CN103490680A - Driving system and driving method for direct current brushless motor without Hall element - Google Patents
Driving system and driving method for direct current brushless motor without Hall element Download PDFInfo
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- CN103490680A CN103490680A CN201210192518.0A CN201210192518A CN103490680A CN 103490680 A CN103490680 A CN 103490680A CN 201210192518 A CN201210192518 A CN 201210192518A CN 103490680 A CN103490680 A CN 103490680A
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Abstract
The invention provides a driving system and a driving method for a direct current brushless motor without a Hall element. The driving system is formed by a rotor detection circuit, a logic control circuit, a load drive circuit, a back electromotive force detection circuit, a speed parameter generation circuit and a feedback comparison circuit, wherein an adjustable capacitor is additionally arranged outside the rotor detection circuit to increase accuracy of rotor position detection, and an adjustable resistor is additionally arranged outside the speed parameter generation circuit to change the magnitude of first stepping currents when the motor is started to ensure that the motor is smoothly started. Therefore, a good motor starting output expression and better system stability can be achieved.
Description
Technical field
The present invention system is about a kind of drive system and driving method of DC Brushless Motor, particularly, relevant for a kind of drive system and driving method of the d.c. motor without Hall element, so that can reaching good startup output performance and linearisation motor rotary speed, the drive system of the d.c. motor without Hall element of the present invention controls; In the rotor circuit for detecting in drive system, additional one adjustable electric capacity changes the length of detecting time, to increase the precision of detecting rotor-position, and can be again in the speed parameter generative circuit of drive system, an additional trimmable resistance changes the size of current while starting, and to guarantee motor, starts smoothly; So that the drive system of DC Brushless Motor of the present invention and driving method are used on blu-ray drives, general CD-ROM drive or fan.
Background technology
In general, in order to drive DC Brushless Motor to detect the position of motor rotor, all can adopt position transducer to detect, as Hall element (Hall sensor), optical encoder etc., when motor running, obtain suitably commutation signal and normally rotate with CD-ROM drive motor.Yet the use location transducer must be positioned in motor, can make system bulk become large, increase the assembling difficulty and increase system cost, for the trend of current motor miniaturization, position transducer will limit development and the application of motor.
Occupy the volume of system and the difficulty of assembling in order to reduce motor, sensorless DC Brushless Motor technology is widely used in various driving products.The many sensorless DC Brushless Motor drive unit proposed at present, the back electromotive force induced by motor stator (stator) (Back Electromotive Forces, BEMF) is determined position and the commutation of rotor.Yet shortcoming is that the back electromotive force of induction when motor is static does not exist, and can cause the initial position that can't detect motor rotor.
Therefore, the present invention is in without Hall element DC Brushless Motor drive circuit, change the length of detecting time by additional adjustable electric capacity, to increase the precision of detecting rotor-position, simultaneously, also can change the first step size of current while starting by additional trimmable resistance, guarantee that motor normally starts.Without Hall element DC Brushless Motor drive system and driving method, can meet motor load of all kinds via of the present invention, make it reach good motor starting output performance, and reach the preferably stability of a system.
Summary of the invention
In order to address the above problem, it is a kind of without Hall element DC Brushless Motor drive system that a main purpose of the present invention is to provide, in the rotor circuit for detecting of system, additional adjustable electric capacity changes the length of detecting time, to increase the precision of detecting rotor-position, and in the speed parameter generative circuit of system, additional trimmable resistance changes first step size of current while starting, to guarantee that motor starts smoothly, can reach thus good motor starting output performance and the stability of a system preferably.
It is a kind of without Hall element DC Brushless Motor driving method that another main purpose of the present invention is to provide, and by without Hall element DC Brushless Motor driving method, can reach good motor starting output performance and the stability of a system preferably.
It is a kind of without Hall element DC Brushless Motor drive system that another main purpose of the present invention is to provide, by an adjustable electric capacity (C
adj) with the rotor circuit for detecting, be connected, change the time of detecting rotor-position, increase the precision of detecting rotor-position.
A main purpose more of the present invention is providing a kind of without Hall element DC Brushless Motor drive system, by being connected in a sensing resistor (R of load driving circuits
sense), in order to produce a sensing voltage (V
sense), input to rotor circuit for detecting and feedback comparison circuit, produce and output to logic control circuit and then control the output phase conversion.
According to above-mentioned projects, the invention provides a kind ofly without Hall element DC Brushless Motor drive system, comprising: a rotor circuit for detecting, one end and an adjustment electric capacity (C
adj) connect; One logic control circuit, the one end is connected with the rotor circuit for detecting, and the output signal of exporting according to the rotor circuit for detecting produces corresponding three-phase output drive signal (M
u, M
v, M
w); One load driving circuits, the three-phase output drive signal (M of one end andlogic control circuit
u, M
v, M
w) connect, and produce three-phase output voltage (V
u, V
v, V
w) and an output current (I
l), in order to drive the three-phase direct-current brushless revolution, and the other end of load driving circuits connects a sensing resistor (R
sense), in order to produce a sensing voltage (V
sense), and by this sensing voltage (V
sense) input to the rotor circuit for detecting; One back electromotive force circuit for detecting, the one end is connected with three-phase central point (Com) feedback with the three-phase coil (U, V, W) in the three-phase direct-current brushless motor, and an end of its other end andlogic control circuit connects; One speed parameter generative circuit, the one termination is received a starting switch signal (V of logic control circuit
ss), and according to an input signal (V
input) and a reference potential signal (V
ref) difference, produce a speed control voltage (V
sc), and its other end connects an adjusting resistance (R
adj); And a feedback comparison circuit, its input and sensing voltage (V
sense) and speed control voltage (V
sc) connect, according to sensing voltage (V
sense) and speed control voltage (V
sc) make comparisons, produce an excess current control signal (V
oc) be input to logic control circuit.
The invention provides a kind ofly without Hall element DC Brushless Motor driving method, comprising: a three-phase direct-current brushless motor is provided; One rotor-position of detecting three-phase direct-current brushless motor, utilize a rotor circuit for detecting to detect the rotor-position of three-phase direct-current brushless motor, and an output signal of exporting according to the rotor circuit for detecting give a logic control circuit corresponding three-phase output drive signal (M
u, M
v, M
w); Driving the three-phase direct-current brushless motor, is by three-phase output drive signal (M
u, M
v, M
w) input to a load driving circuits, produce three-phase output voltage (V
u, V
v, V
w) with an output current (IL) to drive the three-phase direct-current brushless motor; Adjust the detecting time, utilize a sensing resistor (R who is connected in load driving circuits one end
sense) sensing voltage (V that produces
sense), make the rotor circuit for detecting pass through to adjust electric capacity (C before the three-phase direct-current brushless motor starting
adj) change time of detecting rotor-position; And the variation of detecting back electromotive force, to utilize a back electromotive force circuit for detecting, detect a back electromotive force according to the three-phase coil (U, V, W) of three-phase direct-current brushless motor with three-phase motor central point (Com) feedback and change, produce output result is to the phse conversion of logic control circuit and then control three-phase direct-current brushless motor.
It is a kind of without Hall element DC Brushless Motor drive system that the present invention provides again, comprise: a rotor circuit for detecting, the one end is connected with a logic control circuit, and logic control circuit produces corresponding three-phase output drive signal (M according to the output signal of rotor circuit for detecting
u, M
v, M
w), a load driving circuits, the three-phase output drive signal of one end andlogic control circuit connects, and produces three-phase output voltage (V
u, V
v, V
w) and an output current (I
l), in order to drive the three-phase direct-current brushless revolution, one back electromotive force circuit for detecting, the one end is connected with three-phase motor central point (Com) feedback with the three-phase coil (U, V, W) in the three-phase direct-current brushless motor, and an end of its other end andlogic control circuit connects, one speed parameter generative circuit, the one termination is received a starting switch signal (V of logic control circuit
ss), and according to an input signal (V
input) and a reference potential signal (V
ref) difference, produce a speed control voltage (V
sc), and a feedback comparison circuit, its input and load driving circuits and speed control voltage (V
sc) connect, produce an excess current control signal (V
oc) be input to logic control circuit, wherein without Hall element DC Brushless Motor drive system, be characterised in that: an adjustable electric capacity (C
adj) with the rotor circuit for detecting, be connected, change the time of detecting rotor-position by adjustable electric capacity.
It is a kind of without Hall element DC Brushless Motor drive system that the present invention then provides again, comprise: a rotor circuit for detecting, the one end is connected with a logic control circuit, and logic control circuit produces corresponding three-phase output drive signal (M according to the output signal of rotor circuit for detecting
u, M
v, M
w), a load driving circuits, the three-phase output drive signal of one end andlogic control circuit connects, and produces three-phase output voltage (V
u, V
v, V
w) and an output current (I
l), in order to drive the three-phase direct-current brushless revolution, one back electromotive force circuit for detecting, the one end is connected with three-phase motor central point (Com) feedback with the three-phase coil (U, V, W) in the three-phase direct-current brushless motor, and an end of its other end andlogic control circuit connects, one speed parameter generative circuit, the one termination is received a starting switch signal (V of logic control circuit
ss), and according to an input signal (V
input) and a reference potential signal (V
ref) difference, produce a speed control voltage (V
sc), and a feedback comparison circuit, its input and speed control voltage (V
sc) connect, wherein without Hall element DC Brushless Motor drive system, be characterised in that: the other end of load driving circuits connects a sensing resistor (R
sense), in order to produce a sensing voltage (V
sense), and by sensing voltage (V
sense) input to rotor circuit for detecting and feedback comparison circuit, according to sensing voltage (V
sense) and speed control voltage (V
sc) make comparisons, produce an excess current control signal (V
oc) be input to logic control circuit.
Via provided by the present invention without Hall element DC Brushless Motor drive system and method, pass through additional adjustable electric capacity and resistance in circuit, increase the precision of detecting rotor-position and guarantee that motor starts smoothly, to meet motor load of all kinds, and reach the preferably stability of a system.
The accompanying drawing explanation
Because the present invention discloses a kind of drive system without the Hall element DC Brushless Motor and driving method, in the rotor circuit for detecting, additional adjustable electric capacity changes the length of detecting time, to increase the precision of detecting rotor-position, and again in the speed parameter generative circuit of system, additional trimmable resistance changes first step size of current while starting, and to guarantee motor, starts smoothly, can reach thus good motor starting output performance and the stability of a system preferably.Wherein, basic principle and function without the Hall element DC Brushless Motor, for having, correlative technology field usually knows that the knowledgeable can understand, therefore with explanation hereinafter, only for being elaborated without Hall element DC Brushless Motor drive system and its feature place of method with the present invention.In addition, the accompanying drawing in following interior literary composition, also not according to the actual complete drafting of relative dimensions, its effect is only being expressed the schematic diagram relevant with feature of the present invention, wherein:
Fig. 1 is without Hall element DC Brushless Motor drive system calcspar for of the present invention;
Fig. 2 is to be the Organization Chart of the rotor circuit for detecting without Hall element DC Brushless Motor drive system of the present invention;
Fig. 3 is to be rotor-position of the present invention and six phase phase current graphs of a relation;
Fig. 4 is to be the Organization Chart of the speed parameter generative circuit without Hall element DC Brushless Motor drive system of the present invention;
Fig. 5 is without Hall element DC Brushless Motor driving method flow chart for of the present invention.
Embodiment
At first, referring to Fig. 1, is without Hall element DC Brushless Motor drive system calcspar for of the present invention.As shown in Figure 1, without Hall element DC Brushless Motor drive system, comprise: a rotor circuit for detecting 10, one end and is adjusted electric capacity (C
adj) 101 connections; One logic control circuit 20, the one end is connected with rotor circuit for detecting 10, and produces corresponding three-phase output drive signal (M according to the output signal of rotor circuit for detecting 10
u, M
v, M
w); One load driving circuits 30, the three-phase output drive signal of one end andlogic control circuit 20 connects, and produces three-phase output voltage (V
u, V
v, V
w) and an output current (I
l), in order to drive three-phase direct-current brushless motor 40, rotate, and the other end of load driving circuits 30 connects a sensing resistor (R
sense) 301, in order to produce a sensing voltage (V
sense), and by this sensing voltage (V
sense) input to rotor circuit for detecting 10; One back electromotive force circuit for detecting 50, the one end is connected with three-phase motor central point (Com) feedback with the three-phase coil (U, V, W) in the three-phase direct-current brushless motor, and an end of its other end andlogic control circuit 20 connects; One speed parameter generative circuit 60, the one termination is received a starting switch signal (V of logic control circuit 20
ss), and according to an input signal (V
input) and a reference potential signal (V
ref) difference, produce a speed control voltage (V
sc), and its other end connects an adjusting resistance (R
adj) 601; And a feedback comparison circuit 70, its input and sensing voltage (V
sense) and speed control voltage (V
sc) connect, according to sensing voltage (V
sense) and speed control voltage (V
sc) make comparisons, produce an excess current control signal (V
oc) be input to logic control circuit 20.
Before three-phase direct-current brushless motor 40 starts, rotor circuit for detecting 10 is according to sensing voltage (V
sense) detect the position of rotor and export logic control circuit 20 to, in order to reach the accuracy of detecting rotor-position, in rotor circuit for detecting 10 additional, adjust the time that electric capacity 101 is adjusted detecting; After three-phase direct-current brushless motor 40 starts, feedback comparison circuit 70 can be according to sensing voltage (V
sense) with the output voltage (V of speed parameter generative circuit 60
sc) make comparisons, and optionally in speed parameter generative circuit 60 an additional adjusting resistance (R again
adj) 601, starting rear first step size of current in order to adjust, to guarantee motor 40, can normally start; Afterwards, produce an excess current control signal (V by feedback comparison circuit 70
oc), and be input to logic control circuit 20, in order to control the speed of three-phase direct-current brushless motor 40.Then, three-phase direct-current brushless motor 40 can be according to the curent change on motor coil, produce back electromotive force and be input to back electromotive force circuit for detecting 50, and back electromotive force circuit for detecting 50 detects the back electromotive force variation according to three-phase coil (U, V, W) and three-phase motor central point (Com), finally the variable quantity of detected reaction gesture is outputed to logic control circuit 20, in order to control the conversion of motor 40 output phases.
Then, referring to Fig. 2, is to be the Organization Chart of the rotor circuit for detecting without Hall element DC Brushless Motor drive system of the present invention.As shown in Figure 2, rotor circuit for detecting 10 comprises: a voltage transitions current circuit 102, its input and sensing voltage (V
sense) connect, wherein, sensing voltage (V
sense) be by the three-phase output drive signal (M with being connected logic control circuit 20
u, M
v, M
w) output current (I that exports through load driving circuits 30
sense) sensing resistor of flowing through (R
sense) 301 produce; And the output of voltage transitions current circuit 102 and a sample resistance (R
sample) 104 connections, and produce a sampling voltage (V
sample); One concussion frequency generating circuit 116, it is according to adjusting electric capacity (C
adj) 101 produce clock signals to logic control circuit 20; One first control switch S
1, giving conducting according to the clock signal of logic control circuit 20 outputs, the one end is connected with sampling voltage 104, and its other end and one first capacitor C
1connect; One second control switch S
2, giving conducting according to the clock signal of logic control circuit 20 outputs, the one end is connected with sampling voltage 104, and its other end and one second capacitor C
2connect; One comparator 114, it is by the first capacitor C
1with the second capacitor C
2make comparisons, produce an output comparison signal to logic control circuit 20, and start the first control switch S according to the clock signal of exporting by logic control circuit 20
1with the second control switch S
2.
Further describe, rotor circuit for detecting 10 gives six kinds of output phases to load driving circuits 30 according to logic control circuit 20, and produces maximum phase output current (I
sense) to sensing resistor (R
sense), to produce a sensing voltage (V
sense), then produce and output current to sample resistance (R by voltage transitions current circuit 102
sample) 104, to produce sampling voltage (V
sample).Afterwards, via the control of logic control circuit 20, first deposit individually the sampling voltage of the first two phase place in first capacitor C
1with the second capacitor C
2, re-use afterwards comparator 114 and carry out the comparison of voltage, produce an output comparison signal and export logic control circuit 20 to; Now, concussion frequency generating circuit (Crystal Oscillator, OSC) 116 also can provide a clock signal to logic control circuit 20, logic control circuit 20 can, according to the clock signal of concussion frequency generating circuit 116, give the first control switch S of rotor circuit for detecting 10
1with the second control switch S
2the time of required conducting; Simultaneously, logic control circuit 20 can be according to the output comparison signal of comparator 114, the switch opens that sampling voltage is little is in order to sample the voltage of next phase place, in this way after six mutually different output phases, to find out the phase place that produces maximum current, and according to this phase place more last phase place and a rear phase place size so that determine suitable output startup phase place.In addition, in concussion frequency generating circuit 116 additional, adjust electric capacity 101, control the time of the clock signal of concussion frequency generating circuit to logic control circuit 20, can increase the time of detecting rotor-position, to improve the precision of circuit for detecting.
Following, refer to Fig. 3, is to be rotor-position of the present invention and six phase phase current graphs of a relation.As shown in Figure 3, the three-phase direct-current brushless motor has the three-phase coil of U phase, V phase, W phase, and rotor circuit for detecting 10 gives six kinds of output phases according to the rotor different angles; For example, take 60 degree during as an anglec of rotation switching benchmark, can measure from U and flow through mutually W phase (path 1), from U, flow through mutually V phase (path 2), from W, flow through mutually V phase (path 3), from W, flow through mutually U phase (path 4), from V, flow through mutually U phase (path 5), flow through mutually the electric current in six paths such as W phase (path 6) from V, and then the position of decision rotor, it is as shown in table 1 that correspondence flows through three-phase coil (U, V, W) current relationship:
Table 1: three-phase coil (U, V, W) current relationship table
| Rotor phase | 1 | 2 | 3 | 4 | 5 | 6 |
| U | H | H | Z | L | L | Z |
| V | Z | L | L | Z | H | H |
| W | L | Z | H | H | Z | L |
According to this three-phase coil (U, V, W) current relationship table, wherein H represents high potential, L represents electronegative potential, Z represents phase of impedance, have six kinds of output phases, according to electric current, be to flow to by high potential the suitable phase place that the electronegative potential characteristic decides output, for example: rotor phase 1 represents that electric current flows through W phase (as path Fig. 3 1) mutually from U, rotor phase 2 represents that electric current flows through V phase (as path Fig. 3 2) mutually from U, rotor phase 3 represents that electric current flows through V phase (as path Fig. 3 3) mutually from W, rotor phase 4 represents that electric current flows through U phase (as path Fig. 3 4) mutually from W, rotor phase 5 represents that electric current flows through U phase (as path Fig. 3 5) mutually from V, rotor phase 6 represents that electric current flows through W phase (as path Fig. 3 6) mutually from V, current relationship by above six kinds of output phases, can determine the position of rotor.Then, find out the lowest high-current value phase place, now logic control circuit 20 can be according to this phase place size of more last phase place and a rear phase place again, and then determines that suitable output starts phase place, and it is as shown in table 2 that actual rotor is detected action relationships:
Table 2: rotor detecting action relationships table
| Rotor phase | 1 | 2 | 3 | 4 | 5 | 6 |
| U | H | H | Z | L | L | Z |
| V | Z | L | L | Z | H | H |
| W | L | Z | H | H | Z | L |
| State A | Last phase | Maximum | A rear phase | Rear next phase |
According to this rotor detecting action relationships table, wherein H represents that high potential, L represent that electronegative potential, Z represent phase of impedance.At first, six kinds of output phases that rotor circuit for detecting 10 can give according to logic control circuit 20, lowest high-current value phase place in the middle of relatively finding out, and compare again the size of its last phase place and a rear phase place according to this phase place, find out second largest current value phase place, then according to lowest high-current value phase place and second largest current value phase place and then determine that suitable output starts phase place.Its judgement manner of comparison is as described below: after known lowest high-current value phase place, relatively the size of its last phase place and a rear phase place is found out second largest current value phase place, if, when last phase place is greater than a rear phase place, start next phase place that phase place is the lowest high-current value phase place; Yet, if when last phase place is less than a rear phase place, starts phase place and be lowest high-current value phase place next phase place afterwards.For instance: when state A, suppose that the lowest high-current value phase place is rotor phase 2, relatively the size of its last phase place and a rear phase place is found out second largest current value phase place, find that its last phase place is greater than a rear phase place, now second largest current value phase place is positioned at rotor phase 1, according to the judgement of lowest high-current value phase place and second largest current value phase place, determine that starting next phase place that phase place is rotor phase 2 is rotor phase 3; Contrary, relatively the size of its last phase place and a rear phase place is found out second largest current value phase place, a phase place after if its last phase place is less than, now second largest current value phase place is positioned at rotor phase 3, according to the judgement of lowest high-current value phase place and second largest current value phase place, determine starting phase place and be next phase place after rotor phase 2 is rotor phase 4.
Please continue to consult Fig. 4, be to be the Organization Chart of the speed parameter generative circuit without Hall element DC Brushless Motor drive system of the present invention.As shown in Figure 4, the speed parameter generative circuit comprises: a starting current control circuit 602, one end and adjusting resistance (R
adj) 601 connections; One first starting switch A, the one termination is received the starting switch signal (V of logic control circuit 20
ss), and its other end is connected with starting current control circuit 602, and export a starting current (I
st) flow to a speed controlling resistance (R
sc) 604, to produce a speed control voltage (V
sc) export feedback comparison circuit 70 to; One voltage transitions current circuit 606, it is according to input signal (V
input) and reference voltage (V
ref) speed that produces controls electric current (I
sc); One second starting switch B, one termination receipts speed is controlled electric current (I
sc), and control electric current (I according to institute's output speed
sc) flow to speed controlling resistance (R
sc) 604, to produce speed control voltage (V
sc) and export feedback comparison circuit 70 to.
When the rotor circuit for detecting determines output phase, from the starting switch signal (V of logic control circuit 20
ss) can switch to the A point, make starting current control circuit 602 output starting current (I
st) to speed controlling resistance (R
sc) 604 generation one speed control voltage (V
sc) export feedback comparison circuit 70 to, then, by its speed control voltage (V
sc) and sensing voltage (V
sense) relatively determine that first step starting current size can normally start to guarantee motor; After motor starting is stable, the starting switch signal of logic control circuit 20 can switch to the B point, now according to input signal (V
input) and reference voltage (V
ref) speed that relatively produces controls electric current (I
sc), the rotating speed of control motor.In addition, in the additional adjusting resistance (R of starting current control circuit 602
adj) 601 can adjust suitable size of current and guarantee that circuit normally starts.
Then, referring to Fig. 5, is without Hall element DC Brushless Motor driving method flow chart for of the present invention.As shown in Figure 5, without Hall element DC Brushless Motor driving method, be to comprise following steps:
Step 1000: a three-phase direct-current brushless motor is provided;
Step 1001: utilize a rotor circuit for detecting, the rotor-position of detecting three-phase direct-current brushless motor, and give a logic control circuit corresponding three-phase output drive signal (M
u, M
v, M
w); Its rotor circuit for detecting one end andlogic control circuit connects, and by an exported output signal and corresponding three-phase output drive signal (M
u, M
v, M
w) reach logic control circuit, then enter step 1002.
Step 1002: input three-phase output drive signal (M
u, M
v, M
w) to a load driving circuits, produce three-phase output voltage (V
u, V
v, V
w) and an output current (I
l) to drive the three-phase direct-current brushless motor; The one end is connected with load driving circuits, and by its three-phase output drive signal (M
u, M
v, M
w) reach load driving circuits, produce three-phase output voltage (V
u, V
v, V
w) and an output current (I
l) to drive the three-phase direct-current brushless motor, then enter step 1003.
Step 1003: a sensing voltage (V who utilizes the sensing resistor (Rsense) be connected in load driving circuits one end to produce
sense), make the rotor circuit for detecting pass through to adjust electric capacity (C before the three-phase direct-current brushless motor starting
adj) increase time of detecting rotor-position; Its sensing voltage (V
sense) by the sub-circuit for detecting detecting of correspondence input revolution rotor-position, and, in order to reach the accuracy of detecting rotor-position, in rotor circuit for detecting additional, adjust electric capacity (C
adj) adjust the detecting time, then enter step 1004.
Step 1004: optionally utilize a feedback comparison circuit, by sensing voltage (V
sense) speed control voltage (V that exports with a speed parameter generative circuit
sc) make comparisons, produce an excess current control signal (V
oc), be input to the speed of logic control circuit and then control three-phase direct-current brushless motor, and pass through an adjusting resistance (R
adj) adjust to start after first step size of current to guarantee motor, normally start; After the three-phase direct-current brushless motor starting, the feedback comparison circuit can be according to sensing voltage (V
sense) with the output voltage (V of speed parameter generative circuit
sc) make comparisons, and in the additional adjusting resistance (R of speed parameter generative circuit
adj) guarantee that with first step size of current after adjusting startup motor normally starts, produce afterwards an excess current control signal (V
oc) be input to logic control circuit and then control the speed of three-phase direct-current brushless motor, finally enter step 1005.
Step 1005: utilize a back electromotive force circuit for detecting, detect a back electromotive force according to the three-phase coil (U, V, W) of three-phase direct-current brushless motor with three-phase central point (Com) feedback and change, produce output result is to the phse conversion of logic control circuit and then control three-phase direct-current brushless motor; Its three-phase direct-current brushless motor can be according to the curent change on motor coil, produce back electromotive force and be input to the back electromotive force circuit for detecting, the back electromotive force circuit for detecting changes according to three-phase coil (U, V, W) and three-phase motor central point (Com) detecting back electromotive force, finally the variable quantity of detected reaction gesture is outputed to logic control circuit, in order to control the conversion of motor output phase.
In addition, be stressed that, its rotor circuit for detecting is identical with Fig. 4 with earlier figures 2 with speed parameter generative circuit structure composed and correlation function, does not repeat them here.
Although the present invention discloses as above with aforesaid preferred embodiment; so it is not in order to limit the present invention; anyly have the knack of alike operator; without departing from the spirit and scope of the present invention; therefore when doing a little change and retouching, scope of patent protection of the present invention must be looked being as the criterion that the claim scope defines.
Claims (12)
1. one kind without Hall element DC Brushless Motor drive system, comprising:
One rotor circuit for detecting, one end and is adjusted electric capacity and is connected;
One logic control circuit, the one end is connected with this rotor circuit for detecting, and produces corresponding three-phase output drive signal according to the output signal of this rotor circuit for detecting;
One load driving circuits, the one end is connected with this three-phase output drive signal of this logic control circuit, and generation three-phase output voltage and an output current, in order to drive the three-phase direct-current brushless revolution, and the other end of load driving circuits connects a sensing resistor, in order to produce a sensing voltage, and this sensing voltage is inputed to this rotor circuit for detecting;
One back electromotive force circuit for detecting, the one end is connected with the feedback of three-phase motor central point with the three-phase coil in this three-phase direct-current brushless motor, and its other end is connected with an end of this logic control circuit;
One speed parameter generative circuit, the one termination is received a starting switch signal of this logic control circuit, and, according to the difference of an input signal and a reference potential signal, produce a speed control voltage, and its other end connects an adjusting resistance; And
One feedback comparison circuit, its input is connected with this speed control voltage with this sensing voltage, according to sensing voltage and speed control voltage, makes comparisons, and produces an excess current control signal and is input to this logic control circuit.
2. according to claim 1 without Hall element DC Brushless Motor drive system, wherein this rotor circuit for detecting comprises:
One voltage transitions current circuit, its input is connected with this sensing voltage, wherein, this sensing voltage is flowed through through this output current of this load driving circuits output by this three-phase output drive signal with being connected this logic control circuit, and this sensing resistor produces, and its output is connected with a sample resistance, and produce a sampling voltage;
One concussion frequency generating circuit, the one end connects this adjustment electric capacity and produces a clock signal to this logic control circuit;
One first control switch, this clock signal of exporting according to this logic control circuit gives conducting, and the one end is connected with this sampling voltage, and its other end is connected with one first electric capacity;
One second control switch, this clock signal of exporting according to this logic control circuit gives conducting, and the one end is connected with this sampling voltage, and its other end is connected with one second electric capacity; And
One comparator, it is made comparisons by this first electric capacity and this second electric capacity, produces an output comparison signal to this logic control circuit, and starts this first control switch and this second control switch according to this clock signal of exporting by this logic control circuit.
3. according to claim 1 without Hall element DC Brushless Motor drive system, wherein this speed parameter generative circuit comprises:
One starting current control circuit, the one end is connected with this adjusting resistance;
One first starting switch, the one termination is received this starting switch signal of this logic control circuit, and its other end is connected with this starting current control circuit, and exports a starting current and flow to a speed controlling resistance and export this feedback comparison circuit to produce a speed control voltage;
One voltage transitions current circuit, it produces a speed control electric current according to this input signal and this reference voltage; And
One second starting switch, the one termination is received this speed and is controlled electric current, and is flow to this speed controlling resistance to produce this speed control voltage and to export this feedback comparison circuit to according to this speed control electric current of export.
4. according to claim 1 and 2 without Hall element DC Brushless Motor drive system, wherein this rotor circuit for detecting adjusts by this time that electric capacity changes the detecting rotor-position.
5. described without Hall element DC Brushless Motor drive system according to claim 1 or 3, first step electric current when wherein this speed parameter generative circuit changes this three-phase direct-current brushless motor starting by this adjusting resistance.
6. one kind without Hall element DC Brushless Motor driving method, comprising:
One three-phase direct-current brushless motor is provided;
Detect a rotor-position of this three-phase direct-current brushless motor, utilize a rotor circuit for detecting to detect this rotor-position of this three-phase direct-current brushless motor, and an output signal of exporting according to this rotor circuit for detecting give a logic control circuit corresponding three-phase output drive signal;
Drive this three-phase direct-current brushless motor, this three-phase output drive signal is inputed to a load driving circuits, produce three-phase output voltage and an output current to drive this three-phase direct-current brushless motor;
Adjust the detecting time, a sensing voltage that utilizes the sensing resistor that is connected in this load driving circuits one end to produce, make this rotor circuit for detecting change by this adjustments electric capacity the time of detecting this rotor-position before this three-phase direct-current brushless motor starting; And
The variation of detecting back electromotive force, utilize a back electromotive force circuit for detecting, detect a back electromotive force according to the three-phase coil of this three-phase direct-current brushless motor and the feedback of three-phase central point and change, produce output result is to this logic control circuit and then control the phse conversion of this three-phase direct-current brushless motor.
7. according to claim 6 without Hall element DC Brushless Motor driving method, wherein, after completing this adjustment detecting time, further adjust this adjusting resistance, to adjust first step size of current after this three-phase direct-current brushless motor starting.
8. according to claim 6 without Hall element DC Brushless Motor driving method, wherein this rotor circuit for detecting comprises:
One voltage transitions current circuit, its input is connected with this sensing voltage, wherein, this sensing voltage is flowed through through this output current of this load driving circuits output by this three-phase output drive signal with being connected this logic control circuit, and this sensing resistor produces, and its output is connected with a sample resistance, and produce a sampling voltage;
One concussion frequency generating circuit, the one end connects this adjustment electric capacity and produces a clock signal to this logic control circuit;
One first control switch, this clock signal of exporting according to this logic control circuit gives conducting, and the one end is connected with this sampling voltage, and its other end is connected with one first electric capacity;
One second control switch, this clock signal of exporting according to this logic control circuit gives conducting, and the one end is connected with this sampling voltage, and its other end is connected with one second electric capacity; And
One comparator, it is made comparisons by this first electric capacity and this second electric capacity, produces an output comparison signal to this logic control circuit, and starts this first control switch and this second control switch according to this clock signal of exporting by this logic control circuit.
9. according to claim 6 without Hall element DC Brushless Motor driving method, wherein this speed parameter generative circuit comprises:
One starting current control circuit, the one end is connected with this adjusting resistance;
One first starting switch, the one termination is received this starting switch signal of this logic control circuit, and its other end is connected with this starting current control circuit, and exports a starting current and flow to a speed controlling resistance, to produce a speed control voltage, export this feedback comparison circuit to;
One voltage transitions current circuit, it produces a speed control electric current according to this input signal and this reference voltage; And
One second starting switch, the one termination is received this speed and is controlled electric current, and is flow to this speed controlling resistance according to this speed control electric current of export, to produce this speed control voltage and to export this feedback comparison circuit to.
10. one kind without Hall element DC Brushless Motor drive system, comprise: a rotor circuit for detecting, the one end is connected with a logic control circuit, and this logic control circuit produces corresponding three-phase output drive signal according to the output signal of this rotor circuit for detecting, one load driving circuits, the one end is connected with this three-phase output drive signal of this logic control circuit, and generation three-phase output voltage and an output current, in order to drive the three-phase direct-current brushless revolution, one back electromotive force circuit for detecting, the one end is connected with the feedback of three-phase motor central point with the three-phase coil in this three-phase direct-current brushless motor, and its other end is connected with an end of this logic control circuit, one speed parameter generative circuit, the one termination is received a starting switch signal of this logic control circuit, and according to the difference of an input signal and a reference potential signal, produce a speed control voltage, an and feedback comparison circuit, its input is connected with this speed control voltage with this load driving circuits, produce an excess current control signal and be input to this logic control circuit, wherein this is characterised in that without Hall element DC Brushless Motor drive system:
One adjustable electric capacity is connected with this rotor circuit for detecting, changes the time of detecting rotor-position by this adjustable electric capacity.
11. one kind without Hall element DC Brushless Motor drive system, comprise: a rotor circuit for detecting, the one end is connected with a logic control circuit, and this logic control circuit produces corresponding three-phase output drive signal according to the output signal of this rotor circuit for detecting, one load driving circuits, the one end is connected with this three-phase output drive signal of this logic control circuit, and generation three-phase output voltage and an output current, in order to drive the three-phase direct-current brushless revolution, one back electromotive force circuit for detecting, the one end is connected with the feedback of three-phase motor central point with the three-phase coil in this three-phase direct-current brushless motor, and its other end is connected with an end of this logic control circuit, one speed parameter generative circuit, the one termination is received a starting switch signal of this logic control circuit, and according to the difference of an input signal and a reference potential signal, produce a speed control voltage, an and feedback comparison circuit, its input is connected with this speed control voltage, wherein this is characterised in that without Hall element DC Brushless Motor drive system:
The other end of this load driving circuits connects a sensing resistor, in order to produce a sensing voltage, and this sensing voltage is inputed to this rotor circuit for detecting and this feedback comparison circuit, make comparisons according to sensing voltage and speed control voltage, produce an excess current control signal and be input to this logic control circuit.
12. according to claim 11 without Hall element DC Brushless Motor drive system, it further is connected an adjustable electric capacity with this rotor circuit for detecting, changes the time of detecting rotor-position by this adjustable electric capacity.
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| CN201210192518.0A CN103490680B (en) | 2012-06-12 | 2012-06-12 | Driving system and driving method for direct current brushless motor without Hall element |
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| CN201210192518.0A CN103490680B (en) | 2012-06-12 | 2012-06-12 | Driving system and driving method for direct current brushless motor without Hall element |
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| CN103490680B CN103490680B (en) | 2016-08-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104084934A (en) * | 2014-07-03 | 2014-10-08 | 长沙启科电子有限公司 | Novel intelligent control direct-current brushless electric pick |
| CN113054876A (en) * | 2021-03-17 | 2021-06-29 | 林国尊 | Sensorless brushless DC motor control device and method for ceiling fan |
| CN114204858A (en) * | 2020-08-27 | 2022-03-18 | 茂达电子股份有限公司 | Motor driving circuit and method |
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| CN103490680B (en) | 2016-08-24 |
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