CN109451631A - A kind of LED drive power light adjusting circuit - Google Patents
A kind of LED drive power light adjusting circuit Download PDFInfo
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- CN109451631A CN109451631A CN201811653543.8A CN201811653543A CN109451631A CN 109451631 A CN109451631 A CN 109451631A CN 201811653543 A CN201811653543 A CN 201811653543A CN 109451631 A CN109451631 A CN 109451631A
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- power
- power inverter
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- inverter
- led drive
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- 230000008054 signal transmission Effects 0.000 claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 8
- 238000002955 isolation Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 8
- 238000004088 simulation Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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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]
- H05B45/10—Controlling the intensity of the light
-
- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of LED drive power light adjusting circuits, including including power input interface, the first changed power device, regulated voltage signal transmission module, the second power inverter, voltage detecting and adjustment module；Power input is sequentially connected the first changed power device, the second power inverter, and PWM dim signal connects the second power inverter；First changed power device, the second power inverter are separately connected voltage detecting and adjustment module；The external LED load of second power inverter；Voltage detecting and adjustment module are sequentially connected regulated voltage signal transmission module, the first changed power device.
Description
Technical field
The present invention relates to a kind of LED drive power light adjusting circuits.
Background technique
Following manner is mainly taken applied to the dimming arrangement of LED drive power at present:
1. simulation light modulation, i.e. output electric current or voltage are with the dim signal consecutive variations of simulation.The advantages of the method
It is that dimming process and power stability do not flash later, the disadvantage is that light modulation is easy to be interfered, dimming scope is narrow, generally in 5%-
In 100% range, flashing is easy to appear lower than 5%；
2. PWM (pulse width modulation) is dimmed, i.e., power conversion modules are controlled with the pulse signal of pulse width modulation,
Make to export electric current or voltage as pwm signal changes.The advantages of the method is that have stronger anti-interference ability, dimming scope compared with
Width, but dimming process can flash in the lesser situation of duty ratio, improve the working frequency and duty ratio of power conversion modules
Help to solve the problems, such as this, but is difficult to improve working frequency, and usual function because device loss is excessive under high-power utilization
The duty ratio of rate converter will not be very big；The duty ratio very little of power inverter and dim signal and when dim signal Ton in
The output of DC/DC controller number of pulses it is less, electric current is exported in dimming process and with the variation of pulse number platform is presented
The reason of variation of rank property causes the flashing of dimming process, generates stroboscopic is referring to figure 3.；
3. PWM+ simulation mixing light modulation, i.e., use PWM+ mould in smaller brightness using simulation light modulation in greater brightness
Quasi- light modulation, this scheme may be implemented wider light modulation depth, can generally accomplish the dimming scope of 1%-100%.This scheme
Control mode is more complicated, and dimming effect is also preferable, but dimming process still will appear flashing in the light modulation depth of very little
The case where；
The above dimming arrangement cannot all accomplish good dimming behavior, especially in the smaller situation of the duty of power inverter
Lower performance is worse.The present invention propose it is a kind of suitable for LED constant pressure light modulation or constant-current dimming new departure, reach dimming scope
1 ‰ even lower light modulation depth and dim flicker free.
Summary of the invention
The present invention is to provide a kind of dimming arrangement using control power inverter pressure difference to overcome disadvantages described above.
To solve the above-mentioned problems, the present invention adopts the following technical scheme that:
A kind of LED drive power light adjusting circuit, including power input interface, the first changed power device, regulated voltage signal
Transmission module, the second power inverter, voltage detecting and adjustment module；
Power input interface is sequentially connected the first changed power device, the second power inverter, PWM dim signal connection second
Power inverter；First changed power device, the second power inverter are separately connected voltage detecting and adjustment module；Second power becomes
The external LED load of parallel operation；Voltage detecting and adjustment module are sequentially connected regulated voltage signal transmission module, the first changed power
Device.
Further, the first changed power device and the second power inverter can be any DC/DC module, including
One or any combined derailing switch in boost, buck, Flyback, LLC, LCC, MOSFET, IGBT, Transistor
Part.
Further, the regulated voltage signal transmission module, which can be, is directly connected to or by optocoupler, transformer
Device with signal transfer functions is constituted；
Further, the voltage detecting can be MCU or amplifier by acquisition pressure difference with adjustment module and export
Control the device of signal；
Further, constant voltage output is carried out using flyback topologies and constitute the first power inverter, constituted using buck topology
Second power inverter constitutes voltage acquisition and adjustment module using amplifier, and is transferred to main primary control instead by optocoupler
Swash the output voltage of topology.
Further, alternating current is by inputting the first power inverter after rectifying and wave-filtering, and the first power inverter includes the
One DC/DC controller, resistance R1 and R2, capacitor C1, diode D1 and D2, MOSFET Q1, transformer T1 and output electrolysis electricity
Hold C2；The voltage detecting and adjustment module includes resistance R4, R5, R6, capacitor C4 and C5, amplifier OP1 and reference voltage
Vref, wherein resistance R5 is connected with the cathode of output to detect the pressure difference of power inverter 2；Voltage detecting and adjustment module are successively
Connect regulated voltage signal transmission module, the first, second DC/DC controller；Second power inverter is controlled including the 2nd DC/DC
Device, MOSFET Q2, diode D3, resistance R7, output capacitance C3 and inductance L1 processed；PWM dim signal and the 2nd DC/DC control
Device connection；Regulated voltage signal transmission module includes resistance R3 and isolation optocoupler U1,
When work, the first changed power device connects input and regulated voltage signal transmission module simultaneously, and output voltage is given
Second power inverter；Second power inverter exports electric current to LED load according to PWM dim signal；Voltage detecting and adjusting
Module connects the second changed power device, and the pressure difference for detecting the second power inverter is controlled by regulated voltage signal transmission module
The output voltage of first power inverter.
It has the advantage that
1. improving dimming behavior by the pressure difference for controlling the first changed power device；
2. the output voltage of changed power device 1 can change according to the requirement of voltage detecting and adjustment module；
3. the second power inverter can adjust output electric current according to pwm signal；
The present invention can achieve very deep light modulation depth and very wide output voltage, and after dimming process and stabilization all
Flicker free；The overall conversion efficiency that power supply can be promoted, especially promotes the efficiency of the second power inverter；
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is circuit module figure of the invention；
Fig. 2 is circuit diagram of the invention；
Fig. 3 is the umber of pulse and output when the drive signal duty cycle of power inverter 2 is lesser when under dimming state
Current waveform；
Fig. 4 is the umber of pulse and output current wave when the drive signal duty cycle of power inverter 2 is larger.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
Embodiment 1:
As shown in Figure 1, a kind of LED drive power light adjusting circuit, including power input interface (being not drawn into figure), the first function
Rate variator 1, regulated voltage signal transmission module 3, the second power inverter 2, voltage detecting and adjustment module 4；
Power input interface is sequentially connected the first changed power device 1, the second power inverter 2, PWM dim signal connection the
Two power inverters 2；First changed power device 1, the second power inverter 2 are separately connected voltage detecting and adjustment module 4；Second
The external LED load of power inverter 2；Voltage detecting and adjustment module 4 are sequentially connected regulated voltage signal transmission module 3, first
Changed power device 1.
When work, the first changed power device connects simultaneously and regulated voltage signal transmission module, and output voltage gives second
Power inverter；Second power inverter exports electric current to LED load according to PWM dim signal；Voltage detecting and adjustment module
The second changed power device is connected, and the pressure difference for detecting the second power inverter passes through regulated voltage signal transmission module control first
The output voltage of power inverter.
Embodiment 2:
Such as Fig. 2, alternating current includes first by inputting the first power inverter, the first power inverter after rectifying and wave-filtering
DC/DC controller, resistance R1 and R2, capacitor C1, diode D1 and D2, MOSFET Q1, transformer T1 and output electrolytic capacitor
C2；The voltage detecting and adjustment module includes resistance R4, R5, R6, capacitor C4 and C5, amplifier OP1 and reference voltage
Vref, wherein resistance R5 is connected with the cathode of output to detect the pressure difference of power inverter 2；Voltage detecting and adjustment module are successively
Connect regulated voltage signal transmission module, the first, second DC/DC controller；Second power inverter is controlled including the 2nd DC/DC
Device, MOSFET Q2, diode D3, resistance R7, output capacitance C3 and inductance L1 processed；PWM dim signal and the 2nd DC/DC control
Device connection；Regulated voltage signal transmission module includes resistance R3 and isolation optocoupler U1.
Such as Fig. 3, for umber of pulse under the dimming state when the drive signal duty cycle of power inverter 2 is lesser when and defeated
Current waveform out in figure is from top to bottom followed successively by 1, PWM dim signal duty ratio, and square wave represents the " light modulation of fixed light modulating frequency
Signal "；2, the drive signal waveform of the second power inverter 2 is from left to right respectively " 3 complete driving pulses " " 2
Complete driving pulse " " 1 complete driving pulse "；3, the output current wave of the second power inverter 2.When PWM is dimmed
When the duty ratio of signal gradually changes, the output umber of pulse and pulse width of power inverter 2 there is no consecutive variations but are in
The identical umber of pulse of output and pulse width, lead to power inverter within the scope of present PWM dim signal duty ratio consecutive variations
2 output electric current does not change, only when PWM dim signal enables 2 driving signal of the second power inverter in section
When umber of pulse or pulse width change, the output electric current of the second power inverter 2 can just change, and be finally reflected in LED
On lamp for LED luminance there is no consecutive variations but apparent change in ladder shape (descending area shows as point of scintillation).
Such as Fig. 4, for the umber of pulse when drive signal duty cycle of power inverter 2 is larger and current wave is exported
Shape in figure is from top to bottom followed successively by 1, PWM dim signal duty ratio；2, the drive signal waveform of the second power inverter 2, from
It is left-to-right to be followed successively by 3,2.6,2.1,1.7,1.2,0.8 pulses；3, the output current wave of the second power inverter 2.Although
Change in ladder shape is presented in the output electric current for still remaining the second power inverter 2 when PWM dim signal change in duty cycle at this time,
But because the drive signal duty cycle of the second power inverter 2 is larger, umber of pulse and the constant range of width are obviously reduced, and are made
The output electric current for obtaining changed power device 2 is more continuous, and dimming effect is softer (descending area smoother).
Claims (6)
1. a kind of LED drive power light adjusting circuit, it is characterized in that: including power input interface, the first changed power device, voltage tune
Save signal transmission module, the second power inverter, voltage detecting and adjustment module；
Power input interface is sequentially connected the first changed power device, the second power inverter, and PWM dim signal connects the second power
Converter；First changed power device, the second power inverter are separately connected voltage detecting and adjustment module；Second power inverter
External LED load；Voltage detecting and adjustment module are sequentially connected regulated voltage signal transmission module, the first changed power device.
2. a kind of LED drive power light adjusting circuit according to claim 1, it is characterized in that: first changed power
Device or the second power inverter are any in boost, buck, Flyback, LLC, LCC, MOSFET, IGBT, Transistor
A kind of switching device.
3. a kind of LED drive power light adjusting circuit according to claim 2, it is characterized in that: the regulated voltage signal
Transmission module is to be directly connected to or by optocoupler, transformer there is the device of signal transfer functions to constitute.
4. a kind of LED drive power light adjusting circuit according to claim 3, it is characterized in that: the voltage detecting and tune
Section module can be MCU or amplifier by acquisition pressure difference and export the device of control signal.
5. a kind of LED drive power light adjusting circuit according to claim 4, it is characterized in that: being carried out using flyback topologies permanent
Pressure output constitutes the first power inverter, constitutes the second power inverter using buck topology, constitutes voltage acquisition using amplifier
With adjustment module, and by optocoupler be transferred to main primary control flyback topologies output voltage.
6. a kind of LED drive power light adjusting circuit according to claim 1, it is characterized in that: power input interface connection the
One power inverter, the first power inverter include the first DC/DC controller, resistance R1 and R2, capacitor C1, diode D1 and
D2, MOSFET Q1, transformer T1 and output electrolytic capacitor C2；The voltage detecting and adjustment module include resistance R4, R5,
R6, capacitor C4 and C5, amplifier OP1 and reference voltage Vref, wherein resistance R5 is connected with the cathode of output to detect power change
The pressure difference of parallel operation 2；Voltage detecting and adjustment module are sequentially connected regulated voltage signal transmission module, the first, second DC/DC control
Device；Second power inverter includes the 2nd DC/DC controller, MOSFET Q2, diode D3, resistance R7, output capacitance C3 and electricity
Feel L1；PWM dim signal and the connection of the 2nd DC/DC controller；Regulated voltage signal transmission module includes resistance R3 and isolation light
Coupling U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811653543.8A CN109451631A (en) | 2018-12-29 | 2018-12-29 | A kind of LED drive power light adjusting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811653543.8A CN109451631A (en) | 2018-12-29 | 2018-12-29 | A kind of LED drive power light adjusting circuit |
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| CN109451631A true CN109451631A (en) | 2019-03-08 |
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| CN201811653543.8A Pending CN109451631A (en) | 2018-12-29 | 2018-12-29 | A kind of LED drive power light adjusting circuit |
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| CN209462669U (en) * | 2018-12-29 | 2019-10-01 | 无锡安特源科技股份有限公司 | A kind of LED drive power light adjusting circuit |
-
2018
- 2018-12-29 CN CN201811653543.8A patent/CN109451631A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090237007A1 (en) * | 2008-03-19 | 2009-09-24 | Niko Semiconductor Co., Ltd. | Light-emitting diode driving circuit and secondary side controller for controlling the same |
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Application publication date: 20190308 |