Single-stage boost type inverter circuit and control module thereof
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GPOWER SEMICON
- Filing Date
- 2021-02-08
- Publication Date
- 2026-06-02
Smart Images
Figure CN114915197B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of power electronics technology, and in particular to a single-stage boost inverter circuit and its control module. Background Technology
[0002] In new energy power generation technologies, two-stage or multi-stage power conversion devices are typically required to convert low-voltage direct current (DC) to high-voltage alternating current (AC). However, to reduce costs and system complexity, researchers have proposed various single-stage boost inverter circuits. Compared to the former, single-stage boost inverter circuits can significantly reduce system size and the number of components, and simplify system control.
[0003] However, a problem with single-stage boost inverter circuits is that they require hard-switching of power devices. Hard-switching makes electromagnetic interference (EMI) and switching losses particularly prominent. Furthermore, to prevent reverse current flow between the input and output sides, an anti-reverse current module composed of diodes is often added to the inverter circuit. Because diodes have large forward voltage drops, this increases conduction losses, further reducing the efficiency of the power conversion device.
[0004] Therefore, existing single-stage boost inverter circuits suffer from electromagnetic interference and high losses. Summary of the Invention
[0005] This invention provides a single-stage boost inverter circuit and its control module to reduce electromagnetic interference and circuit losses.
[0006] In a first aspect, embodiments of the present invention provide a single-stage boost inverter circuit, comprising: an input DC power supply, a bus capacitor module, an energy storage soft-switching module, a synchronous rectification module, an inverter bridge module, and an output filter module; wherein the input DC power supply and the bus capacitor module constitute a high-voltage DC power supply;
[0007] The energy storage soft-switching module includes a switch input terminal and a switch output terminal, wherein the switch input terminal is connected to an input DC power supply;
[0008] The synchronous rectification module includes a rectification input terminal, a first rectification output terminal, and a second rectification output terminal, wherein the rectification input terminal is electrically connected to the switch output terminal;
[0009] The inverter bridge module includes a first power supply terminal, a second power supply terminal, a first output terminal, and a second output terminal. The first power supply terminal and the second power supply terminal are connected to the two ends of the high voltage DC power supply. The first output terminal is electrically connected to the first rectifier output terminal, and the second output terminal is electrically connected to the second rectifier output terminal.
[0010] The output filtering module includes a first filtering input terminal, a second filtering input terminal, a first filtering output terminal, and a second filtering output terminal. The first filtering input terminal is electrically connected to the first output terminal of the inverter bridge module, and the second filtering input terminal is electrically connected to the second output terminal of the inverter bridge module. A load is connected between the first filtering output terminal and the second filtering output terminal.
[0011] Optionally, the bus capacitor module is connected in series between the positive terminal of the input DC power supply and the first power supply terminal of the inverter bridge module, and the second power supply terminal of the inverter bridge module is electrically connected to the negative terminal of the input DC power supply.
[0012] Alternatively, the bus capacitor module is connected in parallel between the first power supply terminal and the second power supply terminal of the inverter bridge module, and the second power supply terminal of the inverter bridge module is electrically connected to the negative terminal of the input DC power supply.
[0013] Optionally, the single-stage boost inverter circuit also includes:
[0014] An input capacitor module is connected in parallel across the two ends of the input DC power supply.
[0015] Optionally, the energy storage soft-switching module includes:
[0016] A first energy storage inductor, the first terminal of which is connected to the input DC power supply;
[0017] A first soft-switching auxiliary switch, the first end of which is electrically connected to the second end of the first energy storage inductor, and the second end of which is electrically connected to the rectifier input terminal of the synchronous rectifier module;
[0018] The second energy storage inductor has its first terminal electrically connected to the rectifier output terminal of the synchronous rectifier module.
[0019] A second soft-switching auxiliary switch is provided, with its second terminal electrically connected to the second terminal of the second energy storage inductor, and its first terminal connected to the input DC power supply.
[0020] The first diode, wherein the anode of the first diode is electrically connected to the second terminal of the first energy storage inductor;
[0021] A first resonant inductor, wherein a first end of the first resonant inductor is electrically connected to the cathode of the first diode, and a second end of the first resonant inductor is electrically connected to the second end of the second energy storage inductor.
[0022] Optionally, the synchronous rectification module includes:
[0023] A first synchronous rectifier switch, the first end of which is electrically connected to the energy storage soft switch module, and the second end of which is electrically connected to the first output end of the inverter bridge module;
[0024] The second synchronous rectifier switch has its first terminal electrically connected to the energy storage soft switch module and its second terminal electrically connected to the second output terminal of the inverter bridge module.
[0025] Optionally, the inverter bridge module includes:
[0026] The inverter bridge first switch has its first terminal connected to the positive terminal of the high voltage DC power supply, and its second terminal serves as the first output terminal of the inverter bridge module.
[0027] The second switch of the inverter bridge has its first terminal electrically connected to the second terminal of the first switch of the inverter bridge, and its second terminal is connected to the negative terminal of the high voltage DC power supply.
[0028] The third switch of the inverter bridge has its first terminal connected to the positive terminal of the high voltage DC power supply, and its second terminal serving as the second output terminal of the inverter bridge module.
[0029] The fourth switch of the inverter bridge has its first terminal electrically connected to the second terminal of the third switch of the inverter bridge, and the second terminal of the fourth switch of the inverter bridge is connected to the negative terminal of the high-voltage DC power supply.
[0030] Optionally, the output filtering module includes an L-type, LC-type, or LCL-type filter.
[0031] Optionally, the switches in the inverter bridge module are all group III nitride transistors.
[0032] Optionally, at least one of the energy storage soft-switching module, the synchronous rectification module, and the inverter bridge module adopts an integrated packaging structure.
[0033] Secondly, embodiments of the present invention also provide a control module for a single-stage boost inverter circuit, used to control the single-stage boost inverter circuit provided in any embodiment of the present invention. The control module includes: a modulation comparator unit, a first combinational logic unit, a second combinational logic unit, and a third combinational logic unit.
[0034] The modulation comparison unit includes a first input terminal, a second input terminal, a third input terminal, a first output terminal, a second output terminal, and a third output terminal. The first input terminal of the modulation comparison unit receives a first modulated wave input signal, the second input terminal receives a first carrier input signal, and the third input terminal receives a second modulated wave input signal. The modulation comparison unit processes the first carrier input signal, the first modulated wave input signal, and the second modulated wave input signal to generate a sinusoidal pulse width modulation signal, a fixed pulse width modulation signal, and a sinusoidal polarity determination signal, which are output by the first output terminal, the second output terminal, and the third output terminal of the modulation comparison unit, respectively.
[0035] The first combinational logic unit includes an input terminal and an output terminal. The input terminal of the first combinational logic unit receives the sinusoidal polarity determination signal. The first combinational logic unit is used to generate a switching control signal for the synchronous rectification module from the sinusoidal polarity determination signal, and the signal is output from the output terminal of the first combinational logic unit.
[0036] The second combinational logic unit includes a first input terminal, a second input terminal, a third input terminal, and an output terminal. The first input terminal of the second combinational logic unit receives the fixed pulse width modulation signal, the second input terminal receives the sinusoidal polarity determination signal, and the third input terminal receives the sinusoidal pulse width modulation signal. The second combinational logic unit processes the sinusoidal polarity determination signal, the sinusoidal pulse width modulation signal, and the fixed pulse width modulation signal to generate the switching control signal of the inverter bridge module, which is then output by the output terminal of the second combinational logic unit.
[0037] The third combinational logic unit includes a first input terminal, a second input terminal, and an output terminal. The first input terminal receives the sinusoidal polarity determination signal, and the second input terminal receives the switching control signal of the inverter bridge module. The third combinational logic unit processes the sinusoidal polarity determination signal and the switching control signal of the inverter bridge module to generate the switching control signal of the energy storage soft-switching module, which is then output by the output terminal of the third combinational logic unit.
[0038] Optionally, the modulation comparison unit includes:
[0039] An adder, wherein the first input terminal of the adder receives the first carrier input signal, and the second input terminal of the adder receives the first modulated wave input signal;
[0040] A first comparator, the first input of which is connected to the output of the adder, and the second input of which is a reference ground signal of the control module.
[0041] The first inverter is connected to the output of the first comparator.
[0042] The second comparator receives the first modulated wave input signal at its first input terminal and the first carrier input signal at its second input terminal.
[0043] A first OR gate, the first input of which is connected to the output of the first inverter, and the second input of which is connected to the output of the second comparator; the output of the first OR gate outputs the sinusoidal pulse width modulation signal.
[0044] A third comparator is configured such that the second modulated wave input signal is input to its first input terminal, the first carrier input signal is input to its second input terminal, and the fixed pulse width modulated signal is output to its output terminal.
[0045] The fourth comparator receives the first modulated wave input signal at its first input terminal, the control module reference ground signal at its second input terminal, and the sinusoidal polarity determination signal at its output terminal.
[0046] Optionally, the switching control signal of the synchronous rectification module includes a first switching control signal and a second switching control signal;
[0047] The first combinational logic unit includes:
[0048] The second inverter receives the sinusoidal polarity determination signal at its input terminal and outputs the second switch control signal at its output terminal; the sinusoidal polarity determination signal serves as the first switch control signal.
[0049] Optionally, the switching control signals of the inverter bridge module include a third switching control signal, a fourth switching control signal, a fifth switching control signal, and a sixth switching control signal;
[0050] The second combinational logic unit includes:
[0051] The first NAND gate has a sine polarity determination signal input to its first input terminal and a sine pulse width modulation signal input to its second input terminal; the logic polarities of the first input terminal and its second input terminal are opposite.
[0052] The second NAND gate has the sinusoidal pulse width modulation signal input at its first input terminal and the sinusoidal polarity determination signal input at its second input terminal.
[0053] The third NAND gate has the fixed pulse width modulation signal input at its first input terminal, the second input terminal of the third NAND gate connected to the output terminal of the first NAND gate, and the third switch control signal output at its output terminal.
[0054] The first AND gate has its first input connected to the output of the first NAND gate, the second input of the first AND gate receives the fixed pulse width modulation signal, and the output of the first AND gate outputs the fourth switch control signal.
[0055] The fourth NAND gate has the fixed pulse width modulation signal input at its first input terminal, the second input terminal of the fourth NAND gate connected to the output terminal of the second NAND gate, and the fifth switch control signal output at its output terminal.
[0056] The second AND gate has its first input connected to the output of the second NAND gate. The second input of the second AND gate receives the fixed pulse width modulation signal, and the output of the second AND gate outputs the sixth switch control signal.
[0057] Optionally, the switching control signals of the energy storage soft-switching module include a seventh switching control signal and an eighth switching control signal;
[0058] The third combinational logic unit includes:
[0059] The first delay unit receives a third switch control signal at its input terminal.
[0060] The second OR gate has its first input terminal connected to the output terminal of the first delay unit, and its second input terminal receives a fourth switch control signal.
[0061] The third AND gate has its first input terminal connected to the output terminal of the second OR gate, and the second input terminal of the third AND gate receives the sinusoidal polarity determination signal.
[0062] The third inverter is input to the sinusoidal polarity determination signal.
[0063] The second delay unit receives the fifth switch control signal at its input terminal.
[0064] The third OR gate has its first input connected to the output of the second delay unit, and its second input receives the sixth switch control signal.
[0065] The fourth AND gate has its first input connected to the output of the third inverter, and its second input connected to the output of the third OR gate.
[0066] The fourth OR gate has its first input connected to the output of the third AND gate, its second input connected to the output of the fourth AND gate, its first output outputting the seventh switch control signal, and its second output outputting the eighth switch control signal.
[0067] The embodiments of the present invention can achieve at least the following beneficial effects:
[0068] Firstly, while performing single-stage boost inverter, the energy storage soft-switching module is used to turn on all switches in the inverter bridge module at zero voltage. Compared with the hard-switching operation in the prior art, this greatly reduces system electromagnetic interference, improves system stability and reliability, and reduces circuit switching losses, thereby improving circuit power conversion efficiency.
[0069] Secondly, the synchronous rectification module can prevent input-output current backflow, enabling the switches in the inverter bridge module to switch alternately with low power consumption. Compared with the diode anti-reverse current module used in the prior art, it reduces conduction loss and further improves the power conversion efficiency of the circuit.
[0070] Thirdly, compared with the existing two-stage structure that requires simultaneous implementation of boost-inverting and soft-switching control of the front and rear stages, the circuit structure of the present invention is simple. Correspondingly, the single-stage boost inverter circuit only needs to implement the control of one stage of power conversion. The control method and control structure are simple and easy to implement. Attached Figure Description
[0071] Figure 1 This is a schematic diagram of a single-stage boost inverter circuit provided in an embodiment of the present invention;
[0072] Figure 2 A schematic diagram of another single-stage boost inverter circuit provided in an embodiment of the present invention;
[0073] Figure 3 A waveform diagram of a key node in a single-stage boost inverter circuit provided in an embodiment of the present invention;
[0074] Figure 4 An equivalent circuit diagram of mode 1 of a single-stage boost inverter circuit provided in an embodiment of the present invention;
[0075] Figure 5 An equivalent circuit diagram of mode 2 of a single-stage boost inverter circuit provided in an embodiment of the present invention;
[0076] Figure 6 An equivalent circuit diagram of mode 3 of a single-stage boost inverter circuit provided in an embodiment of the present invention;
[0077] Figure 7 An equivalent circuit diagram of mode 4 of a single-stage boost inverter circuit provided in an embodiment of the present invention;
[0078] Figure 8 An equivalent circuit diagram of mode 5 of a single-stage boost inverter circuit provided in an embodiment of the present invention;
[0079] Figure 9 An equivalent circuit diagram of mode 6 of a single-stage boost inverter circuit provided in an embodiment of the present invention;
[0080] Figure 10 An equivalent circuit diagram of mode 7 of a single-stage boost inverter circuit provided in an embodiment of the present invention;
[0081] Figure 11 An equivalent circuit diagram of mode 8 of a single-stage boost inverter circuit provided in an embodiment of the present invention;
[0082] Figure 12 A waveform diagram of DC input voltage and AC output voltage provided for an embodiment of the present invention;
[0083] Figure 13 The switching waveform diagram of the inverter bridge module of a single-stage boost inverter circuit provided in this embodiment of the invention;
[0084] Figure 14 A switching waveform diagram of an energy storage soft-switching module for a single-stage boost inverter circuit provided in an embodiment of the present invention;
[0085] Figure 15 A schematic diagram of yet another single-stage boost inverter circuit provided in an embodiment of the present invention;
[0086] Figure 16 This is a schematic diagram of the structure of a synchronous rectification module provided in an embodiment of the present invention;
[0087] Figure 17 A schematic diagram of the structure of a control module for a single-stage boost inverter circuit provided in an embodiment of the present invention;
[0088] Figure 18 This is a schematic diagram of the structure of a modulation comparator unit provided in an embodiment of the present invention;
[0089] Figure 19 This is a schematic diagram of the structure of a first combinational logic unit provided in an embodiment of the present invention;
[0090] Figure 20This is a schematic diagram of the structure of a second combinational logic unit provided in an embodiment of the present invention;
[0091] Figure 21 This is a schematic diagram of the structure of a third combinational logic unit provided in an embodiment of the present invention. Detailed Implementation
[0092] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.
[0093] Figure 1 This is a schematic diagram of a single-stage boost inverter circuit provided in an embodiment of the present invention. See also... Figure 1 The single-stage boost inverter circuit includes: an input DC power supply Uin, a bus capacitor module 60, an energy storage soft-switching module 10, a synchronous rectification module 20, an inverter bridge module 30, and an output filter module 40. The input DC power supply Uin and the bus capacitor module 60 constitute a high-voltage DC power supply, used to provide high-voltage DC power to the inverter bridge module 30. There are various connection relationships between the input DC power supply Uin and the bus capacitor module 60. For example, the bus capacitor module 60 is connected in series between the positive terminal of the input DC power supply Uin and the first power supply terminal 31 of the inverter bridge module 30, and the second power supply terminal 32 of the inverter bridge module 30 is electrically connected to the negative terminal of the input DC power supply Uin. In this case, the high-voltage DC power supply refers to the structure after the input DC power supply Uin and the bus capacitor module 60 are connected in series. The energy storage soft-switching module 10 includes a switch input terminal 11 and a switch output terminal 12, with the switch input terminal 11 connected to the input DC power supply Uin. The synchronous rectification module 20 includes a rectifier input terminal 21, a first rectifier output terminal 22, and a second rectifier output terminal 23. The rectifier input terminal 21 is electrically connected to the switch output terminal 12. The inverter bridge module 30 includes a first power supply terminal 31 (positive V+), a second power supply terminal 32 (negative V-), a first output terminal 33, and a second output terminal 34. The first power supply terminal 31 and the second power supply terminal 32 are connected to the two ends of a high-voltage DC power supply. The first output terminal 33 is electrically connected to the first rectifier output terminal 22, and the second output terminal 34 is electrically connected to the second rectifier output terminal 23. The output filter module 40 includes a first filter input terminal 41, a second filter input terminal 42, a first filter output terminal 43, and a second filter output terminal 44. The first filter input terminal 41 is electrically connected to the first output terminal 33 of the inverter bridge module 30, and the second filter input terminal 42 is electrically connected to the second output terminal 34 of the inverter bridge module 30. A load RL is connected between the first filter output terminal 43 and the second filter output terminal 44.
[0094] The input DC power supply Uin includes a positive terminal and a negative terminal, with the negative terminal connected to the first ground GND1. The second filter output terminal 44 of the output filter module 40 is connected to the second ground GND2. The inverter bridge module 30 can convert high-voltage DC power into a preset boosted AC power through a single-stage boost converter. Furthermore, the embodiments of the present invention can achieve at least the following beneficial effects:
[0095] Firstly, while performing single-stage boost inverter, the energy storage soft-switching module 10 is used to turn on all switches in the inverter bridge module 30 at zero voltage. Compared with the hard-switching operation in the prior art, this greatly reduces system electromagnetic interference, improves system stability and reliability, and reduces circuit switching losses, thereby improving circuit power conversion efficiency.
[0096] Secondly, the synchronous rectification module 20 can prevent input-output current backflow, enabling the switches in the inverter bridge module 30 to switch alternately with low power consumption. Compared with the diode anti-reverse current module used in the prior art, it reduces conduction loss and further improves the circuit power conversion efficiency.
[0097] Thirdly, compared with the existing two-stage structure that requires simultaneous implementation of boost-inverting and soft-switching control of the front and rear stages, the circuit structure of the present invention is simple. Correspondingly, the single-stage boost inverter circuit only needs to implement the control of one stage of power conversion. The control method and control structure are simple and easy to implement.
[0098] The specific circuit structure and working principle of the single-stage boost inverter circuit provided in the embodiments of the present invention will be described by way of example below. Figure 2 This is a schematic diagram of another single-stage boost inverter circuit provided in an embodiment of the present invention. See also... Figure 2 Based on the above embodiments, optionally, the single-stage boost inverter circuit further includes an input capacitor module 50. Exemplarily, the input capacitor module 50 includes an input capacitor Cin, and the bus capacitor module 60 includes a bus capacitor Cdc.
[0099] See also Figure 2Optionally, the energy storage soft-switching module 10 includes: a first energy storage inductor Lin1, a first soft-switching auxiliary switch Saux1, a second energy storage inductor Lin2, a second soft-switching auxiliary switch Saux2, a first diode Din, and a first resonant inductor Lr. The first terminal of the first energy storage inductor Lin1 is connected to the input DC power supply Uin; the first terminal of the first soft-switching auxiliary switch Saux1 is electrically connected to the second terminal of the first energy storage inductor Lin1, and the second terminal of the first soft-switching auxiliary switch Saux1 is electrically connected to the synchronous rectification module 20; the first terminal of the second energy storage inductor Lin2 is electrically connected to the synchronous rectification module 20; the second terminal of the second soft-switching auxiliary switch Saux2 is electrically connected to the second terminal of the second energy storage inductor Lin2, and the first terminal of the second soft-switching auxiliary switch Saux2 is connected to the input DC power supply Uin; the anode of the first diode Din is electrically connected to the second terminal of the first energy storage inductor Lin1; the first terminal of the first resonant inductor Lr is electrically connected to the cathode of the first diode Din, and the second terminal of the first resonant inductor Lr is electrically connected to the second terminal of the second energy storage inductor Lin2.
[0100] See also Figure 2 Optionally, the synchronous rectification module 20 includes: a first synchronous rectification switch Sd1 and a second synchronous rectification switch Sd2. The first terminal of the first synchronous rectification switch Sd1 is electrically connected to the energy storage soft-switching module 10, and the second terminal of the first synchronous rectification switch Sd1 is electrically connected to the first output terminal 33 (node A) of the inverter bridge module 30. The first terminal of the second synchronous rectification switch Sd2 is electrically connected to the energy storage soft-switching module 10, and the second terminal of the second synchronous rectification switch Sd2 is electrically connected to the second output terminal 34 (node B) of the inverter bridge module 30.
[0101] See also Figure 2 Optionally, the inverter bridge module 30 includes: a first inverter bridge switch S1, a second inverter bridge switch S2, a third inverter bridge switch S3, and a fourth inverter bridge switch S4. The first terminal of the first inverter bridge switch S1 is electrically connected to the bus capacitor Cdc, and the second terminal of the first inverter bridge switch S1 serves as the first output terminal 33 (node A) of the inverter bridge module 30. The first terminal of the second inverter bridge switch S2 is electrically connected to the second terminal (node A) of the first inverter bridge switch S1, and the second terminal of the second inverter bridge switch S2 is connected to the first ground GND1. The first terminal of the third inverter bridge switch S3 is electrically connected to the bus capacitor Cdc, and the second terminal of the third inverter bridge switch S3 serves as the second output terminal (node B) of the inverter bridge module 30. The first terminal of the fourth inverter bridge switch S4 is electrically connected to the second terminal (node B) of the third inverter bridge switch S3, and the second terminal of the fourth inverter bridge switch S4 is connected to the first ground GND1.
[0102] See also Figure 2 Optionally, the output filter module 40 includes an L-type, LC-type, or LCL-type filter. Figure 2 The example shows an output filter module 40 as an LC type. Specifically, the output filter module 40 includes a filter inductor Lo and a filter capacitor Co. The filter inductor Lo is connected between node A and the load RL, and the filter capacitor Co is connected in parallel with the load RL.
[0103] Each module's switch is controlled by its gate-source voltage. For example, the switch is a P-channel type. When the gate-source voltage difference of the switch is low, the switch is turned on; when the gate-source voltage difference of the switch is high, the switch is turned off. Figure 3 This is a waveform diagram of a key node in a single-stage boost inverter circuit provided as an embodiment of the present invention. See also... Figure 3 For example, the output waveform of a single-stage boost inverter circuit is a sine wave, and the operating states within the positive and negative half-cycles of the sine wave are symmetrical. Figure 3 The waveforms are the main switching waveforms within one switching cycle of the negative half-cycle. Waveform L1 represents the gate-source voltages of the first and second soft-switching auxiliary switches of the energy storage soft-switching module, with the gate-source voltages of the first and second soft-switching auxiliary switches (seventh switch control signal) Vgsaux1 and Vgsaux2 being the same; waveform L2 represents the gate-source voltage of the first switch of the inverter bridge module (third switch control signal) Vgs1; waveform L3 represents the gate-source voltage of the second switch of the inverter bridge module (fourth switch control signal) Vgs2; waveform L4 represents the gate-source voltage of the third switch of the inverter bridge module (fifth switch control signal) Vgs3; waveform L5 represents the gate-source voltage of the fourth switch of the inverter bridge module (sixth switch control signal) Vgs4; waveform L6 represents the current i of the first resonant inductor of the energy storage soft-switching module. Lr Waveform L7 represents the current i of the first energy storage inductor Lin1 in the energy storage soft-switching module. Lin1 .
[0104] It can be seen that within one switching cycle, the single-stage boost soft-switching inverter circuit mainly has 8 different operating stages: Mode 1, i.e., the time period [t0-t1]; Mode 2, i.e., the time period [t1-t2]; Mode 3, i.e., the time period [t2-t3]; Mode 4, i.e., the time period [t3-t4]; Mode 5, i.e., the time period [t4-t5]; Mode 6, i.e., the time period [t5-t6]; Mode 7, i.e., the time period [t6-t7]; and Mode 8, i.e., the time period [t7-t8].
[0105] Figure 4 This is an equivalent circuit diagram of mode 1 of a single-stage boost inverter circuit provided in an embodiment of the present invention. (Combined with...) Figure 3 and Figure 4In mode 1, the second switch S2 and the fourth switch S4 of the inverter bridge are turned on, the second synchronous rectifier switch Sd2 is turned on, and the first soft-switching auxiliary switch Saux1 and the second soft-switching auxiliary switch Saux2 are turned on. The first energy storage inductor Lin1 and the second energy storage inductor Lin2 are connected in parallel for charging and energy storage. The currents of the first energy storage inductor Lin1 and the second energy storage inductor Lin2 flow through the first soft-switching auxiliary switch Saux1 and the second soft-switching auxiliary switch Saux2, respectively. The first diode is reverse biased, and the current of the first resonant inductor is zero. The body diode of the first synchronous rectifier switch Sd1 of the synchronous rectifier module will be naturally turned on by voltage clamping.
[0106] Figure 5 This is an equivalent circuit diagram of mode 2 of a single-stage boost inverter circuit provided in an embodiment of the present invention. (Combined with...) Figure 3 and Figure 5 In mode 2, the first switch S1 of the inverter bridge or its body diode is turned on, the third switch S3 of the inverter bridge or its body diode is turned on, the body diode of the first synchronous rectifier switch Sd1 is turned on, the second synchronous rectifier switch Sd2 is turned on, and the body diodes of the first soft-switching auxiliary switch Saux1 and the second soft-switching auxiliary switch Saux2 are turned on. At the beginning of this stage, the current i in the first resonant inductor Lr... Lr Starting from zero, the first diode Din turns on with zero current, while the first soft-switching auxiliary switches Saux1 and Saux2 turn off with zero voltage. Current flowing through the first energy storage inductors Lin1 and Lin2 charges the junction capacitance of the second and fourth switches of the inverter bridge, and discharges the junction capacitance of the first and third switches S3. When the first and third switches S1 and S3 turn on with zero voltage, the first and second energy storage inductors Lin1 and Lin2 discharge, and the current gradually decreases. The current in the first resonant inductor Lr increases until the currents of the first and second energy storage inductors Lin1 and Lin2 equal the current of the first resonant inductor Lr, at which point this stage ends.
[0107] Figure 6 This is an equivalent circuit diagram of mode 3 of a single-stage boost inverter circuit provided in an embodiment of the present invention. (Combined with...) Figure 3 and Figure 6 In mode 3, the body diodes of the first switch S1, the third switch S3, the first synchronous rectifier switch Sd1, and the second synchronous rectifier switch Sd2 of the inverter bridge are turned on. At the beginning of this stage, the body diodes of the first soft-switching auxiliary switch Saux1 and the second soft-switching auxiliary switch Saux2 are turned off with zero current. Throughout this stage, the currents of the first energy storage inductor Lin1 and the second energy storage inductor Lin2 are equal to the current i of the first resonant inductor Lr. Lr equal.
[0108] Figure 7 This is an equivalent circuit diagram of mode 4 of a single-stage boost inverter circuit provided in an embodiment of the present invention. (Combined with...) Figure 3 and Figure 7 In mode 4, the inverter bridge's first switch S1, third switch S3, the body diode of the first synchronous rectifier switch Sd1, the second synchronous rectifier switch Sd2, the first soft-switching auxiliary switch Saux1, and the second soft-switching auxiliary switch Saux2 are turned on. At the beginning of this stage, the currents of the first energy storage inductor Lin1 and the second energy storage inductor Lin2 are equal to the current of the first resonant inductor Lr, and the first soft-switching auxiliary switches Saux1 and Saux2 are turned on with zero current. Subsequently, the current i of the first resonant inductor Lr... Lr As the current rises, the currents in the first energy storage inductor Lin1 and the second energy storage inductor Lin2 decrease. At the end of this stage, the body diode of the first synchronous rectifier switch Sd1 turns off with zero current, the current of the third switch S3 of the inverter bridge drops to zero and naturally commutates, and the current of the second synchronous rectifier switch naturally commutates.
[0109] Figure 8 This is an equivalent circuit diagram of mode 5 of a single-stage boost inverter circuit provided in an embodiment of the present invention. (Combined with...) Figure 3 and Figure 8 In mode 5, the first switch S1, the third switch S3, the second synchronous rectifier switch Sd2, the first soft-switching auxiliary switch Saux1, and the second soft-switching auxiliary switch Saux2 of the inverter bridge are turned on. During this stage, the current i in the first resonant inductor Lr... Lr As the current continues to rise, the current in the first energy storage inductor Lin1 and the second energy storage inductor Lin2 continues to decrease. At the end of this stage, the third switch S3 of the inverter bridge is turned off.
[0110] Figure 9 This is an equivalent circuit diagram of mode 6 of a single-stage boost inverter circuit provided in an embodiment of the present invention. (Combined with...) Figure 3 and Figure 9 In mode 6, the first switch S1, the second synchronous rectifier switch Sd2, the first soft-switching auxiliary switch Saux1, and the second soft-switching auxiliary switch Saux2 of the inverter bridge are turned on. During this stage, the junction capacitances of the third switch S3 and the fourth switch S4 of the inverter bridge resonate together with the first resonant inductor Lr. At the end of this stage, the junction capacitance voltage of the fourth switch S4 of the inverter bridge has resonated to zero.
[0111] Figure 10 This is an equivalent circuit diagram of mode 7 of a single-stage boost inverter circuit provided in an embodiment of the present invention. (Combined with...) Figure 3 and Figure 10In mode 7, the first switch S1, the fourth switch S4, the second synchronous rectifier switch Sd2, the first soft-switching auxiliary switch Saux1, and the second soft-switching auxiliary switch Saux2 of the inverter bridge are turned on. At the beginning of this stage, the fourth switch S4 of the inverter bridge is turned on with zero voltage, and the current i of the first resonant inductor Lr... Lr The current begins to decrease, while the currents in the first energy storage inductor Lin1 and the second energy storage inductor Lin2 increase. At the end of this phase, the current i in the first resonant inductor Lr... Lr As the current drops to zero, the first diode Din turns off with zero current.
[0112] Figure 11 This is an equivalent circuit diagram of mode 8 of a single-stage boost inverter circuit provided in an embodiment of the present invention. (Combined with...) Figure 3 and Figure 11 In mode 8, the first switch S1, the fourth switch S4, the second synchronous rectifier switch Sd2, the first soft-switching auxiliary switch Saux1, and the second soft-switching auxiliary switch Saux2 of the inverter bridge are turned on. During this stage, the current i in the first resonant inductor Lr... Lr Maintaining a zero current level, the current in the first energy storage inductor Lin1 and the second energy storage inductor Lin2 increases, and the first diode Din turns off. Later in this stage, the first switch S1 of the inverter bridge turns off, and the body diode of the second switch S2 of the inverter bridge naturally conducts freewheeling current. At the end of the stage, the second switch S2 of the inverter bridge turns on with zero voltage.
[0113] Thus, the single-stage boost inverter circuit provided in this embodiment of the invention sequentially completes the above 8 operating modes, thereby continuously converting the input low-voltage DC power into high-voltage AC power and outputting it to the downstream load RL.
[0114] As can be seen from the above operating modes, all switches in the inverter bridge module are turned on at zero voltage, the first soft-switching auxiliary switch and the second soft-switching auxiliary switch in the energy storage soft-switching module are turned on at zero current and turned off at zero voltage, and the first diode is turned on and off at zero current. Without increasing the switching losses, soft switching of all switches in the inverter bridge module is achieved. At the same time, the synchronous rectifier tube in the synchronous rectifier module is used as the reverse current conduction tube, which greatly reduces the circuit power conversion loss.
[0115] Based on the above embodiments, the present invention has also been experimentally verified. Figure 12 This is a waveform diagram of a DC input voltage and an AC output voltage provided for an embodiment of the present invention. Curve L8 represents the waveform of the DC input voltage Vin, and curve L9 represents the waveform of the AC output voltage Vo. Figure 12 It can be seen that the DC input voltage is much lower than the peak value of the AC output voltage. The single-stage boost inverter circuit provided in this embodiment of the invention has the function of single-stage boost inverter and the output voltage waveform is better.
[0116] Figure 13 This diagram illustrates the switching waveforms of an inverter bridge module in a single-stage boost inverter circuit according to an embodiment of the present invention. Curve L10 represents the drain-source voltage Vds2 of the second switch of the inverter bridge; curve L11 represents the gate-source voltage Vgs2 of the second switch of the inverter bridge; curve L12 represents the gate-source voltage Vgs1 of the first switch of the inverter bridge; curve L13 represents the drain-source voltage Vds1 of the first switch of the inverter bridge; curve L14 represents the drain-source voltage Vds4 of the fourth switch of the inverter bridge; curve L15 represents the gate-source voltage Vgs4 of the fourth switch of the inverter bridge; curve L16 represents the drain-source voltage Vds3 of the third switch of the inverter bridge; and curve L17 represents the gate-source voltage Vgs3 of the third switch of the inverter bridge. Figure 13 It can be seen that all switches of the inverter bridge module have achieved zero-voltage turn-on, thus completing the zero-voltage turn-on function.
[0117] Figure 14 This diagram illustrates the switching waveforms of an energy storage soft-switching module in a single-stage boost inverter circuit, as provided in an embodiment of the present invention. Curve L18 represents the drain-source voltage Vdsaux2 of the second soft-switching auxiliary switch; curve L19 represents the channel current Idsaux2 of the second soft-switching auxiliary switch; curve L20 represents the drain-source voltage Vdsaux1 of the first soft-switching auxiliary switch; and curve L21 represents the channel current Idsaux1 of the first soft-switching auxiliary switch. Figure 14 It can be seen that all switches in the energy storage soft-switching module achieve zero-current turn-on and turn-off without increasing other switching losses in the circuit.
[0118] It should be noted that in the above embodiments, the example described is that the bus capacitor module 60 is connected in series between the positive terminal of the input DC power supply Uin and the first power supply terminal (positive V+) of the inverter bridge module 30, but this is not intended to limit the invention. In other embodiments, see [link to other embodiments]. Figure 15 Alternatively, the bus capacitor module 60 can be connected in parallel between the first power supply terminal (positive V+) and the second power supply terminal (negative V-) of the inverter bridge module 30, and the second power supply terminal (negative V-) of the inverter bridge module 30 is electrically connected to the negative terminal (first ground GND1) of the input DC power supply. In this embodiment, the input DC power supply Uin charges the bus capacitor module 60 through the energy storage soft switch module 10, the synchronous rectification module 20, and the inverter bridge module 30 to generate a high-voltage DC power supply.
[0119] Based on the above embodiments, optionally, the switches in the inverter bridge module are all group III nitride transistors. This configuration can significantly increase the operating frequency of the power conversion device, reduce system losses, and decrease system size.
[0120] Based on the above embodiments, the single-stage boost inverter circuit may optionally include a dead-time unit, which is connected in series between the second combinational logic unit and the inverter bridge module 30 to realize dead-time control of the upper and lower half-bridges.
[0121] It should be noted that in the above embodiments, there are various ways to set up the energy storage soft-switching module, the synchronous rectification module, and the inverter bridge module, including circuit modules that can realize the energy storage soft-switching function, circuit modules that can realize the synchronous rectification function, and single-stage boost inverter circuits that can realize inversion, all of which are within the protection scope of this invention.
[0122] Based on the above embodiments, optionally, at least one of the energy storage soft-switching module 10, synchronous rectification module 20, and inverter bridge module 30 adopts an integrated packaging structure to improve the stability of the single-stage boost inverter circuit. For example, Figure 16 This is a schematic diagram of a synchronous rectification module provided in an embodiment of the present invention. See also... Figure 16 The synchronous rectification module 20 adopts an integrated package structure, including a first synchronous rectification switch Sd1 and a second synchronous rectification switch Sd2, both mounted within the package. Their respective insulating or semi-insulating substrates are in contact with the package base 206. The source electrode 83' of the second synchronous rectification switch Sd2 is electrically connected to a conductive structural portion of the package, such as the package base 206, or alternatively, to a source pin 203 of the package via a conductive bonding wire 71. The gate 81 of the first synchronous rectification switch Sd1 is electrically connected to the gate pin 202 of the package, for example, via a conductive bonding wire 72. The gate electrode 81' of the second synchronous rectification switch Sd2 can be electrically connected to a pin 201 of the package, for example, via a conductive bonding wire 73. The source electrode 83 of the first synchronous rectification switch Sd1 is electrically connected to the source electrode 83' of the second synchronous rectification switch Sd2, for example, via a conductive bonding wire 74. The source electrode 83 of the first synchronous rectifier switch Sd1 and the source electrode 83' of the second synchronous rectifier switch Sd2 are electrically connected to the intermediate pin 203 of the package, for example, by wire bonding one or both of these electrodes to an intermediate pin, such as via conductive bonding wire 71. The drain electrode 82 of the first synchronous rectifier switch Sd1 is electrically connected to the drain pin 205 of the package, for example, via conductive bonding wire 76. The drain electrode 82' of the second synchronous rectifier switch Sd2 is electrically connected to the drain pin 204 of the package, for example, via conductive bonding wire 75.
[0123] This invention also provides a control module for a single-stage boost inverter circuit, which can be used to control the single-stage boost inverter circuit provided in any embodiment of this invention. This control module can be implemented in hardware and / or software. Figure 17 This is a schematic diagram of the control module for a single-stage boost inverter circuit provided in an embodiment of the present invention. See also... Figure 17 The control module of the single-stage boost inverter circuit includes a modulation comparator unit 100, a first combinational logic unit 200, a second combinational logic unit 300, and a third combinational logic unit 400. The modulation comparator unit 100 includes a first input terminal 110, a second input terminal 120, a third input terminal 130, a first output terminal 140, a second output terminal 150, and a third output terminal 160. The first input terminal 110 receives a first modulated wave input signal Vsine, the second input terminal 120 receives a first carrier input signal Vtri, and the third input terminal 130 receives a second modulated wave input signal Vdc. The modulation comparator unit 100 processes the first carrier input signal Vtri, the first modulated wave input signal Vsine, and the second modulated wave input signal Vdc to generate a sinusoidal pulse width modulation signal Vspwm, a fixed pulse width modulation signal Vpwm, and a sinusoidal polarity determination signal Vpol, which are output from the first output terminal 140, the second output terminal 150, and the third output terminal 160 of the modulation comparator unit 100, respectively.
[0124] The first combinational logic unit 200 includes an input terminal 210 and an output terminal 220. The input terminal 210 of the first combinational logic unit 200 receives a sinusoidal polarity determination signal Vpol. The first combinational logic unit 200 generates a switching control signal for the synchronous rectification module from the sinusoidal polarity determination signal Vpol, and outputs it through the output terminal 220. For example, the switching control signal for the synchronous rectification module includes a first switching control signal Vgsd1 and a second switching control signal Vgsd2, which are output from different output terminals 220.
[0125] The second combinational logic unit 300 includes a first input terminal 310, a second input terminal 320, a third input terminal 330, and an output terminal 340. The first input terminal 310 receives a fixed pulse width modulation signal Vpwm, the second input terminal 320 receives a sinusoidal polarity determination signal Vpol, and the third input terminal 330 receives a sinusoidal pulse width modulation signal Vspwm. The second combinational logic unit 300 processes the sinusoidal polarity determination signal Vpol, the sinusoidal pulse width modulation signal Vspwm, and the fixed pulse width modulation signal Vpwm to generate switching control signals for the inverter bridge module, which are then output from the output terminal 340 of the second combinational logic unit 300. For example, the switching control signals for the inverter bridge module include signals Vgs1, Vgs2, Vgs3, and Vgs4, which are output from different output terminals 340.
[0126] The third combinational logic unit 400 includes a first input terminal 410, a second input terminal 420, and an output terminal 430. The first input terminal 410 receives a sinusoidal polarity determination signal Vpol, and the second input terminal 420 receives the switching control signal of the inverter bridge module. The third combinational logic unit 400 processes the sinusoidal polarity determination signal Vpol and the switching control signal of the inverter bridge module to generate a switching control signal for the energy storage soft-switching module, which is output by the output terminal 430 of the third combinational logic unit 400. For example, the switching control signal of the energy storage soft-switching module includes signals Vgsaux1 and Vgsaux2, which are output from the same or different output terminals 430.
[0127] The control module of this invention is configured such that, while performing single-stage boost inverter, it can control the zero-voltage turn-on of all switches in the inverter bridge module. The synchronous rectification module prevents input-output current backflow, allowing the switches in the inverter bridge module to switch alternately at low power consumption. Compared to the hard-switching operation in existing technologies, this significantly reduces system electromagnetic interference, improves system stability and reliability, reduces circuit switching losses, and enhances circuit power conversion efficiency. Furthermore, it reduces conduction losses, further improving circuit power conversion efficiency. Additionally, the control module provided in this invention has simple logic and is easy to implement.
[0128] Figure 18 This is a schematic diagram of a modulation comparator unit provided in an embodiment of the present invention. See also... Figure 18Based on the above embodiments, optionally, the modulation comparison unit 100 includes: an adder H1, a first comparator A1, a first inverter E1, a second comparator A2, a first OR gate F1, a third comparator A3, and a fourth comparator A4. The first input terminal of the adder H1 receives the first carrier input signal Vtri, and the second input terminal of the adder H1 receives the first modulated wave input signal Vsine. The first input terminal of the first comparator A1 is connected to the output terminal of the adder H1, and the second input terminal of the first comparator A1 receives the control module reference ground signal, which may be, for example, a ground signal GND. The input terminal of the first inverter E1 is connected to the output terminal of the first comparator A1. The first input terminal of the second comparator A2 receives the first modulated wave input signal Vsine, and the second input terminal of the second comparator A2 receives the first carrier input signal Vtri. The first input of the first OR gate F1 is connected to the output of the first inverter E1, and the second input of the first OR gate F1 is connected to the output of the second comparator A2; the output of the first OR gate F1 outputs a sinusoidal pulse width modulation signal Vspwm. The first input of the third comparator A3 receives the second modulated wave input signal Vdc, and the second input of the third comparator A3 receives the first carrier input signal Vtri; the output of the third comparator A3 outputs a fixed pulse width modulation signal Vpwm. The first input of the fourth comparator A4 receives the first modulated wave input signal Vsine, and the second input of the fourth comparator A4 receives the control module reference ground signal, which can be, for example, a ground signal GND; the output of the fourth comparator A4 outputs a sinusoidal polarity determination signal Vpol. This configuration in this embodiment of the invention simplifies the structure of the modulation comparison unit and makes it easy to implement.
[0129] Figure 19 This is a schematic diagram of the structure of a first combinational logic unit provided in an embodiment of the present invention. See also... Figure 19 Based on the above embodiments, optionally, the switching control signal of the synchronous rectification module includes a first switching control signal Vgsd1 and a second switching control signal Vgsd2. The first combinational logic unit 200 includes a second inverter E2, with a sinusoidal polarity determination signal Vpol input at its input terminal and a second switching control signal Vgsd2 output at its output terminal; the sinusoidal polarity determination signal Vpol serves as the first switching control signal Vgsd1. This configuration in the embodiments of the present invention simplifies the structure of the first combinational logic unit and makes it easy to implement.
[0130] Figure 20 This is a schematic diagram of the structure of a second combinational logic unit provided in an embodiment of the present invention. See also... Figure 20Based on the above embodiments, optionally, the switching control signals of the inverter bridge module include a third switching control signal Vgs1, a fourth switching control signal Vgs2, a fifth switching control signal Vgs3, and a sixth switching control signal Vgs4. The second combinational logic unit 300 includes: a first NAND gate P1, a second NAND gate P2, a third NAND gate P3, a first AND gate Q1, and a second AND gate Q2. The first input terminal of the first NAND gate P1 receives a sinusoidal polarity determination signal Vpol, and the second input terminal of the first NAND gate P1 receives a sinusoidal pulse width modulation signal Vspwm; the logic polarity of the first input terminal of the first NAND gate P1 is opposite to that of its second input terminal. The first input terminal of the second NAND gate P2 receives the sinusoidal pulse width modulation signal Vspwm, and the second input terminal of the second NAND gate P2 receives the sinusoidal polarity determination signal Vpol. The first input of the third NAND gate P3 receives a fixed pulse width modulation signal Vpwm. The second input of the third NAND gate P3 is connected to the output of the first NAND gate P1. The output of the third NAND gate P3 outputs a third switch control signal Vgs1. The first input of the first AND gate Q1 is connected to the output of the first NAND gate P1. The second input of the first AND gate Q1 receives the fixed pulse width modulation signal Vpwm. The output of the first AND gate Q1 outputs a fourth switch control signal Vgs2. The first input of the fourth NAND gate P4 receives the fixed pulse width modulation signal Vpwm. The second input of the fourth NAND gate P4 is connected to the output of the second NAND gate P2. The output of the fourth NAND gate P4 outputs a fifth switch control signal Vgs3. The first input of the second AND gate Q2 is connected to the output of the second NAND gate P2. The second input of the second AND gate Q2 receives the fixed pulse width modulation signal Vpwm. The output of the second AND gate Q2 outputs a sixth switch control signal Vgs4. This configuration in this embodiment of the invention simplifies the structure of the second combinational logic unit and makes it easy to implement.
[0131] Figure 21 This is a schematic diagram of the structure of a third combinational logic unit provided in an embodiment of the present invention. See also... Figure 21Based on the above embodiments, optionally, the switching control signals of the energy storage soft-switching module include a seventh switching control signal Vgsaux1 and an eighth switching control signal Vgsaux2. The third combinational logic unit 400 includes: a first delay unit Delay1, a second OR gate F2, a third AND gate Q3, a third inverter E3, a second delay unit Delay2, a third OR gate F3, a fourth AND gate Q4, and a fourth OR gate F4. The input terminal of the first delay unit Delay1 receives the third switching control signal Vgs1. The first input terminal of the second OR gate F2 is connected to the output terminal of the first delay unit Delay1, and the second input terminal of the second OR gate F2 receives the fourth switching control signal Vgs2. The first input terminal of the third AND gate Q3 is connected to the output terminal of the second OR gate F2, and the second input terminal of the third AND gate Q3 receives a sine polarity determination signal Vpol. The input terminal of the third inverter E3 receives the sine polarity determination signal Vpol. The input terminal of the second delay unit Delay2 receives the fifth switching control signal Vgs3. The first input of the third OR gate F3 is connected to the output of the second delay unit Delay2, and the second input of the third OR gate F3 receives the sixth switch control signal Vgs4. The first input of the fourth AND gate Q4 is connected to the output of the third inverter E3, and the second input of the fourth AND gate Q4 is connected to the output of the third OR gate F3. The first input of the fourth OR gate F4 is connected to the output of the third AND gate Q3, and the second input of the fourth OR gate F4 is connected to the output of the fourth AND gate Q4. The first output of the fourth OR gate F4 outputs the seventh switch control signal Vgsaux1, and the second output of the fourth OR gate F4 outputs the eighth switch control signal Vgsaux2, wherein the seventh switch control signal Vgsaux1 and the eighth switch control signal Vgsaux2 are the same signal. This configuration in this embodiment of the invention simplifies the structure of the third combinational logic unit and makes it easy to implement.
[0132] This invention also provides a power conversion device. The power conversion device includes a single-stage boost inverter circuit and a control module as provided in any embodiment of this invention; the control module is connected to the single-stage boost inverter circuit and is used to control the operating state of the single-stage boost inverter circuit. Since the power conversion device includes the single-stage boost inverter circuit provided in any embodiment of this invention, it has corresponding beneficial effects, which will not be elaborated further here. The control module can be the control module provided in any embodiment of this invention.
[0133] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.
Claims
1. A single-stage boost inverter circuit, characterized in that, include: The system includes an input DC power supply, a bus capacitor module, an energy storage soft-switching module, a synchronous rectification module, an inverter bridge module, and an output filter module; wherein, the input DC power supply and the bus capacitor module constitute a high-voltage DC power supply. The energy storage soft-switching module includes a switch input terminal and a switch output terminal, wherein the switch input terminal is connected to an input DC power supply; The synchronous rectification module includes a rectification input terminal, a first rectification output terminal, and a second rectification output terminal, wherein the rectification input terminal is electrically connected to the switch output terminal; The inverter bridge module includes a first power supply terminal, a second power supply terminal, a first output terminal, and a second output terminal. The first power supply terminal and the second power supply terminal are connected to the two ends of the high voltage DC power supply. The first output terminal is electrically connected to the first rectifier output terminal, and the second output terminal is electrically connected to the second rectifier output terminal. The output filtering module includes a first filtering input terminal, a second filtering input terminal, a first filtering output terminal, and a second filtering output terminal. The first filtering input terminal is electrically connected to the first output terminal of the inverter bridge module, and the second filtering input terminal is electrically connected to the second output terminal of the inverter bridge module. A load is connected between the first filtering output terminal and the second filtering output terminal. The energy storage soft-switching module includes a resonant inductor for achieving zero-voltage switching of the switches in the inverter bridge module; The synchronous rectification module is composed of controllable switching devices and is used to replace diodes to prevent current backflow. The energy storage soft-switching module includes: A first energy storage inductor, the first terminal of which is connected to the input DC power supply; A first soft-switching auxiliary switch, the first end of which is electrically connected to the second end of the first energy storage inductor, and the second end of which is electrically connected to the rectifier input terminal of the synchronous rectifier module; The second energy storage inductor, the first end of which is electrically connected to the rectifier input terminal of the synchronous rectifier module; A second soft-switching auxiliary switch is provided, with its second terminal electrically connected to the second terminal of the second energy storage inductor, and its first terminal connected to the input DC power supply. The first diode, wherein the anode of the first diode is electrically connected to the second terminal of the first energy storage inductor; A first resonant inductor, wherein a first end of the first resonant inductor is electrically connected to the cathode of the first diode, and a second end of the first resonant inductor is electrically connected to the second end of the second energy storage inductor.
2. The single-stage boost inverter circuit according to claim 1, characterized in that, The bus capacitor module is connected in series between the positive terminal of the input DC power supply and the first power supply terminal of the inverter bridge module, and the second power supply terminal of the inverter bridge module is electrically connected to the negative terminal of the input DC power supply. Alternatively, the bus capacitor module is connected in parallel between the first power supply terminal and the second power supply terminal of the inverter bridge module, and the second power supply terminal of the inverter bridge module is electrically connected to the negative terminal of the input DC power supply.
3. The single-stage boost inverter circuit according to claim 1, characterized in that, The synchronous rectification module includes: A first synchronous rectifier switch, the first end of which is electrically connected to the energy storage soft switch module, and the second end of which is electrically connected to the first output end of the inverter bridge module; The second synchronous rectifier switch has its first terminal electrically connected to the energy storage soft switch module and its second terminal electrically connected to the second output terminal of the inverter bridge module.
4. The single-stage boost inverter circuit according to claim 1, characterized in that, The inverter bridge module includes: The inverter bridge first switch has its first terminal connected to the positive terminal of the high voltage DC power supply, and its second terminal serves as the first output terminal of the inverter bridge module. The second switch of the inverter bridge has its first terminal electrically connected to the second terminal of the first switch of the inverter bridge, and its second terminal is connected to the negative terminal of the high voltage DC power supply. The third switch of the inverter bridge has its first terminal connected to the positive terminal of the high voltage DC power supply, and its second terminal serving as the second output terminal of the inverter bridge module. The fourth switch of the inverter bridge has its first terminal electrically connected to the second terminal of the third switch of the inverter bridge, and the second terminal of the fourth switch of the inverter bridge is connected to the negative terminal of the high voltage DC power supply.
5. A control module for a single-stage boost inverter circuit as described in claim 1, characterized in that, include: Modulation comparator unit, first combinational logic unit, second combinational logic unit and third combinational logic unit; The modulation comparison unit includes a first input terminal, a second input terminal, a third input terminal, a first output terminal, a second output terminal, and a third output terminal. The first input terminal of the modulation comparison unit receives a first modulated wave input signal, the second input terminal receives a first carrier input signal, and the third input terminal receives a second modulated wave input signal. The modulation comparison unit is used to process the first carrier input signal, the first modulation wave input signal and the second modulation wave input signal to generate a sinusoidal pulse width modulation signal, a fixed pulse width modulation signal and a sinusoidal polarity determination signal, which are output by the first output terminal, the second output terminal and the third output terminal of the modulation comparison unit, respectively. The first combinational logic unit includes an input terminal and an output terminal. The input terminal of the first combinational logic unit receives the sinusoidal polarity determination signal. The first combinational logic unit is used to generate a switching control signal for the synchronous rectification module from the sinusoidal polarity determination signal, and the signal is output from the output terminal of the first combinational logic unit. The second combinational logic unit includes a first input terminal, a second input terminal, a third input terminal, and an output terminal. The first input terminal of the second combinational logic unit receives the fixed pulse width modulation signal, the second input terminal receives the sinusoidal polarity determination signal, and the third input terminal receives the sinusoidal pulse width modulation signal. The second combinational logic unit processes the sinusoidal polarity determination signal, the sinusoidal pulse width modulation signal, and the fixed pulse width modulation signal to generate the switching control signal of the inverter bridge module, which is then output by the output terminal of the second combinational logic unit. The third combinational logic unit includes a first input terminal, a second input terminal, and an output terminal. The first input terminal receives the sinusoidal polarity determination signal, and the second input terminal receives the switching control signal of the inverter bridge module. The third combinational logic unit is used to process the sinusoidal polarity determination signal and the switching control signal of the inverter bridge module to generate the switching control signal of the energy storage soft switching module, and output it from the output terminal of the third combinational logic unit.
6. The control module of the single-stage boost inverter circuit according to claim 5, characterized in that, The modulation comparison unit includes: An adder, wherein the first input terminal of the adder receives the first carrier input signal, and the second input terminal of the adder receives the first modulated wave input signal; A first comparator, the first input of which is connected to the output of the adder, and the second input of which is a reference ground signal of the control module. The first inverter is connected to the output of the first comparator. The second comparator receives the first modulated wave input signal at its first input terminal and the first carrier input signal at its second input terminal. A first OR gate, the first input of which is connected to the output of the first inverter, and the second input of which is connected to the output of the second comparator; the output of the first OR gate outputs the sinusoidal pulse width modulation signal. A third comparator is configured such that the second modulated wave input signal is input to its first input terminal, the first carrier input signal is input to its second input terminal, and the fixed pulse width modulated signal is output to its output terminal. The fourth comparator receives the first modulated wave input signal at its first input terminal, the control module reference ground signal at its second input terminal, and the sinusoidal polarity determination signal at its output terminal.
7. The control module of the single-stage boost inverter circuit according to claim 5, characterized in that, The switching control signals of the synchronous rectification module include a first switching control signal and a second switching control signal; The first combinational logic unit includes: The second inverter receives the sinusoidal polarity determination signal at its input terminal and outputs the second switch control signal at its output terminal. The sinusoidal polarity determination signal serves as the first switch control signal.
8. The control module of the single-stage boost inverter circuit according to claim 5, characterized in that, The switching control signals of the inverter bridge module include a third switching control signal, a fourth switching control signal, a fifth switching control signal, and a sixth switching control signal; The second combinational logic unit includes: The first NAND gate has a sine polarity determination signal input to its first input terminal and a sine pulse width modulation signal input to its second input terminal; the logic polarities of the first input terminal and its second input terminal are opposite. The second NAND gate has the sinusoidal pulse width modulation signal input at its first input terminal and the sinusoidal polarity determination signal input at its second input terminal. The third NAND gate has the fixed pulse width modulation signal input at its first input terminal, the second input terminal of the third NAND gate connected to the output terminal of the first NAND gate, and the third switch control signal output at its output terminal. The first AND gate has its first input connected to the output of the first NAND gate, the second input of the first AND gate receives the fixed pulse width modulation signal, and the output of the first AND gate outputs the fourth switch control signal. The fourth NAND gate has the fixed pulse width modulation signal input at its first input terminal, the second input terminal of the fourth NAND gate connected to the output terminal of the second NAND gate, and the fifth switch control signal output at its output terminal. The second AND gate has its first input connected to the output of the second NAND gate. The second input of the second AND gate receives the fixed pulse width modulation signal, and the output of the second AND gate outputs the sixth switch control signal.
9. The control module of the single-stage boost inverter circuit according to claim 8, characterized in that, The switching control signals of the energy storage soft switch module include a seventh switching control signal and an eighth switching control signal; The third combinational logic unit includes: The first delay unit receives a third switch control signal at its input terminal. The second OR gate has its first input terminal connected to the output terminal of the first delay unit, and its second input terminal receives a fourth switch control signal. The third AND gate has its first input terminal connected to the output terminal of the second OR gate, and the second input terminal of the third AND gate receives the sinusoidal polarity determination signal. The third inverter is input to the sinusoidal polarity determination signal. The second delay unit receives the fifth switch control signal at its input terminal. The third OR gate has its first input connected to the output of the second delay unit, and its second input receives the sixth switch control signal. The fourth AND gate has its first input connected to the output of the third inverter, and its second input connected to the output of the third OR gate. The fourth OR gate has its first input connected to the output of the third AND gate, its second input connected to the output of the fourth AND gate, its first output outputting the seventh switch control signal, and its second output outputting the eighth switch control signal.