CN114944778A - Single-phase inverter circuit and single-phase inverter - Google Patents
Single-phase inverter circuit and single-phase inverter Download PDFInfo
- Publication number
- CN114944778A CN114944778A CN202210659215.9A CN202210659215A CN114944778A CN 114944778 A CN114944778 A CN 114944778A CN 202210659215 A CN202210659215 A CN 202210659215A CN 114944778 A CN114944778 A CN 114944778A
- Authority
- CN
- China
- Prior art keywords
- bridge arm
- midpoint
- phase inverter
- capacitor
- inductor
- 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
Images
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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The application discloses a single-phase inverter circuit, a single-phase inverter and a direct current source; the inverter bridge comprises a first bridge arm and a second bridge arm, the first bridge arm is respectively connected with the anode and the cathode of the direct current source, and the second bridge arm is respectively connected with the anode and the cathode of the direct current source; the bus capacitor is respectively connected with the positive electrode and the negative electrode of the direct current source; the first input end of the filtering module is connected with the midpoint of the bus capacitor, the second input end of the filtering module is connected with the midpoint of the first bridge arm, the third input end of the filtering module is connected with the midpoint of the second bridge arm, and the filtering module is used for filtering voltages among the midpoint of the bus capacitor, the midpoint of the first bridge arm and the midpoint of the first bridge arm so as to output target alternating-current voltages of different voltage levels. According to the technical scheme, the power density of the multistage power supply equipment is improved while the power supply requirements of different voltage grades are met.
Description
Technical Field
The application relates to the technical field of inverters, in particular to a single-phase inverter circuit and a single-phase inverter.
Background
The electrical equipment often needs power supply of different voltage levels, for example, 380V and 220V power supply, and at present, multi-stage power supply is usually adopted to meet the power supply requirements of different voltage levels, for example, the power supply form of a single-phase inverter plus a transformer or the power supply form of a three-phase inverter, but at present, the overall size of the power supply equipment in the multi-stage power supply mode is large, and therefore, the power density of the multi-stage power supply equipment is low.
Disclosure of Invention
The main purpose of this application is to provide a single-phase inverter circuit, when aiming at satisfying the power supply demand of different voltage classes, promotes the power density of multistage formula power supply unit.
To achieve the above object, the present application proposes a single-phase inverter circuit including:
a direct current source;
the inverter bridge comprises a first bridge arm and a second bridge arm, the first bridge arm is respectively connected with the anode and the cathode of the direct current source, and the second bridge arm is respectively connected with the anode and the cathode of the direct current source;
the bus capacitor is respectively connected with the positive electrode and the negative electrode of the direct current source;
the first input end of the filtering module is connected with the midpoint of the bus capacitor, the second input end of the filtering module is connected with the midpoint of the first bridge arm, the third input end of the filtering module is connected with the midpoint of the second bridge arm, and the filtering module is used for filtering voltages among the midpoint of the bus capacitor, the midpoint of the first bridge arm and the midpoint of the first bridge arm so as to output target alternating-current voltages of different voltage levels.
Optionally, the bus capacitor includes a first capacitor and a second capacitor connected in series, the first capacitor is connected to the positive electrode of the dc source and the second capacitor, respectively, and one end of the second capacitor opposite to the first capacitor is connected to the negative electrode of the dc source.
Optionally, the capacitance value of the first capacitor and the capacitance value of the second capacitor are equal.
Optionally, the single-phase inverter circuit further includes a modulation module, a first output end of the modulation module is connected to the first bridge arm, and is configured to input a first control signal generated according to a first preset modulation wave to the first bridge arm so as to control a switching operation of the switching element group in the first bridge arm, and a second output end of the modulation module is connected to the second bridge arm, and is configured to input a second control signal generated according to a second preset modulation wave to the second bridge arm so as to control a switching operation of the switching element group in the second bridge arm.
Optionally, a phase of the first preset modulation wave is different from a phase of the second preset modulation wave.
Optionally, the target ac voltages of different voltage levels include a first target ac voltage, a second target ac voltage, and a third target ac voltage, a modulation ratio of the first preset modulation wave and a modulation ratio of the second preset modulation wave are used together to control a voltage level of the first target ac voltage and a voltage level of the second target ac voltage, and a phase difference between the first preset modulation wave and the second preset modulation wave is used to control a voltage level of the third target ac voltage obtained by superimposing the first target ac voltage and the second target ac voltage.
Optionally, the filtering module is any one of the following filtering circuits: the circuit comprises an L filter circuit, an LC filter circuit and an LCL filter circuit.
Optionally, the LC filter circuit includes a first inductor, a second inductor, a third capacitor, and a fourth capacitor, where one end of the first inductor is used as the first input end of the filter module, one end of the second inductor is used as the second input end of the filter module, one end of the third inductor is used as the third input end of the filter module, the third capacitor is connected to the other end of the first inductor and the other end of the second inductor, the fourth capacitor is connected to the other end of the second inductor and the other end of the third inductor, and target ac voltages of different voltage levels are formed between the other end of the first inductor, the other end of the second inductor, and the other end of the third inductor.
Optionally, the first bridge arm is formed by connecting a first switching element group and a second switching element group in series, and the second bridge arm is formed by connecting a third switching element group and a fourth switching element group in series.
In order to achieve the above object, the present application further provides a control method of a single-phase inverter circuit, where the single-phase inverter circuit includes an inverter bridge, a filter module, and a dc source, the inverter bridge includes a first bridge arm and a second bridge arm, the first bridge arm is connected to an anode and a cathode of the dc source, the second bridge arm is connected to an anode and a cathode of the dc source, the single-phase inverter circuit further includes a bus capacitor, the bus capacitor is connected to an anode and a cathode of the dc source, a first input end of the filter module is connected to a midpoint of the bus capacitor, a second input end of the filter module is connected to a midpoint of the first bridge arm, and a third input end of the filter module is connected to a midpoint of the second bridge arm, and the control method of the single-phase inverter circuit includes:
acquiring a first control signal and a second control signal, wherein the first control signal is generated by a modulation module according to a first preset modulation wave, and the second control signal is generated by the modulation module according to a second preset modulation wave;
controlling the switching action of the switching element group of the first bridge arm according to the first control signal, and controlling the switching action of the switching element group of the second bridge arm according to the second control signal so as to generate initial alternating-current voltages with different voltage levels among the midpoint of the bus capacitor, the midpoint of the first bridge arm and the midpoint of the first bridge arm;
and filtering the initial alternating voltages with different voltage grades through the filtering module to obtain target alternating voltages with different voltage grades.
In order to achieve the above object, the present application further provides a single-phase inverter, which includes the above single-phase inverter circuit, and specific reference is made to the above, and details are not repeated here.
According to the technical scheme, a single-phase inverter circuit is formed by arranging a direct current source, an inverter bridge, a bus capacitor, a filter module and the like, wherein a first input end of the filter module is connected with a midpoint of the bus capacitor, a second input end of the filter module is connected with the midpoint of the first bridge arm, and a third input end of the filter module is connected with the midpoint of the second bridge arm, so that a circuit structure similar to a three-phase structure is constructed in the single-phase inverter circuit, and after the filter module filters voltages among the midpoint of the bus capacitor, the midpoint of the first bridge arm and the midpoint of the first bridge arm, target alternating current voltages with different voltage levels can be output, compared with the power supply form of the existing single-phase inverter and a transformer, the power supply of the target alternating current voltages with different voltage levels can be provided without arranging the transformer, compared with the existing power supply form of the three-phase inverter, the number of bridge arms in the inverter bridge is reduced, and the target alternating-current voltage power supply with different voltage levels can be provided without arranging the three-phase inverter bridge, so that the overall volume of the multi-stage power supply equipment is reduced, and the power density of the multi-stage power supply equipment is improved while the power supply requirements with different voltage levels are met.
Drawings
In order to more clearly illustrate the embodiments of the present application 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 below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a functional block diagram of a single-phase inverter circuit when a filter module is an LC filter circuit in the present application;
fig. 2 is a functional block diagram of a single-phase inverter circuit when the filter module is an L filter circuit according to the present application;
fig. 3 is a schematic circuit structure diagram of a multi-stage power supply device corresponding to a power supply form of a current single-phase inverter and a transformer;
fig. 4 is a schematic circuit structure diagram of a multistage power supply device corresponding to a power supply form of a current three-phase inverter;
fig. 5 is a schematic circuit diagram of a single-phase inverter circuit including a modulation module according to the present application;
fig. 6 is a flowchart illustrating a control method of the single-phase inverter circuit according to an embodiment of the present disclosure.
The implementation, functional features and advantages of the object of the present application will be further explained with reference to the embodiments, and with reference to the accompanying drawings.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | First bridge arm | C1 | |
| 200 | Second bridge arm | C2 | Second capacitor |
| U dc | Direct current source | C3 | Third capacitor |
| S1 | First switch element group | C4 | Fourth capacitor |
| S2 | The second switch element group | L1 | First inductor |
| S3 | Third switch element group | L2 | Second inductor |
| S4 | Fourth switch element group | L3 | Third inductor |
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that all the directional indications (such as up, down, left, right, front, and rear … …) in the embodiment of the present application are only used to explain the relative position relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indication is changed accordingly.
In addition, the descriptions referred to as "first", "second", etc. in this application are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope claimed in the present application.
To solve the problem that the overall size of the conventional power supply device in a multi-stage power supply mode is large, and therefore the power density of the multi-stage power supply device is low, the single-phase inverter circuit is provided by the application, referring to fig. 1, in an embodiment of the application, the single-phase inverter circuit comprises a main power module and a filtering module, and the main power module comprises a direct current source U dc The inverter bridge and the bus capacitor.
In this embodiment, the inverter bridge includes a first arm 100 and a second arm 200, the first arm 100 and the second arm 200 are connected in parallel, and the first arm 100 is connected to a dc source U respectively dc And the second bridge arm 200 is respectively connected with a direct current source U dc A positive electrode and a negative electrode of (1); the bus capacitors are respectively connected with a direct current source U dc A positive electrode and a negative electrode of (1); the filter module has a first input end N, a second input end R, and a third input end S, where the first input end N of the filter module is connected to the midpoint N 'of the bus capacitor, the second input end of the filter module is connected to the midpoint R of the first bridge arm 100, and the third input end S of the filter module is connected to the midpoint S' of the second bridge arm 200.
In this embodiment, the filtering module is any one of the following filtering circuits: the circuit comprises an L filter circuit, an LC filter circuit and an LCL filter circuit.
As an example, referring to fig. 1, the LC filter circuit includes a first inductor L1, a second inductor L2, a third inductor L3, a third capacitor C4, and a fourth capacitor C5, wherein one end of the first inductor L1 serves as a first input end of the filter module, one end of the second inductor L2 serves as a second input end of the filter module, one end of the third inductor L3 serves as a third input end of the filter module, the third capacitor C3 connects the other end of the first inductor with the other end of the second inductor, the fourth capacitor C4 connects the other end of the second inductor with the other end of the third inductor, and target ac voltages of different voltage levels are formed among the other ends of the first inductor L1, the second inductor L2, and the other end of the third inductor L3.
As an example, referring to fig. 2, the L filter circuit includes a first inductor L1, a second inductor L2, and a third inductor L3, one end of the first inductor L1 is used as a first input end of the filter module, one end of the second inductor L2 is used as a second input end of the filter module, one end of the third inductor L3 is used as a third input end of the filter module, and target ac voltages of different voltage levels are formed among the other end of the first inductor L1, the other end of the second inductor L2, and the other end of the third inductor L3.
In this embodiment, the bus capacitor includes a first capacitor C1 and a second capacitor C2 connected in series, and the first capacitor C1 is connected to the dc source U respectively dc Is connected with a second capacitor C2, and one end of the second capacitor C2 opposite to the first capacitor C1 is connected with the direct current source U dc The capacitance value of the first capacitor C1 and the capacitance value of the second capacitor C2 may be set to be equal, as an example.
In this embodiment, the first arm 100 is formed by connecting the first switching element group S1 and the third switching element group S3 in series, the second arm 200 is formed by connecting the second switching element group S2 and the fourth switching element group S4 in series, and the dc source U can be generated by controlling the switching operation of the first switching element group S1, the second switching element group S2, the third switching element group S3, and the fourth switching element group S4 dc The output direct current is converted into alternating current. When the first switching element group S1 and the second switching element group S2 are turned on and the third switching element group S3 and the fourth switching element group S4 are turned off, the voltage V between the midpoint R 'of the first leg 100 and the midpoint N' of the bus capacitor R’N’ Udc/2, the voltage V between the midpoint S 'of the second leg 200 and the midpoint N' of the bus capacitance S’N’ Is Udc/2; when the first switch element group S1 and the second switch element groupWhen the group S2 is turned off and the third and fourth groups S3, S4 are turned on, the voltage V between the midpoint R 'of the first leg 100 and the midpoint N' of the bus capacitance R’N’ is-Udc/2, the voltage V between the midpoint S 'of the second leg 200 and the midpoint N' of the bus capacitance S’N’ is-Udc/2.
As an example, the SPWM wave may be constructed by controlling switching actions of the first, second, third and fourth switching element groups S1, S2, S3 and S4 by a preset modulation method, so that the output target ac voltage of a desired voltage level is output after filtering by the filtering module.
In this embodiment, the filtering module further has a first output end N, a second output end R and a third output end S. The voltage V between the midpoint R 'of the first leg 100 and the midpoint N' of the bus capacitor is filtered by a filter module R’N’ After filtering, the output target alternating voltage V with the first voltage grade is obtained RN I.e. the voltage between the second output terminal R and the first output terminal N of the filter module; the voltage V between the midpoint S 'of the second bridge arm 200 and the midpoint N' of the bus capacitor is filtered by a filter module S’N’ After filtering, the output target alternating voltage V with the first voltage level is obtained SN I.e. the voltage between the third output terminal S and the first output terminal N of the filter module; further output voltage V RN And an output voltage V SN The output target alternating voltage with the second voltage grade, namely the voltage V between the second output end R and the third output end S of the filter module can be obtained by superposition RS Thereby, the output target alternating voltage of the no-voltage level is output by using the single-phase inverter circuit.
In the embodiment, the bus midpoint is led out on the basis of single-phase full-bridge inversion, the three-phase voltage is constructed by combining the filtering module, compared with the power supply form of adding the transformer to the single-phase inverter shown in fig. 3, three-phase power supplies with different voltage levels can be provided without arranging the transformer, and compared with the power supply form of the three-phase inverter shown in fig. 4, the number of bridge arms of an inverter bridge of the single-phase inverter circuit is less in the embodiment of the power supply method, the three-phase power supplies with different voltage levels can be realized, so that the volume of the whole power supply equipment in a multi-stage power supply mode is reduced on the basis of ensuring the three-phase power supplies with different voltage levels, the power density of the multi-stage power supply equipment is improved, and the cost of the multi-stage power supply equipment is reduced.
Further, referring to fig. 5, the single-phase inverter circuit further includes a modulation module.
In this embodiment, the modulation module includes a first operational amplifier and a second operational amplifier, an output end of the first operational amplifier is respectively connected to the first switching element group S1 of the first bridge arm 100 and the third switching element group S3 of the first bridge arm 100, and an output end of the second operational amplifier is respectively connected to the second switching element group S2 of the second bridge arm 200 and the fourth switching element group S4 of the second bridge arm 200.
In this embodiment, the first preset modulation wave and the triangular wave are input to the first operational amplifier through the input end of the first operational amplifier, the first operational amplifier generates the first control signal by comparing the first preset modulation wave and the triangular wave, and the first control signal flows to the first switching element group S1 and the third switching element group S3 of the first arm 100 through the output end of the first operational amplifier, thereby controlling the switching operation of the first switching element group S1 and the third switching element group S3 of the first arm 100. The second preset modulation wave and the triangular wave are input into the second operational amplifier through the input end of the second operational amplifier, the second operational amplifier generates a second control signal by comparing the second preset modulation wave and the triangular wave, and the second control signal flows to the second switching element group S2 and the fourth switching element group S4 of the second bridge arm 200 through the output end of the second operational amplifier, so that the switching operation of the second switching element group S2 and the fourth switching element group S4 of the second bridge arm 200 is controlled.
In this embodiment, the first preset modulation wave and the triangular wave have a first modulation ratio therebetween, the second preset modulation wave and the triangular wave have a second modulation ratio therebetween, the first modulation ratio and the second modulation ratio can be set to be the same, and the output voltage V can be controlled by controlling the magnitude of the first modulation ratio and the magnitude of the second modulation ratio SN And an output voltage V RN Voltage class of (d); the phase difference between the first preset modulation wave and the second preset modulation wave can be set, and the output voltage V can be controlled by controlling the phase difference between the first preset modulation wave and the second preset modulation wave SN And an output voltage V RN Output voltage V obtained after superposition RS The size of (2).
As an example, assume a DC source U dc 700V, first preset modulation wave
Second preset modulation wave
Phase difference between first preset modulation wave and second preset modulation wave
The first modulation ratio and the second modulation ratio are both 311/350, so that the output voltage V SN Has a peak voltage of 311V, an effective voltage of 220V, and an output voltage V RN Has a peak voltage of 311V, an effective voltage of 220V, and an output voltage V RS ＝V SN *sin(ΔP)+V RN Sin (Δ P), so that the output voltage V RS The peak voltage of (2) is 539V, and the effective voltage is 380V. Therefore, in the present embodiment, under the condition that the voltage and the modulation ratio of the dc source are not changed, the output voltage V can be adjusted by adjusting the phase difference between the first preset modulation wave and the second preset modulation wave RS The single-phase inverter in this embodiment can provide output voltages of various voltage levels, and the magnitude of the voltage level of the output voltage can be controlled by adjusting the modulation ratio corresponding to the first preset modulation wave, the modulation ratio corresponding to the second preset modulation wave, and the phase difference between the first preset modulation wave and the second preset modulation wave under the condition that the output voltage of the direct-current source is not changed.
Based on the single-phase inverter circuit, the application also provides a control method of the single-phase inverter circuit.
Referring to fig. 6 in combination with fig. 1 to 5, in an embodiment, a control method of the single-phase inverter circuit includes:
step S10, obtaining a first control signal and a second control signal, where the first control signal is generated by the modulation module according to a first preset modulation wave, and the second control signal is generated by the modulation module according to a second preset modulation wave;
step S20, controlling switching operations of the switching element group of the first bridge arm according to the first control signal, and controlling switching operations of the switching element group of the second bridge arm according to the second control signal, so as to generate initial ac voltages of different voltage classes among the midpoint of the bus capacitor, the midpoint of the first bridge arm, and the midpoint of the first bridge arm;
and step S30, filtering the initial alternating-current voltages with different voltage grades through the filtering module to obtain target alternating-current voltages with different voltage grades.
As one example, steps S10 to S30 include: generating a first control signal by inputting the first preset modulation wave and the triangular wave to a first operational amplifier of the modulation module, and generating a second control signal by inputting the second preset modulation wave and the triangular wave to a second operational amplifier of the modulation module; the method comprises the steps of controlling the switching actions of a first switching element group S1 and a third switching element group S3 in a first bridge arm 100 by transmitting a first control signal to the first bridge arm 100, and controlling the switching actions of a second switching element group S2 and a fourth switching element group S4 in a second bridge arm 200 by transmitting a second control signal to the second bridge arm 200 so as to control an inverter bridge to convert direct current output by a direct current source into alternating current, so that initial alternating current voltages with different voltage levels are generated among a midpoint of a bus capacitor, a midpoint of the first bridge arm 100 and a midpoint of the second bridge arm 100; filtering the initial alternating voltages with different voltage grades through the filtering module to generate different voltages among a first output end N, a second output end R and a third output end S of the filtering moduleA target ac voltage of a grade. Wherein, a first modulation ratio corresponding to the first preset modulation wave and a second modulation ratio corresponding to the second preset modulation wave are both used for controlling the voltage V between the first output end N and the second output end R of the filtering module RN And for controlling the voltage V between the first output terminal N and the third output terminal S of the filter module SN Due to the voltage between the second output terminal R and the third output terminal S of the filter module, is defined by V RN And V SN The first modulation ratio corresponding to the first preset modulation wave, the second modulation ratio corresponding to the second preset modulation wave, and the phase difference between the first preset modulation wave and the second preset modulation wave are obtained by superposition, and the voltage V between the second output end R and the third output end S of the filter module is controlled by the first modulation ratio, the second modulation ratio corresponding to the second preset modulation wave and the phase difference between the first preset modulation wave and the second preset modulation wave together RS The voltage level of the single-phase inverter circuit can be controlled to output target alternating-current voltages with different voltage levels by adjusting the magnitude of the first modulation ratio, the magnitude of the second modulation ratio and the magnitude of the phase difference between the first preset modulation wave and the second preset modulation wave, and the overall size of the single-phase inverter circuit is smaller, so that the power density is higher.
In addition, the present application further provides a single-phase inverter, which includes the above-mentioned single-phase inverter circuit, and it can be understood that, since the above-mentioned single-phase inverter circuit is used in the single-phase inverter, the embodiment of the single-phase inverter includes all technical solutions of all embodiments of the above-mentioned single-phase inverter circuit, and the achieved technical effects are also completely the same, and are not repeated herein.
The above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application, and all modifications, equivalents, and direct/indirect applications in other related fields of technology that are within the scope of the present application are included in the present application.
Claims (10)
1. A single-phase inverter circuit, the single-phase inverter circuit comprising:
a direct current source;
the inverter bridge comprises a first bridge arm and a second bridge arm, the first bridge arm is respectively connected with the anode and the cathode of the direct current source, and the second bridge arm is respectively connected with the anode and the cathode of the direct current source;
the bus capacitor is respectively connected with the positive electrode and the negative electrode of the direct current source;
the first input end of the filtering module is connected with the midpoint of the bus capacitor, the second input end of the filtering module is connected with the midpoint of the first bridge arm, the third input end of the filtering module is connected with the midpoint of the second bridge arm, and the filtering module is used for filtering voltages among the midpoint of the bus capacitor, the midpoint of the first bridge arm and the midpoint of the first bridge arm so as to output target alternating-current voltages of different voltage levels.
2. The single-phase inverter circuit according to claim 1, wherein the bus capacitor includes a first capacitor and a second capacitor connected in series, the first capacitor is connected to a positive terminal of the dc source and the second capacitor, respectively, and an end of the second capacitor opposite to the first capacitor is connected to a negative terminal of the dc source.
3. The single-phase inverter circuit of claim 2, wherein a capacitance value of the first capacitor and a capacitance value of the second capacitor are equal.
4. The single-phase inverter circuit according to claim 1, further comprising a modulation module, wherein a first output terminal of the modulation module is connected to the first bridge arm, and is configured to input a first control signal generated according to a first preset modulation wave to the first bridge arm so as to control a switching operation of the switching element group in the first bridge arm; and a second output end of the modulation module is connected with the second bridge arm and is used for inputting a second control signal generated according to a second preset modulation wave to the second bridge arm so as to control the switching action of the switch element group in the second bridge arm.
5. The single-phase inverter circuit according to claim 4, wherein a phase of the first preset modulation wave is different from a phase of the second preset modulation wave.
6. The single-phase inverter circuit according to claim 5, wherein the target alternating-current voltages of different voltage levels include a first target alternating-current voltage, a second target alternating-current voltage, and a third target alternating-current voltage, a modulation ratio of the first preset modulation wave and a modulation ratio of the second preset modulation wave are used in common for controlling a voltage level of the first target alternating-current voltage and a voltage level of the second target alternating-current voltage, and a phase difference between the first preset modulation wave and the second preset modulation wave is used for controlling a voltage level of a third target alternating-current voltage obtained by superimposing the first target alternating-current voltage and the second target alternating-current voltage.
7. The single-phase inverter circuit of claim 1, wherein the filter module is any one of the following filter circuits: the circuit comprises an L filter circuit, an LC filter circuit and an LCL filter circuit.
8. The single-phase inverter circuit of claim 7, wherein the LC filter circuit comprises a first inductor, a second inductor, a third capacitor and a fourth capacitor, wherein one end of the first inductor is used as the first input end of the filter module, one end of the second inductor is used as the second input end of the filter module, one end of the third inductor is used as the third input end of the filter module, the third capacitor is connected with the other end of the first inductor and the other end of the second inductor, the fourth capacitor is connected with the other end of the second inductor and the other end of the third inductor, and target ac voltages with different voltage levels are formed among the other end of the first inductor, the other end of the second inductor and the other end of the third inductor.
9. A control method of a single-phase inverter circuit, the single-phase inverter circuit comprising an inverter bridge, a filter module and a DC source, the inverter bridge comprising a first bridge arm and a second bridge arm, the first bridge arm being connected to the positive pole and the negative pole of the DC source respectively, the second bridge arm being connected to the positive pole and the negative pole of the DC source respectively, the single-phase inverter circuit further comprising a bus capacitor, the bus capacitor being connected to the positive pole and the negative pole of the DC source respectively, a first input end of the filter module being connected to a midpoint of the bus capacitor, a second input end of the filter module being connected to a midpoint of the first bridge arm, and a third input end of the filter module being connected to a midpoint of the second bridge arm, the control method of the single-phase inverter circuit comprising:
acquiring a first control signal and a second control signal, wherein the first control signal is generated by a modulation module according to a first preset modulation wave, and the second control signal is generated by the modulation module according to a second preset modulation wave;
controlling the switching action of the switching element group of the first bridge arm according to the first control signal, and controlling the switching action of the switching element group of the second bridge arm according to the second control signal so as to generate initial alternating-current voltages with different voltage levels among the midpoint of the bus capacitor, the midpoint of the first bridge arm and the midpoint of the first bridge arm;
and filtering the initial alternating voltages with different voltage grades through the filtering module to obtain target alternating voltages with different voltage grades.
10. A single-phase inverter, characterized in that it comprises a single-phase inverter circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210659215.9A CN114944778A (en) | 2022-06-10 | 2022-06-10 | Single-phase inverter circuit and single-phase inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210659215.9A CN114944778A (en) | 2022-06-10 | 2022-06-10 | Single-phase inverter circuit and single-phase inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114944778A true CN114944778A (en) | 2022-08-26 |
Family
ID=82909661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210659215.9A Pending CN114944778A (en) | 2022-06-10 | 2022-06-10 | Single-phase inverter circuit and single-phase inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114944778A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115459620A (en) * | 2022-09-28 | 2022-12-09 | 杭州铂科电子有限公司 | Novel power converter |
-
2022
- 2022-06-10 CN CN202210659215.9A patent/CN114944778A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115459620A (en) * | 2022-09-28 | 2022-12-09 | 杭州铂科电子有限公司 | Novel power converter |
| CN115459620B (en) * | 2022-09-28 | 2024-05-07 | 杭州铂科电子有限公司 | Novel power converter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0253224B1 (en) | Circuit arrangement for operating low-pressure discharge lamps | |
| US8508957B2 (en) | Power conversion device for converting DC power to AC power | |
| US20110127837A1 (en) | Power conversion apparatus | |
| CN101873057A (en) | Active filter and power inverter | |
| WO2019215842A1 (en) | Power conversion device | |
| CN202424546U (en) | Extra high voltage DC high voltage generator having high stability | |
| JP2000295852A (en) | Power supply device | |
| CN114944778A (en) | Single-phase inverter circuit and single-phase inverter | |
| CN110165921B (en) | Switch inductor type quasi Z source inverter with high output voltage gain | |
| CN219068075U (en) | Main power circuit and alternating current coating power supply | |
| CN204538957U (en) | For filter apparatus and the DC-to-AC converter of the inverter of three-phase | |
| CN113422530B (en) | Control method for ensuring voltage balance of positive and negative direct current buses by energy storage inverter | |
| JPH0685622B2 (en) | Harmonic compensator | |
| CN112671257A (en) | Four-switch three-phase inverter based on Cuk converter and integral sliding mode controller | |
| JPWO2018046565A5 (en) | ||
| JP2016226224A (en) | Modular multilevel converter | |
| CN110768524A (en) | Power regulation method and device and charging equipment | |
| CN219087008U (en) | DC conversion topology and power supply device | |
| CN214412581U (en) | Circuit for reducing input current harmonic waves and bus voltage ripple waves of rectifying circuit | |
| KR102515599B1 (en) | Converter including Modular Plug-in Active Power Decoupling Circuit | |
| CN113691119B (en) | Three-phase power factor correcting device | |
| CN110581581A (en) | Charging device capable of reducing low-frequency leakage current | |
| EP3965276B1 (en) | Filter circuit with harmonic compensation | |
| CN220173111U (en) | Rectifier circuit based on synchronous diode | |
| CN212086071U (en) | Motor control circuit and air conditioning equipment |
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 |