原创 [TI博客大赛][原创]程控开关稳压电源的设计

程控开关稳压电源的设计 摘要 本系统以TI MSP430F169为核心，电压可预置，步进电压为0.1V，输出电压范围为20V～36V，输出电流为0～2A。可显示预置电压，实测电压，实测电流，实测效率。该系统主要由最小单片机系统，PWM信号控制芯片TL494，开关电源升压主回路，片上A/D以及片上D/A组成。系统通过键盘预置电压值送给TL494形成闭环反馈回路，采样康铜丝上的电压间接推算出电流并显示。本系统具有调整速度快，精度高，电压调整率低，负载调整率低，效率高，无需另加辅助电源板，输出纹波小等优点。 关键词：C8051F020；TL494；开关电源；BOOST电路。 ABSTRACT For this system to TI MSP430F169 core voltage can be preset, stepping voltage of 1V output voltage range of 20V to 36V, output current is 0-2A. That preset voltage can be measured voltage, current measurement, the measured efficiency. The system mainly by the smallest SCM system, TL494 chip PWM control signal, the main boost switching power supply circuit, chip’s A/D and D/A component. Through the keyboard preset voltage TL494 gave a closed-loop feedback loop, sampling the voltage copper wire Kang indirectly current and projected that. The system has adjusted speed, high precision, low voltage adjustment, the adjusted rates low load, high efficiency, no auxiliary power supply plus a plate, the advantages of small output ripple. Keywords: MSP430F169; TL494; Switching Power Supply; Boost Circuit.