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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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BLDC DR8305 design 42A

I'm trying to design my own PCB to control 4 x 300W three-phase motors with the DRV8305 BLDC and an STM32F401, but I have a problem with the number of PWMs available. To solve the problem of the ...
Paulo971's user avatar
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1 answer
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H-bridge motor braking via NC button

New guy here. I'm doing some work for an engineering professor; he wants me to implement stop/braking capability on the robot we are working on. The platform used is a Pioneer 3-DX, with two motors ...
Flubberknuckle's user avatar
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Designing a 4 H-bridge PCB board using a DRV8871

I want to make a 4 H-bridge PCB that consists of 4 DRV8871. I have seen the schematic that Adafruit has posted for their design and looks suitable for my case. So my idea was to repeat their module 4 ...
Alji2124's user avatar
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H-Bridge with inductive load default state

I am developing a circuit for controlling solenoid valves and i am using H-Bridges (composed of PMOS and NMOS transistors). My question is whether it is important, when the H-Bridge is in its default ...
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One of two DRV8870 has voltage dip when load is connected

I have this prototype board design with 2 DRV8870DDA chips. One of them is working, the other is not. There are 3 differences, the not working one has a V+ of 18V, the working one uses +12V. Both are ...
bas knippels's user avatar
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Development of H-bridge on bipolar transistors

I want to design a low power H-bridge on bipolar transistors. I've already made one, built the board and tested it. Generally works, but there are difficulties with control and sometimes I have a ...
Rodney's user avatar
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Reverse Diode on MOSFET Gate Drive Resistor

I am trying to create a H-Bridge to power a TEC. Each of the half bridges can be used as a synchronous buck converter, while the other side is grounded. The frequency and duty cycle are controlled ...
Fried Electronics's user avatar
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How to troubleshoot an H-bridge motor driver circuit? [closed]

I am running into a problem with my custom motordriver. It was designed to control two small 3-phase sensorless brushless motors powered by a 3S battery. It is based on an STM evaluation board (...
Luuk Benningshof's user avatar
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Best way to generate a variable clean DC current

On one end I have an amArduino or other microcontroller. On the other end I have a small electromagnet coil with about 20 turns of 1 inch diameter. I need to drive this coil with some precision (say 5-...
user1402154's user avatar
2 votes
2 answers
182 views

H-bridge with two logic-level GPIOs drawing high current

I am working on controlling a bi-stable latching solenoid with an H-bridge. The microcontroller that I am using for my project doesn't have enough GPIOs for me to use four pins for the H-bridge, so I ...
sdolan's user avatar
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Review my power MOSFET motor control circuit - rev5

Software engineer dabbling in electronics here. With feedback from the previous iterations, I think I have something I can put on a breadboard without putting silicon particulate matter into the air. ...
cmc's user avatar
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Discrete components motor driver or integrated solution

Is there any reason for someone to implement a stepper (or DC) motor driving circuit with discrete components such as ZXMHC3F381N8 and external MOSFETs, resistors, snubber circuits, flyback diodes etc....
irag10's user avatar
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Review my power MOSFET motor control circuit - rev4

Software engineer dabbling in electronics. Based on previous feedback, here's a simplified discrete motor controller including part details. This is an H-bridge with IRF9Z34N N-channel mosfets Q3 and ...
cmc's user avatar
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Review my power MOSFET motor control circuit - rev3

Software engineer dabbling in electronics. Based on previous feedback, here's my latest revision of a simple fully discrete motor driver. MCU is a raspberry pi with GND output pins O1 and O2. Q1 and ...
cmc's user avatar
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Arduino Bi-stable solenoid valve

I'm making a bi-stable solenoid valve with the help of an Arduino and a motor controller module (MX1508/MX1616). I saw many instructions about motor controller with PWM speed etc, but didn't see any ...
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Use a pair of half-bridge drivers to make a full-bridge driver

I intend to use a pair of half-bridge drivers and a logic gate to make a full-bridge driver for controlling my DC motors with 3 standard input pins of Enable, Direction, and Arduino PWM. I looked at a ...
hrsk2002's user avatar
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How to Design an Efficient H Bridge using MOSFET for DC Motor (12 V)?

I would like to ask what is the most efficient H-Bridge design using MOSFETs (IRF9540N and IRF9540N). I found many references in this forum like using and I am still confused to decide. My goal is to ...
SKevinAR18's user avatar
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Controlling logic gate and dead time for H-bridge MOSFETs

I intend to make an H-bridge driver for a 36v DC motor that can control with 3 MCU pins (Enable, PWM, Direction), Regarding my research, there are three options to drive the H MOSFETs; One using the ...
Hamid s k's user avatar
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L298 H-bridge: there is voltage, but it disappears once motor is connected

I'm trying to drive a DC motor in different directions with the help of L298 H-bridge (multiwatt vertical package) and an Arduino. I can measure how voltage changes from -5V to +5V, give or take, ...
olegst's user avatar
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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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2 votes
1 answer
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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
2 votes
2 answers
275 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 ...
mtx4's user avatar
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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
1 vote
1 answer
151 views

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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29 views

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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1 answer
119 views

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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1 vote
1 answer
99 views

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 ...
shklj's user avatar
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1 answer
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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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2 answers
120 views

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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1 answer
195 views

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
1 vote
1 answer
113 views

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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1 answer
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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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1 vote
3 answers
302 views

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 ...
kam1212's user avatar
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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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35 views

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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1 answer
43 views

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
2 answers
811 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 ...
gbmhunter's user avatar
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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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2 answers
539 views

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
1 vote
0 answers
50 views

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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