Questions tagged [pwm]
Pulse-width modulation, is varying the duty cycle of a rectangle wave, usually with a constant frequency.
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PWM for three phase induction motor control
I have been implementing control software which shall control the three phase voltage source inverter for controlling the induction motor. There are two requirements as far as the pulse width ...
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Logic Level MOSFET Behaving Unexpectedly Driving PWM Signal to PSU
I am trying to control a MeanWell dimmable PSU with an Arduino. Since I do not want to exceed 60% of the output of the MeanWell, I want to use a 0 to 6V PWM signal. I figured a quick and dirty way to ...
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Some question regarding pwm of PIC microcontroller
Hello guys i have some question regarding PWM.
What does it mean by pwm master-slave?? Why it is called master-slave??
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Why the intersection points in SPWM define the width of the pulse?
After my previous question Why the triangle reference wave is used in PWM for sine modulation I still have some troubles on one particular point of natural sampled PWMs or more precisly SPWM.
My ...
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How to parse this protocol with an arduino?
I'm analyzing a signal from my building's intercom system to my tenant station. Intercom has two wires, +24V/0.27ma, and ground. Every 10 seconds, the system sends a "heartbeat" signal to the tenant ...
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Pulse width modulation for three phase voltage source inverter
I have found a block diagram which discribes implementation of a modulator for the three phase voltage source inverter. I am not sure whether I fully understand this implementation of the modulator. I ...
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Modelling DC/DC-Converter
i want to model a cascaded Buck/Boost-Converter with FAST like mentioned here: https://cbasso.pagesperso-orange.fr/Downloads/PPTs/Chris%20Basso%20APEC%20seminar%202013.pdf.
The goal is to implement a ...
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12 V PWM fan and Wemos D1 Mini - ground loop?
Newbie here.
I'm trying to power a 12 V 4-wire fan and a Wemos D1 Mini from the same power source. The aim is to use a Dallas DS18B20 temp sensor and increase/decrease the fan speed as per the temp ...
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Class D Amp headphones grounding circuit
I am having a problem with some of the class d amps I've played with (PAM8302A), and it seems like this article here describes my problem:
https://www.edn.com/design/analog/4313726/Add-headphones-to-a-...
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SVPWM for BLDC Motors: Switching Losses vs Neutral Point Voltage Swing/fluctuation
I am implementing a SVPWM (Space Vector Pulse Width Modulation) scheme for a 3-phase inverter (3 H-bridges, nothing fancy) to control a BLDC Motor.
Since one can choose which zero vectors (000 or 111)...
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audio output on my FPGA
I asked a very bad question related to this yesterday, sorry - this is more comprehensive and makes more sense.
this is the manual for the nexys 4 FPGA i'm using https://reference.digilentinc.com/...
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Isolated vs non-isolated boost converter for LED (12v to 24v)
I have a 12v system in my motorhome and planning on installing 24v LED strips, however, I'm unsure whether I would need an isolated or a non-isolated boost converter.
I'll be using roughly 5 meters ...
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Designing a constant current pulse circuit
I'm looking for help designing a constant current pulse through a variable load impedance of 10-100k (R4). The ideal response is shown below. This waveform was measured from an off the shelf ...
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Implementing PID in PWM feedback to lower the settling time
I have created the following simple PWM feedback:
The step response is:
I have tried to add PID controller and I ran the following code to test it:
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STM32F407 - how do I run one motor at a time? Why do they ignore delays..?
I'm a newbie. I'm using an STM32F407 discovery board, and I want to control 6 stepper motors using PWM, especially OPM(One Pulse Mode).
Till now I've made 3 stepper motors work using Timer 8 (CH1, ...
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Mosfet Gate Driver IC
Ok so I have burned about 10 MIC4605 (Datasheet here ) gate drivers this weekend. I am unsure as to how they should be PROPERLY wired.
Also have burned 8 out 10 MOSFETS (Datasheet Here )
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STM32 PWM generates excessive pulses
I use STM32F103C8T6 to drive WS2812 RGB LED strip.
So I try to setup TIM1 to generate PWM using DMA.
Everything works fine except the fact that I get more waves then I requested.
Almost all the code I ...
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Peltier Circuit Components
New to electrical in general, so be gentle...
Looking to drive a TEC1-12706 as a cooler/heater, using 24V, 500 Hz PWM as input. To avoid thermal cycling caused by PWM, incorporating LC filter.
In ...
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Low frequency PWM Brushless DC Motor Speed Control
I am programming a L293D motor driver with a BLDC motor to spin at speeds of 60-300 RPM. It is for a hybrid drone/car where I want the motors to spin slowly while having the necessary torque to drive.
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Calculating max peak current at different conditions
I have an IR LED (IR383), and I want to power it with 5v@38KHz. I'm actually calculating the resistor so I need the LED's maximum current. In the datasheet, it says that it accepts 100mA continuous ...
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CCP PWM Strange behavior - Brief failing
I am trying generate a PWM using CCP and change its frequency on the fly, going from 1.15KHz to 3.28kHz in 180ms.
I am using:
PIC: 16F887
Frequency: 4MHz (internal)
Compiler: CCS PCM C ...
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Help with my circuit for PWM of full wave rectified Xmas lights
I want to create a fade up/down circuit for full wave rectified LED Xmas lights that will go from full brightness to nearly but not completely off. Won’t bore you with the working circuit I designed ...
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Best circuit for Zero Cross Detection
I am trying to build an optimal circuit for Zero cross detection for PWM dimming using a microcontroller. I have gone through most of forums and their implementation varies.
I understand that the ...
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Non equal phase currents at nominal speed vector control Permanent magnet synchronous motor
I working on my implementation of vector control for PMSM.
I'm having close loops over speed, current in d axis(flux loop), current in q axis(torque loop). I'm using MATLAB/Simulink for vector control ...
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PWM Dimming Causes Flickering
I designed a 24V PWM dimmer. Basically, it drives a 24V-LED-strip with low-side switching using a MOSFET driven by a 1-kHz-PWM having 1-100% duty-cycle.
There are no problems when the circuit is ...
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Consecutive PWM signals with different prescaler settings
My ATtiny85 circuit generates signals like this one on PB1 (OC0B) using fast PWM (preamble, 16 bit data, stop pulse):
I have trouble with the leftmost longer pulse. At the moment i use simple ...
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Is it OK to drive an LED matrix with constant current?
I bought one of these LED matrix modules as described in this Adafruit PDF.
The PDF says: "they do not have built in PWM control of any kind. Instead, you're supposed to redraw the screen over ...
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Oscillation on PWM output microcontroller
I was trying to create a 20 kHz PWM signal with a PIC16F684 microcontroller.
I noticed some oscillation on the single when I hook my scope on the PWM output of de microcontroller (see image below).
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Problem with Simulation Results VS Tested Results for a signal
For the circuit shown i am having some trouble wondering why my tested signal looks like this (i understand that it could be clipping) but when i measure my circuit in the simulation it is correct? ...
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Can I generate two PWM with 90°phase shift from stm8 microcontroller?
I am using stm8 microcontroller(STM8AF288) to generate a PWM of 1KHz frequency with timer-1(16bit) . I am giving this as input to a circuit， which generates two PWMs with 90° phase shift. But ...
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