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Questions tagged [pwm]

Pulse-width modulation, is varying the duty cycle of a rectangle wave, usually with a constant frequency.

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How to produce an intermittent square wave (produced by XY-LPWM module)?

I'm a novice DIY guy trying to make a PEMF device (Pulsed electromagnetic field therapy). According to a paper I'm reading, I need to produce two PWM waves like this (B0 and B1 in the abstract picture ...
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ATMEGA2560-16AU PWM control using AVR-C

I'm working on a microcontroller board that also features a couple of motor drivers which can be controlled using PWM signals. I also intend to precisely control the positioning of the motors using ...
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2 votes
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I am Seeking Help to Adjust DC Motor Simulation Parameters in LTspice for Accurate Current Modeling

I'm relatively new to LTspice and motor diagnostics, but I have managed to build a PWM-MOSFET control circuit for a DC motor. My goal is to simulate this project to evaluate potential ripple currents ...
Mark's user avatar
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Supply external signal to MOSFET PWM [closed]

I fear I'm missing something very basic here but I want to remove the default signal from the 555 chip on the board and instead input my own. As you can see below I've cut the signal on the board and ...
He Who Asks's user avatar
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PCB trace width for high current motor driver

This post is a continuation of Trace width for PCB motor driver board, with a few follow-ups and questions. Firstly, I'd like to mention again that the motors I want to use have a maximum current of 7 ...
hdaniu's user avatar
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Trace width for PCB motor driver board

This is my first time working on a PCB microcontroller board. I'm working on a project that involves the control of several DC motors with encoders, and I've opted to make my own microcontroller board ...
hdaniu's user avatar
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Why is the filter capacitor (used to filter pulsing DC) overheating MOSFETs in a buck converter?

I am trying to create a microcontroller (Arduino) based DC to DC buck converter with CC and CV features. For now, I am using a 20 V 5 A input source. Output voltage (target voltage) is settable by the ...
irshukhan's user avatar
6 votes
4 answers
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PWM Dimming of a Low-Voltage DC Incandescent Filament (Thermal Shock?)

I plan on driving some Numitron tube filaments from an IV-16 tube (datasheet here). For ease of access I'll give the key specs here: Nominal filament voltage: 3.15V Max filament voltage (steady-state)...
Adzi B's user avatar
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PWMs from microcontroller are resetting

I have been designing an SMPS where the STM32F334R8t6 microcontroller provides the full bridge control signals. The microcontroller board uses a 5 V and 3 V regulator to supply the MCU and the CAN ...
Watermelon's user avatar
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P channel MOSFET for PWM Peltier control (Arduino)

I want to control the power of a Peltier device using a MOSFET PWM controlled by an Arduino. In order to "smooth" the power going to the Peltier, I want to add a capacitor in parallel. The &...
user3256556's user avatar
2 votes
1 answer
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4-pin 12 V PC fan - manual speed control

I've been reading a little about 4-pin PC fans, but haven't been able to find a clear answer. I understand the PWM pin controls the fan's running speed, so if I wanted to use a 4-pin fan for a non-PC ...
MyFingerHertz's user avatar
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How measure fan signal that not seems to the ground isolated?

I have voltronic inverter 3k fan stops with code 01 its mean fan need a replacement old fan in pic-01 its use us62 ic so i order new fan pic-02 and its not working first reason the cables reversed ...
Waled Osama's user avatar
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BLDC Thermofan PWM Controller design recommendations

This circuit is intended to drive small automotive cooling fans (~70W) The gate drive IC is failing when starting from a stall and pops instantly. If current is limited on startup to around 5 A, ...
user_user's user avatar
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Adjusting shift phase of PWM dinamically does not work in STM32

I need to get two PWM signals (PWM1 and PWM2) from STM32F767 Nucleo board when programing with STM32CubeIDE, which are applied to a Full-Bridge DC-DC Converter. PWM2 must be shifted phase in reference ...
Jorge H's user avatar
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How can I properly use PWM to observe hopefully >= 2x normal efficacy, seeing the theoretical max of 1700 lm/W scotopic efficacy?

In a Wikipedia article on "Scotopic Vision", there is a section that states: The maximum scotopic efficacy is 1700 lm/W at 507 nm (compared with 683 lm/W at 555 nm for maximum photopic ...
MicroservicesOnDDD's user avatar
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Problem with the triggering the 555 monostable trigger

I am currently making a dual speed dc motor circuit that is controlled by 555 timers. My goal is to have DC motor full speed below 2V and between 2-3V, the DC motor spins half-speed using PWM from 555 ...
Anson Chow's user avatar
1 vote
1 answer
56 views

Expected voltage when probing a computer PWM-fan socket's sense pin?

I'm using my multimeter to probe a proprietary 6 pin socket on the motherboard of a PC computer that connects to 2 small 25 mm fans. The socket's pins are unlabeled. Both the motherboard and socket ...
Mike's user avatar
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Verify whether the Motor Driver has PWM Support

I was looking for a single channel motor driver with a supply voltage range of 6V - 12V and a continuous current range of 2A. I came across a motor driver IC called SS6285L. This motor satisfies the ...
Kailash Kumaravel's user avatar
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32 views

Convert PWM negative signal to either On or Off signal

I am trying to make a simple conversion circuit to take a negative PWM signal from my cars dome lamp signal and simply make it or or off. I believe I should be able to use a PNP transistor and ...
Jaxon's user avatar
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-1 votes
2 answers
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Thermal efficiency circuit to move an DC electric actuator with PWM

I am looking for a circuit to move an electric actuator with PWM. The actuator is 12V (datasheet) and the normal operating current is ~2A but can reach 8A maximum under some conditions. For that ...
johnnytolengo's user avatar
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Change analogWrite() frequency using the arduino framework for SAMD51

I am using Adafruit Feather M4 Express board which has Atmel SAMD51 controller on it. I am using platformio as IDE, which lets me use this controller using the Arduino framework. I want to change the ...
dreamcoder's user avatar
2 votes
2 answers
141 views

MOSFET driving with 3.3 V PWM signal (using gate driver IC)

I need to drive a 12 V water pump (max. 2 A) with a PWM signal (20 kHz) from ESP32. I have a few questions about my circuit (I am a beginner). I have made the following calculations (Learned from ...
Osk's user avatar
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3 votes
5 answers
674 views

MOSFET driver: Totem Pole or NPN Self-Biasing Turn-Off Circuit

I am building a project, where I want to drive some MOSFETs to control for example a 50W 12V LED and it brightness with a PWM signal from an ESP8266 with a frequency in the range of 1-5 kHz. I found ...
DeltaLima's user avatar
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1 answer
117 views

PWM with PIC817 driving MOSFET seems to be too slow (LED dimming)

I want to drive a MOSFET (IRFZ44N) with an optocoupler (PC817) to control the brightness of an 50 W 12 V LED. The PWM is generated by an ESP8266, 1 kHz. Following schematic is used: In general it ...
DeltaLima's user avatar
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1 answer
99 views

Peltier cooler driving circuit

To prevent closing as duplicate immediately, there is the list of the most relevant questions: How to drive a Peltier element? Driving a Peltier w/ PWM or analog out Driving a Peltier element with ...
Suthiro's user avatar
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2 votes
2 answers
52 views

Charge pump understanding question regarding PWM duty cycle and PWM voltage level

I am playing around with charge pumps / voltage doublers for the first time and have some questions that I can't find anything online to. First, I have a standard charge pump, in an ideal world the ...
Spider999's user avatar
1 vote
0 answers
29 views

In a flyback, why does the Vin supply hit overcurrent protection mode if the PWM controller bias is turned on before it? [closed]

I am working with a DC-DC flyback converter with 60-325V Vin and 60V Vout. I'm using UCC2813-0 by TI as the PWM controller in the primary side. While powering on the flyback, I have to supply Vin ...
moony's user avatar
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1 vote
1 answer
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PWM output with NUCLEO-F429ZI in uVision using just registers

I am using the NUCLEO-F429ZI board and I am trying to send a PWM output signal. More specifically I am configuring the PE9 pin in TIM1_CH1 ...
George P.'s user avatar
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1 answer
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Speed control fan with PWM and capacitor (no pwm fan)

For my project I want to control the speed of a regular non-PWM fan. I was wondering if what I came out with is a good idea or not. I noticed that the capacitor I used (25V 47µF) gets a bit warm after ...
DeltaLima's user avatar
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0 answers
25 views

convert pwm pin to on off relay

I have an ortur laser controller which drives the fiber laser. As i can see thre is red black and on pwm cable. I want to replace the whole laser circuit in picture with just a relay. And i want ...
achinic's user avatar
0 votes
3 answers
81 views

Ghost PWM Signals [closed]

I am an electronics engineering student currently working on a BLDC motor driver project with my team. My role is in software development. We are using the STM32F100RB microcontroller and coding it in ...
Rynxie's user avatar
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1 answer
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How do i make PWM be in the middle of the other one

Sorry if I worded my question wrong, I don't know how I should describe it. I'm making an inverter circuit for my class project. This is my MOSFET driver circuit: This is the output: The 2nd PWM ...
I like custard'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
3 votes
1 answer
326 views

Transistor won't fully turn off when Fan PWM is connected

I'm trying to use a RP2040-zero to control a 12V PC fan that also has a PWM and tach connection. I'm using a transistor to turn off the fan completely as a 0% duty cycle on PWM doesn't turn the fan ...
mpaw's user avatar
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0 answers
29 views

Problems with OCR1B on Atmega328p

Trying to control 4 servos (SG90) using 4 pots on an arduino nano and the one connected to OC1B keeps having problems, with bits of jittering and it just not moving correctly (occasionally spinning), ...
jimothy's user avatar
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1 answer
55 views

Controlling voltage of a device (Peltier cell) without PWM and with high current (max 5 V, 1 A)

I would like to be able to control the power of a Peltier cell, the TEC1-04901, (5 V, 1 A) in such a way as to control its temperature. I have already tried using a PWM control using a transistor ...
Massimiliano Ferrari's user avatar
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1 answer
42 views

Continuous rotation servo with software PWM not working as expected

I have a continuous rotation SG90. I am trying to implement software PWM (because the orangepi sbc I am using doesn't support hardware PWM yet). I got a bunch of electronics from a friend so I don't ...
Yuki.kuroshita's user avatar
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23 views

Regarding Torque of DC Motor with PWM, Atmega328 and MOSfet

I am trying to develop a system having a DC motor (geared 12v 200rpm). There's a rotary encoder to adjust the RPM of the motor. I am using Atmega328 as the main MCU. To drive the motor I am using ...
spdif's user avatar
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1 vote
1 answer
54 views

NE555 PWM Circuit Problem [closed]

I am using NE555 in a care-over project for generate PWM. But i have a problem. On this 12V input path, there is 4.2V on the R1 resistor, although it is expected to be 11.6V. What could be the reason ...
SpeedyGonzales's user avatar
0 votes
1 answer
45 views

PMOS PWM Negative Level Shifting

I'm working on two PMOS PWM circuits and need some help understanding the differences and functionalities of each. The goal is to achieve better wave transients for a PWM signal generated by a 3.3V ...
Fatihy's user avatar
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My motor driver does not work at high load

First of all, I apologize for my bad English. I am designing a BLDC motor driver for my university project but there are certain problems. I use IR2104 MOSFET driver integration for my motor driver. I ...
Hastrolok's user avatar
2 votes
4 answers
113 views

Selecting resistor value for PWM LED driving

I want to create a circuit to drive some LEDs with PWM. The circuit consists of a PMOS switch at the high-side and the gate driven by the MCU PWM pin that is configured open-drain. The LEDs have ...
irag10's user avatar
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2 votes
1 answer
90 views

Control slew rate with low side PWM power transistors

In a special project I'm trying to do PWM current control of a electromagnet like application. This project is special because it has to pass very strict EMI tests (<30Mhz radiated emissions). ...
Jeroen3's user avatar
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0 votes
2 answers
83 views

MOSFET or IGBT for DC Motor

Hope you all have an idea. I've got a DC motor (universal, maybe?) with 2 brushes that was running on 120VAC with a bridge rectifier. Says it's 13Amp. I'd like to PWM drive this motor from battery ...
Not_EE's user avatar
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1 vote
1 answer
66 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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1 answer
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Circuit design for adjusting the electrical load of a small wind turbine (MPPT)

I am trying to make an MPPT controller for a small homemade wind turbine. The goal of the project is the MPPT itself and its performance. The application is direct water heating, and there are no ...
leheim's user avatar
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1 vote
3 answers
216 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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0 votes
1 answer
98 views

I'm trying to make a DIY 10,000 lumen LED grow light and need some feedback [closed]

I’m trying to make a DIY grow light out of LEDs but I really wanna make sure it’s safe so that I can leave it on unattended. I bought a 12v LED strip but unfortunately there doesn’t seem to be a data ...
plshelpadummy's user avatar
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1 answer
69 views

Output of TIP122 drops when connecting a load

I have built this circuit: (the components here are labeled wrong LM317LZ is LM317T and TIP122G is TIP122) When there is no load the output of TIP122 is 10V-20V (when adjusting potentiometer) which ...
Raudonkepuris's user avatar
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0 answers
57 views

Identifying unmarked IC in CNC controller board

I have a Camxtool v3.5 CNC controller (similar to this, although this is v3.4) that has an unmarked IC that I haven't been able to identify: The IC is connected between pin PB3 of the ATmega328P (...
puq_87's user avatar
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