CN206311665U - A kind of intelligent electric energy meter doubleclocking source sampling device - Google Patents
A kind of intelligent electric energy meter doubleclocking source sampling device Download PDFInfo
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- CN206311665U CN206311665U CN201621225767.5U CN201621225767U CN206311665U CN 206311665 U CN206311665 U CN 206311665U CN 201621225767 U CN201621225767 U CN 201621225767U CN 206311665 U CN206311665 U CN 206311665U
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Abstract
A kind of intelligent electric energy meter doubleclocking source sampling device, it includes network voltage detection module, mains frequency clock sampling module, crystal clock sampling module, MCU and battery, described network voltage detection module is used to detect the voltage status of AC network, its signal output part is connected with the corresponding voltage detection signal input of MCU, described mains frequency clock sampling module and crystal clock sampling module connects AC network and crystal respectively, for being sampled to clock signal, the signal output part of mains frequency clock sampling module and crystal clock sampling module is connected with the corresponding clock signal input terminal of MCU, the power supply signal termination battery of described crystal clock sampling module.The utility model can whether there is electric situation switching clock according to power network, realize the long-term accurate timing of clock.
Description
Technical field
The utility model is related to the electric energy metrical field of electric energy meter, and alternating current is utilized specifically on intelligent electric energy meter
The characteristics of net frequency source long-time stability and crystal are powering the characteristics of remaining to normal work in fact after grid power blackout by battery
The device of the existing long-term accurate timing of electric energy meter real-time clock.
Background technology
At present, with the high speed development of intelligent grid, intelligent electric energy meter needs an onboard clock benchmark to be come to electric energy
Amount carries out time-shared charge, and to logout, load curve, settlement data is recorded according to the time, query statistic after being easy to.
Clock on intelligent electric energy meter will meet IEC62054-21 standards, and it meets in 23 ° of lower clock accuracy errors of normal temperature<±0.5s/
D, ensures clock accuracy within ± 0.15s/ DEG C/d at -20 DEG C ~ 70 DEG C.Current most of clock of power meter source is come
Source is inside 32.768KHZ crystal oscillators, realizes that clock of power meter runs by the sampling to crystal oscillator frequency.Crystal oscillator individual difference compares
Greatly, ambient temperature, humidity has an impact to frequency of oscillation, and clock accuracy is caused if row clock temperature-compensating is not entered in time
Deviation is larger, and the time is inaccurate, finally measures rate and loses accuracy.Therefore all using the frequency of compensation crystal oscillator temperature influence
Partially, it is ensured that crystal oscillator can export correct frequency under various temperature environments.Even if in addition by the way that crystalline substance can be improved after temperature-compensating
The accuracy of body frequency, but crystal has a frequency aging rate after long-term work（Vibration is measured under constant environmental condition
During device frequency, the relation between oscillator frequency and time.This long-term frequency drift is by crystal element and pierce circuit
The slowly varying of element is caused, ± 2ppm/（First Year）With ± 20ppm/（10 years））.Therefore after the several years is run, crystal
Than larger, clock accuracy may be above standard requirement for influence of the frequency deviation to clock.
, as the clocking scheme in clock sampling source, can not be influenceed by crystal oscillator frequency deviation, power network with to AC network frequency
Frequency is steady in a long-term and frequency deviation very little and is not influenced by temperature, therefore when can meet in electric energy meter life cycle
The requirement of clock precision.But in electric energy meter actual moving process, the such electric energy meter of power network occasional power failure is just sampled less than electricity
The rate-adaptive pacemaker of net, also just without clock source, electric energy meter can lose clock timing function.
The content of the invention
The purpose of this utility model is to solve on electric energy meter to the real-time clock requirement of accurate timing steadily in the long term
A kind of intelligent electric energy meter doubleclocking source sampling device is proposed, electric situation switching clock can be whether there is according to power network, realize clock
Long-term accurate timing.
The technical solution of the utility model is：
A kind of intelligent electric energy meter doubleclocking source sampling device, it includes network voltage detection module, mains frequency clock
Sampling module, crystal clock sampling module, MCU and battery, described network voltage detection module are used to detect AC network
Voltage status, its signal output part is connected with the corresponding voltage detection signal input of MCU, described mains frequency clock sampling
Module and crystal clock sampling module connect AC network and crystal respectively, for being sampled to clock signal, during mains frequency
The signal output part of clock sampling module and crystal clock sampling module is connected with the corresponding clock signal input terminal of MCU, described
Crystal clock sampling module power supply signal termination battery.
Two sets are provided with inside MCU of the present utility model and correspond to mains frequency clock sampling module and crystal clock sampling mould
The clock register of block.
Crystal clock sampling module of the present utility model is the sampling module inside external sampling module or MCU.
Network voltage detection module of the present utility model include resistance R171-R172, R175-R177, electric capacity C121,
C124, voltage-regulator diode D42 and triode Q12, DC voltage DC16V, the other end and voltage stabilizing are accessed in described resistance R175 one end
Pipe D42 negative poles are connected, and voltage-stabiliser tube D42 positive poles be connecteds with resistance R176, electric capacity C124, resistance R177 one end, electric capacity C124 and electric
Resistance R177 is in parallel and the other end is grounded, and the resistance R176 other ends are connected with triode Q12 base stages, triode Q12 grounded emitters,
Triode Q12 colelctor electrodes are connected with resistance R171, resistance R172 one end, the voltage signal of another termination AC networks of resistance R171
Collection terminal VDD3V3, the resistance R172 other ends be connected with electric capacity C121 one end after as network voltage detection module detection signal
Output is connected to MCU pin VININT, electric capacity C121 other ends ground connection.
Mains frequency clock sampling module of the present utility model includes resistance R5-R13, R15 and electric capacity C3, the resistance
One end of R5 is single-phase voltage U, resistance R5 as the clock sampling signal termination AC network of mains frequency clock sampling module
The other end be sequentially connected in series resistance R6-R12, the resistance R12 other ends are connected with one end of resistance R13, resistance R15, and resistance R15 is another
One end is grounded, and the resistance R13 other ends are connected to MCU after being connected with electric capacity C3 one end as the output of mains frequency clock sampling module
Pin VP1, electric capacity the C3 other end are grounded.
The beneficial effects of the utility model：
In the utility model, this mains frequency can meet electric energy meter elapsed time clock completely when power network has electricity
It is required that, the annual number of times having a power failure and time are all little now, and this data is a major control data of power supply department, therefore
Electric energy meter will lose the signal to mains frequency sampling after actually used middle power-off, and this when, electric energy meter also can be by electricity
Pond is powered such as crystal oscillating circuit to partial circuit, and the reason for the crystal oscillator on electric energy meter considers cost, its precision can be with
Not doing too high request, and can be by other equipment carries out factory's internal calibration.Therefore its precision is also to comply fully with clock
Requirement, therefore clock source could switch to crystal oscillator powering mode after grid cut-off, such simple structure, easy to use,
Disclosure satisfy that the market demand.
Brief description of the drawings
Fig. 1 is theory diagram of the present utility model.
Fig. 2 is the circuit diagram of network voltage detection module of the present utility model.
Fig. 3 is the circuit diagram of mains frequency clock sampling module of the present utility model.
Specific embodiment
The utility model is further described with reference to the accompanying drawings and examples.
As shown in figure 1, a kind of intelligent electric energy meter doubleclocking source sampling device, it includes network voltage detection module, electricity
Net frequency clock sampling module, crystal clock sampling module, MCU and battery, described network voltage detection module are used to detect
The voltage status of AC network, its signal output part is connected with the corresponding voltage detection signal input of MCU, and described power network is frequently
Rate clock sampling module and crystal clock sampling module connect AC network and crystal respectively, for being sampled to clock signal,
The signal output part of mains frequency clock sampling module and crystal clock sampling module with the corresponding clock signal input terminal of MCU
It is connected, the power supply signal of described crystal clock sampling module terminates battery.
During specific implementation：
When AC network has electricity, the clock of electric energy meter uses the value of mains frequency source clock register.To AC network
Frequency sampling scheme be that the voltage signal of power network is done modulation conversion into be able to can be recognized by the master controller MCU of ammeter
Level signal, when electricity on ammeter, the clock register value in crystal clock source is synchronized in AC network clock source register,
Then realize that mains frequency is sampled using the A/D interfaces of the MCU on intelligent electric energy meter, usual mains frequency is 50Hz, that is,
One cycle is 20ms, has zero cross signal twice to produce per 20ms power networks, therefore by detecting that zero cross signal just can be to electric energy
During meter, a zero cross signal is often detected, clock adds up 10ms, and time data is turned by Time Calculation function on electric energy meter
Change the clock data that ammeter can be used into, and real-time update is in mains frequency clock register.When ammeter is powered off, friendship
Stream power network clock source register value is synchronized in the clock register in crystal clock source, and ammeter relies on backup battery pair after a loss of power
Clock circuit is powered and realizes real-time clock function.It is this when thering is the whether electric method for carrying out clock source switching to meet according to power network
The requirement of clock accurate timing reliably and with long-term.
The utility model is not directed to partly same as the prior art or can be realized using prior art.
Claims (5)
1. a kind of intelligent electric energy meter doubleclocking source sampling device, it is characterized in that it includes network voltage detection module, power network frequently
Rate clock sampling module, crystal clock sampling module, MCU and battery, described network voltage detection module are used to detect exchange
The voltage status of power network, its signal output part is connected with the corresponding voltage detection signal input of MCU, during described mains frequency
Clock sampling module and crystal clock sampling module connect AC network and crystal respectively, for being sampled to clock signal, power network
The signal output part of frequency clock sampling module and crystal clock sampling module clock signal input terminal phase corresponding with MCU
Even, the power supply signal termination battery of described crystal clock sampling module.
2. intelligent electric energy meter according to claim 1 doubleclocking source sampling device, it is characterized in that being set inside described MCU
There are two sets of clock registers for corresponding to mains frequency clock sampling module and crystal clock sampling module.
3. intelligent electric energy meter according to claim 1 doubleclocking source sampling device, it is characterized in that described crystal clock
Sampling module is the sampling module inside external sampling module or MCU.
4. intelligent electric energy meter according to claim 1 doubleclocking source sampling device, it is characterized in that described line voltage
Detection module includes resistance R171-R172, R175-R177, electric capacity C121, C124, voltage-regulator diode D42 and triode Q12, institute
State resistance R175 one end and access DC voltage DC16V, the other end is connected with voltage-stabiliser tube D42 negative poles, voltage-stabiliser tube D42 positive poles and resistance
R176, electric capacity C124, the connection of resistance R177 one end, electric capacity C124 is in parallel with resistance R177 and the other end is grounded, and resistance R176 is another
One end is connected with triode Q12 base stages, triode Q12 grounded emitters, triode Q12 colelctor electrodes and resistance R171, resistance
R172 one end connect, resistance R171 it is another termination AC network voltage signal acquisition end VDD3V3, the resistance R172 other ends with
Detection signal output after the connection of electric capacity C121 one end as network voltage detection module is connected to MCU pin VININT, electric capacity
The C121 other ends are grounded.
5. intelligent electric energy meter according to claim 1 doubleclocking source sampling device, it is characterized in that described mains frequency
Clock sampling module includes resistance R5-R13, R15 and electric capacity C3, and one end of the resistance R5 is used as mains frequency clock sampling
The clock sampling signal termination AC network of module is single-phase voltage U, and the other end of resistance R5 is sequentially connected in series resistance R6-R12, electricity
The resistance R12 other ends are connected with one end of resistance R13, resistance R15, and the resistance R15 other ends are grounded, the resistance R13 other ends and electric capacity
After the connection of C3 one end MCU pin VP1, electric capacity C3 other ends ground connection are connected to as the output of mains frequency clock sampling module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621225767.5U CN206311665U (en) | 2016-11-15 | 2016-11-15 | A kind of intelligent electric energy meter doubleclocking source sampling device |
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| CN201621225767.5U CN206311665U (en) | 2016-11-15 | 2016-11-15 | A kind of intelligent electric energy meter doubleclocking source sampling device |
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| CN206311665U true CN206311665U (en) | 2017-07-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108957119A (en) * | 2018-09-19 | 2018-12-07 | 钜泉光电科技(上海)股份有限公司 | Biradical quasi- mutually inspection electrical parameter detection circuit and the electric energy computation chip of sample circuit |
| CN112181047A (en) * | 2020-09-03 | 2021-01-05 | 华帝股份有限公司 | Self-adaptive method based on power grid power frequency clock source |
-
2016
- 2016-11-15 CN CN201621225767.5U patent/CN206311665U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108957119A (en) * | 2018-09-19 | 2018-12-07 | 钜泉光电科技(上海)股份有限公司 | Biradical quasi- mutually inspection electrical parameter detection circuit and the electric energy computation chip of sample circuit |
| CN112181047A (en) * | 2020-09-03 | 2021-01-05 | 华帝股份有限公司 | Self-adaptive method based on power grid power frequency clock source |
| CN112181047B (en) * | 2020-09-03 | 2023-08-11 | 华帝股份有限公司 | Self-adaptive method based on power frequency clock source of power grid |
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