CN105186943A - Brushless direct-current motor drive chip and brushless direct-current motor drive system - Google Patents
Brushless direct-current motor drive chip and brushless direct-current motor drive system Download PDFInfo
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- CN105186943A CN105186943A CN201510491180.2A CN201510491180A CN105186943A CN 105186943 A CN105186943 A CN 105186943A CN 201510491180 A CN201510491180 A CN 201510491180A CN 105186943 A CN105186943 A CN 105186943A
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Abstract
The invention discloses a brushless direct-current motor drive chip and a brushless direct-current motor drive system, and belongs to the technical field of motor control. The chip comprises a clock generation circuit, a power management circuit, an analog-to-digital conversion circuit used for converting analog signals of motor control parameters and motor state parameters into digital signals, a position detection circuit used for converting an output signal of a position sensor into a digital signal and acquiring rotor position information and current speed, a digital processing unit used for outputting PWM signals of motor coils of all phases according to the motor rotor position and current speed, the motor control parameters, the motor state parameters and a modulation algorithm, and a gate drive circuit used for converting the PWM signals of the motor coils of all phases into high-voltage drive signals through a bootstrap circuit and outputting the high-voltage drive signals. The system comprises a position sensor, a power tube, and the brushless motor drive chip. By integrating brushless direct-current motor control and the drive chip, the degree of integration and flexibility of the chip are improved greatly.
Description
Technical field
The present invention relates to a kind of brshless DC motor driving chip and system, belong to the technical field of Electric Machine Control.
Background technology
Brushless motor utilizes electronic commutation to instead of mechanical commutation, overcome the series of problems that Traditional DC motor produces due to brush friction, and have that good speed adjustment features, volume are little, efficiency advantages of higher, be thus widely used in every field that national economy produces and daily life.
Along with the development of control theory, material science, microelectric technique etc., Electric Machine Control is increasingly sophisticated and intelligent.Traditional design of the motor chip based on analog, is difficult to provide highly intelligentized Electric Machine Control on the one hand, and portability and the flexibility of chip design are on the other hand poor, cause design cycle and difficulty all significantly to increase.In addition; in current application scheme, Electric Machine Control and driving are normally separated; complete respective function by least two chips, which increase application difficulty and system cost, simultaneously due to the existence of stray inductance, electric capacity etc. be also unfavorable for abnormal timely, protect reliably.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, a kind of brshless DC motor driving chip and system are provided, the Electric Machine Control solving existing motor is normally separated with driving, respective function is completed by least two chips, and portable and that flexibility is poor technical problem.
The present invention specifically solves the problems of the technologies described above by the following technical solutions:
A kind of brshless DC motor driving chip, comprising:
Clock generation circuit, for generation of the system clock of chip;
Electric power management circuit, for generation of the supply power voltage of chip;
Analog to digital conversion circuit, for detect obtain Motor control parameters, motor status parameter analog signal and be converted into digital signal;
Position detecting circuit, for the output signal of position transducer is converted to digital signal, obtains the positional information of rotor and current rotating speed;
Digital processing element, for according to described motor rotor position and current rotating speed, Motor control parameters, motor status parameter, and each phase coil pwm signal of set modulation algorithm output motor;
Gate driver circuit, for be converted to the high-voltage driven signal that adapts with power device and to be exported by high-voltage driven signal by each for described motor phase coil pwm signal by boostrap circuit.
Further, as a preferred technical solution of the present invention, all circuit of described chip and unit are all integrated on same substrate.
Further, as a preferred technical solution of the present invention, described chip has open loop speed governing and closed-loop drive pattern.
Further, as a preferred technical solution of the present invention, during described chip employing open loop speed-regulating mode, described Motor control parameters comprises the analog voltage with the proportional relation of duty ratio putting on motor each phase coil pwm signal; During described chip employing closed-loop drive pattern, described Motor control parameters comprises the analog voltage with the proportional relation of motor rotating speed of target.
Further, as a preferred technical solution of the present invention, described position detecting circuit comprises signal and amplifies and comparison circuit, for carrying out amplification ratio comparatively to the output signal of position transducer.
Further, as a preferred technical solution of the present invention, described motor status parameter comprises the sampling voltage of bus current.
Further, as a preferred technical solution of the present invention, described digital processing element comprises:
Triangular carrier produces circuit, for generation of the triangular carrier of fixed frequency;
Duty ratio control unit, for generating the control signal of pwm signal duty ratio according to described Motor control parameters;
Modulating function produces circuit, produces modulating function for the control signal according to modulation algorithm and described pwm signal duty ratio;
PWM generation unit, after modulating described modulating function for utilizing described triangular carrier, the position according to described rotor generates each phase coil pwm signal of motor.
Further, as a preferred technical solution of the present invention, described digital processing element comprises closed-loop drive unit, for the current rotating speed obtained according to motor rotating speed of target and described position detecting circuit, the duty ratio of each phase coil pwm signal of motor is regulated to reach rotating speed of target gradually to make motor speed.
The present invention also proposes a kind of BLDCM Drive System, and described system comprises: position transducer, power tube, and the brushless electric machine driving chip described in the arbitrary claim of the claims 1-8; Wherein, described position transducer is for detecting motor rotor position; Described brushless electric machine driving chip for obtaining motor rotor position and current rotating speed, and combines the Motor control parameters, the motor status parameter that obtain and applies pwm signal by power tube to each phase coil of brshless DC motor.
The present invention adopts technique scheme, can produce following technique effect:
(1) brshless DC motor driving chip provided by the present invention and system; by brshless DC motor being controlled integrate with driving chip; substantially increase chip integration; reduce difficulty and the cost of system application; improve the flexibility of application; various abnormal protection mechanism can directly act on gate driver circuit simultaneously, more in time, reliably can implement protection.
(2) the present invention's employing take digital processing as the circuit engineering of core, namely the function such as all motor control algorithms and abnormality processing all realizes in special digital circuit, compared with traditional circuit engineering based on board design, improve portability and the flexibility of chip design; Compare with the motor control schemes of software with based on MCU, shorten the construction cycle, reduce application difficulty and cost, and substantially increase the reliability of chip, avoid the chip failure because storage element information dropout, software driving etc. cause.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the module diagram of a kind of typical BLDCM Drive System in prior art.
The module diagram of a kind of brshless DC motor driving chip that Fig. 2 provides for the embodiment of the present invention.
The module diagram of a kind of digital processing element that Fig. 3 provides for the embodiment of the present invention.
The application schematic diagram of the gate driver circuit that Fig. 4 provides for the embodiment of the present invention.
The gate driver circuit that Fig. 5 provides for the embodiment of the present invention is converted to the schematic diagram of high-voltage driven signal by bootstrap capacitor.
The module diagram of a kind of BLDCM Drive System that Fig. 6 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.Should be clear and definite, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, in prior art, a brushless motor control system comprises motor control chip, grid drive chip, power device and position transducer usually.Consider from aspects such as reliability, application difficulty, heat radiation, PCB spaces, usually wish that level of integrated system is more high better.In small-power (below ratio 200W) Electric Machine Control, usually the part peripheral component package such as the grid drive chip shown in Fig. 1, power device and diode are become a chips, i.e. so-called Intelligent Power Module (IPM).For three-phase brushless dc motor, IPM typically includes 3 grid drive chip, 6 power devices and some diodes etc. 10 multiple chips and components and parts.So many chip is together with component package, and the difficulty, cost etc. of encapsulation suddenly increase, and yield declines, and heat dissipation problem limits its power bracket be suitable for simultaneously, is generally only applicable to low-power machine application.
Together with the present invention's proposition is integrated with raster data model by motor control chip, become integrated drive chips.First, integrated drive chips still can together with power device package, compared with IPM, components and parts decreased number, function but adds, and integrated level improves greatly; Secondly, integrated drive chips can be supporting from different power devices, to be applicable to the application of different capacity scope; Again, Electric Machine Control and driving integrate, and except integrated level improves, the abnormal protection such as overcurrent, excess temperature of motor can be more timely, intelligent.
The embodiment of the present invention is implemented one and is provided a kind of brshless DC motor driving chip, as shown in Figure 2, described chip comprises analog to digital conversion circuit 110, digital processing element 120, position detecting circuit 130, clock generating circuit 140, gate driver circuit 150 and electric power management circuit 170 to its module diagram.All circuit of this chip and unit are all integrated on same substrate.
Clock generation circuit 140 and electric power management circuit 170 produce system clock and the supply power voltage of chip respectively.Analog to digital conversion circuit 110 is main interface circuits, the multi-channel analog signals such as Motor control parameters, motor status parameter are converted to digital signal, so that adopt digital processing method to complete basic function and the advanced algorithm of Electric Machine Control, preferably, described motor status parameter can comprise the sampling voltage of bus current.Position detecting circuit 130 is responsible for the output signal of position transducer being converted to digital signal, to obtain the positional information of rotor and current rotating speed.For three-phase brushless dc motor, general employing three Hall elements carry out perception motor rotor position, accordingly 360 electric angles are divided into 6 sectors; According to the output of Hall element, the positional information of electronics rotor and current rotating speed can be obtained.Further, described position detecting circuit also comprises signal amplification and comparison circuit, for carrying out amplification ratio comparatively to the output signal of position transducer.
Digital processing element 120 is cores of chip, the digital signal that main process analog to digital conversion circuit 110 and position detecting circuit 130 obtain, and exports each phase pwm signal according to built-in modulation algorithm.
For convenience of further understanding, embodiments provide a kind of module diagram of digital processing element 120, as shown in Figure 3, digital processing element 120 comprises:
Duty ratio control unit 220, generates the control signal of motor each phase pwm signal duty ratio according to described Motor control parameters.The generating mode of duty cycle control signal is relevant with Electric Machine Control pattern, is specially:
When adopting open loop speed-regulating mode, duty cycle control signal is directly obtained after analog to digital conversion circuit is changed by Motor control parameters; When adopting closed-loop drive pattern, the rotating speed of target of duty cycle control signal set by Motor control parameters passes through to regulate algorithm to obtain with the difference of current rotating speed; Described adjustment algorithm can be part or all of in ratio, integration, differential (PID) method.
Triangular carrier produces circuit 230, for generation of the triangular carrier of fixed frequency.
Modulating function produces circuit 240, produces modulating function for the control signal according to modulation algorithm and described duty ratio.
Particularly, determine the shape of described Tuning function according to described modulation algorithm, and the control signal of described duty ratio is in order to determine the amplitude of described modulating function; The shape of described modulating function can be sinusoidal wave, and also can be approximate saddle ripple, this depends on adopted algorithm.
PWM generation unit 250, after utilizing described triangular carrier to modulate described modulating function, the position according to described rotor generates each phase pwm signal of motor.
Therefore, described chip has open loop speed governing and closed-loop drive pattern, can be selected by chip pin or on-chip memory cell: when adopting open loop speed-regulating mode, described Motor control parameters comprises the analog voltage with the duty ratio proportion relation putting on each phase coil pwm signal of motor; When adopting closed-loop drive pattern, described Motor control parameters comprises the analog voltage with motor rotating speed of target proportion relation.
Preferably, described digital processing element 120 can also comprise closed-loop drive unit, for according to from the rotating speed of target set and current rotating speed, regulates the duty ratio of each phase pwm signal of motor, motor speed is moved closer to and even equals rotating speed of target.
Control for simple and easy sine wave, the pwm signal that Fig. 4 gives modulating wave (saddle ripple), triangular carrier and generates.So-called modulation, namely modulating wave is according to certain rule compared with triangular carrier, generates the pwm signal shown in figure.
Gate driver circuit 150 is drive parts of chip.As shown in Figure 5, the pwm signal that digital processing element 120 exports can not Direct driver high side power pipe.Usual employing boostrap circuit improves the level of high side power tube grid control signal, to ensure the smooth conducting of high side power pipe and to make its conducting resistance little as far as possible.For preventing the power tube break-through of high and low side, between the pwm signal of same mutually high and low side power tube, insert dead band.In Fig. 5, bootstrap capacitor CB becomes the source electrode reference power supply of high side power pipe, supplies its grid.For preventing the unlatching and the conducting that affect high side power pipe because CB electric discharge is remarkable, need to charge to CB at set intervals; Charge path as shown in phantom in Figure 5.
The embodiment of the present invention is implemented two and is provided a kind of driving system for brushless motor, as shown in Figure 6, comprise motor drive ic 410, position transducer 420, brshless DC motor 430 and power tube 440, wherein motor drive ic 410 can adopt above-mentioned brushless electric machine driving chip; Described position transducer 420 is for detecting motor rotor position; Described brushless electric machine driving chip 410 for obtaining motor rotor position and current rotating speed, and combines the Motor control parameters, the motor status parameter that obtain and applies pwm signal by power tube 440 to each phase coil of brshless DC motor 430.
In system, brshless DC motor 430 is specifically made up of stators and rotators two parts, and stator winding can be single-phase, two-phase or three equal, and rotor is then made up of by certain number of pole-pairs permanent magnet.
Further, in described system, the motor status parameter obtained comprises the parameters such as motor bus current.
To sum up; brshless DC motor driving chip provided by the present invention and system; by brshless DC motor being controlled integrate with driving chip; substantially increase chip integration; reduce difficulty and the cost of system application; improve the flexibility of application, various abnormal protection mechanism can directly act on gate driver circuit simultaneously, more in time, reliably can implement protection.
Professional should recognize further, in conjunction with unit and the algorithm steps of each example of embodiment disclosed herein description, can realize with electronic hardware, generally describe composition and the step of each example in the above description according to function.Use distinct methods to realize described function to each specifically should being used for, but this realization should not think the scope exceeding the embodiment of the present invention.Particularly, described computing and control section can dredging collateral logic hardware realize, and it can be use the produced logical integrated circuit of integrated circuit technology, and the present embodiment is not construed as limiting this.
The software module that the method described in conjunction with embodiment disclosed herein or the step of algorithm can use hardware, processor to perform, or the combination of the two is implemented.Software module can be placed in the storage medium of other form any known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a brshless DC motor driving chip, is characterized in that, comprising:
Clock generation circuit, for generation of the system clock of chip;
Electric power management circuit, for generation of the supply power voltage of chip;
Analog to digital conversion circuit, for detect obtain Motor control parameters, motor status parameter analog signal and be converted into digital signal;
Position detecting circuit, for the output signal of position transducer is converted to digital signal, obtains the positional information of rotor and current rotating speed;
Digital processing element, for according to described motor rotor position and current rotating speed, Motor control parameters, motor status parameter, and each phase coil pwm signal of set modulation algorithm output motor;
Gate driver circuit, for be converted to the high-voltage driven signal that adapts with power device and to be exported by high-voltage driven signal by each for described motor phase coil pwm signal by boostrap circuit.
2. brshless DC motor driving chip according to claim 1, it is characterized in that, all circuit of described chip and unit are all integrated on same substrate.
3. brshless DC motor driving chip according to claim 1, it is characterized in that, described chip has open loop speed governing and closed-loop drive pattern.
4. brshless DC motor driving chip according to claim 3, is characterized in that, when described chip adopts open loop speed-regulating mode, described Motor control parameters comprises the analog voltage with the proportional relation of duty ratio putting on motor each phase coil pwm signal; During described chip employing closed-loop drive pattern, described Motor control parameters comprises the analog voltage with the proportional relation of motor rotating speed of target.
5. brshless DC motor driving chip according to claim 1, is characterized in that, described position detecting circuit comprises signal and amplifies and comparison circuit, for carrying out amplification ratio comparatively to the output signal of position transducer.
6. brshless DC motor driving chip according to claim 1, it is characterized in that, described motor status parameter comprises the sampling voltage of bus current.
7. brshless DC motor driving chip according to claim 1, it is characterized in that, described digital processing element comprises:
Triangular carrier produces circuit, for generation of the triangular carrier of fixed frequency;
Duty ratio control unit, for generating the control signal of pwm signal duty ratio according to described Motor control parameters;
Modulating function produces circuit, produces modulating function for the control signal according to modulation algorithm and described pwm signal duty ratio;
PWM generation unit, after modulating described modulating function for utilizing described triangular carrier, the position according to described rotor generates each phase coil pwm signal of motor.
8. brshless DC motor driving chip according to claim 1, it is characterized in that, described digital processing element comprises closed-loop drive unit, for the current rotating speed obtained according to motor rotating speed of target and described position detecting circuit, the duty ratio of each phase coil pwm signal of motor is regulated to reach rotating speed of target gradually to make motor speed.
9. a BLDCM Drive System, is characterized in that, described system comprises position transducer, power tube, and the brushless electric machine driving chip described in the arbitrary claim of the claims 1-8; Wherein, described position transducer is for detecting motor rotor position; Described brushless electric machine driving chip for obtaining motor rotor position and current rotating speed, and combines the Motor control parameters, the motor status parameter that obtain and applies pwm signal by power tube to each phase coil of brshless DC motor.
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| CN201510491180.2A CN105186943A (en) | 2015-08-12 | 2015-08-12 | Brushless direct-current motor drive chip and brushless direct-current motor drive system |
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| CN201510491180.2A CN105186943A (en) | 2015-08-12 | 2015-08-12 | Brushless direct-current motor drive chip and brushless direct-current motor drive system |
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Cited By (7)
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| CN106054077A (en) * | 2016-07-08 | 2016-10-26 | 珠海格力电器股份有限公司 | Speed regulation voltage switching circuit and power panel |
| CN106788062A (en) * | 2017-02-24 | 2017-05-31 | 英特格灵芯片(天津)有限公司 | A kind of control device of brshless DC motor, system and method |
| WO2017128052A1 (en) * | 2016-01-26 | 2017-08-03 | 深圳市大疆创新科技有限公司 | Unmanned aerial vehicle and electrical motor control chip and electronic governor thereof |
| CN108282117A (en) * | 2018-01-25 | 2018-07-13 | 海信（山东）空调有限公司 | A kind of DC fan starts method, control circuit and air conditioner |
| CN109462351A (en) * | 2018-11-16 | 2019-03-12 | 杭州百隆电子有限公司 | A kind of motor speed regulation system and its related chip, circuit module and method |
| TWI675544B (en) * | 2018-04-24 | 2019-10-21 | 建準電機工業股份有限公司 | Location detection system for use in a brushless direct current motor and switching method thereof |
| CN111740648A (en) * | 2020-05-28 | 2020-10-02 | 佛吉亚(无锡)座椅部件有限公司 | Intelligent actuator adopting brushless direct current motor and control method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2017128052A1 (en) * | 2016-01-26 | 2017-08-03 | 深圳市大疆创新科技有限公司 | Unmanned aerial vehicle and electrical motor control chip and electronic governor thereof |
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| CN106054077A (en) * | 2016-07-08 | 2016-10-26 | 珠海格力电器股份有限公司 | Speed regulation voltage switching circuit and power panel |
| CN106788062A (en) * | 2017-02-24 | 2017-05-31 | 英特格灵芯片(天津)有限公司 | A kind of control device of brshless DC motor, system and method |
| CN106788062B (en) * | 2017-02-24 | 2023-08-18 | 上海晶丰明源半导体股份有限公司 | Control device, system and method for brushless direct current motor |
| CN108282117A (en) * | 2018-01-25 | 2018-07-13 | 海信（山东）空调有限公司 | A kind of DC fan starts method, control circuit and air conditioner |
| CN108282117B (en) * | 2018-01-25 | 2020-04-21 | 海信（山东）空调有限公司 | Direct current fan starting method, control circuit and air conditioner |
| TWI675544B (en) * | 2018-04-24 | 2019-10-21 | 建準電機工業股份有限公司 | Location detection system for use in a brushless direct current motor and switching method thereof |
| CN110401380A (en) * | 2018-04-24 | 2019-11-01 | 建准电机工业股份有限公司 | Position sensing and its switching method for DC Brushless Motor |
| CN109462351A (en) * | 2018-11-16 | 2019-03-12 | 杭州百隆电子有限公司 | A kind of motor speed regulation system and its related chip, circuit module and method |
| CN111740648A (en) * | 2020-05-28 | 2020-10-02 | 佛吉亚(无锡)座椅部件有限公司 | Intelligent actuator adopting brushless direct current motor and control method thereof |
| CN111740648B (en) * | 2020-05-28 | 2022-09-13 | 佛吉亚(无锡)座椅部件有限公司 | Intelligent actuator adopting brushless direct current motor and control method thereof |
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Effective date of registration: 20160706 Address after: 100020, No. 3, 1 gate, No. 102, 1 North Hospital, eight Li Li village, Beijing, Chaoyang District Applicant after: Jin Xuecheng Address before: 702, room 210011, block A, No. 611, Gulou, Nanjing, Zhongshan North Road, Jiangsu Applicant before: Zhou Haibo |
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Application publication date: 20151223 |