Detailed Technical Description

The ABB / Power-One / FIMER SMPS Power Supply Board (Rev. 3M22) is an original electronic module designed for high-power three-phase photovoltaic inverters of the Aurora TRIO 20.0 kW and 27.6 kW series.

This board operates as a switching power supply (SMPS), converting energy from the internal DC bus and generating all the auxiliary voltages required by the inverter’s control and logic circuits.

It is a critical component for inverter startup, operational stability, and overall system functionality.

⚙️ Main Functions

• DC/DC conversion from internal power bus (Bulk)
• Generation of stabilized auxiliary voltages (+5 V, +12 V, ±15 V)
• Galvanic isolation between power and control sections
• Power supply for CPU, DSP, drivers, and logic circuits
• EMI filtering and electrical stabilization
• Support for inverter startup (startup circuit)

🔌 Technical Features

• Manufacturer: ABB / Power-One / FIMER
• Application: Three-phase photovoltaic inverters
• Compatible series: TRIO 20.0 / 27.6 kW
• Board revision: 3M22
• Technology: Switching Power Supply (SMPS)
• Compliance: RoHS (Pb-Free)

Main Sections:

• High-frequency switching conversion stage
• Shielded isolation transformer
• PWM regulation circuit
• EMI and output filters

Connections:

• Input from DC bus (Bulk / GRP)
• Connectors to logic and control boards
• Auxiliary voltage outputs

🔧 Main Components

• High-frequency switching transformer
• Inductors and EMI filters
• Power MOSFETs and switching regulators
• Electrolytic and film capacitors
• PWM control ICs
• Precision SMD components

🌐 Role within the Inverter

This board is essential for inverter operation:

• Supplies power to all electronic boards
• Ensures stability of internal voltages
• Enables proper system startup
• Protects circuits from disturbances and fluctuations

👉 In Aurora / FIMER inverters, the power supply module is fundamental for the entire system.

⚠️ Typical Issues Solved

• Inverter completely off
• No startup / power-on failure
• No display or communication
• Generic internal errors
• Control board power faults
• Random shutdowns or restarts

⚠️ Common Failures

• Degraded or swollen capacitors
• Faulty switching MOSFETs
• Damaged switching transformer
• Malfunctioning PWM control circuit
• Missing output voltages
• Unstable power supply lines

🏭 Compatibility

• ABB Aurora TRIO-20.0-TL
• ABB Aurora TRIO-27.6-TL
• FIMER TRIO equivalent models
• Industrial and commercial inverter versions

📊 Applications

• Repair of photovoltaic inverters
• Replacement of faulty power supply boards
• Maintenance of industrial PV systems
• Electronic fault diagnostics