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

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I'm doing an environmental control group project for my embedded systems module. I want to generate two PWM signals: Control fan speed from ADC readings from a TMP36 Dim an LED strip depending on ADC ...
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I am building a class d amplifier and need a PWM waveform created by comparing a triangle waveform (5Vp-p) with a audio waveform signal in a single supply (5V) LM311. My audio is coming from an ESP32 ...
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I'm trying to send PWM signal to MOSFET gate to control 12VDC 2A motor. The NE555 circuit is built as shown in this article (https://www.build-electronic-circuits.com/555-pwm-circuit/) with the same ...
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On my camper with a 24VDC circuit, I've a small computer to show the water tanks level and a DC circulating pump with a PWM speed regulator bought on Amazon, regulating at 60% speed. The computer is ...
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I have a vehicle with generator style speed signal generator and its output is linear from 0 -30VAC. This signal is used by the Dash mounted speedo without any issue. I now have a mandated requirement ...
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I intend to connect the output of a push-pull type buffer IC, SN74LVC2G34, to: a) a LED (for debugging and monitoring purpose) b) a gate driver IC (1ED3142MC12H) I simulated the following circuit to ...
ankit kumar's user avatar
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I am making a project to control speed and position of multiple 3 Phase BLDC Motors using a Raspberry Pi 5. I am struggling with the number of PWM channels I will need and the lack thereof on the Pi ...
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Let's say I have the following setup: 24VDC PSU → PWM Dimmer with 5A outputs → Incandescent 24V 40W bulb While the 40W bulb consumes only ~1.5A, its inrush current is about 10A. The PWM dimmer has no ...
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PWM signal to be generated from MAX6966 at 5 kHz with duty cycle varying from 1% to 99%. This PWM signal is fed into a line driver SN65LVDS1. Then using a 10 meter shielded twisted pair of wire, this ...
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I need some help choosing the best flyback protection circuit for an inductive load driven by PWM. I’ll attach a simplified schematic of my circuit along with test results for each protection method I’...
Lucas Marino Torres's user avatar
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I have disassembled a 20V cordless drill. It uses a two-lead brushed motor controlled via a PWM signal. Out of curiosity I connected both motor leads to an oscilloscope and measured both against a ...
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I'm looking for advice on how to properly design a flyback protection circuit on the PCB for an automotive application, where the supply comes from a vehicle battery and the system must handle GND ...
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I was browsing the web for the prior works on the PWM demodulator implementations, and I found patent US4408166A, "Pulse width modulation decoder" from 1982. I cound not obtain the vo ...
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In the book 'Fast analytical techniques for electrical and electronic circuits' by Vatché Vorpérian, the DC and small-signal equivalent circuit model of the buck-boost converter is obtained by ...
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I’m working on a small robotics project and trying to control DC motors. I’ve come across terms like PWM motor control and H-bridge circuits, but I’m a bit confused. From what I understand, PWM is ...
Ednexllc global's user avatar
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I initially used a 74HC04 to drive the MOSFET gates. This was initially because I wanted 5V on the gate: by putting the pwm 3v3 through the 74HC04 and then re-inverting the pwm came out st 5V. I chose ...
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I am working on an STM32H743 project where I need to read ADC data synchronized with a center-aligned PWM signal generated by TIM8. My goal is to ensure ADC sampling is correctly aligned at the center ...
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IC MPN- FODM2701R2 I am giving If=5 mA current through diode. CTR is 300%. Ic current through transistor will be 15 mA. R1=0 Ω. R3=1500 Ω. Therefore I am limiting the max Ic current to 3.33 mA. ...
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I'm stuck with simple AST0940MCQ, I'm not able to get any sound from it, here is my sch R41 is connected to MCU where I generate a PWM signal 4kHz, check with my oscillo pwm is fine. If I check ...
simon's user avatar
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TL494/TL594 has several features that make it versatile. A wide duty cycle range, from 0% to greater than 90%. Exposed comparator pin and open-collector pull-up feedback amplifiers allow for direct ...
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I need to make a gate driver for a P-channel mosfet. I plan to use a PWM signal from a microcontroller with a maximum amplitude of 3.3 or 5V. After searching for a circuit on the Internet, I found ...
Rodney's user avatar
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I’m building a USB IR blaster using a CH552T dev board, a Crowtail IR emitter, and an HS-S23B receiver connected to an ESP32. My goal is to send NEC protocol IR codes at 38 kHz using Timer2 for the ...
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I’ve been working on implementing DShot150 on an Nucleof4 development board using HAL drivers with DMA, driven via a timer. I followed the DShot using HAL drivers implementation and even extracted the ...
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I've been going through a few datasheets for 4-pin DC brushless fan with Pwm and Tachometer functions. I've attached one of them here for reference. However I couldn't understand the tachometer part. ...
nk backup's user avatar
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I'm working on a circuit that converts a 3.3V PWM signal to 5V (level translation). I'm trying to implement this using a single MOSFET. The circuit works fine at lower frequencies, but at higher ...
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I trying to program the ADF4001 in order to make a PLL with an N counter and R counter of 1, but I have no output on the CP pin. I am unsure if it's the way I am programming the chip or the layout I ...
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The transformer (Mfr.Nr.: PH9400.111ANLT) is causing a delay of about 50ns on this 150KHz, 3.3V PWM signal. Are there hints to deal with this delay and distortion? This signal (S1) is driving a MOSFET ...
Elektroneu's user avatar
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I have built a device containing a Murata PKMCS0909E4000-R1 passive, piezoelectric buzzer (Link to datasheet). According to the datasheet, its sound output is highest around a frequency of 8 KHz, so ...
Alex's user avatar
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My fan requirement is 180mA while the transistors I have has a maximum collector current rating of 100mA, thus, I resorted to using a parallel arrangement as shown. I have done some calculations &...
nightcrawler's user avatar
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I'm trying to generate PWM signals for a stepper motor with a PCA9685 development board and an MCU (STM32F4). I'm able to write and read all commands to the chip via I²C — and verify that everything I ...
ulix's user avatar
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I'm using the FOD3180 as an optocoupled gate driver to drive the gate of an N-channel MOSFET (STB130NF7) in a low-side switching application.The application is intended to switch at 10 kHz, with the ...
Lucas Marino Torres's user avatar
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When I read about power delivery or motor powering, there arises a technique called Pulse Width Modulation (PWM), to reduce power loss. Here, the voltage supplied is given in a pulse form, instead of ...
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I want to add sound to a microcontroller project, using PWM, and I came across this blog post with the circuit below. With a cutoff frequency of 100Hz, doesn't this heavily attenuate all audible sound ...
Mike's user avatar
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I am trying to use the following LED: https://www.flyrobo.in/3w-3000-15000k-high-power-white-smd-led-light-beads-purewhite?tracking=ads&tracking=4a9a9a&gad_source=1&gad_campaignid=...
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I am trying to convert a PWM signal generated from MCU which can only output 0 - 5 V but I want to drive an ECM fan which requires 0 - 10 V analog so I am using a MOSFET to switch 10 V supply by ...
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I'm trying to drive a 110V motor using H-bridge circuit, by programming a STM32F051 using C language. The problem is when turning a motor there are overshoots to the negative value (-110V). Can ...
Sbusiso's user avatar
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I have a 2 kHz PWM signal (500 µs period). The pulse width varies from 125 µs to 250 µs and can take any value between them. How can I double the pulse width duration, and as a result, the duty cycle ...
Marian's user avatar
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I have a drone flight controller that outputs a OneShot125 2 kHz PWM signal. The pulse width varies between 125 µs and 250 µs and represents the information being transmitted. The flight controller ...
Marian's user avatar
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I have the circuit below with all the components the same, except the PMOS being a SQD50P04-13L_GE3 MOSFET. The PWM signal that is sent from the STM is from a 216 MHz clock with prescaler 100 and ...
Nicolas Fontenai's user avatar
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When designing an inverter from scratch, what factors should be considered in selecting the switching frequency? Specifically asking for: 20kW - 40kW traction inverters for motor control using SiC ...
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I am running some tests on a wye wound BLDC to understand the relationship between duty cycle and charge for a given PWM period. I am slowly linearly increasing the duty cycle off just one phase. ...
Eman's user avatar
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I have designed this PWM generator: ...
Root Groves's user avatar
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Consider the following PWM D/A Converter that I would like to use. I saw a similar concept once on a commercial device, and since I now need an adjustable voltage with high resolution, but not fast ...
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I need to design a three-phase inverter for motor control and isolate microcotnroller from power stage (gate drivers + transistors) .. look at the image If I use LM5018 as flybuck, at the output there ...
KaleM's user avatar
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I'm a mechanical engineer with some light knowledge of electronics. I might not understand immediately, but whatever knowledge you provide I'm sure with enough hours of googling I'll be able to figure ...
Evan Ro's user avatar
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I have built a half bridge resonant inverter using the Infineon 2EDL05N06 series gate driver (datasheet) and power MOSFETs, and it seems to be generally functional. I am controlling the gate driver ...
diego's user avatar
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Suppose the current output (and, therefore, capacitor voltage) is 0V and the PWM DAC is commanded to output AVDD/2. Conventionally, it would set the duty cycle to 50% - which is the value that works ...
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I'm trying to generate output frequencies from 0 Hz to 10,000 Hz using STM32F407VET6 with Timer2 in Output Compare Toggle Mode. The timer clock is 84 MHz. I need to achieve: 0.1 Hz resolution up to ...
kumar's user avatar
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I designed a PCB using the DRV8837 motor driver. While testing it, I'm getting some behavior that I don't understand so I was hoping someone could shed some light here. My circuit is pretty much just ...
catlover's user avatar
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Is it possible to read PWM signal on OrangePi Zero 2 W (Allwinner H618) using the board's hardware? The problem is: I'm sending PWM signal using Jetson Nano and I want to read it on OrangePi Zero 2W. ...
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