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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Shifting voltage levels to drive high-side P-channel MOSFET

I have an H-bridge with P-channel MOSFETs for the high side and N-channel MOSFETs for the low side. I am driving a 32 V source. The source is first divided by two capacitors in order to correct the ...
6 votes
1 answer
226 views

Current-limited H-bridge

I attempted to design my own H-bridge (P-MOSFET high-side), using a comparator hooked to a one-shot to limit current, modeled after the one-shot current-limited schematic described here. Upon ...
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Discrete high-side driver for GaNFET

Background: I am designing a buck/boost converter to convert back and forth between my supply voltage of 3.6 V (battery) and an output voltage of VDD = 60 V to bidirectionally drive a capacitive ...
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Miller Capacitance causing IGBT to turn on in half-bridge

Some time ago I built a H-bridge with 5 paralleled IRFP250N and after a couple of blown-up IR2104s I came up with this driver design that was more about protecting the IC than anything else: Where: ...
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3 answers
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What's the optimal way to drive a 2DI50D-100 power module?

I've been messing around for a couple days with this 2DI50D-100 power module that I got out of an old Italian VFD that I got dismissed at work (I'm an electrician) because it stopped working. This is ...
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TLE 2505 H-bridge not working

Using a 9.4 V power supply and the TLE 2505 H-bridge, I ultimately want to drive a DC motor. Currently I'm debugging using a 12 kΩ resistor in place of the motor on a breadboard and using an Arduino ...
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Why did the Arduino burn in this circuit?

I've designed a PID fan control system which takes air quality measurements via sensors and sets the AC fan motor speed by changing the H bridge frequency. Circuit is as below: Full: Top: Bottom: ...
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59 views

Latching solenoid supply circuit / control

I have done DC motor control with an H-bridge circuit before. I used a 3.6 V, 9000 mAh (ERC26500) battery and had no problems. Now I want to use a latching solenoid and I need 7.2 V for that, so I ...
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H-bridge circuit - Smoke

I'm trying to build an H-bridge to run a high-powered motor, but seem to have done something wrong, since it lets out all the magic blue smoke when I engage the logic to turn the motor. In this case, ...
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4 answers
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Is there a way to use NPN transistor for high side of H bridge at around 400 volts?

I have tried using 2 PNP and 2 NPN transistors for a full H bridge but as high voltage PNP transistors aren't easily available, I want to use all 4 NPN transistors for high voltage.
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High-side gate driver PWM output signal isn't going all the way down to 0 and it's causing shoot through

Over the past week I have been facing this problem where my high-side driver isn't going all the way down to 0 as seen by the simulation below. My low-side driver puts out a good a PWM signal, ...
1 vote
1 answer
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ESD protection and MOS driver concerns for H-bridge

I have been working on a H-bridge design that controls a 12V motor to rotate forwards or backwards at an adjustable speed using PWM from an Arduino. The motion starts slow and increases to max speed ...
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3 answers
153 views

Failing diodes and shorting NMOS and PMOS in H-bridge at 19A

I have been working on a H-bridge design that controls a 12V motor to rotate forwards or backwards at an adjustable speed using PWM from an Arduino. The motion starts slow and increases to max speed ...
-1 votes
1 answer
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N-channel MOSFETs won't turn off in H-bridge circuit

I am trying to follow this circuit; it is a simple 3-phase H-bridge with three N-channel MOSFETs and three P-channel MOSFETs: The problem I am having is when I turn on one of the top (P-channel) ...
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What is this connection for in this H-Bridge circuit?

I saw a different H-bridge circuit than the H-bridge circuits I’ve seen before. What could the connection to the MCU in the lower left of the circuit be for?
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What is the actual operating frequency of a full bridge transformer?

I'm building a circuit from discrete components to run a gate drive transformer to drive the gates of a full bridge DC-DC converter. Before I set the drive frequency and wind the power transformer, I ...
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Why does slow decay decelerate a motor faster than fast decay does in a H Bridge?

I understand how the terms slow decay and fast decay relate to current rather than angular acceleration, but I am currently having a lot of trouble understanding why slow decay decelerates the motor ...
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1 answer
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Why don't inverters use BJTs to easily produce a pure sine wave?

This has been in my mind for a while now, I'm curious. Why not use a BJT H-bridge on the high voltage side, to convert the high voltage DC to AC. I saw a simple circuit that converts square waves to ...
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Cleaning PWM input signal to reduce heating of H-bridge

I'm using a BTS7960 H-bridge to regulate a fuel pump´s RPM. Currently, I'm facing the challenge of extreme heat production. I think the reason is an inaccurate PWM-input signal (picture below.) ...
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Dual brushed motors digital controller works on only one side

I'm actually developing a way to control, digitally, the speed of brushed motors with a Raspberry Pi. To do so, I use the following diagram where: The raspberry controls the shift registers (purple) ...
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If a motor driver IC has shoot-through protection does the controller need to add deadtime?

I'm designing a motor driver and controller system for an E-Bike, and I'm currently using the IRSM836-084MA. The datasheet mentions that it has "cross-conduction prevention logic", but to my ...
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Motor control, PP cap on VBUS rationale?

I often see PP capacitors (big blue thing) close to a H-Bridge or a three-phase inverter. However, on recent designs (Technosoft, Elmo, Maxon...) I see that multiple ceramic capacitors have replaced ...
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How to protect my 120V H-bridge against inductive spikes and calculate and introduce dead time?

I am currently working on this design and I would like to see if I can get some feedback regarding the protection for my MOSFETs and see how I can introduce dead time as I would like to prevent any ...
1 vote
4 answers
219 views

Power transformer circuit using H-bridge doesn't work as expected

I am trying to step up my AA battery's voltage (which is 8 volts in total) using an ignition coil (which is rated for 12 volts input.) To drive the coil I am using an H-bridge at a frequency of 50 kHz ...
3 votes
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Is it possible to control a matrix of motors using H-bridges?

I am wondering if it is possible to control a matrix of motors using H-bridges? A design in my mind is shown in the picture. I haven't seen anyone doing something similar, so I am wondering if there ...
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Bulletproof H-Bridge

I am in the process of building a low frequency (that is, transformer based) pure sine wave power inverter; 24 VDC to 120/240 60 Hz AC. The schematic I've attached is for one quarter of the entire ...
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Isolate digital switching from audio circuit

I'm using an L298 H-Bridge to drive a DC motor. The motor is spinning a magnet across a guitar pickup at ~30 Hz. That signal is then amplified and sent to a speaker. However, the output signal also ...
2 votes
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Do I properly use Toshiba H-bridge TB67H400ANG?

I am new in this forum, so I am sorry if I don't properly ask my "question". I am a beginner in the making of circuits and Arduino programming. (first time using an H-bridge, first time ...
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2 answers
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Output resolution of PWM H bridge drivers such as L298N

I am working on a project which require a high resolution of the output signal of L298N or similar driver. Is it possible to control the output signal with a 1% resolution or better? What is the ...
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Are these H-Bridge motor driver controller ICs capable of reading position info from potentiometer?

I'm specifically referencing two examples of H-bridge motor driver controller ICs (BD6210 and WT7901). To more fully understand and troubleshoot the circuitry of a typical exercise bike or elliptical'...
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H-Bridge with highly inductive load

I am trying to understand the H-bridge, I have edited the circuit and followed the advice in this thread. Is this a good H-bridge design for excitation of the magnetic core which is highly inductive ...
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IGBT driver IC TCC4421 getting hot when connected to IGBT gate through a toroidal transformer

A strange overheating problem: A TL494 PWM controller pulsating a TC4421 buffer IC, which is connected through a series 0.47uf capacitor to the primary of a toroidal transformer. The secondary is ...
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235 views

H-bridge with 6 MOSFET?

Searching Amazon for a PWM controller board I found this: https://www.amazon.com/dp/B07MH43SXR Apparently, they are 6 MOSFETs. I understand that an H bridge is built with 4 MOSFETs. Is there any ...
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Using H-bridge gate drivers to drive MOSFETs in non PWM applications

I am using IR2110 to drive a highside MOSFET which I intend to use to control the charging of a lithium ion battery (disconnecting it from the charger once full). I am not using any PWM control ...
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233 views

Why is there a MOSFET here?

On the TI DRV8703-Q1 H-bridge, there's a MODE pin to select the control interface. What's the purpose of the MOSFET highlighted ...
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1 answer
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H-bridge gate driver for an ESP32

I used an H-bridge for 12V 10A brushless DC motor. The motor must run in both directions. ESP32 ----- Multiplexer Circuit ---- Gate Driver ---- H Bridge ---- Motor I have a few questions. Am I using ...
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Driving a gate driver with another gate driver

I have an IC with integrated gate driver. This IC has an integrated logic, charge pump and gate driver section. Unfortunately, the rated voltage of my application is higher than the ICs rated voltage. ...
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Drain current spikes when switching on MOSFET with LT1160 driver

I'm designing a control circuit meant to drive a proportional valve. I'm trying to simulate the driver and mosfet side of things in LTspice using the LT1160 half bridge driver and two readily ...
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Low Cost andd Urgent H Bridge Need?

I am Creating a H Bridge for 4 x 12V 5A BDC Motor with driving ESP32 Digital Output. Do I need any Components? because I Must be Small PCB design. (Maybe I can place 1k Resistor to N Channel MOSFET ...
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Dual H-bridge DC motor driver using logic voltage supply and not actual voltage supply

I am trying to control two 12V motors with this H-bridge board using a 12 V 7 Ah battery and an Arduino Uno. What I have noticed is that my PWM signals are acting as on/off, and the motors are ...
2 votes
1 answer
103 views

Emissions issue with H-Bridge driving piezo transducers

I have the following block in a PCB design: This drives a ~ 5W piezo transducer at 113KHz. The functionality of the system is great, nothing heats up at all. The issue is when I did a quick pre-...
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1 answer
107 views

Turn two circuits on and off one at a time

simulate this circuit – Schematic created using CircuitLab I want to use two MOSFETs to supply power to two different circuits. However only one of these MOSFETs can be on at a time. One FET for ...
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What are the limitations of AC coupling a MOSFET gate?

I came up with this AC coupled half bridge for high positive and negative voltage output with logic level control that I cannot find in any resources about (probably due to wrong search terms): It ...
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Powering up l298n module

I have a l298n motor driver, hbridge, which i am using with my raspberry pi. I am supplying 6V to the hbridge from a battery holder that takes 4 AA cells so in total it is supplying 6V, yes. Now the ...
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Is the L298N H-bridge in FPGA (Intel DE0-Nano-SoC) compatible?

I am trying to write a code that controls various DC-motors through a multi L298N H-bridge using FPGA (Verilog or VHDL). I have a PWM signal generated right now, but can't figure out how to write to ...
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SCR inverter (thyristor H-Bridge) schematics/working principle?

Several online articles mention the so-called "Single phase SCR Inverter". Sample schematic is attached below. In reality, this, of course, will not work, since SCR2 when activated after ...
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Why use a PNP transistor on the high side of an H-bridge?

A lot of H-bridge diagrams feature PNP transistors on the high side. I have not found a satisfying answer as to why they do that. My reasoning for using a PNP on the high side was that I did not want ...
1 vote
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Ultra Low-Power H-Bridge (micro Amp)

I'm working on a project to drive a pair of electrodes, one at 12 V and one at 0 V, with a very low-frequency polarity change (every 10 minutes). The current draw across the electrodes peaks at 200 uA,...
1 vote
1 answer
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Inverter filter heating up

I have a full-bridge inverter whose output is connected to an LC filter, like in the following image: The power supply is at 20 V, the switching frequency is 100 kHz. The output is a sine wave with a ...
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H-Bridge using 2 half bridge drivers shorts when powered on

The goal is to control various Peltier modules using an H bridge and a PWM signal. I've designed this schematic and made a PCB out of it. It is an H-bridge using 4 IRLR7843TRPBF high power MOSFETs and ...

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