100A DC Solid State Relay

[abuhafss]

Hi

I am looking for a DC SSR circuit which could handle 100A at 12V, the input voltage to be 6-12V.

I have gone thru this thread https://www.edaboard.com/threads/274167/ but could not get the idea of the circuit.

 

[shaiko]

Do you need the device to be PCB mount?

 

[abuhafss]

No.

BTW, I am looking for a schematic please.

 

[shaiko]

In case an of the shelf device can help:
**broken link removed**

If you're looking to design one yourself:https://www.electroschematics.com/6267/do-it-yourself-solid-state-relay/

 

[Easyrider83]

Use smart power switches like BTS650 connected in parallel. I made a solid state starter relay for motorcycles 12V 200A on 10xBTS650.

 

[ahsan_i_h]

See the document titled "SSR Design Using VO1263"
Link: https://www.vishay.com/docs/81225/ssrvo126.pdf

 

[abuhafss]

Use smart power switches like BTS650 connected in parallel. I made a solid state starter relay for motorcycles 12V 200A on 10xBTS650.

Would you like to share your design and some photos, please.

 

[Easyrider83]

Would you like to share your design and some photos, please.

Sorry, can't. Project was commercial. But there was everything very simple. 10xBTS650 + week 1A 12V relay.

 

[abuhafss]

If you're looking to design one yourself:https://www.electroschematics.com/6267/do-it-yourself-solid-state-relay/

That schematic is for an SSR.

 

[betwixt]

SSR =Solid State Relay, which is what you asked for. However, as you have found, most SSR are used in AC applications where they inherently turn off when the control voltage is removed.

In a DC application, an AC circuit using a triac or SCR will not work unless you have a method of disrupting the current to turn them off. When turned on they will stay in the on condition until the current being passed drops below sustaining level which may be only a few mA.

If you want true relay operation where you use one voltage to switch another larger one, consider MOSFET or IGBT designs. All electronic relays will drop some voltage so be careful with heat dissipation at 100A.

Brian.

 

[Easyrider83]

BTS6143D 10mOhm resistanse
10 in parallel = 1mOhm
100A * 1mOhm = 100mV drop
100mV * 100A = 10W power loss
It is ok for 50x50mm board for 30s load without heatsink.