Questions tagged [full-bridge]
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0
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2answers
96 views
Incorrect operation of the Allegro A3941 driver
I use the Allegro A3941 driver in these modes:
At very low duty cycle (<10%)PWM motor consumes 0.05 A and produces a squeak. If you increase the PWM duty cycle of the PWM to 10% the squeak ...
2
votes
3answers
186 views
Why is this camping light deadly?
I am learning, so go easy on me, if you can.
In a video with BigClive, he takes apart a camping light and says it's deadly when you have mains plugged in and usb plugged in at the same time. In that ...
2
votes
1answer
109 views
How to select high frequency rectifier capacitor?
Can I use aluminium electrolytic capacitor after a full bridge rectifier?
My operation frequency is 200 kHz with output voltage of 100 V.
Based on this paper: "Analysis and Design of Load-...
1
vote
1answer
40 views
SG3525 Closed Loop Inverter Waveform Problem
I'm using a sg3525 ic on a full bridge dc-dc converter in closed loop. The system is working fine, I don't have a problem with it. Output is just like what I want.
The problem is inverter part's ...
0
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1answer
54 views
3 Phase calculations
I have 3-phase utility mains power supply whose phase voltage is 220 V, 50 Hz.
I keep getting confused about various calculations of the 3-phase mains as follows:
Formula for the line voltage.
...
0
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1answer
259 views
Smoothing cap vs filter for full wave bridge rectifier circuit
I am designing a circuit which requires high-voltage DC. My plan is to step-up my mains (120VAC) with a transformer and then pass that through a FWB. After the FWB, I want to smooth the signal into a ...
3
votes
2answers
298 views
Single Phase Full Bridge Inverter - I Can't figure out which PWM Control Technique is used
I have the following Single Phase Full Bridge Inverter and a PWM control method which in my language is called "asymmetric mode". I understand how it works but I can't find any documentation written ...
0
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1answer
74 views
How does flux change polarity in full bridge SMPS transformer?
Take a full bridge switching circuit connected to the primary of a transformer.
Assume:
No load on secondary.
Voltage into full bridge is DC.
Duty cycle of switching is 50%.
At t = 0, full bridge ...
0
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2answers
172 views
LTspice- Huge current spikes across MOSFETs in full-bridge inverter
I have designed a simple full bridge inverter in LTspice. The outputs for voltage and current are as expected however I have huge current spikes across the MOSFETs which I am using as switches and are ...
0
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2answers
65 views
Does using voltage regulator in power supply further reduces the rippling?
I want to build a 12 V DC power supply. Which one is a better approach?
If I have a step down transformer 220/12 volt and after doing its full wave rectification and smoothing its wave using ...
-2
votes
1answer
191 views
Best way to convert 48VDC to 220VAC Pure Sine
I'm trying to convert 48VDC(input could be battery or not), to 220VAC(Sine)
I've searched a lot and found different topologies so I'm not sure about which one to use.
I'm expecting to have a 1600W ...
0
votes
1answer
403 views
RC snubber on bridge rectifier (capacitor rating)
I am using a bridge rectifier on the mains and across each diode I have placed a RC snubber for EMI mitigation. (C is rated at 1Kv)
My question is...on the C (from the RC snubber) should I use Y or X ...
0
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0answers
31 views
How can I drive a bridge with three states and two high-side switches?
I want to drive a configuration similar to the one presented in Figure 1 of A novel tri-state boost converter with fast dynamics, but use a MOSFET instead of the diode for efficiency.
I want to put ...
0
votes
1answer
117 views
AC to DC power supply using full wave rectifier with 4 outputs
I simulated the circuit below with multisim and got the required values.
[![enter image description here][2]][2]
1.25 to 22V using the poistive regulator
-1.25V TO -22V using the negative ...
0
votes
1answer
55 views
How can a constant secondary side current cause a primary current to flow in a transformer?
This is a question which was originally asked by my power electronics professor but left unanswered.
Suppose you are given the following system (kindly borrowed from this question)
Suppose that:
...
1
vote
1answer
92 views
What does PA1 do in this schematic?
Original document:http://www.st.com/content/ccc/resource/technical/document/data_brief/group0/95/79/2a/ed/d0/a0/4f/46/DM00263698/files/DM00263698.pdf/jcr:content/translations/en.DM00263698.pdf
The ...
0
votes
1answer
70 views
How does a filtering capacitor smoth a changing current? [duplicate]
Lets assume,in picture blow, the current be in its peak voltage moment. then when the current begins to fall (assume a moment after the peak moment) we know the current is blocked by diodes (actually ...
4
votes
2answers
2k views
Smoothing a Full-Wave rectifier voltage
I was reading about full-wave rectifiers and came across the schematics below which the capacitor C can smooth its voltage, but I didn't understand one case:
We know that when the rectifier's voltage ...
2
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3answers
5k views
Connecting Voltage Regulators 7812 in Parallel for High Current [duplicate]
Could I use two L7812 voltage regulator ICs in parallel to get 12 volt and more current that with just one?
0
votes
1answer
91 views
Mistake in reading a rms voltage
I got a really strange result. I've build a full-bridge rectifier with a capacitor filter. And I used the following values \$\text{C}=500\cdot10^{-6}\$ and as a load \$\text{R}=1000\$. The maximum ...
0
votes
1answer
102 views
Battery charger filter circuit
I'm working on a project where I have to make a powerfull battery charger. And someone I'm working with told me that it is a good idea to have mains voltage connected to a full bridge rectifier and ...
1
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0answers
83 views
Calculating dissipation of a CCR powered via a full bridge rectifier
I'm putting together a string of UV/purple LEDs for photoetching purposes.
The idea is the following:
simulate this circuit – Schematic created using CircuitLab
The 80 LEDs are in series, ...
3
votes
2answers
261 views
Why do I get high DC current in grid tied inverter output?
Edit: Added gating signal waveforms. Changed some of the graphs, I accidentally put a test circuit waveforms the first time. Current is not that high but offset is there and current is high for a ...
0
votes
1answer
56 views
Current limiting resistors for preventing shorts at power supply turn-on [duplicate]
In a text it mentions about a power supply that the filter cap will act as a short at initial turn-on. Below I showed these points as A and B:
In this case, the diode will have a surge current Is. ...
0
votes
1answer
11k views
Derivation of ripple factor equation for a full-wave rectifier with filter
I'm trying to derive the ripple factor for a full wave rectifier with a filter.
This parameter is defined as the ratio of the root mean square (rms) value of the ripple voltage (Vr_rms) to the ...
0
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1answer
1k views
Load cell temperature compensation
Can someone explain to me how this (as advertised) full bridge load cell works?
I'm aiming for good temperature stability and I understood a full bridge load cell configuration should reject error ...
0
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0answers
238 views
Full Bridge Inverter with transformer, source current waveform
I intend to make a 750W DC/AC inverter working with a 24V DC supply. I have simulated the circuit in MatLab using PLCECS toolbox.
Here i use a 50kHz carrier to generate a 50Hz modulated unipolar PWM ...
0
votes
2answers
705 views
Full Wave Rectifier and 7805 Regulator
I have make a full wave rectifier and aimed to obtained +9V, -9V and +5V DC from an AC transformer (I have diplayed output of transformer only as AC1 and AC2) as i have shown below.
However, when i ...
0
votes
2answers
253 views
Full Wave Rectifier Ripple Problem
I have made a full wave rectifier circuit to obtain 5VDC, 9VDC and -9VDC. To prevent the ripple, i have selected C1 and C2 as 4uF which were shown below. I will use a 12V, 6W transformer to get AC ...
0
votes
1answer
269 views
Negative charge pump problem
I have an 18V 1.5A mains transformer (outputs around 30V peak with no load at 50Hz) followed by a full-bridge rectifier and a filter capacitor:
(there would be a schematic here if SE allowed me more ...
-1
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2answers
202 views
**VGS** of upper MOSFET disappears after turning on supply voltage [closed]
Why does VGS of upper MOSFET in either leg of full bridge drop when the supple voltage across the drain terminals of the upper MOSFETS gets turned on ?
The half bridges separately work perfectly fine ...
-1
votes
1answer
471 views
Gate driver IR2110 doesn't work - Full bridge [closed]
I am using two gate drivers (IR2110), each driving a phase leg of the full bridge. Everything has been wired up according to the datasheet http://www.infineon.com/dgdl/ir2110.pdf?fileId=...
0
votes
1answer
654 views
IR2110 incorrect output waveform from input waveform
I have a problem that is bothering me for weeks, after frying a couple of MOSFETs and (expensive) IR2110 ICs, I still have no clue. Note that I am still a beginner when it comes to this.
The project ...
-1
votes
0answers
754 views
High Side MOSFET failure in Full Bridge DC to DC Converter
In full bridge dc to dc converter , when i tried to turn the converter with 1 A load at the output with 48 volts input voltage , converter suddenly stopped working . After invistagation both high side ...
1
vote
3answers
352 views
what kind of three phase full wave rectifier should we use?
We have the following generator: Permanent Magnet Generators. For the project we would like to use this converter. Between this generator and converter we've to convert the three phase voltage to an ...
-3
votes
1answer
128 views
How to get a +15v&-15v DC from variable AC source using Full-wave rectifier? [closed]
How to get to DC voltages (+15v & -15v) by using Full-wave rectifier, and if I change the AC source, the output stay stable, i.e Independent on AC source...
any help?
.....
I want to change AC ...
0
votes
1answer
212 views
Common mode filter
I was wondering, after reading this question:
Common mode filter, Where do you decide to put the filter, at the in- or at the output? Do you just look at the current and place it where the current is ...
0
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2answers
339 views
Why do we need galvanic isolation with low power components?
This is an analog to digital converter with I2C communication from a project (350W power supply) by ti instruments. it senses line and pfc voltage and communicates with the MCU. I don't understand ...
0
votes
1answer
221 views
Somethings about Infineon BTN8962
I want to design a BDC driving board with Infineon BTN8962.(Infineon BTN8962 is a half of H-bridge IC)
As we all know,BDC driving circuit is just like this:
In this picture,We set a High side MOS(QA)...
1
vote
2answers
5k views
LC Filter for a Full Wave Bridge Rectifier?
According to what I've read on a few websites and PDFs (http://www.irjes.com/Papers/vol2-issue6/Version-1/E02064249.pdf is an example) using an inductor-capacitor filter to assist AC to DC ...
7
votes
3answers
422 views
How to improve the full bridge / half bridge start up time?
I am trying to find out a way to improve the rise /start up time of a series LC circuit placed in a full bridge (or half bridge) circuit.
Here is a simplified schematic. The circuit works very well, ...
1
vote
1answer
799 views
Voltage spikes with ZVS full bridge
I am designing a DC/DC converter. I chose the fullbridge topology.
The requirements are as follows:
Vin = 75 - 125 Vdc
Vout = 200V
P = 600W
Fs = 100 Khz
The basic schematic is as follows:
I use ...
0
votes
1answer
2k views
Capacitor Sizing for A Full Wave Bridge Rectifier?
Building my understanding of the issue from (First PSU - need help with capacitor size) (especially the comments/ripple wiki/several capacitor sizing webpages) the calculation for rectifying a full ...
0
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1answer
917 views
Reactive power in single phase controlled full wave bridge rectifier
How to calculate the reactive power,Q (VAR) in single phase controlled full wave bridge rectifier with only R-load? The sample observations of the experiment are given in the image. But I am wondering ...
1
vote
1answer
269 views
IR2110 - measuring Vb to Vs kills MOSFET
I got a new digital oscilloscope as a gift. As a training course, I observed some waveforms of my test 12V full bridge circuit that is driven by TL494 and two IR2110 operate the IRF3710 100V mosfets. ...
2
votes
1answer
316 views
Why would someone prefer halfwave rectifier over bridge rectifier? [duplicate]
The other day, out of curiosity I was measuring the current wave shape of a laptop charger. The wave shape indicated a spike only in one half cycle. I'm guessing half wave rectifier here.
One thing ...
0
votes
1answer
257 views
Powering an LED with a 170VDC Full Bridge Rectifier
I am currently in the process of designing a Tesla Coil and am stuck at the Full Bridge Rectifier and have some reservations about what I propose to do. Currently, the circuit looks like this:
I ...
0
votes
1answer
2k views
LTSpice Full Wave Controlled Rectifier Erronous SCR Breakover
I'm attempting to simulate a full wave SCR rectifier:
However it is not behaving correctly. In my setup V3 controls one pair of SCRs, and V4 controls the other. All the math on the side is just for ...
5
votes
4answers
2k views
Full bridge HVDC to modfied square sine - random half side MOSFET burn
I am trying to make a step-down 350V to 220V voltage converter. I decided to go with rather simple circuit of full bridge MOSFET inverter since my loads are only resistive or switched.
I had built it ...
8
votes
4answers
2k views
Why does current flow from the most positive to the most negative in three phase system?
I put the following circuit in a simulator to see how it works. I understood it but I have a question:
At the time of the vertical green line, The simulator shows me that the current flows from the ...
