Operating Power Supplies in Series 電源串聯(lián)工作

Although some users

are nervous about operating power supplies in series,

it is common practice in the industry.

The benefit is that voltages greater than 60V can be obtained using off-the-shelf

products.

盡管某些用戶對(duì)電源的串聯(lián)工作存在擔(dān)心，這在行業(yè)的使用中是一種普遍現(xiàn)象。其優(yōu)點(diǎn)在于，成品電源采用串聯(lián)方式可獲得超過(guò) 60V 的電壓。

It is possible to

connect several power supplies in series, but please read the precautionary

notes below:

可以將多臺(tái)電源進(jìn)行串聯(lián)，但請(qǐng)事先仔細(xì)閱讀以下說(shuō)明：

·

Connect back-biased

diodes across the power supply terminals as shown below.

·

如下圖所示，在電源輸出端子之間連接反向偏置二極管。

Output 輸出

Power

Supply 1 電源 1

Power

Supply 2 電源 2

Load 負(fù)載

Rate these diodes at the same output current as the power

supplies.

外加保護(hù)二極管的額定電流不得小于電源的額定輸出電流。

In the event both power supplies do not turn on at the

same time, or if the load becomes a short circuit, then the diodes will protect

the power supplies from any applied reverse voltage.

當(dāng)兩臺(tái)電源不是同時(shí)啟動(dòng)或者負(fù)載發(fā)生短路時(shí)，二極管可以保護(hù)電源免受外部任何施加的反向電壓的影響。

·

Do not

exceed the output to ground/chassis voltage rating. Inside most power supplies are noise filter

capacitors connected from the output to ground.

It is possible to exceed the operating voltage of those capacitors,

particularly when configuring several units in series.

·

請(qǐng)不要超出輸出到地/外殼的電壓允許值。大部分電源內(nèi)部都具有從輸出連接至接地端的噪聲濾波電容器。尤其是當(dāng)多臺(tái)電源串聯(lián)運(yùn)行時(shí)，這些電容器上的工作電壓可能會(huì)超出允許值。

·

Avoid

using “fold-back style” current limited power supplies as these may lock up the

power supply during initial switch on.

·

避免使用過(guò)流保護(hù)模式為“關(guān)斷式”的電源，因?yàn)榭赡軙?huì)在初次打開(kāi)時(shí)電源被鎖定。