​We are looking for an SST (Solid-State Transformer) R&D Engineer to join a leading renewable energy company, focusing on full-cycle R&D of medium/high-voltage solid-state transformers (Power Electronic Transformers, PET). The role covers topology design, wide-bandgap device application, high-frequency magnetic component development, high-voltage insulation optimization, system control and reliability verification, supporting the technical iteration and industrialization of smart grids and energy router systems.

This position involves interdisciplinary R&D in wide-bandgap semiconductors, high-frequency power electronics, magnetic engineering, high-voltage insulation and digital control, aiming to solve key technical challenges for high-efficiency, high-power-density and high-reliability SST equipment.

Research Area

Power Semiconductor Device & Packaging R&D

• Select, verify and optimize SiC/GaN wide-bandgap devices for 10kV/35kV SST applications; conduct research on switching loss optimization, short-circuit tolerance and CMTI performance improvement.

• Develop and optimize medium/high-voltage power module packaging, including AMB/Si₃N₄ substrates, silver sintering processes, low-inductance busbars and module partial discharge suppression technologies.

• Complete device and module reliability validation, including power cycling, thermal shock and thermomechanical fatigue tests.

• Design high-voltage isolated drive circuits, active clamping and dv/dt suppression schemes to ensure reliable device operation.

SST Topology Architecture Research & Design

• Research and optimize mainstream three-stage SST topologies, including CHB/MMC/Vienna rectifiers, DAB/LLC/CLLC resonant DC-DC converters and grid-tied inverters.

• Explore advanced simplified topologies (single-stage/two-stage) and hybrid SST (HSST) structures combining power-frequency transformers and power electronic units.

• Develop multi-port SST energy router topologies and control strategies for integrated PV, energy storage and grid-connected power access, realizing multi-port power decoupling and dynamic energy routing.

• Optimize modular series-parallel architectures to achieve unit voltage/power balancing and fault-bypass redundant control.

High-Frequency Magnetic Component (MFT) R&D

• Research and select amorphous, nanocrystalline and ferrite magnetic materials; establish high-frequency loss models and analyze DC-biased loss characteristics.

• Design high-frequency Litz wire windings, optimize parasitic capacitance and leakage inductance for low-parasitic high-frequency transformer (MFT) design.

• Optimize MFT manufacturing processes (VPI, epoxy casting) to improve PDIV and high-dv/dt partial discharge resistance.

• Study magnetic integration technologies to realize lightweight design and power density enhancement of magnetic components.

Insulation System & System Optimization

• Research high-frequency high-voltage composite insulation materials (nano-composite epoxy, PI film, bio-based insulating oil) to suppress partial discharge and electrical aging under high-dv/dt conditions.

• Conduct electric field simulation, optimize equalizing and shielding structures, and complete overall insulation coordination for medium/high-voltage SST equipment.

Test Verification & Technical Documentation

• Build SST test platforms and complete prototype debugging, performance testing and reliability verification.

• Organize R&D data, compile technical reports and patents, and support project implementation and industrialization.

Job Requirements (Qualified in any relevant Research Field)

• Education Background: PhD required, with a primary focus on silicon carbide; candidates specializing in electrical engineering or power transmission & distribution are also acceptable. Both fresh graduates and experienced R&D personnel are welcome.

• Candidates with professional experience or expertise in ANY ONE SST sub-field are qualified (no full-field experience required).

Eligible research directions are listed below:

• Wide-bandgap Semiconductors & Packaging: SiC/GaN device application, power module packaging, drive circuit design and reliability testing.

• SST Topology & Control Algorithm: Multilevel converters, DAB/LLC resonant converters, multi-port energy router topology and closed-loop control design.

• High-Frequency Magnetic Components (MFT): High-frequency transformer design, magnetic material selection, parasitic optimization and magnetic integration technology.

• High-Voltage Insulation & Dielectric Materials: High-frequency high-voltage insulation design, partial discharge suppression, electric field simulation and new insulation material research.

• System Testing & Reliability: Prototype debugging, performance testing and reliability verification of medium/high-voltage power electronic systems.

• Professional Skills: Proficient in simulation tools (MATLAB/Simulink, PLECS, ANSYS) corresponding to your research direction; capable of independent technical development and verification.

• Comprehensive Competencies: Good literature research, problem-solving and team collaboration capabilities.

• Language Requirement: Basic English reading and technical writing skills; no oral English requirement.

• Preferred Qualifications: Candidates with SCI/EI papers, invention patents, vertical project experience or medium/high-voltage prototype development experience are prioritized.

Salary & Benefits

• Competitive salary + year-end & project performance bonuses, matched with personal experience and academic background.

• Complete benefits package: full social insurance & housing fund, annual leave, regular physical examination and talent subsidies.

• Professional R&D platform: university and research institute cooperation, supporting academic research and patent application.

• Dual promotion paths for technical experts and management, with clear career growth routes.