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CN106026728A - Photovoltaic micro inverter - Google Patents

Photovoltaic micro inverter Download PDF

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Publication number
CN106026728A
CN106026728A CN201610512662.6A CN201610512662A CN106026728A CN 106026728 A CN106026728 A CN 106026728A CN 201610512662 A CN201610512662 A CN 201610512662A CN 106026728 A CN106026728 A CN 106026728A
Authority
CN
China
Prior art keywords
diode
switching tube
converter
capacitance
resonant
Prior art date
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.)
Pending
Application number
CN201610512662.6A
Other languages
Chinese (zh)
Inventor
周哲
王光波
邓占锋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
North China Electric Power University
Global Energy Interconnection Research Institute
Original Assignee
State Grid Corp of China SGCC
North China Electric Power University
Global Energy Interconnection Research Institute
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, North China Electric Power University, Global Energy Interconnection Research Institute filed Critical State Grid Corp of China SGCC
Priority to CN201610512662.6A priority Critical patent/CN106026728A/en
Publication of CN106026728A publication Critical patent/CN106026728A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H02M7/4826—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 operating from a resonant DC source, i.e. the DC input voltage varies periodically, e.g. resonant DC-link inverters
    • 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
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost converters
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Inverter Devices (AREA)

Abstract

The invention provides a photovoltaic micro inverter. The inverter comprises a boost module and an inverter module. The boost module comprises a preceding-stage DC-DC converter and a backward-stage DC-DC converter. A photovoltaic array (PV), the preceding-stage DC-DC converter, the backward-stage DC-DC converter and the inverter module are sequentially connected in series. The preceding-stage DC-DC converter comprises an input capacitor C1, a Buck-Boost circuit and an output capacitor C2. The input capacitor C1 is connected in parallel with the Buck-Boost circuit. The Buck-Boost circuit is connected in parallel with the output capacitor C2. According to the technical scheme of the invention, the circuit characteristics of small switching loss is fully utilized, and the high frequency characteristics of a switched-capacitor circuit is given play to. Therefore, the volume and the output ripple wave of a filter are effectively reduced.

Description

A kind of photovoltaic miniature inverter
Technical field
The invention belongs to electric and electronic technical field, a kind of photovoltaic miniature inverter.
Background technology
In recent years, photovoltaic miniature inverter increasingly received publicity with its exclusive advantage.It is a kind of and single photovoltaic module Be connected, the unidirectional current that photovoltaic exports can be directly converted to meet the inverter of grid-connected conditions alternating current, power typically 50～ Between 300W.Photovoltaic miniature inverter can be effectively prevented the power attenuation that local shades causes, and drops by simplifying wiring Low installation cost, utilizes separate framework to improve the global reliability of system.
Photovoltaic DC-to-AC converter can be divided into single step arrangement and two-layer configuration.The inverter of single stage type refers to realize in a power link High-power some tracing control, the photovoltaic power changer of DC-AC inversion.It has simple in construction, inverter efficiency advantages of higher, But single stage type inverter to realize MPPT maximum power point tracking control and inversion grid connection a power link to be controlled, control object many and Intercouple, add the design difficulty of controller.Although the inverter structure power progression of two-stage type is many, overall efficiency is less than Single stage type inverter, but its MPPT maximum power point tracking that can realize photovoltaic panel individually controls with grid-connected inverters, it is to avoid inversion The device grid-connected work impact on photovoltaic device output, the most more economic worth.
The output voltage of the photovoltaic cell of the most a lot of specifications is generally about 30V, and micro-inverter is accomplished by the liter possessing high-gain Pressure function, improves DC voltage to 310V, just can complete inversion grid connection.Common Boost circuit is The high step-up ratio that can only provide 5 times, therefore cannot be applied individually to any Miniature inverter.And the topology that this patent is proposed possesses height The characteristic of gain, its power density is big simultaneously, and the Sofe Switch characteristic of resonant switch electric capacity is favorably improved efficiency, from boosting Angle is highly suitable to be applied in Miniature inverter.But its modulation range is narrow, it is impossible to realize MPPT maximum power point tracking.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the present invention provides a kind of photovoltaic miniature inverter, real by arranging boost module Show the MPPT maximum power point tracking of photovoltaic cell, voltage has been improved simultaneously and be easy to direct inversion grid connection；And by arranging inversion module Realizing phase-locked control and DC voltage control, inverse of the DC into AC is connected to the grid.
In order to realize foregoing invention purpose, the present invention adopts the following technical scheme that:
The present invention provides a kind of photovoltaic miniature inverter, and inverter includes boost module and inversion module；Boost module includes prime DC-DC converter and rear class DC-DC converter；Photovoltaic array (PV), preceding stage DC-DC changer, rear class DC-DC Changer and inversion module are sequentially connected in series.
Preceding stage DC-DC changer includes input capacitance C1, Buck-Boost circuit and output capacitance C2；
Input capacitance C1With Buck-Boost circuit in parallel, Buck-Boost circuit and output capacitance C2In parallel.
Buck-Boost circuit includes switching tube Q1, boost inductance L1With diode D1；Switching tube Q1Use N-channel MOSFET；
Input capacitance C1With switching tube Q1It is connected and the input of institute's junction connection preceding stage DC-DC changer, switching tube Q1With boost inductance L1With input capacitance C after series connection1Parallel connection, diode D1Negative electrode connecting valve pipe Q1Source electrode, two poles Pipe D1Anode and output capacitance C2Be connected rear and boost inductance L1In parallel.
Rear class DC-DC converter is resonant switch condenser network；Rear class DC-DC converter includes switching tube Q2, switching tube Q3, resonant capacitance C1a, resonant capacitance C1b, resonant capacitance C1c, electric capacity of voltage regulation C2a, electric capacity of voltage regulation C2b, electric capacity of voltage regulation C2c、 Resonant inductance Lr, diode D1a, diode D2a, diode D1b, diode D2b, diode D1cAnd diode D2c；
Switching tube Q2With switching tube Q3All use N-channel MOS FET.
Switching tube Q2With switching tube Q3Series connection forms Q2-Q3Branch road, Q2-Q3Branch road and the input of rear class DC-DC converter Connect, switching tube Q3Drain electrode connect rear class DC-DC converter input anode, its source electrode connecting valve pipe Q2Drain electrode, Switching tube Q2Source electrode connect rear class DC-DC converter input cathode；
Resonant inductance LrOne end connecting valve pipe Q2Drain, its one end is simultaneously connected with resonant capacitance C1a, resonant capacitance C1bWith Resonant capacitance C1c, diode D1aNegative electrode and switching tube Q2Source electrode connect, diode D1a, diode D2a, diode D1b, diode D2b, diode D1c, diode D2cIt is sequentially connected with, with electric capacity of voltage regulation C according to anode after first negative electrode2cSeries connection After again with Q2-Q3Branch circuit parallel connection；
Resonant capacitance C1aOne end and resonant inductance LrConnect, its other end and diode D1aAnode connects；Resonant capacitance C1b One end and resonant inductance LrConnect, its other end and diode D1bAnode connects；Resonant capacitance C1cOne end and resonant inductance Lr Connect, its other end and diode D1cAnode connects；
Electric capacity of voltage regulation C2aOne end and diode D2aAnode connects, its other end and switching tube Q3Drain electrode connect, electric capacity of voltage regulation C2bOne end and diode D2bAnode connects, its other end and pipe Q3Drain electrode connect.
Inversion module uses full bridge inverter.
Compared with immediate prior art, the beneficial effects of the present invention is:
1), under Buck-Boost circuit operates in the pattern of continuous current mode, switching tube is operated under zero current turning-on state, Switching loss reduces, and can change the height of voltage neatly, and the switching tube in resonant switch condenser network is operated in quasi-resonance State, switching loss reduces；
2) make full use of the electric circuit characteristic that switching loss is little, play the high frequency characteristics of switched-capacitor circuit, wave filter can be effectively reduced Volume and output ripple；
3) preceding stage DC-DC changer uses Buck-Boost circuit realiration MPPT maximum power point tracking and the lifting of voltage, rear class DC-DC Changer is responsible for further lifting voltage and is reached electrical network grade, achieves MPPT maximum power point tracking while step-up ratio is more than 10.
Accompanying drawing explanation
Fig. 1 is the structure chart of photovoltaic miniature inverter in the embodiment of the present invention；
Fig. 2 is preceding stage DC-DC converter topology structure chart in the embodiment of the present invention；
Fig. 3 is preceding stage DC-DC convertor controls signal and inductive current oscillogram in the embodiment of the present invention；
Fig. 4 is rear class DC-DC converter topology diagram in the embodiment of the present invention；
Fig. 5 is the working waveform figure of rear class DC-DC converter in the embodiment of the present invention；
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail.
The present invention provides a kind of photovoltaic miniature inverter, and such as Fig. 1, described inverter includes boost module and inversion module；Boosting Module achieves the MPPT maximum power point tracking of photovoltaic cell, is improved by voltage simultaneously and is easy to direct inversion grid connection；Inversion module realizes Phase-locked control and DC voltage control, inverse of the DC into AC is connected to the grid.
Boost module includes preceding stage DC-DC changer and rear class DC-DC converter；Photovoltaic array, preceding stage DC-DC convert Device, rear class DC-DC converter and inversion module are sequentially connected in series.
Such as Fig. 2, described preceding stage DC-DC changer includes input capacitance C1, Buck-Boost circuit and output capacitance C2；
Described input capacitance C1With Buck-Boost circuit in parallel, Buck-Boost circuit and output capacitance C2In parallel.
Described Buck-Boost circuit includes switching tube Q1, boost inductance L1With diode D1；Described switching tube Q1Use N Channel mosfet；
Described input capacitance C1With switching tube Q1It is connected and the input of institute's junction connection preceding stage DC-DC changer, described Switching tube Q1With boost inductance L1With input capacitance C after series connection1Parallel connection, described diode D1Negative electrode connecting valve pipe Q1's Source electrode, diode D1Anode and output capacitance C2Be connected rear and boost inductance L1In parallel.
Described Buck-Boost circuit, when switch controlled signal is timing, switching tube Q1In the conduction state, concatenated Inductive current is gradually increased；When switching tube signal is zero, switching tube Q1Being off state, the inductive current concatenated is with more Big speed reduces.The waveform of control signal and inductive current is as shown in Figure 3.It can be seen that Buck-Boost circuital current is Continuous print.Additionally, switching tube Q1It is zero current turning-on, reduces switching loss.
Described rear class DC-DC converter is resonant switch condenser network；
Such as Fig. 4, described rear class DC-DC converter includes switching tube Q2, switching tube Q3, resonant capacitance C1a, resonant capacitance C1b, resonant capacitance C1c, electric capacity of voltage regulation C2a, electric capacity of voltage regulation C2b, electric capacity of voltage regulation C2c, resonant inductance Lr, diode D1a、 Diode D2a, diode D1b, diode D2b, diode D1cAnd diode D2c；
Described switching tube Q2With switching tube Q3All use N-channel MOS FET.
Photovoltaic miniature inverter according to claim 4, it is characterised in that: described switching tube Q2With switching tube Q3Series connection Form Q2-Q3Branch road, described Q2-Q3Branch road connects with the input of rear class DC-DC converter, described switching tube Q3Leakage Pole connects the input anode of rear class DC-DC converter, its source electrode connecting valve pipe Q2Drain electrode, described switching tube Q2Source Pole connects the input cathode of rear class DC-DC converter；
Described resonant inductance LrOne end connecting valve pipe Q2Drain, its one end is simultaneously connected with resonant capacitance C1a, resonant capacitance C1bWith resonant capacitance C1c, described diode D1aNegative electrode and switching tube Q2Source electrode connect, described diode D1a, two poles Pipe D2a, diode D1b, diode D2b, diode D1c, diode D2cIt is sequentially connected with according to anode after first negative electrode, and surely Voltage capacitance C2cAfter series connection again with Q2-Q3Branch circuit parallel connection；
Described resonant capacitance C1aOne end and resonant inductance LrConnect, its other end and diode D1aAnode connects；Described resonance Electric capacity C1bOne end and resonant inductance LrConnect, its other end and diode D1bAnode connects；Described resonant capacitance C1cOne end with Resonant inductance LrConnect, its other end and diode D1cAnode connects；
Described electric capacity of voltage regulation C2aOne end and diode D2aAnode connects, its other end and switching tube Q3Drain electrode connect, described Electric capacity of voltage regulation C2bOne end and diode D2bAnode connects, its other end and pipe Q3Drain electrode connect.
It can make input voltage improve 4 times in theory.Meanwhile, this rear class DC-DC converter is by adding a resonant inductance Lr, under specific switching frequency, utilize quasi-resonance soft switch effectively to inhibit switching loss.At switching tube Q2Or Q3Arbitrarily One when opening, due to the effect of resonant ring, switching tube achieves the mechanism of zero current turning-on.Maximum peak is reached at resonance current It is gradually decrease to zero after value, forms reverse current owing to the action current of diode will not continue to drop to negative value, electric current when making shutoff It is zero it is achieved thereby that Sofe Switch, improves whole efficiency.
The switching device control signal of resonant switch capacitive transducer, flows through switching tube Q2、Q3With resonant inductance LrIdeal Current waveform is as shown in Figure 5.At switching tube Q3Service time t0Time, switching tube Q3Conducting, due to resonance, inductance just flows through The electric current of string form.At current cut-off time t1Time, electric current forward becomes 0, and due to the effect of diode, electric current no longer changes. On-off switching tube Q subsequently3, at upper pipe service time t2, switching tube Q2Conducting, inductance flows through the electric current of reverse sinusoidal form, At electric current t reverse deadline3Time, inductive current becomes 0, and due to the effect of diode, electric current no longer changes.Switch subsequently Pipe Q2Closing, when down tube turns on again, the time is t4, repeat above work process.The electric current of inductance is at t0-t1Stage forward Sinusoidal variations, t1-t2Become 0, t2-t3Reversely sinusoidal variations, t3-t4Become 0.
Each working cycle of resonant switch capacitive transducer can be divided into 4 mode, specific as follows:
First mode (t0-t1):
t0Moment, Q3Conducting, Q2Turn off.ViWith D1a、C1aAnd LrConstitute loop, t0Moment starts to produce series resonance, electricity Stream is started from scratch and is gradually increasing, and changes sinusoidally, when current value reaches zero again, due to D1aObstruction, electricity Stream can not be reverse, is hereafter maintained zero.Additionally, C2a、D1b、C1b、LrAnd Q3And C2b、D1c、C1c、LrAnd Q3Also All produce identical resonance phenomena.Therefore, at toMoment, Q3Realize zero current turning-on.Voltage pump rise aspect, ViTo C1aFill Electricity, C2aTo C1bCharge to 2Vi, C2bTo C1cCharge to 3Vi, C2cPowering load.
Second mode (t1-t2):
Resonance is at t1Moment stops, and inductive current perseverance during this mode is zero, and two switching tubes are all in off state.Electric capacity C2cPowering load.
3rd mode (t2-t3):
t1Moment, Q2Conducting, Q3Turn off.ViWith D2a、C1a、C2aAnd LrConstitute loop, t2It is humorous that moment starts to produce series connection Shaking, electric current is started from scratch and is gradually increasing, and changes sinusoidally, when current value is zero again, due to D2aObstruction, Electric current can not be reverse, is hereafter maintained zero.Additionally, Vi、C1b、D2b、C2b、Lr、Q3Similar loop in series.Vi Also by Q1、Lr、C1c、D2cBe cascaded generation resonance, powers to the load.Therefore, t2Moment Q3Achieve zero current Open-minded.Voltage pump rise aspect, ViRespectively with C1a、C1b、C1cIt is cascaded, by C2a、C2b、C2cCharge to 2Vi、3Vi、 4Vi。
4th mode (t3-t4):
Resonance is at t3Moment stops, and inductive current perseverance during this mode is zero, and two switching tubes are all in off state.Only electricity Hold C2cPowering load again.
Sofe Switch in can the realizing from zero load to full-load range of this resonant switch capacitive transducer, but its relevant parameter The normal work of selection following two to be met condition guarantee converter soft switch.First, switching frequency should be less than resonance Frequency, switch motion should be carried out after sinusoidal variations is zero at resonance current；Second, the voltage ripple of resonant capacitance be should give Limit.
Described inversion module uses full bridge inverter.Full bridge inverter includes four switching devices, and two groups are chained together Two switching tubes, are defined as first group and second group.First group of two switching tube centre position connects one end of exchange outlet side, the Two groups of two switching tube centre positions connect the other end of exchange outlet side.First group of switching tube and second group of switching tube are in parallel, with Direct current input connects.
Finally should be noted that: above example only in order to illustrate that technical scheme is not intended to limit, art Those of ordinary skill still the detailed description of the invention of the present invention can be modified or equivalent with reference to above-described embodiment, These are without departing from any amendment of spirit and scope of the invention or equivalent, the claim of the present invention all awaited the reply in application Within protection domain.

Claims (5)

1. a photovoltaic miniature inverter, including boost module and inversion module；It is characterized in that: before described boost module includes Level DC-DC converter and rear class DC-DC converter；
Photovoltaic array, described preceding stage DC-DC changer, described rear class DC-DC converter and described inversion module are sequentially connected in series；
Described preceding stage DC-DC changer includes: input capacitance C1, Buck-Boost circuit and output capacitance C2；
Described input capacitance C1With Buck-Boost circuit in parallel, Buck-Boost circuit and output capacitance C2In parallel.
Photovoltaic miniature inverter the most according to claim 1, it is characterised in that: described Buck-Boost circuit includes out Close pipe Q1, boost inductance L1With diode D1；
Described input capacitance C1With described switching tube Q1It is connected, and junction connects the input of preceding stage DC-DC changer, institute State switching tube Q1With described boost inductance L1With described input capacitance C after series connection1Parallel connection, described diode D1Negative electrode connect Described switching tube Q1Source electrode, described diode D1Anode and described output capacitance C2With described boost inductance L after being connected1 In parallel；
Described switching tube Q1Use N-channel MOS FET.
Photovoltaic miniature inverter the most according to claim 1, it is characterised in that: described rear class DC-DC converter is humorous Formula of shaking switched-capacitor circuit；
Described rear class DC-DC converter includes switching tube Q2, switching tube Q3, resonant capacitance C1a, resonant capacitance C1b, resonance Electric capacity C1c, electric capacity of voltage regulation C2a, electric capacity of voltage regulation C2b, electric capacity of voltage regulation C2c, resonant inductance Lr, diode D1a, diode D2a、 Diode D1b, diode D2b, diode D1cAnd diode D2c；
Described switching tube Q2With described switching tube Q3Use N-channel MOS FET.
Photovoltaic miniature inverter the most according to claim 3, it is characterised in that: described switching tube Q2With described switching tube Q3Series connection forms Q2-Q3Branch road, described Q2-Q3Branch road connects with the input of described rear class DC-DC converter, described switch Pipe Q3Drain electrode connect described rear class DC-DC converter input anode, its source electrode connect described switching tube Q2Drain electrode, Described switching tube Q2Source electrode connect described rear class DC-DC converter input cathode；
Described resonant inductance LrOne end connects described switching tube Q2Drain, its one end is simultaneously connected with described resonant capacitance C1a, institute State resonant capacitance C1bWith described resonant capacitance C1c, described diode D1aNegative electrode and described switching tube Q2Source electrode connect, institute State diode D1a, described diode D2a, described diode D1b, described diode D2b, described diode D1c, described two Pole pipe D2cIt is sequentially connected with, with described electric capacity of voltage regulation C according to anode after first negative electrode2cWith described Q after series connection2-Q3Branch circuit parallel connection；
Described resonant capacitance C1aOne end and described resonant inductance LrConnect, its other end and described diode D1aAnode connects； Described resonant capacitance C1bOne end and described resonant inductance LrConnect, its other end and described diode D1bAnode connects；Described Resonant capacitance C1cOne end and described resonant inductance LrConnect, its other end and described diode D1cAnode connects；
Described electric capacity of voltage regulation C2aOne end and described diode D2aAnode connects, its other end and described switching tube Q3Drain electrode even Connect, described electric capacity of voltage regulation C2bOne end and described diode D2bAnode connects, its other end and described switching tube Q3Drain electrode even Connect.
Photovoltaic miniature inverter the most according to claim 1, it is characterised in that: described inversion module uses full-bridge inverting electricity Road.
CN201610512662.6A 2016-06-30 2016-06-30 Photovoltaic micro inverter Pending CN106026728A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106452077A (en) * 2016-11-21 2017-02-22 天津大学 High-boosting direct-current converter with switch inductance-capacitance
CN106787736A (en) * 2017-03-08 2017-05-31 广东工业大学 A kind of biswitch high step-up ratio PWM DC converters
CN107947617A (en) * 2017-10-23 2018-04-20 胡炎申 A kind of hybrid switch single-phase inverter
CN109842312A (en) * 2019-02-28 2019-06-04 全球能源互联网研究院有限公司 Inverter and its control method
US20220104387A1 (en) * 2020-09-29 2022-03-31 Baidu Usa Llc Thermal management system for electronic components with thermoelectric element

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