100W的DCDC用哪种拓扑好?

LV.2

2006-03-02 09:17

请参考1141262232.pdf

LV.5

2006-03-02 09:21

对了,我忘了说了,我需要隔离的.

LV.2

2006-03-02 09:33

@yanglb

对了,我忘了说了,我需要隔离的.

你可用PWM+变压器,最好用同步整流.1141263185.pdf

LV.5

2006-03-02 09:41

@micon

你可用PWM+变压器,最好用同步整流.1141263185.pdf

多少钱?对了,你那个图里次级怎么有四个MOS管?还有,初级也有两个?是软开关吗?

LV.2

2006-03-02 09:42

@yanglb

对了,我忘了说了,我需要隔离的.

先生,有事请联络:wlluo0503@163.com

LV.2

2006-03-02 09:46

@yanglb

多少钱?对了,你那个图里次级怎么有四个MOS管?还有,初级也有两个?是软开关吗?

它的初级是有源钳位,次级是同步整流,效率90%以上

LV.5

2006-03-02 09:46

@micon

先生,有事请联络:wlluo0503@163.com

把相关资料发我邮箱里
yangliboli@163.com

LV.5

2006-03-02 10:13

有人做过吗?

LV.8

2006-03-02 10:21

@yanglb

有人做过吗?

有源箝位+单端正激就可以,效率应该在85%左右

LV.5

2006-03-02 10:32

@智慧大头

有源箝位+单端正激就可以,效率应该在85%左右

用什么IC控制?不需要同步整流吗?

LV.6

2006-03-02 10:43

Isolated is necessary?
If it is not necessary,a buck is suitable choice

LV.6

2006-03-02 10:46

@智慧大头

有源箝位+单端正激就可以,效率应该在85%左右

I think even a flyback topology,it is easy to make efficiency be 0.85.If SR is used,I think 0.90 efficiency is available.

LV.8

2006-03-02 10:47

@yanglb

用什么IC控制?不需要同步整流吗?

不到10A,不用同步整流也可,至于IC,很多的.

LV.6

2006-03-02 10:48

@yanglb

对了,我忘了说了,我需要隔离的.

Flyback is a good choice,0.85 efficiency is easy.If SR is used,I think 0.90 efficiency is available.

LV.5

2006-03-02 10:52

@superpowersupply

Flybackisagoodchoice,0.85efficiencyiseasy.IfSRisused,Ithink0.90efficiencyisavailable.

反激的话,用什么控制芯片?用384X可以吗?需要有源钳位吗?同步整流呢?

LV.5

2006-03-02 10:54

@智慧大头

不到10A,不用同步整流也可,至于IC,很多的.

做这个电路,正激和反激有什么区别吗?哪个更有优势?能给个有源钳位的电路参考一下吗?谢谢!yangliboli@163.com

LV.8

2006-03-02 11:00

@superpowersupply

Flybackisagoodchoice,0.85efficiencyiseasy.IfSRisused,Ithink0.90efficiencyisavailable.

用FLYBACK效率到0.9,没做过,不过输入24V恐怕实现起来不容易

asm

LV.8

2006-03-02 11:01

@yanglb

做这个电路,正激和反激有什么区别吗?哪个更有优势?能给个有源钳位的电路参考一下吗?谢谢!yangliboli@163.com

反激式不适合做大功率电源,它先要把能量存储在耦合电感里再释放.不象正激变换直接进行能量传输.

LV.6

2006-03-02 11:02

@yanglb

反激的话,用什么控制芯片?用384X可以吗?需要有源钳位吗?同步整流呢?

Yes,3843 series is available,If SR is used,0.9 efficiency is not difficult.

LV.8

2006-03-02 11:07

@asm

反激式不适合做大功率电源,它先要把能量存储在耦合电感里再释放.不象正激变换直接进行能量传输.

同意,

LV.5

2006-03-02 11:16

@智慧大头

同意,

但我看书上说反激可以做到150W的啊?难道书上是错的吗?

LV.5

2006-03-02 11:21

@superpowersupply

Yes,3843seriesisavailable,IfSRisused,0.9efficiencyisnotdifficult.

我用3842调了一个,但最大只能做到80W,而且MOS管烫的利害,是不是反激式很难做到100W的?还有就是我做的时候,从4脚引到3脚一个补偿,但引入以后感觉占空比不再变化.

LV.8

2006-03-02 11:23

@yanglb

但我看书上说反激可以做到150W的啊?难道书上是错的吗?

只是不适合,没有说不可以,个人认为大功率还是用正激好做

LV.5

2006-03-02 11:29

@智慧大头

只是不适合,没有说不可以,个人认为大功率还是用正激好做

没做过有源钳位,能给点参考吗?

LV.6

2006-03-02 11:36

@智慧大头

用FLYBACK效率到0.9,没做过,不过输入24V恐怕实现起来不容易

Because of the input voltage is not wild range,so high efficiency can realize easily

asm

LV.8

2006-03-02 11:46

@superpowersupply

Becauseoftheinputvoltageisnotwildrange,sohighefficiencycanrealizeeasily

Because input voltage is low,so high efficiency cann't easily.

LV.8

2006-03-02 11:47

@superpowersupply

Becauseoftheinputvoltageisnotwildrange,sohighefficiencycanrealizeeasily

他没说输入电压范围,如果是9—32V输入呢?

LV.6

2006-03-02 11:51

@智慧大头

他没说输入电压范围,如果是9—32V输入呢?

He said input voltage is 24V,I think 20V -30V is possible.
Those are other problems.Normally we say something are always under certain condition.
Without condition,nothing is impossible.
Do not you think so?

asm

LV.8

2006-03-02 11:55

@superpowersupply

Ithinkevenaflybacktopology,itiseasytomakeefficiencybe0.85.IfSRisused,Ithink0.90efficiencyisavailable.

Output voltage is 12V,SR don't need.