Optocoupler voltage stabilizer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Surge Protectors
Comments on the article
The proposed network voltage stabilizer circuit differs from those previously described in that the voltage feedback is organized using an optocoupler. Due to the inertia of the light bulb included in the OEP2 optocoupler, a certain hysteresis is achieved, which is mandatory in feedback circuits. Without hysteresis, the circuit will relax, which will be expressed in the flickering of the HL1 bulb, which is the load in this circuit.
Consider the operation of the circuit shown in Fig.1.
(click to enlarge)
At the moment the mains voltage is turned on, a sinusoidal voltage limited by resistor R4 is supplied to the diode bridge VD1. There is no voltage at the load, so the resistance of the optocoupler is high, the transistor VT1 opens due to the bias coming from the resistor R6. The current flowing through the resistor R5 and the open transistor VT1 charges the capacitance C1. At the moment when the voltage reaches the breakdown level of the analog of the dinistor, assembled on the parts VT2, VT3, R7, R8, the capacitor C1 will be discharged to the primary winding of the pulse transformer T1. As a result, a pulse from the secondary winding will open the triac VS1. The capacitance charging speed time, and hence the triac opening time, depend on the resistance R5 and the resistance of the emitter-collector junction of the transistor VT1.
By closing this transistor, we reduce the voltage at the load by reducing the resistance of the optocoupler resistor. The threshold at which the balance will come is regulated by the resistor R2, which is the output voltage regulator.
The adjustment consists in setting the maximum voltage using resistor R5 with the wire disconnected from potentiometer R2 and optocoupler U1.
Details. Transformer T1 is wound on a M2000NM ferrite ring with dimensions K20Ch12Ch6. The primary winding consists of 100 turns, and the secondary of 60 turns of PEV1 wire with a diameter of 0,15 mm.
The device is assembled on a single-sided printed circuit board measuring 70x70mm. shown in Fig.2.
Author: S.M. Abramov
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 Smart Musical Sleep Mask Xiaomi Easy Air Brain Wave Sleeping Eye Mask
26.10.2018
Xiaomi has launched a new accessory called the Easy Air Brain Wave Sleeping Eye Mask, which is a smart sleep mask.
Easy Air Brain Wave Sleeping Eye Mask is equipped with three electrodes that allow you to capture brain activity. After that, relying on the artificial intelligence system, the mask plays music that is more optimal for the situation. All this allows you to relax the brain as quickly as possible, after which the person falls asleep.
By analyzing the waves emitted by the brain, the mask gradually reduces the volume of the music so as not to wake you up after you have fallen asleep. In the morning, according to the set schedule, the mask will turn on a quiet melody, which, gradually increasing, will allow you to wake up without stress.
The mass of the accessory is only 50 g, the fabric itself can be detached from the electronic base and washed.
|
Other interesting news:
▪ Environmentally friendly batteries
▪ Where the brain tickles
▪ Disposable video camera
▪ Crossover Genesis GV60 recognizes its owner by face
▪ Tropics move to the Arctic
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ site section And then an inventor (TRIZ) appeared. Article selection
▪ article Writing. History of invention and production
▪ article Who is Socrates? Detailed answer
▪ article Krupoveyshchik. Standard instruction on labor protection
▪ article Solar Ponds. Encyclopedia of radio electronics and electrical engineering
▪ article Import heads in domestic tape recorders. 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
www.diagram.com.ua
2000-2024
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese