Calculadora de Convertidor Flyback
Calcula la relación de transformación y las corrientes pico de un convertidor flyback en modo de conducción discontinua.
Fórmula
N = \frac{V_{in} \cdot D}{V_{out}(1-D)},\quad I_{p,peak} = \frac{2 I_{in}}{D}
Referencia: Unitrode Power Supply Design Seminar SEM600
Cómo Funciona
A flyback converter is a type of switched-mode power supply that uses a transformer to store and transfer energy between input and output circuits. During the switch's on-time, energy is stored in the transformer's magnetizing inductance, and during the off-time, this stored energy is transferred to the output. This topology allows for efficient voltage conversion and galvanic isolation.
Ejemplo Resuelto
Problem: Design a flyback converter with Vin = 12V, Vout = 5V, switching frequency fs = 100 kHz, duty cycle D = 0.4, and diode forward voltage VD = 0.7V Solution: 1. Calculate turns ratio N: N = (12V · 0.4) / ((5V + 0.7V) · (1 - 0.4)) = 2.14 2. Calculate peak input current: Iin = (5V · 1A) / 12V = 0.417A 3. Calculate peak primary current: Ipk = 2 · 0.417 / 0.4 = 2.085A 4. Calculate output power: Pout = 0.5 · Lm · (2.085)² · 100 kHz · (2.14)² = 5.14W
Consejos Prácticos
- ✓Choose low-loss MOSFET with fast switching characteristics
- ✓Use Schottky diodes for lower forward voltage drop
- ✓Implement adequate thermal management
- ✓Select magnetic core material with high permeability
Errores Comunes
- ✗Neglecting diode forward voltage drop in calculations
- ✗Incorrect estimation of magnetizing inductance
- ✗Not accounting for transformer core saturation
- ✗Overlooking parasitic resistances and capacitances
Preguntas Frecuentes
Shop Components
Affiliate links — we may earn a commission at no cost to you.
Related Calculators
Power
Transformer Turns Ratio
Calculate transformer turns ratio, secondary current, apparent power, and real power delivered. Accounts for transformer efficiency.
Power
Buck Converter
Design a synchronous buck (step-down) converter: calculate duty cycle, inductor value, output capacitor, input capacitor, and theoretical efficiency.
Power
MOSFET Power Loss
Calculate MOSFET conduction loss, switching loss, total power dissipation, junction temperature, and efficiency for power electronics design
Power
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.
Power
LED Resistor
Calculate the correct current limiting resistor for an LED. Shows exact value, nearest E24 standard, actual current, and power dissipation.
Power
LDO Thermal
Calculate LDO regulator power dissipation, junction temperature, thermal margin, and minimum dropout voltage for thermal design validation.