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--- sv-seeker-issue-comment [2023/12/10 09:07] – created mralvin
+++ sv-seeker-issue-comment [Unknown date] (current) – external edit (Unknown date) 127.0.0.1
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+Illustration from a solid state "relay" product
+{{:ssr:dc-dc-ssr.jpg?400|}}
+Power is going in at 'plus' and leaving at 'minus', at the "out" terminals of the Solid State Relay.
+And here is a simplified schematic of the internals of a DC-DC SSR
+{{:ssr:internal-dc-dc-ssr.jpg?600|}}
+Notice the diode inside the MOSFET symbol?  It goes from - to +
+The diode is a natural effect of the way a MOSFET is made, and not something that is put there as an extra ting.
+So I would say, try again, but this time with power going from + to - on the SSR's
+Sources: [[https://electronics.huimultd.com/Blog/How_to_wire_SSR/|How_to_wire_SSR - Point 4.1]]
+**After thoughts:**
+Since we are trying to make +24V available to the "-" out of the SSR, then the SSR must internally have a High-Side driver chip, that triggers the MOSFET Gate, as Gate voltage must be some 10V-15 higher than the "-" out side of the mosfet (the Vgs voltage).
+See also this image of a High-Side driver:
+{{:ssr:high-side_switching.jpg?600|}}
+Most likely the SSR will have an internal High-Side driver chip included in its belly.
+Sources2: [[https://www.infineon.com/cms/en/product/power/gate-driver-ics/high-side-drivers/|Infineon.com High-Side drivers]]