CN107172751B - A kind of adjustable LED control circuit of voltage and its control method - Google Patents
A kind of adjustable LED control circuit of voltage and its control method Download PDFInfo
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- CN107172751B CN107172751B CN201710436090.2A CN201710436090A CN107172751B CN 107172751 B CN107172751 B CN 107172751B CN 201710436090 A CN201710436090 A CN 201710436090A CN 107172751 B CN107172751 B CN 107172751B
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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]
- H05B45/30—Driver circuits
- H05B45/37—Converter 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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- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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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]
Abstract
A kind of adjustable LED control circuit of voltage of the present invention and its control method belong to LED control fields, especially a kind of LED control circuit for capableing of voltage automatic adjustment.Including bridge rectifier, constant current supply control circuit, adjustable booster circuit and excess voltage protection；Bridge rectifier is arranged in the front end that the adjustable LED control circuit of voltage is connected with power supply, for ac voltage rectifier to be obtained direct current.The circuit that the present invention controls is more energy efficient compared with present LED bulb；It is cost-effective；Using constant current power supply mode, scintillation can be eliminated, protect eyes are conducive to；Equipped with excess voltage protection, safety accident is avoided the occurrence of, is eliminated safe hidden trouble；The total pressure head of LED lamp bead can be automatically adjusted；If there is lamp bead short circuit, the normal use of entire light bulb can not be influenced.
Description
Technical field
A kind of adjustable LED control circuit of voltage of the present invention and its control method belong to LED control fields, especially a kind of
It is capable of the LED control circuit of voltage automatic adjustment.
Background technology
LED light is cheap as one kind, and luminous efficiency is high, the strong light source of stability, by the generally use of people, but
Thing followed control problem becomes the theme that studies for a long period of time of people, the problem of specifically how controlling to adjust circuit voltage.
A kind of load control circuit existing at present and device（China application CN104049559）Disclose a kind of load control
Then circuit and device processed pass through boosting by the rectification filtering module direct current required by load is converted to after alternating current impurity elimination
Module boosts the direct current that rectification filtering module exports, and reduces the loss of electric energy in circuit, and electricity is converted by DC-DC
Voltage after boosting is converted to the voltage needed for load by road, finally by feedback regulation module according to the input voltage control of load
The voltage of output, which is adjusted, in DC-DC conversion circuit processed makes the input voltage of load maintain to stablize.But its existing deficiency is：
1）Output voltage is fixed, and this can change the brightness for leading to LED；2）How the invention is undisclosed controls LED current.
Invention content
The purpose of the present invention is place provides a kind of adjustable LED control circuit of voltage and its controlling party against the above deficiency
Method can effectively improve power supply conversion efficiency, using electricity wisely, and automatically adjust the total pressure head of LED lamp bead, extend making for LED light
Use the service life.
The present invention takes following technical scheme to realize：
A kind of adjustable LED control circuit of voltage, including bridge rectifier, constant current supply control circuit, adjustable boosting
Circuit and excess voltage protection；Bridge rectifier be arranged the adjustable LED control circuit of voltage be connected with power supply most before
End, for ac voltage rectifier to be obtained direct current；
Constant current supply control circuit includes first comparator CMP1, the first metal-oxide-semiconductor M1 and variable resistance R1, first comparator
The output end of CMP1 is connected with the grid of the first metal-oxide-semiconductor M1；The inverting input of first comparator CMP1 and the first metal-oxide-semiconductor M1's
Source electrode is in series with variable resistance R1 again after being connected；First comparator CMP1 is used for comparing the benchmark being connected with its in-phase input end
B point current potential VB of the source terminal of voltage REF1 current potentials and the first metal-oxide-semiconductor M1, and VB voltage values are fixed, and with REF1 voltage phases
Together, it is generally set to 0.1V~0.3V；The resistance value of regulation resistance R1, to control the electric current of lamp bead, this electric current is not by power supply electricity
The influence of pressure, temperature and LED lamp bead number；
Adjustable booster circuit includes the second comparator CMP2, pulse width modulation circuit PWM, the second metal-oxide-semiconductor M2, inductance L1
It is connected with pulse width regulating circuit PWM with the output end of high-voltage diode D1, the second comparator CMP2；Second comparator CMP2
Output end be connected with the grid of the second metal-oxide-semiconductor M2；The drain electrode of second metal-oxide-semiconductor M2 is connected with high-voltage diode D1；Second compares
Device CMP2 is used for comparing the A points of the reference voltage REF2 current potentials being connected with its in-phase input end and the drain electrode end of the first metal-oxide-semiconductor M1
Current potential VA controls the 2nd MOS using the output control pulse width modulation circuit PWM after relatively, pulse width modulation circuit PWM
Pipe M2；
Excess voltage protection is by third comparator CMP3, the first metal-oxide-semiconductor M1, pulse width modulation circuit PWM and second
Metal-oxide-semiconductor M2 compositions, the output of third comparator CMP3 terminate to the grid of the first metal-oxide-semiconductor M1, while the output of comparator CMP3
The grid of the first metal-oxide-semiconductor M1 is terminated to, and is connect with pulse width modulation circuit PWM；Third comparator CMP3 be used for compare with
The A point current potential VA of the drain electrode end of the connected reference voltage REF3 current potentials of its in-phase input end and the first metal-oxide-semiconductor M1, after relatively
Output control the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 closing；When supply voltage is extremely higher or LED lamp bead short circuit
When number is excessive, when A point voltages VA being caused to be more than reference voltage REF3, third comparator CMP3 exports low-potential signal, this letter
Number the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 will be closed, and to turn off the electric current of LED lamp bead, protect LED bulb, avoid the occurrence of peace
Full accident.
Household 220V AC powers obtain the DC power supply of 300V or so by bridge rectifier.LED lamp bead is at normal temperatures
Ignition voltage is about 2V~3V.
DC voltage after rectification is raised to certain voltage and powered to concatenated LED lamp bead by circuit of the present invention.Due to household
220V AC powers usually have ± 20% amplitude of variation, and at different temperatures, ignition voltage is also different for LED lamp bead, boosting
1.2~2 times of multiple can meet general domestic applications.
The voltage of reference voltage REF1 is about 0.1V~0.2V, usual reference voltage REF1, reference voltage REF2 and benchmark
The current potential of voltage REF3 is higher, and 2~3 times of voltage REF2 current potentials on the basis of the voltage of reference voltage REF3.
A kind of control method of the adjustable LED control circuit of voltage, includes the following steps：
1）It is by bridge rectifier that alternating current is whole for DC voltage VF after household 220V power supplys are powered；
2）The input voltage VC current potentials of LED lamp bead are increased to LED lamp bead work by inductance L1 and high-voltage diode D1
Voltage；
3）The A point current potential VA voltages of the drain electrode end of first metal-oxide-semiconductor M1 are less than reference voltage REF2, starting impulse width modulated
Circuit PWM promotes the current potential of the VC of LED lamp bead by the second metal-oxide-semiconductor M2, inductance L1 and high-voltage diode D1；
4）After the current potential of the input voltage VC of LED lamp bead is more than the minimum voltage of LED lamp bead work（It is single as mentioned before
LED conducting voltage is 2V~3V, this voltage is 2V*LED total numbers）, LED lamp bead begins with electric current and flows through, this electric current is in electricity
Resistance R1 on form pressure drop, the pressure drop be less than 0.1V, LED lamp bead electric current with the current potential of the input voltage VC of LED lamp bead raising
And it increases；When the input voltage VC current potentials of LED lamp bead continue to increase, until the voltage on variable resistance R1 is equal to reference voltage
The electric current of REF1, LED lamp bead will be constant, no longer increased with the raising of the VC of LED lamp bead；The leakage of first metal-oxide-semiconductor M1 at this time
Extreme A point current potentials VA has not exceeded the current potential of reference voltage REF2, and the input voltage VC voltages of LED lamp bead will also be after of continuing rising
Height, until the A points current potential VA voltages of the drain electrode end of the first metal-oxide-semiconductor M1 are more than pulse width modulation circuit after reference voltage REF2
PWM will close the second metal-oxide-semiconductor M2, and the input voltage VC voltages of LED lamp bead will be increased no longer；
5）LED lamp bead electric current is provided by capacitance C1 connected in parallel, therefore the input voltage VC of LED lamp bead will gradually become
It is low, after the A point current potential VA voltages of the drain electrode end of the first metal-oxide-semiconductor M1 are less than reference voltage REF2, pulse width modulation circuit
PWM will be reopened, and be controlled the second metal-oxide-semiconductor M2, will be promoted LED by inductance L1, the second metal-oxide-semiconductor M2 and high-voltage diode D1
The voltage of the VC of lamp bead is closed until the A point current potentials VA of the drain electrode end of the first metal-oxide-semiconductor M1 is more than the current potential of reference voltage REF2
Second metal-oxide-semiconductor M2, the input voltage VC of LED lamp bead will stop rising；So circulation is gone down, until the closing of 220V power supplys, or
It is abnormal high that the appearance of abnormal or 220V power supplys occurs in LED lamp bead.
In step 5）In, if AC power occur it is abnormal, after bridge rectifier, supply voltage VF current potentials and
The input voltage VC voltages of LED lamp bead are far more than LED lamp bead operating voltage, the A point current potentials VA of the drain electrode end of the first metal-oxide-semiconductor M1
Higher than the voltage of reference voltage REF3, comparator CMP1 exports low voltage signal, will close the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor
M2 effectively avoids the occurrence of safety accident to cut off the electric current in LED lamp bead.
Advantages of the present invention：
1, more energy efficient compared with present LED bulb；
Present LED bulb is mainly powered by way of decompression, and Amplitude of Hypotensive is larger；And by the way of boosting,
The normal alternating current of the raised Amplitude Ratio of its voltage is a little high, can improve power supply conversion efficiency, using electricity wisely；
It 2, can be cost-effective；
Booster type LED bulb only needs series connection to can reach larger power, does not need parallel connection, therefore to LED lamp bead
Coherence request is not high, can be cost-effective；
3, this method uses constant current power supply mode, can eliminate scintillation, be conducive to protect eyes；
4, this method is equipped with excess voltage protection；
When the number that supply voltage is extremely higher or LED lamp bead is short-circuit is excessive, LED lamp bead electric current, protection will be closed
LED bulb avoids the occurrence of safety accident, eliminates safe hidden trouble；
5, the total pressure head of LED lamp bead can be automatically adjusted；
LED lamp bead is more sensitive to temperature, and with the raising of temperature, the voltage at the both ends LED can reduce, and control circuit can drop
The overall presure drop of low LED lamp bead；
6, in the method, if there is lamp bead short circuit, the normal use of entire light bulb can not be influenced.
Description of the drawings
Below with reference to attached drawing, the invention will be further described：
Fig. 1 is the LED control circuit schematic diagram of the present invention；
Fig. 2 is that the LED current potentials of circuit of the present invention and frequency adjust oscillogram.
Specific implementation mode
With reference to attached drawing 1~2, the adjustable LED control circuit of voltage of the present invention, including bridge rectifier, Constant Electric Current flow control
Circuit, adjustable booster circuit and excess voltage protection processed；Bridge rectifier setting the adjustable LED control circuit of voltage with
The connected front end of power supply, for ac voltage rectifier to be obtained direct current；
Constant current supply control circuit includes first comparator CMP1, the first metal-oxide-semiconductor M1 and variable resistance R1, first comparator
The output end of CMP1 is connected with the grid of the first metal-oxide-semiconductor M1；The inverting input of first comparator CMP1 and the first metal-oxide-semiconductor M1's
Source electrode is in series with variable resistance R1 again after being connected；First comparator CMP1 is used for comparing the benchmark being connected with its in-phase input end
B point current potential VB of the source terminal of voltage REF1 current potentials and the first metal-oxide-semiconductor M1, and VB voltage values are fixed, and with REF1 voltage phases
Together, it is generally set to 0.1V~0.3V；The resistance value of regulation resistance R1, to control the electric current of lamp bead, this electric current is not by power supply electricity
The influence of pressure, temperature and LED lamp bead number；
Adjustable booster circuit includes the second comparator CMP2, pulse width modulation circuit PWM, the second metal-oxide-semiconductor M2, inductance L1
It is connected with pulse width regulating circuit PWM with the output end of high-voltage diode D1, the second comparator CMP2；Second comparator CMP2
Output end be connected with the grid of the second metal-oxide-semiconductor M2；The drain electrode of second metal-oxide-semiconductor M2 is connected with high-voltage diode D1；Second compares
Device CMP2 is used for comparing the A points of the reference voltage REF2 current potentials being connected with its in-phase input end and the drain electrode end of the first metal-oxide-semiconductor M1
Current potential VA controls the 2nd MOS using the output control pulse width modulation circuit PWM after relatively, pulse width modulation circuit PWM
Pipe M2；
Excess voltage protection is by third comparator CMP3, the first metal-oxide-semiconductor M1, pulse width modulation circuit PWM and second
Metal-oxide-semiconductor M2 compositions, the output of third comparator CMP3 terminate to the grid of the first metal-oxide-semiconductor M1, while the output of comparator CMP3
The grid of the first metal-oxide-semiconductor M1 is terminated to, and is connect with pulse width modulation circuit PWM；Third comparator CMP3 be used for compare with
The A point current potential VA of the drain electrode end of the connected reference voltage REF3 current potentials of its in-phase input end and the first metal-oxide-semiconductor M1, after relatively
Output control the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 closing；When supply voltage is extremely higher or LED lamp bead short circuit
When number is excessive, when A point voltages VA being caused to be more than reference voltage REF3, third comparator CMP3 exports low-potential signal, this letter
Number the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 will be closed, and to turn off the electric current of LED lamp bead, protect LED bulb, avoid the occurrence of peace
Full accident.
Household 220V AC powers obtain the DC power supply of 300V or so by bridge rectifier.LED lamp bead is at normal temperatures
Ignition voltage is about 2V~3V.
The principle of adjustable booster circuit is as shown in Fig. 2, when the A point current potentials of the drain electrode end of the first metal-oxide-semiconductor M1 are less than benchmark
When voltage REF2, pulse width modulation circuit PWM exports a high potential and controls signal VD, this control signal opens the second metal-oxide-semiconductor
M2 charges to inductance L1 to drag down E point current potentials, this charging time is T1, and the T1 times terminate, pulse width modulation circuit PWM
Output signal VD is converted to low potential from high potential, and the second metal-oxide-semiconductor M2 is closed, and the electric current of inductance L1 will pass through high-voltage diode stream
It to the input terminal of LED, while also flowing on the capacitance C1 in parallel with LED, to improve the input voltage VC, the first MOS of LED
The A point current potentials VA of the drain electrode end of pipe M1 can also rise；When the A point current potentials VA of the drain electrode end of the first metal-oxide-semiconductor M1 is higher than reference voltage
When REF2, PWM output current potentials remain low potential, until the A point current potentials VA of the drain electrode end of the first metal-oxide-semiconductor M1 is less than reference voltage
REF2。
The time of pulse width modulation circuit PWM output high potential signals is set time T1, the time of low-potential signal
Time for T2, T2 is adjustable and related to the voltage of supply voltage VF, LED lamp bead, as supply voltage VF and PUMP voltages VC ratios
When value is smaller, the T2 times are shorter；When supply voltage VF is larger with PUMP voltage VC ratios, the T2 times are longer.
PUMP voltages VC=n*VLED+VA, n are the number of LED lamp bead, and VLED is the voltage of LED lamp bead.Typical temperature is solid
After fixed, VLED voltages are also fixed；When the current potential VF of power supply F points is extremely higher, it will lead to the drain electrode end of the first metal-oxide-semiconductor M1
A point current potentials VA is higher；When the number of LED lamp bead short circuit is on the high side, the A point current potentials VA of the drain electrode end of the first metal-oxide-semiconductor M1 also will be inclined
It is high.
The circuit course of work：Assuming that the normally voltage of single LED lamp bead is 3V, this string of LED lamp bead numbers are 150
, reference voltage REF1 is 0.1V, and reference voltage REF2 is 5V, and reference voltage REF3 is 10V.After household 220V power supplys are powered,
By bridge rectifier by alternating current it is whole be DC voltage VF, this voltage is about 300V, while passing through inductance L1, two pole of high pressure
The VC current potentials of LED lamp bead are increased to 300V or so by pipe D1.Since LED lamp bead normal luminous voltage is about 450V, VA electricity
Pressure is much smaller than reference voltage REF2, by starting impulse width modulation circuit PWM, by metal-oxide-semiconductor M2, inductance L1 and high-voltage diode
D1 promotes the current potential of VC.After VC current potentials are more than certain voltage, LED lamp bead begins with electric current and flows through, this electric current can be in resistance R1
Upper formation pressure drop, the pressure drop are less than 0.1V, and LED lamp bead electric current can be increased with the raising of VC.After VC voltages are more than 450V,
Voltage on R1 is fixed to 0.1V, and the electric current of LED lamp bead will be constant, is no longer increased with the raising of VC.Still due to VA current potentials
It is less than 5V, VC voltages will continue to increase, and after more than 455V, VA voltages are more than pulse width modulation after reference voltage REF2
Circuit PWM will close metal-oxide-semiconductor M2, and VC voltages will be increased no longer.LED lamp bead electric current is provided by capacitance C1 connected in parallel, therefore
VC will gradually be lower, and when VC is less than 455V, after VA voltages are less than reference voltage REF2, PWM will be opened from new, control metal-oxide-semiconductor M2,
The voltage that VC will be promoted by L1, M2 and D1, until VC current potentials are more than 455V, VA is more than 5V, closes M2, VC will be in stopping
It rises, so circulation is gone down, until 220V power supplys are closed, exception occurs in either LED lamp bead or the appearance of 220V power supplys is abnormal high.
Assuming that abnormal, up to 330V occurs in AC power, after bridge rectifier, VF current potentials are more than 460V, VC electricity
For pressure also above 460V, VA voltages are more than 10V, and VA is higher than the 10V voltages of reference voltage REF3, comparator CMP1 output low-voltage letters
Number, MOS M1 and MOS M2 will be closed and effectively avoid the occurrence of safety accident to cut off the electric current in LED lamp bead.
Claims (4)
1. a kind of adjustable LED control circuit of voltage, it is characterised in that：Including bridge rectifier, constant current supply control circuit,
Adjustable booster circuit and excess voltage protection；Bridge rectifier is arranged in the adjustable LED control circuit of voltage and power supply phase
Front end even, for ac voltage rectifier to be obtained direct current；
Constant current supply control circuit includes first comparator CMP1, the first metal-oxide-semiconductor M1 and variable resistance R1, first comparator CMP1
Output end be connected with the grid of the first metal-oxide-semiconductor M1；The source electrode of the inverting input of first comparator CMP1 and the first metal-oxide-semiconductor M1
It is in series again with variable resistance R1 after being connected；
Adjustable booster circuit includes the second comparator CMP2, pulse width modulation circuit PWM, the second metal-oxide-semiconductor M2, inductance L1 and height
Diode D1, the output end of the second comparator CMP2 is pressed to be connected with pulse width regulating circuit PWM；Second comparator CMP2's is defeated
Outlet is connected with the grid of the second metal-oxide-semiconductor M2；The drain electrode of second metal-oxide-semiconductor M2 is connected with high-voltage diode D1；
Excess voltage protection is by third comparator CMP3, the first metal-oxide-semiconductor M1, pulse width modulation circuit PWM and the second metal-oxide-semiconductor
M2 is formed, and the output of third comparator CMP3 terminates to the grid of the first metal-oxide-semiconductor M1, while the output of comparator CMP3 terminates to
The grid of first metal-oxide-semiconductor M1, and connect with pulse width modulation circuit PWM.
2. the adjustable LED control circuit of voltage according to claim 1, it is characterised in that：Household 220V AC powers pass through
The DC power supply of 300V is obtained after bridge type rectifier circuit rectifies.
3. the control method of the adjustable LED control circuit of voltage described in claim 1, which is characterized in that include the following steps：
1）It is by bridge rectifier that alternating current is whole for DC voltage VF after household 220V power supplys are powered；
2）The input voltage VC current potentials of LED lamp bead are increased to LED lamp bead operating voltage by inductance L1 and high-voltage diode D1；
3）The A point current potential VA voltages of the drain electrode end of first metal-oxide-semiconductor M1 are less than reference voltage REF2, starting impulse width modulation circuit
PWM promotes the current potential of the VC of LED lamp bead by the second metal-oxide-semiconductor M2, inductance L1 and high-voltage diode D1；
4）After the current potential of the input voltage VC of LED lamp bead is more than the minimum voltage of LED lamp bead work, LED lamp bead begins with electricity
Stream flows through, this electric current forms pressure drop on resistance R1, which is less than 0.1V, and LED lamp bead electric current is electric with the input of LED lamp bead
It presses the raising of the current potential of VC and increases；When the input voltage VC current potentials of LED lamp bead continue to increase, the electricity on variable resistance R1
Pressure is equal to reference voltage REF1, and the electric current of LED lamp bead will be constant, is no longer increased with the raising of the VC of LED lamp bead；At this time
The A point current potentials VA of the drain electrode end of one metal-oxide-semiconductor M1 has not exceeded the current potential of reference voltage REF2, the input voltage VC electricity of LED lamp bead
Pressure will also continue to increase, until the A points current potential VA voltages of the drain electrode end of the first metal-oxide-semiconductor M1 are more than pulse after reference voltage REF2
Width modulation circuit PWM will close the second metal-oxide-semiconductor M2, and the input voltage VC voltages of LED lamp bead will be increased no longer；
5）LED lamp bead electric current is provided by capacitance C1 connected in parallel, therefore the input voltage VC of LED lamp bead will gradually be lower, directly
To the drain electrode end of the first metal-oxide-semiconductor M1 A point current potential VA voltages be less than reference voltage REF2 after, pulse width modulation circuit PWM will
It reopens, controls the second metal-oxide-semiconductor M2, LED lamp bead will be promoted by inductance L1, the second metal-oxide-semiconductor M2 and high-voltage diode D1
The voltage of VC close second until the A point current potentials VA of the drain electrode end of the first metal-oxide-semiconductor M1 is more than the current potential of reference voltage REF2
Metal-oxide-semiconductor M2, the input voltage VC of LED lamp bead will stop rising；So circulation is gone down, until 220V power supplys are closed or LED light
It is abnormal high that the appearance of abnormal or 220V power supplys occurs in pearl.
4. the control method of the adjustable LED control circuit of voltage according to claim 3, it is characterised in that：In step 5）
In, if there is exception, after bridge rectifier, the input voltage of supply voltage VF current potentials and LED lamp bead in AC power
For VC voltages far more than LED lamp bead operating voltage, the A point current potentials VA of the drain electrode end of the first metal-oxide-semiconductor M1 is higher than reference voltage REF3
Voltage, comparator CMP1 exports low voltage signal, the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 will be closed, to cut off LED
Electric current in lamp bead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710436090.2A CN107172751B (en) | 2017-06-12 | 2017-06-12 | A kind of adjustable LED control circuit of voltage and its control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710436090.2A CN107172751B (en) | 2017-06-12 | 2017-06-12 | A kind of adjustable LED control circuit of voltage and its control method |
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| Publication Number | Publication Date |
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| CN107172751A CN107172751A (en) | 2017-09-15 |
| CN107172751B true CN107172751B (en) | 2018-08-10 |
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| CN109032234B (en) * | 2018-10-08 | 2020-08-18 | 北方电子研究院安徽有限公司 | Constant current source device for limiting voltage threshold |
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| US20120326618A1 (en) * | 2011-06-24 | 2012-12-27 | National Semiconductor Corporation | Harmonic ripple-current light emitting diode (led) driver circuitry and method |
| US8698407B1 (en) * | 2011-11-14 | 2014-04-15 | Technical Consumer Products, Inc. | Highly integrated non-inductive LED driver |
| CN102655700B (en) * | 2012-02-21 | 2016-08-03 | 陈龙 | Based on continuous current detection and the control method of the constant-current LED driver on floating ground |
| CN203279303U (en) * | 2013-05-29 | 2013-11-06 | 广州凯盛电子科技有限公司 | A large-power LED driver and a boost converter protection circuit thereof |
| CN104049559A (en) * | 2014-06-09 | 2014-09-17 | 陆俊 | Load control circuit and device |
| CN204119589U (en) * | 2014-07-29 | 2015-01-21 | 欧司朗股份有限公司 | Simulation light adjusting and controlling device |
| CN206993457U (en) * | 2017-06-12 | 2018-02-09 | 无锡职业技术学院 | A kind of adjustable LED control circuit of voltage |
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