Questions tagged [full-bridge]

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Full wave active rectification for lower voltages?

I have been following these youtube tutorials on active rectification to learn more about the topic. https://www.youtube.com/watch?v=VR456CsHYx4 https://www.youtube.com/watch?v=arvNukW-jeo I simulated ...
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How to fix LED fixture not turning off completely when the switch is off

I have LED ceiling lights that are not completely turning off even when the switch is off. Sometimes the brightness of the glow is just to much for me and finally decided to do something about it. ...
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116 views

Why is a capacitor connected across the power MOSFET in the DC-DC stage of most SMPSs?

In many of the schematics of the DC-DC stage of SMPSs, there is an external capacitor connected across the MOSFET switch (across drain and source). Why is this capacitor required? MOSFETs have an ...
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2 votes
1 answer
47 views

Testing of HF transformer designed for phase shift full bridge converter(PSFB)

I have designed an HF transformer for a PSFB converter. Specs: Peak Primary Voltage = 800 V Peak Secondary Voltage = 176 V Turns ratio Np:Ns = 18:4 Primary Irms current = 12.38 A Secondary rms ...
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143 views

Why Rectifier does not short circuit?

Why in a rectifier circuit the current does not go through the diodes marked with the question marks in the picture and create a short circuit when the current is returning from the negative side of ...
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40 views

How to generate sinusoidal signal using hybrid SPWM modulation in single phase inverter?

I understand there are bipolar, unipolar SPWM. Since the switching loss is quite high in these, there also exists a hybrid scheme where for half of the cycle the gates are either on or off reducing ...
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Issue with Single Phase to Single Phase Cyclo converter Circuit

I am new at this forum. I am trying to make a circuit for single phase to single-phase cyclo converter. Using Pic Micro Controller for Triggering Gate of Trails. Triac -> BT151 Optocoupler -> ...
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1 vote
1 answer
527 views

Difference between h-bridge, dual half bridge and quad half bridge

Note: I am beginner. I'm looking at motor drivers on this website Various motor drivers have different specification for output configuration, i.e. :h-bridge, half bridge, quad half bridge and PWM. I ...
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112 views

Full bridge inverter failing after given input voltage

For my master thesis, I am designing a wireless power transfer using magnetic resonance. For this purpose, I designed a full bridge inverter which is connected to an autotransformer whose output is ...
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1 answer
94 views

Lazy full-bridge PWM control

I'm playing with a full-bridge driver: Usually, you want to put an inverted PWM signal on IN1 and IN2 and take care of dead-time. While writing the code for MCU I tried a simpler pattern: put a PWM ...
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Control two DC brushed motors with two wires in common

I'm working on a retrofitting project. I need to control 3 DC brushed motors with full H-bridge drivers. In most scenarios the 3 motors have independent connections: simulate this circuit – ...
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Full-Bridge Mosfet Vds Waveform Problem

I'm trying to build a full-bridge dc-dc converter, PWM signals are ok but drain-source waveform has some problems. Here is drain-source waveform with a proper pwm signal on gate. Then I decided to ...
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3 answers
104 views

Flowing back of current from capacitor filter to full bridge rectifier

Context: Pg-485 of this pdf Now we shall discuss the role of capacitor in filtering. When the voltage across the capacitor is rising, it gets charged. If there is no external load, it remains charged ...
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69 views

Is there any way to reduce the miller effect on a mosfet bridge?

I got miller effect on a full bridge and I'm trying to get rid of it. Is there any way to reduce the miller effect on a mosfet bridge? I'm using opto drivers with bootstrap circuitry to drive.
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Full bridge inverter using IR2110 giving output in patches

I have made a full-bridge inverter using IR2110 IC. The MOSFETs used are IRF540n. The bootstrap capacitor is 4.7uf. The diodes used are 1N5819 high-frequency Schottky diodes. The operating frequency ...
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1 vote
2 answers
79 views

Full-bridge output doesn`t work as expected

I am making a half-bridge amplifier and successfully managed to amplify a sinusoidal wave (simulates a sound signal). When amplified it has almost 100V of amplitude. It has a inductor and a capacitor ...
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139 views

What type of 24 VDC to 730 V converter is this?

The circuit below converts 24V DC into 730V. The circuit looks like a flyback converter but from what I know with the full-bridge rectifier at the output it can't behave like a flyback. The feedback ...
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3 votes
1 answer
102 views

Can an H-bridge drive another bridge?

I'm using a low-frequency RFID IC that handles a bunch of the low-level signal decoding, but I'm hoping to get more range out of it. It has two TX pins (diagram below) that it describes as a "...
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408 views

For a full wave bridge rectifier, why does the oscilloscope does not show the rectified voltage in negative cycle?

I was trying to do a simple full bridge rectification. There is a strange problem. The oscilloscope does not show the rectified waveform in the negative cycle. The input is applied from a Keysight ...
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30 views

Isolated Type 3 Compensator

I'm trying to build a full bridge dc-dc converter and planning to apply a type 3 compensator(voltage mode). When I check the isolated feedback type 3, I've read some comments indicate that it's hard ...
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S domain transfer functions of full bridge inverter

I need to design an inverter circuit as in the schema. It is driven by the unipolar PWM method. I have a problem with the circuit. It would be great if anyone can help me. I want to get the s domain ...
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1 answer
106 views

What is the best number of PWM signals for Full-Bridge driving? (2 vs 4)

Full-Bridge resonant converter circuit: Each transistor (Mosfet) has its own driver (ISO5852S). I assumed that a full bridge could be controlled with two PWMs. ...
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1 answer
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Best positioning of snubber capacitors for Full-Bridge transistors

Two options for the location of snubber (film) capacitors. In the first circuit, both capacitors stand up to before the bridge. In the second variant, each capacitor stands next to the half-bridge. I ...
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1 vote
1 answer
125 views

Oscillation in Class D amp design

I am building a class d amp circuit with base design from Great Scott's Class D amp which is found here. I am trying to build and simulate the circuit in LTSpice with difference being I won't be using ...
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90 views

Single-phase thyristor full bridge rectifier vs three-phase thyristor full bridge rectifier

For Single-phase thyristor full bridge rectifier compared to a three-phase thyristor full bridge rectifier, with regards the input current harmonics, does the three- phase rectifier have an advantage ...
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2 votes
0 answers
793 views

1.7 MHz Full bridge driver circuit for mist maker validation

I'm building an ultrasonic mist maker that can support 10 ceramic discs with a resonant frequency of 1.7MHz. I found the following circuit online, unfortunately, I'm a beginner in circuit design and ...
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1 answer
220 views

How to determine if a load cell is quarter-bridge, half-bridge or full-bridge?

Im looking to purchase 4 disk type load cells for weighing applications but it doesn't mention what configuration it is in (quarter bridge, half bridge etc.) Is it safe to assume 2 wire load cells = ...
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Six-step (trapezoidal) BLDC motor driving strategy

It seems that a common driving strategy for such a motor is to use the 3 half-bridge topology depicted above, and use PWM to regulate speed and/or torque. At any given moment, two phases ("wires&...
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30 views

Xl4061 board problem

I am building an amp for 6th order subs which is based on two transformers which have around 25 VAC, and I am trying to rectify them for 2 subwoofer module filter boards (12-32vdc) and for two TDA7498....
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1 answer
353 views

H Bridge vs Half Bridge current sense

Are there any disadvantages in measuring H Bridge current only via 1 shunt resistor? Since it will be made by hand on a perf board the only disadvantage will be the possible longer wires that connect ...
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2 votes
0 answers
96 views

How to drive MOSFET switches in a cascaded hybrid modular multilevel converter using a half-bridge driver "IR2103S"

I am trying to drive the MOSFET switches in a cascaded hybrid modular multi-level converter as shown in Fig. 1. Fig. 2 is used here to simplify the circuit and to present the problem (let's focus on ...
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92 views

Pitfalls of using only two diodes in a "full wave rectifier"?

Scenario: I have a small signal from a Piezo element which I am amplifying using a fully differential amplifier. Thus, my gained output from this In-amp are "two" (sine) waves inverse of ...
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1 answer
3k views

How do you find the peak-to-peak ripple voltage of a full wave bridge rectifier?

The 32VRMS secondary of a transformer feeds a full wave rectifier and capacitor filter as shown in the circuit The peak-to-peak ripple of the output voltage of this circuit needs to be less than 1V ...
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1 answer
267 views

Calculation of switching transformer at 100kHz

I am not able to desgin transformer for switching frequency 100kHz. It´s easy to desgin usual transformer for 50 Hz. But I´m totaly out when comes to switching transformers. What material should I use?...
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1 answer
133 views

what does this bulb need to work properly in this circuit?

This is the circuit, before it was working, but not anymore. I have an identical circuit and its ulb still working. I don't know where is the problem. (https://i.stack.imgur.com/fPpZW.jpg)
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2 answers
133 views

Output Voltage Ripple Considerations

I'm working on a full bridge dc-dc converter, following the instructions on power supply cookbook. It has a 350V output and 2kW total power, 30kHz switching frequency I choose inductor current ripple ...
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1 vote
1 answer
38 views

What's the purpose of components in these mosfet driver

I see these double ended transformer drivers on many places, I know the working principles of these gate drive transformers but still don't have an idea about external components that I've marked with ...
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3 answers
274 views

How to run a DC device through 3 phase 400V AC mains?

So I need to put a wifi antenna on farmland, the issue is that the antenna needs 12V DC powered over Ethernet and the only power source nearby is a 3phase 400V AC one... So is there something like a ...
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1 answer
77 views

Why does the output voltage after full bridge drop so many?

recently I am researching the piezoelectric transducer (PET), which can convert the mechanical energy into electricity. And I found a strange phenomenon. I used the 10MΩ probe of oscilloscope to ...
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2 answers
137 views

How do I calculate the average voltage of this wave?

I need to calculate the average voltage of the wave below, the DC voltage is 120 V , the curve starts at 21.65 degrees and the peak voltage is 325.269 V. The solution is 221.3 V. This is from a ...
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1 answer
844 views

How to design this filter?

I've a full bridge dc-dc converter and I'm trying to understand it. It has 48V input and 400V output with 1600W rating, 30kHz switching frequency. At the input of this SMPS there's a filter ...
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3 votes
1 answer
205 views

How can I get rid of this distortion?

I'm trying to build a 16kHz single phase, full bridge PWM inverter, Vdc=380V, 2kVA rated. When I load the inverter a little bit, the output voltage waveform is looks like this: simulate this circuit ...
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1 vote
0 answers
279 views

Type 3 Compensation on Full Bridge DC-DC Converter with SG3525

I'm trying to build a 48V-400V full bridge dc-dc converter. I'm using sg3525 as pwm IC and trying to get isolated feedback from output and planing to do it with TL431. When I study on it people are ...
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0 votes
2 answers
490 views

LTspice transformer voltage course problems at low duty cycle

I am trying to simulate full bridge SMPS in LTspice where I can change the input voltage to the voltage regulator (LT317) by changing the pulse width of the PWM signal at the MOSFETs. Everything ...
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1 answer
500 views

Forward Voltage VF Max 1V does this mean that the full wave w10 bridge rectifier can only allow 1 volts via it

I want to use a full-wave bridge rectifier. My circuit needs 2 amps of current and operates at 12volts (12V @ 2A). I found this https://www.tanotis.com/products/vishay-2w01g-e4-51-bridge-rectifier-...
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0 answers
73 views

How do I calculate deformant and real power of this circuit?

I have this circuit, the load is RL: I need to calculate the apparent, real, reactive and deformant power assuming L is very large. Since L is very large that means Q= 0 var and Pload=~Uav*Iav and S=...
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2 votes
2 answers
4k views

Dead-time in Full Bridge Inverter (LTSpice Simulation)

I am trying to generate a dead time between two switching legs in the conventional full bridge inverter. However, by simply including the delay block for one pair of switches - just shifts the signal ...
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1 vote
2 answers
169 views

In a half-wave uncontrolled rectifier with RL load why does the voltage spike when current reaches 0A?

I understand that the inductor creates a negative voltage to oppose the change in current but I don't understand why the voltage spikes up instantly when the current reaches 0A.
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1 vote
2 answers
748 views

Capacitor in parallel with relay coil backfires on contacts

I've got a smoothing capacitor(2,2uF) C1 in parallel with relay coils inside a fullwave diode bridge. When the circuit is closed through contacts in pre-relay RLY1 it first gives me, almost everytime ...
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0 answers
74 views

How to validate an SMPS transformer?

From UCC28950 webench design data I have approached a vendor for making a transformer for Phase shifted Full Bridge DC -DC converter. Now before giving order to vendor, I want to gather data on how to ...
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