EP0700557B1 - Signalauswertungsschaltung für einen bewegungsmelder - Google Patents
Signalauswertungsschaltung für einen bewegungsmelder Download PDFInfo
- Publication number
- EP0700557B1 EP0700557B1 EP95911179A EP95911179A EP0700557B1 EP 0700557 B1 EP0700557 B1 EP 0700557B1 EP 95911179 A EP95911179 A EP 95911179A EP 95911179 A EP95911179 A EP 95911179A EP 0700557 B1 EP0700557 B1 EP 0700557B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- evaluation circuit
- analog
- circuit according
- digital
- 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.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/18—Prevention or correction of operating errors
- G08B29/20—Calibration, including self-calibrating arrangements
- G08B29/24—Self-calibration, e.g. compensating for environmental drift or ageing of components
- G08B29/26—Self-calibration, e.g. compensating for environmental drift or ageing of components by updating and storing reference thresholds
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
- G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
- G08B13/19—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems
Definitions
- the present invention relates to a signal evaluation circuit for one Motion sensor containing sensor, the sensor signal of a relatively large Contains direct current and a small proportion of alternating current, with means for filtering of the direct current component, with an analog / digital converter and with one Amplifier for the AC component of the sensor signal.
- a motion detector with an analog / digital converter for converting the Sensor signal is e.g. known from WO-A-93/18492.
- the sensor signal of such motion detectors is made up of a strongly scattering and temperature-dependent direct current component and from an alternating current component together.
- the direct current component which does not contribute anything to the useful signal, is not predictable and not stable in the long term, and that is the useful signal for triggering the alarm supplying AC component is approximately one per mille of the DC component and must therefore be amplified accordingly.
- the signal evaluation circuit contains a series of capacitors that act as high pass filters and filter out the DC component gradually. The remaining AC signal is then digitized and strengthened. Because of the low usage frequencies large coupling electrolytic capacitors are required for filtering, but not only expensive and electrically problematic, but which also cannot be integrated and thus a desirable design of the evaluation circuit for cost reasons enable as an integrated circuit (IC).
- the invention is now to provide an evaluation circuit that is inexpensive and is robust, and that as an integrated circuit, preferably as a system-integrated Circuit (ASIC) can be formed.
- ASIC system-integrated Circuit
- this object is achieved in that the analog / digital converter is provided for the direct / digitization of the entire sensor signal, and that the means for filtering out the DC component by means of the analog / digital converter downstream digital high pass filter are formed.
- a first preferred embodiment of the signal evaluation circuit according to the invention is characterized in that the analog / digital converter in sigma-delta Structure is formed According to a second preferred embodiment contains the analog / digital converter has a sigma-delta loop and one downstream of it Decimator. This decimator is according to another preferred embodiment executed as a counter.
- the analog / digital converter which is designed in a sigma-delta structure, meets all requirements in terms of robustness, stability and low costs, generated from the Sensor signal a bit stream from which the digital high pass filter the higher order Bits and thus any DC component removed absolutely offset-free.
- Such a thing digital high-pass filter is cheap to integrate despite the low useful frequency, so that the evaluation circuit according to the invention is excellently suited for this, in form of a system integrated circuit.
- FIG. 1 a passive one is shown as an example of a movement sensor according to the invention
- Infrared motion detector shown which is known to be located in the far infrared and body radiation contrasting with the heat radiation of the environment Appeals to people.
- the detection principle used for example pyro sensor
- the type of sensor for example pyro sensor
- the present signal evaluation circuit is rather for all types Suitable for motion detectors whose sensor signal has a large DC and has a small alternating current component.
- the passive infrared motion detector of Figure 1 contains one of the main components Optics 1, a sensor element 2 and a signal evaluation circuit 3.
- the sensor element 2 is via the optics 1 with infrared radiation IR from the room to be monitored acts upon and gives a subsequent depending on the level of the incident radiation electrical signal SS referred to as the sensor signal.
- the main components mentioned of the infrared motion detector are preferably in a common housing arranged, which on a wall or at another suitable location of the monitoring room is attached.
- the signal evaluation circuit will now be described below with reference to FIG. 2 become.
- This is designed as a system-integrated circuit (ASIC) and, as shown, contains two main blocks, namely an analog / digital converter 4 and one digital high-pass filter 5.
- the analog / digital converter 4 is a so-called sigma-delta Converter and contains a sigma-delta loop 6 and a decimator 7 which
- the main component of the sensor signal SS supplied to the ASIC 3 contains a strongly scattering and temperature-dependent direct current component of approximately 1 V, which is superimposed by an alternating current signal of 1 mV, which forms the actual useful signal and whose frequency is in the range from 0.2 to 10 Hz.
- This useful signal must be amplified in the ASIC by a factor of, for example, between a hundred and a thousand.
- the sensor signal SS is integrated in the integrator 8, the output signal of which is compared in the comparator 9 with a threshold value.
- the comparator 9 is either clocked at a clock frequency f o , as shown in the figure, or it contains a downstream clocked flip-flop (so-called D-FF).
- the clock frequency f o is also the frequency at which the sigma-delta loop 6 runs.
- the output signal of the comparator 9 is fed to the decimator 7 on the one hand and on the other hand clocks the 1-bit digital / analog converter 10 formed by a switch, which is switched between the reference voltage V ref supplied by a voltage source and the voltage Gnd.
- the voltage source supplying the reference voltage V ref is preferably also used to supply the sensor 2 (FIG. 1).
- the 1-bit digital / analog converter 10 has the effect that, in the comparator 9, the integrated sensor signal SS is only considered in the range between the voltages Gnd and V ref .
- the signal supplied to the decimator 7 has the form of a bit stream; this means that its mean value is pulse density modulated and therefore represents the analog input signal.
- the digitized sensor signal reaches the digital high-pass filter 5, which is a first-order filter and removes all DC components from the sensor signal without offset.
- amplified signal formed a digital threshold at whose If the signal is triggered, a timer is triggered that has a directly connected Relay or an optical display, for example a light emitting diode, for a specific one Time activated.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Analogue/Digital Conversion (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Burglar Alarm Systems (AREA)
- Emergency Alarm Devices (AREA)
- Geophysics And Detection Of Objects (AREA)
- Measuring Frequencies, Analyzing Spectra (AREA)
Description
Claims (8)
- Signalauswertungsschaltung für einen einen Sensor enthaltenden Bewegungsmelder, dessen Sensorsignal einen relativ grossen Gleichstrom- und einen kleinen Wechselstromanteil enthält, mit Mitteln für die Ausfilterung des Gleichstromanteils, mit einem Analog/Digital-Wandler und mit einem Verstärker für den Wechselstomanteil des Sensorsignals, dadurch gekennzeichnet, dass der Analog/Digital-Wandler (4) für die direkte Digitalisierung des gesamten Sensorsignals vorgesehen ist, und dass die Mittel für die Ausfilterung des Gleichstromanteils durch ein dem Analog/Digital-Wandler nachgeschaltetes digitales Hochpassfilter (5) gebildet sind.
- Signalauswertungsschaltung nach Anspruch 1, dadurch gekennzeichnet, dass der Analog/Digital-Wandler (4) in Sigma-Delta Struktur ausgebildet ist.
- Signalauswertungsschaltung nach Anspruch 2, dadurch gekennzeichnet, dass der Analog/Digital-Wandler (4) eine Sigma-Delta Schleife (6) und einen dieser nachgeschalteten Dezimator (7) enthält.
- Signalauswerrungsschaltung nach Anspruch 3, dadurch gekennzeichnet, dass der Dezimator (7) als Zähler ausgeführt ist.
- Signalauswertungsschaltung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die Sigma-Delta Schleife (6) aus einem vorzugsweise durch einen Operationsverstärker gebildeten Integrator (8), einem Komparator (9) und aus einem von dessen Ausgangssignal getakteten 1Bit Digital/Analog-Wandler (10) gebildet ist, durch den wahlweise eine von zwei Spannungen (Vref, Gnd) an den Integrator rückgekoppelt und dadurch der Bereich für die Betrachtung des integrierten Sensorsignals (SS) im Komparator festgelegt ist.
- Signalauswertungsschaltung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass das die Form eines Bitstroms aufweisende Ausgangssignal der Sigma-Delta Schleife (6) im Dezimator (7) in ein Parallelwort einer bestimmten Breite (n) akkumuliert wird.
- Signalauswertungsschaltung nach Anspruch 6, dadurch gekennzeichnet, dass das digitale Hochpassfilter (5) so ausgelegt ist, dass von dem zugeführten Parallelwort der bestimmten Breite (n) nur eine reduzierte Anzahl (m) der tiefsten Bits weiterverarbeitet wird.
- Signalauswertungsschaltung nach Anspruch 7, dadurch gekennzeichnet, dass auf dem als Parallelwort mit der reduzierten Bitanzahl (m) vorliegenden Signal eine digitale Schwelle gebildet wird, bei deren Überschreiten durch das Signal die Auslösung eines Alarmsignals (AS) erfolgt.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH88294 | 1994-03-24 | ||
| CH00882/94A CH689071A5 (de) | 1994-03-24 | 1994-03-24 | Signalauswertungsschaltung fuer einen Bewegungsmelder. |
| CH882/94 | 1994-03-24 | ||
| PCT/CH1995/000058 WO1995026017A1 (de) | 1994-03-24 | 1995-03-16 | Signalauswertungsschaltung für einen bewegungsmelder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0700557A1 EP0700557A1 (de) | 1996-03-13 |
| EP0700557B1 true EP0700557B1 (de) | 2000-03-01 |
Family
ID=4197379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95911179A Expired - Lifetime EP0700557B1 (de) | 1994-03-24 | 1995-03-16 | Signalauswertungsschaltung für einen bewegungsmelder |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US5659316A (de) |
| EP (1) | EP0700557B1 (de) |
| JP (1) | JPH08511349A (de) |
| CN (1) | CN1135510C (de) |
| CA (1) | CA2161878C (de) |
| CH (1) | CH689071A5 (de) |
| DE (1) | DE59507873D1 (de) |
| WO (1) | WO1995026017A1 (de) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69729767T2 (de) * | 1996-04-26 | 2005-07-14 | Hamamatsu Photonics K.K., Hamamatsu | Festkörperbildaufnahmegerät |
| US6111256A (en) * | 1997-04-10 | 2000-08-29 | Shmuel Hershkovitz & Pinhas Shpater | Infrared motion detection signal sampler |
| GB9926253D0 (en) * | 1999-11-06 | 2000-01-12 | Ademco Microtech Ltd | Improvements relating to intruder detectors |
| DE10243564B4 (de) * | 2002-09-19 | 2006-11-30 | Siemens Ag | Schaltungsanordnung zur Mittelwertbildung |
| EP1708362B1 (de) * | 2005-03-31 | 2008-12-31 | STMicroelectronics S.r.l. | Verschiebungsdetektion von einer tragbaren Vorrichtung mit einem digitalen Hochpassfilter |
| US7652609B2 (en) * | 2005-08-01 | 2010-01-26 | Samsung Electronics Co., Ltd. | Apparatus and method for detecting motion with low power consumption in inertia sensor |
| US9135962B2 (en) | 2007-06-15 | 2015-09-15 | Micron Technology, Inc. | Comparators for delta-sigma modulators |
| US7675447B1 (en) | 2008-05-24 | 2010-03-09 | Zilog, Inc. | Low-cost and noise-insensitive motion detector |
| DE102010013663A1 (de) * | 2010-04-01 | 2011-10-06 | Perkinelmer Technologies Gmbh & Co. Kg | Strahlungssensor |
| US8866655B2 (en) * | 2012-08-10 | 2014-10-21 | Infineon Technologies Ag | Modulator with variable quantizer |
| DE102013014810B4 (de) | 2013-09-05 | 2019-03-14 | Elmos Semiconductor Aktiengesellschaft | Vorrichtung zum Betreiben passiver Infrarotsensoren |
| WO2020047776A1 (zh) * | 2018-09-05 | 2020-03-12 | 上海晶丰明源半导体股份有限公司 | 低通滤波器、开关控制电路、驱动系统、芯片及方法 |
| CN114872461B (zh) * | 2022-05-07 | 2024-06-14 | 华芯科技(恩施)有限公司 | 一种智能印章管理系统及其控制方法 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2133877B (en) * | 1982-12-24 | 1986-12-03 | Rolls Royce | Generation of a signal dependent upon temperature of gas turbine rotor blades |
| US4769697A (en) * | 1986-12-17 | 1988-09-06 | R. D. Percy & Company | Passive television audience measuring systems |
| US5163438A (en) * | 1988-11-14 | 1992-11-17 | Paramed Technology Incorporated | Method and apparatus for continuously and noninvasively measuring the blood pressure of a patient |
| US5061854A (en) * | 1990-04-10 | 1991-10-29 | The United States Of America As Represented By The Secretary Of The Army | Short scan passive infrared remote sensor |
| WO1993018492A1 (en) * | 1992-03-09 | 1993-09-16 | The Commonwealth Of Australia | Infrared intrusion sensor |
-
1994
- 1994-03-24 CH CH00882/94A patent/CH689071A5/de not_active IP Right Cessation
-
1995
- 1995-03-16 EP EP95911179A patent/EP0700557B1/de not_active Expired - Lifetime
- 1995-03-16 JP JP7524273A patent/JPH08511349A/ja active Pending
- 1995-03-16 DE DE59507873T patent/DE59507873D1/de not_active Expired - Fee Related
- 1995-03-16 CN CNB951902121A patent/CN1135510C/zh not_active Expired - Fee Related
- 1995-03-16 CA CA002161878A patent/CA2161878C/en not_active Expired - Fee Related
- 1995-03-16 WO PCT/CH1995/000058 patent/WO1995026017A1/de not_active Ceased
- 1995-03-16 US US08/545,685 patent/US5659316A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0700557A1 (de) | 1996-03-13 |
| CN1135510C (zh) | 2004-01-21 |
| JPH08511349A (ja) | 1996-11-26 |
| CA2161878A1 (en) | 1995-09-28 |
| CN1124533A (zh) | 1996-06-12 |
| CH689071A5 (de) | 1998-08-31 |
| WO1995026017A1 (de) | 1995-09-28 |
| DE59507873D1 (de) | 2000-04-06 |
| CA2161878C (en) | 2003-09-16 |
| US5659316A (en) | 1997-08-19 |
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