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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1answer
925 views

How can I power a NodeMCU from a 12VAC building intercom?

Original situation I live in an apartment with a 12VAC intercom/open button for the street door. Current situation I've wired a normally-open relay, linked to a NodeMCU, across the terminals for the ...
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61 views

Commutation overlap symmetry

Let's say we have three phase diode (ignore SCR in the picture) rectifier: With no source inductance, diodes are conducting at following angles: Diode 1: 30º < X < 150º Diode 4: 210º < X &...
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1answer
876 views

Powering a motor through wireless electricity [closed]

simulate this circuit – Schematic created using CircuitLab simulate this circuit Schematic redrawn by Transistor. OP to edit or delete as required. I have a wireless electricity transmission ...
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1answer
4k views

Commutation overlap angle

Let's assume we have three-phase diode (not SCR, ignore those in the picture) rectifier like in the picture: Assuming we have no source inductance and other ideal conditions, diodes from 1 to 6 are ...
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1answer
550 views

is it ok to power a 90v dc motor with 170v dc and pwm?

I need to control a 90v dc motor, the thing is that I dont have a way to get a 90v suply so I just rectified the ac voltage and got 170 volts, without any load and filter caps, as far as I know this ...
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1answer
241 views

Main switch circuit with thyristor and bridge problem

Following circuit is a 220V touch switch from this website: http://8085projects.info/m668-based-touch-sensitive-step-dimmer-circuit.html I'm wondering how it works because the IC take its working ...
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2answers
1k views

How to determine which bridge rectifier to use

I tried searching and couldn't find how to determine how to decide which bridge rectifier to use in a circuit (assuming you know load). is the only consideration that the rating exceed to voltage and ...
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2answers
4k views

AC Current Sensing Switch Using Current Transformer

I'm struggling to design a circuit that will interpret signals from a SCT013 current transformer and trigger a constant 5v signal (which will go to a microcontroller) when a certain current threshold ...
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1answer
127 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 ...
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67 views

Capacitive-load derating for bridge rectifier

I'm confused about the precise meaning of the derating info/graph for capacitive loads for the Visahy 2KBPxxM-M4. I get it that the current rating for capacitive loads is less than for resistive/...
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1answer
2k views

Importance of series resistor at output of Rectifier

For conversion of AC into pulsating DC we used Rectifiers circuits. But I read somewhere (from a well-known site) that the circuit does not work in ideal condition if I used my first circuit. The ...
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1answer
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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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1answer
45 views

inverter to rectifier [closed]

I'm putting together an experimental geo resistivity measuring device following vague instructions found on the internet. I was wondering if it is safe to connect a Mastervolt AC MASTER 12/500 ...
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3answers
463 views

Elevated voltage after a filtering capacitor

When the secondary coil of a power transformer provides 44V to each side of a bridge rectifier relative to the ground, i.e. 88V total, and I measure +53V and -63V after the rectifier on the filtering ...
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Average output voltage of single-phase thyristor-controlled bridge converter

This question is highly related to this one but I don't find the answers satisfying. I'm a bit confused about the equation for the DC output voltage of phase-controlled bridge rectifiers. \$V_{o_{...
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2answers
3k views

Replacing the selenium rectifier in a vintage car battery charger

My battery just died yesterday (actually left the lights on). Took it out for charging today but my new automatic charger for detect such low voltage to begin the charging process. So, I had to hook ...
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3answers
10k 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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1answer
383 views

Choosing “pull down” resistors for automotive diode logic XOR gate

Thanks to some members on here I finally managed to understand how a bridge rectifier can be used as a diode logic XOR gate in an automotive application. Now I'm trying to figure out how to select the ...
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3answers
3k views

Help me understand XOR gate with diode logic [closed]

I'm generally a pretty smart person, but for some reason I can't get my head wrapped around this one. A little background - I have performed this function before using two diodes and two SPDT ...
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2answers
833 views

How do I bypass the ac rectifier in a guitar amp so I can power it directly with DC power source instead of mains?

I have a guitar amp that died recently, the primary coil of the transformer lacks continuity when tested with a multi-meter. I am trying to power it with a 9V power source instead of AC power outlet. ...
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1answer
664 views

Which one is the primary and secondary side of this Transformer

I found it on a old laptop charging adapter. I what to know the primary and secondary side of this transformer. It has total 8 pins. Each side has 4 pins
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1answer
240 views

Three Phase rectifier [closed]

I just bought a electric bike BLDC motor that i have to use as a DC generator, in order to charge a 12V battery. I have many questions, all related to this project but seeing it from quite different ...
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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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2answers
372 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 ...
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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 ...
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1answer
1k 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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1answer
113 views

A problem regarding connecting the grounds within two seperate circuits

Figure 1 I am trying to design the above circuit for my project to create zero crossing detector as shown in the above figure. This configuration was proposed originally by the member named "...
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3answers
2k views

How to create a zero crossing detector using a full bridge wave rectified circuit

Currently 1) I have a full bridge wave rectified ac waveform of 10Vmax. 2) I also have a potentiometer adjustable DC waveform. 3) My rail voltages are +12V and -12V. 4) I currently supply my full ...
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4answers
3k 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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5answers
5k views

Center tap transformer with full bridge rectifier, number of rectifiers

I have a center-tapped transformer which outputs 12V-0V-12V. I was wondering what is the differences between using one full bridge rectifier and two to generate a positive and a negative DC rail. ...
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3answers
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Why E = (Vc + Vr) in a circuit with a capacitor and a resistor in series?

I want to understand how to think about a capacitor in an electrical circuit. Note: I'm looking for an explanation of the basics that would help me answer this question, not an advanced discussion of ...
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2answers
396 views

Split AC current from one wire into two wires (+ and - DC wires) using bridge rectifier [closed]

I am new and a novice. I apologize if this is a ridiculous question. I have a ground/bond wire coming from the Cable TV intersystem bonding bus bar that is carrying current and a lot of "noise" on it. ...
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5answers
2k views

capacitor power supply for 1 Amp output current

I'm trying to make a fairly small AC(220V) to DC convertor to power microcontrollers and some actuators. It needs to output a current of 1 amp to the load. I tried looking at using transformers, but ...
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1answer
760 views

Maximum forward voltage drop per bridge element at 4.0A dc

Can someone tell me what is the meaning of "Maximum forward voltage drop per bridge element at 4.0A dc is 1.1v" in 4 diode bridge rectifier? Does it mean that there is a voltage drop of 1.1v per ...
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1answer
138 views

Is the circuit a voltage doubler or not?

I'm not able to actually understand how the circuit behaves as a voltage doubler.From my understanding the circuit would behave as a voltage doubler if during the positive half cycle only D1 would ...
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3answers
715 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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1answer
403 views

Problem in understanding bridge rectifier [closed]

Why does electricity not flow from the other two diodes after it has been through the load in a full wave bridge rectifier? I'd asked this question on Physics SE but was told to ask it here.
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1answer
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220V AC to 220V DC rectifier bridge with Zener diode

I've made a rectifier bridge for converting 220V AC (supplied to mains in India) to 220V DC using 1N5408 Zener diode. Can you please tell me whether it will successfully work out? I will attach a ...
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4answers
272 views

Problem in understanding bridge rectifier

In a bridge rectifier (full wave) why do the electrons not flow from the other two diodes during a half cycle? Pls help me in understanding the concept.
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3answers
143 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 ...
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0answers
517 views

What happens to the load when a bridge rectifier is in over-voltage condition?

Please read carefully, this may or may not be trivial: Your bridge rectifier (Schottky diode based) is rated for 60 Volts Maximum Peak and the AC wave peaks at 65V for a short period of time. What ...
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3answers
608 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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0answers
429 views

Bridge rectifier protective resistor selection

I have a device with a supply voltage range requirement 12-24AC. The B80S bridge rectifier I am using recommends a 3.5 Ohm series resistor to limit inrush to acceptable levels. Initially I decided to ...
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1answer
5k views

How to wire a three phase bridge rectifier

I am doing a DIY three phase AC motor power generation project. I can understand the basics of electronics, and also understand how the wires are wired in a single phase rectifier. However, for three ...
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1answer
345 views

Bipolar energy harvesting circuit

I'm planning an energy harvesting circuit using LTC3105 (400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up). The problem is that my energy source is bipolar, although ...
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1answer
841 views

Rectifier voltage drop under load

I have a bridge rectifier that is converting 240v AC into approx 358V DC The rectifier is smoothed by 2 X 10,000uf capacitors Under full load, I am drawing 3000 watts on the DC side but for some ...
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2answers
4k views

Full-wave rectifier with pi-filter

For a project I'm working on, I've to calculate a function for the output voltage of this filter: The things I calculate: The input voltage: $$\text{U}_{\text{in}}\left(t\right)=\hat{\text{u}}\sin\...
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2answers
3k views

Can I use two bridge rectifiers to rectify 240 VAC split phase?

I have a bunch of bridge rectifiers rated at 25 Amps with a maximum input voltage of 140 VAC RMS. They work for fine for rectify the 120 VAC found from the wall in North America. Is it possible to ...
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2answers
3k 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 ...
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2answers
654 views

Does building an inexpensive bridge rectifier cheap flickering LED Christmas lights create safety concerns? [closed]

OK, I bit on Home Depot's door buster LED christmas lights... 150 LED lights for under $5 each. How could I resist? (Answer: By remembering that cheap LEDs flicker, AND that I'm sensitive to it. ) ...

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