Questions tagged [h-bridge]

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

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LTspice bootstrap half-bridge simulation peak current problem

I was working with the simulation I attach below. While testing my simulation I was confused when I observed a short circuit on the half bridge, and it did not get better when I added extra deadtime ...
MSB's user avatar
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Why is the load supply (VBB1) on my A3967 shorting to both OUT1A and OUT1B when the stepper motor is disconnected?

I am utilizing the A3967 Allegro microstepping driver with translator. The problem is that I'm burning out the driver when the stepper motor is seemingly disconnected. This doesn't happen every time I ...
CADcoder's user avatar
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Current Limiting Circuit with Comparator/ Threshold Comparator (current limit) switch Simulation

I am driving a stepper motor with an H-bridge and hex inverter and need to create a circuit that limits the current. I need help designing a circuit with a comparator that detects a current greater ...
Jay's user avatar
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Piezo buzzer testing for defects using electrical parameters

I am looking for methods to verify whether a Piezo is damaged/defective or good. Are there ways to verify that using just electrical parameters like resistance, capacitance etc. My issue is that it's ...
Anurag Kumar's user avatar
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208 views

Class-D amplifier output rings when connected to LC filter

I made a class-D amplifier with an output transformer, as you can see in the simplified schematic. Gate resistors are actually 10 Ω, not 2.2 Ω. The supply is 24 V, the PWM signal has a frequency of ...
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H-bridge 12V DC to 12VAC squarewave output

I am trying to convert DC to AC, in this case, 12VDC to 12VAC at 50Hz. I am using MSP430G2553 TI microcontroller to create Mosfet gate pulse. Mosfet model is IRFZ44N. The load is a 200 ohm resistor. A ...
Nabs's user avatar
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Half h-bridge circuit with LED and multiple buttons

The logic is basically that when I click the SW1, it should light up D5 and run Q2 and Q4. If I then clicked SW2, D5 would run but should run Q3 and Q1. Additionally, D6 should lit up when neither is ...
Kuya-carlo's user avatar
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High voltage (165V) H-bridge design

I'm trying to design an H-bridge circuit for 165 volts and am having some trouble. The motor I'm driving is actually an AC motor, which is why I'll be switching the signals 60 times per second, with ...
kees jansen's user avatar
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Using BTN8962TA to implement 3 phase synchronous rectifier

I want to use three BTN8962TA (datasheet) to implement a 3 phase synchronous rectifier. The input will be a BLCD motor used as a generator. The current at each phase will be measured with external ...
MarcoM's user avatar
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Poor efficiency of an H-bridge

I am simulating an H-bridge/class-D amplifier based on four GaN transistors with integrated gate drivers (NV6113 from Navitas). I am driving the gates via PWM signals where the PWM frequency is about ...
Charly's user avatar
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Operation of an H-bridge with complementary transistors

I am trying to understand the operation of this H-bridge but one thing is not clear to me and I didn't find good explanations on the internet. When transistor Q5 is activated, how does it activate Q1 ...
Lucio Mazzini's user avatar
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Generating a 60 Hz square wave to control a thin-film polarizing film with decent efficiency

I recently was tasked with researching and designing a power circuit that takes in 24 VDC (from a 300 Watt PS off mains (120 VAC sine)) and outputs a minimum of 400 mA at 100 VAC, 60 Hz square wave. ...
Steven's user avatar
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Inconsistent resistance measurement in H-bridge

I have an H-bridge circuit that is meant to measure the voltage across the shunt (330 resistor) and load (pictured as 4700, but variable) to calculate the resistance of the load (I have added the 10k ...
TTSB's user avatar
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Wireless charger reverse engineering

I am trying to figure out how to design an H-bridge for a wireless charger. And I thought that reverse engineering an off-the-shelf one might give me some clues. I might have made numerous mistakes ...
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What is the best way to turn off power to motor controller's H-bridge?

I am trying to figure out the best way to implement an emergency shutoff for the H-bridge of a motor controller: My requirement is to turn off the 48V to the drain of the FET based off a signal which ...
Afam Nwokolo's user avatar
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Speaker draws way more peak current than RMS calculations would imply, how do I deal with that?

So, for a project I'm working on, I'm trying to drive a small-ish speaker (Visaton SL87XA, 4 ohm version) using a FET H-bridge driven rail-to-rail from a RE46C100 horn driver chip in what's ...
ThreePhaseEel's user avatar
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Determining the voltage applied to a motor from an H-Bridge

I have to replace some old (no longer manufactured) H-Bridges with new ones that are preferably the same form factor. I'm trying to understand the datasheets, but I don't see where it states the ...
Rydberg's user avatar
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H-Bridge Class D Amplifier with transformer

I'm working on a H bridge amplifier capable to deliver 200 W into a 50 ohm load. Supply is limited to 24/28 V, unipolar. So I need a transformer in the output. You don't see a filter because I only ...
mtx4's user avatar
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H-bridge -- Driver for bootstrapping High-side N-MOSFETS

I'm working on a design of an h-bridge for a student organization. Current Design Problem Controlling the N-Mosfets is simple -- supplying 5V to "on" and 0V to "off". However, in ...
Aditya Matam's user avatar
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How do I integrate this MOSFET NOR logic gate with my circuit?

I have got an H bridge circuit controlled by a bridge driver (not in the schematic here). I want to control the disabling of it cutting of the conection to ground. I need the logic of a NOR gate but I ...
Developing Electronics's user avatar
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Thevenin impedance problem

I've tried to find the Thevenin impedance of this configuration but I keep getting wrong answers. My idea was to look at it as a double delta configuration, convert the upper delta to on y and carry ...
Vladnerovski's user avatar
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No current through the motor when using opto couplers to drive the mosfets in the H-bridge

I'm using opto-couplers 4N35 as a driver for an H-bridge. But there seems to be no current flowing through and the voltage is all over the place. The PWM is 3.3 V, 5 kHz (The circuit diagram has it as ...
TROY21's user avatar
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Challenges in measuring the output voltage of an H-bridge using an instrumentation amp and resistive divider

Design a circuit that allows me to measure the output voltage of a full H-bridge. Essentially, I'm using a resistive divider for this purpose. The simplified design is as follows: I had issues with ...
WalterPH's user avatar
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4 mosfets inverter circuit low output voltage problem

I have used the mosfets as a switch to generate a simple square wave at the output. Taking the concept from the simple switches if there were switches instead of the mosfets as shown below then we ...
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How can I add an enable signal to a 3-Phase H-Bridge?

How can I add a signal to turn off or disable a 3-Phase H-Bridge? I have thought about adding a P-channel MOSFET controlled by a signal called Enable to open the voltage source of the bridge or a N-...
Developing Electronics's user avatar
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Coil resistance and input current in stepper motor H-bridge

Vcc: type: charger Current: 2.5 A Voltage: 12 V Stepper motor: Model: JK42HS40-1704 Coil resistance: 1.65 Ω Coil current: 1.7 A When choosing resistor R1.1 and R1....
Jakub Kutrzeba's user avatar
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How to make latching valve turn to close orientation when power fail when controlling it with H bridge of MOSFETs?

I am making a circuit which controls a latching valve this valve is going to be controlled with 2 pins from my MCU. The valve must turn to the close orientation when power fails either from battery or ...
Alji2124's user avatar
2 votes
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426 views

Braking vs. Coasting During The PWM Off State Of A H-Bridge

Let's pretend we have a standard 4 MOSFET H-bridge that controls a 12V brushed DC motor. When driving the motor forward, we can keep SW4 on continuously and pulse SW1 on and off (see below image). If ...
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select the proper HALF-BRIDGE DRIVER for DC motor application

I was looking for a HALF-BRIDGE DRIVER for my H-bridge and BLDC motor projects, however, I found most of the MOSFET gate drivers are two types One has SD (Logic input for shutdown) and IN (Logic input ...
Hamid s k's user avatar
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IGBT H-Bridge Inverter

I am busy trying to repair a IGBT H-Bridge inverter that forms part of an AC spot welder. The problem I am having is that it works perfectly with a resistive load, but when I connect the step down ...
Marius Botha's user avatar
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How should I configure the TRQ pin on the DRV8847 Dual H-Bridge motor driver for Independent Bridge Interface mode?

I'm looking into motor drivers for a design update and I'm leaning towards using the DRV8847PWPR. If I go with it, I intend to configure it for an Independent Bridge Interface (shown in section 7.3.34 ...
E.HP.S's user avatar
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Reverse engineering my robot vacuum

I am reverse engineering my Dirt Devil M612 Spider 2.0 vacuum cleaner as a hobby project, such that later on, I can use a micro-controller to run it myself. I was looking into how the motors were ...
Mart's user avatar
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Why do buffers decrease delay?

Lots of people break up wires into stages to decrease RC delay. This makes sense to reduce the wire L and thus capacitance, but doesn’t the time for the signals to propagate through the buffers add ...
Devon Cantrell's user avatar
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1 answer
141 views

Circuit to measure back EMF around an H bridge

I want to design a circuit with an H-bridge to control a brushed DC motor. In order to control its speed, I want to measure the back-EMF of the motor and make a PID control loop in software. I do not ...
bask185's user avatar
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How can I controll the speed of a coreless motor with an RC receiver?

We used a brushed ESC 1A 5V (0.4g) DSM-ESC001 (unable to find its manual) for controlling a coreless 614 motor with 8mA no-load rating with an FS-X6B receiver. After checking some things out, the ESC ...
Ijaz Ahmed's user avatar
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How to interface an isolated microcontroller to an integrated h-bridge?

I have an ESP32S3 microcontroller powered by an isolated DC-DC converter and I would like to use this integrated h-bridge to control a DC motor. The power supply can be either 12 or 24V. My gut ...
Coconha's user avatar
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MC33883 how many transistors can be connected on the high/low side and what PWM frequency to use?

I am developing a 24 V 25 A DC-motor driver, using the MC33883 driver and WMK060N10HGS transistors, 4 pieces per side, and powerful Schottky’s diodes to suppress EMF. There is a working prototype. ...
Mastech's user avatar
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How to calculate the DeadBand time for H-bridge in Cycles

I am using L298n H-bridge driver and using Texas Instruments tiva c tm4c123gh6pm microcontroller. According to the datasheet (I am using source rise and fall delay because according to my ...
Ahsan's user avatar
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LTspice simulation of a fluxgate excitation circuit with H bridge driver, Op-Amp and comparator not behaving as expected

Please see the following LTspice schematic: This is an excitation circuit for a fluxgate current sensor. The inductor L1 models the magnetic core's B-H loop and dimension along with a sensing winding ...
Zhi's user avatar
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Is it possible to simplify this H_bridge circuit to only 4 transistors?

I would like to control a simple DC 0.4A/6V motor with both directions. I use a simple circuit that generates a rectangular signal with equal duty cycle to control the directions of the motor. I used ...
Jerzy Przezdziecki's user avatar
1 vote
4 answers
625 views

How to drive high and low side FET with 3.3V microcontroller?

This picture describes the current state of my project that I am working on. I am making a half-bridge high-current motor driver (that will eventually evolve into a full-bridge). The motor is ...
theph's user avatar
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5 votes
1 answer
451 views

Understanding PWM regenerative braking

I feel like I'm on the verge of finally wrapping my head around half-bridge PWM DC-motor driving/regenerative braking. I will show 3 circuits and explain what I've understood about each of them ...
Solmyr999's user avatar
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A bit of confusion with DRV8210DRLR motor driver

I am working with DRV8210DRLR motor driver, mouser says it is a half bridge controller, texas instruments that it is a H-bridge. I require to spin motor and be able to change direction, so I assume I ...
Dominykas's user avatar
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3 votes
0 answers
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PID H-bridge random current spikes

My H-bridge consists of 4 n-channel MOSFETs. The high side is driven by a basic bootstrap circuit, and the low side is directly driven from the MCU. Using a PID function to control the motor by its ...
Ralfs Volis's user avatar
1 vote
1 answer
64 views

What might happen if load and supply are reversed in an H-bridge?

I have an H-bridge motor driver board. The Vcc & GND of the same is also connected to a microcontroller, MOSFET driver and, other electronics. The power supply to the motor driver board has an ...
WhiteShark's user avatar
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"High" current MUXing of 4 HD LRA (AC voice coil) haptic motors

First off, thanks in advance for reading and for any ideas. Please forgive my ignorance on certain things; I'm a new industrial designer with some electronics experience, although I'm not an ...
Michael.G's user avatar
3 votes
1 answer
699 views

TMC5160 stepper drivers don't enable the motor, "open load" bits set, driver error

I made a 6-layer board with an ESP32-S3 and two TMC5160 stepper drivers, with external H-bridge MOSFETs (WSD4098DN56 from Winsok). I copied the schematic of common "StepStick" TMC5160 boards ...
marcocipriani01's user avatar
2 votes
3 answers
136 views

Bulk capacitor sizing to protect H bridge during motional EMF

I'd like to drive a 30 V motor with this H bridge driver and an Arduino. The problem is that on top of working in forward motoring and reverse motoring conditions, it will also work in forward braking ...
Guillaume D's user avatar
9 votes
2 answers
592 views

Why is the P-channel MOSFET in my H-bridge burning?

In this circuit I designed, I use a TC4427 as driver and a dual package FDS8858CZ as MOSFET. I'm feeding the driver 12 V and the MOSFETs 18 V. I am using the C9, D3, and C10 and D4 components you see ...
Archura's user avatar
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MOSFET H-bridge

But I'm trying to build robust controller to reverse a motor in a harsh environment. The motor has built-in limit switches, which stop it from running-on at the end of it's stroke, which is fine for ...
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