CN204836003U - Brushless DC motor driver chip and system - Google Patents
Brushless DC motor driver chip and system Download PDFInfo
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- CN204836003U CN204836003U CN201520603100.3U CN201520603100U CN204836003U CN 204836003 U CN204836003 U CN 204836003U CN 201520603100 U CN201520603100 U CN 201520603100U CN 204836003 U CN204836003 U CN 204836003U
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Abstract
The utility model discloses a brushless DC motor driver chip and system belongs to the technical field of electric machine control, and the chip includes: clock generation circuit and power management circuit, analog to digital conversion circuit for be data signal with analog signal transition, position detection circuitry for convert position sensor's output signal into data signal, acquire electric motor rotor's positional information and current rotational speed, the digital process unit is used for the basis electric motor rotor position and current rotational speed, and combine the motor control parameter, the motor state parameter that obtain to export each looks coil PWM signal of motor, the gate drive circuit for will through the boostrap circuit each looks coil PWM signal conversion of motor is high -pressure drive signal and exports high -pressure drive signal. The system includes position sensor, power tube and motor drive chip. The utility model discloses it is together integrated with driver chip with brushless DC motor control, chip integration degree and flexibility has improved greatly.
Description
Technical field
The utility model relates to a kind of brshless DC motor driving chip and system, belongs 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 in the utility model 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 utility model 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, its input is connected respectively with the output of clock generation circuit, digital processing element, for detect obtain Motor control parameters, motor status parameter analog signal and be converted into digital signal;
Position detecting circuit, its input is connected with position transducer, 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, its input is connected respectively with the output of D/A converting circuit, position detecting circuit, for according to described motor rotor position and current rotating speed, and combine the Motor control parameters, each phase coil pwm signal of motor status parameter output motor that obtain;
Gate driver circuit, its input is connected with the output of digital processing element, for each for described motor phase coil pwm signal being converted to high-voltage driven signal and output by boostrap circuit.
Further, as a kind of optimal technical scheme of the present utility model, all circuit of described chip and unit are all integrated on same substrate.
Further, as a kind of optimal technical scheme of the present utility model, described chip also comprises signal and amplifies and comparison circuit, and described signal amplification is connected with the input of position detecting circuit with comparison circuit.
Further, as a kind of optimal technical scheme of the present utility model, described digital processing element comprises Duty ratio control unit, modulating function produces circuit, triangular carrier produces circuit and PWM generation unit, and described Duty ratio control unit and modulating function produce circuit and be connected; Described modulating function produces circuit, triangular carrier produces circuit and is connected with PWM generation unit respectively.
Further, as a kind of optimal technical scheme of the present utility model, described digital processing element comprises closed-loop drive unit, and described closed-loop drive unit is connected with Duty ratio control unit.
The utility model also provides a kind of BLDCM Drive System, and described system comprises position transducer, power tube, and above-mentioned brushless electric machine driving chip; Wherein, described position transducer is for detecting motor rotor position; The input link position transducer of described brushless electric machine driving chip and output are connected with power tube; This brushless electric machine driving chip for obtaining motor rotor position and current rotating speed, and combines acquisition Motor control parameters, motor status parameter by each phase coil applying pwm signal of power tube to brshless DC motor.
The utility model adopts technique scheme, can produce following technique effect:
(1) brshless DC motor driving chip provided by the utility model 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 utility model employing take digital processing as the circuit engineering of core, compared with traditional circuit engineering based on board design, improves 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 utility model embodiment, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, 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 utility model embodiment is described in detail.Should be clear and definite, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
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.
The utility model proposes motor control chip is integrated with raster data model together with, 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 utility model embodiment 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.Wherein, the input of analog to digital conversion circuit 110 is connected respectively with the output of clock generation circuit 140, digital processing element 120; Described position detecting circuit 130, its input is connected with position transducer; The input of described digital processing element 120 is connected respectively with the output of D/A converting circuit 110, position detecting circuit 130, and the output of digital processing element 120 is also connected with the input of gate driver circuit 150.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 the basic function 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 chip also comprises the signal be connected with position detecting circuit and amplifies 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.This modulation algorithm can adopt algorithm well known in the prior art to carry out.
For convenience of further understanding, the utility model embodiment provides 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, modulating function produce circuit 240, triangular carrier produces circuit 230 and PWM generation unit 250, and described Duty ratio control unit 220 and modulating function produce circuit 240 and be connected; Described modulating function produces circuit 240, triangular carrier produces circuit 230 and is connected with PWM generation unit 250 respectively.
Wherein, 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 difference of the rotating speed of target of duty cycle control signal set by Motor control parameters and current rotating speed is obtained by existing adjustment algorithm; 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, also can be approximate saddle ripple.
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, described closed-loop drive unit is connected with Duty ratio control unit 220, for basis from the rotating speed of target set and current rotating speed, regulate 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 utility model embodiment 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, the wherein input link position transducer 420 of motor drive ic 410, and output is connected with power tube 440; Described 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 utility model 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 the unit of each example that embodiment disclosed herein describes, can realize with electronic hardware module, generally describe composition and the annexation of each example in the above description according to function.Particularly, the computing of described electronic hardware module and control section can dredging collateral logic hardware realize, and it can be use the produced logical integrated circuit of existing integrated circuit technology, and the present embodiment is not construed as limiting this.
Further, in the utility model, all adopt electronic hardware module, utilize technology for detection commonly known in the art, transmission and modulation, adjustment, output.Electronic hardware module is not made improvements itself, also do not also have specific method flow.The correlation module related in the utility model and the function of realization thereof be hardware after improvement and formation thereof device on carry computer software programs conventional in prior art or pertinent protocols just can realize, be not that computer software programs of the prior art or pertinent protocols are improved.Innovation of the present utility model is the improvement of hardware module in prior art and connects syntagmatic, but not be in hardware module for realizing the improvement of software or the agreement of carrying about function.
Above-described embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; be understood that; the foregoing is only embodiment of the present utility model; and be not used in restriction protection range of the present utility model; all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (6)
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, its input is connected respectively with the output of clock generation circuit, digital processing element, for detect obtain Motor control parameters, motor status parameter analog signal and be converted into digital signal;
Position detecting circuit, its input is connected with the output of position transducer, 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, its input is connected respectively with the output of D/A converting circuit, position detecting circuit, for according to described motor rotor position and current rotating speed, and combine the Motor control parameters, each phase coil pwm signal of motor status parameter output motor that obtain;
Gate driver circuit, its input is connected with the output of digital processing element, for each for described motor phase coil pwm signal being converted to high-voltage driven signal and output 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, is characterized in that, described chip also comprises signal and amplifies and comparison circuit, and described signal amplifies and is connected with the input of position detecting circuit with comparison circuit.
4. brshless DC motor driving chip according to claim 1, it is characterized in that, described digital processing element comprises Duty ratio control unit, modulating function produces circuit, triangular carrier produces circuit and PWM generation unit, and described Duty ratio control unit and modulating function produce circuit and be connected; Described modulating function produces circuit, triangular carrier produces circuit and is connected with PWM generation unit respectively.
5. brshless DC motor driving chip according to claim 4, it is characterized in that, described digital processing element comprises closed-loop drive unit, and described closed-loop drive unit is connected with Duty ratio control unit.
6. 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 1-5; Wherein, described position transducer is for detecting motor rotor position; The input link position transducer of described brushless electric machine driving chip and output are connected with power tube; This 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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| Application Number | Priority Date | Filing Date | Title |
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| CN201520603100.3U CN204836003U (en) | 2015-08-12 | 2015-08-12 | Brushless DC motor driver chip and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520603100.3U CN204836003U (en) | 2015-08-12 | 2015-08-12 | Brushless DC motor driver chip and system |
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| CN204836003U true CN204836003U (en) | 2015-12-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110868115A (en) * | 2019-10-28 | 2020-03-06 | 深圳市汇川技术股份有限公司 | Motor suitable for sensorless control |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110868115A (en) * | 2019-10-28 | 2020-03-06 | 深圳市汇川技术股份有限公司 | Motor suitable for sensorless control |
| CN110868115B (en) * | 2019-10-28 | 2022-04-29 | 深圳市汇川技术股份有限公司 | Motor suitable for sensorless control |
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Effective date of registration: 20160707 Address after: 100020, No. 3, 1 gate, No. 102, 1 North Hospital, eight Li Li village, Beijing, Chaoyang District Patentee after: Jin Xuecheng Address before: 702, room 210011, block A, No. 611, Gulou, Nanjing, Zhongshan North Road, Jiangsu Patentee before: Zhou Haibo |