CN205304600U - A output current module of sampling for converter - Google Patents
A output current module of sampling for converter Download PDFInfo
- Publication number
- CN205304600U CN205304600U CN201620084906.0U CN201620084906U CN205304600U CN 205304600 U CN205304600 U CN 205304600U CN 201620084906 U CN201620084906 U CN 201620084906U CN 205304600 U CN205304600 U CN 205304600U
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- CN
- China
- Prior art keywords
- current sampling
- sampling module
- module
- optocoupler
- current sample
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model discloses an output current module of sampling for converter, which comprises a mainboard, drive plate and current sample circuit board, be provided with switching power supply module on the current sample circuit board, U looks current sample module, V looks current sample module, switching power supply module respectively with U looks current sample module, V looks current sample module links to each other, and switching power supply module adopts miniwatt flyback switching power supply output power supply, U looks current sample module includes the operational amplifier an of two double -phase companies, opto -coupler an and opto -coupler b, V looks current sample module includes the operational amplifier b of two double -phase companies, opto -coupler c and opto -coupler d, the current sample circuit board is connected with the drive plate through connecting terminal, the drive plate is connected with the mainboard realizes the sampled value transmission. Compared with the prior art, the utility model cost greatly reduced, layout structure optimize more and the electrical separation can be good, and the interference killing feature is strong, and the precision of just sampling is higher, accord with the design original intention of economical converter.
Description
Technical field
The utility model relates to converter technology field, particularly a kind of frequency converter output current sampling module,This module is the important component part in frequency converter, be mainly used in isolation sampling to frequency converter output current,Monitoring.
Background technology
Frequency converter output current sampling module is the vitals in frequency converter, its main function be realize rightTwo-phase in frequency converter output three-phase is carried out current sample, realizes normal operation control and the tune of frequency converter with thisWhole, and carry out necessary protection action while breaking down.
In existing technology, what Low Cost Frequency Converters current sample modular design adopted is to use two optocouplersAfter sampling, isolation amplifier chip HP7840 or AMC1200 connect TL082 operational amplifier furtherAmplify output, and the two-phase power supply of sampling and the therefore necessary change using on drive plate of main circuit isolationDepressor secondary voltage provides extra power supply. This circuit structure design is used light-coupled isolation amplifier chipCost increases greatly, and the increase of the design of transformer cost of main switch power supply, wiring and cloth on drive plateIt is complicated that office becomes because need to consider electrical isolation, is not easy to the location of Low Cost Frequency Converters.
Utility model content
The purpose of this utility model is to overcome above shortcomings in prior art, and a kind of circuit is providedMore rationally, simply, electrical isolation performance is good, the frequency converter electricity that current sample accuracy is higher for structural designStream sample circuit.
The technical scheme in the invention for solving the above technical problem is achieved in that
For the output current sampling module of frequency converter, comprise mainboard, drive plate and current sample wiring board,On current sample wiring board, be provided with switch power module, U phase current sampling module and V phase current samplingModule, described switch power module respectively with U phase current sampling module, V phase current sampling module be connected,And described switch power module adopts small-power inverse-excitation type switch power-supply output power supply, described U phaseCurrent sample module comprises between two connected operational amplifier a, plays the optocoupler a of linear output action and playThe optocoupler b of feedback effect, described V phase current sampling module comprises between two connected operational amplifier b, risesTo the optocoupler c and the optocoupler d that plays feedback effect of linear output action, described current sample wiring board passes throughSplicing ear is connected with drive plate, and described drive plate is connected with mainboard and realizes sampled value transmission.
As preferably, described current sample wiring board is of a size of 34mm*40mm.
As preferably, described U phase current sampling module is that the U in frequency converter output U/V/W three-phase exports mutuallyCurrent sample operational amplification circuit.
As preferably, described V phase current sampling module is that the V in frequency converter output U/V/W three-phase exports mutuallyCurrent sample operational amplification circuit.
As preferably, described operational amplifier a, operational amplifier b is universal specification operational amplifierLM358。
As preferably, described optocoupler a, optocoupler b, optocoupler c, optocoupler d is universal optocoupler TLP181.
The utility model compared with prior art, has the following advantages and effect:
The utility model is U phase current sampling module, V phase current sampling module, and switch power module is integratedOn current sample wiring board and design size size to fit, discharge drive plate arrangement space, to drive plateThe designing requirement of upper switching mode power supply transformer reduces, and what this frequency converter U/V phase current sampling module adopted is logicalThe linear optical coupling amplifying circuit that adds 2 universal optocoupler compositions with type operational amplifier, one of them optocoupler doesLinear transfer effect, an optocoupler does feedback effect.
And the utility model additional designs small-power inverse-excitation type switch power-supply module offer mutually 2 tunnels of U/VThe independently-powered voltage of current sample module, adopts inverse-excitation type switch power-supply be applicable to small-power output and makeIsolation between must inputting and export, U/V is the also isolation mutually of output voltage of 2 road current sample modules mutually, increasesThe strong antijamming capability of circuit; Current sample wiring board is connected with drive plate, adopts optocoupler with prior artThe current sample amplifying circuit of isolation amplifier chip composition is compared cost and is greatly reduced, and layout structure is optimized moreAnd electrical isolation performance is good, and antijamming capability is strong, and sampling precision is higher, meets Low Cost Frequency ConvertersDesign original intention.
Brief description of the drawings
Fig. 1 is the current sample amplifying circuit that prior art adopts light-coupled isolation amplifier chip composition
Fig. 2 is the utility model frequency converter output current sampling module structural representation.
Detailed description of the invention
With reference to the utility model frequency converter output current sampling module structural representation in accompanying drawing 2, the present embodimentThe output current sampling module for frequency converter, comprise mainboard, drive plate and current sample wiring board,On current sample wiring board, be provided with switch power module, U phase current sampling module and V phase current sampling mouldPiece, described switch power module respectively with U phase current sampling module, V phase current sampling module be connected,Described U phase current sampling module comprises between two connected operational amplifier a, plays the light of linear output actionCoupling a with play the optocoupler b of feedback effect, described V phase current sampling module comprises that connected between two computing putsLarge device b, play the optocoupler c and the optocoupler d that plays feedback effect, described current sample of linear output actionWiring board is connected with drive plate by splicing ear, and described drive plate is connected and realizes sampling with this with mainboardTransmission after current value operation amplifier.
Wherein said switch power module adopts small-power inverse-excitation type switch power-supply output power supply, U phaseCurrent sample module, V phase current sampling module are respectively U phase, the V in frequency converter output U/V/W three-phasePhase output current sampling operational amplification circuit. Described U phase current sampling module, V phase current sampling module,Switch power module is connected to each other between two; Described operational amplifier a, operational amplifier b are universal specificationOperational amplifier LM358, described optocoupler a, optocoupler b, optocoupler c, optocoupler d is universal optocoupler TLP181.
In the present embodiment by U phase current sampling module, V phase current sampling module, switch power module is all establishedMeter is on current sample wiring board, and designed lines board size is 34mm*40mm, and design size is reasonable, releasesPut drive plate arrangement space, optimize electrical isolation performance, greatly reduce production costs.
U phase current sampling module in the present embodiment, when volume that V phase current sampling module adopts 1 generalThe linear operation amplifying circuit of operational amplifier and 2 universal optocoupler compositions, this circuit cost is low, isolationPerformance is good, and sampling precision is high.
In addition it should be noted that, the described specific embodiment in this description, the shape of its parts,Institute's title of being named etc. can be different, and the above content described in this description is only to the utility model structureExample explanation. Allly do according to structure, feature and principle the utility model patent design describedEquivalence changes or simple change, is included in the protection domain of the utility model patent. The utility model instituteStating those skilled in the art can do various Revision and supplements or adopt described concrete enforcementSubstitute by similar mode, only otherwise depart from structure of the present utility model or surmount these claims and determineThe scope of justice, all should belong to protection domain of the present utility model.
Claims (6)
1. for the output current sampling module of frequency converter, it is characterized in that, comprise mainboard, drive plate and electric currentSampling circuit plate is provided with switch power module, U phase current sampling mould on current sample wiring boardPiece and V phase current sampling module, described switch power module respectively with U phase current sampling module,V phase current sampling module is connected, and described switch power module adopts small-power flyback switching electricitySource output power supply, described U phase current sampling module comprise between two connected operational amplifier a,The optocoupler a and the optocoupler b that plays feedback effect that play linear output action, described V phase current is adoptedOriginal mold piece comprises between two connected operational amplifier b, plays the optocoupler c of linear output action and playThe optocoupler d of feedback effect, described current sample wiring board is connected with drive plate by splicing ear,Described drive plate is connected with mainboard and realizes sampled value transmission.
2. the output current sampling module for frequency converter according to claim 1, is characterized in that: instituteThe current sample wiring board of stating is of a size of 34mm × 40mm.
3. the output current sampling module for frequency converter according to claim 1, is characterized in that: instituteStating U phase current sampling module is the U phase output current sampling fortune in frequency converter output U/V/W three-phaseCalculate amplifying circuit.
4. the output current sampling module for frequency converter according to claim 1, is characterized in that: instituteStating V phase current sampling module is that the V phase output current that frequency converter is exported in U/V/W three-phase is adoptedSample operational amplification circuit.
5. the output current sampling module for frequency converter according to claim 1, is characterized in that: instituteOperational amplifier a, the operational amplifier b stating is universal specification operational amplifier LM358.
6. the output current sampling module for frequency converter according to claim 1, is characterized in that: instituteOptocoupler a, optocoupler b, optocoupler c, the optocoupler d stating is universal optocoupler TLP181.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620084906.0U CN205304600U (en) | 2016-01-24 | 2016-01-24 | A output current module of sampling for converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620084906.0U CN205304600U (en) | 2016-01-24 | 2016-01-24 | A output current module of sampling for converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205304600U true CN205304600U (en) | 2016-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620084906.0U Expired - Fee Related CN205304600U (en) | 2016-01-24 | 2016-01-24 | A output current module of sampling for converter |
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| Country | Link |
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| CN (1) | CN205304600U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410885A (en) * | 2016-06-29 | 2017-02-15 | 常熟市立得电器有限公司 | Charging controller for electric vehicle |
-
2016
- 2016-01-24 CN CN201620084906.0U patent/CN205304600U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410885A (en) * | 2016-06-29 | 2017-02-15 | 常熟市立得电器有限公司 | Charging controller for electric vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160608 Termination date: 20210124 |