CN105722272B - A kind of constant pressure dimming power source starting voltage adaptive approach - Google Patents
A kind of constant pressure dimming power source starting voltage adaptive approach Download PDFInfo
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- CN105722272B CN105722272B CN201610086695.9A CN201610086695A CN105722272B CN 105722272 B CN105722272 B CN 105722272B CN 201610086695 A CN201610086695 A CN 201610086695A CN 105722272 B CN105722272 B CN 105722272B
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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]
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
Abstract
The present invention provides a kind of constant pressure dimming power source starting voltage adaptive approach, it is characterized in that output voltage slowly rises when control dimming power source is opened, by the operating current for monitoring LED with the concatenated current detection circuit of LED to be driven, when LED generates operating current, this LED operation voltage is the starting voltage of LED, and minimum brightness is dimmed by external hardware or by the LED that software records are defined as dimming power source, dimming power source rises to the specified constant pressure point that LED light modulation maximum brightness is constant pressure dimming power source.It is adapted to different types of LED lamp bead or mould group according to the method, changes dimming power source directly from the minimum light modulation of LED to most high light optical range, greatly increases the suitability of power supply, expand the dimming scope of LED；Solving that LED dimming power source dimming scope as caused by LED lamp bead cut-in voltage difference itself narrows can not matched technical problem with driving power.
Description
Technical field
The present invention relates to field of LED illumination, in particular to a kind of constant pressure dimming power source starting voltage adaptive approach.
Background technique
The energy-saving effect of LED is significant, and the user of more and more decorative uses replaces pervious halogen lamp using LED lamp
The power supply of tool, halogen lamp is constant voltage source, and to create an atmosphere, different light scenes are arranged using the general dimming interface of industry,
Adapt to different decoration demands.Since the light emission luminance of lamps and lanterns can only be adjusted by adjusting the variation of voltage for constant voltage source,
Build different atmosphere.Due to the characteristic of LED, voltage is lower than internal electric field voltage, and internal carrier cannot form electric current, and LED is not
It can shine；So the light modulation in the minimum positive cut-in voltage of series connection of the voltage lower than LED of the product as constant pressure light modulation can not have
Practical light modulation movement, mean: the dimming scope of LED narrows, and is not all adjustable in entire voltage range.Due to different
The minimum positive cut-in voltage of the series connection of LED lamp there are certain discreteness, therefore different LED lamps effectively dim rise
Beginning voltage is different.Therefore producer must set it according to the series connection minimum cut-in voltage of different LED lamps before factory
Different starting voltages.Currently, it is by adjustable potentiometer or button that the producer for doing constant-voltage LED dimming power source in industry, which uses all,
Minimum brightness point is adjusted, the method is actually also to reduce dimming scope.Every adjustment is needed, therefore causes construction debugging multiple
Miscellaneous, higher cost, and need manually to adjust, therefore consistency is poor.
Summary of the invention
For disadvantages described above, present invention aims at how solving to have differences due to the cut-in voltage of different LED, each
The initialization voltage of the constant pressure dimming power source of lamps and lanterns is all different, requires the problem of individually adjusting；How to solve initial voltage compared with
Height causes dash current big problem when can light to LED.
In order to solve problem above, the invention proposes a kind of constant pressure dimming power source starting voltage adaptive approach, special
Sign be control dimming power source open when output voltage slowly rise, by with the concatenated current detection circuit of LED to be driven
The operating current for monitoring LED, when LED generates operating current, current processing circuits carry out the operating current of the LED monitored
It handles, the LED operation voltage generated under this operating current is the starting voltage of LED, and by external hardware or passes through software note
Record is defined as the LED light modulation minimum brightness of dimming power source, and it is constant pressure dimming power source that dimming power source, which rises to LED light modulation maximum brightness,
Specified constant pressure point.
The constant pressure dimming power source starting voltage adaptive approach, it is characterised in that current detection circuit passes through sampling electricity
Road and the concatenated mode of LED monitor the operating current of LED, and current processing circuits convert the LED operation electric current monitored to and take
Sample voltage signal, and realize and be compared sampling voltage signal by comparator with reference voltage, it is exported according to comparison result
Opto-coupled feedback circuit is controlled, output feedback ontrol dimmer voltage output control module controls the output voltage of LED；Work as system electrification
When, the output voltage of dimmer voltage output control module control LED is gradually lifted, when dimmable load voltage is less than LED starting electricity
When pressure, LED operation electric current is 0, and sampling voltage signal is less than reference voltage；When dimmable load voltage is greater than LED cut-in voltage,
LED operation electric current starts gradually to become larger, and when sampling voltage signal is more than reference voltage, comparator is reversely exported；Opto-coupled feedback electricity
Road adjusts control dimmer voltage output control module according to comparator；The operating voltage of the LED of the reversed output time of comparator is
For the specified constant pressure point of LED.
The constant pressure dimming power source starting voltage adaptive approach, it is characterised in that the sampling electricity in current detection circuit
Current sensor in road is using resistance, diode, MOSFET, BJT or current transformer.
The constant pressure dimming power source starting voltage adaptive approach, it is characterised in that further include sampling protection circuit, institute
Sampling protection circuit is stated to be arranged in parallel with sample circuit.
The constant pressure dimming power source starting voltage adaptive approach, it is characterised in that sample circuit is using current detecting electricity
Resistance, current processing circuits include comparator, current sense resistor one end ground connection, the other end and the concatenated node of LED load
It is connected to the negative terminal of comparator；The positive termination reference voltage of comparator；The output end of comparator and the optocoupler of opto-coupled feedback circuit
Diode is connected.
The constant pressure dimming power source starting voltage adaptive approach, it is characterised in that the sampling protection circuit is using general
Logical diode pressure limiting realizes that the general-purpose diode is in parallel with current sense resistor.
The constant pressure dimming power source starting voltage adaptive approach, it is characterised in that sampling protection circuit use by
The switching-type device of outside control, the switching-type device is in parallel with current sense resistor, further includes protection switching-type device
Driving circuit and voltage follower circuit, the input terminal of voltage follower circuit connects with current sense resistor, output end and protection
Connected with the negative input end of the driving circuit of switching-type device, the positive input terminal of the driving circuit of protection switching-type device with open
The setting of pass type device allows the reference voltage of conduction voltage drop to connect.
The constant pressure dimming power source starting voltage adaptive approach, it is characterised in that it further include isolating diode, it is described
Isolating diode is connected between the output end of comparator and the optocoupler diode of opto-coupled feedback circuit, the cathode of isolating diode
Connect the output end of comparator.
The constant pressure dimming power source starting voltage adaptive approach, it is characterised in that the current processing circuits include mould
Number conversion module, sampling voltage signal are connected with the analog input end of analog-to-digital conversion module, and the comparator is by current processing electricity
MCU software realization in road, when sampling voltage signal reaches preset reference voltage, MCU software records moment MCU
Software exports the duty ratio of pwm control signal, and the operating voltage of the corresponding connection LED of the duty ratio of the pwm control signal is
The starting voltage of LED.
The present invention passes through the electric current of sampling LED, and feedback control constant pressure dimming power source, keeps power supply adaptive in the moment of unlatching
The positive operating current of minimum that LED should be arrived, then keeps minimum positive operating current constant, and by external hardware or pass through software
Record is defined as the LED light modulation minimum brightness of dimming power source, is adapted to different types of LED lamp bead or mould according to the method
Group changes dimming power source directly from the minimum light modulation of LED to most high light optical range, greatly increases the suitability of power supply, expand
The dimming scope of LED；It solves LED dimming power source dimming scope as caused by LED lamp bead cut-in voltage difference itself to narrow
It can not matched technical problem with driving power.Output voltage delays before LED forms electric current when being opened by control dimming power source
It is slow to rise, it also prevents booting moment and rush of current is caused to LED, protective effect is played to load LED, extends load
The service life of LED.
Detailed description of the invention
Fig. 1 is the block diagram of constant pressure dimming power source starting voltage adaptive approach；
Fig. 2 is the schematic diagram of the embodiment one of constant pressure dimming power source starting voltage adaptive approach；
Fig. 3 is the schematic diagram of the embodiment two of constant pressure dimming power source starting voltage adaptive approach；
Fig. 4 is the schematic diagram of the embodiment three of constant pressure dimming power source starting voltage adaptive approach.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is the block diagram of constant pressure dimming power source initial voltage adaptive approach；Whole implementation is to dim in control
Output voltage slowly rises when electric power starting, by the work electricity for monitoring LED with the concatenated current detection circuit of LED to be driven
Stream, when LED generates operating current, current processing circuits handle the operating current of the LED monitored, this operating current
The LED operation voltage of lower generation is the starting voltage of LED, and is defined as dimming power source by external hardware or by software records
LED dim minimum brightness, dimming power source LED light modulation maximum brightness be constant pressure dimming power source specified constant pressure point.
Fig. 2 is the schematic diagram of the embodiment one of constant pressure dimming power source starting voltage adaptive approach；Including constant-voltage LED tune
The output voltage DC+ of photoelectric source, the photoelectrical coupler U1 of power supply feedback control loop, comparator/operational amplifier U2, current sense resistor
R2, general-purpose diode D2, protective current detection resistance are used, and reference voltage end Vref, isolating diode D1, photoelectrical coupler is arranged
The current-limiting resistance R1 of U1.
When LED load is connected to the output voltage end DC+ according to polarity, when dimmable load voltage DC OUT terminal voltage is less than
When LED load minimum cut-in voltage, no current flows through on current sense resistor R2；When dimmable load voltage DC OUT terminal voltage increases
When being added to greater than LED load minimum cut-in voltage, electric current flows through LED load by the end output voltage DC+, passes through current sense resistor
R2 with flowing to the circuit of power supply, when current sense resistor R2 flows through electric current, due to finite resistance stream act on, at the both ends of resistance
Voltage can be generated；When current sense resistor R2 detects voltage signal, this voltage signal is sent into the negative of comparator/operational amplifier U2
End, the negative terminal voltage of comparator/operational amplifier U2 are compared with the anode voltage of comparator/operational amplifier U2, control comparison operation
The output end voltage of amplifier U2 be it is positive or negative, when the output end voltage of comparator/operational amplifier U2 is negative, photoelectrical coupler
U1 work controls the major loop pulse width variations of power supply, to control electricity so that the power supply feedback that control is controlled by optocoupler works
Stream is arranged within the scope of the positive operating current of minimum of LED, and the anode voltage of comparator/operational amplifier U2 is the minimum of LED
The setting reference voltage of positive operating current, this voltage can be set, but in parallel general not above current sense resistor R2 institute
The forward voltage drop of logical diode D2.
Voltage on current sense resistor R2 changes with the curent change for flowing through current sense resistor R2, when electric current is examined
When the voltage that the both ends of measuring resistance R2 generate is greater than the forward voltage drop of institute general-purpose diode D2 in parallel, electric current is by common two pole of parallel connection
Pipe D2 bypass, to limit the power consumption of current sense resistor R2, improves the efficiency of power supply.
Fig. 3 is the schematic diagram of the embodiment two of constant pressure dimming power source starting voltage adaptive approach；Embodiment second is that
Further progress is improved on the basis of embodiment one, in order to further decrease the loss of power, increases power-efficient, will be real
Apply the general-purpose diode D2 in mode one and be changed to switching-type device by outside control, switching-type device can for MOSFET or
BJT.The work of voltage follower U2-2 and operation comparator U2-3 driving switch type devices switch type device；Minimum opens reference
The setting reference voltage of the positive operating current of the minimum that voltage Vref-1 is LED；Circuit protection reference voltage Vref -2 is setting
The forward voltage drop of control switch type devices switch type device.
Fig. 4 is the schematic diagram of the embodiment three of constant pressure dimming power source starting voltage adaptive approach.It is pressed when LED load
When being connected to the output voltage end DC+ of constant-voltage LED dimming power source according to polarity, electric current flows through LED load by the end DC+, is examined by electric current
Measuring resistance R2 with flowing to the circuit of power supply, when current sense resistor R2 flows through electric current, due to finite resistance stream act on, in resistance
Both ends can generate voltage, this voltage changes with the curent change for flowing through current sense resistor R2, works as current sense resistor
When the voltage that the both ends of R2 generate is greater than the forward voltage drop of institute parallel connection general-purpose diode D2, electric current by general-purpose diode D2 in parallel by
The efficiency of power supply is improved to limit the power consumption of current sense resistor R2 in road；When current sense resistor R2 detects that voltage is believed
Number, the buffering filter circuit that this voltage signal is formed by resistance R10 and capacitor C4 is sent into the input port AD of MCU, and the AD of MCU is defeated
Entrance is made of the analog-to-digital conversion module of 10 bit resolutions, and it is 5MV that minimum, which differentiates voltage, can accurately detect very much electric current
Detection resistance R2's flows through electric current, and analog voltage is converted into what MCU was capable of handling by the analog-to-digital conversion module of the input port AD of MCU
Digital signal, electric current of the MCU according to current sense resistor R2, in the PWM voltage letter of the pin output respective pulses width of MCU
Number, DC voltage, which is filtered into, by the integrating circuit being made of resistance R9, capacitor C3, resistance R8, capacitor C2 is added to comparison operation
The anode of amplifier U3 controls the pressure stabilizing value of three-terminal voltage-stabilizing circuit U 2, so that the power supply feedback that control is controlled by optocoupler works,
The major loop pulse width variations of power supply are controlled, are arranged within the scope of the positive operating current of minimum of LED to control electric current；?
The PWM voltage signal of the pin output respective pulses width of MCU, this PWM voltage signal show that optimum value is solidificated according to test
Inside MCU, the PWM pulse width variations range of MCU show that best PWM voltage signal values change to maximum pulse width by testing, due to setting
The best PWM voltage signal values that test obtains are equipped with, then the variation range of the PWM pulsewidth of subsequent light modulation cannot be most scun
Width arrives maximum pulse width, and a fixed numerical value is superimposed on minimum pulse width, it is necessary to be handled, be made by MCU intrinsic function
Light modulation changes from minimum to maximum.
The above disclosure is only one embodiment of the present invention, and of course, the scope of this right cannot be limited by this,
Those skilled in the art can understand all or part of the processes for realizing the above embodiment, and according to the claims in the present invention institute
The equivalent variations of work still falls within the range that the present invention is covered.
Claims (8)
1. a kind of constant pressure dimming power source starting voltage adaptive approach, it is characterised in that output voltage when control dimming power source is opened
Slowly rise, by monitoring the operating current of LED with the concatenated current detection circuit of LED to be driven, when LED generates work electricity
When stream, current processing circuits handle the operating current of the LED monitored, and specially current detection circuit passes through sampling electricity
Road and the concatenated mode of LED monitor the operating current of LED, and current processing circuits convert the LED operation electric current monitored to and take
Sample voltage signal, and realize and be compared sampling voltage signal by comparator with reference voltage, it is exported according to comparison result
Opto-coupled feedback circuit is controlled, output feedback ontrol dimmer voltage output control module controls the output voltage of LED；Work as system electrification
When, the output voltage of dimmer voltage output control module control LED is gradually lifted, and opens electricity when dimmable load voltage is less than LED
When pressure, LED operation electric current is 0, and sampling voltage signal is less than reference voltage；When dimmable load voltage is greater than LED cut-in voltage,
The LED operation voltage generated under this operating current is the starting voltage of LED, and defines by external hardware or by software records
For the light modulation minimum brightness to LED of dimming power source；LED operation electric current starts gradually to become larger, when sampling voltage signal is more than ginseng
Voltage is examined, comparator reversely exports；Opto-coupled feedback circuit adjusts control dimmer voltage output control module according to comparator；Compare
The operating voltage of the LED of the reversed output time of device is the specified constant pressure point of LED；I.e. dimming power source rises to LED light modulation highest
Brightness is the specified constant pressure point of constant pressure dimming power source.
2. constant pressure dimming power source starting voltage adaptive approach according to claim 1, it is characterised in that current detecting electricity
The current sensor in sample circuit in road is using resistance, diode, triode, MOSFET, BJT or current transformer.
3. constant pressure dimming power source starting voltage adaptive approach according to claim 2, it is characterised in that further include sampling
Circuit is protected, the sampling protection circuit is arranged in parallel with sample circuit.
4. constant pressure dimming power source starting voltage adaptive approach according to claim 3, it is characterised in that sample circuit is adopted
With current sense resistor, current processing circuits include comparator, and current sense resistor one end ground connection, the other end and LED are negative
Carry the negative terminal that concatenated node is connected to comparator；The positive termination reference voltage of comparator；The output end of comparator and optocoupler are anti-
The optocoupler diode of current feed circuit is connected.
5. constant pressure dimming power source starting voltage adaptive approach according to claim 4, it is characterised in that the sampling is protected
Protection circuit realizes that the general-purpose diode is in parallel with current sense resistor using general-purpose diode pressure limiting.
6. constant pressure dimming power source starting voltage adaptive approach according to claim 5, it is characterised in that the sampling is protected
Protection circuit uses the switching-type device by outside control, and the switching-type device is in parallel with current sense resistor, further includes protection
With the driving circuit and voltage follower circuit of switching-type device, the input terminal of voltage follower circuit connects with current sense resistor,
Output end connects with the negative input end of the driving circuit of protection switching-type device, the driving circuit of protection switching-type device
Positive input terminal allows the reference voltage of conduction voltage drop to connect with the setting of switching-type device.
7. constant pressure dimming power source starting voltage adaptive approach according to claim 5 or 6, it is characterised in that further include every
From diode, the isolating diode is connected between the output end of comparator and the optocoupler diode of opto-coupled feedback circuit, every
Cathode from diode connects the output end of comparator.
8. constant pressure dimming power source starting voltage adaptive approach according to claim 4, it is characterised in that at the electric current
Managing circuit includes analog-to-digital conversion module, and sampling voltage signal is connected with the analog input end of analog-to-digital conversion module, the comparator
By the MCU software realization in current processing circuits, when sampling voltage signal reaches preset reference voltage, MCU software
The duty ratio of moment MCU software output pwm control signal is recorded, the corresponding connection LED's of the duty ratio of the pwm control signal
Operating voltage is the starting voltage of LED.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6505062B2 (en) * | 2016-10-12 | 2019-04-24 | 本田技研工業株式会社 | Voltage conversion device and device |
| CN109309993B (en) * | 2018-11-16 | 2024-02-27 | 苏州中储普华电力科技有限公司 | Loop dimming circuit for intelligent illumination |
| CN112637991A (en) * | 2019-09-20 | 2021-04-09 | 台达电子工业股份有限公司 | Power supply applied to light emitting diode and operation method thereof |
| CN110896279B (en) * | 2019-10-12 | 2022-12-23 | 深圳市伟鹏世纪科技有限公司 | LED emergency power supply constant power output circuit and working method |
| CN114205965B (en) * | 2021-11-24 | 2022-10-11 | 广东新昇电业科技股份有限公司 | Circuit for preventing LED from flickering during starting |
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| CN102821526A (en) * | 2012-09-05 | 2012-12-12 | 浙江大学 | Circuit for realizing voltage-self-adaptation PWM (Pulse Width Modulation) light adjustment of LED (Light Emitting Diode) under drive of prepositive constant-current source |
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| CN102821526A (en) * | 2012-09-05 | 2012-12-12 | 浙江大学 | Circuit for realizing voltage-self-adaptation PWM (Pulse Width Modulation) light adjustment of LED (Light Emitting Diode) under drive of prepositive constant-current source |
| CN103079320A (en) * | 2013-01-21 | 2013-05-01 | 成都启臣微电子有限公司 | LED (Light Emitting Diode) constant current controller and LED constant current drive circuit |
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