Transformers and Power Supplies
Flyback Transformer Calculator
Flyback Transformer helps you find ideal secondary voltage from primary voltage and turns-duty factor. The page keeps the arithmetic visible so you can check the result against the original measurements.
Set up the Flyback Transformer case
Enter ratings or measurements that describe one scenario.
From inputs to result
This page evaluates Vs ≈ Vp × turns-duty factor. The formula draws on Primary voltage and Turns-duty factor.
The initial scenario returns 76.80 V. Re-enter field data before using the answer in a design or comparison.
Calculate ideal secondary voltage from primary voltage and turns-duty factor. If you also need ideal boost output, continue with Boost Converter Calculator.
Preparing the calculation
Use voltage and current values from the same side of the transformer or converter. If operating conditions changed between readings, calculate separate cases.
Use the displayed unit for every field and document conversions separately. A connected part of the work can be checked with Capacitive Reactance Calculator.
- Primary voltage
- Default example: 24 V. Enter primary voltage in V.
- Turns-duty factor
- Default example: 3.2. Enter turns-duty factor.
Input quality checks
Values recorded at different operating points should not share one case.
Check the input source before adding a safety or correction factor.
Assumptions and limitations
Leakage inductance and switching loss require a detailed design.
The surrounding system may introduce leakage inductance, parasitic capacitance, saturation, switching transients, and cooling. Resolve material omissions before selecting a standard size or rating.
Use voltage and current values from the same side of the transformer or converter.
A second scenario
Change Primary voltage from 24 V to 28.799999999999997 V and preserve the rest of the case. This moves the answer from 76.80 V to 92.16 V.
This isolates one variable; a real system may change several at once.
Before relying on the answer
Why does Ideal secondary voltage show several decimals?
Retain the raw result for comparison and create a separately rounded reporting value if needed.
What does a zero entry represent?
Leave the case unfinished until the real value is known rather than entering a placeholder zero.
What data should go into Flyback Transformer?
Use primary voltage and turns-duty factor from one operating condition. Record waveform, frequency, load level, and winding or device temperature.
What assumptions affect Ideal secondary voltage?
The result follows the displayed variables. Check isolation, creepage, waveform shape, and manufacturer operating limits separately.
What explains a gap between calculated and observed ideal secondary voltage?
First confirm that the measurements match the equation. Then review isolation, creepage, waveform shape, and manufacturer operating limits.