CN205749642U - A kind of chopper intelligent electrical apparatus release current sampling circuit - Google Patents
A kind of chopper intelligent electrical apparatus release current sampling circuit Download PDFInfo
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- CN205749642U CN205749642U CN201620371123.0U CN201620371123U CN205749642U CN 205749642 U CN205749642 U CN 205749642U CN 201620371123 U CN201620371123 U CN 201620371123U CN 205749642 U CN205749642 U CN 205749642U
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Abstract
nullThe open a kind of chopper intelligent electrical apparatus release current sampling circuit of this utility model，Including the first operational amplifier and the second operational amplifier，It is sequentially connected in series the first Zener diode between the first input end and circuit input end of the first operational amplifier and the 4th resistance，The second Zener diode being sequentially connected in series between the second input and the circuit input end of the first operational amplifier and the 3rd resistance，It is connected to first resistance connected between node and reference voltage output end of the first Zener diode and the 4th resistance，It is connected to second resistance connected between node and reference voltage output end of the second Zener diode and the 3rd resistance，The 6th resistance being connected between the first operational amplifier and reference voltage output end，The 7th resistance being connected between the first input end of the first operational amplifier and the outfan of the first operational amplifier，It is connected to the 9th resistance of the first operational amplifier and first order circuit output end.This utility model provides the High-frequency Interference being prevented from circuit, makes the signal voltage of output not fluctuate because of interference.
Description
Technical field
This utility model belongs to low-voltage circuit breaker field, is more particularly to a kind of intelligent electrical apparatus release current sampling circuit.
Background technology
Either the every field of industrial and agricultural development, national defense construction, or people's lives all be unable to do without electricity.Electricity produce,
During conveying, use, distribution is an extremely important link.In low-voltage distribution system, chopper plays control and protects
Protect dual function, splitting or integrating lock or the operation cycle task of regulation can be completed under having load, no-load and various failure condition.Open circuit
Cut-offfing of device wants quick, reliable, stable.Along with China's economic development and the growth of power industry demand, to distribution line with set
Standby safe and reliable property requires more and more higher；And along with electronic communication, computer technology, automatic control technology, people
The development of work intellectual technology；Make chopper towards modularity and modularization, electronization and intellectuality, reliability and the feature of environmental protection etc.
Direction develop.
Intelligent electrical apparatus release is the core component of intelligent breaker, intelligent electrical apparatus release can steady operation, capacity of resisting disturbance is strong,
Can run by normal table under there is the interference such as power-supply fluctuation, high/low temperature, electromagnetic radiation, thunderbolt weather, make the signal of output
Voltage does not fluctuates because of interference, it is ensured that the precision of signals collecting.
At present, both at home and abroad in some electrical apparatus release products, electrical apparatus release voltage collection circuit uses one-level discharge circuit, this kind of electricity
Road is it cannot be guaranteed that measure the signal acquisition precision when rated value, it may appear that bigger error, and can not well prevent electricity
High-frequency Interference in road, makes the signal voltage of output fluctuate because of interference, it is impossible to ensureing the precision gathered, What is more can produce
Misoperation, can affect the Quality of experience of owner, affects the normal use of product.
Utility model content
In order to solve above-mentioned technical problem, this utility model provides a kind of amplification that can conveniently regulate two-stage, and
And the High-frequency Interference being prevented from circuit, make the signal voltage of output not fluctuate because of interference, it is ensured that the open circuit of acquisition precision
Device intelligent electrical apparatus release current sampling circuit.
The technical solution of the utility model is as follows:
A kind of chopper intelligent electrical apparatus release current sampling circuit, including:
First operational amplifier and the second operational amplifier,
It is sequentially connected in series the first Zener diode between the first input end and circuit input end of the first operational amplifier
With the 4th resistance,
The second Zener diode being sequentially connected in series between the second input and the circuit input end of the first operational amplifier
With the 3rd resistance,
It is connected to the connect between node and reference voltage output end first electricity of the first Zener diode and the 4th resistance
Resistance,
It is connected to the connect between node and reference voltage output end second electricity of the second Zener diode and the 3rd resistance
Resistance,
The 6th resistance being connected between the first operational amplifier and reference voltage output end,
The 7th electricity being connected between the first input end of the first operational amplifier and the outfan of the first operational amplifier
Resistance,
It is connected to the 9th resistance of the first operational amplifier and first order circuit output end,
The 8th electricity being connected between the outfan of the first operational amplifier and the second input of the second operational amplifier
Resistance,
It is connected to the 11st resistance between first input end and the reference voltage output end of the second operational amplifier,
It is connected to the 5th resistance between first input end and the outfan of the second operational amplifier,
The tenth resistance being connected between the outfan of the second operational amplifier and second level circuit output end,
In some embodiments, also include:
It is connected to the first precision capacitance between the second input and the earth terminal of the first operational amplifier,
It is connected to the 4th electric capacity between first input end and the earth terminal of the first operational amplifier,
It is connected to the second precision capacitance between the second input and the earth terminal of the second operational amplifier,
It is connected to the 5th electric capacity between first input end and the earth terminal of the second operational amplifier,
It is connected to the 7th electric capacity connected between node and earth terminal of the 9th resistance of first order circuit output end,
It is connected to the 8th electric capacity connected between node and earth terminal of second level circuit output end and the tenth resistance.
In some embodiments, also include:
Be connected to the first Zener diode and the 4th resistance connects node and the second Zener diode and the 3rd resistance
Connect the first electric capacity between node,
The second electric capacity being connected between the first input end of the first operational amplifier and the second input,
The 3rd electric capacity being connected between the first input end of the second operational amplifier and the second input,
The 6th electricity being connected between the first input end of the first operational amplifier and the outfan of the first operational amplifier
Hold.
In some embodiments, the first input end of described first operational amplifier is negative-phase input, described first
Second input of operational amplifier is normal phase input end.
In some embodiments, the first input end of described second operational amplifier is negative-phase input, described second
Second input of operational amplifier is normal phase input end.
In some embodiments, described circuit input end summation current transformer connects.
It has the beneficial effect that the first Zener diode and the second Zener diode play the effect of clamp voltage, will input
Voltage signal clamper within 11V, it is ensured that the steady operation of subsequent conditioning circuit；First resistance plays the effect of pull-up, anti-anti-avulsion
Major loop is impacted by button circuit, plays the effect of protection major loop；This utility model chopper intelligent electrical apparatus release electric current
Sample circuit can run by normal table under having the interference such as power-supply fluctuation, high/low temperature, electromagnetic radiation, thunderbolt weather, makes defeated
The voltage signal gone out produces fluctuation without interruption, it is ensured that the precision of sampling, and this circuit can regulate two step voltages easily
Amplification.
Accompanying drawing explanation
Fig. 1 is the circuit signal of the chopper intelligent electrical apparatus release current sampling circuit of this utility model one embodiment
Figure.
Detailed description of the invention
As it is shown in figure 1, the open a kind of chopper intelligent electrical apparatus release power supply sample circuit of this utility model, including the first fortune
Calculate amplifier A1 and the second operational amplifier A 2.It is sequentially connected in series the first input end in the first operational amplifier A 1 and circuit input
The first Zener diode Z1 between end and the 4th resistance R4.Be sequentially connected in series in the first operational amplifier A 1 the second input and
The second Zener diode Z2 between circuit input end and the 3rd resistance R3.It is connected to the first Zener diode Z1 and the 4th resistance
The first resistance R1 connected between node and reference voltage output end VREF of R4.It is connected to the second Zener diode Z2 and the 3rd
The second resistance R2 connected between node and reference voltage output end VREF of resistance R3.It is connected to the first operational amplifier A 1 He
The 6th resistance R6 between reference voltage output end VREF.It is connected to first input end and first fortune of the first operational amplifier A 1
Calculate the 7th resistance R7 between the outfan of amplifier A1.It is connected to the first operational amplifier A 1 and first order circuit output end
The 9th resistance R9 of ADIAH.It is connected to the outfan of the first operational amplifier A 1 and the second input of the second operational amplifier A 2
The 8th resistance R8 between end.It is connected between first input end and the reference voltage output end VREF of the second operational amplifier A 2
The 11st resistance R11.It is connected to the 5th resistance R5 between first input end and the outfan of the second operational amplifier A 2.Even
It is connected to the tenth resistance R10 between the outfan of the second operational amplifier A 2 and second level circuit output end ADIAL.
In the present embodiment, chopper intelligent electrical apparatus release current sampling circuit also includes being connected to the first operation amplifier
The first precision capacitance CB1 between second input and the earth terminal GND of device A1.It is connected to the first of the first operational amplifier A 1
The 4th electric capacity C4 between input and earth terminal GND.It is connected to the second input and the earth terminal of the second operational amplifier A 2
The second precision capacitance CB2 between GND.It is connected between first input end and the earth terminal GND of the second operational amplifier A 2
5th electric capacity C5, between connection node and the earth terminal GND of the 9th resistance R9 being connected to first order circuit output end ADIAH
7th electric capacity C7.It is connected between second level circuit output end ADIAL and the connection node of the tenth resistance R10 and earth terminal GND
The 8th electric capacity R8.
Chopper intelligent electrical apparatus release current sampling circuit also includes being connected to the first Zener diode Z1 and the 4th resistance
The first electric capacity C1 connected between node connecting node and the second Zener diode Z2 and the 3rd resistance R3 of R4.It is connected to
The second electric capacity C2 between first input end and second input of one operational amplifier A 1.It is connected to the second operational amplifier A 2
First input end and the second input between the 3rd electric capacity C3, be connected to the first operational amplifier A 1 first input end and
The 6th electric capacity C6 between the outfan of the first operational amplifier A 1.
The first input end of the first operational amplifier A 1 is negative-phase input, the second input of the first operational amplifier A 1
For normal phase input end.The first input end of the second operational amplifier A 2 is negative-phase input, the second of the second operational amplifier A 2
Input is normal phase input end.
Circuit input end summation current transformer connects.
Current signal is converted into voltage signal by connecing current transformer by chopper, collects voltage, it is possible to conversion
Become corresponding electric current.The voltage range of the voltage signal IAH-IAL of current transformer input is between-11V to+11V, and precision is wanted
Ask within 5%.Prevent input voltage to be higher than 11V and add the first Zener diode Z1 and the second Zener diode at the input of circuit
End Z2.Chopper is when rated value, and the voltage range of IAH-IAL is-200mV between+200mV, and precision is higher, 1% with
In.Because CPU is typically merely able to adopt the voltage within 3V, for ensure CPU can normal acquisition ensure required precision, first have to
The voltage range of-11V to+11V is amplified being adjusted to the voltage range of 0-3V, then is amplified signal arriving-200mV
The voltage range of+200mV is adjusted to the voltage range of 0-3V.First pass through by the first resistance R1, the second resistance R2, the 3rd resistance
R3, the 4th resistance R4, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the first electric capacity C1, the second electric capacity
C2, the 4th electric capacity C4, the 6th electric capacity C6, the 7th electric capacity C7, the first precision capacitance CB1, the electricity of the first operational amplifier A 1 composition
Pressure amplifying circuit, exports to first order circuit output end ADIAH through the 9th resistance R9, and this voltage amplification factor is adjusted to 0.1364
Times, the voltage range of-11V to+11V is adjusted to-1.5V and arrives the voltage range of+1.5V, then by the highest for voltage 1.5V, adjust to
The scope of 0-3V；Wherein, the first electric capacity C1, the second electric capacity C2, the 4th electric capacity C4, the 6th electric capacity C6, the 7th electric capacity C7, the first essence
Cipher telegram holds CB1 and plays the effect of filtering, and the 3rd resistance R3, the 4th resistance R4, the 6th resistance R6, the 7th resistance R7 adjust times magnification
Number, first order output voltage is:
When choosing resistance, taking R4=R3, R7=R6, above formula becomes:
Only need to adjust the 4th resistance R4, amplification is adjusted to the value that requires by the 6th resistance R6.
Again by UADIAHVia the 3rd electric capacity C3, the 5th electric capacity C5, the 8th electric capacity C8, the second precision capacitance CB2, the 5th resistance
Signal is put by R5, the tenth resistance R10, the 11st resistance R11, the voltage amplifier circuit of the second operational amplifier A 2 composition
Greatly, this amplification is 55 times, owing to operational amplifier 3V voltage reaches saturated, when amplifying 55 times, just-200mV can be arrived+
The voltage range of 200mV is adjusted to the voltage range of 0-3V, wherein the 3rd electric capacity C3, the 5th electric capacity C5, the 8th electric capacity C8, second
Precision capacitance CB2 is filter capacitor, and the 5th resistance R5, the 11st resistance R11 adjust amplification, and second level output voltage is:
Adjust the 5th resistance R5, the 11st resistance R11 amplification is adjusted to require value.
From principles above, if we reasonably regulation the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the
11 resistance R11 resistance values, can be achieved with the output voltage that we require, and ensure required precision.
Above-described be only this utility model a kind of chopper intelligent electrical apparatus release current sampling circuit some implement
Mode, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to makes some deformation
And improvement, these broadly fall into protection domain of the present utility model.
Claims (6)
1. a chopper intelligent electrical apparatus release current sampling circuit, it is characterised in that include
First operational amplifier (A1) and the second operational amplifier (A2),
It is sequentially connected in series the first Zener diode between first input end and the circuit input end of the first operational amplifier (A1)
(Z1) and the 4th resistance (R4),
It is sequentially connected in series the second Zener diode between the second input and the circuit input end of the first operational amplifier (A1)
(Z2) and the 3rd resistance (R3),
Be connected to the first Zener diode (Z1) and the connection node of the 4th resistance (R4) and reference voltage output end (VREF) it
Between the first resistance (R1),
Be connected to the second Zener diode (Z2) and the connection node of the 3rd resistance (R3) and reference voltage output end (VREF) it
Between the second resistance (R2),
The 6th resistance (R6) being connected between the first operational amplifier (A1) and reference voltage output end (VREF),
Be connected between the first input end of the first operational amplifier (A1) and the outfan of the first operational amplifier (A1)
Seven resistance (R7),
It is connected to the 9th resistance (R9) of the first operational amplifier (A1) and first order circuit output end (ADIAH),
Be connected between the outfan of the first operational amplifier (A1) and the second input of the second operational amplifier (A2)
Eight resistance (R8),
The 11st electricity being connected between the first input end of the second operational amplifier (A2) and reference voltage output end (VREF)
Resistance (R11),
The 5th resistance (R5) being connected between first input end and the outfan of the second operational amplifier (A2),
It is connected to the tenth resistance between the outfan of the second operational amplifier (A2) and second level circuit output end (ADIAL)
(R10)。
Chopper intelligent electrical apparatus release current sampling circuit the most according to claim 1, it is characterised in that also include:
The first precision capacitance (CB1) being connected between the second input of the first operational amplifier (A1) and earth terminal (GND),
The 4th electric capacity (C4) being connected between the first input end of the first operational amplifier (A1) and earth terminal (GND),
It is connected to the second precision capacitance between the second input of the second operational amplifier (A2) and earth terminal (GND)
(CB2),
The 5th electric capacity (C5) being connected between the first input end of the second operational amplifier (A2) and earth terminal (GND),
Between connection node and the earth terminal (GND) of the 9th resistance (R9) being connected to first order circuit output end (ADIAH)
7th electric capacity (C7),
Be connected between second level circuit output end (ADIAL) and the connection node of the tenth resistance (R10) and earth terminal (GND)
Eight electric capacity (C8).
Chopper intelligent electrical apparatus release current sampling circuit the most according to claim 1, it is characterised in that also include:
It is connected to the first Zener diode (Z1) and the connection node of the 4th resistance (R4) and the second Zener diode (Z2) and
First electric capacity (C1) connected between node of three resistance (R3),
It is connected to the second electric capacity (C2) between first input end and second input of the first operational amplifier (A1),
It is connected to the 3rd electric capacity (C3) between first input end and second input of the second operational amplifier (A2),
Be connected between the first input end of the first operational amplifier (A1) and the outfan of the first operational amplifier (A1)
Six electric capacity (C6).
Chopper intelligent electrical apparatus release current sampling circuit the most according to claim 1, it is characterised in that described first fortune
The first input end calculating amplifier (A1) is negative-phase input, and the second input of described first operational amplifier (A1) is positive
Input.
Chopper intelligent electrical apparatus release current sampling circuit the most according to claim 1, it is characterised in that described second fortune
The first input end calculating amplifier (A2) is negative-phase input, and the second input of described second operational amplifier (A2) is positive
Input.
Chopper intelligent electrical apparatus release current sampling circuit the most according to claim 1, it is characterised in that described circuit is defeated
Enter and hold summation current transformer to connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620371123.0U CN205749642U (en) | 2016-04-28 | 2016-04-28 | A kind of chopper intelligent electrical apparatus release current sampling circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620371123.0U CN205749642U (en) | 2016-04-28 | 2016-04-28 | A kind of chopper intelligent electrical apparatus release current sampling circuit |
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|---|---|
| CN205749642U true CN205749642U (en) | 2016-11-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271763A (en) * | 2017-06-20 | 2017-10-20 | 常熟开关制造有限公司(原常熟开关厂） | Current sampling circuit, electronic trip unit, breaker |
| CN113809913A (en) * | 2021-08-13 | 2021-12-17 | 广州金升阳科技有限公司 | Constant voltage control circuit |
-
2016
- 2016-04-28 CN CN201620371123.0U patent/CN205749642U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271763A (en) * | 2017-06-20 | 2017-10-20 | 常熟开关制造有限公司(原常熟开关厂） | Current sampling circuit, electronic trip unit, breaker |
| CN107271763B (en) * | 2017-06-20 | 2019-07-23 | 常熟开关制造有限公司(原常熟开关厂） | Current sampling circuit, electronic trip unit, breaker |
| CN113809913A (en) * | 2021-08-13 | 2021-12-17 | 广州金升阳科技有限公司 | Constant voltage control circuit |
| CN113809913B (en) * | 2021-08-13 | 2023-12-12 | 广州金升阳科技有限公司 | Constant voltage control circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |