Design of a DC power supply system based on DSP - Power Circuit - Circuit Diagram

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Abstract: To enhance the reliability and intelligence of the system's power supply, this paper proposes a design approach for a DC power supply system based on Texas Instruments' high-performance digital signal processor, TMS320F2812, along with a CAN bus. The system software flow design and debugging methods based on CAN bus are also thoroughly discussed.

Keywords: DSP; DC power supply; CAN bus; parameter acquisition

O Introduction: The reliable and safe operation of the power supply within a system is highly dependent on real-time monitoring and control. To boost the reliability of the system power supply, this study introduces a design method for a DC power supply system using TMS320F2812 digital signal processors, which integrate both eCAN modules and ADC acquisition modules as the core controllers. This system enables the intelligent management of the system's DC power supply by continuously monitoring voltage and current parameters and quickly responding to overcurrent and undervoltage protection mechanisms.

1 System Overall Design: In most practical systems, there are multiple loads. For simplicity in discussion, we consider a single load scenario. As illustrated in Figure 1, the power manager serves as the control center of the power supply system, including a DSP processor, CAN interface, and current and voltage detection circuits. Once the system powers on, the battery's voltage and current can be continuously monitored. The hybrid charger can accept either DC or AC power inputs. When the power manager detects that the vehicle generator's speed exceeds a specific threshold, Relay 1 is activated to enable DC power supply, and vice versa. If the mains power at 220V is detected, Relay 1 disconnects to prioritize AC power. Relay 2 functions as a control element, disconnecting immediately if the current sensor detects an overcurrent condition. Communication between the host computer and the power manager occurs via CAN. After the system powers on, the power manager sends voltage and current signal acquisition information to the upper-level computer. Simultaneously, the power manager can receive command signals from the upper-level computer.

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