CN108599579B - Three-level high-boost isolation type DC/DC converter with adjustable bridge arm number - Google Patents
Three-level high-boost isolation type DC/DC converter with adjustable bridge arm number Download PDFInfo
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- CN108599579B CN108599579B CN201810575177.2A CN201810575177A CN108599579B CN 108599579 B CN108599579 B CN 108599579B CN 201810575177 A CN201810575177 A CN 201810575177A CN 108599579 B CN108599579 B CN 108599579B
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- 238000002955 isolation Methods 0.000 title abstract description 16
- 239000003990 capacitor Substances 0.000 claims abstract description 157
- 230000009466 transformation Effects 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 7
- 238000004088 simulation Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/285—Single converters with a plurality of output stages connected in parallel
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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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
The invention provides a three-level high-voltage bridge arm with adjustable bridge arm numberA step-up isolation type DC/DC converter, if the bridge arm number is set to be adjustable, the three-level high step-up isolation type DC/DC converter comprisesmThe bridge arms are formed as follows: a DC input voltage source, 2 input side filter capacitors, each bridge arm including 4 power switches and 2 diodes, the upper and lower sides of the bridge arm being connected with DC power supply, 2mThe personal transformation ratio is 1:kthe high-frequency transformer of (2) is provided with an inverter bridge at the other endnA high boost gain unit each containing 2mSum of capacitors 2mAnd a diode. Compared with the existing three-level isolation type DC/DC converter, the bridge arm number of the three-level isolation type DC/DC converter can be freely adjusted, currents of all bridge arms are automatically equalized, input and output gains are high, the three-level isolation type DC/DC converter can be adjusted according to the number of gain units, diode voltages and current stresses are low, and the three-level isolation type DC/DC converter can be applied to high-capacity and high-boost occasions needing electrical isolation.
Description
Technical Field
The invention relates to a direct current-direct current converter, in particular to a three-level high-boost isolation type DC/DC converter with an adjustable bridge arm number.
Background
The traditional diode bridge rectifier and three-level inverter are widely applied, but the input/output gain of the traditional diode bridge rectifier is lower, and the traditional diode bridge rectifier and three-level inverter are difficult to be qualified in occasions with higher requirements on the input/output voltage gain; the voltage and current stress of the diode at the second rectifying side is high, and the cost of using the device is high; the input phase number of the three inversion sides is not adjustable, and the use is limited in high-current occasions. At the present stage, as the capacity of the offshore wind farm is continuously expanded, the offshore distance is further and further, and the advantages of direct current convergence and power transmission are gradually highlighted. The three-level inverter is considered as a better choice of an input side inverter circuit in direct current confluence because of low voltage stress of a switching device, so that the voltage stress of a switching tube can be reduced to half of the input voltage, and meanwhile, the sine wave form of the output alternating current is better. However, the current proposal is limited by the fact that the input phase number is not adjustable, and the problem of over-high current stress of the device exists.
The rectifying side voltage-multiplying rectifying circuit can realize higher voltage output, but is often used in application occasions with smaller power grades, the problem that the diode current stress is too large to design is solved in large-capacity application occasions, if a plurality of input phases are adopted to be connected in parallel, and power among the phases is difficult to be distributed uniformly, the current stress and heating of each device in the system are unbalanced, and the reliability and the service life are greatly influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a three-level high-boost isolation type DC/DC converter with an adjustable bridge arm number, which can automatically equalize current in order to solve the problem that the current three-level inverter has an input phase number which is not adjustable and a voltage doubling rectifying circuit is difficult to equalize current when being connected in multi-phase parallel.
The invention adopts the following technical scheme:
a three-level high-boost isolation DC/DC converter with adjustable bridge arm number comprises 1 DC input power supply, 2 input side filter capacitors C 1 、C 2 M three-level inversion bridge arms, and 2m transformation ratios are 1: k high-frequency transformer, n gain units, 4m output diodes D 1 、D 2 、D 3 ...D 2m 、D 01 、D 02 、D 03 ...D 0(2m) 1 output filter capacitor C 0 1 load R L . Wherein each gain unit comprises 2m capacitors C 11 、C 12 ...C n(2m) And m diodes D 11 、D 12 ...D n(2m) . Each three-level inverter bridge arm comprises 4 power switches and 2 diodes. The m bridge arms correspond to 2m input phases, and the specific connection mode of the converter is as follows:
input side filter capacitor C 1 Another end is connected with C 2 One end, and the connection point is denoted as node 0, C 1 One end is connected with the anode of the direct current power supply, C 2 The other end is connected with the negative electrode of the direct current power supply. In the three-level bridge arm, every 4 power switches and 2 diodes form a bridge arm, namely S 11 、S 12 、S 13 、S 14 、D b11 、D b12 Form the 1 st bridge arm S 11 The drain electrode is connected with the positive electrode of the power supply S 11 Source electrode is connected with S 12 Drain and diode D b11 Cathode, S 12 Source electrode is connected with S 13 Drain, and the connection point is denoted as node 1, S 13 Source electrode is connected with S 14 Drain and diode D b12 S of (A) 14 The source electrode is connected with the cathode of the power supply, and the diode D b11 Anode of (D) is connected to diode D b12 And node 0.S is S 21 、S 22 、S 23 、S 24 、D b21 、D b22 Form the 2 nd bridge arm S 21 The drain electrode is connected with the positive electrode of the power supply S 21 Source electrode is connected with S 22 Drain and diode D b21 Cathode, S 22 Source electrode is connected with S 23 Drain, and the connection point is denoted as node 2, S 23 Source electrode is connected with S 24 Drain and diode D b22 S of (A) 24 The source electrode is connected with the cathode of the power supply, and the diode D b21 Anode of (D) is connected to diode D b22 And node 0. And so on S m1 、S m2 、S m3 、S m4 、D bm1 、D bm2 Form the mth bridge arm S m1 The drain electrode is connected with the positive electrode of the power supply S m1 Source electrode is connected with S m2 Drain and diode D bm1 Cathode, S m2 Source electrode is connected with S m3 Drain electrode, and the connection point is denoted as nodes m, S m3 Source electrode is connected with S m4 Drain and diode D bm2 S of (A) m4 The source electrode is connected with the cathode of the power supply, and the diode D bm1 Anode of (D) is connected to diode D bm2 And node 0.
Three-level bridge arm nodes 1,2 and 3.m are respectively connected with a transformer T 1 、T 3 、T 5 ...T 2m-1 The primary side is the same-name end, and the node 0 is connected with the transformer T 2 、T 4 、T 6 ...T 2m And the primary side homonymous terminals and all the primary side heteronymous terminals of the transformers are connected in sequence.
The n gain units are connected as follows:
the gain unit 1 is composed of 2m capacitors C 11 、C 12 ...C 1(2m) 2m diodes D 11 、D 12 ...D 1(2m) The internal structure of the diode D 11 Cathode of (C) is connected with capacitor C 11 Is connected with capacitor C at one end of the anode 12 Is connected with the other end of diode D 12 Cathode of (C) is connected with capacitor C 12 Is connected with capacitor C at one end of the anode 13 Diode D 1(2m-1) Cathode of (C) is connected with capacitor C 1(2m-1) Is connected with capacitor C at one end of the anode 1(2m) Is connected with the other end of diode D 1(2m) Cathode of (C) is connected with capacitor C 1(2m) One end of the anode is connected with a capacitor C 11 And the other end.
The gain unit 2 is composed of 2m capacitors C 21 、C 22 ...C 2(2m) 2m diodes D 21 、D 22 ...D 2(2m) The internal structure of the diode D 21 Cathode of (C) is connected with capacitor C 21 One end of the anode is connected with a capacitor C 22 Another end, diode D 22 Cathode of (C) is connected with capacitor C 22 One end of the anode is connected with a capacitor C 23 The other end 2(2m-1) Cathode of (C) is connected with capacitor C 2(2m-1) One end of the anode is connected with a capacitor C 2(2m) Another end, diode D 2(2m) Cathode of (C) is connected with capacitor C 2(2m) One end of the anode is connected with a capacitor C 21 And the other end.
And so on to gain element n.
The gain unit n consists of 2m capacitors C n1 、C n2 ...C nm 2m diodes D n1 、D n2 ...D n(2m) The internal structure of the diode D n1 Cathode of (C) is connected with capacitor C n1 One end of the anode is connected with a capacitor C n2 Another end, diode D n2 Cathode of (C) is connected with capacitor C n2 One end of the anode is connected with a capacitor C n3 The other end n(2m-1) Cathode of (C) is connected with capacitor C n(2m-1) One end of the anode is connected with a capacitor C n(2m) Another end, diode D n(2m) Cathode of (C) is connected with capacitor C n(2m) One end of the anode is connected with a capacitor C n1 And the other end.
All secondary side synonym ends of the transformers are connected in sequence. Capacitor C in gain cell 1 11 、C 12 ...C 1(2m) One end of (a) is respectively connected with the transformer T 1 、T 2 ...T (2m) The same name end of the secondary side, capacitor C in gain unit 2 21 、C 22 ...C 2(2m) One end of each of the capacitors is connected to the capacitor C in the gain unit 1 11 、C 12 ...C 1(2m) The other end of (2) the capacitor C in the gain unit 3 31 、C 32 ...C 3(2m) One end of each is connected with the capacitor C in the gain unit 2 21 、C 22 ...C 2(2m) The other end of the gain unit n is a capacitor C n1 、C n2 ...C n(2m) One end of each of the capacitors is connected to the capacitor C in the gain unit n-1 (n-1)1 、C (n-1)2 ...C (n-1)(2m) Capacitor C in gain element n at the other end n1 、C n2 ...C n(2m) The other ends of (a) are respectively connected with a diode D 1 、D 2 ...D 2m Cathode of diode D 1 、D 2 ...D 2m Is connected with the filter capacitor C by the anode 0 And a load R L Is provided. Filter capacitor C 0 And a load R L Is connected with the other end of diode D 01 、D 02 ...D 0(2m) Cathode of diode D 01 、D 02 ...D 0(2m) The anodes of (a) are respectively connected with the diode D in the gain unit 1 11 、D 12 ...D 1(2m) Is provided.
The three-level high-boost isolation type DC/DC converter with the adjustable bridge arm number is controlled by the following steps: the switches with the subscript tail numbers of 1 and 2 of each bridge arm are conducted in the interval of 0-90 degrees, namely S 11 、S 12 ，S 21 、S 22 ...S m1 、S m2 . The switches with the subscript tail numbers of 2 and 3 of each bridge arm are conducted in the interval of 90-180 degrees, namely S 12 、S 13 ，S 22 、S 23 ...S m2 、S m3 . The switches with 3 and 4 index tails of each bridge arm are conducted in the range of 180-270 degrees, namely S 13 、S 14 ，S 23 、S 24 ...S m3 、S m4 . The switches with the subscript tail numbers of 2 and 3 of each bridge arm are conducted in the interval of 270-360 degrees, namely S 12 、S 13 ，S 22 、S 23 ...S m2 、S m3 . Each set of switches is turned on with sufficient dead time.
The invention discloses a three-level high-boost isolation type DC/DC converter with adjustable bridge arm number, which has the following technical effects:
1. the invention realizes the high boost output of the converter by utilizing a plurality of gain units, adjusts the number of the gain units according to the requirement to change the gain, has wide application range, is more suitable for large-scale high boost occasions, and reduces the voltage stress of the secondary diode compared with the prior art. Wherein:
the input-output gain is (no load):
the voltage stress of the diode in the gain cell is:
the voltage stress of the output diode is:
wherein u is in For input voltage u 0 For output voltage, k is the number of turns of primary side on the secondary side turns ratio of the transformer, n is the number of gain units, and m is the number of three-level inversion bridge arms. (i=1, 2,) n, j=1, 2,., m
2. Because the ampere-second balance of the capacitor, each phase and each bridge arm can realize automatic current sharing, the current of each phase of the secondary side is equalized, so that the current flowing through the transformer at the primary side is equalized, the power of the transformer is equalized, no control strategy is needed to ensure current sharing, and compared with the mode of adopting an external circuit to detect and control to realize current sharing, the circuit complexity is reduced, the circuit heat dissipation is easier to control, and the cost is greatly reduced.
3. The converter can adjust the input phase number according to different application occasions, can adapt to larger large-current input occasions, increases the capacity and automatically equalizes all phases. The three-level bridge arm number is regulated to regulate the input phase number, and the current stress of each phase and the rectifying side diode can be correspondingly changed.
4. The output gain of the rectifying side is improved, the purpose of high boosting can be achieved by using a transformer with a lower transformation ratio, and the design difficulty of the transformer is greatly reduced. The three-level inversion bridge arm is adopted, the voltage stress of the switching tube is reduced to half of the input voltage, and the inverter output alternating current contains three levels and is closer to a sine wave.
Drawings
Fig. 1 is a schematic general diagram of the circuit of the present invention.
Fig. 2 is a topology diagram of 2 gain units of 2 bridge arms of the bridge arm number adjustable three-level high boost isolation type DC/DC converter.
Fig. 3 is a flow equalization principle analysis diagram.
Fig. 4 shows the input voltage u when the converter m=2 and n=2 in Output voltage u 0 Three-level inversion bridge arm output voltage u 1 Is a simulation waveform diagram of (1).
Fig. 5 shows a transformer T when the converter m=2 and n=2 1 、T 2 、T 3 、T 4 Current and diode D 11 、D 12 Simulation waveform diagram of current.
Fig. 6 is a diode D 1 、D 2 Current and diode D 11 、D 12 Simulation waveform diagram of voltage.
Fig. 7 is a diode D 1 、D 2 Voltage and capacitance C 11 、C 12 、C 21 、C 22 Simulation waveform diagram of voltage.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
As shown in FIG. 2, the three-level high-boost isolated DC/DC converter with 2 bridge arms comprises 1 DC input power supply, 2 input side filter capacitors C 1 、C 2 2 three-level inversion bridge arms, 4 transformation ratios are 1: high-frequency transformer T of k 1 、T 2 、T 3 、T 4 2 gain units, 8 output diodes D 1 、D 2 、D 3 、D 4 、D 01 、D 02 、D 03 、D 04 1 output filter capacitor C 0 1 load R L . Wherein each gainThe cell contains 4 capacitors and 4 diodes. Each three-level inverter bridge arm comprises 4 power switches and 2 diodes. The 2 bridge arms correspond to 4 input phases, and are specifically connected as follows:
input side filter capacitor C 1 Another end is connected with C 2 One end, and the connection point is denoted as node 0, C 1 One end is connected with the anode of the direct current power supply, C 2 The other end is connected with the negative electrode of the direct current power supply. In the three-level bridge arm, every 4 power switches and 2 diodes form a bridge arm, namely S 11 、S 12 、S 13 、S 14 、D b11 、D b12 Form the 1 st bridge arm S 11 The drain electrode is connected with the positive electrode of the power supply S 11 Source electrode is connected with S 12 Drain and diode D b11 Cathode, S 12 Source electrode is connected with S 13 Drain, and the connection point is denoted as node 1, S 13 Source electrode is connected with S 14 Drain and diode D b12 S of (A) 14 The source electrode is connected with the cathode of the power supply, and the diode D b11 Anode of (D) is connected to diode D b12 And node 0.S is S 21 、S 22 、S 23 、S 24 、D b21 、D b22 Form the 2 nd bridge arm S 21 The drain electrode is connected with the positive electrode of the power supply S 21 Source electrode is connected with S 22 Drain and diode D b21 Cathode, S 22 Source electrode is connected with S 23 Drain, and the connection point is denoted as node 2, S 23 Source electrode is connected with S 24 Drain and diode D b22 S of (A) 24 The source electrode is connected with the cathode of the power supply, and the diode D b21 Anode of (D) is connected to diode D b22 And node 0. Three-level bridge arm nodes 1 and 2 are respectively connected with a transformer T 1 、T 3 The primary side is the same-name end, and the node 0 is connected with the transformer T 2 、T 4 And the primary side homonymous terminals and all the primary side heteronymous terminals of the transformers are connected in sequence.
The connection mode of the 2 gain units is as follows:
the gain unit 1 is composed of 4 capacitors C 11 、C 12 、C 13 、C 14 4 diodes D 11 、D 12 、D 13 、D 14 The internal structure of the diode D 11 Cathode of (C) is connected with capacitor C 11 Is connected with capacitor C at one end of the anode 12 Is connected with the other end of diode D 12 Cathode of (C) is connected with capacitor C 12 Is connected with capacitor C at one end of the anode 13 Is connected with the other end of diode D 13 Cathode of (C) is connected with capacitor C 13 Is connected with capacitor C at one end of the anode 14 Is connected with the other end of diode D 14 Cathode of (C) is connected with capacitor C 14 Is connected with capacitor C at one end of the anode 11 And the other end of (2).
The gain unit 2 consists of 4 capacitors C 21 、C 22 、C 23 、C 24 4 diodes D 21 、D 22 、D 23 、D 24 The internal structure of the diode D 21 Cathode of (C) is connected with capacitor C 21 Is connected with capacitor C at one end of the anode 22 Is connected with the other end of diode D 22 Cathode of (C) is connected with capacitor C 22 Is connected with capacitor C at one end of the anode 23 Is connected with the other end of diode D 23 Cathode of (C) is connected with capacitor C 23 Is connected with capacitor C at one end of the anode 24 Is connected with the other end of diode D 24 Cathode of (C) is connected with capacitor C 24 Is connected with capacitor C at one end of the anode 21 And the other end of (2).
All secondary side synonym ends of the transformers are connected in sequence. Capacitor C in gain cell 1 11 、C 12 、C 13 、C 14 One end of (a) is respectively connected with the transformer T 1 、T 2 、T 3 、T 4 The same name end of the secondary side, capacitor C in gain unit 2 21 、C 22 、C 23 、C 24 One end of each of the capacitors is connected to the capacitor C in the gain unit 1 11 、C 12 、C 13 、C 14 Capacitance C at the other end of (2) 21 、C 22 、C 23 、C 24 The other ends of (a) are respectively connected with a diode D 1 、D 2 、D 3 、D 4 Cathode of diode D 1 、D 2 、D 3 、D 4 Is connected with the filter capacitor C by the anode 0 And a load R L Is provided. Filter capacitor C 0 And a load R L Is connected with the other end of diode D 01 、D 02 、D 03 、D 04 Is provided with a cathode which is arranged on the surface of the substrate,diode D 01 、D 02 、D 03 、D 04 The anodes are respectively connected with the diode D in the gain unit 1 11 、D 12 、D 13 、D 14 Is provided.
2. The control mode of the three-level high-boost isolation type DC/DC converter of the 2 bridge arms is that a switch with the subscript tail number of 1 and 2 of each bridge arm is conducted in a range of 0-90 degrees, namely S 11 、S 12 ，S 21 、S 22 . The switches with the subscript tail numbers of 2 and 3 of each bridge arm are conducted in the interval of 90-180 degrees, namely S 12 、S 13 ，S 22 、S 23 . The switches with 3 and 4 index tails of each bridge arm are conducted in the range of 180-270 degrees, namely S 13 、S 14 ，S 23 、S 24 . The switches with the subscript tail numbers of 2 and 3 of each bridge arm are conducted in the interval of 270-360 degrees, namely S 12 、S 13 ，S 22 、S 23 . Each set of switches is turned on with sufficient dead time.
According to the different power switch states, the circuit can be divided into 4 working states:
(1) Controller control switch S 11 Switch S 12 Switch S 21 Switch S 22 Conduction and switch S 13 Switch S 14 Switch S 23 Switch S 24 And switching off, and outputting a positive level by the inverter bridge arm at the moment. At this time, capacitor C 1 Discharging, capacitance C 2 And (5) charging. The positive current of the input power supply sequentially passes through the switch S 11 、S 12 Node 1, transformer T 1 Primary side homonymous terminal and heteronymous terminal, transformer T 2 The heteronymous end and the homonymous end and the node 0 form a first primary side loop. Transformer T 1 The secondary side homonymous end induces current to pass through D 11 Give electric capacity C 12 Charge and supply capacitor C 11 Discharging, current through diode D 21 To capacitor C 22 Charge and supply capacitor C 21 Discharging, current through diode D 1 To the load R L Supplying power, current flowing through the load via diode D 02 Inflow transformer T 2 The secondary side homonymous end forms a first strip and a second stripSecondary side loop, and transformer T 2 The primary side current direction is uniform. The positive current of the input power supply passes through the switch S in turn 21 Switch S 22 Node 2, transformer T 3 Primary side homonymous terminal and heteronymous terminal, transformer T 4 The heteronymous end and the homonymous end and the node 0 form a second primary side loop. Transformer T 3 The secondary side homonymous terminal induces a current to pass through the diode D 13 Give electric capacity C 14 Charge and supply capacitor C 13 Discharging, current through diode D 23 To capacitor C 24 Charging; give electric capacity C 23 Discharging, current simultaneously passing through diode D 3 To the load R L Supplying power, current flowing through the load via diode D 04 Inflow transformer T 4 The same name end of the secondary side forms a second secondary side loop which is connected with the transformer T 4 The primary side current direction is uniform. Diode D at this time 2 、D 4 、D 01 、D 03 、D 12 、D 14 、D 22 、D 24 Are all turned off.
(2) Controller control switch S 12 Switch S 13 Switch S 22 Switch S 23 Conduction and switch S 11 Switch S 14 Switch S 21 Switch S 24 And switching off, and outputting a 0 level by the inverter bridge arm at the moment. At this point all diodes are off and all capacitors are neither charging nor discharging.
(3) Controller control switch S 13 Switch S 14 Switch S 23 Switch S 24 Conduction and switch S 11 Switch S 12 Switch S 21 Switch S 22 And switching off, and outputting a negative level by the inverter bridge arm at the moment. Capacitor C 1 Charging, capacitor C 2 And (5) discharging. Capacitor C 2 The discharge sequentially passes through the node 0 and the transformer T 2 Transformer, T with same name terminal and different name terminal 3 Primary side heteronymous terminal and homonymous terminal, node 2 and switch S 23 Switch S 24 And the power supply negative electrode forms a first primary side loop. Transformer T 2 The secondary side homonymous end induces current to pass through D 12 Give electric capacity C 13 Charge and supply capacitor C 12 Discharging, current through diode D 22 To capacitor C 23 Charge and supply capacitor C 22 Discharging, current through diode D 2 To the load R L Supplying power, current flowing through the load via diode D 03 Inflow transformer T 3 The same name end of the secondary side forms a first secondary side loop and is connected with a transformer T 3 The primary side current direction is uniform. Capacitor C of the same kind 2 The discharge sequentially passes through the node 0 and the transformer T 4 Transformer, T with same name terminal and different name terminal 1 Primary side heteronymous terminal and homonymous terminal, node 1 and switch S 13 Switch S 14 And a power supply negative electrode forming a second primary side loop. Transformer T 4 The secondary side homonymous terminal induces a current to pass through the diode D 14 Give electric capacity C 11 Charge and supply capacitor C 14 Discharging, current through diode D 24 To capacitor C 21 Charging; give electric capacity C 24 Discharging, current simultaneously passing through diode D 4 To the load R L Supplying power, current flowing through the load via diode D 01 Inflow transformer T 1 The same name end of the secondary side forms a second secondary side loop which is connected with the transformer T 1 The primary side current direction is uniform. Diode D at this time 1 、D 3 、D 02 、D 04 、D 11 、D 13 、D 21 、D 23 Are all turned off.
(4) Controller control switch S 12 Switch S 13 Switch S 22 Switch S 23 Conduction and switch S 11 Switch S 14 Switch S 21 Switch S 24 The inverter outputs a 0 level at this time. At this point all diodes are off and all capacitors are neither charging nor discharging.
Simulation parameters: switching frequency f=50 kHz, input voltage u in =400V, output voltage u 0 =600v, rated power P 0 4800W, transformer ratio k=1. As can be seen from FIG. 4, when the input voltage u in When the direct current is 400V, the three-level inversion bridge arm outputs u 1 Is a stepped alternating current square wave with the amplitude of 200V, and has three levels, and outputs direct current voltage u after the post-stage rectification 0 =600v, 3 times the amplitude of alternating current. From fig. 5, the inflow transformer T 1 、T 2 Is equal to the current of diode D 11 、D 12 As can be seen, the currents flowing through the 4 transformers are equal, the power is uniform, and all phases are automatically uniform. Fig. 5 shows a diode D 1 、D 2 Current waveform and diode D 11 、D 12 Is provided. FIG. 6 shows a diode D 1 、D 2 Voltage waveform and rectifying side capacitance C of (2) 11 、C 12 、C 21 、C 22 Is provided.
Flow equalization principle:
take 1 gain cell in fig. 3 as an example. At steady state, t 0 At moment, three-level inversion bridge arm output voltage u in Can be equivalently used as a three-level alternating current power supply, and can be regarded as a capacitor C because the rising speed is very fast from 0 level 11 、C 13 Time of starting discharge and capacitor C 12 、C 14 The time when charging starts is uniform. Diode D at this time 11 、D 13 、D 1 、D 3 、D 02 、D 04 On, as in FIG. 3, at this point, u c11 ＝u c13 ＝u 0 -u in ，u c12 ＝u c14 ＝u in 。t 1 Time of day (very fast arrival), capacitance C 11 、C 13 The voltage starts to drop slowly, capacitor C 12 、C 14 The voltage starts to rise slowly and its voltage change rate is very slow. t is t 2 Time of day u c11 、u c12 、u c13 、u c14 The amount of change of (D) is sufficient to make diode D 1 、D 11 、D 3 、D 13 And (5) switching off. All the diodes are turned off, and the capacitor charging and discharging are finished. U in this period of time in And u 0 The voltage on the capacitor is kept unchanged under the condition that the parameters of each module are consistent, the capacitor C 11 、C 13 Initial discharge time and capacitor C 12 、C 14 The initial charging time is consistent, and the speed of voltage change on the capacitor is consistent as long as the capacitance value of the capacitor is kept equal，C 11 、C 13 Discharge end time and C 12 、C 14 The charging end time is also identical. The inverter turns off all diodes when outputting a 0 level, all capacitors are neither charged nor discharged, and the inverter is symmetrical to the process of outputting a positive level when outputting a negative level. Since the charge quantity of the capacitor is balanced in one period, the charge quantity of each path in one period is consistent, and the current of each path is equal, so that the automatic current sharing of each phase is deduced.
The gain unit is increased to n analysis cases similarly.
Claims (3)
1. The utility model provides an isolated DC/DC converter of three level height boost that bridge arm number is adjustable which characterized in that: comprises 1 DC input power supply, 2 input side filter capacitorsC 1 、C 2 ，mThree-level inversion bridge arm 2mThe personal transformation ratio is 1:kis provided with a high-frequency transformer of the formula (I),ngain units 4mOutput diodes D 1 、D 2 、D 3 ...D m2 、D 01 、D 02 、D 03 ...D m0(2) 1 output filter capacitorC 0 1 loadR L The method comprises the steps of carrying out a first treatment on the surface of the Wherein each gain unit contains 2mIndividual capacitorsC 11 、C 12. ..C n m(2) Andmdiode D 11 、D 12. ..D n m(2) The method comprises the steps of carrying out a first treatment on the surface of the Each three-level inversion bridge arm comprises 4 power switches and 2 diodes;mthe bridge arm corresponds to 2mThe input phases are connected as follows:
input side filter capacitorC 1 The other end is connected with the filter capacitorC 2 One end, and the connection point is recorded as node 0, filter capacitorC 1 One end is connected with the anode of the direct current power supply, and the filter capacitorC 2 The other end is connected with the negative electrode of the direct current power supply;
in the three-level bridge arm, every 4 power switches and 2 diodes form a bridge arm, namely S 11 、S 12 、S 13 、S 14 、D b11 、D b12 Form the 1 st bridge arm S 11 The drain electrode is connected with the positive electrode of the power supply S 11 Source electrode is connected with S 12 Drain and diode D b11 Cathode, S 12 Source electrode is connected with S 13 Drain, and the connection point is denoted as node 1, S 13 Source electrode is connected with S 14 Drain and diode D b12 S of (A) 14 The source electrode is connected with the cathode of the power supply, and the diode D b11 Anode of (D) is connected to diode D b12 And node 0; s is S 21 、S 22 、S 23 、S 24 、D b21 、D b22 Form the 2 nd bridge arm S 21 The drain electrode is connected with the positive electrode of the power supply S 21 Source electrode is connected with S 22 Drain and diode D b21 Cathode, S 22 Source electrode is connected with S 23 Drain, and the connection point is denoted as node 2, S 23 Source electrode is connected with S 24 Drain and diode D b22 S of (A) 24 The source electrode is connected with the cathode of the power supply, and the diode D b21 Anode of (D) is connected to diode D b22 And node 0; and so on S m1 、S m2 、S m3 、S m4 、D mb1 、D mb2 Constitute the firstmBridge arm S m1 The drain electrode is connected with the positive electrode of the power supply S m1 Source electrode is connected with S m2 Drain and diode D mb1 Cathode, S m2 Source electrode is connected with S m3 Drain electrode, and the connection point is denoted as nodem，S m3 Source electrode is connected with S m4 Drain and diode D mb2 S of (A) m4 The source electrode is connected with the cathode of the power supply, and the diode D mb1 Anode of (D) is connected to diode D mb2 And node 0;
three level bridge arm nodes 1,2, 3.mRespectively connected with a transformer T 1 、T 3 、T 5 ...T m2-1 The primary side is the same-name end, and the node 0 is connected with the transformer T 2 、T 4 、T 6 ...T m2 The primary side homonymous terminals are sequentially connected with all the primary side heteronymous terminals of the transformer;
nthe connection mode of the gain units is as follows:
gain cell 1 is defined by 2mIndividual capacitorsC 11 、C 12 ...C m1(2) ，2mDiode D 11 、D 12 ...D m1(2) The internal structure of the diode D 11 Is connected with the capacitor by the cathodeC 11 Is connected with the capacitor by the anodeC 12 Is connected with the other end of diode D 12 Is connected with the capacitor by the cathodeC 12 Is connected with the capacitor by the anodeC 13 Diode D m1(2-1) Is connected with the capacitor by the cathodeC m1(2-1) Is connected with the capacitor by the anodeC m1(2) Is connected with the other end of diode D m1(2) Is connected with the capacitor by the cathodeC m1(2) One end, anode is connected with capacitorC 11 The other end;
gain element 2 is defined by 2mIndividual capacitorsC 21 、C 22 ...C m2(2) ，2mDiode D 21 、D 22 ...D m2(2) The internal structure of the diode D 21 Is connected with the capacitor by the cathodeC 21 One end, anode is connected with capacitorC 22 Another end, diode D 22 Is connected with the capacitor by the cathodeC 22 One end, anode is connected with capacitorC 23 The other end m2(2-1) Is connected with the capacitor by the cathodeC m2(2-1) One end, anode is connected with capacitorC m2(2) Another end, diode D m2(2) Is connected with the capacitor by the cathodeC m2(2) One end, anode is connected with capacitorC 21 The other end;
and so on to gain unitn；
Gain unitnFrom 2mIndividual capacitorsC n1 、C n2 ...C nm ，2mDiode D n1 、D n2 ...D n m(2) The internal structure of the diode D n1 Is connected with the capacitor by the cathodeC n1 One end is connected with anodeCapacitance deviceC n2 Another end, diode D n2 Is connected with the capacitor by the cathodeC n2 One end, anode is connected with capacitorC n3 The other end n m(2-1) Is connected with the capacitor by the cathodeC n m(2-1) One end, anode is connected with capacitorC n m(2) Another end, diode D n m(2) Is connected with the capacitor by the cathodeC n m(2) One end, anode is connected with capacitorC n1 The other end;
all secondary side synonym ends of the transformers are connected in sequence; capacitance in gain cell 1C 11 、C 12 ...C m1(2) One end of (a) is respectively connected with the transformer T 1 、T 2 ...T m2 Secondary side homonymous terminal, capacitor in gain unit 2C 21 、C 22 ...C m2(2) One end of each of the capacitors is connected to the capacitor in the gain unit 1C 11 、C 12 ...C m1(2) The other end of (3) the capacitance in the gain cellC 31 、C 32 ...C m3(2) One end of each is connected with the capacitor in the gain unit 2C 21 、C 22 ...C m2(2) Another endnMedium capacitanceC n1 、C n2 ...C n m(2) One end of each is connected with the gain unitnCapacitance in-1C n(-1)1 、C n(-1)2 ...C n m(-1)(2) Is a gain unitnMedium capacitanceC n1 、C n2 ...C n m(2) The other ends of (a) are respectively connected with a diode D 1 、D 2 ...D m2 Cathode of diode D 1 、D 2 ...D m2 Is connected with the filter capacitor by the anodeC 0 And a loadR L Is a member of the group; filter capacitorC 0 And a load R L Is connected with the other end of diode D 01 、D 02 ...D m0(2) Cathode of diode D 01 、D 02 ...D m0(2) The anodes of (a) are respectively connected with the diode D in the gain unit 1 11 、D 12 ...D m1(2) Is provided.
2. The three-level high-boost isolated DC/DC converter with adjustable bridge arm number according to claim 1, wherein the control mode is as follows: the switches with the subscript tail numbers of 1 and 2 of each bridge arm are conducted in the interval of 0-90 degrees, namely S 11 、S 12 ，S 21 、S 22 ...S m1 、S m2 The method comprises the steps of carrying out a first treatment on the surface of the The switches with the subscript tail marks of 2 and 3 of each bridge arm are conducted in the interval of 90-180 degrees, namely S 12 、S 13 ，S 22 、S 23 ...S m2 、S m3 The method comprises the steps of carrying out a first treatment on the surface of the The switches with 3 and 4 index tails of each bridge arm are conducted in the range of 180-270 degrees, namely S 13 、S 14 ，S 23 、S 24 ...S m3 、S m4 The method comprises the steps of carrying out a first treatment on the surface of the The switches with the subscript tail marks of 2 and 3 of each bridge arm are conducted in the interval of 270-360 degrees, namely S 12 、S 13 ，S 22 、S 23 ...S m2 、S m3 The method comprises the steps of carrying out a first treatment on the surface of the Each set of switches is turned on with sufficient dead time.
3. The three-level high boost isolated DC/DC converter with adjustable bridge arm number according to claim 1, wherein: according to the different power switch states, the circuit is divided into 3 working states:
(1) Controller control switch S 11 Switch S 12 Switch S 21 Switch S 22 Conduction and switch S 13 Switch S 14 Switch S 23 Switch S 24 Turning off, and outputting a positive level by the inverter bridge arm at the moment; at this time, the filter capacitorC 1 Discharging, capacitance filtering capacitanceC 2 Charging; the positive current of the input power supply sequentially passes through the switch S 11 、S 12 Node 1, transformer T 1 Primary sideSame-name terminal and different-name terminal, transformer T 2 The heteronymous terminal and the homonymous terminal and the node 0 form a first primary side loop; transformer T 1 The secondary side homonymous end induces current to pass through D 11 Feed capacitorC 12 Charging and supplying capacitanceC 11 Discharging, current through diode D 21 Directional capacitorC 22 Charging and supplying capacitanceC 21 Discharging, current through diode D 1 To the loadR L Supplying power, current flowing through the load via diode D 02 Inflow transformer T 2 The same name end of the secondary side forms a first secondary side loop and is connected with a transformer T 2 The primary side current direction is consistent; the positive current of the input power supply passes through the switch S in turn 21 Switch S 22 Node 2, transformer T 3 Primary side homonymous terminal and heteronymous terminal, transformer T 4 The heteronymous terminal and the homonymous terminal form a second primary side loop by the node 0; transformer T 3 The secondary side homonymous terminal induces a current to pass through the diode D 13 Feed capacitorC 14 Charging and supplying capacitanceC 13 Discharging, current through diode D 23 Directional capacitorC 24 Charging; feed capacitorC 23 Discharging, current simultaneously passing through diode D 3 To the loadR L Supplying power, current flowing through the load via diode D 04 Inflow transformer T 4 The same name end of the secondary side forms a second secondary side loop which is connected with the transformer T 4 The primary side current direction is consistent; diode D at this time 2 、D 4 、D 01 、D 03 、D 12 、D 14 、D 22 、D 24 All are turned off;
(2) Controller control switch S 12 Switch S 13 Switch S 22 Switch S 23 Conduction and switch S 11 Switch S 14 Switch S 21 Switch S 24 Turning off, and outputting 0 level by the inverter bridge arm at the moment; all diodes are turned off at this time, and all capacitors are neither charged nor discharged;
(3) Controller control switch S 13 Switch S 14 Switch S 23 Switch S 24 Conduction and switch S 11 Switch S 12 Switch S 21 Switch S 22 Turning off, and outputting a negative level by the inverter bridge arm at the moment; filter capacitorC 1 Charging and filtering capacitorC 2 Discharging; filter capacitorC 2 The discharge sequentially passes through the node 0 and the transformer T 2 Transformer, T with same name terminal and different name terminal 3 Primary side heteronymous terminal and homonymous terminal, node 2 and switch S 23 Switch S 24 A power supply negative electrode forming a first primary side loop; transformer T 2 The secondary side homonymous end induces current to pass through D 12 Feed capacitorC 13 Charging and supplying capacitanceC 12 Discharging, current through diode D 22 Directional capacitorC 23 Charging and supplying capacitanceC 22 Discharging, current through diode D 2 To the loadR L Supplying power, current flowing through the load via diode D 03 Inflow transformer T 3 The same name end of the secondary side forms a first secondary side loop and is connected with a transformer T 3 The primary side current direction is consistent; filter capacitor with sameC 2 The discharge sequentially passes through the node 0 and the transformer T 4 Transformer, T with same name terminal and different name terminal 1 Primary side heteronymous terminal and homonymous terminal, node 1 and switch S 13 Switch S 14 A second primary side loop is formed by the negative electrode of the power supply; transformer T 4 The secondary side homonymous terminal induces a current to pass through the diode D 14 Feed capacitorC 11 Charging and supplying capacitanceC 14 Discharging, current through diode D 24 Directional capacitorC 21 Charging; feed capacitorC 24 Discharging, current simultaneously passing through diode D 4 To the loadR L Supplying power, current flowing through the load via diode D 01 Inflow transformer T 1 The same name end of the secondary side forms a second secondary side loop which is connected with the transformer T 1 The primary side current direction is consistent; diode D at this time 1 、D 3 、D 02 、D 04 、D 11 、D 13 、D 21 、D 23 Are all turned off.
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| CN106533173A (en) * | 2016-12-29 | 2017-03-22 | 三峡大学 | High-gain DC/DC converter with adjustable input phase number |
| CN106787723A (en) * | 2016-12-29 | 2017-05-31 | 三峡大学 | A kind of multi input boosting DC/DC converters high |
| CN106992676A (en) * | 2017-05-27 | 2017-07-28 | 三峡大学 | A kind of high-freedom degree DC/DC converters of automatic current equalizing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106533173A (en) * | 2016-12-29 | 2017-03-22 | 三峡大学 | High-gain DC/DC converter with adjustable input phase number |
| CN106787723A (en) * | 2016-12-29 | 2017-05-31 | 三峡大学 | A kind of multi input boosting DC/DC converters high |
| CN106992676A (en) * | 2017-05-27 | 2017-07-28 | 三峡大学 | A kind of high-freedom degree DC/DC converters of automatic current equalizing |
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Application publication date: 20180928 Assignee: Nanjing Chixun Electric Technology Co.,Ltd. Assignor: CHINA THREE GORGES University Contract record no.: X2023980049857 Denomination of invention: A three-level high voltage isolated DC/DC converter with adjustable bridge arms Granted publication date: 20231027 License type: Common License Record date: 20231206 |
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