CN103178741A - Interleaved parallel switch full-bridge inverter and interleaved parallel control method - Google Patents
Interleaved parallel switch full-bridge inverter and interleaved parallel control method Download PDFInfo
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- CN103178741A CN103178741A CN2013100685644A CN201310068564A CN103178741A CN 103178741 A CN103178741 A CN 103178741A CN 2013100685644 A CN2013100685644 A CN 2013100685644A CN 201310068564 A CN201310068564 A CN 201310068564A CN 103178741 A CN103178741 A CN 103178741A
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Abstract
The invention discloses an interleaved parallel switch full-bridge inverter and an interleaved parallel control method. The interleaved parallel switch full-bridge inverter comprises an input capacitor, a first diode, a second diode, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a first inductor and a second inductor. The inverter has the advantage that size and weight of the inductors are reduced, and quantity of the switch tubes is decreased; the problems of reverse recovery of the diodes and the like are avoided, and efficiency and reliability are improved; common-mode voltage between a direct-current bus and an alternating-current bus is mainly low-frequency variable voltage to be beneficial to reducing of size of an EMI (electro-magnetic interference) filter; when sizes of output inductive current ripples are same, switch interleaving is beneficial to reducing of output filter inductance, so that input current is continuous, and input filters are decreased; and coupling inductance is conducive to inductance multiplexing to further reduce filter inductance.
Description
Technical field
The present invention relates to the converters field, relate in particular to a kind of combining inverter.
Background technology
Combining inverter is the bridge between solar cell and electrical network, is related to the height of photoelectric conversion efficiency.in order to improve the power output of combining inverter, usually adopt the mode of crisscross parallel, as shown in Figure 1, solar cell DC provides the direct current energy that is converted to by solar energy, diode D1, diode D2, switching tube S1, switching tube S2, switching tube S3, switching tube S4, inductor L1 and inductor L2 have consisted of the first inverter circuit, diode D3, diode D4, switching tube S5, switching tube S6, switching tube S7, switching tube S8, inductor L3 and inductor L4 have consisted of the second inverter circuit, the first inverter circuit and the second inverter circuit crisscross parallel, jointly provide AC energy to electrical network AC.Crisscross parallel inverter circuit shown in Figure 1 needs 4 inductors, and the volume and weight of inverter circuit is mainly determined by inductor, and therefore, the volume of this inverter circuit is large, Heavy Weight, and needs 8 switching tubes, has increased circuit cost.
Summary of the invention
Goal of the invention: be problem and the defective that overcomes above-mentioned existence, the present invention proposes a kind of crisscross parallel switch full inverter and crisscross parallel control method, solved that existing crisscross parallel inverter volume is large, Heavy Weight, problem that switching tube is many.
Technical scheme: for solving the problems of the technologies described above, the present invention is by the following technical solutions: a kind of crisscross parallel switch full inverter, comprise input capacitance, the first diode, the second diode, the first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube, the first inductor and the second inductor, wherein:
The positive pole of input capacitance is connected with negative pole with the positive pole of DC power supply and is connected with negative pole;
Second switch Guan Yudi five paralleled power switches, the one end is connected with the first diode cathode, and the other end is connected with the negative pole of input capacitance, and the negative electrode of the first diode is connected with the positive pole of input capacitance simultaneously;
The 4th switching tube and the 6th paralleled power switches, the one end is connected with the second diode cathode, and the other end is connected with the input capacitance negative pole, and the negative electrode of the second diode is connected with the positive pole of input capacitance simultaneously;
The first inductor, its first end is connected with the first diode anode, and its second end is connected with the first input end of AC network, is provided with the first switching tube between the positive pole of the second end and input capacitance simultaneously;
The second inductor, its first end is connected with the second diode anode, and the second input of its second end and AC network is practiced level, is provided with the second switch pipe between the positive pole of the second end and input capacitance simultaneously.
As preferably, described the first inductor comprises the first leakage inductance and the first magnetizing inductance that is connected in series, and described the second inductor comprises the second leakage inductance and the second magnetizing inductance that is connected in series, and described the first magnetizing inductance and the coupling of the second magnetizing inductance differential mode.
As preferably, described the first magnetizing inductance is identical with the inductance value of the second magnetizing inductance.
Optionally, described the first inductor comprises the first magnetizing inductance and the 3rd magnetizing inductance that is connected in series, described the second inductor comprises the second magnetizing inductance and the 4th magnetizing inductance that is connected in series, the first magnetizing inductance and the coupling of the second magnetizing inductance differential mode, the 3rd magnetizing inductance and the coupling of the 4th magnetizing inductance common mode.
As preferably, described the first magnetizing inductance is identical with the inductance value of the second magnetizing inductance, and the 3rd magnetizing inductance is identical with the inductance value of the 4th magnetizing inductance.
The present invention also provides a kind of crisscross parallel control method based on above-mentioned crisscross parallel switch full inverter, comprises the following steps:
The positive half cycle of line voltage, the first switching tube normal open, the 3rd switching tube, the 5th switching tube and second switch pipe are normally closed, the 6th switching tube and the 4th switching tube HF switch of interlocking, when the 6th switching tube or the 4th switching tube conducting, electric current flow through input DC power, the first switching tube, AC network, the second inductor, the 6th switching tube or the 4th switching tube; The 6th switching tube and the 4th switching tube close has no progeny, freewheel current flow through the first switching tube, AC network, the second inductor and the second diode;
The line voltage negative half period, the 3rd switching tube normal open, the first switching tube, the 4th switching tube and the 6th switching tube are normally closed, the 5th switching tube and the second switch pipe HF switch of interlocking, when the 5th switching tube or the conducting of second switch pipe, electric current flow through input DC power, the 3rd switching tube, AC network, the first inductor, the 5th switching tube or second switch pipe; The 5th switching tube and second switch pipe close has no progeny, freewheel current flow through the 3rd switching tube, AC network, the first inductor and the first diode; Only open each in the second, the 5th and the 4th, the 6th switching tube when underloading, with further raising light-load efficiency.
Beneficial effect: compared with prior art, the present invention has the following advantages: (1) can reduce the volume and weight of inductor, and reduces the quantity of switching tube; (2) the freewheel current independent diode of flowing through, avoided the problems such as body diode reverse recovery, raises the efficiency; (3) the straight-through problem of no bridge type inverter leg, improve reliability; (4) between dc bus ground and ac bus ground, common-mode voltage is mainly low frequency variations voltage, helps to reduce the electromagnetic interface filter size; (5) when identical outputting inductance current ripples size, switch is staggered is conducive to reduce output inductor, makes continuous input current, reduces input filter; (6) coupling inductance helps inductor multiplexing, further reduces filter inductance.
Description of drawings
Fig. 1 is the circuit diagram of existing crisscross parallel inverter;
Fig. 2 is the exemplary circuit figure of the described crisscross parallel switch full of the embodiment of the present invention 1 inverter;
Fig. 3 is the structural representation of the first inductor and the second inductor in the described crisscross parallel switch full of the embodiment of the present invention 2 inverter;
Fig. 4 is the structural representation of the first inductor and the second inductor in the described crisscross parallel switch full of the embodiment of the present invention 3 inverter.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
As shown in Figure 2, crisscross parallel switch full inverter of the present invention receives the input direct voltage DC from solar cell, the output AC electric energy is to AC network AC, comprise: input capacitance C20, its positive pole is connected to the positive input of input DC power DC, and its negative pole is connected to the earth potential of input DC power DC; The first diode D10, its negative electrode is connected to the positive pole of input capacitance C20, and its anodic bonding is to the first end of the first inductor L10, and the second end of the first inductor L10 is connected to the first input end of AC network AC; The second diode D2, its negative electrode is connected to the positive pole of input capacitance C20, and its anodic bonding is to the first end of the second inductor L20, and the second end of the second inductor L20 is connected to the second input of AC network AC; The first switching tube S10, its first end is connected to the positive pole of input capacitance C20, and its second end is connected to the second end of the first inductor L10; Second switch pipe S20, its first end is connected to the anode of the first diode D10, and its second end is connected to the negative pole of input capacitance C20; The 3rd switching tube S3, its first end is connected to the positive pole of input capacitance C20, and its second end is connected to the second end of the second inductor L20; The 4th switching tube S40, its first end is connected to the first end of the second inductor L20, and its second end is connected to the negative pole of input capacitance C20; The 5th switching tube S50, S20 is in parallel with the second switch pipe; The 6th switching tube S60, in parallel with the 4th switching tube S40.
An embodiment of crisscross parallel switch full inverter of the present invention the first inductor and the second inductor has been shown in Fig. 2, the first inductor L10 and the second inductor L20 are separated structures, need two magnetic cores, can adopt the integrated mode of magnetic to realize sharing of magnetic core, further reduce the volume and weight of inductor.
Embodiment 2
as shown in Figure 3, in the present embodiment, another embodiment of crisscross parallel switch full inverter the first inductor and the second inductor, the first inductor L10 comprises the first leakage inductance LS1 and the first magnetizing inductance LM1 that is connected in series, the second inductor L20 comprises the second leakage inductance LS2 and the second magnetizing inductance LM2 that is connected in series, the first leakage inductance LS1, the second leakage inductance LS2, the first magnetizing inductance LM1 and the second magnetizing inductance LM2 share a magnetic core, the first magnetizing inductance LM1 and the coupling of the second magnetizing inductance LM2 differential mode, preferably, the first magnetizing inductance LM1 is identical with the inductance value of the second magnetizing inductance LM2.
as shown in Figure 4, the present embodiment, another embodiment of crisscross parallel switch full inverter the first inductor and the second inductor, the first inductor L10 comprises the first magnetizing inductance LM1 and the 3rd magnetizing inductance LM3 that is connected in series, the second inductor L20 comprises the second magnetizing inductance LM2 and the 4th magnetizing inductance LM4 that is connected in series, the first magnetizing inductance LM1, the second magnetizing inductance LM2, the 3rd magnetizing inductance LM3 and the 4th magnetizing inductance LM4 share a magnetic core, the first magnetizing inductance LM1 and the coupling of the second magnetizing inductance LM2 differential mode, the 3rd magnetizing inductance LM3 and the coupling of the 4th magnetizing inductance LM4 common mode, preferably, the first magnetizing inductance LM1 is identical with the inductance value of the second magnetizing inductance LM2, the 3rd magnetizing inductance LM3 is identical with the inductance value of the 4th magnetizing inductance LM4.
Crisscross parallel switch full inverter of the present invention can reduce the volume and weight of inductor, and reduces the quantity of switching tube; The freewheel current independent diode of flowing through has been avoided the problems such as body diode reverse recovery, raises the efficiency; The no bridge type inverter leg leads directly to problem, improves reliability; Between dc bus ground and ac bus ground, common-mode voltage is mainly low frequency variations voltage, helps to reduce the electromagnetic interface filter size; When identical outputting inductance current ripples size, switch is staggered is conducive to reduce output inductor, makes continuous input current, reduces input filter; Coupling inductance helps inductor multiplexing, further reduces filter inductance.
The present invention also provides a kind of crisscross parallel control method, is applicable to above-mentioned crisscross parallel switch full inverter, comprises the following steps:
The positive half cycle of line voltage, the first switching tube S10 normal open, the 3rd switching tube S30, the 5th switching tube S50 and second switch pipe S20 are normally closed, the 6th switching tube S60 and the 4th switching tube S40 HF switch of interlocking, when the 6th switching tube S60 or the 4th switching tube S40 conducting, electric current flow through input DC power DC, the first switching tube S10, AC network AC, the second inductor L20, the 6th switching tube S60 or the 4th switching tube S40; The 6th switching tube S60 and the 4th switching tube S40 close and have no progeny, freewheel current flow through the first switching tube S10, AC network AC, the second inductor L20 and the second diode D20;
The secondary half cycle of line voltage, the 3rd switching tube S30 normal open, the first switching tube S10, the 4th switching tube S40 and the 6th switching tube S60 are normally closed, the 5th switching tube S50 and the second switch pipe S20 HF switch of interlocking, when the 5th switching tube S50 or second switch pipe S20 conducting, electric current flow through input DC power DC, the 3rd switching tube S30, AC network AC, the first inductor L10, the 5th switching tube S50 or second switch pipe S20; The 5th switching tube S50 and second switch pipe S20 close and have no progeny, freewheel current flow through the 3rd switching tube S30, AC network AC, the first inductor L10 and the first diode D10.Crisscross parallel control method of the present invention, simple and reliable, can effectively avoid the bridge arm direct pass problem.
Claims (6)
1. crisscross parallel switch full inverter, it is characterized in that: comprise input capacitance, the first diode, the second diode, the first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube, the first inductor and the second inductor, wherein:
The positive pole of input capacitance is connected with negative pole with the positive pole of DC power supply and is connected with negative pole;
Second switch Guan Yudi five paralleled power switches, the one end is connected with the first diode cathode, and the other end is connected with the negative pole of input capacitance, and the negative electrode of the first diode is connected with the positive pole of input capacitance simultaneously;
The 4th switching tube and the 6th paralleled power switches, the one end is connected with the second diode cathode, and the other end is connected with the input capacitance negative pole, and the negative electrode of the second diode is connected with the positive pole of input capacitance simultaneously;
The first inductor, its first end is connected with the first diode anode, and its second end is connected with the first input end of AC network, is provided with the first switching tube between the positive pole of the second end and input capacitance simultaneously;
The second inductor, its first end is connected with the second diode anode, and the second input of its second end and AC network is practiced level, is provided with the second switch pipe between the positive pole of the second end and input capacitance simultaneously.
2. crisscross parallel switch full inverter according to claim 1, it is characterized in that: described the first inductor comprises the first leakage inductance and the first magnetizing inductance that is connected in series, described the second inductor comprises the second leakage inductance and the second magnetizing inductance that is connected in series, and described the first magnetizing inductance and the coupling of the second magnetizing inductance differential mode.
3. crisscross parallel switch full inverter according to claim 2, it is characterized in that: described the first magnetizing inductance is identical with the inductance value of the second magnetizing inductance.
4. interlock according to claim 1 and the switch full inverter, it is characterized in that: described the first inductor comprises the first magnetizing inductance and the 3rd magnetizing inductance that is connected in series, described the second inductor comprises the second magnetizing inductance and the 4th magnetizing inductance that is connected in series, the first magnetizing inductance and the coupling of the second magnetizing inductance differential mode, the 3rd magnetizing inductance and the coupling of the 4th magnetizing inductance common mode.
5. crisscross parallel switch full inverter according to claim 4, it is characterized in that: described the first magnetizing inductance is identical with the inductance value of the second magnetizing inductance, and the 3rd magnetizing inductance is identical with the inductance value of the 4th magnetizing inductance.
6. crisscross parallel control method based on the arbitrary described crisscross parallel switch full inverter of claim 1～5 is characterized in that comprising the following steps:
The positive half cycle of line voltage, the first switching tube normal open, the 3rd switching tube, the 5th switching tube and second switch pipe are normally closed, the 6th switching tube and the 4th switching tube HF switch of interlocking, when the 6th switching tube or the 4th switching tube conducting, electric current flow through input DC power, the first switching tube, AC network, the second inductor, the 6th switching tube or the 4th switching tube; The 6th switching tube and the 4th switching tube close has no progeny, freewheel current flow through the first switching tube, AC network, the second inductor and the second diode;
The line voltage negative half period, the 3rd switching tube normal open, the first switching tube, the 4th switching tube and the 6th switching tube are normally closed, the 5th switching tube and the second switch pipe HF switch of interlocking, when the 5th switching tube or the conducting of second switch pipe, electric current flow through input DC power, the 3rd switching tube, AC network, the first inductor, the 5th switching tube or second switch pipe; The 5th switching tube and second switch pipe close has no progeny, freewheel current flow through the 3rd switching tube, AC network, the first inductor and the first diode;
Can only open each in the second, the 5th and the 4th, the 6th switching tube when underloading, with further raising light-load efficiency.
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| CN2013100685644A CN103178741A (en) | 2013-03-04 | 2013-03-04 | Interleaved parallel switch full-bridge inverter and interleaved parallel control method |
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Cited By (2)
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| CN103346690A (en) * | 2013-07-05 | 2013-10-09 | 华为技术有限公司 | Multi-level inverter and power supply system |
| CN117411307A (en) * | 2023-10-23 | 2024-01-16 | 哈尔滨工业大学 | Single-stage bridgeless PFC converter suitable for wide intermediate frequency AC/DC power supply system |
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Application publication date: 20130626 |