Questions tagged [electronic-load]

An electronic load (sometimes called an "e-load") is a device which simulates an electrical load, often as a way to test a circuit's behavior under various load conditions. Many e-loads can be programmed to act as a constant resistance, constant current, constant voltage, or constant power load.

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Will a 0.37kW 0.5HP 1PH 180-240V 2.8A water pump work with a TP-Link P110 16A smart plug? [closed]

The water pump has mentioned these thing on it's label: 0.37kW 0.5HP 1PH 180-240v 2.8A And the manual of TP-Link says only 1/6 HP Motor is supported. Specifications: Voltage: 220-230V~ 50/60Hz Max ...
ankit.karan99's user avatar
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OCP protection circuit

simulate this circuit – Schematic created using CircuitLab I wanted a project to learn stuff and test my own skills, so I started to design a DC electronic load. For this project I imposed ...
Pierpaolo Sicignano's user avatar
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1 answer
52 views

OpAmp Input Impedance vs Load resistance

I have below photodiode that provide low rise time based on 50 ohm load resistor. However I'm planning to use it with opamp in transimpedance configuration. In this configuration, current is running ...
LifeIsBeatiful's user avatar
1 vote
1 answer
51 views

0V with Electronic Load and CC Buck

Why would an electronic load show 0 V and a big current when connected to a constant current source? The load is in constant current mode. Is that the culprit? Probably a constant impedance would be ...
TobiasPSP's user avatar
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1 answer
72 views

How can I verify the operating specification of a PCB? [closed]

I have a couple of PCBs which work with each other: core PCB, middleware PCB and a peripheral PCB. All of them have a voltage and current rating along with protection circuits. What tests can I ...
Varun Dhaka's user avatar
1 vote
2 answers
93 views

Am I connecting these MOSFETs in parallel correctly?

I am designing an electronic load for a battery, and I don't want to use a single MOSFET that carries the entire current and has to be bolted to a large heat sink. So, I thought about connecting 3 ...
WalterPH's user avatar
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2 answers
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Understanding accuracy specification for an electronic load box

I am using a BK Precision 8600 electronic load box. I am using it in constant resistance mode (CR mode). I have two resistances I am using, 15Ω and 5Ω, and I am interested in determining the max/min ...
Mikero's user avatar
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How can I electronically measure the load of an AC transformer?

I'm wondering how to electronically measure the load of an AC transformer at the output of the secondary winding. I don't want to calculate the core size but use a measurement instrument - which one? ...
Jerzy Przezdziecki's user avatar
2 votes
3 answers
99 views

How can I analyse this circuit to get a function for Vs in terms of Vin?

I´m trying to build an electronic DC load using a circuit similar to this one. I saw this circuit in an application note saying that it uses the opamp as a differential amplifier. I´m trying to get Vs ...
agustin jose's user avatar
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Build PWM controlled load for solar panel

for my project, I need to build a variable load to measure the I-V characteristic of solar panel that I can control with a PWM signal from ESP32 (3v3). I'm a software developer, so I do not completely ...
Ondrej Krejci's user avatar
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Measuring voltage but no power with DMM

Hello guys i am a novice electronic engineer and i run up to a question on some troubleshooting i was doing. I have an old audio door phone system that has 2 designed outputs for the 12VAC electric ...
j_pentester's user avatar
4 votes
2 answers
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Electrical characteristics on datasheet

What does this part of a datasheet mean? I always get confused when studying them... Is the user suppose to meet these conditions before getting the results stated on the sheet?
imran muhd's user avatar
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1 answer
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How do you choose the right load for reliability testing?

I am an automotive reliability and test engineer. I do environmental or electrical tests and during these tests I need to load my products. By load I mean, for example, there is a mosfet driven by a ...
Taha Füzün's user avatar
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0 answers
29 views

IP5301 USB Negotiating?

Currently trying to get this board to simply supply me 5v through the USB terminals on the back. https://a.co/d/3mZtA3k I have the USB + and - hooked to a Wemos D1 Mini V4, and when I activate the KEY ...
Yotta's user avatar
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4 answers
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Why do we need a bench electronic load equipment and can't just rely on a potentiometer instead?

The bench electronic load is a type of equipment defined as "An electronic load designed to sink current and absorb power out of a power source. If a power supply is used to power a device, an ...
quantum231's user avatar
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1 vote
2 answers
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Using a MOSFET as a low current DC load

I am trying to design a circuit which can simulate very low DC loads (up to 1A). For this, I was wondering if I could use an IRF3205 (since I have a couple lying around) and keep my Vgs very close to ...
ACBlue's user avatar
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Input impedance of an electronic load

I would like to simulate a TVS with an electronic load working in constant voltage. I could add some resistor in serie with the electronic load to simulate the dynamic resistor of the TVS. ...
Jess's user avatar
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Ensure that cable is not disconnected from my custom board

I designed a custom board, the board includes stm32 that turns on a control voltage that operates SSR and the SSR goes to the load: CTR comes from the GPIO of STM32. in my custom board, there is some ...
Knowledge's user avatar
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6 votes
1 answer
941 views

What is the maximum current of an electronic load?

Here is the specification of an electronic load: If the load is set in current mode, the current is limited to 25 A. Nevertheless, if the current is set in resistor mode, I could think that it is ...
Jess's user avatar
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1 answer
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Instantaneous change in DC electronic load power

I am attempting to observe current transient behavior for a DC-DC converter when the loading changes instantaneously. For example, I want to observe current transients at the output of the converter ...
flamezdude's user avatar
1 vote
0 answers
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Fuel cell potential cycling: How can I increase the rise time?

First of all, my background on electronics is quite limited. I conduct potential cycling experiments on fuel cells. I think, in your terms it would be, I drive capacitive loads with a step voltage ...
sadgephd's user avatar
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Constant Current/Constant Voltage Cycling of Li-Ion Battery w/ Arduino

I would like to build a basic cycling controller for charging and discharging small Li-ion coin cells, and plot the voltage curve. As recommended for LiFePO4, there is a Constant Current Charge and ...
CuriousPaul's user avatar
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2 answers
1k views

Substantial voltage drop when connecting battery to DC load

I wanted to test the battery from an e-bike. I have noticed quite strange behavior. The first thing I did was to measure the voltage. It was 66.1V which is fine for a 60V battery. When I connect the ...
seeker's user avatar
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1 answer
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Trouble using PNP as a switch

I simulated a circuit as shown below and it works as expected when the switch is closed or opened. I later change the 2n2907 to FMMT591A due to availability, continuous collector current and size. I ...
HGO's user avatar
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1 answer
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How can I make a 50mH inductor/coil that can stand up to 3A current to be used as a DC inductive load?

It will be used to simulate an inductive load for a DC output.
Shamooooot's user avatar
4 votes
0 answers
194 views

Fixing overshoot in current regulation of AC electronic load

My AC electronic load (previous question here) shall have a constant-current mode. It is being simulated in LTspice. @devnull helped design the circuit for AC loads, but for simplicity's sake in the ...
1N4001's user avatar
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1 vote
2 answers
539 views

Electronic load for AC - regulating current in both directions

I'm trying to design an electronic load that will take DC or AC (up to 20kHz, for audio amplifier or bench power supply testing) and show a constant (but adjustable) resistance. I'll be using N-FETs ...
1N4001's user avatar
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-2 votes
1 answer
806 views

Why is the capacitor filter in parallel with the load and the choke in series in a choke input filter?

What will happen if we interchange them? In a capacitor filter, the capacitor discharges through the load, it was connected in parallel to load. From what I have concluded, if the capacitor is in ...
user305532's user avatar
0 votes
2 answers
1k views

How is the peak inverse voltage of diodes in a center tapped rectifier twice than the bridge?

I am not able to understand how the PIV becomes twice in case of centre-tapped rectifier. PIV is the maximum inverse voltage that a diode can handle before having a breakdown. For a half wave ...
user305532's user avatar
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301 views

Two stage operation amplifier using MOSFET: How to increase the cut off frequency

so I'm trying to design a two stage MOSFET op amp and I'm required to get a gain bandwidth of more than 260Ghz. I'm biasing the first stage with Vb1 around 2.1 V, 1.9 for 2 and 2V for Vb3. With Vdd =3....
Rakan Alamri's user avatar
-1 votes
1 answer
140 views

Heatsink size calculation

Let's say I found a random heatsink with no name or model or anything else from which I can find a datasheet and get its thermal resistance. Therefore, simply by knowing its sizes, how can I calculate ...
Mohsen Razzaghi's user avatar
2 votes
1 answer
472 views

Do you think this circuit will work?

I searched the internet and made h-bridge circuit: By combining resistor R5 and R7 are connected to, when I give the pin HIGH, it will rotate counterclockwise when I give it LOW in the clockwise ...
bahadır güven's user avatar
0 votes
2 answers
123 views

Why are the electrons coming back with 1V?

The current is in conventional flow , it enters the battery. Is it possible that the electrons that go out of the current source come back to it with 1000mV?
Aamirshah SHAIK's user avatar
5 votes
2 answers
1k views

MOSFETs in parallel, combining heat-sharing and ballast resistors?

In a circuit like this: simulate this circuit – Schematic created using CircuitLab If each 3 MOSFETs be next to each other and on one heatsink, is current sharing balanced? If MOSFETs have TO-...
ElectronSurf's user avatar
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2 votes
2 answers
399 views

Problems with over/undershoot in voltage-controlled MOSFET current sink

I'm in the process of designing an electronic load for testing batteries. The goal is to control the load current in the range of 0 - 10 A with a 0 - 1.2 V signal from a DAC. For easy calculations and ...
MMaz's user avatar
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0 votes
0 answers
167 views

Potential DC protocol / load detection preventing battery pack from working?

I have a slew of Makita 18v Tool batteries and was considering other ways in which they might be repurposed. I know the Makita range of BL18XXB batteries from teardowns on the internet uses internal ...
John S.'s user avatar
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2 votes
1 answer
1k views

What test equipment can simulate the inductive load of a DC motor?

I am working on a power supply circuit designed to drive DC motor. Currently, I am testing using the actual DC motor, but I would like to start using test equipment instead. There are several options ...
user8908459's user avatar
0 votes
2 answers
199 views

Buck regulator transient response explanation

I am using TPS5450 buck regulator and trying to measure the transient response but seem to see a weird triangular adjustment before it settles. I can't see anything in the datasheet that would explain ...
Hasman404's user avatar
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0 votes
1 answer
2k views

How to find transfer function of this filter?

How can I find the transfer function of this circuit? Is there any way to find the total impedance? I don't want to use Laplace transform. And can I find the bode diagram for this circuit?
Avyaan sall's user avatar
1 vote
2 answers
91 views

In-Series current source equation solving

I'm an electronic newbie, i was simulating this circuit on LtSpice and i found the result below, i tried with different methods (Kirchhoff's laws, Millman theorem, superposition) but i failed to have ...
menala.96's user avatar
-4 votes
1 answer
95 views

Why will this circuit not work? I need a perfect reason [closed]

Will this bulb light for nanoseconds?
Raj Tripathi's user avatar
0 votes
2 answers
226 views

Multiplexing 24V signals to DC load generator

(Electronics beginner) I have a DC load generator (TENMA 72-13210 a rebrand of Korad KEL103). I want to use if for testing a custom board designed in-house with 30 outputs each capable of driving 10A ...
Daniel Näslund's user avatar
2 votes
5 answers
5k views

What is the difference between high-Z (high impedance ) and open circuit?

I cannot understand exactly difference between them. I am not sure about this topic. I think high-Z means "temporarily open circuit." Can you explain the difference to me?
maltnts's user avatar
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2 votes
1 answer
754 views

Need guidance for building a electronic load using BJTs

I've been studying DC electronic loads and almost all of them used mosfet as main transistor, while researching I find out that mosfets that are designed to work in their linear region are expensive ...
ElectronSurf's user avatar
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1 vote
2 answers
1k views

Constant resistance mode in electronic load

I have this DC electronic load. I am setting this electronic load to a constant resistance mode option - say 100 ohms - and turning the output ON. When I measure the resistance across the electronic ...
user avatar
0 votes
1 answer
262 views

Problems enabling remote voltage-sense Rigol load DL3021 via SCPI

I am automating some tests with Rigol hardware. There is only one bottleneck in the SCPI implementation that I can't figure out: How to enable the remote voltage-sense terminals on the Rigol DP3021 ...
Michael's user avatar
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1 vote
1 answer
41 views

Confusion on Voltage levels in Digital Waveforms

My question is why Io is in different direction when Vo=H and Vo=L respectively? I really can not understand the underlying mechanism!
PRITAM the cat of Newton's user avatar
0 votes
1 answer
186 views

Using Inductor and Electronic Load Instead of a Permanent Magnet Synchronous Motor (PMSM)

I would like to test whether my power board can handle to currents required to drive a 1.5 kW motor. My issue is that the motor testbench is still not here and I have to test it now. I do not have ...
Ivan Vlaykov's user avatar
0 votes
2 answers
3k views

How to use SCPI over RS232 with a Rigol Programmable load?

I have a Rigol DL3021 programmable load. I'd like to control it as part of an automated test setup, over SCPI from a Linux box. Their programming manual assumes you're on a Windows machine and wants ...
brenzo's user avatar
  • 433
3 votes
1 answer
272 views

Battery/Charger Not Reaching Float with Load Attached

I'm trying to add a backup/UPS to a system I have outside with the following battery charger - https://www.meanwell.com/Upload/PDF/ENC-180/ENC-180-SPEC.PDF . The DIP switches are set for AGM mode. My ...
fullyjosh's user avatar