Electronic control of the phase regulator KR1182PM1. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Lighting

 Comments on the article

The main purpose of the KR1182PM1 chip [1] is to smoothly turn on and change the brightness of incandescent lamps, control other AC loads up to 150 W, and more with additional external thyristors.

The adjustment is usually carried out manually using a variable resistor connected between pins 3 and 6 of the microcircuit and shunted by a capacitor that creates the desired turn-on delay. But it is also possible to change the power supplied to the load electronically by applying a control voltage between the above terminals (plus - to terminal 6), as is done, for example, in [2].

The main disadvantage of this method is the unsatisfactory control characteristic. Figure 1 shows the experimentally taken dependence of the effective value of the voltage on the load UH on the control voltage Uy (curve 1). Except for a narrow central part, it is non-linear, and when the control voltage is less than 0,47 V, the load remains off.

It is possible to improve the linearity of the electronic regulator by connecting, as shown in fig. 2, between terminals 3 and 6 of the microcircuit field effect transistor VT1. With an increase in the voltage between the source and the gate, the resistance of the transistor channel increases, which leads to an increase in the voltage at the load of the KR1182PM1 microcircuit. Resistor R1 limits the minimum resistance of the control circuit, which reduces the "dead zone" and compensates for the spread of the initial current of the transistor.

The upper section of the control characteristic is largely linearized (curve 2 in Fig. 1). This is due to the fact that its bending is compensated by the nonlinearity of the transient response of the field-effect transistor, which is in a mode close to cutoff. However, in the lower section of the control characteristic, the non-linearity of the transistor plays a negative role, which is clearly seen from a comparison of curves 1 and 2.

Further improvement in the linearity of regulation can be achieved by assembling the control unit on two transistors according to the circuit shown in Fig. 3. The voltage at the load in the range from 30 V to the maximum depends almost linearly on the control voltage (curve 2 in Fig. 1).

Establishing a regulator assembled according to any of the above schemes comes down to setting the initial current in the circuit of terminals 3 and 6 of the KR1182PM1 microcircuit. Replacing the fixed resistor R1 with a tuned one, set its slider to the position of minimum resistance and, at zero control voltage, gradually increase the resistance until the output voltage begins to rise. After that, the resistor is replaced by a constant, resistance slightly less than that found.

The choice of the transistor KP303 And as a regulator is not accidental. Compared to other field-effect transistors, its transient response has the greatest deflection in the desired zone. You can use KP303 transistors with letter indices B, C, G, choosing instances with a cut-off voltage of approximately 1 V.

Literature

1. Nemich A. Chip KR1182PM1 - phase power controller. - Radio, 1999, No. 7, p. 44-46
2. Biryukov S. Film projection frequency stabilizer for re-recording on video. - Radio, 2000, No. 10, p. 35,36.

Author: A.Pakhomov, Zernograd, Rostov region

See other articles Section Lighting.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

The threat of space debris to the Earth's magnetic field 01.05.2024

More and more often we hear about an increase in the amount of space debris surrounding our planet. However, it is not only active satellites and spacecraft that contribute to this problem, but also debris from old missions. The growing number of satellites launched by companies like SpaceX creates not only opportunities for the development of the Internet, but also serious threats to space security. Experts are now turning their attention to the potential implications for the Earth's magnetic field. Dr. Jonathan McDowell of the Harvard-Smithsonian Center for Astrophysics emphasizes that companies are rapidly deploying satellite constellations, and the number of satellites could grow to 100 in the next decade. The rapid development of these cosmic armadas of satellites can lead to contamination of the Earth's plasma environment with dangerous debris and a threat to the stability of the magnetosphere. Metal debris from used rockets can disrupt the ionosphere and magnetosphere. Both of these systems play a key role in protecting the atmosphere and maintaining ... >>

Solidification of bulk substances 30.04.2024

There are quite a few mysteries in the world of science, and one of them is the strange behavior of bulk materials. They may behave like a solid but suddenly turn into a flowing liquid. This phenomenon has attracted the attention of many researchers, and we may finally be getting closer to solving this mystery. Imagine sand in an hourglass. It usually flows freely, but in some cases its particles begin to get stuck, turning from a liquid to a solid. This transition has important implications for many areas, from drug production to construction. Researchers from the USA have attempted to describe this phenomenon and come closer to understanding it. In the study, the scientists conducted simulations in the laboratory using data from bags of polystyrene beads. They found that the vibrations within these sets had specific frequencies, meaning that only certain types of vibrations could travel through the material. Received ... >>

Random news from the Archive Holographic buttons for contactless control of equipment 25.02.2021 Specialists of the Japanese company Murakami have developed holographic buttons for non-contact control of equipment. They are supposed to be used in public toilets so that a person comes into less contact with surfaces. The development works on the principle of touch displays, however, in this case, the image is not displayed on the surface, but is projected in the air. To press the button, you only need to touch it in the air, that is, there is no need to contact the surface. It is known that the hologram itself is projected by means of a special light source and a large number of mirrors. Recognition, in turn, is carried out thanks to infrared sensors. It is assumed that holographic buttons can be implemented even in ordinary doors to avoid touching the handles.

Other interesting news:

▪ Microbes in a squirrel wheel

▪ World's largest bacterium discovered

▪ Texas Instruments reveals details of its 45nm process technology

▪ A chair with a cardiograph will prevent the driver from falling asleep at the wheel

▪ Analog Devices ADuM5x2x and ADuM6x2x Power Converters

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Power supplies. Article selection

▪ article Multipurpose shovel. Drawing, description

▪ article What causes red-eye in photos? Detailed answer

▪ article Building a fire in the parking lot. Tourist tips

▪ article Amplifier for FM receiver. Encyclopedia of radio electronics and electrical engineering

▪ article Digital tone block. 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