CN207181503U - A kind of voltage sampling circuit of high voltage transducer power unit - Google Patents

A kind of voltage sampling circuit of high voltage transducer power unit Download PDF

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Publication number
CN207181503U
CN207181503U CN201720711770.6U CN201720711770U CN207181503U CN 207181503 U CN207181503 U CN 207181503U CN 201720711770 U CN201720711770 U CN 201720711770U CN 207181503 U CN207181503 U CN 207181503U
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circuit
voltage
operational amplifying
build
difference operational
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CN201720711770.6U
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李守法
仲华
杨文刚
杨军亮
齐亮
陈江洪
王旭
黄艳
李雪利
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Shanghai Electric Fuji Electric Power Technology Co Ltd
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Shanghai Electric Fuji Electric Power Technology Co Ltd
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Abstract

The utility model provides a kind of voltage sampling circuit of high voltage transducer power unit, wherein, including：Three phase mains incoming end；First reduction voltage circuit, each phase of three phase mains incoming end connect one first reduction voltage circuit respectively；The neutral conductor, it is connected with each first reduction voltage circuit；First difference operational amplifying circuit, the output end of each first reduction voltage circuit connect one first difference operational amplifying circuit respectively；First signal processing circuit, the output end of each first difference operational amplifying circuit connect one first signal processing circuit respectively；Each first signal processing circuit exports the voltage of a corresponding phase respectively.The beneficial effect of its technical scheme is that the voltage detecting mode in the prior art that overcomes has the problem of cost is high, space-consuming is big or sampling precision is not high.

Description

A kind of voltage sampling circuit of high voltage transducer power unit
Technical field
It the utility model is related to high voltage converter field, more particularly to a kind of voltage sample of high voltage transducer power unit Circuit.
Background technology
High voltage transducer power unit is to carry out rectification, filtering, the high-pressure frequency-conversion of inversion using power power electronic device Device part.Power cell would generally consider overvoltage, under-voltage protection, therefore input voltage, DC bus-bar voltage in design Accurate measurement is particularly important to the reliability service of power cell.
The existing metering system used in high voltage transducer power unit voltage measurement includes, voltage isolation, it is non-every From two kinds.Wherein isolation method mainly uses voltage Hall, PT or linear optical coupling, and this mode has cost height, space-consuming The problem of big or sampling precision is not high.Rather than isolation method mainly uses electric resistance partial pressure mode, which is easily achieved, cost compared with It is low；But antijamming capability is weaker.
In power electronics wide variety of today, in face of the market competition of fierceness, need badly a kind of high reliability, low cost and The voltage sampling circuit of the high voltage transducer power unit of miniaturization.
The content of the invention
For the above mentioned problem present in high voltage transducer power unit voltage measurement in the prior art, now provide a kind of It is easily achieved, is compact-sized, there is the voltage of the high high voltage transducer power unit of low cost, strong antijamming capability, reliability Sample circuit.
Concrete technical scheme is as follows：
A kind of voltage sampling circuit of high voltage transducer power unit, wherein, including：
Three phase mains incoming end；
First reduction voltage circuit, each phase of the three phase mains incoming end connect first reduction voltage circuit respectively；
The neutral conductor, it is connected with each first reduction voltage circuit；First difference operational amplifying circuit, each first decompression electricity The output end on road connects first difference operational amplifying circuit respectively；
First signal processing circuit, the output end of each first difference operational amplifying circuit connect first letter respectively Number process circuit；
Each first signal processing circuit exports the voltage of a corresponding phase respectively.
Preferably, in addition to a two-phase power access end；
Second reduction voltage circuit, it is connected with the two-phase power supply incoming end；
Second difference operational amplifying circuit, it is connected with the output end of second reduction voltage circuit；
Secondary signal process circuit, it is connected with the output end of second difference operational amplifying circuit；
The secondary signal processing unit is exporting the voltage difference between the two-phase of two-phase power supply incoming end output.
Preferably, first difference operational amplifying circuit includes：
First amplifier；
First filter capacitor, it is connected to the both ends of the output of first reduction voltage circuit；
First build-out resistor, with connecing power supply；
Second build-out resistor, one end of second build-out resistor are connected with the negative input of first amplifier, The other end is connected with the output end of first amplifier.
Preferably, each first reduction voltage circuit includes：
One first resistor, connected with first build-out resistor；
One second resistance, connected with second build-out resistor.
Preferably, second difference operational amplifying circuit includes：
Second amplifier；
Second filter capacitor, it is connected to the both ends of the output of second reduction voltage circuit；
3rd build-out resistor, with connecing power supply；
4th build-out resistor, one end of second build-out resistor are connected with the negative input of second amplifier, The other end is connected with the output end of second amplifier.
Preferably, each first reduction voltage circuit includes：
One second resistance, connected with the 3rd build-out resistor；
One 3rd resistor, connected with the 4th build-out resistor.
Preferably, first signal processing circuit includes：
First operating resistance, it is connected with the output end of first difference operational amplifying circuit；
3rd amplifier, it is connected with first operating resistance；
3rd filter capacitor, with connecing power supply.
Preferably, the secondary signal process circuit includes：
Second operating resistance, it is connected with the output end of first difference operational amplifying circuit；
4th amplifier, it is connected with first operating resistance；
4th filter capacitor, with connecing power supply.
Above-mentioned technical proposal has the following advantages that or beneficial effect：It is compact-sized, have cost is low, strong antijamming capability, Reliability is high, is easily achieved the voltage sample of power cell, reduces board size, overcomes voltage detecting side in the prior art The problem of cost is high, space-consuming is big or sampling precision is not high be present in formula.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the embodiment of the voltage sampling circuit of high voltage transducer power unit of the utility model Figure.
Reference represents：
1st, three phase mains incoming end；11st, the first reduction voltage circuit；12nd, the first difference operational amplifying circuit；13rd, the first signal transacting Circuit；
2nd, two-phase power supply incoming end；21st, the second reduction voltage circuit；22nd, the second difference operational amplifying circuit；23rd, secondary signal is handled Circuit；
14th, the first protection circuit；15th, the second protection circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the premise of creative work Lower obtained every other embodiment, belong to the scope of the utility model protection.
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the utility model can To be mutually combined.
The utility model is described in further detail with specific embodiment below in conjunction with the accompanying drawings, but not as of the present utility model Limit.
As shown in figure 1, a kind of embodiment of the voltage sampling circuit of high voltage transducer power unit, wherein, including：
A kind of voltage sampling circuit of high voltage transducer power unit, it is characterised in that including：
Three phase mains incoming end；
First reduction voltage circuit 11, each phase of three phase mains incoming end connect one first reduction voltage circuit 11 respectively；
The neutral conductor, it is connected with each first reduction voltage circuit 11；
First difference operational amplifying circuit 12, the output end of each first reduction voltage circuit 11 connect one first difference amplifier electricity respectively Road 12；
First signal processing circuit 13, the output end of each first difference operational amplifying circuit 12 connect at one first signal respectively Manage circuit 13；
Each first signal processing circuit 13 exports the voltage of a corresponding phase respectively.
Have that cost is high, space-consuming is big or sampling precision is not high asks for voltage detecting mode of the prior art Topic, in the utility model, every one first reduction voltage circuit 11 connects the neutral conductor and from the extraction of three phase mains incoming end respectively One phase, each first reduction voltage circuit 11 connect one first difference operational amplifying circuit 12 respectively, and each difference operational amplifying circuit connects respectively again Connect one first signal processing circuit 13, the voltage of each each phase of first signal processing unit final output.
Voltage in above-mentioned technical proposal uses circuit, has low cost, strong antijamming capability, reliability high, makes power The voltage sample of unit is easily achieved, reduce board size the characteristics of.
It should be noted that the three-phase input voltage of power cell and the voltage of dc bus are adopted using same circuit Sample, make circuit design compacter.
In a kind of preferably embodiment, in addition to a two-phase power access end 2；
Second reduction voltage circuit 21, is connected with two-phase power supply incoming end 2；
Second difference operational amplifying circuit 22, it is connected with the output end of the second reduction voltage circuit 21；
Secondary signal process circuit 23, it is connected with the output end of the second difference operational amplifying circuit 22；
Secondary signal processing unit to export two-phase power supply incoming end 2 output two-phase between voltage difference.
In above-mentioned technical proposal, two-phase power supply incoming end 2 can be that one or two line terminals that connect are formed.
Resistance in first dropping resistor is equal, and the resistance in the second dropping resistor is equal, the first decompression The resistance in resistance and the second dropping resistor in resistance.
In a kind of preferably embodiment, the first difference operational amplifying circuit 12 includes：
First amplifier；
First filter capacitor, it is connected to the both ends of the output of the first reduction voltage circuit 11；
First build-out resistor, with connecing power supply；
Second build-out resistor, one end of the second build-out resistor are connected with the negative input of the first amplifier, the other end with The output end connection of first amplifier.
In above-mentioned technical proposal, each first difference operational amplifying circuit 12, in addition to 2 the first protection circuits 14, Mei Ge One protection circuit 14 includes, the first diode of forward direction connection, and the diode of Opposite direction connection one second, the first diode and the Two diodes include a common first node, and first node is connected with the input of the first amplifier, are connected with forming one first Connect node；
First connecting node by voltage between first voltage second voltage, wherein first voltage be more than second electricity Pressure.
The resistance of first build-out resistor and the second build-out resistor is equal, and the first filter capacitor is input to first and put to filter out The high-frequency noise of big device port；
Wherein input signal is mainly clamped to the supply voltage of the first amplifier by the first protection circuit 14, it is ensured that first puts The input port of big device is not damaged by.
In a kind of preferably embodiment, each first reduction voltage circuit 11 includes：
One first resistor, connected with the first build-out resistor；
One second resistance, connected with the second build-out resistor.
In above-mentioned technical side, first resistor resistance is equal with second resistance resistance, and the first build-out resistor matches electricity with second It is equal to hinder resistance.
In a kind of preferably embodiment, the second difference operational amplifying circuit 22 includes：
Second amplifier；
Second filter capacitor, it is connected to the both ends of the output of the second reduction voltage circuit 21；
3rd build-out resistor, with connecing power supply；
4th build-out resistor, one end of the second build-out resistor are connected with the negative input of the second amplifier, the other end with The output end connection of second amplifier.
In above-mentioned technical proposal, the second difference operational amplifying circuit 22 includes, 2 the second protection circuits 24, each second protection 3rd diode of the positive connection one of circuit 24, and the 4th diode of Opposite direction connection one, the 3rd diode and the four or two pole Pipe includes a common section point, and section point is connected with the input of the first amplifier, is saved with forming one second connection Point；
Second connecting node by voltage between first voltage second voltage, wherein first voltage be more than second electricity Pressure.
The resistance of 3rd build-out resistor and the 4th build-out resistor is equal, and the second filter capacitor is input to second and put to filter out The high-frequency noise of big device port；
Wherein input signal is mainly clamped to the supply voltage of the second amplifier by 2 the second protection circuits 24, it is ensured that the The input port of two amplifiers is not damaged by.
In a kind of preferably embodiment, each first reduction voltage circuit 11 includes：
One second resistance, connected with the 3rd build-out resistor；
One 3rd resistor, connected with the 4th build-out resistor.
In above-mentioned technical side, second resistance resistance is equal with 3rd resistor resistance, and the 3rd build-out resistor matches electricity with the 4th It is equal to hinder resistance.
In a kind of preferably embodiment, the first signal processing circuit 13 includes：
First operating resistance, it is connected with the output end of the first difference operational amplifying circuit 12；
3rd amplifier, it is connected with the first operating resistance；
3rd filter capacitor, with connecing power supply.
In a kind of preferably embodiment, secondary signal process circuit 23 includes：
Second operating resistance, it is connected with the output end of the first difference operational amplifying circuit 12；
4th amplifier, it is connected with the first operating resistance；
4th filter capacitor, with connecing power supply.
Illustrated below with a kind of specific embodiment, voltage sampling circuit includes：Three phase mains accesses
End, and two-phase power access end；
One end of each first reduction voltage circuit 11 is connected with the one of three phase mains incoming end, and the other end connects with the neutral conductor Connect, the output end of the first reduction voltage circuit 11 is connected with the first difference amplifier unit；
Wherein, three the first reduction voltage circuits 11 are respectively so that reduction voltage circuit A, reduction voltage circuit B, reduction voltage circuit C are represented；
Reduction voltage circuit A includes：
Resistance R1 connects with resistance R9, and resistance R2 connects with resistance R10；
Reduction voltage circuit B includes：
Resistance R3 connects with resistance R11, and resistance R4 connects with resistance R12；
Reduction voltage circuit C includes：
Resistance R5 connects with resistance R13, and resistance R6 connects with resistance R14；
First circuit represents that reduction voltage circuit D includes with reduction voltage circuit D：
Resistance R7 connects with resistance R15, and resistance R8 connects with resistance R16；
Wherein, R1=R2=R3=R4=R5=R6, R7=R8, R9=R10=R11=R12=R13=R14, R15= R16。
Three group of first difference operational amplifying circuit 12, respectively with difference operational amplifying circuit A, difference operational amplifying circuit B and difference amplifier Circuit C is represented：
Difference operational amplifying circuit A includes, the first amplifier U1, the first build-out resistor R9, the second build-out resistor R10, the first filter Ripple electric capacity C1,2 protection diodes, D1 and D2；
Difference operational amplifying circuit B includes, the first amplifier U2, the first build-out resistor R11, the second build-out resistor R12, the first filter Ripple electric capacity C2,2 protection diodes, D3 and D4；
Difference operational amplifying circuit C includes, the first amplifier U3, the first build-out resistor R13, the second build-out resistor R14, the first filter Ripple electric capacity C3,2 protection diodes, D5 and D6；
Second difference operational amplifying circuit 22 is represented with difference operational amplifying circuit D：
Difference operational amplifying circuit D includes, the second amplifier U4, the 3rd build-out resistor R15, the 4th build-out resistor R16, the second filter Ripple electric capacity C4,2 protection diodes, D7 and D8；
Wherein, R9=R10=R11=R12=R13=R14, R15=R16.
Three group of first signal processing circuit 13 is respectively with signal processing circuit A, signal processing circuit B and signal transacting electricity Road C is represented；
One group of first signal processing circuit 13 is signal processing circuit D.
Signal processing circuit A includes：First operating resistance R17, the 3rd amplifier U5, the 3rd filter capacitor C5；
Signal processing circuit B includes：First operating resistance R18, the 3rd amplifier U6, the 3rd filter capacitor C6；
Signal processing circuit C includes：First operating resistance R19, the 3rd amplifier U7, the 3rd filter capacitor C7；
Secondary signal process circuit 23 represents that signal processing circuit D includes with signal processing circuit D：Second operating resistance R20, the 4th amplifier U8, the 4th filter capacitor C8.
Above-mentioned annexation is described below；Reduction voltage circuit A, reduction voltage circuit B and reduction voltage circuit C one end 1,2,3 mouthful with three phase mains incoming end is connected respectively, and the other end is connected with the neutral conductor, reduction voltage circuit A, reduction voltage circuit B and Reduction voltage circuit C output end connects one to one with difference operational amplifying circuit A, difference operational amplifying circuit B and difference operational amplifying circuit C, Difference operational amplifying circuit A, difference operational amplifying circuit B and difference operational amplifying circuit C output end and signal processing circuit A, signal transacting Circuit B and signal processing circuit C connect one to one；
Signal processing circuit A is exporting the phase voltage from 1 mouthful of three phase mains incoming end output；
Signal processing circuit B is exporting the phase voltages from 2 mouthfuls of three phase mains incoming end output；
Signal processing circuit C is exporting the phase voltages from 3 mouthfuls of three phase mains incoming end output.
Reduction voltage circuit D is connected with two-phase power access end, and reduction voltage circuit D output end is connected with difference operational amplifying circuit D, letter Number process circuit D is connected with difference operational amplifying circuit D output end, and signal processing unit D is exporting the voltage difference between two-phase.
The foregoing is only the utility model preferred embodiment, not thereby limit embodiment of the present utility model and Protection domain, to those skilled in the art, it should can appreciate that all with the utility model specification and diagram Hold the scheme obtained by made equivalent substitution and obvious change, should be included in protection model of the present utility model In enclosing.

Claims (8)

  1. A kind of 1. voltage sampling circuit of high voltage transducer power unit, it is characterised in that including：
    Three phase mains incoming end；
    First reduction voltage circuit, each phase of the three phase mains incoming end connect first reduction voltage circuit respectively；
    The neutral conductor, it is connected with each first reduction voltage circuit；First difference operational amplifying circuit, each first reduction voltage circuit Output end connects first difference operational amplifying circuit respectively；
    First signal processing circuit, the output end of each first difference operational amplifying circuit connect at first signal respectively Manage circuit；
    Each first signal processing circuit exports the voltage of a corresponding phase respectively.
  2. 2. voltage sampling circuit according to claim 1, it is characterised in that also including a two-phase power access end；
    Second reduction voltage circuit, it is connected with the two-phase power supply incoming end；
    Second difference operational amplifying circuit, it is connected with the output end of second reduction voltage circuit；
    Secondary signal process circuit, it is connected with the output end of second difference operational amplifying circuit；
    The secondary signal processing unit is exporting the voltage difference between the two-phase of two-phase power supply incoming end output.
  3. 3. voltage sampling circuit according to claim 1, it is characterised in that first difference operational amplifying circuit includes：
    First amplifier；
    First filter capacitor, it is connected to the both ends of the output of first reduction voltage circuit；
    First build-out resistor, with connecing power supply；
    Second build-out resistor, one end of second build-out resistor is connected with the negative input of first amplifier, another End is connected with the output end of first amplifier.
  4. 4. voltage sampling circuit according to claim 3, it is characterised in that each first reduction voltage circuit includes：
    One first resistor, connected with first build-out resistor；
    One second resistance, connected with second build-out resistor.
  5. 5. voltage sampling circuit according to claim 3, it is characterised in that also including a two-phase power access end；
    Second reduction voltage circuit, it is connected with the two-phase power supply incoming end；
    Second difference operational amplifying circuit, it is connected with the output end of second reduction voltage circuit；
    Secondary signal process circuit, it is connected with the output end of second difference operational amplifying circuit；
    The secondary signal processing unit is exporting the voltage difference between the two-phase of two-phase power supply incoming end output；
    Second difference operational amplifying circuit includes：
    Second amplifier；
    Second filter capacitor, it is connected to the both ends of the output of second reduction voltage circuit；
    3rd build-out resistor, with connecing power supply；
    4th build-out resistor, one end of second build-out resistor is connected with the negative input of second amplifier, another End is connected with the output end of second amplifier.
  6. 6. voltage sampling circuit according to claim 5, it is characterised in that each first reduction voltage circuit includes：
    One second resistance, connected with the 3rd build-out resistor；
    One 3rd resistor, connected with the 4th build-out resistor.
  7. 7. voltage sampling circuit according to claim 1, it is characterised in that first signal processing circuit includes：
    First operating resistance, it is connected with the output end of first difference operational amplifying circuit；
    3rd amplifier, it is connected with first operating resistance；
    3rd filter capacitor, with connecing power supply.
  8. 8. voltage sampling circuit according to claim 2, it is characterised in that first signal processing circuit includes：
    First operating resistance, it is connected with the output end of first difference operational amplifying circuit；
    3rd amplifier, it is connected with first operating resistance；
    3rd filter capacitor, with connecing power supply；
    The secondary signal process circuit includes：
    Second operating resistance, it is connected with the output end of first difference operational amplifying circuit；
    4th amplifier, it is connected with first operating resistance；
    4th filter capacitor, with connecing power supply.
CN201720711770.6U 2017-06-19 2017-06-19 A kind of voltage sampling circuit of high voltage transducer power unit Active CN207181503U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201720711770.6U CN207181503U (en) 2017-06-19 2017-06-19 A kind of voltage sampling circuit of high voltage transducer power unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201720711770.6U CN207181503U (en) 2017-06-19 2017-06-19 A kind of voltage sampling circuit of high voltage transducer power unit

Publications (1)

Publication Number Publication Date
CN207181503U true CN207181503U (en) 2018-04-03

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ID=61734971

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201720711770.6U Active CN207181503U (en) 2017-06-19 2017-06-19 A kind of voltage sampling circuit of high voltage transducer power unit

Country Status (1)

Country Link
CN (1) CN207181503U (en)

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