Electronics > Projects, Designs, and Technical Stuff
Very wide range input power supply
NiHaoMike:
Here's an interesting design puzzle of a power supply:
Input: Up to 520V DC, 320-400V typical operating, minimum as low as practically attainable. Minimum startup voltage should also be as low as practically attainable.
Output: CVCC 9-12V or 12-16V for charging 3S or 4S battery, maximum current up to 20-30A if input voltage 300V or higher, below that output current drops accordingly. Both voltage and current limits would be programmable by external controller.
Efficiency: 85% or better when input voltage in typical operating range and output current is 4A or more up to 80% of maximum.
Other considerations: If input power is insufficient for sustained operation, repeated startup attempts must not damage supply.
The application is an auxiliary power supply for a solar power control system. I'm thinking it would make sense to modify an ATX PSU (with active PFC) for that application, but extending the maximum input voltage to 520V seems a bit problematic.
Neomys Sapiens:
Also for you: Microchip LR8K4. ;D
see here:
https://www.eevblog.com/forum/projects/high-voltagelow-current-power-supply/msg3006370/#msg3006370
Sorry - did not see the 4A requirement. Proposal without sense.
David Hess:
Universal input ATX power supplies can operate from 340 to 130 volts DC so in theory adding a simple inverter to convert 520 volts DC to 340 volts DC could work and allow operation down to 200 volts DC however I would not trust any ATX power supply to operate under adverse conditions like low input voltage or current limiting.
That leaves designing something like an ATX power supply without the active power factor correction stage and including both input and output current limiting. I would also include shutdown for high and low input voltages. For safety, I would include galvanic isolation from input to output in excess of that required for 240 volt AC applications; DC can be nasty. Maybe it would be better to convert down to a standard low voltage like 48 volts DC and then implement or use an existing charger.
SiliconWizard:
Not sure what kind of solution you're looking for exactly. Full design? Well, if you're thinking of reusing/modding an ATX PSU, I guess power modules could be acceptable too.
Vicor comes to mind. http://www.vicorpower.com/dc-dc/isolated-regulated
They have modules with 9V – 420V input.
520V, couldn't find anyting, but you could think of adding a front-end to one of those, or something.
Marco:
I doubt you're going to save any time trying to modify something existing. First you have to DIY most of the high power DC input, then you have to do the CVCC control part. Between those you could probably DIY it entirely.
No experience with it, but since you don't need isolation how about a resonant switched capacitor step down converter? No transformer needed.
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