Questions tagged [pwm]

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

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Unsure of PWM frequency for HobbyWing Platinum-60A Brushless ESC

I want to program this ESC HobbyWing Platinum-60A Brushless ESC (Manual) I want to first try it using Arduino's Servo Library and then using STM32F4. From its manual: It says that it requires PWM ...
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What is the result of deviating from the Kelvin layout when designing a current sensing PCB?

For a two terminal current sensing shunt resistor with a layout that deviates from the symmetric Kelvin layout, what results should be expected? For example, with this layout, what result would be ...
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How does HFI (high frequency injection) work with BLDC motors

How does HFI work with BLDC motors. In this video: VESC HFI: Sensorless position tracking at zero speed he explains how HFI works, however i don't get how it can work with motors that have trapezoid ...
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PIC16F887 PWM multiple output

I am trying to design a control for a BLDC motor with a PIC16F887. I have managed to activate a PWM output and be able to vary it with a potentiometer. The point is, I need to get 6 PWM signals out. ...
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Activate 3 or more PWM signals in PIC

I am doing a PWM with the PIC18f4550 and it managed to do it. But only activate an output by varying the value of CCP1CON. What I want to achieve is to have three PWM outputs and then be able to ...
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41 views

PWM Three Phases with PIC

I am trying to program a PIC18F4550 to control a 3 Phase BLDC motor. I have doubts about how to make the program, since I have seen many examples that what they do is use the TIMER to generate the 3 ...
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Difference between SVM and sinusoidal PWM in BLDC

In this answer Answer to question regarding difference between 6-step and FOC, the author said: "Likewise if you have gone to the effort to implement a FOC you might as well implement a SVM block to ...
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SG3524 for Mosfet gate driver

I want to use SG3524 for generating a PWM signal of 200kHz frequency to be provided at the common base for the two complementary transistors SS8050 & SS8550. This is to be a gate driver circuit ...
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How do I work out the correct PWM frequency for my application (motor)? [duplicate]

I am working on a project and want to drive a motor with a 12V PWM signal (Motor connected to 12V and the Motor- net on the diagram). I have it working, however i'm not sure how to work out the ...
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99 views

Using 555 timer with soil moisture sensor

I am using an IRROMETER sensor for soil moisture measurement. This sensor requires AC excitation, so I found an interfacing module for it from online. This is the circuit recommended by them: The ...
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How to obtain R1 from MAX31740ATA+T equation?

How to obtain R1 from MAX31740ATA+T equation ? The equation:
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How to determine LED dimming method

I'm just starting to get my feet wet with electronics so please pardon my ignorance. I bought an LED light-bar to mount to my mountain-bike for some night riding: https://www.korrlighting.com.au/...
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How to run a PWM controlled fan at 100% all of the time

I've salvaged a Nidec G14T12BS2AF-56J14 fan from a broken Playstation 3 which I would like to use to make a dust blower for PCs. As a test, I've connected the fan as follows: Brown: 12VDC Black: ...
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High side sensing of pulse current

I try to make high side current sensing from discrete parts (for understanding, this no commercial solution nor student project, just home stuff) for PWM motor driver (buck converter without LC filter)...
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PWM signal not visible upon increasing the scope time base

I am capturing 2 different PWM signals. The frequency of first PWM signal is lower when compared to the second one. Please check the waveforms. All the waveforms are taken of the same two signals. ...
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Why Gate voltage must be higher than source voltage in N-MOSFET as High side switch?

In many circuit, like buck converters, MOSFET used in high side for switching, I've came across the term that Gate voltage with respect to ground must be greater than source voltage by +8V. For ...
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What chip to convert 0-5V from sensor to pwm 0-100% [closed]

I need your recommendation guys. Requirements: static frequency of about 0.1-1Mhz, input: voltage of 0-5V, output: PWM with duty ratio of 0-100%, standalone chip - no additional active components ...
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How to handle duty cycle below deadtime in 2- and 3-level inverters

When programming a pwm for a 2-lvl inverter what would be the suggested strategy for a duty cycle close to 0% or 100%, meaning when I cannot guarantee for dead time. What would cause less distortion ...
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Buzzer Voltage and Current waveforms

I have a buzzer circuit. Waveform : My questions : I have marked the points in the circuit where I am measuring the voltage and the current. PWM pulse is given to the base of the transistor. I ...
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SMPS chopper stage

Please what will the output waveform of a PWM signal look like after being switch by a MOSFET or transistor - especially in SMPS. Will the frequency or duty-cycle of the pulse increase or decrease or ...
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Conducted Emissions of EV Charging Electronics

I'm building an AC-charging device for electric vehicles (the standard calls it an "ICCPD" or an "In Cable Control and Protective Device") and I'm facing some EMC issues due to the PWM Signal on the ...
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Part number Molex 4 pin wire-to-board connector and 2 pin wire-to-board like Corsair CommanderPro

I'm having a really hard time finding the correct PN for a 4 pin header, used with PWM fans. The header I'm looking for is a 4 pin one, similar to the Molex 47053-1000, but a right angle one. I've ...
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68 views

I need to vary the duty cycle between 50% and 70% of a PWM signal

So I used a comparator to compare a sawtooth signal and a reference voltage and I obtained the PWM signal at the output of the comparator. My question is what formula can I use to vary the duty cycle ...
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Wiring an air conditioner blower motor in a Ford Mustang

I am having some wiring issues with my vehicle following a fender bender. Everything on my air conditioner works as expected except for the blower motor. I can confirm it is a new blower with issues ...
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12V PWM to Analog DC converter for car cooling fan

I’m installing two 12V 80W cooling fans in an old BMW which originally uses a PWM electric fan. This original fan has a three pin connector (constant 12v, ground and PWM signal from the ECU). I ...
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102 views

H Bridge runs for few minutes and MOSFETS start smoking

I have created an H bridge as shown in the schematic below. PWM signal to the MOSFET driver is given by a microcontroller running on 5V. The MOSFETS are screwed to heat sinks. To control the motor ...
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PIC32 PWM 180 Phase Shift

So I have two PWM outputs configured in my PIC32, with PWM2 duty cycle 100-PWM1 Duty Cycle, where the objective was that when PWM1=0 PWM2 would fill the rest of the cycle so an 180º phase shift I ...
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Help finding an appropriate driver for brushless motor

I have a 28mm wide dc motor in the device pictured here. I have removed the control board of the device and am looking to replace it with an external driver board with RC PWM inputs for control. The ...
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57 views

Schottky diode as a flyback diode with PWM?

I found similar posts but need little more hand-holding - no engineering background. I tried to document the circuit to my best ability but i recognize its far from perfect: I was reading these two ...
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Amplify PWM output from 3v3 to 10v using an amplifier

Actually I'm already using an amplifier to convert from 3v3 signal to 10v signal. Since different consideration like pin and board constrains, I'd like to use the same amplifier circuit to output also ...
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Cooperation of the ADC and PWM modules

I am going to implement field oriented control of the induction motor on Zynq 7020 SoC. My idea is to use the integrated ADC module (XADC) and implement the PWM modulator in the FPGA. I need to have ...
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How to implement Software PWM on an AVR on a timer ISR? Failing to grasp the maths for this

Say I have a timer running on an atmega328 8MHz like so: ...
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How to check maximum frequency generation capability PWM of microcontroller?

I am new to Texas Instruments Controller. By checking the datasheet how can we come to know about the maximum output frequncy generation of PWM of the controller. Is it related to the clock frequency ...
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476 views

What is a best way to get a 25% duty cycle square wave (5 V, 1 MHz) on a board?

I am trying to get two off-phase 25% duty cycle square waves(1MHz) to control a full bridge circuit. Update:Sorry for the confusion here, what I mean was to have 2 square wave signals, and introduce ...
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Transition between two pwm modes

I am going to implement on mcu following pwm for three phase voltage source inverter controlling the induction motor. The pwm will have two operation modes: 01) asynchronous mode where a/d ...
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1answer
24 views

Locked Anti Phase PWM and BLDC makes sense?

Locked Anti Phase PWM is used to drive brushed DC Motors, but does it make sense to use it for a BLDC, e.g. 3 Phase Motor?
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DC Motor pwm control and flyback diode question

Suppose we are controlling a dc motor via pwm. he motor has a flyback diode across it. Question : During pwm off period, the motor current freewheels through diode. Won't the motor experience a ...
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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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Can't simulate simulink model

I'm trying to simulate the following chopper controlled dc motor in MATLAB Simulink using a PI controller. Now without the freewheeling/flyback diode across the motor terminals I can simulate the ...
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Is there any module that controls power supply with variable voltage by PWM input? [closed]

I am stuck for a few days already at finding a solution for controlling a motor. We can easily find a motor or LED on the market. However, those modules for motors do not have a built-in regulator as ...
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61 views

How to determine resistor value for PWM signal?

I have 8 fan modules that contain 2 fans per module. These 16 fans are powered by 12 VDC and are controlled by the PWM control pin. The spec sheet for the fan module: https://www.delta-fan.com/...
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83 views

PIC Alternate Pin Function for PWM

I am using a PIC12F1571 which have 3 PWM pins and two alternate PWM pins. What I want to achieve is to use the 3 original PWM pins and the switch to an alternate pin in software in order to get a 4th ...
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PWM Communication without external hardware

I'm working on project related to J1850 bus. to my understanding, it's just a PWM communication, but circuits I found online include some extra hardware (example). What does circuit actually do? ...
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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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Does PWM power supply divide the current drawn of a non-inductive Load along with the divided apply voltage?

Let say I have non-inductive Load and it is rated as follow: 0.2A @ 1V applied 2A @ 5V applied Which is powered by a DC battery and is rated as follow: 5V output 1A max current supply I am going ...
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Motherboard with 4 pin and fan with 3 pin

This is my first question and I'm a little tired to do more and more research. So I decided to ask and please let me go straight to the point: The fan connector of my motherboard has 4 pin and the ...
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50 views

Driving two parallel LEDs with PWM brightness control and a “LED selection” signal

I am working on a LED board for a flashlight powered by a 3.7 V battery. The flashlight have a dual light feature : both white and UV light are available. Four signals are sent to this board by the ...
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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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45 views

Braking a small hall sensor BLDC motor on a ballscrew

I want to create a simple circuit (or better, add software change for the existing circuit) for deceleration of a small BLDC motor connected to a ball screw. Exact stopping at zero is not a ...
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85 views

1.5V to 30V fixed frquency PWM generator

I've need a circuit to take analogue power from a model train track (0-20V DC) as it enters an engine, then apply PWM at a reasonably fixed frequency (say 200Hz), and use this to drive the motor, so ...

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