CN103346714A - No-position detection circuit and implementation method thereof - Google Patents
No-position detection circuit and implementation method thereof Download PDFInfo
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- CN103346714A CN103346714A CN2013103210755A CN201310321075A CN103346714A CN 103346714 A CN103346714 A CN 103346714A CN 2013103210755 A CN2013103210755 A CN 2013103210755A CN 201310321075 A CN201310321075 A CN 201310321075A CN 103346714 A CN103346714 A CN 103346714A
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Abstract
The invention relates to a no-position detection circuit and an implementation method of the no-position detection circuit. The no-position detection circuit comprises a first bleeder circuit and a second bleeder circuit, wherein the first bleeder circuit is formed by resistors R1, R2, R3 and R5; the second bleeder circuit is formed by resistors R4 and R6 for achieving voltage division of busbar voltage Vbus; the resistors R1, R2 and R3 are respectively connected with one phase of a three-phase winding of a motor; one end of the resistor R5 is connected with the resistors R1, R2 and R3; the other end of the resistor R5 is grounded; one end of the resistor R4 is connected with the busbar voltage Vbus; the other end of the resistor R4 is connected with the resistor R6; the resistor R6 is grounded. A counter electric potential zero-crossing point is obtained by comparing a point n between the resistors R1, R2 and R3 and the resistor R5 with a point b between the resistor R4 and the resistor R6. By adopting the no-position detection circuit and the implementation method of the no-position detection circuit, compared with the traditional detection circuit and the method thereof, an implementation circuit is greatly simplified; the cost of the no-position detection part is reduced; and program is easily implemented.
Description
Technical field
The present invention relates to does not a kind ofly have method for detecting position it is applicable to the non-brush permanent-magnet DC motor of square wave back-emf and sinusoidal wave back-emf, is specifically related to a kind of new testing circuit and cooperates the detection method of this testing circuit.
Background technology
No location detecting technology makes non-brush permanent-magnet DC motor be difficult for the installation site transducer and relatively responsive and to the occasion of some not high occasions of service requirement to cost, as fields such as blower fan pump quasi-controller and aircraft, automobile-used model plane controllers, obtained using comparatively widely.Present most of non-brush permanent-magnet DC motor all adopts the method control of two-phase energising, under this control mode, can realize not having position probing by detecting the back-emf zero crossing, namely detect virtual central point and the no power opposite potential obtains effective zero cross signal, because the time between two zero cross signals is motor operation 60 degree electrical degree time T 60, so half that detects time-delay T60 behind the zero cross signal just can obtain correct commutating period.Fig. 1 realizes circuit for it, and resistance R 1, R2, R3 and R7 dividing potential drop realize the phantom center point among the figure, and resistance R 4/R10, R5/R9, R6/R8 are motor UVW three-phase divider resistance, need guarantee that wherein R1-R6 equates, R8-R10 equates, and R8=3R7, and the value of concrete resistance is relevant with busbar voltage.In program when operation, come dividing potential drop u(v or the w of comparison no power opposite potential by comparator or AD sampling) obtain zero cross signal time-delay control motor commutation with the size of virtual mid point n.
Sometime, any one all might be the no power phase mutually, so needing to detect this 3 phase phase voltage signal of UVW at circuit, this zero passage detection method gets wherein that no power uses mutually, so just cause and all to carry out dividing potential drop to this 3 phase phase voltage of UVW, and use the size that 3 road comparators or AD resource are come comparison phase voltage and virtual center point, and in fact arbitrary moment wherein has only one road circuit (comprising bleeder circuit and comparator or AD) in action, the waste that this has just caused circuit resource has improved the cost of realizing no position probing.
Summary of the invention
At the deficiency that exists on the prior art, the invention provides a kind of no position detecting circuit and its implementation that has reduced no position probing cost.
To achieve these goals, the present invention realizes by the following technical solutions:
A kind of no position detecting circuit is characterized in that, comprises first bleeder circuit that resistance R 1, R2, R3, R5 constitute, and second bleeder circuit of dividing potential drop is carried out in the realization that constitutes of resistance R 4, R6 to bus;
Described resistance R 1, R2, R3 respectively with motor three phase windings in one be connected, described resistance R 5 one ends are connected with described resistance R 1, R2, R3, described resistance R 5 other end ground connection;
Described resistance R 4 one ends are connected with bus, and described resistance R 4 other ends are connected with resistance R 6, described resistance R 6 ground connection;
Compare by some n between described resistance R 1, R2, R3 and the resistance R 5 and a some b between described resistance R 4 and the resistance R 6, to obtain the back-emf zero crossing.
In order better to realize above-mentioned summary of the invention, the present invention also can make following further improvement:
According to one embodiment of present invention, the resistance of described resistance R 1, R2, R3 equates.
According to one embodiment of present invention, described resistance R 4 equates with the resistance of resistance R 1.
According to one embodiment of present invention, described resistance R 6 is closed with the resistance of resistance R 5 and is: 3R6=2R5.
According to one embodiment of present invention, the voltage between described n point and the b point detects by comparator or AD.
The present invention can also be:
Design first bleeder circuit that comprises that resistance R 1, R2, R3, R5 constitute, and second bleeder circuit of dividing potential drop is carried out in the realization that constitutes of resistance R 4, R6 to bus;
Make described resistance R 1, R2, R3 respectively with motor three phase windings in one be connected, described resistance R 5 one ends are connected with described resistance R 1, R2, R3, described resistance R 5 other end ground connection; And described resistance R 4 one ends are connected with bus, and described resistance R 4 other ends are connected with resistance R 6, described resistance R 6 ground connection;
Compare by some n between described resistance R 1, R2, R3 and the resistance R 5 and a some b between described resistance R 4 and the resistance R 6, to obtain the back-emf zero crossing.
According to one embodiment of present invention, the resistance of described resistance R 1, R2, R3 equates.
According to one embodiment of present invention, described resistance R 4 equates with the resistance of resistance R 1.
According to one embodiment of present invention, described resistance R 6 is closed with the resistance of resistance R 5 and is: 3R6=2R5; The n point voltage is
The b point voltage is
Interim, Uu, Uv, Uw are motor three-phase winding terminal voltage,
When R5＜＜approximate having during R1
According to one embodiment of present invention, the voltage between described n point and the b point detects by comparator or AD; Open the interval at PWM, relatively n point voltage and b point voltage can obtain the back-emf zero crossing, time-delay control motor commutation; Turn-off the interval at PWM, relatively the size of n point voltage and " 0 " current potential can obtain the zero crossing time-delay control motor commutation of back-emf.
Compared with prior art, the invention has the beneficial effects as follows:
No position detecting circuit of the present invention and its implementation are compared with traditional testing circuit and method thereof and to have been simplified the realization circuit greatly, reduced the cost of no position detection part, and the program that is easy to more realize.
Description of drawings
Describe the present invention in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is that the back-emf zero passage detection of prior art realizes circuit.
Fig. 2 a is a bleeder circuit of no position detecting circuit.
Fig. 2 b is another bleeder circuit of no position detecting circuit.
Fig. 3 is PWM configuration mode schematic diagram.
Fig. 4 is the realization flow figure of no method for detecting position.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with embodiment, further set forth the present invention.
One embodiment of the present of invention relate to a kind ofly not to be had method for detecting position it is applicable to the non-brush permanent-magnet DC motor of square wave back-emf and sinusoidal wave back-emf, it comprises a kind of new testing circuit and cooperates the detection method of this testing circuit to open detection at PWM and can detect when PWM turn-offs again, compare this detection method with traditional detection method and simplified the realization circuit greatly, reduced the cost of no position detection part, and the program that is easy to more realizes.
The voltage equation of non-brush permanent-magnet DC motor is:
Because i
u+ i
v+ i
w=0 has: u
u+ u
v+ u
w=e
u+ e
v+ e
w+ 3u
n2 formulas
Suppose that U phase no power is then at this moment:
u
u=e
u+ u
n3 formulas
1, be that the non-brush permanent-magnet DC motor of square wave has for back-emf:
e
v+ e
w=04 formula
Get in conjunction with 2,3,4 formulas:
5 formulas
2, have for the sine wave permanent magnet dc brushless motor for back-emf:
e
u+ e
v+ e
w=06 formula
Get in conjunction with 2,3,6 formulas:
When PWM turn-offs
And when PWM opens
By 5 formulas and 7 formulas as can be seen, when PWM turn-offs relatively
Size with 0 compares when PWM opens
With
Size just can obtain no power phase U opposite potential e
uZero crossing, thus commutation information obtained, and this detection method is all set up for the non-brush permanent-magnet DC motor of square wave back-emf and sinusoidal wave back-emf, just back-emf e
uAmplitude can be not different when zero crossing.In like manner this method is set up during no power mutually equally for V and W.
Fig. 2 a is a bleeder circuit of no position detecting circuit; Fig. 2 b is another bleeder circuit of no position detecting circuit.It realizes circuit as shown in Fig. 2 a, Fig. 2 b, and a kind of no position detecting circuit comprises first bleeder circuit that resistance R 1, R2, R3, R5 constitute, and second bleeder circuit of dividing potential drop is carried out in the realization that constitutes of resistance R 4, R6 to busbar voltage Vbus;
Described resistance R 1, R2, R3 respectively with motor three phase windings in one be connected, described resistance R 5 one ends are connected with described resistance R 1, R2, R3, described resistance R 5 other end ground connection;
Described resistance R 4 one ends are connected with busbar voltage Vbus, and described resistance R 4 other ends are connected with resistance R 6, described resistance R 6 ground connection;
Compare by some n between described resistance R 1, R2, R3 and the resistance R 5 and a some b between described resistance R 4 and the resistance R 6, to obtain the back-emf zero crossing.
The resistance of described resistance R 1, R2, R3 equates.
Described resistance R 4 equates with the resistance of resistance R 1.
Described resistance R 6 is closed with the resistance of resistance R 5: 3R6=2R5.
Voltage between described n point and the b point detects by comparator or AD.
Continuation is referring to Fig. 2 a, Fig. 2 b, and a kind of implementation method of not having position detecting circuit designs first bleeder circuit that comprises that resistance R 1, R2, R3, R5 constitute, and second bleeder circuit of dividing potential drop is carried out in the realization that constitutes of resistance R 4, R6 to busbar voltage Vbus;
Make described resistance R 1, R2, R3 respectively with motor three phase windings in one be connected, described resistance R 5 one ends are connected with described resistance R 1, R2, R3, described resistance R 5 other end ground connection; And described resistance R 4 one ends are connected with busbar voltage Vbus, and described resistance R 4 other ends are connected with resistance R 6, described resistance R 6 ground connection;
Compare by some n between described resistance R 1, R2, R3 and the resistance R 5 and a some b between described resistance R 4 and the resistance R 6, to obtain the back-emf zero crossing.
The formation potential-divider network of resistance R 1, R2, R3 and R5 is R1=R2=R3 wherein, and the potential-divider network of R4 and R6 is realized the dividing potential drop to busbar voltage Vbus.When satisfying R4=R1 and 3R6=2R5, the n point voltage is
The b point voltage is
Open the interval at PWM, relatively n point voltage and b point voltage can obtain the back-emf zero crossing, time-delay control motor commutation; Turn-off the interval at PWM, relatively the size of n point voltage and " 0 " current potential can obtain the zero crossing time-delay control motor commutation of back-emf.This no method for detecting position is compared in former method and has been reduced by 4 detection resistance, and only need 1 road comparator or 2 road AD resources, and detect also and can only need 1 road AD can realize zero passage detection if only do the PWM shutoff, simplified circuit greatly, reduced the realization cost, and be easy to realize.
The realization of no position detecting circuit:
Turn-off detection for PWM, can realize not having position probing referring to R1, R2, R3 and the R5 formation bleeder circuit of testing circuit among Fig. 2 a, Fig. 2 b.R1=R2=R3 in the circuit, the n point voltage is
Wherein
When R5＜＜approximate having during R1
Uu, Uv, Uw are motor three-phase winding terminal voltage.Non-brush permanent-magnet DC motor for square wave back-emf and sinusoidal wave back-emf, the size that is compared n point voltage and " 0 " voltage by 5 formulas and 7 formulas (among the embodiment 1) as can be known can obtain the back-emf zero crossing, and the comparison of this two point voltage can realize by comparator or AD sampling.Although negative voltage may appear in the n point here, entire circuit does not have negative supply, and this negative voltage by dividing potential drop a lot of doubly, so can think that the n point voltage occurs from just to zero or be the back-emf zero crossing from zero to timing.
Open detection for PWM, R1, the R2 of testing circuit, R3 and R5 constitute wherein R1=R2=R3 of bleeder circuit among Fig. 2 a, Fig. 2 b, and then the n point voltage is
Wherein
When R5＜＜approximate having during R1
R4 and R6 constitute bleeder circuit wherein R4=R1 and 3R6=2R5, and then the b point voltage is approximately
Non-brush permanent-magnet DC motor for square wave back-emf and sinusoidal wave back-emf, the size that is compared n point voltage and b voltage by 5 formulas and 7 formulas (among the embodiment 1) as can be known can obtain the back-emf zero crossing, the comparison of this two point voltage can be by comparator or AD sampling realization, as shown in Figure 3.
In sum, if this detection method all detects then needs resistance R 1, R2, R3, R4, R5 and R6 and two-way comparator or two-way AD to realize no position probing for opening shutoff; So only need resistance R 1, R2, R3 and R5 and one road comparator or AD can realize not having position probing for just turn-offing to detect based on PWM; So then need resistance R 1, R2, R3, R4, R5 and R6 and one road comparator or AD can realize not having position probing for just opening detection based on PWM.Adopt above-mentioned this detection method of any detection mode all will save circuit devcie more than traditional method, implement also simpler.
The realization of no detection algorithm
Because back-emf signal is strong inadequately when low speed, is not enough to do input, motor operated in carry out back-emf under certain speed conditions again and detect so beginning needs the location to drag earlier.At first fixing two-phase energising lock out motor rotor to definite position, again by certain phase sequence and accelerating time, switching tube is turned on and off in turn realizes that rotor constantly accelerates, till only reaching predetermined speed or detect effective zero crossing of some to rotor speed.
The PWM counter is set is round count mode, PWM output switching activity when count value equals the value of setting, as shown in Figure 3.Here disposing PWM is that the corresponding detection mode of turn-offing is interrupted in generation in 0 o'clock at counter; Produce the interruption correspondence during for maximum count value and open detection mode; Be 0 and maximum all produce and interrupt corresponding the shutoff and open detection mode.
When producing the PWM interruption, reading in copped wave phase IO mouth state namely is that PWM turn-offs the interval or opens the interval interruption that produces as can be known.When turn-offing interval the interruption, by comparator or AD relatively n point voltage and " 0 " voltage size and record current preservation size state Flag.When occur previous moment for " greatly " (PreFlag=1) current time for " little " (Flag=0) or previous moment be " little " (PreFlag=0) when current time is that " greatly " (Flag=1), illustrate that back-emf has taken place crosses null event.By recording the time T 60 that two time intervals that cross null events obtain moving 60 degree electrical degrees, the time-delay T60/2 time commutate to move and got final product after producing null event; When opening interval the interruption, by comparator or AD relatively size and the current size state Flag of record preservation of n point voltage and b voltage.When occur previous moment for " greatly " (PreFlag=1) current time for " little " (Flag=0) or previous moment be " little " (PreFlag=0) when current time is that " greatly " (Flag=1), illustrate that back-emf has taken place crosses null event.By recording the time T 60 that two time intervals that cross null events obtain moving 60 degree electrical degrees, the time-delay T60/2 time commutate to move and got final product after producing null event.
Fig. 4 is the realization flow figure of no method for detecting position.
Cooperate foregoing circuit to propose a kind of detection method, this method need not known current conducting phase sequence, in PWM interrupts, determine to turn-off constantly or open constantly by reading in copped wave IO, turn-off and compare u point and " 0 " point voltage constantly, open and compare u point and b point voltage constantly, compare the different of state as current relatively state with last one, then be judged as the back-emf zero crossing.Record the zero crossing time interval twice, the operation of time-delay control motor commutation.
More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (10)
1. a no position detecting circuit is characterized in that, comprises first bleeder circuit that resistance R 1, R2, R3, R5 constitute, and second bleeder circuit of dividing potential drop is carried out in the realization that constitutes of resistance R 4, R6 to bus;
Described resistance R 1, R2, R3 respectively with motor three phase windings in one be connected, described resistance R 5 one ends are connected with described resistance R 1, R2, R3, described resistance R 5 other end ground connection;
Described resistance R 4 one ends are connected with bus, and described resistance R 4 other ends are connected with resistance R 6, described resistance R 6 ground connection;
Compare by some n between described resistance R 1, R2, R3 and the resistance R 5 and a some b between described resistance R 4 and the resistance R 6, to obtain the back-emf zero crossing.
2. no position detecting circuit according to claim 1 is characterized in that, the resistance of described resistance R 1, R2, R3 equates.
3. no position detecting circuit according to claim 2 is characterized in that, described resistance R 4 equates with the resistance of resistance R 1.
4. no position detecting circuit according to claim 3 is characterized in that, described resistance R 6 is closed with the resistance of resistance R 5 and is: 3R6=2R5.
5. according to any described no position detecting circuit of claim 1 to 4, it is characterized in that the voltage between described n point and the b point detects by comparator or AD.
6. as any described a kind of implementation method of not having position detecting circuit of claim 1 to 5, it is characterized in that, design first bleeder circuit that comprises that resistance R 1, R2, R3, R5 constitute, and second bleeder circuit of dividing potential drop is carried out in the realization that constitutes of resistance R 4, R6 to bus;
Make described resistance R 1, R2, R3 respectively with motor three phase windings in one be connected, described resistance R 5 one ends are connected with described resistance R 1, R2, R3, described resistance R 5 other end ground connection; And described resistance R 4 one ends are connected with bus, and described resistance R 4 other ends are connected with resistance R 6, described resistance R 6 ground connection;
Compare by some n between described resistance R 1, R2, R3 and the resistance R 5 and a some b between described resistance R 4 and the resistance R 6, to obtain the back-emf zero crossing.
7. the implementation method of no position detecting circuit according to claim 6 is characterized in that, the resistance of described resistance R 1, R2, R3 equates.
8. the implementation method of no position detecting circuit according to claim 7 is characterized in that, described resistance R 4 equates with the resistance of resistance R 1.
9. the implementation method of no position detecting circuit according to claim 8 is characterized in that, described resistance R 6 is closed with the resistance of resistance R 5 and is: 3R6=2R5; The n point voltage is
, the b point voltage is
Interim, Uu, Uv, Uw are motor three-phase winding terminal voltage,
When R5＜＜approximate having during R1
10. the implementation method of no position detecting circuit according to claim 9 is characterized in that, the voltage between described n point and the b point detects by comparator or AD; Open the interval at PWM, relatively n point voltage and b point voltage can obtain the back-emf zero crossing, time-delay control motor commutation; Turn-off the interval at PWM, relatively the size of n point voltage and " 0 " current potential can obtain the zero crossing time-delay control motor commutation of back-emf.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617830A (en) * | 2015-02-15 | 2015-05-13 | 矽力杰半导体技术(杭州)有限公司 | Counter electromotive force zero-cross detection method and method of brushless DC motor, and phase-changing signal output method and circuit |
| CN105305897A (en) * | 2015-11-03 | 2016-02-03 | 西北工业大学 | Back electromotive force zero-crossing detection method for brushless direct current motor in single chopper control mode |
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| CN201122923Y (en) * | 2007-11-01 | 2008-09-24 | 海尔集团公司 | Compensation circuit of DC frequency conversion compressor rotor position detecting loop |
| CN102969955A (en) * | 2011-08-29 | 2013-03-13 | 天津航天鑫茂稀土机电科技有限公司 | Non-position detection of permanent magnetic direct-current brushless double-rotor motor |
| CN203326939U (en) * | 2013-07-27 | 2013-12-04 | 湖北立锐机电有限公司 | Circuit without position detection |
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2013
- 2013-07-27 CN CN2013103210755A patent/CN103346714A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1309463A (en) * | 2000-02-14 | 2001-08-22 | 三洋电机株式会社 | Motor device |
| CN201122923Y (en) * | 2007-11-01 | 2008-09-24 | 海尔集团公司 | Compensation circuit of DC frequency conversion compressor rotor position detecting loop |
| CN102969955A (en) * | 2011-08-29 | 2013-03-13 | 天津航天鑫茂稀土机电科技有限公司 | Non-position detection of permanent magnetic direct-current brushless double-rotor motor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617830A (en) * | 2015-02-15 | 2015-05-13 | 矽力杰半导体技术(杭州)有限公司 | Counter electromotive force zero-cross detection method and method of brushless DC motor, and phase-changing signal output method and circuit |
| CN104617830B (en) * | 2015-02-15 | 2017-04-26 | 矽力杰半导体技术(杭州)有限公司 | Counter electromotive force zero-cross detection method and method of brushless DC motor, and phase-changing signal output method and circuit |
| CN105305897A (en) * | 2015-11-03 | 2016-02-03 | 西北工业大学 | Back electromotive force zero-crossing detection method for brushless direct current motor in single chopper control mode |
| CN105305897B (en) * | 2015-11-03 | 2017-11-14 | 西北工业大学 | Back-emf zero passage detection method under brshless DC motor list chopper control mode |
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Application publication date: 20131009 |