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18 Threads found on edaboard.com: Input Surge Current
Define input and output voltage, max avg and surge current at present and desired response time and current limit. Or define the circuit and load which causes the surge.
Protection depends on environment, such as exposure to 2kV ESD with 1ns rise time. There are internal Schottky diodes to both rails so it may be redundant. Usually a 1~10M to ground on input in case of disconnected source.then a series current limiter 10k for surge spikes up to 10kV for 1mA drops negligible voltage for typical 20 nA (...)
You need to define your environment. If the car battery is inside a car then the automotive specs are quite stringent such as -24V to +48? and a high Joule load dump rating to simulate the large inductive load from the electric clutch in an ACU, which can be easily protected with an MOV disc. If the input voltage drops to 0V with low impedance
what is the difference between Maximum Gate Trigger current and surge current Rating ? These are the damage levels for peak input and output current levels. how to know current gate that will hold? THat's called (LOAD) Holding current , IH which has a NTC coefficient and is
One needs to know; input DC voltage range Output avg. AC voltage range Power Factor of load and peak current demand of load ( e.g. if nonlinear rectified AC to DC, peak current can be 3x~10x Avg. ) or motor surge can be 5~8x Average ) Thermal resistance of your mechanical heatsink design Rca=1 to 3 deg/w if forced air cooled
I really want to know the importance of the high uf capacitors across the voltage supply of H bridge inverter. I have worked with and without them but am unable to find a difference in performance of the two situations. Please kindly put light on this question.
I suggest a different method to design a ruggedized off-mains switcher. First provide it with surge immunity as required by IEC61000-4-5, e.g. by Varistors or TVS diodes. I assume the circuit won't have problems with input filter ringing after it. The quoted "active inrush current protection" is intended to reduce periodic peak (...)
5 then 4 then 1 2 if there has been a surge on the ac input if a capacitor of the secondary has a drop in capacity, or a high in esr, then the smps stops functionning and sometimes this high esr destroys the main switching mosfet.
Hi, i need to protect a circuit input from inverser polarity feed without any meaningful voltage drop. I was thinking on the basic parallel TVS diode with a fuse and filter capacitor so i will get an extra surge protection and filtering. At a normal operation the circuit will powered by a 12V supply with a peak current of 14A, but a (...)
Hi, I have used the LM2700 to boost a 5v supply to 12v (currently using a laboratory power supply). The behavior is fine but when the load needs a surge of current (1A), the input and output voltage drops significantly. Will like to ask if there's any workaround to give a short current boost when needed. (...)
Hi We are working on a metering project in which we take 3 phase AC input.. we have used LVM2P-015R10431 protection device... the protection is working fine the circuits remains safe when surge comes in but it doesn't reset automatically until done manually by removing power...
At a limited input voltage range - say 200..240V~ - you could use a capacitive current limiting with a ≥ 400V rated X- or Y-capacitor of about 0.15?F + bridge + surge-limiting protection resistor. This would avoid the power dissipation of >2W. If all you are doing is driving LED of an optocupler, i suggest you u
1) the surge is applyed between the input AC lines. 2) 4kV surge discharge can be applied between FC-line and the output of device as an isolation test. in this case may be 2 mistakes: a) the optocoupler is opens or closes during surge- so device have no power supply. b) you have bad grounding - so the (...)
Dear I think the purpose of 100 ohms resistors at the input lines is for surge protection or high current protection purpose. The capacitor C1 maybe there for high inrush current or surge current because u expect very high DC voltage to be available after the bridge rectifier at the (...)
The input filter capacitor draw the high initial current, at switch on time it is inrush current(surge current). to limit this current use a NTC thermistor. :D
My power supply failed in EMC EFT and surge testing. Need to put in a varistor to help clamping the voltage. Please advise on varistor selection for this applicatoin. Being puzzled about "max clamping voltage", "peak surge current" etc, I don't know how to choose. My ps work in 230V 50Hz and has a maximum input DC voltage of (...)
8) In the boost topology it is not possiible to give current limiting in the output without adding one more Switching element in series with the output. current can only be limited in the main switching element of The boost converter. If you are asking about input surge current limiting u can use a big (...)
Are not many. 1. Euro EMC standards can be met. EMC is highest in high current loop, the switch, catch-diode, and LC filter. Keep this loop between these components as short as possible. Inductor must be shielded. You wont have any compliance problems. 2. Line surge's....use a transorb to protect your input. Should equal max (...)