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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68 views

Is it possible to make this BJT-based voltage limiter more \$\beta\$-independent and temperature stable?

The following circuit limits the rail voltage to slightly above Vref, by drawing a lot of current, when the rail exceeds Vref. The BUF Block represents a supply such as LDO, Reference or other ...
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40 views

Bench PSU leaking voltage to case and not working properly

Tl;dr at bottom Recently I found old bench power supply in my closet and tried to test it but display kept on displaying 0.00v and 0.00a - the power supply is voltage and current regulated and has two ...
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17 views

Effect of regular PN junction diodes in series with Y caps on EMI circuit of 4 kW 400 V power supply?

I have to add diode in series with Y-cap on EMI to solve some other problem. I took this decision based on assumption EMI test will be for frequencies 150 kHz and more, for this frequency diode ...
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106 views

Can a diode reverse leakage current cause error in this circuit?

I want to measure C2 leakage current: simulate this circuit – Schematic created using CircuitLab C1 has a leakage current of its own, to prevent C1 leakage current cause error in the leakage ...
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28 views

Implications and cause for static discharge

For months, I've had a potential buildup culminating in static discharge when touching the chassis of my macbook pro at ONE location. No source could be identified (no ground leakage – I checked with ...
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66 views

Equivalent series resistance vs. parallel leakage conductance

I am studying a book called RF Circuit Design by Reinhold Ludwig and Gene Bogdanov (2nd Edition). In the first chapter on capacitors, they introduce the loss tangent and equivalent series resistance, ...
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150 views

Diode forward current with µV..mV forward bias

When running LTSpice simulations on forward biased diodes I get plots like the following: This example is for a BAS116 and a 1N4001 - the current in the sub mV region is about 5 orders of magnitude ...
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3answers
124 views

How can I calculate reverse leakage current in a Schottky diode in series with a resistor?

I am determining the reverse leakage of a Schottky diode in a circuit: simulate this circuit – Schematic created using CircuitLab The intention here is to bias the P-FET gate so that it ...
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61 views

Delayed RESET to MCU pin

Using the following schematic, I am charging a supercap (3.3F, 3V) via a solar panel and would like to keep a downstream microcontroller in reset mode until the supercap has charged a bit. To do so, I ...
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251 views

Zero Gate-Voltage Drain Current (IDss) vs Drain Source Voltage (Vds) relation for PMOS

The Drain to Source leakage current Idss at Zero Gate voltage (Vgs= 0) is normally 1uA(max). However the relationship (or Graph) with Vds (Drain-source voltage) is not mentioned in Datasheet. Que: ...
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51 views

Considering: battery + terminal hardwired thru relay coil thru BJT back to - terminal

I want to make a circuit which uses a latching relay to disconnect a battery from its circuit, but it will still have a path through the relay's coil and the BJT used to switch it. How significant to ...
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110 views

Leakage current through push-button and switch

I am developing a battery-powered application on a custom PCB, thus power consumption is critical. I am trying to minimize current consumption with stm32L4 MCU, by turning floating pins to analog, ...
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118 views

Very low leakage enhancement mode mosfets

I have a 1.8V logic signal that I would like to use to control an enhancement N-channel MOSFET to switch current through a resistor from the drain to a 3V power rail. It's in a very power sensitive ...
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1answer
269 views

Non-contact voltage tester beeping near anything metal in my house?

Ok this is my first post so apologies if this is inappropriate but I need some solid opinions from guys who know about house earthing So me and my dad just moved into an old house and I was walking ...
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47 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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50 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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572 views

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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63 views

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
525 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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42 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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38 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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79 views

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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1answer
76 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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1answer
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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38 views

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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130 views

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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168 views

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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169 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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48 views

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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1answer
392 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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3answers
103 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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2answers
781 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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1answer
47 views

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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237 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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144 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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4answers
187 views

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
61 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
223 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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1answer
149 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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1k views

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
280 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
656 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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993 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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40 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
307 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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3answers
4k 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
1k 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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1k 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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74 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/...