Bipolar power supply with a conventional transformer winding, 220/15 volts 3 amps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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The proposed scheme contains a small number of details, but despite this, it provides fairly high performance. And simplicity and non-criticality to the parts used makes it possible to repeat it even for inexperienced radio amateurs.
The schematic diagram of the power supply is shown in fig. 8.6. It is based on the integrated stabilizer KR142EN5A, which made it possible to achieve high parameters of the entire device.
The operational amplifier compares the voltages of the shoulders in absolute value (the voltage at the connection point of resistors R4 and R5 is compared with the voltage on the common wire, i.e. with zero) and, acting as a comparator, amplifies the error signal (the difference between the voltage at the connection point R4 and R5 and a common wire) and feeds it to the base of the transistor VT1. Thus, the symmetry of the stabilizer arms is maintained with great precision.
The rectifier is made on diodes VD1 and VD2 according to the voltage doubling scheme, which makes it possible to use a transformer with one secondary winding. The device can use a transformer with a secondary winding for a voltage of 13 ... 15 V at a load current of up to 3 A. Diodes VD1 and VD2 - any rectifier, rated for a current of at least 2,5 A. Transistor VT1, except for that indicated in the diagram, can be of type KT818, KT816, it needs a heat sink with a surface area of at least 100 cm2. Instead of the operational amplifier K140UD6, you can use K140UD7, K544UD1. The integral stabilizer DA1 must be installed on the same radiator as the transistor VT1.
Author: Semyan A.P.
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