CN205961514U - Led actuating device - Google Patents
Led actuating device Download PDFInfo
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- CN205961514U CN205961514U CN201620781753.5U CN201620781753U CN205961514U CN 205961514 U CN205961514 U CN 205961514U CN 201620781753 U CN201620781753 U CN 201620781753U CN 205961514 U CN205961514 U CN 205961514U
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- led
- output
- drive device
- conversion module
- power conversion
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Abstract
The utility model discloses a led actuating device. Led actuating device includes: power conversion module for convert direct current busbar voltage to direct current output voltage, output capacitance connects between power conversion module's first output and second output for carry out filtering to direct current output voltage, at least one LED lamp is connected between power conversion module's first output and second output, the bleeder circuit is connected between power conversion module's first output and second output, and LED control circuit, be connected to the bleeder circuit, according to direct current busbar voltage production discharge control signal, wherein, the bleeder circuit communicates when system power interruption, makes the electric charge release of the last storage of output capacitance. This led actuating device can eliminate the flashing light phenomenon and improve the illuminating effect.
Description
Technical field
The utility model is related to light source control technology, more particularly, to LED drive device.
Background technology
Light emitting diode (light-emitting diode, LED) has been widely used in lighting field.Due to LED
Brightness related to the electric current flowing through, therefore, LED drive device adopt power conversion module provide constant current.Further,
LED drive device passes through the LED that is periodically turned on or off, or the size of change output current, can adjust LED
Brightness, to meet the individual demand of user or according to the light modulation of environment needs with reducing energy consumption.
Fig. 1 illustrates the schematic block diagram of the LED drive device according to prior art.This LED drive device include switch K1,
Rectifier bridge BD1, power conversion module 110, LED control circuit 120, electric capacity Co, LED D1 and LED D2 and switching tube Q1
With switching tube Q2.Switching tube Q1 and switching tube Q2 is connected in series with LED D1 and LED D2 respectively.
The first input end of rectifier bridge BD1 connects phase line L to utility grid via switch K1, and the second input connects
Zero line N to utility grid.First output end of rectifier bridge BD1 and the second output end are used for providing DC bus-bar voltage
Vbus.
DC bus-bar voltage is converted into constant VD by power conversion module 110.Electric capacity Co is connected to work(
Between two output ends of rate modular converter 110, for being filtered to VD.LED D1 is gone here and there with switching tube Q1
Connection connects between the two outputs, and LED D2 and switching tube Q2 are connected in series between two output ends.LED control circuit 120
Produce switch controlling signal PWM1 and PWM2 for controlling switch pipe Q1 and Q2, be periodically turned on or off LED, thus
By duty cycle adjustment LED D1 of switch controlling signal and the brightness of D2.
In this LED drive device, if system cut-off, switch K1 disconnects, then AC-input voltage disconnects.LED drives
Switch controlling signal PWM1 and PWM2 that LED control circuit 102 in device produces from be efficiently translated into invalid so that switching tube
Q1 and Q2 disconnects immediately.However, LED D1 and D2 are due to the very slow electrology characteristic of the velocity of discharge, the electric charge of output capacitance storage
Will be unable to discharge.
In upper once system electrification, switch K1 closure, AC-input voltage turns on.LED in LED drive device controls
Circuit 102 re-powers, and produces switch controlling signal PWM1 and PWM2 so that switching tube Q1 and Q2 turns on again.Output capacitance
The electric charge of storage will discharge so that LED D1 and D2 light immediately.Start from invalid turn in switch controlling signal PWM1 and PWM2
When being changed into effective, power conversion module 110 cannot charge to output capacitance, needs to wait some time just to be provided that energy, institute
Arise that the first bright rear dark bright more this situation of LED, i.e. flashing light to re-power.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of LED drive device, wherein, is released using leadage circuit
Put the electric charge of storage in output capacitance, such that it is able to eliminating flashing light phenomenon and improving illuminating effect.
According to the utility model, provide a kind of LED drive device it is characterised in that including power conversion module, for inciting somebody to action
DC bus-bar voltage is converted into VD；Output capacitance, is connected to first output end and second of power conversion module
Between output end, for being filtered to VD；At least one LED, is connected to the first of power conversion module
Between output end and the second output end；Leadage circuit, be connected to the first output end of power conversion module and the second output end it
Between；And LED control circuit, connect to leadage circuit, control signal of releasing is produced according to DC bus-bar voltage, wherein, described
Leadage circuit connects in system cut-off so that the electric charge of storage discharges in described output capacitance.
Preferably, described leadage circuit includes the first resistor being connected in series and first switch pipe, described control letter of releasing
Number for controlling being turned on or off of first switch pipe.
Preferably, described LED control circuit includes test side, for obtaining AC-input voltage, DC bus-bar voltage, straight
At least one of stream output voltage, to judge the generation of system cut-off.
Preferably, described test side connects to described power conversion module via optocoupler.
Preferably, the test side of described LED control circuit connects second resistance for current limliting.
Preferably, also include：At least one second switch pipe, is connected in series with least one LED described respectively.
Preferably, described control circuit produces at least one switch controlling signal, for control respectively described at least one
Being turned on or off of second switch pipe.
Preferably, also include：Rectifier bridge, wherein, the first input end of described rectifier bridge connects to civil power electricity via switch
Phase line in net, the second input connects the zero line to utility grid, the first output end of described rectifier bridge and the second output
Hold for providing DC bus-bar voltage.
According to the LED drive device of the utility model embodiment, in system cut-off, leadage circuit connection is so that described
The electric charge release of storage in output capacitance.When system re-powers, the electric charge due to storage in output capacitance has discharged,
LED will not be lighted immediately.Power conversion module gradually charges to output capacitance, so when re-powering, the slow point of LED
Bright, without flashing light phenomenon occurs.Therefore, this LED drive device can eliminate flashing light phenomenon and improve illuminating effect.
Brief description
By the description to the utility model embodiment referring to the drawings, of the present utility model above-mentioned and other mesh
, feature and advantage will be apparent from, in the accompanying drawings：
Fig. 1 illustrates the schematic block diagram of the LED drive device according to prior art；
Fig. 2 illustrates the schematic block diagram of the LED drive device according to the utility model embodiment.
Specific embodiment
It is more fully described the utility model hereinafter with reference to accompanying drawing.In various figures, identical element is using similar
Reference representing.For the sake of clarity, the various pieces in accompanying drawing are not necessarily to scale.Furthermore, it is possible to it is not shown
Some known parts.
Describe hereinafter many specific details of the present utility model, the structure of such as device, material, size, place
Science and engineering skill and technology, to be more clearly understood that the utility model.But just as the skilled person will understand,
The utility model can not be realized according to these specific details.
The utility model can present in a variety of manners, some of them example explained below.
Fig. 2 illustrates the schematic block diagram of the LED drive device according to the utility model embodiment.
This LED drive device includes switching K1, rectifier bridge BD1, power conversion module 110, LED control circuit 120, electric capacity
Co, LED D1 and LED D2 and switching tube Q1 and switching tube Q2.Switching tube Q1 and switching tube Q2 respectively with LED D1 and
LED D2 is connected in series.
The first input end of rectifier bridge BD1 connects phase line L to utility grid via switch K1, and the second input connects
Zero line N to utility grid.First output end of rectifier bridge BD1 and the second output end are used for providing DC bus-bar voltage
Vbus.
DC bus-bar voltage is converted into constant VD by power conversion module 110.Electric capacity Co is connected to work(
Between two output ends of rate modular converter 110, for being filtered to VD.LED D1 is gone here and there with switching tube Q1
Connection connects between the two outputs, and LED D2 and switching tube Q2 are connected in series between two output ends.LED control circuit 120
Produce switch controlling signal PWM1 and PWM2 for controlling switch pipe Q1 and Q2, be periodically turned on or off LED, thus
By duty cycle adjustment LED D1 of switch controlling signal and the brightness of D2.
It is with the difference of the LED drive device shown in Fig. 1, the LED according to the utility model embodiment drives dress
Put and also include leadage circuit.This leadage circuit for example includes being connected in series between two output ends of power conversion module 110
Resistance R1 and switching tube Q3.
LED control module 120 includes connection to the test side of the output end of rectifier bridge BD1, to obtain DC bus-bar voltage
Vbus.Preferably, resistance R2 is connected on this test side to limit the size of detection electric current.It is defeated that this test side is used for acquisition exchange
Enter at least one of voltage, DC bus-bar voltage, VD, to judge the generation of system cut-off.Preferably real
Apply in example, test side connects via optocoupler to the input of power conversion module 110, thus detecting DC bus-bar voltage, and
Realize the electric isolution between main circuit and control circuit.LED control module 120 not only produces above-mentioned switch controlling signal PWM1
And PWM2, but also produce control signal BLEED of releasing, for being turned on or off of controlling switch pipe Q3.
During the normal work of LED drive device, LED control circuit 120 DC bus-bar voltage Vbus is detected so that
Control signal BLEED of releasing is disarmed state.
In the system cut-off of LED drive device, switch K1 disconnects, then AC-input voltage disconnects.In LED drive device
Switch controlling signal PWM1 and PWM2 that produce of LED control circuit 102 from be efficiently translated into invalid so that switching tube Q1 and Q2
Disconnect immediately.LED control circuit 120 is not detected by DC bus-bar voltage Vbus so that control signal BLEED of releasing is effective shape
State.The electric charge of output capacitance Vo storage discharges via resistance R1 and switching tube Q3.Due to the presence of leadage circuit, in system cut-off
When, the non-stored charge of output capacitance Vo.
In upper once system electrification, switch K1 closure, AC-input voltage turns on.LED in LED drive device controls
Circuit 102 re-powers, and produces switch controlling signal PWM1 and PWM2 so that switching tube Q1 and Q2 turns on again.Due to output
The electric charge of capacitive storage has discharged in system cut-off, and therefore LED D1 and D2 will not light immediately.In switch controlling signal
PWM1 and PWM2 start from invalid be changed into effective when, power conversion module 110 gradually to output capacitance charge, so again going up
When electric, LED is slowly lighted, without flashing light phenomenon.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation are made a distinction with another entity or operation, and not necessarily require or imply these entities or deposit between operating
In any this actual relation or order.And, term " inclusion ", "comprising" or its any other variant are intended to
Comprising of nonexcludability, wants so that including a series of process of key elements, method, article or equipment and not only including those
Element, but also include other key elements being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element that limited by sentence "including a ..." it is not excluded that
Also there is other identical element including in the process of described key element, method, article or equipment.
According to embodiment of the present utility model as described above, these embodiments do not have all of details of detailed descriptionthe,
Do not limit the specific embodiment that this utility model is only described yet.Obviously, as described above, a lot of modifications and change can be made
Change.This specification is chosen and is specifically described these embodiments, is to preferably explain that principle of the present utility model and reality should
With so that skilled artisan can be well using the utility model and repairing on the basis of the utility model
Change use.The utility model is only limited by claims and its four corner and equivalent.
Claims (8)
1. a kind of LED drive device is it is characterised in that include
Power conversion module, for being converted into VD by DC bus-bar voltage；
Output capacitance, is connected between the first output end of power conversion module and the second output end, for direct current output electricity
Pressure is filtered；
At least one LED, is connected between the first output end of power conversion module and the second output end；
Leadage circuit, is connected between the first output end of power conversion module and the second output end；And
LED control circuit, connects to leadage circuit, produces, according to DC bus-bar voltage, control signal of releasing,
Wherein, described leadage circuit connects in system cut-off so that the electric charge of storage discharges in described output capacitance.
2. LED drive device according to claim 1 is it is characterised in that described leadage circuit includes being connected in series
One resistance and first switch pipe, described control signal of releasing is for controlling being turned on or off of first switch pipe.
3. LED drive device according to claim 1, it is characterised in that described LED control circuit includes test side, is used
In obtaining at least one of AC-input voltage, DC bus-bar voltage, VD, to judge sending out of system cut-off
Raw.
4. LED drive device according to claim 3 is it is characterised in that described test side connects to described via optocoupler
Power conversion module.
5. LED drive device according to claim 3 is it is characterised in that the test side of described LED control circuit connects the
Two resistance are used for current limliting.
6. LED drive device according to claim 1 is it is characterised in that also include：At least one second switch pipe, point
It is not connected in series with least one LED described.
7. LED drive device according to claim 5 is it is characterised in that described control circuit produces at least one switch
Control signal, for controlling being turned on or off of at least one second switch pipe described respectively.
8. LED drive device according to claim 1 is it is characterised in that also include：
Rectifier bridge, wherein, the first input end phase line to utility grid, second input via switch connection of described rectifier bridge
End connects the zero line to utility grid, and the first output end of described rectifier bridge and the second output end are used for providing dc bus electricity
Pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620781753.5U CN205961514U (en) | 2016-07-20 | 2016-07-20 | Led actuating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620781753.5U CN205961514U (en) | 2016-07-20 | 2016-07-20 | Led actuating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205961514U true CN205961514U (en) | 2017-02-15 |
Family
ID=57971319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620781753.5U Active CN205961514U (en) | 2016-07-20 | 2016-07-20 | Led actuating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205961514U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110493933A (en) * | 2019-09-26 | 2019-11-22 | 青岛亿联客信息技术有限公司 | A kind of lighting device |
| CN113964919A (en) * | 2021-11-18 | 2022-01-21 | 阳光电源股份有限公司 | Discharging circuit and discharging method of charging module |
-
2016
- 2016-07-20 CN CN201620781753.5U patent/CN205961514U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110493933A (en) * | 2019-09-26 | 2019-11-22 | 青岛亿联客信息技术有限公司 | A kind of lighting device |
| CN113964919A (en) * | 2021-11-18 | 2022-01-21 | 阳光电源股份有限公司 | Discharging circuit and discharging method of charging module |
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| GR01 | Patent grant |