CN108768169A - A kind of fuel cell double coupling alternating expression booster converters and its control method - Google Patents
A kind of fuel cell double coupling alternating expression booster converters and its control method Download PDFInfo
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- CN108768169A CN108768169A CN201810417515.XA CN201810417515A CN108768169A CN 108768169 A CN108768169 A CN 108768169A CN 201810417515 A CN201810417515 A CN 201810417515A CN 108768169 A CN108768169 A CN 108768169A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—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
- H02M3/156—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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
-
- H02J3/387—
-
- 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
- H02M3/156—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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
- H02M3/1586—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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel switched with a phase shift, i.e. interleaved
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of fuel cell double coupling alternating expression booster converters and its control method, including alternating expression Boost units, intermediate voltage-multiplying circuit and series capacitance output end, alternating expression Boost units include DC power supply Vin, reverse coupled inductance L1、L1’, Current Limiting Diodes D3With two switching tube Q1、Q2, intermediate voltage-multiplying circuit includes normal shock coupling inductance L2、L2', intermediate energy storage capacitance C1With diode D1、D2.The present invention has higher voltage gain, and system dynamic response capability is strong, can effectively inhibit current ripples and energy conversion efficiency is higher.
Description
Technical field
The present invention relates to a kind of converter and its control method, the double coupling alternating expression boostings of especially a kind of fuel cell
Converter and its control method.
Background technology
It becomes increasingly conspicuous along with a large amount of consumption problem of environmental pollutions of fossil energy, there is an urgent need for seek a kind of cleanliness without any pollution
Alternative energy source.And Hydrogen Energy derives from a wealth of sources, high combustion efficiency, clean environment firendly, it is considered to be the replacement energy of current most development space
Source.The main utilization form of Hydrogen Energy is exactly fuel cell, and the oxygen reaction conversions in hydrogen and air are electric energy, tool by hydrogen fuel cell
Have no pollution, when work efficiency is high and operation almost noiseless the advantages of, however fuel cell output voltage is generally inclined
Low and stability is poor, output current is bigger than normal, cold start-up is slow, dynamic response capability is poor, it is difficult to directly drive loaded work piece, therefore grinds
It is indispensable as the prime transformation of electric power supply system of fuel cell to study carefully a kind of high-performance DC-DC converter.
Boost converter often through raising duty ratio, switching tube frequency and passes through multiple transformer theoretically
Cascade mode achievees the purpose that improve converter voltage conversion ratio.It usually has the following problems, duty ratio is increased to pole first
End state can seriously reduce the working efficiency of system, next is limited to limiting its switching frequency and can not setting for switching device itself
That counts is too high, its gross energy transfer efficiency is the multiplication of each converter when multiple transformer cascades again, therefore its energy conversion efficiency
It is relatively low.In addition its current ripples is larger, and excessively high low-frequency current ripple has fuel cell certain harm, causes hydrogen fuel sharp
Declined with rate, operation of fuel cells efficiency reduces, the drop of the low-frequency ripple meeting accelerating proton exchange membrane of especially 100HZ or so
Solution, seriously affects the service life of battery.A kind of interlock simultaneously has been proposed in the problem of how inhibiting for current ripples, existing literature
The booster converter for joining work can reduce current ripples, but its voltage gain and single-stage booster converter to a certain extent
Quite, it could not be promoted often and effectively.
Isolated converter can also inhibit ripple, and by adjusting transformer primary pair side turn ratio, reach
The purpose of raising system step-up ratio, but with the increase of coil ratio, its leakage inductance can increase very much, and switching tube stress is larger, becomes
Parallel operation energy conversion efficiency is not high.Switching capacitors can also reach the mesh for improving voltage gain by capacitor charge and discharge
, but its current spikes in charge and discharge process is larger, also there is document combination coupling inductance switching capacity unit and tradition
Boost has obtained the changer system with higher gain and reduced-current ripple, but some converters use two-stage
Converter cascades, and energy conversion efficiency is not high.How before increasing input voltage range and effectively inhibiting current ripples
Put, improve the efficiency of the step-up ratio of converter and energy conversion, have become electric power supply system of fuel cell research hotspot it
One.Therefore the prior art is combined to design a kind of fuel cell novel DC-DC boosting changes on the basis of basic booster converter
Parallel operation.
Invention content
The invention discloses a kind of fuel cell double coupling alternating expression booster converters and its control method, have higher
Voltage gain, system dynamic response capability is strong, can effectively inhibit current ripples and energy conversion efficiency is higher.
In order to solve the above technical problems, the technical solution adopted in the present invention is：
A kind of double coupling alternating expression booster converters of fuel cell, it is characterised in that：Including alternating expression Boost units,
Intermediate voltage-multiplying circuit and series capacitance output end, alternating expression Boost units include DC power supply Vin, reverse coupled inductance L1、L1’、
Current Limiting Diodes D3With two switching tube Q1、Q2, intermediate voltage-multiplying circuit includes normal shock coupling inductance L2、L2', intermediate energy storage capacitance C1
With diode D1、D2, series capacitance output end includes storage capacitor C2、C3With load RL, DC power supply VinAnode connection current limliting
Diode D3Anode, Current Limiting Diodes D3Cathode connection reverse coupled inductance L1、L1’One end, reverse coupled inductance L1's
The other end connects normal shock coupling inductance L2One end, switching tube Q1One end and diode D1Anode, reverse coupled inductance L1’'s
Other end connecting valve pipe Q2One end, diode D2Anode and normal shock coupling inductance L2'One end, normal shock coupling inductance L2's
The other end connects intermediate energy storage capacitance C1Cathode, intermediate energy storage capacitance C1Cathode connecting diode D2Cathode, storage capacitor
C2Anode and load RLOne end, normal shock coupling inductance L2'Other end connection diode D1Cathode, storage capacitor C2It is negative
Pole and storage capacitor C3Anode, DC power supply VinCathode, switching tube Q1、Q2The other end, storage capacitor C3Cathode and load
RLThe other end ground connection.
Further, the switching tube Q1、Q2For 2 switching tubes of alternate conduction work, phase differs 180 degree, has
Identical duty ratio, and in duty ratio D>It works under=0.5 pattern.
Further, the reverse coupled inductance L1、L1’With normal shock coupling inductance L2、L2', it is the electricity of two groups of close-coupleds
Sense, coupling inductance L1、L1'With L2、L2'It is identical, coil ratio 1:1.
Further, the DC power supply VinInput termination cell of fuel cell, output end is by inverter circuit to load
It powers and generates electricity by way of merging two or more grid systems.
Further, with dsp chip TMS320F2802, core builds the experiment porch of 500W in order to control, is carried with dsp chip
For switching tube Q1With Q2Pwm control signal.
A kind of control method of the double coupling alternating expression booster converters of fuel cell, it is characterised in that include following step
Suddenly：
Step 1：Switching tube Q1、Q2It is in ON operation state, input power VinPass through Q1、Q2To coupling inductance L1、
L1'It charges, the electric current i on inductanceL1、iL1'Journey approximately linear propradation, inductance L1、L1'Voltage be its power input voltage
Vin, therefore its voltage and current equation is represented by：
Diode D1、D2Cut-off does not work, intermediate energy storage capacitance C1To load RLTo capacitance C while power supply2Charging, energy storage
Capacitance C2In voltage Vc2It gradually rises and is maintained at certain state；Storage capacitor C3To inductance L2'Electric discharge, in inductance L2、L2'
It is mutually coupled under effect, inductance L2、L2'In the equal journey linear rise state of electric current；As switching tube Q2When cut-off, this pattern terminates；
Flow through inductance L2'Electric current can approximate representation be：
Step 2：Cut-off signals drive Q2Cut-off, Q1Continue to tend to remain on, diode D1Reversed terminal voltage is higher than same
Xiang Duan, D1Cut-off does not work；Diode D2Conducting, fuel cell VinTo inductance L2With C1Branch charges, capacitance C1With charging
It carries out both end voltage gradually to increase, at the same time inductance L1'Pass through diode D2To capacitance C2It charges, to load discharge, with inductance
L2'Cooperatively to storage capacitor C3Quick charge so that capacitance C2、C3Both end voltage increases sharply, just lower negative on voltage direction；
Step 3：Two switching tube Q1、Q2It is in conducting state, diode D1、D2It is cut-off state；Input power
VinPass through Q1、Q2To inductance L1、L1'Charging, L1、 L1'Reverse coupled state is worked in, the electric current i in inductanceL1、iL1'Cheng Jin
Liny propradation, therefore inductance L1、L1'The voltage at both ends is its input supply voltage Vin；Fill with the capacitance of electricity
C3、C2Respectively to inductance L2'And C1、L2Branch charges so that capacitance C1Both end voltage Vc1It increases rapidly；
Step 4：Switching tube Q1Cut-off, Q2Conducting, diode D1Conducting, D2Cut-off, input power VinPass through Q2To coupling
Inductance L1'Charging so that L1'The voltage at both ends is supply voltage Vin, input power V at the same timeinWith energy storage inductor L1Lead to together
Cross diode D1To capacitance C3With coupling inductance L2'Charging, and with storage capacitor C2It powers to the load together；Intermediate capacitance C1For electricity
Press hold mode, voltage Vc1It remains unchanged；Capacitance C3For charged state, voltage Vc3It incrementally increases；Capacitance C2For the shape that discharges
State, voltage Vc2It gradually reduces；Coupling inductance L1、L1'With L2、L2'In electric current under the action of inductance is mutually coupled journey it is linear
Increase state.
Compared with prior art, the present invention haing the following advantages and effect：
1, the carried coupling inductance interleaved boost converter of the present invention is by Boost circuit unit, voltage-multiplying circuit and series electrical
Hold output end reasonable combination, obtain a kind of new converter, there is good voltage gain characteristic, voltage transformating ratio to obtain effectively
Improve the specific requirements that disclosure satisfy that fuel cell.It is illustrated in figure 2 converter switches pipe Q2, fuel battery voltage and defeated
The working waveform figure for going out voltage is realized in the case where duty ratio is 0.7 or so from input 48V to output 330V voltages
Transformation to realize larger voltage gain in the case of suitable duty ratio, while in turn avoiding the shape of extreme duty ratio
State；
The converter uses Interleaved control mode, is operated under Boost patterns, switching tube Q1With Q2It is staggered using two
Control mode complementary conducting in a switch periods, while inductance L1、L1'Reverse coupled, it is seen that the carried converter of the present invention
Have the advantages that ripple current is relatively low；
The present invention uses non-isolated converter topological structure, and energy conversion efficiency is higher, is illustrated in figure 3 the transformation
Device input voltage and output voltage be held in 48V, 330V it is almost unchanged in the case of working curve diagram.As seen from the figure should
Converter working efficiency can averagely reach 90% or more, and follow the variation of output power in a certain range, especially defeated
Transfer efficiency is up to 94% when going out power 450W, therefore the converter has higher energy compared with basic Boost
Transfer efficiency.
Description of the drawings
Fig. 1 is a kind of circuit diagram of the double coupling alternating expression booster converters of fuel cell of the present invention.
Fig. 2 is the input and output V of the embodiment of the present inventionin、VoOscillogram.
Fig. 3 is a kind of double coupling alternating expression booster converter efficiency curve figures of fuel cell of the present invention.
Fig. 4 is the working waveform figure of converter in the switch periods of the present invention.
Fig. 5 is the equivalent circuit of the embodiment of the present invention operating mode 1.
Fig. 6 is the equivalent circuit of the embodiment of the present invention operating mode 2.
Fig. 7 is the equivalent circuit of the embodiment of the present invention operating mode 3.
Specific implementation mode
The present invention is described in further detail below in conjunction with the accompanying drawings and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited in following embodiments.
As shown, the double coupling alternating expression booster converters of the fuel cell of the present invention include alternating expression Boost units,
Intermediate voltage-multiplying circuit and series capacitance output end, alternating expression Boost units include DC power supply Vin, reverse coupled inductance L1、L1’、
Current Limiting Diodes D3With two switching tube Q1、Q2, intermediate voltage-multiplying circuit includes normal shock coupling inductance L2、L2', intermediate energy storage capacitance
C1With diode D1、D2, series capacitance output end includes storage capacitor C2、C3With load RL, DC power supply VinAnode connection limit
Flow diode D3Anode, Current Limiting Diodes D3Cathode connection reverse coupled inductance L1、L1’One end, reverse coupled inductance L1
Other end connection normal shock coupling inductance L2One end, switching tube Q1One end and diode D1Anode, reverse coupled inductance L1’
Other end connecting valve pipe Q2One end, diode D2Anode and normal shock coupling inductance L2'One end, normal shock coupling inductance L2
Other end connection intermediate energy storage capacitance C1Cathode, intermediate energy storage capacitance C1Cathode connecting diode D2Cathode, energy storage electricity
Hold C2Anode and load RLOne end, normal shock coupling inductance L2'Other end connection diode D1Cathode, storage capacitor C2's
Cathode and storage capacitor C3Anode, DC power supply VinCathode, switching tube Q1、Q2The other end, storage capacitor C3Cathode and negative
Carry RLThe other end ground connection.
The converter is operated under inductor current continuous mode, switching tube Q1、Q2For alternate conduction work 2 switching tubes,
Its phase difference 180 degree, duty ratio having the same, and in duty ratio D>It works under=0.5 pattern.Reverse coupled inductance L1、
L1’With normal shock coupling inductance L2、 L2', it is the inductance of two groups of close-coupleds, coupling inductance L1、L1'With L2、L2'It is identical, line
It is 1 to enclose turn ratio:1.
Converter input is that the output of parallel-connection structure type is cascaded structure type；C1 is intermediate energy storage capacitance, one
The energy of absorption inductor in the section time, and to load discharge within another a period of time.DC power supply VinInput termination fuel cell
Unit, output end are powered to the load and are generated electricity by way of merging two or more grid systems by inverter circuit.
With dsp chip TMS320F2802, core builds the experiment porch of 500W in order to control, and switching tube is provided with dsp chip
Q1With Q2Pwm control signal.
A kind of fuel cell control method of double coupling alternating expression booster converters, comprises the steps of：
Step 1：Switching tube Q1、Q2It is in ON operation state, input power VinPass through Q1、Q2To coupling inductance L1、
L1'It charges, the electric current i on inductanceL1、iL1'Journey approximately linear propradation, inductance L1、L1'Voltage be its power input voltage
Vin, therefore its voltage and current equation is represented by：
Diode D1、D2Cut-off does not work, intermediate energy storage capacitance C1To load RLTo capacitance C while power supply2Charging, energy storage
Capacitance C2In voltage Vc2It gradually rises and is maintained at certain state；Storage capacitor C3To inductance L2'Electric discharge, in inductance L2、L2'
It is mutually coupled under effect, inductance L2、L2'In the equal journey linear rise state of electric current；As switching tube Q2When cut-off, this pattern terminates；
Flow through inductance L2'Electric current can approximate representation be：
Step 2：Cut-off signals drive Q2Cut-off, Q1Continue to tend to remain on, diode D1Reversed terminal voltage is higher than same
Xiang Duan, D1Cut-off does not work；Diode D2Conducting, fuel cell VinTo inductance L2With C1Branch charges, capacitance C1With charging
It carries out both end voltage gradually to increase, at the same time inductance L1'Pass through diode D2To capacitance C2It charges, to load discharge, with inductance
L2'Cooperatively to storage capacitor C3Quick charge so that capacitance C2、C3Both end voltage increases sharply, just lower negative on voltage direction；
Step 3：Two switching tube Q1、Q2It is in conducting state, diode D1、D2It is cut-off state；Input power
VinPass through Q1、Q2To inductance L1、L1'Charging, L1、 L1'Reverse coupled state is worked in, the electric current i in inductanceL1、iL1'Cheng Jin
Liny propradation, therefore inductance L1、L1'The voltage at both ends is its input supply voltage Vin；Fill with the capacitance of electricity
C3、C2Respectively to inductance L2'And C1、L2Branch charges so that capacitance C1Both end voltage Vc1It increases rapidly；
Step 4：Switching tube Q1Cut-off, Q2Conducting, diode D1Conducting, D2Cut-off, input power VinPass through Q2To coupling
Inductance L1'Charging so that L1'The voltage at both ends is supply voltage Vin, input power V at the same timeinWith energy storage inductor L1Lead to together
Cross diode D1To capacitance C3With coupling inductance L2'Charging, and with storage capacitor C2It powers to the load together；Intermediate capacitance C1For electricity
Press hold mode, voltage Vc1It remains unchanged；Capacitance C3For charged state, voltage Vc3It incrementally increases；Capacitance C2For the shape that discharges
State, voltage Vc2It gradually reduces；Coupling inductance L1、L1'With L2、L2'In electric current under the action of inductance is mutually coupled journey it is linear
Increase state.
Specific experiment parameter is as follows：Input voltage Vin=48V, output voltage Vo=330V or so, output power Po=
500W, switching tube Q1、Q2Working frequency fs=100kHZ, duty ratio takes d > 0.5, and can be adjusted by controller, in
Between capacitance C1=25uf, outlet side storage capacitor C2=25uf, C3=200uf, coupling inductance L1=L1'=L2=L2'=1mH.
Specific works waveform in a switch periods is as shown in figure 4, converter has 4 kinds of operating modes, each Working mould
As shown in Fig. 5,6,7, the course of work in different modes can be described as follows equivalent circuit under formula：
Operating mode 1 [t0~t1]：As shown in figure 5, switching tube Q at this time1、Q2It is in ON operation state, input power
VinPass through Q1、Q2To coupling inductance L1、L1'It charges, the electric current i on inductanceL1、iL1'Journey approximately linear propradation, inductance L1、L1'
Voltage be its power input voltage Vin, therefore its voltage and current equation is represented by：
Diode D1、D2Cut-off does not work, intermediate energy storage capacitance C1To load RLTo capacitance C while power supply2Charging, energy storage
Capacitance C2In voltage Vc2It gradually rises and is maintained at certain state.Storage capacitor C3To inductance L2'Electric discharge, in inductance L2、L2'
It is mutually coupled under effect, inductance L2、L2'In the equal journey linear rise state of electric current.As switching tube Q2When cut-off, this pattern terminates.
Flow through inductance L2'Electric current can approximate representation be：
Operating mode 2 [t1~t2]：As shown in fig. 6, in this operating mode, cut-off signals drive Q2Cut-off, Q1After continuation of insurance
Hold conducting state, diode D1Reversed terminal voltage is higher than end in the same direction, D1Cut-off does not work.Diode D2Conducting, fuel cell VinTo
Inductance L2With C1Branch charges, capacitance C1Gradually increase with the carry out both end voltage of charging, at the same time inductance L1'Pass through two poles
Pipe D2To capacitance C2It charges, to load discharge, with inductance L2'Cooperatively to storage capacitor C3Quick charge so that capacitance C2、C3
Both end voltage increases sharply, just lower negative on voltage direction.
Operating mode 3 [t2~t3]：As shown in fig. 7, at this moment, switching tube Q1、Q2Working method it is identical as pattern 1,
Two switching tubes are in conducting state, diode D1、D2It is cut-off state.Input power VinPass through Q1、Q2To inductance L1、
L1'Charging, L1、L1'Reverse coupled state is worked in, the electric current i in inductanceL1、iL1'Journey approximately linear propradation, therefore electricity
Feel L1、L1'The voltage at both ends is its input supply voltage Vin.The capacitance C of electricity is filled on the basis of operating mode 23、
C2Respectively to inductance L2'And C1、L2Branch charges so that capacitance C1Both end voltage Vc1It increases rapidly.
Operating mode 4 [t3~t4]：Switching tube Q1Cut-off, Q2Conducting, diode D1Conducting, D2Cut-off, input power Vin
Pass through Q2To coupling inductance L1'Charging so that L1'The voltage at both ends is supply voltage Vin, input power V at the same timeinWith energy storage
Inductance L1Pass through diode D together1To capacitance C3With coupling inductance L2'Charging, and with storage capacitor C2It powers to the load together.?
Under this operating mode, intermediate capacitance C1For voltage hold mode, voltage Vc1It is kept approximately constant；Capacitance C3For charged state,
Its voltage Vc3It incrementally increases；Capacitance C2For discharge condition, voltage Vc2It gradually reduces；Coupling inductance L1、L1'With L2、L2'In electricity
Stream linearly increasing state of journey under the action of inductance is mutually coupled.
Described in this specification above content is only illustrations made for the present invention.Technology belonging to the present invention
The technical staff in field can do various modifications or supplement to described specific embodiment or substitute by a similar method, only
The guarantor of the present invention should all be belonged to without departing from the content or beyond the scope defined by this claim of description of the invention
Protect range.
Claims (6)
1. a kind of double coupling alternating expression booster converters of fuel cell, it is characterised in that：Including alternating expression Boost units, in
Between voltage-multiplying circuit and series capacitance output end, alternating expression Boost units include DC power supply Vin, reverse coupled inductance L1、L1’, limit
Flow diode D3With two switching tube Q1、Q2, intermediate voltage-multiplying circuit includes normal shock coupling inductance L2、L2', intermediate energy storage capacitance C1With
Diode D1、D2, series capacitance output end includes storage capacitor C2、C3With load RL, DC power supply VinAnode connection current limliting two
Pole pipe D3Anode, Current Limiting Diodes D3Cathode connection reverse coupled inductance L1、L1’One end, reverse coupled inductance L1It is another
One end connects normal shock coupling inductance L2One end, switching tube Q1One end and diode D1Anode, reverse coupled inductance L1’It is another
One end connecting valve pipe Q2One end, diode D2Anode and normal shock coupling inductance L2'One end, normal shock coupling inductance L2It is another
One end connects intermediate energy storage capacitance C1Cathode, intermediate energy storage capacitance C1Cathode connecting diode D2Cathode, storage capacitor C2
Anode and load RLOne end, normal shock coupling inductance L2'Other end connection diode D1Cathode, storage capacitor C2Cathode
With storage capacitor C3Anode, DC power supply VinCathode, switching tube Q1、Q2The other end, storage capacitor C3Cathode and load RL
The other end ground connection.
2. a kind of double coupling alternating expression booster converters of fuel cell described in accordance with the claim 1, it is characterised in that：It is described
Switching tube Q1、Q2For 2 switching tubes of alternate conduction work, phase differs 180 degree, duty ratio having the same, and in duty
Compare D>It works under=0.5 pattern.
3. a kind of double coupling alternating expression booster converters of fuel cell described in accordance with the claim 1, it is characterised in that：It is described
Reverse coupled inductance L1、L1’With normal shock coupling inductance L2、L2', it is the inductance of two groups of close-coupleds, coupling inductance L1、L1'With L2、
L2'It is identical, coil ratio 1:1.
4. a kind of double coupling alternating expression booster converters of fuel cell described in accordance with the claim 1, it is characterised in that：It is described
DC power supply VinInput termination cell of fuel cell, output end are powered to the load and are generated electricity by way of merging two or more grid systems by inverter circuit.
5. a kind of double coupling alternating expression booster converters of fuel cell described in accordance with the claim 1, it is characterised in that：With
Core builds the experiment porch of 500W to dsp chip TMS320F2802 in order to control, and switching tube Q is provided with dsp chip1With Q2PWM
Control signal.
6. a kind of fuel cell control method of double coupling alternating expression booster converters, it is characterised in that comprise the steps of：
Step 1：Switching tube Q1、Q2It is in ON operation state, input power VinPass through Q1、Q2To coupling inductance L1、L1'It fills
Electricity, the electric current i on inductanceL1、iL1'Journey approximately linear propradation, inductance L1、L1'Voltage be its power input voltage Vin, therefore
Its voltage and current equation is represented by：
Diode D1、D2Cut-off does not work, intermediate energy storage capacitance C1To load RLTo capacitance C while power supply2Charging, storage capacitor
C2In voltage Vc2It gradually rises and is maintained at certain state；Storage capacitor C3To inductance L2'Electric discharge, in inductance L2、L2'Mutually
Under coupling, inductance L2、L2'In the equal journey linear rise state of electric current；As switching tube Q2When cut-off, this pattern terminates；It flows through
Inductance L2'Electric current can approximate representation be：
Step 2：Cut-off signals drive Q2Cut-off, Q1Continue to tend to remain on, diode D1Reversed terminal voltage is held higher than in the same direction,
D1Cut-off does not work；Diode D2Conducting, fuel cell VinTo inductance L2With C1Branch charges, capacitance C1With the progress of charging
Both end voltage gradually increases, at the same time inductance L1'Pass through diode D2To capacitance C2It charges, to load discharge, with inductance L2'One
It rises jointly to storage capacitor C3Quick charge so that capacitance C2、C3Both end voltage increases sharply, just lower negative on voltage direction；
Step 3：Two switching tube Q1、Q2It is in conducting state, diode D1、D2It is cut-off state；Input power VinIt is logical
Cross Q1、Q2To inductance L1、L1'Charging, L1、L1'Reverse coupled state is worked in, the electric current i in inductanceL1、iL1'Journey approximately linear
Propradation, therefore inductance L1、L1'The voltage at both ends is its input supply voltage Vin；Fill with the capacitance C of electricity3、C2Point
Not to inductance L2'And C1、L2Branch charges so that capacitance C1Both end voltage Vc1It increases rapidly；
Step 4：Switching tube Q1Cut-off, Q2Conducting, diode D1Conducting, D2Cut-off, input power VinPass through Q2To coupling inductance
L1'Charging so that L1'The voltage at both ends is supply voltage Vin, input power V at the same timeinWith energy storage inductor L1Pass through two together
Pole pipe D1To capacitance C3With coupling inductance L2'Charging, and with storage capacitor C2It powers to the load together；Intermediate capacitance C1It is protected for voltage
Hold state, voltage Vc1It remains unchanged；Capacitance C3For charged state, voltage Vc3It incrementally increases；Capacitance C2For discharge condition,
Voltage Vc2It gradually reduces；Coupling inductance L1、L1'With L2、L2'In electric current under the action of inductance is mutually coupled the linearly increasing shape of journey
State.
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| 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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