CN202444440U - Bridgeless inverter circuit and solar bridgeless inverter - Google Patents
Bridgeless inverter circuit and solar bridgeless inverter Download PDFInfo
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- CN202444440U CN202444440U CN2012200666748U CN201220066674U CN202444440U CN 202444440 U CN202444440 U CN 202444440U CN 2012200666748 U CN2012200666748 U CN 2012200666748U CN 201220066674 U CN201220066674 U CN 201220066674U CN 202444440 U CN202444440 U CN 202444440U
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Abstract
The utility model discloses a bridgeless inverter circuit and a solar bridgeless inverter, wherein the bridgeless inverter circuit comprises a power collection device, a power grid, a digital signal processor (DSP), and a plurality of DC (direct current)/DC converters which are in multiphase parallel connection or multiphase staggering parallel connection, wherein the input ends of the DC/DC converters are respectively connected with the output end of the power collection device, the control ends of the DC/DC converters are respectively connected with the DSP, and the output ends of the DC/DC converters are respectively connected with the output end of the grid, under the control of DSP, the DC/DC converters work within a preset power frequency period in a time division way, and the obtained positive half sine-wave voltage and negative half sine-wave voltage are added together, so standard sine-wave voltage is obtained. The bridgeless inverter circuit and the solar bridgeless inverter can overcome the defects of large loss, low power utilization rate, more heat treatment elements, large equipment weight, high transportation cost and the like in the prior art, and realize the advantages of small loss, high power utilization rate, less heat treatment elements, small equipment weight and low transportation cost.
Description
Technical field
The utility model relates to electronic device, and particularly, relating to a kind of no bridge inverter circuit and solar energy does not have bridge inverter.
Background technology
Further anxiety along with the energy; Green energy resource obtains the concern of more and more national; Typical wind energy and this type of solar energy renewable energy system are also more by large-scale application, and in order to improve utilization efficiency of energy, the conversion of this type energy all can be used the DC/AC inverter usually; The green energy resource of collecting is fed back to electrical network, do distributed power generation and use.Its typical power generation system structure is as shown in Figure 1.
In distributed generation system shown in Figure 1; Power collecting device is the generator that blade drives for wind energy; And for solar energy, be exactly solar cell panel assembly, they convert green energy resource into electric energy; But this electric energy also need offer electrical network or use to household electrical appliances, therefore needs power conversion.DC/DC converter among Fig. 1, the electric energy of at first power collecting device being collected convert a stable direct current output electricity into, through the DC/AC inverter, are the AC alternating current with this dc inverter again, and the electrical network that is incorporated into the power networks at last is for the load in the electrical network provides energy.For the wind power generation plant in modern times, generally also have an AC/DC rectification stage, be placed on DC/DC converter front.Because electrical network is the industrial-frequency alternating current of low frequency, the structure of above typical distributed electricity generation system can be divided into two kinds of structures as shown in Figures 2 and 3 again.
The distributed generation system of high frequency carrier shown in Figure 2; Be widely used in the powerful distributed generation system; More powerful DC/DC converter of main employing is a galvanic current with the power conversion of power collecting device, and the DC/AC inverter that switches through high frequency again is converted into alternating current with direct current, is the network operation frequency and include a main carrier in the frequency that this high frequency switches; Afterwards through simple filtering; With the high frequency ripple filtering, just can obtain cleaner electrical network industrial-frequency alternating current, generate electricity by way of merging two or more grid systems again.The advantage of this method is to come the Unified Treatment energy with a powerful converter; The discrete component that uses is few, and the cost of electricity-generating of unit power is relatively low, and the inverter of high frequency carrier can use powerful crystal module to realize; Only need do some Drive and Control Circuit gets final product; Yet this method can not be optimized the energy output of power collecting device, in simple terms, and in order to obtain powerful output; Most power collecting devices can select series connection to improve voltage, and parallel connection increases power output with the mode that improves electric current.
But no matter connect still parallel connection; In case cascade collection of energy module together has a job undesiredly maybe can't export rated power; Will influence other modules synchronously, reduce power output together, thereby reduce total energy output; From the angle of utilizing of energy, the energy utilization efficiency of this method is not high.In order to reduce this influence as far as possible, in the middle of reality, the addressing in large-sized solar power station there is harsh requirement, every solar energy electroplax operating state in the installation in the assurance system as far as possible is consistent.Not only this is difficult to realize the also extra construction cost that increases system in reality.
Accurate DC/DC converter shown in Figure 3 adds the distributed generation system that power frequency is switched the DC/AC inverter, just is being widely used in the TRT based on middle low power.DC/DC converter in this system is an accurate DC/DC converter; It uses Sine Wave Pulse Width Modulation will be converted into the quasi-sine-wave output of twice electrical network power frequency from the electric energy that power collecting device obtains; The DC/AC inverter that is connected to then is as long as switch according to power frequency, the quasi-sine-wave of this twice electrical network power frequency switched to power frequency sine wave be connected to the grid and get final product.The advantage of this method is that the whole generating system has been divided into a plurality of generating junior units, and each junior unit has independently that inverter is incorporated into the power networks.Like this, the operating state of each junior unit can independent regulation in reality, thereby is optimized.The fault of a unit can not influence other parts in the system.And the shortcoming of this scheme is because the power that inverter is handled in each unit is less, and distributed power generation needs more converter apparatus, and the method that focuses on that cost is shown in Figure 2 relatively is higher.
Above-mentioned no matter Fig. 2 still is in the distributed generation system shown in Figure 3, has all comprised the inverter of DC/AC, and it mainly is to form with the crystal switch of full bridge structure, basic inverter bridge as shown in Figure 4.
Switch among Fig. 4
,
,
and
; Can be MOSFET (metal-oxide layer-semiconductor-field-effect transistor); Also can be SCR (silicon controlled rectifier); It can also be IGBT controlled or half control silicon crystal elements such as (insulated gate bipolar transistors); Its significant feature is exactly to do switching according to the rule of Fig. 2 or Fig. 3; Direct current or quasi-sine-wave are transformed into standard sine wave, send into electrical network then.The rear end of the basic inverter bridge among Fig. 4 also should comprise filter circuit in principle, only does the principle explanation here, just introduces no longer in detail.
In addition, Fig. 8 is that a typical A ctive Clamp Flyback (using active-clamp instead to swash) circuit combines traditional inverter bridge to realize the circuit diagram that inversion solar cell energy generates electricity by way of merging two or more grid systems.In Fig. 8;
is input filter capacitor;
is the active switch of Active Clamp Flyback;
is clamp switch;
and
is respectively that the parasitic body diode of two active switches also can be extra diode connected in parallel;
is clamping capacitance;
is the output rectifier diode;
is output filter capacitor;
,
,
,
switch can be MOSFET (metal-oxide layer-semiconductors-field-effect transistor); Also can be SCR (silicon controlled rectifier); Can also be IGBT controlled or half control silicon crystal elements such as (insulated gate bipolar transistors),
be the load of grid side.This circuit is exactly the typical inverter that connects according to structure chart shown in Figure 3, and Fig. 8 can be realized inverter output electrical network power frequency sine wave according to the modulation of the modulation of PWM shown in Fig. 9 principle.
As previously mentioned, because the existence of inverter bridge, the load or the output current that is incorporated into the power networks can flow through inverter bridge; Produce loss immediately; Reduce the efficient of inverter, and the crystal switch of inverter be because the existence of loss also can produce heat, inverter also needs extra consideration to dispel the heat like this.Not only increase circuit cost, also can increase volume.
In realizing the process of the utility model, the inventor finds to exist at least in the prior art that loss is big, capacity usage ratio is low, the heat treatment element is many, weight of equipment greatly and defective such as cost of transportation height.
The utility model content
The purpose of the utility model is, to the problems referred to above, proposes a kind of no bridge inverter circuit, to realize that loss is little, capacity usage ratio is high, the heat treatment element is few, weight of equipment is little and the low advantage of cost of transportation.
For realizing above-mentioned purpose; The technical scheme that the utility model adopts is: a kind of no bridge inverter circuit; Comprise power collecting device, electrical network, DSP (digital signal processor); And input connects power collecting device output, control end respectively and connects DSP and output get access to grid the respectively Multiphase Parallel of output or a plurality of accurate DC/DC converter of heterogeneous crisscross parallel respectively, wherein:
Said DSP; Be used for transmitting control signal to a plurality of accurate DC/DC converter of Multiphase Parallel or heterogeneous crisscross parallel; Make a plurality of accurate DC/DC converter time-sharing work in a preset power frequency period of Multiphase Parallel or heterogeneous crisscross parallel; And half quasi-sine-wave voltage of time-sharing work gained forward and half quasi-sine-wave voltage of negative sense spliced, obtain the standard sine wave voltage;
The a plurality of accurate DC/DC converter of said Multiphase Parallel or heterogeneous crisscross parallel is used for respectively converting the electric energy of said power collecting device into half quasi-sine-wave output; And, be used for control signal based on DSP, time-sharing work in a preset power frequency period, alternative expression provides quasi-sine-wave voltage half to electrical network, the standard sine wave voltage that electrical network is obtained.
Further, a plurality of accurate DC/DC converter of said Multiphase Parallel or heterogeneous crisscross parallel comprises the two first accurate DC/DC converter and the second accurate DC/DC converters that are in parallel;
Under the control of said DSP, the first accurate DC/DC converter and the second accurate DC/DC converter are used for time-sharing work in a power frequency period respectively, convert the electric energy of power collecting device into half quasi-sine-wave output; And, in whole power frequency period, half quasi-sine-wave of gained is spliced, make electrical network obtain to constitute and be used for the standard sine wave voltage of supply load by half quasi-sine-wave of forward and half quasi-sine-wave of negative sense;
In whole power frequency period, when the said first accurate DC/DC converter was worked, the second accurate DC/DC converter quit work; When the second accurate DC/DC converter was worked, the first accurate DC/DC converter quit work.
Simultaneously; Based on above-described no bridge inverter circuit; Another technical scheme that the utility model adopts is: a kind of solar energy does not have bridge inverter; Comprise the power collecting device that constitutes by direct-current input power supplying and the input filter capacitor
that is connected in parallel on said direct-current input power supplying output; Electrical network
and grid side load
; DSP; And input connect respectively that direct-current input power supplying output, control end meet DSP respectively and output gets access to grid respectively
Multiphase Parallel of output or a plurality of accurate DC/DC converter of heterogeneous crisscross parallel, wherein:
Said DSP; Be used for transmitting control signal to a plurality of accurate DC/DC converter of Multiphase Parallel or heterogeneous crisscross parallel; Make a plurality of accurate DC/DC converter time-sharing work in a preset power frequency period of Multiphase Parallel or heterogeneous crisscross parallel; And half quasi-sine-wave voltage of time-sharing work gained forward and half quasi-sine-wave voltage of negative sense spliced, obtain the standard sine wave voltage;
The a plurality of accurate DC/DC converter of said Multiphase Parallel or heterogeneous crisscross parallel is used for respectively converting the electric energy of said power collecting device into half quasi-sine-wave output; And, be used for control signal based on DSP, time-sharing work in a preset power frequency period, alternative expression provides quasi-sine-wave voltage half to electrical network, the standard sine wave voltage that electrical network is obtained.
Further, a plurality of accurate DC/DC converter of said Multiphase Parallel or heterogeneous crisscross parallel comprises the two first accurate DC/DC converter and the second accurate DC/DC converters that are in parallel;
Under the control of said DSP, the first accurate DC/DC converter and the second accurate DC/DC converter are used for time-sharing work in a power frequency period respectively, convert the electric energy of power collecting device into half quasi-sine-wave output; And, in whole power frequency period, half quasi-sine-wave of gained is spliced, make electrical network obtain to constitute and be used for the standard sine wave voltage of supply load by half quasi-sine-wave of forward and half quasi-sine-wave of negative sense;
In whole power frequency period, when the said first accurate DC/DC converter was worked, the second accurate DC/DC converter quit work; When the second accurate DC/DC converter was worked, the first accurate DC/DC converter quit work.
Further; In a plurality of accurate DC/DC converter of said Multiphase Parallel or heterogeneous crisscross parallel; Each accurate DC/DC converter comprises the DC/DC translation circuit of SPWM modulation, and the control switch
that is connected with the DC/DC translation circuit of said SPWM (Sine Wave Pulse Width Modulation) modulation;
Said control switch
; Be used for control signal, the work of DC/DC translation circuit or the out-of-work control switch
of control SPWM modulation based on DSP; N is a natural number.
Further; The DC/DC translation circuit of said SPWM modulation; Comprise active inverse-excitation converting circuit, buck conversion Buck circuit, boost booster circuit, at least a in buck or boost buck-boost circuit and the list/biswitch positive activation type Forward DC transfer circuit.
Further; Said active inverse-excitation converting circuit comprises clamping capacitance
; Transformer
; Power semiconductor switch
and
;
body diode or extra parallel diode
and
with
; Output filter capacitor
, and transformer
secondary rectifier diode
; Wherein:
The positive pole of said direct-current input power supplying is connected with the top of transformer
primary coil; Behind clamping capacitance
, the negative electrode of the drain electrode of power semiconductor switch
and the body diode of
or extra parallel diode
connects; The negative pole of said direct-current input power supplying is connected with the anode of the body diode of the source electrode of power semiconductor switch
and
or extra parallel diode
;
The end of said transformer
primary coil is connected with the negative electrode of the body diode of the drain electrode of the anode of the body diode of the source electrode of power semiconductor switch
,
or extra parallel diode
, power semiconductor switch
and
or extra parallel diode
;
The end of said transformer
secondary coil is connected with the anode of transformer
secondary rectifier diode
; The negative electrode of transformer
secondary rectifier diode
is an output; Behind output filter capacitor
, connect the top and the reference ground of transformer
secondary coil;
The grid of said power semiconductor switch
is used for the pulse signal of input duty cycle for
; The grid of power semiconductor switch
is used for the pulse signal of input duty cycle for
; The control end of control switch
is connected with DSP.
Further, said control switch
is connected in parallel on the two ends of transformer
secondary rectifier diode
.
Further, said direct-current input power supplying is energy storage device or wind energy generating plant or the light heat generator that comprises solar panel PV or storage battery at least;
Said power semiconductor switch
and
comprise at least a in MOS memory MOSFET, insulated gate bipolar transistor npn npn IGBT and the diode at least.
Further; Said buck conversion Buck circuit comprises power semiconductor switch
; The body diode of
or extra parallel diode
; Output filter capacitor
; Rectifier diode
, and resonant inductance
; Wherein:
The positive pole of said direct-current input power supplying is connected with the negative electrode of the body diode of the drain electrode of power semiconductor switch
and
or extra parallel diode
; The negative pole of said direct-current input power supplying is connected with the anode of rectifier diode
and with reference to ground;
Said power semiconductor switch power semiconductor switch
body diode or the anode of extra parallel diode
and the negative electrode of rectifier diode
of source electrode,
connect; Behind resonant inductance
and output filter capacitor
, connect with reference to ground, and behind control switch
ground connection;
The grid of said power semiconductor switch
is used for the pulse signal of input duty cycle for
; The control end of control switch
is connected with DSP.
No bridge inverter circuit and the solar energy of each embodiment of the utility model do not have bridge inverter; Because this no bridge inverter circuit comprises power collecting device; Electrical network, DSP, and input connects power collecting device output, control end respectively and connects DSP and output get access to grid the respectively Multiphase Parallel of output or a plurality of accurate DC/DC converter of heterogeneous crisscross parallel respectively; Under the control of DSP; These a plurality of accurate DC/DC converters are time-sharing work in a preset power frequency period, and half quasi-sine-wave voltage of gained forward and half quasi-sine-wave voltage of negative sense are spliced, and obtains the standard sine wave voltage; The scheme that can original DC/DC be added DC/AC is reduced to one-level, directly uses SPWM modulation and DSP to realize alternating current output, raises the efficiency, and reduces the quantity of components and parts, reduces cost simultaneously; Loss is big in the prior art, capacity usage ratio is low, the heat treatment element is many, weight of equipment big and the high defective of cost of transportation thereby can overcome, to realize that loss is little, capacity usage ratio is high, the heat treatment element is few, weight of equipment is little and the low advantage of cost of transportation.
Further feature of the utility model and advantage will be set forth in specification subsequently, and, partly from specification, become obvious, perhaps understand through implementing the utility model.The purpose of the utility model can realize through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtain with other advantages.
Through accompanying drawing and embodiment, the technical scheme of the utility model is done further detailed description below.
Description of drawings
Accompanying drawing is used to provide the further understanding to the utility model, and constitutes the part of specification, is used to explain the utility model with the embodiment of the utility model, does not constitute the restriction to the utility model.In the accompanying drawings:
Fig. 1 is the electrical principle sketch map of exemplary distribution formula electricity generation system;
Fig. 2 is the electrical principle sketch map of the distributed generation system of high frequency carrier;
Fig. 3 DC/DC converter that is as the criterion adds the electrical principle sketch map that power frequency is switched the distributed generation system of DC/AC inverter;
Fig. 4 is the electrical principle sketch map of basic inverter bridge;
Fig. 5 does not have the electrical principle sketch map of bridge inverter circuit for the utility model;
Fig. 6 is the key waveforms sketch map of no bridge inverter circuit shown in Figure 5;
Fig. 7 is the electrical principle sketch map of the no bridge inverter circuit of the utility model Multiphase Parallel or heterogeneous crisscross parallel;
Fig. 8 adds the electrical principle sketch map of the inverter of inverter bridge for typical Active Clamp Flyback (active anti exciting converter);
Fig. 9 realizes inverter modulated waveform sketch map for Active Clamp Flyback uses the SPWM modulation to add inverter bridge;
Figure 10 is the electrical principle sketch map of the no bridge inverter circuit one of typical case;
Figure 11 is a drive waveforms sketch map of realizing no bridge invert function through the control method corresponding with Figure 10;
Figure 12 is the electrical principle sketch map of the no bridge inverter circuit two of typical case;
Figure 13 uses the typical drive waveforms sketch map of synchronous rectification control for Figure 12 corresponding circuits;
Figure 14 is for forming the electrical principle sketch map of accurate DC/DC with a plurality of parallel connections or crisscross parallel;
Figure 15 constitutes the electrical principle sketch map of no bridge inverter circuit for using the Buck circuit.
Embodiment
Describe below in conjunction with the preferred embodiment of accompanying drawing, should be appreciated that preferred embodiment described herein only is used for explanation and explains the utility model, and be not used in qualification the utility model the utility model.
No bridge inverter circuit embodiment
Embodiment one
According to the utility model embodiment, a kind of no bridge inverter circuit is provided.Like Fig. 5 and shown in Figure 6; Present embodiment comprises power collecting device; Electrical network; DSP, and input connects power collecting device output, control end respectively and connects DSP and the output first accurate DC/DC converter and the second accurate DC/DC converter that two of output is in parallel that get access to grid respectively respectively, wherein:
Above-mentioned DSP; Be used for transmitting control signal to the two first accurate DC/DC converter and the second accurate DC/DC converters that are in parallel; Make the two first accurate DC/DC converters that are in parallel and second accurate DC/DC converter time-sharing work in a preset power frequency period; And half quasi-sine-wave voltage of time-sharing work gained forward and half quasi-sine-wave voltage of negative sense spliced, obtain the standard sine wave voltage;
Under the control of DSP, the first accurate DC/DC converter and the second accurate DC/DC converter are used for time-sharing work in a power frequency period respectively, convert the electric energy of power collecting device into half quasi-sine-wave output; And, in whole power frequency period, half quasi-sine-wave of gained is spliced, make electrical network obtain to constitute and be used for the standard sine wave voltage of supply load by half quasi-sine-wave of forward and half quasi-sine-wave of negative sense;
In whole power frequency period, when the first accurate DC/DC converter was worked, the second accurate DC/DC converter quit work; When the second accurate DC/DC converter was worked, the first accurate DC/DC converter quit work.
No bridge inverter circuit comprises two accurate DC/DC converters among Fig. 5; They convert the electricity of power collecting device into half quasi-sine-wave output respectively; Then in last half quasi-sine-wave output; The second following accurate DC/DC converter quits work; Let the output
be zero volt, what electrical network obtained like this is the half-wave of forward, and when following half quasi-sine-wave is exported; The first top accurate DC/DC converter is quit work; Let the output
be zero volt, electrical network obtains the half-wave of negative sense like this, and two phases also connect; Then form a complete sinusoidal waveform, several typical waveforms are as shown in Figure 6 among Fig. 5.
For the first accurate DC/DC converter or the second accurate DC/DC converter; They have only half power frequency period work; And do not produce loss in out-of-work half power frequency period; And outlet side does not re-use the bridge type inverse structure, has reduced the loss on the inverter bridge, so this scheme can effectively improve the efficient of inverter.
Embodiment two
According to the utility model embodiment, a kind of no bridge inverter circuit is provided.As shown in Figure 7; Present embodiment comprises power collecting device, electrical network, DSP; And input connects power collecting device output, control end respectively and connects DSP and output get access to grid the respectively Multiphase Parallel of output or a plurality of accurate DC/DC converter of heterogeneous crisscross parallel respectively, wherein:
Above-mentioned DSP; Be used for transmitting control signal to a plurality of accurate DC/DC converter of Multiphase Parallel or heterogeneous crisscross parallel; Make a plurality of accurate DC/DC converter time-sharing work in a preset power frequency period of Multiphase Parallel or heterogeneous crisscross parallel; And half quasi-sine-wave voltage of time-sharing work gained forward and half quasi-sine-wave voltage of negative sense spliced, obtain the standard sine wave voltage;
The a plurality of accurate DC/DC converter of Multiphase Parallel or heterogeneous crisscross parallel is used for respectively converting the electric energy of power collecting device into half quasi-sine-wave output; And, be used for control signal based on DSP, time-sharing work in a preset power frequency period, alternative expression provides quasi-sine-wave voltage half to electrical network, the standard sine wave voltage that electrical network is obtained.
In the above-described embodiments, the structure and the performance of each the accurate DC/DC converter in a plurality of accurate DC/DC converter of Multiphase Parallel or heterogeneous crisscross parallel can repeat no more at this referring to the related description of Fig. 5 and Fig. 6.
The core of above-mentioned Fig. 5, Fig. 6 and embodiment shown in Figure 7 is utilized the control of DSP exactly, realizes two accurate DC/DC converter time-sharing works, then the quasi sine half-wave of output is done assembly unit, finally realizes standard sine wave output.The first accurate DC/DC converter among Fig. 5 and the second accurate DC/DC converter also can be the accurate DC/DC converters like Multiphase Parallel among Fig. 7 or heterogeneous crisscross parallel work.
Above-mentioned Fig. 5, Fig. 6 and embodiment shown in Figure 7 are the new inverter structure that on the basis of Fig. 1-inverter shown in Figure 4, proposes, and promptly do not have bridge inverter circuit; This no bridge inverter circuit; The scheme that original DC/DC is added DC/AC is reduced to one-level, directly uses SPWM (Sine Wave Pulse Width Modulation) modulation and DSP (digital signal processor) to realize alternating current output, raises the efficiency; Reduce the quantity of components and parts, reduce cost simultaneously.High efficiency like this requirement not only can reduce the wastage, and improves energy utilization ratio, reduces element and the cost of transportation of handling heat, and the weight of reduction equipment etc.
Above-mentioned Fig. 5, Fig. 6 and embodiment shown in Figure 7; The national energy-saving effect that at some AC voltages is
is more obvious; Because under the same power output situation, low AC voltage characterizes high AC electric current, the loss on the converter bridge switching parts increases; Efficient further descends; If use no bridge inverter structure,, practice thrift more multipotency with the efficient that improves inverter greatly.
Solar energy does not have bridge inverter embodiment
Based on the core concept of above-mentioned no bridge inverter circuit, be example with typical solar inverter, introduce several typical embodiment below.By above-mentioned no bridge inverter circuit, in conjunction with Fig. 8, use two Active Clamp Flyback circuit to do alternation, export the last half-wave and following half-wave of power frequency sine wave respectively, do stack again in load or grid side, realize the sinusoidal output of last standard power frequency.
Embodiment one
According to the utility model embodiment, provide a kind of solar energy not have bridge inverter.Like Figure 10 and shown in Figure 11; Present embodiment comprises the power collecting device that is made up of direct-current input power supplying and the input filter capacitor
that is connected in parallel on the direct-current input power supplying output; Electrical network
and grid side load
; DSP; And input two of the output that connects respectively that direct-current input power supplying output, control end meet DSP respectively and output gets access to grid respectively
the first accurate DC/DC converter and the second accurate DC/DC converter that are in parallel; Direct-current input power supplying is energy storage device or wind energy generating plant or the light heat generator that comprises solar panel PV or storage battery at least.
Wherein, Above-mentioned DSP; Be used for transmitting control signal to the two first accurate DC/DC converter and the second accurate DC/DC converters that are in parallel; Make the two first accurate DC/DC converters that are in parallel and second accurate DC/DC converter time-sharing work in a preset power frequency period, and half quasi-sine-wave voltage of time-sharing work gained forward and half quasi-sine-wave voltage of negative sense are spliced, obtain the standard sine wave voltage;
Under the control of DSP, the first accurate DC/DC converter and the second accurate DC/DC converter are used for time-sharing work in a power frequency period respectively, convert the electric energy of power collecting device into half quasi-sine-wave output; And, in whole power frequency period, half quasi-sine-wave of gained is spliced, make electrical network obtain to constitute and be used for the standard sine wave voltage of supply load by half quasi-sine-wave of forward and half quasi-sine-wave of negative sense;
In whole power frequency period, when the first accurate DC/DC converter was worked, the second accurate DC/DC converter quit work; When the second accurate DC/DC converter was worked, the first accurate DC/DC converter quit work.
In the first accurate DC/DC converter and the second accurate DC/DC converter that above-mentioned two are in parallel; Each accurate DC/DC converter comprises the DC/DC translation circuit of SPWM modulation, and the control switch
that is connected with the DC/DC translation circuit of SPWM modulation; Control switch
; Be used for control signal, the work of DC/DC translation circuit or the out-of-work control switch
of control SPWM modulation based on DSP; N is a natural number.
In the above-described embodiments, the DC/DC translation circuit of SPWM modulation comprises basic anti exciting converter and the various anti exciting converters of deriving, such as typical active inverse-excitation converting circuit and quasi-resonance counterattack circuit; Buck conversion Buck circuit, boost booster circuit, at least a in buck or boost buck-boost circuit and the list/biswitch positive activation type Forward DC transfer circuit.
In Figure 10, the DC/DC translation circuit of SPWM modulation is active inverse-excitation converting circuit.Active inverse-excitation converting circuit comprises clamping capacitance
; Transformer
; Power semiconductor switch
and
;
body diode or extra parallel diode
and
with
; Output filter capacitor
; And transformer
secondary rectifier diode
; Power semiconductor switch
and
comprise at least a in MOS memory MOSFET, insulated gate bipolar transistor npn npn IGBT and the diode at least.
Wherein, The positive pole of above-mentioned direct-current input power supplying is connected with the top of transformer
primary coil; Behind clamping capacitance
, the negative electrode of the drain electrode of power semiconductor switch
and the body diode of
or extra parallel diode
connects; The negative pole of direct-current input power supplying is connected with the anode of the body diode of the source electrode of power semiconductor switch
and
or extra parallel diode
;
The end of transformer
primary coil is connected with the negative electrode of the body diode of the drain electrode of the anode of the body diode of the source electrode of power semiconductor switch
,
or extra parallel diode
, power semiconductor switch
and
or extra parallel diode
;
Transformers
the end of the secondary coil, transformer
secondary rectifier diodes
The anode is connected; transformer
secondary rectifier diodes
The cathode output, the output filter capacitor
, the connected transformers
secondary winding starting end and the reference ground; control switch
in parallel output filter capacitor
ends;
The grid of power semiconductor switch
is used for the pulse signal of input duty cycle for
; The grid of power semiconductor switch
is used for the pulse signal of input duty cycle for
; The control end of control switch
is connected with DSP.
Among Figure 10; Above an Active clamp Flyback (active inverse-excitation converting circuit) use half power frequency period of SPWM modulation work; In this half power frequency period; Following circuit quits work; For guaranteeing that output is zero,
connected all the time, close top Active clamp Flyback circuit after half power frequency period; For guaranteeing that output is zero; Use
with its output short circuit, and following Active clamp Flyback circuit then uses half power frequency period of SPWM modulation work, thus; The output of two Active clamp Flyback all is half quasi-sine-wave; In the load or on the electrical network, they are superimposed as standard sine wave, main driving and output waveform such as Figure 11 that Figure 10 is corresponding.
among Figure 10 and
switch; Can be MOSFET (metal-oxide layer-semiconductor-field-effect transistor); Also can be SCR (silicon controlled rectifier); Can also be IGBT controlled or half control silicon crystal elements such as (insulated gate bipolar transistors),
be the load of grid side.
Two Active clamp Flyback circuit among Figure 10 have used
and
will export short circuit idle separately the time, serve as zero purpose to reach output voltage.Following Figure 12 is other a kind of embodiment;
among Figure 10 is put into the D1 position mutually arranged side by side with D2 respectively with
; Control mode still adopts method shown in Figure 11; When top Flyback works; Following Flyback
kept conducting; This moment, load current flow through
; And the main transformer through following Flyback; The main transformer of Flyback is presented as output inductor for top Flyback below this moment, and the Flyback output capacitance of above constitutes the CL filter structure.Ensuing half power frequency period
is kept conducting; The transformer of top Flyback is presented as filter inductance, forms the CL filter structure at the negative half period of output.
The D1 and the D2 of
and
parallel connection; Can utilize
and
self parasitic diode to realize; And in oneself half power frequency period work; Can also realize synchronous rectification control; Further raise the efficiency, its corresponding controlling and driving is shown in figure 13.
Embodiment two
Different with the foregoing description two is; In the present embodiment; Like Figure 12 and shown in Figure 13, control switch
is connected in parallel on the two ends of transformer
secondary rectifier diode
.
Except Active clamp Flyback; The DC/DC topology of PWM such as Buck, Boost, Forward, Buck-boost modulation; Also can realize no bridge inverter structure as shown in Figure 5; As long as let them work in the output situation of half quasi-sine-wave, do stack again with two same converters then, can realize sinusoidal output.The benefit of this scheme is, reduced the traditional inverter bridge of one-level, and reducing the wastage subtracts, and raises the efficiency, and reduces the original paper of handling heat, reduces the weight of equipment, reduces cost of transportation etc.
Embodiment three
According to the utility model embodiment, provide a kind of solar energy not have bridge inverter.Shown in figure 14; Present embodiment comprises the power collecting device that is made up of direct-current input power supplying and the input filter capacitor
that is connected in parallel on the direct-current input power supplying output; Electrical network
and grid side load
; DSP; And input connect respectively that direct-current input power supplying output, control end meet DSP respectively and output gets access to grid respectively
Multiphase Parallel of output or a plurality of accurate DC/DC converter of heterogeneous crisscross parallel, wherein:
DSP; Be used for transmitting control signal to a plurality of accurate DC/DC converter of Multiphase Parallel or heterogeneous crisscross parallel; Make a plurality of accurate DC/DC converter time-sharing work in a preset power frequency period of Multiphase Parallel or heterogeneous crisscross parallel; And half quasi-sine-wave voltage of time-sharing work gained forward and half quasi-sine-wave voltage of negative sense spliced, obtain the standard sine wave voltage;
The a plurality of accurate DC/DC converter of Multiphase Parallel or heterogeneous crisscross parallel is used for respectively converting the electric energy of power collecting device into half quasi-sine-wave output; And, be used for control signal based on DSP, time-sharing work in a preset power frequency period, alternative expression provides quasi-sine-wave voltage half to electrical network, the standard sine wave voltage that electrical network is obtained.
In Figure 14, the concrete structure and the performance of each the accurate DC/DC converter in a plurality of accurate DC/DC converter of Multiphase Parallel or heterogeneous crisscross parallel can repeat no more at this referring to the related description of Figure 10 about each accurate DC/DC converter.
Shown in figure 14, it is on the basis of Figure 10, to add n same accurate DC/DC converter again, lets a plurality of same accurate DC/DC parallel connection or crisscross parallels use; Accurate DC/DC work and half power frequency period of meeting half way then; Other half power frequency period quits work, and second half accurate DC/DC is operated in ensuing half power frequency period, and so latter two half-wave is combined into the standard power frequency period in load or grid side; Do like this; Not only can reduce ripple, can also reduce the wastage, unique volume of converter that it should be noted that needs appropriate design.Same, can do parallel connection or crisscross parallel with a plurality of accurate DC/DC to structure shown in Figure 12, export the sine wave of half power frequency period then, no longer specify here.
Embodiment four
Different with the foregoing description is that shown in figure 15, the DC/DC translation circuit of SPWM modulation is active inverse-excitation converting circuit.Buck conversion Buck circuit comprises power semiconductor switch
; The body diode of
or extra parallel diode
; Output filter capacitor
; Rectifier diode
, and resonant inductance
.
Wherein, The positive pole of above-mentioned direct-current input power supplying is connected with the negative electrode of the body diode of the drain electrode of power semiconductor switch
and
or extra parallel diode
; The negative pole of direct-current input power supplying is connected with the anode of rectifier diode
and with reference to ground;
Power semiconductor switch power semiconductor switch
body diode or the anode of extra parallel diode
and the negative electrode of rectifier diode
of source electrode,
connect; Behind resonant inductance
and output filter capacitor
, connect with reference to ground, and behind control switch
ground connection;
The grid of power semiconductor switch
is used for the pulse signal of input duty cycle for
; The control end of control switch
is connected with DSP.
Same; If change
among Figure 15 and
into switch; Remove
and
; The control method of using similar Figure 12 also is the no bridge inverter that can realize with synchronous rectification, can further raise the efficiency.For powerful application scenario; Figure 15 can also combine the mode of Multiphase Parallel among Fig. 7 or heterogeneous crisscross parallel to share power, not only can reduce ripple, can also further raise the efficiency; Realize efficient no bridge inversion, its concrete realization is schemed similar shown in Figure 14.Corresponding boost circuit, the buck-boost circuit, the DC/DC circuit of PWM such as forward circuit modulation also can be modulated to realize no bridge inverter structure according to structure connection shown in Figure 5 and according to SPWM, no longer specifies here.
In sum; No bridge inverter circuit and the solar energy of each embodiment of the utility model do not have bridge inverter; Core is no bridge inverter structure; Promptly use two accurate DC/DC converters respectively in the positive half cycle and the negative half period work of power frequency, half quasi-sine-wave through output superposes to obtain last power frequency sine wave then, realizes no-reverse change bridge construction (shown in Figure 4); These two accurate DC/DC converters can be for the DC/DC converter circuit be topological arbitrarily, these circuit structures that are not limited to mention among the application; Use no bridge construction, reduced the switch crystal original paper that output current flows through, reduced loss, raise the efficiency, reduce the quantity of switching component simultaneously, reduce the cost of inverter, this will help optimizing Design of Inverter greatly.
What should explain at last is: the above is merely the preferred embodiment of the utility model; Be not limited to the utility model; Although the utility model has been carried out detailed explanation with reference to previous embodiment; For a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (11)
1. no bridge inverter circuit; It is characterized in that; Comprise power collecting device, electrical network, DSP; And input connects power collecting device output, control end respectively and connects DSP and output get access to grid the respectively Multiphase Parallel of output or a plurality of accurate DC/DC converter of heterogeneous crisscross parallel respectively, wherein:
Said DSP; Be used for transmitting control signal to a plurality of accurate DC/DC converter of Multiphase Parallel or heterogeneous crisscross parallel; Make a plurality of accurate DC/DC converter time-sharing work in a preset power frequency period of Multiphase Parallel or heterogeneous crisscross parallel; And half quasi-sine-wave voltage of time-sharing work gained forward and half quasi-sine-wave voltage of negative sense spliced, obtain the standard sine wave voltage;
The a plurality of accurate DC/DC converter of said Multiphase Parallel or heterogeneous crisscross parallel is used for respectively converting the electric energy of said power collecting device into half quasi-sine-wave output; And, be used for control signal based on DSP, time-sharing work in a preset power frequency period, alternative expression provides quasi-sine-wave voltage half to electrical network, the standard sine wave voltage that electrical network is obtained.
2. no bridge inverter circuit according to claim 1 is characterized in that, a plurality of accurate DC/DC converter of said Multiphase Parallel or heterogeneous crisscross parallel comprises the two first accurate DC/DC converter and the second accurate DC/DC converters that are in parallel;
Under the control of said DSP, the first accurate DC/DC converter and the second accurate DC/DC converter are used for time-sharing work in a power frequency period respectively, convert the electric energy of power collecting device into half quasi-sine-wave output; And, in whole power frequency period, half quasi-sine-wave of gained is spliced, make electrical network obtain to constitute and be used for the standard sine wave voltage of supply load by half quasi-sine-wave of forward and half quasi-sine-wave of negative sense;
In whole power frequency period, when the said first accurate DC/DC converter was worked, the second accurate DC/DC converter quit work; When the second accurate DC/DC converter was worked, the first accurate DC/DC converter quit work.
3. a solar energy does not have bridge inverter; It is characterized in that; Comprise the power collecting device that constitutes by direct-current input power supplying and the input filter capacitor
that is connected in parallel on said direct-current input power supplying output; Electrical network
and grid side load
; DSP; And input connect respectively that direct-current input power supplying output, control end meet DSP respectively and output gets access to grid respectively
Multiphase Parallel of output or a plurality of accurate DC/DC converter of heterogeneous crisscross parallel, wherein:
Said DSP; Be used for transmitting control signal to a plurality of accurate DC/DC converter of Multiphase Parallel or heterogeneous crisscross parallel; Make a plurality of accurate DC/DC converter time-sharing work in a preset power frequency period of Multiphase Parallel or heterogeneous crisscross parallel; And half quasi-sine-wave voltage of time-sharing work gained forward and half quasi-sine-wave voltage of negative sense spliced, obtain the standard sine wave voltage;
The a plurality of accurate DC/DC converter of said Multiphase Parallel or heterogeneous crisscross parallel is used for respectively converting the electric energy of said power collecting device into half quasi-sine-wave output; And, be used for control signal based on DSP, time-sharing work in a preset power frequency period, alternative expression provides quasi-sine-wave voltage half to electrical network, the standard sine wave voltage that electrical network is obtained.
4. solar energy according to claim 3 does not have bridge inverter, it is characterized in that a plurality of accurate DC/DC converter of said Multiphase Parallel or heterogeneous crisscross parallel comprises the two first accurate DC/DC converter and the second accurate DC/DC converters that are in parallel;
Under the control of said DSP, the first accurate DC/DC converter and the second accurate DC/DC converter are used for time-sharing work in a power frequency period respectively, convert the electric energy of power collecting device into half quasi-sine-wave output; And, in whole power frequency period, half quasi-sine-wave of gained is spliced, make electrical network obtain to constitute and be used for the standard sine wave voltage of supply load by half quasi-sine-wave of forward and half quasi-sine-wave of negative sense;
In whole power frequency period, when the said first accurate DC/DC converter was worked, the second accurate DC/DC converter quit work; When the second accurate DC/DC converter was worked, the first accurate DC/DC converter quit work.
5. there is not bridge inverter according to claim 3 or 4 described solar energy; It is characterized in that; In a plurality of accurate DC/DC converter of said Multiphase Parallel or heterogeneous crisscross parallel; Each accurate DC/DC converter comprises the DC/DC translation circuit of SPWM modulation, and the control switch
that is connected with the DC/DC translation circuit of said SPWM modulation;
Said control switch
; Be used for control signal, the work of DC/DC translation circuit or the out-of-work control switch
of control SPWM modulation based on DSP; N is a natural number.
6. solar energy according to claim 5 does not have bridge inverter; It is characterized in that; The DC/DC translation circuit of said SPWM modulation; Comprise active inverse-excitation converting circuit, buck conversion Buck circuit, boost booster circuit, at least a in buck or boost buck-boost circuit and the list/biswitch positive activation type Forward DC transfer circuit.
7. solar energy according to claim 6 does not have bridge inverter; It is characterized in that; Said active inverse-excitation converting circuit comprises clamping capacitance
; Transformer
; Power semiconductor switch
and
;
body diode or extra parallel diode
and
with
; Output filter capacitor
, and transformer
secondary rectifier diode
; Wherein:
The positive pole of said direct-current input power supplying is connected with the top of transformer
primary coil; Behind clamping capacitance
, the negative electrode of the drain electrode of power semiconductor switch
and the body diode of
or extra parallel diode
connects; The negative pole of said direct-current input power supplying is connected with the anode of the body diode of the source electrode of power semiconductor switch
and
or extra parallel diode
;
The end of said transformer
primary coil is connected with the negative electrode of the body diode of the drain electrode of the anode of the body diode of the source electrode of power semiconductor switch
,
or extra parallel diode
, power semiconductor switch
and
or extra parallel diode
;
The end of said transformer
secondary coil is connected with the anode of transformer
secondary rectifier diode
; The negative electrode of transformer
secondary rectifier diode
is an output; Behind output filter capacitor
, connect the top and the reference ground of transformer
secondary coil;
10. solar energy according to claim 7 does not have bridge inverter, it is characterized in that said direct-current input power supplying is energy storage device or wind energy generating plant or the light heat generator that comprises solar panel PV or storage battery at least;
11. solar energy according to claim 6 does not have bridge inverter; It is characterized in that; Said buck conversion Buck circuit comprises power semiconductor switch
; The body diode of
or extra parallel diode
; Output filter capacitor
; Rectifier diode
, and resonant inductance
; Wherein:
The positive pole of said direct-current input power supplying is connected with the negative electrode of the body diode of the drain electrode of power semiconductor switch
and
or extra parallel diode
; The negative pole of said direct-current input power supplying is connected with the anode of rectifier diode
and with reference to ground;
Said power semiconductor switch power semiconductor switch
body diode or the anode of extra parallel diode
and the negative electrode of rectifier diode
of source electrode,
connect; Behind resonant inductance
and output filter capacitor
, connect with reference to ground, and behind control switch
ground connection;
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