Power Electronics Calculators

Voltage Divider

Calculate voltage divider output voltage, current, Thévenin impedance, and power dissipation from Vin, R1, and R2. Ideal for bias networks and level shifting.

LED Resistor

Calculate the correct current limiting resistor for an LED. Shows exact value, nearest E24 standard, actual current, and power dissipation.

Buck Converter

Design a synchronous buck (step-down) converter: calculate duty cycle, inductor value, output capacitor, input capacitor, and theoretical efficiency.

LDO Thermal

Calculate LDO regulator power dissipation, junction temperature, thermal margin, and minimum dropout voltage for thermal design validation.

Battery Life

Estimate battery runtime for IoT and portable devices given average current draw, duty cycle, self-discharge rate, and depth-of-discharge cutoff. Suitable for LiPo, alkaline, NiMH, and coin-cell batteries.

Power Factor

Calculate power factor, reactive power, and correction capacitor for AC circuits

Boost Converter

Calculate duty cycle, inductor value, and output capacitor for boost (step-up) DC-DC converter design

3-Phase Power

Calculate three-phase real power, reactive power, apparent power, current, and power factor from line or phase values

PWM Duty Cycle

Calculate PWM duty cycle, frequency, average voltage, off-time, and RMS voltage from on-time and period parameters

MOSFET Power Loss

Calculate MOSFET conduction loss, switching loss, total power dissipation, junction temperature, and efficiency for power electronics design

Solar Panel Sizing

Calculate solar panel wattage, battery capacity, and charge controller current for off-grid photovoltaic systems based on load and sun hours

Battery Charge Time

Calculate Li-ion battery charge time using CC/CV method, including CC phase duration, total charge time, energy input, and charging efficiency

Inrush Current Limiter

Calculate NTC thermistor requirements for inrush current limiting, including cold resistance, peak inrush current, time constant, and energy absorbed

Charge Pump

Calculate Dickson charge pump output voltage, loaded voltage, output ripple, and efficiency for switched-capacitor voltage multiplier circuits

Switching Regulator Ripple

Calculate buck converter output voltage ripple, inductor current ripple, and ESR contribution for switching regulator design

LDO Dropout

Calculate LDO regulator power dissipation, junction temperature rise, minimum input voltage, efficiency, and headroom for linear regulator design