CN108599580B - Bridge arm number adjustable high-boost isolation type DC/DC converter - Google Patents
Bridge arm number adjustable high-boost isolation type DC/DC converter Download PDFInfo
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- CN108599580B CN108599580B CN201810575178.7A CN201810575178A CN108599580B CN 108599580 B CN108599580 B CN 108599580B CN 201810575178 A CN201810575178 A CN 201810575178A CN 108599580 B CN108599580 B CN 108599580B
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- 239000003990 capacitor Substances 0.000 claims abstract description 151
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- 238000007599 discharging Methods 0.000 claims description 23
- 230000000694 effects Effects 0.000 claims description 2
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- 238000004088 simulation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 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
-
- 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
- H02M1/38—Means for preventing simultaneous conduction of switches
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal 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
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- 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
- H02M1/38—Means for preventing simultaneous conduction of switches
- H02M1/385—Means for preventing simultaneous conduction of switches with means for correcting output voltage deviations introduced by the dead time
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a bridge arm number-adjustable high-boost isolation type DC/DC converter, which comprisesmThe bridge arms are formed as follows: a DC input voltage source, 2 input side filter capacitors,mEach bridge arm,mThe 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 bridge isolation type DC/DC converter, the bridge arm number of the bridge isolation type DC/DC converter can be freely adjusted, currents of all bridge arms are automatically equalized, input and output gains are high and adjustable, the voltage and current stress of a switching device are low, and the bridge 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 high-boost isolation type DC/DC converter with an adjustable bridge arm number.
Background
Along with the continuous expansion of the scale of offshore wind farm, the advantages of DC confluence and transmission technology are gradually revealed, but the design of high-gain high-capacity DC/DC converter is a big bottleneck for restricting offshore wind power to realize DC confluence. The traditional diode bridge rectifier has wide application, but on one hand, the rectified output voltage is lower, the traditional diode bridge rectifier is difficult to be qualified in the occasion with higher requirement on the gain of the input and output voltage of an offshore wind field, and the gain of the whole converter needs to be improved by improving the turn ratio of the transformer. And the design of the large-capacity high-turn ratio transformer is difficult, and the development of the large-capacity converter is limited. On the other hand, the voltage stress of the diode is high, the voltage of a direct current bus of the offshore wind power plant is usually 40kV, and the device model selection is difficult.
The voltage doubling rectifying circuit in the current stage can realize higher voltage output, but is often used in application occasions with smaller power level, the problem that the diode current stress is too large to design is solved in large-capacity application occasions, a plurality of input phases are adopted to be connected in parallel, the power among the phases is difficult to be distributed in an equalizing mode, the current stress and the heating of each device in the system are unbalanced, and the reliability and the service life are greatly affected.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a 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 current equalization is difficult when the current voltage doubling rectifying circuits are connected in parallel in multiple phases.
The invention adopts the following technical scheme:
a bridge arm number adjustable high boost isolation DC/DC converter comprises 1 DC input power supply, 2 input side filter capacitors C 1 、C 2 M contravariant bridge arms, every bridge arm contains 2 power switches. Wherein the rectifying side has 2m transformation ratios of 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 2m diodes D 11 、D 12 ...D n(2m) . 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 inverter bridge arm, every 2 power switches form a bridge arm, namely S 11 、S 12 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 the connection point is denoted as node 1, S 12 The source electrode is connected with the negative electrode of the power supply. S is S 21 、S 22 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 the connection point is denoted as node 2, S 22 Source electrode connectionAnd a source negative electrode. And so on S m1 、S m2 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 electrode, and the node is denoted as node m, S m2 The source electrode is connected with the negative electrode of the power supply.
The inverter 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.
Gain unitn is composed 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 Anode connected with filter capacitor C 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 control mode is as follows: is at 0The switch with the subscript tail number of 1 of each bridge arm is conducted in the interval of between 180 and 180 degrees, namely S 11 、S 21 ...S m1 . And switching on a switch with the subscript tail number of 2 of each bridge arm in the range of 180-360 degrees, namely S 12 、S 22 ...S m2 . Each set of switches is turned on with sufficient dead time.
Compared with the existing isolation technology, the high-boost isolation type DC/DC converter with the adjustable bridge arm number has the following beneficial 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, can use a transformer with lower transformation ratio to achieve the purpose of high boost, and greatly reduces the design difficulty of the transformer. Compared with the prior art, the voltage stress of the secondary side diode of the converter is also reduced. 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 inverter 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 number of the inversion bridge arms is regulated to regulate the number of input phases, and the current stress of each phase and the diode can be correspondingly changed.
Drawings
FIG. 1 is a schematic general diagram of the circuit of the present invention
FIG. 2 is a topology diagram of the bridge-arm-number-adjustable high-boost isolated DC/DC converter with 2 bridge arms and 2 gain units
FIG. 3 is a flow equalization principle analysis chart
Fig. 4 shows the input voltage u when the converter m=2 and n=2 in Output voltage u 0 Capacitance C 11 、C 12 、C 21 、C 22 Voltage, inverter 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 simulation waveform diagram.
Fig. 6 shows a diode D when the converter m=2 and n=2 11 、D 12 Voltage and current simulation waveforms.
Fig. 7 shows a diode D when the converter m=2 and n=2 1 、D 2 Voltage and current simulation waveforms.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
As shown in FIG. 2, the bridge-arm-number-adjustable high-boost isolated DC/DC converter comprises 2 bridge arms, 2 gain units, 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 gain cell contains 4 capacitors and 4 diodes. Each inverter bridge arm comprises 2 power switches. 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 inverter bridge arm, every 2 power switches form a bridge arm, namely S 11 、S 12 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 the connection point is denoted as node 1, S 12 The source electrode is connected with the negative electrode of the power supply. S is S 21 、S 22 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 the connection point is denoted as node 2, S 22 The source electrode is connected with the negative electrode of the power supply.
The inverter 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 Cathode of 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 2 bridge arms high boost isolation type DC/DC converter is that a switch with the subscript tail number of 1 of each bridge arm is conducted in the interval of 0-180 degrees, namely S 11 、S 21 . And switching on a switch with the subscript tail number of 2 of each bridge arm in the range of 180-360 degrees, namely S 12 、S 22 . Each set of switches is turned on with sufficient dead time.
According to the different power switch states, the circuit can be divided into 3 working states:
(1) The power switches are all turned off, at this time, the dead time is the dead time, all the diodes are turned off, C 1 、C 2 Neither charging nor discharging; all diodes are turned off. Because the dead time is short, the effect on the converter during analysis is negligible.
(2) The controller controls the second power switch S 12 Fourth power switch S 22 Turn off, the first power switch S 11 And a third power switch S 21 Conducting. At this time, capacitor C 1 Discharging, capacitance C 2 And (5) charging. The inverter bridge arm outputs positive level, and the current flowing out from the positive electrode of the input power supply sequentially passes through the switch S 1 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 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 uniform. The positive current of the input power supply passes through the switch S in turn 3 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.
(3) The controller controls the first power switch S 11 Third power switch S 21 Turn-off, second power switch S 12 And a fourth power switch S 22 Conducting. At this time, capacitor C 1 Charging, capacitor C 2 And (5) discharging. Inverter bridge arm outputs negative level, capacitor C 2 The discharge current sequentially passes through the node 0 and the transformer T 2 Primary side homonymous terminal and heteronymous terminal, transformer T 3 Primary side heteronymous terminal and homonymous terminal, node 2 and switch S 22 A first primary loop is formed. 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 current sequentially passes through the node 0 and the transformer T 4 Primary side homonymous terminal and heteronymous terminal, transformer T 1 Primary side heteronymous terminal and homonymous terminal, node 1 and switch S 12 A second primary loop is formed. 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. At this timeDiode D 1 、D 3 、D 02 、D 04 、D 11 、D 13 、D 21 、D 23 Are all turned off.
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. From FIG. 4, the input voltage u in Output voltage u 0 Inverter bridge arm output voltage u 1 And capacitor C 11 、C 12 、C 21 、C 22 Voltage, it can be seen that when the voltage u is input in When the direct current is 400V, the inverter bridge arm outputs u 1 The alternating current square wave with the amplitude of 200V has two levels, and the direct current voltage u is output after the post-stage rectification 0 =600v, 3 times the amplitude of alternating current. From fig. 5, the inflow transformer T 1 、T 2 、T 3 、T 4 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 11 、D 12 Voltage and current waveforms of (a). FIG. 6 shows a diode D 1 、D 2 Voltage and current waveforms of (a).
Flow equalization principle:
take 1 gain cell in fig. 3 as an example. At steady state, t 0 At moment, inverter bridge arm output voltage u in Can be equivalently used as a square wave alternating current power supply, and can be regarded as a capacitor C because the rising speed is very fast 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, 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. 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. u (u) in The negative level is similar to the positive level.
The gain unit is increased to n analysis cases similarly.
Claims (1)
1. The utility model provides a bridge arm number adjustable high isolation type DC/DC converter that steps up which characterized in that: comprises 1 DC input power supply, 2 input side filter capacitorsC 1 、C 2 ，mEach bridge arm comprises 2 power switches; wherein the rectifying side has 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) And 2mDiode D 11 、D 12. ..D n m(2) ；mThe bridge arm corresponds to 2mThe specific connection modes of the converter are as follows:
input side filter capacitorC 1 Another end jointC 2 One end, and the connection point is denoted as node 0,C 1 one end of the power supply 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 inverter bridge arm, every 2 power switches form a bridge arm, namely S 11 、S 12 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 electrode, and connection point is recorded as node 1, S 12 The source electrode is connected with the negative electrode of the power supply; s is S 21 、S 22 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 electrode, and connection point is marked as node 2, S 22 The source electrode is connected with the negative electrode of the power supply; and so on S m1 、S m2 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 electrode, and the node is denoted as nodem，S m2 The source electrode is connected with the negative electrode of the power supply;
inverter leg 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, anode is connected with capacitorC 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 loadR 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) A cathode of (a);
the bridge arm number-adjustable high-boost isolation type DC/DC converter is controlled in the following manner: the switch with the subscript tail number of 1 of each bridge arm is conducted in the interval of 0-180 degrees, namely S 11 、S 21 ...S m1 The method comprises the steps of carrying out a first treatment on the surface of the The switch with the subscript tail number of 2 of each bridge arm is conducted in the interval of 180-360 degrees, namely S 12 、S 22 ...S m2 The method comprises the steps of carrying out a first treatment on the surface of the Each group of switch guidesLeaving sufficient dead time;
according to the different power switch states, the circuit is divided into 3 working states:
(1) The power switches are all turned off, at this time, the dead time, all diodes are turned off,C 1 、C 2 neither charging nor discharging; all diodes are turned off; because the dead time is short, the effect on the converter during analysis is negligible;
(2) The controller controls the second power switch S 12 Fourth power switch S 22 Turn off, the first power switch S 11 And a third power switch S 21 Conducting; at this time, the capacitorC 1 Discharging, capacitanceC 2 Charging; the inverter bridge arm outputs positive level, and the current flowing out from the positive electrode of the input power supply sequentially passes through the switch S 1 Node 1, transformer T 1 Primary side homonymous terminal and heteronymous 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 3 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;
(3) The controller controls the first power switch S 11 Third power switch S 21 Turn-off, second power switch S 12 And a fourth power switch S 22 Conducting; at this time, the capacitorC 1 Charging, capacitanceC 2 Discharging; inverter bridge arm output negative level and capacitorC 2 The discharge current sequentially passes through the node 0 and the transformer T 2 Primary side homonymous terminal and heteronymous terminal, transformer T 3 Primary side heteronymous terminal and homonymous terminal, node 2 and switch S 22 Forming a first primary 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; same-reason capacitorC 2 The discharge current sequentially passes through the node 0 and the transformer T 4 Primary side homonymous terminal and heteronymous terminal, transformer T 1 Primary side heteronymous terminal and homonymous terminal, node 1 and switch S 12 Forming a second primary loop; 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 Power supply, currentThrough the load through 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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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203800680U (en) * | 2014-05-08 | 2014-08-27 | 中国电子科技集团公司第十四研究所 | Large power bidirectional deflector capable of supporting access of multiple cell groups |
| CN204131408U (en) * | 2014-09-24 | 2015-01-28 | 华中科技大学 | A kind of MMC type commutator transformer based on multi winding transformer coupling |
| CN106787723A (en) * | 2016-12-29 | 2017-05-31 | 三峡大学 | A kind of multi input boosting DC/DC converters high |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203800680U (en) * | 2014-05-08 | 2014-08-27 | 中国电子科技集团公司第十四研究所 | Large power bidirectional deflector capable of supporting access of multiple cell groups |
| CN204131408U (en) * | 2014-09-24 | 2015-01-28 | 华中科技大学 | A kind of MMC type commutator transformer based on multi winding transformer coupling |
| CN106787723A (en) * | 2016-12-29 | 2017-05-31 | 三峡大学 | A kind of multi input boosting DC/DC converters high |
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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 High Boost Isolation DC/DC Converter with Adjustable Number of Bridge Arms Granted publication date: 20231027 License type: Common License Record date: 20231206 |
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