Home-made converter for powering an energy-saving lamp
Energy-saving lamps are equipped with a large number of electronic components. The latter often remain operational when the spiral burns out, so they can be used for other purposes. In particular, in the form of a switching power supply after some modifications.
Of course, it will not be possible to obtain high power, since there are certain features of inductors that limit the magnetization zone. But a switching power supply obtained from ballast will be enough to power the LED strip.
In the most common lamp ballast scheme, a half-bridge (inventory) is used. The characteristics of capacitors and inductors provide the dosed power required to start the lamp. To get a full-fledged switching power supply, it is necessary to ensure the load is connected to a separate winding. Do this by winding it on the throttle in the line going to the lamp input.
The alteration begins with the dismantling of the ballast housing, taken from an energy-saving lamp. A screwdriver is used, which is constantly rearranged along the contact lines of parts. In this case, strong pressure is excluded, which can become the limit for the flask.
Disconnect the lamp contacts that fit the ballast board - unwind the ends of the conductors from the four pins. After removing the board and the connection with the pins and jumpers.
After soldering the throttle and disassemble it. More often it uses a W-shaped core with two identical and interconnected parts. Remove existing orange tape. They use a pulse soldering iron, which heats the core at the joints of the halves.
After disassembling the core, an insulation layer made of fiberglass fabric is wound on an existing coil and over it an additional ten turns from a conductor of the desired thickness. The latter is selected so that all the turns fit into the available free space.
Collect the core, fix its components using adhesive tape. Test the transformer and add the number of turns, which will provide an output voltage of 12 V.
The ends of the previously arranged winding are cleaned of insulation, puddled with solder. Attach to a rectifier bridge in which high-frequency diodes are installed. The circuit is supplemented by a 1 uF capacitor at 50 V, which will filter the voltage changes.
Connection to the 220-volt network of the resulting block is carried out through a powerful resistor installed in series. It can be an incandescent lamp with a power of 40 ... 100 watts. In the event of a short circuit, it glows.
The circuit must include a switch at the input, all twists are isolated for safety reasons. During the first test, it is better to place the light bulb in a liter jar - it can explode and cause injuries from fragments.