摘要
介绍了一种以深埋齐纳电压基准元件LTZ1000A主电路为基础，结合脉宽调制技术实现的在0～10V范围内连续可调的高稳定直流电压源。选用精密电阻并采用适当的保温与隔离措施，实现了电压基准主电路输出高稳定7V电压，其短期稳定性达到1．7×10^-8。利用具有相同温度系数和阻值的精密电阻组成比例升压电阻网络，使输出10V电压的短期稳定性为2．4×10^-8。同时利用脉宽调制并经DC—DC转换电路及滤波电路得到0～10V的电压输出，短期稳定性可在10^-7量级左右。
A continuously adjustable high stable DC voltage reference based on subsurface Zener reference LTZ1000A is presented and PWM technique is adopted to output voltages between 0 - 10 V. With selecting high precise resistors and using appropriate measures to insulate and isolate, the short-time relative stability of 7 V output voltage provided by LTZ 1000 is 1.7× 10^-8. The voltage of 10 V is increased up by a network,composed by high precise resistors with the same temperature coefficient, and its short-time relative stability is 2.4 × 10^-8. The voltage of 0 - 10 V generated by PWM technique and suitable DC-DC conversion-filter circuit are measured and the short term relative stabilities are about 10^-7 .
出处
《计量学报》
CSCD
北大核心
2014年第2期169-172,共4页
Acta Metrologica Sinica
关键词
计量学
直流电压源
脉宽调制
连续可调
高稳定
Metrology
DC voltage source
PWM
Continuously adjustable
High stable
