A bipolar input dc transformer

Abstract

The application provides a bipolar input DC transformer, comprising a DC power supply, a boost inductor module, a switch module, a resonance module, a transformer module, a rectifier module and an output filter module, the output end of the DC power supply is connected with the input end of the boost inductor module, the output end of the boost inductor module is connected with the input end of the switch module, the output end of the switch module is grounded, the other end of the first boost inductor and the other end of the second boost inductor are both connected with the input end of the resonance module, the output 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 DC transformer has continuous input inductor current, the design difficulty of the input filter is reduced, the semiconductor devices can all realize soft switching, and the system efficiency and power density are improved.

Description

Technical Field

[0001] This invention belongs to the field of transformers, and particularly relates to a bipolar 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] The purpose of this invention is to provide a bipolar input DC transformer that addresses the problems of low power density, resonant frequency being directly related to the number of sub-modules, expensive filters, and the inability to achieve soft switching of all switching transistors in existing solutions.

[0005] This invention is implemented as follows: a bipolar 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 output terminal of the DC power supply is connected to the input terminal of the boost inductor module, and the output terminal of the boost inductor module is connected to the input terminal of the switch module. The output terminal of the switch module is grounded. The boost inductor module includes a first boost inductor and a second boost inductor. The switch module includes a first switch module and a second switch module. in The positive terminal is connected to one end of the first boost inductor, the other end of the first boost inductor is connected to the input terminal of the first switching module, the output terminal of the first switching module is grounded, and the DC power supply V inThe negative terminal of the first boost inductor is connected to one end of the second boost inductor, the other end of the second boost inductor is connected to the input terminal of the second switching module, the output terminal of the second switching module is grounded, the other ends of the first boost inductor and the second boost inductor are both connected to the input terminal of the resonant module, the output terminal 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, the output terminal of the filter module is connected to the load, and the load is connected to the circuit output terminal.

[0006] A further technical solution of the present invention is: the resonant module includes a capacitor C. Lr Capacitor C Ur and inductor L r The transformer module includes transformer T r and excitation inductance L m The rectifier module includes field-effect transistors SR1, SR2, SR3, and SR4; the output filter module includes capacitor C0; and the DC power supply V... in The positive terminal of the first boost inductor L U One end is connected to the first boost inductor L U The other end is connected to the input terminal of the first switch module, and the output terminal of the first switch module is grounded. The DC power supply V in The negative terminal of the second boost inductor L L One end is connected to the second boost inductor L L The other end is connected to the input terminal of the second switching module, and the output terminal of the second switching module is grounded. The first boost inductor L U The other end is connected to the capacitor C Ur One end of the capacitor C is connected to the capacitor C. Ur 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 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 capacitor C Lr One end of the capacitor C is connected to the capacitor C. Lr The other end is connected to the second boost inductor L L The other end is connected to the excitation inductor L m Located at the transformer T r Within the primary winding of the transformer T rOne 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.

[0007] A further technical solution of the present invention is: the resonant module includes a capacitor C. Lr Capacitor C Ur Capacitor C ULr Capacitor C LLr Inductor L r Inductor L ULr and inductor L LLr The transformer module includes transformer T r Transformer T UL Transformer T LL Magnetizing inductance L ULm Magnetizing inductance L LLm and excitation inductance L m The rectifier module includes field-effect transistors SR1, SR2, SR3, SR4, and SR5. U1 SR Field-Effect Transistor U2 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 load includes load R Ld Load R Ld_U and load R Ld_L The DC power supply V in The positive terminal of the first boost inductor L U One end is connected to the first boost inductor L U The other end is connected to the input terminal of the first switch module, and the output terminal of the first switch module is grounded. The DC power supply V in The negative terminal of the second boost inductor L LOne end is connected to the second boost inductor L L The other end is connected to the input terminal of the second switch module, and the output terminal of the second switch module is grounded. The capacitor C ULr One end is connected to the first boost inductor L U The other end is connected to the capacitor 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 of the transformer T is connected. UL The other end of the primary winding is grounded, and the excitation inductor L ULm Located at the transformer T UL Within the primary winding, the capacitor C LLr One end is connected to the second boost inductor L L The other end is connected to the capacitor C. LLr The other end is connected to the inductor L LLr One end is connected, the inductor L LLr The other end is connected to the transformer T LL One end of the primary winding of the transformer T is connected. LL The other end of the primary winding is grounded, and the excitation inductor L LLm Located at the transformer T LL Within the primary winding, the capacitor C Ur One end is connected to the first boost inductor L U The other end is connected to the capacitor C. Ur 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 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 capacitor C Lr One end is connected to the excitation inductor L m Located at the transformer T r Within the primary winding, the capacitor C Lr The other end is connected to the second boost inductor L L The other end is connected to 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. 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 UL One end of the secondary winding is connected to the field-effect transistor SR U1 The source connection of the field-effect transistor SR U1 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 UL The other end of the secondary winding is connected to the capacitor C. 012 The other end is connected to the field-effect transistor SR U2 The source connection of the field-effect transistor SR U2 The drain of the field-effect transistor SR U1 The source connection of the capacitor C 011 One end is connected to the load R Ld_U One end is connected, the load R Ld_U The other end is connected to the capacitor C 012 The other end is connected to the transformer T. LL 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 LL 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 of 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.

[0008] A further technical solution of the present invention is: the resonant module includes a capacitor C. rand inductor L r The transformer module includes transformer T r and excitation inductance L m The rectifier module includes field-effect transistors SR1, SR2, SR3, and SR4; the output filter module includes capacitor C0; and the DC power supply V... in The positive terminal is connected to the input terminal of the first switching module, and the output terminal of the first switching module is connected to the first boost inductor L. U1 One end is connected to the first boost inductor L U1 The other end is grounded, and the DC power supply V in The negative terminal is connected to the input terminal of the second switching module, and the output terminal of the second switching module is connected to the second boost inductor L. L1 One end is connected to the second boost inductor L L1 The other end is grounded, and the output terminal of the first switching module 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 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 output terminal of the second switching module, 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 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.

[0009] A further technical solution of the present invention is: the resonant module includes a capacitor C. Lr Capacitor C Ur Capacitor C ULr Capacitor C LLr Inductor Lr Inductor L ULr and inductor L LLr The transformer module includes transformer T r Transformer T UL Transformer T LL Magnetizing inductance L ULm Magnetizing inductance L LLm and excitation inductance L m The rectifier module includes field-effect transistors SR1, SR2, SR3, SR4, and SR5. U1 SR Field-Effect Transistor U2 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 load includes load R Ld Load R Ld_U and load R Ld_L The DC power supply V in The positive terminal is connected to the input terminal of the first switching module, and the output terminal of the first switching module is connected to the first boost inductor L. U1 One end is connected to the first boost inductor L U1 The other end is grounded, and the DC power supply V in The negative terminal is connected to the input terminal of the second switching module, and the output terminal of the second switching module is connected to the second boost inductor L. L1 One end is connected to the second boost inductor L L1 The other end of the capacitor C is grounded. ULr One end is connected to the DC power supply V in The positive terminal of the capacitor C is connected. 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 of the transformer T is connected. UL The other end of the primary winding is connected to the first boost inductor L U1 One end is connected to the excitation inductor L ULm Located at the transformer T UL Within the primary winding, the capacitor C LLr One end is connected to the DC power supply V in The negative terminal of the capacitor C is connected. LLr The other end is connected to the inductor L LLr One end is connected, the inductor LLLr The other end is connected to the transformer T LL One end of the primary winding of the transformer T is connected. LL The other end of the primary winding is connected to the second boost inductor L L1 One end is connected to the excitation inductor L LLm Located at the transformer T LL Within the primary winding, the output terminal of the first switching module is connected to the inductor L. r One end is connected, the inductor L r 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 r One end of the primary winding of the transformer T is connected. LL The other end of the primary winding is connected to the output terminal of the second switching module, 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 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, and the transformer T UL One end of the secondary winding is connected to the field-effect transistor SR U1 The source connection of the field-effect transistor SR U1 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 UL The other end of the secondary winding is connected to the capacitor C. 012 The other end is connected to the field-effect transistor SR U2 The source connection of the field-effect transistor SR U2 The drain of the field-effect transistor SR U1 The source connection of the capacitor C011 One end is connected to the load R Ld_U One end is connected, the load R Ld_U The other end is connected to the capacitor C 012 The other end is connected to the transformer T. LL 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 LL 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 of 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.

[0010] A further technical solution of the present invention is: the resonant module includes a capacitor C. Lr Capacitor C Ur Inductor L Ur and inductor L Lr The rectifier module includes field-effect transistors SR1, SR2, SR3, and SR4, and the output filter module includes capacitor C. 02 and capacitor C 01 The DC power supply V in The positive terminal is connected to the input terminal of the first switching module, and the output terminal of the first switching module is connected to the first boost inductor L. U One end is connected to the first boost inductor L U The other end is grounded, and the DC power supply V in The negative terminal is connected to the input terminal of the second switching module, and the output terminal of the second switching module is connected to the second boost inductor L. L One end is connected to the second boost inductor L L The other end of the capacitor C is grounded. 01 One end of the capacitor C is connected to the input terminal of the first switch module. 01The other end is connected to the drain of the field-effect transistor SR2, the source of the field-effect transistor SR2 is connected to the drain of the field-effect transistor SR1, and the source of the field-effect transistor SR1 is connected to the capacitor C. 01 One end is connected, and the drain of the field-effect transistor SR1 is connected to the capacitor C. Ur One end of the capacitor C is connected to the capacitor C. Ur The other end is connected to the inductor L Ur One end is connected, the inductor L Ur The other end is connected to the first boost inductor L U One end of the capacitor C is connected to the capacitor C. 02 One end of the capacitor C is connected to the input terminal of the second switch module. 02 The other end is connected to the source of the field-effect transistor SR3, the source of the field-effect transistor SR4 is connected to the drain of the field-effect transistor SR3, and the drain of the field-effect transistor SR4 is connected to the capacitor C. 02 One end is connected, and the drain of the field-effect transistor SR3 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 inductor L Lr One end is connected, the inductor L Lr The other end is connected to the second boost inductor L L One end is connected, and the drain of the field-effect transistor SR2 and the source of the field-effect transistor SR3 are used as high-voltage outputs.

[0011] A further technical solution of the present invention is: the resonant module includes a capacitor C. Lr Capacitor C Ur Capacitor C ULr Capacitor C LLr Inductor L r Inductor L ULr and inductor L LLr The rectifier module includes field-effect transistors SR1, SR2, SR3, SR4, and SR5. U1 SR Field-Effect Transistor U2 SR Field-Effect Transistor L1 and field-effect transistor SR L2 The transformer module includes transformer T UL Transformer T LL Magnetizing inductance L ULm and excitation inductance L LLm The output filter module includes capacitor C. 02 Capacitor C 01 Capacitor C 011 Capacitor C 012 Capacitor C 021 and capacitor C022 The DC power supply V in The positive terminal is connected to the input terminal of the first switching module, and the output terminal of the first switching module is connected to the first boost inductor L. U One end is connected to the first boost inductor L U The other end is grounded, and the DC power supply V in The negative terminal is connected to the input terminal of the second switching module, and the output terminal of the second switching module is connected to the second boost inductor L. L One end is connected to the second boost inductor L L The other end of the capacitor C is grounded. 01 One end of the capacitor C is connected to the input terminal of the first switch module. 01 The other end is connected to the drain of the field-effect transistor SR2, the source of the field-effect transistor SR2 is connected to the drain of the field-effect transistor SR1, and the source of the field-effect transistor SR1 is connected to the capacitor C. 01 One end is connected, and the drain of the field-effect transistor SR1 is connected to the capacitor C. Ur One end of the capacitor C is connected to the capacitor C. Ur The other end is connected to the inductor L Ur One end is connected, the inductor L Ur The other end is connected to the first boost inductor L U One end of the capacitor C is connected to the capacitor C. 02 One end of the capacitor C is connected to the input terminal of the second switch module. 02 The other end is connected to the source of the field-effect transistor SR3, the source of the field-effect transistor SR4 is connected to the drain of the field-effect transistor SR3, and the drain of the field-effect transistor SR4 is connected to the capacitor C. 02 One end is connected, and the drain of the field-effect transistor SR3 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 inductor L Lr One end is connected, the inductor L Lr The other end is connected to the second boost inductor L L One end of the capacitor C is connected to the capacitor C. ULr One end is connected to the DC power supply V in The positive terminal of the capacitor C is connected. 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 of the transformer T is connected. UL The other end of the primary winding is connected to the first boost inductor L U One end is connected to the excitation inductor LULm Located at the transformer T UL Within the primary winding, the capacitor C LLr One end is connected to the DC power supply V in The negative terminal of the capacitor C is connected. LLr The other end is connected to the inductor L LLr One end is connected, the inductor L LLr The other end is connected to the transformer T LL One end of the primary winding of the transformer T is connected. LL The other end of the primary winding is connected to the second boost inductor L L One end is connected to the excitation inductor L LLm Located at the transformer T LL Within the primary winding of the transformer T UL One end of the secondary winding is connected to the field-effect transistor SR U1 The source connection of the field-effect transistor SR U1 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 UL The other end of the secondary winding is connected to the capacitor C. 012 The other end is connected to the field-effect transistor SR U2 The source connection of the field-effect transistor SR U2 The drain of the field-effect transistor SR U1 The source connection of the capacitor C 011 One end is connected to the load R Ld_U One end is connected, the load R Ld_U The other end is connected to the capacitor C 012 The other end is connected to the transformer T. LL 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 LL 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 of the capacitor C021 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, and the drain of the field-effect transistor SR2 and the source of the field-effect transistor SR3 are used as high-voltage outputs.

[0012] A further technical solution of the present invention is: the resonant module includes a capacitor C. Lr Capacitor C r Capacitor C Ur Inductor L Ur Inductor L r and inductor L Lr The transformer module includes transformer T r and excitation inductance L m The rectifier module includes field-effect transistors SR1, SR2, SR3, and SR4, and the output filter module includes capacitor C. 02 and capacitor C 01 The DC power supply V in The positive terminal is connected to the input terminal of the first switching module, and the output terminal of the first switching module is connected to the first boost inductor L. U One end is connected to the first boost inductor L U The other end is grounded, and the DC power supply V in The negative terminal is connected to the input terminal of the second switching module, and the output terminal of the second switching module is connected to the second boost inductor L. L One end is connected to the second boost inductor L L The other end of the capacitor C is grounded. 01 One end of the capacitor C is connected to the input terminal of the first switch module. 01 The other end is connected to the drain of the field-effect transistor SR2, the source of the field-effect transistor SR2 is connected to the drain of the field-effect transistor SR1, and the source of the field-effect transistor SR1 is connected to the capacitor C. 01 One end is connected, and the drain of the field-effect transistor SR1 is connected to the capacitor C. Ur One end of the capacitor C is connected to the capacitor C. Ur The other end is connected to the inductor L Ur One end is connected, the inductor L Ur The other end is connected to the first boost inductor L U One end of the capacitor C is connected to the capacitor C. 02 One end of the capacitor C is connected to the input terminal of the second switch module. 02The other end is connected to the source of the field-effect transistor SR3, the source of the field-effect transistor SR4 is connected to the drain of the field-effect transistor SR3, and the drain of the field-effect transistor SR4 is connected to the capacitor C. 02 One end is connected, and the drain of the field-effect transistor SR3 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 inductor L Lr One end is connected, the inductor L Lr The other end is connected to the second boost inductor L L One end is connected, the inductor L r One end is connected to the inductor L Ur The other end is connected to 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 inductor L Lr The other end is connected to 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 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, and the drain of the field-effect transistor SR2 and the source of the field-effect transistor SR3 are used as high-voltage outputs.

[0013] A further technical solution of the present invention is as follows: the switching module is composed of several switching circuits SM connected in series. The switching circuit SM adopts 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 , 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 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.

[0014] 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 can achieve 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

[0015] Figure 1 This is the first implementation circuit with bipolar input provided in the embodiments of the present invention;

[0016] Figure 2This is the first implementation circuit with bipolar input and triple-isolated output provided in the embodiments of the present invention;

[0017] Figure 3 This is a second implementation circuit with bipolar input provided in the embodiments of the present invention;

[0018] Figure 4 This is a second implementation circuit with bipolar input and triple-isolated output provided in the embodiments of the present invention;

[0019] Figure 5 This is the third implementation circuit with bipolar input provided in the embodiments of the present invention;

[0020] Figure 6 This is an embodiment of the circuit provided by the present invention, which has a bipolar input, a non-isolated output, and two isolated outputs;

[0021] Figure 7 This is an embodiment of the circuit provided by the present invention, which has a bipolar input, a non-isolated output, and an isolated output;

[0022] Figure 8 The circuit diagram of the first half-bridge switch is shown;

[0023] Figure 9 The circuit diagram of the second half-bridge switch is shown;

[0024] Figure 10 The circuit diagram of the full-bridge switch is shown;

[0025] Figure 11 The implementation circuits of the primary and secondary resonant cavities of the transformer are shown;

[0026] Figure 12 The implementation circuit of the transformer secondary side and the rectifier is shown;

[0027] Figure 13 The implementation circuit of the modular DC transformer using an input series and output parallel architecture is shown. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] This invention provides a bipolar input DC transformer, including a DC power supply V. in 101. Boost inductor module; 102. Switch module; 103. Resonant module; 104. Transformer module; 105. Rectifier module; 106. Output filter module; and 107. The DC power supply V in The output terminal of 101 is connected to the input terminal of the boost inductor module 102, the output terminal of the boost inductor module 102 is connected to the input terminal of the switch module 103, and the output terminal of the switch module 103 is grounded. The boost inductor module 102 includes a first boost inductor and a second boost inductor, and the switch module 103 includes a first switch module and a second switch module. The DC power supply V... in The positive terminal of 101 is connected to one end of the first boost inductor, the other end of the first boost inductor is connected to the input terminal of the first switching module, the output terminal of the first switching module is grounded, and the DC power supply V in The negative terminal of 101 is connected to one end of the second boost inductor, the other end of the second boost inductor is connected to the input terminal of the second switching module, the output terminal of the second switching module is grounded, the other ends of the first boost inductor and the second boost inductor are both connected to the input terminal of the resonant module 104, the output terminal 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, the output terminal of the filter module is connected to the load 108, and the load 108 is connected to the circuit output terminal.

[0032] Figure 1 The circuit configuration of this invention is shown, representing a first implementation with bipolar input. The resonant module 104 includes a capacitor C. Lr Capacitor C Ur and inductor L r The transformer module 105 includes a transformer T r and excitation inductance L mThe rectifier module 106 includes field-effect transistors SR1, SR2, SR3, and SR4; the output filter module 107 includes capacitor C0; and the DC power supply V... in The positive terminal of 101 is connected to the first boost inductor L U One end is connected to the first boost inductor L U The other end is connected to the input terminal of the first switch module, and the output terminal of the first switch module is grounded. The DC power supply V in The negative terminal of 101 is connected to the second boost inductor L L One end is connected to the second boost inductor L L The other end is connected to the input terminal of the second switching module, and the output terminal of the second switching module is grounded. The first boost inductor L U The other end is connected to the capacitor C Ur One end of the capacitor C is connected to the capacitor C. Ur 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 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 capacitor C Lr One end of the capacitor C is connected to the capacitor C. Lr The other end is connected to the second boost inductor L L The other end is connected to 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 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. This embodiment can meet the requirements of bipolar input applications with a neutral point by splitting the capacitor in the resonant module 104 into two, thereby reducing the insulation strength between the windings of the transformer module 105.

[0033] Figure 2 An embodiment with bipolar input and tri-isolated output is shown, wherein the resonant module 104 includes a capacitor C. Lr Capacitor C Ur Capacitor C ULr Capacitor C LLr Inductor L r Inductor L ULr and inductor L LLr The transformer module 105 includes a transformer T r Transformer T UL Transformer T LL Magnetizing inductance L ULm Magnetizing inductance L LLm and excitation inductance L m The rectifier module 106 includes field-effect transistors SR1, SR2, SR3, SR4, and SR5. U1 SR Field-Effect Transistor U2 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 load 108 includes load R Ld Load R Ld_U and load R Ld_L The DC power supply V in The positive terminal of 101 is connected to the first boost inductor L U One end is connected to the first boost inductor L U The other end is connected to the input terminal of the first switch module, and the output terminal of the first switch module is grounded. The DC power supply V in The negative terminal of 101 is connected to the second boost inductor L L One end is connected to the second boost inductor L L The other end is connected to the input terminal of the second switch module, and the output terminal of the second switch module is grounded. The capacitor C ULr One end is connected to the first boost inductor L U The other end is connected to the capacitor 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 of the transformer T is connected. UL The other end of the primary winding is grounded, and the excitation inductor L ULm Located at the transformer TUL Within the primary winding, the capacitor C LLr One end is connected to the second boost inductor L L The other end is connected to the capacitor C. LLr The other end is connected to the inductor L LLr One end is connected, the inductor L LLr The other end is connected to the transformer T LL One end of the primary winding of the transformer T is connected. LL The other end of the primary winding is grounded, and the excitation inductor L LLm Located at the transformer T LL Within the primary winding, the capacitor C Ur One end is connected to the first boost inductor L U The other end is connected to the capacitor C. Ur 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 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 capacitor C Lr One end is connected to the excitation inductor L m Located at the transformer T r Within the primary winding, the capacitor C Lr The other end is connected to the second boost inductor L L The other end is connected to 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, and the transformer T UL One end of the secondary winding is connected to the field-effect transistor SR U1 The source connection of the field-effect transistor SR U1 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 012One 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 field-effect transistor SR U2 The source connection of the field-effect transistor SR U2 The drain of the field-effect transistor SR U1 The source connection of the capacitor C 011 One end is connected to the load R Ld_U One end is connected, the load R Ld_U The other end is connected to the capacitor C 012 The other end is connected to the transformer T. LL 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 LL 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 of 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. This embodiment can form a circuit with multi-channel isolated output capability, which can simultaneously control the output of multiple transformer modules 105. At the same time, the transformer modules 105 can be removed or replaced to form different isolated output circuits to meet the needs of other applications.

[0034] Figure 3 A second implementation with bipolar input is shown, wherein 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, SR2, SR3, and SR4; the output filter module 107 includes capacitor C0; and the DC power supply V... inThe positive terminal of 101 is connected to the input terminal of the first switching module, and the output terminal of the first switching module is connected to the first boost inductor L. U1 One end is connected to the first boost inductor L U1 The other end is grounded, and the DC power supply V in The negative terminal of 101 is connected to the input terminal of the second switching module, and the output terminal of the second switching module is connected to the second boost inductor L. L1 One end is connected to the second boost inductor L L1 The other end is grounded, and the output terminal of the first switch module 103 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 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 output terminal of the second switching module, 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 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. This embodiment can reduce the DC voltage bias of the capacitor in the resonant module 104 to zero, which is beneficial for capacitor design. In addition, when the resonant module 104 is no longer operating in resonant mode, the capacitor can be omitted, thereby further reducing costs. Furthermore, the first boost inductor and the second boost inductor can be forward-coupled or reverse-coupled.

[0035] Figure 4 A second embodiment with bipolar input and tri-isolated output is shown, wherein the resonant module 104 includes a capacitor C. Lr Capacitor C Ur Capacitor C ULr Capacitor CLLr Inductor L r Inductor L ULr and inductor L LLr The transformer module 105 includes a transformer T r Transformer T UL Transformer T LL Magnetizing inductance L ULm Magnetizing inductance L LLm and excitation inductance L m The rectifier module 106 includes field-effect transistors SR1, SR2, SR3, SR4, and SR5. U1 SR Field-Effect Transistor U2 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 load 108 includes load R Ld Load R Ld_U and load R Ld_L The DC power supply V in The positive terminal of 101 is connected to the input terminal of the first switching module, and the output terminal of the first switching module is connected to the first boost inductor L. U1 One end is connected to the first boost inductor L U1 The other end is grounded, and the DC power supply V in The negative terminal of 101 is connected to the input terminal of the second switching module, and the output terminal of the second switching module is connected to the second boost inductor L. L1 One end is connected to the second boost inductor L L1 The other end of the capacitor C is grounded. ULr One end is connected to the DC power supply V in The positive terminal of 101 is connected, and the capacitor 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 of the transformer T is connected. UL The other end of the primary winding is connected to the first boost inductor L U1 One end is connected to the excitation inductor L ULm Located at the transformer T UL Within the primary winding, the capacitor C LLr One end is connected to the DC power supply V in The negative terminal of 101 is connected, and the capacitor CLLr The other end is connected to the inductor L LLr One end is connected, the inductor L LLr The other end is connected to the transformer T LL One end of the primary winding of the transformer T is connected. LL The other end of the primary winding is connected to the second boost inductor L L1 One end is connected to the excitation inductor L LLm Located at the transformer T LL Within the primary winding, the output terminal of the first switching module is connected to the inductor L. r One end is connected, the inductor L r 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 r One end of the primary winding of the transformer T is connected. LL The other end of the primary winding is connected to the output terminal of the second switching module, 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 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, and the transformer T UL One end of the secondary winding is connected to the field-effect transistor SR U1 The source connection of the field-effect transistor SR U1 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 UL The other end of the secondary winding is connected to the capacitor C. 012 The other end is connected to the field-effect transistor SR U2 The source connection of the field-effect transistor SRU2 The drain of the field-effect transistor SR U1 The source connection of the capacitor C 011 One end is connected to the load R Ld_U One end is connected, the load R Ld_U The other end is connected to the capacitor C 012 The other end is connected to the transformer T. LL 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 LL 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 of 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. This embodiment can form a circuit with multiple isolated output capabilities, thereby meeting the needs of other applications. In addition, the first boost inductor and the second boost inductor can also be forward coupled or reverse coupled, thereby further improving the power density.

[0036] like Figure 5 As shown, the resonant module 104 includes a capacitor C. Lr Capacitor C Ur Inductor L Ur and inductor L Lr The rectifier module 106 includes field-effect transistors SR1, SR2, SR3, and SR4, and the output filter module 107 includes capacitor C. 02 and capacitor C 01 The DC power supply V in The positive terminal of 101 is connected to the input terminal of the first switching module, and the output terminal of the first switching module is connected to the first boost inductor L. U One end is connected to the first boost inductor L U The other end is grounded, and the DC power supply V in The negative terminal of 101 is connected to the input terminal of the second switching module, and the output terminal of the second switching module is connected to the second boost inductor L.L One end is connected to the second boost inductor L L The other end of the capacitor C is grounded. 01 One end of the capacitor C is connected to the input terminal of the first switch module. 01 The other end is connected to the drain of the field-effect transistor SR2, the source of the field-effect transistor SR2 is connected to the drain of the field-effect transistor SR1, and the source of the field-effect transistor SR1 is connected to the capacitor C. 01 One end is connected, and the drain of the field-effect transistor SR1 is connected to the capacitor C. Ur One end of the capacitor C is connected to the capacitor C. Ur The other end is connected to the inductor L Ur One end is connected, the inductor L Ur The other end is connected to the first boost inductor L U One end of the capacitor C is connected to the capacitor C. 02 One end of the capacitor C is connected to the input terminal of the second switch module. 02 The other end is connected to the source of the field-effect transistor SR3, the source of the field-effect transistor SR4 is connected to the drain of the field-effect transistor SR3, and the drain of the field-effect transistor SR4 is connected to the capacitor C. 02 One end is connected, and the drain of the field-effect transistor SR3 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 inductor L Lr One end is connected, the inductor L Lr The other end is connected to the second boost inductor L L One end is connected, with the drain of MOSFET SR2 and the source of MOSFET SR3 serving as the high-voltage output. This embodiment can meet the requirements of bipolar input with a neutral point, connecting two medium- and high-voltage DC buses. Furthermore, the first and second boost inductors can be forward-coupled or reverse-coupled to further improve power density. Alternatively, the transformer can be removed to form a bipolar input.

[0037] like Figure 6 As shown, the resonant module 104 includes a capacitor C. Lr Capacitor C Ur Capacitor C ULr Capacitor C LLr Inductor L r Inductor L ULr and inductor L LLr The rectifier module 106 includes field-effect transistors SR1, SR2, SR3, SR4, and SR5. U1 SR Field-Effect Transistor U2 SR Field-Effect TransistorL1 and field-effect transistor SR L2 The transformer module 105 includes a transformer T UL Transformer T LL Magnetizing inductance L ULm and excitation inductance L LLm The output filter module 107 includes a capacitor C. 02 Capacitor C 01 Capacitor C 011 Capacitor C 012 Capacitor C 021 and capacitor C 022 The DC power supply V in The positive terminal of 101 is connected to the input terminal of the first switching module, and the output terminal of the first switching module is connected to the first boost inductor L. U One end is connected to the first boost inductor L U The other end is grounded, and the DC power supply V in The negative terminal of 101 is connected to the input terminal of the second switching module, and the output terminal of the second switching module is connected to the second boost inductor L. L One end is connected to the second boost inductor L L The other end of the capacitor C is grounded. 01 One end of the capacitor C is connected to the input terminal of the first switch module. 01 The other end is connected to the drain of the field-effect transistor SR2, the source of the field-effect transistor SR2 is connected to the drain of the field-effect transistor SR1, and the source of the field-effect transistor SR1 is connected to the capacitor C. 01 One end is connected, and the drain of the field-effect transistor SR1 is connected to the capacitor C. Ur One end of the capacitor C is connected to the capacitor C. Ur The other end is connected to the inductor L Ur One end is connected, the inductor L Ur The other end is connected to the first boost inductor L U One end of the capacitor C is connected to the capacitor C. 02 One end of the capacitor C is connected to the input terminal of the second switch module. 02 The other end is connected to the source of the field-effect transistor SR3, the source of the field-effect transistor SR4 is connected to the drain of the field-effect transistor SR3, and the drain of the field-effect transistor SR4 is connected to the capacitor C. 02 One end is connected, and the drain of the field-effect transistor SR3 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 inductor L Lr One end is connected, the inductor L Lr The other end is connected to the second boost inductor L LOne end of the capacitor C is connected to the capacitor C. ULr One end is connected to the DC power supply V in The positive terminal of 101 is connected, and the capacitor 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 of the transformer T is connected. UL The other end of the primary winding is connected to the first boost inductor L U One end is connected to the excitation inductor L ULm Located at the transformer T UL Within the primary winding, the capacitor C LLr One end is connected to the DC power supply V in The negative terminal of 101 is connected, and the capacitor C LLr The other end is connected to the inductor L LLr One end is connected, the inductor L LLr The other end is connected to the transformer T LL One end of the primary winding of the transformer T is connected. LL The other end of the primary winding is connected to the second boost inductor L L One end is connected to the excitation inductor L LLm Located at the transformer T LL Within the primary winding of the transformer T UL One end of the secondary winding is connected to the field-effect transistor SR U1 The source connection of the field-effect transistor SR U1 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 UL The other end of the secondary winding is connected to the capacitor C. 012 The other end is connected to the field-effect transistor SR U2 The source connection of the field-effect transistor SR U2 The drain of the field-effect transistor SR U1 The source connection of the capacitor C 011 One end is connected to the load R Ld_U One end is connected, the load R Ld_U The other end is connected to the capacitor C 012 The other end is connected to the transformer T. LL 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 C021 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 LL 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 of 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, with the drain of MOSFET SR2 and the source of MOSFET SR3 serving as the high-voltage output. This embodiment is a implementation with bipolar input, one non-isolated output, and two isolated outputs, which can form a circuit with multiple isolated buck outputs and non-isolated high-voltage output capabilities, thereby meeting the needs of other applications. Furthermore, the first boost inductor and the second boost inductor can also be forward-coupled or reverse-coupled, thereby further improving power density.

[0038] like Figure 7 As shown, the resonant module 104 includes a capacitor C. Lr Capacitor C r Capacitor C Ur Inductor L Ur Inductor L r and inductor L Lr 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, and SR4, and the output filter module 107 includes capacitor C. 02 and capacitor C 01 The DC power supply V in The positive terminal of 101 is connected to the input terminal of the first switching module, and the output terminal of the first switching module is connected to the first boost inductor L. U One end is connected to the first boost inductor L U The other end is grounded, and the DC power supply V in The negative terminal of 101 is connected to the input terminal of the second switching module, and the output terminal of the second switching module is connected to the second boost inductor L. L One end is connected to the second boost inductor L L The other end of the capacitor C is grounded. 01One end of the capacitor C is connected to the input terminal of the first switch module. 01 The other end is connected to the drain of the field-effect transistor SR2, the source of the field-effect transistor SR2 is connected to the drain of the field-effect transistor SR1, and the source of the field-effect transistor SR1 is connected to the capacitor C. 01 One end is connected, and the drain of the field-effect transistor SR1 is connected to the capacitor C. Ur One end of the capacitor C is connected to the capacitor C. Ur The other end is connected to the inductor L Ur One end is connected, the inductor L Ur The other end is connected to the first boost inductor L U One end of the capacitor C is connected to the capacitor C. 02 One end of the capacitor C is connected to the input terminal of the second switch module. 02 The other end is connected to the source of the field-effect transistor SR3, the source of the field-effect transistor SR4 is connected to the drain of the field-effect transistor SR3, and the drain of the field-effect transistor SR4 is connected to the capacitor C. 02 One end is connected, and the drain of the field-effect transistor SR3 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 inductor L Lr One end is connected, the inductor L Lr The other end is connected to the second boost inductor L L One end is connected, the inductor L r One end is connected to the inductor L Ur The other end is connected to 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 inductor L Lr The other end is connected to 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 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. 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 drain of the field-effect transistor SR2 and the source of the field-effect transistor SR3 serve as the high-voltage output. This embodiment is a bipolar input with one non-isolated output and one isolated output. This embodiment can reduce the DC voltage bias of the capacitor in the resonant module 104 in the isolated output branch to zero. Therefore, when the resonant module 104 is not operating in resonant mode, the capacitor can be omitted, thereby further reducing costs. In addition, the first boost inductor and the second boost inductor in the figure can also be forward-coupled or reverse-coupled, thereby further improving the power density.

[0039] The switching module 103 is composed of several switching circuits SM connected in series. In this invention, two switching modules 103 are provided, namely the first switching module and the second switching module. Both the first and second switching modules are composed of switching circuits SM connected in series. The switching circuits SM adopt 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, a second half-bridge switch Q2, and a third half-bridge switch Q2. 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 22The 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. For example... Figure 8-10 As shown, the switching module 103 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.

[0040] Figure 11 and Figure 12 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 11 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.

[0041] In this embodiment, the transformer module 105 can be a transformer consisting of two windings, or it can be as follows: Figure 12 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.

[0042] 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 12As 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.

[0043] In an embodiment, the output filter module 107 may be composed of a capacitor or an LC filter consisting of an inductor-capacitor.

[0044] 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.

[0045] like Figure 13 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 1-7 The modular DC transformer 100 of any embodiment can be combined to form a circuit for processing high-power power supplies.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bipolar input DC transformer, characterized by A direct current power supply V in , a boost inductor module, a switch module, a resonance module, a transformer module, a rectifier module and an output filter module, an output end of the direct current power supply V in is connected with an input end of the boost inductor module, an output end of the boost inductor module is connected with an input end of the switch module, an output end of the switch module is grounded, the boost inductor module comprises a first boost inductor and a second boost inductor, the switch module comprises a first switch module and a second switch module, a positive pole of the direct current power supply V in is connected with one end of the first boost inductor, the other end of the first boost inductor is connected with an input end of the first switch module, an output end of the first switch module is grounded, a negative pole of the direct current power supply V in is connected with one end of the second boost inductor, the other end of the second boost inductor is connected with an input end of the second switch module, an output end of the second switch module is grounded, the other end of the first boost inductor and the other end of the second boost inductor are both connected with an input end of the resonance module, an output end of the resonance module is connected with an input end of the transformer module, an output end of the transformer module is connected with an input end of the rectifier module, an output end of the rectifier module is connected with an input end of the output filter module, an output end of the output filter module is connected with a load, and the load is connected with a circuit output end.

2. A bipolar input DC transformer as claimed in claim 1, characterized in that The resonance module includes a capacitor C Lr , a capacitor C Ur , and an inductor L r , the transformer module includes a transformer T r and an excitation inductor L m , the rectifier module includes field effect transistors SR1, SR2, SR3, and SR4, the output filter module includes a capacitor C0, a positive electrode of the DC power supply V in is connected to one end of the first boost inductor L U , the other end of the first boost inductor L U is connected to the input end of the first switch module, the output end of the first switch module is grounded, a negative electrode of the DC power supply V in is connected to one end of the second boost inductor L L , the other end of the second boost inductor L L is connected to the input end of the second switch module, the output end of the second switch module is grounded, the other end of the first boost inductor L U is connected to one end of the capacitor C Ur , the other end of the capacitor C Ur is connected to one end of the inductor L r , the other end of the inductor L r is connected to one end of the primary winding of the transformer T r , the other end of the primary winding of the transformer T r is connected to one end of the capacitor C Lr , the other end of the capacitor C Lr is connected to the other end of the second boost inductor L L , the excitation inductor L m is arranged in the primary winding of the transformer T r , one end of the secondary winding of the transformer T r 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, the other end of the secondary winding of the transformer T r 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 one end of the load R Ld , the other end of the load R Ld is connected to the other end of the capacitor C0.

3. A bipolar input DC transformer as claimed in claim 1, wherein, The resonance module includes a capacitor C Lr , a capacitor C Ur , a capacitor C ULr , a capacitor C LLr , an inductor L r , an inductor L ULr , and an inductor L LLr The transformer module includes a transformer T r , a transformer T UL , a transformer T LL , an excitation inductor L ULm , an excitation inductor L LLm , and an excitation inductor L m The rectifier module includes a field effect transistor SR1, a field effect transistor SR2, a field effect transistor SR3, a field effect transistor SR4, a field effect transistor SR U1 , a field effect transistor SR U2 , a field effect transistor SR L1 , and a field effect transistor SR L2 The output filter module includes a capacitor C0, a capacitor C 011 , a capacitor C 012 , a capacitor C 021 , and a capacitor C 022 The load includes a load R Ld , a load R Ld_U , and a load R Ld_L The positive pole of the direct current power supply V in is connected with one end of the first boost inductor L U , the other end of the first boost inductor L U is connected with the input end of the first switch module, the output end of the first switch module is grounded, the negative pole of the direct current power supply V in is connected with one end of the second boost inductor L L , the other end of the second boost inductor L L is connected with the input end of the second switch module, the output end of the second switch module is grounded, one end of the capacitor C ULr is connected with the other end of the first boost inductor L U , the other end of the capacitor C ULr is connected with one end of the inductor L ULr , the other end of the inductor L ULr is connected with one end of the primary winding of the transformer T UL , the other end of the primary winding of the transformer T UL is grounded, the excitation inductor L ULm is arranged in the primary winding of the transformer T UL , one end of the capacitor C LLr is connected with the other end of the second boost inductor L L the other end of the capacitor C LLr is connected to one end of the inductor L LLr , the other end of the inductor L LLr is connected to one end of the primary winding of the transformer T LL , the other end of the primary winding of the transformer T LL is grounded, the field inductor L LLm is arranged in the primary winding of the transformer T LL , one end of the capacitor C Ur is connected to the other end of the first step-up inductor L U , the other end of the capacitor C Ur is connected to one end of the inductor L r , the other end of the inductor L r is connected to one end of the primary winding of the transformer T r , the other end of the primary winding of the transformer T r is connected to one end of the capacitor C Lr , the field inductor L m is arranged in the primary winding of the transformer T r , the other end of the capacitor C Lr is connected to the other end of the second step-up inductor L L , one end of the secondary winding of the transformer T r 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, the other end of the secondary winding of the transformer T r is connected to the drain of the field effect transistor SR4, one end of the capacitor CO is connected to the drain of the field effect transistor SR3, the other end of the capacitor CO is connected to the source of the field effect transistor SR4, one end of the capacitor CO is connected to one end of the load R Ld , the other end of the load R Ld is connected to the other end of the capacitor CO, one end of the secondary winding of the transformer T UL is connected to the source of the field effect transistor SR U1 , the drain of the field effect transistor SR U1 is connected to one end of the capacitor C 011 , the other end of the capacitor C 011 is connected to one end of the capacitor C 012 , the other end of the capacitor C 011 is connected to one end of the primary winding of 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 field-effect transistor SR U2 The source connection of the field-effect transistor SR U2 The drain of the field-effect transistor SR U1 The source connection, the capacitor C 011 One end is connected to the load R Ld_U One end is connected, the load R Ld_U The other end is connected to the capacitor C 012 The other end is connected to the transformer T. LL 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 LL 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 of 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.

4. A bipolar input DC transformer as claimed in claim 1, wherein, The resonance module comprises a capacitor C r and an inductor L r The transformer module comprises a transformer T r and an excitation inductor L m The rectifier module comprises a field effect transistor SR1, a field effect transistor SR2, a field effect transistor SR3 and a field effect transistor SR4, the output filter module comprises a capacitor C0, the positive pole of the DC power supply V in is connected with the input end of the first switch module, the output end of the first switch module is connected with one end of the first boost inductor L U1 , the other end of the first boost inductor L U1 is grounded, the negative pole of the DC power supply V in is connected with the input end of the second switch module, the output end of the second switch module is connected with one end of the second boost inductor L L1 , the other end of the second boost inductor L L1 is grounded, the output end of the first switch module is connected with one end of the inductor L r , the other end of the inductor L r is connected with one end of the capacitor C r , the other end of the capacitor C r is connected with one end of the primary winding of the transformer T r , the other end of the primary winding of the transformer T r is connected with the output end of the second switch module, the excitation inductor L m is arranged in the primary winding of the transformer T r , one end of the secondary winding of the transformer T r is connected with the source of the field effect transistor SR1, the drain of the field effect transistor SR1 is connected with the drain of the field effect transistor SR3, the source of the field effect transistor SR3 is connected with the drain of the field effect transistor SR4, the source of the field effect transistor SR4 is connected with the source of the field effect transistor SR2, the drain of the field effect transistor SR2 is connected with the source of the field effect transistor SR1, the other end of the secondary winding of the transformer T r is connected with the drain of the field effect transistor SR4, the drain of the field effect transistor SR3 is connected with one end of the capacitor C0, the other end of the capacitor C0 is connected with the source of the field effect transistor SR4, one end of the capacitor C0 is connected with one end of the load R Ld , the other end of the load R Ld is connected with the other end of the capacitor C0.

5. A bipolar input DC transformer as claimed in claim 1, wherein, The resonance module includes a capacitor C Lr , a capacitor C Ur , a capacitor C ULr , a capacitor C LLr , an inductor L r , an inductor L ULr , and an inductor L LLr The transformer module includes a transformer T r , a transformer T UL , a transformer T LL , an excitation inductor L ULm , an excitation inductor L LLm , and an excitation inductor L m The rectifier module includes a field effect tube SR1, a field effect tube SR2, a field effect tube SR3, a field effect tube SR4, a field effect tube SR U1 , a field effect tube SR U2 , a field effect tube SR L1 , and a field effect tube SR L2 The output filter module includes a capacitor C0, a capacitor C 011 , a capacitor C 012 , a capacitor C 021 , and a capacitor C 022 The load includes a load R Ld , a load R Ld_U , and a load R Ld_L The positive pole of the direct current power supply V in is connected with the input end of the first switch module, the output end of the first switch module is connected with one end of the first boost inductor L U1 , the other end of the first boost inductor L U1 is grounded, the negative pole of the direct current power supply V in is connected with the input end of the second switch module, the output end of the second switch module is connected with one end of the second boost inductor L L1 , the other end of the second boost inductor L L1 is grounded, one end of the capacitor C ULr is connected with the positive pole of the direct current power supply V in , the other end of the capacitor C ULr is connected with one end of the inductor L ULr , the other end of the inductor L ULr is connected with one end of the primary winding of the transformer T UL , the other end of the primary winding of the transformer T UL is connected with one end of the first boost inductor L U1 , the excitation inductor L ULm is arranged in the primary winding of the transformer T UL , the other end of the capacitor C LLr one end of the capacitor C in is connected with the negative pole of the direct current power supply V LLr , the other end of the capacitor C LLr is connected with one end of the inductor L LLr , the other end of the inductor L LL is connected with one end of the primary winding of the transformer T LL , the other end of the primary winding of the transformer T L1 is connected with one end of the second boost inductor L LLm , the excitation inductor L LL is arranged in the primary winding of the transformer T r , one end of the inductor L r is connected with the output end of the first switch module, the other end of the inductor L Lr is connected with one end of the capacitor C Lr , the other end of the capacitor C r is connected with one end of the primary winding of the transformer T LL , the other end of the primary winding of the transformer T m is connected with the output end of the second switch module, the excitation inductor L r is arranged in the primary winding of the transformer T r , one end of the secondary winding of the transformer T r is connected with the source of the field effect transistor SR1, the drain of the field effect transistor SR1 is connected with the drain of the field effect transistor SR3, the source of the field effect transistor SR3 is connected with the drain of the field effect transistor SR4, the source of the field effect transistor SR4 is connected with the source of the field effect transistor SR2, the drain of the field effect transistor SR2 is connected with the source of the field effect transistor SR1, the other end of the secondary winding of the transformer T Ld is connected with the drain of the field effect transistor SR4, the drain of the field effect transistor SR3 is connected with one end of the capacitor C0, the other end of the capacitor C0 is connected with the source of the field effect transistor SR4, one end of the capacitor C0 is connected with one end of the load R Ld , the other end of the load R UL is connected with the other end of the capacitor C0, one end of the secondary winding of the transformer T U1 is connected with the source of the field effect transistor SR U1 , the drain of the field effect transistor SR 011 is connected with one end of the capacitor C 011 , the other end of the capacitor C 012 is connected with one end of the capacitor C 011 , the other end of the capacitor C UL is connected with the other end of the secondary winding of the transformer T 012 the other end of said field effect transistor SR U2 is connected to the source of said field effect transistor SR U2 , the drain of said field effect transistor SR U1 is connected to the source of said capacitor C 011 , one end of said load R Ld_U is connected to one end of said capacitor C Ld_U , the other end of said load R 012 is connected to the other end of said capacitor C LL , one end of the secondary winding of said transformer T L1 is connected to the source of said field effect transistor SR L1 , the drain of said field effect transistor SR 021 is connected to one end of said capacitor C 021 , the other end of said capacitor C 022 is connected to one end of said capacitor C 021 , the other end of said capacitor C LL is connected to the other end of the secondary winding of said transformer T 022 , one end of said capacitor C L2 is connected to the source of said field effect transistor SR L2 , the drain of said field effect transistor SR L1 is connected to the source of said capacitor C 021 , one end of said load R Ld_L is connected to one end of said capacitor C Ld_L , the other end of said load R 022 is connected to the other end of said capacitor C 6. A bipolar input DC transformer as claimed in claim 1, wherein, The resonance module includes a capacitor C Lr , a capacitor C Ur , an inductor L Ur , and an inductor L Lr The rectifier module includes a field effect transistor SR1, a field effect transistor SR2, a field effect transistor SR3, and a field effect transistor SR4, the output filter module includes a capacitor C 02 , and a capacitor C 01 The positive pole of the DC power supply V in is connected to the input end of the first switch module, the output end of the first switch module is connected to one end of the first boost inductor L U , the other end of the first boost inductor L U is grounded, the negative pole of the DC power supply V in is connected to the input end of the second switch module, the output end of the second switch module is connected to one end of the second boost inductor L L , the other end of the second boost inductor L L is grounded, one end of the capacitor C 01 is connected to the input end of the first switch module, the other end of the capacitor C 01 is connected to the drain of the field effect transistor SR2, the source of the field effect transistor SR2 is connected to the drain of the field effect transistor SR1, the source of the field effect transistor SR1 is connected to one end of the capacitor C 01 , the drain of the field effect transistor SR1 is connected to one end of the capacitor C Ur , the other end of the capacitor C Ur is connected to one end of the inductor L Ur , the other end of the inductor L Ur is connected to one end of the first boost inductor L U , one end of the capacitor C 02 is connected to the input end of the second switch module, the other end of the capacitor C 02 is connected to the source of the field effect transistor SR3, the source of the field effect transistor SR4 is connected to the drain of the field effect transistor SR3, the drain of the field effect transistor SR4 is connected to one end of the capacitor C 02 , the drain of the field effect transistor SR3 is connected to one end of the capacitor C Lr , the other end of the capacitor C Lr is connected to one end of the inductor L Lr , the other end of the inductor L Lr is connected to one end of the second boost inductor L L , and the drain of the field effect transistor SR2 and the source of the field effect transistor SR3 are used as high-voltage output ends.

7. A bipolar input DC transformer as claimed in claim 1, wherein, The resonance module includes a capacitor C Lr , a capacitor C Ur , a capacitor C ULr , a capacitor C LLr , an inductor L r , an inductor L ULr , and an inductor L LLr The rectifier module includes a field effect transistor SR1, a field effect transistor SR2, a field effect transistor SR3, a field effect transistor SR4, a field effect transistor SR U1 , a field effect transistor SR U2 , a field effect transistor SR L1 , and a field effect transistor SR L2 The transformer module includes a transformer T UL , a transformer T LL , an excitation inductor L ULm , and an excitation inductor L LLm The output filter module includes a capacitor C 02 , a capacitor C 01 , a capacitor C 011 , a capacitor C 012 , a capacitor C 021 , and a capacitor C 022 The positive pole of the DC power supply V in is connected with the input end of the first switch module, the output end of the first switch module is connected with one end of the first boost inductor L U , the other end of the first boost inductor L U is grounded, the negative pole of the DC power supply V in is connected with the input end of the second switch module, the output end of the second switch module is connected with one end of the second boost inductor L L , the other end of the second boost inductor L L is grounded, one end of the capacitor C 01 is connected with the input end of the first switch module, the other end of the capacitor C 01 is connected with the drain of the field effect transistor SR2, the source of the field effect transistor SR2 is connected with the drain of the field effect transistor SR1, the source of the field effect transistor SR1 is connected with one end of the capacitor C 01 , the drain of the field effect transistor SR1 is connected with one end of the capacitor C Ur , the other end of the capacitor C Ur is connected with one end of the inductor L Ur , the other end of the inductor L Ur is connected with one end of the first boost inductor L U , one end of the capacitor C 02 is connected with the input end of the second switch module, the other end of the capacitor C 02 The other end is connected to the source of the field-effect transistor SR3, the source of the field-effect transistor SR4 is connected to the drain of the field-effect transistor SR3, and the drain of the field-effect transistor SR4 is connected to the capacitor C. 02 One end is connected, and the drain of the field-effect transistor SR3 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 inductor L Lr One end is connected, the inductor L Lr The other end is connected to the second boost inductor L L One end of the capacitor C is connected to the capacitor C. ULr One end is connected to the DC power supply V in The positive terminal of the capacitor C is connected. 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 of the transformer T is connected. UL The other end of the primary winding is connected to the first boost inductor L U One end is connected to the excitation inductor L ULm Located at the transformer T UL Within the primary winding, the capacitor C LLr One end is connected to the DC power supply V in The negative terminal of the capacitor C is connected. LLr The other end is connected to the inductor L LLr One end is connected, the inductor L LLr The other end is connected to the transformer T LL One end of the primary winding of the transformer T is connected. LL The other end of the primary winding is connected to the second boost inductor L L One end is connected to the excitation inductor L LLm Assuming the transformer T LL Within the primary winding of the transformer T UL One end of the secondary winding is connected to the field-effect transistor SR U1 The source connection of the field-effect transistor SR U1 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 UL The other end of the secondary winding is connected to the capacitor C. 012 The other end is connected to the field-effect transistor SR U2 The source connection of the field-effect transistor SR U2 drain of the field effect transistor SR U1 is connected to one end of the capacitor C 011 , one end of the load R Ld_U is connected to one end of the capacitor C Ld_U , the other end of the load R 012 is connected to the other end of the capacitor C LL , one end of the secondary winding of the transformer T L1 is connected to the source of the field effect transistor SR L1 , the drain of the field effect transistor SR 021 is connected to one end of the capacitor C 021 , the other end of the capacitor C 022 is connected to one end of the capacitor C 021 , the other end of the capacitor C LL is connected to the other end of the secondary winding of the transformer T 022 , the other end of the capacitor C L2 is connected to the source of the field effect transistor SR L2 , the drain of the field effect transistor SR L1 is connected to the source of the field effect transistor SR 021 , one end of the load R Ld_L is connected to one end of the capacitor C Ld_L , the other end of the load R 022 is connected to the other end of the capacitor C , the drain of the field effect transistor SR2 and the source of the field effect transistor SR3 are output as high voltage ends.

8. A bipolar input DC transformer as claimed in claim 1, wherein, The resonance module includes a capacitor C Lr , a capacitor C r , a capacitor C Ur , an inductor L Ur , an inductor L r , and an inductor L Lr The transformer module includes a transformer T r , and an excitation inductor L m The rectifier module includes a field effect transistor SR1, a field effect transistor SR2, a field effect transistor SR3, and a field effect transistor SR4 02 , a capacitor C 01 The positive pole of the DC power supply V in is connected with the input end of the first switch module, the output end of the first switch module is connected with one end of the first boost inductor L U , the other end of the first boost inductor L U is grounded, the negative pole of the DC power supply V in is connected with the input end of the second switch module, the output end of the second switch module is connected with one end of the second boost inductor L L , the other end of the second boost inductor L L is grounded, one end of the capacitor C 01 is connected with the input end of the first switch module, the other end of the capacitor C 01 is connected with the drain of the field effect transistor SR2, the source of the field effect transistor SR2 is connected with the drain of the field effect transistor SR1, the source of the field effect transistor SR1 is connected with one end of the capacitor C 01 , the drain of the field effect transistor SR1 is connected with one end of the capacitor C Ur , the other end of the capacitor C Ur is connected with one end of the inductor L Ur , the other end of the inductor L Ur is connected with one end of the first boost inductor L U , one end of the capacitor C 02 is connected with the input end of the second switch module, the other end of the capacitor C 02 is connected with the source of the field effect transistor SR3, the source of the field effect transistor SR4 is connected with the drain of the field effect transistor SR3, the drain of the field effect transistor SR4 is connected with one end of the capacitor C 02 , the drain of the field effect transistor SR3 is connected with one end of the capacitor C Lr , the other end of the capacitor C Lr is connected with one end of the inductor L Lr , the other end of the inductor L Lr is connected with the second boost inductor L L One end is connected, the inductor L r One end is connected to the inductor L Ur The other end is connected to 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 inductor L Lr The other end is connected to the excitation inductor L m Assuming the transformer T r Within the primary winding of 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, and the drain of the field-effect transistor SR2 and the source of the field-effect transistor SR3 are used as high-voltage outputs.

9. A bipolar input DC transformer according to any one of claims 1-8, characterized in that The switch module is composed of several switch circuits SM in series, the switch circuit SM adopts 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 tube Q1, a field effect tube Q2 and a capacitor C1, the drain electrode of the field effect tube Q1 is connected with one end of the capacitor C1, the other end of the capacitor C1 is connected with the source electrode of the field effect tube Q2, the drain electrode of the field effect tube Q2 is connected with the source electrode of the field effect tube Q1, and the source electrode and the drain electrode of the field effect tube Q2 are output; the second half-bridge switch includes a field effect tube Q 11 , a field effect tube Q 21 and a capacitor C2, the drain electrode of the field effect tube Q 11 is connected with one end of the capacitor C2, the other end of the capacitor C2 is connected with the source electrode of the field effect tube Q 21 , the drain electrode of the field effect tube Q 21 is connected with the source electrode of the field effect tube Q 11 , and the source electrode and the drain electrode of the field effect tube Q 11 are output; the full-bridge switch includes a field effect tube Q 12 , a field effect tube Q 22 , a field effect tube Q3, a field effect tube Q4 and a capacitor C3, the drain electrode of the field effect tube Q 12 is connected with the drain electrode of the field effect tube Q3, the source electrode of the field effect tube Q 12 is connected with the drain electrode of the field effect tube Q 22 , the source electrode of the field effect tube Q 22 is connected with the source electrode of the field effect tube Q4, the source electrode of the field effect tube Q3 is connected with the drain electrode of the field effect tube Q4, one end of the capacitor C3 is connected with the drain electrode of the field effect tube Q 12 , the other end of the capacitor C3 is connected with the source electrode of the field effect tube Q 22 , and the source electrode of the field effect tube Q 12 is connected with the source electrode of the field effect tube Q3.

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