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Questions tagged [leakage-current]

Leakage is the current across a boundary normally viewed as insulating, such as the spontaneous discharge of a charged capacitor, or the flow of current across a transistor in the "off" state or a reverse-polarized diode. Leakage current can also refer to the unwanted current that flows from a circuit in equipment to the chassis, or to ground. If equipment is not properly grounded, this current flows through other paths, such as the human body.

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Fixing the voltage leak on a soldering station - What should be done? [closed]

I found a soldering station Aixun T3A on youtube that got a very positive review. The review said: High temperature accuracy Fast temperature heating speed Low temperature overshoot High power ...
euraad's user avatar
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How to track down <100µA earth leakage on DC rails

On our subsea robot, we have an isolated power supply (converting 3-phase AC into 320 Vdc). For security reasons, we have a line monitor monitoring the resistance between protective earth and both 0 V ...
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16 votes
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Why is my super-capacitor self-discharging so fast?

I'm experimenting with a night light powered by a mini solar panel charging a super-capacitor instead of battery. (I know, I know. It's not recommended for this usage but I want to try it anyway). It ...
eSeverus's user avatar
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3 votes
1 answer
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P-Ch MOSFET excessive gate leakage

I am building a simple battery undervoltage protection circuit. It should stop conducting once the input voltage drops below a certain point. This should be achieved by utilizing a PMOS and setting ...
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My HDMI cable is outputting constant current, is that normal?

I bought two cheap monitors in a local shop. They are basically the same model, and both came with an ungrounded external power supply. After getting a few shocks from the HDMI cable I realized it is ...
Ariel's user avatar
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3 answers
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Clarification about leakage current in IC

Datasheets usually specific pin leakage current for digital inputs in the Electrical Characteristics, which is generally in microamperes (µA) range. I understood from different SE posts that the ...
LoveEnigma's user avatar
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Lithium Ion Battery : Electrolytic Capacitor At Buck Converter Output

It is recommended not to parallel electrolytic capacitors with a battery due to the leakage current of the electrolytic capacitor (which is small but worthy of consideration over large time periods) ...
kando's user avatar
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Is this the leakage current of a MOSFET?

I'm trying to understand the leakage current characteristics of a 130nm PDK in Cadence. I set up a testbench by grounding the gate and source terminals of a nmos FET, and setting the drain voltage to ...
Jack Black's user avatar
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How to reduce sample and hold circuit drift

I've built a sample and hold circuit on LTSpice, and the output will drift up at a rate of ~100mV/s. Is there an obvious way to reduce this? Is this a function of the FET / opamp used? The obvious ...
Duncan Wither's user avatar
8 votes
5 answers
2k views

Diode in reverse lights up LED

I have small issue with my circuit that I can't wrap my head around. I have made a custom PCB powered both by USB and battery. I put a diode between them to block battery power from flowing into USB ...
Reicken Back's user avatar
4 votes
1 answer
226 views

Understanding Leakage Current specification in analog multiplexers

I want to build an analog front-end with a 16 channel multiplexer. On each multiplexer input, there will be a voltage divider made from resistors. On the multiplexer output, there will be an op amp ...
Mau5's user avatar
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Precautions when using multiple analog devices on same circuit

I have a KP236N6165XTMA1 5V analog pressure sensor and a SHT31-ARP-B 3.3V analog temperature and humidity sensor on the same circuit, connected to the same ground plane (see v0.2 schematic bellow). ...
Tommy95's user avatar
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Why does subthreshold leakage increase with increasing temperature?

As far as I know, the source-drain subthreshold leakage current in a MOSFET is given by $$I_{ds} = e^{1.8} \frac{\mu C_{ox} W}{L} \left( \frac{kT}{q} \right)^2 e^{\frac{V_{gs} - V_t}{n \frac{kT}{q}}} \...
EE18's user avatar
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Reducing Isolation Transformer Leakage

I watched this video and wonder if its complete separation of primary and secondary coils is the normal way to wind a low-power isolation transformer (e.g., 60Hz 120V 120VA). I particularly want low ...
bobuhito's user avatar
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High voltage at the Schottky's anode terminal (Hobby Li-Po charger circuit)

I'm pretty new at hardware side of things and trying to teach myself circuit and PCB design just as a hobby, so. bear with me if I'm annoyingly noob for you. As a relatively simple first task, I ...
reo's user avatar
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Residual current relay continuity

Even if the leakage current relay is 300 mA, it cannot provide human protection in such a case. Then, if I make a circuit like this, if there is already 270 mA leakage, then if there is an extra 30 mA ...
Jundullah's user avatar
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Selecting Balancing Resistors for HV Capacitor Bank

I am constructing a High Voltage (150 kV DC) capacitor bank. I have elected to connect 10 capacitors in series, with 10 such branches connected in parallel. My next mission is to create balancing ...
Wyll Astarion's user avatar
1 vote
2 answers
144 views

AC leakage issue with high impedance measurement setup

I am having an AC leakage current problem with my measurement setup that I typically use for lock-in measurements. I employ a 100 M\$\Omega\$ resistor as a voltage-current converter, and in series, a ...
183iuU's user avatar
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2 answers
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Does ESD protection cause voltage leakage?

I have a this schematic for powering ESP32 over the usb and communicate PC with usb interface. It works perfect. But there is a interesting error. while I am powering ESP32 with Lipo battery (In case ...
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CRS01(TE85L,Q,M) Schottky diode is open both ways

I was testing my PCB when I noticed that I get +12 V on USB Vbus line, even though I placed a Schottky diode to block it. The idea is to use +12 V voltage source to provide power and to connect USB ...
Dominykas's user avatar
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1 answer
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Mean Well Power supplies have much lower efficiency and much higher leakage current than rated

I am going to have a power supply which will always be connected to AC mains and occasionally, a led strip will be connected and disconnected to the supply with a relay. I want an efficient and low &...
CaveScientist's user avatar
2 votes
4 answers
1k views

How to detect leak or shortcircuit in electrical wires undeground?

Recently, the circuit breaker was triggered when I activated the electricity in a cable buried in my garden. Probably water entered into a junction or I nicked the line by accident... The line is not ...
IceCold's user avatar
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Monitoring ground mA current via voltage transformer [closed]

The TL;DR Can a voltage transformer act as a milliamp current sensor? They resemble in structure. Explanation I want to build an approximate ground leak milli-ammeter (0.1-30 mA) for some appliance. ...
Meymann's user avatar
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Diagnosing RCBO trip when heating elements turn off

First up let me know if this should be over on home improvement or similar, I selected here as I thought it would be a better place to ask more technical questions. Recently our sub-board was replaced ...
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3 votes
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Why does my RCCB keeps tripping every time I want to start a 3-phase motor?

I am working on a filtration pump using a simple start-stop button for the 3 phase motor Electrical diagram is attached below. Most of the main components are from Schneider. The "Pump Run" ...
Kelvin Galiny's user avatar
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2 answers
57 views

Can I measure pinholes in a dielectric layer using LCR meter?

I have a thin dielectric film (~1 um) and I want to measure the quality of the film in terms of not allowing leakage current through pinholes. Can I use an LCR meter for this purpose? If yes, how? If ...
SNIreaPER's user avatar
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0 answers
63 views

How do you calculate the leakage current for the I2C interface in the active and sleep states?

How do you calculate the leakage current and power loss for the I2C interface in the active and sleep states? Consider that the I2C operates at the maximum data rate of 1 MHz (Fast mode plus), with a ...
Ananthesh's user avatar
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1 answer
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Is this RC Snubber functional?

I had made this circuit which is basically works somehow as a UPS (when there is a power failure from the mains (220 VAC) the inverter line turns on and keeps the load on) and yes I had tested the ...
Hazardous Voltage's user avatar
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1 answer
111 views

Inrush problem while using a isolated DC lab power supply

I'm puzzled by an issue I've been observing during my testing of H-bridge buck converter. I'm using 2 lab bench DC PSU such as E3630 (Keysigh)t to supply ISOLATED 5V to a driver. When I power up the ...
penguineering's user avatar
3 votes
3 answers
283 views

Cost-Effective yet reliable earth detection circuit with <100µA current draw

I'm working on a cost-effective circuit to detect the presence of an earth ground connection in a 230V AC mains line (at 50Hz). One of the key design constraints is to keep the current draw less than ...
15 Volts's user avatar
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2 votes
3 answers
550 views

Formula for calculating capacitor balance resistor values

The following formula is generally used for calculating balance resistor values used for overvoltage protection of capacitors in series when the individual capacitor voltage ratings are below the ...
Duke William's user avatar
5 votes
2 answers
768 views

Voltage drop due to leakage current in capacitors in series

When capacitors are connected in series in a DC circuit, the voltage drop across individual capacitors at and immediately after the initial charging period is inversely proportional to the individual ...
Duke William's user avatar
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0 answers
171 views

How much leakage current is too much in a transformer?

I have a 3-phase transformer with 3 primary windings and 3 pairs of secondary windings. I'm trying to test the isolation between the secondary winding pairs. To do this I shorted A1, B1, C1 and A2, B2,...
Thomas C.'s user avatar
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1 answer
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how to measure leakage current across a zener diode with a transimpedance op amp

I am trying to measure the leakage current of a SMF36CA zener diode. I am doing this with a transimpedance op amp (LMC6062IM/NOPB). Attached is the circuit I am using. The amp and diode in the circuit ...
Temujin's user avatar
-1 votes
1 answer
70 views

Leakage current in supercapacitors stack

Given a circuit of four hybrid supercapacitors in series, connected in parallel with another branch of supercaps in series (4s, 2p), where the leakage current is illustrated as a parallel resistance ...
Nic1337's user avatar
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1 answer
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Hipot results vs surface area

I trying to hipot test a 12"x12" metal with kapton layer. Different sizes of metal (e.g. 1"x1", 4"x4", banana plug) is placed on top of kapton tape. The bigger metal ...
Ybx Nop's user avatar
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1 answer
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Is this a possible Leakage current problem

I have a question about the connection circuit between µ-controller and KSZ8851SNL. Are the CSN and SO pins of the KSZ8851SNL tolerant inputs? When Q1 is off, LAN3.3V was 0.9V in actual measurement. ...
user avatar
3 votes
2 answers
207 views

What is the reason for exponential decay of ceramic capacitor leakage current?

I came across two Tektronix documents describing how to measure leakage current. Both of them say that current decays exponentially, which I don't understand. I expect a constant leakage current ...
Ken Grimes's user avatar
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1 vote
1 answer
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How to find low DC leakage capacitors?

In some refdesign I'm following (for PoE), they ask to a 1nF capacitor to earth/chassis (not GND). One of the global design constraints is to maintain DC-resistance of at least 20M between all ...
Sandro's user avatar
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2 votes
1 answer
642 views

Why is my 3-phase power giving me two 180 V phases and a 40 V phase?

I have 3-phase power hooked up to my building. I also have solar panels feeding the grid. Most of the power in the building is functioning normally. I tested the phases with a multimeter and got 120 - ...
IssacharWEB's user avatar
2 votes
1 answer
140 views

Residue voltage due to gate driver leakage current

I want to reduce the leakage current of a gate driver driving an IGBT as I have some residual voltage on the high voltage line LV for communication is on. The residual voltage on the high voltage line ...
Alison's user avatar
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3 votes
0 answers
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Can I make active devices share voltage equally using ad hoc shunt resistors?

I have 3 active devices in series, SCRs in this case but I'm guessing that's not important. Each is rated for 2.4 kV. The total voltage I will actually apply is 6.6 kV. Leakage current is guaranteed ...
James Strieter's user avatar
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1 answer
155 views

Analog switch unpowered state

The board I am designing is a test board for another battery powered PCBA. I am using a MAX4737EUD+ and a TMUX1101DBVR in my project to switch signals and power to the PCBA under test. They are also ...
Mark87's user avatar
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1 answer
342 views

Handling large current peaks on CR2032 battery

I’m designing a nRF52832 SOC based device and I came across this issue with energy buffering and battery voltage drop. I am using a CR2032 battery, nRF52832 SoC and a VCNL3040 proximity sensor. This ...
Letho's user avatar
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0 answers
227 views

Is there a formula for the current leakage of a Zener diode?

I have this setup: The problem with this setup is that when there is a 3.2 V voltage drop acriss the 160 Ω (vertical) resistor, then there's NOT a 3.2 V voltage drop across the Zener diode, in ...
euraad's user avatar
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0 votes
4 answers
212 views

Can I use a plastic water tube as resistance to protect bathing people within a safe voltage?

Suppose home water has a resistivity of 2 Ωm, home electricity is AC 220 V, and human body in shower has a resistance of 1 kΩ. Then a resistance R = 8.2 kΩ, which is a plastic water pipe of 1.29 m in ...
PineapplePie's user avatar
4 votes
2 answers
904 views

How do medical SMPS achieve lower Earth leakage compared to "regular" AC-DC SMPS?

When using a "regular" (i.e. not medical grade) AC-DC isolated SMPS in the following fashion, a strong mains common-mode voltage is created on the DC side due to - I believe - the stray ...
tobalt's user avatar
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2 votes
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Connection between chassis GND to circuit GND

I have two requirements to use a chassis Reduce circuit board leakage Dissipate heat In my application I'm using the connection as shown below. Here I have fixed the chassis over the SMPS through ...
Sourav Garnaik's user avatar
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2 answers
275 views

Does the gate leakage current increase or decrease the drain current in MOSFET?

I know that the gate leakage means that the electrons are injected from the gate metal into the channel, therefore the conventional current direction is from channel to the gate. From KCL, I think ...
user207787's user avatar
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1 answer
282 views

Controlling SMPS with SSR (Blinking SMPS)

I want to control AC for Meanwell RS-25-3.3 using SSR-25DA. When SSR is off mode the SMPS keep blinking as in hiccup mode, I think. I don’t think leakage current from SSR is too high to trigger this ...
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