High Power Transformers

🔄 Toroidal Transformers / Inductors

• Shape: Donut-like (toroidal) with thick copper windings.
• Core: Likely ferrite or powdered iron, designed for high-frequency use.
• Use:
  • These are likely toroidal inductors or transformers used in inverters, high-frequency welding machines, or power filtering.
  • The tightly wound copper wire indicates high current capacity.
  • The white braided insulation on the lower toroid suggests high voltage isolation.

✅ Key Advantages:

• High efficiency
• Low EMI (Electromagnetic Interference)
• Compact for the power they handle
• Common in switch-mode power supplies and DC-DC converters

🧱 EI-Core High-Power Transformers

The most common type of AC power transformer. It is called an EI-core transformer, because the laminated iron core that it’s wound on (before assembly) looks like the letters “E” and “I.”

• Core Type: Laminated EI-core (rectangular iron core)
• Construction: Dual bobbin windings (likely primary and secondary), with heavy insulation tape.
• Mounting: Rigid base, probably chassis-mounted.
• Use:
  • This is a classic high-power transformer, likely for stepping voltage up or down in a welding machine, UPS, or large AC power supply.
  • Its robust construction suggests it handles substantial power loads.

✅ Key Features:

• Handles large currents at low frequencies (50/60 Hz)
• Rugged and reliable
• Often used in older or heavy-duty equipment
• May include taps for adjustable output voltages

🏭 Common Applications

• Welding Machines (AC/DC types, inverters)
• Industrial Battery Chargers
• Solar and Wind Inverters
• UPS Systems (Uninterruptible Power Supplies)
• High-Power Audio Amplifiers
• Motor Drives and Controllers