Abstract: In order to improve the reliability and intelligence of system power supply, a design method of DC power supply system based on TI high-performance digital signal processor TMS320F2812 and based on CAN bus is proposed. At the same time, the system software flow design and debugging method based on CAN bus is discussed in detail.
Keywords: DSP; DC power supply; CAN bus; parameter acquisition
O Introduction The reliable and safe operation of the power supply in the system is inseparable from its real-time monitoring and control. In order to improve the reliability of the system power supply, this paper proposes a design method of DC power supply system with TMS320F2812 digital signal processor integrated with eCAN module and ADC acquisition module as the core controller. The system can realize the intelligentization of DC power supply of the system by real-time monitoring of system voltage and current parameters and rapid response to overcurrent and undervoltage protection.
1 System overall design The actual system usually has multiple loads. For the convenience of research, it is discussed in a single way. Its system composition is shown in Figure 1. The power manager is the control core of the power supply system, including DSP processor, CAN interface, current and voltage detection circuit. After the system is powered on, the voltage and current of the battery can be continuously monitored. The hybrid charger can accept DC or AC power input, wherein: DC is from the vehicle generator set. When the power manager detects that the speed signal of the vehicle generator is higher than a certain set value, the relay l is turned on to realize DC power supply, and vice versa. Then disconnected; AC power comes from the mains 220 V, when the power manager detects the mains access, the relay 1 will be disconnected to achieve AC priority power. Relay 2 acts as a control element in the system and can be disconnected as soon as the current sensor detects an overcurrent in the system. Communication between the host computer and the power manager can be performed via CAN. After the system is powered on, the power manager can send the voltage and current signal acquisition information to the upper computer. At the same time, the power manager can receive the command information from the upper computer.
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