Operating Power Supplies in Series 电源串联工作

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.

尽管某些用户对电源的串联工作存在担心，这在行业的使用中是一种普遍现象。其优点在于，成品电源采用串联方式可获得超过 60V 的电压。

It is possible to

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

notes below:

可以将多台电源进行串联，但请事先仔细阅读以下说明：

·

Connect back-biased

diodes across the power supply terminals as shown below.

·

如下图所示，在电源输出端子之间连接反向偏置二极管。

Output 输出

Power

Supply 1 电源 1

Power

Supply 2 电源 2

Load 负载

Rate these diodes at the same output current as the power

supplies.

外加保护二极管的额定电流不得小于电源的额定输出电流。

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.

当两台电源不是同时启动或者负载发生短路时，二极管可以保护电源免受外部任何施加的反向电压的影响。

·

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.

·

请不要超出输出到地/外壳的电压允许值。大部分电源内部都具有从输出连接至接地端的噪声滤波电容器。尤其是当多台电源串联运行时，这些电容器上的工作电压可能会超出允许值。

·

Avoid

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

power supply during initial switch on.

·

避免使用过流保护模式为“关断式”的电源，因为可能会在初次打开时电源被锁定。