Sun.King Power Electronics & Energy Systems

Corporate Structure and Production Facilities of Sun.King Group

Sun.King Technology Group Co., Ltd. (HKEX: 0580.HK) is a preeminent Chinese power electronics and transmission engineering manufacturer established in 2002.

The group integrates multiple specialized industrial enterprises: SwissSEM Semiconductor (IGBT and SiC semiconductor chip design and packaging), Wuxi Sunking and Jiashan Sunking (power electronic and transmission capacitors), Zhejiang Sine Power (laminated busbars and integrated battery CCS), Astrol

Electronic AG (Switzerland, solid-state DC switchgear), Wuhan LandPower (substation online monitoring), and Jiashan Keneng (FACTS systems and saturable anode reactors).

The group's modern manufacturing facilities hold ISO 9001, ISO 14001, ISO 45001, IRIS railway certification (ISO/TS 22163), and automotive IATF 16949 credentials.

Sun.King power products operate reliably across more than 40 Chinese Ultra-High Voltage DC (UHVDC) transmission lines, Fuxing high-speed train traction systems, offshore wind farms, and maritime propulsion plants.

SwissSEM Advanced Power Semiconductor Technologies

SwissSEM specializes in proprietary generation-7 i23 IGBT chips featuring thin-wafer Field Stop Trench cell topology.

With optimized carrier concentration profiles, these chips achieve a remarkably low collector-emitter saturation voltage Vce(sat) alongside reduced diode reverse recovery charge, lowering total converter switching and conduction losses by up to 15% compared with earlier architectures.

The 1200V silicon carbide SiC MOSFET dies deliver ultra-low specific on-state resistance Rds(on) paired with exceptional gate oxide thermal stability.

SwissSEM modules are packaged in industry-standard ED (EconoDual) and EP (EasyPack) housings, as well as automotive HEEV packages with direct pin-fin liquid cooling bases designed to withstand harsh thermal cycling in electric vehicle traction inverters.

Wuxi and Jiashan Sunking Capacitor Engineering

Operating under Sun.King Capacitors, Wuxi and Jiashan facilities engineer metallized polypropylene DC-Link capacitors and high-voltage transmission capacitor banks.

DC-Link units integrate segmented metallized film patterns that provide localized self-healing capability, isolating micro-breakdowns without complete component failure.

Constructed inside flame-retardant metal or reinforced plastic enclosures filled with dry epoxy or polyurethane resins, these capacitors provide leak-free operation and high mechanical shock resistance up to 5g on rail vehicles.

For 6–500 kV AC utility substations, Sun.King produces high-voltage shunt capacitor units impregnated with biodegradable non-PCB synthetic fluids, delivering minimal dielectric dissipation factors.

Sine Power Low-Inductance Laminated Busbars

Engineered by Zhejiang Sine Power, laminated busbars consist of parallel high-conductivity copper or aluminum conductor plates interleaved with high-dielectric polyimide (Kapton/Nomex) insulation films.

By minimizing distance between positive and negative conductors, the opposing magnetic fields largely cancel each other, reducing overall parasitic inductance to single-digit nanohenries.

This low stray inductance suppresses critical voltage spikes on semiconductor terminals during rapid switching transients with steep di/dt slopes. As a result, power inverters can run at higher switching frequencies with lower snubber losses and enhanced overall efficiency.

Battery Cells Contact Systems (CCS)

Sine Power Cells Contact Systems integrate cell interconnection tabs, voltage sensing lines, NTC temperature sensors, and dielectric carriers into an automated plug-and-play assembly.

Available in Semi-film, Full-film, and thermoformed Blister architectures, these systems suit prismatic battery cells across electric vehicles and grid energy storage systems (ESS).

Integrated flexible printed circuit (FPC) or flexible flat cable (FFC) harnesses provide accurate real-time telemetry to the Battery Management System (BMS).

Interconnect tabs utilize copper-aluminum clad composites or nickel-plated copper, ensuring robust, low-resistance laser or ultrasonic welding to cell battery terminals.

Astrol Solid-State DC Circuit Breakers (SSDCB)

In high-voltage DC networks, the lack of a natural current zero-crossing makes clearing short-circuit faults with mechanical contacts extremely difficult and arc-intensive.

Solid-State DC Circuit Breakers engineered by Swiss subsidiary Astrol Electronic AG interrupt fault currents within 5 to 10 microseconds using semiconductor power devices.

Parallel metal-oxide varistor (MOV) snubber networks absorb inductive line energy without drawing an open electric arc.

Astrol DC breakers hold DNV maritime type approval for hybrid and electric vessels and are increasingly specified in AI data center (AIDC) DC distribution architectures requiring continuous power integrity.

LandPower Substation Diagnostic Solutions

Wuhan LandPower manufactures comprehensive instrumentation for continuous online condition monitoring of 10–500 kV utility substations.

The GOM5011 opto-acoustic arc flash protection system uses optical sensor heads and flexible fiber lines to detect switchgear internal arc flashes within 1 millisecond, triggering fast breaker tripping.

For Gas-Insulated Switchgear (GIS), GOM5012 UHF partial discharge sensors cover bandwidths up to 1.5 GHz, utilizing pattern recognition algorithms to filter out external corona and ambient electromagnetic noise.

In addition, OSF3091 non-dispersive infrared (NDIR) sensors provide continuous in-situ monitoring of SF6 gas density and micro-moisture content without gas sampling.

Keneng FACTS Equipment and Saturable Anode Reactors

Flexible AC Transmission Systems (FACTS) from Jiashan Keneng comprise Thyristor-Controlled Reactor (TCR) Static Var Compensators (SVC) and IGBT-based Static Var Generators (SVG).

These systems provide sub-cycle dynamic reactive power compensation, mitigating voltage fluctuations and flicker caused by electric arc furnaces and heavy industrial loads.

The ETT and LTT series saturable anode reactors are installed in series with thyristor levels in HVDC converter valves.

The non-linear magnetic core provides high initial inductance during thyristor turn-on, limiting the rate of current rise (di/dt) until charge carriers fully disperse across the semiconductor silicon area, then saturates quickly to minimize forward conduction losses.

Receiving Inspection and Component Verification

Upon delivery of Sun.King semiconductors, capacitors, or monitoring devices, incoming quality inspection should verify package seals, QR code traceability, serial numbers against factory test certificates, and physical integrity of ceramic or polymeric insulating housings.

For SwissSEM modules, verify terminal-to-baseplate insulation resistance, diode forward voltage drop, and embedded NTC thermistor resistance at ambient temperature. For power capacitor assemblies, measure capacitance using an AC bridge and verify discharge resistor values prior to commissioning.

Preparing Technical Specifications and Inquiries

To ensure an accurate commercial quotation, provide target Sun.King component part numbers, electrical operating parameters (voltage, current, frequency), mechanical mounting envelopes, and ambient operating conditions.

For custom semiconductor modules or capacitors, provide inverter circuit schematics and thermal cooling specifications.

For customized laminated busbars or CCS battery assemblies, submit 2D/3D CAD drawings (STEP/DWG format) indicating dielectric insulation ratings and connector interfaces to facilitate seamless engineering review with factory technical teams.