CN116827131A - Single-stage isolated bidirectional AC/DC converter - Google Patents
Single-stage isolated bidirectional AC/DC converter Download PDFInfo
- Publication number
- CN116827131A CN116827131A CN202310466913.1A CN202310466913A CN116827131A CN 116827131 A CN116827131 A CN 116827131A CN 202310466913 A CN202310466913 A CN 202310466913A CN 116827131 A CN116827131 A CN 116827131A
- Authority
- CN
- China
- Prior art keywords
- bridge
- full
- converter
- boost
- primary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 230000000903 blocking effect Effects 0.000 claims abstract description 9
- 238000004804 winding Methods 0.000 claims description 9
- 238000012546 transfer Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 4
- 208000037516 chromosome inversion disease Diseases 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- 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
- H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a single-stage isolated bidirectional AC/DC converter, which consists of a primary side inversion bridge, a high-frequency transformer, a transmission inductor, a blocking capacitor, a secondary side inversion bridge, a secondary side DC capacitor, an LC filter, a DC port and an AC port. The primary inverter bridge can be one of a full bridge, a half bridge and a staggered parallel Boost multiplexing full bridge; the secondary inverter bridge can be one of a full bridge and a half bridge. Depending on the topology and control scheme of the secondary inverter bridge, the LC filter may be one of a single-ended filter circuit consisting of one inductor and one capacitor or a double-ended filter circuit consisting of two inductors and one capacitor. The invention uses the high-frequency alternating current component contained in the output waveform of the secondary side inverter bridge under SPWM control, isolates the low-frequency alternating current component through a capacitor, and uses the double active bridge to carry out power transmission and control.
Description
Technical Field
The invention relates to the technical field of power electronic application, in particular to a single-stage isolated bidirectional AC/DC converter.
Technical Field
Under the influence of global energy crisis, the search for efficient, continuous and clean new energy is one of the subjects of international development today. The photovoltaic power generation and energy storage battery output direct current, and in order to grid-connect or supply power for alternating current electric appliances, direct current-alternating current conversion is needed. The AC-DC converter plays important roles of voltage conversion and power transmission, and is a key for effectively utilizing new energy, and the performance of the converter is important. The small-size and high-efficiency converter can greatly reduce loss and simultaneously reduce space occupation.
The traditional converter mostly adopts a boost-inverter two-stage topology, wherein the first stage converts the direct current input voltage into a direct current voltage of about 350V, and the second stage converts the direct current input voltage into 220V alternating current by using the boosted direct current voltage. In applications requiring isolation, the boost stage often uses a push-pull circuit in conjunction with a high frequency transformer; the inverter stage adopts a common full-bridge topology and adopts unipolar or bipolar SPWM modulation. Since this type of scheme works generally unidirectionally, it is only possible to transfer electric energy from the direct current side to the alternating current side, and is therefore generally called an inverter. In the traditional scheme, the two stages are mature schemes, and the two stages are independently operated and controlled, so that the control is simple and the design is easy. However, in the two-stage scheme, each stage needs to bear all transmission power, and electric energy needs to be converted twice, so that the overall efficiency of the converter is reduced, the number of devices is large, and the size is difficult to reduce.
To solve the above problems, there is a great deal of research on the topology of a single-stage converter. Wherein the more popular research object is the high frequency link converter topology. The topology uses a switching tube to form a bidirectional switch in opposite series connection, and directly uses the alternating voltage output by the high-frequency transformer to carry out SPWM modulation. According to the scheme, the direct current link between the boost stage and the inversion stage is eliminated, so that the direct current filter capacitor is eliminated, and the size can be obviously reduced. However, the bidirectional switch structure requires a large number of switching devices, so that the control and driving of the bidirectional switch structure are complex, and the application cost is high.
Disclosure of Invention
In view of the above-mentioned shortcomings, the present invention is directed to a single-stage isolated bidirectional ac/dc converter. The invention uses a double active bridge and inversion bridge arm multiplexing topology, reduces the number of components and eliminates the rectifier bridge loss of the boost stage by multiplexing the secondary side bridge arm of the double active bridge and the bridge arm of the inversion circuit. The topology retains the direct current bus filter capacitance, and compared with the high-frequency link inverter topology, the voltage stress of the switching device is more constant and controllable. The double active bridge enables the topology to have better wide voltage input performance and can adapt to more application occasions. The converter is capable of bi-directional operation due to the bi-active bridge having bi-directional power transfer capability.
The aim of the invention can be achieved by the following technical scheme:
a single-stage isolated bidirectional AC/DC converter comprises a primary side inverter bridge M 1 Transmission inductance L t High-frequency transformer Tr, blocking capacitor C b Secondary inverter bridge M 2 Secondary side DC capacitor C s_dc LC filter, dc port and ac port.
The primary side inverter bridge M 1 The DC port of the converter is the DC input port of the converter, and the primary side inverter bridge M 1 The high-frequency alternating current port of the high-frequency transformer Tr is connected with the primary side of the high-frequency transformer Tr; secondary side series connection transmission inductance L of high-frequency transformer Tr t Dc blocking capacitor C b Back connection secondary side inverter bridge M 2 Is provided. Secondary inverter bridge M 2 The high frequency ac port of the LC filter is connected to the high frequency port of the LC filter, and the low frequency port of the LC filter constitutes the ac output port of the inverter.
Further, the primary side inverter bridge M 1 Can be one of a full bridge, a half bridge and an interleaved parallel Boost multiplexing full bridge. If M 1 The full bridge and the half bridge are respectively connected with the positive electrode and the negative electrode of a direct current input port at the upper end and the lower end of a bridge arm, and a high-frequency alternating current port is connected with a primary winding of a high-frequency transformer Tr.
Further, what is said isThe staggered parallel Boost multiplexing full-bridge inductance L boost_1 、L boost_2 Switch tube Q 1 ～Q 4 Boost output DC filter capacitor C boost The composition is formed. Inductance L boost_1 、L boost_2 One end of the battery is connected with the input positive electrode, and the other end is respectively connected with Q 1 、Q 2 Or Q 3 、Q 4 Midpoint of the formed half bridge, Q 1 、Q 2 Or Q 3 、Q 4 DC port connection C of a half bridge boost Positive and negative electrodes of (a). Q (Q) 1 ～Q 4 The high-frequency alternating current output port of the full bridge is connected with the primary winding of the high-frequency transformer Tr.
Further, the secondary side inverter bridge M 2 May be one of a full bridge and a half bridge.
If the secondary side inverts the bridge M 2 Using a full bridge topology, the drive signal of which may be one of a unipolar or bipolar SPWM modulated signal; if the secondary side inverts the bridge M 2 A half-bridge topology is used, the drive signal of which employs bipolar SPWM modulation.
If the secondary side inverts the bridge M 2 Using full-bridge topology, unipolar modulation or half-bridge topology, bipolar modulation, corresponding LC filters employing a filter consisting of L f_1 、C f Single-ended filter, inductor L f_1 The high-frequency bridge arm output of the full bridge or the high-frequency output of the half bridge is connected; if the secondary side inverts the bridge M 2 Using full-bridge topology, bipolar modulation, the LC filter employs a filter consisting of L f_1 、L f_2 、C f The double-end filter is formed.
The converter inverts the bridge M at the secondary side 2 When SPWM is carried out, the output waveform comprises low-frequency alternating current and high-frequency pulse components, the low-frequency alternating current components are reserved after passing through an LC filter and are used as alternating current output, and meanwhile, the converter utilizes high-frequency pulse waves contained in SPWM modulated waves to carry out primary side-to-secondary side power transmission. Due to the secondary inverter bridge M 2 The generated waveform contains low-frequency alternating current components, and if the waveform is directly connected with the secondary of the high-frequency transformer Tr, the magnetic core of the waveform is saturated, so that the waveform needs to pass through a capacitor C b Isolating the low frequency ac component.
The secondary side inverter bridge M of the invention 2 The low frequency ac component is retained as ac output by LC filters using conventional SPWM control. The output waveform of the secondary side inverter bridge under SPWM control contains a large amount of high-frequency alternating current components, low-frequency alternating current components are separated through a blocking capacitor, and high-frequency pulses are reserved for power transmission of the double active bridge.
The invention has the beneficial effects that:
1. the invention multiplexes the secondary side bridge arm of the double active bridge and the bridge arm of the inverter circuit, shortens the link of power transmission and reduces the number of components.
2. The invention adopts the design of reserving the direct current bus capacitor, so that the voltage and power are controlled more stably.
The direct current bus capacitor can bear certain current ripple, so that input power fluctuation is reduced.
3. The control of the secondary inverter bridge adopted by the invention can adopt a mature SPWM inverter control strategy or a PWM rectifier control strategy, thereby reducing the design difficulty. The control of the secondary inverter bridge and the power transmission control of the double active bridges are independently operated, and the power and voltage control can be more effective and accurate, thereby being beneficial to reducing the control complexity of direct current bus voltage control, grid connection control and the like.
4. The bridge arm multiplexing design adopted by the invention reserves the voltage and power regulation capability of the double active bridges, and has stronger wide voltage working capability compared with the existing single-stage topology.
5. The staggered parallel Boost multiplexing full bridge has the boosting function, and can effectively reduce the current stress of the primary winding of the transformer in the application occasion of low input voltage. In addition, the input current ripple of the staggered parallel Boost can offset the primary winding current to a certain extent, and the current stress of the primary inverter bridge switching device is reduced.
6. The invention plays the characteristic of double active bridges, can perform bidirectional power transmission from primary side to secondary side or vice side to primary side, and meets the application requirement of AC-DC.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort;
fig. 1: a circuit structure diagram of a single-stage isolated bidirectional AC/DC converter;
fig. 2: secondary side structure using full bridge topology;
fig. 3: secondary side structure diagrams using half-bridge topologies;
fig. 4: an interleaved parallel Boost multiplexing full-bridge topology structure diagram;
fig. 5: secondary side primary waveforms using full bridge topology, unipolar modulation;
fig. 6: an equivalent duty cycle schematic;
fig. 7: an equivalent duty cycle variation curve in one period;
fig. 8: interleaving main waveforms of the parallel Boost multiplexing full bridge;
fig. 9: staggered parallel Boost multiplexing full-bridge monopulse equivalent volt-second product and duty ratio relation diagram;
fig. 10: a simulation prototype structure diagram;
fig. 11:15V input and 200W output time sampling machine main waveform;
fig. 12:30V input and 400W output time sampling machine main waveform;
fig. 13: main waveform of sample machine at 60V input and 400W output;
the specific implementation method comprises the following steps:
the following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In a specific embodiment, as shown in FIG. 1, a single stageIsolating the bi-directional ac-dc converter. The converter circuit is formed by a primary side inverter bridge M 1 Transmission inductance L t High-frequency transformer Tr, blocking capacitor C b Secondary inverter bridge M 2 Secondary side DC capacitor C s_dc LC filter, dc port and ac port.
The primary side inverter bridge M 1 Can be one of a full bridge, a half bridge and an interleaved parallel Boost multiplexing full bridge. Single M 1 When the converter is a full bridge or a half bridge, the topology of the secondary side of the converter is shown in fig. 2 and 3 respectively, the upper end and the lower end of a bridge arm of the converter are respectively connected with the positive electrode and the negative electrode of a direct current input port, and a high-frequency alternating current port is connected with a primary side winding of a high-frequency transformer Tr and an LC filter.
The staggered parallel Boost multiplexing full bridge topology is shown in figure 4, and is formed by an inductor L boost 1 、L boost 2 Switch tube Q 1 ～Q 4 Boost output DC filter capacitor C boost The composition is formed. Inductance L boost_1 、L boost_2 One end of the battery is connected with the input positive electrode, and the other end is respectively connected with Q 1 、Q 2 Or Q 3 、Q 4 Midpoint of the formed half bridge, Q 1 、Q 2 Or Q 3 、Q 4 DC port connection C of a half bridge boost Positive and negative electrodes of (a). Q (Q) 1 ～Q 4 The high-frequency alternating current output port of the full bridge is connected with the primary winding of the high-frequency transformer Tr.
If the secondary side inverts the bridge M 2 Using a full bridge topology, the drive signal of which may be one of a unipolar or bipolar SPWM modulated signal; if the secondary side inverts the bridge M 2 A half-bridge topology is used, the drive signal of which employs bipolar SPWM modulation.
If the secondary side inverts the bridge M 2 Using full-bridge topology, unipolar modulation or half-bridge topology, bipolar modulation, corresponding LC filters employing a filter consisting of L f_1 、C f Single-ended filter, inductor L f_1 The high-frequency bridge arm output of the full bridge or the high-frequency output of the half bridge is connected; if the secondary side inverts the bridge M 2 Using full-bridge topology, bipolar modulation, the LC filter employs a filter consisting of L f_1 、L f_2 、C f The double-end filter is formed.
The secondary inverter bridge output waveform under SPWM control contains a large number of high-frequency alternating current components. With secondary side inverter bridge M 2 Using full bridge topology, unipolar modulation for example, the secondary side primary waveform is shown in fig. 5 during normal operation. Wherein v is CD The output of the secondary inverter bridge is unipolar SPWM modulation wave, and the output voltage is 50Hz sine wave after LC filtering; v s V is CD The waveform after passing through the blocking capacitor is specifically a pulse wave whose duty cycle varies with the period of the SPWM control signal, but its average value is 0. Set V s_dc V is the voltage of two ends of the secondary full-bridge filter capacitor CD 、v s Peak voltages in a single cycle are all V s_dc 。
For a dual active bridge, the volt-second product of the positive and negative pulses of the waveform can be used as one of the judgment bases for the power transmission control. According to the calculation method of the volt-second product equality, as shown in FIG. 6, v can be calculated by s The waveform is converted into a peak-to-peak value V s_dc Symmetrical positive and negative pulse voltage waveform v e 。v e When the waveform of the secondary full-bridge is phase-shifted with the double active bridge, the output waveform of the secondary full-bridge is consistent. Can be v e The duty cycle of the waveform is considered to be the equivalent duty cycle of the secondary inverter bridge for dual active bridge power transfer.
Since the SPWM waveform output by the secondary full bridge directly affects the AC port output voltage, the duty cycle of the secondary full bridge cannot be used to control the power transfer of the dual active bridge. In addition, the calculation is carried out by using the single-pulse equivalent volt-second product, the equivalent duty ratio of the secondary full-bridge waveform has larger fluctuation in one period, and when the secondary inverter bridge adopts full-bridge topology and unipolar control, the equivalent duty ratio in one period is shown in fig. 7.
The double active bridge topology has two control degrees of freedom of phase shifting in the primary side and phase shifting outside the primary side besides the secondary side for power regulation. Although the equivalent duty cycle of the secondary inverter bridge fluctuates greatly within one cycle, the average equivalent duty cycle per cycle is the same. If the primary side adopts a common full-bridge topology, the transmission power can be adjusted by the duty ratio of a full-bridge driving signal, the inner shift of the full bridge and the outer shift of the secondary side relative to the primary side, and the voltage at the two ends of the secondary side direct current filter capacitor is maintained at a set value by a closed loop. As shown in fig. 7, the transmission power of the converter can be controlled by adjusting the phase angle of the primary and secondary sides.
The main working waveforms of the interleaved Boost multiplexing full bridge are shown in fig. 8 when the full bridge works normally. Set Q 1 (Q 3 ) Is of duty cycle D p C is then boost Voltage V at two ends boost Can be expressed as V boost ＝V in /D p 。v AB The voltage waveform of the high-frequency output port of the full bridge multiplexed by the staggered parallel Boost is positive and negative pulse waves, and the peak value of the voltage waveform is V boost The duty cycle expression is as follows:
the staggered parallel Boost multiplexing full bridge can change the power transmission characteristic by changing the duty ratio, and the voltage application range is wider compared with the conventional half bridge and full bridge. For a double active bridge, the volt-second product of a single pulse of the bridge arm output high frequency ac voltage can be taken as a sign of its power transfer. When D is p Normalized v when changing between 20% and 100% AB Volt-second product of individual pulses of a waveform with D p The curves of the changes are shown in fig. 9.
The boost stage of the conventional two-stage topology often adopts a unidirectional converter topology, and the bidirectional application of the alternating current-direct current converter is limited. The dual active bridge topology has bi-directional power transfer capability, generally speaking, when the secondary drive signal lags the primary drive signal, power is transferred in the forward direction; when the driving signal of the secondary side is ahead of the driving signal of the primary side, the power is reversely transmitted. If the secondary side inverter bridge M 2 The control mode of the power supply is changed into a PWM rectifier, so that reverse power transmission can be realized, and the application requirement of AC-DC is met.
To verify the feasibility of the present converter, a simulator was utilized for verification. The simulation prototype adopts a staggered parallel Boost multiplexing full bridge as a primary sideThe inverter bridge, the half bridge is used as the secondary inverter bridge, bipolar modulation is adopted, and the circuit is shown in fig. 10. The parameters of the simulated prototype are as follows: the rated input voltage is 30V, and can support 15V-60V input, the output voltage is 220V, 50Hz, the rated power is 400W, and the switching frequency is 100kHz. Wherein, the turn ratio of the transformer is 1:5, the transmission inductance is 200 mu H, and the blocking capacitance is 300nF. In the simulation, the prototype can output 400W at both rated 30V and 60V, and can output 200W at 15V. Under different input voltage states, when the converter stably works, key voltage and current waveforms are shown in fig. 10, 11 and 12, wherein v AC Representing the ac output voltage, i s Representing the secondary side current of the transformer, v s Representing the secondary voltage of the transformer, v CD Representing the voltage after passing through the transmission inductance before the blocking capacitance.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (9)
1. A single-stage isolated bidirectional AC/DC converter is characterized by comprising a primary side inverter bridge M 1 . The primary side inverter bridge M 1 Is connected with the input DC port of the converter, and the primary side inverter bridge M 1 The high-frequency AC output is connected with the primary of a high-frequency transformer Tr, the secondary of which is connected with the primary of the high-frequency transformer Tr through a transmission inductance L t Dc blocking capacitor C b After being connected in series, the secondary inverter bridge M is connected at the same time 2 And an LC filter, the secondary side inverter bridge M 2 The DC port of (2) is connected with the secondary DC capacitor C s_dc The LC filter is connected with an alternating current port.
2. A single-stage isolated bi-directional ac/dc converter as claimed in claim 1, wherein said primary inverter bridge M 1 The full-bridge type multi-bridge can be one of a full-bridge type, a half-bridge type and an interleaved parallel Boost multiplexing full-bridge type;
if M 1 The full bridge and the half bridge are respectively connected with the upper end and the lower end of a bridge arm of the full bridge and the half bridge, and the high-frequency alternating current port is connected with the primary winding of the high-frequency transformer Tr;
if M 1 The full bridge is a staggered parallel Boost multiplexing full bridge, a Boost input port of the full bridge is connected with a direct current input port of a converter, and a high-frequency alternating current port of the full bridge is connected with a primary winding of a high-frequency transformer Tr.
3. The single-stage isolated bi-directional ac/dc converter of claim 2 wherein said interleaved parallel Boost-multiplexed full-bridge is formed by Boost inductance L boost_1 、L boost_2 Switch tube Q 1 ～Q 4 Boost output DC filter capacitor C boost Constructing; inductance L boost_1 、L boost_2 One end of the battery is connected with the input positive electrode, and the other end is respectively connected with Q 1 、Q 2 Or Q 3 、Q 4 Midpoint of the formed half bridge, Q 1 、Q 2 Or Q 3 、Q 4 DC port connection C of a half bridge boost Positive and negative electrodes of (a); q (Q) 1 ～Q 4 The high-frequency alternating current output port of the full bridge is connected with the primary winding of the high-frequency transformer Tr.
4. The single-stage isolated bi-directional ac/dc converter of claim 1 comprising a secondary inverter bridge M 2 . Auxiliary pairEdge inversion bridge M 2 Can be one of a full bridge and a half bridge; m is M 2 In the case of full bridge topology, one of unipolar modulation or bipolar modulation may be used; m is M 2 With half-bridge topology, bipolar modulation may be used.
5. A single-stage isolated bi-directional ac/dc converter according to claim 1, wherein said secondary inverter bridge M 2 The LC filter can be formed by an inductor L f_1 And a capacitor C f Single-ended filter circuit consisting of or consisting of two inductances L f_1 、L f_1 And a capacitor C f One of the two-terminal filter circuits is formed.
6. A single-stage isolated bi-directional ac/dc converter as claimed in claim 1, wherein said primary inverter bridge M 1 Bridge M inverted with secondary side 2 The operating frequency of (a) is the same.
7. A single-stage isolated bi-directional ac/dc converter according to claim 1, wherein said primary inverter bridge M is varied by 1 Bridge M inverted with secondary side 2 The angle of the transfer term between them adjusts the transmission power of the inverter.
8. A single-stage isolated bi-directional ac/dc converter as claimed in claim 1, wherein if said primary inverter bridge M 1 By changing M using full bridge topology 1 The transmission power of the converter is adjusted by the full-bridge intra-phase angle; if the primary side inverts the bridge M 1 And the transmission power of the converter is adjusted by changing the duty ratio of bridge arm Boost operation by adopting an interleaved parallel Boost multiplexing full bridge.
9. A single-stage isolated bi-directional ac-dc converter according to claim 1, wherein said converter is capable of bi-directional power transfer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310466913.1A CN116827131A (en) | 2023-04-26 | 2023-04-26 | Single-stage isolated bidirectional AC/DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310466913.1A CN116827131A (en) | 2023-04-26 | 2023-04-26 | Single-stage isolated bidirectional AC/DC converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116827131A true CN116827131A (en) | 2023-09-29 |
Family
ID=88123037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310466913.1A Pending CN116827131A (en) | 2023-04-26 | 2023-04-26 | Single-stage isolated bidirectional AC/DC converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116827131A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117805690A (en) * | 2024-02-28 | 2024-04-02 | 西安为光能源科技有限公司 | Method for detecting polarity reversal of double-active-bridge topological isolation transformer |
-
2023
- 2023-04-26 CN CN202310466913.1A patent/CN116827131A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117805690A (en) * | 2024-02-28 | 2024-04-02 | 西安为光能源科技有限公司 | Method for detecting polarity reversal of double-active-bridge topological isolation transformer |
| CN117805690B (en) * | 2024-02-28 | 2024-05-03 | 西安为光能源科技有限公司 | Method for detecting polarity reversal of double-active-bridge topological isolation transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101197547B (en) | Three-phase synchronization AC generating circuit and its control method | |
| CN100499343C (en) | AC-AC three level AC-AC converter based on positive converter | |
| CN104426408B (en) | Translation circuit and be applied to translation circuit conversion electric power changing method | |
| CN107017781B (en) | The ISOP full-bridge direct current converter and its control method of asymmetrical PWM control | |
| CN103001511B (en) | Voltage converter and operating method thereof | |
| US8111528B2 (en) | DC to AC inverter | |
| CN109980978B (en) | Converter and modulation method thereof | |
| CN102510215B (en) | Three-level bidirectional direct-current converter and pulse width control method thereof | |
| CN107134937B (en) | Three-level multi-pulse output transformerless inverter circuit | |
| CN103595287A (en) | Method for controlling double-direction power flow high-frequency isolated active clamping inverter | |
| CN106130352B (en) | The micro- inverter of intermediate current type double tube positive exciting and its numerical control device | |
| CN1348248A (en) | High-frequency AC/AC converter with AC link | |
| CN105591559A (en) | Multi-port converter based on high-frequency inversion | |
| CN110289765A (en) | A kind of the DAB type commutator transformer submodule topology and its control method of high power density | |
| CN116827131A (en) | Single-stage isolated bidirectional AC/DC converter | |
| CN117013866A (en) | Single-stage wide-voltage isolation bidirectional AC/DC converter | |
| CN103856061B (en) | The gamut soft-switching process of input series and output parallel phase-shifted full-bridge converter | |
| CN206865369U (en) | Three level multiple-pulses export transformerless inverter circuit | |
| CN111049403B (en) | Nine-level inverter of buck-boost type switched capacitor | |
| CN206023611U (en) | High frequency isolation type five-electrical level inverter | |
| CN110492753A (en) | A kind of equivalent control method of the two-way full-bridge DC-DC converter with energy storage inductor | |
| CN116054571A (en) | Alternating parallel three-level soft switch direct current boost converter | |
| CN109818494A (en) | A kind of quasi- source Y DC-DC converter of high gain voltage type | |
| CN1758521A (en) | Single-stage two-way step down DC converter type high frequency link inverter | |
| CN107482919A (en) | Control method based on Boost full-bridge isolated converters |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |