Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [over-current]

24 questions
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Overcurrent protection (at 4A 100V)

On the PCB I'm designing, the total power consumption might be as high as 86W (including output power), with supply voltage between 18 and 75V DC (it is OK not to allow full output power bellow 22V). So I'm fine with 4A max input current. I'm trying…
Sandro
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18650 Li-ion cell protection tripping at super low currents (~1 mA)

I recently bought a 3.7 V lithium-ion cell to replace an old 3.6 V NiCd one in a handheld vacuum cleaner. I am aware that Li-ion cells don't handle current surges nearly as well as NiCds do, and for that reason, I bought a protected cell. The…
ChemiCalChems
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Do power strips need to have a breaker?

In North America we commonly use power strips to connect equipment to the building. https://en.wikipedia.org/wiki/Power_strip I noticed that some power strips have a circuit breaker, and some do not. I have worked at facilities that required all…
BetterSense
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Super capacitor causing overcurrent protection

I'm making a power-supply circuit for some MCUs using a battery charging-discharging protect module MH-CD42 (both input and output is 5 V). The module's datasheet says it has a 0.3 seconds switch time when connecting or disconnecting the DC power…
Object Unknown
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Non-triangular/Incorrect (non linear) inductor current waveform for half bridge buck converter

I have a buck converter (Half bridge) as shown in the schematic below. (48V output). V_D goes to an external inductor. I have measured the inductor current for different loads (Nominal(upto 4A), Overcurrent(5 to 8A) and short circuit case(above…
Ishani Engineeŕ
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TC4056A shuts off at maximum volume (Bluetooth speaker)

I am trying to build a DIY Bluetooth speaker using a 18650 battery cell, a TC4056A battery charger board, an XY-016 that raises the voltage to 6.5 V, a 2200 μF capacitor, and a CSR8645 board. I am using two speakers rated at 5W, 4 Ω. The components…
Andrei-Eduard Lică
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Over Current/Short Circuit Protection Using op-amp and MOSFET

I wanted a circuit to limit the current to say 4A, and found this but it doesn't work in the Proteus simulator. What's wrong with this circuit? anyways to improve it? here is my expectation of the circuit: when the inverting input is higher then the…
mahyar
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Half-bridge driver IR2101 shorting high side and low side (In a weird condition)

I am making my own FOC BLDC driver, but there is a weird problem when I control the gate driver using PWM. I am using three IR2101 driver IC to drive the six N-FETs, and I am using an STM32 (Blue pill) to output a PWM signal to the driver. As I…
Dennis Chang
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Linear power supply - overload protection circuit

Summary and context: Several years ago I bought a linear power supply from Pyramid, model PS-3KX. I would like to understand in detail how the overload protection really works, as said by Pyramid manufacturer (red box in the Specification part). It…
EJE
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Implement adjustable overcurrent protection for DC current

I am designing a hobbyist's multi-fixed voltage channels using ATX PSU breakout. Of course the fixed voltages are 3.3V, 5V, 12V, and if possible, -12V too which are supported by ATX. Now I want to implement overcurrent protection for each…
slyx
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Configuring Overcurrent Protection – ST Microelectronics Motor Control Workbench

I have been working on a custom electronic speed controller I designed and built partly based on a reference design from ST Microelectonics; the STEVAL-ESC001V1. My board uses the same MCU, a STM32F303CBT7. I am having difficulty understanding how…
mike
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Connect LED to current limiter TPS259540 and control the current

I have an LED (ILH-ON01) with a forward current (IF) rating of 1 A. I want to operate this LED at a constant current of 1 A using a current limiter. The current limiter I have has a limit of 1.17 A and takes an input voltage of 14 V. To limit the…
Knowledge
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How and where to learn protective relaying for power systems?

I'm trying to learn protective relaying for power systems. More specifically, I want to learn how to calculate the settings that must be configured in the digital relays in order to build ANSI device functions, the ones described in IEEE Std…
A.Bukhari
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Circuit Protection: on-board vs off-board; manual vs auto. Which is better for our application?

RE: Circuit protection for small health & beauty product (for mass-production) similar to a foot spa whereby a portion of the user's body will come into direct contact with 1.5 gallons of water within the vessel. See original question link here: Do…
tayglo
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Understanding USB3.0 over-current detection circuit

I'm trying to understand how the following over-current protection circuit works: the way I understand this, as long as +VBUS_USB3_P0 = 5V and it's equal to +5V_ALW, there is no current current going through F2. but In over current situation,…
Firas Abd El Gani
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