CN201917632U - Signal input dropout detection alarm device - Google Patents
Signal input dropout detection alarm device Download PDFInfo
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- CN201917632U CN201917632U CN 201020688694 CN201020688694U CN201917632U CN 201917632 U CN201917632 U CN 201917632U CN 201020688694 CN201020688694 CN 201020688694 CN 201020688694 U CN201020688694 U CN 201020688694U CN 201917632 U CN201917632 U CN 201917632U
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Abstract
The utility model discloses a signal input dropout detection alarm device, which comprises a comparison circuit, a time-delay trigger circuit and an alarm indicating circuit, wherein the output end of the comparison circuit is connected with the input end of the time-delay trigger circuit and the output end of the time-delay trigger circuit is connected with the input end of the alarm indicating circuit. The signal input dropout detection alarm device has the advantages that the status of signal detection can be displayed, an intuitive basis is provided for judging whether a signal detection part is in good connection with a processing circuit after the signal detection part or not, the structure is simple, the cost is low, the device is easy to realize, the stability is high and the effect of suppressing all kinds of interference signals is good.
Description
Technical field
The utility model relates to the signal detection technique field, relates in particular to a kind of signal input detection alarm device that comes off.
Background technology
Input normally utilizes sensors of various types that detected conversion of signals is electric signal, then the electric signal that detects is carried out back conditioning and measurement.Whether yet whether in the middle of the actual measurement, well be connected with thereafter treatment circuit owing to can't determine sensor, it is effective to judge the signal that detects.
The utility model content
The purpose of this utility model provides a kind of signal input detection alarm device that comes off, and can demonstrate the state of input, for judging partly whether good being connected provides foundation intuitively to input with thereafter treatment circuit.
To achieve these goals, the utility model is by the following technical solutions:
A kind of signal input detection alarm device that comes off, wherein, comprise comparator circuit, delay trigger circuit and warning indicating circuit, the output terminal of described comparator circuit connects the input end of delay trigger circuit, and the output terminal of described delay trigger circuit connects the input end of warning indicating circuit.
Further, described comparator circuit comprises first resistance, second resistance, the 3rd resistance, first switch, second switch and impedance comparer; Described first resistance, one end connects first switch, the other end connects second switch, the other end of first switch connects the electrode input end of second resistance and impedance comparer respectively, the other end of second switch connects the negative input of the 3rd resistance and impedance comparer respectively, one termination power VCC of the other end of second resistance and impedance comparer, the other end of the 3rd resistance and impedance comparer and an end ground connection.
Further, described delay trigger circuit comprises the 4th resistance, time-delay trigger and electric capacity, one end of the 4th resistance, time-delay trigger and electric capacity is connected the output terminal of comparator circuit respectively, the other end ground connection of electric capacity, the other end of the 4th resistance and time-delay trigger all is connected to the input end of warning indicating circuit.
Further, described warning indicating circuit comprises triode, the 5th resistance and warning indicating device, the base stage of described triode connects the output terminal of delay trigger circuit, the collection earth polar connects the warning indicating device, the other end ground connection of warning indicating device, emitter connects the 5th resistance, another termination power of the 5th resistance VCC.
The beneficial effects of the utility model are:
The utility model can be widely used in the middle of the measurement of signals such as the temperature, humidity, gas concentration of industry spot, also can be applicable in the middle of the measurement of bio signal such as body temperature, electrocardio, brain electricity, myoelectricity of medical electronics industry.In the signal measurement process, can in time detect the state of signal measurement and nonserviceable and make prompting.The utility model can improve the validity of input, reduces because the various risks that the input failure brings, have simple in structure, cost is low, be easy to realize, stability is strong, various undesired signals is had the advantage of good inhibition effect.
Other advantages of the present utility model, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being conspicuous to those skilled in the art, perhaps can from practice of the present utility model, obtain instruction to investigating hereinafter.Target of the present utility model and other advantages can realize and obtain by specifically noted structure in following instructions or the accompanying drawing.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described:
As shown in Figure 1, the utility model comprises comparator circuit 1, delay trigger circuit 2 and warning indicating circuit 3, and the output terminal of comparator circuit 1 connects the input end of delay trigger circuit 2, and the output terminal of delay trigger circuit 2 connects the input end of warning indicating circuit 3.Whether impedance comparer 9 is used for the detecting sensor circuit and well is connected with post processing circuitry; The detection triggers that comes off 11 is used for detecting whether the signal that impedance comparer 9 sends here is undesired signal, if the detection triggers 11 that comes off detects the signal state that comes off, drives warning indicating circuit 3, can carry out sound or light and report to the police;
Comparator circuit 1 comprises first resistance 4, second resistance 7, the 3rd resistance 8, first switch 5, second switch 6 and impedance comparer 9; First resistance, 4 one ends connect first switch 5, the other end connects second switch 6, the other end of first switch 5 connects the electrode input end of second resistance 7 and impedance comparer 9 respectively, the other end of second switch 6 connects the negative input of the 3rd resistance 8 and impedance comparer 9 respectively, one termination power VCC of the other end of second resistance 7 and impedance comparer 9, the other end of the 3rd resistance 8 and impedance comparer 9 and an end ground connection, the output terminal of impedance comparer connects delay trigger circuit.
The voltage Vi at first resistance 4 and first resistance, 4 two ends represents the output impedance and the signal output voltage of various signal transducers, second resistance 7 and the 3rd resistance 8 are respectively the pull-up resistor and the pull down resistor of signal input part, require the resistance of second resistance 7, the 3rd resistance 8 to be far longer than first resistance 4.G is the gain (G〉1) of impedance comparer 9 signals, and Vcc is the working power of impedance comparer 9.When signal transducer is connected with impedance comparer 9, G * Vi＜Vcc, impedance comparer 9 is input as low level; When signal transducer and 9 disconnections of impedance comparer, two input ends of impedance comparer 9 are respectively Vcc and 0, G * Vcc〉Vcc, impedance comparer 9 is output as high level.
When impedance comparer 9 was output as stable high level, time-delay trigger 11 was output as stable high level signal; When impedance comparer 9 was output as low level or unsettled high level and corresponds to undesired signal, time-delay trigger 11 was output as low level signal.
When time-delay trigger 11 is output as when high, drive 14 conductings of PNP triode, warning indicating device 15 is activated, and the cue sensor connects and disconnects, and input is invalid; When time-delay trigger 11 is output as when low, drive PNP triode 14 and end, warning indicating device 15 is not worked, and promptly signal transducer connects well, and input is effective.
Explanation is at last, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, other modifications that those of ordinary skills make the technical solution of the utility model or be equal to replacement, only otherwise break away from the spirit and scope of technical solutions of the utility model, all should be encompassed in the middle of the claim scope of the present utility model.
Claims (4)
1. the signal input detection alarm device that comes off, it is characterized in that: comprise comparator circuit (1), delay trigger circuit (2) and warning indicating circuit (3), the output terminal of described comparator circuit (1) connects the input end of delay trigger circuit (2), and the output terminal of described delay trigger circuit (2) connects the input end of warning indicating circuit (3).
2. the signal according to claim 1 input detection alarm device that comes off, it is characterized in that: described comparator circuit (1) comprises first resistance (4), second resistance (7), the 3rd resistance (8), first switch (5), second switch (6) and impedance comparer (9); Described first resistance (4) one ends connect first switch (5), the other end connects second switch (6), the other end of first switch (5) connects the electrode input end of second resistance (7) and impedance comparer (9) respectively, the other end of second switch (6) connects the negative input of the 3rd resistance (8) and impedance comparer (9) respectively, one termination power VCC of the other end of second resistance (7) and impedance comparer (9), the other end of the 3rd resistance (8) and impedance comparer (9) and an end ground connection.
3. the signal according to claim 2 input detection alarm device that comes off, it is characterized in that: described delay trigger circuit (2) comprises the 4th resistance (10), time-delay trigger (11) and electric capacity (12), the 4th resistance (10), time-delay trigger (11) and an end of electric capacity (12) are connected the output terminal of comparator circuit (1) respectively, the other end ground connection of electric capacity (12), the other end of the 4th resistance (10) and time-delay trigger (11) all is connected to the input end of warning indicating circuit (3).
4. the signal according to claim 3 input detection alarm device that comes off, it is characterized in that: described warning indicating circuit (3) comprises triode (14), the 5th resistance (13) and warning indicating device (15), the base stage of described triode (14) connects the output terminal of delay trigger circuit (2), the collection earth polar connects warning indicating device (15), the other end ground connection of warning indicating device (15), emitter connects the 5th resistance (13), another termination power of the 5th resistance (13) VCC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020688694 CN201917632U (en) | 2010-12-30 | 2010-12-30 | Signal input dropout detection alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020688694 CN201917632U (en) | 2010-12-30 | 2010-12-30 | Signal input dropout detection alarm device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201917632U true CN201917632U (en) | 2011-08-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020688694 Expired - Lifetime CN201917632U (en) | 2010-12-30 | 2010-12-30 | Signal input dropout detection alarm device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201917632U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169153A (en) * | 2010-12-30 | 2011-08-31 | 河南华南医电科技有限公司 | Signal input fall-off detection and alarm device |
-
2010
- 2010-12-30 CN CN 201020688694 patent/CN201917632U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169153A (en) * | 2010-12-30 | 2011-08-31 | 河南华南医电科技有限公司 | Signal input fall-off detection and alarm device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110803 |
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| CX01 | Expiry of patent term |