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)

Filter by
Sorted by
Tagged with
0 votes
0 answers
22 views

DC leakage in single and three-phase rectifier (Electric vehicle chargers)

It seems that the IEC 61851-1 standard ask for a device monitoring DC earth current for any EV charging station, either single or three phases. What I'm wondering, is, which topology of charger, or ...
user avatar
  • 21
0 votes
1 answer
32 views

Trying to understand Output Leakage vs Input Current

I have a device (VSC8540) driving another device (LS1046). The driver specifies output leakage current as +/- 85uA. The receiver specifies input current as +/-50uA. First of all, is the input current ...
user avatar
  • 111
0 votes
1 answer
27 views

Differential current sensor probe- Ground leakage current measurement probe for oscilloscope

I would like to know what you use to measure differential current which is also leakage current sensing. Background: In industry , the AC or DC current flowing from inverter/ converter needs to have ...
user avatar
0 votes
0 answers
29 views

TIDA-01513 Riso calculation

Can someone assist with getting the Riso value using the datasheet HV_batt = 400V ISO_NEG = 4.278V Rns1+Rns2 = 1.2Mohm Vref = 2.5V Rs2 = 5kohm Using the equation TI used, we get Riso = -68110.24 ohms, ...
user avatar
  • 1,261
0 votes
0 answers
40 views

Isolation detection circuit design

I came across the TIDA-01513 ref design by TI. The site is found over here. I have made a simulation of this design but I am not getting the desired results stated in the ref design. According to the ...
user avatar
  • 1,261
1 vote
2 answers
66 views

Why is my capacitors' leakage current much higher than it should be?

I have a capacitor bank consisting of five 3.3 mF electrolytic capacitors. (Itelcond 400 V 3300µF datasheet here.) The five capacitors are connected in parallel and there's a charging circuit with a ...
user avatar
  • 307
6 votes
3 answers
462 views

Opamp Guard Polygon: Only in Top PCB layer or or all layers

I have an opamp circuit as shown below. My board stack up is SIGNAL-GND-POWER-SIGNAL. I am providing a polygon to Guard the trace which is going to non-inverting the input of the opamp. The guard ...
user avatar
  • 572
0 votes
1 answer
65 views

Battery drain on a simple UPS circuit

I've got a question about this very simple 2 diode UPS circuit, using a non-rechargeable battery. Basically, the battery takes over the circuit when the external mains power supply is removed (...
user avatar
1 vote
0 answers
34 views

Insulation testing of chassis leakage current/voltage (Megohmmeter)

Previous post I feel my original post was not asked in a correct manner. I previously said I wanted to detect voltage but it now appears I should be detecting current instead. My setup still remains ...
user avatar
  • 1,261
1 vote
0 answers
58 views

How to fix LED fixture not turning off completely when the switch is off

I have LED ceiling lights that are not completely turning off even when the switch is off. Sometimes the brightness of the glow is just to much for me and finally decided to do something about it. ...
user avatar
  • 557
0 votes
3 answers
105 views

Detecting enclosure voltage for batteries

I have made an enclosure out of metal that is used to enclose my battery pack. I have stacked this enclosure with 18650 lithium batteries to build up a battery pack (24V). Every time an error is ...
user avatar
  • 1,261
2 votes
0 answers
53 views

When talking of mains leakage current, presumably this is an AC phenomenon. Can it cancel and/or is it filterable?

I have recently learned that switching power supplies tend to push up to the limit of 3.5 mA leakage to the ground wire on the mains supply. Presumably this is entirely AC, 3.5 mA RMS, and there is no ...
user avatar
  • 485
0 votes
3 answers
95 views

UK: is up to 2 V AC between ground and neutral to be expected in a house supply?

I am seeing around 2 V AC between ground and the neutral, circa 240 V AC to the live wire. Is this normal or does this indicate a weak ground or some leakage path between lines perhaps? I have an ...
user avatar
  • 485
-1 votes
1 answer
111 views

What will happen if I use RCBO where there is no neutral in the system?

I need some help. Could you please go through the scenario and try to answer my query below? This system is installed in a ship where there is no neutral connection available. A 440V/220V step-down ...
user avatar
  • 1
3 votes
1 answer
129 views

Decoupling Capacitor on GPIO instead of connected directly to battery

I am building a device that is for most of the time in sleep mode. When woken up, I am sending some BLE signals and use a LED. To support the battery I have a 2u2F capacitor. But because my battery is ...
user avatar
  • 307
1 vote
0 answers
60 views

How to test if a domestic 3 phase power company meter is reading wrong?

BACKGROUND: Domestic 3 phase 220VAC supply in Thailand. Power company meter is 4 wire GE 3 phase 15A/45A. Massive power bills when mains breakers were turned off (back in home country for 9 months ...
user avatar
1 vote
0 answers
62 views

Will using this mains EMI filter exceed maximum earth leakage when used together with an AC/DC converter

For an industrial piece of equipment with AC power inlet, I want to use this internal AC/DC converter with a given maximum earth leakage current of 2 mA at 250VAC. Now it was suggested to also use a ...
user avatar
  • 10.2k
0 votes
2 answers
121 views

Isolated voltage measurement with an ACS37800

I am measuring 250VAC with an ACS37800. It happens to be a PWM based output of a TRIAC. For testing purposes, I am varying the duty cycle and input voltage to validate the measurement circuitry. My ...
user avatar
1 vote
1 answer
180 views

What is the relation between reverse saturation current and leakage current in a BJT?

I have been studying Studying Donald Neamen's Electronic Circuits 4th edition and Sedra Smith's Microelectronics 7th edition for quite some time now. I have been self studying. After searching ...
user avatar
2 votes
1 answer
68 views

Why is my measured leakage current of the capacitors much lower than my calculated value?

This is more a theoretical question. I have a DC circuit with multiple capacitors with different voltages. Because I need to know how much current my circuit needs over a longer time, I calculated all ...
user avatar
  • 307
0 votes
1 answer
239 views

Calculating capacitor leakage current

I'm trying to calculate the approximate leakage current for some capacitors I have. They are 5F 2.7v supercapacitors. I charged them up to 2.69v using a precision bench supply through a 68 ohm ...
user avatar
  • 101
0 votes
2 answers
49 views

Alternatives for a physical relay to disconnect pins of an MCU board from testing jig?

There is a certain system (PCB) which is built around an ARM microcontroller. In order to test the system, I used a DAQ by National Instruments which is able to simulate various conditions (both ...
user avatar
1 vote
2 answers
87 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 ...
user avatar
  • 10.2k
0 votes
0 answers
49 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 ...
user avatar
0 votes
1 answer
21 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 ...
user avatar
2 votes
1 answer
131 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 ...
user avatar
  • 1,974
0 votes
0 answers
29 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 ...
user avatar
  • 1
2 votes
1 answer
81 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, ...
user avatar
  • 135
6 votes
1 answer
186 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 ...
user avatar
  • 10.2k
0 votes
3 answers
283 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 ...
user avatar
  • 27k
0 votes
1 answer
73 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 ...
user avatar
1 vote
0 answers
615 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: ...
user avatar
0 votes
1 answer
54 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 ...
user avatar
  • 35
0 votes
1 answer
202 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, ...
user avatar
  • 46
0 votes
1 answer
249 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 ...
user avatar
  • 1
2 votes
1 answer
411 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 ...
user avatar
0 votes
0 answers
63 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 ...
user avatar
0 votes
1 answer
57 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") ...
user avatar
0 votes
3 answers
863 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 ...
user avatar
2 votes
0 answers
71 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(...
user avatar
1 vote
2 answers
961 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 ...
user avatar
0 votes
0 answers
46 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 ...
user avatar
0 votes
0 answers
42 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 ...
user avatar
0 votes
0 answers
114 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 ...
user avatar
0 votes
1 answer
119 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 (...
user avatar
1 vote
1 answer
31 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 ...
user avatar
  • 161
0 votes
0 answers
43 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 ...
user avatar
  • 1
1 vote
0 answers
209 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,...
user avatar
1 vote
0 answers
301 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 ...
user avatar
  • 122
1 vote
2 answers
309 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 ...
user avatar