CN106488611B - The circuit of LED controllable silicons phase controlled light modulator and its elimination stroboscopic, method - Google Patents
The circuit of LED controllable silicons phase controlled light modulator and its elimination stroboscopic, method Download PDFInfo
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- CN106488611B CN106488611B CN201610989861.6A CN201610989861A CN106488611B CN 106488611 B CN106488611 B CN 106488611B CN 201610989861 A CN201610989861 A CN 201610989861A CN 106488611 B CN106488611 B CN 106488611B
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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 LED controllable silicons phase controlled light modulator and its circuit of stroboscopic, method are eliminated, 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, electricity is acted in collusion to make each other's confessions to extend the ON time of LED string to LED by energy-storage module, makes ON time of the LED string in the phase adjusted value big commutation cycle consistent with the ON time in the commutation cycle that phase adjusted value is small；I.e. so that the ON time of LED string is consistent in two adjacent commutation cycles, eliminates stroboscopic.
Description
Technical field
The present invention relates to field of LED illumination, more particularly to a kind of LED controllable silicons phase controlled light modulator and its elimination stroboscopic
Circuit, method.
Background technology
In the prior art, the phase controlled light modulator realized using bidirectional triode thyristor, due to the forward direction of bidirectional triode thyristor
Trigger current is different from reverse trigger current, causes the phase of the positive regulation of phase controlled light modulator output and the phase reversely adjusted
Position is inconsistent；The regulation phase that odd cycle and even cycle are converted into after rectifier bridge is inconsistent；Finally it is embodied in LED
On be odd cycle and even cycle brightness it is inconsistent, i.e. LED can flash, and frequency is consistent with line voltage, usually 50hz, can
See stroboscopic.
As shown in figure 1, it is θ 1 that forward direction, which controls phase, Reverse Turning Control phase is θ 2, it is assumed that θ 1<θ 2, the first commutation cycle LED
The time lighted is longer than the time that the second commutation cycle LED is lighted, so the first commutation cycle LED rectification of brightness ratio second
Period L ED brightness is brighter；Similarly, brightness of the 3rd commutation cycle LED brightness also than the second commutation cycle LED is brighter, by
This forms visible stroboscopic.
Thus prior art could be improved and improve.
The content of the invention
In view of in place of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of LED controllable silicons phase controlling
The circuit of light modulator and its elimination stroboscopic, method, by the phase adjusted value of two more adjacent commutation cycles, eliminate strange
Luminance difference during number shaping cycle and even number shaping week, without visible stroboscopic.
In order to achieve the above object, this invention takes following technical scheme：
A kind of LED controllable silicons phase controlled light modulator eliminates the circuit of stroboscopic, and the circuit connects with LED series winding, described
Circuit includes：
Rectification module, for carrying out rectification to have passed through phase-adjusted alternating current, and give LED statements based on collusion electricity；
Energy-storage module, LED statements based on collusion electricity is given for storing electric energy, and according to the frequent flashing control module that disappears；
Disappear frequent flashing control module, the size for the phase adjusted value of two more adjacent commutation cycles；Adjusted in phase
In the section value big commutation cycle, electricity is acted in collusion to make each other's confessions to extend the ON time of LED string to LED by energy-storage module, makes LED string
ON time in the phase adjusted value big commutation cycle is consistent with the ON time in the commutation cycle that phase adjusted value is small.
Described LED controllable silicons phase controlled light modulator is eliminated in the circuit of stroboscopic, and the output end of the rectification module connects
Connect the input for the frequent flashing control module that disappears and the positive pole of LED string is connected by energy-storage module, the negative pole of the LED string connects
Ground, the control terminal of the output end connection energy-storage module of the frequent flashing control module that disappears.
Described LED controllable silicons phase controlled light modulator is eliminated in the circuit of stroboscopic, and the frequent flashing control module that disappears is specific
For detecting the output voltage of rectification module in real time, two adjacent commutation cycles being obtained by the output voltage of rectification module
Regulating time corresponding to respective phase adjusted value；The length of the regulating time of two more adjacent commutation cycles, is being adjusted
In the commutation cycle of time length, electricity is acted in collusion to make each other's confessions to extend the ON time of LED string to LED by energy-storage module, makes LED string
ON time in the commutation cycle of regulating time length is consistent with the ON time in the commutation cycle that regulating time is small.
Described LED controllable silicons phase controlled light modulator is eliminated in the circuit of stroboscopic, and the frequent flashing control module that disappears includes：
Line voltage detection unit, for detecting the output voltage of rectification module in real time, and compare the output electricity of rectification module
Pressure and the size of threshold voltage, the first over-pressed signal is exported when the output voltage of rectification module is more than threshold voltage and is controlled to electric discharge
Unit processed；The second over-pressed signal is exported when the output voltage of rectification module is less than threshold voltage and gives control of discharge unit；It is described
Over-pressed signal is periodic signal；
Control of discharge unit, it is the second over-pressed signal for over-pressed signal in two more adjacent over-pressed signal periods
Duration；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, make in the over-pressed signal period effective time of the input voltage of LED string with it is defeated in the adjacent over-pressed signal period
The effective time for entering voltage is consistent.
Described LED controllable silicons phase controlled light modulator is eliminated in the circuit of stroboscopic, and the control of discharge unit includes：
Timer；
Subelement is controlled, it is clear to timer for when over-pressed signal is changed into the second over-pressed signal from the first over-pressed signal
Zero and when opening timer；It is the to be more than or equal to over-pressed signal in the previous over-pressed signal period in the time of current timer
When the duration of two over-pressed signals and now over-pressed signal are the second over-pressed signal, control energy-storage module is acted in collusion to make each other's confessions to LED
Electricity；Afterwards when over-pressed signal is changed into the first over-pressed signal, control energy-storage module stops to LED statements based on collusion electricity and stops timer
Timing, LED statements based on collusion electricity is given by rectification module.
Described LED controllable silicons phase controlled light modulator is eliminated in the circuit of stroboscopic, and the line voltage detection unit includes
First resistor, second resistance, comparator and power supply；One end of the first resistor is the input of line voltage detection 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
Hold and be grounded by second resistance, the inverting input of the positive pole connection comparator of the power supply, the negative pole of the power supply connects
Ground, the output end of the comparator is the output end of line voltage detection unit, the input of the connection control of discharge unit.
Described LED controllable silicons phase controlled light modulator is eliminated in the circuit of stroboscopic, and the energy-storage module includes switch, the
One diode, the second diode and the energy-storage units for energy storage；The just extremely input of energy-storage module of first diode
End, connect the positive pole of the output end of rectification module, the input of line voltage detection unit and the second diode；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 be energy-storage module output end, connect the second diode negative pole and LED string positive pole；The control of the switch
The control terminal for energy-storage module is held, connects the output end of control of discharge unit.
A kind of LED controllable silicons phase controlled light modulator, including LED controllable silicons phase controlled light modulator as described above eliminate
The circuit of stroboscopic.
A kind of method that LED controllable silicons phase controlled light modulator eliminates stroboscopic, comprises the following steps：
A, rectification module carries out rectification to have passed through phase-adjusted alternating current, and gives LED statements based on collusion electricity；
B, the size of the phase adjusted value of two more adjacent commutation cycles of the frequent flashing control module that disappears；In phase adjusted value
In the big commutation cycle, electricity is acted in collusion to make each other's confessions to extend the ON time of LED string to LED by energy-storage module, makes LED string in phase
ON time in the position regulated value big commutation cycle is consistent with the ON time in the commutation cycle that phase adjusted value is small.
Described LED controllable silicons phase controlled light modulator is eliminated in the method for stroboscopic, and the step B is specifically included：
The frequent flashing control module that disappears detects the output voltage of rectification module in real time, and phase is obtained by the output voltage of rectification module
Regulating time corresponding to two adjacent commutation cycle respective phase adjusted values；During the regulation of two more adjacent commutation cycles
Between length, in the commutation cycle of regulating time length, leading for LED string is extended to LED electricity of acting in collusion to make each other's confessions by energy-storage module
The logical time, make in ON time of the LED string in the commutation cycle that regulating time is grown and regulating time small commutation cycle
ON time is consistent.
Compared to prior art, the present invention provides a kind of LED controllable silicons 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, pass through energy-storage module
Electricity is acted in collusion to make each other's confessions to extend the ON time of LED string to LED, makes LED string leading in the phase adjusted value big commutation cycle
The logical time is consistent with the ON time in the commutation cycle that phase adjusted value is small；I.e. so that LED in two adjacent commutation cycles
The ON time of lamp string is consistent, eliminates stroboscopic.
Brief description of the drawings
Fig. 1 is in existing LED controllable silicons phase controlled light modulator, line voltage, dimmer output voltage before light modulation, whole
Flow the oscillogram of bridge output voltage and the electric current of LED.
Fig. 2 is the circuit diagram for the circuit that LED controllable silicons phase controlled light modulator provided by the invention eliminates stroboscopic.
Fig. 3 is rectification module output in the circuit that LED controllable silicons phase controlled light modulator provided by the invention eliminates stroboscopic
Voltage, over-pressed signal, the output voltage of control of discharge unit and LED string voltage oscillogram.
Fig. 4 is control of discharge unit in the circuit that LED controllable silicons phase controlled light modulator provided by the invention eliminates stroboscopic
Structured flowchart.
Fig. 5 is in the circuit that LED controllable silicons phase controlled light modulator provided by the invention eliminates stroboscopic, and line voltage detection is single
The circuit diagram of member.
Fig. 6 is the method flow diagram that LED controllable silicons phase controlled light modulator provided by the invention eliminates stroboscopic.
Embodiment
The present invention provides a kind of LED controllable silicons phase controlled light modulator and its eliminates the circuit of stroboscopic, method.To make this hair
Bright purpose, technical scheme and effect are clearer, clear and definite, and the embodiment that develops simultaneously referring to the drawings is to of the invention further detailed
Explanation.It should be appreciated that specific embodiment described herein is not intended to limit the present invention only to explain the present invention.
The present invention provides the circuit that a kind of LED controllable silicons phase controlled light modulator eliminates stroboscopic, as shown in Fig. 2 the LED
The circuit that controllable silicon phase controlled light modulator eliminates stroboscopic 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 for the frequent flashing control module 20 that disappears and connects LED by energy-storage module 30
The positive pole of string 40, the negative pole ground connection of the LED string 40, the output end connection energy-storage module 30 of the frequent flashing control module 20 that disappears
Control terminal.
The rectification module 10, for carrying out rectification to have passed through phase-adjusted alternating current, and give the He of energy-storage module 30
LED string 40 is powered.In the present embodiment, the rectification module 10 is rectifier bridge.
The energy-storage module 30, powered for storing electric energy, and according to the frequent flashing control module 20 that disappears to LED string 40.
The frequent flashing control module 20 that disappears, the phase adjusted value of the output voltage for detecting rectification module in real time, compares
The size of the phase adjusted value of two adjacent commutation cycles；In the phase adjusted value big commutation cycle, pass through energy-storage module
10 power to LED string 40 to extend the ON time of LED string 40, make LED string 40 in phase adjusted value big rectification week
Interim ON time is consistent with the ON time in the commutation cycle that phase adjusted value is small.
Due to stroboscopic be the output voltage of rectification module 10 odd cycle with caused by the voltage difference of even cycle, 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, the phase adjusted value of the output voltage for detecting rectification module in real time are more adjacent
Two commutation cycles phase adjusted value（θ 1 and θ 2）Size, by controlling energy-storage module 30 to be powered to LED string 40, make
The lighting time of LED string 40 is consistent with the lighting time of the LED string 40 for the commutation cycle that phase adjusted value is big.For changing
It, in the phase adjusted value small commutation cycle, shifts to an earlier date lightening LED lamp string 40 so that LED in this cycle by energy-storage module 30
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 be 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）It is 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 be 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
It is consistent with the effective time of the input voltage of LED string 40 in the odd number commutation cycle.Two adjacent commutation cycles, can be with
It it is previous commutation cycle and current collation cycle or the first two commutation cycle, the present embodiment is for the former.That is, it 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
By controlling energy-storage module 30 to be powered to LED string 40 in the preceding commutation cycle, make the defeated of LED string 40 in the current commutation cycle
Enter the effective time of voltage（That is lighting time）With the effective time one of the input voltage of LED string 40 in the previous commutation cycle
Cause；Or two commutation cycles that the frequent flashing control module that disappears is more adjacent, 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 values big odd number commutation cycle or
The even number commutation cycle by controlling energy-storage module 30 to be powered to LED string 40, makes the defeated of LED string 40 in the current commutation cycle
Enter the effective time of voltage（That is lighting time）With the effective time one of the input voltage of LED string 40 in the previous commutation cycle
Cause.The input voltage effective time of LED string 40 in one cycle refer to input voltage more than threshold voltage vt h it is total when
Between.
The frequent flashing control module 20 that disappears detects the phase adjusted value of the output voltage of rectification module 10 in real time, more adjacent
Two commutation cycles phase adjusted value size；Specially：Two adjacent commutation cycle respective phases are detected in real time
Regulating time corresponding to regulated value, the size of the regulating time of more adjacent two commutation cycles.The phase adjusted value pair
The regulating time answered, just refers in Fig. 3, the period corresponding to θ 1 and θ 2.In other words, the frequent flashing control module 20 that disappears is specific
For detecting the output voltage of rectification module 10 in real time, two adjacent rectifications being obtained by the output voltage of rectification module 10
Regulating time corresponding to cycle respective phase adjusted value；The length of the regulating time of two more adjacent commutation cycles,
In the commutation cycle of regulating time length, when being powered by energy-storage module 30 to LED string 40 to extend the conducting of LED string 40
Between, make leading in ON time of the LED string 40 in the commutation cycle that regulating time the is grown commutation cycle small with regulating time
Logical time consistency.The present invention indirectly represents phase adjusted value with the time, and the time is more readily detected, therefore improves regulation
Accuracy.
Further, the frequent flashing control module 20 that disappears includes line voltage detection unit 210 and control of discharge unit 220.
The input of the line voltage detection unit 210 is the input of frequent flashing control module 20 of disappearing, and connects the output of rectification module 10
End, the input of the output end connection control of discharge unit 220 of the line voltage detection unit 210, the control of discharge unit
The control terminal of 220 output end connection energy-storage module.
In embodiment provided by the invention, the line voltage detection unit 210, for detecting the defeated of rectification module 10 in real time
Go out voltage Vac, and compare the output voltage Vac and threshold voltage vt h of rectification module 10 size, in the output of rectification module 10
Voltage Vac exports the first over-pressed signal to control of discharge unit 220 when being more than threshold voltage vt h；In the output of rectification module 10
Voltage Vac exports the second over-pressed signal to control of discharge unit 220 when being less than threshold voltage vt h；Because rectification module 10 is defeated
It is periodic to go out voltage Vac, and its cycle is T, therefore the over-pressed signal OVH is also periodic signal, is specifically believed by the first overvoltage
Number and the second over-pressed signal composition, its cycle be similarly T.The first over-pressed signal is high level or low level, and second is over-pressed
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 voltage corresponding to phase adjusted value,
And more than or equal to the conducting voltage of LED string 40, it is preferred that the threshold voltage vt h is the conducting voltage of LED string 40.By
Whether this, can judge LED string 40 according to the size for the output voltage Vac and threshold voltage vt h for judging rectification module 10
Light.
The control of discharge unit 220, it is the second mistake for over-pressed signal in two more adjacent over-pressed signal periods
Press the duration of signal；In shorter over-pressed signal period duration of the second over-pressed signal, by controlling 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 input voltage in signal period is consistent.In other words, the control of discharge unit 220, for more adjacent
Two over-pressed signal periods in over-pressed signal be the second over-pressed signal duration；In the overvoltage of odd number overvoltage signal period
Signal be the second over-pressed signal duration be more than the even number overvoltage signal period over-pressed signal be holding for the second over-pressed signal
During the continuous time, energy-storage module 30 is controlled to be powered to LED string 40 in the current and/or follow-up odd number overvoltage signal period, it
Afterwards when the over-pressed signal is changed into the first over-pressed signal from the second over-pressed signal, stop energy-storage module 30 and supplied to LED string 40
Electricity（Close energy-storage module 30）, powered by rectification module 10 to LED string 40, 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 over-pressed signal in the even number overvoltage signal period is more than the odd number overvoltage signal period for the duration of the second over-pressed signal
When over-pressed signal is the duration of the second over-pressed signal, pass through 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 over-pressed 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（Close energy-storage module 30）, powered, made to LED string 40 by rectification module 10
In the even number overvoltage signal period effective time of the input voltage of LED string with the odd number overvoltage signal period LED string it is defeated
The effective time for entering voltage is consistent.
Further, referring to Fig. 4, the control of discharge unit 220 includes timer 221 and control subelement 222.Institute
State control subelement 222 input be control of discharge unit 220 input, the output end of connecting line voltage detection unit,
The control terminal 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 being reset to timer 221 and opening timer；The first over-pressed signal is changed into from the second over-pressed signal in over-pressed signal and worked as
When the time of preceding timer 221 is less than the duration that over-pressed signal in the previous over-pressed signal period is the second over-pressed signal, by
Rectification module 10 is powered to LED string 40, energy-storage module 30 is closed output；It is more than or equal in the time of current timer
Over-pressed signal is the duration of the second over-pressed signal in the previous over-pressed signal period and now over-pressed signal is the second overvoltage letter
Number when, control energy-storage module 30 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 that the timing of timer 221 is powered and stopped to LED string 40 and records clocking value, and LED is given 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 the timing of timer 221 and record
Clocking value, when timer duration is less than the clocking value of previous periodic recording, does not trigger electric discharge and enable, all the time by rectification module 10
Powered 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 uses timer, when the conducting of LED string can be achieved by simple logic control
Between change, so as to eliminate stroboscopic, cost simple in construction is low, applied widely.
Referring to Fig. 5, in the first embodiment, the line voltage detection unit 210 includes first resistor R1, second resistance
R2, comparator Q1 and power supply V1；One end of the first resistor R1 is the input of line voltage detection unit 210, connects rectification
The output end of module 10 and the input of energy-storage module 30, the other end connection comparator Q1 of first resistor R1 positive are defeated
Enter to hold and be grounded by second resistance R2, the positive pole connection comparator Q1 of power supply V1 inverting input, the power supply V1
Negative pole ground connection, output end for line voltage detection unit 210 of the output end of the comparator Q1, the connection control of discharge list
The input of member 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 other end connection comparator Q1 of first resistor inverting input,
That is comparator Q1 is opposite with the connection of first embodiment.
Please continue to refer to Fig. 2, described LED controllable silicons phase controlled light modulator is eliminated in the circuit of stroboscopic, the energy storage
Module 30 includes switch K, the first diode D1, the second diode D2 and the energy-storage units 310 for energy storage；One or two pole
The pipe D1 just extremely input of energy-storage module 30, connects the input of the output end, line voltage detection unit 210 of rectification module 10
End and the second diode D2 positive pole；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, is connected
Second diode D2 negative pole and the positive pole of LED string 40；The control terminal of the switch K is the control terminal 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 controlling switch K break-make to can be achieved
The release of the energy of energy-storage units 310 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 first diode D1 negative pole；The electric capacity it is another
Hold as the output end of energy-storage units 310, connecting valve K one end.It follows that the present invention passes through cleverly circuit design, knot
Structure is simple, eliminates stroboscopic.
The circuit that described LED controllable silicons phase controlled light modulator eliminates stroboscopic also includes constant flow module I, the constant current mould
Block I is used to carry out constant current driving to LED string 40, and the LED string 40 is grounded by the constant flow module I.
Principle combination Fig. 3 of the present invention can be illustrated preferably, in the first embodiment, it is known that commutation cycle T,
Vac drops to 0V time Toffset from Vth, from the property of trigonometric function：
(t1-Toffset)/2/180 ° of 1/180 ° of T=θ, (t2-Toffset)/T=θ；Therefore the calculating to angle can turn
Change the calculating to the time into.Wherein, t1 and t2 is that over-pressed signal OVH is low level in the over-pressed signal period T of adjacent two
Duration, t2 ＞ t1；θ 1 and θ 2 is two adjacent over-pressed signal periods（Commutation cycle）In phase adjusted value.
It is high electricity that comparator Q1 detection rectifier bridge output voltages Vac, which is more than the over-pressed signal OVH that threshold voltage vt h is then exported,
It is flat, it is otherwise low level.Control of discharge unit 220 measures the OVH of two neighboring over-pressed signal period
T1 and t2.Control of discharge unit 220 compares this cycle OVH when be the low time maintained with previous cycle OVH being low total
Between, if both are equal, and when OVH is not high, the discharge switch enable signal enable of control of discharge unit 220（Electric discharge
The output voltage of control unit）Export as high level, turn on switch K, the electric discharge of energy-storage module 30 shifts to an earlier date lightening LED lamp string, such as
A sections in Fig. 3 in the voltage waveform of LED string.Until OVH is high, the enable signal outputs of control of discharge unit
For low level, switch K is disconnected, LED statements based on collusion electricity is given by Vac, such as Fig. 3 T1 cycles；Otherwise, control of discharge unit
Enable signals remain low level, LED statements based on collusion electricity are given by Vac, such as Fig. 3 T2 cycles.So so that former and later two cycles
Time for lighting of lamp string it is equal.By taking the second over-pressed signal period T2 as an example, control of discharge unit 220 compares this cycle OVH and is
The low over-pressed signal period OVH of time t1 and first maintained are low total time t2, and t1 is both less than t2, control of discharge always
The enable signals of unit remain low level, and LED statements based on collusion electricity is given by Vac.After the 3rd over-pressed signal period T3 is entered, put
Electric control unit 220 compares this cycle OVH to be the low time t2 and second maintained over-pressed signal period OVH when being low total
Between t1, t2=t1 and OVH for it is high when, the discharge switch enable signal enable of control of discharge unit 220（Control of discharge
The output voltage of unit）Export as high level, turn on switch K, the electric discharge of energy-storage module 30 shifts to an earlier date lightening LED lamp string, in Fig. 3
A sections in the voltage waveform of LED string.Until OVH is high, the enable signal outputs of control of discharge unit are low electricity
It is flat, switch K is disconnected, LED statements based on collusion electricity is given by VAC.
When phase controlled light modulator dims LED, that is, phase theta is controlled to become big, 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, therefore not interfere with dimming effect.
The circuit of stroboscopic is eliminated based on the LED controllable silicons phase controlled light modulator in above-described embodiment, the present invention also provides
A kind of LED controllable silicons phase controlled light modulator, the light modulator include pcb board, and above-mentioned elimination frequency is provided with the pcb board
The circuit of sudden strain of a muscle.Because the concrete principle and detail technical features of the LED controllable silicons phase controlled light modulator are in above-described embodiment
In elaborated, will not be repeated here.
Circuit based on the LED controllable silicons phase controlled light modulator in above-described embodiment and its elimination stroboscopic, the present invention is also
A kind of method that LED controllable silicons phase controlled light modulator eliminates stroboscopic is provided, referring to Fig. 6, methods described comprises the following steps：
S10, rectification module carry out rectification to have passed through phase-adjusted alternating current, and give 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；In phase adjusted
It is worth in the big commutation cycle, electricity is acted in collusion to make each other's confessions to extend the ON time of LED string to LED by energy-storage module, LED string is existed
ON time in the phase adjusted value big commutation cycle is consistent with the ON time in the commutation cycle that phase adjusted value is small.
Further, described LED controllable silicons phase controlled light modulator is eliminated in the method for stroboscopic, the step S20 tools
Body includes：
The frequent flashing control module that disappears detects the output voltage of rectification module in real time, and phase is obtained by the output voltage of rectification module
Regulating time corresponding to two adjacent commutation cycle respective phase adjusted values；During the regulation of two more adjacent commutation cycles
Between length, in the commutation cycle of regulating time length, leading for LED string is extended to LED electricity of acting in collusion to make each other's confessions by energy-storage module
The logical time, make in ON time of the LED string in the commutation cycle that regulating time is grown and regulating time small commutation cycle
ON time is consistent.
Described LED controllable silicons phase controlled light modulator is eliminated in the method for stroboscopic, and the frequent flashing control module that disappears includes
Line voltage detection unit and control of discharge unit；The step S20 specifically comprises the following steps：
210th, line voltage detection unit detects the output voltage of rectification module in real time, and compares the output voltage of rectification module
With the size of threshold voltage, the first over-pressed signal is exported when the output voltage of rectification module is more than threshold voltage to control of discharge
Unit；The second over-pressed signal is exported when the output voltage of rectification module is less than threshold voltage and gives control of discharge unit；The mistake
Pressure signal is periodic signal；
220th, over-pressed signal is the second over-pressed signal in two more adjacent over-pressed signal periods of control of discharge unit
Duration；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, make in the over-pressed signal period effective time of the input voltage of LED string with it is defeated in the adjacent over-pressed signal period
The effective time for entering voltage is consistent.
Further, the control of discharge unit includes timer and control subelement, and the step 220 is specifically wrapped
Include：Subelement is controlled 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 be more than or equal to the previous over-pressed signal period in over-pressed signal for the second over-pressed signal duration and this
When overvoltage signal when being the second over-pressed signal, control energy-storage module acts in collusion to make each other's confessions electricity to LED；It is changed into the first mistake in over-pressed signal afterwards
When pressing signal, when control energy-storage module stops to LED statements based on collusion electricity and stops timer.
Because the LED controllable silicons phase controlled light modulator eliminates the concrete principle and detail technical features of the method for stroboscopic
Elaborate, will not be repeated here in the above-described embodiments.
The division of above-mentioned functional module, can be as needed by above-mentioned function only to for example, in actual applications
Distribution is completed by different functional modules, that is, different functional modules is divided into, to complete all or part of foregoing description
Function.
It is understood that for those of ordinary skills, can be with technique according to the invention scheme and its hair
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect scope.
Claims (6)
1. a kind of LED controllable silicons phase controlled light modulator eliminates the circuit of stroboscopic, the circuit connects 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 give LED statements based on collusion electricity；
Energy-storage module, LED statements based on collusion electricity is given for storing electric energy, and according to the frequent flashing control module that disappears；
Disappear frequent flashing control module, the size for the phase adjusted value of two more adjacent commutation cycles；In phase adjusted value
In the big commutation cycle, electricity is acted in collusion to make each other's confessions to extend the ON time of LED string to LED by energy-storage module, makes LED string in phase
ON time in the position regulated value big commutation cycle is consistent with the ON time in the commutation cycle that phase adjusted value is small；
The output end of the rectification module connects the input for the frequent flashing control module that disappears and connects LED string by energy-storage module
Positive pole, the LED string negative pole ground connection, the frequent flashing control module that disappears output end connection energy-storage module control terminal；
The frequent flashing control module that disappears is specifically used for, and detects the output voltage of rectification module in real time, passes through the output of rectification module
Voltage obtains regulating time corresponding to two adjacent commutation cycle respective phase adjusted values；Two more adjacent rectification weeks
The length of the regulating time of phase, in the commutation cycle of regulating time length, electricity is acted in collusion to make each other's confessions to extend to LED by energy-storage module
The ON time of LED string, make small whole of ON time of the LED string in the commutation cycle that regulating time is grown and regulating time
The ON time flowed in the cycle is consistent；
The frequent flashing control module that disappears includes：
Line voltage detection unit, for detecting the output voltage of rectification module in real time, and compare the output voltage of rectification module with
The size of threshold voltage, the first over-pressed signal is exported when the output voltage of rectification module is more than threshold voltage and gives control of discharge list
Member；The second over-pressed signal is exported when the output voltage of rectification module is less than threshold voltage and gives control of discharge unit；The overvoltage
Signal is periodic signal；
Control of discharge unit, for the continuing for the second over-pressed signal of over-pressed signal in two more adjacent over-pressed signal periods
Time；In shorter over-pressed signal period duration of the second over-pressed signal, by controlling energy-storage module to be acted in collusion to make each other's confessions to LED
Electricity, make the effective time of the input voltage of LED string and the input electricity in the adjacent over-pressed signal period in the over-pressed signal period
The effective time of pressure is consistent.
2. LED controllable silicons phase controlled light modulator according to claim 1 eliminates the circuit of stroboscopic, it is characterised in that institute
Stating control of discharge unit includes：
Timer；
Subelement is controlled, for when over-pressed signal is changed into the second over-pressed signal from the first over-pressed signal, being reset simultaneously to timer
When opening timer；It is the second mistake to be more than or equal to over-pressed signal in the previous over-pressed signal period in the time of current timer
Press the duration of signal and when now over-pressed signal be the second over-pressed signal, control energy-storage module is electric to LED statements based on collusion；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,
LED statements based on collusion electricity is given by rectification module.
3. LED controllable silicons phase controlled light modulator according to claim 1 eliminates the circuit of stroboscopic, it is characterised in that institute
Stating line voltage detection unit includes first resistor, second resistance, comparator and power supply；One end of the first resistor is line voltage
The input of detection unit, connect the output end of rectification module and the input of energy-storage module；The other end of the first resistor
Connect the normal phase input end of comparator and be grounded by second resistance, the anti-phase input of the positive pole connection comparator of the power supply
End, the negative pole ground connection of the power supply, the output end of the comparator is the output end of line voltage detection unit, the connection electric discharge
The input of control unit.
4. LED controllable silicons phase controlled light modulator according to claim 1 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 just extremely input of energy-storage module, connects the output end of rectification module, the input of line voltage detection unit and the two or two pole
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 the negative pole and LED string of the second diode
Positive pole；The control terminal of the switch is the control terminal of energy-storage module, connects the output end of control of discharge unit.
5. a kind of LED controllable silicons phase controlled light modulator, it is characterised in that including as described in claim 1-4 any one
LED controllable silicons phase controlled light modulator eliminates the circuit of stroboscopic.
6. a kind of method that LED controllable silicons phase controlled light modulator eliminates stroboscopic, it is characterised in that comprise the following steps：
A, rectification module carries out rectification to have passed through phase-adjusted alternating current, and gives LED statements based on collusion electricity；
B, the size of the phase adjusted value of two more adjacent commutation cycles of the frequent flashing control module that disappears；Big in phase adjusted value
In commutation cycle, electricity is acted in collusion to make each other's confessions to extend the ON time of LED string to LED by energy-storage module, LED string is adjusted in phase
ON time in the section value big commutation cycle is consistent with the ON time in the commutation cycle that phase adjusted value is small；
The step B is specifically included：
The frequent flashing control module that disappears detects the output voltage of rectification module in real time, is obtained by the output voltage of rectification module adjacent
Regulating time corresponding to two commutation cycle respective phase adjusted values；The regulating time of two more adjacent commutation cycles
Length, in the commutation cycle of regulating time length, when acting in collusion to make each other's confessions electricity to LED to extend the conducting of LED string by energy-storage module
Between, make ON time of the LED string in the commutation cycle that regulating time is grown and the conducting in the regulating time small commutation cycle
Time consistency；
The frequent flashing control module that disappears includes：
Line voltage detection unit, for detecting the output voltage of rectification module in real time, and compare the output voltage of rectification module with
The size of threshold voltage, the first over-pressed signal is exported when the output voltage of rectification module is more than threshold voltage and gives control of discharge list
Member；The second over-pressed signal is exported when the output voltage of rectification module is less than threshold voltage and gives control of discharge unit；The overvoltage
Signal is periodic signal；
Control of discharge unit, for the continuing for the second over-pressed signal of over-pressed signal in two more adjacent over-pressed signal periods
Time；In shorter over-pressed signal period duration of the second over-pressed signal, by controlling energy-storage module to be acted in collusion to make each other's confessions to LED
Electricity, make the effective time of the input voltage of LED string and the input electricity in the adjacent over-pressed signal period in the over-pressed signal period
The effective time of pressure is consistent.
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| CN201610989861.6A CN106488611B (en) | 2016-11-10 | 2016-11-10 | The circuit of LED controllable silicons phase controlled light modulator and its elimination stroboscopic, method |
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| CN201610989861.6A CN106488611B (en) | 2016-11-10 | 2016-11-10 | The circuit of LED controllable silicons phase controlled light modulator and its elimination stroboscopic, method |
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| CN109587880B (en) * | 2018-12-18 | 2024-02-20 | 陕西亚成微电子股份有限公司 | Driving method and circuit for silicon controlled rectifier dimming LED |
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| CN103209526A (en) * | 2007-03-12 | 2013-07-17 | 塞瑞斯逻辑公司 | Light Emitting Diode (led) Lighting System And Method For Controlling The Led Lighting System |
| TWI468075B (en) * | 2011-10-07 | 2015-01-01 | Wafly Ltd | A dimming device |
| CN105992427A (en) * | 2015-01-30 | 2016-10-05 | 峒鑫科技股份有限公司 | Light-emitting diode dimming circuit |
| CN206164925U (en) * | 2016-11-10 | 2017-05-10 | 深圳市晟碟半导体有限公司 | LED silicon controlled rectifier phase control dimmer and eliminate stroboscopic circuit thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102257718B1 (en) * | 2014-10-01 | 2021-05-28 | 매그나칩 반도체 유한회사 | Circuit driving light emitting diode and light apparatus comprising the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103209526A (en) * | 2007-03-12 | 2013-07-17 | 塞瑞斯逻辑公司 | Light Emitting Diode (led) Lighting System And Method For Controlling The Led Lighting System |
| TWI468075B (en) * | 2011-10-07 | 2015-01-01 | Wafly Ltd | A dimming device |
| CN105992427A (en) * | 2015-01-30 | 2016-10-05 | 峒鑫科技股份有限公司 | Light-emitting diode dimming circuit |
| CN206164925U (en) * | 2016-11-10 | 2017-05-10 | 深圳市晟碟半导体有限公司 | LED silicon controlled rectifier phase control dimmer and eliminate stroboscopic circuit thereof |
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