CN106936300A - A kind of efficient high-gain DC_DC converters of low input current ripple of non-isolation type - Google Patents
A kind of efficient high-gain DC_DC converters of low input current ripple of non-isolation type Download PDFInfo
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- CN106936300A CN106936300A CN201710194890.8A CN201710194890A CN106936300A CN 106936300 A CN106936300 A CN 106936300A CN 201710194890 A CN201710194890 A CN 201710194890A CN 106936300 A CN106936300 A CN 106936300A
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- frequency transformer
- power switch
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/1552—Boost converters exploiting the leakage inductance of a transformer or of an alternator as boost inductor
Abstract
The invention belongs to electric and electronic technical field, more particularly to a kind of efficient high-gain DC_DC converters of the low input current ripple of non-isolation type, the converter includes：Direct voltage source, filter inductance, energy storage inductor, filter capacitor, high frequency transformer, two Boost circuits in parallel and a switching capacity voltage-multiplying circuit.The Boost circuit 1 is by the high frequency transformer primary side Np1With power switch tube S 1, sustained diodec1With electric capacity Co1Composition, the Boost circuit 2 is by the high frequency transformer primary side Np2With power switch tube S 2, sustained diodec2With electric capacity Co1Composition, the switch voltage-multiplying circuit is by the high frequency transformer secondary Ns, electric capacity C1, diode D1, diode D2With electric capacity Dc2Composition.The present invention by Interleaved control mode and it is rational filter capacitor be set reduce the pulsation of input current, by the cooperation of high-frequency step-up transformer and secondary-side switch capacitance boost both circuits so that the gain of DC_DC converters is greatly improved.It is applied in distributed power supply system more.
Description
Technical field
The present invention relates to electric and electronic power converter technique field, more particularly to a kind of low input current ripple of non-isolation type
Efficient high-gain DC_DC converters.
Background technology
With continuing to develop for society, energy shortage turns into the matter of utmost importance of facing mankind.It is new as representative with solar energy
The energy obtains the development advanced by leaps and bounds in recent years.In two-stage type photovoltaic parallel in system, due to monolithic solar array voltage
Relatively low (general 20V-50V), it is considered to voltage need to be risen to 400V or so, therefore high-gain DC_DC during line voltage normal fluctuation
Converter is indispensable part in utilization of new energy resources.In addition high-gain DC_DC converters are also widely used in such as
The various fields such as fuel cell, ups power, X-ray machine and new-energy automobile industry.As can be seen here, High-efficiency high-gain is studied
DC_DC converters it is significant.
Traditional DC/DC converters use Boost circuit, can obtain infinity when dutycycle is 1 in theory
Voltage gain, but consider the influence of circuit parasitic parameter, traditional Boost gain curve has a limit and can not obtain
Any gain high.The appearance of limit dutycycle simultaneously can deteriorate the performance of circuit, and the extremely short turn-off time causes current peak
Become big and increased switching loss and electromagnetic interference, the voltage stress increase of Simultaneous Switching pipe and diode, reverse recovery time increases
Plus, reduce the conversion efficiency of circuit.Therefore traditional Boost is not appropriate for the too high application scenario of gain.It is to close
Satisfied DC_DC properties are obtained under the duty cycle condition of reason, isolated form DC_DC converters can be by adjusting transformer voltage ratio
The gain of convenient adjustment converter, but the too high no-load voltage ratio of transformer can also increase leakage while the transformer linearity is influenceed
Sense, leakage inductance deals with the switch stress reduction conversion efficiency that can increase converter improperly, and high frequency transformer is being designed and made
It is complex.Also the method using switching capacity having increases transducer gain, and its principle can not be dashed forward using inductive current
Become and charged to electric capacity, capacitances in series is to load discharge afterwards.This quasi-converter not include high frequency transformer, design and control all compared with
For simple, and the unit cascaded convenient gain for increasing converter of switching capacity can be utilized.But this quasi-converter is due to comprising crowd
Many inductance capacitances, switch mode is complicated, impacts larger due to charge with causing to start to electric capacity during circuit start, and this external power is defeated
Entering power will get to load survey by multiple energy conversion, and the efficiency of converter is also reduced to a certain extent.Except this
Outside, the fluctuation of converter input current is larger for the new energy conversion efficiency influence as photovoltaic cell, fuel cell, such as
What realizes that the low input current fluctuation of converter is also the focus of current research.The method that tradition reduces input current is to increase input
Filter inductance, but this can undoubtedly reduce conversion its power density and efficiency.Interleaved control is charged one using two inductance one
The characteristics of electric discharge, reduces the fluctuation of input current, but better effects can only could be obtained in the case of particular duty cycle, and electricity
Road gain is limited.Therefore, the research for DC/DC converters needed for generation of electricity by new energy still needs further in-depth.
The content of the invention
It is an object of the invention to provide a kind of non-isolation type efficient high-gain DC_DC converters of low input current ripple,
Aim to solve the problem that becoming with tradition DC_DC because the high-gain that circuit parasitic parameter causes causes efficiency to reduce existing for prior art
The larger problem of parallel operation input current fluctuation.
A kind of efficient high-gain DC_DC converters of low input current ripple of non-isolation type, including：Direct voltage source Uin, filter
Ripple inductance Li, energy storage inductor L, filter capacitor Ci, high frequency transformer, power switch tube S 1, sustained diodec1, electric capacity Co1, work(
Rate switching tube S2, sustained diodec2, electric capacity C1, diode D1, diode D2With electric capacity Co2Composition；
The dc source UinPositive pole and the filter inductance LiOne end connection；
The filter inductance LiThe other end, one end of the energy storage inductor L and the filter capacitor CiOne end simultaneously connect；
The other end of the energy storage inductor L and the high frequency transformer primary side Np1Same Name of Ends and primary side Np2Different name end connects simultaneously
Connect；
The N of the high frequency transformer primary sidep1Different name end, the sustained diodec1Anode and the power switch tube S 1
Input is connected simultaneously；
The N of the high frequency transformer primary sidep2Same Name of Ends, the sustained diodec2Anode and the power switch tube S 2
Input is connected simultaneously；
The high frequency transformer secondary NsDifferent name end and the electric capacity C1One end connection；
The electric capacity C1The other end, the diode D1Negative electrode and the diode D2Anode simultaneously connect；
The diode D2Negative electrode and the electric capacity Co2One end connection；
The high frequency transformer secondary NsSame Name of Ends, the diode D1Anode, the electric capacity Co2The other end, the filter
Ripple electric capacity CiThe other end, the sustained diodec1Negative electrode, the sustained diodec2Negative electrode and the electric capacity Co1's
One end connects simultaneously；
The dc source UinNegative pole, the output end of the power switch tube S 1, the output end of the power switch tube S 2 with
The electric capacity Co1The other end simultaneously connect.
The power switch pipe is metal-oxide-semiconductor or IGBT pipes.
The high frequency transformer is the step-up transformer of the secondary of two primary side one.
The efficient high-gain DC_DC converters of the low input current ripple of a kind of non-isolation type that the present invention is provided are by staggeredly controlling
Mode processed and it is rational filter capacitor is set to reduce the pulsation of input current, by high-frequency step-up transformer and secondary-side switch
The cooperation of capacitance boost both circuits is being greatly improved the gain of DC_DC converters.
A kind of beneficial effect of non-isolation type efficient high-gain DC_DC converters of low input current ripple that the present invention is provided
It is that compared with conventional art, low input current ripple can greatly reduce circuit inductance amount, improve inverter power density
And conversion efficiency；Gain characteristic can easily be changed to adapt to different application scenarios.Converter start it is steady, impact compared with
It is small, and power device switch stress is relatively low can choose low pressure-resistant, low conduction loss power device to improve transducer effciency.
Brief description of the drawings
In order to more clearly illustrate operation principle of the invention and mode of operation, conducting existing to its each switching tube, cut
Only combine, to the various voltage and current signals of main components in its topology, under various operation modes in its topological structure
Equivalent topologies structure does accompanying drawing introduction.The embodiment of the present invention is used to explain the present invention, is not construed as limiting the invention.
Fig. 1 is topology diagram of the invention.
Fig. 2 is that embodiment is operated in the equivalent circuit diagram switched when under mode 1.
Fig. 3 is that embodiment is operated in the equivalent circuit diagram switched when under mode 2.
Fig. 4 is that embodiment is operated in the equivalent circuit diagram switched when under mode 3.
Fig. 5 is that embodiment is operated in the equivalent circuit diagram switched when under mode 4.
Fig. 6 is that embodiment is operated in the equivalent circuit diagram switched when under mode 5.
Fig. 7 is that embodiment is operated in the equivalent circuit diagram switched when under mode 6.
Fig. 8 is the electric current at electronic component upstream in embodiment, the waveform signal figure of the voltage of loading.
Fig. 9 to Figure 16 is each Experiment Parameter oscillogram in specific embodiment.
Specific embodiment
In order that the purpose of the present invention, operation principle and advantage are more clear and clear, below in conjunction with drawings and Examples,
The present invention is described in more detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, not
Limit the present invention.
A kind of non-isolation type efficient high-gain DC_DC converters of low input current ripple are the embodiment of the invention provides, please
Refering to Fig. 1, it includes：Direct voltage source, filter inductance, energy storage inductor, filter capacitor, high frequency transformer, two parallel connection Boost
Circuit and a switching capacity voltage-multiplying circuit.The Boost circuit 1 is by the high frequency transformer primary side Np1With power switch pipe
S1, sustained diodec1With electric capacity Co1Composition, the Boost circuit 2 is by the high frequency transformer primary side Np2With power switch pipe
S2, sustained diodec2With electric capacity Co1Composition, the switch voltage-multiplying circuit is by the high frequency transformer secondary Ns, electric capacity C1, two
Pole pipe D1, diode D2With electric capacity Co2Composition.
The operation principle and the course of work of present embodiment are as follows.
The efficient high-gain DC_DC converter power switch pipe S1 of the low input current ripple of non-isolation type of present embodiment drives
Dynamic signal g1, the drive signal g2 of power switch tube S 2, energy storage inductor voltage UL, energy storage inductor electric current iL, filter capacitor electric current ic、
Filter capacitor voltage Uc, high frequency transformer primary side Np1Voltage Up1, high frequency transformer primary side Np1Electric current i1, high frequency transformer primary side
Np2Electric current i2, the both end voltage U of power switch tube S 1ds1, the electric current i of power switch tube S 1s1, the both end voltage of power switch tube S 2, power
Switching tube S2 electric currents is2, sustained diode1Electric current id1, sustained diode2Electric current id2, high frequency transformer secondary NsElectric current is's
Waveform switchs mode as shown in figure 8, its course of work is divided into 6, respectively switchs mode 1 to switch mode 6, specifically describes such as
Under.
Switch the mode 1, [t in corresponding diagram 80-t1]：Equivalent circuit is as shown in Fig. 2 t0Moment power switch tube S 1, S2 is same
Shi Kaitong, energy storage inductor voltage ULEqual to power input voltage Uin, electric current iLLinear rise, the electric current i of transformer primary side winding1、
i2Also linear rise, it is equal in magnitude and to flow through energy storage inductor electric current iLHalf.Due to transformer primary side Motor Winding Same Name of Ends connection
Conversely, in equal-sized winding current i1、i2In the presence of the voltage that produces of winding to cancel out each other be zero, secondary voltage is also
Zero, all diode cut-offs, electric capacity Co1、Co2Series connection powers to the load.When power switch tube S 1 is turned off, this mode terminates.
Switch the mode 2, [t in corresponding diagram 81- t2]：Equivalent circuit is as shown in figure 3, t1Moment power switch tube S 1 is closed
Disconnected, electric current is to the parasitic capacitance C of power switch tube S 1s1Charge, S1 both end voltages Uds1Rapid increase, transformer primary secondary voltage
Up1 、UsRise, when secondary voltage rises above Uo2 When/2, diode D2Conducting, secondary voltage is clamped at Uo2/ 2, primary side
Voltage Up1Also U is clamped at therewitho2On/(2N) (N is the no-load voltage ratio of high frequency transformer), transformer starts to transmit energy, diode
D2Electric current is started from scratch rising.Electric current i1Continue to give electric capacity Cs1Charging makes Uds1Continue to rise, work as Uds1Rise above electric capacity Co1
Voltage Uo1When, sustained diodec1Conducting, electric current i1By sustained diodec1To electric capacity Co1Charge, and start linear decline.
S1 both end voltages are clamped at Uo1On, energy storage inductor voltage ULEqual to power input voltage UinWith high frequency transformer primary side Np1Electricity
The difference of pressure, electric current i1Linear decline, electric current i2With secondary current isWith electric current i1Decline and rise, work as i1When dropping to zero this
Mode terminates.
Switch mode 3, [t in corresponding diagram 82- t3]：Equivalent circuit is as shown in figure 4, t2Moment electric current i1Drop to zero, afterflow two
Pole pipe Dc1Shut-off, energy storage inductor voltage U when ignoring leakage inductanceLIt is constant.Electric current i2With secondary current isBegin to decline.Work as power switch
This mode terminates when pipe S1 is opened again.
Switch mode 4, [t in corresponding diagram 83-t4]：Equivalent circuit is as shown in figure 5, t3Moment power switch tube S 1 is opened again
It is logical, electric current i1Rapid increase, i2Rapid decrease.Work as i1、i2Equal is electric current iLHalf when be returned to t0The state at moment, works as work(
This mode terminates when rate switching tube S2 is turned off.
Switch mode 5, [t in corresponding diagram 84-t5]：Equivalent circuit is as shown in fig. 6, t4Moment power switch tube S 2 is turned off, electricity
Stream i2Charged to the parasitic capacitance of power switch tube S 2, S2 both end voltages Uds2Rapid increase, transformer primary secondary voltage Up2、Us's
Absolute value rises, as secondary voltage UsAbsolute value rises above Uo2When/2, diode D1Conducting, secondary voltage UsBe clamped at-
Uo2When/2, original edge voltage Up2Also U is clamped at therewitho2On/(2N), transformer starts to transmit energy, diode D1Electric current is from zero
Begin to ramp up.Electric current i2Continue to give electric capacity Cs2Charging makes Uds2Continue to rise, work as Uds2Rise above electric capacity Co1Voltage Uo1When,
Sustained diodec2Conducting, electric current i2By sustained diodec2To electric capacity Co1Charge, and start linear decline.Voltage Uds2Quilt
Clamper is in Uo1On, energy storage inductor ULBoth end voltage is equal to power input voltage UinWith high frequency transformer primary side Np2Difference in voltage, electricity
Stream i2Linear decline.Electric current i1With secondary current isWith electric current i2Decline and rise, work as i2This mode terminates when dropping to zero.
Switch mode 6, [t in corresponding diagram 85-t6]：Equivalent circuit is as shown in fig. 7, t5Moment electric current i2Drop to zero, afterflow
Diode Dc2Shut-off, energy storage inductor voltage U when ignoring leakage inductanceLIt is constant.Electric current i2With secondary current isBegin to decline.When power is opened
This mode when pipe S2 is opened again is closed to terminate.
Can obtain gain expressions by above-mentioned analysis is：
Wherein, D is power switch pipe conducting dutycycle, and N is the turn ratio of the high frequency transformer original vice-side winding.
The beneficial outcomes of the structure of present embodiment are used below by the data explanation of specific embodiment.
The major parameter of embodiment model machine is as shown in table 1：
The embodiment model machine major parameter of table 1
As shown in Fig. 9 to Figure 15, power switch pipe conducting dutycycle D is 0.7, input voltage Uin=20V, output voltage Uo =
200V, in figure g1, g2 be respectively power switch pipe and drive signal, Uds1、Uds2The respectively leakage of power switch tube S 1 and S2
Source voltage, Up1、Up2The respectively original edge voltage of transformer two, UL、iLRespectively energy storage inductor voltage and electric current, Uds1、is1Respectively
The drain-source voltage of power switch tube S 1 and electric current, Udc1、idc1Respectively fly-wheel diode voltage and electric current, i1To flow through transformer primary
Side winding Np1Electric current, iinIt is input current, Uc、icRespectively filter capacitor voltage and electric current, UsIt is transformer secondary voltage,
Ud1、Ud2Respectively diode D1And diode D2The voltage at two ends.The change of experimental waveform figure is can be seen that from Fig. 9 to Figure 15
Feature is consistent with theory analysis, and electric current input ripple very little.
The DC-DC converter that the present invention is provided, compared with conventional art, rationally sets filter capacitor and realizes low input current
Ripple, while circuit inductance amount can greatly be reduced, improves inverter power density and conversion efficiency.Circuit structure is flexible,
Gain characteristic can easily be changed to adapt to different application scenarios.Converter starts steadily, impacts smaller, and power device
Switch stress is relatively low can to choose low pressure-resistant, low conduction loss power device to improve transducer effciency.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (3)
1. a kind of efficient high-gain DC_DC converters of the low input current ripple of non-isolation type, it is characterised in that the converter bag
Include direct voltage source Uin, filter inductance Li, energy storage inductor L, filter capacitor Ci, high frequency transformer, power switch tube S 1, afterflow two
Pole pipe Dc1, electric capacity Co1, power switch tube S 2, sustained diodec2, electric capacity C1, diode D1, diode D2With electric capacity Co2；
The dc source UinPositive pole and the filter inductance LiOne end connection；
The filter inductance LiThe other end, one end of the energy storage inductor L and the filter capacitor CiOne end simultaneously connect；
The other end of the energy storage inductor L and the high frequency transformer primary side Np1Same Name of Ends and primary side Np2Different name end connects simultaneously
Connect；
The N of the high frequency transformer primary sidep1Different name end, the sustained diodec1Anode it is defeated with the power switch tube S 1
Enter end to connect simultaneously；
The N of the high frequency transformer primary sidep2Same Name of Ends, the sustained diodec2Anode it is defeated with the power switch tube S 2
Enter end to connect simultaneously；
The high frequency transformer secondary NsDifferent name end and the electric capacity C1One end connection；
The electric capacity C1The other end, the diode D1Negative electrode and the diode D2Anode simultaneously connect；
The diode D2Negative electrode and the electric capacity Co2One end connection；
The high frequency transformer secondary NsSame Name of Ends, the diode D1Anode, the electric capacity Co2The other end, the filter
Ripple electric capacity CiThe other end, the sustained diodec1Negative electrode, the sustained diodec2Negative electrode and the electric capacity Co1's
One end connects simultaneously；
The dc source UinNegative pole, the output end of the power switch tube S 1, the output end of the power switch tube S 2 with
The electric capacity Co1The other end simultaneously connect.
2. efficient high-gain DC_DC converters of the low input current ripple of a kind of non-isolation type according to claim 1, it is special
Levy and be, the power switch pipe is metal-oxide-semiconductor or IGBT pipes.
3. efficient high-gain DC_DC converters of the low input current ripple of a kind of non-isolation type according to claim 1, it is special
Levy and be, the high frequency transformer is the step-up transformer of the secondary of two primary side one.
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| CN110994979A (en) * | 2019-11-12 | 2020-04-10 | 广州金升阳科技有限公司 | Switch converter |
| CN111464028A (en) * | 2020-03-31 | 2020-07-28 | 天津大学 | Non-isolated low-current ripple high-voltage gain soft switching DC-DC converter |
| CN111464028B (en) * | 2020-03-31 | 2022-11-04 | 天津大学 | Non-isolated low-current-ripple high-voltage-gain soft-switching DC-DC converter |
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