DC-DC Converter Current Limiting for Input Voltage Stability

The control system dynamically switches between voltage control mode and current control mode based on real-time monitoring of input voltage levels. When input voltage remains above a threshold, voltage control mode operates to efficiently charge the link capacitor. When input voltage drops below the threshold, the system transitions to current control mode with a reduced current ceiling to prevent further voltage degradation, thereby maintaining reliability of both the charging process and connected consumers.

The control apparatus changes the current control parameter (current ceiling) based on the input voltage state. In normal conditions, the system allows higher current to quickly restore the link capacitor. When voltage drop is detected, the system reduces the current ceiling to a lower value, effectively adapting the charging parameters to prevent over-stressing the low-voltage battery and maintain stable operation of connected consumers.

The control system dynamically adjusts the current ceiling based on real-time input voltage monitoring. During normal charging when input voltage is sufficient, the system operates at high current to maximize charging speed. When input voltage drops below the threshold, the system automatically reduces the current ceiling to prevent excessive voltage drop, thereby maintaining the stability of connected consumers while continuing the charging process at a reduced rate.

The control apparatus continuously monitors the input voltage and periodically adjusts the current control mode accordingly. This periodic monitoring and adjustment ensures that the system can respond to changing voltage conditions, switching between high-current charging mode and limited-current mode to balance charging speed with consumer operation stability.