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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70 views

Why is the capacitor filter in parallel with the load and the choke in series in a choke input filter?

What will happen if we interchange them? In a capacitor filter, the capacitor discharges through the load, it was connected in parallel to load. From what I have concluded, if the capacitor is in ...
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3answers
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Transformer - 2 Wires in and 3 wires out - How to connect ground?

I have the following transformer: And the following power cable: This is for a dual-polarity power supply for some audio circuits. How should I connect the ground pin to this circuit? Can the ...
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2answers
49 views

How is the peak inverse voltage of diodes in a center tapped rectifier twice than the bridge?

I am not able to understand how the PIV becomes twice in case of centre-tapped rectifier. PIV is the maximum inverse voltage that a diode can handle before having a breakdown. For a half wave ...
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How does this circuit act as a half wave rectifier?

I'm having trouble to understand how this circuit operates exactly. The op amp is an LM339 from ST (datasheet link). The circuit in question is as follows: The op amp should be a comparator, but the ...
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5answers
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Can a diode bridge be connected to a high input voltage?

I'm trying to rectify an AC current at 220V. Many written tutorials don't mention any transformer before the diode bridge and many video tutorials use transformers that provide an output of 6V or more....
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Diode ratings question

Can I use a 1000 V, 3 A diode instead of a 400 V, 3 A diode? The dead diode is a uf5404, it was in a satellite receiver power supply. The only ones I can find in the market are fr307 and 1n5408. Here'...
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2answers
121 views

Do all AC-DC converters produce current spikes in input?

I am designing a simple rectifier circuit with LTSpice (I am planning to build one for myself) and I found out that AC-DC converters require PFC circuits to prevent huge input spikes (?). I tried ...
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68 views

Current and voltage driven rectifiers

While going through resonant DC-DC converters, I came across two types of generally used rectifiers. The above image is current driven rectifier and it makes sense why one wants to drive it with ...
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How does voltage distributes in full wave rectifier with resistive load?

I am a bit confused with how voltages distribute themselves in the circuit, for the positive cycle the diodes D1, D2 are turned on. We have positive input voltage terminal connected to D1's anode and ...
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1answer
52 views

How would the negative input voltage affect the output of series diode capacitor circuit?

I am trying to understand the output waveform of this diode in series with capacitor circuit and I am using the constant voltage source model for diode. I will recount what the professor has told in ...
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4answers
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Single-sided rectifier with low pass filter

I'm having some troubles with this simple circuit where Vi is a sinusoidal signal. If you consider that the initial voltage across the capacitor is 0 V, then until Vi reaches 0,7 V the diode behaves ...
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What is the role of D2 and D3 in this circuit?

Explanation of the circuit : This is a simple battery charger based on SCR is shown here. Here the SCR rectifies the AC mains voltage to charge the battery. When the battery connected to the charger ...
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Why does the output voltage of this single phase semi converter ignores the voltage provided by the second thyristor?

Here is the circuit: The first and second circuits are equivalent except that the first one has a capacitor in parallel with the load, i'm trying to smooth out the output voltage. The triggering ...
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Does Alternator Self-Excitation Require Rectification?

I am learning about self-excitation in alternators. My understanding is that there is residual magnetism in the rotor. As it spins, this generates a current in a stator which is then fed to the (...
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3answers
85 views

Connect rectifier to DC power source? [closed]

I'm thinking about DC appliances and energy efficiency. A common appliance like an air conditioner has a rectifier to convert 230V AC into 50V DC. If I connect the appliance directly to 50V DC instead ...
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1answer
52 views

Which circuit to maximize power at regulated 3V3 DC from low power 6VAC/20mA source?

The power output of provides a guaranteed 6VAC/20mA/50kHz minimum output into a resistive load with fluctations possible up to 12VAC. Other loads are not specified. The output impedance is not ...
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KBPC5010 voltage rectifier

I bought this voltage rectifier, this should be a simple Graetz rectifier, however, there are 2 strange issues I run into: The output DC voltage is higher than the input AC voltage. Why? For example ...
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Engineering specs for converting AC to DC

I’m experimenting with electricity generation. I am generating 110V AC, wattage and amperage unknown (after a step down transformer from 400V), and I want to rectify the AC into around 130V DC to run ...
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68 views

What is a full-wave bridge rectifier with capacitor filter and voltage divider? [closed]

What is a full-wave bridge rectifier with capacitor filter and voltage divider? Just a simple definition and an example will do.
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Ideal diode for 0-5V range for measurement circuit

I am building a measurement circuit that measures the voltage/current from a thermogenerator. The expected measurement range (and therefore input voltage range) is 0-5V. I plan to measure it with a ...
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3answers
193 views

The use of capacitors in voltage regulator schematic using 7805 and 7812?

I'm a newbie in electronics so I lack a lot of basic electronic knowledge. I found this schematic about making regulated power supply 5 V and 12 V DC from AC. The diagram is below: This is what I ...
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2answers
113 views

Ultrafast rectifier diode: how can I calculate the maximum frequency?

I built ESC that had a 1N4007 as flyback diode. It was destroyed because my ESC was working with high PWM frequency. I replaced the 1N4007 with BYV29 ultrafast rectifier diode. The result was good ...
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1answer
83 views

Making a battery charger polarity-independent

I am trying to make a battery charger: simulate this circuit – Schematic created using CircuitLab In this configuration the polarity of the voltage doesn't matter the battery will be charged ...
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3answers
63 views

Why is a secondary transformer winding for VT filament heater connected to rectified output? [duplicate]

Ok I know this is a pretty narrow question. I'm learning about vaccum tubes, and I think I have the basics down, but this particular setup is confusing me. See the attached picture. In the given ...
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1answer
61 views

Does differing mains frequency affect DC motors?

I moved a large, high-quality kitchen appliance (a stand mixer) intended for use in North America to the UK. To operate it without damage to the motor, I will need to (at least) convert the voltage ...
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1answer
74 views

Industrial SCR rectifier/battery charger circuit: best place for blocking diode, reverse diode, and dropper diodes?

I am working on a three phase 110 VDC & 100 A SCR rectifier/battery charger. I'm not sure which one of the circuits in the image is better for filter and diodes. Please help me with these ...
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3answers
106 views

AC to DC converter/rectifier huge input current spike

A simple rectifier circuit results in huge AC input current surge. As I understand it, it is because of the capacitor on the output. How is this problem solved? A resistor on the capacitor? A current ...
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1answer
67 views

Capacitor discharges in rectifier circuit

Is the diode that discharges the capacitor when it cut the current or the discharges of the capacitor that block the diode? simulate this circuit – Schematic created using CircuitLab The diode ...
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Are three-phase bridgeless boost, three-phase totem pole and active 6 switch rectifiers different names of the same topology?

I keep coming across these topologies in several references and they look similar but the names are used interchangeably. I wish to know if these are same, and if not, what is the difference between ...
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2answers
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Best diode for very high frequency (Vacuum?)

If we look at what's commercially available, the diodes with the highest maximum frequencies I can find are in the low GHz range, of the Schottky type. I can also find research papers detailing ...
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3answers
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How to determine value of a smoothing capacitor

A friend (who knows even less about electronics then me!) asked me if I could build a circuit that can convert 8v 50Hz AC into a DC power supply so he can power a small board that is normally driven ...
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1answer
74 views

Transformer design, 120 Vac to 350 Vdc

I am trying to design an AC-DC boost converter, from 120 VAC to 350 VDC. I believe the transformer design is giving me a lot of issues. This is the code that I wrote to find the values that I need.: <...
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116 views

Why Rectifier does not short circuit?

Why in a rectifier circuit the current does not go through the diodes marked with the question marks in the picture and create a short circuit when the current is returning from the negative side of ...
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1answer
193 views

How to calculate the real output voltage of a rectifier circuit (center tapped rectifier)

In my class, we are using Proteus 8 to simulate simple rectifier circuits. We are not familiar with analog electronics yet. Since the class is all about using engineering software, there are not many ...
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2answers
226 views

How is a line commutated inverter different from a grid-following inverter?

The U.S. Department of Energy provides this definition of a line commutated inverter: An inverter that is tied to a power grid or line. The commutation of power (conversion from direct current to ...
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62 views

Why doesn't the Potential Difference reading start from zero

While I was running a simulation of a center tapped transformer with and without a filter on Matlab I noticed something strange. The potential difference across the load doesn't start from zero and I ...
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2answers
162 views

How to calculate efficiency of a rectifier with a capacitor filter

I was reading on rectifier circuits and I found out the efficiency of a center tapped transformer is the average power Pdc divided by the rms power Pac and if the resistance of the load is known then ...
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1answer
83 views

In Chinese Led torch how does the LED automatically light down when recharging? [closed]

I repaired some led rechargeable torches which work under 230 V. When we plug it to main socket for charging even with the switch on, the LED goes off. What mechanism in these torches to off the LED ...
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58 views

Reduce the effect of half wave rectifier on transformer

I have an electromagnetic feeder drive which is supplied from a transformer. When I see the catalogue of the drive I noticed it using just the positive pulse of the AC source (half wave rectifier.) ...
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1answer
63 views

Power of three phase rectifier

I'm confused about what type of voltage should I use to calculate the power of a three phase rectifier. For a signal like this: I've read it should be called pulsating DC. If I want to calculate the ...
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1answer
65 views

Rectified signal from three phase rectifier circuit

I'm trying to simulate this circuit This is the implementation I'm getting this output signal, that is close to what you would expect from a rectifier. In this image α = 0, α1 = π/6, α2 = 5π/6 and ...
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1answer
60 views

Three phase rectifier with thyristors not working as expected

I'm trying to simulate the following circuit with a resistive load: The control circuit provides three signals, and are the turn on signals for the thyristors: the first one (yellow) α1 = α + π/6: ...
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1answer
41 views

Three phase RL circuit voltage and current wave form?

In the case of this three phase rectifier I know the voltage for a resistive load is this (In black): With the diodes turn on/off for each point, there's a change in the line-line voltage. I think ...
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2answers
80 views

Honda CBX 1979 Regulator/Rectifier - Lipo (lifepo4) battery

I exchanged the OEM battery (PB) of the CBX 1000 motorcycle with a Lifepo4 12V battery. It is smaller, lighter and has a much better CCA. However, the connector (wires at the bottom side of photo) ...
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1answer
65 views

High current "booster" circuit with 2 outputs?

I need a 2 kind of voltage for my project - 24V/2A and 5V/2.5A, and I found that a good way to ensuring high current with 78xx is to add a bipolar transistor - I wonder if I connect two such current ...
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86 views

More than sqrt(2)*AC after the rectifier. Why?

I encountered the following issue: supplying one working PCB with two different transformers (same model), the voltages on the PCB are different (higher!), even though the output voltages of the ...
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3answers
114 views

Why are all the phases connected together on this old alternator

I got my hand on an old car alternator. I can't figure out how it works. What bugs me is that it look like all the phases (and neutral) are connected together right at the output of the stator coils. ...
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1answer
84 views

LTspice - Inaccurate Center-tapped Full Wave Rectifier Results

this is my first post so I apologize if I do not follow any sort of convention. I have researched how Center-Tapped Full Wave Rectifiers should work and from what I found, when the turns ratio is 1:2, ...
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1answer
45 views

Determine the switching mode PS/adapter 12 or 24 V [closed]

How, by looking up components inside, to determine the switching mode PS/adapter is max 12 V or 24 V?
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What could be burning the schottky diode in this synchronous rectifier?

I have this TV PSU which has one supply circuit for the TV motherboard, which it calls "standby" in the scheme (AO3). Here's a portion of the AO3 circuit where most of the components I'll ...

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