Questions tagged [pwm]
Pulse-width modulation, is varying the duty cycle of a rectangle wave, usually with a constant frequency.
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Cannot find what causes faults on DRV8353RH
I keep getting faults on a a new batch of ESC boards based on the TI DRV8353RH & Infineon IPT020N10N3ATMA1. Please consider:
When starting a motor at 48V - 56V the DRV asserts a fault after ...
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Trying to identify PWM IC with marking 1WAU its a SOT23 device
I am trying to identify the device 1WAU which i believe is a PWM buck converter, its driving a BUJ302AD transistor. I have searched on google but no luck in finding this device. If anybody can help in ...
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Why does the current THD increase and voltage THD decrease when increasing the inverter switching frequency?
I have a three phase inverter model and I am investigating the effects of an increased switching frequency for pre-defined LC filter parameters. It is a simple MATLAB Simulink model: DC source, ...
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HIP4081A power-up problem
I'm using the HIP4081A in a h-bridge motor drive to drive PMDC motors. The design is working fine when running on 12V but now when I have added a buck/boost converter TPS55165-Q1 so I can run on ...
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What could be burning the schottky diode in this synchronous rectifier?
I have this TV PSU which has one supply circuit for the TV motherboard, which it calls "standby" in the scheme (AO3).
Here's a portion of the AO3 circuit where most of the components I'll ...
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STM32 TIM2 PWM and TIM 5 basic mode simultaneous output issues
Using an stm32f411re I want to generate a PWM of 20% Duty Cycle with a period of 200uS and simultaneously I want a basic timer to be ticking in the background that sends an interrupt every 70uS (that ...
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PWM to synth control voltage improvements
Just built this little circuit to control my Moog Werkstatt. The plan is to make a MIDI-to-CV converter and add more CV outputs and of course a GATE output later. But before going further, I thought I'...
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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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Peltier driver with IR2110
I'm trying to drive a Peltier cell. The driver must allow both operation modes (cold/hot). To achieve this i'm using filtered 3.3V 100KHz PWM from a microcontroller to drive an H-Bridge (as far as i'...
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Motor controller design for Ryobi 40 V 16" Lawmower
I'm attempting to build a soft-start motor controller for a Ryobi 40 V, 16 inch electric mower (to replace a broken factory unit; unit is potted so I can't see/access the guts). Only details I have ...
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LED : Perceived Light Intensity Greater Than Actual Light Intensity (via Weber-Fechner Law)
Background
In this question, user @glen_geek posited (with linked references) that perceived light from an LED versus actual light from an LED is greater at lower duty cycles:
@kando For PWMing LEDs, ...
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Design of a DC motor controller
I want to design a control system to a DC motor using descrite component and not IC component. At the aim is to control the speed of that motor, but at the first time I want to design the inner ...
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Adding PWM function to a XL Semi XL4015 5 A 180 kHz 36 V buck DC to DC converter to create a NUBM44 laser driver board
I am asking this question just to make sure I haven't missed anything important because I am at best a novice when it comes to electrical engineering. What I am trying to do is build a laser driver ...
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Why is connecting an analog servo distorting this PWM-wave?
I'm working on a project where I'm trying to steer an analog servo using a PWM-wave generated by this circuit. I found the circuit design from this article. It consists of three operational amplifiers ...
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PWM driven 24 V fan noise issue
I have a weird issue with a 24 V blower fan. We are driving it with an N-channel MOSFET at a PWM freq of 12 kHz. It has a periodic artifact that appears about 230 Hz or so.
Observable behavior ...
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