The article describes touch the power control on a specialized chip CAP - the shaper of control pulses of the triac. The proposed the device used the combined control circuit, which, in addition to normal regulation of power consumption, allows to realize the effect continuous smooth increase/decrease of brightness of lamps, for example, in the Christmas tree lights or alarm systems.
Chip CAP made by technology rmap. The voltage - -15 V, and the consumption current is in the range from 0.5 to 2 mA. She applied in industrial the dimmer "ARS - 0,24", "ROS - 0,12", "GREW up to 0.3".
The touch control scheme, implemented on the chip, shown in figure.
When included in the network load, controlled by the regulator, is off. If briefly, about 0.5 with touch sensor E1, then the lamp will flash almost full intensity. If the touch sensor lasts more than for a long time, the brightness of the lamp will first be gradually reduced, and having reached a minimum and the little "waiting", will again begin to increase.
Turn off the power to the load is possible by briefly touching the sensor. When next touch sensor lamp will turn on again, and with the same brightness, that was before the shutdown, because the chip "remembers" the last the value set. If, instead of a sensor to use the button SB1, management processes occur as well for touch. The difference is only that is not required to strictly adhere to the phasing of the connection network. To realize the function of continuous power control button SB1 needs to be latching.
The pin assignment of the chip:
2 - input clock from the network;
3 - primary touch input;
4 - auxiliary input;
5 - negative power supply pin;
6 - output control pulses;
12 - entrance separating the common wire;
14 - the output of the phase locked loop;
15 - General.
Chip regulator is fed from the simplest of secondary power supply with the quenching capacitor comprising limiting resistor R8, capacitor C4, half-wave rectifier diode VD4, VD5 and led HL1, at the same time performs the function of an indicator of network connectivity. If excessive brightness it shall be shorted resistor 100...510 Ohms (not shown). Smooths the rectified voltage of the capacitor C3 and Zener diode stabilizes VD2-level -13 -15...V. directory ("Integrated circuits and their foreign analogues", vol. 2. - Radiosoft, 1999) the supply voltage of the chip CAP is in the range from 13.5 to is 16,5 In, but as practice shows, the minimum supply voltage can be -11 to -12 V. the Resistor R6 limits maximum output current of the chip. The Zener diode VD3 protects the chip with the failure of the triac. The inductor L1 and capacitor C6 reduces the level high-frequency interference. The Zener diode VD1 limits the amplitude of the pulses at the primary input of the circuit.
The device incorporates resistors MLT capacity not less than indicated on the diagram. Led - ALU, ALG, ALW, ALD or with any other allowable direct current less than 20 mA. The transistor is any of a series CT, CT, CT, CT, CT, CT, CT, CT with the current transfer ratio base not less than 100. C-mistor to replace TS-10, TS-16 or similar foreign. When the maximum power load of more than 40 watts to be installed on the heat sink, the size of which depends on load power (at a power of 800 W - not less than 100 cm2).
Zener XA (VD1, VD2) in the worst case it is permissible to substitute or SA two connected in series DA, XI. The Zener diode VD3 - any low-voltage stabilization 20...40 V, for example, XA, SA, XA or two connected in series DD. The capacitor C3 is any oxide capacity of at least 100 µf, C4 and C6 - K73-17, or on foreign the voltage of at least 250 V. the Remaining capacitors - ceramic or any film for a voltage of less than 25 V. the Inductor L1 is made on the segment ferrite core with permeability of 400, length 20...60 mm, diameter 8 mm. Its parameters depend on the anticipated maximum load power. In the author's version at a power of 800 W the inductor is made of two segments of length At 50 mm. each terminal on top of the layer of paper is wound with 40 turns of wire PEV of 0.82. The winding of the inductor, it is desirable to impregnate the BF-2.
The regulator is assembled from a known-good parts, adjustments are not required. In some cases to reduce noise, increase the capacitance of the capacitor C6. If happen false triggering of the triac (lamp is flickering), you need to reduce the resistance of the resistor R10 to 51 Ohms. If they still continue, triac it should be replaced. When you first turn on the load, you should use the incandescent lamps 60...100 watts. The minimum load power depends the specific instance of the triac, and in some cases can be as 3...8 watts. In the author's version of controller with triac COG works with lamp 220V 8W. When you first enable long it is necessary to control the temperature of the triac and throttle. If it would be more than 55...60°C, it is necessary to apply a more powerful heat dissipation of the triac and to wind the winding of the inductor wire of larger diameter. Should not be neglected fuse FU1, because when blown bulb 100 watts in the network there is a current pulse of 20-30 A.
The controller can be supplemented with a simple voltmeter AC voltage, resistor MLT-1, diode KD105B and microammeter (pointer indicator recording level of a tape recorder), for example, M4762.1, M476/1, M4761, M.1. For device M4762.1 the resistance of the limiting resistor is 330 ohms.
When mounting the chip should observe the same precautions as for chips, manufactured in CMOS technology. The device has transformerless AC power. Touch his elements during work is unacceptable.
The proposed regulator easily replaces the standard mechanical switches for internal wiring if the power of the lamps does not exceed 150 watts. Application CAP with chips series C, C with appropriate schematics allows you to implement additional control functions, for example, increase power up to the maximum value, it automatically reduces power, smooth the output at the predetermined fixed value, etc.
Author: A. Butov