Fundamentals of Switching Power Supply Transformers

Common high-frequency transformer types for switching power supplies include: EI, EE, ER, ERL, ETD, RM, PQ

Characteristics & Applications:

• EI/EE Types:
  Wide application range, high operating frequency, broad voltage tolerance, high output power, excellent thermal stability.
  Applications: Program-controlled switch power supplies, LCD display power, high-power UPS inverters, computer PSUs, compact electronic devices.

• ER/ERL/ETD Types:
  Low loss, high output power, wide frequency range, minimal temperature rise, stable performance.
  Applications: Telecom switches, TV/monitor PSUs, computer SMPS, precision instruments, DVD power.

• RM/PQ Types:
  Low magnetic leakage, reduced losses, minimal distributed capacitance.
  Applications: Communication switch-mode power supplies.

EE13 vs. EE19 Transformers:

1. Core Size: Same ferrite material, different dimensions

2. Power Capacity:

• EE19 has larger core cross-section (Ae) → higher wattage ratings

• EE19 handles all EE13 power ranges + higher capacities

3. Bobbin & Winding:

• EE19 accommodates thicker wire → higher current tolerance

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Why Do Golden Eagle's High-Frequency Transformers Gain Customer Recognition?

1. Single-piece flow lean production (zero WIP accumulation)

2. Full automation: winding → assembly → comprehensive testing

3. 100% Tier-1 supplier raw materials

Golden Eagle Transformer Advantages:

1. Certified to ISO 9001:2015, ISO 14001:2015, IATF 16949 & UL

2. In-house lab conducting reliability tests (materials → finished goods)

3. Consistent batch quality securing long-term partnerships with industry leaders

4. Premium Value:

• 10–20% price premium vs. 1–2× industry-average lifespan

• 2–3× standard material sampling rate

• 75 quality control points (insurance-grade reliability)

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Golden Eagle is a vertically integrated manufacturer specializing in design, R&D, production, and sales. Core products:

• PCB mount transformers

• Planar transformers

• High/Low-frequency transformers

• Toroidal inductors

• Integrated SMD inductors
  Widely used in consumer electronics, appliances, and industrial sectors.