Increasing the output power of stabilized power supplies. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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Many integrated voltage regulators provide an output current of no more than 1,5 A. But it is often necessary to obtain a large output power while maintaining the quality of output voltage stabilization.
There are various ways to solve this problem. One of them consists in parallel connection of several identical integral stabilizers. But due to the inevitable technological spread of the parameters of individual stabilizers, their output voltages always differ somewhat from each other.
With the parallel operation of the stabilizers, these differences lead to an uneven distribution of the total load current between the stabilizers: some of them have a maximum output current, while others are negligible or even in the off state.
To ensure a uniform distribution of currents, the use of rather complex leveling devices is required here.
It is more preferable to use external power transistors, which are very simply combined with an integrated stabilizer and provide a significant increase in the output current of the power supply.
One such source with an integrated regulator 7805 (U1), shown in Fig. 5.73, contains the following components: electrolytic capacitor C1 - 1000 uF, 35 V; diodes VD1-VD4 -50 V, 8 A; resistor R1 - 6 0m, 0,5 W; transistor VT - 2N 3792; fuse F1 - 0,5 A.
The transformer has an output voltage of 6,3 V and a rated current of 6 A.
Please note that a pnp transistor is used to increase the output power, the collector of which is connected to the output of the power supply, and the emitter is connected to the output of the rectifier.
The base of the transistor must be connected to the input terminal of the stabilizer, and the resistor R1, connected between the emitter and the base of the transistor, ensures the normal operation of the latter.
When creating a practical device, the transistor, as well as the stabilizer, should be equipped with a suitable type of heat sink.
Author: Treister R.
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Comments on the article:
Jury
The voltage of 6,3 V for the 7805 chip is small. It needs at least 8 V. Otherwise, there will be no voltage stabilization.
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