CN106686850A - Light-emitting diode soft start circuit - Google Patents
Light-emitting diode soft start circuit Download PDFInfo
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- CN106686850A CN106686850A CN201510759832.6A CN201510759832A CN106686850A CN 106686850 A CN106686850 A CN 106686850A CN 201510759832 A CN201510759832 A CN 201510759832A CN 106686850 A CN106686850 A CN 106686850A
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- current source
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- emitting diode
- light emitting
- frequency counter
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention provides a light-emitting diode soft start circuit which comprises a time sequence control module and an internal current source module. The time sequence control module includes a frequency division counter and an enable circuit. The enable circuit receives an external signal. When an external signal potential is changed, the enable circuit triggers the frequency division counter to start counting, and the frequency division counter sends at least one control signal. The internal current source module comprises at least one mirror current source and at least one control switch. The at least one control switch controls the switch-on and switch-off of the at least one mirror current source according to the at least one control signal.
Description
Technical field
The present invention relates to a kind of light emitting diode soft starting circuit, espespecially one kind is applied to AC-DC LED drive currents electricity
The light emitting diode soft starting circuit on road.
Background technology
Fig. 1 shows that one kind is existing and removes ripple light emitting diode (LED) drive circuit, including each component as depicted, wherein,
Current source IAC carries ripple, and node CMPOUT is the output end of comparator CMP, when the voltage of node CMPOUT is high,
Switch SU conductings, when the voltage of node CMPOUT is low, switch SD conductings.Additionally, also include NMOSFET power tube M1,
Error amplifier EA, and as the current source IU and current source ID in internal current reference source.
The implementation method for removing ripple is the non-inverting input by controlling error amplifier EA, that is, the voltage line of node VC
Ripple, and then control the reverse input end of error amplifier EA, that is, the voltage ripple of node CS so that flow through the electricity of LED
Flow liner ripple and node VC voltage ripple positive correlations.Therefore, it is existing to go ripple LED drive schemes by node VC discharge and recharges
Current source IU and current source ID is controlled in less current value, to realize less current ripples.What this control method was brought asks
Topic is that the low current charge of node VC current over pulse phenomenon easily occurs in start-up course, and then micro- sudden strain of a muscle interference is produced to human eye.
Fig. 2 shows each key node waveform timing chart that Fig. 1 is gone in ripple LED driving circuit, it is assumed that go defeated after ripple
The peak-to-peak value for going out current ripples is 0, it is stable after the peak-to-peak value of LED fluctuate close 0 near reference voltage VREF.Go when existing
On ripple LED drive circuit after electricity, because node VC voltages are in high potential, power tube M1 is operated in linear zone, now should
Ripple LED drive circuit is removed without going ripple function.Because the node LED voltage of Fig. 1 is less than reference voltage VREF, node CMPOUT
Voltage is 0, and switch SD conductings, node VC is discharged by current source ID.
Interval in time point t1-t2, as the node VIN voltage of Fig. 1 is gradually increasing, power tube M1 is operated in saturation region, this
When go ripple loop set up.Because less node VC voltages can not provide the corresponding node CS voltages of current source IAC, cause
The current potential of node LED starts suddenly to rise.
Interval in time point t2-t3, node LED potential durations rise, and node LED voltage is more than reference voltage VREF, node
CMPOUT is output as high level, and switch SU conductings, internal current source IU starts to give node VC chargings, so that node VC is electric
Position begins to ramp up.
At the time point t3 moment, node VC voltages rise to and provide enough the corresponding node CS voltages of current source IAC, therefore save
The voltage of point LED does not continue to rise.
Interval in time point t3-t4, node VC voltages continue to raise.The corresponding node CS voltages of current source IAC are compared, this
Shi Jiedian VC voltages are higher so that node LED voltage begins to decline.On the other hand, the voltage of node LED still above
Reference voltage VREF, therefore node VC voltages continue to rising.
At the time point t4 moment, node LED voltage is equal to reference voltage VREF, and node VC voltages stop rising.However, this
When the node CS voltages that produce of higher node VC voltages be much larger than the corresponding node CS voltages of current source IAC, cause node
LED voltage continuous decrease, causes node CMPOUT to be output as low level, and internal current source ID is discharged to node VC.
It is interval in time point t4-t5, it is existing to go ripple LED drive circuit to adjust through loop itself, it is final stable in closed loop work
Make a little.
As described above, whole start-up course, due to node VC voltage overshoots, causes the electric current for flowing through LED also to produce overshoot therewith,
LED certainly will be caused to have micro- flashing as causing the harmful effect to human eye vision.Therefore, how providing one kind can remove ripple and not
The light emitting diode soft starting circuit of the micro- elephants that flash of LED, as each dealer problem urgently to be resolved hurrily can be caused.
The content of the invention
In view of the disadvantages of known techniques, the main object of the present invention, that is, be to provide one kind to remove ripple and will not cause LED
The light emitting diode soft starting circuit of micro- elephant that flashes.
In order to achieve the above object and other purposes, the present invention provides a kind of light emitting diode soft starting circuit then, it is characterised in that
Including time-sequence control module and internal current source module.
The time-sequence control module includes frequency counter and enable circuit, wherein, the enable circuit receives an external signal, when
When the external signal current potential changes, the enable circuit triggers the frequency counter and starts counting up, and the frequency counter sends at least one
Individual control signal；And the internal current source module includes at least one mirror current source and at least one controlling switch, wherein,
At least one controlling switch controls the conducting and shut-off of at least one mirror current source according at least one control signal.
Implement in pattern in one, when high level or low level that the external signal is acquiescence, by least one controlling switch
Control, make at least one mirror current source simultaneously turn on, sequentially turn off this at least according at least one control signal afterwards
One mirror current source.
Implement in pattern in one, a cycle counts default setting of the frequency counter is 8 or 8 integer multiple.
In one implement pattern in, the frequency counter count cycle default setting be 4 grades or 4 integral multiple several levels.
Compared to known techniques, due to the light emitting diode soft starting circuit of the present invention, by enabling circuit from going ripple LED to drive
Dynamic circuit receives an external signal, and the external signal is the output signal of comparator CMP, that is, node CMPOUT voltages, when
When the external signal is the high level or low level of acquiescence, ripple LED drive circuit internal current source IU is gone except opening, this is extremely
A few mirror current source is simultaneously turned on and charged to the node VC for removing ripple LED drive circuit, under conditions of large current charge,
Node VC voltage rapid increases, realize optimum time match.The control signal sent according to frequency counter afterwards is sequentially turned off
At least one mirror current source, realizes starting seamlessly transitting to steady operation, is finally reached the optimal control of startup, eliminates
Single- stage PFC constant current drive realize without the startup brought while stroboscopic application it is micro- flash as, sufficiently address prior art lack
Lose.
Description of the drawings
Fig. 1 removes ripple LED driving circuit for one kind is existing.
Fig. 2 shows each key node waveform timing chart that Fig. 1 is gone in ripple LED driving circuit.
Fig. 3 is the driving electricity of the light emitting diode soft starting circuit of the present invention and application light emitting diode soft starting circuit of the present invention
Road configuration diagram.
Fig. 4 is each key node waveform timing chart in the drive circuit using light emitting diode soft starting circuit of the present invention.
Symbol description：
1 light emitting diode soft starting circuit
10 time-sequence control modules
11 internal current source modules
100 frequency counters
101 enable circuit
S1～Sn controlling switches
I1～In mirror current sources
IAC, IU, ID current source
SU, SD are switched
VREF reference voltages
EA error amplifiers
CMP comparators
M1 power tubes
CS, CMPOUT, VC, VIN, LED node
T1～t5 time points
Specific embodiment
Hereinafter embodiments of the present invention are illustrated by particular specific embodiment, those skilled in the art can be by this specification institute
The content of announcement understands easily other advantages and effect of the present invention.The present invention also can add by other different specific embodiments
To implement or apply.
Fig. 3 is referred to, Fig. 3 is the light emitting diode soft starting circuit of the present invention and application light emitting diode soft start of the present invention electricity
The drive circuit structure schematic diagram on road.As illustrated, the light emitting diode soft starting circuit 1 of the present invention, it is characterised in that include
Time-sequence control module 10 and internal current source module 11.
Time-sequence control module 10 includes frequency counter 100 and enable circuit 101, wherein, enable circuit 101 and receive outside one
Portion's signal, the external signal is the output signal of comparator CMP, that is, node CMPOUT voltages, when the external signal current potential
During change, enable the triggering frequency counter 100 of circuit 101 and start counting up, frequency counter 100 sends at least one control letter
Number；And internal current source module 11 includes at least one 1～In of mirror current source I and at least one controlling switch S1～Sn, its
In, at least one controlling switch S1～Sn controls leading at least one mirror current source 1～In of I according at least one control signal
Logical and shut-off.
In an embodiment, external signal current potential change refers to node CMPOUT current potentials by the negative saltus step that " 1 " saltus step is " 0 ",
However, in other embodiments, external signal current potential change refers to that node CMPOUT current potentials are " 1 " by " 0 " saltus step.
In an embodiment, when high level or low level that the external signal is acquiescence, at least one controlling switch can be passed through
The control of S1～Sn, makes at least one mirror current source 1～In of I simultaneously turn on, and sequentially closes according at least one control signal afterwards
Disconnected at least one mirror current source 1～In of I, the mirror current source 1～In of I of conducting are more, and the electric current charged to node VC is bigger.
In an embodiment, a cycle counts of frequency counter 100 can default setting be 8 or 8 integer multiple.
In an embodiment, counting cycle of frequency counter 100 can default setting be 4 grades or 4 integral multiple several levels, series
Arrange it is more, the output current of LED cross get over it is smooth.
Fig. 4 is referred to, when Fig. 4 is each key node waveform in the drive circuit using light emitting diode soft starting circuit of the present invention
Sequence figure.The operation principle of light emitting diode soft starting circuit 1 of the present invention will be explained according to time sequencing below：
Interval in time point t1-t2, as the voltage of node VIN is gradually increasing, power tube M1 is operated in saturation region, now goes
Ripple loop is set up.Because less node VC voltages can not provide the corresponding node CS voltages of current source IAC, cause node
The current potential of LED starts suddenly to rise.
Interval in time point t2-t3, the potential duration of node LED rises, and node LED voltage is more than reference voltage VREF, section
Point CMPOUT is output as high level, switch SU conductings, while at least one controlling switch S1～Sn is both turned on, internal current source
IU and at least one 1～In of mirror current source I charges to node VC simultaneously, because high current charges to node VC, node VC
Voltage rise quickly.
At the time point t3 moment, node VC voltages rise to and provide enough the corresponding node CS voltages of current source IAC, this time
Point LED voltage does not continue to rise.
Interval in time point t3-t4, node VC voltages continue to raise.The corresponding node CS voltages of current source IAC are compared, this
Shi Jiedian VC voltages are higher so that node LED voltage begins to decline.On the other hand, the voltage of node LED still above
Reference voltage VREF, therefore node VC voltages continue to rising.
At the time point t4 moment, node LED voltage is substantially equal to reference voltage VREF, and node VC voltages stop rising.Now
The node CS voltages node CS voltages corresponding with current source IAC that node VC voltages are produced remain basically stable, and node LED current potentials are steady
Determine, internal current source IU and at least one 1～In of mirror current source I still give node VC discharge and recharges.
It is interval in time point t4-t5, light emitting diode soft starting circuit 1 of the present invention in multiple node VC charging-discharging cycles, extremely
A few controlling switch S1～Sn progressively closes successively at least one mirror current source 1～In of I according at least one control signal,
Final only remaining internal current source IU and ID, the stable Closed loop operation point in small current charge and discharge electrical nodes VC realizes that startup is luminous
Diode current is seamlessly transitted to low ripple state.
Due to the present invention light emitting diode soft starting circuit, by enable circuit from go ripple LED drive circuit receive one outside
Signal, the external signal is the output signal of comparator CMP, that is, node CMPOUT voltages, when the external signal is acquiescence
High level or during low level, go ripple LED drive circuit internal current source IU except opening, at least one mirror current source
Simultaneously turn on and charged to the node VC for removing ripple LED drive circuit, under conditions of large current charge, node VC voltages are quick
Rise, realize optimum time match.The control signal sent according to frequency counter afterwards sequentially turns off at least one mirror image
Current source, realizes starting seamlessly transitting to steady operation, is finally reached the optimal control of startup, eliminates single- stage PFC constant current and drives
It is dynamic to realize flashing as sufficiently addressing the disappearance of prior art without the startup brought while stroboscopic application is micro-.
By the description of above preferred embodiment, one skilled in the art when can the more clear present invention feature with
Spirit, only above-described embodiment principle only to illustrate the invention and its effect, and be not used to limit the present invention.Therefore, it is any right
Modification and change without departing from spirit of the invention that above-described embodiment is carried out, and the interest field of the present invention should be such as claim institute
Row.
Claims (4)
1. a kind of light emitting diode soft starting circuit, it is characterised in that include：
Time-sequence control module, including frequency counter and enable circuit, wherein, the enable circuit receives an external signal,
When the external signal current potential changes, the enable circuit triggers the frequency counter and starts counting up, and the frequency counter is sent to
A few control signal；And
Internal current source module, including at least one mirror current source and at least one controlling switch, wherein, this at least one
Individual controlling switch controls the conducting and shut-off of at least one mirror current source according at least one control signal.
2. light emitting diode soft starting circuit as claimed in claim 1, it is characterised in that when the high level that the external signal is acquiescence
Or during low level, by the control of at least one controlling switch, make at least one mirror current source simultaneously turn on, it
Sequentially turn off at least one mirror current source according at least one control signal afterwards.
3. light emitting diode soft starting circuit as claimed in claim 1, it is characterised in that a cycle of the frequency counter is counted
Number of times default setting is 8 or 8 integer multiple.
4. light emitting diode soft starting circuit as claimed in claim 1, it is characterised in that the counting cycle acquiescence of the frequency counter
Be set to 4 grades or 4 integral multiple several levels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510759832.6A CN106686850B (en) | 2015-11-10 | 2015-11-10 | Light emitting diode soft starting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510759832.6A CN106686850B (en) | 2015-11-10 | 2015-11-10 | Light emitting diode soft starting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106686850A true CN106686850A (en) | 2017-05-17 |
| CN106686850B CN106686850B (en) | 2019-06-04 |
Family
ID=58863679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510759832.6A Active CN106686850B (en) | 2015-11-10 | 2015-11-10 | Light emitting diode soft starting circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN106686850B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196497A (en) * | 2017-06-20 | 2017-09-22 | 西安电子科技大学 | A kind of electric current soft starting circuit driven for LED |
| CN109819544A (en) * | 2017-11-21 | 2019-05-28 | 帝奥微电子有限公司 | Eliminate starting flash lamp circuit |
Citations (6)
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| US20020140463A1 (en) * | 2001-03-15 | 2002-10-03 | Paul Cheung | Programmable soft-start control for charge pump |
| CN201191806Y (en) * | 2008-05-09 | 2009-02-04 | 华中科技大学 | Soft starting circuit for impulse-width modulating DC-DC switch power supply |
| CN101662206A (en) * | 2009-09-23 | 2010-03-03 | 上海导向微电子有限公司 | Soft start circuit, method and switch power supply circuit |
| CN203104287U (en) * | 2012-12-28 | 2013-07-31 | 北京中科汉天下电子技术有限公司 | A charging and discharging circuit and a timing circuit |
| CN203167383U (en) * | 2013-04-08 | 2013-08-28 | 帝奥微电子有限公司 | Rapid soft starting circuit for inhibiting overshoot |
| CN204031553U (en) * | 2014-08-21 | 2014-12-17 | 浙江东和电子科技有限公司 | A kind of LED drive circuit and soft starting circuit thereof |
-
2015
- 2015-11-10 CN CN201510759832.6A patent/CN106686850B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020140463A1 (en) * | 2001-03-15 | 2002-10-03 | Paul Cheung | Programmable soft-start control for charge pump |
| CN201191806Y (en) * | 2008-05-09 | 2009-02-04 | 华中科技大学 | Soft starting circuit for impulse-width modulating DC-DC switch power supply |
| CN101662206A (en) * | 2009-09-23 | 2010-03-03 | 上海导向微电子有限公司 | Soft start circuit, method and switch power supply circuit |
| CN203104287U (en) * | 2012-12-28 | 2013-07-31 | 北京中科汉天下电子技术有限公司 | A charging and discharging circuit and a timing circuit |
| CN203167383U (en) * | 2013-04-08 | 2013-08-28 | 帝奥微电子有限公司 | Rapid soft starting circuit for inhibiting overshoot |
| CN204031553U (en) * | 2014-08-21 | 2014-12-17 | 浙江东和电子科技有限公司 | A kind of LED drive circuit and soft starting circuit thereof |
Non-Patent Citations (1)
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| 张赓毅: "《如何用计数器实现任意分频》", 《硬件与维修》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196497A (en) * | 2017-06-20 | 2017-09-22 | 西安电子科技大学 | A kind of electric current soft starting circuit driven for LED |
| CN107196497B (en) * | 2017-06-20 | 2019-09-20 | 西安电子科技大学 | A kind of electric current soft starting circuit for LED driving |
| CN109819544A (en) * | 2017-11-21 | 2019-05-28 | 帝奥微电子有限公司 | Eliminate starting flash lamp circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106686850B (en) | 2019-06-04 |
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| CP02 | Change in the address of a patent holder |
Address after: 226017 Nantong science and Technology Industrial Park, Su Tong Road, Jiangsu, No. 14, No. 16 Patentee after: Dioo Microelectronic Co., Ltd. Address before: 201103, No. 3, Hongqiao International Business Plaza, 2679 Hechuan Road, Shanghai, Minhang District, 603 Patentee before: Dioo Microelectronic Co., Ltd. |
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Address after: No.16, wei14 Road, Sutong science and Technology Industrial Park, Nantong, Jiangsu Province Patentee after: Jiangsu Dior Microelectronics Co., Ltd Address before: 226017 Nantong science and Technology Industrial Park, Su Tong Road, Jiangsu, No. 14, No. 16 Patentee before: DIAO MICROELECTRONICS Co.,Ltd. |
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Address after: 6 / F, building 8, Zilang science and Technology City, Nantong innovation District, 60 Chongzhou Avenue, Nantong City, Jiangsu Province, 226000 Patentee after: Jiangsu Dior Microelectronics Co., Ltd Address before: No.16, wei14 Road, Sutong science and Technology Industrial Park, Nantong City, Jiangsu Province, 226000 Patentee before: Jiangsu Dior Microelectronics Co., Ltd |