CN105006986B - A kind of Sofe Switch control system of DC brushless motor - Google Patents
A kind of Sofe Switch control system of DC brushless motor Download PDFInfo
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- CN105006986B CN105006986B CN201510413375.5A CN201510413375A CN105006986B CN 105006986 B CN105006986 B CN 105006986B CN 201510413375 A CN201510413375 A CN 201510413375A CN 105006986 B CN105006986 B CN 105006986B
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- 230000006698 induction Effects 0.000 claims abstract description 31
- 230000010363 phase shift Effects 0.000 claims abstract description 15
- 230000002459 sustained effect Effects 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 10
- 239000004065 semiconductor Substances 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000001727 in vivo Methods 0.000 claims description 2
- 239000010409 thin film Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 238000003079 width control Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
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- 210000001367 artery Anatomy 0.000 description 1
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- 238000007600 charging Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention belongs to the Sofe Switch control system in the translation circuit field of Switching Power Supply, more particularly to a kind of DC brushless motor.The Sofe Switch control system includes dc source, auxiliary switch, fly-wheel diode, LC series circuits, auxiliary induction, phase-shift pulse generator and three phase inverter bridge；Phase-shift pulse generator exports the break-make of the first control pulse and the second modulation Pulse Width Control auxiliary switch and inverter bridge respectively, and the first control pulse is identical with the frequency and dutycycle that second modulates pulse, the former advanced preset time of the latter one only in phase.The one in front and one in back two group pulse signal exported according to this phase-shift pulse generator, the Sofe Switch function of auxiliary switch and three phase inverter bridge can be realized, the ability on or off when the voltage or electric current at all switching tube two ends are zero, reduce switch handoff loss, noise jamming is reduced, Switching Condition is improved, inverter bridge fault rate can be effectively reduced, the performance of inverter is improved, circuit functional reliability is improved.
Description
Technical field
The invention belongs to the Sofe Switch control in the translation circuit field of Switching Power Supply, more particularly to a kind of DC brushless motor
System.
Background technology
In recent years, DC brushless motor obtains fast development with its superior performance, however, DC brushless motor is usual
Driven using hard switching inverter.The inverter of DC brushless motor is a HF switch, there is many drawbacks.For example,
When hard switching inverter is opened, the electric current of switching device rises and voltage declines progress simultaneously；When hard switching inverter is turned off, electricity
Pressure rises and electric current declines progress simultaneously.Therefore, the overlapping of voltage and current waveform generates switching loss, and the loss is with switch
The raising of frequency and rapidly increase.On the other hand, DC brushless motor and distributed inductance can induce peak voltage when off,
Switching frequency is higher, and shut-off is faster, and the induced voltage is also higher, and di/dt and dv/dt also increase simultaneously, can produce serious electricity
Magnetic disturbance.High-frequency operation causes electromagnetic interference to increase, the work of interference inverter and ambient electronics.Therefore, using hard
The inverter system performance of switch is low, the voltage and current stress of switching device also seriously limit inverter power density and
High-power applications.
The content of the invention
In view of this, the purpose of the present invention is the Sofe Switch control system for being to provide a kind of DC brushless motor, is realized
Sofe Switch is controlled, and the switching loss and noise jamming of switching device is reduced, so as to improve the performance of inverter.
To achieve these goals, the Sofe Switch control system for the DC brushless motor that the present invention is provided, including：Direct current
Source, auxiliary switch K7, sustained diode 1, LC series circuits, auxiliary induction L1, phase-shift pulse generator and pass through three poles
The three phase inverter bridge that point is connected with the DC brushless motor；
The auxiliary switch K7 and the auxiliary induction L1 are sequentially connected in series in the output end of the dc source and described three
In phase inversion bridge loop, the negative electrode of the sustained diode 1 connects connecing altogether for the auxiliary switch K7 and auxiliary induction L1
Point, the anode of the sustained diode 1 connects the ground of the dc source, and the LC series circuits are connected to the auxiliary switch
Between the ground of K7 and the auxiliary induction L1 common contact and the dc source；On the one hand the phase-shift pulse generator passes through
Output first controls pulse to control the break-make of the auxiliary switch K7, on the other hand modulates pulse to control by output second
The break-make of any bridge arm of three phase inverter bridge；Also, it is described first control pulse with described second modulation pulse frequency and
Dutycycle is identical, the first control pulse advanced second modulation preset time t 1 of pulse one in phase.
The Sofe Switch control system for the DC brushless motor that the present invention is provided, phase-shift pulse generator output first controls arteries and veins
Punching control auxiliary switch K7 break-make, output second modulates pulse to control the break-make of any bridge arm of three phase inverter bridge；Also, the
One control pulse is identical with frequency and dutycycle that second modulates pulse, the former advanced preset time of the latter one only in phase
t1.The one in front and one in back two group pulse signal exported according to this phase-shift pulse generator, can realize auxiliary switch K7 and three contraries
Become the Sofe Switch function of bridge, the ability on or off when the voltage or electric current at all switching tube two ends are zero reduces switch switching
Loss, reduces noise jamming, Switching Condition is improved, and can effectively reduce inverter bridge fault rate, improves the property of inverter
Can, improve circuit functional reliability.
Brief description of the drawings
Fig. 1 is the structural representation of the Sofe Switch control system of DC brushless motor provided in an embodiment of the present invention；
Fig. 2 is the work schedule exemplary plot of the Sofe Switch control system of DC brushless motor provided in an embodiment of the present invention；
Fig. 3 is the Current Voltage change oscillogram on each switching tube corresponding with Fig. 2.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 is the structural representation of the Sofe Switch control system of DC brushless motor provided in an embodiment of the present invention；In order to
It is easy to explanation, illustrate only part related to the present embodiment, as shown in the figure：
A kind of Sofe Switch control system of DC brushless motor, is connected with DC brushless motor, including：It is dc source, auxiliary
Help switch K7, sustained diode 1, LC series circuits, auxiliary induction L1, phase-shift pulse generator 10 and by three limits
The three phase inverter bridge being connected with the DC brushless motor.
Specifically, auxiliary switch K7 and auxiliary induction L1 are sequentially connected in series output end and three phase inverter bridge in dc source
In loop, sustained diode 1 is attempted by between auxiliary switch K7 rear end and dc source ground, i.e. the moon of sustained diode 1
Pole connects auxiliary switch K7 and auxiliary induction L1 common contact, and anode is with connecing dc source；One termination auxiliary of LC series circuits is opened
Pass K7 and auxiliary induction L1 common contact, another termination dc source.Phase-shift pulse generator 10 exports two pulse signals,
On the one hand control pulse Dt+ to control auxiliary switch K7 break-make by output first, on the other hand modulated by output second
Pulse Dt controls the break-make of any bridge arm switching tube K1-K6 in three phase inverter bridge；Also, the first control pulse Dt+ and second
The frequency for modulating pulse Dt is identical with dutycycle, and the first control pulse Dt+ advanced second modulation pulse Dt mono- in phase are pre-
If time t1.
As a preferred embodiment, according to the parameter configuration of each component in control system, the preset time t 1 can be set
0.5~2 microsecond is set to, i.e., first controls pulse Dt+ advanced second modulation pulse Dt in phase to be 0.5~2 microsecond.According to figure
The schematic diagram of the first control pulse Dt+ and the second modulation pulse Dt shown in 1, when the first control pulse Dt+ positive driving pulse
In 0.5~2 gsec for opening auxiliary switch K7, dc source is through auxiliary switch K7, LC series circuit to power supply, to electricity
Hold C1 chargings, because having inductance L2 series connection in circuit, electric current can only be from zero slow rising；Now, dc source, auxiliary induction
L1, three phase inverter bridge to dc source ground this loop it is auxiliary because three phase inverter bridge is also not turned on without electric current
It is that Zero-current soft is open-minded to help switch K7；Auxiliary switch K7 is opened completely after 0.5~2 microsecond, and three phase inverter bridge is in the second modulation
Any bridge arm is opened under pulse Dt driving to be powered to a motor wherein phase winding, because inductance L2 is connected in the loop, electricity
Stream also can only be from zero slow rising, so three phase inverter bridge is also that Zero-current soft is open-minded.Next step, in auxiliary switch K7 and inverse
Become bridge to open in the phase, electric capacity C1 has been filled with electricity, the voltage at electric capacity C1 two ends is equal to the electricity of supply voltage, i.e. auxiliary switch K7 two ends
Pressure is equal.Auxiliary switch K7 is closed, because the voltage at electric capacity C1 two ends can not be mutated, is able to maintain that when auxiliary switch K7 is turned off
Voltage, so auxiliary switch K7 is Zero-voltage soft shut-off；After auxiliary switch K7 shut-offs, because auxiliary induction L1 electric current can not dash forward
Become, sustained diode 1 carries out afterflow, auxiliary induction L1 energy discharges through inverter bridge to electric motor loop；At the same time, electric capacity
C1 energy discharges through inductance L2, auxiliary induction L1 and inverter bridge to electric motor loop.After 0.5~2 microsecond, inductance L1, electric capacity C1
Energy release complete, now inverter bridge no-voltage and electric current, the bridge arm that inverter bridge is powered also realizes no-voltage and zero current
Soft switching.
It follows that the Sofe Switch control system of DC brushless motor provided in an embodiment of the present invention, in all switching tubes
Ability on or off when the voltage or electric current at two ends are zero, reduces switch handoff loss, reduces noise jamming, make switch bar conscientiously
Part is improved, and can effectively reduce inverter bridge fault rate, improves the performance of inverter, improves circuit functional reliability.
Need especially, it is emphasized that first controls pulse Dt+ advanced second modulation pulse Dt in phase to be 0.5~2 micro-
Second is realized according to the parameter configuration of each component, and in specific implementation process, the phase difference of two pulse signals can root
Configured according to actual conditions.Also, producing the prototype of the phase-shift pulse generator of the two pulse signals can be compiled by software
Journey is produced, such as is realized in single-chip microcomputer or DSP, can also be produced, for example, be driven by amplifying circuit by hardware circuit
Break-make control for each switching tube in auxiliary switch K6 in the system and three phase inverter bridge afterwards.
In specific implementation process, the dc source that dc source can be formed for electric main after rectified can also
For by some battery strings and the battery pack that is formed together.
Specifically, LC series circuits can include inductance L2 and electric capacity C1.With continued reference to Fig. 1, inductance L2 the first termination
Auxiliary switch K7 and auxiliary induction L1 common contact, inductance L2 the second end by electric capacity C1 with connecing dc source.In fact, should
The position of inductance L2 and electric capacity C1 in LC series circuits can also be exchanged, i.e. the first of electric capacity C1 terminates auxiliary switch K7 and auxiliary
Help inductance L1 common contact, electric capacity C1 the second end by inductance L2 with connecing dc source.
Further, auxiliary induction L1 can select the inductance with magnetic core or hollow inductance.And in LC series circuits
Inductance L2 selection is typically identical with auxiliary induction L1, and simply its overcurrent is small compared with auxiliary induction L1.Electric capacity C1 is typically selected
Thin-film capacitor is preferred.Auxiliary switch K7 is typically from the metal-oxide-semiconductor or IGBT for carrying diode in vivo.And in three phase inverter bridge
Six switching tubes can similarly select metal-oxide-semiconductor or IGBT；Include a power in each switching tube in inverter bridge respectively
The fly-wheel diode of switch and a reverse parallel connection.Fig. 1 is only schematic diagram, the not complete concrete structure for embodying switching tube.
Below further according to phase-shift pulses of the Fig. 2 to DC brushless motor Sofe Switch control system provided in an embodiment of the present invention
The operation principle of control is briefly described.For convenience, one of control of three phase inverter bridge AC phases is only chosen here
The working condition in cycle processed illustrates, also, first controls pulse Dt+ to be still that advanced second modulation pulse Dt is in phase
0.5~2 microsecond.Referring to Fig. 2：
1.T1 moment, the first control pulse Dt+ control auxiliary switch K7 is opened, what the switching tube of inverter bridge was all off.
Current loop is：Dc source just --- --- bear auxiliary switch K7 by inductance L2 --- electric capacity C1 --- dc source.This loop
In because be in series with inductance L2, start from scratch rising to the electric capacity C2 electric currents charged by auxiliary switch K7, therefore, now aid in
It is that Zero-current soft is opened to switch K7.
2. by T1~T2 time (microsecond of duration 0.5~2), at the T2 moment, the second modulation pulse Dt opens inverter bridge
AC phases.Current loop is：Dc source just --- auxiliary switch K7 --- auxiliary induction L1 --- switching tube K1 --- motors
Winding --- switching tube K6 --- dc source is born.Because being in series with auxiliary induction L1, DC brushless motor winding in this loop
Electric current be also rising of starting from scratch, now switching tube K1, K6 Zero-current soft in inverter bridge is open-minded.
3. by T2~T3 time, the T3 moment is arrived, auxiliary switch K7 shut-offs.Because now electric capacity C1 two ends have been filled
Full electricity, the voltage at auxiliary switch K7 two ends is equal, even if auxiliary switch K7 is turned off, but because the voltage at electric capacity C1 two ends can not dash forward
Become, therefore auxiliary switch K7 is Zero-voltage soft shut-off.
4. during T3~T4 moment, auxiliary switch K7 has been turned off, auxiliary induction L1 electric current can not be mutated.Current loop
It is changed into：Sustained diode 1+ --- auxiliary induction L1 --- switching tube K1 --- machine winding --- switching tube K6 --- direct currents
Power supply is born --- the sustained diode 1- (microseconds of afterflow duration 0.5~2, it has to be noted here that phase of the afterflow duration with two-way pulse
The potential difference time is equal)；At the same time, electric capacity C1 is discharged, and loop is：Electric capacity C1+ --- inductance L2 --- auxiliary induction
L1 --- switching tube K1 --- machine winding --- switching tube K6 --- electric capacity C1-.At T4 moment, inductance L1 afterflows, electric capacity C1
Electric discharge is completed.
The 5.T4 moment, because auxiliary induction L1 afterflows and electric capacity C1 electric discharges have been completed, no current and voltage, three in loop
Switching tube K1 and/or switching tube K6 in phase inverter bridge are closed, and now converter bridge switching parts pipe K1 and/or switching tube K6 are also zero electricity
Stream, Zero-voltage soft are closed.
Above procedure completes a modulation work period, when DC brushless motor commutation, auxiliary switch K7 control letter
Number first control pulse Dt+ also changes the corresponding pulses of another phase modulation into simultaneously.
Fig. 3 further illustrates flow through in auxiliary switch K7, inverter bridge corresponding with Fig. 2 phase-shift pulse waveform and switched
Pipe K1 and K6 electric current and the oscillogram of voltage.
Referring to Fig. 3, top half is the current-voltage waveform figure on auxiliary switch K7；Where the dotted line signifies that is voltage wave
Shape, what solid line was represented is current waveform.The latter half is the current-voltage waveform on switching tube K1 and K6 in inverter bridge, equally
, what dotted line was represented is voltage waveform, and what solid line was represented is current waveform.
From the figure 3, it may be seen that whether switching tube K1 and K6 in auxiliary switch K7 or inverter bridge, their voltage waveform and electricity
Waveform is flowed without part that is overlapping, overlapping, that is, electric current is zero when having voltage, voltage is zero again when have electric current, because
This, in whole switching process, each switching tube does not all produce loss, and switch handoff loss is reduced conscientiously, reduces noise
Interference, makes Switching Condition be improved, further reduction inverter bridge fault rate, improves the performance of inverter, improves circuit work
Make reliability.
It is worth noting that, in above-described embodiment, included unit is simply divided according to function logic,
But above-mentioned division is not limited to, as long as corresponding function can be realized；In addition, the specific name of each functional unit
Only to facilitate mutually distinguishing, the protection domain being not intended to limit the invention.
In addition, one of ordinary skill in the art will appreciate that realizing all or part of step in the various embodiments described above method
It can be by program to instruct the hardware of correlation to complete, corresponding program can be stored in embodied on computer readable storage Jie
In matter, described storage medium, such as ROM/RAM, disk or CD.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, although with reference to foregoing reality
Apply example the present invention has been carried out relatively to be described in detail, for those skilled in the art, it still can be to foregoing each reality
The technical scheme described in example is applied to modify or carry out equivalent substitution to which part technical characteristic.It is all the present invention
Any modifications, equivalent substitutions and improvements made within spirit and principle etc., should be included in the scope of the protection.
Claims (9)
1. the Sofe Switch control system of a kind of DC brushless motor, it is characterised in that the Sofe Switch control system includes：Direct current
Power supply, auxiliary switch K7, sustained diode 1, LC series circuits, auxiliary induction L1, phase-shift pulse generator and pass through three
The three phase inverter bridge that limit is connected with the DC brushless motor；
The auxiliary switch K7 and the auxiliary induction L1 are sequentially connected in series output end and three contrary in the dc source
Become in bridge loop, the negative electrode of the sustained diode 1 connects the auxiliary switch K7 and the auxiliary induction L1 common contact, institute
State the anode of sustained diode 1 with connecing the dc source, the LC series circuits are connected to the auxiliary switch K7 and described
Between auxiliary induction L1 common contact and the dc source ground；On the one hand the phase-shift pulse generator is controlled by output first
Pulse processed controls the break-make of the auxiliary switch K7, on the other hand modulates pulse to control three contrary by output second
Become the break-make of any bridge arm of bridge；Also, the first control pulse is identical with the frequency and dutycycle of the described second modulation pulse,
The first control pulse advanced second modulation preset time t 1 of pulse one in phase.
2. the Sofe Switch control system of DC brushless motor as claimed in claim 1, it is characterised in that the LC series circuits
Including inductance L2 and electric capacity C1；
The the first termination auxiliary switch K7 and auxiliary induction L1 of the inductance L2 common contact, the of the inductance L2
Two ends by the electric capacity C1 with connecing the dc source.
3. the Sofe Switch control system of DC brushless motor as claimed in claim 1, it is characterised in that the LC series circuits
Including inductance L2 and electric capacity C1；
The the first termination auxiliary switch K7 and auxiliary induction L1 of the electric capacity C1 common contact, the of the electric capacity C1
Two ends by the inductance L2 with connecing the dc source.
4. the Sofe Switch control system of DC brushless motor as claimed in claim 2 or claim 3, it is characterised in that the auxiliary electricity
It is the inductance with magnetic core or hollow inductance to feel L1.
5. the Sofe Switch control system of DC brushless motor as claimed in claim 4, it is characterised in that the choosing of the inductance L2
Material is identical with the auxiliary induction L1, and overcurrent is small compared with the auxiliary induction L1；The electric capacity C1 is thin-film capacitor.
6. the Sofe Switch control system of DC brushless motor as claimed in claim 1, it is characterised in that the auxiliary switch K7
To carry the metal-oxide-semiconductor or IGBT of diode in vivo.
7. the Sofe Switch control system of DC brushless motor as claimed in claim 1, it is characterised in that the phase-shift pulse hair
Raw device includes single-chip microcomputer or DSP.
8. the Sofe Switch control system of DC brushless motor as claimed in claim 1, it is characterised in that the dc source is
Dc source after electric main rectification is battery strings and the battery pack that is formed together.
9. the Sofe Switch control system of DC brushless motor as claimed in claim 1, it is characterised in that the three phase inverter bridge
In six switching tubes be metal-oxide-semiconductor or IGBT；It is reverse simultaneously including a power switch and one respectively in each switching tube
The fly-wheel diode of connection.
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| CN201510413375.5A CN105006986B (en) | 2015-07-14 | 2015-07-14 | A kind of Sofe Switch control system of DC brushless motor |
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| CN201510413375.5A CN105006986B (en) | 2015-07-14 | 2015-07-14 | A kind of Sofe Switch control system of DC brushless motor |
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| CN105006986B true CN105006986B (en) | 2017-10-10 |
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| CN106452213A (en) * | 2016-08-23 | 2017-02-22 | 顺丰科技有限公司 | Electronic speed regulator and control method |
| CN106647488A (en) * | 2016-12-18 | 2017-05-10 | 四川超影科技有限公司 | Power switch control circuit applied to patrol robot |
| CN112701896A (en) * | 2020-12-03 | 2021-04-23 | 佛山科学技术学院 | Lossless absorption soft switching circuit based on Buck |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5774351A (en) * | 1996-05-21 | 1998-06-30 | National Science Council | Series resonant DC-to-AC inverter system |
| CN101951186A (en) * | 2010-09-27 | 2011-01-19 | 浙江大学 | Soft switching three-phase gird-connected inverter additionally provided with freewheeling path |
| GB2499991A (en) * | 2012-03-05 | 2013-09-11 | Solaredge Technologies Ltd | DC link circuit for photovoltaic array |
| CN102638221A (en) * | 2012-04-26 | 2012-08-15 | 南京航空航天大学 | Front end buck convertor lossless buffer circuit for controlling superpower high-speed motor |
| CN204794751U (en) * | 2015-07-14 | 2015-11-18 | 广东高标电子科技有限公司 | DC Brushless motor's soft switch control system |
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Address after: No. 3 Gongye West Road, Songshan Lake Park, Dongguan City, Guangdong Province, 523000 Patentee after: Guangdong Gaobiao Intelligent Technology Co.,Ltd. Address before: No.3, Gongye West Road, Songshanhu high tech Industrial Development Zone, Dongguan City, Guangdong Province Patentee before: SHENZHEN GOBAO ELECTRONIC TECHNOLOGY Co.,Ltd. |