CN106533194A - PFC forward full-bridge-based intelligent type correction filtering voltage conversion circuit - Google Patents
PFC forward full-bridge-based intelligent type correction filtering voltage conversion circuit Download PDFInfo
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- CN106533194A CN106533194A CN201611159589.5A CN201611159589A CN106533194A CN 106533194 A CN106533194 A CN 106533194A CN 201611159589 A CN201611159589 A CN 201611159589A CN 106533194 A CN106533194 A CN 106533194A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
-
- 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
- H02M1/12—Arrangements for reducing harmonics from ac 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion 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
- H02M3/325—Conversion 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
- H02M3/335—Conversion 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
- H02M3/33569—Conversion 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 having several active switching elements
-
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion 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
- H02M5/42—Conversion 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
- H02M5/44—Conversion 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
- H02M5/453—Conversion 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
- H02M5/458—Conversion 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
-
- 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
- H02M7/539—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 with automatic control of output wave form or frequency
- H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a PFC forward full-bridge-based intelligent type correction filtering voltage conversion circuit. The PFC forward full-bridge-based intelligent type correction filtering voltage conversion circuit comprises an input unit, a PFC voltage boosting unit, an isolation type two-transistor forward converter and an inversion phase reversal unit, wherein the isolation type two-transistor forward converter comprises a first switching tube, a second switching tube, a first fly-wheel diode, a second fly-wheel diode, a second rectifying diode, a transformer, a filtering inductor, and a first electrolytic capacitor; the drain of the first switching tube is connected to the output end of the PFC voltage boosting unit; the source of the first switching tube is connected to the first end of a primary winding of the transformer; the second end of the primary winding of the transformer is connected to the drain of the second switching tube; the source of the second switching tube is connected with a front leading end; the gate of the first switching tube and the gate of the second switching tube are used for connecting the same PWM signals; and the inversion phase reversal unit is used for performing inversion conversion on the output voltage of the isolation type two-transistor forward converter and outputting an alternating current. By adoption of the intelligent type correction filtering voltage conversion circuit, the PF value and the output voltage quality can be improved.
Description
Technical field
A kind of the present invention relates to voltage conversion circuit, more particularly to intelligent amendment wave voltage based on PFC normal shock full-bridges
Change-over circuit.
Background technology
In prior art, the intelligent boost-buck conversion equipment for turning AC by AC is otherwise known as travelling insert row, in the device, amendment
Wave voltage change-over circuit is its Key Circuit, is a kind of circuit that can realize AC-AC conversion, can be realized in AC-AC conversion
The function of buck burning voltage and frequency.But current AC-AC just meaningful formula equipment Market great majority are non-isolation type
Topological circuit, and PF values are low, output voltage quality is low, security reliability is poor.
The content of the invention
The technical problem to be solved in the present invention is, for the deficiencies in the prior art, there is provided one kind can improve voltage conversion
The PF values of device, output voltage quality can be improved, and the safe and reliable intelligent amendment wave voltage based on PFC normal shock full-bridges
Change-over circuit.
For solving above-mentioned technical problem, the present invention is adopted the following technical scheme that.
A kind of intelligent amendment wave voltage change-over circuit based on PFC normal shock full-bridges, which includes：One input block, uses
In output DC voltage；One PFC boost unit, is connected to the outfan of input block, for the output voltage to input block
Carry out boost conversion；One isolated form two-transistor forward converter, includes first switch pipe, second switch pipe, two pole of the first afterflow
Pipe, the second fly-wheel diode, the second commutation diode, transformator, filter inductance and the first electrochemical capacitor, the first switch pipe
Drain electrode be connected to the outfan of PFC boost unit, the source electrode of the first switch pipe is connected to the of transformer primary side winding
One end, the second end of the transformer primary side winding are connected to the drain electrode of second switch pipe, and the source electrode of the second switch pipe connects
Front end ground, the grid of the grid and second switch pipe of the first switch pipe are used for accessing identical pwm signal, and described first continues
The negative electrode of stream diode is connected to the drain electrode of first switch pipe, and the anode of first fly-wheel diode is connected to transformer primary side
Second end of winding, the negative electrode of second fly-wheel diode are connected to the first end of transformer primary side winding, and described second continues
The anode of stream diode connects front end ground, and the first end of the transformer secondary winding is connected to the anode of the second commutation diode,
The second termination back-end ground of the transformer secondary winding, before the negative electrode of second commutation diode is connected to filter inductance
End, the rear end of the filter inductance connect the positive pole of the first electrochemical capacitor, and the negative pole of first electrochemical capacitor connects rear end ground,
Outfan of the rear end of the filter inductance as isolated form two-transistor forward converter；One inversion reversed phase unit, is connected to isolation
The outfan of type two-transistor forward converter, the inversion reversed phase unit is for the output voltage to isolated form two-transistor forward converter
Carry out output AC electricity after 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 are serially connected with the zero line or live wire of socket, and the front end of the common mode inhibition inductance is parallel to socket, described anti-
Thunder and lightning resistance is parallel to the input of the front end of common mode inhibition inductance, the safety electric capacity and rectifier bridge and is parallel to common mode inhibition electricity
The rear end of sense, the outfan of the rectifier bridge are 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 are connected to the outfan 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 connect front end ground, and the grid of the 3rd switching tube is used for accessing all the way
Pwm control signal, the anode of drain electrode first commutation diode of connection of the 3rd switching tube, first commutation diode
Outfan of the negative electrode as PFC boost unit, 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, the PFC boost unit also includes the first driving resistance, the second driving resistance and drives diode,
The grid of the 3rd switching tube is connected to the anode for driving diode, and described first drives resistor coupled in parallel in driving diode
Two ends, the negative electrode of the driving diode are used for accessing pwm control signal, and the anode of the driving diode is driven by second
Resistance is connected to 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, the MCU control unit be used for respectively 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, 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 for gathering the voltage of input block AC and feeding 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 outfan 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 signal of telecommunication 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 rear end of filter inductance, and the described 3rd
The rear end of sampling resistor is connected to MCU control unit, makes MCU controls by second sampling resistor and the 3rd sampling resistor
The signal of telecommunication of unit collection filter inductance rear end.
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, the grid of the 4th switching tube, the grid of the 5th switching tube, the grid and the 7th of the 6th switching tube
The grid of switching tube is connected to MCU control unit, controls the 4th switching tube by the MCU control unit, the 5th opens
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 amendment wave voltage change-over circuit based on PFC normal shock full-bridges disclosed by the invention, using input block
Output ripple DC voltage after rectification and filtering is carried out to line voltage, afterwards using PFC boost unit to pulsating dc voltage
Boosting process is carried out, in isolated form two-transistor forward converter, first switch pipe is a pair of signal identicals with second switch pipe
Pwm control signal；First switch pipe is simultaneously turned on second switch pipe, and the primary coil of transformator is bonded to by-pass through magnetic core Rhizoma Nelumbinis
Circle, exports by the second rectifies and after the first electrochemical capacitor is filtered into direct current and gives inversion reversed phase unit；
When first switch pipe is turned off with second switch pipe, in order to keep the primary coil sense of current of transformator identical, described first
Fly-wheel diode and the conducting of the second fly-wheel diode, and magnetic reset is carried out to magnetic core, by changing the turn ratio of transformer primary secondary
Secondary voltage can be made below or above former limit input voltage, and then reach buck or boost purpose.Based on said structure, this
The bright isolation transmission for realizing voltage, can effectively improve the PF values of step-up/down conversion equipment, while also improving output voltage
Quality so that voltage conversion process is more safe and reliable.
Description of the drawings
Fig. 1 is the circuit theory diagrams for correcting wave 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
With reference to the accompanying drawings and examples the present invention is described in more detail.
The invention discloses a kind of intelligent amendment wave voltage change-over circuit based on PFC normal shock full-bridges, with reference to Fig. 1 to figure
Shown in 3, which includes：
One input block 10, for exporting DC voltage；
One PFC boost unit 20, is connected to the outfan of input block 10, for entering to the output voltage of input block 10
Row boost conversion；
One isolated form two-transistor forward converter 30, includes first switch pipe Q6, second switch pipe Q7, two pole of the first afterflow
Pipe D3, the second sustained diode 2, the second commutation diode D5, transformator T1, filter inductance L3 and the first electrochemical capacitor C3, institute
The drain electrode for stating first switch pipe Q6 is connected to the outfan of PFC boost unit 20, and the source electrode of the first switch pipe Q6 is connected to
The first end of transformator T1 primary side windings, the second end of the transformator T1 primary side windings are connected to the leakage of second switch pipe Q7
Pole, the source electrode of the second switch pipe Q7 connect front end ground, the grid of the grid and second switch pipe Q7 of the first switch pipe Q6
For accessing identical pwm signal, the negative electrode of first sustained diode 3 is connected to the drain electrode of first switch pipe Q6, described
The anode of the first sustained diode 3 is connected to the second end of transformator T1 primary side windings, the moon of second sustained diode 2
Pole is connected to the first end of transformator T1 primary side windings, and the anode of second sustained diode 2 connects front end ground, the transformation
The first end of device T1 vice-side windings is connected to the anode of the second commutation diode D5, the second end of the transformator T1 vice-side windings
Rear end ground is connect, the negative electrode of the second commutation diode D5 is connected to the front end of filter inductance L3, after the filter inductance L3
The positive pole of the first electrochemical capacitor C3 of end connection, the negative pole connection rear end ground of the first electrochemical capacitor C3, the filter inductance L3
Rear end as isolated form two-transistor forward converter 30 outfan；
One inversion reversed phase unit 60, is connected to the outfan of isolated form two-transistor forward converter 30, the inversion paraphase list
Unit 60 carries out output AC electricity after inversion conversion for the output voltage to isolated form two-transistor forward converter 30.
In above-mentioned amendment wave voltage change-over circuit, export after carrying out rectification and filtering to line voltage using input block 10
Pulsating dc voltage, carries out boosting process using PFC boost unit 20 to pulsating dc voltage afterwards, in isolated form double tube positive exciting
In changer 30, first switch pipe Q6 and second switch pipe Q7 is a pair of signal identical pwm control signals；First switch pipe Q6
Simultaneously turn on second switch pipe Q7, the primary coil of transformator T1 is bonded to secondary coil through magnetic core Rhizoma Nelumbinis, by the second rectification two
The rectification of pole pipe D5 and export to inversion reversed phase unit 60 after the first electrochemical capacitor C3 is filtered into direct current；When first switch pipe
When Q6 and second switch pipe Q7 is turned off, in order to keep the primary coil sense of current of transformator T1 identical, first afterflow two
Pole pipe D3 is turned on the second sustained diode 2, and carries out magnetic reset to magnetic core, by changing the turn ratio of transformator T1 original secondary
Secondary voltage can be made below or above former limit input voltage, and then reach buck or boost purpose.Based on said structure, this
The bright isolation transmission for realizing voltage, can effectively improve the PF values of step-up/down conversion equipment, while also improving output voltage
Quality so that voltage conversion process is more safe and reliable.
In the present embodiment, the input block 10 includes 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 or live wire of socket, the common mode inhibition inductance
The front end of L1 is parallel to socket, and the lightning protection resistance RV1 is parallel to the front end of common mode inhibition inductance L1, the safety electric capacity CX1
The rear end of common mode inhibition inductance L1 is parallel to the input of rectifier bridge DB1, the outfan of the rectifier bridge DB1 is parallel with filter
Ripple electric capacity C1.
As a kind of optimal way, the PFC boost unit 20 include boost inductance L2, the 3rd switching tube Q5, first
The front end of commutation diode D1 and the second electrochemical capacitor C2, the boost inductance L2 is connected to the outfan of input block 10, institute
The rear end for stating boost inductance L2 is connected to the drain electrode of the 3rd switching tube Q5, and the source electrode of the 3rd switching tube Q5 meets front end ground, institute
The grid for stating the 3rd switching tube Q5 is used for accessing pwm control signal all the way, and the drain electrode connection first of the 3rd switching tube Q5 is whole
The anode of stream diode D1, the outfan of the negative electrode of the first commutation diode D1 as PFC boost unit 20, and this first
The negative electrode of commutation 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.
In above-mentioned PFC boost unit 20, when AC-input voltage samples AC voltages, PFC enters boost mode, to carry
High AC turns the PF values of AC intelligence blood pressure lowering conversion topologies circuits, the PFC when AC-input voltage samples AC voltages less than AC220V
Into boost mode, to improve the PF values that AC turns AC intelligence blood pressure lowering conversion topologies circuits, when voltage is higher than AC220V, Q5 not works
Make, pfc circuit does not boost.Specific boosting principle is as follows：When Q5 is turned on, the boosted inductance L2 of the electric current on C1, Q5 to GND shapes
Into loop, boost inductance L2 storage energy；When Q5 is turned off, the faradism more much higher than input voltage on boost inductance, can be formed
Kinetic potential, induction electromotive force formed Jing after continued flow tube D1 carries out rectification unidirectional pulse voltage give again C2 electric capacity enter filter and energy storage.And
And Q5 is that the input AC sine wave adopted according to control chip changes ON time to increase or reduce Q5 so that electric current with
Voltage-phase becomes unanimously to improve PF values.When control chip U1 detects input voltage equal to or higher than 230V line voltages,
High frequency modulated circuit Q5MOS is closed, the voltage after rectifying and wave-filtering direct Jing L2, D1 enter filter and energy storage to C2 electric capacity.
Further, in order to improve the driving force of switch tube, the PFC boost unit 20 also includes the first driving
Resistance R18, second drive resistance R22 and drive diode D4, the grid of the 3rd switching tube Q5 to be connected to driving diode
The anode of D4, the first driving resistance R18 are parallel to the two ends for driving diode D4, and the negative electrode of the driving diode D4 is used
In pwm control signal is accessed, the anode of the driving diode D4 is connected to front end ground by the second driving resistance R22.
In order to rectification is better achieved, the isolated form two-transistor forward converter 30 also includes one the 3rd commutation diode
The negative electrode of D6, the 3rd commutation diode D6 is connected to the first end of transformator T1 vice-side windings, two pole of the 3rd rectification
The anode of pipe D6 is connected to the second end of transformator T1 vice-side windings.
Used as a kind of optimal way, 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 for difference 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 signal of telecommunication of AC, an AC sampling unit 70, the AC sampling unit is also included
Between 70 inputs for being connected to input block 10 and MCU control unit 80, the AC sampling unit 70 is used for gathering input
The voltage of 10 AC of unit simultaneously feeds back to MCU control unit 80.
With regard to the concrete composition of the AC sampling unit 70, the AC sampling unit 70 includes amplifier U9B, the fortune
Two inputs for putting U9B are connected to the input of input block 10, the output of amplifier U9B respectively by current-limiting resistance
End is connected to MCU control unit 80.
For the ease of carrying out Real-time Collection to electric current, between the source electrode and front end ground of the 3rd switching tube Q5, is connected with
One sampling resistor R2A, the source electrode of the 3rd switching tube Q5 are 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 the signal of telecommunication.
As a kind of optimal way, in order to be acquired to the DC side signal of telecommunication, the present embodiment also includes a D/C voltage
Sampling unit 40, the D/C voltage sampling unit 40 include 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 rear end of filter inductance L3, the rear end of the 3rd sampling resistor R15
MCU control unit 80 is connected to, and MCU control unit 80 is made by the second sampling resistor R13 and the 3rd sampling resistor R15
The signal of telecommunication of collection filter inductance L3 rear ends.So that MCU control unit 80 controls the dutycycle of inversion reversed phase unit 60.
With regard to 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 the grid and the 7th switching tube Q4 of six switching tube Q3 is connected to MCU control unit 80, single by MCU controls
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
60 output AC voltage of inversion reversed phase unit.
In above-mentioned inversion reversed phase unit 60, loop is formed to load through the filtered DC voltage Jing Q1 of C3, load, Q4
For first half period power frequency level of electric forming；Second half period power frequency level forms loop by Q2, load, Q3, so
A complete power frequency amendment alternating current wave pressure is formed in load.The pwm signal Jing of control chip U1 outputs drives electricity
Send the GATE poles of PWM1H, PWM1L, PWM2H, PWM2L to Q1, Q2, Q3, Q4 behind road respectively.Phase place in inversion phase inverter
It is operated according to the pattern of control chip inner setting with frequency.
In intelligent amendment wave voltage change-over circuit based on PFC normal shock full-bridges disclosed by the invention, compared to existing technology
For, first, the present invention has high PF values, realizes electrical network and isolates with outfan, and safety is very high, meanwhile, it is complete in input
Output voltage, and fixed output frequency can be automatically adjusted in voltage range, and again, output voltage is defeated to correct ripple
Go out, be pressed with automatic shaping function to alternating current, additionally, the present invention program contains voltage and current sampling circuit, can Anti-surging electricity
Pressure and electric current.
The above is preferred embodiments of the present invention, is not limited to the present invention, all technology models in the present invention
Enclose interior done modification, equivalent or improvement etc., should be included in the present invention it is protected in the range of.
Claims (10)
1. a kind of intelligent amendment wave voltage change-over circuit based on PFC normal shock full-bridges, it is characterised in that include：
One input block, for exporting DC voltage；
One PFC boost unit, is connected to the outfan of input block, carries out boosting for the output voltage to input block and turns
Change；
One isolated form two-transistor forward converter, include first switch pipe, second switch pipe, the first fly-wheel diode, second continue
Stream diode, the second commutation diode, transformator, filter inductance and the first electrochemical capacitor, the drain electrode of the first switch pipe connect
The outfan of PFC boost unit is connected to, the source electrode of the first switch pipe is connected to the first end of transformer primary side winding, described
Second end of transformer primary side winding is connected to the drain electrode of second switch pipe, and the source electrode of the second switch pipe meets front end ground, institute
The grid for stating the grid and second switch pipe of first switch pipe is used for accessing identical pwm signal, first fly-wheel diode
Negative electrode be connected to the drain electrode of first switch pipe, the anode of first fly-wheel diode is connected to the of transformer primary side winding
Two ends, the negative electrode of second fly-wheel diode are connected to the first end of transformer primary side winding, second fly-wheel diode
Anode connect front end ground, the first end of the transformer secondary winding is connected to the anode of the second commutation diode, the transformation
The second termination back-end ground of device vice-side winding, the negative electrode of second commutation diode is connected to the front end of filter inductance, described
The rear end of filter inductance connects the positive pole of the first electrochemical capacitor, the negative pole connection rear end ground of first electrochemical capacitor, the filter
Outfan of the rear end of ripple inductance as isolated form two-transistor forward converter；
One inversion reversed phase unit, is connected to the outfan of isolated form two-transistor forward converter, and it is right that the inversion reversed phase unit is used for
The output voltage of isolated form two-transistor forward converter carries out output AC electricity after inversion conversion.
2. the intelligent amendment wave voltage change-over circuit based on PFC normal shock full-bridges as claimed in claim 1, it is characterised in that
The input block includes socket, insurance, lightning protection resistance, common mode inhibition inductance, safety electric capacity and rectifier bridge, the insurance string
It is connected on the zero line or live wire of socket, the front end of the common mode inhibition inductance is parallel to socket, and the lightning protection resistance is parallel to altogether
Mould suppresses the input of the front end of inductance, the safety electric capacity and rectifier bridge to be parallel to the rear end of common mode inhibition inductance, described
The outfan of rectifier bridge is parallel with filter capacitor.
3. the intelligent amendment wave voltage change-over circuit based on PFC normal shock full-bridges as claimed in claim 1, it is characterised in that
The PFC boost unit includes boost inductance, the 3rd switching tube, the first commutation diode and the second electrochemical capacitor, the liter
The front end of voltage inductance is connected to the outfan of input block, and the rear end of the boost inductance is connected to the drain electrode of the 3rd switching tube,
The source electrode of the 3rd switching tube connects front end ground, and the grid of the 3rd switching tube is used for accessing pwm control signal all the way, described
The anode of drain electrode first commutation diode of connection of the 3rd switching tube, the negative electrode of first commutation diode is used as PFC boost
The outfan of unit, and the negative electrode of first commutation diode connects the positive pole of the second electrochemical capacitor, the second electrochemical capacitor it is negative
Pole connects front end ground.
4. the intelligent amendment wave voltage change-over circuit based on PFC normal shock full-bridges as claimed in claim 3, it is characterised in that
The PFC boost unit also includes the first driving resistance, the second driving resistance and drives diode, the 3rd switching tube
Grid is connected to the anode for driving diode, and described first drives resistor coupled in parallel in the two ends for driving diode, the driving two
The negative electrode of pole pipe is used for accessing pwm control signal, and the anode of the driving diode is connected to front end by the second driving resistance
Ground.
5. the intelligent amendment wave voltage change-over circuit based on PFC normal shock full-bridges as claimed in claim 3, it is characterised in that
A MCU control unit, the grid of the grid, the grid of second switch pipe and the 3rd switching tube of the first switch pipe are included also
MCU control unit is connected to, the MCU control unit is used for difference output pwm signal to first switch pipe, second switch
Pipe and the 3rd switching tube, to control first switch pipe, second switch pipe and the 3rd switching tube on off operating mode.
6. the intelligent amendment wave voltage change-over circuit based on PFC normal shock full-bridges as claimed in claim 5, it is characterised in that
Also include an AC sampling unit, the AC sampling unit be connected to input block input and MCU control unit it
Between, the AC sampling unit is used for gathering the voltage of input block AC and feeding back to MCU control unit.
7. the intelligent amendment wave voltage change-over circuit based on PFC normal shock full-bridges as claimed in claim 6, it is characterised in that
The AC sampling unit includes amplifier, and two inputs of the amplifier are connected to input list respectively by current-limiting resistance
The input of unit, the outfan of the amplifier are connected to MCU control unit.
8. the intelligent amendment wave voltage change-over circuit based on PFC normal shock full-bridges as claimed in claim 5, it is characterised in that
The first sampling resistor is connected between the source electrode and front end ground of the 3rd switching tube, and the source electrode of the 3rd switching tube is connected to
MCU control unit, makes MCU control unit gather the signal of telecommunication of the 3rd switching tube source electrode by first sampling resistor.
9. the intelligent amendment wave voltage change-over circuit based on PFC normal shock full-bridges as claimed in claim 5, it is characterised in that
A D/C voltage sampling unit is included also, the D/C voltage sampling unit includes the second sampling resistor and the 3rd being sequentially connected in series
Sampling resistor, the front end of second sampling resistor are connected to the rear end of filter inductance, and the rear end of the 3rd sampling resistor connects
MCU control unit is connected to, MCU control unit collection filter inductance is made by second sampling resistor and the 3rd sampling resistor
The signal of telecommunication of rear end.
10. the intelligent amendment wave voltage change-over circuit based on PFC normal shock full-bridges as claimed in claim 5, it is characterised in that
The inversion reversed phase unit includes the inversion being made up of the 4th switching tube, the 5th switching tube, the 6th switching tube and the 7th switching tube
Bridge, the grid of the 4th switching tube, the grid point of the grid, the grid of the 6th switching tube and the 7th switching tube of the 5th switching tube
MCU control unit is not connected to, the 4th switching tube, the 5th switching tube, the 6th switching tube is controlled by the MCU control unit
With the 7th switching tube on or off, to make the inversion reversed phase unit output AC voltage.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611159589.5A CN106533194A (en) | 2016-12-15 | 2016-12-15 | PFC forward full-bridge-based intelligent type correction filtering voltage conversion circuit |
| PCT/CN2017/076868 WO2018107600A1 (en) | 2016-12-15 | 2017-03-16 | Pfc forward full-bridge based intelligent modified-wave voltage conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611159589.5A CN106533194A (en) | 2016-12-15 | 2016-12-15 | PFC forward full-bridge-based intelligent type correction filtering voltage conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106533194A true CN106533194A (en) | 2017-03-22 |
Family
ID=58339638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611159589.5A Pending CN106533194A (en) | 2016-12-15 | 2016-12-15 | PFC forward full-bridge-based intelligent type correction filtering voltage conversion circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106533194A (en) |
| WO (1) | WO2018107600A1 (en) |
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| WO2018120523A1 (en) * | 2016-12-27 | 2018-07-05 | 广东百事泰电子商务股份有限公司 | Pfc forward conversion half bridge-based smart sine wave voltage conversion circuit |
| CN109474172A (en) * | 2018-11-29 | 2019-03-15 | 广州大学 | A kind of wide input voltage isolated form Cuk converter topology circuit |
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| CN112367748A (en) * | 2020-12-14 | 2021-02-12 | 深圳市华浩德电子有限公司 | Floating type buck-boost PFC circuit and LED driving power supply |
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| WO2018107600A1 (en) | 2018-06-21 |
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Application publication date: 20170322 |