高精度稳压恒流可编程电源的研制

The development of high accuracy constant voltage and constant current programmable power supply

稳压恒流源在电子设备中的运用非常广泛。本文介绍的电源采用控制电路和主电路各自单独供电,理论上只要主电路能够承受,就可以提供任意想要的输出的电压值和电流值。电路采用了预稳压电路,用以减少电路的纹波系数及调整管的压降。采用CPU控制D/A输出用作电路的基准源,方便控制输出电压;控制部分采用闭环控制,实现输出值与设定值无偏差输出。电路可根据负载自动实现稳压与稳流的自动转换电路。用户通过键盘设定输出电压和输出电流值,同时显示输出值大小。

The constant voltage and constant current power supply is extremely widespread in electronic equipment. This power supply which the main circuit＇ s supplies power and the control circuit＇s is independence, so high as the main circuit can withstand, the output voltage value and the magnitude of current can provide. The electric circuit has used the pre-voltage-stabilizer circuit, with reduces the ripple coefficient. Base on the CPU, to adjusts the power output is very expedient, used keyboard to set the output, and used LED to display the output voltage and current. The electric circuit can work in the constant voltage or the stationary current according to the output load automatically.