Work with the KR1182PM1 chip. Reference data

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Work with the KR1182PM1 chip. Reference data

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Encyclopedia of radio electronics and electrical engineering / Reference materials

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Microcircuits KR1182PM1 (analogue K1182PM1R), which are phase power regulators in a 220 V network, allow you to create simple and stably operating devices. They are well-deservedly popular with radio amateurs. Chips allow you to control loads up to 150 watts. provide smooth switching on and off of the load power supply. I have been designing devices based on these microcircuits for about 10 years. During this time, some experience of their application has been accumulated.

Working with the KR1182PM1 chip

Typical switching circuits and brief information about KR1182PM1 can be found in [1,2], and options for various devices: circuits and designs in which these microcircuits are used can be found in [4-10]. Long-term use of these microcircuits leads to a disappointing conclusion: their reliability, to put it mildly, is low.

In my developments, when working in an unstable network, all devices in which these microcircuits controlled the load directly (without an attached triac) repeatedly failed. Moreover, the operating time of each microcircuit before its failure was quite stable: 1000 ... 2000 hours. All damaged microcircuits failed with a rupture of the case, although they were installed on small copper or brass heat sinks and worked with a load (incandescent lamps) with a power of no more than 60 watts. At the same time, no failure of these microcircuits was recorded if they worked in conjunction with a mounted triac (thyristors) and were switched on according to the diagram shown in the figure.

The peculiarity of such an inclusion is that that most of the current load falls on the external triac VS1. than, probably, the degradation rate of the microchip crystal decreases. In addition, the varistor R4 protects the microcircuit and the triac from damage by mains voltage surges. When the mains voltage amplitude exceeds 400 ... 450 V, the varistor resistance decreases sharply, as a result of which the current through the varistor, current-limiting resistor R5 and the triac control electrode increases. VS1 opens, and part of the mains voltage is supplied to the load, usually insufficient to burn out incandescent lamps or electric heater coils.

In my opinion, in the recommended switching circuits, the capacitance of capacitors C2 and C3 is overestimated. By reducing the capacitance of these capacitors to 0,47 ... 0,33 μF, you can increase the maximum power delivered to the load, as well as reduce the level of interference. For the same purpose, I do not recommend reducing the resistance R1 to less than 150 kOhm. It is best to take this resistor with a switch that can be used to disconnect the device from the network. If the load current significantly exceeds the allowable current of the switch contacts (usually 1 ... 2 A), then the switch can be connected to an open circuit near the resistor R2. This chip has no imported analogue.

In various phase power regulators, switches, relays and other automation devices, it is recommended to use triacs with an operating voltage of at least 600 V, and capacitors C4. C5 - with a voltage of at least 630 V (for film, for example, K73-17) or 1000 V (for ceramic, for example, K15-5). In my opinion, if high reliability of devices is required, especially those operating around the clock, it is advisable to refrain from using these microcircuits.

It is possible that some of the readers will have their own opinion regarding the reliability of these microcircuits, I will be interested to know about it.

Literature

I. Koltsov. Microcircuit of the phase regulator KR1182PM1. - Circuitry, 2001, No. 10. P.51.
A. Nemich. Chip KR1182PM1 - phase power controller. - Radio, 1999. No. 7. P.44.
About replacing the triac ... - Radio, 2000, No. 9. P.46.
A. Butov. Acoustic relay. - Circuitry, 2002, No. 3, P.2.
A. Butov. Temperature controller on the chip KR1182PM1. - Circuit design. 2002. No. 10. From 33.
A. Butov. Touch switch on KR1182PM1. - Radio constructor, 2003, No. 2, p.26.
A. Butov. Time relay on KR1182PM1. - Radioworld. 2003, No. 3. S. 17.
A. Butov. Heavy duty time relay on KR1182PM1. - Radioamator. 2004. No. 3. P.20.
A. Butov. Phone call indicator light. - Radiomir, 2004, No. 7. C.10.
A. Butov. Power regulator - photorelay. - Radioworld. 2005, No. 2. P.17.

Author: A. Butov, village of Kurba, Yaroslavl region

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