CN205407647U - High -speed brushless direct current motor controller based on BUCK converter - Google Patents
High -speed brushless direct current motor controller based on BUCK converter Download PDFInfo
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- CN205407647U CN205407647U CN201620137806.XU CN201620137806U CN205407647U CN 205407647 U CN205407647 U CN 205407647U CN 201620137806 U CN201620137806 U CN 201620137806U CN 205407647 U CN205407647 U CN 205407647U
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Abstract
The utility model discloses a high -speed brushless direct current motor controller based on BUCK converter, including DC power supply, alternate the direct current for the buck converter of adjustable DC voltage for the three -phase inverting bridge of brushless DC motor commutation, hardware commutation circuit are used for the DSP control panel of signal of voltage and current's collection, PWM signal output, the control algorithm of motor, man -machine communication, and PWM drive module for brushless DC motor provides PWM drive signal still includes voltage/current detecting circuit, protection circuit, touch -sensitive screen. The utility model discloses a preceding control mode who adds the buck converter of three -phase inverting bridge parts direct current motor's commutation and speed governing function, adjusts through the buck converter, with the original PWM pulse voltage of DC voltage replacement, has effectively eliminated stator current's discontinuous saltus step, reduces the motor iron loss, adopt hardware logic commutation circuit to replace software commutation procedure, reduced the complexity of DSP procedure, make DSP be absorbed in the control algorithm of motor to control efficiency has been improved.
Description
Technical field
This utility model belongs to the control device of a kind of direct current generator, is specifically related to a kind of high-speed brushless DC electromotor controller based on BUCK changer.
Background technology
Brshless DC motor has the features such as outstanding mechanical property, good speed governing torque, higher efficiency, and range of application is very extensive.Current brshless DC motor adopts the control method of three phase inverter bridge PWM (pulse width modulation) mostly, when but the method is applied to high-speed electric expreess locomotive, owing to high-speed electric expreess locomotive armature inductance is less, the high frequency square wave voltage that PWM produces, cause additional iron loss in the rotor, causing that motor rises caloric value in week process excessive, temperature rises too fast.
Summary of the invention
This utility model proposes for solving prior art Problems existing, its objective is to provide a kind of high-speed brushless DC electromotor controller based on BUCK changer.
nullThe technical solution of the utility model is: a kind of high-speed brushless DC electromotor controller based on BUCK changer，Including DC source，The anode of DC source is connected with 1 foot of Buck changer，Negative terminal is connected with 2 feet of Buck changer，3 feet of Buck changer are connected with 1 foot of three phase inverter bridge，4 feet of Buck changer are connected with 2 feet of three phase inverter bridge by current sense resistor，4 feet of three phase inverter bridge、5 feet、6 feet in order with the A of brshless DC motor、B、C three-phase windings correspondence connects，Current sense resistor is connected with voltage and current detection circuit，Three phase inverter bridge、Brshless DC motor is all connected with hardware commutation circuit，Buck changer drives module to be connected with PWM，Described voltage and current detection circuit、PWM drives module to be all connected with DSP panel，Described DSP panel also with protection circuit、Touch screen is connected.
Described Buck changer is made up of+50V DC source, controllable silicon T1, diode D1, diode D2, filter inductance group and filter capacitor group, the PWM drive signal of controllable silicon T1 is by externally input, resistance R1, electric capacity C1, diode D1 form RCD absorbing circuit, for absorbing the high-frequency signal at controllable silicon T1 two ends, to reduce the switching loss of controllable silicon T1.
nullDescribed PWM drives module to include pwm signal driving chip、Optocoupler，2 feet of pwm signal driving chip resistance R2 in parallel、Electric capacity C2 is connected with pwm signal port，3 feet of pwm signal driving chip、5 feet are connected with GND，4 feet of pwm signal driving chip are connected with+15V，4 feet of pwm signal driving chip、5 feet respectively with the positive pole of electric capacity C3、Negative pole is connected，12 feet of pwm signal driving chip successively with Zener diode D3、Diode D4、Diode D5、+ 50V connects，15 feet of pwm signal driving chip successively with resistance R3、GPWM port connects,16 feet of pwm signal driving chip successively with resistance R4、GPWM port connects,17 feet of pwm signal driving chip are connected with EPWM port,13 feet of pwm signal driving chip are connected with 2 feet of optocoupler，18 feet of pwm signal driving chip are connected with 1 foot of optocoupler by resistance R7，1 foot of optocoupler、Resistance R8 it is also associated with between 2 feet.
Described voltage and current detection circuit includes current detection circuit and voltage detecting circuit.
nullDescribed current detection circuit includes No. I operational amplifier，Resistance R20 connects feedback current FKDL port，The other end and resistance R23、2 feet of electric capacity C15 and No. I operational amplifier connect，Resistance R23、The other end of electric capacity C15 is then connected with 1 foot of No. I operational amplifier，Resistance R21 connects GND port，The other end and resistance R22、3 feet of electric capacity C14 and No. I operational amplifier connect，Resistance R22、The other end of electric capacity C14 is connected with AGND，4 feet of No. I operational amplifier、11 feet respectively with+15VA、-15VA connects，Resistance R24 and I's operational amplifier 1 foot connects，The other end of resistance R24 and electric capacity C16、Electric capacity C17、The negative electrode of diode D13、The anode of diode D14 connects，Electric capacity C16、The other end of electric capacity C17 and the anode of diode D13 are connected with AGND，The negative electrode of diode D14 is then connected with 3.3VA.
nullDescribed voltage detecting circuit includes No. II operational amplifier，Resistance R26 connects feedback voltage FKDY port，The other end connects with 3 feet of resistance R28 and No. II operational amplifier，The other end of resistance R28 is connected with AGND，Resistance R25 connects GND port，The other end connects with 2 feet of resistance R27 and No. II operational amplifier，The other end of resistance R27 is connected with 1 foot of resistance R29 and No. II operational amplifier，The resistance R29 other end is connected with 5 feet of resistance R32 and No. II operational amplifier，The resistance R32 other end is connected with AGND，4 feet of No. II operational amplifier、11 feet respectively with+15VA、-15VA connects，6 feet of No. II operational amplifier and resistance R30、Resistance R31 connects，The other end of resistance R30 is connected with AGND，The other end of resistance R31 then with 7 feet of No. II operational amplifier、Electric capacity C18、Electric capacity C19、The negative electrode of diode D15、The anode of diode D16 connects，Electric capacity C18、The other end of electric capacity C19 and the anode of diode D15 are connected with AGND，The negative electrode of diode D16 is connected with 3.3VA.
Described protection circuit includes comparator, V AND gate, No. III phase inverter, feedback voltage FKDY port is connected with 6 feet of comparator, feedback current FKDL port is connected with 2 feet of comparator, 5 feet of+3.3VA and comparator, 3 feet connect, 7 feet of resistance R33 and comparator, 4 feet of V AND gate connect, 1 foot of resistance R34 and comparator, 5 feet of V AND gate connect, resistance R33, the other end of resistance R34 is connected with VCC, 1 foot of the negative electrode of diode D18 and No. III phase inverter, 6 feet of V AND gate connect, the anode of diode D18 is connected with VCC, 2 feet of No. III phase inverter are connected with resistance R35, the other end of resistance R35 is connected with+3.3V.
This utility model adds the control mode of Buck changer before adopting three phase inverter bridge, the commutation of direct current generator separated with speed-regulating function, and is shown by touch screen, regulated the parameter of electric machine, it is achieved that motor is controlled in real time；Regulated by Buck changer, replace original pwm pulse voltage with stable DC voltage, effectively eliminate the discontinuous saltus step of stator current, reduce motor iron loss；Adopt hardware logic commutation circuit to replace software commutation program, decreasing the complexity of DSP program, making DSP be absorbed in the control algolithm of motor, thus improve control efficiency.
Accompanying drawing explanation
Fig. 1 is this utility model brushless DC motor control system structured flowchart；
Fig. 2 is Buck converter circuit figure in this utility model；
Fig. 3 is that in this utility model, pwm signal drives module circuit diagram；
Fig. 4 is three phase inverter bridge cut-away view in this utility model；
Fig. 5 is the circuit diagram of three phase inverter bridge IPM module in this utility model；
Fig. 6 is hall signal value and three phase inverter bridge switching tube conducting corresponding diagram in this utility model；
Fig. 7 is the circuit diagram of hardware commutation in this utility model；
Fig. 8 is the circuit diagram of current detection circuit in this utility model；
Fig. 9 is the circuit diagram of voltage detecting circuit in this utility model；
Figure 10 is the circuit diagram of this utility model middle controller protection circuit；
Wherein:
1 DC source 2Buck changer
3 three phase inverter bridge 4 brshless DC motors
5 voltage and current detection circuit 6DSP panels
7 hardware commutation circuits 8 protect circuit
9 touch screen 10PWM drive module
11 current sense resistor 12 filter inductance groups
13 filter capacitor group 14PWM signal driving chip
15 optocoupler 16 three phase inverter bridge IPM modules
17 output voltage terminal 18 I phase inverters
19 I AND gate 20 II phase inverters
21 II AND gate 22 III AND gates
23 IV AND gate 24 I operational amplifiers
25 No. II operational amplifier 26 comparators
27 V AND gate 28 III phase inverters.
Detailed description of the invention
Hereinafter, with reference to drawings and Examples, this utility model is described in detail:
nullAs shown in Figure 1，A kind of high-speed brushless DC electromotor controller based on BUCK changer，Including DC source 1，The anode of DC source 1 is connected with 1 foot of Buck changer 2，Negative terminal is connected with 2 feet of Buck changer 2，3 feet of Buck changer 2 are connected with 1 foot of three phase inverter bridge 3，4 feet of Buck changer 2 are connected with 2 feet of three phase inverter bridge 3 by current sense resistor 11，4 feet of three phase inverter bridge 3、5 feet、6 feet in order with the A of brshless DC motor 4、B、C three-phase windings correspondence connects，Namely 4 feet of three phase inverter bridge 3 are connected with the A phase winding of brshless DC motor 4，5 feet of three phase inverter bridge 3 are connected with the B phase winding of brshless DC motor 4，6 feet of three phase inverter bridge 3 are connected with the C phase winding of brshless DC motor 4，Current sense resistor 11 is connected with voltage and current detection circuit 5，Three phase inverter bridge 3、Brshless DC motor 4 is all connected with hardware commutation circuit 7，Buck changer 2 drives module 10 to be connected with PWM，Described voltage and current detection circuit 5、PWM drives module 10 to be all connected with DSP panel 6，Described DSP panel 6 also with protection circuit 8、Touch screen 9 is connected.
Wherein, DC source 1 provides unidirectional current for brshless DC motor 4, DC power conversion is adjustable dc voltage by Buck changer 2, three phase inverter bridge 3, hardware commutation circuit 7 is for brshless DC motor 4 commutation, DSP panel 6 is for the collection of voltage and current signal, pwm signal exports, the control algolithm of motor, man-machine communication, voltage and current detection circuit 5 is for brshless DC motor 4 voltage x current collection, protection circuit 8 protects signal output function, PWM drives module 10 to provide PWM drive signal for brshless DC motor 4, touch screen 9 shows for brshless DC motor 4 parameter and regulates.
As shown in Figure 2, described Buck changer 2 is made up of+50V DC source, controllable silicon T1, diode D1, diode D2, filter inductance group 12 and filter capacitor group 13, the PWM drive signal of controllable silicon T1 is by externally input, resistance R1, electric capacity C1, diode D1 form RCD absorbing circuit, for absorbing the high-frequency signal at controllable silicon T1 two ends, to reduce the switching loss of controllable silicon T1.
nullDescribed Buck changer 2 includes+50V DC source port，+ 50V DC source port and resistance R1、The colelctor electrode of controllable silicon T1、The anode of diode D1 connects，The other end of resistance R1 and the negative electrode of diode D1 are connected with electric capacity C1，The other end of electric capacity C1 is connected with the emitter stage of controllable silicon T1，Drive signal GPWM、EPWM respectively with the base stage of controllable silicon T1、Emitter stage connects，The anode of diode D2 is connected with GND，The emitter stage of the negative electrode of diode D2 and controllable silicon T1、The other end of electric capacity C1 connects，Filter inductance group 12 in Buck changer 2 is composed in series by three inductance，One end of filter inductance group 12 simultaneously with the negative electrode of diode D2、The emitter stage of controllable silicon T1、The other end of electric capacity C1 connects，The other end is connected with filter capacitor group 13，Described filter capacitor group 13 is made up of two Capacitance parallel connections，Filter capacitor group 13 one end is connected with filter inductance group 12，The other end is connected with GND.
nullAs shown in Figure 3，PWM drives module 10 to include pwm signal driving chip 14、Optocoupler 15，2 feet of pwm signal driving chip 14 resistance R2 in parallel、Electric capacity C2 is connected with pwm signal port，3 feet of pwm signal driving chip 14、5 feet are connected with GND，4 feet of pwm signal driving chip 14 are connected with+15V，4 feet of pwm signal driving chip 14、Electric capacity C3 it is also associated with between 5 feet，12 feet of pwm signal driving chip 14 successively with Zener diode D3、Diode D4、Diode D5、+ 50V connects，15 feet of pwm signal driving chip 14 successively with resistance R3、GPWM port connects,16 feet of pwm signal driving chip 14 successively with resistance R4、GPWM port connects,17 feet of pwm signal driving chip 14 are connected with EPWM port,13 feet of pwm signal driving chip 14 are connected with 2 feet of optocoupler 15，18 feet of pwm signal driving chip 14 are connected with 1 foot of optocoupler 15 by resistance R7，1 foot of optocoupler 15、Resistance R8 it is also associated with between 2 feet.
nullPWM drives module 10 that the pwm signal of DSP is converted to positive and negative two-way and drives signal，Respectively with the base stage of controllable silicon T1、Emitter stage connects，Described PWM drives module 10 to include pwm signal driving chip 14，Pwm signal port and resistance R2、Electric capacity C2 connects，Resistance R2、The other end of electric capacity C2 is connected with 2 feet of pwm signal driving chip 14，GND is connected with 3 feet of pwm signal driving chip 14，4 feet of+15V and pwm signal driving chip 14、The anode of electric capacity C3 connects，5 feet of GND and pwm signal driving chip 14、The negative terminal of electric capacity C3 connects，12 feet of pwm signal driving chip 14 are connected with the negative electrode of Zener diode D3，The anode of Zener diode D3 is connected with the anode of diode D4，The negative electrode of diode D4 is connected with the anode of diode D5，The negative electrode of diode D5 is connected with+50V power port，Resistance R3 connects 15 feet of pwm signal driving chip 14，The other end of resistance R3 and resistance R5、Resistance R4 and GPWM port connect，Resistance R4 connects 16 feet of pwm signal driving chip 14，The other end of resistance R4 and resistance R5、GPWM port connects，Resistance R5 connects 17 feet of pwm signal driving chip 14，The other end is connected with GPWM port,Resistance R7 connects 18 feet of pwm signal driving chip 14，The other end of resistance R7 and resistance R8、1 foot of optocoupler 15 connects，Resistance R8 connects 13 feet of pwm signal driving chip 14 and 2 feet of optocoupler 15，The other end is connected with resistance R7，Resistance R6 connects 3 feet of optocoupler 15、PRO port，The other end is connected with+5V，4 feet of optocoupler 15 are connected with GND.
As shown in Figure 4, three phase inverter bridge 3 includes controllable silicon Q1, Q2, Q3, Q4, Q5, Q6, three phase inverter bridge 31 foot electricity with controllable silicon Q1, controllable silicon Q3, controllable silicon Q5 colelctor electrode be connected, 2 feet of three phase inverter bridge 3 and controllable silicon Q2, controllable silicon Q4, controllable silicon Q6 emitter stage be connected, the emitter stage of controllable silicon Q1 is connected with the colelctor electrode of controllable silicon Q2, the emitter stage of controllable silicon Q3 is connected with the colelctor electrode of controllable silicon Q4, and the emitter stage of controllable silicon Q5 is connected with the colelctor electrode of controllable silicon Q6.3 feet of three phase inverter bridge 3 are connected with the colelctor electrode of the emitter stage of controllable silicon Q1, controllable silicon Q2,4 feet of three phase inverter bridge 3 are connected with the colelctor electrode of the emitter stage of controllable silicon Q3, controllable silicon Q4, and 5 feet of three phase inverter bridge 3 are connected with the colelctor electrode of the emitter stage of controllable silicon Q5, controllable silicon Q6.
Fig. 5 is the peripheral circuit diagram of three phase inverter bridge IPM module, its annexation is as follows :+15V and resistance R9, electric capacity C4 and 2 feet of three phase inverter bridge IPM module 16,8 feet are connected, the other end of resistance R9 is connected with the anode of diode D6, the negative electrode of diode D6, the negative electrode of diode D9, the positive pole of electric capacity C5 and electric capacity C6 are connected with 2 feet of three phase inverter bridge IPM module 16, and the anode of diode D9, the negative pole of electric capacity C5 and the other end of electric capacity C6 are connected with 1 foot of 23 feet of three phase inverter bridge IPM module 16, output voltage terminal 17.+ 15V is connected with resistance R10, the other end of resistance R10 is connected with the anode of diode D7, the negative electrode of diode D7, the negative electrode of diode D10, the positive pole of electric capacity C7 and electric capacity C8 are connected with 3 feet of three phase inverter bridge IPM module 16, and the anode of diode D10, the negative pole of electric capacity C7 and the other end of electric capacity C8 are connected with 2 feet of 22 feet of three phase inverter bridge IPM module 16, output voltage terminal 17.+ 15V is connected with resistance R11, the other end of resistance R11 is connected with the anode of diode D8, the negative electrode of diode D8, the negative electrode of diode D11, the positive pole of electric capacity C9 and electric capacity C10 are connected with 4 feet of three phase inverter bridge IPM module 16, and the anode of diode D11, the negative pole of electric capacity C9 and the other end of electric capacity C10 are connected with 3 feet of 21 feet of three phase inverter bridge IPM module 16, output voltage terminal 17.+ 15V is connected with the positive pole of electric capacity C12, electric capacity C11, the negative electrode of diode D12 and 13 feet of three phase inverter bridge IPM module 16, the negative pole of electric capacity C12, the anode of diode D12, the other end of electric capacity C11 and 16 feet of three phase inverter bridge IPM module 16,17 feet are connected with GND, VCC is connected with resistance R12, the other end of resistance R12 is connected with 14 feet of PRO port, three phase inverter bridge IPM module 16, the positive pole of electric capacity C13 and 24 feet of 20, VDC+ port connect, and the negative pole of electric capacity C13 is connected with 20 feet of three phase inverter bridge IPM module 16, VDC-port.
As shown in Figure 6, wherein, described hall signal includes hall sensor signal HallA, hall sensor signal HallB, hall sensor signal HallC.Wherein 1 represent high level, 0 represents low level, A, B, C represent the three-phase windings of brshless DC motor, Q1-Q6 represents the controllable silicon of three phase inverter bridge, value according to three hall signals of synchronization, control the corresponding silicon controlled conducting of three phase inverter bridge, just can realize the commutation function between brshless DC motor ABC three-phase windings.
nullAs shown in Figure 7，Wherein，9 feet of hall signal port HallA and I's phase inverter 18 in hall sensor signal HallA connect，2 feet of I AND gate 19、8 feet of 4 feet and No. I phase inverter 18 connect，1 foot of I AND gate 19 is connected with hall signal port HALLB，5 feet of I AND gate 19 are connected with hall signal port HALLC，3 feet of I AND gate 19 and 9 feet of No. II phase inverter 20 connect，6 feet of I AND gate 19 and 1 foot of No. II phase inverter 20 connect，8 feet of No. II phase inverter 20 and 4 feet of II AND gate 21 connect，2 feet of No. II phase inverter 20 and 9 feet of II AND gate 21 connect，5 feet of II AND gate 21 and 8 feet of I AND gate 19 connect，10 feet of II AND gate 21 and 8 feet of IV AND gate 23 connect，6 feet of II AND gate 21 are connected with resistance R14，8 feet of II AND gate 21 are connected with resistance R15，Resistance R14、The other end of resistance R15 is connected with 3.3V.
null11 feet of hall signal port HallB and I's phase inverter 18 in hall sensor signal HallB connect，10 feet of I AND gate 19、10 feet of 12 feet and No. I phase inverter 18 connect，9 feet of I AND gate 19 are connected with hall signal port HALLA，13 feet of I AND gate 19 are connected with hall signal port HALLC，8 feet of I AND gate 19 and 3 feet of No. II phase inverter 20 connect，11 feet of I AND gate 19 and 5 feet of No. II phase inverter 20 connect，4 feet of No. II phase inverter 20 and 12 feet of II AND gate 21 connect，6 feet of No. II phase inverter 20 and 2 feet of II AND gate 21 connect，13 feet of II AND gate 21 and 3 feet of I AND gate 19 connect，1 foot of II AND gate 21 and 11 feet of IV AND gate 23 connect，11 feet of II AND gate 21 are connected with resistance R16，3 feet of II AND gate 21 are connected with resistance R17，Resistance R16、The other end of resistance R17 is connected with 3.3V.
null13 feet of hall signal end HallC and I's phase inverter 18 in hall sensor signal HallC connect，13 feet of IV AND gate 23、12 feet of 9 feet and No. I phase inverter 18 connect，10 feet of IV AND gate 23 are connected with hall signal end HALLA，12 feet of IV AND gate 23 are connected with hall signal end HALLB，8 feet of IV AND gate 23 and 11 feet of No. II phase inverter 20 connect，11 feet of IV AND gate 23 and 13 feet of No. II phase inverter 20 connect，12 feet of No. II phase inverter 20 and 1 foot of III AND gate 22 connect，10 feet of No. II phase inverter 20 and 12 feet of III AND gate 22 connect，13 feet of III AND gate 22 and 6 feet of I AND gate 19 connect，2 feet of III AND gate 22 and 11 feet of I AND gate 19 connect，3 feet of III AND gate 22 are connected with resistance R18，11 feet of III AND gate 22 are connected with resistance R19，Resistance R18、The other end of resistance R19 is connected with 3.3V.
Described voltage and current detection circuit 7 includes current detection circuit and voltage detecting circuit.
nullAs shown in Figure 8，Described current detection circuit includes No. I operational amplifier 24，Resistance R20 connects feedback current FKDL port，The other end and resistance R23、2 feet of electric capacity C15 and operational amplifier 24 connect，Resistance R23、The other end of electric capacity C15 is then connected with 1 foot of No. I operational amplifier 24，Resistance R21 connects GND port，The other end and resistance R22、3 feet of electric capacity C14 and No. I operational amplifier 24 connect，Resistance R22、The other end of electric capacity C14 is connected with AGND，4 feet of No. I operational amplifier 24、11 feet respectively with+15VA、-15VA connects，Resistance R24 and I's operational amplifier 241 foot connects，The other end of resistance R24 and electric capacity C16、Electric capacity C17、The negative electrode of diode D13、The anode of diode D14 connects，Electric capacity C16、The other end of electric capacity C17 and the anode of diode D13 are connected with AGND，The negative electrode of diode D14 is then connected with 3.3VA.
nullAs shown in Figure 9，Described voltage detecting circuit includes No. II operational amplifier 25，Resistance R26 connects feedback voltage FKDY port，The other end connects with 3 feet of resistance R28 and No. II operational amplifier 25，The other end of resistance R28 is connected with AGND，Resistance R25 connects GND port，The other end connects with 2 feet of resistance R27 and No. II operational amplifier 25，The other end of resistance R27 is connected with 1 foot of resistance R29 and No. II operational amplifier 25，The resistance R29 other end is connected with 5 feet of resistance R32 and No. II operational amplifier 25，The resistance R32 other end is connected with AGND，4 feet of No. II operational amplifier 25、11 feet respectively with+15VA、-15VA connects，6 feet of No. II operational amplifier 25 and resistance R30、Resistance R31 connects，The other end of resistance R30 is connected with AGND，The other end of resistance R31 then with 7 feet of No. II operational amplifier 25、Electric capacity C18、Electric capacity C19、The negative electrode of diode D15、The anode of diode D16 connects，Electric capacity C18、The other end of electric capacity C19 and the anode of diode D15 are connected with AGND，The negative electrode of diode D16 is connected with 3.3VA.
nullAs shown in Figure 10，Described protection circuit 8 includes comparator 26、V AND gate 27、No. III phase inverter 28，Feedback voltage FKDY port is connected with 6 feet of comparator 26，Feedback current FKDL port is connected with 2 feet of comparator 26，5 feet of+3.3VA and comparator 26、3 feet connect，7 feet of resistance R33 and comparator 26、4 feet of V AND gate 27 connect，1 foot of resistance R34 and comparator 26、5 feet of V AND gate 27 connect，Resistance R33、The other end of resistance R34 is connected with VCC，1 foot of the negative electrode of diode D18 and No. III phase inverter 28、6 feet of V AND gate 27 connect，The anode of diode D18 is connected with VCC，2 feet of No. III phase inverter 28 are connected with resistance R35，The other end of resistance R35 is connected with+3.3V.
Described Buck changer 2 is a kind of voltage-dropping type DC/DC converting means, and fixing DC voltage conversion becomes the DC voltage that output is variable, and it is made up of controllable silicon, driving signaling module, fly-wheel diode and LC filter circuit.DC power anode is connected with silicon controlled colelctor electrode, and silicon controlled emitter stage connects with fly-wheel diode negative electrode, and the anode of diode connects with power cathode.
The pwm signal that DSP panel 6 generates drives module 10 to generate positive and negative two-way through PWM and drives signal to be connected with the base stage of Fig. 2 controllable silicon T1, emitter stage respectively, controllable silicon T1 is carried out PWM.LC filter circuit also connects the two ends with fly-wheel diode, is filtered just generating the DC voltage of smooth steady to the voltage after modulation, is regulated the dutycycle of pwm signal by DSP, just can control the size of output DC voltage.
Described three phase inverter bridge 3 is used for realizing motor commutation, its structural principle is as shown in Figure 4, three phase inverter bridge is made up of six controllable silicon Q1-Q6 of three brachium pontis, the controllable silicon of upper brachium pontis is Q1, Q3, Q5, the controllable silicon of lower brachium pontis is Q2, Q4, Q6, wherein Q1 and Q2 constitutes a brachium pontis, and Q3 and Q4 constitutes a brachium pontis, and Q5 and Q6 constitutes a brachium pontis.
That in this utility model, three-phase inversion bridge module is selected is Mitsubishi the 4th generation SPM (IPM) PS21964; power chip, driving and protection circuit are integrated in same module by it; module volume is little; rated capacity is big; being easily applied in the VFC of low-power machine, peripheral circuit is simple simultaneously, it is not necessary to optocoupler or transformer isolation; directly the pwm signal of DSP can be connected to power model, convenient application.
Described hardware commutation circuit 7 has been used for hall sensor signal and has driven the conversion of signal to three phase inverter bridge, owing to the commutation moment of brshless DC motor is determined by position signalling, the position signalling of motor is obtained by three Hall element detections, three Hall elements are looped around peritrochanteric, spatially 120 ° of interval, under rotor field acts on, Hall element produces the pulsewidth high level signal of 180 °, the output signal of three Hall elements mutual deviation 120 ° in phase place, each cycle has 6 rising edges or trailing edge, 6 commutation moment of corresponding motor respectively, therefore the value according to three hall signals, drive corresponding inverter bridge reverse-blocking tetrode thyristor pipe, just the correct commutation of motor can be realized.There is following logical relation in the driving signal of three phase inverter bridge switching tube and hall signal:
In above formula, HallA, HallB, HallC represent the signal that Hall element produces, and hall signal inverse value is used、、Representing, owing to hall signal is the pulse width signal of low and high level, therefore its value is 0 or 1.G1-G6 represents the driving signal of the bridge silicon controlled Q1-Q6 of three-phase inversion, drive signal to be multiplied by any one of a hall signal value and other two anti-phase hall signal values to obtain, when drive signal value is high level 1, controlled silicon conducting, when drive signal value is low level 0, controllable silicon turns off.
Commutation circuit design is carried out according to above-mentioned logical relation, hardware commutation circuit is made up of logic chip, hall signal HallA, HallB, HallC are connected generation inversion signal respectively with phase inverter, any one anti-phase hall signal respectively with two other hall signal through becoming the driving signal of two switching tubes with pupil.The signal that drives of each switching tube interlocks with another switching tube driving inverted device of signal of same brachium pontis and the interlock circuit of door composition, to prevent two switching tubes from simultaneously turning on, cause dc bus short circuit, signal after interlocking is drawn high then through external voltage and is converted to the level driving signal, drive the corresponding switching tube of three phase inverter bridge, it is achieved the correct commutation of motor.
Described touch screen 9 selects 7 cun of touch screens of the Kunlun, Beijing on-state company, and model is TPC7062K, and this touch screen is powered by 24V DC source, adopts RS232 mode and DSP communication, is integrated with the unit such as LCDs, touch panel, control and data storage.Software is divided into running environment picture configuration software and touch screen data communications protocol, and both adopt MCGS to embed version configuration software and script drives developing instrument to write.
Described DSP panel 6 is the control core of whole controller; this patent selects the TMS320F2812 development board of TI company; by driving module, protection circuit and touch screen etc. to be connected with peripheral voltage current detection circuit, PWM, it is achieved functions such as the collection of voltage and current signal, the output of pwm signal, man-machine communication and DC MOTOR CONTROL protections.
Brushless direct current motor controller described in this patent also comprises voltage and current detection circuit and protection circuit.Voltage and current detection circuit is realized by difference amplifier, and the voltage of feedback, current signal scale up through difference amplifier or reduce, and after RC filter circuit filters, within its amplitude being limited in 3.3V then through amplitude limiter circuit, the A/D for DSP gathers.Protection circuit is then contrasted with restriction signal by comparator according to the signal of measure voltage & current, to DSP output protection signal, by software control realization defencive function after DSP reception protection signal.
This utility model adds the control mode of Buck changer before adopting three phase inverter bridge, the commutation of direct current generator separated with speed-regulating function, and is shown by touch screen, regulated the parameter of electric machine, it is achieved that motor is controlled in real time；Regulated by Buck changer, replace original pwm pulse voltage with stable DC voltage, effectively eliminate the discontinuous saltus step of stator current, reduce motor iron loss；Adopt hardware logic commutation circuit to replace software commutation program, decreasing the complexity of DSP program, making DSP be absorbed in the control algolithm of motor, thus improve control efficiency.
Claims (7)
- null1. the high-speed brushless DC electromotor controller based on BUCK changer，Including DC source (1)，It is characterized in that: the anode of DC source (1) is connected with 1 foot of Buck changer (2)，Negative terminal is connected with 2 feet of Buck changer (2)，3 feet of Buck changer (2) are connected with 1 foot of three phase inverter bridge (3)，4 feet of Buck changer (2) are connected with 2 feet of three phase inverter bridge (3) by current sense resistor (11)，4 feet of three phase inverter bridge (3)、5 feet、6 feet in order with the A of brshless DC motor (4)、B、C three-phase windings correspondence connects，Current sense resistor (11) is connected with voltage and current detection circuit (5)，Three phase inverter bridge (3)、Brshless DC motor (4) is all connected with hardware commutation circuit (7)，Buck changer (2) drives module (10) to be connected with PWM，Described voltage and current detection circuit (5)、PWM drives module (10) to be all connected with DSP panel (6)，Described DSP panel (6) also with protection circuit (8)、Touch screen (9) is connected.
- 2. a kind of high-speed brushless DC electromotor controller based on BUCK changer according to claim 1, it is characterized in that: described Buck changer (2) is made up of+50V DC source, controllable silicon T1, diode D1, diode D2, filter inductance group (12) and filter capacitor group (13), the PWM drive signal of controllable silicon T1 is by externally input, resistance R1, electric capacity C1, diode D1 form RCD absorbing circuit, for absorbing the high-frequency signal at controllable silicon T1 two ends, to reduce the switching loss of controllable silicon T1.
- null3. a kind of high-speed brushless DC electromotor controller based on BUCK changer according to claim 1，It is characterized in that: described PWM drives module (10) to include pwm signal driving chip (14)、Optocoupler (15)，2 feet of pwm signal driving chip (14) resistance R2 in parallel、Electric capacity C2 is connected with pwm signal port，3 feet of pwm signal driving chip (14)、5 feet are connected with GND，4 feet of pwm signal driving chip (14) are connected with+15V，4 feet of pwm signal driving chip (14)、5 feet respectively with the positive pole of electric capacity C3、Negative pole is connected，12 feet of pwm signal driving chip (14) successively with Zener diode D3、Diode D4、Diode D5、+ 50V connects，15 feet of pwm signal driving chip (14) successively with resistance R3、GPWM port connects,16 feet of pwm signal driving chip (14) successively with resistance R4、GPWM port connects,17 feet of pwm signal driving chip (14) are connected with EPWM port,13 feet of pwm signal driving chip (14) are connected with 2 feet of optocoupler (15)，18 feet of pwm signal driving chip (14) are connected with 1 foot of optocoupler (15) by resistance R7，1 foot of optocoupler (15)、Resistance R8 it is also associated with between 2 feet.
- 4. a kind of high-speed brushless DC electromotor controller based on BUCK changer according to claim 1, it is characterised in that: described voltage and current detection circuit (7) includes current detection circuit and voltage detecting circuit.
- null5. a kind of high-speed brushless DC electromotor controller based on BUCK changer according to claim 4，It is characterized in that: described current detection circuit includes No. I operational amplifier (24)，Resistance R20 connects feedback current FKDL port，The other end and resistance R23、2 feet of electric capacity C15 and No. I operational amplifier (24) connect，Resistance R23、The other end of electric capacity C15 is then connected with 1 foot of No. I operational amplifier (24)，Resistance R21 connects GND port，The other end and resistance R22、3 feet of electric capacity C14 and No. I operational amplifier (24) connect，Resistance R22、The other end of electric capacity C14 is connected with AGND，4 feet of No. I operational amplifier (24)、11 feet respectively with+15VA、-15VA connects，Resistance R24 and I's operational amplifier (24) 1 foot connects，The other end of resistance R24 and electric capacity C16、Electric capacity C17、The negative electrode of diode D13、The anode of diode D14 connects，Electric capacity C16、The other end of electric capacity C17 and the anode of diode D13 are connected with AGND，The negative electrode of diode D14 is then connected with 3.3VA.
- null6. a kind of high-speed brushless DC electromotor controller based on BUCK changer according to claim 4，It is characterized in that: described voltage detecting circuit includes No. II operational amplifier (25)，Resistance R26 connects feedback voltage FKDY port，The other end connects with 3 feet of resistance R28 and No. II operational amplifier (25)，The other end of resistance R28 is connected with AGND，Resistance R25 connects GND port，The other end connects with 2 feet of resistance R27 and No. II operational amplifier (25)，The other end of resistance R27 is connected with 1 foot of resistance R29 and No. II operational amplifier (25)，The resistance R29 other end is connected with 5 feet of resistance R32 and No. II operational amplifier (25)，The resistance R32 other end is connected with AGND，4 feet of No. II operational amplifier (25)、11 feet respectively with+15VA、-15VA connects，6 feet of No. II operational amplifier (25) and resistance R30、Resistance R31 connects，The other end of resistance R30 is connected with AGND，The other end of resistance R31 then with 7 feet of No. II operational amplifier (25)、Electric capacity C18、Electric capacity C19、The negative electrode of diode D15、The anode of diode D16 connects，Electric capacity C18、The other end of electric capacity C19 and the anode of diode D15 are connected with AGND，The negative electrode of diode D16 is connected with 3.3VA.
- null7. a kind of high-speed brushless DC electromotor controller based on BUCK changer according to claim 1，It is characterized in that: described protection circuit (8) includes comparator (26)、V AND gate (27)、No. III phase inverter (28)，Feedback voltage FKDY port is connected with 6 feet of comparator (26)，Feedback current FKDL port is connected with 2 feet of comparator (26)，5 feet of+3.3VA and comparator (26)、3 feet connect，7 feet of resistance R33 and comparator (26)、4 feet of V AND gate (27) connect，1 foot of resistance R34 and comparator (26)、5 feet of V AND gate (27) connect，Resistance R33、The other end of resistance R34 is connected with VCC，1 foot of the negative electrode of diode D18 and No. III phase inverter (28)、6 feet of V AND gate (27) connect，The anode of diode D18 is connected with VCC，2 feet of No. III phase inverter (28) are connected with resistance R35，The other end of resistance R35 is connected with+3.3V.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655913A (en) * | 2016-12-22 | 2017-05-10 | 哈尔滨工业大学 | Three-phase inverter topology structure with adjustable DC bus voltage and method of adopting structure to realize dynamic DC bus voltage adjustment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106655913A (en) * | 2016-12-22 | 2017-05-10 | 哈尔滨工业大学 | Three-phase inverter topology structure with adjustable DC bus voltage and method of adopting structure to realize dynamic DC bus voltage adjustment |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160727 |