A unipolar input dc transformer

Abstract

The application relates to a unipolar input direct-current transformer which comprises a direct-current power supply, a boost inductor module, a switch module, a resonance module, a transformer module, a rectifier module and an output filter module. The positive pole of the direct-current power supply is connected with one end of the boost inductor module, the negative pole of the direct-current power supply is grounded, the other end of the boost inductor module is connected with one end of the switch module, the other end of the switch module is connected with the negative pole of the direct-current power supply, one end of the resonance module is connected with one end of the boost inductor module, the other end of the resonance module is connected with the input end of the transformer module, the output end of the transformer module is connected with the input end of the rectifier module, the output end of the rectifier module is connected with the input end of the output filter module, and the output end of the filter module is connected with a load. The proposed modular direct-current transformer has continuous input inductor current, the design difficulty of an input filter is reduced, semiconductor devices can realize soft switching, and the system efficiency and power density are improved.

Description

Technical Field

[0001] This invention relates to the field of transformers, and more particularly to a unipolar input DC transformer. Background Technology

[0002] With the increasing penetration of renewable energy, medium-voltage DC technology is a solution to supplement and enhance existing AC power grids. Modular multilevel DC converters, due to their superior flexibility, scalability, and reliability, have become an optional topology for connecting different DC systems.

[0003] Existing technologies propose transformer-coupled face-to-face topologies for high buck-ratio conversion applications, but these suffer from low power density and high power loss. For low buck-ratio conversion applications, transformerless direct-connect structures are proposed, but these incur high current stress and require expensive filters. Existing technologies also propose resonant modular multilevel DC transformers based on transformer coupling, which achieve soft switching of sub-modules through resonance between the sub-modules and the resonant inductor. However, the resonant frequency changes with the switching of operating modes and is directly related to the number of operating sub-modules, thus hindering system design. Furthermore, this topology requires expensive filter design. Existing technologies propose a wide-output-range modular multilevel DC transformer by adding auxiliary circuitry, but this increases system cost. Existing technologies also propose half-bridge modular DC transformers, but these cannot achieve soft switching of all switching transistors. Summary of the Invention

[0004] This invention provides a unipolar input DC transformer, which aims to solve the problems of low power density, resonant frequency being directly related to the number of sub-modules, expensive filters, and inability to achieve soft switching of all switching transistors in existing solutions.

[0005] This invention provides a unipolar input DC transformer, including a DC power supply V. in The DC power supply V comprises a boost inductor module, a switching module, a resonant module, a transformer module, a rectifier module, and an output filter module. in The positive terminal is connected to one end of the boost inductor module, and the DC power supply V in The negative terminal is grounded, and the other end of the boost inductor module is connected to one end of the switching module, while the other end of the switching module is connected to the DC power supply V. in The negative terminal of the resonant module is connected, one end of the resonant module is connected to one end of the boost inductor module, the other end of the resonant module is connected to the input terminal of the transformer module, the output terminal of the transformer module is connected to the input terminal of the rectifier module, the output terminal of the rectifier module is connected to the input terminal of the output filter module, and the output terminal of the filter module is connected to the load.

[0006] As a further improvement of the present invention, the boost inductor module includes a boost inductor L. U The resonant module includes a capacitor C. r and inductor L r The transformer module includes transformer T r and excitation inductance L m The rectifier module includes field-effect transistors SR1 and SR2, and the output filter module includes capacitor C. 011 and capacitor C 012 The DC power supply V in The positive terminal of the boost inductor L U One end is connected to the DC power supply V. in The negative terminal of the boost inductor L is grounded. U The other end is connected to one end of the switch module, and the other end of the switch module is connected to the DC power supply V. in The negative terminal of the boost inductor L is connected. U The other end is connected to capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to transformer T r One end of the primary winding is connected to the transformer T. r The other end of the primary winding is connected to the DC power supply V. in The negative terminal is connected, and the excitation inductor L m Located at the transformer T r Within the primary winding of the transformer T r One end of the secondary winding is connected to the source of the field-effect transistor SR1, and the drain of the field-effect transistor SR1 is connected to the capacitor C. 011 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the capacitor C 012 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the transformer T r The other end of the secondary winding is connected to the capacitor C. 012 The other end is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The capacitor C 011 One end is connected to the load R Ld One end is connected, the load R Ld The other end is connected to the capacitor C 012 The other end is connected.

[0007] As a further improvement of the present invention, the boost inductor module includes a boost inductor L. UThe resonant module includes a capacitor C. r and inductor L r The transformer module includes a magnetizing inductor L. m The rectifier module includes field-effect transistors SR1 and SR2, and the output filter module includes capacitor C. 011 and capacitor C 012 The DC power supply V in The positive terminal of the boost inductor L U One end is connected to the DC power supply V. in The negative terminal of the boost inductor L is grounded. U The other end is connected to one end of the switch module, and the other end of the switch module is connected to the DC power supply V. in The negative terminal of the boost inductor L is connected. U The other end is connected to capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the magnetizing inductor L m One end is connected to the excitation inductor L m One end of the magnetizing inductor L is connected to the source of the field-effect transistor SR1. m The other end is connected to the DC power supply V in The negative terminal of the field-effect transistor SR1 is connected to the capacitor C. 011 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the capacitor C 012 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the excitation inductor L m The other end is connected to the capacitor C. 012 The other end is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The capacitor C 011 One end is connected to the load R Ld One end is connected, the load R Ld The other end is connected to the capacitor C 012 The other end is connected; the boost inductor module includes a boost inductor L U The resonant module includes a capacitor C. r and inductor L r The rectifier module includes field-effect transistors SR1 and SR2, and the output filter module includes capacitor C. 011 and capacitor C 012 The DC power supply V in The positive terminal of the boost inductor L UOne end is connected to the DC power supply V. in The negative terminal of the boost inductor L is grounded. U The other end is connected to one end of the switch module, and the other end of the switch module is connected to the DC power supply V. in The negative terminal of the boost inductor L is connected. U The other end is connected to capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the source of the field-effect transistor SR1, and the drain of the field-effect transistor SR1 is connected to the capacitor C. 011 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the capacitor C 012 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the DC power supply V in The negative terminal of the capacitor C 012 The other end is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The capacitor C 011 One end is connected to the load R Ld One end is connected, the load R Ld The other end is connected to the capacitor C 012 The other end is connected.

[0008] As a further improvement of the present invention, the boost inductor module includes a boost inductor L. U The resonant module includes a capacitor C. r and inductor L r The rectifier module includes field-effect transistors SR1 and SR2, the output filter module includes capacitor C0, and the DC power supply V... in The negative terminal of the boost inductor L U One end is connected to the DC power supply V. in The negative terminal of the boost inductor L is grounded. U The other end is connected to one end of the switch module, and the other end of the switch module is connected to the DC power supply V. in The positive terminal of the switch module is connected to the positive terminal of the MOSFET SR1. The other end of the switch module is connected to one end of capacitor C0. The other end of capacitor C0 is connected to the drain of MOSFET SR1. One end of capacitor C0 is connected to the source of MOSFET SR2. The drain of MOSFET SR2 is connected to the source of MOSFET SR1. The source of MOSFET SR1 is connected to capacitor C1. r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the inductor L rOne end is connected, the inductor L r The other end is connected to the boost inductor L U The other end is connected, and the drain of the field-effect transistor SR1 is connected to the load R. Ld One end is connected, the load R Ld The other end is grounded.

[0009] As a further improvement of the present invention, the boost inductor module includes a boost inductor L. U The resonant module includes a capacitor C. r and inductor L r The transformer module includes a magnetizing inductor L. m The rectifier module includes field-effect transistors SR1 and SR2 and capacitor C. b The output filter module includes a capacitor C0, and the DC power supply V... in The negative terminal of the boost inductor L U One end is connected to the DC power supply V. in The negative terminal of the boost inductor L is grounded. U The other end is connected to one end of the switch module, and the other end of the switch module is connected to the DC power supply V. in The positive terminal of the switch module is connected to the positive terminal of the capacitor C0. The other end of the capacitor C0 is connected to the drain of the field-effect transistor SR1. One end of the capacitor C0 is connected to the source of the field-effect transistor SR2. The drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The source of the field-effect transistor SR1 is connected to the positive terminal of the capacitor C0. b One end of the capacitor C is connected to the capacitor C. b The other end is connected to the capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the boost inductor L U The other end is connected to the excitation inductor L m One end is connected to the capacitor C r One end is connected to the excitation inductor L m The other end is connected to one end of the capacitor C0, and the drain of the field-effect transistor SR1 is connected to the load R. Ld One end is connected, the load R Ld The other end is grounded.

[0010] As a further improvement of the present invention, the boost inductor module includes a boost inductor L. U The resonant module includes a capacitor C. ULr Inductor L ULrCapacitor C r and inductor L r The transformer module includes transformer T UL and excitation inductance L ULm The rectifier module includes field-effect transistors SR1, SR2, SR5, and SR6, and the output filter module includes capacitor C. 02 Capacitor C 011 and capacitor C 012 The load includes load R Ld1 and load R Ld2 The DC power supply V in The negative terminal of the boost inductor L U One end is connected to the DC power supply V. in The negative terminal of the boost inductor L is grounded. U The other end is connected to one end of the switch module, and the other end of the switch module is connected to the DC power supply V. in The positive terminal of the switch module is connected to the capacitor C. 02 One end is connected, the capacitor C 02 The other end is connected to the drain of the field-effect transistor SR5, and the capacitor C 02 One end of the capacitor is connected to the source of the field-effect transistor SR6, the drain of the field-effect transistor SR6 is connected to the source of the field-effect transistor SR5, and the source of the field-effect transistor SR5 is connected to the capacitor C. r One end is connected, and the drain of the field-effect transistor SR5 is connected to the load R. Ld2 One end is connected, the load R Ld2 The other end of the capacitor C is grounded. r The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the boost inductor L U The other end is connected to the capacitor C. 02 One end is connected to the capacitor C ULr One end is connected, the C ULr The other end is connected to the inductor L ULr One end is connected, the inductor L ULr The other end is connected to the transformer T UL One end of the primary winding is connected to the transformer T. UL The other end of the primary winding is connected to the boost inductor L U The other end is connected to the excitation inductor L ULm Located at the transformer T UL Within the primary winding of the transformer T ULOne end of the secondary winding is connected to the source of the field-effect transistor SR1, and the drain of the field-effect transistor SR1 is connected to the capacitor C. 011 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the capacitor C 012 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the transformer T UL The other end of the secondary winding is connected to the capacitor C. 012 The other end is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The capacitor C 011 One end is connected to the load R Ld One end is connected, the load R Ld The other end is connected to the capacitor C 012 The other end is connected.

[0011] As a further improvement of the present invention, the boost inductor module includes a boost inductor L. L1 and boost inductor L R1 The resonant module includes a capacitor C. r and inductor L r The transformer module includes transformer T r and inductor L m The rectifier module includes field-effect transistors SR1, SR2, SR3, and SR4; the output filter module includes capacitor C0; and there are two switching modules, namely a first switching module and a second switching module. The DC power supply V... in The positive terminal of the boost inductor L L1 One end is connected to the DC power supply V. in The negative terminal of the boost inductor L is grounded. L1 The other end is connected to one end of the first switch module, and the other end of the first switch module is connected to the DC power supply V. in The negative terminal of the boost inductor L is connected. L1 The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to transformer T r One end of the primary winding is connected to the transformer T. r The other end of the primary winding is connected to one end of the second switching module, and the other end of the second switching module is connected to the DC power supply V. in The negative terminal is connected, and the excitation inductor L ULm Assuming the transformer T ULWithin the primary winding, the boost inductor L R1 One end is connected to the boost inductor L L1 One end is connected to the boost inductor L R1 The other end is connected to one end of the second switch module, and the transformer T r One end of the secondary winding of the transformer is connected to the source of the field-effect transistor SR1. The drain of the field-effect transistor SR1 is connected to the drain of the field-effect transistor SR3. The source of the field-effect transistor SR3 is connected to the drain of the field-effect transistor SR4. The source of the field-effect transistor SR4 is connected to the source of the field-effect transistor SR2. The drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. r The other end of the secondary winding is connected to the drain of the field-effect transistor SR4. The drain of the field-effect transistor SR3 is connected to one end of the capacitor C0. The other end of the capacitor C0 is connected to the source of the field-effect transistor SR4. One end of the capacitor C0 is connected to the load R. Ld One end is connected, the load R Ld The other end is connected to the other end of the capacitor C0.

[0012] As a further improvement of the present invention, the boost inductor module includes a boost inductor L. U1 and boost inductor L R1 The resonant module includes a capacitor C. r Inductor L r Capacitor C Lr Capacitor C Rr Inductor L Lr and inductor L Rr The transformer module includes transformer T r Transformer T L Transformer T R Magnetizing inductance L m Magnetizing inductance L Lm and excitation inductance L Rm The rectifier module includes field-effect transistors SR1, SR2, SR3, SR4, and SR5. R1 SR Field-Effect Transistor R2 SR Field-Effect Transistor L1 and field-effect transistor SR L2 The output filter module includes capacitor C0 and capacitor C. 011 Capacitor C 012 Capacitor C 021 and capacitor C 022 The switch module comprises two modules, namely a first switch module and a second switch module, and the load includes load R. Ld Load R Ld_L and load RLd_R The DC power supply V in The positive terminal of the boost inductor L U1 One end is connected to the boost inductor L U1 The other end is connected to one end of the first switch module, and the other end of the first switch module is connected to the DC power supply V. in The negative terminal of the boost inductor L is connected. U1 The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to transformer T r One end of the primary winding is connected to the transformer T. r The other end of the primary winding is connected to one end of the second switching module, and the other end of the second switching module is connected to the DC power supply V. in The negative terminal is connected, and the excitation inductor L m Assuming the transformer T r In the primary winding, the inductor L r One end is connected to the inductor L Lr One end is connected, the inductor L Lr The other end is connected to the capacitor C Lr One end of the capacitor C is connected to the capacitor C. Lr The other end is connected to the transformer T L One end of the primary winding of the transformer T is connected. L The other end of the primary winding is grounded, and the excitation inductor L Lm Assuming the transformer T L In the primary winding, the inductor L Rr One end of the inductor L is connected to one end of the second switch module. Rr The other end is connected to the capacitor C Rr One end of the capacitor C is connected to the capacitor C. Rr The other end is connected to the transformer T R One end of the primary winding of the transformer T is connected. R The other end of the primary winding is grounded, and the excitation inductor L Rm Assuming the transformer T R Within the primary winding, the boost inductor L R1 One end is connected to the boost inductor L L1 One end is connected to the boost inductor L R1 The other end is connected to one end of the second switch module, and the transformer T rOne end of the secondary winding is connected to the source of the field-effect transistor SR1, the drain of the field-effect transistor SR1 is connected to the drain of the field-effect transistor SR3, the source of the field-effect transistor SR3 is connected to the drain of the field-effect transistor SR4, the source of the field-effect transistor SR4 is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The transformer T... r The other end of the secondary winding is connected to the drain of the field-effect transistor SR4. The drain of the field-effect transistor SR3 is connected to one end of the capacitor C0. The other end of the capacitor C0 is connected to the source of the field-effect transistor SR4. One end of the capacitor C0 is connected to the load R. Ld One end is connected, the load R Ld The other end is connected to the other end of the capacitor C0, and the transformer T L One end of the secondary winding is connected to the field-effect transistor SR L1 The source connection of the field-effect transistor SR L1 The drain of the capacitor C 021 One end of the capacitor C is connected to the capacitor C. 021 The other end is connected to the capacitor C 022 One end of the capacitor C is connected to the capacitor C. 021 The other end is connected to the transformer T L The other end of the secondary winding is connected to the capacitor C. 022 The other end is connected to the field-effect transistor SR L2 The source connection of the field-effect transistor SR L2 The drain of the field-effect transistor SR L1 The source connection, the capacitor C 021 One end is connected to the load R Ld_L One end is connected, the load R Ld_L The other end is connected to the capacitor C 022 The other end is connected to the transformer T R One end of the secondary winding is connected to the field-effect transistor SR R1 The source connection of the field-effect transistor SR R1 The drain of the capacitor C 011 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the capacitor C 012 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the transformer T R The other end of the secondary winding is connected to the capacitor C. 021 The other end is connected to the field-effect transistor SR R2 The source connection of the field-effect transistor SR R2 The drain of the field-effect transistor SR R1The source connection, the capacitor C 011 One end is connected to the load R Ld_R One end is connected, the load R Ld_R The other end is connected to the capacitor C 012 The other end is connected.

[0013] As a further improvement of the present invention, the boost inductor module includes a boost inductor L. L1 and boost inductor L R1 The resonant module includes a capacitor C. r Inductor L r Capacitor C Lr Capacitor C Rr Inductor L Lr and inductor L Rr The transformer module includes transformer T r and excitation inductance L m The rectifier module includes field-effect transistors SR1, SR2, SR3, SR4, SR5, SR6, SR7, and SR8. The output filter module includes capacitor C. 01 Capacitor C 02 and capacitor C 03 The switch module comprises two modules, namely a first switch module and a second switch module, and the load includes load R. Ld1 The DC power supply V in The positive terminal is connected to one end of the first switching module, and the other end of the first switching module is connected to the boost inductor L. L1 One end is connected to the boost inductor L L1 The other end is connected to the DC power supply V in The negative terminal of the capacitor C is connected. 02 One end of the capacitor C is connected to one end of the first switch module. 02 The other end is connected to the drain of the field-effect transistor SR5, the source of the field-effect transistor SR5 is connected to the drain of the field-effect transistor SR6, and the source of the field-effect transistor SR6 is connected to the capacitor C. 02 One end of the capacitor C is connected to the capacitor C. Lr One end of the capacitor is connected to the source of the field-effect transistor SR5, and the capacitor C Lr The other end is connected to the inductor L Lr One end is connected, the inductor L Lr The other end is connected to the boost inductor L L1 One end is connected, the inductor L r One end is connected to the boost inductor L L1 One end is connected, the inductor L rThe other end is connected to the capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the transformer T r One end of the primary winding of the transformer T is connected. r The other end of the primary winding is connected to the boost inductor L R1 One end is connected to the excitation inductor L m Located at the transformer T r Within the primary winding, the boost inductor L R1 The other end is connected to the DC power supply V in The negative terminal of the boost inductor L is connected. R1 One end of the second switch module is connected to one end of the second switch module, and the other end of the second switch module is connected to capacitor C. 03 One end of the capacitor C is connected to the capacitor C. 03 The other end is connected to the drain of the field-effect transistor SR7, the drain of the field-effect transistor SR7 is connected to the drain of the field-effect transistor SR5, the source of the field-effect transistor SR7 is connected to the drain of the field-effect transistor SR8, and the source of the field-effect transistor SR8 is connected to the capacitor C. 03 One end is connected, and the drain of the field-effect transistor SR8 is connected to the capacitor C. Rr One end of the capacitor C is connected to the capacitor C. Rr The other end is connected to the inductor L Rr One end is connected, the inductor L Rr The other end is connected to the boost inductor L R1 One end is connected to the transformer T. r One end of the secondary winding is connected to the source of the field-effect transistor SR1, the drain of the field-effect transistor SR1 is connected to the drain of the field-effect transistor SR3, the source of the field-effect transistor SR3 is connected to the drain of the field-effect transistor SR4, the source of the field-effect transistor SR4 is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The transformer T... r The other end of the secondary winding is connected to the drain of the field-effect transistor SR4, and the drain of the field-effect transistor SR3 is connected to the capacitor C. 01 One end of the capacitor C is connected to the capacitor C. 01 The other end is connected to the source of the field-effect transistor SR4, and the capacitor C 01 One end is connected to the load R Ld1 One end is connected, the load R Ld1 The other end is connected to the capacitor C 01 The other end is connected to the capacitor C. 03 The other end is connected to the boost inductor L R1 The other end serves as the high-voltage output.

[0014] As a further improvement of the present invention, the switching module is composed of several switching circuits SM connected in series. Each switching circuit SM employs a first half-bridge switch and / or a second half-bridge switch, and / or a full-bridge switch. The first half-bridge switch includes a field-effect transistor Q1, a field-effect transistor Q2, and a capacitor C1. The drain of the field-effect transistor Q1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the source of the field-effect transistor Q2. The drain of the field-effect transistor Q2 is connected to the source of the field-effect transistor Q1. The source and drain of the field-effect transistor Q2 are outputs. The second half-bridge switch includes a field-effect transistor Q1... 11 MOSFET Q 21 and capacitor C2, the field-effect transistor Q 11 The drain of the capacitor is connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to the field-effect transistor Q. 21 The source connection of the field-effect transistor Q 21 The drain of the field-effect transistor Q 11 The source connection of the field-effect transistor Q 11 The source and drain outputs; the full-bridge switch includes a field-effect transistor Q. 12 MOSFET Q 22 Field-effect transistors Q3 and Q4, and capacitor C3, wherein the field-effect transistor Q... 12 The drain of the transistor is connected to the drain of the field-effect transistor Q3. 12 The source of the field-effect transistor Q 22 The drain connection of the field-effect transistor Q 22 The source of capacitor C3 is connected to the source of transistor Q4, the source of transistor Q3 is connected to the drain of transistor Q4, and one end of capacitor C3 is connected to the drain of transistor Q4. 12 The drain of capacitor C3 is connected to the drain of transistor Q. The other end of capacitor C3 is connected to the field-effect transistor Q. 22 The source connection of the field-effect transistor Q 12 The source of the transistor is the same as the source output of the field-effect transistor Q3.

[0015] The beneficial effects of this invention are: the proposed modular DC transformer has a continuous input inductor current, which reduces the design difficulty of the input filter; all semiconductor devices have achieved soft switching, which improves system efficiency and power density; in addition, when the converter is designed to operate in resonant mode, the resonant frequency is independent of the number of operating sub-modules, which facilitates system design. Attached Figure Description

[0016] Figure 1 A first implementation circuit of a modular DC transformer is shown;

[0017] Figure 2The first implementation circuit is shown where the transformer is replaced by an inductor;

[0018] Figure 3 The first implementation circuit with the transformer removed is shown;

[0019] Figure 4 A second implementation circuit with the transformer removed is shown;

[0020] Figure 5 A second implementation circuit is shown where the transformer is replaced by an inductor;

[0021] Figure 6 An implementation circuit with non-isolated high-voltage output and isolated low-voltage output is shown;

[0022] Figure 7 A second implementation circuit of the modular DC transformer is shown;

[0023] Figure 8 An implementation circuit with three isolated outputs is shown;

[0024] Figure 9 An implementation circuit with a non-isolated boost output and an isolated output is shown;

[0025] Figure 10 The circuit diagram of the first half-bridge switch is shown;

[0026] Figure 11 The circuit diagram of the second half-bridge switch is shown;

[0027] Figure 12 The circuit diagram of the full-bridge switch is shown;

[0028] Figure 13 The implementation circuits of the primary and secondary resonant cavities of the transformer are shown;

[0029] Figure 14 The implementation circuit of the transformer secondary side and the rectifier is shown;

[0030] Figure 15 The implementation circuit of the modular DC transformer using an input series and output parallel architecture is shown. Detailed Implementation

[0031] Figure reference numerals: 100 - Modular DC transformer, 101 - DC power supply V in 102-Boost inductor module, 103-Switch module, 104-Resonant module, 105-Transformer module, 106-Rectifier module, 107-Output filter module, 108-Load.

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0033] The DC transformer solution provided by this invention modularizes each component, allowing for various topological changes within a single modular circuit to suit different circuit conditions and reduce the need for input filter design. Furthermore, the proposed DC transformer enables soft switching of all transistors, improving system efficiency and power density. When the converter operates in resonant mode, the resonant frequency is independent of the number of operating submodules, facilitating system design.

[0034] This invention provides a unipolar input DC transformer, including a DC power supply V. in 101. Boost inductor module 102, switch module 102, resonant module 104, transformer module 105, rectifier module 106, and output filter module 107, wherein the DC power supply V in The positive terminal of 101 is connected to one end of the boost inductor module 102, and the DC power supply V in The negative terminal of 101 is grounded, and the other end of the boost inductor module 102 is connected to one end of the switch module 102. The other end of the switch module 102 is connected to the DC power supply V. in The negative terminal of 101 is connected, one end of the resonant module 104 is connected to one end of the boost inductor module 102, the other end of the resonant module 104 is connected to the input terminal of the transformer module 105, the output terminal of the transformer module 105 is connected to the input terminal of the rectifier module 106, the output terminal of the rectifier module 106 is connected to the input terminal of the output filter module 107, and the output terminal of the filter module is connected to the load 108.

[0035] Figure 1 The basic circuit configuration of the present invention is shown, wherein the boost inductor module 102 includes a boost inductor L. U The resonant module 104 includes a capacitor C. r and inductor L r The transformer module 105 includes a transformer T r and excitation inductance L m The rectifier module 106 includes field-effect transistors SR1 and SR2, and the output filter module 107 includes capacitor C. 011 and capacitor C 012 The DC power supply V in The positive terminal of 101 is connected to the boost inductor L. U One end is connected to the DC power supply V. in The negative terminal of 101 is grounded, and the boost inductor LU The other end is connected to one end of the switch module 103, and the other end of the switch module 103 is connected to the DC power supply V. in The negative terminal of 101 is connected, and the boost inductor L U The other end is connected to capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to transformer T r One end of the primary winding is connected to the transformer T. r The other end of the primary winding is connected to the DC power supply V. in The negative terminal of 101 is connected, and the magnetizing inductor L m Located at the transformer T r Within the primary winding of the transformer T r One end of the secondary winding is connected to the source of the field-effect transistor SR1, and the drain of the field-effect transistor SR1 is connected to the capacitor C. 011 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the capacitor C 012 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the transformer T r The other end of the secondary winding is connected to the capacitor C. 012 The other end is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The capacitor C 011 One end is connected to the load R Ld One end is connected, the load R Ld The other end is connected to the capacitor C 012 The other end is connected.

[0036] Figure 2 and Figure 3 Two embodiments are shown in which the transformer is replaced with an inductor. Figure 2 The boost inductor module 102 described herein includes a boost inductor L U The resonant module 104 includes a capacitor C. r and inductor L r The transformer module 105 includes a magnetizing inductor L. m The rectifier module 106 includes field-effect transistors SR1 and SR2, and the output filter module 107 includes capacitor C. 011 and capacitor C 012 The DC power supply V in The positive terminal of 101 is connected to the boost inductor L. U One end is connected to the DC power supply V. inThe negative terminal of 101 is grounded, and the boost inductor L U The other end is connected to one end of the switch module 103, and the other end of the switch module 103 is connected to the DC power supply V. in The negative terminal of 101 is connected, and the boost inductor L U The other end is connected to capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the magnetizing inductor L m One end is connected to the excitation inductor L m One end of the magnetizing inductor L is connected to the source of the field-effect transistor SR1. m The other end is connected to the DC power supply V in The negative terminal of 101 is connected, and the drain of the field-effect transistor SR1 is connected to the capacitor C. 011 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the capacitor C 012 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the excitation inductor L m The other end is connected to the capacitor C. 012 The other end is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The capacitor C 011 One end is connected to the load R Ld One end is connected, the load R Ld The other end is connected to the capacitor C 012 The other end is connected, and by replacing the transformer module 105 with an inductor, a non-isolated DC transformer can be constructed. The inductor will help the switching transistor in the switching module 103 to achieve soft switching, and will also help the design of the boost inductor module 102.

[0037] Figure 3 The boost inductor module 102 described herein includes a boost inductor L U The resonant module 104 includes a capacitor C. r and inductor L r The rectifier module 106 includes field-effect transistors SR1 and SR2, and the output filter module 107 includes capacitor C. 011 and capacitor C 012 The DC power supply V in The positive terminal of 101 is connected to the boost inductor L. U One end is connected to the DC power supply V. in The negative terminal of 101 is grounded, and the boost inductor L UThe other end is connected to one end of the switch module 103, and the other end of the switch module 103 is connected to the DC power supply V. in The negative terminal of 101 is connected, and the boost inductor L U The other end is connected to capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the source of the field-effect transistor SR1, and the drain of the field-effect transistor SR1 is connected to the capacitor C. 011 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the capacitor C 012 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the DC power supply V in The negative terminal of 101, the capacitor C 012 The other end is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The capacitor C 011 One end is connected to the load R Ld One end is connected, the load R Ld The other end is connected to the capacitor C 012 The other end is connected. By removing the transformer module 105, another non-isolated DC transformer can be constructed. This method can reduce circuit components, lower system costs, and increase system power density.

[0038] Figure 4 The boost inductor module 102 includes a boost inductor L U The resonant module 104 includes a capacitor C. r and inductor L r The rectifier module 106 includes field-effect transistors SR1 and SR2, the output filter module 107 includes capacitor C0, and the DC power supply V in The negative terminal of 101 is connected to the boost inductor L U One end is connected to the DC power supply V. in The negative terminal of 101 is grounded, and the boost inductor L U The other end is connected to one end of the switch module 103, and the other end of the switch module 103 is connected to the DC power supply V. in The positive terminal of 101 is connected, and the other end of the switching module 103 is connected to one end of capacitor C0. The other end of capacitor C0 is connected to the drain of field-effect transistor SR1. One end of capacitor C0 is connected to the source of field-effect transistor SR2. The drain of field-effect transistor SR2 is connected to the source of field-effect transistor SR1. The source of field-effect transistor SR1 is connected to capacitor C0.r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the boost inductor L U The other end is connected, and the drain of the field-effect transistor SR1 is connected to the load R. Ld One end is connected, the load R Ld The other end is grounded. This embodiment provides another solution for removing the transformer module 105 and reconstructing the rectifier structure, which can form a non-isolated boost DC-DC converter.

[0039] exist Figure 5 The boost inductor module 102 described herein includes a boost inductor L U The resonant module 104 includes a capacitor C. r and inductor L r The transformer module 105 includes a magnetizing inductor L. m The rectifier module 106 includes a field-effect transistor SR1, a field-effect transistor SR2, and a capacitor C. b The output filter module 107 includes a capacitor C0, and the DC power supply V in The negative terminal of 101 is connected to the boost inductor L U One end is connected to the DC power supply V. in The negative terminal of 101 is grounded, and the boost inductor L U The other end is connected to one end of the switch module 103, and the other end of the switch module 103 is connected to the DC power supply V. in The positive terminal of 101 is connected, and the other end of the switching module 103 is connected to one end of the capacitor C0. The other end of the capacitor C0 is connected to the drain of the field-effect transistor SR1. One end of the capacitor C0 is connected to the source of the field-effect transistor SR2. The drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The source of the field-effect transistor SR1 is connected to the capacitor C0. b One end of the capacitor C is connected to the capacitor C. b The other end is connected to the capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the boost inductor L U The other end is connected to the excitation inductor L m One end is connected to the capacitor C r One end is connected to the excitation inductor L m The other end is connected to one end of the capacitor C0, and the drain of the field-effect transistor SR1 is connected to the load R.Ld One end is connected, the load R Ld The other end is grounded. This embodiment proposes an alternative solution to remove the transformer module 105. By replacing the transformer module 105 with an inductor and reconstructing the rectifier structure, a non-isolated boost DC-DC converter can be constructed. The inductor will facilitate the soft switching of the switching transistor in the switching module 103 and will also benefit the design of the boost inductor.

[0040] exist Figure 6 The boost inductor module 102 described herein includes a boost inductor L U The resonant module 104 includes a capacitor C. ULr Inductor L ULr Capacitor C r and inductor L r The transformer module 105 includes a transformer T UL and excitation inductance L ULm The rectifier module 106 includes field-effect transistors SR1, SR2, SR5, and SR6, and the output filter module 107 includes capacitor C. 02 Capacitor C 011 and capacitor C 012 The load 108 includes load R Ld1 and load R Ld2 The DC power supply V in The negative terminal of 101 is connected to the boost inductor L U One end is connected to the DC power supply V. in The negative terminal of 101 is grounded, and the boost inductor L U The other end is connected to one end of the switch module 103, and the other end of the switch module 103 is connected to the DC power supply V. in The positive terminal of 101 is connected, and the other end of the switch module 103 is connected to capacitor C. 02 One end is connected, the capacitor C 02 The other end is connected to the drain of the field-effect transistor SR5, and the capacitor C 02 One end of the capacitor is connected to the source of the field-effect transistor SR6, the drain of the field-effect transistor SR6 is connected to the source of the field-effect transistor SR5, and the source of the field-effect transistor SR5 is connected to the capacitor C. r One end is connected, and the drain of the field-effect transistor SR5 is connected to the load R. Ld2 One end is connected, the load R Ld2 The other end of the capacitor C is grounded. r The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the boost inductor L UThe other end is connected to the capacitor C. 02 One end is connected to the capacitor C ULr One end is connected, the C ULr The other end is connected to the inductor L ULr One end is connected, the inductor L ULr The other end is connected to the transformer T UL One end of the primary winding is connected to the transformer T. UL The other end of the primary winding is connected to the boost inductor L U The other end is connected to the excitation inductor L ULm Assuming the transformer T UL Within the primary winding of the transformer T UL One end of the secondary winding is connected to the source of the field-effect transistor SR1, and the drain of the field-effect transistor SR1 is connected to the capacitor C. 011 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the capacitor C 012 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the transformer T UL The other end of the secondary winding is connected to the capacitor C. 012 The other end is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The capacitor C 011 One end is connected to the load R Ld One end is connected, the load R Ld The other end is connected to the capacitor C 012 The other end is connected. This scheme proposes an embodiment with non-isolated high-voltage output and isolated low-voltage output, by... Figure 1 and Figure 4 The illustrated embodiments can be combined to form a circuit with high and low voltage output capabilities, thereby meeting the needs of various DC bus connections. Furthermore, it is also possible to... Figure 1 , Figure 2 (or Figure 3 )as well as Figure 4 Various combinations can be made to meet the needs of other applications.

[0041] exist Figure 7 In the above, the boost inductor module 102 includes a boost inductor L. L1 and boost inductor L R1 The resonant module 104 includes a capacitor C. r and inductor L r The transformer module 105 includes a transformer T r and inductor L mThe rectifier module 106 includes field-effect transistors SR1, SR2, SR3, and SR4; the output filter module 107 includes capacitor C0; the switch module 103 has two components, namely a first switch module and a second switch module; and the DC power supply V... in The positive terminal of 101 is connected to the boost inductor L. L1 One end is connected to the DC power supply V. in The negative terminal of 101 is grounded, and the boost inductor L L1 The other end is connected to one end of the first switch module, and the other end of the first switch module is connected to the DC power supply V. in The negative terminal of 101 is connected, and the boost inductor L L1 The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to transformer T r One end of the primary winding is connected to the transformer T. r The other end of the primary winding is connected to one end of the second switching module, and the other end of the second switching module is connected to the DC power supply V. in The negative terminal of 101 is connected, and the magnetizing inductor L ULm Assuming the transformer T UL Within the primary winding, the boost inductor L R1 One end is connected to the boost inductor L L1 One end is connected to the boost inductor L R1 The other end is connected to one end of the second switch module, and the transformer T r One end of the secondary winding of the transformer is connected to the source of the field-effect transistor SR1. The drain of the field-effect transistor SR1 is connected to the drain of the field-effect transistor SR3. The source of the field-effect transistor SR3 is connected to the drain of the field-effect transistor SR4. The source of the field-effect transistor SR4 is connected to the source of the field-effect transistor SR2. The drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. r The other end of the secondary winding is connected to the drain of the field-effect transistor SR4. The drain of the field-effect transistor SR3 is connected to one end of the capacitor C0. The other end of the capacitor C0 is connected to the source of the field-effect transistor SR4. One end of the capacitor C0 is connected to the load R. Ld One end is connected, the load R LdThe other end is connected to the other end of the capacitor C0. This scheme is another embodiment of the modular DC transformer 100, which can meet the requirements of high-power isolated output applications. Moreover, this embodiment can reduce the DC voltage bias of the capacitor in the resonant module 104 to zero, thereby facilitating capacitor design. Furthermore, when the resonant module 104 is no longer operating in resonant mode, the capacitor can be omitted, thereby further reducing costs. In addition, the boost inductor L in the figure... L1 and boost inductor L R1 Forward or reverse coupling can also be performed to further improve power density.

[0042] exist Figure 8 An embodiment with three-isolated outputs is shown, wherein the boost inductor module 102 includes a boost inductor L. U1 and boost inductor L R1 The resonant module 104 includes a capacitor C. r Inductor L r Capacitor C Lr Capacitor C Rr Inductor L Lr and inductor L Rr The transformer module 105 includes a transformer T r Transformer T L Transformer T R Magnetizing inductance L m Magnetizing inductance L Lm and excitation inductance L Rm The rectifier module 106 includes field-effect transistors SR1, SR2, SR3, SR4, and SR5. R1 SR Field-Effect Transistor R2 SR Field-Effect Transistor L1 and field-effect transistor SR L2 The output filter module 107 includes capacitor C0 and capacitor C. 011 Capacitor C 012 Capacitor C 021 and capacitor C 022 The switch module 103 has two components, namely a first switch module and a second switch module, and the load 108 includes a load R. Ld Load R Ld_L and load R Ld_R The DC power supply V in The positive terminal of 101 is connected to the boost inductor L. U1 One end is connected to the boost inductor L U1 The other end is connected to one end of the first switch module, and the other end of the first switch module is connected to the DC power supply V. inThe negative terminal of 101 is connected, and the boost inductor L U1 The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to transformer T r One end of the primary winding is connected to the transformer T. r The other end of the primary winding is connected to one end of the second switching module, and the other end of the second switching module is connected to the DC power supply V. in The negative terminal of 101 is connected, and the magnetizing inductor L m Located at the transformer T r In the primary winding, the inductor L r One end is connected to the inductor L Lr One end is connected, the inductor L Lr The other end is connected to the capacitor C Lr One end of the capacitor C is connected to the capacitor C. Lr The other end is connected to the transformer T L One end of the primary winding of the transformer T is connected. L The other end of the primary winding is grounded, and the excitation inductor L Lm Located at the transformer T L In the primary winding, the inductor L Rr One end of the inductor L is connected to one end of the second switch module. Rr The other end is connected to the capacitor C Rr One end of the capacitor C is connected to the capacitor C. Rr The other end is connected to the transformer T R One end of the primary winding of the transformer T is connected. R The other end of the primary winding is grounded, and the excitation inductor L Rm Located at the transformer T R Within the primary winding, the boost inductor L R1 One end is connected to the boost inductor L L1 One end is connected to the boost inductor L R1 The other end is connected to one end of the second switch module, and the transformer T r One end of the secondary winding is connected to the source of the field-effect transistor SR1, the drain of the field-effect transistor SR1 is connected to the drain of the field-effect transistor SR3, the source of the field-effect transistor SR3 is connected to the drain of the field-effect transistor SR4, the source of the field-effect transistor SR4 is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The transformer T... rThe other end of the secondary winding is connected to the drain of the field-effect transistor SR4. The drain of the field-effect transistor SR3 is connected to one end of the capacitor C0. The other end of the capacitor C0 is connected to the source of the field-effect transistor SR4. One end of the capacitor C0 is connected to the load R. Ld One end is connected, the load R Ld The other end is connected to the other end of the capacitor C0, and the transformer T L One end of the secondary winding is connected to the field-effect transistor SR L1 The source connection of the field-effect transistor SR L1 The drain of the capacitor C 021 One end of the capacitor C is connected to the capacitor C. 021 The other end is connected to the capacitor C 022 One end of the capacitor C is connected to the capacitor C. 021 The other end is connected to the transformer T L The other end of the secondary winding is connected to the capacitor C. 022 The other end is connected to the field-effect transistor SR L2 The source connection of the field-effect transistor SR L2 The drain of the field-effect transistor SR L1 The source connection, the capacitor C 021 One end is connected to the load R Ld_L One end is connected, the load R Ld_L The other end is connected to the capacitor C 022 The other end is connected to the transformer T R One end of the secondary winding is connected to the field-effect transistor SR R1 The source connection of the field-effect transistor SR R1 The drain of the capacitor C 011 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the capacitor C 012 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the transformer T R The other end of the secondary winding is connected to the capacitor C. 021 The other end is connected to the field-effect transistor SR R2 The source connection of the field-effect transistor SR R2 The drain of the field-effect transistor SR R1 The source connection, the capacitor C 011 One end is connected to the load R Ld_R One end is connected, the load R Ld_R The other end is connected to the capacitor C 012 Connect the other end. By... Figure 1 and Figure 7The illustrated embodiments can be combined to form a circuit with multiple isolated output capabilities. Furthermore, [the following can be added]... Figure 1 , Figure 2 , Figure 3 and Figure 7 Various combinations can be made to meet the needs of other applications. Additionally, Figure 8 The boost inductor L U1 and boost inductor L R1 Forward or reverse coupling can also be performed to further improve power density.

[0043] Figure 9 An embodiment with a non-isolated boost output and an isolated output is shown, wherein the boost inductor module 102 includes a boost inductor L. L1 and boost inductor L R1 The resonant module 104 includes a capacitor C. r Inductor L r Capacitor C Lr Capacitor C Rr Inductor L Lr and inductor L Rr The transformer module 105 includes a transformer T r and excitation inductance L m The rectifier module 106 includes field-effect transistors SR1, SR2, SR3, SR4, SR5, SR6, SR7, and SR8. The output filter module 107 includes capacitor C. 01 Capacitor C 02 and capacitor C 03 The switch module 103 has two components, namely a first switch module and a second switch module, and the load 108 includes a load R. Ld1 The DC power supply V in The positive terminal of 101 is connected to one end of the first switching module, and the other end of the first switching module is connected to the boost inductor L. L1 One end is connected to the boost inductor L L1 The other end is connected to the DC power supply V in The negative terminal of 101 is connected, and the capacitor C 02 One end of the capacitor C is connected to one end of the first switch module. 02 The other end is connected to the drain of the field-effect transistor SR5, the source of the field-effect transistor SR5 is connected to the drain of the field-effect transistor SR6, and the source of the field-effect transistor SR6 is connected to the capacitor C. 02 One end of the capacitor C is connected to the capacitor C. Lr One end of the capacitor is connected to the source of the field-effect transistor SR5, and the capacitor C LrThe other end is connected to the inductor L Lr One end is connected, the inductor L Lr The other end is connected to the boost inductor L L1 One end is connected, the inductor L r One end is connected to the boost inductor L L1 One end is connected, the inductor L r The other end is connected to the capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the transformer T r One end of the primary winding of the transformer T is connected. r The other end of the primary winding is connected to the boost inductor L R1 One end is connected to the excitation inductor L m Assuming the transformer T r Within the primary winding, the boost inductor L R1 The other end is connected to the DC power supply V in The negative terminal of 101 is connected, and the boost inductor L R1 One end of the second switch module is connected to one end of the second switch module, and the other end of the second switch module is connected to capacitor C. 03 One end of the capacitor C is connected to the capacitor C. 03 The other end is connected to the drain of the field-effect transistor SR7, the drain of the field-effect transistor SR7 is connected to the drain of the field-effect transistor SR5, the source of the field-effect transistor SR7 is connected to the drain of the field-effect transistor SR8, and the source of the field-effect transistor SR8 is connected to the capacitor C. 03 One end is connected, and the drain of the field-effect transistor SR8 is connected to the capacitor C. Rr One end of the capacitor C is connected to the capacitor C. Rr The other end is connected to the inductor L Rr One end is connected, the inductor L Rr The other end is connected to the boost inductor L R1 One end is connected to the transformer T. r One end of the secondary winding is connected to the source of the field-effect transistor SR1, the drain of the field-effect transistor SR1 is connected to the drain of the field-effect transistor SR3, the source of the field-effect transistor SR3 is connected to the drain of the field-effect transistor SR4, the source of the field-effect transistor SR4 is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The transformer T... r The other end of the secondary winding is connected to the drain of the field-effect transistor SR4, and the drain of the field-effect transistor SR3 is connected to the capacitor C. 01 One end of the capacitor C is connected to the capacitor C. 01 The other end is connected to the source of the field-effect transistor SR4, and the capacitor C01 One end is connected to the load R Ld1 One end is connected, the load R Ld1 The other end is connected to the capacitor C 01 The other end is connected to the capacitor C. 03 The other end is connected to the boost inductor L R1 The other end serves as the high-voltage output. This embodiment can satisfy circuit requirements for both high-power isolated and non-isolated high-voltage output. Furthermore, this embodiment can reduce the DC voltage bias across the capacitor in the resonant module to zero, thus facilitating capacitor design. Additionally, when the resonant module 104 is no longer operating in resonant mode, the capacitor can be omitted, further reducing costs. Figure 9 The boost inductor L in L1 and boost inductor L R1 Forward or reverse coupling can also be performed to further improve power density.

[0044] The switching module 103 is composed of several switching circuits SM connected in series. Each switching circuit SM employs a first half-bridge switch and / or a second half-bridge switch, and / or a full-bridge switch. The first half-bridge switch includes a field-effect transistor (FET) Q1, a field-effect transistor Q2, and a capacitor C1. The drain of FET Q1 is connected to one end of capacitor C1, and the other end of capacitor C1 is connected to the source of FET Q2. The drain of FET Q2 is connected to the source of FET Q1. The source and drain of FET Q2 are outputs. The second half-bridge switch includes a field-effect transistor Q1... 11 MOSFET Q 21 and capacitor C2, the field-effect transistor Q 11 The drain of the capacitor is connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to the field-effect transistor Q. 21 The source connection of the field-effect transistor Q 21 The drain of the field-effect transistor Q 11 The source connection of the field-effect transistor Q 11 The source and drain outputs; the full-bridge switch includes a field-effect transistor Q. 12 MOSFET Q 22 Field-effect transistors Q3 and Q4, and capacitor C3, wherein the field-effect transistor Q... 12 The drain of the transistor is connected to the drain of the field-effect transistor Q3. 12 The source of the field-effect transistor Q 22 The drain connection of the field-effect transistor Q 22 The source of capacitor C3 is connected to the source of transistor Q4, the source of transistor Q3 is connected to the drain of transistor Q4, and one end of capacitor C3 is connected to the drain of transistor Q4. 12The drain of capacitor C3 is connected to the drain of transistor Q. The other end of capacitor C3 is connected to the field-effect transistor Q. 22 The source connection of the field-effect transistor Q 12 The source of the transistor is the same as the source output of the field-effect transistor Q3. For example... Figure 10-12 As shown, the switching module 102 is composed of several switching circuits SM connected in series. The switching module 103 can be a half-bridge sub-module and / or a full-bridge sub-module. The switching network module can be formed by other types of controllable devices, such as metal-oxide-semiconductor field-effect transistors (MOSFETs), bipolar junction transistors (BJTs), superjunction transistors (SJTs), insulated-gate bipolar transistors (IGBTs), gallium nitride (GaN) devices, etc.

[0045] Figure 13 and Figure 14 In this context, the resonant module 104 can be implemented in various ways. It can operate in a resonant state, such as an inductor-inductor-capacitor (LLC) resonant circuit and / or similar circuits. Alternatively, it can operate in a non-resonant state, using a structure such as a DC blocking capacitor-inductor or an inductor without a DC blocking capacitor. When the modular DC transformer 100 requires bidirectional operation, the resonant module 104 can be added to the primary and secondary sides of the transformer module 105, respectively. Figure 13 As shown, this enables bidirectional step-up and step-down voltage capabilities. Series and parallel resonant inductors can be implemented as external inductors. For example, a series resonant inductor can be implemented as the leakage inductance of the transformer module 105.

[0046] In this embodiment, the transformer module 105 can be a transformer consisting of two windings, or it can be as follows: Figure 14 The transformer shown is composed of three windings. Furthermore, the transformer module 105 can be replaced and / or omitted using inductors, thereby forming a non-isolated modular DC transformer 100. It should be noted that the transformers described above and throughout the specification are merely examples and should not unduly limit the scope of the claims. The transformer module 105 may also further include various bias windings and gate drive auxiliary windings.

[0047] In this embodiment, the rectifier module 106 converts the alternating polarity waveform received from the output terminal of the transformer module 105 into a unipolar waveform. The rectifier module 106 can be a rectifier structure composed of diodes, or it can employ a full-wave rectifier structure, such as... Figure 14As shown in the diagram. Furthermore, the rectifier module 106 can be formed from other types of controllable devices, such as metal-oxide-semiconductor field-effect transistors (MOSFETs), bipolar junction transistors (BJTs), superjunction transistors (SJTs), insulated-gate bipolar transistors (IGBTs), gallium nitride (GaN) devices, etc. In this embodiment, when the rectifier module 106 uses fully controllable devices, the circuit can achieve bidirectional energy flow.

[0048] In an embodiment, the output filter module 107 may be composed of a capacitor or an LC filter consisting of an inductor-capacitor.

[0049] The DC power supply V in 101 can be a power supply that converts mains voltage to DC voltage. Alternatively, the DC power supply V in 101 can be a solar panel array. Additionally, the DC power supply V... in 101 can be an energy storage device such as a rechargeable battery or a fuel cell. The load 108 represents the power consumed by a circuit coupled to the modular DC transformer 100. Alternatively, the load 108 can refer to a downstream converter coupled to the output of the modular DC transformer 100.

[0050] like Figure 15 As shown, the modular DC transformer 100 can be implemented using an input series and output parallel architecture, suitable for high-voltage, high-current output applications. Each submodule can be selected from... Figures 1-9 The modular DC transformer 100 of any embodiment can be combined to form a circuit for processing high-power power supplies.

[0051] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A unipolar input DC transformer, characterized in that, Including DC power supply V in Boost inductor module, switching module, resonant module, magnetizing inductor L m The rectifier module and output filter module, wherein the boost inductor module includes a boost inductor L U The resonant module includes a capacitor C. r and inductor L r The rectifier module includes field-effect transistors SR1 and SR2, and the output filter module includes capacitor C. 011 and capacitor C 012 The DC power supply V in The positive terminal of the boost inductor L U One end is connected to the DC power supply V. in The negative terminal of the boost inductor L is grounded. U The other end is connected to one end of the switch module, and the other end of the switch module is connected to the DC power supply V. in The negative terminal of the boost inductor L is connected. U The other end is connected to capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the magnetizing inductor L m One end is connected to the excitation inductor L m One end of the magnetizing inductor L is connected to the source of the field-effect transistor SR1. m The other end is connected to the DC power supply V in The negative terminal of the field-effect transistor SR1 is connected to the capacitor C. 011 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the capacitor C 012 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the excitation inductor L m The other end is connected to the capacitor C. 012 The other end is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The capacitor C 011 One end is connected to the load R Ld One end is connected, the load R Ld The other end is connected to the capacitor C 012 The other end is connected.

2. A unipolar input DC transformer, characterized in that, Including DC power supply V in The system includes a boost inductor module, a switching module, a resonant module, a rectifier module, and an output filter module. The boost inductor module includes a boost inductor L. U The resonant module includes a capacitor C. r and inductor L r The rectifier module includes field-effect transistors SR1 and SR2, and the output filter module includes capacitor C. 011 and capacitor C 012 The DC power supply V in The positive terminal of the boost inductor L U One end is connected to the DC power supply V. in The negative terminal of the boost inductor L is grounded. U The other end is connected to one end of the switch module, and the other end of the switch module is connected to the DC power supply V. in The negative terminal of the boost inductor L is connected. U The other end is connected to capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the source of the field-effect transistor SR1, and the drain of the field-effect transistor SR1 is connected to the capacitor C. 011 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the capacitor C 012 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the DC power supply V in The negative terminal of the capacitor C is connected. 012 The other end is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The capacitor C 011 One end is connected to the load R Ld One end is connected, the load R Ld The other end is connected to the capacitor C 012 The other end is connected.

3. A unipolar input DC transformer, characterized in that, Including DC power supply V in The system includes a boost inductor module, a switching module, a resonant module, a rectifier module, and an output filter module. The boost inductor module includes a boost inductor L. U The resonant module includes a capacitor C. r and inductor L r The rectifier module includes field-effect transistors SR1 and SR2, the output filter module includes capacitor C0, and the DC power supply V... in The negative terminal of the boost inductor L U One end is connected to the DC power supply V. in The negative terminal of the boost inductor L is grounded. U The other end is connected to one end of the switch module, and the other end of the switch module is connected to the DC power supply V. in The positive terminal of the switch module is connected to the positive terminal of the MOSFET SR1. The other end of the switch module is connected to one end of capacitor C0. The other end of capacitor C0 is connected to the drain of MOSFET SR1. One end of capacitor C0 is connected to the source of MOSFET SR2. The drain of MOSFET SR2 is connected to the source of MOSFET SR1. The source of MOSFET SR1 is connected to capacitor C1. r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the boost inductor L U The other end is connected, with the drain of the field-effect transistor SR1 connected to the load R. Ld One end is connected, the load R Ld The other end is grounded.

4. A unipolar input DC transformer, characterized in that, Including DC power supply V in Boost inductor module, switching module, resonant module, magnetizing inductor L m The rectifier module and output filter module, wherein the boost inductor module includes a boost inductor L U The resonant module includes a capacitor C. r and inductor L r The rectifier module includes field-effect transistors SR1 and SR2 and capacitor C. b The output filter module includes a capacitor C0, and the DC power supply V... in The negative terminal of the boost inductor L U One end is connected to the DC power supply V. in The negative terminal of the boost inductor L is grounded. U The other end is connected to one end of the switch module, and the other end of the switch module is connected to the DC power supply V. in The positive terminal of the switch module is connected to the positive terminal of the capacitor C0. The other end of the capacitor C0 is connected to the drain of the field-effect transistor SR1. One end of the capacitor C0 is connected to the source of the field-effect transistor SR2. The drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The source of the field-effect transistor SR1 is connected to the positive terminal of the capacitor C0. b One end of the capacitor C is connected to the capacitor C. b The other end is connected to the capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the boost inductor L U The other end is connected to the excitation inductor L m One end is connected to the capacitor C r One end is connected to the excitation inductor L m The other end is connected to one end of the capacitor C0, and the drain of the field-effect transistor SR1 is connected to the load R. Ld One end is connected, the load R Ld The other end is grounded.

5. A unipolar input DC transformer, characterized in that, Including DC power supply V in The system includes a boost inductor module, a switching module, a resonant module, a transformer module, a rectifier module, and an output filter module. The boost inductor module includes a boost inductor L. U The resonant module includes a capacitor C. ULr Inductor L ULr Capacitor C r and inductor L r The transformer module includes transformer T UL and excitation inductance L ULm The rectifier module includes field-effect transistors SR1, SR2, SR5, and SR6, and the output filter module includes capacitor C. 02 Capacitor C 011 and capacitor C 012 The load includes load R Ld1 and load R Ld2 The DC power supply V in The negative terminal of the boost inductor L U One end is connected to the DC power supply V. in The negative terminal of the boost inductor L is grounded. U The other end is connected to one end of the switch module, and the other end of the switch module is connected to the DC power supply V. in The positive terminal of the switch module is connected to the capacitor C. 02 One end is connected, the capacitor C 02 The other end is connected to the drain of the field-effect transistor SR5, and the capacitor C 02 One end of the capacitor is connected to the source of the field-effect transistor SR6, the drain of the field-effect transistor SR6 is connected to the source of the field-effect transistor SR5, and the source of the field-effect transistor SR5 is connected to the capacitor C. r One end is connected, and the drain of the field-effect transistor SR5 is connected to the load R. Ld2 One end is connected, the load R Ld2 The other end of the capacitor C is grounded. r The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the boost inductor L U The other end is connected to the capacitor C. 02 One end is connected to the capacitor C ULr One end is connected, the C ULr The other end is connected to the inductor L ULr One end is connected, the inductor L ULr The other end is connected to the transformer T UL One end of the primary winding is connected to the transformer T. UL The other end of the primary winding is connected to the boost inductor L U The other end is connected to the excitation inductor L ULm Assuming the transformer T UL Within the primary winding of the transformer T UL One end of the secondary winding is connected to the source of the field-effect transistor SR1, and the drain of the field-effect transistor SR1 is connected to the capacitor C. 011 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the capacitor C 012 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the transformer T UL The other end of the secondary winding is connected to the capacitor C. 012 The other end is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The capacitor C 011 One end is connected to the load R Ld1 One end is connected, the load R Ld1 The other end is connected to the capacitor C 012 The other end is connected.

6. A unipolar input DC transformer, characterized in that, Including DC power supply V in The system includes a boost inductor module, a switching module, a resonant module, a transformer module, a rectifier module, and an output filter module. The boost inductor module includes a boost inductor L. L1 and boost inductor L R1 The resonant module includes a capacitor C. r and inductor L r The transformer module includes transformer T r and inductor L m The rectifier module includes field-effect transistors SR1, SR2, SR3, and SR4; the output filter module includes capacitor C0; and there are two switching modules, namely a first switching module and a second switching module. The DC power supply V... in The positive terminal of the boost inductor L L1 One end is connected to the DC power supply V. in The negative terminal of the boost inductor L is grounded. L1 The other end is connected to one end of the first switch module, and the other end of the first switch module is connected to the DC power supply V. in The negative terminal of the boost inductor L is connected. L1 The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to transformer T r One end of the primary winding is connected to the transformer T. r The other end of the primary winding is connected to one end of the second switching module, and the other end of the second switching module is connected to the DC power supply V. in The negative terminal of the inductor L is connected. m Assuming the transformer T r Within the primary winding, the boost inductor L R1 One end is connected to the boost inductor L L1 One end is connected to the boost inductor L R1 The other end is connected to one end of the second switch module, and the transformer T r One end of the secondary winding of the transformer is connected to the source of the field-effect transistor SR1. The drain of the field-effect transistor SR1 is connected to the drain of the field-effect transistor SR3. The source of the field-effect transistor SR3 is connected to the drain of the field-effect transistor SR4. The source of the field-effect transistor SR4 is connected to the source of the field-effect transistor SR2. The drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. r The other end of the secondary winding is connected to the drain of the field-effect transistor SR4. The drain of the field-effect transistor SR3 is connected to one end of the capacitor C0. The other end of the capacitor C0 is connected to the source of the field-effect transistor SR4. One end of the capacitor C0 is connected to the load R. Ld One end is connected, the load R Ld The other end is connected to the other end of the capacitor C0.

7. A unipolar input DC transformer, characterized in that, Including DC power supply V in The system includes a boost inductor module, a switching module, a resonant module, a transformer module, a rectifier module, and an output filter module. The boost inductor module includes a boost inductor L. U1 and boost inductor L R1 The resonant module includes a capacitor C. r Inductor L r Capacitor C Lr Capacitor C Rr Inductor L Lr and inductor L Rr The transformer module includes transformer T r Transformer T L Transformer T R Magnetizing inductance L m Magnetizing inductance L Lm and excitation inductance L Rm The rectifier module includes field-effect transistors SR1, SR2, SR3, SR4, and SR5. R1 SR Field-Effect Transistor R2 SR Field-Effect Transistor L1 and field-effect transistor SR L2 The output filter module includes capacitor C0 and capacitor C. 011 Capacitor C 012 Capacitor C 021 and capacitor C 022 The switch module comprises two modules: a first switch module and a second switch module. The load includes load R. Ld Load R Ld_L and load R Ld_R The DC power supply V in The positive terminal of the boost inductor L U1 One end is connected to the boost inductor L U1 The other end is connected to one end of the first switch module, and the other end of the first switch module is connected to the DC power supply V. in The negative terminal of the boost inductor L is connected. U1 The other end is connected to the inductor L r One end is connected, the inductor L r The other end is connected to the capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to transformer T r One end of the primary winding is connected to the transformer T. r The other end of the primary winding is connected to one end of the second switching module, and the other end of the second switching module is connected to the DC power supply V. in The negative terminal is connected, and the excitation inductor L m Assuming the transformer T r In the primary winding, the inductor L r One end is connected to the inductor L Lr One end is connected, the inductor L Lr The other end is connected to the capacitor C Lr One end of the capacitor C is connected to the capacitor C. Lr The other end is connected to the transformer T L One end of the primary winding of the transformer T is connected. L The other end of the primary winding is grounded, and the excitation inductor L Lm Assuming the transformer T L In the primary winding, the inductor L Rr One end of the inductor L is connected to one end of the second switch module. Rr The other end is connected to the capacitor C Rr One end of the capacitor C is connected to the capacitor C. Rr The other end is connected to the transformer T R One end of the primary winding of the transformer T is connected. R The other end of the primary winding is grounded, and the excitation inductor L Rm Assuming the transformer T R Within the primary winding, the boost inductor L R1 One end is connected to the boost inductor L L1 One end is connected to the boost inductor L R1 The other end is connected to one end of the second switch module, and the transformer T r One end of the secondary winding is connected to the source of the field-effect transistor SR1, the drain of the field-effect transistor SR1 is connected to the drain of the field-effect transistor SR3, the source of the field-effect transistor SR3 is connected to the drain of the field-effect transistor SR4, the source of the field-effect transistor SR4 is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The transformer T... r The other end of the secondary winding is connected to the drain of the field-effect transistor SR4. The drain of the field-effect transistor SR3 is connected to one end of the capacitor C0. The other end of the capacitor C0 is connected to the source of the field-effect transistor SR4. One end of the capacitor C0 is connected to the load R. Ld One end is connected, the load R Ld The other end is connected to the other end of the capacitor C0, and the transformer T L One end of the secondary winding is connected to the field-effect transistor SR L1 The source connection of the field-effect transistor SR L1 The drain of the capacitor C 021 One end of the capacitor C is connected to the capacitor C. 021 The other end is connected to the capacitor C 022 One end of the capacitor C is connected to the capacitor C. 021 The other end is connected to the transformer T L The other end of the secondary winding is connected to the capacitor C. 022 The other end is connected to the field-effect transistor SR L2 The source connection of the field-effect transistor SR L2 The drain of the field-effect transistor SR L1 The source connection, the capacitor C 021 One end is connected to the load R Ld_L One end is connected, the load R Ld_L The other end is connected to the capacitor C 022 The other end is connected to the transformer T R One end of the secondary winding is connected to the field-effect transistor SR R1 The source connection of the field-effect transistor SR R1 The drain of the capacitor C 011 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the capacitor C 012 One end of the capacitor C is connected to the capacitor C. 011 The other end is connected to the transformer T R The other end of the secondary winding is connected to the capacitor C. 021 The other end is connected to the field-effect transistor SR R2 The source connection of the field-effect transistor SR R2 The drain of the field-effect transistor SR R1 The source connection, the capacitor C 011 One end is connected to the load R Ld_R One end is connected, the load R Ld_R The other end is connected to the capacitor C 012 The other end is connected.

8. A unipolar input DC transformer, characterized in that, Including DC power supply V in The system includes a boost inductor module, a switching module, a resonant module, a transformer module, a rectifier module, and an output filter module. The boost inductor module includes a boost inductor L. L1 and boost inductor L R1 The resonant module includes a capacitor C. r Inductor L r Capacitor C Lr Capacitor C Rr Inductor L Lr and inductor L Rr The transformer module includes transformer T r and excitation inductance L m The rectifier module includes field-effect transistors SR1, SR2, SR3, SR4, SR5, SR6, SR7, and SR8. The output filter module includes capacitor C. 01 Capacitor C 02 and capacitor C 03 The switching module comprises two modules, namely a first switching module and a second switching module, and the DC power supply V... in The positive terminal is connected to one end of the first switching module, and the other end of the first switching module is connected to the boost inductor L. L1 One end is connected to the boost inductor L L1 The other end is connected to the DC power supply V in The negative terminal of the capacitor C is connected. 02 One end of the capacitor C is connected to one end of the first switch module. 02 The other end is connected to the drain of the field-effect transistor SR5, the source of the field-effect transistor SR5 is connected to the drain of the field-effect transistor SR6, and the source of the field-effect transistor SR6 is connected to the capacitor C. 02 One end of the capacitor C is connected to the capacitor C. Lr One end of the capacitor is connected to the source of the field-effect transistor SR5, and the capacitor C Lr The other end is connected to the inductor L Lr One end is connected, the inductor L Lr The other end is connected to the boost inductor L L1 One end is connected, the inductor L r One end is connected to the boost inductor L L1 One end is connected, the inductor L r The other end is connected to the capacitor C r One end of the capacitor C is connected to the capacitor C. r The other end is connected to the transformer T r One end of the primary winding of the transformer T is connected. r The other end of the primary winding is connected to the boost inductor L R1 One end is connected to the excitation inductor L m Assuming the transformer T r Within the primary winding, the boost inductor L R1 The other end is connected to the DC power supply V in The negative terminal of the boost inductor L is connected. R1 One end of the second switch module is connected to one end of the second switch module, and the other end of the second switch module is connected to capacitor C. 03 One end of the capacitor C is connected to the capacitor C. 03 The other end is connected to the drain of the field-effect transistor SR7, the drain of the field-effect transistor SR7 is connected to the drain of the field-effect transistor SR5, the source of the field-effect transistor SR7 is connected to the drain of the field-effect transistor SR8, and the source of the field-effect transistor SR8 is connected to the capacitor C. 03 One end is connected, and the drain of the field-effect transistor SR8 is connected to the capacitor C. Rr One end of the capacitor C is connected to the capacitor C. Rr The other end is connected to the inductor L Rr One end is connected, the inductor L Rr The other end is connected to the boost inductor L R1 One end is connected to the transformer T. r One end of the secondary winding is connected to the source of the field-effect transistor SR1, the drain of the field-effect transistor SR1 is connected to the drain of the field-effect transistor SR3, the source of the field-effect transistor SR3 is connected to the drain of the field-effect transistor SR4, the source of the field-effect transistor SR4 is connected to the source of the field-effect transistor SR2, and the drain of the field-effect transistor SR2 is connected to the source of the field-effect transistor SR1. The transformer T... r The other end of the secondary winding is connected to the drain of the field-effect transistor SR4, and the drain of the field-effect transistor SR3 is connected to the capacitor C. 01 One end of the capacitor C is connected to the capacitor C. 01 The other end is connected to the source of the field-effect transistor SR4, and the capacitor C 01 One end is connected to the load R Ld1 One end is connected, the load R Ld1 The other end is connected to the capacitor C 01 The other end is connected to the capacitor C. 03 The other end is connected to the boost inductor L R1 The other end serves as the high-voltage output.

9. A unipolar input DC transformer according to any one of claims 1-8, characterized in that, The switching module consists of several switching circuits SM connected in series. Each switching circuit SM employs a first half-bridge switch, a second half-bridge switch, or a full-bridge switch. The first half-bridge switch includes a field-effect transistor (FET) Q1, a field-effect transistor Q2, and a capacitor C1. The drain of FET Q1 is connected to one end of capacitor C1, and the other end of capacitor C1 is connected to the source of FET Q2. The drain of FET Q2 is connected to the source of FET Q1. The source and drain of FET Q2 provide output. The second half-bridge switch includes a field-effect transistor Q1... 11 , field-effect transistor Q 21 and capacitor C2, the field-effect transistor Q 11 The drain of the capacitor is connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected to the field-effect transistor Q. 21 The source connection of the field-effect transistor Q 21 The drain of the field-effect transistor Q 11 The source connection of the field-effect transistor Q 11 The source and drain outputs; the full-bridge switch includes a field-effect transistor Q. 12 , field-effect transistor Q 22 Field-effect transistors Q3 and Q4, and capacitor C3, wherein the field-effect transistor Q... 12 The drain of the transistor is connected to the drain of the field-effect transistor Q3. 12 The source of the field-effect transistor Q 22 The drain connection of the field-effect transistor Q 22 The source of capacitor C3 is connected to the source of transistor Q4, the source of transistor Q3 is connected to the drain of transistor Q4, and one end of capacitor C3 is connected to the drain of transistor Q4. 12 The drain of capacitor C3 is connected to the drain of transistor Q. The other end of capacitor C3 is connected to transistor Q. 22 The source connection of the field-effect transistor Q 12 The source of the transistor is the same as the source output of the field-effect transistor Q3.

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