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14.12.2014
Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. I am trying to make a push pull dc-dc converter from 12vdc to 400vdc for an inverter with a center tapped transformer connected to battery of 12vdc. As can be seen in the figure, there is severe ringing in the drain waveform of the two MOSFETS. Now my question is, If I add a passive RCD snubber between the drain and source of the mOSFETs, will that be sufficient to get a good 'square' wave shape on the secondary??
The reason I thought of asking this was because I saw that the other question shows a clean wave, I mean, the drain wave is flat for the most part, except the small period after the MOSFET shuts off, which could be removed by using a snubber. You sometimes have to be concerned about them both but it is usual that the high speed ringing is the one which attains the higher peak value and this is the one that can damage the MOSFET. Not the answer you're looking for?Browse other questions tagged dc-dc-converter converter ringing or ask your own question.
If we had a "perfectly efficient" computer and all the energy in the Milky-way available, what number could it count to? Ringing ears and tinnitus are the same thing, but tinnitus is usually used in more severe cases. I think this was a common issue for the war folks back in the 40′s but its in full swing again for sure.
Tinnitus is,”a condition in which people hear constant or periodic sound not caused by an outside source. This is a ringing that sets in after excessive noise exposure, such as in a rock concert (being too near the speakers) or the explosion of a firecracker.
Before we get into what causes ringing in the ears, it’s important to know who is at greater risk of the problem. According to the Hearing Health Foundation: Roughly 90 percent of tinnitus cases occur with an underlying hearing loss. It’s estimated that up to 90% of cases of tinnitus are the result of prolonged exposure, which can lead to noise-induced hearing loss.
The more noise you’re exposed to, the more damage the cochlea takes, and the more your hearing is reduced.
According to PDR Health, exposure to more than 60 seconds of noise louder than 110 db can cause hearing loss. If there is a tumor growing in your ear, it may press on the auditory nerve (which sends signals to your brain). If your ear is blocked due to ear infections or wax buildup, these blockages may press on your auditory nerve, to the same effect.
Other parts of your ear may also lose function, or may start detecting signals that they aren’t receiving.
Aspirin is one of the many types of drugs that can cause a ringing in your ears, along with quinine medications and a number of anti-inflammatories, antidepressants, antibiotics, and sedatives. This is a disease that causes the small bones in your middle ear to stiffen, thus reducing their function.
The result of this disease is hearing reduction and loss, and thus may be the cause of the ringing in your ears. If you sustain traumatic injuries to your head or neck, the resulting inflammation can place pressure on the auditory nerve.
Neck and jaw problems like temporomandibular joint syndrome can also lead to a ringing in your ears. RELATED:  How to Clean Earbuds and Why You Should Do It?Even eating certain foods can increase the ringing! All of these things may be the cause of hearing loss, and thus may be the reason that you hear ringing in your ears. As the information above shows, the ringing in your ears is likely related to hearing loss or serious medical conditions.
Note: You want to have the real root of the problem diagnosed and treated specifically, so home remedies are NOT the way to go. In order to treat the ringing in your ears, your doctor will try to find out what is causing the problem. If it’s due to a buildup of ear wax or impacted ear wax, removing the wax can solve or improve the problem. Note: To prevent the buildup of ear wax in the first place, consider getting into the habit of using the Oto-Tip to clean your ears at home.
This may include medication to suppress the disease, surgery to remove a tumor or repair the inner ear, and other treatments. Basically, the doctor will look for what’s causing the problem, and deal with it rather than trying to just stop the ringing.
While there are drugs that can cause tinnitus, there are others that can help to reduce the risk of complications or even mute the ringing in your ears. Sold under the names Xanax and Niravam, this medication can help to reduce the ringing in your ears. This includes both nortriptyline and amitriptyline, which have been used to treat severe cases of tinnitus. While the doctor is treating your tinnitus, he may recommend something to help you deal with the ringing in your ears.


Constant ringing in your ears can be quite hard to cope with, but the information above will make it easier to understand what’s going on. Get treatment now, and you may be able to prevent the hearing loss that is causing the ringing in your ears! What causes hearing loss?Losing your hearing is a normal and inevitable part of the ageing process. Action on Hearing Loss: Enjoy the sparks but avoid the ringing in your ears this bonfire night.
Michael Rothschild, MD, director, pediatric otolaryngology, Mount Sinai Medical Center, New York. National Institute on Deafness and Other Communication Disorders, National Institutes of Health. To provide even greater transparency and choice, we are working on a number of other cookie-related enhancements. Leakage inductance in the transformer interacts with mosfet drain capacitance and when the mosfet open circuits there is a parallel tuned circuit with remnants of energy in the leakage inductance and you naturally get a decaying sinewave. The high spike that is at the beginning and end of the drain wave shape, at the start and end of the gate pulse, that I understand.
The high spike is the dangerous one - that is due to a gap in time betweeen one mosfet turning off and the next one turning on - that spike could reach hundreds of volts and must be suppressed.
In addition to dozens of medical disorders it can also be caused by a few common and easily remedied conditions. The sound can also be described as a ringing, buzzing, or clicking noise that occurs inside the head. Loud noise damages the cochlea, the spiral-shaped organ in the inner ear that is HIGHLY sensitive to noise.
It can lead to malfunction of this sensitive inner ear organ, affecting your hearing and thus causing the ringing in your ears. This automated spinning swab cleans the wax from the ear without pushing it deeper into the canal. However, side effects include blurred vision, dry mouth, constipation, and even heart problems!
This will reduce the irritation of the ringing, improving your quality of life as the doctor searches for the root of the problem. They can reduce the irritation of the ringing, or allow you to live a healthy, happy life despite the ringing.
Now that you know what the ringing is, what causes it, and how to deal with it, it’s time to pay your doctor a visit. Action on Hearing Loss (formerly RNID) says more than 70% of people over the age of 70 have some degree of hearing loss.
It is intended for general information purposes only and does not address individual circumstances. The tinnitus will usually clear up on its own, and will last anywhere from minutes to hours.
All of these people are at a higher risk of developing tinnitus for one simple reason: they are more likely to suffer from hearing loss. While there are home remedies for most of the diseases and disorders mentioned above, they won’t do the job as well as a doctor.
Cleaning with things that do push wax deeper into the ear canal is currently how some of those large wax buildup plugs are formed.
However, while many of us will experience gradual loss of hearing over the years, noise exposure at home, work or leisure can also cause impairment.
It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health.
But what about the big ringing with comparatively low frequency, that resides between these spikes? The difference between tinnitus and for example, the mosquito ringtone, is hard to explain in words. If you are experiencing ringing ears it may not be a permanent annoyance, but one that can be cured by following the advice of an expert. It's estimated that 10 million people in the UK – that's one in six - have some level of hearing loss. Never ignore professional medical advice in seeking treatment because of something you have read on the BootsWebMD Site. When experiencing tinnitus, it almost sounds and feels like it’s coming from inside your head itself.
Rather than treating tinnitus itself, tinnitus treatments work by treating the underlying disorder that is causing your tinnitus to occur. Loud noise at workExposure to continuous loud noise during your working day can make you permanently hard of hearing in the long term.
Jobs that are hazardous to hearing include construction, the military, mining, manufacturing, farming or transportation.
The Health and Safety Executive says employers have a duty to protect employees from hearing loss.
Tinnitus usually goes hand in hand with hearing loss, at least to some degree and is actually a symptom of any number of disorders rather than a condition itself.


Injury damage or pressure changesTrauma to the head can impact the ear and cause permament hearing loss.
Sudden pressure changes, like scuba diving or flying, can also harm the eardrum, middle ear or inner ear. While eardrums may take a few weeks to get better, serious inner ear damage may require an operation.
These are called ototoxic drugs, which may cause damage to the inner ear, resulting in hearing loss, balance problems and tinnitus. Antibiotics linked to possible permanant hearing loss include: gentamicin, streptomycin and neomycin. Chronic diseaseSome chronic diseases that are not directly linked to ear issues may trigger hearing loss. Some types of hearing loss are also linked to autoimmune diseases like rheumatoid arthritis. How you hear – anatomy of the earSound causes the eardrum and its tiny attached bones in the middle part of the ear to vibrate. The spiral-shaped cochlea in the inner ear transforms sound into nerve impulses that travel to the brain.
The fluid-filled semicircular canals attach to the cochlea and nerves in the inner ear and send information on balance and head position to the brain. Growths and tumoursHearing loss can be caused by benign, non-cancerous growths, such as osteomas, exostoses or polyps that block the ear canal.
A large neuroma can cause headaches, facial pain or numbness, lack of limb coordination and tinnitus. Loud bangs!Remember, remember the 5th of November – but also remember to take care of your ears on Bonfire Night! Exposure to loud noise over 85 decibels can cause permanent hearing loss and while fireworks are lovely to watch, some can break that sound limit with a searing 155 decibels. Gunshots and other explosive noises also pack a punch to your ear, in some cases rupturing eardrums or causing damage to the inner ear. Loud concerts and tinnitusThat loud buzzing sound in the ears after a loud concert is called tinnitus. The average rock concert exposes you to sound as loud as 110 decibles which can do permamant damage after just 15 minutes. Other noises that break the 85 decibel range and risk permanent hearing loss include power tools, chain saws and leaf blowers.
Prevent tinnitus and potential hearing loss, which can last days, months or years by using earplugs and limiting noise exposure.
Personal music playersIf other people can hear the music you're listening to through your earphones, you may be at risk of permanent hearing loss.
A recent survey revealed that over 92% of young people listen to music on a personal player or mobile phone. Recent EU standards limited the sound on these devices to 85 decibels, but many listeners plan to override the new default volume – saying they want to wipe out background noise.
Action for Hearing Loss suggests using noise-cancelling headphones rather than pressing override and risking lifelong damage to your hearing.
EarwaxIt may be yucky and unsightly but earwax does serve a useful purpose, protecting the ear canal from dirt and bacteria.
However, if earwax builds up and hardens, it can dull your hearing and give you an earache. If you feel your ears are clogged, see your GP or nurse who may suggest olive oil drops to soften and disperse the wax. Don't be tempted to do it yourself with a cotton bud – or any other implement - which only risks damage to the ear. Childhood illnessChildren are susceptible to ear infections, which are among many childhood illnesses that can cause hearing loss.
Usually, infections that fill the middle ear with fluid cause only temporary hearing loss but some may cause harm to the middle or inner ear and lead to permanent hearing loss. Illnesses linked to hearing loss in children include chickenpox, influenza, measles, meningitis, encephalitis and mumps. Born with hearing lossIn the UK, one or two babies in every thousand are born with significant hearing loss. Although congenital hearing loss often runs in families, it can also be triggered by an infection in the mother during pregnancy. Hearing loss can also develop after lack of oxygen or trauma at birth, or if a newborn is premature.
AgeRegardless of how you protect your ears, getting older reduces your hearing as you gradually lose inner ear hair cells.
If you are struggling to hear and it is affecting your quality of life, go to your GP or NHS clinic to arrange a hearing test.



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