CN201654109U - Current sampling circuit of fully-digital alternating current servo driver - Google Patents
Current sampling circuit of fully-digital alternating current servo driver Download PDFInfo
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- CN201654109U CN201654109U CN2010201432584U CN201020143258U CN201654109U CN 201654109 U CN201654109 U CN 201654109U CN 2010201432584 U CN2010201432584 U CN 2010201432584U CN 201020143258 U CN201020143258 U CN 201020143258U CN 201654109 U CN201654109 U CN 201654109U
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Abstract
A current sampling circuit of a fully-digital alternating current servo driver relates to a current sampling circuit, and solves the problems that current sampling is lower in accuracy and can not reach the requirement of high accuracy. The current sampling circuit comprises a sampling resistor, a linear light coupler, a calculation amplifier, an analog-digital conversion unit and a digital signal processor, and is characterized in that the digital signal processor is provided with a temperature compensation unit and a current calculating unit; a temperature sensor is arranged on the surface of the sampling resistor; the temperature sensor is connected with the temperature compensation unit through the analog-digital conversion unit; the temperature compensation unit receives temperature signals to compensate resistor value of the sampling resistor; and voltage pressure of the sampling resistor is connected with a current calculating unit through a linear light coupler, a calculating amplifier and the analog-digital conversion unit. The current sampling circuit uses the sampling resistor to sample and has small volume, and the temperature compensation unit compensates temperature for the sampling resistor, thereby increasing current sampling accuracy.
Description
[technical field]
The utility model relates to a kind of current sampling circuit, refers to a kind of current sampling circuit of Digital AC Servo Driver especially.
[background technology]
Digital AC Servo Driver is industries such as widespread use numerically-controlled machine, package packing machine, dyeing textile machinery, robot, and Digital AC Servo Driver must be carried out sampling monitoring to the phase current of servomotor to the control of servomotor.The current sampling circuit of existing Digital AC Servo Driver has two kinds of schemes.First kind of scheme is made up of current sensor, operational amplifier and modulus conversion chip, wherein current sensor is serially connected in the direct current phase line of servomotor, its voltage signal output is amplified through operational amplifier, through modulus conversion chip analog voltage signal is converted to digital signal output again.This sample circuit is owing to there is the weak point that volume is big, cost is high in the reason of current sensor.Second kind of scheme is made up of sampling resistor, linear optocoupler, operational amplifier and modulus conversion chip, wherein sampling resistor is serially connected in the phase current of servomotor, these sampling resistor two ends are taken out voltage and are input to linear optocoupler, the linear optocoupler output voltage amplifies through operational amplifier, through modulus conversion chip analog voltage signal is converted to digital signal output again.Second kind of scheme has the advantage that volume is little, cost is low, but in the Digital AC Servo Driver operational process, the resistance value of sampling resistor varies with temperature, under the different situation of temperature, even electric current is identical, the sampling resistor both end voltage is also different, because of current value is the ratio of voltage and resistance, exist than big-difference so calculate current value and actual value, the current sample precision is lower, does not reach high-precision requirement.
[utility model content]
The technical assignment of the technical problems to be solved in the utility model and proposition is that the prior art scheme is improved and improved, and provides a kind of current sampling circuit of Digital AC Servo Driver, to reach the little purpose of sampling precision height and volume.For this reason, the utility model is taked following technical scheme:
A kind of current sampling circuit of Digital AC Servo Driver, comprise the sampling resistor that is used to detect electric machine phase current, linear optocoupler, operational amplifier, AD conversion unit and the digital signal processor that connect successively, it is characterized in that: the current calculation unit that described digital signal processor is provided with temperature compensation unit and links to each other with temperature compensation unit; Described sampling resistor surface is provided with a temperature sensor, and temperature sensor links to each other with temperature compensation unit through AD conversion unit, and temperature compensation unit receives the resistance value of temperature signal compensating sampling resistance to eliminate the influence of temperature to the resistance of sampling resistor; The information of voltage of sampling resistor links to each other with current calculation unit by linear optocoupler, operational amplifier and AD conversion unit, and current calculation unit calculates electric machine phase current according to the information of voltage of sampling resistor and the resistance value of the sampling resistor after the compensation.Use sampling resistor to current sample, volume is little, and temperature compensation unit carries out temperature compensation to sampling resistor, has improved the current sample precision.
As the further of technique scheme improved and replenish, the utility model also comprises following additional technical feature:
Described digital signal processor is the DSP digital signal processor that is provided with AD conversion unit.AD conversion unit and digital signal processor are united two into one, reduce aerial lug, avoid interference, reduce volume when reducing cost.
Beneficial effect:
The sampling of use sampling resistor, volume is little, and temperature compensation unit carries out temperature compensation to sampling resistor, has improved the current sample precision.
[description of drawings]
Fig. 1 is the utility model circuit block diagram.
[embodiment]
Below in conjunction with Figure of description the technical solution of the utility model is described in further detail.
As shown in Figure 1, the utility model comprises the sampling resistor R1 that is used to detect electric machine phase current, linear optocoupler U1, operational amplifier 2 and the DSP digital signal processor 3 that connects successively, the current calculation unit 33 that digital signal processor 3 is provided with AD conversion unit 31, temperature compensation unit 32 and links to each other with temperature compensation unit 32; Sampling resistor R1 surface is provided with a temperature sensor 4, temperature sensor 4 links to each other with the temperature compensation unit 32 of digital signal processor 3 through AD conversion unit 31, and temperature compensation unit 32 receives temperature signal compensating sampling resistance R 1 resistance value to eliminate the influence of temperature to the resistance of sampling resistor R1; The information of voltage of sampling resistor R1 links to each other with current calculation unit 33 by linear optocoupler U1, operational amplifier 2 and AD conversion unit 31, and current calculation unit 33 calculates electric machine phase current according to the information of voltage of sampling resistor R1 and the sampling resistor R1 value after the compensation.
Wherein sampling resistor R1 is serially connected in the phase line of servomotor 1.Sampling resistor R1 is connected with No. 2 pin of linear optocoupler U1 with the end that servomotor 1 links to each other, and is provided with current-limiting resistance R2 therebetween; The other end of sampling resistor R1 then links to each other with No. 3 pin of linear optocoupler U1; Be provided with the C2 of filter capacitor between No. 2, No. 3 pin of linear optocoupler U1, No. 6, No. 7 pin of linear optocoupler U1 link to each other with 2 two input ends of operational amplifier respectively, operational amplifier 2 outputs are sent in the DSP digital signal processing module 3 that contains the number conversion function, contain number conversion function DSP digital signal processing module 3 and gather voltage V1.Temperature sensor 4 is close on the sampling resistor R1, the output pin of temperature sensor 4 with contain number conversion function DSP digital signal processing module 3 and be connected, the DSP digital signal processing module 3 that contains the number conversion function obtains the temperature T 1 of sampling resistor R1.The DSP digital signal processing module 3 that contains the number conversion function can obtain the accurate resistance of current sampling resistor R1 by the temperature T 1 of sampling resistor R1, current calculation unit 33 according to the voltage V1 that gathers by translation with amplify the virtual voltage that obtains on the sampling resistor R1, this virtual voltage has promptly obtained the accurate electric current through R1 divided by the accurate resistance of sampling resistor R1.
More than the current sampling circuit of a kind of Digital AC Servo Driver shown in Figure 1 be specific embodiment of the utility model; the utility model substantive distinguishing features and progress have been embodied; can be according to the use needs of reality; under enlightenment of the present utility model; it is carried out the equivalent modifications of aspects such as shape, structure, all at the row of the protection domain of this programme.
Claims (2)
1. the current sampling circuit of a Digital AC Servo Driver, comprise the sampling resistor that is used to detect electric machine phase current (R1), linear optocoupler (U1), operational amplifier (2), AD conversion unit (31) and the digital signal processor (3) that connect successively, it is characterized in that: the current calculation unit (33) that described digital signal processor (3) is provided with temperature compensation unit (32) and links to each other with temperature compensation unit (32); Described sampling resistor (R1) surface is provided with a temperature sensor (4), temperature sensor (4) links to each other with temperature compensation unit (32) through AD conversion unit (31), and temperature compensation unit (32) receives the resistance value of temperature signal compensating sampling resistance (R1) to eliminate the influence of temperature to the resistance of sampling resistor (R1); The information of voltage of sampling resistor (R1) links to each other with current calculation unit (33) by linear optocoupler (U1), operational amplifier (2) and AD conversion unit (31), and current calculation unit (33) calculates electric machine phase current according to the information of voltage of sampling resistor (R1) and the resistance value of the sampling resistor (R1) after the compensation.
2. the current sampling circuit of a kind of Digital AC Servo Driver according to claim 1 is characterized in that: described digital signal processor (3) is for being provided with the DSP digital signal processor (3) of AD conversion unit (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201432584U CN201654109U (en) | 2010-03-29 | 2010-03-29 | Current sampling circuit of fully-digital alternating current servo driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201432584U CN201654109U (en) | 2010-03-29 | 2010-03-29 | Current sampling circuit of fully-digital alternating current servo driver |
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| Publication Number | Publication Date |
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| CN201654109U true CN201654109U (en) | 2010-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010201432584U Expired - Lifetime CN201654109U (en) | 2010-03-29 | 2010-03-29 | Current sampling circuit of fully-digital alternating current servo driver |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611372A (en) * | 2012-03-09 | 2012-07-25 | 北京经纬恒润科技有限公司 | Method and system for acquiring feedback current of driver of stepping motor |
| CN102901865A (en) * | 2012-10-31 | 2013-01-30 | 北京经纬恒润科技有限公司 | Motor phase current detection circuit |
| CN111077356A (en) * | 2019-12-16 | 2020-04-28 | 广东格兰仕集团有限公司 | Current detection circuit, method, apparatus and storage medium |
| CN113156192A (en) * | 2021-02-26 | 2021-07-23 | 苏州优赛思电子科技有限公司 | Current sampling device of high-voltage system of new energy vehicle |
-
2010
- 2010-03-29 CN CN2010201432584U patent/CN201654109U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611372A (en) * | 2012-03-09 | 2012-07-25 | 北京经纬恒润科技有限公司 | Method and system for acquiring feedback current of driver of stepping motor |
| CN102611372B (en) * | 2012-03-09 | 2014-12-24 | 北京经纬恒润科技有限公司 | Method and system for acquiring feedback current of driver of stepping motor |
| CN102901865A (en) * | 2012-10-31 | 2013-01-30 | 北京经纬恒润科技有限公司 | Motor phase current detection circuit |
| CN111077356A (en) * | 2019-12-16 | 2020-04-28 | 广东格兰仕集团有限公司 | Current detection circuit, method, apparatus and storage medium |
| CN113156192A (en) * | 2021-02-26 | 2021-07-23 | 苏州优赛思电子科技有限公司 | Current sampling device of high-voltage system of new energy vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 312300 No. 1801 Renmin West Road, Shaoxing, Zhejiang, Shangyu Patentee after: Wolong Electric Drive Group Co., Ltd. Address before: 312300 No. 1801 Renmin West Road, Shaoxing, Zhejiang, Shangyu Patentee before: Wolong Electric Group Co., Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101124 |