CN104868802B - Sofe Switch control module and driven by Brush-Less DC motor system - Google Patents
Sofe Switch control module and driven by Brush-Less DC motor system Download PDFInfo
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- CN104868802B CN104868802B CN201510236520.7A CN201510236520A CN104868802B CN 104868802 B CN104868802 B CN 104868802B CN 201510236520 A CN201510236520 A CN 201510236520A CN 104868802 B CN104868802 B CN 104868802B
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Abstract
A kind of Sofe Switch control module, including：ADJ control units are connected with delay unit and comparator, inputted with obtaining the tach signal of DC brushless motor and obtaining speed-regulating signal according to tach signal to comparator first input end, while being obtained respectively according to speed-regulating signal, Sofe Switch electric current declines, the rise time reaches delay unit；OSC oscillators are connected with comparator, are inputted with producing the sawtooth signal of predetermined period to the input of comparator second；Delay unit is connected with logic unit, by the switch control logic signal time-delay soft switch electric current down or up time of an at least power switch pipe for acquisition；Comparator is connected with logic unit, and PWM waveform is produced to compare speed-regulating signal and sawtooth signal；Logic unit is connected with driver element, to modulate driver element according to the output of delay unit and comparator；Driver element is connected with power switch pipe, to control its Sofe Switch.The present invention realizes ultra-low noise and EMI, it is to avoid efficiency decline.
Description
Technical field
Driven by Brush-Less DC motor is applied to the present invention relates to driven by Brush-Less DC motor technical field, more particularly to one kind
The gradual change dutycycle Sofe Switch control module and driven by Brush-Less DC motor system of circuit.
Background technology
In the design of Brushless DC Motor Drive Circuit, driven for unidirectional motor, as long as with one high-power three
Pole pipe or the direct drive motor of FET or relay；Drive, can be used by 4 power members for two-way motor
The H-bridge circuit or the relay using a DPDT of part composition；If necessary to speed governing, triode, field effect can be used
Should the switch element such as pipe realize PWM (pulse width modulation) speed governing.
With reference to Fig. 1, a kind of rough schematic view of typical brush DC monophase machine drive circuit.As shown in figure 1, motor
(inductance Motor is reduced in schematic diagram) is connected to output A points and B by 4 power switch S1-S4 power inverters constituted
Between point, by controlling four power switch of inverter H bridge arms to change current of electric direction.When S1 and S4 conductings, S2 and S3
During disconnection, current of electric flows to B ends from A ends respectively；When S1 and S4 is disconnected, and S2 and S3 are turned on, electric current flows to A ends from B ends.Change
The sequence of movement difference of four power switch can produce different current waveforms during phase.Below with from electric current A to B commutations to electric current
Exemplified by B to A process, the current diagram of traditional switch and modified switch is provided.
With reference to Fig. 2, current diagram during traditional switch commutation.The switching sequence of traditional switch is：S1, S4 be both turned on →
S1, S4 disconnect → and dead band → S2, S3 be both turned on；In dead time, four switches disconnect.Due to the afterflow of motor inductances
Effect, electric current is by by S2 and S3 parasitic diode afterflow, as shown in Figure 2.Now A terminal voltages are about-Vdio, B terminal voltages are about
For Vbus+Vdio, the very big V of inductance Motor both end voltages differenceAB=-(Vbus+2Vdio), electric current drastically declines during commutation, therefore
Referred to as high-speed switch.Its defect is that curent change is too fast, causes noise and EMI (Electro Magnetic Interference
Electromagnetic interference).
With reference to Fig. 3, current diagram during a kind of modified switch commutation.Modified switch switching sequence be：S1, S4 are equal
Conducting → S1 conductings, S4 disconnections → 1 → S2 of dead band disconnections, S3 conductings → 2 → S2 of dead band, S3 are both turned on.In dead band 1, inductance
Motor two ends electric current declines；In dead band 2, inductance Motor two ends electric current rises.As shown in figure 3, in dead band 1, electric current leads to
Cross S3 parasitic diode afterflow；A terminal voltages are Vbus, and B terminal voltages are Vbus+Vdio, inductance Motor both end voltages difference very little
VAB=-Vdio, mainly by the anti-raw electrodynamic type of motor in itself to reduce electric current, therefore also referred to as switch at a slow speed.Its advantage is electric current
Change is slow, and noise is small；It has the disadvantage electric current linear change, and dead time is fixed, and exists for the motor of different electric currents and rotating speed
The problem of efficiency declines.
The content of the invention
It is an object of the present invention to for the problem of brush DC monophase machine drive circuit is present in the prior art, carrying
For a kind of Sofe Switch control module and driven by Brush-Less DC motor system, gradual change dutycycle Sofe Switch is realized, in commutation process
Middle current non-linear is slowly varying, and waveform is more smooth, realizes ultra-low noise and EMI.
To achieve the above object, the invention provides a kind of Sofe Switch control module, it is adaptable to driven by Brush-Less DC motor
System, the driven by Brush-Less DC motor system includes DC brushless motor and an at least power switch pipe, Sofe Switch control
Module includes：One ADJ control units, an OSC oscillators, a delay unit, a comparator, a logic unit and a driving are single
Member；The ADJ control units are connected with the delay unit and comparator respectively, the rotating speed for obtaining DC brushless motor
Signal, and according to being inputted after tach signal acquisition speed-regulating signal to the first input end of the comparator, while according to institute
Speed-regulating signal is stated to obtain Sofe Switch downslope time and Sofe Switch current rise time respectively and transmit to the delay unit；
The OSC oscillators are connected with the comparator, the sawtooth signal for producing predetermined period, and input to the comparator
The second input；The delay unit is connected with the logic unit, for an at least power switch described in getting
The switch control logic signal delay Sofe Switch downslope time of pipe is inputted after Sofe Switch current rise time to institute
State logic unit；The comparator is connected with the logic unit, is produced for comparing the speed-regulating signal and sawtooth signal
The adjustable PWM waveform of dutycycle, and input to the logic unit；The logic unit is connected with driver element, for basis
The driver element is modulated in the output of the delay unit and comparator；The driver element and an at least power switch pipe
It is connected, the Sofe Switch for controlling an at least power switch pipe.
To achieve the above object, present invention also offers a kind of driven by Brush-Less DC motor system, including a brush DC
Motor and at least a power switch pipe, an at least power switch pipe are electrically connected the DC brushless motor, pass through control
An at least power switch pipe described in system changes the DC brushless motor sense of current, the driven by Brush-Less DC motor system
Including Sofe Switch control module of the present invention；The ADJ control units in the Sofe Switch control module are coupled to institute
The position sensor of DC brushless motor is stated, DC brushless motor is obtained with the position input signal according to the position sensor
Tach signal；The delay unit in the Sofe Switch control module is coupled to the position sensing of the DC brushless motor
Device, is believed with the switch control logic of an at least power switch pipe described in the position input signal acquisition according to the position sensor
Number；The driver element in the Sofe Switch control module is electrically connected an at least power switch pipe, described to control
At least Sofe Switch of a power switch pipe.
The advantage of the invention is that：The driven by Brush-Less DC motor system that the present invention is provided realizes that gradual change dutycycle is soft to be opened
Close, current non-linear is slowly varying in commutation process, and waveform is more smooth, realizes ultra-low noise and EMI.Meanwhile, during commutation
Between change with motor speed, rotating speed is faster, and the time is shorter, thus avoid efficiency decline.
Brief description of the drawings
Fig. 1, a kind of rough schematic view of typical brush DC monophase machine drive circuit；
Fig. 2, current diagram during traditional switch commutation；
Fig. 3, current diagram during a kind of modified switch commutation；
Fig. 4, the schematic diagram of the embodiment of driven by Brush-Less DC motor system one of the present invention；
Fig. 5, the schematic diagram of the embodiment of ADJ control units one of the present invention；
Fig. 6, current diagram during switch commutation shown in the embodiment of driven by Brush-Less DC motor system one of the present invention；
Fig. 7 is the work wave schematic diagram of each node of embodiment described in Fig. 6.
Embodiment
The Sofe Switch control module and driven by Brush-Less DC motor system provided below in conjunction with the accompanying drawings the present invention is done in detail
Describe in detail bright.
With reference to Fig. 4, the schematic diagram of the embodiment of driven by Brush-Less DC motor system one of the present invention.The direct current without
Brush motor drive system is including a DC brushless motor (illustrating DC brushless motor in figure with position sensor 49) and at least
One power switch pipe, an at least power switch pipe is electrically connected the DC brushless motor, a Sofe Switch control module 40.
The DC brushless motor can be single-phase/three-phase DC brushless motor；Changed by an at least power switch pipe described in control
Become the DC brushless motor sense of current；The Sofe Switch control module 40 is to control an at least power switch pipe
Sofe Switch.An at least power switch pipe is progressively closed off/opened by the modulation of gradual change dutycycle Sofe Switch, makes brush DC electric
Electromechanical levelling cunning is slowly varying, realizes ultra-low noise and EMI.Present embodiment is placed on Sofe Switch control module 40 to control one
Power switch pipe M1 Sofe Switch exemplified by illustrate, the power switch pipe M1 can be driven by Brush-Less DC motor system
In upper bridge arm or lower bridge arm power switch, the power switch pipe M1 can use NOMS, PMOS or other power switch；
The power switch pipe M1 can also be built in Sofe Switch control module 40 in other embodiments.
The Sofe Switch control module 40 includes：One ADJ control units 41, an OSC oscillators 42, a delay unit 43,
One comparator 44, a logic unit 45 and a driver element 46.
The ADJ control units 41 are connected with the delay unit 43 and comparator 44 respectively, for obtain direct current without
The tach signal of brush motor, and inputted according to being inputted after tach signal acquisition speed-regulating signal to the first of the comparator 44
End, at the same according to the speed-regulating signal obtain respectively Sofe Switch downslope time and Sofe Switch current rise time and transmit to
The delay unit 43.
It is specifically as follows：The ADJ control units 41 are coupled to the position sensor 49 of the DC brushless motor, with root
According to the position input signal Pos [n of the position sensor 49:0] the tach signal Speed [m of DC brushless motor are obtained:0],
Wherein n, m are two different variables.The ADJ control units 41 are according to the tach signal, according to corresponding slope by input
The minimum duty cycle voltage that ADJ DC voltages drop in speed adjustable range, afterwards with same slope from minimum duty cycle voltage
The ADJ DC voltages are risen to, and are inputted the slope signal as speed-regulating signal Adj_Ramp to the of the comparator
One input；Meanwhile, obtain the time required to the ADJ DC voltages of input are dropped into minimum duty cycle voltage according to corresponding slope
As Sofe Switch downslope time Phase1, it is straight that acquisition rises to the ADJ according to corresponding slope from minimum duty cycle voltage
Voltage required time is flowed as Sofe Switch current rise time Phase2, and is transmitted to the delay unit 43.It is of the present invention
ADJ control units 41 on the basis of conventional ADJ speed governing, according to different position input signals, with corresponding slope soft
Switch-phases are reduced to the ADJ DC voltages of input the minimum duty cycle voltage VL in speed adjustable range, then with same oblique
Rate returns to the ADJ DC voltages being originally inputted.The slope determines that rotating speed is faster by the tach signal obtained, and slope is bigger, electricity
It is faster that pressure rises or falls speed.
With reference to Fig. 5, the schematic diagram of the embodiment of ADJ control units one of the present invention；As optional embodiment,
The ADJ control units 41 further comprise that a clamper subelement Clamp, charging capacitor C0, electric current leakage Idc1, first compare sub
Unit CMP1, current source Idc2 and the second comparing subunit CMP2.The clamper subelement Clamp passes through one first sub switch
S51 connection charging capacitor C0, for the maximum duty cycle voltage in the ADJ DC voltages clamper to speed adjustable range by input
Vclamp.Electric current leakage Idc1 one end ground connection, the other end is respectively connecting to the sub- list of the first comparison by one second sub switch S52
The positive input of first CMP1 positive input and the second comparing subunit CMP2；First comparing subunit CMP1 negative sense
Minimum duty cycle voltage VL in input termination speed adjustable range, the second comparing subunit CMP2 negative input connects the maximum
Dutycycle voltage Vclamp.Described current source Idc2 one end is connected with external power source VDC, and the other end passes through one the 3rd sub switch
S53 is respectively connecting to the positive input of the first comparing subunit CMP1 positive input and the second comparing subunit CMP2
End.
The mode of realization of Sofe Switch control is：First by the ADJ DC voltage Adj clampers of input to speed adjustable range
Maximum duty cycle voltage Vclamp；Receive after Sofe Switch control commencing signal SoftSwitch, disconnect S51, close S52, lead to
The voltage stored on electric capacity C0 is dropped to minimum duty cycle voltage VL by overcurrent leakage Idc1；CMP1 is triggered, it is soft that electric current declines
The switch phase1 stages terminate.S52 is disconnected, S53 is turned on, is charged with an equal amount of current source Idc2 to electric capacity C0, makes Adj electricity
Pressure rises；After Adj voltages rise to the ADJ DC voltages of initial input, CMP2, the Sofe Switch that ending current rises are triggered
The phase2 stages.Sofe Switch control terminates, and disconnects S52 and S53, S51 is turned on, into normal speed-regulating mode.Wherein current source
Idc2 and electric current leakage Idc1 size of current and direct current brushless motor speed is directly proportional, so that realize that rotating speed is faster, Sofe Switch control
Time processed is shorter.
With continued reference to Fig. 4, the OSC oscillators 42 are connected with the comparator 44, the sawtooth for producing predetermined period
Ripple signal, and input to the second input of the comparator 44.The present invention is produced ADJ control units 41 by comparator 44
A raw level Adj_Ramp is compared the PWM square waves of production different duty with the sawtooth waveforms SAW that OSC oscillators 42 are produced.
As preferred embodiment, the ADJ control units 41 are further connected with the OSC oscillators 42, ADJ controls
Sum is used as Sofe Switch signal the time required to unit 41 processed rises the time required to Sofe Switch electric current is declined with Sofe Switch electric current
SoftSwitch is inputted to the OSC oscillators 42, and the frequency of oscillation of the control OSC oscillators 42 is in the Sofe Switch signal
Accelerate Speed_up in the SoftSwitch times.OSC oscillators 42 are within the SoftSwitch times, and frequency of oscillation accelerates, can be with
More square-wave pulses are produced within the commutation time so that have the more multicycle in the Sofe Switch stage, dutycycle fade effect is more
Substantially.
The delay unit 43 is connected with the logic unit 45, for the switch control for the power switch pipe M1 that will be got
The be delayed Sofe Switch downslope time or inputted after Sofe Switch current rise time to described of logical signal Gate_ON processed is patrolled
Collect unit 45.That is, the phase phase1 that is controlled respectively as Sofe Switch of the time of ADJ DC voltage raising and lowerings and phase
Phase2 signals are transferred to delay unit 43.Gate_ON signals are delayed by delay unit 43 when Sofe Switch electric current declines
The phase1 times, Gate_ON signals are delayed the phase2 times when Sofe Switch electric current rises, switched for doing Sofe Switch
Journey.It is specifically as follows：The delay unit 43 is coupled to the position sensor 49 of the DC brushless motor, with according to institute's rheme
Put the position input signal Pos [n of sensor 49:0] power switch pipe M1 switch control logic signal Gate_ON is obtained.
The comparator 44 is connected with the logic unit 45, for comparing the speed-regulating signal Adj_Ramp and sawtooth waveforms
Signal SAW produces the adjustable PWM waveform of dutycycle, and inputs to the logic unit 45, for modulation driver element 46.
The logic unit 45 is connected with driver element 46, for the output according to the delay unit 43 and comparator 44
Modulate the driver element 46.Namely exported the time delayed signal of delay unit 43 and comparator 44 gradually by logic unit 45
Become PWM square waves and carry out logical operation, modulate the driver element 46；So that in phase1 time internal power switching tubes M1 disconnection
Signal is gradually turned off by gradual change PWM modulation, phase2 time internal power switching tubes M1 Continuity signal by gradual change PWM
Modulation be gradually turned on, so as to realize Sofe Switch handoff procedure.The logic unit 45 is logical AND gate in the present embodiment,
In other embodiments or logic sum gate, or other logical operation components.
The driver element 46 is connected with the power switch pipe M1, for controlling the soft of power switch pipe M1 to open
Close.Namely the driver element 46 is according to the output driving power switch pipe M1 of logic unit 45, in phase1 time internal powers
Switching tube M1 cut-off signal is gradually turned off by gradual change PWM modulation, in phase2 time internal power switching tubes M1 conducting
Signal is gradually turned on by gradual change PWM modulation.
As optional embodiment, the Sofe Switch control module 40 further comprises a timer 47；The timing
Device 47 is connected with the OSC oscillators 42 and ADJ control units 41 respectively.OSC oscillators 42 produce the square wave of some cycles
It is used as the clock of timer 42；Timer 47 receives the position input signal of the position sensor 49 of the DC brushless motor
Pos[n:0], and after position input signal is received, calculated according to the clock signal clk that the OSC oscillators 42 are provided
The rotating speed of DC brushless motor, and by the tach signal Speed [m calculated:0] input to the ADJ control units 41.Timing
Device 47 can be by tach signal Speed [m:0] ADJ control units 41 are input to 2 binary signals.
As optional embodiment, the Sofe Switch control module 40 further comprises a decoder 48；The decoding
Device 48 is connected with the delay unit 43, the position input signal of the position sensor 49 for receiving the DC brushless motor
Pos[n:0], and by the position input signal received decoded, obtain power switch pipe M1 switch control logic signal
Gate_ON is inputted to the delay unit 43.
The embodiment of driven by Brush-Less DC motor system one of the present invention is provided below in conjunction with accompanying drawing, to be done to the present invention
Further illustrate.
With reference to Fig. 6-Fig. 7, wherein, Fig. 6 is that the embodiment of driven by Brush-Less DC motor system one of the present invention switch is changed
Current diagram during phase；Fig. 7 is the work wave schematic diagram of each node of embodiment described in Fig. 6.Direct current of the present invention without
Brush motor drive system realizes gradual change dutycycle Sofe Switch mode.The switching sequence of which is：S1, S4 be both turned on → and S1 leads
Logical, S4 is gradually turned off (duration phase1) → S1 disconnections, S4 disconnections → S3 conductings, and S2 is gradually turned on the (duration
Phase2) → S2, S3 is both turned on.With reference to Fig. 6 in the phase1 times, S4 is by the slow disconnection of square wave control of gradual change dutycycle
(Soft OFF)；From S4 GND is flowed in the S4 time currents turned on, parasitic diode stream of the time current through S3 disconnected in S4
To bus；Inductance both end voltage difference gradually decreases to-Vdio, the slow smooth decline of electric current by Vbus.Similarly, in phase2
Between, electric current is from zero slow smooth rising (Soft ON)；So that current non-linear is slowly varying, waveform is more smooth, realizes
Ultra-low noise and EMI.Meanwhile, phase1 the and phase2 times change with motor speed, and rotating speed is faster, and the phase times are shorter, from
And avoid efficiency decline.And, within the SoftSwitch times, the frequency of oscillation for producing SAW ripples accelerates, can be in the commutation time
It is interior to produce more PWM square-wave pulses so as to have the more multicycle in the Sofe Switch stage, dutycycle fade effect is more obvious.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (8)
1. a kind of Sofe Switch control module, it is adaptable to driven by Brush-Less DC motor system, the driven by Brush-Less DC motor system
Including DC brushless motor and an at least power switch pipe, it is characterised in that including：One control unit, an oscillator, one prolong
Shi Danyuan, a comparator, a logic unit and a driver element；
Described control unit is connected with the delay unit and comparator respectively, and the rotating speed for obtaining DC brushless motor is believed
Number, and according to being inputted after tach signal acquisition speed-regulating signal to the first input end of the comparator, while according to described
Speed-regulating signal obtains Sofe Switch downslope time and Sofe Switch current rise time and transmitted to the delay unit respectively；
The oscillator is connected with the comparator, the sawtooth signal for producing predetermined period, and inputs to the comparison
Second input of device；
The delay unit is connected with the logic unit, the switch control for an at least power switch pipe described in getting
The logical signal delay processed Sofe Switch downslope time is inputted after Sofe Switch current rise time to the logic unit；
The comparator is connected with the logic unit, can for comparing the speed-regulating signal and sawtooth signal generation dutycycle
The PWM waveform of tune, and input to the logic unit；
The logic unit is connected with driver element, for modulating the driving according to the output of the delay unit and comparator
Unit；
The driver element is connected with an at least power switch pipe, for controlling at least the soft of a power switch pipe to open
Close.
2. Sofe Switch control module according to claim 1, it is characterised in that described control unit is believed according to the rotating speed
Number, the minimum duty cycle voltage for dropping to the DC voltage of input in speed adjustable range according to corresponding slope, afterwards with same
Slope rises to the DC voltage from minimum duty cycle voltage, and is inputted the slope as speed-regulating signal to the comparator
First input end；Meanwhile, the DC voltage of input is dropped to minimum duty cycle voltage according to corresponding slope and taken by acquisition
Between as Sofe Switch downslope time, obtain according to corresponding slope and to rise to the DC voltage institute from minimum duty cycle voltage
Take time as Sofe Switch current rise time, and transmit to the delay unit.
3. Sofe Switch control module according to claim 1, it is characterised in that described control unit further comprises a pincers
Seat unit, charging capacitor, electric current leakage, the first comparing subunit, current source and the second comparing subunit；
The clamper subelement connects charging capacitor by one first sub switch, for by the DC voltage clamper of input to speed governing
In the range of maximum duty cycle voltage；
The electric current leaks one end ground connection, and the other end is respectively connecting to the positive defeated of the first comparing subunit by one second sub switch
Enter the positive input of end and the second comparing subunit, the negative input of the first comparing subunit is connect in speed adjustable range most
Small dutycycle voltage, the negative input of the second comparing subunit connects the maximum duty cycle voltage；
The current source is respectively connecting to the positive input and the second ratio of the first comparing subunit by one the 3rd sub switch
Compared with the positive input of subelement；
After Sofe Switch control starts, the first sub switch, the second sub switch of closure are disconnected, will be deposited by electric current leakage on charging capacitor
The voltage of storage, which drops to, triggers the first comparing subunit after minimum duty cycle voltage；The second sub switch, closure the 3rd are disconnected afterwards
Sub switch, is that charging capacitor charging makes voltage rise to the sub- list of the comparison of triggering second after maximum duty cycle voltage by current source
Member；After Sofe Switch control terminates, the second sub switch and the 3rd sub switch are disconnected, the first sub switch is closed；
Wherein, electric current leakage is equal with the size of current of current source and is directly proportional to direct current brushless motor speed.
4. Sofe Switch control module according to claim 1, it is characterised in that described control unit is further shaken with described
Swing device to be connected, sum is opened as soft the time required to control unit rises the time required to Sofe Switch electric current is declined with Sofe Switch electric current
OFF signal is inputted controls the frequency of oscillation of the oscillator to accelerate in the Sofe Switch signal time to the oscillator.
5. Sofe Switch control module according to claim 1, it is characterised in that the Sofe Switch control module is further wrapped
Include a timer；
The timer is connected with the oscillator and control unit respectively, for receiving after the input signal of position, according to
The clock signal that the oscillator is provided calculates the rotating speed of DC brushless motor, and the tach signal calculated is inputted to institute
State control unit.
6. Sofe Switch control module according to claim 1, it is characterised in that the Sofe Switch control module is further wrapped
Include a decoder；
The decoder is connected with the delay unit, for being decoded after receiving position input signal, obtains power and opens
The switch control logic signal for closing pipe is inputted to the delay unit.
7. a kind of driven by Brush-Less DC motor system, including a DC brushless motor and an at least power switch pipe, it is described extremely
A few power switch pipe is electrically connected the DC brushless motor, is changed by an at least power switch pipe described in control described
The DC brushless motor sense of current, it is characterised in that it is any one that the driven by Brush-Less DC motor system includes claim 1-6
Sofe Switch control module described in；
Described control unit in the Sofe Switch control module is coupled to the position sensor of the DC brushless motor, with root
The tach signal of DC brushless motor is obtained according to the position input signal of the position sensor；
The delay unit in the Sofe Switch control module is coupled to the position sensor of the DC brushless motor, with root
According to the switch control logic signal of an at least power switch pipe described in the position input signal acquisition of the position sensor；
The driver element in the Sofe Switch control module is electrically connected an at least power switch pipe, described to control
At least Sofe Switch of a power switch pipe.
8. driven by Brush-Less DC motor system according to claim 7, it is characterised in that an at least power switch pipe
It is built in the Sofe Switch control module.
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| CN108400739B (en) * | 2018-05-02 | 2024-02-02 | 上海灿瑞科技股份有限公司 | Self-adaptive low-noise soft switching circuit of single-phase motor |
| CN110289800A (en) * | 2019-06-27 | 2019-09-27 | 上海勤进半导体有限公司 | A kind of control method and system reducing electromagnetic sound |
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| US7423894B2 (en) * | 2006-03-03 | 2008-09-09 | Advanced Energy Industries, Inc. | Interleaved soft switching bridge power converter |
| JP5586312B2 (en) * | 2010-04-22 | 2014-09-10 | セミコンダクター・コンポーネンツ・インダストリーズ・リミテッド・ライアビリティ・カンパニー | Motor drive circuit |
| JP5726572B2 (en) * | 2011-02-28 | 2015-06-03 | ミネベア株式会社 | Motor drive circuit |
| KR101250625B1 (en) * | 2011-10-25 | 2013-04-09 | 삼성전기주식회사 | Driving apparatus for motor |
| JP6081734B2 (en) * | 2012-08-13 | 2017-02-15 | ラピスセミコンダクタ株式会社 | Semiconductor device, electronic device, and control signal generation method |
| CN204633649U (en) * | 2015-05-11 | 2015-09-09 | 上海晶丰明源半导体有限公司 | Sofe Switch control module and driven by Brush-Less DC motor system |
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