CN105897024A - Single-phase Cuk integrated boost-buck inverter and control method and control system thereof - Google Patents

Abstract

The invention discloses a single-phase Cuk integrated boost-buck inverter and a control method and control system thereof. The single-phase Cuk integrated boost-buck inverter comprises a boost capacitor C1, a capacitor C2, switching tubes S1, S2, S3 and S4, an inductor L1, an inductor L2, a diode D1 and a diode D2, wherein a junction point a of the switching tubes S1 and S2 is connected with the positive electrode of the diode D1, a junction point b of the switching tubes S3 and S4 is connected with the positive electrode of the diode D2, the positive electrodes of the diode D1 and the diode D2 are jointly connected with one end of the boost capacitor C1, the other end of the boost capacitor C1 is connected with one end of the inductor L2, the other end of the inductor L2 is connected with one end of the capacitor C2, the switching tube S2 and the switching tube S4 separately, and the other end the inductor L2 is connected with the inductor L1, the switching tube S1 and the switching tube S3 separately. Through the common switching tubes, a Cuk converter and a traditional full-bridge inverter are integrated, a multi-control composite modulation strategy is adopted, meanwhile, the pumping DC bus voltage of the inverter and the sine output voltage are achieved, and the single-phase Cuk integrated boost-buck inverter has the advantages of simplicity in topology, high integration, high voltage grain, low cost and the like.

Description

Single-phase Cuk integrated form buck-boost inverter and control method, control system

Technical field

The present invention relates to a kind of inverter and control method thereof, be specifically related to a kind of single-phase Cuk integrated form buck-boost inverter and control Method processed, control system.

Background technology

The wide range of output voltage meeting of the novel power supply such as photovoltaic cell and fuel cell, this just requires that supporting inverter is necessary Possesses buck ability, so that it all can export stable AC energy in whole input voltage range.Use two-stage type structure, I.e. DC-DC lifting/voltage reducing changer cascades with traditional PWM voltage source inverter, can solve the problems referred to above very easily. But there is the shortcomings such as structure is complicated, relatively costly in this scheme.By comparison, single-stage voltage boosting/reducing inverter will be one more Suitably topology selects.

Research finds, the single-stage inverter at present with buck ability mainly has: Z-source inverter, combination type inverter are (as double Buck-Boost inverter), active buck-boost inverter etc..Regrettably, there is voltage gain not in Z source or quasi-Z-source inverter Foot, the deficiencies such as inrush current is big, and number of devices is many, and structure is complicated.Combination type inverter is non-uniform due to practical devices Property, there is bigger DC component in its output, and is difficult to take into account the rapidity of system and stability, is easily caused about output waveform Asymmetric.The switching tube quantity of active buck-boost inverter is more (8), and its gain is not enough simultaneously, controls more complicated.

Summary of the invention

Goal of the invention: the invention aims to solve deficiency of the prior art, it is provided that a kind of by Cuk changer and tradition Full-bridge inverter integrates, and uses many controlled quentity controlled variables complex modulated strategy, realizes the pump of inverter DC bus-bar voltage simultaneously Liter and output voltage sine, have topological succinct, integrated level height, voltage gain height, the single-phase Cuk collection of low cost and other advantages Accepted way of doing sth buck-boost inverter and control method, control system.

Technical scheme: one of the present invention single-phase Cuk integrated form buck-boost inverter, including boost capacitor C₁, electric capacity C₂, switching tube S₁-S₄, inductance L₁, inductance L₂, diode D₁With diode D₂, described switching tube S₁And S₂Series connection is formed First bridge arm circuit, described switching tube S₃And S₄Series connection forms the second bridge arm circuit, described first bridge arm circuit and the second brachium pontis electricity Road parallel connection forms full-bridge circuit；Described switching tube S₁And S₂Abutment a connect have diode D₁Anode, described switching tube S₃And S₄Abutment b connect have diode D₂Anode, described diode D₁With diode D₂Negative electrode jointly connect and have Boost capacitor C₁One end, described boost capacitor C₁The other end connect have inductance L₂One end, described inductance L₂The other end It is connected to electric capacity C₂One end, switching tube S₂, switching tube S₄, described electric capacity C₂The other end be connected to inductance L₁、 Switching tube S₁, switching tube S₃。

Further, described diode D₁With diode D₂Negative electrode jointly connect and have boost capacitor C₁Positive pole, boost capacitor C₁Negative pole connect have inductance L₂One end.

Further, described boost capacitor C₁Positive pole and inductance L₁Between be provided with input power.

Further, it is also associated with filter circuit between described abutment a and abutment b.

Further, described filter circuit uses LC filter circuit or LCL filter circuit, and described filter circuit is also associated with bearing Carry.

Further, described switching tube S₁-S₄Each contain body diode D respectively_s1-D_s4。

The invention also discloses the control method of above-mentioned a kind of single-phase Cuk integrated form buck-boost inverter: this inverter uses many controls Amount complex modulated strategy processed, i.e. modulation circuit contains multiple controlled quentity controlled variable: S_a、S_bAnd S_c；Wherein, S_aIt is used for controlling output voltage Sine degree, S_bPositive-negative polarity for alternating voltage judges signal, and S_cFor controlling DC bus-bar voltage, to meet inversion institute Need voltage conditions, S_aThe absolute value exported by output-voltage loop actuator and carrier signal produce after being modulated circuit handing-over, and S_c Output and carrier signal by busbar voltage ring actuator are modulated after circuit joins and produce, and the two carrier signal is identical, Can be asymmetric triangular wave, front along sawtooth waveforms or back edge sawtooth waveforms, based on above three associated control signal, enter one Step can be obtained, by logical operations, the driving signal S that inverter finally needs₁-S₄。

Further, described inverter work process in each switch periods of sinusoidal modulation wave positive half-wave includes following three kinds Mode:

(1) mode 1, t₀-t₁: t₀Before moment, S₂And S₄Conducting, L₁、L₂Because being respectively subjected to backward voltage (U_C2-U_in) and U_C1 And linear discharge；At t₀Moment, S₂Turn off, S₁Conducting, to t₁In the moment, mode 1 terminates；In this mode, for Cuk liter Laminate section, diode D₁Conducting, supply voltage is all added to input inductance L₁On, inductive current i_L1(t) linear increase, meanwhile, Due to electric capacity C₂Electric discharge, outputting inductance L₂Electric current i_L2Also in linear increase；

(2) mode 2, t₁-t₂: t₁Moment, S₄Turn off, S₃Conducting, to t₂In the moment, mode 2 terminates；Cuk is boosted Part, D₁、D₂Conducting, L₁、L₂It is still subject to forward voltage U_in(U_C2-U_C1), electric current i_L1(t)、i_L2T () continues linear rise；

(3) mode 3, t₂-t₃: t₂Moment, S₁Turn off, S₂Conducting, to t₃In the moment, mode 3 terminates, next switch week Phase, repeat said process；For Cuk boosting part, D₁、D₂Conducting, electric current i_L1(t)、i_L2T () passes through D_s2、D_s4 Afterflow, inductance L₁Energy storage to electric capacity C₂Transfer, now L₁、L₂Bear backward voltage (U_C2-U_in) and U_C1, i_L1(t)、i_L2(t) Linear reduction.

Further, the voltage transfer ratio of described inverterM in formula_spwmFor modulation ratio, D_boostFor The dutycycle of Cuk.

The present invention further discloses a kind of single-phase Cuk integrated form buck-boost inverter control system, and this system includes above-mentioned Single-phase Cuk integrated form buck-boost inverter.

Beneficial effect: Cuk changer and conventional full bridge inverter, by shared power switch pipe, are integrated by the present invention, And using many controlled quentity controlled variables complex modulated strategy, the pump simultaneously realizing inverter DC bus-bar voltage rises and output voltage sine, tool There are topological succinct, integrated level height, voltage gain height, low cost and other advantages.

Accompanying drawing explanation

Fig. 1 is the main circuit topology schematic diagram of inverter of the present invention；

Fig. 2 is that the present invention mixes SPWM modulation logic circuit diagram；

Fig. 3 is the main oscillogram of control mode of the present invention；

Fig. 4 is mode 1 equivalent schematic in control method of the present invention；

Fig. 5 is mode 2 equivalent schematic in control method of the present invention；

Fig. 6 is mode 3 equivalent schematic in control method of the present invention；

Fig. 7 is the Control system architecture block diagram of the present invention；

Fig. 8 is DC bus-bar voltage u during input voltage 170V in simulating, verifying_dcWaveform diagram；

Fig. 9 is input during input voltage 170V in simulating, verifying, output voltage u_inAnd u_oWaveform diagram；

Figure 10 is DC bus-bar voltage u during input voltage 105V in simulating, verifying_dcWaveform diagram；

Figure 11 is input during input voltage 105V in simulating, verifying, output voltage u_inAnd u_oWaveform diagram.

Detailed description of the invention

Below in conjunction with specific embodiments and the drawings, the operation principle of the present invention is described in further details:,

Fig. 1 gives the circuit structure of the single-phase Cuk integrated form buck-boost inverter that the present invention proposes, and it is drilled by Cuk changer Become, by the body diode (D of the lower switching tube of multiplexing full-bridge inverter_S2、D_S4) and upper switching tube (S₁、S₃), it is achieved Cuk changer and full-bridge inverter integrated, is realized the function originally realized by two stage power conversion by one-level power conversion.

Concrete, this inverter includes boost capacitor C₁, electric capacity C₂, switching tube S₁-S₄, inductance L₁, inductance L₂, diode D₁With diode D₂, described switching tube S₁And S₂Series connection forms the first bridge arm circuit, described switching tube S₃And S₄Series connection is formed Second bridge arm circuit, described first bridge arm circuit and the second bridge arm circuit parallel connection form full-bridge circuit；Described switching tube S₁And S₂ Abutment a connect have diode D₁Anode, described switching tube S₃And S₄Abutment b connect have diode D₂Anode, Described diode D₁With diode D₂Negative electrode jointly connect and have boost capacitor C₁One end, described boost capacitor C₁Another End connection has inductance L₂One end, described inductance L₂The other end be connected to electric capacity C₂One end, switching tube S₂, switch Pipe S₄, described electric capacity C₂The other end be connected to inductance L₁, switching tube S₁, switching tube S₃。

It can be seen that compared with traditional full-bridge inverter, which only adds two counnter attack diode (D₁、D₂), a boosting Electric capacity (C₁) and two inductance (L₁、L₂).And only with mixing SPWM modulation, just can realize DC voltage pumping-up and inversion simultaneously Function.Therefore, this inverter has that efficiency is high, integrated level is high, easy to control, simple for structure, low cost and other advantages.

The Cuk integrated form buck-boost inverter that the present invention proposes uses many controlled quentity controlled variables complex modulated strategy.Adjust with traditional unipolarity Unlike system (including one pole multiple-frequency modulation) and bipolar modulation mode, many controlled quentity controlled variables complex modulated circuit contains multiple controlled quentity controlled variable: S_a、S_bAnd S_c；Wherein, S_aIt is used for controlling the sine degree of output voltage, S_bPositive-negative polarity for alternating voltage judges signal, and S_cFor controlling DC bus-bar voltage, to meet inversion required voltage condition.S_aThe absolute value exported by output-voltage loop actuator Produce after being modulated circuit handing-over with carrier signal, and S_cOutput and carrier signal by busbar voltage ring actuator are modulated circuit Producing after handing-over, the two carrier signal is identical, can be that asymmetric triangular wave, front are along sawtooth waveforms or back edge saw Tooth ripple.Based on above three associated control signal, can be obtained, by logical operations, the driving signal that inverter finally needs further S₁-S₄。

Inverter switching sequence in a switch periods is as shown in table 1.In table, in " 1 " represents switch periods, switching tube is in Conducting state, " 0 ", represent that switching tube is off state.In conjunction with this switching sequence, the operation principle drawing inverter can be analyzed And characteristic.

Table 1 switching tube conducting state

For inverter, in the positive and negative half-wave of its sinusoidal modulation wave, work process is similar, here with in positive half-wave It is analyzed as a example by switch periods.

For simplifying the analysis, assume initially that inverter work has reached stable state, and meet following condition: the most all power tubes, Inductance, electric capacity are ideal element；2. output inductor L_oSufficiently large, its electric current is substantially constant in a switch periods, Therefore constant-current source I can be equivalent to_o；3. electric capacity C₁、C₂Sufficiently large, its terminal voltage U_C1And U_C2It is approximately constant, therefore can be equivalent to Constant pressure source；④n₀The current potential of point is zero.Accordingly, in each switch periods of positive half cycle, the work of inverter all can divide Become 3 mode, its main waveform as it is shown on figure 3, equivalent circuit corresponding to each operation mode the most as Figure 4-Figure 6.

Consider control signal S of inverter_cAnd S_aDetermine inverter DC bus-bar voltage gain and inversion modulation ratio respectively, therefore can Analyze the operation principle of inverter based on principle of stacking, the work breakdown of inverter will become Cuk boosting and two mistakes of full-bridge inverting Journey, is analyzed respectively, is then overlapped.Based on this thought, mode 1 equivalent circuit shown in Fig. 4 can correspondingly be split into Two parts, as shown in Fig. 4 (b) and 4 (c).

Thus, Fig. 4 (a) breaker in middle pipe S₁-S₄Electric current, the corresponding current component sum in Fig. 4 (b) and Fig. 4 (c) can be considered as, That is:

i_Sk(t)=i_Sk1(t)+i_Sk2(t) k=1,2,3,4 (1)

In formula, i_Sk1(t) and i_Sk2T () is Cuk boosting component and the full-bridge inverting component of each switching tube respectively.

In like manner, mode 2 and 3 can be done same process.

(1) mode 1:[t₀-t₁] (shown in equivalent circuit such as Fig. 4 (a)).

t₀Before moment, S₂And S₄Conducting, L₁、L₂Because being respectively subjected to backward voltage (U_C2-U_in) and U_C1And linear discharge.At t₀ Moment, S₂Turn off, S₁Conducting, to t₁In the moment, mode 1 terminates.

In this mode, for Cuk boosting part, diode D₁Conducting, supply voltage is all added to input inductance L₁On, electricity Inducing current i_L1(t) linear increase.Simultaneously as electric capacity C₂Electric discharge, outputting inductance L₂Electric current i_L2Also in linear increase.(etc. Shown in effect circuit such as Fig. 4 (b))

$i_{L1}\left(t\right)=i_{in}\left(t\right)=\frac{U_{in}}{L_1}(t-t_0)+i_{L1}\left(t_0\right)---\left(2\right)$

$i_{L2}\left(t\right)=\frac{U_{C2}-U_{C1}}{L_2}(t-t_0)+i_{L2}\left(t_0\right)---\left(3\right)$

i_D1(t)=i_S11(t) (4)

For full-bridge inverting part, export electric current I_oBy switching tube S₁、S₄Flow through.(shown in equivalent circuit such as Fig. 4 (c))

i_S4(t)=i_S12(t)=I_o (5)

Then have:

i_S2(t)=i_S3(t)=i_D2(t)=0 (6)

(2) mode 2:[t₁-t₂] (shown in equivalent circuit such as Fig. 5 (a)).

t₁Moment, S₄Turn off, S₃Conducting, to t₂In the moment, mode 2 terminates.

For Cuk boosting part, D₁、D₂Conducting, L₁、L₂It is still subject to forward voltage U_in(U_C2-U_C1), electric current i_L1(t)、 i_L2T () continues linear rise.(shown in equivalent circuit such as Fig. 5 (b))

$i_{L1}\left(t\right)=i_{in}\left(t\right)=\frac{U_{in}}{L_1}(t-t_1)+i_{L1}\left(t_1\right)---\left(7\right)$

$i_{L2}\left(t\right)=\frac{U_{C2}-U_{C1}}{L_2}(t-t_1)+i_{L2}\left(t_1\right)---\left(8\right)$

i_D1(t)=i_S11(t) (9)

i_D2(t)=i_S31(t) (10)

For full-bridge inverting part, export electric current I_oThrough switching tube S₁And S₃Body diode afterflow.(equivalent circuit such as Fig. 5 (c) institute Show)

i_S12(t)=i_S32(t)=I_o (11)

Then have:

i_S2(t)=i_S4(t)=0 (12)

(3) mode 3:[t₂-t₃] (shown in equivalent circuit such as Fig. 6 (a)).

t₂Moment, S₁Turn off, S₂Conducting, to t₃In the moment, mode 3 terminates.Next switch periods starts, and repeats above-mentioned mistake Journey.

At Cuk boosting part, D₁、D₂Conducting, electric current i_L1(t)、i_L2T () passes through D_s2、D_s4Afterflow, inductance L₁Energy storage to Electric capacity C₂Transfer.Now L₁、L₂Bear backward voltage (U_C2-U_in) and U_C1, i_L1(t)、i_L2T () linearly reduces.(equivalent circuit is such as Shown in Fig. 6 (b))

$i_{L1}\left(t\right)=\frac{U_{C2}-U_{in}}{L_1}(t-t_3)+i_{L1}\left(t_3\right)---\left(13\right)$

$i_{L2}\left(t\right)=\frac{U_{C1}}{L_2}(t-t_3)+i_{L2}\left(t_3\right)---\left(14\right)$

i_D1(t)=i_S21(t) (15)

i_D2(t)=i_S41(t) (16)

For full-bridge inverting part, export electric current I_oThrough switching tube S₄And S₂Body diode afterflow.(equivalent circuit such as Fig. 6 (c) institute Show)

i_S22(t)=i_S42(t)=I_o (17)

Then have:

i_S1(t)=i_S3(t)=0 (18)

From the figure 3, it may be seen that the inverter switching device cycle is T_s(i.e. t₀-t₃Time period), can be seen that Cuk part in conjunction with Fig. 4 (b)-6 (b) It is (t to boost inductance charging interval section₀-t₂), discharge time, section was (t₂-t₃).Dutycycle in the defined herein boost inductance charging interval D_boostFor:

$D_{boost}=\frac{t_2-t_0}{T_s}---\left(19\right)$

According to the transfer ratio relation of Cuk circuit output voltage Yu input voltage, electric capacity C can be obtained₁Terminal voltage U_C1For:

$U_{C1}=\frac{D_{boost}}{1-D_{boost}}{U}_{in}---\left(20\right)$

Then inverter DC bus-bar voltage U_dc, i.e. U_C2For:

$U_{dc}=U_{C2}=U_{C1}+U_{in}=\frac{U_{in}}{1-D_{boost}}---\left(21\right)$

For full-bridge inverting part shown in Fig. 4 (c)-6 (c), the output voltage U of inverter bridge_oWith DC bus-bar voltage U_dcMeet equation:

U_o=M_spwmU_dc (22)

In formula, M_spwmModulate ratio for inverter bridge, and meet M_spwm<D_boost。

The voltage transfer ratio that can obtain inverter is:

$G=\frac{U_o}{U_{in}}=\frac{M_{spwm}}{1-D_{boost}}---\left(23\right)$

By formula (23) it can be seen that voltage transfer ratio G of this inverter compares M with modulation_spwmAnd dutycycle D of Cuk_boost Relevant, G is along with M_spwmAnd D_boostIncrease and increase, but the most constrained condition M_spwm<D_boostRestriction.Wherein, 1/(1-D_boost) it is the boosting gain of Cuk boosting part, work as M_spwmMore than (1-D_boost) time, G > 1, i.e. inverter possess boosting Function, otherwise, then inverter has the ability of blood pressure lowering.

Fig. 7 is the system closed loop control block diagram of single-phase Cuk integrated form buck-boost inverter.In figure, the dc bus electricity of inverter Pressure ring and output-voltage loop can use the linear regulators such as PI, PID, and the two independently controls.The modulation of actuator 1 output Signal and the absolute value modulation signal u of actuator 2 output_r1And u_r2Join with carrier signal respectively through signal modulation circuit, Produce control signal S_cAnd S_a.Wherein, the carrier signal of two modulation circuits is identical, can be asymmetric triangular wave, Front is along sawtooth waveforms or back edge sawtooth waveforms.Finally, by S_a、S_cSignal S is judged with alternating voltage positive-negative polarity_bSend into Fig. 2 institute The logical operation circuit shown, obtains the driving signal S of four switching tubes of inverter₁-S₄。

For verifying feasibility and the correctness of theory analysis thereof of Cuk integrated form buck-boost inverter proposed by the invention, build The model machine of one 500W/20kHz has carried out simulating, verifying, and its design objective is as follows:

DC input voitage U_in=105V-170V, DC bus-bar voltage U_dc=330V, output voltage U_o=110V/50Hz, filtering Inductance L₁=5mH, L₂=1mH, boost capacitor C₁=2000 μ F, bus capacitor C₂=2000 μ F, S₁～S₂Use IPW60R0410C6, D₁And D₂Use IDW30G65C5.

Fig. 8, Fig. 9 and Figure 10, Figure 11 sets forth U_inThe DC bus-bar voltage u of inverter during=170V and 105V_dc, Output voltage u_o, input voltage u_inSimulation waveform.Wherein, the benchmark of DC bus-bar voltage ring and ac output voltage ring is respectively For 3.3V and 1.56V, downsampling factor is 0.01.

It can be seen that inverter have employed mixing SPWM modulator approach, when input voltage is 170V, u_dcMeansigma methods be 330.11V, u_oAmplitude be 156.11V, this shows that system achieves blood pressure lowering and inversion function well；And when input voltage is During 105V, u_dcMeansigma methods be 330.18V, u_oAmplitude be 156.05V, now show system well achieve boosting and Inversion function, these simulation results are the most identical with theory analysis.

Cuk changer and conventional full bridge inverter, by shared power switch pipe, are integrated by the present invention, use control more Amount complex modulated strategy, the pump simultaneously realizing inverter DC bus-bar voltage rises and output voltage sine, have topology succinct, Integrated level is high, voltage gain is high, low cost and other advantages.

The above, be only presently preferred embodiments of the present invention, and the present invention not makees any pro forma restriction, although this Invent disclosed above with preferred embodiment, but be not limited to the present invention, any those skilled in the art, In the range of technical solution of the present invention, when the technology contents of available the disclosure above makes a little change or is modified to equivalent change The Equivalent embodiments changed, as long as being the content without departing from technical solution of the present invention, implements above according to the technical spirit of the present invention Any simple modification, equivalent variations and the modification that example is made, all still falls within the range of technical solution of the present invention.

Claims (10)

1. a single-phase Cuk integrated form buck-boost inverter, it is characterised in that: include boost capacitor C₁, electric capacity C₂, switch Pipe S₁-S₄, inductance L₁, inductance L₂, diode D₁With diode D₂, described switching tube S₁And S₂Series connection forms the first brachium pontis Circuit, described switching tube S₃And S₄Series connection forms the second bridge arm circuit, described first bridge arm circuit and the second bridge arm circuit parallel connection shape Become full-bridge circuit；Described switching tube S₁And S₂Abutment a connect have diode D₁Anode, described switching tube S₃And S₄ Abutment b connect have diode D₂Anode, described diode D₁With diode D₂Negative electrode jointly connect and have boost capacitor C₁One end, described boost capacitor C₁The other end connect have inductance L₂One end, described inductance L₂The other end connect respectively There is electric capacity C₂One end, switching tube S₂, switching tube S₄, described electric capacity C₂The other end be connected to inductance L₁, switching tube S₁, switching tube S₃。

One the most according to claim 1 single-phase Cuk integrated form buck-boost inverter, it is characterised in that: described two poles Pipe D₁With diode D₂Negative electrode jointly connect and have boost capacitor C₁Positive pole, boost capacitor C₁Negative pole connect have inductance L₂ One end.

One the most according to claim 1 and 2 single-phase Cuk integrated form buck-boost inverter, it is characterised in that: described Boost capacitor C₁Positive pole and inductance L₁Between be provided with input power.

One the most according to claim 1 single-phase Cuk integrated form buck-boost inverter, it is characterised in that: described joint It is also associated with filter circuit between some a and abutment b.

One the most according to claim 4 single-phase Cuk integrated form buck-boost inverter, it is characterised in that: described filtering Circuit uses LC filter circuit or LCL filter circuit, and described filter circuit is also associated with load.

One the most according to claim 1 single-phase Cuk integrated form buck-boost inverter, it is characterised in that: described switch Pipe S₁-S₄Contain body diode D respectively_s1-D_s4。

7. according to the control method of a kind of single-phase Cuk integrated form buck-boost inverter described in claim 1-6 any one, its It is characterised by: this inverter uses many controlled quentity controlled variables complex modulated strategy, i.e. modulation circuit to contain multiple controlled quentity controlled variable: S_a、S_bAnd S_c； Wherein, S_aIt is used for controlling the sine degree of output voltage, S_bPositive-negative polarity for alternating voltage judges signal, and S_cStraight for controlling Stream busbar voltage, to meet inversion required voltage condition, S_aThe absolute value exported by output-voltage loop actuator and carrier signal warp Produce after modulation circuit handing-over, and S_cOutput and carrier signal by busbar voltage ring actuator are modulated after circuit joins and produce, The two carrier signal is identical, can be asymmetric triangular wave, front along sawtooth waveforms or back edge sawtooth waveforms, based on upper State three associated control signals, can be obtained, by logical operations, the driving signal S that inverter finally needs further₁-S₄。

The control method of a kind of single-phase Cuk integrated form buck-boost inverter the most according to claim 7, it is characterised in that: Described inverter work process in each switch periods of sinusoidal modulation wave positive half-wave includes following three kinds of mode:

(1) mode 1, t₀-t₁: t₀Before moment, S₂And S₄Conducting, L₁、L₂Because being respectively subjected to backward voltage (U_C2-U_in) and U_C1 And linear discharge；At t₀Moment, S₂Turn off, S₁Conducting, to t₁In the moment, mode 1 terminates；In this mode, for Cuk liter Laminate section, diode D₁Conducting, supply voltage is all added to input inductance L₁On, inductive current i_L1(t) linear increase, meanwhile, Due to electric capacity C₂Electric discharge, outputting inductance L₂Electric current i_L2Also in linear increase；

(2) mode 2, t₁-t₂: t₁Moment, S₄Turn off, S₃Conducting, to t₂In the moment, mode 2 terminates；Cuk is boosted Part, D₁、D₂Conducting, L₁、L₂It is still subject to forward voltage U_in(U_C2-U_C1), electric current i_L1(t)、i_L2T () continues linear rise；

(3) mode 3, t₂-t₃: t₂Moment, S₁Turn off, S₂Conducting, to t₃In the moment, mode 3 terminates, next switch week Phase, repeat said process；For Cuk boosting part, D₁、D₂Conducting, electric current i_L1(t)、i_L2T () passes through D_s2、D_s4 Afterflow, inductance L₁Energy storage to electric capacity C₂Transfer, now L₁、L₂Bear backward voltage (U_C2-U_in) and U_C1, i_L1(t)、i_L2(t) Linear reduction.

The control method of a kind of single-phase Cuk integrated form buck-boost inverter the most according to claim 8, it is characterised in that: The voltage transfer ratio of described inverterM in formula_spwmRatio, D is modulated for inverter_boostBoost for Cuk The dutycycle of part.

10. a single-phase Cuk integrated form buck-boost inverter control system, it is characterised in that: include that claim 1-6 such as is appointed Anticipate a described single-phase Cuk integrated form buck-boost inverter.