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

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Manual control of a stepper motor using a joystick

I'm building an X-Y table controlled by stepper motors, and would like to be able to control them manually with a joystick for calibration purposes as well as with a microcontroller, switching between ...
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1answer
65 views

H Bridge not working [on hold]

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
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3answers
147 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
28 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
17 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
62 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 ...
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1answer
31 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 ...
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3answers
104 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
73 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 ...
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2answers
76 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 ...
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1answer
95 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 ...
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0answers
42 views

LTspice IV ir2110 H-bridge simulation wierd behaviour

I want to simulate H-bridge using LTspice. At some point Ho stops working correctly. I am using ir2110 typical connection as schematic. This si up to the point where is it working ( but schematic not ...
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0answers
31 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 : ...
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votes
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
95 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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1answer
32 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
97 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 ...
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0answers
23 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 ...
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2answers
110 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 ...
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3answers
71 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 ...
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2answers
72 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 ...
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1answer
43 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 ...
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1answer
29 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 ...
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1answer
33 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
90 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. ...
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0answers
60 views

Circuit components work individually but not together (buck converter and h bridge)

I need to regulate 15V to 12V to power a 12V motor. Additionally, I am using an h bridge so I can control the direction of the motor. Thus, our power path is 15V supply -> buck converter (12V out) ...
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1answer
53 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
96 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
103 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 ...
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1answer
63 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 ...
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1answer
105 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 ...
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1answer
135 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 ...
0
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1answer
57 views

Driving MOSFET with load on source

I would like to know what circuitry I will need in order to drive a N-Channel MOSFET (IRF1405) with the load placed on the source. From my understanding the laod is placed on the drain however I ...
0
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1answer
134 views

Can you drive a motor bidirectionaly with just N channel mosfets?

I bought a bunch of IRFZ44Ns from China in the hopes of driving a motor bidirectionaly controls from and Arduino, but now I realise that a full bridge requires both P and N channel mosfets.. Is it ...
0
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2answers
115 views

Arduino hacked rc car, H bridge, logic voltage overwhelmed

I have hacked my old rc car like in this tutorial here I have measured manually the h bridge logic voltage (the voltage that the transceiver send to the h bridge) , which is 3.7volt in the ...
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2answers
64 views

Harmonic's equations within Single Phase Full Bridge Inverter

Is it possible to find the equations of certain number of harmonics (Ex : 3rd, 5th, ... 17th) in Single Phase Full Bridge Inverter theoretically, using the characteristics of the components of the ...
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2answers
79 views

Scr triggering design, shuld i use four pulses for each SCR ot two for each pair of the SCR?

I have used a TRIAC and an MOC3021 opto-coupler connected to a PIC16F887A to simulate a a full wave rectifier. I am now to design the same using an SCR h-Bridge. My question is, in order to trigger ...
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2answers
252 views

Will this simple four n-channel mosfet H-Bridge Circuit work?

This is my H-bridge circuit without considering Back EMF. In the real circuit I would put four fast recovery diode to eliminate the Back EMF.Maybe schottkies? Before I came up with this design , I ...
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3answers
108 views

h bridge leaking current?

I have built an H-bridge with the following schematic. My motor controls a wheel that I want to turn backwards and forwards. The voltages to the bases of the BJTs are supplied by an Arduino. the ...
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1answer
64 views

Current split on sn754410 chip and electromagnets?

Here is the schematic, except this uses the L293d I wanted to better understand how does the current split (if it does) between two of these IC chips wired as diagrammed with 2 electromagnets on ...
3
votes
1answer
93 views

MOSFET fast turn-off not enough

I have a PWM bridge driving a higher than 1k load from 200V supply. The simplified, equivalent schematic is this: The drivers I'm using are slow turn-on/fast turn-off and, in the schematic, it's a ...
2
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4answers
141 views

Designing a gate voltage for N-channel MOSFETS for H-bridge controller

We have a project where our 2nd year students build an H-bridge controller from scratch. They learn a lot about power dissipation. We have a simplified design using IRF540 for the N-channel, IRF9540 ...
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1answer
218 views

multiple motor h bridge?

I see a lot of h bridge diagrams on the internet, more or less like this: If I wanted to connect let's say 4 motors in h bridge configuration while using the same power supply (12v) for all 4 of ...
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1answer
100 views

very low power h bridge

I am trying to direct a bi-directional dc motor that is about 1.5v (i got it from a micro servo and it is about half the size of a 130 dc motor at 1.5 - 3v) with the smallest power source/battery ...
0
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1answer
54 views

Consequence of uncomplimentary MOSFETs in Hbridge

I am constructing my own H-Bridge to control a high current motor (24V at 25A), as such I was looking to use high current MOSFETs for each quadrant of the H-bridge. My go too MOSFETs for these ...
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1answer
59 views

MOSFET H-Bridge Shunt Resistor position

I am designing a MOSFET based H-Bridge to handle high current. I would like to place a SHUNT resistor in the circuit in order to detect over current. The voltage across the shunt resistor is to be ...
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2answers
105 views

Protect circuit from current generated by backdriving DC motor

In our application we have two modes of vehicle operation: manual and autonomous. Meaning that when vehicle is operated autonomously we control a brushed DC-motor using an H-bridge. In manual mode we ...
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1answer
79 views

Can the high current motor change the ground potential level in the H-Bridge?

I'm planning a half-bridge driver with bootstrap IC-s. My motor runs on 12V, with 50-60A. I linked the schematic. I supply the bootstrap from an other battery (7.2V). Due to the big current, can the ...
2
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1answer
176 views

Shunt resistor choice for H-bridge current sensing

I'm trying to construct H-bridge using DRV8701 gate driver. This part expects you to attach low-side shunt resistor to measure current going through motor to limit your duty cycle if motor is stalled. ...
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1answer
88 views

driving 10A motor [closed]

I have made a wireless robot with ht12d/e and l293 ic and i have used two type of motors. first motor(plastic geared) was working ok with l293(i.e it was working at 1A) second motor(johnson geared ...