Bipolar power supply from a unipolar source. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
Comments on the article
This circuit is very easy to assemble and practically does not require special adjustment.
(click to enlarge)
Features:
- operating voltage range - 6-30V;
- load current - 1A;
- voltage deviations at an input voltage of 30V and a load of 1A - +/- 1%.
The whole circuit is based on the principle of operation of a comparator assembled on a KR140UD608 microcircuit. A reference voltage equal to half the supply voltage is applied to the non-inverting input of the microcircuit (pin3). The reference voltage is set by voltage dividers (R1, R2).
The inverting input of the microcircuit (pin 2) is supplied with a feedback voltage taken from the output of the emitter follower, consisting of transistors (VT1-VT4). From the output of the microcircuit (pin 6), the signal is fed to the input of the emitter follower. Pins 7 and 4 of the DA1 chip are connected respectively to the input supply voltage (pin 7 - "+", pin 4 - "-").
The beauty of this circuit is that it is able to operate from 6V with a maximum allowable 30V and balance the voltage arms regardless of input voltage surges.
See other articles Section Power Supplies.
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