CN104578880A - DC-AC conversion circuit and control method thereof - Google Patents
DC-AC conversion circuit and control method thereof Download PDFInfo
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- CN104578880A CN104578880A CN201510024386.4A CN201510024386A CN104578880A CN 104578880 A CN104578880 A CN 104578880A CN 201510024386 A CN201510024386 A CN 201510024386A CN 104578880 A CN104578880 A CN 104578880A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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Abstract
The invention discloses a DC-AC conversion circuit. The DC-AC conversion circuit comprises a first DC source, a second DC source, a third DC source, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a third switching tube, a fourth switching tube, or a third diode, a fourth diode, an inverter bridge and an output filter inductor. The invention further discloses a control method of the DC-AC conversion circuit. According to the DC-AC conversion circuit and the control method of the DC-AC conversion circuit, different voltage sections of the inverter bridge can be used for starting a working mode, the DC input voltage is fully utilized, the connecting and disconnecting stress of all elements in an inverter bridge loop can be lowered, and the switching loss is lowered; the working frequency or efficiency of the inverter bridge loop can be better improved, hence, the power density is improved and the size is decreased; meanwhile, the input DC sources can be reasonably arranged, and the power equalization of the input sources is achieved.
Description
Technical field
The present invention relates to Switching Power Supply, particularly a kind of DC-AC conversion circuit and control method.
Background technology
In existing DC converting application scenario, as mesohigh inverter, power amplifier etc., when direct current (DC) the source voltage of input needs multiple series connection to reach high pressure, and then busbar voltage is carried out step-down inversion or conversion, so the loss of power tube is larger.Therefore be necessary to design a kind of new circuit, by rational proportion and the suitable control of input voltage platform, simultaneously in different voltage sections from different voltage platform afterflows, obtain higher cost performance.
Summary of the invention
Main purpose of the present invention is for the deficiencies in the prior art, provides a kind of new DC-AC conversion circuit and control method.
For achieving the above object, the present invention is by the following technical solutions:
A kind of DC-AC conversion circuit, comprises the first to the 3rd DC source, first to fourth electric capacity, the 3rd to the 4th switching tube, inverter bridge, output inductor;
Wherein, described first to the 3rd DC source is connected in series, first to the 3rd electric capacity is connected in parallel on the two ends of the first to the 3rd DC source respectively, described inverter bridge comprises the first to second switch pipe, 5th to the 8th open pipe, the drain electrode of the first switching tube is connected with the anode of the positive pole of the 3rd electric capacity and the 3rd DC source, the source electrode of the first switching tube is connected with the drain electrode of the 3rd switching tube, the source electrode of the 3rd switching tube is connected with the negative pole of the 3rd electric capacity, the source electrode of the 7th switching tube is connected with the source electrode of the 4th switching tube, the drain electrode of the 7th switching tube is connected with the source electrode of the 5th switching tube, and be connected with one end of output loading, the drain electrode of the 4th switching tube is connected with the negative terminal of the first DC source, the drain electrode of the 5th switching tube is connected with the drain electrode of the 3rd switching tube, the drain electrode of the 6th switching tube is connected with the drain electrode of the 3rd switching tube, the source electrode of the 6th switching tube is connected with the drain electrode of the 8th switching tube, and be connected with the input of described output inductor, the drain electrode of the 8th switching tube is connected with the source electrode of the 4th switching tube and the drain electrode of second switch pipe, the source electrode of second switch pipe is connected with the negative terminal of the second DC source, one end of 4th electric capacity is connected with the output of described output inductor, the other end of the 4th electric capacity is connected with the drain electrode of the source electrode of the 5th switching tube and the 7th switching tube.
Wherein, the first to the 8th switching tube is the high-speed semiconductor switch that can control its break-make with drive singal.
A kind of DC-AC conversion circuit, comprises multiple described circuit and exports or single channel series connection output to form multiple power supplies.
A kind of DC-AC conversion circuit, comprises the first to the 3rd DC source, first to fourth electric capacity, the 3rd to the 4th diode, inverter bridge, output inductor;
Wherein, described first to the 3rd DC source is connected in series, first to the 3rd electric capacity is connected in parallel on the two ends of the first to the 3rd DC source respectively, described inverter bridge comprises the first to second switch pipe, 5th to the 8th open pipe, the drain electrode of the first switching tube is connected with the anode of the positive pole of the 3rd electric capacity and the 3rd DC source, the source electrode of the first switching tube is connected with the negative electrode of the 3rd diode, the anode of the 3rd diode is connected with the negative pole of the 3rd electric capacity, the source electrode of the 7th switching tube is connected with the anode of the 4th diode, the drain electrode of the 7th switching tube is connected with the source electrode of the 5th switching tube, and be connected with one end of output loading, the negative electrode of the 4th diode is connected with the negative terminal of the first DC source, the drain electrode of the 5th switching tube is connected with the negative electrode of the 3rd diode, the drain electrode of the 6th switching tube is connected with the negative electrode of the 3rd diode, the source electrode of the 6th switching tube is connected with the drain electrode of the 8th switching tube, and be connected with the input of described output inductor, the drain electrode of the 8th switching tube is connected with the anode of the 4th diode and the drain electrode of second switch pipe, the source electrode of second switch pipe is connected with the negative terminal of the second DC source, one end of 4th electric capacity is connected with the output of described output inductor, the other end of the 4th electric capacity is connected with the drain electrode of the source electrode of the 5th switching tube and the 7th switching tube.
Wherein, first, second, the 5th to the 8th switching tube is the high-speed semiconductor switch that can control its break-make with drive singal.
A kind of DC-AC conversion circuit, comprises multiple described circuit and exports or single channel series connection output to form multiple power supplies.
A kind of control method of the first DC-AC conversion circuit aforementioned, wherein according to the level relationship of DC source input voltage and inverter output voltage, be six regions by operating volume definition: when output voltage is true amplitude, amplitude is referred to as 1st district lower than the region of the first DC source input voltage, higher than the first DC source input voltage, be referred to as 2nd district lower than the region of the first to the second DC source input voltage sum, higher than the first to the second DC source input voltage sum, be referred to as 3rd district lower than the region of the first to the 3rd DC source input voltage sum; When output voltage is for negative amplitude, amplitude absolute value is referred to as 4th district lower than the region of the first DC source input voltage absolute value, higher than the first DC source input voltage absolute value, be referred to as 5th district lower than the region of the first to the second DC source input voltage absolute value sum, higher than the first to the second DC source input voltage absolute value sum, be referred to as 6th district lower than the region of the first to the 3rd DC source input voltage absolute value sum;
When output voltage is in 1st district or 4th district, the 3rd to the 4th switching tube normal open, the 5th to the 8th carries out work according to H bridge control method; When output voltage is in 2nd district or 5th district, 3rd switching tube normal open, second switch pipe carries out PWM control, the 5th, the 8th switching tube normal open or the 6th, the 7th switching tube normal open, when second switch pipe is closed, by the 4th switching tube from the first DC source input voltage afterflow platform afterflow; When output voltage is in 3rd district or 6th district, second switch pipe normal open, first switching tube carries out PWM control, five, the 8th switching tube normal open or the 6th, the 7th switching tube normal open, when the first switching tube is closed, by the afterflow platform afterflow of the 3rd switching tube from the first to the second DC input voitage sum;
Washability ground, when afterflow, also can close the 3rd switching tube or the 4th switching tube and reach afterflow object by opening the 5th and the 6th switching tube.
Preferably, the first to the 3rd DC source input voltage, than being 2.3-2.7:2.8-3.2:3.3-3.7, is more preferred from 2.5:3:3.5.
A kind of control method of aforementioned the second DC-AC conversion circuit, wherein according to the level relationship of DC source input voltage and inversion output AC voltage, be six regions by operating volume definition: when output voltage is true amplitude, amplitude is referred to as 1st district lower than the region of the first DC source input voltage, higher than the first DC source input voltage, lower than first and the 3rd the region of DC source input voltage sum be referred to as 2nd district, higher than first with the 3rd DC source input voltage sum, be referred to as 3rd district lower than the region of the first to the 3rd DC source input voltage sum; When output voltage is for negative amplitude, amplitude absolute value is referred to as 4th district lower than the region of the first DC source input voltage absolute value, higher than the first DC source input voltage absolute value, lower than first and the 3rd the region of DC source input voltage absolute value sum be referred to as 5th district, higher than first with the 3rd DC source input voltage absolute value sum, be referred to as 6th district lower than the region of the first to the 3rd DC source input voltage absolute value sum;
When output voltage is in 1st district or 4th district, the 3rd to the 4th diode is by forward bias voltage conducting, and the 5th to the 8th carries out work according to H bridge control method; When output voltage is in 2nd district or 5th district, 4th diode current flow, the first switching tube carries out PWM control, the 5th, the 8th switching tube normal open or the 6th, the 7th switching tube normal open, when the first switching tube is closed, by the 3rd diode from the first DC source input voltage afterflow platform afterflow; When output voltage is in 3rd district or 6th district, first switching tube normal open, second switch pipe carries out PWM control, five, the 8th switching tube normal open or the 6th, the 7th switching tube normal open, when second switch pipe is closed, by the afterflow platform afterflow of the 4th diode from the first to the second DC input voitage sum;
Washability ground, when afterflow, also can by opening the 5th and the 6th switching tube to reach afterflow object.
Preferably, the first to the 3rd DC source input voltage, than being 2.3-2.7:2.8-3.2:3.3-3.7, is more preferred from 2.5:3:3.5.
Beneficial effect of the present invention:
According to DC-AC conversion circuit of the present invention, the different voltage sections of inverter bridge can be utilized to open mode of operation, make full use of the voltage of direct current input, in reduction inverter bridge loop, each element opens and turns off stress, reduction switching loss; The operating frequency contributing to inverter circuit improves or efficiency raising; Thus improve power density and reduce volume.Also by the reasonable disposition to input direct-current source, the power-sharing of input source can be realized simultaneously; Circuit of the present invention has a clear superiority in the inverter or power amplifier of mesohigh.
Utilize the voltage transitions driving the method for different capacity switching tube work to realize polymorphic output at times, DC input voitage characteristic can be made full use of and obtain greater efficiency.
Utilize the different inversion mode of operations of reasonable input voltage proportioning and inverter bridge circuit, farthest can utilize the voltage of DC source, reduce the working loss of the main element of inverter circuit, also reduce the switching loss of element in inverter bridge circuit simultaneously, thus raise the efficiency and power density.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of DC-AC conversion circuit embodiments one of the present invention;
Fig. 2 is embodiment of the present invention inversion working region mode division schematic diagram;
Fig. 3 is embodiment of the present invention inverter bridge PWM driver' s timing schematic diagram;
Fig. 4 is the circuit diagram of DC-AC conversion circuit embodiments two of the present invention.
Embodiment
Below embodiments of the present invention are elaborated.It is emphasized that following explanation is only exemplary, instead of in order to limit the scope of the invention and apply.
Embodiment one
DC-AC conversion circuit as shown in Figure 1, comprising: the first to the 3rd DC source DC1, DC2, DC3; First to fourth electric capacity C1, C2, C3, C4, wherein first to the 3rd electric capacity C1, C2, C3 is filtering storage capacitor, and the 4th electric capacity C4 is output filter capacitor; 3rd to the 4th switching tube Q3, Q4, it is two continued flow switch pipes; Inverter bridge; And output inductor L1.In addition, translation circuit is also equipped with necessary driver and controller.
In this DC-AC conversion circuit, first to the 3rd DC source DC1, DC2, DC3 is connected in series, first to the 3rd electric capacity C1, C2, C3 is connected in parallel on the first to the 3rd DC source DC1 respectively, DC2, the two ends of DC3, inverter bridge comprises the first to second switch pipe Q1, Q2, 5th to the 8th open pipe Q5, Q6, Q7, Q8, the drain electrode of the first switching tube Q1 is connected with the anode of the positive pole of the 3rd electric capacity C3 and the 3rd DC source DC3, the source electrode of the first switching tube Q1 is connected with the drain electrode of the 3rd switching tube Q3, the source electrode of the 3rd switching tube Q3 is connected with the negative pole of the 3rd electric capacity C3, the source electrode of the 7th switching tube Q7 is connected with the source electrode of the 4th switching tube Q4, the drain electrode of the 7th switching tube Q7 is connected with the source electrode of the 5th switching tube Q5, and be connected with one end of output loading R, the drain electrode of the 4th switching tube Q4 is connected with the negative terminal of the first DC source DC1, the drain electrode of the 5th switching tube Q5 is connected with the drain electrode of the 3rd switching tube Q3, the drain electrode of the 6th switching tube Q6 is connected with the drain electrode of the 3rd switching tube Q3, the source electrode of the 6th switching tube Q6 is connected with the drain electrode of the 8th switching tube Q8, and be connected with the input of output inductor L1, the drain electrode of the 8th switching tube Q8 is connected with the drain electrode of the source electrode of the 4th switching tube Q4 and second switch pipe Q2, the source electrode of second switch pipe Q2 is connected with the negative terminal of the second DC source DC2, one end of 4th electric capacity C4 is connected with the output of output inductor L1, the other end of the 4th electric capacity C4 is connected with the drain electrode of the source electrode of the 5th switching tube Q5 and the 7th switching tube Q7.In a preferred embodiment, the first to the 3rd DC source input voltage, than being 2.3-2.7:2.8-3.2:3.3-3.7, is more preferred from 2.5:3:3.5.
In order to discuss conveniently, suppose the first to the 3rd DC source DC1, the DC input voitage value of DC2, DC3 is designated as V1, V2, V3 respectively, three's sum the highest bus (+BUS ,-BUS) voltage needed for inversion is Vbus; Vloss is counted in the miscellaneous pressure drop of circuit in reversals and switching elements conductive pressure drop; D be inversion pwm signal open duty ratio; Then the essence of the transformation relation of reduction voltage circuit is Vout=(V-Vloss) * D, i.e. Vout1=(V1-Vloss) * D, Vout2=(V1+V2-Vloss) * D, Vout3=(V1+V2+V3-Vloss) * D; Namely step-down process is carried out to the voltage before conversion.Be Vbus from the maximum instantaneous amplitude of above known output voltage, simultaneously owing to there being the 5th to the 8th open pipe Q5 in this translation circuit, Q6, the existence of Q7, Q8, forms typical " H " bridge, therefore mean that the polarity of the voltage of output can overturn, therefore, if certain point of output is reference zero, so output voltage can just can be born.
Have typicalness to discuss, we select common string ripple to be example, but are applicable to voltage waveform of the present invention and are not limited thereto.As shown in Figure 2, the waveform exported when needing inversion be in positive half wave 1. region time, now switching tube Q1, the drive singal of Q2, Q5 is low always, namely turns off, switching tube Q3 always, and the drive singal of Q4, Q7 is high level, i.e. conducting always always; Switching tube Q6 conducting when the high level signal of PWM drive singal; Electric current from input power through switching tube Q3, Q6, inductance L 1, load R, switching tube Q7, Q4 forms loop, when the PWM drive singal of switching tube Q6 becomes low level signal time, electric current through the anti-of switching tube Q8 and diode (also can utilize the PWM drive singal conducting with switching tube Q6 complementation), inductance L 1, load R, switching tube Q7 form continuous current circuit; When this region, according to the sampled signal feedback processing of controller, the size of adjustment duty ratio D.If export waveform be in negative half-wave 4. region time, now switching tube Q1, the drive singal of Q2, Q7 is low always, namely turns off, switching tube Q3 always, and the drive singal of Q5, Q4 is high level, i.e. conducting always always; Switching tube Q8 conducting when the high level signal of PWM drive singal; Electric current from input power through switching tube Q3, Q5, inductance L 1, load R, switching tube Q8, Q4 forms loop, and when the PWM drive singal of switching tube Q8 becomes low level signal time, electric current is through switching tube Q5, inductance L 1, load R, L3, the anti-also diode (also can utilize the PWM drive singal conducting with Q5 complementation) of switching tube Q6 forms continuous current circuit; Comprehensive overall process, namely this period carries out step-down process to Vin, Vout=(V1-Vloss) * D; Simultaneously in this region, because other high voltage source of input does not need participation work, reduce so the switching loss participating in the switching tube of work in circuit compares traditional high pressure.
When export waveform be in positive half wave 2. region time, now switching tube, the drive singal of switching tube Q5 is low always, namely turns off always; Switching tube Q3, the drive singal of Q6, Q7 is high level, i.e. conducting always always; Switching tube Q2 conducting when the high level signal of PWM drive singal, electric current from input power through switching tube Q3, Q6, inductance L 1, load R, switching tube Q7, Q2 form loop, when the PWM drive singal of switching tube Q2 becomes low level signal time, anti-also diode conducting afterflow by forward bias (also can utilize the PWM drive singal conducting with switching tube Q2 complementation) of Simultaneous Switching pipe Q4; Electric current from input power through switching tube Q3, Q6, inductance L 1, load R, switching tube Q7, Q4 form continuous current circuit; When this region, according to the sampled signal feedback processing of controller, the size of adjustment duty ratio D, meets the control to output voltage.In like manner, when inversion export waveform be in positive half wave 5. region time, now switching tube, the drive singal of switching tube Q7 is low always, namely turns off always; Switching tube Q3, the drive singal of Q5, Q8 is high level, i.e. conducting always always; Switching tube Q2 conducting when the high level signal of PWM drive singal, electric current from input power through switching tube Q3, Q5, load R, inductance L 1, switching tube Q8, Q2 form loop, when the PWM drive singal of switching tube Q2 becomes low level signal time, anti-also diode conducting afterflow by forward bias (also can utilize the PWM drive singal conducting with switching tube Q2 complementation) of Simultaneous Switching pipe Q4; Electric current through switching tube Q3, Q6, inductance L 1, load R, switching tube Q7, Q4 form continuous current circuit; .Comprehensive overall process, namely this period can be regarded as and carries out step-down process to Vbus, i.e. Vout=(V1-Vloss)+(V2-Vloss) * D; In this region, the platform of its afterflow voltage is V1, and this type of traditional inverter bridge afterflow voltage is 0, and voltage jump scope reduces greatly comparatively speaking, and the switching loss of switching tube Q2 reduces a lot.
In addition, 2. 1. the waveform exported when inversion be in positive half wave, 2. 1. juncture area or be in positive half wave 3. 4., 4. 3. juncture area time, can adopt when switching tube Q1 opens with region 2. or the 4. consistent sequential control method in region; Have no progeny when switching tube Q1 closes, now not using Vin as afterflow platform, therefore, on-off switching tube Q3 or switching tube Q5, to cut off the path with Vin; Simultaneous Switching pipe Q4, Q6 maintain conducting and carry out afterflow, Vout=(Vbus-Vloss) * D.Therefore interval is shorter, and relational graph display only indicates this mode of operation and transient process in figure 3.
When input voltage vin value equals Vbus, namely without the need to starting boosting; Now switching tube Q1 is without the need to open-minded, and its inversion work is consistent with traditional H bridge.Describe with regard to no longer burdensome at this.
In sum, when input voltage vin value is lower than Vbus, when namely needing the booster circuit starting prime, adopt this change-over circuit, simultaneously according to relevant operation control method, just obviously can reduce the loss of booster circuit, make full use of the voltage of DC source, the switching loss of rear class inverter bridge can be lowered again simultaneously, so be conducive to the raising of inverter bridge PWM frequency, namely whole circuit realiration high frequency, reduces the volume of inverter, improves power density.By calculating and emulating, when the voltage of DC source is between 0.333 to 0.866 of busbar voltage (Vbus) the highest needed for inversion time, start corresponding mode of operation and reduce achieving noticeable achievement of switching loss.
Embodiment two
Be another embodiment of the present invention as shown in Figure 4, the difference of itself and embodiment one is, instead of the switching tube Q3 of embodiment one, instead of the Q4 of embodiment one with diode D4 in circuit with diode D3.In the course of work, when respective diode needs forward afterflow or conducting, it can be subject to forward bias voltage poor and natural conducting, therefore, when output has reactive current (voltage and electric current out of phase), diode D3, D4 can not afterflows, but by switching tube Q1, Q2 carries out afterflow, other part and embodiment one indistinction, states so again not tired.
In addition, on the basis of embodiment one and embodiment two, the present invention can also adopt multiple DC-AC conversion circuit as embodiment one and embodiment two to form multiple power supplies and export or single channel series connection exports, and reaches the object expanding power.
Switching tube in the present invention can be the high-speed semiconductor switch that all kinds of drive singal controls its break-make, and is not limited only to power semiconductor switch represented in figure.
Above content combines concrete/preferred embodiment further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; its execution mode that can also describe these makes some substituting or modification, and these substitute or variant all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. a DC-AC conversion circuit, is characterized in that, comprises the first to the 3rd DC source, first to fourth electric capacity, the 3rd to the 4th switching tube, inverter bridge, output inductor;
Wherein, described first to the 3rd DC source is connected in series, first to the 3rd electric capacity is connected in parallel on the two ends of the first to the 3rd DC source respectively, described inverter bridge comprises the first to second switch pipe, 5th to the 8th open pipe, the drain electrode of the first switching tube is connected with the anode of the positive pole of the 3rd electric capacity and the 3rd DC source, the source electrode of the first switching tube is connected with the drain electrode of the 3rd switching tube, the source electrode of the 3rd switching tube is connected with the negative pole of the 3rd electric capacity, the source electrode of the 7th switching tube is connected with the source electrode of the 4th switching tube, the drain electrode of the 7th switching tube is connected with the source electrode of the 5th switching tube, and be connected with one end of output loading, the drain electrode of the 4th switching tube is connected with the negative terminal of the first DC source, the drain electrode of the 5th switching tube is connected with the drain electrode of the 3rd switching tube, the drain electrode of the 6th switching tube is connected with the drain electrode of the 3rd switching tube, the source electrode of the 6th switching tube is connected with the drain electrode of the 8th switching tube, and be connected with the input of described output inductor, the drain electrode of the 8th switching tube is connected with the source electrode of the 4th switching tube and the drain electrode of second switch pipe, the source electrode of second switch pipe is connected with the negative terminal of the second DC source, one end of 4th electric capacity is connected with the output of described output inductor, the other end of the 4th electric capacity is connected with the drain electrode of the source electrode of the 5th switching tube and the 7th switching tube.
2. DC-AC conversion circuit as claimed in claim 1, it is characterized in that, the first to the 8th switching tube is the high-speed semiconductor switch that can control its break-make with drive singal.
3. a DC-AC conversion circuit, is characterized in that, comprises multiple circuit as claimed in claim 1 or 2 and exports or single channel series connection output to form multiple power supplies.
4. a DC-AC conversion circuit, is characterized in that, comprises the first to the 3rd DC source, first to fourth electric capacity, the 3rd to the 4th diode, inverter bridge, output inductor;
Wherein, described first to the 3rd DC source is connected in series, first to the 3rd electric capacity is connected in parallel on the two ends of the first to the 3rd DC source respectively, described inverter bridge comprises the first to second switch pipe, 5th to the 8th open pipe, the drain electrode of the first switching tube is connected with the anode of the positive pole of the 3rd electric capacity and the 3rd DC source, the source electrode of the first switching tube is connected with the negative electrode of the 3rd diode, the anode of the 3rd diode is connected with the negative pole of the 3rd electric capacity, the source electrode of the 7th switching tube is connected with the anode of the 4th diode, the drain electrode of the 7th switching tube is connected with the source electrode of the 5th switching tube, and be connected with one end of output loading, the negative electrode of the 4th diode is connected with the negative terminal of the first DC source, the drain electrode of the 5th switching tube is connected with the negative electrode of the 3rd diode, the drain electrode of the 6th switching tube is connected with the negative electrode of the 3rd diode, the source electrode of the 6th switching tube is connected with the drain electrode of the 8th switching tube, and be connected with the input of described output inductor, the drain electrode of the 8th switching tube is connected with the anode of the 4th diode and the drain electrode of second switch pipe, the source electrode of second switch pipe is connected with the negative terminal of the second DC source, one end of 4th electric capacity is connected with the output of described output inductor, the other end of the 4th electric capacity is connected with the drain electrode of the source electrode of the 5th switching tube and the 7th switching tube.
5. DC-AC conversion circuit as claimed in claim 1, is characterized in that, first, second, the 5th to the 8th switching tube is the high-speed semiconductor switch that can control its break-make with drive singal.
6. a DC-AC conversion circuit, is characterized in that, comprises multiple circuit as described in claim 4 or 5 and exports or single channel series connection output to form multiple power supplies.
7. the control method of the DC-AC conversion circuit as described in any one of claims 1 to 3, it is characterized in that, according to the level relationship of DC source input voltage and inverter output voltage, be six regions by operating volume definition: when output voltage is true amplitude, amplitude is referred to as 1st district lower than the region of the first DC source input voltage, higher than the first DC source input voltage, region lower than the first to the second DC source input voltage sum is referred to as 2nd district, higher than the first to the second DC source input voltage sum, region lower than the first to the 3rd DC source input voltage sum is referred to as 3rd district, when output voltage is for negative amplitude, amplitude absolute value is referred to as 4th district lower than the region of the first DC source input voltage absolute value, higher than the first DC source input voltage absolute value, be referred to as 5th district lower than the region of the first to the second DC source input voltage absolute value sum, higher than the first to the second DC source input voltage absolute value sum, be referred to as 6th district lower than the region of the first to the 3rd DC source input voltage absolute value sum,
When output voltage is in 1st district or 4th district, the 3rd to the 4th switching tube normal open, the 5th to the 8th carries out work according to H bridge control method; When output voltage is in 2nd district or 5th district, 3rd switching tube normal open, second switch pipe carries out PWM control, the 5th, the 8th switching tube normal open or the 6th, the 7th switching tube normal open, when second switch pipe is closed, by the 4th switching tube from the first DC source input voltage afterflow platform afterflow; When output voltage is in 3rd district or 6th district, second switch pipe normal open, first switching tube carries out PWM control, five, the 8th switching tube normal open or the 6th, the 7th switching tube normal open, when the first switching tube is closed, by the afterflow platform afterflow of the 3rd switching tube from the first to the second DC input voitage sum;
Washability ground, when afterflow, also can close the 3rd switching tube or the 4th switching tube and reach afterflow object by opening the 5th and the 6th switching tube.
8. the control method of DC-AC conversion circuit as claimed in claim 7, is characterized in that, the first to the 3rd DC source input voltage, than being 2.3-2.7:2.8-3.2:3.3-3.7, is more preferred from 2.5:3:3.5.
9. the control method of the DC-AC conversion circuit as described in any one of claim 4 to 6, it is characterized in that, according to the level relationship of DC source input voltage and inversion output AC voltage, be six regions by operating volume definition: when output voltage is true amplitude, amplitude is referred to as 1st district lower than the region of the first DC source input voltage, higher than the first DC source input voltage, lower than first and the 3rd the region of DC source input voltage sum be referred to as 2nd district, higher than first and the 3rd DC source input voltage sum, region lower than the first to the 3rd DC source input voltage sum is referred to as 3rd district, when output voltage is for negative amplitude, amplitude absolute value is referred to as 4th district lower than the region of the first DC source input voltage absolute value, higher than the first DC source input voltage absolute value, lower than first and the 3rd the region of DC source input voltage absolute value sum be referred to as 5th district, higher than first with the 3rd DC source input voltage absolute value sum, be referred to as 6th district lower than the region of the first to the 3rd DC source input voltage absolute value sum,
When output voltage is in 1st district or 4th district, the 3rd to the 4th diode is by forward bias voltage conducting, and the 5th to the 8th carries out work according to H bridge control method; When output voltage is in 2nd district or 5th district, 4th diode current flow, the first switching tube carries out PWM control, the 5th, the 8th switching tube normal open or the 6th, the 7th switching tube normal open, when the first switching tube is closed, by the 3rd diode from the first DC source input voltage afterflow platform afterflow; When output voltage is in 3rd district or 6th district, first switching tube normal open, second switch pipe carries out PWM control, five, the 8th switching tube normal open or the 6th, the 7th switching tube normal open, when second switch pipe is closed, by the afterflow platform afterflow of the 4th diode from the first to the second DC input voitage sum;
Washability ground, when afterflow, also can by opening the 5th and the 6th switching tube to reach afterflow object.
10. the control method of DC-AC conversion circuit as claimed in claim 9, is characterized in that, the first to the 3rd DC source input voltage, than being 2.3-2.7:2.8-3.2:3.3-3.7, is more preferred from 2.5:3:3.5.
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