CN207007980U - A kind of AC dump detects circuit - Google Patents
A kind of AC dump detects circuit Download PDFInfo
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- CN207007980U CN207007980U CN201720989863.5U CN201720989863U CN207007980U CN 207007980 U CN207007980 U CN 207007980U CN 201720989863 U CN201720989863 U CN 201720989863U CN 207007980 U CN207007980 U CN 207007980U
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Abstract
The utility model provides a kind of AC dump detection circuit, including AC input, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, electric capacity C1, exchange optocoupler U1, PNP triode Q1 and NPN triode Q2；Exchange optocoupler is used; and simple power resistor is protected to exchange optocoupler; when alternating current has electricity and normal work; detection signal exports high level, conversely, detection signal exports low level; the technical program is few using device; cost is cheap, and sensitivity is very high, can be applied in the system of complexity.
Description
Technical field
It the utility model is related to electronic communication technology field, more particularly to a kind of AC dump detection circuit.
Background technology
The power-off of quick detection AC power is required in some industrial equipments, then quickly makes corresponding action, therefore just
A kind of fast and reliable detection circuit of AC dump is needed accordingly.
Current AC dump detection circuit either be delayed too big or too complicated, or does not meet safety and requires.Such as
The power failure detection circuit of Patent No. 201120389487.9, circuit is more complicated, and PVCC any change can all cause a lot
The change of device, physical circuit are as described below：
As shown in figure 1, including two-phase AC signal input, diode D38, diode D17, optocoupler, electric capacity C20, electricity
Hinder R17, resistance R51, resistance R40, resistance R57, resistance R2, resistance R90, resistance R65, resistance R85, voltage stabilizing triode U6, steady
Diode ZD4 and triode Q8 is pressed, when AC signal input AC dump, not on-state, U6 1 pin is presented in OT12 immediately
Voltage rises immediately, and 2 pin voltages will drag down, Q8 cut-offs, exports the detection signal of high level.
Utility model content
The purpose of this utility model is to be directed to above-mentioned the deficiencies in the prior art, there is provided a kind of AC dump detection electricity
Road, using less device, the circuit of change is suitable for, realizes the function of fast and reliable outage detection.
To achieve the above object, the utility model employs following technical scheme：
The utility model provides a kind of AC dump detection circuit, including AC input, resistance R1, resistance R2,
Resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, electric capacity C1, exchange optocoupler U1, PNP triode Q1 and NPN triode
Q2, resistance R6 and resistance R7 are connected on partial pressure in AC input, after resistance R5, resistance R4 and resistance R2 parallel connections with work electricity
Source VDD connects, and PNP triode Q1 base stage connects the colelctor electrode of exchange optocoupler U1 receiving terminals, and PNP triode Q1 emitter stage connects electricity
Hold C1, resistance R1, resistance R3 are in parallel with electric capacity C1, and NPN triode Q2 base stage is connected on resistance R1 and resistance R3 centre, NPN
Triode Q2 colelctor electrode connecting resistance R2.
Further, the colelctor electrode output outage detection signal of the NPN triode Q2.
Further, the electric capacity C1 is common 0,603 1.0 F capacitors of encapsulation.
Further, the R1 and R3 are common 0603 encapsulation 10K Ohmic resistances；The resistance R2 is common 0603 encapsulation
4.7K Ohmic resistance；The resistance R4 and R5 is common 0603 encapsulation 20K Ohmic resistances；The resistance R6 and R7 is common 2512
Encapsulate 47K Ohmic resistances.
The beneficial effects of the utility model are：Exchange optocoupler, and simple power resistor has been used to enter exchange optocoupler
Row protection, when alternating current has electricity and normal work, detection signal output high level, conversely, detection signal exports low level, this
Technical scheme is few using device, and cost is cheap, and sensitivity is very high, can be applied in the system of complexity.
When working power changes, it is only necessary to change resistance R3 resistance can, and the technical scheme applies two
Individual triode combinational circuit, solve the problems, such as that alternating current zero passage voltage temporarily drops.
Brief description of the drawings
Fig. 1 is the AC power failure quick detection circuit structural representation of prior art；
Fig. 2 detects electrical block diagram for a kind of AC dump of the present utility model.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with the accompanying drawings and implement
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining this
Utility model, it is not used to limit the utility model.
Referring to Fig. 2, a kind of AC dump detection circuit, including AC input, resistance R1, resistance R2, resistance R3,
Resistance R4, resistance R5, resistance R6, resistance R7, electric capacity C1, exchange optocoupler U1, PNP triode Q1 and NPN triode Q2, resistance R6
Partial pressure in AC input is connected on resistance R7, so as to be protected to exchange optocoupler U1.Resistance R5, resistance R4 and resistance
Connected after R2 parallel connections with working power VDD, PNP triode Q1 base stage connects the colelctor electrode of exchange optocoupler U1 receiving terminals, the poles of PNP tri-
Pipe Q1 emitter stage meets electric capacity C1, and resistance R1, resistance R3 are in parallel with electric capacity C1, NPN triode Q2 base stage be connected on resistance R1 and
Resistance R3 centre, NPN triode Q2 colelctor electrode connecting resistance R2.
The colelctor electrode output outage detection signal of the NPN triode Q2.
The electric capacity C1 is common 0,603 1.0 F capacitors of encapsulation.
The R1 and R3 are common 0603 encapsulation 10K Ohmic resistances；The resistance R2 is common 0603 encapsulation 4.7K ohms
Resistance；The resistance R4 and R5 is common 0603 encapsulation 20K Ohmic resistances；The resistance R6 and R7 is common 2512 encapsulation 47K
Ohmic resistance.
Wherein, it is TCMT1600 to exchange optocoupler U1；PNP triode Q1 is MMBT4403LT1；NPN triode Q2 is
MMBT4401LT1。
The AC dump detects circuit, and using the isolation and switching characteristic for exchanging optocoupler, the absolute height of alternating current is passed
Lead above transistor below, then utilize transistor switch condition and the charge-discharge characteristic of RC circuits so that output inspection
The change of exchange electric switch can be followed by surveying signal.
When alternating current has electricity, and during normal work, when voltage is higher than threshold value, exchange optocoupler U1 inputs are luminous cause it is defeated
Go out to hold PNP triode Q1 to turn on, PNP triode Q1 base voltage becomes 0.4V, and now PNP triode Q1 is turned on, the poles of PNP tri-
Pipe Q1 emitter voltage becomes 1.0V or so, and then this 1.0V obtains 0.5V by resistance R1 and resistance R3 partial pressure, because
This PNP triode Q2 ends, detection signal output high level.
When alternating current has electricity, and during normal work, when voltage is less than threshold value, exchange optocoupler U1 inputs are not luminous to be caused
Output end PNP triode Q1 ends, and PNP triode Q1 base voltage becomes 5.0V, then electric capacity C1 is slowly charged, filling
NPN triode Q2 base voltage is very low in the process of electricity, NPN triode Q2 cut-offs, detection signal output high level, works as electric capacity
After C1 charging completes, alternating current operating voltage is higher than threshold value again, and PNP triode Q1 is turned on again, electric capacity C1 again quickly through
PNP triode Q1 discharges, and NPN triode Q2 base voltage is still very low, and NPN triode Q2 continues to end, and detection signal is defeated
Go out high level.
When alternating current powers off, exchange optocoupler U1 inputs are not luminous to cause the cut-off of output end triode, PNP triode Q1
Base voltage becomes 5.0V, and then this electric capacity C1 is slowly charged, the NPN triode Q2 base voltage during charging
Very low, NPN triode Q2 cut-off detection signal output high level, after electric capacity C1 charging completes, 5.0V is by resistance R4, resistance
R1 and resistance R3 partial pressure obtain 1.25V, and now NPN triode Q2 is turned on, detection signal output low level.
In summary, NPN triode Q2 can follow alternating current to have electricity and the change without electricity, NPN tri- when alternating current has electricity
Pole pipe Q2 ends immediately, and detection signal output high level, NPN triode Q2 is turned on quickly when alternating current is without electricity, and detection signal is defeated
Go out low level.
Embodiment described above only expresses embodiment of the present utility model, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the utility model patent scope can not be interpreted as.It should be pointed out that the ordinary skill for this area
For personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these belong to this
The protection domain of utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (4)
1. a kind of AC dump detects circuit, it is characterised in that：Including AC input, resistance R1, resistance R2, resistance R3,
Resistance R4, resistance R5, resistance R6, resistance R7, electric capacity C1, exchange optocoupler U1, PNP triode Q1 and NPN triode Q2, resistance R6
Partial pressure in AC input is connected on resistance R7, is gone here and there after resistance R5, resistance R4 and resistance R2 parallel connections with working power VDD
Connection, PNP triode Q1 base stage connect the colelctor electrode of exchange optocoupler U1 receiving terminals, and PNP triode Q1 emitter stage meets electric capacity C1, electricity
Resistance R1, resistance R3 are in parallel with electric capacity C1, and NPN triode Q2 base stage is connected on resistance R1 and resistance R3 centre, NPN triode Q2
Colelctor electrode connecting resistance R2.
A kind of 2. AC dump detection circuit according to claim 1, it is characterised in that：The collection of the NPN triode Q2
Electrode exports outage detection signal.
A kind of 3. AC dump detection circuit according to claim 1, it is characterised in that：The electric capacity C1 is common 0603
Encapsulate 1.0 F capacitors.
A kind of 4. AC dump detection circuit according to claim 1, it is characterised in that：The R1 and R3 are common 0603
Encapsulate 10K Ohmic resistances；The resistance R2 is common 0603 encapsulation 4.7K Ohmic resistances；The resistance R4 and R5 is common 0603
Encapsulate 20K Ohmic resistances；The resistance R6 and R7 is common 2512 encapsulation 47K Ohmic resistances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720989863.5U CN207007980U (en) | 2017-08-09 | 2017-08-09 | A kind of AC dump detects circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720989863.5U CN207007980U (en) | 2017-08-09 | 2017-08-09 | A kind of AC dump detects circuit |
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| Publication Number | Publication Date |
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| CN207007980U true CN207007980U (en) | 2018-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720989863.5U Active CN207007980U (en) | 2017-08-09 | 2017-08-09 | A kind of AC dump detects circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794339A (en) * | 2019-10-09 | 2020-02-14 | 国网山东省电力公司东平县供电公司 | Centralized acousto-optic alarm power-off indicator, mechanism and method |
-
2017
- 2017-08-09 CN CN201720989863.5U patent/CN207007980U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794339A (en) * | 2019-10-09 | 2020-02-14 | 国网山东省电力公司东平县供电公司 | Centralized acousto-optic alarm power-off indicator, mechanism and method |
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