CN106937445B - A kind of switch multistage linear constant-current dimming LED light - Google Patents
A kind of switch multistage linear constant-current dimming LED light Download PDFInfo
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- CN106937445B CN106937445B CN201710199711.XA CN201710199711A CN106937445B CN 106937445 B CN106937445 B CN 106937445B CN 201710199711 A CN201710199711 A CN 201710199711A CN 106937445 B CN106937445 B CN 106937445B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
Abstract
The invention discloses a kind of switch multistage linear constant-current dimming LED light,Including AC to DC converter circuit,Switch multistage linear control circuit,First LED illuminating circuits and the 2nd LED illuminating circuits,The colour temperature of first LED illuminating circuits is less than the colour temperature of the 2nd LED illuminating circuits,Switching multistage linear control circuit has input terminal,First output terminal and second output terminal,First LED illuminating circuits and the 2nd LED illuminating circuits are respectively provided with positive input terminal and negative input end,Input terminal of the output terminal of AC to DC converter circuit respectively with the positive input terminal of the first LED illuminating circuits and switch multistage linear control circuit is connect,The negative input end of first LED illuminating circuits,The positive input terminal of 2nd LED illuminating circuits is connected with the first output terminal of switch multistage linear control circuit,The negative input end of 2nd LED illuminating circuits is connected with the second output terminal of switch multistage linear control circuit；Advantage is while light emission luminance is adjusted, and can adjust luminescent color.
Description
Technical field
The present invention relates to a kind of LED light, more particularly, to a kind of switch multistage linear constant-current dimming LED light.
Background technology
Currently, LED has been widely used in lighting area, and each production firm pushes away while cost performance is continuously improved
Go out the LED light of functional diversities.It switchs multistage linear constant-current dimming LED light and multistage linear control circuit is switched by setting, open
The break-make number of power switch in multistage linear control circuit acquisition alternating current is closed to adjust the light emission luminance of LED light or luminous face
Color realizes the multistage brightness adjustment control to LED light, and easy-to-connect is at low cost, has gradually substituted traditional Switching Power Supply constant current tune
Light LED light, is widely used.It is existing to switch multistage linear constant current light-adjustable LED lamp or shining for LED light be adjusted
Brightness, it is impossible to adjust luminescent color or the luminescent color of LED light can only be adjusted, it is impossible to adjust light emission luminance.At present, it switchs
Multistage linear constant current light-adjustable LED lamp can be divided into two classes according to its performance：Brightness regulation type switchs multistage linear constant current tunable optical
LED light and color adaptation type switch multistage linear constant current light-adjustable LED lamp.
The structure principle chart of brightness regulation type switch multistage linear constant current light-adjustable LED lamp is as shown in Figure 1, the LED light packet
Include AC to DC converter circuit, switch multistage linear control circuit and LED illuminating circuits.AC to DC converter circuit is accessed with firewire
End, zero curve incoming end and output terminal, switch multistage linear control circuit have input terminal, the first output terminal and second output terminal,
LED illuminating circuits have positive input terminal and negative input end, and the firewire incoming end AC-L of AC to DC converter circuit connects the firewire of alternating current,
Zero curve incoming end AC-N connects the zero curve of alternating current, the output terminal of AC to DC converter circuit, the positive input terminal and switch of LED illuminating circuits
The input terminal connection of multistage linear control circuit, the negative input end of LED illuminating circuits is respectively with switching multistage linear control circuit
The first output terminal connected with second output terminal.In the LED light, switch multistage linear control circuit control flows through LED and shines electricity
Thus the size of current on road changes the light emission luminance of LED light.Brightness regulation type switch multistage linear constant current light-adjustable LED lamp
Circuit is as shown in Figure 2.In Fig. 2, SM2213EA chips, three resistance (R1, R2 and R3) and two capacitances (C1 and C2) are formed
Multistage linear control circuit is switched, SM2213EA chips are switch multistage linear control integrated circuits general at present, as the LED
Lamp is connected to alternating current, when the power switch of alternating current carries out switch motion to the LED light, switchs the input of multistage linear control circuit
Termination receives the signal of on-off times, and the switching of switching signal makes the 6th foot of SM2213EA chips (switch multistage linear control electricity
The first output terminal Out1 on road) and the 5th foot second output terminal Out2 of multistage linear control circuit (switch) conducting state and
Size of current changes, and for the LED illuminating circuits of fixed voltage, the brightness of LED light and flows through LED illuminating circuits
Size of current is directly proportional, so the size for adjusting LED light-emitting circuit currents can adjust the brightness of LED light.When power switch connects
During continuous action, the state change of LED light, specific change procedure is：It is first state when power switch is opened for the first time,
The 5th foot conducting of SM2213EA chips, the 6th foot disconnect, and pair that a size is Vcf is provided in the 4th foot of SM2213EA chips
Ground reference voltage, for setting the electric current of the 5th foot, the size of current for flowing through LED illuminating circuits is I1=Vcf/R2；Switch first
It is the second state, the 6th foot of SM2213EA chips and the 5th foot simultaneously turn on, in SM2213EA chips when being opened again after secondary shutdown
3rd foot and the 4th foot provide the reference voltage over the ground that size is 0.5*Vcf respectively, due to the voltage-to-ground phase of the 3rd foot and the 4th foot
Together, although the 6th foot conducting of SM2213EA chips, the electric current being actually turned on is zero, (0.5*Vcf-0.5*Vcf)/R3=0,
The electric current of the 5th foot output of SM2213EA chips is 0.5*Vcf/R2 at this time, so the total current for flowing through LED illuminating circuits is I2
=0.5*Vcf/R2, during this state, the electric current of LED illuminating circuits only has the half of first state, so the LED light of the second state
Brightness be first state a half intensity；It is the third state when switch second is opened again after turning off, the of SM2213EA chips
6 feet are connected, and the 5th foot disconnects, and reference voltage is Vcf to the 3rd foot of the 6th foot size of current of setting SM2213EA chips over the ground, that
The electric current for flowing through the 6th foot of SM2213EA chips is I3=Vcf/ (R3+R2), can be set by the resistance value for changing resistance R3
This fixed state flows through the size of current of LED illuminating circuits, and under normal circumstances, the resistance value of resistance R3 is much larger than resistance R2, so
The electric current of the I3 of this state is much smaller than I1, and the brightness of third state LED light can be made to be much smaller than the brightness of first state in this way；When
When power switch is carried out continuously switch, the 5th foot of SM2213EA chips and the state of the 6th foot can circulation change successively, LED light
Brightness also will circulation change successively, be achieved in the brightness regulation of LED light.
The structure principle chart of color adaptation type switch multistage linear constant current light-adjustable LED lamp is as shown in figure 3, the LED light packet
AC to DC converter circuit, switch multistage linear control circuit and two paths of LED illuminating circuit, two paths of LED illuminating circuit is included respectively to remember
For the first LED illuminating circuits and the 2nd LED illuminating circuits, the colour temperature of the first LED illuminating circuits is less than the 2nd LED illuminating circuits
Colour temperature flows through the current ratio of the first LED illuminating circuits and the 2nd LED illuminating circuits by control, thus it is possible to vary the face of LED light
Color.AC to DC converter circuit has firewire incoming end, zero curve incoming end and output terminal；Multistage linear control circuit is switched with defeated
Enter end, the first output terminal and second output terminal, the first LED illuminating circuits and the 2nd LED illuminating circuits and be respectively provided with positive input terminal
And negative input end, the firewire incoming end AC-L of AC to DC converter circuit connect the firewire of alternating current, zero curve incoming end AC-N connects alternating current
Zero curve, the output terminal of AC to DC converter circuit respectively with the positive output end of the first LED illuminating circuits, the 2nd LED illuminating circuits
Positive input terminal is connected with the input terminal of switch multistage linear control circuit, and the negative input end and switch of the first LED illuminating circuits are more
The first output terminal connection of section linearity control circuit, negative input end and the switch multistage control circuit of the 2nd LED illuminating circuits
Second output terminal connects.The circuit of color adaptation type switch multistage linear constant current light-adjustable LED lamp is as shown in Figure 4.In Fig. 4,
SM2213EA chips, three resistance (R1, R2 and R3) and two capacitances (C1 and C2) form switch multistage linear control circuit,
SM2213EA chips are switch multistage linear control integrated circuits general at present, and resistance R3 is used to set SM2213EA chips
Electric current when 6th foot is connected, size of current when resistance R2 is used to that the 5th foot of SM2213EA chips to be set to be connected.General resistance
R3 and resistance R2 takes identical resistance value R.5th foot of SM2213EA chips is defeated as switch multistage linear control circuit second
Outlet, first output terminal of the 6th foot as switch multistage linear control circuit, after the 8th foot connecting resistance R1, as switch multi-section-line
The input terminal of property control circuit.When the LED light is connected on alternating current, when the power switch of alternating current carries out switch motion to LED light, open
The input terminal for closing multistage linear control circuit receives the signal of on-off times, and each switch signal controls switch multistage linear
First output terminal of circuit and the conducting state and size of current of second output terminal change.Brightness and stream due to LED light
The size of current for crossing two paths of LED illuminating circuit is directly proportional, adjusts the size of current of two paths of LED illuminating circuit and can adjust two-way
The light emission luminance of LED illuminating circuits, and the ratio of the brightness of two LED illuminating circuits is different, the color that LED light is shown is just not
Together.When power switch acts, the LED light state change, particular state process is：It is first when power switch is opened for the first time
State, the 5th foot conducting of SM2213EA chips, the 6th foot disconnect, and provide a size in the 4th foot refers to electricity over the ground for Vcf
Pressure, the conducting electric current of the 5th foot of resistance R2 setting SM2213EA chips, size of current are:I1=Vcf/R2=Vcf/R, at this time
The color of LED light is the color that the 2nd LED illuminating circuits of high color temperature individually shine, and color is whiter；After switch turns off for the first time
It is the second state, the 5th foot of SM2213EA chips and the 6th foot are simultaneously turned on, provided respectively greatly in the 3rd foot and the 4th foot when opening again
The small reference voltage over the ground for 0.5*Vcf flows through the first output terminal and second output terminal of switch multistage linear control circuit
Size of current is respectively:I21=0.5*Vcf/R3=0.5*Vcf/R and I22=0.5*Vcf/R2=0.5*Vcf/R, so stream
The electric current for crossing the first LED illuminating circuits and the 2nd LED illuminating circuits is equal, and total current:I2=0.5*Vcf/R3+0.5*
Vcf/R2=Vcf/R, so, when the second state and first state, the total current for flowing through two paths of LED illuminating circuit is constant, still
During the second state, since the electric current of the first LED illuminating circuits of the 2nd LED illuminating circuits and low colour temperature of high color temperature is equal, two
Paths of LEDs illuminating circuit all shines, and the color of the LED light of this state is in color when two LED illuminating circuits individually shine
Between color；It is the third state when being opened again after second of shutdown of switch, the 6th foot of SM2213EA chips is connected, and the 5th foot disconnects, if
The reference voltage over the ground for putting the 3rd foot of the size of current of the 6th foot is Vcf, and the electric current for flowing through the 6th foot is:I3=Vcf/R3=
Vcf/R, the third state is equal with the total current of first state and the two paths of LED illuminating circuit of the second state, so LED light is bright
Degree does not change, but the first LED illuminating circuits that the third state only has low colour temperature shine, so the color of LED light is at this time
The color that first LED illuminating circuits are individually lighted, color are redder.When power switch is carried out continuously switch motion, multistage is switched
The state of the output terminal of linearity control circuit will circulation change successively, the color of LED light also will circulation change successively.The LED light
Two paths of LED illuminating circuit is used, under various states or a LED illuminating circuit full power shines, but another LED is sent out
Optical circuit do not work or two paths of LED illuminating circuit at the same shine, but by electric current all only have rated current half, do not have
One state can make two LED illuminating circuits can fullcharging work.So the utilization rate of the illuminating circuit of this type LED light compared with
It is low.
Above two LED light can only individually adjust light emission luminance or individually adjust luminescent color, can not meet bright in adjusting
The market demand of color is adjusted when spending simultaneously.In view of this, design one kind can be adjusted luminous while light emission luminance is adjusted
The switch multistage linear constant-current dimming LED light of color is of great significance.
Invention content
The technical problems to be solved by the invention are to provide one kind while light emission luminance is adjusted, and can adjust luminous face
The switch multistage linear constant-current dimming LED light of color.
Technical solution is used by the present invention solves above-mentioned technical problem：A kind of switch multistage linear constant-current dimming LED
Lamp shines including AC to DC converter circuit, switch multistage linear control circuit and two paths of LED illuminating circuit, the two paths of LED
Circuit is respectively the first LED illuminating circuits and the 2nd LED illuminating circuits, and the colour temperature of the first LED illuminating circuits is less than institute
The colour temperature of the 2nd LED illuminating circuits stated, the AC to DC converter circuit have firewire incoming end, zero curve incoming end and output
End, the switch multistage linear control circuit have input terminal, the first output terminal and second output terminal, the first LED
Illuminating circuit and the 2nd LED illuminating circuits are respectively provided with positive input terminal and negative input end, and the exchange turns direct current
The output terminal on road respectively with the positive input terminal of the first LED illuminating circuits and the switch multistage linear control circuit
Input terminal connect, the negative input end of the first LED illuminating circuits, the positive input terminal of the 2nd LED illuminating circuits and
The switch multistage linear control circuit the first output terminal connection, the negative input end of the 2nd LED illuminating circuits and
The second output terminal connection of the switch multistage linear control circuit.
The switch multistage linear control circuit includes SM2213EA chips, first resistor, second resistance, third electricity
Resistance, the 4th resistance, the 5th resistance, the first capacitance and the second capacitance；One end of the first resistor is the switch multistage
The input terminal of linearity control circuit, the other end of the first resistor are connected with the 8th foot of the SM2213EA chips, institute
The one end for the second resistance stated be the switch multistage linear control circuit the first output terminal, the second resistance it is another
One end is connected with the 6th foot of the SM2213EA chips, and the 5th foot of the SM2213EA chips is the switch multistage
The second output terminal of linearity control circuit, the 1st foot of the SM2213EA chips are connected with one end of first capacitance,
2nd foot of the SM2213EA chips is connected with one end of second capacitance, the 3rd foot of the SM2213EA chips
It is connected with one end of the 3rd resistor, the 4th foot of the SM2213EA chips and one end of the 4th resistance connect
Connect, the other end of the 3rd resistor, the 4th resistance the other end connected with one end of the 5th resistance, institute
The other end of the other end of the 5th resistance, the other end of first capacitance and second capacitance stated is grounded.
The ratio between described 3rd resistor, the 4th resistance and described resistance value of the 5th resistance are 3：1：1.
Compared with prior art, the advantage of the invention is that by by the output terminal of AC to DC converter circuit respectively with first
The positive input terminal of LED illuminating circuits is connected with the input terminal of switch multistage linear control circuit, and bearing for the first LED illuminating circuits is defeated
Enter end, the positive input terminal of the 2nd LED illuminating circuits is connected with the first output terminal of switch multistage linear control circuit, the 2nd LED
The negative input end of illuminating circuit is connected with the second output terminal of switch multistage linear control circuit, when AC to DC converter circuit is connected to
During alternating current, for the power switch of alternating current when opening first time, the input terminal of switch multistage linear control circuit receives switch letter
Number enter first state, at this time switch multistage linear control circuit second output terminal output current, switch multistage linear control
First output terminal of circuit disconnects, and the electric current for flowing through the first LED illuminating circuits and the 2nd LED illuminating circuits is equal to switch multistage
The electric current of the second output terminal output of linearity control circuit, when being then turned on after power switch turns off for the first time, switchs multi-section-line
Property control circuit input terminal receive switching signal, into the second state, switch multistage linear control circuit at this time first is defeated
Outlet and second output terminal export certain electric current, but switch the electric current of the second output terminal output of multistage linear control circuit
The half of electric current during for first state, the electric current for then flowing through the 2nd LED illuminating circuits are switch multistage linear control circuits
The electric current of second output terminal output, and the electric current for flowing through the first LED illuminating circuits is switch multistage linear control circuit first
Output terminal and the electric current summation of second output terminal output, so in the second state, the first LED illuminating circuits and the 2nd LED shine
The electric current of circuit changes, and the electric current of the first LED illuminating circuits is more than the electric current of the 2nd LED illuminating circuits.Work as power supply
When being then turned on after second of shutdown of switch, the input terminal of switch multistage linear control electric current receives switching signal and enters third shape
State, the second output terminal of switch multistage linear control circuit disconnect, the first output terminal output of switch multistage linear control circuit
Electric current, one times when size of current is the second state, the electric current for then flowing through the 2nd LED illuminating circuits is zero, the 2nd LED hairs
Optical circuit does not shine, and only the first LED illuminating circuits have electric current by shining.Continue switch motion, more than being repeated in
Three kinds of states.In the present invention, the light emission luminance of the first LED illuminating circuits and the 2nd LED illuminating circuits and the circuit size flowed through
It is directly proportional, and the luminescent color of LED light is related with the light emission luminance ratio of the first LED illuminating circuits and the 2nd LED illuminating circuits,
From there through size of current or the LED electricity that the first LED illuminating circuits and the 2nd LED illuminating circuits are flowed through when adjusting each state
The actual power consumption size on road can adjust luminescent color while light emission luminance is adjusted.
Description of the drawings
Fig. 1 is the structure principle chart that existing brightness regulation type switchs multistage linear constant current light-adjustable LED lamp；
Fig. 2 is the circuit diagram that existing brightness regulation type switchs multistage linear constant current light-adjustable LED lamp；
Fig. 3 is the structure principle chart that existing color adaptation type switchs multistage linear constant current light-adjustable LED lamp；
Fig. 4 is the circuit diagram that existing color adaptation type switchs multistage linear constant current light-adjustable LED lamp；
Fig. 5 is the structure principle chart of the switch multistage linear constant current light-adjustable LED lamp of the present invention；
Fig. 6 is the circuit diagram of the switch multistage linear constant current light-adjustable LED lamp of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with attached drawing embodiment.
Embodiment one：As shown in figure 5, it is a kind of switch multistage linear constant-current dimming LED light, including AC to DC converter circuit 1,
It is respectively the first LED illuminating circuits 3 to switch multistage linear control circuit 2 and two paths of LED illuminating circuit, two paths of LED illuminating circuit
With the 2nd LED illuminating circuits 4, the colour temperature of the first LED illuminating circuits 3 is less than the colour temperature of the 2nd LED illuminating circuits 4, and exchange turns straight
Current circuit 1 has firewire incoming end, zero curve incoming end and output terminal, and switch multistage linear control circuit 2 has input terminal, first
Output terminal and second output terminal, the first LED illuminating circuits 3 and the 2nd LED illuminating circuits 4 are respectively provided with positive input terminal and negative input
End, the output terminal of AC to DC converter circuit 1 control respectively with the positive input terminal of the first LED illuminating circuits 3 and switch multistage linear
The input terminal connection of circuit 2, the negative input end of the first LED illuminating circuits 3, the positive input terminal and switch of the 2nd LED illuminating circuits 4
The first output terminal connection of multistage linear control circuit 2, the negative input end of the 2nd LED illuminating circuits 4 and switch multistage linear control
The second output terminal connection of circuit 2 processed.
Embodiment two：As shown in figure 5, it is a kind of switch multistage linear constant-current dimming LED light, including AC to DC converter circuit 1,
It is respectively the first LED illuminating circuits 3 to switch multistage linear control circuit 2 and two paths of LED illuminating circuit, two paths of LED illuminating circuit
With the 2nd LED illuminating circuits 4, the colour temperature of the first LED illuminating circuits 3 is less than the colour temperature of the 2nd LED illuminating circuits 4, and exchange turns straight
Current circuit 1 has firewire incoming end, zero curve incoming end and output terminal, and switch multistage linear control circuit 2 has input terminal, first
Output terminal and second output terminal, the first LED illuminating circuits 3 and the 2nd LED illuminating circuits 4 are respectively provided with positive input terminal and negative input
End, the output terminal of AC to DC converter circuit 1 control respectively with the positive input terminal of the first LED illuminating circuits 3 and switch multistage linear
The input terminal connection of circuit 2, the negative input end of the first LED illuminating circuits 3, the positive input terminal and switch of the 2nd LED illuminating circuits 4
The first output terminal connection of multistage linear control circuit 2, the negative input end of the 2nd LED illuminating circuits 4 and switch multistage linear control
The second output terminal connection of circuit 2 processed.
As shown in fig. 6, in the present embodiment, switch multistage linear control circuit 2 includes SM2213EA chips U1, first resistor
R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the first capacitance C1 and the second capacitance C2；First electricity
One end of resistance R1 is the input terminal for switching multistage linear control circuit 2, the other end of first resistor R1 and SM2213EA chips U1
The connection of the 8th foot, one end of second resistance R2 be the first output terminal of switch multistage linear control circuit 2, second resistance R2's
The other end is connected with the 6th foot of SM2213EA chips U1, and the 5th foot of SM2213EA chips U1 is switch multistage linear control circuit
2 second output terminal, one end connection of the 1st foot and the first capacitance C1 of SM2213EA chips U1, the 2nd of SM2213EA chips U1 the
One end of foot and the second capacitance C2 connect, and the 3rd foot of SM2213EA chips U1 is connected with one end of 3rd resistor R3, SM2213EA
The connection of one end of the 4th foot of chip U1 and the 4th resistance R4, the other end of 3rd resistor R3, the other end of the 4th resistance R4 and the
One end connection of five resistance R5, the other end of the other end of the 5th resistance R5, the other end of the first capacitance C1 and the second capacitance C2
It is grounded.The ratio between resistance value of 3rd resistor R3, the 4th resistance R4 and the 5th resistance R5 is 3：1：1.
When the switch multistage linear constant-current dimming LED light of the present embodiment is connected on alternating current, the power switch of alternating current is to the LED light
When carrying out switch motion, the input terminal of switch multistage linear control circuit 2 receives the signal of on-off times, each switch signal
The first output terminal of switch multistage linear control circuit 2 and the conducting state and electric current of second output terminal is made to change.For
For the LED circuit of fixed voltage, due to LED light brightness and flow through LED circuit size of current it is directly proportional, adjust LED electricity
The size of stream can adjust the light emission luminance of LED circuit.The rated voltage of the first LED illuminating circuits 3 is set as V1, the 2nd LED
The rated voltage of illuminating circuit 4 is V2, and the first LED illuminating circuits 3 and the 2nd LED illuminating circuits 4 use identical voltage value V.
When power switch acts, LED light state change, particular state process is：
It is first state when power switch is opened for the first time, the 5th foot of SM2213EA chips U1 is connected, and the 6th foot disconnects,
The reference voltage over the ground that size is Vcf is provided in the 4th foot of M2213EA chips U1, the resistance sizes over the ground of the 4th foot can be set
The output current of the 5th foot of SM2213EA chips U1, at this point, the second output terminal Out2 of switch multistage linear control circuit 2
Size of current is：
I1=Vcf/ (R4+R5) --- --- --- --- -- (1)
Under normal conditions, take the first LED illuminating circuits 3 rated current and the 2nd LED illuminating circuits 4 it is equal, and adjust
Rated current of the size of current of this whole state I 1 for the first LED illuminating circuits 3 and the 2nd LED illuminating circuits 4.So at this
During state, rated power that the first LED illuminating circuits 3 and the 2nd LED illuminating circuits 4 all reach.Due to switching multistage linear control
First output terminal Out1 of circuit 2 processed is off, and is then flowed through the electric current I11 of the first LED illuminating circuits 3 and is flowed through the
The electric current I12 of two LED illuminating circuits 4 is I1, and
I11:I12=1：1---------------(2)
Total luminous power of LED circuit is
P1=(V1+V2) * I1=2V*Vcf/ (R4+R5) --- --- --- --- (3)
When being opened again after power switch turns off for the first time, for the second state, the 5th foot and the 6th of SM2213EA chips U1
Foot simultaneously turns on, and the reference voltage over the ground that size is 0.5*Vcf is each provided in the 3rd foot and the 4th foot, can be with from circuit theory
Analysis obtains, the electric current of the electric current I22 and the first output terminal Out1 of the second output terminal Out2 of switch multistage linear control circuit 2
The ratio of I21 sizes is R3:R4, i.e.,：
I21:I22=R4:R3
The total current for flowing through the first LED illuminating circuits 3 is I2=I21+I22.So have：
I2:I22=1+R4/R3------------ (4)
The total current for flowing through the first output terminal Out1 and second output terminal Out2 of switch multistage linear control circuit 2 is：
I2=0.5Vcf/ (R3//R4+R5) --- --- --- --- -- (5)
Wherein R3//R4 is R3 and R4 parallel resistance values.
The luminous general power of LED lamp circuit is at this time：
P2=V1*I2+V2*I22=V*I2+V*I2* (I22/I2)=V*I2+V*I2* (R3/ (R3+R4))
P2=V*I2* (1+R3/ (R3+R4)) --- --- --- --- --- -- (6)
When being opened again after second of shutdown of power switch, it is the third state, switchs the first of multistage linear control circuit 2
Output terminal Out1 is connected, and second output terminal Out2 is disconnected, and sets the ginseng over the ground of the 3rd foot of the size of current of the first output terminal Out1
Voltage is examined as Vcf, the electric current I3 for flowing through the first output terminal Out1 of switch multistage linear control circuit 2 is low colour temperature first
The electric current of LED illuminating circuits 3：
I3=Vcf/ (R3+R5) --- --- --- --- ----(7)
P3=V1*I3=V*Vcf/ (R3+R5) --- --- -- (8)
When power switch is carried out continuously switch, the state of output port will circulation change successively.
In the present embodiment, R3, the ratio between R4 and R5 resistance value sizes are 3：1：1, if R3=3R, R4=R, R5=R.
In first state, show that luminous power is by equation (3)：
P1=2V*Vcf/2R=V*Vcf/R---------- (9)
When first state can be calculated by equation (2), the power of the first LED illuminating circuits 3 and the 2nd LED illuminating circuits 4
Than：
P11:P12=1：1------------(10)
During this state, the luminescent color of LED light individually shines in the first LED illuminating circuits 3 and the 2nd LED illuminating circuits 4
The intermediate colors of color.
In the second state, obtained by equation (4)：
I2：(I2-2)=4：3
The ratio between power P 22 of 21 and the 2nd LED illuminating circuits 4 of power P that can be calculated the first LED illuminating circuits 3 is：
P21：P22=4：3
The luminous intensity of this first LED illuminating circuit 3 of state is more than the luminous intensity of the 2nd LED illuminating circuits 4, LED light
Color it is partially redder than first state.
It can be obtained by equation (5)：
I2=0.5Vcf/ (R3//R4+R5)=0.5*Vcf/ (0.75+1) R=2*Vcf/7R
It is obtained by equation (6)：
P2=V*Vcf/2R
Compare 1 and second state power P2 of first state power P, obtain：
P2=P1/2；
The luminous power of second state is the half of first state.
In the third state, obtained by equation (7) (8)：
I3=V*Vcf/4R
P3=V*Vcf/4=P1/4
Luminous power in the third state only has a quarter of first state, is the half of the second state.
In summary, the ratio between luminous general power of illuminating circuit during each state is：
P1:P2:P3=4:2:1
I.e. each state of LED light when light emission luminance ratio
The first LED illuminating circuits 3 of low colour temperature of each state and the power ratio of the 2nd LED illuminating circuits 4 of high color temperature are followed successively by：
First state is 1:1, the second state is 4:3, the third state 1：0
Ratio is bigger, and the color of LED light is more red.
Claims (2)
1. a kind of switch multistage linear constant-current dimming LED light, including AC to DC converter circuit, switch multistage linear control circuit and
Two paths of LED illuminating circuit, the two paths of LED illuminating circuit are respectively the first LED illuminating circuits and the 2nd LED illuminating circuits,
The colour temperature of the first LED illuminating circuits is less than the colour temperature of the 2nd LED illuminating circuits, and the exchange turns direct current
Road has firewire incoming end, zero curve incoming end and output terminal, and the switch multistage linear control circuit has input terminal, first
Output terminal and second output terminal, the first LED illuminating circuits and the 2nd LED illuminating circuits are respectively provided with positive input
End and negative input end, it is characterised in that the output terminal of the AC to DC converter circuit shines electricity with the first LED respectively
The positive input terminal on road is connected with the input terminal of the switch multistage linear control circuit, the first LED illuminating circuits
Negative input end, the positive input terminal of the 2nd LED illuminating circuits and the switch multistage linear control circuit it is first defeated
The second of outlet connection, the negative input end of the 2nd LED illuminating circuits and the switch multistage linear control circuit is defeated
Outlet connects；
The switch multistage linear control circuit includes SM2213EA chips, first resistor, second resistance, 3rd resistor, the
Four resistance, the 5th resistance, the first capacitance and the second capacitance；One end of the first resistor is the switch multistage linear control
The input terminal of circuit processed, the other end of the first resistor is connected with the 8th foot of the SM2213EA microarray biochips, described
Second resistance one end be the switch multistage linear control circuit the first output terminal, the second resistance it is another
End is connected with the 6th foot of the SM2213EA chips, and the 5th foot of the SM2213EA chips is the switch multi-section-line
The second output terminal of property control circuit, the 1st foot of the SM2213EA chips are connected with one end of first capacitance, institute
2nd foot of the SM2213EA chips stated is connected with one end of second capacitance, the 3rd foot of the SM2213EA chips and
One end connection of the 3rd resistor, the 4th foot of the SM2213EA chips are connected with one end of the 4th resistance,
The other end of the 3rd resistor, the 4th resistance the other end connected with one end of the 5th resistance, it is described
The other end of the 5th resistance, the other end of first capacitance and second capacitance the other end be grounded.
A kind of 2. switch multistage linear constant-current dimming LED light according to claim 1, it is characterised in that the third electricity
The ratio between resistance, the 4th resistance and described resistance value of the 5th resistance are 3：1：1.
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| CN201710199711.XA CN106937445B (en) | 2017-03-30 | 2017-03-30 | A kind of switch multistage linear constant-current dimming LED light |
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| CN108135055A (en) * | 2018-01-12 | 2018-06-08 | 厦门恩耐照明技术有限公司 | It is a kind of can unrestricted choice light-modulating mode linearity light adjusting toning circuit |
| CN110248441B (en) * | 2019-05-22 | 2021-04-20 | 鹰潭阳光照明有限公司 | Intelligent light-operated linear LED lamp circuit |
| CN110536511B (en) * | 2019-09-02 | 2021-06-11 | 鹰潭阳光照明有限公司 | Dimmable LED lamp circuit |
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| CN202634787U (en) * | 2012-04-28 | 2012-12-26 | 刘四清 | LED light fixture with sectional color-temperature adjustment |
| CN204795790U (en) * | 2015-07-22 | 2015-11-18 | 江门市科隆达半导体照明有限公司 | LED constant -current drive circuit of luminance / colour temperature is adjusted in segmentation |
| CN106195659A (en) * | 2016-07-27 | 2016-12-07 | 佛山市国星光电股份有限公司 | A kind of COB light source and integration module and light fixture |
| CN206698471U (en) * | 2017-03-30 | 2017-12-01 | 新和（绍兴）绿色照明有限公司 | One kind switch multistage linear constant-current dimming LED |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202634787U (en) * | 2012-04-28 | 2012-12-26 | 刘四清 | LED light fixture with sectional color-temperature adjustment |
| CN204795790U (en) * | 2015-07-22 | 2015-11-18 | 江门市科隆达半导体照明有限公司 | LED constant -current drive circuit of luminance / colour temperature is adjusted in segmentation |
| CN106195659A (en) * | 2016-07-27 | 2016-12-07 | 佛山市国星光电股份有限公司 | A kind of COB light source and integration module and light fixture |
| CN206698471U (en) * | 2017-03-30 | 2017-12-01 | 新和（绍兴）绿色照明有限公司 | One kind switch multistage linear constant-current dimming LED |
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Effective date of registration: 20200422 Address after: 322009 NO.901, Longqi Road, Suxi Town, Yiwu City, Jinhua City, Zhejiang Province Patentee after: Harmony Mingxin (Yiwu) Photoelectric Technology Co., Ltd Address before: 312071 Zhejiang province Shaoxing Paojiang Industrial Zone No. 308 North Road in the robe Patentee before: SUNNY WORLD (SHAOXING) GREEN LIGHTING Co.,Ltd. |