Three-channel stabilized power supply. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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The power supply presented below, made using three-output integrated stabilizers, is quite versatile and can be successfully used to power microprocessor devices.
The source diagram is shown in fig. 5.72.
One type 7805 integrated regulator (U1) provides a positive output voltage of 5 V at a nominal current of 1,5 A.
Stabilizers 7812 (U3) and 7813 (U2) provide bipolar output voltages, the values \u12b\u1,5bof which are equal to ±XNUMX V. The maximum output current of these channels is also XNUMX A.
The components of the circuit have the following parameters: electrolytic capacitor C1 - 10 microfarads, 000 V; electrolytic capacitors C35, C2 - 3 uF 7000 V; diodes VD35-VD1 - 6 V 50 A; fuse F3 - 1 A.
The source uses two identical transformers (TV1 and TV2), the secondary windings of which have midpoint taps, the total voltage on each of the secondary windings is 12,6 V, the rated current is 5 A.
The diagram shows that the primary windings of the transformers are connected in parallel, and the secondary windings are connected in series and in accordance to provide the input voltage levels required by the stabilizers U2 and U3.
The connection point of the secondary windings of the transformers is grounded. The lower half-winding of the secondary winding of the transformer TV1 and the upper half-winding of the secondary winding of the transformer TV2, together with the diodes VD1 and VD2 and the capacitive filter C1, form a full-wave rectifier with zero point output.
At the output of this rectifier, a positive voltage relative to ground is formed (about 9 V), which is the input for the integral stabilizer V1.
Complete secondary windings of transformers, diodes VD3-VD6 and capacitors C2, C3 are two full-wave rectifiers with a zero point output, one of which provides negative (on capacitor C2), and the other positive (on capacitor C3) voltage, the values \u17b\u2bof which are approximately equal ±1 V. These voltages are used as input voltages for regulators UXNUMX and UXNUMX. The common conclusions of all three stabilizers are "grounded".
Thus, the power supply has three output channels: one with a positive voltage of +5 V and two with equal but opposite voltages of ±12 V.
Author: Treister R.
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