CN205982398U - Converter is direct current voltage detection circuit for module - Google Patents
Converter is direct current voltage detection circuit for module Download PDFInfo
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- CN205982398U CN205982398U CN201620946423.7U CN201620946423U CN205982398U CN 205982398 U CN205982398 U CN 205982398U CN 201620946423 U CN201620946423 U CN 201620946423U CN 205982398 U CN205982398 U CN 205982398U
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Abstract
The utility model discloses a converter is direct current voltage detection circuit for module, including direct current voltage acquisition unit, first -order low -pass filtering unit, second order low -pass filtering unit and power supply unit, each unit of power supply unit and other links to each other and is used for providing each unit required power, direct current voltage acquisition unit includes current sensor and resistance unit, after establishing ties, current sensor's input is used for detecting the DC voltage with the resistance unit, current sensor's output with first -order low -pass filtering unit's input links to each other for output signal enlargies and high frequency filter, first -order low -pass filtering unit's output with second order low -pass filtering unit links to each other for high frequency filter is in order to prevent that the aliasing from appearing in back level sampling. The utility model discloses a converter is direct current voltage detection circuit for module has simple structure, gathers advantages such as the precision is high and with low costs.
Description
Technical field
This utility model relates generally to converter topology field, refers in particular to a kind of converter module DC voltage detection electricity
Road.
Background technology
Reliability in order to realize converter module controls, it usually needs detection converter module DC voltage signal.Directly
Stream voltage detecting, typically considers detection voltage scope, accuracy of detection, the parameter such as linearity, according to the parameter of various devices
Require, select optimal model, make voltage detection scheme reach the economically optimization with detection parameter.
DC bus-bar voltage collection typically using electric resistance partial pressure, capacitance partial pressure or using voltage sensor collection etc. arrange
Apply.The feature of electric resistance partial pressure and capacitance partial pressure is that structure is simple, and cheap, shortcoming is directly no isolator to introduce high potential
Acquisition system, poor safety performance, easily interference is produced to other low-voltage circuits；The advantage of voltage sensor collection is collection response
Hurry up, high precision, high-low pressure are isolated, but cost is high.
Utility model content
The technical problems to be solved in the utility model is that：The technical problem existing for prior art, this practicality is new
A kind of structure of type offer is simple, acquisition precision is high and low cost converter module DC voltage testing circuit.
For solve above-mentioned technical problem, the utility model proposes technical scheme be：
A kind of converter module DC voltage testing circuit, including DC voltage collecting unit, first-order low-pass ripple list
Unit, second-order low-pass filter unit and power supply unit, said supply unit is connected for providing needed for each unit with other each unit
Power supply, described DC voltage collecting unit includes current sensor and resistance unit, the input of described current sensor and electricity
It is used for detecting DC voltage after resistance unit series connection, the outfan of described current sensor is defeated with described first-order low-pass ripple unit
Enter end to be connected, the amplification for output signal and High frequency filter, the outfan of described first-order low-pass ripple unit and described second order
Low-pass filter unit is connected, for High frequency filter to prevent rear class sampling from aliasing.
Improvement further as technique scheme：
Described resistance unit includes multiple resistance being sequentially connected in series.
The outfan of described current sensor is connected with described first-order low-pass ripple unit through a load resistance, for will be defeated
Go out current signal and be converted into voltage signal to send to first-order low-pass ripple unit.
Said supply unit is direct current 15V power supply.
Described DC voltage collecting unit, first-order low-pass ripple unit, second-order low-pass filter unit and power supply unit are all pacified
It is loaded on same pcb board.
Compared with prior art, the utility model has the advantage of：
Converter module of the present utility model DC voltage testing circuit, carries out partial pressure using resistance unit, electric current passes
The sample mode that sensor is isolated, not only makes acquisition precision high, and low cost simultaneously will not produce dry to other circuit units
Disturb.Isolated additionally, due to using current sensor, from without adopting insulating power supply, simplified the knot of power supply unit
Structure.
Brief description
Fig. 1 is circuit theory diagrams of the present utility model.
In figure label represents：1st, DC voltage collecting unit；11st, current sensor；2nd, first-order low-pass ripple unit；3rd, two
Rank low-pass filter unit.
Specific embodiment
Below in conjunction with Figure of description and specific embodiment, this utility model is further described.
As shown in figure 1, the converter module of the present embodiment DC voltage testing circuit, including DC voltage collecting unit
1st, first-order low-pass ripple unit 2, second-order low-pass filter unit 3 and power supply unit, power supply unit is connected with other each unit and is used for
There is provided power supply needed for each unit, DC voltage collecting unit 1 includes current sensor 11 and resistance unit, current sensor 11
Input is used for detecting DC voltage, the outfan of current sensor 11 and first-order low-pass ripple unit with resistance unit after connecting
2 input is connected, the amplification for output signal and High frequency filter, and the outfan of first-order low-pass ripple unit 2 is low with second order
Pass filtering unit 3 is connected, for High frequency filter to prevent rear class sampling from aliasing.Converter module of the present utility model is with directly
Stream voltage detecting circuit, carries out partial pressure using resistance unit, sample mode that current sensor 11 is isolated, not only so that adopting
Collection high precision, low cost simultaneously, interference will not be produced to other circuit units.Additionally, due to using current sensor 11 carry out every
From from without adopting insulating power supply, simplifying the structure of power supply unit.
In the present embodiment, resistance unit includes multiple resistance being sequentially connected in series, and the RA1～RAn in such as Fig. 1, for connecting
Partial pressure.Wherein current sensor can adopt the LV 25-P/SP5 of LEM company.
Below converter module DC voltage testing circuit of the present utility model is described in detail：
Converter module DC voltage mostly is 800VDC～3000VDC, connects to DC voltage collecting unit 1 (in Fig. 1
A part), DC voltage collecting unit 1 carries out, using resistance RA1～RAn, partial pressure of connecting, and current value sends into current sensor 11
(NV1 in Fig. 1), because current sensor 11 former limit, secondary side current value are very little, only tens milliamperes ranks, thus realize height
The isolation of low pressure and measurement, and be suitable for being directly installed on PCB with other each unit.Series resistance all-in resistance value
For：
Wherein：Vmax is the ceiling voltage of DC capacitor；The input current of the former limit for current sensor 11 for the I1.
The quantity of resistant series is
Wherein：R is the resistance of single resistance.
The power of single resistance and voltage must are fulfilled for following two formulas simultaneously
PR≥K1I1 2R (3)
UR≥K1I1R (4)
Wherein：K1 is Margin coefficient, typically takes 2.5～4；
The current signal of current sensor 11NV1 output is converted to voltage signal through load resistance R1.
First-order low-pass ripple (the b part in Fig. 1), the amplification for signal and High frequency filter, reach rear class output circuit
Accessible ideal range.Its transmission function is：
Cut-off frequency is：
Amplification is：
In addition, when equal interval sampling is carried out to continuous signal, if sampling thheorem can not be met, the frequency of sampled signal
Will be overlapping, that is, the frequency content being higher than sample frequency half will be reconstructed into the signal less than sample frequency half, this frequency
The distortion that the overlap of spectrum leads to is referred to as aliasing.For preventing from aliasing occurring it is necessary to pass through second-order low-pass filter unit 3 during rear class sampling
(c part in Fig. 1) further high-frequency signal is filtered so that the highest frequency of output signal is less than the sample frequency of rear class
Half.Work as R6=R7=R, during C3=C4=C, transmission function is：
Cut-off frequency is：
Amplification is：
Ac=1 (10)
The output of second-order low-pass filter can be directly fed to AD sampling A/D chip or voltage-frequency conversion, completes d. c. voltage signal
Calculate, protect, show.
In addition power supply employing ± 15V powers, and can be carried by power module, regulated power supply or other power supply modes
For, isolate high pressure because after current sensor 11NV1 secondary side, so ± 15V power supply does not need to be isolated, letter
Change the structure of power supply unit.
Although this utility model is disclosed above with preferred embodiment, but it is not limited to this utility model.Any
Those of ordinary skill in the art, in the case of without departing from technical solutions of the utility model scope, can be utilized the disclosure above
Technology contents technical solutions of the utility model are made with many possible variations and modification, or be revised as the equivalent of equivalent variations
Embodiment.Therefore, every content without departing from technical solutions of the utility model, according to this utility model technical spirit to above reality
Apply any simple modification, equivalent variations and the modification that example is made, all should fall in the range of technical solutions of the utility model protection.
Claims (5)
1. a kind of converter module with DC voltage testing circuit it is characterised in that include DC voltage collecting unit (1), one
Rank low-pass filter unit (2), second-order low-pass filter unit (3) and power supply unit, said supply unit is connected with other each unit
For providing power supply needed for each unit, described DC voltage collecting unit (1) includes current sensor (11) and resistance unit, institute
State current sensor (11) input connect with resistance unit after be used for detecting DC voltage, described current sensor (11)
Outfan is connected with the input of described first-order low-pass ripple unit (2), the amplification for output signal and High frequency filter, described
The outfan of first-order low-pass ripple unit (2) is connected with described second-order low-pass filter unit (3), for High frequency filter to prevent after
Aliasing in level sampling.
2. converter module according to claim 1 with DC voltage testing circuit it is characterised in that described resistance unit
Including multiple resistance being sequentially connected in series.
3. converter module according to claim 1 and 2 with DC voltage testing circuit it is characterised in that described electric current
The outfan of sensor (11) is connected with described first-order low-pass ripple unit (2) through a load resistance, for believing output current
Number being converted into voltage signal sends to first-order low-pass ripple unit (2).
4. converter module according to claim 1 and 2 with DC voltage testing circuit it is characterised in that described power supply
Unit is direct current 15V power supply.
5. converter module according to claim 1 and 2 with DC voltage testing circuit it is characterised in that described direct current
Voltage acquisition unit (1), first-order low-pass ripple unit (2), second-order low-pass filter unit (3) and power supply unit are mounted on same
On pcb board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620946423.7U CN205982398U (en) | 2016-08-25 | 2016-08-25 | Converter is direct current voltage detection circuit for module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620946423.7U CN205982398U (en) | 2016-08-25 | 2016-08-25 | Converter is direct current voltage detection circuit for module |
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| Publication Number | Publication Date |
|---|---|
| CN205982398U true CN205982398U (en) | 2017-02-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510535A (en) * | 2018-12-06 | 2019-03-22 | 国电南瑞科技股份有限公司 | A kind of three-machine excitation single-phase rectifier energized circuit and continued flow resistance selection method |
-
2016
- 2016-08-25 CN CN201620946423.7U patent/CN205982398U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510535A (en) * | 2018-12-06 | 2019-03-22 | 国电南瑞科技股份有限公司 | A kind of three-machine excitation single-phase rectifier energized circuit and continued flow resistance selection method |
| CN109510535B (en) * | 2018-12-06 | 2022-01-25 | 国电南瑞科技股份有限公司 | Three-machine excitation single-phase rectification excitation loop and follow current resistance model selection method |
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| GR01 | Patent grant |