03.06.2014

Over voltage protection circuit dc dc converter

Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. All this circuit will do is prevent voltages of less than a half a volt or a volt from getting through. Your circuits (whether they work as you intend or not) seem to be based on the idea that when an over-voltage condition occurs, you will isolate the load with a MOSFET. So, if you try to isolate the load with a MOSFET, that just effectively increases the load impedance. A good way to picture it is if the zener is conducting with current flowing from cathode to anode, (which it will for DC inputs > 13V) replace it with a 13V battery with the negative terminal where the anode was and the positive terminal at the cathode and it will become clear that M1 will be driven to saturation.
Closer, but you will need some sort of hysteresis, otherwise as you approach the threshold you could get oscillation, or get the FET into the linear region. What you want to do first is Google "Over voltage protection IC", and then follow some links. Not the answer you're looking for?Browse other questions tagged mosfet protection zener or ask your own question. I received a CV from an agency but received it direct from the person first - where do I stand? Who invented the exponential ansatz for linear differential equations with constant coefficients? All cctv power supply box 12v wholesalers & cctv power supply box 12v manufacturers come from members. 12V 5Amps CCTV Power Supply Box 9 Channel , CCTV Camera Power Supply Quick Detail: -Absolutely Plug-and Play!
LED Security Camera CCTV Power Supply Box 60W , Waterproof Power Supply 12V Quick Details: 1. D5 could be a rotary switch with a array of different value zeners if adjustment is needed.


Hi, after checking the data sheets, it looks like the 74C series are about the same as the cmos 4000 series but are TTL compatible.
Hi, it looks like the 9 volt zener would have to replaced with a 18 volt zener.I just found this circuit, I have not tested it yet. For a great many things that might have led to your over-voltage fault in the first place, they will simply respond by increasing voltage even more. That blows the fuse, which isolates the power supply from the circuit, and does so much more effectively than a MOSFET can. If you apply 15VDC to the DC input yes the Zener will start to conduct, however this is a moot point since you have a large negative voltage from the gate to source of the PMOSFET. Just off the top of my head you could experiment with a resistor from the collector of Q5 to the base of Q2. We doesn't provide cctv power supply box 12v products or service, please contact them directly and verify their companies info carefully.
The ground at the opto-isolator has to be independent from the system ground for the mosfet to be able to fire.Can you post a drawing when you have the time. I was concerned with damaging the MPPT circuit so I just choose a value for D5 that did not exceed the max input VOC of the MPPT. Being TTL compatible is not needed for this application so the CMOS 4000 series should work as well. Due to package variations from suppliers, the product packaging customers receive may be different from the images displayed. If you put a short across the load, the voltage will be reduced (to 0V, for an ideal short).
Furthermore, the crowbar continues to conduct until there is no more energy which can result in a voltage across the load, which might take a little time, depending on just what caused the fault, and what reactive components are in the circuit. This will certainly drive it into saturation and DC IN will be connected directly to Protected DC with only Rds(on) between them.


If you don't want to spring a few bucks for the part, you can have a go at reverse engineering it. I am weeks away from adding the MPPT circuit to the project so there is a lot of time to find a solution.Thank you for the help. When you use bulk rates, a flat $1.70 registered air mail fee will automatically be added to your cart to ensure delivery of package. Were the load impedance lower, then more current would flow, providing a way to sink whatever excess energy there is without the voltage becoming too high. When a source-drain voltage is applied in excess of this, they go into breakdown and conduct (not unlike reverse breakdown of a diode). The overvoltage is very very rare situeation for me, but just in case I need a simple protection.
If it's little current and non-perfect regulation is needed then a Zener from GND to Protected DC might work.
Suggestions welcome.Over time I will be posting a more complete circuit and part lists of my MPPT circuit. I have to finish the pulse motor pendulum drive then I can start  working on the MPPT circuit. While BulkRate's intention is to offer cheaper prices when you buy in bulk, because it is priced separately it on occassions show a higher than retail price.



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