Prefix stabilizing to VU-1. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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I, like many radio amateur designers, have recently increasingly had to deal with electronic devices that are powered by the vehicle's on-board network. These are powerful car radios and radio stations, as well as special electronic systems. Such devices consume a current of about 3 A, so when they are used in stationary conditions, there is a problem with the power supply.
The VU - 1 rectifier of the Ulyanovsk Instrument-Making Plant, intended for charging car batteries, helped me solve it. The fact is that "VU - 1" is essentially half of the device I need. It has sufficient power (up to 100 watts). It remains only to supplement it with a stabilizing prefix for a voltage of 12V at a current of up to 6 A.
The prefix (see diagram) is made according to the classical voltage stabilizer scheme from non-deficient parts of low cost. The operation of the composite transistor VT1 is controlled by a DC amplifier on the transistor VT2: its emitter is connected to a reference voltage source consisting of a zener diode VD1 and a resistor R2, and the base is connected to the measuring circuit R3R4. Resistor R1 is used to supply bias to the base of the transistor VT1. Resistor R4 sets the required output voltage.
Capacitors C4 and C5 prevent excitation of the stabilizer at high frequency, and C1 - C3 form a filter that smoothes the output voltage ripple "VU - 1".
Attachment parts are mounted on a printed circuit board made of any foil material. Printed conductors of high-current circuits must be at least 10 mm wide and well tinned. The cross-sectional area of the mounting wires is not less than 2 mm2.
All fixed resistors - MLT, trimmer R4 - of any type. Capacitors C1 - C3 and C5 - K50-35 or K50-24 (I used foreign-made oxide capacitors from UPTRON and HONSING), capacitor C4 - any non-polar. A powerful transistor VT1 is installed on a heat sink designed for a power dissipation of at least 60 watts.
The printed circuit board of the device can be mounted directly on the heat sink of the transistor VT1 isolated from the case.
Establishing the set-top box comes down to setting the output voltage of 4 V with a trimmer resistor R12.
To work with the stabilizing prefix in the nominal mode, the toggle switch S1 "VU - 1" must be in the "More" position.
It is better to connect capacitor C4 between the base of the transistor VT1 and the common wire.
Author: A.Sokolov, Dimitrovgrad, Ulyanovsk region.
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