CN207783206U - Led drive device - Google Patents
Led drive device Download PDFInfo
- Publication number
- CN207783206U CN207783206U CN201721763101.XU CN201721763101U CN207783206U CN 207783206 U CN207783206 U CN 207783206U CN 201721763101 U CN201721763101 U CN 201721763101U CN 207783206 U CN207783206 U CN 207783206U
- Authority
- CN
- China
- Prior art keywords
- module
- voltage
- drive device
- led drive
- light modulator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
This application discloses LED drive devices.The LED drive device includes：Rectifier bridge, for by AC-input voltage rectification to obtain DC bus-bar voltage；Adjustment module adjusts voltage for default；Control module is connect with light modulator and the adjustment module, and generates switch control signal according to the dim signal of the light modulator and the adjusting voltage of the adjustment module；And power conversion module, it is connected with the control module, for the DC bus-bar voltage to be converted into direct-flow output signal according to the switch control signal, wherein, the power conversion module controls electric energy transmission according to the switch control signal, to adjust the brightness of the LED light.The preconditioning of dimming curve may be implemented in the LED drive device.
Description
Technical field
The utility model is related to light source control technologies, more particularly, to LED drive device.
Background technology
When light emitting diode (light-emitting diode, LED) is used for lighting area, using LED light modulating devices
Brightness is adjusted to meet the individual demand of user or need to dim to reduce energy consumption according to environment.Using LED light modulating devices
Brightness and the colour temperature that LED can be adjusted, to reach the demand of user.
LED light modulating devices are for example, by using traditional controllable silicon dimmer.However, controllable silicon dimmer, which exists, maintains electric current one
The problem of cause property differs, and there is also differences for the product of every country, each brand, are susceptible to asking for light modulator compatibility
Topic.In addition, phenomena such as there is also flicker in dimming process.Further improved LED light modulating devices use power modulus of conversion
Block provides DC output voltage, and the electric current realization light modulation of LED light is flowed through by changing.Power conversion module is adapted to wide scope
Supply voltage and stable electric current is provided, and intelligent dimming may be implemented, therefore be widely used.
Fig. 1 shows the schematic block diagram of LED light adjusting systems according to prior art.The LED light adjusting systems include light modulator
110, LED drive device 120 and LED light 130.Light modulator 110 generates dim signal Vadj depending on the user's operation.LED drives
Device 120 changes the size of output current or effective lighting time according to dim signal Vadj.LED light 130 turns as power
The load for changing the mold block, is connected between two output ends of LED drive device 120.LED drive device 120 includes rectifier bridge
121, power conversion module 122 and control module 124.The rectifier bridge 121 obtains AC-input voltage from utility grid, and passes through
Over commutation obtains DC bus-bar voltage.DC bus-bar voltage is converted further into DC output voltage by power conversion module 122.
Control module 124 receives dim signal Vadj, and control signal is further generated according to dim signal.Power conversion module 122 exists
It controls and adjusts any one of output voltage, output current and duty ratio under the control of signal.Due to output voltage, output current
With the variation of any one of duty ratio, the brightness of LED, color can change.
In LED light adjusting systems, light modulator 110 be, for example, selected from the active light modulators of 0-10V, the passive light modulators of 0-10V and
Any one of PWM light modulators.Active light modulator and passive light modulator are using voltage magnitude characterization light modulation data, PWM light modulators
Light modulation data are characterized using duty ratio.Existing light modulator 110 can provide the dimming function having good stability.
However, in actual product, light modulator and LED drive device are independent module respectively.It is expected that further changing
Into the suitability of light modulator and LED drive device, and reduce the quantity of peripheral components.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of LED drive devices, wherein carried using adjustment module
For additional Regulate signal to realize the preconditioning of dimming curve, and Voltage stabilizing module is used to reduce peripheral components.
According to the utility model, a kind of LED drive device is provided, including：Rectifier bridge is used for AC-input voltage rectification
To obtain DC bus-bar voltage；Adjustment module adjusts voltage for default；Control module, with light modulator and the adjustment module
Connection, and switch control signal is generated according to the dim signal of the light modulator and the adjusting voltage of the adjustment module；With
And power conversion module, it is connected with the control module, for according to the switch control signal that the DC bus is electric
Pressure is converted into direct-flow output signal, wherein and the power conversion module controls electric energy according to the switch control signal and transmits, from
And adjust the brightness of the LED light.
Preferably, the adjustment module includes potentiometer, and the potentiometer is connected with current source, and according to potentiometer
Resistance change generate the adjusting voltage.
Preferably, the adjustment module includes the resistance and potentiometer being connected in series between supply voltage and ground, according to
The resistance change of potentiometer generates the adjusting voltage in the intermediate node of the resistance and the potentiometer.
Preferably, further include Voltage stabilizing module, be connected to provide supply voltage with the control module.
Preferably, the Voltage stabilizing module is used for external module for power supply.
Preferably, the power conversion module has booster type topology, buck topology, buck-boost type topology and inverse-excitation type
Any one of topology.
Preferably, the power conversion module includes transformer and switching tube, the different name of the primary side winding of the transformer
End is connected to the hot end of the rectifier bridge, and Same Name of Ends is connected to the cold end of the rectifier bridge via the switching tube,
The switch control signal is used to control the conducting state of the switching tube.
Preferably, the light modulator includes selected from any one of active light modulator, passive light modulator and PWM light modulators.
According to the LED drive device of the utility model embodiment, including adjustment module, voltage is adjusted with default for generating
The characteristic of dimming curve.Brightness is carried out according to the dim signal of light modulator and the adjusting voltage of adjustment module jointly in working condition
Control.The adjustment module can meet user and specifically dim demand.
In a preferred embodiment, which includes Voltage stabilizing module, so as to improve the suitability with light modulator,
It is convenient to be connect with external module, reduce peripheral components.
Description of the drawings
By referring to the drawings to the description of the utility model embodiment, above-mentioned and other mesh of the utility model
, feature and advantage will be apparent from.
Fig. 1 shows the schematic block diagram of LED light adjusting systems according to prior art.
Fig. 2 shows the schematic block diagrams according to the LED light adjusting systems of the utility model embodiment.
Fig. 3 shows the schematic block diagram of power conversion module in Fig. 2.
Fig. 4 a and 4b show the schematic circuit of adjustment module in Fig. 2.
Fig. 5 shows the dim signal of LED drive device according to the ... of the embodiment of the present invention and the relationship song of switch control signal
Line.
Specific implementation mode
Hereinafter reference will be made to the drawings is more fully described the utility model.In various figures, identical element is using similar
Reference numeral indicate.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.Furthermore, it is possible to be not shown
Certain well known parts.
Many specific details of the utility model, such as the structure of device, material, size, place are described hereinafter
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 be presented in a variety of manners, some of them example explained below.
Fig. 2 shows the schematic block diagrams according to the LED light adjusting systems of the utility model embodiment.The LED light adjusting system packets
Include light modulator 110, LED drive device 220 and LED light 130.
Light modulator 110 generates dim signal Vadj depending on the user's operation.LED drive device 220 is according to dim signal
Vadj changes the size of output current or effective lighting time.Load of the LED light 130 as power conversion module, is connected to
Between two output ends of LED drive device 220.LED drive device 220 include rectifier bridge 121, power conversion module 122, with
And control module 124.The rectifier bridge 121 obtains AC-input voltage from utility grid, and obtains DC bus through over commutation
Voltage.DC bus-bar voltage is converted further into DC output voltage by power conversion module 122.Power conversion module 122 exists
Any one of output voltage, output current and duty ratio are adjusted under the control of switch control signal Vg.Due to output voltage, defeated
Go out the variation of any one of electric current and duty ratio, the brightness of LED, color can change.
In this embodiment, LED drive device 220 includes additional Voltage stabilizing module 125 and adjustment module 126.
The Voltage stabilizing module 125 is, for example, low pressure difference linearity Voltage stabilizing module (LDO), for the inside for LED drive device 220
Module and external module power supply.For example, the control module 124 inside the LED drive device 220 and LED drive device 220
External communication module, such as bluetooth, WIFI, ZIGBEE module.The Voltage stabilizing module 125 can provide stable supply voltage,
Control module 124 is allow to maintain steady operation without being interfered by dim signal.Further, the Voltage stabilizing module
125 can be also used for powering for external module, to save independent power supply circuit, reduce peripheral components and reduce LED tune
The volume of photosystem.
The adjustment module 126 provides adjustings of the additional adjusting voltage V1 to realize dimming curve.124 basis of control module
Come both the dim signal Vadj of dimmer 110 and the adjusting voltage V1 from adjustment module 126 and generates switch control signal
Vg so that for dimming in real time, the adjusting voltage V1 of adjustment module 126 is adjusted the dim signal Vadj of light modulator 110 for default
The characteristic of light curve.
Fig. 3 shows the schematic block diagram of power conversion module in Fig. 2.Power conversion module 122 is used for DC bus electricity
Pressure is converted further into DC output voltage.As shown, power conversion module 122 includes transformer T, switching tube Q1, driving
101 sustained diode of module and output capacitance Cout.
The topological structure of flyback power inverter is shown in FIG. 3.In power conversion module 122, the original of transformer T
Side winding receives DC bus-bar voltage Vbus, that is, the hot end of the different name end connection rectifier bridge 121 of primary side winding, Same Name of Ends
The cold end of rectifier bridge 121 is connected to via switching tube Q1.The vice-side winding of transformer T and sustained diode and LED light
130 form current supply circuit, that is, the Same Name of Ends of vice-side winding is connected to the anode of sustained diode, and different name end is connected to LED light
130 cathode.Further, output capacitance Cout is connected between the cathode of sustained diode and ground.
During operation, when switching tube Q1 is connected, DC bus-bar voltage is applied in the primary side winding of transformer T, stream
The electric current for crossing primary side winding is linearly increasing so that transformer T stores energy.When switching tube Q1 is turned off, the electric current of primary side winding
It is not formed into a loop and sports zero, the vice-side winding afterflow of transformer T fills output capacitance Cout via sustained diode
Electricity flows through the electric current linear decline of vice-side winding.Switching tube Q1 alternate conductions and shutdown, to be produced at the both ends output capacitance Cout
Raw DC output voltage Vout so that LED light 130 is lighted.Control module 124 shown in figure 2 is for generating switch control
Signal Vg generates drive signal Vctrl, to control the conducting state of switching tube Q1 via drive module 101.
In the above-described embodiment, power conversion module has reverse exciting topological.In alternate embodiments, power is converted
Module has any one of booster type topology, buck topology, buck-boost type topology and reverse exciting topological.
Fig. 4 a and 4b show the schematic circuit of adjustment module in Fig. 2.Adjustment module 126 and 226 provide respectively it is additional
Adjusting voltage V1 to realize the adjusting of dimming curve.
As shown in fig. 4 a, in adjustment module 126, potentiometer R1 first ends link control module 124, potentiometer R1 second
End ground connection.Current source I1 should be provided inside control module 124 and give potentiometer R1, by the variation of the resistance value of potentiometer R1,
It generates and adjusts voltage V1.
As shown in Figure 4 b, in adjustment module 226, resistance R2 and potentiometer R3 are connected in series in supply voltage VCC and ground
Between, constitute potential-divider network, the resistance change of potentiometer R3 leads to adjust voltage V1 changing, and by resistance R2 and
The intermediate node of potentiometer R3 is supplied to control module 124 by voltage V1 is adjusted.
Control module 124 is according to the dim signal Vadj for carrying out dimmer 110 and the tune from adjustment module 126 or 226
It saves both voltage V1 and generates switch control signal Vg so that the dim signal Vadj of light modulator 110 adjusts mould for dimming in real time
The adjusting voltage V1 of block 126 is used to preset the characteristic of dimming curve.
Fig. 5 shows the dim signal of LED drive device according to the ... of the embodiment of the present invention and the relationship song of switch control signal
Line.In this embodiment, dim signal Vadj is the d. c. voltage signal using 0-10V direct current light modulators.
As described above, control module receives dim signal Vadj, switch control is further generated according to dim signal Vadj
Signal Vg.Power conversion module 122 is adjusted under the control of switch control signal Vg in output voltage, output current and duty ratio
At least one.In this embodiment, switch control signal Vg is the pulse-width signal that control module 124 generates.
In this embodiment, dim signal Vadj is d. c. voltage signal, and amplitude is consistent with light modulation data.Control mould
Dim signal Vadj is converted into pulse-width signal by block 124, to generate switch control signal Vg, such as the solid line institute in figure
Show.When the amplitude of dim signal Vadj is less than 1V, the duty ratio of switch control signal Vg is, for example, scheduled minimum duty cycle,
Such as 5%.Dim signal Vadj amplitude be more than or equal to 1V and less than or equal to 9V when, the duty ratio of switch control signal Vg with
The amplitude of dim signal Vadj is directly proportional.When the amplitude of dim signal Vadj is more than 9V, the duty ratio of switch control signal Vg
For example, scheduled saturation duty ratio, such as 100%.
Adjustment module 126 provides additional adjusting voltage V1 to realize the adjusting of dimming curve.Control module 124 is according to next
Both dim signal Vadj of dimmer 110 and adjusting voltage V1 from adjustment module 126 generate switch control signal Vg.
For example, in this embodiment, slopes of the voltage V1 for changing relation curve will be adjusted so that light modulation variation is more rapidly or more slow
Slowly, as shown in broken lines.Thus, the adjusting voltage V1 of adjustment module 126 is used to preset the characteristic of dimming curve.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion so that the process, method, article or equipment including a series of elements includes not only those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or equipment institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including institute
State in the process, method, article or equipment of element that there is also other identical elements.
It is as described above according to the embodiments of the present invention, these embodiments there is no all details of detailed descriptionthe,
The specific embodiment that the utility model is only described is not limited yet.Obviously, as described above, many modification and change can be made
Change.These embodiments are chosen and specifically described to this specification, is in order to preferably explain the principles of the present invention and actually to answer
With to enable skilled artisan to utilize the utility model and repairing on the basis of the utility model well
Change use.The utility model is limited only by the claims and their full scope and equivalents.
Claims (8)
1. a kind of LED drive device, which is characterized in that including：
Rectifier bridge, for by AC-input voltage rectification to obtain DC bus-bar voltage；
Adjustment module adjusts voltage for default；
Control module is connect with light modulator and the adjustment module, and the dim signal according to the light modulator and the tune
The adjusting voltage for saving module generates switch control signal；And
Power conversion module is connected with the control module, for according to the switch control signal by the DC bus
Voltage is converted into direct-flow output signal,
The power conversion module controls electric energy transmission according to the switch control signal, to adjust the brightness of the LED light.
2. LED drive device according to claim 1, which is characterized in that the adjustment module includes potentiometer, the electricity
Position device is connected with current source, and generates the adjusting voltage according to the resistance change of potentiometer.
3. LED drive device according to claim 1, which is characterized in that the adjustment module includes being connected in series in confession
Resistance between piezoelectric voltage and ground and potentiometer, according to the resistance change of potentiometer, in the resistance and the potentiometer
Intermediate node generates the adjusting voltage.
4. LED drive device according to claim 1, which is characterized in that further include Voltage stabilizing module, with the control module
It is connected to provide supply voltage.
5. LED drive device according to claim 4, which is characterized in that the Voltage stabilizing module is used to supply to external module
Electricity.
6. LED drive device according to claim 1, which is characterized in that the power conversion module is opened up with booster type
It flutters, buck topology, buck-boost type topology and any one of reverse exciting topological.
7. LED drive device according to claim 6, which is characterized in that the power conversion module include transformer and
Switching tube, the different name end of the primary side winding of the transformer are connected to the hot end of the rectifier bridge, and Same Name of Ends is via described
Switching tube is connected to the cold end of the rectifier bridge, and the switch control signal is used to control the conducting shape of the switching tube
State.
8. LED drive device according to claim 1, which is characterized in that the light modulator include selected from active light modulator,
Any one of passive light modulator and PWM light modulators.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721763101.XU CN207783206U (en) | 2017-12-15 | 2017-12-15 | Led drive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721763101.XU CN207783206U (en) | 2017-12-15 | 2017-12-15 | Led drive device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207783206U true CN207783206U (en) | 2018-08-28 |
Family
ID=63226342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721763101.XU Active CN207783206U (en) | 2017-12-15 | 2017-12-15 | Led drive device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207783206U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110461069A (en) * | 2019-06-06 | 2019-11-15 | 矽力杰半导体技术(杭州)有限公司 | Dim signal generative circuit and method, integrated circuit and LED drive circuit |
-
2017
- 2017-12-15 CN CN201721763101.XU patent/CN207783206U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110461069A (en) * | 2019-06-06 | 2019-11-15 | 矽力杰半导体技术(杭州)有限公司 | Dim signal generative circuit and method, integrated circuit and LED drive circuit |
| CN110461069B (en) * | 2019-06-06 | 2022-07-29 | 矽力杰半导体技术(杭州)有限公司 | Dimming signal generation circuit and method, integrated circuit and LED drive circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107454711B (en) | A kind of multipath LED drive circuit, driving method and LED drive power | |
| CN204244540U (en) | There is light-emitting component power supply circuit and the control circuit wherein of dimming function | |
| CN105101543B (en) | Led drive circuit | |
| US8587205B2 (en) | LED lighting with incandescent lamp color temperature behavior | |
| CN101637065B (en) | Driver circuit for loads such as LED, OLED or laser diodes | |
| CN103857152B (en) | There is the power-supply system of multiple-channel output | |
| CN103298221B (en) | Dimming circuit and method of LED (Light Emitting Diode) lighting lamp | |
| CN107683630A (en) | The multiple output LED drivers of AC DC single inductors | |
| CN102573213B (en) | LED (Light Emitting Diode) dimming system | |
| CN105188232A (en) | LED (light-emitting diode) constant-current drive circuit, constant-current dimming circuit and control method of LED (light-emitting diode) constant-current dimming circuit | |
| RU2009145107A (en) | DEVICE AND WAYS OF LIGHTING ON THE BASIS OF LED WITH HIGH POWER FACTOR | |
| CN103997812A (en) | LED driving device and LED lighting apparatus | |
| CN101836505A (en) | LED dimming apparatus | |
| CN102036442A (en) | Lighting circuit and light source apparatus having the lighting circuit | |
| CN103748965A (en) | Controlling the light output of one or more LEDs in response to the output of a dimmer | |
| CN102421230A (en) | Color adjusting driver for LED (Light-Emitting Diode) lamp | |
| CN101742766A (en) | LED light dimming method and device | |
| CN108024415A (en) | Dim modular converter, LED drive device and its control method | |
| CN110708803A (en) | Light and color temperature adjusting circuit and lighting device | |
| CN103561528A (en) | LED power source platform capable of integrating various dimming ways | |
| CN207783206U (en) | Led drive device | |
| CN104467424B (en) | Switching Power Supply for display panel | |
| CN102316647A (en) | LED lamp color temperature adjusting driver | |
| Shagerdmootaab et al. | A double-loop primary-side control structure for HB-LED power regulation | |
| CN207283875U (en) | A kind of power conditioning circuitry and LED light driving device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |