Questions tagged [pre-charge]
7 questions
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Pre-charge for 230 V household appliances
Most common household appliances (TVs, LED drivers, etc.) have short inrush current (50-60 A). As I understand it is for charging input side capacitors. Can I use pre-charge system with resistor, to slowly charge the device? I need it because my AC…
Ri Di
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How do I implement precharge for a 24 V, 1 kW inverter?
In this circuit here I tried making a pre-charge circuit to start up a 24 V, 1 kW inverter which would draw 40 A of power so is this circuit good? Why keeping the MOSFET in the linear region is not a good idea?
Here is the graph I do need to start…
Hazardous Voltage
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Why is this precharge circuit not functioning?
Although this question sounds basic but, I have been trying to implement this precharge circuit to safely turn on the inverter without overloading the system, however especially when I powered it on, the relay turned on in no time(didn't seem the…
Hazardous Voltage
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Precharge Control for EV
I have a conventional precharging system consisting of a contactor and a resistor. What kind of way should I follow to control this with analog circuit elements in electric vehicles? Do you know a way? Or is there a sample project that I can review…
lmezis
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PCB design using SMD resistors for precharge
I want to redesign my precharge circuit. Currently I am using a bulky chassis mount resistor, which is adding an additional step in production.
Instead I have seen some precharge PCBs use a string of SMD resistors in series to achieve the same…
JoeyB
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What is a "snubberless" TRIAC? How does it compare to a standard device?
I was searching for a TRIAC to be used as part of a pre-charge circuit for large DC link capacitors, and found one (T435T-600FP) that is described as "snubberless". An on-line search did not find anything definitive, although it appears that they…
PStechPaul
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What amount of current (heat) can a pre-charge resistor handle?
I am designing a pre-charge circuit for an electric vehicle. I have a 50 W, 100 Ω resistor, and the capacitors in whole system are 1 mF in total. That gives me about 210 J of energy dissipated during the entire time of the precharge.
Would this fry…
Ri Di
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