Technical parameters of BMT used in electronic ballasts. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Electrician

Electronic ballasts on discrete elements. Technical parameters of BMT used in electronic ballasts. Fundamentals of circuitry. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Ballasts for fluorescent lamps

Comments on the article

The technology for the production of efficient bipolar power transistors (BMT) was developed several years ago by MOTOROLA and was called H2BIP (High Gain, High Frequency Bipolar Transistors).

Note. The essence of this new technology is that on the same semiconductor structure, in addition to the main high-voltage BMT, an active undersaturation circuit of this transistor and an integrated anti-parallel diode between its collector and emitter are created.

BMTs created using this technology are characterized by the best combinations of static, dynamic and energy indicators among bipolar transistors, while they have an insignificant (no more than ±0,15 μs) spread in the dispersal time t_s. Devices of this series such as BUL45D2, BUL38D, BUL39D, MJE18004D2 and popular MJE13003, MJE13005, MJE13007, MJE13009 are successfully used in electronic ballasts (which are currently promising mass-market products).

BMT type MJE13003, MJE13005, MJE13007, MJE13009 are produced by many manufacturers, so instead of MJE there may be designations ST, RNE, KSE, HA, MJF, etc.

In table. 3.11 shows the technical parameters of the BMT most commonly used in electronic ballasts.

Circuit Features

A comparative analysis of the modes of the output keys of a typical electronic ballast, assembled according to a half-bridge circuit and controlling the operation of two fluorescent lamps with a power of 36-40 W each at a switching frequency of 30-50 kHz, shows that the level of total power losses on the keys when using BMT type BUL45D2, also , like MOTOROLA's MJE13005, is a very small value (about 0,5 W per transistor).

Approximately the same indicators are obtained when using in these units domestic BMT types KT8136A and KT8181A manufactured by OAO ELEKTRONPRIBOR (ZAO FZMT, Fryazino). In the case of use in such ballasts equivalent in current and voltage

Table 3.11. Technical parameters of BMT used in electronic ballasts

Technical parameters of BMT used in electronic ballasts. Circuitry Fundamentals

MOSFET type IRF830 or "ultrafast" IGBT type IRGB410U from IR, the level of power loss on these MTs is 1,5-2 times higher (0,8-1,0 W per transistor).

BMT is also noticeably cheaper than its competing prototypes, which is fundamentally important for obtaining a small final price of electronic ballasts, since they are aimed at replacing inefficient but cheap electromechanical ballasts (chokes with a starter) currently used in lighting engineering in lamps with LL.

Author: Koryakin-Chernyak S.L.

See other articles Section Ballasts for fluorescent lamps.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Alcohol content of warm beer 07.05.2024

Beer, as one of the most common alcoholic drinks, has its own unique taste, which can change depending on the temperature of consumption. A new study by an international team of scientists has found that beer temperature has a significant impact on the perception of alcoholic taste. The study, led by materials scientist Lei Jiang, found that at different temperatures, ethanol and water molecules form different types of clusters, which affects the perception of alcoholic taste. At low temperatures, more pyramid-like clusters form, which reduces the pungency of the "ethanol" taste and makes the drink taste less alcoholic. On the contrary, as the temperature increases, the clusters become more chain-like, resulting in a more pronounced alcoholic taste. This explains why the taste of some alcoholic drinks, such as baijiu, can change depending on temperature. The data obtained opens up new prospects for beverage manufacturers, ... >>

Major risk factor for gambling addiction 07.05.2024

Computer games are becoming an increasingly popular form of entertainment among teenagers, but the associated risk of gaming addiction remains a significant problem. American scientists conducted a study to determine the main factors contributing to this addiction and offer recommendations for its prevention. Over the course of six years, 385 teenagers were followed to find out what factors may predispose them to gambling addiction. The results showed that 90% of study participants were not at risk of addiction, while 10% became gambling addicts. It turned out that the key factor in the onset of gambling addiction is a low level of prosocial behavior. Teenagers with a low level of prosocial behavior do not show interest in the help and support of others, which can lead to a loss of contact with the real world and a deepening dependence on virtual reality offered by computer games. Based on these results, scientists ... >>

Traffic noise delays the growth of chicks 06.05.2024

The sounds that surround us in modern cities are becoming increasingly piercing. However, few people think about how this noise affects the animal world, especially such delicate creatures as chicks that have not yet hatched from their eggs. Recent research is shedding light on this issue, indicating serious consequences for their development and survival. Scientists have found that exposure of zebra diamondback chicks to traffic noise can cause serious disruption to their development. Experiments have shown that noise pollution can significantly delay their hatching, and those chicks that do emerge face a number of health-promoting problems. The researchers also found that the negative effects of noise pollution extend into the adult birds. Reduced chances of reproduction and decreased fertility indicate the long-term effects that traffic noise has on wildlife. The study results highlight the need ... >>

Random news from the Archive

Athletes are harmed by any blows to the head 20.01.2018

Researchers from several American laboratories in experiments on mice have shown that chronic traumatic encephalopathy (CTE) is provoked not only by strong blows to the head, causing a concussion, but also by other traumatic effects. The main risk factor is the frequency of injury: if the head is hit regularly, the likelihood of CTE increases regardless of the strength of the blows. These results explain why helmets and other head protection measures in athletes are often ineffective in preventing chronic traumatic encephalopathy.

The experiments were carried out on mice. Animals were subjected either to a shock wave or to a blow to the head with a blunt object. After that, we recorded what changes occurred in the behavior of mice and whether it is possible to say that specific rodents have a concussion (it is detected by a number of behavioral signs). A similar effect was repeated several times, that is, if at first the mouse was "beaten" with a shock wave, then in subsequent experiments the same method was used. Changes in the state of the nervous tissue of rodents were studied on sections passing through various parts of their brain.

Signs of concussion were observed only in those rodents that were subjected to mechanical blows to the head. At the same time, chronic traumatic encephalopathy developed in those who were exposed to the shock wave, and in those who were beaten on the head in the "usual" way. This means that in some cases CTE does not manifest itself in any way, and its development is not necessarily associated with concussion. Thus, many athletes who have never been diagnosed with a concussion may be affected by chronic traumatic encephalopathy. Those at risk are primarily those who are most often hit on the head - boxers, as well as rugby and American football players.

Chronic traumatic encephalopathy is an organic brain lesion caused by head trauma. With it, attention, memory are disturbed, and mood often also suffers. In CTE, nerve cells often accumulate amyloid proteins that cause Alzheimer's disease. In any case, this pathology causes trouble for the patient: at the level of behavior, it often manifests itself as depression and suicidal thoughts, memory impairment, etc. is observed.

The researchers hope their findings will lead the relevant sports federations to reconsider the eligibility requirements for athletes who have had head injuries to play or practice, and this will help reduce the prevalence of CTE.

Other interesting news:

▪ Space nuclear reactor tested

▪ solar tandem

▪ VCRs are fading away

▪ Thecus N4810 NAS

▪ Hard light for quantum computers

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the Garland website. Article selection

▪ article Promised Land. Popular expression

▪ article What does chicken tobacco have to do with tobacco? Detailed answer

▪ article PC operator. Job description

▪ article Indicators on neon lamps. Encyclopedia of radio electronics and electrical engineering

▪ article AC voltage regulator option. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews