Bicycle voltage stabilizer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Electronics in everyday life
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The proposed device is designed to power the headlight lamp with constant voltage, in it all transistors are silicon, the collector terminals of the transistor VT1 and the base VT3 are connected to the "common" wire through the resistor R3, and not through the zener diode, a VD2 diode is inserted into the emitter circuit of the transistor, and between the terminals The emitter and collector of the transistor VT1 is equipped with a resistor R1, which facilitates the "start" of this stabilizer. The input voltage to the stabilizer is supplied from a rectifier made on the diode bridge VD1 and smoothing capacitors C1, C2.
The alternating voltage on the bridge comes from the bike generator. During the operation of the bicycle generator, the output voltage of the diode bridge can change over a wide range, but at the output of the stabilizer (i.e., at the terminals of the EL.1 lamp of the bicycle headlight), it does not exceed the maximum allowable voltage of the lamp (3,5 V or 6 V, depending on the lamp used and the resistance of the resistor R3). In addition to those indicated in the diagram, you can use transistors KT313A-KT313V, KT315A-KT315I, any of the KT503 (VT1) series; Kt815A-KT815G, KT817A-KT817G, KT805AM, KT805BM (VT3); KT361A-KT361D, any of the KT502 (VT3) series. Diode bridge VD1 - any of the KTs405 series, diode VD2 - any with a permissible rectified current of at least 0,3 A.
Establishing a stabilizer comes down to selecting a resistor R3 with such a resistance that the voltage on the lamp does not exceed the allowable (3,5 V or 6 V, depending on the lamp used) even at the maximum voltage of the velogenerator. It should be noted that this circuit has the following disadvantages: the voltage drop across the bridge diodes VD1, the diode VD2, the emitter junction VT2 is large, as a result of which, in order to obtain an output voltage of the stabilizer of 3,5 V, about 7 V must be supplied to the diode bridge from the cycle generator. And that requires faster driving.
Publication: cxem.net
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