SU526991A1 - DC to DC converter - Google Patents

Description

one

The invention is intended to power various electronic devices with a differential load, requiring two different polarity power sources with a common point.

Known transducers of direct voltage to two different polarity sources require the inclusion of a throttle or output transformer or are complex according to the scheme. The disadvantages of these converters include low reliability, relatively low efficiency. and large dimensions.

The closest to the invention to the technical essence is a converter, which is assembled on a symmetric multivibrator with an output transformer and a rectifier.

The disadvantages of this converter include low reliability and significant size due to the use of a transformer.

The aim of the invention is to create two different polarized DC sources having a common point with the thickness of the power source while increasing the reliability and simplification of the converter. The goal is achieved by connecting one diagonal of the bridge through capacitors to the outputs of a symmetric multivibrator, and the other through an output voltage divider

pax to KopnycHoii source of food. In this case, a symmetric source is formed with a voltage of -. When 1 is connected

One of the extreme leads of the output divider to the cornet spine of the power supply is formed by one source of reverse polarity, which BiMecTe with the power supply forms a symmetric source with voltage Ец.

FIG. Figure 1 shows the circuit of the proposed converter with a symmetric voltage source.

Transistors 1-4, resistors 5-8, capacitors 9, 10 and diodes 11, 12 form a symmetric multivibrator 13 circuit. One bridge diagonal on diodes 14-17 through capacitors 18, 19 is connected to the outputs of the multivibrator arms (point a, b), and the other is a diagonal through a voltage divider on resistors 20, 21 with an enclosed bus supply source of the EP.

The Converter operates as follows.

Let transistor 1 be open at an arbitrary time, and transistor 2 closed, transistor 3 closed and transistor 4 open. Condenser 18 is discharged through diode 11, open transistor 1, resistor 21 and diode 14, as a result of which I2 . If we neglect the drop on the diodes And, 14 and the transistor 1, then the source voltage Hz is equal to the voltage on the capacitor 18 (U2.-f / Ci). The capacitor 19 is charged from the power source E through the open transistor 4, the diode 15 and the resistor 20, as a result of which the voltage of the source Ui being formed is generated. If we neglect the voltage drop across the diode 15 and the transistor 4, then the value of the voltage of the source Hi is equal to the difference of the voltage of the supply of the EP and the voltage of the capacitor 19 (f / i).

After tilting the multivibrator 13, the transistors 1, 4 are closed, and the transistors 2, 3 are open. The capacitor 18 is charged from the power source through the open transistor 3, the diode 16 and the resistor 20, as a result of which the voltage U b is generated with the value of bl En-UCi. The capacitor 19 is discharged through the diode 12, the open transistor 2 and the resistor 21, as a result of which the voltage source Uz is formed by a magnitude.

After the next tilting of the multivibrator 13, the formation period of the sources f / i and Uz is completed. The variation of resistors 20, 21 of the divider establishes the equality of the voltages on the capacitors 18 and 19. In this case, the voltages of the generated sources Ui and Uz are equal.

Hi P

 +

13 17

FIG. 2 shows a diagram of a symmetric source with a voltage of Eptransducer in FIG. 2 corresponds to the converter of FIG. 1, only one of the outermost terminals of a voltage divider is connected to the body bus only (for the case when the body bus is plus a power source, the connection is shown as a dotted line). Accordingly, the voltage / i 0, and the voltage Hz EP.

Claims (2)

1. Constant voltage converter to constant, containing symmetric multivibrator, additional capacitors, diode: bridge AND OUTPUT voltage divider, distinguished by the fact that, in order to increase reliability and simplification, one diagonal of the diode bridge through These capacitors are connected to the outputs of the multivibrator, and the other, through the aforementioned divider, to the body bus, is one of the input terminals. 2. A converter according to claim 1, characterized in that, in order to obtain two different polarity voltages with a common body rail, one of the extreme ends of the divider is connected to said body rail.