Electric Bike Bldc Hub Motor Control Using The Z8fmc1600 Mcu

This circuit also prevents the shutdown circuit of the IR2161 from operating in the normal way; therefore, an external SCR-based protection circuit needs to be added.

The IR2161 is a high-voltage, high-speed driver designed for driving IGBTs and MOSFETs in half-bridge configurations. In typical applications, the shutdown circuit is a critical component that ensures the safe operation of the driver by disabling the output under fault conditions. However, in certain scenarios, this shutdown mechanism may not function as intended, necessitating the integration of an additional protection circuit.

The proposed solution involves the incorporation of an external SCR (Silicon Controlled Rectifier) based protection circuit. This circuit serves as a backup safety mechanism that activates under specific fault conditions, effectively preventing damage to the power stage and ensuring reliable operation of the overall system. The SCR is chosen for its ability to handle high currents and voltages, making it suitable for protecting against overcurrent or overvoltage conditions.

To implement this protection circuit, it is essential to connect the SCR in parallel with the load. The gate of the SCR can be triggered by a dedicated fault detection circuit that monitors critical parameters such as current and voltage levels. When an anomaly is detected, the fault detection circuit will provide a gate pulse to the SCR, turning it on and redirecting the fault current away from the sensitive components of the circuit.

In conclusion, integrating an external SCR-based protection circuit with the IR2161 driver enhances the reliability and safety of the circuit, ensuring that even if the internal shutdown mechanism fails, the system remains protected against potential damage. This design consideration is crucial for applications where system reliability is paramount, such as in industrial motor drives and power conversion systems.This circuit also prevents the shutdown circuit of the IR2161 from operating in the normal way and therefore the external SCR based protection circuit also needs to be added. 🔗 External reference