CN203324363U - Power failure detection system - Google Patents
Power failure detection system Download PDFInfo
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- CN203324363U CN203324363U CN2013203479165U CN201320347916U CN203324363U CN 203324363 U CN203324363 U CN 203324363U CN 2013203479165 U CN2013203479165 U CN 2013203479165U CN 201320347916 U CN201320347916 U CN 201320347916U CN 203324363 U CN203324363 U CN 203324363U
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Abstract
The utility model belongs to the technical field of electric power equipment detection, and discloses a power failure detection system which comprises a voltage detection unit, a first comparator, a second comparator and a one-chip microcomputer. The input end of the voltage detection unit is connected with a power supply. The output end of the voltage detection unit is respectively connected with the first comparator and the second comparator. The output ends of the first comparator and the second comparator are connected with the one-chip microcomputer. Power supply voltage signals are acquired by the power failure detection system and then transmitted to the two comparators with different comparison values so that two comparison signals are obtained. Then a jump time difference of the two comparison signals is processed and calculated by the one-chip microcomputer so that whether power fails or not is judged. Therefore, the AC power failure detection is stably and rapidly completed.
Description
Technical field
The utility model relates to power equipment detection technique field, particularly a kind of detection of power loss system.
Background technology
The develop rapidly of infotech and computer utility day by day universal, make the requirement of the power supply reliability of consumer more and more highlyer, guarantee to guarantee the reliability of power supply the power down of alternating voltage is detected fast.
At present, the method for alternating voltage amplitude detection is had multiple, have based on the RC charging voltage and judge the alternating voltage power-down conditions, that is: first line voltage is carried out to dividing potential drop, then carry out filtering, and then through the RC charging circuit; When line voltage is normal, a constant magnitude of voltage is arranged on electric capacity, after the voltage on electric capacity surpasses or falls the certain limit that this value, just think that electrical network breaks down.The method hardware is realized simple, but to RC to discharge and recharge time requirement accurate, very sensitive to the drift of hardware parameter, affected reliability and the rapidity of detection of power loss.Method based on Theory of Automatic Control is also arranged, that is: using city's electric signal as given, using output voltage amplitude and phase-locked after sinusoidal product as feedback, after being multiplied by a speedup factor, deviation after given anti-reflection feedback regulates through PI, just can the amplitude of its output be judged fast, the weak point of the method is the principle relative complex, to closely related with reference to the sinusoidal phase-locked situation with civil power, in fact is difficult to obtain desirable effect simultaneously.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of simple in structure, stable alternating current power failure detection system swift to operate.
For solving the problems of the technologies described above, the utility model provides a kind of detection of power loss system, comprising: voltage detection unit, the first comparer, the second comparer and single-chip microcomputer; The input end of described voltage detection unit is connected with power supply, obtains power supply voltage signal; The output terminal of described voltage detection unit is connected with the second comparer with described the first comparer respectively; The output terminal of described the first comparer and the second comparer is connected with single-chip microcomputer; Described the first comparer is different from the fiducial value of described the second comparer.
Further, described voltage detection unit comprises voltage transformer (VT); The input end of described voltage transformer (VT) is connected with described power supply, and the output terminal of described voltage transformer (VT) is connected with the second comparer with described the first comparer respectively.
Further, also comprise differential amplifier circuit; The input end of described differential amplifier circuit is connected with the output terminal of described voltage transformer (VT), and the output terminal of described differential amplifier circuit is connected with the input end of the second comparer with described the first comparer respectively.
Further, also comprise rectification circuit; The input end of described rectification circuit is connected with the output terminal of described differential amplifier circuit, and the output terminal of described rectification circuit is connected with the input end of the second comparer with described the first comparer respectively.
Further, described rectification circuit is full-wave rectifying circuit.
The detection of power loss system that the utility model provides is obtained the voltage signal of power supply by voltage detection unit; Via fiducial value, two different comparers draw comparison signal and are transferred to single-chip microcomputer and process and to calculate the bound-time interval of two comparison signals again, and then judge whether power down, and circuit system is simple in structure, swift to operate, reliable and stable.
The accompanying drawing explanation
The structural principle schematic diagram of the detection of power loss system that Fig. 1 provides for the utility model embodiment;
The civil power detection of power loss principle schematic that Fig. 2 provides for the utility model embodiment;
The circuit theory schematic diagram of the differential amplifier circuit that Fig. 3 is the utility model embodiment use;
The circuit theory schematic diagram of the full-wave rectifying circuit that Fig. 4 is the utility model embodiment use.
Embodiment
Referring to Fig. 1, a kind of detection of power loss system that the utility model embodiment provides comprises: voltage detection unit, the first comparer, the second comparer and single-chip microcomputer; The input end of voltage detection unit is connected with power supply, obtains the voltage signal of power supply; The output terminal of voltage detection unit first comparer different from fiducial value and the second comparer respectively is connected, thereby draws the voltage comparison signal that two-way is different; The output terminal of the first comparer and the second comparer is connected with single-chip microcomputer, and the two-way voltage comparison signal is processed and calculated the bound-time interval by single-chip microcomputer, and compares with default power down critical value T, and then judges whether power down; And then provide warning or directly enable standby power supply.
The supply voltage of AC power is often larger, and in order to obtain accurately voltage signal, preferred, voltage detection unit comprises: voltage transformer (VT); Voltage transformer (VT) can adapt to hyperbaric environment better, and obtains quickly and accurately voltage signal.The present embodiment is realized voltage detecting by the 3AH5404-1 type voltage transformer (VT) of Siemens Company.
Voltage signal is transferred to respectively the first different comparer of fiducial value and the second comparer, and the fiducial value different from two be relatively respectively for the alternating voltage of simulation; Voltage is greater than the output high level of fiducial value, and voltage is less than the output low level of fiducial value, and then exports binary comparison signal; In view of the fiducial value of the first comparer and the second comparer arranges difference, comparison signal is also different, and bound-time is also different.The present embodiment adopts the LMH7322 type comparer of National Semiconductor to realize compare operation.
When the two-way voltage comparison signal is transferred to single-chip microcomputer, single-chip microcomputer is processed the bound-time interval of calculating the two-way comparison signal, thereby as power down whether basis for estimation.According to different fiducial values, power down critical value T is also different, for example, usually meets rapidity and the reliability principle of detection of power loss while choosing fiducial value; The present embodiment selects the AVR single-chip microcomputer of atmel corp to complete aforesaid operations.
In the actual power path, tend to occur disturbing factor, for example voltage fluctuation, undesired signal etc.; In order to reduce the impact of above-mentioned disturbing factor on detection of power loss, preferred, differential amplifier circuit is set and is connected between voltage detection unit and the first comparer and the second comparer.Typical differential amplifier circuit as shown in Figure 3 can complete above-mentioned functions.
In order to reduce the interference such as ripple in power circuit, preferred, rectification circuit is set, be connected between differential amplifier circuit and first, second comparer.Further, for the efficiency of boostfiltering, select full-wave rectifying circuit.Classical full-wave rectifying circuit as shown in Figure 4 can complete above-mentioned rectification operation.
Below provide the detection of power loss system that a specific embodiment illustrates the present embodiment.Mains supply runs through the every aspect of productive life as the most conventional AC power, the civil power detection of power loss of below take illustrates the utility model as example.
As shown in Figure 2, in figure, CH1 means the waveform that frequency is 50Hz, the voltage effective value sine wave gained after full-wave rectification that is 220V.CH4 means comparative voltage V
C1, the intersection point of it and waveform CH1 is respectively a, d, e; CH5 means comparative voltage V
C2, the intersection point of it and waveform CH1 is respectively b, c; CH2 means half cycle sine wave and comparative voltage V
C1Level relatively; Waveform CH3 means half cycle sine wave and comparative voltage V
C2Level relatively.
The method of discrimination of the utility model detection of power loss is: after the negative edge that waveform CH2 detected, through T
1The time of (time that a point is ordered to c) does not still detect the negative edge of waveform CH3, and civil power power down in the ac section is described; When the rising edge of waveform CH3 being detected, at T
2The rising edge of waveform CH2 just detected in the time of (time that the c point is ordered to d), illustrate in the power down of cd section civil power; When the rising edge of waveform CH2 being detected, if through T
3The time of (time that the d point is ordered to e) still fails to detect the negative edge of waveform CH2, illustrates in the power down of de section civil power.Based on the above-mentioned theory analysis, the half cycle sine wave has been divided into to tri-sections of ac, cd, de, but the civil power amplitude breaks down in any one section, equal fast detecting is out.
The detection of power loss system that the utility model provides is obtained the voltage signal of power supply by voltage detection unit; Via fiducial value, two different comparers draw comparison signal and are transferred to single-chip microcomputer and process and to calculate the bound-time interval of two comparison signals again, and then judge whether power down.In order to make detection of power loss accurately and reliably, suppress to disturb detection of power loss system that the filtering ripple is further perfect by differential amplifier circuit and full-wave rectifying circuit; The detection of power loss system that the utility model provides, circuit structure is simple, swift to operate, reliable and stable.
It should be noted last that, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although with reference to example, the utility model is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (5)
1. a detection of power loss system, is characterized in that, comprising: voltage detection unit, the first comparer, the second comparer and single-chip microcomputer; The input end of described voltage detection unit is connected with power supply; The output terminal of described voltage detection unit is connected with the second comparer with described the first comparer respectively; The output terminal of described the first comparer and the second comparer is connected with described single-chip microcomputer.
2. detection of power loss system as claimed in claim 1, it is characterized in that: described voltage detection unit comprises voltage transformer (VT); The input end of described voltage transformer (VT) is connected with described power supply, and the output terminal of described voltage transformer (VT) is connected with the second comparer with described the first comparer respectively.
3. detection of power loss system as claimed in claim 2, is characterized in that: also comprise differential amplifier circuit; The input end of described differential amplifier circuit is connected with the output terminal of described voltage transformer (VT), and the output terminal of described differential amplifier circuit is connected with the input end of the second comparer with described the first comparer respectively.
4. detection of power loss system as claimed in claim 3, is characterized in that: also comprise rectification circuit; The input end of described rectification circuit is connected with the output terminal of described differential amplifier circuit, and the output terminal of described rectification circuit is connected with the input end of the second comparer with described the first comparer respectively.
5. detection of power loss system as claimed in claim 4, it is characterized in that: described rectification circuit is full-wave rectifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203479165U CN203324363U (en) | 2013-06-17 | 2013-06-17 | Power failure detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203479165U CN203324363U (en) | 2013-06-17 | 2013-06-17 | Power failure detection system |
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| Publication Number | Publication Date |
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| CN203324363U true CN203324363U (en) | 2013-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013203479165U Expired - Fee Related CN203324363U (en) | 2013-06-17 | 2013-06-17 | Power failure detection system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105764184A (en) * | 2016-03-17 | 2016-07-13 | 宁波市江东精诚自动化设备有限公司 | Wireless intelligent dimming switch |
| CN110045177A (en) * | 2019-04-23 | 2019-07-23 | 深圳市博实结科技有限公司 | Power-down state detection method and power-down state detection system |
| CN110231508A (en) * | 2019-07-09 | 2019-09-13 | 和记奥普泰通信技术有限公司 | Packetizing OTN, PTN, IPRAN, SPN and PON device looses power alarm detection method |
-
2013
- 2013-06-17 CN CN2013203479165U patent/CN203324363U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105764184A (en) * | 2016-03-17 | 2016-07-13 | 宁波市江东精诚自动化设备有限公司 | Wireless intelligent dimming switch |
| CN110045177A (en) * | 2019-04-23 | 2019-07-23 | 深圳市博实结科技有限公司 | Power-down state detection method and power-down state detection system |
| CN110045177B (en) * | 2019-04-23 | 2021-03-30 | 深圳市博实结科技有限公司 | Power failure state detection method and power failure state detection system |
| CN110231508A (en) * | 2019-07-09 | 2019-09-13 | 和记奥普泰通信技术有限公司 | Packetizing OTN, PTN, IPRAN, SPN and PON device looses power alarm detection method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131204 Termination date: 20200617 |