CN103812373A - DC (Direct Current)-AC (Alternating Current) transfer circuit and control method thereof - Google Patents
DC (Direct Current)-AC (Alternating Current) transfer circuit and control method thereof Download PDFInfo
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Abstract
The invention discloses a DC (Direct Current)-AC (Alternating Current) transfer circuit and a control method thereof. The DC-AC circuit comprises a boost inducer, a boost switch tube, a rectifier diode, from first to fourth capacitors, an inverter bridge FWD (Fly-Wheel Diode), and from first to second output filter inducers. The invention further discloses a control method of the AC-DC transfer circuit. By using the different inversion working models of the boost circuit and the inverter bridge circuit, the invertion can be maximally performed by using the voltage of the DC input source, the working current of the boost circuit and the switching stress of all elements in an inverter bridge loop can be reduced, the working loss of the main elements of the boost circuit can be reduced, and the switching loss of all elements in the inverter bridge loop can be reduced, so that the efficiency and power density can be improved.
Description
Technical field
The present invention relates to Switching Power Supply, especially a kind of DC-AC translation circuit and control method thereof.
Background technology
In existing DC-AC conversion application scenario, as photovoltaic DC-to-AC converter etc., in the time that direct current (DC) the source voltage of input is not high enough, or in the wider situation of input range, all can adopt (boost) circuit that boosts to add inversion translation circuit.When this translation circuit work, the power component of prime booster circuit need to bear all operating currents, when rear level work, at whole output voltage range, needs again busbar voltage to carry out step-down inversion, so the loss of power tube is larger.Therefore be necessary to design a kind of new circuit, can as much as possible directly utilize DC source input voltage to carry out inversion, when need to be higher than the busbar voltage of input voltage, restart or utilize the energy of the high voltage bus after boosting, obtain higher cost performance.
Summary of the invention
The object of the present invention is to provide a kind of DC-AC translation circuit and control method thereof, make up above-mentioned the deficiencies in the prior art.
For achieving the above object, the present invention is by the following technical solutions:
A kind of DC-AC translation circuit, comprises boost inductance, boosted switch pipe, rectifier diode, first to fourth electric capacity, inverter bridge fly-wheel diode, inverter bridge, the first to second output inductor;
Wherein, one end of described boost inductance is connected with the positive input terminal of DC power supply, and one end is connected with the drain electrode of described boosted switch pipe and the anode of described rectifier diode in addition; The source electrode of described boosted switch pipe is connected with the negative input end of DC power supply; The negative electrode of described rectifier diode is connected with the positive pole of described the second electric capacity; The negative pole of described the second electric capacity is connected with the positive input terminal of DC power supply; Described the 4th electric capacity and described the first Capacitance parallel connection, the positive pole of described the 4th electric capacity is connected with the positive pole of described the first electric capacity and the positive input terminal of DC power supply, and the negative pole of described the 4th electric capacity is connected with the negative pole of described the first electric capacity and the negative input end of DC power supply; Described inverter bridge comprises first, the 3rd to the 6th switching tube, and the drain electrode of described the first switching tube is connected with the positive pole of the second electric capacity, and its source electrode is connected with the negative electrode of described inverter bridge fly-wheel diode; The anode of described inverter bridge fly-wheel diode is connected with the positive pole of described the first electric capacity; The drain electrode of described the 3rd switching tube is connected with the negative electrode of described inverter bridge fly-wheel diode, and its source electrode is connected with the drain electrode of described the 4th switching tube, is connected with the input of the first output inductor simultaneously; Described the 4th source electrode of switching tube and the negative input end of DC power supply are connected; The drain electrode of described the 5th switching tube is connected with the negative electrode of described inverter bridge fly-wheel diode, and its source electrode is connected with the drain electrode of described the 6th switching tube, is connected with the input of described the second output inductor simultaneously; Described the 6th source electrode of switching tube and the negative input end of DC power supply are connected; One end of described the 3rd electric capacity is connected with the output of described the first output inductor, and the other end of described the 3rd electric capacity is connected with the output of described the second output inductor.
Described first, the 3rd to the 6th switching tube can be, but not limited to as MOSFET or IGBT.
A kind of control method of described DC-AC translation circuit, according to the level relationship of input direct voltage and inversion output AC voltage, service area is defined as to four regions, in the time of inverter voltage positive half wave, amplitude is referred to as 1st district lower than the region of input direct voltage, be referred to as 2nd district higher than the region of input direct voltage, in the time of the negative half-wave of inverter voltage, amplitude absolute value is referred to as 3rd district lower than the region of input direct voltage, be referred to as 4th district higher than the region of input direct voltage, when in 1st district and 3rd district, described the 3rd to the 6th switching tube carries out work according to H bridge control method, when in 2nd district and 4th district, described the first switching tube carries out PWM control, the described the 3rd, the 6th switching tube normal open or the described the 5th, the 4th switching tube normal open, in the time that described the first switching tube is closed, by described inverter bridge fly-wheel diode from DC power supply afterflow.
Preferably, when the waveforms amplitude of inverter output voltage is in 1,2 districts or when the juncture area in 3,4 districts, described the first switching tube carries out PWM control, in the time that described the first switching tube is opened, described the 3rd, the 6th switching tube or described the 5th, the 4th switching tube are open-minded, after the first switching tube is closed, described the 4th, the 6th switching tube conducting is carried out afterflow or is utilized its anti-also diode to carry out afterflow, or between the afterflow period, the 6th switching tube or the 4th switching tube are closed, maintain described the 5th, the 3rd switching tube open-minded, to reach afterflow object.
A kind of DC-AC translation circuit, comprises boost inductance, boosted switch pipe, rectifier diode, first to fourth electric capacity, second switch pipe, inverter bridge, the first to second output inductor;
Wherein, one end of described boost inductance is connected with the positive input terminal of DC power supply, and one end is connected with the drain electrode of described boosted switch pipe and the anode of described rectifier diode in addition; The source electrode of described boosted switch pipe is connected with the negative input end of DC power supply; The negative electrode of described rectifier diode is connected with the positive pole of described the second electric capacity; The negative pole of described the second electric capacity is connected with the positive input terminal of DC power supply; Described the 4th electric capacity and described the first Capacitance parallel connection, the positive pole of described the 4th electric capacity is connected with the positive pole of described the first electric capacity and the positive input terminal of DC power supply, and the negative pole of described the 4th electric capacity is connected with the negative pole of described the first electric capacity and the negative input end of DC power supply; Described inverter bridge comprises first, the 3rd to the 6th switching tube, and the drain electrode of described the first switching tube is connected with the positive pole of the second electric capacity, and its source electrode is connected with the drain electrode of described second switch pipe; The source electrode of described second switch pipe is connected with the positive pole of described the first electric capacity; The drain electrode of described the 3rd switching tube is connected with the drain electrode of described second switch pipe, and its source electrode is connected with the drain electrode of described the 4th switching tube, is connected with the input of the first output inductor simultaneously; Described the 4th source electrode of switching tube and the negative input end of DC power supply are connected; The drain electrode of described the 5th switching tube is connected with the drain electrode of described second switch pipe, and its source electrode is connected with the drain electrode of described the 6th switching tube, is connected with the input of described the second output inductor simultaneously; Described the 6th source electrode of switching tube and the negative input end of DC power supply are connected; One end of described the 3rd electric capacity is connected with the output of described the first output inductor, and the other end of described the 3rd electric capacity is connected with the output of described the second output inductor.
The described first to the 6th switching tube can be, but not limited to as MOSFET or IGBT.
According to the level relationship of input direct voltage and inversion output AC voltage, service area is defined as to four regions, in the time of inverter voltage positive half wave, amplitude is referred to as 1st district lower than the region of input direct voltage, be referred to as 2nd district higher than the region of input direct voltage, when in 1st district and 3rd district, described second switch pipe is opened or is closed but passes through its anti-and diode current flow, described the 3rd to the 6th switching tube carries out work according to H bridge control method, when in 2nd district and 4th district, described the first switching tube carries out PWM control, the described the 3rd, the 6th switching tube normal open or the described the 5th, the 4th switching tube normal open, in the time that described the first switching tube is closed, described second switch pipe can open with by described second switch pipe from DC power supply afterflow.
Preferably, when the waveforms amplitude of inverter output voltage is in 1,2 districts or when the juncture area in 3,4 districts, described the first switching tube carries out PWM control, in the time that described the first switching tube is opened, described the 3rd, the 6th switching tube or described the 5th, the 4th switching tube are open-minded, after the first switching tube is closed, described the 4th, the 6th switching tube conducting is carried out afterflow or is utilized its anti-also diode to carry out afterflow, or between the afterflow period, the 6th switching tube or the 4th switching tube are closed, maintain described the 5th, the 3rd switching tube open-minded, to reach afterflow object.
Useful technique effect of the present invention:
According to DC-AC translation circuit of the present invention and control method thereof, utilize the different inversion mode of operations of booster circuit and inverter bridge circuit, can farthest utilize the voltage of direct current input source to carry out inversion, that has reduced the operating current of booster circuit and reduced each element in inverter bridge loop opens and turn-offs stress, reduce the working loss of the main element of booster circuit, also reduce the switching loss of element in inverter bridge circuit simultaneously, thereby be convenient to raise the efficiency and power density, also contribute to the operating frequency of inverter circuit to improve, reduce volume.The present invention has a clear superiority at the inverter of middle low power.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of DC-AC translation circuit embodiment mono-of the present invention;
Fig. 2 is embodiment of the present invention inversion working region mode division schematic diagram;
Fig. 3 is that embodiment of the present invention inverter bridge PWM drives sequential schematic diagram;
Fig. 4 is the circuit diagram of DC-AC translation circuit embodiment bis-of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated.Should be emphasized that, following explanation is only exemplary, rather than in order to limit the scope of the invention and to apply.
Embodiment mono-
Direct current AC transform circuit as shown in Figure 1, comprises boost inductance L1, boosted switch pipe Q7, rectifier diode D8, first to fourth capacitor C 1, C2, C3, C4, inverter bridge sustained diode 2, inverter bridge, the first to second output inductor L2, L3.
In this direct current AC transform circuit, one end of described boost inductance L1 is connected with the positive input terminal of DC power supply, and one end is connected with described boosted switch pipe Q7 drain electrode and described rectifier diode D8 anode in addition; The source electrode of described boosted switch pipe Q7 is connected with the negative input end of DC power supply DC input; The negative electrode of described rectifier diode D8 is connected with the positive pole of described the second capacitor C 2 by positive bus-bar bus; Described second negative pole of capacitor C 2 and the positive input terminal of DC power supply are connected; Described the 4th capacitor C 4 is in parallel with described the first capacitor C 1, the positive pole of described the 4th capacitor C 4 is connected with described first positive pole of capacitor C 1 and the positive input terminal of DC power supply, and the negative pole of described the 4th capacitor C 4 is connected with described first negative pole of capacitor C 1 and the negative input end of DC power supply; Described inverter bridge comprises first, the 3rd to the 6th switching tube Q1, Q3, Q4, Q5, Q6, and the drain electrode of described the first switching tube Q1 is connected with the positive pole of the second electric capacity, and its source electrode is connected with the negative electrode of described inverter bridge sustained diode 2; The anode of described inverter bridge sustained diode 2 is connected with the positive pole of described the first capacitor C 1; The drain electrode of described the 3rd switching tube Q3 is connected with the negative electrode of described inverter bridge sustained diode 2, and its source electrode is connected with the drain electrode of described the 4th switching tube Q4, is connected with the input of the first output inductor L2 simultaneously; Described the 4th source electrode of switching tube Q4 and the negative input end of DC power supply are connected; The drain electrode of described the 5th switching tube Q5 is connected with the negative electrode of described inverter bridge sustained diode 2, and its source electrode is connected with the drain electrode of described the 6th switching tube Q6, is connected with the input of described the second output inductor L3 simultaneously; Described the 6th source electrode of switching tube Q6 and the negative input end of DC power supply are connected; One end of described the 3rd capacitor C 3 is connected with the output of described the first output inductor L2, and the other end of described the 3rd capacitor C 3 is connected with the output of described the second output inductor L3.
In order to discuss conveniently, suppose that DC input voitage value is designated as Vin, inversion the highest required busbar voltage is Vbus; The miscellaneous pressure drop of circuit and switch element conduction voltage drop in inversion process add up to Vloss; D is the duty ratio of opening of inversion pwm signal; The essence of the transformation relation of inverter output voltage is Vout=(Vbus-Vloss) * D or Vout=(Vin-Vloss) * D, carries out step-down processing to the voltage before inversion.
When input voltage vin value is during lower than Vbus, shown in Fig. 1 circuit in, two kinds of inverter voltages are provided can to inversion city circuit, a kind of is exactly the Vin that boosts and process, another is direct current to be inputted to Vin boost and be treated to Vbus.As shown in Figure 2, when the waveform of inversion output is in positive half wave 1. when region, now switching tube Q1, Q4, the driving signal of Q5 be low always, i.e. shutoff always, the driving signal of switching tube Q6 is high level, i.e. conducting always always; Switching tube Q3 conducting in the time that PWM drives the high level signal of signal, D2 is subject to forward bias and conducting simultaneously; Electric current is from DC power supply process D2, switching tube Q3, inductance L 2, load, inductance L 3, switching tube Q6 forms loop, in the time that the PWM of switching tube Q3 drives signal to become low level signal, electric current is from DC power supply process D2, anti-and the diode (also can utilize the PWM with switching tube Q3 complementation to drive signal conduction) of switching tube Q4, inductance L 2, load, inductance L 3, switching tube Q6 forms continuous current circuit; In this region, according to the sampled signal feedback processing of controller, adjust the size of duty ratio D.When the waveform of inversion output is in negative half-wave 3. when region, now switching tube Q1, Q3, the driving signal of Q6 be low always, i.e. shutoff always, the driving signal of switching tube Q4 is high level, i.e. conducting always always; Switching tube Q5 conducting in the time that PWM drives the high level signal of signal, D2 is subject to forward bias and conducting simultaneously; Electric current is from DC power supply process D2, switching tube Q5, inductance L 2, load, inductance L 3, switching tube Q4 forms loop, in the time that the PWM of switching tube Q3 drives signal to become low level signal, electric current is from DC power supply process D2, anti-and the diode (also can utilize the PWM with switching tube Q5 complementation to drive signal conduction) of switching tube Q6, inductance L 2, load, inductance L 3, switching tube Q4 forms continuous current circuit; Comprehensive overall process, this period is that Vin is carried out to step-down processing, Vout=(Vin-Vloss) * D; In this region, due to the power supply boosting without utilization, so the loss of booster circuit reduces, meanwhile, the relative Vbus of the pressure drop of inverter bridge in switching process reduces a lot, so switching loss reduces simultaneously.
When the waveform of inversion output is in positive half wave 2. when region, now switching tube Q4, the driving signal of Q5 be low always, i.e. shutoff always; Switching tube Q6, the driving signal of Q3 is high level, i.e. conducting always always; Switching tube Q1 conducting in the time that PWM drives the high level signal of signal, electric current is from DC power supply process switching tube Q1, switching tube Q3, inductance L 2, load, inductance L 3, switching tube Q6 forms loop, and in the time that the PWM of Q1 drives signal to become low level signal, D2 is subject to forward bias and conducting afterflow simultaneously; Electric current passes through D2 from DC power supply, switching tube Q3, and inductance L 2, load, inductance L 3, switching tube Q6 forms continuous current circuit; In this region, according to the sampled signal feedback processing of controller, adjust the size of duty ratio D, meet the control to output voltage.In like manner, when the waveform of inversion output is in positive half wave 4. when region, now switching tube Q6, the driving signal of Q3 be low always, i.e. shutoff always; Switching tube Q4, the driving signal of Q5 is high level, i.e. conducting always always; Switching tube Q1 conducting in the time that PWM drives the high level signal of signal, electric current is from DC power supply process switching tube Q1, switching tube Q5, inductance L 2, load, inductance L 3, switching tube Q4 forms loop, in the time that the PWM of switching tube Q1 drives signal to become low level signal, D2 is subject to forward bias and conducting afterflow simultaneously; Electric current passes through D2 from DC power supply, switching tube Q5, and inductance L 2, load, inductance L 3, switching tube Q4 forms continuous current circuit.Comprehensive overall process, this period can be regarded as Vbus is carried out to step-down processing, i.e. Vout=(Vin-Vloss)+(Vbus-Vin-Vloss) * D; In this region, the platform of its afterflow voltage is Vin, 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 Q1 reduces a lot.
In addition, when the waveform of inversion output in positive half wave 1. 2., 2. 1. juncture area or in positive half wave 3. 4., 4. 3. when juncture area, when switching tube Q1 opens, can adopt with region 2. or 4. consistent sequential control method of region; When closing, switching tube Q1 has no progeny, now can not be using Vin as afterflow platform, and therefore, switching tube Q3 or switching tube Q5 must turn-off, to cut off and the path of Vin; Simultaneous Switching pipe Q4, Q6 maintains conducting and carries out afterflow, Vout=(Vbus-Vloss) * D.Therefore interval is shorter, and relational graph is presented at and in Fig. 3, only indicates this mode of operation and transient process.
In the time that input voltage vin value equals Vbus, boost without startup; Now switching tube Q1 is without open-minded, and its inversion work is consistent with traditional H bridge.In this just no longer burden narration.
In sum, when input voltage vin value is during lower than Vbus, while needing to start the booster circuit of prime, adopt this change-over circuit, simultaneously according to relevant operation control method, just can obviously reduce the loss of booster circuit, make full use of the voltage of direct current input source, can lower again the switching loss of rear class inverter bridge simultaneously, so be conducive to the raising of inverter bridge PWM frequency, be that whole circuit is realized high frequency, dwindle the volume of inverter, improve power density.By calculating and emulation, when the voltage of direct current input source between inversion the highest required busbar voltage (Vbus) 0.333 to 0.866 between time, start corresponding mode of operation and reduce achieving noticeable achievement of switching loss.
Embodiment bis-
As shown in Figure 4, be another embodiment of the present invention, itself and difference are that the switching tube Q2 in circuit has replaced the D2 of embodiment mono-.When inversion output waveform is in aforesaid 1. 3. when region, switching tube Q2 can be applied in high level conducting always, is equivalent to the synchronous rectification of embodiment mono-.Aforesaid, 2. 4. when region, in the time of needs afterflow, switching tube Q2 can be applied in the PWM of switching tube Q1 complementation and drive signal to carry out conducting.Other part and embodiment mono-indistinction, so again do not tire out and state.
Switching tube in the present invention can be the speed-sensitive switch of all kinds of two-way admittances by its break-make of driving signal controlling, as MOSFET or IGBT etc., and is not limited only to power semiconductor switch represented in figure.
Above content is in conjunction with concrete preferred implementation 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, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (8)
1. a DC-AC translation circuit, is characterized in that, comprises boost inductance, boosted switch pipe, rectifier diode, first to fourth electric capacity, inverter bridge fly-wheel diode, inverter bridge, the first to second output inductor;
Wherein, one end of described boost inductance is connected with the positive input terminal of DC power supply, and one end is connected with the drain electrode of described boosted switch pipe and the anode of described rectifier diode in addition; The source electrode of described boosted switch pipe is connected with the negative input end of DC power supply; The negative electrode of described rectifier diode is connected with the positive pole of described the second electric capacity; The negative pole of described the second electric capacity is connected with the positive input terminal of DC power supply; Described the 4th electric capacity and described the first Capacitance parallel connection, the positive pole of described the 4th electric capacity is connected with the positive pole of described the first electric capacity and the positive input terminal of DC power supply, and the negative pole of described the 4th electric capacity is connected with the negative pole of described the first electric capacity and the negative input end of DC power supply; Described inverter bridge comprises first, the 3rd to the 6th switching tube, and the drain electrode of described the first switching tube is connected with the positive pole of the second electric capacity, and its source electrode is connected with the negative electrode of described inverter bridge fly-wheel diode; The anode of described inverter bridge fly-wheel diode is connected with the positive pole of described the first electric capacity; The drain electrode of described the 3rd switching tube is connected with the negative electrode of described inverter bridge fly-wheel diode, and its source electrode is connected with the drain electrode of described the 4th switching tube, is connected with the input of the first output inductor simultaneously; Described the 4th source electrode of switching tube and the negative input end of DC power supply are connected; The drain electrode of described the 5th switching tube is connected with the negative electrode of described inverter bridge fly-wheel diode, and its source electrode is connected with the drain electrode of described the 6th switching tube, is connected with the input of described the second output inductor simultaneously; Described the 6th source electrode of switching tube and the negative input end of DC power supply are connected; One end of described the 3rd electric capacity is connected with the output of described the first output inductor, and the other end of described the 3rd electric capacity is connected with the output of described the second output inductor.
2. DC-AC translation circuit as claimed in claim 1, is characterized in that, described first, the 3rd to the 6th switching tube is MOSFET or IGBT.
3. the control method of a DC-AC translation circuit as claimed in claim 1, it is characterized in that, according to the level relationship of input direct voltage and inversion output AC voltage, service area is defined as to four regions, in the time of inverter voltage positive half wave, amplitude is referred to as 1st district lower than the region of input direct voltage, be referred to as 2nd district higher than the region of input direct voltage, in the time of the negative half-wave of inverter voltage, amplitude absolute value is referred to as 3rd district lower than the region of input direct voltage, be referred to as 4th district higher than the region of input direct voltage, when in 1st district and 3rd district, described the 3rd to the 6th switching tube carries out work according to H bridge control method, when in 2nd district and 4th district, described the first switching tube carries out PWM control, the described the 3rd, the 6th switching tube normal open or the described the 5th, the 4th switching tube normal open, in the time that described the first switching tube is closed, by described inverter bridge fly-wheel diode from DC power supply afterflow.
4. control method as claimed in claim 3, it is characterized in that, when the waveforms amplitude of inverter output voltage is in 1, 2nd district or 3, when the juncture area in 4th district, described the first switching tube carries out PWM control, in the time that described the first switching tube is opened, the described the 3rd, the 6th switching tube or the described the 5th, the 4th switching tube is open-minded, after the first switching tube is closed, the described the 4th, the 6th switching tube conducting is carried out afterflow or is utilized its anti-also diode to carry out afterflow, or between the afterflow period, the 6th switching tube or the 4th switching tube are closed, maintain the described the 5th, the 3rd switching tube is open-minded, to reach afterflow object.
5. a DC-AC translation circuit, is characterized in that, comprises boost inductance, boosted switch pipe, rectifier diode, first to fourth electric capacity, second switch pipe, inverter bridge, the first to second output inductor;
Wherein, one end of described boost inductance is connected with the positive input terminal of DC power supply, and one end is connected with the drain electrode of described boosted switch pipe and the anode of described rectifier diode in addition; The source electrode of described boosted switch pipe is connected with the negative input end of DC power supply; The negative electrode of described rectifier diode is connected with the positive pole of described the second electric capacity; The negative pole of described the second electric capacity is connected with the positive input terminal of DC power supply; Described the 4th electric capacity and described the first Capacitance parallel connection, the positive pole of described the 4th electric capacity is connected with the positive pole of described the first electric capacity and the positive input terminal of DC power supply, and the negative pole of described the 4th electric capacity is connected with the negative pole of described the first electric capacity and the negative input end of DC power supply; Described inverter bridge comprises first, the 3rd to the 6th switching tube, and the drain electrode of described the first switching tube is connected with the positive pole of the second electric capacity, and its source electrode is connected with the drain electrode of described second switch pipe; The source electrode of described second switch pipe is connected with the positive pole of described the first electric capacity; The drain electrode of described the 3rd switching tube is connected with the drain electrode of described second switch pipe, and its source electrode is connected with the drain electrode of described the 4th switching tube, is connected with the input of the first output inductor simultaneously; Described the 4th source electrode of switching tube and the negative input end of DC power supply are connected; The drain electrode of described the 5th switching tube is connected with the drain electrode of described second switch pipe, and its source electrode is connected with the drain electrode of described the 6th switching tube, is connected with the input of described the second output inductor simultaneously; Described the 6th source electrode of switching tube and the negative input end of DC power supply are connected; One end of described the 3rd electric capacity is connected with the output of described the first output inductor, and the other end of described the 3rd electric capacity is connected with the output of described the second output inductor.
6. DC-AC translation circuit as claimed in claim 5, is characterized in that, the described first to the 6th switching tube is MOSFET or IGBT.
7. the control method of a DC-AC translation circuit as claimed in claim 5, it is characterized in that, according to the level relationship of input direct voltage and inversion output AC voltage, service area is defined as to four regions, in the time of inverter voltage positive half wave, amplitude is referred to as 1st district lower than the region of input direct voltage, be referred to as 2nd district higher than the region of input direct voltage, when in 1st district and 3rd district, described second switch pipe is opened or is closed but passes through its anti-and diode current flow, described the 3rd to the 6th switching tube carries out work according to H bridge control method, when in 2nd district and 4th district, described the first switching tube carries out PWM control, the described the 3rd, the 6th switching tube normal open or the described the 5th, the 4th switching tube normal open, in the time that described the first switching tube is closed, described second switch pipe can open with by described second switch pipe from DC power supply afterflow.
8. control method as claimed in claim 7, it is characterized in that, when the waveforms amplitude of inverter output voltage is in 1, 2nd district or 3, when the juncture area in 4th district, described the first switching tube carries out PWM control, in the time that described the first switching tube is opened, the described the 3rd, the 6th switching tube or the described the 5th, the 4th switching tube is open-minded, after the first switching tube is closed, the described the 4th, the 6th switching tube conducting is carried out afterflow or is utilized its anti-also diode to carry out afterflow, or between the afterflow period, the 6th switching tube or the 4th switching tube are closed, maintain the described the 5th, the 3rd switching tube is open-minded, to reach afterflow object.
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| CN104578880A (en) * | 2015-01-16 | 2015-04-29 | 深圳市保益新能电气有限公司 | DC-AC conversion circuit and control method thereof |
| CN106655864A (en) * | 2015-11-02 | 2017-05-10 | 南京航空航天大学 | Isolated full-bridge inverter and control method thereof |
| CN106655798A (en) * | 2016-11-25 | 2017-05-10 | 广东百事泰电子商务股份有限公司 | Smart sine-wave boost converter |
| CN114865709A (en) * | 2022-07-07 | 2022-08-05 | 浙江日风电气股份有限公司 | Bus voltage control method, device and medium for single-phase photovoltaic inverter |
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| CN106655864A (en) * | 2015-11-02 | 2017-05-10 | 南京航空航天大学 | Isolated full-bridge inverter and control method thereof |
| CN106655864B (en) * | 2015-11-02 | 2019-04-16 | 南京航空航天大学 | A kind of isolated form full-bridge inverter and its control method |
| CN106655798A (en) * | 2016-11-25 | 2017-05-10 | 广东百事泰电子商务股份有限公司 | Smart sine-wave boost converter |
| CN114865709A (en) * | 2022-07-07 | 2022-08-05 | 浙江日风电气股份有限公司 | Bus voltage control method, device and medium for single-phase photovoltaic inverter |
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