CN1789700A - OR gate dual-monitoring device of SCM for preventing physical damage when repairing automobile at bottom - Google Patents
OR gate dual-monitoring device of SCM for preventing physical damage when repairing automobile at bottom Download PDFInfo
- Publication number
- CN1789700A CN1789700A CN 200510061336 CN200510061336A CN1789700A CN 1789700 A CN1789700 A CN 1789700A CN 200510061336 CN200510061336 CN 200510061336 CN 200510061336 A CN200510061336 A CN 200510061336A CN 1789700 A CN1789700 A CN 1789700A
- Authority
- CN
- China
- Prior art keywords
- circuit
- chip microcomputer
- monitoring device
- input end
- door
- 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.)
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- Geophysics And Detection Of Objects (AREA)
Abstract
This invention relates to one single machine to prevent repair person accident on chassis in computer technique application field, which comprises Fire system control circuit, infrared test circuit, thermal dissipation test circuit or gate control circuit and is characterized by the following: The infrared monitor circuit is connected to the thermal dissipation monitor circuit output end and gate circuit and single machine input end and the single input end is connected to the switch tube and relay to form single machine or double gate monitor device. The fire system is connected to the close touch point. When repair person in work, the relay touch points switches off fire system and when off work, the relay recovers original status and the indicator lamp is connected to the circuit of touch point power to provide work signals.
Description
Technical field the invention relates to a kind of circuit arrangement that monitor signal is provided, and particularly preventing nhuman casualty accident during repairing automobile bottom single-chip microcomputer or door dual-monitoring device belong to microchip technology field.
Monitoring device before background technique the invention is respectively infrared monitor, pyroelectric monitor, but do not exist monitoring accuracy high and may provide mistake to survey the defective of signal.
The purpose of summary of the invention the invention provides preventing nhuman casualty accident during repairing automobile bottom single-chip microcomputer or door dual-monitoring device.
The invention solves the technological scheme that its technical problem adopts: comprise ignition system control circuit, infrared detection circuit, thermoelectricity testing circuit and or gate control circuit; The infrared observation circuit is connected with the single-chip microcomputer input end by AND circuit with thermoelectricity observation circuit output terminal, and the single-chip microcomputer input end is connected with switching tube and relay, forms single-chip microcomputer or door double monitoring device.Ignition system is connected with normally-closed contact, and the tutorial light cross-under is in the normally opened contact power loop.The OR circuit Placement: two diode cathodes are connected with infrared detection circuit, thermoelectricity testing circuit output terminal respectively, and by resistance eutral grounding, even the door form, its negative pole parallel connected end is connected with the single-chip microcomputer input end after two diode cathode parallel connections.
The beneficial effect of the invention is: the beneficial effect of the invention is to make the repairman when the operation of automobile bottom, automatic cut-out point ignition system work loop, guarantee that the automobile false tripping causes repairman's human casualty accident, and have the accurately characteristics of control of OR circuit double monitoring.
Description of drawings is described further the invention below in conjunction with accompanying drawing.
Fig. 1 is the electrical schematic diagram of the invention.
Embodiment is consulted Fig. 1.The invention is made up of pyroelectric sensor fresnel lens, low frequency bandpass amplifier, voltage comparator; High level signal by pyroelectric monitor output.
The low frequency signal that pyroelectric sensor output is faint is coupled to VT through C
1The common-emitter amplifier of forming amplifies operational amplifier A
1The further amplifying signal of low-pass amplifier and the voltage comparator A that constitute
2In-phase input end be connected, the reference potential of comparator is by the comparative voltage of R and RP dividing potential drop decision inverting input.Voltage comparator output terminal and switching tube VT
2Be connected.In the present embodiment, B selects SD02 type pyroelectric infrared sensor for use.Fresnel lens 7801 types, VT
1-VT
2With 9014, A
1, A
2Select a slice amplifier LM358N for use.
IC
1The pulse square wave voltage of output is added in infrarede emitting diode VD
2, VD
3Two ends, drive its towards periphery spatial emission go out modulated infrared light.Infrared reflection is gone back a part by infrared receiving tube VD
4Reception also is converted to the respective quadrature time variant voltage signal, through C
4, R
5Be coupled to amplifier IC
2After amplifying, again through C
5Be input to decoder IC
3Input end, the decoding after phase inverter VT
2The output high level.
The infrared observation circuit is connected with single-chip microcomputer input end I/O (1) by AND circuit output terminal Yout with thermoelectricity observation circuit output terminal, single-chip microcomputer output terminal I/O (2) and switching tube G and relay J
1Be connected.Ignition system and normally-closed contact J
1-2Be connected, the tutorial light cross-under is at normally opened contact J
1-1In the power loop.
The present embodiment single-chip microcomputer adopts the PIC16C54 8-bit microcontroller.
OR circuit is by diode D
1, D
2Form.Output terminal is the double monitoring signal.Two diode D of OR circuit Placement
1, D
2Positive pole is connected with infrared detection circuit, thermoelectricity testing circuit output terminal respectively, two diode D
1, D
2By resistance eutral grounding, even the door form, its negative pole parallel connected end Yout is for having double monitoring signal monitoring end after the negative pole parallel connection.
Claims (3)
1, preventing nhuman casualty accident during repairing automobile bottom single-chip microcomputer or door dual-monitoring device comprise that ignition system control circuit, infrared detection circuit, thermoelectricity testing circuit reach or gate control circuit; It is characterized in that the infrared observation circuit is connected with the single-chip microcomputer input end by AND circuit with thermoelectricity observation circuit output terminal, the single-chip microcomputer input end is connected with switching tube and relay, forms single-chip microcomputer or door double monitoring device.
2, preventing nhuman casualty accident during repairing automobile bottom single-chip microcomputer according to claim 1 or door dual-monitoring device is characterized in that ignition system is connected with normally-closed contact, and the tutorial light cross-under is in the normally opened contact power loop.
3, preventing nhuman casualty accident during repairing automobile bottom single-chip microcomputer according to claim 1 or door dual-monitoring device, it is characterized in that the OR circuit Placement: two diode cathodes are connected with infrared detection circuit, thermoelectricity testing circuit output terminal respectively, pass through resistance eutral grounding after two diode cathode parallel connections, even the door form, its negative pole parallel connected end is connected with the single-chip microcomputer input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510061336 CN1789700A (en) | 2005-10-31 | 2005-10-31 | OR gate dual-monitoring device of SCM for preventing physical damage when repairing automobile at bottom |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510061336 CN1789700A (en) | 2005-10-31 | 2005-10-31 | OR gate dual-monitoring device of SCM for preventing physical damage when repairing automobile at bottom |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1789700A true CN1789700A (en) | 2006-06-21 |
Family
ID=36787776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510061336 Pending CN1789700A (en) | 2005-10-31 | 2005-10-31 | OR gate dual-monitoring device of SCM for preventing physical damage when repairing automobile at bottom |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1789700A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104503311A (en) * | 2014-12-09 | 2015-04-08 | 国网上海市电力公司 | Redundant circuit for controlling heater in distribution cabinet |
-
2005
- 2005-10-31 CN CN 200510061336 patent/CN1789700A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104503311A (en) * | 2014-12-09 | 2015-04-08 | 国网上海市电力公司 | Redundant circuit for controlling heater in distribution cabinet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |