SU575744A1 - Stabilized dc-to-dc converter - Google Patents

Description

The invention relates to a converter technique and can be applied to supplying DC consumers with adjustable or stabilized voltage, in particular to powering radio equipment.

Stabilized voltage converters are known that contain a regulating element on series-connected thyristors, primary and secondary, the main thyristor blocking unit, the output filter, the comparison unit, which forms the main thyristor and additional thyristors and the synchronizer 1. The synchronizer is a separate device, not connected to the block, lock the main resistor. Therefore, when changing the parameters of the block lock, which almost always takes place in mass production, it is necessary to additionally adjust the synchronizer. This makes the converter low-tech, with the first use.

The proposed converter differs from the known one in that the driver of control pulses of the additional thyristor and the synchronizer are made in the form of a throttle, rectifier, and pulse amplifier. The primary winding of this throttle is connected between the input terminal for connection to the source

power supply and the main thyristor, and its secondary winding is connected through a straightening, to the input of the pulse amplifier, the output of which is connected to the control electrode of the additional thyristor. This allows you to simplify the converter, to improve its manufacturability.

FIG. 1 shows the electrical circuit of the converter; in fig. 2 - timing diagrams that show the operation of the converter.

The converter contains:

in the power circuit: the primary winding 1 throttle, main thyristor 2, capacitor 3. additional thyristor 4, output filter diode 5, choke b, capacitor 7, load 8;

in the control circuit: the comparison unit 9, the driver of the main thyristor control pulses 10, the secondary winding 11 of the drossel, the rectifier-dyod 12, the capacitor 13: the pulse amplifier transistor 14, the resistor 15, the capacitor 16, the diode 17, the transistor 18, the transformer 19 .

The primary winding 1 of the throttle forms, with condensate bridge 3, the blocking device of the main thyristor 2. Both windings 1 and 11 of the throttle with the rectifier and the pulse amplifier are simultaneously the synchronizer and driver of the control pulses of the additional thyristor.

When the output voltage deviates from the nominal value, the comparison unit 9 generates a signal to the driver 10 of the main thyristor 2, and this thyristor opens. In this case, the voltage of the capacitor 3 on the capacitor 3 increases as a result of the oscillatory process in the blocking unit to double the input voltage (Fig. 2, a), the thyristor 2 closes and the current r flowing through it drops to zero (Fig. 2, b) . The law of change in current ii determines the form of the voltage on the secondary winding of 11 droplets (Fig. 2, d).

The voltage Ugp is rectified by diodes 12, as a result of which the shape of the voltage U, on the capacitor 13 approaches the square-wave pulses (Fig. 2e). In this case, the leading edge of such a pulse opens the transistor 14, and the capacitor 16, previously charged before the supply voltage of the amplifier Un, is discharged through the transistor 14 and the diode 17. The rear edge of the pulse b closes the transistor 14 and opens the transistor 18, while the transformer 19 forms pulse of control current for additional thyristor iq (Fig. 2, g). The latter opens, and the current i2 through it flows to the full discharge of the capacitor; 3 (Fig. 2, c). The capacitor 16 is charged through the resistor 15 and the transistor 18 to the voltage Uri. He compared the diagrams of control currents of the main (Fig. 2, e) and additional (Fig.

2, g) thyristors io and ig, we see that the operation of the circuit turns out to be clearly synchronized.

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Claims (1)

1. Patent of the Netherlands No. 126973, cl. 92, 1969. + iJfulX / v-vx.  I, / irnupvc torus nineteen H Tnupucmofjy2 n ABOUT ABOUT i2 0 dp 2T 2G 2T d well FIG. 2 2J 2T i i 2T