CN206993457U - A kind of adjustable LED control circuit of voltage - Google Patents
A kind of adjustable LED control circuit of voltage Download PDFInfo
- Publication number
- CN206993457U CN206993457U CN201720672476.9U CN201720672476U CN206993457U CN 206993457 U CN206993457 U CN 206993457U CN 201720672476 U CN201720672476 U CN 201720672476U CN 206993457 U CN206993457 U CN 206993457U
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- voltage
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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
A kind of adjustable LED control circuit of voltage of the utility model belongs to LED control fields, it is particularly a kind of being capable of the LED control circuit that automatically adjusts of voltage.Including bridge rectifier, constant current supply control circuit, adjustable booster circuit and excess voltage protection；Bridge rectifier is arranged on the front end that the adjustable LED control circuit of voltage is connected with power supply, for ac voltage rectifier to be obtained into direct current.The circuit of the utility model control is more energy efficient compared with present LED bulb；It is cost-effective；Using constant current power supply mode, scintillation can be eliminated, is advantageous to protect eyes；Provided with excess voltage protection, security incident is avoided the occurrence of, is eliminated safe hidden trouble；The total pressure head of LED lamp bead can be automatically adjusted；If lamp bead is short-circuit, the normal use of whole bulb can not be influenceed.
Description
Technical field
A kind of adjustable LED control circuit of voltage of the utility model belongs to LED control fields, particularly one kind being capable of voltage
The LED control circuit automatically adjusted.
Background technology
LED 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 turns into the theme that studies for a long period of time of people, the problem of specifically how controlling to adjust circuit voltage.
Current existing a kind of load control circuit and device（China application CN104049559）Disclose a kind of load control
Circuit and device processed, by the rectification filtering module direct current required by load is converted to after civil power impurity elimination, then pass through boosting
Module is boosted the direct current that rectification filtering module exports, and reduces the loss of electric energy in circuit, and electricity is converted by DC-DC
Road is by the voltage that the voltage conversion after boosting is needed for load, the input voltage control finally by feedback regulation module according to load
The voltage of output is adjusted DC-DC conversion circuit processed makes the input voltage of load remain stable.But its existing deficiency is：
1）Output voltage is fixed, and this can change the brightness for causing LED；2）How the utility model not publicly controls LED current.
Utility model content
The purpose of this utility model is to provide a kind of adjustable LED control circuit of voltage for above-mentioned weak point, can be had
Effect improves power supply conversion efficiency, using electricity wisely, and automatically adjusts the total pressure head of LED lamp bead, extends the service life of LED.
The utility model 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 on that the adjustable LED control circuit of voltage is connected with power supply most before
End, for ac voltage rectifier to be obtained into direct current；
Constant current supply control circuit includes first comparator CMP1, the first metal-oxide-semiconductor M1 and variable resistor R1, first comparator
CMP1 output end is connected with the first metal-oxide-semiconductor M1 grid；First comparator CMP1 inverting input and the first metal-oxide-semiconductor M1's
Source electrode is in series with variable resistor 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 voltage REF1 current potentials and the first metal-oxide-semiconductor M1 source terminal, and VB magnitudes of voltage are fixed, and with REF1 voltage phases
Together, it is generally set to 0.1V~0.3V；
Regulation resistance R1 resistance, so as to control the electric current of lamp bead, this electric current is not by supply voltage, temperature and LED lamp bead
The influence of number；
Adjustable booster circuit includes the second comparator CMP2, pulse width modulation circuit PWM, the second metal-oxide-semiconductor M2, inductance L1
With high-voltage diode D1, the second comparator CMP2 output end is connected with pulse width regulating circuit PWM；
Second comparator CMP2 output end is connected with the second metal-oxide-semiconductor M2 grid；
Second metal-oxide-semiconductor M2 drain electrode is connected with high-voltage diode D1；Second comparator CMP2 is used for comparing with it with mutually defeated
Enter the A point current potential VA of the connected reference voltage REF2 current potentials in end and the first metal-oxide-semiconductor M1 drain electrode end, utilize the result control after relatively
Pulse width modulation circuit PWM processed, pulse width modulation circuit PWM control the second metal-oxide-semiconductor M2；
Excess voltage protection is by the 3rd comparator CMP3, the first metal-oxide-semiconductor M1, pulse width modulation circuit PWM and second
Metal-oxide-semiconductor M2 is formed, and the 3rd comparator CMP3 output terminates to the first metal-oxide-semiconductor M1 grid, while comparator CMP3 output
The first metal-oxide-semiconductor M1 grid is terminated to, and is connected with pulse width modulation circuit PWM；
3rd comparator CMP3 is used for comparing the reference voltage REF3 current potentials and the first metal-oxide-semiconductor being connected with its in-phase input end
The A point current potential VA of M1 drain electrode end, utilize the closing of output control the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 after relatively；
When supply voltage is extremely higher, or LED lamp bead short circuit number it is excessive when, cause A point voltages VA to exceed benchmark
During voltage REF3, the 3rd comparator CMP3 output low-potential signals, this signal will close the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2,
So as to turn off the electric current of LED lamp bead, LED bulb is protected, avoids the occurrence of security incident.
Family expenses 220V AC powers obtain 300V or so dc source 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 the LED lamp bead of series connection by the utility model circuit.Due to
Family expenses 220V AC powers generally have ± 20% amplitude of variation, and at different temperatures, its ignition voltage is also different for LED lamp bead,
1.2~2 times of multiple of boosting can meet general domestic. applications.
Reference voltage REF1 voltage is about 0.1V~0.2V, usual reference voltage REF1, reference voltage REF2 and benchmark
Voltage REF3 current potential is higher, and 2~3 times of voltage REF2 current potentials on the basis of reference voltage REF3 voltage.
A kind of control method of the adjustable LED control circuit of voltage, comprises the following steps：
1）Family expenses 220V power supplys be powered after, by bridge rectifier by alternating current it is whole be DC voltage VF；
2）The input voltage VC current potentials of LED lamp bead are brought up into LED lamp bead by inductance L1 and high-voltage diode D1 to work
Voltage；
3）The A point current potential VA voltages of first metal-oxide-semiconductor M1 drain electrode end are less than reference voltage REF2, starting impulse width modulated
Circuit PWM, the VC of LED lamp bead current potential is lifted by the second metal-oxide-semiconductor M2, inductance L1 and high-voltage diode D1；
4）After the input voltage VC of LED lamp bead current potential exceedes the minimum voltage of LED lamp bead work（It is single as mentioned before
LEDs conducting voltage is 2V~3V, and this voltage is 2V*LED total numbers）, LED lamp bead begins with electric current and flows through, and this electric current is in electricity
Pressure drop is formed on resistance R1, the pressure drop is less than 0.1V, and LED lamp bead electric current is with the rise of the input voltage VC of LED lamp bead current potential
And raise；When the input voltage VC current potentials of LED lamp bead continue to raise, until the voltage on variable resistor R1 is equal to reference voltage
REF1, the electric current of LED lamp bead will be constant, is no longer raised with the VC of LED lamp bead rise；Now the first metal-oxide-semiconductor M1 leakage
Extreme A point current potentials VA has not exceeded reference voltage REF2 current potential, and the input voltage VC voltages of LED lamp bead will also continue to rise
Height, after the A point current potential VA voltages of the first metal-oxide-semiconductor M1 drain electrode end exceed reference voltage REF2, pulse width modulation circuit
PWM will close the second metal-oxide-semiconductor M2, and the input voltage VC voltages of LED lamp bead will be raised no longer；
5）LED lamp bead electric current is provided by electric capacity 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 first metal-oxide-semiconductor M1 drain electrode end 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 lifted LED by inductance L1, the second metal-oxide-semiconductor M2 and high-voltage diode D1
The VC of lamp bead voltage, until the A point current potentials VA of the first metal-oxide-semiconductor M1 drain electrode end exceedes reference voltage REF2 current potential, closing
Second metal-oxide-semiconductor M2, the input voltage VC of LED lamp bead will stop rising；So circulation is gone down, until 220V power-offs, or
LED lamp bead appearance is abnormal, or the appearance of 220V power supplys is abnormal high.
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 exceed well over LED lamp bead operating voltage, the A point current potentials VA of the first metal-oxide-semiconductor M1 drain electrode end
Higher than reference voltage REF3 voltage, comparator CMP1 output low voltage signals, the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor will be closed
M2, so as to cut off the electric current in LED lamp bead, effectively avoid the occurrence of security incident.
The advantages of the utility model：
1st, it is more energy efficient compared with present LED bulb；
Present LED bulb is mainly powered by way of decompression, and its Amplitude of Hypotensive is larger；And by the way of boosting,
The normal civil power of the elevated Amplitude Ratio of its voltage is a little high, can improve power supply conversion efficiency, using electricity wisely；
2nd, can be with cost-effective；
Booster type LED bulb only needs series connection to can reach larger power, it is not necessary to and it is in parallel, therefore to LED lamp bead
Coherence request is not high, can be with cost-effective；
3rd, this method uses constant current power supply mode, can eliminate scintillation, be advantageous to protect eyes；
4th, this method is provided 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, security incident is avoided the occurrence of, eliminated safe hidden trouble；
5th, the total pressure head of LED lamp bead can be automatically adjusted；
LED lamp bead is more sensitive to temperature, and with the rise of temperature, the voltage at LED both ends can reduce, and control circuit can drop
The overall presure drop of low LED lamp bead；
6th, in the method, if lamp bead is short-circuit, the normal use of whole bulb can not be influenceed.
Brief description of the drawings
Below with reference to accompanying drawing, the utility model is described in further detail：
Fig. 1 is LED control circuit schematic diagram of the present utility model；
Fig. 2 is the LED current potentials and frequency regulation oscillogram of the utility model circuit.
Embodiment
Referring to the drawings 1~2, the adjustable LED control circuit of the utility model voltage, including bridge rectifier, Constant Electric Current
Flow control circuit, adjustable booster circuit and excess voltage protection；Bridge rectifier is arranged on the adjustable LED controls electricity of voltage
The front end that road is connected with power supply, for ac voltage rectifier to be obtained into direct current；
Constant current supply control circuit includes first comparator CMP1, the first metal-oxide-semiconductor M1 and variable resistor R1, first comparator
CMP1 output end is connected with the first metal-oxide-semiconductor M1 grid；First comparator CMP1 inverting input and the first metal-oxide-semiconductor M1's
Source electrode is in series with variable resistor 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 voltage REF1 current potentials and the first metal-oxide-semiconductor M1 source terminal, and VB magnitudes of voltage are fixed, and with REF1 voltage phases
Together, it is generally set to 0.1V~0.3V；Regulation resistance R1 resistance, so as 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
With high-voltage diode D1, the second comparator CMP2 output end is connected with pulse width regulating circuit PWM；Second comparator CMP2
Output end be connected with the second metal-oxide-semiconductor M2 grid；Second metal-oxide-semiconductor M2 drain electrode is connected with high-voltage diode D1；Second compares
Device CMP2 is used for the A points for comparing the reference voltage REF2 current potentials being connected with its in-phase input end and the first metal-oxide-semiconductor M1 drain electrode end
Current potential VA, the 2nd MOS is controlled using output control the pulse width modulation circuit PWM, pulse width modulation circuit PWM after relatively
Pipe M2；
Excess voltage protection is by the 3rd comparator CMP3, the first metal-oxide-semiconductor M1, pulse width modulation circuit PWM and second
Metal-oxide-semiconductor M2 is formed, and the 3rd comparator CMP3 output terminates to the first metal-oxide-semiconductor M1 grid, while comparator CMP3 output
The first metal-oxide-semiconductor M1 grid is terminated to, and is connected with pulse width modulation circuit PWM；3rd comparator CMP3 be used for compare with
The A point current potential VA of the connected reference voltage REF3 current potentials of its in-phase input end and the first metal-oxide-semiconductor M1 drain electrode end, 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 causing the A point voltages VA to exceed reference voltage REF3, the 3rd comparator CMP3 output low-potential signals, this letter
Number the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 will be closed, and so as to turn off the electric current of LED lamp bead, protect LED bulb, avoid the occurrence of peace
Full accident.
Family expenses 220V AC powers obtain 300V or so dc source by bridge rectifier.LED lamp bead is at normal temperatures
Ignition voltage is about 2V~3V.
The principle of adjustable booster circuit as shown in Figure 2, when the A points current potential of the first metal-oxide-semiconductor M1 drain electrode end is less than benchmark
During voltage REF2, pulse width modulation circuit PWM exports a high potential control signal VD, and this control signal opens the second metal-oxide-semiconductor
M2, so as to drag down E point current potentials, inductance L1 is charged, this charging interval 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 inductance L1 electric current will pass through high-voltage diode stream
To LED input, while also flow on the electric capacity C1 in parallel with LED, so as to improve LED input voltage VC, the first MOS
The A point current potentials VA of pipe M1 drain electrode end can also rise；When the A point current potentials VA of the first metal-oxide-semiconductor M1 drain electrode end is higher than reference voltage
During REF2, PWM output current potentials remain low potential, until the A point current potentials VA of the first metal-oxide-semiconductor M1 drain electrode end 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
For T2, T2 time 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 and PUMP voltage VC ratios are larger, 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 consolidated
After fixed, VLED voltages are also fixed；When the current potential VF of power supply F points is extremely higher, it will cause the first metal-oxide-semiconductor M1 drain electrode end
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 first metal-oxide-semiconductor M1 drain electrode end also will be inclined
It is high.
The circuit course of work：Assuming that the normally voltage of single LEDs 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 family expenses 220V power supplys are powered,
By bridge rectifier by alternating current it is whole be DC voltage VF, this voltage is about 300V, while passes through inductance L1, the pole of high pressure two
The VC current potentials of LED lamp bead are brought up to 300V or so by pipe D1.Because LED lamp bead normal luminous voltage is about 450V, therefore VA is electric
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 lifts VC current potential.After VC current potentials exceed certain voltage, LED lamp bead begins with electric current and flowed through, and 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 raise with VC rise.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 raised with VC rise.Due to VA current potentials still
Not less than 5V, VC voltages will continue to raise, after more than 455V, after VA voltages exceed reference voltage REF2, and pulse width modulation
Circuit PWM will close metal-oxide-semiconductor M2, and VC voltages will be raised no longer.LED lamp bead electric current is provided by electric capacity C1 connected in parallel, therefore
VC is by gradual step-down, and when VC is less than 455V, after VA voltages are less than reference voltage REF2, PWM will open from new, control metal-oxide-semiconductor M2,
VC voltage will be lifted by L1, M2 and D1, until VC current potentials close M2, VC is by stopping more than 455V, VA more than 5V
Rise, so circulation is gone down, and until 220V power-offs, either LED lamp bead appearance exception or 220V power supplys occur abnormal high.
Assuming that abnormal, up to 330V occurs in AC power, after bridge rectifier, VF current potentials are more than 460V, VC electricity
Pressure is also above 460V, and for VA voltages more than 10V, VA is higher than reference voltage REF3 10V voltages, comparator CMP1 output low-voltage letters
Number, MOS M1 and MOS M2 will be closed, so as to cut off the electric current in LED lamp bead, effectively avoid the occurrence of security incident.
Claims (2)
- A kind of 1. 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 on the front end that the adjustable LED control circuit of voltage is connected with power supply, for by alternating voltage Rectification obtains direct current；Constant current supply control circuit includes first comparator CMP1, the first metal-oxide-semiconductor M1 and variable resistor R1, first comparator CMP1 Output end be connected with the first metal-oxide-semiconductor M1 grid；First comparator CMP1 inverting input is in series with variable resistor R1 again after being connected with the first metal-oxide-semiconductor M1 source electrode；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 is pressed, the second comparator CMP2 output end is connected with pulse width regulating circuit PWM；Second comparator CMP2's is defeated Go out end with the second metal-oxide-semiconductor M2 grid to be connected；Second metal-oxide-semiconductor M2 drain electrode is connected with high-voltage diode D1；Excess voltage protection is by the 3rd comparator CMP3, the first metal-oxide-semiconductor M1, pulse width modulation circuit PWM and the second metal-oxide-semiconductor M2 is formed, and the 3rd comparator CMP3 output terminates to the first metal-oxide-semiconductor M1 grid, while comparator CMP3 output terminates to First metal-oxide-semiconductor M1 grid, and be connected with pulse width modulation circuit PWM.
- 2. the adjustable LED control circuit of voltage according to claim 1, it is characterised in that：Family expenses 220V AC powers pass through 300V dc source is obtained after bridge type rectifier circuit rectifies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720672476.9U CN206993457U (en) | 2017-06-12 | 2017-06-12 | A kind of adjustable LED control circuit of voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720672476.9U CN206993457U (en) | 2017-06-12 | 2017-06-12 | A kind of adjustable LED control circuit of voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206993457U true CN206993457U (en) | 2018-02-09 |
Family
ID=61396290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720672476.9U Withdrawn - After Issue CN206993457U (en) | 2017-06-12 | 2017-06-12 | A kind of adjustable LED control circuit of voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206993457U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107172751A (en) * | 2017-06-12 | 2017-09-15 | 无锡职业技术学院 | A kind of adjustable LED control circuit of voltage and its control method |
-
2017
- 2017-06-12 CN CN201720672476.9U patent/CN206993457U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107172751A (en) * | 2017-06-12 | 2017-09-15 | 无锡职业技术学院 | A kind of adjustable LED control circuit of voltage and its control method |
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| GR01 | Patent grant | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180209 Effective date of abandoning: 20180810 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180209 Effective date of abandoning: 20180810 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |