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

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45 views

How to Run 12v 1A Electromagnet From Arduino (3v) Without External Power Supply

I have a project that I am working on that uses a micro controller to control an electromagnet that I want to run with a 3.7 volt battery. I would like to reverse the polarization on the electromagnet ...
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1answer
28 views

High Power H-Bridge with IR2125 Drivers Problem

I'm currently stuck on a problem when trying to drive a 140V DC motor using an H-Bridge with 4 high-power mosfets and 4 IR2125 drivers. I'm using as input to the drivers a signal generator of 5V in ...
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18 views

How to choose a single H-Bridge IC?

They all seem to pretty much offer the same features. On what basis am I supposed to compare single H-bridge IC's for a typical application of driving a smaller (<1A max) brushed DC motor, similar ...
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14 views

Bipolar stepper motor sequence, wiring and dual h bridge

Im facing some issues to figure out sequence of my bipolar(specifically) and unipolar stepper motor. However , I've managed to get Dual H Bridge but couldn't find out the example/documentation for the ...
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1answer
75 views

Over heating H-bridge MOSFET (irf9540)? [closed]

I have done the circuit in the picture : from here (modified Question): So two LEFT MOSFET (IRF9540 & IRF540) will be overcharged and so heating and DC motor speed is Constance and don't ...
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80 views

Latching solenoid control

I am working on a personal project that will involve driving a latching 9V/DC solenoid from an arduino. The circuit I've come up with is dependent on two things, that I haven't quite figured out yet: ...
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35 views

Driving high voltage MOSFET H-bridge

I am looking for suggestions on MOSFET transistors and logic for driving high voltage full H-bridge from a 5V PWM signal. I have a microcontroller that outputs a PWM signal 0V->5V. And with this ...
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149 views

Is my MOSFET H-bridge design correct?

Can anyone check over this motor controller design I made? I'm running off of a rudimentary understanding of electronics (just a hobbyist), so I'm not fully confident in it yet. Kamil EDIT: ...
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28 views

Torque control with H-Bridge via direction pin

Using the LMD18200 (H-Bridge) and the LM3524D (PWM regulator) I should design a torque regulation. I've found a circuit in the LMD18200 datasheet which uses the current feedback to adjust the PWM. ...
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55 views

Equivalent of IR2155

I build a circuit based on IR2155, but it's not so readily available in my area. Is there an equivalent IC for IR2155?
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66 views

Anti-Parallel Diodes and H-Bridge

Does the anti-parallel diode forward voltage in a single phase inverter need to be lower than the body diode of the MOSFET? I have MOSFETs with a forward voltage of 1.2 Volts, and SiC diodes with a ...
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58 views

Using two half bridge drivers as a full H bridge

I'm trying to design a motor (brushed DC) speed controller circuit (to learn about such circuits). I decided to use two half bridge drivers (IR2184) to control my bridge. The circuit I've come up ...
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92 views

Will these heatsinks be sufficient for my mosfets?

I need to control 10 12VDC motors at ~25Amps, so I decided to make my own mosfet H bridges to control it ( with 2 n chan et 2 p chan ). I will need 10 H-Bridge, so 40 Mosfets. ( 20 n chan and 20 p ...
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51 views

change polarity of Solenoid

I am working on a project which includes a couple of Solenoids (Link to the used Solenoid: ...
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70 views

Relay voltage drop, a solution?

I simulated an H bridge with 2 relays and one motor in PROTEUS. Everything is 12 V and DC, I set relay coil resistance at 80 ohm ( I am replicating this : ...
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1answer
106 views

Bipolar stepper motor (Alfa Romeo 156 speedo) w/ L293D

I would like to use my Alfa Romeo speedo in my simrig, I have got the cluster pinout and the speed signal is coming from the ABS (Just like any other car, my BMW cluster works like charm). The only ...
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2answers
83 views

Basic h-bridge motor driver circuit for audio PWM waves with possible negative voltage

I need to control a DC motor with the PWM audio waves coming out of the audio jack of a device. The device will send a positive PWM to drive the motor forward and a negative PWM signal for driving it ...
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69 views

No output at H bridge during quick power drop

I used a H bridge with PMW control to drive DC motor in two directions. I observed a strange phenomenon that during quick voltage drop, the PWM output at M2 is cutoff, although the T4 gate PWM input ...
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1answer
68 views

H-Bridge with Darlington BJTs, static shoot-through

I have built the following H-Bridge with TIP122 and TIP127 Darlington BJTs: It is made from parts I had around, and I plan to use it for currents up to 2A with a VCC of 12V. Note that 1N4937 ...
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56 views

Commanding numerous motors with one H-Bridge

Is it possible to command more than one motor with an H-bridge like this: Would this work in real life if I replace switches with transistors and command them?
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70 views

External power supply necessary to run two stepper motors from a RPi?

I am following this tutorial for a CNC laser engraver. I have two stepper motors from some old DVD drives and two L9110S H-bridges to control them. I am now working on putting it all together and ran ...
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1answer
190 views

MOSFET based H-Bridge Circuit

Okay really need help on constructing a MOSFET based H-bridge circuit with a switch. I've got two p type and two n type mosfets. I understand you have to apply voltage to the gates to turn the ...
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1answer
139 views

Commanding a 12V DC motor with high power (~20A)

I'd like to control a 12V DC motor but it has very high power, around 20A. I was looking for H-bridges but they all support only low power (around 1A) Do I have to build my own H-bridge with high ...
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65 views

Using an H-Bridge like a comparator

I'm wondering if there's a way to use an H-bridge like a comparator- That is, if one input is greater voltage than the other, then the attached motor spins one way, and vice versa, and it doesn't spin ...
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34 views

School Task with NTC

I need to solve the task shown on the picture. The first part is to calculate the temperature (in °C) from the NTC when Uv = 2V is. This means Iv is infinite. The given Values are: Uq = 12V, R1 = ...
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139 views

How to build an H-bridge using MOSFETs? [duplicate]

I want to reverse the polarity of my current source, which is a capacitor in this case, in the middle of discharging phase. Also the capacitor bank is being discharged through a coil to make a short ...
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134 views

Do AC inverter H bridges ever get driven this way?

There's a google competition going on at the moment called the little box challenge. It's to design a very efficient AC inverter. Basically the inverter is fed a DC voltage of a few hundred volts and ...
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41 views

Does a modified “continuous rotation” servo typically create an H-bridge motor controller?

A common technique for driving small hobbyist robots is to make a "continuous rotation" servo by replacing the feedback potentiometer with two resistors of equal value. Does this modification ...
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1answer
92 views

Why can't we command two DC motors with just 2 relays for each in opposite directions with a same power supply? [closed]

We managed to control 2 DC motors with 2 relays for each one.It worked great except one thing: we couldn't make them turn in opposite directions at the same time .We noticed that there was a shot ...
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1answer
134 views

MOSFET H-bridge design

given the circuit below to be used as a H-bridge with AVR PWM. Is this a good desing to use? What can you recommend? I already built something like this but without the resistors. ( and so burned ...
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1answer
59 views

L298N Module Out 1 and Out 2 failure

I have an L298N motor controller module, rated at 5 amps. I'm using it to control two 12 volts linear actuators, and I'm using a current sensor per motor to learn when the motors have reached a high ...
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2answers
123 views

Eliminate PWM noise in PWM-driven bidirectional motor

I need to drive a DC motor with PWM, through a H-bridge. The controller can't generate PWM at ultrasonic frequencies with resolution I desire, and the low-end of the spectrum (~100Hz) may be too slow ...
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154 views

H-Bridge Instant Death

I have a DRV8840 that I am trying to use. I have burned up about 10 of them trying to get it working. For this application, I need the H-Bridge to Current Limit and Brake the motor. Max current ...
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63 views

Will this H-Bridge and it's driver work?

I am creating a half bridge, I though about it a bit and came up with this idea First for the controlling side we have a typical 555 timer wired up like this (But the resistors are variable ...
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123 views

H-bridge/buck converter with negative and positive voltage range

as already questioned here, i am still working on peltier controllers. For that I am using a stepper motor driver (h-bridge) with a low-pass LC filter and the peltier element behind, as Olin Lathrop ...
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3answers
206 views

Connecting diodes to a motor in H-bridge

I'm attempting to design a three wheeled toy that is controlled by a remote connected with it via a cable. I first designed it with relays, however I had to change to transistors due to contrast ...
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1answer
48 views

How to regen a DC motor from the high-side of a boost converter?

I am planning to drive a 24v motor from a 12v battery, using a DC-DC boost circuit to generate the 24v and an H-bridge to PWM drive the motor. A problem arises when the motor goes into the regen ...
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153 views

Bidirectional solid state switch for solenoid

I'm building a circuit to control a flip dot display, which is basically a matrix of solenoids which you control with bidirectional current across the 25 columns and 7 rows of the board. The ...
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2answers
363 views

Are peltier elements polarized?

I'm looking to add a peltier element to one of my projects. However, I want to sometimes heat and sometimes cool, depending on the ambient temperatures on both sides of the element. Image ...
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1answer
281 views

Why have my MOSFET drivers blown in this H-Bridge?

I've built a discrete H-Bridge circuit to run a reasonably beefy 12V windscreen wiper motor. The circuit is below (EDIT: see here for a bigger PDF, StackExchange doesn't seem to let you expand the ...
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1answer
84 views

H-bridge acting strange [closed]

I am making a robot with two coin batteries rated at 3V and using ATMega164 microcontroller. I am trying to run the motors in both directions for which I am using an h-bridge. I need it to be surface ...
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165 views

Why is a resistor put before the gate of a transistor?

In most of the H-bridge driver circuits I've come across so far, there's a resistor in the path of the signal to the gate/base of the mosfets/BJTs, like in the images below why is it put there ? ...
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319 views

Controlling a Stepper-Motor with 2 H-bridges

I think that I may have come up with a possible way to control a bipolar stepper motor using 2 simple H-bridges. The idea is to control the direction and the steps of the motor by switching the ...
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454 views

Severe ringing when high side MOSFET in half bridge circuit switches on

I have designed a PCB (intended as a prototyping building block) that has a IR2113 high and low side gate driver driving two IRF3205 (55V, 8mΩ, 110A) power MOSFETs in half-bridge configuration: ...
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2answers
119 views

Latching Relay Driving Idea

I need to drive a 9V latching relay with single cell lipo 3.7V battery. So I designed a boost convertor. It brings 3.7V to 9V and than drive the latching relay with H-Bridge. But with this design so ...
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50 views

What is meant constant voltage control of h-bridge

I am using LV8075LP as the h-bridge to drive small 3V, 90mA coin vibration motor. I came across a few terms that I need to understand. Constant voltage control Output full drive Also, can I use ...
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129 views

Using single microcontroller PWM output for 2 h-bridges

I am using ATMega16L and I'm using two DC motors to build an autonomous robot. I want to use an h-bridge to control the two motors. Can I use a single PWM output from say Timer1 on the microcontroller ...
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782 views

How does this H-bridge circuit work?

I am trying to repair an old radio-controlled toy car. It would only go backward, and forward movement would stutter. After some investigating, it turned out that one of the H-bridge NPN transistors ...
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3answers
239 views

Complementary H-Bridge Motor control

I have some concerns in a motor control board I designed. Sometimes the MOSFETs unexpectedly start to burn. I suspect one of the reasons is the thin track (0.2mm) I have in my flexible board (0.2mm), ...
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5answers
212 views

H-Bridge out of 2 (1 PNP, 1 NPN) Darlington Arrays

I need to control, with a µC, 4 single-coil latching relays and I am exploring various options. My first bet would be a H-Bridge. Since H-bridge ICs are quite expensive and are mostly designed to ...