CN205608163U - Power failure detection circuit of electric energy meter - Google Patents
Power failure detection circuit of electric energy meter Download PDFInfo
- Publication number
- CN205608163U CN205608163U CN201620430772.3U CN201620430772U CN205608163U CN 205608163 U CN205608163 U CN 205608163U CN 201620430772 U CN201620430772 U CN 201620430772U CN 205608163 U CN205608163 U CN 205608163U
- Authority
- CN
- China
- Prior art keywords
- detection
- power
- electric capacity
- power loss
- energy meter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 121
- 239000003990 capacitor Substances 0.000 claims abstract description 19
- 230000033228 biological regulation Effects 0.000 claims description 2
- 238000013500 data storage Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 abstract 1
- 238000004804 winding Methods 0.000 description 20
- 238000010586 diagram Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model discloses a power failure detection circuit of electric energy meter, including power failure detection electric capacity, fictitious load and power failure detection chip, power failure detection electric capacity and fictitious load are parallelly connected, the end voltage input power failure detection chip of power failure detection electric capacity, the independent capacitance connection of power failure detection electric capacity adoption is on impulse transformer pair limit, the fictitious load is used for the quick release of energy of power failure detection electric capacity. The utility model discloses an adopt chip capacitor as power failure detection electric capacity alone, because chip capacitor appearance value is minimum, consequently when external power source fell the electricity, power failure detection electric capacity can release its energy of self saving fast, and the terminal voltage also can descend fast, thereby guarantees the utility model discloses the circuit is quicker detects external power source power failure signal, reserves more data storage time for the electric energy meter, the utility model discloses simple structure, only through the extremely low device of incremental cost alright accomplish power failure detection fast, the circuit is reliable, the cost is extremely low.
Description
Technical field
This utility model is specifically related to the power-fail detection circuit of a kind of electric energy meter.
Background technology
Along with development and the raising of people's living standard of national economy technology, electric energy has become as people and produces and one of requisite energy in life.Wherein, electric energy meter is as the of paramount importance metering unit of electric power system, it is desirable to electric energy meter is had the ability when cut-out powered by external power source, at the electric energy measurement data that limited time memory storage is necessary, to ensure the accuracy of electric energy meter continuous data.
Therefore, existing electric energy meter is respectively provided with detection of power loss function: this function, by detection electric energy meter power-off signal, once detects that power-off signal sends control instruction control electric energy meter immediately and carries out data storage, to ensure the accuracy of electric energy metrical.It is illustrated in figure 1 the schematic diagram of existing electric energy meter power-fail detection circuit: power supply output multi-channel output voltage (only having two-way, i.e. Vo2 and Vo3 in figure) after pulse transformer in figure；Power-fail detection circuit is serially connected on the output voltage circuit of arbitrary road (for this road of output voltage Vo2 in figure), utilizes rectifier output voltage Vo1 to do detection of power loss as power-off signal, supply detection of power loss chip；Circuit C4 is that electrochemical capacitor stores energy, also serve as detection of power loss electric capacity simultaneously, R1 is fictitious load, when after input power down, the voltage of Vo1 can not decline at once, and (because the energy on electric capacity C4 can not reduce to zero at once, R1 fictitious load is the energy in order to consume on C4 to need to maintain a period of time, so that capacitance voltage Vo1 faster reduces), detection of power loss chip judges power supply whether power down by the supply voltage of detection chip.Owing to electric energy meter externally fed power supply is essentially fixed value from dump to the time that electric energy meter power down is out of service, therefore during power down data to store the length of available time directly the most directly related with the length of time electric energy meter power down being detected: detect that the time of electric energy meter power down is the shortest, then leave the time that electric energy meter stores for data for the longest.
But, currently used power-fail detection circuit and detection of power loss mode, due to power consumption requirements during system worked well, the value of resistance R1 is restricted, so Vo1 reduces speed and is severely limited, the time of power down is longer to cause electric energy meter to detect, it is certain electric energy meter power-fail detection circuit power-off signal falling waveform schematic diagram as shown in Figure 2: it can be seen that, in figure, electric energy meter is about about 344ms from power cut-off to time power supply power-fail being detected, the longest detection of power loss time, storage time inadequate risk is brought in power failure data storage directly to electric energy meter, greatly have impact on the reliability of electric energy meter.
Utility model content
The purpose of this utility model is to provide the power-fail detection circuit of a kind of electric energy meter that can detect electric energy meter electric source power down rapidly.
The power-fail detection circuit of this electric energy meter that this utility model provides, including detection of power loss electric capacity, fictitious load and detection of power loss chip, detection of power loss electric capacity and fictitious load are in parallel, the terminal voltage of detection of power loss electric capacity inputs detection of power loss chip as detection of power loss voltage, detection of power loss electric capacity uses independent electric capacity to be connected to the pulse transformer secondary of electric energy meter, for detecting the power-off signal of power supply；Fictitious load is used for detection of power loss electric capacity quick release of energy, to shorten the detection of power loss chip detection time to power supply power-fail.
Described detection of power loss electric capacity is patch capacitor.
Described fictitious load is resistance.
Described detection of power loss electric capacity is connected to the pulse transformer secondary of electric energy meter, individually connects the pulse transformer secondary coil of the electric energy meter of a road independence for detection of power loss electric capacity.
The power-fail detection circuit of described electric energy meter also includes output diode and detection of power loss diode；The power supply output cathode of the arbitrary coil of secondary of the pulse transformer of electric energy meter is allocated as two paths of signals, one road signal passes through output diode and controlling circuit of voltage regulation output supply voltage, another road signal exports detection of power loss signal by detection of power loss diode, is connected between detection of power loss signal and ground after detection of power loss electric capacity and fictitious load parallel connection.
The power-fail detection circuit of this electric energy meter that this utility model uses, by individually using patch capacitor as detection of power loss electric capacity, owing to patch capacitor capacitance is minimum, therefore when outside power supply power-fail, detection of power loss electric capacity can quickly discharge the energy of himself storage, the terminal voltage of detection of power loss electric capacity also can rapid decrease, thus ensure that this utility model circuit can detect external power source power-off signal faster than the circuit in background technology, therefore reserve more data retention over time to electric energy meter；This utility model simple in construction, can use single secondary transformer or share existing secondary transformer, and the only device by increasing cost extremely low just can be rapidly completed detection of power loss, and circuit is reliable, and cost is extremely low.
Accompanying drawing explanation
Fig. 1 is the electric energy meter power-fail detection circuit principle schematic of background technology.
Fig. 2 is the electric energy meter power-fail detection circuit power-off signal falling waveform schematic diagram of background technology.
Fig. 3 is the circuit theory diagrams of first embodiment of the present utility model.
Fig. 4 is the circuit theory diagrams of the second embodiment of the present utility model.
Fig. 5 is for using electric energy meter power-fail detection circuit power-off signal falling waveform schematic diagram of the present utility model.
Detailed description of the invention
Being illustrated in figure 3 the circuit theory diagrams of first embodiment of the present utility model: in this embodiment, the former limit input of electric energy meter pulse transformer T1 is power supply after rectification (indicating VIN and GND in figure)；The secondary of pulse transformer has three groups of windings, and wherein first group of winding is the numbered winding of 8,9, and this group winding is out-put supply winding, input power VO3；Second winding that secondary the second winding is numbered 6,7 of pulse transformer, this group winding is similarly power supply winding, its out-put supply VT1；The secondary tertiary winding of pulse transformer is the winding of numbering 10,11, this group winding is the special winding of detection of power loss: in this embodiment, diode D2 is detection of power loss diode, electric capacity C3 is detection of power loss electric capacity, resistance R2 is fictitious load, one group of independent absolute coil of pulse transformer secondary is as special detection of power loss winding, the Same Name of Ends of winding is connected between detection of power loss signal and ground after detection of power loss chip, detection of power loss electric capacity and fictitious load parallel connection by detection of power loss diode output detection of power loss signal V_Drop；Detection of power loss electric capacity C3 uses patch capacitor, and owing to the capacitance of patch capacitor is minimum, therefore patch capacitor is minimum when normal circuit operation for the electrochemical capacitor of the relatively conventional employing of energy of its storage；During normal circuit operation, detection of power loss electric capacity both end voltage is normal value, and the input power power down of once electric energy meter, then transformator can lose energy and quits work, now the energy of storage can be discharged by detection of power loss electric capacity by fictitious load, and along with the decline of capacitance terminal voltage during exergonic；Fictitious load R2 for quickly sponging the energy of electro-detection electric capacity storage when power supply power-fail, the existence of now fictitious load makes the energy of detection of power loss electric capacity quickly to discharge, improve the fall off rate of the terminal voltage of detection of power loss electric capacity, thus the time of detection of power loss chip detection to power supply power-fail is shifted to an earlier date significantly.
Being illustrated in figure 4 the circuit theory diagrams of the second embodiment of the present utility model: in the present embodiment, power-fail detection circuit and an original road power output circuit (out-put supply signal VT1) share the vice-side winding of set of pulses transformator；Now, power-fail detection circuit includes detection of power loss diode D2, detection of power loss electric capacity C3 and fictitious load R2；Output diode D1 is serially connected in power supply output line road foremost, and electrochemical capacitor C4 is output storage capacitor；The Same Name of Ends of transformer secondary winding is connected between detection of power loss signal and ground after detection of power loss chip, detection of power loss electric capacity and fictitious load parallel connection by detection of power loss diode output detection of power loss signal V_Drop；Detection of power loss electric capacity C3 uses patch capacitor, and owing to the capacitance of patch capacitor is minimum, therefore patch capacitor is minimum when normal circuit operation for the electrochemical capacitor of the relatively conventional employing of energy of its storage；During normal circuit operation, detection of power loss electric capacity both end voltage is normal value, and the input power power down of once electric energy meter, then transformator can lose energy and quits work, now the energy of storage can be discharged by detection of power loss electric capacity by fictitious load, and along with the decline of capacitance terminal voltage during exergonic；Fictitious load R2 for quickly sponging the energy of electro-detection electric capacity storage when power supply power-fail, the existence of now fictitious load makes the energy of detection of power loss electric capacity quickly to discharge, improve the fall off rate of the terminal voltage of detection of power loss electric capacity, thus the time of detection of power loss chip detection to power supply power-fail is shifted to an earlier date significantly；The acting as of output diode D1 ensures when power supply power-fail, and the energy of output storage capacitor C4 release cannot export power-fail detection circuit, thus ensures the properly functioning of power-fail detection circuit.
This power-fail detection circuit that this utility model provides, set of pulses transformer secondary winding can be shared with original output power supply circuit, can also individually use one group of vice-side winding, and power-fail detection circuit increase only a diode, a patch capacitor and a resistance, cost is almost negligible, even and if use independent vice-side winding, it is also the most small for the change of pulse transformer, cost the most of the present utility model is almost negligible, and the beneficial effect that it brings is apparent from.After being illustrated in figure 5 application this utility model, electric energy meter power-fail detection circuit power-off signal falling waveform schematic diagram: as we can see from the figure, after application this utility model, the voltage waveform fall off rate at detection of power loss electric capacity two ends improves greatly, voltage declines same amplitude, this utility model only used time about 22ms, 344ms well below background technology, therefore this utility model can greatly increase electric energy meter for the time that power failure data stores, thus fundamentally ensure that the reliability of the continuous data of electric energy meter.
Claims (5)
1. the power-fail detection circuit of an electric energy meter, including detection of power loss electric capacity, fictitious load and detection of power loss chip, detection of power loss electric capacity and fictitious load are in parallel, the terminal voltage of detection of power loss electric capacity inputs detection of power loss chip as detection of power loss voltage, detection of power loss electric capacity is for detecting the power-off signal of power supply, fictitious load is used for detection of power loss electric capacity quick release of energy, to shorten the detection of power loss chip detection time to power supply power-fail, it is characterised in that detection of power loss electric capacity uses independent electric capacity to be connected to the pulse transformer secondary of electric energy meter.
The power-fail detection circuit of electric energy meter the most according to claim 1, it is characterised in that described detection of power loss electric capacity is patch capacitor.
The power-fail detection circuit of electric energy meter the most according to claim 1, it is characterised in that described fictitious load is resistance.
4. according to the power-fail detection circuit of the electric energy meter one of claim 1 ~ 3 Suo Shu, it is characterized in that described detection of power loss electric capacity is connected to the pulse transformer secondary of electric energy meter, individually connect the pulse transformer secondary coil of the electric energy meter of a road independence for detection of power loss electric capacity.
5. according to the power-fail detection circuit of the electric energy meter one of claim 1 ~ 3 Suo Shu, it is characterised in that the power-fail detection circuit of described electric energy meter also includes output diode and detection of power loss diode；The power supply output cathode of the arbitrary coil of secondary of the pulse transformer of electric energy meter is allocated as two paths of signals, one road signal passes through output diode and controlling circuit of voltage regulation output supply voltage, another road signal exports detection of power loss signal by detection of power loss diode, is connected between detection of power loss signal and ground after detection of power loss electric capacity and fictitious load parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620430772.3U CN205608163U (en) | 2016-05-13 | 2016-05-13 | Power failure detection circuit of electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620430772.3U CN205608163U (en) | 2016-05-13 | 2016-05-13 | Power failure detection circuit of electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205608163U true CN205608163U (en) | 2016-09-28 |
Family
ID=56967095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620430772.3U Active CN205608163U (en) | 2016-05-13 | 2016-05-13 | Power failure detection circuit of electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205608163U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107861851A (en) * | 2017-12-08 | 2018-03-30 | 国网冀北电力有限公司电力科学研究院 | Emulation mode and system based on the storage of electric energy meter power failure data |
| CN109324222A (en) * | 2018-11-23 | 2019-02-12 | 江苏林洋能源股份有限公司 | Quick detection of power loss system and method based on reverse exciting topological |
| CN112327023A (en) * | 2020-10-10 | 2021-02-05 | 浙江晨泰科技股份有限公司 | Electric energy meter with equivalent load circuit |
| CN113189536A (en) * | 2021-05-31 | 2021-07-30 | 宁波迦南智能电气股份有限公司 | Power failure detection method and circuit for intelligent meter |
-
2016
- 2016-05-13 CN CN201620430772.3U patent/CN205608163U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107861851A (en) * | 2017-12-08 | 2018-03-30 | 国网冀北电力有限公司电力科学研究院 | Emulation mode and system based on the storage of electric energy meter power failure data |
| CN109324222A (en) * | 2018-11-23 | 2019-02-12 | 江苏林洋能源股份有限公司 | Quick detection of power loss system and method based on reverse exciting topological |
| CN112327023A (en) * | 2020-10-10 | 2021-02-05 | 浙江晨泰科技股份有限公司 | Electric energy meter with equivalent load circuit |
| CN112327023B (en) * | 2020-10-10 | 2023-05-23 | 浙江晨泰科技股份有限公司 | Electric energy meter with equivalent load circuit |
| CN113189536A (en) * | 2021-05-31 | 2021-07-30 | 宁波迦南智能电气股份有限公司 | Power failure detection method and circuit for intelligent meter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205608163U (en) | Power failure detection circuit of electric energy meter | |
| CN103378636A (en) | Mobile power source control chip and mobile power source with same | |
| CN202189085U (en) | Total voltage loss detection chip and electric energy meter | |
| CN101841187A (en) | Power management power supply system for electronic electric energy meter | |
| CN207069553U (en) | A kind of control circuit for realizing hardware watchdog and automatic time delay break-make Electricity Functional | |
| WO2019218882A1 (en) | Super-capacitor application circuit of replaceable battery type smart electric energy meter power supply | |
| CN113472056A (en) | Dual-power supply system of remote intelligent gas meter | |
| CN205983517U (en) | A power saving circuit for passive label | |
| CN106209050A (en) | A kind of electronic switching circuit of low cost low-power consumption | |
| CN102299617A (en) | Automatic voltage switch and implementation method thereof | |
| CN207732504U (en) | Power supply automatic switchover circuit and intelligent electric meter microcontroller chip | |
| CN210724306U (en) | Power failure emergency processing system and chip | |
| CN203535107U (en) | Low power AC power-off alarming circuit | |
| CN209462050U (en) | Standby capacitor charge and discharge circuit and its fault detector | |
| CN201344951Y (en) | Power failure detection circuit | |
| CN107302311A (en) | Ultralow input power energy supply circuit for passive sensory network and the energy supply method using the circuit realiration | |
| CN104181380A (en) | Light load current detection system | |
| CN104567825A (en) | Hydrological telemeter | |
| CN111308192A (en) | Zero line-falling electricity-stealing-prevention metering device based on reset-prevention device | |
| CN208224355U (en) | A kind of alternating current undervoltage detection warning circuit | |
| CN107293319A (en) | Stand-by power supply detection method and device | |
| CN107144725B (en) | Novel method for small current detection | |
| CN203301796U (en) | Control circuit for LED AC (alternating current) drive | |
| CN209641354U (en) | The circuit that power down Flash is saved is realized in embedded systems | |
| CN103777533B (en) | A kind of signal behavior output circuit and control chip and control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170125 Address after: 410003, Changsha, Yuelu District, silver basin Ling Ling Street, No. 359 South Road, No., No. two, 1-5 Patentee after: HUNAN SHENG AND ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 410205 Tongzi, Changsha, Changsha hi tech Development Zone, west slope road, No. 468, Patentee before: WASION Group Ltd. |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: The two phase of the project wasion Technology Park No. 468 Tongzi high tech Development Zone, Hunan province Changsha road 410205 No. 11 building 101 floor No. 1-8 Patentee after: HUNAN SEEHRE POWER TECHNOLOGY CO.,LTD. Address before: 410003, Changsha, Yuelu District, silver basin Ling Ling Street, No. 359 South Road, No., No. two, 1-5 Patentee before: HUNAN SHENG AND ELECTRONIC TECHNOLOGY Co.,Ltd. |
|
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: The two phase of the project wasion Technology Park No. 468 Tongzi high tech Development Zone in Hunan province Changsha slope 410205 West Road No. 11 building 101 floor No. 1-8 Patentee after: HUNAN SEEHRE POWER TECHNOLOGY CO.,LTD. Address before: The two phase of the project wasion Technology Park No. 468 Tongzi high tech Development Zone, Hunan province Changsha road 410205 No. 11 building 101 floor No. 1-8 Patentee before: HUNAN SEEHRE POWER TECHNOLOGY CO.,LTD. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231027 Address after: Room 101, 3rd Floor, Building 11, Phase II of Weisheng Science and Technology Park, No. 468 Tongzipo West Road, High tech Development Zone, Changsha City, Hunan Province, 410205 Patentee after: Hunan Shenghe Intelligent Control Technology Co.,Ltd. Address before: 410205 no.1-8, 3rd floor, 101, No.11 plant, phase II project, Weisheng Science Park, no.468, tongzipo West Road, high tech Development Zone, Changsha City, Hunan Province Patentee before: HUNAN SEEHRE POWER TECHNOLOGY CO.,LTD. |