CN109922558A - A kind of linear constant current module adjusts the circuit and method of colour temperature - Google Patents
A kind of linear constant current module adjusts the circuit and method of colour temperature Download PDFInfo
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- CN109922558A CN109922558A CN201711330719.1A CN201711330719A CN109922558A CN 109922558 A CN109922558 A CN 109922558A CN 201711330719 A CN201711330719 A CN 201711330719A CN 109922558 A CN109922558 A CN 109922558A
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Abstract
The present invention provides the circuit and method of a kind of linear constant current module adjusting colour temperature, including power supply module；The first LED light string being connected between power supply module output end and constant-current control module output end；The second LED light string being connected between power supply module output end and constant-current control module test side；The first resistor being connected between constant-current control module test side and ground；The colour temperature of first LED light string is lower than the colour temperature of the second LED light string, and the conducting voltage of the first LED light string is lower than the conducting voltage of the second LED light string.With the increase of inputing power, the variation flowed through the electric current of the first LED light string and flow through the electric current of the second LED light string is disproportionate, changes so that the first LED light string and the second LED light string be made to export colour temperature.The present invention can be realized colour temperature and change with the variation of input voltage or electric current, at low cost without additional control；The LED branch for turning off low conducting voltage in High-current output simultaneously can effectively improve system effectiveness.
Description
Technical field
The present invention relates to IC design field, more particularly to a kind of linear constant current module adjust colour temperature circuit and
Method.
Background technique
Colour temperature be for defining a physical quantity of light source colour in light optics, the color of light source often use colour temperature this without exception
It reads to indicate.Simultaneously, the temperature of black matrix is known as the light to radiant light form and aspect to the color of source emissioning light at a certain temperature with black matrix
The colour temperature in source.In black body radiation, with temperature difference, the color of light is different, and black matrix presents --- orange red --- by red
Yellow --- the progressive formation of yellowish-white --- white --- Lan Bai.The color for the light that some light source is emitted, it appears that with black matrix at certain
When the light color emitted at one temperature is identical, this temperature of black matrix is known as the colour temperature of the light source.The temperature of " black matrix " is got over
Height, blue composition is then more in spectrum, and red composition is then fewer.For example, the photochromic of incandescent lamp is warm white, colour temperature
It is expressed as 2700K, and the colour temperature representation method of daylight fluorescent lamp is then 6000K.
Feel to change to enrich LED light source to people's bring, colour temperature often is adjusted to LED.In color-temperature regulating
In, there are two the LED light strings of different-colour, realize color-temperature regulating function by controlling the size of current difference of two lamp strings
Energy.It is as shown in Figure 1 the toning circuit temperature 1 of the prior art, two LED light strings (the first LED light string LED1 and the second LED light string
LED2 it) is parallel to 11 both ends of an input voltage generation module, and each LED light string series connection one controller (the first controller 12 respectively
And second controller 13)；The input voltage generation module 11 provides electric energy, and two LED light strings are under different current controls
Mixed light shows different color temperature changes.In the prior art, the controller of two LED light string electric currents is controlled generally by list
Two switching tubes of piece machine control are realized, as shown in Fig. 2, first switch tube Q1 is series at the defeated of the first LED light string LED1
Outlet, second switch Q2 are series at the output end of the second LED light string LED2；The first switch tube Q1 and described second
The grid end of switching tube Q2 is all connected with single-chip microcontroller 14.
Since the realization of the scheme of single-chip microcontroller and switching tube is more complicated, cost is relatively high, therefore above scheme is unsuitable for greatly
Scale uses.How the structure of toning circuit temperature is simplified, saving cost has become those skilled in the art's urgent problem to be solved
One of.
Summary of the invention
In view of at least one disadvantage of prior art described above, the purpose of the present invention is to provide a kind of linear constant current moulds
Block adjust colour temperature circuit and method, for solve in the prior art toning circuit temperature structure is complicated, at high cost the problems such as.
In order to achieve the above objects and other related objects, the present invention provides a kind of electricity of linear constant current module adjusting colour temperature
Road, the circuit that the linear constant current module adjusts colour temperature include at least:
Power supply module, the first LED light string, the second LED light string, constant-current control module and first resistor；
The anode of first LED light string is connected to the output end of the power supply module, cathode connects the current constant control
The output end of module；
The anode of second LED light string is connected to the output end of the power supply module, cathode connects the current constant control
The test side of module；
One end of the first resistor connects the test side of the constant-current control module, other end ground connection；
Wherein, the colour temperature of first LED light string is lower than the colour temperature of second LED light string, first LED light string
Conducting voltage is lower than the conducting voltage of second LED light string.
Preferably, the power supply module is variable voltage source or variable current source.
It is highly preferred that the company of the test side of the constant-current control module and second LED light string and the first resistor
Connect a second resistance of also connecting between node.
It is highly preferred that a control module is also connected between second LED light string and the first resistor, the control mould
Block includes overcurrent protection module, overheat protector module or constant-current control module.
Preferably, the constant-current control module includes power switch tube and comparator；The drain terminal of the power switch tube is made
For the test side as the constant-current control module of output end, source of the constant-current control module；The input of the comparator
End is separately connected the source and a reference voltage of the power switch tube, for the detection voltage according to the constant-current control module
And the difference of the reference voltage adjusts the power switch tube, and then realizes current constant control.
In order to achieve the above objects and other related objects, the present invention also provides the sides that a kind of linear constant current module adjusts colour temperature
Method, the method that the linear constant current module adjusts colour temperature include at least:
Initial stage, the conducting of the first LED light string with the increase of inputing power, flow through the electric current of first LED light string
Increase, current constant control is carried out to first LED light string when the electric current for flowing through first LED light string reaches predetermined current；
When institute's the second LED light string conducting, the electric current for flowing through second LED light string is gradually increased, and flows through described the
The electric current of one LED light string is gradually reduced, until being reduced to zero；
With the increase of the inputing power, flows through the electric current of first LED light string and flow through second LED light string
Electric current variation it is disproportionate, change so that first LED light string and second LED light string be made to export colour temperature；
Wherein, the colour temperature of first LED light string is lower than the colour temperature of second LED light string, first LED light string
Conducting voltage is lower than the conducting voltage of second LED light string.
Preferably, in the case that the inputing power is variable voltage, when the value of variable voltage is greater than second LED light
When the conducting voltage of string, the second LED light string conducting.
Preferably, in the case that the inputing power is variable current, after first LED constant current, the 2nd LED
Lamp string conducting.
Preferably, the method that the linear constant current module adjusts colour temperature further includes carrying out excess temperature to second LED light string
Protection, overcurrent protection or current constant control.
Preferably, flow through the electric current of first LED light string and flow through the variation of the electric current of second LED light string not at
Ratio meets following relational expression:
Vext=ILED1*R1+ILED2* R1,
Wherein, Vext is the voltage of constant-current control module test side；ILED1For the electric current for flowing through first LED light string；
R1 is to flow through the electric current of first LED light string and flow through the resistance that the electric current of second LED light string flows through jointly；ILED2For
Flow through the electric current of second LED light string.
Preferably, flow through the electric current of first LED light string and flow through the variation of the electric current of second LED light string not at
Ratio meets following relational expression:
Vext=ILED1*(R1+R2)+ILED2* R1,
Wherein, Vext is the voltage of constant-current control module test side；ILED1For the electric current for flowing through first LED light string；
It (R1+R2) is to flow through the resistance that the electric current of first LED light string flows through；ILED2For the electric current for flowing through second LED light string；
R1 is the resistance for flowing through the electric current of second LED light string and flowing through.
As described above, linear constant current module of the invention adjusts the circuit and method of colour temperature, have the advantages that
Linear constant current module of the invention adjust colour temperature circuit and method using simple structure can be realized colour temperature with
The variation of input voltage or electric current and change, it is at low cost without additional control；Low lead is turned off in High-current output simultaneously
The LED branch for the pressure that is powered can effectively improve system effectiveness.
Detailed description of the invention
Fig. 1 is shown as the schematic illustration of color-temperature regulating scheme in the prior art.
Fig. 2 is shown as color-temperature regulating circuit diagram in the prior art.
Fig. 3 is shown as the first embodiment that linear constant current module of the invention adjusts the circuit of colour temperature.
Fig. 4 is shown as the structural schematic diagram of constant-current control module of the invention.
Fig. 5 is shown as the working principle of the first embodiment of the circuit of linear constant current module adjusting colour temperature of the invention
Schematic diagram.
Fig. 6 is shown as second of embodiment that linear constant current module of the invention adjusts the circuit of colour temperature.
Fig. 7 is shown as the working principle of second of embodiment of the circuit of linear constant current module adjusting colour temperature of the invention
Schematic diagram.
Fig. 8 is shown as the third embodiment that linear constant current module of the invention adjusts the circuit of colour temperature.
Fig. 9 is shown as the working principle of the third embodiment of the circuit of linear constant current module adjusting colour temperature of the invention
Schematic diagram.
Figure 10 is shown as the 4th kind of embodiment that linear constant current module of the invention adjusts the circuit of colour temperature.
The work that Figure 11 is shown as the 4th kind of embodiment of the circuit of linear constant current module adjusting colour temperature of the invention is former
Manage schematic diagram.
Figure 12 is shown as the 5th kind of embodiment that linear constant current module of the invention adjusts the circuit of colour temperature.
The work that Figure 13 is shown as the 5th kind of embodiment of the circuit of linear constant current module adjusting colour temperature of the invention is former
Manage schematic diagram.
Figure 14 is shown as the 6th kind of embodiment that linear constant current module of the invention adjusts the circuit of colour temperature.
Component label instructions
1 toning circuit temperature
11 input voltage generation modules
12 first controllers
13 second controllers
14 single-chip microcontrollers
The circuit of 2 linear constant current modules adjusting colour temperature
21 variable voltage sources
22 constant-current control modules
221 comparators
23 variable current sources
24 integrated chips
241 first constant-current control modules
242 second constant-current control modules
243 overheat protector modules
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Please refer to Fig. 3~Figure 14.It should be noted that diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, only shown in schema then with related component in the present invention rather than package count when according to actual implementation
Mesh, shape and size are drawn, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its
Assembly layout kenel may also be increasingly complex.
Embodiment one
As shown in figure 3, the present embodiment provides the circuit 2 that a kind of linear constant current module adjusts colour temperature, the linear constant current mould
Block adjust colour temperature circuit 2 include:
Variable voltage source 21, the first LED light string LED1, the second LED light string LED2, constant-current control module 22 and first resistor
R1。
As shown in figure 3, the variable voltage source 21 lights the first LED light string LED1 and described second for providing
The input voltage vin of LED light string LED2.
As shown in figure 3, the anode of the first LED light string LED1 is connected to the output end of the variable voltage source 21, bears
Pole connects the output end OUT of the constant-current control module 22；The anode of the second LED light string LED2 be connected to it is described can power transformation
Output end, the cathode of potential source 21 connect the test side ext of the constant-current control module 22.
Specifically, the colour temperature of the first LED light string LED1 is lower than the colour temperature of the second LED light string LED2, and described the
The conducting voltage of one LED light string LED1 is lower than the conducting voltage of the second LED light string LED2.
As shown in figure 3, the test side ext of the constant-current control module 22 after the first resistor R1 by being grounded, it is described
The reference ground GND of constant-current control module 22 is grounded.The constant-current control module 22 is to flowing through the first LED light string LED1's
Electric current ILED1Current constant control is carried out, and then influences to flow through the electric current I of the second LED light string LED2LED2, make to flow through described first
The electric current I of LED light string LED1LED1And flow through the electric current I of the second LED light string LED2LED2Variation it is disproportionate, thus real
The adjusting of existing colour temperature.
Specifically, as shown in figure 4, in the present embodiment, the constant-current control module 22 includes power switch tube Q and compares
Device 221；The drain terminal of the power switch tube Q is as the output end OUT of the constant-current control module 22, source as the constant current
The test side ext of control module 22；The inverting input terminal of the comparator 221 connects the source of the power switch tube Q, positive
Input terminal connects a reference voltage Vref, the comparator 221 according to the detection voltage Vext of the constant-current control module 22 and
The difference of the reference voltage Vref adjusts the power switch tube Q, and then realizes current constant control, when first LED light string
When LED1 constant current, the detection voltage Vext of the constant-current control module 22 stablizes in the reference voltage Vref；In practical application
In, the input terminal polarity of the comparator 221 can be exchanged by increasing phase inverter, be not limited to this embodiment.The constant current
The specific structure of control module 22 is unlimited, and the circuit structure of any achievable current constant control is applicable in this present embodiment described
Constant-current control module 22, is not limited to this embodiment.
As shown in figure 5, the working principle for the circuit 2 that the linear constant current module in this implementation adjusts colour temperature is as follows:
When the input voltage vin is higher than the conducting voltage V of the first LED light string LED1LED1When, the first LED
Lamp string LED1 conducting；With the raising of the input voltage vin, the electric current I of the first LED light string LED1 is flowed throughLED1Gradually
Increase, the voltage generated on the first resistor R1 also gradually rises (at this time due to the conducting of the second LED light string LED2
Voltage VLED2Higher, the second LED light string LED2 is not turned on)；When the voltage Vext on the first resistor R1 reaches institute
After stating reference voltage Vref, the voltage that the constant-current control module 22 controls the test side ext of the constant-current control module 22 is protected
Hold it is constant so that flowing through the electric current I of the first LED light string LED1LED1It remains unchanged.
The input voltage vin continues to increase, when the input voltage vin leading higher than the second LED light string LED2
The pressure that is powered VLED2When, the second LED light string LED2 begins with electric current and flows through, due to flowing through the first LED light string LED1's
Electric current ILED1With the electric current I for flowing through the second LED light string LED2LED2Meet relational expression: Vext=ILED1*R1+ILED2* R1, this
When, the voltage Vext of the test side ext of the constant-current control module 22 is constant in the reference voltage Vref, therefore, flows through institute
State the electric current I of the second LED light string LED2LED2While rising, the electric current I of the first LED light string LED1 is flowed throughLED1It will reduce,
Electric current I until flowing through the first LED light string LED1LED1It is reduced to zero, to maintain above-mentioned equation to set up.With the input electricity
Pressure Vin's continues to increase, and flows through the electric current I of the second LED light string LED2LED2The voltage generated on the first resistor R1
Vext can be higher than the reference voltage Vref, close the first LED light string LED1 so as to cause the constant-current control module 22
It is disconnected.
With the increase of the input voltage vin, the electric current I of the first LED light string LED1 is flowed throughLED1It is described with flowing through
The electric current I of second LED light string LED2LED2Variation it is disproportionate, be changed to export colour temperature.
Embodiment two
As shown in fig. 6, the line the present embodiment provides the circuit 2 that a kind of linear constant current module adjusts colour temperature, in the present embodiment
Property constant flow module adjust colour temperature circuit and embodiment one the difference is that, using variable current source 23 power.
Specifically, the variable current source 23 is connected to the first LED light string LED1 and the second LED light string LED2
Input terminal and ground between.The variable current source 23 lights the first LED light string LED1 and the 2nd LED for providing
The input current Iin of lamp string LED2.Other modules and device in the present embodiment are identical as the structure of embodiment one, different herein
One repeats.
As shown in fig. 7, the working principle for the circuit 2 that the linear constant current module in this implementation adjusts colour temperature is as follows:
With the increase of the input current Iin, since the impedance comparison of the first LED light string LED1 is small, institute
It states input current Iin and firstly flows through the first LED light string LED1 (the second LED light string LED2 is not turned at this time), flow through institute
State the electric current I of the first LED light string LED1LED1Increase with the increase of the input current Iin.When flowing through the first LED
The electric current I of lamp string LED1LED1It is described when the voltage Vext generated on the first resistor R1 reaches the reference voltage Vref
The voltage Vext of the test side ext of constant-current control module 22 is remained unchanged and (is stable at the reference voltage Vref).
When the voltage Vext generated on the first resistor R1 reaches the reference voltage Vref, second LED light
String LED2 is begun to turn on, and flows through the electric current I of the second LED light string LED2LED2Quickly increase, due to flowing through described first
The electric current I of LED light string LED1LED1With the electric current I for flowing through the second LED light string LED2LED2Meet relational expression: Vext=ILED1*
R1+ILED2* R1, at this point, the voltage Vext of the test side ext of the constant-current control module 22 is constant in the reference voltage
Vref.Therefore, the electric current I of the second LED light string LED2 is flowed throughLED2While rapid increase, first LED light string is flowed through
The electric current I of LED1LED1To quickly it reduce, to maintain above-mentioned equation to set up.Continue to increase with the input current Iin, flow
Cross the electric current I of second LED light stringLED2The pressure drop generated on the first resistor R1 is higher than the constant-current control module 22
Test side ext voltage Vext, the first LED light string LED1 is turned off, and the input current Iin flows through described second
LED light string LED2.
With the increase of the input current Iin, the electric current I of the first LED light string LED1 is flowed throughLED1It is described with flowing through
The electric current I of second LED light string LED2LED2Variation it is disproportionate, be changed to export colour temperature.
Embodiment three
As shown in figure 8, the line the present embodiment provides the circuit 2 that a kind of linear constant current module adjusts colour temperature, in the present embodiment
Property constant flow module adjust colour temperature circuit and embodiment two the difference is that, the test side of the constant-current control module 22
Also connect a second resistance R2 between ext and the connecting node of the second LED light string LED2 and the first resistor R1.It is described
Second resistance R2 makes the electric current I for flowing through the first LED light string LED1LED1And flow through the second LED light string LED2's
Electric current ILED2The inflection point range of variation broadens, and practicability is higher.Other modules and device and embodiment two in the present embodiment
Structure is identical, will not repeat them here.
As shown in figure 9, the working principle for the circuit 2 that the linear constant current module in this implementation adjusts colour temperature is as follows:
With the increase of the input current Iin, since the impedance comparison of the first LED light string LED1 is small, institute
It states input current Iin and firstly flows through the first LED light string LED1 (the second LED light string LED2 is not turned at this time), flow through institute
State the electric current I of the first LED light string LED1LED1Increase with the increase of the input current Iin.When flowing through the first LED
The electric current I of lamp string LED1LED1It is described when the voltage Vext generated on the first resistor R1 reaches the reference voltage Vref
The voltage Vext of the test side ext of constant-current control module 22 is remained unchanged and (is stable at the reference voltage Vref).
When the voltage Vext generated on the first resistor R1 reaches the reference voltage Vref, second LED light
String LED2 is begun to turn on, and flows through the electric current I of the second LED light string LED2LED2It is gradually increased, due to flowing through described first
The electric current I of LED light string LED1LED1With the electric current I for flowing through the second LED light string LED2LED2Meet relational expression: Vext=ILED1*
(R1+R2)+ILED2* R1, at this point, the voltage Vext of the test side ext of the constant-current control module 22 is constant in the reference electricity
Therefore pressure Vref flows through the electric current I of the second LED light string LED2LED2While rising, first LED light string is flowed through
The electric current I of LED1LED1It will reduce, to maintain above-mentioned equation to set up.Continue to increase with the input current Iin, flows through institute
State the electric current I of the second LED light stringLED2The pressure drop generated on the first resistor R1 is higher than the inspection of the constant-current control module 22
The voltage Vext of end ext is surveyed, the first LED light string LED1 is turned off, and the input current Iin flows through the 2nd LED
Lamp string LED2.
With the increase of the input current Iin, the electric current I of the first LED light string LED1 is flowed throughLED1It is described with flowing through
The electric current I of second LED light string LED2LED2Variation it is disproportionate, be changed to export colour temperature.
Example IV
As shown in Figure 10, the present embodiment provides the circuits 2 that a kind of linear constant current module adjusts colour temperature, the line in the present embodiment
Property constant flow module adjust colour temperature circuit and embodiment three the difference is that, using variable voltage source 21 power.This implementation
Other modules and device in example are identical as the structure of embodiment three, will not repeat them here.
As shown in figure 11, the working principle of the circuit 2 of the linear constant current module adjusting colour temperature in this implementation is as follows:
When the input voltage vin is higher than the conducting voltage V of the first LED light string LED1LED1When, the first LED
Lamp string LED1 conducting；With the raising of the input voltage vin, the electric current I of the first LED light string LED1 is flowed throughLED1Gradually
Increase, the voltage generated on the first resistor R1 and the second resistance R2 also gradually rises (at this time due to described second
The conducting voltage V of LED light string LED2LED2Higher, the second LED light string LED2 is not turned on)；When the first resistor R1 with
After the sum of voltage on second resistance R2 Vext reaches the reference voltage Vref, the constant-current control module 22 controls institute
The voltage for stating the test side ext of constant-current control module 22 remains unchanged, so that flowing through the electricity of the first LED light string LED1
Flow ILED1It remains unchanged.
The input voltage vin continues to increase, when the input voltage vin leading higher than the second LED light string LED2
The pressure that is powered VLED2When, the second LED light string LED2 begins with electric current and flows through, and flows through the electric current of the first LED light string LED1
ILED1With the electric current I for flowing through the second LED light string LED2LED2Meet following relationship: Vext=ILED1*(R1+R2)+ILED2*
R1, at this point, the voltage Vext of the test side ext of the constant-current control module 22 is constant in the reference voltage Vref, therefore, stream
Cross the electric current I of the second LED light string LED2LED2While rising, the electric current I of the first LED light string LED1 is flowed throughLED1It will
Reduce, the electric current I until flowing through the first LED light string LED1LED1It is reduced to zero, to maintain above-mentioned equation to set up.With described
Input voltage vin continues to increase, and flows through the electric current I of the second LED light string LED2LED2It is generated on the first resistor R1
Voltage Vext can be higher than the reference voltage Vref, so as to cause the constant-current control module 22 by first LED light string
LED1 shutdown.
With the increase of the input voltage vin, the electric current I of the first LED light string LED1 is flowed throughLED1It is described with flowing through
The electric current I of second LED light string LED2LED2Variation it is disproportionate, be changed to export colour temperature.
Embodiment five
As shown in figure 12, the present embodiment provides the circuit 2 that a kind of linear constant current module adjusts colour temperature, the present embodiment provides one
A Integrated Solution.
Specifically, power supply module is set as direct current input current or input voltage, in the present embodiment, power supply module mentions
For DC input voitage.
Specifically, to the first LED light string LED1 and the second LED light string LED2 by integrated chip 24 respectively into
Row current constant control.The integrated chip 24 includes the first constant-current control module 241 and the second constant-current control module 242, will be described
First output end OUT1 of the drain terminal of power switch tube Q in first constant-current control module 241 as the integrated chip 24, will
Second output terminal of the drain terminal of power switch tube Q in second constant-current control module 242 as the integrated chip 24
OUT2, using the test side of first constant-current control module 241 and second constant-current control module 242 as the integrated core
The public test side ext of piece 24 is connect with outside first resistor R1.Change inflection point by the first resistor R1 setting electric current, with
The variation of input voltage or input current flow through the electric current of two paths of LED and can accordingly change, and then change colour temperature.Described first is permanent
Flow control module 241 and the structure of second constant-current control module 242 can be with the current constant control moulds in embodiment one
Block 22 is identical, can also be different；The electricity that first constant-current control module 241 and second constant-current control module 242 use
Line structure may be the same or different；It will not repeat them here.
As shown in figure 13, the linear constant current module in this implementation adjusts the working principle and embodiment one of the circuit 2 of colour temperature
Working principle it is essentially identical, the difference is that, after the second LED light string LED2 conducting, flow through second LED light string
The electric current of LED2 is gradually increased, when the voltage of the test side of second constant-current control module 242 reaches the reference of inner setting
When voltage Vref2, the electric current for flowing through the second LED light string LED2 is constant.
Embodiment six
As shown in figure 14, the present embodiment provides a kind of Integrated Solutions, with embodiment five the difference is that, described second
Constant-current control module 242 replaces with overheat protector module 243.
Specifically, power supply module is set as direct current input current or input voltage, in the present embodiment, power supply module mentions
For direct current input current.
Specifically, one end of the overheat protector module 243 connects as the second output terminal OUT2 of the integrated chip 24
Meet the public test side ext and external first resistor R1 of the second LED light string LED2, the other end as the integrated chip 24
Connection；One end of second resistance R2 connects the test side of first constant-current control module 241, and the other end connects the integrated core
The public test side ext of piece 24.
The overheat protector module 243 can be replaced overcurrent protection module；Arbitrarily it is connected to the second LED light string LED2
Between the first resistor R1, this replaceable implementation of the module that the second LED light string LED2 is protected or controlled
Overheat protector module 243 in example, will not repeat them here.
In conclusion the present invention provides the circuit and method of a kind of linear constant current module adjusting colour temperature, including power supply module；
Anode is connected to the first LED light string of the output end of power supply module, cathode connection constant-current control module output end；Anode is connected to
Output end, the cathode of power supply module connect the second LED light string of constant-current control module test side；It is connected to constant-current control module inspection
Survey the first resistor between end and ground；The colour temperature of first LED light string is lower than the colour temperature of the second LED light string, and the first LED light string is led
Energization is forced down in the conducting voltage of the second LED light string.With the increase of inputing power, the electric current of first LED light string is flowed through
And flow through the electric current of second LED light string variation it is disproportionate, to make first LED light string and the 2nd LED
Lamp string output colour temperature changes.Linear constant current module of the invention adjusts the circuit of colour temperature and method uses simple structure energy
Enough realize that colour temperature changes with the variation of input voltage or electric current, it is at low cost without additional control；It is defeated in high current simultaneously
The LED branch that low conducting voltage is turned off when out can effectively improve system effectiveness.So the present invention effectively overcomes the prior art
In various shortcoming and have high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (11)
1. the circuit that a kind of linear constant current module adjusts colour temperature, which is characterized in that the linear constant current module adjusts the electricity of colour temperature
Road includes at least:
Power supply module, the first LED light string, the second LED light string, constant-current control module and first resistor；
The anode of first LED light string is connected to the output end of the power supply module, cathode connects the constant-current control module
Output end；
The anode of second LED light string is connected to the output end of the power supply module, cathode connects the constant-current control module
Test side；
One end of the first resistor connects the test side of the constant-current control module, other end ground connection；
Wherein, the colour temperature of first LED light string is lower than the colour temperature of second LED light string, the conducting of first LED light string
Voltage is lower than the conducting voltage of second LED light string.
2. the circuit that linear constant current module according to claim 1 adjusts colour temperature, it is characterised in that: the power supply module is
Variable voltage source or variable current source.
3. the circuit that linear constant current module according to claim 1 or 2 adjusts colour temperature, it is characterised in that: the constant current control
It also connects between the test side of molding block and second LED light string and the connecting node of the first resistor second resistance.
4. the circuit that linear constant current module according to claim 3 adjusts colour temperature, it is characterised in that: second LED light
It is also connected with a control module between string and the first resistor, the control module includes overcurrent protection module, overheat protector mould
Block or constant-current control module.
5. the circuit that linear constant current module according to claim 1 adjusts colour temperature, it is characterised in that: the current constant control mould
Block includes power switch tube and comparator；Output end of the drain terminal of the power switch tube as the constant-current control module, source
Hold the test side as the constant-current control module；The input terminal of the comparator is separately connected the source of the power switch tube
And a reference voltage, for adjusting the function according to the detection voltage of the constant-current control module and the difference of the reference voltage
Rate switching tube, and then realize current constant control.
6. a kind of method that linear constant current module adjusts colour temperature, which is characterized in that the linear constant current module adjusts the side of colour temperature
Method includes at least:
Initial stage, the conducting of the first LED light string, with the increase of inputing power, the electric current for flowing through first LED light string increases
Greatly, current constant control is carried out to first LED light string when the electric current for flowing through first LED light string reaches predetermined current；
When institute's the second LED light string conducting, the electric current for flowing through second LED light string is gradually increased, and flows through the first LED
The electric current of lamp string is gradually reduced, until being reduced to zero；
With the increase of the inputing power, flows through the electric current of first LED light string and flow through the electricity of second LED light string
The variation of stream is disproportionate, changes so that first LED light string and second LED light string be made to export colour temperature；
Wherein, the colour temperature of first LED light string is lower than the colour temperature of second LED light string, the conducting of first LED light string
Voltage is lower than the conducting voltage of second LED light string.
7. the method that linear constant current module according to claim 6 adjusts colour temperature, it is characterised in that: the inputing power is
In the case where variable voltage, when the value of variable voltage is greater than the conducting voltage of second LED light string, second LED light
String conducting.
8. the method that linear constant current module according to claim 6 adjusts colour temperature, it is characterised in that: the inputing power is
In the case where variable current, after first LED constant current, the second LED light string conducting.
9. the method that linear constant current module according to claim 7 or 8 adjusts colour temperature, it is characterised in that: the linear perseverance
The method that flow module adjusts colour temperature further includes carrying out overheat protector, overcurrent protection or current constant control to second LED light string.
10. the method that linear constant current module according to claim 6 adjusts colour temperature, it is characterised in that: flow through described first
The electric current of LED light string and the variation of electric current for flowing through second LED light string disproportionate meet following relational expression:
Vext=ILED1*R1+ILED2* R1,
Wherein, Vext is the voltage of constant-current control module test side；ILED1For the electric current for flowing through first LED light string；R1 is stream
It crosses the electric current of first LED light string and flows through the resistance that the electric current of second LED light string flows through jointly；ILED2To flow through
State the electric current of the second LED light string.
11. the method that linear constant current module according to claim 6 adjusts colour temperature, it is characterised in that: flow through described first
The electric current of LED light string and the variation of electric current for flowing through second LED light string disproportionate meet following relational expression:
Vext=ILED1*(R1+R2)+ILED2* R1,
Wherein, Vext is the voltage of constant-current control module test side；ILED1For the electric current for flowing through first LED light string；(R1+
It R2) is to flow through the resistance that the electric current of first LED light string flows through；ILED2For the electric current for flowing through second LED light string；
R1 is the resistance for flowing through the electric current of second LED light string and flowing through.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112038152A (en) * | 2020-09-07 | 2020-12-04 | 欧科佳（上海）汽车电子设备有限公司 | Backlight and state indicating circuit of rocker switch of commercial vehicle |
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| CN105792408A (en) * | 2015-01-09 | 2016-07-20 | 松下知识产权经营株式会社 | Illumination system and luminaire |
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| CN107094329A (en) * | 2017-05-03 | 2017-08-25 | 矽力杰半导体技术(杭州)有限公司 | Led drive circuit |
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| CN105792408A (en) * | 2015-01-09 | 2016-07-20 | 松下知识产权经营株式会社 | Illumination system and luminaire |
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| CN112038152A (en) * | 2020-09-07 | 2020-12-04 | 欧科佳（上海）汽车电子设备有限公司 | Backlight and state indicating circuit of rocker switch of commercial vehicle |
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