CN2779415Y - DC bus voltage sampling circuit for full-digital AC servo drive system - Google Patents
DC bus voltage sampling circuit for full-digital AC servo drive system Download PDFInfo
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- CN2779415Y CN2779415Y CN 200520040297 CN200520040297U CN2779415Y CN 2779415 Y CN2779415 Y CN 2779415Y CN 200520040297 CN200520040297 CN 200520040297 CN 200520040297 U CN200520040297 U CN 200520040297U CN 2779415 Y CN2779415 Y CN 2779415Y
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Abstract
The utility model relates to a DC bus voltage sampling circuit of a full-digital AC servo drive system, which is composed of a sampling voltage resistor, a balancing resistor, a linear optical coupler, an operational amplification circuit and an analogue-digital conversion circuit, wherein the positive end of the primary stage of the linear optical coupler is connected with the sampling voltage resistor; the negative end of the primary stage of the linear optical coupler is connected with the balancing resistor; the secondary stage of the linear optical coupler is connected with the input end of the operational amplification circuit; the output end of the operational amplification circuit is connected with the input end of the analogue-digital conversion circuit; the output end of the analogue-digital conversion circuit is connected with a control circuit and can output digital signals to the control circuit; the control circuit can detect the voltage change of a DC bus at real time. The error value is made up by a control software, and the sampling voltage value of alarm can be adjusted. The utility model adopts the linear optical coupler, the DC bus is separated with the control circuit and the reliability of signal transmission can be ensured. The utility model is used for a full-digital AC servo drive system, and the reliability of productions can be enhanced.
Description
Technical field
The utility model relates to a kind of voltage sampling circuit that is used for dc bus, relates in particular to a kind of DC bus-bar voltage sample circuit of digital ac servo drive system.
Background technology
See also shown in Figure 1ly, at present, this forms the busbar voltage sample circuit of prior art by voltage comparator U2A, resistance R 1 and R2; The input end 4 of voltage comparator U2A and resistance R 1 are with R2's and connect end and be connected, the other end of resistance R 1 is connected with the P of DC bus-bar voltage end, the other end of resistance R is connected with DC bus-bar voltage N end, the input end 5 of voltage comparator U2A is connected with reference voltage V_REF, the output terminal 2 of voltage comparator U2A is connected output alarm signal with the external alert device.
The circuit theory of the DC bus-bar voltage sample circuit of prior art is, last resistance in series R1 of bus P, N and R2, voltage that obtains after dividing potential drop and reference voltage V_REF compare, if be higher than reference voltage then voltage comparator U2A send the over voltage alarm signal, the prompting busbar voltage too high safe handling scope that surpassed.Equally, busbar voltage is crossed to hang down and also should be sent the undervoltage warning signal.But undervoltage warning circuit and over voltage alarm circuit can't be compatible, so must design a cover and the basic the same undervoltage warning circuit of over voltage alarm circuit in addition again, just the resistance of R1, R2 and the magnitude of voltage of reference voltage V_REF changed.
The shortcoming of the DC bus-bar voltage sample circuit of prior art is:
1. this circuit can only produce specific switching signal, is not voltage sample truly.
2. this circuit is because there is allowable error in resistance, so the magnitude of voltage of sampling also has certain error; The voltage consistance of sampling is poor.
3. this circuit be if will adjust magnitude of voltage when reporting to the police, must change the resistance of resistance R 1, R2 or change the magnitude of voltage of reference voltage V_REF, and adjustability is poor.
Summary of the invention
The purpose of this utility model is to provide a kind of DC bus-bar voltage sample circuit of improved digital ac servo drive system, it can improve the reliability of transmission signals, can export the digital signal of sampled voltage, be convenient to the warning sample voltage value on control circuit detection in real time and the regulation and control dc bus.
The technical solution of the utility model is achieved in that a kind of DC bus-bar voltage sample circuit of digital ac servo drive system, is characterized in: this circuit comprises: sampling divider resistance, balance resistance, linear light lotus root, operational amplification circuit, analog to digital conversion circuit;
The elementary anode of described linear light lotus root is connected with the sampling divider resistance, and the elementary negative terminal of linear light lotus root is connected with balance resistance, and the input end of the secondary and operational amplification circuit of linear light lotus root is connected;
The output terminal of described operational amplification circuit is connected with the input end of analog to digital conversion circuit;
The output terminal output digital signal of described analog to digital conversion circuit.
The DC bus-bar voltage sample circuit of above-mentioned digital ac servo drive system, wherein, described sampling divider resistance is made up of resistance R 1 and R2; Resistance R 1 is with R2's and connect end and is connected with the elementary anode 2 of linear light lotus root, and the other end of resistance R 1 is held with the P of dc bus and is connected, and the other end of resistance R 2 is held with dc bus N and is connected.
The DC bus-bar voltage sample circuit of above-mentioned digital ac servo drive system, wherein, described balance resistance is made up of resistance R 3 and R4; Resistance R 3 is with R4's and connect end and is connected with the elementary negative terminal 3 of linear light lotus root, and the other end of resistance R 3 is held with the N of dc bus and is connected, and the other end of resistance R 4 is connected with the end 4 that dc bus N holds and the linear light lotus root is elementary.
The DC bus-bar voltage sample circuit of above-mentioned digital ac servo drive system, wherein, described operational amplification circuit is made up of operational amplifier U1, resistance R 5 to resistance R 8; The negative input end of described operational amplifier U1 and resistance R 5 and resistance R 8 and connect end and be connected, the secondary end 6 of the other end of resistance R 5 and linear light lotus root is connected, the other end of resistance R 8 is connected with the output terminal of operational amplifier U1, the positive input terminal of operational amplifier U1 and resistance R 6 and resistance R 7 and connect end and be connected, the secondary end 7 of the other end of resistance R 6 and linear light lotus root is connected, the other end of resistance R 7 is connected with GND, and the output terminal of operational amplifier U1 is connected with the input end of analog to digital conversion circuit.
The DC bus-bar voltage sample circuit of the digital ac servo drive system of stating the first half of the year, wherein, described analog to digital conversion circuit is to be made of analog to digital conversion AD chip; The output terminal output digital data transmission of this analog to digital conversion circuit is given external control circuit.
The DC bus-bar voltage sample circuit of the utility model digital ac servo drive system makes it compared with prior art owing to adopted above-mentioned technical scheme, has following advantage and good effect:
1. the utility model is owing to adopt linear light lotus root, transmission signals reliability height in circuit; Using the linear light lotus root to make has had isolation between forceful electric power on the dc bus and the light current on the control circuit, and the interference on the forceful electric power can not have influence on the control circuit, has improved reliability of products.
2. the utility model is owing to adopt the AD analog to digital conversion circuit in circuit, exportable digital signal,
Make external detection equipment can detect change in voltage on the dc bus in real time; Realized DC bus-bar voltage sampling truly.
3. the utility model is a digital signal owing to what export, can compensate when calculating by Control Software, remedies error amount; Make the high conformity of sampled voltage.
4. the magnitude of voltage when the utility model can be reported to the police by the modification adjustment of software parameter, adjustability is good.
Description of drawings
Embodiment by following DC bus-bar voltage sample circuit to the utility model digital ac servo drive system can further understand the purpose of this utility model, specific structural features and advantage in conjunction with the description of its accompanying drawing.Wherein, accompanying drawing is:
Fig. 1 is the circuit theory diagrams of the voltage sampling circuit of prior art dc bus.
Fig. 2 is the circuit theory diagrams of the DC bus-bar voltage sample circuit of the utility model digital ac servo drive system.
Embodiment
See also shown in Figure 2ly, the DC bus-bar voltage sample circuit of digital ac servo drive system comprises: sampling divider resistance 1, balance resistance 2, linear light lotus root 3, operational amplification circuit 4, analog to digital conversion circuit 5; Linear light lotus root 3 elementary anodes are connected with sampling divider resistance 1, and the elementary negative terminal of linear light lotus root 3 is connected with balance resistance 2, and the input end of the secondary and operational amplification circuit 4 of linear light lotus root 3 is connected; The output terminal of operational amplification circuit 4 is connected with the input end of analog to digital conversion circuit 5; The output terminal of analog to digital conversion circuit 5 is connected with external control circuit, and the output digital data transmission is given external control circuit.
In the present embodiment, sampling divider resistance 1 is made up of resistance R 1 and R2; Resistance R 1 is with R2's and connect the elementary anode 2 of end and linear light lotus root 3 and is connected, and the other end of resistance R 1 is held with the P of dc bus and is connected, and the other end of resistance R is held with dc bus N and is connected.
Linear light lotus root 3 is adopted linear photoconductor coupling apparatus PC1 (its product type is HCPL-7840).The end 1 of linear light lotus root 3 is connected with linear light lotus root primary source VN1, the end 4 of linear light lotus root 3 is connected with linear light lotus root primary source VNC, the end 8 of linear light lotus root 3 is connected with linear light lotus root secondary power (control circuit power supply)+VCC, and the end of linear light lotus root 3 is connected with linear light lotus root secondary power (control circuit power supply) GND.The elementary reception analog voltage signal to be measured of linear light lotus root, the voltage signal of secondary output pair of differential.Between input and the output is a kind of equivalent relation of linearity within the specific limits.
Analog to digital conversion circuit 5 adopts analog to digital conversion AD chip (its product type is MAX125CCAX).The output terminal output digital data transmission of analog to digital conversion circuit 5 is given external control circuit.
The principle of work of the DC bus-bar voltage sampling electricity of the utility model digital ac servo drive system is: resistance in series R1 and R2 on bus P, N obtain the voltage in the certain limit after dividing potential drop.R3, R4 are balance resistance, play the effect that makes the input circuit balanced, symmetrical, wherein R3=R1, R4=R2.The voltage that obtains after the dividing potential drop is sent into the elementary end 2 of linear light lotus root 3 as measured signal, the secondary end 6 of linear light lotus root 3,7 at end are exported a pair of differential voltage signal that is directly proportional with input voltage automatically, again through the single-ended analog voltage signal of operational amplification circuit 4 outputs, be converted to digital signal output supply control circuit through analog to digital conversion circuit 5, obtain actual voltage value by computed in software.The end 1 of the primary source of linear light lotus root 3, end 4 are provided by power supply Vn1, Vnc, and the end 5 of secondary power, end 8 are directly supplied with by control circuit power supply (+VCC, GND).After the resistance of sampling resistor R1, R2 is determined, the variation of DC bus-bar voltage causes the change in voltage of linear light lotus root 3 input ends 2, because the transmission line degree of linear light lotus root 3 is quite high, even primary electrical is pressed with the variation of millivolt level, the differential voltage of secondary output also can change thereupon.Therefore between the operational amplifier output voltage values as the output valve of detected d-c bus voltage value and linear light lotus root and back level relation has one to one been arranged, calculated corresponding actual voltage value by Control Software.
In sum, the utility model output sampled voltage digital signal makes control circuit can detect change in voltage on the dc bus in real time; And can when calculating, compensate by Control Software, remedy error amount; Make the high conformity of sampled voltage; Also can adjust the magnitude of voltage when reporting to the police; The utility model adopts the linear light lotus root in circuit, making has had isolation between forceful electric power on the dc bus and the light current on the control circuit, and the interference on the forceful electric power can not influence control circuit, and transmission signals is reliable, this circuit is used for the digital ac servo drive system, can improve reliability of products.
Claims (5)
1. the DC bus-bar voltage sample circuit of a digital ac servo drive system, it is characterized in that: this circuit comprises: sampling divider resistance, balance resistance, linear light lotus root, operational amplification circuit, analog to digital conversion circuit;
The elementary anode of described linear light lotus root is connected with the sampling divider resistance, and the elementary negative terminal of linear light lotus root is connected with balance resistance, and the input end of the secondary and operational amplification circuit of linear light lotus root is connected;
The output terminal of described operational amplification circuit is connected with the input end of analog to digital conversion circuit;
The output terminal output digital signal of described analog to digital conversion circuit.
2. the DC bus-bar voltage sample circuit of digital ac servo drive system according to claim 1 is characterized in that: described sampling divider resistance is made up of resistance R 1 and R2; Resistance R 1 is with R2's and connect end and is connected with the elementary anode 2 of linear light lotus root, and the other end of resistance R 1 is held with the P of dc bus and is connected, and the other end of resistance R 2 is held with dc bus N and is connected.
3. the DC bus-bar voltage sample circuit of digital ac servo drive system according to claim 1 is characterized in that: described balance resistance is made up of resistance R 3 and R4; Resistance R 3 is with R4's and connect end and is connected with the elementary negative terminal 3 of linear light lotus root, and the other end of resistance R 3 is held with the N of dc bus and is connected, and the other end of resistance R 4 is connected with the end 4 that dc bus N holds and the linear light lotus root is elementary.
4. the DC bus-bar voltage sample circuit of digital ac servo drive system according to claim 1 is characterized in that: described operational amplification circuit is made up of operational amplifier U1, resistance R 5 to resistance R 8; The negative input end of described operational amplifier U1 and resistance R 5 and resistance R 8 and connect end and be connected, the secondary end 6 of the other end of resistance R 5 and linear light lotus root is connected, the other end of resistance R 8 is connected with the output terminal of operational amplifier U1, the positive input terminal of operational amplifier U1 and resistance R 6 and resistance R 7 and connect end and be connected, the secondary end 7 of the other end of resistance R 6 and linear light lotus root is connected, the other end of resistance R 7 is connected with GND, and the output terminal of operational amplifier U1 is connected with the input end of analog to digital conversion circuit.
5. the DC bus-bar voltage sample circuit of digital ac servo drive system according to claim 1 is characterized in that: described analog to digital conversion circuit is to be made of analog to digital conversion AD chip; The output terminal output digital data transmission of this analog to digital conversion circuit is given external control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520040297 CN2779415Y (en) | 2005-03-22 | 2005-03-22 | DC bus voltage sampling circuit for full-digital AC servo drive system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520040297 CN2779415Y (en) | 2005-03-22 | 2005-03-22 | DC bus voltage sampling circuit for full-digital AC servo drive system |
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| CN2779415Y true CN2779415Y (en) | 2006-05-10 |
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| CN 200520040297 Expired - Lifetime CN2779415Y (en) | 2005-03-22 | 2005-03-22 | DC bus voltage sampling circuit for full-digital AC servo drive system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101685140A (en) * | 2008-09-24 | 2010-03-31 | 三科电器有限公司 | Accumulator routing inspection circuit |
| CN102647095A (en) * | 2011-02-17 | 2012-08-22 | 曲阜嘉信电气有限公司 | Method for reducing voltage of direct-current bus of frequency changer |
| CN102662095A (en) * | 2012-05-07 | 2012-09-12 | 无锡智卓电气有限公司 | Three-phase voltage sampling circuit |
| CN102680845A (en) * | 2012-05-04 | 2012-09-19 | 深圳市连硕设备技术有限公司 | Polarity determining device of direct plug-in type two-pin semiconductor |
| 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 |
| CN102998512A (en) * | 2012-10-30 | 2013-03-27 | 广东易事特电源股份有限公司 | Direct-current high-voltage isolation sampling circuit |
| CN105548656A (en) * | 2015-12-04 | 2016-05-04 | 珠海万力达电气自动化有限公司 | Direct current high voltage isolation sampling circuit |
| CN108828469A (en) * | 2018-06-28 | 2018-11-16 | 广州辰创科技发展有限公司 | A kind of street lamp fault diagnostic circuit and its diagnostic method |
| CN109254200A (en) * | 2018-11-16 | 2019-01-22 | 美钻深海能源科技研发（上海）有限公司 | For detecting the isolated DC voltage sensor of DC24V voltage stability |
| CN109375689A (en) * | 2018-09-26 | 2019-02-22 | 北京精密机电控制设备研究所 | A kind of current regulating circuit |
-
2005
- 2005-03-22 CN CN 200520040297 patent/CN2779415Y/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101685140A (en) * | 2008-09-24 | 2010-03-31 | 三科电器有限公司 | Accumulator routing inspection circuit |
| CN102647095A (en) * | 2011-02-17 | 2012-08-22 | 曲阜嘉信电气有限公司 | Method for reducing voltage of direct-current bus of frequency changer |
| CN102680845B (en) * | 2012-05-04 | 2014-11-26 | 深圳连硕自动化科技有限公司 | Polarity determining device of direct plug-in type two-pin semiconductor |
| CN102680845A (en) * | 2012-05-04 | 2012-09-19 | 深圳市连硕设备技术有限公司 | Polarity determining device of direct plug-in type two-pin semiconductor |
| CN102662095A (en) * | 2012-05-07 | 2012-09-12 | 无锡智卓电气有限公司 | Three-phase voltage sampling circuit |
| CN102998512A (en) * | 2012-10-30 | 2013-03-27 | 广东易事特电源股份有限公司 | Direct-current high-voltage isolation sampling circuit |
| CN102998512B (en) * | 2012-10-30 | 2015-08-19 | 广东易事特电源股份有限公司 | A kind of high direct voltage isolation sample circuit |
| 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 |
| CN105548656A (en) * | 2015-12-04 | 2016-05-04 | 珠海万力达电气自动化有限公司 | Direct current high voltage isolation sampling circuit |
| CN108828469A (en) * | 2018-06-28 | 2018-11-16 | 广州辰创科技发展有限公司 | A kind of street lamp fault diagnostic circuit and its diagnostic method |
| CN108828469B (en) * | 2018-06-28 | 2024-05-24 | 广州辰创科技发展有限公司 | Street lamp fault diagnosis circuit and diagnosis method thereof |
| CN109375689A (en) * | 2018-09-26 | 2019-02-22 | 北京精密机电控制设备研究所 | A kind of current regulating circuit |
| CN109254200A (en) * | 2018-11-16 | 2019-01-22 | 美钻深海能源科技研发（上海）有限公司 | For detecting the isolated DC voltage sensor of DC24V voltage stability |
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Expiration termination date: 20150322 Granted publication date: 20060510 |