CN105282901A - LED driving power supply starting circuit and method - Google Patents
LED driving power supply starting circuit and method Download PDFInfo
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- CN105282901A CN105282901A CN201410276385.4A CN201410276385A CN105282901A CN 105282901 A CN105282901 A CN 105282901A CN 201410276385 A CN201410276385 A CN 201410276385A CN 105282901 A CN105282901 A CN 105282901A
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- circuit
- factor correction
- power factor
- control signal
- led drive
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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
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- Led Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses an LED driving power supply starting circuit and method. The starting circuit comprises a driving unit, a power factor correction unit connected to the power unit, and a time delay unit connected between the driving unit and the power factor correction unit; the power factor correction unit generates a control signal and sends the control signal to the time delay unit; the time delay unit processes the control signal, generates a start signal and sends the start signal to the driving unit; and the driving unit is started after receiving the start signal. Thus, the starting sequence of the power factor correction circuit and the driving circuit can be coordinated.
Description
Technical field
The present invention relates to driving power field, particularly relate to a kind of LED drive power start-up circuit and starting method.
Background technology
In field of LED drive, employ circuit of power factor correction more and more and drive the power factor in applying to increase LED.But after increasing, the driver element in LED drive circuit as self-oscillation circuit and circuit of power factor correction in conjunction with time can there is the problem starting sequential.The self-oscillation circuit start time is usually less than 100mS; Circuit of power factor correction realizes owing to adopting the mode of outer meeting resistance capacitor charging, and there is the problem of time delay, consider loss, usual start-up time is located at about 500mS.Therefore, in circuit start moment, circuit of power factor correction work obviously lags behind self-oscillation circuit.Busbar voltage can be caused like this to produce the low High variation of voltage instantaneously in startup, cause output current to change, LED light source produces light and shade flicker.Meanwhile, LED also can be caused to be subject to the impact of peak current and to damage.
Therefore, need the New LED drive circuit of a kind of tunable circuit of power factor correction and drive circuit, LED when protection starts.
Summary of the invention
The object of the present invention is to provide a kind of LED drive power start-up circuit, only start rear drive unit at power factor correction unit and just can start.
The invention discloses a kind of LED drive power start-up circuit, comprise driver element and power factor correction unit; Described power factor correction unit is connected with described driver element, and described LED drive power start-up circuit also comprises a time delay elements, is connected between described driver element and power factor correction unit; Described power factor correction unit produces a control signal and is sent to described time delay elements; Control signal described in described time delay elements process, and produce an enabling signal to described driver element; Described driver element starts after receiving described enabling signal.
Preferably, described time delay elements comprises diode D1, resistance R1, resistance R2 and electric capacity C1, and described diode D1 is connected with described power factor correction unit, for receiving described control signal; Described resistance R2 is in parallel with electric capacity C1 forms a RC circuit; Described resistance R1 is connected between described diode D1 and described RC circuit.
Preferably, described power factor correction unit comprises: electric capacity C2, controller and auxiliary winding T1; Described electric capacity C2 is connected with the input of described controller, and described auxiliary winding T1 holds with the ZCD of described controller and is connected; When described electric capacity C2 charges to the startup threshold value of described controller, described power factor correction unit work.
Preferably, described auxiliary winding T1 produces described control signal.
Preferably, described Power Correction Factor unit also comprises a field effect transistor Q1; Described field effect transistor Q1 holds with the GD of described controller and is connected; Described GD end produces described control signal.
Preferably, described control signal is square-wave signal.
Preferably, described startup threshold value is 12.5V.
Preferably, described driver element comprises: self-maintained circuit or constant-current type drive circuit.
Preferably, described self-maintained circuit comprises switching tube Q2; The base stage of described switching tube Q2 is connected with described time delay elements, and collector electrode is connected with external loading, grounded emitter.
The invention also discloses a kind of LED drive power starting method, comprising: starting power factor correcting unit; Described power factor correction unit sends a control signal to a time delay elements; Control signal described in described time delay elements process, and send an enabling signal to driver element; Start described driver element.
Adopt after technique scheme, the startup of driver element is limited to the startup of power factor correction unit, and due to the effect of time delay elements, has delayed the start-up time of driver element, avoided driver element and start separately instantaneously to the heavy current impact of LED.
Accompanying drawing explanation
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 LED drive power starting method block diagram of the present invention.
Embodiment
Advantage of the present invention is set forth further below in conjunction with accompanying drawing and specific embodiment.
The invention discloses a kind of LED drive power start-up circuit, include driver element and power factor correction unit.Driver element receives enabling signal rear drive LED and starts illumination, and according to current standard regulation, when LED power is greater than certain value (as 25w), has certain requirement to power factor.Therefore, in LED drive power start-up circuit, increase power factor correction unit, be connected with above-mentioned driver element, LED power being greater than to certain value drives the power factor in application to compensate.In order to reach object mentioned above, LED drive power start-up circuit also includes a time delay elements, is connected between driver element and power factor correction unit, for coordinating the startup sequential between driver element and power factor correction unit.Particularly, transmission one is controlled signal to connected time delay elements after starting by power factor correction unit, and the object sending this control signal is that driver element starts; After receiving this control signal, time delay elements will process this control signal, and process described here includes but not limited to postpone the transmission of this signal, the filtering etc. to control signal.After being disposed, this enabling signal by generation one enabling signal, and is sent to driver element by time delay elements, and according to this enabling signal, driver element response starts.
From above-mentioned startup sequential, after power factor correction unit starts in advance, its control signal sent is through the delay process of time delay elements, in time limit to this control signal process, power factor correction unit normally starts complete or complete by normal startup, and rear drive unit just receives enabling signal preparation startup, the boot sequence making driver element all after in power factor correction unit, namely reach power factor correction unit and can not be later than driver element and start and the effect avoiding peak current to impact.
In one preferred embodiment, time delay elements comprises diode D1, resistance R1, resistance R2 and electric capacity C1, wherein, the positive pole of diode D1 is connected with power factor correction unit, more specifically, be be connected with the signal output part of power factor correction unit, the control signal that power factor correction unit is sent all is sent to this diode D1.Resistance R1 is connected with the negative pole of diode D1, and then, resistance R2 is in parallel with electric capacity C1 forms a RC circuit, and is connected with resistance R1, and resistance R1 is connected between diode D1 and this RC circuit.This RC circuit carries out filtering process to the control signal that diode D1 receives, and specific works principle is: R1 is for limiting the charging current of C1, and R2 is used for the electric discharge to C1.The resistance of R1 determines charging current; Charging current is large, and delay time is short, otherwise charging current is little, and delay time is long.The resistance of R2 then determines the size of discharging current; Discharging current is large, and delay time is long, otherwise discharging current is little, 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, such as, adopts reception and the transmission timing of the Single-chip Controlling control signal be connected between driver element and power factor correction unit, can play above-mentioned delay effect equally.
Alternatively or preferably, power factor correction unit includes: electric capacity C2, controller and auxiliary winding T1, electric capacity C2 is connected with external power source, and for receiving electric power and slowly charging, it is connected with the input Vcc of controller, and electric power is forwarded to controller.During specific works, after external ac power source AC input, voltage after rectification charges to electric capacity C2, owing to have employed the configuration of electric capacity C2, only have when electric capacity C2 charges to the startup threshold value of controller, power factor correction unit just can be started working, and in advance power factor correction unit is served to the effect of soft start.Similarly, circuit of power factor correction also comprises resistance R2, is connected in parallel on electric capacity C2 two ends, for the size of the charging current of limiting capacitance C2, form another RC circuit, filtering is carried out to the signal after process, meanwhile, as above, also certain delay effect can be played.In one embodiment, this startup threshold value is 12.5V.Auxiliary winding T1 is connected with electric capacity C2 by diode, wherein, diode is that the electric current of this auxiliary winding T1 of input carries out rectification, electric capacity C2 is energy storage and filter action, its energy stored can provide electric energy for controller, auxiliary winding T1 is connected to ZCD end (zero passage detection end) of controller subsequently, and auxiliary winding T1 is to controller pulse control signal, and its concrete occupation mode can regulate according to practical application.
Consult Fig. 1 and Fig. 2, in two embodiments, auxiliary winding T1 has different operating states.First Fig. 1 is consulted, for the circuit diagram of LED drive power start-up circuit in first embodiment of the invention, in this embodiment, auxiliary winding T1 is the application producing control signal, it outwards exports control signal by an output (being A end in Fig. 1), wherein output is held with the ZCD of controller and is connected, and is connected with time delay elements.The control signal of output is sent to time delay elements, is processed by time delay elements.Continue to consult Fig. 2, for the circuit diagram of LED drive power start-up circuit in second embodiment of the invention, in this embodiment, auxiliary winding T1 is for providing the application of electric energy to controller, in this embodiment, control signal is produced by the PFC chip in controller, a field effect transistor Q1 is also comprised in power factor correction unit, this field effect transistor Q1 one end holds (output) to be connected with the GD of controller, and the other end is connected with current sampling resistor. and the output (for B holds in figure) that control signal is then passed through between the GD end of controller and field effect transistor Q1 sends to time delay elements.The mode producing control signal in above-mentioned two embodiments can be replaced according to actual conditions, all can use.
In above-mentioned any embodiment, control signal is the signal that auxiliary winding T1 or controller output end export, and is specially square-wave signal.
Alternatively or preferably, driver element includes a self-maintained circuit, this self-maintained circuit comprises a switching tube Q2, and its base stage is connected with time delay elements, and collector electrode is then connected with external loading, grounded emitter.This self-maintained circuit is RCC self-maintained circuit, and after receiving the enabling signal that time delay elements sends, switching tube Q2 is biased to be started, thus plays the object of the startup sequential changing driver element and time delay elements.As described above, in self-maintained circuit, also multiple resistance can be set and electric capacity forms RC circuit, by the size of current of the discharge and recharge of resistance control capacitance, make each element circuit in this LED drive power start-up circuit all have the function of soft start, avoid the destruction of peak current to electronic component.
In above-described embodiment, the selection of driver element is not limited only to self-maintained circuit, and other and power factor correction unit start the different circuit of sequential such as constant-current type drive circuit and all can use in this embodiment.
Consult Fig. 3, the invention also discloses a kind of starting method of LED drive power, first, circuit of power factor correction starts, then it sends one and controls signal to a time delay elements, transfers to time delay elements to carry out filtering and delay process to this control signal, also can play the effect of time delay simultaneously.After being disposed, time delay elements sends enabling signal to driver element, only after driver element receives this enabling signal, and driver element startup work.
Adopt after technique scheme, the startup of driver element is limited to the startup of power factor correction unit, and due to the effect of time delay elements, has delayed the start-up time of driver element, avoided driver element and start separately instantaneously to the heavy current impact of LED.
Should be noted that, embodiments of the invention have preferably implementation, and not any type of restriction is done to the present invention, any person skilled in art of being familiar with may utilize the technology contents of above-mentioned announcement change or be modified to equivalent effective embodiment, in every case the content of technical solution of the present invention is not departed from, the any amendment done above embodiment according to technical spirit of the present invention or equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. a LED drive power start-up circuit, comprises driver element and power factor correction unit;
Described power factor correction unit is connected with described driver element, it is characterized in that:
Described LED drive power start-up circuit also comprises a time delay elements, is connected between described driver element and power factor correction unit;
Described power factor correction unit produces a control signal and is sent to described time delay elements;
Control signal described in described time delay elements process, and produce an enabling signal to described driver element;
Described driver element starts after receiving described enabling signal.
2. LED drive power start-up circuit as claimed in claim 1, is characterized in that:
Described time delay elements, comprises diode D1, resistance R1, resistance R2 and electric capacity C1,
Described diode D1 is connected with described power factor correction unit, for receiving described control signal;
Described resistance R2 is in parallel with electric capacity C1 forms a RC circuit;
Described resistance R1 is connected between described diode D1 and described RC circuit.
3. LED drive power start-up circuit as claimed in claim 1, is characterized in that:
Described power factor correction unit comprises: electric capacity C2, controller and auxiliary winding T1;
Described electric capacity C2 is connected with the input of described controller, and described auxiliary winding T1 holds with the ZCD of described controller and is connected;
When described electric capacity C2 charges to the startup threshold value of described controller, described power factor correction unit work.
4. LED drive power start-up circuit as claimed in claim 3, is characterized in that:
Described auxiliary winding T1 produces described control signal.
5. LED drive power start-up circuit as claimed in claim 3, is characterized in that:
Described Power Correction Factor unit also comprises a field effect transistor Q1;
Described field effect transistor Q1 holds with the GD of described controller and is connected;
Described GD end produces described control signal.
6. the LED drive power start-up circuit as described in any one of claim 3-5, is characterized in that:
Described control signal is square-wave signal.
7. the LED drive power start-up circuit as described in any one of claim 3-5, is characterized in that:
Described startup threshold value is 12.5V.
8. LED drive power start-up circuit as claimed in claim 1, is characterized in that:
Described driver element comprises: self-maintained circuit or constant-current type drive circuit.
9. LED drive power start-up circuit as claimed in claim 8, is characterized in that:
Described self-maintained circuit comprises switching tube Q2;
The base stage of described switching tube Q2 is connected with described time delay elements, and collector electrode is connected with external loading, grounded emitter.
10. a LED drive power starting method, comprising:
Starting power factor correcting unit;
Described power factor correction unit sends a control signal to a time delay elements;
Control signal described in described time delay elements process, and send an enabling signal to driver element;
Start described driver element.
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 true CN105282901A (en) | 2016-01-27 |
| CN105282901B CN105282901B (en) | 2019-01-04 |
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| 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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| JPH11332220A (en) * | 1998-05-18 | 1999-11-30 | Sony Corp | Dc power supply circuit |
| 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 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11332220A (en) * | 1998-05-18 | 1999-11-30 | Sony Corp | Dc power supply circuit |
| 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 |
|---|---|
| WO2015192576A1 (en) | 2015-12-23 |
| CN105282901B (en) | 2019-01-04 |
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