CN106488611A - The circuit of LED controllable silicon phase controlled light modulator and its elimination stroboscopic, method - Google Patents
The circuit of LED controllable silicon phase controlled light modulator and its elimination stroboscopic, method Download PDFInfo
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- CN106488611A CN106488611A CN201610989861.6A CN201610989861A CN106488611A CN 106488611 A CN106488611 A CN 106488611A CN 201610989861 A CN201610989861 A CN 201610989861A CN 106488611 A CN106488611 A CN 106488611A
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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]
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Abstract
The invention discloses the circuit of LED controllable silicon phase controlled light modulator and its elimination stroboscopic, method, wherein, the circuit includes rectification module, energy-storage module and the frequent flashing control module that disappears.The size of the phase adjusted value of two more adjacent commutation cycles of the frequent flashing control module that disappears；In the phase adjusted value big commutation cycle, the ON time of LED string is extended to LED statements based on collusion electricity by energy-storage module, the ON time in the commutation cycle for making ON time of the LED string in the phase adjusted value big commutation cycle little with phase adjusted value is consistent；I.e. so that in two adjacent commutation cycles, the ON time of LED string is consistent, eliminates stroboscopic.
Description
Technical field
The present invention relates to field of LED illumination, more particularly to a kind of LED controllable silicon phase controlled light modulator and its elimination stroboscopic
Circuit, method.
Background technology
In the prior art, the phase controlled light modulator that is realized using bidirectional triode thyristor, due to the forward direction of bidirectional triode thyristor
Trigger current is different from reverse trigger current, causes the positive phase place for adjusting of phase controlled light modulator output and the reverse phase for adjusting
Position is inconsistent；It is inconsistent with the regulation phase place of even cycle that odd cycle is converted into after rectifier bridge；LED is finally embodied in
On be that odd cycle is inconsistent with the brightness of even cycle, i.e., LED can flash, and frequency is consistent with line voltage, usually 50hz, can
See stroboscopic.
As shown in figure 1, positive control phase place is θ 1, Reverse Turning Control phase place is θ 2, it is assumed that θ 1<θ 2, the first commutation cycle LED
The time that lights is longer than the time that the second commutation cycle LED is lighted, so second rectification of brightness ratio of the first commutation cycle LED
The brightness of period L ED is brighter；In the same manner, the brightness of the 3rd commutation cycle LED is also brighter than the brightness of the second commutation cycle LED, by
This defines visible stroboscopic.
Thus prior art could be improved and improve.
Content of the invention
A kind of in view of in place of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide LED controllable silicon phase controlling
The circuit of light modulator and its elimination stroboscopic, method, by the phase adjusted value of two adjacent commutation cycles of comparison, eliminate strange
Luminance difference during number shaping cycle and even number shaping week, no visible stroboscopic.
In order to achieve the above object, technical scheme below this invention takes：
A kind of LED controllable silicon phase controlled light modulator eliminates the circuit of stroboscopic, and the circuit is connect with LED series winding, the circuit
Including：
Rectification module, for carrying out rectification to have passed through phase-adjusted alternating current, and to LED statements based on collusion electricity；
Energy-storage module, for storing electric energy, and according to the frequent flashing control module that disappears to LED statements based on collusion electricity；
Disappear frequent flashing control module, for the size of the phase adjusted value of two adjacent commutation cycles of comparison；In phase adjusted value
In the big commutation cycle, the ON time of LED string is extended to LED statements based on collusion electricity by energy-storage module, LED string is made in phase
ON time in ON time in the regulated value big commutation cycle of the position commutation cycle little with phase adjusted value is consistent.
Described LED controllable silicon phase controlled light modulator is eliminated in the circuit of stroboscopic, and the output end of the rectification module connects
Connect the input of the frequent flashing control module that disappears and connect the positive pole of LED string by energy-storage module, the negative pole of the LED string connects
Ground, the control end of the output end connection energy-storage module of the frequent flashing control module that disappears.
Described LED controllable silicon phase controlled light modulator is eliminated in the circuit of stroboscopic, and the frequent flashing control module that disappears is concrete
For, the output voltage of real-time detection rectification module, adjacent two commutation cycle is obtained by the output voltage of rectification module
The corresponding regulating time of respective phase adjusted value；The length of the regulating time of two adjacent commutation cycles of comparison, is being adjusted
In the commutation cycle of time length, the ON time of LED string is extended to LED statements based on collusion electricity by energy-storage module, makes LED string
ON time in ON time in the commutation cycle of the regulating time length commutation cycle little with regulating time is consistent.
Described LED controllable silicon phase controlled light modulator is eliminated in the circuit of stroboscopic, and the frequent flashing control module that disappears includes：
Line voltage detector unit, for the output voltage of real-time detection rectification module, and compare the output voltage of rectification module with
The size of threshold voltage, exports the first over-pressed signal to control of discharge list when the output voltage of rectification module is more than threshold voltage
Unit；The second over-pressed signal is exported when the output voltage of rectification module is less than threshold voltage to control of discharge unit；The overvoltage
Signal is periodic signal；
Control of discharge unit, is continuing for the second over-pressed signal for over-pressed signal in two adjacent over-pressed signal periods of comparison
Time；In shorter over-pressed signal period duration of the second over-pressed signal, by controlling energy-storage module to LED statements based on collusion
Electricity, makes the effective time of the input voltage of LED string and the input electricity in the adjacent overvoltage signal period in the over-pressed signal period
The effective time of pressure is consistent.
Described LED controllable silicon phase controlled light modulator is eliminated in the circuit of stroboscopic, and the control of discharge unit includes：
Timer；
Control subelement, for when over-pressed signal is changed into the second over-pressed signal from the first over-pressed signal, resetting simultaneously to timer
When opening timer；In the time of current timer is more than or equal to the previous overvoltage signal period, over-pressed signal is the second mistake
When the duration of pressure signal and now over-pressed signal are for the second overvoltage signal, control energy-storage module is to LED statements based on collusion electricity；It
Afterwards when over-pressed signal is changed into the first over-pressed signal, when control energy-storage module stops to LED statements based on collusion electricity and stops timer,
By rectification module to LED statements based on collusion electricity.
Described LED controllable silicon phase controlled light modulator is eliminated in the circuit of stroboscopic, and the line voltage detector unit includes
First resistor, second resistance, comparator and power supply；One end of the first resistor is the input of line voltage detector unit, even
Connect the output end of rectification module and the input of energy-storage module；The positive input of the other end connection comparator of the first resistor
End is simultaneously grounded by second resistance, and the inverting input of the positive pole connection comparator of the power supply, the negative pole of the power supply connect
Ground, the output end of the comparator are the output end of line voltage detector unit, connect the input of the control of discharge unit.
Described LED controllable silicon phase controlled light modulator is eliminated in the circuit of stroboscopic, the energy-storage module include switch, the
One diode, the second diode and the energy-storage units for energy storage；The input of the just extremely energy-storage module of first diode
End, connects the positive pole of the output end, the input of line voltage detector unit and the second diode of rectification module；One or two pole
The input of the negative pole connection energy-storage units of pipe, the output end of the energy-storage units connect one end of the switch；The switch
The other end for energy-storage module output end, the connection negative pole of the second diode and positive pole of LED string；The control of the switch
The control end for energy-storage module is held, connects the output end of control of discharge unit.
A kind of LED controllable silicon phase controlled light modulator, eliminates including LED controllable silicon phase controlled light modulator as above
The circuit of stroboscopic.
A kind of method that LED controllable silicon phase controlled light modulator eliminates stroboscopic, comprises the steps：
A, rectification module carry out rectification to have passed through phase-adjusted alternating current, and to LED statements based on collusion electricity；
The size of the phase adjusted value of two more adjacent commutation cycles of B, the frequent flashing control module that disappears；Big in phase adjusted value
In commutation cycle, the ON time of LED string is extended to LED statements based on collusion electricity by energy-storage module, so that LED string is adjusted in phase place
ON time in ON time in the section value big commutation cycle commutation cycle little with phase adjusted value is consistent.
Described LED controllable silicon phase controlled light modulator is eliminated in the method for stroboscopic, and step B is specifically included：
Disappear the output voltage of frequent flashing control module real-time detection rectification module, is obtained by the output voltage of rectification module adjacent
The corresponding regulating time of two commutation cycles respective phase adjusted value；The regulating time of two adjacent commutation cycles of comparison
Length, in the commutation cycle of regulating time length, by energy-storage module to LED statements based on collusion electricity come extend LED string conducting when
Between, make ON time of the LED string in the commutation cycle of regulating time length and the conducting in the regulating time little commutation cycle
Time consistency.
Compared to prior art, the present invention provides a kind of LED controllable silicon phase controlled light modulator and its eliminates the electricity of stroboscopic
Road, method, wherein, the circuit includes rectification module, energy-storage module and the frequent flashing control module that disappears.The frequent flashing control module that disappears compares
The size of the phase adjusted value of two adjacent commutation cycles；In the phase adjusted value big commutation cycle, by energy-storage module
Extend the ON time of LED string to LED statements based on collusion electricity, make LED string leading in the phase adjusted value big commutation cycle
ON time in commutation cycle little with phase adjusted value logical time is consistent；I.e. so that LED in two adjacent commutation cycles
The ON time of lamp string is consistent, eliminates stroboscopic.
Description of the drawings
Fig. 1 is in existing LED controllable silicon phase controlled light modulator, line voltage before light modulation, dimmer output voltage, whole
The oscillogram of the electric current of stream bridge output voltage and LED.
Fig. 2 eliminates the circuit diagram of the circuit of stroboscopic for the LED controllable silicon phase controlled light modulator that the present invention is provided.
Fig. 3 is eliminated in the circuit of stroboscopic for the LED controllable silicon phase controlled light modulator that the present invention is provided, and rectification module is exported
The oscillogram of the voltage of voltage, over-pressed signal, the output voltage of control of discharge unit and LED string.
Fig. 4 is eliminated in the circuit of stroboscopic for the LED controllable silicon phase controlled light modulator that the present invention is provided, control of discharge unit
Structured flowchart.
Fig. 5 is eliminated in the circuit of stroboscopic for the LED controllable silicon phase controlled light modulator that the present invention is provided, and line voltage detection is single
The circuit diagram of unit.
Fig. 6 eliminates the method flow diagram of stroboscopic for the LED controllable silicon phase controlled light modulator that the present invention is provided.
Specific embodiment
The present invention provides a kind of LED controllable silicon phase controlled light modulator and its eliminates the circuit of stroboscopic, method.For making this
Bright purpose, technical scheme and effect are clearer, clear and definite, and the embodiment that develops simultaneously referring to the drawings is detailed further to the present invention
Explanation.It should be appreciated that specific embodiment described herein is not intended to limit the present invention only in order to explain the present invention.
The present invention provides the circuit that a kind of LED controllable silicon phase controlled light modulator eliminates stroboscopic, as shown in Fig. 2 the LED
Controllable silicon phase controlled light modulator is eliminated the circuit of stroboscopic and is connected with LED string 40, and the circuit includes rectification module 10, energy storage
Module 30 and the frequent flashing control module 20 that disappears.The input input of the rectification module 10 have passed through phase-adjusted alternating current AC,
The output end of the rectification module 10 connects the input of the frequent flashing control module 20 that disappears and connects LED by energy-storage module 30
The positive pole of string 40, the minus earth of the LED string 40, the output end connection energy-storage module 30 of the frequent flashing control module 20 that disappears
Control end.
The rectification module 10, for carrying out rectification to have passed through phase-adjusted alternating current, and gives 30 He of energy-storage module
LED string 40 is powered.In the present embodiment, the rectification module 10 is rectifier bridge.
The energy-storage module 30, for storing electric energy, and powers to LED string 40 according to the frequent flashing control module 20 that disappears.
The frequent flashing control module 20 that disappears, for the phase adjusted value of the output voltage of real-time detection rectification module, compares
The size of the phase adjusted value of two adjacent commutation cycles；In the phase adjusted value big commutation cycle, by energy-storage module
10 ON times that powers to extend LED string 40 to LED string 40, make LED string 40 in phase adjusted value big rectification week
ON time in the interim ON time commutation cycle little with phase adjusted value is consistent.
Due to stroboscopic be the output voltage of rectification module 10 odd cycle different with the voltage of even cycle cause, tool
Have periodically.Therefore, the operation principle of the frequent flashing control module 20 that disappears can also be retouched by odd cycle and even cycle
State.The i.e. described frequent flashing control module 20 that disappears, for the phase adjusted value of the output voltage of real-time detection rectification module, comparison is adjacent
Two commutation cycles phase adjusted value（θ 1 and θ 2）Size, by control energy-storage module 30 power to LED string 40, make
The lighting time of the LED string 40 of commutation cycle big with phase adjusted value lighting time of LED string 40 is consistent.For changing
It, in the phase adjusted value little commutation cycle, shifts to an earlier date lightening LED lamp string 40 by energy-storage module 30 so that LED in this cycle
The lighting time of lamp string 40 is consistent with the lighting time of the LED string 40 in a upper cycle, as a result, in each commutation cycle
The ON time of LED string is all identical, eliminates stroboscopic.Specifically, the frequent flashing control module 20 that disappears is in the odd number commutation cycle
Phase adjusted value more than the even number commutation cycle phase adjusted value when, in the current and/or follow-up odd number commutation cycle lead to
Cross control energy-storage module 30 to power to LED string 40, make the effective time of the input voltage of LED string 40 in the odd number commutation cycle
（That is lighting time）Consistent with the effective time of the input voltage of LED string 40 in the even number commutation cycle；In the even number commutation cycle
Phase adjusted value more than the odd number commutation cycle phase adjusted value when, in the current and/or follow-up even number commutation cycle lead to
Cross control energy-storage module 30 to power to LED string 40, make the effective time of the input voltage of LED string 40 in the even number commutation cycle
Consistent with the effective time of the input voltage of LED string 40 in the odd number commutation cycle.Two adjacent commutation cycles, permissible
Be the previous commutation cycle with current collation cycle, or the first two commutation cycle, the present embodiment is for the former.That is, described
When the phase adjusted value of the frequent flashing control module that disappears more previous commutation cycle is more than the phase adjusted value of current commutation cycle, working as
Powered to LED string 40 by controlling energy-storage module 30 in the front commutation cycle, make the defeated of LED string 40 in the current commutation cycle
Enter the effective time of voltage（That is lighting time）Effective time one with the input voltage of LED string 40 in the previous commutation cycle
Cause；Or, two more adjacent commutation cycles of the frequent flashing control module that disappears, draw odd number commutation cycle or even number rectification
The phase adjusted value in cycle is big, in follow-up all commutation cycles, all phase adjusted value big odd number commutation cycle or
The even number commutation cycle is all powered to LED string 40 by controlling energy-storage module 30, makes the defeated of LED string 40 in the current commutation cycle
Enter the effective time of voltage（That is lighting time）Effective time one with the input voltage of LED string 40 in the previous commutation cycle
Cause.The input voltage effective time in one cycle of LED string 40 refer to input voltage more than threshold voltage vt h total when
Between.
The phase adjusted value of the output voltage of the 20 real-time detection rectification module 10 of frequent flashing control module that disappears, comparison are adjacent
Two commutation cycles phase adjusted value size；Specially：Two adjacent commutation cycles of real-time detection respective phase place
The corresponding regulating time of regulated value, the size of the regulating time of two adjacent commutation cycles of comparison.The phase adjusted value pair
The regulating time that answers, just refers in Fig. 3, θ 1 and the corresponding time period of θ 2.In other words, the frequent flashing control module 20 that disappears is concrete
For, the output voltage of real-time detection rectification module 10, adjacent two rectification is obtained by the output voltage of rectification module 10
The corresponding regulating time of cycle respective phase adjusted value；The length of the regulating time of two adjacent commutation cycles of comparison,
In the commutation cycle of regulating time length, during the conducting that is powered to extend LED string 40 to LED string 40 by energy-storage module 30
Between, leading in the commutation cycle for making ON time of the LED string 40 in the commutation cycle of regulating time length little with regulating time
Logical time consistency.The present invention indirectly represents phase adjusted value with the time, and the time is more readily detected, and therefore improves regulation
Accuracy.
Further, the frequent flashing control module 20 that disappears includes line voltage detector unit 210 and control of discharge unit 220.
The input of the line voltage detector unit 210 is to disappear the input of frequent flashing control module 20, connects the output of rectification module 10
End, the input of the output end connection control of discharge unit 220 of the line voltage detector unit 210, the control of discharge unit
The control end of 220 output end connection energy-storage module.
In the embodiment that the present invention is provided, the line voltage detector unit 210, for the defeated of real-time detection rectification module 10
Go out voltage Vac, and compare the size of the output voltage Vac and threshold voltage vt h of rectification module 10, in the output of rectification module 10
The first over-pressed signal is exported when voltage Vac is more than threshold voltage vt h to control of discharge unit 220；Output in rectification module 10
The second over-pressed signal is exported when voltage Vac is less than threshold voltage vt h to control of discharge unit 220；Because rectification module 10 is defeated
It is periodic to go out voltage Vac, and its cycle is T, therefore the overvoltage signal OVH is also periodic signal, is specifically believed by the first overvoltage
Number and the second over-pressed signal composition, its cycle is similarly T.Described first over-pressed signal is high level or low level, the second overvoltage
Signal is low level or high level, and the first over-pressed signal is different from the second over-pressed signal.In the present embodiment, the first overvoltage letter
Number it is high level, the second over-pressed signal is low level.The threshold voltage vt h is less than the corresponding voltage of phase adjusted value,
And the conducting voltage more than or equal to LED string 40, it is preferred that the threshold voltage vt h is the conducting voltage of LED string 40.By
This, can judge according to the size of the output voltage Vac for judging rectification module 10 and threshold voltage vt h LED string 40 whether
Light.
The control of discharge unit 220, is the second mistake for over-pressed signal in two adjacent over-pressed signal periods of comparison
The duration of pressure signal；In shorter over-pressed signal period duration of the second over-pressed signal, by control energy storage mould
Block 30 is powered to LED string 40, makes the effective time of the input voltage of LED string 40 and adjacent overvoltage in the over-pressed signal period
The effective time of the input voltage in the signal period is consistent.In other words, the control of discharge unit 220 is adjacent for comparison
Two over-pressed signal periods in over-pressed signal be the second over-pressed signal duration；Overvoltage in the odd number overvoltage signal period
It is holding for the second over-pressed signal that signal is the over-pressed signal for the duration of the second over-pressed signal being more than the even number overvoltage signal period
During the continuous time, energy-storage module 30 is controlled to power to LED string 40 in the current and/or follow-up odd number overvoltage signal period, it
Afterwards when the overvoltage signal is changed into the first over-pressed signal from the second over-pressed signal, stops energy-storage module 30 and supply to LED string 40
Electricity（Energy-storage module 30 is closed）, powered to LED string 40 by rectification module 10, make LED string in the odd number overvoltage signal period
The effective time of 40 input voltage is consistent with the effective time of the input voltage of LED string in the even number overvoltage signal period；With
And the duration that the over-pressed signal in the even number overvoltage signal period is the second over-pressed signal is more than the odd number overvoltage signal period
When over-pressed signal is the duration of the second over-pressed signal, by storage in the current and/or follow-up even number overvoltage signal period
Energy module 30 is powered to LED string 40, afterwards when the overvoltage signal is changed into the first over-pressed signal from the second over-pressed signal, is stopped
Only energy-storage module 30 is powered to LED string 40（Energy-storage module 30 is closed）, powered to LED string 40 by rectification module 10, make
In the even number overvoltage signal period in effective time and the odd number of the input voltage of the LED string over-pressed signal period LED string defeated
The effective time for entering voltage is consistent.
Further, Fig. 4 is referred to, the control of discharge unit 220 includes timer 221 and control subelement 222.Institute
The input for stating control subelement 222 is the input of control of discharge unit 220, the output end of connecting line voltage detection unit,
The control end of the output end connection energy-storage module 30 of the control subelement 222, the control subelement 222 are also connected with the meter
When device 221.
The control subelement 222, for when over-pressed signal OVH is changed into the second over-pressed signal from the first over-pressed signal,
When resetting and open timer to timer 221；The first over-pressed signal is changed into from the second over-pressed signal in over-pressed signal and works as
When the time of front timer 221 is less than the duration that over-pressed signal in the previous overvoltage signal period is the second over-pressed signal, by
Rectification module 10 is powered to LED string 40, makes energy-storage module 30 close output；It is more than or equal in the time of current timer
In the previous overvoltage signal period over-pressed signal be the second over-pressed signal duration and now over-pressed signal be the second overvoltage letter
Number when, control energy-storage module 30 is powered to LED string 40, afterwards when over-pressed signal OVH is changed into the first over-pressed signal, control storage
Energy module 30 stops powering and stopping 221 timing of timer to LED string 40 and record clocking value, gives LED by rectification module 10
Lamp string 40 is powered；When over-pressed signal is changed into the first over-pressed signal from the second over-pressed signal, stops 221 timing of timer and record
Clocking value, when timer duration is less than the clocking value of previous periodic recording, does not trigger electric discharge and enables, all the time by rectification module 10
Power to LED string 40.The control subelement 222 is made up of memory and CL Compare Logic circuit.
It can thus be appreciated that when the present invention is using timer, when can achieve the conducting of LED string by simple logic control
Between change, so as to eliminate stroboscopic, simple structure low cost, applied widely.
Fig. 5 is referred to, in the first embodiment, the line voltage detector unit 210 includes first resistor R1, second resistance
R2, comparator Q1 and power supply V1；One end of first resistor R1 is the input of line voltage detector unit 210, connects rectification
The output end of module 10 and the input of energy-storage module 30, the positive of the other end connection comparator Q1 of first resistor R1 are defeated
Enter end and be grounded by second resistance R2, the inverting input of the positive pole connection comparator Q1 of the power supply V1, the power supply V1
Minus earth, the output end of the comparator Q1 for line voltage detector unit 210 output end, connect the control of discharge list
The input of unit 220.The voltage of the power supply V1 is exactly threshold voltage vt h.Certainly, in a second embodiment, the power supply V1
Positive pole connection comparator Q1 normal phase input end, the first resistor the other end connection comparator Q1 inverting input,
I.e. comparator Q1 is contrary with the connection of first embodiment.
Please continue to refer to Fig. 2, described LED controllable silicon phase controlled light modulator is eliminated in the circuit of stroboscopic, the energy storage
Module 30 includes to switch K, the first diode D1, the second diode D2 and the energy-storage units 310 for energy storage；One or two pole
The input of the just extremely energy-storage module 30 of pipe D1, connects output end, the input of line voltage detector unit 210 of rectification module 10
End and the positive pole of the second diode D2；The input of the negative pole connection energy-storage units 310 of the first diode D1, the energy storage
The output end of unit 310 connects one end of the switch K；The other end of the switch K is the output end of energy-storage module 30, connection
The negative pole of the second diode D2 and the positive pole of LED string 40；The control end of the switch K is the control end of energy-storage module 30, even
Connect the output end of control of discharge unit 220.It follows that control of discharge unit 220 only needs the break-make of controlling switch K to can achieve
The release of 310 energy of energy-storage units is easy to control quick.
The switch K can be digital switch, or switching tube（Metal-oxide-semiconductor）.The energy-storage units 310 are preferably electricity
Hold；One end of the electric capacity is the input of energy-storage units 310, connects the negative pole of the first diode D1；The electric capacity another
Hold the output end for energy-storage units 310, one end of connecting valve K.It follows that the present invention is by cleverly circuit design, knot
Structure is simple, eliminates stroboscopic.
Described LED controllable silicon phase controlled light modulator eliminates the circuit of stroboscopic also includes constant flow module I, the constant current mould
Block I is used for carrying out LED string 40 constant current driving, and the LED string 40 is by the constant flow module I ground connection.
The principle of the present invention preferably can be illustrated with reference to Fig. 3, in the first embodiment, it is known that the commutation cycle is T,
Vac drops to the time Toffset of 0V from Vth, from the property of trigonometric function：
(t1-Toffset)/1/180 ° of T=θ, 2/180 ° of (t2-Toffset)/T=θ；Therefore the calculating to angle can be converted into
Calculating to the time.Wherein, t1 and t2 are that over-pressed signal OVH is low level lasting in adjacent two overvoltage signal period T
Time, t2 ＞ t1；θ 1 and θ 2 is adjacent two over-pressed signal periods（Commutation cycle）In phase adjusted value.
Comparator Q1 detection rectifier bridge output voltage Vac is high electricity more than the over-pressed signal OVH that threshold voltage vt h is then exported
Flat, it is otherwise low level.It is to be respectively the low time that control of discharge unit 220 measures the OVH of two neighboring overvoltage signal period
T1 and t2.Control of discharge unit 220 compares this cycle OVH when be the low time for having maintained with previous cycle OVH being low total
Between, if both are equal, and when OVH is not high, the discharge switch of control of discharge unit 220 enables signal enable（Electric discharge
The output voltage of control unit）High level is output as, turns on switch K, the electric discharge of energy-storage module 30 shifts to an earlier date lightening LED lamp string, such as
A section in Fig. 3 in the voltage waveform of LED string.When OVH for high when, the enable signal output of control of discharge unit
For low level, disconnect switch K, by Vac to LED statements based on collusion electricity, the T1 cycle of such as Fig. 3；Otherwise, control of discharge unit
Enable signal remains low level, by Vac to LED statements based on collusion electricity, the T2 cycle of such as Fig. 3.So so that former and later two cycles
Time for lighting of lamp string equal.By taking the second overvoltage signal period T2 as an example, control of discharge unit 220 compares this cycle OVH and is
The overvoltage signal period OVH of the low time t1 for having maintained and first is that low total time t2, t1 are both less than t2, control of discharge always
The enable signal of unit remains low level, by Vac to LED statements based on collusion electricity.After the 3rd overvoltage signal period T3 is entered, put
Electric control unit 220 compare this cycle OVH to be the overvoltage signal period OVH of the low time t2 for having maintained and second when being low total
Between t1, in t2=t1 and OVH for high when, the discharge switch of control of discharge unit 220 enables signal enable（Control of discharge
The output voltage of unit）High level is output as, turns on switch K, the electric discharge of energy-storage module 30 shifts to an earlier date lightening LED lamp string, in such as Fig. 3
A section in the voltage waveform of LED string.When OVH for high when, the enable signal output of control of discharge unit is low electricity
Flat, disconnect switch K, by VAC to LED statements based on collusion electricity.
When phase controlled light modulator dims LED, i.e., control phase theta becomes big, and this circuit needs to postpone 1 commutation cycle
Respond, but the time of 1 commutation cycle will not be caught by human eye；When phase controlled light modulator lightens LED, that is, control phase
Position θ diminishes, and the system can make an immediate response, and therefore not interfere with dimming effect.
The circuit of stroboscopic is eliminated based on the LED controllable silicon phase controlled light modulator in above-described embodiment, and the present invention is also provided
A kind of LED controllable silicon phase controlled light modulator, the light modulator include pcb board, are provided with above-mentioned elimination frequency on the pcb board
The circuit of sudden strain of a muscle.As the concrete principle of the LED controllable silicon phase controlled light modulator and detail technical features are in above-described embodiment
In elaborate, will not be described here.
Based on the LED controllable silicon phase controlled light modulator in above-described embodiment and its circuit of elimination stroboscopic, the present invention is also
A kind of method that LED controllable silicon phase controlled light modulator eliminates stroboscopic is provided, Fig. 6 is referred to, methods described comprises the steps：
S10, rectification module carry out rectification to have passed through phase-adjusted alternating current, and to LED statements based on collusion electricity；
The size of the phase adjusted value of two more adjacent commutation cycles of S20, the frequent flashing control module that disappears；Big in phase adjusted value
Commutation cycle in, by energy-storage module to LED statements based on collusion electricity extending the ON time of LED string, make LED string in phase place
ON time in ON time in the regulated value big commutation cycle commutation cycle little with phase adjusted value is consistent.
Further, described LED controllable silicon phase controlled light modulator is eliminated in the method for stroboscopic, the step S20 tool
Body includes：
Disappear the output voltage of frequent flashing control module real-time detection rectification module, is obtained by the output voltage of rectification module adjacent
The corresponding regulating time of two commutation cycles respective phase adjusted value；The regulating time of two adjacent commutation cycles of comparison
Length, in the commutation cycle of regulating time length, by energy-storage module to LED statements based on collusion electricity come extend LED string conducting when
Between, make ON time of the LED string in the commutation cycle of regulating time length and the conducting in the regulating time little commutation cycle
Time consistency.
Described LED controllable silicon phase controlled light modulator is eliminated in the method for stroboscopic, and the frequent flashing control module that disappears includes
Line voltage detector unit and control of discharge unit；Step S20 specifically includes following steps：
210th, the output voltage of line voltage detector unit real-time detection rectification module, and compare output voltage and the threshold of rectification module
The size of threshold voltage, exports the first over-pressed signal to control of discharge list when the output voltage of rectification module is more than threshold voltage
Unit；The second over-pressed signal is exported when the output voltage of rectification module is less than threshold voltage to control of discharge unit；The overvoltage
Signal is periodic signal；
220th, in two more adjacent over-pressed signal periods of control of discharge unit, over-pressed signal is continuing for the second over-pressed signal
Time；In shorter over-pressed signal period duration of the second over-pressed signal, by controlling energy-storage module to LED statements based on collusion
Electricity, makes the effective time of the input voltage of LED string and the input electricity in the adjacent overvoltage signal period in the over-pressed signal period
The effective time of pressure is consistent.
Further, the control of discharge unit includes timer and control subelement, and the step 220 is specifically wrapped
Include：Control subelement when over-pressed signal is changed into the second over-pressed signal from the first over-pressed signal, when opening timer；Current
The time of timer more than or equal to the duration that over-pressed signal in the previous overvoltage signal period is the second over-pressed signal and this
When over-pressed signal when being the second over-pressed signal, control energy-storage module is to LED statements based on collusion electricity；It is changed into the first mistake in over-pressed signal afterwards
During pressure signal, when control energy-storage module stops to LED statements based on collusion electricity and stops timer.
As the LED controllable silicon phase controlled light modulator eliminates the concrete principle of the method for stroboscopic and detail technical features
Elaborate in the above-described embodiments, will not be described here.
The division of above-mentioned functions module only in order to illustrate, in actual applications, can be as needed by above-mentioned functions
Distribution is completed by different functional modules, that is, be divided into different functional modules, complete all or part of foregoing description
Function.
It is understood that for those of ordinary skills, with technology according to the present invention scheme and its can send out
Bright design in addition equivalent or change, and all these changes or replace the guarantor that should all belong to appended claims of the invention
Shield scope.
Claims (10)
1. a kind of LED controllable silicon phase controlled light modulator eliminates the circuit of stroboscopic, and the circuit is connect with LED series winding, its feature
It is, the circuit includes：
Rectification module, for carrying out rectification to have passed through phase-adjusted alternating current, and to LED statements based on collusion electricity；
Energy-storage module, for storing electric energy, and according to the frequent flashing control module that disappears to LED statements based on collusion electricity；
Disappear frequent flashing control module, for the size of the phase adjusted value of two adjacent commutation cycles of comparison；In phase adjusted value
In the big commutation cycle, the ON time of LED string is extended to LED statements based on collusion electricity by energy-storage module, LED string is made in phase
ON time in ON time in the regulated value big commutation cycle of the position commutation cycle little with phase adjusted value is consistent.
2. LED controllable silicon phase controlled light modulator according to claim 1 eliminates the circuit of stroboscopic, it is characterised in that institute
The output end for stating rectification module is connected the input of the frequent flashing control module that disappears and is connected the positive pole of LED string by energy-storage module,
The minus earth of the LED string, the control end of the output end connection energy-storage module of the frequent flashing control module that disappears.
3. LED controllable silicon phase controlled light modulator according to claim 1 and 2 eliminates the circuit of stroboscopic, it is characterised in that
The frequent flashing control module that disappears is specifically for the output voltage of real-time detection rectification module, by the output voltage of rectification module
Obtain the corresponding regulating time of adjacent two commutation cycle respective phase adjusted value；Two adjacent commutation cycles of comparison
The length of regulating time, in the commutation cycle of regulating time length, extends LED by energy-storage module to LED statements based on collusion electricity
The ON time of string, the rectification week for making ON time of the LED string in the commutation cycle of regulating time length little with regulating time
Interim ON time is consistent.
4. LED controllable silicon phase controlled light modulator according to claim 3 eliminates the circuit of stroboscopic, it is characterised in that institute
Stating the frequent flashing control module that disappears includes：
Line voltage detector unit, for the output voltage of real-time detection rectification module, and compare the output voltage of rectification module with
The size of threshold voltage, exports the first over-pressed signal to control of discharge list when the output voltage of rectification module is more than threshold voltage
Unit；The second over-pressed signal is exported when the output voltage of rectification module is less than threshold voltage to control of discharge unit；The overvoltage
Signal is periodic signal；
Control of discharge unit, is continuing for the second over-pressed signal for over-pressed signal in two adjacent over-pressed signal periods of comparison
Time；In shorter over-pressed signal period duration of the second over-pressed signal, by controlling energy-storage module to LED statements based on collusion
Electricity, makes the effective time of the input voltage of LED string and the input electricity in the adjacent overvoltage signal period in the over-pressed signal period
The effective time of pressure is consistent.
5. LED controllable silicon phase controlled light modulator according to claim 4 eliminates the circuit of stroboscopic, it is characterised in that institute
Stating control of discharge unit includes：
Timer；
Control subelement, for when over-pressed signal is changed into the second over-pressed signal from the first over-pressed signal, resetting simultaneously to timer
When opening timer；In the time of current timer is more than or equal to the previous overvoltage signal period, over-pressed signal is the second mistake
When the duration of pressure signal and now over-pressed signal are for the second overvoltage signal, control energy-storage module is to LED statements based on collusion electricity；It
Afterwards when over-pressed signal is changed into the first over-pressed signal, when control energy-storage module stops to LED statements based on collusion electricity and stops timer,
By rectification module to LED statements based on collusion electricity.
6. LED controllable silicon phase controlled light modulator according to claim 4 eliminates the circuit of stroboscopic, it is characterised in that institute
Stating line voltage detector unit includes first resistor, second resistance, comparator and power supply；One end of the first resistor is line voltage
The input of detector unit, the connection output end of rectification module and the input of energy-storage module；The other end of the first resistor
The normal phase input end of connection comparator is simultaneously grounded by second resistance, the anti-phase input of the positive pole connection comparator of the power supply
End, the minus earth of the power supply, the output end of the comparator are the output end of line voltage detector unit, connect the electric discharge
The input of control unit.
7. LED controllable silicon phase controlled light modulator according to claim 4 eliminates the circuit of stroboscopic, it is characterised in that institute
Stating energy-storage module includes switch, the first diode, the second diode and the energy-storage units for energy storage；First diode
The input of just extremely energy-storage module, connects output end, the input of line voltage detector unit and the two or two pole of rectification module
The positive pole of pipe；The input of the negative pole connection energy-storage units of first diode, the output end connection institute of the energy-storage units
State one end of switch；The other end of the switch is the output end of energy-storage module, connects negative pole and the LED string of the second diode
Positive pole；The control end of the switch is the control end of energy-storage module, connects the output end of control of discharge unit.
8. a kind of LED controllable silicon phase controlled light modulator, it is characterised in that include as described in claim 1-7 any one
LED controllable silicon phase controlled light modulator eliminates the circuit of stroboscopic.
9. a kind of method that LED controllable silicon phase controlled light modulator eliminates stroboscopic, it is characterised in that comprise the steps：
A, rectification module carry out rectification to have passed through phase-adjusted alternating current, and to LED statements based on collusion electricity；
The size of the phase adjusted value of two more adjacent commutation cycles of B, the frequent flashing control module that disappears；Big in phase adjusted value
In commutation cycle, the ON time of LED string is extended to LED statements based on collusion electricity by energy-storage module, so that LED string is adjusted in phase place
ON time in ON time in the section value big commutation cycle commutation cycle little with phase adjusted value is consistent.
10. the method that LED controllable silicon phase controlled light modulator according to claim 9 eliminates stroboscopic, it is characterised in that institute
State step B to specifically include：
Disappear the output voltage of frequent flashing control module real-time detection rectification module, is obtained by the output voltage of rectification module adjacent
The corresponding regulating time of two commutation cycles respective phase adjusted value；The regulating time of two adjacent commutation cycles of comparison
Length, in the commutation cycle of regulating time length, by energy-storage module to LED statements based on collusion electricity come extend LED string conducting when
Between, make ON time of the LED string in the commutation cycle of regulating time length and the conducting in the regulating time little commutation cycle
Time consistency.
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| CN109587880A (en) * | 2018-12-18 | 2019-04-05 | 陕西亚成微电子股份有限公司 | A kind of controllable silicon light modulation LED driving method and circuit |
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