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

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6
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3answers
186 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 ...
0
votes
2answers
54 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 ...
1
vote
1answer
56 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
votes
1answer
22 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
votes
2answers
65 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
vote
1answer
47 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 ...
0
votes
1answer
67 views

High voltage drop across H Bridge [closed]

I have a circuit built with the schematic below. When I connect it to the motor and turn on the power supply, the voltage drop is big. My power supply voltage is set to 12V but when it is turned on, ...
2
votes
1answer
58 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
vote
1answer
45 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 ...
1
vote
2answers
57 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
votes
1answer
53 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 ...
1
vote
2answers
74 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
votes
1answer
58 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. ...
2
votes
2answers
49 views

L298 dual H-Bridge RDS(on)

I am working on a project that mandates the use of a particular Arduino motor driver shield, which makes use of an L298 dual H-bridge (datasheet here) I need to perform some power calculations in ...
1
vote
1answer
177 views

H-bridge - concern about mosfets

I want to create an H-bridge using MOSFETS (IRL620SPBF). I am trying to run a 6V motor which requires max current of 1.2A . The transistors Q111 and Q112 provide level conversion as the 'signal' comes ...
1
vote
1answer
53 views

H-bridge vs ESC

I'm familiarizing myself lately with the usage of ESC (Electronic speed control). I'm unable to determine when is it the best option to chose ESC over H-bridges? - in terms of advantages and ...
0
votes
0answers
68 views

3A Back EMF H-Bridge with Encoder driver board to Arduino

Apologies for the probably strange title. I'm working on a robot from a previous student at Uni and there is very very little documentation on how it was previously done. H-Bridge x2 Encoder ...
1
vote
2answers
86 views

H-Bridge ic not working as expected

Hi I am using the SN754410 h-bridge driver to try to control a motor using two switches. As I understand the SN754410 should be identical to the L293D. I have hooked up a circuit and I think I have ...
0
votes
2answers
137 views

Single inductor buck-boost idea for MPPT (maximum power point tracking)

Basically my inspiration is this guy's work. A buck converter that provides MPPT as long as the solar voltage is higher than the battery voltage. But I want to extract power to the battery even at low ...
2
votes
1answer
67 views

H-Bridge freewheeling current

I'm building an H-Bridge to drive some motors I have around. I'd like to have a bridge that can be powered by different power sources, for example batteries or atx power supplies interchangeably. ...
1
vote
3answers
190 views

High Inrush Current Causing Large Voltage Spikes

I have a H-Bridge driving a 1200VA 20 kHz transformer. The H-Bridge is rated for 1000W (24V, 42 A). The circuit works very well when VBatt is 14V but the FETs die whenever VBatt is 24V. I found out ...
0
votes
3answers
72 views

Light controlled h-bridge?

I was wondering if it would be smart to control a power H-bridge, with light. Imagine an opto-isolated power stage, where the opto-isolators are sawed in 2 parts connected by an optic fiber. I think ...
0
votes
1answer
45 views

Serial port controlling a motor bridge--unknown bug

This is part of a project where I wanted to bypass using a microcontroller and control motors directly with my laptop. I'm using a usb-to-serial cable and use the serial RTS and DTR to control a ...
0
votes
0answers
15 views

about conversion of h-bridge [duplicate]

I want to know whether h-bridge could convert pwm to ac signal If we give 5v pwm signal to input of h-bridge how much voltage of ac signal will it produce.If possible explain clearly please
0
votes
1answer
55 views

H-Bridge functions and workings?

How much VAC is produced when 5V PWM is fed in to H-Bridge.Does it produces same 5 VAC or will it produce higher VAC.
0
votes
1answer
99 views

Changing the polarity of electromagnet using H-Bridge

I have made an electromagnet using copper coil of 1.0 mm diameter, iron core of 2 cm dia & 8 cm length for my project. Supplied voltage is 12 VDC and current it consumes is 9.0 Amp. It has 1.5 Ohm ...
0
votes
1answer
104 views

H-Bridge diode makes the motor go faster

I am making a little robotics project were my robot spins around a shaft. Since it can't spin a full 360º turn I placed some limits in the software but just to be sure I also placed two limit switches ...
0
votes
2answers
40 views

What is the possible reasons that cause the different motor strokes of two directions

The question may be a little too specific since it refers to some special choice of the motor parts that may not be used for everyone, yet I would like to learn about the general debug methods if ...
1
vote
1answer
73 views

DC Motor Control - h-bridge pulsing strategy?

Question is with regards to a DC motor controller built around an Allegro A4940 and four discrete FETs. There are at least four possible strategies for driving the FETs, and I'm struggling to ...
0
votes
1answer
86 views

Can i use another H-bridge for this bipolar stepper motor drive?

I am driving a bipolar stepper motor with a H- bridge. For this sheet: source Can i use my L293DNE H-bridge driver instead of the pictured SN754410NE? Will there be any consequences for this? I ...
-2
votes
1answer
176 views

control H Bridge using PWM [closed]

I wonder, if I can control the speed a motor by applying PWM on VCC pin at H bridge, not at control pins. I try to do this with an Arduino microcontroller but the output will always be 5 volts!
1
vote
0answers
426 views

L297 + L298 circuit not working

I have paired up L297 and L298 together to make a bipolar stepper driver. My schematics are : I have hooked up the step and direction pin number 4 and 5 respectively on Arduino. I am using a 5V ...
0
votes
1answer
335 views

Alternative to easy-driver (or adafruit motor shield ) on breadboard [duplicate]

I'm up to implementing bipolar stepper drivers with STEP and DIRECTION inputs just as like easydriver and pololu stepper drivers but that on breadboard.Earlier I was using L293D to do that , but it ...
10
votes
1answer
150 views

Why do capacitors across my FETs minimize ringing/distortion?

I'm designing a 24V to 350V DC-DC Converter based on a H-Bridge. The power requirement is 500W and the circuit operates at 20KHz. The design works fairly well and I've achieved about 90% efficiency at ...
0
votes
0answers
59 views

Two wire circuit of H-bridge as Bipolar stepper driver for CNCs and 3D printer and stepper motor vibration and noise issue [duplicate]

So after searching a lot and looking up every Jack and Jill's website for 3/4 axis cheapest DIY stepper driver for the 3d printer and CNC. I have come to the conclusion that using L293d with ...
1
vote
1answer
108 views

Magnetic coupling of inductive loads

I have been working a little bit on a hobby project of mine involving inductive power distribution. I have never done anything like this before and before I hook things together I would like to avoid ...
1
vote
1answer
72 views

Schematic of a follow line robot

I have seen a schematic for follow line robot , but there is something that i cant understand it and which is shown in the figure below , what is the purpose of op-amp circuit , and i know that BREAK ...
3
votes
1answer
214 views

L293D and Arduino working only with common ground.

So I have an Arduino and an L293D. The L293D logic is powered by the +5V output of the Arduino, while the DC motor is powered by an external power supply. Here's the part I don't get. If I connect ...
5
votes
2answers
342 views

Battery power supply for Arduino and DC motors with L293D

I got a 6 AA cell pack. So I can basically get 8.2V. I need to power an Arduino and 2 DC motors driven by a L293D. My Arduino can accept 7V to 12V DC input and the L293D between 4.5v to 36V. Can I ...
2
votes
3answers
196 views

Logic level converter for H-bridge and UART for Raspberry Pi

Here is my situation: I'm using a raspberry Pi to control a H-Bridge. The H-Bridge is not tolerant of both it's inputs being high logic value, which causes a short through the transistors, bypassing ...
2
votes
3answers
166 views

Adding braking to a H-bridge schematic

I followed this schematic to build an H-bridge: http://www.pocketmagic.net/2009/03/a-simple-h-bridge-design/#.UqjoLFXxteW Now, when I first switched it on, I was surprised that the transistors ...
3
votes
0answers
94 views

Return Paths of Parallel FETs

I'm attempting to design an H-Bridge which can supply 24V at 60A. As 60A is a lot of current I decided to parallel upto 4 FETs per leg to split the current. I am using a MIC4102 2A driver to drive ...
1
vote
1answer
93 views

BJH H-bridge going in reverse but not forward, LL transistor overheating

I've built one of this BJT H-bridge to control a DC motor in an old R/C car of mine, but I'm having problems with it and wanted a few tips to help me debug the board. The motor is a 2-wire DC with ...
0
votes
1answer
123 views

L293D outputs different in different motors. Are there different types of DC motors?

I recently picked up a used Spider King RC toy from a thrift shop (http://amax-toys.en.alibaba.com/product/337890538-212191267/rsc_9021_RC_Spider_King_car.html). It had no remote or battery charger ...
1
vote
1answer
97 views

Can I use two LMD18200 in parallel?

I'm building a DCC booster that at present uses one LMD18200 as per the circuit diagram. This gives me a continuous current draw of 3A, however I'd ideally like much more amperage (since I'm running a ...
3
votes
1answer
67 views

IRS2003 half bridge driver

I am fairly new to half bridge drivers and understand the concept of a full bridge. I was looking at building a basic full bridge using 2 half bridge drivers, the driver IC's I was going to use were ...
3
votes
4answers
250 views

Is my H-Bridge design correct

Hello everyone I realised after burning through 6 L293D's that they were getting old. I hated them mostly due to the fact that they were fragile. I also burned 3 of them because of static electricity. ...
2
votes
1answer
242 views

How can I improve this PCB schema for L293D H-brigde?

I am building a machine that requires a lot of steppers, I've used breadboards until now, and now I plan on getting the driver based on a PCB. I have used Fritzing to design the PCB, and since it's my ...
0
votes
5answers
98 views

Understanding a datasheet

Studying an IC component's datasheet, somewhere you meet electrical characteristics for the device. Device is tested under specific conditions (e.g. Vs). How electrical characteristics are affected ...
0
votes
0answers
55 views

Figure out an H-bridge's datasheet [part 2]

[1]Except voltage supply, output current, output peak current and logic input voltage/current, is there anything else I should notice, for controlling a DC motor? [2]Ιn L6205N (PowerDIP20) datasheet ...