CN106329939A - Switch power supply converter - Google Patents
Switch power supply converter Download PDFInfo
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- CN106329939A CN106329939A CN201610821269.5A CN201610821269A CN106329939A CN 106329939 A CN106329939 A CN 106329939A CN 201610821269 A CN201610821269 A CN 201610821269A CN 106329939 A CN106329939 A CN 106329939A
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- field effect
- effect transistor
- square
- primary coil
- wave
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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
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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)
Abstract
The invention discloses a switch power supply converter. The switch power supply converter comprises a rectification circuit, a transformer, a first field effect transistor, a second field effect transistor, a first resonant capacitor, a second resonant capacitor, an output circuit, a first resistor, and a second resistor. The transformer comprises a first primary coil, a second primary coil, and a secondary coil. The first primary coil is parallely connected with the first resonant capacitor, and the first input end of the first primary coil is connected with the drain electrode of the first field effect transistor. The second input end of the first primary coil is connected with the positive output end of the rectification circuit. The grid of the first field effect transistor is used to receive a first square wave signal, and the source electrode of the first field effect transistor is grounded. The first output end and the second output end of the secondary coil are connected with the output circuit. The switch power supply converter is advantageous in that the duty ratio of the switch power supply converter is effectively controlled, and the converter works at an optimal duty ratio, and therefore the power supply works in an optimal efficiency range, and the conversion efficiency of the power supply is guaranteed.
Description
Technical field
The present invention relates to switch power technology field, particularly to a kind of switching power converters.
Background technology
Switching Power Supply key technology is risen China of the nineties is formal, Switching Power Supply have lightweight, volume is little, power
The feature that density is big, and be allowed to obtain spread and use；In terms of electrical property performance, there is the precision of voltage regulation high, dynamically special
Property good, the feature such as protection circuit is perfect, advantage maximum compared with linear power supply is to have good source effect characteristic, at wide electricity
Ensureing stable output in the input voltage range of pressure scope, linear power supply is because of the characteristic of Industrial Frequency Transformer securing loop ratio, only
Under conditions of specific input voltage and output load current, stable output voltage and operating characteristic can be kept, load
Dynamic characteristic cannot ensure completely, it is desirable to the dynamic characteristic index remaining good must design corresponding linear voltage-stabilizing circuit,
Causing circuit efficiency low eventually, electric energy is wasted in a large number.The comprehensive various advantage of above Switching Power Supply, Switching Power Supply starts to play more
Carry out the most important effect, and subsequently enter various electronics, electric equipment field, programme-controlled exchange, communication, electron detection device electricity
Source, control device power supply (DPS) etc. have been widely used direct-current switch power supply the most.
The appearance of Switching Power Supply also solves country variant and asks with area different the incompatible of the power supply caused of busbar voltage
Topic, as current charger for mobile phone and computer power can the input voltage ranges of compatible 85V to 265V, it is ensured that in the world
In the range of the Uniting of power supply adaptor and maintenance.
At present in field of power supplies for compatible 110V bus input voltage and 220V bus input voltage, the solution in Fig. 1
Scheme uses under major applications environment, and its switch S1 uses as 220V and 110V voltage switching, passes through during 220V input
Rectifier bridge carries out all wave rectification, and switch S1 position is thrown in 3 positions, and C1, C2 are the filter capacitor of series connection, defeated after all wave rectification
Go out about about 260V；During 110V input, switch S1 position is thrown in 1 position, and voltage forms multiplication of voltage through rectifier bridge D1 and C1, C2
Rectification circuit, the halfwave rectifier of C1, C2 entirely 110V completes, and the voltage after superposition is suitable with 220V full-wave rectified voltage, makes
Busbar voltage keeps relative stability, and completes the compatibility of ac bus.
In realizing process of the present invention, inventor finds that in prior art, at least there are the following problems:
When 110V inputs, electric capacity is in half-wave ballast state, and electric capacity charge cycle shortens, and discharge time is elongated, and ripple becomes
Greatly, in the case of heavy load, busbar voltage is unstable, when 220V inputs through all wave rectification C1, C2 series rectifier capacitance of D1
Reducing to the half of C1 and C2 capacity, filter effect declines, and power supply high direct voltage bus ripple increases, cause power output limited,
Electrical property declines.
Under the application scenarios that 1W-10W small-power power and efficiency requirements are the highest, normal shock or flyback sourse be can be used directly
Changer solves the compatibling problem of multiple voltage input.When the input application of ortho-exciting electric source changer width scope, due to input electricity
Pressure scope is relatively wide, causes the conversion ratio of dutycycle in gamut input voltage range bigger；Along with the reduction of input voltage,
The dutycycle of main circuit switch pipe can increase accordingly, magnetic saturation phenomenon the most easily occurs；And along with the rising of input voltage, main electricity
The dutycycle of way switch pipe can reduce accordingly, and now the efficiency of supply convertor can drastically decline, the voltage stress of switching tube, electricity
Stream stress, switching loss all can increase therewith, and reliability can not be guaranteed.
The information being disclosed in this background section is merely intended to increase the understanding of the general background to the present invention, and should not
When being considered to recognize or imply in any form this information structure prior art well known to persons skilled in the art.
Summary of the invention
It is an object of the invention to provide a kind of switching power converters, thus overcome existing switch power efficiency relatively low
Defect.
A kind of switching power converters that the embodiment of the present invention provides, including: rectification circuit, transformator, the first field effect
Pipe, the second field effect transistor, the first resonant capacitance, the second resonant capacitance, output circuit, the first resistance and the second resistance, transformator
Including the first primary coil, the second primary coil and secondary coil；
First primary coil and the first resonant capacitance are in parallel, and the first input end of the first primary coil and the first field effect
The drain electrode of pipe is connected, and the second input of the first primary coil is connected with the positive output end of rectification circuit；First field effect transistor
Grid is used for receiving the first square-wave signal, ground connection after the first resistance described in the source series of the first field effect transistor；
Second primary coil and the second resonant capacitance are in parallel, and the first input end of the second primary coil and the second field effect
The drain electrode of pipe is connected, and the second input of the second primary coil is connected with the positive output end of rectification circuit；Second field effect transistor
Grid is used for receiving the second square-wave signal, ground connection after the second resistance described in the source series of the second field effect transistor；
First outfan and second outfan of secondary coil are connected with output circuit, and the first outfan of secondary coil
For negative output terminal；The first input end of the first primary coil, the first input end of the second primary coil and the first of secondary coil
Outfan Same Name of Ends each other.
In a kind of possible implementation, the grid of the first field effect transistor and the grid of the second field effect transistor are selectively
By the two one of receive square-wave signal.
In a kind of possible implementation, this switching power converters also includes: side's wave generation circuit, and square wave occurs electricity
Road is for output the first square-wave signal or the second square-wave signal, and asynchronously exports the first square-wave signal and the second square-wave signal；
First outfan of side's wave generation circuit and the grid of the first field effect transistor are connected, for the first field effect transistor
Grid exports the first square-wave signal；The grid of side's the second outfan of wave generation circuit and the second field effect transistor is connected, for
The grid of the second field effect transistor exports the second square-wave signal.
In a kind of possible implementation, side's wave generation circuit includes: square-wave generator, two-way switch and periphery electricity
Road；Peripheral circuit is connected with square-wave generator, and the outfan of square-wave generator is connected with the input of two-way switch, two-way switch
The first outfan and the first field effect transistor grid be connected, the second outfan of two-way switch and the grid of the second field effect transistor
It is connected；
Peripheral circuit is used for acquisition state signal, and sends status signal to square-wave generator；Square-wave generator is used for
Produce corresponding square-wave signal according to status signal, and square-wave signal is sent to two-way switch.
In a kind of possible implementation, the first collection terminal of side's wave generation circuit and the source electrode phase of the first field effect transistor
Even, for gathering the first current signal；Second collection terminal of side's wave generation circuit and the source electrode of the second field effect transistor are connected, and are used for
Gather the second current signal；Side's feedback end of wave generation circuit is connected with the positive output end of output circuit, is used for gathering output electricity
Pressure；
Side's wave generation circuit adjusts the dutycycle of the first square-wave signal according to the first current signal and output voltage；And/or
Side's wave generation circuit adjusts the dutycycle of the second square-wave signal according to the second current signal and output voltage.
In a kind of possible implementation, when the grid of the first field effect transistor receives the first square-wave signal, switch electricity
The maximum of the dutycycle of source converter is less than 60%；When the grid of the second field effect transistor receives the second square-wave signal, open
Close the maximum of dutycycle of supply convertor less than 60%.
In a kind of possible implementation, rectification circuit includes rectifier bridge and the first filter capacitor；The input of rectifier bridge
End is used for receiving industrial-frequency alternating current, and the positive output end of rectifier bridge is the positive output end of rectification circuit, the negative output termination of rectifier bridge
Ground；One end of first filter capacitor is connected with the positive output end of rectifier bridge, and the other end is connected with the negative output terminal of rectifier bridge.
In a kind of possible implementation, output circuit includes: commutation diode, fly-wheel diode, filter inductance and
Second filter capacitor；The anode of commutation diode is connected with the second outfan of secondary coil, negative electrode and one end of filter inductance
It is connected；The other end of filter inductance is the positive output end of output circuit, and is connected with one end of the second filter capacitor, filter capacitor
Other end ground connection；The anode of fly-wheel diode is connected with the first outfan of secondary coil, negative electrode and the moon of commutation diode
The most connected.
In a kind of possible implementation, this switching power converters also includes: the first resistance and the second resistance；
Ground connection after source series first resistance of the first field effect transistor；After source series second resistance of the second field effect transistor
Ground connection.
In a kind of possible implementation, the value model of the turn ratio between the first primary coil and the second primary coil
Enclose for [1/3,2/3].
In a kind of possible implementation, the turn ratio between the first primary coil and the second primary coil is 1:2.
A kind of switching power converters that the embodiment of the present invention provides, the first primary coil and the second primary coil are mutual
Independent magnet exciting coil, forms ortho-exciting electric source changer with the first field effect transistor and the second field effect transistor respectively, passes through first party
Ripple signal and the second square-wave signal can effectively control the dutycycle of switching power converters so that accounting for of switching power converters
Empty ratio will not be excessive or too small, and supply convertor is operated in the position of efficiency optimization as far as possible, such that it is able to improve switch electricity
The whole efficiency of source converter.By many group magnet exciting coils achieve under two kinds even more multiple voltage level condition efficient
Conversion, can meet the requirement of more wide input voltage, it is possible to achieve at direct current 48V communication network, aircraft AC electrical 110V voltage simultaneously
Hierarchical network, household AC 220V input network, three-phase alternating current 380V electric pressure input gamut are compatible.This Switching Power Supply becomes
Parallel operation, in the case of not changing topology pattern and operation principle, by increasing one or more groups its magnet exciting coil, completes not
With the application under input voltage scene so that switching power converters is applicable to broader input voltage；At wide input voltage
In the case of select the magnet exciting coil that adapts, changer to always work at optimum dutycycle, it is ensured that power work is in optimum efficiency
In the range of, thus ensure the conversion efficiency of power supply.
Other features and advantages of the present invention will illustrate in the following description, and, partly become from description
Obtain it is clear that or understand by implementing the present invention.The purpose of the present invention and other advantages can be by the explanations write
Structure specifically noted in book, claims and accompanying drawing realizes and obtains.
Accompanying drawing explanation
Accompanying drawing is for providing a further understanding of the present invention, and constitutes a part for description, with the reality of the present invention
Execute example together for explaining the present invention, be not intended that limitation of the present invention.In the accompanying drawings:
Fig. 1 is the circuit diagram of prior art breaker in middle power supply；
Fig. 2 is the first circuit diagram of embodiment of the present invention breaker in middle supply convertor；
Fig. 3 is the second circuit figure of embodiment of the present invention breaker in middle supply convertor；
Fig. 4 is the circuit diagram of side's wave generation circuit in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings, the detailed description of the invention of the present invention is described in detail, it is to be understood that the guarantor of the present invention
Scope of protecting is not limited by detailed description of the invention.
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.Unless
Separately have other to explicitly indicate that, otherwise in entire disclosure and claims, term " include " or its conversion such as " comprising " or
" include " etc. and will be understood to comprise stated element or ingredient, and do not get rid of other element or other composition
Part.
According to embodiments of the present invention, it is provided that a kind of switching power converters, Fig. 2 is the structure of this switching power converters
Figure, specifically include: rectification circuit 10, transformator T1, the first field effect transistor Q1, the second field effect transistor Q2, the first resonant capacitance C3,
Second resonant capacitance C4, output circuit the 20, first resistance R3 and the second resistance R4.Wherein, transformator T1 includes the first primary line
Circle N1, the second primary coil N2 and secondary coil N3.Rectification circuit 10 is used for the AC rectification of input being stable direct current
Electricity, and export galvanic current by the positive output end Vin+ of rectification circuit.Output circuit 20 is for exporting secondary coil
Unidirectional current carry out voltage stabilizing and afterflow and process, so that switching power converters output galvanic current.
Concrete, the first primary coil N1 and the first resonant capacitance C3 is in parallel, and first input of the first primary coil N1
End is connected with the drain electrode of the first field effect transistor Q1, second input of the first primary coil N1 and the positive output end of rectification circuit 10
Vin+ is connected；The grid of the first field effect transistor Q1 is for receiving the first square-wave signal VG1, the source series of the first field effect transistor Q1
Ground connection after first resistance R3.
Second primary coil N2 and the second resonant capacitance C4 is in parallel, and the first input end and second of the second primary coil N2
The drain electrode of field effect transistor Q2 is connected, the positive output end Vin+ phase of second input of the second primary coil N2 and rectification circuit 10
Even；The grid of the second field effect transistor Q2 is for receiving the second square-wave signal VG2, and the source series second of the second field effect transistor Q2 is electric
Ground connection after resistance R4.First resistance R3 and the second resistance R4 is specially sampling resistor；Meanwhile, connect the first resistance R3 and the second resistance
R4, to protect corresponding ortho-exciting electric source changer, punctures field effect transistor when preventing electric current excessive.
First outfan and second outfan of secondary coil N3 are connected with output circuit 20 respectively, and secondary coil N3
First outfan is negative output terminal；Meanwhile, shown in Figure 2, the first input end of the first primary coil N1, the second primary coil
The first input end of N2 and the first outfan Same Name of Ends each other of secondary coil N3.
A kind of switching power converters that the embodiment of the present invention provides, the first primary coil and the second primary coil are mutual
Independent magnet exciting coil, forms ortho-exciting electric source changer with the first field effect transistor and the second field effect transistor respectively, passes through first party
Ripple signal and the second square-wave signal can effectively control the dutycycle of switching power converters so that accounting for of switching power converters
Empty ratio will not be excessive or too small, and supply convertor is operated in the position of efficiency optimization as far as possible, such that it is able to improve switch electricity
The whole efficiency of source converter.
In a kind of possible implementation, the grid of the first field effect transistor Q1 and the grid of the second field effect transistor Q2 are optional
Select by the two one of receive square-wave signal.Recipient's ripple letter when the i.e. first field effect transistor Q1 and the second field effect transistor Q2 difference
Number, work when the two is different in other words.It should be appreciated that selectively by the two one of receive square-wave signal can pass through
It is manually implemented that two-way switch is set, it is also possible to the switch automatically controlled by setting is realized, and this switch automatically controlled is by adopting
Set control signal (current signal etc. as in output voltage or loop) determines the direction of switch conduction.
Concrete, when the first field effect transistor Q1 receives the first square-wave signal, the second field effect transistor Q2 is closed,
I.e. second field effect transistor Q2 is not turned on；Accordingly, when the second field effect transistor Q2 receives the second square-wave signal, the first field effect transistor
Q1 is closed, and the i.e. first field effect transistor Q1 is not turned on.Meanwhile, in order to ensure the efficiency of switching power converters, when
When the grid of one field effect transistor Q1 receives the first square-wave signal, the maximum of the dutycycle of switching power converters is less than
60%；When the grid of the second field effect transistor Q2 receives the second square-wave signal, the maximum of the dutycycle of switching power converters
Less than 60%.Optionally, the maximum of dutycycle can be set to 50%.
Concrete, the number of turn of the first primary coil N1 is different from the number of turn of the second primary coil N2, sets according to practical situation
Putting turn ratio therebetween, the span of the turn ratio between the first primary coil N1 and the second primary coil N2 is [1/
3,2/3], i.e. between 1:3 and 2:3.Owing to domestic alternating current is 220V, external major part is 110V electric pressure, the two it
Between ratio be 1:2, therefore optionally, the turn ratio between the first primary coil N1 and the second primary coil N2 is 1:2 or 2:1.
As a example by the turn ratio between the first primary coil N1 and the second primary coil N2 is as 1:2, i.e. N1: N2=1:2, its
In, N1It is the number of turn of the first primary coil N1, N2It it is the number of turn of the second primary coil N2.
When input voltage is 220V electric pressure, Q1 is closed, and Q2 is controlled, the most now the second field effect transistor Q2
Receive the second square-wave signal；DC voltage after rectification circuit 10 filter rectification is about about 260V, this DC supply input
To the second primary coil N2, working method is unidirectional excitation, is now formed normal shock by the second primary coil N2 and secondary coil N3
Circuit topology, the dutycycle of switching power converters is D=Vo × N2/Vin×N3, wherein, Vo is the output electricity of secondary coil N3
Pressure, the input voltage of Vin the second primary coil N2.
Now, switching power converters can promote accordingly along with the increase efficiency of dutycycle, but encourages owing to magnetic core is unidirectional
The characteristic of magnetic, in switching tube the second field effect transistor Q2 down periods, the second resonant capacitance C4 carries out remanent magnetism reset, if dutycycle mistake
Big then easily cause magnetic saturation, therefore largest duty cycle is no more than 50%.But the active clamped topology pattern dutycycle of normal shock can root
Increasing according to practical situation, when being set in 220V ± 20% minimum point voltage 176V, the dutycycle of supply convertor is 50%,
So turn ratio K of its transformator T11=N2/N3It is certain value determined, and now switching power converters is operated in efficiency
Optimal curve position, it is ensured that product efficiency while, improve the product reliability of complete machine.
In like manner, when input voltage is 110V electric pressure, Q2 is closed, and Q1 is controlled, the most now first effect
The first square-wave signal should be received by pipe Q1；DC voltage after rectification circuit 10 rectifying and wave-filtering is about about 130V, its conduct
The DC input voitage of the first primary coil N1, because of turn ratio N of T1 transformator1: N2About=1:2, as in figure 2 it is shown, now by
N1, N3 composition forward converter topology, its dutycycle is D=Vo*N1/Vin*N3, input voltage vin is the second primary coil N2 work
Make the half of voltage, so when another turn ratio K of transformator T12=N1/N3、N1: N2During=1:2, K2=K1/2.Same, if
When being scheduled on 110V ± 20% minimum point voltage 88V, the value of dutycycle D is maintained at about 50%, thus ensure at input voltage be
During 110V electric pressure, switching power converters can also be operated in the position of efficiency optimization.
The switching power converters that the embodiment of the present invention provides, achieves at two kinds the most by many group magnet exciting coils
Plant the efficient conversion in the case of electric pressure, the requirement of more wide input voltage can be met, it is possible to achieve communicate at direct current 48V simultaneously
Network, aircraft AC electrical 110V electric pressure network, household AC 220V input network, the input of three-phase alternating current 380V electric pressure are entirely
Scope is compatible.Meanwhile, recipient's ripple signal when the first field effect transistor is different with the second field effect transistor, thus realize two excitations
The switching of coil.
In a kind of possible implementation, shown in Figure 3, rectification circuit 10 includes rectifier bridge D4 and the first filtered electrical
Hold C5；The input of rectifier bridge D4 is used for receiving industrial-frequency alternating current, and the positive output end of rectifier bridge D4 is just being rectification circuit 10
The negative output terminal ground connection of outfan Vin+, rectifier bridge D4.One end of first filter capacitor C5 and the positive output end phase of rectifier bridge D4
Even, the other end is connected with the negative output terminal of rectifier bridge D4.Rectifier bridge is for being unidirectional current by industrial frequency AC electric rectification, and first filters
Electric capacity, for being filtered the unidirectional current after rectification, obtains galvanic current.
Optionally, shown in Figure 3, output circuit 20 includes: commutation diode D2, sustained diode 3, filter inductance
L1 and the second filter capacitor C6.The anode of commutation diode D2 is connected with second outfan of secondary coil N3, negative electrode and filtering
One end of inductance L1 is connected；The other end of filter inductance L1 is the positive output end of output circuit 20, and with the second filter capacitor C6
One end be connected, the other end ground connection of the second filter capacitor C6；The anode of sustained diode 3 is defeated with the first of secondary coil N3
Going out end to be connected, negative electrode is connected with the negative electrode of commutation diode D2.When switching tube (the first field effect transistor Q1 or the second field effect transistor
Q2), during conducting, secondary coil N3 exports unidirectional current, now commutation diode D2 work, and the positive output end Vo of output circuit 20 is defeated
Go out unidirectional current；When switching tube turns off, transformator T1 does not transmit electric energy, now sustained diode 3, filter inductance L1 and second
Filter capacitor C6 forms continuous current circuit, to prevent device impaired.
In a kind of possible implementation, this switching power converters also includes: side's wave generation circuit, and square wave occurs electricity
Road is for output the first square-wave signal or the second square-wave signal, and asynchronously exports the first square-wave signal and the second square-wave signal；
I.e. side's wave generation circuit timesharing exports the first square-wave signal or the second square-wave signal.Concrete, the first of side's wave generation circuit is defeated
Go out end to be connected with the grid of the first field effect transistor Q1, for exporting the first square-wave signal to the grid of the first field effect transistor Q1；Side
Second outfan of wave generation circuit and the grid of the second field effect transistor Q2 are connected, for defeated to the grid of the second field effect transistor Q2
Go out the second square-wave signal.
In the embodiment of the present invention, square-wave generator is for producing the first square-wave signal or the second square-wave signal, and regulates the
One square-wave signal or the dutycycle of the second square-wave signal, thus control the work shape of the first field effect transistor or the second field effect transistor
State.Concrete, side's wave generation circuit includes: square-wave generator, two-way switch and peripheral circuit；Peripheral circuit and square-wave generator
Being connected, the outfan of square-wave generator is connected with the input of two-way switch, the first outfan of two-way switch and first effect
Should the grid of pipe be connected, the second outfan of two-way switch and the grid of the second field effect transistor are connected.Wherein, peripheral circuit is used for
Acquisition state signal, and status signal is sent to square-wave generator；Square-wave generator is corresponding for producing according to status signal
Square-wave signal, and by square-wave signal send to two-way switch.This status signal includes: flow through the first field effect transistor Q1 source electrode
The output electricity that first current signal, the second current signal flowing through the second field effect transistor Q2 source electrode and output circuit 20 are exported
Pressure；This square-wave signal is specially the first square-wave signal or the second square-wave signal.
Concrete, a kind of circuit diagram of square-wave generator is shown in Figure 4, wherein, and the first collection of side's wave generation circuit
The source electrode of end CS1 and the first field effect transistor Q1 is connected, for gathering the first current signal；Second collection terminal of side's wave generation circuit
The source electrode of CS2 and the second field effect transistor Q2 is connected, for gathering the second current signal；The feedback end of side's wave generation circuit and output
The positive output end Vo of circuit 20 is connected, and is used for gathering output voltage.Side's wave generation circuit is according to the first current signal and output electricity
Pressure adjusts the dutycycle of the first square-wave signal；And/or side's wave generation circuit adjusts the according to the second current signal and output voltage
The dutycycle of two square-wave signals.
Wherein, square-wave generator is the square wave generation chip IC 2 in Fig. 4, and two-way switch forms for switch S2, remaining circuit
This peripheral circuit, and peripheral circuit includes the first collection terminal CS1, the second collection terminal CS2 and feedback end.The output of square-wave generator
End Output exports the first square-wave signal or the second square-wave signal, and the input 2 of two-way switch S2 receives square-wave signal, and according to
The type of square-wave signal determine this square-wave signal be the first square-wave signal be still the second square-wave signal, and then conducting two-way switch
First outfan 1 or second outfan 3 of S2, selects an output square-wave signal；Can realize defeated by the two-way switch S2 in Fig. 4
Go out the first square-wave signal VG1 or the second square-wave signal VG2.Wherein, this two-way switch S2 can be manual toggle switch, it is possible to
Think the switch automatically controlled, according to input voltage, output voltage or other signals (as the first current signal or the second electric current are believed
Number etc.) determine the direction of switch conduction.
A kind of switching power converters that the embodiment of the present invention provides, the first primary coil and the second primary coil are mutual
Independent magnet exciting coil, forms ortho-exciting electric source changer with the first field effect transistor and the second field effect transistor respectively, passes through first party
Ripple signal and the second square-wave signal can effectively control the dutycycle of switching power converters so that accounting for of switching power converters
Empty ratio will not be excessive or too small, and supply convertor is operated in the position of efficiency optimization as far as possible, such that it is able to improve switch electricity
The whole efficiency of source converter.By many group magnet exciting coils achieve under two kinds even more multiple voltage level condition efficient
Conversion, can meet the requirement of more wide input voltage, it is possible to achieve at direct current 48V communication network, aircraft AC electrical 110V voltage simultaneously
Hierarchical network, household AC 220V input network, three-phase alternating current 380V electric pressure input gamut are compatible.This Switching Power Supply becomes
Parallel operation, in the case of not changing topology pattern and operation principle, by increasing one or more groups its magnet exciting coil, completes not
With the application under input voltage scene so that switching power converters is applicable to broader input voltage；At wide input voltage
In the case of select the magnet exciting coil that adapts, changer to always work at optimum dutycycle, it is ensured that power work is in optimum efficiency
In the range of, thus ensure the conversion efficiency of power supply.
Device embodiment described above is only schematically, and the wherein said unit illustrated as separating component can
To be or to may not be physically separate, the parts shown as unit can be or may not be physics list
Unit, i.e. may be located at a place, or can also be distributed on multiple NE.Can be selected it according to the actual needs
In some or all of module realize the purpose of the present embodiment scheme.Those of ordinary skill in the art are not paying creativeness
Work in the case of, be i.e. appreciated that and implement.
Through the above description of the embodiments, those skilled in the art it can be understood that to each embodiment can
The mode adding required general hardware platform by software realizes, naturally it is also possible to pass through hardware.Based on such understanding, on
State the part that prior art contributes by technical scheme the most in other words to embody with the form of software product, should
Computer software product can store in a computer-readable storage medium, such as ROM/RAM, magnetic disc, CD etc., including some fingers
Make with so that a computer equipment (can be personal computer, server, or the network equipment etc.) performs each and implements
The method described in some part of example or embodiment.
The aforementioned description to the specific illustrative embodiment of the present invention illustrates that and the purpose of illustration.These describe
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to above-mentioned teaching, can much change
And change.The purpose selected exemplary embodiment and describe is to explain that the certain principles of the present invention and reality thereof should
With so that those skilled in the art be capable of and utilize the present invention various different exemplary and
Various different selections and change.The scope of the present invention is intended to be limited by claims and equivalents thereof.
Claims (10)
1. a switching power converters, it is characterised in that including: rectification circuit, transformator, the first field effect transistor, second
Effect pipe, the first resonant capacitance, the second resonant capacitance, output circuit, the first resistance and the second resistance, described transformator includes
One primary coil, the second primary coil and secondary coil；
Described first primary coil is in parallel with described first resonant capacitance, and the first input end of described first primary coil and institute
The drain electrode stating the first field effect transistor is connected, the second input of described first primary coil and the positive output end of described rectification circuit
It is connected；The grid of described first field effect transistor is for receiving the first square-wave signal, the source series institute of described first field effect transistor
State ground connection after the first resistance；
Described second primary coil is in parallel with described second resonant capacitance, and the first input end of described second primary coil and institute
The drain electrode stating the second field effect transistor is connected, the second input of described second primary coil and the positive output end of described rectification circuit
It is connected；The grid of described second field effect transistor is for receiving the second square-wave signal, the source series institute of described second field effect transistor
State ground connection after the second resistance；
First outfan and second outfan of described secondary coil are connected with described output circuit, and the of described secondary coil
One outfan is negative output terminal；The first input end of described first primary coil, the first input end of described second primary coil
The first outfan Same Name of Ends each other with described secondary coil.
Switching power converters the most according to claim 1, it is characterised in that the grid of described first field effect transistor and institute
State the grid of the second field effect transistor selectively by the two one of receive square-wave signal.
Switching power converters the most according to claim 2, it is characterised in that also include: side's wave generation circuit, described side
Wave generation circuit is for output the first square-wave signal or the second square-wave signal, and asynchronously exports the first square-wave signal and second party
Ripple signal；
First outfan of described side's wave generation circuit is connected with the grid of described first field effect transistor, for described first
The grid of effect pipe exports the first square-wave signal；Second outfan of described side's wave generation circuit and described second field effect transistor
Grid is connected, for exporting the second square-wave signal to the grid of described second field effect transistor.
Switching power converters the most according to claim 3, it is characterised in that described side's wave generation circuit includes: square wave
Generator, two-way switch and peripheral circuit；Described peripheral circuit is connected with described square-wave generator, described square-wave generator defeated
Go out end to be connected with the input of described two-way switch, the first outfan of described two-way switch and the grid of described first field effect transistor
The most connected, the second outfan of described two-way switch is connected with the grid of described second field effect transistor；
Described peripheral circuit is used for acquisition state signal, and sends described status signal to described square-wave generator；Described side
Wave producer is for producing corresponding square-wave signal according to described status signal, and sends square-wave signal to two-way switch.
Switching power converters the most according to claim 3, it is characterised in that the first collection of described side's wave generation circuit
End is connected with the source electrode of described first field effect transistor, for gathering the first current signal；The second of described side's wave generation circuit is adopted
Collection end is connected with the source electrode of described second field effect transistor, for gathering the second current signal；The feedback of described side's wave generation circuit
End is connected with the positive output end of described output circuit, is used for gathering output voltage；
Described side's wave generation circuit adjusts the duty of the first square-wave signal according to described first current signal and described output voltage
Ratio；And/or described side's wave generation circuit adjusts the second square-wave signal according to described second current signal and described output voltage
Dutycycle.
Switching power converters the most according to claim 2, it is characterised in that when the grid of described first field effect transistor connects
When receiving the first square-wave signal, the maximum of the dutycycle of described switching power converters is less than 60%；
When the grid of described second field effect transistor receives the second square-wave signal, the dutycycle of described switching power converters is
Big value is less than 60%.
Switching power converters the most according to claim 1, it is characterised in that described rectification circuit includes rectifier bridge and
One filter capacitor；
The input of described rectifier bridge is used for receiving industrial-frequency alternating current, and the positive output end of described rectifier bridge is described rectification circuit
Positive output end, the negative output terminal ground connection of described rectifier bridge；
One end of described first filter capacitor is connected with the positive output end of described rectifier bridge, and the other end is negative defeated with described rectifier bridge
Go out end to be connected.
Switching power converters the most according to claim 1, it is characterised in that described output circuit includes: rectification two pole
Pipe, fly-wheel diode, filter inductance and the second filter capacitor；
The anode of described commutation diode is connected with the second outfan of described secondary coil, negative electrode and the one of described filter inductance
End is connected；The other end of described filter inductance is the positive output end of described output circuit, and with the one of described second filter capacitor
End is connected, the other end ground connection of described filter capacitor；
The anode of described fly-wheel diode is connected with the first outfan of described secondary coil, negative electrode and described commutation diode
Negative electrode is connected.
Switching power converters the most according to claim 1, it is characterised in that described first primary coil and described second
The span of the turn ratio between primary coil is [1/3,2/3].
Switching power converters the most according to claim 9, it is characterised in that described first primary coil and described the
Turn ratio between two primary coils is 1:2.
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| CN201610821269.5A CN106329939B (en) | 2016-09-13 | 2016-09-13 | A kind of switching power converters |
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| CN201610821269.5A CN106329939B (en) | 2016-09-13 | 2016-09-13 | A kind of switching power converters |
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| CN106329939B CN106329939B (en) | 2019-06-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112290803A (en) * | 2020-11-10 | 2021-01-29 | 格力博(江苏)股份有限公司 | Switch power supply capacity expansion circuit |
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| CN106329939B (en) | 2019-06-25 |
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