CN201096828Y - A three-phase current detection circuit for AC frequency converter - Google Patents
A three-phase current detection circuit for AC frequency converter Download PDFInfo
- Publication number
- CN201096828Y CN201096828Y CNU2007201844597U CN200720184459U CN201096828Y CN 201096828 Y CN201096828 Y CN 201096828Y CN U2007201844597 U CNU2007201844597 U CN U2007201844597U CN 200720184459 U CN200720184459 U CN 200720184459U CN 201096828 Y CN201096828 Y CN 201096828Y
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- detection circuit
- phase current
- frequency converter
- analog switch
- mcu
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Abstract
The utility model discloses a three-phase current detection circuit of an AC frequency converter, which is in series connection with a non-inductance resistor R1 on a DC bus of the frequency converter. The current value reflected on the non-inductance resistor R1 passing through two sets of detection circuits with the same structure after the upgrading is transmitted to the MCU. The detection circuit comprises an analog switch for the high frequency sampling hold, and an operational amplified circuit. The analog switch is controlled through the GAL chip IC linked with the MCU. For the sampling of the voltage on the resistance reflected through the two-phase current of an AC motor, the use of high-cost sensors is avoided. Therefore, the production cost is significantly reduced with a simple structure and stable working performance.
Description
Technical field
The utility model relates to the speed regulating control field of three phase alternating current motor, relates in particular to the three-phase current detection circuit of AC converter.
Background technology
Realization is to three phase alternating current motor high-performance speed regulating control, and prior art adopts the method for AC frequency conversion.AC converter is the three-phase supply of voltage of output and frequency adjustable joint, thus the speed of regulating alternating current generator.In order to realize that to the high performance speed governing of alternating current generator, controller need obtain the three-phase electricity flow valuve of alternating current generator, promptly need the alternating current generator three-phase current is sampled, then according to its value and other related data.In the prior art, what current sample was used is Hall current sensor, any two two Hall current sensors that join in the three phase alternating current motor of need samplings.The cost of Hall current sensor is higher, and the application on current sample will possess higher technical requirement to Hall current sensor.
The utility model content
The technical problems to be solved in the utility model provides a kind of three-phase current detection circuit of AC converter, and manufacturing requirements is low, and production cost is low.
For solving the problems of the technologies described above, the utility model adopts following technical scheme: the three-phase current detection circuit of this AC converter noninductive resistance R1 that connects on the dc bus of frequency converter, after promoting, the current value that reflects on the described noninductive resistance R1 imports MCU through two groups of identical testing circuits of structure, described testing circuit comprises analog switch, the operational amplification circuit that is used for high frequency sampling maintenance, described analog switch is controlled by the GAL chip IC, and described GAL chip IC is connected with MCU.
The utility model adopts technique scheme, and the biphase current of alternating current generator is reflected at ohmically voltage sample, has avoided adopting expensive sensor, greatly reduces production cost, and is simple in structure, stable work in work.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is further specified.
Fig. 1 is the circuit diagram of the three-phase current detection circuit of a kind of AC converter of the utility model.
Embodiment
As shown in Figure 1, noninductive resistance R1 of series connection on the dc bus of frequency converter, because the PWM frequency height of frequency converter, and can only react biphase current and zero current on the noninductive resistance R1 in the cycle at a PWM, the electric current that reacts on noninductive resistance R1 must be discontinuous like this, so input analog switch IC1 the current value process of noninductive resistance R1 reflection is connected the clamping circuit castering action that forms by resistance R 2 and resistance R 3 after, among the analog switch IC2, analog switch IC1 and IC2 are subjected to the control of GAL chip IC, adopt analog switch IC1, IC2 and GAL chip IC are in conjunction with electric current being carried out the hardware decoding and keeping; Resistance because of noninductive resistance R1 is very little again, and the pressure drop that is reflected on the noninductive resistance R1 is very little, so the current signal that analog switch IC1 and IC2 sampling keep amplifies in the back input MCU through two operational amplification circuits that work alone again; The GAL chip IC is connected with MCU, thereby realizes noninductive resistance R1 sampling and isolate the purpose of three-phase current in conjunction with software, and then the three-phase current of AC converter is detected.
Claims (1)
1, a kind of three-phase current detection circuit of AC converter, it is characterized in that: noninductive resistance R1 of series connection on the dc bus of frequency converter, after promoting, the current value that reflects on the described noninductive resistance R1 imports MCU through two groups of identical testing circuits of structure, described testing circuit comprises analog switch, the operational amplification circuit that is used for high frequency sampling maintenance, described analog switch is controlled by the GAL chip IC, and described GAL chip IC is connected with MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201844597U CN201096828Y (en) | 2007-10-16 | 2007-10-16 | A three-phase current detection circuit for AC frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201844597U CN201096828Y (en) | 2007-10-16 | 2007-10-16 | A three-phase current detection circuit for AC frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201096828Y true CN201096828Y (en) | 2008-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201844597U Expired - Fee Related CN201096828Y (en) | 2007-10-16 | 2007-10-16 | A three-phase current detection circuit for AC frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201096828Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981042A (en) * | 2012-12-07 | 2013-03-20 | 深圳市安邦信电子有限公司 | Three-phase current detection circuit for frequency converter |
| CN103760411A (en) * | 2013-11-06 | 2014-04-30 | 国网安徽省电力公司淮南供电公司 | Direct-current bus voltage wave-recording device |
| CN106602903A (en) * | 2016-12-30 | 2017-04-26 | 广东美的制冷设备有限公司 | Air purifier and control device and method of ion generator |
| CN106621732A (en) * | 2016-12-30 | 2017-05-10 | 广东美的制冷设备有限公司 | Ion purifier and control method and device thereof |
| CN106655828A (en) * | 2016-12-30 | 2017-05-10 | 广东美的制冷设备有限公司 | Ion purifier, and control method and apparatus thereof |
-
2007
- 2007-10-16 CN CNU2007201844597U patent/CN201096828Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981042A (en) * | 2012-12-07 | 2013-03-20 | 深圳市安邦信电子有限公司 | Three-phase current detection circuit for frequency converter |
| CN103760411A (en) * | 2013-11-06 | 2014-04-30 | 国网安徽省电力公司淮南供电公司 | Direct-current bus voltage wave-recording device |
| CN106602903A (en) * | 2016-12-30 | 2017-04-26 | 广东美的制冷设备有限公司 | Air purifier and control device and method of ion generator |
| CN106621732A (en) * | 2016-12-30 | 2017-05-10 | 广东美的制冷设备有限公司 | Ion purifier and control method and device thereof |
| CN106655828A (en) * | 2016-12-30 | 2017-05-10 | 广东美的制冷设备有限公司 | Ion purifier, and control method and apparatus thereof |
| CN106621732B (en) * | 2016-12-30 | 2019-08-30 | 广东美的制冷设备有限公司 | Ion purifier and its control method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: ZHEJIANG HIZHEN ELECTRONICS TECHNOLOGY CO., LTD. Free format text: FORMER NAME: HUZHOU HAIZHEN ELECTRONIC TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 313100 Industrial Park, eight Li Town, Zhejiang, Huzhou Patentee after: Zhejiang Haizhen Electronic Technology Co., Ltd. Address before: 313000 Zhejiang Wuxing Industry Park Huzhou Huzhou vibration Electronic Technology Co., Ltd. Patentee before: Huzhou Haizhen Electronic Scientific And Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080806 Termination date: 20151016 |
|
| EXPY | Termination of patent right or utility model |