基于单片机技术的γ辐射仪高压电源设计

摘要

The design technology of high -voltage power based on Pulse Width Modulation is introduced ,which is used as Geiger -Muller counter ’ s high voltage bias power .The rectangular signal is produced by configuring the Programmable Counter Array of C8051f020,the forward transformer -isolated topologiesand voltage multipl-ying rectifier circuits isreferenced .By lab testing , while the duty cycle of PWM wave is 55%the output high voltage is 400 V,system consumption is 155 mV,voltage stability is less than 0.5%,ripple is less than 100 mV.Considering the stability and reliability of the high -voltage power , it could be used as source of γRadiom-eter .%介绍了一种基于单片机产生脉宽调制（ PWM）波的高压稳压电源设计，主要用于盖革-弥勒计数器的高压偏置源。由配置C8051 f020的可编程计数器阵列PCA产生矩形控制信号，选用变压器隔离正激式变换拓扑结构和倍压整流电路。经过实验测试，当PWM波的占空比为55％时，输出高压400 V，系统功耗155 mW，电压稳定度小于0．5％，纹波小于100 mV。电源性能稳定可靠，可用于γ辐射仪探测器的高压偏置源。