Bipolar power supply, 220 / 0,7-5,5 volts 2,5 amperes. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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The bipolar power supply is designed to ensure the operation of a variety of devices assembled on transistors.
The main parameters:
- Output voltage of each arm, V ....... 0,7 .. 5,5
- Maximum load current, A ....... 2,5
- Stabilization factor......1200
- Output resistance, Ohm at a load current of 0,5 A.......0,01
- at a load current of 2,5 A ....... 0,015
- Double amplitude of the output voltage ripple (at a load current of 2,5 A), V ....... 2
The power supply unit consists of one common rectifier (V7-U10) and two mutually dependent compensation stabilizers made in series (V11, V12, A1 and V13, V14, A2).
One stabilizer is controlled by a signal from the comparison node (V3) of the output and reference voltages. To control another stabilizer, the sum of the output voltages of the stabilizers is used.
The source of exemplary voltage for the upper (according to the scheme) stabilizer is a parametric stabilizer on a zener diode V4 with a series-connected current-stabilizing element (field-effect transistor V3). The source of exemplary voltage for the lower arm is the output voltage of the upper arm on the resistor divider R12, R13, R14 and is supplied as a difference in absolute values to the inverting input of OU A2. The amplified difference signal is fed to the control element (V13, V14) and changes its resistance.
The indicated parameters of the power supply can be obtained by using an op-amp with a gain of 10 (with an open feedback circuit) and transistors with a static current transfer coefficient h000e> 21.
Transformer T1 is wound on a magnetic circuit W 28 x 42. Winding I contains 900 turns of PEV-1 wire - 0,15, windings II b and II c - 50 turns of PEV-1 - 1,0 each.
The inductor L1 is made on the magnetic circuit Ш16 x 40 without a gap. 150 turns are wound on the frame in two wires PEV-1 - 1,0 without insulating gaskets and the resulting windings are turned on according to the diagram.
See other articles Section Power Supplies.
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