CN102045046A - Device for controlling pulse width modulation - Google Patents
Device for controlling pulse width modulation Download PDFInfo
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- CN102045046A CN102045046A CN2010105089155A CN201010508915A CN102045046A CN 102045046 A CN102045046 A CN 102045046A CN 2010105089155 A CN2010105089155 A CN 2010105089155A CN 201010508915 A CN201010508915 A CN 201010508915A CN 102045046 A CN102045046 A CN 102045046A
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- cycle
- duration
- control channel
- width modulation
- connection signal
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- 238000000034 method Methods 0.000 description 3
- 230000006399 behavior Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005670 electromagnetic radiation Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
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- Circuit Arrangement For Electric Light Sources In General (AREA)
- Electronic Switches (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Selective Calling Equipment (AREA)
Abstract
The present invention relates to a device for controlling pulse width modulation. The invention suggests a device for controlling the pulse width modulation with a preset time period (T). The device is provided with a plurality of control channels for controlling the power consumption of multiple electrical consumers and a control unit for controlling the pulse width modulation of the control channels. According to the invention, the control unit is designed so a corresponding output time periods of the control channels, which aim at a connection signal, is placed in time, and therefore the output time periods of the control channels, which aim at the connection signal, are seamlessly adjacent with one another in time.
Description
Technical field
The present invention relates to a kind of device that is used to control pulse-width modulation as described in the preamble according to claim 1.
Background technology
Be well known that the control device that is used for the load that excitation (Ansteuerung) can be by pulse-width modulation modulated light (dimmbar) more than.
If load is in the supply line, then can be according to desired power drain to described load, the maximum current supply line that flows through, described maximum current is corresponding to the addition of all maximum currents of each load.
Occur high current gradient thus, described high current gradient causes the electromagnetic interference electromotive force.
Summary of the invention
The present invention based on task provide a kind of control device that starts described type, described control device makes it possible to realize improved pulse-width modulation.
This task solves by the feature of claim 1.
Favourable and suitable improvement project of the present invention is described in the dependent claims.
The present invention is a starting point with a kind of device that is used to control the pulse-width modulation with cycle duration given in advance, this device that is used to control the pulse-width modulation with cycle duration given in advance comprises: a plurality of control channels are used for independently, control concurrently in time the power drain of a plurality of electronics load; And control unit, be used to control the pulse-width modulation of described control channel.Described electronics load is preferably located in the identical supply line.In addition, described control channel is advantageously by clock control in the same manner, especially with identical cycle duration by clock control.
Core of the present invention is, described control unit is designed to be placed as the corresponding output duration at connection signal of described control channel feasible in time: within cycle duration, the output duration at connection signal of the control channel of concurrent working in time seamlessly joins in time continuously.
Thus, seamlessly filled by " electric current connection piece " with different control channels with similarly the expire cycle duration of (we can say on control channel) of the method for synchronization for described control signal.By this measure, avoided the switching edge, because seamlessly put together, form the electric current that keeps identical by exporting duration.Each switches the edge and all causes electromagnetic interference (EMI) emissions, and described electromagnetic interference (EMI) emissions can obviously be reduced by this measure.
In another particularly preferred expansion scheme of the present invention, the corresponding output duration at connection signal that described control unit is configured described control channel is defined as making have the least possible control channel to export connection signal simultaneously in time within cycle duration.In this way, at first limit maximum current in the supply line.The reducing of current gradient also occurs along with reducing of peak current, and restriction is because the interference potential that electromagnetic radiation causes thus.If all output durations in cycle are seamlessly put together all the time and the number of the control channel that optimization is simultaneously worked the biglyyest, the corresponding current-jump of peak current with load then can maximumly appear.Thus, under the situation of a large amount of loads that will drive, realization reduces greatly to current gradient, and this significantly improves the electromagnetic interference electromotive force.
If less maximum load changes, then can adopt and slow down a bit and thereby the lower member of recurring cost.Because described member must only be implemented little load saltus step in the identical time of supposition.
Then advantageously, described control unit is designed the number of determining to export simultaneously the control channel of connection signal according to the total output duration that will expect about the available cycle duration of pulse-width modulation in the output duration.
In addition, in this advantageously, described control unit further is configured definite in the following way number of exporting the control channel of connection signal simultaneously: determine how total output duration of all control channels and computing cycle duration are comprised in described total output duration as integer value continually, wherein said value constitutes the number of driven control channel simultaneously.By this measure, we can say to calculate: supply with connection signal in order be in desired output duration to give each load, must more than come the fill cycle duration with the output duration that strings together of each passage continually.If for example 5 loads are set, described 5 loads need respectively for enough supply powers available cycle duration 1/3rd as turn-on time, then draw following situation: this time 2/3rds on, two control channels are exported simultaneously respectively and are connected channel, and three/for the moment, only a control channel is movable.
Thus, peak current is two load currents to the maximum, and the variation maximum in cycle only is a load current.Therefore, interference level is lowered and the loading that member carries out maximum current and greatest gradient is limited.
Another importance of the present invention is: the control unit that is used for reducing each other the number of slots in cycle in succession is configured to have the output duration at least one control channel and is set in advance pulse width modulation cycle duration into the connection signal shorter than pulse width modulation cycle duration when the cycle begins, and the output duration of described control channel is placed as to make described output duration just in time finish when described cycle duration finishes and start when the cycle begins once more in the cycle that next arrives in the cycle subsequently.Can cut down the electric current of each cycle when beginning thus and change, because by this measure, the interface point place under the identical situation of the change procedure within the cycle between two cycles always has identical value to meet each other.
If a plurality of output durations phase Calais by accident make the cycle duration of pulse-width modulation by one times or many times ground complete filling, then form seamless energising fully, wherein utilize the corresponding active influence of interference level is avoided current gradient fully.
Then, advise in order to obtain the least possible current-jump: replacement that the output duration when the cycle begins starts or the end that makes the output duration fall the cycle just change ground (alterierend) and proceed on the cycle.
Can imagine, these behaviors are not alternately to carry out after each cycle, but alternately carry out after the cycle of number given in advance yet.This has reduced the frequency of the saltus step that occurs and has reduced interference level thus.
In of the present invention preferred in addition expansion scheme, described control unit is configured and: under the situation of the counter controls pulse-width modulation by counting down to end value given in advance in the cycle, when the cycle starts, connect control channel and still disconnect described control channel less than described end value greater than the median place of initial value in given in advance, alternately start described counter and start described counter from end value during following one-period from initial value in the cycle, wherein said counter then counts down to initial value.
By described measure, for example be reversed aspect the time signal change curve respectively second round, the identical end value in the identical initial value in cycle and/or cycle is met each other thus.Thus, the number of current-jump is reduced and the interference level that interrelates with it is reduced.
Description of drawings
Under the situation of other advantage of explanation and details, in the accompanying drawing of enclosing, further set forth a plurality of embodiment of the present invention.
Fig. 1 a is individually with being shown the time changing curve of connection signal on 3 counter cycle of 4 single loads by the total current that added up to,
Fig. 1 b shows the time changing curve according to the connection signal of pulse-width modulation as Fig. 1 a, still be divided into the corresponding cycle in time according to the present invention,
Fig. 2 a and 2b and the change curve (Fig. 2 b) that is reversed in time every one-period show corresponding change curve (2a) among Fig. 1 b with contrasting.
Embodiment
The time changing curve of counter on the cycle that 3 cycle durations are T has been shown in Fig. 1 a, and wherein Counter Value rises to maximum counter value Z respectively from null value linearly
MaxAnd then, counter is once more since 0.Accordingly, in Fig. 1 a, described the zigzag change curve.Each cycle duration T equates.During the cycle duration of being described, there are 4 loads recently to encourage with corresponding duty individually respectively.Uppermost position in the chart variation curve, the respective load electric current I relevant with the duty ratio of pulse-width modulation
1, I
2, I
3, I
4Each is illustrated as piece.The total current I that on the common circuit of load, occurs that symbolically draws thus in the chart under being located immediately at it
1+ I
2+ I
3+ I
4Electric current I
1And I
4Corresponding to pulse-width modulation be 30% duty ratio, electric current I
2Corresponding to pulse-width modulation be 80% duty ratio, and electric current I
3Corresponding to pulse-width modulation is 50% duty ratio.
The connection signal of corresponding 4 control channels of pulse width modulation apparatus output loading simultaneously when the cycle begins, described connection signal continues till reaching desired duty ratio always.Then, corresponding control channel disconnects this connection signal.Obtain 4 times load current in preceding 30% of this cycle thus, because all loads all still require electric current.After 30%, two loads are disconnected, and total current is reduced to half thus, and after ensuing 50%, the 3rd load is disconnected, and the 4th load all kept connecting until 80% of this cycle.Obtain stair-stepping change curve thus, this stair-stepping change curve has the high voltage saltus step that is 4 * I (promptly respectively when the cycle begins) to the maximum and other lasting voltage jump within this cycle.The electromagnetic radiation of disturbing as starting point is significant.
By the obviously more uniform change procedure of realizing the electric current in the supply line by the behavior of Fig. 1 b symbolically according to the present invention.
Electric current I
1, I
2, I
3, I
4The corresponding connection duration of output duration with the connection signal of pulse width modulation apparatus be not when the cycle begins, to start simultaneously, but on the cycle, be distributed as feasible: in for example electric current I
1The connection duration constantly 2 when finishing, electric current I
2By seamlessly being inserted via the corresponding control of pulse width modulation apparatus.But, electric current I
2The connection duration from constantly 2 thinking that 80% duty ratio is adapted to the cycle duration of T no longer fully, what therefore exceed 10% also is performed when the beginning in next cycle.Then, electric current I
3In electric current I
2The moment 1 that is disconnected is seamlessly inserted when finishing, and at last in electric current I
3When 3 end constantly, electric current I
4Until 4 all being access in constantly.Also can imagine, under situation about seamlessly stringing together, not be when the beginning in ensuing cycle but carry out the connection duration that exceeds the cycle in the mode that can be described as " foresight " during beginning in same period.
At that rate, as shown in below the change curve of the individual signals among Fig. 1 b like that, draw change curve ∑ I in addition
(1..4)Thus, in common supply line, at I
1=I
2=I
3=I
4Situation under, maximum current is 2I.In addition, because the connection duration of using electric current all the time " filling " cycle seamlessly, and the current-jump of I appears being to the maximum.
As among Fig. 1 b, describing total current ∑ I among Fig. 2 a accordingly
(1..4)Single current I
1, I
2, I
3, I
4And run to Z from 0
MaxThe change curve of counter.Additionally, symbolically draw the cycle duration T that electric current changes
DThus, draw the frequency that electric current changes, wherein f
D=1/T
DIn Fig. 2 a and 2b, will be corresponding to the diagram of Fig. 1 b and resultant signal ∑ I wherein
(1..4)The diagram (Fig. 2 b) that is halved again of the frequency that changes of electric current compare.According to the present invention, this carries out in the following way: every one-period, counter is not from initial value (for example 0) beginning and upwards runs to end value (for example N), but this counter is from end value (N) beginning and count down to minimum value (for example 0) downwards.Thus, as by single current I
1, I
2, I
3, I
4The time changing curve of the connection duration that obtains of the addition of connection duration be reversed in time, that is to say that the time bar be we can say for these cycles and is inverted.Thus, the end value of period 1 and the end value of second round are met, and the initial value of the initial value of second round and period 3 is met each other.Because the signal change curve is identical in these cycles that do not have to reverse, and therefore has equal value to meet each other respectively, no longer occurs the saltus step in the signal change curve thus respectively at the crossover position place in described cycle.The signal saltus step that is present within the cycle only just occurs every one-period, and interfering frequency is halved thus.
The change curve that is reversed in time every one-period in when excitation of symbolically counter as follows in Fig. 2 b: be alternative in the sawtooth change curve now and the triangle change curve occurs.
For example a plurality of light sources, for example light-emitting diode can be used as a plurality of loads.In this case, the actuation duration of described a plurality of light sources preferably is selected as drawing the brightness of the expectation of described light source respectively.Described control device for example may be implemented as semiconductor component, for example is implemented as integrated switching circuit or ASIC.
Claims (8)
1. device that is used to control pulse-width modulation with cycle duration given in advance (T), it has: a plurality of control channels are used for independently, control concurrently in time the power drain of a plurality of electric load; And control unit, be used to control the pulse-width modulation of described control channel, it is characterized in that, described control unit is designed to be placed as the corresponding output duration at connection signal of described control channel feasible in time: within cycle duration (T), the output duration at connection signal of the control channel of concurrent working in time seamlessly joins in time continuously.
2. device according to claim 1, it is characterized in that described control unit is designed the corresponding output duration at connection signal with described control channel and is placed as in time makes have the least possible control channel to export connection signal simultaneously within cycle duration (T).
3. according to the described device of one of aforementioned claim, it is characterized in that described control unit is designed the number of determining to export simultaneously the control channel of connection signal according to the total output duration that will expect about the available cycle duration (T) of pulse-width modulation in the output duration.
4. according to the described device of one of aforementioned claim, it is characterized in that, described control unit is designed definite in the following way number of exporting the control channel of connection signal simultaneously: determine how total output duration of all passages and computing cycle duration (T) are comprised in described total output duration as integer value continually, and wherein said value constitutes the number of driven control channel simultaneously.
5. according to the device as described in the preamble of claim 1, it is characterized in that, the control unit that is used for the slit number in cycle of reducing to arrive in succession is configured: have the output duration at least one control channel when the cycle begins and be set in advance pulse width modulation cycle into the connection signal shorter than cycle duration, in the cycle subsequently the output duration of described control channel is placed as and makes described output duration just in time finish and start when the cycle begins once more in the cycle that next arrives when end cycle.
6. according to the described device of one of aforementioned claim, it is characterized in that the replacement between the output duration when the cycle begins starts and the output duration when end cycle finishes is just alternately proceeded on the cycle.
7. according to the described device of one of aforementioned claim, it is characterized in that, described control unit is configured and: under the situation of the counter controls pulse-width modulation by counting down to end value given in advance (N) in the cycle, when starting, connects control channel in the cycle, and disconnect described control channel at the median place less than end value (N) given in advance, alternately start described counter and start described counter from end value during following one-period from initial value in the cycle, wherein said counter counts down to initial value.
8. device that is used to control pulse-width modulation with cycle duration given in advance (T), it has a plurality of control channels, described a plurality of control channel is used for independently, control the power drain of a plurality of electric load in time concurrently, wherein control unit is controlled the pulse-width modulation of described control channel, it is characterized in that, described control unit is placed as the corresponding output duration at connection signal of described control channel feasible in time: within cycle duration (T), the output duration at connection signal of the control channel of concurrent working in time seamlessly joins in time continuously.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009045625A DE102009045625A1 (en) | 2009-10-13 | 2009-10-13 | Device for controlling pulse width modulation, has multiple control channels for controlling power consumption of multiple electrical consumers, where control unit is provided for controlling pulse width modulation of control channels |
| DE102009045625.2 | 2009-10-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102045046A true CN102045046A (en) | 2011-05-04 |
| CN102045046B CN102045046B (en) | 2015-09-02 |
Family
ID=43734493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010508915.5A Active CN102045046B (en) | 2009-10-13 | 2010-10-12 | For controlling the device of pulse-width modulation |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN102045046B (en) |
| DE (1) | DE102009045625A1 (en) |
| FR (1) | FR2951338B1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19732828A1 (en) * | 1997-07-30 | 1999-02-04 | Siemens Ag | PWM address circuit for light-emitting diode array |
| CN1829398A (en) * | 2005-02-02 | 2006-09-06 | 电灯专利信托有限公司 | Method and system for adjusting brightness of light source |
| CN101295929A (en) * | 2007-04-24 | 2008-10-29 | 卡特姆·德维勒克有限责任两合公司 | Semiconductor switch with integrated delay circuit |
| US20090066377A1 (en) * | 2007-09-10 | 2009-03-12 | Yoshinori Nakanishi | Pulse width modulation circuit and switching amplifier using the same |
| CN101547540A (en) * | 2008-03-07 | 2009-09-30 | 凹凸电子（武汉）有限公司 | Backlight controller, method for driving light sources, and display system |
-
2009
- 2009-10-13 DE DE102009045625A patent/DE102009045625A1/en active Pending
-
2010
- 2010-10-11 FR FR1058215A patent/FR2951338B1/en active Active
- 2010-10-12 CN CN201010508915.5A patent/CN102045046B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19732828A1 (en) * | 1997-07-30 | 1999-02-04 | Siemens Ag | PWM address circuit for light-emitting diode array |
| CN1829398A (en) * | 2005-02-02 | 2006-09-06 | 电灯专利信托有限公司 | Method and system for adjusting brightness of light source |
| CN101295929A (en) * | 2007-04-24 | 2008-10-29 | 卡特姆·德维勒克有限责任两合公司 | Semiconductor switch with integrated delay circuit |
| US20090066377A1 (en) * | 2007-09-10 | 2009-03-12 | Yoshinori Nakanishi | Pulse width modulation circuit and switching amplifier using the same |
| CN101547540A (en) * | 2008-03-07 | 2009-09-30 | 凹凸电子（武汉）有限公司 | Backlight controller, method for driving light sources, and display system |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2951338A1 (en) | 2011-04-15 |
| FR2951338B1 (en) | 2019-05-10 |
| DE102009045625A1 (en) | 2011-04-14 |
| CN102045046B (en) | 2015-09-02 |
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