CN107192872A - A kind of external breaker of load current detection circuit and electric energy meter - Google Patents
A kind of external breaker of load current detection circuit and electric energy meter Download PDFInfo
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- CN107192872A CN107192872A CN201710546963.5A CN201710546963A CN107192872A CN 107192872 A CN107192872 A CN 107192872A CN 201710546963 A CN201710546963 A CN 201710546963A CN 107192872 A CN107192872 A CN 107192872A
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- load current
- resistance
- voltage
- amplification
- operational amplifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
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- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The present invention provides a kind of load current detection circuit and the external breaker of electric energy meter, including：Load current amplification module, including current diverter and voltage amplification module；The current diverter is used to obtain the load current for flowing through load, and the voltage signal that the voltage amplification module is used to produce the load current on the current diverter is amplified, and exports the amplification voltage corresponding with the load current；Load current comparison module, the size for comparing the amplification voltage and reference voltage, and using the comparative result of the amplification voltage and the reference voltage as load current and the comparative result of preset reference electric current, and export the comparative result.The external breaker of load current detection circuit and electric energy meter of the present invention remains able to meet the demand such as the urgent electricity consumption of user and illuminating lamp basic living electricity consumption under arrearage state, improves Consumer's Experience.
Description
Technical field
The present invention relates to the technical field of electronic circuit, more particularly to a kind of load current detection circuit and electric energy off-balancesheet
Put breaker.
Background technology
In the prior art, reliability is controlled in order to improve power information acquisition system expense, it is ensured that power system security is stable to be transported
OK, external breaker is generally set on electric energy meter.Wherein, the external breaker of electric energy meter is in all properties with breaker
Under the premise of, long-range arrearage separating brake and paying shutting-brake control can be realized by a control line.As shown in figure 1, working as electric energy meter
When judging arrearage, a separating brake control signal is sent to control module by control line, remote control open circuit is passed through with control module
Device unit carries out separating brake；When breaker unit is in gate-dividing state, if electric energy meter judges to pay, one is sent by control line
Energization control signal is to control module, to be closed a floodgate by control module remote control of circuit breaker unit.
If however, in subscriber arrearage, the direct separating brake of breaker unit is to cut off electricity consumption supply, it is impossible to meet user
The demand of the basic living electricity consumptions such as urgent electricity consumption and illumination, causes Consumer's Experience not good.
The content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of load current detection circuit and
The external breaker of electric energy meter, when electric energy meter judges arrearage, separating brake is judged whether to according to load current size is detected, with
The demand such as the urgent electricity consumption of user and illuminating lamp basic living electricity consumption is still met under arrearage state, so as to improve Consumer's Experience.
In order to achieve the above objects and other related objects, the present invention provides a kind of load current detection circuit, including：Load
Current amplifier module, including current diverter and voltage amplification module；The current diverter, which is used to obtain, flows through the negative of load
Electric current is carried, the voltage signal that the voltage amplification module is used to produce the load current on the current diverter is carried out
Amplification, exports the amplification voltage corresponding with the load current；Load current comparison module, for comparing the amplification voltage
With the size of reference voltage, and the comparative result of amplification voltage and the reference voltage is regard as load current and default ginseng
The comparative result of electric current is examined, and exports the comparative result.
In one embodiment of the invention, the current diverter and load in series are between zero line and zero line side.
In one embodiment of the invention, the current diverter uses manganese copper diverter.
In one embodiment of the invention, the voltage amplification module includes one-level amplification module and two grades of amplification modules；
The one-level amplification module includes first resistor, second resistance, 3rd resistor, the 4th resistance, the first electric capacity, second
Electric capacity and the first operational amplifier；One end of the first resistor is connected with the electric current outflow end of the current diverter, another
End is connected with the negative input end of first operational amplifier；One end of first electric capacity and first operational amplifier
Negative input end is connected, other end ground connection；One end of the 3rd resistor flows into end with the electric current of the current diverter and is connected, separately
One end is connected with the positive input terminal of first operational amplifier；One end of 4th resistance and first operational amplifier
Positive input terminal be connected, the other end ground connection；One end of second electric capacity and the positive input terminal phase of first operational amplifier
Even, other end ground connection；One end of the second resistance is connected with the negative input end of first operational amplifier, the other end and institute
The output end for stating the first operational amplifier is connected；
Two grades of amplification modules include the 5th resistance, the 6th resistance, the 7th resistance and the second operational amplifier；Described
One end of five resistance is connected with the output end of first operational amplifier, and the other end is just defeated with second operational amplifier
Enter end to be connected, one end ground connection of the 6th resistance, the other end is connected with the negative input end of second operational amplifier, described
One end of 7th resistance is connected with the negative input end of second operational amplifier, the other end and second operational amplifier
Output end is connected, and the voltage of the output end of second operational amplifier is the amplification voltage.
In one embodiment of the invention, load current amplification module also includes low-pass filtering module, the low pass filter
Input be connected with the output end of the voltage amplification module, output end output LPF after the amplification voltage.
In one embodiment of the invention, the low-pass filtering module includes the 8th resistance and the 3rd electric capacity；8th electricity
One end of resistance is connected with the output end of the voltage amplification module；The other end and the 3rd electric capacity and the low-pass filtering module
Output end be connected, the other end of the 3rd electric capacity ground connection.
In one embodiment of the invention, the load current comparison module includes reference voltage generation module and comparator；
The reference voltage generation module is used to generate reference voltage, and its output end is connected with the negative input end of the comparator, described
The output end of load current amplification module is connected with the positive input terminal of the comparator, and the output end output of the comparator is described
Comparative result.
In one embodiment of the invention, the reference voltage generation module includes the 9th resistance and the tenth resistance；Described
One end of nine resistance is connected with reference voltage, the other end as the reference voltage generation module output end；Tenth electricity
Resistance one end is connected with the output end of the reference voltage generation module, other end ground connection.
In one embodiment of the invention, according toTo set reference voltage Vj, the 9th electricity
Hinder R9 and the tenth resistance R10 value；Wherein, VcRepresent reference voltage, IcRepresent preset reference electric current；A represents that the voltage is put
The amplification coefficient of big module；RfRepresent the resistance of the current diverter.
Meanwhile, the present invention also provides a kind of electric energy meter external breaker, including any of the above-described described load current detection
Circuit, breaker unit and control module；
The control module is connected with electric energy meter, breaker unit and the load current detection circuit, for receiving
During the arrearage information sent to the electric energy meter, control the load current detection circuit obtain the amplification voltage with it is described
The comparative result of reference voltage, and when the comparative result is more than the reference voltage for the amplification voltage, control is described
Breaker unit separating brake.
As described above, the external breaker of load current detection circuit and electric energy meter of the present invention, has the advantages that：
(1) when electric energy meter judges arrearage, separating brake is judged whether to according to load current size is detected, with arrearage
The demand of the basic living electricity consumption such as the urgent electricity consumption of user and illumination is still met under state；
(2) cause the management of power use more hommization and scientific, improve Consumer's Experience.
Brief description of the drawings
Fig. 1 is shown as application schematic diagram of the external breaker of electric energy meter in the prior art in an embodiment；
Fig. 2 is shown as structural representation of the load current detection circuit of the present invention in an embodiment；
Fig. 3 is shown as structural representation of the load current amplifying circuit of the present invention in an embodiment；
Fig. 4 is shown as structural representation of the load current comparison circuit of the present invention in an embodiment；
Fig. 5 is shown as structural representation of the external breaker of electric energy meter of the present invention in an embodiment；
Fig. 6 is shown as application schematic diagram of the external breaker of electric energy meter of the present invention in an embodiment.
Component label instructions
1 load current detection circuit
11 load current amplification modules
111 current diverters
112 voltage amplification modules
1121 one-level amplification modules
1122 2 grades of amplification modules
113 low-pass filtering modules
12 load current comparison modules
121 reference voltage generation modules
122 comparators
2 breaker units
3 control modules
4 electric energy meters
Embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book understands other advantages and effect of the present invention easily.
It should be clear that structure, ratio, size depicted in this specification institute accompanying drawings etc., only to coordinate specification to be taken off
The content shown, so that those skilled in the art is understood with reading, is not limited to enforceable qualifications of the invention, therefore
Do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size are not influenceing the present invention
Under the effect that can be generated and the purpose that can reach, it all should still fall and obtain the model that can cover in disclosed technology contents
In enclosing.Meanwhile, the term of cited such as " on ", " under " in this specification, "left", "right", " centre " and " one " is also only
It is easy to understanding for narration, and is not used to limit enforceable scope of the invention, its relativeness is altered or modified, without essence
Change under technology contents, when being also considered as enforceable category of the invention.
The present invention the external breaker of load current detection circuit and electric energy meter by being loaded on current detecting,
, can be according to the size of current situation of user power utilization, it is determined whether separating brake in the case of arrearage.Specifically, when load current is less than
It is also non-shut-brake under arrearage state during predetermined current threshold, continue to provide urgent electricity consumption to user and illumination etc. is substantially raw
Apply flexibly electricity.When load current is more than predetermined current threshold, then separating brake is carried out.
As shown in Fig. 2 in an embodiment, load current detection circuit 1 of the invention includes load current amplification module
11 and load current comparison module 12.
Load current amplification module 11 includes current diverter 111 and the voltage amplification module 112 being connected.Wherein, electric current
Current divider 111 is used to obtain the load current for flowing through load, and voltage amplification module 112 is used for the load current in electric current point
The voltage signal produced on stream device 111 is amplified, and exports the amplification voltage corresponding with the load current.
As shown in figure 3, in an embodiment, in load current amplification module 11, current diverter 111 and load in series exist
Between zero line and zero line side, so as to obtain the load current for flowing through load.Due to the resistance very little of current diverter 111, therefore
Influence to load current can be neglected.Preferably, current splitters 111 use manganese copper diverter.
As shown in figure 3, voltage amplification module 112 includes one-level amplification module 1121 and two grades of amplification modules 1122.Pass through
Voltage signal on current diverter 111 is amplified twice, to obtain the amplification voltage corresponding with the load current.
Specifically, one-level amplification module 1121 includes first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance
R4, the first electric capacity C1, the second electric capacity C2 and the first operational amplifier U1A；First resistor R1 one end and current diverter 111
Electric current outflow end is connected, and the other end is connected with the first operational amplifier U1A negative input end；First electric capacity C1 one end and first
Operational amplifier U1A negative input end is connected, other end ground connection；3rd resistor R3 one end and the electric current of current diverter 111
Flow into end to be connected, the other end is connected with the first operational amplifier U1A positive input terminal；4th resistance R4 one end and the first computing
Amplifier U1A positive input terminal is connected, other end ground connection；Second electric capacity C2 one end is just defeated with the first operational amplifier U1A's
Enter end to be connected, other end ground connection；One end of R2 second resistances is connected with the first operational amplifier U1A negative input end, the other end
It is connected with the first operational amplifier U1A output end.Wherein, the first electric capacity C1 and the second electric capacity C2 is filter capacitor.
The magnitude of voltage at the two ends of setting electric current separator 111 is V0, then the one-level obtained by one-level amplification module 1121 is put
Big voltage V1=V0* (R2/R1).
Two grades of amplification modules 1122 include the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the second operational amplifier
U1B；5th resistance R5 one end is connected with the first operational amplifier U1A output end, the other end and the second operational amplifier U1B
Positive input terminal be connected, the 6th resistance R6 one end ground connection, the other end is connected with the second operational amplifier U1B negative input end,
7th resistance R7 one end is connected with the second operational amplifier U1B negative input end, the other end and the second operational amplifier U1B's
Output end is connected, and the voltage of the second operational amplifier U1B output end is the amplification voltage.
Specifically, the two grades of amplification voltages obtained by two grades of amplification modules 1122, i.e., described amplification voltage V2=V1*
(R7/R6)=V0* (R2/R1) * * (R7/R6)=V0*A.Wherein, A is the amplification system of voltage amplification module 112.
In one embodiment of the invention, load current amplification module 11 also includes low-pass filtering module 113, low pass filter
113 input is connected with the output end of voltage amplification module 112, the amplification voltage after output end output LPF.
As shown in figure 3, low-pass filtering module 113 includes the 8th resistance R8 and the 3rd electric capacity C3；8th resistance R8 one end
It is connected with the output end of voltage amplification module 112；The output end phase of the other end and the 3rd electric capacity C3 and low-pass filtering module 113
Even, the 3rd electric capacity C3 other end ground connection.In addition, being also associated with resistance between the driving voltage and output end of comparator 122
R11, to ensure the stability of circuit.
Load current comparison module 12 is connected with load current amplification module 11, for comparing the amplification voltage and reference
The size of voltage, and it regard the comparative result of the amplification voltage and the reference voltage as load current and preset reference electric current
Comparative result, and export the comparative result.
As shown in figure 4, load current comparison module 12 includes reference voltage generation module 121 and comparator 122 (U2A).
Reference voltage generation module 121 is used to generate reference voltage, its output end and the negative input end phase of comparator 122
Even, the output end of load current amplification module 11 is connected with the positive input terminal of comparator 122, the output end output of comparator 122
The comparative result.
In one embodiment of the invention, reference voltage generation module 121 includes the 9th resistance R9 and the tenth resistance R10；The
Nine resistance R9 one end and reference voltage (being 3.3V in the embodiment) are connected, other end generation module 121 as the reference voltage
Output end；Tenth resistance R10 one end is connected with the output end of reference voltage generation module 121, other end ground connection.
In the external breaker of electric energy meter of the present invention, determined by comparing the size of load current and preset reference electric current
Whether separating brake is carried out when determining arrearage.Because load current is corresponding with the amplification voltage, therefore need to change in preset reference electric current
For corresponding reference voltage, so as to according to the magnitude relationship of amplification voltage and reference voltage, determine load current and preset reference electricity
Magnitude relationship between stream, to determine whether the separating brake in arrearage.In this embodiment, according to
To set reference voltage Vj, the 9th resistance R9 and the tenth resistance R10 value；Wherein, VcRepresent reference voltage, IcRepresent default
Reference current；A represents the amplification coefficient of the voltage amplification module；RfRepresent the resistance of the current diverter.
Specifically, when amplifying branch pressure voltages of the voltage V2 more than R9 and R10, output I_Over is high level 1；Work as amplification
When voltage V2 is less than R9 and R10 branch pressure voltage, output I_Over is low level 0.
Therefore, it can be closed by above-mentioned load current detection circuit by amplifying the size between voltage and reference voltage
System, obtains the magnitude relationship between load current and preset reference electric current, i.e., described comparative result.
As shown in Figure 5 and Figure 6, in an embodiment, the external breaker of electric energy meter of the invention includes above-mentioned load current
Detect circuit 1, breaker unit 2 and control module 3.
Control module 3 is connected with electric energy meter 4, breaker unit 2 and load current detection circuit 1, for receiving electricity
During the arrearage information that energy table 4 is sent, control load current detection circuit 1 obtains the load current and preset reference electricity
The comparative result of stream, and when comparative result is that load current is more than preset reference electric current, control the separating brake of breaker unit 2.
Specifically, by I_Over signals input control module 3, it is acquired judgement.As I_Over=1, load is judged
Electric current is more than preset reference circuit, the control separating brake in arrearage of breaker unit 2 of control module 3.As I_Over=0, judge
Load current is less than given threshold, and the control breaker unit 2 of control module 3 is non-shut-brake in arrearage, so as to reach according to negative
Carry size of current and carry out arrearage separating brake control function.
Preferably, control module 3 uses CPU.In summary, load current detection circuit of the invention and electric energy meter are external
Breaker judges whether to separating brake, with arrearage state when electric energy meter judges arrearage according to load current size is detected
Under still meet the urgent electricity consumption of user and illumination etc. basic living electricity consumption demand；So that the management of power use more hommization and science
Change, improve Consumer's Experience.So, the present invention effectively overcomes various shortcoming of the prior art and has high industrial exploitation value
Value.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (10)
1. a kind of load current detection circuit, it is characterised in that：Including：
Load current amplification module, including current diverter and voltage amplification module；The current diverter is flowed through for acquisition
The load current of load, the voltage amplification module is used for the voltage for producing the load current on the current diverter
Signal is amplified, and exports the amplification voltage corresponding with the load current；
Load current comparison module, for compare it is described amplification voltage and reference voltage size, and by it is described amplification voltage with
The comparative result of the reference voltage and exports as the comparative result of load current and preset reference electric current and described compares knot
Really.
2. load current detection circuit according to claim 1, it is characterised in that：The current diverter and load in series
Between zero line and zero line side.
3. load current detection circuit according to claim 2, it is characterised in that：The current diverter is using copper-manganese point
Flow device.
4. load current detection circuit according to claim 1, it is characterised in that：The voltage amplification module includes one-level
Amplification module and two grades of amplification modules；
The one-level amplification module includes first resistor, second resistance, 3rd resistor, the 4th resistance, the first electric capacity, the second electric capacity
With the first operational amplifier；One end of the first resistor is connected with the electric current outflow end of the current diverter, the other end with
The negative input end of first operational amplifier is connected；One end of first electric capacity is negative defeated with first operational amplifier
Enter end to be connected, other end ground connection；One end of the 3rd resistor flows into end with the electric current of the current diverter and is connected, the other end
It is connected with the positive input terminal of first operational amplifier；One end of 4th resistance and first operational amplifier are just
Input is connected, other end ground connection；One end of second electric capacity is connected with the positive input terminal of first operational amplifier, separately
One end is grounded；One end of the second resistance is connected with the negative input end of first operational amplifier, the other end and described the
The output end of one operational amplifier is connected；
Two grades of amplification modules include the 5th resistance, the 6th resistance, the 7th resistance and the second operational amplifier；5th electricity
One end of resistance is connected with the output end of first operational amplifier, the positive input terminal of the other end and second operational amplifier
It is connected, one end ground connection of the 6th resistance, the other end is connected with the negative input end of second operational amplifier, the described 7th
One end of resistance is connected with the negative input end of second operational amplifier, the output of the other end and second operational amplifier
End is connected, and the voltage of the output end of second operational amplifier is the amplification voltage.
5. load current detection circuit according to claim 1, it is characterised in that：Load current amplification module also includes low
Pass filtering module, the input of the low pass filter is connected with the output end of the voltage amplification module, and output end output is low
The amplification voltage after pass filter.
6. load current detection electric current according to claim 5, it is characterised in that：The low-pass filtering module includes the 8th
Resistance and the 3rd electric capacity；One end of 8th resistance is connected with the output end of the voltage amplification module；The other end with it is described
3rd electric capacity is connected with the output end of the low-pass filtering module, the other end ground connection of the 3rd electric capacity.
7. load current detection circuit according to claim 1, it is characterised in that：The load current comparison module includes
Reference voltage generation module and comparator；The reference voltage generation module be used for generate reference voltage, its output end with it is described
The negative input end of comparator is connected, and the output end of the load current amplification module is connected with the positive input terminal of the comparator,
The output end of the comparator exports the comparative result.
8. load current detection circuit according to claim 7, it is characterised in that：The reference voltage generation module includes
9th resistance and the tenth resistance；One end of 9th resistance is connected with reference voltage, and the other end is given birth to as the reference voltage
Into the output end of module；Described tenth resistance one end is connected with the output end of the reference voltage generation module, other end ground connection.
9. load current detection circuit according to claim 8, it is characterised in that：According to
To set reference voltage Vj, the 9th resistance R9 and the tenth resistance R10 value；Wherein, VcRepresent reference voltage, IcRepresent default
Reference current；A represents the amplification coefficient of the voltage amplification module；RfRepresent the resistance of the current diverter.
10. a kind of external breaker of electric energy meter, it is characterised in that：Including the load current detection described in one of claim 1-9
Circuit, breaker unit and control module；
The control module is connected with electric energy meter, breaker unit and the load current detection circuit, for receiving
When stating the arrearage information that electric energy meter is sent, control the load current detection circuit to obtain the load current and preset with described
The comparative result of reference current, and when the comparative result is that the load current is more than the preset reference electric current, control
The breaker unit separating brake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710546963.5A CN107192872A (en) | 2017-07-06 | 2017-07-06 | A kind of external breaker of load current detection circuit and electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710546963.5A CN107192872A (en) | 2017-07-06 | 2017-07-06 | A kind of external breaker of load current detection circuit and electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107192872A true CN107192872A (en) | 2017-09-22 |
Family
ID=59881938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710546963.5A Pending CN107192872A (en) | 2017-07-06 | 2017-07-06 | A kind of external breaker of load current detection circuit and electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107192872A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108924A (en) * | 2019-05-30 | 2019-08-09 | 上海良信电器股份有限公司 | DC current measuring circuit, method and the breaker of breaker |
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| US5939991A (en) * | 1996-10-22 | 1999-08-17 | Eaton Corporation | Circuit breaker with current level indicator |
| CN2569396Y (en) * | 2002-08-08 | 2003-08-27 | 哈尔滨新中新电子股份有限公司 | Intelligent management device for power |
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