CN201877999U - Current sampling circuit of frequency converter - Google Patents
Current sampling circuit of frequency converter Download PDFInfo
- Publication number
- CN201877999U CN201877999U CN2010206445716U CN201020644571U CN201877999U CN 201877999 U CN201877999 U CN 201877999U CN 2010206445716 U CN2010206445716 U CN 2010206445716U CN 201020644571 U CN201020644571 U CN 201020644571U CN 201877999 U CN201877999 U CN 201877999U
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- hall
- operational amplifier
- frequency converter
- resistance
- output
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Abstract
The utility model relates to a current sampling circuit of a frequency converter, which is characterized by comprising a Hall integrated circuit (IC), wherein an input end of the Hall IC is respectively connected with an insulated gate bipolar transistor (IGBT) output end of the frequency converter and a frequency converter output end, and an output end of the Hall IC is connected with a conditioning circuit. Further, the conditioning circuit comprises an operational amplifier U1B, and an in-phase input end of the operational amplifier U1B is connected with the output end of the Hall IC through a resistance R1; and a resistance R2 is connected onto the in-phase input end of the operational amplifier U1B, and a resistance R3 is in bridge connection between a reverse-phase input end and an output end of the operational amplifier U1B. In the utility model, the requirements of the current sampling of the frequency converter can be met by fewer devices, and the manufacturing cost is reduced.
Description
Technical field
The utility model relates to a kind of inverter current sample circuit.
Background technology
Frequency converter is to use converter technique and microelectric technique, and the frequency by changing the machine operation power supply and the mode of amplitude are controlled the Electric Drive element of alternating current motor.In frequency converter, need to use current sampling circuit, application number a kind of current sampling circuit module of frequency converter that has been 200720063866.2 patent disclosure, this module need be made of a plurality of linear optical couplings, a plurality of voltage-stabiliser tube, a plurality of resistance, a plurality of electric capacity and power operational amplifier, its complex structure has improved manufacturing cost.
Summary of the invention
The purpose of this utility model provides a kind of inverter current sample circuit simple in structure.
In order to achieve the above object, the technical solution of the utility model has provided a kind of inverter current sample circuit, it is characterized in that, comprises Hall IC, the input of Hall IC connects the IGBT output and the inverter output terminal of frequency converter respectively, and the output of Hall IC connects modulate circuit.
Further, described modulate circuit comprises operational amplifier U1B, the in-phase input end of operational amplifier U1B connects the output of described Hall IC by resistance R 1, be connected with earth resistance R2 on the in-phase input end of operational amplifier U1B, cross-over connection resistance R 3 between the inverting input of operational amplifier U1B and the output.
The utility model adopts less device can satisfy the requirement that inverter current adopts, and has reduced manufacturing cost.
Description of drawings
A kind of inverter current sample circuit electrical schematic diagram that Fig. 1 provides for the utility model.
Embodiment
Specify the utility model below in conjunction with embodiment.
Embodiment
As shown in Figure 1, a kind of inverter current sample circuit for the utility model provides comprises Hall IC, and the input of Hall IC connects the IGBT output and the inverter output terminal of frequency converter respectively, and the output of Hall IC connects modulate circuit.Modulate circuit comprises operational amplifier U1B, the in-phase input end of operational amplifier U1B connects the output of Hall IC by resistance R 1, be connected with earth resistance R2 on the in-phase input end of operational amplifier U1B, cross-over connection resistance R 3 between the inverting input of operational amplifier U1B and the output.
Part is an A phase output as shown in Figure 1, and other two-phase is identical with it.Capacitor C 1, capacitor C 2 and capacitor C 3 are the configuration circuit of Hall IC, and the modulate circuit that the output signal of Hall IC is formed through resistance R 1, resistance R 2, resistance R 3, amplifier U1B and capacitor C 4 constitutes current sampling circuit.This circuit is compared with the sample circuit of compositions such as power samples resistance, isolation linear light lotus root, amplifier, has saved power samples resistance, particularly isolates the required independent current source of linear light lotus root.This circuit reduction design, make whole system succinctly reliable, with less device, realized current sample.
Claims (2)
1. an inverter current sample circuit is characterized in that, comprises Hall IC, and the input of Hall IC connects the IGBT output and the inverter output terminal of frequency converter respectively, and the output of Hall IC connects modulate circuit.
2. a kind of inverter current sample circuit as claimed in claim 1, it is characterized in that, described modulate circuit comprises operational amplifier U1B, the in-phase input end of operational amplifier U1B connects the output of described Hall IC by resistance R 1, be connected with earth resistance R2 on the in-phase input end of operational amplifier U1B, cross-over connection resistance R 3 between the inverting input of operational amplifier U1B and the output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206445716U CN201877999U (en) | 2010-12-07 | 2010-12-07 | Current sampling circuit of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206445716U CN201877999U (en) | 2010-12-07 | 2010-12-07 | Current sampling circuit of frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201877999U true CN201877999U (en) | 2011-06-22 |
Family
ID=44165907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206445716U Expired - Fee Related CN201877999U (en) | 2010-12-07 | 2010-12-07 | Current sampling circuit of frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201877999U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545161A (en) * | 2012-02-09 | 2012-07-04 | 西安理工大学 | Overcurrent protection device of variable-frequence governor |
| CN103095102A (en) * | 2013-01-15 | 2013-05-08 | 华为技术有限公司 | Frequency converter controlling method and frequency converter controlling equipment and frequency converter |
| CN103293358A (en) * | 2013-04-25 | 2013-09-11 | 湘煤立达矿山装备股份有限公司 | Current detecting module for variable-frequency speed controller |
-
2010
- 2010-12-07 CN CN2010206445716U patent/CN201877999U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545161A (en) * | 2012-02-09 | 2012-07-04 | 西安理工大学 | Overcurrent protection device of variable-frequence governor |
| CN103095102A (en) * | 2013-01-15 | 2013-05-08 | 华为技术有限公司 | Frequency converter controlling method and frequency converter controlling equipment and frequency converter |
| CN103095102B (en) * | 2013-01-15 | 2016-12-07 | 华为技术有限公司 | Frequency converter control method and equipment and converter |
| CN103293358A (en) * | 2013-04-25 | 2013-09-11 | 湘煤立达矿山装备股份有限公司 | Current detecting module for variable-frequency speed controller |
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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 |
Granted publication date: 20110622 Termination date: 20151207 |
|
| EXPY | Termination of patent right or utility model |