CN107947614A - Inverter and its short circuit loss suppressing method based on the switching of input terminal series voltage - Google Patents
Inverter and its short circuit loss suppressing method based on the switching of input terminal series voltage Download PDFInfo
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- CN107947614A CN107947614A CN201711246118.2A CN201711246118A CN107947614A CN 107947614 A CN107947614 A CN 107947614A CN 201711246118 A CN201711246118 A CN 201711246118A CN 107947614 A CN107947614 A CN 107947614A
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- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
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- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/0077—Plural converter units whose outputs are connected in series
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of inverter based on the switching of input terminal series voltage and its short circuit loss suppressing method, method to include：Input direct voltage using the output DC voltage of prime straight convertor as rear class inverter；Using rear class contravarianter voltage outer loop feedback inverter output voltage, inductor current signal double-closed-loop control, the pulse control signal of rear class inverter leg switching device is obtained, to realize inverter output short-circuit current limliting；Also, inductor current signal is transformed to d. c. voltage signal by rectifying and wave-filtering, and the output serial module structure of prime straight convertor is controlled according to comparative result compared with comparison reference signal, adjusts DC voltage size.Inverter includes：Prime straight convertor and rear class inverter, short-circuit condition keep judgment module, output series voltage handover module.The present invention faster can realize the reduction of contravarianter voltage stress in transcient short circuit time, preferably suppress the loss of switching device during inverter short circuit in dynamic process.
Description
Technical field
The present invention relates to a kind of inverter and its short circuit loss suppressing method based on the switching of input terminal series voltage, belong to
The technical field of electrical energy changer.
Background technology
At present in the power-supply system distributed electrical energy system in new energy, aircraft and electric automobile, modulated using SPWM
The single-phase or three-phase inverter of mode is with its energy conversion efficiency is high, the AC energy harmonic content of offer is small, it is flexible etc. to control
Advantage is widely used.In order to improve the EMI of complete machine and EMC electric properties, need to use in most of application scenarios
The electric topology structure that input terminal is isolated with inverter output end, in order to reduce machine volume weight, which adopts mostly
Realized with high frequency Magnetic isolation mode, therefore generally require to generate surely using DC/DC isolated converters in the input prime of inverter
Fixed DC voltage, the input voltage as rear class inverter.
In addition, in order to improve the reliability of complete machine and security, it is necessary to inverter possess born within a period of time it is certain
Short circuit current flow ability, so as to fuse protecting device, and normal operating conditions is switched fast back after troubleshooting, it is real
The short-circuit protection of existing inversion system.Longer short circuit bear the time be weigh one of inversion system reliability and security it is important
Index.Under conventional short-circuit mode, inverter switch device will not only bear the short circuit current flow much larger than rated current, and hold
By higher input side voltage stress, above-mentioned condition causes switching device loss higher in the case where SPWM modulates HF switch state,
Reduce inversion system short circuit duration in the short-circuit state and reliability.Therefore it is highly desirable exploitation inverter short circuit state
The method that lower switch device loss suppresses.
The content of the invention
The technical problems to be solved by the invention are to overcome the deficiencies of the prior art and provide a kind of based on input terminal series connection
The inverter and its short circuit loss suppressing method of voltage switching, solve existing inverter and are modulated in SPWM under HF switch state
The problem of causing switching device loss higher, causing the short circuit duration of inversion system in the short-circuit state short low with reliability.
It is of the invention that above-mentioned technical problem is specifically solved using following technical scheme：
Suppressing method is lost in inverter short circuit based on the switching of input terminal series voltage, comprises the following steps：
Input direct voltage using the output DC voltage of prime straight convertor as rear class inverter；
Utilize outer voltage feedback inverter output voltage V in the rear class inverter of acquisitionaco, inductance in rear class inverter
Current signal value of feedback ILDouble-closed-loop control is carried out, obtains the pulse control signal S of rear class inverter leg switching devicew, with reality
Existing rear class inverter output short-circuit current limliting；
Also, by inductor current signal value of feedback I in the rear class inverterLDC voltage is transformed to by rectifying and wave-filtering
Signal ILd, and by itself and comparison reference signal ILfBy comparing, controlled the output of prime straight convertor straight according to comparative result
Flow voltage swing.
Further, as a preferred technical solution of the present invention, double-closed-loop control is carried out in the method, specific bag
Include following steps：
By the rear class contravarianter voltage outer loop feedback inverter output voltage V of acquisitionacoWith output AC voltage benchmark Vacref
By PID loop section computing after being compared, obtained control signal IrefAs the inductive current reference signal of current inner loop, and
With inductor current signal I in rear class inverterLMore afterwards by PID loop section computing, AC controling signal is obtained；
The AC controling signal is modulated by SPWM, obtains the Pulse Width Control letter of rear class inverter leg switching device
Number Sw。
Further, as a preferred technical solution of the present invention, prime is controlled according to comparative result in the method
The output DC voltage size of straight convertor, specifically includes：
As the d. c. voltage signal ILdMore than comparison reference signal ILfWhen, control makes the output of prime straight convertor straight
The numerical value of galvanic electricity pressure less than non-shorting state；
As the d. c. voltage signal ILdLess than comparison reference signal ILfWhen, control the output of prime straight convertor straight
Galvanic electricity pressure exports for rated direct voltage.
The present invention also proposes a kind of inverter based on the switching of input terminal series voltage, including：
Prime straight convertor and rear class inverter, the wherein secondary of prime straight convertor use several output modules
The structure of series connection, and several described output modules output it input direct voltage of the DC voltage as rear class inverter；
Short-circuit condition keeps judgment module, for carrying out double-closed-loop control according to the input direct voltage of rear class inverter,
Obtain the pulse control signal S of rear class inverter leg switching devicew, to realize inverter output short-circuit current limliting；And for obtaining
The switch-over control signal of output series voltage handover module must be controlled；
Series voltage handover module is exported, is directly converted for switching connected prime according to switch-over control signal control
The output module quantity of device, to control the output DC voltage size of prime straight convertor.
Further, judgment module is kept to include as a preferred technical solution of the present invention, the short-circuit condition：
Inductive current monitoring unit, for detecting and feeding back inductor current signal value of feedback I in rear class inverterL；
Double-closed-loop control unit, for the rear class contravarianter voltage outer loop feedback inverter output voltage V according to acquisitionaco
With inductor current signal value of feedback I in rear class inverterLDouble-closed-loop control is carried out, obtains rear class inverter leg switching device
Pulse control signal Sw；And for by inductor current signal value of feedback I in the rear class inverterLIt is transformed to by rectifying and wave-filtering
D. c. voltage signal ILd, and by itself and comparison reference signal ILfCompare, and output series voltage switching is obtained according to comparative result
The switch-over control signal of module；
Further, include as a preferred technical solution of the present invention, the output series voltage handover module：
Switching switch control unit, for receiving switch-over control signal and accordingly generating the gating of output module switching switch
Control signal；
Output module switching switch, for switching the output of connected prime straight convertor according to gate control signal
Module number, to control the output DC voltage size of prime straight convertor.
Further, as a preferred technical solution of the present invention, the secondary of the prime straight convertor is using extremely
The structure of few two output modules series connection.
Further, sensed as a preferred technical solution of the present invention, the inductive current monitoring unit using LEM
Device.
Further, multigroup list is used as a preferred technical solution of the present invention, the output module switching switch
Knife controllable switch is formed.
The present invention uses above-mentioned technical proposal, can produce following technique effect：
The present invention cascades single-phase or three-phase inverter two-stage type in high-frequency isolation type output voltage series connection straight convertor
In topology, the short trouble of rear class inverter is judged that signal is sent to prime straight convertor, controls prime straight convertor
Output serial module structure quantity, to reduce the input voltage grade of rear class inverter, realizing reduces rear class inverter short circuit state
The purpose of lower switch device loss.
By varying this mode of the quantity of prime straight convertor output serial module structure, due to being directly to output voltage
Grade switches over, and compared to the signal criterion for the output-voltage loop for adjusting prime straight convertor, saves loop adjustment institute
The dynamic response time needed, it also avoid the ovennodulation phenomenon in loop adjustment, can faster be realized in transcient short circuit time
The reduction of the voltage stress of inverter, so as to preferably suppress short-circuit inverter switch device loss in dynamic process.
Brief description of the drawings
Fig. 1 is the structure diagram of inverter of the present invention based on the switching of input terminal series voltage.
Fig. 2 is the fundamental diagram of double-closed-loop control unit in the present invention.
Fig. 3 (a), Fig. 3 (b) are respectively not use to open under rear class inverter short circuit state during control method proposed by the present invention
Close device source-drain voltage stress and current waveform figure.
Fig. 4 (a), Fig. 4 (b) are respectively that the present invention is switched to short-circuit condition inverter output voltage and filtering by nominal load
Inductive current dynamic waveform figure.
Fig. 5 (a), Fig. 5 (b), Fig. 5 (c) are respectively that by nominal load to be switched to short-circuit condition prime straight for inverter of the present invention
DC converter output voltage, inverter switching device source-drain voltage waveform, inverter switching device current stress dynamic waveform figure.
Fig. 6 (a), Fig. 6 (b) are respectively inverter short circuit state lower bridge arm switch tube voltage and current stress ripple in the present invention
Shape figure.
Embodiment
Embodiments of the present invention are described with reference to Figure of description.
As shown in Figure 1, the present invention provides a kind of inverter and its short circuit loss based on the switching of input terminal series voltage
Suppressing method, the inverter mainly include prime straight convertor primary side inverter module 1, prime straight convertor list primary side around
The more vice-side winding structure high frequency transformers 2 of group, prime straight convertor secondary output module 3, rear class inverter 4, short-circuit condition
Keep judgment module 5, output series voltage handover module；Wherein, the short-circuit condition keeps judgment module 5 to include inductive current
Monitoring unit, double-closed-loop control unit 6, short-circuit condition feedback unit.And output series voltage handover module is opened including switching
Close control unit, output module switching switch.
In the present embodiment, by taking two sets of output modules are connected as an example, output module switching switch preferably can using multigroup hilted broadsword
The gating circuit 7 that control switch is formed, including contact a and b, and connection contact c.Its connection is that prime straight convertor secondary is adopted
The contact a of hilted broadsword controllable switch is connected to two output modules with the cascaded structure of two output modules 3, and after being connected in series
Between, and contact b is connected to after two use cascaded structures of output modules 3, the connection contact c connections switching of hilted broadsword controllable switch
Switch control unit, according to the control of switching switch control unit so that the hilted broadsword section of connection contact c connects contact a or contact b,
With control switching connection prime straight convertor output module quantity.
The input terminal of the output terminal connection rear class inverter 4 of the prime straight convertor secondary output module, and rear class
The output terminal connection short-circuit condition of inverter 4 keeps judgment module 5, and the short-circuit condition to keep the connection output of judgment module 5
Switching switch control unit in series voltage handover module, and the connection of switching switch control unit connection hilted broadsword controllable switch
Contact c, is consequently formed the short circuit loss suppression circuit of inverter.
In the circuit, the secondary of prime straight convertor uses the structure of multiple output modules series connection, and the prime
The output module of straight convertor outputs it input direct voltage of the DC voltage as rear class inverter.Included using prime
The straight convertor of high-frequency isolation transformer topology realizes DC voltage voltage stabilizing, and the input direct-current as rear class inverter is powered electric
Source, the topology can greatly reduce the volume weight of isolating transformer by high frequency.In addition directly converted to improve prime
The output power of device, voltage class, output voltage cascaded structure are also a kind of common circuit topology, and two are used in the present embodiment
The structure of a output module series connection.The short-circuit condition keeps judgment module, according to the outer voltage and electric current of rear class inverter
Inner ring carries out double-closed-loop control, and the driving of adjusting switch device pulse keeps short circuit current flow constant and sent out to prime direct current source converter
Send switch-over control signal；The output series voltage handover module, it is straight to connect prime according to switch-over control signal control switching
The output module quantity of DC converter, to control the output DC voltage size of prime straight convertor.
On the basis of the above-mentioned inverter circuit switched based on input terminal series voltage, inverter proposed by the present invention is short
Path loss consumes suppressing method, specific as follows：
Input direct voltage using the output DC voltage of prime straight convertor as rear class inverter.
The inverter short circuit current-limiting function is completed by double-closed-loop control unit, when output terminal mutually electricity occurs in rear class inverter
When pressure or line voltage short-circuit conditions, in order to ensure the action message of protective device, often require that inverter possesses the short-circuit shape of holding
The ability of state certain time.According to Fig. 1, outer voltage, the current inner loop control of Double-closed-loop control circuit are carried out to inverter
System, i.e., by outer voltage feedback inverter output voltage V in rear class inverteracoDouble-closed-loop control unit is fed back to, it is inverse with rear class
Become device output voltage reference signal VacrefMore afterwards by PID loop section generation current inner loop reference signal IrefAnd as in electric current
The inductive current reference signal of ring, and the rear class inverter inductance current signal value of feedback I fed back with inductive current monitoring unitL
Control signal is generated by PID loop section more afterwards, the pulse control for producing rear class inverter leg switching device is modulated by SPWM
Signal S processedw, which can control the modulation of inverter leg switching device in the short-circuit state, so as to keep inductive current
No more than limit value.At this time, if limiting current inner loop reference signal I by way of amplitude limit valuerefMaximum amplitude, also just etc.
Imitate in the maximum for limiting inductive current, when under short-circuit condition, rear class inverter inductance current feedback signal back value IL
If more than current inner loop reference signal Iref, then control loop can play controlling switch pulse close inductive current path work(
Can, so as to possess the ability of inductive current current limliting.Which can realize that inverter exports voltage stabilizing function by outer voltage, together
When by setting rear class inverter inductance current signal value of feedback ILWith current inner loop reference signal IrefCurrent inner loop benchmark letter
Number proportionate relationship, can realize inverter output short-circuit current limiting capacity.
But in this mode, inductive current current limliting is that output limit is realized by way of controlling switch device duty cycle
Stream, switching device is still in the on off state of high frequency at this time, and the short circuit current flow born is much higher than the electricity under nominal load
Flow valuve, causes switching device loss to be far above rated load condition, causes the accelerated ageing of switching device or even damages, shortens
The working time of switching device in the short-circuit state, reduces the reliability of inverter.With common high frequency power switching device
Exemplified by MOSFET, it is assumed that Pr1For the turn-on consumption of individual devices；Pr2For the turn-off power loss of individual devices；t1For service time；t2
For the turn-off time；uds(t) the instantaneous voltage stress born between switching device hourglass source electrode；id(t) for switching device open with
Drain transient current in turn off process；T is the switch periods time.Then opened in the single switch cycle with turn-off power loss respectively such as formula
(1), shown in (2)：
By formula (1), (2) as it can be seen that switching device is within the turn-on and turn-off time, size is lost in it has with following three conditions
Close：
1. switch wants the length of duration with shut-off；
2. the size of the voltage stress born between switching device source-drain electrode；
3. switching device drain current size.
And in the targeted circuit topology of the present invention, switch time is determined by device self character, and drain current by
Short circuit current flow size determines, therefore is only capable of by reducing source-drain voltage stress to reduce the switch of short-circuit condition lower switch device
Loss.In addition, in bridge type inverse topology, the drain-source voltage stress of switching device is consistent with inverter input voltage value
, therefore can be by controlling the drain-source voltage stress of inverter input direct voltage size controlling switch device.
The present invention is on the basis of inverter double-loop control strategy, by rear class inverter inductance current signal value of feedback ILInstead
In the double-closed-loop control unit fed shown in Fig. 2, which specifically includes diode rectification filter unit 8, comparator, and also
Hilted broadsword controllable switch gating drive circuit is connected, the switching switch control unit of the present embodiment output series voltage handover module is adopted
With hilted broadsword controllable switch gating drive circuit.Its control process is：Inverter leg inductance electricity is obtained using LEM sensor samples
Flow value of feedback IL, after diode rectification filter unit 8, obtained by low-pass filtering directly proportional to inductive current virtual value
D. c. voltage signal ILd, and the reference signal I with setting in a comparatorLfCompare, as d. c. voltage signal ILdJoin more than comparing
Examine signal ILfWhen, then control makes prime straight convertor output DC voltage less than the numerical value of non-shorting state, i.e. control ratio
Compared with device output high level as switch-over control signal, hilted broadsword controllable switch is generated after hilted broadsword controllable switch gating drive circuit
Gate control signal Ef, to control the contact c connecting terminal a in hilted broadsword controllable switch, control the straight convertor output voltage to be
Half under non-shorting state so that rear class inverter input direct-current is changed into half；As stream voltage signal ILdLess than comparison reference
Signal ILfWhen, then it is assumed that rear class inverter is not in short-circuit condition, then comparator output low level is as switch-over control signal, warp
Hilted broadsword controllable switch gate control signal E is generated after crossing hilted broadsword controllable switch gating drive circuitf, control voltage gating hilted broadsword can
Contact c connecting terminal b in control switch, at this time prime straight convertor rated direct voltage output.During described, control is single
Knife controllable switch is switched to a, c contact portion state by b, c contact portion state, and switching prime straight convertor is defeated by two voltages
Go out cascaded structure and be switched to univoltage export structure, by controlling the folding of multigroup hilted broadsword controllable switch, by adjusting series connection mould
Number of blocks reduces the input direct voltage of inverter, reaches drop so as to reduce the output voltage of prime straight convertor
Switching device opens the purpose of voltage stress in turn off process in low inverter.
This example is provided using the inverter short circuit loss Contrast on effect after the present invention, specific as follows：
Respectively as shown in Fig. 3 (a) and Fig. 3 (b), before it is does not use control method of the present invention, after single-phase inverter short circuit
Bridge arm switch drain electric current and drain-source voltage oscillogram, since inverter employs double-loop control strategy, energy at this time
Enough realize the short-circuit current-limiting function of inverter in itself, and the drain-source voltage stress that switching tube is born at this time is 290V.
And Fig. 4 to Fig. 6 is using the inverter short circuit simulation waveform after control method of the present invention.Wherein, Fig. 4 (a) and
Fig. 4 (b) is switched to short-circuit condition inverter output voltage and filter inductance electric current dynamic waveform figure for the present invention by nominal load,
Show that the mode of present invention limitation prime output voltage has no effect on inverter short circuit current-limiting function and short-circuit current value.Fig. 5 (a)
With Fig. 5 (b), Fig. 5 (c) be respectively inverter is switched to short-circuit condition prime straight convertor output voltage, inverse by nominal load
Become device switch source-drain voltage waveform, inverter switching device current stress dynamic waveform figure, prime straight convertor exists as shown in the figure
After receiving short trouble instruction, two groups of output series voltages can be adjusted to one group rapidly, show control method pair of the present invention
The rapidity of inverter input direct voltage adjustment.
The inverter switch device drain current and drain-source voltage oscillogram of Fig. 6 (a) and Fig. 6 (b) can be obtained afterwards,
Drain-source voltage stress is 145V at this time, to use the half of the 290V before control method of the present invention, so as to substantially reduce short
The voltage stress of inverter switch device under line state.
By above-mentioned contrast, it may be verified that the present invention cascades single-phase or three contraries in isolated form output voltage series connection straight convertor
Become in the two-stage type topology of device, the short trouble of rear class inverter is judged that signal is sent to prime straight convertor, before control
The output serial module structure quantity of level straight convertor, to reduce the input voltage grade of rear class inverter, realizes rear class inverter
The purpose that short-circuit condition lower switch device loss reduces.By varying prime straight convertor output serial module structure quantity this
Mode, due to being that directly output voltage grade is switched over, saves loop and adjusts required dynamic response time, also keep away
Exempted from loop adjustment in ovennodulation phenomenon, can faster transcient short circuit time realize inverter voltage stress reduction,
So as to preferably suppress the loss of short-circuit inverter switch device in dynamic process.
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementation
Mode, within the knowledge of a person skilled in the art, can also be on the premise of present inventive concept not be departed from
Make a variety of changes.
Claims (9)
1. suppressing method is lost in the inverter short circuit based on the switching of input terminal series voltage, it is characterised in that comprises the following steps：
Input direct voltage using the output DC voltage of prime straight convertor as rear class inverter；
Utilize outer voltage feedback inverter output voltage V in the rear class inverter of acquisitionaco, inductive current in rear class inverter
Signal value of feedback ILDouble-closed-loop control is carried out, obtains the pulse control signal S of rear class inverter leg switching devicew, after realization
Level inverter output short-circuit current limliting；
Also, by inductor current signal value of feedback I in the rear class inverterLD. c. voltage signal is transformed to by rectifying and wave-filtering
ILd, and by itself and comparison reference signal ILfBy comparing, the output direct current of prime straight convertor is controlled according to comparative result
Press size.
2. suppressing method, its feature is lost in the inverter short circuit according to claim 1 based on the switching of input terminal series voltage
It is, double-closed-loop control is carried out in the method, specifically includes step：
By outer voltage feedback inverter output voltage V in the rear class inverter of acquisitionacoWith output AC voltage benchmark VacrefInto
Row is more afterwards by PID loop section computing, obtained control signal IrefAs the inductive current reference signal of current inner loop, and with
Inductor current signal I in rear class inverterLMore afterwards by PID loop section computing, AC controling signal is obtained；
The AC controling signal is modulated by SPWM, obtains the pulse control signal S of rear class inverter leg switching devicew。
3. suppressing method, its feature is lost in the inverter short circuit according to claim 1 based on the switching of input terminal series voltage
It is, controls the output DC voltage size of prime straight convertor in the method according to comparative result, specifically include：
As the d. c. voltage signal ILdMore than comparison reference signal ILfWhen, control makes prime straight convertor export DC voltage
Less than the numerical value of non-shorting state；
As the d. c. voltage signal ILdLess than comparison reference signal ILfWhen, the output DC voltage of control prime straight convertor
Exported for rated direct voltage.
4. the inverter based on the switching of input terminal series voltage, it is characterised in that including：
Prime straight convertor and rear class inverter, the wherein secondary of prime straight convertor are connected using several output modules
Structure, and several described output modules output it input direct voltage of the DC voltage as rear class inverter；
Short-circuit condition keeps judgment module, for carrying out double-closed-loop control according to the input direct voltage of rear class inverter, obtains
The pulse control signal of rear class inverter leg switching device, to realize inverter output short-circuit current limliting；And it is additionally operable to be controlled
The switch-over control signal of system output series voltage handover module；
Series voltage handover module is exported, for according to switch-over control signal, controlling the defeated of connected prime straight convertor
Go out module number, to control the output DC voltage size of prime straight convertor.
5. the inverter according to claim 4 based on the switching of input terminal series voltage, it is characterised in that the short-circuit condition
Judgment module is kept to include：
Inductive current monitoring unit, for detecting and feeding back inductor current signal value of feedback I in rear class inverterL；
Double-closed-loop control unit, for the inverter output voltage V that in the rear class inverter according to acquisition, outer voltage is fed backaco
With inductor current signal value of feedback I in current inner loopLDouble-closed-loop control is carried out, obtains the arteries and veins of rear class inverter leg switching device
Rush control signal Sw；And for by inductor current signal value of feedback I in the rear class inverterLIt is transformed to directly by rectifying and wave-filtering
Flow voltage signal ILd, and by itself and comparison reference signal ILfCompare, and obtain and export series voltage switching according to comparative result
The switch-over control signal of module.
6. the inverter according to claim 4 based on the switching of input terminal series voltage, it is characterised in that the output series connection
Voltage switching module includes：
Switching switch control unit, for receiving switch-over control signal and accordingly generating the gating control of output module switching switch
Signal；
Output module switching switch, for switching the output module of connected prime straight convertor according to gate control signal
Quantity, to control the output DC voltage size of prime straight convertor.
7. the inverter according to claim 4 based on the switching of input terminal series voltage, it is characterised in that the prime is straight
The secondary of converter uses the structure of at least two output modules series connection.
8. the inverter according to claim 5 based on the switching of input terminal series voltage, it is characterised in that the inductive current
Monitoring unit uses LEM sensors.
9. the inverter according to claim 6 based on the switching of input terminal series voltage, it is characterised in that the output module
Switching switch is formed using multigroup hilted broadsword controllable switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711246118.2A CN107947614B (en) | 2017-12-01 | 2017-12-01 | Inverter and its short circuit loss suppressing method based on the switching of input terminal series voltage |
Applications Claiming Priority (1)
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| JPH0538055A (en) * | 1991-07-25 | 1993-02-12 | Toshiba Corp | Power supply |
| CN101355319A (en) * | 2008-09-17 | 2009-01-28 | 南京航空航天大学 | Method for improving operation reliability of current-control type inverter output short circuit |
| CN101471174A (en) * | 2007-12-27 | 2009-07-01 | 深圳迈瑞生物医疗电子股份有限公司 | Isolation transformer |
| CN102122896A (en) * | 2011-04-15 | 2011-07-13 | 国网电力科学研究院 | Sine wave inverter parallel system with variable current ratio |
| CN102306544A (en) * | 2011-05-24 | 2012-01-04 | 天津三星电子有限公司 | Transformer with conveniently adjusted output |
| CN106411109A (en) * | 2016-09-30 | 2017-02-15 | 许继电源有限公司 | High voltage and low voltage switching circuit for LLC (Logical Link Control) conversion output |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0538055A (en) * | 1991-07-25 | 1993-02-12 | Toshiba Corp | Power supply |
| CN101471174A (en) * | 2007-12-27 | 2009-07-01 | 深圳迈瑞生物医疗电子股份有限公司 | Isolation transformer |
| CN101355319A (en) * | 2008-09-17 | 2009-01-28 | 南京航空航天大学 | Method for improving operation reliability of current-control type inverter output short circuit |
| CN102122896A (en) * | 2011-04-15 | 2011-07-13 | 国网电力科学研究院 | Sine wave inverter parallel system with variable current ratio |
| CN102306544A (en) * | 2011-05-24 | 2012-01-04 | 天津三星电子有限公司 | Transformer with conveniently adjusted output |
| CN106411109A (en) * | 2016-09-30 | 2017-02-15 | 许继电源有限公司 | High voltage and low voltage switching circuit for LLC (Logical Link Control) conversion output |
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| CN107947614B (en) | 2019-11-12 |
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