CN102045046B - For controlling the device of pulse-width modulation - Google Patents
For controlling the device of pulse-width modulation Download PDFInfo
- Publication number
- CN102045046B CN102045046B CN201010508915.5A CN201010508915A CN102045046B CN 102045046 B CN102045046 B CN 102045046B CN 201010508915 A CN201010508915 A CN 201010508915A CN 102045046 B CN102045046 B CN 102045046B
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- Prior art keywords
- cycle
- control channel
- duration
- pulse
- width modulation
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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 the device for controlling pulse-width modulation.Suggestion has a kind of device for controlling the pulse-width modulation with cycle duration (T) given in advance, and it has multiple control channel of the power drain for controlling multiple electric load independently and the control unit for the pulse-width modulation that controls described control channel.According to the present invention, described control unit is designed to the corresponding output duration for connection signal of described control channel to be placed as in time make: within cycle duration (T), the output duration for connection signal of control channel seamlessly connects in time continuously.
Description
Technical field
The present invention relates to a kind of device for controlling pulse-width modulation, this device has the control channel of multiple power drain for controlling multiple electric load independently, in time concurrently and the control unit for the pulse-width modulation that controls described control channel.
Background technology
Being well known that can by the control device of the load of pulse-width modulation modulated light (dimmbar) for excitation (Ansteuerung) more than.
If load is in supply line, then can according to the power drain required by described load, maximum current flows through supply line, and described maximum current corresponds to the addition of all maximum currents of each load.
Occur high current gradient thus, described high current gradient causes electromagnetic interference electromotive force.
Summary of the invention
The present invention based on task be to provide a kind of control device starting described type, described control device make it possible to realize improve pulse-width modulation.
This task is solved by the present invention.
The present invention with a kind of device for controlling the pulse-width modulation with cycle duration given in advance for starting point, this device being used for controlling the pulse-width modulation with cycle duration given in advance comprises: multiple control channel, for independently, control the power drain of multiple electric load in time concurrently; And control unit, for controlling the pulse-width modulation of described control channel.Described electric load is preferably located in identical supply line.In addition, described control channel 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 the corresponding output duration for connection signal of described control channel to be placed as in time make: within cycle duration, the output duration for connection signal of the control channel of concurrent working in time seamlessly connects in time continuously.
Thus, similarly expire the in a synchronous manner cycle duration of (can say in control channel) of described control signal is seamlessly filled by with " the current turns ON block " of different control channel.By this measure, avoid switching edge, because by output duration is seamlessly put together, formed and keep identical electric current.Each switching edge causes electromagnetic interference (EMI) emissions, and described electromagnetic interference (EMI) emissions can be considerably reduced by this measure.
In another particularly preferred expansion scheme of the present invention, described control unit is configured to the corresponding output duration for connection signal of described control channel to be defined as in time making within cycle duration, have the least possible control channel to export connection signal simultaneously.In this way, the maximum current in supply line is first limited.The reduction of current gradient also occurs along with the reduction of peak current, limits the interference potential because electromagnetic radiation causes thus.If all output durations in cycle are seamlessly put together all the time and are optimized the number of the control channel maximally worked simultaneously, then can the maximum appearance current-jump corresponding with the peak current of load.Thus, when a large amount of loads that will drive, realize the great reduction to current gradient, this significantly improves electromagnetic interference electromotive force.
If there is the change of less maximum load, then can adopt and slow down a bit and the component that thus recurring cost is lower.Because described component must only implement little load jump in the same time of supposition.
Then advantageously, described control unit be designed to according to the total output duration that will expect about pulse-width modulation can cycle duration determine exporting the number exporting the control channel of connection signal in duration simultaneously.
In addition, in this advantageously, described control unit is configured to the number determining the control channel simultaneously exporting connection signal in the following way further: determine total output duration of all control channel and computing cycle duration is many is comprised in described total output duration as integer value continually, and wherein said value forms the number of driven control channel simultaneously.By this measure, calculate: in order to each load supply connection signal in required output duration, many fill cycle duration can must be carried out with the output duration stringed together of each passage continually.If setting example is as 5 loads, described 5 loads need 1/3rd of available cycle duration as turn-on time respectively in order to enough supply powers, then draw following situation: on 2/3rds of this time, two control channels export respectively simultaneously connects channel, and three/for the moment, only a control channel is movable.
Thus, peak current is two load currents to the maximum, and the change in cycle is maximum is only a load current.Therefore, interference level is lowered and is limited the loading that component carries out maximum current and greatest gradient.
Another importance of the present invention is: in order to reduce the number of slots in cycle of following one another, described control unit is configured to have output duration when the cycle starts at least one control channel and is pre-arranged on the pulse width modulation cycle duration into the connection signal shorter than pulse width modulation cycle duration, is placed as by the output duration of described control channel and makes described output duration just in time terminate at the end of described cycle duration and again start when the cycle starts in the cycle next arrived in the cycle subsequently.The curent change of each cycle when starting can be cut down thus, because by this measure, the interface point place change procedure within the cycle is identical between two cycles always has identical value to encounter one another.
If multiple output duration by accident phase Calais makes the cycle duration of pulse-width modulation be filled completely by one times or many times of ground, then form completely seamless energising, wherein utilize and completely current gradient is avoided to the corresponding active influence of interference level.
Then, advise to obtain the least possible current-jump: the replacement that output duration when the cycle starts starts or make export end that duration falls the cycle just on the cycle alternatively (alterierend) proceed.
Can imagine, these behaviors are not alternately carry out after each cycle, but alternately carry out after the cycle of number given in advance yet.This has decreased the frequency of the saltus step of appearance and has reduced interference level thus.
In of the present invention preferred in addition expansion scheme, described control unit is configured to: when the counter controls pulse-width modulation by counting down to end value given in advance in the cycle, connect control channel when the cycle starts and be less than described end value but the median place being greater than initial value disconnects described control channel given in advance, alternately start described counter from initial value in the cycle and start described counter from end value during next cycle, wherein said counter then counts down to initial value.
By described measure, such as second round is reversed respectively in time signal change curve, and the identical initial value in cycle and/or the identical end value in cycle encounter one another thus.Thus, the number of current-jump is reduced and the interference level be associated with it is reduced.
Accompanying drawing explanation
When other advantage and details are described, in the accompanying drawing enclosed, set forth multiple embodiment of the present invention further.
Fig. 1 a individually with the time changing curve of the connection signal being shown 4 single loads by the total current added up in 3 counter cycle,
Fig. 1 b shows the time changing curve of the connection signal according to pulse-width modulation as Fig. 1 a, but is divided into the corresponding cycle in time according to the present invention,
Fig. 2 a and 2b in contradistinction to shows change curve (2a) corresponding in Fig. 1 b with the change curve be reversed in time every one-period (Fig. 2 b).
Embodiment
Show the time changing curve on cycle that counter is T at 3 cycle durations in fig 1 a, wherein Counter Value rises to maximum counter value Z respectively from null value linearly
max.And then, counter is again from 0.Accordingly, zigzag change curve is depicted in fig 1 a.Each cycle duration T is equal.During described cycle duration, 4 loads are had to encourage with corresponding duty ratio individually respectively.Uppermost position in chart variation curve, the respective load electric current I relevant to the duty ratio of pulse-width modulation
1, I
2, I
3, I
4each is illustrated as block.The total current I occurred on the common circuit of load being located immediately at symbolically in the chart under it and drawing thus
1+ I
2+ I
3+ I
4.Electric 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 be 50% duty ratio.
The connection signal of 4 corresponding control channels of pulse width modulation apparatus output loading simultaneously when the cycle starts, described connection signal is until reach required duty ratio and continue always.Then, corresponding control channel disconnects this connection signal.30% the load current of 4 times is obtained, because all loads all still require electric current thus before this cycle.After 30%, two loads are disconnected, and total current is reduced to half thus, and after ensuing 50%, the 3rd load is disconnected, the 4th load until this cycle 80% all keep connect.Obtain stair-stepping change curve thus, this stair-stepping change curve have within this cycle be 4 × I(to the maximum namely respectively when the cycle starts) high voltage saltus step and other lasting voltage jump.The electromagnetic radiation disturbed as the carrying out of starting point is significant.
By the behavior by Fig. 1 b symbolically according to the present invention realize electric current in supply line obviously evenly change procedure.
Electric current I
1, I
2, I
3, I
4the connection duration corresponding with the output duration of the connection signal of pulse width modulation apparatus be not start when the cycle starts simultaneously, but be distributed as on the cycle and make: in such as electric current I
1connection duration at the end of the moment 2, electric current I
2seamlessly accessed by the corresponding control via pulse width modulation apparatus.But, electric current I
2connection duration from the moment 2, think that the duty ratio of 80% is adapted to the cycle duration of T no longer completely, therefore exceed 10% is also performed when the beginning in next cycle.Then, electric current I
3in electric current I
2seamlessly accessed at the end of the moment 1 be disconnected, and last in electric current I
3at the end of the moment 3, electric current I
4until the moment 4 is all access in.Can imagine, when seamlessly stringing together, be not perform in the mode that can be described as " foresight " the connection duration exceeding the cycle when the beginning in ensuing cycle but when the beginning of same period yet.
At that rate, as shown in below the change curve of individual signals in Figure 1b, change curve is drawn in addition.Thus, in common supply line, at I
1=I
2=I
3=I
4when, maximum current is 2I.In addition, owing to using connection duration seamlessly " filling " cycle of electric current all the time, and there is the current-jump being I to the maximum.
The single current I of total current is depicted in fig. 2 a accordingly as in Fig. 1 b
1, I
2, I
3, I
4and run to Z from 0
maxthe change curve of counter.Additionally, the cycle duration T of curent change is symbolically drawn
d.Thus, the frequency of curent change is drawn, wherein f
d=1/T
d.In Fig. 2 a and 2b, the diagram (Fig. 2 b) that the frequency of the diagram with the wherein curent change of resultant signal that correspond to Fig. 1 b is halved again is compared.According to the present invention, this carries out in the following way: every one-period, counter is not from initial value (such as 0) and upwards runs to end value (such as N), but this counter count down to minimum value (such as 0) downwards from end value (N).Thus, as by single current I
1, I
2, I
3, I
4the time changing curve of connection duration that obtains of the addition of connection duration be reversed in time, that is, time bar can be said and to be inverted for these cycles.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 encounters one another.Because signal intensity curve is identical in these not inverse cycle turnovers, therefore there is equal value to encounter one another respectively, no longer occur the saltus step in signal intensity curve thus at the crossover position place in described cycle respectively.The signal saltus step be 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 when encouraging of symbolically counter as follows in figure 2b: be alternative in now sawtooth change curve and occur triangle change curve.
Such as multiple light source, such as light-emitting diode can be used as multiple load.In this case, the actuation duration of described multiple light source is preferably selected as the brightness making the expectation drawing described light source respectively.Described control device such as may be implemented as semiconductor component, such as, be implemented as integrated switching circuit or ASIC.
Claims (1)
1. for controlling a device for the pulse-width modulation with cycle duration (T) given in advance, it has: multiple control channel, for controlling the power drain of multiple electric load independently, in time concurrently; And control unit, for controlling the pulse-width modulation of described control channel, it is characterized in that, described control unit is designed to the corresponding output duration for connection signal of described control channel to be placed as in time make: within cycle duration (T), the output duration for connection signal of the control channel of concurrent working in time seamlessly connects in time continuously.
2. device according to claim 1, it is characterized in that, described control unit is designed to the corresponding output duration for connection signal of described control channel to be placed as in time make have the least possible control channel to export connection signal within cycle duration (T) simultaneously.
3. according to the device one of aforementioned claim Suo Shu, it is characterized in that, described control unit is designed to the number determining simultaneously to export in output duration 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.
4. device according to claim 1 and 2, it is characterized in that, described control unit is designed to the number determining the control channel simultaneously exporting connection signal in the following way: determine total output duration of all passages and how computing cycle duration (T) is comprised in described total output duration as integer value continually, and wherein said value forms the number of driven control channel simultaneously.
5. for controlling a device for the pulse-width modulation with cycle duration (T) given in advance, it has: multiple control channel, for controlling the power drain of multiple electric load independently, in time concurrently; And control unit, for controlling the pulse-width modulation of described control channel, it is characterized in that, in order to reduce the gap number in cycle of arriving in succession, described control unit is configured to: have output duration when the cycle starts at least one control channel and be pre-arranged on the pulse width modulation cycle into the connection signal shorter than cycle duration, be placed as by the output duration of described control channel and described output duration just in time terminated when end cycle and again starts when the cycle starts in the cycle next arrived in the cycle subsequently.
6. device according to claim 1 or 5, is characterized in that, the output duration when the cycle starts starts and output duration just when end cycle terminate between replacement alternately proceed on the cycle.
7. device according to claim 1 or 5, it is characterized in that, described control unit is configured to: when the counter controls pulse-width modulation by counting down to end value (N) given in advance in the cycle, control channel is connected when the cycle starts, and disconnect described control channel at the given in advance median place being less than end value (N), alternately start described counter from initial value in the cycle and start described counter from end value during next cycle, wherein said counter counts down is to initial value.
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 CN102045046A (en) | 2011-05-04 |
| CN102045046B true 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 (4)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4366540B2 (en) * | 2007-09-10 | 2009-11-18 | オンキヨー株式会社 | Pulse width modulation circuit and switching amplifier using the same |
-
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 (4)
| 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 |
| 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 |
| CN102045046A (en) | 2011-05-04 |
| DE102009045625A1 (en) | 2011-04-14 |
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