![]() ![]() The Bootstrap circuit built using the capacitor C1 and Diode D1 is used to drive this MOSFET. The MOSFET used in the circuit is IRF840 which requires a gate to source voltage (Vgs) or threshold voltage (Vth) in range from 10 to 12V to fully turn ON. This MOSFET cannot be driven by applying a voltage at its gate and drain. The MOSFET (Shown as MOSFET Q1 in the circuit diagram) is connected in high side configuration as the load (Shown as resistance RL) is connected between the source and the ground. The signal is received through the output of another optocoupler (Shown as opt2 in the circuit diagram) which receives PWM by connecting its input pin to the pin 3 of the Arduino. Another PWM signal is required at the gate of the gate of the MOSFET. For proving PWM signal, bootstrap capacitor is connected to the output of an optocoupler (Shown as opt1 in the circuit diagram) which receives PWM by connecting its input pin to the pin 2 of the Arduino. ![]() ![]() The PWM signal is generated from an Arduino board. The bootstrap capacitor requires a PWM signal to turn on the MOSFET. This capacitor is represented as C1 in the circuit diagram. The bootstrap circuit is a capacitor connected at the gate of the MOSFET. For driving the MOSFET, a bootstrap circuit is connected at the load of the MOSFET. A MOSFET Q1 is taken which is connected as a high side switch with reference to the load RL.
0 Comments
Leave a Reply. |