In order to solve the disadvantages caused by mechanical slide rheostat that has big errors and low precision,a novel voltage regulation method for high voltage DC power supply was introduced.The key of this method we...In order to solve the disadvantages caused by mechanical slide rheostat that has big errors and low precision,a novel voltage regulation method for high voltage DC power supply was introduced.The key of this method were digital potentiometer MAXIM 5455 and linear photoelectric coupling LOC110,and application programs were compiled using Visual Basic which was graphical compiling language,furthermore the communication between exterior and computer was carried out by ICP7044D module,in consequence the output value of high voltage DC power supply could be regulated with computer.The measured results showed that this method could accurately,conveniently and rapidly regulate the output value of high voltage DC power supply.展开更多
A linear voltage regulator was irradiated by ^（60）Coγat high and low dose rates with two bias conditions to investigate the dose rate effect.The devices exhibit enhanced low dose rate sensitivity（ELDRS） under bot...A linear voltage regulator was irradiated by ^（60）Coγat high and low dose rates with two bias conditions to investigate the dose rate effect.The devices exhibit enhanced low dose rate sensitivity（ELDRS） under both biases. Comparing the enhancement factors between zero and working biases,it was found that the ELDRS is more severe under zero bias conditions.This confirms that the ELDRS is related to the low electric field in a bipolar structure. The reasons for the change in the line regulation and the maximum drive current were analyzed by combining the principle of linear voltage regulator with irradiation response of the transistors and error amplifier in the regulator. This may be helpful for designing radiation hardened devices.展开更多
Radiation-induced 1/f noise degradation in the LM117 bipolar linear voltage regulator is studied. Based on the radiation-induced degradation mechanism of the output voltage, it is suggested that the band-gap reference...Radiation-induced 1/f noise degradation in the LM117 bipolar linear voltage regulator is studied. Based on the radiation-induced degradation mechanism of the output voltage, it is suggested that the band-gap reference subcircuit is the critical component which leads to the 1/f noise degradation of the LM117. The radiation makes the base surface current of the bipolar junction transistors of the band-gap reference subcircuit increase, which leads to an increase in the output 1/f noise of the LM117. Compared to the output voltage, the 1/f noise parameter is more sensitive, it may be used to evaluate the radiation resistance capability of LM117.展开更多
自动电压调节器(Automatic Voltage Regulator, AVR)的性能往往受到同步发电机高场电感和连续负载变化的影响,电力系统中参数的不确定性对于系统整体性能是一个重大挑战,在设计控制策略时需要重点考虑。线性自抗扰控制(Linear Active Di...自动电压调节器(Automatic Voltage Regulator, AVR)的性能往往受到同步发电机高场电感和连续负载变化的影响,电力系统中参数的不确定性对于系统整体性能是一个重大挑战,在设计控制策略时需要重点考虑。线性自抗扰控制(Linear Active Disturbance Rejection Control, LADRC)的显著特点是能够实时估计和消除总扰动,并且不依赖于准确模型。在解决终端电压变化问题时,LADRC是一种可行的解决方案。探讨了三阶线性自抗扰控制器与高阶PID的关系,研究了线性自抗扰控制在AVR电压控制问题中的应用。针对目前AVR中普遍存在的定子电流限制(Stator Current Limit, SCL)问题,提出了一种补偿方案。方案引入发电机理论输出和实际输出的误差作为额外扰动输入,利用扩张状态观测器(Extended State Observer, ESO)对其进行估计,这样可以令线性自抗扰控制器快速补偿误差。仿真证明了与高阶PID相比,LADRC具有更强的抗干扰性,可以取得更好的控制效果。展开更多
以设计输出电流为800mA的高稳定线性稳压器(low-dropout voltage regulator,LDO)为目标,利用工作在线性区的MOS管具有压控电阻特性,构造零点跟踪电路以抵消随输出电流变化的极点,并且采用了改进型米勒补偿方案使电路系统具有60°的...以设计输出电流为800mA的高稳定线性稳压器(low-dropout voltage regulator,LDO)为目标,利用工作在线性区的MOS管具有压控电阻特性,构造零点跟踪电路以抵消随输出电流变化的极点,并且采用了改进型米勒补偿方案使电路系统具有60°的相位裕度,达到了大输出电流下的高稳定性要求.另外,分析了电路在转换发生时电路结构参数和负载整流特性的关系,提出了一种能在瞬间提供大电流的转换速率加强电路,达到了在负载电流从800mA到10mA跳变时,输出电压的跳变量控制在60mV以内,并且最长输出电压恢复时间在500μs以内.芯片采用CSMC公司的0.6μm CMOS数模混合信号工艺设计,并经过流片和测试,测试结果验证了设计方案.展开更多
基金Project Supported by National Natural Science Foundation of China（50637020）.
文摘In order to solve the disadvantages caused by mechanical slide rheostat that has big errors and low precision,a novel voltage regulation method for high voltage DC power supply was introduced.The key of this method were digital potentiometer MAXIM 5455 and linear photoelectric coupling LOC110,and application programs were compiled using Visual Basic which was graphical compiling language,furthermore the communication between exterior and computer was carried out by ICP7044D module,in consequence the output value of high voltage DC power supply could be regulated with computer.The measured results showed that this method could accurately,conveniently and rapidly regulate the output value of high voltage DC power supply.
文摘A linear voltage regulator was irradiated by ^（60）Coγat high and low dose rates with two bias conditions to investigate the dose rate effect.The devices exhibit enhanced low dose rate sensitivity（ELDRS） under both biases. Comparing the enhancement factors between zero and working biases,it was found that the ELDRS is more severe under zero bias conditions.This confirms that the ELDRS is related to the low electric field in a bipolar structure. The reasons for the change in the line regulation and the maximum drive current were analyzed by combining the principle of linear voltage regulator with irradiation response of the transistors and error amplifier in the regulator. This may be helpful for designing radiation hardened devices.
基金Project supported by the National Natural Science Foundation of China(Nos.61076101,61204092)
文摘Radiation-induced 1/f noise degradation in the LM117 bipolar linear voltage regulator is studied. Based on the radiation-induced degradation mechanism of the output voltage, it is suggested that the band-gap reference subcircuit is the critical component which leads to the 1/f noise degradation of the LM117. The radiation makes the base surface current of the bipolar junction transistors of the band-gap reference subcircuit increase, which leads to an increase in the output 1/f noise of the LM117. Compared to the output voltage, the 1/f noise parameter is more sensitive, it may be used to evaluate the radiation resistance capability of LM117.
文摘自动电压调节器(Automatic Voltage Regulator, AVR)的性能往往受到同步发电机高场电感和连续负载变化的影响,电力系统中参数的不确定性对于系统整体性能是一个重大挑战,在设计控制策略时需要重点考虑。线性自抗扰控制(Linear Active Disturbance Rejection Control, LADRC)的显著特点是能够实时估计和消除总扰动,并且不依赖于准确模型。在解决终端电压变化问题时,LADRC是一种可行的解决方案。探讨了三阶线性自抗扰控制器与高阶PID的关系,研究了线性自抗扰控制在AVR电压控制问题中的应用。针对目前AVR中普遍存在的定子电流限制(Stator Current Limit, SCL)问题,提出了一种补偿方案。方案引入发电机理论输出和实际输出的误差作为额外扰动输入,利用扩张状态观测器(Extended State Observer, ESO)对其进行估计,这样可以令线性自抗扰控制器快速补偿误差。仿真证明了与高阶PID相比,LADRC具有更强的抗干扰性,可以取得更好的控制效果。
文摘以设计输出电流为800mA的高稳定线性稳压器(low-dropout voltage regulator,LDO)为目标,利用工作在线性区的MOS管具有压控电阻特性,构造零点跟踪电路以抵消随输出电流变化的极点,并且采用了改进型米勒补偿方案使电路系统具有60°的相位裕度,达到了大输出电流下的高稳定性要求.另外,分析了电路在转换发生时电路结构参数和负载整流特性的关系,提出了一种能在瞬间提供大电流的转换速率加强电路,达到了在负载电流从800mA到10mA跳变时,输出电压的跳变量控制在60mV以内,并且最长输出电压恢复时间在500μs以内.芯片采用CSMC公司的0.6μm CMOS数模混合信号工艺设计,并经过流片和测试,测试结果验证了设计方案.
