DC/DC converter generating two voltages. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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Communication over the RS-232-C bus is one of many examples where it is necessary to have a small board providing both positive and negative supply voltage. The circuit shown in the figure satisfies these requirements and contains much fewer components than similar devices, due to the fact that it simultaneously performs the functions of a step-up and an inverting inductive converter.
The basic circuit of such a converter includes a four-phase clock source, an inductor and two switches (Fig. 1).
Ris.1
During the first phase of the clock pulses, the inductor L is stored with energy through the switches S1 and S2. During the second phase, switch S2 opens and energy is transferred to the positive output voltage bus. During the third phase, both switches are closed, causing the inductor to store energy again. When switch S1 is opened during the final phase of the clock, this energy is transferred to the negative power rail.
In the practical circuit (Fig. 2), the D-flip-flop U1 generates four-phase clock pulses, and the transistors Q1 and Q2 act as switches.
Fig.2 (click to enlarge)
When clock pulses with a frequency of 8 kHz are received at the input, the circuit provides voltages of ±12 V to power the linear RS-232-C bus driver. The timing diagram (Fig. 3) shows the four phases of the clock.
Ris.3
Author: Steven Sarns; Publication: N. Bolshakov, rf.atnn.ru
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