Questions tagged [h-bridge]

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

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34 views

Blackout Protection for H Bridge with Synchronous Rectification

I'm designing an H-bridge motor controller with synchronous rectification similar to the Ti Stellaris RDK-BDC24 link here. Synchronous rectification has the promise of handling the back-emf from a ...
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98 views

How does this modified H-bridge circuit work?

I am trying to design a circuit which will have as an input a single microcontroller pulse which will cause a circuit with two 555 timers to output two consecutive pulses which are able to have their ...
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31 views

Why these resistors on the Pololu MC33926 carrier?

I'm trying to design a motor driver carrier for the DRV8873 chip, and I've been looking at Pololu's motor driver carriers as reference material. I noticed that they have inserted 1k resistors on all ...
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Problem with the L298 datasheet

I was studying the L298 datasheet and I noticed something; So basically an H-bridge contains two PNP and two NPN transistors as shown in the image: but in the datasheet, there are no PNP transistors ...
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52 views

How to route a stepper motor through an H-bridge and back into an Arduino?

So I’ve gone and tried connecting the VCC and GND of a six lead stepper motor (just the two) to the BTS7960 H-bridge, and through that connected to my numbered 0-n pins for I/O on the Arduino Leonardo....
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28 views

How does the L239D IC H-bridge work?

I would like to understand the design of the L239D IC. I have read the schematics and datasheet and know how to use it but I wish to know a little more about its design. The left part of this image ...
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58 views

Low cost 1A-5V h-bridge ( MOSFET or BJT)

I like to build 8 dual direction PWM dc motor drive for dc motor with around 5V and 1A max current like shown below, and control it by Arduino with shift-register IC like 74HC595 : So I googled and ...
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103 views

Is this a H-Bridge, why are the two ICs there?

I would like to know if this is a H-Bridge: Why is there IC3 and IC4? Is it because you can't use the MOSFETs with as low voltage as 3.3V? This motor is probably driven with a STM32 and PWM. I have a ...
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29 views

Comparator H Bridge current sense negative voltage input

I'm using lm339 basic comparator to sense current from an H Bridge. Current limiting was done somewhat successfully with acs712 after removing the capacitor from filter pin for limiting the bandwith. ...
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19 views

Driving a BLDC motor, having three switches on at the same time

I am currently working on a 14p BLDC motor and I wanted to drive it using 180 degree commutation (having 3 switches on at the time instead of 2). How can this be achieved? how can I know the correct ...
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45 views

Relay H-bridge current paths

I have created a circuit that can basically make a motor run in both directions using an on-off-on SPDT rocker switch and two relays. Here is the circuit. The catch is that this motor is 30 A at 12 V....
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61 views

how to generate 70V AC from TLP222G-2

I have 70VDC 30mA source I need to control optoisolators to generate 70V AC signal I can use TLP222g-2 dual isolators. to build the h bridge I have a single PWM channel from my MCU. Is it possible to ...
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38 views

Half bridge IC PWM not working properly

I am trying to use an A3916GESTR-T half-bridge to drive a brushed DC motor however I am running into several issues. The largest of these is the fact the output of the half-bridge does not match what ...
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25 views

H-bridge PMOS VGS value

I'm trying to figure out how to determine the VGS of the H-bridge (M5) in theory. D1 is a 3.3V zener diode. Since the PNP is off in this case, shouldn't the gate voltage of the PMOS be 20.7V and VGS ...
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38 views

What's the smallest footprint dual H-bridge?

I am designing a circuit with 4 small electric motors. The motors I selected are SMT and are driven by 3V power source. It makes sense to drive each pair of motors by a dual H-bridge, but I can't find ...
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45 views

Low voltage on 300V H-Bridge

I'm trying to make a 300V H Bridge for an electrostimulator. The circuitry is as posted here, using MOSFET P20NM60GP: When I tested it with low voltage supply (just for the sake of safe testing), and ...
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38 views

Using a MOSFET array to create a basic H bridge

I still have this big old rc car and i wanted to make it live again since I lost the radio. I wanted to take the UPA1556AH that is inside the rc to make a H bridge and control the servo motor ...
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1answer
31 views

How to interface with an H-bridge IC (L298N) using a single PWM pin

I would like to know if it's advisable to control an H-bridge IC (L298N) using a single PWM pin? Let me explain: By driving ENB pin High and by feeding complementary PWM (achieved by using a simple ...
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1answer
52 views

Single input controlled full H bridge for piezo buzzer

I would like to incorporate a buzzer in a PCB design. It would not be a coil buzzer, but more a piezo buzzer, and its operation is to be controlled with a micro-controller powered by the same voltage ...
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53 views

H Bridge not working on HV

I'm trying to make a 300V H Bridge for an electrostimulator. The circuitry is as posted here, using MOSFET P20NM60GP: When I tested it with low voltage supply (just for the sake of safe testing), ...
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2answers
170 views

Why it is preferred to use PNP and PMOS for pull-up, and use NPN and NMOS for pull-down

I have noticed that when I was designing universal logic gates like CMOS NOR gate that uses PMOS for pull-up and NMOS for pull-down. Then I faced it for second time with the H-bridge circuit, but ...
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164 views

My Coilgun Stage Driver Keeps Burning Out Mosfets. Any idea why?

Here's my stage driver circuit: The circuit worked as expected at around 100v. But at 330, both mosfets burned out at the first firing, and the entire cap bank discharged through the coil. I thought ...
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58 views

What's the best way to control DC current in a circuit from 1mA-20mA at 15-30V input with a microcontroller?

I’m trying to create a circuit for iontophoresis that I can control the current of with a raspberry pi or eventually a microcontroller. What would be the best way to control the current? ...
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34 views

I'm trying to build an inverter circuit in LTspice using voltage controlled switches

I'm trying to build a H-bridge inverter circuit on LTspice, but I'm having trouble with getting a correct waveform. The upper and lower switches do not appear to be in sync (i'm not getting a complete ...
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51 views

Understanding flyback diodes in an H-Bridge

I am able to understand the use of flyback diodes when a basic low side unidirectional motor switching is done with an N channel MOSFET for example. I also understand the working of H-Bridge ...
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30 views

Thermal protection effectiveness against short circuit

I'm using the L6201PS H-bridge to drive a 48V DC motor and I broke one of the H-bdridges (when I drive it in the forward direction now, both OUT1 and OUT2 are 48V instead of OUT1 at 48V and OUT2 at ...
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2answers
123 views

H Bridge runs for few minutes and MOSFETS start smoking

I have created an H bridge as shown in the schematic below. PWM signal to the MOSFET driver is given by a microcontroller running on 5V. The MOSFETS are screwed to heat sinks. To control the motor ...
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45 views

Odd hundreds of amps when switching on braking after adding braking resistor to H-bridge

I am trying to deal with current being rejected by a H-bridge when doing dynamic braking of a motor: to control the amount of braking, the PWM duty cycle adjusts the time the motor spends coasting (...
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65 views

In a H-bridge, when the motor is actively braked, why is the supply providing power when kinetic energy decreases?

In a H-bridge, suppose a brushed DC motor has been provided +24V for some time, such that the winding current has reached +1A and the back-EMF has reached 23V (R=1Ohm in this example and no other ...
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145 views

I'm building an H bridge and I'm stuck at some point

Here's the H bridge I'm building Vcc = 9v 10 k resistors for the pullup 1k resistor for the transistor 2 PNP BC557 2 NPN BC547 2 push buttons It should have a DC motor but I'm using LED and a ...
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41 views

L293 DC Motor Driver : How to set up PWM

So Im using a L293 H bridge driver, to manage a DC Motors Speed and Direction. In every tutorial I see online people use the 1A and 2A inputs as the direction management inputs and the enable port as ...
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64 views

Why the voltage across MOSFET (VDS) is increasing even when the voltage at the gate (VGS) is constant?

Following is the screenshot schematic for Buck-derived half-bridge isolated DC-DC converter in LTSpice. In the following plot it can be seen that when the lower switch is turned off the voltage ...
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120 views

Only spikes in H-Bridge

I'm implementing a 300V MOSFET H Bridge with IR2110 driver. I decided to first try it in low (and safe) voltages, thus replacing the 300V with 12V as shown in the diagram. The MOSFETs I'm using are ...
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75 views

How can I use pull up and pull down resistors in an H-bridge?

I have to build an H bridge out of the following components 2 PNP transistors 2 NPN transistors battery 9V 4 resistors for the transistors a DC motor I connected the above equipment but, I also ...
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1answer
30 views

Half-Bridge Start-up State

I recently started to start working on a project where I started using a half-bridge to turn on and off a device that normally plugs into a wall outlet (120 VAC, 60 Hz). In the future, I am looking to ...
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1answer
148 views

How to setup the NCV7708B h-bridge/double hex driver?

I am working on a circuit to control an electromechanical display and settled on the NCV7708B Double Hex Driver (datasheet). I created a minimal setup on breadboard in order to test the chip: I ...
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1answer
44 views

Circuit to control 24VAC OR 24VDC solenoids

Is there a circuit out there that could control both 24VDC or 24VAC solenoids from a 24VDC power supply? I am working on a sprinkler control board that I would like to be able to use both on. The ...
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1answer
70 views

MOSFET full H bridge, voltage spike protection

Preface, I'm a hobbyist not a electrical engineer, so please be gentle. I was looking for a better than l298N motor control solution for higher currents and one that is similar price and size, but ...
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1answer
134 views

power mosfet with stm32

I started this circuit with stm32. But it doesn't work properly. When I set zero to all four pins and I don't want any movement, the voltage of 3 volts is at the two ends of the motor again. Or if I ...
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29 views

supercapacitor regenerative braking question

I am doing a heavy vehicle project and putting a regenerative braking system into the vehicle. It also has a supercapacitor module in parallel with the battery (which has the same voltage), and the ...
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2answers
72 views

Are ultrasonic Tx/Rx pairs really just the same sensor?

I want to retool the classic HC SR04 rangefinder to be able to do ToF gas flow sensing. I need to be able to do ToF on a column of air in both directions, so it benefits me to be able to use the ...
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Peak Recovery Current in Inverter Diode

I have an H-Bridge module comprising four IGBTs with flyback/inverter diodes incorporated [Vincotech FZ074PA075SM] which is intended to reverse a current of around 50A in the circuit to field coils of ...
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256 views

How to drive DC motor with stm32?

I have a 6 volts DC motor and want to control it with stm32 and change the rotation direction. Previously, I designed an H-bridge, I used for the upper part IRF9630 and the lower part IRF630,I ...
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53 views

Problem in H-bridge by stm32f103c8t6

I have a 5 volts DC motor and want to make H-bridge. This is my schematic: I doubt whether the transistors I used are correct. IRF9630 on top and IRF630 on bottom. Could I use BJT instead of MOSFET? ...
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177 views

Real world brushed DC motor bulk capacitance calculations

There's a lot of great information on driving DC brushed motors from h-bridges. Preventing back-emf with diodes and bulk capacitance from electrolytic capacitors When designing a high powered h ...
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32 views

switching frequency 5206-2G

I would like to use the 5206-2G H-bridge for my wireless power transfer circuit, but i can't find the switching frequency which the FET's can tolerate. I have looked several times at the datasheet, ...
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103 views

Verifying maximum switching frequency calculation of a hard switching IGBT

I have recently been working on a power H-Bridge meant to drive an inductive load in hard switching mode. I calculated the maximum operating frequency limitation due to maximum power dissipation of ...
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1answer
126 views

H-Bridge shoot through at high voltage problem - Don't know the cause

I have this H-bridge circuit The circuit is for driving a 180VDC motor, it is built to taking in the High Bus voltage from 169VDC to 340VDC. it works with no problem up to 310VDC. However, at 340VDC, ...
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72 views

Single H Bridge to control multiple DC motors

I am looking to control multiple DC motors off of a single H bridge. I only need one active at any given time I need direction but not speed control. I'm not looking for a product recommendation, ...
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51 views

What value of inductance and type of inductor should i choose for my motor driver circuit? [closed]

I am current design a DC motor driver circuit for 24 volts and 50 amperes since the motors I am using take 25 amperes nominally. I will be using PWM signal to control the output. I was suggested to ...

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