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High Side MOSFET Bootstrap Circuit

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Introduction and Methods: High side MOSFET requires external circuitry to turn on
Three methods exist: dual power supply, gate driver IC, and bootstrap circuitry
Circuit Components and Setup: Bootstrap circuit uses capacitor and diode for driving MOSFET
Two optocouplers provide optical isolation between input and output
Arduino generates PWM signals at 5V with 180-degree phase difference
Working Principle: MOSFET requires 10-12V gate-source voltage to turn on
Bootstrap capacitor charges through load to 12V
Diode reverse biases to maintain 12V across capacitor
Output alternates between HIGH and LOW states for 1 second
Technical Details: Circuit frequency is 0.5Hz with 50% duty cycle
Bootstrap capacitor value calculated using T = 5RC equation
Circuit requires low gate-source resistor (10E-500E)
Circuit is load-dependent and cost-effective
Applications: Suitable for DC-AC converters and induction heating
Can be used in half bridge MOSFET circuits