Reducing the voltage on an inductive load using capacitors. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Regulators of current, voltage, power
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The material [1] describes in detail the connection of a 42 V soldering iron to a 220 V network through a capacitor. times more than when connected through a step-down transformer.
At one time, with the invention of semiconductor rectifier diodes, designers encountered such an unpleasant phenomenon: the diodes in the power units of radio equipment became unusable very quickly, although nothing like this happened with lamps. Of course, tube diodes are more enduring than semiconductor ones, but not to the same extent! It turned out that at the moment of current supply in the circuit (Fig. 1), a short circuit (SC) occurs through an uncharged capacitor.
The duration of such a short circuit directly depends on the amount of energy required to charge the capacitor. In order to somehow stretch the charge of the capacitor in time, special resistors (Fig. 2) began to be included in the power supply of TVs to reduce the inrush current. Such resistors are in all TVs, and in other solid devices.
Therefore, it is very imprudent to protect incandescent lamps at the moment of switching on with the help of capacitors [2], because at the moment of switching on, the maximum current will flow through the lamp! The capacitor does cause a decrease in the supply voltage, but not at the moment of switching on.
Those who tried to exclude current-limiting resistors from the power supply circuit have already seen that such an "innovation" greatly reduces the life of semiconductor devices. It is necessary to pay attention to other cases of using capacitors in series connection with other devices.
References:
- On the inclusion of soldering irons in the network 220 V//Electric. - 2002. No. 3. - C.26.
- Kolomoitsev K.V. Economical chandelier//Electrician. - 2000. No. 10. - C.24.
Author: Y. Bearded
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