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# Questions tagged [rectifier]

These are part of AC to DC conversion. A half-wave rectifier keeps only the positive part of the signal. A full-wave rectifier also keeps the negative part, but flips it to make it positive too.

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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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7 votes
1 answer
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### Tried making a "poor man's" active/MOSFET rectifier. It doesn't work, and I didn't expect it to, but I don't understand why

I attempted to design and assemble a "poor man's" 3-phase AC rectifier that uses MOSFETs without being driven by a gate driver. The only thing driving the gates are the opposing phases. In ...
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### Heatsink can cause a shortcircuit what kind of problem occurs?

I'm not sure what will happen in this kind of scenario I'll share the photo of two diodes and basic connections below. These two diodes tab points are actually connecting same node because of tab is ...
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### I have problem with finding the equation of AC to DC voltage for three phase five wire rectifier [duplicate]

I am writing a thesis about telecommunication tower. A problem came up when I examined the power supply. Most telecommunication equipment uses -48V DC and my supervisor wants me to add the equation ...
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3 answers
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### Power output of a full bridge diode rectifier

Assume a simple circuit with a 12 V (RMS) AC supply and a 100 ohms load resistor. The power dissipated is P = V^2/R = 1.44 W. Now assume that a full bridge diode rectifier (without filtering) is ...
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### Trouble getting current form BLDC generator

I am designing a battery charger using a BLDC motor attached to stationary bike, I was giving this project hoping to fix the current output because is delivering low amps to the charger even at ...
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1 answer
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### ID & Possible Substitutions for Blown Old Vishay SMD Component

can anyone please identify the component "VD20" (Marked SJ 47A with Vishay logo) pictured in the attached images. There are 8 of these similarly marked components still intact on the board. ...
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### Full wave bridge rectifier with Pi or T filter simulation won't converge

I'm designing a full wave bridge rectifier and want to compare a pi filter and T filter after the rectification. I intend to add a transformer at the input and a buck-boost converter on the output. ...
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### How do half-wave RF rectifiers manage efficiencies above 50%?-A theory

First off, this exact question was directly asked here EDAboard and I think it was hinted at in atleast two other posts on this exchange programmingEnthusiast, frick, by Andy AKA, who mentioned a 100% ...
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4 answers
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### I made a 3-phase power rectifier circuit with "ideal" diodes. Is there anything I should change?

I made this 3 phase power rectifier with ideal diodes, instead of actual diodes. I basically just copied an ideal diode diagram and pasted it 6 times. It's for use on a wind turbine project, to ...
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### How to make an ideal rectifier which can efficiently rectify 3 phase AC for power applications? [closed]

I'm working on a wind turbine project which needs to be able to rectify 3 phase AC with varying voltages. The lowest the input voltage will likely be is 2V, while the higher end will be 27V. I've been ...
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### How do I understand the reason behind the incorrect result in below LTspice simulation?

Shown below is the LTspice simulation for a full bridge rectifier. The simulation shows 'wrong' result for open load condition (Rload =1 GΩ). Ideally it should be same as other 2 cases. Why is the ...
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2 answers
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### Which is better - series or parallel rectifier? [closed]

The idea for this question gave me the question Understanding positive and negative rectifiers. Here I want to summarize the ideas behind the two circuit configurations - series and parallel, hoping ...
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### Understanding positive and negative rectifiers [closed]

How is the first circuit a negative rectifier? My thought is the current flows forward so the diode turned into a short and Vout is postive, and if current is reversed then the diode blocks the flow. ...
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4 answers
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### MOSFET Driving for a Dump Load Resistor within a wind turbine

I am currently designing an AC-DC rectifier for a 6 kW small-scale wind turbine. As part of this setup, I intend to integrate a dump load resistor to regulate overvoltage. When the DC voltage reaches ...
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### Determining the region of operation of these two diodes

I'm having trouble determining the region of operation for these two (ideal) diodes. Do I check the Vopencircuit values or their current values?
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### Troubleshooting Vacuum Roller Motor

I am trying to repair a vacuum so that the carpet roller will work again (motor does not run). I have disassembled the head of the vacuum and found what is probably a fairly simple electronics board ...
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2 answers
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### 24 VAC signal rectifier and detection

One of my projects consists of recovering a 24 VAC signal to give a run command. To avoid using a relay with a 24 VAC coil I would prefer to convert the 24 VAC signal into a DC signal and use an ...
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### Would an AC EMI filter capacitors contribute to inrush current?

Shown below is an EMI filter for an AC input. My doubt is when I analyse the inrush current, should I be considering the contribution due to all three capacitors? a) Differential mode capacitors b) ...
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1 vote
2 answers
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### Why do reversible connectors duplicate pins versus just rectifying the inputs?

I understand that some reversible connectors already rectify symmetric power pins (not USBC.) Generally all data moves over balanced pair wires. Couldn't the balanced pairs also be simply rectified? ...
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### What is wrong with below circuit simulation of RC filter with rectified AC input?

I am trying to find the average rectified AC output from a bridge rectifier output and the simulation results do not seem to match with the theoretical calculations well. Should n't the RC circuit act ...
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### Explanation of the circuit diagram of a PIR sensor activated light

Can someone please explain the operation of this circuit diagram of a PIR sensor led light. The high voltage "ground" connections in the original diagram have been replaced with connections ...
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### Using BTN8962TA to implement 3 phase synchronous rectifier

I want to use three BTN8962TA (datasheet) to implement a 3 phase synchronous rectifier. The input will be a BLCD motor used as a generator. The current at each phase will be measured with external ...
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1 answer
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### Modify or adapt a device using low-voltage AC to accept DC

A few years ago, a family member asked me to look at a set of bookshelf speakers that stopped working. Inside I noticed obvious signs of a cooked component on the internal power supply, which was a ...
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### DC Load Current Vs RMS Load Current in single phase half wave rectifier

While solving a problem of a single wave half wave rectifier. using an "Ideal Diode" Given Details: Load Resistance - 1020 Ohms Supply - 230V 50Hz AC (Connected in series) To find : DC ...
2 votes
2 answers
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### What is the average value of current in uncontrolled rectifiers with rl Load

I am trying to calculate the average value of a current in single phase rectifier half wave and in the full wave with RL Load. The thing that I am finding interesting is that in all the tutorials and ...
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### Full wave rectifier 2nd and 4th waves doesn't go up as it should [duplicate]

I'm using four 1N4007 diodes and one 15k resistor. I already changed diodes and cables dozens of times, it doesn't change, even I change the oscilloscope or arbitrary function generator, nothing ...
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### Simulating a controlled rectifier with CMOS , using Isis Proteus

I am currently in the simulation phase of a controlled rectifier, and I must use CMOS technology. However, I am a novice in this field and would appreciate detailed advice to help me get started. ...
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### Full wave rectifier behavior

This is a center tapped full wave rectifier. From my understanding if D1 = forward bias and D2 = reverse bias during the positive cycle of AC, why does VD1 from the graph show 0 voltage during the ...
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### MAX4053 IC, V+ & V- , suitable dual diode

On the PCB of a multimeter with MAX4053, V+ & V- is from external dual diode, please tell what type of diode it must be. A screenshot from the MAX 4053 datasheet is attached. Need the type of the ...
1 vote
3 answers
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### Can a capacitor of lower capacity than required be harmful?

I want to make a full wave rectifier for my highschool physics project. My mentor suggested I get a 24V 1000μF for it but I could only get my hands on a 50V 100μF capacitor. The voltage supply is a 9-...
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### Exploding/superhot capacitor in XT AC-DC PSU

I have a commercial replacement PSU that I am using for a vintage XT class computer which has 4 DC lines (5v, 12v, -12v and -5v). On fitting the PSU however, the PC operated but after a while under ...
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### Square wave rectified output value calculation

I can understand the ground osc probe but with a hand osc I shouldn´t have that problem, I think. But It went even worst. Maybe it is a doubler¿?
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### Component identification from ATV regulator/rectifier

I'm trying to identify this component from an ATV regulator. It looks like a semi controlled rectifier? I am trying to look up the datasheet.
1 vote
3 answers
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### Transistor specs in the capacitance multiplier

I'm working on a constant current power supply and as a first step designed the following rectifier with a filter. I know the bottom rectifier is inactive, but with couple of switches the circuit ...
2 votes
3 answers
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### The output of my rectifier which should be charging a capacitor on LTSpice is extremely jumpy and inconsistent

For some reason, every time that I include a capacitor in this circuit LTSpice transient analysis is very jumpy. Is there a better way to use the output of a bridge rectifier for this purpose? I tried ...
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1 vote
1 answer
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### Valve amp power supply filtering with centre tapped transformers

I am designing a valve amplifier and am planning to use GU50 output pentodes in the power stage (PP). They can take up to 1kV on the anode but have an upper limit of 250V on the screen (which also ...
0 votes
1 answer
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### DC Voltage Across Load in Central Tapped Full wave rectifier

A 230 V, 60 Hz voltage is applied to the primary of a 5:1 step-down, center-tap transformer use in a full wave rectifier having a load of 900 Ω. If the diode resistance and secondary coil resistance ...
1 vote
1 answer
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### Testing out a bridge rectifier if it works with only a multimeter

Indulge me here with this scenario, but suppose the electronics shop I'm sourcing parts have dubious, faulty semiconductors parts -- damaged, counterfeit, etc. What have you. How do I test if a bridge ...
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### Peak to peak voltage

What is the formula to calculate the peak to peak voltage at the input of 7805 voltage regulator/at the output of 10 microfarad capacitor in this circuit? https://theorycircuit.com/7805-ic-circuit-...
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5 votes
2 answers
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### What is this component? It looks like a rectifier with 149k as identifier

It looks like a rectifier with "pec" as manufacturer and 149k as identifier. I am trying to look up the datasheet.
2 votes
3 answers
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### What is the difference between these two circuits?

Here I have a circuit for a full-wave bridge rectifier with capacitor filtering. And here is another circuit with two filter capacitors. What effect does the second filter capacitor provide?
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### Identifying faulty component in AC-DC regulated PSU

I'm debugging this faulty AC-DC power supply circuit, which is meant to output 24 V DC from a 240 V AC supply. The 24 V line is actually about 10.1 V under load. I have tested ZD1 and ZD2 which seem ...
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2 votes
1 answer
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### Why is this precision rectifier circuit not producing a perfect output?

Can someone explain to me why this precision rectifier circuit isn't fully rectifying the signal? It seems to work well until the crest of the non-inverted sine wave signal. I've been trying to ...
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### U16C60D - Dual Series Connection Rectifier

I can't find any replacement for the U16C60D rectifier. It is possible to put two seperate diodes (each at 8A/600V) in series like the "U16C60D" or inside the component it is not only just a ...
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### General formula for the ripple voltage in a loaded bridge rectifier

What is the general formula to calculate the peak to peak ripple voltage and Vdc average of the voltage at the input of the 7805 voltage regulator in a circuit like this? Suppose the load is a fixed ...
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### Input capacitors to the 7805 voltage regulator [duplicate]

What is the purpose of the 1000 µF and 0.22 µF capacitors at the input of 7805 voltage regulator? Input to these capacitors is the rectified pulsating DC voltage. What will be the shape of this ...
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1 vote
1 answer
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### Input and output voltage of 7805

In the diagram below the input voltage to the ic 7805 is the output voltage of the capacitors (1000 micro Farad and 0.22 micro Farad). The peak voltage arcoss the input of ic 7805 is the same as the ...
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1 vote
0 answers
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### Is this a valid way to determine which diodes are on in an op-amp based rectifier?

Consider the circuit above, where we are treating the diodes as ideal. Let's take the case where Vs < 0. Since V- = V+ = 0 for both U8 and U9, that automatically means the current is to the left ...
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### Rectifier output voltage in RC and LC choke input filters

Why does the choke input filter produce a DC output voltage equal to the average value of the rectified voltage given as input to this filter, while the capacitor input filter produces a DC output ...
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