CN106452220A - Method for time-discrete control of electronically commutated electric motor - Google Patents
Method for time-discrete control of electronically commutated electric motor Download PDFInfo
- Publication number
- CN106452220A CN106452220A CN201610625729.7A CN201610625729A CN106452220A CN 106452220 A CN106452220 A CN 106452220A CN 201610625729 A CN201610625729 A CN 201610625729A CN 106452220 A CN106452220 A CN 106452220A
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- control
- frequency
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- time
- modulating frequency
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/0003—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/10—Arrangements for controlling torque ripple, e.g. providing reduced torque ripple
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/08—Arrangements for controlling the speed or torque of a single motor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
Abstract
The invention relates to a method for time-discrete control of an electronically commutated electric motor. In the method for the time-discrete control of the electronically commutated electric motor, in particular of an electric-driven motor of a motor vehicle, by means of a time-discrete modulation method, at least one control variable is initially detected, and then at least one regulation variable is formed, wherein the control frequency and the modulation frequency are separately set to improve the method.
Description
Technical field
The present invention relates to a kind of control electronic commutation by means of time-discrete modulator approach in time discrete mode
The method of the electric drive motor of (elektronisch kommutiert) motor, especially motor vehicles.
Background technology
From DE 10 2,011 086 583 A1 known a kind of for checking the commutation quality of the motor of electronic commutation
Method, this motor is the motor in hydraulic operating system in the drive system of motor vehicles, especially friction clutch,
This motor has multiple phase, and this motor has rotor, and the anglec of rotation of this rotor is by the rotor-position for absolute measurement
Sensor monitors, and wherein motor is independently controlled with by the anglec of rotation detected by rotor-position sensor, wherein
Rotor actual the anglec of rotation of process determined by rotor-position sensor, and then by the anglec of rotation of actual process with
The rotation angle having opened the default anglec of rotation compares, wherein when the anglec of rotation of actual process is in rotation angle, and electricity
Motivation provides enough commutation qualities.
Content of the invention
The present invention is based on following purpose：Improve and start described method.
Described purpose realizes by the following method, and described method carrys out time discrete by means of time-discrete modulator approach
The electric drive motor of the motor of ground control electronic commutation, especially motor vehicles, it is characterised in that control frequency and modulating frequency
Set apart from each other.
Described method may be used for controlling the commutation of motor.Motor can be syncmotor.Motor may be used for
Drive motor vehicles.Motor vehicles can be electric vehicle.Motor vehicles can be motor vehicle driven by mixed power.Motor can be nothing
Brush d.c. motor.Motor may be used for driving hydrostatic clutch actuator.Clutch actuator may be used for handling friction
Clutch.Friction clutch may be used for being arranged in the PWTN of motor vehicles.Motor may be used for driving electromechanics
The actuator of side-sway eliminator.Motor may be used for driving transmission actuator.Motor can have rotor.Rotor
Can have at least one permanent magnet.Motor can have stator.Stator can have coil.Coil can be with the side of electronics
Formula controls with staggering in time, in order to forming rotating field, described rotating field causes torque on the rotor of permanent excitation.Electronic
Machine can operationally synchronously rotate with alternating voltage.Motor can have extremely right.The rotating speed of motor can be via pole
Logarithm and the frequency association of alternating voltage.Current transformer may be used to motor commutation.Motor can be by means of field orientation
Control commutates.Motor can commutate by means of space vector modulation.Space vector modulation can be by means of microcontroller
Or digital signal processor realizes.Space vector modulation can realize based on software and/or based on hardware.Space vector
Modulation is determined for impulse waveform.
In order to control, at least one control process can be performed.At least one control process described can have one or
Multiple measurements and/or rate-determining steps.Multiple measurement of control process and/or rate-determining steps or all measurements and/or control step
Rapid order is properly termed as measurement or control task.At least one control process described can repeat with the cycle in whole or in part
Mode perform.The control that the time step that time-discrete control can be by mean of following successively is carried out.Time step
The predetermined duration can be respectively provided with.Time step can be respectively provided with the identical duration.Control process is held
Row can terminate within a time step.Execution to control process can continue multiple time step.Control frequency is said
Bright：How fast perform the control process followed successively.
In order to control, at least one controlled quentity controlled variable can be detected.Controlled quentity controlled variable can detect by means of measuring cell.Controlled quentity controlled variable
It is referred to as actual value.Controlled quentity controlled variable can be phase current.Controlled quentity controlled variable can be rotor-position.Controlled quentity controlled variable can be with at least one
Reference quantity compares.Reference quantity is referred to as desired value.At least one control difference can be determined.Control difference can be controlled quentity controlled variable
And the difference between reference quantity.Control difference can be fed at least one controller.Controller can form at least one regulation
Amount.Regulated quantity can be fed at least one control section.Control section can be worked by least one interference volume.Control can be used
In by control difference minimum.
Modulator approach may be used to motor commutation.Modulator approach can be pulse width modulation method or based on pulsewidth modulation
Method.Time-discrete modulator approach can be by mean of the modulator approach of the time step followed successively.Time step can be divided
Not there is the predetermined duration.Time step can be respectively provided with the identical duration.Modulating frequency explanation：During with which kind of
Clock frequency rate performs modulator approach.Can be with modulation duty cycle in modulating frequency.Rectangular pulse can be modulated in modulating frequency
Dutycycle.Modulation can produce impulse waveform.
Modulator approach can be space vector modulating method.Space vector of voltage may be used for the flux density in motor
The predetermined orientation of distribution.Space vector can have two variablees, i.e. angle and amplitude or real part and imaginary part.Voltage space
Vector can be zero voltage space vector.Space vector of voltage can to follow successively to be repeated cyclically in the way of apply.
Modulating frequency can arbitrarily be variably set.Control frequency can arbitrarily be variably set.Modulating frequency can
It is set to any multiple and/or the fraction of control frequency with becoming.
Modulating frequency can improve relative to control frequency.Control frequency can keep constant.Modulating frequency can be arranged
For controlling the twice of frequency.Modulating frequency for example can bring up to 20kHz from 10kHz.Control frequency for example can remain
10kHz.
Electric current can be measured by means of modulating frequency.Rotor-position can be measured by means of modulating frequency.Electric current can
With measurement in zero vector.Rotor-position can be measured in zero vector.
Electric current control task can perform by means of control frequency.Space vector modulation can be come by means of control frequency
Perform.Therefore ensure that in accordance with the operation time.
Space vector modulation can perform twice within a time step.Thus not only for future time step-length
And may determine that impulse waveform for time step following closely.Thus can reduce electric current and/or torque ripple.Electricity frequency
Can be enhanced.According to the space vector modulation performing twice, two impulse waveforms subsequently can be calculated.Second space vector
The rotor-position of modulation can determine according to the motor model being later used to calculate.
Modulating frequency can reduce relative to control frequency.Modulating frequency for example can be stopped in starting, ramp starting, ramp
Car (Berg-Halt) or block up deceleration (Stau-Kriechen) when reduce.Control frequency can keep constant.
Impulse waveform is may determine that in control task.Impulse wave can be determined at least one time step subsequently
Shape.Impulse waveform can be adjusted.At time point t0The impulse waveform applying can be at time point t1According in control task more
New data change.
In order to determine impulse waveform, it is possible to use the viewer of control technology.In control task, impulse waveform is for extremely
A few time step subsequently is determined.Impulse waveform can be determined for multiple time steps subsequently.Impulse waveform
Determination can suspend.The determination of impulse waveform can continue multiple time step.
Modulating frequency and/or control frequency can change off-line.Modulating frequency and/or control frequency can run into
Change during row.Modulating frequency and/or control frequency can change, in order to optimize efficiency.Modulating frequency and/or control frequency are permissible
Change, in order to reduce loss, especially reduce the loss being caused by electronic installation and/or motor.Modulating frequency and/or control frequency
Can change, in order to improve rotating speed and/or improve control dynamic range.
Generally speaking and in other words, especially draw from there through the present invention at control dynamic range and control product
The design of the motor control carrying out by means of variable PWM frequency in the case that quality guarantee is held constant.
Maximum electric frequency can be enhanced (high PWM frequency) in the case that torque ripple is little.PWM clock frequency can
To bring up to 20kHz or higher (doubling).Similarly, electric current can be measured in zero vector with 20kHz or bigger frequency
And rotor-position.Electric current control task and space vector modulation can work in addition in the task of 10kHz.Space vector is adjusted
System can be called twice, in order to interrupts not only for next PWM and determines impulse waveform for interruption following closely.By
This can by higher frequency reduce electric current/torque ripple and thus described system also can control and have more than 1kHz's
The system of electricity frequency.
Loss power in rotating speed hour can be reduced (relatively low PWM in the case of maintaining controller dynamic range
Frequency).In order to reduce the switching loss of electronic installation, meeting favourable in specific operating point is, reduces PWM frequency.For example：
Starting, ramp starting, parking on ramp, deceleration of blocking up.In control task, impulse waveform can be determined for next cycle,
The control cycle subsequently can adjust impulse waveform according to new information state.Also can meaningfully use with regard to sight at this
Examine the prediction of model, to have set PWM waveform for ensuing interval.It is to say, controller task has calculated
PWM waveform for following x step, in order to be then able to suspend.The operation time of controller task can be persistently multiple
Cycle.
Control and clock frequency can set adaptively when operation is carried out.Scheduling could be arranged to so that pin
To controller task and PWM task call and frequency can the change when operation is carried out independently.Set forth above
These improvement thus can be called as required.Therefore always can be with the optimal parameter line of efficiency on a driving pattern
Sail.Loss is obviously reduced, the loss especially being caused by electronic installation and motor.Rotating speed and control dynamic range are enhanced.
PWM frequency can be variably set.Control frequency can be variably set.PWM frequency can be variably set for
Any multiple/fraction of control frequency.Electricity running frequency can be widened more than in the scope of 1kHz.Each task can be independent
Call and to each other without constraint.The frequency called can change with regard to the operation time.Switching loss can be reduced.
With " can " especially represent the present invention selectable feature.Therefore, always there is the below embodiment of the present invention, institute
State embodiment and there is a corresponding feature or multiple corresponding feature.
Improve changeability by the present invention.Realize the raising of the maximum running speed of motor.Even if in the high feelings of rotating speed
Also time enough can be provided under condition to form regulated quantity.The switching loss of current transformer reduces.The torque ripple of motor
Rising is reduced.Control dynamic range is improved.Goal conflict between loss power, maximum (top) speed and control dynamic range
Relaxed.
Brief description
Describe embodiments of the invention with reference next to accompanying drawing in detail.Other feature and advantage are drawn from this description.
The specific features of these embodiments generally speaking can be as inventive feature.Being associated with further feature of these embodiments
Feature also can be as the independent feature of the present invention.
Accompanying drawing schematically and is exemplarily illustrated：
Fig. 1 illustrates the Field orientable control carrying out with the motor to electronic commutation for the modulating frequency, wherein said modulation frequency
Rate improves relative to control frequency, and described motor runs by means of space vector modulation, and
Fig. 2 illustrates the Field orientable control carrying out with the motor to electronic commutation for the modulating frequency, wherein said modulation frequency
Rate reduces relative to control frequency, and described motor runs by means of space vector modulation.
Detailed description of the invention
Fig. 1 illustrates the Field orientable control carrying out with the motor to electronic commutation for the modulating frequency, wherein said modulation frequency
Rate improves relative to control frequency, and described motor runs by means of space vector modulation.
Show the sequential with time step 102 in FIG with curve Figure 100.Time step 102 is respectively provided with identical
Duration and start in the way of one by one periodically.Very first time step-length 102 is at time point t0Start, after
Continuous time step is respectively with relative to time point t0+nThe end of preceding time step and start.Control process 104 includes many
Individual rate-determining steps the 106th, the 108th, the 110th, the 112nd, the 114th, the 116th, the 118th, the 120th, 122.The 108th, the 106th, rate-determining steps 110 form measurement task
124.Measurement task 124 is substantially based on hardware and performs.The 120th, the 118th, the 116th, the 114th, the 112nd, rate-determining steps 122 form control times
Business 126.Control task 126 is substantially based on software and performs.
Control is carried out by means of pulsewidth modulation.In FIG, 128 expression pulse width signal.Pulse width signal 128 is to modulate frequency
Rate converts between two values rectangle.Produce impulse waveform or dutycycle at this.Cycle for the pulse of pulse width signal 128
Sequence, dutycycle illustrates the ratio in pulse duration and cycle duration.Dutycycle is modulated.Here, modulating frequency is
20kHz.In measurement task 126, it is also determined that for the impulse waveform of one or more time steps followed.Pulse width signal
The high level of 128 firstly there are 35 μ s and shortens to 30 μ s subsequently in control task 126 and shorten to 25 μ s subsequently at this.
Control process 104 performs with control frequency with being repeated cyclically.Here, control frequency is 10kHz.At time point
t0, control process 104 is triggered in trigger point 130.As the end of measurement task 124 triggers control task 126.In control
In step 120, determine trigger point 132 for performing control process 104 subsequently.Impulse waveform is determined in rate-determining steps 122.?
The 120th, rate-determining steps is also carried out space vector modulation in 122.The 120th, the rate-determining steps with space vector modulation 122 is adjusted at this
With twice.Here, the execution of control process 104 continues four time steps 102, the subsequent execution of rate-determining steps 104 is in the time
Point t4Start.Before control process re-executes subsequently, the execution of control process 104 terminates.
Fig. 2 illustrates the Field orientable control carrying out with the motor to electronic commutation for the modulating frequency, wherein said modulation frequency
Rate reduces relative to control frequency, and described motor runs by means of space vector modulation.
The sequential with time step 202 is shown with curve Figure 200 in fig. 2.Control process 204 includes multiple time step
Long by 206th, the 208th, the 210th, the 212nd, the 214th, the 216th, 218.The 208th, the 206th, rate-determining steps 210 form measurement task 220.Rate-determining steps is the 212nd,
214th, the 216th, 218 control task 222 is formed.It is also determined that be used for one or more follow-up time steps in rate-determining steps 218
Impulse waveform.Here, arrange the impulse waveform of 30 μ s when performing control process 204 for the first time, performing subsequently to control
The impulse waveform of 40 μ s is set during journey 204, the impulse waveform of 15 μ s is set when performing control process 204 subsequently, holds subsequently
The impulse waveform of 30 μ s is set during row control process 204.Here, control process 204 performs in time step 202.Its remaining part
Divide complementally specifically referring to Fig. 1 and related description.
Reference numerals list
100 curve maps
102 time steps
104 control processes
106 rate-determining steps
108 rate-determining steps
110 rate-determining steps
112 rate-determining steps
114 rate-determining steps
116 rate-determining steps
118 rate-determining steps
120 rate-determining steps
122 rate-determining steps
124 measurement tasks
126 control tasks
128 pulse width signals
130 trigger points
132 trigger points
200 curve maps
202 time steps
204 control processes
206 rate-determining steps
208 rate-determining steps
210 rate-determining steps
212 rate-determining steps
214 rate-determining steps
216 rate-determining steps
218 rate-determining steps
220 measurement tasks
222 control tasks
Claims (10)
1. control a method for the motor of electronic commutation, institute in time discrete mode by means of time-discrete modulator approach
State the electric drive motor of motor especially motor vehicles, it is characterised in that general's control frequency and modulating frequency are apart from each other
Set.
2. method according to claim 1, it is characterised in that improve described modulating frequency relative to described control frequency.
3. according to the method that at least one in the claims is described, it is characterised in that be set as described modulating frequency
The twice of described control frequency.
4. according to the method that at least one in the claims is described, it is characterised in that exist by means of described modulating frequency
Zero vector is measured electric current and rotor-position.
5. according to the method that at least one in the claims is described, it is characterised in that perform institute with described control frequency
State electric current control task and space vector modulation.
6. method according to claim 5, it is characterised in that perform described space arrow in a time step (102)
Amount modulation is twice.
7. method according to claim 1, it is characterised in that reduce described modulating frequency relative to described control frequency.
8. method according to claim 7, it is characterised in that determine in control task (222) for after at least one
The impulse waveform of continuous time step (202).
9. method according to claim 8, it is characterised in that use the viewer of control technology to determine impulse waveform.
10. according to the method that at least one in the claims is described, it is characterised in that change described when operation is carried out
Modulating frequency and/or described control frequency.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102015214839.4 | 2015-08-04 | ||
| DE102015214839.4A DE102015214839A1 (en) | 2015-08-04 | 2015-08-04 | Method for discrete-time control of an electronically commutated electric motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106452220A true CN106452220A (en) | 2017-02-22 |
Family
ID=57853849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610625729.7A Pending CN106452220A (en) | 2015-08-04 | 2016-08-02 | Method for time-discrete control of electronically commutated electric motor |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106452220A (en) |
| DE (1) | DE102015214839A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017221390A1 (en) | 2017-11-29 | 2019-05-29 | Audi Ag | Method for operating a motor vehicle and corresponding motor vehicle |
| DE102018204221A1 (en) * | 2018-03-20 | 2019-09-26 | Robert Bosch Gmbh | Method for controlling a pulse width modulated converter and pulse width modulated converter |
| DE102018106658A1 (en) | 2018-03-21 | 2019-09-26 | Schaeffler Technologies AG & Co. KG | Method for controlling an electric machine, in particular an electric drive motor of a vehicle |
| DE102018106608A1 (en) | 2018-03-21 | 2019-09-26 | Schaeffler Technologies AG & Co. KG | Method for thermal management of an electric drive system of a vehicle |
| CN112865584B (en) * | 2019-11-12 | 2022-06-03 | 上海汽车变速器有限公司 | Space vector pulse width modulation system |
| DE102019133541A1 (en) * | 2019-12-09 | 2021-06-10 | Dspace Digital Signal Processing And Control Engineering Gmbh | Method for controlling an electric motor and device for carrying out the method |
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| CN101536302A (en) * | 2006-10-30 | 2009-09-16 | 邦巴尔迪尔运输有限公司 | Open-loop and/or closed-loop control of a 3-phase power converter for the operation of an asynchronous machine |
| US20100016032A1 (en) * | 2008-07-15 | 2010-01-21 | Research In Motion Limited | Mobile wireless communications device with separate in-phase and quadrature power amplification |
| CN102474208A (en) * | 2009-10-02 | 2012-05-23 | 爱信艾达株式会社 | Control device for electric motor drive apparatus |
| CN102577093A (en) * | 2009-11-30 | 2012-07-11 | 爱信艾达株式会社 | Control device of motor drive device |
| US20120212204A1 (en) * | 2011-02-18 | 2012-08-23 | Intersil Americas Inc. | System and method for improving regulation accuracy of switch mode regulator during dcm |
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| DE102011086583A1 (en) | 2011-11-17 | 2013-05-23 | Schaeffler Technologies AG & Co. KG | Method for testing commutation quality of electronic commutated electromotor in hydraulic actuating system of friction clutch of motor car, involves comparing actual distance covered rotational angle with spanned rotation angle |
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2015
- 2015-08-04 DE DE102015214839.4A patent/DE102015214839A1/en active Pending
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2016
- 2016-08-02 CN CN201610625729.7A patent/CN106452220A/en active Pending
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| CN101536302A (en) * | 2006-10-30 | 2009-09-16 | 邦巴尔迪尔运输有限公司 | Open-loop and/or closed-loop control of a 3-phase power converter for the operation of an asynchronous machine |
| US20100016032A1 (en) * | 2008-07-15 | 2010-01-21 | Research In Motion Limited | Mobile wireless communications device with separate in-phase and quadrature power amplification |
| CN102474208A (en) * | 2009-10-02 | 2012-05-23 | 爱信艾达株式会社 | Control device for electric motor drive apparatus |
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| US20120212204A1 (en) * | 2011-02-18 | 2012-08-23 | Intersil Americas Inc. | System and method for improving regulation accuracy of switch mode regulator during dcm |
| CN103733504A (en) * | 2011-08-15 | 2014-04-16 | 株式会社明电舍 | Pm motor position-sensorless control device |
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| Publication number | Publication date |
|---|---|
| DE102015214839A1 (en) | 2017-02-09 |
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