CN107516900A - A kind of harmonic wave extracting method and device based on magnetic unbalance principle - Google Patents
A kind of harmonic wave extracting method and device based on magnetic unbalance principle Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a kind of harmonic wave extracting method and device based on magnetic unbalance principle, including：The system voltage of AC network flows back to system by electric capacity C1 and transformer T1 all the way, another way passes through electric capacity C2, inductance L1, transformer T1 flows back to system, the equivalent capacitance under fundamental voltage is identical with the series loop that C2 and L1 is formed by C1, fundamental flux is cancelled out each other caused by two-way, harmonic flux is sensed transformer T1 secondary side, Unity Power Factor PWM Rectifier Based rectification by secondary side joint is DC voltage, the harmonic wave of specific times can not only be filtered out, the harmonic electric energy extraction and application that script will can also be consumed on damping resistance, the damping resistance active loss of fundamental wave is avoided during application.
Description
Technical field
This power system research field, in particular it relates to a kind of harmonic wave extracting method and dress based on magnetic unbalance principle
Put.
Background technology
Due to the extensive use of Power Electronic Technique, rectification type load quantity, capacity are significantly increased in power network, especially
The load substantial increase of " the flat ripple of the uncontrollable commutation capacitor of diode " circuit topology, causes voltage-type harmonic source accounting increasingly to increase
Greatly, voltage-type harmonic source is adapted to solve using the filter apparatus of cascaded structure, but the structure of existing network load is general not
Permission seals in filter between the harmonic load and power distribution network of high number.Currently mainly use parallel connection type active or passive
LC wave filters are solved, and this method has wave filter overload risk, and resistance must be set in filter branch during application
Damping, just can guarantee that the normal operation of wave filter, consumes heating on damping resistance which results in fundamental current, while also make humorous
Wave power all consumes in vain on damping resistance, wastes a large amount of utilizable active energies.
The content of the invention
The invention provides a kind of harmonic wave extracting method and device based on magnetic unbalance principle, can not only filter out specific time
Several harmonic wave, moreover it is possible to the harmonic electric energy extraction and application that consume script on damping resistance, avoided during application
The damping resistance active loss of fundamental wave.
For achieving the above object, on the one hand the application provides a kind of harmonic wave extraction side based on magnetic unbalance principle
Method, methods described include：
The system voltage output end of AC network and electric capacity C1 and C2 positive pole are all connected with, electric capacity C1 negative pole and transformer
T1 first winding one end connection, the other end with transformer 1T first winding after electric capacity C2 negative pole is connected with inductance L1
Connection, the system voltage input of AC network is connected with the middle part of transformer T1 first winding, transformer T1 it is secondary around
Group is connected with Unity Power Factor PWM Rectifier Based；The system voltage of AC network flows back to by electric capacity C1 and transformer T1 all the way and is
System, another way flow back to system by electric capacity C2, inductance L1, transformer T1, and the series loop that C1 and C2 and L1 are formed is in fundamental wave electricity
Pressure equivalent capacitance capacity is identical, and fundamental flux is cancelled out each other caused by two-way, therefore does not produce 50Hz's in Circuit Fault on Secondary Transformer
Alternating voltage, i.e. system operation do not influence power-frequency voltage operation, when there is harmonic voltage on circuit, now electric capacity C1 and inductance L
Generation resonance, its electric current flowed through are much larger than the electric current for flowing through C2, and two electric currents can not in the magnetic flux that transformer primary side is formed
Cancel out each other, now form induced voltage in Circuit Fault on Secondary Transformer, pass through change-over circuit (rectification circuit and the inversion electricity of secondary side
Road) harmonic conversion is used into alternating voltage or DC voltage for load, so as to realize the extraction to harmonic energy.
Wherein, inductance L1 is nonlinear device.The inductance saturation after harmonic current flowed through is more than setting value, reactance value drop
It is low to make frequency filtering off-resonance frequency, so as to reduce harmonic current automatically, avoiding device overload damage, that is, solve harmonic voltage
Cause wave filter overload problem in source.This circuit structure has also been avoided as much as fundamental wave while ingenious extraction harmonic electric energy
The loss of reactive component, inductance and the capacity cell of all non-power consumptions of complete machine are formed, without using a resistive element, it is clear that its
Active loss can be reduced to very small scope.L1 can be in parallel multigroup with L filter branch, can also use double tunning to filter
Device, principle are identical.
Wherein, change-over circuit includes DC converting circuit and ac conversion circuit (being selected according to burden requirement).Directly
Flow change-over circuit include rectification circuit in diode D1-D4, filter capacitor E1, switching device MOSFET pipe M1, diode D5,
Filter capacitor E2 is formed.Entirely the connected mode of circuit is：Diode D1 negative terminal is connected with D2 anode, and and Harmonic Current
AC one end is connected, and diode D3 negative terminal is connected with D4 anode, and is connected with Harmonic Current AC one end, diode D1 anode
It is connected with D3 anode, diode D2 negative terminal is connected with D4 negative terminal, and filter capacitor E1 positive and negative both ends are connected to diode
Between D3 anode and diode D4 negative terminal, MOSFET pipes M1 D ends and diode D3 anode, the connection of inductance L1 both ends
Between MOSFET pipes M1 S ends and diode D4 negative terminal, diode D5 anodes are connected with MOSFET pipes M1 S ends, filtering
Electric capacity E2 anode is connected with diode D5 negative terminal, and E2 negative terminal is connected with diode D4 negative terminal, the both ends connection of load
In filter capacitor E2 both ends.
Wherein, the amplitude calculation formula of DC voltage：
Wherein, U0For output voltage, D is control signal dutycycle, UinFor input voltage
Wherein, the ac conversion circuit in change-over circuit includes diode D6-D8, the filter capacitor in rectification circuit
E3, inverter circuit are made up of MOSFET pipes M2-M5, inductance L2 and electric capacity E4 composition resonance circuits, by transformer T1 to load
Power supply.Entirely the connected mode of circuit is：Diode D6 negative terminal is connected with D7 anode, and with Harmonic Current AC one end phase
Even, diode D8 negative terminal is connected with D9 anode, and is connected with Harmonic Current AC one end, and diode D6 anode and D8 are just
End is connected, and diode D7 negative terminal is connected with D9 negative terminal, and filter capacitor E3 positive and negative both ends are connected to diode D8 anode
Between diode D9 negative terminal, MOSFET pipes M2 D ends are connected with filter capacitor E3 positive pole, MOSFET pipes M2 S ends and
MOSFET pipes M3 D ends are connected, and MOSFET pipes M3 S ends are connected with filter capacitor E2 negative terminal, MOSFET pipes M4 D ends with
Filter capacitor E3 positive pole is connected, and MOSFET pipes M4 S ends are connected with MOSFET pipes M5 D ends, MOSFET pipes M5 S ends and
Filter capacitor E2 negative terminal is connected, and inductance L2 one end is connected with MOSFET pipes M2 S ends, and the one of the other end and resonant capacitance E4
End is connected, and the other end of resonant capacitance is connected with one end of transformer T2 first windings, transformer the T2 other end and MOSFET
Pipe M5 D ends are connected, and the both ends of load are connected to the both ends of transformer T2 secondary windings.
On the other hand, present invention also provides a kind of harmonic extractor based on magnetic unbalance principle, described device bag
Include：
Electric capacity C1, electric capacity C2, inductance L1, transformer T1, Unity Power Factor PWM Rectifier Based；The wherein system electricity of AC network
Pressure output end and electric capacity C1 and C2 positive pole are all connected with, and electric capacity C1 negative pole is connected with transformer T1 first winding one end, electricity
The negative pole for holding C2 is connected with after inductance L1 series connection with the other end of transformer 1T first winding, and the system voltage of AC network is defeated
Enter end to be connected with the middle part of transformer T1 first winding, transformer T1 secondary winding and Unity Power Factor PWM Rectifier Based connect
Connect；The system voltage of AC network flows back to system by electric capacity C1 and transformer T1 all the way, and another way passes through electric capacity C2, inductance
L1, transformer T1 flow back to system, and the equivalent capacitance under fundamental voltage is identical with the series loop that C2 and L1 is formed by C1, two-way
Caused fundamental flux is cancelled out each other, therefore does not produce 50Hz alternating voltage in Circuit Fault on Secondary Transformer, i.e. system operation does not influence
Power-frequency voltage is run, and when there is harmonic voltage on circuit, now resonance occurs for electric capacity C1 and inductance L, and the electric current that it flows through is long-range
In the electric current for flowing through C2, two electric currents can not cancel out each other in the magnetic flux that transformer primary side is formed, now in transformer secondary
Side forms induced voltage, and harmonic wave can be converted into alternating current by the change-over circuit (rectification circuit and inverter circuit) of secondary side
Pressure or DC voltage use for load, so as to realize the extraction to harmonic energy.
One or more technical schemes that the application provides, have at least the following technical effects or advantages：
Method and apparatus in the application are carried out rectification and inversion obtain phase by the extraction to system harmonicses component
The direct current the answered load different with supply is exchanged, it can be seen that, the apparatus and method can not only filter out the harmonic wave of specific times, also
The harmonic electric energy extraction and application that script will can be consumed on damping resistance, while the apparatus and method are come for 50Hz fundamental waves
Say and be equivalent to capacitor, also provided while harmonic wave is filtered for system idle, open a kind of regeneration harmonic electric energy
New technology, in addition the apparatus and method damping resistance active loss of fundamental wave is avoided during application, that is, solve filter
Except big, uneconomic problem is lost in harmonic voltage source, in energy-saving and emission-reduction today that the situation is tense, the technical scheme of the application has
Preferable social benefit and economic value.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form the restriction to the embodiment of the present invention；
Fig. 1 a are the typical circuit schematic diagrames of the harmonic extractor based on magnetic unbalance principle in the application；
Fig. 1 b are the typical circuit schematic diagrames of the harmonic extractor based on magnetic unbalance principle in the application；
Fig. 2 is harmonic wave energy extraction element simulation model schematic diagram in the application；
Fig. 3 is boost-buck circuit theory schematic diagrams in the application；
Fig. 4 is ac conversion circuit schematic diagram in the application.
Embodiment
The invention provides a kind of harmonic wave extracting method and device based on magnetic unbalance principle, can not only filter out specific time
Several harmonic wave, moreover it is possible to the harmonic electric energy extraction and application that consume script on damping resistance, avoided during application
The damping resistance active loss of fundamental wave.
It is below in conjunction with the accompanying drawings and specific real in order to be more clearly understood that the above objects, features and advantages of the present invention
Mode is applied the present invention is further described in detail.It should be noted that in the case where not conflicting mutually, the application's
Feature in embodiment and embodiment can be mutually combined.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be implemented using other different from the other modes in the range of being described herein, therefore, protection scope of the present invention is not by under
The limitation of specific embodiment disclosed in face.
Exemplary circuit configuration (phase) is a kind of derivative schemes based on Passive LC filtering technique as shown in figure 1 a-b, is handed over
The system voltage of stream power network flows back to system by reactive-load compensation capacitor C1/C2, L and transformer T first winding respectively,
C1 and the series loop that C2, L the are formed equivalent capacitance under fundamental voltage are identical, transformer T first winding Same Name of Ends point
It is not connected with two capacitive branch, two winding numbers of ampere turns are identical, except that being also in series with resonant inductor in C1 branch roads
L, L and C1 are in specific times harmonic frequency series resonance, and so, the electric current for flowing through transformer T first windings is divided into two groups, and one
Group is the reactive current (C1 branch roads) containing harmonic wave, another group of reactive current (C2 branch roads) for being free from harmonic wave, due to two
The fundamental reactive current of capacitor is identical, and two first winding numbers of ampere turns are also identical, therefore caused fundamental flux is identical supports
Disappear, and harmonic flux can not be offset, and be sensed transformer T secondary side, will be humorous by the change-over circuit connect of secondary side joint
Wave voltage is converted into DC voltage and alternating voltage and used for load, completes the extraction conversion of harmonic electric energy.
The inductance L used in this project is nonlinear device, and inductance is satisfied after the harmonic current flowed through is more than setting value
With, reactance value, which reduces, makes frequency filtering off-resonance frequency, so that harmonic current is reduced automatically, avoiding device overload damage, i.e., and
Solve harmonic voltage source and cause wave filter overload problem.This circuit structure while ingenious extraction harmonic electric energy also as far as possible
Ground avoids the loss of fundamental reactive component, and inductance and the capacity cell of all non-power consumptions of complete machine are formed, without using an electricity
Resistance element, it is clear that its active loss can be reduced to very small scope.L1 can be in parallel multigroup with L filter branch, can also adopt
It is identical with double-tuned filter, principle.
Feasibility analysis：
Simple simulation model such as Fig. 2, it is alternate that harmonic wave energy extraction element is connected on 10KV power networks, transformation identical per phase structure
The no-load voltage ratio of device is 300/30, and the leakage reactance of each winding is identical, and C1/C2 capacitive reactances are essentially identical, filters out 5 subharmonic, and harmonic wave is electric in power network
Potential source voltage accounting is 2% (200V), it is seen that device only just corresponds to 1.8MVar reactive-load compensation capacitor for system
(and can adjust C, L size with reactive requirement situation, change compensation capacity), impedance for harmonic wave is born depending on secondary side direct current
The size (specifically how to utilize and consider in next step scheme) of load, fundamental wave loss are ignored substantially, it is seen that its filter effect is dashed forward
Go out, adverse effect will not be brought to system.
DC circuit designs：
In order that harmonic energy can be designed change-over circuit, used in the design process for DC load
BOOST-BUCK circuits realize the adjustment to DC voltage, and whole DC converting circuit is as shown in Figure 3.
Its operation principle is：First with the rectification circuit that D1-D4 and E1 is formed by ac voltage rectifier into direct current, then
The boost-buck circuits formed using MOSFET pipes M1, inductance L1, fast recovery diode D5, electric capacity E2, pass through control
The turn-on and turn-off of MOSFET pipes form corresponding DC voltage in load end, and the amplitude calculation formula of DC voltage is as follows：
Exchange designing circuitry：
In order that harmonic energy can be designed change-over circuit, used in the design process for AC load
SPWM inverter circuits realize that by converting direct-current voltage into alternating-current voltage whole change-over circuit is as shown in Figure 4.
Its operation principle is：First with the rectification circuit that D6-D7 and E3 is formed by ac voltage rectifier into direct current, then
The inverter circuit formed using MOSFET pipes M2-M5, controlled by SPWM by converting direct-current voltage into alternating-current voltage, pass through electricity
Feel L2 and E4 resonance, and corresponding alternating voltage is converted into by transformer T2, altogether subsequent communication load.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (10)
1. a kind of harmonic wave extracting method based on magnetic unbalance principle, it is characterised in that methods described includes：
The system voltage output end of AC network and electric capacity C1 and C2 positive pole are all connected with, and electric capacity C2 negative pole is with transformer T1's
First winding one end is connected, and electric capacity C1 negative pole is connected with after inductance L1 series connection with the other end of transformer T1 first winding,
The system voltage input of AC network is connected with the middle part of transformer T1 first winding, transformer T1 secondary winding and list
Position power factor rectifier connection；The system voltage of AC network flows back to system by electric capacity C2 and transformer T1 all the way, another
System is flowed back in road by electric capacity C1, inductance L1, transformer T1, and the series loop that C1 and C2 and L1 are formed is equivalent under fundamental voltage
Capacitance is identical；When there is harmonic voltage on circuit, harmonic conversion is struck a bargain by the change-over circuit of transformer T1 secondary sides
Voltage or DC voltage is flowed to use for load.
2. the harmonic wave extracting method according to claim 1 based on magnetic unbalance principle, it is characterised in that inductance L1 is non-
Linear unit.
3. the harmonic wave extracting method according to claim 1 based on magnetic unbalance principle, it is characterised in that change-over circuit bag
Containing DC converting circuit and ac conversion circuit, DC converting circuit includes：Diode D1-D4, filter capacitor E1, switching device
MOSFET pipes M1, diode D5, filter capacitor E2；Wherein, diode D1 negative terminal is connected with D2 anode, and and Harmonic Current
AC one end is connected, and diode D3 negative terminal is connected with D4 anode, and is connected with Harmonic Current AC one end, diode D1 anode
It is connected with D3 anode, diode D2 negative terminal is connected with D4 negative terminal, and filter capacitor E1 positive and negative both ends are connected to diode
Between D3 anode and diode D4 negative terminal, MOSFET pipes M1 D ends and diode D3 anode, inductance L1 both ends are connected to
Between MOSFET pipes M1 S ends and diode D4 negative terminal, diode D5 anodes are connected with MOSFET pipes M1 S ends, filtered electrical
The anode for holding E2 is connected with diode D5 negative terminal, and E2 negative terminal is connected with diode D4 negative terminal, and the both ends of load are connected to
Filter capacitor E2 both ends.
4. the harmonic wave extracting method according to claim 3 based on magnetic unbalance principle, it is characterised in that DC voltage
Amplitude calculation formula：
<mrow>
<msub>
<mi>U</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<msub>
<mi>U</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
<mfrac>
<mi>D</mi>
<mrow>
<mn>1</mn>
<mo>-</mo>
<mi>D</mi>
</mrow>
</mfrac>
</mrow>
Wherein, U0For output voltage, D is the dutycycle of control pulse, UinFor input voltage.
5. the harmonic wave extracting method according to claim 1 based on magnetic unbalance principle, it is characterised in that in change-over circuit
Ac conversion circuit include：Diode D6-D8, filter capacitor E3, inverter circuit are made up of MOSFET pipes M2-M5, inductance L2
Resonance circuit is formed with electric capacity E4, is powered to the load by transformer T1, wherein, diode D6 negative terminal and D7 anode phase
Even, and be connected with Harmonic Current AC one end, diode D8 negative terminal is connected with D9 anode, and with Harmonic Current AC one end phase
Even, diode D6 anode is connected with D8 anode, and diode D7 negative terminal is connected with D9 negative terminal, and filter capacitor E3's is positive and negative
Both ends are connected between diode D8 anode and diode D9 negative terminal, and MOSFET pipes M2 D ends and filter capacitor E3 are just
Extremely it is connected, MOSFET pipes M2 S ends are connected with MOSFET pipes M3 D ends, MOSFET pipes M3 S ends and filter capacitor E2 negative terminal
It is connected, MOSFET pipes M4 D ends are connected with filter capacitor E3 positive pole, MOSFET pipes M4 S ends and MOSFET pipes M5 D ends phase
Even, MOSFET pipes M5 S ends are connected with filter capacitor E2 negative terminal, and inductance L2 one end is connected with MOSFET pipes M2 S ends, separately
One end is connected with resonant capacitance E4 one end, and the other end of resonant capacitance is connected with one end of transformer T2 first windings, transformation
The device T2 other end is connected with MOSFET pipes M5 D ends, and the both ends of load are connected to the both ends of transformer T2 secondary windings.
6. a kind of harmonic extractor based on magnetic unbalance principle, it is characterised in that described device includes：
Electric capacity C1, electric capacity C2, inductance L1, transformer T1, change-over circuit；Wherein, the system voltage output end of AC network and electricity
Hold C1 and C2 positive pole be all connected with, electric capacity C2 negative pole is connected with transformer T1 first winding one end, electric capacity C1 negative pole and
It is connected after inductance L1 series connection with the other end of transformer 1T first winding, the system voltage input and transformer of AC network
The middle part connection of T1 first winding, transformer T1 secondary winding and change-over circuit；The system voltage a-road-through of AC network
Cross electric capacity C2 and transformer T1 and flow back to system, another way flows back to system by electric capacity C1, inductance L1, transformer T1, C1 and C2 and
The series loop of L1 compositions equivalent capacitance under fundamental voltage is identical, when there is harmonic voltage on circuit, passes through transformer
The change-over circuit of T1 secondary sides uses harmonic conversion into alternating voltage or DC voltage for load.
7. the harmonic extractor according to claim 6 based on magnetic unbalance principle, it is characterised in that inductance L1 is non-
Linear unit.
8. the harmonic extractor according to claim 6 based on magnetic unbalance principle, it is characterised in that change-over circuit bag
Containing DC converting circuit and ac conversion circuit；DC converting circuit includes：Diode D1-D4, filter capacitor E1, switching device
MOSFET pipes M1, diode D5, filter capacitor E2；Diode D1 negative terminal is connected with D2 anode, and with Harmonic Current AC mono-
End is connected, and diode D3 negative terminal is connected with D4 anode, and is connected with Harmonic Current AC one end, diode D1 anode and D3
Anode be connected, diode D2 negative terminal is connected with D4 negative terminal, and filter capacitor E1 positive and negative both ends are connected to diode D3's
Between anode and diode D4 negative terminal, MOSFET pipes M1 D ends and diode D3 anode, inductance L1 both ends are connected to
Between MOSFET pipes M1 S ends and diode D4 negative terminal, diode D5 anodes are connected with MOSFET pipes M1 S ends, filtered electrical
The anode for holding E2 is connected with diode D5 negative terminal, and E2 negative terminal is connected with diode D4 negative terminal, and the both ends of load are connected to
Filter capacitor E2 both ends.
9. the harmonic extractor according to claim 8 based on magnetic unbalance principle, it is characterised in that DC voltage
Amplitude calculation formula：
<mrow>
<msub>
<mi>U</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<msub>
<mi>U</mi>
<mrow>
<mi>i</mi>
<mi>n</mi>
</mrow>
</msub>
<mfrac>
<mi>D</mi>
<mrow>
<mn>1</mn>
<mo>-</mo>
<mi>D</mi>
</mrow>
</mfrac>
</mrow>
Wherein, U0For output voltage, D is the dutycycle of control signal, UinFor input voltage.
10. the harmonic wave extracting method according to claim 6 based on magnetic unbalance principle, it is characterised in that change-over circuit
In ac conversion circuit include：Diode D6-D8, filter capacitor E3 in rectification circuit, inverter circuit is by MOSFET pipes M2-
M5 is formed, and inductance L2 and electric capacity E4 composition resonance circuits, is powered to the load by transformer T1；Diode D6 negative terminal and D7's
Anode is connected, and is connected with Harmonic Current AC one end, and diode D8 negative terminal is connected with D9 anode, and with Harmonic Current AC mono-
End is connected, and diode D6 anode is connected with D8 anode, and diode D7 negative terminal is connected with D9 negative terminal, filter capacitor E3's
Positive and negative both ends are connected between diode D8 anode and diode D9 negative terminal, MOSFET pipes M2 D ends and filter capacitor E3
Positive pole be connected, MOSFET pipes M2 S ends are connected with MOSFET pipes M3 D ends, MOSFET pipes M3 S ends and filter capacitor E2's
Negative terminal is connected, and MOSFET pipes M4 D ends are connected with filter capacitor E3 positive pole, MOSFET pipes M4 S ends and MOSFET pipes M5 D
End is connected, and MOSFET pipes M5 S ends are connected with filter capacitor E2 negative terminal, inductance L2 one end and MOSFET pipes M2 S ends phase
Even, the other end is connected with resonant capacitance E4 one end, and the other end of resonant capacitance is connected with one end of transformer T2 first windings,
The transformer T2 other end is connected with MOSFET pipes M5 D ends, and the both ends of load are connected to the both ends of transformer T2 secondary windings.
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| CN201710786078.4A CN107516900B (en) | 2017-09-04 | 2017-09-04 | Harmonic extraction method and device based on magnetic unbalance principle |
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| CN201710786078.4A CN107516900B (en) | 2017-09-04 | 2017-09-04 | Harmonic extraction method and device based on magnetic unbalance principle |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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