CN103490680B - 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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Abstract
A kind of driving system and driving method for direct current brushless motor without Hall element, it is made up of a rotor circuit for detecting, logic control circuit, load driving circuits, counter electromotive force circuit for detecting, speed parameter generative circuit, feedback comparison circuit, it is wherein to increase the precision of detecting rotor-position in the additional adjustable capacitor of rotor circuit for detecting, and first step size of current, to guarantee that motor starts smoothly, thus can reach the output performance of good motor starting and preferably system stability when the additional trimmable resistance of speed parameter generative circuit changes and starts.
Description
Technical field
Present disclosure generally relates to drive system and the driving method of a kind of DC Brushless Motor, more particularly to
In drive system and the driving method of a kind of d.c. motor without Hall element, so that the nothing of the present invention is suddenly
The drive system of the d.c. motor of your element can reach good startup output performance and linearisation
Motor rotary speed controls；By in the rotor circuit for detecting of drive system, an additional adjustable capacitor is come
Change the length of detecting time, to increase the precision of detecting rotor-position, and also can be then at driving
In the speed parameter generative circuit of dynamic system, electric current when an additional trimmable resistance changes startup is big
Little, to guarantee that motor starts smoothly；So that the drive system of the DC Brushless Motor of the present invention and driving
Method is used on blu-ray drives, general CD-ROM drive or fan.
Background technology
In general, in order to drive the position of DC Brushless Motor detection motor rotor, position can all be used
Put sensor detection, such as Hall element (Hall sensor), optical encoder etc., when motor running,
Obtain suitably commutation signal normally to rotate with driving motor.But, use position sensor to put
It is placed in motor, system bulk can be made to become big, increase assembling difficulty and increase system cost, right
In the trend of current motor miniaturization, position sensor will limit development and the application of motor.
Occupy the volume of system and the difficulty of assembling to reduce motor, it is not necessary to the direct current of sensor without
Brush motor technologies is widely used in various driving product.The many having pointed out at present is without sensor
DC Brushless Motor driving means, the counter electromotive force induced by motor stator (stator)
(Back Electromotive Forces, BEMF) determines position and the commutation of rotor.But,
Shortcoming is that the counter electromotive force of sensing does not exist when motor is static, can cause and cannot detect motor rotor
Initial position.
Therefore, the present invention is in direct current brushless motor without Hall element drive circuit, by additional adjustable
Formula electric capacity changes the length of detecting time, to increase the precision of detecting rotor-position, meanwhile, also
First step size of current during startup can be changed, it is ensured that motor normally opens with additional trimmable resistance
Dynamic.Via the driving system and driving method for direct current brushless motor without Hall element of the present invention, can meet
Motor load of all kinds so that it is reach the output performance of good motor starting, and reach be preferably
System stability.
Summary of the invention
In order to solve the problems referred to above, a main purpose of the present invention is to provide a kind of straight without Hall element
Stream brushless motor drive system, in the rotor circuit for detecting of system, additional adjustable capacitor changes
The length of detecting time, to increase the precision of detecting rotor-position, and in the speed parameter of system
In generative circuit, first step size of current when additional trimmable resistance changes startup, to guarantee motor
Start smoothly, thus can reach good motor starting output performance and preferably system stability.
Another main purpose of the present invention is to provide a kind of direct current brushless motor without Hall element driving side
Method, by direct current brushless motor without Hall element driving method, can reach good motor starting output
Performance and preferably system stability.
The another main purpose of the present invention is to provide a kind of direct current brushless motor without Hall element to drive
System, by an adjustable capacitor (Cadj) be connected with rotor circuit for detecting, change detecting rotor-position
Time, increase detecting rotor-position precision.
Another main purpose of the present invention is providing a kind of direct current brushless motor without Hall element drivetrain
System, by being connected to a sensing resistance (R of load driving circuitssense), in order to produce a sensing voltage
(Vsense), input, to rotor circuit for detecting and feedback comparison circuit, generates output to logic control circuit
And then control output phse conversion.
According to above-mentioned projects, the present invention provides a kind of direct current brushless motor without Hall element to drive
System, including: a rotor circuit for detecting, its one end adjusts electric capacity (C with oneadj) connect；One logic
Control circuit, its one end is connected with rotor circuit for detecting, and according to rotor circuit for detecting exported defeated
Go out signal and produce corresponding three-phase output drive signal (Mu、Mv、Mw)；One load driving circuits,
Its one end and the three-phase output drive signal (M of logic control circuitu、Mv、Mw) connect, and produce three
Phase output voltage (Vu、Vv、Vw) export electric current (I with oneL), in order to drive three-phase direct-current brushless motor to turn
Dynamic, and the other end of load driving circuits connects a sensing resistance (Rsense), in order to produce a sensing electricity
Pressure (Vsense), and this is sensed voltage (Vsense) input to rotor circuit for detecting；One counter electromotive force detecting
Circuit, its one end respectively with the three-phase coil (U, V, W) in three-phase direct-current brushless motor and three-phase
Central point (Com) feedback connects, and its other end is connected with one end of logic control circuit；One speed
Parameter generative circuit, one end receives an activate switch signal (V of logic control circuitss), and according to
One input signal (VInput) and a reference potential signal (VRef) difference, produce one speed controlling electricity
Pressure (Vsc), and its other end connects an adjustment resistance (Radj)；And a feedback comparison circuit, it is defeated
Enter end and sensing voltage (Vsense) and speed control voltage (Vsc) connect, according to sensing voltage (Vsense)
With speed control voltage (Vsc) make comparisons, produce an excess current control signal (Voc) it is input to logic control
Circuit.
The present invention provides a kind of direct current brushless motor without Hall element driving method, including: provide one or three
Phase DC Brushless Motor；One rotor-position of detecting three-phase direct-current brushless motor, utilizes a rotor detecting
Circuit detects the rotor-position of three-phase direct-current brushless motor, and exported according to rotor circuit for detecting
One output signal gives the three-phase output drive signal (M that a logic control circuit is correspondingu、Mv、Mw)；
Drive three-phase direct-current brushless motor, be by three-phase output drive signal (Mu、Mv、Mw) input is to one negative
Carry drive circuit, produce three-phase output voltage (Vu、Vv、Vw) export electric current (IL) to drive three with one
Phase DC Brushless Motor；Adjust the detecting time, utilize the sensing being connected to load driving circuits one end
Resistance (RsenseA sensing voltage (V produced by)sense) so that rotor circuit for detecting in three-phase dc without
By adjusting electric capacity (C before brush motor startingadj) change the time detecting rotor-position；And detecting is anti-
The change of electromotive force, is to utilize a counter electromotive force circuit for detecting, according to the three of three-phase direct-current brushless motor
A counter electromotive force change is detected in phase coil (U, V, W) and three-phase motor central point (Com) feedback, produces
The raw phse conversion outputting results to logic control circuit and then controlling three-phase direct-current brushless motor.
The present invention reoffers a kind of direct current brushless motor without Hall element drive system, including: a rotor
Circuit for detecting, its one end is connected with a logic control circuit, and logic control circuit is detected according to rotor
The output signal of circuit produces corresponding three-phase output drive signal (Mu、Mv、Mw), a load is driven
Galvanic electricity road, its one end is connected with the three-phase output drive signal of logic control circuit, and it is defeated to produce three-phase
Go out voltage (Vu、Vv、Vw) export electric current (I with oneL), in order to drive three-phase direct-current brushless revolution,
One counter electromotive force circuit for detecting, its one end respectively with in three-phase direct-current brushless motor three-phase coil (U,
V, W) and three-phase motor central point (Com) feedback connection, and its other end and logic control circuit
One end connects, a speed parameter generative circuit, and one end receives an activate switch of logic control circuit
Signal (Vss), and according to an input signal (VInput) and a reference potential signal (VRef) difference,
Produce a speed control voltage (Vsc), and a feedback comparison circuit, its input drives with load
Circuit and speed control voltage (Vsc) connect, produce an excess current control signal (Voc) it is input to logic control
Circuit processed, wherein direct current brushless motor without Hall element drive system is characterised by: an adjustable electric
Hold (Cadj) be connected with rotor circuit for detecting, by adjustable capacitor change detecting rotor-position time
Between.
The present invention then reoffers a kind of direct current brushless motor without Hall element drive system, including: one
Rotor circuit for detecting, its one end is connected with a logic control circuit, and logic control circuit is according to rotor
The output signal of circuit for detecting produces corresponding three-phase output drive signal (Mu、Mv、Mw), one is negative
Carrying drive circuit, its one end is connected with the three-phase output drive signal of logic control circuit, and produces three
Phase output voltage (Vu、Vv、Vw) export electric current (I with oneL), in order to drive three-phase direct-current brushless motor to turn
Dynamic, a counter electromotive force circuit for detecting, its one end respectively with the three-phase coil in three-phase direct-current brushless motor
(U, V, W) and three-phase motor central point (Com) feedback connect, and its other end and logic control electricity
The one end on road connects, a speed parameter generative circuit, and one end receives a startup of logic control circuit
Switching signal (Vss), and according to an input signal (VInput) and a reference potential signal (VRef) difference
Value, produces a speed control voltage (Vsc), and a feedback comparison circuit, its input and speed
Control voltage (Vsc) connect, wherein direct current brushless motor without Hall element drive system is characterised by:
The other end of load driving circuits connects a sensing resistance (Rsense), in order to produce a sensing voltage
(Vsense), and will sensing voltage (Vsense) input to rotor circuit for detecting and feedback comparison circuit, according to
Sensing voltage (Vsense) and speed control voltage (Vsc) make comparisons, produce an excess current control signal (Voc)
It is input to logic control circuit.
Via direct current brushless motor without Hall element drive system provided by the present invention and method, in circuit
In by additional adjustable capacitor and resistance, increase the precision of detecting rotor-position and guarantee horse
Reach startup smoothly, to meet motor load of all kinds, and reach preferably system stability.
Accompanying drawing explanation
Mainly disclose due to the present invention drive system of a kind of direct current brushless motor without Hall element with
Driving method, is in rotor circuit for detecting, and additional adjustable capacitor changes the length of detecting time,
To increase the precision of detecting rotor-position, and in the speed parameter generative circuit of system, outward
First step size of current when adding trimmable resistance to change startup, to guarantee that motor starts smoothly, thus
The output performance of good motor starting and preferably system stability can be reached.Wherein, without Hall unit
The ultimate principle of part DC Brushless Motor and function, have usually intellectual institute for correlative technology field
Can understand, therefore with following description, drive only for direct current brushless motor without Hall element of the present invention
It is described in detail at dynamic its feature of System and method for.Additionally, the accompanying drawing in following interior literary composition, the most also
Completely not drawing according to actual relative dimensions, its effect is only expressing show relevant with feature of present invention
It is intended to, wherein:
Fig. 1 is the direct current brushless motor without Hall element drive system block chart for the present invention；
Fig. 2 is the rotor circuit for detecting of the direct current brushless motor without Hall element drive system for the present invention
Organization Chart；
Fig. 3 is the rotor-position for the present invention and six phase phase current graphs of a relation；
Fig. 4 is that the speed parameter of the direct current brushless motor without Hall element drive system for the present invention generates
Circuit framework figure；
Fig. 5 is the direct current brushless motor without Hall element driving method flow chart for the present invention.
Detailed description of the invention
First, refer to Fig. 1, be the direct current brushless motor without Hall element drive system for the present invention
Block chart.As it is shown in figure 1, direct current brushless motor without Hall element drive system includes: a rotor is detectd
Slowdown monitoring circuit 10, its one end adjusts electric capacity (C with oneadj) 101 connections；One logic control circuit 20, its
One end is connected with rotor circuit for detecting 10, and produces phase according to the output signal of rotor circuit for detecting 10
Corresponding three-phase output drive signal (Mu、Mv、Mw)；One load driving circuits 30, its one end with patrol
The three-phase output drive signal collecting control circuit 20 connects, and produces three-phase output voltage (Vu、Vv、
Vw) export electric current (I with oneL), in order to drive three-phase direct-current brushless motor 40 to rotate, and load driving
The other end of circuit 30 connects a sensing resistance (Rsense) 301, in order to produce a sensing voltage
(Vsense), and this is sensed voltage (Vsense) input to rotor circuit for detecting 10；One counter electromotive force is detectd
Slowdown monitoring circuit 50, its one end respectively with the three-phase coil (U, V, W) in three-phase direct-current brushless motor and
Three-phase motor central point (Com) feedback connects, and one end of its other end and logic control circuit 20 is even
Connect；One speed parameter generative circuit 60, one end receives an activate switch of logic control circuit 20
Signal (Vss), and according to an input signal (VInput) and a reference potential signal (VRef) difference,
Produce a speed control voltage (Vsc), and its other end connects an adjustment resistance (Radj)601；And
One feedback comparison circuit 70, its input and sensing voltage (Vsense) and speed control voltage (Vsc) even
Connect, according to sensing voltage (Vsense) and speed control voltage (Vsc) make comparisons, produce an excess current control
Signal (Voc) it is 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 (Vsense)
Detect the position of rotor and export to logic control circuit 20, in order to reach to detect rotor-position
Degree of accuracy, adjusts electric capacity 101 in rotor circuit for detecting 10 additional and adjusts the time of detecting；When
After three-phase direct-current brushless motor 40 starts, feedback comparison circuit 70 can be according to sensing voltage (Vsense)
Output voltage (V with speed parameter generative circuit 60sc) make comparisons, and optionally in speed parameter
Generative circuit 60 the most additional one adjusts resistance (Radj) 601, big in order to first step electric current after adjusting startup
Little, to guarantee that motor 40 can normally start；Afterwards, feedback comparison circuit 70 one is produced the most electric
Flow control signals (Voc), and it is input to logic control circuit 20, in order to control three-phase direct-current brushless horse
Reach the speed of 40.Then, three-phase direct-current brushless motor 40 i.e. can become according to the electric current on motor coil
Change, produce counter electromotive force and be input to counter electromotive force circuit for detecting 50, and counter electromotive force circuit for detecting
50 i.e. detect counter electromotive force according to three-phase coil (U, V, W) and three-phase motor central point (Com) becomes
Change, finally the variable quantity of the reaction gesture detected is exported logic control circuit 20, in order to control
Motor 40 exports the conversion of phase place.
Then, refer to Fig. 2, be the direct current brushless motor without Hall element drive system for the present invention
Rotor circuit for detecting Organization Chart.As in figure 2 it is shown, rotor circuit for detecting 10 comprises: a voltage turns
Change current circuit 102, its input and sensing voltage (Vsense) connect, wherein, sense voltage (Vsense)
Be by with the three-phase output drive signal (M being connected logic control circuit 20u、Mv、Mw) drive through load
Output electric current (the I that circuit 30 is exportedsense) flow through sensing resistance (Rsense) produced by 301；And
The outfan of voltage switching current circuit 102 and a sample resistance (Rsample) 104 connections, and produce one
Sampling voltage (Vsample)；One concussion frequency generating circuit 116, it is according to adjusting electric capacity (Cadj)101
Produce a clock signal to logic control circuit 20；One first controls switch S1, according to logic control circuit
20 output clock signals turn on, its one end is connected with sampling voltage 104, and its other end and
One first electric capacity C1Connect；One second controls switch S2, according to the sequential of logic control circuit 20 output
Signal turns on, and its one end is connected with sampling voltage 104, and its other end and one second electric capacity C2
Connect；One comparator 114, it passes through the first electric capacity C1With the second electric capacity C2Make comparisons, produce one defeated
Go out comparison signal to logic control circuit 20, and according to exported by logic control circuit 20 time
Sequential signal starts the first control switch S1Switch S is controlled with second2。
Further describe, rotor circuit for detecting 10 according to logic control circuit 20 give six kinds defeated
Go out phase place to load driving circuits 30, and produce maximum phase output electric current (Isense) to sensing resistance
(Rsense), to produce a sensing voltage (Vsense), then produce defeated by voltage switching current circuit 102
Go out electric current to sample resistance (Rsample) 104, to produce sampling voltage (Vsample).Afterwards, via patrolling
Collect the control of control circuit 20, first the sampling voltage of the first two phase place is stored in individually the first electric capacity C1
With the second electric capacity C2, re-use comparator 114 afterwards and carry out the comparison of voltage, produce an output and compare
Signal also exports to logic control circuit 20；Now, concussion frequency generating circuit
(Crystal Oscillator, OSC) 116 also can provide a clock signal to logic control circuit 20,
Logic control circuit 20 then can give to turn according to the clock signal of concussion frequency generating circuit 116
First control switch S of sub-circuit for detecting 101Switch S is controlled with second2The time of required conducting；With
Time, logic control circuit 20 can be little by sampling voltage according to the output comparison signal of comparator 114
Switch open to sample the voltage of next phase place, export phase places through six phase differences in this way
After, to find out the phase place producing maximum current, and compare previous phase place and a rear phase again according to this phase place
The size of position and then determine that suitable output starts phase place.It addition, in concussion frequency generating circuit 116
Additional one adjusts electric capacity 101, controls the clock signal of concussion frequency generating circuit to logic control circuit
The time of 20, the time of detecting rotor-position can be increased, to improve the precision of circuit for detecting.
Followed by, refer to Fig. 3, be the rotor-position for the present invention and six phase phase current graphs of a relation.
As it is shown on figure 3, three-phase direct-current brushless motor has U phase, V phase, the three-phase coil of W phase, rotor
Circuit for detecting 10 gives six kinds of output phase places according to rotor different angles；Such as, with 60 degree for one
During anglec of rotation switching benchmark, then can measure and flow through W phase (path 1) from U phase, flow through from U phase
V phase (path 2), flow through from W phase V phase (path 3), flow through from W phase U phase (path 4),
Flow through U phase (path 5) from V phase, flow through the electric current in six paths such as W phase (path 6) from V phase,
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 low
Current potential, Z represent phase of impedance, have six kinds of output phase places, are to be flow to low electricity by high potential according to electric current
Position characteristic determines the suitable phase place of output, such as: rotor phase 1 represents electric current and flows through W from U phase
Phase (such as path 1 in Fig. 3), rotor phase 2 represent electric current and flow through V phase (such as path Fig. 3 from U phase
2), rotor phase 3 represents electric current and flows through V phase (such as path 3 Fig. 3), rotor phase 4 from W phase
Represent that electric current flows through U phase (such as path 4 Fig. 3) from W phase, rotor phase 5 represents electric current from V phase
Flow through U phase (such as path 5 in Fig. 3), rotor phase 6 represents electric current and flows through W phase (such as Fig. 3 from V phase
Middle path 6), by the current relationship of above six kinds of output phase places, in that case it can be decided that the position of rotor.Connect
, find out maximum current value phase place, before now logic control circuit 20 can compare according to this phase place again
One phase place and the size of a rear phase place, and then determine that suitable output starts phase place, actual rotor is detected
Action relationships is as shown in table 2:
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 | Previous phase | Maximum | A rear phase | Next phase rear |
Detecting action relationships table according to this rotor, wherein H represents high potential, L represents electronegative potential, Z
Represent phase of impedance.First, rotor circuit for detecting 10 understands six given according to logic control circuit 20
Plant output phase place, compare and find out central maximum current value phase place, and it is previous to compare it again according to this phase place
Phase place and the size of a rear phase place, find out second largest current value phase place, then according to maximum current value phase place
With second largest current value phase place and then determine that suitable output starts phase place.It judges that manner of comparison is as follows
Described: after known maximum current value phase place, compare the size of its previous phase place and a rear phase place and find out the
Two big current value phase places, if previous phase place is more than a rear phase place, then starts phase place and are maximum current
Next phase place of value phase place；But, if previous phase place is less than a rear phase place, then starts phase place and be
Next phase place after maximum current value phase place.For example: when state A, it is assumed that maximum current value
Phase place is rotor phase 2, and the size comparing its previous phase place and a rear phase place finds out second largest current value
Phase place, finds that its previous phase place is more than a rear phase place, and the most second largest current value phase place is positioned at rotor phase
Position 1, according to the judgement of maximum current value phase place with second largest current value phase place, determines that starting phase place is
Next phase place of rotor phase 2 i.e. rotor phase 3；Contrary, compare its previous phase place and a rear phase
The size of position finds out second largest current value phase place, if its previous phase place is less than a rear phase place, and now second
Big current value phase place is positioned at rotor phase 3, according to maximum current value phase place and second largest current value phase place
Judgement, determine that starting phase place is next phase place i.e. rotor phase 4 after rotor phase 2.
Please continue to refer to Fig. 4, it it is the direct current brushless motor without Hall element drive system for the present invention
Speed parameter generative circuit Organization Chart.As shown in Figure 4, speed parameter generative circuit comprises: one starts
Current control circuit 602, its one end and adjustment resistance (Radj) 601 connections；One first activate switch A,
One end receives the activate switch signal (V of logic control circuit 20ss), and its other end and startup electricity
Flow control circuit 602 connects, and exports a starting current (Ist) it flow to a speed controlling resistance
(Rsc) 604, to produce a speed control voltage (Vsc) export to feedback comparison circuit 70；One voltage turns
Changing current circuit 606, it is according to input signal (VInput) and reference voltage (VRef) produce a speed controlling
Electric current (Isc)；One second activate switch B, one end receives Speed control currents (Isc), and according to institute
Output speed controls electric current (Isc) it flow to speed controlling resistance (Rsc) 604, to produce speed control voltage
(Vsc) and export to feedback comparison circuit 70.
When rotor circuit for detecting determines output phase place, from the activate switch of logic control circuit 20
Signal (Vss) A point can be switched to so that starting current control circuit 602 exports starting current (Ist)
To speed controlling resistance (Rsc) 604 generation one speed control voltage (Vsc) export to feedback comparison circuit
70, then, by its speed control voltage (Vsc) and sensing voltage (Vsense) compare decision first step startup
Size of current is to guarantee that motor can normally start；After motor starting is stable, logic control circuit 20
Activate switch signal can switch to B point, now according to input signal (VInput) and reference voltage (VRef)
Relatively produce a Speed control currents (Isc), control the rotating speed of motor.It addition, in starting current control
Circuit 602 additional one adjusts resistance (Radj) 601 can adjust suitable size of current and guarantee that circuit is normal
Start.
Then, refer to Fig. 5, be the direct current brushless motor without Hall element driving method for the present invention
Flow chart.As it is shown in figure 5, direct current brushless motor without Hall element driving method, it is to comprise following step
Rapid:
Step 1000: a three-phase direct-current brushless motor is provided；
Step 1001: utilize a rotor circuit for detecting, detects the rotor-position of three-phase direct-current brushless motor,
And give the three-phase output drive signal (M that a logic control circuit is correspondingu、Mv、Mw)；Its rotor
Circuit for detecting one end is connected with logic control circuit, and by the output signal exported and corresponding
Three-phase output drive signal (Mu、Mv、Mw) reach logic control circuit, subsequently enter step 1002.
Step 1002: input three-phase output drive signal (Mu、Mv、Mw) to a load driving circuits,
Produce three-phase output voltage (Vu、Vv、Vw) export electric current (I with oneL) to drive three-phase direct-current brushless motor；
Its one end is connected with load driving circuits, and by its three-phase output drive signal (Mu、Mv、Mw) reach
Load driving circuits, produces three-phase output voltage (Vu、Vv、Vw) export electric current (I with oneL) to drive three
Phase DC Brushless Motor, subsequently enters step 1003.
Step 1003: utilize the sensing resistance (R being connected to load driving circuits one endsense) produced
A raw sensing voltage (Vsense) so that rotor circuit for detecting is logical before three-phase direct-current brushless motor starting
Cross adjustment electric capacity (Cadj) increase the time detecting rotor-position；It senses voltage (Vsense) correspondence is defeated
Enter to turn round sub-circuit for detecting detecting rotor-position, and in order to reach to detect the degree of accuracy of rotor-position, in
Rotor circuit for detecting additional one adjusts electric capacity (Cadj) adjust the detecting time, subsequently enter step 1004.
Step 1004: optionally utilize a feedback comparison circuit, will sensing voltage (Vsense) with one
Speed control voltage (the V that speed parameter generative circuit is exportedsc) make comparisons, produce an overcurrent control
Signal (V processedoc), it is input to logic control circuit and then controls the speed of three-phase direct-current brushless motor, and
Resistance (R is adjusted by oneadj) adjust start after first step size of current to guarantee that motor normally starts；
When, after three-phase direct-current brushless motor starting, feedback comparison circuit can be according to sensing voltage (Vsense) and speed
Output voltage (the V of parameter generative circuitsc) make comparisons, and adjust in speed parameter generative circuit additional
Resistance (Radj) guarantee that motor normally starts with first step size of current after adjusting startup, produce one afterwards
Excess current control signal (Voc) be input to logic control circuit and then control three-phase direct-current brushless motor
Speed, finally enters step 1005.
Step 1005: utilize a counter electromotive force circuit for detecting, according to the three-phase of three-phase direct-current brushless motor
A counter electromotive force change is detected in coil (U, V, W) and three-phase central point (Com) feedback, produces output knot
Fruit is to logic control circuit and then the phse conversion of control three-phase direct-current brushless motor；Its three-phase dc without
Brush motor i.e. can produce counter electromotive force according to the curent change on motor coil and be input to counter electromotive force
Circuit for detecting, counter electromotive force circuit for detecting is according to three-phase coil (U, V, W) and three-phase motor center
Point (Com) detecting counter electromotive force change, finally exports the variable quantity of the reaction gesture detected and patrols
Collect control circuit, in order to control the conversion of motor output phase place.
Additionally, it is emphasized that its rotor circuit for detecting and speed parameter generative circuit structure composed with
And correlation function is identical with Fig. 4 with earlier figures 2, do not repeat them here.
Although the present invention is disclosed above with aforesaid preferred embodiment, so it is not limited to this
Bright, any it is familiar with alike operator, without departing from the spirit and scope of the present invention, a little when making
Change and retouching, therefore the scope of patent protection of the present invention must regard right defined as
Accurate.
Claims (8)
1. a direct current brushless motor without Hall element drive system, including:
One rotor circuit for detecting, its one end adjusts electric capacity with one and is connected, and exports according to this adjustment electric capacity
One clock signal；
One logic control circuit, its one end is connected with this rotor circuit for detecting, and detects according to this rotor
One output signal of circuit produces a corresponding three-phase output drive signal, and by this adjustment electric capacity
Control this clock signal output time to this logic control circuit of this rotor circuit for detecting；
One load driving circuits, its one end connects with this three-phase output drive signal of this logic control circuit
Connect, and produce a three-phase output voltage and an output electric current, in order to drive a three-phase direct-current brushless motor
Rotate, and the other end of this load driving circuits connects a sensing resistance, in order to produce a sensing voltage,
And this sensing voltage is inputted to this rotor circuit for detecting；
One counter electromotive force circuit for detecting, its one end respectively with the three-phase in this three-phase direct-current brushless motor
Coil and three-phase direct-current brushless motor center's point feedback connect, and its other end and this logic control
One end of circuit connects；
One speed parameter generative circuit, one end receives an activate switch letter of this logic control circuit
Number, and according to an input signal and the difference of a reference voltage, produce a speed control voltage,
And its other end connects an adjustment resistance；And
One feedback comparison circuit, its two input connects with this sensing voltage and this speed control voltage respectively
Connect, make comparisons with this speed control voltage according to this sensing voltage, produce an excess current control signal defeated
Enter to this logic control circuit；
Wherein, this rotor circuit for detecting comprises:
One voltage switching current circuit, its input is connected with this sensing voltage, wherein, this sensing electricity
Pressure is by defeated through this load driving circuits with this three-phase output drive signal being connected this logic control circuit
This output electric current gone out flows through produced by this sensing resistance, and its outfan and a sample resistance are even
Connect, and produce a sampling voltage；
One concussion frequency generating circuit, its one end connects this adjustment electric capacity and produces this clock signal to being somebody's turn to do
Logic control circuit；
One first controls switch, and this clock signal exported according to this logic control circuit turns on, its
One end is connected with this sampling voltage, and its other end and one first electric capacity connect；
One second controls switch, and this clock signal exported according to this logic control circuit turns on, its
One end is connected with this sampling voltage, and its other end and one second electric capacity connect；And
One comparator, it is made comparisons with this second electric capacity by this first electric capacity, produces an output and compares
Signal is to this logic control circuit, and according to this clock signal exported by this logic control circuit
Start this first control switch and this second control switch.
Direct current brushless motor without Hall element drive system the most according to claim 1, wherein should
Speed parameter generative circuit comprises:
One starting current control circuit, its one end is connected with this adjustment resistance；
One first activate switch, one end receives this activate 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 exports to this feedback comparison circuit to produce a speed control voltage；
One voltage switching current circuit, it produces a speed control according to this input signal and this reference voltage
Electric current processed；And
One second activate switch, one end receives this Speed control currents, and according to being exported this speed
Control electric current and flow to this speed controlling resistance to produce this speed control voltage and to export to this feedback ratio
Relatively circuit.
Direct current brushless motor without Hall element drive system the most according to claim 1 and 2, its
In this rotor circuit for detecting by this adjustment electric capacity change detecting rotor-position time.
Direct current brushless motor without Hall element drive system the most according to claim 1, wherein should
Speed parameter generative circuit changes during this three-phase direct-current brushless motor starting by this adjustment resistance
One step electric current.
5. a direct current brushless motor without Hall element driving method, this is without Hall element brush DC horse
Reach and include a rotor circuit for detecting, a load driving circuits, a counter electromotive force circuit for detecting, a speed
Parameter generative circuit and a feedback comparison circuit, one end of this rotor circuit for detecting and a logic control
Circuit connects, and one end of this load driving circuits drives letter with a three-phase output of this logic control circuit
Number connect, one end of this counter electromotive force circuit for detecting respectively with or three in a three-phase direct-current brushless motor
Phase coil and three-phase direct-current brushless motor center's point feedback connect, and its other end and this logic control
One end of circuit processed connects, and one end of this speed parameter generative circuit is connected to this feedback comparison circuit,
The input of this feedback comparison circuit is connected with this load driving circuits, it is characterised in that: this rotor is detectd
Slowdown monitoring circuit comprise a voltage switching current circuit, one concussion frequency generating circuit, one first control switch,
One second controls switch and a comparator, the input of this voltage switching current circuit and a sensing voltage
Connecting, and its outfan and a sample resistance connect, and produce a sampling voltage, this concussion frequency is produced
One end of raw circuit connects an adjustment electric capacity and produces a clock signal to this logic control circuit, and this is the years old
One controls switch turns on according to this clock signal of this logic control circuit output, and its one end takes with this
Sample voltage connects, and its other end and one first electric capacity connect, and this second control switch is according to this logic control
This clock signal of circuit processed output turns on, and its one end is connected with this sampling voltage, and its another
End is connected with one second electric capacity, and this comparator is made comparisons with this second electric capacity by this first electric capacity, produces
A raw output comparison signal is to this logic control circuit, and is exported according to by this logic control circuit
This clock signal start this first control switch with this second control switch；And this is without Hall element
DC Brushless Motor driving method includes:
Detect a rotor-position of this three-phase direct-current brushless motor, utilize this rotor circuit for detecting to detect
This rotor-position of this three-phase direct-current brushless motor, and according to this rotor circuit for detecting exported one defeated
Go out signal and give this three-phase output drive signal that this logic control circuit is corresponding；
Drive this three-phase direct-current brushless motor, the input of this three-phase output drive signal is driven to this load
Circuit, produces a three-phase output voltage and an output electric current to drive this three-phase direct-current brushless motor；
Adjust the detecting time, utilize the sensing resistance being connected to this load driving circuits one end to be produced
This sensing voltage, and compare this sensing voltage and this speed parameter by this feedback comparison circuit and generate
The speed control voltage that circuit is exported, produces an excess current control signal and inputs to this logic control
Circuit, one end of this rotor circuit for detecting is connected to this adjustment electric capacity, this rotor circuit for detecting in this three
Phase DC Brushless Motor exports this sequential by this rotor circuit for detecting of this adjustment Capacity control before starting
Signal is to time of this logic control circuit；And
Detecting counter electromotive force change, utilize this counter electromotive force circuit for detecting, according to this three-phase dc without
A counter electromotive force is detected in this three-phase coil of brush motor and this three-phase direct-current brushless motor center's point feedback
Change, produce output result to this logic control circuit and then the phase controlling this three-phase direct-current brushless motor
Bit map.
Direct current brushless motor without Hall element driving method the most according to claim 5, wherein,
After completing to adjust the detecting time, adjust resistance further, to adjust this three-phase direct-current brushless
First step size of current after motor starting.
Direct current brushless motor without Hall element driving method the most according to claim 6, wherein should
Speed parameter generative circuit comprises:
One starting current control circuit, its one end is connected with this adjustment resistance；
One first activate switch, one end receives an activate 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 output to a feedback comparison circuit；
One voltage switching current circuit, it produces a speed control according to an input signal and a reference voltage
Electric current processed；And
One second activate switch, one end receives this Speed control currents, and according to being exported this speed
Control electric current and flow to this speed controlling resistance, to produce this speed control voltage and to export to this feedback ratio
Relatively circuit.
8. a direct current brushless motor without Hall element drive system, including: a rotor circuit for detecting,
Its one end is connected with a logic control circuit, and this logic control circuit is according to this rotor circuit for detecting
One output signal produces a corresponding three-phase output drive signal, a load driving circuits, its one end
Be connected with this three-phase output drive signal of this logic control circuit, and produce a three-phase output voltage with
One output electric current, in order to drive a three-phase direct-current brushless revolution, a counter electromotive force circuit for detecting,
Its one end respectively with the three-phase coil in this three-phase direct-current brushless motor and a three-phase direct-current brushless
The feedback of motor center's point connects, and its other end is connected with one end of this logic control circuit, a speed
Parameter generative circuit, one end receives an activate switch signal of this logic control circuit, and according to one
Input signal and the difference of a reference potential signal, produce a speed control voltage, and one time
Feedback comparison circuit, its two input is connected with this load driving circuits and this speed control voltage respectively,
Produce an excess current control signal and be input to this logic control circuit, wherein this without Hall element direct current without
Brush motor-driven system is characterised by:
This rotor circuit for detecting comprises:
One voltage switching current circuit, its input and a sensing voltage connect, wherein, and this sensing electricity
Pressure is by defeated through this load driving circuits with this three-phase output drive signal being connected this logic control circuit
This output electric current gone out flows through produced by a sensing resistance, and its outfan and a sample resistance are even
Connect, and produce a sampling voltage；
One concussion frequency generating circuit, its one end connects an adjustment electric capacity and produces a clock signal to being somebody's turn to do
Logic control circuit, is exported extremely by this clock signal of this this rotor circuit for detecting of adjustment Capacity control
The time of this logic control circuit；
One first controls switch, and this clock signal exported according to this logic control circuit turns on, its
One end is connected with this sampling voltage, and its other end and one first electric capacity connect；
One second controls switch, and this clock signal exported according to this logic control circuit turns on, its
One end is connected with this sampling voltage, and its other end and one second electric capacity connect；And
One comparator, it is made comparisons with this second electric capacity by this first electric capacity, produces an output and compares
Signal is to this logic control circuit, and according to this clock signal exported by this logic control circuit
Start this first control switch and this second control switch.
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| Application Number | Priority Date | Filing Date | Title |
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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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| Application Number | Priority Date | Filing Date | Title |
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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 true CN103490680B (en) | 2016-08-24 |
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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 |
| TWI766351B (en) * | 2020-08-27 | 2022-06-01 | 茂達電子股份有限公司 | Motor driving circuit and method thereof |
| CN113054876A (en) * | 2021-03-17 | 2021-06-29 | 林国尊 | Sensorless brushless DC motor control device and method for ceiling fan |
| CN114142767B (en) * | 2021-12-23 | 2024-08-13 | 东莞市点精科技有限公司 | Brushless motor control circuit and controller |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1148911A (en) * | 1994-05-20 | 1997-04-30 | Sl蒙特维迪奥技术有限公司 | Virtual hall-effect signal generating for a brushless sensorless electrical rotary machine |
| TW200843321A (en) * | 2007-03-26 | 2008-11-01 | Sanyo Electric Co | Motor restriction detecting circuit |
| TW201125277A (en) * | 2010-01-07 | 2011-07-16 | Univ Nat Sun Yat Sen | Speed control method of sensorless brushless DC motor using current feedback |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09261993A (en) * | 1996-03-21 | 1997-10-03 | Fujitsu General Ltd | Control method of brushless motor |
| JP2009148074A (en) * | 2007-12-14 | 2009-07-02 | Renesas Technology Corp | Motor drive |
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2012
- 2012-06-12 CN CN201210192518.0A patent/CN103490680B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1148911A (en) * | 1994-05-20 | 1997-04-30 | Sl蒙特维迪奥技术有限公司 | Virtual hall-effect signal generating for a brushless sensorless electrical rotary machine |
| TW200843321A (en) * | 2007-03-26 | 2008-11-01 | Sanyo Electric Co | Motor restriction detecting circuit |
| TW201125277A (en) * | 2010-01-07 | 2011-07-16 | Univ Nat Sun Yat Sen | Speed control method of sensorless brushless DC motor using current feedback |
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