Let me thank you for your time upfront for looking at this thread. I'm trying to design a purely analog circuit that operates as a multi chain "antifuse" if you will. It almost resembles a sequencer really, where every pulse will drive a different load. I need help in designing the control logic between the GND Switch and the Antifuse Switch. The input is always a solid DC voltage, usually at 9V, 12V, or 24V. The voltage is always present from the source, its the current that is pulsed as the load only activates with high current. Leakage current from the source is usually around 10mA, the load current needs to be at least 1A to operate, but can operate up to 9A as well on a short pulse. The first three diagrams show the states of the circuit before a pulse and after each corresponding pulse, to the Nth antifuse block. The 4th diagram was another idea I had about using a SPDT switch instead and putting the load on the low side.

Again, what I need help with is the logic control between the two switches and how to do that without any other power supply or digital component. Idea is to keep this a cheap as possible. Thanks everyone!

 

 

Welcome to AAC!

1. What happens after the second pulse?
2. What does the unlabeled configuration represent?
3. Is the input a current pulse or a battery?
4. Can the loads that are switched out have voltage applied to the high side? What I'm getting at is can ground just be switched to the loads?

 

Welcome to AAC!

1. What happens after the second pulse?
2. What does the unlabeled configuration represent?
3. Is the input a current pulse or a battery?
4. Can the loads that are switched out have voltage applied to the high side? What I'm getting at is can ground just be switched to the loads?

1. There can be a third pulse, 4th, and so on. In theory, each of those subblocks of a GND Switch and Antifuse Switch can be added or subtracted depending on how many loads are attached to the system. I don't necessarily need them to reset if power is removed completely. One time use is acceptable, resetable is fine too.

2. Unlabed configuration was just another idea I had to use a Power SPDT. Not sure I can find an SPDT that can handle 9A however.

3. The input current is a pulse. There is an entire circuit within the power supply that triggers a current pulse to activate the load. The 24V is constantly on and can test for continuity of the load with about 10mA.

4. Yes, loads can be switched highside or low side.