英语翻译起码要读得通啊.The switching regulator operates the power devic

英语翻译
起码要读得通啊.
The switching regulator operates the power devices in
the full-on and cutoff states.This then results in either
large currents being passed through the power devices
with a low “on” voltage or no current flowing with high
voltage across the device.This results in a much lower
power being dissipated within the supply.The average
switching power supply exhibits efficiencies of between
70 to 90 percent,regardless of the input voltage.
Higher levels of integration have driven the cost of
switching power supplies downward which makes it an
attractive choice for output powers greater than 10 watts
or where multiple outputs are desired.
Basic Converters
Forward-Mode Converter Fundamentals
The most elementary forward-mode converter is the
Buck or Step-down Converter which can be seen in
Figure 1.Its operation can be seen as having two distinct
time periods which occur when the series power switch
is on and off.When the power switch is on,the input
voltage is connected to the input of the inductor.The
output of the inductor is the output voltage,and the
rectifier is back-biased.During this period,since there is
a constant voltage source connected across the inductor,
the inductor current begins to linearly ramp upward
which is described by:
这里公式免了
During the “on” period,energy is being stored within
the core material of the inductor in the form of flux.There
is sufficient energy stored to carry the requirements of the
load during the next off period.
The next period is the “off” period of the power
switch.When the power switch turns off,the input
voltage of the inductor flies below ground and is clamped
at one diode drop below ground by the catch diode.
Current now begins to flow through the catch diode thus
maintaining the load current loop.This removes the
stored energy from the inductor.The inductor current
during this time is:这里公式免了
This period ends when the power switch is once again
turned on.
Regulation is accomplished by varying the on-to-off
duty cycle of the power switch.The relationship which
approximately describes its operation is:
这里公式免了
where ∂ is the duty cycle (∂ = ton/(ton + toff))

这样翻译最好了.
开关稳压器的运行功率器件在
全和截止状态.这在当时的结果要么
大电流正在通过功率器件
与低“的”电压或电流流动不高
两端的电压设备.这样的结果是大大降低
正在消散权力范围内的供应.平均
开关电源效率的展品之间
70至百分之九十,无论输入电压.
更高层次的一体化驱动的成本
开关电源向下这使它成为
有吸引力的选择,输出功率大于10瓦
或在多产出理想.
基本转换器
前瞻性模式转换的基础
最基本的前瞻性模式转换是
降压或降压转换器可以看到在
图1 .其运作可以被视为两个不同的
这时期出现的一系列电源开关
是和关闭.当电源开关上,输入
电压连接到输入的电感器.那个
输出电感,输出电压,并
整流回来了偏见.在此期间,因为有
恒定电压源连接整个电感器,
在电感电流开始线性斜坡向上
这是描述的：
这里公式免了
在“关于”期间,能源是被储存在
核心材料的电感形式的通量.那里
是足够的能量进行存储的要求
负荷在下一期.
今后一个时期是“关闭”期间的电力
开关.当电源开关关闭,输入
电压的电感苍蝇地下,是钳制
在一个二极管低于地面的渔获二极管.
目前现在开始流经因此赶上二极管
保持负载电流回路.删除
储存能量的电感器.该电感器电流