SU665385A1 - Synchronizable voltage converter - Google Patents

Description

i

The invention relates to static converter control devices, which are used as secondary power sources of special devices, communication means, etc.

A voltage converter synchronized by single-pulse pulses is known. A disadvantage of the known synchronized voltage converter to be reduced; is that the synchronization of a single-pulse does not provide a clear control, and fails, because it depends on the nature of the load (in particular, when the capacitive nature of the load) ...

In the well-known scheme, the elimination of this drawback is achieved by using additional chokes, i.e., complicating the circuit at the expense of additional coiler elements, since these coil elements are large (especially for low frequencies 50, 400, 1000 Hz) in size and size. A synchronized voltage converter is also known, which contains controllable keys that are connected to each other by a positive feedback circuit, with one lead for connecting the clock source connected to a common thickness and the other to the same electrodes of two decoupling diodes 2. This device is

the closest to the technical nature of the invention. However, it also has drawbacks, in particular, it has a low reliability of operation, due to the instability of synchronization, especially when changing the type of load (R, C, L).

The aim of the invention is to increase the reliability of the synchronized voltage converter. To achieve this goal, the other electrodes of each dissociating diode in it are connected via resistors to the outputs of controlled switches, respectively, and the points of connection of these electrodes to resistors

through synchronization chains consisting of series-connected capacitors and limiting resistors, they are cross-connected to the inputs of controllable switches, while the inputs are bounded by additional diodes.

The drawing shows a circuit diagram of a synchronized voltage converter on the example of a synchronized multivibrator on

transistors. The source of the synchronizing signal is also made in the form of a mz litivibrator.

The synchronized voltage converter contains a controllable key on

a transistor 1, a synchronization circuit consisting of a series-connected capacitor 2 and a limiting resistor 3, with one end through diode 4 among the common length and the other end through resistor 5 with the collector of transistor 1. Condenser 6, locked key on transistor 7 The collector of which is connected through a series-connected resistor 8, a capacitor 6 and a limiting resistor 9 of the second synchronizing circuit to the base of transistor 1. The connection point of the capacitor 2 and resistor 5 is connected via diode 10 to the output for connecting a source of clock signals. Winding 11 transformer 12 collector load transistors

1 and 7 through a series resistor 13 is connected between the bases of transistors 1 and 7. A diode 14 is connected in parallel with the base-emitter junction of transistor 1, a diode 4 is also connected with a transistor 7. The diode electrode 15 is connected to the diode electrode 10, which is connected to the output to connect the source of synchronization signals, and the other electrode of the diode 15 - with the point of connection of the capacitor 6 and the resistor 8. The emitters of transistors 1 and 7 are connected to a common bus.

The scheme works as follows.

For example, the output transistor of the synchronizing multivibrator and the transistor 1 of the synchronized multivibrator are open.

Precharged capacitor

2 is discharged through the limiting resistor 3, diode 4, resistor 5 and the emitter-collector section of the open transistor 1. The capacitor 6 is charged to the voltage t / ec of the closed transistor 7 through the collector load of the transistor 7, the resistor 8, the limiting resistor 9 and the base-emitter junction open transistor 1.

By the time of switching transistors synchronizing multivibrator

condensation 20; copdance 6 2 t / miT THEREFORE

when the output transistor 1 is closed, the input of transistor 7 through the capacitor 2, the diode 10 and the resistor 3 will receive an unlocking signal from the f / ec of this transistor.

No signal arrives at the input of transistor 1 through capacitor 6, since this capacitor 6 is already fully charged.

This combination of signals will switch the transistors 7 and 1, the transistor 7 will open and the transistor 1 will close. In the future, this mode is supported by a positive feedback circuit connected between the bases of transistors 1 and 7, made in the form of a winding 11 belonging to the output transformer 12 of the synchronized

a multivibrator and a series-connected resistor 13.

Before the next switching, the capacitor 6 is discharged through the resistors 8, 9, 5, the diode 14 and the emitter-collector section of the open transistor 7, therefore, when the output transistor closes, through the specified capacitor 6, the resistor 9, the diode 15 enters the closed transistor 1

0 unlocking signal from the t / eq of the output transistor, etc.

The drawing shows a converter circuit in which synchronization is performed by unlocking a closed before

5 transistors. This circuit is easily transformed into a circuit with synchronization on locking. To do this, it is enough to switch the decoupling diodes 10, 15 (shown in dotted lines in the drawing). Chain positive

0 feedback in considered multivibrators is made in the form of windings of output transformers. When performing a synchronized voltage converter on type 2T608 transistors

5 As capacitors 2 and 6, it is desirable to use small-sized capacitors of type KM with a capacity of 10,000–15,000 pF.

A comparative analysis of the synchronized voltage converter with the known ones has shown that the advantage of the proposed device lies in the high reliability of its operation with low weight and dimensions.

Claims (2)

Invention Formula A synchronized voltage converter containing controllable keys that are interconnected by a positive feedback circuit, and one lead for connecting a clock source is connected to a common length, and the other is connected to the same electrodes of two disconnecting diodes, characterized in that, in order to increase the reliability of its operation, the other electrodes of each decoupling diode are connected via resistors respectively to the outputs of controlled keys , and the points of connection of these electrodes with resistors through synchronization chains consisting of series-connected capacitors and limiting resistors are cross-connected to the inputs of ravl proxy key, these additional inputs zaschuntirovany diodes. Sources of information taken into account in the examination I. USSR author's certificate No. 296199, cl. H 02 M 05/04, 1969. 2. Moin V.S., Laptev N.N. Stabilized transistor converters, M., “Energy, 1972, p. 307, fig. 9-3.