A circuit which allows power to be applied to a load in either direction. Often used for reversible motor control.
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1answer
36 views
What does the RNF pin do on an H-bridge?
The H-bridge in question is a BD6212FP. Pins 7 and 8 are marked "RNF". Below is a link to the datasheet.
http://www.farnell.com/datasheets/46169.pdf
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2answers
64 views
simple h-bridge polarity reversal
I am trying to reverse the polarity on a rather beefy motor (5 amp, 60v) in the most simple way possible.
I need to build an h-bridge just to reverse the current, I am controlling speed elsewhere. ...
2
votes
1answer
60 views
what are the en pins (1,2EN and 3,4EN) used for on an SN7544 H-Bridge
I built the circuit from this page and it works just fine but what I don't understand is what the EN pins are for. It says right on his diagram of the pins that you need to connect it to power to run ...
1
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3answers
257 views
How do I control a two 12VDC 10A motors using an Arduino?
I am new to arduino and electronics in general but I need some help on a project I am working on. Essentially I want to be able to control the state (on/off) and direction of two linear actuators that ...
0
votes
3answers
138 views
L293D maximum current with heatsink
I saw in datasheet of L293D that maximum current per channel is 650mA. I have two dc motors that draw within that limitation. Most of the time, measured current is ...
1
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1answer
118 views
L293 VCC1 3.3v?
I'm building a wireless motor controller using an atmega328p AVR and Gainspan GS1011M wifi module, both of which are 3.3V devices. I've seen several references to running the L293 H-bridge on 3.3V:
...
3
votes
2answers
266 views
Why exactly does Connecting a Motor Directly to an Arduino Damage it?
I understand that you usually need an H-Bridge or some sort of Motor Driver to connect a Motor to an Arduino, as otherwise it will damage it.
But why is this, I mean I realize each pin can only ...
0
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1answer
231 views
What kind of power supply can power this stepper motor connected to an Arduino?
Stepper Bipolar circut: http://arduino.cc/en/Reference/StepperBipolarCircuit
I have this bipolar stepper motor "Stepper motor - 200 steps/rev, 12V 350mA - " which i am connecting to an Arduino. The ...
2
votes
2answers
529 views
Design recomendations for Mosfet H-Bridge
I'm trying to build my first Mosfet H Bridge, the goal is to build a bridge with Vin = 5 - 12 V, Imax = 30 A, managed by microcontroller.
I have read about functional principle and Mosfet parameters, ...
10
votes
1answer
989 views
How can I implement regenerative braking of a DC motor?
I know that many electric cars are able to convert the momentum of the car into stored energy in batteries, rather than convert it to useless heat at the brake pads. How does this work? How can I ...
3
votes
1answer
357 views
driving low side of a mosfet bridge with 3.3V
I'm trying to drive a the low side of a n-channel half bridge with a 3.3V signal that is not enough to switch the MOSFET I think (sometimes it does switch and sometimes it doesn't).
I did this: ...
3
votes
1answer
200 views
H-bridge output voltage
This my first electronics project and it is based on this project.
I'm using a TI SN754410NE H-Bridge to control 2 small dc motors. I'm using an Arduino UNO for the control signals (USB powered) and ...
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1answer
262 views
Bipolar Transistor HBridge Motor Driver:
What is the importance of using the diodes shown in this Bipolar Transistor H-Bridge Motor Driver?
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1answer
104 views
HBridge short circuit between switches
I read that the h-bridge driving a transformer primary of an inverter whould benefit from a phase in which the primary is short circuited, before being switched to the opposite current.
How much this ...
1
vote
1answer
142 views
High voltage H-bridge diode
i'm designing a varable-frequency drive with 2 H-bridges based on IR2108 half-bridge drivers. I want it to drive a 220v single-phase motor. Reading the datasheet i got a little confused on choosing ...
10
votes
3answers
347 views
Full-bridge converter rectifier kicks
I'm in the process of building an 8kW isolated DC/DC converter, full-bridge topology.
I'm seeing some interesting phenomena on the diodes. When each diode becomes reverse-biased, a voltage spike ...
0
votes
1answer
490 views
L298 overheating issue
I'm trying to build a motor driver which can supply ~3A per motor. Only cheap IC I could get my hands on was L298, so I decided to parallel its channels.
But for some reason that I can't understand ...
1
vote
2answers
177 views
Motor Current Limiting Algorithm
I am building a H-Bridge controller dor DC motors, and I want to add some current limiting on it. Does anyone knows a good algorithm for doing so?
I am planning to read the current, and if it goes ...
0
votes
1answer
240 views
Which side to do the PWM in a H-Bridge, High side or Low side?
as the title sugests, I am wondering, is there a better side to do the PWM? I believe the high side is better, because the current will flow through the lower part diodes in the Off cicle, which ...
2
votes
2answers
272 views
Regenerative Braking circuit
I am reading this great website.
I don't understand the topic #4.
I don't see how the current will flow back to the battery, and how the Q2 enabling changes the circuit. As far as I can see, the ...
0
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0answers
89 views
Interchangeability of VNH5019 and VNH2SP30
I have a driver carrier board design for VNH2SP30. It supports a maximum of 16V and because of this I want to switch to VNH5019 which supports 24V.
When I looked into their datasheets (p.20 Fig.32 ...
0
votes
3answers
458 views
H bridge for PWM
I made a schematic for an h-bridge motor driver that will be connected to a MCU.
Is this schematic correct? I'm not sure if the flyback diodes are working correctly since I added that NPN ...
0
votes
1answer
224 views
Most efficient h bridge to run two DC motors in robotics application
EDIT: I was mistaken about the motors, I actually have a pair of DC motors
I want to construct an h bridge that would allow me to control the servos in a boebot. However, I want to maximize the speed ...
1
vote
1answer
642 views
How to drive a high-side N-channel MOSFET with low VGS?
Question first:
Is there a bootstrap driver that is available in DIP, works similar to the IRS2001, but is OK with a VCC of 4-5V?
I'm also a bit limited in the amount of space I have -- is there a ...
1
vote
2answers
245 views
Can I stack two l293d h-bridge IC's to drive more current?
I need more current but I do not want to change my pcb board so can I piggy back two L293D pin for pin? I am driving dc motors and I am not seeing any gross failures but I am very close to the max ...
5
votes
4answers
791 views
components within a triangle in an electronics diagram
I'm trying to understand the following circuit diagram:
Specifically, the four triangles within the L293D component. So I understand there are two transistors in there, connected in series from 24v ...
2
votes
2answers
422 views
ringer circuit old telephone
I am in the process of adapting an old phone to be used as an Bluetooth phone. I am currently testing the ringer circuit, which I build using the schematics provided by Sparkfun.
I wired up the stuff ...
3
votes
2answers
471 views
Can someone help me understand this H-Bridge?
I have an old RC car but without the transmitter so I built my own Rx/Tx using MCU and 2.4Ghz transceiver, however, I want to use the car's original H-Bridge but not sure if I understood how that ...
6
votes
4answers
1k views
Is this a good design for MOSFET H-Bridge?
I have been looking around trying to design a simple but working H-Bridge for an RC car motor (12V and 2~3A).
This bridge will be driven from a microcontroller and need to be fast to support PWM. So ...
2
votes
2answers
522 views
L298 H-Bridge not working
I have an L298 H-Bridge, but I cannot, for the life of me, get it to work.
I have connected Vss to +5v, GND to ground, Input 2 to +5v, Enable A to +5v, Input 1 to ground, Vs to +5v, Output 2 to a ...
2
votes
1answer
164 views
H-Bridge Drive Power Flowing Up Logic
I'm using an H-bridge (L298n) to actuate two motors, so I've connected up a battery pack to the supply voltage in, to power the motors, and I've connected the logic supply voltage in to the arduino 5v ...
2
votes
1answer
396 views
Driving low-voltage H-bridge directly from MCU
I need to drive a small (3.6V, <1A) brushed motor bidirectionally with a PIC MCU. My available space is extremely limited, so I'd like to use a single 3.6V power supply for both the motor and PIC, ...
2
votes
1answer
132 views
Integrated H-Bridge (ST VNH3SP30-E) suitable for low-side current-sensing?
For motor control, I need to monitor its current. Can a simple low side shunt be used for measurement, or will the offset voltage (no direct GND connection) cause problems?
...
2
votes
1answer
156 views
Arduino loses usb connection
When I connect the 5v power supply of my arduino to my h-bridge the usb connection is dropped and the on LED dims. What is causing this?
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1answer
76 views
USB connection dropped and “on” LED dims using Arduino + H-Bridge [duplicate]
Possible Duplicate:
Arduino loses usb connection
When I connect the 5v power to an H-bridge I constructed the Arduino loses its USB connection to my computer and the "on" LED dims.
What's ...
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vote
1answer
351 views
Explain the HIP 4082 pwm input from the datasheet
I'm trying to use an H bridge driver ic, namely the HIP4082 from Intersil. My question is about the pwm input shown on the "Typical Application" diagram from the datasheet. From the functional block ...
5
votes
2answers
379 views
transfer function of a full bridge diode rectifier
I'd like to find the s-domain transfer function of a full bridge diode rectifier with capacitive output filter. Surprisingly, there doesn't seem to be much literature on this.
Analytically, I am ...
2
votes
3answers
963 views
Four transistor/full bridge version of the Royer oscillator
For some time now, I have been trying to figure out what (in theory) would be the most efficient way transfer power across a transformer. Applications include high voltage power supplies and induction ...
0
votes
2answers
387 views
Driving a DC motor forwards and backwards with a PIC
Say I have a DC motor which runs clockwise when current flows in one direction, and counter-clockwise when the current flow is reversed.
I have 2 lines going in my circuit, +5V and ground. I have a ...
5
votes
3answers
566 views
Is it practical to use separate MOSFETs for PWM and direction control?
I have an idea for a design which I'm curious to get some feedback on. Without worrying about support circuitry, consider the following MOSFET h-bridge:
The idea is that Q1 is a high-speed, ...
1
vote
1answer
113 views
If I made an h bridge out of silicon controlled switches, would I still need a driver?
My question is relatively simple. If I arraged four silicon controled swithces, like the one here, to form an h bridge, could I drive it directly from the logic level? Since only gate to gate voltage ...
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2answers
517 views
Safely driving a high power h bridge with optocouplers
I was looking into some high power H bridges (I was hoping to make an induction heater or at least a high voltage power supply). Some I came across are: this, this and this, to name a few.
I noticed ...
4
votes
2answers
320 views
Why do most h bridge modules have more leads than 2 inputs, 2 outputs, and 2 for power?
I have been looking for a simple h bridge for high power applications (say ~2kW total--whether that be 2kV at one amp or 2kA at 1V I really do not care. I figure I can always use a transformer to ...
1
vote
2answers
433 views
How to make an h bridge using only comparators
I discovered I could easily make an H-bridge (or something that effectively behaved as one) by cross coupling the inputs of two op amps. So for op amps 1 and 2, 1+ is connected to 2- and 1- is ...
2
votes
2answers
1k views
Is a bootstrap capacitors always required for mosfet drivers?
I am designing a H-bridge to drive a motor that is running at 12V / 3A.
To prevent shoot-through I decided to select a IC with integrated dead time - IR2111.
What I got so far is the following ...
0
votes
2answers
281 views
Motor Driver Circuit
I am using an H-Bridge chip, given inputs from a PIC16. My problem is that when a motor is NOT attached, I can measure the voltage across the wires that are supposed to be connected to the motor and ...
1
vote
1answer
238 views
12 volt H-Bridge for a 2 volt motor
I designed an H-bridge that must operate off of 12 volt supply, I have a 2 volt motor I need to power, I was wondering with the TIP120 and TIP125 VBe drops of 5 volts each that it would operate the ...
2
votes
2answers
784 views
H-bridge ic for high voltage and/or current
I tend to design my circuits around H-bridges, but the problem with making them out of standard mosfets is that I always have to compare the rise times, fall times, threshold voltage, etc of my ...
2
votes
2answers
1k views
H-Bridge Transistor Smoking (Bipolar BJT Transistor)
I'm using the following circuit, with 12V appplied to the motor, and either high (5V) or low (0V) to each transistor through a 1k resistor. The transistors used are TIP 142 and TIP 147. The diodes I ...
0
votes
1answer
418 views
High voltage H-Bridge
Does anyone know about a full H-Bridge chip that can handle input voltages somewhere in the range 80v to 100v with current rating less than 1A?
The reason I'm looking for this is that in our robot ...
