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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57 views

Rectify AC and keep the voltage below V_max for DC step down converter

I bought a DC-DC step down converter (MP1584EN), but I found out my input was actually AC (24 V). I plan to use a bridge rectifier with a smoothing capacitor The problem is that the converter is ...
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51 views

Why are inverter modules extremely oversized in VFDs?

I was checking a faulty Schneider VFD (ATV312H037N4) which is rated for a nominal output current of 1.5 A. Turns out the rectifier bridge of the inverter module (FP10R12YT3) blew up and after reading ...
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How is the voltage after the Bridge equal to 10.2? [duplicate]

Shouldn't it be much less ? how is that ? can someone please help me understand this circuit
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What do I and V mean in C = It/V?

I am trying to determine what value capacitor I need to put after the full wave rectifier to get a smooth voltage for charging my battery. However, I don't understand which current and voltage do the ...
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How can I find the time at which the diode charges the capacitor every cycle(half wave rectifier)

Half wave rectifier is given and given values are : V_p = 10V, V_d = 0.7V, 1/T = 60Hz, R = 10. I want to know when C = 0.1F, how can I find the time at which the diode charges the capacitor every ...
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Why is the output DC voltage of full wave rectifier not equal to the RMS of the original AC input?

https://www.electronics-tutorials.ws/accircuits/average-voltage.html https://www.electronics-tutorials.ws/accircuits/rms-voltage.html I understand that the RMS of an AC voltage is the magnitude of ...
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Smoothing capacitor for half wave rectification

I'm trying to implement a half-wave rectifier using just a diode. I'm using a unity gain opamp for isolation from the mains. At the output of the opamp, I'm using a smoothing capacitor to get a DC ...
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51 views

How to use a sprinkler valve in multiple zones?

I am currently setting up an outside irrigation system. When I built the system, I thought the irrigation controller would allow me to power multiple zones at the same time, and that each valve - ...
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57 views

Full wave center tapped transformer output voltage

I have a full wave center tapped transformer circuit with input voltage of 220V How do I get an output voltage of 15V. What equations should I use ? Here is the circuit:
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How to calculate the current through load resistance in the given diagram?

I am here with yet another problem, where I have to find load current, ripple voltage, approx turns ratio? Also, any idea about how can we reduce ripple voltage further? Attempt: This is a step-down ...
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What is the function of zener diode in the fig and power dissipated in zener at No load condition?

If supply is producing max 20mA at 9V what will be the value of Rz? To improve the current capability, how can we use NPN transistor instead of diode here? Ans: According to my understanding, it is ...
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How can I get this large value of peak current in half wave rectifier?

Given values are: C = 1.4F, V_D = 0.8V, V_P = 4.5V, and 1/T is 60Hz, 0.436ohm load. I have to find the peak diode current. I understand when diode is on and delta T starts, the diode current get ...
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Voltage notch behavior

I am using software to simulate and learn more about 3-phase semi-conductor rectifiers (using SCR.) I also learn about the voltage notches due to the possible overlap between the SCR commutation. If I ...
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Why more voltage after full rectification

I used 105j 400 V capacitor. Connected it to 230 V AC. Then I measured voltage after capacitor and it was reduced to 116 V AC. Then I checked voltage after 4 diode rectification, here measured 204 V ...
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How to get rid of floating voltage on Bridge rectifier

I'm trying to implement a rectifier and AC voltage sensor. The rectifier part works just fine. I'm able to power my device without any issues. Please look at C2 in the screenshot (Circuit schematic)....
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What electric setup do I need to get electricity from a BLDC motor?

I'm trying to create a small scale wind turbine for a project. I plan on using a BLDC motor with some blades on it to capture artificially created wind. I'm new to electronics, but I was thinking of ...
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Identify the component

In the given question, I see figure 3 has a common terminal which is more likely to be a full wave rectifier and figure 4 has 4 terminals which resemble that of a bridge rectifier, am I correct in ...
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power electronics inquiry

I want to ask you about the following graph exactly the added resistance after the rectifier and the filter. Is it ok to add this resistance to make sure that the filtered voltage will occur on the ...
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AC-DC High voltage converter

I don't have much experience with power electronics but I'm trying to design a power supply with AC 220Vrms (311peak) to DC 1500V converter to charge a capacitor in 50 miliseconds (and keep charging ...
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Three-phase rectifier for offline single-phase supplies

First thank you for the help. I'll try to explain my self for this problem and sorry in advance if I'm not very clear, english is not my native language. I'm making a universal PCB design involving ...
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61 views

Why is the oscilloscope in Multisim software showing more voltage than the source?

The Multisim oscilloscope shows around 13V peak despite the voltage source being 12V peak. I was expecting 12V. The diode voltage drop is set to 0.1v when forward biased. Am I missing something?
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Rectifier and AC voltage sensor

I'm trying to build an AC rectifier circuit and an AC voltage sensor. The rectifier output is used to power my IoT device which consumes 0.3 A at 12 V. It can take a voltage between 12 V to 30 V. The ...
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Is there a way to recycle/use negative half of AC voltage from a rectifier?

Forgive me, as I am far from an electrical engineer, but when rectifiers were explained to me I found that a rectifier allows current only in one direction, which allows it to filter out negative ...
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Windmill 3 Phase AC control PCB

I've created a PCB for my newly built 3D printed Windmill. Now I am not entirely sure about all the components and the way they function, so I'd like to have your opinion on the circuitry before I ...
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Three Phase Rectifier Question (student)

I am new to this forum. I am an Electrical Engineering student working on a project. I am using Matlab Simulink/Simscape to perform simulations. Currently, I am working on a three-phase rectifier. (...
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Current transformer and amplifier + precision rectifier

I am trying to design a precision rectifier, to detect AC current through a current transformer. With a 22 Ω burden resistor and a test bulb, the CT I have gives me a pretty ugly 20 mV sinusoid with a ...
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Step down 3 phase 2kV AC to 3-12V at modest current (5-20mA max)

I'm looking for a way to step down 3 phase, 2kV AC power to 3-12V DC. I do not have a neutral, just the 3 phases and ground. This will be entirely isolated, nobody will be anywhere near this thing. ...
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Uneven current distribution in center-tap transformer secondary winding of LLC resonant converter at low load

I'm trying to design an 24V 50W LLC resonant converter with a resonance frequency of 250kHz. I've run into an issue with the center-tapped transformer that i can't quite find a reason for though. For ...
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57 views

Rectifier to Step Down Buck Regulator

I'm trying to simulate an AC to DC voltage regulator. I'm trying to go from 115 Vrms to 5 V DC at 1 amp max, though 0.5 amps nominally. I initially thought of using the LM317 at first, but after ...
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Ground in the circuit of full wave rectifier

While performing rectification task in lab. We use 0V and 12V as negative and positive terminal of input supply in central tap full wave rectifier and -6V and 6V as negative and positive terminal of ...
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Rough calculations for heatsink and mains current

I'm designing a rectifier to output two voltages. Because of the output voltages, I'm using two transformers to get the needed input voltages as shown in the schematic below: simulate this circuit &...
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Wiring a transformer with two primary windings

I'm building a circuit that involves the use of multiple transformers. I've mainly used transformers that had one primary and one or two secondary windings. However, this time, the transformer I'm ...
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Signal return path between circuits with separate full-bridge rectifiers

Edit: I think I've figured out WHY this is happening (see my answer below), but I still would love to hear ways to mitigate this issue. I've got two microcontrollers that are powered by the same dc ...
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Three-phase active rectifier - Confusion between rectifier and inverter mode

I understand how a 3-phase inverter works (with 6 IGBTs or Mosfets). However I'm a bit puzzled when using it as an active rectifier. For reference, here's an example of the circuit I'm talking about. ...
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What's the use of the average voltage in rectifiers?

I've noticed that there is much talking about \$V_{dc}\$ in rectifiers (specifically, the half-wave rectifier) and less focus is given to \$V_{rms}\$. Why is that? I thought the RMS value was the much ...
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What happens when you put two rectifiers in series to get DC from a stepper motor?

For a project a stepper motor is used as a generator because of the decent amount of power at low RPM. Now have found that one rectifier is sufficient when placing the coils in series. First however, ...
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How do you design a bridge rectifier circuit?

I am trying to design a bridge rectifier circuit (without capacitor). When I try measuring and graphing the output and input, the input looks fine but the output is just a straight line. Did I design ...
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92 views

Low voltage AC relay

I have an appliance that is turned on by a timer circuit. I would like to switch my furnace blower fan when the appliance is on. For that I figured I would need a relay that I would add in series with ...
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Effect of capacitor size on output voltage of a rectifier circuit

I have been analysing a half-wave rectifier circuit, in which a smoothing capacitor is used to filter the undulations present. I have experimented with different capacitor sizes on Multisim. I ...
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Powering small DC load ( 1W ) using 220V AC supply

I am trying to design a small control circuit for controlling large currents (not too large, around 200W, AC 50Hz). I have kept in the AC circuit isolated from the DC control circuit. But the problem ...
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177 views

Choice of resistor in half wave rectifier

I found following schematic of a half wave rectifier (from here) and I was wondering how to choose the resistor, and I have following questions: Is it correct that this resistor is basically ...
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How to place two inductors on the pcb? Which is better: example A, B or C?

I'm making a single phase pwm rectifier as my final year project. General topology consist of an inductor that connects ac voltage source with an inverter, as in the picture below: But since this is ...
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Please troubleshoot this full-wave rectifier circuit using op-amps

I am designing a full-wave rectifier using op-amps, which need to rectify a signal between 0 and 10 V, to a voltage between 5 and 10 V. The circuit works properly when the input voltage is between 0 ...
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misunderstanding of Voltage output of a 3-phase rectifier

I simulated a 3 phase rectifier : I obtained V1 and V2 as plotted below : I dont understand that waveform as i'm supposed to obtain a DC voltage. Can someone explain me how it comes that i got ...
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bridge rectifier [closed]

I've got a PCB board with a bridge rectifier with PIN (AC + AC -) I think I made a mistake because almost all bridges are (+ AC AC -) I try to find any bridges of 3-5A on Aliexpress but I didn't find ...
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High voltage power supply

We are given this schematic diagram, that our teacher called a high voltage power supply, then test the voltage of each capacitor. Why is the voltage at C1 half of the voltage at C2 and is the ...
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Understanding Source Peaks with Half-Wave Rectifier with Capacitive Filter

We started going over simple rectifier circuits in my electronics lab yesterday. When I implemented this circuit I was a bit confused by the source signal on the oscilloscope: and the readout: I ...
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Chassis potential of an old transformerless valve / tube TV

Long, long ago, some friends and I in school used to try to repair old valve (tube) TVs. Most commonly the repair was just by cannibalizing another old set; we did not have any budget for spares but ...
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Low voltage / high current rectifier using MOSFET

I was wondering if the following approach to make a very low voltage / high current rectifier (~0.1 V, 1 kA DC) from 230 V AC has any sense or not. Aiming at simplicity rather than effectiveness, I ...
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Rectifiers operation when there is a sudden voltage drop

Currently studying rectifiers and came along a paragraph in a book that left me puzzled. "In a full-bridge rectifier supplying an inductive load, if there is a sudden drop on the AC voltage at the ...

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