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Questions tagged [switching]

Switching can be defined as the change in state whether it be an analog, digital, or mechanical device. For digital devices, switching can be defined as a transition from HIGH to LOW or vice versa. For analog devices, switching can be defined as a change of operation within a transistor. Mechanical device examples include physical light switches or button switches. Ultimately, switching interrupts current from going into another conductor path.

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Transistor switching speed

I want to be able to identify the speed of a transistor in terms of switching. Most datasheets don't indicate that but I found this transistor from ST-Electronics. Is it the maximum switching ...
A'amir Zain's user avatar
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55 views

MOSFET switching efficiency in SPWM DC to AC inverter

After a look in deep in the switching curves of the gates, and I am wondering if switching is acceptable for work MOSFET in SPWM H bridge LF inverter. I would like your general opinion on all points ...
oropeiro's user avatar
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Do I need an input capacitor for a switching voltage regulator, if I already have electrolytic capacitors?

Assume that you're converting 24VAC to 24VDC (which becomes about 32 in reality). Then you want to covert the 24VDC to 7.5V by using a switching voltage regulator. You're already using 220 uF caps in ...
euraad's user avatar
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Designing a 24 V output relay using PCF8575

For this project I am using a NUCLEO-F429ZI which interfacing with PCF8575 over I2C. I am operating the PCF8575 only as output. I have tested the PCF with NUCLEO and it works without any issues. But, ...
naman's user avatar
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2 votes
1 answer
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Recommended way of power switching external modules & peripherals

I recently designed a PCB that is battery powered. Ideally I want this to be a low powered device, and as such have endeavoured to implement controls and systems to decrease power consumption. My MCU ...
Explorex's user avatar
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3 answers
93 views

Help Needed with Compact Circuit Design for Pulse-Triggered Switch-Off Sequence

I am currently working on a small electronics project for my swimming club and could use some advice. Forgive me if this is basic, I'm really new to electronics. The project requires a compact circuit ...
Sean O'Sullivan's user avatar
1 vote
1 answer
61 views

High side MOSFET driver - transistor design

A simple dc-ac converter in full bridge structure and the structure I created to drive the MOSFETs are given in the diagram below.The output of the converter is working properly. The circuit consists ...
Mhan's user avatar
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1 answer
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How to control lightweight pull-up and pull-downs from GPIO-style pins?

I'm a novice at fine electrical theory. My daughter and I have a few micro:bit cards, and we're starting to branch out from basic servo robotics. One such project is controlling her train layout. We ...
Oli's user avatar
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1 answer
42 views

H-bridge motor braking via NC button

New guy here. I'm doing some work for an engineering professor; he wants me to implement stop/braking capability on the robot we are working on. The platform used is a Pioneer 3-DX, with two motors ...
Flubberknuckle's user avatar
1 vote
0 answers
181 views

P-MOSFET not turning OFF

I am using an IRF9640N P-channel MOSFET to switch a 100 Ω load. Gate is controlled via 2N5551 NPN transistor using a series of resistances. The circuit works perfectly fine up to 40 V of supply ...
Goeld's user avatar
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3 answers
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Car button - Switch current impulse to relay

I will add momentary push button to car infotainment panel (instead of blank). It's VW/Audi original button which I want to use to switch relay (ys-rt1c - Timer delay turn off) to supply 12 V for rear ...
Jason's user avatar
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1 vote
2 answers
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Can a 4066 IC work at 3.3V?

I am trying to incorporate a CD4066 in my circuit to switch a 3.3V signal. I am bad at reading datasheets but I think this datasheet says this IC works with 5V-15V between VDD and GND pins of the IC. ...
Iskander's user avatar
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3 answers
103 views

Simple transistor switch does not work

I have a simple switch system based on an NPN transistor (it is supposed to be part of a larger project) which unfortunately does not work and I don't know why. Could someone take a look at what's ...
user3788160's user avatar
1 vote
1 answer
86 views

MOSFET Total Gate charge graph (Qg)

Below is a Vgs -Qg graph of the IXTH88N30P N-channel MOSFET. Datasheet: https://www.mouser.com.tr/datasheet/2/240/media-3322045.pdf As seen in the graph, this curve is given for Vds = 150 V, Id = 44 A ...
Mhan's user avatar
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How to improve mosfet switching timing?

I am a hobbyist and I am not a native so bear with me please. I was looking for a fast mosfet and by looking at some datasheets I noticed that switching time is not a constant parameter like this one: ...
Tintin's user avatar
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ESP32: Detect switch or button state / GPIO to GND vs GPIO to 3.3V

I want to detect a binary switch state - better said a logic 1 or 0 via a PC817 optocoupler - and my question is, if both of these ways are correct: A) Connecting the GPIO input pin via the ...
Tintenfisch's user avatar
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1 answer
66 views

Identify this flyback switching IC "01G262"

I am checking the circuit of a 12V 5A switching power supply. My problem is with the PWM controller IC. The code written on the IC is 01G262. Of course, I am not sure if the first letter is zero or ...
Morteza Hoomanfard's user avatar
0 votes
2 answers
130 views

Collector and Emitter of BJT are always shorted [closed]

I am testing a circuit and i have an npn BJT in that. I am supplying a 5V pulsed source to the base of the BJT at node C. And a constant -5V input at node A. Note the frequency must be 10KHz with 10% ...
Sahasra Vaiishnavi's user avatar
1 vote
1 answer
46 views

Switching 600 V, 5 A with >100 megohm isolation

On our robot, we have several 1.5 kW DC motors (either <350 Vdc @ 5 A max, or <650 Vdc @ 3 A max : the PCB I'm designing should accept both options). The command logic is embedded into the ...
Sandro's user avatar
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1 answer
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BJT not switching properly

Image-1 Image-2 Image-3 Note:- The query is regarding the signals SHUTDOWN, TRIP_TEMP. Ignore the signals GATE_EN, MON_TEMP, ALARM_TEMP Image-1, Image-2 and Image-3 are part of a single schematic ...
Sahasra Vaiishnavi's user avatar
2 votes
3 answers
283 views

Calculation of transistor values using hFE

I provided a very simple NPN transistor set up and hFE values as shown below. 2N2222 datasheet I am trying to calculate parameters such as base current, collector current, Vce using hFE (beta). The ...
Mhan's user avatar
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0 votes
1 answer
73 views

Do all SMPS ICs have an internal dead-time for the MOSFETs, specifically the LTC7878?

I am trying to improve myself in power electronics and currently trying to build a Buck-Boost converter. I chose LTC7878 for this purpose since it meets my requirements. My issue is that while I am ...
OpenBrainedProf.'s user avatar
1 vote
1 answer
70 views

Driving Mosfets using NPN - PNP transistors in Ltspice [duplicate]

I sent the SPWM I produced to the transistor as seen in the diagram below. pwm frequency 10 kHz. As seen in the 2nd picture, PWM-A works fine. As seen in the 3rd picture, I shared the unzoomed version ...
Mhan's user avatar
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0 answers
27 views

Enable/Disable Power of Board with ESP32-S3

I am using TPS63001 Buck-Boost Coverter with a 3.7 Li-Ion Recharable battery. I want to Control Power of the board with ESP32-S3-Mini. Enable pin of the TPS63001 is connected to MCU and its also ...
Zunuran Nasrullah's user avatar
1 vote
3 answers
220 views

Unexpected output distortion when driving MOSFETs with SPWM in LTspice

The first picture below is the circuit diagram. SPWM was used, a full bridge structure and bootstrap circuit was used for the high side MOSFETs. Datasheet IXTH88N30P The carrier signal is 10 kHz and ...
Mhan's user avatar
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1 vote
0 answers
75 views

Is there something wrong with this power-on latch circuit?

I am analyzing an electronic device that has an MCU and the following characteristics: it is powered from a 3.7 V Li-ion battery it has an on/off button that needs to be pressed 1 second to power-on ...
uz3il's user avatar
  • 317
0 votes
1 answer
39 views

Controlling On/off of WL-134 Module with ESP32

I want to control on/off of WL-134 RFID module from GPIO of ESP32. WL-134 requires 9V, 140mA on its input so Basically I want to control 9V input from GPIO of ESP32 when I dont want to use RFID module....
Zunuran Nasrullah's user avatar
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0 answers
63 views

Switching 12V 50A with Arduino

I'm in the middle of building a DIY Powerstation with a 500W modified sine wave inverter. The battery is of type LiFePo4 and rated at 12.8 50Ah. The datasheet of the battery states that they recommend ...
Patrick's user avatar
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1 answer
154 views

Power supply auto cut-off required when there is no audio signal

This is an add-on amplifier and speakers I've installed in the hourly chiming cuckoo clock and attached clock speaker output as an input source to PAM8403. Source: Circuits DIY - Simple PAM8403 Audio ...
Nayan Panchal's user avatar
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0 answers
36 views

Transistor failure in multi channel high frequency AC signals

[Intro] To begin with, I am an undergraduate electrical engineering student working on my senior project. I wanted to make a wireless charging pad like that of Tesla's wireless charging platform and ...
Martin's user avatar
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0 votes
5 answers
149 views

Is there an equation to calculate the voltage spike caused by an inductor in the absence of a freewheeling diode?

I am using a 50V DC power supply to supply an inductive load of 10mH (any kind of inductive load.) I am using a MOSFET as a low side switch. If I do not use a freewheeling diode to discharge the ...
Sudhanva Gokhale's user avatar
0 votes
1 answer
47 views

Driving NMOS source with a separate power supply

I am trying to see whether I can turn on 28 V voltage rail from a 5 V input signal using an N-channel MOSFET (NMOS). I am using IRF530N for now which has a threshold voltage of 4 V. I just modeled it ...
nmr's user avatar
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1 vote
1 answer
70 views

How best to minimize shoot through with push-pull mosfet driver

I am building a custom made portable chisel sharpener from scratch. (Sick of manual sharpening! Can't find a good one!) The plan is to use an 18v battery as power source, and it will see a lot of use -...
Phenomenon Superlative 's user avatar
0 votes
1 answer
44 views

Switchback LED circuit

I hope someone can help me clarify this situation here. I found numerous LED switchback circuits, but none of them seemed to work or achieve what I wanted. I want the white LEDs to be on and when the ...
Halou Gen's user avatar
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0 answers
22 views

16V Smart Load Switch

I am trying to make a "smart" load switch for my device. I have looked for existing options, but have not found something that can control 16V from a momentary switch but can be turned off ...
Andrew's user avatar
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0 votes
1 answer
76 views

SPWM - Frequency calculation

Below is the SPWM I produced with 50 Hz sine wave and 5 kHz carrier signal. I will use the SPWM signal to drive the MOSFETs in my inverter. As it is known, duty and period are constantly changing in ...
Mhan's user avatar
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0 votes
2 answers
90 views

Level translation from +5V (square wave at 200 kHz) to +12V using IRF540N

I want to translate +5V HIGH, 0V LOW logic from Arduino Uno to +12V HIGH, 0.5V LOW logic using IRF540N enhancement type n-channel MOSFET. The circuit I have referred is from https://circuitdigest.com/...
Technaut's user avatar
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2 answers
110 views

Simulation of high side N-channel MOSFET with Bootstrap in LTspice

The inverter circuit I made from N-channel MOSFETs is given below. I used bootstrap for the high sides. Bootstrap capacitors are C3 and C1. The gate voltage of the MOSFET is working properly, the ...
Mhan's user avatar
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0 votes
1 answer
59 views

If a MOSFET is maintaining a singular state what will the power consumption be?

https://docs.rs-online.com/ec6b/0900766b811b5c5c.pdf Taking the MOSFET driver from the attached data sheet (1.5A 30V), if the MOSFET wishes to remain on for a period of 24 hours does it require the ...
Jasper's user avatar
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0 votes
1 answer
157 views

What is the purpose of the 4 diodes in this circuit?

I'm working on a mini UPS for my router (12V, 1A) and modem (5V, 2.5A). I've been checking out lots of DIY UPS tutorials and stumbled upon this one. It seems to do everything I need: it's got a ...
M-125's user avatar
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0 votes
0 answers
25 views

Regarding the equation derivations of the resonant state of an asynchronous buck converter observing zero voltage switching

I'm currently reading this article of Bill Andreycak to understand the mathematics behind zero voltage switching: https://www.ti.com/lit/an/slua159/slua159.pdf?ts=1710666811170&ref_url=https%253A%...
QUEEN SLEAZE's user avatar
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0 answers
30 views

Floating relay terminal in AC circuit causing simulation error

I'm trying to switch between two branches for my circuit. But as the relay switches, the other terminal is left floating. In an AC circuit, I cannot use a pull-down resistor. I also have a feeling ...
Zipho Lunika's user avatar
1 vote
1 answer
75 views

Depletion type MOSFET for dump load resistors in wind turbines [closed]

I recently asked a question to do with dump load resistors for wind turbines see link: MOSFET Driving for a Dump Load Resistor within a wind turbine General Specs: 6kW Wind turbine Dump load: 500 V ...
Jasper's user avatar
  • 49
0 votes
1 answer
43 views

Battery-powered device: trade off between voltage and power requirements

I'm designing a device that would be powered (LiPo I guess) by rechargeable batteries. They will be charged externally. The power requirements are the following: the load runs at 12 V (pump and few ...
Mark's user avatar
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2 votes
0 answers
66 views

Triac flickers when I apply main power

I am building an ESP32-based AC mains power switch by using TRIAC BT136-600D (common triac). My first issue is my load didn't turn off the load (lamp) properly at 30%-40% brightness, and when triac ...
Asif Uz Zaman's user avatar
0 votes
5 answers
91 views

How to switch between two signals with a digital signal?

I have two different potentiometers. Each sets different voltage reference signal for a current source. How can I make an Arduino or any digital signal to switch between these two potentiometers? (No ...
CaveScientist's user avatar
1 vote
5 answers
170 views

Switching with transistor, optocoupler or relay

Looking to make a simple circuit to turn on a 12v buzzer. The signal from the on off switch is 0-1.5v when off and 6.7-10v when on. This obviously isn't enough to power the buzzer, is it possible to ...
Jack's user avatar
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0 votes
1 answer
80 views

Pulling external PCB pin low via NPN transistor. How does it work?

I am redesigning a PCB which hosts an ESP32 and a display connector. One of the pins in this display connector needs to be pulled low or high. On the other side (display) that pin is connected to an ...
Andrea Baccega's user avatar
0 votes
2 answers
71 views

Best circuit to drive +5 V from 3.3 V IC

I am using an ESP32 and I want to cut power to a 5 V component which should draw around 80 mA. On my board I have 5 V, so I created two designs: The first one uses an NPN transistor + P-mosfet -> ...
Andrea Baccega's user avatar
1 vote
0 answers
205 views

Switch 5VDC input on/off using an ESP32

I’ve been wracking my brains with this for several days now. I bought a cheap watch winder and I want to modify it so that I can control the maximum number of turns per day using an ESP32 module and ...
QuestionerNo7's user avatar

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