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.

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9
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4answers
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 ...
9
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1answer
532 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 ...
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3answers
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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 ...
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5answers
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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 ...
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3answers
7k 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 ...
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2answers
2k 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 ...
7
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1answer
612 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 ...
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4answers
973 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 ...
6
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3answers
203 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 ...
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3answers
6k 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 ...
5
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5answers
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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 ...
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3answers
704 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 ...
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3answers
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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 ...
5
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1answer
390 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: (1) How is the voltage ...
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6answers
2k 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 ...
4
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2answers
299 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?...
4
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3answers
137 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 ...
4
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2answers
1k 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 ...
3
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4answers
3k 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 ...
3
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4answers
6k 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) ...
3
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4answers
716 views

How to avoid voltage drop when using full bridge rectifier as reverse polarity protection

I found a couple of old bridge rectifiers. After reading some docs and tutorials about reverse polarity protection decided to give them a try. The problem is nobody offered a solution against the ...
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1answer
4k views

Diode Bridge in Simulator not behaving as expected

Hi I have a Diode Bridge as outlined in the image below. As you can see I am getting a negative voltage on one pair of diodes instead of this voltage being flipped to positive. Can you see anything ...
3
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2answers
287 views

Tesla free energy collector

I'm trying to see how this circuit works: This is taken from http://www.instructables.com/id/TESLA-FREE-ENERGY-COLLECTOR/. I tried the circuit with 1n4148 diode and I can see a voltage on the ...
3
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3answers
549 views

Reverse engineering a power supply characteristics

I have this schematics and the following information: connect the + of the multimeter to test point A and the ...
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3answers
2k views

Power Losses in a 3 phase rectifier

I'm trying to speck out a heat sink for a 3 phase rectifier. The rectifier consists of 3 individual rectifier blocks. I need a heat sink for each block. The rectifier is for a generator and all the ...
3
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3answers
1k 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 ...
3
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3answers
496 views

What terminals of bridge rectifier to use, if I want it to behave as a high-current diode?

I have a 12V power source that can deliver 25A (DC). I intend to use something around 15A .. 20A on a circuit that includes a diode. However, I can't find a diode that can handle that much current, ...
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2answers
379 views

Bridge rectifier - min. required protective resistor

Looking at the datasheet for a MYS80 bridge rectifier, at the bottom it states Min. required protective resistor is 8 ohm. I could not find much information about a protective resistor in regard to ...
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3answers
905 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 ...
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4answers
2k 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 ...
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4answers
6k views

Why bridge rectifiers are used in case of DC power supply.?

I was searching for 12v to 3.3v/5v DC voltage conversion. I found many schematics and the voltage regulators. But in most of the ...
2
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3answers
1k views

Location of diode bridge on transformer circuit?

I'm designing a full bridge rectifier that takes 110vAC to 4-16vDC for input into a 5v switching regulator. I opened a few 5v power supplies and they place the bridge on the high voltage side. Why ...
2
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2answers
2k views

Full wave diode bridge rectifier troubleshooting

I am trying to make a full wave diode bridge rectifier, as the title suggests. I have a 120-12vac transformer that I'm using to supply the circuit. However, whenever I measure the voltage across the ...
2
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2answers
369 views

Problem With Power Supply.?

I am using the following circuit to convert 230V AC into 12V and 3.3V DC.Here i am using a X rated capacitor instead of a transformer and i am taking 12V and 3.3V DC output from this circuit to power ...
2
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1answer
179 views

Can I use DC to run an AC device in some cases? [closed]

I think there may be devices specified to use alternating current (AC) which can run supplied with direct current (DC) instead. There are devices which depend on AC in some fundamental way, like a ...
2
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1answer
228 views

High current, low voltage capacitors

I'm putting together a high current (200A+), low voltage (<5v) rectifier circuit. I have sufficient bridge rectifiers, but to smooth out the waveform I need a strong enough capacitor bank. Besides ...
2
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2answers
808 views

How to estimate the maximum current provided by a transformer?

I have a transformer that outputs 14.3V (AC of course) and the current in short-circuit is about 13A (made a beautiful spark when I measured it :) ). Can I guesstimate from here what is the 'normal' ...
2
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1answer
2k views

What is the rectifier's role in this AC dimmer circuit?

Here is a typical AC dimmer circuit: http://www.eleccircuit.com/wp-content/uploads/2010/09/light-ac-dimmer-120watt.jpg I just came across another variant which uses a rectifier: http://www....
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1answer
415 views

In a simulator, outputing +/-5V peak AC through bridge rectifier then opamp buffer gives 5V DC output… software error or does this really happen?

In a circuit simulator I'm using it shows that if I run an AC voltage through a bridge rectifier and output that to a op amp buffer, the voltage at the input of the opamp (and hence the output) is the ...
2
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1answer
97 views

What can I use to supply 220V DC to this motor?

I have a small 220VDC motor I would like to drive via a speed controller, so I can continuously adjust the speed. I'm in Australia with 240V mains, and I also have an adjustable 0-220V AC controller. ...
2
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3answers
119 views

Heatsinking considerations for Common Cathode Rectifying Diode

I am using this as rectifying diode in full bridge configuration in one of my power supply designs. My questions are regarding heatsinking of the diodes. They are as follows: Do I need to use ...
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4answers
184 views

Paralleling output of multiple BLDC motors used as generators

First of all, I apologize for anything stupid I say as I am not yet well versed in the proper technical terms and schematics. I wish to use several identical BLDC motors that will be spun at the same ...
2
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1answer
184 views

Uncontrolled Bridge Rectifier

I am getting wrong answer for the above problem. My book says R should be 23ohms. Please guide me where I am doing the mistake.
2
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1answer
89 views

Are these max-capacitor ratings (for a bridge rectifier) too conservative?

I'm looking at the Diotec BxxC2300-1500 datasheet (where xx is the max RMS voltage), and I'm a little miffed by the following table, which I've not seen in other manufacturers' similar datasheets: It ...
2
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1answer
664 views

If you plug in a bridge rectifier directly to a power outlet, and touching one of the outputs, isn't it like touching live wire?

If you touch the output of the Full bridge Rectifier, and the circuit is powered directly from the city power, does it shock you with every positive wave of the 120ac? How about a half bridge ...
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2answers
513 views

Separating Phase and Neutral in AC?

I need determine if a cable is connected to a wall-socket (230V) on the other end with a timer in-between. 230VAC---TIMER---CABLE Depending on how the timer is ...
2
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1answer
1k views

Selecting rectifiers for a welding machine

I have a welding machine that has a rated output of 230 amps with the AC output. The DC output is 140 amps. I was a bit puzzled as to why this was, but from what I can tell they use a lower voltage ...
2
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1answer
72 views

Rectified current transformer output is asymmetric

I'm using a current transformer (CS4200V-01L) to measure the current in a half-bridge. I'm facing an issue where the signal out of the current transformer is asymmetric, almost as if the current ...
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0answers
578 views

What could have caused bridge rectifiers to fail?

Ok, so I have a pioneer surround sound that I was trying to fix because of one speaker had very low volume. What I changed was a resistor, its the exact same color stripes, but the size is a bit ...
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0answers
278 views

What's wrong with my input circuit? LTspice

I am designing my first power electronics board in LTspice to convert single phase AC to DC. This DC is fed to asymmetric bridge to drive an SR motor which is connected to a flywheel. This flywheel ...