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

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Bidirectional control of two different actuators

I have two actuators, part of two different mechanisms: A cheap brushed DC motor with gearbox coupled to 2 limit switches A Firgelli L16 linear actuator with protective limit switches (not ...
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1answer
39 views

How a P-Channel Mosfet works with a pull-up resistor

I have been desperately trying for days to troubleshoot this h-bridge I build so I'm trying to completely understand it first. What I don't understand is how R1 and ...
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48 views

H-bridge: Augmenting output from an existing IC

I've got a bunch of these integrated H-bridge & driver IC's in my stock and wish to use them in an upcoming design: ...
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52 views

Malfunctioning H-Bridge

A PCB that I designed just came in (schematic pictured below). After soldering the components in, some things are happening that I don't understand. Most importantly, one part of the circuitry, an ...
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45 views

generating sine pwm in orcad pspice

I am trying to design a PWM inverter in Orcad PSPICE where i am using a Vpulse source from library to generate MOSFET triggering pulses for H-bridge and it works fine for square waves. But i if i ...
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1answer
67 views

How to determine the value of a decoupling capacitor across a Peltier device?

I have a TEC device (Thermoelectric Cooling device/peltier device), and I have seen several datasheets recommend placing a bypass capacitor across the TEC device (i.e. parallel to the TEC, and in ...
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30 views

Variable frequency drive power transistor selection

I'm designing a variable frequency drive for a single-phase induction motor driving a water pump. The motor power is 1.3 kW, it has 2 windings with resistance of 1.5/3 Ohms. My local electrical grid ...
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49 views

How to discharge a capacitor quickly…(filter of an H-bridge/inverter)

I have used four IGBTs to build an H-bridge… the inputs of the h-bridge are SPWM and are programmed in a way as shown below: The output of the H-bridge is a three level pwm(as expected), and then its ...
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48 views

Mosfet to save power

I am making a battery powered project which involves bi-directional motor control. However motor needs to turn rarely (about 10-20 seconds in 24 hour period). I am using L298 motor driver. However the ...
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41 views

H bridge control timing

I have a FET based H-bridge being controlled by a micro. I was worried about software errors being able to turn on the top and bottom FETs at the same time, so I opted for the control scheme below for ...
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43 views

Deliberate Shoot-Through in H-bridge for EMI reduction

today I was analysing an H-bridge driver circuit in a commercial product which is used to drive a DC motor (approx 24V/4A) over an unshielded cable with about 1.5m length. When I did a simulation of ...
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29 views

How to get constant current across varying Rload in h bridge

My I is a constant source of 10 mA from Vsupply of 50V, so my Rload can max at 5k at 10mA. I load is going both directions. My Isource is constant, but Iload is changing with varying Rload, why is ...
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37 views

H-Bridge help (Choosing MOSFET)

I need help with choosing MOSFET for H-Bridge for driving my arduino bot. I have got 2 dc motors to use, so I need 2 H bridges, I am trying to make it as small as possible. I need to control speed ...
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69 views

what are the standard ways to generate sine wave using Hbridge and micro controller?

I'm in to driving an h-bridge made of two ir2110 and the pulse width modulation(pwm) signals will be provided by the micro controller. I did some some groundwork to understand how sine pwm is ...
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2answers
65 views

H Bridge Motor free wheeling path

Background: I am not providing diodes for free wheeling of motor as: - I have one big capacitor, 100uF - CW and CCW will be switched with dead band delay of 1.5 to 2.5 seconds can there be a Hbridge ...
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2answers
57 views

how to filter out noise while measuring voltage across H bridge?

I am using a 3 ohm resistor in series with H bridge driver to detect stall current. When it stalls the current shoots upto 200 mA causing a drop of 0.6 V. I am measuring voltage across the H bridge ...
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1answer
77 views

Can I use SCRs as the uppers in an H-bridge?

One might wish to switch DC through a transformer with an H-bridge. I'm leaving out antiparallel diodes and snubber caps, for simplicity. simulate this circuit – Schematic created using ...
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57 views

Help me clarify this really unclear diagram?

5.2 Reduce control IC exposure 2a. Connect VS and COM as shown in Figure 6. http://www.irf.com/technical-info/appnotes/an-978.pdf (H-bridge application notes) Do they want me to connect ...
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67 views

Car window motor control output

I'm toying around with a car window, and used this tutorial to try and make it work: https://itp.nyu.edu/physcomp/labs/motors-and-transistors/dc-motor-control-using-an-h-bridge/ I've set it up almost ...
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1answer
43 views

Double VCC across motor

I have a motor which runs in only one direction when excited by a square PWM at 500kHz with a voltage of 5.6V across the two pins of the motor. Consumption is around 100mA. I have a 1.8V square ...
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1answer
48 views

Circuitry for the DRV8840 Motor Driver

I'm building a circuit based on the DRV8840 (datasheet: http://www.ti.com/lit/ds/symlink/drv8840.pdf). Unfortunately, I can't get it to work. I think something might be wrong with my design. When I ...
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43 views

What is a Half Bridge Circuit?

I'm having difficulty understanding what a Half Bridge circuit does? Would you please describe what it does and what is its purpose? Is it used to switch a load at a certain frequency? Also what ...
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2answers
75 views

voltage drop over IRF9540 = IRFZ440N H-Bridge

I am trying to build a simple H bridge as part of a learning curve. At the moment it is on a breadboard. I am using 2 P-Channel MosFets (IRF9540) and 2 N-Channel MosFets (IRFZ440N). They are tied to ...
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48 views

Trilevel PWM for H-Bridge, potential shortcircuiting in inverter

Here is the schematic I have followed, mine is not exactly the same, but for the most part, it follows the same method, generating a sine and triangle reference, generating a square wave and then ...
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64 views

Filtering the output of an H-bridge

What's the best way to filter the output of a H-bridge? I have a PWM output at +/- 20 V and I want to get a 10V RMS sine wave out at 50hz Also is there a way to do it without inductors?
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65 views

Cause of shoot-through in H-bridge

I've designed an H-bridge for a 15A DC motor. Power is applied by plugging in a very high-capacity Lithium battery. Unfortunately, when I plug in the battery, one of the transistors goes pop instantly ...
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84 views

What is causing this level shift in my wave?

Excuse the quality, sorry; RED is GATE of Q2. YELLOW is GATE of Q4. 5V INPUT AT ALL STAGES What are possible reasons that my H-bridge has a little 'bump' at the turn-off of the high-side? It's ...
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76 views

How do you correctly measure the gate voltage of a MOSFET?

If you have a half-bridge, or an H-bridge, or some other usual configuration; and you want to see the voltage you are getting on the gate, to check for any errors and shoot-through. Do you do it like ...
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1answer
123 views

How to pick a microcontroller? [duplicate]

I have a rudimentary understanding of electronic components and computer architecture. I've built a CNC laser engraver. I created my own h-bridges, and my own laser driver, etc. However, the device is ...
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66 views

Testing an h-bridge using the power supply and/or signal generator to control a DC motor

I'm using the DRV8836 (datasheet here) from Texas Instruments and can't seem to get it to work. Does it require a PWM (pulse from the signal generator) or am I able to drive it with only the DC power ...
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3answers
94 views

Circuit design recommendation to prevent a failing regulator

I designed a PCB that contains, among other things, a switching regulator circuit and an H-bridge for a DC motor. The whole circuit is powered by a 15V Lithium battery. The switching regulator ...
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93 views

Where do you put the gate-protection zener diode in an NMOS H-Bridge?

Do you even include it for an NMOS H-bridge? Because typically I've only ever seen them in NMOS/PMOS bridges, not full NMOS bridges. (Inductive load) The protection zeners would go here right?
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56 views

Critique and dos/don'ts for an H-bridge PCB design?

Honestly have no idea if this is something this site was made for, but I have a couple of questions about my design, mainly it comes down to "Will it work?" and "Why would it break?". JC1 and JC2 are ...
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151 views

Drive DC Motor with H Bridge(H Bridge turns off too slow and problem with current monitor)

I have two questions about my circuit, drving DC Motor with H Bridge. The picture below shows my design and how I drive it with signals. For example, when I make the motor rotate forward, I give ...
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3answers
76 views

H-bridge tiny spike?

My high and low side gate measurements to GND show a tiny little shoot through spike. Adding dead time, Zener bypasses over R(g) and from G-S, and TVS diodes does not do anything. The load is 100K ...
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25 views

H-Bridge driver misfiring and referenced to >VCOM?

Circuit below. Circuit is a full-bridge with IR2183 drivers being operated at 12V. Measurements were taken with reference to GND at JC2. Hey, take a look at this stuff, HIGH SIDE IN RED, LOW SIDE IN ...
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75 views

H-Bridge controlling circuit

I'm in need of an H-Bridge capable of driving moderate-high current for motors on a small car (7A peak, 2-3A nominal, 12-14 VDC), and I'm hoping to control it with two (2) digital pins (5 VDC). I've ...
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128 views

Stepper Motor H Bridge High Side N-Mos Burn Problem

Last year, i designed a stepper motor driver card with DRV8711 and CSD17506. I am driving my stepper motor with Vm=24 Volts and motor current Im= 2.14A. Texas Instruments gate driver drv8711 is ...
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126 views

wiring for a 4 wire AC motor

I have a working garage door opener and I'd like to use its motor for building a edge sander (woodworking). The model number is the Genie IMS1000 and here is the actual picture. It has a single ...
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424 views

Why use a N channel MOSFET as high side H bridge switches?

I've seen N channel MOSFETs as high side switches of H bridges quite often, which requires a charge pump to drive. Wouldn't a P channel MOSFET be easier, simply isolating the microcontroller command ...
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1answer
33 views

L293ne wireing help

First real project in many years so please accept my apologies of this is a silly question. I want to use the L293 to drive a motor (or 2). Using a raspberry pi which I have done using the add on ...
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2answers
75 views

DC Motor giving poor output waveform - how do I fix?

I am trying to make a DC motor controller with an H-bridge and PWM powered. The circuit diagram for the motor controller is: The inputs can obviously only be on 1 at a time to prevent short ...
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1answer
145 views

Full-Bridge Inverter

I'm building a Full-bridge inverter with input of up to 36V, Four IGBT are used for switching and embed micro controller for PWM. To drive IGBT I'm using four HCPL-3120 chips. After testing the ...
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2answers
166 views

H-bridge mosfets exploding

Something odd is happening in a h-bridge design I've made. Schematic: The part numbers in the picture are wrong, sorry. The n-channel mosfets (the bottom 3) are all 2N7002Ps, and the P-channel ...
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1answer
76 views

Driving a low current solenoid with a low voltage H-Bridge

I'm trying to drive a solenoid to create a magnetic field. I've got a constant current controller circuit that supplies the current I need, but I'd like to control this using an H-Bridge so the the ...
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272 views

Analysis about H bridge to drive DC Motor

the picture below shows my design about driving DC motor with H bridge. There is one problem, for example, I turn on the U1B and U1A(use PWM to turn on U1B and the U1A is always turn on when I make ...
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129 views

Low cost H-Bridge circuit for PWM

I try to design a (relatively) low cost H-Bridge on N channel MOSFETs. I need to drive 8.5A peltier device with 12V and (roughly) 20kHz PWM. (after reading some of the comments I changed this ...
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57 views

What voltage reference is the pwm signal using in the QUADRUPLE HALF-H DRIVER SN754410NE?

I have a QUADRUPLE HALF-H DRIVER SN754410NE, and i saw online that the 5V from the arduino goes to pin1, pin 9 and pine 16 and on pin 8 you attach a separate 5v supply that has at least or more than ...
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34 views

Will my potentiometer provide enough amperage for my h bridge?

I am sending pwm requests to my H-bridge from an arduino. Each pwm signal is a precise so I need to have the h bridge drive it by that specific amount. I want to use 5V for the h bridge supply, so i ...
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164 views

Diode parallel to resistor on H-Bridge MOSFETs gates

I was looking at a TC4467's gate driver datasheet and there is one thing there that I haven't seen before when reading about H-Bridges. On the schematic of example H-Bridge motor control there is a ...