All Questions
187 questions
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54
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Diode SPICE model for the HSMS-2860 in CST schematic
Trying to create diode in CST schematic but getting this error.
Use same values and import it in CST as .lib file (notepad file names as .lib). Transmission lines used for impedance matching.
...
- 1
2
votes
2
answers
135
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Simplest way to find peak capacitor voltage in this circuit?
I'm curious about how the circuit diagrammed below can most easily be analyzed without the use of a circuit simulator -- the old fashioned way, by hand.
All I'm interested in calculating is the ...
- 31
0
votes
2
answers
128
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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 ...
- 27
1
vote
1
answer
76
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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. ...
- 13
1
vote
3
answers
127
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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. ...
- 13
-4
votes
2
answers
330
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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 ...
- 19.5k
1
vote
2
answers
201
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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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1
vote
2
answers
61
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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?
- 33
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0
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45
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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 ...
0
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0
answers
96
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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 ...
0
votes
2
answers
120
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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 ...
- 13
0
votes
1
answer
35
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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 ...
- 373
1
vote
0
answers
113
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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 ...
- 151
0
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0
answers
102
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The way I compute the LC element of the EMC filter using the impedance paper
I am an embedded system engineer. I am not very familiar with the hardware aspects. I am working in the field of embedded systems in C language and I started a project on designing a power supply ...
- 13
11
votes
4
answers
5k
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If multiple sources are parallel with the diode, why does the one with a higher voltage turn on?
I've found this combination in many devices—for example, power supply redundancy modules, Ethernet-powered devices (PD of PoE), and RTC in circuits. In this circuit, the voltage source with a larger ...
- 2,519
0
votes
2
answers
123
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Double Valued Voltage in Rectifier with Capacitor Filter
When a capacitor is charged in a full wave rectifier, as shown below, the load voltage closely follows the AC input voltage, less some 0.7V. When the input voltage falls from its peak, the voltage ...
0
votes
2
answers
299
views
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 ...
- 445
2
votes
2
answers
100
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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?
- 21
2
votes
1
answer
595
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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 ...
- 65
6
votes
2
answers
506
views
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 ...
- 61
1
vote
2
answers
1k
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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 ...
- 11
0
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1
answer
519
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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. ...
- 69
1
vote
0
answers
64
views
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 ...
- 755
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1
answer
138
views
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.
- 11
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votes
1
answer
54
views
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 ...
- 3,156
3
votes
2
answers
111
views
Rectifier diode specs not clear
https://www.tme.eu/Document/e6d16d51cc343d73832bf32cc9d69d1f/p2500a.pdf
How does that "RthA < 4 K/W 1)" work?
...
- 1,061
7
votes
3
answers
1k
views
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 ...
- 409
0
votes
1
answer
376
views
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?
- 541
1
vote
1
answer
1k
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What is a field effect rectifier diode (FERD) and what is it used for?
I was searching DigiKey for a particular type of diode, and found field effect rectifier diode (FERD). What are they used for?
- 2,980
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2
answers
178
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On a 12 V car alternator with possible failure of the rectifier diode causing drainage, could an electronic component be added in-line near battery?
On a 12 V car alternator with possible failure of the rectifier diode/s causing drainage, could an electronic component be added in-line near the battery? Such as a voltage regulator or diodes in line ...
1
vote
2
answers
119
views
What will the output voltage will look like if we have non sinusoidal AC paired with capacitor?
I am currently studying for exam and a lot of questions are popping up in my head.
What will Uout of a full wave bridge rectifier with a capacitor look like?
I am talking about square, trapezoidal, ...
- 13
2
votes
1
answer
350
views
Why aren't smoothing capacitors used in smoothing the output of fully controlled bridge rectifiers?
I was wondering why smoothing capacitors are not used in smoothing the output of fully controlled bridge rectifiers, like it is used in the uncontrolled bridge rectifiers.
- 366
3
votes
1
answer
232
views
Noise of a precision/active rectifier
I am trying to build a precision rectifier circuit to implement AM demodulation in a sensor signal chain.
For now I have calculated the sum RMS noise of the total signal chain except that of the ...
- 31
1
vote
0
answers
405
views
What is a field effect rectifier diode
ST offers what they call field-effect rectifier diodes. Does anybody know what that actually is and how they work?
Application wise it seems very similar to a Schottky diode (low voltage drop,) but ...
- 535
0
votes
2
answers
338
views
Which replacement standard recovery diodes do I use for a high voltage full bridge rectifier in a valve guitar amplifier?
The original diodes were four IN4007 (1A 1000V PRRV.)
If I replace them with IN5408RGL (STANDARD DIODE, 3A, 1KV PRRV,) basically upping the current to 3A, will this have any detrimental effect on the ...
- 1
3
votes
3
answers
305
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Not able to figure out the logic behind sense circuitry of a AC/DC converter
In the below circuit, why would there be 2 extra diodes (D3 and D4) to sense AC input voltage?
If D3 and D4 act as rectifier, wouldn't it be sufficient to directly sense at the output of bridge ...
- 3,156
3
votes
3
answers
309
views
Half-wave rectifier- How does the supply line current affect a transformer
i Have this half-wave rectifier circuit. i have placed a current probe on the input in order to measure the waveform of the supply current. The waveform is shown below. My question is what effect does ...
0
votes
2
answers
2k
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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 ...
3
votes
5
answers
2k
views
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....
- 147
1
vote
1
answer
404
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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'...
- 11
0
votes
2
answers
165
views
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 ...
- 33
0
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1
answer
358
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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 ...
- 33
1
vote
4
answers
800
views
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 ...
- 111
0
votes
2
answers
266
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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 ...
1
vote
2
answers
1k
views
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 ...
- 19
0
votes
0
answers
47
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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 ...
- 1
0
votes
0
answers
232
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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 ...
- 1
2
votes
2
answers
530
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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 ...
- 131
0
votes
1
answer
581
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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 ...
- 11
0
votes
2
answers
788
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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 ...
