CN100471027C - Electric circuit for driving motor - Google Patents
Electric circuit for driving motor Download PDFInfo
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- CN100471027C CN100471027C CNB2004100201346A CN200410020134A CN100471027C CN 100471027 C CN100471027 C CN 100471027C CN B2004100201346 A CNB2004100201346 A CN B2004100201346A CN 200410020134 A CN200410020134 A CN 200410020134A CN 100471027 C CN100471027 C CN 100471027C
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Abstract
The disclosed circuit includes following parts: power source detection part in use for detecting voltage between lines of three phases AC power source; estimation part for estimating DC voltage based on voltage value detected by the said power source detection part, and current value of motor detected by the current detection part. Under insulating state between DC connection end and AC power source, the disclosed circuit can estimate position and speed of rotor of motor through estimated voltage and current of motor from DC connection end. Ensuring stability of circuit for driving motor, the invention raises accuracy and stability of estimation, detection and control.
Description
Technical field
The present invention relates to a kind of motor-drive circuit (Motor Drive); As the motor-drive circuit that uses 3 cross streams power supplys, motor-drive circuit of the present invention is by the power supply test section of voltage between line that detects 3 cross streams power supplys and the line, according to the magnitude of voltage of power supply test section detection and the motor current value of current detecting part detection, and the dc voltage portion of inferring of inferring dc voltage forms.Thereby, do not have the burden on the price, and be between DC link and the AC power under the state of insulation, also can infer DC link voltage, can realize calculating detecting and control.
Background technology
Usually the structure of compressor etc. can not be provided with transducer, or increases degradation reason under expense or the confidence level when transducer is set, and adopts the reckoning detection mode usually as the motor rotor position detection mode during drive motors.
As follows with the method for calculating detection mode detection motor rotor position.By detecting DC link voltage and the electric current that flows through motor, estimated position.Measure by the resistance distribution when detecting DC link voltage, and above-mentioned current of electric is by mensuration such as current sensors.
Below, with reference to Fig. 1, foregoing is elaborated.
Be used to control motor and calculate that the motor-drive circuit that detects is made up of AC power portion 11, rectification part 12, DC link 13, inverter 14, Switching Power Supply 16, control part 17 usually.AC power portion 11 power supplies.Rectification part 12 above-mentioned AC rectification after, provide DC power supply to the DC link.DC link 13 is made up of several electric capacity, provides DC power supply to inverter 14.Inverter 14 inserts DC power supply, drive motors 15 from above-mentioned DC link 13.Switching Power Supply 16 inserts DC power supply from above-mentioned DC link 13, exports the specified control power supply of each IC.Control part 17 presumptive dc voltage values and the electric current that flows through motor to motor speed and rotor-position, are inferred, and are controlled above-mentioned inverter 14.
Use in the existing motor-drive circuit of single phase alternating current power supply, resistance dispenser 18 detects the voltage of DC link, and utilizes current detecting part 19 to detect the electric current that flows into motor.Above-mentioned current detecting part 19 is made up of current sensor etc.19 signals relevant with measured value of above-mentioned resistance dispenser 18 and current detecting part output to control part 17, allow control part 17 infer the speed of rotor and position etc., thereby the reckoning that can carry out motor detects control action.
When but the power of motor-drive circuit is big, use 3 cross streams power supplys usually, and in this case, can not distribute by resistance and detect dc voltage.Below, with reference to Fig. 2, the above-mentioned prior art relevant with 3 cross streams power supplys described.
Use in the motor-drive circuit of 3 cross streams power supplys, a certain phase and center line by 3 phase power supplys obtain single phase alternating current power supply, and obtain Vdc1 by unidirectional rectification part 30.Then above-mentioned Vdc1 is the input power supply, Switching Power Supply 26 is exported specified control power supply to each IC.But, when using 3 cross streams power supplys, because the consideration on the safety can not be connected (common) to the ground wire of the negative pole of DC link 23 and the specified control power supply of the output of Switching Power Supply 26.Therefore can't utilize resistance to distribute and detect the dc voltage value.
Thereby, under the situation that does not detect dc voltage, calculate and detect control.At this moment, be subjected to DC link capacitance or flow through the electric current of motor and the influence of AC power etc., DC link voltage changes.When above-mentioned voltage changed, the reckoning accuracy to motor rotor position of control part 27 can descend, and motor is calculated that the stability and the performance that detect control produce baneful influence.
Summary of the invention
The present invention proposes in order to address the above problem, its purpose is for providing a kind of motor-drive circuit, keep the state of insulation between DC link and the control mains side, and utilize DC to connect the distolateral electric current of inferring magnitude of voltage and motor, infer the position of rotor, when guaranteeing motor-drive circuit stability, improve and calculate accuracy and the stability that detects control.
In order to achieve the above object, a kind of motor-drive circuit of the present invention, form by rectification part, DC link, inverter portion, current detecting part, control part, Switching Power Supply, the dc voltage portion of inferring, rectification part is used 3 cross streams power supplys, and behind the power rectifier to DC link supplying DC power source, the DC link is to inverter portion supplying DC power source.Inverter portion inserts DC power supply from the DC link, drive motors, and current detecting part detects the electric current of inverter portion output, and control part is measured the state of motor according to the electric current of current detecting part detection, and controls inverter portion with this.Switching Power Supply inserts DC power supply from the DC link, provide specified control power supply to each IC, dc voltage is inferred portion in order to infer the rotor-position of motor exactly, presumed value signal to above-mentioned control part output dc voltage, the current value that dc voltage presumed value that this control part is inferred according to the dc voltage portion of inferring and current detecting part detect, control inverter portion.
As a kind of improvement of motor-drive circuit of the present invention, this dc voltage is inferred portion according to the line of 3 cross streams power supplys of power supply test section detection and the current value of magnitude of voltage between the line and current detecting part detection, infers dc voltage.
Motor-drive circuit of the present invention is being between DC link and the AC power under the state of insulation, can be by the DC link infer voltage and current of electric, calculate the position and the rotating speed of rotor, improve when can guarantee motor-drive circuit stability and calculate accuracy and the stability that detects control.
Description of drawings
The motor-drive circuit circuit diagram of Fig. 1 when connecting general individual event AC power;
Fig. 2 is when connecting 3 cross streams electricity, the circuit diagram of conventional motors drive circuit;
Fig. 3 has the motor-drive circuit circuit diagram that dc voltage of the present invention is inferred portion;
Fig. 4 for motor-drive circuit with the current related DC link voltage that turns on motor;
Fig. 5 is the DC link voltage relevant with motor-drive circuit alternating voltage and current of electric;
Fig. 6 is a motor-drive circuit power supply test section circuit diagram of the present invention.
The critical piece description of reference numerals
33:DC link 39: current sense portion
40: power supply test section 41:DC terminal voltage is inferred portion
Embodiment
Below, with reference to accompanying drawing, embodiments of the invention are elaborated.
As shown in Figure 3, motor-drive circuit of the present invention is inferred portion 41 by rectification part 32, DC link 33, inverter portion 34, current detecting part 39, control part 37, Switching Power Supply 36, power supply test section 40, dc voltage and is formed.Rectification part 32 is used 3 cross streams power supplys 31, and after above-mentioned AC power 31 rectifications to DC link 33 supplying DC power sources.DC link 33 is to inverter 34 supplying DC power sources.Inverter portion 34 inserts DC power supply, drive motors from above-mentioned DC link 33.The electric current of the above-mentioned inverter of current detecting part 39 detections portion 34 outputs.Control part 37 is measured the state of motor according to the electric current that current detecting part 39 detects, and controls inverter 34 with this.Switching Power Supply 36 inserts DC power supply from above-mentioned DC link 33, provides specified control power supply to each IC.Power supply test section 40 detects the line of 3 cross streams power supplys 31 and the voltage between the line.Dc voltage is inferred portion 41 in order to infer the rotor-position of motor exactly, to the presumed value signal of above-mentioned control part 37 output dc voltages.
Infer in the portion 41 at above-mentioned dc voltage, the electric current of the inflow motor that AC power that detects according to power supply test section 40 and current detecting part 39 detect is inferred dc voltage.Above-mentioned dc voltage is inferred portion 41 and is had the dc voltage that draws by experiment table look-up (look-up table).Dc voltage is inferred portion 41 and is tabled look-up according to above-mentioned, infers out and the ac voltage and the corresponding dc voltage of current value that detect, and corresponding signal is outputed to control part 37.
Below, with reference to Fig. 4, Fig. 5, the relation between the AC power in table look-up (look-up table), current of electric, the dc voltage is elaborated.
DC link voltage when Fig. 4 is electric capacity when charging of DC link 33 and discharge, and the DC link voltage relationship schematic diagram of current of electric when increasing.
Vmax is a DC link maximum voltage value among Fig. 4, and Vmin is a DC link minimum voltage value.
The T1 section is the section of electric capacity charging, and the Vmax value is an input ac power RMS value
Doubly.The T2 section is the section of capacitor discharge, if current of electric is 0, then dc voltage at this moment is identical with the Vmax value, if current of electric increases, then dc voltage can reduce to Vmin from Vmax.Here, the capacity of electric capacity is more little, above-mentioned underspeed fast more.Dc voltage refers to the average voltage of DC link voltage.When this means AC power value and motor current value change, DC link magnitude of voltage also can change.
Fig. 5 is alternating voltage and current of electric and DC link voltage relationship schematic diagram.
As shown in Figure 5, along with alternating voltage and current of electric change, dc voltage is also changing.As an example, Vdc1 is the dc voltage waveform of alternating voltage when being 380V of input, and Vdc2 is the dc voltage waveform of the alternating voltage of input when being 360V, and Vdc3 is the dc voltage waveform of the alternating voltage of input when being 400V.Shown in above-mentioned waveform, along with AC power raises, reduces, the curve of dc voltage also can raise, reduce.In addition, transverse axis is represented motor current value.As shown in the figure, when motor current value raise, the dc voltage value descended.
As Fig. 4, shown in Figure 5, dc voltage changes along with the size of input ac power and current of electric.Drawing by experiment after the above-mentioned relation Value Data, can be above-mentioned data software programming dc voltage table look-up (look-up table).Above-mentioned dc voltage is inferred portion 41, receive AC power value that detects by above-mentioned power supply test section 40 and the motor current value that detects by above-mentioned current detecting part 39, and utilize above-mentioned value, and table look-up (look-up table) according to the dc voltage that draws by experiment, infer the dc voltage value.Dc voltage is inferred portion 41 above-mentioned dc voltage value of inferring, and outputs to control part 37 by corresponding signal.Thereby control part 37 is under the state of insulation between DC link 33 and AC power 31, also can infer out the position and the rotating speed of rotor exactly.
Fig. 6 is a motor-drive circuit power supply test section circuit diagram of the present invention.
Power supply test section 50 is made up of step-down portion 52, rectification part 53, filtering portion 54, resistance dispenser 55.Step-down portion 52 carries out step-down by transformer to the voltage between 2 phases of 3 cross streams power supplys 51.Rectification part 53 is the voltage after the step-down, carries out output dc voltage after the rectification.Filtering portion 54 carries out filtering by the direct voltage of electric capacity after to above-mentioned rectification.Resistance dispenser 55 is carried out step-down once more to filtered voltage.By the way, voltage drop is pressed into the voltage that is complementary with control part such as microprocessor, and to output of the dc voltage portion of inferring and AC power correspondent voltage Vdc.
The present invention has following another embodiment.
The relation of the alternating voltage of above-mentioned Fig. 5 and current of electric and DC link magnitude of voltage is the curve that draws according to experimental data.This is, with the relation of above-mentioned alternating voltage and current of electric and dc voltage, form table look-up (look-up table) after, dc voltage is inferred portion 41 can utilize that changing tables look-up infers dc voltage.
Here,, convert approximate formula to, rather than form and table look-up experimental data.Thereby can be updated to above-mentioned formula to the magnitude of voltage and the current value of above-mentioned power supply test section 40 and current detecting part 39 detections, infer DC link voltage.Have function same as the previously described embodiments thereby can allow dc voltage infer portion 41, and obtain having the motor-drive circuit that above-mentioned dc voltage is inferred portion 41.
Claims (4)
1, a kind of motor-drive circuit, comprise rectification part, the DC link, inverter portion, current detecting part, control part, Switching Power Supply, dc voltage is inferred portion, rectification part is used 3 cross streams power supplys, and behind the power rectifier to DC link supplying DC power source, the DC link is to inverter portion supplying DC power source, inverter portion inserts DC power supply from the DC link, drive motors, current detecting part detects the electric current of inverter portion output, the electric current that control part detects according to current detecting part, measure the state of motor, and control inverter portion with this, Switching Power Supply inserts DC power supply from the DC link, provide specified control power supply to each IC, dc voltage is inferred portion in order to infer the rotor-position of motor exactly, to the presumed value signal of control part output dc voltage, it is characterized in that: the dc voltage presumed value that described control part is inferred according to the dc voltage portion of inferring, and the current value of current detecting part detection, control inverter portion.
2, motor-drive circuit according to claim 1 is characterized in that: described dc voltage is inferred portion according to the line of 3 cross streams power supplys of power supply test section detection and the current value of magnitude of voltage between the line and current detecting part detection, infers dc voltage.
3, motor-drive circuit according to claim 2, it is characterized in that: draw dc voltage and the corresponding relation data of input ac power and current of electric by experiment, and be the data software programming that dc voltage is tabled look-up, described dc voltage is inferred portion, the line of the 3 cross streams power supplys that detect according to the power supply test section and the magnitude of voltage between the line and the motor current value that detects by current detecting part, utilization is tabled look-up, and infers the dc voltage value.
4, motor-drive circuit according to claim 2, it is characterized in that: draw dc voltage and the corresponding relation data of input ac power and current of electric by experiment, and experimental data converted to approximate formula, described dc voltage is inferred portion, the line of the 3 cross streams power supplys that the power supply test section is detected and the magnitude of voltage between the line and the motor current value that detects by current detecting part, be updated to formula, infer dc voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100201346A CN100471027C (en) | 2004-07-26 | 2004-07-26 | Electric circuit for driving motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100201346A CN100471027C (en) | 2004-07-26 | 2004-07-26 | Electric circuit for driving motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1728537A CN1728537A (en) | 2006-02-01 |
| CN100471027C true CN100471027C (en) | 2009-03-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100201346A Expired - Fee Related CN100471027C (en) | 2004-07-26 | 2004-07-26 | Electric circuit for driving motor |
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| CN (1) | CN100471027C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101964618B (en) * | 2009-07-22 | 2012-09-05 | 海洋王照明科技股份有限公司 | Anti-jamming motor drive circuit |
| JP5549942B2 (en) * | 2011-12-28 | 2014-07-16 | Ｔｄｋ株式会社 | DCDC converter |
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2004
- 2004-07-26 CN CNB2004100201346A patent/CN100471027C/en not_active Expired - Fee Related
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| CN1728537A (en) | 2006-02-01 |
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