家用功放机大都采用环形变压器供电。环形变压器有漏磁小、转换效率高、频率响应宽等特点,可以提高功放机音质。如果环形变压器烧坏,又买不到原配型号来替换,那只有采取手工绕制的方法来复制。下面介绍手工绕制的方法。
标签: 环形变压器
上传时间: 2013-10-29
上传用户:alan-ee
随着电力电子技术的发展和电力电子元器件制造水平的提高,中频感应加热技术日臻完善。中频感应加热以其便捷高效的加热性能正逐步取代煤、油等燃料加热而成为工业加热的首选方式。作为感应加热装置的电源,KGPS(晶闸管静止变频装置)与传统BPS机组(中频发电机组)相比,负载适应性强,效率高,易于形成自动加热线,已在工业加热领域得到越来越广泛的应用。
上传时间: 2014-01-06
上传用户:dave520l
变频器功能参数很多,一般都有数十甚至上百个参数供用户选择。实际应用中,没必要对每一参数都进行设置和调试,多数只要采用出厂设定值即可。但有些参数由于和实际使用情况有很大关系,且有的还相互关联,因此要根据实际进行设定和调试。
上传时间: 2013-11-01
上传用户:lty6899826
6N137的结构原理如图1所示,信号从脚2和脚3输入,发光二极管发光,经片内光通道传到光敏二极管,反向偏置的光敏管光照后导通,经电流-电压转换后送到与门的一个输入端,与门的另一个输入为使能端,当使能端为高时与门输出高电平,经输出三极管反向后光电隔离器输出低电平。当输入信号电流小于触发阈值或使能端为低时,输出高电平,但这个逻辑高是集电极开路的,可针对接收电路加上拉电阻或电压调整电路。
上传时间: 2014-03-24
上传用户:skhlm
本文介绍了一种使用一片串行RAM交换器的双CPU的电力直流电源控制器,使用双CPU可以减轻单个CPU的负担,同时也大提高了整个直流电源系统的可靠性,文中给出了一种完全隔离的RS-232和RS-485串行接口电路。
上传时间: 2013-12-16
上传用户:稀世之宝039
提出一种基于凌阳单片机的步进电机加减速的控制方法。采用凌阳科技推出的16位结构工控单片机SPMC75F2413A为控制器,由Allegro公司生产的两相步进电机专用驱动器件SLA7042M构成步进电机的驱动电路,在传统的3段直线加减速控制算法基础上增加至7段S形曲线加减速过程,控制步进电机的启动和停止。实验结果表明,该控制方法克服了直线加减速中不连续、易造成系统冲击的问题,整个系统实现柔性控制,电机启动、停止连续性能提高30%。 Abstract: The method of controlled stepping motor is referred based on SPMC75F2413A MCU, which adopts the 16 knots SPMC75F2413A MCU as the controller. The SPECIAL-purpose actuation chip SLA7042M of two stepping motor produced by Allegro Corporation constituted to actuation electric circuit. The purpose of increasing to seven section of S shape curve based on the traditional three sections of straight line is to control the start and stop process of stepping motor. The experimental results show that the control method solves easy to pull-out and overshot problems. The overall system realizes flexible control, and the performance of motor start or stop continuity is increased 30%
上传时间: 2013-12-08
上传用户:jiangfire
介绍了电力操作电源与智能电池巡检系统的特点,给出了一种基于超低功耗单片机MSP430 F149针对中小型变电站自动化运行的专用设备的基本设计原理及实现方法,最后给出了详细硬件构成和软件实现。该系统能满足中小型变电站安全、可靠、自动运行的要求,并通过与上位机的串行通信实现变电站的远程管理和控制。 Abstract: The characters of the intelligent battery data logging system of the electric operation power are introduced.The basic design principle and the implemented methods of the SPECIAL equipment which only designed for the middle or small transformer substation based on MSP430F149 are prescribed. Finally, the hardware block diagram and the software flow chart are also given. The function that the system finally needs to realize can basically meet with the middle or small transformer substation’s satisfy, reliably,and automatic running.And it can also realize the transformer substation long-distance management and control by serial communicating with the host computer.
上传时间: 2013-11-25
上传用户:黄华强
笔者读了本版有关PIC 8位单片机的产品性能和相应的封装引脚介绍后,认为对初学者而言还需了解各引脚符号的意义,才能进一步学习和使用它。笔者为此作相关的说明,以便和初学者共同提高。
上传时间: 2013-11-07
上传用户:a67818601
NXP Semiconductor designed the LPC2400 microcontrollers around a 16-bit/32-bitARM7TDMI-S CPU core with real-time debug interfaces that include both JTAG andembedded Trace. The LPC2400 microcontrollers have 512 kB of on-chip high-speedFlash memory. This Flash memory includes a SPECIAL 128-bit wide memory interface andaccelerator architecture that enables the CPU to execute sequential instructions fromFlash memory at the maximum 72 MHz system clock rate. This feature is available onlyon the LPC2000 ARM Microcontroller family of products. The LPC2400 can execute both32-bit ARM and 16-bit Thumb instructions. Support for the two Instruction Sets meansEngineers can choose to optimize their application for either performance or code size atthe sub-routine level. When the core executes instructions in Thumb state it can reducecode size by more than 30 % with only a small loss in performance while executinginstructions in ARM state maximizes core performance.
上传时间: 2013-11-15
上传用户:zouxinwang
针对传统测温元件(热电偶、热电阻)组成的温度测量电路复杂,软件调试繁琐等缺点,设计基于MSC-51单片机及ADC0809的温度采集控制系统。该系统利用单片机中空余的I/O接口,以中断的方式实现温度的实时采集与控制,充分利用CPU的资源空间,简化了测量电路以及程序调试的复杂过程,方便了技术人员在实际中的开发和应用。
上传时间: 2013-11-06
上传用户:taozhihua1314