Questions tagged [h-bridge]

A circuit which allows power to be applied to a load in either direction. Often used for reversible motor control.

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19 views

Non-zero voltage between unloaded h-bridge output and input

I have an unloaded h-bridge, with the following layout: U6 & U9 are totem-pole mosfet drivers--nothing particularly exciting there. When I have Q1 & Q7 on, I find that there's 70mV between ...
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46 views

H-Bridge current limiting

I am designing a simple H bridge circuit for use with the Atmega8 microcontroller. The DC motor moves this application a lot and generates 140 mA current spikes (DC motor locked) or 60 mA with normal ...
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60 views

How can I calculate the dead time to prevent shoot-through?

From Figure 1 is evident that to get the dead time I must define the values for RC. E.g my resistor is 220 ohms and capacitor is 0.1uF this gives me 22us at 1-time constant, however, when I measure ...
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42 views

Back EMF protection of a bi-directional inductive load

I have been researching this subject for some time now and I found three ways to deal with this issue but I can't make up my mind on which one is the best for my application. I have a high torque 12V ...
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62 views

Problems H-Bridge on PCB taking all the current

I try to make a system to lift up and down a door for a chicken coop. When I did it on a breadboard, everything was working correctly but now that I use a PCB, when the H-Bridge is connected, the ...
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26 views

Facing problem in converting single phase arduino code into three phase for 5 level inverter

I am making 3 phase inverter using 5 level inverter technology using arduino nano. The code i am having is for only single phase 5 level inverter but i want to make 3 phase inverter using this code ...
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54 views

Half H-Bridge using IR2104 doesn't work

I'm trying to build a half H-bridge using an IR2104 driver. I want to use it for driving "high power" things such as a brushless motor (100V, 40A), or high power LED (200W). But it doesn't ...
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49 views

Calculating the MOSFET gate resistor for an H-bridge driver

I'm designing a DC motor driver using Allegro's A3941K driver. The block schematic shows a gate resistor for the MOSFETs. The A3941 gate structures are as below, The ...
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54 views

Getting More Power out of an H-Bridge

tl;dr: how to design an h-bridge to give more power to motors. pre-fab circuits are not an option. Hi, so for my electronics class we have to build robots from scratch. So no pre-fab circuits (with ...
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1answer
29 views

Connecting many electromagnets with polarity control

I'm trying to see if it's possible to build a large grid (hundreds) of electromagnets, where very electromagnet should be able to get both directions of currents (to generate magnetic fields with both ...
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1answer
96 views

TLC5940 resets itself when driving certain DC motors

So I had the following setup: I was just driving a small DC motor with this circuit by either sinking current on pin 0 or 1 on the TLC with a motor voltage of 5 volts and everything was fine. The ...
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4answers
113 views

Energy conservation when adding braking resistor to H bridge?

This may be a stupid question but I'm missing something fundamental about energy conservation of electrical machines - I am sure I have forgotten something from basic machine theory but I haven't ...
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104 views

Severe ringing when using high-level gate driver (HIP4081)

I am working on a project using the HIP4081 full bridge driver. I prototyped the working circuit on a breadboard experiencing heavy ringing on the gates of the high side MOSFETs (the ringing also ...
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78 views

H-bridge produces square wave output under heavy inductive load instead of sine wave

I was Following this tutorial to make H-Bridge. I have first did some simulation and the following image shows the same. I don't have schematic because I directly made the circuit by hand based of ...
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73 views

Using h-bridge with LED fairy lights

I have a string of LED fairy lights (5v) that when I connect to power, only half of them light up. If I reverse the polarity, the other half light up. It’s my understanding that I need a h-bridge to ...
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45 views

BJT h-bridge shoot-through problem

I made an H-bridge using this schematic: Although the circuit mostly works fine, there is noticeable shoot-through.Even with no load at 150-200hz the input voltage drops by a lot.I added dead time of ...
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37 views

H-Bridge simple performance

I design a simple H bridge. The bridge is controlled by a PWM signal with a frequency of 125kHz. The load is the LC resonance circuit. The maximum current is about 3A. Everything is powered by a Li-...
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182 views

Killed two Teensy 4.0s with this circuit - looking for help diagnosing

I have created a circuit for my Senior Design project at my uni. This circuit is meant to receive a signal from a contact microphone attached to a brass instrument, pre-amplify it, and analyze to find ...
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1answer
48 views

Schottky diode for MOSFET H-bridge

how can I calculate the value of the schottky diode? I use 4 MOSFET N-channel IRF1404 instead of IRF510 in the schematic The motor should withstand currents up to 100 A and 12v
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53 views

Weird output voltage from smps

I just completed a half bridge smps and had a test run. The series bulb on input just blink for a second at first and then shut down at it should. But the output voltage is quite weird because my ...
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37 views

Problem with H-bridge driving a small motor

I am asking this question because I am literally out of ideas with what might be wrong with my small circuit. It's essentially a 2-channel bipolar H-bridge, that drives two small motors. H-brige: ...
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60 views

How can I control an electric train?

I want to control electronic train, using an H-bridge and a voltage divider to detect if there is a train or not. (Whether the motor is connected to the wires or not.) When the yellow wire is "+&...
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39 views

H Bridge Gate Driver Current Sensing

I want to build my own 120A Electronic Speed Controller and decided to try it with the DRV8305 IC. I am by no means a hardware expert, so go easy on me. On page 45 of the DRV8305 datasheet: https://...
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51 views

Validation of my sinwave converter circuit

I'm pretty green and wonder if I can get my 555 oscillator, H-bridge, low pass LC filter validated. I am afraid it can be very painful making mistakes with such voltages. I plan to use FDA59N30 ...
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2answers
70 views

Is it possible to use a MAX232 to convert 0 to 5V PWM to 0 to 12V PWM to input to a motor driver requiring 0 to 12V PWM logic?

I'd like to drive a 16kHz PWM signal at 0.5mA into the input of a motor driver expecting logic levels of 0V for LOW and 12V for HIGH, and expecting a PWM signal around this frequency. The PWM signal ...
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85 views

yet another burned MOSFET issue in H-bridges

I'm trying to get into how H-bridges could be utilised in a heating/cooling peltier module for a personal fun project; I designed the circuitry (shown below), which BTW your feedback and suggestions ...
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36 views

Why are the high-side and low-side outputs on this motor driver IC separate?

I'm trying to understand the datasheet for the VNH5050A motor driver. The pinout shows the high-side source (SOURCE HSx) and the low side drain (DRAIN LSx): but after that the datasheet refers to the ...
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40 views

MOSFET drain-source voltage in an H-bridge

I'm using an H-bridge to drive a DC motor. The H-bridge is driven by sign-magnitude method (i.e. one of half bridges is not switching.) I did the best I could but I couldn't figure out what's ...
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58 views

Identifying the cause of defects in an H-Bridge by damaged transistors

I am preparing a fishbone diagram for reactive maintenance to be used as evaluative approach and part of it is brainstorming possible causes to get contributing factors. Consider the following H-...
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51 views

Op-Amp current sense in H-Bridge

this is my first attempt ever at building an H bridge for brushed DC motors. The board is controlled externally with an Arduino that sends the EN and PWM signals. I also need to measure the motor ...
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55 views

MOSFET gate inrush current

I am trying to use FDMQ8403 IC which has 4 nmos. It will be used for an h-bridge, so 2 of these will be for high side and 2 for low side. I am trying to drive the hide side nmos with MIC5018. On page ...
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116 views

H-Brdige MOSFETs getting hot despite no load

I'm building a 600v H-Bridge using IPZA60R060 MOSFETs together with isolated gate drivers UCC21520. I designed the PCB layout to be as tight as possible and thought I'd done a good job routing the ...
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60 views

1.7 MHz Full bridge driver circuit for mist maker validation

I'm building an ultrasonic mist maker that can support 10 ceramic discs with a resonant frequency of 1.7MHz. I found the following circuit online, unfortunately, I'm a beginner in circuit design and ...
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1answer
74 views

High side MOSFET extremely hot in a half bridge circuit

The high side MOSFET becomes extremely hot when I try to run the half bridge, and the output does not seem right. The PWM signals to Hin and Lin come from an Arduino - 47.5% duty cycle, dead time of ...
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1answer
63 views

DC motor voltage drop and high current draw

I'm quite confident the wiring of my motor-motor controller-Arduino setup is correct. I'm using an L28N H-Bridge motor controller and tested the output voltages to be correct (with 12V input). However,...
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75 views

DRV8871 (DC-Motor Driver) extremely reduced output voltage

I am working on a PCB which contains a PCA9685 PWM Driver and four DRV8871 motor drivers. The basic idea of the board is the PCA is controlled by a micro via I2C which then creates a PWM signal sent ...
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97 views

Mosfets burning in H-Bridge

I'm having a problem with a H-bridge, that drives a motor. Schematic This is the schematic for the H-bridge. Signals H[4:1] are generated by a microcontroller. mX and mY are the outputs for a DC ...
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28 views

Simple rectifier, solar to 18v ac

Would it be possible to charge a Ring video door bell from solar power, but using the doorbells external pins for the wiring of a 8 to 24v ac transformer. Say using a 12v solar panel, would regulation ...
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38 views

Manual overriding a DC-motor with H-bridge

I have created the following circuit where I use a VNH7070BASTR full bridge motor driver to control a DC-motor. The goal is to open and close a drawer using a rack and pinion system. A new requirement ...
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29 views

Replacement for obselete Infineon TLE52062GAUMA1 device?

I have an existing system that I wish to replace one of these Infineon TLE52062GAUMA1 motor drivers in. It's a H-bridge 40V/5A driver in a TO263 package. (https://ie.farnell.com/infineon/...
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55 views

12VDC Worm Gear motor suddenly stopped working now no current goes through it

I have 12VDC worm gear motor that i was setting up for a project. I have it connected to a store bought H-Bridge module and that is hooked up to a 12VDC power supply. I was working coding up a GUI for ...
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38 views

Weird H Bridge measurements: BJTs of Mosfets?

I'm trying to use the H bridge on the main board of a robot whose microcontroller I removed. It is connected to a small motor and contains 4 SMDs named ...
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1answer
73 views

2 Relay H bridge design

I am wanting to design an H bridge to control a linear actuator. 12vdc motor, max current 3.2A under load, and has built-in travel limit switches (ie motor stops at full extension and retraction). ...
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2answers
65 views

diagnosing transistor failure in H bridge

I built the H bridge shown in the schematic below for use with an unknown motor I pulled off of a broken CD player. I was seeing how hard I could drive the motor using large values for Vcc, and ...
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39 views

What switching speed limitations will this H-bridge circuit have?

I would like to use an H-bridge to switch higher voltages (between 5v and 48v using an adjustable linear regulator as the input voltage to the circuit VCC below) on a small piezo electric buzzer (...
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43 views

Why can't I drive more than one H-Bridge unless all other output pins are in Hi-Z state?

I've looked at other questions, this one came the closest, but my problem is not in terms of power supply. To drive multiple DC motors from an Arduino Mega 2560, I got a few HG7881-based dual H-bridge ...
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1answer
153 views

First schematics, DC-DC Converter question

I've made my first PCB design and I am unsure about a few things. This is a H-Bridge with a Attiny85. The Attiny85 will read a analog input on PB4 and adjust the PWM based on that. It is powered by a ...
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39 views

Blackout Protection for H Bridge with Synchronous Rectification

I'm designing an H-bridge motor controller with synchronous rectification similar to the Ti Stellaris RDK-BDC24 link here. Synchronous rectification has the promise of handling the back-emf from a ...
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2answers
124 views

How does this modified H-bridge circuit work?

I am trying to design a circuit which will have as an input a single microcontroller pulse which will cause a circuit with two 555 timers to output two consecutive pulses which are able to have their ...
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1answer
36 views

Why these resistors on the Pololu MC33926 carrier?

I'm trying to design a motor driver carrier for the DRV8873 chip, and I've been looking at Pololu's motor driver carriers as reference material. I noticed that they have inserted 1k resistors on all ...

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