巨磁阻在开关电源电流检测及保护中的应用

介绍了巨磁电阻传感器的工作原理和输出特性,给出了由NVE公司的AA系列巨磁阻传感器组成的开关电源电流检测及保护电路结构,分析了电流检测及保护电路的工作原理。与闭环霍尔电流传感器(LEM)组成的开关电源电流检测及保护电路比较,具有体积小、重量轻、测量电流范围宽、动作速度快等优点。电路的结构保证了在保护电路动作时,开关电源功率MOS管不会因为过流频繁开通、关断而损坏。     

基于电流反馈的IGBT有源栅极驱动方法研究

IGBT开关过程中di/dt与du/dt的大小决定着电流过冲、电压过冲和通断损耗的大小。为使IGBT稳定高效工作,提出一种基于di/dt和du/dt反馈的栅极驱动方法,在IGBT开通时,与di/dt成正比的可控电流反馈到栅极;同样,在IGBT关断时,与du/dt成正比的可控电流反馈到栅极。通过调节反馈到栅极的电流值,实现对di/dt与du/dt的控制,从而抑制尖峰电流和过压损坏的产生。仿真及实验结果验证了理论分析的正确性与可行性。     

一种新型的全桥电路副边过压抑制办法

由全桥移相电路出发,为解决副边整流电路存在的浪涌电压,研究了副边整流二极管关断时过电压的产生,通过对二极管关断过程的分析,提出使用可控饱和电感来抑制二极管反向恢复电流,达到抑制副边震荡,使二极管不会承受因震荡而产生的过压。     

高效率、降压式DC／DC变换器

功率MOSFET主要用途之一是用于电源。因为功率MOSFET作为开关管是十分理想：导通时导通电阻非常小，关断时漏电极小，并且可以工作于很高的频率。由DC／DC控制器及功率MOSFET组成的DC／DC变换器应用十分灵活。用功率MOSFET也可组成线性稳压电源，它具有极小的压差，可以说可做成超低压差线性稳压器。     

微封装功率MOSFET应用连载(八) 高效率、降压式DC/DC变换器

功率MOSFET主要用途之一是用于电源。因为功率MOSFET作为开关管是十分理想:导通时导通电阻非常小,关断时漏电极小,并且可以工作于很高的频率。由DC/DC控制器及功率MOSFET组成的DC/DC变换器应用十分灵活。用功率MOSFET也可组成线性稳压电源,它具有极小的压差,可以说可做成超低压差线性稳压器。本文介绍用Si9430功率MOSFET与DC/DC控制器MA×1649/MA×1651     

一种新型降压型ZVT-PWM变换器的研究

研究软开关技术能够有效改善功率,降低开关损耗,提高变换器的效率.为了减少电路的整体能耗,提出采用降压型ZVT-PWM变换器.把谐振元件从主功率通道中移开,利用并联的辅助开关回路,使主开关管在开通之前两端电压降为0,实现零电压开通.谐振元件不通过负载电流,使负载对谐振过程的影响减到最小,大大降低了开关损耗.同时,辅助开关管实现零电流关断,二极管的反向恢复也受到控制,减少了电路中谐振回路通态损耗.对电路一个周期内的每个工作模态进行了详细的分析,并进行仿真,证明了电路的可行性和分析的正确性.     

基于电压比较器的固态功率控制器驱动保护电路研究

研究了基于电压比较器的固态功率控制器驱动保护技术原理,设计了降栅压保护电路。通过设置降栅压保护电路的输出电压值和电压上升/下降的速度,实现了对MOSFET栅极电压的控制和对负载在过流或短路时的及时保护功能。解决了现有技术中使用稳压二极管判断过流门限电压,导致对MOSFET栅极电压的控制精度不高和受保护MOSFET在一个时延内反复开通/关断的问题。经过电路分析和仿真实验,结果表明降栅压保护电路可以在45μs内对短路负载进行关断保护。     

一种新型小功率臭氧发生器电源

介绍了小功率臭氧发生器电源的整体设计思路。电源为半桥逆变拓扑,采用功率MOSFET作为开关管器件,针对小功率使用领域使用电流互感器电路驱动MOSFET。提出了一种结构简单的控制电路,成功应用于臭氧发生电源中,获得了实验数据和波形。该电源结构简单,经济实用,具有很强的实用价值。     

一种新型的BOOST ZCT-PWM变换器

针对典型的Boost ZCT-PWM变换器中存在的主开关管并非零电流开通的问题,对原有电路做了改进,提出了一种新的拓扑结构和控制方法,实现了主开关管的零电流开通和关断,改善了变换器的工作状况,降低了开通损耗。仿真结果表明,这种新型的改进电路确实达到了预期的效果。     

基于PWM控制的机载固态功率控制器仿真研究

设计了一种基于PWM控制的固态功率控制器,使得其对大电容负载开通时的电流抑制和短路保护时,MOSFET均处于开关状态,降低了MOSFET损耗,提高了系统可靠性;用Saber软件建立了仿真模型,进行了仿真验证,对该固态功率控制器在高可靠性的机载高压直流电源系统的应用提供了理论依据和设计方法。     

一种改进的串联电池组单体电池电压测量方法

针对基于运算放大器和MOSFET管的串联电池组单体电池电压测量方法存在漏电流的问题,提出了一种改进的电压测量方法。在每节电池的两端增加了一个电压跟随器,可有效降低漏电流;增加了光电继电器作为运算放大器的电源开关,使电压测量电路在断电状态下不消耗电流;增加了一个稳压二极管,以防止MOSFET管被击穿。测试结果验证了改进方法的有效性。     

基于功率MOSFET的激光器外触发系统研制

采用功率MOSFET及其驱动器和光纤收发器件,研究了激光触发开关脉冲功率源控制技术中的快上升沿(≤5ns)触发信号产生、驱动、传输及光纤隔离、高耐压脉冲变压器使用等关键技术。给出了激光器外触发控制电路的设计及测试结果,并对其应用特点进行了分析和讨论。     

Design of a non-inverting synchronous buck-boost DC/DC power converter with moderate power level

This paper presents the design of a non-inverting synchronous buck-boost DC/DC power converter with moderate power level for a solar power management system. The buck-boost requirement arises from the rapid changes in the atmospheric condition or the sunlight incident angle. The system mainly consists of the non-inverting synchronous buck-boost DC/DC power converter, MOSFET drivers, anti-cross conduction logic circuitry, feedback compensator, and PWM regulator. The system is capable of converting the supply voltage source to higher and lower voltages to the load terminal with voltage polarity unchanged. The voltage at the load terminal is controlled by continuously adjusting the duty cycle of the PWM regulator. Application of the buck-boost converter in battery management system design is also addressed.     

Low power high-speed multithreshold voltage CMOS bus architectures

Low power, high-speed bus architectures, based on low swing voltage technique, using multithreshold voltage transistors are proposed in this paper. Three different classes of driver/repeater/receiver circuits are introduced. The driver circuits are comprised of high threshold voltage MOSFET transistors, in order to reduce their output swing level voltage. For re-pulling up the low swing voltage to full swing, innovated high-speed, cross-coupled latch, voltage receiver circuits are used. In applications having high load capacitance due to long interconnections, novel repeater circuits based also on multithreshold voltage technology are introduced. Using 0.5 μm multithreshold voltage process technology and 1 V supply voltage, SPICE measurements showed up to 45% improvement in the power delay product.     

基于555定时器的开关电源的设计

提出了一种中小功率开关电源设计,该电源是用555定时器等组成的脉宽调整电路构成稳压源。主要介绍了开关电源的主要组成部分的原理图及设计、555定时器及有其组成的脉宽调整电路和功率MOSFET管。此电源电路结构简单,功耗小,控制线性好,稳压范围宽,能实现较好的控制,输出电压在(3～20)V连续可调,电流0～5A。     

自复位式大电流热保护器测试装置

论文开发了一种热保护器性能检测装置。装置利用霍尔传感器检测电流的大小,控制大功率MOSFET的通断,从而精确测试0～200A热保护器的闭合持续时间,并在人机界面及现场仪表上显示测试结果。     

Dynamic power stabilization model for improved conduction and switching loss using boost rectifiers

The power stabilization is the key issue considered in electric circuits in recent days. The growing use of electricity increases the requirement of stabilized power supply to the devices. Towards this, various stabilization models are presented earlier with different converters and rectifiers. However, they suffer to produce high stabilized power supply to the circuits and devices. To improve the performance, an efficient dynamic power stabilization model with reduced conduction/switching loss is presented in this paper. Initially, the converter switches the incoming voltage in the series of conductors and maintains the output voltage. Consider the incoming voltage is IV_i, then it has been regulated through a series of diodes and capacitors. At each parallel circuits, there exists a diode and capacitor which is capable of storing incoming voltage and enables to boost of the incoming voltage to step up to produce a higher voltage. A MOSFET is designed to control the output voltage to produce a steady voltage supply. It maintains the incoming and output voltage from different diodes. Based on the required voltage level, it triggers the conditions and triggers the circuits to maintain the voltage stability. As the MOSFET attached to the circuit maintains the conditions of capacitors and inductors in the previous cycle with the voltage available in each component, it performs power stabilization approximation, and according to that, a set of series circuits are switched to produce steady voltage. The parallel circuits are activated only when the input voltage is up to the required output voltage. Otherwise, the series circuit has been triggered to produce output voltage at the required level. Each series circuit has been embedded with a capacitor which is capable of storing incoming voltage and boost them to the higher voltage. The proposed method has increased the efficiency of boost rectifiers and produced efficient results than previous methods.     

Active power filter using nonlinear repetitive controller

Active power filters as solutions to power quality problems have become more and more important nowadays. A nonlinear repetitive controller for current control of active power filters is proposed. The proposed method is composed of a repetitive controller and a deadband relay. Whenever the input error is above the threshold, the current control loop is driven dominantly by the deadband relay to obtain fast dynamic response. After the input error is below the threshold, the deadband relay automatically turns off and the repetitive control alone governs the current control to eliminate the steady-state error. Discussions on the design of the current and voltage control loops are also given. Simulation and experimental results verified the feasibility of the proposed method.     

DC/DC开关电源模块并联供电系统均流控制研究

介绍了由两个DC/DC开关电源模块并联构成的供电系统电路结构和工作原理。该系统采用ARM芯片STM32为主控芯片产生驱动功率开关器件MOSFET的PWM脉冲[1],对供电系统的输出电压和各个模块的输出电流均实现了全数字闭环PI控制。系统输出电压稳定,能实现两个模块电流的比例分配,同时具有输出负载短路及延时恢复功能。仿真和实验结果验证了控制技术的正确性和可行性。     

基于逆变器输出串联拓扑结构的氦氖激光器高压电源

设计了一种逆变器输出串联拓扑结构的氦氖激光器高压电源,并对电压电流双环控制策略进行了讨论。仿真和实验结果表明,该氦氖激光器高压电源满足了激光管点亮和正常工作的要求,并且能够实现自动稳流,在激光管加速寿命实验中有着重要的意义。