CN106208721A - The double forward converter of a kind of integrated series and parallel combination type - Google Patents
The double forward converter of a kind of integrated series and parallel combination type Download PDFInfo
- Publication number
- CN106208721A CN106208721A CN201610854125.XA CN201610854125A CN106208721A CN 106208721 A CN106208721 A CN 106208721A CN 201610854125 A CN201610854125 A CN 201610854125A CN 106208721 A CN106208721 A CN 106208721A
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- Prior art keywords
- switching tube
- transformator
- filter capacitor
- output
- input
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
- H02M3/337—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 in push-pull configuration
- H02M3/3376—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 in push-pull configuration with automatic control of output voltage or current
- H02M3/3378—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 in push-pull configuration with automatic control of output voltage or current in a push-pull configuration of the parallel type
Abstract
nullThe invention discloses the double forward converter of a kind of integrated series and parallel combination type，Including switching tube Q1、Q2、Q3、Q4、Transformator T1、T2、Pwm control circuit、Input filter capacitor C1、Output filter capacitor C2、Commutation diode D1 and D3、Sustained diode 2 and D4、Energy storage inductor L1 and L2、Feedback and overvoltage crowbar、Current foldback circuit，The present invention is by controlling switching tube Q1、Q2 and Q3、Q4 alternately opens and closes，Control energy storage inductor L1 and L2 alternately to release energy to load，It is that to be transformed to output voltage be DC12V DC28V to DC800 DC1000V by input voltage，Meet some important events and the demand of this quasi-converter of special dimension，There is reliability high、Redundant parallel and the feature of input extra-high pressure scope.
Description
Technical field
The present invention relates to circuit converter technical field, a kind of integrated series and parallel combination type
Double forward converters.
Background technology
At present, standard isolated DC/DC changer input voltage substantial scope have DC9V～DC18V, DC18V～DC36V,
DC36V～DC72V, DC66V～DC160V and DC200V～DC400V five kinds, VICOR company of the external U.S., Japan's LAMBDA public affairs
Department and U.S. SynQor are the professional production business of the products such as standard isolated DC/DC changer, and it manufactures and designing technique level
All the time being in industry-leading status, the input parameter of main development and production product is also only above-mentioned five kinds, but input extra-high pressure
In DC800V～DC1000V field, famous foreign manufacturer does not has a product design, and in some important events of China and special
In field, this input voltage range parametric converter is needed to design.
Summary of the invention
The present invention is for avoiding the weak point existing for above-mentioned prior art, it is provided that a kind of integrated series and parallel
The double forward converter of combination type.
The present invention solves technical problem and be the technical scheme is that
The double forward converter of a kind of integrated series and parallel combination type, including switching tube Q1, Q2, Q3, Q4, transformator T1,
T2, pwm control circuit, input filter capacitor C1, output filter capacitor C2, commutation diode D1 and D3, sustained diode 2 and
D4, energy storage inductor L1 and L2, feedback and overvoltage crowbar, current foldback circuit, it is characterised in that: described filter capacitor C1 with
DC source is connected, and switching tube Q1 and switching tube Q2 is connected in transformator T1 loop of power circuit, switching tube Q3 and switching tube Q4
It is connected in transformator T2 loop of power circuit, the drain electrode of switching tube Q1 and the drain electrode of switching tube Q3 and the output of input filter capacitor C1
Anode is connected, and the Same Name of Ends of the primary coil of transformator T1 is connected with the source electrode of switching tube Q1, the primary coil of transformator T1
Different name end be connected with the drain electrode of switching tube Q2, the Same Name of Ends of the primary coil of transformator T2 is connected with the source electrode of switching tube Q3,
The different name end of the primary coil of transformator T2 is connected with the drain electrode of switching tube Q4, the source electrode of switching tube Q2, Q4 and input filter electricity
The output negative terminal holding C1 is connected, and switching tube Q1, Q2 are connected with two control ends of pwm control circuit respectively with the grid of Q3, Q4,
The Same Name of Ends of the secondary coil of transformator T1, T2 connects commutation diode D1 and D3 respectively, the secondary coil of transformator T1 different
Name end is connected with energy storage inductor L1, sustained diode 2 respectively, and the other end of sustained diode 2 is defeated with filter capacitor C2's
Going out anode to be connected, the different name end of the secondary coil of transformator T2 is connected with energy storage inductor L2, sustained diode 4 respectively, continuous
The other end of stream diode D4 is connected with the output plus terminal of filter capacitor C2, and output filter capacitor C2 is connected to two outfans
Between, output negative terminal and energy storage inductor L1, energy storage inductor L2, feedback and the negative of overvoltage crowbar of output filter capacitor C2
Input, the negative-phase input of current foldback circuit are connected, the output plus terminal of output filter capacitor C2 respectively with feedback and mistake
The normal phase input end of voltage protection circuit, the normal phase input end of current foldback circuit are connected, feedback and overvoltage crowbar and mistake
The outfan of stream protection circuit is connected with pwm control circuit feedback input end by opto-coupler chip Q5 with Q6 respectively.
Preferably, described pwm control circuit is powered and driving element by integrated circuit and the periphery thereof of main control chip TL494
Composition.
Preferably, described power module input voltage covers DC800-DC1000V, and output voltage covers DC12V-DC28V.
The operation principle of the present invention is:
When switching tube Q1, Q2 and Q3, Q4 alternately open, transformator T1, T2 energy is handed over respectively through commutation diode D1 and D3
For to energy storage inductor L1 and L2 energy storage, alternately releasing energy to load, electric capacity C2 plays the effect of output filtering simultaneously；Work as switch
When pipe Q1, Q2 and Q3, Q4 alternately close, load is alternately discharged by energy storage inductor L1 and L2 respectively through sustained diode 2 and D4
Energy, electric capacity C2 plays the effect of output filtering.Switching tube series connection realizes the effect of switching tube dividing potential drop, is born by each switching tube
Average voltage dividing potential drop, it is achieved input extra-high pressure is when being DC800V～DC1000V, and switching tube is not by pressure restriction, permissible
Normal work, inputs and exports two set loop of power circuit parallel connections and play power expansion and the effect of redundancy.
Main control chip TL494 normally works, and drives A and drives B to interlock open-minded, when driving A to lead to, drives B to close；Drive B
Time logical, A is driven to close, owing to the Dead Time of main control chip is by outside dead band resistance adjustable settings, so there are not two groups of drivings
Situation about simultaneously opening.
Drive the staggered principle opened according to main control chip TL494 two groups, when drive A to open to simultaneously drive switching tube Q1 and
Q2, power supply input power loop turn on, according to forward converter principle, transformator T1 own primary and secondary turns than coupled characteristic,
Transformator T1 plays electrical isolation and energy transmission effect, and now T1 level Same Name of Ends of transformator passes through commutation diode D1 to storage
Can inductance L1 and load transmission energy；When driving, A is the most open-minded, and when switching tube Q1 and Q2 does not works, energy storage inductor L1 is through afterflow
Energy is released to load by diode D2.
Simultaneously driving switching tube Q3 and Q4 when driving B to open, power supply input power loop turns on, former according to forward converter
Reason, transformator T2 own primary and secondary turns are than coupled characteristic, and transformator T2 plays electrical isolation and energy transmission effect, now
Energy storage inductor L2 and load are transmitted energy by commutation diode D3 by T2 level Same Name of Ends of transformator；When driving, B is the most open-minded, opens
When pass pipe Q3 and Q4 does not works, energy is released to load by T2 level energy storage inductor L2 of transformator through sustained diode 4.
In the present invention, two groups of loop of power circuit input and are output as parallel relationship, and main control chip TL494 two groups driving is interleaved
Logical, so during transformator T1 loop works, changer T1 transmits energy, energy storage inductor L2 releases energy, and in like manner transformator T2 returns
During the work of road, changer T2 transmits energy, and secondary energy storage inductor L1 releases energy, it is achieved two transformator and two storages independently
Can alternately store energy and transmission output energy by inductance, reach the function of power expansion.
Owing to changer input is for extra-high pressure DC800V～DC1000V, single switching tube Q1 is difficult to bear the highest
Pressure, so using the switching tube series connection of two same model and parameter, it is achieved switching tube bears pressure average dividing potential drop, the most single
Switching tube bears a most pressure half voltage, it is possible to achieve input extra-high pressure design.
The present invention solves the tradition external and domestic changer supertension input similar changer of DC800-DC1000V and sets
The typical products of meter, DC/DC inverter power circuit uses two groups of forward converter parallel combinations to form double forward converter, is just often organizing
Excitation circuit uses two switching tube series connection, it is achieved the double forward converter of integrated series and parallel combination type, meet input super
High voltage and redundant parallel expand the requirement of power.
Compared with prior art, the invention has the beneficial effects as follows:
1, the present invention uses the double forward converter of integrated series and parallel combination type, has higher reliability, input voltage
Covering DC800-DC1000V, output voltage covers DC12V-DC24V(single channel), its volume is 116.8 × 61 × 13(unit:
Mm, the full brick of standard), peak power output is 500W, and peak efficiency is 91%, and power density reaches as high as 89.9W/in3, abroad
Manufacturer, temporarily without similar changer product, can meet some important events and the demand of this quasi-converter of special dimension.
2, changer is isolation method, and isolation voltage is not less than DC1000V；
The invention has the beneficial effects as follows that DC/DC inverter power circuit uses two groups of forward converter parallel combinations to form double normal shock electricity
Road, often uses two switching tube series connection, it is achieved the double forward converter of integrated series and parallel combination type in group forward converter, full
Foot input extra-high pressure and redundant parallel expand the requirement of power, and external manufacturer is temporarily without similar changer product, permissible
Meet some important events and the demand of this quasi-converter of special dimension.
Accompanying drawing explanation
Fig. 1 is the present invention double forward converter structural representation of a kind of integrated series and parallel combination type.
Detailed description of the invention
See Fig. 1, the double forward converter of a kind of integrated series and parallel combination type, including switching tube Q1, Q2, Q3,
Q4, transformator T1, T2, pwm control circuit, input filter capacitor C1, output filter capacitor C2, commutation diode D1 and D3, continuous
Stream diode D2 and D4, energy storage inductor L1 and L2, feedback and overvoltage crowbar, current foldback circuit, it is characterised in that: described
Filter capacitor C1 is connected with DC source, and switching tube Q1 and switching tube Q2 is connected in transformator T1 loop of power circuit, switching tube
Q3 and switching tube Q4 is connected in transformator T2 loop of power circuit, the drain electrode of switching tube Q1 and the drain electrode of switching tube Q3 and input filter
The output plus terminal of electric capacity C1 is connected, and the Same Name of Ends of the primary coil of transformator T1 is connected with the source electrode of switching tube Q1, transformator T1
Primary coil different name end be connected with the drain electrode of switching tube Q2, the Same Name of Ends of the primary coil of transformator T2 and switching tube Q3
Source electrode be connected, the different name end of the primary coil of transformator T2 is connected with the drain electrode of switching tube Q4, the source electrode of switching tube Q2, Q4 and
The output negative terminal of input filter capacitor C1 is connected, switching tube Q1, Q2 and Q3, Q4 grid respectively with two of pwm control circuit
Controlling end to be connected, the Same Name of Ends of the secondary coil of transformator T1, T2 connects the secondary of commutation diode D1 and D3, transformator T1 respectively
The different name end of level coil is connected with energy storage inductor L1, sustained diode 2 respectively, the other end of sustained diode 2 and filtering
The output plus terminal of electric capacity C2 is connected, the different name end of the secondary coil of transformator T2 respectively with energy storage inductor L2, fly-wheel diode
D4 is connected, and the other end of sustained diode 4 is connected with the output plus terminal of filter capacitor C2, and output filter capacitor C2 connects
Between the two outputs, the output negative terminal of output filter capacitor C2 is protected with energy storage inductor L1, energy storage inductor L2, feedback and overvoltage
The negative-phase input of protection circuit, the negative-phase input of current foldback circuit are connected, and the output plus terminal of output filter capacitor C2 divides
The not normal phase input end with feedback and the normal phase input end of overvoltage crowbar, current foldback circuit is connected, feedback and overvoltage
The outfan of protection circuit and current foldback circuit is respectively by opto-coupler chip Q5 and Q6 and pwm control circuit feedback input end phase
Even.
Described pwm control circuit is made up of with driving element integrated circuit and the peripheral power supply thereof of main control chip TL494.
Described DC supply input voltage covers DC800-DC1000V, and outfan output voltage covers DC12V-DC28V.
The double forward converter of the one integrated series and parallel combination type that the present invention provides is by such a way work
Make:
Main control chip TL494 normally works, and drives A and drives B to interlock open-minded, when driving A to lead to, drives B to close；When driving B to lead to,
Driving A to close, owing to the Dead Time of main control chip is by outside dead band resistance adjustable settings, opening so there are not two groups of drivings simultaneously
Logical situation.
Drive the staggered principle opened according to main control chip TL494 two groups, when drive A to open to simultaneously drive switching tube Q1 and
Q2, power supply input power loop turn on, according to forward converter principle, transformator T1 own primary and secondary turns than coupled characteristic,
Transformator T1 plays electrical isolation and energy transmission effect, and now T1 level Same Name of Ends of transformator passes through commutation diode D1 to storage
Can inductance L1 and load transmission energy；When driving, A is the most open-minded, and when switching tube Q1 and Q2 does not works, energy storage inductor L1 is through afterflow
Energy is released to load by diode D2.
Simultaneously driving switching tube Q3 and Q4 when driving B to open, power supply input power loop turns on, former according to forward converter
Reason, transformator T2 own primary and secondary turns are than coupled characteristic, and transformator T2 plays electrical isolation and energy transmission effect, now
Energy storage inductor L2 and load are transmitted energy by commutation diode D3 by T2 level Same Name of Ends of transformator；When driving, B is the most open-minded, opens
When pass pipe Q3 and Q4 does not works, energy is released to load by T2 level energy storage inductor L2 of transformator through sustained diode 4.
Input voltage is that to be transformed to output voltage be DC12V-DC28V to DC800-DC1000V the most at last, meets some important
Occasion and the demand of this quasi-converter of special dimension.
The present invention is exemplarily described by technical solution of the present invention above in conjunction with accompanying drawing, it is clear that the present invention is specifically real
Now it is not subject to the restrictions described above, if the various unsubstantialities that the method design that have employed the present invention is carried out with technical scheme
Improve, or the most improved design by invention and technical scheme directly apply to other occasion, all at the protection model of the present invention
Within enclosing.
Claims (3)
1. the double forward converter of integrated series and parallel combination type, including switching tube Q1, Q2, Q3, Q4, transformator
T1, T2, pwm control circuit, input filter capacitor C1, output filter capacitor C2, commutation diode D1 and D3, sustained diode 2
With D4, energy storage inductor L1 and L2, feedback and overvoltage crowbar, current foldback circuit, it is characterised in that: described filter capacitor C1
Being connected with DC source, switching tube Q1 and switching tube Q2 is connected in transformator T1 loop of power circuit, switching tube Q3 and switching tube
Q4 is connected in transformator T2 loop of power circuit, and the drain electrode of switching tube Q1 and the drain electrode of switching tube Q3 are defeated with input filter capacitor C1's
Going out anode to be connected, the Same Name of Ends of the primary coil of transformator T1 is connected with the source electrode of switching tube Q1, the primary coil of transformator T1
Different name end be connected with the drain electrode of switching tube Q2, the source electrode phase of the Same Name of Ends of the primary coil of transformator T2 and switching tube Q3
Even, the different name end of the primary coil of transformator T2 is connected with the drain electrode of switching tube Q4, the source electrode of switching tube Q2, Q4 and input filter
The output negative terminal of electric capacity C1 is connected, switching tube Q1, Q2 and Q3, Q4 grid respectively with two of pwm control circuit control end phases
Even, the Same Name of Ends of the secondary coil of transformator T1, T2 connects commutation diode D1 and D3 respectively, the secondary coil of transformator T1
Different name end is connected with energy storage inductor L1, sustained diode 2 respectively, and the other end of sustained diode 2 is with filter capacitor C2's
Output plus terminal is connected, and the different name end of the secondary coil of transformator T2 is connected with energy storage inductor L2, sustained diode 4 respectively,
The other end of sustained diode 4 is connected with the output plus terminal of filter capacitor C2, and output filter capacitor C2 is connected to two outputs
Between end, the output negative terminal of output filter capacitor C2 is negative with energy storage inductor L1, energy storage inductor L2, feedback and overvoltage crowbar
Phase input, the negative-phase input of current foldback circuit are connected, the output plus terminal of output filter capacitor C2 respectively with feedback and
The normal phase input end of overvoltage crowbar, the normal phase input end of current foldback circuit are connected, feedback and overvoltage crowbar and
The outfan of current foldback circuit is connected with pwm control circuit feedback input end by opto-coupler chip Q5 with Q6 respectively.
The double forward converter of one the most according to claim 1 integrated series and parallel combination type, it is characterised in that:
Described pwm control circuit is made up of with driving element integrated circuit and the peripheral power supply thereof of main control chip TL494.
The double forward converter of one the most according to claim 1 integrated series and parallel combination type, it is characterised in that:
Described DC supply input voltage covers DC800-DC1000V, and outfan output voltage covers DC12V-DC28V.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610854125.XA CN106208721A (en) | 2016-09-27 | 2016-09-27 | The double forward converter of a kind of integrated series and parallel combination type |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610854125.XA CN106208721A (en) | 2016-09-27 | 2016-09-27 | The double forward converter of a kind of integrated series and parallel combination type |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110138229A (en) * | 2019-06-20 | 2019-08-16 | 浙江万胜智能科技股份有限公司 | A kind of double-transistor flyback formula Switching Power Supply with clamper protection |
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| US20100296319A1 (en) * | 2007-09-26 | 2010-11-25 | Liebert Corporation | Power source module with broad input voltage range |
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| CN110138229A (en) * | 2019-06-20 | 2019-08-16 | 浙江万胜智能科技股份有限公司 | A kind of double-transistor flyback formula Switching Power Supply with clamper protection |
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