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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+-10v input motor driver

I have a servo controller that outputs a +-10v velocity command for a motor. how can i take this signal and turn it into a pair of PWM outputs to drive an H-bridge? a value of 0 to 10v will control ...
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4answers
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Why does my MIC4605 keep blowing up?

I'm trying do design a mini-PCB, replacable half-bridge for motor control applications. The primary application is to use it with my modular inverter/BLDC/BDC controller. The controller design assumes ...
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5answers
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Electromagnetic 7-segment flip display: H-Bridge alternatives?

I have an electromagnetic 7-segment flip display which has 28 electromagnets for 4 digits. They run on 20V, have a 7.5W power rating and need alternate polarity applied to switch between the 'on' and ...
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52 views

What does zero voltage or negative current mean in H-bridges?

I have looked around in the internet, but could not understand what does zero voltage negative current or ...
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2answers
86 views

Op amp only getting Half wave output on Dual Power supply [closed]

In my project I'm putting together a H bridge circuit which uses the N Channel type MOSFETS only and it is controlled by my amplified arduino square wave signal that is operating the MOSFET Gates ...
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2answers
71 views

Motor stall detector with a voltage divider in parallel to the motor and ADC: it does not work as expected

I'm trying to replicate a motor stall detector I found on a PCB of a commercial device (chinese). This is the schematic: I'm using an ESP8266, resistors with same value as in schematic, two MMBT3906 ...
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79 views

IR2110 MOSFET drivers burning

I am currently building an H-bridge for my Tesla coil with this video as reference: H bridge. The only thing I changed was that I swapped the pull-up to pull-down resistors and I am using IRFZ44N and ...
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1answer
40 views

Is it nessesary to use PWM pin on LMD18200

I'm creating the circuit which has to apply direct and inverse voltage to the load and I want to use LMD18200. According to it's truth table, if I connect PWM to logic ...
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1answer
42 views

L6202 H-bridge keeps breaking when switching directions

I chose to use the L6202 H-bridge IC because it has built in dead time as well a thermal shutdown protection. However I've already broken multiple of these from what appears to be current spikes when ...
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2answers
47 views

How to determine which motors give me faster acceleration to a speed?

I have two motors for one system, assume that I do not allow to do experiment to fund the answer. One of them is http://www.servocomponents.com/Pittman-Brush-Motor-14000-series/14207s008-SP The ...
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16 views

Recover control signals from h-bridge output

I have a board with a H-bridge output: ±24V @ 1A maximum. I'm asked to make a more powerful driver, with higher voltage, without changing anything in the existing circuit. The good news is the ...
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1answer
49 views

DC to AC inverter (full h bridge) with single pwm channel

I have only one PWM channel. but I have found PWM and inverted PWM signal is required to run the full H bridge to convert DC to AC. a square AC signal is more than enough for my application is it ...
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How to use one H-bridge to control multiple latching solenoid irrigation valves?

I'm using Arduino Uno to operate a latching solenoid irrigation valve by using an H-Bridge to set the polarity of the 12V DC going to the valve. A 500 ms + pulse on a digital output pin turns the ...
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1answer
110 views

H-Bridge Gates Stuck On

I've developed an automotive H-Bridge circuit using the DRV8702-Q1. It's pretty close to the reference schematic in the datasheet but it doesn't work. I've been racking my brain for ideas as to what ...
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Combining h-bridge reservoir capacitors

I am building a circuit that, among other things, will run both a 3A brushed DC motor (using a full h-bridge, PWM, probably TLE9201) and a 10A brushless DC motor (using three half-h-bridges, PWM, ...
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69 views

FET-based H-Bridge for bi-color LED

I've got a bi-color LED in a push-button that is red when powered in one direction and green in the other direction. I would like to control it from a Raspberry Pi GPIO pin, e.g. High=Red, Low=Green. ...
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88 views

Reduce minimum operating voltage of an H-bridge

I have purchased the following H-bridge and I'm controlling it with a microcontroller: https://www.amazon.com/H-Bridge-Brakes-Forward-Reverse-Full-Duty/dp/B07GFFVZKS My problem is that the MOSFETs ...
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2answers
52 views

Voltage divider in parallel with DC motor driven by H-Bridge: can someone explain me this circuit?

I have a battery powered device with a PCB wich control a small DC motor (3V). With a little bit of "reverse engineering" I darw this schematic: So there's an 8-bit IC (STM8L052C6) that drive the ...
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1answer
62 views

How to get right voltage output with Bts7960b H-Bridge?

I am using a NodeMCU to control a BTS7960b motor driver. (datasheet of the BTS7960) This driver controls a 12v dc motor. This image shows my wiring (without the display and the buttons and with a ...
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67 views

Half H-Bridge Control

I need to control a Half H-Bridge circuit to move a DC motor on both clkwise and ctrclkwise directions. I've tested the following circuit: It worked as it was supposed to: when the digital input ...
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2answers
214 views

Half H-Bridge Driver

I'm working on a project to control power sideview mirrors in a car, with features like TildDown, that tilts some of the mirror down helping to park. The circuit is pretty simple, but I'm having some ...
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1answer
66 views

Can I use an h-bridge as a changeover circuit?

I have solar controller which outputs battery voltage when available. I also have a switching psu as backup. What I would like to do: Use an h-bridge, connecting its battery negative terminal to my ...
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3answers
108 views

MOSFET High Side conducts when low side switches in H bridge circuit

I have designed an H-bridge circuit using IR4110 Mosfets. Q1 and Q4 are OFF, Q2 and Q3 are conducting. Gate of Q1 is left floating. Q2 being high side, its gate is connected to Vcc + 12V. The gate of ...
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46 views

How can I connect a Peltier Element?

I need help to anyone who can help me 🙂 A peltier can be reversed. So If I supply + to RED and - to BLACK it works as expected. But if I reverse the polarity, ( - to RED, + to BLACK), it will also ...
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1answer
48 views

Driving ULN2064 with 74HC595 for 12V motor loads

I've made a circuit with ( Arduino + 74HC595 + ULN2803 ) to drive 20 hobby motors using 12V 10A Supply. Initially It Looks Good, But when i started running one motor, Motor running too slowly and ...
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1answer
104 views

H-bridge, LED driver, DAC

I am trying to interface a circuit with an FPGA. There is an H-bridge in the circuit that is driving me crazy. The inverted RED and IR signals are coming from FPGA. The light intensity signals are ...
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1answer
57 views

How to measure current to detect motor stall on H-Bridge driven motor?

I have DC motor with a gearbox to transforms the rotational movement to linear movement and movie a pin back and forward. I need to know when the pin reaches the two positions: full back or full ...
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3answers
60 views

Full-bridge or half-bridge for a DC motor

So I have a DC motor which draws around 16A at 12V. I want to have some room to play with in the top values. I need to control the spinnig direction as well as speed. I understand how half-bridges ...
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1answer
73 views

Can I share charge pumps between multiple L6206 H-Bridge drivers?

I'm building a board to drive 8 separate motors, and I'm planning to use four L6206 dual full H-Bridge drivers. The device uses N-channel MOSFETS all round and, from the datasheet: Using N-channel ...
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1answer
71 views

Review inverter design: why are there no short circuits?

I made my first inverter design and I got a lot of help from this website. But I want to get your suggestions before something goes wrong. Circuit output is 12V AC 72Hz square wave. I used NE555 as ...
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83 views

IR2101pbf Multisim simulation problem

I am trying to drive 2 MOSFETs (high and low configuration) to drive a 10 ohm load and there are 2 problems I am facing. When putting both HIN and LIN pins to 12V (High), the output is around 7 Volts ...
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1answer
191 views

Why this H-bridge with only N-channel FETs didn't work?

Based on this answer here in StackExchange and the Motorola article it cites, I've designed a dual h-bridge motor driver with push-pull transistors to switch the FETs faster, layed out a PCB in KiCad ...
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1answer
264 views

IR2184 Driver Failure

I'm working on designing a half H-bridge circuit around an IR2184 Mosfet driver chip. I've had limited success with it. Ideally it will allow me to drive a 12V/4A bilge fan when I get it working. One ...
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21 views

How to identify if a sensor gives a half bridge or full bridge excitation?

I'm not sure whether this pressure sensor gives a half-bridge or full-bridge excitation? Link to sensor: http://www.southeastern-automation.com/PDF/GESensing/Pressure/5000%20Series.pdf The one I'm ...
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2answers
56 views

Half Bridge Low Side Mosfet vs. Flyback Diode

I intend to use this high side switch in a PWM application with a brushed 12V motor drawing 8A steady state max: https://www.nxp.com/docs/en/data-sheet/MC33981.pdf The switch allows for a half bridge ...
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64 views

Bi-directional constant current using analog switch

I am trying to build a bi-directional constant current source with a h-bridge configuration. As you can see in the attached figure, I am controlling the direction of current on the load using PWM ...
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3answers
226 views

How to bias BJT base voltage in a push pull amplifier AND control current gain

I am building a motor driver and using the push-pull arrangement shown. I need the output signal to be +/- 30V so each 'side' should be +/-15 and are balanced. Cutting to the chase I can't get my ...
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1answer
97 views

H bridge inverter

I am trying out an H-Bridge inverter using GaN FETs at 140 kHz. The schematic is as follows. (In the experimental prototype, I used TI's LMG5200 and the load is connected via a full-bridge rectifier. ...
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1answer
81 views

Transformer and MOSFET combination not working

I am working to understand the circuit of a vibrating needle used in factories to scratch a mark on a soft surface. Essentially, this circuit drives a MOSFET bridge which then drives a Transformer. ...
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3answers
819 views

What does the output current rating from an H-Bridge's datasheet really mean?

I bought the H-Bridge VNH7070BAS from ST because it would drive up to 15A, but when I test it, it only reaches 6A and then it shuts down. What does that value really mean? How can I get the output ...
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68 views

ST VNH7070 current sense specification

I don't understand the way ST specifies their current sense pin in the VNH7070 H-bridge motor driver, see the datasheet below. How do I know what the current Isense will be? Why does the voltage ...
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1answer
101 views

H-bridge topology question

Hello. I want to inquire the method that describes when, one side is ON/OFF(fig.17.b), and the other goes with PWM. The point is, wheather both of mosfets (high & low side) will be on/off and some ...
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1answer
47 views

L293E, voltage difference exists between output 1 and output 4, yet it can't drive a small motor

I'm using L293E to drive one motor in two direction. Output 1 and output 4 are connected to the motor and I alternate Input 1 (1A) and Input 4 (4A) between VCC and GND. (never input1 == input4). Vs ...
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69 views

Arduino reboot with DIY H-bridge Controller

Here is my already tested and working schematic of the DIR +PWM mode DIY H-bridge on DPDT relay with IRLB-3034 N-channel MOSFET with opto isolation from the controller, and some "quick gate" driver ...
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4answers
173 views

H-bridge with optocouplers input not smooth

With commonly used bridge schematics, the operation with optocouplers are like on and off, like without smooth transitions under PWM. If opto with additional 10-12volts to gates via them, are excluded,...
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3answers
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Driving stepper motor with H-Bridge, how many Volts?

I know that stepper motors are usually driven with current-limiting chopper drivers and hence the applied voltage doesn't really matter (or does it?) and that's why specs of stepper motors don't state ...
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2answers
154 views

Drive H-Bridge using analog signal instead of pwm? [closed]

Is it possible to drive an H-Bridge like the L298n using actual analog signals rather than digital PWM signals? If not, what would be the equivalent to an H-Bridge that allows for this?
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138 views

H bridge using DPDT relay

I have a DPDT relay and I would like to create a H-bridge. How do I implement a H-bridge with a DPDT relay?
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72 views

Forward diode characteristics not starting from zero Ampere

Why the current is not starting from zero, whats the diode characteristic when current is near zero? Reading the datasheet for N-channel 60V MOSFET, I encountered this source-drain characteristic of ...
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0answers
91 views

L6203 motor driver with high Rds(on)

The L6203 states that it typically has and Rds(on) of about 0.3 ohm. After implementing the circuit below, I'm measuring a significant voltage drop across the transistors when the motor is stalled (or ...