CN113162449A - Three-level inverter circuit and converter - Google Patents
Three-level inverter circuit and converter Download PDFInfo
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- CN113162449A CN113162449A CN202110495415.0A CN202110495415A CN113162449A CN 113162449 A CN113162449 A CN 113162449A CN 202110495415 A CN202110495415 A CN 202110495415A CN 113162449 A CN113162449 A CN 113162449A
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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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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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
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Abstract
The invention is suitable for the technical field of power supplies, and provides a three-level inverter circuit and a converter, wherein the circuit comprises: and the middle point between the connected switch tubes in one three-level bridge arm is connected with the middle points between the switch tubes at the corresponding positions of other three-level bridge arms. Through the structure, the three-level inverter circuit provided by the application can connect the switching tubes of the same positions of the bridge arms in parallel, so that the problem of uneven current caused by parameter deviation of devices is solved, and the current-sharing characteristic of the circuit is enhanced.
Description
Technical Field
The invention belongs to the technical field of power supplies, and particularly relates to a three-level inverter circuit and a converter.
Background
With the continuous development of solar energy and UPS technology and the continuous expansion of the market, the requirement for inverter efficiency is more and more emphasized by manufacturers, so that a three-level topology structure is generated.
As is well known, compared with a common half-bridge circuit, a three-level inverter circuit has the capability of freewheeling at a connection point, so that the three-level inverter circuit has good effects of improving output ripples and reducing loss. However, due to the influence of parameters of each IGBT device in the three-level inverter circuit, current among loops is inconsistent, and the phenomenon of non-uniform current is caused.
Disclosure of Invention
In view of this, embodiments of the present invention provide a three-level inverter circuit and a converter, so as to solve the problem of non-current-sharing of the three-level inverter circuit in the prior art.
A first aspect of an embodiment of the present invention provides a three-level inverter circuit, including:
at least two I-type three-level bridge arms; each I-type three-level bridge arm comprises a first switch module and a second switch module respectively; each first switch module comprises two switch tubes; each second switch module comprises two switch tubes;
the first end of the first switch module of each I-type three-level bridge arm is connected with the anode of the direct-current bus, the second end of the first switch module of each I-type three-level bridge arm is connected with the first end of the corresponding second switch module, and the second end of the second switch module of each I-type three-level bridge arm is connected with the cathode of the direct-current bus;
two switching tubes in each first switching module are connected in series between the first end and the second end of the first switching module; two switch tubes in each second switch module are connected in series between the first end and the second end of the second switch module;
the connection points between the two switching tubes of each first switching module are connected; the connection points between the two switching tubes of each second switching module are connected; and connecting points between the first switch module and the second switch module of each I-type three-level bridge arm are connected and then connected with the load module.
In one embodiment, each type I three-level leg further includes a first diode and a second diode;
aiming at any I-type three-level bridge arm, the cathode of the first diode of the I-type three-level bridge arm is connected with a connection point between two switch tubes of the first switch module of the I-type three-level bridge arm, the anode of the first diode of the I-type three-level bridge arm is connected with the cathode of the second diode of the I-type three-level bridge arm, and the anode of the second diode of the I-type three-level bridge arm is connected with a connection point between two switch tubes of the second switch module of the I-type three-level bridge arm.
In one embodiment, the three-level inverter circuit further comprises a capacitance module;
the capacitor module is connected between the positive electrode and the negative electrode of the direct current bus; and the connecting point between the first diode and the second diode corresponding to each I-type three-level bridge arm is connected with the midpoint of the capacitor module.
In one embodiment, the capacitance module comprises a first capacitance and a second capacitance; the first end of the first capacitor is connected with the positive electrode of the direct current bus, the second end of the first capacitor is connected with the first end of the second capacitor, the second end of the second capacitor is connected with the negative electrode of the direct current bus, and the connecting end of the first capacitor and the second capacitor is the midpoint of the capacitor module.
In one embodiment, each switching tube is an IGBT tube.
A second aspect of an embodiment of the present invention provides a three-level inverter circuit, including: the circuit comprises a capacitor module and at least two T-shaped three-level bridge arms; each T-shaped three-level bridge arm comprises a first switch module and a second switch module respectively; each first switch module comprises two switch tubes; each second switch module comprises two switch tubes; the capacitor module is connected between the positive electrode and the negative electrode of the direct current bus;
aiming at any T-shaped three-level bridge arm, the first end of a first switch module of the T-shaped three-level bridge arm is connected with the anode of the direct-current bus; the second end of the first switch module of the T-shaped three-level bridge arm is connected with the negative electrode of the direct-current bus, the first end of the second switch module of the T-shaped three-level bridge arm is connected with the midpoint of the capacitor module, and the second end of the second switch module of the T-shaped three-level bridge arm is respectively connected with the midpoint of the first switch module of each T-shaped three-level bridge arm; two switch tubes in a first switch module of the T-shaped three-level bridge arm are connected between a first end and a second end of the first switch module in series, and two switch tubes in a second switch module of the T-shaped three-level bridge arm are connected between a first end and a second end of the second switch module in series;
the connection points between the two switching tubes of each first switching module are connected and then connected into the load module; the connection points between the two switching tubes of the respective second switching modules are connected.
In one embodiment, two switching tubes in each first switching module are connected in series in a forward direction between the first end and the second end of the corresponding first switching module, and two switching tubes in each second switching module are connected in series in a reverse direction between the first end and the second end of the corresponding second switching module.
In one embodiment, the capacitance module comprises a first capacitance and a second capacitance; the first end of the first capacitor is connected with the positive electrode of the direct current bus, the second end of the first capacitor is connected with the first end of the second capacitor, the second end of the second capacitor is connected with the negative electrode of the direct current bus, and the connecting end of the first capacitor and the second capacitor is the midpoint of the capacitor module.
In one embodiment, each switching tube is an IGBT tube.
A third aspect of embodiments of the present invention provides a converter comprising a three-level inverter circuit as described in the first or second aspect.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the three-level inverter circuit provided by the embodiment comprises: and the middle point between the connected switch tubes in one three-level bridge arm is connected with the middle points between the switch tubes at the corresponding positions of other three-level bridge arms. Through the structure, the three-level inverter circuit can connect the switching tubes at the same position of each bridge arm in parallel, so that the problem of uneven current caused by parameter deviation of devices is solved, and the current-sharing characteristic of the circuit is enhanced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic circuit diagram of a three-level inverter circuit according to an embodiment of the present invention;
fig. 2 is another circuit diagram of a three-level inverter circuit according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
In one embodiment, as shown in fig. 1, fig. 1 shows a schematic diagram of a three-level inverter circuit provided in an embodiment of the present invention, which includes:
at least two I-type three-level bridge arms; each I-type three-level bridge arm comprises a first switch module and a second switch module respectively; each first switch module comprises two switch tubes; each second switch module comprises two switch tubes;
the first end of the first switch module of each I-type three-level bridge arm is connected with the anode of the direct-current bus, the second end of the first switch module of each I-type three-level bridge arm is connected with the first end of the corresponding second switch module, and the second end of the second switch module of each I-type three-level bridge arm is connected with the cathode of the direct-current bus;
two switching tubes in each first switching module are connected in series between the first end and the second end of the first switching module; two switch tubes in each second switch module are connected in series between the first end and the second end of the second switch module;
the connection points between the two switching tubes of each first switching module are connected; the connection points between the two switching tubes of each second switching module are connected; and connecting points between the first switch module and the second switch module of each I-type three-level bridge arm are connected and then connected with the load module.
In the present embodiment, an inversion topology with three I-type three-level bridge arms connected in parallel is shown in fig. 1. As shown in fig. 1, the first switch module of the type I three-level bridge arm a includes switch tubes T1a and T2a, and the second switch module includes T3a and T4 a; diodes D1a and D2a are also included. The three-phase inverter circuit is characterized in that T1a, T2a, T3a and T4a are connected in series, the source of T1a is connected with the positive electrode of a direct current bus, the drain of T4a is connected with the negative electrode of the direct current bus, the negative electrode of a diode D1a is connected with the drain of T1a, the positive electrode of a diode D1a is connected with the negative electrode of a diode D2a, and the positive electrode of a diode D2a is connected with the drain of a switching tube T3 a. The first switch module of the I-type three-level bridge arm b comprises switch tubes T1b and T2b, and the second switch module comprises T3b and T4 b; diodes D1b and D2b are also included. The three-phase inverter circuit is characterized in that T1b, T2b, T3b and T4b are connected in series, the source of T1b is connected with the positive electrode of a direct current bus, the drain of T4b is connected with the negative electrode of the direct current bus, the negative electrode of a diode D1b is connected with the drain of T1b, the positive electrode of a diode D1b is connected with the negative electrode of a diode D2b, and the positive electrode of a diode D2b is connected with the drain of a switching tube T3 b. The first switch module of the I-type three-level bridge arm c comprises switch tubes T1c and T2c, and the second switch module comprises T3c and T4 c; diodes D1c and D2c are also included. The three-phase inverter circuit is characterized in that T1c, T2c, T3c and T4c are connected in series, the source of T1c is connected with the positive electrode of a direct current bus, the drain of T4c is connected with the negative electrode of the direct current bus, the negative electrode of a diode D1c is connected with the drain of T1c, the positive electrode of a diode D1c is connected with the negative electrode of a diode D2c, and the positive electrode of a diode D2c is connected with the drain of a switching tube T3 c.
In one embodiment, each type I three-level leg further includes a first diode and a second diode;
aiming at any I-type three-level bridge arm, the cathode of the first diode of the I-type three-level bridge arm is connected with a connection point between two switch tubes of the first switch module of the I-type three-level bridge arm, the anode of the first diode of the I-type three-level bridge arm is connected with the cathode of the second diode of the I-type three-level bridge arm, and the anode of the second diode of the I-type three-level bridge arm is connected with a connection point between two switch tubes of the second switch module of the I-type three-level bridge arm.
In one embodiment, the capacitor module is connected between the positive electrode and the negative electrode of the direct current bus; and the connecting point between the first diode and the second diode corresponding to each I-type three-level bridge arm is connected with the midpoint of the capacitor module.
In one embodiment, as shown in fig. 1, the capacitance module includes a first capacitance C1 and a second capacitance C2; a first end of the first capacitor C1 is connected to the positive electrode of the dc bus, a second end of the first capacitor C1 is connected to a first end of the second capacitor C2, a second end of the second capacitor C2 is connected to the negative electrode of the dc bus, and a connection end between the first capacitor C1 and the second capacitor C2 is a midpoint O of the capacitor module.
In this embodiment, based on the original three-level inversion topology, the drains of the switching tubes T1a, T1b, and T1c are connected, so that the voltage drops of T1a, T1b, and T1c are the same, the drains of the switching tubes T2a, T2b, and T2c are connected, so that the voltage drops of T2a, T2b, and T2c are the same, and the drains of the switching tubes T3a, T3b, and T3c are connected, so that the voltage drops of T3a, T3b, and T3c are the same, thereby improving the current sharing characteristic.
The control process of the three-level inverter circuit provided by the embodiment is the same as that of the existing I-type three-level inverter circuit.
Specifically, in this embodiment, an I-type three-level bridge arm a is taken as an example, the operating principle of the main circuit of the three-level inverter is analyzed, and a direction in which the load current flows from the inverter to the load is defined as a positive direction.
(1) When T1a and T2a are turned on and T3a and T4a are turned off,when the load current is in the positive direction, the capacitor C1 discharges, a current flows from the positive electrode point through the main switches T1a and T2a, the phase output terminal potential is equal to the positive electrode point potential, and the output voltage U is equal to Vdc2; if the load current is in a negative direction, the current flows through a freewheeling diode D1a connected in anti-parallel with the main switching tubes T1a and T2a to charge the capacitor C1, the current is injected into the positive pole, the output end potential of the phase is still equal to the positive pole potential, and the output voltage U is equal to Vdc/2。
(2) When T2a and T3a are turned on and T1a and T4a are turned off, if the load current is in the positive direction, the current flows through the box diode D1a and the main switching tube T2a in sequence from point O, and the output voltage U is 0; if the load current is in the negative direction, the current flows through the main switching tube T3a and the tank diode D2a in sequence, the current is injected into point O, the phase output voltage U becomes 0, and the power supply charges the capacitor C2.
(3) When T3a and T4a are turned on and T1a and T2a are turned off, if the load current is in the positive direction, current flows from the negative point through a freewheeling diode connected in anti-parallel with the main switches T3a and T4a to charge the capacitor C2, and the phase output terminal potential is equal to the negative point potential output voltage U-Vdc2; if the load current is in a negative direction, the power supply charges the capacitor C2, the current flows through the main switching tubes T3a and T4a and is injected into a negative point, the output end potential of the phase is still equal to the negative point potential, and the output voltage U is equal to-Vdc/2。
As can be seen from the foregoing embodiments, the three-level inverter circuit provided in this embodiment includes: at least two I-type three-level bridge arms; each I-type three-level bridge arm comprises four switching tubes connected in series; the at least two I-shaped three-level bridge arms are connected in parallel and then connected between the positive electrode and the negative electrode of the direct current bus; the first connecting points corresponding to the I-type three-level bridge arms are connected, and the first connecting points are connecting points between any adjacent switch tubes in the I-type three-level bridge arms; and the connection points of the I-type three-level bridge arms are connected and then connected with the load module. Through the structure, the three-level inverter circuit can connect the switching tubes at the same position of each bridge arm in parallel, so that the problem of uneven current caused by parameter deviation of devices is solved, and the current-sharing characteristic of the circuit is enhanced.
In one embodiment, each diode is a silicon carbide diode.
In one embodiment, each switching tube is an IGBT tube.
In one embodiment, the connection points between the switching tubes at the corresponding positions of the I-shaped three-level bridge arms are connected through copper bars.
In one embodiment, as shown in fig. 2, fig. 2 is a schematic diagram of another three-level inverter circuit provided in an embodiment of the present invention, which includes:
the circuit comprises a capacitor module and at least two T-shaped three-level bridge arms; each T-shaped three-level bridge arm comprises a first switch module and a second switch module respectively; each first switch module comprises two switch tubes; each second switch module comprises two switch tubes; the capacitor module is connected between the positive electrode and the negative electrode of the direct current bus;
aiming at any T-shaped three-level bridge arm, the first end of a first switch module of the T-shaped three-level bridge arm is connected with the anode of the direct-current bus; the second end of the first switch module of the T-shaped three-level bridge arm is connected with the negative electrode of the direct-current bus, the first end of the second switch module of the T-shaped three-level bridge arm is connected with the midpoint of the capacitor module, and the second end of the second switch module of the T-shaped three-level bridge arm is respectively connected with the midpoint of the first switch module of each T-shaped three-level bridge arm; two switch tubes in a first switch module of the T-shaped three-level bridge arm are connected between a first end and a second end of the first switch module in series, and two switch tubes in a second switch module of the T-shaped three-level bridge arm are connected between a first end and a second end of the second switch module in series;
the connection points between the two switching tubes of each first switching module are connected and then connected into the load module; the connection points between the two switching tubes of the respective second switching modules are connected.
In one embodiment, two switching tubes in each first switching module are connected in series in a forward direction between the first end and the second end of the corresponding first switching module, and two switching tubes in each second switching module are connected in series in a reverse direction between the first end and the second end of the corresponding second switching module.
In this embodiment, as shown in fig. 2, the first switch module of the T-type three-level bridge arm a in fig. 2 includes a switch transistor T1a and a switch transistor T2a, and the second switch module includes a switch transistor T3a and a switch transistor T4 a; the first switch module of the T-shaped bridge arm b comprises a switch tube T1b and a switch tube T2b, and the second switch module comprises a switch tube T3b and a switch tube T4 b; the first switch module of the T-shaped three-level bridge arm c comprises a switch tube T1c and a switch tube T2c, and the second switch module comprises a switch tube T3c and a switch tube T4 c; the source electrode of the switch tube T1a is connected with the positive electrode of the direct current bus, the drain electrode of the switch tube T1a is connected with the source electrode of the switch tube T2a, and the drain electrode of the switch tube T2a is connected with the negative electrode of the direct current bus; the drain electrode of the switch tube T3a is connected with the midpoint of the capacitor module, and the source electrode of the switch tube T3a is connected with the source electrode of the switch tube T4 a; the source electrode of the switch tube T1b is connected with the positive electrode of the direct current bus, the drain electrode of the switch tube T1b is connected with the source electrode of the switch tube T2b, and the drain electrode of the switch tube T2b is connected with the negative electrode of the direct current bus; the drain electrode of the switch tube T3b is connected with the midpoint of the capacitor module, the source electrode of the switch tube T3b is connected with the source electrode of the switch tube T4b, the source electrode of the switch tube T1c is connected with the positive electrode of the direct current bus, the drain electrode of the switch tube T1c is connected with the source electrode of the switch tube T2c, and the drain electrode of the switch tube T2c is connected with the negative electrode of the direct current bus; the drain electrode of the switch tube T3c is connected with the midpoint of the capacitor module, and the source electrode of the switch tube T3c is connected with the source electrode of the switch tube T4 c; after the drain of the switching tube T4a, the drain of the switching tube T4b, and the drain of the switching tube T4c are connected, the connection points are respectively connected to the midpoints of the first switching modules of the respective bridge arms.
Specifically, the drain of the switch tube T1a, the drain of the switch tube T1b and the drain of the switch tube T1c are connected, so that voltage drops of T1a, T1b and T1c are consistent, the source of the switch tube T3a, the source of the switch tube T3b and the source of the switch tube T3c are connected, so that voltage drops of T3a, T3b and T3c are consistent, and therefore the current sharing characteristic is improved.
In one embodiment, the capacitance module comprises a first capacitance and a second capacitance; the first end of the first capacitor is connected with the positive electrode of the direct current bus, the second end of the first capacitor is connected with the first end of the second capacitor, the second end of the second capacitor is connected with the negative electrode of the direct current bus, and the connecting end of the first capacitor and the second capacitor is the midpoint of the capacitor module.
In one embodiment, each switching tube is an IGBT tube.
The embodiment of the invention provides a converter which comprises the T-type three-level inverter circuit or the I-type three-level inverter circuit.
In this embodiment, if the three-level inverter circuit is an I-type three-level inverter circuit, the output end thereof is the midpoint of the I-type three-level bridge arm, and if the three-level inverter circuit is a T-type three-level inverter circuit, the output end thereof is the midpoint of each first switch module in the T-type three-level bridge arm.
As can be seen from the foregoing embodiments, the three-level inverter circuit provided in this embodiment includes: and the middle point between the connected switch tubes in one three-level bridge arm is connected with the middle points between the switch tubes at the corresponding positions of other three-level bridge arms. Through the structure, the three-level inverter circuit can connect the switching tubes at the same position of each bridge arm in parallel, so that the problem of uneven current caused by parameter deviation of devices is solved, and the current-sharing characteristic of the circuit is enhanced.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A three-level inverter circuit, comprising: at least two I-type three-level bridge arms; each I-type three-level bridge arm comprises a first switch module and a second switch module respectively; each first switch module comprises two switch tubes; each second switch module comprises two switch tubes;
the first end of the first switch module of each I-type three-level bridge arm is connected with the anode of the direct-current bus, the second end of the first switch module of each I-type three-level bridge arm is connected with the first end of the corresponding second switch module, and the second end of the second switch module of each I-type three-level bridge arm is connected with the cathode of the direct-current bus;
two switching tubes in each first switching module are connected in series between the first end and the second end of the first switching module; two switch tubes in each second switch module are connected in series between the first end and the second end of the second switch module;
the connection points between the two switching tubes of each first switching module are connected; the connection points between the two switching tubes of each second switching module are connected; and connecting points between the first switch module and the second switch module of each I-type three-level bridge arm are connected and then connected with the load module.
2. The three-level inverter circuit according to claim 1, wherein each type I three-level leg further comprises a first diode and a second diode;
aiming at any I-type three-level bridge arm, the cathode of the first diode of the I-type three-level bridge arm is connected with a connection point between two switch tubes of the first switch module of the I-type three-level bridge arm, the anode of the first diode of the I-type three-level bridge arm is connected with the cathode of the second diode of the I-type three-level bridge arm, and the anode of the second diode of the I-type three-level bridge arm is connected with a connection point between two switch tubes of the second switch module of the I-type three-level bridge arm.
3. The three-level inverter circuit according to claim 2, wherein the three-level inverter circuit further comprises a capacitance module;
the capacitor module is connected between the positive electrode and the negative electrode of the direct current bus; and the connecting point between the first diode and the second diode corresponding to each I-type three-level bridge arm is connected with the midpoint of the capacitor module.
4. The three-level inverter circuit according to claim 3, wherein the capacitance module comprises a first capacitance and a second capacitance; the first end of the first capacitor is connected with the positive electrode of the direct current bus, the second end of the first capacitor is connected with the first end of the second capacitor, the second end of the second capacitor is connected with the negative electrode of the direct current bus, and the connecting end of the first capacitor and the second capacitor is the midpoint of the capacitor module.
5. The three-level inverter circuit according to claim 1, wherein each switching tube is an IGBT tube.
6. A three-level inverter circuit, comprising: the circuit comprises a capacitor module and at least two T-shaped three-level bridge arms; each T-shaped three-level bridge arm comprises a first switch module and a second switch module respectively; each first switch module comprises two switch tubes; each second switch module comprises two switch tubes; the capacitor module is connected between the positive electrode and the negative electrode of the direct current bus;
aiming at any T-shaped three-level bridge arm, the first end of a first switch module of the T-shaped three-level bridge arm is connected with the anode of the direct-current bus; the second end of the first switch module of the T-shaped three-level bridge arm is connected with the negative electrode of the direct-current bus, the first end of the second switch module of the T-shaped three-level bridge arm is connected with the midpoint of the capacitor module, and the second end of the second switch module of the T-shaped three-level bridge arm is respectively connected with the midpoint of the first switch module of each T-shaped three-level bridge arm; two switch tubes in a first switch module of the T-shaped three-level bridge arm are connected between a first end and a second end of the first switch module in series, and two switch tubes in a second switch module of the T-shaped three-level bridge arm are connected between a first end and a second end of the second switch module in series;
the connection points between the two switching tubes of each first switching module are connected and then connected into the load module; the connection points between the two switching tubes of the respective second switching modules are connected.
7. The three-level inverter circuit according to claim 6, wherein two switching tubes of each first switching module are connected in series in a forward direction between the first terminal and the second terminal of the corresponding first switching module, and two switching tubes of each second switching module are connected in series in an inverse direction between the first terminal and the second terminal of the corresponding second switching module.
8. The three-level inverter circuit according to claim 6, wherein the capacitance module comprises a first capacitance and a second capacitance; the first end of the first capacitor is connected with the positive electrode of the direct current bus, the second end of the first capacitor is connected with the first end of the second capacitor, the second end of the second capacitor is connected with the negative electrode of the direct current bus, and the connecting end of the first capacitor and the second capacitor is the midpoint of the capacitor module.
9. The three-level inverter circuit according to claim 6, wherein each switching tube is an IGBT tube.
10. A converter comprising a three-level inverter circuit according to any one of claims 1 to 5 or a three-level inverter circuit according to any one of claims 6 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110495415.0A CN113162449A (en) | 2021-05-07 | 2021-05-07 | Three-level inverter circuit and converter |
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