CN203688642U - Power failure detection circuit - Google Patents
Power failure detection circuit Download PDFInfo
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- CN203688642U CN203688642U CN201320718078.8U CN201320718078U CN203688642U CN 203688642 U CN203688642 U CN 203688642U CN 201320718078 U CN201320718078 U CN 201320718078U CN 203688642 U CN203688642 U CN 203688642U
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- 238000001514 detection method Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 abstract description 6
- 239000003990 capacitor Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Abstract
The utility model discloses a power failure detection circuit comprising a voltage-dividing resistor, a diode, and a photoelectric coupler. The two ends of the voltage-dividing resistor are connected with a 220V power supply and the positive pole of a light-emitting diode of the photoelectric coupler, respectively. The negative pole of the light-emitting diode of the photoelectric coupler is connected with the positive pole of the diode. The emitter electrode of a photosensitive triode of the photoelectric coupler is connected with the signal input end of a single-chip microcomputer. According to the power failure detection circuit, whether 220V power is supplied is directly detected by the photoelectric coupler. The photoelectric coupler is capable of determining whether power failure generates immediately or within short time. In other words, operating time for the single-chip microcomputer to process power failure is added. The power failure detection circuit is simple and reliable.
Description
Technical field
The utility model relates to a kind of power-fail detection circuit.
Background technology
Fig. 1 shows the circuit diagram of the power-fail detection circuit of electric energy meter in prior art, as shown in Figure 1, in power-fail detection circuit, 12 power supplys connect the input end of three-terminal voltage-stabilizing integrated chip U2 by the first resistance R 1, and 12V power supply is also sequentially by the first resistance R 1 and the second resistance R 2 ground connection; The negative pole of voltage stabilizing diode D1 is electrically connected with the input end of three-terminal voltage-stabilizing integrated chip U2, the plus earth of voltage stabilizing diode D1; The output terminal of three-terminal voltage-stabilizing integrated chip U2 connects the signal input part of single-chip microcomputer U1, and the output terminal of three-terminal voltage-stabilizing integrated chip U2 also connects 5V power supply by the 3rd resistance R 3; Single-chip microcomputer U1 is also connected with the first capacitor C 1 that capacitance is larger.
In prior art, the principle of work of the power-fail detection circuit of electric energy meter is: single-chip microcomputer U1, by judging whether the voltage of its signal input part drops to default threshold voltage and determine whether to occur power down, is determining that after generation power down, single-chip microcomputer U1 carries out power down process.
In prior art, the defect of the power-fail detection circuit of electric energy meter is: because 12V mains side has the first capacitor C 1 that capacitance is larger, the first capacitor C 1 impels 12V voltage drop slow, that is to say that to input to the voltage drop of single-chip microcomputer U1 signal input part slow, thereby in the time there is power-down conditions, single-chip microcomputer U1 need to wait until when the voltage drop of its input end arrives default threshold voltage, could determine power down phenomenon has occurred, then just can carry out power down process, therefore leave the running time that single-chip microcomputer U1 carries out power down process for also just very short.
Utility model content
The purpose of this utility model is to overcome deficiency of the prior art, and a kind of power-fail detection circuit that can shorten the detection of power loss time is provided.
For achieving the above object, described power-fail detection circuit, comprises divider resistance, diode and photoelectrical coupler, wherein:
The two ends of described divider resistance connect respectively the positive pole of the light emitting diode of power supply and described photoelectrical coupler, and the negative pole of the light emitting diode of described photoelectrical coupler connects the positive pole of described diode, the minus earth of described diode; The emitter of the phototriode of described photoelectrical coupler connects the signal input part of single-chip microcomputer, and described single-chip microcomputer judges whether to occur power down according to the output level of described emitter.
Preferably, described power-fail detection circuit also comprises the 5th resistance and the second electric capacity, and described the 5th resistance and the second electric capacity are all connected in parallel between the positive pole and negative pole of light emitting diode of described photoelectrical coupler.
Preferably, described power-fail detection circuit also comprises the 6th resistance and the 3rd electric capacity, and described the 6th resistance and the 3rd electric capacity are all connected in parallel between the emitter and ground of phototriode of described photoelectrical coupler.
Preferably, the model of described single-chip microcomputer is FM3307.
Preferably, described power supply is 220V power supply.
The beneficial effects of the utility model are, described power-fail detection circuit, have power free mode by photoelectrical coupler direct-detection, single-chip microcomputer can learn whether power-down conditions occurs immediately or in a short period of time, that is to say the running time that has increased single-chip microcomputer and carry out power down process; Described power-fail detection circuit is simple and reliable.
Brief description of the drawings
Fig. 1 shows the circuit diagram of the power-fail detection circuit of electric energy meter in prior art.
Fig. 2 shows the circuit diagram of power-fail detection circuit described in the utility model.
Description of reference numerals
D1 voltage stabilizing diode R6 the 6th resistance
D2 diode C1 the first electric capacity
R1 first resistance C2 the second electric capacity
R2 the second resistance C3 the 3rd electric capacity
R3 the 3rd resistance U1 single-chip microcomputer
R4 divider resistance U2 three-terminal voltage-stabilizing integrated chip
R5 the 5th resistance U3 photoelectrical coupler
Embodiment
Describe embodiment of the present utility model below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Be exemplary below by the embodiment being described with reference to the drawings, only for explaining the utility model, and can not be interpreted as restriction of the present utility model.
Fig. 2 shows the circuit diagram of power-fail detection circuit described in the utility model, and as shown in Figure 2, described power-fail detection circuit comprises divider resistance R4, diode D2 and photoelectrical coupler U3.
At length, the two ends of described divider resistance R4 connect respectively the positive pole of the light emitting diode of power supply and described photoelectrical coupler U3, and the negative pole of the light emitting diode of described photoelectrical coupler U3 connects the positive pole of described diode D2, the minus earth of described diode D2; The emitter of the phototriode of described photoelectrical coupler U3 connects the signal input part (42 pin) of single-chip microcomputer U1.The model of above-mentioned single-chip microcomputer U1 is for being preferably FM3307.Described power supply is preferably 220V power supply.
Further, described power-fail detection circuit also comprises the 5th resistance R 5 and the second capacitor C 2, described the 5th resistance R 5 and the second capacitor C 2 are all connected in parallel between the positive pole and negative pole of light emitting diode of described photoelectrical coupler U3, and the second capacitor C 2 is filter capacitor, for filtering high frequency clutter.And, described power-fail detection circuit also comprises the low-pass filter being made up of the 6th resistance R 6 and the 3rd capacitor C 3, further filtering high frequency clutter, described the 6th resistance R 6 and the 3rd capacitor C 3 are all connected in parallel between the emitter and ground of phototriode of described photoelectrical coupler U3.
The principle of work of described power-fail detection circuit is: 220V power supply directly connects the input end (positive pole of the light emitting diode of photoelectrical coupler U3) of photoelectrical coupler U3, the output terminal (emitter of the phototriode of photoelectrical coupler U3) of photoelectrical coupler U3 directly inputs to single-chip microcomputer U1 by the switching signal (high level signal or low level signal) that has or not 220V voltage for reflecting: in the time there is not power down, 220V power supply remains and being connected of the input end of photoelectrical coupler U3, photoelectrical coupler U3 remains conducting state, thereby the output terminal of photoelectrical coupler U3 continues the signal input part transmission high level signal to single-chip microcomputer U1.In the time there is power down, because the input end of 220V power supply and photoelectrical coupler U3 disconnects, not conducting of photoelectrical coupler U3, thereby the output terminal of photoelectrical coupler U3 is to the signal input part transmission low level signal of single-chip microcomputer U1, because photoelectrical coupler U3 is quick for having or not the reaction of connection 220V voltage, so single-chip microcomputer U1 can learn whether power-down conditions occurs immediately or in a short period of time, thereby the running time that makes single-chip microcomputer U1 carry out power down process has increased.
What deserves to be explained is, power-fail detection circuit described in the utility model can be applied in electric energy meter, on the circuit board of electric energy meter casing inside, is provided with this power-fail detection circuit, for the instant detection of power-down conditions.
Describe structure of the present utility model, feature and action effect in detail according to the embodiment shown in graphic above; the foregoing is only preferred embodiment of the present utility model; but the utility model does not limit practical range with shown in drawing; every change of doing according to conception of the present utility model; or be revised as the equivalent embodiment of equivalent variations; when not exceeding yet instructions and illustrating contain spiritual, all should be in protection domain of the present utility model.
Claims (5)
1. a power-fail detection circuit, is characterized in that, described power-fail detection circuit comprises divider resistance, diode and photoelectrical coupler, wherein:
The two ends of described divider resistance connect respectively the positive pole of the light emitting diode of power supply and described photoelectrical coupler, and the negative pole of the light emitting diode of described photoelectrical coupler connects the positive pole of described diode, the minus earth of described diode; The emitter of the phototriode of described photoelectrical coupler connects the signal input part of single-chip microcomputer, and described single-chip microcomputer judges whether to occur power down according to the output level of described emitter.
2. power-fail detection circuit according to claim 1, it is characterized in that, described power-fail detection circuit also comprises the 5th resistance and the second electric capacity, and described the 5th resistance and the second electric capacity are all connected in parallel between the positive pole and negative pole of light emitting diode of described photoelectrical coupler.
3. power-fail detection circuit according to claim 1, it is characterized in that, described power-fail detection circuit also comprises the 6th resistance and the 3rd electric capacity, and described the 6th resistance and the 3rd electric capacity are all connected in parallel between the emitter and ground of phototriode of described photoelectrical coupler.
4. according to the power-fail detection circuit described in any one in claims 1 to 3, it is characterized in that, the model of described single-chip microcomputer is FM3307.
5. according to the power-fail detection circuit described in any one in claims 1 to 3, it is characterized in that, described power supply is 220V power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320718078.8U CN203688642U (en) | 2013-11-14 | 2013-11-14 | Power failure detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320718078.8U CN203688642U (en) | 2013-11-14 | 2013-11-14 | Power failure detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203688642U true CN203688642U (en) | 2014-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320718078.8U Expired - Lifetime CN203688642U (en) | 2013-11-14 | 2013-11-14 | Power failure detection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN203688642U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917403A (en) * | 2015-05-25 | 2015-09-16 | 张家港市华为电子有限公司 | Automatic switching circuit in power supply applicable to 220V and 110V power grids |
| CN110095737A (en) * | 2018-01-31 | 2019-08-06 | 上海安浦鸣志自动化设备有限公司 | A kind of circuit and method of AC servo driver control power supply power-fail detection |
| CN110687837A (en) * | 2019-08-30 | 2020-01-14 | 浙江威星智能仪表股份有限公司 | Power failure detection circuit based on single chip microcomputer |
| CN112147537A (en) * | 2020-09-18 | 2020-12-29 | 青鸟消防股份有限公司 | Circuit and method for detecting open circuit and short circuit of load |
| CN112649757A (en) * | 2020-12-30 | 2021-04-13 | 万帮数字能源股份有限公司 | Charging pile off-line detection and identification system and method |
-
2013
- 2013-11-14 CN CN201320718078.8U patent/CN203688642U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917403A (en) * | 2015-05-25 | 2015-09-16 | 张家港市华为电子有限公司 | Automatic switching circuit in power supply applicable to 220V and 110V power grids |
| CN110095737A (en) * | 2018-01-31 | 2019-08-06 | 上海安浦鸣志自动化设备有限公司 | A kind of circuit and method of AC servo driver control power supply power-fail detection |
| CN110687837A (en) * | 2019-08-30 | 2020-01-14 | 浙江威星智能仪表股份有限公司 | Power failure detection circuit based on single chip microcomputer |
| CN112147537A (en) * | 2020-09-18 | 2020-12-29 | 青鸟消防股份有限公司 | Circuit and method for detecting open circuit and short circuit of load |
| CN112649757A (en) * | 2020-12-30 | 2021-04-13 | 万帮数字能源股份有限公司 | Charging pile off-line detection and identification system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 3, No. Patentee after: QINGDAO SHIZE POWER TECHNOLOGY CO.,LTD. Address before: Zhuzhou Dongtai Road, Laoshan District 266100 in Shandong province Qingdao City Keda Industrial Park on the third floor Patentee before: QINGDAO SHIZE ELECTRONIC METER Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 266100 No. 3 Zhuzhou Road, Laoshan District, Qingdao City, Shandong Province Patentee after: Qingdao Shize Intelligent Technology Co.,Ltd. Address before: 266100 No. 3 Zhuzhou Road, Laoshan District, Qingdao City, Shandong Province Patentee before: QINGDAO SHIZE POWER TECHNOLOGY CO.,LTD. |
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| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140702 |
|
| CX01 | Expiry of patent term |