CN107027225B - The light-dimming method of LED light adjusting circuit and LED module, LED module - Google Patents
The light-dimming method of LED light adjusting circuit and LED module, LED module Download PDFInfo
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- CN107027225B CN107027225B CN201710450869.XA CN201710450869A CN107027225B CN 107027225 B CN107027225 B CN 107027225B CN 201710450869 A CN201710450869 A CN 201710450869A CN 107027225 B CN107027225 B CN 107027225B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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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
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- 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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Abstract
The light-dimming method of a kind of LED light adjusting circuit of the present invention and LED module, LED module, the circuit includes voltage input end and first voltage output end, second voltage output end, wherein, voltage regulator circuit is connected between voltage input end and first voltage output end, it is connected with switching circuit between voltage input end and second voltage output end, the height of the voltage value that switching circuit is inputted according to voltage input end and on-off.The LED module includes above-mentioned LED light adjusting circuit and two groups of LED chip groups.This method includes that voltage is provided to voltage input end, and the voltage of voltage input end output provides stable voltage to the first LED chip group after voltage regulator circuit, and the first LED chip group shines；When the voltage of voltage input end input is higher than the on state threshold voltage of switching circuit, switching circuit is connected and provides voltage to the second LED chip group, and the second LED chip group shines.The color temperature adjustment for the realization LED module that the present invention can be convenient.
Description
Technical field
The present invention relates to light emitting semiconductor device fields, specifically, being to be related to a kind of LED light adjusting circuit and have this
The LED module of kind light adjusting circuit, further relates to a kind of light-dimming method of LED module.
Background technique
LED light device using light emitting diode (LED) be used as light-emitting component, with energy conservation and environmental protection, consumption power it is low,
The advantages that long service life, is widely used in various illumination occasions.A kind of existing LED light device uses two groups of LED cores
Piece group can issue the light of cool tone, another group of LED core wherein one group of LED chip group is cold light LED chipset after energization
Piece group is warm light lamp chip group, and warm-toned light can be issued after energization.In this way, people can be by controlling to two groups of LED
The voltage of chipset load controls the light emission luminance of two groups of LED chip groups, to change the colour temperature of LED light device entirety.
LED module used in current tunable optical toning LED light device is connected by binary channels external power supply
It powers onto LED module, that is, respectively to two groups of LED chip groups, the power supply of two groups of LED chip groups is controlled respectively, by changing
The light emission luminance for becoming two groups of LED chip groups reaches the function of light modulation and toning.
It is warmed up for example, the Chinese utility model patent that notification number is CN205793535U discloses one kind by adjusting respectively
The scheme of White-light LED chip group and cool white light LED chip group realizes the color temperature adjustment of LED module.The control electricity of the program
Road be provided with two triodes respectively as two Sofe Switch, two triodes control respectively one group of LED chip shine with
Extinguish.In this way, needing to be arranged a switch in control circuit for controlling the on-off of two triodes.
However, warm white LED chipset and cool white light LED chip group are all that difference is adjustable due in this scheme, because
This circuit structure is complicated, especially needs to be arranged switch of the turn knob potentiometer as two groups of LED chip group on-off of control, leads
The sufficiently bulky of LED module is caused, and the area of control circuit is very big, causes the area of pcb board very big, and then increases LED mould
The production cost of group.In addition, needing to manually adjust, also being brought for the color temperature adjustment of LED module when adjusting the colour temperature of LED module
It is inconvenient.
Summary of the invention
The first object of the present invention is to provide a kind of simple LED light adjusting circuit of circuit structure.
The second object of the present invention is to provide the LED module that a kind of structure is simple, production cost is low.
The third object of the present invention is to provide a kind of color temperature adjustment simply and easily LED module light-dimming method.
In order to realize the first above-mentioned purpose, LED light adjusting circuit provided by the invention includes voltage input end and first
Voltage output end, second voltage output end, wherein it is connected with voltage regulator circuit between voltage input end and first voltage output end,
Switching circuit, the electricity that switching circuit is inputted according to voltage input end are connected between voltage input end and second voltage output end
The height of pressure value and on-off.
From above scheme as it can be seen that the voltage of voltage input end output is defeated to first voltage output end after voltage regulator circuit
Out, it may insure that first group of LED chip group connecting with first voltage input terminal obtains stable voltage, and light emission luminance in this way
It is invariable, the lifting of input voltage will not be followed and changed.At this time, it is only necessary to the voltage for being input to voltage input end is adjusted,
The voltage of second voltage output end can be changed, to change second group of LED chip group connecting with second voltage output end
Light emission luminance.In this way, it is invariable by one group of LED chip group light emission luminance of control, change the hair of another group of LED chip group
The color temperature adjustment of LED module may be implemented in brightness.
Due in the solution of the present invention, it is only necessary to adjust the light emission luminance of wherein one group of LED chip group, therefore LED is dimmed
The structure of circuit is simple, can reduce the production cost of LED module.Further, since the light emission luminance tune of second group of LED chip group
Section is that the supply voltage for being input to LED module by adjusting is realized, therefore is not needed setting and manually switched, and can be subtracted significantly
The volume of small LED module also reduces the area of pcb board.
One Preferable scheme is that, switching circuit includes bleeder circuit and switch module, and the control terminal of switch module connects
It is connected on the dividing point of bleeder circuit, the output end of switch module is connected to second voltage output end.
As it can be seen that by the on-off of bleeder circuit control switch module, when input voltage is lower, the voltage of dividing point compared with
Low, switch module disconnects, and second voltage output end do not have voltage output, and the second LED chip group does not shine, only input voltage compared with
It can just shine when high, to easily control shining and extinguishing for the second LED chip group.
Further embodiment is that switch module includes first switch device and second switch device, first switch device
Control terminal be connected on the dividing point of bleeder circuit, an output end of first switch device is connected to second switch device
One output end of control terminal, second switch device is connected to second voltage output end.
As it can be seen that the voltage cut-out module by input that can be convenient using two switching device composition Sofe Switch groups
On-off, and use triode, field-effect tube etc. as switching device, the production cost of LED light adjusting circuit can be reduced.
Preferably, voltage regulator circuit includes low voltage difference voltage stabilizing chip, and the input pin of low voltage difference voltage stabilizing chip is connected to voltage
Input terminal, the output end of low voltage difference voltage stabilizing chip are connected to first voltage output end.
In this way, when the power of input is lower and the voltage of input is higher than the starting voltage of low voltage difference voltage stabilizing chip, low pressure
Poor voltage stabilizing chip is powered to the first LED chip group, and the first LED chip group shines, but brightness is lower, with the increasing of input power
Greatly, the voltage of low voltage difference voltage stabilizing chip output increases, and the brightness of the first LED chip group increases, but colour temperature remains unchanged.In this way,
The adjusting in the lower situation of input power to LED module light emission luminance may be implemented.
To realize that the second above-mentioned purpose, LED module provided by the invention include the first LED chip group, the second LED chip
Group and LED light adjusting circuit, LED light adjusting circuit include voltage input end and first voltage output end, second voltage output end,
Wherein, voltage regulator circuit, voltage input end and second voltage output end are connected between voltage input end and first voltage output end
Between be connected with switching circuit, the height of the voltage value that switching circuit is inputted according to voltage input end and on-off.
It can be seen that the voltage that the voltage input end of LED light adjusting circuit exports is defeated to first voltage after voltage regulator circuit
Outlet output, it can be ensured that the first LED chip group obtains stable voltage, and light emission luminance remains unchanged.In this way, adjustable
It is input to the voltage of voltage input end, it can change the voltage of second voltage output end, to change the second LED chip group
Light emission luminance.In this way, it is invariable by the first LED chip group light emission luminance of control, change the luminance of the second LED chip group
Degree, may be implemented the color temperature adjustment of LED module.And the structure of LED light adjusting circuit is simple, the area of pcb board is smaller, Ke Yi great
The big volume for reducing LED module, also reduces the production cost of LED module.
Further embodiment is that the first LED chip group is warm light LED chip group, and the second LED chip group is cold light LED core
Piece group；When the voltage that voltage input end is inputted increases, the colour temperature that LED module emits beam gradually turns cold.
As it can be seen that the voltage inputted by changing voltage input end, may be implemented the colour temperature of LED module by the warm change to turn cold
Change, convenient for users to adjusting.
To realize above-mentioned third purpose, in the light-dimming method of LED module provided by the invention, LED module includes first
LED chip group, the second LED chip group and LED light adjusting circuit, LED light adjusting circuit include voltage input end and first voltage
Output end, second voltage output end, first voltage output end are powered to the first LED chip group, and second voltage output end is to second
The power supply of LED chip group；Also, voltage regulator circuit is connected between voltage input end and first voltage output end, voltage input end with
Switching circuit is connected between second voltage output end；This method comprises: providing voltage to voltage input end, voltage input end is defeated
Voltage out provides voltage to the first LED chip group after voltage regulator circuit, and the first LED chip group shines and colour temperature keeps permanent
It is fixed；When the voltage of voltage input end input is higher than the on state threshold voltage of switching circuit, switching circuit conducting and to second
LED chip group provides voltage, and the second LED chip group shines.
By above scheme as it can be seen that when the colour temperature to LED module is adjusted, it is only necessary to which control is input to the defeated of LED module
Enter voltage, since LED light adjusting circuit exports stable voltage to the first LED chip group, it can be ensured that the first LED chip group
The light color temperature of sending is constant, and can change second voltage output end by the voltage that adjusting is input to voltage input end
Voltage can also change the light emission luminance of the second LED chip group, it can realize the color temperature adjustment of LED module.LED module
Color temperature adjustment it is very simple, can pass through shirtsleeve operation change input voltage, it might even be possible to set using smart electronics
Standby adjusting is input to the voltage of LED module to change the colour temperature of LED module.
One Preferable scheme is that, voltage input end input voltage be higher than switching circuit on state threshold voltage when,
Switching circuit provides the voltage up-down of voltage follow voltage input end input to the second LED chip group and goes up and down；In switching circuit
When providing voltage raising to the second LED chip group, the brightness of the second LED chip group increases；In switching circuit to the second LED chip
When group provides voltage reduction, the brightness of the second LED chip group reduces.
It can be seen that when user needs to adjust the colour temperature of LED module, it is only necessary to adjust the voltage for being input to LED module
, therefore only need that one group of switching circuit for changing the second LED chip group is arranged in LED module, to reduce LED mould
The production cost of group also reduces the volume of LED module.
Further embodiment is that the first LED chip group is warm light LED chip group, and the second LED chip group is cold light LED core
Piece group；When the voltage of voltage input end input is higher than the on state threshold voltage of switching circuit and voltage gradually rises, LED module
Luminous colour temperature gradually turns cold；When the voltage of voltage input end input is gradually reduced, the luminous colour temperature of LED module is gradual warmed up.
It can be seen that the brightness of the second LED chip group is gradually when being input to the voltage of LED module by low gradually rise
Increase, the colour temperature for the light that such LED module issues also gradually turns cold；Opposite, if being input to the voltage of LED module by low
When being gradually reduced, the brightness of the second LED chip group is gradually reduced, and the colour temperature for the light that such LED module issues also gradual warms up,
So that the color temperature adjustment of LED module is very simple.
Detailed description of the invention
Fig. 1 is the structural block diagram of LED module embodiment of the present invention.
Fig. 2 is the electrical schematic diagram of LED light adjusting circuit embodiment of the present invention.
Fig. 3 is the flow chart of LED module light-dimming method embodiment of the present invention.
Fig. 4 is color temperature change figure instantaneous when the input power of LED module embodiment of the present invention changes.
Color temperature change figure when Fig. 5 is the input power stable state variation of LED module embodiment of the present invention.
The invention will be further described with reference to the accompanying drawings and embodiments.
Specific embodiment
LED module of the invention can be used for lighting system, such as on illuminating lamps and lanterns, can also apply special
On the lamps and lanterns of purposes, such as plant generates, decoration, attracts on animal lamps and lanterns.Preferably, had using the lighting system of LED module
There is shell, which is set in shell.Also, LED module of the invention is the LED module of adjustable color, i.e. LED mould
There are two the colour temperatures of extreme position for the light tool that group issues, and can taper to second from the colour temperature of the first extreme position
The colour temperature of extreme position.
Referring to Fig. 1, the LED module of the present embodiment include power supply 10, LED light adjusting circuit 20 and the first LED chip group 24,
Second LED chip group 28, wherein power supply 10 can be the power supply comprising battery, and be provided with light modulator, for adjusting output
It is adjustable to the power of LED light adjusting circuit 20 or the output power of battery.Certainly, power supply 10 be also possible to receive alternating current and
The alternating current of 220V is converted into the power supply of low-voltage DC, and is provided with light modulator in power supply 10.For example, can be can for power supply 10
Rechargeable battery can charge to rechargeable battery by charger when rechargeable battery not enough power supply.Practical application
When, power supply 10 can be external light source, i.e. light source is arranged outside LED module.
LED light adjusting circuit 20 includes voltage input end 21, voltage regulator circuit 22, first voltage output end 23, switching circuit 26
And second voltage output end 27, wherein first voltage output end 23 is powered to the first LED chip group 24, second voltage output
End 27 powers to the second LED chip group 28.In the present embodiment, the first LED chip group 24 and the second LED chip group 28 are to issue light
Two kinds of different LED chip groups of line, for example, the first LED chip group 24 is the LED chip group of sending warm white, and the second LED core
Piece group 28 is to issue the LED chip group of cool white light.It is of course also possible to be the LED core that the first LED chip group 24 is sending cool white light
Piece group, and the second LED chip group 28 is to issue the LED chip group of warm white.In the present embodiment, the LED chip group of warm white can
To be that the colour temperature that emits beam is lower than the LED chip group of 3500 Kelvins, the LED chip group of cool white light can be the colour temperature that emits beam
Higher than the LED chip group of 5000 Kelvins, certainly, the colour temperature that two groups of LED chip groups emit beam when practical application can basis
Actual conditions are adjusted, as long as the colour temperature for the light that the first LED chip group issues is lower than the color for the light that the second LED chip group issues
Temperature.
Referring to fig. 2, there are two input terminals 31,32 for the tool of LED light adjusting circuit 20, and wherein input terminal 31 is that reception is positive straight
The terminal of galvanic electricity pressure, input terminal 32 is the terminal for receiving negative DC voltage, therefore input terminal 31,32 constitutes this implementation
The voltage input end 21 of example.Also, LED light adjusting circuit 20 is additionally provided with four output terminals 33,34,35,36, wherein output terminal
33, the first voltage output end 23 of 34 composition the present embodiment, output terminal 33 provide positive DC electricity to the first LED chip group,
Output terminal 34 provides negative DC electricity to the first LED chip group.The second voltage that output terminal 35,36 constitutes the present embodiment is defeated
Outlet 27, output terminal 35 provide positive DC electricity to the second LED chip group, and output terminal 36 is provided to the second LED chip group
Negative DC electricity.
Voltage regulator circuit 22 is connected between voltage input end 21 and first voltage input terminal 23, as it is clear from fig. 2 that pressure stabilizing is electric
Road 22 includes voltage stabilizing chip U1, and the input pin of voltage stabilizing chip U1 is connected to input terminal 31, and the output of voltage stabilizing chip U1 is drawn
Foot is connected to the output son 33.In this way, the DC voltage that voltage input end 21 provides is after the steady pressure treatment of voltage stabilizing chip U1
Output is to first voltage output end 23, so that the voltages keep constant that the first LED chip group 24 receives.
In the present embodiment, voltage stabilizing chip U1 is low voltage difference voltage stabilizing chip, when the power that power supply 10 inputs is lower, but as long as electric
When starting threshold value of the voltage for pressing input terminal 21 to input higher than voltage stabilizing chip U1 but the pressure stabilizing value of the setting lower than voltage stabilizing chip U1,
The voltage of voltage stabilizing chip U1 output will follow input voltage linear change, when the voltage that voltage input end 21 inputs is higher than pressure stabilizing core
When the pressure stabilizing value of the setting of piece U1, the voltage of voltage stabilizing chip U1 output be will remain in the pressure stabilizing value, will not follow input
Voltage increases and increases.
Therefore, it is higher than the starting threshold value of voltage stabilizing chip U1 in the voltage that voltage input end 21 inputs but is lower than voltage stabilizing chip U1
Setting pressure stabilizing value when, the raising for the voltage follow input voltage that first group of LED chip group 24 receives and increase, first group
The brightness of LED chip group 24 is continuously increased, but colour temperature remains unchanged.When the voltage that voltage input end 21 inputs is higher than voltage stabilizing chip
When the pressure stabilizing value of the setting of U1, the brightness of first group of LED chip group 24 will be remained unchanged.
In the present embodiment, in order to ensure voltage signal that the first LED chip group 24 receives is more steady, in input terminal
Filter capacitor group is provided between 33 and output terminal 34, filter capacitor group includes the capacitor C2 and C3 being connected in parallel, and passes through filter
Wave capacitance group is filtered the voltage stabilizing chip U1 voltage exported.
It is provided with switching circuit 26 between voltage input end 21 and second voltage output end 27, in the present embodiment, switch
The on-off of circuit 26 is determined by the input voltage of voltage input end 21.Switching circuit 26 includes bleeder circuit and switching molding
Block, as it is clear from fig. 2 that bleeder circuit includes resistance R6, R7, the R8 being connected in series, the wherein connection between resistance R7 and resistance R8
Point constitutes dividing point.Switch module includes two switching devices, in the present embodiment, triode is used to realize switch as Sofe Switch
Function, wherein triode Q1 is connected on dividing point as first switch device, base stage B11, i.e. base stage B11 is connected to resistance
Between R7 and resistance R8, the emitter E 11 of triode Q1 is connected to the output son 36 by resistance R11.
Triode Q2 is connected to the collector C11 of triode Q1 by resistance as second switch device, base stage B12,
The emitter E 12 of triode Q2 is connected to the output son 35, and collector C12 is connected to input terminal 31 by resistance R10.It can
See, in the present embodiment, the control terminal of the triode Q1 as first switch device, i.e. base stage B11 are actually connected to partial pressure electricity
On the dividing point on road, and an output end as triode Q1, i.e. collector C11 are connected to three as second switch device
The control terminal of pole pipe Q2, i.e. base stage B12, and an output end of triode Q2, i.e. emitter E 12 are connected to second voltage output
End 27.In the present embodiment, triode Q1 is a NPN type triode, and triode Q2 is a PNP type triode.
In addition, the sum of the resistance value of resistance R6 and resistance R7 should be far longer than the resistance value of resistance R8, example in bleeder circuit
Such as, the sum of the resistance value of resistance R6 and resistance R7 is 5 times or more of resistance R8 resistance value.In this way, inputted when voltage input end 21
When voltage is lower, the voltage of such as input only has 5 volts, then according to voltage divider principle, the voltage on the base stage B11 of triode Q1 only has 1
Volt, voltage required for being connected lower than triode Q1, triode Q1 is in off state at this time, and triode Q2 is also at cut-off shape
State.As it can be seen that only when the voltage that voltage input end 21 inputs is higher than the on state threshold voltage of switching circuit 26, switching circuit 26
It can just be connected.In the present embodiment, the voltage that the on state threshold voltage of switching circuit 26 refers to that voltage input end 21 inputs can make
The voltage value of voltage input end 21 in the case where conducting voltage of the voltage of the base stage B11 of triode Q1 higher than triode Q1.Example
Such as, the conducting voltage of triode Q1 is 5 volts, then according to voltage divider principle, the input voltage of voltage input end 21 needs 25 volts of ability
Enough so that forming 5 volts of voltage on the base stage B11 of triode Q1, therefore on state threshold voltage is exactly 25 volts.
As it can be seen that the control terminal of switch module is exactly the base stage B11 of triode Q1 in this implementation, it is connected to bleeder circuit
Dividing point on, therefore the conducting and cut-off of switch module may be implemented by the voltage for the dividing point for controlling bleeder circuit,
Exactly control shining and extinguishing for the second LED chip group 28.
The color temperature adjusting method of LED module is introduced below with reference to Fig. 3.Firstly, providing voltage to voltage input end 21, that is, hold
Row step S1.When the received voltage of voltage input end 21 is higher than the starting voltage of voltage stabilizing chip U1, if voltage is lower than at this time
The voltage of the pressure stabilizing value of voltage stabilizing chip setting, voltage stabilizing chip output will follow input voltage to increase and increase, at this time the first LED core
Piece group 24 shines, and as the voltage of output increases, such as the power of input increases, and 24 light emission luminance of the first LED chip group increases, but
Colour temperature keeps constant constant.After pressure stabilizing value of the voltage higher than voltage stabilizing chip setting that voltage input end 21 inputs, pressure stabilizing core
Piece U1 exports steady dc voltage to first voltage output end 23, i.e. execution step S2.Generally, due to voltage stabilizing chip U1's
It is very low to start voltage, often only need 3 volts to 5 volts to start, in this way, the first LED chip group 24 shines, and luminance
Degree can change but colour temperature is kept constant.But since the voltage formed on the dividing point of bleeder circuit at this time is lower, such as only
1 volt, triode Q1 is in off state, and second voltage output end 24 does not have voltage output, and the second LED chip group does not shine.
As the voltage that voltage input end 21 inputs increases, when the voltage of input is higher than on state threshold voltage, triode
It is high level signal at the base stage B11 of Q1, triode Q1 is connected at this time, forms low electricity at the collector C11 of triode Q1 at this time
Ordinary mail number, triode Q2 conducting, thus realize that switching circuit is connected, i.e. execution step S3.At this point, the electric current of input terminal 31 can
It to flow to output terminal 35 by resistance R10, triode Q2, and powers to the second LED chip group 28, i.e. execution step S4.
Since the voltage loaded in the second LED chip group 28 is no better than the voltage that voltage input end 21 is inputted, the
The voltage at two LED chip groups, 28 both ends goes up and down the lifting for the voltage for following voltage input end 21 to input, i.e. execution step S5.
When the voltage that voltage input end 21 inputs increases, i.e., when the voltage between input terminal 31,32 increases, output terminal 35,36
Between voltage also follow raising, the light emission luminance of the second LED chip group 28 also follows increase；It is inputted when voltage input end 21
When voltage reduces, i.e., when the voltage between input terminal 31,32 reduces, the voltage between output terminal 35,36 also follows reduction,
The light emission luminance of second LED chip group 28, which also follows, to become smaller.
Finally, execute step S6, due to the light emission luminance and colour temperature of the first LED chip group 24 keep constant it is constant, and
The light emission luminance of second LED chip group 28 follows the voltage up-down of voltage input end 21 and changes, i.e., sends out when voltage increases
Brightness increases, and light emission luminance reduces when voltage reduces.In this way, when two groups of LED chip groups are arranged in same housing, LED
The colour temperature of mould group will follow the brightness change of the second LED chip group and change.
In the present embodiment, the first LED chip group is to issue the LED chip group of warm white, and the second LED chip group is that sending is cold
The LED chip group of white light.In this way, the luminous colour temperature of LED module turns cold when the brightness of the second LED chip group 28 increases, and the
When the brightness of two LED chip groups 28 reduces, the luminous colour temperature of LED module warms.As it can be seen that working as the voltage that voltage input end is inputted
When raising, the colour temperature of LED module turns cold, and when the voltage that voltage input end is inputted reduces, the colour temperature of LED module warms.This
Outside, the colour temperature that LED module emits beam can follow the variation of input voltage and gradually change, and user is input to by adjusting
The voltage of voltage input end 21 stops adjusting defeated with the colour temperature for controlling LED module after LED module changes to suitable colour temperature
The voltage entered, to obtain suitable colour temperature.
As shown in figs. 4 and 5, the power increase applied when outside to LED module, the color for the light that LED module issues
Temperature can follow the increase of power and turn cold.For example, input power, less than 2 watt-hours, the voltage that voltage stabilizing chip U1 is received is higher than
Start threshold value but lower than the pressure stabilizing value of setting, although therefore the light emission luminance of the first LED chip 24 increase, colour temperature will keep permanent
Fixed, when the power of input increases to 4 watt-hours from 2 watts, the voltage that voltage stabilizing chip U1 is received is higher than the pressure stabilizing value of setting, and first
The light emission luminance of LED chip group 24 no longer changes, and colour temperature is kept constant, and the second LED chip group 28 shines so that LED mould
The colour temperature of group increases.
Certainly, when the power of input increases, voltage will follow the increase of power and increase, and such as keeps electric current constant, passes through
Increase voltage to change the power of application.Shown in Fig. 4 is the instantaneous color temperature change of LED module during power is gradually increased
Situation, shown in fig. 5 is in the case that the power of load is maintained at 2 watts, 4 watts, 6 watts, 8 watts and 10 watts, and LED module issues
Light color temperature change situation.
Certainly, when concrete application, the first LED chip group is to issue the LED chip group of cool white light, and the second LED chip group is
The LED chip group of warm white is issued, in this way, the colour temperature of LED module warms when the voltage that voltage input end is inputted increases,
When the voltage that voltage input end is inputted reduces, the colour temperature of LED module turns cold.
Certainly, if the voltage that voltage input end 21 inputs is gradually reduced, and it is lower than the conduction threshold of switching circuit 26
When voltage, switching circuit 26 will be switched off and stop providing voltage to the second LED chip group 28, and the second LED chip group 28 is extinguished,
Namely only have the first LED chip group 24 to shine, the colour temperature for the light that LED module issues at this time is most warm colour temperature.
In actual use, not only it can control light modulator by opening the light and change input power, it can also in LED module
Radio communication circuit is set, such as bluetooth module, by wireless communication circuit receive outside control signal control light modulator
Work, and then control to voltage provided by voltage input end 21, it also can be realized the adjusting to LED module colour temperature.
Finally it is emphasized that the present invention is not limited to the above embodiments, as two groups of LED chips emit beam color
Variation, variation of specific structure of voltage regulator circuit etc. also should include within the scope of the invention as claimed.
Claims (10)
1.LED light adjusting circuit is used for LED module, including
Voltage input end and first voltage output end, second voltage output end, the first voltage output end are used for first
The power supply of LED chip group, the second voltage output end are used to power to the second LED chip group；
It is characterized by:
Be connected with voltage regulator circuit between the voltage input end and the first voltage output end, the voltage input end with it is described
Switching circuit, the voltage value that the switching circuit is inputted according to the voltage input end are connected between second voltage output end
Height and on-off；
Wherein, in the first LED chip group and the second LED chip group, wherein one group of LED chip group is warm light LED core
Piece group, another group of LED chip group are cold light LED chipset.
2. LED light adjusting circuit according to claim 1, it is characterised in that:
The switching circuit includes bleeder circuit and switch module, and the control terminal of the switch module is connected to the partial pressure electricity
On the dividing point on road, the output end of the switch module is connected to the second voltage output end.
3. LED light adjusting circuit according to claim 1 or 2, it is characterised in that:
The voltage regulator circuit includes low voltage difference voltage stabilizing chip, and the input pin of the low voltage difference voltage stabilizing chip is connected to the voltage
Input terminal, the output end of the low voltage difference voltage stabilizing chip are connected to the first voltage output end.
4. according to right want 1 or 2 described in LED light adjusting circuit, it is characterised in that:
The first LED chip group is warm light LED chip group, and the second LED chip group is cold light LED chipset；Described
When the voltage that voltage input end is inputted increases, the colour temperature that the LED module emits beam gradually turns cold.
5.LED mould group, including the first LED chip group, the second LED chip group and LED light adjusting circuit, the LED light adjusting circuit
Including voltage input end and first voltage output end, second voltage output end, the first voltage output end is to described first
The power supply of LED chip group, the second voltage output end are powered to the second LED chip group；
It is characterized by:
Be connected with voltage regulator circuit between the voltage input end and the first voltage output end, the voltage input end with it is described
Switching circuit, the voltage value that the switching circuit is inputted according to the voltage input end are connected between second voltage output end
Height and on-off；
In the first LED chip group and the second LED chip group, wherein one group is warm light LED chip group, another group is cold
Light LED chip group.
6. LED module according to claim 5, it is characterised in that:
The switching circuit includes bleeder circuit and switch module, and the control terminal of the switch module is connected to the partial pressure electricity
On the dividing point on road, the output end of the switch module is connected to the second voltage output end.
7. LED module according to claim 6, it is characterised in that:
The switch module includes first switch device and second switch device, the control terminal connection of the first switch device
To the dividing point of the bleeder circuit, an output end of the first switch device is connected to the second switch device
One output end of control terminal, the second switch device is connected to the second voltage output end.
The light-dimming method of 8.LED mould group, the LED module include the first LED chip group, the second LED chip group and LED light modulation
Circuit, the LED light adjusting circuit include voltage input end and first voltage output end, second voltage output end, and described first
Voltage output end is powered to the first LED chip group, and the second voltage output end is powered to the second LED chip group；
Also, voltage regulator circuit, the voltage input end are connected between the voltage input end and the first voltage output end
Switching circuit is connected between the second voltage output end；
It is characterized in that, this method comprises:
Voltage is provided to the voltage input end, the voltage of the voltage input end output is after the voltage regulator circuit to described
First LED chip group provides voltage, and the first LED chip group shines and colour temperature is kept constant；
When the voltage of voltage input end input is higher than the on state threshold voltage of the switching circuit, the switching circuit is led
Lead to and provide voltage to the second LED chip group, the second LED chip group shines.
9. the light-dimming method of LED module according to claim 8, it is characterised in that:
The voltage input end input voltage be higher than the switching circuit on state threshold voltage when, the switching circuit to
The second LED chip group provides the voltage up-down of the input of voltage input end described in voltage follow and goes up and down；
When the switching circuit provides voltage to the second LED chip group and increases, the brightness of the second LED chip group increases
Add；When the switching circuit, which provides voltage to the second LED chip group, to be reduced, the brightness of the second LED chip group subtracts
It is small.
10. the light-dimming method of LED module according to claim 9, it is characterised in that:
The first LED chip group is warm light LED chip group, and the second LED chip group is cold light LED chipset；
When the voltage of voltage input end input is higher than the on state threshold voltage of the switching circuit and voltage gradually rises,
The luminous colour temperature of the LED module gradually turns cold；When the voltage of the voltage input end input is gradually reduced, the LED module
Luminous colour temperature gradual warms up.
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| CN205812474U (en) * | 2016-06-23 | 2016-12-14 | 英特曼电工（常州）有限公司 | A kind of pressing type dimmer of band over-current detection |
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| US8710754B2 (en) * | 2011-09-12 | 2014-04-29 | Juno Manufacturing Llc | Dimmable LED light fixture having adjustable color temperature |
| JP2013191522A (en) * | 2012-03-15 | 2013-09-26 | Minebea Co Ltd | Illuminating device |
| US20130293124A1 (en) * | 2012-05-07 | 2013-11-07 | Lighting Science Group Corporation | System for generating light having a constant color temperature and associated methods |
| CN103415111B (en) * | 2013-07-30 | 2016-06-22 | 浙江生辉照明有限公司 | The drive circuit of LED light device and driving method |
| US10182486B2 (en) * | 2014-09-08 | 2019-01-15 | Citizen Watch Co., Ltd. | LED drive circuit |
| CN104582154A (en) * | 2014-12-24 | 2015-04-29 | 生迪光电科技股份有限公司 | Color temperature adjusting circuit and LED lighting device |
| CN204993998U (en) * | 2015-09-15 | 2016-01-20 | 厦门高贤电子科技有限公司 | Curved circuit structure of adjustable LED colour temperature |
| CN206821054U (en) * | 2017-06-15 | 2017-12-29 | 乐健科技（珠海）有限公司 | LED light adjusting circuits and LED module |
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