CN205490216U - Invertion power supply device that mixes mode of switching on - Google Patents
Invertion power supply device that mixes mode of switching on Download PDFInfo
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- CN205490216U CN205490216U CN201620047383.2U CN201620047383U CN205490216U CN 205490216 U CN205490216 U CN 205490216U CN 201620047383 U CN201620047383 U CN 201620047383U CN 205490216 U CN205490216 U CN 205490216U
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- switching
- inverter
- electric charge
- power supply
- voltage
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Abstract
The utility model discloses an invertion power supply device that mixes mode of switching on is applicable to high power density, high -performance single -phase and three -phase invertion power supply. Invertion power supply comprises contravariant bridge, filter inductor, filter capacitance. The device adopts the filter inductor of little inductance value to reduce its volume to reduce switching loss when reducing core loss, dwindle the radiator volume, thereby carry high power density. Nevertheless little filter inductor makes and can work in its electric current each on off cycle in every work frequency in the mode of switching on in succession, also can work in the discontinuous mode of switching on. Therefore, the utility model discloses in every on off cycle, the make -break time through the control power switching element realizes this electric charge amount, makes the device provide standard sinusoidal power supply voltage to arbitrary load.
Description
Technical field
This utility model belongs to field of inserter control, more particularly, to one mixing conducting
The inverter power supply device of pattern.
Background technology
High power density is the inexorable trend of inverter development, but hoisting power density difficulty
Greatly.In inverter, magnetics and radiator are to limit the bottleneck that power density promotes.
High power density to be realized must be effectively reduced volume while improving efficiency.Improve inversion
The efficiency of power supply must reduce the loss of himself, and these losses are concentrated mainly on magnetics
With on switching device.Wherein, the loss of magnetics and volume all with the work side of inverter
Formula is closely related, and the volume of radiator then depends primarily on the loss of switching device.Therefore,
By rational parameter designing and use suitable working method, it is possible to reduce switching device and
While magnetic element loss, effectively reduce the volume of radiator and magnetics.This can
Improve the efficiency of inverter, again can hoisting power density effectively.Research of the present utility model
Object is the three phase full bridge inverter shown in Fig. 1, and its three-phase is full decoupled, can be equivalent to 3
Individual single-phase semi-bridge inversion power supply (as shown in Figure 2), and carry out point according to single-phase semi-bridge inversion power supply
Analysis and control.
In inverter, in each switch periods, switching device can complete once to turn on and off
(such as Fig. 3, switch periods TsIn, switching device is open-minded at the rising edge of drive waveforms,
And turn off at trailing edge), therefore, the loss of switching device is divided into switching loss and on-state loss
Two parts.Wherein, on-state loss is determined by the conduction voltage drop of switching device and the electric current flow through,
Generally cannot change.And switching loss be by switching device during turning on and off voltage with
The overlapping of electric current is produced.Improve switching frequency and switching loss will necessarily be significantly increased, increase and dissipate
The volume of hot device.The switching loss of inverter is reduced therefore, it is necessary to take appropriate measures.
The effective way declining low switching losses at certain switching frequency is to be reduced as far as
Switching device is voltage and the overlapping time of electric current when turning on and off, and this is often by soft
Switching technique realizes, and i.e. after switching device electric current is zero, (or voltage is to make device turn off
When zero, make the device open-minded).In small-power inverter, soft switch technique is mainly by outward
Add resonance circuit to realize.According to its operation principle and circuit position can be divided into Resonant DC Link,
Resonant pole, auxiliary resonance buffering, major-minor on-off circuit, carrier Control etc..Utilize resonance circuit
When realizing Sofe Switch, resonant process can produce the highest voltage stress and electricity on switching device
Stream stress.Therefore, soft switch technique based on resonance circuit is suitable only for small-power field.
Additionally, resonance circuit needs to add auxiliary circuit, electric capacity, inductance and derailing switch are additionally introduced
The auxiliary elements such as part, this makes the control strategy of inverter become extremely complex, affects inversion
The stable operation of power supply.Therefore, in inverter, it should do not increasing resonance circuit as far as possible
On the premise of, it is achieved Sofe Switch.
Magnetics in inverter mainly includes transformator and filter inductance.Wherein, inversion
Transformator in power supply can be removed completely by using technology the most altogether, thus eliminates phase
The loss answered.But, the inductance as filter element cannot be removed, its loss the biggest one
Part concentrates on magnetic core.For reduce loss, we can reduce magnetic core volume (or use
Air core inductor without magnetic core removes core loss completely), but this can make institute under unit volume
The inductance value that can realize is greatly reduced.In inverter, this can make its electric current enter such as figure
DCM shown in 3a.In this mode, owing to inductive current is at each switch
Cycle all can back to zero, make device for power switching achieve zero on the premise of not increasing resonance circuit
The Sofe Switch pattern that electric current is opened, the loss in its opening process is close to zero.Additionally, by
The parasitic capacitance of device for power switching also can realize zero voltage turn-off, makes the loss in turn off process
Less.The reduction of switching loss also can reduce the size of radiator.Therefore, in inverter
Reduce the inductance value of filter inductance, the volume of inductance can be reduced, reduce core loss, also can
Reduce switching loss, reduce the volume of radiator, thus inverter is greatly improved on the whole
Efficiency and power density.Additionally, while reducing inductance value, if ensureing inverter
Output is constant, then inverter can be made to be operated in mixing conduction mode (i.e. band nominal load
Time, in each power frequency period, filter inductance electric current in partial switch cycling in discontinuously leading
Logical pattern, in rest switch cycling in continuous conduction mode).
Inverter for mixing conduction mode needs to enter its duty and mathematical model
Row is analyzed.The most widely used inverter mathematical model is both for inductive current and is operated in
Under continuous mode, the linear state-space averaging model (duty set up for controlled quentity controlled variable with dutycycle
Ratio is defined as: the service time of a switch periods breaker in middle device accounts for the ratio of whole switch periods
Example).And the mathematical modulo when inductive current is operated in DCM, under continuous mode
Type is the most applicable, and its model becomes nonlinearity.Further, mixing conduction mode it is operated in
Under inverter need separately design different control according to the mathematical model under both of which
Device, in addition it is also necessary to consider pattern switching problem.This makes the controller design mixing under conduction mode
Extremely complex.
Utility model content
For the defect that the controller design mixed in prior art under conduction mode is complicated, this reality
The problem being to solve above technology by novel purpose.
For achieving the above object, this utility model provides a kind of inversion electricity mixing conduction mode
Source apparatus, it is characterised in that the AC at inverter is configured with filter inductance, exchange successively
Voltage sensor, filter capacitor, AC current sensor, voltage x current sampling unit and directly
Quantity of electric charge controller, the DC side at inverter is configured with DC bus capacitor, wherein,
Described DC bus capacitor is connected with the input of described inverter bridge；
The outfan of described inverter bridge is connected with described load end by described filter inductance；
Described filter capacitor is connected with described filter inductance, in parallel with described load end；
The input of described voltage x current sampling unit is passed by described voltage sensor and electric current
Sensor is connected with the outfan of described inverter bridge, is used for gathering voltage signal and current signal；Its
Outfan is connected with the input of described direct quantity of electric charge controller, for the voltage that will collect
Signal and current signal output are to described direct quantity of electric charge controller；
The outfan of described direct quantity of electric charge controller inputs with the control signal of described inverter bridge
End is connected, for the voltage signal provided according to described voltage x current sampling unit and current signal
Generate quantity of electric charge control signal, and output this signal to dutycycle computing unit, described duty
According to this signal corresponding duty cycle signals of calculating and export to inverter bridge than computing unit, described
Inverter bridge controls turning on and off of its switching device according to this duty cycle signals.
Preferably, the filter inductance and its current work that use small inductor amount turn on mould in mixing
Formula, i.e. reduces core loss, also reduces switching loss, reduces inductance and heat radiation simultaneously
The volume of device, thus improve power density.
According to another aspect of the present utility model, this utility model provides a kind of mixing conducting
The direct quantity of electric charge controller of pattern, it is characterised in that described direct quantity of electric charge controller includes
Quantity of electric charge control unit and dutycycle computing unit；
Described voltage x current sampling unit is in the start time of kth switch periods, by inversion electricity
The sinusoidal input instruction of source apparatus and output voltage, subtract each other acquisition deviation value by subtractor；
Described quantity of electric charge control unit, according to deviation value and output current sampling data, calculates and exports
Maintaining output voltage in+1 switch periods of kth is the discharge and recharge electric charge needed for standard sine wave
Amount；
Dutycycle computing unit, according to the output signal of described quantity of electric charge control unit, calculates and defeated
Going out the duty cycle signals under corresponding mode of operation, described inverter bridge is according to this duty cycle signals control
Make turning on and off of its switching device.
According to another aspect of the present utility model, this utility model provides a kind of mixing conducting
The direct quantity of electric charge control method of pattern, it is characterised in that said method comprising the steps of:
(1) described inverter power supply device is in the start time of kth switch periods, by described
The sinusoidal input instruction of inverter power supply device is subtracted each other by subtractor with the sampled value of output voltage
Obtain deviation value；
(2) described quantity of electric charge control unit is according to this deviation value and described inverter power supply device
Output current sampling data, calculates and exports+1 switch periods of kth and maintain output voltage to be standard
The discharge and recharge quantity of electric charge needed for sine wave；
(3) described dutycycle computing unit is according to the discharge and recharge quantity of electric charge inputted and corresponding work
Operation mode, calculates the duty cycle signals of device for power switching in inverter bridge, and this dutycycle is believed
Number output to inverter bridge；
(4) described inverter bridge controls opening and closing of its switching device according to this duty cycle signals
Disconnected.
In general, by the above technical scheme that this utility model is contemplated, with prior art
Compare, it is possible to obtain following beneficial effect:
(1) scheme described in the utility model is to make traditional inverter work in mixing to lead
Logical pattern, achieves the Sofe Switch of device for power switching in the case of without extra resonance circuit,
It is greatly reduced or eliminates core loss, efficiently reducing switching loss.
(2) for mixing conduction mode, this utility model is real by calculating next switch periods
Existing output voltage is the filter capacitor discharge and recharge quantity of electric charge needed for standard sine wave, and is converted
This quantity of electric charge is realized for controlling the dutycycle of switching device.It is close that the method is applicable to high power
Degree, high performance single-phase and three phase inverter, especially modular inverse power supply.
Accompanying drawing explanation
Fig. 1 is three phase inverter main circuit topology figure；
Fig. 2 is single-phase semi-bridge type inverter main circuit topology figure；
Fig. 3 a is filter inductance electric current ripple in a switch periods under DCM
Shape schematic diagram；
Fig. 3 b is filter inductance electric current waveform in a switch periods under continuous conduction mode
Schematic diagram
Fig. 4 is mixing conduction mode inverter control structure figure；
Fig. 5 is the control structure figure of direct electric quantity controlling method；
Fig. 6 is inverter power supply device idle voltage output when using this utility model scheme, defeated
Go out electric current, inductive current oscillogram；
Fig. 7 is that inverter power supply device uses band resistive load during this utility model scheme to export
Voltage, output electric current, inductive current oscillogram；
Fig. 8 is that inverter power supply device uses band non-linearity during this utility model scheme to load
Output voltage, output electric current, inductive current oscillogram；
Fig. 9 is inductive current waveform diagram；
In figure: 1, inverter bridge；2, filter inductance；3, AC voltage sensor；4, filter
Ripple electric capacity；5, load end；6, AC current sensor；7, voltage x current sampling unit；
8, direct quantity of electric charge controller；9, DC bus capacitor；10, subtractor；11, inversion electricity
Road.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, with
Lower combination drawings and Examples, are further elaborated to this utility model.Should manage
Solving, specific embodiment described herein only in order to explain this utility model, is not used to
Limit this utility model.
This utility model establishes at continuous mode for the inverter under mixing conduction mode
With the uniform mathematical model under discontinuous mode, and have employed identical control algolithm so that
Inverter under mixing conduction mode is obtained in that excellent control performance.
Fig. 3 a and Fig. 3 b is respectively under DCM and continuous conduction mode filter inductance
Electric current waveform diagram in a switch periods.Wherein, the area of shade all represents
One switch periods flows through the quantity of electric charge Q of filter inductanceL, it is to load the quantity of electric charge consumed
With the discharge and recharge quantity of electric charge sum needed for filter capacitor.Owing to no matter inductive current is in not
Continuous conduction mode or continuous conduction mode, flow through the quantity of electric charge of filter inductance by correspondence
The service time of device for power switching determines, i.e. corresponding with under this pattern device for power switching
Dutycycle also exists relation one to one.Therefore, this utility model using this quantity of electric charge as
Controlled quentity controlled variable founding mathematical models, and achieve corresponding directly quantity of electric charge control method.Accordingly
Closed loop controlling structure as shown in Figure 4.Wherein, direct quantity of electric charge controller is by quantity of electric charge control
Unit processed and dutycycle computing unit two parts composition.By direct quantity of electric charge controller, institute is real
Existing direct quantity of electric charge control method is as shown in Figure 5.Wherein, comparing unit calculates output electricity
Pressure and the inclined difference e of given voltage.Quantity of electric charge control unit is with this inclined difference e and load output
The sampled value of electric current is input, calculates and exports needed for maintaining output voltage to be standard sine wave
Quantity of electric charge QL.Dutycycle computing unit will input QLFor dutycycle d, (dutycycle d is fixed in conversion
Justice is the ratio that in a switch periods, the service time of device for power switching accounts for whole switch periods
Example), and realize quantity of electric charge Q by controlling turning on and off of power deviceL.Realized
Quantity of electric charge QLNeeded for proof load electric current while the quantity of electric charge, it is provided that needed for filter capacitor
The discharge and recharge quantity of electric charge wanted, therefore filter capacitor makes its voltage (i.e. output voltage) by discharge and recharge
Reach the set-point set, finally make inverter just can provide standard to arbitrary load
String ripple is powered.The mathematical model of inverter and controller design are all curved about the quantity of electric charge
Carry out, be the most succinct first-order linear link, and can express uniformly and be continuously turned on
Pattern and two kinds of duties under DCM.Although between the quantity of electric charge and dutycycle
Conversion relation present nonlinearity, but inverter mathematical model based on the quantity of electric charge
Enormously simplify the design of controller.Inverter is finally made to be obtained in that excellent controlling
Energy.
Such as Fig. 4, the inverter power supply device of mixing conduction mode described in the utility model is,
The AC of inverter bridge 1 is configured with filter inductance 2, AC voltage sensor 3, filtering successively
Electric capacity 4 and load end 5.AC in inverter bridge 1 configures AC current sensor 6, electricity
Current voltage sampling unit 7 and direct quantity of electric charge controller 8, DC side configuring direct current lateral capacitance 9.
Wherein,
Described DC bus capacitor 9 is connected with the input of described inverter bridge 1；
The outfan of described inverter bridge 1 is connected with described load end 5 by described filter inductance 2；
Described filter capacitor 4 is connected with described filter inductance 2, in parallel with described load end 5；
The input of described voltage x current sampling unit 7 passes through described voltage sensor and electric current
Sensor is connected with the outfan of described inverter bridge 1, is used for gathering voltage signal and current signal；
Its outfan is connected with the input of described direct quantity of electric charge controller 8, for collecting
Voltage signal and current signal output are to described direct quantity of electric charge controller 8；
The outfan of described direct quantity of electric charge controller 8 is defeated with the control signal of described inverter bridge 1
Enter end to be connected, for the voltage signal provided according to described voltage x current sampling unit 7 and electric current
Signal generates quantity of electric charge control signal, and outputs this signal to dutycycle computing unit, duty
And export to inverter bridge 1 according to this signal corresponding duty cycle signals of calculating than computing unit.Institute
State inverter bridge 1 and control turning on and off of its switching device according to this duty cycle signals.
In the start time of kth switch periods, by by sine input instruction ur(k) and output
Voltage uoK () (i.e. output voltage) subtracts each other the inclined difference e (k) of acquisition by subtractor 10.The quantity of electric charge
Control unit is according to inclined difference e (k) and output electric current ioK (), calculates and exports kth+1 switch week
Phase maintains output voltage to be the quantity of electric charge Q needed for standard sine waveL(k+1).Quantity of electric charge control unit
There is multiple implementation, such as Hysteresis control algorithm etc..
Dutycycle computing unit is according to output signal Q of quantity of electric charge control unitL(k+1), institute is calculated
Dutycycle d (k+1) of the device for power switching of output under corresponding mode of operation, and according to controlling letter
Number d (k+1) controls switching device and turns on and off.
When inductive current is discontinuous, dutycycle and quantity of electric charge QL(k+1) corresponding relation between is
Wherein: E is inverter dc bus phase-to-neutral voltage amplitude；
uoK () is output voltage, can be considered steady state value in a switch periods；
L is the inductance value of filter inductance；
TsFor switch periods, it is steady state value in inverter control.
In a continuous mode, with inverter bridge output voltage uinAs input, load current ioAs
Exogenous disturbances amount, iL、uoFor state variable, TsDuring for the sampling period, the discretization of inverter
State equation can be write
Wherein: φ11、φ12、φ21、φ22、h11、h12、h21、h22For corresponding discretization state
Equation coefficient.Owing to State-space Averaging Principle is to average each switching value, so
iL(k)=QL(k)/Ts, then the dutycycle calculating formula under corresponding continuous mode is
Inverter bridge is according to the dutycycle calculated, by controlling turning on and off of power device
Realize this dutycycle, and then make filter inductance flow through the current waveform shown in Fig. 3, thus realize
Quantity of electric charge Q corresponding to shaded areaL.The quantity of electric charge Q realizedLNeeded for proof load electric current
While the quantity of electric charge, it is provided that the discharge and recharge quantity of electric charge required for filter capacitor, therefore filtered electrical
Hold and make its voltage (i.e. load voltage) reach the set-point set by discharge and recharge, finally make
Inverter can provide standard sine wave to power to arbitrary load.
Scheme described in the utility model is to make traditional inverter work in mixing conducting mould
Formula, achieves the Sofe Switch of device for power switching, greatly in the case of without extra resonance circuit
Width reduces or eliminates core loss, efficiently reduces switching loss.For mixing conducting mould
Formula, this utility model by calculate next switch periods be realize filter capacitor sine needed for
The quantity of electric charge, and converted the dutycycle for controlling switching device to realize this quantity of electric charge.The party
Method is applicable to high power density, high performance single-phase and three phase inverter, especially module
Change inverter.
For verifying practicality of the present utility model, based on single-phase semi-bridge inversion electricity as shown in Figure 2
The topological structure in source, establishes the direct electric quantity controlling method of mixing conduction mode inverter
MATLAB/Simulink phantom, utilizes S-function to realize corresponding control algolithm,
Complete simulating, verifying.Time unloaded, idle voltage output, output electric current, inductive current waveform are such as
Fig. 6, correspondence simulation waveform such as Fig. 7 during band resistive load.Correspondence emulation during band nonlinear load
Waveform such as Fig. 8.Inductive current waveform diagram such as Fig. 9.Simulation result shows, at band arbitrarily
During load, it is sinusoidal wave that inverter can keep output voltage under mixing conduction mode.
The inverter control method proposed can follow the tracks of input command voltage rapidly and accurately, and effectively
Improve unit efficiency.
As it will be easily appreciated by one skilled in the art that and the foregoing is only preferable reality of the present utility model
Execute example, not in order to limit this utility model, all in spirit of the present utility model and principle
Within any amendment, equivalent and the improvement etc. made, should be included in of the present utility model
Within protection domain.
Claims (1)
1. a mixing conduction mode inverter power supply device, it is characterized in that, described supply unit includes inverter bridge, AC in described inverter bridge is configured with filter inductance, AC voltage sensor, filter capacitor, load end, AC current sensor, voltage x current sampling unit and direct quantity of electric charge controller successively, DC side in inverter bridge is configured with DC bus capacitor, wherein
Described DC bus capacitor is connected with the input of described inverter bridge；
The outfan of described inverter bridge is connected with described load end by described filter inductance；
Described filter capacitor is connected with described filter inductance, in parallel with described load end；
The input of described voltage x current sampling unit is connected by the outfan of described voltage sensor with current sensor with described inverter bridge, is used for gathering filter capacitor voltage signal and output current signal；Its outfan is connected with the input of described inverter bridge, and described inverter bridge controls turning on and off of its device for power switching.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108306539A (en) * | 2018-01-22 | 2018-07-20 | 合肥美的电冰箱有限公司 | Control device, method and the refrigerator of variable frequency drives |
| CN112636619A (en) * | 2020-11-24 | 2021-04-09 | 联合汽车电子有限公司 | Inverter bus current calculation method |
| CN112701725A (en) * | 2020-12-22 | 2021-04-23 | 华中科技大学 | Grid-connected inverter with mixed conduction mode |
-
2016
- 2016-01-19 CN CN201620047383.2U patent/CN205490216U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108306539A (en) * | 2018-01-22 | 2018-07-20 | 合肥美的电冰箱有限公司 | Control device, method and the refrigerator of variable frequency drives |
| CN112636619A (en) * | 2020-11-24 | 2021-04-09 | 联合汽车电子有限公司 | Inverter bus current calculation method |
| CN112701725A (en) * | 2020-12-22 | 2021-04-23 | 华中科技大学 | Grid-connected inverter with mixed conduction mode |
| CN112701725B (en) * | 2020-12-22 | 2022-04-12 | 华中科技大学 | Grid-connected inverter with mixed conduction mode |
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