CN106572563B - The method of the silicon-controlled phase controlled light modulators of LED and its elimination stroboscopic, circuit - Google Patents
The method of the silicon-controlled phase controlled light modulators of LED and its elimination stroboscopic, circuit Download PDFInfo
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- CN106572563B CN106572563B CN201610989299.7A CN201610989299A CN106572563B CN 106572563 B CN106572563 B CN 106572563B CN 201610989299 A CN201610989299 A CN 201610989299A CN 106572563 B CN106572563 B CN 106572563B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
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- 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 silicon-controlled phase controlled light modulators of LED and its method for stroboscopic, circuit are eliminated, wherein, the circuit includes rectification 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, the turn-off time of LED light string in the commutation cycle small by extending phase adjusted value, makes turn-off time of the LED light string in the phase adjusted value small commutation cycle consistent with the turn-off time in the commutation cycle that phase adjusted value is big；As a result, the ON time of LED light string is all identical in the adjacent commutation cycle, stroboscopic is eliminated.
Description
Technical field
The present invention relates to field of LED illumination, the silicon-controlled phase controlled light modulator of more particularly to a kind of LED and its stroboscopic is eliminated
Method, circuit.
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 positive phase adjusted of phase controlled light modulator output and the phase reversely adjusted
Position is inconsistent；The adjusting phase that odd cycle and even cycle are converted into after rectifier bridge is inconsistent；Finally it is embodied in LED light
On be odd cycle and even cycle brightness it is inconsistent, i.e. LED can flicker, and frequency is consistent with line voltage, be 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 second rectification of brightness ratio of the first commutation cycle LED
The brightness of period L ED is brighter；Similarly, brightness of the brightness of the 3rd commutation cycle LED also than the second commutation cycle LED is brighter, by
This forms visible stroboscopic.
Thus the 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 silicon-controlled phase controllings of LED
The method of light modulator and its elimination stroboscopic, circuit, 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 silicon-controlled phase controlled light modulators of LED eliminate the circuit of stroboscopic, and the circuit is connected with LED light string, described
Circuit includes：
Rectification module, for carrying out rectification to have passed through phase-adjusted alternating current, and powers to LED light string；
Disappear frequent flashing control module, for the size of the phase adjusted value of two more adjacent commutation cycles, passes through extension
The turn-off time of LED light string in the phase adjusted value small commutation cycle, makes LED light string in the phase adjusted value small commutation cycle
Turn-off time it is consistent with the turn-off time in the commutation cycle that phase adjusted value is big.
The silicon-controlled phase controlled light modulators of the LED are 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
The corresponding regulating time of respective phase adjusted value；The length of the regulating time of two more adjacent commutation cycles, is being adjusted
In short commutation cycle time, the turn-off time of LED light string, makes LED light string in the commutation cycle short by extending regulating time
Turn-off time in the regulating time short commutation cycle is consistent with the turn-off time in the commutation cycle that regulating time is grown.
The silicon-controlled phase controlled light modulators of the LED are 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 compares rectification module output voltage
Size between threshold voltage, the first over-pressed signal is exported when rectification module output voltage is more than threshold voltage and gives electric current control
Unit processed；The second over-pressed signal is exported when rectification module output voltage is less than threshold voltage to current control unit；The mistake
Pressure signal is periodic signal；
Current control unit, is the second over-pressed signal for over-pressed signal in more adjacent two over-pressed signal periods
Duration；In shorter over-pressed signal period duration of the second over-pressed signal, during by the shut-off that extends LED light string
Between, make turn-off time of the LED light string in the overvoltage signal period consistent with the turn-off time in the adjacent over-pressed signal period.
The silicon-controlled phase controlled light modulators of the LED are eliminated in the circuit of stroboscopic, and the current control unit includes：
Subelement is switched, for the control according to logic controller, the break-make of control LED light string electric current；
Logic controller, for record over-pressed signal in the previous over-pressed signal period for the second over-pressed signal it is lasting when
Between, it is denoted as at the first time；In the current over-pressed signal period, over-pressed signal is changed into the second over-pressed signal from the first over-pressed signal
When, turn off the electric current of LED light string and start timing；Stop when over-pressed signal is changed into the first over-pressed signal from the second over-pressed signal
Timing, obtained for the second time, and compared the size of the second time and first time；It is more than or equal at the first time in the second time
When, the electric current of LED light string is turned on, when the second time being less than first time, waits the electricity of conducting LED light string after the 3rd time
Stream.
The silicon-controlled phase controlled light modulators of the LED are eliminated in the circuit of stroboscopic, and the output terminal of the rectification module connects
The detection input of the line voltage detection unit and the cathode of LED light string are connect, the anode of the LED light string passes through the electric current
Control unit is grounded, and the detection output of the line voltage detection unit connects the control terminal of the current control unit.
The silicon-controlled phase controlled light modulators of the LED are eliminated in the circuit of stroboscopic, and the 3rd time is less than or equal to
The absolute value of difference between the second time at the first time.
The silicon-controlled phase controlled light modulators of the LED are 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 inputs for the detection of line voltage detection unit
The cathode at end, the output terminal of connection rectification module and LED light string, the positive of the other end connection comparator of the first resistor are defeated
Enter to hold and be grounded by second resistance, the inverting input of the cathode connection comparator of the power supply, the anode of the power supply connects
Ground, the output terminal of the comparator are the control of the detection output of line voltage detection unit, the connection current control unit
End.
A kind of silicon-controlled phase controlled light modulators of LED, including the silicon-controlled phase controlled light modulators of LED as described above eliminate
The circuit of stroboscopic.
A kind of method that silicon-controlled phase controlled light modulators of LED eliminate stroboscopic, includes the following steps：
A, rectification module carries out rectification to have passed through phase-adjusted alternating current, and powers to LED light string；
B, the size of the phase adjusted value of two more adjacent commutation cycles of the frequent flashing control module that disappears, by extending phase
The turn-off time of LED light string in the regulated value small commutation cycle, makes pass of the LED light string in the phase adjusted value small commutation cycle
The disconnected time is consistent with the turn-off time in the commutation cycle that phase adjusted value is big.
The silicon-controlled phase controlled light modulators of the LED are eliminated in the method for stroboscopic, and the step B is specifically included：In real time
The output voltage of rectification module is detected, two adjacent commutation cycle respective phases are obtained by the output voltage of rectification module
The corresponding regulating time of regulated value；The length of the regulating time of two more adjacent commutation cycles, in short whole of regulating time
Flow in the cycle, the turn-off time of LED light string, makes LED light string in regulating time in the commutation cycle short by extending regulating time
Turn-off time in the short commutation cycle is consistent with the turn-off time in the commutation cycle that regulating time is grown.
Compared to the prior art, the present invention provides a kind of silicon-controlled phase controlled light modulators of LED and its eliminates the side of stroboscopic
Method, circuit, wherein, the circuit includes rectification module and the frequent flashing control module that disappears.The frequent flashing control module that disappears it is more adjacent two
The size of the phase adjusted value of a commutation cycle, in the commutation cycle small by extending phase adjusted value during the shut-off of LED light string
Between, make in turn-off time of the LED light string in the phase adjusted value small commutation cycle and phase adjusted value big commutation cycle
Turn-off time is consistent；As a result, the ON time of LED light string is all identical in the adjacent commutation cycle, stroboscopic is eliminated.
Brief description of the drawings
Fig. 1 is in the silicon-controlled phase controlled light modulators of existing LED, line voltage, dimmer output voltage before light modulation, whole
Flow the oscillogram of bridge output voltage and the electric current of LED light.
Fig. 2 is the structure diagram for the circuit that the silicon-controlled phase controlled light modulators of LED provided by the invention eliminate stroboscopic.
Fig. 3 is that the silicon-controlled phase controlled light modulators of LED provided by the invention are eliminated in the circuit of stroboscopic, rectifier bridge output electricity
Pressure, over-pressed signal, the oscillogram for exporting signal of logic controller.
Fig. 4 is the circuit diagram for the circuit that the silicon-controlled phase controlled light modulators of LED provided by the invention eliminate stroboscopic.
Fig. 5 is that the silicon-controlled phase controlled light modulators of LED provided by the invention are eliminated in the circuit of stroboscopic, and line voltage detection is single
The circuit diagram of member.
Fig. 6 is that the silicon-controlled phase controlled light modulators of LED provided by the invention are eliminated in the circuit of stroboscopic, current control unit
Circuit diagram.
Fig. 7 is that the silicon-controlled phase controlled light modulators of LED provided by the invention are eliminated in the circuit of stroboscopic, logic controller
Structure diagram 1.
Fig. 8 is that the silicon-controlled phase controlled light modulators of LED provided by the invention are eliminated in the circuit of stroboscopic, logic controller
Structure diagram 2.
Fig. 9 is the method flow diagram for the method that the silicon-controlled phase controlled light modulators of LED provided by the invention eliminate stroboscopic.
Embodiment
The present invention provides a kind of silicon-controlled phase controlled light modulators of LED and its eliminates the method for stroboscopic, circuit.To make this hair
Bright purpose, technical solution 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 silicon-controlled phase controlled light modulators of LED eliminate stroboscopic, as shown in Fig. 2, the LED
The circuit that silicon-controlled phase controlled light modulator eliminates stroboscopic includes rectification module 10 and the frequent flashing control module 20 that disappears.The rectification mould
The input terminal input of block 10 have passed through phase-adjusted alternating current, and the rectification module 10 is connected by the frequent flashing control module 20 that disappears
LED light string 30.
The rectification module 10, for carrying out rectification to have passed through phase-adjusted alternating current, and supplies to LED light string 30
Electricity.In the present embodiment, the rectification module 10 is rectifier bridge.
The frequent flashing control module 20 that disappears, the phase adjusted value for two more adjacent commutation cycles（θ 1 and θ 2）'s
Size, the turn-off time of LED light string 30 in the commutation cycle small by extending phase adjusted value, makes LED light string 30 in phase tune
Turn-off time in the section value small commutation cycle is consistent with the turn-off time in the commutation cycle that phase adjusted value is big.Thus, make
It is all identical to obtain the ON time of LED light string 30 in adjacent each commutation cycle, eliminates stroboscopic.
Further, the frequent flashing control module 20 that disappears is specifically used for, and detects the output voltage of rectification module 10 in real time, leads to
The output voltage of over commutation module obtains the adjacent corresponding regulating time of two commutation cycle respective phase adjusted values；Compare
The length of the regulating time of two adjacent commutation cycles, in the regulating time short commutation cycle, by extending regulating time
The turn-off time of LED light string 30 in the short commutation cycle, when making shut-off of the LED light string 30 in the regulating time short commutation cycle
Between with regulating time length commutation cycle in turn-off time it is consistent.The corresponding regulating time of the phase adjusted value, just refers to
In Fig. 3, the 2 corresponding period of θ 1 and θ.
The present invention indirectly represents phase adjusted value with the time, and the time is more readily detected, therefore improves the standard of adjusting
True property.
As shown in figure 4, the frequent flashing control module 20 that disappears includes line voltage detection unit 210 and current control unit 220.
The line voltage detection unit 210, for detecting the output voltage Vac of rectification module 10 in real time, and compares rectification
Size between module output voltage Vac and threshold voltage vt h, when rectification module output voltage Vac is more than threshold voltage vt h
The first over-pressed signal is exported to current control unit 220；Exported when rectification module output voltage Vac is less than threshold voltage vt h
Second over-pressed signal is to current control unit 220；Because rectification module output voltage Vac is periodic, its cycle is T, therefore
The overvoltage signal OVH is also periodic signal, is specifically made of the first over-pressed signal and the second over-pressed signal, its cycle is similarly
T.The first over-pressed signal be high level or low level, and the second over-pressed signal is low level or high level, the first overvoltage signal
It is different from the second over-pressed signal.In the present embodiment, the first over-pressed signal is high level, and the described second over-pressed signal is low level.
The threshold voltage vt h is less than the corresponding voltage of phase adjusted value, and more than or equal to the conducting voltage of LED light string 40, it is preferred that
The threshold voltage vt h is the conducting voltage of LED light string 40.Thus, it is possible to according to the output voltage Vac for judging rectification module 10
Judge whether LED light string 40 is lighted with the size of threshold voltage vt h.
The current control unit 220, is the second mistake for over-pressed signal in more adjacent two over-pressed signal periods
Press the duration of signal；In shorter over-pressed signal period duration of the second over-pressed signal, by extending LED light string
30 turn-off time, makes turn-off time of the LED light string 30 in the overvoltage signal period and the pass in the adjacent over-pressed signal period
Disconnected time consistency.
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 current control unit 220 can also be retouched by odd cycle and even cycle
State.I.e. described current control unit 220, believes for over-pressed signal in more adjacent two over-pressed signal periods for the second overvoltage
Number duration；It is less than even number overvoltage in the over-pressed signal of odd number over-pressed signal period for the duration of the second over-pressed signal
When the over-pressed signal of signal period is the duration of the second over-pressed signal, in current and/or follow-up odd number overvoltage signal week
The interim turn-off time by extending LED light string 30, make turn-off time of the LED light string 30 in the overvoltage signal period with it is adjacent
Turn-off time in the over-pressed signal period is consistent.And the over-pressed signal in the even number over-pressed signal period is the second over-pressed signal
Duration be less than the over-pressed signal of odd number over-pressed signal period for the second over-pressed signal duration when, current and/or
By extending the turn-off time of LED light string 30 in the follow-up even number over-pressed signal period, make LED light string 30 in overvoltage signal week
The interim turn-off time is consistent with the turn-off time in the adjacent over-pressed signal period.
The rectification module 10（Rectifier bridge）Input terminal connection alternating current provide end, i.e. the rectification module 10（Rectification
Bridge）Input terminal input have passed through phase-adjusted alternating current AC；The rectification module 10（Rectifier bridge）Output terminal connection institute
State the detection input 1 of line voltage detection unit 210 and the cathode of LED light string 30, the anode of the LED light string 30 passes through described
Current control unit 220 is grounded, and the detection output 2 of the line voltage detection unit 210 connects the current control unit 220
Control terminal.
Referring to Fig. 5, the line voltage detection unit 210 includes first resistor R1, second resistance R2, comparator Q1 and electricity
Source V1；One end of the first resistor R1 is the detection input of line voltage detection unit 210, connects the output of rectification module 10
End and the cathode of LED light string 30, the normal phase input end of the other end connection comparator Q1 of the first resistor R1 simultaneously pass through second
Resistance R2 is grounded, the inverting input of the cathode connection comparator Q1 of the power supply V1, and the anode ground connection of the power supply V1 is described
The output terminal of comparator Q1 is the control of the detection output of line voltage detection unit 210, the connection current control unit 220
End.The voltage of the power supply V1 is exactly threshold voltage vt h.
Referring to Fig. 6, the current control unit 220 includes logic controller 221 and switch subelement 222.It is described to patrol
The input terminal for collecting controller 221 is the control terminal of current control unit 220, and the output terminal connection of the logic controller 221 is opened
The control terminal of climax unit 222, the anode of the input terminal connection LED light string 30 of the switch subelement 222, switch are single
The output head grounding of member 222.
The switch subelement 222 is used for the control according to logic controller 221, controls the break-make of LED light string electric current, tool
Body, the break-make of 30 electric current of LED light string is controlled by the break-make of itself, so as to adjust the brightness of LED light string 30.
Preferably, the switch subelement 222 includes metal-oxide-semiconductor M1.The drain electrode of the metal-oxide-semiconductor is switch subelement input
End, the anode of connection LED light string；The grid of the metal-oxide-semiconductor is the control terminal of switch subelement, connects the output of logic controller
End；The source electrode ground connection of the metal-oxide-semiconductor.In other words, the input terminal of the logic controller 221 is current control unit 220
Control terminal, the grid of the output terminal connection metal-oxide-semiconductor M1 of the logic controller 221, the drain electrode connection LED light of the metal-oxide-semiconductor M1
The anode of string 30, the source electrode ground connection of the metal-oxide-semiconductor M1.The metal-oxide-semiconductor M1 is used as switching tube, is NMOS in the present embodiment
Pipe, controls the break-make of 30 electric current of LED light string, so as to adjust the brightness of LED light string 30.Certainly, the switch subelement 222 may be used also
The component that other have switching function with use PMOS tube, silicon-controlled etc..
The logic controller 221 is built-in with timer, and the logic controller 221 is used to record previous over-pressed signal week
Interim overvoltage signal OVH is the duration of the second over-pressed signal, is denoted as first time t1；In the current over-pressed signal period
In, when over-pressed signal OVH is changed into the second over-pressed signal from the first over-pressed signal, turn off the electric current of LED light string（Export low level letter
Number give metal-oxide-semiconductor M1 grid）And remove clocking value and restart timing；It is changed into the from the second over-pressed signal in over-pressed signal OVH
During one over-pressed signal, stop timing and record clocking value, obtain the second time t2, and compare the second time t2 and first time t1
Size；When the second time t2 is more than or equal to first time t1, the electric current of LED light string is turned on immediately（Export high level signal
Grid to metal-oxide-semiconductor M1）, when the second time t2 is less than first time t1, wait the 3rd time t3（Timer is allowed to continue timing
To the 3rd time）Grid of the high level signal to metal-oxide-semiconductor M1 is exported afterwards（Turn on the electric current of LED light string 30）.3rd time
T3 is less than or equal to the absolute value of the difference between the second time at the first time.The 3rd time t3 is equal at the first time with the
The absolute value effect of difference is best between two times, certainly, it is contemplated that the factor such as trueness error, the 3rd time t3 with it is described definitely
It is equal that value also is regarded as there are a certain range of deviation.
Referring to Fig. 7, in the present embodiment, the logic controller 221 includes the first timer 2211, memory 2212
With CL Compare Logic subelement 2213.
First timer 2211, believes for recording over-pressed signal OVH in the previous over-pressed signal period for the second overvoltage
Number duration, be denoted as first time t1 and be stored in memory 2212.CL Compare Logic subelement 2213 is then being worked as
In the preceding over-pressed signal period, when over-pressed signal OVH is changed into the second over-pressed signal from the first over-pressed signal, LED light string is turned off
Electric current（Export grid of the low level signal to metal-oxide-semiconductor M1）And the clocking value of the first timer 2211 is removed, allow the first timer
2211 restart timing；When over-pressed signal OVH is changed into the first over-pressed signal from the second over-pressed signal, stop the first timer
2211 timing.First timer 2211 obtains the second time t2, and stores it in memory 2212.CL Compare Logic is single
Member 2213 compares the size of the second time t2 and first time t1；When the second time t2 is more than or equal to first time t1, immediately
The electric current of LED light string is turned on, when the second time t2 is less than first time t1, high level signal is exported after waiting the 3rd time t3
Grid to metal-oxide-semiconductor M1（Turn on the electric current of LED light string 30）.
In another embodiment, shown in described Fig. 8, the logic controller 221, which removes, includes the first timer 2211, storage
Outside device 2212, CL Compare Logic subelement 2213, the second timer 2214 is further included.The CL Compare Logic subelement 2213 is second
When time t2 is less than first time t1, start 2214 timing of the second timer, in 2214 timing the 3rd of the second timer
Between export grid of the high level signal to metal-oxide-semiconductor M1 after t3（Turn on the electric current of LED light string 30）.
Can preferably it be illustrated with reference to Fig. 3, the 3rd using in Fig. 3 commutation cycle is used as current period, it is known that rectification week
Phase is T, and Vac drops to the time Toffset of 0V from Vth, from the property of trigonometric function：
(t1-Toffset)/1/180 ° of 2/180 ° of T=θ, (t2-Toffset)/T=θ；Therefore the calculating to angle can turn
Change the calculating to the time into.
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.The logic controller measurement two neighboring over-pressed signal period（T1 and T2）OVH be to distinguish low time
For t1 and t2, the OVH that logic controller compares this overvoltage signal period T2 is low time t2 and previous over-pressed signal period T1
OVH be low time t1, if t2 >=t1, OVH for it is high when, logic controller output signal EN be high level, lead
Logical LED light string, such as the T3 cycles in Fig. 3；Otherwise t2<T1, then when OVH is high, the EN signals of logic controller remain
Low level, disconnects LED light string, waits t3（t3=t1-t2）Time after to change EN signals again be high level, turn on LED light string,
Such as the T2 cycles of Fig. 3.So so that former and later two cycles（T1 and T2）Time for lighting of lamp string it is equal, i.e. in each cycle
The time that lamp string is lighted is T-t1.When phase controlled light modulator dims LED light, i.e. control phase theta becomes larger, this circuit can
To make an immediate response；When phase controlled light modulator lightens LED light, i.e. control phase theta diminishes, this circuit needs to postpone 1 rectification
Periodic response, but the time of 1 commutation cycle will not be caught by human eye, therefore lighten and dim and do not interfere with the present invention and disappear
Except the effect of stroboscopic.
The circuit of stroboscopic is eliminated based on the silicon-controlled phase controlled light modulators of LED in above-described embodiment, the present invention also provides
A kind of silicon-controlled phase controlled light modulators of LED, 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.Since the concrete principle and detail technical features of the silicon-controlled phase controlled light modulators of the LED are in above-described embodiment
In elaborated, details are not described herein.
The circuit of stroboscopic is eliminated based on the silicon-controlled phase controlled light modulators of LED in above-described embodiment, the present invention also provides
A kind of method that silicon-controlled phase controlled light modulators of LED eliminate stroboscopic, referring to Fig. 7, described method includes following steps：
S10, rectification module carry out rectification to have passed through phase-adjusted alternating current, and power to LED light string.
The size of the phase adjusted value of two more adjacent commutation cycles of S20, the frequent flashing control module that disappears, by extending phase
The turn-off time of LED light string, makes LED light string in the phase adjusted value small commutation cycle in the position regulated value small commutation cycle
Turn-off time is consistent with the turn-off time in the commutation cycle that phase adjusted value is big.
The step S20 is specifically included：The frequent flashing control module that disappears detects the output voltage of rectification module in real time, passes through rectification
The output voltage of module obtains the adjacent corresponding regulating time of two commutation cycle respective phase adjusted values；More adjacent
The length of the regulating time of two commutation cycles, in the regulating time short commutation cycle, by extending short whole of regulating time
The turn-off time of LED light string in the cycle is flowed, when making turn-off time of the LED light string in the regulating time short commutation cycle and adjusting
Between turn-off time in long commutation cycle it is consistent.
Further, the frequent flashing control module that disappears includes line voltage detection unit and current control unit；The step
S20 specifically comprises the following steps：
S210, line voltage detection unit detect the output voltage of rectification module in real time, and compare rectification module output voltage
Size between threshold voltage, the first over-pressed signal is exported when rectification module output voltage is more than threshold voltage and gives electric current control
Unit processed；The second over-pressed signal is exported when rectification module output voltage is less than threshold voltage to current control unit；The mistake
Pressure signal is periodic signal.
Over-pressed signal is the second over-pressed signal in two more adjacent over-pressed signal periods of S220, current control unit
Duration；In shorter over-pressed signal period duration of the second over-pressed signal, during by the shut-off that extends LED light string
Between, make turn-off time of the LED light string in the overvoltage signal period consistent with the turn-off time in the adjacent over-pressed signal period.
Further, the step S220 is specifically included：Logic controller records overvoltage letter in the previous over-pressed signal period
Number for the second over-pressed signal duration, be denoted as at the first time；In the current over-pressed signal period, over-pressed signal is by first
When over-pressed signal is changed into the second over-pressed signal, turns off the electric current of LED light string and start timing；Believed in over-pressed signal by the second overvoltage
Number it is changed into stopping timing during the first over-pressed signal, obtained for the second time, and compare the size of the second time and first time；
When two times were more than or equal to first time, the electric current of LED light string is turned on, when the second time being less than first time, waits the 3rd
The electric current of LED light string is turned on after time.
Since the silicon-controlled phase controlled light modulators of the LED eliminate the concrete principle and detail technical features of the method for stroboscopic
Elaborate in the above-described embodiments, details are not described herein.
The division of above-mentioned function module, can be as needed by above-mentioned function only to for example, in practical applications
Distribution is completed by different function modules, that is, different function 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 (10)
1. a kind of silicon-controlled phase controlled light modulators of LED eliminate the circuit of stroboscopic, the circuit is connected with LED light string, its feature
It is, the circuit includes：
Rectification module, for carrying out rectification to have passed through phase-adjusted alternating current, and powers to LED light string；
Disappear frequent flashing control module, for the size of the phase adjusted value of two more adjacent commutation cycles, by extending phase
The turn-off time of LED light string in the regulated value small commutation cycle, makes pass of the LED light string in the phase adjusted value small commutation cycle
The disconnected time is consistent with the turn-off time in the commutation cycle that phase adjusted value is big so that LED light in adjacent each commutation cycle
The ON time of string is all identical, eliminates stroboscopic.
2. the silicon-controlled phase controlled light modulators of LED according to claim 1 eliminate the circuit of stroboscopic, it is characterised in that institute
State the frequent flashing control module that disappears to be specifically used for, detect the output voltage of rectification module in real time, obtained by the output voltage of rectification module
To the adjacent corresponding regulating time of two commutation cycle respective phase adjusted values；The tune of two more adjacent commutation cycles
Save the length of time, in the regulating time short commutation cycle, LED light string in the commutation cycle short by extending regulating time
Turn-off time, made in the commutation cycle that turn-off time of the LED light string in the regulating time short commutation cycle is grown with regulating time
Turn-off time it is consistent.
3. the silicon-controlled phase controlled light modulators of LED according to claim 1 eliminate the circuit of stroboscopic, it is characterised in that institute
Stating the frequent flashing control module that disappears includes：
Line voltage detection unit, for detecting the output voltage of rectification module in real time, and compares rectification module output voltage and threshold
Size between threshold voltage, the first over-pressed signal is exported when rectification module output voltage is more than threshold voltage and gives current control list
Member；The second over-pressed signal is exported when rectification module output voltage is less than threshold voltage to current control unit；The overvoltage letter
Number it is periodic signal；
Current control unit, continues for over-pressed signal in more adjacent two over-pressed signal periods for the second over-pressed signal
Time；In shorter over-pressed signal period duration of the second over-pressed signal, by extending the turn-off time of LED light string,
Make turn-off time of the LED light string in the overvoltage signal period consistent with the turn-off time in the adjacent over-pressed signal period.
4. the silicon-controlled phase controlled light modulators of LED according to claim 3 eliminate the circuit of stroboscopic, it is characterised in that institute
Stating current control unit includes：
Subelement is switched, for the control according to logic controller, the break-make of control LED light string electric current；
Logic controller, is the duration of the second over-pressed signal, note for recording over-pressed signal in the previous over-pressed signal period
For at the first time；In the current over-pressed signal period, when over-pressed signal is changed into the second over-pressed signal from the first over-pressed signal, close
The electric current of disconnected LED light string simultaneously starts timing；Stop timing when over-pressed signal is changed into the first over-pressed signal from the second over-pressed signal,
Obtained for the second time, and compare the size of the second time and first time；When the second time being more than or equal to first time, conducting
The electric current of LED light string, when the second time being less than first time, waits the electric current of conducting LED light string after the 3rd time.
5. the silicon-controlled phase controlled light modulators of LED according to claim 3 eliminate the circuit of stroboscopic, it is characterised in that institute
The output terminal for stating rectification module connects the detection input of the line voltage detection unit and the cathode of LED light string, the LED light
The anode of string is grounded by the current control unit, and the detection output of the line voltage detection unit connects the electric current control
The control terminal of unit processed.
6. the silicon-controlled phase controlled light modulators of LED according to claim 4 eliminate the circuit of stroboscopic, it is characterised in that institute
State absolute value of the 3rd time less than or equal to difference between first time and the second time.
7. the silicon-controlled phase controlled light modulators of LED according to claim 3 eliminate 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 cathode of the detection input of detection unit, the output terminal for connecting rectification module and LED light string, 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 cathode connection comparator of the power supply
End, the anode ground connection of the power supply, the output terminal of the comparator is the detection output of line voltage detection unit, described in connection
The control terminal of current control unit.
8. a kind of silicon-controlled phase controlled light modulators of LED, it is characterised in that including as described in claim 1-7 any one
The silicon-controlled phase controlled light modulators of LED eliminate the circuit of stroboscopic.
9. a kind of method that silicon-controlled phase controlled light modulators of LED eliminate stroboscopic, it is characterised in that include the following steps：
A, rectification module carries out rectification to have passed through phase-adjusted alternating current, and powers to LED light string；
B, the size of the phase adjusted value of two more adjacent commutation cycles of the frequent flashing control module that disappears, by extending phase adjusted
It is worth the turn-off time of LED light string in the small commutation cycle, when making shut-off of the LED light string in the phase adjusted value small commutation cycle
Between it is consistent with the turn-off time in the commutation cycle that phase adjusted value is big so that LED light string in adjacent each commutation cycle
ON time is all identical, eliminates stroboscopic.
10. the method that the silicon-controlled phase controlled light modulators of LED according to claim 9 eliminate stroboscopic, it is characterised in that institute
Step B is stated to specifically include：The output voltage of detection rectification module in real time, adjacent two are obtained by the output voltage of rectification module
The corresponding regulating time of a commutation cycle respective phase adjusted value；The length of the regulating time of two more adjacent commutation cycles
It is short, in the regulating time short commutation cycle, the turn-off time of LED light string in the commutation cycle short by extending regulating time,
Make turn-off time of the LED light string in the regulating time short commutation cycle and the turn-off time in the commutation cycle of regulating time length
Unanimously.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201316830A (en) * | 2011-10-07 | 2013-04-16 | Wafly Ltd | Dimming method and device |
| 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 |
| CN105992427A (en) * | 2015-01-30 | 2016-10-05 | 峒鑫科技股份有限公司 | Light-emitting diode dimming circuit |
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Patent Citations (3)
| 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 |
| TW201316830A (en) * | 2011-10-07 | 2013-04-16 | Wafly Ltd | Dimming method and device |
| CN105992427A (en) * | 2015-01-30 | 2016-10-05 | 峒鑫科技股份有限公司 | Light-emitting diode dimming circuit |
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