EP2999968A1 - Verfahren und schaltung zur bewertung pulsweitenmodulierter signale - Google Patents
Verfahren und schaltung zur bewertung pulsweitenmodulierter signaleInfo
- Publication number
- EP2999968A1 EP2999968A1 EP14720075.2A EP14720075A EP2999968A1 EP 2999968 A1 EP2999968 A1 EP 2999968A1 EP 14720075 A EP14720075 A EP 14720075A EP 2999968 A1 EP2999968 A1 EP 2999968A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- microcontroller
- pulse width
- width modulated
- evaluated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000001419 dependent effect Effects 0.000 claims abstract description 29
- 238000011156 evaluation Methods 0.000 claims description 16
- 230000000630 rising effect Effects 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
- G01R29/027—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values
- G01R29/0273—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values the pulse characteristic being duration, i.e. width (indicating that frequency of pulses is above or below a certain limit)
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
- G01R29/023—Measuring pulse width
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
- G01R29/027—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values
- G01R29/0276—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values the pulse characteristic being rise time
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0892—Details related to signal analysis or treatment; presenting results, e.g. displays; measuring specific signal features other than field strength, e.g. polarisation, field modes, phase, envelope, maximum value
Definitions
- the invention relates to a method for evaluating pulse width modulated signals and a circuit for evaluating pulse width modulated signals.
- signals provided by a signal source must be transmitted to a microcontroller for evaluation and further processing. It already belongs to the state of the art to transmit signals as pulse width modulated signals. It is important to monitor or evaluate the signal quality of a pulse width modulated signal. From practice, sensors are known which provide an inverted pulse width modulated signal in addition to the actual pulse width modulated signal to be evaluated, the pulse width modulated signal and the inverted pulse width modulated signal being provided via separate signal lines to a microcontroiier. The Mikrocontroiier can then evaluate the signal quality of the pulse width modulated signal by evaluating the pulse width modulated signal and the inverted pulse width modulated signal. However, the provision of an additional signal line for the transmission of the inverted pulse width modulated signal requires a higher device complexity and is therefore disadvantageous.
- a method and a circuit for evaluating a pulse-width-modulated signal are known, in which a signal source on the one hand to a first channel a pulse width modulated signal and on the other hand on a second channel provides an inverted, pulse width modulated signal, and wherein with help a difference generator and a complex evaluation circuit on the basis of the pulse width modulated signal and the inverted pulse width modulated signal, the signal quality of the pulse width modulated signal is evaluated.
- the object of the present invention is to provide a novel method for evaluating pulse width modulated signals and a circuit for evaluating pulse width modulated signals.
- the pulse-width-modulated signal to be evaluated is applied to a voltage divider in order to generate from the pulse width modulated signal to be evaluated the signal dependent thereon, wherein the microcontroller on the one hand to the pulse width modulated signal to be evaluated and on the other dependent on the same Signal are each a time interval between signal edges of the respective signal to be determined, and wherein the signal evaluation is made on the basis of a difference between the time interval of the signal edges on the pulse width modulated signal to be evaluated and the time interval of the signal edges on the signal dependent therefrom.
- only one voltage divider is required to evaluate a pulse-width-modulated primary signal provided by a signal source, which generates a secondary signal dependent thereon from the pulse-width-modulated primary signal to be evaluated, the primary signal to be evaluated and the one generated by the voltage divider being dependent thereon Secondary signal to be applied to two different inputs of the microcontroiler.
- the microcontroller determines the time interval between signal edges of these signals and evaluates the signal quality of the primary signal on the basis of a difference between the time interval of the signal edges at the pulse width modulated primary signal to be evaluated and the time interval of the signal edges at the same dependent secondary signal. It is therefore not necessary that the signal source provides an inverted pulse width modulated signal via its own signal line on the microcontroller.
- a signal dependent thereon or the secondary signal is generated via a simple voltage divider from the pulse-width-modulated signal or the primary signal to be evaluated, the primary signal and the secondary signal being provided at separate inputs of the microcontroiler be so that then the microcontroller can evaluate signal edges on the secondary signal and the primary signal to evaluate the signal quality of the pulse width modulated primary signal.
- the difference between the time interval of the signal edges at the pulse width modulated signal to be evaluated and the primary signal and the time interval of the signal edges at the same dependent signal or the secondary signal is relatively small, then a good signal quality of the evaluated, closed pulse width modulated signal, wherein, when the difference between the time interval of the signal edges to be evaluated, the pulse width modulated signal and the primary signal and the time interval of the signal edges at the dependent of the same signal or the secondary signal is relatively large, a poor signal quality of to be evaluated, pulse width modulated signal is closed.
- This evaluation of the signal quality of the pulse width modulated signal is simple and reliable.
- the time interval between a falling signal edge and a rising signal edge is detected, in which case it is concluded that there is a falling signal edge, when a relatively high signal level drops below a first limit value, and then it is concluded that there is a rising signal edge, when a relatively low signal level above a second threshold greater than the first threshold increases.
- a voltage divider is connected to the microcontroller, which generates the same dependent signal from the pulse width modulated signal to be evaluated, the microcontroller each having a time interval between signal edges of the respective one on the pulse width modulated signal to be evaluated and on the signal dependent thereon Signal determined, and wherein the microcontroller signal evaluation on Basis of a difference between the time interval of the signal edges at the pulse-width-modulated signal to be evaluated and the time interval of the signal edges at the signal dependent thereon.
- the circuit allows a simple and reliable evaluation of the signal quality of a pulse width modulated signal with low device complexity.
- the voltage divider in series electrical resistances, which are connected to the microcontroller and the signal source such that a first electrical resistance of the series connection between the first input of the microcontroller and the second input of the microcontroller and a second electrical resistance of Series connection between the second input of the microcontroller and a ground terminal of the microcontroller is connected, wherein the ground terminal of the microcontroller and a ground terminal of the signal source are short-circuited, and wherein between a signal output of the signal source and the first input of the microcontroller, a further electrical resistance is connected.
- the execution is very simple.
- a first capacitor is connected in parallel with the electrical resistors of the voltage divider, wherein between the ground terminal of the signal source and the signal output of the signal source, a second capacitor is connected, and wherein a voltage supply on the one hand to a voltage supply terminal of the signal source and on the other hand with the interposition of another electrical Resistor connected to the signal output of the signal source.
- the first input of the microcontroller and the second input of the microcontroller are designed as analog-to-digital converter inputs with timer unit, wherein the first input of the microcontroller and the second input of the microcontroller within a tolerable tolerance band high levels and Low level.
- This allows a particularly accurate evaluation of the signal quality of a pulse width modulated signal.
- FIG. 1 shows a circuit according to the invention for evaluating a pulse width modulated signal.
- FIG. 2 is a first diagram to illustrate the operation of the circuit according to the invention.
- Fig. 3 is a second diagram to illustrate the operation of the circuit according to the invention.
- the present invention relates to a method for evaluating a pulse width modulated signal and a circuit for carrying out the method.
- FIG. 1 shows a preferred exemplary embodiment of a circuit 1 for evaluating a pulse-width-modulated signal which serves to carry out the method according to the invention, details of the method according to the invention being described below with reference to the circuit of FIG.
- the circuit 1 for evaluating a pulse-width-modulated signal has a signal source 2, which provides a pulse-width-modulated signal to be evaluated or a primary signal at a signal output 3.
- the signal source 2 may be, for example, a sensor installed in a vehicle transmission.
- the signal source 2 which provides the pulse-width-modulated signal to be evaluated to the signal output 3, has an antenna connection 4 and a voltage supply connection 5, wherein the mass sean gleich 4 to ground potential 6 and the power supply terminal 5 is connected to a power supply potential 7.
- the circuit 1 furthermore has a microcontroller 8.
- the microcontroller 8 has, in addition to a ground connection 9, which is short-circuited to the ground connection 4 of the signal source 2 and connected to ground potential 6, via at least two inputs 10 and 11.
- a first input 10 of the microcontroller 8 the pulse-width-modulated primary signal 14 of the signal source 2 to be evaluated is applied, an electrical resistor 12 being connected between the signal output 3 of the signal source 2 and the first input 10 of the microcontroller 8 as shown in FIG.
- a pulse width modulated primary signal secondary signal To a second input 1 1 of the microcontroller 9 is applied to be evaluated by a pulse width modulated primary signal secondary signal, this applied to the second input 1 1, is provided by the evaluated, pulse width modulated signal signal via a voltage divider 13.
- the voltage divider 13 is connected to the microcontroller 8 in such a way that the actual pulse-modulated primary signal, which is provided by the signal source 2 at the signal output 3, is present at the first input 10, whereas at the second terminal 1 1 a signal derived from this signal is applied .
- Dependent secondary signal is applied.
- the microcontroller 8 determines, on the one hand, a time interval between signal edges of the respective signal, which is applied to the input 1, applied by the same dependent secondary signal 15 to the first input 10 to be evaluated, pulse width modulated primary signal 14, the microcontroller 8, the signal evaluation on Based on a difference between the time interval of the signal edges of the primary signal 14 and the time interval of the signal edges of the secondary signal 15 performs.
- This signal evaluation of the pulse width modulated signal will be described below with reference to FIGS. 2 and 3.
- curves of signal voltages U of the pulse-width-modulated signal or primary signal 14 to be evaluated, and of the signal or secondary signal 15 generated via the voltage divider 13 are plotted over time t in FIGS. 2 and 3.
- the primary signal 14 is located at the first input 10 of the microphone. Rocontrollers 8 and the secondary signal 15 at the second input 1 1 of the microcontroller 8 on.
- microcontroller 8 determines, on the one hand, primary signal 14 and, on the other hand, secondary signal 15, a time interval between signal edges of the respective signal, namely time intervals t14 and t15 between falling signal edges and rising signal edges of signals 14 and 1 in FIGS the time interval t14 corresponds in each case to the time interval between a falling signal edge of the primary signal 14 and a rising signal edge of the primary signal 14, whereas the time interval t15 corresponds to the time interval between a falling signal edge of the secondary signal 15 and a rising signal edge of the secondary signal 15.
- the microcontroller 8 detects a difference between these time intervals t14 and t15. Then, when the difference between the time interval t14 of the signal edges of the primary signal 14 and the time interval t1 5 of the signal edges of the secondary signal 15 of FIG. 2 is relatively small, good signal quality of the pulse width modulated signal 14 to be evaluated is concluded, whereas if the difference between the time interval t14 of the signal edges of the primary signal 14 and the time interval t1 5 between the signal edges of the secondary signal 15 according to FIG. 3 is relatively large, a poor signal quality of the pulse-width-modulated signal 14 to be evaluated is concluded.
- the time interval t14 or t15 a falling signal edge and a rising signal edge is respectively detected at the terminals 10 and 1 1 of the microcontroller 8, that is then closed to a falling signal edge, starting from a relatively high signal level, the respective signal 14 or 1 5 falls below a first limit value Low, whereas it is then concluded that there is a rising signal edge of the respective signal 14 or 15, if it rises from a low signal level above a second limit High, which is greater than the first limit Low.
- the two inputs 10 and 1 1 of the microcontroller 8 are analog-to-digital converter inputs with timer unit, wherein the first input 10 and the second input 1 1 of the microcontroller each have high level and low level, which are approximately identical, which are thus within an allowable tolerance band.
- the inventively provided voltage divider 13 has a series circuit of electrical resistors 1 6 and 17.
- a first electrical resistance 1 6 of the voltage divider 13 is connected between the first input 10 and the second input 1 1 of the microcontroller 8.
- a second electrical resistance 17 of the voltage divider 13 is connected between the second input 1 1 and the ground terminal 9 of the microcontroller 8.
- the ground connections 4 and 9 of the signal source 2 and of the microcontroller 8 are short-circuited and connected to the ground potential 6.
- the electrical resistance 12 is connected between the signal output 3 of the signal source 2 and the first input 10 of the microcontroller 8.
- a first capacitor 18 is connected in parallel with the voltage divider 13 and a second capacitor 19 is connected between the signal output 3 and the ground terminal 4 of the signal source 2.
- the voltage supply potential 7 is connected directly to the voltage supply connection 5 of the signal source 2, whereby a further electrical resistance 20 is connected between the voltage supply source 7 and the signal output 3 of the signal source 2.
- a signal source 2 at a signal output 3 thereof provides a pulse-width-modulated primary signal to be evaluated, this primary signal to be evaluated being applied to a first input 10 of a microcontroller 8.
- a voltage divider 13 Connected to the microcontroller 8 is a voltage divider 13 which, depending on the primary signal, generates a secondary signal and applies it to the second input 1 1 of the microcontroller 8.
- These two inputs 10 and 1 1 of the microcontroller 8 are each analog-to-digital converter inputs with timer unit, which have almost identical high level and low level.
- the microcontroller 8 determines the signals, ie the primary signal and the secondary signal, respectively time intervals t14 and t15 between the falling signal edges and the rising signal edges of the signals, wherein a difference of these time intervals, the evaluation of the signal quality of the primary signal or the pulse width modulated signal takes place. As the difference between these intervals increases, the signal quality degrades. The smaller the difference, the higher the signal quality.
- the difference between the above time intervals is greater than a threshold value, it can be concluded that a faulty primary signal.
- this difference is smaller than a limit value, then a non-faulty primary signal can be deduced.
- the above signal evaluation of the pulse-width-modulated signal can also be used for a trend analysis, in particular in such a way that an aging of the signal source is concluded by a successive enlargement of the above difference between the time intervals of the signal edges of the primary signal and the secondary signal.
- a signal correction of the primary signal can also take place.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Manipulation Of Pulses (AREA)
- Dc Digital Transmission (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102013209309.8A DE102013209309A1 (de) | 2013-05-21 | 2013-05-21 | Verfahren und Schaltung zur Bewertung pulsweitenmodulierter Signale |
| PCT/EP2014/058178 WO2014187630A1 (de) | 2013-05-21 | 2014-04-23 | Verfahren und schaltung zur bewertung pulsweitenmodulierter signale |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2999968A1 true EP2999968A1 (de) | 2016-03-30 |
Family
ID=50624559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP14720075.2A Withdrawn EP2999968A1 (de) | 2013-05-21 | 2014-04-23 | Verfahren und schaltung zur bewertung pulsweitenmodulierter signale |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US9638732B2 (de) |
| EP (1) | EP2999968A1 (de) |
| CN (1) | CN105229478B (de) |
| DE (1) | DE102013209309A1 (de) |
| WO (1) | WO2014187630A1 (de) |
Family Cites Families (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3371280A (en) * | 1964-08-18 | 1968-02-27 | John L. Gill Jr. | Precision signal processor for pulse duration modulation telemetry |
| US3961271A (en) * | 1975-02-07 | 1976-06-01 | International Telephone And Telegraph Corporation | Pulse width and amplitude screening circuit |
| US4339723A (en) * | 1978-09-13 | 1982-07-13 | The Bendix Corporation | Pulse width discriminator |
| DE3103282A1 (de) | 1981-01-31 | 1982-09-16 | Microtec Electronic GmbH, 8033 Martinsried | Schaltungsanordnung zur eliminierung von stoereinfluessen bei der messung des impuls-pause-verhaeltnisses von impulsfolgen |
| DE3120622C2 (de) | 1981-05-23 | 1983-02-17 | Rohde & Schwarz GmbH & Co KG, 8000 München | Logikanalysator |
| US4413260A (en) * | 1981-08-31 | 1983-11-01 | Stern Electronics, Inc. | Remote-control system for coin-operated phonographs |
| GB2156612B (en) | 1984-03-23 | 1986-12-03 | Secr Defence | Pulse amplitude analyser circuits |
| US4745365A (en) * | 1986-12-31 | 1988-05-17 | Grumman Aerospace Corporation | Digital receiver with dual references |
| JPH0735142B2 (ja) | 1988-05-24 | 1995-04-19 | 日本電装株式会社 | 車両用乗員保護システムのための故障判断装置 |
| US4904947A (en) * | 1988-11-09 | 1990-02-27 | Tideland Signal Corporation | Method and circuit for measuring pulse width |
| US5640315A (en) * | 1994-03-18 | 1997-06-17 | Nippon Steel Corporation | Switching regulator |
| US6292507B1 (en) * | 1999-09-01 | 2001-09-18 | Lexmark International, Inc. | Method and apparatus for compensating a spread spectrum clock generator |
| DE10119471A1 (de) * | 2001-04-20 | 2002-10-31 | Micronas Gmbh | Verfahren und Zweidrahtsensor zur Messung einer physikalischen Größe |
| JP4266350B2 (ja) * | 2004-02-12 | 2009-05-20 | 株式会社ルネサステクノロジ | テスト回路 |
| ATE441120T1 (de) * | 2004-07-07 | 2009-09-15 | Verigy Pte Ltd Singapore | Auswertung eines ausgangssignals eines gerade geprüften bausteins |
| DE102007030589A1 (de) | 2007-06-27 | 2009-01-02 | Siemens Ag | Verfahren und Schaltung zur mehrkanaligen Fehlerbewertung von Mess- oder Prozessgrößen |
| US7812590B2 (en) * | 2007-09-17 | 2010-10-12 | Infineon Technologies Ag | Method for detection of the presence of a load and drive circuit |
| CN101303377B (zh) * | 2008-06-11 | 2011-08-10 | 成都南迪测量科技有限公司 | 放电辐射脉冲的参数化采集方法 |
| TWI374002B (en) | 2008-07-23 | 2012-10-01 | Htc Corp | Electronic device |
| TW201005461A (en) * | 2008-07-31 | 2010-02-01 | Richtek Technology Corp | Voltage regulator and control method thereof |
| JP5218535B2 (ja) * | 2010-12-09 | 2013-06-26 | 横河電機株式会社 | パルス信号受信装置及び伝送システム |
| DE102014102424A1 (de) * | 2014-02-25 | 2015-08-27 | Robert Bosch Automotive Steering Gmbh | Verfahren zum Betreiben eines Lenksystems |
-
2013
- 2013-05-21 DE DE102013209309.8A patent/DE102013209309A1/de active Pending
-
2014
- 2014-04-23 EP EP14720075.2A patent/EP2999968A1/de not_active Withdrawn
- 2014-04-23 WO PCT/EP2014/058178 patent/WO2014187630A1/de not_active Ceased
- 2014-04-23 US US14/892,600 patent/US9638732B2/en not_active Expired - Fee Related
- 2014-04-23 CN CN201480028875.0A patent/CN105229478B/zh active Active
Non-Patent Citations (2)
| Title |
|---|
| None * |
| See also references of WO2014187630A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US9638732B2 (en) | 2017-05-02 |
| WO2014187630A1 (de) | 2014-11-27 |
| CN105229478B (zh) | 2018-03-23 |
| DE102013209309A1 (de) | 2014-11-27 |
| CN105229478A (zh) | 2016-01-06 |
| US20160084897A1 (en) | 2016-03-24 |
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