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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Calculation of average current across load in silicon controlled half wave rectifier

I know that when anode to cathode current of thyristor drops below holding current then thyristor turns off. I actually stuck in solving numerical problem where i need to calculate average current in ...
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High voltage multiplier attempt - low voltage output

I have built a 15 stage voltage multiplier in hopes of multiplying an input voltage of 2kV to ~70kV. This voltage multiplier has been constructed with 3kV 1nF ceramic capacitors and diodes rated at ...
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Derive equation for half-wave rectifier with inductor and DC source load

I am trying to analyze a half-wave rectifier with an inductor and DC source load. I am reading a book on power electronics and the equations the author came up with are shown along with the circuit. I ...
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Ideal diode P-channel + matched transistor

I've eventually replicated the ideal diode as described in this schematic using a matched transistor pair. It seemed to be working fine at first, but my VDS is around 6-700 mV at only 8 A which is ...
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Current flow through the diode in the picture below

Power Electronics by Ned Mohan, Chapter 5 In Fig 5-3 (b), how can there be a current i in the circuit when source voltage Vs becomes neagtive? Wouldn't the diode be reverse biased?
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Optimum design of damping LC filter with parallel (R+C). There is a frequency in which value of R dosn't impact

Apologies for the not so clear title, but I don't know if there is a common phrase that describes the point of concern. I am taking an online course about input filter design interfacing the grid and ...
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DIY voltmeter safety concerns

I would like to build a voltmeter using an ATMEGA328P that measures AC mains voltage. I came across the following schematic which appears to be what I am looking for: The top part of the circuit goes ...
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Using body diodes of MOSFET for power rectification

I am designing a switch-mode welding power supply. The secondary current is 130 A at 24 V max and the switching frequency is 20 kHz. Using Schottky diodes for full bridge rectification results in ...
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Why are MOSFETs connected in reverse for synchronous rectification?

I'm trying to understand how synchronous rectification works. Here is an example in boost topology: The function of D1 is to allow current from left to right and ...
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Is harmonic distortion only a problem for the power company?

I know that harmonic distortion is a problem for the power company because it influences the power factor, but what about me as an end user? In my situation I would use 9 drivers of 200W (230VAC/48VDC)...
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Voltage drop in synchronous rectifier for post regulation of low voltage rail in multi-output PS?

Consider a supply for 3.3 V (V1) and 24 V (V2), 96 W each. I'd expect synchronous rectification with V1, and post regulation with V2. To decrease the Volt-seconds for an inductor, it seems ...
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How does the control of a three-phase PWM rectifier work?

I have been studying the control of three-phase PWM rectifiers i.e. control of the below power electronics circuit: This circuit can be modeled with exploiting of the space vectors in the stationary ...
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Unwanted saw tooth waveform on DC rails

I am somewhat new to electronics and am building up a dual rail power supply. Under no load the DC rails sit at about +15V and -15V. Please refer to the schematic and oscilloscope screenshot (below) ...
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Confusion between a half-wave and a centre-tapped full-wave rectifier

What voltages would I get if I use a half or full-wave rectifier (the standard ones made by diode)? I am a high schooler and our textbook just gave a very brief definition about both. Suppose I have ...
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Help with this 3-phase thyristor triggering board

I need a triggering board which is able to drive thyristors such as (s8006l), and I found this board on Aliexpress which might be the hidden gem I am looking for. enter link description here enter ...
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Do you think the output voltage is caused by an old capacitor?

I have a vacuum tube power supply which isn't producing the correct output voltage. I have removed the tube and all that is left is the transformer, inline 22 ohm resistor, CR201/202, R202/203 and ...
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How do we calculate output voltage in clipper circuits?

In the below circuit, when the diode is forward biased, the current is passing through it and not from load resistor (R_L), but the voltage across both of them (diode and R_L) is same as they are in ...
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SMPS Replacement Parts: UF5408 instead of 1N5408 in the bridge rect.. / Also UF5408 instead of TO220 25ns 5R06X fast diode in bridge followup

What makes a diode so special? We know (?) that rectifier diodes are heavily optimized for low forward drop. Uf5408 on the other hand, have considerably more forward drop while it provides fast trr. ...
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What is the most efficient circuit to control a 3-phase controlled rectifier circuit with the ability to control the firing angle?

I am trying to design a board to control a 3-phase full wave rectifier with the ability to control the firing angle (alpha) through a potentiometer or a selector, and I was wondering what are the most ...
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How best to control 6 IGBTs for 3-phase controlled rectification?

I am using a BLDC as a generator. I am hoping to get a steady 50 V at 100 A. The frequency and voltage of the 3-phase output are variable with motor speed and linearly related, and I measure a ...
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Choosing capacitor for the filter of a three phase full wave rectifier

I am designing a power management unit (PMU), which takes the power from an alternator (alternator output: three phases, 30-85VAC, 35-130Hz, Max current: 20A). I want to reduce the ripple using ...
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Required transformer voltage for voltage regulator tubes in series

First of all some small context: I am attempting to design and build a clock with old electricial components, without silicon components. This question is about the power supply circuit. Note that I ...
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Why does this battery boost circuit work?

Our equipment typically runs on 12 VDC as provided by the rectifier at the bottom of the diagram. In a few locations, excessive cable length requires extra voltage. They installed two 1.5 VDC cells in ...
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What do the highlighted values mean?

What do the highlighted values mean? We're conducting a lab on full-wave rectifiers and need to calculate the estimated values for Vp(out), Vdc, ripple factor and rms ripple factor (Vr). Any help is ...
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This is about half wave rectifier circuit

Why is there a huge percentage error difference in ripple voltage comparing experiment and calculation (red) and 12.9 % comparing experiment and simulation (green)? Why is there an increase in input ...
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LDO powered by a half-bridge rectifier connected to 9 VAC ripples when under load

I've been working on the a breakout board or the Pi Pico to measure voltage and current as well as turn on and off two relays. I've been basing it off of OpenEnergyMonitor's emontx3 and they suggested ...
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Three-phase full-wave bridge converter maximum firing delay

According to the textbook Power System Stability and Control by Prabha Kundur, the maximum firing delay of a thyristor is 180° with the following explanation: Why is he considering eb with ea? Doesn’...
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Is the STTH108 diode a suitable alternative for the STTH1L06?

The applied boost rectifier diode in the PFC converter shown below is an STTH1L06, but I used an STTH108, thinking that it has a higher voltage rate. There was no problem in no-load mode, but strong ...
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Use of solar inverter in micro hydro power plant

I am in a small hydro power generation project. According to best known system the turbine has mechanical gear boxes and belt/pully system to get controlled range of frequency, voltage and current ...
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How to determine the output frequency of a full-wave rectifier using an oscilloscope?

Input frequency: 60 Hz. Theoretically, I should get a 120 Hz output frequency.
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Why does two grounds vs one ground give different results in LTspice with rectifier circuit?

Here is my circuit (full wave rectifier). I have tried make it exactly as I saw on the internet, but it's not working. The voltage I am measuring is \$V_{R_1}\$ The real breadboard also showed me the ...
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How to measure the output voltage of a half wave, bridge and center tapped rectifier circuit using a multimeter and also a signal on oscilloscope

I am pretty new in electronics. I am curious about how to test the output voltage of the rectifier using DMM. Where to put the lead to get the voltage from a circuit. Do I have to measure it across ...
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How to short half of the secondary winding to the bridge rectifier? [closed]

How do I modify this circuit into a half-shorted one?
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Strange simulation result: Can a rectifier diode conduct when the output terminal is open?

How does the output voltage build up for the below circuit when the terminal is open? Does LTSPICE assume any default node capacitance which gets charged- Not sure what causes the discharge/ripple in ...
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PMSG connected to three-phase PWM rectifier - Simulink

I am implementing a controller for a three-phase rectifier in order to have a constant DC-link voltage. I have a PMSG which is connected to the rectifier and a capacitor (DC-link); I want to model ...
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Rectifier circuit grounding

I built a rectifier circuit, but when I attempt to measure the voltage, I only get a reading if my fingers are holding the meter leads to the rectifier leads. Am I not properly grounding the circuit ...
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Converting 24 VAC to 5 VDC with small output current

I have a transformer which outputs 0.33 A at 24 VAC. I would like to rectify this down to 5 VDC and minimal current, 50 mA being the maximum. I came across the following schematic which seems to be ...
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Rectifier diode specs not clear

https://www.tme.eu/Document/e6d16d51cc343d73832bf32cc9d69d1f/p2500a.pdf How does that "RthA < 4 K/W 1)" work? ...
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What technical issues need to be considered when choosing between full wave (two diodes) or bridge rectifier (four diodes)?

I've been reading (searching the net) on the differences between the two: It seems a bridge rectifier is more efficient in terms of the transformer construction. The bridge rectifier has a bigger ...
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Can UF4007 diodes rectify a 1 MHz triangle wave?

If the input wave is a 1 MHz triangle wave, will UF4007 diodes be able to rectify it without distorting the output triangle waveform too much?
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Efficient way to drop AC voltage in LED constant-current driver

I am trying to power a string of 24 LEDs which are connected in series (re-used from an LED bulb) from 120 V mains AC. Each LED has a Vf of 3.2 V, and a 150 mA maximum rating. To limit the LED current ...
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Are there active rectifiers that consume whole sine wave?

Basic rectifiers use mostly the top of the sine amplitude (when the sine gets above the capacitor's voltage), which results in the sine amplitude tops being cut. Are there rectifiers that consume ...
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Simple rectifier circuit fails under load

I have a problem with a simple rectifier circuit that is designed to drive a DC motor. The motor is part of a ripple tank for a high school physics lab. The input to the circuit is 12 VAC from a bench ...
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If the current has changed directions, why is it still positive in a negative half wave rectifier?

I have simulated a simple half wave rectifier circuit and plotted the current in the circuit and the voltage across the load resistor of 4 kilo ohms. The diode is an ideal one. The alternating voltage ...
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AC to DC 6 V for bicycle and super capacitors for lights

I’m trying to design a circuit to enable my bicycle lights and also have at least 2 minutes of standing lights coming from a bicycle 6 V AC hub. I thought about building a rectifier bridge with 4 ...
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Why is this not a negative half wave rectifier? What is it?

In the AC circuit below with \$V_{IN} = 20\sin(\omega t)\$ and \$\omega=1\pi\$, we have an ideal diode (inverted) and a capacitor in parallel with a resistor. I want to study the voltage across the ...
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AC RMS from half wave controlled rectifier

I have built the following circuit: I measured the AC RMS at output as 975.8 mV: I can't get anywhere close to that measured value when using the AC voltmeter formula below (for delay angle of 90): ...
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Output power for resitive load half controlled rectifier [closed]

I have calculated power as V^2 / R so 140.1 x 140.1 / 200. It was marked incorrect. I can't see what I'm missing here?
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Voltage/current rating for center-tapped rectifier vs. full-bridge rectifier

I am currently working on an LLC resonant converter. While reading an application note from ST microelectronics, I found something about using different rectifiers for different purposes. I ...
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Question about LM1815 implementation

After asking here a question about my motor sensor (a VR sensor or Reluctor), I've found the LM1815 chip (and also the MAX9924 but too much complex for my use). I want to use it to get the RPM engine ...

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