Questions tagged [leakage-current]

Leakage current is the current that flows from either AC or DC circuit in equipment to the chassis, or to the ground, and can be either from the input or the output. If the equipment is not properly grounded, the current flow through other paths such as the human body. This may also happen if the ground is inefficient or is interrupted intentionally or unintentionally. (www.sunpower-uk.com)

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37 views

Homebrew linear PSU leakage current/voltage origin

I made a 13.8V 10A linear power supply from a transformer took from a computer UPS whose battery was dead. Now the issue is when I touch the output of the regulator leads, or the power supply casing I ...
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36 views

True RMS earth leakage relay

The relay shown below [Link] claims to trip in less than 25 ms to fault currents that are 5 x greater than the set trip current. Also the minimum time settings are inst (what time is "inst") ...
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Gate leakage current for a JFET?

I'm really confused about how JFETs work. JFETS are usually significantly higher doped donor xor acceptor atoms. My professor mentioned that MOSFETs usually have an oxide in between the the metal and ...
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Where exactly earth current flows-SMPS/DC-DC and DC-AC

Ashamed to ask this question after having lot of experience in Converter designs. i always heard and learnt from Sr. Mentors that For better EMI performance we need to give path for conducted noise(...
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2answers
116 views

Guard Ring on a printed circuit board for a transimpedance amplifier

I'm trying to build a trans-impedance amplifier shown in the circuit below. However, with my op-amp of choice, the AD795, I'm a bit confused by their circuit board notes and how to implement them. The ...
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36 views

Metal casing makes ultrasonic humidifier unstable

I have a prototype setup, where an ultrasonic humidifier is controlled from a microcontroller (Teensy 3.2) through a power MOSFET to humidify the air passing through a metal container partially filled ...
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34 views

3 T Finfet Leakage reduction circuit techniques (VLSI)

What are the circuit techniques to reduce leakage in a 3T Finfet (front and back gate shorted) circuit? Vth in a 3T Finfet is almost always constant, so there is almost no stack effect and hence sleep ...
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Type A vs Type AC RCCB

I would like to install an RCCB at the electrical point that will power a few devices that are going to be in my fish pond. Documentation and general info online say that Type AC RCCB can work with ...
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39 views

Protecting equipment submerged in water against earth fault - RCCB vs MCB

I would appreciate help understanding the difference between an RCCB and MCB in the context of the situation I'm sharing below. I have a mini fountain pump in my pond which doesn't have any earth pin (...
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30 views

Simulation shows mystery leakage

Background: I am trying to design a battery powered gate opener, the basic concept is that if the uC switch is on the relay switches the motor on, but if the actuator gives a low feedback (gate is ...
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I am trying to measuring leakage current from motor and driver and identify which part contributes more leakage and then to improve it

From UL standard, if I only want to measure a part of device's leakage current to another part. I can just measure the Grounding wire. So I used a clamp on meter (0-10mA range) to clamp on grounding ...
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Very low voltage BJT behaivor

I'm interested in very low supply voltage boosting. 20-200mV, the lower the better. Usually such applications use zero threshold MOSFETs, but I'm curious if BJT will do the work too. In the datasheet,...
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P channel MOSFET unexpected current leakage

I am using a P-channel MOSFET to drive a load. My load is an bluetooth module consuming 6 uA (according to datasheet) in sleep mode. I am controlling the gate with the main MCU which is stm32l4. The ...
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56 views

How to consider Diode leakage current in a voltage divider circuit

I am trying to derive an equation to calculate voltage at ADC pin for below circuit: Initially, I have considered only ADC leakage current in my equation to calculate the voltage. During testing at ...
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Some of LEDs connected in series remain on

I know that even tiny leakage currents can make an LED glow weakly and there are many answers to similar questions, but my problem is different. I have 6 power LEDs connected in series and they are ...
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How can we detect leakage currents and open lines in a lithium ion battery module?

I’m doing ground work on building a bms prototype and I stumbled up on the fact that I know nothing about how to detect open lines and leakage currents. I’ve seen some ASICS doing the part but how ...
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192 views

What does voltage mean on a ground wire? (Neon-lamp screwdriver)

This question has some implications on home related work with mains. Never take what you read on the internet as the truth when lives might be in the line. That is how I'll be treating potential ...
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How to do the Leakage Current Test according to ULC S531 standard?

How to do the Leakage Current Test according to ULC S531 standard? I have a DC powered device which is about 24V. And I am curious about the Leakage Current Test according to the ULC S531 standard. ...
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66 views

LED ceiling light with mismatch driver [closed]

I am new to the forum, so please forgive me if I am asking a stupid question or posting the wrong thing at the wrong place. I recently bought a Led ceiling light online that comes with a remote ...
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281 views

Leakage Current in a AC/DC PSU without earth?

I'm looking at the data sheet for a Meanwell NPF-40 PSU. This is a class II unit and hence does not have an earth connection (see also mechanical specifications, page 6), yet the data sheet specifies ...
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Side-channel leakage and instruction types on microcontrollers

Since the end of 90s, it is known that side-channels (e.g. execution time, power consumption, electromagnetic emanations) of computation platforms can be analysed to recover information on data being ...
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2answers
147 views

Is capacitor leakage harmful? Polymer current leakage compared to electrolyte leakage

I choose an input capacitor for the LM2596 DC/DC converter. Since the device will be operated on the street (from -35 to +35°C), I decided to choose polymer capacitors, since they are not particularly ...
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63 views

What do the white and green colours on the earth leakage CB denote?

I've come across two 4 pole earth leakage circuit breakers, one with the all green lever and another with white levers for phases and green for neutral. Is there any special meaning to this? I've ...
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How to stop current leakage in LED matrix

I know that this issue has been discussed in this forum, but I am a beginner in electronics and I was unable to come up with a solution to my problem by reading the related threads. I am doing a 3x5 ...
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2answers
55 views

Signal leakage when volume is turned all the way down

I was hoping I could get help with a design I have breadboarded/diagrammed with regards to a low level signal still present when I have my volume pot turned all the way down. When I turn my volume ...
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1answer
176 views

Handling Hi voltage and very low current (10 mA) will need to prevent arc and corona effects on my PCB?

I' m following this guide; concretelly 3 and 4 chapters for High Voltage (HV) PCB design: https://www.magazines007.com/pdf/High-Voltage-PCDesign.pdf The fact is that I have read interesting ways to ...
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76 views

Is Icbo amplified in reality in Common Base configuration?

Regarding the active mode of operation: Icbo is leakage of the reverse biased C-B junction. It flows whether or not the emitter is floating, as long as there is a complete C-B circuit. The emitter ...
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How much mains leakage does an Ethernet connection to a PC induce, and what is the operating leakage path?

It seems that some users on another Stack have reported GFCI nuisance trips caused by mains leakage through twisted-pair Ethernet cables connected between computers on different branch circuits, or ...
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1answer
203 views

Reverse Current leak Battery+Diode in parallel

on my design, I am using two coin batteries in parallel and each battery has a Schottky diode in series to block the reverse current, in theory, it will avoid the higher potential battery "charge&...
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2answers
609 views

How are such low op-amp input currents possible?

I understand that op-amps have low input currents; that's one of their defining characteristics. But looking at the datasheet for the LMC6001 (amusingly called an "Ultra, Ultra-Low Input Current ...
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534 views

Earthing system on a mobile vehicle?

We have an electrical system which needs a low impedance earthing system below two ohms. We have provided a proper earthing system in our factory and it works well. Now my question is if the system is ...
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32 views

Temperature-dependent leakage current in IGBTs

On one hand, the leakage current of power electronics modules such as IGBTs depends on the temperature. On the other hand, the temperature distribution on the IGBT chips is significantly non-uniform ...
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1answer
212 views

Analog switch on an instrumentation amplifier input

I'm working on a project for school that involves a configurable input stage (AC/DC coupling and variable input impedance) connected to an instrumentation amplifier. I am wondering whether I will ...
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2answers
2k views

Ultra low leakage capacitor for nano amp current source

I am looking for capacitor type which has very low leakage such as 0.5nA since I am working with a sensor which generates between 0.9nA to 0.55uA. Based on my research Film or foil Capacitor has the ...
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1answer
739 views

Protecting a coin cell from high current spikes - using a capacitor or not?

I've built some prototypes and try to gather some data from them. Skip below the two horizontal lines to read more about it. Original Question Brief summary I would like to know whether it is ...
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2answers
646 views

Protecting against over voltage but with minimum leakage current

I have a circuit where I sense an input which is a voltage divider with resistor. Since the voltage divider needs to have high impedance, the current flowing through is in the range of 10's of uA. I ...
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4answers
3k views

How to measure leakage current?

I have an AC powered device, and a customer asks for exact leakage current. Current that can trigger a leakage current circuit breaker, so it's obviously something flowing through Y capacitors to the ...
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1answer
59 views

Electric Tester light up on secondary side of Ground

I have assembled a PCB, which takes mains input 240VAC line and Neutral (my system enclosed in plastic case , so no ground/earth is provided) , and it use on board SMPS module(https://www.meanwell.com/...
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2answers
1k views

How to wire latching SPDT relay using proximity switches without relay hanging

I have a hydraulic-driven piston pump that I designed and built. I need a way for the pump to automaticlly go up and down. I wired it using a SPDT relay and a 3 wire PNP NC (normally closed) and ...
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1k views

MOSFET switch is leaking current when off

I have an N-Channel MOSFET that I'm using as a switch, and after wiring 20 identical circuits, I'm finding that 3 of them seem to leaking current when switched to off. The MOSFET I'm using is from ...
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122 views

how can I get leakage current in tlp?

I got tlp test data and found that the current at vertical line means leakage current. But I don't understand the method how does the tlp-test measure the leakage current. I tried to search the ...
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1answer
791 views

Earth leakage tripping with 3 phase motor [closed]

I'm working in elevator world, i'm now in a strange situation. The 3 Phase synchronous motor is connected by drive then main controller and a distribution board. The faulty earth leakage circuit ...
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1answer
140 views

Floating Nwell schematic and introduction in a MOS switch

My classmate told me using a mos (body connect drain)as a switch may have leakage current,because there is a parasitic diode in that MOS,so there will have a leakage current.so i have to connect the ...
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3answers
6k views

difference between reverse saturation and leakage current

I searched a lot but I didn't find any answer For a PN junction diode is the leakage current when the diode is reverse biased Equal to the reverse saturation current?? If they are not equal so ...
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3answers
362 views

Maximum resistor values for transistor inverter (NOT gate)

I have my circuit configured this way because I'll be hooking up my 8051 microcontroller GPIO pin to the point where three resistors (R2, R3, and R4) intersect, and the microcontroller only outputs my ...
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436 views

Earth leakage from isolated power supply

I have recently put together a DIY bench power supply using a DPS5015 from Rui Deng and an old laptop power supply. Everything seems to be working fine except for a small amount of current leaking to ...
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1answer
710 views

Does leakage reactance of transformer depend on quantum of load?

In a single phase transformer, considering copper losses and core losses, I want to find whether the leakage reactance is affected by change in load on the secondary? I was unable to find an answer ...
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1answer
368 views

Li-Ion charger IC leakage current confusion

I'm currently building a Li-Ion battery charging circuit which has a 5V/2A input. It should implement load-sharing in order to keep the output alive during charging. For charging, I found the ...
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2answers
659 views

At what load is the leakage current quantified for a power supply?

In this document it says "According to IEC 60601-1, the leakage current limits are provided in Table 1." If the leakage current is due to Y capacitor, the load R and the the parasitic capacitance of ...
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1answer
1k views

I/O input leakage current definition

I'm collected some input leakage information for I/O libraries. Most vendors and datasheets give a maximum value +/-1uA for the input leakage information (see below an example): This value is higher ...