CN104360229B - One kind length treats that type is opposed electricity-stealing checking instrument - Google Patents
One kind length treats that type is opposed electricity-stealing checking instrument Download PDFInfo
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- CN104360229B CN104360229B CN201410638762.4A CN201410638762A CN104360229B CN 104360229 B CN104360229 B CN 104360229B CN 201410638762 A CN201410638762 A CN 201410638762A CN 104360229 B CN104360229 B CN 104360229B
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Abstract
Treat that type is opposed electricity-stealing checking instrument the invention discloses one kind length, including power circuit, sample circuit, comparison circuit and warning circuit, power circuit provides voltage analog signal for circuit, sample circuit is input to comparison circuit and is compared by the DC voltage that is gathered from power circuit after resistance R1 and potentiometer RP1 partial pressures, comparison circuit by sampling circuit samples to voltage and upper and lower limit reference voltage be compared respectively to judge line voltage abnormal conditions, warning circuit distinguishes various electric voltage exception situations by sending different alarm sounds.By the present invention in that being core, cheap electronic component to the timer of three terminal regulator 7812 and 555, circuit cost is set to be effectively controlled, and it is less using resistive element, power consumption is low, in Guangdong power system, buzzer B1 and buzzer B2 can send the different sounds to remind fault type.
Description
Technical field
The present invention relates to a kind of warning circuit, specifically a kind of length treats that type is opposed electricity-stealing checking instrument.
Background technology
Power system need personnel power transformation station equipment is carried out walkaround inspection, operation operation, repair and maintenance, high pressure examination
Test, protective calibration and metering debugging etc. work.Making an inspection tour, maintenance, safeguard and process of the test in, operating electrical equipment can be because
It is a variety of causes, such as：It is subjected to the generation of the significant troubles such as overvoltage impact, system short-circuit, equipment explosion and busbar grounding, after failure
Transformer station's internal fault point peripherally current potential rising, the step voltage allowed more than safety standard and contact voltage, if personnel miss
Enter above-mentioned zone can to damaging, the even serious consequence such as death, so a kind of length of design treats type checking instrument of opposing electricity-stealing being
It is highly desirable to, can avoids often changing the worry of battery, prior art general circuit structure is more complicated and uses electronics
Element is expensive, the present invention is intended to provide a kind of simple structure, consumption electric energy are few and standby using the cheap length of electronic component
Type is opposed electricity-stealing checking instrument.
The content of the invention
It is an object of the invention to provide a kind of simple structure, consumption electric energy is few and uses the cheap length of electronic component
Treat that type is opposed electricity-stealing checking instrument, to solve the problems, such as to be proposed in above-mentioned background technology.
To achieve the above object, the present invention provides following technical scheme：
One kind length treats that type is opposed electricity-stealing checking instrument, including power circuit, sample circuit, comparison circuit and warning circuit, institute
Power circuit is stated including reduction voltage circuit, rectification circuit, filter circuit and mu balanced circuit for circuit provides voltage analog signal, power supply
Circuit includes inductance L, rectifier bridge Q and three terminal regulator U1；The sample circuit is by the DC voltage that is gathered from power circuit
Comparison circuit is input to after resistance R1 and potentiometer RP1 partial pressures to be compared, sample circuit includes resistance R1, resistance R2 and electricity
Position device RP1；The comparison circuit by sampling circuit samples to voltage and upper and lower limit reference voltage be compared to judge respectively
Line voltage abnormal conditions, comparison circuit includes four-operational amplifier U4 and resistance R9；The warning circuit is by sending difference
Alarm sound to distinguish various electric voltage exception situations, warning circuit includes buzzer B1, buzzer B2 and timer U7；
The inductance L two ends are connected respectively to rectifier bridge Q ports 1 and rectifier bridge Q ports 3, and rectification bridge port 4 is connected respectively
Electric capacity C1, electric capacity C3 and three terminal regulator U1 ports 1, rectification bridge port 2 connect electric capacity C2, electric capacity C4 and three terminal regulator respectively
U3 ports 2, three terminal regulator U3 ports 1 connect respectively three terminal regulator U1 ports 2, the electric capacity C1 other ends, the electric capacity C3 other ends,
The electric capacity C2 other ends, the electric capacity C4 other ends and three terminal regulator U2 ports 2 are simultaneously grounded, and the three terminal regulator U1 ports 3 are distinguished
Connection three terminal regulator U2 ports 1, four-operational amplifier U4 ports 4, four-operational amplifier U4 ports 9 and resistance R1, resistance R1
The other end is sequentially connected potentiometer RP1 and earth resistance R2, and the three terminal regulator U3 ports 3 connect four-operational amplifier respectively
U4 ports 5 and four-operational amplifier U4 ports 11, the connection of four-operational amplifier U4 ports 1 resistance R9, four-operational amplifier U4 ends
Mouth 2 connects three terminal regulator U2 ports 3, resistance R3, resistance R5, timer U5 ports 1, resistance R7, timer U6 ports 1 respectively
With timer U6 ports 4, four-operational amplifier U4 ports 3 connect potentiometer RP1 slide plates and four-operational amplifier U4 ports respectively
6, four-operational amplifier U4 port 7 connects resistance R10, the connection of four-operational amplifier U4 ports 8 potentiometer RP2 slide plates, the electricity
The resistance R9 other ends connect ground capacity C8 positive poles and timer U7 ports 4 respectively, and the resistance R3 other ends are sequentially connected current potential
Device RP2 and earth resistance R4, the timer U5 ports 2 connect electric capacity C5, and the electric capacity C5 other ends connect timer U5 ends respectively
Mouthfuls 8, timer U5 ports 6, resistance R6 and buzzer B1 and it is grounded, the connection of the timer U5 ports 3 buzzer B1 other ends, timing
Device U5 ports 4 connect the resistance R10 other ends and ground capacity C9 respectively, and timer U5 ports 7 connect the resistance R5 other ends respectively
With the resistance R6 other ends, the timer U6 ports 2 connect ground capacity C6, timer U6 ports 6 and resistance R8, electric capacity respectively
The C6 other ends are grounded, the connection timer U7 ports of timer U6 ports 35, and timer U6 ports 8 connect electric capacity C7, timing respectively
Device U7 ports 8 and buzzer B2 are simultaneously grounded, and the electric capacity C7 other ends connect timer U7 ports 2 and timer U7 ports 6, institute respectively
The connection of timer U7 ports 1 resistance R11 is stated, timer U7 ports 2 connect timer U7 ports 6 and resistance R12, timer respectively
U7 ports 3 connect the buzzer B2 other ends, and timer U7 ports 7 connect the resistance R11 other ends and the resistance R12 other ends respectively.
As further scheme of the invention：The three terminal regulator U1 and three terminal regulator U3 models 7812, it is described
Three terminal regulator U2 models 7805, the four-operational amplifier U4 models LM324, the timer U5, timer U6 and
Timer U7 is 555 timers.
As further scheme of the invention：The timer U6 is connected into LF multivibrator, the timer U7
Audio frequency oscillator is connected into, the control level terminal of the output signal control timer U7 of timer U6 makes timer U7 replace real estate
Raw two kinds of signal outputs of different frequency, can promote buzzer B2 that " drop --- beep " sound occurs.
Compared with prior art, the beneficial effects of the invention are as follows：By the present invention in that being used to three terminal regulator 7812 and 555
Timer is core, cheap electronic component, circuit cost is effectively controlled, and less using resistive element,
Power consumption is low, and when power network line breaks down, buzzer B1 and buzzer B2 can send the different sounds to remind fault type.
Brief description of the drawings
Fig. 1 is that length treats that type is opposed electricity-stealing the circuit diagram of checking instrument.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1 is referred to, in the embodiment of the present invention, one kind length treats that type is opposed electricity-stealing checking instrument, including power circuit, sampling electricity
Road, comparison circuit and warning circuit, the power circuit is including reduction voltage circuit, rectification circuit, filter circuit and mu balanced circuit
Circuit provides voltage analog signal, and power circuit includes inductance L, rectifier bridge Q and three terminal regulator U1；The sample circuit passes through
Comparison circuit is input to after resistance R1 and potentiometer RP1 partial pressures to be compared, sample from the DC voltage of power circuit collection
Circuit includes resistance R1, resistance R2 and potentiometer RP1；Voltage and upper and lower limit that the comparison circuit arrives sampling circuit samples
Reference voltage is compared to judge line voltage abnormal conditions respectively, and comparison circuit includes four-operational amplifier U4 and resistance
R9；The warning circuit distinguishes various electric voltage exception situations by sending different alarm sounds, and warning circuit includes buzzer
B1, buzzer B2 and timer U7；
The inductance L two ends are connected respectively to rectifier bridge Q ports 1 and rectifier bridge Q ports 3, and rectification bridge port 4 is connected respectively
Electric capacity C1, electric capacity C3 and three terminal regulator U1 ports 1, rectification bridge port 2 connect electric capacity C2, electric capacity C4 and three terminal regulator respectively
U3 ports 2, three terminal regulator U3 ports 1 connect respectively three terminal regulator U1 ports 2, the electric capacity C1 other ends, the electric capacity C3 other ends,
The electric capacity C2 other ends, the electric capacity C4 other ends and three terminal regulator U2 ports 2 are simultaneously grounded, and the three terminal regulator U1 ports 3 are distinguished
Connection three terminal regulator U2 ports 1, four-operational amplifier U4 ports 4, four-operational amplifier U4 ports 9 and resistance R1, resistance R1
The other end is sequentially connected potentiometer RP1 and earth resistance R2, and the three terminal regulator U3 ports 3 connect four-operational amplifier respectively
U4 ports 5 and four-operational amplifier U4 ports 11, the connection of four-operational amplifier U4 ports 1 resistance R9, four-operational amplifier U4 ends
Mouth 2 connects three terminal regulator U2 ports 3, resistance R3, resistance R5, timer U5 ports 1, resistance R7, timer U6 ports 1 respectively
With timer U6 ports 4, four-operational amplifier U4 ports 3 connect potentiometer RP1 slide plates and four-operational amplifier U4 ports respectively
6, four-operational amplifier U4 port 7 connects resistance R10, the connection of four-operational amplifier U4 ports 8 potentiometer RP2 slide plates, the electricity
The resistance R9 other ends connect ground capacity C8 positive poles and timer U7 ports 4 respectively, and the resistance R3 other ends are sequentially connected current potential
Device RP2 and earth resistance R4, the timer U5 ports 2 connect electric capacity C5, and the electric capacity C5 other ends connect timer U5 ends respectively
Mouthfuls 8, timer U5 ports 6, resistance R6 and buzzer B1 and it is grounded, the connection of the timer U5 ports 3 buzzer B1 other ends, timing
Device U5 ports 4 connect the resistance R10 other ends and ground capacity C9 respectively, and timer U5 ports 7 connect the resistance R5 other ends respectively
With the resistance R6 other ends, the timer U6 ports 2 connect ground capacity C6, timer U6 ports 6 and resistance R8, electric capacity respectively
The C6 other ends are grounded, the connection timer U7 ports of timer U6 ports 35, and timer U6 ports 8 connect electric capacity C7, timing respectively
Device U7 ports 8 and buzzer B2 are simultaneously grounded, and the electric capacity C7 other ends connect timer U7 ports 2 and timer U7 ports 6, institute respectively
The connection of timer U7 ports 1 resistance R11 is stated, timer U7 ports 2 connect timer U7 ports 6 and resistance R12, timer respectively
U7 ports 3 connect the buzzer B2 other ends, and timer U7 ports 7 connect the resistance R11 other ends and the resistance R12 other ends respectively.
The three terminal regulator U1 and three terminal regulator U3 models 7812, the three terminal regulator U2 models 7805, four fortune
Calculate amplifier U4 models LM324, the timer U5, timer U6 and timer U7 and be 555 timers.The timer
U6 is connected into LF multivibrator, and the timer U7 is connected into audio frequency oscillator, the output signal control timer of timer U6
The control level terminal of U7, makes timer U7 alternately produce two kinds of signal outputs of different frequency, and buzzer B2 can be promoted to occur
" drop --- beep " sound.
Operation principle of the invention is：Inductance L is signal couple input, and power circuit includes reduction voltage circuit, rectified current
Road, filter circuit and mu balanced circuit provide voltage analog signal for circuit, and sample circuit is by the direct current that is gathered from power circuit
Voltage is input to comparison circuit and is compared after resistance R1 and potentiometer RP1 partial pressures, and comparison circuit arrives sampling circuit samples
Voltage and upper and lower limit reference voltage be compared respectively to judge line voltage abnormal conditions, warning circuit is by sending not
With alarm sound distinguishing various abnormal conditions.
Timer U6 is connected into LF multivibrator, and timer U7 is connected into audio frequency oscillator, the output signal of timer U6
The control level terminal of control timer U7, makes timer U7 alternately produce two kinds of signal outputs of different frequency, can promote honeybee
There is " drop beep " sound in ring device B2, and the sound type that buzzer B1 sends is " drop --- drop ", two kinds of different sound types
Represent different fault types.
Claims (3)
1. a kind of length treats that type is opposed electricity-stealing checking instrument, including power circuit, sample circuit, comparison circuit and warning circuit, and it is special
Levy and be, the power circuit includes reduction voltage circuit, rectification circuit, filter circuit and mu balanced circuit for circuit provides voltage analog
Signal, power circuit includes inductance L, rectifier bridge Q and three terminal regulator U1；The sample circuit from power circuit by gathering
DC voltage is input to comparison circuit and is compared after resistance R1 and potentiometer RP1 partial pressures, and sample circuit includes resistance R1, electricity
Resistance R2 and potentiometer RP1；The comparison circuit by sampling circuit samples to voltage compared respectively with upper and lower limit reference voltage
Compared with to judge line voltage abnormal conditions, comparison circuit includes four-operational amplifier U4 and resistance R9；The warning circuit passes through
Different alarm sounds are sent to distinguish various electric voltage exception situations, warning circuit includes buzzer B1, buzzer B2 and timer
U7；
The inductance L two ends are connected respectively to rectifier bridge Q ports 1 and rectifier bridge Q ports 3, and rectification bridge port 4 connects electric capacity respectively
C1, electric capacity C3 and three terminal regulator U1 ports 1, rectification bridge port 2 connect electric capacity C2, electric capacity C4 and three terminal regulator U3 ends respectively
Mouth 2, three terminal regulator U3 ports 1 connect three terminal regulator U1 ports 2, the electric capacity C1 other ends, the electric capacity C3 other ends, electric capacity respectively
The C2 other ends, the electric capacity C4 other ends and three terminal regulator U2 ports 2 are simultaneously grounded, and the three terminal regulator U1 ports 3 connect respectively
Three terminal regulator U2 ports 1, four-operational amplifier U4 ports 4, four-operational amplifier U4 ports 9 and resistance R1, resistance R1 are another
End is sequentially connected potentiometer RP1 and earth resistance R2, and the three terminal regulator U3 ports 3 connect four-operational amplifier U4 ends respectively
5 and four-operational amplifier U4 of mouth ports 11, the connection of four-operational amplifier U4 ports 1 resistance R9,2 points of four-operational amplifier U4 ports
Lian Jie not three terminal regulator U2 ports 3, resistance R3, resistance R5, timer U5 ports 1, resistance R7, timer U6 ports 1 and fixed
When device U6 ports 4, four-operational amplifier U4 ports 3 connect potentiometer RP1 slide plates and four-operational amplifier U4 ports 6, four respectively
Operational amplifier U4 ports 7 connect resistance R10, the connection of four-operational amplifier U4 ports 8 potentiometer RP2 slide plates, the resistance R9
The other end connects ground capacity C8 positive poles and timer U7 ports 4 respectively, and the resistance R3 other ends are sequentially connected potentiometer RP2
With earth resistance R4, the timer U5 ports 2 connect electric capacity C5, and the electric capacity C5 other ends connect timer U5 ports 8, fixed respectively
When device U5 ports 6, resistance R6 and buzzer B1 and be grounded, the connection of the timer U5 ports 3 buzzer B1 other ends, timer U5 ends
Mouth 4 connects the resistance R10 other ends and ground capacity C9 respectively, and timer U5 ports 7 connect the resistance R5 other ends and resistance respectively
The R6 other ends, it is another that the timer U6 ports 2 connect ground capacity C6, timer U6 ports 6 and resistance R8, electric capacity C6 respectively
End ground connection, the connection timer U7 ports of timer U6 ports 35, timer U6 ports 8 connect electric capacity C7, timer U7 ends respectively
8 and buzzer B2 of mouth is simultaneously grounded, and the electric capacity C7 other ends connect timer U7 ports 2 and timer U7 ports 6, the timing respectively
Device U7 ports 1 connect resistance R11, and timer U7 ports 2 connect timer U7 ports 6 and resistance R12, timer U7 ports respectively
The 3 connection buzzer B2 other ends, timer U7 ports 7 connect the resistance R11 other ends and the resistance R12 other ends respectively.
2. length according to claim 1 treats that type is opposed electricity-stealing checking instrument, it is characterised in that the three terminal regulator U1 and three
Hold voltage-stablizer U3 models 7812, the three terminal regulator U2 models 7805, the four-operational amplifier U4 models
LM324, the timer U5, timer U6 and timer U7 are 555 timers.
3. length according to claim 1 treats that type is opposed electricity-stealing checking instrument, it is characterised in that the timer U6 is connected into low frequency
Multivibrator, the timer U7 is connected into audio frequency oscillator, the control electricity of the output signal control timer U7 of timer U6
Flush end, makes timer U7 alternately produce two kinds of signal outputs of different frequency, and buzzer B2 can be promoted to occur " drop --- beep "
The sound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410638762.4A CN104360229B (en) | 2014-11-13 | 2014-11-13 | One kind length treats that type is opposed electricity-stealing checking instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410638762.4A CN104360229B (en) | 2014-11-13 | 2014-11-13 | One kind length treats that type is opposed electricity-stealing checking instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104360229A CN104360229A (en) | 2015-02-18 |
| CN104360229B true CN104360229B (en) | 2017-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410638762.4A Active CN104360229B (en) | 2014-11-13 | 2014-11-13 | One kind length treats that type is opposed electricity-stealing checking instrument |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569560A (en) * | 2014-12-11 | 2015-04-29 | 国家电网公司 | Abnormal power grid voltage alarm system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87206211U (en) * | 1987-11-09 | 1988-08-03 | 高春辉 | Integrated warning unit of warner |
| CN101599208A (en) * | 2009-07-16 | 2009-12-09 | 北京联合大学 | Combustible gas leakage alarm |
| CN201464547U (en) * | 2009-05-26 | 2010-05-12 | 罗琳 | Voltage monitor |
| CN201946085U (en) * | 2010-12-17 | 2011-08-24 | 王群英 | Electrical fire monitoring transmission device |
| CN202512162U (en) * | 2012-02-13 | 2012-10-31 | 肖兰 | Carrier voltage monitoring alarm |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RO77370B1 (en) * | 1981-03-05 | 1984-04-30 | Centrul De Cercetare Stiintifica Si Inginerie Tehnologica Pentru Semiconductoare | Electronic tension regulator with fault signalling at motor vehicles and method for differential fault signalling |
| WO2012176248A1 (en) * | 2011-06-20 | 2012-12-27 | パナソニック株式会社 | Power supply voltage detection circuit |
| CN102684146A (en) * | 2012-04-07 | 2012-09-19 | 三科电器集团有限公司 | Zero-lacking alarm protective circuit of three-phase voltage stabilizer |
| CN202661574U (en) * | 2012-07-14 | 2013-01-09 | 崔光宏 | Power generation alarm controller of vase station machine room oil engine |
| CN203224333U (en) * | 2013-04-16 | 2013-10-02 | 成都世旗电子科技有限公司 | Overpressure alarm used for autoclave |
| CN203519175U (en) * | 2013-09-12 | 2014-04-02 | 天津市滨海新区塘沽于庄橡胶厂 | Temperature monitoring alarm device used for rubber injection machine |
| CN103471727A (en) * | 2013-09-16 | 2013-12-25 | 成都赛腾自动化工程有限公司 | Large-scale rotating machine bearing temperature alarming and monitoring device |
| CN203520596U (en) * | 2013-10-09 | 2014-04-02 | 天津燃洁斯工业设备有限公司 | Motor temperature monitoring alarm device for industrial automation equipment |
| CN204142830U (en) * | 2014-09-14 | 2015-02-04 | 国家电网公司 | A kind of line voltage abnormity alarm circuit |
-
2014
- 2014-11-13 CN CN201410638762.4A patent/CN104360229B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87206211U (en) * | 1987-11-09 | 1988-08-03 | 高春辉 | Integrated warning unit of warner |
| CN201464547U (en) * | 2009-05-26 | 2010-05-12 | 罗琳 | Voltage monitor |
| CN101599208A (en) * | 2009-07-16 | 2009-12-09 | 北京联合大学 | Combustible gas leakage alarm |
| CN201946085U (en) * | 2010-12-17 | 2011-08-24 | 王群英 | Electrical fire monitoring transmission device |
| CN202512162U (en) * | 2012-02-13 | 2012-10-31 | 肖兰 | Carrier voltage monitoring alarm |
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| CN104360229A (en) | 2015-02-18 |
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