chips can select in a big way；It is smaller to power on surge current, does not need
The not high thermistor element of reliability of connecting in ac input circuit.
Detailed description of the invention
Fig. 1 is the embodiment of the present invention and abstract of description figure；
Fig. 2 is the existing linear drive circuit of middle low power LED lamp；
Fig. 3 is another embodiment of the present invention；
Fig. 4 is another embodiment of the present invention；
Fig. 5 is the end storage capacitor C1 of the present invention voltage VCTheoretical waveform；
Fig. 6 is the end storage capacitor C1 of the present invention voltage VCActual waveform.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
In order to better illustrate this embodiment, the certain components of attached drawing have omission, zoom in or out, and do not represent actual product
Size；
To those skilled in the art, it is to be understood that certain known features and its explanation, which may be omitted, in attached drawing
's.
The following further describes the technical solution of the present invention with reference to the accompanying drawings and examples.
Embodiment 1
Fig. 2 is traditional middle low power LED illumination lamp circuit structure, has input protection circuit, bridge rectifier, perseverance
Flow control circuit.
Fig. 1 embodiment of the present invention and abstract of description figure, including input protection circuit, bridge rectifier, constant current control
Circuit processed, over-voltage breaking circuit.
The constant-current control circuit is by storage capacitor C1, series LED chipset, LED operation current sampling resistor RS, electricity
Stream amplifier CA, reference voltage source, adjustment pipe Q1 and biasing circuit 1 form；The over-voltage breaking circuit is by first voltage
Sample resistance R1, second voltage sample resistance R2, high-frequency filter capacitor C2, comparator CP, power switch tube Q2, biasing circuit 2,
And lightning protection device VR2 composition；Input protection circuit is made of protective tube FUSE and varistor VR1；
The storage capacitor C1 anode meets bridge rectifier BR positive output end VIN, cathode and constant-current control circuit negative terminal
GNDS is connected；Biasing circuit 1 gives current amplifier CA, reference voltage Vref1Bias supply is provided, bridge rectifier is just terminated
The positive output end V of BRIN, negative terminal meets constant-current control circuit negative terminal GNDS；Series LED chipset is just terminating bridge rectifier BR just
Output end VIN, negative terminal connect adjustment pipe Q1 drain D；The source S of the termination adjustment of current sampling resistor RS mono- pipe Q1, another termination are permanent
Flow control circuit negative terminal GNDS；The source S of current amplifier CA anti-phase input termination adjustment pipe Q1, homophase input terminate benchmark electricity
Source Vref1, the grid G of output termination adjustment pipe Q1；
The drain D of the termination adjustment of the first voltage sample resistance R1 mono- pipe Q1 of the over-voltage breaking circuit, i.e. LED series connection
The negative terminal of chipset, the inverting input terminal of another termination comparator CP；Second voltage sample resistance R2 mono- terminates comparator CP's
Inverting input terminal, another termination bridge rectifier BR negative terminal GND；High-frequency filter capacitor C2 is attempted by second voltage sample resistance R2
Both ends；The homophase input of comparator CP terminates reference power supply Vref2, the grid G of the output termination switching tube Q2 of comparator CP；
Switching tube Q2 drain D meets constant-current control circuit negative terminal GNDS, and source S meets bridge rectifier BR negative terminal GND；Biasing circuit 2 give than
Compared with device CP, reference voltage Vref2Bias supply is provided, the positive output end V of bridge rectifier BR is just being terminatedIN, it is whole that negative terminal connects bridge-type
Flow the negative terminal GND of device BR.
As an example, the power switch tube Q2 in over-voltage breaking circuit is N ditch power MOS pipe.
As an example, series LED chipset is at least 1.
As an example, the end firewire L of a termination exchange input of the input protection circuit protective tube FUSE, protective tube
Another termination bridge rectifier BR exchange incoming end, bridge rectifier BR another exchange access termination exchange input
Zero curve N-terminal；The both ends of varistor VR1 connect two exchange incoming ends of bridge rectifier BR respectively.
As an example, such as Fig. 3, it can lightning protection guarantor in parallel between the switching tube drain-source pole in the over-voltage breaking circuit
Protection element, such as varistor, discharge tube or TVS pipe；Lightning protection element in the over-voltage breaking circuit can and opened
The small capacitances that series diode and a capacity are 1 μ of μ F~2.2 F between pipe drain D and rectifier bridge negative terminal GND are closed, then will biasing
Anode of the anode reconfiguration of circuit 2 to small capacitances.Specific connection are as follows: diode D2 anode connects the drain D of switching tube Q2, and cathode connects
The anode of capacitor C3；The cathode of capacitor C3 meets the negative terminal GND of bridge rectifier BR；The positive termination capacitor C3 of biasing circuit 2 is just
Pole.
As an example, the first voltage sample resistance R1 mono- of the over-voltage breaking circuit terminates bridge rectifier such as Fig. 4
BR positive output end VIN, and the connection type of other elements remains unchanged.
In the specific implementation process, it is assumed that series LED chipset operating voltage VFIt indicates, turns off voltage V2It indicates.?
In half of alternating current period, as rectifier output voltage VIN< V2When, comparator CP exports high level, switching tube Q2 conducting, energy storage electricity
Hold C1 charging, series LED chipset shines, with the increase of instantaneous AC input voltage, the end storage capacitor C1 voltage VC?
It is constantly increasing, in VC≥VFIn the case of, series LED chipset operating currentAs rectifier output voltage VIN≥V2
When, adjust the end pipe Q1 voltage VDSGreater than the shutdown voltage of setting, comparator CP exports low level, and force switch pipe Q2 shutdown is kept away
Exempt from the end adjustment pipe Q1 voltage to continue to rise, while storage capacitor C1 discharges, and LED chip group is made to continue to shine；When exchange inputs
After instantaneous voltage drops to a certain particular value, rectifier output voltage VIN< V2, adjust the end pipe Q1 voltage VDSLess than the pass of setting
Power-off pressure, comparator CP export high level, and trigger switch pipe Q2 is connected again, and storage capacitor C1 charges once again, work as VIN< VCWhen,
Rectifier diode cut-off in bridge rectifier BR, storage capacitor C1 discharge again, make series LED chipset continuous illumination.?
In lower half of alternating current period, when instantaneous AC input voltage is greater than storage capacitor C-terminal voltage VCWhen, in bridge rectifier BR
Diode current flow, and so on.The end storage capacitor C1 voltage VCTheoretical waveform is as shown in 5 heavy line of attached drawing, VCActual waveform is for example attached
Shown in Fig. 6 heavy line.
In shutdown voltage V2, output power POIn certain situation, storage capacitor C1 capacity is reasonably selected, so that it may guarantee
During storage capacitor C1 discharges, capacitor C1 smallest end voltage VC min> VF, stablize series LED chipset operating current constant,
Obtain no stroboscopic or the slight LED luminance of stroboscopic.
In powered on moment, if instantaneous AC input voltage is greater than shutdown voltage V2, then comparator CP exports low level,
Force switch pipe Q2 cut-off, effectively inhibits and powers on surge current.
Embodiment 2
Below in the specific implementation process, it is assumed that under 220V power supply state, to improve efficiency, turn off voltage V2Generally take
(VF+ 30~40V), then voltage V2The corresponding time:
Wherein UINFor input ac voltage virtual value, f is alternating current voltage frequency.
When alternating voltage instantaneous value is greater than shutdown voltage V2, voltage V is held in switching tube Q2 shutdown, storage capacitor C electric dischargeC
T3 moment storage capacitor C-terminal voltage V is arrived in declineCDrop to V1, to avoid stroboscopic, it is clear that V1Minimum value takes VF, then storage capacitor C
Capacity.
Wherein POFor the output power of lamps and lanterns, η is driving power efficiency.
Assuming that series LED core number is 66, every chips operating voltage is 3.2V, then series LED chipset works
Voltage VF=66 × 3.2=211.2V；Turn off voltage V2Take (VF+ 35V), i.e. 246.2V, the shutdown voltage V2 corresponding timeThe end the storage capacitor C1 voltage after t3 moment discharge off
VCDrop to V1=VF, output power PO14.5W is taken, efficiency eta takes 0.92, then storage capacitor C1 capacity
Take 10 μ F of standard value.
Input voltage sample resistance R1, R2 is by shutdown voltage V2And reference voltage Vref2It determines.Obviously, when comparator CP is anti-
When mutually input leakage current is much smaller than the electric current for flowing through resistance R2, input voltage sample resistance R1, R2 ratio
The same or similar label correspond to the same or similar components；
The terms describing the positional relationship in the drawings are only for illustration, should not be understood as the limitation to this patent；
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (4)
1. a kind of high light efficiency LED illuminator linear drive circuit, it is characterised in that: including input protection circuit, bridge rectifier
Device, constant-current control circuit, over-voltage breaking circuit；
The constant-current control circuit is put by storage capacitor C1, series LED chipset, LED operation current sampling resistor RS, electric current
Big device CA, reference voltage source, adjustment pipe Q1 and biasing circuit 1 form；The over-voltage breaking circuit is sampled by first voltage
Resistance R1, second voltage sample resistance R2, high-frequency filter capacitor C2, comparator CP, power switch tube Q2, biasing circuit 2, and
Lightning protection device VR2 composition；Input protection circuit is made of protective tube FUSE and varistor VR1；
The storage capacitor C1 anode meets bridge rectifier BR positive output end VIN, cathode and constant-current control circuit negative terminal GNDS phase
Even；Biasing circuit 1 gives current amplifier CA, reference voltage Vref1Bias supply is provided, is just terminating bridge rectifier BR just
Output end VIN, negative terminal meets constant-current control circuit negative terminal GNDS；Series LED chipset is just terminating the positive output end of bridge rectifier BR
VIN, negative terminal connect adjustment pipe Q1 drain D；The source S of the termination adjustment of current sampling resistor RS mono- pipe Q1, another termination current constant control
Circuit negative terminal GNDS；The source S of current amplifier CA anti-phase input termination adjustment pipe Q1, homophase input terminate reference power supply
Vref1, the grid G of output termination adjustment pipe Q1；
The drain D of the termination adjustment of the first voltage sample resistance R1 mono- pipe Q1 of the over-voltage breaking circuit, i.e. LED series chip
The negative terminal of group, the inverting input terminal of another termination comparator CP；The reverse phase of the termination of second voltage sample resistance R2 mono- comparator CP
Input terminal, another termination bridge rectifier BR negative terminal GND；High-frequency filter capacitor C2 is attempted by the two of second voltage sample resistance R2
End；The homophase input of comparator CP terminates reference power supply Vref2, the grid G of the output termination switching tube Q2 of comparator CP；Switch
Pipe Q2 drain D meets constant-current control circuit negative terminal GNDS, and source S meets bridge rectifier BR negative terminal GND；Biasing circuit 2 gives comparator
CP, reference voltage Vref2Bias supply is provided, the positive output end V of bridge rectifier BR is just being terminatedIN, negative terminal connects bridge rectifier
The negative terminal GND of BR.
2. a kind of high light efficiency LED illuminator linear drive circuit according to claim 1, it is characterised in that: described
Power switch tube Q2 in over-voltage breaking circuit is N ditch power MOS pipe.
3. a kind of high light efficiency LED illuminator linear drive circuit according to claim 1, it is characterised in that: described
Series LED chipset is at least 1.
4. a kind of high light efficiency LED illuminator linear drive circuit according to claim 1, it is characterised in that: described
The end firewire L of a termination exchange input of input protection circuit protective tube FUSE, another termination bridge rectifier BR of protective tube
Exchange incoming end, bridge rectifier BR another exchange access termination exchange input zero curve N-terminal；Varistor VR1's
Both ends connect two exchange incoming ends of bridge rectifier BR respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811014702.XA CN108966430B (en) | 2018-08-31 | 2018-08-31 | Linear driving circuit of LED lighting lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811014702.XA CN108966430B (en) | 2018-08-31 | 2018-08-31 | Linear driving circuit of LED lighting lamp |
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| CN108966430B CN108966430B (en) | 2020-06-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110493914A (en) * | 2019-08-14 | 2019-11-22 | 广州竟合电子科技有限公司 | A kind of car light constant current driving device and its manufacturing method |
| US10609773B1 (en) | 2019-03-07 | 2020-03-31 | Wuxi ORG Microelectronics Co., Ltd | Circuit for LED illumination driving current linear adjustment and dimming control |
| CN112105124A (en) * | 2020-10-19 | 2020-12-18 | 美芯晟科技（北京）有限公司 | Loop type low-power constant current control circuit and method |
| WO2021128743A1 (en) * | 2019-12-23 | 2021-07-01 | 华润矽威科技（上海）有限公司 | Led constant current drive system and method |
| WO2022142857A1 (en) * | 2020-12-30 | 2022-07-07 | 华润微集成电路(无锡)有限公司 | Led driving system and closed-loop control method for led driving |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10609773B1 (en) | 2019-03-07 | 2020-03-31 | Wuxi ORG Microelectronics Co., Ltd | Circuit for LED illumination driving current linear adjustment and dimming control |
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| CN108966430B (en) | 2020-06-30 |
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Effective date of registration: 20220701 Address after: 523460 No.3, xiaotiantou 1st Road, Xinsi village, Hengli Town, Dongguan City, Guangdong Province Patentee after: LETARON ELECTRONIC CO.,LTD. Address before: 510006 Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong 729 Patentee before: GUANGDONG University OF TECHNOLOGY |
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| CP03 | Change of name, title or address |
Address after: No. 253, Hengli Junma Road, Hengli Town, Dongguan, Guangdong 523460 Patentee after: Guangdong Qingzhou Photoelectric Technology Co.,Ltd. Address before: 523460 No.3, xiaotiantou 1st Road, Xinsi village, Hengli Town, Dongguan City, Guangdong Province Patentee before: LETARON ELECTRONIC CO.,LTD. |