CN206380128U - A kind of LED light modulations toning constant-temperature circuit - Google Patents
A kind of LED light modulations toning constant-temperature circuit Download PDFInfo
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- CN206380128U CN206380128U CN201621433318.XU CN201621433318U CN206380128U CN 206380128 U CN206380128 U CN 206380128U CN 201621433318 U CN201621433318 U CN 201621433318U CN 206380128 U CN206380128 U CN 206380128U
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Abstract
The utility model discloses a kind of LED light modulation toning constant-temperature circuits, including resistance R1, R2, R3, R4, R5, R6, RES1, electric capacity C1, C2, C3, metal-oxide-semiconductor Q1, Q2, Q3, Q4, potentiometer VR1, diode D1, amplifier module U1, cool white LED modules, warm white LED modules；The amplifier module connects resistance R1, resistance R2, resistance R6, electric capacity C1, electric capacity C2, electric capacity C3, power supply VCC respectively.Circuit of the present utility model improves the defect of current LED light modulations toning thermostatic power, and the circuit of the DC DC chips composition handled than two-way constant current, pin enabled with PWM is simpler, and practicality is stronger；Break through the power output upper limit of the LED light modulation toning single power supplys of thermostatic power, it is adaptable to tens watts to several kilowatts of LED power.
Description
Technical field
The utility model is related to LED power, and in particular to a kind of novel large-power LED power supply light modulation toning constant temperature invariable power
Circuit.
Background technology
At present, LED power PWM dimming modes are to drive switch mosfet by pwm signal, as shown in Figure 2, by adjusting
Save the dutycycle of switch mosfet to change the peak point current of LED power output, so as to change LED brightness；LED power is mixed colours
Temperature is to reach the purpose for changing colour temperature by adjusting the brightness ratio for two groups of LED that LED power is loaded；PWM light modulations are regulations
LED opening time realizes light modulation, and because there is the presence of sunset glow effect, causes human eye None- identified to go out the closing of LED
State；Because PWM light modulations are the LED changed by pwm control signal opening times, LED brightness and PWM control to believe
Number direct proportionality.
The technological deficiency of presence is：Possess the LED power of constant pressure and two kinds of output states of constant current at present, and constant-voltage LED is adjusted
The major defect of light toning thermostatic power is because a part of power, institute can be lost by being used for constant current shunt resistance in LED modules
To be less than constant-current supply using the overall light efficiency of LED during constant voltage source；And constant current LED power supplies are adjusted with PWM dimming modes
Also there is a point defect during photoelectric source：Because power supply itself is that input, the limit of power output are realized by adjusting unlatching dutycycle
It is fixed, so power output end will also be operated on off state；Again because the output current of constant-current supply is constant so that power supply
The peak point current of output is limited (peak point current is more than average current), so when PWM is dimmed because peak inrush current is limited
Determine and cause the power output of power supply can not be with pwm control signal direct proportionality；Therefore there is pwm control signal ability 70%-
When 80% the output current of power supply be 100%, pwm control signal output current of power supply in 80%-95% be 100% and
Power input power has been the 110% of normal input power, only pwm control signal dutycycle close to 100% power supply
Recover normal (peak point current is equal with average current during dutycycle 100%)；Constant current LED power supplies are adjusted with PWM dimming modes
It is also defective during colour temperature power supply：Equally because the output peak point current of constant-current supply is defined, work as PWM1, PWM2 unlatching
Dutycycle respectively be 50% when, constant current LED power supplies output total current be not 50% plus 50% be equal to 100%, but only
50%.Therefore there are two groups of LED modules while output power of power supply actually only has the defect of half when lighting.
The content of the invention
The utility model in view of the above-mentioned problems, a kind of LED light modulation toning constant-temperature circuit, including resistance R1, R2, R3, R4,
R5, R6, RES1, electric capacity C1, C2, C3, metal-oxide-semiconductor Q1, Q2, Q3, Q4, potentiometer VR1, diode D1, amplifier module U1, cool white
LED modules, warm white LED modules；The amplifier module connects resistance R1, resistance R2, resistance R6, electric capacity C1, electric capacity C2, electricity respectively
Hold C3, the connection of power supply VCC, 2.5V power supply potentiometer VR1, the potentiometer VR1 and connect resistance R4, resistance R5, the electricity respectively
Resistance R4, R5 connect metal-oxide-semiconductor Q3, Q4 drain electrode respectively；The electric capacity C3 connection resistance R6；Described resistance R3 one end connects resistance
R6, the other end connects metal-oxide-semiconductor Q1, Q2 source electrode, resistance RES1 respectively；PWM1 signals connect metal-oxide-semiconductor Q3, Q1 grid respectively；Institute
State metal-oxide-semiconductor Q1 drain electrode connection cool white LED modules；PWM2 signals connect metal-oxide-semiconductor Q2, Q4 grid respectively；The metal-oxide-semiconductor Q2 drain electrodes connect
Connect warm white LED modules；Feedback end FB passes through diode D1 connection electric capacity C3.
Further, the resistance R1 resistances are 5.1K.
Further, resistance R4, R5 resistance is 15K.
Further, described electric capacity C1, C2 are 100NF electric capacity.
Further, the electric capacity C3 is 470NF electric capacity.
Advantage of the present utility model：
Circuit of the present utility model improves the defect of current LED light modulations toning thermostatic power, than two-way constant current processing, band
The circuit that PWM enables the DC-DC chips composition of pin is simpler, and practicality is stronger；Break through the LED light modulation toning single electricity of thermostatic power
The power output upper limit in source, it is adaptable to tens watts to several kilowatts of LED power.
In addition to objects, features and advantages described above, the utility model also has other purposes, feature and excellent
Point.Below with reference to figure, the utility model is described in further detail.
Brief description of the drawings
The accompanying drawing for constituting the part of the application is used for providing further understanding to of the present utility model, of the present utility model
Schematic description and description is used to explain the utility model, does not constitute to improper restriction of the present utility model.
Fig. 1 is a kind of LED light modulation toning constant-temperature circuit schematic diagrams of the utility model embodiment；
Fig. 2 is that existing LED dims toning constant-temperature circuit schematic diagram at present.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to explain this
Utility model, is not used to limit the utility model.
With reference to a kind of Fig. 1 LED light modulation toning constant-temperature circuits as shown in Figure 1, including resistance R1, R2, R3, R4, R5, R6,
RES1, electric capacity C1, C2, C3, metal-oxide-semiconductor Q1, Q2, Q3, Q4, potentiometer VR1, diode D1, amplifier module U1, cool white LED modules,
Warm white LED modules；The amplifier module connects resistance R1, resistance R2, resistance R6, electric capacity C1, electric capacity C2, electric capacity C3, electricity respectively
The connection of source VCC, 2.5V power supply potentiometer VR1, the potentiometer VR1 connect resistance R4, resistance R5, described resistance R4, R5 respectively
Connection metal-oxide-semiconductor Q3, Q4 drain electrode respectively；The electric capacity C3 connection resistance R6；Described resistance R3 one end connects resistance R6, the other end
Metal-oxide-semiconductor Q1, Q2 source electrode, resistance RES1 are connected respectively；PWM1 signals connect metal-oxide-semiconductor Q3, Q1 grid respectively；The metal-oxide-semiconductor Q1
Drain electrode connection cool white LED modules；PWM2 signals connect metal-oxide-semiconductor Q2, Q4 grid respectively；The metal-oxide-semiconductor Q2 drain electrodes connection warm white LED
Module；Feedback end FB passes through diode D1 connection electric capacity C3.
The resistance R1 resistances are 5.1K.
Resistance R4, R5 resistance is 15K.
Described electric capacity C1, C2 are 100NF electric capacity.
The electric capacity C3 is 470NF electric capacity.
The resistance R2 is divider resistance.
The resistance RES1 is sampling resistor
Amplifier module therein is AP4310.
The operation principle of the utility model circuit：
Sampled voltage is adjusted using electric resistance partial pressure principle so that power supply output average current changes, because the average electricity of regulation
Stream changes the dutycycle needs 100% (switch mosfet has time loss) that LED luminance opens LED, so peak point current
Also it is approximately equal to average current so that pwm control signal is similar to proportional relationship with LED luminance.
Utilize Q3, the size of current regulation sampled voltage of Q4 outputs, because the power supply on Q3, Q4 current loop is small-power
Constant voltage source, so work as PWM1, when PWM2 unlatching dutycycle is respectively 50%, Q3, the electric currents of Q4 outputs is close to 100%
(switch mosfet has time loss)；Therefore two groups of LED modules can be improved while the defect that output power of power supply declines when opening.
Diode D1 has been buffer action, because AP4310 is the double operational control core that constant voltage shares feedback point with constant current
Piece, so the amplifier that constant pressure is will act as with diode is isolated with the amplifier as constant current, it is to avoid constant current function and pressure-keeping functions
It can not coexist simultaneously.
Circuit of the present utility model improves the defect of current LED light modulations toning thermostatic power, than two-way constant current processing, band
The circuit that PWM enables the DC-DC chips composition of pin is simpler, and practicality is stronger；Break through the LED light modulation toning single electricity of thermostatic power
The power output upper limit in source, it is adaptable to tens watts to several kilowatts of LED power.
Preferred embodiment of the present utility model is the foregoing is only, it is all in this practicality not to limit the utility model
Within new spirit and principle, any modification, equivalent substitution and improvements made etc. should be included in guarantor of the present utility model
Within the scope of shield.
Claims (5)
1. a kind of LED light modulations toning constant-temperature circuit, it is characterised in that including resistance R1, R2, R3R4, R5, R6, RES1, electric capacity
C1, C2, C3, metal-oxide-semiconductor Q1, Q2, Q3, Q4, potentiometer VR1, diode D1, amplifier module U1, cool white LED modules, warm white LED moulds
Group；The amplifier module connects resistance R1, resistance R2, resistance R6, electric capacity C1, electric capacity C2, electric capacity C3, power supply VCC, 2.5V respectively
Power supply connection potentiometer VR1, the potentiometer VR1 connect resistance R4, resistance R5, described resistance R4, R5 and connect MOS respectively respectively
Pipe Q3, Q4 drain electrode；The electric capacity C3 connection resistance R6；Described resistance R3 one end connects resistance R6, and the other end connects MOS respectively
Pipe Q1, Q2 source electrode, resistance RES1；PWM1 signals connect metal-oxide-semiconductor Q3, Q1 grid respectively；The metal-oxide-semiconductor Q1 drain electrodes connection cool white
LED modules；PWM2 signals connect metal-oxide-semiconductor Q2, Q4 grid respectively；The metal-oxide-semiconductor Q2 drain electrodes connection warm white LED modules；Feedback end
FB passes through diode D1 connection electric capacity C3.
2. LED light modulations toning constant-temperature circuit according to claim 1, it is characterised in that institute's resistance R1 resistances are 5.1K.
3. LED according to claim 1 light modulation toning constant-temperature circuit, it is characterised in that institute's resistance R4, R5 resistance is
15K。
4. LED light modulations toning constant-temperature circuit according to claim 1, it is characterised in that institute electric capacity C1, C2 are 100NF
Electric capacity.
5. LED light modulations toning constant-temperature circuit according to claim 1, it is characterised in that institute electric capacity C3 is 470NF electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621433318.XU CN206380128U (en) | 2016-12-26 | 2016-12-26 | A kind of LED light modulations toning constant-temperature circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621433318.XU CN206380128U (en) | 2016-12-26 | 2016-12-26 | A kind of LED light modulations toning constant-temperature circuit |
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| Publication Number | Publication Date |
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| CN206380128U true CN206380128U (en) | 2017-08-04 |
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| CN201621433318.XU Active CN206380128U (en) | 2016-12-26 | 2016-12-26 | A kind of LED light modulations toning constant-temperature circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107911902A (en) * | 2017-11-30 | 2018-04-13 | 广东新昇电业科技股份有限公司 | A kind of doubleway output switch toning circuit temperature |
-
2016
- 2016-12-26 CN CN201621433318.XU patent/CN206380128U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107911902A (en) * | 2017-11-30 | 2018-04-13 | 广东新昇电业科技股份有限公司 | A kind of doubleway output switch toning circuit temperature |
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