CN208224358U - New-style electronic voltage sensor circuit and its electric energy meter - Google Patents
New-style electronic voltage sensor circuit and its electric energy meter Download PDFInfo
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- CN208224358U CN208224358U CN201820961272.1U CN201820961272U CN208224358U CN 208224358 U CN208224358 U CN 208224358U CN 201820961272 U CN201820961272 U CN 201820961272U CN 208224358 U CN208224358 U CN 208224358U
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Abstract
The utility model discloses a kind of new-style electronic voltage sensor circuits, including input protection circuit, signal amplification circuit, signal conversion circuit, voltage transformer, output protection circuit and the output sample circuit being sequentially connected in series；After route to be measured is protected by input protection circuit; amplified by signal amplification circuit; voltage signal is switched to current signal by signal conversion circuit to be isolated by voltage transformer, then is protected by output protection circuit, be converted to voltage signal finally by output sample circuit and is sampled for rear class.The invention also discloses the electric energy meters including the new-style electronic voltage sensor circuit.Not only circuit is simple and reliable for the utility model, but also low in cost, can be realized reliable isolation and load capacity is good.
Description
Technical field
The utility model is specifically related to a kind of new-style electronic voltage sensor circuit and its electric energy meter.
Background technique
With the development and the improvement of people's living standards of economic technology, electric energy has become in people's production and life
Essential secondary energy sources bring endless convenience to people's production and life.
Voltage sensor is widely used in the metering of electric system, for high-voltage signal to be converted to low pressure telecommunications
Number and for systematic sampling, thus assist complete electric energy metering.Currently, with the development of industry, voltage sensor is gradually small-sized
Change.Especially in recent years, it is electronic voltage transducer that voltage sensor, which gradually develops, and the electronic voltage transducer is using electricity
Resistance or capacitance partial pressure, become low-voltage analog signal for a high-voltage signal, and for systematic sampling.
Although electronic voltage transducer has the structure of transformer, primary and secondary equipment can be isolated,
It is the primary side of traditional electronic voltage transducer and secondary side or to be indirectly connected at present by resistance or capacitor etc., from
And in electronic voltage transducer failure, primary side electric energy is possible to be coupled to secondary side, to cause security risk.This
Outside, due to the miniaturization of electronic voltage transducer, so that its load capacity is weaker, simulation directly can not be carried out by system and adopted
Sample, to increase the difficulty of systematic sampling, and but also precision is relatively poor.
Utility model content
One of the purpose of this utility model is to provide that one kind can be realized reliable isolation and load capacity is preferably novel
Electronic voltage transducer circuit.
The two of the purpose of this utility model are that providing a kind of includes the new-style electronic voltage sensor circuit
Electric energy meter.
This new-style electronic voltage sensor circuit provided by the utility model, including input protection circuit, signal are put
Big circuit, signal conversion circuit, voltage transformer, output protection circuit and output sample circuit；Input protection circuit, signal are put
Big circuit, signal conversion circuit, voltage transformer, output protection circuit and output sample circuit are sequentially connected in series；Route to be measured is logical
It crosses after input protection circuit carries out input protection, signal amplification is carried out by signal amplification circuit, it is then electric by signal conversion
Voltage signal is converted to current signal and is isolated by voltage transformer by road, and the signal after isolation passes through output protection electricity
After road carries out second protection, then voltage signal is converted to by output sample circuit and is sampled for the A/D chip of rear class.
The new-style electronic voltage sensor circuit further includes output filter circuit；Output filter circuit is serially connected in letter
Number between amplifying circuit and signal conversion circuit, for being filtered to the signal that signal amplification circuit exports.
The output filter circuit is the RC low-pass filter circuit being made of resistance and capacitor.
The input protection circuit is lightning surge protection circuit.
The signal amplification circuit is the voltage follower circuit being made of operational amplifier.
The signal conversion circuit is the Voltage-current conversion circuit being made of resistance.
The output protection circuit is the output protection circuit being made of Zener diode.
The output sample circuit is the output sample circuit being made of sampling resistor.
The utility model additionally provides a kind of electric energy meter, and the electric energy meter includes the new-style electronic voltage sensor
Device circuit.
This new-style electronic voltage sensor circuit provided by the utility model, by lightning surge protection circuit to one
Secondary signal is protected, and the load capacity of circuit is improved using voltage follower, while realizing primary letter using voltage transformer
Isolation number between secondary singal；Therefore this circuit provided by the utility model, not only circuit is simple and reliable, but also cost
It is cheap, it can be realized reliable isolation and load capacity be good.
Detailed description of the invention
Fig. 1 is the functional block diagram of the utility model.
Fig. 2 is the circuit theory schematic diagram of the utility model.
Specific embodiment
It is as shown in Figure 1 the functional block diagram of the utility model: this new-style electronic voltage provided by the utility model
Sensor circuit, including input protection circuit, signal amplification circuit, output filter circuit, signal conversion circuit, mutual induction of voltage
Device, output protection circuit and output sample circuit；Input protection circuit, signal amplification circuit, output filter circuit, signal conversion
Circuit, voltage transformer, output protection circuit and output sample circuit are sequentially connected in series；Route to be measured by input protection circuit into
After row input protection, signal amplification is carried out by signal amplification circuit, is then filtered and exports by output filter circuit
Filtered voltage signal, signal conversion circuit by voltage signal be converted to current signal and by voltage transformer carry out every
From after signal after isolation carries out second protection by output protection circuit, then being converted to voltage by exporting sample circuit and believe
Number and sampled for the A/D chip of rear class.
In the specific implementation, input protection circuit can use lightning surge protection circuit；Output filter circuit can be adopted
With the RC low-pass filter circuit being made of resistance and capacitor；Signal amplification circuit can be using the voltage being made of operational amplifier
Follower circuit；Signal conversion circuit can be using the Voltage-current conversion circuit being made of resistance；Output protection circuit can be adopted
With the output protection circuit being made of Zener diode；Output sample circuit can be using the output sampling being made of sampling resistor
Circuit.
It is illustrated in figure 2 the circuit theory schematic diagram of the utility model: it can be seen from the figure that input protection circuit includes
Varistor RV4, resistance R105, R111 and TVS pipe Z6 are constituted；Signal amplification circuit then includes amplifier chip U15, amplifier input
Resistance R106 and amplifier biasing resistor R103；Output filter circuit is then made of resistance R107 and capacitor C109；Signal conversion electricity
Road is then made of resistance R108；Voltage transformer constitutes voltage transformer by model SPT204AD and constitutes；Output protection circuit
The Zener diode V7 and V8 concatenated including two；Exporting sample circuit includes resistance R109 and R238；The output of least significant end is filtered
The RC low-pass filter circuit (resistance R104 and C108, resistance R112 and C110) that wave circuit then uses.
In figure, U0+ connects power line to be sampled with U0-, and the high-voltage signal of input passes through pressure-sensitive RV4 (parameter 14K510)
After protection, circuit rear class residual voltage is about 1000V, then again by wire-wound resistor R105, R111 and TVS pipe Z6 by voltage clamping about
To 6V, which completes front end analogue signal protection；Then signal amplifier U15, resistance R106 and R103 by being made of
Voltage follower amplify (be enlarged into load capacity amplification), the distinguishing feature of voltage follower is exactly that input impedance is high,
And output impedance is low.Signal enters the follower of U15 composition, the amplifier OP07 input impedance (bias current 4nA) that we select
It is very big, it can satisfy the carrying load ability of electronic voltage transducer.R103 is the biased electrical for offsetting two input terminals of amplifier
It interacts caused by stream.Output signal outputs signal to signal conversion circuit after R107 and C109 low-pass filtering.
Voltage signal is become suitable current signal by R108, voltage supplied mutual inductor T6 work in suitable range.Voltage transformer
T6 is that parameter is 2mA:2mA, and T6 rear class carries out voltage clamp by protection circuit (V7 and V8 are constituted), then passes through sampling electricity again
Hinder R109 and R238, current signal is converted into voltage signal, finally by output low pass R/C filters (resistance R104 and
C108, resistance R112 and C110) for A/D chip sampling processing.
This new-style electronic voltage sensor circuit provided by the present application can be used for other any need progress voltages and adopt
The electronic equipment of sample, it is whole including all types of measuring instruments (such as electric energy meter, water meter, gas meter, flow meter, calorimeter etc.), electric energy management
End, distribution terminal, electric energy quality monitoring equipment, grid automation terminal, acquisition terminal, concentrator, data collector, gauge
Table, write by hand device, fault detector etc..
Claims (9)
1. a kind of new-style electronic voltage sensor circuit, it is characterised in that including input protection circuit, signal amplification circuit, letter
Number conversion circuit, voltage transformer, output protection circuit and output sample circuit；Input protection circuit, signal amplification circuit, letter
Number conversion circuit, voltage transformer, output protection circuit and output sample circuit are sequentially connected in series；Route to be measured passes through input protection
After circuit carries out input protection, signal amplification is carried out by signal amplification circuit, is then believed voltage by signal conversion circuit
It number is converted to current signal and is isolated by voltage transformer, the signal after isolation is carried out secondary by output protection circuit
After protection, then voltage signal is converted to by output sample circuit and is sampled for the A/D chip of rear class.
2. new-style electronic voltage sensor circuit according to claim 1, it is characterised in that further include output filtered electrical
Road；Output filter circuit is serially connected between signal amplification circuit and signal conversion circuit, for what is exported to signal amplification circuit
Signal is filtered.
3. new-style electronic voltage sensor circuit according to claim 2, it is characterised in that the output filtered electrical
Road is the RC low-pass filter circuit being made of resistance and capacitor.
4. new-style electronic voltage sensor circuit described according to claim 1~one of 3, it is characterised in that the input
Protection circuit is lightning surge protection circuit.
5. new-style electronic voltage sensor circuit described according to claim 1~one of 3, it is characterised in that the signal
Amplifying circuit is the voltage follower circuit being made of operational amplifier.
6. new-style electronic voltage sensor circuit described according to claim 1~one of 3, it is characterised in that the signal
Conversion circuit is the Voltage-current conversion circuit being made of resistance.
7. new-style electronic voltage sensor circuit described according to claim 1~one of 3, it is characterised in that the output
Protecting circuit is the output protection circuit being made of Zener diode.
8. new-style electronic voltage sensor circuit described according to claim 1~one of 3, it is characterised in that the output
Sample circuit is the output sample circuit being made of sampling resistor.
9. a kind of electric energy meter, it is characterised in that including right to go one of 1~8 described in new-style electronic voltage sensor electricity
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820961272.1U CN208224358U (en) | 2018-06-21 | 2018-06-21 | New-style electronic voltage sensor circuit and its electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820961272.1U CN208224358U (en) | 2018-06-21 | 2018-06-21 | New-style electronic voltage sensor circuit and its electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208224358U true CN208224358U (en) | 2018-12-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820961272.1U Active CN208224358U (en) | 2018-06-21 | 2018-06-21 | New-style electronic voltage sensor circuit and its electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208224358U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490253A (en) * | 2018-06-21 | 2018-09-04 | 威胜电气有限公司 | New-style electronic voltage sensor circuit, detection method and its electric energy meter |
-
2018
- 2018-06-21 CN CN201820961272.1U patent/CN208224358U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490253A (en) * | 2018-06-21 | 2018-09-04 | 威胜电气有限公司 | New-style electronic voltage sensor circuit, detection method and its electric energy meter |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 411201 28 Bai Shi Road, Jing Kai District, Xiangtan, Hunan Patentee after: Weisheng Energy Technology Co.,Ltd. Address before: 411201 28 Bai Shi Road, Jing Kai District, Xiangtan, Hunan Patentee before: WASION ELECTRIC Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |