CN106304525A - The LED drive circuit of adjustable color temperature - Google Patents
The LED drive circuit of adjustable color temperature Download PDFInfo
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- CN106304525A CN106304525A CN201510293642.XA CN201510293642A CN106304525A CN 106304525 A CN106304525 A CN 106304525A CN 201510293642 A CN201510293642 A CN 201510293642A CN 106304525 A CN106304525 A CN 106304525A
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Abstract
The LED drive circuit that the present invention relates to a kind of adjustable color temperature generates vibration triangular wave by described oscillation module, then is regulated the dutycycle of the pwm signal of output according to vibration triangular wave by described PWM control module.After described first drives module and described reverse comparison module to receive pwm signal, described reverse comparison module is to carrying out reverse process, and the pwm signal after processing exports and drives module to second.I.e. first complementary duty cycle driving module and the second pwm signal driving module to receive.Therefore, module and described second is driven to drive the described first LED group of module control and the luminosity power complementation of described second LED group by described first respectively, thus the dutycycle changing input pwm signal can regulate described first LED group and the luminosity of described second LED group, and then change described first LED group and the colour temperature of described second LED group.
Description
Technical field
The present invention relates to LED drive circuit, particularly relate to a kind of easy operation, be suitable for the adjustable of multiple occasion
The LED drive circuit of colour temperature.
Background technology
Colour temperature is to represent the yardstick that light source is photochromic, and unit is K (Kelvin).Colour temperature is being photographed, is recording, is being gone out
The fields such as version have important application.The colour temperature of light source is to be radiated by the color and theoretical hot dark matter contrasting it
Body determines.The kelvin degree when color of hot dark matter radiant body and light source matches is exactly that light source
Colour temperature, it is directly associated with Planck blackbody radiation law.Currently used office illumination lamp is basic
It is based on cool white dichromatism.And colour temperature is fixed after lamp installation, colour temperature i.e. cannot be changed.And people exists for a long time
Easily cause eyestrain under cool white colour temperature environment, and work efficiency is low.
Summary of the invention
Based on this, it is necessary to a kind of easy operation, be suitable for the LED drive circuit of the adjustable color temperature of multiple occasion.
The LED drive circuit of a kind of adjustable color temperature, for being adjusted, including shaking the colour temperature of LED group
Swing module, PWM control module, reverse comparison module, the first driving module and the second driving module；
Described oscillation module is used for generating vibration triangular wave and exports to described PWM control module；Described PWM
Control module is for the dutycycle of the pwm signal according to the regulation output of described vibration triangular wave；Described first drives
Dynamic model block and described reverse comparison module are used to receive the pwm signal of described PWM control module output；
Described reverse comparison module, for described pwm signal is carried out reverse process, makes this PWM after process believe
Number with the complementary duty cycle of pwm signal of described PWM control module output, the PWM letter after processing
Number output to second drive module；Described first drives module for controlling and it according to the pwm signal received
The luminosity of the first LED group connected；Described second drives module for according to the PWM letter received
Number control connected second LED group luminosity.
Wherein in an embodiment, also including Voltage stabilizing module, described Voltage stabilizing module is for steady by input voltage
It is scheduled on load voltage value and described load voltage value is exported controls mould to described oscillation module, described PWM
Block, described reverse comparison module, described first driving module and described second drive module.
Wherein in an embodiment, described Voltage stabilizing module includes diode D3, electrochemical capacitor C7, electrolysis electricity
Hold C4, audion Q5, stabilivolt D4 and resistance R22；
The positive pole of described diode D3 connects described input voltage, negative pole connects described first LED group and described
Second LED group；The positive pole of described electrochemical capacitor C7 connects the negative pole of described diode D3, minus earth；
The plus earth of described stabilivolt D4, negative pole connect the base stage of described audion Q5；Described audion Q5's
Emitter stage connects the positive pole of described electrochemical capacitor C4, colelctor electrode connects the negative pole of described diode D3；Described electrolysis
The minus earth of electric capacity C4；Described resistance R22 is electrically connected the positive pole of described electrochemical capacitor C7 and described
The negative pole of stabilivolt D4.
Wherein in an embodiment, also include the VRM Voltage Regulator Module for regulating input voltage size, institute
The output stating VRM Voltage Regulator Module terminates the input of described PWM control module.
Wherein in an embodiment, described VRM Voltage Regulator Module includes voltage regulator, described voltage-regulation
Device is used for regulating input voltage size, and is exported by input voltage to described PWM control module.
Wherein in an embodiment, described oscillation module includes resistance R1, resistance R2, resistance R3, electricity
Resistance R4, resistance R13, diode D1, electric capacity C1 and comparator U1A；
Described resistance R1, described resistance R2 are series between input voltage and ground connection；Described resistance R4, institute
State resistance R3, described electric capacity C1 is sequentially connected in series between input voltage and ground connection；Described diode D1 is just
Pole connects described resistance R4 and the points of common connection of described resistance R3, negative pole and connects the output of described comparator U1A
End；Described resistance R13 connects the negative pole of described diode D1 and the homophase input of described comparator U1A respectively
End；The in-phase input end of described comparator U1A connects the points of common connection of described resistance R1 and described resistance R2；
The anti-phase input of described comparator U1A terminates the points of common connection of described resistance R3 and described electric capacity C1, institute
The inverting input stating comparator U1A is additionally operable to connect described PWM control module.
Wherein in an embodiment, described PWM control module includes resistance R5, resistance R6, resistance
R23, electric capacity C2, resistance R10, stabilivolt D2 and comparator U1B；
Described resistance R5, described resistance R23 are sequentially connected in series in the homophase of input voltage Yu described comparator U1B
Between input；Described resistance R6 mono-terminates the points of common connection of described resistance R5 and described resistance R23,
Other end ground connection；The in-phase input end of the one described comparator U1B of termination of described electric capacity C2, another termination
Ground；Another termination of output the termination described resistance R10, described resistance R10 of described comparator U1B is described
The negative pole of stabilivolt D2, the positive pole of described stabilivolt D2 connects described first and drives module and described reversely compare
Module.
Wherein in an embodiment, described reverse comparison module include resistance R7, resistance R8, resistance R9,
Comparator U2A, resistance R12 and resistance R14；
The inverting input of the one described comparator U2A of termination of described resistance R8, another terminates described PWM
The outfan of control module；The one termination input voltage of described resistance R7, another terminates described comparator U2A
In-phase input end；The in-phase input end of the one described comparator U2A of termination of described resistance R9, the other end
Ground connection；Described resistance R12 mono-terminates the outfan of described comparator U2A, other end ground connection；Described resistance
The outfan of the one described comparator U2A of termination of R14, another termination described second drives module.
Wherein in an embodiment, described first drives module to include resistance R11, resistance R15, resistance
R16, resistance R17, resistance R18, audion Q1 and field effect transistor Q3；
Described resistance R11 one end is connected with described resistance R15, and described resistance R11 is away from described resistance R15
One end ground connection；Described resistance R15 is away from the base stage of the described audion Q1 of termination of described resistance R11；
The points of common connection of described resistance R11 and described resistance R15 connects described PWM control module；Described three poles
The grounded emitter of pipe Q1, the colelctor electrode of described audion Q1 meets described resistance R16 and described resistance R17；
Described resistance R16 is away from a termination input voltage of described audion Q1, and described resistance R17 is away from described
The grid of one described field effect transistor Q3 of termination of audion Q1；The one described resistance of termination of described resistance R18
R17 and the points of common connection of described field effect transistor Q3, other end ground connection；The source electrode of described field effect transistor Q3
Ground connection, the drain electrode of described field effect transistor Q3 connects described first LED group.
Wherein in an embodiment, described second drive module include resistance R19, resistance R20 resistance R21,
Audion Q2 and field effect transistor Q4；
The base stage of described audion Q2 connects described reverse comparison module, the grounded emitter of described audion Q2,
The colelctor electrode of described audion Q2 meets described resistance R19 and described resistance R20；Described resistance R19 away from
The one termination input voltage of described audion Q2, described resistance R20 is away from a termination of described audion Q2
The grid of described field effect transistor Q4；The one described resistance R20 of termination of described resistance R21 and described field effect
The points of common connection of pipe Q4, other end ground connection；The source ground of described field effect transistor Q4, described field effect
The drain electrode of pipe Q4 connects described second LED group.
The LED drive circuit of above-mentioned adjustable color temperature generates vibration triangular wave by described oscillation module, then by institute
State the PWM control module dutycycle according to the pwm signal of vibration triangular wave regulation output.Described first drives
After dynamic model block and described reverse comparison module receive pwm signal, described reverse comparison module is to reversely locating
Reason, and will process after pwm signal export to second drive module.I.e. first drives module to drive with second
The complementary duty cycle of the pwm signal that module receives.Therefore, module and described the are driven by described first respectively
The luminosity of the two described first LED groups driving module control and described second LED group is strong and weak mutually
Mend, thus the dutycycle changing input pwm signal can regulate described first LED group and described second
The luminosity of LED group, and then change described first LED group and the color of described second LED group
Temperature.
Accompanying drawing explanation
Fig. 1 is the module map of the LED drive circuit of adjustable color temperature；
Fig. 2 is the schematic diagram of the LED drive circuit of adjustable color temperature.
Detailed description of the invention
As it is shown in figure 1, be the module map of the LED drive circuit of adjustable color temperature.
The LED drive circuit of a kind of adjustable color temperature, for being adjusted, including shaking the colour temperature of LED group
Swing module 101, PWM (Pulse Width Modulation, pulse width modulation) control module 102, anti-
Module 104 and second is driven to drive module 105 to comparison module 103, first.
Described oscillation module 101 is used for generating vibration triangular wave and exports to described PWM control module 102；Institute
State the PWM control module 102 duty for the pwm signal according to the regulation output of described vibration triangular wave
Ratio；Described first drives module 104 and described reverse comparison module 104 to be used to receive described PWM controls
The pwm signal of module 102 output；Described reverse comparison module 103 is for carrying out described pwm signal
Reverse process, makes the PWM letter of this pwm signal after process and the output of described PWM control module 102
Number complementary duty cycle, will process after pwm signal export to second drive module 105；Described first drives
Dynamic model block 104 for controlling the luminance of connected first LED group according to the pwm signal received
Degree；Described second drives module 105 for controlling connected 2nd LED according to the pwm signal received
The luminosity of lamp group.
Described oscillation module 101 is used for exporting vibration triangular wave.
Described PWM control module 102 is for the PWM letter according to vibration triangular wave output duty ratio corresponding
Number.
Described reverse comparison module 103 is carried out instead for pwm signal PWM control module 102 exported
To process so that it is with the complementary duty cycle of the pwm signal of PWM control module 102 output.
Described first drives module 104 to be connected with described first LED group, for according to the PWM received
The change in duty cycle of signal controls the conducting change in duty cycle of self, thus changes and flow through described first LED
The electric current of group, and then change the brightness flop of described first LED group.
Corresponding, described second drives module 105 to be connected with described second LED group, for according to reception
The change in duty cycle of pwm signal control self conducting change in duty cycle, thus change and flow through described second
The electric current of LED group, and then change the brightness flop of described second LED group.
Owing to output drives the pwm signal dutycycle of module 104 to drive to described second with output to described first
The pwm signal complementary duty cycle of dynamic model block 105.Therefore, corresponding, flow through described first LED group
Complementary with the electric current power of described second LED group.It is assumed that output drives module 104 to described first
Pwm signal dutycycle is 0.6, exports the pwm signal dutycycle to described second driving module 105 and is
0.4.So corresponding, drive with described first the brightness of the first LED group that module 104 is connected be more than with
The brightness of the described second the second LED group driving module 105 connection.
Therefore, after changing input voltage size, export and drive module 104 and described second to described first
The dutycycle correspondence driving the pwm signal of module 105 changes such that it is able to change a described LED
Lamp group and the brightness of described second LED group, and then play the effect of regulation colour temperature.
Incorporated by reference to Fig. 2.
The LED drive circuit of adjustable color temperature also includes Voltage stabilizing module 106, and described Voltage stabilizing module 106 is used for will
Stabilized input voltage is at load voltage value and is exported by described load voltage value to described oscillation module, PWM control
Molding block, reverse comparison module, the first driving module and second drive module.
Voltage stabilizing module 106 includes diode D3, electrochemical capacitor C7, electrochemical capacitor C4, audion Q5, steady
Pressure pipe D4 and resistance R22.
The positive pole of described diode D3 connects described input voltage, negative pole connects described first LED group and described
Second LED group；The positive pole of described electrochemical capacitor C7 connects the negative pole of described diode D3, minus earth；
The plus earth of described stabilivolt D4, negative pole connect the base stage of described audion Q5；Described audion Q5's
Emitter stage connects the positive pole of described electrochemical capacitor C4, colelctor electrode connects the negative pole of described diode D3；Described electrolysis
The minus earth of electric capacity C4；Described resistance R22 is electrically connected the positive pole of described electrochemical capacitor C7 and described
The negative pole of stabilivolt D4.
The LED drive circuit of adjustable color temperature also includes the VRM Voltage Regulator Module for regulating input voltage size
(not shown), the output of described VRM Voltage Regulator Module (not shown) terminates described PWM control module 102
Input.
VRM Voltage Regulator Module (not shown) includes that voltage regulator, described voltage regulator are used for regulating input
Voltage swing, and input voltage is exported to described PWM control module 102.
Oscillation module 101 includes resistance R1, resistance R2, resistance R3, resistance R4, resistance R13, two poles
Pipe D1, electric capacity C1 and comparator U1A.
Described resistance R1, described resistance R2 are series between input voltage and ground connection；Described resistance R4, institute
State resistance R3, described electric capacity C1 is sequentially connected in series between input voltage and ground connection；Described diode D1 is just
Pole connects described resistance R4 and the points of common connection of described resistance R3, negative pole and connects the output of described comparator U1A
End；Described resistance R13 connects the negative pole of described diode D1 and the homophase input of described comparator U1A respectively
End；The in-phase input end of described comparator U1A connects the points of common connection of described resistance R1 and described resistance R2；
The anti-phase input of described comparator U1A terminates the points of common connection of described resistance R3 and described electric capacity C1, institute
The inverting input stating comparator U1A is additionally operable to connect described PWM control module 102.
PWM control module 102 include resistance R5, resistance R6, resistance R23, electric capacity C2, resistance R10,
Stabilivolt D2 and comparator U1B.
Described resistance R5, described resistance R23 are sequentially connected in series in the homophase of input voltage Yu described comparator U1B
Between input；Described resistance R6 mono-terminates the points of common connection of described resistance R5 and described resistance R23,
Other end ground connection；The in-phase input end of the one described comparator U1B of termination of described electric capacity C2, another termination
Ground；Another termination of output the termination described resistance R10, described resistance R10 of described comparator U1B is described
The negative pole of stabilivolt D2, the positive pole of described stabilivolt D2 connect described first drive module 104 and described reversely
Comparison module 103.
Reversely comparison module 103 includes resistance R7, resistance R8, resistance R9, comparator U2A, resistance R12
And resistance R14.
The inverting input of the one described comparator U2A of termination of described resistance R8, another terminates described PWM
The outfan of control module 102；The one termination input voltage of described resistance R7, another terminates described comparator
The in-phase input end of U2A；The in-phase input end of the one described comparator U2A of termination of described resistance R9, separately
One end ground connection；Described resistance R12 mono-terminates the outfan of described comparator U2A, other end ground connection；Described
The outfan of the one described comparator U2A of termination of resistance R14, another termination described second drives module 105.
First drives module 104 to include resistance R11, resistance R15, resistance R16, resistance R17, resistance
R18, audion Q1 and field effect transistor Q3.
Described resistance R11 one end is connected with described resistance R15, and described resistance R11 is away from described resistance R15
One end ground connection；Described resistance R15 is away from the base stage of the described audion Q1 of termination of described resistance R11；
The points of common connection of described resistance R11 and described resistance R15 connects described PWM control module 102；Described
The grounded emitter of audion Q1, the colelctor electrode of described audion Q1 connects described resistance R16 and described resistance
R17；Described resistance R16 away from described audion Q1 one termination input voltage, described resistance R17 away from
The grid of one described field effect transistor Q3 of termination of described audion Q1；One termination of described resistance R18 is described
Resistance R17 and the points of common connection of described field effect transistor Q3, other end ground connection；Described field effect transistor Q3
Source ground, the drain electrode of described field effect transistor Q3 connects described first LED group.
Second drives module 105 to include resistance R19, resistance R20, resistance R21, audion Q2 and field effect
Should pipe Q4.
The base stage of described audion Q2 connects described reverse comparison module 103, the emitter stage of described audion Q2
Ground connection, the colelctor electrode of described audion Q2 meets described resistance R19 and described resistance R20；Described resistance R19
Away from a termination input voltage of described audion Q2, described resistance R20 is away from the one of described audion Q2
Terminate the grid of described field effect transistor Q4；The one described resistance R20 of termination of described resistance R21 and described field
The points of common connection of effect pipe Q4, other end ground connection；The source ground of described field effect transistor Q4, described field
The drain electrode of effect pipe Q4 connects described second LED group.
Based on above-mentioned all embodiments, the operation principle of the LED drive circuit of adjustable color temperature is as follows:
By the knob of the 0-10V voltage regulator that regulation is connected on input interface J4,0-10V electricity can be made
Pressure actuator current potential on described input interface J4 produces change.It is then output to PWM control module 102.
Based in the oscillation module 101 of comparator U1A, when being initially powered, VCC passes through resistance R3, electricity
Resistance R4 charges to electric capacity C1.The voltage i.e. VB at electric capacity C1 two ends, its initial value is 0, comparator U1A
The voltage i.e. VA of in-phase input end, therefore, VA > VB, comparator U1A output voltage initial value is high
Level VH.Along with the power supply lasting charging to electric capacity C1, VB constantly raises, as VB > VA time, compare
Device U1A overturns, and comparator U1A output voltage is become low level VL from high level VH.Now due to two
The existence of pole pipe D1, electric capacity C1 stops charging and proceeds to discharge process, and by resistance R3, diode D1
And comparator U1A output pin internal circuit discharges.Along with the electric discharge of electric capacity C1, VB constantly declines,
As VB, < during VA, comparator U1A overturns again, and comparator U1A output voltage is become from low level VL
High level VH.So, electric capacity C1 just completes a complete charge and discharge cycles, circulates according to this simultaneously
Process constantly carries out discharge and recharge, thus forms vibration triangular wave waveform at electric capacity C1 two ends.
When vibration triangular wave produce after, as the input signal of comparator U1B end of oppisite phase, and with its in-phase end
Compare output, produce pwm signal at resistance R11 end.The voltage signal of 0-10V is followed by by dividing potential drop
Enter the in-phase end of comparator U1B, control the dutycycle of pwm signal with this.
Pwm signal one tunnel is used for controlling the on off state of field effect transistor Q3, and a road is connected to comparator U2A
The reverse comparison module 103 of composition.When the pwm signal of input is high level, comparator U2A's is anti-
Phase input terminal voltage is more than in-phase input end voltage, is output as low level；When the pwm signal of input is low electricity
At ordinary times, the anti-phase input terminal voltage of comparator U2A is less than in-phase input end voltage, is output as high level, from
And obtain another road pwm signal complementary with input pwm signal, it is used for controlling opening of field effect transistor Q4
Off status.Field effect transistor Q3 and field effect transistor Q4 are respectively connecting to J2 and J3, and J2 and J3 is respectively connected to
The LED lamp bead of two groups of different-colours, when pwm signal dutycycle changes, the brightness of LED lamp bead
Changing therewith, colour temperature also can occur to change accordingly.
Diode D3 is anti-circnit NOT, prevents LED constant current from driving the LED that power input interface J1 accesses
Constant-current driving power supply both positive and negative polarity connects and counter causes circuit to damage.
Electric capacity C7, resistance R22, stabilivolt D4, NPN audion Q5, electric capacity C4 form Voltage stabilizing module
106, voltage stabilization that power input interface J1 inputs will be driven at 12V from LED constant current.
Resistance R15, resistance R16, resistance R17, resistance R18, NPN audion Q1 is the first driving mould
Block 104, the pwm signal exported by comparator U1B amplifies, and strengthens the driving force of field effect transistor Q3.
Resistance R14, resistance R19, resistance R20, resistance R21, NPN audion Q2 is the second driving mould
Block 105, the pwm signal exported by comparator U2A amplifies, and strengthens the driving force of field effect transistor Q4.
In the present embodiment, the colour temperature of the first LED group being connected with described lamp group interface J1 is 6000k.
The colour temperature of the second LED group being connected with described lamp group lamp group interface J3 is 3000k, at a described LED
When the luminosity of lamp group and described second LED group changes, the mixed light of two groups of LED groups, adjustable color
Whole arbitrary value between 3000k～6000K.
The LED drive circuit of above-mentioned adjustable color temperature generates vibration triangular wave by described oscillation module 101, then
The dutycycle of the pwm signal exported according to vibration triangular wave regulation by described PWM control module 102.Institute
State the first driving module 104 and after described reverse comparison module 103 receives pwm signal, described reversely compare
Module 103 carries out reverse process to it, and the pwm signal after processing exports and drives module 105 to second.
I.e. first drives module 104 and the complementary duty cycle of the second pwm signal driving module 105 to receive.Therefore,
Respectively by described first driving module 104 and the described second described first LED driving module 105 to control
The luminosity power of group and described second LED group is complementary, thus changes the duty of input pwm signal
Described first LED group and the luminosity of described second LED group than regulating, and then change described
First LED group and the colour temperature of described second LED group.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed,
But therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that, for this area
Those of ordinary skill for, without departing from the inventive concept of the premise, it is also possible to make some deformation and
Improving, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be with appended
Claim is as the criterion.
Claims (10)
1. a LED drive circuit for adjustable color temperature, for the colour temperature of LED group is adjusted, its
It is characterised by, including oscillation module, PWM control module, reverse comparison module, first drives module and the
Two drive module；
Described oscillation module is used for generating vibration triangular wave and exports to described PWM control module；Described PWM
Control module is for the dutycycle of the pwm signal according to the regulation output of described vibration triangular wave；Described first drives
Dynamic model block and described reverse comparison module are used to receive the pwm signal of described PWM control module output；
Described reverse comparison module, for described pwm signal is carried out reverse process, makes this PWM after process believe
Number with the complementary duty cycle of pwm signal of described PWM control module output, the PWM letter after processing
Number output to second drive module；Described first drives module for controlling and it according to the pwm signal received
The luminosity of the first LED group connected；Described second drives module for according to the PWM letter received
Number control connected second LED group luminosity.
The LED drive circuit of adjustable color temperature the most according to claim 1, it is characterised in that also include
Voltage stabilizing module, described Voltage stabilizing module is used for stabilized input voltage at load voltage value and by described rated voltage
Value output to described oscillation module, described PWM control module, described reverse comparison module, described first drive
Dynamic model block and described second drives module.
The LED drive circuit of adjustable color temperature the most according to claim 2, it is characterised in that described surely
Die block include diode D3, electrochemical capacitor C7, electrochemical capacitor C4, audion Q5, stabilivolt D4 and
Resistance R22；
The positive pole of described diode D3 connects described input voltage, negative pole connects described first LED group and described
Second LED group；The positive pole of described electrochemical capacitor C7 connects the negative pole of described diode D3, minus earth；
The plus earth of described stabilivolt D4, negative pole connect the base stage of described audion Q5；Described audion Q5's
Emitter stage connects the positive pole of described electrochemical capacitor C4, colelctor electrode connects the negative pole of described diode D3；Described electrolysis
The minus earth of electric capacity C4；Described resistance R22 is electrically connected the positive pole of described electrochemical capacitor C7 and described
The negative pole of stabilivolt D4.
The LED drive circuit of adjustable color temperature the most according to claim 1, it is characterised in that also include
For regulating the VRM Voltage Regulator Module of input voltage size, the output termination of described VRM Voltage Regulator Module is described
The input of PWM control module.
The LED drive circuit of adjustable color temperature the most according to claim 4, it is characterised in that described electricity
Pressure adjustment module includes that voltage regulator, described voltage regulator are used for regulating input voltage size, and by defeated
Enter voltage to export to described PWM control module.
The LED drive circuit of adjustable color temperature the most according to claim 1, it is characterised in that described in shake
Swing module and include resistance R1, resistance R2, resistance R3, resistance R4, resistance R13, diode D1, electricity
Hold C1 and comparator U1A；
Described resistance R1, described resistance R2 are series between input voltage and ground connection；Described resistance R4, institute
State resistance R3, described electric capacity C1 is sequentially connected in series between input voltage and ground connection；Described diode D1 is just
Pole connects described resistance R4 and the points of common connection of described resistance R3, negative pole and connects the output of described comparator U1A
End；Described resistance R13 connects the negative pole of described diode D1 and the homophase input of described comparator U1A respectively
End；The in-phase input end of described comparator U1A connects the points of common connection of described resistance R1 and described resistance R2；
The anti-phase input of described comparator U1A terminates the points of common connection of described resistance R3 and described electric capacity C1, institute
The inverting input stating comparator U1A is additionally operable to connect described PWM control module.
The LED drive circuit of adjustable color temperature the most according to claim 1, it is characterised in that described
PWM control module includes resistance R5, resistance R6, resistance R23, electric capacity C2, resistance R10, stabilivolt
D2 and comparator U1B；
Described resistance R5, described resistance R23 are sequentially connected in series in the homophase of input voltage Yu described comparator U1B
Between input；Described resistance R6 mono-terminates the points of common connection of described resistance R5 and described resistance R23,
Other end ground connection；The in-phase input end of the one described comparator U1B of termination of described electric capacity C2, another termination
Ground；Another termination of output the termination described resistance R10, described resistance R10 of described comparator U1B is described
The negative pole of stabilivolt D2, the positive pole of described stabilivolt D2 connects described first and drives module and described reversely compare
Module.
The LED drive circuit of adjustable color temperature the most according to claim 1, it is characterised in that described instead
Resistance R7, resistance R8, resistance R9, comparator U2A, resistance R12 and resistance is included to comparison module
R14；
The inverting input of the one described comparator U2A of termination of described resistance R8, another terminates described PWM
The outfan of control module；The one termination input voltage of described resistance R7, another terminates described comparator U2A
In-phase input end；The in-phase input end of the one described comparator U2A of termination of described resistance R9, the other end
Ground connection；Described resistance R12 mono-terminates the outfan of described comparator U2A, other end ground connection；Described resistance
The outfan of the one described comparator U2A of termination of R14, another termination described second drives module.
The LED drive circuit of adjustable color temperature the most according to claim 1, it is characterised in that described
One drives module to include resistance R11, resistance R15, resistance R16, resistance R17, resistance R18, audion
Q1 and field effect transistor Q3；
Described resistance R11 one end is connected with described resistance R15, and described resistance R11 is away from described resistance R15
One end ground connection；Described resistance R15 is away from the base stage of the described audion Q1 of termination of described resistance R11；
The points of common connection of described resistance R11 and described resistance R15 connects described PWM control module；Described three poles
The grounded emitter of pipe Q1, the colelctor electrode of described audion Q1 meets described resistance R16 and described resistance R17；
Described resistance R16 is away from a termination input voltage of described audion Q1, and described resistance R17 is away from described
The grid of one described field effect transistor Q3 of termination of audion Q1；The one described resistance of termination of described resistance R18
R17 and the points of common connection of described field effect transistor Q3, other end ground connection；The source electrode of described field effect transistor Q3
Ground connection, the drain electrode of described field effect transistor Q3 connects described first LED group.
The LED drive circuit of adjustable color temperature the most according to claim 1, it is characterised in that described
Second drives module to include resistance R19, resistance R20 resistance R21, audion Q2 and field effect transistor Q4；
The base stage of described audion Q2 connects described reverse comparison module, the grounded emitter of described audion Q2,
The colelctor electrode of described audion Q2 meets described resistance R19 and described resistance R20；Described resistance R19 away from
The one termination input voltage of described audion Q2, described resistance R20 is away from a termination of described audion Q2
The grid of described field effect transistor Q4；The one described resistance R20 of termination of described resistance R21 and described field effect
The points of common connection of pipe Q4, other end ground connection；The source ground of described field effect transistor Q4, described field effect
The drain electrode of pipe Q4 connects described second LED group.
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| CN201510293642.XA CN106304525A (en) | 2015-06-01 | 2015-06-01 | The LED drive circuit of adjustable color temperature |
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| CN201510293642.XA CN106304525A (en) | 2015-06-01 | 2015-06-01 | The LED drive circuit of adjustable color temperature |
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| CN106304525A true CN106304525A (en) | 2017-01-04 |
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| CN201510293642.XA Pending CN106304525A (en) | 2015-06-01 | 2015-06-01 | The LED drive circuit of adjustable color temperature |
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| CN108449824A (en) * | 2017-02-16 | 2018-08-24 | 朗德万斯公司 | LED module and method for operating LED module |
| CN109475028A (en) * | 2018-12-15 | 2019-03-15 | 深圳和而泰智能照明有限公司 | A kind of lighting device |
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