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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Polarity switching circuit
I have a variable resistor as a load that want the current to remain constant by changing the voltage, This circuit also has polarity switching (like H-bridge). Each time the circuit is turned on, ...
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44 views
PWM driven MOSFET to power a coil
I need to power a coil (electromagnet to be precise) using a PWM singal generated by an arduino or a 555 timer.
I can esily power the coil when the PWM signal is in the HIGH (5v) state using a simple ...
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1answer
57 views
H-bridge made of MOSFETs
If we have an H-bridge made of 4 N-MOSFETs, the gate voltage applied to each pair must be different because in an active circuit the sources will have different voltages. How much?
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4answers
178 views
An inverter without a transformer?
I am trying to build an inverter without a transformer. I want to use a 12V battery connected to a boost converter which will boost the 12V to 120V, then simply attach an H-bridge to the 120V boost ...
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1answer
89 views
How can I decrease power losses of H-bridge with 4 N-channel MOSFETs?
This is my H-bridge circuit. I need to change the polarity and found this circuit from the site. I need 0-200 amperes for the load. I want to use the IRF1404 and parallel them, but I have two problems:...
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1answer
50 views
PNP and NPN H-Bridge - Drive PNP from opposite output
To drive the PNP transistors on an H-bridge circuit, the control voltage needs to be at least the input voltage, or a secondary stage is driving the high-side PNPs.
I have come across a circuit that ...
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1answer
50 views
Motor impedance too high at 20kHz
I have an H-bridge I am driving with an Arduino Mega. The motors I am driving are fairly large, steady state 48 watts, maximum 300 watts. I am driving them at 16 volts and a switching frequency to ...
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1answer
42 views
DC motor interfering with another
I have two H-Bridge drivers controlling two geared DC motors. These are the modules I am using : https://www.handsontec.com/dataspecs/module/BTS7960%20Motor%20Driver.pdf
I have two of the above ...
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41 views
How can i make the pulse at V2 shift by 180 degrees in order to make it a negative 7.2 symbol for H bridge motor
This is the circuit I built in Lt spice. The NMOSFETS I downloaded online have 1,2,3 automatically i cant change the label. 1= drain, 2 = gate, 3= source.
This is the result i get
However i need to ...
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50 views
Question on H bridge motor circuit
I just finished task 1 on my project but my teacher has not provided any good guidelines so I was just hoping if you guys could check my work before I move on to step 2 and let me know if I'm correct ...
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1answer
58 views
h bridge motor circuit on LT specie
I've been working on a project where i'm building a h bridge motor circuit i have easily spent 15 hours on it and have made extremely slow progress on it in the last 3 days. The project sheet is seen ...
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2answers
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Is the DC-Link capacitor (C1,C2) necessary in cascaded H-bridge to achieve more balance and reduce stress on switches?
What is the purpose of the dc-link capacitor?
(Cascaded H-Bridge topology is free from voltage balancing problem because it does not contain DC link capacitors. but Many papers discussed this issue in ...
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1answer
94 views
Can an H-bridge drive another bridge?
I'm using a low-frequency RFID IC that handles a bunch of the low-level signal decoding, but I'm hoping to get more range out of it. It has two TX pins (diagram below) that it describes as a "...
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1answer
92 views
NPN transistor turning on with grounded base
The NPN transistor in bottom left with grounded base is turning on in circuit simulator for some reason.
Can someone tell me why is this happening?
Circuit Simulation link
I know why the other 3 ...
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1answer
45 views
H bridge working with led but not with electric motor
Noob here. I am trying to make a car which i can control remotely from the internet (ie. lan). I have a H-bridge circuit which has all NPN transistors (bc 547B and datasheet here: https://www.farnell....
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1answer
65 views
Arduino compatible H bridge behaving unexpectedly
I have built an h bridge in a circuit simulator for controlling my brushed DC motor such that it can work with 5v supply from Arduino Uno here is its link to play around with the circuit Circuit ...
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1answer
33 views
H bridge with a single I/O control and NPN at the top
I want to control a 4V motor to rotate both directions which draws 100mA and I was looking at the H-bridge schematics. The tutorial says that you should place NPN transistors at the bottom if you need ...
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2answers
130 views
Suitable Half Bridge Driver to control capacitve load
I am looking for a method to reliably and quickly charge/discharge capacitors. Each capacitor should be individually charged/discharged. The charge/discharge rate should be in the microsecond range (...
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Arduino/RPI module to control LED fairy lights with reverse polarity
I cant find any module to control my garland of lights by any embedded device. This module should be powered by DC12V input (but also possible to use Step Up/Step Down DC-DC voltage converter). The ...
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60 views
How to select appropriate capacitor for an H-bridge
PROBLEM: Considering the figure below, I need to select an appropriate bank of capacitors for a 3 half-bridge brushless controller, which system have this characteristics:
VM = 60v (maximum);
Max ...
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0answers
22 views
Issue with H-Bridge simulation waveform
I've built a simple H-bridge circuit with LTSpice:
DirSigA (blue), DirSigB (red) and Vout (green) waveforms:
DirSig A and B are both pulse signals with a Vmax of 5v. I've been tinkering with the ...
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52 views
Unable to control 24 VDC brushed motor with dev boards
I'm designing a board that has to control several DC brushed motors. The motors are SY54E-DC24V-2PCE. I didn't find a datasheet but some references like this and this.
I measured the DC resistance of ...
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1answer
87 views
H Bridge problem [closed]
I have been banging my head on this puzzle for a few days now, need some help from the experts...
Here is the schematic of my first attempt at an H bridge for an RC car.
The motors ( two in parallel) ...
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2answers
66 views
H-Bridge power supply
I need to separately power the transist MOSFET with a higher voltage than maximum VDD of the driver MOSFET.
Is the diagram correct? Will the driver fully open the transistor?
TC4428 Datasheet
AOD603A ...
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52 views
How to combine H-bridge with high current pwm smoothing filter
I would like to drive a peltier (rated max 12V, 5A) with three considerations:
i want to control the voltage absolute value with a PWM signal from an arduino (30kHz),
the voltage across the peltier ...
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0answers
46 views
Can we use bootstrapping technique for resonant inverter?
I am developing a resonant converter and could not understand which technique is not be used for the H-Bridge inverter so the MOSFETs can switch properly. I am using IRF540n N-channel MOSFETs.
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How to analyze this MOSFET H-bridge circuit?
In my university electronics course project, I am asked to analyze an H-bridge circuit. It is a simple H-bridge in which the motor is represented with a 37 ohm resistor and thus has no diodes.
The ...
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1answer
23 views
Stop a Relay H-Bridge for Brushed DC-Motors to get burned
i am using two Relays to create an H-Bridge.
This H-Bridge drives a 24V Motor ~3A in both directions.
Now i often got the problem, when i turn on a motor and turn it off again, the relay contacts are ...
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1answer
58 views
Choosing Full Bridge Gate Driver
I want to use an H-Bridge module as a switch in a 12V DC circuit and would prefer, if possible, for ease and simplicity, to use a full-bridge gate driver such as the IRS2453DS. The H-Bridge comprises ...
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1answer
69 views
MOSFET Circuit To Alternate Polarity
I am trying to reverse engineer and understand the following circuit found in an LED lighting controller.
The OUTPUT is basically a 12V supply where the polarity can be selected by the MCU (Q7/Q2/Q1 N-...
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0answers
33 views
Controlling DC motor with H-Bridge motor driver and a relay
I am trying to build a smart car.
I have 4 DC motors with tires. They are yellow 3-6V hobby project motors. I have two L298 H-Bridge boards and 1 relay.
I connected two of motors to one H-Bridge and ...
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1answer
50 views
Using Dual [High Side/Low Side] Isolated Gate Drivers
When in general is it easier, even preferable, to use a dual isolated gate driver on an H-bridge with IGBT power transistors, rather than separate high side and low side drivers; what if any are the ...
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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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78 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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1answer
89 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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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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1answer
69 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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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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2answers
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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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1answer
74 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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0answers
58 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
30 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
98 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
120 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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1answer
159 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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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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1answer
106 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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0answers
66 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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1answer
39 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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2answers
238 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 ...
