A simple power control of the load can be made from industrial the phase speed controller electric BUE-SVR. This device has small size 50x55 mm, excluding handle of the reversing switch. It the purpose is to regulate the rotational speed of the commutator motor AC.
As for control units electric drill (BUE) at all, they are made by one principle and contain inside the multi-turn variable resistor and triac. As elements of "design" in the scheme are twofold nonpolar capacitor (type K73-53-3 or equivalent) with a branch from the mid-point - it necessary for smoothing the voltage surge through the field winding of the drill. In sale are similar (in appearance and labelling) industrial devices coated with case marking BUE, UAH (regulator voltage), etc.
The maximum voltage is supplied to the load when the variable resistor (connected in the circuit of the PTC) minimum resistance. In some types BUE (as in BUE-SVR) sets up a reverse switch to reverse rotation motor. In the marking device indicated by the letter "R". Designation the numbers after the abbreviations BUE corresponds to the maximum current in the load on which is capable of this regulator. For example, RS-1-220 is designed for a current of 1 A and voltage 220 V.
In other related devices, such as BUE-1, mode no reverse, but the scheme include all BUE identical. The control voltage supplied to the load, occurs by changing the delay of the opening of the triac relative to the moment the transition voltage (sine wave) through "0".
The current consumed BUE-SVR no load "idle" only 10 mA. IN BUE there is a button mechanically fixing the position of the inclusion (in this case important) - for use as power control in load. Before the use of a mechanical "trigger" inclusion should drown to the limit and be locked in this position by the lock button. Located in the end of "trigger" control knob of the variable resistor to regulate the output voltage. These options BUE allowed to experiment with the use of the unit as the voltage regulator on the load, in the form of a bulb. Connection diagram BUE presented in Fig.
Electrical circuit of the control unit drill (BUE)
Lamp power EL1 should not exceed 400 watts. Connected in parallel to the lamp voltmeter showed a voltage of 35 V At one end position of the regulator, 225 - the other. The experiment was conducted in the evening under artificial the lighting frequency of the voltage in the lighting network is 50 Hz and the voltage V. 228 In addition to filament lamps for a voltage of 220 V, you can apply the soldering iron (limiting, thus, his power) and other suitable devices.
For power control of a load no other elements were not required. The cost of BOUÉE in shops electrical goods is not higher than 70 rubles. The connection of input and output circuits is drawn according to the housing of BOUÉE the Pinout and the terminals. Contact BUE under the symbol "1" is used to connect the capacitors and the excitation winding of the electric motor, ignored.
Described BUE designed to work with both active and inductive load power loads up to 400 W (temporary load). That is the use of BOUÉE in 24 hours with a load capacity of 400 watts will bring it down due to violations of the heat mode. For long-term use is necessary carefully disassemble the housing of BOUÉE and install the thyristor to the cooling radiator area of not less than 200 cm2. Adjustment range current voltage load relative to the input voltage of 220 V is in the range of 15 to 98 %. Operating temperature range -40...+70° C.
Author: A. Kashkarov, St. Petersburg