CN104578880B - DC-AC conversion circuit and control method thereof - Google Patents
DC-AC conversion circuit and control method thereof Download PDFInfo
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- CN104578880B CN104578880B CN201510024386.4A CN201510024386A CN104578880B CN 104578880 B CN104578880 B CN 104578880B CN 201510024386 A CN201510024386 A CN 201510024386A CN 104578880 B CN104578880 B CN 104578880B
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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
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, such as mesohigh inverter, power amplifier etc., when the direct current (DC) of input
Source voltage needs multiple series connection to reach high pressure, then again busbar voltage is carried out blood pressure lowering inversion or conversion, so power tube
Loss is larger.It is therefore desirable to designing a kind of new circuit, can be by the rational proportion of input voltage platform and suitable
Control, simultaneously in different voltage sections from different voltage platform afterflows, obtain higher cost performance.
Content of the invention
Present invention is primarily targeted at being directed to the deficiencies in the prior art, provide a kind of new DC-AC conversion circuit
And control method.
For achieving the above object, the present invention employs the following technical solutions：
A kind of DC-AC conversion circuit, including the first to the 3rd DC source, first to fourth electric capacity, the 3rd to the 4th
Switching tube, inverter bridge, output inductor；
Wherein, the described first to the 3rd DC source is connected in series, and the first to the 3rd electric capacity is connected in parallel on first to the 3rd respectively
The two ends of DC source, described inverter bridge includes the first to second switch pipe, the 5th to the 8th switching tube, the drain electrode of first switch pipe
It is connected with the positive pole of the 3rd electric capacity and the anode of the 3rd DC source, the drain electrode phase of the source electrode of first switch pipe and the 3rd switching tube
Even, 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 and the source electrode phase of the 4th switching tube
Even, the drain electrode of the 7th switching tube is connected with the source electrode of the 5th switching tube, and is connected with one end of output loading, the 4th switching tube
Drain electrode is connected with the negative terminal of the first DC source, and the drain electrode of the 5th switching tube is connected with the drain electrode of the 3rd switching tube, the 6th switching tube
Drain electrode be 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 with described
The input of output inductor is connected, the source electrode of the 8th switching tube and the source electrode of the 4th switching tube and the drain electrode of second switch pipe
It is connected, the source electrode of second switch pipe is connected with the negative terminal of the second DC source, one end of the 4th electric capacity and described output inductor
Outfan be connected, the other end of the 4th electric capacity is connected with the source electrode of the 5th switching tube and the drain electrode of the 7th switching tube.
Wherein, the first to the 8th switching tube is can be switched with the high-speed semiconductor that drive signal controls its break-make.
A kind of DC-AC conversion circuit, including multiple described circuit to form multiple power supplies output or single channel string
Connection output.
A kind of DC-AC conversion circuit, including the first to the 3rd DC source, first to fourth electric capacity, the 3rd to the 4th
Diode, inverter bridge, output inductor；
Wherein, the described first to the 3rd DC source is connected in series, and the first to the 3rd electric capacity is connected in parallel on first to the 3rd respectively
The two ends of DC source, described inverter bridge includes the first to second switch pipe, the 5th to the 8th switching tube, the drain electrode of first switch pipe
It is connected with the positive pole of the 3rd electric capacity and the anode of the 3rd DC source, the negative electrode phase of the source electrode of first switch pipe and the 3rd diode
Even, 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 and the anode phase of the 4th diode
Even, the drain electrode of the 7th switching tube is connected with the source electrode of the 5th switching tube, and is connected with one end of output loading, the 4th diode
Negative electrode is connected with the negative terminal of the first DC source, and the drain electrode of the 5th switching tube is connected with the negative electrode of the 3rd diode, the 6th switching tube
Drain electrode be 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 with described
The input of output inductor is connected, the source electrode of the 8th switching tube and the anode of the 4th diode and the drain electrode of second switch pipe
It is connected, the source electrode of second switch pipe is connected with the negative terminal of the second DC source, one end of the 4th electric capacity and described output inductor
Outfan be connected, the other end of the 4th electric capacity is connected with the source electrode of the 5th switching tube and the drain electrode of the 7th switching tube.
Wherein, the first, second, the 5th to the 8th switching tube is the high-speed semiconductor that can control its break-make with drive signal
Switch.
A kind of DC-AC conversion circuit, including multiple described circuit to form multiple power supplies output or single channel string
Connection output.
A kind of control method of the first DC-AC conversion circuit aforementioned, wherein according to DC source input voltage with inverse
Become the level relationship of output voltage, operating volume definition is six regions：When output voltage is for true amplitude, amplitude is less than first
The region of DC source input voltage is referred to as 1st area, higher than the first DC source input voltage, less than the first to the second DC source input
The region of voltage sum is referred to as 2nd area, higher than the first to the second DC source input voltage sum, is less than the first to the 3rd DC source
The region of input voltage sum is referred to as 3rd area；When output voltage is negative amplitude, amplitude absolute value is less than the first DC source input
The region of absolute value of voltage be referred to as 4th area, higher than the first DC source input voltage absolute value, less than the first to the second DC source defeated
The region entering absolute value of voltage sum is referred to as 5th area, higher than the first to the second DC source input voltage absolute value sum, less than the
The region of one to the 3rd DC source input voltage absolute value sum is referred to as 6th area；
When output voltage is in 1st area or 4th area, the 3rd to the 4th switching tube normal open, the 5th to the 8th controls according to H bridge
Method is operated；When output voltage is in 2nd area or 5th area, the 3rd switching tube normal open, second switch pipe carries out PWM control,
Five, the 8th switching tube normal opens or the six, the 7th switching tube normal opens, 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 area or 6th area, second switch pipe normal open, the
One switching tube carries out PWM control, the five, the 8th switching tube normal opens or the six, the 7th switching tube normal opens, when first switch pipe closes
When closing, by the 3rd switching tube from the afterflow platform afterflow of the first to the second DC input voitage sum；
Washability ground, in afterflow it is also possible to close the 3rd switching tube or the 4th switching tube and by opening the 5th and the
Six switching tubes reach afterflow purpose.
Preferably, the first to the 3rd DC source input voltage is than for 2.3-2.7：2.8-3.2：3.3-3.7, more preferably 2.5：
3：3.5.
A kind of control method of aforementioned second DC-AC conversion circuit, wherein according to DC source input voltage with inverse
Become the level relationship of output AC voltage, operating volume definition is six regions：When output voltage is for true amplitude, amplitude is less than
The region of the first DC source input voltage is referred to as 1st area, higher than the first DC source input voltage, less than first with the 3rd DC source
The region of input voltage sum is referred to as 2nd area, higher than first and the 3rd DC source input voltage sum, straight to the 3rd less than first
The region of stream source input voltage sum is referred to as 3rd area；When output voltage is negative amplitude, amplitude absolute value is less than the first DC source
The region of input voltage absolute value is referred to as 4th area, higher than the first DC source input voltage absolute value, less than first with the 3rd direct current
The region of source input voltage absolute value sum is referred to as 5th area, higher than first and the 3rd DC source input voltage absolute value sum, low
It is referred to as 6th area in the region of the first to the 3rd DC source input voltage absolute value sum；
When output voltage is in 1st area or 4th area, the 3rd to the 4th diode is turned on by forward bias voltage, the 5th to
8th is operated according to H bridge control method；When output voltage is in 2nd area or 5th area, the 4th diode current flow, first opens
Close pipe and carry out PWM control, the five, the 8th switching tube normal opens or the six, the 7th switching tube normal opens, when first switch pipe is closed
When, by the 3rd diode from the first DC source input voltage afterflow platform afterflow；When output voltage is in 3rd area or 6th area,
First switch pipe normal open, second switch pipe carries out PWM control, and the five, the 8th switching tube normal opens or the six, the 7th switching tubes are normal
Logical, when second switch pipe is closed, continued from the afterflow platform of the first to the second DC input voitage sum by the 4th diode
Stream；
Washability ground, in afterflow it is also possible to reach afterflow purpose by opening the 5th and the 6th switching tube.
Preferably, the first to the 3rd DC source input voltage is than for 2.3-2.7：2.8-3.2：3.3-3.7, more preferably 2.5：
3：3.5.
Beneficial effects of the present invention：
According to the DC-AC conversion circuit of the present invention, the different voltage sections of available inverter bridge are opened mode of operation, are filled
Divide the voltage using direct current input, in reduction inversion bridge loop, each element opens and turn off stress, reduction switching loss；Help
Operating frequency in inverter circuit improves or efficiency improves；Thus improving power density and reducing volume.Can also lead to simultaneously
Cross the reasonable disposition to input direct-current source, realize the power-sharing of input source；The circuit of the present invention mesohigh inverter or
Have a clear superiority in person's power amplifier.
Realize the voltage conversion of polymorphic output using the method driving the work of different capacity switching tube at times, can be abundant
Obtain greater efficiency using DC input voitage characteristic.
Using the different inversion mode of operations of reasonable input voltage proportioning and inversion bridge circuit, can farthest utilize
The voltage of DC source, reduces the working loss of the main element of inverter circuit, also reduces the opening of element in inversion bridge circuit simultaneously
Close loss, thus improving efficiency and power density.
Brief description
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.
Specific embodiment
Hereinafter embodiments of the present invention are elaborated.It is emphasized that what the description below was merely exemplary,
Rather than in order to limit the scope of the present invention and its application.
Embodiment one
DC-AC conversion circuit as shown in Figure 1, including：First to the 3rd DC source DC1, DC2, DC3；First to
4th electric capacity C1, C2, C3, C4, wherein first to the 3rd electric capacity C1, C2, C3 are 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.
Additionally, translation circuit is further 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, and first to
Three electric capacity C1, C2, C3 are connected in parallel on the two ends of first to the 3rd DC source DC1, DC2, DC3 respectively, and inverter bridge includes first to
Two switching tube Q1, Q2, the 5th to the 8th switching tube Q5, Q6, Q7, Q8, the drain electrode of first switch pipe Q1 is with the 3rd electric capacity C3 just
The anode of pole and the 3rd DC source DC3 is connected, and the source electrode of first switch pipe Q1 is connected with the drain electrode of the 3rd switching tube Q3, and the 3rd
The source electrode of switching tube Q3 is connected with the negative pole of the 3rd electric capacity C3, the source electrode of the 7th switching tube Q7 and the source electrode phase of the 4th switching tube Q4
Even, the drain electrode of the 7th switching tube Q7 is connected with the source electrode of the 5th switching tube Q5, and is connected with one end of output loading R, and the 4th opens
The drain electrode closing pipe Q4 is connected with the negative terminal of the first DC source DC1, the drain electrode draining with the 3rd switching tube Q3 of the 5th switching tube Q5
It is connected, 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 and the 8th switchs
The drain electrode of pipe Q8 is connected, and is connected with the input of output inductor L1, the source electrode of the 8th switching tube Q8 and the 4th switching tube
The drain electrode of the source electrode of Q4 and second switch pipe Q2 is connected, and 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 outfan of output inductor L1, the other end of the 4th electric capacity C4 and the 5th switching tube Q5
Source electrode and the 7th switching tube Q7 drain electrode be connected.In a preferred embodiment, the first to the 3rd DC source input voltage ratio is
2.3-2.7：2.8-3.2：3.3-3.7, more preferably 2.5：3：3.5.
For discussion purposes it is assumed that the DC input voitage value of first to the 3rd DC source DC1, DC2, DC3 is designated as respectively
V1, V2, V3, three's sum is highest bus (+BUS ,-BUS) voltage needed for inversion is Vbus；Circuit in reversals is miscellaneous
Pressure drop and switching elements conductive pressure drop are calculated as Vloss；D opens dutycycle for inversion pwm signal；Then the conversion of reduction voltage circuit is closed
The essence of system is Vout=(V-Vloss) * D, i.e. Vout1=(V1-Vloss) * D, Vout2=(V1+V2-Vloss) * D,
Vout3=(V1+V2+V3-Vloss) * D；Blood pressure lowering process is carried out to the voltage before conversion.It will be apparent from the above that output voltage is
Big instantaneous amplitude is Vbus, simultaneously because there being the 5th to the 8th switching tube Q5 in this translation circuit, the presence of Q6, Q7, Q8, and formed
One typical " H " bridge, therefore, it is intended that the polarity of the voltage of outfan can overturn, therefore, if certain of outfan
Point is reference zero, then output voltage can just can be born.
In order to discuss with typicality, as a example we select common string ripple, but the voltage waveform being applied to the present invention does not limit
In this.As shown in Fig. 2 when the waveform needing inversion output is in positive half-wave 1. region, now switching tube Q1, Q2, Q5's
Drive signal is low always, turns off always, switching tube Q3, and the drive signal of Q4, Q7 is high level always, that is, constantly on；
Switching tube Q6 turns in the high level signal of PWM drive signal；Electric current is from input power through switching tube Q3, Q6, inductance
L1, loads R, and switching tube Q7, Q4 form loop, when the PWM drive signal of switching tube Q6 is changed into low level signal, electric current warp
Cross the anti-of switching tube Q8 diode (can also be using the PWM drive signal conducting complementary with switching tube Q6), inductance L1, bear
Carry R, switching tube Q7 forms continuous current circuit；When this region, according to the sampled signal feedback processing of controller, adjust duty
Size than D.If output waveform be in negative half-wave 4. region when, now switching tube Q1, the drive signal of Q2, Q7 is always
For low, turn off always, switching tube Q3, the drive signal of Q5, Q4 is high level always, that is, constantly on；Switching tube Q8 is in PWM
Turn on when the high level signal of drive signal；Electric current loads R, switch from input power through switching tube Q3, Q5, inductance L1
Pipe Q8, Q4 form loop, and when the PWM drive signal of switching tube Q8 is changed into low level signal, electric current is through switching tube Q5, electricity
Sense L1, loads R, and the anti-and diode (can also be using the PWM drive signal conducting complementary with Q5) of L3, switching tube Q6 is formed
Continuous current circuit；From the point of view of comprehensive overall process, that is, this period is that Vin is carried out with blood pressure lowering process, Vout=(V1-Vloss) * D；Exist simultaneously
This region, the other high voltage power supplies due to input need not participate in work, so participating in opening of the switching tube of work in circuit
Close loss and compare traditional high pressure minimizing.
When the waveform of output is in positive half-wave 2. region, now switching tube, the drive signal of switching tube Q5 is always
Low, turn off always；Switching tube Q3, the drive signal of Q6, Q7 is high level always, that is, constantly on；Switching tube Q2 drives in PWM
Turn on when the high level signal of dynamic signal, electric current loads R, switching tube from input power through switching tube Q3, Q6, inductance L1
Q7, Q2 form loop, when the PWM drive signal of switching tube Q2 is changed into low level signal, Simultaneous Switching pipe Q4 anti-two
Pole pipe is subject to forward bias (can also be using the PWM drive signal conducting complementary with switching tube Q2) to turn on afterflow；Electric current from
Input power, through switching tube Q3, Q6, inductance L1, loads R, and switching tube Q7, Q4 form continuous current circuit；When this region,
According to the sampled signal feedback processing of controller, adjust the size of dutycycle D, meet the control to output voltage.In the same manner, when inverse
Become output waveform be in positive half-wave 5. region when, now switching tube, the drive signal of switching tube Q7 is low, that is, always always
Turn off；Switching tube Q3, the drive signal of Q5, Q8 is high level always, that is, constantly on；Switching tube Q2 is in PWM drive signal
Turn on when high level signal, electric current loads R, inductance L1, switching tube Q8, Q2 are formed from input power through switching tube Q3, Q5
Loop, when the PWM drive signal of switching tube Q2 is changed into low level signal, the anti-and diode of Simultaneous Switching pipe Q4 is by forward direction
Bias (can also be using the PWM drive signal conducting complementary with switching tube Q2) and turn on afterflow；Electric current through switching tube Q3,
Q6, inductance L1, load R, and switching tube Q7, Q4 form continuous current circuit；.From the point of view of comprehensive overall process, that is, this period can be regarded as right
Vbus carries out blood pressure lowering process, i.e. Vout=(V1-Vloss)+(V2-Vloss) * D；In this region, the platform of its afterflow voltage is
V1, traditional such inverter bridge afterflow voltage is 0, and comparatively voltage jump scope greatly reduces, and the switch of switching tube Q2 damages
Consumption reduces a lot.
Additionally, when 2. 1. the waveform of inversion output be in positive half-wave, 2. 1. juncture area or be in positive half-wave 3. 4., 4.
3. during juncture area, when switching tube Q1 opens can using with region 2. or the 4. consistent sequential control method in region；When opening
Close pipe Q1 and close and have no progeny, now not using Vin as afterflow platform, therefore, on-off switching tube Q3 or switching tube Q5, with cut off with
The path of Vin；Simultaneous Switching pipe Q4, Q6 maintain conducting to carry out afterflow, Vout=(Vbus-Vloss) * D.Therefore interval is relatively
Short, relational graph shows and only indicates this mode of operation and transient process in figure 3.
When input voltage vin value is equal to Vbus, boosting need not be started；Now switching tube Q1 need not open, its inversion
Work is consistent with traditional H bridge.Here just no longer burden narration.
In sum, when input voltage vin value is less than Vbus, that is, when needing the booster circuit starting prime, using this
Change-over circuit, simultaneously according to related operation control method it is possible to significantly reduce the loss of booster circuit, makes full use of direct current
The voltage in source, can lower the switching loss of rear class inverter bridge, so being conducive to the raising of inverter bridge PWM frequency, that is, simultaneously again
Whole circuit realiration high frequency, reduces the volume of inverter, improves power density.By calculating and emulating, when the electricity of DC source
When pressure is between 0.333 to 0.866 of highest busbar voltage (Vbus) needed for inversion, starts corresponding mode of operation and reduce
The achieving noticeable achievement of switching loss.
Embodiment two
It is another embodiment of the present invention as shown in Figure 4, it is with the difference of embodiment one, uses two poles in circuit
Pipe D3 instead of the switching tube Q3 of embodiment one, instead of the Q4 of embodiment one with diode D4.In work process, corresponding two
When pole pipe needs positive afterflow or conducting, it can be turned on naturally by forward bias voltage difference, therefore when output has or not
During work(electric current (voltage and electric current out of phase), diode D3, D4 are unable to afterflow, but pass through switching tube Q1, and Q2 carries out afterflow,
Other parts and embodiment one indistinction, so do not tire out again state.
In addition, on the basis of embodiment one and embodiment two, the present invention can also be using multiple as embodiment one and real
The DC-AC conversion circuit applying example two, to form multiple power supplies output or single channel series connection output, reaches the mesh expanding power
's.
Switching tube in the present invention can be that all kinds of drive signals control the high-speed semiconductor of its break-make to switch, and not only
It is limited to the power semiconductor switch represented by figure.
Above content is to further describe it is impossible to recognize with reference to concrete/preferred embodiment made for the present invention
Determine the present invention be embodied as be confined to these explanations.For general technical staff of the technical field of the invention,
Without departing from the inventive concept of the premise, it can also make some replacements or modification to the embodiment that these have described that,
And these substitute or variant all should be considered as belonging to protection scope of the present invention.
Claims (12)
1. a kind of DC-AC conversion circuit it is characterised in that include the first to the 3rd DC source, first to fourth electric capacity, the
Three to the 4th switching tubes, inverter bridge, output inductor；
Wherein, the described first to the 3rd DC source is connected in series, and the first to the 3rd electric capacity is connected in parallel on the first to the 3rd direct current respectively
The two ends in source, described inverter bridge includes the first to second switch pipe, the 5th to the 8th switching tube, the drain electrode of first switch pipe and the
The anode of the positive pole of three electric capacity and the 3rd DC source is connected, and the source electrode of first switch pipe 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, and 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 is connected with one end of output loading, the leakage of the 4th switching tube
Pole is connected with the negative terminal of the first DC source, and the drain electrode of the 5th switching tube is connected with the drain electrode of the 3rd switching tube, the 6th switching tube
Drain electrode is connected with the drain electrode of the 3rd switching tube, and the source electrode of the 6th switching tube is connected with the drain electrode of the 8th switching tube, and defeated with described
The input going out filter inductance is connected, the drain electrode phase of source electrode with the 4th switching tube of the source electrode of the 8th switching tube and second switch pipe
Even, the source electrode of second switch pipe is connected with the negative terminal of the second DC source, one end of the 4th electric capacity and described output inductor
Outfan is connected, and the other end of the 4th electric capacity is connected with the source electrode of the 5th switching tube and the drain electrode of the 7th switching tube.
2. DC-AC conversion circuit as claimed in claim 1 is it is characterised in that the first to the 8th switching tube is to use
Drive signal controls the high-speed semiconductor of its break-make to switch.
3. a kind of DC-AC conversion circuit is it is characterised in that include multiple circuit as claimed in claim 1 or 2 to be formed
Multiple power supplies output or single channel series connection output.
4. a kind of DC-AC conversion circuit it is characterised in that include the first to the 3rd DC source, first to fourth electric capacity, the
Three to the 4th diodes, inverter bridge, output inductor；
Wherein, the described first to the 3rd DC source is connected in series, and the first to the 3rd electric capacity is connected in parallel on the first to the 3rd direct current respectively
The two ends in source, described inverter bridge includes the first to second switch pipe, the 5th to the 8th switching tube, the drain electrode of first switch pipe and the
The anode of the positive pole of three electric capacity and the 3rd DC source is connected, and the source electrode of first switch pipe 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, and 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 is connected with one end of output loading, the moon of the 4th diode
Pole is connected with the negative terminal of the first DC source, and the drain electrode of the 5th switching tube is connected with the negative electrode of the 3rd diode, the 6th switching tube
Drain electrode is connected with the negative electrode of the 3rd diode, and the source electrode of the 6th switching tube is connected with the drain electrode of the 8th switching tube, and defeated with described
The input going out filter inductance is connected, the drain electrode phase of anode with the 4th diode of the source electrode of the 8th switching tube and second switch pipe
Even, the source electrode of second switch pipe is connected with the negative terminal of the second DC source, one end of the 4th electric capacity and described output inductor
Outfan is connected, and the other end of the 4th electric capacity is connected with the source electrode of the 5th switching tube and the drain electrode of the 7th switching tube.
5. DC-AC conversion circuit as claimed in claim 1 is it is characterised in that the first, second, the 5th to the 8th switchs
Pipe is can be switched with the high-speed semiconductor that drive signal controls its break-make.
6. a kind of DC-AC conversion circuit is it is characterised in that include multiple circuit as described in claim 4 or 5 to be formed
Multiple power supplies output or single channel series connection output.
7. a kind of control method of the DC-AC conversion circuit as described in any one as claims 1 to 3 is it is characterised in that press
According to the level relationship of DC source input voltage and inverter output voltage, operating volume definition is six regions：When output voltage is
During true amplitude, the region that amplitude is less than the first DC source input voltage is referred to as 1st area, higher than the first DC source input voltage, low
In the first to the second DC source input voltage sum region be referred to as 2nd area, higher than the first to the second DC source input voltage it
With, less than the first to the 3rd DC source input voltage sum region be referred to as 3rd area；When output voltage is negative amplitude, amplitude
The region that absolute value is less than the first DC source input voltage absolute value is referred to as 4th area, absolute higher than the first DC source input voltage
Value, region referred to as 5th area less than 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, region referred to as 6th area less than the first to the 3rd DC source input voltage absolute value sum；
When output voltage is in 1st area or 4th area, the 3rd to the 4th switching tube normal open, the 5th to the 8th according to H bridge control method
It is operated；When output voltage is in 2nd area or 5th area, the 3rd switching tube normal open, second switch pipe carries out PWM control, the
5th, the 8th switching tube normal open or the six, the 7th switching tube normal opens, when second switch pipe is closed, by the 4th switching tube from
First DC source input voltage afterflow platform afterflow；When output voltage is in 3rd area or 6th area, second switch pipe normal open, first
Switching tube carries out PWM control, the five, the 8th switching tube normal opens or the six, the 7th switching tube normal opens, when first switch pipe is closed
When, by the 3rd switching tube from the afterflow platform afterflow of the first to the second DC input voitage sum；
Washability ground, in afterflow it is also possible to closing the 3rd switching tube or the 4th switching tube and being opened by opening the 5th and the 6th
Close pipe and reach afterflow purpose.
8. the control method of DC-AC conversion circuit as claimed in claim 7 is it is characterised in that the first to the 3rd direct current
Source input voltage is than for 2.3-2.7：2.8-3.2：3.3-3.7.
9. the control method of DC-AC conversion circuit as claimed in claim 8 is it is characterised in that the first to the 3rd direct current
Source input voltage is than for 2.5：3：3.5.
10. the DC-AC conversion circuit as described in a kind of any one as claim 4 to 6 control method it is characterised in that
According to the level relationship of DC source input voltage and inversion output AC voltage, operating volume definition is six regions：Work as output
When voltage is true amplitude, the region that amplitude is less than the first DC source input voltage is referred to as 1st area, higher than the first DC source input electricity
Pressure, less than first and the 3rd DC source input voltage sum region be referred to as 2nd area, higher than first and the 3rd DC source input electricity
Pressure sum, region referred to as 3rd area less than the first to the 3rd DC source input voltage sum；When output voltage is negative amplitude,
The region that amplitude absolute value is less than the first DC source input voltage absolute value is referred to as 4th area, higher than the first DC source input voltage
Absolute value, less than first and the 3rd DC source input voltage absolute value sum region be referred to as 5th area, straight higher than first and the 3rd
Stream source input voltage absolute value sum, region referred to as 6th area less than the first to the 3rd DC source input voltage absolute value sum；
When output voltage is in 1st area or 4th area, the 3rd to the 4th diode is turned on by forward bias voltage, and the 5th to the 8th
It is operated according to H bridge control method；When output voltage is in 2nd area or 5th area, the 4th diode current flow, first switch pipe
Carry out PWM control, the five, the 8th switching tube normal opens or the six, the 7th switching tube normal opens, when first switch pipe is closed, lead to
Cross the 3rd diode from the first DC source input voltage afterflow platform afterflow；When output voltage is in 3rd area or 6th area, first
Switching tube normal open, second switch pipe carries out PWM control, the five, the 8th switching tube normal opens or the six, the 7th switching tube normal opens,
When second switch pipe is closed, by the 4th diode from the afterflow platform afterflow of the first to the second DC input voitage sum；
Washability ground, in afterflow it is also possible to reach afterflow purpose by opening the 5th and the 6th switching tube.
The control method of 11. DC-AC conversion circuit as claimed in claim 10 is it is characterised in that first is straight to the 3rd
Stream source input voltage is than for 2.3-2.7：2.8-3.2：3.3-3.7.
The control method of 12. DC-AC conversion circuit as claimed in claim 11 is it is characterised in that first is straight to the 3rd
Stream source input voltage is than for 2.5：3：3.5.
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| CN107332452A (en) * | 2017-08-08 | 2017-11-07 | 深圳市保益新能电气有限公司 | A kind of AC/DC transfer circuit control method and its circuit |
| CN108512413B (en) * | 2018-03-09 | 2023-11-17 | 深圳市保益新能电气有限公司 | Conversion circuit and control method thereof |
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