a****y
发帖数: 255 | 1 只是好奇, 有人知道现在的LAPTOP的AC ADAPTER怎么设计的吗? 现在的是AC输入是220V
和110V都可以, 然后输出是+16V 或+19V等. 难道是变压器降压后, 变直流电压, 然后
用带标准电压的Low-dropout (LDO) Linear REGULATOR完成电压的控制吗? | f*****0
发帖数: 489 | 2 they are typically switching regulators: rectifying ac into dc and then
lowered it to the desired voltage, in order to reduce weight/size and
improve efficiency.
they are typically isolated so use the fly-back topology. | a****y
发帖数: 255 | | g******u
发帖数: 3060 | 4 你只要拆过一个就知道了。一般都是universal input, rectifier, 一个flyback, 可
以用voltage或current mode pwm controller, 基本用不着microcontroller. 有时会
有一个secondary stage synchronous rectifier,加个optocoupler.
一般regulator带不了这么大电流。 | g*****g
发帖数: 3623 | 5 http://www.powerint.com/
give you some idea how this kind of device works..
220V
【在 a****y 的大作中提到】
: 只是好奇, 有人知道现在的LAPTOP的AC ADAPTER怎么设计的吗? 现在的是AC输入是220V
: 和110V都可以, 然后输出是+16V 或+19V等. 难道是变压器降压后, 变直流电压, 然后
: 用带标准电压的Low-dropout (LDO) Linear REGULATOR完成电压的控制吗?
| f*****0
发帖数: 489 | 6
those switching model power supplies are all regulators in the sense that
they have a feedback loop to maintain the (relatively) constant output
voltage.
a linear regulator would not have worked for this wide of an input voltage
range due to excessive power dissipation.
and the use of a (mains) transformer would be too bulky / heavy.
【在 g******u 的大作中提到】
: 你只要拆过一个就知道了。一般都是universal input, rectifier, 一个flyback, 可
: 以用voltage或current mode pwm controller, 基本用不着microcontroller. 有时会
: 有一个secondary stage synchronous rectifier,加个optocoupler.
: 一般regulator带不了这么大电流。
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