# 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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### 3 Single Phase Full Bridge Rectifiers for 3 Phase Rectification

We are trying to get rectified output from a star connected 3-phase generator. Line to neutral voltage is 230Vrms. We have tested using a 4 diode full bridge rectifier between one phase and neutral to ...
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### What are the advantages of an eight diode 3 phase full bridge rectifier?

I'm replacing my car's alternator, and tearing the old one apart, as you do. The alternator is wired in a Y configuration with 8 diodes, 2 on the neutral point, and then the standard 2 on each of the ...
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### MOSFET rectifier is outputting a strange waveform at higher voltages

With the help of the people who commented on my last post, I finally got my MOSFET rectifier to work! Couldn't have done it without you! After some tests, I noticed that the waveform begins to get ...
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### How to figure out the optimal LED current for an optocoupler

I have a optocoupler PS817 that I plan to use for a zero-crossing detection circuit for mains 230 V AC. But I do not know how to size the resistance of R1 and R2 mainly because: I do not know what is ...
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### Three phase rectifier output current

I´m designing a three phase power transformer, and i´m having troubles with the choosing the current value. After the transformer, goes through a three phase bridge rectifier ( full wave and not ...
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### Polyphase full-bridge rectifier formula

I am learning circuit analysis/design as an hobby, and I came across this circuit schematic while practicing. The phase differences between AC sources are 120 degrees. I am using the three phase full-...
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### Bridge Rectifier Dimensioning for SMPS

I want to know how to dimension a bridge rectifier. As an example,in a SMPS, the bridge rectifier has repetitive peak current, up to 10A at rate of 100kHz, but in a small period of time, like a small ...
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### How to improve the capacitor dropper circuit?

I am new to electronics and I am trying to build an iontophoresis device which should give a output of current in mA. This is the first part , i.e, the rectifier. I am sure it is not efficient and ...
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### Bridge rectifier vs full wave rectifier with two diodes

I've been wondering why bridge rectifier provides better significance and is mostly taught everywhere in universities rather than a similar circuit that uses two diodes in parallel instead of four. ...
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### How can I connect multiple 8V AC inputs into one earthed probe?

I am trying to design circuitry to connect 4 separate float-less water level controllers into one probe. Each unit needs to confirm that there is water in the tank and if not, will shut down. Not all ...
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### An upgrade of a simple welder

I've been needing to get some welding projects done, but am reluctant to cough up \$800 or more for a TIG & stick combo welder. However, I have an old simple buzz box welder (basically an oversized ...
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i have to implement the following circuit which is an energy harvester circuit using simscape electrical. The description of the circuit is this one found on page 7 of the pdf at Finite element-based ...
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### Isolated digital input for large variable input voltage (12-240)

In industrial applications, relays are used to send the signal to other parts and machinery. They switch 24 DC and 220 AC on, off signal. Although there are plenty of circuits to read input signals, I ...
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### Function of capacitor on the output of a bridge rectifier

What is the function of capacitor C in this diagram?
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### Ground connections around bridge rectifier in flyback converter

I am designing a flyback converter and I am being told to make the ground net connections as shown in the image below. I think this is colossally dumb because it eliminates PRI and SEC isolation. I ...
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### What is a bridge rectifier doing in this TRIAC regulator?

Recently I purchased a TRIAC-based mains regulator and took a look inside. It's a very typical TRIAC regulator, except it contains a bridge rectifier (DB207S), the purpose of which is not clear to me ...
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### Are Bridge AC to DC Rectifiers using thyristors still considered Linear Rectifiers considering their switching mechanism of action?

While I tried not to make the title confusing, Whether if the question is about Non-Linear/Linear PSUs or just the Rectifier circuits, I believe This one covers both matters. Considering that the ...
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### 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 ...
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### Forward biasing of diode bridge in a discontinuous mode operation of a three phase buck-boost derived power factor corrected converter

In this paper, they said that during mode 1 the diode bridge is forward biased because the output capacitor voltage is greater than peak line to line voltage but during mode 2 they are forward biased. ...
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### 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 ...
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### Choosing filter capacitor and inductor for AC to DC rectifier

I am designing a three phase AC to DC rectifier. This DC output will be connected to a 6 IGBT bridge. That IGBT will be controlled using SVPWM technique to control a PMSM motor. What factors do I need ...
1 vote
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### Ways to charge a VERY LARGE capacitor in a 3-phase bridge rectifier circuit

I need to charge two 1500uF-450V capacitors off of a 3-phase 220Vrms-60Hz line using a very robust bridge rectifier (datasheet) as well as both capacitors datasheet (datasheet). Here's the simulation ...
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### Diodes bridge rectifier with center tapped transformer

I need help with this homework question I have trouble solving it. the thing I don't understand is that when the voltage is positive the only diodes that are active are D1 and D3 and I'm not able to ...
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### How to use measured values to obtain an experimental ripple factor for a full wave bridge rectifier with no filter

Hello this is my first post. This is my thought process: I can use the following equations to calculate the theoretical ripple factor for a full wave rectifier: Through simplifying, it can be ...
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### PIV in full wave bridge rectifier vs. full wave rectifier

I know that in a full wave rectifier the PIV of the diodes is 2*VP, whilst in a full wave bridge rectifier we have just Vp. It is also said that the bridge configuration is more suitable in ...
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### Why connect a 3-phase alternator's star-point to a rectifier bridge?

I noticed while troubleshooting a Denso alternator that the stator's star point was connected to the rectifier bridge. While probing with a multimeter, I think the schematic looks something like the ...
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### How can I calculate the peak to peak ripple voltage of a rectifier circuit with an LC filter?

What is the formula for finding the peak to peak AC ripple voltage across the load resistor for this LC full wave bridge rectifier circuit? The rectifier output is a pulsating DC voltage which has ...
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### 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 ...
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### Are there any extra steps I can take to prevent noise on the output of this circuit?

I made a rectifier/boost converter PCB board in order to power a USB type-C charge module. The USB charge module will solder into the output posts on top of my board. And, since the charge module ...
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### Phase on full wave bridge rectifier

I have a seemingly simple question: I have a full wave bridge rectifier that is connected to 220 VAC. When I stick a phase probe on it's (-) negative pole, I see it's light: And that's something I ...
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### Could I use a bridge rectifier with a capacitor to make a measurable DC voltage to measure the output of the detector coil in an NMR?

I'm making an nuclear magnetic resonance (NMR) detector. I'm wondering if I could use an bridge rectifier along with an capacitor to smooth out the output to DC. Then I could measure it with an ...
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### Issues with a full bridge rectifier, receiving output approximately half of the expected output

I have receiver circuit for a wireless power transfer circuit. I have connected the circuit as shown in the image below. The circuit has a full bridge rectifier (DBS103S-T) which is then followed by a ...
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### 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 ...
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### 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 ...
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### Charging an 18650 Li-Ion cell via a bicycle hub dynamo

I'm interested in building a buffer battery for a 12V GPS tracker using a single 18650 Li-Ion cell. It will be mounted on a bicycle and unfortunately I haven't found a design for a tracker including ...
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### ZVS circuit to generate high DC voltage

I'm trying to design a high DC voltage generator to create a voltage differential between the upper and the lower part of a cloud chamber I'm building. I'm trying to use a ZVS circuit to amplify an ...
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### 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 ...
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### 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 ...
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### How can I properly measure the output of a full wave rectifier using an oscilloscope and a function generator?

I would like to measure the output signal from a full wave rectifier in a proper way using an oscilloscope. The sine wave comes from the function generator and is 10 Vpp. Both devices are mains ...
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### MOSFET TO-220 heat sink pad is electrically connected to drain. Can I solder wire or trace directly onto heat pad, instead of drain pin?

I have a board-layout where a lot of things would be easier if I could solder to the metal-pad of the TO-220 N-channel MOSFET, instead of the drain pin. Apart from: "Metal pad was intended for ...
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### Maximum load capacitance and rating for fusing for bridge rectifier

I'm looking for a replacement for an old bridge rectifier and I've found one (Vishay B80C1500G), but I'm curious about two parameters of the bridge rectifier: Maximum load capacitance Rating for ...
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### Full-bridge rectifier is not working

I tried to copy the full-bridge rectifier circuit diagram but for some reason it's not working. I think the current is not flowing from the high-voltage circuit device because I tried to hook up a ...
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### 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 ...
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### Half Bridge SMPS design

I'm trying to design a half-bridge SMPS. However not able to get the desired output. My doubt lies in the transformer sizing and it's implementation in LTspice. Specs: Vs=220 V RMS AC Desired DC ...
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### Double Valued Voltage in Rectifier with Capacitor Filter

When a capacitor is charged in a full wave rectifier, as shown below, the load voltage closely follows the AC input voltage, less some 0.7V. When the input voltage falls from its peak, the voltage ...
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### My diode bridge rectifier circuit in LTspice does not work properly

I am trying to make a model of a diode bridge rectifier in LTspice (it has to be connected to a transformer as it's part of a larger project). I have tested the transformer and the rectifier ...
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### 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 ...
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### 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 ...
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