Questions tagged [bridge-rectifier]

An arrangement of four or more diodes in a bridge circuit configuration which provides the same output polarity for either input polarity. It is used for converting an alternating current (AC) input into a direct current (DC) output.

Filter by
Sorted by
Tagged with
26 votes
5 answers
2k views

Can two BJT transistors work as a full bridge rectifier?

It is known that a BJT transistor looks like two diodes back to back (or head to head). With this in mind, theoretically we should be able to build a full bridge rectifier with 2 BJT transistors, one ...
virolino's user avatar
  • 449
12 votes
5 answers
2k views

Why is this rectifier bridge using double diodes? [duplicate]

While reading some old (paper) books, I found this as an example but without further explanation: Why does it use double diodes? I don't see anything about this elsewhere. Does this increase the ...
Aram Alvarez's user avatar
11 votes
2 answers
1k views

LTspice diode bridge rectifier input oscillating

I've made a LTspice model of a diode bridge rectifier, but when I simulate my circuit, the input voltage is oscillating. Here is my schematic, along with the simulation result of the voltage at node 3 ...
Ana Ćupurdija's user avatar
11 votes
3 answers
15k views

Bridge rectifier: 4 diodes vs. single chip?

I notice (among the DIY audio enthusiasts at least) that when it comes time to design a power supply for an amplifier, DAC or whatever that the parts list will inevitably include something like "4 x ...
abza's user avatar
  • 664
10 votes
6 answers
2k views

Bridge rectifier: What is the purpose of these two elements?

I found the following circuit in a random video (don't know what it's worth) and have two questions about it. I get that it's a full wave rectifier, and I think I have a decent idea on how it works. ...
aherve's user avatar
  • 225
9 votes
4 answers
3k views

Installing heatsink on a bridge rectifier: which side of the rectifier should it be installed on?

I'm going to install a heatsink on a KBU810 bridge rectifier. As the picture shows, the leads are closer the face with markings on it. I wonder if one of the two faces is the preferred site for ...
apadana's user avatar
  • 1,032
9 votes
4 answers
3k views

Will my circuit charge the battery and power Arduino?

I am currently attending High School, so I don't expect too much here. I simply want to know all the recommendations for this circuit (Capacitor values, etc). But I mainly want to know if this ...
Nathan Johnson's user avatar
9 votes
1 answer
1k views

Why does a full-wave bridge rectifier have noisy output with no load?

Purely academic question: I have a little bridge rectifier made out of four 1N4001 diodes, being fed by a transformer putting out 12VAC. When I run it without anything else attached to it, the ...
danavee's user avatar
  • 155
9 votes
1 answer
2k views

Bridge rectifier outputting 338 volts DC with 120 volts AC input

I am measuring the live voltages right now and am seeing these numbers. I thought 338 volts DC was the result of rectifying 240 volt AC? I understand that 120 volts AC is the Vrms reading and that ...
56he65h's user avatar
  • 103
8 votes
3 answers
3k views

diodes blow with no load on full wave bridge rectifier

I have built what I thought is a simple first stage for a power supply consisting of only the full wave bridge rectifier (made up of individual 3A SMD diodes) and bulk capacitance. The moment I apply ...
Gineer's user avatar
  • 456
8 votes
5 answers
1k views

What is the name and purpose of the following component?

I'm trying to repair a small electronic door bell. I was wondering what is the name and purpose of the white box component ? It seems to be just a wire with some white body around. Is it a resistor ...
tigrou's user avatar
  • 1,893
8 votes
2 answers
4k views

Can somebody explain why normal diode(1N4001 or 1N4007) is used in rectifier bridge insteed of schottky diode

I have 9v AC(1A, 50Hz) as input to 5v DC(500mA) as output rectifier circuit to power up the development board. But I had a doubt if I use Schottky diode instead of normal diode what happens to the ...
KARTHICK's user avatar
  • 101
7 votes
4 answers
11k views

Schottky barrier diode as a bridge rectifier?

I am building a linear power supply. I need a bridge rectifier and the diodes I currently have can only handle up to a maximum of 1 amp, but I need 4-5 amps. But I have a bunch of YG862C15R Schottky ...
Xane's user avatar
  • 483
7 votes
1 answer
3k views

What is the function of these extra capacitors around the bridge rectifier?

I'm looking at different bridge rectifier circuits and found this one. Capacitors C5-C8 are smoothing capacitors. Both positive DC and negative DC have capacitors C1-C4 linking to both AC lines. What ...
Ashton Snelgrove's user avatar
6 votes
2 answers
2k views

What are these four diodes doing?

I am working with a MC33186DH1 5A H-bridge IC. It seems to simplify things quite a lot. The data sheet shows this simple schematic: I found a break out board that mostly follows that design: My ...
AndrewT's user avatar
  • 263
6 votes
4 answers
2k views

Converting 8V AC to 8V DC - bridge rectifier gets very hot while idling

I am tinkering with an Arduino and recently had to convert 8V AC to 5V DC in order to run it. The project is a custom doorbell, which gets the power from the doorbell transformer (transformer is ...
Maximilian Wiens's user avatar
6 votes
3 answers
2k views

Why AC supply is rectified first before stepping voltage down?

I have opened one of my phone chargers and was trying to understand how it works.. I found IC MB6F just at AC input which came out to be a bridge rectifier. My question is why AC is first rectified ...
Wupadrasta Santosh's user avatar
6 votes
3 answers
856 views

Converting a sprinkler system's 24V AC outputs to 3.3V DC logic inputs

I am working on a system that can detect which of the AC outputs on a sprinkler box is on and for how long. The sprinkler box has one common wire and then 18 connections that output 24V to open ...
Parker owen's user avatar
6 votes
2 answers
6k views

How do you calculate RC snubber values for a discrete bridge rectifier

I'm working on a small linear power supply for an audio amplifier (home/hobby use) and I want to add an RC snubber on the rectifier diodes. I know this might be overkill, but I'm looking at it as an ...
CatalinM's user avatar
  • 387
5 votes
5 answers
9k views

What happens if you feed DC into a bridge rectifier?

If I feed DC into a bridge rectifier, it still outputs DC right? Also, it seems like it should provide make the inputs DC polarity agnostic, right? I'm asking because a friend has a programable timer/...
kbyrd's user avatar
  • 243
5 votes
4 answers
811 views

Is the RMS value the same after you pass it through a full wave bridge rectifer?

Is the RMS value the same after you pass it through a full wave bridge rectifier? That is if the value was 230VAC (RMS) before the rectifier will it still be so after the rectifier? (ignoring any loss ...
aaq's user avatar
  • 131
5 votes
2 answers
1k views

Why is this voltage tripler actually quintupling?

Today I was experimenting with voltage doublers and tripler for a hobby project demanding a voltage I can't directly pull from the transformer I have. The following measurements confuse me: I was ...
Aram Alvarez's user avatar
5 votes
3 answers
787 views

Bridge rectifier speed

I pulled an old computer power supply apart and salvaged a bunch of parts. One of them is a GBU806 bridge rectifier. Wanting to learn about these things and play with my new toys, I hooked up a signal ...
LarryBud's user avatar
  • 459
5 votes
3 answers
438 views

Bridge rectifier circuit with a step-up transformer

I have been experimenting with a full-wave bridge rectifier in LTspice. I am trying to step up 120 V AC/60 Hz to 1 kV DC for a load of around 2 kΩ. The step-up transformer has a ratio of 25:9. The ...
Dimitar Zhekov's user avatar
5 votes
3 answers
1k views

Double Bridge-Rectifier Circuit Question

I am up to building a NE555 controlled PWM circuit that will power a 220v heater. NE555 will use a typical configuration and will drive a 20N60 Mosfet. The mosfet Vgs(th) is 10v, so NE555 needs to be ...
Jimmy Falcon's user avatar
5 votes
4 answers
7k views

Can I use a resistor before a bridge rectifier to lower inrush current?

I have been looking for ways to limit inrush current in a power supply circuit I am designing. In LTspice, with no current limiting, I see a spike of around 24A before my caps are charged. Looking ...
samoz's user avatar
  • 1,191
5 votes
3 answers
6k views

Why am I getting a half-wave rectified output when i am using a full-wave rectifier?

I have recently gotten back into electronics and have access to a lab with a signal generator and oscilloscope. I have been trying to teach myself how to use this equipment by building small and ...
James85's user avatar
  • 51
5 votes
4 answers
2k views

Why Does DC Load Draw Twice As Much AC Current Through Transformer?

I have designed the following circuit, comprised of 4 loads, 1 of 4.2ohms and 3 of 21ohms, drawing a total of 2.4Arms (1.5A, 300mA, 300mA and 300mA respectively) of AC current through the secondary of ...
Raz's user avatar
  • 175
5 votes
3 answers
5k views

Storing the charge from a MOSFET Bridge Rectifier

I am using the following MOSFET Bridge to harvest AC bursts, that come from an electromagnetic transducer. In front of this circuit is a supercapacitor I have added. I read the following on a ...
Denis's user avatar
  • 1,265
5 votes
2 answers
6k views

Designing MOSFET bridge rectifiers for high voltages

I've been looking into MOSFET bridge rectifiers, also known as "zero IQ" rectifiers, as a replacement for traditional diode-based bridge rectifiers. Here's a simple example: The benefit, of course, ...
Polynomial's user avatar
  • 10.7k
5 votes
4 answers
1k views

Bridge rectifier low voltage

Power supply for headphone tube amp gives me 10-12V lower voltage comparing to the schematic (my measurements are in red for amp under load). Current under load is about 70 mA. Using simple formula : ...
buggy08's user avatar
  • 51
5 votes
2 answers
891 views

How is the voltage regulator functioning in this vintage charging circuit?

Attached is a simplified diagram of my motorcycle's charging circuit. It has a standard 3-phase bridge rectifier circuit--simple enough. I'm confused about two things: How is the voltage regulator ...
mccquillr's user avatar
4 votes
6 answers
1k views

Is full wave rectified AC, without a smoothing capacitor, okay for switching a DC solenoid and a DC relay?

I have a circuit where the 24V AC secondary voltage of a transformer is full wave rectified to DC. The only parts that this circuit is connected are some 24VDC solenoids and a 24VDC relay. The ...
Rodrigo's user avatar
  • 471
4 votes
3 answers
1k views

Parallel diodes in a single package - is it really double current rating?

As an example: https://www.onsemi.com/pdf/datasheet/mbrb20100ct-d.pdf I've seen discussion where it says diodes in parallel may not increase the current capacity. BUT the datasheet clearly says it's ...
mrjayviper's user avatar
4 votes
7 answers
3k views

Bridge Rectifier Fails When AC Inputs are Shorted

I am working on a design that involves powering a 3.3V microcontroller off a doorbell transformer but I am running into an issue with the bridge rectifier failing when the AC inputs to the rectifier ...
user avatar
4 votes
3 answers
899 views

How does this negative voltage rail work?

Rod Elliot has a dual bench power supply project on his web site (project 223, see schematic below). I'm trying to understand his method for adding a low voltage negative rail without using an ...
RobT's user avatar
  • 115
4 votes
3 answers
356 views

Weird rectifier attenuation or bad probing?

I am looking at a full bridge rectifier from mains voltage, using MD5S-W. First, I build my circuit for use at 20V AC for safety reasons. I used this adapter: And this is my circuit: simulate this ...
Christianidis Vasilis's user avatar
4 votes
2 answers
890 views

Why does diode keep conducting even after voltage across it is negative

consider single phase two pulse semiconverter asymmetric configuration. simulate this circuit – Schematic created using CircuitLab Note the high value of inductance L1. Let ...
jeea's user avatar
  • 177
4 votes
2 answers
510 views

Differences Between Smoothed DC & Not Smoothed DC With Respect to Heating

Are there any significant differences with respect to heat generation of a bridge rectified circuit with smoothed DC by use of a capacitor vs one that just uses the raw absolute value of the sine wave?...
Sarah Szabo's user avatar
4 votes
1 answer
135 views

Is this supposed to be the output of this circuit?

I used LTspice to simulate a oscillator circuit to convert DC to AC. The oscillator is then connected to a class AB power amplifier to increase the circuit current. The load of the Class AB amplifier ...
Jeremy's user avatar
  • 51
4 votes
3 answers
168 views

Given the diagram, where do I add/replace a larger capacitor for continued power while bike is stopped?

Following the circuit diagram, included as an image in this guide, where do I replace/add a larger capacitor for continued power while the bike is stopped? My guess is that it should replace the ...
radicalbiscuit's user avatar
4 votes
1 answer
3k views

Use RMS or peak value of current for transformer selection

I'm going to make 12V DC power source for my project, using a transformer (230V AC to 15V AC) and full wave bridge rectifier, followed by LM7812. The load will be 200mA DC. This is the simulation ...
Chupacabras's user avatar
  • 5,445
4 votes
3 answers
1k views

Use of different diodes in a bridge rectifier

I'm repairing the circuit for a motion-activated LED light. The PCB uses a capacitive dropper circuit as the power supply. Photos of the PCB and the corresponding reverse-engineered power schematic ...
Amr Bekhit's user avatar
  • 1,298
3 votes
4 answers
4k views

What seems to be the issue with this simple diode bridge rectifier with smooth capacitor?

I don't know if it is some limitation on the simulator, or my mistake, but I am trying to build this circuit: But this is what I get: For some reason, the voltage at the marker ...
nemewsys's user avatar
  • 471
3 votes
5 answers
2k views

Can a diode bridge be connected to a high input voltage?

I'm trying to rectify an AC current at 220V. Many written tutorials don't mention any transformer before the diode bridge and many video tutorials use transformers that provide an output of 6V or more....
Ilyes Ferchiou's user avatar
3 votes
4 answers
8k views

Problem with capacitor after bridge rectifier

I wanted to make a simple power supply so I made a bridge rectifier with 4 diodes rated 6 amps, then I connected the bridge to a transformer (220 volts to 9 volts (measured 9.4 with voltmeter) 50 Hz) ...
OM222O's user avatar
  • 55
3 votes
3 answers
1k views

Transformer is not essential in half wave rectifier

My textbook for basic electronics states that Transformer is not essential in half wave rectifier (advantage of half wave rectifier)... But why? And there's another statement saying that half wave ...
user avatar
3 votes
4 answers
6k views

Rectifier for two phases (220 V 50 Hz)

I have a switch circuit which works with two phases. I need a flyback SMPS power supply for my logic circuit. I want my control circuit to be alive if any or both phases are receiving power. This can ...
Whiskeyjack's user avatar
  • 8,286
3 votes
2 answers
51k views

How to calculate voltage after rectifier?

Well, my question is: "Is this calculator wrong?" It calculates the voltage after rectifier as Vdc = Vac * 1.41 It seems it forgets the voltage drop on diodes (0.7V + 0.7V). Is the site ...
IceCold's user avatar
  • 836
3 votes
2 answers
2k views

Why is an input side transformer necessary with a bridge rectifier?

I am not getting the statement "The load cannot be grounded without an input side transformer." Described as a disadvantage of bridge rectifiers in book on power electronics by M. H Rashid. Why can'...
Sohail Ahmed's user avatar

1
2 3 4 5
9