CN101222195B - Driving mechanism and method for single phase motor - Google Patents
Driving mechanism and method for single phase motor Download PDFInfo
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- CN101222195B CN101222195B CN2007100008728A CN200710000872A CN101222195B CN 101222195 B CN101222195 B CN 101222195B CN 2007100008728 A CN2007100008728 A CN 2007100008728A CN 200710000872 A CN200710000872 A CN 200710000872A CN 101222195 B CN101222195 B CN 101222195B
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000008929 regeneration Effects 0.000 claims abstract description 33
- 238000011069 regeneration method Methods 0.000 claims abstract description 33
- 238000004804 winding Methods 0.000 claims description 41
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 2
- 230000001172 regenerating effect Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 15
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- 241000220317 Rosa Species 0.000 description 1
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Abstract
The invention relates to a drive unit and a drive method of a single-phase motor, wherein two drive currents of the same direction are provided for a single-phase coil by means of a drive transistor group and an auxiliary drive transistor group; moreover, a control unit controls the switching on/off of the drive transistor group and the auxiliary drive transistor group according to the rotation position of the rotating device of a single-phase motor; therefore, drive current regeneration of the single-phase coil is realized so as to reduce the vibration and noise of the single-phase motor and prevent the halted state of the single-phase motor.
Description
Technical field
The present invention relates to a kind of single-phase motor, particularly a kind of drive unit of single-phase motor and driving method.
Background technology
Please refer to the drive unit of Figure 1A～Fig. 1 C explanation about single-phase motor in the prior art, Figure 1A～Figure 1B is the block schematic diagram of drive unit of the single-phase motor of prior art, and Fig. 1 C is the sequential chart of drive unit internal signal of the single-phase motor of prior art.The drive unit of this prior art comprises 102,104,108 and 110, two regeneration of four driving transistorss diode 112 and 114, single phase winding 106, Hall element 116, comparison circuit 118, absolute value circuit 120, checkout gear 122 and control circuit 132.
At first, the position of rotation of Hall element 116 corresponding single-phase motors, the pole change of promptly corresponding rotor-side in opposite directions and sine wave output signal.Then, the sine wave signal waveform shaping that comparison circuit 118 is exported Hall element 116 is a square-wave signal, and this square-wave signal is the turn of tidal stream signal.Absolute value circuit 120 then compares the position standard of sine wave signal with fiducial value, the output timing signal is with the drive current of regeneration single phase winding 106.Comparison circuit 130 can be according to the relatively charging/discharging voltage and the size of reference voltage V REF of the non-ground connection side of electric capacity 124, judges the rotation of single-phase motor or stops, and detects signal with output " H " and represents to rotate, and " L " detection signal is represented to stop.
At last, control circuit 132 can be according to the output valve of checkout gear 122, the output that comes computing comparison circuit 118 and absolute value circuit 120.When detection signal is " L ", output drive signal A1, B1, C1, D1, and when detection signal is " H ", output drive signal A2, B2, C2, D2.
Because therefore the sine wave signal of the 180 degree phase differences with solid line and dotted line of Hall element 116 outputs has the appearance (the turn of tidal stream point of drive current) of zero crossover point, putting with this is center direction expansion forwards, backwards.
When drive signal A2, D2 rise, driving transistors 102,104 meeting ON, the drive current directions that flow at single phase winding 106 can become the paper right.When descending along with drive signal A2, only driving transistors 104 is understood ON, this moment the dotted line that drive current is formed at single phase winding 106, driving transistors 104 and regeneration diode 112 the regeneration path, and, consume at leisure and become zero along with time decreased by circular regeneration path, clockwise direction ground.When drive signal D2 also descended, driving transistors 104 can OFF at zero crossover point.
When drive signal B2, C2 rose, driving transistors 108,110 can ON, the drive current on single phase winding 106 be the paper left to.When drive signal C2 descended, only driving transistors 110 can ON.Therefore drive current is by the regeneration path of some chain lines that constantly circulate counterclockwise, and slow consumption also is reduced to zero in time.When drive signal B2 also descended, driving transistors 110 can OFF.
Please refer to shown in Fig. 2 A～Fig. 2 B, it is respectively the partial circuit schematic diagram of drive unit of single-phase motor of another embodiment of prior art, and the sequential chart of the drive unit internal signal of single-phase motor.
Transistor the 2, the 4th is supplied with the drive current of unidirectional coil 6 in the paper right according to the drive signal A, the D that are provided.The collection utmost point-emitter-base bandgap grading the path of the collection of transistor 2 utmost point-emitter-base bandgap grading path, unidirectional coil 6 and transistor 4 is connected in series between power Vcc and the ground connection Vss for this reason.Transistor the 8, the 10th, according to the drive signal C, the B that are provided supply with unidirectional coil 6 again the paper left to drive current.For this reason, the collection utmost point of the collection of transistor 8 utmost point-emitter-base bandgap grading path, unidirectional coil 6 and transistor 10-emitter-base bandgap grading path series connection is attached between power Vcc and the ground connection Vss.Therefore, transistor 2,4 and transistor the 8, the 10th, conducting complementally or close, and make the nonreversing motor rotation according to the drive current direction that changes unidirectional coil 6 aptly.
Yet, the variation sequential of drive signal A, B, C, D is a little skew only, when transistor 2,4 and transistor 8,10 conductings complementally or when closing, drive current on the unidirectional coil 6 has the oblique line idle current that almost is helpless to change distance, make the direction of drive current of unidirectional coil 6 change rapidly, thus, nonreversing motor has the big problem of vibration, noise and power consumption.
Summary of the invention
A kind of drive unit of single-phase motor and driving method, utilize a driving transistors group and a process auxiliary drive transistor group to provide two equidirectional drive currents to single phase winding, again the conducting that comes controlling and driving transistor group and process auxiliary drive transistor group according to the position of rotation of the whirligig of single-phase motor with a control unit with close, make the drive current regeneration on the single phase winding, to reach vibration, the noise that reduces single-phase motor and to prevent that single-phase motor from presenting the purpose of the halted state that can't start.
Drive unit of the present invention comprises a Hall element, an amplifying circuit, an absolute value circuit, a control unit, two driving transistors groups, two process auxiliary drive transistor groups, two regeneration diode group and single phase windings.
At first, amplifying circuit and absolute value circuit convert the sine wave signal that Hall element detected to respectively and amplify signal and absolute value signal.Then, control unit will amplify signal and absolute value signal again and deal with and computing, produce a plurality of first simultaneously and drive signal and a plurality of second driving signal.
At last, drive signal and second according to first and drive signal, control the conducting between two driving transistors groups and process auxiliary drive transistor group or close, make to form one in the drive unit and drive the path, or collocation regeneration diode forms again and again means of livelihood footpath again, to drive single-phase motor.
Wherein, the arrangement for detecting that case was carried before the device of auxiliary transistor was avoided using can stop at the position of commutation phase delay pulse at fan, avoids causing the situation that can't restart motor coil.
Description of drawings
Figure 1A～Figure 1B is the block schematic diagram of drive unit of the single-phase motor of prior art;
Fig. 1 C is the sequential chart of drive unit internal signal of the single-phase motor of prior art;
Fig. 2 A is the partial circuit schematic diagram of drive unit of single-phase motor of another embodiment of prior art;
Fig. 2 B is the sequential chart of drive unit internal signal of single-phase motor of another embodiment of prior art;
Fig. 3 A～Fig. 3 B is the block schematic diagram of the drive unit of the single-phase motor of content of the present invention;
Fig. 4 is the block schematic diagram of the control unit of content of the present invention;
Fig. 5 is the driving path schematic diagram of the drive current of content of the present invention;
Fig. 6 is the schematic diagram in the regeneration path of the drive current of content of the present invention;
Fig. 7 is the driving path schematic diagram of the drive current after the commutation of content of the present invention;
Fig. 8 is the regeneration path schematic diagram of the drive current after the commutation of content of the present invention; And
Fig. 9 is the sequential chart of the drive unit internal signal of the single-phase motor of content of the present invention.
Wherein, Reference numeral:
Driving transistors 102,104,108,110, Q1, Q2, Q3, Q4,
Process auxiliary drive transistor Q5, Q6, Q7, Q8
Regeneration diode 112,114, D11, D12, D21, D22
Compare electric capacity 124
Signal adjuster 243
Absolute value circuit 120,230
Amplifying circuit 118,220
Hall element 116,210
Drive signal A1, A2, B1, B2, C1, C2, D1, D2
First drives signal S1, S2, S3, S4
Second drives signal S5, S6, S7, S8
Embodiment
Please refer to Fig. 3 A～Fig. 3 B, it is the block schematic diagram of the drive unit of the single-phase motor of content of the present invention.In the present invention, the drive unit (driving apparatus) of single-phase motor (single phase motor) is made on the integrated circuit, and single phase winding (the single phase coil) L in the single-phase motor is linked to integrated circuit in external mode.
Drive unit comprises a Hall element (hall apparatus) 210, one amplifying circuit 220, an absolute value circuit (absolute value circuit) 230, one control unit 240, two driving transistors groups (drivingtransistor unit), two process auxiliary drive transistor groups (auxiliary driving transistor unit), two regeneration diode groups (recirculating diode unit) and single phase winding L.One driving transistors group is driving transistors Q1, Q4, and another driving transistors group is driving transistors Q2, Q3, and a process auxiliary drive transistor group is process auxiliary drive transistor Q5, Q8, and another process auxiliary drive transistor group is process auxiliary drive transistor Q6, Q7.One regeneration diode group is D11, D12, and another regeneration diode group then is D21, D22.Wherein, the drive current that each process auxiliary drive transistor (Q5, Q6, Q7, Q8) is provided that is to say that all less than each driving transistors (Q1, Q2, Q3, Q4) the transistorized transistor layout of each process auxiliary drive is all less than each driving transistors.
The sine wave signal that the corresponding Hall element 210 of control unit 240 meetings is exported, the amplification signal that absolute value signal that computing and handle is provided by absolute value circuit 230 and amplifying circuit 220 are exported, produce one group first simultaneously and drive signal S1, S2, S3, S4, and one group second drives signal S5, S6, S7, S8.And control unit 240 also comprises one first pulse generator (plus generator), 241, one signal adjuster (signal tuner), 243 and 1 second pulse generator 245, as shown in Figure 4.
After the amplification signal adjustment that first pulse generator 241 is provided amplifying circuit 220, produce a plurality of first drive currents, be respectively S1～S4.The amplification signal that signal adjuster 243 is provided amplifying circuit 220, the absolute value signal that is provided according to absolute value circuit 230 adjusts, second pulse generator 245 can be produced a plurality of second and drive signal according to the adjustment of signal adjuster 243, be respectively S5～S8.
In order further to set forth content of the present invention, please refer to Fig. 3 A～Fig. 3 B, shown in Figure 9, with the action of explanation control unit 240.Fig. 9 is the sequential chart of the drive unit internal signal of the single-phase motor of content of the present invention.
The position of rotation of Hall element 210 corresponding single-phase motors and export sine wave signal with solid line and dotted line (dottedline), and the sine wave signal of the sine wave signal of solid line and dotted line presents the phase difference (differential phase) of 180 degree, therefore when the sine wave signal of solid line is crossing with the sine wave signal of dotted line, can produce one zero crossover points (zero cross point).Then amplifying circuit 220 can adjust sine wave signal, and producing amplifying signal to control unit 240, and this amplifying signal is the turn of tidal stream signal, is the foundation with the first drive current IL1 on the single phase winding L or the second drive current IL2 switching direction.Absolute value circuit 230 can be compared the position standard of sine wave signal with fiducial value, to export the absolute value signal to control unit 240, with the first drive current IL1 or the second drive current IL2 on the regeneration single phase winding.
The absolute value signal that control unit 240 can be provided according to absolute value circuit 230, after carrying out calculation process, output second drives signal S5, S6, S7, S8, in like manner, according to the amplifying signal that amplifying circuit 220 is provided, can directly export first and drive signal S1, S2, S3, S4.
When sine wave signal during near zero crossover point, absolute value circuit 230 can produce an absolute value signal, and promptly phase delay signal (phase delay signal) is formed by many pulse combined.At this moment, the phase delay signal can become one or zero by a change by zero.When sine wave signal when arriving zero crossover point, the phase delay signal can remain on high potential state (being) or low-potential state (being zero).And the phenomenon of signal conversion can appear in the first driving signal S1, S2, S3, S4 that control unit 240 is exported, promptly becomes one or zero by a change by zero.When sine wave signal arrival zero crossover point, the phenomenon of signal conversion can appear in the second driving signal S5, S6, S7, S8, promptly becomes zero by zero change one or by one.
Wherein, the one-pulse time of the phase delay signal of being separated by between S2, the S3 of S1, the S4 of the first driving signal and the first driving signal, and second S5, S8 and second S6, the startup between S7 that drives signal that drives signal is to replace mutually.Second drives the auxiliary transistor that signal S5～S8 driven, and (purpose of Q5～Q8) can provide the part drive current to coil when being normal operation, in addition, when motor shuts down state, avoiding may be because the position of the generation phase delay pulse of original A1～D1 be just in time dropped in the position that stops, and can't restart the situation of motor coil, the arrangement for detecting that case is carried before therefore can avoiding using.
Drive current regeneration action for the single phase winding L that flows through that further sets forth content of the present invention, please refer to Fig. 5～shown in Figure 9, Fig. 5 is the driving path schematic diagram of the drive current of content of the present invention, Fig. 6 is the schematic diagram in the regeneration path of the drive current of content of the present invention, Fig. 7 is the driving path schematic diagram of the drive current after the commutation of content of the present invention, and Fig. 8 is the regeneration path schematic diagram of the drive current after the commutation of content of the present invention.
At first, sine wave signal is not as yet near before zero crossover point, it is high potential state that the first driving signal S1, S4 and second drive signal S5, S8, make driving transistors Q1, Q4 and process auxiliary drive transistor Q5, Q8 understand conducting, and the first driving signal S2, S3 and the second driving signal S6, S7 are low-potential state, make that driving transistors Q2, Q3 and process auxiliary drive transistor Q6, Q7 keep closing.
When driving transistors Q1, Q4 conducting, the first drive current IL1 charges to single phase winding L in the driving path (driving path) of driving transistors Q1, the Q4 of conducting (ON), some solid lines that single phase winding L is formed.Simultaneously, when process auxiliary drive transistor Q5, Q8 conducting, the second drive current IL2 drives in the path at the paper right dotted line that process auxiliary drive transistor Q5, Q8 and the single phase winding L of conducting are formed, to single phase winding L charging, as shown in Figure 5.
Then, when sine wave signal during gradually near zero crossover point, first drives signal S1, S4 can become zero by one, make driving transistors Q1, Q4 close, second drives signal S5, S8 then continues to keep high potential state, makes process auxiliary drive transistor Q5, Q8 continue to keep conducting state.As driving transistors Q1, when Q4 closes, regeneration diode D21, D22 meeting conducting, make the first drive current IL1 of the paper right on the single phase winding L in the regeneration path (recirculating path) of the dotted line that regeneration diode D21, D22, single phase winding L are formed, consume at leisure and become zero along with time decreased.When process auxiliary drive transistor Q5, Q8 continued conducting, the second drive current IL2 of paper right also continued the charging to single phase winding L, as shown in Figure 6.Because much smaller than Q1 and Q4, most of drive current will prolong dashed path regeneration on driving force for auxiliary transistor Q5, Q8.As shown in Figure 7, when sine wave signal had reached zero crossover point, the expression sine wave signal had reached the critical point of commutation, that is to say the critical point (critical point) that has reached commutation in hysteresis effect.At this moment, the first driving signal S1, S2, S3, S4 still keep low-potential state, make that driving transistors Q1, Q2, Q3, Q4 still keep closing, and the second driving signal S5, S8 can become zero by one, make process auxiliary drive transistor Q5, Q8 close, second drives signal S6, S7 can become one by zero, makes process auxiliary drive transistor Q6, Q7 conducting.When process auxiliary drive transistor Q6, Q7 conducting, the second drive current IL2 drives in the path at the dotted line that process auxiliary drive transistor Q6, Q7 and single phase winding L are formed, to single phase winding L charging, make the whirligig of single-phase motor can can't not start once more because sinusoidal wave signal zero crossover point occurs.
After sine wave signal has been crossed zero crossover point, the commutation of expression sine wave signal, at this moment, first drives signal S2, S3 can become one by zero, make driving transistors Q2, Q3 conducting, second drives signal S6, S7 can become one by zero, makes process auxiliary drive transistor Q6, Q7 conducting, and the first driving signal S1, S4 and second drive signal S5, S8 and still keep low-potential state, make that driving transistors Q1, Q4 and process auxiliary drive transistor Q5, Q8 keep closing.
When driving transistors Q2, Q3 conducting, the first drive current IL1 forms in the driving path of a solid line at driving transistors Q2, Q3 and the single phase winding L of conducting, charges to single phase winding L.Because process auxiliary drive transistor Q6, Q7 also are conductings, therefore the second drive current IL2 also continues charging to single phase winding L.
When sine wave signal during again near zero crossover point, first drives signal S2, S3 becomes zero by one, make driving transistors Q2, Q3 close, second drives signal S6, S7 keeps high potential state, make process auxiliary drive transistor Q6, Q7 also keep conducting state, and the first driving signal S1, S4 and second drive signal S5, S8 and still keep low-potential state, make that driving transistors Q1, Q4 and process auxiliary drive transistor Q5, Q8 keep closing.As driving transistors Q2, when Q3 closes, regeneration diode D11, D12 meeting conducting, make on the single phase winding L the paper left to the first drive current IL1 in the charge path of the some solid line that regeneration diode D11, D12, single phase winding L are formed, consume at leisure and become zero along with time decreased.When process auxiliary drive transistor Q6, Q7 continue conducting, the paper left to the second drive current IL2 also continue to charge to single phase winding L.
When sine wave signal reached on zero crossover point again, the expression sine wave signal reached the critical point of commutation again.At this moment, the first driving signal S1, S2, S3, S4 still keep low-potential state, make that driving transistors Q1, Q2, Q3, Q4 still keep closing, and the second driving signal S5, S8 can become one by zero, make process auxiliary drive transistor Q5, Q8 conducting, second drives signal S6, S7 can become zero by one, makes process auxiliary drive transistor Q6, Q7 close.As process auxiliary drive transistor Q6, when Q7 closes, the second drive current IL2 drives in the path at the dotted line that process auxiliary drive transistor Q6, Q7 and the single phase winding L of Fig. 5 are formed, and charges to single phase winding L.Just repeat later above-mentioned action.
First drive current of the direction of single phase winding L is the impulse duration that is produced during near zero crossover point at sine wave signal from the above, reduce and become zero lentamente, and switch to the first drive current IL1 of other direction, therefore can suppress the vibration and the noise of single-phase motor.In addition, when the second drive current IL2 arrived zero crossover point at sine wave signal, moment started or closes, and made and still can continue the charging to single phase winding L at above-mentioned impulse duration, presented the halted state that can't start with the whirligig that prevents single-phase motor.Sine wave signal has the driving signal of a longer sequential to drive driving transistors Q1, Q2, Q3, Q4 before commutation, goes up the generation of electric current surging to prevent single phase winding L.
Though, in embodiment of the present invention, the regeneration diode is arranged at the element outside driving transistors Q1, Q2, Q3, Q4 and process auxiliary drive transistor Q5, Q6, Q7, the Q8 separately, but be not limited thereto, with regard to the regeneration diode, it can be wherein between the two parasitic diode of driving transistors Q1, Q2, Q3, Q4 and process auxiliary drive transistor Q5, Q6, Q7, Q8, thus, significantly reduces the chip size of single-phase motor-driving device.In addition, though the fiducial value that absolute value circuit 230 sets for fixing, also non-ly is subject to this, it also can be variable, the clock signal of characteristic that therefore can corresponding various single-phase motors.
Advantage provided by the present invention is, utilizes two groups of driving signals to drive single-phase motor simultaneously.
Another advantage provided by the present invention is, utilize two drive currents to drive single-phase motor simultaneously, and these drive currents is same direction.
An advantage more provided by the present invention is that sine wave signal still has at least one drive current driving single-phase motor in commutation.
An advantage more provided by the present invention is, has added one group of driving transistors of exporting less drive current, makes sine wave signal in commutation, and single-phase motor still can be driven.
An advantage more provided by the present invention is, utilizes the one group of regeneration diode and the single phase winding of arranging in pairs or groups to come combination regeneration path or driving path.
An advantage more provided by the present invention is that sine wave signal has a driving signal than long sequential to drive driving transistors, to prevent the generation of electric current surging on the single phase winding before commutation.
Accompanying drawing provides with reference to using with explanation, is not to be used for the present invention is limited.Just the above only is a preferable possible embodiments of the present invention; so scope of patent protection that is not intended to limit the invention; so, all be contained in equally in the scope of the present invention, hereby Chen Ming as long as the equivalent structure that utilization specification of the present invention and accompanying drawing content are carried out changes.
Claims (11)
1. the drive unit of a single-phase motor is characterized in that comprising:
One driving transistors group in order to according to one first driving signal group, is supplied first drive current to a single phase winding of a direction;
One process auxiliary drive transistor group, in order to drive the signal group according to one second, one second drive current of supplying equidirectional is to described single phase winding;
One control unit, in order to a position of rotation according to a whirligig of described single-phase motor, control between described driving transistors group and described auxiliary transistor group conducting with close, with described first drive current and described second drive current of regenerating; And
One regeneration diode group forms again and again means of livelihood footpath in order to the described single phase winding of arranging in pairs or groups, with described first drive current of regenerating;
Wherein, described first driving signal group and the described second driving signal group produce simultaneously;
Described position of rotation is controlled described first and is driven signal group and the described second driving signal group, and described drive unit makes first drive current regeneration on the described single phase winding.
2. the drive unit of single-phase motor according to claim 1 is characterized in that the described first driving signal group starts, and cuts out before rotating to the commutation position after a whirligig of described single-phase motor rotates to the commutation position.
3. the drive unit of single-phase motor according to claim 1 is characterized in that described second drives the signal group and start or close when described whirligig rotates to the commutation position.
4. the drive unit of single-phase motor according to claim 1 is characterized in that the more described second driving signal group of commutation delay sequential of the described first driving signal group is big.
5. the drive unit of single-phase motor according to claim 1 is characterized in that described first drive current is greater than described second drive current.
6. the drive unit of single-phase motor according to claim 1 is characterized in that described control unit comprises one first pulse generator, one second pulse generator and a signal adjuster.
7. the driving method of a single-phase motor is characterized in that comprising:
Detect the position of rotation of a whirligig of described single-phase motor, produce a sine wave signal;
Adjust described sine wave signal, amplify signal to produce one of tool hysteresis effect;
Accurate and the fiducial value in the position of the described sine wave signal of computing is to produce an absolute value signal;
Computing is also handled described amplification signal and described absolute value signal, drives signal and a plurality of second driving signal to produce a plurality of first simultaneously;
According to the described first driving signal, make a driving transistors group export one first drive current;
According to the described second driving signal, make a process auxiliary drive transistor group export one second drive current;
According to described sine wave signal, control the conducting of described driving transistors group and described process auxiliary drive transistor group and close regenerate described first drive current and described second drive current; And
Reach or described second drive current according to described first drive current, drive described whirligig, make its rotation;
Wherein, described first drive current and described second drive current are equidirectional, and described first drives signal and produce simultaneously with the described second driving signal.
8. the driving method of single-phase motor according to claim 7 is characterized in that described first drives the signal group at described sine wave signal during near one zero crossover points, becomes one or become zero by one by zero.
9. the driving method of single-phase motor according to claim 7 is characterized in that described second drives signal when described sine wave signal arrives one zero crossover points, becomes zero by zero change one or by one.
10. the driving method of single-phase motor according to claim 7 is characterized in that the more described second driving signal of commutation delay sequential of the described first driving signal is big.
11. the driving method of single-phase motor according to claim 7 is characterized in that described first drive current is greater than described second drive current.
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| CN2007100008728A CN101222195B (en) | 2007-01-12 | 2007-01-12 | Driving mechanism and method for single phase motor |
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| CN2007100008728A CN101222195B (en) | 2007-01-12 | 2007-01-12 | Driving mechanism and method for single phase motor |
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| CN101222195B true CN101222195B (en) | 2010-08-18 |
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| CN101800511B (en) * | 2009-02-11 | 2012-07-25 | 晶致半导体股份有限公司 | Single-phase motor-driving device with energy saving module |
| CN103630702B (en) * | 2013-11-05 | 2016-08-17 | 成都发动机（集团）有限公司 | For Electrical-isolationaccurate accurate digital type measuring interface circuit for alternating current speed measuring motor |
| TWI775180B (en) * | 2020-10-16 | 2022-08-21 | 茂達電子股份有限公司 | Driving circuit for single phase motor and driving method for the same |
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