CN105282901B - A kind of LED drive power start-up circuit and starting method - Google Patents
A kind of LED drive power start-up circuit and starting method Download PDFInfo
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- CN105282901B CN105282901B CN201410276385.4A CN201410276385A CN105282901B CN 105282901 B CN105282901 B CN 105282901B CN 201410276385 A CN201410276385 A CN 201410276385A CN 105282901 B CN105282901 B CN 105282901B
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- circuit
- led drive
- control signal
- factor correction
- power factor
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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
- H05B45/355—Power factor correction [PFC]; Reactive power compensation
Abstract
The invention discloses a kind of LED drive power start-up circuit and starting methods, including driving unit and power factor correction unit；The power factor correction unit is connect with the driving unit, and the LED drive power start-up circuit further includes a time delay elements, is connected between the driving unit and power factor correction unit；The power factor correction unit generates a control signal and is sent to the time delay elements；The time delay elements handle the control signal, and generate an enabling signal to the driving unit；The driving unit starts after receiving the enabling signal.After adopting the above technical scheme, the starting timing of tunable Power Correction Factor circuit and driving circuit.
Description
Technical field
The present invention relates to driving power field more particularly to a kind of LED drive power start-up circuit and starting methods.
Background technique
In field of LED drive, circuit of power factor correction has been used more and more to increase the function in LED driving application
Rate factor.But after increasing, driving unit such as both self-oscillation circuit and circuit of power factor correction in LED drive circuit are tied
Can there are problems that starting timing when conjunction.The self-oscillation circuit starting time is usually less than 100mS；Circuit of power factor correction by
In realizing there are problems that delay by the way of the charging of external resistance capacitance, loss is considered, the usually starting time is located at
500mS or so.Therefore, in circuit start moment, circuit of power factor correction work obviously lags behind self-oscillation circuit.In this way
Busbar voltage can be caused to generate the low High variation of voltage in starting moment, cause to export electric current and generate to change, LED light source generates light and shade
Flashing.Meanwhile it will also result in LED and being damaged by the impact of peak point current.
Therefore, it is necessary to a kind of tunable circuit of power factor correction and the New LED driving circuit of driving circuit, protection to open
LED when dynamic.
Summary of the invention
The purpose of the present invention is to provide a kind of LED drive power start-up circuits, only open in power factor correction unit
Dynamic rear drive unit just will start.
The invention discloses a kind of LED drive power start-up circuits, including driving unit and power factor correction unit；Institute
Power factor correction unit to be stated to connect with the driving unit, the LED drive power start-up circuit further includes a time delay elements,
It is connected between the driving unit and power factor correction unit；It is concurrent that the power factor correction unit generates a control signal
It send to the time delay elements；The time delay elements handle the control signal, and generate an enabling signal to the driving unit；
The driving unit starts after receiving the enabling signal.
Preferably, the time delay elements include diode D1, resistance R1, resistance R2 and capacitor C1, the diode D1 with
The power factor correction unit connection, for receiving the control signal；One RC of the resistance R2 formation in parallel with capacitor C1
Circuit；The resistance R1 is connected between the diode D1 and the RC circuit.
Preferably, the power factor correction unit includes: capacitor C2, controller and auxiliary winding T1；The capacitor C2
It is connect with the input terminal of the controller, the auxiliary winding T1 is connect with the end ZCD of the controller；When the capacitor C2 fills
Electricity to the controller starting threshold value when, power factor correction unit work.
Preferably, the auxiliary winding T1 generates the control signal.
Preferably, the Power Correction Factor unit further includes a field-effect tube Q1；The field-effect tube Q1 and the control
The end GD of device processed connects；The end GD generates the control signal.
Preferably, the control signal is square-wave signal.
Preferably, the starting threshold value is 12.5V.
Preferably, the driving unit includes: self-maintained circuit or constant-current type driving circuit.
Preferably, the self-maintained circuit includes switching tube Q2；The base stage of the switching tube Q2 and the time delay elements
Connection, collector are connect with external loading, emitter ground connection.
The invention also discloses a kind of LED drive powers to start method, comprising: startup power factor correcting unit；It is described
Power factor correction unit sends a control signal to a time delay elements；The time delay elements handle the control signal, and send
One enabling signal is to driving unit；Start the driving unit.
After adopting the above technical scheme, the starting of driving unit is limited to the starting of power factor correction unit, and due to
The starting time of driving unit has been delayed in the effect of time delay elements, avoids the big electricity that moment is activated individually to LED in driving unit
Stream impact.
Detailed description of the invention
Fig. 1 is the circuit diagram of LED drive power start-up circuit in first embodiment of the invention；
Fig. 2 is the circuit diagram of LED drive power start-up circuit in second embodiment of the invention；
Fig. 3 is that LED drive power of the present invention starts method block diagram.
Specific embodiment
Below in conjunction with attached drawing, the advantages of the present invention are further explained with specific embodiment.
The invention discloses a kind of LED drive power start-up circuits, include driving unit and power factor correction unit.
Driving unit receives driving LED starting illumination after enabling signal, and is provided according to current standard, when LED power is greater than one
When fixed value (such as 25w), there is certain requirement to power factor.Therefore, increasing in LED drive power start-up circuit has power
Factor correcting unit is connect with above-mentioned driving unit, to power be greater than certain value LED driving application in power factor into
Row compensation.In order to reach purpose mentioned above, LED drive power start-up circuit further includes having a time delay elements, is connected to drive
Between moving cell and power factor correction unit, for coordinating the starting timing between driving unit and power factor correction unit.Tool
Body, a control signal will be sent after power factor correction unit starting to time delay elements connected to it, send control letter
Number purpose be driving unit start；After receiving the control signal, time delay elements will be handled the control signal, this
In the processing include but is not limited to the transmission for postponing the signal, to filtering for controlling signal etc..After being disposed, time delay list
Member will generate an enabling signal, and the enabling signal is sent to driving unit, and according to the enabling signal, driving unit response is opened
It is dynamic.
From the point of view of above-mentioned starting timing, after power factor correction unit starts in advance, when the control signal issued passes through
The delay process for prolonging unit, in the time limit of the control signal processing, power factor correction unit normally starting finish or
It will normally start and finish, and rear drive unit just receives enabling signal and prepares starting, so that the boot sequence of driving unit is equal
Afterwards in power factor correction unit, that is, reaches power factor correction unit and will not be later than driving unit and start and avoid peak point current
The effect of impact.
In one preferred embodiment, time delay elements include diode D1, resistance R1, resistance R2 and capacitor C1, wherein diode
The anode of D1 is connect with power factor correction unit, more specifically, connect with the signal output end of power factor correction unit,
So that the control signal that power factor correction unit issues is sent to diode D1.The cathode of resistance R1 and diode D1 connects
It connects, then, resistance R2 one RC circuit of formation in parallel with capacitor C1, and connect with resistance R1, so that resistance R1 is connected to diode
Between D1 and the RC circuit.The RC circuit is filtered the control signal that diode D1 is received, concrete operating principle are as follows:
R1 is used to limit the charging current of C1, and R2 is for the electric discharge to C1.The resistance value of R1 determines charging current；Charging current is big,
Delay time is short, otherwise charging current is small, and delay time is long.The resistance value of R2 then determines the size of discharge current；Discharge current is big,
Delay time is long, otherwise discharge current is small, and delay time is short.Therefore, certain delay effect can be played.
Certainly, the selection of time delay elements is not limited to the scheme in above-described embodiment, for example, using driving unit is connected to
The reception of single-chip microcontroller control control signal between power factor correction unit and transmission timing, can equally play above-mentioned delay
Effect.
Alternatively and preferably, power factor correction unit includes: capacitor C2, controller and auxiliary winding T1, capacitor
C2 is connect with external power supply, for receiving electric power and slowly charging, connect with the input terminal Vcc of controller, electric power is forwarded
To controller.When specific works, after external ac power source AC input, the voltage after rectification charges to capacitor C2, due to using
The configuration of capacitor C2, only when capacitor C2 charges to the starting threshold value of controller, power factor correction unit can just start work
Make, plays the effect of soft start to power factor correction unit in advance.Similarly, circuit of power factor correction further includes resistance
R2, is connected in parallel on the both ends capacitor C2, and the size of the charging current for limiting capacitance C2 forms another RC circuit, to treated
Signal is filtered, meanwhile, as described above, certain delay effect can also be played.In one embodiment, which is
12.5V.Auxiliary winding T1 is connected by diode with capacitor C2, wherein the electric current that diode is input auxiliary winding T1 into
Row rectification, capacitor C2 are energy storage and filter action, and the energy of storage can provide electric energy, subsequent auxiliary winding T1 for controller
It is connected to the end ZCD (zero passage detection end) of controller, auxiliary winding T1 is to controller pulse control signal, specifically used mode
It can be adjusted according to practical application.
Refering to fig. 1 and Fig. 2, auxiliary winding T1 has different working conditions in two embodiments.Referring initially to Fig. 1, for this
The circuit diagram of LED drive power start-up circuit in invention first embodiment, auxiliary winding T1 is to generate control in the embodiment
The application of signal processed, by an output end (in Fig. 1 be the end A) output control signal outward, wherein output end and controller
The connection of the end ZCD, and connect with time delay elements.The control signal of output is sent to time delay elements, is handled by time delay elements.
It is the circuit diagram of LED drive power start-up circuit in second embodiment of the invention with continued reference to Fig. 2, it is auxiliary in the embodiment
Help winding T1 to provide the application of electric energy to controller, in this embodiment, control signal is produced by the PFC chip in controller
It is raw, it further include a field-effect tube Q1, the end the GD (output of the one end field-effect tube Q1 and controller in power factor correction unit
End) connection, the other end be connected with current sampling resistor control signal then pass through it is defeated between the end GD of controller and field-effect tube Q1
Outlet (being the end B in figure) is sent to time delay elements.The mode that control signal is generated in above-mentioned two embodiment can be replaced according to the actual situation
It changes, can be used.
In any of the above-described embodiment, control signal is the signal that auxiliary winding T1 or controller output end export, specially
Square-wave signal.
Alternatively and preferably, driving unit includes a self-maintained circuit, which includes a switch
Pipe Q2, base stage are connect with time delay elements, and collector is then connect with external loading, emitter ground connection.The self-maintained circuit is
RCC self-maintained circuit, after receiving the enabling signal that time delay elements are sent, switching tube Q2 biasing starting is driven to play change
The purpose of the starting timing of moving cell and time delay elements.As described above, may also set up in self-maintained circuit multiple resistance with
Capacitor forms RC circuit, by the size of current of the charge and discharge of resistance control capacitor, so that in the LED drive power start-up circuit
Each element circuit all has the function of soft start, avoids destruction of the peak current to electronic component.
In above-described embodiment, the selection of driving unit is not limited only to self-maintained circuit, other and PFC list
The different circuit such as constant-current type driving circuit of member starting timing can be used in this embodiment.
Refering to Fig. 3, the invention also discloses a kind of starting methods of LED drive power, firstly, circuit of power factor correction
Starting, then it sends a control signal to a time delay elements, and time delay elements is transferred to be filtered and be delayed the control signal
Processing, while the effect of delay can also be played.After being disposed, time delay elements send enabling signal to driving unit, only work as drive
After moving cell receives the enabling signal, driving unit starts work.
After adopting the above technical scheme, the starting of driving unit is limited to the starting of power factor correction unit, and due to
The starting time of driving unit has been delayed in the effect of time delay elements, avoids the big electricity that moment is activated individually to LED in driving unit
Stream impact.
It should be noted that the embodiment of the present invention has preferable implementation, and not the present invention is made any type of
Limitation, any one skilled in the art change or are modified to possibly also with the technology contents of the disclosure above equivalent effective
Embodiment, as long as without departing from the content of technical solution of the present invention, it is to the above embodiments according to the technical essence of the invention
Any modification or equivalent variations and modification, all of which are still within the scope of the technical scheme of the invention.
Claims (8)
1. a kind of LED drive power start-up circuit, including driving unit and power factor correction unit；
The power factor correction unit is connect with the driving unit, it is characterised in that:
The LED drive power start-up circuit further includes a time delay elements, is connected to the driving unit and PFC
Between unit；
The power factor correction unit generates a control signal and is sent to the time delay elements；
The time delay elements handle the control signal, and generate an enabling signal to the driving unit；
The driving unit starts after receiving the enabling signal；
The power factor correction unit includes: capacitor C2, controller and auxiliary winding T1；
The capacitor C2 is connect with the input terminal of the controller, and the auxiliary winding T1 is connect with the end ZCD of the controller；
When the capacitor C2 charges to the starting threshold value of the controller, the power factor correction unit work；
The auxiliary winding T1 generates the control signal.
2. LED drive power start-up circuit as described in claim 1, it is characterised in that:
The time delay elements, including diode D1, resistance R1, resistance R2 and capacitor C1,
The diode D1 is connect with the power factor correction unit, for receiving the control signal；
One RC circuit of the resistance R2 formation in parallel with capacitor C1；
The resistance R1 is connected between the diode D1 and the RC circuit.
3. LED drive power start-up circuit as described in claim 1, it is characterised in that:
The Power Correction Factor unit further includes a field-effect tube Q1；
The field-effect tube Q1 is connect with the end GD of the controller；
The end GD generates the control signal, and replacement auxiliary winding T1 generates the control signal.
4. LED drive power start-up circuit as described in any one of claims 1-3, it is characterised in that:
The control signal is square-wave signal.
5. LED drive power start-up circuit as described in any one of claims 1-3, it is characterised in that:
The starting threshold value is 12.5V.
6. LED drive power start-up circuit as described in claim 1, it is characterised in that:
The driving unit includes: self-maintained circuit or constant-current type driving circuit.
7. LED drive power start-up circuit as claimed in claim 6, it is characterised in that:
The self-maintained circuit includes switching tube Q2；
The base stage of the switching tube Q2 is connect with the time delay elements, and collector is connect with external loading, emitter ground connection.
8. a kind of LED drive power applied to the described in any item LED drive power start-up circuits of such as claim 1-7 starts
Method, comprising:
Startup power factor correcting unit；
The power factor correction unit sends a control signal to a time delay elements；
The time delay elements handle the control signal, and send an enabling signal to driving unit；
Start the driving unit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410276385.4A CN105282901B (en) | 2014-06-19 | 2014-06-19 | A kind of LED drive power start-up circuit and starting method |
| PCT/CN2014/089409 WO2015192576A1 (en) | 2014-06-19 | 2014-10-24 | Led drive power start-up circuit and start-up method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410276385.4A CN105282901B (en) | 2014-06-19 | 2014-06-19 | A kind of LED drive power start-up circuit and starting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105282901A CN105282901A (en) | 2016-01-27 |
| CN105282901B true CN105282901B (en) | 2019-01-04 |
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ID=54934801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410276385.4A Active CN105282901B (en) | 2014-06-19 | 2014-06-19 | A kind of LED drive power start-up circuit and starting method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105282901B (en) |
| WO (1) | WO2015192576A1 (en) |
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| CN101552546A (en) * | 2008-04-02 | 2009-10-07 | 台达电子工业股份有限公司 | Bridgeless power factor circuit correcting circuit system used for critical conduction mode and control method thereof |
| CN201656761U (en) * | 2010-01-08 | 2010-11-24 | 康佳集团股份有限公司 | Soft start circuit for PFC switch power supply |
| CN201860260U (en) * | 2010-10-29 | 2011-06-08 | 东莞市百力达光电科技有限公司 | Time sequence control circuit of power supply |
| CN102196649A (en) * | 2010-03-11 | 2011-09-21 | 北京为华新光电子有限公司 | Circuit protection control system of electronic ballast |
| US20120043900A1 (en) * | 2010-08-18 | 2012-02-23 | Lutron Electronics Co., Inc. | Method and Apparatus for Measuring Operating Characteristics in a Load Control Device |
| CN102404925A (en) * | 2010-09-10 | 2012-04-04 | 奥斯兰姆有限公司 | Electronic ballast for lighting unit and lighting equipment |
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| JPH11332220A (en) * | 1998-05-18 | 1999-11-30 | Sony Corp | Dc power supply circuit |
| CN102735906B (en) * | 2012-07-05 | 2014-11-05 | 矽力杰半导体技术(杭州)有限公司 | Inductive current detecting circuit and LED (light emitting diode) driving circuit using inductive current detecting circuit |
| CN203206508U (en) * | 2013-03-25 | 2013-09-18 | 福建省卓珏光电科技有限公司 | Novel LED lamp driving circuit |
| CN103347350B (en) * | 2013-07-29 | 2015-04-22 | 常熟银海集成电路有限公司 | Isolated constant-current LED (light-emitting diode) drive chip of peripheral circuit free of auxiliary winding of transformer |
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2014
- 2014-06-19 CN CN201410276385.4A patent/CN105282901B/en active Active
- 2014-10-24 WO PCT/CN2014/089409 patent/WO2015192576A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101552546A (en) * | 2008-04-02 | 2009-10-07 | 台达电子工业股份有限公司 | Bridgeless power factor circuit correcting circuit system used for critical conduction mode and control method thereof |
| CN201656761U (en) * | 2010-01-08 | 2010-11-24 | 康佳集团股份有限公司 | Soft start circuit for PFC switch power supply |
| CN102196649A (en) * | 2010-03-11 | 2011-09-21 | 北京为华新光电子有限公司 | Circuit protection control system of electronic ballast |
| US20120043900A1 (en) * | 2010-08-18 | 2012-02-23 | Lutron Electronics Co., Inc. | Method and Apparatus for Measuring Operating Characteristics in a Load Control Device |
| CN102404925A (en) * | 2010-09-10 | 2012-04-04 | 奥斯兰姆有限公司 | Electronic ballast for lighting unit and lighting equipment |
| CN201860260U (en) * | 2010-10-29 | 2011-06-08 | 东莞市百力达光电科技有限公司 | Time sequence control circuit of power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105282901A (en) | 2016-01-27 |
| WO2015192576A1 (en) | 2015-12-23 |
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