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Capacitive Transformerless Supply Sizing — result sheet
Estimate capacitive reactance, reactive VA, and series-capacitor value for a target RMS current at a stated AC voltage and frequency.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Xc = V/I; C = 1/(2πfXc) = I/(2πfV); ideal reactive VA = V×I.
A series capacitor presents capacitive reactance to an AC source. For an idealized current estimate, the target current and line voltage determine the required reactance, and frequency converts that reactance to capacitance. The page reports the electrical arithmetic but does not turn a non-isolated mains circuit into a safe power supply design.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- AC line voltage — V RMS; minimum 1.0E-6; maximum 1000000
- AC frequency — Hz; minimum 1.0E-6; maximum 1000000
- Target RMS current — A; minimum 1.0E-9; maximum 1000000
Worked example
| Input | Value |
|---|---|
| AC line voltage | 230 |
| AC frequency | 50 |
| Target RMS current | 0.1 |
Xc = 2,300 Ω, C ≈ 1.384 μF, and ideal reactive VA = 23 VA.
Assumptions and limits
- The target current is an RMS current through an ideal series capacitor at the stated sinusoidal voltage and frequency.
- The calculation ignores load power factor, capacitor tolerance, surge current, bleeder resistors, inrush, rectifier behavior, regulation, heat, and transient overvoltage.
- A transformerless circuit can expose every downstream node to mains potential; do not build or touch one from this estimate without qualified engineering, isolation, protection, and applicable standards.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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