CN110099484A - A kind of LED light adjusting circuit - Google Patents
A kind of LED light adjusting circuit Download PDFInfo
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- CN110099484A CN110099484A CN201910350054.3A CN201910350054A CN110099484A CN 110099484 A CN110099484 A CN 110099484A CN 201910350054 A CN201910350054 A CN 201910350054A CN 110099484 A CN110099484 A CN 110099484A
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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]
Abstract
The invention discloses a kind of LED light adjusting circuit, the input of angle signal TRIAC termination TRIAC detection circuit is connected in alternating current source AC；The output of TRIAC detection circuit connects one end input of combined control circuit；PWM duty cycle signal end PWM connects the input of PWM detection circuit；The output of PWM detection circuit connects the other end input of combined control circuit；The third input of combined control circuit meets alternating current source AC angle of flow signal end TRIAC；The output of combined control circuit connects the input of drive control circuit respectively；Two of drive control circuit export two inputs for connecing load respectively.It the advantage is that the regulatory function for being mainly used for the fields such as AC-DC power supply, LED driving and other systems based on light modulator or/and pwm signal or/and analog signal control work and realizing to output voltage or electric current, the compatibility that can reliably realize various control mode, widens the application range of product；Applied to boosting boost framework, buck buckBoost/ flyback flyback framework, decompression buck framework and linear framework.
Description
Technical field
The invention discloses a kind of LED light adjusting circuit, it is mainly used for the fields such as AC-DC power supply, LED driving and other is based on
Light modulator or/and pwm signal or/and analog signal control the system of work and realize the adjusting function to output voltage or electric current
Can, it can reliably realize the compatibility of various control mode, widen the application range of product.Present invention could apply to boost
Boost framework, buck buckBoost/ flyback flyback framework, decompression buck framework and linear framework.
Background technique
With the continuous development of Internet of Things and smart home, pwm signal and 0 arrives 10V signal dimming mode with it to intelligence
The favorable compatibility of control is widely used.
And it is traditional silicon-controlled or after cut light modulator and be still widely used.
When the access of the light adjusting circuit of compatible PWM brightness adjustment control there are it is silicon-controlled or after cut in the electricity network of light modulator when,
It will appear and electric current deficiency is maintained to cause the light modulation compatibling problem such as lamp sudden strain of a muscle.
If removing original light modulator, need to carry out track remodelling, increases human cost, be unfavorable for intellectual product
It promotes.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of LED light adjusting circuit, can it is compatible silicon controlled or after cut light modulator
With PWM dimmer application, track remodelling is avoided, to reduce the cost of labor of product replacement, widens the application range of product.
The present invention provides a kind of LED light adjusting circuit, comprising: TRIAC detection circuit, PWM detection circuit, combination control electricity
Road, drive control circuit, load；Alternating current source AC angle of flow signal end TRIAC connects the input of TRIAC detection circuit；TRIAC detection
The output of circuit connects one end input of combined control circuit；TRIAC detection circuit detect it is silicon-controlled or/and after cut cutting for light modulator
Phase duty cycle signals Qtriac；PWM duty cycle signal end PWM connects the input of PWM detection circuit；The output of PWM detection circuit connects
The other end of combined control circuit inputs；PWM detection circuit detects pwm signal or/and simulates the duty cycle signals of dim signal
Qpwm；The third input of combined control circuit meets alternating current source AC angle of flow signal end TRIAC；The output end of combined control circuit
Connect the input of drive control circuit；Duty cycle information and the PWM detection that combined control circuit is used to export TRIAC detection circuit
The duty cycle information of circuit output is converted into the reference voltage information and driving enable signal of drive control；Drive control circuit
Two export two inputs for connecing load respectively；Drive control circuit is according to reference voltage information or/and drives enabled information control
Make the output voltage or/and electric current of load.
The present invention provides a kind of LED light adjusting circuit, has a feature in that TRIAC detection circuit includes oscillator 1 and meter
Number device 1；The output of oscillator 1 connects the input end of clock of counter 1；Alternating current source AC angle of flow signal end TRIAC connects counter 1
Enabled synchronous input end；The output of counter 1 terminates combined control circuit.
The present invention provides a kind of LED light adjusting circuit, and can also have the following features: PWM detection circuit includes oscillator 2
With counter 2；The output of oscillator 2 connects the input end of clock of counter 2；PWM duty cycle signal end PWM connects making for counter 2
It can synchronous input end；The output of counter 2 terminates combined control circuit.
The present invention provides a kind of LED light adjusting circuit, and can also have the following features: combined control circuit includes that ratio becomes
Change circuit 1, scaling circuitry 2, comparator A, selector A, filter, oscillator 3, counter 3；Scaling circuitry 1
Input connects the output of TRIAC detection circuit；The output of scaling circuitry 1 connects an input terminal of comparator A, selection respectively
An input terminal of device A；The input of scaling circuitry 2 connects the output of PWM detection circuit；The output of scaling circuitry 2 connects
Another input terminal of another input terminal of comparator A, selector A；The gating that the output end of comparator A meets selector A is defeated
Enter end；The input terminal of the output termination filter of selector A；The count control input of the output termination counter 3 of filter
(cnt)；The input end of clock of the output termination counter 3 of oscillator 3；Alternating current source AC angle of flow signal end (TRIAC) connects counting
The synchronous input end (syn) of device 3,3 output end of counter (EN) connect another input of drive control circuit.
The present invention provides a kind of LED light adjusting circuit, and can also have the following features: combined control circuit further includes number
Analog converter DAC；The input terminal of the output termination digital analog converter DAC of filter；Digital analog converter DAC's is defeated
Outlet (Vref) connects an input of drive control circuit.
The present invention provides a kind of LED light adjusting circuit, and can also have the following features: scaling circuitry 1 includes selection
Device 1, comparator 1, comparator 2, comparator 3, multiplier 1, selector 2, subtracter 1 and selector 3；One of comparator 1 is defeated
Enter to terminate stationary digital signal Nref1, the output of another input termination TRIAC detection circuit, output end meets the one of selector 1
A input terminal；One input of comparator 2 terminates stationary digital signal Nref2, another input termination TRIAC detection circuit
Output, output end connect an input terminal of selector 2 and selector 3 respectively；The input termination stationary digital letter of comparator 3
Number Nref3, the output of another input termination TRIAC detection circuit, output end meet one of selector 2 and selector 3 respectively
Input terminal；The input termination stationary digital signal Nref4 of selector 1, an input terminate stationary digital signal Nref5,
One input terminal of output termination multiplier 1；The output of another input termination TRIAC detection circuit of multiplier 1, output end
Connect an input terminal of subtracter 1；The input termination stationary digital signal Nref6 of selector 2, an input termination are fixed
Digital signal Nref7, an input terminal of output termination subtracter 1；The output of one input termination subtracter 1 of selector 3
End, input termination stationary digital signal Nref8, an input terminate stationary digital signal Nref9；Output termination comparator
An input terminal of A.
The present invention provides a kind of LED light adjusting circuit, and can also have the following features: scaling circuitry 2 includes selection
Device 4, comparator 4 and multiplier 2；One input of multiplier 2 terminates stationary digital signal Nref10, and an input terminates PWM
The output of detection circuit, output end connect an input terminal of selector 4；One input of comparator 4 terminates stationary digital signal
Nref12, the output of an input termination PWM detection circuit, output end connect an input terminal of selector 4；The one of selector 4
A input terminates stationary digital signal Nref11, another input terminal of output termination comparator A.
The present invention provides a kind of LED light adjusting circuit, and can also have the following features: drive control circuit includes error
Amplifier EA, capacitor Ccomp, voltage-controlled timer, rest-set flip-flop, driving circuit, switch M1, current sense resistor Rcs, transformer
T1, diode Dout, output capacitance Cout, rectifier bridge, pi type filter capacitor Cpi1, pi type filter inductance Lpi, pi type filtered electrical
Hold Cpi2, bleeder resistance Rrc and the capacitor Crc that releases；The input of rectifier bridge meets alternating current source AC；One end of pi type filter capacitor Cpi1
Connect an output end of rectifier bridge, other end ground connection；One output end of a termination rectifier bridge of pi type filter inductance Lpi, separately
The primary side anode of one termination transformer T1；The primary side anode of a termination transformer T1 of pi type filter capacitor Cpi2, another termination
Ground；The primary side anode of a termination transformer T1 of current sense resistor Rcs, another termination vent discharge hold one end of Crc；Vent discharge
Hold the other end ground connection of Crc；The input negative terminal of error amplifier EA connects the output current signal end (Ics) of switch M1 source electrode；It is defeated
Enter the output end (Vref) or reference voltage Vref2 of positive termination combined control circuit, output terminates the input terminal of voltage-controlled timer；
The output end of a termination error amplifier EA of capacitor Ccomp, other end ground connection；The input S of rest-set flip-flop terminates transformer T1
Secondary side anode demagnetization signal end (deMag)；The input R of rest-set flip-flop terminates the output end of voltage-controlled timer；Rest-set flip-flop
EN termination combined control circuit output end (EN) or logic high；The input of the output termination driving circuit of rest-set flip-flop
End；The grid of the output termination switch M1 of driving circuit；The drain of switch M1 connects the primary side negative terminal of transformer T1；Current detecting electricity
Hinder the source level of a termination switch M1 of Rcs, other end ground connection；The anode of the negative terminating diode Dout in the secondary side of transformer T1；It is defeated
One end of capacitor Cout is an output end of drive control circuit out, connects the secondary side anode of transformer T1；The other end is driving
The another output of control circuit connects the negative terminal of diode Dout.
The present invention provides a kind of LED light adjusting circuit, and can also have the following features: drive control circuit includes error
Amplifier EA, capacitor Ccomp, voltage-controlled timer, rest-set flip-flop, driving circuit, switch M1, current sense resistor Rcs, transformer
T1, diode Dout, output capacitance Cout, rectifier bridge, pi type filter capacitor Cpi1, pi type filter inductance Lpi, pi type filtered electrical
Hold Cpi2, bleeder resistance Rrc and the capacitor Crc that releases；The input of rectifier bridge meets alternating current source AC；One end of pi type filter capacitor Cpi1
Connect an output end of rectifier bridge, other end ground connection；One output end of a termination rectifier bridge of pi type filter inductance Lpi, separately
The primary side anode of one termination transformer T1；The primary side anode of a termination transformer T1 of pi type filter capacitor Cpi2, another termination
Ground；The primary side anode of a termination transformer T1 of current sense resistor Rcs, another termination vent discharge hold one end of Crc；Vent discharge
Hold the other end ground connection of Crc；The input negative terminal of error amplifier EA connects the output current signal end (Ics) of switch M1 source electrode；It is defeated
Enter the output end (Vref) of positive termination combined control circuit, output terminates the input terminal of voltage-controlled timer；One end of capacitor Ccomp
Connect the output end of error amplifier EA, other end ground connection；The demagnetization of the secondary side anode of the input S termination transformer T1 of rest-set flip-flop
Signal end (deMag)；The input R of rest-set flip-flop terminates the output end of voltage-controlled timer；The EN termination combination control of rest-set flip-flop
The output end (EN) or logic high of circuit；The input terminal of the output termination driving circuit of rest-set flip-flop；Driving circuit it is defeated
The grid of switch M1 is terminated out；The drain of switch M1 connects the primary side negative terminal of transformer T1；A termination of current sense resistor Rcs is opened
Close the source level of M1, other end ground connection；The anode of the negative terminating diode Dout in the secondary side of transformer T1；One end of output capacitance Cout
For an output end of drive control circuit, the secondary side anode of transformer T1 is connect；The other end is another of drive control circuit
Output end connects the negative terminal of diode Dout.
The present invention provides a kind of LED light adjusting circuit, and the ratio that can also have the following features: in combined control circuit becomes
It changes circuit 1 and scaling circuitry 2 is modeled voltage conversion circuit replacement；Comparator A and/or selector A are weighted adder
Or analog comparator A or gating switch substitute；Oscillator 3 and counter 3 are substituted by voltage-controlled timer.
The present invention provides a kind of LED light adjusting circuit, can also have the following features: the filter in combined control circuit
For digital filter or analog filter.
The present invention provides a kind of LED light adjusting circuit, and the error that can also have the following features: in drive control circuit is put
Big device EA and capacitor Ccomp is substituted with digital error amplifier.
The present invention provides a kind of LED light adjusting circuit, and can also have the following features: LED light adjusting circuit can be applied to
Boost boost framework, buck buckBoost/ flyback flyback framework, decompression buck framework and linear framework.
A kind of LED light adjusting circuit provided by the invention, due to increasing light modulator and PWM mixing control function, dynamic is adjusted
Economize on electricity road benchmark and/or switch the working time, can it is compatible silicon controlled and/or after cut light modulator and/or PWM dimmer application,
Track remodelling is carried out when product being avoided to replace, to reduce the cost of labor of product replacement, widens the application range of product.
Detailed description of the invention
Fig. 1 is the block diagram of the LED light adjusting circuit in embodiment.
Fig. 2 is a kind of implementation of the LED light adjusting circuit in embodiment.
Fig. 3 is a kind of implementation of the scaling circuitry 1 in embodiment.
Fig. 4 is a kind of implementation of the scaling circuitry 2 in embodiment.
Fig. 5 is a kind of work wave of implementation of the LED light adjusting circuit in the present invention.
Fig. 6 is that a kind of transformation of scale of scaling circuitry 1 in a kind of implementation of the LED light modulation electricity in the present invention is bent
Line.
Fig. 7 is that a kind of transformation of scale of scaling circuitry 2 in a kind of implementation of the LED light modulation electricity in the present invention is bent
Line.
Specific embodiment:
Below in conjunction with attached drawing, the present invention will be further described.
Fig. 1 is the block diagram of the LED light adjusting circuit in the present invention.
As shown in Figure 1, a kind of LED light adjusting circuit, comprising: TRIAC detection circuit, PWM detection circuit, combination control electricity
Road, drive control circuit, load.
Alternating current source AC angle of flow signal end TRIAC connects the input of TRIAC detection circuit.The output of TRIAC detection circuit connects
One end of combined control circuit inputs.PWM duty cycle signal end PWM connects the input of PWM detection circuit.PWM detection circuit it is defeated
The other end input of combined control circuit is connect out.The third input of combined control circuit connects alternating current source AC angle of flow signal end
TRIAC.Two output ends Vref, EN of combined control circuit connect two inputs of drive control circuit respectively.Drive control electricity
Two of road export two inputs for connecing load respectively.
TRIAC detection circuit be used to detect it is silicon-controlled or/and after cut the cut phase duty cycle information of light modulator.
PWM detection circuit is used to detect pwm signal or/and simulate the duty cycle information of dim signal.
Combined control circuit is used to account for what duty cycle information and PWM detection circuit that TRIAC detection circuit exports exported
Sky is converted into the reference voltage information for drive control than information and drives enabled information.
Drive control circuit is used for according to reference voltage information or/and drives the output voltage of enabled information control load
Or/and electric current.
Fig. 2 is a kind of implementation of the LED light adjusting circuit in the present invention.
As shown in Fig. 2, a kind of implementation of TRIAC detection circuit, including oscillator 1, counter 1.Oscillator 1 it is defeated
The input end of clock of counter 1 is connect out.Alternating current source AC angle of flow signal end TRIAC connects the enabled synchronous input end of counter 1.Meter
Output end of the output end of number device 1 as TRIAC detection circuit, connects the input terminal of scaling circuitry 1 in combined control circuit.
A kind of implementation of PWM detection circuit, including oscillator 2, counter 2.The output of oscillator 2 connects counter 2
Input end of clock.PWM duty cycle signal end PWM connects the enabled synchronous input end of counter 2.The output end conduct of counter 2
The output end of PWM detection circuit connects the input terminal of scaling circuitry 2 in combined control circuit.
A kind of implementation of combined control circuit, including scaling circuitry 1, scaling circuitry 2, comparator A, choosing
Select device A, digital filter, oscillator 3, counter 3, digital analog converter DAC.
Combined control circuit includes scaling circuitry 1, scaling circuitry 2, comparator A, selector A, digital filtering
Device, oscillator 3, counter 3, digital analog converter DAC.
The input of scaling circuitry 1 connects the output of TRIAC detection circuit.Connect the output end of counter 1.Transformation of scale
The output of circuit 1 connects an input terminal of an input terminal of comparator A, selector A respectively.Scaling circuitry 2 it is defeated
Enter to connect the output of PWM detection circuit, that is, connects the output end of counter 1.The output of scaling circuitry 2 meets the another of comparator A
Another input terminal of a input terminal, selector A.The output end of comparator A connects the Strobe input of selector A.Selector A's
The input terminal of output termination digital filter.
Digital filter exports the defeated of the count control input cnt, digital analog converter DAC for terminating counter 3
Enter end.Output end of the output end Vref of digital analog converter DAC as combined control circuit, meets the one of drive control circuit
A input.The input end of clock of the output termination counter 3 of oscillator 3.
Alternating current source AC angle of flow signal end TRIAC connects the synchronous input end syn of counter 3,3 output end EN conduct of counter
The another output of combined control circuit connects another input of drive control circuit.
As shown in figure 3, scaling circuitry 1 includes: selector 1, comparator 1, comparator 2, comparator in the present embodiment
3, multiplier 1, selector 2, subtracter 1 and selector 3.
One input of comparator 1 terminates stationary digital signal Nref1, another input termination TRIAC detection circuit
Output, output end connect an input terminal of selector 1.One input of comparator 2 terminates stationary digital signal Nref2, another
The output of a input termination TRIAC detection circuit, output end connect an input terminal of selector 2 and selector 3 respectively.Comparator
3 input terminates stationary digital signal Nref3, the output of another input termination TRIAC detection circuit, output end difference
Connect an input terminal of selector 2 and selector 3.Selector 1 an input termination stationary digital signal Nref4, one it is defeated
Enter to terminate stationary digital signal Nref5, an input terminal of output termination multiplier 1.Another input termination of multiplier 1
The output of TRIAC detection circuit, an input terminal of output termination subtracter 1.One input of selector 2 terminates stationary digital
Signal Nref6, an input terminate stationary digital signal Nref7, an input terminal of output termination subtracter 1.Selector 3
The output end of one input termination subtracter 1, input termination stationary digital signal Nref8, an input terminate fixed number
Word signal Nref9；An input terminal of output termination comparator A.
Scaling circuitry 1 be used for by it is silicon-controlled or/and after cut light modulator cut phase duty cycle information Qtriac ratio turn
The reference information Qref_triac of corresponding drive control is changed into, to realize optimal dimmer for light control effect.Qtriac and Qref_
The proportionate relationship of triac can be linear relationship, broken line relationship, exponential relationship, quadratic relationship etc. or wherein 2 kinds or a variety of passes
The combination of system.
As shown in figure 4, scaling circuitry 2 includes: selector 4, comparator 4 and multiplier 2 in the present embodiment.Multiplication
One input of device 2 terminates stationary digital signal Nref10, the output of an input termination PWM detection circuit, output end selecting
Select an input terminal of device 4.One input of comparator 4 terminates stationary digital signal Nref12, an input termination PWM detection
The output of circuit, output end connect an input terminal of selector 4.One input of selector 4 terminates stationary digital signal
Nref11, another input terminal of output termination comparator A.
Scaling circuitry 2 is used to for PWM duty cycle information Qpwm ratio being converted into the reference information of corresponding drive control
Qref_pwm, to realize optimal PWM dimming effect.The proportionate relationship of Qpwm and Qref_pwm can be linear relationship, broken line
The combination of relationship, exponential relationship, quadratic relationship etc. or wherein 2 kinds or a variety of relationships.
Digital filter filters out the high-frequency fluctuation of reference information Qref0, prevents for being filtered to reference information Qref0
Only light modulation shake and/or lamp dodge.
A kind of implementation of digital filter, benchmark information Qref0 and reference information Qref, continuous N number of period
(N=0,1,2,3,4 ...) reference information Qref0 be greater than/be less than present reference information Qref, new reference information Qref is more
The weighted average of the new reference information Qref0 for M (M=0,1,2,3,4 ...) a period, otherwise reference information Qref is kept
It is constant.
Another implementation of digital filter, benchmark information Qref0 and reference information Qref, continuous N number of week
Phase (N=0,1,2,3,4 ...) reference information Qref0 be greater than/be less than present reference information Qref, new reference information Qref
It is updated to the weighted average of the reference information Qref0 and present reference information Qref in M (M=0,1,2,3,4 ...) a period
Value, otherwise reference information Qref is remained unchanged.
The third implementation of digital filter, benchmark information Qref0 and reference information Qref, continuous N number of week
Phase (N=0,1,2,3,4 ...) reference information Qref0 be greater than/be less than present reference information Qref, new reference information Qref
It is updated to reference information Qref0, the present reference information Qref and new benchmark letter in M (M=0,1,2,3,4 ...) a period
The weighted average of Qref is ceased, otherwise reference information Qref is remained unchanged.
A kind of implementation of drive control circuit, including error amplifier EA, capacitor Ccomp, voltage-controlled timer, RS
Trigger, driving circuit, switch M1, current sense resistor Rcs, transformer T1, diode Dout, output capacitance Cout, rectification
Bridge, pi type filter capacitor Cpi1, pi type filter inductance Lpi, pi type filter capacitor Cpi2, bleeder resistance Rrc, release capacitor Crc.
The input of rectifier bridge meets alternating current source AC.One output end of a termination rectifier bridge of pi type filter capacitor Cpi1, separately
One end ground connection.One output end of a termination rectifier bridge of pi type filter inductance Lpi, the primary side of another termination transformer T1 is just
End.The primary side anode of a termination transformer T1 of pi type filter capacitor Cpi2, other end ground connection.The one of current sense resistor Rcs
The primary side anode of transformer T1 is terminated, another termination vent discharge holds one end of Crc.Release capacitor Crc the other end ground connection.
The input negative terminal of error amplifier EA connects output current signal end (Ics) the output current signal end of switch M1 source electrode
The signal of Ics is the peak point current of the output of M1 source electrode.The output end (Vref) of the positive termination combined control circuit of input, that is, connect number
The output end Vref of word analog converter；Output terminates the input terminal of voltage-controlled timer.A termination error amplification of capacitor Ccomp
The output end of device EA, other end ground connection.
The demagnetization signal end deMag of the secondary side anode of the input S termination transformer T1 of rest-set flip-flop.Demagnetization signal end
The input R of deMag rest-set flip-flop terminates the output end of voltage-controlled timer.The EN of rest-set flip-flop terminates the defeated of combined control circuit
Outlet (EN), that is, connect the output end of counter 3.The input terminal of the output termination driving circuit of rest-set flip-flop.
The grid of the output termination switch M1 of driving circuit.The drain of switch M1 connects the primary side negative terminal of transformer T1.Electric current
The source level of a termination switch M1 of detection resistance Rcs, other end ground connection.The negative terminating diode Dout in the secondary side of transformer T1 is just
End.
One end of output capacitance Cout is an output end of drive control circuit, connects the secondary side anode of transformer T1.Separately
One end is the another output of drive control circuit, connects the negative terminal of diode Dout.Two termination output capacitance Cout of load
Both ends.
Transformation of scale 1 and transformation of scale 2 in combined control circuit can be substituted with analog voltage conversion circuit.
Comparator A and selector A in combined control circuit can be substituted with weighted summer.
Comparator A and selector A in combined control circuit can be substituted with analog comparator A and gating switch.
Digital filter in combined control circuit can be substituted with analog filter.
Oscillator 3 and counter 3 in combined control circuit can be substituted with voltage-controlled timer.
Error amplifier positive input terminal in drive control circuit can meet reference voltage Vref2, instead of with combine control
The connection of the output end Vref of circuit.
The enabled input terminal of rest-set flip-flop in drive control circuit can connect logic high, instead of with combine control electricity
The connection of the output end EN on road.
Error amplifier EA and capacitor Ccomp in drive control circuit can be substituted with digital error amplifier.
LED light adjusting circuit can be applied to boosting boost framework, buck buckBoost/ flyback flyback framework, drop
Press buck framework and linear framework.
A kind of LED light adjusting circuit provided by the invention, due to increasing light modulator and PWM mixing control function, dynamic is adjusted
Economize on electricity road benchmark and/or switch the working time, can it is compatible silicon controlled and/or after cut light modulator and/or PWM dimmer application,
Track remodelling is carried out when product being avoided to replace, to reduce the cost of labor of product replacement, widens the application range of product.
A kind of concrete operating principle of LED light adjusting circuit are as follows:
As shown in figure 5, in a power frequency period, alternating current source AC angle of flow signal end TRIAC is high electricity when dimmer conduction
It is flat.Conversely, alternating current source AC angle of flow signal end TRIAC is low level when light modulator turns off.In TRIAC detection circuit, alternating current source
When AC angle of flow signal end TRIAC becomes high level from low level, oscillator 1 generates clock of the clock clk1 as counter 1
It is counted.When alternating current source AC angle of flow signal end TRIAC becomes low level from high level, the counting of counter 1 terminates.Thus will
The duty cycle information of alternating current source AC angle of flow signal end TRIAC is converted into digital information Qtriac.
Similarly, in PWM detection circuit, in a PWM switch periods, PWM duty cycle signal end becomes high electricity from low level
Usually, oscillator 2 generates clock clk2 and is counted as the clock of counter 2.PWM duty cycle signal end becomes from high level
When low level, the counting of counter 2 terminates.To which the duty cycle information of PWM duty cycle signal end is converted into digital information Qpwm.
In combined control circuit, light modulator duty cycle information Qtriac progress ratio is converted into pair by scaling circuitry 1
Answer reference information Qref_triac.The proportionate relationship of Qtriac and Qref_triac can be linear relationship, broken line relationship, index
The combination of relationship, quadratic relationship etc. or wherein 2 kinds or a variety of relationships.As shown in fig. 6, being the scaling circuitry of broken line relationship
A kind of 1 implementation.When light modulator duty cycle information Qtriac is larger, reference information Qref_triac keeps maximum, guarantees
Initial power is sufficiently large when maximum conduction angle when light modulation.When light modulator duty cycle information Qtriac is medium, reference information Qref_
Triac is broken line relationship, guarantees light modulation depth when light modulation, and dump power is sufficiently small when the minimum angle of flow when realizing light modulation.It adjusts
When light device duty cycle information Qtriac is smaller, reference information Qref_triac is maintained at a smaller value, guarantees fast tune light modulator
When be not in electric current upper overshoot and lower overshoot.
Similarly, PWM duty cycle information Qpwm progress ratio is converted into corresponding reference information Qref_ by scaling circuitry 2
pwm.The proportionate relationship of Qpwm and Qref_pwm can be linear relationship, broken line relationship, exponential relationship, quadratic relationship etc. or its
In 2 kinds or a variety of relationships combination.As shown in figure 5, a kind of implementation of the scaling circuitry 2 for broken line relationship.PWM is accounted for
When sky is more larger than information Qpwm, reference information Qref_pwm keeps maximum, guarantees certain applications (such as 0~10V dimmer application)
When middle PWM duty cycle signal end cannot achieve 100% duty ratio, full output power output can be realized.Pwm duty cycle information
When Qpwm is medium, reference information Qref_pwm is linear relationship, facilitates the proportionate relationship for calculating PWM duty cycle and exporting electric current.
When pwm duty cycle information Qpwm is smaller, reference information Qref_pwm increases sluggish control, prevents PWM desk lamp with dimmer switch from lamp occur when going out
It dodges.
Comparator A benchmark information Qref_triac and reference information Qref_pwm generate gating signal AS control choosing
It selects device A and exports lesser signal as outputting reference information Qref0.
Another implementation for generating reference information Qref0 is to replace comparator A and selector using weighted summer
A believes reference information Qref_triac and reference information Qref_pwm weighted sum as outputting reference by weighted summer
Cease Qref0.
Qref0=a × Qref_triac+b×Qref_pwm (1)。
Wherein a, b are real number.
Reference information Qref0 is filtered by digital filter, filters out high fdrequency component, to prevent reference information
The shake of Qref0 causes the fluctuation of output electric current, prevents lamp from dodging.
A kind of implementation of digital filter are as follows: benchmark information Qref0 and reference information Qref, continuous N number of week
Phase (N=0,1,2,3,4 ...) reference information Qref0 be greater than/be less than present reference information Qref, new reference information Qref
It is updated to the weighted average of the reference information Qref0 in M (M=0,1,2,3,4 ...) a period, otherwise reference information Qref is protected
It holds constant.
Another implementation of digital filter are as follows: benchmark information Qref0 and reference information Qref, it is continuous N number of
Period (N=0,1,2,3,4 ...) reference information Qref0 be greater than/be less than present reference information Qref, new reference information
Qref is updated to the weighting of the reference information Qref0 and present reference information Qref in M (M=0,1,2,3,4 ...) a period
Average value, otherwise reference information Qref is remained unchanged.
The third implementation of digital filter are as follows: benchmark information Qref0 and reference information Qref, it is continuous N number of
Period (N=0,1,2,3,4 ...) reference information Qref0 be greater than/be less than present reference information Qref, new reference information
Qref is updated to the reference information Qref0, present reference information Qref and new base in M (M=0,1,2,3,4 ...) a period
The weighted average of calibration information Qref, otherwise reference information Qref is remained unchanged.
Fig. 5 is a kind of work wave of implementation of the LED light adjusting circuit in the present invention.
As shown in figure 5, a kind of a kind of example of implementation for digital filter.Benchmark information Qref0 and base
Calibration information Qref, continuous 2 periodic basis information Qref0 be greater than/it is less than present reference information Qref, new reference information
Qref is updated to weighting (weight ratio 1) average value of the reference information Qref0 in 1 period, and otherwise reference information Qref is protected
It holds constant.
Reference information Qref is converted into analog signal reference voltage Vref by DAC.
In drive control circuit, reference voltage Vref controls voltage Vcomp by error amplifier, and then controls voltage-controlled meter
When device timing, to adjust the turn-on time of driving signal drv, and then adjust load current.When reference voltage Vref is lower,
Voltage Vcomp is lower, and the turn-on time of driving signal drv shortens, and reduces load current.Conversely, when reference voltage Vref is got higher
When, voltage Vcomp is got higher, and the turn-on time of driving signal drv is elongated, increases load current.
Meanwhile in combined control circuit, the output of rest-set flip-flop in the output EN control drive control circuit of counter 3.
When the output EN of counter 3 is high level, the normal output drive signal drv of rest-set flip-flop maintains normal output electric current.It counts
The output drive signal drv of rest-set flip-flop is often low when the output EN of device 3 is low level, and switch M1 is often closed, and exports current reduction.
The control mode of the output EN of counter 3 are as follows: when alternating current source AC angle of flow signal end TRIAC is low level, count
It is high level that device 3, which exports EN,.In drive control circuit, the normal output drive signal drv of rest-set flip-flop.Alternating current source AC angle of flow letter
When becoming high level from low level, oscillator 3 generates clock clk3 and is counted as the clock of counter 3, meter by number end TRIAC
Number device 3 exports EN and keeps high level.When 3 count value of counter reaches reference information Qref, counter 3, which exports EN, becomes low
The output drive signal drv of level, rest-set flip-flop is often low, and switch M1 is often closed.When alternating current source AC angle of flow signal end TRIAC is from height
The output of counter 3 EN becomes high level again after level becomes low level.In drive control circuit, rest-set flip-flop normally exports drive
Dynamic signal drv.
Reference information Qref is bigger, and the time of the normal output drive signal drv of rest-set flip-flop is more, and output electric current is bigger.
Otherwise reference information Qref is smaller, and the time of the normal output drive signal drv of rest-set flip-flop is fewer, and output electric current is smaller.
By reference information Qref adjust a power frequency period internal trigger output drive signal drv normal switch when
Between so that input current concentrates on light modulator forward position and light modulator cutoff, thus ensure that dimmer for light control and/or
When PWM is dimmed, preceding light modulator of cutting meets silicon-controlled maintenance electric current, after cut light modulator and can normally detect bus zero passage, guarantee PWM
The light modulation depth of light modulation, improves the compatibility of light modulator.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Any innovation and creation without departing from true spirit range, including but
Driving control current constant voltage/constant current starting control mode such as critical continuous conduction mode is not limited to be substituted for and determine frequency mode or DCM mode
Deng change, triode such as is substituted for by M1 to the replacement of the type or model of component, digital filter is substituted for simulation
The change of filter etc., circuit local structure is such as removed in scaling circuitry 1 or scaling circuitry 2, drive control circuit
Nor gate be changed to NAND gate and realize, remove digital filter, peripheral framework boosting boost is changed to by flyback flyback framework
Replacement, the change of framework, buck buckBoost framework, decompression buck framework or linear framework etc. and other unsubstantialities
Shape or modification, fall within the scope of the present invention.
Claims (13)
1. a kind of LED light adjusting circuit, it is characterised in that: including, TRIAC detection circuit, PWM detection circuit, combined control circuit,
Drive control circuit, load；
Alternating current source AC angle of flow signal end (TRIAC) connects the input of TRIAC detection circuit；The output of TRIAC detection circuit connects group
Close one end input of control circuit；TRIAC detection circuit detect it is silicon-controlled or/and after cut the cut phase duty cycle signals of light modulator
(Qtriac)；
PWM duty cycle signal end (PWM) connects the input of PWM detection circuit；The output of PWM detection circuit connects combined control circuit
Other end input；PWM detection circuit detects pwm signal or/and simulates the duty cycle signals (Qpwm) of dim signal；
The third input of combined control circuit connects alternating current source AC angle of flow signal end (TRIAC)；The output of combined control circuit
Connect the input of drive control circuit；Duty cycle information and the PWM detection that combined control circuit is used to export TRIAC detection circuit
The duty cycle information of circuit output is converted into the reference voltage information and driving enable signal of drive control；
Two of drive control circuit export two inputs for connecing load respectively；Drive control circuit is according to reference voltage information
Or/and drive the output voltage or/and electric current of enabled information control load.
2. LED light adjusting circuit as described in claim 1, it is characterised in that:
Wherein, TRIAC detection circuit includes oscillator 1 and counter 1；
The output of oscillator 1 connects the input end of clock of counter 1；Alternating current source AC angle of flow signal end (TRIAC) connects counter 1
Enabled synchronous input end；The output of counter 1 terminates combined control circuit.
3. LED light adjusting circuit as described in claim 1, it is characterised in that:
Wherein, PWM detection circuit includes oscillator 2 and counter 2；
The output of oscillator 2 connects the input end of clock of counter 2；PWM duty cycle signal end PWM connects the enabled synchronization of counter 2
Input terminal；The output of counter 2 terminates combined control circuit.
4. LED light adjusting circuit as described in claim 1, it is characterised in that:
Wherein, combined control circuit include scaling circuitry 1, scaling circuitry 2, comparator A, selector A, filter,
Oscillator 3, counter 3；
The input of scaling circuitry 1 connects the output of TRIAC detection circuit；The output of scaling circuitry 1 connects respectively compares
One input terminal of an input terminal of device A, selector A；
The input of scaling circuitry 2 connects the output of PWM detection circuit；The output of scaling circuitry 2 meets the another of comparator A
Another input terminal of a input terminal, selector A；
The output end of comparator A connects the Strobe input of selector A；The input terminal of the output termination filter of selector A；
The count control input (cnt) of the output termination counter 3 of filter；
The input end of clock of the output termination counter 3 of oscillator 3；
Alternating current source AC angle of flow signal end (TRIAC) connects the synchronous input end (syn) of counter 3, and 3 output end of counter (EN) connects
Another input of drive control circuit.
5. LED light adjusting circuit as claimed in claim 4, it is characterised in that:
Wherein, combined control circuit further includes digital analog converter DAC；
The input terminal of the output termination digital analog converter DAC of filter；
The output end (Vref) of digital analog converter DAC connects an input of drive control circuit.
6. LED light adjusting circuit as described in claim 4 or 5, it is characterised in that:
Wherein, scaling circuitry 1 includes selector 1, comparator 1, comparator 2, comparator 3, multiplier 1, selector 2, subtracts
Musical instruments used in a Buddhist or Taoist mass 1 and selector 3；
One input of comparator 1 terminates stationary digital signal Nref1, the output of another input termination TRIAC detection circuit,
Output end connects an input terminal of selector 1；
One input of comparator 2 terminates stationary digital signal Nref2, the output of another input termination TRIAC detection circuit,
Output end connects an input terminal of selector 2 and selector 3 respectively；
One input of comparator 3 terminates stationary digital signal Nref3, the output of another input termination TRIAC detection circuit,
Output end connects an input terminal of selector 2 and selector 3 respectively；
The input termination stationary digital signal Nref4 of selector 1, an input terminate stationary digital signal Nref5, output
Terminate an input terminal of multiplier 1；
The output of another input termination TRIAC detection circuit of multiplier 1, an input terminal of output termination subtracter 1；
The input termination stationary digital signal Nref6 of selector 2, an input terminate stationary digital signal Nref7, output
Terminate an input terminal of subtracter 1；
The output end of one of selector 3 input termination subtracter 1, an input terminate stationary digital signal Nref8, one it is defeated
Enter to terminate stationary digital signal Nref9；An input terminal of output termination comparator A.
7. LED light adjusting circuit as described in claim 4 or 5, it is characterised in that:
Wherein, scaling circuitry 2 includes selector 4, comparator 4 and multiplier 2；
One input of multiplier 2 terminates stationary digital signal Nref10, and the output of an input termination PWM detection circuit is defeated
Outlet connects an input terminal of selector 4；
One input of comparator 4 terminates stationary digital signal Nref12, and the output of an input termination PWM detection circuit is defeated
Outlet connects an input terminal of selector 4；
One input of selector 4 terminates stationary digital signal Nref11, another input terminal of output termination comparator A.
8. LED light adjusting circuit as described in claim 1, it is characterised in that:
Wherein, drive control circuit includes error amplifier EA, capacitor Ccomp, voltage-controlled timer, rest-set flip-flop, driving electricity
Road, switch M1, current sense resistor Rcs, transformer T1, diode Dout, output capacitance Cout, rectifier bridge, pi type filtered electrical
Hold Cpi1, pi type filter inductance Lpi, pi type filter capacitor Cpi2, bleeder resistance Rrc and the capacitor Crc that releases；
The input of rectifier bridge meets alternating current source AC；One output end of a termination rectifier bridge of pi type filter capacitor Cpi1, the other end
Ground connection；One output end of a termination rectifier bridge of pi type filter inductance Lpi, the primary side anode of another termination transformer T1；pi
The primary side anode of a termination transformer T1 of type filter capacitor Cpi2, other end ground connection；A termination of current sense resistor Rcs becomes
The primary side anode of depressor T1, another termination vent discharge hold one end of Crc；Release capacitor Crc the other end ground connection；
The input negative terminal of error amplifier EA connects the output current signal end (Ics) of switch M1 source electrode；The positive termination combination control of input
The output end (Vref) or reference voltage Vref2 of circuit processed, output terminate the input terminal of voltage-controlled timer；
The output end of a termination error amplifier EA of capacitor Ccomp, other end ground connection；
The demagnetization signal end (deMag) of the secondary side anode of the input S termination transformer T1 of rest-set flip-flop；The input R of rest-set flip-flop
Terminate the output end of voltage-controlled timer；The output end (EN) or logic high of the EN termination combined control circuit of rest-set flip-flop；
The input terminal of the output termination driving circuit of rest-set flip-flop；
The grid of the output termination switch M1 of driving circuit；The drain of switch M1 connects the primary side negative terminal of transformer T1；
The source level of a termination switch M1 of current sense resistor Rcs, other end ground connection；
The anode of the negative terminating diode Dout in the secondary side of transformer T1；
One end of output capacitance Cout is an output end of drive control circuit, connects the secondary side anode of transformer T1；The other end
For the another output of drive control circuit, the negative terminal of diode Dout is connect.
9. LED light adjusting circuit as described in claim 1, it is characterised in that:
Wherein, drive control circuit includes error amplifier EA, capacitor Ccomp, voltage-controlled timer, rest-set flip-flop, driving electricity
Road, switch M1, current sense resistor Rcs, transformer T1, diode Dout, output capacitance Cout, rectifier bridge, pi type filtered electrical
Hold Cpi1, pi type filter inductance Lpi, pi type filter capacitor Cpi2, bleeder resistance Rrc and the capacitor Crc that releases；
The input of rectifier bridge meets alternating current source AC；One output end of a termination rectifier bridge of pi type filter capacitor Cpi1, the other end
Ground connection；One output end of a termination rectifier bridge of pi type filter inductance Lpi, the primary side anode of another termination transformer T1；pi
The primary side anode of a termination transformer T1 of type filter capacitor Cpi2, other end ground connection；A termination of current sense resistor Rcs becomes
The primary side anode of depressor T1, another termination vent discharge hold one end of Crc；Release capacitor Crc the other end ground connection；
The input negative terminal of error amplifier EA connects the output current signal end (Ics) of switch M1 source electrode；The positive termination combination control of input
The output end (Vref) of circuit processed, output terminate the input terminal of voltage-controlled timer；
The output end of a termination error amplifier EA of capacitor Ccomp, other end ground connection；
The demagnetization signal end (deMag) of the secondary side anode of the input S termination transformer T1 of rest-set flip-flop；The input R of rest-set flip-flop
Terminate the output end of voltage-controlled timer；The output end (EN) or logic high of the EN termination combined control circuit of rest-set flip-flop；
The input terminal of the output termination driving circuit of rest-set flip-flop；
The grid of the output termination switch M1 of driving circuit；The drain of switch M1 connects the primary side negative terminal of transformer T1；
The source level of a termination switch M1 of current sense resistor Rcs, other end ground connection；
The anode of the negative terminating diode Dout in the secondary side of transformer T1；
One end of output capacitance Cout is an output end of drive control circuit, connects the secondary side anode of transformer T1；The other end
For the another output of drive control circuit, the negative terminal of diode Dout is connect.
10. LED light adjusting circuit as described in claim 4 or 5, it is characterised in that: the transformation of scale electricity in combined control circuit
Road 1 and scaling circuitry 2 are modeled voltage conversion circuit replacement；
Comparator and/or selector are weighted adder or analog comparator or gating switch substitution；
Oscillator 3 and counter 3 are substituted by voltage-controlled timer.
11. LED light adjusting circuit as described in claim 4 or 5, it is characterised in that: the filter in combined control circuit is number
Word filter or analog filter.
12. LED light adjusting circuit as claimed in claim 8 or 9, it is characterised in that: the error amplifier in drive control circuit
EA and capacitor Ccomp is substituted with digital error amplifier.
13. LED light adjusting circuit as described in claim 1, it is characterised in that: LED light adjusting circuit can be applied to boosting boost
Framework, buck buckBoost/ flyback flyback framework, decompression buck framework and linear framework.
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