CN106329939B - A kind of switching power converters - Google Patents
A kind of switching power converters Download PDFInfo
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- CN106329939B CN106329939B CN201610821269.5A CN201610821269A CN106329939B CN 106329939 B CN106329939 B CN 106329939B CN 201610821269 A CN201610821269 A CN 201610821269A CN 106329939 B CN106329939 B CN 106329939B
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- 230000005669 field effect Effects 0.000 claims abstract description 89
- 239000003990 capacitor Substances 0.000 claims description 19
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 5
- 238000012546 transfer Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 230000002459 sustained effect Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001550 time effect Effects 0.000 description 1
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
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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
Abstract
The invention discloses a kind of switching power converters, it include: rectification circuit, transformer, the first field-effect tube, the second field-effect tube, the first resonant capacitance, the second resonant capacitance, output circuit, first resistor and second resistance, transformer includes the first primary coil, the second primary coil and secondary coil；First primary coil is in parallel with the first resonant capacitance, and the first input end of the first primary coil is connected with the drain electrode of the first field-effect tube, and the second input terminal of the first primary coil is connected with the positive output end of rectification circuit；The grid of first field-effect tube is for receiving the first square-wave signal, the source electrode ground connection of the first field-effect tube；The first output end and second output terminal of secondary coil are connected with output circuit.The switching power converters can the duty ratio of effectively control switch supply convertor guarantee power work within the scope of optimum efficiency, to guarantee the transfer efficiency of power supply so that converter always works at optimal duty ratio.
Description
Technical field
The present invention relates to switch power technology field, in particular to a kind of switching power converters.
Background technique
China formal rise of the Switching Power Supply key technology in the nineties, Switching Power Supply have light-weight, small in size, power
The big feature of density, and be allowed to be promoted the use of a large area；In terms of electrical property performance, have the precision of voltage regulation high, dynamic is special
Property good, protection circuit the features such as improving, maximum advantage is that have good source effect characteristic with linear power supply compared with, wide electric
Press and guarantee stable output in the input voltage range of range, linear power supply because Industrial Frequency Transformer securing loop ratio characteristic, only
Under conditions of specific input voltage and output load current, stable output voltage and working characteristics can be kept, is loaded
Dynamic characteristic not can guarantee completely, it is desirable to maintain good dynamic characteristic index that must design corresponding linear voltage-stabilizing circuit, most
Cause circuit efficiency low eventually, electric energy largely wastes.In summary the various advantages of Switching Power Supply, Switching Power Supply start to play more
Carry out more important role, and subsequently enters various electronics, electrical equipment field, programme-controlled exchange, communication, electron detection device electricity
Direct-current switch power supply has all been widely used in source, control equipment power supply etc..
The appearance of Switching Power Supply also solve country variant it is different with regional busbar voltage caused by the incompatible of power supply ask
Topic, such as current phone charger and computer power can be compatible with the input voltage range of 85V to 265V, guarantee in the world
The Uniting of power supply adaptor in range and maintenance.
Solution in field of power supplies in order to be compatible with 110V bus input voltage and 220V bus input voltage, in Fig. 1 at present
Scheme uses under major applications environment, and switch S1 switches as 220V and 110V voltage to be used, and 220V passes through when inputting
Rectifier bridge carries out full-wave rectification, and switch S1 is thrown position in 3 positions, and C1, C2 are concatenated filter capacitor, defeated after full-wave rectification
It is out about 260V or so；The position switch S1 is thrown in 1 position when 110V is inputted, and voltage forms multiplication of voltage by rectifier bridge D1 and C1, C2
Rectification circuit, C1, C2 are entirely that the halfwave rectifier of 110V is completed, and superimposed voltage 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, at least there are the following problems in the prior art for inventor's discovery:
When 110V input, capacitor is in half-wave ballast state, and the capacitor charging period shortens, and discharge time is elongated, and ripple becomes
Greatly, busbar voltage is unstable in the case of heavy load, when 220V input by full-wave rectification C1, C2 series rectifier capacitance of D1
It is reduced to the half of C1 and C2 capacity, filter effect decline, power supply high direct voltage bus ripple increases, power output is caused to be limited,
Electrical property decline.
Under the not high application scenarios of 1W-10W small-power power and efficiency requirements, normal shock or flyback sourse can be used directly
Converter solves the compatibling problem of multiple voltage input.It is inputted in ortho-exciting electric source converter wide scope in application, due to input electricity
It presses range wider, causes the transformation of the duty ratio in gamut input voltage range bigger；With the reduction of input voltage,
The duty ratio of main circuit switch pipe can be increase accordingly, and easily occur magnetic saturation phenomenon at this time；And with the raising of input voltage, main electricity
The duty ratio of way switch pipe can be reduced accordingly, and the efficiency of supply convertor can sharply decline at this time, voltage stress, the electricity of switching tube
Stream stress, switching loss can all increase with it, and reliability cannot be guaranteed.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering
When being considered as recognizing or imply that the information constitutes the prior art already known to those of ordinary skill in the art in any form.
Summary of the invention
The purpose of the present invention is to provide a kind of switching power converters, to overcome existing switch power efficiency lower
Defect.
A kind of switching power converters provided in an embodiment of the present invention, comprising: rectification circuit, transformer, the first field-effect
Pipe, the second field-effect tube, the first resonant capacitance, the second resonant capacitance, output circuit, first resistor and second resistance, transformer
Including the first primary coil, the second primary coil and secondary coil；
First primary coil is in parallel with the first resonant capacitance, 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 terminal of the first primary coil is connected with the positive output end of rectification circuit；First field-effect tube
Grid is grounded after first resistor described in the source series of the first field-effect tube for receiving the first square-wave signal；
Second primary coil is in parallel with the second resonant capacitance, 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 terminal of the second primary coil is connected with the positive output end of rectification circuit；Second field-effect tube
Grid is grounded after second resistance described in the source series of the second field-effect tube for receiving the second square-wave signal；
The first output end and second output terminal of secondary coil are connected with output circuit, and the first output end of secondary coil
For negative output terminal；The first of the first input end of first primary coil, the first input end of the second primary coil and secondary coil
Output end Same Name of Ends each other.
In one possible implementation, the grid of the first field-effect tube and the grid of the second field-effect tube be selectively
Square-wave signal is received by one of the two.
In one possible implementation, switching power converters further include: electricity occurs for square wave generation circuit, square wave
Road does not export the first square-wave signal and the second square-wave signal for exporting the first square-wave signal or the second square-wave signal simultaneously；
First output end of square wave generation circuit is connected with the grid of the first field-effect tube, for the first field-effect tube
Grid exports the first square-wave signal；The second output terminal of square wave generation circuit is connected with the grid of the second field-effect tube, for
The grid of second field-effect tube exports the second square-wave signal.
In one possible implementation, square wave generation circuit includes: square-wave generator, two-way switch and periphery electricity
Road；Peripheral circuit is connected with square-wave generator, and the output end of square-wave generator is connected with the input terminal of two-way switch, two-way switch
The first output end be connected with the grid of the first field-effect tube, the grid of the second output terminal of two-way switch and the second field-effect tube
It is connected；
Peripheral circuit is used for acquisition state signal, and status signal is sent to square-wave generator；Square-wave generator is used for
Corresponding square-wave signal is generated according to status signal, and square-wave signal is sent to two-way switch.
In one possible implementation, the source electrode phase of the first collection terminal of square wave generation circuit and the first field-effect tube
Even, for acquiring the first current signal；Second collection terminal of square wave generation circuit is connected with the source electrode of the second field-effect tube, is used for
Acquire the second current signal；The feedback end of square wave generation circuit is connected with the positive output end of output circuit, for acquiring output electricity
Pressure；
Square wave generation circuit adjusts the duty ratio of the first square-wave signal according to the first current signal and output voltage；And/or
Square wave generation circuit adjusts the duty ratio of the second square-wave signal according to the second current signal and output voltage.
In one possible implementation, when the grid of the first field-effect tube receives the first square-wave signal, switch electricity
The maximum value of the duty ratio of source converter is no more than 60%；When the grid of the second field-effect tube receives the second square-wave signal, open
The maximum value of the duty ratio of powered-down source converter is no more than 60%.
In one possible implementation, rectification circuit includes rectifier bridge and the first filter capacitor；The input of rectifier bridge
End is the positive output end of rectification circuit, the negative output termination of rectifier bridge for receiving industrial-frequency alternating current, the positive output end 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 one possible implementation, output circuit include: rectifier diode, freewheeling diode, filter inductance and
Second filter capacitor；The anode of rectifier diode is connected with the second output terminal of secondary coil, one end of cathode and 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
The other end ground connection；The anode of freewheeling diode is connected with the first output end of secondary coil, the yin of cathode and rectifier diode
Extremely it is connected.
In one possible implementation, switching power converters further include: first resistor and second resistance；
It is grounded after the source series first resistor of first field-effect tube；After the source series second resistance of second field-effect tube
Ground connection.
In one possible implementation, the value model of the turn ratio between the first primary coil and the second primary coil
It encloses for [1/3,2/3].
In one possible implementation, the turn ratio between the first primary coil and the second primary coil is 1:2.
A kind of switching power converters provided in an embodiment of the present invention, the first primary coil and the second primary coil are mutual
Independent magnet exciting coil forms ortho-exciting electric source converter with the first field-effect tube and the second field-effect tube respectively, passes through first party
Wave signal and the second square-wave signal can effective control switch supply convertor duty ratio so that switching power converters account for
Than not too big or too small, supply convertor works at the position of efficiency optimization sky as far as possible, so as to improve switch electricity
The whole efficiency of source converter.It is realized by multiple groups magnet exciting coil efficient in two kinds of even more a variety of voltage class
Conversion, while it being able to satisfy the requirement of more wide input voltage, it may be implemented in direct current 48V communication network, aircraft AC electrical 110V voltage
Hierarchical network, household AC 220V input network, three-phase alternating current 380V voltage class input gamut are compatible.The Switching Power Supply becomes
Parallel operation, by increasing its one or more groups of magnet exciting coil, is completed or not changing topological pattern and working principle
With the application under input voltage scene, so that switching power converters are suitable for broader input voltage；In wide input voltage
In the case of select adaptable magnet exciting coil, converter always works at optimal duty ratio, guarantees power work in optimum efficiency
In range, to guarantee the transfer efficiency of power supply.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by written explanation
Specifically noted structure is achieved and obtained in book, claims and attached drawing.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the circuit diagram of Switching Power Supply in the prior art；
Fig. 2 is the first circuit diagram of switching power converters in the embodiment of the present invention；
Fig. 3 is the second circuit figure of switching power converters in the embodiment of the present invention；
Fig. 4 is the circuit diagram of square wave generation circuit in the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in detail, it is to be understood that guarantor of the invention
Shield range is not limited by the specific implementation.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.Unless
Separately have it is other explicitly indicate that, otherwise in entire disclosure and claims, term " includes " or its transformation such as "comprising" or
" including " etc. will be understood to comprise stated element or component, and not exclude other elements or other compositions
Part.
According to embodiments of the present invention, a kind of switching power converters are provided, Fig. 2 is the structure of the switching power converters
Figure, specifically include: rectification circuit 10, transformer T1, the first field-effect tube Q1, the second field-effect tube Q2, the first resonant capacitance C3,
Second resonant capacitance C4, output circuit 20, first resistor R3 and second resistance R4.Wherein, transformer T1 includes the first primary line
Enclose N1, the second primary coil N2 and secondary coil N3.The AC rectification that rectification circuit 10 is used to input is stable direct current
Electricity, and stable DC is exported by the positive output end Vin+ of rectification circuit.Output circuit 20 is used to export secondary coil
Direct current carry out pressure stabilizing and afterflow processing so that switching power converters export stable DC.
Specifically, the first primary coil N1 is in parallel with the first resonant capacitance C3, and the first input of the first primary coil N1
End is connected with the drain electrode of the first field-effect tube Q1, the second input terminal of the first primary coil N1 and the positive output end of rectification circuit 10
Vin+ is connected；The grid of first field-effect tube Q1 is for receiving the first square-wave signal VG1, the source series of the first field-effect tube Q1
It is grounded after first resistor R3.
Second primary coil N2 is in parallel with the second resonant capacitance C4, and the first input end and second of the second primary coil N2
The drain electrode of field-effect tube Q2 is connected, the positive output end Vin+ phase of the second input terminal and rectification circuit 10 of the second primary coil N2
Even；The grid of second field-effect tube Q2 is used to receive the second electricity of source series of the second square-wave signal VG2, the second field-effect tube Q2
It is grounded after resistance R4.First resistor R3 and second resistance R4 is specially sampling resistor；Meanwhile connect first resistor R3 and second resistance
R4 prevents from puncturing field-effect tube when electric current is excessive to protect corresponding ortho-exciting electric source converter.
The first output end and second output terminal of secondary coil N3 is connected with output circuit 20 respectively, and secondary coil N3
First output end is negative output terminal；Meanwhile shown in Figure 2, first input end, the second primary coil of the first primary coil N1
The first output end of the first input end of N2 and secondary coil N3 Same Name of Ends each other.
A kind of switching power converters provided in an embodiment of the present invention, the first primary coil and the second primary coil are mutual
Independent magnet exciting coil forms ortho-exciting electric source converter with the first field-effect tube and the second field-effect tube respectively, passes through first party
Wave signal and the second square-wave signal can effective control switch supply convertor duty ratio so that switching power converters account for
Than not too big or too small, supply convertor works at the position of efficiency optimization sky as far as possible, so as to improve switch electricity
The whole efficiency of source converter.
In one possible implementation, the grid of the grid of the first field-effect tube Q1 and the second field-effect tube Q2 are optional
Square-wave signal is received by one of the two with selecting.That is the first field-effect tube Q1 and recipient's wave is believed when the second field-effect tube Q2 difference
Number, the two does not work at the same time in other words.It should be understood that selectively receiving square-wave signal by one of the two can pass through
Setting two-way switch is manually implemented, and the switch that can also be automatically controlled by setting realizes that the switch of the automatic control is by adopting
Set control signal (current signal in such as output voltage or circuit) determines the direction of switch conduction.
Specifically, the second field-effect tube Q2 is in close state when the first field-effect tube Q1 receives the first square-wave signal,
I.e. the second field-effect tube Q2 is not turned on；Correspondingly, when the second field-effect tube Q2 receives the second square-wave signal, the first field-effect tube
Q1 is in close state, i.e., the first field-effect tube Q1 is not turned on.Meanwhile the efficiency in order to guarantee switching power converters, when
When the grid of one field-effect tube Q1 receives the first square-wave signal, the maximum value of the duty ratio of switching power converters is no more than
60%；When the grid of the second field-effect tube Q2 receives the second square-wave signal, the maximum value of the duty ratio of switching power converters
No more than 60%.Optionally, the maximum value of duty ratio can be set to 50%.
Specifically, the number of turns of the first primary coil N1 is different from the number of turns of the second primary coil N2, set according to the actual situation
Turn ratio between the two is set, the value range 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.Since domestic alternating current is 220V, external most of is 110V voltage class, the two it
Between ratio be 1:2, therefore optional, the turn ratio between the first primary coil N1 and the second primary coil N2 is 1:2 or 2:1.
By taking the turn ratio between the first primary coil N1 and the second primary coil N2 is 1:2 as an example, i.e. N1: N2=1:2,
In, N1For the number of turns of the first primary coil N1, N2For the number of turns of the second primary coil N2.
When input voltage is 220V voltage class, Q1 is in close state, and Q2 is controlled, i.e., the second field-effect tube Q2 at this time
Receive the second square-wave signal；DC voltage after 10 filter rectification of rectification circuit is about 260V or so, the DC supply input
To the second primary coil N2, working method is unidirectional excitation, forms normal shock by the second primary coil N2 and secondary coil N3 at this time
Circuit topology, the duty ratio of switching power converters are D=Vo × N2/Vin×N3, wherein the output electricity that Vo is secondary coil N3
Pressure, the input voltage of the second primary coil of Vin N2.
At this point, switching power converters can be promoted accordingly with the increase efficiency of duty ratio, but since magnetic core is unidirectionally encouraged
The characteristic of magnetic, in switching tube the second field-effect tube Q2 down periods, the second resonant capacitance C4 carries out remanent magnetism reset, if duty ratio mistake
It is big then easily cause magnetic saturation, therefore largest duty cycle is no more than 50%.But the active clamped topological pattern duty ratio of normal shock can root
Being increased according to actual conditions, the duty ratio of supply convertor is 50% when being set in ± 20% minimum point voltage 176V of 220V,
So turn ratio K of its transformer T11=N2/N3As some value determined, and switching power converters work at this time is in efficiency
Optimal curve position, while the product efficiency of guarantee, improve the product reliability of complete machine.
Similarly, when input voltage is 110V voltage class, Q2 is in close state, and Q1 is controlled, i.e., first at this time effect
It should pipe Q1 the first square-wave signal of reception；DC voltage after 10 rectifying and wave-filtering of rectification circuit is about 130V or so, conduct
The DC input voitage of first primary coil N1, because of the turn ratio N of T1 transformer1: N2=1:2 or so, as shown in Fig. 2, at this time by
N1, N3 form forward converter topology, duty ratio D=Vo*N1/Vin*N3, input voltage vin is the second primary coil N2 work
Make the half of voltage, so working as another turn ratio K of transformer T12=N1/N3、N1: N2When=1:2, K2=K1/2.Likewise, setting
When being scheduled on ± 20% minimum point voltage 88V of 110V, the value of duty ratio D is maintained at 50% or so, thus guarantee be in input voltage
Switching power converters can also work in the position of efficiency optimization when 110V voltage class.
Switching power converters provided in an embodiment of the present invention are realized even more at two kinds by multiple groups magnet exciting coil
Efficient conversion in the case of kind voltage class, while it being able to satisfy the requirement of more wide input voltage, it may be implemented to communicate in direct current 48V
Network, aircraft AC electrical 110V voltage class network, household AC 220V input network, the input of three-phase alternating current 380V voltage class are complete
Range is compatible.Meanwhile first field-effect tube and recipient's wave signal when the second field-effect tube difference, to realize to two excitations
The switching of coil.
In one possible implementation, shown in Figure 3, rectification circuit 10 includes rectifier bridge D4 and the first filtered electrical
Hold C5；The input terminal of rectifier bridge D4 for receiving industrial-frequency alternating current, the positive output end of rectifier bridge D4 be rectification circuit 10 just
The negative output terminal of output end Vin+, rectifier bridge D4 are grounded.The positive output end phase of one end of the first filter capacitor C5 and rectifier bridge D4
Even, the other end is connected with the negative output terminal of rectifier bridge D4.Rectifier bridge is used to for industrial-frequency alternating current being rectified into direct current, the first filtering
Capacitor obtains stable DC for being filtered to the direct current after rectification.
Optionally, shown in Figure 3, output circuit 20 includes: rectifier diode D2, sustained diode 3, filter inductance
L1 and the second filter capacitor C6.The anode of rectifier diode D2 is connected with the second output terminal of secondary coil N3, cathode and filtering
One end of inductance L1 is connected；The other end of filter inductance L1 be output circuit 20 positive output end, and with the second filter capacitor C6
One end be connected, the other end of the second filter capacitor C6 ground connection；The first of the anode of sustained diode 3 and secondary coil N3 is defeated
Outlet is connected, and cathode is connected with the cathode of rectifier diode D2.When switching tube (the first field-effect tube Q1 or the second field-effect tube
When Q2) being connected, secondary coil N3 exports direct current, and rectifier diode D2 works at this time, and the positive output end Vo of output circuit 20 is defeated
Direct current out；When switching tube shutdown, transformer T1 does not transmit electric energy, at this time sustained diode 3, filter inductance L1 and second
Filter capacitor C6 forms continuous current circuit, to prevent device impaired.
In one possible implementation, switching power converters further include: electricity occurs for square wave generation circuit, square wave
Road does not export the first square-wave signal and the second square-wave signal for exporting the first square-wave signal or the second square-wave signal simultaneously；
I.e. square wave generation circuit timesharing exports the first square-wave signal or the second square-wave signal.Specifically, the first of square wave generation circuit is defeated
Outlet is connected with the grid of the first field-effect tube Q1, for exporting the first square-wave signal to the grid of the first field-effect tube Q1；Side
The second output terminal of wave generation circuit is connected with the grid of the second field-effect tube Q2, defeated for the grid to the second field-effect tube Q2
Second square-wave signal out.
In the embodiment of the present invention, square-wave generator adjusts for generating the first square-wave signal or the second square-wave signal
The duty ratio of one square-wave signal or the second square-wave signal, thus the work shape of the first field-effect tube of control or the second field-effect tube
State.Specifically, square wave generation circuit includes: square-wave generator, two-way switch and peripheral circuit；Peripheral circuit and square-wave generator
It is connected, the output end of square-wave generator is connected with the input terminal of two-way switch, the first output end of two-way switch and first effect
Should pipe grid be connected, the second output terminal of two-way switch is connected with the grid of the second field-effect tube.Wherein, peripheral circuit is used for
Acquisition state signal, and status signal is sent to square-wave generator；Square-wave generator is used to be generated according to status signal corresponding
Square-wave signal, and square-wave signal is sent to two-way switch.The status signal includes: to flow through the first field-effect tube Q1 source electrode
The output electricity that first current signal, the second current signal for flowing through the second field-effect tube Q2 source electrode and output circuit 20 are exported
Pressure；The square-wave signal is specially the first square-wave signal or the second square-wave signal.
Specifically, a kind of circuit diagram of square-wave generator is shown in Figure 4, wherein the first acquisition of square wave generation circuit
End CS1 is connected with the source electrode of the first field-effect tube Q1, for acquiring the first current signal；Second collection terminal of square wave generation circuit
CS2 is connected with the source electrode of the second field-effect tube Q2, for acquiring the second current signal；The feedback end of square wave generation circuit and output
The positive output end Vo of circuit 20 is connected, for acquiring output voltage.Square wave generation circuit is according to the first current signal and output electricity
The duty ratio of pressure the first square-wave signal of adjustment；And/or square wave generation circuit is according to the second current signal and output voltage adjustment the
The duty ratio of two square-wave signals.
Wherein, square-wave generator is that chip IC 2 occurs for the square wave in Fig. 4, and two-way switch is switch S2, remaining circuit composition
The 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 the first square-wave signal of output or the second square-wave signal, the reception square-wave signal of input terminal 2 of two-way switch S2, and according to
The type of square-wave signal determines that the square-wave signal be the first square-wave signal is still the second square-wave signal, and then two-way switch is connected
The first output end 1 or second output terminal 3 of S2, selects an output square-wave signal；It may be implemented by the two-way switch S2 in Fig. 4 defeated
First square-wave signal VG1 or the second square-wave signal VG2 out.Wherein, two-way switch S2 can be manually toggle switch, can also
The switch for thinking automatic control, according to input voltage, output voltage or other signals, (such 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 provided in an embodiment of the present invention, the first primary coil and the second primary coil are mutual
Independent magnet exciting coil forms ortho-exciting electric source converter with the first field-effect tube and the second field-effect tube respectively, passes through first party
Wave signal and the second square-wave signal can effective control switch supply convertor duty ratio so that switching power converters account for
Than not too big or too small, supply convertor works at the position of efficiency optimization sky as far as possible, so as to improve switch electricity
The whole efficiency of source converter.It is realized by multiple groups magnet exciting coil efficient in two kinds of even more a variety of voltage class
Conversion, while it being able to satisfy the requirement of more wide input voltage, it may be implemented in direct current 48V communication network, aircraft AC electrical 110V voltage
Hierarchical network, household AC 220V input network, three-phase alternating current 380V voltage class input gamut are compatible.The Switching Power Supply becomes
Parallel operation, by increasing its one or more groups of magnet exciting coil, is completed or not changing topological pattern and working principle
With the application under input voltage scene, so that switching power converters are suitable for broader input voltage；In wide input voltage
In the case of select adaptable magnet exciting coil, converter always works at optimal duty ratio, guarantees power work in optimum efficiency
In range, to guarantee the transfer efficiency of power supply.
The apparatus embodiments described above are merely exemplary, wherein described, unit can as illustrated by the separation member
It is physically separated with being or may not be, component shown as a unit may or may not be physics list
Member, it can it is in one place, or may be distributed over multiple network units.It can be selected according to the actual needs
In some or all of the modules achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creativeness
Labour in the case where, it can understand and implement.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
It realizes by means of software and necessary general hardware platform, naturally it is also possible to pass through hardware.Based on this understanding, on
Stating technical solution, substantially the part that contributes to existing technology can be embodied in the form of software products in other words, should
Computer software product may be stored in a computer readable storage medium, such as ROM/RAM, magnetic disk, CD, including several fingers
It enables and using so that a computer equipment (can be personal computer, server or the network equipment etc.) executes each implementation
Method described in certain parts of example or embodiment.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (9)
1. a kind of switching power converters characterized by comprising rectification circuit, transformer, the first field-effect tube, second
Effect pipe, the first resonant capacitance, the second resonant capacitance, output circuit, first resistor and second resistance, the transformer include the
One primary coil, the second primary coil and secondary coil；
First primary coil is in parallel with first resonant capacitance, and the first input end of first primary coil and institute
The drain electrode for stating the first field-effect tube is connected, the second input terminal of first primary coil and the positive output end of the rectification circuit
It is connected；The grid of first field-effect tube is for receiving the first square-wave signal, the source series institute of first field-effect tube
It is grounded after stating first resistor；
Second primary coil is in parallel with second resonant capacitance, and the first input end of second primary coil and institute
The drain electrode for stating the second field-effect tube is connected, the second input terminal of second primary coil and the positive output end of the rectification circuit
It is connected；The grid of second field-effect tube is for receiving the second square-wave signal, the source series institute of second field-effect tube
It is grounded after stating second resistance；
The first output end and second output terminal of the secondary coil are connected with the output circuit, and the of the secondary coil
One output end is negative output terminal；The first input end of the first input end of first primary coil, second primary coil
With the first output end of secondary coil Same Name of Ends each other
The grid of first field-effect tube and the grid of second field-effect tube are selectively by one of the two recipient
Wave signal.
2. switching power converters according to claim 1, which is characterized in that further include: square wave generation circuit, the side
Wave generation circuit does not export the first square-wave signal and second party for exporting the first square-wave signal or the second square-wave signal simultaneously
Wave signal；
First output end of side's wave generation circuit is connected with the grid of first field-effect tube, for described first
The grid of effect pipe exports the first square-wave signal；The second output terminal of side's wave generation circuit and second field-effect tube
Grid is connected, for exporting the second square-wave signal to the grid of second field-effect tube.
3. switching power converters according to claim 2, which is characterized in that side's wave generation circuit includes: square wave
Generator, two-way switch and peripheral circuit；The peripheral circuit is connected with the square-wave generator, the square-wave generator it is defeated
Outlet is connected with the input terminal of the two-way switch, the grid of the first output end of the two-way switch and first field-effect tube
Extremely it is connected, the second output terminal of the two-way switch is connected with the grid of second field-effect tube；
The peripheral circuit is used for acquisition state signal, and the status signal is sent to the square-wave generator；The side
Wave producer is used to generate corresponding square-wave signal according to the status signal, and square-wave signal is sent to two-way switch.
4. switching power converters according to claim 2, which is characterized in that the first acquisition of side's wave generation circuit
End is connected with the source electrode of first field-effect tube, for acquiring the first current signal；The second of side's wave generation circuit is adopted
Collection end is connected with the source electrode of second field-effect tube, for acquiring the second current signal；The feedback of side's wave generation circuit
End is connected with the positive output end of the output circuit, for acquiring output voltage；
Side's wave generation circuit adjusts the duty of the first square-wave signal according to first current signal and the output voltage
Than；And/or side's wave generation circuit adjusts the second square-wave signal according to second current signal and the output voltage
Duty ratio.
5. switching power converters according to claim 1, which is characterized in that when the grid of first field-effect tube connects
When receiving the first square-wave signal, the maximum value of the duty ratio of the switching power converters is no more than 60%；
When the grid of second field-effect tube receives the second square-wave signal, the duty ratio of the switching power converters is most
Big value is no more than 60%.
6. switching power converters according to claim 1, which is characterized in that the rectification circuit includes rectifier bridge and
One filter capacitor；
The input terminal of the rectifier bridge is the rectification circuit for receiving industrial-frequency alternating current, the positive output end of the rectifier bridge
Positive output end, the negative output terminal ground connection of the rectifier bridge；
One end of first filter capacitor is connected with the positive output end of the rectifier bridge, and the other end and bearing for the rectifier bridge are defeated
Outlet is connected.
7. switching power converters according to claim 1, which is characterized in that the output circuit includes: two poles of rectification
Pipe, freewheeling diode, filter inductance and the second filter capacitor；
The anode of the rectifier diode is connected with the second output terminal of the secondary coil, and the one of cathode and the filter inductance
End is connected；The other end of the filter inductance is the positive output end of the output circuit, and one with second filter capacitor
End is connected, the other end ground connection of the filter capacitor；
The anode of the freewheeling diode is connected with the first output end of the secondary coil, cathode and the rectifier diode
Cathode is connected.
8. switching power converters according to claim 1, which is characterized in that first primary coil and described second
The value range of turn ratio between primary coil is [1/3,2/3].
9. switching power converters according to claim 8, which is characterized in that first primary coil and described second
Turn ratio between primary coil 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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| 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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| US20060098466A1 (en) * | 2004-11-05 | 2006-05-11 | Chun-Ching Chang | Demagnetization circuit for using in push-pull circuit |
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| EP0550167A2 (en) * | 1991-12-23 | 1993-07-07 | General Electric Company | High-band width point-of-load power supply |
| EP0848485A2 (en) * | 1996-12-16 | 1998-06-17 | General Electric Company | High-frequency, high-efficiency converter with recirculating energy control for high-density power conversion |
| JPH11299237A (en) * | 1998-04-16 | 1999-10-29 | Nippon Electric Ind Co Ltd | Forward converter with active clamping circuit |
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