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CN207691701U - A kind of DC/AC modules of photovoltaic generating system - Google Patents

A kind of DC/AC modules of photovoltaic generating system Download PDF

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Publication number
CN207691701U
CN207691701U CN201820123362.3U CN201820123362U CN207691701U CN 207691701 U CN207691701 U CN 207691701U CN 201820123362 U CN201820123362 U CN 201820123362U CN 207691701 U CN207691701 U CN 207691701U
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China
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switching tube
output
termination
filter
capacitance
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CN201820123362.3U
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Chinese (zh)
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胡炎申
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

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Abstract

The utility model discloses a kind of DC/AC modules of photovoltaic generating system, including direct-flow input end, ac output end, dc-link capacitance, inverter bridge, output filter circuit, for exchanging the striding capacitance of the circumferential inverter bridge power supply of output the second half and exchange the first half cycle of output to switching circuit striding capacitance charging and power to inverter bridge, dc-link capacitance is connected between the positive electrode and negative electrode of direct-flow input end, output filter circuit is connected between inverter bridge and ac output end, the input of switching circuit terminates direct-flow input end, the output end at the both ends of striding capacitance charging and the input termination switch circuit of inverter bridge.The DC/AC module DC bus current ripples of the utility model are smaller, inverter circuit transfer efficiency is higher.

Description

A kind of DC/AC modules of photovoltaic generating system
[technical field]
The utility model is related to the DC/AC modules of photovoltaic generating system more particularly to a kind of photovoltaic generating system.
[background technology]
The basic principle of DC/AC inversion transformation techniques is to turn on and off effect by semiconductor power switch device, straight Galvanic electricity can be transformed into AC energy, it is a kind of electrical energy changer.
The principle of traditional DC/AC conversion circuits is as shown in figure 5, include direct-flow input end, ac output end, direct current Bus capacitor, inverter bridge and output filter circuit, traditional DC/AC conversion circuits DC bus current ripple is big, component body Product and weight are big, transfer efficiency is relatively low.
[invention content]
Smaller, inverter circuit conversion that the technical problem to be solved by the present invention is to provide a kind of DC bus current ripples The DC/AC modules of the higher photovoltaic generating system of efficiency.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model is a kind of DC/ of photovoltaic generating system AC modules, including it is direct-flow input end, ac output end, dc-link capacitance, inverter bridge, output filter circuit, defeated for exchanging Go out the striding capacitances of the second half circumferential inverter bridge power supplies and charges to striding capacitance and to inverter bridge confession with the first half cycle of output exchange The switching circuit of electricity, dc-link capacitance are connected between the positive electrode and negative electrode of direct-flow input end, and output filter circuit is connected on inversion Between bridge and ac output end, the input of switching circuit terminates direct-flow input end, the both ends of striding capacitance charging and inverter bridge The output end of input termination switch circuit.
Above-described DC/AC modules, switching circuit include first switch pipe, second switch pipe and third switching tube, inverse It includes the 4th switching tube, the 5th switching tube, the 6th diode and the 7th diode to become bridge, and output filter circuit includes the first exchange Filter inductance, the second ac filter inductance and the first ac filter capacitance;The high potential of second switch pipe terminates the 4th switching tube Hot end and the 6th diode cathode, second switch pipe low potential termination third switching tube hot end;Third The low potential of switching tube terminates the cold end of the anode and the 5th switching tube of the 7th diode, and the cathode of the 7th diode connects the The cold end of four switching tubes, the high potential of the 5th switching tube terminate the anode of the 6th diode;Striding capacitance is connected on second and opens Between the hot end and the cold end of third switching tube that close pipe;First the 4th switching tube of termination of the first ac filter inductance Cold end, the first ac filter inductance second termination the second ac filter inductance second end, the second ac filter electricity The hot end of first the 5th switching tube of termination of sense;First the first ac filter inductance of termination of the first ac filter capacitance Second end, the second termination direct-flow input end of the first ac filter capacitance are simultaneously grounded;For the DC/AC modules of cathode ground connection, the Three switching tubes include body diode, and the high potential of first switch pipe terminates the anode of direct-flow input end, and low potential termination second is opened The hot end of pipe is closed, the low potential of second switch pipe terminates cathode and the ground connection of direct-flow input end;For the DC/ of plus earth AC modules, second switch pipe include body diode, and the low potential of first switch pipe terminates the cathode of DC/AC module direct currents input, High potential terminates the cold end of third switching tube, and the high potential of third switching tube terminates anode and the ground connection of direct-flow input end.
Above-described DC/AC modules, switching circuit include the 11st switching tube, the 12nd switching tube and the 13rd switch Pipe, inverter bridge include the 14th switching tube and the 15th switching tube, output filter circuit include the 11st ac filter inductance and 11st ac filter capacitance;14th switching tube and the 15th switching tube include respectively body diode;The height of 12nd switching tube Current potential terminates the hot end of the 14th switching tube, and the low potential of the 12nd switching tube terminates the high potential of the 13rd switching tube End;The low potential of 13rd switching tube terminates the cold end of the 15th switching tube, the low potential termination of the 14th switching tube the The first end of the hot end of 15 switching tubes and the 11st ac filter inductance;Striding capacitance is connected on the height of the 12nd switching tube Between potential end and the cold end of the 13rd switching tube;The first end of 11st ac filter capacitance is as DC/AC modules First ac output end connects the second end of the 11st ac filter inductance, and the second end of the 11st ac filter capacitance is as DC/ Second ac output end of AC modules, the ground terminal of direct-flow input end;For the DC/AC modules of cathode ground connection, the 13rd switch Pipe includes body diode, the anode of the high potential termination direct-flow input end of the 11st switching tube, the 12nd switch of low potential termination The low potential of the hot end of pipe, the 12nd switching tube terminates cathode and the ground connection of direct current input;For the DC/AC of plus earth Module, the 12nd switching tube includes body diode, the cathode of the low potential termination direct-flow input end of the 11st switching tube, high potential The cold end of the 13rd switching tube is terminated, the high potential of the 13rd switching tube terminates anode and the ground connection of direct-flow input end.
The DC/AC module DC bus current ripples of the utility model are smaller, inverter circuit transfer efficiency is higher.
[description of the drawings]
Utility model will be further described in detail below with reference to the attached drawings and specific embodiments.
Fig. 1 is the circuit diagram of the DC/AC module embodiments 1 of the utility model cathode ground connection.
Fig. 2 is the circuit diagram of the DC/AC module embodiments 2 of the utility model cathode ground connection.
Fig. 3 is the circuit diagram of the DC/AC module embodiments 1 of the utility model plus earth.
Fig. 4 is the circuit diagram of the DC/AC module embodiments 2 of the utility model plus earth.
Fig. 5 is the circuit diagram of prior art DC/AC conversion circuits.
[specific implementation mode]
The structure of the DC/AC module embodiments 1 of the utility model photovoltaic generating system cathode ground connection is as shown in Figure 1, include Dc-link capacitance C5, inverter bridge, output filter circuit, for exchange that output sine wave negative half period power to inverter bridge it is winged across Capacitance C3 with exchange output sine wave positive half cycle to switching circuit striding capacitance C3 charging and power to inverter bridge.
Switching circuit includes power switch tube S 1, S2 and S3, and inverter bridge includes power switch tube S 4, S5, power diode D6 and D7, output filter circuit include ac filter inductance L1, L2 and ac filter capacitance C4.
D1, D2, D3, D4 and D5 are respectively the body diode of the S5 of S1, S2, S3, S4.
The present embodiment externally has the port a, b, c, and the ends a are the cathode of DC/AC module direct-flow input ends, and the ends b are DC/AC moulds The anode of block direct-flow input end, the ends c are the ac output ends of DC/AC modules, and the ends d and the ends e are respectively the midpoint of inverter bridge leg.
When exchange exports sine wave positive half cycle, S1, S3, S4 are opened at this time and S2, S5 are turned off, the body that C5 passes through S1, S3 Diode D3 charges to C3, while realizing that ac converter exports by S1, S4 and by L1, C4 filtering, at this time inverter bridge leg Midpoint d refers to the voltage value at the ends a with C5 terminal voltages equipotential with "+1 ";When S4 is turned off, C5 continues through the body two of S1, S3 Pole pipe D3 gives C3 chargings, while being stored in the energy on L1 and realizing afterflow by S3, D7, at this time d be zero to the voltage value at the ends a and It is referred to " 0 ".When exchange output sine wave negative half period, S1, S3, S4 shutdown and S2, S5 are open-minded, the storage energy of C3 by S2, S5 is simultaneously filtered by L2, C4 and is realized that ac converter exports, at this time voltage values and C3 terminal voltage of the inverter bridge leg midpoint e to the ends a Mutually referred to instead with " -1 ";When S5 is turned off, the energy for being stored in L2 realizes afterflow by S2, D6, at this time voltage values of the e to the ends a It is zero and is referred to " 0 ".When S1, S3 are opened, C3 is substantially to be connected in parallel, thus can reduce DC bus current line with C5 Wave.Meanwhile inverter bridge leg midpoint d and e generates "+1 ", " 0 ", " -1 " three kinds of level to the ends a, thus realize three electricity of inverter circuit Flat output.
From the foregoing, it can be seen that when exchange output sine wave positive half cycle, power switch tube S 1, S3 are only the work of power frequency low frequency switch And IGBT device can be used, S4 can be used MOSFET for high-frequency work during this period, can also be used when switching frequency is relatively low Fast recovery or SiC also can be used for high-frequency work during this period in IGBT, D7(Silicon carbide)Etc. types;Exchange output sine wave is negative When half cycle, power switch tube S 2 is only the work of power frequency low frequency switch and IGBT device can be used, and S5 is high-frequency work during this period And MOSFET can be used, it can also be used IGBT, D6 also to can be used during this period for high-frequency work fast extensive when switching frequency is relatively low Multiple or SiC(Silicon carbide)Etc. types.Simultaneously as the bi-directional conductive of power switch tube and its body diode, it will be apparent that this DC/AC modules can realize the two-way flow of energy, to which system has active output and reactive power compensation planning.By S4 and D7 or In the same inverter bridge leg that S5 and D6 is respectively constituted, inside be only connected in series with by power switch tube and power diode, without There are switching tubes directly to connect, and also referred to as without dead-zone technique, this mode can eliminate Switch Cut-through risk, improve reliable operation Property.Five power switch tubes and two power diodes are the work of half power frequency period, two of which power switch tube, two Power diode HF switch in half of power frequency period works, and in addition power tube is open-minded there are two loop of power circuit, to drop Low-power consumption improves transfer efficiency, while reducing power device thermal stress, further increasing functional reliability.Power switch Pipe is switched on or off instruction and comes from control circuit or MCU(Microcontroller), modulated by using Unipolar SPWM and realize output "+1 ", " 0 ", " -1 " three kinds of level, to reduce the size and volume of internal passive device such as inductance, capacitance, alleviate Inverter weight, and further increase transfer efficiency.Meanwhile the high-frequency tube of internal circuit is using MOSFET and power frequency pipe makes With IGBT, DC/AC module costs are reduced to a certain extent.
Embodiment 1 shown in FIG. 1 can be further simplified, and remove power diode D6, D7 and ac filter inductance L2, to The DC/AC module embodiments 2 of cathode ground connection shown in Fig. 2 are constituted, embodiment 2 includes dc-link capacitance C5, inverter bridge, output filter Wave circuit exports sine wave positive half cycle with exchanging for exchanging the striding capacitance C3 that power to inverter bridge of output sine wave negative half period Switching circuit C3 chargings to striding capacitance and powered to inverter bridge.
Switching circuit includes power switch tube S 1, S2 and S3, and inverter bridge includes power switch tube S 4 and S5, exports filtered electrical Road includes ac filter inductance L1=and ac filter capacitance C4.
D1, D2, D3, D4 and D5 are respectively the body diode of the S5 of S1, S2, S3, S4.
The present embodiment externally has the port a, b, c, and the ends a are the cathode of DC/AC module direct-flow input ends, and the ends b are DC/AC moulds The anode of block direct-flow input end, the ends c are the ac output ends of DC/AC modules, and the ends d are the midpoint of inverter bridge leg.
When exchange output sine wave positive half cycle, S1, S3, S4 are opened at this time and S2, S5 are turned off, the body two that C5 passes through S1, S3 Pole pipe D3 charges to C3, while realizing that ac converter exports by S1, S4 and by L1, C4 filtering, at this time in inverter bridge leg Point d refers to the voltage value at the ends a with C5 terminal voltages equipotential with "+1 ";When S4 is turned off, C5 continues through two pole of body of S1, S3 Pipe D3 charges to C3, while being stored in the energy on L1 and realizing afterflow by the body diode D5 of S3, S5, at this time electricity of the d to the ends a Pressure value is zero and is referred to " 0 ".When exchange output sine wave negative half period, S1, S3, S4 are turned off and S2, S5 are open-minded, the storage energy of C3 Amount realizes that ac converter exports by S2, S5 and by L1, C4 filtering by, at this time inverter bridge leg midpoint d to the voltage value at the ends a with C3 terminal voltages are mutually referred to " -1 " instead;When S5 is turned off, the energy for being stored in L1 is continuous by the body diode D4 realizations of S2, S4 Stream, at this time d be zero to the voltage value at the ends a and referred to " 0 ".When S1, S3 are opened, C3 is substantially to be connected in parallel with C5, thus DC bus current ripple can be reduced.Meanwhile inverter bridge leg midpoint d generates "+1 ", " 0 ", " -1 " three kinds of level to the ends a, thus Realize the three level output of inverter circuit.
From the foregoing, it can be seen that when exchange output sine wave positive half cycle, power switch tube S 1, S3 are only the work of power frequency low frequency switch And IGBT device can be used, S4 can be used MOSFET for high-frequency work during this period, can also be used when switching frequency is relatively low IGBT;When exchange output sine wave negative half period, power switch tube S 2 is only the work of power frequency low frequency switch and IGBT device can be used, MOSFET can be used for high-frequency work during this period in S5, and IGBT can also be used when switching frequency is relatively low.Simultaneously as power is opened Close the bi-directional conductive of pipe and its body diode, it will be apparent that this DC/AC module can realize the two-way flow of energy, to system With active output and reactive power compensation planning.Five power switch tubes are half of power frequency period work, and two of which power is opened It closes pipe HF switch in half of power frequency period to work, in addition power tube is open-minded there are two loop of power circuit, to reduce power Loss improves transfer efficiency, while reducing power device thermal stress, improving functional reliability.Power switch tube is switched on or off Instruction comes from control circuit or MCU(Microcontroller), by using Unipolar SPWM modulate realize output "+1 ", " 0 ", "- 1 " three kind of level, to reduce the size and volume of internal passive device such as inductance, capacitance, alleviate inverter weight, and And further increase transfer efficiency.Meanwhile the high-frequency tube of internal circuit using MOSFET and power frequency pipe use IGBT, certain DC/AC module costs are reduced in degree.
The structure of the DC/AC module embodiments 1 of the utility model photovoltaic generating system plus earth is as shown in figure 3, include Dc-link capacitance C5, inverter bridge, output filter circuit, for exchange that output sine wave positive half cycle power to inverter bridge it is winged across Capacitance C3 with exchange output sine wave negative half period to switching circuit striding capacitance C3 charging and power to inverter bridge.
Switching circuit includes power switch tube S 1, S2 and S3, and inverter bridge includes power switch tube S 4, S5, power diode D6 and D7, output filter circuit include ac filter inductance L1, L2 and ac filter capacitance C4.
D1, D2, D3, D4 and D5 are respectively the body diode of the S5 of S1, S2, S3, S4.
The present embodiment externally has the port a, b, c, and the ends a are the anodes of DC/AC module direct-flow input ends, and the ends b are DC/AC moulds The cathode of block direct-flow input end, the ends c are the ac output ends of DC/AC modules, and the ends d and the ends e are respectively the midpoint of inverter bridge leg.
When exchange output sine wave negative half period, S1, S2, S5 are opened at this time and S3, S4 are turned off, the body two that C5 passes through S1, S2 Pole pipe D3 charges to C3, while realizing that ac converter exports by S1, S5 and by L2, C4 filtering, at this time in inverter bridge leg Point e mutually refers to the voltage value at the ends a with C5 terminal voltages with " -1 " instead;When S5 is turned off, C5 continues through the body diode of S1, S2 D3 gives C3 chargings, while being stored in the energy on L2 and realizing afterflow by S2, D6, at this time e to the voltage value at the ends a be zero and with " 0 " refers to.When exchange output sine wave positive half cycle, S1, S2, S5 are turned off and S3, S4 are open-minded, and the storage energy of C3 passes through S3, S4 And filtered by L1, C4 and realize that ac converter exports, inverter bridge leg midpoint d is to the voltage value at the ends a and C3 terminal voltages etc. at this time Current potential and with "+1 " refer to;When S4 is turned off, the energy for being stored in L1 realizes afterflow by S3, D7, at this time voltage values of the d to the ends a It is zero and is referred to " 0 ".When S1, S2 are opened, C3 is substantially to be connected in parallel, thus can reduce DC bus current line with C5 Wave.Meanwhile inverter bridge leg midpoint d and e generates "+1 ", " 0 ", " -1 " three kinds of level to the ends a, thus realize three electricity of inverter circuit Flat output.
From the foregoing, it can be seen that when exchange output sine wave negative half period, power switch tube S 1, S2 are only the work of power frequency low frequency switch And IGBT device can be used, S5 can be used MOSFET for high-frequency work during this period, can also be used when switching frequency is relatively low Fast recovery or SiC also can be used for high-frequency work during this period in IGBT, D6(Silicon carbide)Etc. types;Exchange output sine wave is just When half cycle, power switch tube S 3 is only the work of power frequency low frequency switch and IGBT device can be used, and S4 is high-frequency work during this period And MOSFET can be used, it can also be used IGBT, D7 also to can be used during this period for high-frequency work fast extensive when switching frequency is relatively low Multiple or SiC(Silicon carbide)Etc. types.Simultaneously as the bi-directional conductive of power switch tube and its body diode, it will be apparent that this DC/AC modules can realize the two-way flow of energy, to which system has active output and reactive power compensation planning.By S4 and D7 or In the same inverter bridge leg that S5 and D6 is respectively constituted, inside be only connected in series with by power switch tube and power diode, without There are switching tubes directly to connect, and also referred to as without dead-zone technique, this mode can eliminate Switch Cut-through risk, improve reliable operation Property.Five power switch tubes and two power diodes are the work of half power frequency period, two of which power switch tube, two Power diode HF switch in half of power frequency period works, and in addition power tube is open-minded there are two loop of power circuit, to drop Low-power consumption improves transfer efficiency, while reducing power device thermal stress, further increasing functional reliability.Power switch Pipe is switched on or off instruction and comes from control circuit or MCU(Microcontroller), modulated by using Unipolar SPWM and realize output "+1 ", " 0 ", " -1 " three kinds of level, to reduce the size and volume of internal passive device such as inductance, capacitance, alleviate Inverter weight, and further increase transfer efficiency.Meanwhile the high-frequency tube of internal circuit is using MOSFET and power frequency pipe makes With IGBT, DC/AC module costs are reduced to a certain extent.
Embodiment shown in Fig. 3 can be further simplified, and remove power diode D6, D7 and ac filter inductance L2, to The DC/AC module embodiments 2 of plus earth shown in Fig. 4 are constituted, the DC/AC module embodiments 2 of the utility model plus earth Structure is as shown in figure 4, including dc-link capacitance C5, inverter bridge, output filter circuit, be used to exchange output sine wave positive half cycle The striding capacitance C3 to power to inverter bridge with exchange output sine wave negative half period to striding capacitance C3 charging and to inverter bridge power supply Switching circuit.
Switching circuit includes power switch tube S 1, S2 and S3, and inverter bridge includes power switch tube S 4 and S5, exports filtered electrical Road includes ac filter inductance L1 and ac filter capacitance C4.
D1, D2, D3, D4 and D5 are respectively the body diode of the S5 of S1, S2, S3, S4.
The present embodiment externally has the port a, b, c, and the ends a are the anodes of DC/AC module direct-flow input ends, and the ends b are DC/AC moulds The cathode of block direct-flow input end, the ends c are the ac output ends of DC/AC modules, and the ends d are the midpoint of inverter bridge leg.
When exchange output sine wave negative half period, S1, S2, S5 are opened at this time and S3, S4 are turned off, the body two that C5 passes through S1, S2 Pole pipe D3 charges to C3, while realizing that ac converter exports by S1, S5 and by L1, C4 filtering, at this time in inverter bridge leg Point d mutually refers to the voltage value at the ends a with C5 terminal voltages with " -1 " instead;When S5 is turned off, C5 continues through the body diode of S1, S2 D3 gives C3 chargings, while being stored in the energy on L1 and realizing afterflow by S2, D4, at this time d to the voltage value at the ends a be zero and with " 0 " refers to.When exchange output sine wave positive half cycle, S1, S2, S5 are turned off and S3, S4 are open-minded, and the storage energy of C3 passes through S3, S4 And filtered by L1, C4 and realize that ac converter exports, inverter bridge leg midpoint d is to the voltage value at the ends a and C3 terminal voltages etc. at this time Current potential and with "+1 " refer to;When S4 is turned off, the energy for being stored in L1 realizes afterflow by S3, D5, at this time voltage values of the d to the ends a It is zero and is referred to " 0 ".When S1, S2 are opened, C3 is substantially to be connected in parallel, thus can reduce DC bus current line with C5 Wave.Meanwhile inverter bridge leg midpoint d generates "+1 ", " 0 ", " -1 " three kinds of level to the ends a, thus realize three level of inverter circuit Output.
From the foregoing, it can be seen that when exchange output sine wave negative half period, power switch tube S 1, S2 are only the work of power frequency low frequency switch And IGBT device can be used, S5 can be used MOSFET for high-frequency work during this period, can also be used when switching frequency is relatively low IGBT;When exchange output sine wave positive half cycle, power switch tube S 3 is only the work of power frequency low frequency switch and IGBT device can be used, MOSFET can be used for high-frequency work during this period in S4, and IGBT can also be used when switching frequency is relatively low.Simultaneously as power is opened Close the bi-directional conductive of pipe and its body diode, it will be apparent that this DC/AC module can realize the two-way flow of energy, to system With active output and reactive power compensation planning.Five power switch tubes are half of power frequency period work, and two of which power is opened It closes pipe HF switch in half of power frequency period to work, in addition power tube is open-minded there are two loop of power circuit, to reduce power Loss improves transfer efficiency, while reducing power device thermal stress, improving functional reliability.Power switch tube is switched on or off Instruction comes from control circuit or MCU(Microcontroller), by using Unipolar SPWM modulate realize output "+1 ", " 0 ", "- 1 " three kind of level, to reduce the size and volume of internal passive device such as inductance, capacitance, alleviate inverter weight, and And further increase transfer efficiency.Meanwhile the high-frequency tube of internal circuit using MOSFET and power frequency pipe use IGBT, certain DC/AC module costs are reduced in degree.

Claims (3)

1. a kind of DC/AC modules of photovoltaic generating system, including direct-flow input end, ac output end, dc-link capacitance, inversion Bridge and output filter circuit, dc-link capacitance are connected between the positive electrode and negative electrode of direct-flow input end, and output filter circuit is connected on Between inverter bridge and ac output end, which is characterized in that include for exchange the circumferential inverter bridge power supply of output the second half fly across Capacitance charges to striding capacitance and with the first half cycle of output is exchanged to the switching circuit that inverter bridge is powered, the input terminal of switching circuit Connect direct-flow input end, the output end at the both ends of striding capacitance charging and the input termination switch circuit of inverter bridge.
2. DC/AC modules according to claim 1, which is characterized in that switching circuit includes first switch pipe, second switch Pipe and third switching tube, inverter bridge include the 4th switching tube, the 5th switching tube, the 6th diode and the 7th diode, output filter Wave circuit includes the first ac filter inductance, the second ac filter inductance and the first ac filter capacitance;The height of second switch pipe Current potential terminates the cathode of the hot end and the 6th diode of the 4th switching tube, the low potential termination third switch of second switch pipe The hot end of pipe;The low potential of third switching tube terminates the cold end of the anode and the 5th switching tube of the 7th diode, the The cathode of seven diodes connects the cold end of the 4th switching tube, and the high potential of the 5th switching tube terminates the anode of the 6th diode; Striding capacitance is connected between the hot end of second switch pipe and the cold end of third switching tube;First ac filter inductance The cold end of first the 4th switching tube of termination, the second of second the second ac filter inductance of termination of the first ac filter inductance End, the hot end of the first the 5th switching tube of termination of the second ac filter inductance;First termination of the first ac filter capacitance The second end of first ac filter inductance, the second termination direct-flow input end of the first ac filter capacitance are simultaneously grounded;For cathode The DC/AC modules of ground connection, third switching tube include body diode, and the high potential termination direct-flow input end of first switch pipe is just Pole, low potential terminate the hot end of second switch pipe, and the cathode of the low potential termination direct-flow input end of second switch pipe simultaneously connects Ground;For the DC/AC modules of plus earth, second switch pipe includes body diode, and the low potential of first switch pipe terminates DC/AC The cathode of module direct current input, high potential terminate the cold end of third switching tube, and the high potential of third switching tube terminates direct current The anode of input terminal and ground connection.
3. DC/AC modules according to claim 1, which is characterized in that switching circuit includes the 11st switching tube, the 12nd Switching tube and the 13rd switching tube, inverter bridge include the 14th switching tube and the 15th switching tube, and output filter circuit includes the 11 ac filter inductance and the 11st ac filter capacitance;14th switching tube and the 15th switching tube include respectively two pole of body Pipe;The high potential of 12nd switching tube terminates the hot end of the 14th switching tube, the low potential termination of the 12nd switching tube the The hot end of 13 switching tubes;The low potential of 13rd switching tube terminates the cold end of the 15th switching tube, and the 14th opens Close the first end of the hot end and the 11st ac filter inductance of low potential the 15th switching tube of termination of pipe;Striding capacitance connects Between the hot end and the cold end of the 13rd switching tube of the 12nd switching tube;The first of 11st ac filter capacitance The first ac output end as DC/AC modules is held, the second end of the 11st ac filter inductance, the 11st ac filter electricity are connect Second ac output end of the second end of appearance as DC/AC modules, the ground terminal of direct-flow input end;For the DC/ of cathode ground connection AC modules, the 13rd switching tube includes body diode, the anode of the high potential termination direct-flow input end of the 11st switching tube, low electricity The low potential of the hot end of position the 12nd switching tube of termination, the 12nd switching tube terminates cathode and the ground connection of direct current input;It is right In the DC/AC modules of plus earth, the 12nd switching tube includes body diode, and the low potential termination direct current of the 11st switching tube is defeated Enter the cathode at end, high potential terminates the cold end of the 13rd switching tube, the high potential termination direct current input of the 13rd switching tube The anode at end and ground connection.
CN201820123362.3U 2018-01-24 2018-01-24 A kind of DC/AC modules of photovoltaic generating system Expired - Fee Related CN207691701U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109921673A (en) * 2019-02-28 2019-06-21 全球能源互联网研究院有限公司 An inverter and its control method
US11641153B2 (en) 2020-07-06 2023-05-02 Delta Electronics, Inc. Power conversion module
US11811217B2 (en) 2021-01-19 2023-11-07 Huawei Digital Power Technologies Co., Ltd. Fault protection apparatus and photovoltaic power generation system
US11923772B2 (en) 2020-07-06 2024-03-05 Delta Electronics, Inc. DC/DC converter for decreasing power loss caused parasitic resistance and increasing equivalent capacitance of high-voltage side capacitor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109921673A (en) * 2019-02-28 2019-06-21 全球能源互联网研究院有限公司 An inverter and its control method
US11641153B2 (en) 2020-07-06 2023-05-02 Delta Electronics, Inc. Power conversion module
US11923772B2 (en) 2020-07-06 2024-03-05 Delta Electronics, Inc. DC/DC converter for decreasing power loss caused parasitic resistance and increasing equivalent capacitance of high-voltage side capacitor
US11811217B2 (en) 2021-01-19 2023-11-07 Huawei Digital Power Technologies Co., Ltd. Fault protection apparatus and photovoltaic power generation system

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