CN106787798A - Intelligent sine voltage change-over circuit based on PFC interleaving inverse excitation full-bridges - Google Patents

Intelligent sine voltage change-over circuit based on PFC interleaving inverse excitation full-bridges Download PDF

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Publication number
CN106787798A
CN106787798A CN201611225468.6A CN201611225468A CN106787798A CN 106787798 A CN106787798 A CN 106787798A CN 201611225468 A CN201611225468 A CN 201611225468A CN 106787798 A CN106787798 A CN 106787798A
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CN
China
Prior art keywords
connected
switching tube
unit
switch pipe
end
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CN201611225468.6A
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Chinese (zh)
Inventor
廖志刚
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广东百事泰电子商务股份有限公司
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Priority to CN201611225468.6A priority Critical patent/CN106787798A/en
Publication of CN106787798A publication Critical patent/CN106787798A/en

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/14Arrangements for reducing ripples from dc input or output
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/42Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208Arrangements for improving power factor of AC input
    • H02M1/4225Arrangements for improving power factor of AC input using a non-isolated boost converter
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current
    • H02M3/33523Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current with galvanic isolation between input and output
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M5/00Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion 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
    • H02M7/53Conversion 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
    • H02M7/537Conversion 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
    • H02M7/5387Conversion 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
    • 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
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion
    • Y02B70/12Power factor correction technologies for power supplies
    • Y02B70/126Active technologies

Abstract

The invention discloses a kind of intelligent sine voltage change-over circuit based on PFC interleaving inverse excitation full-bridges, it includes input block, PFC boost unit, and:Interleaving inverse excitation isolated variable unit, includes first switch pipe, second switch pipe, the first transformer, the second transformer, the second commutation diode and the 3rd commutation diode;DC filter units, include a CBB filter capacitors, the 2nd CBB filter capacitors and filter inductance, the front end of the filter inductance is connected to the front end of a CBB filter capacitors, the rear end of the filter inductance is connected to the front end of the 2nd CBB filter capacitors, the rear end of the first CBB filter capacitors and the rear end of the 2nd CBB filter capacitors are all connected to rear end ground, the front end of the filter inductance is connected to the output end of interleaving inverse excitation isolated variable unit, the rear end of the filter inductance as DC filter units output end;Inversion reversed phase unit.The present invention can reduce ripple interference and improve output voltage quality.

Description

Intelligent sine voltage change-over circuit based on PFC interleaving inverse excitation full-bridges

Technical field

The present invention relates to voltage conversion circuit, more particularly to a kind of intelligent sine wave based on PFC interleaving inverse excitation full-bridges Voltage conversion circuit.

Background technology

In the prior art, the intelligent boost-buck conversion equipment for turning AC by AC is otherwise known as travelling insert row, in the device, voltage Change-over circuit is its Key Circuit, is a kind of circuit that can realize AC-AC conversion, can realize buck in AC-AC conversion And the function of burning voltage and frequency.But current AC-AC just most of meaningful formula equipment Market be non-isolation type topology electricity Road, and PF values are low, output voltage quality is low, security reliability is poor.Particularly during voltage conversion, more line can be produced Wave interference, is especially the absence of EMI filtering performances, therefore influence quality of voltage.

The content of the invention

The technical problem to be solved in the present invention is, in view of the shortcomings of the prior art, there is provided a kind of to reduce circuit Ripple, good wave filtering effect, output voltage quality can be improved, and it is safe and reliable based on the intelligent of PFC interleaving inverse excitation full-bridges Sine voltage change-over circuit.

In order to solve the above technical problems, the present invention is adopted the following technical scheme that.

A kind of intelligent sine voltage change-over circuit based on PFC interleaving inverse excitation full-bridges, it includes straight for providing Input block, the PFC boost unit for carrying out boost conversion to the DC voltage of voltage are flowed, and:One interleaving inverse excitation Isolated variable unit, includes first switch pipe, second switch pipe, the first transformer, the second transformer, the second commutation diode With the 3rd commutation diode, the first end of the first end of the first primary winding and the second primary winding is equal The output end of PFC boost unit is connected to, the second end of the first primary winding is connected to the leakage of first switch pipe Pole, the second end of the second primary winding is connected to the drain electrode of second switch pipe, the source electrode of the first switch pipe Front end ground is all connected to the source electrode of second switch pipe, the grid of the first switch pipe and the grid of second switch pipe are used to connect Enter the pwm pulse signal of two-way opposite in phase, the first end of the first transformer secondary output winding is connected to the pole of the second rectification two The anode of pipe, the first end of the second transformer secondary output winding is connected to the anode of the 3rd commutation diode, and described first becomes Second end of the second end of depressor secondary windings and the second transformer secondary output winding is all connected to rear end ground, second rectification two The negative electrode of the negative electrode of pole pipe and the 3rd commutation diode be connected after as interleaving inverse excitation isolated variable unit output end;One DC Filter unit, includes a CBB filter capacitors, the 2nd CBB filter capacitors and filter inductance, and the front end of the filter inductance connects The front end of a CBB filter capacitors is connected to, the rear end of the filter inductance is connected to the front end of the 2nd CBB filter capacitors, described The rear end of the first CBB filter capacitors and the rear end of the 2nd CBB filter capacitors are all connected to rear end ground, the front end of the filter inductance Be connected to the output end of interleaving inverse excitation isolated variable unit, the rear end of the filter inductance as DC filter units output end; One inversion reversed phase unit, is connected to the output end of DC filter units, and the inversion reversed phase unit is used for the defeated of DC filter units Alternating current is exported after going out voltage and carrying out inversion conversion.

Preferably, the input block includes socket, insurance, lightning protection resistance, common mode inhibition inductance, safety electric capacity and whole Stream bridge, the insurance is serially connected with the zero line of socket or live wire, and the front end of the common mode inhibition inductance is parallel to socket, described anti- Thunder and lightning resistance is parallel to the front end of common mode inhibition inductance, and the input of the safety electric capacity and rectifier bridge is parallel to common mode inhibition electricity The rear end of sense, the output end of the rectifier bridge is parallel with filter capacitor.

Preferably, the PFC boost unit includes boost inductance, the 3rd switching tube, the first commutation diode and second Electrochemical capacitor, the front end of the boost inductance is connected to the output end of input block, and the rear end of the boost inductance is connected to The drain electrode of three switching tubes, the source electrode of the 3rd switching tube connects front end ground, and the grid of the 3rd switching tube is used to access all the way Pwm control signal, the anode of drain electrode first commutation diode of connection of the 3rd switching tube, first commutation diode Negative electrode as PFC boost unit output end, and the negative electrode of first commutation diode connects the positive pole of the second electrochemical capacitor, the The negative pole of two electrochemical capacitors connects front end ground.

Preferably, also include a MCU control unit, the grid of the first switch pipe, the grid of second switch pipe and The grid of the 3rd switching tube is connected to MCU control unit, and the MCU control unit is used to distinguishing output pwm signal to the One switching tube, second switch pipe and the 3rd switching tube, to control first switch pipe, second switch pipe and the 3rd switching tube break-make shape State.

Preferably, the MCU control unit includes single-chip microcomputer and its peripheral circuit.

Preferably, an AC sampling unit is also included, the AC sampling unit is connected to the input of input block Between MCU control unit, the AC sampling unit is used to gather the voltage of input block AC and feed back to MCU controls Unit.

Preferably, the AC sampling unit includes amplifier, and two inputs of the amplifier are respectively by current limliting electricity Hinder and be connected to the input of input block, the output end of the amplifier is connected to MCU control unit.

Preferably, the first sampling resistor is connected between the source electrode and front end ground of the 3rd switching tube, the described 3rd opens The source electrode for closing pipe is connected to MCU control unit, makes MCU control unit gather the 3rd switching tube by first sampling resistor The electric signal of source electrode.

Preferably, a D/C voltage sampling unit is also included, the D/C voltage sampling unit includes for being sequentially connected in series Two sampling resistors and the 3rd sampling resistor, the front end of second sampling resistor are connected to the output end of DC filter units, described The rear end of the 3rd sampling resistor is connected to MCU control unit, and MCU is made by second sampling resistor and the 3rd sampling resistor The electric signal of control unit collection DC filter unit outputs.

Preferably, the inversion reversed phase unit includes being opened by the 4th switching tube, the 5th switching tube, the 6th switching tube and the 7th Close the inverter bridge of pipe composition, grid, the grid of the 5th switching tube, the grid and the 7th of the 6th switching tube of the 4th switching tube The grid of switching tube is connected to MCU control unit, controls the 4th switching tube, the 5th to open by the MCU control unit Guan Guan, the 6th switching tube and the 7th switching tube on or off, to make the inversion reversed phase unit output AC voltage.

In intelligent sine voltage change-over circuit based on PFC interleaving inverse excitation full-bridges disclosed by the invention, input block For providing DC voltage, boosting treatment is carried out to the DC voltage that input block is exported using PFC boost unit, exported afterwards To interleaving inverse excitation isolated variable unit, in the interleaving inverse excitation isolated variable unit, first switch pipe and the interaction of second switch pipe are led It is logical, the second switch pipe cut-off when first switch pipe is turned on, electric current is by the first primary winding, first switch pipe to front end Ground forms loop, and the first primary winding starts reserves;When second switch pipe is turned on, the cut-off of first switch pipe, electric current By the second primary winding, second switch pipe, loop is constituted to front end, the second primary winding starts energy storage, together When the first primary winding electric energy secondary windings is bonded to by its magnetic core lotus root, then supplied to load through the second commutation diode Electricity;Then first switch pipe is turned on again, and second switch pipe cut-off, the first transformer energy storage, the second transformer secondary output winding leads to The 3rd commutation diode is crossed to power to the load.In above-mentioned interleaving inverse excitation isolated variable unit, due to being to interact conducting electric current ripple It is smaller, using relatively flexibly, particularly need to only start flyback when loading smaller and become circuit, on this basis, DC Filter unit employs the pi type filter being made up of a CBB filter capacitors, the 2nd CBB filter capacitors and filter inductance so that EMI, EMC in circuit disturb smaller, circuit work frequency higher, and can improve power density, in practical application, by changing Becoming the first transformer, the turn ratio of the second transformer primary and secondary can change output voltage, be capable of achieving boosting or be depressured.

Brief description of the drawings

Fig. 1 is the circuit theory diagrams of sine voltage change-over circuit.

Fig. 2 is the circuit theory diagrams of AC sampling unit in the preferred embodiment of the present invention.

Fig. 3 is the circuit theory diagrams of MCU control unit in the preferred embodiment of the present invention.

Specific embodiment

The present invention is described in more detail with reference to the accompanying drawings and examples.

The invention discloses a kind of intelligent sine voltage change-over circuit based on PFC interleaving inverse excitation full-bridges, with reference to Fig. 1 Shown in Fig. 3, its include for DC voltage is provided input block 10, for carrying out boost conversion to the DC voltage PFC boost unit 20, and:

One interleaving inverse excitation isolated variable unit 30, includes first switch pipe Q6, second switch pipe Q7, the first transformer T1, the second transformer T2, the second commutation diode D7 and the 3rd commutation diode D8, the first transformer T1 armature windings The first end of first end and the second transformer T2 armature windings is all connected to the output end of PFC boost unit 20, and described first becomes Second end of depressor T1 armature windings is connected to the drain electrode of first switch pipe Q6, the second of the second transformer T2 armature windings End is connected to the drain electrode of second switch pipe Q7, and the source electrode of the first switch pipe Q6 and the source electrode of second switch pipe Q7 are all connected to Front end ground, the grid of the first switch pipe Q6 and the grid of second switch pipe Q7 are used to access the PWM arteries and veins of two-way opposite in phase Signal is rushed, the first end of the first transformer T1 secondary windings is connected to the anode of the second commutation diode D7, described second The first end of transformer T2 secondary windings is connected to the anode of the 3rd commutation diode D8, the first transformer T1 secondary windings The second end and the second transformer T2 secondary windings the second end be all connected to rear end ground, the moon of the second commutation diode D7 Pole be connected with the negative electrode of the 3rd commutation diode D8 after as interleaving inverse excitation isolated variable unit 30 output end;

One DC filter units 40, include a CBB filter capacitors C3, the 2nd CBB filter capacitors C4 and filter inductance L3, The front end of the filter inductance L3 is connected to the front end of a CBB filter capacitors C3, and the rear end of the filter inductance L3 is connected to The front end of the 2nd CBB filter capacitors C4, the rear end of the CBB filter capacitors C3 and the rear end of the 2nd CBB filter capacitors C4 Rear end ground is all connected to, the front end of the filter inductance L3 is connected to the output end of interleaving inverse excitation isolated variable unit 30, described The rear end of filter inductance L3 as DC filter units 40 output end;

One inversion reversed phase unit 60, is connected to the output end of DC filter units 40, and it is right that the inversion reversed phase unit 60 is used for The output voltage of DC filter units 40 exports alternating current after carrying out inversion conversion.

In above-mentioned sine voltage change-over circuit, input block 10 is used to provide DC voltage, using PFC boost unit 20 DC voltage to the output of input block 10 carries out boosting treatment, exports afterwards to interleaving inverse excitation isolated variable unit 30, the friendship In wrong flyback isolated variable unit 30, first switch pipe Q6 and second switch pipe Q7 interaction conductings, when first switch pipe Q6 conductings When second switch pipe Q7 cut-off, electric current by the first transformer T1 armature windings, form loop first switch pipe Q6 to front end, the One transformer T1 armature windings start reserves;When second switch pipe Q7 is turned on, first switch pipe Q6 cut-offs, electric current is become by second Depressor T2 armature windings, second switch pipe Q7, front end ground constitute loop, and the second transformer T2 armature windings start energy storage, while The electric energy of the first transformer T1 armature windings is bonded to secondary windings by its magnetic core lotus root, then through the second commutation diode D7 to load Power supply;Then first switch pipe Q6 is turned on again, second switch pipe Q7 cut-offs, the first transformer T1 energy storage, the second transformer T2 Secondary windings is powered to the load by the 3rd commutation diode D8.In above-mentioned interleaving inverse excitation isolated variable unit 30, due to being to hand over Mutual conducting electric current ripple is smaller, using relatively flexibly, particularly need to only start a flyback when loading smaller and become circuit, On this basis, DC filter units 40 are employed by a CBB filter capacitors C3, the 2nd CBB filter capacitors C4 and filter inductance The pi type filter that L3 is constituted so that EMI, EMC in circuit disturb smaller, circuit work frequency higher, and can improve power Density, in practical application, output electricity can be changed by the turn ratio of the first transformer T1 of change, the second transformer T2 primary and secondaries Pressure, is capable of achieving boosting or is depressured.Because first switch pipe Q6 and second switch pipe Q7 are that the high-frequency PWM modulated by sinusoidal rule is believed Number, the pi type filter constituted via a CBB filter capacitors C3, the 3rd CBB filter capacitors C4 and filter inductance L3 filters high frequency After pulse signal, what is obtained in the 3rd CBB filter capacitors C4 is pure sinusoid half-wave voltage.

In DC filter units 40, because first switch pipe Q6 and second switch pipe Q7 are to modulate high frequency by sinusoidal power frequency Pwm signal work, after the second commutation diode D7, the 3rd commutation diode D8 rectifications, a CBB filter capacitors C3, filter Ripple inductance L3, the 3rd CBB filter capacitors C4 leave pure sinusoid half-wave voltage after filtering high frequency ripple, give voltage sample and inversion Unit.First switch pipe Q6 and second switch pipe Q7 in the present embodiment are to modulate high-frequency PWM signal with power frequency, can make the One switching tube Q6 and second switch pipe Q7 adjusts output voltage according to sinusoidal change.

Line voltage is converted to DC voltage so that subsequent conditioning circuit is used, specifically by the present embodiment in importation Refer to, the input block 10 include socket, insurance F2, lightning protection resistance RV1, common mode inhibition inductance L1, safety electric capacity CX1 and Rectifier bridge DB1, the insurance F2 are serially connected with the zero line of socket or live wire, and the front end of the common mode inhibition inductance L1 is parallel to slotting Seat, the lightning protection resistance RV1 is parallel to the front end of common mode inhibition inductance L1, the input of the safety electric capacity CX1 and rectifier bridge DB1 End is parallel to the rear end of common mode inhibition inductance L1, and the output end of the rectifier bridge DB1 is parallel with filter capacitor C1.

On boosting part, the PFC boost unit 20 includes boost inductance L2, the 3rd switching tube Q5, the first rectification The front end of diode D1 and the second electrochemical capacitor C2, the boost inductance L2 is connected to the output end of input block 10, the liter The rear end of voltage inductance L2 is connected to the drain electrode of the 3rd switching tube Q5, and the source electrode of the 3rd switching tube Q5 connects front end ground, and described the The grid of three switching tube Q5 is used to access pwm control signal all the way, and the drain electrode of the 3rd switching tube Q5 connects the first rectification two The anode of pole pipe D1, the negative electrode of the first commutation diode D1 as PFC boost unit 20 output end, and first rectification The negative electrode of diode D1 connects the positive pole of the second electrochemical capacitor C2, and the negative pole of the second electrochemical capacitor C2 connects front end ground.

Above-mentioned PFC boost unit 20, when filter capacitor C1 output half-wave alternating voltages are sampled, PFC enters liter pressing mold Formula, the PF values that AC is intelligently depressured conversion topologies circuit are turned to improve AC, and the second filtered electricity of electrochemical capacitor C2 is passed through after boosting It is 400V to press, and specific boosting principle is as follows:When 3rd switching tube Q5 is turned on, the boosted inductance of electric current on filter capacitor C1 L2, the 3rd switching tube Q5 to GND form loop, boost inductance L2 storage energy;When the 3rd switching tube Q5 is turned off, boost inductance On can form the induced electromotive force more much higher than input voltage, induced electromotive force carry out rectification through the first commutation diode D1 after shape The second electrochemical capacitor C2 electric capacity is given again into unidirectional pulse voltage and enters filtering, be filtered into the DC voltage of 400V.And the 3rd opens When pass pipe Q5 is that the input AC sine wave adopted according to control chip changes to increase or reduce the conducting of the 3rd switching tube Q5 Between, so that electric current is with voltage-phase change consistent to improve PF values.

Used as a kind of preferred embodiment, the present embodiment also includes a MCU control unit 80, the grid of the first switch pipe Q6 The grid of pole, the grid of second switch pipe Q7 and the 3rd switching tube Q5 is connected to MCU control unit 80, the MCU controls Unit 80 is used to distinguish output pwm signal to first switch pipe Q6, second switch pipe Q7 and the 3rd switching tube Q5, to control first Switching tube Q6, second switch pipe Q7 and the 3rd switching tube Q5 on off operating modes.Further, the MCU control unit 80 is included Single-chip microcomputer U1 and its peripheral circuit.

For the ease of monitoring the electric signal of AC, an AC sampling unit 70, the AC sampling unit are also included 70 are connected between the input of input block 10 and MCU control unit 80, and the AC sampling unit 70 is used to gather input The voltage of the AC of unit 10 simultaneously feeds back to MCU control unit 80.

Further, the AC sampling unit 70 includes two inputs difference of amplifier U9B, the amplifier U9B The input of input block 10 is connected to by current-limiting resistance, the output end of the amplifier U9B is connected to MCU control unit 80。

For the ease of carrying out Real-time Collection to electric current, is connected between the source electrode and front end ground of the 3rd switching tube Q5 One sampling resistor R2A, the source electrode of the 3rd switching tube Q5 is connected to MCU control unit 80, by first sampling resistor R2A and make MCU control unit 80 gather the 3rd switching tube Q5 source electrodes electric signal.

Used as a kind of preferred embodiment, in order to be acquired to DC side electric signal, the present embodiment also includes a D/C voltage Sampling unit 50, the D/C voltage sampling unit 50 includes the second sampling resistor R13 and the 3rd sampling resistor being sequentially connected in series The front end of R15, the second sampling resistor R13 is connected to the output end of DC filter units 40, the 3rd sampling resistor R15's Rear end is connected to MCU control unit 80, makes MCU control by the second sampling resistor R13 and the 3rd sampling resistor R15 single Unit 80 gathers the electric signal of the output of DC filter units 40.

On Converting Unit, the inversion reversed phase unit 60 includes being opened by the 4th switching tube Q1, the 5th switching tube Q2, the 6th Close the inverter bridge of pipe Q3 and the 7th switching tube Q4 compositions, the grid of the 4th switching tube Q1, the grid of the 5th switching tube Q2, the The grid of six switching tube Q3 and the grid of the 7th switching tube Q4 are connected to MCU control unit 80, are controlled by the MCU single Unit 80 and control the 4th switching tube Q1, the 5th switching tube Q2, the 6th switching tube Q3 and the 7th switching tube Q4 on or off, to make The output AC voltage of inversion reversed phase unit 60.

In above-mentioned inversion reversed phase unit 60, after filtering after DC voltage through the 4th switching tube Q1, load, the 7th switch Pipe Q4 forms loop powering load and forms first half period power frequency level;Second half period power frequency level is opened by the 5th Pipe Q2, load, the 6th switching tube Q3 formation loop are closed, a complete power frequency amendment ripple exchange is so formed in load Voltage.The pwm signal that single-chip microcomputer U1 is exported is sent out PWM1H, PWM1L, PWM2H, PWM2L and is opened to the 4th respectively after drive circuit Close pipe Q1, the 5th switching tube Q2, the 6th switching tube Q3, the GATE poles of the 7th switching tube Q4.Phase in inversion phase inverter with Frequency is operated according to the pattern of control chip inner setting.

As a kind of preferred embodiment, the interleaving inverse excitation isolated variable unit 30 also include the first sustained diode 6, First resistor R26 and the first electric capacity C5, the anode of first sustained diode 6 is connected to the drain electrode of first switch pipe Q6, institute The negative electrode for stating the first sustained diode 6 is connected to the output end of PFC boost unit 20, first electricity by first resistor R26 Hold C5 and be parallel to first resistor R26.Additionally, the interleaving inverse excitation isolated variable unit 30 also includes the second fly-wheel diode D5, second resistance R27 and the second electric capacity C6, the anode of second sustained diode 5 are connected to the leakage of second switch pipe Q7 Pole, the negative electrode of second sustained diode 5 is connected to the output end of PFC boost unit 20 by second resistance R27, described Second electric capacity C6 is parallel to second resistance R27.

In foregoing circuit, the second sustained diode 5, the first sustained diode 6, first resistor R26, second resistance R27, First electric capacity C5, the second electric capacity C6 are respectively first switch pipe Q6, the attraction circuit of second switch pipe Q7, for absorbing the first change The peak voltage that depressor T1, the leakage inductance of the second transformer T1 are produced, to subtract the voltage stress of switching tube.

Intelligent sine voltage change-over circuit based on PFC interleaving inverse excitation full-bridges disclosed by the invention, it compares existing For technology, the present invention has PF values high, realizes isolating for power network and output end, and its security is very high;Meanwhile, DC and DC Unit uses interworking mode so that EMC, EMI in circuit disturb small, power application flexible;Again, the present invention is in input Output voltage, and fixed output frequency can be automatically adjusted in full voltage range, and output voltage is with pure sine wave Output, automatic shaping function is pressed with to alternating current;Additionally, the present invention contains voltage and current sampling circuit, can anti-surge voltage With electric current.

The above is preferred embodiments of the present invention, is not intended to limit the invention, all in technology model of the invention Interior done modification, equivalent or improvement etc. are enclosed, be should be included in the range of of the invention protection.

Claims (10)

1. a kind of intelligent sine voltage change-over circuit based on PFC interleaving inverse excitation full-bridges, it is characterised in that include for Input block (10), the PFC boost unit (20) for carrying out boost conversion to the DC voltage of DC voltage are provided, with And:
One interleaving inverse excitation isolated variable unit (30), includes first switch pipe (Q6), second switch pipe (Q7), the first transformer (T1), the second transformer (T2), the second commutation diode (D7) and the 3rd commutation diode (D8), first transformer (T1) The first end of the first end of armature winding and the second transformer (T2) armature winding is all connected to the output of PFC boost unit (20) End, the second end of the first transformer (T1) armature winding is connected to the drain electrode of first switch pipe (Q6), second transformation Second end of device (T2) armature winding is connected to the drain electrode of second switch pipe (Q7), the source electrode of the first switch pipe (Q6) and The source electrode of two switching tubes (Q7) is all connected to front end ground, the grid of the first switch pipe (Q6) and the grid of second switch pipe (Q7) Pole is used to access the pwm pulse signal of two-way opposite in phase, and the first end of the first transformer (T1) secondary windings is connected to The anode of the second commutation diode (D7), the first end of the second transformer (T2) secondary windings is connected to the pole of the 3rd rectification two Manage the anode of (D8), the second end of the first transformer (T1) secondary windings and the second of the second transformer (T2) secondary windings End is all connected to rear end ground, and the negative electrode of second commutation diode (D7) and the negative electrode of the 3rd commutation diode (D8) are connected Afterwards as the output end of interleaving inverse excitation isolated variable unit (30);
One DC filter units (40), include a CBB filter capacitors (C3), the 2nd CBB filter capacitors (C4) and filter inductance (L3), the front end of the filter inductance (L3) is connected to the front end of a CBB filter capacitors (C3), the filter inductance (L3) Rear end is connected to the front end of the 2nd CBB filter capacitors (C4), and the rear end of a CBB filter capacitors (C3) and the 2nd CBB are filtered The rear end of ripple electric capacity (C4) is all connected to rear end ground, and the front end of the filter inductance (L3) is connected to interleaving inverse excitation isolated variable list The output end of first (30), the rear end of the filter inductance (L3) as DC filter units (40) output end;
One inversion reversed phase unit (60), is connected to the output end of DC filter units (40), and the inversion reversed phase unit (60) is used for Alternating current is exported after carrying out inversion conversion to the output voltage of DC filter units (40).
2. the intelligent sine voltage change-over circuit of PFC interleaving inverse excitation full-bridges is based on as claimed in claim 1, and its feature exists In the input block (10) includes socket, insurance (F2), lightning protection resistance (RV1), common mode inhibition inductance (L1), safety electricity Hold (CX1) and rectifier bridge (DB1), the insurance (F2) is serially connected with the zero line of socket or live wire, the common mode inhibition inductance (L1) front end is parallel to socket, and the lightning protection resistance (RV1) is parallel to the front end of common mode inhibition inductance (L1), the safety electricity The input of appearance (CX1) and rectifier bridge (DB1) is parallel to the rear end of common mode inhibition inductance (L1), the rectifier bridge (DB1) Output end is parallel with filter capacitor (C1).
3. the intelligent sine voltage change-over circuit of PFC interleaving inverse excitation full-bridges is based on as claimed in claim 1, and its feature exists In, the PFC boost unit (20) include boost inductance (L2), the 3rd switching tube (Q5), the first commutation diode (D1) and Second electrochemical capacitor (C2), the front end of the boost inductance (L2) is connected to the output end of input block (10), described liter of piezoelectricity The rear end for feeling (L2) is connected to the drain electrode of the 3rd switching tube (Q5), and the source electrode of the 3rd switching tube (Q5) connects front end ground, described The grid of the 3rd switching tube (Q5) is used to access pwm control signal all the way, the drain electrode connection first of the 3rd switching tube (Q5) The anode of commutation diode (D1), the negative electrode of first commutation diode (D1) as PFC boost unit (20) output end, And the negative electrode of first commutation diode (D1) connects the positive pole of the second electrochemical capacitor (C2), the negative pole of the second electrochemical capacitor (C2) Connect front end ground.
4. the intelligent sine voltage change-over circuit of PFC interleaving inverse excitation full-bridges is based on as claimed in claim 3, and its feature exists In, also include a MCU control unit (80), the grid of the first switch pipe (Q6), the grid of second switch pipe (Q7) and The grid of the 3rd switching tube (Q5) is connected to MCU control unit (80), and the MCU control unit (80) for exporting respectively Pwm signal to first switch pipe (Q6), second switch pipe (Q7) and the 3rd switching tube (Q5), with control first switch pipe (Q6), Second switch pipe (Q7) and the 3rd switching tube (Q5) on off operating mode.
5. the intelligent sine voltage change-over circuit of PFC interleaving inverse excitation full-bridges is based on as claimed in claim 4, and its feature exists In the MCU control unit (80) includes single-chip microcomputer (U1) and its peripheral circuit.
6. the intelligent sine voltage change-over circuit of PFC interleaving inverse excitation full-bridges is based on as claimed in claim 4, and its feature exists In, an AC sampling unit (70) is also included, the AC sampling unit (70) is connected to the input of input block (10) Between MCU control unit (80), the AC sampling unit (70) for gather input block (10) AC voltage simultaneously Feed back to MCU control unit (80).
7. the intelligent sine voltage change-over circuit of PFC interleaving inverse excitation full-bridges is based on as claimed in claim 6, and its feature exists In the AC sampling unit (70) includes amplifier (U9B), and two inputs of the amplifier (U9B) pass through current limliting respectively Resistance and be connected to the input of input block (10), the output end of the amplifier (U9B) is connected to MCU control unit (80).
8. the intelligent sine voltage change-over circuit of PFC interleaving inverse excitation full-bridges is based on as claimed in claim 4, and its feature exists In being connected with the first sampling resistor (R2A), the 3rd switching tube between the source electrode and front end ground of the 3rd switching tube (Q5) (Q5) source electrode is connected to MCU control unit (80), and MCU control unit (80) is made by first sampling resistor (R2A) Gather the electric signal of the 3rd switching tube (Q5) source electrode.
9. the intelligent sine voltage change-over circuit of PFC interleaving inverse excitation full-bridges is based on as claimed in claim 4, and its feature exists In, a D/C voltage sampling unit (50) is also included, the D/C voltage sampling unit (50) includes second for being sequentially connected in series and adopts Sample resistance (R13) and the 3rd sampling resistor (R15), the front end of second sampling resistor (R13) are connected to DC filter units (40) output end, the rear end of the 3rd sampling resistor (R15) is connected to MCU control unit (80), is adopted by described second Sample resistance (R13) and the 3rd sampling resistor (R15) and make MCU control unit (80) gather the telecommunications of DC filter units (40) outputs Number.
10. the intelligent sine voltage change-over circuit of PFC interleaving inverse excitation full-bridges, its feature are based on as claimed in claim 4 Be, the inversion reversed phase unit (60) including by the 4th switching tube (Q1), the 5th switching tube (Q2), the 6th switching tube (Q3) and The inverter bridge of the 7th switching tube (Q4) composition, the grid of the 4th switching tube (Q1), grid, the 6th of the 5th switching tube (Q2) The grid of the grid of switching tube (Q3) and the 7th switching tube (Q4) is connected to MCU control unit (80), is controlled by the MCU Unit (80) processed and control the 4th switching tube (Q1), the 5th switching tube (Q2), the 6th switching tube (Q3) and the 7th switching tube (Q4) On or off, to make inversion reversed phase unit (60) output AC voltage.
CN201611225468.6A 2016-12-27 2016-12-27 Intelligent sine voltage change-over circuit based on PFC interleaving inverse excitation full-bridges CN106787798A (en)

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CN201611225468.6A CN106787798A (en) 2016-12-27 2016-12-27 Intelligent sine voltage change-over circuit based on PFC interleaving inverse excitation full-bridges
PCT/CN2017/079189 WO2018120483A1 (en) 2016-12-27 2017-04-01 Pfc interleaved flyback full bridge based intelligent sine-wave voltage conversion circuit

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