Touch power control. Scheme, description

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Touch power control. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Power regulators, thermometers, heat stabilizers

Comments on the article

The article describes a touch power controller on a specialized K145AP2 microcircuit - a triac control pulse shaper. The proposed device uses a combined microcircuit control, which, in addition to the usual regulation of power consumption, allows you to realize the effect of a continuous smooth increase / decrease in the brightness of the lamps, for example, in Christmas tree garlands or alarm systems.

The K145AP2 microcircuit is made using the rMOS technology. Its supply voltage is -15 V, and the current consumption is in the range from 0,5 to 2 mA. It is used in industrial dimmers "ARS - 0,24", "ROS - 0,12", "ROS - 0,3".

The diagram of the touch controller, made on this chip, is shown in the figure.

Touch power control

When connected to the network, the load controlled by the regulator is in the off state. If you briefly, for about 0,5 s, touch the sensor E1, the lamp will flash with almost full heat. If the touch of the sensor lasts for a longer time, the brightness of the lamp will first gradually decrease, and after reaching a minimum and after a little "waiting", it will begin to increase again.

You can turn off the load power by briefly touching the sensor. The next time you touch the sensor, the lamp will turn on again, and with the same brightness that it was before turning it off, since the microcircuit “remembers” the last set value. If you use the SB1 button instead of the sensor, then the control processes proceed in the same way as with touch control. The only difference is that it is not required to strictly observe the phasing of the connection to the network. To implement the function of continuous power control, the SB1 button must be latched.

The purpose of the pins of the microcircuit:

2 - sync pulse input from the network;

3 - main sensory input;

4 - auxiliary input;

5 - negative power output;

6 - output of control pulses;

12 - common wire separation input;

14 - output of the phase locked loop;

15 - common.

The regulator microcircuit is powered from the simplest secondary power source with a quenching capacitor, consisting of a limiting resistor R8, capacitor C4, a half-wave rectifier on diodes VD4, VD5 and an HL1 LED, which simultaneously acts as an indicator of connection to the network. With excessive brightness, it should be shunted with a 100 ... 510 Ohm resistor (not shown in the diagram). The rectified voltage smoothes the capacitor C3 and stabilizes the zener diode VD2 at -13 ... -15 V. According to the reference ("Integrated circuits and their foreign analogues", vol. 2. - RadioSoft, 1999), the supply voltage of the K145AP2 microcircuit is within from -13,5 to -16,5 V, but as practice shows, the minimum supply voltage can be -11 ... -12 V. Resistor R6 limits the maximum output current of the microcircuit. The VD3 zener diode protects the microcircuit in the event of a triac failure. Inductor L1 and capacitor C6 reduce the level of high-frequency interference. Zener diode VD1 limits the amplitude of the pulses at the main input of the microcircuit.

The device uses MLT resistors with a power not less than that indicated in the diagram. LED - AL307V, AL307G, AL102V, AL102D or any other with a permissible forward current of at least 20 mA. Transistor - any of the KT503, KT602, KT603, KT608, KT611, KT630, KT645, KT646 series with a base current transfer coefficient of at least 100. We will replace the Si-mistor with TS112-10, TS112-16 or a similar foreign one. With a maximum load power of more than 40 W, it must be installed on a heat sink, the area of \u800b\u100bwhich depends on the load power (at a power of 2 W - at least XNUMX cmXNUMX).

Zener diodes KS515A (VD1, VD2) in extreme cases can be replaced with 2S213A or two connected in series D814A, KS175Zh. Zener diode VD3 - any low-power one with a stabilization voltage of 20 ... 40 V, for example, KS522A, 2S530A, KS533A or two D814D connected in series. Capacitor C3 - any oxide with a capacity of at least 100 microfarads, C4 and C6 - K73-17 or foreign ones for a voltage of at least 250 V. The rest of the capacitors - any ceramic or film capacitors for a voltage of at least 25 V. Choke L1 is made on a piece of a ferrite rod 400NN long 20...60 mm, diameter 8 mm. Its parameters depend on the expected maximum load power. In the author's version with a power of 800 W, the choke is made on two segments 50 mm long. On each rod, 40 turns of PEV2 0,82 wire are wound over a layer of paper. It is desirable to impregnate the inductor winding with BF-2 glue.

The regulator, assembled from known good parts, does not require adjustment. In some cases, to reduce interference, the capacitance of the capacitor C6 is increased. If false positives of the triac occur (the lamp flickers), you need to reduce the resistance of the resistor R10 to 51 ohms. If they still continue, the triac should be replaced. When first turned on, use an incandescent lamp with a power of 60 ... 100 W as a load. The minimum load power depends on the specific instance of the triac and in some cases can be as low as 3 ... 8 watts. In the author's version, one of the copies of the regulator with a KU208G triac works with a 220 V 8 W lamp. At the first continuous switching on, it is necessary to control the temperature of the triac and the inductor. If it turns out to be more than 55 ... 60 ° C, you need to use a more powerful heat sink for the triac and wind the inductor winding with a larger diameter wire. The fuse FU1 should not be neglected, since when a 100 W lamp burns out, a current pulse of 20 ... 30 A occurs in the network.

The regulator can be supplemented with a simple AC voltmeter, consisting of an MLT-1 resistor, a KD105B diode and a microammeter (pointer indicator of the recording level of a tape recorder), for example, M4762.1, M476 / 1, M4761, M6850.1. For the M4762.1 device, the resistance of the limiting resistor is 330 kOhm.

When mounting the chip, the same precautions should be followed as for chips made using CMOS technology. The device has a transformerless mains supply. Touching its elements during operation is unacceptable.

The proposed regulator easily replaces standard mechanical switches for internal wiring, if the lamp power does not exceed 150 watts. The use of K145AP2 with microcircuits of the K561, K564 series, with appropriate circuit solutions, allows you to implement additional control functions, for example, increasing power to the maximum value, automatically reducing power, smoothly reaching a pre-fixed value, etc.

Author: A.Butov

See other articles Section Power regulators, thermometers, heat stabilizers.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

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 ... >>

Random news from the Archive

First oil paintings 12.11.2008

Buddhist artists in Bamiyan (Afghanistan) were painting with oil paints several centuries before this technique was invented in Europe in the XNUMXth century.

X-ray analysis of the smallest flakes of paint from the frescoes depicting Buddha and mythical animals located in the caves showed that in 12 out of 50 frescoes the pigments were mixed with vegetable oil - either poppy or walnut oil. In addition, the images are covered with a protective layer of transparent vegetable resin. The frescoes date back to 650 AD.

Other interesting news:

▪ Zeolite in aluminum

▪ Microsoft contact lenses measure blood sugar

▪ Microrobots of Swiss watchmakers

▪ Video camera SONY DCR-HC85

▪ A man's character does not depend on his brothers and sisters

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the Radio Control website. Article selection

▪ The Volga flows into the Caspian Sea. Popular expression

▪ article Why fainting goats got such a name? Detailed answer

▪ Mount Kilimanjaro article. Nature miracle

▪ article Simulator of train sounds. Encyclopedia of radio electronics and electrical engineering

▪ article Shawls in the air. Focus Secret

Leave your comment on this article:

All languages of this page

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