Split-phase inverter circuit and split-phase inverter

Abstract

The utility model relates to the technical field of split-phase inverters, and discloses a split-phase inverter circuit and a split-phase inverter.The split-phase inverter circuit is connected with a preset direct-current power source through a circuit bridge arm, and a voltage-dividing bridge arm connected with the circuit bridge arm in parallel is formed through a first voltage-dividing capacitor and a second voltage-dividing capacitor, a middle point of the voltage division bridge arm is connected with a middle point of a first bridge arm in the circuit bridge arms through the voltage reduction inductor and then connected with the middle point of the voltage division bridge arm through the output module, a Buck circuit is formed through the first bridge arm, the voltage reduction inductor and the voltage division capacitor, and high voltage input into the split-phase inverter circuit through the direct-current power source is converted into stable low voltage. According to the split-phase inverter circuit, the negative influence of voltage fluctuation on the split-phase inverter circuit is avoided, meanwhile, a voltage equalizing circuit is formed through the first voltage dividing capacitor and the second voltage dividing capacitor, the voltage equalizing capacity of the split-phase inverter circuit on the direct current side is improved, the voltage of the split-phase inverter circuit on the direct current side is kept stable from two aspects, and the reliability of the split-phase inverter circuit is improved.

Description

Technical Field

[0001] The present application relates to the technical field of split-phase inverters, for example, to a split-phase inverter circuit and a split-phase inverter. Background Art

[0002] With the rapid development of power electronics technology, inverters, as key energy conversion devices, play an irreplaceable role in fields such as solar power generation, energy storage systems, electric vehicles, and industrial motor drives. The split-phase inverter circuit, due to its unique advantages, is particularly suitable for single-phase three-wire power grid environments, providing flexible access solutions for users with different power requirements. This circuit's unique design easily accommodates the low voltage and safety requirements of low-power loads. Furthermore, in high-power load scenarios, it enhances load capacity by increasing voltage levels, meeting users' diverse power needs.

[0003] However, while split-phase inverter circuits offer excellent compatibility with single-phase, three-wire power grids at the output end, they face significant challenges in voltage balancing on the DC side. As the inverter's operating time increases, voltage imbalance on the DC side gradually becomes apparent. This is primarily due to several factors: aging and damage to the DC power supply can lead to unstable output voltage; uneven distribution of the DC power supply within the system can exacerbate voltage differences; and problems such as poor cable connections, loose cables, or resistance imbalances can introduce additional voltage fluctuations. When these issues combine on the DC side of the split-phase inverter circuit, voltage imbalance can result. This not only reduces the inverter's overall operating efficiency but also negatively impacts power quality, such as increasing harmonic content and reducing voltage stability. It can even accelerate the aging of the inverter's internal components, increasing the risk of equipment damage and shortening the inverter's service life. Utility Model Content

[0004] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0005] The present application provides a split-phase inverter circuit and a split-phase inverter to improve the voltage balancing capability of the split-phase inverter circuit on the DC side.

[0006] The present application provides a split-phase inverter circuit, comprising: a bridge arm module, the input end of the bridge arm module is connected to a preset DC power supply, and the output end of the bridge arm module is connected to the input end of an output module, wherein the bridge arm module includes a plurality of circuit bridge arms connected in parallel, and the circuit bridge arms include at least a first bridge arm; a voltage-dividing bridge arm, which is connected in parallel with the first bridge arm, and the midpoint of the first bridge arm is connected to the output module via a step-down inductor and the midpoint of the voltage-dividing bridge arm in sequence, wherein the voltage-dividing bridge arm includes a first voltage-dividing capacitor and a second voltage-dividing capacitor, and the midpoint of the voltage-dividing bridge arm is located between the first voltage-dividing capacitor and the second voltage-dividing capacitor; an output module, the output end of the output module is connected to a preset circuit load, wherein the output module includes bridge arm output lines corresponding to each of the circuit bridge arms.

[0007] In one embodiment of the present application, the circuit bridge arm is composed of a first switch unit and a second switch unit, wherein the midpoint of the circuit bridge arm is located between the first switch unit and the second switch unit; the first end of the first switch unit is connected to the positive pole of the preset DC power supply; the first end of the second switch unit is connected to the second end of the first switch unit, and the second end of the second switch unit is connected to the negative pole of the preset DC power supply.

[0008] In one embodiment of the present application, both the first switch unit and the second switch unit are composed of a switch tube and a diode.

[0009] In one embodiment of the present application, the switch tube includes an IGBT transistor or a MOS tube.

[0010] In one embodiment of the present application, the circuit bridge arm further includes at least one of the following: a second bridge arm, a midpoint of the second bridge arm is connected to the output module; and a third bridge arm, a midpoint of the third bridge arm is connected to the output module.

[0011] In one embodiment of the present application, the bridge arm output line includes at least the following parts: a first output line, the input end of the first output line is connected to the midpoint of the voltage divider bridge arm; a second output line, the input end of the second output line is connected to the midpoint of the second bridge arm; and a third output line, the input end of the third output line is connected to the midpoint of the third bridge arm.

[0012] In one embodiment of the present application, the split-phase inverter circuit further includes a filter module, and the output end of the output module is connected to the circuit load through the filter module.

[0013] In one embodiment of the present application, the filtering module includes: a first filter inductor, which is arranged on the second output line, wherein the first end of the first filter inductor is connected to the midpoint of the second bridge arm; a first filter capacitor, wherein the first end of the first filter capacitor is connected to the second end of the first filter inductor, and the second end of the first filter capacitor is connected to the first output line; a second filter inductor, which is arranged on the third output line, wherein the first end of the second filter inductor is connected to the midpoint of the third bridge arm; a second filter capacitor, wherein the first end of the second filter capacitor is connected to the first output line, and the second end of the second filter capacitor is connected to the second end of the second filter inductor.

[0014] In one embodiment of the present application, the circuit load includes at least one of the following: a first load, wherein a first end of the first load is connected to the output end of the second output line, and a second end of the first load is connected to the output end of the first output line; a second load, wherein a first end of the second load is connected to the output end of the first output line, and a second end of the second load is connected to the output end of the third output line; and a third load, wherein a first end of the third load is connected to the first end of the second filter inductor, and a second end of the third load is connected to the output end of the third output line.

[0015] The present application provides a split-phase inverter, comprising the above-mentioned split-phase inverter circuit.

[0016] The present application provides a split-phase inverter circuit and a split-phase inverter, which can achieve the following technical effects:

[0017] A preset DC power supply is connected through a circuit bridge arm, and a voltage-dividing bridge arm in parallel with the circuit bridge arm is formed through a first voltage-dividing capacitor and a second voltage-dividing capacitor, wherein the middle point of the voltage-dividing bridge arm is connected to the middle point of the first bridge arm in the circuit bridge arm through a step-down inductor, and then the middle point of the voltage-dividing bridge arm is connected through an output module. In this way, a Buck circuit is formed by the first bridge arm, the step-down inductor and the voltage-dividing capacitor, and the high voltage input to the split-phase inverter circuit through the DC power supply is converted into a stable low voltage, avoiding the negative impact of voltage fluctuations on the split-phase inverter circuit. At the same time, a voltage-equalizing circuit is formed by the first voltage-dividing capacitor and the second voltage-dividing capacitor, which improves the voltage-equalizing capability of the split-phase inverter circuit on the DC side, maintains the voltage stability of the split-phase inverter circuit on the DC side from two aspects, and improves the reliability of the split-phase inverter circuit.

[0018] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation. In addition,

[0020] Figure 1 This is a schematic structural diagram of a split-phase inverter circuit provided by the present application;

[0021] Figure 2 is a structural diagram of another split-phase inverter circuit provided by the present application;

[0022] Figure 3 is a structural diagram of another split-phase inverter circuit provided by the present application;

[0023] Figure 4 is a schematic diagram of the output voltage of a split-phase inverter circuit provided by the present application;

[0024] Figure 5 This is a schematic diagram of the output voltage of another split-phase inverter circuit provided in this application.

[0025] Reference numerals:

[0026] 101: bridge arm module;

[0027] 1011: first bridge arm; G1: first switch unit of the first bridge arm; G2: second switch unit of the first bridge arm;

[0028] 1012: second bridge arm; G3: first switch unit of the second bridge arm; G4: second switch unit of the second bridge arm;

[0029] 1013: third bridge arm; G5: first switch unit of the third bridge arm; G6: second switch unit of the third bridge arm;

[0030] 102: voltage divider bridge arm; C1: first voltage divider capacitor; C2: second voltage divider capacitor; Ln: step-down inductor;

[0031] 103: output module; N: first output line; L1: second output line; L2: third output line;

[0032] 104: filter module; La: first filter inductor; Ca: first filter capacitor; Lb: second filter inductor; Cb: second filter capacitor;

[0033] 105: preset DC power supply;

[0034] 106: circuit load; R1: first load; R2: second load; R3: third load. DETAILED DESCRIPTION

[0035] In order to provide a more detailed understanding of the features and technical content of this application, the implementation of this application is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not intended to limit this application. In the following technical description, for the sake of convenience of explanation, multiple details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices may be simplified for display.

[0036] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate for the embodiments of the present application described herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0037] In this application, the terms "upper", "lower", "inner", "middle", "outer", "front", "back", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe this application and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0038] Furthermore, the terms "disposed," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a removable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or an internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0039] Unless otherwise stated, the term "plurality" means two or more.

[0040] In this application, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0041] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0042] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0043] Combine Figure 1 As shown, the present application provides a split-phase inverter circuit, including a bridge arm module 101 , a voltage-dividing bridge arm 102 and an output module 103 .

[0044] Optionally, the bridge arm module 101 is connected to a preset DC power supply 105 , and the output end of the bridge arm module is connected to the input end of the output module.

[0045] Optionally, the bridge arm module 101 includes a plurality of circuit bridge arms connected in parallel, and the circuit bridge arms include at least a first bridge arm.

[0046] Optionally, the voltage divider bridge arm 102 and the first bridge arm 1011 in the bridge arm module 101 are connected in parallel, and the midpoint of the voltage divider bridge arm 102 is connected to the midpoint of the first bridge arm 1011 through the step-down inductor Ln, and the midpoint of the first bridge arm 1011 is connected to the output module.

[0047] Optionally, the voltage-dividing bridge arm 102 is composed of a first voltage-dividing capacitor C1 and a second voltage-dividing capacitor C2 , and a middle point of the voltage-dividing bridge arm 102 is located between the first voltage-dividing capacitor C1 and the second voltage-dividing capacitor C2 .

[0048] Optionally, the output end of the output module 103 is connected to a preset circuit load.

[0049] Optionally, the output module 103 includes bridge arm output lines corresponding to each of the circuit bridge arms.

[0050] Combine Figure 2 As shown, an embodiment of the present disclosure provides a split-phase inverter circuit, including a bridge arm module 101 , a voltage-dividing bridge arm 102 , an output module 103 and a filter module 104 .

[0051] Optionally, the circuit bridge arm consists of a first switch unit and a second switch unit, wherein a midpoint of the circuit bridge arm is located between the first switch unit and the second switch unit.

[0052] Optionally, the first end of the first switch unit is connected to the positive electrode of the preset DC power supply.

[0053] Optionally, the first end of the second switch unit is connected to the second end of the first switch unit, and the second end of the second switch unit is connected to the negative electrode of the preset DC power supply;

[0054] Optionally, the switch unit is composed of semiconductor devices, for example, the switch unit is composed of a switch tube and a diode.

[0055] Optionally, the switch tube includes but is not limited to IGBT (Insulate-Gate Bipolar Transistor), MOSFET (Field Effect Transistor) and other switching devices.

[0056] Optionally, the diode includes a PN junction diode or the like.

[0057] In some embodiments, the operating principle of the switch unit is to utilize the forward conduction characteristics of the PN junction diode and the negative resistance characteristics of the switch tube to prevent reverse current. When a forward voltage is applied to the PN junction, the PN junction diode will conduct. At this time, the electrode voltage of the switch tube is zero, the switch tube is in the off state, and reverse current cannot pass. When a reverse voltage is applied to the PN junction, the PN junction diode will be cut off. At this time, the electrode voltage of the MOSFET is negative, the switch tube is in the on state, and the reverse current can flow back to the power supply through the channel of the switch tube, thereby achieving the function of freewheeling.

[0058] Optionally, the input end of the output module 103 is connected to the bridge arm module 101 and the voltage dividing bridge arm 102 respectively.

[0059] Optionally, the input end of the filter module 104 is connected to the output end of the output module 103 , and the output end of the filter module 104 is connected to the circuit load 106 , so that the output module 103 is connected to the circuit load 106 through the filter module 104 .

[0060] In some embodiments, the filter module 104 is an LC (Inductor-Capacitor) filter, which filters signals within a certain frequency band within a circuit by synergizing the characteristics of inductors and capacitors. In an LC filter, the inductor and capacitor serve as energy storage and energy storage, respectively. An inductor is made up of a coil, and when current flows through it, it generates a magnetic field and stores energy. A capacitor, on the other hand, is made up of two conductive plates and a dielectric. When voltage is applied, it stores charge between the two conductive plates. An LC filter typically consists of an inductor and a capacitor connected in series. When an input signal passes through the filter, it first enters the inductor. Due to the characteristics of the inductor, it has a lower impedance to low-frequency signals and a higher impedance to high-frequency signals. Therefore, the inductor blocks high-frequency signals, allowing only low-frequency signals to pass. After passing through the inductor, the signal enters the capacitor. The characteristics of the capacitor are that it has a higher impedance to low-frequency signals and a lower impedance to high-frequency signals. Therefore, the capacitor blocks low-frequency signals and allows only high-frequency signals to pass. Through the series connection of an inductor and capacitor, an LC filter can filter signals within a certain frequency range. Specifically, when the input signal is low-frequency, the inductor presents a smaller impedance, while the capacitor presents a larger impedance, allowing the low-frequency signal to pass through the filter. Conversely, when the input signal is high-frequency, the inductor presents a larger impedance, while the capacitor presents a smaller impedance, allowing the high-frequency signal to pass through the filter. The cutoff frequency of an LC filter is the frequency at which the filter's response to the input signal begins to decrease. This cutoff frequency is determined by the values of the inductor and capacitor and can be adjusted by adjusting their values. When the input signal's frequency is higher than the cutoff frequency, the filter's response to it gradually decreases, achieving a filtering effect.

[0061] Combine Figure 3 As shown, an embodiment of the present disclosure provides a split-phase inverter circuit.

[0062] Optionally, the circuit bridge arms include a first bridge arm 1011 , a second bridge arm 1012 and a third bridge arm 1013 .

[0063] Optionally, the first bridge arm 1011 includes a first switch unit G1 and a second switch unit G2, wherein the first end of the first switch unit G1 is connected to the positive pole of a preset DC power supply, the second end of the first switch unit G1 is connected to the first end of the second switch unit G2, and the second end of the second switch unit G2 is connected to the negative pole of the preset DC power supply, wherein the midpoint of the first bridge arm 1011 is located between the second end of the first switch unit G1 and the first end of the second switch unit G2.

[0064] Optionally, the second bridge arm 1012 includes a first switch unit G3 and a second switch unit G4, wherein the first end of the first switch unit G3 is connected to the positive pole of a preset DC power supply, the second end of the first switch unit G3 is connected to the first end of the second switch unit G4, and the second end of the second switch unit G4 is connected to the negative pole of the preset DC power supply, wherein the midpoint of the second bridge arm 1012 is located between the second end of the first switch unit G3 and the first end of the second switch unit G4.

[0065] Optionally, the third bridge arm 1013 includes a first switch unit G5 and a second switch unit G6, wherein the first end of the first switch unit G5 is connected to the positive pole of a preset DC power supply, the second end of the first switch unit G5 is connected to the first end of the second switch unit G6, and the second end of the second switch unit G6 is connected to the negative pole of the preset DC power supply, wherein the middle point of the second bridge arm 1013 is located between the second end of the first switch unit G5 and the first end of the second switch unit G6.

[0066] Optionally, in the voltage-dividing bridge arm 102, the first end of the first voltage-dividing capacitor C1 is connected to the positive electrode of a preset DC power supply, the second end of the first voltage-dividing capacitor C1 is connected to the first end of the second voltage-dividing capacitor C2, and the second end of the second voltage-dividing capacitor C2 is connected to the negative electrode of the preset DC power supply, wherein the midpoint of the voltage-dividing bridge arm 102 is located between the second end of the first voltage-dividing capacitor C1 and the first end of the second voltage-dividing capacitor C2.

[0067] Optionally, the first end of the step-down inductor Ln is respectively connected to the second end of the first switch unit G1 and the first end of the second switch unit G2, and the second end of the step-down inductor Ln is respectively connected to the second end of the first voltage-dividing capacitor C1 and the first end of the second voltage-dividing capacitor C2.

[0068] Optionally, the output module 103 includes a first output line N, a second output line L1 and a third output line L2.

[0069] Optionally, the first output line N is the bridge arm output line corresponding to the first bridge arm 1011, the input end of the first output line N is connected to the middle point of the voltage divider bridge arm 102, and the output end of the first output line N is respectively connected to the second end of the first load R1 and the first end of the second load R2.

[0070] Optionally, the second output line L1 is the bridge arm output line corresponding to the second bridge arm 1012, the input end of the second output line L1 is connected to the midpoint of the second bridge arm 1012, and the output end of the second output line L1 is respectively connected to the first end of the first load R1 and the first end of the third load R3.

[0071] Optionally, the third output line L2 is the bridge arm output line corresponding to the third bridge arm, the input end of the third output line L2 is connected to the midpoint of the third bridge arm 1013, and the output end of the third output line L2 is respectively connected to the second end of the second load R2 and the second end of the third load R3.

[0072] Optionally, the filtering module 104 includes a first filtering inductor La, a first filtering capacitor Ca, a second filtering inductor Lb, and a second filtering capacitor Cb.

[0073] Optionally, the first filter inductor La is provided on the second output line L1.

[0074] Optionally, a first end of the first filter capacitor Ca is connected to the second output line L1 , and a second end of the first filter capacitor Ca is connected to the first output line N.

[0075] Optionally, the second filtering inductor Lb is provided on the third output line L2.

[0076] Optionally, a first end of the second filter capacitor Cb is connected to the first output line N, and a second end of the second filter capacitor Cb is connected to the third output line L1.

[0077] Optionally, the circuit load 106 connected to the split-phase inverter circuit includes at least one of a first load R1 , a second load R2 and a third load R3 .

[0078] Optionally, the first load R1 is connected to the output end of the first output line N and the output end of the second output line L1 respectively.

[0079] Optionally, the second load R2 is connected to the output end of the first output line N and the output end of the third output line L2 respectively.

[0080] Optionally, the third load R3 is connected to the output end of the second output line L1 and the output end of the third output line L2 respectively.

[0081] The split-phase inverter circuit provided by the embodiment of the present disclosure is adopted, a preset DC power supply is connected through a circuit bridge arm, and a voltage-dividing bridge arm in parallel with the circuit bridge arm is formed through a first voltage-dividing capacitor and a second voltage-dividing capacitor, wherein the middle point of the voltage-dividing bridge arm is connected to the middle point of the first bridge arm in the circuit bridge arm through a step-down inductor, and then the middle point of the voltage-dividing bridge arm is connected through an output module. In this way, a Buck circuit is formed by the first bridge arm, the step-down inductor and the voltage-dividing capacitor, and the high voltage input to the split-phase inverter circuit through the DC power supply is converted into a stable low voltage, avoiding the negative impact of voltage fluctuations on the split-phase inverter circuit. At the same time, a voltage-equalizing circuit is formed by the first voltage-dividing capacitor and the second voltage-dividing capacitor, thereby improving the voltage-equalizing capability of the split-phase inverter circuit on the DC side, maintaining the voltage stability of the split-phase inverter circuit on the DC side from two aspects, and improving the reliability of the split-phase inverter circuit.

[0082] In some embodiments, an embodiment of the present disclosure provides a modulation method for a first bridge arm, including: obtaining a DC input voltage corresponding to a preset DC power supply, and obtaining a capacitor voltage corresponding to a reference capacitor, wherein the reference capacitor is a first voltage-dividing capacitor or a second voltage-dividing capacitor; performing calculations based on the DC input voltage and the capacitor voltage to obtain a voltage error value between the DC input voltage and the capacitor voltage; inputting the voltage error value between the DC input voltage and the capacitor voltage into a preset control module to generate a bridge arm drive signal corresponding to the first bridge arm to drive the first bridge arm, wherein the control module is composed of a voltage control loop and / or a current control loop.

[0083] In some embodiments, the second bridge arm and the third bridge arm are used as target bridge arms. An embodiment of the present disclosure provides a modulation method for the target bridge arm, including: determining a target bridge arm from the circuit bridge arm, wherein the target bridge arm is different from the first bridge arm, and the target bridge arm and the first bridge arm are connected to the same circuit load through a bridge arm output line; obtaining a voltage reference value and a voltage sampling value corresponding to the circuit load; performing calculations based on the voltage reference value and the voltage sampling value corresponding to the circuit load to obtain a voltage error value corresponding to the circuit load; inputting the voltage error value corresponding to the circuit load into a control module to generate a bridge arm drive signal corresponding to the target bridge arm to drive the target bridge arm.

[0084] In some embodiments, the control module generates a bridge arm drive signal in the following manner: in response to a voltage error value between the DC input voltage and the capacitor voltage, obtaining a current sampling value corresponding to the buck inductor, inputting the voltage error value between the DC input voltage and the capacitor voltage into a voltage control loop to obtain a voltage reference value corresponding to the buck inductor, performing calculations based on the current sampling value and the voltage reference value corresponding to the buck inductor to obtain a current error value corresponding to the buck inductor, and inputting the current control loop corresponding to the buck inductor to generate a bridge arm drive signal corresponding to the first bridge arm.

[0085] In some embodiments, the control module generates a bridge arm drive signal in the following manner: in response to a voltage error value corresponding to the circuit load, obtaining a current sampling value corresponding to the circuit load, inputting the voltage error value corresponding to the circuit load into a voltage control loop, obtaining a current reference value corresponding to the circuit load, obtaining a current reference value corresponding to the circuit load based on the current sampling value corresponding to the circuit load and the current reference value corresponding to the circuit load, and inputting the current error value into a current control loop to generate a bridge arm drive signal corresponding to the target bridge arm.

[0086] In some embodiments, the control module generates a bridge arm drive signal in the following manner: in response to a voltage error value between the DC input voltage and the capacitor voltage, the voltage error value between the DC input voltage and the capacitor voltage is input into a voltage control loop to generate a bridge arm drive signal corresponding to the first bridge arm.

[0087] In some embodiments, the control module generates the bridge arm drive signal in the following manner: in response to a voltage error value corresponding to the circuit load, the voltage error value corresponding to the circuit load is input into a voltage control loop to generate a bridge arm drive signal corresponding to the target bridge arm.

[0088] Combine Figure 4 As shown, each circuit bridge arm is driven respectively according to the bridge arm driving signal corresponding to each circuit bridge arm; under the action of the first bridge arm and the second bridge arm, an AC voltage waveform with an amplitude of 120V and a phase of 0° is formed on the first load; under the action of the first bridge arm and the third bridge arm, an AC voltage waveform with an amplitude of 120V and a phase of 180° is formed on the second load; under the action of the second bridge arm and the third bridge arm, an AC voltage waveform with an amplitude of 240V is formed on the third load.

[0089] Combine Figure 5 As shown, each circuit bridge arm is driven separately according to the bridge arm driving signal corresponding to each circuit bridge arm; under the action of the first bridge arm and the second bridge arm, an AC voltage waveform with an amplitude of 120V and a phase of 0° is formed on the first load; under the action of the first bridge arm and the third bridge arm, an AC voltage waveform with an amplitude of 120V and a phase of 0° is formed on the second load; under the action of the second bridge arm and the third bridge arm, an AC voltage waveform with an amplitude of 240V is formed on the third load.

[0090] An embodiment of the present disclosure further provides a split-phase inverter, comprising a split-phase inverter circuit as described above.

[0091] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless expressly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A split-phase inverter circuit, characterized in that: include: A bridge arm module, wherein an input end of the bridge arm module is connected to a preset DC power supply, and an output end of the bridge arm module is connected to an input end of the output module, wherein the bridge arm module includes a plurality of circuit bridge arms connected in parallel, and the circuit bridge arms include at least a first bridge arm; A voltage-dividing bridge arm is connected in parallel with the first bridge arm, and a midpoint of the first bridge arm is connected to the output module in sequence through a step-down inductor and the midpoint of the voltage-dividing bridge arm, wherein the voltage-dividing bridge arm includes a first voltage-dividing capacitor and a second voltage-dividing capacitor, and the midpoint of the voltage-dividing bridge arm is located between the first voltage-dividing capacitor and the second voltage-dividing capacitor; An output module, wherein an output end of the output module is connected to a preset circuit load, wherein the output module includes bridge arm output lines corresponding to each of the circuit bridge arms.

2. The split-phase inverter circuit according to claim 1, wherein: The circuit bridge arm is composed of a first switch unit and a second switch unit, wherein the middle point of the circuit bridge arm is located between the first switch unit and the second switch unit; The first end of the first switch unit is connected to the positive electrode of the preset DC power supply; The first end of the second switch unit is connected to the second end of the first switch unit, and the second end of the second switch unit is connected to the negative electrode of the preset DC power supply.

3. The split-phase inverter circuit according to claim 2, wherein: The first switch unit and the second switch unit are both composed of a switch tube and a diode.

4. The split-phase inverter circuit according to claim 3, characterized in that: The switch tube includes an IGBT transistor or a MOS tube.

5. The split-phase inverter circuit according to claim 2, characterized in that: The circuit bridge arm further includes at least one of the following: a second bridge arm, wherein a midpoint of the second bridge arm is connected to the output module; A third bridge arm, wherein a midpoint of the third bridge arm is connected to the output module.

6. The split-phase inverter circuit according to claim 5, characterized in that: The bridge arm output line includes at least one of the following: a first output line, wherein an input end of the first output line is connected to a middle point of the voltage dividing bridge arm; a second output line, wherein an input end of the second output line is connected to a middle point of the second bridge arm; A third output line, wherein an input end of the third output line is connected to a middle point of the third bridge arm.

7. The split-phase inverter circuit according to claim 6, characterized in that: The split-phase inverter circuit further includes a filter module, and the output end of the output module is connected to the circuit load through the filter module.

8. The split-phase inverter circuit according to claim 7, characterized in that: The filtering module includes: a first filter inductor, provided on the second output line, wherein a first end of the first filter inductor is connected to a midpoint of the second bridge arm; a first filter capacitor, wherein a first end of the first filter capacitor is connected to a second end of the first filter inductor, and a second end of the first filter capacitor is connected to the first output line; a second filter inductor, provided on the third output line, wherein a first end of the second filter inductor is connected to a midpoint of the third bridge arm; A second filter capacitor, wherein a first end of the second filter capacitor is connected to the first output line, and a second end of the second filter capacitor is connected to the second end of the second filter inductor.

9. The split-phase inverter circuit according to claim 8, characterized in that: The circuit load includes at least one of the following: a first load, wherein a first end of the first load is connected to the output end of the second output line, and a second end of the first load is connected to the output end of the first output line; a second load, wherein a first end of the second load is connected to the output end of the first output line, and a second end of the second load is connected to the output end of the third output line; A third load, wherein a first end of the third load is connected to the first end of the second filter inductor, and a second end of the third load is connected to the output end of the third output line.

10. A split-phase inverter, characterized in that: Comprising the split-phase inverter circuit as described in any one of claims 1 to 9.

Images