Charger Tourist. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Alternative energy sources
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On a long hike (walking or cycling) you can not do without lighting. Flashlights that are recharged from the mains are not enough for a long time, and tourist routes pass mainly in places where there are no power lines. The charger "Tourist" will help to solve this problem. To do this, you need to pull out small-sized batteries of the D-0.25 type from two flashlights and insert them into the charger.
Charger "Tourist" (Fig. 1) consists of a bicycle generator 5, which is mounted on a pole 4 and the charger itself 6. The generator is operated by four caps attached to jumpers 1, which are connected to nozzle 2 and rotate under the action of the wind [1] . The cap can be made from a metal circle with a diameter of 94 mm, cut from galvanized iron with a thickness of 0,5 mm. We remove part of the circle, and bend the rest with a cone and solder the ends of the workpiece along the generatrix. We solder or weld jumpers 100-110 mm long, curved at the ends, to each cap. As jumpers, you can take a copper or metal wire with a diameter of 4,4-6,0 mm, the ends of which are inserted into four drilled holes of the nozzle at an angle of 90 ° relative to each other, and the attachment points can be soldered or welded by electric welding.
The inner diameter of the nozzle should be 2-3 mm larger than the outer diameter of roller 7 of the bike generator. Having cut and turned a gasket 8 from a polyethylene water pipe of the appropriate diameter with a length equal to the internal size of the cap, insert it inside the nozzle and put it on the bike generator roller. When using the bike generator on the charger all the time, the jumpers can be welded directly to the bike generator roller. It is better to grind the nozzle on a lathe or, in extreme cases, make it from a metal water pipe of the appropriate diameter by welding a washer on top.
The bike generator is attached to the top of the pole with its own clamp. The charger is also attached here and connected to the bike generator. The length of the composite pole is 3 m (2x1,5 m), it is mounted in an open area with four stretch marks, and in the presence of trees - on the top of the tree.
The alternating current of the cycle generator (Fig. 2) is supplied to the rectifier bridge VD1 ... VD4 and then to charge four D-0.25 elements [2]. To smooth out ripples, an electrolytic capacitor C1 with a capacity of 100 microfarads x 16V is installed. Rectifier diodes - any type for a permissible current of at least 100 mA, for example KD509, KD510, KD522.
The duration of charging the batteries depends on the voltage of the bicycle generator, which in turn is determined by the strength of the wind. In light wind it is recommended to charge only two batteries D-0.25. After charging, they are inserted into flashlights, which are used at night for their intended purpose.
Cyclists can fit the charger (by removing the capped attachment from the alternator roller) on their bikes during daylight hours. Since the current of the bicycle generator installed on the bicycle is 0,3 A, it is necessary to install a 300 Ohm resistor in series with the batteries in the charger circuit, which will make it possible to limit the charging current to 20 mA.
References:
- Trowel.-1991.-No. 46.-S.4-5.
- Tereshchuk R.M. etc. Handbook of a radio amateur. -K.: Nauk.dumka.-1982
Author: V.M.Bosenko
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