1数控直流电源设计.docx.docxVIP

摘要:本系统是以直流电压源为核心，以AT89C51单片机为主控制器，通过按键来设置直流电源的输出电压，步进电压等级可达0.1V，输出电压为0—9.9V之间，最大电流能达到330mA，并可由液晶显示屏输出实际电压值。系统中的ADC0832?是8位分辨率的A/D转换芯片，它的分辨最高能达到256级，能够适应一般情况下的模拟量转换要求。其内部电源的输入和参考电压的复用，使得芯片的输入的模拟电压范围在0~5V之间。芯片的转换时间只有32μS，据有双数据输出可用做数据校验，从而减小数据的误差，它的转换速率快而且稳定性能好。单独的芯片使能输入，使多器件的挂接和处理器的控制变地更加便捷。经过DI?数据输入端，能够轻松地实现通道功能的选取。本系统是由单片机来控制输出数字信号，经过D/A转换器（AD0832）输出模拟信号量，再由运算放大器隔离放大，控制输出功率管的基极，以功率管电压输出的不同来变化电压。经过实际检测结果表明，本系统可以应用于需求高稳定度和小功率恒压源的场合。关键词：直流稳压电源;单片机;数字控制Abstract:This?system?to?dc?voltage?source?as?the?core,?mainly?AT89S52?SCM,?through?the?keyboard?controller?to?install?dc?power?supply?output?voltage,?setting?stepping?class?can?reach.01v?output?voltage,?the?range?of?0-9.9?V,the?maximum?current?330mA?for,?and?canshow?theactual?pipeby?DigitalOutput voltage?values.?This System ADC0832 8-bit resolution A / D converter chip, the highest resolution up to 256, can be adapted to the general analog conversion requirements. The internal power supply input and reference voltage multiplexing, allows the chip analog voltage between 0 ~ 5V input. Chip conversion time of only 32μS, according to a pair of data output can be used as validation data to reduce data errors, the conversion is fast and strong stability. Separate chip enable input, so many hooks and processor control device becomes more convenient. Data input through the DI, you can easily choose the realization of channel functionThis system consists of microcontroller program output digital signal, through D/A converter (AD2083) output analog amplifier, through isolating amplifier output power, control of base, with the power to change the passive tube voltage output of different voltage. Test results show that this system application in need of high stability of small power constant-voltage source fields. Key?word:sregulated?power?supply?of?direct?current;?single2ch?ip?m?icrocomputer;digital?control1数控直流电源设计1.1?选题背景几近所有的电子设备都需要一个稳定的直流电源，是以直流稳压电源的应用是非常广泛的。直流稳压电源的电路模式有很多种，有串联型、开关型、集成电路、稳压管直流稳压电源等等。在电子设备中，直流稳压电源有着最高的故障率（长时间劳作在