CN106130323B - A kind of control method of power supply, apparatus and system - Google Patents
A kind of control method of power supply, apparatus and system Download PDFInfo
- Publication number
- CN106130323B CN106130323B CN201610493814.2A CN201610493814A CN106130323B CN 106130323 B CN106130323 B CN 106130323B CN 201610493814 A CN201610493814 A CN 201610493814A CN 106130323 B CN106130323 B CN 106130323B
- Authority
- CN
- China
- Prior art keywords
- power supply
- frequency
- supply unit
- square wave
- output voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
Invention provides control method, the apparatus and system of a kind of power supply, belongs to field of power electronics.When to power supply control, for each power supply unit that power supply includes, the frequency and amplitude of modulated square wave are respectively set according to the frequency of power supply unit pre-set output voltage and amplitude；And the frequency of the set of frequency triangular carrier according to modulated square wave；Parameter after setting according to setting generates and exports triangular carrier and modulated square wave is modulated to obtain the driving signal of each switching tube in power supply unit, and the output voltage of the power supply unit can be obtained according to each switching tube in obtained driving signal control power supply unit.Namely the embodiment of the present invention is realized and is controlled by square-wave frequency modulation power supply, can promote DC bus utilization rate.
Description
Technical field
The present invention relates to field of power electronics more particularly to a kind of control methods of power supply, apparatus and system.
Background technique
High voltagehigh frequency AC power source, such as ozone generator are needed in many applications.By adjusting the frequency of power supply,
So that entire circuit generates resonance, i.e., purely resistive is presented in circuit at this time, and power factor is high.It commonly reaches resonance and needs several KHz's
Power frequency supply.By the control mode of cross-straight-intersection, power frequency supply is rectified into direct current, voltage is then reverse into and frequency is adjustable
Alternating current.Existing conventional implementation be using PWM modulation, output frequency and the adjustable alternating current of amplitude, and it is current
Modulator approach divides SPWM (Sinusoidal Pulse Width Modulation, sinusoidal pulse width modulation) and SVM (Space
Vector Modulation, space vector modulation).Asymmetric rule are carried out by modulating wave and carrier wave for SPWM modulator approach
Then sample, calculate each switch periods switch open and the turn-off time, by controlling the frequency and amplitude of modulating wave, and then produce
The AC power source of sine wave of raw three-phase symmetrical, in SPWM modulator approach, the frequency of carrier wave often needs to select much larger than modulating wave
Frequency, with guarantee both have enough intersection points in modulated process.And SVM then mainly passes through the modulation methods of space vector
Method generates the AC power source of sine wave of three-phase symmetrical by controlling the amplitude and frequency of rotational voltage vector.
The present invention proposes a kind of new PWM method different from above two modulator approach.
Summary of the invention
The present invention provides a kind of control method of power supply, apparatus and system, mainly solving the technical problems that；Power supply is mentioned
For a kind of new PWM method.
According in a first aspect, providing a kind of control method of power supply in a kind of embodiment, the power supply includes at least one
Power supply unit；The described method includes:
For each power supply unit, it is respectively set according to the frequency of the power supply unit pre-set output voltage and amplitude
The frequency and amplitude of modulated square wave；
According to the frequency of the set of frequency triangular carrier of the modulated square wave；
It generates and exports the triangular carrier and the modulated square wave is modulated, obtain respectively switching in the power supply unit
The driving signal of pipe；
Each switching tube in the power supply unit is controlled according to the driving signal, obtains the output electricity of the power supply unit
Pressure.
Further, the frequency packet of the modulated square wave according to the set of frequency of the power supply unit pre-set output voltage
It includes:
It is equal with the frequency of the power supply unit pre-set output voltage by the set of frequency of the modulated square wave.
Further, include: according to the frequency of the set of frequency triangular carrier of the modulated square wave
When the frequency of the power supply unit pre-set output voltage is greater than default high frequency threshold value, by the frequency of the triangular carrier
Rate is set as equal with the frequency of the modulated square wave.
Further, the power supply includes at least two power supply units being sequentially connected in series.
Further, further includes: further include by described three before the output triangular carrier and the modulated square wave
The phase shift predetermined angle α of the triangular carrier of the relatively upper power supply unit of the phase of angle carrier wave.
Further, it exports the triangular carrier and modulated square wave is modulated and includes:
The triangular carrier and the modulated square wave are exported simultaneously；
The polarity of the modulated square wave is updated in each minimum point of triangular carrier and highest point；
According to the corresponding driving signal for generating each switching tube of the intersection point of the triangular carrier and the modulated square wave.
According to second aspect, a kind of control device of power supply is provided in a kind of embodiment, which is characterized in that the power supply packet
Include at least one power supply unit；The control device includes controller and signal processor；
The signal processor is used to be directed to each power supply unit, according to the frequency of the power supply unit pre-set output voltage
The frequency and amplitude of modulated square wave, and the frequency of the set of frequency triangular carrier according to the modulated square wave is respectively set in rate and amplitude
Rate, and be modulated for generating and exporting the triangular carrier and the modulated square wave, it exports each in the power supply unit
The driving signal of switching tube；
The controller is used to the driving signal inputting the power supply unit, controls respectively opening in the power supply unit
Close the output voltage for being in control the power supply unit.
Further, the signal processor is used to the set of frequency of the modulated square wave be pre- with the power supply unit
If the frequency of output voltage is equal.
Further, the signal processor is used to be greater than default height in the frequency of the power supply unit pre-set output voltage
It is equal with the frequency of the modulated square wave by the set of frequency of the triangular carrier when frequency threshold value.
Further, the power supply includes at least two power supply units being sequentially connected in series, and the signal processor is also
For before exporting the triangular carrier and the modulated square wave, by the relatively upper power supply unit of the phase of the triangular carrier
The phase shift predetermined angle α of triangular carrier.
According to the third aspect, a kind of power-supply system, including power supply and control dress as described above are provided in a kind of embodiment
It sets；The power supply includes at least one power supply unit；The control device is connect with the power supply；
The control device is used for for each power supply unit, according to the frequency and width of the power supply unit pre-set output voltage
The frequency and amplitude of modulated square wave, and the frequency of the set of frequency triangular carrier according to the modulated square wave is respectively set in value, so
The triangular carrier is generated and exported afterwards and the modulated square wave is modulated to obtain to switching tube each in the power supply unit
Driving signal；And for controlling each switching tube according to the driving signal, obtain the output voltage of the power supply unit.
The utility model has the advantages that
The control method of power supply provided in an embodiment of the present invention, apparatus and system include for power supply when controlling power supply
Each power supply unit, according to power supply unit pre-set output voltage (i.e. user set desired output voltage) frequency and amplitude
The frequency and amplitude of modulated square wave is respectively set；And the frequency of the set of frequency triangular carrier according to modulated square wave；Set it
Triangular carrier is generated and exported according to the parameter of setting afterwards and modulated square wave is modulated to obtain each switching tube in power supply unit
The output electricity of the power supply unit can be obtained according to each switching tube in obtained driving signal control power supply unit for driving signal
Pressure.Namely the embodiment of the present invention is realized and is controlled by square-wave frequency modulation power supply, can promote DC bus utilization rate.
Further, in the embodiment of the present invention, since modulating wave uses square wave, work as power supply unit pre-set output voltage
Frequency when being greater than default high frequency threshold value (such as 2KHZ) can also be by the set of frequency of modulated square wave namely in high frequency scene
It is the frequency phase with modulated square wave by the set of frequency of triangular carrier to be equal with the frequency of power supply unit pre-set output voltage
Deng, guarantee power supply unit final output voltage frequency it is equal with carrier frequency, can effectively reduce within a modulation period
The number turned on and off reduces the switching loss of power supply unit, so that power supply heat sinking is easier to control.
Further, in order to obtain higher voltage, the power supply in the embodiment of the present invention may include multiple power supply units,
And this multiple power supply unit is sequentially connected in series, electric power output voltage is the sum of multiple power supply unit output voltages, relatively existing use
Intermediate frequency power supply needs in such a way that step-up transformer obtains high voltage, and structure is more simple, cost is lower and is easier to safeguard.
Further, when power supply includes multiple power supply units in the embodiment of the present invention, in modulation to each power supply unit
Carrier wave carries out phase-shifting carrier wave processing, therefore can be effectively reduced in switch conduction and turn off process
Further, when power supply includes multiple power supply units in the embodiment of the present invention, in modulation to each power supply unit
Carrier wave is handled using phase-shifting carrier wave, can also effectively reduce the harmonic content of output voltage.
Further, square-wave frequency modulation provided in an embodiment of the present invention is suitable for the hair wave mode of two level or three level,
It is also applied for the output of single-phase and three-phase modulations, adaptability and versatility are good.
Detailed description of the invention
Fig. 1 is the control method flow diagram of the power supply in the embodiment of the present invention one；
Fig. 2 is the power system structure schematic diagram in the embodiment of the present invention two；
Fig. 3 is a kind of topological structure schematic diagram of power supply in Fig. 2；
Fig. 4 is another topological structure schematic diagram of power supply in Fig. 2；
Fig. 5 is a kind of structural schematic diagram of control device in Fig. 2；
Fig. 6 is one of the embodiment of the present invention three power supply unit structural schematic diagram；
Fig. 7 is the signal comparison schematic diagram controlled power supply unit in Fig. 6；
Multiple cascade power supply units export schematic diagram in Fig. 8 embodiment of the present invention three；
Vector circle calculates schematic diagram in Fig. 9 embodiment of the present invention three.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is a part of the embodiment in the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one:
For the present embodiment in power control procedure, the modulation system of use is different from existing SPWM (Sinusoidal
Pulse Width Modulation, sinusoidal pulse width modulation) and SVM (Space Vector Modulation, space vector tune
System), but use square-wave frequency modulation.Relatively existing above two modulation system has DC bus utilization rate higher, adjusts at one
The number turned on and off in period processed is less, and switching loss is lower, radiates the advantages that easier to control.Power supply in the present embodiment
Include at least one power supply unit.Preferably, the power supply in the present embodiment may include at least two power supply lists being sequentially connected in series
The voltage of member, such power supply output is the sum of concatenated each power supply unit output voltage, can effectively promote power supply output electricity
Pressure.Namely the power supply in the present embodiment can be high-voltage cascade type intermediate frequency power supply.Relatively existing intermediate frequency power supply is needed using boosting
Transformer obtains the mode of high voltage, and structure is more simple, cost is lower and is easier to safeguard.
It should be understood that the power supply unit number that the power supply in the present embodiment includes can be according to actual output voltage need
The factors flexible setting such as seek, and the output voltage for multiple power supply units that power supply includes in the present embodiment can be all equal,
It is unequal with other that it can be set as at least one according to actual needs.In addition, it is to be understood that the power supply in the present embodiment
When including multiple power supply units, the connection relationship between each power supply unit is not limited to connect, according to actual needs can also be into
Row is adjusted flexibly.
In the present embodiment, the control method to power supply includes carrying out below shown in FIG. 1 to each power supply unit of power supply
Control:
S101: the frequency and amplitude of power supply unit pre-set output voltage are obtained；The pre-set output voltage can be user's root
According to the output voltage of the desired power supply unit of actual demand, frequency and amplitude can also be flexible according to current demand by user
Setting.
S102: the frequency and width of modulated square wave are respectively set according to the frequency of power supply unit pre-set output voltage and amplitude
Value.
It can be equal with the frequency of power supply unit pre-set output voltage by the set of frequency of modulated square wave in the present embodiment.
It, can basis for determining the amplitude of modulated square wave according to the amplitude of power supply unit output voltage in the present embodiment
Amplitude, the duty ratio of output voltage determine that output voltage is high level time ton, further according to ton, utilize the period of carrier wave, amplitude
Determine the amplitude of modulated square wave.Specific calculation can use the calculation of existing any maturation.Details are not described herein.
S103: according to the frequency of the set of frequency triangular carrier of modulated square wave.
In the present embodiment, existing way can use for the determination of triangular carrier amplitude, details are not described herein.
S104: generating according to above-mentioned setting and export triangular carrier and modulated square wave is modulated, and obtains in power supply unit
The driving signal of each switching tube.
S105: each switching tube in power supply unit is controlled according to driving signal, finally obtains the output voltage of power supply unit.
The control to each power supply unit output voltage can be realized by square-wave frequency modulation by step described in Fig. 1.Work as electricity
Source includes multiple concatenated power supply unit series connection, and output voltage is just the sum of multiple concatenated power supply unit output voltages.
In the present embodiment, when the frequency of power supply unit output voltage is greater than default high frequency threshold value (such as 2KHZ), it is believed that
Export high-frequency voltage.The case where being greater than default high frequency threshold value for the frequency of output voltage, the present embodiment can also be by triangle
The set of frequency of carrier wave is equal with the frequency of modulated square wave.Since the frequency of output voltage is equal with modulated square wave frequency, because
The frequency of this finally obtained output voltage is equal with carrier frequency.This can also be effectively reduced in internal modulation modulation period
The intersection number of square wave and triangular wave, and then the number turned on and off in a modulation period is reduced, switching loss is reduced,
So that power supply heat sinking is easier to control.It should be understood that must be the high frequency threshold value flexible setting in the present embodiment, however it is not limited to above-mentioned
Exemplary 2KHZ.Such as when can be set to guarantee preferable modulation effect, lowest carrier frequency that carrier frequency can take
Value.
In the present embodiment, when power supply be cascade connection type power supply when comprising at least two power supply lists being sequentially connected in series
First final output is frequency and the identical square wave of amplitude.Therefore in the present embodiment in order to switch conduction is effectively reduced and turned off
In journeyCan to the carrier wave of each power supply unit carry out phase-shifting carrier wave processing so that each power supply unit output phase difference according to
Secondary deviation predetermined angle α.
Specifically, in the present embodiment, exporting triangular carrier for a certain power supply unit and modulated square wave being modulated it
Before, further include the power supply unit is corresponded to the triangular carrier of the relatively upper power supply unit of phase of triangular carrier phase shift it is pre-
If angle [alpha], the phase difference of each power supply unit output successively deviation predetermined angle α is ensured that in this way.It should be understood that working as
When power supply unit is first power supply unit in series line, it may not be necessary to carry out carrier phase processing.
For example, it is assumed that current power includes three power supply units being sequentially connected in series 1, power supply unit 2, power supply unit 3, wherein
Power supply unit 1 is first power supply unit in series connection, and the carrier wave of power supply unit 1 does not need to carry out phase shift, power supply unit 2
Carrier wave opposed power unit 1 the mobile predetermined angle α of carrier wave, the carrier wave of the carrier wave opposed power unit 2 of power supply unit 3 is mobile
Predetermined angle α.And it should be understood that the mobile direction of each power supply unit carrier wave is identical in the present embodiment, and carrier wave moves
Dynamic direction can be positive with flexible setting namely predetermined angle α, or negative.
Therefore in order to guarantee that power supply unit exports symmetrical square wave, it need to guarantee that the driving signal (namely PWM wave) generated is non-
Symmetrically, therefore in the minimum point of each carrier cycle and highest point fiducial value is updated, namely updates the polarity of modulated square wave.Cause
This, in above-mentioned S104, generates and is exported according to above-mentioned setting triangular carrier and modulated square wave is modulated and includes:
The triangular carrier and modulated square wave set is exported simultaneously；
The polarity of modulated square wave is updated in each minimum point of triangular carrier and highest point；
According to the corresponding driving signal generated and export each switching tube of the intersection point of triangular carrier and modulated square wave.
The present embodiment, which is realized, controls power supply by square-wave frequency modulation, can promote DC bus utilization rate.And this implementation
It, can be directly by the set of frequency of triangular carrier in example when the frequency of power supply unit pre-set output voltage is greater than default high frequency threshold value
Be it is equal with the frequency of modulated square wave, guarantee power supply unit final output voltage frequency it is equal with carrier frequency, can effectively subtract
Few number turned on and off within a modulation period, reduces the switching loss of power supply unit.In addition, higher in order to obtain
Voltage, the power supply for originally applying example can directly series-connection power supplies unit lifting output voltage, relatively existing use intermediate frequency power supply needs be adopted
The mode of high voltage is obtained with step-up transformer, structure is more simple, cost is lower and is easier to safeguard.
In addition, carrying out phase-shifting carrier wave to the carrier wave of each power supply unit in modulation when this power supply includes multiple power supply units
Processing, therefore can be effectively reduced in switch conduction and turn off processThe harmonic wave that output voltage can also be effectively reduced contains
Amount.
Originally the square-wave frequency modulation for applying example offer is suitable for the hair wave mode of two level or three level, is also applied for single-phase and three
Mutually modulation output, adaptability and versatility are good.
Embodiment two:
It is shown in Figure 2, present embodiments provide a kind of power-supply system, including power supply 21 and control device 22；Power supply packet
At least one power supply unit 211 is included, control device 22 is connect with power supply 21.Power supply 21 in the present embodiment may include at least two
The voltage of a power supply unit being sequentially connected in series, the output of such power supply is the sum of concatenated each power supply unit output voltage, can be with
Effectively promote electric power output voltage.Namely the power supply in the present embodiment can be high-voltage cascade type intermediate frequency power supply.In relatively existing
Frequency power needs in such a way that step-up transformer obtains high voltage, and structure is more simple, cost is lower and is easier to safeguard.It answers
When the power supply unit number that the power supply in understanding, the present embodiment includes can be according to the spirit of the factors such as actual output voltage demand
Setting living, and the output voltage for multiple power supply units that power supply includes in the present embodiment can be all equal, it can also be according to reality
It is unequal with other that border demand is set as at least one.It is illustrated below with two kinds of power supply 21 specific topological structures.
Please join respectively as shown in figure 3 and figure 4.Power supply 21 shown in Fig. 3 includes power supply unit A1, the power supply unit A2, electricity being sequentially connected in series
Source unit A3, power supply unit A4, power supply unit A5, output voltage be power supply unit A1, power supply unit A2, power supply unit A3,
The sum of power supply unit A4, power supply unit A5 output voltage.Power supply 21 shown in Fig. 4 further includes the electricity being sequentially connected in series compared with Fig. 3
Source unit B1, power supply unit B2, power supply unit B3, power supply unit B4, power supply unit B5, therefore when the output of each power supply unit electricity
When pressing equal, the output voltage of the power supply 21 in Fig. 4 is 2 times of output voltage shown in Fig. 3.
N in Fig. 3 and Fig. 4 is reference voltage.It should be understood that the specific topological structure of power supply 21 can in the present embodiment
It can also flexibly be set according to practical application scene with the specific structure of flexible setting according to actual needs, and each power supply unit.
In the present embodiment, control device 22 is controlled to each power supply unit, using square-wave frequency modulation mode as shown in embodiment one
Method controls each power supply unit, relative to existing SPWM and SVM, has DC bus utilization rate higher, adjusts at one
The number turned on and off in period processed is less, and switching loss is lower, radiates the advantages that easier to control.Specifically, control device
22 the frequency and amplitude of modulated square wave are respectively set according to the frequency and amplitude of power supply unit pre-set output voltage, and according to modulation
The frequency of the set of frequency triangular carrier of square wave, then generates according to above-mentioned setting and exports triangular carrier and modulated square wave carries out
Modulation obtains the driving signal to switching tube each in power supply unit；And each switch of power supply unit is controlled according to driving signal
Pipe, obtains the output voltage of power supply unit.
Specifically, shown in Figure 5, the control device 22 of power supply includes signal processor 221 and control in the present embodiment
Device 222；Wherein:
Signal processor 221 is used to be directed to each power supply unit, according to the frequency and amplitude of power supply unit pre-set output voltage
The frequency and amplitude of modulated square wave, and the frequency of the set of frequency triangular carrier according to the modulated square wave is respectively set, and
It is modulated for triangular carrier and the modulated square wave to be generated and exported according to above-mentioned setting, is respectively switched in out-put supply unit
The driving signal of pipe.
In the present embodiment, the set of frequency of modulated square wave can be and the default output electricity of power supply unit by signal processor 221
The frequency of pressure is equal.It, can be according to output electricity for determining the amplitude of modulated square wave according to the amplitude of power supply unit output voltage
Amplitude, the duty ratio of pressure determine that output voltage is high level time ton, further according to ton, determined using the period of carrier wave, amplitude
The amplitude of modulated square wave.Specific calculation can use the calculation of existing any maturation.Details are not described herein.
In the present embodiment, when the frequency of power supply unit output voltage is greater than default high frequency threshold value (such as 2KHZ), it is believed that
Export high-frequency voltage.Signal processor 221 is also used to be the frequency phase with modulated square wave by the set of frequency of triangular carrier
Deng.Since the frequency of output voltage is equal with modulated square wave frequency, the frequency and carrier frequency of finally obtained output voltage
Rate is equal.This can also effectively reduce the intersection number in an internal modulation modulation period square wave and triangular wave, and then reduce one
The number turned on and off in a modulation period reduces switching loss, so that power supply heat sinking is easier to control.It should be understood that
It is the high frequency threshold value flexible setting in the present embodiment, however it is not limited to the 2KHZ of above-mentioned example.Such as it can be set to guarantee
When preferable modulation effect, lowest carrier frequency value that carrier frequency can take.
Each switch that controller 222 is used to control driving signal input power unit in power supply unit is in control power supply
The output voltage of unit.
In the present embodiment, when power supply 21 be cascade connection type power supply when comprising at least two power supplys being sequentially connected in series
Unit final output is frequency and the identical square wave of amplitude.Therefore in the present embodiment in order to switch conduction and shutdown is effectively reduced
In the processSignal processor 21 can also carry out phase-shifting carrier wave processing to the carrier wave of each power supply unit, so that each power supply list
The phase difference successively deviation predetermined angle α of member output.Signal processor 21 specifically can realize that carrier wave moves by phase-shifting transformer
Phase processor.Specifically, signal processor 21 is in output triangular carrier and before modulated square wave is modulated, by the three of power supply unit
The phase shift predetermined angle α of the triangular carrier of the relatively upper power supply unit of the phase of angle carrier wave, ensures that each electricity in this way
The phase difference successively deviation predetermined angle α of source unit output.It should be understood that when power supply unit is first in series line
When power supply unit, it may not be necessary to carry out carrier phase processing.And the mobile direction of each power supply unit carrier wave is in the present embodiment
It is identical, and the direction of carrier wave movement can be positive with flexible setting namely predetermined angle α, or it is negative.
Therefore in order to guarantee that power supply unit exports symmetrical square wave, it need to guarantee that the driving signal (namely PWM wave) generated is non-
Symmetrically, therefore signal processor 21 is in the minimum point of each carrier cycle and highest point update fiducial value, namely updates modulation methods
The polarity of wave.Therefore, signal processor 21 generates according to above-mentioned setting and exports triangular carrier and modulated square wave is modulated packet
It includes:
The triangular carrier and modulated square wave set is exported simultaneously；
The polarity of modulated square wave is updated in each minimum point of triangular carrier and highest point；
According to the corresponding driving signal generated and export each switching tube of the intersection point of triangular carrier and modulated square wave.
It should be understood that the signal processor 21 in the present embodiment can pass through DSP (Digital Signal
Processing it) realizes, and runs can be specifically provided and realize the various waves of generation in continuously increase and decrease technical approach.
Control device 22 in the present embodiment controls power supply by square-wave frequency modulation, can promote DC bus utilization rate.
And the set of frequency of triangular carrier directly can be, guarantee equal with the frequency of modulated square wave according to concrete application by control device 22
The frequency of power supply unit final output voltage is equal with carrier frequency, can effectively reduce and turn on and off within a modulation period
Number, reduce the switching loss of power supply unit.
In addition, in order to obtain higher voltage, originally apply example power supply can direct series-connection power supplies unit lifting output voltage,
It is relatively existing in such a way that intermediate frequency power supply needs to obtain high voltage using step-up transformer, structure is more simple, cost is lower
And it is easier to safeguard.
In addition, when this power supply includes multiple power supply units, control device 22 in modulation to the carrier wave of each power supply unit into
The processing of row phase-shifting carrier wave, therefore can be effectively reduced in switch conduction and turn off processOutput voltage can also be effectively reduced
Harmonic content.
Embodiment three:
In order to better understand the present invention, the present embodiment is with a kind of tool of power supply unit in Fig. 3 and Fig. 4 in embodiment two
The structure that body is realized, and further illustration is done to the solution of the present invention and effect in conjunction with square wave function.
The electrical diagram of the power supply unit of example shown in Figure 6, power supply unit include tetra- switching tubes of Q1, Q2, Q3 and Q4.
It should be understood that the switching tube in the present embodiment specifically can be using devices such as IGBT, MOSFET, IGCT.As described above, right
It is as follows in the control process of the power supply unit:
Obtain the frequency and amplitude of power supply unit pre-set output voltage.
The frequency and amplitude (Vr of modulated square wave are respectively set according to the frequency of power supply unit pre-set output voltage and amplitude
With-Vr)；It is specifically equal with the frequency of power supply unit pre-set output voltage by the set of frequency of modulated square wave.
The set of frequency of triangular carrier is equal for the frequency of modulated square wave.
It is generated according to setting and exports triangular carrier and modulated square wave is modulated, obtain each Q1, Q2, Q3 in power supply unit
With the driving signal of tetra- switching tubes of Q4；
Tetra- switching tubes of Q1, Q2, Q3 and Q4 are controlled respectively most according to the driving signal of tetra- switching tubes of Q1, Q2, Q3 and Q4
U shown in Fig. 7 is exported eventuallyout.T in Fig. 7on1And Ton2Respectively time of the power supply unit in positive negative cycle output high level, Ton1
=Ton2=Ton。TPwmFor the period of triangular carrier, it is also equal to the period of modulated square wave, wherein TPwmInclude 6 Ton。
By the available following control planning of Fig. 7:
1.Vr > Vc, Q1 conducting, Q2 are closed；- Vr > Vc, Q3 conducting, Q4 are closed；
2.Vr > Vc, Q1 conducting, Q2 are closed；- Vr < Vc, Q3 closing, Q4 conducting；
3.Vr < Vc, Q1 closing, Q2 conducting；- Vr < Vc, Q3 closing, Q4 conducting；
4.Vr < Vc, Q1 closing, Q2 conducting；- Vr < Vc, Q3 closing, Q4 conducting；
5.Vr < Vc, Q1 closing, Q2 conducting；- Vr > Vc, Q3 conducting, Q4 are closed；
6.Vr > Vc, Q1 conducting, Q2 are closed；- Vr > Vc, Q3 conducting, Q4 are closed.
It is shown in Table 1 according to the switch-turn-ON states for controlling each switching tube above.
Table 1
| 1 | 2 | 3 | 4 | 5 | 6 | |
| Q1 | ON | ON | OFF | OFF | OFF | ON |
| Q2 | OFF | OFF | ON | ON | ON | OFF |
| Q3 | ON | OFF | OFF | OFF | ON | ON |
| Q4 | OFF | ON | ON | ON | OFF | OFF |
As can be seen from FIG. 7, single power supply unit output square wave function is as follows:
By f1(t) it is launched into Fourier space:
∵ f1 (t) is odd function
∴a0=an=0
Abbreviation is carried out to above formula to obtain:
Formula is brought into obtain:
Carrier frequency again
The output voltage of single power supply unit contains the odd harmonics such as 1,3,5 ..., wherein fundamental wave:
From deriving above, the amplitude of fundamental voltage output of voltage is by TonIt determines, the frequency of output voltage is equal to carrier frequency
wpwm。
For multiple power supply unit cascade forms, the equal output frequency of each unit and the identical square wave of amplitude, but pass through
Phase-shifting carrier wave, so that the phase deviation predetermined angle of outputTdFor delay time.By taking three units as an example, cascade
Electric power output voltage afterwards is shown in Figure 8.Therefore phase shift carrier wave is used, can effectively reduce in switch conduction and turn off process
When k power supply unit cascade, the voltage f (t) of output:
Due to the fundamental wave vector phase phase difference α of each unit, can be solved by vector circle, wherein α is phase shift
Angle, as shown in Figure 9:
The amplitude of cascaded-output voltage fundamental is as follows at this time:
In practical applications to guarantee that output voltage adjustable range is sufficiently wide, α levels off to 0:
∵α≈0
To sum up: concatenation unit output voltage amplitude
Concatenation unit number and TonDetermine that the amplitude of output voltage, carrier frequency determine the frequency of output voltage.
Work as TonWhen=0, individual unit output voltage amplitude isIt is modulated compared to SVM, DC bus is utilized and improvedIt is modulated compared to SPWM, DC bus utilization rate improves
To sum up, the present invention at least has following advantages:
Square-wave frequency modulation is used, so that output voltage frequency is equal to carrier frequency；
Using square-wave frequency modulation, DC bus utilization rate is high；
Using phase-shifting carrier wave, can have reduces output
It is applicable to the hair wave mode of two level；
Using phase-shifting carrier wave, the harmonic content of output voltage can be effectively reduced；
The output of applicable single-phase and three-phase modulations.
The above content is combining specific embodiment to be further described to made by the embodiment of the present invention, cannot recognize
Fixed specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs,
Without departing from the inventive concept of the premise, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to the present invention
Protection scope.
Claims (9)
1. a kind of control method of power supply, which is characterized in that the power supply includes at least one power supply unit；The method packet
It includes:
For each power supply unit, modulation is respectively set according to the frequency of the power supply unit pre-set output voltage and amplitude
The frequency and amplitude of square wave；Wherein, it is and the power supply unit pre-set output voltage by the set of frequency of the modulated square wave
Frequency is equal；
According to the frequency of the set of frequency triangular carrier of the modulated square wave；
The triangular carrier is generated and exported, and the modulated square wave is modulated, obtains respectively switching in the power supply unit
The driving signal of pipe；
Each switching tube in the power supply unit is controlled according to the driving signal, obtains the output voltage of the power supply unit.
2. the control method of power supply as described in claim 1, which is characterized in that according to the set of frequency three of the modulated square wave
The frequency of angle carrier wave includes:
When the frequency of the power supply unit pre-set output voltage is greater than default high frequency threshold value, the frequency of the triangular carrier is set
It is set to equal with the frequency of the modulated square wave.
3. the control method of power supply as claimed in claim 1 or 2, which is characterized in that the power supply includes at least two successively
The power supply unit of series connection.
4. the control method of power supply as claimed in claim 3, which is characterized in that further include: the output triangular carrier,
It further include by the triangle of the relatively upper power supply unit of the phase of the triangular carrier and before being modulated to the modulated square wave
The phase shift predetermined angle α of carrier wave.
5. the control method of power supply as claimed in claim 4, which is characterized in that export the triangular carrier, and to modulation methods
Wave, which is modulated, includes:
The triangular carrier and the modulated square wave are exported simultaneously；
The polarity of the modulated square wave is updated in each minimum point of triangular carrier and highest point；
According to the corresponding driving signal for generating each switching tube of the intersection point of the triangular carrier and the modulated square wave.
6. a kind of control device of power supply, which is characterized in that the power supply includes at least one power supply unit；The control device
Including controller and signal processor；
The signal processor is used to be directed to each power supply unit, according to the frequency of the power supply unit pre-set output voltage and
The frequency and amplitude of modulated square wave is respectively set in amplitude, wherein is and the power supply list by the set of frequency of the modulated square wave
The frequency of first pre-set output voltage is equal；And the frequency of the set of frequency triangular carrier according to the modulated square wave；And it is used for
The triangular carrier is generated and exported, and the modulated square wave is modulated, exports each switching tube in the power supply unit
Driving signal；
The controller is used to the driving signal inputting the power supply unit, controls each switching tube in the power supply unit
Obtain the output voltage of the power supply unit.
7. the control device of power supply as claimed in claim 6, which is characterized in that the signal processor is used in the power supply
When the frequency of unit pre-set output voltage is greater than default high frequency threshold value, it is and the modulation by the set of frequency of the triangular carrier
The frequency of square wave is equal.
8. the control device of power supply as claimed in claims 6 or 7, which is characterized in that the power supply includes at least two successively
The power supply unit of series connection, the signal processor is also used to export the triangular carrier, and carries out to the modulated square wave
Before modulation, by the phase shift predetermined angle α of the triangular carrier of the relatively upper power supply unit of the phase of the triangular carrier.
9. a kind of power-supply system, which is characterized in that including power supply and such as the described in any item control devices of claim 6-8；Institute
Stating power supply includes at least one power supply unit；The control device is connect with the power supply；
The control device is used for for each power supply unit, according to the frequency of the power supply unit pre-set output voltage and amplitude point
Not She Zhi modulated square wave frequency and amplitude, wherein by the set of frequency of the modulated square wave be to preset with the power supply unit
The frequency of output voltage is equal；And the frequency of the set of frequency triangular carrier according to the modulated square wave, it then generates and exports
The triangular carrier, and the modulated square wave is modulated to obtain the driving signal to switching tube each in the power supply unit；
And for controlling each switching tube according to the driving signal, obtain the output voltage of the power supply unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610493814.2A CN106130323B (en) | 2016-06-29 | 2016-06-29 | A kind of control method of power supply, apparatus and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610493814.2A CN106130323B (en) | 2016-06-29 | 2016-06-29 | A kind of control method of power supply, apparatus and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106130323A CN106130323A (en) | 2016-11-16 |
| CN106130323B true CN106130323B (en) | 2018-12-07 |
Family
ID=57286170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610493814.2A Active CN106130323B (en) | 2016-06-29 | 2016-06-29 | A kind of control method of power supply, apparatus and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106130323B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114024433B (en) * | 2022-01-05 | 2022-03-08 | 深圳市永联科技股份有限公司 | Jitter frequency period control method and related device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203071823U (en) * | 2013-01-05 | 2013-07-17 | 辽宁荣信众腾科技有限公司 | A cascaded high-voltage frequency converter formed by power units connected in parallel |
| CN105210285A (en) * | 2013-07-02 | 2015-12-30 | 株式会社村田制作所 | PWM control circuit and switching power supply device |
-
2016
- 2016-06-29 CN CN201610493814.2A patent/CN106130323B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203071823U (en) * | 2013-01-05 | 2013-07-17 | 辽宁荣信众腾科技有限公司 | A cascaded high-voltage frequency converter formed by power units connected in parallel |
| CN105210285A (en) * | 2013-07-02 | 2015-12-30 | 株式会社村田制作所 | PWM control circuit and switching power supply device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106130323A (en) | 2016-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107276448B (en) | A kind of H bridge cascaded multilevel inverter based on phase shift space vector modulating method | |
| JPWO2015105081A1 (en) | Power converter and three-phase AC power supply | |
| CN108429469B (en) | Z-source two-stage matrix converter modulation method based on carrier PWM | |
| CN108683350A (en) | A kind of three level NPC converter particular harmonics optimization modulation strategy | |
| CN109787483A (en) | Control method of power supply for capacitor ripple test and power supply for capacitor ripple test | |
| CN104410311B (en) | Discontinuous PWM modulation midpoint balance method of three-level inverter | |
| JPWO2013076937A1 (en) | AC conversion circuit | |
| CN108631628B (en) | Capacitor voltage balance control method for H-bridge cascade rectifier | |
| CN107302318B (en) | A kind of phase shift space vector modulating method based on H bridge cascaded multilevel inverter | |
| CN102545681A (en) | Step wave synthesis three-phase inverter capable of eliminating low frequency harmonic waves and control method | |
| CN105720607A (en) | Inverter parallel control method for double-droop control with elastic active power allocation | |
| US10381921B1 (en) | Soft-switching triangular current mode control for three phase two-level converters with power factor control | |
| CN106130323B (en) | A kind of control method of power supply, apparatus and system | |
| Omar et al. | Comparative study of a three phase cascaded H-bridge multilevel inverter for harmonic reduction | |
| CN103490651A (en) | Full bridge inverter UPWM control method for eliminating zero passage oscillation | |
| CN104124882A (en) | Variable-frequency and variable-voltage multi-level high-power voltage source | |
| Sarker et al. | FPGA-based variable modulation-indexed-SPWM generator architecture for constant-output-voltage inverter applications | |
| Liu et al. | Neutral-point voltage balance control and oscillation suppression for VIENNA rectifier | |
| CN106026730A (en) | Control method, apparatus, and system for three-level power supply | |
| CN103997249A (en) | Method for controlling distributed power grid-connected inverter | |
| CN214591178U (en) | Composite mining frequency converter based on power electronic transformer | |
| Zhang et al. | Research on a discontinuous three-dimensional space vector modulation strategy for the three-phase four-leg inverter | |
| CN104852557A (en) | Digital-analog hybrid phase-shift frequency-multiplication modulation method for power converter | |
| Wei et al. | A three-phase PWM rectifier with reactive power compensation function | |
| CN111416537B (en) | Rectifier and modulation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |