CN220342219U - Current type multiple bidirectional inverter circuit capable of removing subharmonic - Google Patents
Current type multiple bidirectional inverter circuit capable of removing subharmonic Download PDFInfo
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- CN220342219U CN220342219U CN202321852774.8U CN202321852774U CN220342219U CN 220342219 U CN220342219 U CN 220342219U CN 202321852774 U CN202321852774 U CN 202321852774U CN 220342219 U CN220342219 U CN 220342219U
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Abstract
The utility model discloses a current-type multiple bidirectional subharmonic-free inverter circuit which comprises a first circuit and a second circuit, wherein the first circuit comprises a first power supply, a first bridge arm and a second bridge arm which are connected in parallel with the first power supply, the second circuit comprises a second power supply, a third bridge arm and a fourth bridge arm which are connected in parallel with the second power supply, the third bridge arm, the first bridge arm, the second bridge arm and the fourth bridge arm are sequentially arranged between the first power supply and the second power supply, the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm respectively comprise two fully-controlled devices which are sequentially connected in series and a reactor which is connected in series between the two fully-controlled devices, neutral points of reactors in the third bridge arm and the first bridge arm are connected to one end of a load, and neutral points of reactors in the second bridge arm and the fourth bridge arm are connected to the other end of the load. The utility model has simple structure and effectively solves the problem of removing harmonic components in common inverter circuits.
Description
Technical Field
The utility model relates to the technical field of power electronics, in particular to a current type multiple bidirectional subharmonic-removable inverter circuit.
Background
In the implementation of direct current-alternating current (DC/AC) inverter circuits, harmonics are common, which are detrimental to load operation. At present, in an inverter circuit, subharmonics are removed by a multiple connection mode of a voltage type inverter circuit, and a method for removing the harmonics by the multiple current type inverter mode is not much researched.
Disclosure of Invention
The present utility model is directed to an inverter circuit capable of removing subharmonics in multiple current directions, so as to solve the above-mentioned problems in the prior art.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the current type multiple bidirectional subharmonic-removing inverter circuit comprises a first circuit and a second circuit, wherein the first circuit comprises a first power supply, a first bridge arm and a second bridge arm which are connected in parallel with the first power supply, the second circuit comprises a second power supply, a third bridge arm and a fourth bridge arm which are connected in parallel with the second power supply, the third bridge arm, the first bridge arm, the second bridge arm and the fourth bridge arm are sequentially arranged between the first power supply and the second power supply, the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm respectively comprise two fully-controlled devices which are sequentially connected in series and a reactor which is connected in series between the two fully-controlled devices, neutral points of the reactors in the third bridge arm and the first bridge arm are connected to one end of a load, and neutral points of the reactors in the second bridge arm and the fourth bridge arm are connected to the other end of the load.
In the current-type multiple bidirectional subharmonic-removed inverter circuit, the first power supply and the second power supply are both direct current power supplies and are respectively connected with an inductor in series.
Further, in the current-type multiple bidirectional subharmonic-removable inverter circuit, each fully-controlled device is connected in anti-parallel with a power diode.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model has simple structure, symmetrical arrangement of electronic devices in the circuit, tidy and beautiful appearance, simple and convenient wiring, and realizes the basic function of direct current/alternating current inversion by connecting multiple bridge type inverter circuits in parallel, and removes harmonic current at the load side of the inverter circuits according to the driving time sequence control of the fully-controlled power electronic devices; meanwhile, aiming at inertial loads such as an alternating current motor, the circuit has the function of energy bidirectional circulation and realizes regenerative feedback braking of energy.
Drawings
Fig. 1 is a schematic diagram of an inverter circuit with multiple bidirectional subharmonic removal in accordance with an embodiment of the present utility model.
Fig. 2 is a timing diagram of the driving trigger control of the fully controlled device according to an embodiment of the present utility model.
Fig. 3 is a theoretical waveform diagram of a load current according to an embodiment of the utility model.
Detailed Description
The technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only embodiments of the present utility model, taking a 3.6s period as an example, removing part of the third harmonic, removing other subharmonics can be adjusted accordingly according to the driving control timing principle, if more subharmonics need to be removed at the same time, only symmetrical bridge arms with the same structure need to be connected in parallel, and the additional bridge arms need to be adjusted in order to control the timing.
1-3, an inverter circuit of current-mode multiple bi-directional removable subharmonic comprises a first circuit and a second circuit, wherein the first circuit comprises a first power supply Ud 1 And a first bridge arm and a second bridge arm connected in parallel with the first power supply, the second circuit including a second power supply Ud 2 And a third bridge arm and a fourth bridge arm which are connected in parallel with the second power supply, wherein the third bridge arm, the first bridge arm, the second bridge arm and the fourth bridge arm are sequentially arranged on the first power supply Ud 1 And a second power supply Ud 2 The first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm respectively comprise two fully-controlled devices which are sequentially connected in series and a reactor which is connected between the two fully-controlled devices in series, neutral points of the reactor in the third bridge arm and the reactor in the first bridge arm are connected with one end of a load M, neutral points of the reactor in the second bridge arm and the reactor in the fourth bridge arm are connected with the other end of the load M, and a first power supply Ud 1 And a second power supply Ud 2 Are all direct current power supplies and are respectively connected in series with an inductor L 1 And L 2 The abrupt change of current at the side of the load M can be effectively reduced, and the harmonic content is reduced.
In the technical scheme, two fully-controlled devices (IGBT, insulated Gate Bipolar Transistor, insulated gate bipolar transistor) V in a first bridge arm 1 And V 2 And two fully-controlled devices V in the second bridge arm 3 And V 4 Forming a single-phase bridge inverter circuit in which the full-control device V is changed 1 、V 2 、V 3 、V 4 The switching-on period can realize the direct current-alternating current inversion function, and the driving control module of the full-control device is the full-control device V in the first half period of 0s-1.8s 1 And V 4 Providing control voltage of 10-15V for grid driving and turning on the fully-controlled device V 1 And V 4 Full control type device V 2 And V 3 The grid voltage is negative 10-15V, which ensures the fully controlled device V 2 And V 3 The voltage at two sides of the load M is high and low from left to right, so that the current flows from left to right, and the driving control module of the fully-controlled device is the fully-controlled device V within the period of 1.8s-3.6s of the second half period 2 And V 3 Providing control voltage of 10-15V for grid driving and turning on the full-control device V 2 And V 3 While the fully-controlled device V 1 And V 4 The gate voltage of (2) is negative 10-15V, ensure V 1 And V 4 The voltage at two sides of the load M is low on the left and high on the right, so that the current flows from the right to the left, and the basic direct current-alternating current inversion function is realized; in order to remove subharmonic, a third bridge arm and a fourth bridge arm are arranged, wherein the third bridge arm is arranged corresponding to the first bridge arm, and the fourth bridge arm is arranged corresponding to the second bridge armThe bridge arms are correspondingly arranged, and meanwhile, when the full-control device is restrained from being opened, current mutation is easy to cause larger loss of the opening power of the device, and the energy efficiency of the system is reduced, therefore, a reactor is connected in series to the midpoint of each bridge arm, and the reactors are respectively LT 1 、LT 2 、LT 3 And LT 4 Reducing di/dt in turn-on process, reducing turn-on loss, LT 1 And LT 3 Is connected to the left end of the AC load M, LT 2 And LT 4 The neutral point of the first power supply is connected to the right end of the alternating current load M, and provides an alternating current power supply for the alternating current load M together; in the single-phase bridge inverter circuit, the output current characteristics are found by Fourier transformation, because the output function is an odd function characteristic, even harmonic is not existed, the output is of odd harmonics of 3, 5, 7, 9 and the like except the fundamental wave, and in order to remove specific odd harmonic, the full-control device V is turned on at the moment of the first half period T/2n 5 And V 8 The full-control device V is turned on at the moment of the later half period T/2n 6 And V 7 The specific n-order harmonic can be removed by multiple current mode through the current superposition principle.
Illustratively, referring to FIGS. 2 and 3, the drive control module of the fully-controlled device is a fully-controlled device V within 0.6s-2.4s of the cycle 5 And V 8 Providing control voltage of 10-15V for grid driving and fully-controlled device V 5 And V 8 Conduction and full control type device V 6 And V 7 The gate voltage of the transistor is negative 10-15V, ensuring a fully controlled device V 6 And V 7 The voltage at two sides of the load M is high and low, and the current flows from left to right.
Illustratively, referring to FIGS. 2 and 3, the drive control module of the fully-controlled device is a fully-controlled device V within 2.4s-4.2s of the cycle 6 And V 7 Providing a control voltage of 10-15V for grid driving and a fully-controlled device V 6 And V 7 Conduction and full control type device V 5 And V 8 The gate voltage of the transistor is negative 10-15V, ensuring a fully controlled device V 5 And V 8 The voltage at two sides of the load M is low at left and high at right, the current flows from right to left, and multiple current type subharmonic removal can be realized through the current superposition principle.
Exemplary, referring to FIGS. 2 and 3, the drive control module is a fully controlled device V, 0s-0.6s in a cycle 1 、V 4 、V 6 And V 7 Providing a gate drive 10-15v control voltage, the load M has no current due to the same value of the voltage, but due to the first power supply Ud 1 And a second power supply Ud 2 Respectively series inductance L 1 And L 2 Current limiting reactor LT 1 、LT 2 、LT 3 And LT 4 The load M-side current increases linearly.
Exemplary, referring to FIGS. 2 and 3, the drive control module is a fully controlled device V, at 0.6s-1.8s in the cycle 1 、V 4 、V 5 And V 8 Providing control voltage of 10-15V for grid driving and fully-controlled device V 1 、V 4 、V 5 And V 8 Conducting, simultaneous, fully controlled device V 2 、V 3 、V 6 And V 7 The grid driving voltage is minus 10-15V, and the full-control device V 2 、V 3 、V 6 And V 7 Reliably turn off, the voltage at the side of the load M is positive and negative, the current of the load M flows from left to right, but due to the first power supply Ud 1 And a second power supply Ud 2 Respectively series inductance L 1 And L 2 Current limiting reactor LT 1 、LT 2 、LT 3 And LT 4 The load M-side current is a constant value.
Illustratively, referring to FIGS. 2 and 3, the drive control module is a fully controlled device V for 1.8s-2.4s in a cycle 2 、V 3 、V 5 And V 8 Providing control voltage of 10-15v for grid driving, and no current is supplied to load M due to the same value of voltage, but the first power supply Ud 1 And a second power supply Ud 2 Respectively series inductance L 1 And L 2 Current limiting reactor LT 1 、LT 2 、LT 3 And LT 4 The load M-side current decreases linearly.
Exemplary, referring to FIGS. 2 and 3, the drive control module is 2.4s-3.6s in a cycleFull control type device V 2 、V 3 、V 6 And V 7 Providing control voltage of 10-15V for grid driving and fully-controlled device V 2 、V 3 、V 6 And V 7 Conducting and fully controlled device V 1 、V 4 、V 5 And V 8 The gate driving voltage of the full-control device V is 10-15V which is negative 1 、V 4 、V 5 And V 8 Reliably turn off, the voltage at the side of the load M is positive and negative, the current of the load M flows from right to left, but due to the first power supply Ud 1 And a second power supply Ud 2 Respectively series inductance L 1 And L 2 Current limiting reactor LT 1 、LT 2 、LT 3 And LT 4 The load M-side current is a constant value.
Illustratively, referring to fig. 1 and 2, the fully controlled devices are each antiparallel connected with a power diode.
In the technical scheme, a fully-controlled device V 1 、V 2 、V 3 、V 4 、V 5 、V 6 、V 7 And V 8 Respectively antiparallel with power diodes VD 1 、VD 2 、VD 3 、VD 4 、VD 5 、VD 6 、VD 7 And VD 8 For some mechanical inertial loads M, such as motor loads, the full control device V can be turned off during motor braking 1 To V 8 The load current passes through the power diode VD 1 To VD 8 The first power Ud is fed back to the DC side and is fed to the DC 1 And a second power supply Ud 2 And charging, so as to realize energy feedback.
In summary, the utility model has simple structure, can remove subharmonics by controlling the turn-on time of the driving circuit in a multiple inversion mode, so as to reduce the adverse effect of the harmonic circuit on the load, can extend and extend to be three times and four times according to actual needs, can remove multiple subharmonics, and can realize energy feedback and energy bidirectional circulation by anti-parallel connection of the power diodes on the full control device of the bridge circuit; the electronic devices in the circuit are symmetrically arranged, are neat and attractive, are simple and convenient to wire, and can effectively remove harmonic components in a common inverter circuit.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely exemplary of the application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the application and are intended to be comprehended within the scope of the application.
Claims (3)
1. The current type multiple bidirectional subharmonic-free inverter circuit is characterized by comprising a first circuit and a second circuit, wherein the first circuit comprises a first power supply, a first bridge arm and a second bridge arm which are connected in parallel with the first power supply, the second circuit comprises a second power supply, a third bridge arm and a fourth bridge arm which are connected in parallel with the second power supply, the third bridge arm, the first bridge arm, the second bridge arm and the fourth bridge arm are sequentially arranged between the first power supply and the second power supply, the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm respectively comprise two fully-controlled devices which are sequentially connected in series and a reactor which is connected in series between the two fully-controlled devices, neutral points of the reactors in the third bridge arm and the first bridge arm are connected to one end of a load, and neutral points of the reactors in the second bridge arm and the fourth bridge arm are connected to the other end of the load.
2. The current-mode multiple bi-directional subharmonic-removable inverter circuit of claim 1, wherein the first power supply and the second power supply are both dc power supplies and are each connected in series with an inductor.
3. The current-mode multiple bi-directional subharmonic-removable inverter circuit of claim 2, wherein each of said fully-controlled devices is antiparallel with a power diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321852774.8U CN220342219U (en) | 2023-07-13 | 2023-07-13 | Current type multiple bidirectional inverter circuit capable of removing subharmonic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321852774.8U CN220342219U (en) | 2023-07-13 | 2023-07-13 | Current type multiple bidirectional inverter circuit capable of removing subharmonic |
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| CN220342219U true CN220342219U (en) | 2024-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321852774.8U Active CN220342219U (en) | 2023-07-13 | 2023-07-13 | Current type multiple bidirectional inverter circuit capable of removing subharmonic |
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| CN (1) | CN220342219U (en) |
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- 2023-07-13 CN CN202321852774.8U patent/CN220342219U/en active Active
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