CN117040267B - Hydrogen production converter - Google Patents
Hydrogen production converter Download PDFInfo
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- CN117040267B CN117040267B CN202311019153.6A CN202311019153A CN117040267B CN 117040267 B CN117040267 B CN 117040267B CN 202311019153 A CN202311019153 A CN 202311019153A CN 117040267 B CN117040267 B CN 117040267B
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 239000001257 hydrogen Substances 0.000 title claims abstract description 43
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 239000003990 capacitor Substances 0.000 claims abstract description 58
- 238000000034 method Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000008030 elimination Effects 0.000 claims description 3
- 238000003379 elimination reaction Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000012795 verification Methods 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
- H02M3/02—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
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/60—Constructional parts of cells
- C25B9/65—Means for supplying current; Electrode connections; Electric inter-cell connections
-
- 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
- H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
-
- 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
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a hydrogen production converter, which comprises a circuit topology direct current input power supply U high First switching device S 1 Second switching device S 2 Third switching device S 3 Fourth switching device S 4 Fifth switching device S 5 First capacitor C 1 A second capacitor C 2 Third capacitor C 3 Fourth capacitor C 4 The circuit topology provided by the invention is suitable for the hydrogen production electrolytic tank, has simple structure, small number of elements, easy control, no additional auxiliary circuit, higher step-down gain, zero-voltage switching and low-switching stress can be realized, and ultra-low output current ripple can be realized under the condition of no active element.
Description
Technical Field
The invention relates to a hydrogen production converter, and belongs to the technical field of power electronics.
Background
The converter is used as power electronic equipment, has the basic function of converting one direct current into another direct current so as to meet the requirements of different direct current loads, and is widely applied to the fields of renewable energy sources, industrial control equipment, electronic products, communication equipment, distributed power supplies and the like. The hydrogen energy is used as a green clean energy source and gradually becomes a focus of attention, the electrolytic water hydrogen production is a common hydrogen production method, water is decomposed into oxygen and hydrogen through an electrolytic tank, and in the hydrogen production process, a direct-current power supply is required to be converted into proper voltage through a converter to be applied to an electrolytic system. In an actual new energy hydrogen production system, the bus voltage level is generally higher, so that the high voltage reduction ratio of the converter is particularly important, and the voltage reduction capability of the traditional voltage reduction circuit is limited at present. Meanwhile, output current ripple is also a basic factor influencing the hydrogen production efficiency, and the larger the current ripple is, the unstable hydrogen production efficiency is caused, and the problem of hydrogen production efficiency reduction is caused. There is therefore a need for a hydrogen production current transformer that addresses the above-described problems.
In the prior art, to improve the voltage reducing capability of the voltage reducing circuit, improvement is generally performed on the basis of the traditional voltage reducing circuit, such as replacing a diode in the voltage reducing circuit with a switch: nisha kondrah of indian MGU proposes a common mode tap inductance PWM buck converter operating in CCM, but it is affected by the common mode tap inductance and the voltage and current stresses on the switching devices increase. In addition to using a tapped inductor, the switch-X unit may also improve the voltage step-down capability. X refers to an inductance or capacitance and Boris Axelrod proposes a buck converter based on a switch-inductance unit, but without an increase in buck gain compared to most buck circuits. Wang Jiulong of the university of Harbin technology proposes a modified SEPIC DC-DC converter with one of the capacitors' cathodes connected to the negative pole of the power supply on the basis of a conventional SEPIC converter, but with a much less buck capability than its boost capability.
In order to reduce the output current ripple, an Mriganka biswans of indian institute of technology has proposed a buck converter having a high buck ratio, a low inductance current ripple and a low voltage stress, but the circuit size and weight thereof are large. In order to achieve ultra low current ripple, damien Guilbert at the university of loin designed an interleaved stacked buck converter to power PEM electrolytic converters, but its control method is complex, requiring additional active devices.
Disclosure of Invention
The invention aims to solve the technical problems, and provides the hydrogen production converter which has the advantages of simple topological structure, less element number, easy control, no need of any additional auxiliary circuit, high voltage reduction ratio gain and low output current ripple capacity and meets the requirements of hydrogen production electrolytic tanks.
In order to solve the technical problems, the invention adopts the following technical scheme:
the circuit topology of the hydrogen production converter comprises a direct current input power supply U high First switching device S 1 Second switching device S 2 Third switching device S 3 Fourth switching device S 4 Fifth switching device S 5 First capacitor C 1 A second capacitor C 2 Third capacitor C 3 Fourth capacitor C 4 An inductance L, a diode D and a hydrogen production electrolytic tank;
the direct current input power supply U high A positive electrode of the fifth switching device S 5 A fifth switching device S 5 The other end of (C) is connected with a third capacitor C 3 Anode of (c) and fourth switching device S 4 A third capacitor C 3 Is connected to the second switching device S 2 One end of (a) a third switching device S 3 And a first capacitor C 1 Anode, second switching device S 2 Is connected to the other end of the first switching device S 1 And a second capacitor C 2 Cathode, third switching device S 3 Is connected with the fourth switching device S 4 And a fourth capacitor C at the other end 4 Anode and second capacitor C 2 Anode, first capacitor C 1 Is connected to the first switching device S 1 The other end of the inductor L is connected with an electrolytic tank, and the other end of the electrolytic tank is connected with the cathode of the diode D and a fourth capacitor C 4 Simultaneously connected with a direct current input power supply U high The voltage across the cell is denoted U low 。
The technical scheme of the invention is further improved as follows: the two ends of the inductor L are connected with a passive ripple cancellation circuit in parallel, so that the output current ripple can be further reduced, and an additional control and feedback circuit is not needed; the passive ripple cancellation circuit comprises a high-frequency transformer with a transformation ratio of N and a magnetizing inductance L m Ripple mirror inductance L r And capacitor C r1 、C r2 Primary side connection ripple mirror image inductance L of high frequency transformer r Is a ripple mirror inductance L r The other end of (2) is connected with a capacitor C r1 Capacitance C r1 The other end of the high-frequency transformer is connected with one end of an inductor L, and the secondary side of the high-frequency transformer is connected with a capacitor C r2 Capacitance C r2 The other end of the inductor L is connected to the other end of the inductor L, and the primary side and the secondary side of the transformer are commonly connected to ground.
The technical scheme of the invention is further improved as follows: the direct current component of the inductor L is divided by a capacitor C r1 And C r2 Blocking, because the same-name ends of the transformers are opposite, the polarity of the current generated after passing through the transformers is opposite to that of the current generated before, and the ripple mirror current I at the moment Lr Having a ripple current opposite to the ripple slope of the inductor L, will ripple mirror the current I Lr Injection of inductor current I L And then ripple cancellation is achieved.
The technical scheme of the invention is further improved as follows: the circuit topology includes two operating states:
state one 0-D Buck *T s : first switching device S 1 Third switching device S 3 And a fifth switching device S 5 On, second switching device S 2 Fourth switching device S 4 Turn-off, diode D is turned off;
state two D Buck *T s -T s : first switching device S 1 Third switching device S 3 And a fifth switching device S 5 Turn off, second switching device S 2 Fourth switching device S 4 On, diode D is forward conducting.
The technical scheme of the invention is further improved as follows: the specific working process of the state one is U high 、C 3 、C 4 Form a first loop, at this time U high Is C 3 Charging C 4 、C 1 、C 2 L forms a second loop, C 4 Is C 1 、C 2 Charging L, and simultaneously feeding part of the AC current component before feeding into the inductor L into the passive ripple cancellation circuitAnd injecting opposite ripple current generated by the inductor L after the inductor L to eliminate current ripple.
The technical scheme of the invention is further improved as follows: the specific working process of the second state is that L and the electrolytic tank form a first loop, and L provides energy for the electrolytic tank; c (C) 1 、C 2 、C 3 、C 4 Form a second loop, at this time C 1 、C 2 、C 3 Is C 4 And charging, and simultaneously, part of alternating current components before flowing into the inductor L flow into a passive ripple cancellation circuit, and after the inductor L, reverse ripple current generated by the inductor L is injected, so that current ripple cancellation is realized.
The technical scheme of the invention is further improved as follows: the switching device S 2 And S is 4 Duty ratio D of (2) Buck Obtained by a voltage-current double closed-loop controller, the switching device S 1 、S 3 、S 5 The duty cycle of (2) is 1-D Buck 。
By adopting the technical scheme, the invention has the following technical progress:
1. the hydrogen production converter provided by the invention consists of the traditional voltage reduction circuit and the switch capacitor structure, and only five switch devices and four capacitors realize high-gain voltage reduction output from the view of the circuit structure, so that the circuit reliability is improved, and from the view of the working principle, the switch devices are divided into two groups to be alternately conducted, and only one duty ratio is controlled, so that the hydrogen production converter is easy to realize.
2. Compared with the staggered stacked buck converter, the hydrogen production converter provided by the invention has the advantages that the control method is simple, and extremely low output current ripple is realized under the condition of no active device; compared with a common-mode tap inductance PWM buck converter, the buck converter has the advantages of simple circuit structure and higher buck gain;
3. the hydrogen production converter provided by the invention has the capability of extremely low output current ripple and high step-down ratio gain, does not need any additional auxiliary circuit, can realize zero-voltage switching and low switching stress, and can realize ultra-low output current ripple under the condition of no active element.
Drawings
FIG. 1 is a circuit topology of a hydrogen generation converter according to the present invention;
FIG. 2 is a waveform diagram of a typical hydrogen production converter according to the present invention;
FIG. 3 is a schematic diagram of a state-process of a topology of a hydrogen generation converter according to the present invention;
FIG. 4 is a schematic diagram of a second state operation process of a hydrogen generation converter circuit topology according to the present invention;
FIG. 5 is a basic waveform diagram of a zero current ripple circuit according to the present invention;
FIG. 6 is an equivalent circuit model of a PEM (proton exchange membrane) electrolyzer for use in the present invention.
Detailed Description
The invention is further illustrated by the following examples:
as shown in fig. 1, the hydrogen production converter circuit topology provided by the invention is simple and only uses five switching devices, four capacitors, one inductor and one diode, and comprises a direct current input power supply U high First switching device S 1 Second switching device S 2 Third switching device S 3 Fourth switching device S 4 Fifth switching device S 5 First capacitor C 1 A second capacitor C 2 Third capacitor C 3 Fourth capacitor C 4 An inductance L, a diode D and a hydrogen production electrolytic tank;
the direct current input power supply U high A positive electrode of the fifth switching device S 5 A fifth switching device S 5 The other end of (C) is connected with a third capacitor C 3 Anode of (c) and fourth switching device S 4 A third capacitor C 3 Is connected to the second switching device S 2 One end of (a) a third switching device S 3 And a first capacitor C 1 Anode, second switching device S 2 Is connected to the other end of the first switching device S 1 And a second capacitor C 2 Cathode, third switching device S 3 Is connected with the fourth switching device S 4 And a fourth capacitor C at the other end 4 Anode and second capacitor C 2 Anode, first capacitor C 1 Is connected to the other end of the first switching device S 1 The other end of the inductor L is connected with an electrolytic tank, and the other end of the electrolytic tank is connected with the cathode of the diode D and a fourth capacitor C 4 Simultaneously connected with a direct current input power supply U high The voltage across the cell is denoted U low 。
By controlling the power semiconductor S when energy flows from the high-voltage side to the low-voltage side 2 、S 3 、S 4 、S 5 And a diode D to obtain U high Output voltage U after step-down low ，U D 、U S2 、U S3 、U S4 And U S5 Is the voltage stress across the corresponding diode and switch, D Buck Is a switching device S 2 And S is 4 Is a duty cycle of (c). A typical waveform of the proposed hydrogen production current transformer is shown in fig. 2.
D Buck Is a switching device S 2 And S is 4 Duty cycle of 1-D Buck Is a switching device S 1 、S 3 、S 5 Duty cycle of (2), duty cycle D Buck Obtained by a voltage-current double closed-loop controller, and the voltage U used in the controller low And current I low Obtained by sampling Hall elements, voltage U low Is controlled by a voltage controller and is connected with a reference voltage U ref After generating error signal, obtaining reference current I through voltage controller ref Then is connected with current I low Generating error signal, obtaining duty ratio D by current controller Buck 。
In order to further reduce the output current ripple, a simple and low-cost passive ripple cancellation circuit is connected in parallel to two ends of the inductor L, and no additional control and feedback circuits are needed, and the specific structure is shown in fig. 1; the passive ripple cancellation circuit comprises a high-frequency transformer with a transformation ratio of N and a magnetizing inductance L m Ripple mirror inductance L r And capacitor C r1 、C r2 Primary side connection ripple mirror image inductance L of high frequency transformer r Is a ripple mirror image of one end of (2)Inductance L r The other end of (2) is connected with a capacitor C r1 Capacitance C r1 The other end of the high-frequency transformer is connected with one end of an inductor L, and the secondary side of the high-frequency transformer is connected with a capacitor C r2 Capacitance C r2 The other end of the inductor L is connected to the other end of the inductor L, the primary side and the secondary side of the transformer are commonly connected, and the basic waveform diagram of the zero ripple circuit is shown in fig. 5.
The passive ripple cancellation circuit specifically works in such a way that the direct current component of the inductor L is divided by the capacitor C r1 And C r2 Blocking, only the ac component passing through and transmitting to the ripple mirror inductor L r To generate the same ripple current as the inductor L. Since the same-name ends of the transformers are opposite, the polarity of the current generated after passing through the transformers is opposite to that of the current generated before, namely ripple mirror current I at the moment Lr With a ripple current opposite to the ripple slope of the inductor L. Will ripple mirror current I Lr Injection of inductor current I L And then the elimination of current ripple can be realized.
In order to ensure the voltage reduction characteristic of the circuit and ensure the output function of the hydrogen production converter, and reduce current ripple, the switching sequence shown in fig. 2 is adopted and divided into two working states, and the two working states are analyzed as follows:
state one (0-D) Buck *T s ): first switching device S 1 Third switching device S 3 And a fifth switching device S 5 On, second switching device S 2 Fourth switching device S 4 Turn-off, diode D turns off, U high 、C 3 、C 4 Form a first loop, at this time U high Is C 3 And (5) charging. C (C) 4 、C 1 、C 2 L forms a second loop, C 1 、C 2 Parallel connection, the same working state can be equivalent to a capacitor, at this time C 4 Is C 1 、C 2 Charging L, wherein part of alternating current components before flowing into the inductor L flow into a passive ripple eliminating circuit, and reverse ripple current generated by the inductor L is injected after the inductor L, so that current ripple is eliminated; the operation is shown in fig. 3.
State two (D) Buck *T s -T s ): first switching device S 1 Third switching device S 3 And a fifth switching device S 5 Turn off, second switching device S 2 Fourth switching device S 4 On, diode D is turned on in the forward direction, L forms a first loop with the electrolyzer, L providing energy for the electrolyzer. C (C) 1 、C 2 、C 3 、C 4 Form a second loop, C 2 、C 3 Parallel connection, the same working state can be equivalent to a capacitor, at this time C 1 、C 2 、C 3 Is C 4 Charging, wherein part of alternating current components before flowing into the inductor L flow into a passive ripple eliminating circuit, and reverse ripple current generated by the inductor L is injected after the inductor L, so that current ripple is eliminated; the operation is shown in fig. 4.
The hydrogen production converter of the invention uses a hydrogen production electrolyzer with a PEM (proton exchange membrane) electrolyzer, which has the advantage of fast dynamic response and is more suitable for the electrolytic hydrogen production of renewable energy sources, and FIG. 6 shows an equivalent circuit of PEM, and the electrolyzer model used in this example is a PEM dynamic model, which only takes into account the cathode reaction because the cathode reaction is faster than the anode reaction, and is a more general and accurate model and equivalent method through verification, and the model parameters include the film loss model resistance R i =0.088Ω, reverse voltage V i Model resistance R for cathode activation loss of =4.38v l =0.035Ω and cathode capacitance C l The number of cells in series in the PEM cell was 7, 37.26F, which indicates the superiority of the proposed hydrogen production current transformer.
Claims (6)
1. A hydrogen production converter, characterized in that: the circuit topology of the hydrogen production converter comprises a direct current input power supplyU high First switching device S 1 Second switching device S 2 Third switching device S 3 Fourth switching device S 4 Fifth switching device S 5 A first capacitorC 1 A second capacitorC 2 Third capacitorC 3 Fourth capacitorC 4 InductanceLDiode D, hydrogen production electrolytic tank;
the direct current input power supplyU high A positive electrode of the fifth switching device S 5 A fifth switching device S 5 The other end of (a) is connected with a third capacitorC 3 Anode of (c) and fourth switching device S 4 One end of (3) a third capacitorC 3 Is connected to the second switching device S 2 One end of (a) a third switching device S 3 And a first capacitorC 1 Anode, second switching device S 2 Is connected to the other end of the first switching device S 1 And a second capacitorC 2 Cathode, third switching device S 3 Is connected with the fourth switching device S 4 And the other end, the fourth capacitanceC 4 Anode and second capacitorC 2 Anode, first capacitorC 1 Is connected to the first switching device S 1 Is the other end of (2) and inductanceLAnd the cathode of diode D, inductanceLThe other end of the electrolytic tank is connected with the anode of the diode D and the fourth capacitorC 4 Simultaneously connected with a direct current input power supplyU high The voltage across the cell is expressed asU low ；
The inductorLThe two ends of the power supply are connected with a passive ripple eliminating circuit in parallel, so that the output current ripple can be further reduced, and an additional control and feedback circuit is not needed; the passive ripple cancellation circuit includes a transformation ratio ofNHigh frequency transformer and magnetizing inductance of (a)L m Ripple mirror image inductorL r And a capacitorC r1 、C r2 The homonymous end of the primary side coil of the high-frequency transformer is connected with the ripple mirror image inductanceL r Is a ripple mirror inductorL r The other end of (a) is connected with a capacitorC r1 Is a capacitorC r1 Is connected with the inductor at the other endLIs connected with a capacitor at the different name end of the secondary side coil of the high-frequency transformerC r2 Is a capacitorC r2 Is connected with the inductor at the other endLThe other end of the primary side coil of the transformer and the same-name end of the secondary side coil are commonly connected.
2. A hydrogen generation converter according to claim 1, wherein: the inductorLIs capacitance-connected to the DC component of (a)C r1 AndC r2 blocking, because the same-name ends of the transformers are opposite, the polarity of the current generated after passing through the transformers is opposite to that of the current generated before, and ripple mirror current at the momentI Lr Having an inductance ofLRipple current with opposite ripple slope, will ripple mirror currentI Lr Current injected into the inductor LI L And then ripple cancellation is achieved.
3. A hydrogen generation converter according to claim 1, wherein: the circuit topology includes two operating states:
state one 0-D Buck *T s : first switching device S 1 Third switching device S 3 And a fifth switching device S 5 On, second switching device S 2 Fourth switching device S 4 Turn-off, diode D is turned off;
state twoD Buck *T s -T s : first switching device S 1 Third switching device S 3 And a fifth switching device S 5 Turn off, second switching device S 2 Fourth switching device S 4 On, diode D is forward conducting.
4. A hydrogen generation converter in accordance with claim 3, wherein: the specific working process of the state one is thatU high 、C 3 、C 4 Form a first loop, at this timeU high Is thatC 3 The electric power is charged up and the electric power is supplied to the electric power,C 4 、C 1 、C 2 、Lforming a second loop, in whichC 4 Is thatC 1 、C 2 、LCharging while flowing into the inductorLThe former part of alternating current component flows into a passive ripple cancellation circuit and is added into an inductorLAfter which injection and inductance are performedLThe opposite ripple current is generated, so that the elimination of current ripple is realized.
5. A hydrogen generation converter in accordance with claim 3, wherein: the specific working process of the second state is as followsLAnd the electrolytic tank form a first loop,Lproviding energy to the electrolyzer;C 1 、C 2 、C 3 、C 4 forming a second loop, in whichC 1 、C 2 、C 3 Is thatC 4 Charging while flowing into the inductorLThe former part of alternating current component flows into a passive ripple cancellation circuit and is added into an inductorLAfter which injection and inductance are performedLThe opposite ripple current is generated, so that the elimination of current ripple is realized.
6. A hydrogen generation converter in accordance with claim 4 or 5, wherein: the switching device S 1 、S 3 、S 5 Duty cycle of (2)D Buck Obtained by a voltage-current double closed-loop controller, the switching device S 2 And S is 4 The duty cycle of (2) is 1-D Buck 。
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| WO2017210340A1 (en) * | 2016-05-31 | 2017-12-07 | The Regents Of The University Of Colorado, A Body Corporate | Hybrid converter with reduced inductor loss |
| CN107947590A (en) * | 2017-12-12 | 2018-04-20 | 西安交通大学 | A kind of switching capacity two-way DC converter single supply integrated driving and control method |
| CN108023476A (en) * | 2017-12-14 | 2018-05-11 | 天津大学 | Energy composite energy source electric car switching capacity molded breadth gain two-way DC converter |
| CN115842476A (en) * | 2022-12-13 | 2023-03-24 | 浙江大学 | Single-inductor direct-current power converter based on switched capacitor |
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| US20230170795A1 (en) * | 2021-11-26 | 2023-06-01 | Samsung Electronics Co., Ltd. | Dc-dc converter and power device including the same |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017210340A1 (en) * | 2016-05-31 | 2017-12-07 | The Regents Of The University Of Colorado, A Body Corporate | Hybrid converter with reduced inductor loss |
| CN107947590A (en) * | 2017-12-12 | 2018-04-20 | 西安交通大学 | A kind of switching capacity two-way DC converter single supply integrated driving and control method |
| CN108023476A (en) * | 2017-12-14 | 2018-05-11 | 天津大学 | Energy composite energy source electric car switching capacity molded breadth gain two-way DC converter |
| CN115842476A (en) * | 2022-12-13 | 2023-03-24 | 浙江大学 | Single-inductor direct-current power converter based on switched capacitor |
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