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

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94 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 ...
0
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1answer
28 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 ...
1
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1answer
84 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 ...
2
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1answer
71 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 ...
1
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1answer
36 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 ...
2
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1answer
54 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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2answers
125 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 ...
0
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1answer
51 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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2answers
51 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
77 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 ...
0
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1answer
40 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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2answers
100 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 ...
3
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2answers
198 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 ...
5
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1answer
138 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 ...
1
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1answer
81 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 ...
0
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1answer
105 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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2answers
155 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 ...
8
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1answer
199 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
78 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 ...
0
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1answer
42 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 ...
0
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2answers
92 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 ...
4
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3answers
445 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
169 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
138 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 ...
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1answer
121 views

Using L293 H-Bridge to drive DC motor with PWM

I want to drive an DC motor with ability both to change direction, and torque. Obvious solution: PWM + H-Bridge. I've been planning to use a PSoC4 for controller, and L293DNE for the H-bridge, which ...
2
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1answer
112 views

Something better than an H-bridge to drive motor?

Is there something better than an H-bridge to drive two motors using the ATmega8 with a 7V power supply? My teacher said the H-bridge overheats and is bad. Is there a better solution? For instance: ...
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2answers
108 views

How can I design this pull up without wasting current/performance?

I want to move the low side enable switch of my H-bridge onto the high side, because for safety reasons it's better to turn off the tap than plug the drain. I'm powering a 24V, 35W BLDC, so it's ...
2
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1answer
213 views

Losses in MOSFET

Currently I am working on an H-Bridge. To drive the MOSFETs on the H-Bridge, I have used PWM signals (5V). Voltage supply at MOSFET is 12V. When I provide 5V PWM to the gate, the MOSFET heats up but ...
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1answer
99 views

L293D overheating

I have an old RC car. I removed all electronic from it, just left the plastic and the DC motors. It has 2 DC motors(1 for moving, 1 for left/right). I decided to attach arduino to it, while ...
3
votes
1answer
105 views

Why flyback diode is preferred over fwd body diode of MOSFET in case of H-Bridge?

Why flyback diode is preferred over fwd body diode of Mosfet in case of H-Bridge? Can fwd body diode of MOSFET can serve the purpose of flyback diode?
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2answers
51 views

Control 8V H-Bridge with microcontroller

Good afternoon. I've been trying to control an 8V H-Bridge (PMOS+NMOS) with a 4V microcontroller output signal. I thouth it would work but then i read that the PMOS source voltage had to be equal or ...
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1answer
88 views

Charge Arduino through Computer but connect to external circuit

I'll explain what I'm trying to achieve first. I basically want to control a 4 wheeled robot through an Arduino but I need the Arduino to get the commands from a computer. I've already setup the ...
0
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1answer
84 views

MOSFET for H-bridge

I need to power a load with 1.5V or -1.5V MCU controlled. The circuit is powered with 1.5V so for getting the negative voltage I'm going to use a H-bridge. simulate this circuit – ...
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1answer
120 views

L298 high side driver: how does this actually work?

I recently took another look at the L298 since some students were having problems (due to the commonly discussed high V_CE-on of the combined high side and low side drivers). One thing that struck me ...
0
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1answer
82 views

Difference between SOP and PSOP

I am trying to create a custom PSOP footprint in Altium designer using the IPC compliant footprint wizard. The datasheet of the ic says that it is a PSOP (plastic small outline package). In the wizard ...
3
votes
2answers
71 views

4 P-FET HBridge

The other day I got a reel of 800 P MOSFETs, my workplace threw out, as the entire company is relocating. 800 are quite some, and I need to build me a couple of HBridges anyway, so "joy, oh joy!" ...
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2answers
74 views

Weird Behaviour with Bootstrapping Circuit

I'm trying to make a 3 phase BLDC driver and picked up some FAN7888s since they're inexpensive gate drives with all 3 phases on one chip. I read the relevant datasheets and application notes and ...
7
votes
1answer
351 views

What H-bridge drivers are preferred for applications controlling a low-voltage motor?

This question is about the following three integrated H-bridge drivers: - L293 or L293D (D = protection diodes added) SN754410 (protection diodes included) L298 (no protection diodes) Time after ...
6
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3answers
464 views

If MOSFET is a voltage-controlled device, then why do we need to supply it with high current when using in an H-bridge?

I might be confusing myself, but from what I am reading so far, a BJT is a current-controlled device and a MOSFET is a voltage-controlled device, which to me implies that a MOSFET requires very low ...
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2answers
110 views

Stepper motor stalls at low frequencies. Why?

I picked up a Howard Industries 1-19-4200 (5 wire) stepper and have been driving it on my testbench with a PIC18F2550 and L293D. I recently added a potentiometer to an analog pin of the PIC for speed ...
2
votes
1answer
161 views

How do I calculate the max pwm frequency my h-bridge can handle?

my configuration: H-bridge with 4 n-ch mosfets (IRF1405) with a gate capacitance of 5480pF and turn on delay time 13nS. I am ...
0
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1answer
34 views

What is the ALS and BLS pin for on the ISL83204A full-bridge driver chip?

The datasheet for the ISL83204A full-bridge driver chip documents "low sense" pins that connect to the source of the bottom N-channel MOSFETs. As those are typically connected to ground, what is the ...
0
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2answers
175 views

Why I can't get a clean signal from my opto-isolator?

I am trying to get working my first Mosfet H bridge. My H bridge characteristics are: 12v power supply 3.5A max current I need to control the bridge from a microcontroller 5V output About 30KHz PWM ...
1
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1answer
338 views

Using p-channel mosfet on high side of h-bridge, do I really need a driver chip?

I know there are fancy h-bridge ic's to drive high side of h-bridge but I guess that is when I have to drive n channel mosfet. I am planning on using p channel mosfets on high side and n channel ...
2
votes
1answer
90 views

Does this H-Bridge need any supporting circuitry?

I'm still pretty new to transistor stuff, so excuse the n00b question. I'm looking to use this h-bridge to toggle a latching solenoid valve, where I need to toggle it on/off with +/- 6VDC. I've used a ...
1
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1answer
185 views

High and Low Side Driver vs. Half-Bridge Driver

Please excuse me for what I am about to say as this type of area is all completely new to me. I am currently attempting to construct an H-bridge (which is a primer to my attempt in constructing a ...
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2answers
80 views

How to create a circuit to reduce my H-Bridge Inputs from 4 to 2, much like the 4427 Dual Driver does?

My H-bridge is identical to the one here: http://www.robotroom.com/BipolarHBridge2.html I'm trying to reduce the number of inputs from 4-2 so I can control it with my arduino using the 2 inputs. In ...
0
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1answer
155 views

Better device than a LM 298

Building a robot that will run on 12V. Using four DC motors and basing my design around an older robot that has been around my school for many years. It uses the LM 298 H-bridge for motor control. I ...
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2answers
260 views

Bidirectional driving solenoid using H bridge and raspberry pi

I want to drive a old phone ringer solenoid bidirectionally (20 Hz) using raspberry Pi GPIO pins. I am new to electronics, but I thought a H-bridge design would work to do this: The solenoid is 500 ...
0
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1answer
243 views

H-bridge output filtering

I'm driving A4952 motor driver with about 25khz PWM signal, with a simple coil connected as a load between OUT1 and OUT2. VBB is variable, testing with 15V but changing it doesn't alter the results. ...