Photovoltaic Inverter PCBA – Product Description

Product Overview

Yaxingda provides high‑reliability PCBA manufacturing services for photovoltaic (PV) inverters – the core equipment that converts DC power from solar panels into AC power for grid connection. With extensive experience across the full spectrum of inverter applications – from residential micro‑inverters (180W–1kW) and single‑phase string inverters (1–10kW) to three‑phase commercial systems (4–80kW) and utility‑scale central inverters (up to 1.5MW) – we deliver PCBA solutions that meet the most demanding performance, safety, and durability requirements.

Key Technical Specifications

Core PCBA Board Types

• Control / DSP Board – Equipped with TI C2000 series DSP or multi‑core MCUs running MPPT algorithms, grid‑tie control, and islanding detection. High‑density BGA packages require 100% X‑Ray inspection.

• SiC / IGBT Driver Board – Integrates isolated gate drivers for silicon carbide (SiC) MOSFETs and IGBTs. With SiC modules now widely adopted, timing precision and SMT solder joint reliability are critical.

• MPPT Sampling & Protection Board – High‑precision ADC (16–24 bit) with ±1% precision resistors for maximum power point tracking. Includes over‑current, over‑voltage, and insulation impedance monitoring with ≤0.5% accuracy.

• Communication & Monitoring Board – RS485, Ethernet, WiFi, and 4G connectivity for cloud‑based plant monitoring.

Manufacturing Capabilities

High‑Power / Heavy‑Copper PCB Assembly
Inverter PCBA carries high currents – from tens to hundreds of amperes. We support aluminum‑based PCBs and heavy‑copper boards (2–4 oz) with large‑current trace opening and tin‑plating. For 3–4 oz copper boards, we apply stepped stencil design and optimized reflow temperature profiles to prevent cold joints and voids.

Thermal Management
Power devices generate significant heat during continuous switching-. We utilize aluminum substrates (thermal conductivity 1–3 W/m·K), thermal via arrays with conductive paste filling, and heatsink mounting structures to effectively dissipate heat and maintain stable operation.

High‑Voltage Isolation & Safety
With DC side voltages reaching 1500V, insulation design is critical. Our PCBA designs meet IEC 62109 standards with creepage distances ≥8mm (for insulation class IIIa) and electrical clearances ≥5mm for reinforced insulation. 100% Hi‑Pot testing at 3,000–5,000V AC is performed on every board.

Conformal Coating
All boards receive automatic conformal coating to protect against moisture, salt spray, dust, and electrochemical migration – essential for outdoor installations with 20‑25 year service life. Our 8 fully automatic coating lines ensure consistent, high‑quality coverage.

Precision SMT & Inspection
20 high‑speed SMT lines with 40M+ points/day capacity support fine‑pitch components including BGA, QFN, and 0201 packages-. Quality is ensured through AOI optical inspection, X‑Ray inspection for BGA solder joints, and in‑circuit testing (ICT)

N₂ Reflow Soldering
SiC MOSFETs are sensitive to high‑temperature oxidation. Our nitrogen‑protected reflow process (oxygen content ≤50ppm) ensures optimal wetting and solder joint reliability for third‑generation semiconductors.

Quality Assurance

• ISO9001 and IATF 16949 certified quality management systems

• 100% AOI inspection and X‑Ray inspection on every production board

• Hi‑Pot insulation testing (3,000–5,000V AC) on all high‑voltage boards

• IPC‑A‑610 Class 3 workmanship standards

• Thermal cycling testing: -40°C to +85°C, 500 cycles with no cracks

• Solder void rate controlled ≤1.5%, overall production yield ≥99.5%

• Full process traceability through MES system

Applications

Why Partner with Yaxingda