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

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23 views

Make a Bipolar Driver Circuit using Transistors [on hold]

I've been looking for a good tutorial explaining how to make an H Bridge, using transistors, to drive a Bipolar stepper motor. I know there are modules that accomplish this but I want to know what's ...
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0answers
19 views

H Bridge Driver for Peltier Control [on hold]

I am using L6206 Full Bridge Driver for peltier control, but this IC doesn't have in-built OCP, Short circuit protection. L6203 has max peak rating of 5A and in my application, I need 2.5A. I come ...
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votes
2answers
46 views

Motor running slowly with no friction [on hold]

This has been troubling me for a while. A few days ago I mounted this circuit onto my breadboard, and even though it works, it does so very poorly. The motor I'm trying to drive is a 12vDC motor ...
11
votes
3answers
808 views

Is there an ideal PWM frequency for DC brush motors?

I'll be using a microcontroller to create a pwm signal for motor control. I understand how PWM and duty cycle works, however I am unsure about an ideal frequency. I do not have my motor in yet, so I ...
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2answers
55 views

Half Bridge with dual powre supply and two N-channel Mosfets?

I wanted to ask (can't find a straight answer) if it is possible to make a half bridge with two N-channel MOSFETs (I have the solution with one nmos and one pmos, but I'd like two nmos). For the ...
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1answer
49 views

High current motor control

When designing for relatively high currents, e.g. 6-10A, what is the standard practice for motor control? Is it to construct an H-bridge out of discrete components, to use integrated half bridges, or ...
3
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2answers
152 views

Why do simple H-Bridges that use PNPs combined with NPNs not short themselves out immediately (or do they)?

There is a simple design for an H-bridge that I keep seeing all over the place. simulate this circuit – Schematic created using CircuitLab This design is featured on the Sparkfun ...
2
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0answers
58 views

What kind of DC motor should I get for raising my blinds? [closed]

I have large blinds that cover sliding glass doors in my condo. Unfortunately, the draw string to raise / lower them pops out regularly. I've decided I want to automate the raising / lowering with a ...
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1answer
68 views

Transistor PWM Switch H-Bridge

Update from old post I have made a completely different design and was wondering if you guys could take a look. Schematics: http://imgur.com/a/5GRe5 Description: Figure 1 is a charge pump, boosting ...
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2answers
131 views

How to connect flyback diodes on a h-bridge [closed]

I'm using a SN754410NE h-bridge to drive two DC motors (4.5V each) with Arduino. After testing the circuit and the code, I made a standalone Arduino on a perma-proto breadboard. My problem is that ...
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1answer
26 views

Microstepping methods for stepper motors: PWM? Phase? Frequency?

I want to know what methods are used for microstepping stepper motors, and their pro's and cons For example, I presume, to hold the motor between two steps, PWM would be most efficient; simple ...
0
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1answer
77 views

h-bridge voltage readings using bipolar junction transistor

I am using the following h-bridge setup using optocouplers, a DC motor and bipolar junction transistors (2N3904 for the NPN and 2N3906 for the PNP) Everything works as expected, but my question has ...
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1answer
38 views

fully Controlled Bridge with BT151

I have tried BT151 for my half bridge controller to drive a DC motor. unlikely, it doesn't work. I would be grateful if you help me through this question. .
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0answers
30 views

L293D calculate output current

How to calculate the output current of an L293D H-Bridge driver, given the input voltages in both A and B input terminals, an enable voltage and Vcc? How should the schematic be analyzed in terms ...
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0answers
49 views

DC motor go very slow in one direction

I try to control a simple 6V with an H-Bridge controlled by a standalone atmega328p/pu, but i found a very big problem. In one direction the motor goes fine, but if I try to change the direction, the ...
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0answers
60 views

Bipolar Transistor H Bridge - low side NPN transistors slow to turn off

I've been trying to build an H-Bridge from bipolar transistors. Here are my parts for the schematic below Q1, Q2 - A1694 Q3, Q4 - C4467 Q5, Q6, Q7, Q8 - 2N5551 R2, R3 - 100 ohm R5, R6 - 50 ohm R9, ...
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votes
1answer
91 views

How do you drive a stepper motor with an L9110 driver module? [closed]

I have a dual channel motor driver module based on two L9110 H-bridges: The documentation and many, many tutorials on the internet mention that this can be used to drive two DC motors, or a signle ...
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0answers
61 views

H-bridge porblem

This is my first experiment with MOSFET. I have built this design but the n-channel MOSFET getting hot. Is there mistakes I have made? I have no problems wit p-channel it measured -12V VGS and ...
0
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1answer
68 views

Motor oscillates when driven by L293D [closed]

I've got problem with steering DC motor with L293D and Arduino. I'm using DC motor from old inkjet printer and a quadrature optical encoder from the same printer to track the position. When I'm moving ...
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2answers
47 views

Diode Sizing for DC Motor H-Bridge

How do I calculate the size of the diodes used in an H-bridge for a DC motor? What is the relationship between the motor parameters and the diode parameters?
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votes
1answer
80 views

H Bridge not working [closed]

I've created an H-bridge for a dc motor that will be controlled by an arduino the bridge has one input and a not gate it has two state forward and backward thats the circuit: it doesn't work :/ How ...
7
votes
3answers
185 views

How to improve the full bridge / half bridge start up time?

I am trying to find out a way to improve the rise /start up time of a series LC circuit placed in a full bridge (or half bridge) circuit. Here is a simplified schematic. The circuit works very well, ...
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2answers
46 views

Current chopping with an h-bridge and PWM

I have some stepper motors and L298N dual h-bridge drivers. I can't find exact specs for the steppers,* but similar motors from another product line have rated voltages from 2.64v to 5.8v. Since most ...
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1answer
44 views

Why is bi-directional current sensing required in sensorless BLDC field-oriented-control?

For the past few weeks I've been trying to understand Field-oriented-control for 3-phase motors. Eventually I would like to implement one. I've gone through dozens of application notes from Microchip, ...
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3answers
103 views

Directly driving 5V source MOSFET H-Bridge with 3.3V logic

I am trying to design a H-bridge circuit for my project to drive a thermoelectric cooler (TEC). Basically, I am trying to control the TEC with a voltage source driven by PWM. Now the problem is, I ...
0
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1answer
34 views

Trouble Driving a Solenoid with a LiPo Battery

I am having trouble getting enough current to drive a bi-directional solenoid with two leads. I am using a half of a L293 (Quadruple Half-H Driver) to drive the solenoid back and forth. The solenoid ...
2
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3answers
121 views

Correct placement of freewheel diode

I have two questions on placement of freewheel diode in a H-Bridge circuit: 1) In reference to the general H-Bridge circuit below, wouldn't it be safer to place the freewheel diodes directly across ...
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1answer
82 views

Braking a motor with power transistors

I am running 2 DC motors with 3 SN754410's: each motor gets one half of each bridge. Everywhere I look I see that pulling both logic inputs low with the enable high should brake the motor by shorting ...
0
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2answers
102 views

Control DC Motor with arduino

Recently I bought this motor and I want to control it with an Arduino. I read that I can drive the motor with a H-Bridge with TIP120 Darlington transistors, but the problem is that voltage in the ...
0
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1answer
139 views

N-MOSFET switching an H-bridge: problems with PWM

In this circuit an Arduino digital pin drives the Gate of a N-MOSFET. When the pin is HIGH, current can flow from the H-Bridge GND to board GND. When it's LOW, current can't flow. What I need is to ...
0
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0answers
45 views

Half bridge mosfet drivers

Hello I'm trying to make a DC-DC converter and I need to drive 2 mosfets using the folowing half bridge driver : http://docs-europe.electrocomponents.com/webdocs/0b3c/0900766b80b3c1b2.pdf Mosfet : ...
7
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6answers
1k views

Why do my P-channel MOSFETs keep dying in this H-bridge?

So this is my H-bridge: Every time I start using it in one direction the P-channel MOSFET and the NPN BJT which belong to the used direction die in seconds. The killed MOSFET and the BJT developing a ...
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4answers
107 views

Transistor Two Way Switch

I am trying to connect the 47 ohm line from the 555 timer (refer to first picture) to either A1 to turn the motors forward or A2 to reverse the motors. Problem is I don't know how to, with two inputs, ...
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votes
1answer
35 views

Does the pwm pin on an lmd18200 have to be connected to a pwm pin?

I got an lmd18200 connected to an Arduino Uno. The pwm pin is connected to the 10 pin on the Arduino. Will this not work?
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1answer
136 views

Need help trying to design an H-Bridge to power electromagnet

I am trying to design an H-bridge inverter to supply maximum current to my coils. I need to supply as much current as possible so that I can make a electromagnet whose polarity constantly flips so ...
0
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0answers
28 views

Pulsed H-Bridge is not turning off quickly at the end of each pulse with large oscillation

The schematic below shows the H-Bridge I'm using. I'm sending in 175us pulses of a ~200kHz square wave. Inbetween pulses, the drive signal is 0 volts (or "High" depending on the which gate driver ...
1
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2answers
127 views

LED H-bridge driver

I have tried to understand the following H-bridge reference design used to drive 2 LED back-to-back. The following image only show one side of the H-bridge. Please correct me if I'm wrong. The P-...
3
votes
3answers
93 views

How to determine whether I need ESD protection? (MOSFET H-Bridge)

I am designing a H-Bridge using IRLZ44N MOSFETs, IR2104 driver ICs and UF5401 diodes. The current circuit looks like this: It will be used on a battery powered device, so no real grounding ...
0
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2answers
92 views

Driving an N-Channel MOSFET H-Bridge from a voltage doubler

I've been looking at driving an H-Bridge to raise the frequency of the mains voltage from 60 hz to somewhere between 60-120 hz. I'm planning to use an Atmel Atiny84 to generate my clock frequency to ...
0
votes
1answer
49 views

Choosing between a darlington array, H-bridge, and solid state relay

I'd like to use an arduino to switch four separate lamps independently, each of which requires 12VDC and 200mA. It seems to me that this could be done with an H-bridge, a darlington array, or solid ...
0
votes
1answer
33 views

Limit current of L6206 bridge driver

I'm currently building my first stepper motor driver, a bipolar stepper, 4.5-48V 1A phase current with 4.5 Ohm phase resistance. I've built the circuit of the L6206 following the "Typical ...
1
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1answer
34 views

L293DD overtemperature protection

I am using an L293DD Dual H-Bridge IC to power my DC motors. I have realized I am using inadequate heatsinks, and 1,5 times the nominal maximum current(1,8A instead of 1,2A), but the circuit is ...
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2answers
91 views

Do I really need an H-Bridge controller in this application?

I'm looking to integrate a latching solenoid in my next project. I found a 5V latching type here: LHLA0531111H The manufacturer recommends I use an H-bridge to control switching of the solenoid. ...
0
votes
1answer
61 views

My H-bridge can't control my 3v motor

I'm trying to control my 3v motor from my 5v arduino. For this i use : 5 volt power source from pc for the arduino L9110 H-bridge module 2 AA Battery as power source for the L9110 H-bridge Here ...
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2answers
111 views

Mosfet H-Bridge Design Question

I have a few questions regarding an H-Bridge design that I like. I am having a little hard time understanding some parts of it. So this is the design that I found online here. I changed the motor ...
2
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3answers
137 views

Boost converter for high side Mosfet

I recently came across an article explaining how to drive a high side MOSFET using a "separate isolated power supply whose ground and the ground of the MOSFET-based circuit are isolated". However ...
0
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1answer
75 views

Would having a DC-to-DC Step Up Converter Damage the L293D H-bridge IC behind it?

I recently purchased two L293D H-bridge Motor Controller from Adafruit (data sheet here), but after reading that the controller could only output a max of 600mA for a short time, I realized I had a ...
0
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1answer
135 views

H-Bridge driver circuit design

I have built the following H-bridge driver circuit (The red resistors R9 and R10 were not included). However during testing I have found that I am constantly blowing the high side P-Channel MOSFETS ...
1
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1answer
165 views

How to convert an DC to AC signal more efficiently H-bridge?

Currently I am working on an project to feed back the output from an solar panel to the grid. One of the circuits used is the H-bridge. This part is used to convert an arbitrary DC signal to an AC ...