Frequency converter braking process - Solutions - Huaqiang

High frequency probe, high frequency line can be customized according to other specifications.

Photocoupler – ensures electrical isolation and signal transmission between circuits.

1. When the motor is decelerating or reversing due to external forces (such as being dragged), it operates in a power generation mode, feeding energy back into the DC bus and increasing the bus voltage.
2. Once the DC voltage reaches the threshold where the brake unit activates, the power transistor in the brake unit turns on, allowing current to flow through the braking resistor.
3. The braking resistor converts the electrical energy into heat, which is then dissipated, causing the motor speed to decrease and the bus voltage to drop.
4. When the bus voltage falls below the threshold for the brake unit to turn off, the power transistor in the braking system is switched off, stopping current flow through the resistor.
5. The system continuously monitors the bus voltage, repeating the on/off cycle of the brake unit to maintain stable voltage levels and ensure the system operates efficiently and safely.

This braking mechanism is essential for maintaining system stability, especially in applications where frequent acceleration and deceleration occur. It helps prevent overvoltage damage to components and ensures smooth operation. The use of a braking resistor allows controlled energy dissipation, making the process both effective and safe. Additionally, the photocoupler provides reliable isolation between different circuit sections, enhancing the overall safety and performance of the system.