CN208351325U - A kind of power-fail detection circuit applied to Environment Monitoring Unit - Google Patents
A kind of power-fail detection circuit applied to Environment Monitoring Unit Download PDFInfo
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- CN208351325U CN208351325U CN201821064963.8U CN201821064963U CN208351325U CN 208351325 U CN208351325 U CN 208351325U CN 201821064963 U CN201821064963 U CN 201821064963U CN 208351325 U CN208351325 U CN 208351325U
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Abstract
The utility model relates to a kind of power-fail detection circuit applied to Environment Monitoring Unit, solution be Environment Monitoring Unit detection of power loss inaccuracy technical problem, by using include the first bleeder circuit, the second bleeder circuit；First bleeder circuit is connected with the 1st foot of the one end overvoltage protection diode D1, zener diode D2 cathode and photo-coupler；Second bleeder circuit connects the overvoltage protection diode D1 other end, zener diode D2 anode and the 2nd foot of photo-coupler；The 4th foot of photo-coupler connects 3.3V voltage end after connecting pull-up resistor R5, and the 3rd foot connects the base stage of driving switch triode Q1；Driving switch triode Q1 base stage and emitter are connected with pull down resistor R1O, and collector connects 3.3V voltage end after being connected with pull-up resistor R6；The intersection point of pull-up resistor R6 and driving switch triode Q1 collector is the technical solution of detection output, preferably resolves the problem, can be used in Environment Monitoring Unit.
Description
Technical field
The utility model relates to detection of power loss fields, and in particular to a kind of detection of power loss electricity applied to Environment Monitoring Unit
Road.
Background technique
Environment supervision instrument (digital thermometer) is total for monitoring the instrument of indoor and outdoor surroundings parameters
Claim, by the measurement to the typical value for influencing environmental quality factor, determines environmental quality (or pollution level) and its variation tendency.
It is unstable to frequently encounter power supply in actual application, power momentary interruption the case where.There is no to electricity for equipment
The flash in source does design protection, and this problem is likely to result in the unexpected shutdown of equipment.The utility model provided one kind and was used for
The power-fail detection circuit of Environment Monitoring Unit can detecte the power supply flash more than 10ms, provide foundation for equipment fault monitoring.
Utility model content
Technical problem to be solved in the utility model is that the technology of detection of power loss inaccuracy existing in the prior art is asked
Topic.A kind of new power-fail detection circuit applied to Environment Monitoring Unit is provided, it should be applied to the detection of power loss electricity of Environment Monitoring Unit
Road has the characteristics that can detecte the power supply flash more than 10ms.
In order to solve the above technical problems, the technical solution adopted is as follows:
A kind of power-fail detection circuit applied to Environment Monitoring Unit, the power-fail detection circuit include and slowdown monitoring circuit electricity to be checked
First bleeder circuit of press bond, the second bleeder circuit of ground terminal connection；First bleeder circuit is connected with overvoltage protection two
The 1st foot of the one end pole pipe D1, zener diode D2 cathode and photo-coupler；It is another that second bleeder circuit connects overvoltage protection diode D1
One end, zener diode D2 anode and the 2nd foot of photo-coupler；The 4th foot of photo-coupler connects connection 3.3V electricity after pull-up resistor R5
Pressure side, the 3rd foot connect the base stage of driving switch triode Q1；Driving switch triode Q1 base stage and emitter are connected with drop-down electricity
R1O is hindered, collector connects 3.3V voltage end after being connected with pull-up resistor R6；Pull-up resistor R6 and driving switch triode Q1 current collection
The intersection point of pole is detection output.
Working principle of the utility model is: converting low-voltage signal for the 220V of alternating current by electric resistance partial pressure.Pass through optocoupler
Isolation conversion, output the period be 50Hz square-wave signal.Ideally if detecting that high level signal is more than 10ms can
To be judged as power supply trouble, it is contemplated that the frequency fluctuation of alternating current can taking human as setting power down judge time interval.
In above scheme, for optimization, further, first bleeder circuit includes concatenated resistance R1, resistance R2, electricity
Hinder R3 and resistance R4.
Further, first bleeder circuit includes concatenated resistance R11, resistance 1R2, resistance R13 and resistance R14.
Further, the photo-coupler is TLP291.
The utility model has the beneficial effects that
In the utility model, L and N are AC power source Input Monitor Connector point, and resistance R1-R4, R11-/R14 constitute divider resistance
Network drives optocoupler after partial pressure, so that optocoupler is exported a square-wave signal, to control the on-off of triode Q1.SENSOR termination
By the monitoring of processor, in the case of normal use, the end SENSOR is a 50Hz square-wave signal, after input terminal power supply power-fail,
The end SENSOR is then kept the high level of long period.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is used for the power-fail detection circuit schematic diagram of Environment Monitoring Unit in embodiment 1.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, with reference to embodiments, to this
Utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to explain that this is practical new
Type is not used to limit the utility model.
Embodiment 1
The present embodiment provides a kind of power-fail detection circuit applied to Environment Monitoring Unit, such as Fig. 1, the power-fail detection circuits
Including the first bleeder circuit being connect with circuit voltage end to be detected, the second bleeder circuit of ground terminal connection；First partial pressure electricity
Road is connected with the 1st foot of the one end overvoltage protection diode D1, zener diode D2 cathode and photo-coupler；The connection of second bleeder circuit
The overvoltage protection diode D1 other end, zener diode D2 anode and the 2nd foot of photo-coupler；The 4th foot of photo-coupler connection pull-up
3.3V voltage end is connected after resistance R5, the 3rd foot connects the base stage of driving switch triode Q1；Driving switch triode Q1 base stage with
Emitter is connected with pull down resistor R1O, and collector connects 3.3V voltage end after being connected with pull-up resistor R6；Pull-up resistor R6 and drive
The intersection point of dynamic switching transistor Q1 collector is detection output.
Low-voltage signal is converted by the 220V of alternating current by electric resistance partial pressure.By the isolation conversion of optocoupler, the output period is
The square-wave signal of 50Hz.Ideally if detecting that high level signal is more than that 10ms may determine that as power supply trouble, consideration
To alternating current frequency fluctuation can taking human as setting power down judge time interval.
Specifically, first bleeder circuit includes concatenated resistance R1, resistance R2, resistance R3 and resistance R4.Described
Two bleeder circuits include concatenated resistance R11, resistance 1R2, resistance R13 and resistance R14.Wherein, photo-coupler TLP291.
Component value, model and the effect such as table 1 of this implementation.
Table 1
L and N is AC power source Input Monitor Connector point in the present embodiment, and R1/R2/R3/R4/R11/R12/R13/R14, which is constituted, to be divided
Piezoresistance network drives optocoupler after partial pressure, so that optocoupler is exported a square-wave signal, to control the on-off of triode Q1.
SENSOR terminates the monitoring by processor, and in the case of normal use, the end SENSOR is a 50Hz square-wave signal, when input terminal electricity
After the power down of source, the end SENSOR is then kept the high level of long period.
Although the illustrative specific embodiment of the utility model is described above, in order to the art
Technical staff is it will be appreciated that the utility model, but the utility model is not limited only to the range of specific embodiment, to this technology
For the those of ordinary skill in field, as long as long as the utility model that various change is limited and determined in the attached claims
In spirit and scope, all are created using the utility model of the utility model design in the column of protection.
Claims (4)
1. a kind of power-fail detection circuit applied to Environment Monitoring Unit, it is characterised in that: the power-fail detection circuit include with to
First bleeder circuit of detection circuit voltage end connection, the second bleeder circuit of ground terminal connection；First bleeder circuit is connected with
The 1st foot of the one end overvoltage protection diode D1, zener diode D2 cathode and photo-coupler；Second bleeder circuit connects overvoltage protection
The diode D1 other end, zener diode D2 anode and the 2nd foot of photo-coupler；
The 4th foot of photo-coupler connects 3.3V voltage end after connecting pull-up resistor R5, and the 3rd foot connects the base of driving switch triode Q1
Pole；
Driving switch triode Q1 base stage and emitter are connected with pull down resistor R1O, and collector connects after being connected with pull-up resistor R6
Connect 3.3V voltage end；
The intersection point of pull-up resistor R6 and driving switch triode Q1 collector is detection output.
2. the power-fail detection circuit according to claim 1 applied to Environment Monitoring Unit, it is characterised in that: described first point
Volt circuit includes concatenated resistance R1, resistance R2, resistance R3 and resistance R4.
3. the power-fail detection circuit according to claim 1 applied to Environment Monitoring Unit, it is characterised in that: described first point
Volt circuit includes concatenated resistance R11, resistance 1R2, resistance R13 and resistance R14.
4. the power-fail detection circuit according to claim 1 to 3 applied to Environment Monitoring Unit, it is characterised in that: described
Photo-coupler is TLP291.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821064963.8U CN208351325U (en) | 2018-07-05 | 2018-07-05 | A kind of power-fail detection circuit applied to Environment Monitoring Unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821064963.8U CN208351325U (en) | 2018-07-05 | 2018-07-05 | A kind of power-fail detection circuit applied to Environment Monitoring Unit |
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| Publication Number | Publication Date |
|---|---|
| CN208351325U true CN208351325U (en) | 2019-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821064963.8U Active CN208351325U (en) | 2018-07-05 | 2018-07-05 | A kind of power-fail detection circuit applied to Environment Monitoring Unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109884374A (en) * | 2019-01-30 | 2019-06-14 | 成都图灵创想科技有限责任公司 | A kind of straight-bar machines voltage detecting circuit |
-
2018
- 2018-07-05 CN CN201821064963.8U patent/CN208351325U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109884374A (en) * | 2019-01-30 | 2019-06-14 | 成都图灵创想科技有限责任公司 | A kind of straight-bar machines voltage detecting circuit |
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