CN110099486A - A kind of adjusting control circuit and dimming controlling method - Google Patents
A kind of adjusting control circuit and dimming controlling method Download PDFInfo
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- CN110099486A CN110099486A CN201910363004.9A CN201910363004A CN110099486A CN 110099486 A CN110099486 A CN 110099486A CN 201910363004 A CN201910363004 A CN 201910363004A CN 110099486 A CN110099486 A CN 110099486A
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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
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Abstract
The invention discloses a kind of adjusting control circuits, light modulation sub-circuit including N number of parallel connection, wherein dim the output loop that sub-circuit includes the switching circuitry being serially connected between direct current driving power supply positive and negative anodes and is serially connected between load circuit positive and negative anodes, the switching circuitry includes switch element and the sampled point for exporting sampled signal, output loop includes test side, judges whether output loop has electric current process；Control circuit turns off switch element according to the comparison result of the sampled signal and preset shutdown threshold value, according to switch element described in detection signal conduction.Adjusting control circuit and dimming controlling method provided by the embodiments of the present application, pass through alternate conduction multi-channel parallel circuit, in conjunction with MCU or Digital Circuit Control device control technology, realize that high power load range, high efficiency, high-precision dim simultaneously, high depth light modulation, for full dimming scope without stroboscopic, dimming process is smooth, and the good target for driving interior heat distribution.
Description
Technical field
The present invention relates to field of circuit technology more particularly to a kind of adjusting control circuits.
Background technique
In recent years, LED has been obtained universal as the illuminator of light source.Promotion with people to lighting requirement,
Present LED lamp can all have dimming function.Existing dimming mode provides certain frequency generally by light source load
Dimming control signal, switch on and off to control driving output to what light source load power, pass through control dimming control signal
Pulse width (turn-on time) dimmed.Under such dimming mode, in the case where light modulation brightness is darker, drive defeated
Turn-on time out in one cycle is shorter, this may cause flashing.
So that high power load range, high efficiency can be achieved at the same time in light adjusting circuit, high-precision is dimmed, high depth tune
Light, for full dimming scope without stroboscopic, dimming process is smooth, and heat distribution is a urgent problem to be solved in good driving.
Summary of the invention
The embodiment of the present invention provides a kind of adjusting control circuit and dimming controlling method, for solving existing light adjusting circuit
Stroboscopic problem.
The embodiment of the present invention adopts the following technical solutions:
In a first aspect, input terminal is direct current driving power supply the present invention provides a kind of adjusting control circuit, output end is load
Circuit, comprising:
The light modulation sub-circuit of N number of parallel connection, wherein N >=2, the light modulation sub-circuit are positive and negative including being serially connected in the direct current driving power supply
Switching circuitry between pole and the output loop being serially connected between the load circuit positive and negative anodes, the switching circuitry include opening
It closes element and exports the sampled point of sampled signal, the output loop includes test side, the one detection letter of test side output
Number, to judge whether output loop has electric current process；
Control circuit controls the turn-on and turn-off of the switch element in each light modulation sub-circuit, wherein the control electricity
Road turns off the switch element according to the comparison result of the sampled signal and preset shutdown threshold value, the control circuit according to
Switch element described in the detection signal conduction.
Further, the light modulation sub-circuit further includes afterflow diode and sampling resistor, and the direct current driving power supply is just
Pole, the afterflow diode, the switch element, the sampling resistor, the direct current driving power supply cathode are followed in series to form
The switching circuitry, wherein the cathode of the afterflow diode connects the anode of the direct current driving power supply, the switch element
Tie point between the sampling resistor is the sampled point, and the voltage value of the sampled point is the sampled signal, the pass
Disconnected threshold value is voltage value Visit, and when the sampled signal is greater than Visit, the control circuit control turns off the switch member
Part.
Further, the light modulation sub-circuit further includes inductive transformer, the inductive transformer include armature winding and
Secondary windings, the load circuit anode, the afterflow diode, the armature winding of the inductive transformer, load electricity
Road cathode is followed in series to form the output loop, wherein the afterflow diode cathode connects the anode of the load circuit,
Secondary windings one end of the inductive transformer is grounded, and the other end is the test side, and the detection signal is zero passage detection letter
Number.
Further, the control circuit receives the zero passage detection signal transmitted the test side, when under the electric current of test side
After being reduced to zero, the switch element is connected in control.
Further, the control circuit receives the zero passage detection signal transmitted the test side, when under the electric current of test side
After being reduced to zero, the switch element is connected in control after being spaced a time of having a rest Trest.
Further, when the adjusting control circuit starts, the control circuit controls each tune respectively in order
It is sequentially turned on after the switch element certain interval of time of photonic circuit, interval time lengths are equal to the light modulation electricity
Turn-on time of the switch element on road.
Further, each light modulation sub-block circuit design is the turn-off time of the switch element and the ratio of turn-on time
Value is N-1.
On the other hand, the present invention provides a kind of dimming controlling methods, are applied to adjusting control circuit as described above, packet
It includes:
Control circuit described in step A receives dimming control signal；
Control circuit described in step B sets control parameter according to dimming control signal, and the control parameter includes shutdown threshold value；
Control circuit described in step C controls the conducting of the switch element in each light modulation sub-circuit according to control parameter
And shutdown, comprising: the switch element, the control are turned off according to the comparison result of the sampled signal and the shutdown threshold value
Circuit switch element according to the detection signal conduction.
Further, in the step B, control parameter further includes time of having a rest Trest, and the control circuit is according to described in
Dimming control signal determines that the adjusting control circuit with the first mode of operation or with the second mode of operation, is preset
There is mode threshold；
When that need to dim illumination more than or equal to mode threshold, the control circuit controls the adjusting control circuit with described first
Mode of operation, the time of having a rest, Trest was set as zero, when any output loop electric current drops to zero, the control electricity
Road directly controls the conducting switch element；
When that need to dim illumination less than or equal to mode threshold, the control circuit controls the adjusting control circuit with described second
Mode of operation, time of having a rest Trest are arranged according to the dimming control signal, and value is greater than zero, when any output
When loop current drops to zero, the corresponding light modulation sub-circuit of control conducting after the time of having a rest Trest of one, the control circuit interval
In the switch element.
Further, in the step C,
When switch element described in each light modulation sub-circuit is connected after receiving the dimming control signal for the first time, the control
Circuit sequentially turns on after controlling the switch element certain interval of time of each light modulation sub-circuit respectively in order, when interval
Between length be equal to one it is described light modulation sub-circuit the switch element a turn-on time.
Further, the ratio of the turn-off time of the switch element and turn-on time is N-1.
At least one above-mentioned technical solution used in the embodiment of the present invention can reach it is following the utility model has the advantages that
Adjusting control circuit and dimming controlling method provided in an embodiment of the present invention pass through alternate conduction multi-channel parallel circuit, knot
MCU or Digital Circuit Control device control technology are closed, while realizing high power load range, high efficiency, high-precision dims, high depth
Light modulation, for full dimming scope without stroboscopic, dimming process is smooth, and the good target for driving interior heat distribution.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is that a kind of structure of adjusting control circuit connected with driving power, load circuit provided in an embodiment of the present invention is shown
It is intended to;
Fig. 2 is a kind of electrical block diagram of adjusting control circuit provided in an embodiment of the present invention；
Fig. 3 is a kind of flow diagram of dimming controlling method provided in an embodiment of the present invention；
Fig. 4 is the output waveform figure in Fig. 2 embodiment circuit, when light modulation brightness is 100%；
Fig. 5 is the output waveform figure in Fig. 2 embodiment circuit, when light modulation brightness is 20%；
Fig. 6 is the output waveform figure in Fig. 2 embodiment circuit, when light modulation brightness is 10%；
Fig. 7 is the output waveform figure in Fig. 2 embodiment circuit, when light modulation brightness is 2.5%.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
As shown in Figure 1 and Figure 2, wherein input terminal is direct current driving power supply to adjusting control circuit 2 provided in an embodiment of the present invention
1, VDC is positive for the input voltage of tens of volts to hundreds of volts, and GND is input voltage cathode, and C0 is input filter capacitor.Output
End is load circuit 3, and load circuit 3 includes multiple concatenated LED in the present embodiment, and loading in other embodiments can also be with
It is the other light sources such as OLED, output end has and load output filter capacitor C2 in parallel.Adjusting control circuit 2 includes multiple parallel connections
Light modulation sub-circuit cir 1, cir 2 ... cir n, dim sub-circuit at least two, in the present embodiment include three tune
Photonic circuit n=3.
Each light modulation sub-circuit structure is consistent, and the structure that we exchange photonic circuit by taking cir 1 as an example is illustrated, defeated
Enter side direct current driving power supply anode VDC, afterflow diode D1, switch element Q1, sampling resistor R1, direct current driving power supply cathode
GND is followed in series to form switching circuitry 801 to a label, and the power element to be occurred preferably both has label.Wherein afterflow diode
The positive VDC of the cathode connection direct current driving power supply of D1, the tie point CS1 between switch element Q1 and sampling resistor R1 is sampling
Point.Adjusting control circuit 2 further includes control circuit 21, and control circuit 21 can be MCU plus peripheral circuit, be also possible to number
Circuit controller.Control circuit 21 issues the turn-on and turn-off of signal VGS1 control switch element Q1 to switch element Q1, at this
When VGS1 signal is high level, switch element Q1 is connected in embodiment, and switch element Q1 is turned off when VGS1 signal is low level.
Control circuit 21, which is received, is taken as signal using the voltage value of point CS1, and control circuit 21 can will be preset using signal and one
Shutdown threshold value be compared, shutdown threshold value be voltage value Visit, determined by the brightness degree that needs dim.Work as sampled signal
When greater than Visit, the VGS1 signal that control circuit 21 issues is that low level control turns off switch element Q1.
Dim sub-circuit cir 1 outlet side, by load circuit anode, afterflow diode D1, inductive transformer T1 at the beginning of
Grade winding, load circuit cathode are followed in series to form output loop 802.Wherein the cathode of afterflow diode D1 connects load circuit
Anode, the afterflow diode D1 in the present embodiment in switching circuitry 801 and output loop 802 is that two circuits share, and is such as chased after
Ask higher efficiency that can apply synchronous rectification.The electric current of inductive transformer T1 armature winding is flowed through labeled as I1, and inductance becomes
The secondary windings of depressor T1 is detected as current over-zero, to judge whether output loop 802 has an electric current process, i.e. I1 whether be
Zero.Secondary windings one end ground connection, the other end is test side, and detection signal ZCD1 is zero passage detection signal.Control circuit 21 receives
The detection signal ZCD1 that test side is transmitted, after when test side, electric current falls to zero, control circuit 21 issues high level conducting switch
Element Q1.
The sub- light adjusting circuit cir 1 of one be described above in the present embodiment, other each light adjusting circuit cir 2, cir n
Structure is consistent with cir 1, just repeats no more here.
In the adjusting control circuit 2 of the embodiment of the present invention, main brightness adjustment control is completed by control circuit 21
, below our the specific brightness adjustment controls that combine Fig. 2 how to carry out control circuit 21 to the adjusting control circuit 2 of Fig. 1 side
Method is illustrated.Mainly include following three step according to the basic flow chart of Fig. 2:
Control circuit 21 described in step A receives dimming control signal.Dimming control signal is input from the outside, can be by switch, face
Plate, remote controler, mobile phone app input, the application do not limit this.Dimming control signal can be preset light adjusting grade,
It can be non-pole light regulating signal.In the present embodiment, for convenience of explanation, in subsequent example, we with need to dim brightness and
The ratio of the maximum brightness of light source load indicates the information content for including in dimming control signal.
Step B control circuit 21 sets control parameter according to dimming control signal.Control parameter includes that we are noted earlier
Shutdown threshold value, control circuit 21 is according to the brightness percentage received in dimming control signal, setting shutdown threshold in the present embodiment
The voltage value Visit of value.
Step C control circuit 21 controls the turn-on and turn-off of the switch element in each light modulation sub-circuit according to control parameter.
Brightness adjustment control mainly pass through turn-on and turn-off respectively dim sub-circuit cir 1, the switch element Q1 in cir 2 ... cir n,
Q2 ... Qn is realized.Control circuit 21 is according to the sampled signal of sampled point CS1, CS2 ... CSn and shutdown threshold value Visit
Comparison result turn off switch element Q1, Q2 ... Qn, control circuit 21 according to detection signal ZCD1, ZCD2 ... ZCDn lead
It is logical.In each light modulation sub-circuit, when detection signal ZCD1, ZCD2 ... ZCDn drops to zero, switch element Q1, Q2 ... Qn
Conducting, the voltage of sampled point CS1, CS2 ... CSn gradually rises at this time.And when the voltage of sampled point CS1, CS2 ... CSn are high
When turning off threshold value Visit, control circuit 21 turns off switch element Q1, Q2 ... Qn, therefore can by adjusting the size of Visit
The working time of each light modulation sub-circuit is directly controlled, and the circuit working time will affect each light modulation sub-circuit cir 1, cir
The boosting amplitude of 2 ... cir n, and then reach the dimming effect of needs.
In the above description, it will be seen that each light modulation sub-circuit cir 1, cir 2 ... cir n packet
Switch conduction times and turn-off time are included, if the switch element Q1 of each light modulation sub-circuit cir 1, cir 2 ... cir n,
Q2 ... Qn is simultaneously turned on, and necessarily causes the electric current in switch conduction times section excessive, and is not had in the period of switch OFF
Electric current, the output of entire adjusting control circuit 2 rise and fall excessive.Therefore, control circuit 21 control each light modulation sub-circuit cir 1,
When cir 2 ... cir n, especially in each switch element Q1, Q2 ... Qn of the conducting for the first time that receives dimming control signal, and
Do not start each light modulation sub-circuit cir 1, cir 2 ... cir n not instead of simultaneously, controls each light modulation sub-circuit respectively in order
Cir 1, cir 2 ... cir n switch element Q1, Q2 ... Qn sequentially turn on.That is 21 shillings of Q1 conductings of control circuit, interval
Q2 is connected again after a period of time, then the switch element for dimming sub-circuit all the way is connected down in certain interval of time again, and so on
Until all light modulation sub-circuit all enters working condition.Each light modulation sub-circuit cir 1, cir 2 ... cir n after conducting,
It then works still according to the control mode in step C, is just not repeated to illustrate here.According to such method in the same time
In section, each light modulation sub-circuit cir 1, cir 2 ... cir n are respectively at different boost or depressurization processes, therefore can put down
It weighs total output.In the preferred case, control circuit 21 controls each light modulation sub-circuit cir 1, cir 2 ... respectively in order
Switch element Q1, Q2 ... Qn of cir n is sequentially turned on after certain interval of time, and interval time lengths are equal to light modulation
Turn-on time of the switch element of circuit.I.e. when the switch element shutdown of previous light modulation sub-circuit, the latter is opened
The switch element for dimming sub-circuit, is successively opened in this way.
It is actively to be arranged by control circuit 21, and respectively switched in subsequent work phase in first time turn-on switch component
Being turned on and off for element Q1, Q2 ... Qn is controlled according to the judgment method in step C, at this moment will appear when logical
When crossing the switch element of signal conduction one light modulation sub-circuit of detection, and the voltage of other light modulation sub-circuit sampled points does not increase also
To shutdown threshold value also still in boost phase the case where.Therefore, when circuit design, according to the quantity of light modulation sub-circuit, selection is not
The electronic component of same parameter, with resistance, the parameter of inductance, design of freewheeling circuit etc. is adjusted, so that when there is N number of light modulation
When circuit, the turn-off time of switch element is exactly N-1 times of turn-on time.The switch member of a sub-circuit under such circumstances
Part is opened in the switch element shutdown of another sub-circuit, and each sub-circuit circulation that dims sequentially turns on.Due to times such as each roads
Electric current when each way switch element conductive is connected is alternated to start to increase, and other switch elements are in off state electric current and exist
Successively decrease, due to setting switch element close after to time current crosses zero be N-1 times of switch conduction times, N way switch incremental change and
Decrement just offsets, and smooth current waveform occurs on output filter capacitor and light source load LED, current value is flat for each road
N times of equal current value, no strobe effect.
But the turn-off time of switch element described above and turn-on time ratio are only a kind of perfect condition, practical feelings
May be not achieved in condition above-mentioned ideal conditions (such as switch element close after to time current crosses zero be not switching elements conductive when
Between N-1 times) output filter capacitor C1 and light source load LED current still will appear a little ripples at this time, but each road curent change still can
It cancels out each other.In good design, overall ripple is much smaller than respectively N times of current ripples is worth in N way circuit.
Below we by brightness be 100% and 20% for, according to respectively dimmed in Fig. 1 embodiment circuit diagram sub-circuit cir 1,
Cir 2, cir n current waveform figure illustrate the actual current ripple effect of embodiment.
Fig. 3 is the effect dimmed when brightness is 100%, and wherein I1, I2, In are each road inductive transformer T1, T2, Tn primary
Winding current waveform, VGS1, VGS2, VGSn are the base stage switching waveform of three-way switch element Q1, Q2, Qn, I total be for
The total output waveform obtained after I1, I2, In three superposition.When dimming brightness is 100%, Viset is maximum preset value
Viset_max, after switch element Q1, Q2, the Qn on each road are sequentially turned on, pass when each road reaches preset value Viset by CS point voltage
Switch element is closed, then zero passage detection signal ZCD is waited to be connected again again, the working frequency on each road is 40KHZ at this time.Due to this
Embodiment circuit presses ideal Design of State, and it is the switching elements conductive time that switch element, which arrives time current crosses zero, in each road after closing
2 times, therefore when third road light modulation sub-circuit cir n switch element Qn shutdown when, the first via dim sub-circuit cir 1 in
Just zero passage, Q1 are connected ZCD1 again, into next cycle.In each period, switching elements conductive electric current starts to increase all the way
Added-time, and in addition double switch element is in closed state current step-down, three-way switch incremental change is just offseted with decrement,
Electric current I total on output filter capacitor C1 and light source load LED is that I1, I2, In three are added acquisition, shows one
Smooth current waveform, as shown in figure 3, current value is 3 times of each way switch average current value, no strobe effect.
Fig. 4 is the effect for dimming brightness when being 20%, waveform and when 100% difference less, it is unique unlike, due to adjusting
Brightness is 20%, therefore 20% that Viset is maximum preset value Viset_max is arranged in control circuit 21, at this time each road CS point electricity
The time that pressure reaches Viset shortens, and the turn-on time of switch element Q1, Q2, Qn also shorten therewith, and current over-zero is arrived after shutdown
Time also shorter, so that working frequency increases, each road current ripples amplitude reduces, and overall electric current also reduces.Each road at this time
Working frequency is 200KHZ or so.
We are it can be found that dim the working frequency of sub-circuit with the reduction for dimming brightness from both the above example
It can get higher, since direct current driving power supply as input itself is also rectangular wave, the working frequency for dimming sub-circuit be should be less than directly
Driving power is flowed, otherwise will affect light modulation precision.Therefore there are two types of Working moulds for the tool of adjusting control circuit 21 in the present embodiment
Formula, control circuit 21 determine adjusting control circuit 2 is worked with which kind of mode according to dimming control signal.According to brightness adjustment control
The property of circuit 2 and input direct-current driving power presets a brightness as mode threshold, is in the present embodiment 20%,
When dimming brightness and being more than or equal to 20%, worked with the first operating mode, it is on the contrary then worked with the second operating mode.
First operating mode be exactly we described above 100% and 20% working condition, it is each to dim sub-circuit cir
1,2 cir ... cir n continuous work, when detecting signal ZCD1, ZCD2 ... ZCDn zero passage, i.e., output loop electric current declines
When to zero, control circuit 21 directly controls corresponding switch element Q1, Q2 ... the Qn of conducting, shown in waveform diagram 3, Fig. 4.
When dimming brightness lower than mode threshold 20%, the second operating mode, i.e. depth dimming mode are entered.It is at this time
Increase the working frequency of each light modulation sub-circuit cir 1, cir 2 ... cir n further, therefore does not continue to reduce and close
The value of disconnected threshold value Viset, value when still maintaining 20%, therefore Viset voltage value when 20% is minimum preset value Viset_
No matter min, dim how brightness continues downwards, this value is constant.It is kept not in the turn-on time of switch element Q1, Q2 ... Qn
In the case where change, in order to reduce output electric current, we only increase the shut-in time of switch element Q1, Q2 ... Qn.Therefore I
Introduce a new parameter time of having a rest Trest, in the second operation mode, when detection signal ZCD1, ZCD2 ... ZCDn mistake
When zero, i.e., when any output loop electric current drops to zero, control circuit 21 is not connected corresponding switch element at once, but
Conducting respective switch element is controlled again after being spaced a time of having a rest Trest.Stop in the second operation mode by adjusting Trest
Breath time interval dims to realize, the range of time interval Trest is very big, can be connected from 0 to switch element Q1, Q2 ... Qn
Thousands of times of time.Need to focus on be time of having a rest Trest is not to be applied only for the second light-modulating mode, time of having a rest
Trest is arranged by control circuit 21 according to light modulation brightness, when being worked with the first operating mode, time of having a rest Trest
This variable still has, and only sets 0 for its value, and phase is directly connected then can reach when electric current drops to zero
The effect for the switch element answered.The setting of time of having a rest Trest is completed in stepb, and control circuit 21 receives brightness adjustment control letter
Compare after number with mode threshold, it is 0 that time of having a rest Trest is then arranged more than or equal to mode threshold, no using the first operating mode
Then according to the corresponding time of having a rest Trest value of brightness setting need to be dimmed, with the second mode of operation.We are again with two below
Example illustrates the waveform situation under the second operating mode.
Fig. 5 is the waveform for dimming brightness when being 10%, wherein I1, I2, In be each road inductive transformer T1, T2, Tn primary around
Group current waveform, VGS1, VGS2, VGSn are the base stage switching waveform of three-way switch element Q1, Q2, Qn, I total be I1,
The total output waveform obtained after I2, In three superposition.It is minimum preset value Viset_min that Viset, which is arranged, in control circuit 21, i.e.,
Viset value when brightness is 20%, such switch element Q1, Q2, Qn arrive control circuit 21 after switch and receive zero detection signal
The time of ZCD, describing us for convenience was referred to as Twork this time as original.Now in order to make brightness be reduced to 20%
Half, therefore we are inserted into a time of having a rest equal with Twork, i.e. Twork=Trest, so that overall output electricity
Road I total average value halves (Twork/ (Twork+Trest)), to obtain deeper dimming effect.Overall electric current
Itotal have ripple occur but it is not high.Each road working frequency is 100KHZ at this time.Overall electric current ripple is 300KHZ.
Fig. 5 is the waveform dimmed when brightness is 2.5%, and each road working principle is similar to working principle when 10% at this time, only
Trest continues to increase multiple, reaches 7 times of Twork time.1/8 (Twork/ when overall output average current is 20%
It (Twork+Trest)), is 2.5%.Each road working frequency is 25KHZ at this time.Overall electric current ripple is 75KHZ.
Further, continue to increase when the Trest time, then deeper light modulation depth will be obtained.As the Trest time reaches
When to 199 times of the Twork time, will obtain 20%/(199+1)=0.1% is millesimal light modulation depth, at this time each road work
Working frequency is 200KHZ/(199+1)=1KHZ.Overall electric current ripple is 1KHZ*3=3KHZ.Similarly, Trest=Twork *
When 1999, depth is dimmed up to a ten thousandth.Overall electric current ripple is 300HZ.With IEEE Std 1789-2015 stroboscopic standard
From the point of view of, when ripple frequency f is greater than 90HZ and is less than or equal to 3125HZ, non-hazardous fluctuation depth bounds need to be less than percent f *
0.08/2.5.When one thousandth dims depth, which is 3000*0.08/2.5=96%.When a ten thousandth dims depth, which is
300*0.08/2.5=9.6%.When being parallel with biggish capacitor C1 in LED light, since average current is minimum at this time, even if very much
One of light modulation depth when LED current fluctuation depth be smaller than 9.6%.It still can reach the standard of non-hazardous stroboscopic.
In conclusion variable connector makes more times of output power to be incremented by, high power load range is realized.Each way switch uses
Zero current passing ZCS Mode B UCK structure, high efficiency easy to accomplish.Do not dim and low depth dim when, alternate conduction makes defeated
Overall ripple current greatly reduces out, so that no stroboscopic is realized, and when high depth light modulation, the effect of multichannel frequency multiplication improves line
Wave frequency rate is wanted to reduce the requirement to current fluctuation depth, to help and reach no stroboscopic when realizing the light modulation of high depth
It asks.It is inserted into the method and the effect of multichannel frequency multiplication of time of having a rest Trest simultaneously, realizes high depth light modulation.Light modulation whole process is without mutation
Factor exists, to realize smooth change.Since variable connector makes heat be evenly distributed in multiple element, and do not concentrate
On certain a small number of element, so as to improve heat dissipation.Make that small-power element can be used to realize high-power output simultaneously, makes component
Type selecting is more easier.Simultaneously because when alternation switch curent change cancel out each other effect and depth when dimming frequency multiplication act on, reduce
Requirement to output capacitance capacitance.
The technical staff in field is it should be appreciated that although preferred embodiments of the present invention have been described, but technology in the art
Personnel once know basic creative concept, then additional changes and modifications may be made to these embodiments.So appended power
Benefit requires to be intended to be construed to include preferred embodiment and all change and modification for falling into the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from model of the invention by those skilled in the art
It encloses.In this way, if these modifications and changes of the present invention is within the scope of the claims of the present invention and its equivalent technology, then
The present invention is also intended to include these modifications and variations.
Claims (11)
1. a kind of adjusting control circuit, input terminal is direct current driving power supply, and output end is load circuit, which is characterized in that packet
It includes:
The light modulation sub-circuit of N number of parallel connection, wherein N >=2, the light modulation sub-circuit are positive and negative including being serially connected in the direct current driving power supply
Switching circuitry between pole and the output loop being serially connected between the load circuit positive and negative anodes, the switching circuitry include opening
It closes element and exports the sampled point of sampled signal, the output loop includes test side, the one detection letter of test side output
Number, to judge whether output loop has electric current process；
Control circuit controls the turn-on and turn-off of the switch element in each light modulation sub-circuit, wherein the control electricity
Road turns off the switch element according to the comparison result of the sampled signal and preset shutdown threshold value, the control circuit according to
Switch element described in the detection signal conduction.
2. adjusting control circuit according to claim 1, which is characterized in that the light modulation sub-circuit further includes afterflow second level
Pipe and sampling resistor, the direct current driving power supply anode, the afterflow diode, the switch element, the sampling resistor, institute
It states direct current driving power supply cathode and is followed in series to form the switching circuitry, wherein the cathode connection of the afterflow diode is described straight
The anode for flowing driving power, the tie point between the switch element and the sampling resistor are the sampled point, the sampled point
Voltage value be the sampled signal, the shutdown threshold value is voltage value Visit, when the sampled signal is greater than Visit, institute
It states control circuit control and turns off the switch element.
3. adjusting control circuit according to claim 2, which is characterized in that the light modulation sub-circuit further includes inductance transformation
Device, the inductive transformer include armature winding and secondary windings, the load circuit anode, the afterflow diode, described
The armature winding of inductive transformer, the load circuit cathode are followed in series to form the output loop, wherein the afterflow two
Grade pipe cathode connects the anode of the load circuit, and secondary windings one end ground connection of the inductive transformer, the other end is described
Test side, the detection signal are zero passage detection signal.
4. adjusting control circuit according to claim 3, which is characterized in that the control circuit receives the test side and passes
The zero passage detection signal come, after when test side, electric current falls to zero, the switch element is connected in control.
5. adjusting control circuit according to claim 3, which is characterized in that the control circuit receives the test side and passes
The zero passage detection signal come after electric current falls to zero when test side, is spaced after a time of having a rest Trest and opens described in control conducting
Close element.
6. -5 any adjusting control circuit according to claim 1, which is characterized in that when the adjusting control circuit starts
When, the control circuit control respectively in order it is each it is described light modulation sub-circuit the switch element certain interval of time after successively
Conducting, interval time lengths are equal to a turn-on time of the switch element of a light modulation sub-circuit.
7. adjusting control circuit according to claim 6, which is characterized in that each light modulation sub-block circuit design is, described
The turn-off time of switch element and the ratio of turn-on time are N-1.
8. a kind of dimming controlling method, applied to the adjusting control circuit as described in claim 1-7, it is characterised in that:
Control circuit described in step A receives dimming control signal；
Control circuit described in step B sets control parameter according to dimming control signal, and the control parameter includes shutdown threshold value；
Control circuit described in step C controls the conducting of the switch element in each light modulation sub-circuit according to control parameter
And shutdown, comprising: the switch element, the control are turned off according to the comparison result of the sampled signal and the shutdown threshold value
Circuit switch element according to the detection signal conduction.
9. dimming controlling method according to claim 8, which is characterized in that in the step B, control parameter further includes stopping
Time Trest is ceased, the control circuit determines the adjusting control circuit with the first Working mould according to the dimming control signal
Formula works or with the second mode of operation, is preset with mode threshold；
When that need to dim illumination more than or equal to mode threshold, the control circuit controls the adjusting control circuit with described first
Mode of operation, the time of having a rest, Trest was set as zero, when any output loop electric current drops to zero, the control electricity
Road directly controls the conducting switch element；
When that need to dim illumination less than or equal to mode threshold, the control circuit controls the adjusting control circuit with described second
Mode of operation, time of having a rest Trest are arranged according to the dimming control signal, and value is greater than zero, when any output
When loop current drops to zero, the corresponding light modulation sub-circuit of control conducting after the time of having a rest Trest of one, the control circuit interval
In the switch element.
10. dimming controlling method according to claim 9, which is characterized in that in the step C,
When switch element described in each light modulation sub-circuit is connected after receiving the dimming control signal for the first time, the control
Circuit sequentially turns on after controlling the switch element certain interval of time of each light modulation sub-circuit respectively in order, when interval
Between length be equal to one it is described light modulation sub-circuit the switch element a turn-on time.
11. dimming controlling method according to claim 10, which is characterized in that the turn-off time of the switch element and lead
The ratio of logical time is N-1.
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| CN110099486B (en) | 2024-08-23 |
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