DC-AC converter and DC-DC conversion device

Abstract

The invention provides a direct current-alternating current converter and a direct current-direct current conversion device, and belongs to the field of electronic circuits. In the circuit, a first control end of a first conversion module and a second control end of a second conversion module are both used for accessing a first control signal, and a second control end of the first conversion module and a first control end of the second conversion module are both used for accessing a second control signal; when the first control signal is 0, a first resonant cavity is formed among the first conversion module, the second conversion module and the inductance module; when the first control signal is 1, a second resonant cavity is formed, and charges are recycled through the resonant cavity to provide drive for a power tube in the direct current-alternating current converter. Wherein the first control signal and the second control signal are opposite in phase. According to the invention, the conversion efficiency of the DC-DC conversion device in a high-frequency working scene can be improved, the punch-through current fault of the DC-AC converter can be avoided, and the electromagnetic anti-interference capability of the DC-DC conversion device can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a DC-AC converter and a DC-DC conversion device. Background Art

[0002] Isolated DC-DC converters are electronic devices that can convert power input voltage into different voltage outputs. They are often used in circuit design to achieve power management and control functions. An isolated DC-DC converter contains multiple switching tubes, which chop the input DC voltage into a pulse voltage through the high-speed switching action of the switching tubes, and then convert it into a DC output after the voltage is changed by the AC-DC converter, thereby achieving voltage conversion. In addition, in electronic equipment in industrial environments, isolated DC-DC converters are also used to provide reliable electrical isolation between high-voltage domains and low-voltage domains.

[0003] In the related technology, electromagnetic coils can generally be deployed in DC-DC converters, and the electrical isolation function and energy transfer function of the DC-DC converter can be realized through the magnetic isolation of the electromagnetic coils. Among them, since the electromagnetic coil can only transfer AC energy, the DC-DC converter needs to convert the DC voltage into AC voltage first. The DC-DC converter often uses a power amplifier or oscillator circuit to convert the DC voltage into AC voltage, and then realizes AC energy transfer through the electromagnetic coil.

[0004] However, when implementing a DC-DC converter based on the related technology, since the power amplifier circuit in the DC-DC converter is implemented by multiple driving power tubes, when the DC-DC converter is applied to high-frequency scenarios, the loss of the driving power tube will increase significantly, which will lead to a significant decrease in the conversion efficiency between DC voltage and AC voltage. Alternatively, when the DC-DC converter is applied to a scenario with limited electromagnetic radiation, the oscillator circuit will face problems such as high dipole radiation and through-current. Therefore, the solutions of the related technology have the problems of low conversion efficiency between DC voltage and AC voltage and limitations of the application scenarios of the DC-DC converter. Summary of the invention

[0005] The purpose of the present application is to provide a DC-AC converter and a DC-DC conversion device, which can improve the conversion efficiency of the DC-DC conversion device in high-frequency working scenarios, avoid the occurrence of through-current failures of the DC-AC converter, and improve the electromagnetic anti-interference capability of the DC-DC conversion device.

[0006] The embodiment of the present application is implemented as follows:

[0007] According to a first aspect of an embodiment of the present application, a DC-AC converter is provided, the DC-AC converter comprising: a first conversion module, an inductor module and a second conversion module;

[0008] The first end of the first conversion module is used to access the power supply voltage, the first control end of the first conversion module is used to access the first control signal, the second control end of the first conversion module is used to access the second control signal, the second end of the first conversion module is connected to the first end of the inductor module, the third end of the first conversion module is connected to the second end of the inductor module, and the second control signal is an inverted level signal of the first control signal;

[0009] The third end of the inductor module is connected to the first end of the second conversion module, the fourth end of the inductor module is connected to the second end of the second conversion module, the first control end of the second conversion module is used to access the second control signal, the second control end of the second conversion module is used to access the first control signal, and the third end of the second conversion module is grounded;

[0010] If the first control signal connected to the first control terminal of the first conversion module and the second control terminal of the second conversion module is at a low level, the inductor module, the first conversion module and the second conversion module form a first resonant cavity, so that the DC-AC converter realizes charge recovery through the first resonant cavity;

[0011] If the first control terminal of the first conversion module and the second control terminal of the second conversion module receive the first control signal at a high level, the inductor module and the first conversion module and the second conversion module form a second resonant cavity, so that the DC-AC converter realizes charge recovery through the second resonant cavity.

[0012] As a possible implementation, the first conversion module includes: a first power amplifier unit, a first driving unit, and a second driving unit;

[0013] The first end of the first power amplifier unit is used to access the power supply voltage, and one end of the first driving unit and one end of the second driving unit are both connected to the first end of the first power amplifier unit;

[0014] The control end of the first driving unit is used to access the first control signal, the control end of the second driving unit is used to access the second control signal, the other end of the first driving unit and the second end of the first power amplifier unit are both connected to the first end of the inductor module, and the other end of the second driving unit and the third end of the first power amplifier unit are both connected to the second end of the inductor module.

[0015] As a possible implementation, the first power amplifier unit includes: a first power tube and a second power tube;

[0016] The source of the first power tube and the source of the second power tube are both used to access the power supply voltage, the gate of the first power tube is connected to the drain of the second power tube, the drain of the first power tube is connected to the gate of the second power tube, the drain of the first power tube is also connected to the first end of the inductor module, and the drain of the second power tube is also connected to the second end of the inductor module.

[0017] As a possible implementation, the first driving unit includes: a first P-type metal oxide semiconductor transistor, and the second driving unit includes: a second P-type metal oxide semiconductor transistor;

[0018] The gate of the first P-type metal oxide semiconductor transistor is used to receive the first control signal, the source of the first P-type metal oxide semiconductor transistor is connected to the source of the first power tube, and the drain of the first P-type metal oxide semiconductor transistor is respectively connected to the drain of the first power tube and the first end of the inductor module;

[0019] The gate of the second P-type metal oxide semiconductor transistor is used to access the second control signal, the source of the second P-type metal oxide semiconductor transistor is connected to the source of the second power tube, and the drain of the second P-type metal oxide semiconductor transistor is respectively connected to the drain of the second power tube and the second end of the inductor module.

[0020] As a possible implementation, the second conversion module includes: a second power amplifier unit, a third driving unit and a fourth driving unit;

[0021] A first end of the second power amplifier unit and one end of the third driving unit are both connected to the third end of the inductor module, one end of the fourth driving unit and the second end of the second power amplifier unit are both connected to the fourth end of the inductor module, a control end of the third driving unit is used to access the second control signal, a control end of the fourth driving unit is used to access the first control signal, and a third end of the second power amplifier unit, another end of the third driving unit and another end of the fourth driving unit are all grounded.

[0022] As a possible implementation, the second power amplifier unit includes: a third power tube and a fourth power tube;

[0023] The drain of the third power tube is connected to the third end of the inductor module, the drain of the fourth power tube is connected to the fourth end of the inductor module, the gate of the third power tube is connected to the drain of the fourth power tube, the drain of the third power tube is also connected to the gate of the fourth power tube, and the source of the third power tube and the source of the fourth power tube are both grounded.

[0024] As a possible implementation, the third driving unit includes: a first N-type metal oxide semiconductor transistor, and the fourth driving unit includes: a second N-type metal oxide semiconductor transistor;

[0025] The gate of the first N-type metal oxide semiconductor transistor is used to receive the second control signal, the drain of the first N-type metal oxide semiconductor transistor is connected to the third end of the inductor module, and the source of the first N-type metal oxide semiconductor transistor is grounded;

[0026] The gate of the second N-type metal oxide semiconductor transistor is used to access the first control signal, the drain of the second N-type metal oxide semiconductor transistor is connected to the fourth end of the inductor module, and the source of the second N-type metal oxide semiconductor transistor is grounded.

[0027] As a possible implementation, the inductor module includes: a first inductor and a second inductor;

[0028] One end of the first inductor is respectively connected to the drain of the first P-type metal oxide semiconductor transistor and the drain of the first power tube, and the other end of the first inductor is respectively connected to the drain of the first N-type metal oxide semiconductor transistor and the drain of the third power tube;

[0029] One end of the second inductor is respectively connected to the drain of the second P-type metal oxide semiconductor transistor and the drain of the second power tube, and the other end of the second inductor is respectively connected to the drain of the second N-type metal oxide semiconductor transistor and the drain of the fourth power tube;

[0030] If the first control signal connected to the gate of the first P-type metal oxide semiconductor transistor and the gate of the second N-type metal oxide semiconductor transistor is at a low level, the second inductor and the parasitic capacitance of the second P-type metal oxide semiconductor transistor, the parasitic capacitance of the second power tube, the parasitic capacitance of the second N-type metal oxide semiconductor transistor and the parasitic capacitance of the fourth power tube form a first resonant cavity;

[0031] If the first control signal connected to the gate of the first P-type metal oxide semiconductor transistor and the gate of the second N-type metal oxide semiconductor transistor is at a high level, the first inductor and the parasitic capacitance of the first P-type metal oxide semiconductor transistor, the parasitic capacitance of the first power tube, the parasitic capacitance of the first N-type metal oxide semiconductor transistor and the parasitic capacitance of the third power tube form a second resonant cavity.

[0032] As a possible implementation, the DC-AC converter further includes: a first capacitor, a second capacitor, a third capacitor and a fourth capacitor;

[0033] A first end of the inductor module is connected to one end of the first capacitor, a second end of the inductor module is connected to one end of the second capacitor, a third end of the inductor module is connected to one end of the third capacitor, a fourth end of the inductor module is connected to one end of the fourth capacitor, and the other end of the first capacitor, the other end of the second capacitor, the other end of the third capacitor and the other end of the fourth capacitor are all grounded;

[0034] If the first control signal connected to the first control terminal of the first conversion module and the second control terminal of the second conversion module is at a low level, the inductor module, the first conversion module, the second conversion module, the second capacitor and the fourth capacitor form a first resonant cavity;

[0035] If the first control terminal of the first conversion module and the second control terminal of the second conversion module receive the first control signal at a high level, the inductor module, the first conversion module, the second conversion module, the first capacitor and the third capacitor form a second resonant cavity.

[0036] A second aspect of the embodiments of the present application provides a DC-DC conversion device, the DC-DC conversion device comprising: the DC-AC converter, the isolation electromagnetic coil and the AC-DC converter described in the first aspect above;

[0037] The output end of the DC-AC converter is connected to the input end of the AC-DC converter via an isolation electromagnetic coil, and the output end of the AC-DC converter is used to connect to an external load.

[0038] The beneficial effects of the embodiments of the present application include:

[0039] A DC-AC converter provided in an embodiment of the present application is connected to DC power provided by an external DC power supply through a first end of a first conversion module, and controls the on and off of each power switch and each power tube in the DC-AC converter by applying a first control signal to a first control end of the first conversion module and a second control end of the second conversion module via an external controller, and applying a second control signal to the second control end of the first conversion module and the first control end of the second conversion module, so as to convert the DC power, and output the converted AC power through the first end, the second end, the third end and the fourth end of the inductor module. The first control signal and the second control signal are mutually anti-phase signals. When the DC-AC converter works in the first phase, the first control signal applied by the first control end of the first conversion module is at a low level, and the second control signal applied by the first control end of the second conversion module is at a high level. The inductor element between the second end and the fourth end of the inductor module and the driving switch and the power tube between the first end and the third end of the first conversion module and the parasitic capacitance of the driving switch and the power tube between the first end and the third end of the second conversion module form a first resonant cavity, and the charge recovery of the DC-AC converter is realized through the first resonant cavity; when the DC-AC converter works in the second phase, the first control signal applied by the first control end of the first conversion module is at a high level, and the second control signal applied by the first control end of the second conversion module is at a low level. The inductor element between the first end and the third end of the inductor module and the driving switch and the power tube between the first end and the second end of the first conversion module and the parasitic capacitance of the driving switch and the power tube between the first end and the second end of the second conversion module form a second resonant cavity, and the charge recovery of the DC-AC converter is realized through the second resonant cavity. The inductor and parasitic capacitor in the DC-AC converter provided by the present application resonate, which can effectively reduce the switching loss of the MOS tube in the conversion module; the inductor connected in series between the first conversion module and the second conversion module can provide high-frequency impedance, thereby preventing the occurrence of through-current; the circuit topology of the first conversion module and the second conversion module is symmetrical, so that the common-mode voltage variation of the inductor module is small, thereby reducing dipole radiation to reduce electromagnetic radiation. In this way, the conversion efficiency of the DC-DC converter in high-frequency working scenarios can be improved, the through-current failure of the DC-AC converter can be avoided, and the electromagnetic anti-interference ability of the DC-DC converter can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 It is a structural schematic diagram of an existing isolated DC-DC conversion device;

[0042] Figure 2 A schematic diagram of the structure of a DC-AC converter provided in an embodiment of the present application;

[0043] Figure 3 A schematic diagram of the structure of a conversion module provided in an embodiment of the present application;

[0044] Figure 4 A circuit diagram of a DC-AC converter provided in an embodiment of the present application;

[0045] Figure 5 A circuit diagram of another DC-AC converter provided in an embodiment of the present application;

[0046] Figure 6 A schematic diagram of the working state of the first DC-AC converter provided in an embodiment of the present application;

[0047] Figure 7 A schematic diagram of the working state of the second DC-AC converter provided in an embodiment of the present application;

[0048] Figure 8 A schematic diagram of the working state of the third DC-AC converter provided in the embodiment of the present application;

[0049] Fig. 9 A working parameter curve diagram of a DC-AC converter provided in an embodiment of the present application;

[0050] Fig.10 A schematic diagram of conversion efficiency of a DC-DC converter provided in an embodiment of the present application;

[0051] Fig.11 A schematic diagram of an electromagnetic interference test result provided in an embodiment of the present application;

[0052] Fig.12 Another schematic diagram of electromagnetic interference test results provided in an embodiment of the present application;

[0053] Fig.13 A schematic diagram of the structure of a DC-DC conversion device provided in an embodiment of the present application.

[0054] Description of the drawings: 10: DC-DC converter; 101: DC-AC converter; 1011: first conversion module; 111: first power amplifier unit; 1111: first power tube; 1112: second power tube; 112: first driving unit; 1121: first P-type metal oxide semiconductor transistor; 113: second driving unit; 1131: second P-type metal oxide semiconductor transistor; 1012: inductor module; 121: first inductor; 122: second inductor; 10 13: second conversion module; 131: second power amplifier unit; 1311: third power tube; 1312: fourth power tube; 132: third driving unit; 1321: first N-type metal oxide semiconductor transistor; 133: fourth driving unit; 1331: second N-type metal oxide semiconductor transistor; 1014: first capacitor; 1015: second capacitor; 1016: third capacitor; 1017: fourth capacitor; 102: isolated electromagnetic coil; 103: AC-DC converter. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0056] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0057] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0058] In the description of the present application, it should be noted that the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0059] At present, electromagnetic coils are often deployed in DC-DC converters, and the electrical isolation function and energy transfer function of the DC-DC converter are realized through the electromagnetic isolation of the electromagnetic coils. Among them, since the electromagnetic coil can only transfer AC energy, the DC-DC converter needs to convert the DC voltage into AC voltage first. The DC-DC converter often uses a power amplifier or oscillator circuit to convert the DC voltage into AC voltage, and then realizes AC energy transfer through the electromagnetic coil. However, when the DC-DC converter is applied to high-frequency scenarios, this solution will cause the switching loss of the driving power tube in the power amplifier circuit of the DC-DC converter to increase significantly, thereby causing the conversion efficiency of the DC-DC converter to drop significantly. Alternatively, when the DC-DC converter is applied to a scenario with limited electromagnetic radiation, the oscillator circuit in the DC-DC converter will face problems such as high dipole radiation and through-current.

[0060] To this end, the embodiment of the present application provides a DC-AC converter, which is connected to the power supply voltage through the first end of the first conversion module, and controls the on and off of the driving MOS tube and the power tube in the first conversion module and the second conversion module by applying the first control signal and the second control signal to the first conversion module and the second conversion module; at the same time, the inductance in the inductor module and the parasitic capacitance in the first conversion module and the second conversion module form a resonant cavity to absorb the excess charge when the DC-AC converter is running, thereby realizing charge recovery. Among them, the inductance and parasitic capacitance in the DC-AC converter provided by the present application resonate, which can effectively reduce the switching loss of the MOS tube in the conversion module; the inductance connected in series between the first conversion module and the second conversion module can provide high-frequency impedance, thereby preventing the occurrence of through-current; the circuit topology of the first conversion module and the second conversion module is symmetrical, so that the common-mode voltage variation of the inductor module is small, thereby reducing the dipole radiation, so as to reduce electromagnetic radiation. In this way, it is possible to achieve the effect of improving the conversion efficiency of the DC-DC converter in high-frequency working scenarios, avoiding the occurrence of through-current failures of the DC-AC converter, and improving the electromagnetic anti-interference ability of the DC-DC converter.

[0061] Figure 1 is a schematic diagram of the structure of an existing isolated DC-DC converter, see Figure 1The existing isolated DC-DC converter is composed of a DC-AC converter, an electromagnetic isolation coil and an AC-DC converter. The DC-AC converter in the isolated DC-DC converter is implemented by a power amplifier PA or an oscillation circuit OSC. In high-frequency application scenarios, the power amplifier in the DC-AC converter needs to be driven by a power tube, which will cause a significant increase in the driving power loss, thereby reducing the conversion efficiency of the isolated DC-DC converter. Alternatively, in application scenarios where electromagnetic radiation is limited, the oscillation circuit in the DC-AC converter will face a series of problems such as high dipole radiation and through-current failure, thereby reducing the safety and reliability of the isolated DC-DC converter.

[0062] The DC-AC converter and the DC-DC conversion device provided in the embodiments of the present application are explained in detail below with reference to the accompanying drawings.

[0063] Figure 2 A schematic diagram of the structure of a DC-AC converter provided in this application, see Figure 2 The DC-AC converter 101 provided in the embodiment of the present application includes: a first conversion module 1011 , an inductor module 1012 and a second conversion module 1013 .

[0064] The first end of the first conversion module 1011 is used to access the power supply voltage, the first control end of the first conversion module 1011 is used to access the first control signal, the second control end of the first conversion module 1011 is used to access the second control signal, the second end of the first conversion module 1011 is connected to the first end of the inductor module 1012, the third end of the first conversion module 1011 is connected to the second end of the inductor module 1012, and the second control signal is an inverted level signal of the first control signal.

[0065] Optionally, the power supply voltage is a DC voltage provided by an external DC power supply, the first control signal and the second control signal are implemented by high and low level signals, and the first control signal and the second control signal are both provided by a controller outside the DC-AC converter 101.

[0066] Optionally, the first conversion module 1011 includes multiple driving switches and multiple power tubes. The first control end and the second control end of the first conversion module 1011 refer to the gate of the driving switch in the first conversion module 1011, that is, the driving switch in the first conversion module 1011 is turned on or off under the action of the first control signal and the second control signal.

[0067] Optionally, the inductor module 1012 is implemented by multiple inductive components. The inductor module 1012 is connected in series between the first conversion module 1011 and the second conversion module 1013. The inductor module 1012 can provide a high-frequency impedance for the DC-AC converter 101 to prevent the DC-AC converter 101 from having a through-current fault.

[0068] Optionally, the first control signal and the second control signal are inverted signals, that is, when the first control signal is at a low level 0, the second control signal is at a high level 1; conversely, when the first control signal is at a high level 1, the second control signal is at a low level 0.

[0069] The third end of the inductor module 1012 is connected to the first end of the second conversion module 1013, the fourth end of the inductor module 1012 is connected to the second end of the second conversion module 1013, the first control end of the second conversion module 1013 is used to access the second control signal, the second control end of the second conversion module 1013 is used to access the first control signal, and the third end of the second conversion module 1013 is grounded.

[0070] Optionally, the second conversion module 1013 includes multiple driving switches and multiple power tubes. The first control end and the second control end of the second conversion module 1013 refer to the gate of the driving switch in the second conversion module 1013, that is, the driving switch in the second conversion module 1013 is turned on or off under the action of the first control signal and the second control signal.

[0071] Optionally, the first conversion module 1011 and the second conversion module 1013 are symmetrical circuit topology structures, and the internal circuits of the first conversion module 1011 and the second conversion module 1013 are also symmetrical circuit topology structures. Among them, the completely symmetrical power stage circuit topology can make the common mode voltage variation of the inductor element in the inductor module 1012 smaller, thereby reducing dipole radiation, so as to reduce electromagnetic radiation in the DC-AC converter 101.

[0072] Optionally, the first end and the second end of the inductor module 1012 are not only connected to the first conversion module 1011, the third end and the fourth end of the inductor module 1012 are not only connected to the second conversion module 1013, but the first end, the second end, the third end and the fourth end of the inductor module 1012 also serve as the output end of the DC-AC converter 101.

[0073] In addition, the DC-AC converter 101 serves as a primary converter in the DC-DC conversion device 10 , and the DC-AC converter 101 is used to convert DC power provided by an external DC power source into AC power.

[0074] If the first control signal connected to the first control terminal of the first conversion module 1011 and the second control terminal of the second conversion module 1013 is at a low level, the inductor module 1012 forms a first resonant cavity with the first conversion module 1011 and the second conversion module 1013, so that the DC-AC converter 101 realizes charge recovery through the first resonant cavity.

[0075] Optionally, when the first control signal input to the first control end of the first conversion module 1011 is a low level 0, the second control signal input to the first control end of the second conversion module 1013 is a high level 1, the driving switch of the first control end of the first conversion module 1011 is turned on, and the driving switch of the first control end of the second conversion module 1013 is also turned on, the inductor element between the first end and the third end of the inductor module 1012 starts to be charged, and a first resonant cavity is formed between the inductor element between the second end and the fourth end of the inductor module 1012 and the driving switch and power tube of the second control end of the first conversion module 1011 and the driving switch and power tube of the second control end of the second conversion module 1013, the inductor element between the second end and the fourth end of the inductor module 1012 resonates with the parasitic capacitance of each driving switch and each power tube in the resonant cavity, and charge recovery of the DC-AC converter 101 is realized through the first resonant cavity.

[0076] If the first control signal connected to the first control terminal of the first conversion module 1011 and the second control terminal of the second conversion module 1013 is at a high level, the inductor module 1012 forms a second resonant cavity with the first conversion module 1011 and the second conversion module 1013, so that the DC-AC converter 101 realizes charge recovery through the second resonant cavity.

[0077] Optionally, when the first control signal input to the first control end of the first conversion module 1011 is a high level 1, the second control signal input to the second control end of the first conversion module 1011 is a low level 0, the first control signal input to the second control end of the second conversion module 1013 is a low level 0, the driving switch of the second control end of the first conversion module 1011 is turned on, and the driving switch of the second control end of the second conversion module 1013 is also turned on, the inductor element between the second end and the fourth end of the inductor module 1012 starts to charge, and the inductor element between the first end and the third end of the inductor module 1012 and the driving switch and power tube of the first control end of the first conversion module 1011 and the driving switch and power tube of the first control end of the second conversion module 1013 form a second resonant cavity, the inductor element between the first end and the third end of the inductor module 1012 resonates with the parasitic capacitance of each driving switch and each power tube in the resonant cavity, and the charge recovery of the DC-AC converter 101 is realized through the second resonant cavity.

[0078] In an embodiment of the present application, direct current provided by an external direct current power supply is connected through the first end of the first conversion module, and a first control signal applied to the first control end of the first conversion module and the second control end of the second conversion module by an external controller and a second control signal applied to the second control end of the first conversion module and the first control end of the second conversion module are used to control the on and off of each power switch and each power tube in the direct current-to-alternating current converter to achieve conversion of direct current, and output the converted alternating current through the first end, the second end, the third end and the fourth end of the inductor module. The first control signal and the second control signal are mutually anti-phase signals. When the DC-AC converter works in the first phase, the first control signal applied by the first control end of the first conversion module is at a low level, and the second control signal applied by the first control end of the second conversion module is at a high level. The inductor element between the second end and the fourth end of the inductor module and the driving switch and the power tube between the first end and the third end of the first conversion module and the parasitic capacitance of the driving switch and the power tube between the first end and the third end of the second conversion module form a first resonant cavity, and the charge recovery of the DC-AC converter is realized through the first resonant cavity; when the DC-AC converter works in the second phase, the first control signal applied by the first control end of the first conversion module is at a high level, and the second control signal applied by the first control end of the second conversion module is at a low level. The inductor element between the first end and the third end of the inductor module and the driving switch and the power tube between the first end and the second end of the first conversion module and the parasitic capacitance of the driving switch and the power tube between the first end and the second end of the second conversion module form a second resonant cavity, and the charge recovery of the DC-AC converter is realized through the second resonant cavity. The inductor and parasitic capacitor in the DC-AC converter provided by the present application resonate, which can effectively reduce the switching loss of the MOS tube in the conversion module; the inductor connected in series between the first conversion module and the second conversion module can provide high-frequency impedance, thereby preventing the occurrence of through-current; the circuit topology of the first conversion module and the second conversion module is symmetrical, so that the common-mode voltage variation of the inductor module is small, thereby reducing dipole radiation to reduce electromagnetic radiation. In this way, the conversion efficiency of the DC-DC converter in high-frequency working scenarios can be improved, the through-current failure of the DC-AC converter can be avoided, and the electromagnetic anti-interference ability of the DC-DC converter can be improved.

[0079] For a possible implementation, see Figure 3 The first conversion module 1011 in the DC-AC converter 101 provided in the embodiment of the present application includes: a first power amplifier unit 111 , a first driving unit 112 and a second driving unit 113 .

[0080] A first end of the first power amplifier unit 111 is used to access a power supply voltage, and one end of the first driving unit 112 and one end of the second driving unit 113 are both connected to the first end of the first power amplifier unit 111 .

[0081] Optionally, the first power amplifier unit 111 is used to amplify the DC voltage input to the first conversion module 1011 , and the first driving unit 112 and the second driving unit 113 are used to adjust the working state of the first power amplifier unit 111 .

[0082] The control end of the first driving unit 112 is used to access the first control signal, the control end of the second driving unit 113 is used to access the second control signal, the other end of the first driving unit 112 and the second end of the first power amplifier unit 111 are both connected to the first end of the inductor module 1012, and the other end of the second driving unit 113 and the third end of the first power amplifier unit 111 are both connected to the second end of the inductor module 1012.

[0083] Optionally, the first drive unit 112 is turned on or off under the action of a first control signal, and the second drive unit 113 is turned on or off under the action of a second control signal. The first control signal and the second control signal are inverted signals, that is, the on-off states of the first drive unit 112 and the second drive unit 113 are opposite, and the models of the drive switches in the first drive unit 112 and the second drive unit 113 are the same.

[0084] Among them, the other end of the first driving unit 112 and the second end of the first power amplifier unit 111 are both connected to the first end of the inductor module 1012, and the inductor element between the first end and the third end of the inductor module 1012 will resonate with the parasitic capacitance of the driving switch in the first driving unit 112 and the parasitic capacitance of the power tube at the second end of the first power amplifier unit 111 at a certain phase. Similarly, the other end of the second driving unit 113 and the third end of the first power amplifier unit 111 are connected to the second end of the inductor module 1012, and the inductor element between the second end and the fourth end of the inductor module 1012 will resonate with the parasitic capacitance of the driving switch in the second driving unit 113 and the parasitic capacitance of the power tube at the third end of the first power amplifier unit 111 at a certain phase.

[0085] For a possible implementation, see Figure 4 The first power amplifier unit 111 in the DC-AC converter 101 provided in the embodiment of the present application includes: a first power tube 1111 and a second power tube 1112 .

[0086] The source of the first power tube 1111 and the source of the second power tube 1112 are both used to access the power supply voltage, the gate of the first power tube 1111 is connected to the drain of the second power tube 1112, the drain of the first power tube 1111 is connected to the gate of the second power tube 1112, the drain of the first power tube 1111 is also connected to the first end of the inductor module 1012, and the drain of the second power tube 1112 is also connected to the second end of the inductor module 1012.

[0087] Optionally, the first power tube 1111 and the second power tube 1112 are both N-type power tubes, and the first power tube 1111 and the second power tube 1112 can amplify and modulate the direct current provided by an external direct current power supply.

[0088] For a possible implementation, see Figure 4 The first driving unit 112 in the DC-AC converter 101 provided in the embodiment of the present application includes: a first P-type metal oxide semiconductor transistor 1121 , and the second driving unit 113 includes: a second P-type metal oxide semiconductor transistor 1131 .

[0089] The gate of the first P-type metal oxide semiconductor transistor 1121 is used to access the first control signal, the source of the first P-type metal oxide semiconductor transistor 1121 is connected to the source of the first power tube 1111, and the drain of the first P-type metal oxide semiconductor transistor 1121 is respectively connected to the drain of the first power tube 1111 and the first end of the inductor module 1012.

[0090] Optionally, the first P-type metal oxide semiconductor transistor 1121 is turned on or off under the action of a first control signal. When the first control signal is at a low level, the first P-type metal oxide semiconductor transistor 1121 is turned on. Conversely, when the first control signal is at a high level, the first P-type metal oxide semiconductor transistor 1121 is turned off or cut off.

[0091] The gate of the second P-type metal oxide semiconductor transistor 1131 is used to access the second control signal, the source of the second P-type metal oxide semiconductor transistor 1131 is connected to the source of the second power tube 1112, and the drain of the second P-type metal oxide semiconductor transistor 1131 is respectively connected to the drain of the second power tube 1112 and the second end of the inductor module 1012.

[0092] Optionally, the second P-type metal oxide semiconductor transistor 1131 is turned on or off under the action of the first control signal. When the second control signal is at a low level, the second P-type metal oxide semiconductor transistor 1131 is turned on. Conversely, when the second control signal is at a high level, the second P-type metal oxide semiconductor transistor 1131 is turned off or cut off.

[0093] For a possible implementation, see Figure 3 The second conversion module 1013 in the DC-AC converter 101 provided in the embodiment of the present application includes: a second power amplifier unit 131 , a third driving unit 132 and a fourth driving unit 133 .

[0094] A first end of the second power amplifier unit 131 and one end of the third driving unit 132 are both connected to the third end of the inductor module 1012, one end of the fourth driving unit 133 and the second end of the second power amplifier unit 131 are both connected to the fourth end of the inductor module 1012, a control end of the third driving unit 132 is used to access the second control signal, a control end of the fourth driving unit 133 is used to access the first control signal, and a third end of the second power amplifier unit 131, another end of the third driving unit 132 and another end of the fourth driving unit 133 are all grounded.

[0095] Optionally, the third driving unit 132 and the fourth driving unit 133 are both used to adjust the working state of the second power amplifier unit 131. The third driving unit 132 is turned on or off under the action of the second control signal, and the fourth driving unit 133 is turned on or off under the action of the first control signal. The first control signal and the second control signal are inverted signals, that is, the on-off states of the third driving unit 132 and the fourth driving unit 133 are opposite, and the models of the driving switches in the third driving unit 132 and the fourth driving unit 133 are the same.

[0096] Among them, one end of the third driving unit 132 and the first end of the second power amplifier unit 131 are both connected to the third end of the inductor module 1012, and the inductor element between the first end and the third end of the inductor module 1012 will resonate with the parasitic capacitance of the driving switch in the third driving unit 132 and the parasitic capacitance of the power tube at the first end of the second power amplifier unit 131 at a certain phase. Similarly, one end of the fourth driving unit 133 and the second end of the second power amplifier unit 131 are connected to the fourth end of the inductor module 1012, and the inductor element between the second end and the fourth end of the inductor module 1012 will resonate with the parasitic capacitance of the driving switch in the fourth driving unit 133 and the parasitic capacitance of the power tube at the second end of the second power amplifier unit 131 at a certain phase.

[0097] For a possible implementation, see Figure 4 The second power amplifier unit 131 in the DC-AC converter 101 provided in the embodiment of the present application includes: a third power tube 1311 and a fourth power tube 1312 .

[0098] The drain of the third power tube 1311 is connected to the third end of the inductor module 1012, the drain of the fourth power tube 1312 is connected to the fourth end of the inductor module 1012, the gate of the third power tube 1311 is connected to the drain of the fourth power tube 1312, the drain of the third power tube 1311 is also connected to the gate of the fourth power tube 1312, and the source of the third power tube 1311 and the source of the fourth power tube 1312 are both grounded.

[0099] Optionally, the third power tube 1311 and the fourth power tube 1312 are both P-type power tubes.

[0100] For a possible implementation, see Figure 4 The third driving unit 132 in the DC-AC converter 101 provided in the embodiment of the present application includes: a first N-type metal oxide semiconductor transistor 1321 , and the fourth driving unit 133 includes: a second N-type metal oxide semiconductor transistor 1331 .

[0101] The gate of the first N-type metal oxide semiconductor transistor 1321 is used to receive the second control signal, the drain of the first N-type metal oxide semiconductor transistor 1321 is connected to the third end of the inductor module 1012, and the source of the first N-type metal oxide semiconductor transistor 1321 is grounded.

[0102] Optionally, the first N-type metal oxide semiconductor transistor 1321 is turned on or off under the action of a second control signal. When the second control signal is at a low level, the first N-type metal oxide semiconductor transistor 1321 is turned off or cut off. Conversely, when the second control signal is at a high level, the first N-type metal oxide semiconductor transistor 1321 is turned on.

[0103] The gate of the second N-type metal oxide semiconductor transistor 1331 is used to receive the first control signal, the drain of the second N-type metal oxide semiconductor transistor 1331 is connected to the fourth end of the inductor module 1012, and the source of the second N-type metal oxide semiconductor transistor 1331 is grounded.

[0104] Optionally, the second N-type metal oxide semiconductor transistor 1331 is turned on or off under the action of the first control signal. When the first control signal is at a low level, the second N-type metal oxide semiconductor transistor 1331 is turned off or cut off. Conversely, when the first control signal is at a high level, the second N-type metal oxide semiconductor transistor 1331 is turned on.

[0105] For a possible implementation, see Figure 4 The inductor module 1012 in the DC-AC converter 101 provided in the embodiment of the present application includes: a first inductor 121 and a second inductor 122 .

[0106] One end of the first inductor 121 is connected to the drain of the first P-type metal oxide semiconductor transistor 1121 and the drain of the first power transistor 1111, respectively, and the other end of the first inductor 121 is connected to the drain of the first N-type metal oxide semiconductor transistor 1321 and the drain of the third power transistor 1311, respectively;

[0107] One end of the second inductor 122 is connected to the drain of the second P-type metal oxide semiconductor transistor 1131 and the drain of the second power transistor 1112 , and the other end of the second inductor 122 is connected to the drain of the second N-type metal oxide semiconductor transistor 1331 and the drain of the fourth power transistor 1312 .

[0108] It is worth noting that the parasitic capacitance of the power tube is much smaller than the parasitic capacitance of the P-type metal oxide semiconductor transistor and the parasitic capacitance of the N-type metal oxide semiconductor transistor. The resonance between the inductor in the inductor module 1012 and the parasitic capacitance of the power tube can be ignored. The inductor in the inductor module 1012 mainly resonates with the parasitic capacitance of the P-type metal oxide semiconductor transistor and the parasitic capacitance of the N-type metal oxide semiconductor transistor.

[0109] If the first control signal connected to the gate of the first P-type metal oxide semiconductor transistor 1121 and the gate of the second N-type metal oxide semiconductor transistor 1331 is at a low level, the second inductor 122 and the parasitic capacitance of the second P-type metal oxide semiconductor transistor 1131, the parasitic capacitance of the second power tube 1112, the parasitic capacitance of the second N-type metal oxide semiconductor transistor 1331 and the parasitic capacitance of the fourth power tube 1312 form a first resonant cavity.

[0110] Optionally, when the first control signal connected to the gate of the first P-type metal oxide semiconductor transistor 1121 and the gate of the second N-type metal oxide semiconductor transistor 1331 is at a low level, the first P-type metal oxide semiconductor transistor 1121 is turned on, the first N-type metal oxide semiconductor transistor 1321 is turned on, and the first inductor 121 is charged. At this time, the second inductor 122 resonates with the parasitic capacitance of the second P-type metal oxide semiconductor transistor 1131, the parasitic capacitance of the second power tube 1112, the parasitic capacitance of the second N-type metal oxide semiconductor transistor 1331, and the parasitic capacitance of the fourth power tube 1312 to form a first resonant cavity.

[0111] If the first control signal connected to the gate of the first P-type metal oxide semiconductor transistor 1121 and the gate of the second N-type metal oxide semiconductor transistor 1331 is at a high level, the first inductor 121 and the parasitic capacitance of the first P-type metal oxide semiconductor transistor 1121, the parasitic capacitance of the first power tube 1111, the parasitic capacitance of the first N-type metal oxide semiconductor transistor 1321 and the parasitic capacitance of the third power tube 1311 form a second resonant cavity.

[0112] Optionally, when the first control signal connected to the gate of the first P-type metal oxide semiconductor transistor 1121 and the gate of the second N-type metal oxide semiconductor transistor 1331 is at a high level, the second P-type metal oxide semiconductor transistor 1131 is turned on, the second N-type metal oxide semiconductor transistor 1331 is turned on, and the second inductor 122 is charged. At this time, the first inductor 121 resonates with the parasitic capacitance of the first P-type metal oxide semiconductor transistor 1121, the parasitic capacitance of the first power tube 1111, the parasitic capacitance of the first N-type metal oxide semiconductor transistor 1321, and the parasitic capacitance of the third power tube 1311 to form a second resonant cavity.

[0113] For a possible implementation, see Figure 5 The DC-AC converter 101 provided in the embodiment of the present application further includes: a first capacitor 1014 , a second capacitor 1015 , a third capacitor 1016 and a fourth capacitor 1017 .

[0114] Among them, the capacitance of the first capacitor 1014, the second capacitor 1015, the third capacitor 1016 and the fourth capacitor 1017 is much larger than the parasitic capacitance of the power tube, the parasitic capacitance of the P-type metal oxide semiconductor transistor and the parasitic capacitance of the N-type metal oxide semiconductor transistor as an example, which is mainly used to reduce the problem of parasitic capacitance mismatch between the P-type metal oxide semiconductor transistor and the N-type metal oxide semiconductor transistor. At this time, the resonance between the inductor in the inductor module 1012 and the parasitic capacitance of the power tube, the parasitic capacitance of the P-type metal oxide semiconductor transistor and the parasitic capacitance of the N-type metal oxide semiconductor transistor can be ignored, and the inductor in the inductor module 1012 mainly resonates with the first capacitor 1014, the second capacitor 1015, the third capacitor 1016 and the fourth capacitor 1017.

[0115] It is worth noting that the capacitance of the resonant cavity is mainly contributed by the on-chip capacitance and the parasitic capacitance. The present application does not specifically limit the capacitance values ​​of the parasitic capacitance and the on-chip capacitance.

[0116] A first end of the inductor module 1012 is connected to one end of the first capacitor 1014, a second end of the inductor module 1012 is connected to one end of the second capacitor 1015, a third end of the inductor module 1012 is connected to one end of the third capacitor 1016, a fourth end of the inductor module 1012 is connected to one end of the fourth capacitor 1017, and the other end of the first capacitor 1014, the other end of the second capacitor 1015, the other end of the third capacitor 1016 and the other end of the fourth capacitor 1017 are all connected to the input end of the AC-DC converter via the isolation electromagnetic coil;

[0117] If the first control signal connected to the first control terminal of the first conversion module 1011 and the second control terminal of the second conversion module 1013 is at a low level, the inductor module 1012 forms a first resonant cavity with the first conversion module 1011, the second conversion module 1013, the second capacitor 1015 and the fourth capacitor 1017;

[0118] If the first control terminal of the first conversion module 1011 and the second control terminal of the second conversion module 1013 receive the first control signal at a high level, the inductor module 1012 and the first conversion module 1011 , the second conversion module 1013 , the first capacitor 1014 and the third capacitor 1016 form a second resonant cavity.

[0119] In an optional implementation, Figure 6 , Figure 7 , Figure 8 The three working states of the DC-AC converter provided in this application, wherein: Figure 6 It is the first working state of the DC-AC converter. Figure 7 It is the second working state of the DC-AC converter. Figure 8 This is the third working state of the DC-AC converter. Figure 6 In the first working state shown, the first control signal is high level 1, and the second control signal is low level 0. At this time, the first P-type metal oxide semiconductor transistor 1121, the first power tube 1111, the first N-type metal oxide semiconductor transistor 1321 and the third power tube 1311 are all turned off. In this state, the first inductor 121 recovers the charge from the capacitor of VN1 (CN1) to the capacitor of VP1 (CP1). At this time, VN1<VTHN、VP1> VDD-|VTHP|, the second power tube 1112 and the fourth power tube 1312 are turned off, the second P-type metal oxide semiconductor transistor 1131 and the second N-type metal oxide semiconductor transistor 1331 are turned on, and the second inductor 122 conducts current until the voltage of VN1 reaches 0V and the voltage value of VP1 reaches its peak value, the first control signal is modulated to a low level, the second control signal is modulated to a high level, and the DC-AC converter enters Figure 7 The second working state shown; Figure 7 In the second working state shown, the first P-type metal oxide semiconductor transistor 1121 and the first N-type metal oxide semiconductor transistor 1321 are turned on, the first inductor 121 is charged, the second P-type metal oxide semiconductor transistor 1131 and the second N-type metal oxide semiconductor transistor 1331 are turned off, and the second inductor 122 resonates with the capacitor VN2 (CN2) and the capacitor VP2 (CP2). In this state, the first P-type metal oxide semiconductor transistor 1121 and the first N-type metal oxide semiconductor transistor 1321 are turned off, the first P-type metal oxide semiconductor transistor 1121 and the first N-type metal oxide semiconductor transistor 1321 conduct the current of the first inductor 121, and when the voltage of VN2 and the voltage of VP2 exceed the corresponding VTH, the DC-AC converter enters Figure 8 The third working state shown; Figure 8 In the third working state shown, the first P-type metal oxide semiconductor transistor 1121 and the first N-type metal oxide semiconductor transistor 1321 are turned on, so that more current flows through the first inductor 121 until the resonant voltages of VN2 and VP2 fall back to their respective VTHs, and the third working state ends.

[0120] Fig. 9 For the working parameter curve diagram of the DC-AC converter provided in this application, see Fig. 9 The DC-AC converter provided in the embodiment of the present application mainly has six working states, namely: the first working state, the second working state, the third working state, the C1 working state, the C2 working state and the C3 working state. Among them, the S signal is used to represent the second control signal. Fig. 9 It can be seen that when VN1 is greater than 0V, VN2 drops to 0V, and the first resonant cavity in the AC-DC converter resonates; when VN2 is greater than 0V, VN1 drops to 0V, and the second resonant cavity in the AC-DC converter resonates. When the second control signal changes from a low level to a high level and then to a low level, the AC-DC converter sequentially enters the first working state from the C3 working state, then the second working state, then the third working state, then the C1 working state, and then the C2 working state, and so on.

[0121] Also, see Fig. 9 It can be seen that the resonance of the first resonant cavity and the resonance of the second resonant cavity are alternately cycled, and the first working state, the second working state and the third working state of the AC-DC converter are symmetrical with the circuit operation state structures of the C1 working state, the C2 working state and the C3 working state, and this application will not go into details.

[0122] Fig.10This is a schematic diagram of the conversion efficiency of a DC-DC converter provided in this application, see Fig.10 The DC-DC conversion device provided in the embodiment of the present application can achieve higher conversion efficiency in high-frequency working scenarios.

[0123] Fig.11 and Fig.12 See the electromagnetic interference test results diagram provided for this application. Fig.11 and Fig.12 The DC-DC conversion device provided in the embodiment of the present application can meet the Class-B standard restrictions of CISPR-32.

[0124] Fig.13 A schematic diagram of the structure of a DC-DC converter provided in this application, see Fig.13 The DC-DC converter 10 provided in the embodiment of the present application includes: the DC-AC converter 101, the isolation electromagnetic coil 102 and the AC-DC converter 103. The output end of the DC-AC converter 101 is connected to the input end of the AC-DC converter 103 via the isolation electromagnetic coil 102, and the output end of the AC-DC converter 103 is used to connect to an external load.

[0125] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0126] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A DC-AC converter, characterized in that: The DC-AC converter includes: a first conversion module, an inductor module and a second conversion module; The first end of the first conversion module is used to access the power supply voltage, the first control end of the first conversion module is used to access the first control signal, the second control end of the first conversion module is used to access the second control signal, the second end of the first conversion module is connected to the first end of the inductor module, the third end of the first conversion module is connected to the second end of the inductor module, and the second control signal is an inverted level signal of the first control signal; The third end of the inductor module is connected to the first end of the second conversion module, the fourth end of the inductor module is connected to the second end of the second conversion module, the first control end of the second conversion module is used to access the second control signal, the second control end of the second conversion module is used to access the first control signal, and the third end of the second conversion module is grounded; If the first control signal connected to the first control end of the first conversion module and the second control end of the second conversion module is at a low level, the inductor module forms a first resonant cavity with the first conversion module and the second conversion module, so that the DC-AC converter realizes charge recovery through the first resonant cavity; If the first control signal connected to the first control end of the first conversion module and the second control end of the second conversion module is at a high level, the inductor module forms a second resonant cavity with the first conversion module and the second conversion module, so that the DC-AC converter realizes charge recovery through the second resonant cavity.

2. The DC-AC converter according to claim 1, characterized in that: The first conversion module includes: a first power amplifier unit, a first driving unit and a second driving unit; The first end of the first power amplifier unit is used to access the power supply voltage, and one end of the first driving unit and one end of the second driving unit are both connected to the first end of the first power amplifier unit; The control end of the first driving unit is used to access the first control signal, the control end of the second driving unit is used to access the second control signal, the other end of the first driving unit and the second end of the first power amplifier unit are both connected to the first end of the inductor module, and the other end of the second driving unit and the third end of the first power amplifier unit are both connected to the second end of the inductor module.

3. The DC-AC converter according to claim 2, characterized in that: The first power amplifier unit includes: a first power tube and a second power tube; The source of the first power tube and the source of the second power tube are both used to access the power supply voltage, the gate of the first power tube is connected to the drain of the second power tube, the drain of the first power tube is connected to the gate of the second power tube, the drain of the first power tube is also connected to the first end of the inductor module, and the drain of the second power tube is also connected to the second end of the inductor module.

4. The DC-AC converter according to claim 2, characterized in that: The first driving unit includes: a first P-type metal oxide semiconductor transistor, and the second driving unit includes: a second P-type metal oxide semiconductor transistor; The gate of the first P-type metal oxide semiconductor transistor is used to access the first control signal, the source of the first P-type metal oxide semiconductor transistor is connected to the source of the first power tube, and the drain of the first P-type metal oxide semiconductor transistor is respectively connected to the drain of the first power tube and the first end of the inductor module; The gate of the second P-type metal oxide semiconductor transistor is used to access the second control signal, the source of the second P-type metal oxide semiconductor transistor is connected to the source of the second power tube, and the drain of the second P-type metal oxide semiconductor transistor is respectively connected to the drain of the second power tube and the second end of the inductor module.

5. The DC-AC converter according to claim 1, characterized in that: The second conversion module includes: a second power amplifier unit, a third driving unit and a fourth driving unit; A first end of the second power amplifier unit and one end of the third driving unit are both connected to the third end of the inductor module, one end of the fourth driving unit and the second end of the second power amplifier unit are both connected to the fourth end of the inductor module, a control end of the third driving unit is used to access the second control signal, a control end of the fourth driving unit is used to access the first control signal, and a third end of the second power amplifier unit, another end of the third driving unit and another end of the fourth driving unit are all grounded.

6. The DC-AC converter according to claim 5, characterized in that: The second power amplifier unit includes: a third power tube and a fourth power tube; The drain of the third power tube is connected to the third end of the inductor module, the drain of the fourth power tube is connected to the fourth end of the inductor module, the gate of the third power tube is connected to the drain of the fourth power tube, the drain of the third power tube is also connected to the gate of the fourth power tube, and the source of the third power tube and the source of the fourth power tube are both grounded.

7. The DC-AC converter according to claim 5, characterized in that: The third driving unit includes: a first N-type metal oxide semiconductor transistor, and the fourth driving unit includes: a second N-type metal oxide semiconductor transistor; The gate of the first N-type metal oxide semiconductor transistor is used to receive the second control signal, the drain of the first N-type metal oxide semiconductor transistor is connected to the third end of the inductor module, and the source of the first N-type metal oxide semiconductor transistor is grounded; The gate of the second N-type metal oxide semiconductor transistor is used to access the first control signal, the drain of the second N-type metal oxide semiconductor transistor is connected to the fourth end of the inductor module, and the source of the second N-type metal oxide semiconductor transistor is grounded.

8. The DC-AC converter according to any one of claims 1 to 7, characterized in that: The inductor module comprises: a first inductor and a second inductor; One end of the first inductor is respectively connected to the drain of the first P-type metal oxide semiconductor transistor and the drain of the first power tube, and the other end of the first inductor is respectively connected to the drain of the first N-type metal oxide semiconductor transistor and the drain of the third power tube; One end of the second inductor is respectively connected to the drain of the second P-type metal oxide semiconductor transistor and the drain of the second power tube, and the other end of the second inductor is respectively connected to the drain of the second N-type metal oxide semiconductor transistor and the drain of the fourth power tube; If the first control signal connected to the gate of the first P-type metal oxide semiconductor transistor and the gate of the second N-type metal oxide semiconductor transistor is at a low level, the second inductor and the parasitic capacitance of the second P-type metal oxide semiconductor transistor, the parasitic capacitance of the second power tube, the parasitic capacitance of the second N-type metal oxide semiconductor transistor and the parasitic capacitance of the fourth power tube form the first resonant cavity; If the first control signal connected to the gate of the first P-type metal oxide semiconductor transistor and the gate of the second N-type metal oxide semiconductor transistor is at a high level, the first inductor and the parasitic capacitance of the first P-type metal oxide semiconductor transistor, the parasitic capacitance of the first power tube, the parasitic capacitance of the first N-type metal oxide semiconductor transistor and the parasitic capacitance of the third power tube form the second resonant cavity.

9. The DC-AC converter according to claim 1, characterized in that: The DC-AC converter further includes: a first capacitor, a second capacitor, a third capacitor and a fourth capacitor; The first end of the inductor module is connected to one end of the first capacitor, the second end of the inductor module is connected to one end of the second capacitor, the third end of the inductor module is connected to one end of the third capacitor, the fourth end of the inductor module is connected to one end of the fourth capacitor, and the other end of the first capacitor, the other end of the second capacitor, the other end of the third capacitor and the other end of the fourth capacitor are all grounded; If the first control signal connected to the first control end of the first conversion module and the second control end of the second conversion module is at a low level, the inductor module, the first conversion module, the second conversion module, the second capacitor and the fourth capacitor form the first resonant cavity; If the first control signal connected to the first control end of the first conversion module and the second control end of the second conversion module is at a high level, the inductor module and the first conversion module, the second conversion module, the first capacitor and the third capacitor form the second resonant cavity.

10. A DC-DC conversion device, characterized in that: The DC-DC conversion device comprises: the DC-AC converter, the isolation electromagnetic coil and the AC-DC converter according to any one of claims 1 to 9; The output end of the DC-AC converter is connected to the input end of the AC-DC converter via the isolation electromagnetic coil, and the output end of the AC-DC converter is used to connect to an external load.

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