电脑水冷抽水泵控制电路,（pump controller）Computer water cooling pump control circuit

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电脑水冷抽水泵控制电路

本文来自下面的连接：http://www.turbokeu.com/myprojects/pumprelay.htm

Description:

These simple schematics are well known by most of the watercoolers guys and are meant to power on the waterpump in a watercooled PC together with the power supply. I added a simple visualisation of the power to the pump by means of a led. This led circuit is actually the one on my AC-led page and shows if there's really mains voltage going to the pump (not just if the PC power supply is powered on). I made two versions of this circuit: One with a (cheap) electromagnetic relay and one with an (more expensive) solid state electronic relay.

Important: The LED D3 and the surrounding components (R1, C2, D2) are not needed for the schematic to work and can easily be left out or replaced by a 110V (US version) or 220VAC (European version) neon lamp.

Be aware also that these schematics involve mains voltages!

- With electromagnetic relay:

本文介绍了一种计算机水冷系统抽水自动控制电路，电路如下图，12V电源接电脑机箱电源输出口，当电脑电源打开时，继电器吸合，使水泵得电工作，关闭电脑时，继电器失电，继电器断开，水泵不工作。

下图中还给出了使用固态继电器的电路图，请参考。

电路中的S1为手动开关。

- With solid state relay:

The used solid state relay is a CX240D5 from Crydom and ordered from Digikey. It is rated for up to 5 Amps and 280VAC. The control voltage can vary from 3 to 15VDC.通过光耦感应控制水泵的开启。

There's one drawback: The minimum load current of the CX240D5 must be at least 60mA, in our case this is the sum of the pump current and the led current. The led current is about 20mA, so the pump must draw at least 40mA (under 110 or 220V).

To calculate the pump current: Pump current (Amps) = Pump power (Watts) / Mains Voltage (V)

For my Eheim 1250 pump this gives us: 28W/220V = about 127mA

For a european Eheim 1046 at 220V the pump current is 23mA, too little for the CX240D5. For a US 110V Eheim 1046 the current will be 45mA which is just fine.