Transformers and Power Supplies
Rectifier DC Output Calculator
This calculator evaluates average DC output for a single transformers and power supplies scenario. It uses AC RMS voltage and rectifier factor and shows the equation behind the displayed value.
Inputs for this calculation
Do not mix values recorded under different conditions.
Preparing the calculation
Record waveform, frequency, load level, and winding or device temperature. If operating conditions changed between readings, calculate separate cases.
A prefix error can move the result by several orders of magnitude. Capacitive Reactance Calculator covers the related capacitive reactance step.
- AC RMS voltage
- Default example: 12 V. Enter AC RMS voltage in V.
- Rectifier factor
- Default example: 0.9. Enter rectifier factor.
From inputs to result
The arithmetic is based on Vdc ≈ Vrms × rectifier factor. The participating entries are AC RMS voltage and Rectifier factor.
The initial scenario returns 10.80 V. Re-enter field data before using the answer in a design or comparison.
Calculate average DC output from AC RMS voltage and rectifier factor. Continue to Peak RMS Voltage Calculator if RMS voltage is also needed.
Using the answer downstream
Record AC RMS voltage and rectifier factor with average DC output. Include the operating state and data source.
Transfer average DC output before applying any display rounding. Round at the final reporting step.
Applying the result
Use Average DC output as one quantified check within the larger decision. Compare it with component ratings and isolation requirements.
Store the measurement state and conversion notes with the answer. For the companion inductive reactance calculation, open Inductive Reactance Calculator.
Before accepting the number
A plausible-looking output does not prove that the entries are compatible.
Trace an unexpected result back through the raw entries first.
Checks before using the answer
Diode drops and load current change output.
The arithmetic intentionally leaves out isolation, creepage, waveform shape, and manufacturer operating limits. Use measurements, manufacturer data, or another calculation for effects that can change the decision.
Record waveform, frequency, load level, and winding or device temperature. The broader analysis may also use Inverter Battery Current Calculator.
A final reasonableness check
Begin by confirming rectifier factor at the operating point represented by the other entries. Record whether it came from a meter, nameplate, data sheet, or design assumption.
The displayed average DC output should be checked against voltage stress, current stress, ripple, loss, regulation, and temperature. Investigate an unexpected magnitude before changing the model or adding margin.
Document any effect handled outside this page, especially diode loss, ESR, regulation, ripple current, and thermal resistance. That note prevents a later reader from assuming the simple equation covered it.
Questions from practical use
Should a blank measurement be entered as zero?
Leave the case unfinished until the real value is known rather than entering a placeholder zero.
How should I prepare the Rectifier DC Output inputs?
Measured and rated values can represent different states. Use voltage and current values from the same side of the transformer or converter.