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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601 views

Should I buy a diode with higher maximum ratings if it costs the same?

I need a diode that prevents surge currents from a DC motor flowing back into the power supply. The motor draws a continuous of 10A at 12V. Was checking a store for a rectifier diode and found out, ...
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60 views

Making a variable DC power supply [closed]

I have a treadmill 90V DC motor I am trying to install on my lathe. I bought a rectifier and a 90V-6V pulse width modifier. It had 105 DC volts going to the modifier. I hooked it up and instantly ...
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3answers
59 views

How can this circuit be best described?

Here, the green waveform is the input waveform(V1) and the blue waveform is the potential drop across Vc1 and Vc2. To me it seems like a peak detector getting clamped, but then the first half cycle ...
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57 views

What is this circuit with increasing voltage of full rectified wave?

{ The first image is original circuit.} { The second image is the output across RL resistor with ac source amplitude voltage 5V. } {Simulated circuit with output measured between A and B nodes.} To me ...
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1answer
74 views

Can the skin / copper oxide / copper junction of an old exposed mains conductor produce a safety-significant DC component to a shock?

Copper oxide diodes are not common now but were a standard item along with selenium oxide for early power rectifiers (think old radios and those components with stacks of fins). Can the oxide layer on ...
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73 views

Regulating high voltage high current ac supply

I am trying regulate ~250 ac to have regulated 400v 5A dc. I have a variac and also a step up transformer (1:5). I know for this type of high voltages full bridge SMPS are used. But actually I don't ...
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1answer
66 views

Precision rectifier doesn't give expected output

I'm currently designing a precision rectifier. I have a current sensor that outputs a current (AC) of 0.3mA to 32mA for 0-100A across a resistor of 510 ohms. As the value of the voltage will be around ...
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1answer
32 views

Synchronous Buck Converter Mathematics

Ive been trying to find a mathematical explanation on how a Synchronous Buck converter maintains continuous operation under ideal steady state conditions. I understand the underlying concept but i ...
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1answer
67 views

Can I use rectifier diodes with DC (1N4002)?

I have an HTronic 19 00 33 AC/DC converter. I would like to use it as a DC/DC step down converter to transform 12V DC into 5V. I could not find the datasheet in English, here is the German version. ...
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46 views

Electrical energy transformation

I'm working on a DIY solar inverter. The goal is to make the battery connected to it rechargable by both energy from solar panels and AC mains (if there is power supply.) My battery is 24V DC, AC main ...
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1answer
43 views

Switching from full to half wave rectification

The Context: Multiple manufacturers of electro-magnetic brakes offer rectifier modules to switch their DC brakes with an AC feed. This can often be tied to the same phases turning the motor, so that ...
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Simple rectifier, solar to 18v ac

Would it be possible to charge a Ring video door bell from solar power, but using the doorbells external pins for the wiring of a 8 to 24v ac transformer. Say using a 12v solar panel, would regulation ...
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1answer
35 views

How to charge a capacitor using repeatable damped sinusoid current signals?

I am trying to charge a capacitor using repeatable damped sinusoid current signals from a piezoelectric bender - Result of the free vibration of the piezo beam(Current source plus piezoelectric ...
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62 views

Fan speed slows down, the moment a new load is added

I am using a rectifier, and 4500uF capacitor to reduce the ripple. After connecting to the power source (60Hz, 120V), I was able to turn on the fan. The issue occurs when I turn the switch on to power ...
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1answer
51 views

Rectifier for bike dynamo

I'm building a lighting system for a bike, powered by a dynamo (typically rated 6V, 3W max). The load will include LEDs and a bit of logic (such as N555/ATTiny85 for blinking, etc.). I also plan to ...
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30 views

Rload in half wave rectifier

Does Rload play a huge role in a half wave rectifier?, why when I change the value of Rl the output of the half-wave rectifier graph changes?
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Basics of high voltage DC motor driver with IGBT

I'm trying to drive 140V 4.5kW brushed DC pancake motor. I have to change motor speed and direction. All drive actions must be very smooth and sensitive. I drew a simple 4 quadrant IGBT controlled ...
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1answer
79 views

Can anyone help me how to convert 100mV AC to 1.5V DC without using any external power supplies

I am looking for a CMOS circuit that will help me to convert 100mV of AC to DC and that DC should boosted to 1.5V. Firstly can anyone suggest me a CMOS circuit to convert 100mV of AC to DC. And DC to ...
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1answer
118 views

What is the name of the device that combines and synchronizes two AC sources into one?

I saw this device on Amazon for $450, I already forgot what it was called and am trying to find it again. It let you combine two AC sources, and the voltage would only flow one way, and it would ...
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1answer
40 views

Half Wave Rectifier - Voltage Signal Across Diode vs Voltage Signal Output of Diode

I am learning how to work rectifiers and I build a half-wave rectifier to test signal in simulation. When I add probe output of diode and voltmeter across the diode, the signals are different. It ...
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58 views

Why do we use RMS current as the input current for calculating efficiency of half-wave rectifier?

Vi = Vmsin(ωt) Im = Vm⁄R = maximum amplitude of dc current Irms = Im⁄2 Iavg = Im⁄π η = Pdc⁄Pi = efficiency Pi = (Iavg)2R Pdc = (Irms)2R Since the negative portion of the wave is not involved : Why ...
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2answers
53 views

Analogue current and voltage regulation and rectification thereafter

I am a research scholar working on mechanical metallurgy as a part of my engineering study. For my project (a new kind of electroplating,) I need voltage ranging from minimum 0V to maximum 170V DC. We ...
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29 views

Resonant frequency of a three phase thyristor rectifier

I am trying to inspect how my circuit behaves at operating points around resonant frequency. Is resonant frequency simple equal to 1/(2Pisqrt(LC)) = 1/(2pisqrt(590uH240uF)) = 423 Hz (see the circuit ...
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3answers
176 views

Use of different diodes in a bridge rectifier

I'm repairing the circuit for a motion-activated LED light. The PCB uses a capacitive dropper circuit as the power supply. Photos of the PCB and the corresponding reverse-engineered power schematic ...
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43 views

Calculation vs. simulation of DC output voltage from full wave bridge rectifier, through voltage divider, with no transformer

I'm designing a circuit using an Arduino to measure / monitor US line voltage; single phase 120VAC (170v peak) @ 60Hz. The circuit itself is a simple full wave bridge rectifier using 1N4007s. The ...
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3answers
105 views

Explanations regarding the blocking of diodes in single phase rectifier

I have started an analog circuits course and have trouble understanding the behavior of such opAmps and rectifiers. This is the circuit given as example, however there's no extra explanations ...
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1answer
55 views

(Experiment) What if I run a DC motor with unfiltered sine pulse DC voltage?

I have read a lot about using high frequency square/rectangular wave pulsed DC for motor speed control aka PWM-ing, but my question is a bit different. What if I run a DC motor with a low frequency ...
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2answers
78 views

Is it possible for a DC LDO to be able to take in AC and DC

I have an LDO TPS7B69 which takes in up to 40V DC and regulates it to 5V. This LDO typically takes in DC, but I would also like it to be powered by AC 40 volts peak max at 50Hz or greater. ...
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49 views

How does a multi-meter diode check work and how to test an RF diode with it?

This is a followup question for Can I debug this simple circuit without VNA and proper RF equipment? which I am still fighting. The diode as a nonlinear element could explain all the weird behavior I ...
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1answer
39 views

Read 24 Vac signal with a Raspberry Pi

I want to read a 24 Vac signal coming from my old automatic gate with my Raspberry Pi. The signal tells me if the gate is OPEN->24 Vac or CLOSED->0 Vac. Raspberry Pi input are 3.3 Vdc tollerant. ...
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60 views

N-stage rectifier as AM demodulator?

I want to downconvert a simple 100kbit/s NRZ OOK/ASK signal from 900 MHz. In a previous design I found two options: Option 1: simulate this circuit – Schematic created using CircuitLab Option 2:...
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105 views

LTspice three phase rectifier simulation

I am interested in creating from scratch a regulator rectifier for motorcycle. I struggle to comprehend the ground placement in the simulator. I cannot find instructions about tree phase simulation. ...
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1answer
59 views

Can a Vienna rectifier or an active front end rectifier regulate the voltage down?

I learn the basics of rectifiers. In particular, Vienna rectifier and active front end recifier. As I understand it, both types of rectifiers can work in the mode of increasing the output voltage. But ...
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3answers
111 views

How to proceed with resistor that is series to the diode in a half wave rectifier circuit?

The formulas I normally use don't have R1 on them and I don't know what to do.
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1answer
143 views

Input voltage drop in LM358 with “an improved precision rectifier circuit.”

I found the input voltage drops around 2V drop (observed from oscilloscope) when I connect the ion mobility spectrometer (IMS) signal to the circuit "an improved precision rectifier circuit",...
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56 views

Full bridge rectifier forward voltage definition

I am looking for an efficient way to rectify a 3–20V AC voltage (at ≤2A) and am therefore looking at integrated full bridge rectifiers and discrete Schkottky diodes. In a datasheet of a full bridge ...
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1answer
79 views

Why do appliances use complicated circuits to convert AC to DC instead of just using a battery? [closed]

What I'm trying to say is why huge rectifier circuits are needed just for converting AC to DC. Why can't the rectifier be replaced with a battery and a battery charger? Since batteries can supply a ...
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67 views

Pitfalls of using only two diodes in a “full wave rectifier”?

Scenario: I have a small signal from a Piezo element which I am amplifying using a fully differential amplifier. Thus, my gained output from this In-amp are "two" (sine) waves inverse of ...
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0answers
456 views

How do you find the peak-to-peak ripple voltage of a full wave bridge rectifier?

The 32VRMS secondary of a transformer feeds a full wave rectifier and capacitor filter as shown in the circuit The peak-to-peak ripple of the output voltage of this circuit needs to be less than 1V ...
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3answers
67 views

Finding the capacitance of a full wave rectifier

I am currently learning electrical engineering,and I'm having trouble in finding the capacitance of a full wave rectifier so that it would match the graphs below. From the image below, the input ...
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3answers
97 views

Op amp maximum input voltage

Many Precision Rectifier Single Supply Op Amp circuits feed the input AC waveform into the non-inverting (+) terminal of an op amp e.g. see this schematic: Image source: Precision full-wave signal ...
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1answer
40 views

Formula question about the Bridge and full wave rectifier,where are these number from?

i learn something formula of Bridge and full wave rectifier from my book DC voltage \$V_{DC}=V_m-\frac{V_{r_{(pp)}}}{2}\$,\$V_m\$ is the amplitude of sine wave voltage, \$V_{r_{(pp)}}\$ is the peak ...
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38 views

Rectifying a spark coil that produces 10 kHz

I am working on a project where I want 10 to 30 kV DC (to energize two capacitors in series rated at 28 kV per capacitor). I bought a couple of 25 kV HV rectifiers (one to generate a positive voltage ...
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1answer
60 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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1answer
54 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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2answers
67 views

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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1answer
53 views

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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2answers
85 views

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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2answers
25 views

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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1answer
62 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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