UPS简介,IGBT在UPS中的应用 DC/AC逆变器,BOOST升压电路,AC/DC整流,充电电路 防止IGBT损坏措施
上传时间: 2013-12-03
上传用户:ly1994
设计了一种以UC3863芯片为核心控制芯片的开关电源,其电路采用半桥结构的LLC谐振电路,带有PFC电路,且整个电路设计有自限流功能。分析了LLC谐振变换器整个电路的工作原理及自限流功能的实现。结合交流220 V输入1KW输出电路,分别对PFC电路和主电路进行仿真,仿真结果验证了该设计的可行性。
上传时间: 2013-10-13
上传用户:sdfsdfs1
随着功率开关器件的发展,电力电子装置日益小型化和高频化,电气性能大幅提高,但是随之产生的高次谐波却对电网造成严重污染。在电力电子设备中,整流器(AC/DC变流器)占有较大的比例,是主要的污染源。由于固态感应加热电源对于电网呈现非线性特性,从电网中输出的电流就不是标准的正弦曲线。高频谐波电流对电力设施产生过热或其他危害。 Boost电路应用到功率因数校正方面已经较为成熟,对于几百瓦小功率的功率因数校正,常规的电路是可以实现的。但是对于大功率诸如感应加热电源,还存在很多的实际问题。为了解决开关器件由于二极管反向恢复时产生的冲击电流而易损坏的情况,减少开关器件在高频下的开关损耗,本文采用一种无源无损缓冲电路取代传统的LC滤波电路。在分析了软开关电路的工作原理以及逆变模块的分时-移相功率控制策略后,应用Matlab软件进行了仿真,并通过实验结果验证了理论分析的正确性。
上传时间: 2014-12-24
上传用户:RQB123
01:开关电源的带宽是不是越高越好? 02:为什么PFC的带宽要控制在10~20Hz? 03:用UC3842~45控制的开关电源,其限流点为什么会随输入电压变化? 04:开关电源的带容性负载能力是不是越大越好? 05:在峰值电流控制中,当占空比大于0.5时,为什么要加斜波补偿电路? 06:两个完全稳定的开关电源,组成系统时,为什么会产生振荡?
标签: 开关电源
上传时间: 2013-10-21
上传用户:qingzhuhu
功率因数自动补偿控制器是用于低压配电系统进行无功功率补偿的专用控制器,可以与电压等级在400V 以下的静态电容屏(柜)配套使用。输出路数有6、8、10、12 四种规格。产品符合GB/T15576-2008 国家标准,具有功能完善、运行稳定可靠、控制精度高等特点。功率因数自动补偿控制器具备RS485 通讯接口,其所采样得到的电压、电流、频率、有功功率、无功功率、谐波含量、功率因数、温度可通过通讯接口传送到其它外部设备。具备过电压保护、欠流锁定、电网谐波过大保护功能。
上传时间: 2013-11-19
上传用户:ewtrwrtwe
DC/DC 升压IC:The FP6291 is a current mode boost DC-DC converter. Its PWM circuitry with built-in 0.25 Ω power MOSFET make this regulator highly power efficient. The internal compensation network also minimizes as much as 6 external component counts. The non-inverting input of error amplifier connects to a 0.6V precision reference voltage and internal soft-start function can reduce the inrush current. The FP6291 is available in the SOT23-6L package and provides space-saving PCB for the application fields.
上传时间: 2013-11-07
上传用户:3294322651
A number of conventional solutions have been available forthe design of a DC/DC converter where the output voltageis within the input voltage range—a common scenarioin Li-Ion battery-powered applications—but none werevery attractive until now. Conventional topologies, suchas SEPIC or boost followed by buck, have numerousdisadvantages, including low effi ciency, complex magnetics,polarity inversion and/or circuit complexity/cost. TheLTC®3785 buck-boost controller yields a simple, effi cient,low parts-count, single-converter solution that is easyto implement, thus avoiding the drawbacks associatedwith traditional solutions.
上传时间: 2013-10-21
上传用户:ljt101007
Video cable driver amplifi er output stages traditionallyrequire a supply voltage of at least 6V in order to providethe required output swing. This requirement is usuallymet with 5V supplies by adding a boost regulator or asmall local negative rail, say via the popular LT®1983-3.Such additional circuitry is unnecessary in typical 1VP-Pvideo connections, such as HD component video, if thecable driver amplifi ers simply offer near rail-to-rail outputcapability when powered from 5V.
上传时间: 2013-11-16
上传用户:yanyangtian
Linear Technology’s DC/DC step-down μModule®regulators are complete switchmode power supplies in asurface-mount package. They include the DC/DC controller,inductor, power switches and supporting circuitry.These highly integrated regulators also provide an easysolution for applications that require negative outputvoltages. In other words, these products can operate asinverting buck-boost regulators. As a result, the lowestpotential in the circuit is not the standard 0V, but –VOUT,which must be tied to the μModule regulator’s GND. Allsignals are now referred to –VOUT.
上传时间: 2013-10-22
上传用户:ztj182002
v开关电源拓扑结构综述 v开关电源分类 v非隔离式拓扑举例 BUCK BOOST BUCK-BOOST v隔离式拓扑举例 正激式 反激式
上传时间: 2013-10-12
上传用户:manlian