CN108111042A - A kind of single-phase inverter - Google Patents
A kind of single-phase inverter Download PDFInfo
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- CN108111042A CN108111042A CN201810015541.XA CN201810015541A CN108111042A CN 108111042 A CN108111042 A CN 108111042A CN 201810015541 A CN201810015541 A CN 201810015541A CN 108111042 A CN108111042 A CN 108111042A
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- switching tube
- switch pipe
- inductance
- switch
- diode
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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
- H02M7/5387—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 in a bridge configuration
-
- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- 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
- H02M7/539—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 with automatic control of output wave form or frequency
- H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation
-
- 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
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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
Abstract
The invention discloses a kind of single-phase inverters, including switching tube, diode and inductance, the anode of the high potential termination direct-flow input end of first switch pipe and second switch pipe；The low potential of 3rd switching tube and the 4th switching tube terminates the cathode of direct-flow input end；The low potential of first switch pipe terminates the hot end of the 3rd switching tube, and the cold end of second switch pipe connects the hot end of the 4th switching tube by the 6th switching tube；First inductance is connected between the cold end and ac output end of first switch pipe, and the second inductance is connected between the cold end and ac output end of second switch pipe；The cold end of first termination first switch pipe of the 5th switching tube, the anode of second the first diode of termination, the cathode of the first diode connect the cold end of second switch pipe；The anode of second diode connects the hot end of the 4th switching tube, and cathode connects the hot end of the 3rd switching tube.The single-phase inverter circuit of the present invention is simple, efficient, electromagnetic interference is small.
Description
Technical field]
The present invention relates to inverter more particularly to a kind of single-phase inverters.
Background technology]
Inverter is the power inverter that a kind of direct current is converted to exchange, and gird-connected inverter can be realized with power grid with the same phase of frequency
Position is connected to the grid regenerative resource；Single-phase Non-isolated combining inverter, the leakage current that circuit topology generates, which is one, to be relatively difficult to resolve
Certainly the problem of, generally use wave filter are changed circuit modulation system or are solved using new topology.
Inverter can be divided into semi-bridge inversion power supply and full bridge inverse conversion power by its circuit form to divide.Wherein full-bridge is inverse
There are two types of the control modes of variable power source：Unipolar SPWM modulate and bipolar SPWM modulation, two kinds of control modes there is
Some problems.
Bipolar SPWM is modulated：Two switching tube complementary drives of its same bridge arm, since switching tube conducting, cut-off are special
The inconsistency of property and the control circuit parameter of dead time it is inconsistent, two switching tubes that may cause same bridge arm are same
When turn on, and then switching tube is caused to damage, causes inverter cisco unity malfunction；
Unipolar SPWM is modulated：All only make high frequency switching there are one switching tube in alternating current negative half period, cause the profit of outputting inductance
Declined with rate, thereby reduce the efficiency of inverter power supply；The control mode can cause the electromagnetic interference problem phase at DC ends simultaneously
Work as protrusion, it is impossible to realize Reactive-power control.
The content of the invention]
The technical problem to be solved in the present invention is to provide a kind of simple, efficient, electromagnetic interference the is small single-phase inverters of circuit.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is a kind of single-phase inverter, defeated including direct current
Enter end, ac output end, control circuit, 6 switching tubes, two diodes and two inductance；The hot end of first switch pipe
With the anode of the high potential termination direct-flow input end of second switch pipe；The cold end of 3rd switching tube and the 4th switching tube it is low
Current potential terminates the cathode of direct-flow input end；The low potential of first switch pipe terminates the hot end of the 3rd switching tube, second switch
The cold end of pipe connects the hot end of the 4th switching tube by the 6th switching tube；First inductance is connected on the low electricity of first switch pipe
Between position end and the first end of ac output end, the second inductance be connected on second switch pipe cold end and ac output end the
Between two ends；The cold end of first termination first switch pipe of the 5th switching tube, the anode of second the first diode of termination, the
The cathode of one diode connects the cold end of second switch pipe；The anode of second diode connects the hot end of the 4th switching tube,
Cathode connects the hot end of the 3rd switching tube.
Above-described single-phase inverter, including the first filter capacitor and the second filter capacitor, the first filter capacitor is connected on
Direct-flow input end, direct-flow input end external direct current power supply；Second filter capacitor is connected on ac output end, the external friendship of ac output end
Galvanic electricity source.
Above-described single-phase inverter, control circuit include microcontroller and modulation circuit, and modulation circuit is by microcontroller
The high-frequency pulse signal of device output is with sinusoidal signal modulation into the high frequency trigger signal for the first to the 6th switching tube of driving, institute
The sinusoidal signal stated is identical with the electric voltage frequency of ac output end.
Above-described single-phase inverter, in the positive half cycle of ac output voltage, microcontroller makes the 6th switching tube open-minded,
Second switch pipe, the shut-off of the 3rd switching tube, and make first switch pipe and the 4th the switching tube synchronous switch under high-frequency signal,
5th switching tube and first switch pipe and the 4th switching tube complementary switch；In the negative half period of ac output voltage, microcontroller makes
First switch pipe and the shut-off of the 4th switching tube, and make second switch pipe and the 3rd switching tube the synchro switch work under high-frequency signal
Make, the 5th switch, the opening and closing of the 6th switching tube and second switch pipe and the 3rd switching tube complementary switch.
Above-described single-phase inverter, including following operating mode：
501）In the positive half cycle of ac output voltage, the 6th switching tube is open-minded, and second switch pipe and the 3rd switching tube are closed, and the 5th
Switching tube and first switch pipe, the 4th switching tube high frequency complementary switch；When the high frequency of first switch pipe and the 4th switching tube triggers
When signal is high level, first switch pipe and the conducting of the 4th switching tube, anode, first switch pipe, the first electricity of direct-flow input end
Sense, ac output end, the second inductance, the 6th switching tube, the cathode of the 4th switching tube and direct-flow input end are sequentially connected in series, and form electricity
Flow back to road；When the high frequency trigger signal of first switch pipe and the 4th switching tube is low level, first switch pipe and the 4th switch
Pipe turns off, and the 6th switching tube, the second diode, the first inductance, ac output end and the second inductance are sequentially connected in series, and forms afterflow and returns
Road；
502）In the negative half period of ac output voltage, the 5th switching tube and the 6th switching tube and second switch pipe and the 3rd switching tube
Complementary switch, first switch pipe and the shut-off of the 4th switching tube；When the high frequency trigger signal of second switch pipe and the 3rd switching tube is
During high level, second switch pipe and the conducting of the 3rd switching tube, the 5th switching tube and the 6th switching tube turn off, and direct-flow input end is just
Pole, second switch pipe, the second inductance, ac output end, the first inductance, the cathode of the 3rd switching tube and direct-flow input end are gone here and there successively
It connects, forms current loop；When the high frequency trigger signal of second switch pipe and the 3rd switching tube be low level when, second switch pipe and
3rd switching tube turns off, and the 5th switching tube is open-minded；5th switching tube, the first diode, the second inductance, ac output end and first
Inductance is sequentially connected in series, and forms continuous current circuit.
Above-described single-phase inverter, first switch pipe, second open switching tube, the 3rd switching tube, the 4th switching tube and
6th switching tube includes connecing the low potential of main switch with its main switch and the booster diode that connects, the anode of booster diode respectively
End, the cathode of booster diode connect the hot end of main switch.
Above-described single-phase inverter, when power factor (PF) is less than 1, there are the opposite shapes of alternating voltage and current direction
During state, including following operating mode：
701）In the positive half cycle of ac output voltage, the 6th switching tube opens conducting, second switch pipe and the shut-off of the 3rd switching tube,
5th switching tube and first switch pipe, the 4th switching tube complementation are open-minded；When the high frequency of first switch pipe and the 4th switching tube triggers
When signal is high level, first switch pipe and the 4th switching tube are open-minded；Two pole of body of the cathode of direct-flow input end, the 4th switching tube
Pipe, the body diode of the body diode of the 6th switching tube, the second inductance, ac output end, the first inductance, first switch pipe and straight
The anode of stream input terminal is sequentially connected in series, and forms current loop；When the high frequency trigger signal of first switch pipe and the 4th switching tube is
During low level, first switch pipe and the shut-off of the 4th switching tube；5th switching tube, the first diode, the second inductance, ac output end
It is sequentially connected in series with the first inductance, forms continuous current circuit；
702）In the negative half period of ac output voltage, first switch pipe and the shut-off of the 4th switching tube, the 5th switching tube, the 6th switch
Pipe is open-minded with second switch pipe, the 3rd switching tube complementation；When the high frequency trigger signal of second switch pipe and the 3rd switching tube is height
During level, second switch pipe and the 3rd switching tube are open-minded；The cathode of direct-flow input end, the body diode of the 3rd switching tube, first
Inductance, ac output end, the second inductance, the anode of the body diode of second switch pipe and direct-flow input end are sequentially connected in series, and are formed
Current loop；When the high frequency trigger signal of second switch pipe and the 3rd switching tube is low level, second switch pipe and the 3rd is opened
Close pipe shut-off；6th switching tube, the second diode, the first inductance, ac output end and the second inductance are sequentially connected in series, and form afterflow
Circuit.
The single-phase inverter circuit of the present invention is simple, efficient, electromagnetic interference is small.
[description of the drawings]
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the topological diagram of single-phase inverter of the present invention.
Fig. 2 is the corresponding topological diagram of the first operating mode of single-phase inverter of the present invention.
Fig. 3 is the corresponding topological diagram of the second operating mode of single-phase inverter of the present invention.
Fig. 4 is the corresponding topological diagram of the 3rd operating mode of single-phase inverter of the present invention.
Fig. 5 is the corresponding topological diagram of the 4th operating mode of single-phase inverter of the present invention.
Fig. 6 is the corresponding topological diagram of the 5th operating mode of single-phase inverter of the present invention.
Fig. 7 is the corresponding topological diagram of the 6th operating mode of single-phase inverter of the present invention.
Fig. 8 is the drive waveforms figure of single-phase inverter switching tube of the embodiment of the present invention.
Specific embodiment]
Explanation is elaborated to the specific implementation method of the present invention below；
As shown in Figure 1, single-phase inverter of the present invention include DC power supply Vdc, AC power AC, 6 switching tube S1, S2, S3,
S4, S5, S6, two diodes D1, D2, two filter inductance L1, L2, two capacitances C1, C2 and microcontroller.
The positive and negative both ends of DC power supply Vdc are connected with filter capacitor C1, the current input terminal of switching tube S1 and S2 with
The anode of DC power supply Vdc is connected, the current output terminal of switching tube S1 while input terminal, switching tube S5 with switching tube S3
Input terminal, the cathode of diode D2 and the first end of filter inductance L1 be connected, the current output terminal of switching tube S2 simultaneously with
The first end of the input terminal of switching tube S6, the cathode of diode D1 and filter inductance L2 is connected；The electric current of switching tube S3 and S4
Output terminal is connected with the cathode of DC power supply Vdc, the output terminal of switching tube S6 and the input terminal of switching tube S4, diode D2
Anode be connected；Diode D1 anodes are connected with the output terminal of switching tube S5.Connect between the other end of filter inductance L1 and L2
AC power AC is met, the respective control terminal of switching tube S1, S2, S3, S4, S5, S6 passes through modulation circuit and above-mentioned microcontroller
High-frequency pulse signal output terminal on MCU is connected.
Filter capacitor C1 for reducing inverter link input ripple.DC power supply Vdc generates dress for DC energy
It puts.Modulation circuit is used to sinusoidal signal modulation open the high-frequency pulse signal of microcontroller output into for driving six
Close the high frequency trigger signal of pipe S1, S2, S3, S4, S5, S6；Above-mentioned sinusoidal signal and the AC power on AC power AC
Same frequency, phase can be the same or different.
The control terminal of switching tube S1 and S4 distinguish modulated circuit and the first high-frequency pulse signal of microcontroller is defeated
Outlet is connected, and the control terminal of switching tube S2 and S3 distinguish modulated circuit and the second high-frequency impulse of microcontroller is believed
Number output terminal is connected, and switching tube S5 is connected with the 3rd high-frequency pulse signal output terminal of microcontroller, switching tube S6 with it is micro-
The 4th high-frequency pulse signal output terminal of controller MCU is connected, and switching tube S5 and switching tube S6 can also be microcontroller
The control of same high-frequency pulse signal, by another signal of microcontroller external circuit pressure is controlled to open switching tube S6.
When AC power AC is in positive half cycle, microcontroller makes S6 open-minded, while turns off switching tube S2, S3, and
Switching tube S1, S4 is made to work in high-frequency synchronous lower switch, switching tube S5 and switching tube S1, S4 complementation HF switch；Work as alternating current
When source AC is in negative half period, microcontroller turns off switching tube S1, S4, and switching tube S2, S3 is made to be opened under high-frequency synchronous
Close work, switching tube S5, S6 and S2, S3 complementary switch.
Fig. 2 show the first operating mode, and when AC power AC is in alternating voltage positive half cycle, B points current potential is higher than A points electricity
Position, MCU output signal driving S1, S2, S3, S4, S5 and S6, switching tube S6 is open-minded always, switching tube S2, S3 shut-off；Switching tube
S5 and switching tube S1 and S4 complementary switch, when the high frequency trigger signal of switching tube S1 and S4 are in pwm signal high level,
Switching tube S1 and S4 are turned on, the anode of DC power supply Vdc, switching tube S1, filter inductance L1, output AC power source AC, filtering
Inductance L2, switching tube S6, switching tube S4 and DC power supply Vdc cathode form current loop successively.
Fig. 3 show the second operating mode, and when AC power AC is in alternating voltage positive half cycle, B points current potential is more than A points
During current potential, MCU output signal driving S1, S2, S3, S4, S5, S6, switching tube S6 is open-minded always, switching tube S2, S3 shut-off；When
When the high frequency trigger signal of switching tube S1 and S4 are in pwm signal low level, switching tube S1 and S4 shut-off, switching tube S6,
Diode D2, filter inductance L1, AC power AC and filter inductance L2 form continuous current circuit.
Fig. 4 show the 3rd operating mode, and when AC power AC is in alternating voltage negative half period, A points current potential is more than B points
During current potential, MCU output signals drive S1, S2, S3, S4, S5, S6, and switching tube S1 and S4 are closed, switching tube S5, S6 and switching tube
S1 and S4 complementary outputs；When switching tube S2 and S3 high frequency trigger signal are high level, switching tube S2 and S3 conducting, switch
Pipe S5, S6 are turned off；Anode, switching tube S2, filter inductance L2, AC power AC, filter inductance L1, the switch of DC power supply Vdc
Pipe S3 and DC power supply Vdc cathode form current loop successively.
Fig. 5 show the 4th operating mode, and when AC power AC is in alternating voltage negative half period, A points current potential is more than B points electricity
During position, MCU output signal driving S1, S2, S3, S4, S5, S6, switching tube S1 and S4 are closed；When switching tube S2 and S3 high frequency
When trigger signal is low level, switching tube S2 and S3 are turned off, and switching tube S5 is open-minded；Switching tube S5, diode D1, filter inductance
L2, AC power AC and filter inductance L1 form continuous current circuit.
Above-mentioned four kinds of described operating modes are to be operated in power factor as in the case of 1, when needing to carry out Reactive-power control
When, since AC supply voltage is inconsistent with current phase, exists in AC power alternating voltage positive half cycle or negative half period and hand over
Galvanic electricity presses the situation opposite with alternating current direction, and there are following two operating modes.
Fig. 6 show the 5th operating mode, and when AC power AC is in voltage positive half cycle, B points current potential is higher than A point current potentials
When, MCU output signal driving S1, S2, S3, S4, S5 and S6, switching tube S6 is open-minded always, and switching tube S2 and S3 shut-off are opened
Close pipe S5 and switching tube S1 and S4 complementary switch；When the high frequency trigger signal of switching tube S1 and S4 are in pwm signal high level
When, switching tube S1 and S4 is open-minded, switching tube S5 shut-offs, DC power supply Vdc cathode, the body diode D6 of switching tube S4, switch
Body diode D7, filter inductance L2, AC power AC, filter inductance L1, body diode D3, the direct current of switching tube S1 of pipe S6
The anode of source Vdc forms current loop successively.
When the high frequency trigger signal of switching tube S1 and S4 are in pwm signal low level, switching tube S1 and S4 shut-off,
Switching tube S5 is open-minded, and switching tube S5, diode D1, filter inductance L2, AC power AC and filter inductance L1 form afterflow and return
Road；That is, operating mode four；
Operating mode five replaces switching with pattern four.
Fig. 7 show the 6th operating mode, and when AC power AC is in voltage negative half period, A points current potential is higher than B point current potentials
When, microcontroller output signal driving S1, S2, S3, S4, S5 and S6, switching tube S1, S4 closing, switching tube S2, S3 are with opening
Close pipe S5, S6 complementary switch；When the high frequency trigger signal of switching tube S2 and S3 are in pwm signal high level, switching tube S2
It is open-minded with S3, switching tube S5, S6 shut-off, DC power supply Vdc cathode, the body diode D5 of switching tube S3, filter inductance L1, friendship
Galvanic electricity source AC, filter inductance L2, the body diode D4 of switching tube S2, the anode of DC power supply Vdc form current loop successively.
When the high frequency trigger signal of switching tube S2 and S3 are in pwm signal low level, switching tube S2 and S3 shut-off are opened
It is open-minded to close pipe S5, S6, switching tube S6, diode D2, filter inductance L1, AC power AC and filter inductance L2 form afterflow and return
Road, that is, operating mode two.
Operating mode six replaces switching with pattern two.
Single-phase inverter filter inductance L1, filter inductance L2, filter capacitor C2 form filter circuit, and filter circuit can be adopted
With LC mode filters or LCL type or L-type wave filter.
Switching tube S1, S2, S3, S4 and S6 can be IGBT the IGBT anti-parallel diodes with internal diode,
Can also be MOSFET, switching tube S5 is the IGBT or MOSFET without internal diode.
Compared with prior art, inverter of the invention has the advantages that following several：
1st, circuit topological structure is changed, adding one on a bridge arm wherein opens with conventional half-bridge full-bridge circuit relatively
Guan Guan, and change of current loop is added between bridge arm so that no matter city's net positive half cycle or negative half period are being exchanged, two inductance are simultaneously
Work, while inductance utilization rate is improved, improves electromagnetic interference problem；
2nd, due to the introducing of afterflow loop, the current potential of 2 points of A, B in the figure current potential during afterflow keeps of substantially equal, and
2 potential change amounts of inverter mode and freewheeling state A, B are smaller, this reduces electromagnetic interference problem, while inhibit to leak electricity
The generation of stream；
3rd, four switching tubes that inverter uses all make high frequency switching, and no matter this causes in positive-negative half-cycle, two filter inductances
For the current potential of the interior side terminal of L1, L2 all in high-frequency impulse, outer side terminal is alternating current, improves the utilization of filter inductance
Rate；
4th, continuous current circuit is introduced so that continuous current circuit shortens, and efficiency is improved so as to reduce loss, in alternating current positive-negative half-cycle
High frequency switching will be done there are two switching tube, corresponding switching tube does afterflow with diode, there are one alternating current positive-negative half-cycle meetings
Switching tube pipe participates in energy conversion；
5th, due to the half that the voltage of main switch high frequency conversion is Vdc, the switching loss of main switch reduces, and then is promoted
Overall efficiency.
6th, five and 6 two kind of operating mode, it, can also in the case of making inverter that can both be operated in power factor equal to 1
In the case of Reactive-power control power factor is operated in less than 1, Reactive-power control is realized convenient for dispatching of power netwoks.
Claims (7)
1. a kind of single-phase inverter, including direct-flow input end, ac output end and control circuit, which is characterized in that opened including 6
Guan Guan, two diodes, two inductance；The high potential termination direct current input of the hot end and second switch pipe of first switch pipe
The anode at end；The cathode of the cold end of 3rd switching tube and the low potential termination direct-flow input end of the 4th switching tube；First opens
The low potential for closing pipe terminates the hot end of the 3rd switching tube, and the cold end of second switch pipe connects the 4th by the 6th switching tube
The hot end of switching tube；First inductance is connected between the cold end of first switch pipe and the first end of ac output end, the
Two inductance are connected between the cold end of second switch pipe and the second end of ac output end；First termination the of the 5th switching tube
The cold end of one switching tube, the anode of second the first diode of termination, the cathode of the first diode connect the low of second switch pipe
Potential end；The anode of second diode connects the hot end of the 4th switching tube, and cathode connects the hot end of the 3rd switching tube.
2. single-phase inverter according to claim 1, which is characterized in that including the first filter capacitor and the second filtered electrical
Hold, the first filter capacitor is connected on direct-flow input end, direct-flow input end external direct current power supply；Second filter capacitor is connected on exchange output
End, the external AC power of ac output end.
3. single-phase inverter according to claim 1, which is characterized in that control circuit includes microcontroller and modulation electricity
Road, the high-frequency pulse signal that modulation circuit exports microcontroller is with sinusoidal signal modulation into for the first to the 6th switch of driving
The high frequency trigger signal of pipe, the sinusoidal signal are identical with the electric voltage frequency of ac output end.
4. single-phase inverter according to claim 3, which is characterized in that in the positive half cycle of ac output voltage, microcontroller
Device makes the 6th switching tube open-minded, second switch pipe and the shut-off of the 3rd switching tube, and makes first switch pipe and the 4th switching tube in height
Synchronous switch, the 5th switching tube and first switch pipe and the 4th switching tube complementary switch under frequency signal；In exchange output electricity
The negative half period of pressure, microcontroller turns off first switch pipe and the 4th switching tube, and second switch pipe and the 3rd switching tube is made to exist
Synchronous switch under high-frequency signal, the 5th switch and the 6th switching tube and second switch pipe and the 3rd switching tube complementary switch.
5. single-phase inverter according to claim 4, which is characterized in that including following operating mode：
In the positive half cycle of ac output voltage, the 6th switching tube is open-minded, and second switch pipe and the 3rd switching tube are closed, the 5th switch
Pipe and first switch pipe and the 4th switching tube high frequency complementary switch, when first switch pipe and the high frequency trigger signal of the 4th switching tube
For high level when, first switch pipe and the conducting of the 4th switching tube, the anode of direct-flow input end, first switch pipe, are handed over the first inductance
The cathode for flowing output terminal, the second inductance, the 6th switching tube, the 4th switching tube and direct-flow input end is sequentially connected in series, and is formed electric current and is returned
Road；When the high frequency trigger signal of first switch pipe and the 4th switching tube is low level, first switch pipe and the 4th switching tube close
Disconnected, the 6th switching tube, the second diode, the first inductance, ac output end and the second inductance are sequentially connected in series, and form continuous current circuit；
In the negative half period of alternating voltage output, the 5th switching tube and the 6th switching tube and second switch pipe and the 3rd switching tube are complementary
Switch, first switch pipe and the shut-off of the 4th switching tube；When the high frequency trigger signal of second switch pipe and the 3rd switching tube is high electricity
Usually, second switch pipe and the conducting of the 3rd switching tube, the 5th switching tube and the shut-off of the 6th switching tube, the anode of direct-flow input end,
Second switch pipe, the second inductance, ac output end, the first inductance, the cathode of the 3rd switching tube and direct-flow input end are sequentially connected in series,
Form current loop；When the high frequency trigger signal of second switch pipe and the 3rd switching tube is low level, second switch pipe and the
Three switching tubes turn off, and the 5th switching tube is open-minded；5th switching tube, the first diode, the second inductance, ac output end and the first electricity
Sense is sequentially connected in series, and forms continuous current circuit.
6. single-phase inverter according to claim 4, which is characterized in that first switch pipe, second open switching tube, the 3rd open
Guan Guan, the 4th switching tube and the 6th switching tube include and its main switch and the booster diode that connects, the sun of booster diode respectively
Pole connects the cold end of main switch, and the cathode of booster diode connects the hot end of main switch.
7. single-phase inverter according to claim 6, which is characterized in that when power factor (PF) is less than 1, there are alternating voltages
During opposite with current direction state, including following operating mode：
In the positive half cycle of ac output voltage, the 6th switching tube opens conducting, and second switch pipe and the 3rd switching tube turn off, and the 5th
Switching tube and first switch pipe, the 4th switching tube complementation are open-minded；When first switch pipe and the high frequency trigger signal of the 4th switching tube
For high level when, first switch pipe and the 4th switching tube are open-minded；The cathode of direct-flow input end, the 4th switching tube body diode,
Body diode, the second inductance, ac output end, the first inductance, the body diode and direct current of first switch pipe of 6th switching tube
The anode of input terminal is sequentially connected in series, and forms current loop；When the high frequency trigger signal of first switch pipe and the 4th switching tube is low
During level, first switch pipe and the shut-off of the 4th switching tube；5th switching tube, the first diode, the second inductance, ac output end and
First inductance is sequentially connected in series, and forms continuous current circuit；
In the negative half period of ac output voltage, first switch pipe and the 4th switching tube shut-off, the 5th switching tube, the 6th switching tube with
Second switch pipe, the 3rd switching tube complementation are open-minded；When the high frequency trigger signal of second switch pipe and the 3rd switching tube is high level
When, second switch pipe and the 3rd switching tube are open-minded；The cathode of direct-flow input end, the body diode of the 3rd switching tube, the first inductance,
Ac output end, the second inductance, the anode of the body diode of second switch pipe and direct-flow input end are sequentially connected in series, and are formed electric current and are returned
Road；When the high frequency trigger signal of second switch pipe and the 3rd switching tube is low level, second switch pipe and the 3rd switching tube close
It is disconnected；6th switching tube, the second diode, the first inductance, ac output end and the second inductance are sequentially connected in series, and form continuous current circuit.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199722A (en) * | 2012-01-06 | 2013-07-10 | 苏州欧姆尼克新能源科技有限公司 | Method used for offering reactive compensation to single-phase photovoltaic grid-connected inverter |
| CN103259441A (en) * | 2012-02-16 | 2013-08-21 | 阳光电源股份有限公司 | Inverter power source device |
| CN103312206A (en) * | 2013-07-01 | 2013-09-18 | 台州富凌电气有限公司 | Efficient inverter |
| CN103326605A (en) * | 2013-07-01 | 2013-09-25 | 台州富凌电气有限公司 | High efficient inverter |
| CN103354427A (en) * | 2013-06-24 | 2013-10-16 | 华为技术有限公司 | Single-phase inverter and three-phase inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199722A (en) * | 2012-01-06 | 2013-07-10 | 苏州欧姆尼克新能源科技有限公司 | Method used for offering reactive compensation to single-phase photovoltaic grid-connected inverter |
| CN103259441A (en) * | 2012-02-16 | 2013-08-21 | 阳光电源股份有限公司 | Inverter power source device |
| CN103354427A (en) * | 2013-06-24 | 2013-10-16 | 华为技术有限公司 | Single-phase inverter and three-phase inverter |
| CN103312206A (en) * | 2013-07-01 | 2013-09-18 | 台州富凌电气有限公司 | Efficient inverter |
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