CN109068452A - For the control circuit of LED linear drive system, LED linear driving circuit and method - Google Patents
For the control circuit of LED linear drive system, LED linear driving circuit and method Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
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Abstract
Present invention discloses a kind of for the control circuit of LED linear drive system, LED linear driving circuit and method, LED linear drive system includes controllable silicon dimmer, rectification circuit, LED load and low-dropout linear voltage-regulating circuit LDO, the control circuit include: first input end, the second input, output end；First input end is used to receive the first signal that characterization flows through the electric current of transistor in low-dropout linear voltage-regulating circuit；Second input terminal be used for receives characterization it is rectified after busbar voltage second signal；The control terminal of output end coupling transistors, for control circuit based on the first signal and the second signal for controlling the electric current for flowing through transistor in a turn-on cycle of controllable silicon dimmer, the maximum current of first half cycle is greater than the maximum current in later half period.The present invention is used for control circuit, LED linear driving circuit and the method for LED linear drive system, can reduce circuit power consumption, improves circuit efficiency.
Description
Technical field
The invention belongs to field of LED drive technologies, and in particular to a kind of control circuit for LED linear drive system,
The invention further relates to a kind of LED linear driving circuit and methods.
Background technique
Referring to Fig. 1, Fig. 1 is a kind of existing circuit diagram of linear LED drive circuit.As shown in Figure 1, existing one
The linear LED drive circuit of kind includes thyristor regulating optical circuit 1', rectification circuit 2', leadage circuit 3', LED load 4', low voltage difference
Linear voltage-stabilizing circuit LDO 5', resistance R；The first input end of the output end coupling rectification circuit 2' of thyristor regulating optical circuit 1',
The output end of rectification circuit 2' is respectively coupled to the first end of the anode of LED load 4', leadage circuit 3', the cathode of LED load 4'
The first end of low-dropout linear voltage-regulating circuit LDO 5' is coupled, the second end of leadage circuit 3' is respectively coupled to low pressure difference linearity pressure stabilizing
Second end, the first end of resistance R of circuit LDO 5', the second end ground connection of resistance R.
It is silicon-controlled to need biggish electric current (latching current) in conducting for thyristor regulating optical circuit, and after switch
Only need lesser maintenance electric current that can be held on.The prior art is often used and is let out to make controllable silicon dimmer normally
The Lu Weiqi that discharges provides higher latching current.However, the higher meeting of latching current is so that the biggish energy of leadage circuit consumption, leads
Circuit efficiency is caused to reduce.
In view of this, nowadays there is an urgent need to design a kind of new linear LED drive circuit, to overcome existing linear LED
Drawbacks described above existing for driving circuit.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of control circuit for LED linear drive system, LED
Linear drive circuit and method can reduce circuit power consumption, improve circuit efficiency.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of control circuit for LED linear drive system, LED linear drive system includes controllable silicon dimmer, whole
Current circuit, LED load and low-dropout linear voltage-regulating circuit LDO, the control circuit include:
First input end, for receiving the first letter of the electric current for characterizing the transistor for flowing through low-dropout linear voltage-regulating circuit
Number；
Second input terminal, for receive characterize it is rectified after busbar voltage second signal；
Output end, the control terminal of coupling transistors, control circuit are based on the first signal and the second signal and are used for control system
Electric current is exported in a turn-on cycle of controllable silicon dimmer, is greater than the maximum in later half period in the maximum current of first half cycle
Electric current.
As one embodiment of the present invention, the maximum current in intermediate one third period is less than the rear one third period
Maximum current, the maximum current in rear one third period is less than the maximum current in preceding one third period.
As one embodiment of the present invention, include: inside the control circuit
First waveform generative circuit generates first waveform according to second signal；
Second waveform generating circuit generates the second waveform according to second signal, wherein one in controllable silicon dimmer is led
In the logical period, the value of the early period of the second waveform is less than the value in later period；
Subtraction circuit, first end receive first waveform, and second end receives the second waveform, and output end generates current reference letter
Number；And
Driving circuit, the electric current based on current reference signal control transistor.
As one embodiment of the present invention, according to second signal judge light modulator whether on or off, work as light modulation
When device is connected, first waveform is high level, and when light modulator shutdown, first waveform is zero.
As one embodiment of the present invention, the second Waveform generating circuit includes:
4th waveform generating circuit generates a steamed bun wave when measuring dimmer conduction；And
Steamed bun wave is delayed by delay circuit.
As one embodiment of the present invention, the second Waveform generating circuit includes:
4th waveform generating circuit generates a steamed bun wave when measuring dimmer conduction；
5th waveform generating circuit generates the 5th waveform, wherein before the 5th waveform in a turn-on cycle of light modulator
The value of phase is greater than the value in later period；And
Steamed bun wave is subtracted the 5th signal, obtains the second waveform by subtraction circuit.
As one embodiment of the present invention, the 5th waveform generating circuit receives the first signal, for adjusting the 5th wave
Shape.
As one embodiment of the present invention, a turn-on cycle of the electric current in controllable silicon dimmer of transistor is flowed through
In, the concave curve waveform that the front is high and the back is low is presented.
As one embodiment of the present invention, after the maximum current ratio in preceding one third period, three/two cycles are most
High current is big by 20% or more.
A kind of LED linear driving circuit, comprising:
Controllable silicon dimmer couples the first end of AC power source；
Rectification circuit couples the second end of controllable silicon dimmer and AC power source, provides busbar voltage in DC bus；
Low-dropout linear voltage-regulating circuit, with load in series between DC bus and ground；And
Control circuit as described in any embodiment as above.
A kind of control circuit for LED linear drive system, LED linear drive system includes controllable silicon dimmer, whole
Current circuit, LED load and low-dropout linear voltage-regulating circuit LDO, control circuit include:
First waveform generative circuit generates first waveform according to the turn-on time information of controllable silicon dimmer；
Second waveform generating circuit generates the second waveform according to the turn-on time information of controllable silicon dimmer, wherein can
In a turn-on cycle for controlling silicon light modulator, the value of the early period of the second waveform is less than the value in later period；And
Subtraction circuit generates current reference signal for making first waveform subtract the second waveform；
Control circuit flows through the electric current of transistor based on current reference signal control.
A kind of LED linear drive control method, comprising:
Receive the first signal for characterizing the electric current for the transistor for flowing through low-dropout linear voltage-regulating circuit；
Receive the second signal of characterization busbar voltage；
Based on the first signal and the second signal control system output electric current in a turn-on cycle of controllable silicon dimmer,
The maximum current of first half cycle is greater than the maximum current in later half period.
As one embodiment of the present invention, which comprises control system exports electric current in controllable silicon dimmer
A turn-on cycle in the concave curve shape that the front is high and the back is low is presented.
A kind of control circuit for linear LED drive circuit, the linear LED drive circuit includes: controllable silicon light modulation
Circuit, rectification circuit, LED load, low pressure difference linearity circuit LDO；
The control circuit receives the first signal and table that characterization flows through low pressure difference linearity circuit LDO transistor current Io
The second signal for levying busbar voltage VBUS, for controlling the electric current Io for flowing through low pressure difference linearity circuit LDO, so that low pressure difference linearity
The first maximum current I1 of early period is connected greater than after controlled silicon conducting in a controlled silicon conducting cycle T 0 in circuit LDO electric current
The second maximum current I2 of phase, alternatively, the current average that early period is connected is greater than the current average in controlled silicon conducting later period.
The beneficial effects of the present invention are: the control circuit proposed by the present invention for LED linear drive system, LED line
Property driving circuit and method, by control flow through LDO electric current it is larger in early period, be conducive to maintain holding up for controllable silicon dimmer
Electric current, while the demand to leadage circuit can be reduced and reduce its power consumption generated.
Detailed description of the invention
Fig. 1 is the circuit diagram of existing linear LED drive circuit.
Fig. 2 is the LED linear driving system circuit schematic diagram of one embodiment of the invention.
Fig. 3 is the waveform diagram of voltage VBUS and electric current Io in the control circuit of one embodiment of the invention.
Fig. 4 is the waveform diagram that electric current Io is in the concave curve shape that the front is high and the back is low in one embodiment of the invention.
Fig. 5 is the circuit diagram of control circuit in one embodiment of the invention.
Fig. 6 is the circuit diagram of the second waveform generating circuit in one embodiment of the invention.
Fig. 7 is the waveform diagram of each signal in Fig. 6 circuit of one embodiment of the invention.
Fig. 8 is the circuit diagram of the second waveform generating circuit in one embodiment of the invention.
Fig. 9 is the waveform diagram of each signal of circuit in Fig. 8 of one embodiment of the invention.
Specific embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
For a further understanding of the present invention, the preferred embodiment of the invention is described below with reference to embodiment, still
It should be appreciated that these descriptions are only further explanation the features and advantages of the present invention, rather than to the claims in the present invention
Limitation.
Just for several typical embodiments, the present invention is not limited merely to the model of embodiment description for the description of the part
It encloses.Some technical characteristics in same or similar prior art means and embodiment, which are replaced mutually, also to be described in the present invention
In the range of protection." coupling " or connection in specification, also comprising being indirectly connected with, such as pass through both comprising being directly connected to
The connection that active device, passive device or electrically-conducting medi carry out." multiple " refer to two or more.
Referring to Fig. 2, Fig. 2 is the circuit of LED linear drive system and its control circuit signal in one embodiment of the invention
Figure.As shown in Fig. 2, in one embodiment of the invention, LED linear drive system includes controllable silicon dimmer 20, rectified current
Road 30, LED load 40, low-dropout linear voltage-regulating circuit (LDO) 50 and control circuit 10.Wherein, thyristor regulating optical circuit 20
Input terminal couples the first end of AC power source AC, and output end couples the first input end of rectification circuit 30.Rectification circuit 30 it is defeated
Enter the second end of end coupling thyristor regulating optical circuit 20 and AC power source AC, output end provides busbar voltage at DC bus
VBUS.In the illustrated embodiment, the output end of rectification circuit 30 be respectively coupled to the anode of LED load 40, LED load 40 it is negative
The first end of pole coupling low-dropout linear voltage-regulating circuit (LDO) 50.The first input end of control circuit 10 couples low pressure difference linearity
Voltage regulator circuit (LDO) 50, for receiving current sampling signal V1, the second input terminal coupling DC bus of control circuit 10 is used for
The second signal V2 of busbar voltage VBUS after obtaining sampling rectification.The output end of control circuit 10 couples low pressure difference linearity pressure stabilizing
The control terminal of transistor in circuit (LDO) 50 exports electric current Io for control system.
In the illustrated embodiment, the second end and control circuit 10 of the first end coupling LDO 50 of resistance R, resistance R's
Second end ground connection, the first end of resistance R is for providing the sampled signal V1 for being proportional to electric current.Although it should be known that being shown in figure
Resistance R is used to provide the sample information for characterizing and flowing through electric current in transistor (not shown) in LDO, in other embodiments,
LED linear drive system can not include resistance R and other methods is used to carry out current sample.The setting of transistor in LDO
Mode is the common knowledge of those skilled in the art, is not described herein.
In one embodiment, the position of LDO and load is interchangeable.In one embodiment, the both ends LED can one electricity of parallel connection
Hold.
In one embodiment of the invention, the control circuit 10 includes: first input end, the second input terminal, output
End.First input end is used to receive the first signal V1 of the electric current for the transistor that characterization flows through low-dropout linear voltage-regulating circuit 50；
Second input terminal be used for receives characterization it is rectified after busbar voltage VBUS second signal V2；The control of output end coupling transistors
End processed, control circuit 10 is based on the first signal V1 and second signal for control system output electric current in controllable silicon dimmer 20
In one turn-on cycle, the maximum current I1 of first half cycle is greater than the maximum current I2 in later half period.In a preferred implementation
In example, control circuit control system exports maximum current I1 of the electric current in the preceding one third period and is greater than rear three/two cycles
Maximum current I2.Fig. 3 is seen, Fig. 3 is the waveform diagram of voltage VBUS and electric current Io in control circuit in one embodiment of the invention.
In one embodiment, system output current is the electric current for flowing through LED load.System output current also can refer to system other positions
Electric current.In a preferred embodiment, as shown in Fig. 2, system output current is to flow through low-dropout linear voltage-regulating circuit LDO
The electric current Io of middle transistor.
In a preferred embodiment of the invention, control circuit control system exports electric current the one of controllable silicon dimmer
In a turn-on cycle, the maximum current in intermediate one third period is less than the maximum current in rear one third period, rear three/
The maximum current in one period is less than the maximum current in preceding one third period.
In one embodiment of the invention, the maximum current in half period is less than rear four among system output current
The maximum current in/mono- period, the maximum current in rear a quarter period are less than the maximum current in preceding a quarter period；Its
In, the period refers to a turn-on cycle of controllable silicon dimmer 20.
In one embodiment of the invention, control circuit receive characterization flow through the signal V1 of LDO transistor current Io with
And the signal V2 of characterization busbar voltage VBUS, it is the asymmetric waveform that the front is high and the back is low for controlling electric current Io waveform.
In one embodiment of the invention, the present invention is in conducting beforehand control by the electric current Io that LDO is flowed through in control
Higher value falls to lower value in the maintenance phase, so that LDO electric current is in a controlled silicon conducting cycle T 0, early period is most
High current I1 is greater than the maximum current I2 in later period, meets the rule of controlled silicon conducting.In one embodiment, a conducting week
In phase T0, the maximum current I1 in preceding one third period is greater than the maximum current I2 of rear three/two cycles.In one embodiment
In, the maximum current I1 in preceding a quarter period is greater than the maximum current I2 in rear a quarter period.In one embodiment, preceding
The maximum current I2 of three/two cycles is big by 20% or more after the maximum current I1 ratio in one third period.By increasing early period
Electric current is conducive to the latching current for maintaining light modulator, in this way, the use of leadage circuit can be saved, or reduces leadage circuit
In current value, to reduce the power loss of leadage circuit.In one embodiment of the invention, VBUS and Io current waveform can be with
As shown in Figure 3.
Referring to Fig. 4, Fig. 4 is electric current Io schematic diagram in one embodiment of the invention；As shown in figure 4, in a reality of the invention
It applies in example, electric current is in the concave curve shape that the front is high and the back is low.When voltage of VBUS is higher namely when LDO both end voltage is higher, drop
The value of low current advantageously reduces the loss on LDO.In one embodiment, in a controlled silicon conducting cycle T 0, wherein
The maximum current of intermediate half period (1/4T0-3/4T0) is less than the maximum current of rear a quarter period (3/4T0-T0)
I2, the maximum current I2 of rear a quarter period (3/4T0-T0) are less than the maximum current I1 in preceding a quarter period.
For ease of description, Fig. 3 electric current Io shown in Fig. 4 for flowing through LDO is shown as moment when T0 starts and rises to one
High level I1, however in practical applications, the waveform of electric current Io may include the process that there is the slave zero of gradient to rise.Electric current Io's
Waveform may include the process for dropping to zero with gradient.
Referring to Fig. 5, Fig. 5 is the circuit diagram of control circuit in one embodiment of the invention；As shown in figure 5, in this hair
It include: first waveform generative circuit 11, the second waveform generating circuit inside the control circuit 10 in bright one embodiment
12, subtraction circuit 13 and driving circuit 14.
In one embodiment of this invention, first waveform generative circuit 11 generates first waveform S1 according to second signal V2；
Second waveform generating circuit 12 generates the second waveform S2 according to second signal V2, wherein in the conducting week of controllable silicon dimmer
Interim, the value of the early period of the second waveform S2 is less than the value in later period；The first end of subtraction circuit 13 receives first waveform S1, second end
The second waveform S2 is received, output end generates current reference signal S3；Driving circuit 14 is based on current reference signal S3 and controls electric current
Io.In one embodiment of the invention, according to second signal V2 judge light modulator whether on or off, work as dimmer conduction
When, first waveform S1 is high level, and when light modulator shutdown, first waveform S1 is zero.Certainly, first waveform can also have it
His shape, can have the value of consecutive variations is such as in the right-angled trapezium shape that the front is high and the back is low, is not limited to binary signal.
In one embodiment of this invention, first waveform generative circuit 11 is according to the turn-on time information of controllable silicon dimmer
Generate first waveform S1；Second waveform generating circuit 12 generates the second waveform according to the turn-on time information of controllable silicon dimmer
S2, wherein the second waveform S2, in a turn-on cycle T0 of controllable silicon dimmer, the value of early period is less than the value in later period；Subtraction electricity
Road 13 generates current reference signal S3 for making first waveform S1 subtract the second waveform S2；It is controlled and is flowed based on current reference signal S3
Cross the current following signal S3 of transistor.
As shown in figure 5, in one embodiment of this invention, compared with can be set between subtraction circuit 13 and driving circuit 14
Device 15, the output end of the normal phase input end connection subtraction circuit 13 of comparator 15, the negative-phase input connection first of comparator 15
Signal V1；The output end of comparator 15 connects driving circuit 14.
Referring to Fig. 6, Fig. 6 is the circuit diagram of the second waveform generating circuit in one embodiment of the invention；Such as Fig. 6 institute
Show, in one embodiment of the invention, the second Waveform generating circuit 12 includes the 4th waveform generating circuit 121 and delay electricity
Road 122.When measuring dimmer conduction, the 4th waveform generating circuit 121 generates a steamed bun wave；Delay circuit 122 is by steamed bun
Wave delay.
In addition, as shown in fig. 6, the second Waveform generating circuit 12 can also include comparator 120, the positive of comparator 120
Input terminal connects second signal V2, and the negative-phase input of comparator 120 connects reference voltage Vref, the output end of comparator 120
Connect the 4th waveform generating circuit 121.Comparator 120 judges whether second signal V2 is greater than reference voltage Vref；When the second letter
When number V2 is greater than reference voltage Vref, i.e., when judgement measures dimmer conduction, the 4th waveform generating circuit 121 generates a signal
S4 such as half-wave is sinusoidal or S4 is delayed or is carried out phase shift by steamed bun wave, delay circuit 122.
A typical waveform of the invention is as shown in fig. 7, Fig. 7 is each in 6 circuit of corresponding diagram of one embodiment of the invention
The waveform diagram of signal.Wherein, S1 is high level in VBUS>Vref, is low value or zero in VBUS<Vref；Wherein Vref is
The value of one very little, so that the high level section of S1 is substantially equal to the period of dimmer conduction.S4 is high electricity in VBUS > Vref, that is, S1
It is a half-wave sine wave or a steamed bun wave, or corresponding VBUS waveform during flat, by a waveform electricity can occur for waveform S4
Road provides, and can also be obtained by sampling busbar voltage VBUS.S2 is signal of the S4 by delay, or is claimed by phase backward
Mobile phase shift signalling.S3 is that S1 signal subtracts the signal that S2 signal obtains.Compared by S3 signal and Io sampled signal V1
Compared with, and then the state of the transistor in LDO is controlled, so that Io follows S3 shape, electric current early period when light modulator is just connected is presented
It is higher, the lower asymmetrically shape of later period electric current.
Referring to Fig. 8, Fig. 8 is the circuit diagram of the second waveform generating circuit in another embodiment of the present invention；In this hair
In a bright embodiment, the second Waveform generating circuit 12 includes the 4th waveform generating circuit 121, the 5th waveform generating circuit 124
And subtraction circuit 125.
When measuring dimmer conduction, the 4th waveform generating circuit 121 generates a steamed bun wave；One in light modulator is led
In the logical period, the 5th waveform generating circuit 124 generates the 5th waveform S5, wherein the value of the 5th waveform S5 early period is greater than the later period
Value；Steamed bun wave S4 is subtracted the 5th signal S2 by subtraction circuit 125, obtains the second waveform S2.5th waveform generating circuit 124 may be used also
To receive the first signal V1, for adjusting the 5th waveform S5 according to the value of current sampling signal V1.
In one embodiment of the invention, the second Waveform generating circuit 12 can also include comparator 123, comparator
123 normal phase input end connects second signal V2, and the negative-phase input of comparator 123 connects reference voltage Vref, comparator 123
Output end connect the 4th waveform generating circuit 121.
In some embodiments of the invention, a turn-on cycle of the electric current in controllable silicon dimmer of transistor is flowed through
In, the concave curve waveform that the front is high and the back is low is presented.The maximum of three/two cycles after the maximum current ratio in preceding one third period
Electric current is big by 20% or more.
In one embodiment of this invention, steamed bun wave is subtracted the 5th waveform S5 by subtraction circuit 125, wherein the 5th waveform S5
In a turn-on cycle T0 of controllable silicon dimmer, the value of early period is greater than the value in later period；Waveform is as shown in Figure 9.
In one embodiment, as shown in figure 8, in order to realize the constant current effect in each turn-on cycle, the 5th waveform
S5 can adjust in real time the value of the 5th waveform S5 further by the control of electric current Io sampled signal V1.
Certainly, control circuit may also include other components, carry out other controls, such as control the voltage at the both ends LDO with
With VBUS etc., it is not shown here.
In certain embodiments of the present invention, LED linear drive system includes controllable silicon dimmer, rectification circuit, LED
Load and low-dropout linear voltage-regulating circuit LDO；Control circuit for LED linear drive system includes: that first waveform generates electricity
Road, the second waveform generating circuit, subtraction circuit (can refer to Fig. 5).The first waveform generative circuit is according to controllable silicon dimmer
Turn-on time information generate first waveform；Second waveform generating circuit is generated according to the turn-on time information of controllable silicon dimmer
Second waveform, wherein the value of the early period of the second waveform is less than the value in later period in a turn-on cycle of controllable silicon dimmer；Subtract
Method circuit generates current reference signal for making first waveform subtract the second waveform；Control circuit is based on current reference signal control
System flows through the electric current of transistor.
In certain embodiments of the present invention, linear LED drive circuit include: thyristor regulating optical circuit, rectification circuit,
LED load, low-dropout linear voltage-regulating circuit LDO；The present invention receives characterization for the control circuit of linear LED drive circuit and flows through
The first signal of low-dropout linear voltage-regulating circuit LDO transistor current Io and the second signal for characterizing busbar voltage VBUS are used
The electric current Io of low-dropout linear voltage-regulating circuit LDO is flowed through in control, so that low-dropout linear voltage-regulating circuit LDO electric current can at one
It controls in silicon turn-on cycle T0, the first maximum current that early period is connected is greater than second maximum current in controlled silicon conducting later period, alternatively,
The current average that early period is connected is greater than the current average in controlled silicon conducting later period.Specific control mode is retouched more than can be found in
It states, naturally it is also possible to select other implementations.
The present invention also discloses a kind of LED linear driving circuit, comprising: controllable silicon dimmer, rectification circuit, low pressure difference linearity
Voltage regulator circuit, control circuit.The first end of controllable silicon dimmer coupling AC power source；Rectification circuit couple controllable silicon dimmer and
The second end of AC power source provides busbar voltage in DC bus；Low-dropout linear voltage-regulating circuit and load in series are in direct current mother
Between line and ground；The control circuit can be any of the above-described control circuit.
The present invention also discloses a kind of LED linear drive control method, and in one embodiment of this invention, control method includes
Following steps:
Receive the first signal for characterizing the electric current for the transistor for flowing through low-dropout linear voltage-regulating circuit；
Receive the second signal of characterization busbar voltage；
Control flows through the electric current of transistor in a turn-on cycle of controllable silicon dimmer, and the preceding one third period is most
High current is greater than the maximum current of rear three/two cycles.
In one embodiment of the invention, which comprises control flows through the electric current of transistor in controllable silicon light modulation
The concave curve shape that the front is high and the back is low is presented in one turn-on cycle of device.
The specific control process and implementation of control method of the present invention can refer to the description of the above control circuit part, this
In do not repeat them here.
In one embodiment of this invention, the control method includes:
Receive the first signal that characterization flows through low-dropout linear voltage-regulating circuit LDO transistor current Io；
Receive the second signal of characterization busbar voltage VBUS；
The electric current Io of low-dropout linear voltage-regulating circuit LDO is flowed through in control, so that low-dropout linear voltage-regulating circuit LDO electric current exists
In one controlled silicon conducting cycle T 0, the first maximum current that early period is connected is greater than the second maximum electricity in controlled silicon conducting later period
Stream, alternatively, the current average that early period is connected is greater than the current average in controlled silicon conducting later period.
The specific control process and implementation of control method of the present invention can refer to the description of the above control circuit part, this
In do not repeat them here.
In conclusion it is proposed by the present invention for the control circuit of LED linear drive system, LED linear driving circuit and
Method, the electric current for flowing through LDO by control is larger in early period, is conducive to the latching current for maintaining controllable silicon dimmer, while can
To reduce the demand to leadage circuit and reduce the power consumption of leadage circuit generation.
Description and application of the invention herein are illustrative, is not wishing to limit the scope of the invention to above-described embodiment
In.The deformation and change of embodiments disclosed herein are possible, the realities for those skilled in the art
The replacement and equivalent various parts for applying example are well known.It should be appreciated by the person skilled in the art that not departing from the present invention
Spirit or essential characteristics in the case where, the present invention can in other forms, structure, arrangement, ratio, and with other components,
Material and component are realized.Without departing from the scope and spirit of the present invention, can to embodiments disclosed herein into
The other deformations of row and change.
Claims (14)
1. a kind of control circuit for LED linear drive system, wherein LED linear drive system includes controllable silicon dimmer,
Rectification circuit, LED load and low-dropout linear voltage-regulating circuit, the control circuit include:
First input end, for receiving the first signal for characterizing the electric current for the transistor for flowing through low-dropout linear voltage-regulating circuit；
Second input terminal, for receive characterize it is rectified after busbar voltage second signal；
Output end, the control terminal of coupling transistors, control circuit are based on the first signal and the second signal and export for control system
Electric current is greater than the maximum electricity in later half period in a turn-on cycle of controllable silicon dimmer, in the maximum current of first half cycle
Stream.
2. control circuit as described in claim 1, which is characterized in that the maximum current in intermediate one third period is less than rear three
The maximum current in/mono- period, the maximum current in rear one third period are less than the maximum current in preceding one third period.
3. control circuit as described in claim 1, which is characterized in that inside includes:
First waveform generative circuit generates first waveform according to second signal；
Second waveform generating circuit generates the second waveform according to second signal, wherein in the conducting week of controllable silicon dimmer
Interim, the value of the early period of the second waveform is less than the value in later period；
First subtraction circuit, first end receive first waveform, and second end receives the second waveform, and output end generates current reference letter
Number；And
Driving circuit, the electric current based on current reference signal control transistor.
4. control circuit as claimed in claim 3, which is characterized in that judge whether light modulator is connected or closes according to second signal
Disconnected, when dimmer conduction, first waveform is high level, and when light modulator shutdown, first waveform is zero.
5. control circuit as claimed in claim 3, which is characterized in that the second Waveform generating circuit includes:
4th waveform generating circuit generates a steamed bun wave when measuring dimmer conduction；And
Steamed bun wave is delayed by delay circuit.
6. control circuit as claimed in claim 3, which is characterized in that the second Waveform generating circuit includes:
4th waveform generating circuit generates a steamed bun wave when measuring dimmer conduction；
5th waveform generating circuit generates the 5th waveform in a turn-on cycle of light modulator, wherein the 5th waveform early period
Value is greater than the value in later period；And
Steamed bun wave is subtracted the 5th signal, obtains the second waveform by the second subtraction circuit.
7. control circuit as claimed in claim 6, which is characterized in that the 5th waveform generating circuit receives the first signal, is used for
Adjust the 5th waveform.
8. control circuit as described in claim 1, which is characterized in that flow through the electric current of transistor the one of controllable silicon dimmer
In a turn-on cycle, the concave curve waveform that the front is high and the back is low is presented.
9. control circuit as described in claim 1, which is characterized in that three after the maximum current ratio in preceding one third period/
The maximum current of two cycles is big by 20% or more.
10. a kind of LED linear driving circuit characterized by comprising
Controllable silicon dimmer couples the first end of AC power source；
Rectification circuit couples the second end of controllable silicon dimmer and AC power source, provides busbar voltage in DC bus；
Low-dropout linear voltage-regulating circuit, with load in series between DC bus and ground；And
Such as the described in any item control circuits of claim 1-9.
11. a kind of control circuit for LED linear drive system, which is characterized in that LED linear drive system includes silicon-controlled
Light modulator, rectification circuit, LED load and low-dropout linear voltage-regulating circuit, control circuit include:
First waveform generative circuit generates first waveform according to the turn-on time information of controllable silicon dimmer；
Second waveform generating circuit generates the second waveform according to the turn-on time information of controllable silicon dimmer, wherein silicon-controlled
In one turn-on cycle of light modulator, the value of the early period of the second waveform is less than the value in later period；And
Subtraction circuit generates current reference signal for making first waveform subtract the second waveform；
Control circuit flows through the electric current of transistor based on current reference signal control.
12. a kind of LED linear drive control method characterized by comprising
Receive the first signal for characterizing the electric current for the transistor for flowing through low-dropout linear voltage-regulating circuit；
Receive the second signal of characterization busbar voltage；
Based on the first signal and the second signal control system output electric current in a turn-on cycle of controllable silicon dimmer, first half
The maximum current in period is greater than the maximum current in later half period.
13. method as claimed in claim 12, which is characterized in that the described method includes: control system exports electric current controllable
The concave curve shape that the front is high and the back is low is presented in one turn-on cycle of silicon light modulator.
14. a kind of control circuit for linear LED drive circuit, which is characterized in that the linear LED drive circuit includes:
Thyristor regulating optical circuit, rectification circuit, LED load, low-dropout linear voltage-regulating circuit；
The control circuit receives the first signal and characterization bus electricity that characterization flows through low pressure difference linearity circuit chip tube current
The second signal of pressure, for controlling the electric current for flowing through low pressure difference linearity circuit, so that low pressure difference linearity circuit LDO electric current is at one
In controlled silicon conducting cycle T 0, the first maximum current I1 that early period is connected is greater than second maximum current in controlled silicon conducting later period
I2, alternatively, the current average that early period is connected is greater than the current average in controlled silicon conducting later period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811128561.4A CN109068452A (en) | 2018-09-27 | 2018-09-27 | For the control circuit of LED linear drive system, LED linear driving circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811128561.4A CN109068452A (en) | 2018-09-27 | 2018-09-27 | For the control circuit of LED linear drive system, LED linear driving circuit and method |
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| KR20170009455A (en) * | 2015-07-17 | 2017-01-25 | 주식회사 실리콘웍스 | Lighting apparatus |
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| CN209314124U (en) * | 2018-09-27 | 2019-08-27 | 深圳市必易微电子有限公司 | Control circuit, LED linear driving circuit for LED linear drive system |
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| CN103096592A (en) * | 2013-01-07 | 2013-05-08 | 浙江工业大学 | High voltage light-emitting diode (LED) lamp bead driving power supply controlled by sectional indentation type current |
| JP2015211014A (en) * | 2014-04-30 | 2015-11-24 | コイズミ照明株式会社 | Illumination system and lighting fixture |
| KR20170009455A (en) * | 2015-07-17 | 2017-01-25 | 주식회사 실리콘웍스 | Lighting apparatus |
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