impulse stabilizer. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Surge Protectors

 Comments on the article

Switching stabilizer - a switching circuit that operates in a closed loop and regulates the output parameters of the IP. Let's look at one of her examples.

The topic of developing powerful switching power supplies is still relevant. On fig. 1.35 shows a diagram of a half-bridge voltage converter implemented on a modern element base with one primary winding.

The input rectifier circuits are determined by the output power of the converter.

With an output power of up to 100 W, the DB107 can be used as a diode bridge. With increasing power, bridges of the BR310 type and more powerful can be used. The rectifier in the secondary winding of the pulse transformer can be made according to any scheme, depending on the parameters and nature of the load.

Rice. 1.35. Electrical diagram of a half-bridge voltage converter

The tuned resistor R4 is designed to change the frequency of the oscillator over a wide range.

One IR2153 chip is used as an oscillator (you can use any of the microcircuits: IR2151D, IR2152D, IR2155D, IR21531D). A distinctive feature of the microcircuits under consideration with the "D" index from microcircuits without an index is that in the first case, a high-voltage diode is already built into the oscillator to power the control circuit of the output transistor switch.

The appearance of a typical SMPS is shown in fig. 1.36.

Rice. 1.36 Appearance of a typical SMPS

The IR2153 oscillator has an external frequency control (R4), a fixed pause of 1,2 µs, a miniature DIP-8 package.

A 15,6 V zener diode is built into the oscillator, which stabilizes the supply voltage received through the current-limiting resistor R2 from the main power circuit.

Powerful MOSFET transistors with a built-in protection diode, such as IRFBC40, must be used as output switches.

When powered from a 220 V mains, the permissible drain-source voltage of the MOSFET transistor must be at least 400 V. The value of its current is determined by the required power of the converter.

In fact, the output power is determined only by the output transistors used (the choice of MOSFET transistors is huge, the current range is from units to hundreds of amperes), the driver - IR2103 "can barely cope" with IRFZ46 transistors, and it may simply not pump more powerful transistors.

The ideal replacement is the IR2183 chip - a complete analogue in terms of characteristics, pinout and package type, but with an output current of up to 1,7 A. It should simply be soldered in place of the IR2103, without any changes on the board. In this case, it is desirable to increase the capacitance of capacitor C5 several times (at least 1 μF), it must be film.

Current-limiting resistors R5 and R6 in the gate circuits are designed to limit the output control current when overcharging the input capacitance of MOSFET transistors.

With an output power of 50 W or more, it is necessary to install powerful MOSFET transistors on radiators.

The operating frequency of the oscillator is set by one RC circuit.

It is recommended to use a resistor with a resistance of at least 5 kΩ. The generation frequency is determined by the formula:

F \u1d 1,38 / 1 x (R75 + 1) xCXNUMX.

where R1 is in ohms, C1 is in farads.

When assembling the board, it is necessary to provide electrostatic protection for MOSFET transistors. They should be soldered to the board last.

The choice of operating frequency and the calculation of the output transformer have been described more than once in the literature for radio amateurs.

For adjustment in a wide range of pause times between pulses, IR2156 or IR21571 self-oscillator microcircuits are suitable.

Authors: Kashkarov A. P., Koldunov A. S.

See other articles Section Surge Protectors.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive Wobbling bicycle 13.10.2005 In Taiwan's ninth international bicycle design competition, the first prize was won by a new American children's bicycle that converts from three-wheeled to two-wheeled on the go. For a learner to ride a bicycle, the moment of starting is the most difficult, but on this model the trip begins with three wheels. As the rider accelerates and shifts body weight forward, the divergent rear wheels first become parallel and then converge, becoming almost a single wheel. There is no need to support the child on the run or to attach additional rear wheels during training. Now the possibility of serial production of such a bicycle is being considered.

Other interesting news:

▪ External keyboard for mobile devices

▪ iron therapy

▪ Transparent film turns glass into a projection screen

▪ New system for nanotheranostics

▪ By evening the brain shrinks

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Videotechnique. Article selection

▪ article Side baking. Popular expression

▪ article How durable are atoms? Detailed answer

▪ article Onagric. Legends, cultivation, methods of application

▪ article Mobile communication. Directory

▪ article Converter 65,8...75 MHz - 88...108 MHz. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages ​​of this page

Arabic	Hebrew	Polish
Bengali	Hindi	Portuguese
Chinese	Italian	Spanish
English	Japanese	Turkish
French	Korean	Ukrainian
German	Malay	Vietnamese

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

www.diagram.com.ua
2000-2024