Coupled inductors are used in some multi-output power supplies to improve current sharing, ripple behavior, or cross regulation. BaoHui Tech reviews coupled inductor projects by looking at winding polarity, coupling factor, current stress, core saturation, thermal rise, insulation, and the control strategy of the converter.
Why Coupling Changes Circuit Behavior
Unlike separate inductors, coupled inductors share magnetic flux between windings. This can improve certain converter behaviors, but it also means one output can influence another. Winding polarity, leakage inductance, and coupling factor must match the circuit intent.
In multi-output power supplies, load imbalance and transient response can expose weak magnetic design. A nominal inductance value is not enough to define the part.
Design Inputs for Coupled Inductors
BaoHui Tech reviews both electrical and manufacturing constraints before confirming a coupled inductor design. The construction needs to be repeatable, not only functional in a first sample.
- Number of windings, polarity, turns ratio, and required coupling factor
- DC current, ripple current, peak current, and load imbalance conditions
- Core material, saturation margin, gap structure, and temperature rise
- Insulation between windings, hipot requirement, creepage, and clearance
- Test method for inductance, leakage, coupling, resistance, and polarity
Testing in the Converter
Coupled inductors should be tested in the target converter because cross regulation, ripple, and transient behavior depend on the control loop and load profile. Bench measurements alone may not reveal interaction between outputs.
Production control should define winding order, polarity markings, lead routing, core gap, and inspection limits. Mistakes in polarity or winding sequence can create immediate converter failure.
BaoHui Tech Engineering Support
BaoHui Tech manufactures custom inductors, coupled inductors, high frequency transformers, power transformers, common mode chokes, and filters for power supplies, inverters, and industrial electronics. The company can support magnetic design review for multi-output converter applications.
FAQ
Useful inputs include topology, voltage, current, power level, operating frequency, waveform, insulation and safety requirements, thermal environment, dimensions, mounting method, expected tests, and production volume. Complete data lets BaoHui Tech review the project as a custom transformer manufacturer rather than as a generic part request.
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