Regulator to a bipolar power supply. Scheme, description

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Regulator to a bipolar power supply. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Power Supplies

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You can add a simple prefix to a stabilized 12 V power supply (Fig. VIII. 19) and get an adjustable power supply for two bipolar voltages (6V).

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The maximum current of the stabilized voltage source must be at least 2 A. Resistor R2 is used to change the ratio of the absolute values of the output voltages in the range from 0,6 to 1,6. If the output voltages are equal (their ratio is equal to 1), the maximum load current of each arm can reach 2 A. For different values of the output voltages, the output current should be reduced. So, at extreme values, the maximum load current of each arm should not exceed 1 A. Operational amplifier A1 compares the voltage at the output of the resistor voltage divider R1R2R3 with the voltage at the output of the Common power amplifier (transistors V5, V6). The difference between these voltages is minimized by a corresponding change in the bias at the base of transistor V3. The V1V2R4 chain is used to initially set this offset.

Operational amplifier A1 must have an open-loop voltage transfer ratio of 4500, transistors V3, V5, V6 are selected with a static current transfer ratio of more than 40, and V4 - 100-150.

If it is necessary to increase the voltage of the attachment arms from 6 to 12 V, the supply voltage should also be increased to 24 V, and the operational amplifier A1 should be replaced with K1UT401B. In this case, it is necessary to increase the resistance of resistors R4 and R5 approximately twice

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