CN202661540U - Three-phase total-voltage-loss detecting circuit - Google Patents
Three-phase total-voltage-loss detecting circuit Download PDFInfo
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- CN202661540U CN202661540U CN 201220282370 CN201220282370U CN202661540U CN 202661540 U CN202661540 U CN 202661540U CN 201220282370 CN201220282370 CN 201220282370 CN 201220282370 U CN201220282370 U CN 201220282370U CN 202661540 U CN202661540 U CN 202661540U
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Abstract
The utility model discloses a three-phase total-voltage-loss detecting circuit, which comprises a current sampling unit, a current passage selection unit, a signal amplification unit, a threshold comparison unit and a host system, wherein the signal is transmitted to the current passage selection unit through the current sampling unit and is then transmitted to the threshold comparison unit after being transmitted to the signal amplification unit, and the finally obtained signal is transmitted to the host system. The three-phase total-voltage-loss detecting circuit has the advantages that the structure is reasonable, the power consumption is ultralow, the cost is low, the structure is simple and reliable, much software work is not needed, and the reliability of the whole machine system is high.
Description
Technical field
The utility model relates to a kind of full decompression testing circuit of three phases electronic energy meter, is applicable to the three-phase electric energy metering field.
Background technology
When the unexpected fusing of the fuse in PT loop in the power-supply unit, can cause what of normally metering user electric weight consumption, in order rationally to remedy electric weight, reduce the loss of power supply department, need to be with full decompression measuring ability on some electric energy meters.Full decompression refers to all be lower than electric energy meter critical voltage (refer to the voltage that electric energy meter can normally start, general provision is 70% fundamental voltage) when three-phase voltage (single-phase meter is single-phase voltage), and load current is greater than a kind of operating mode of 5% specified (substantially) electric current.In order to detect in real time this operating mode, in the situation that loses the electric network source power supply, electric energy meter need periodically (≤60s) detect the three-phase load electric current, judge whether to judge whether to be in full decompression state greater than 5% specified (substantially) current value with this.When electric energy meter determines full decompression state, the moment that needs the full decompression of record to occur, and record the current effective value in this moment.When electric energy meter carries out full decompression detection, there is not the electric network source power supply, so backup battery that this moment, electric energy meter consumed, and the backup battery of electric energy meter is to adopt non-rechargeabel lithium battery at present, and the life requirements in 3 years is arranged, so require very high to power consumption, need to be in 10uA, present electric energy meter mostly CPU (central processing unit) adds the allomeric function that the computation chip mode realizes electric energy meter, and existing computation chip underintegration is high, not in ultralow merit
The function that can automatically realize full decompression detection of consumption, so present most way be by CPU cycle open computation chip and detect current value, to judge whether to be in full decompression state, such way power consumption is very large, and battery life shortens greatly.
Low power capabilities when detecting in order to improve full decompression, simplify the method that full decompression detects, reduce the cost that full decompression detects, improve the versatility of full decompression measuring ability, proposed a lot of solutions such as Chinese patent 201120063013.5 " a kind of full voltage loss detection chip and electric energy meter ", Chinese patent 2009202559222.X " the full decompression module that is used for three phases electronic energy meter " etc., but all can not tackle the problem at its root.
Summary of the invention
It is a kind of rational in infrastructure that the purpose of this utility model is to provide, and can effectively solve three-phase electric energy meter when processing full decompression function, and software function is complicated, the full decompression testing circuit of the three-phase of the large problem of power consumption.
Technical solution of the present utility model is:
The full decompression testing circuit of a kind of three-phase is characterized in that: comprise current sampling unit, current channel selected cell, signal amplification unit, threshold value comparing unit and host computer system; Wherein signal transfers to the current channel selected cell by current sampling unit, after transfer to signal amplification unit, transfer to again the threshold value comparing unit, the signal that obtains at last is transferred to host computer system.
The channel selecting unit is controlled by host computer system.
Host computer system is with computation chip, and the current sampling unit output signal supplies the host computer system computation chip used simultaneously.
The utility model is rational in infrastructure, and super low-power consumption is with low cost, and is simple and reliable for structure, does not need a large amount of software works, and the machine system reliability is high.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is block diagram of the present utility model.
Fig. 2 is the circuit diagram of the new real-time type of this practicality.Wherein: 1, current sampling unit; 2, current channel selected cell; 3, signal amplification unit; 4, threshold value comparing unit.
Fig. 3 is that processing flow chart is interrupted in host system software sampling of the present utility model.
Embodiment
Can find out that such as Fig. 1 the utlity model has current sampling unit, current channel selected cell, signal amplification unit, threshold value comparing unit and host computer system consists of.Wherein signal transfers to the current channel selected cell by current sampling unit, after transfer to signal amplification unit, transfer to again the threshold value comparing unit, the signal that obtains at last is transferred to host computer system, control is responsible for by host computer system in the channel selecting unit.The current sampling unit output signal supplies the host computer system computation chip used simultaneously, is used for the host computer system electric energy metrical.
Can find out such as Fig. 2, electric current of the present utility model adopts the unit to be made of mutual inductor CT1-CT3, resistance R 1-R12, capacitor C 1-C6, after the industrial frequency AC electric current signal in the supply line reduces in proportion through Current Transmit 1, CT2 and CT3, become ac voltage signal by resistance R 1-R12 with the processing of circuit that capacitor C 1-C6 forms again.This signal is used to offer the current channel selected cell to carry out also supplying with simultaneously host computer system and carrying out electric energy metrical outside the switching of three-phase channel selecting.
As seen from Figure 2, channel selecting of the present utility model unit is to be made of a low-power consumption analog switch chip U1 and resistance R 13-R18, capacitor C 7-C10, C7-C9 is mainly used to the isolated DC signal, the transmission power frequency component, then setover in case the stop signal distortion through R13-R18, again by host computer system control simulation switch.When the three phase supply power supply all is lower than critical voltage, host computer system is in dormant state at ordinary times, take time of≤60S as the cycle, automatically switch to low power consumpting state from dormant state, host computer system is switched the selection analog channel by the level of control CHAN_SEL1 and two signal wires of CHAN_SEL2 under the low power operation pattern, the order of switching is A, B, C three-phase.The time that every phase channel status is kept is 20ms.
When analog channel was kept certain phase state, the current signal of this phase can become the input end that big or small in proportion voltage signal is transferred to signal amplification unit.As seen from Figure 2, signal amplification unit is made of a low consumed power operational amplifier U2, resistance R 19-R20, capacitor C 11-C12, is used for the in proportion negative feedback amplification of industrial frequency AC signal with input end.
As seen from Figure 2, the threshold value comparing unit is made of a low power consumption comparator U3, resistance R 21-R24, capacitor C 13-C14.C13 is with the isolation of the flip-flop of signal, and R21 and R22 setover signal, with anti-distortion, and then with voltage by R23 and R24 setting
Value compares, if the voltage threshold that the signal of being exported by signal amplification unit arranges greater than the threshold value comparing unit, the V_LOSS_OUT signal of threshold value comparing unit sends low level pulse.Otherwise V_LOSS_OUT keeps high level.
When host computer system determines the low level generation, just open computation chip and clock unit, record current value at this moment and the generation moment.And then enter dormant state.
Aspect Software for Design, utilize the clock unit of the super low-power consumption in the host computer system, after 60s woke host computer system to low power consumpting state up by dormant state, wakes up, software was directly carried out full decompression functional module.In this module, CPU is according to A, B, C three phase sequence opening signal channel selecting unit, and judges simultaneously corresponding V_LOSS_OUT(such as Fig. 2) I/O whether be low level.If low level, host computer system are opened computation chip and clock system, full decompression is recorded in the storage unit.Software flow as shown in Figure 3.
Claims (3)
1. the full decompression testing circuit of three-phase is characterized in that: comprise current sampling unit, current channel selected cell, signal amplification unit, threshold value comparing unit and host computer system; Wherein signal transfers to the current channel selected cell by current sampling unit, after transfer to signal amplification unit, transfer to again the threshold value comparing unit, the signal that obtains at last is transferred to host computer system.
2. the full decompression testing circuit of three-phase according to claim 1, it is characterized in that: the channel selecting unit is controlled by host computer system.
3. the full decompression testing circuit of three-phase according to claim 1 and 2, it is characterized in that: host computer system is with computation chip, and the current sampling unit output signal supplies the host computer system computation chip used simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220282370 CN202661540U (en) | 2012-06-15 | 2012-06-15 | Three-phase total-voltage-loss detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220282370 CN202661540U (en) | 2012-06-15 | 2012-06-15 | Three-phase total-voltage-loss detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202661540U true CN202661540U (en) | 2013-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220282370 Expired - Lifetime CN202661540U (en) | 2012-06-15 | 2012-06-15 | Three-phase total-voltage-loss detecting circuit |
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| Country | Link |
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| CN (1) | CN202661540U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983836A (en) * | 2014-04-29 | 2014-08-13 | 宁波三星电气股份有限公司 | Electric energy meter full voltage loss detection method |
| CN112557720A (en) * | 2020-11-12 | 2021-03-26 | 广西电网有限责任公司南宁供电局 | Emergency metering method for high-supply low-metering voltage phase-loss compensation electric quantity |
-
2012
- 2012-06-15 CN CN 201220282370 patent/CN202661540U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983836A (en) * | 2014-04-29 | 2014-08-13 | 宁波三星电气股份有限公司 | Electric energy meter full voltage loss detection method |
| CN112557720A (en) * | 2020-11-12 | 2021-03-26 | 广西电网有限责任公司南宁供电局 | Emergency metering method for high-supply low-metering voltage phase-loss compensation electric quantity |
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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 | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Qidong City, Suzhou City, Jiangsu province 226200 Lin Yang Lu No. 666 Patentee after: JIANGSU LINYANG ENERGY CO., LTD. Address before: Qidong City, Suzhou City, Jiangsu province 226200 Lin Yang Lu No. 666 Patentee before: Jiangsu Linyang Electronics Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130109 |