CN201589812U - Servo system DC-bus voltage sampling circuit adopting voltage conversion frequency - Google Patents
Servo system DC-bus voltage sampling circuit adopting voltage conversion frequency Download PDFInfo
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- CN201589812U CN201589812U CN2009202978102U CN200920297810U CN201589812U CN 201589812 U CN201589812 U CN 201589812U CN 2009202978102 U CN2009202978102 U CN 2009202978102U CN 200920297810 U CN200920297810 U CN 200920297810U CN 201589812 U CN201589812 U CN 201589812U
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Abstract
The utility model relates to a servo system DC-bus voltage sampling circuit adopting voltage conversion frequency, which comprises a resistance sampling and dividing circuit, a V/F conversion circuit and a coupling isolation circuit, wherein the resistance sampling and dividing circuit is connected with a DC bus so as to obtain an input voltage Vin, and lead the Vin to be about 10V by means of voltage-division when a bus is in full voltage; the input end of the V/F conversion circuit is connected with the resistance sampling and dividing circuit so as to convert an input voltage value into a pulse frequency signal with frequency and voltage being directly proportional; and the primary positive end of the coupling isolation circuit is connected with the output end of the V/F conversion circuit, the secondary end of the coupling isolation circuit is connected with an I/O of a DSP so as to input the pulse signals with the same frequency into the DSP to obtain the corresponding digital value. The servo system DC-bus voltage sampling circuit has the advantages of having good input and output linearity, high reliability and high accuracy.
Description
Technical field
The utility model relates to a kind of servo-drive system DC bus-bar voltage sample circuit.
Background technology
On servo-drive system, the busbar voltage sample circuit (referring to Fig. 1) of prior art mainly is made up of sampling divider resistance, balance resistance, linear optical coupling, operational amplification circuit, analog to digital conversion circuit at present; The elementary anode of linear optical coupling is connected with the sampling divider resistance, and the elementary negative terminal of linear optical coupling is connected with balance resistance, and the input end of the secondary and operational amplification circuit of linear optical coupling is connected; The output terminal of analog to digital conversion circuit is connected with control circuit, and the output digital data transmission is given control circuit, makes control circuit can detect change in voltage on the dc bus.
The circuit theory of the DC bus-bar voltage sample circuit of prior art is, the last resistance in series R1 of bus P, N, R2, an analog voltage signal that after dividing potential drop, obtains, elementary input for linear optical coupling, the voltage signal of the secondary output pair of differential of linear optical coupling is a kind of equivalent relation of linearity within the specific limits between input and the output.The differential voltage signal of output obtains giving control circuit by A/D change-over circuit output digital signal behind the single-ended analog voltage signal through operational amplification circuit, obtains actual voltage value by computed in software.In sort circuit, linear optical coupling is a core devices of realizing voltage sample, and the linearity of linear optical coupling directly has influence on the accuracy of voltage sample.
The shortcoming of the DC bus-bar voltage sample circuit of prior art is:
1. employing linear optical coupling realize the ratio conversion of aanalogvoltage by linear optical coupling, and the range of linearity of linear optical coupling is little, input and output linear relatively poor, and vary with temperature bigger.
2. circuit is comparatively complicated, needs a lot of devices, as operational amplification circuit and A/D change-over circuit, thereby has reduced the reliability of sample circuit.
3. realize the conversion of analog voltage signal to digital quantity by the A/D conversion chip, its precision is subjected to the restriction of A/D conversion chip figure place, cannot improve its precision by the mode of software on original hardware foundation.
Summary of the invention
The utility model will solve existing servo-drive system DC bus-bar voltage sample circuit and have the problem that the input and output linearity is relatively poor, reliability is low, precision is low, provides the employing voltage that a kind of input and output linearity degree is good, reliability is high, precision is high to change the servo-drive system DC bus-bar voltage sample circuit of frequency.
The technical solution of the utility model:
Adopt voltage to change the servo-drive system DC bus-bar voltage sample circuit of frequency, it is characterized in that: comprise resistance sampling bleeder circuit, V/F change-over circuit, isolate photoelectric coupled circuit, described resistance sampling bleeder circuit is connected with dc bus, obtains input voltage V
In, make V by dividing potential drop
InWhen bus is completely pressed, be about 10v;
The input end of described V/F change-over circuit is connected with the resistance sampling bleeder circuit, and input voltage value is converted to frequency and the proportional pulse duration frequency signal of voltage;
The elementary anode of described isolation photoelectric coupled circuit is connected with V/F change-over circuit output terminal, and the I/O of the secondary and DSP of described isolation photoelectric coupled circuit is connected, and the pulse signal of same frequency is input to obtains corresponding digital quantity among the DSP.
Further, described resistance sampling bleeder circuit comprises the tenth resistance, the 11 resistance, described the tenth resistance and the 11 resistance and connect the end be connected with the input end of V/F change-over circuit, the other end of described the tenth resistance is connected with the VDC of dc bus end, and the other end of the 11 resistance is connected with the PG of dc bus end.
Further, described V/F change-over circuit comprises the V/F conversion chip, the 7th pin of described V/F conversion chip is connected with first electric capacity with first resistance, the other end of first resistance and the tenth resistance and the 11 resistance and connect end and be connected, an other end of first electric capacity is held with GND and is connected; The 6th pin of V/F conversion chip is connected with the 3rd electric capacity, and an other end of the 3rd electric capacity is connected with the GND end; First pin of V/F conversion chip is connected with the 3rd resistance, and an other end of the 3rd resistance is connected with the GND end; The 5th pin of V/F conversion chip is connected with second electric capacity with second resistance, and an other end of second resistance is connected with the VCC end, and an other end of second electric capacity is connected with the GND end; The 8th pin of V/F conversion chip is connected with the VCC end; The 4th pin of V/F conversion chip is connected with the GND end; Second pin of V/F conversion chip is connected with the 4th resistance, and an other end of the 4th resistance is connected with the GND end; The 3rd pin of V/F conversion chip is connected with the input end of the 5th resistance and optical coupling isolation circuit, and an other end of the 5th resistance is connected with VCC.
Further, described isolation photoelectric coupled circuit comprises the isolation optocoupler, isolates the elementary anode of optocoupler and is connected with the 3rd pin of the 6th resistance, the 4th electric capacity and V/F conversion chip, and an other end of the 6th resistance and the 4th electric capacity is connected with the GND end; Isolating the elementary negative terminal of optocoupler is connected with the GND end; Isolate the secondary anode of optocoupler and be connected with DSP with the 7th resistance, an other end of the 7th resistance is connected with the VCS end; Isolating the secondary negative terminal of optocoupler is connected with the SGND end; Isolating the optocoupler power end is connected with VCS.
Servomotor on the magnitude of voltage basis that the DC bus-bar voltage sampling obtains, by the expection of system to movement tendency, can realize predicting the pump liter by the utility model.When motor slows down or stops action and just will begin, open bleed-off circuit, in advance the pump liter.After need not waiting until that motor slows down or stops the action beginning, produce electric energy during regenerative braking and make DC bus-bar voltage rise to the pump liter to release after the threshold value, open bleed-off circuit again, reduce DC bus-bar voltage.The intelligent pump liter of precognition formula can prevent the uphill process of DC bus-bar voltage.The ratio of precision of the magnitude of voltage that collects in real time is higher, can improve the performance of whole servo-drive system with should value participating in the vector controlled computing.
Advantage of the present utility model and good effect:
1. can obtain good linear ratio relation between the output input, and be subjected to Temperature Influence smaller, bandwidth is very wide.
2. when the processes voltage analog quantity is converted to digital quantity, do not need practical A/D conversion chip, can be directly the frequency of its output mode by the software counting be obtained corresponding digital quantity, and its figure place is not subjected to the restriction of A/D conversion chip figure place, can obtains higher precision.
Summary the design of hardware circuit, simultaneously also can adjust undervoltage warning, over voltage alarm, voltage threshold when pump rises action by the modification of software parameter.
4. adopt high speed photo coupling to isolate, supply with simultaneously optocoupler elementary be pulse signal, the linearity of optocoupler is required very low, the buffer action that optocoupler only need play between dc bus circuit and the control circuit gets final product.
5. by the expection of system, can realize predicting the pump liter to movement tendency.
6. the ratio of precision of the magnitude of voltage that collects in real time is higher, can improve the performance of whole servo-drive system with should value participating in the vector controlled computing.
Description of drawings
Fig. 1 is the schematic diagram that prior art is used for the voltage sampling circuit of servo drive system dc bus.
Fig. 2 is circuit theory diagrams of the present utility model.
Fig. 3 is the theory diagram of the utility model V/F change-over circuit.
Embodiment
With reference to Fig. 1-3, adopt voltage to change the servo-drive system DC bus-bar voltage sample circuit of frequency, comprise resistance sampling bleeder circuit 1, V/F change-over circuit 2, isolate photoelectric coupled circuit 3, described resistance sampling bleeder circuit 1 is connected with dc bus, obtains input voltage V
In, make V by dividing potential drop
InWhen bus is completely pressed, be about 10v;
The input end of described V/F change-over circuit 2 is connected with resistance sampling bleeder circuit 1, and input voltage value is converted to frequency and the proportional pulse duration frequency signal of voltage;
The elementary anode of described isolation photoelectric coupled circuit 3 is connected with V/F change-over circuit 2 output terminals, and the I/O of the secondary and DSP of described isolation photoelectric coupled circuit 3 is connected, and the pulse signal of same frequency is input to obtains corresponding digital quantity among the DSP.
Described resistance sampling bleeder circuit 1 comprises the tenth resistance R the 10, the 11 resistance R 11, described the tenth resistance R 10 and the 11 resistance R 11 and connect the end be connected with the input end of V/F change-over circuit 2, the other end of described the tenth resistance R 10 is connected with the VDC of dc bus end, and the other end of the 11 resistance R 11 is connected with the PG of dc bus end.
Described V/F change-over circuit 2 comprises V/F conversion chip U1, the 7th pin of described V/F conversion chip U1 is connected with first capacitor C 1 with first resistance R 1, the other end of first resistance R 1 and the tenth resistance R 10 and the 11 resistance R 11 and connect end and be connected, an other end of first capacitor C 1 is held with GND and is connected; The 6th pin of V/F conversion chip U1 is connected with the 3rd capacitor C 3, and an other end of the 3rd capacitor C 3 is connected with the GND end; First pin of V/F conversion chip U1 is connected with the 3rd resistance R 3, and an other end of the 3rd resistance R 3 is connected with the GND end; The 5th pin of V/F conversion chip U1 is connected with second capacitor C 2 with second resistance R 2, and an other end of second resistance R 2 is connected with the VCC end, and an other end of second capacitor C 2 is connected with the GND end; The 8th pin of V/F conversion chip U1 is connected with the VCC end; The 4th pin of V/F conversion chip U1 is connected with the GND end; Second pin of V/F conversion chip U1 is connected with the 4th resistance R 4, and an other end of the 4th resistance R 4 is connected with the GND end; The 3rd pin of V/F conversion chip U1 is connected with the input end of the 5th resistance R 5 and optical coupling isolation circuit 3, and an other end of the 5th resistance R 5 is connected with VCC.
Described isolation photoelectric coupled circuit 3 comprises isolates optocoupler U2, isolates the elementary anode of optocoupler U2 and is connected with the 3rd pin of the 6th resistance R 6, the 4th capacitor C 4 and V/F conversion chip U1, and an other end of the 6th resistance R 6 and the 4th capacitor C 4 is connected with the GND end; Isolating the elementary negative terminal of optocoupler U2 is connected with the GND end; Isolate U2 level of optocoupler anode and be connected with DSP with the 7th resistance R 7, an other end of the 7th resistance R 7 is connected with the VCS end; Isolating U2 level of optocoupler negative terminal is connected with the SGND end; Isolating optocoupler U2 power end is connected with VCS.
Servomotor on the magnitude of voltage basis that the DC bus-bar voltage sampling obtains, by the expection of system to movement tendency, can realize predicting the pump liter by the utility model.When motor slows down or stops action and just will begin, open bleed-off circuit, in advance the pump liter.After need not waiting until that motor slows down or stops the action beginning, produce electric energy during regenerative braking and make DC bus-bar voltage rise to the pump liter to release after the threshold value, open bleed-off circuit again, reduce DC bus-bar voltage.The intelligent pump liter of precognition formula can prevent the uphill process of DC bus-bar voltage.The ratio of precision of the magnitude of voltage that collects in real time is higher, can improve the performance of whole servo-drive system with should value participating in the vector controlled computing.
The described content of this instructions embodiment only is enumerating the way of realization of utility model design; protection domain of the present utility model should not be regarded as only limiting to the concrete form that embodiment states, protection domain of the present utility model also reach in those skilled in the art according to the utility model design the equivalent technologies means that can expect.
Claims (4)
1. adopt voltage to change the servo-drive system DC bus-bar voltage sample circuit of frequency, it is characterized in that: comprise resistance sampling bleeder circuit, V/F change-over circuit, isolate photoelectric coupled circuit, described resistance sampling bleeder circuit is connected with dc bus, obtains input voltage V
In, make V by dividing potential drop
InWhen bus is completely pressed, be about 10v;
The input end of described V/F change-over circuit is connected with the resistance sampling bleeder circuit, and input voltage value is converted to frequency and the proportional pulse duration frequency signal of voltage;
The elementary anode of described isolation photoelectric coupled circuit is connected with V/F change-over circuit output terminal, and the I/O of the secondary and DSP of described isolation photoelectric coupled circuit is connected, and the pulse signal of same frequency is input to obtains corresponding digital quantity among the DSP.
2. employing voltage according to claim 1 changes the servo-drive system DC bus-bar voltage sample circuit of frequency, it is characterized in that: described resistance sampling bleeder circuit comprises the tenth resistance, the 11 resistance, described the tenth resistance and the 11 resistance and connect the end be connected with the input end of V/F change-over circuit, the other end of described the tenth resistance is connected with the VDC of dc bus end, and the other end of the 11 resistance is connected with the PG of dc bus end.
3. employing voltage according to claim 1 and 2 changes the servo-drive system DC bus-bar voltage sample circuit of frequency, it is characterized in that: described V/F change-over circuit comprises the V/F conversion chip, the 7th pin of described V/F conversion chip is connected with first electric capacity with first resistance, the other end of first resistance and the tenth resistance and the 11 resistance and connect end and be connected, an other end of first electric capacity is held with GND and is connected; The 6th pin of V/F conversion chip is connected with the 3rd electric capacity, and an other end of the 3rd electric capacity is connected with the GND end; First pin of V/F conversion chip is connected with the 3rd resistance, and an other end of the 3rd resistance is connected with the GND end; The 5th pin of V/F conversion chip is connected with second electric capacity with second resistance, and an other end of second resistance is connected with the VCC end, and an other end of second electric capacity is connected with the GND end; The 8th pin of V/F conversion chip is connected with the VCC end; The 4th pin of V/F conversion chip is connected with the GND end; Second pin of V/F conversion chip is connected with the 4th resistance, and an other end of the 4th resistance is connected with the GND end; The 3rd pin of V/F conversion chip is connected with the input end of the 5th resistance and optical coupling isolation circuit, and an other end of the 5th resistance is connected with VCC.
4. employing voltage according to claim 3 changes the servo-drive system DC bus-bar voltage sample circuit of frequency, it is characterized in that: described isolation photoelectric coupled circuit comprises the isolation optocoupler, isolate the elementary anode of optocoupler and be connected with the 3rd pin of the 6th resistance, the 4th electric capacity and V/F conversion chip, an other end of the 6th resistance and the 4th electric capacity is connected with the GND end; Isolating the elementary negative terminal of optocoupler is connected with the GND end; Isolate the secondary anode of optocoupler and be connected with DSP with the 7th resistance, an other end of the 7th resistance is connected with the VCS end; Isolating the secondary negative terminal of optocoupler is connected with the SGND end; Isolating the optocoupler power end is connected with VCS.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202978102U CN201589812U (en) | 2009-12-12 | 2009-12-12 | Servo system DC-bus voltage sampling circuit adopting voltage conversion frequency |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202978102U CN201589812U (en) | 2009-12-12 | 2009-12-12 | Servo system DC-bus voltage sampling circuit adopting voltage conversion frequency |
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| CN201589812U true CN201589812U (en) | 2010-09-22 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841246A (en) * | 2012-08-31 | 2012-12-26 | 长城汽车股份有限公司 | High-precision voltage measuring circuit |
| CN105092933A (en) * | 2015-06-03 | 2015-11-25 | 大连市旅顺电力电子设备有限公司 | Direct switch type online voltage monitoring apparatus for storage battery and method thereof |
| CN105092954A (en) * | 2015-06-03 | 2015-11-25 | 大连市旅顺电力电子设备有限公司 | Novel online voltage monitoring apparatus for storage battery and method thereof |
| CN105486916A (en) * | 2015-11-16 | 2016-04-13 | 国家电网公司 | Direct current signal acquisition circuit facing intelligent transformer station |
| CN113114211A (en) * | 2021-04-26 | 2021-07-13 | 石家庄通合电子科技股份有限公司 | Voltage-frequency conversion circuit and sensor |
-
2009
- 2009-12-12 CN CN2009202978102U patent/CN201589812U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841246A (en) * | 2012-08-31 | 2012-12-26 | 长城汽车股份有限公司 | High-precision voltage measuring circuit |
| CN105092933A (en) * | 2015-06-03 | 2015-11-25 | 大连市旅顺电力电子设备有限公司 | Direct switch type online voltage monitoring apparatus for storage battery and method thereof |
| CN105092954A (en) * | 2015-06-03 | 2015-11-25 | 大连市旅顺电力电子设备有限公司 | Novel online voltage monitoring apparatus for storage battery and method thereof |
| CN105092954B (en) * | 2015-06-03 | 2017-12-08 | 大连市旅顺电力电子设备有限公司 | New on-Line Voltage monitoring device and its method for batteries |
| CN105092933B (en) * | 2015-06-03 | 2017-12-12 | 大连市旅顺电力电子设备有限公司 | Direct transform on-Line Voltage monitoring device and its method for batteries |
| CN105486916A (en) * | 2015-11-16 | 2016-04-13 | 国家电网公司 | Direct current signal acquisition circuit facing intelligent transformer station |
| CN105486916B (en) * | 2015-11-16 | 2018-06-01 | 国家电网公司 | A kind of direct-current signal acquisition circuit towards intelligent substation |
| CN113114211A (en) * | 2021-04-26 | 2021-07-13 | 石家庄通合电子科技股份有限公司 | Voltage-frequency conversion circuit and sensor |
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Granted publication date: 20100922 |