CN105743382A - DC-AC conversion device and inverter based on same - Google Patents
DC-AC conversion device and inverter based on same Download PDFInfo
- Publication number
- CN105743382A CN105743382A CN201610137524.4A CN201610137524A CN105743382A CN 105743382 A CN105743382 A CN 105743382A CN 201610137524 A CN201610137524 A CN 201610137524A CN 105743382 A CN105743382 A CN 105743382A
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- Prior art keywords
- power tube
- chopper circuit
- outfan
- electric capacity
- storage module
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
Abstract
The invention relates to a DC-AC conversion device, which comprises an energy storage module, a first chopper circuit, a second chopper circuit and a filter circuit, wherein the energy storage module is connected with a DC source and is used for filtering interference and a high-frequency variation; the first chopper circuit is connected with the energy storage module and is used for converting a DC voltage into an AC voltage changing according to the sine rule; the second chopper circuit is connected with the energy storage module and is used for converting the DC voltage into the AC voltage changing according to the sine rule; the filter circuit is connected with the first chopper circuit and the second chopper circuit; and an output end of the filter circuit is the output end of the DC-AC conversion device and is connected with an AC power supply or a load. According to the DC-AC conversion device, the efficiency can be improved, the cost can be reduced and the volume can be reduced, so that the cost of a system is reduced. The conversion efficiency can also be improved; the reliability of the system is improved; the earth leakage current of the system is reduced; and the performance index of output electric energy is improved.
Description
Technical field
The present invention relates to electric and electronic technical field, be specifically related to a kind of inverter circuit and apply the inverter of this inverter circuit.
Background technology
At present, in the device of converting direct-current power into alternating-current power, in order to improve conversion efficiency as far as possible and reduce hardware cost, generally use the scheme of inverter without transformer.In grid-connected photovoltaic system, the subject matter applying this non-isolation type inverter to bring is intended to suppression system leakage current over the ground.When high frequency switching device may produce high frequency, time variant voltage acts in parasitic capacitance so that system produces leakage current and can exceed that permissible value.This high-frequency leakage current can reduce system effectiveness, affects the quality of power supply, increases electromagnetic interference.It is thus desirable to effectively suppress or be completely eliminated leakage current, strengthen reliability and the safety of system.
In full-bridge non-isolated system, suppression leakage current generally has two kinds of ways, and one is to take bipolar modulation so that system common-mode voltage over the ground goes to zero, to reach to suppress the purpose of leakage current；Another kind is to take unipolarity modulation system, by increasing drain current suppressing device in systems to reduce leakage current.The problem that the former exists, bipolar modulation makes filter inductance ripple increase, and needs to be greatly increased the sensibility reciprocal of filter inductance and volume, not only increases cost, also reduce efficiency.The latter there is problems of, and adds extra filter circuit, too increases the cost of system, and EMC Design difficulty increases.
Accordingly, it would be desirable to design the system of a kind of high efficiency low-leakage current, unipolarity modulation system to be taked in modulation system, system structure needs increase a small amount of device, by controlling continuous current circuit to reach to eliminate the purpose of high frequency common mode voltage.
Summary of the invention
It is an object of the invention to provide a kind of economical and practical, safe and reliable inverter circuit DC-AC conversion equipment.
For reaching above-mentioned purpose, the technical solution used in the present invention is:
A kind of DC-AC conversion equipment, including be connected with DC source for filtering interfering and the energy-storage module of high frequency variable quantity, be connected with described energy-storage module for the first chopper circuit by DC voltage conversion being alternating voltage by sinusoidal rule change, be connected with described energy-storage module for the second chopper circuit by DC voltage conversion being alternating voltage by sinusoidal rule change, the filter circuit being connected with described first chopper circuit and described second chopper circuit, the outfan of described filter circuit is the outfan of described DC-AC conversion equipment and is connected with alternating current power supply or load.
Preferably, described energy-storage module includes the electric capacity C1 being in series and electric capacity C2 being connected to the outfan of described DC source, and described electric capacity C1 is connected with described filter circuit with the junction point of electric capacity C2.
Preferably, described first chopper circuit includes power tube T1, power tube T3, power tube T5 and diode D1；One end of described power tube T1 is the input of described first chopper circuit and is connected with the outfan of described energy-storage module, described power tube T1 is connected one end of described power tube T3 with the junction point of described energy-storage module, the other end of described power tube T3 connects one end of described power tube T5, the other end of described power tube T5 is first outfan of described first chopper circuit, described power tube T3 is connected the negative pole of described diode D1 with the junction point of described power tube T5, the other end of the positive pole described power tube T1 of connection of described diode D1 forms second outfan of described first chopper circuit；
Described second chopper circuit includes power tube T2, power tube T4, power tube T6 and diode D2；One end of described power tube T2 is the input of described second chopper circuit and is connected with the outfan of described energy-storage module, described power tube T2 is connected one end of described power tube T4 with the junction point of described energy-storage module, the other end of described power tube T4 connects one end of described power tube T6, the other end of described power tube T6 is first outfan of described second chopper circuit, described power tube T4 is connected the positive pole of described diode D2 with the junction point of described power tube T6, the other end of the negative pole described power tube T2 of connection of described diode D2 forms second outfan of described second chopper circuit；
First outfan of described first chopper circuit and first outfan of described second chopper circuit connects altogether, second outfan of second outfan of described first chopper circuit and described second chopper circuit connects altogether.
Preferably, described filter circuit includes inductance L1, inductance L2, electric capacity C3, electric capacity C4；One end of described inductance L1, the input that one end is described filter circuit of described inductance L2 and be connected with the outfan of the outfan of described first chopper circuit and described second chopper circuit, the other end of described inductance L1 concatenates one end of described electric capacity C3, the other end of described inductance L2 concatenates one end of described electric capacity C4, the other end of described electric capacity C3, the other end of described electric capacity C4 is connected and is connected with described energy-storage module, the junction point of described inductance L1 and described electric capacity C3, the outfan that junction point is described filter circuit of described inductance L2 and described electric capacity C4.
Preferably, described power tube T1, described power tube T2, described power tube T3, described power tube T4, described power tube T5, described power tube T6 are MOSFET semiconductor switch device.
Preferably, described power tube T1, described power tube T2, described power tube T3, described power tube T4 are high frequency power pipe.
The present invention also provides for a kind of inverter, and it includes above-mentioned DC-AC conversion equipment.
Owing to technique scheme is used, the present invention compared with prior art has the advantage that the DC-AC conversion equipment of the present invention and inverter based on it can improve efficiency, reduces cost, reduces volume, and then reduces system cost；Conversion efficiency can also be improved, increase system reliability, reduce the Ground leakage current of system, improve the performance indications of output electric energy.
Accompanying drawing explanation
Accompanying drawing 1 is the theory diagram of the present invention.
Accompanying drawing 2 is the circuit diagram of the present invention.
Accompanying drawing 3 is that the present invention is at the positive half cycle of alternating current, current loop schematic diagram during high-frequency tube conducting.
Accompanying drawing 4 is that the present invention is at the positive half cycle of alternating current, current loop schematic diagram when high-frequency tube turns off.
Accompanying drawing 5 is that the present invention is at alternating current negative half period, current loop schematic diagram during high-frequency tube conducting.
Accompanying drawing 6 is that the present invention is at alternating current negative half period, current loop schematic diagram when high-frequency tube turns off.
Accompanying drawing 7 is the circuit diagram of inverter in embodiments of the invention.
Accompanying drawing 8 is the action timing diagram of embodiments of the invention breaker in middle pipe.
Accompanying drawing 9 is the simulation result figure of embodiments of the invention.
In the figures above: 100, DC source；200, load or alternating current power supply；300, storage modulus；400, the first chopper circuit；500, the second chopper circuit；600, filter circuit.
Detailed description of the invention
The invention will be further described for embodiment shown in below in conjunction with the accompanying drawings.
Embodiment one: see shown in accompanying drawing 1 and accompanying drawing 2, a kind of DC-AC conversion equipment, including energy-storage module the 300, first chopper circuit the 400, second chopper circuit 500 and filter circuit 600.
DC source 100 uses photovoltaic battery panel.The input of energy-storage module 300 is connected with positive and negative two outfans of DC source 100, and it is for filtering interference and the high frequency variable quantity of DC source 100 output.Energy-storage module 300 includes the electric capacity C1 being in series and electric capacity C2 being connected to the outfan of DC source 100.The junction point of electric capacity C1 and the junction point of DC source 100, electric capacity C2 and DC source 100 constitutes the outfan of energy-storage module 300.
The input of the first chopper circuit 400, input all outfans with energy-storage module 300 of the second chopper circuit 500 are connected, and it is the alternating voltage by sinusoidal rule change that the input of the first chopper circuit 400, the second chopper circuit 500 are used to DC voltage conversion.First chopper circuit 400 includes power tube T1, power tube T3, power tube T5 and diode D1.One end of power tube T1 is the input of the first chopper circuit 400 and is connected with the outfan of energy-storage module 300, power tube T1 is connected one end of power tube T3 with the junction point of energy-storage module 300, the other end of power tube T3 connects one end of power tube T5, the other end of power tube T5 is first outfan of the first chopper circuit 400, the junction point of power tube T3 and power tube T5 is connected the negative pole of diode D1, and the other end of the positive pole connection power tube T1 of diode D1 forms second outfan of the first chopper circuit 400.Second chopper circuit 500 includes power tube T2, power tube T4, power tube T6 and diode D2.One end of power tube T2 is the input of the second chopper circuit 500 and is connected with the outfan of energy-storage module 300, power tube T2 is connected one end of power tube T4 with the junction point of energy-storage module 300, the other end of power tube T4 connects one end of power tube T6, the other end of power tube T6 is first outfan of the second chopper circuit 500, the junction point of power tube T4 and power tube T6 is connected the positive pole of diode D2, and the other end of the negative pole connection power tube T2 of diode D2 forms second outfan of the second chopper circuit 500.First outfan of the first chopper circuit 400 and first outfan of the second chopper circuit 500 connects altogether, second outfan of second outfan of the first chopper circuit 400 and the second chopper circuit 500 connects altogether, thus form the first chopper circuit 400 and the common outfan of the second chopper circuit 500.Power tube T1, power tube T2, power tube T3, power tube T4, power tube T5, power tube T6 are MOSFET semiconductor switch device, wherein, power tube T1, power tube T2, power tube T3, power tube T4 are high frequency power pipe, and high frequency power pipe T1-T4 in kHz frequency range by pulse-triggered；High-frequency impulse is pulse-width signal PWM.
The input of filter circuit 600 and the outfan of the first chopper circuit 400 and the second chopper circuit 500 are connected.Filter circuit 600 includes inductance L1, inductance L2, electric capacity C3, electric capacity C4.nullOne end of inductance L1、One end of inductance L2 is the input of filter circuit 600 and is connected with the outfan of the first chopper circuit 400 and the outfan of the second chopper circuit 500，First outfan being i.e. respectively connecting to first outfan by the first chopper circuit 400 and the second chopper circuit 500 connects the outfan formed altogether and is connect, by second outfan of the first chopper circuit 400 and second outfan of the second chopper circuit 500, the outfan formed altogether，One end of the other end serial capacitance C3 of inductance L1，One end of the other end serial capacitance C4 of inductance L2，The other end of electric capacity C3、The other end of electric capacity C4 is connected and is connected with energy-storage module 300，It is connected to electric capacity C1 and the junction point of electric capacity C2，The junction point of inductance L1 and electric capacity C3、The outfan that junction point is filter circuit 600 of inductance L2 and electric capacity C4，The outfan of this filter circuit 600 is the outfan of DC-AC conversion equipment and connects load or alternating current power supply 200.
Then constitute the inverter of grid-connected use with alternating current power supply 200 when above-mentioned DC-AC conversion equipment is connected, the frequency of its alternating current power supply 200 is usually 50Hz or 60Hz, as shown in Figure 7.
First chopper circuit 400 works at the positive half cycle of alternating current, and power tube T3 is controlled by high-frequency PWM signal, has wanted the inversion work of positive half cycle, and the first chopper circuit 400 remains a need for additional two power tubes, i.e. power tube T2 and power tube T5.The control signal that power tube T2 is identical with power tube T3 reception, they synchronous workings, during selector, their model is the most identical with parameter.Power tube T5 works in power frequency pattern, turns on when positive half cycle, is off at negative half period.The action sequence of power tube refers to Fig. 8.
Second chopper circuit 500 works at alternating current negative half period, and power tube T1 is controlled by high-frequency PWM signal, has wanted the inversion work of negative half period, and the second chopper circuit 500 remains a need for additional two power tubes, i.e. power tube T4 and power tube T6.The control signal that power tube T4 is identical with power tube T1 reception, they synchronous workings, during selector, their model is the most identical with parameter.Power tube T6 works in power frequency pattern, turns on when negative half period, is off at positive half cycle.The action sequence of power tube refers to Fig. 8.
Above-mentioned inverter circuit has four kinds of operation modes:
As shown in Figure 3, the first operation mode of DC-AC conversion equipment: power tube T2, power tube T3 and power tube T5 conducting, the rising of inductance L1, inductance L2 electric current, energy-storage module 300 exports energy, gives load 200 power supply.
As shown in Figure 4, the second operation mode of DC-AC conversion equipment: power tube T2, power tube T3 turn off, and power tube T5 is held on, inductance L1, inductance L2 electric current are through diode D1 afterflow, electric current declines, and energy-storage module 300 stops output energy, receives the electric energy of DC source 100.
The i.e. positive half cycle of alternating current, power tube T2, power tube T3 synchronize HF switch, and power tube T5 is constantly on, and when power tube T2 and power tube T3 turns off, diode D1 forward direction turns on, and when power tube T2 and power tube T3 turns on, diode D1 reversely ends.
As shown in Figure 5, the 3rd operation mode of DC-AC conversion equipment: power tube T1, power tube T4 and power tube T6 conducting, the rising of inductance L1, inductance L2 electric current, energy-storage module 300 exports energy, gives load 200 power supply.
As shown in Figure 6, the 4th operation mode of DC-AC conversion equipment: power tube T1, power tube T4 turn off, and power tube T6 is held on, inductance L1, inductance L2 electric current are through diode D2 afterflow, electric current declines, and energy-storage module 300 stops output energy, receives the electric energy of DC source 100.
I.e. at alternating current negative half period, power tube T1, power tube T4 synchronize HF switch, and power tube T6 is constantly on, and when power tube T1 and power tube T4 turns off, diode D2 forward direction turns on, and when power tube T1 and power tube T4 turns on, diode D2 reversely ends.
In the present embodiment, the midpoint that connects of filter capacitor C3 and filter capacitor C4 is connected with the connection midpoint of storage capacitor C1 and storage capacitor C2, can reduce system leakage current over the ground further.Fig. 9 gives the simulation result of the present embodiment, output AC electric current and alternating voltage Complete Synchronization, and the output AC quality of power supply is high, and current harmonics is little, and system leakage current is little, and leakage current virtual value is less than 10mA.The present embodiment emulates in the case of straight-flow system is 500nF to the earth parasitic capacitance.
Part that the present invention does not relate to is the most same as the prior art maybe can use prior art to be realized.Above-described embodiment only for technology design and the feature of the present invention are described, its object is to allow person skilled in the art will appreciate that present disclosure and to implement according to this, can not limit the scope of the invention with this.All equivalence changes made according to spirit of the invention or modification, all should contain within protection scope of the present invention.
Claims (7)
1. a DC-AC conversion equipment, it is characterized in that: it includes the energy-storage module for filtering interfering and high frequency variable quantity (300) being connected with DC source (100), be connected with described energy-storage module (300) for the first chopper circuit (400) by DC voltage conversion being alternating voltage by sinusoidal rule change, be connected with described energy-storage module (300) for the second chopper circuit (500) by DC voltage conversion being alternating voltage by sinusoidal rule change, the filter circuit (600) being connected with described first chopper circuit (400) and described second chopper circuit (500), the outfan of described filter circuit (600) be described DC-AC conversion equipment outfan and with alternating current power supply or load (200) be connected.
DC-AC conversion equipment the most according to claim 1, it is characterized in that: described energy-storage module (300) includes being connected to the electric capacity C1 being in series and electric capacity C2 of the outfan of described DC source (100), and described electric capacity C1 is connected with described filter circuit (600) with the junction point of electric capacity C2.
DC-AC conversion equipment the most according to claim 1, it is characterised in that: described first chopper circuit (400) includes power tube T1, power tube T3, power tube T5 and diode D1；One end of described power tube T1 is the input of described first chopper circuit (400) and is connected with the outfan of described energy-storage module (300), described power tube T1 is connected one end of described power tube T3 with the junction point of described energy-storage module (300), the other end of described power tube T3 connects one end of described power tube T5, the other end of described power tube T5 is first outfan of described first chopper circuit (400), described power tube T3 is connected the negative pole of described diode D1 with the junction point of described power tube T5, the other end of the positive pole described power tube T1 of connection of described diode D1 forms second outfan of described first chopper circuit (400)；
Described second chopper circuit (500) includes power tube T2, power tube T4, power tube T6 and diode D2；One end of described power tube T2 is the input of described second chopper circuit (500) and is connected with the outfan of described energy-storage module (300), described power tube T2 is connected one end of described power tube T4 with the junction point of described energy-storage module (300), the other end of described power tube T4 connects one end of described power tube T6, the other end of described power tube T6 is first outfan of described second chopper circuit (500), described power tube T4 is connected the positive pole of described diode D2 with the junction point of described power tube T6, the other end of the negative pole described power tube T2 of connection of described diode D2 forms second outfan of described second chopper circuit (500)；
First outfan of described first chopper circuit (400) and first outfan of described second chopper circuit (500) connects altogether, second outfan of second outfan of described first chopper circuit (400) and described second chopper circuit (500) connects altogether.
DC-AC conversion equipment the most according to claim 1, it is characterised in that: described filter circuit (600) includes inductance L1, inductance L2, electric capacity C3, electric capacity C4；One end of described inductance L1, one end of described inductance L2 is the input of described filter circuit (600) and is connected with the outfan of described first chopper circuit (400) and the outfan of described second chopper circuit (500), the other end of described inductance L1 concatenates one end of described electric capacity C3, the other end of described inductance L2 concatenates one end of described electric capacity C4, the other end of described electric capacity C3, the other end of described electric capacity C4 is connected and is connected with described energy-storage module (300), the junction point of described inductance L1 and described electric capacity C3, the outfan that junction point is described filter circuit (600) of described inductance L2 and described electric capacity C4.
DC-AC conversion equipment the most according to claim 4, it is characterised in that: described power tube T1, described power tube T2, described power tube T3, described power tube T4, described power tube T5, described power tube T6 are MOSFET semiconductor switch device.
DC-AC conversion equipment the most according to claim 4, it is characterised in that: described power tube T1, described power tube T2, described power tube T3, described power tube T4 are high frequency power pipe.
7. an inverter, it is characterised in that: it includes the DC-AC conversion equipment according to any one of claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610137524.4A CN105743382A (en) | 2016-03-11 | 2016-03-11 | DC-AC conversion device and inverter based on same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610137524.4A CN105743382A (en) | 2016-03-11 | 2016-03-11 | DC-AC conversion device and inverter based on same |
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| Publication Number | Publication Date |
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| CN105743382A true CN105743382A (en) | 2016-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610137524.4A Pending CN105743382A (en) | 2016-03-11 | 2016-03-11 | DC-AC conversion device and inverter based on same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011343A (en) * | 2019-04-04 | 2019-07-12 | 华北科技学院 | Width input bidirectional power supply power supply device |
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| CN102157955A (en) * | 2011-02-28 | 2011-08-17 | 特变电工新疆新能源股份有限公司 | Single-phase non-isolation type photovoltaic grid-connected inverter and control method |
| CN202261073U (en) * | 2011-09-21 | 2012-05-30 | 江苏金帆电源科技有限公司 | Circuit structure of inverter |
| CN102185514B (en) * | 2011-03-10 | 2013-07-10 | 浙江大学 | Single-phase three-level inverter |
| EP2950438A1 (en) * | 2013-12-04 | 2015-12-02 | Sungrow Power Supply Co., Ltd. | Five level inverter |
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2016
- 2016-03-11 CN CN201610137524.4A patent/CN105743382A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102157955A (en) * | 2011-02-28 | 2011-08-17 | 特变电工新疆新能源股份有限公司 | Single-phase non-isolation type photovoltaic grid-connected inverter and control method |
| CN102185514B (en) * | 2011-03-10 | 2013-07-10 | 浙江大学 | Single-phase three-level inverter |
| CN202261073U (en) * | 2011-09-21 | 2012-05-30 | 江苏金帆电源科技有限公司 | Circuit structure of inverter |
| EP2950438A1 (en) * | 2013-12-04 | 2015-12-02 | Sungrow Power Supply Co., Ltd. | Five level inverter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011343A (en) * | 2019-04-04 | 2019-07-12 | 华北科技学院 | Width input bidirectional power supply power supply device |
| CN110011343B (en) * | 2019-04-04 | 2024-01-30 | 华北科技学院 | Wide-input bidirectional power supply device |
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