CN105429521B - The startup method for the method and motor that motor drive circuit, detection single-phase DC motor turn to - Google Patents
The startup method for the method and motor that motor drive circuit, detection single-phase DC motor turn to Download PDFInfo
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- CN105429521B CN105429521B CN201410487832.0A CN201410487832A CN105429521B CN 105429521 B CN105429521 B CN 105429521B CN 201410487832 A CN201410487832 A CN 201410487832A CN 105429521 B CN105429521 B CN 105429521B
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Abstract
The present invention discloses a kind of motor drive circuit, which includes counter electromotive force detection module and processing module.Counter electromotive force detection module is electrically connected to single-phase DC motor, to detect the counter electromotive force of the single-phase DC motor, and correspondingly output detection signal.Processing module is electrically connected to counter electromotive force detection module and single-phase DC motor, and the hall signal that processing module is exported according to the Hall element built in detection signal and single-phase DC motor judges the steering of single-phase DC motor and controls single-phase DC motor.
Description
Technical field
The present invention is about a kind of motor drive circuit, especially in regard to a kind of single-phase DC motor drive circuit.
Background technology
In general, when fan motor starts, if fan is in reversion because the return air of internal system is too strong, be easy because
Motor can not be taken back after startup just then cumlative energy cause overcurrent, burn the internal element of fan.Therefore, in fan horse
Up to start when first detect rotor whether in inverted status and correspondingly carry out control be the art important topic.
The steering of previous detection single-phase DC motor (Single Phase DC Motor), is to be set to horse by two
Hall element (Hall Element) up to rotor different angle compares two using the principle of Hall effect (Hall Effect)
Person's signal sequence difference is to judge that motor rotor turns to.The method must at least be installed on d.c. motor two Hall elements with into
The judgement that row turns to must also occupy multiple control foot positions and connect Hall elements on the control circuitry, in design it is sufficiently complex without
Just.
Invention content
The mode of the present invention is a kind of driving circuit.According to one embodiment of the invention, which includes anti-electronic
Gesture detection module and processing module.Counter electromotive force detection module is electrically connected to single-phase DC motor, to detect single-phase DC
The counter electromotive force (Back Electromotive Force) of motor, and correspondingly output detection signal.Processing module is electrically connected
It is connected to counter electromotive force detection module and single-phase DC motor, and according in detection signal, datum and single-phase DC motor
The hall signal for setting Hall element output, judges the steering of single-phase DC motor and controls single-phase DC motor.
The another way of the present invention is a kind of method that detection motor turns to, and this method comprises the steps of：It detects single-phase
The counter electromotive force of d.c. motor, and corresponding output detects signal；Receive the Hall element output built in single-phase DC motor
Hall signal；The steering of single-phase DC motor is judged according to detection signal, datum and hall signal.
The another mode of the present invention is a kind of startup method of the motor using above-mentioned steering detection, and this method includes following
Step：The hall signal of Hall element output built in single-phase DC motor judges whether single-phase DC motor is dynamic；
When single-phase DC motor is judged as static state, single-phase DC motor is directly initiated；When single-phase DC motor is dynamic, according to
Detection signal, datum and hall signal judge the steering of single-phase DC motor, wherein detection signal and single-phase DC motor
Counter electromotive force it is corresponding；According to the course changing control of the single-phase DC motor single-phase DC motor.
Description of the drawings
Fig. 1 is the driving circuit block diagram depicted in an embodiment；
Fig. 2 is the drive circuit schematic diagram depicted in an embodiment；
Fig. 3 A, 3B are the waveform of counter electromotive force and detection signal when being in different steerings according to motor depicted in an embodiment
Schematic diagram；
Fig. 4 is the drive circuit schematic diagram depicted in another embodiment；
Fig. 5 is the drive circuit schematic diagram depicted in another embodiment；
Fig. 6 is the startup method flow diagram of the motor depicted in an embodiment；
Fig. 7 is that the dynamic depicted in an embodiment reverses startup detailed flowchart.
【Symbol description】
100：Driving circuit
110：Hall element
120：Processing module
122：Control unit
124：Driving unit
130：Counter electromotive force detection module
132、132a、132b：Input terminal
134、134a、134b：Output end
136、136a、136b：Resistance unit
138、138a、138b：Resistance unit
140：Single-phase DC motor
600：Method
S610~S670：Step
S700~S780：Step
Hall_s：Hall signal
Va、Vb：Counter electromotive force
Vas、Vbs：Detect signal
CS：Control signal
S1、S2、S3、S4：Switching signal
D1、D2：Diode
Q1、Q2、Q3、Q4：Switch
R1、R2、R3、R4、R5、R6：Resistance
OP1：Comparator
VDD：Voltage source
Vref：Reference voltage
Specific implementation mode
Hereafter coordinate appended attached drawing to elaborate for embodiment, in a manner of more fully understanding the present invention, but is provided
Embodiment not to limit the range that the disclosure is covered, and the description of structure operation is non-limiting the suitable of its execution
Sequence, any structure reconfigured by element is produced to have equal and other effects device, is all the range that the disclosure is covered.
In addition, according to the standard and practice of industry, attached drawing is mapped only for the purpose of aid illustration not according to full size, practical
The size of upper various features can be increased or decreased arbitrarily in order to illustrate.Similar elements will be with identical symbol in following the description
Mark illustrates in order to understanding.
The word (terms) used in full piece specification and claim usually has in addition to having and especially indicating
Each word using in this area, in content disclosed herein with the usual meaning in special content.It is certain describing this
Disclosed word by it is lower or this specification other places discuss, to provide those skilled in the art in the description in relation to the disclosure
Upper additional guiding.
About " about " used herein, " about " or " substantially " commonly the error of exponential quantity or range in percentage
20 within, be preferably within the ten of percentage, and be more preferably then within the five of percentage.Wen Zhongruo is without specifically
It is bright, mentioned by numerical value all regard as approximation, such as can be such as the error or model represented by " about ", " about " or " substantially "
It encloses or other approximations.
In addition, word "comprising", " comprising ", " having ", " containing " etc. used in herein, are open
Term means " including but not limited to ".In addition, used herein " and/or ", including one or more in associated listed items
Any one and its all combination of a project.
In this article, it when an element is referred to as " connecting " or " coupling ", can refer to " to be electrically connected " or " electric property coupling "." even
Connect " or " coupling " also can be used to indicate two or multiple element between be collocated with each other operation or interaction.Although in addition, used herein "
The first ", " second " ... wait terms to describe different elements, which is only to distinguish the element described with same technique term
Or operation.It is indicated unless context understands, otherwise the term not especially censures or implies order or cis-position, also non-limiting
The present invention.
The mode of the present invention is a kind of driving circuit.Referring to FIG. 1, Fig. 1 is according to depicted in one embodiment of the invention
100 block diagram of driving circuit.In structure, driving circuit 100 includes processing module 120 and counter electromotive force detection module
130.Processing module 120 is electrically connected to counter electromotive force detection module 130 and single-phase DC motor 140, and counter electromotive force detects mould
Block 130 is electrically connected to single-phase DC motor 140.
Hall element 110 is provided on the stator of single-phase DC motor 140 (for convenience of description, by Hall in Fig. 1
Element 110 is painted independently of the outer of single-phase DC motor 140).When magnetic field outer plus vertical with current direction on a conductor,
It can make the electronics in conductor is assembled by Lorentz force to generate electric field, this phenomenon is known as Hall effect, and what is generated is built-in
Voltage is known as Hall voltage.When single-phase DC motor 140 rotates, Hall element 110 detects generated changes of magnetic field, and phase
Export hall signal Hall_s with answering.
When single-phase DC motor 140 is rotated by band, the voltage that will produce in the coil of motor is known as counter electromotive force
(back electromotive force, back-EMF).Counter electromotive force detection module 130 is electrically connected to single-phase DC motor
140, to detect the counter electromotive force Vb of single-phase DC motor 140, and output detection signal Vbs accordingly.For example, it detects
Signal Vbs can be depending on counter electromotive force Vb signals.In an embodiment of the present invention, when counter electromotive force detection module 130 is examined
When the counter electromotive force Vb signals measured are a positive value, counter electromotive force detection module 130 just exports a level (such as：High level) inspection
Signal Vbs is surveyed, when the counter electromotive force Vb detected by the counter electromotive force detection module 130 is a negative value, counter electromotive force detects mould
Block 130 is just exported with second electrical level (such as：Low level) detection signal Vbs.
Thus, which processing module 120 can be according to the hall signal Hall_s transmitted by Hall element 110 and by anti-
The detection signal Vbs and datum that electromotive force detection module 130 transmits, judge the steering of single-phase DC motor 140, and according to this
Control single-phase DC motor 140.
In some embodiments, as shown in Figure 1, processing module 120 also includes control unit 122 and driving unit 124.Control
The hall signal Hall_s that unit 122 processed can be exported in Hall element 110 has detection level (such as：High level) when, it will detect
The level of signal Vbs is compared with a datum, to judge the steering of single-phase DC motor 140.Driving unit 124 is then according to control
The judging result of unit 122 processed selectively drives single-phase DC motor 140.
Referring to FIG. 2, Fig. 2 is 100 schematic diagram of driving circuit depicted in one embodiment of the invention.
In the present embodiment, counter electromotive force detection module 130 has input terminal 132 and output end 134, wherein input terminal
132 electrical connection single-phase DC motors 140, output end 134 is electrically connected control unit 122.Counter electromotive force detection module 130 is by defeated
Enter the counter electromotive force Vb of 132 detection single-phase DC motors 140 of end, and detection signal Vbs is exported to controlling list by output end 134
Member 122.In in structure, counter electromotive force detection module 130 includes diode D1, resistance unit 136 and resistance unit 138.Two
The first end of pole pipe D1 is (such as：Cathode terminal) it is electrically connected to the input terminal 132 of counter electromotive force detection module 130, resistance unit 136
First end is electrically connected to the second end of diode D1 (such as：Anode tap), the second end of resistance unit 136 is electrically connected to counter electromotive force
The output end 134 of detection module 130, the first end of resistance unit 138 are electrically connected to resistance unit 136, and the of resistance unit 138
Two ends are electrically connected to voltage source VDD.
In one embodiment, as shown in Fig. 2, resistance unit 136 may include resistance R1 and resistance R3, the two is each other with series connection
Form is electrically connected.Resistance unit 138 may include resistance R2.In some embodiments, resistance unit 136 and resistance unit 138
A plurality of be one another in series or resistance in parallel can be separately included according to actual design demand.
In the present embodiment, the counter electromotive force Vb received by the input terminal 132 of counter electromotive force detection module 130 is just
When value, diode D1 blocks cut-off because of reverse bias, and the output end 134 of counter electromotive force detection module 130 therefore answer by the output phase
Has the first level (such as：High level) detection signal Vbs.In this example, the level maximum of detection signal Vbs does not exceed voltage
The level of source VDD.When counter electromotive force Vb received by the input terminal 132 of counter electromotive force detection module 130 is negative value, two poles
Pipe D1 is connected because of forward bias voltage drop, and the signal of voltage source VDD is divided via resistance unit 136 and resistance unit 138 so that anti-electricity
The output tool of output end 134 second electrical level of kinetic potential detection module 130 is (such as：Low level) detection signal Vbs.For example, if
The level of 138 resistance value having the same of resistance unit 136 and resistance unit, then the detection signal Vbs exported will be voltage source
The half of the level of VDD.The value of this second electrical level can adjust resistance unit 136 and resistance unit 138 according to actual design demand
Resistance value ratio and design.
Please also refer to Fig. 3 A and Fig. 3 B.Fig. 3 A are to be in rotate forward according to single-phase DC motor 140 depicted in an embodiment
When counter electromotive force Vb and hall signal Hall_s waveform diagrams, Fig. 3 B are according to single-phase DC motor depicted in an embodiment
140 in counter electromotive force Vb when inverting and hall signal Hall_s waveform diagrams, and can also be defined as inverting by 3A, and 3B is
It rotates forward.
By Fig. 3 A and Fig. 3 B it is found that the zero-crossing point of the waveform of counter electromotive force Vb is also the positive edge of hall signal Hall_s
Or at negative edge, and the waveform of counter electromotive force Vb has different characteristics when rotating forward and reversion, therefore using hall signal Hall_
The pass of s and counter electromotive force Vb judges the steering of single-phase DC motor 140 at this time.
By Fig. 3 A it is found that when single-phase DC motor 140 is in and rotates forward, hall signal that Hall element 110 is exported
Hall_s can be with the same phases of counter electromotive force Vb, that is to say, that when rotating forward, when hall signal Hall_s has high level, and counter electromotive force
Vb also has high level, and when hall signal Hall_s has low level, counter electromotive force Vb also has low level.Relatively, by
Fig. 3 B it is found that when single-phase DC motor 140 is in reversion, hall signal Hall_s that Hall element 110 is exported can with it is anti-
Electromotive force Vb reverse phases, that is to say, that when reversion, when hall signal Hall_s has high level, counter electromotive force Vb can have low electricity
Flat, when hall signal Hall_s has low level, counter electromotive force Vb can have high level.Thus, work as hall signal
When Hall_s is in high level, the control unit 122 in processing module 120 can judge single-phase according to the polarity of counter electromotive force Vb
D.c. motor 140, which is in, to be rotated forward or inverts, and carries out phase to the driving unit 124 in processing module 120 according to judging result
The control answered.Specifically, control unit 122 can be programmable by microcontroller (Microcontroller Unit), complexity
Logic element (Complex Programmable Logic Device, CPLD), field programmable gate array (Field-
Programmable gate array, FPGA) etc. modes implementation.
However, level of the upper 122 institute's energy received signal level of control unit of system design not necessarily with counter electromotive force Vb
Unanimously, therefore the counter electromotive force Vb outputs detected must be believed for corresponding detection by above-mentioned counter electromotive force detection module 130
The judgement that number Vbs is turned to for control unit 122.The detection signal Vbs that counter electromotive force detection module 130 exports is remained instead
The phase property of electromotive force Vb, when counter electromotive force Vb has low level, the level of detection signal Vbs is less than datum, and
When counter electromotive force Vb has high level, the level of detection signal Vbs is higher than datum.
Thus, which the hall signal Hall_s that control unit 122 can be exported in Hall element 110 has detection level
(such as：High level) when, the level for detecting signal Vbs is compared with datum, and if the level of detection signal Vbs be higher than
If datum, the steering of single-phase DC motor 140 is judged to rotate forward.Relatively, when hall signal Hall_s has detection
Level is (such as：High level) when, if the level of detection signal Vbs judges single-phase DC motor 140 less than if datum
It turns to as reversion.Control unit 122 can be according to being judged as a result, the corresponding control signal CS of output controls driving unit
124 selectively drive single-phase DC motor 140.
Driving unit 124 can be by intelligent power module (Intelligent Power Modules, IPM) implementation.Such as
Shown in Fig. 2, driving unit 124 includes switch Q1, Q2, Q3 and Q4 in one embodiment, and switch Q1, Q2, Q3 and Q4 are respectively by opening
OFF signal S1, S2, S3 and S4 are controlled.Control unit 122 can include the control of switching signal S1, S2, S3 and S4 by output
Signal CS controls the operation of switch Q1, Q2, Q3 and Q4 respectively, drives single-phase DC motor 140 whereby.For example, work as control
When unit 122 judges that single-phase DC motor 140 inverts, can send out control signal CS makes switch Q1 and Q2 cut-off, switch Q3 and Q4
Conducting, to carry out brake control to single-phase DC motor 140.According to the design of different driving unit 124, signal CS is to list for control
The control of phase d.c. motor 140 can also be realized that embodiments of the present invention are not exemplified as limiting with above-mentioned by various different modes.
Thus, single-phase DC motor can be utilized according to the comparison of hall signal Hall_s and detection signal Vbs
140 when different steerings counter electromotive force Vb characteristic, judge the steering of single-phase DC motor 140 and controlled.
Counter electromotive force detection module 130 also can by comparing device by number in a manner of implementation, please refer to Fig.4.According to Fig. 4
Drive circuit schematic diagram depicted in another embodiment of the present invention.In the present embodiment, counter electromotive force detection module 130 include than
Compared with device OP1, the first input end of comparator OP1 is electrically connected to the input terminal 132 of counter electromotive force detection module 130 to receive list
The second input terminal of the counter electromotive force Vb of phase d.c. motor 140, comparator OP1 are electrically connected to reference voltage Vref, comparator OP1
Output end be electrically connected to the output end 134 of counter electromotive force detection module 130 to export detection signal Vbs.
In the present embodiment, when the voltage level of the counter electromotive force Vb of single-phase DC motor 140 is higher than reference voltage Vref
Level when, comparator OP1 just the output phase should have the first level (such as：High level) detection signal Vbs.Relatively, work as list
When the voltage level of the counter electromotive force Vb of phase d.c. motor 140 is less than the level of reference voltage Vref, comparator OP1 just the output phases
There should be second electrical level (such as：Low level) detection signal Vbs, wherein reference voltage Vref can be by voltage source VDD by series connection
Resistance is divided and is obtained.
In the present embodiment, the hall signal Hall_s that control unit 122 can equally be exported in Hall element 110 has inspection
Survey level (such as：High level) when, the level for detecting signal Vbs is judged, and corresponding according to institute's result of the comparison output
Signal CS is controlled, driving unit 124 is controlled whereby and selectively drives single-phase DC motor 140.Specific comparison and controlling party
Method is disclosed in detail in previous paragraph, is repeated no more in this.
In addition, counter electromotive force detection module 130 also can be used to detect counter electromotive force Va and Vb more than two, and export multiple
Several detection signal Vas and Vbs, please refer to Fig. 5.Fig. 5 is the driving circuit signal depicted in further embodiment of this invention
Figure.
In the present embodiment, counter electromotive force detection module 130 have input terminal 132a and 132b and output end 134a and
134b.In in structure, input terminal 132a and 132b are electrically connected in single-phase DC motor 140 to receive two groups of counter electromotive force Va
And Vb, output end 134a and 134b are electrically connected to control unit 122 to export detection signal Vas and Vbs respectively.
In the present embodiment, counter electromotive force detection module 130 includes diode D1, resistance unit 136b and resistance unit
138b.The first end of diode D1 is (such as：Cathode terminal) it is electrically connected to the input terminal 132b of counter electromotive force detection module 130, resistance
The first end of unit 136b is electrically connected to the second end of diode D1 (such as：Anode tap), the second end of resistance unit 136b is electrically connected
It is connected to the output end 134b of counter electromotive force detection module 130, the first end of resistance unit 138b is electrically connected to resistance unit 136b,
The second end of resistance unit 138b is electrically connected to voltage source VDD.By this circuit structure, counter electromotive force detection module 130 it is defeated
Outlet 134b to export correspond to single-phase DC motor one group of counter electromotive force Vb detection signal Vbs.Its details is in elder generation
Previous paragraphs are disclosed in detail, and are repeated no more in this.
In addition, counter electromotive force detection module 130 also includes diode D2, resistance unit 136a and resistance unit 138a.
The first end of diode D2 is (such as：Cathode terminal) it is electrically connected to the input terminal 132a of counter electromotive force detection module 130, resistance unit
The first end of 136a is electrically connected to the second end of diode D2 (such as：Anode tap), the second end of resistance unit 136a is electrically connected to
The first end of the output end 134a of counter electromotive force detection module 130, resistance unit 138a are electrically connected to resistance unit 136a, resistance
The second end of unit 138a is electrically connected to voltage source VDD.Company between diode D2, resistance unit 136a and resistance unit 138a
The connection pass connect between pass and diode D1, resistance unit 136b and resistance unit 138b is approximate.By this circuit structure, anti-electricity
The output end 134a of kinetic potential detection module 130 to export correspond to single-phase DC motor another group of counter electromotive force Va detection
Signal Vas, details are disclosed in detail in previous paragraph, are repeated no more in this.
In the present embodiment, 130 exportable two groups of detection signals Vas and Vbs of counter electromotive force detection module.According to practical need
It asks, the level of the level for detecting signal Vas and detection signal Vbs can be compared with datum by control unit 122 respectively,
And according to being judged as a result, the corresponding control signal CS controls driving unit 124 of output selectively drives single-phase DC horse
Up to 140.
In addition, above-mentioned two groups of detections signal Vas and Vbs also may be used in addition to can be by two groups of analogous circuit implementations
As disclosed in leading portion, by comparing device in a manner of two groups of digital circuits implementation, also can by one group of analogous circuit, set of number electricity
The variation patterns such as road realize that the above embodiments are only for example, and are not limited to the present invention, the various waves using counter electromotive force
Shape Feature Conversion is mode for detecting signal and combinations thereof, retouching, such as counter electromotive force detection module in the aforementioned embodiment
Filter circuit is added in 130 with stable detection signal, or level that clamp circuit adjustment detection signal is added etc. modification, also
The practical range of the present invention is not departed from.
In conclusion the present invention judges single-phase DC motor by applying above-described embodiment, using analogy or digital circuit
140 steering can simplify the system in prior art using only Hall element and design, reduce the foot position used needed for control unit
Quantity reduces cost.
The another way of the present invention is a kind of method that detection motor turns to, for convenience and for the sake of clear explanation, Xia Shufang
Method collocation embodiment shown in FIG. 1 illustrates together, however is not limited thereto.In one embodiment, the side that detection motor turns to
Method comprises the steps of.First, the counter electromotive force Vb of detection single-phase DC motor 140, and corresponding output detects signal
Vbs.Then, the hall signal Hall_s that the Hall element 110 built in single-phase DC motor 140 exports is received.Finally, according to inspection
Survey the steering that signal Vbs and hall signal Hall_s judges single-phase DC motor 140.
In some embodiments, the step of output detection signal Vbs can more be comprised the steps of.When counter electromotive force Vb is
Timing, output have the first level (such as：High level) detection signal Vbs.When counter electromotive force Vb is negative, output has one the
Two level are (such as：Low level) detection signal Vbs.
In other embodiments, the step of output detection signal Vbs can more be comprised the steps of.First, compare
Counter electromotive force Vb and reference voltage Vref.When the level of counter electromotive force Vb is more than the level of reference voltage Vref, output has
First level is (such as：High level) detection signal Vbs；When the level of counter electromotive force Vb is less than the level of reference voltage Vref,
Output has second electrical level (such as：Low level) detection signal Vbs.
In some embodiments, the method for detection motor steering also includes：Detect another anti-electricity of single-phase DC motor 140
Kinetic potential Va, and corresponding output detection signal Vas.Judge single-phase DC according to detection signal Vas and hall signal Hall_s
The steering of motor 140.
How technical field tool usually intellectual can be directly acquainted with the method based on the driving in above-described embodiment
Circuit 100 is to execute such operation and function, therefore no longer this is repeated.
In above-mentioned content, including illustrative step.However these steps not necessarily sequentially execute.In this implementation
The step of mentioned in mode, can adjust its tandem, or even can be same in addition to especially chatting its bright sequence person according to actual needs
When or part be performed simultaneously.
The another mode of the present invention is a kind of startup method of the motor using above-mentioned steering detection.Please refer to Fig. 6.Fig. 6
For the flow chart of the startup method 600 of the motor depicted in one embodiment of the invention.For convenience and for the sake of clear explanation, under
It states method collocation embodiment shown in FIG. 1 together to illustrate, however it is not limited thereto.
Startup method 600 includes step S610, S620, S630, S640, S650, S660, S670, S700.Starting method
By the steering detection method of application above-described embodiment in 600, single-phase DC motor 140 is controlled accordingly, with protection
Single-phase DC motor 140 causes overcurrent that inner body is caused to burn since single-phase DC motor 140 inverts when avoiding starting.
First, in step S610, pass through the hall signal of the output of Hall element 110 built in single-phase DC motor 140
Hall_s judges whether single-phase DC motor 140 is dynamic.Specifically, the hall signal that can be exported by Hall element 110
Hall_s judges whether the rotor of single-phase DC motor 140 is dynamic.Similarly, the single-phase DC motor described in following paragraphs
140, in dynamic, static, rotating forward or reversion situation, can all censure single-phase DC horse respectively in an embodiment of the present invention
Rotor up to 140 is in dynamic, static, rotating forward or reversion situation.If single-phase DC motor 140 is in static state, because single-phase
140 internal magnetic field of d.c. motor does not generate variation, therefore hall signal Hall_s there will not be variation.Relatively, if it is single-phase
D.c. motor 140 is in dynamic, and whether forward or reverse, Hall element 110 all can export the period because internal magnetic field changes
The hall signal Hall_s of property.Therefore, control unit 122 can judge that single-phase DC motor 140 is by hall signal Hall_s
No is dynamic.
When single-phase DC motor 140 is judged as static state, single-phase DC motor 140 can safe starting, do not generated
The risk of electric current, just enters step S620 at this time, directly initiates single-phase DC motor 140.When single-phase DC motor 140 is judged
For dynamic when, in step S630 according to detection signal Vbs and hall signal Hall_s judge single-phase DC motor 140 turn
To wherein detection signal Vbs is corresponding with the counter electromotive force Vb of single-phase DC motor 140, details is detailed in previous paragraph
It is open, it is repeated no more in this.
When single-phase DC motor 140 be judged as rotate forward when, single-phase DC motor 140 can safe starting, do not generated
The risk of electric current, just enters step S620 at this time, directly initiates single-phase DC motor 140.When single-phase DC motor 140 is judged
For reversion when, in step S640, corresponding control signal CS is exported to control driving unit 124 by control unit 122,
To carry out brake control to single-phase DC motor 140.This brake control can have various change according to actual demand.For example,
Please also refer to Fig. 2,122 exportable control signal CS of control unit is to make switch Q1 and Q2 end, switch Q3 and Q4 conducting,
The voltage of control input single-phase d.c. motor 140 whereby, to reach brake control.
In step S650, judge after carrying out brake control to single-phase DC motor 140 whether to be dynamic；Work as single-phase DC
When motor 140 is judged as static state, single-phase DC motor 140 can safe starting, do not generate the risk of overcurrent, at this time just into
Enter step S620, directly initiates single-phase DC motor 140.When single-phase DC motor 140 is judged as dynamic, in step S660
In, above-mentioned brake control is released, and judge list again according to detection signal Vbs and hall signal Hall_s in step S670
The steering of phase d.c. motor 140.Similarly, when single-phase DC motor 140 is judged as rotating forward, single-phase DC motor 140 can
Clean boot does not generate the risk of overcurrent, just enters step S620 at this time, directly initiates single-phase DC motor 140.
In abovementioned steps S610~S670, sentencing described in 122 multipass of control unit preceding embodiment of the present invention
Disconnected motor forward method, to confirm the steering of single-phase d.c. motor 140.In this stage, if single-phase DC motor 140 is in
When static or rotating forward, start the risk that 140 no part of single-phase DC motor is burnt, therefore control unit 122 is all exportable
Corresponding control signal CS directly initiates single-phase DC motor 140.
Relatively, when 140 second degree of single-phase DC motor is judged as reversion in step S670, to avoid the when of starting from producing
Raw overcurrent burns inner body, will enter step S700 dynamically to reverse start-up mode to control single-phase DC motor 140
System.If motor can smoothly take back rotating forward in the dynamic of step S700 reverses start-up mode, step S620 is likewise entered, directly
Start single-phase DC motor 140.If motor can not smoothly take back rotating forward in step S700, this startup is abandoned, is returned to just
Beginning state, which reattempts to, starts single-phase DC motor 140.
Specifically, the dynamic of step S700 reverses the details started please also refer to Fig. 7.Fig. 7 is according to the present invention one
Dynamic depicted in embodiment, which reverses, to be started (i.e.：Step S700) detailed flowchart.Step S700 further includes step
S710, S720, S730, S735, S740, S750, S755, S760, S770, S775 and S780.
First, in step S710, judge whether hall signal Hall_s has detection level (such as：High level).When suddenly
Your signal Hall_s not yet has when detecting level (such as：When hall signal Hall_s has low level), in step S720,
Control unit 122 operates in the first stage to control single-phase DC motor 140 according to control signal CS driving driving units 124,
Until hall signal Hall_s has detection level.For example, please also refer to Fig. 2, signal CS is controlled in the first stage
It can be used to control switch Q1 and Q3 conducting, switch Q2 and Q4 are closed, and control unit 122 simultaneously can calculate Hall letter in the first stage
Number Hall_s is in non-detection level (such as：Low level) time span T1.
When hall signal Hall_s has detection level, in step S730, control unit 122 is according to control signal CS
Driving driving unit 124 operates in second stage to control single-phase DC motor 140.Specifically, control unit 122 is adjustable
Control signal CS generates detection signal Vbs corresponding with counter electromotive force Vb to detect counter electromotive force Vb.For example, it asks
Together with reference to figure 2, signal CS is controlled in second stage and can be used to control switch Q2 and Q4 conducting, switch Q1 and Q3 are closed, and
According to the time span T1 calculated in the first stage, the time T2 of switch conduction in second stage is calculated.Due to driving
During single-phase DC motor 140, counter electromotive force Vb can be with other signal superpositions so that 130 nothing of counter electromotive force detection module
Method smoothly detects counter electromotive force Vb and exports corresponding detection signal Vbs, therefore control unit 122 must shift to an earlier date closing control letter
Number CS, that is, the time T1 that enables the time T2 of switch conduction in second stage be less than switch conduction in the first stage, so that instead
Electromotive force detection module 130 smoothly detects counter electromotive force Vb and exports corresponding detection signal Vbs.
After postponing a period of time in step S735, the detection signal Vbs that counter electromotive force detection module 130 is sent out just will not
It is interfered by other signal superpositions, thus, just can be in step S740 according to detection signal Vbs and hall signal
Hall_s judges steering of the single-phase DC motor 140 after the driving of above-mentioned first stage and second stage driving again.Work as list
The steering of phase d.c. motor 140 is to enter step S750 when rotating forward and calculate continuous rotating forward number, the continuous number that rotates forward is enabled to add one,
And this continuous number that rotates forward is judged in step S755 whether up to desired value J, wherein desired value J can be preassigned just whole for one
Number.If the continuous number that rotates forward has reached desired value J, judges that dynamic reverses and start successfully, return to and normally start list in step S620
Phase d.c. motor 140.If continuously rotating forward number not yet reaches desired value J, S770 is entered step, detection number is calculated, enables detection
Number adds one.
When the steering of single-phase DC motor 140 is reversion, then enters step S760 and the continuous number that rotates forward is reset to zero,
And step S770 is likewise entered, detection number is calculated, detection number is enabled to add one.
No matter being in forward or reverse, after step S770 calculates detection number, control unit 122 is sentenced in step S775
Breaking, this detects whether number reaches upper limit of detection value K, and wherein upper limit of detection value K can be a preassigned positive integer, and detect
Limit value K is not less than desired value J.When detection number not yet reaches upper limit of detection value K, repeats above-mentioned dynamic and reverse the step of starting
S710~S775, to judge the steering of single-phase DC motor 140 repeatedly.
When detection number reach upper limit of detection value K, and continuously rotate forward number not yet reach desired value J when, judge dynamic reverse open
It is dynamic failed, it can not be successfully and motor is taken back into rotating forward, just enter step S780 at this time, control unit 122 releases dynamic inverse revolving die
Simultaneously starting protection mechanism avoids continuing to drive leading to overcurrent formula to protect single-phase DC motor 140.For example, machine is protected
System can be all to end switch Q1, Q2, Q3 and Q4, stop powering to single-phase DC motor 140, after waiting for idle several periods
Original state is returned to, again since step S610, attempts starter motor.
For example, in one embodiment, the desired value J for continuously rotating forward number may be configured as 8, and upper limit of detection value K can be set
It is set to 12.In indicating that the dynamic in the present embodiment reverses start-up mode, if system return air is not strong, driving unit 124 smoothly will be single
Phase d.c. motor 140 takes back rotating forward, and when control unit 122 judges 140 continuous eight steerings of single-phase DC motor to rotate forward, just
Judgement single-phase DC motor 140, which dynamically reverses, to be started successfully, and normally startup program is returned to.If being turned to as just at continuous 8 times
Before turning, 12 steering detection cycles are had already been through, such as system return air is too strong motor to be taken back rotating forward by driving
Situation, though or motor was once taken back into rotating forward after aforementioned driving, midway detect again motor reversion cause it is continuous just
Turn the situation etc. of number resetting, just judgement dynamic reverses startup failed.Control unit 122 just releases dynamic inverse rotary-die type at this time
And starting protection mechanism protection single-phase DC motor 140 is in order to avoid lasting driving leads to overcurrent, and it is heavy after several periods of leaving unused
The new original state that returns to attempts starter motor.
The continuous desired value J and upper limit of detection value K for rotating forward number in the present embodiment can be all arranged according to practical application request,
The first stage of step S720 drives tactful, step S780 protection mechanism etc. also can be according to reality with step S730 second stage
Changes in demand.Such as say, step S720 controls signal CS in the first stage and also can be used to control switch Q2 and Q4 conducting, switch
Q1 and Q3 are closed, and step S730, which control signal CS in second stage and also can be used to control switch Q1 and Q3, to be connected, switch Q2 and
Q4 is closed, and can also start other in step S780 and be familiar with the protection mechanism known to this those skilled in the art prevents the generation of overcurrent, on
It is merely illustrative to state institute's illustrated example in embodiment, not limiting the present invention.
In above-mentioned content, including illustrative step.However these steps not necessarily sequentially execute.In this implementation
The step of mentioned in mode, can adjust its tandem, or even can be same in addition to especially chatting its bright sequence person according to actual needs
When or part be performed simultaneously.
In conclusion the present invention by applying above-described embodiment, is judged using the characteristic cooperation hall signal of counter electromotive force
The steering of single-phase DC motor, and the method that further will determine that the steering of single-phase DC motor applies the intelligence in single-phase DC motor
In energy type startup method, circuit pins position can be effectively saved, improves the deficiencies in the prior art, and the appropriate control for passing through control unit
System, reaches when single-phase DC motor is inverted by return air, overcurrent will not be caused to burn inside because of starter motor by force
The effect of part.
Although the content of present invention is disclosed as above with embodiment, content that however, it is not to limit the invention is any ripe
Practise this those skilled in the art, in the spirit and scope for not departing from the content of present invention, when can make it is various change and retouch, therefore in the present invention
The protection domain of appearance should be defined by the scope of the appended claims.
Claims (20)
1. a kind of motor drive circuit, including：
One counter electromotive force detection module is electrically connected to a single-phase DC motor, to detect the one first of the single-phase DC motor
Counter electromotive force, and correspondingly export a first detection signal；And
One processing module is electrically connected to the counter electromotive force detection module and the single-phase DC motor, and the processing module is according to this
One hall signal of the Hall element output built in first detection signal, a datum and the single-phase DC motor, sentences
The steering of the disconnected single-phase DC motor simultaneously controls the single-phase DC motor.
2. motor drive circuit as described in claim 1, wherein when first counter electromotive force is timing, counter electromotive force detection
The first detection signal of module output has the first level of corresponding first counter electromotive force,
When the counter electromotive force is negative, the first detection signal of counter electromotive force detection module output have it is corresponding this first
The second electrical level of counter electromotive force.
3. motor drive circuit as described in claim 1, wherein the counter electromotive force detection module include：
One input terminal is electrically connected to the single-phase DC motor；
One output end is electrically connected to the processing module and to export the first detection signal；
One first diode, including：
One cathode terminal is electrically connected to the input terminal of the counter electromotive force detection module；And
One anode tap；
One first resistor unit, including：
One first end is electrically connected to the anode tap of first diode；And
One second end is electrically connected to the output end of the counter electromotive force detection module；And
One second resistance unit, including：
One first end is electrically connected to the second end of the first resistor；And
One second end is electrically connected to a voltage source.
4. motor drive circuit as described in claim 1, wherein the counter electromotive force detection module include：
One comparator, to compare a reference voltage signal and represent a back-emf signal of first counter electromotive force, and according to
Has the first detection signal of corresponding level with output.
5. motor drive circuit as described in claim 1, the wherein processing module include：
One control unit, wherein when the hall signal of Hall element output has a detection level, which uses
The first detection signal to be compared with the datum；
When the level of the first detection signal is higher than the datum, the steering of the single-phase DC motor is judged as rotating forward,
When the level of the first detection signal is less than the datum, the steering of the single-phase DC motor is judged as inverting.
6. motor drive circuit as claimed in claim 5, the wherein processing module also include：
One driving unit is controlled by the control unit according to the steering of the single-phase DC motor and selectively drives this single-phase
D.c. motor.
7. motor drive circuit as described in claim 1, wherein the counter electromotive force detection module are more single-phase straight to detect this
Flow one second counter electromotive force of motor, and correspondingly one second detection signal of output；
Wherein the processing module judges the steering of the single-phase DC motor also according to the second detection signal and to control this single-phase straight
Flow motor.
8. motor drive circuit as claimed in claim 7, wherein the counter electromotive force detection module include：
One first input end is electrically connected to the single-phase DC motor to detect first counter electromotive force；
One second input terminal is electrically connected to the single-phase DC motor to detect second counter electromotive force；
One first output end is electrically connected to the processing module and to export the first detection signal；
One second output terminal is electrically connected to the processing module and to export the second detection signal；
One first diode, including：
One cathode terminal is electrically connected the first input end of the counter electromotive force detection module；And
One anode tap；
One first resistor unit, including：
One first end is electrically connected to the anode tap of first diode；And
One second end is electrically connected to first output end of the counter electromotive force detection module；
One second resistance unit, including：
One first end is electrically connected to the second end of the first resistor；And
One second end is electrically connected to a voltage source；
One second diode, including：
One cathode terminal is electrically connected second input terminal of the counter electromotive force detection module；And
One anode tap；
One 3rd resistor unit, including：
One first end is electrically connected to the anode tap of second diode；And
One second end is electrically connected to the second output terminal of the counter electromotive force detection module；And
One the 4th resistance unit, including：
One first end is electrically connected to the second end of the 3rd resistor；And
One second end is electrically connected to the voltage source.
9. motor drive circuit as claimed in claim 8, the wherein processing module include：
One control unit, wherein when the hall signal of Hall element output has a detection level, which uses
The first detection signal and the second detection signal to be compared with a datum, to judge the single-phase DC motor
It turns to.
10. a kind of method that detection motor turns to, including：
Detect one first counter electromotive force of a single-phase DC motor, and one first detection signal of corresponding output；
Receive a hall signal of the Hall element output built in the single-phase DC motor；And
The steering of the single-phase DC motor is judged according to the first detection signal and the hall signal.
11. method as claimed in claim 10, wherein the step of exporting the first detection signal also includes：
When first counter electromotive force is timing, the first detection signal of output with a first voltage level；And
When first counter electromotive force is negative, the first detection signal with a second voltage level is exported.
12. method as claimed in claim 10, wherein the step of exporting the first detection signal also includes：
Compare the counter electromotive force and a reference voltage；
When the counter electromotive force is more than the reference voltage, the first detection signal with one first level is exported；And
When the counter electromotive force is less than the reference voltage, the first detection signal with a second electrical level is exported.
13. method as claimed in claim 10, also includes：
Detect one second counter electromotive force of the single-phase DC motor, and one second detection signal of corresponding output；And
The steering of the single-phase DC motor is judged according to the second detection signal and the hall signal.
14. a kind of startup method of motor, including：
Whether one hall signal of the Hall element output built in a single-phase DC motor judges the single-phase DC motor
For dynamic；
When the single-phase DC motor is judged as static state, the single-phase DC motor is directly initiated；
When the single-phase DC motor is dynamic, which is judged according to a first detection signal and the hall signal
Steering, the wherein first detection signal is corresponding with one first counter electromotive force of the single-phase DC motor；And
According to the course changing control of the single-phase DC motor single-phase DC motor.
15. method as claimed in claim 14, wherein the step of controlling the single-phase DC motor also includes：
When the single-phase DC motor is to rotate forward, the single-phase DC motor is directly initiated；
When the single-phase DC motor is reversion, a brake is carried out to the single-phase DC motor and is controlled；
Judge after carrying out the brake control to the single-phase DC motor, whether which is dynamic；
When being judged as static state after carrying out the brake control to the single-phase DC motor, the single-phase DC motor is directly initiated；
And
When being judged as dynamic after carrying out the brake control to the single-phase DC motor, brake control is released, and according to one
First detection signal and the hall signal judge that the steering of the single-phase DC motor, the wherein first detection signal are single-phase straight with this
One first counter electromotive force for flowing motor is corresponding；And
According to the course changing control of the single-phase DC motor single-phase DC motor.
16. method as claimed in claim 15, wherein the step of controlling the single-phase DC motor also includes：
When after the single-phase DC motor releasing brake control to rotate forward, start the single-phase DC motor.
17. the method described in claim 16, wherein when being reversion after the single-phase DC motor releases brake control, with
The step of one dynamic inverse rotary-die type controls the single-phase DC motor, the dynamic inverse rotary-die type also include：
Drive a driving unit to operate in a first stage to control the single-phase DC motor according to a control signal, until this suddenly
Your signal has a detection level.
18. method as claimed in claim 17, wherein when the hall signal has the detection level, the dynamic inverse rotary-die type
The step of also include：
The driving unit is driven to operate in a second stage to control the single-phase DC motor according to the control signal；
The steering of the single-phase DC motor is judged according to the first detection signal and the hall signal；
It when the steering of the single-phase DC motor is to rotate forward, calculates one and continuously rotates forward number, when the continuous rotating forward number is up to a mesh
When scale value, releases the dynamic inverse rotary-die type and start the single-phase DC motor；
When the steering of the single-phase DC motor is reversion, which is reset to zero；And
Calculate a detection number.
19. method as claimed in claim 18, wherein the step of driving the driving unit to operate in the second stage also includes：
The control signal is adjusted to detect first counter electromotive force；And
Generate the first detection signal corresponding with first counter electromotive force.
20. method as claimed in claim 18, wherein the step of dynamic inverse rotary-die type also include：
When the detection number is up to a upper limit of detection value, the dynamic inverse rotary-die type is released to protect the single-phase DC motor.
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| CN106059411B (en) * | 2016-07-28 | 2018-10-30 | 广东威灵电机制造有限公司 | Recognition methods, device and the motor of electric motor starting state |
| TWI687041B (en) * | 2019-08-13 | 2020-03-01 | 茂達電子股份有限公司 | Motor starting device and method |
| TWI738573B (en) * | 2020-11-24 | 2021-09-01 | 致新科技股份有限公司 | Motor controller |
| US11658591B2 (en) | 2020-11-26 | 2023-05-23 | Global Mixed-Mode Technology Inc. | Motor controller |
| CN113258846B (en) * | 2021-06-24 | 2021-10-15 | 峰岹科技(深圳)股份有限公司 | Motor starting state detection device and method based on magnetic field orientation control and medium |
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