電腦水冷抽水泵控製電路,（pump controller）Computer water cooling pump control circuit

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電腦水冷抽水泵控製電路

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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:

本文介紹了一種計算機水冷係統抽水自動控製電路，電路如下圖，12V電源接電腦機箱電源輸出口，當電腦電源打開時，繼電器吸合，使水泵得電工作，關(guan) 閉電腦時，繼電器失電，繼電器斷開，水泵不工作。

下圖中還給出了使用固態繼電器的電路圖，請參考。

電路中的S1為(wei) 手動開關(guan) 。

- 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.通過光耦感應控製水泵的開啟。

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.