CN208459478U - A kind of antistatic electric energy meter circuit - Google Patents
A kind of antistatic electric energy meter circuit Download PDFInfo
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- CN208459478U CN208459478U CN201821016899.6U CN201821016899U CN208459478U CN 208459478 U CN208459478 U CN 208459478U CN 201821016899 U CN201821016899 U CN 201821016899U CN 208459478 U CN208459478 U CN 208459478U
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- antistatic
- electric energy
- energy meter
- diode
- meter circuit
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Abstract
The utility model relates to electric energy meter technical fields, more particularly to a kind of antistatic electric energy meter circuit, including sequentially connected light current terminal, signal processing unit, photoelectrical coupler and MCU, pass through two connecting line connections between the light current terminal and signal processing unit, it is equipped with antistatic diode between two connecting lines, and is more than or equal to Xmm with the distance between signal processing unit at the pad at the antistatic diode both ends.This antistatic circuit structure is simple and cost is relatively low.
Description
Technical field
The utility model relates to electric energy meter technical field more particularly to a kind of antistatic electric energy meter circuits.
Background technique
The light current terminal of traditional electric energy meter is divided into RS485, RS232, pulse, the signal terminals such as clock, and electric energy meter passes through this
A little signal terminals and external acquisition equipment or verifying attachment carry out data interaction.It is needed in laboratory or electricity consumption scene, operator
The signal terminal of electric energy meter and acquisition equipment or verifying attachment are attached by craft, and during the connection process, human body is taken
The electrostatic of band may generate damage to electric energy meter.Traditional electric energy meter light current terminal design is all made of photoelectrical coupler for forceful electric power
It is isolated with light current, but the spacing of photoelectrical coupler is not enough to be isolated the electrostatic of 8KV or more, if by increasing isolation distance
Method, antistatic effect, but its higher cost can be effectively improved, be affected to product overall dimensions, be not easy Batch Design
It uses.
Summary of the invention
A kind of simple the technical problem to be solved by the utility model is to provide structure and lower-cost antistatic electric energy
Watch circuit.
The technical scheme adopted by the utility model is a kind of antistatic electric energy meter circuit, including sequentially connected light current
Terminal, signal processing unit, photoelectrical coupler and MCU pass through two connecting lines between light current terminal and signal processing unit
Connection is equipped with antistatic diode between two connecting lines, and at the pad at antistatic diode both ends and signal processing unit
The distance between be more than or equal to Xmm.
Antistatic diode is Transient Suppression Diode.
Antistatic diode is zener diode.
The value range of X is 3-4.
X is 3.
It is connected between photoelectrical coupler and MCU by signal wire, and signal wire is equipped with a drop-down capacitor.
Pulling down the distance between capacitor and MCU is 1-2mm.
Pulling down the distance between capacitor and MCU is 2mm.
Using the above structure compared with prior art, the utility model has the advantage that by increasing antistatic two pole
Pipe can effectively weaken the interference signal of electrostatic in this way, and Transient Suppression Diode is arranged, weak so there is no need to consider
Positive and negative anodes relationship at electric terminal, suitability are relatively high；And by the pad of antistatic diode with signal processing unit it
Between distance be set greater than setting value, also can achieve in this way weaken interference signal effect；And photoelectricity is connected at the end MCU
Increase drop-down capacitor on the signal wire of coupler, is formed into a loop signal wire and the earth, plays the role of releasing, further weaken
Electrostatic interference signal.
Detailed description of the invention
Fig. 1 is the schematic diagram of the electric energy meter circuit of the prior art.
Fig. 2 is a kind of schematic diagram of antistatic electric energy meter circuit of the utility model.
Specific embodiment
The utility model is described further below in conjunction with attached drawing and specific embodiment, but the utility model is not only
It is limited to following specific embodiments.
As shown in Fig. 2, a kind of antistatic electric energy meter circuit, including sequentially connected light current terminal, signal processing unit, light
Electric coupler and MCU are wherein connected between light current terminal and signal processing unit by two connecting lines, and two connecting lines
Between be equipped with antistatic diode, and be greater than at the pad at antistatic diode both ends with the distance between signal processing unit
Equal to 3mm, it can prevent electrostatic from not first passing through antistatic diode and directly arriving signal processing unit in this way.
And antistatic diode uses Transient Suppression Diode, i.e. TVS diode in this specific embodiment, because this
Diode does not need to determine the positive and negative anodes distribution at light current terminal, can be with if understanding the positive and negative anodes distribution at light current terminal
Using zener diode.
Secondly, a drop-down capacitor can be arranged on signal wire between photoelectrical coupler and MCU, make signal wire and the earth
Forming circuit, electrostatic energy of releasing.
It is changed by these, electrostatic has substantially weakened before reaching photoelectrical coupler, and photoelectrical coupler both ends will not go out
Existing arcing, signal wire, which increases capacitor close to the position of MCU, to release interference signal, and the interference for finally reaching MCU will not be led
It causes to reset or crash.
And electric energy meter circuit further includes power circuit, and the prior art mostly uses greatly the higher resistance-capacitance depressurization of cost performance
Power supply (i.e. reinforced concrete structure), but since power grid environment is more complicated, there are more harmonic content, and electric energy meter directly with power grid phase
Even, the anti-harmonic wave ability of resistance-capacitance depressurization power supply is poor, directly influences the reliability of product.So the application connects in a power
One inductance forms RLC structure, and in this way under identical harmonic environment, safety capacitor capacitive reactance reduces, but increased inductance induction reactance
Increase with frequency and become larger, harmonic energy is more converted to quadergy, so that resistive voltage will not steeply rise, thus
High heat, which will not be generated, causes resistance to burn.It will not influence the power consumption of resistance-capacitance depressurization power supply entirety by this method and with load energy
Power, and the anti-harmonic wave ability of electric energy meter can be effectively improved, to improve the reliability of product.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, it will be understood by those of skill in the art that its according to
It can so modify to technical solution documented by previous embodiment, or part of technical characteristic is replaced on an equal basis
It changes；And these are modified or replaceed, and the essence of corresponding technical solution is not made to be detached from various embodiments of the utility model technical side
The spirit and scope of case.
Claims (7)
1. a kind of antistatic electric energy meter circuit, including sequentially connected light current terminal, signal processing unit, photoelectrical coupler and
MCU passes through two connecting line connections between the light current terminal and signal processing unit, it is characterised in that: two connections
Antistatic diode is equipped between line, and the distance between with signal processing unit at the pad at the antistatic diode both ends
More than or equal to Xmm；The value range of the X is 3-4.
2. a kind of antistatic electric energy meter circuit according to claim 1, it is characterised in that: the antistatic diode is wink
State inhibits diode.
3. a kind of antistatic electric energy meter circuit according to claim 1, it is characterised in that: the antistatic diode is steady
Press diode.
4. a kind of antistatic electric energy meter circuit according to claim 1, it is characterised in that: the X is 3.
5. a kind of antistatic electric energy meter circuit according to claim 1, it is characterised in that: the photoelectrical coupler and MCU
Between by signal wire connect, and the signal wire be equipped with a drop-down capacitor.
6. a kind of antistatic electric energy meter circuit according to claim 5, it is characterised in that: the drop-down capacitor and MCU it
Between distance be 1-2mm.
7. a kind of antistatic electric energy meter circuit according to claim 6, it is characterised in that: the drop-down capacitor and MCU it
Between distance be 2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821016899.6U CN208459478U (en) | 2018-06-29 | 2018-06-29 | A kind of antistatic electric energy meter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821016899.6U CN208459478U (en) | 2018-06-29 | 2018-06-29 | A kind of antistatic electric energy meter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208459478U true CN208459478U (en) | 2019-02-01 |
Family
ID=65169795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821016899.6U Active CN208459478U (en) | 2018-06-29 | 2018-06-29 | A kind of antistatic electric energy meter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208459478U (en) |
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2018
- 2018-06-29 CN CN201821016899.6U patent/CN208459478U/en active Active
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