I’m building a circuit that involves the use of latching relays. In this circuit, the relay will switch between power supply A or power supply B, to my load.
To illustrate my case, let's say that power supply A is currently supplying current to my load, but I want to trigger a switch to power supply B. There are two possible implementations that I have thought of. I can use either capacitors or diode to ensure that my load continue to function in the event of a switch triggered by the relay. In the former, during the switching process, power supply B turns on, and both power supply A and power supply B will briefly overlap (thus the need for Schottky diodes for each, otherwise problems cause by competing DC power supplies ensue) before one is cut off by a relay, thus ensuring a smooth transition of power supply. The load remains unaffected. In the latter case, I envision a design where the (?)microsecond switch would be covered by a capacitor (or multiple capacitors) that ensures continual current delivery to my load, before power supply B takes over.
Given these two options, which should I use? I am thinking that in terms of power loss, diodes may cause more wastage than capacitors? Also, there might be abit of voltage drop if diode is used. Thus, I am inclined to use the capacitor approach. However, I am not very knowledgeable about this. I wanted to ask which would be the recommended option?