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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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PWM using PIC10F200

I want to generate PWM using PIC10f200 SOT. Can anyone guide me where to start or tell me the code? Also, tell me if you need other data. The purpose is for MC to generate a PWM to turn on LED without ...
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2answers
89 views

Control the RGB tape with only one output of the microcontroller

I need to control the colors of an RGB ribbon. This requires 3 PWMs. But I have only one output of my microcontroller available. So for this I need to find a circuit that stays between the ...
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31 views

How to determine PWM Frequency of a MOSFET to drive a BLDC motor?

What are the factors determining the PWM Frequency of the MOSFET driver circuit that drives a BLDC motor. Is there any equation for PWM calculation? For eg. I need to control the speed of a BLDC ...
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70 views

Voltage controlled voltage regulator?

I have a voltage that's used to dim a 12V bulb and I'd like to use it to dim an LED instead. My plan so far is to use a triangle generator and a comparator to make a PWM signal with varying duty cycle....
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1answer
34 views

Controlling the brightness of LED panel via GPIO pins

I'm trying to control an LED panel like the one in this link. I notice it comes with an LED driver. But what I'm wanting to do is to be able to control the brightness of this light through the GPIO ...
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1answer
34 views

How to change a predefined PWM frequency?

I have a controller which has predefined PWM frequency of 150 Hz. This output is used to control a motor. However, I want to use another PWM frequency, but I can not change the PWM frequency on my ...
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24 views

How does using PWM generator to control inverter work in Simulink?

I am trying to model a PV system connected to the grid and use PWM generator to synchronize the inverter output with the voltage condition on Grid. I figure I need to use Three phase PWM Generator ...
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2answers
35 views

Avoid voltage feedback from laser psu to Arduino via pwm pin [closed]

I have been using GRBL software on arduino board for quite a while now, however the only issue I have is that the CO2 laser PSU kind of passes a small current back to the Arduino from its control pins,...
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82 views

Not sure how to go from PID error to PWM duty

I am trying to learn the basics of PID. I have made a contraption to try to implement a PID controller. I am not using carbon fiber, but rather a chopstick. So I am controlling the speed of the ...
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56 views

4-pin PC Fan PWM control and speed monitoring

I want to control and monitor the speed of a 4-pin PC fan using an esp8266. When there is no PWM control signal sent to the fan from the esp this code reports the fan speed correctly. However, ...
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3answers
66 views

MOSFET Heating in LED Driver Circuit

I have designed LED Driver circuit using IRF540 and use PC817 Optocoupler for isolation. However, the MOSFETs are heating too much after giving the PWM Signal. One of my LED panels is 110W. What ...
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156 views

Why is current controlled feedback faster than voltage controlled feedback in PWM controllers?

Looking at modern ICs, we prefer current control feedback over voltage control feedback, due to the speed of the feedback. Current control will react faster than voltage control. Here are 2 images, ...
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86 views

Driving MOSFET with 5V PWM for 12V fan speed control

I came up with this circuit to control a 12V 6A fan's speed, with a 5V PWM from another circuit. I'm not sure if it's going to work (I'm not very experienced nor knowledgeable in electronics) and I ...
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2answers
58 views

555 as slow PWM driver

I would like a slow PWM output, driving a relay turning an AC heating element on and off. I desire a period time of around 10s. What is a realistic upper period time limit for a PWM circuit like the ...
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1answer
25 views

Need to synchronize stepper motors

am using two A4988 drivers to control two NEMA 17 stepper motors with 1.8 degree full step resolution on Rpi 2b. I am using them as wheels. The motors are initially given ramp signal using PGPIO ...
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47 views

What methods exist to introduce dead-time in a MOSFET H-bridge? [closed]

What methods exist to introduce dead-time in a MOSFET H-bridge? (to prevent shoot-through) (other than software methods, or using MOSFET driver ICs with internal dead-time generators)
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Fiterless Class D amplifier: the PWM and Switching stage

What is the minimum voltage and current to drive a MOSFET switching stage for a filterless class D amplifier having 86% efficiency? What ae the calculations needed to find this out?
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156 views

damping ringing in stepper motor phase current

I am modifying a stepper motor control circuit that uses Allegro A3959SLB PWM motor drivers. The purpose of the modification is to drive a more robust stepper at its rated 2A rms current, driven by a ...
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2answers
39 views

Can i use IR2110 for two independent MOSFETs?

Can i use IR2110, and feed it with two independent PWM signals, to drive two independent MOSFETs, each controlling a separate motor? (or high side and low side inputs/outputs of this chip gonna affect ...
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1answer
50 views

Control a fan motor (with PWM IC burned out) [closed]

After the IC fan controller burned out by a voltage error I pulled it out to see what the motor coils were like. They are so I think: 4 series coils, but I'm not sure if it's the 4 coils in series. ...
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21 views

Question about Space vector modulation

Currently I'm learning about SVM and I have a question. If for example SVM method is applied to an inverter for motor control, is it necessary to know the values of the three phase voltages for ...
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2answers
42 views

My transistor used in a transistor amplifier does not get turned off with PWM based input

I am working on a project; driving a DC MOTOR using an NMOS MOSFET amplifier and Arduino PWM signal. My problem is my transistor amplfiler is always on when I vary the PWM input value from 0 to 255. ...
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2answers
34 views

Run actuator at higher voltage and with lower dutycycles

I have an actuator which is rated at 12 VDC input voltage (0-15) with a maximum allowed duty cycle of 20%. The already existing voltage levels in my system are 5V and 22V, and since I am weight ...
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1answer
42 views

3 Phase calculations

I have 3-phase utility mains power supply whose phase voltage is 220 V, 50 Hz. I keep getting confused about various calculations of the 3-phase mains as follows: Formula for the line voltage. ...
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1answer
44 views

Should I use constant current or constant voltage drivers for driving my PWM 24V DC Fans?

Hi everyone thanks for stopping by to lend your thoughts. I need to run 2 circuits separately and control via Arduino uno PWM. One circuit is 2x Noctua NF-A14 industrialPPC-24V-3000 Q100 IP67 with ...
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1answer
115 views

How would a mains transformer react to unfiltered “Class D” PWM sinewave on its primary?

Somewhat related to this question: How do I apply PWM signal to the primary side of a transformer to get synthesized sine wave at the secondary side? - specifically "Choice 1": However in my case I ...
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1answer
56 views

PWM speed control of 24V DC Brushless Pump

I would like to PWM speed control a 24V 2A DC Brushless Pump using an Arduino for my nano-brewery project. I've been searching for a Speed controller on Amazon or Ebay. But, i either find brushed ...
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1answer
30 views

speed control PWM, DC motor, L298n with LPCxpresso 1549

this is my first post and I'm just asking a little bit about motor control in a team project, where I'm member of. This is a bit of a "not so serious" project so probably the solar panel system ...
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2answers
69 views

Extend number of PWM pins on an arduino?

How do I extend the number of PWM pins on an Arduino without using software solutions, I need 32 to drive 32 mosfets? Thanks!
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2answers
425 views

Trying a PWM audio application. I can't figure out why I'm getting a loud beep overlapping my sound

I want to play some short audio clips (they range from 50ms to 100ms) from my atmega168 microcontroller and output it to a cheap speaker. I was following this tutorial but because I'm using a ...
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1answer
92 views

How to connect LED driver to arduino

How do I connect 2 of these LED drivers to Arduino? http://www.starchips.com.tw/pdf/datasheet/SCT2024V01_03.pdf This is what I have so far, im connecting each output to a N-channel mosfet. Im not ...
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2answers
88 views

Do i need a LED driver to drive 32 mosfets? [closed]

Im trying to use two 16 channel LED drivers to drive 32 mosfets, im not understanding the datasheet about current sinking, maximum voltages etc. Are they meant to drive the LEDs by themselves? ...
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Arduino Uno vs Arduino MKR1000 analogRead discrepancies [migrated]

I'm using an Arduino to control a BLDC motor connected with the motor driver. It is just a simple control which I'm using a PWM as a signal. Before this, I'm used Arduino Uno pin 5 to control BLDC ...
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22 views

IGBT Power Calculation in motor control application

My DC motor's nameplate says: VOLTS: 125 AMPS: 27A HP: 4 HP RPM: 5000 RPM DUTY: CONT. I chose this IGBT IKW50N60DTP to drive the motor with a PWM frequency of 5 kHz using a single-quadrant ...
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1answer
43 views

PWM as a voltage regulator for 12V wiper motors and 14.8V LiPo

I'm using 12V (~40W) car wipers motors for small robotic project. Motors are driven over MOSFET H-bridge (IRF1405/IRF4905) with PWM speed/power regulation. Currently a voltage source for motors is a ...
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26 views

PWM Duty Cycle Threshold Switch

I'm trying to make a switch for a PWM signal. I am controlling a PWM signal however I can only control the duty cycle from 50% - 100%, for various reasons I can't change the controller. I want to ...
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47 views

level-shifting a 5V pwm signal to 10V for speed-controller using a mosfet - looking for help solving voltage drop problem.

I have tried to solve this by googling, reading datasheets and discussion. Made a bunch of breadboard designs and finally got one do what it's supposed to on the breadboard. But suffers a voltage drop ...
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47 views

How drive two servos using BBC micro:bit using JavaScript?

I'm playing with a BBC:micro using EspruinoJS and I'd like to control a couple of Feetec FS90R continuous rotation mini servos(datasheet pdf link). I had no luck using ...
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36 views

Pwm DC output smoothing

I'm in the process of assembling a big 25Ah 4S (16.8 v when fully charged) battery pack. The plan is to multi-purpose that to different DC output voltages so the PWM choice felt natural. Now I want ...
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1answer
78 views

Mosfet Motor Drive amplifying duty cycle of PWM

I am receiving PWM signal at 7.8V from a given controller, with which we need to control the speed of a DC motor at 18 V. I implemented the following circuit for this. However, the output to motor ...
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1answer
32 views

0-5 to 0-12 volt level shifter at high frequency

what is the best way to shift PWM at 500kHZ from logic level 0-5 volt to 0-12 volt to drive a mosfet? answers here were no good they only work for lower frequency and pwm is distorted at 500kHZ ...
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1answer
41 views

Controlling speed of 7 DC motors from Arduino 101 using PWM outside of the audible range

I am researching a way to generate PWM for 7 independent DC motor drivers, each connected to a 12 V DC motor. The drivers take in a PWM signal, a direction signal and a 12 V DC supply and use this to ...
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48 views

Mosfets heat up in a BLDC controller

I am trying to build a bldc controller. I have the following schematic I should mention that for the gate drivers I used ir2101 ICs. Everything works fine but when I connect the motor (350w ...
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1answer
42 views

Plateau in collector-emitter voltage during BJT turn-off

I have the following circuit that uses a NPN transistor as a switch: I've built the circuit on a PCB, and while testing I noticed the following plateau in Vce (blue trace) when Vb transitions to zero ...
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32 views

DC motor speed calibration

I have seen some treadmills with DC motors that have an option in the console to calibrate the speed sensor by making the motor run from 0 to max speed. Also, some of them have an external ...
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60 views

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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1answer
78 views

STM32 cant get DMA on PWM

I wish to drive a set of NEOPIXELS (ws2812b) using the STM32F4 discovery board, so far i managed to get a 800 kHz PWM signal using the CubeMX. And And the following code: ...
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18 views

PWM Opto-Isolator Inline Volume Control for external source to Amp (Rpi Project)

My project uses a Raspberry Pi to mute a stereo audio source (could be a CD Player, iPod etc. at line level) that is connected to an Amp. This takes place at specific times of the day. Wait a ...
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2answers
64 views

Brake DC MOTOR circuit

I have a DC motor that is controlled with an npn transistor with pwm. Everything works fine. I want to brake the motor instantly. I tried to short the terminals with another pairs of transistors but ...
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22 views

MC33926 Motor Control Rise Time

I am using a MC33926 motor controller. Unfortunately, I am not extremely familiar with motor controllers and have a question. The circuit below shows the circuit that I am working with. The drivers ...