SU1644315A1 - Device for heavy duty transistor key control - Google Patents

Abstract

This invention relates to a converter technique and can be used in key regulated power amplifiers and the like. The purpose of the invention is to increase the reliability and expand the functionality of the device. For this, at high potential at the input of the device, the control transistors 6 and 7 are closed, and the locking transistors 8 and 9 alternately connect the ends 4 and 5 of the saturating winding of the transformer 1 to the emitter of the power transistor 3, providing at its base the locking potential. At low potential at the input of the device, the control transistors 6 and 7 in turn connect the corresponding ends of the saturating winding to the collector of the transistor 3, providing it with a saturation mode. At this time, the latching transistors 8 and Ј are closed by the voltage supplied through diodes 17 and 18 from the source 12 of antiphase voltages. So the reliability of the device is increased, and the limitation on the upper switching frequency of the power transistor 3 is also eliminated, since The switching current of the magnetization of the transformer 1 is not connected with the switching of the current of the power transistor 3. 2 Il. (C (L

Description

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The invention relates to a converter technique and can be used in key regulated power amplifiers, converters of direct voltage to alternating voltage.

The aim of the invention is to increase the reliability and expand the functionality of the device.

FIG. 1 is a schematic diagram of the device; in fig. 2 - time diagrams that show the work.

The device contains a transformer 1 with a saturating winding, the middle pin 2 of which is connected to the base of the power transistor 3, and the extreme leads 4 and 5 are connected to the emitters of the control transistors 6 and 7, blocking the transistors 8 and 9, the combined collectors of which are connected to the emitter of the power transistor 3 , and the base-emitter transitions through limiting resistors 10 and 11 are connected to opposite ends of the saturating winding of the transformer 1, the source 12 of two antiphase voltages, the outputs 13 and 14 of which are connected through terminating resistors 15 and 16 actuating bases of transistors 6 and 7, and through the diodes 17 and 18 - with the locking bases of transistors 8 and 9,

The device works as follows.

In the time interval (Fig. 2) at high potential at the input of the device Uvh, the output voltages of source 12 (/ is and (/ 14 are zero). At the same time, the control transistors 6 and 7 are closed, and the locking transistors 8 and 9 are opened in turn, connecting the ends 4 and 5. saturating the saturation mode. During the open state of the power transistor, the locking transistors 8 and 9 are closed by the voltage flowing through the diodes 17 and 18 from the source 12.

Thus, in the device due to the introduction of the locking transistors operating as a controlled synchronous voltage converter on the saturating winding, as well as due to the separate

10 transistor control using a source of anti-phase voltages, it became possible to simplify the circuit and, consequently, increase the reliability of the device and extend its functionality -

15 to exclude the limitation on the upper switching frequency of the power transistor, since the switching of the magnetizing current of the transformer is not connected with the switching of the current of the power transistor.

20

Claims (1)

Invention Formula 25 A device for controlling a power transistor switch containing a transformer with a saturating winding and two control transistors, the collectors of which are connected to the collector of the power transistor of the key, the emitters are connected to the extreme terminals of the saturating winding of the transformer, the middle output of which is intended to be connected to the base of the power key transistor 3Q , characterized in that, in order to increase reliability and expand the functionality of the device, two locking transistors, two diodes, four resistors are introduced and the source is two antiphase voltages, winding to the emitter of the power transistor, each of the outputs of the two-phase voltage source through the first and second resistors, respectively, is connected to the base of the corresponding control transistor, and through the corresponding diode and base-emitter transition of the corresponding resistor 3 and providing a locking potential on its base (/ Be3. The output voltage of the transistor switch (Lyh has a high level. In the time interval (Fig. 2) with low potential l / in input device + and the current gate transistor - with anti-phase pulses (/ and and (/, synchronous with the voltage pulses on the saturating winding of the transformer 1 ((/ 4-2, emitter of another control transistor, the collectors of the blocking transistors are intended to be connected to the emitter of the power transistor of the key, and the bases through (/ s-z). At this time, the governing transis-. the third and fourth resistors, the correspondents 6 and 7, in turn, connect the corresponding ends of the saturating winding to the collector of transistor 3, providing but connected with opposite to their emitters pins of the saturating winding of the transformer. him saturation mode. During the open state of the power transistor, the blocking transistors 8 and 9 are closed by the voltage flowing through the diodes 17 and 18 from the source 12. Thus, in the device due to the introduction of the locking transistors operating as a controlled synchronous voltage converter on the saturating winding, as well as due to the separate controlling transistors with the help of a source of antiphase voltages, it became possible to simplify the circuit and, consequently, increase the reliability of the device and expand its functionality - eliminate the limitation on the upper switching frequency of the power transistor, since the switching of the magnetizing current of the transformer is not related to the switching of the current of the power transistor. 20 Invention Formula five A device for controlling a power transistor switch containing a transformer with a saturating winding and two control transistors, the collectors of which are connected to the collector of the power transistor of the key, the emitters are connected to the extreme terminals of the saturating winding of the transformer, the middle output of which is intended to be connected to the base of the power Q transistor of the key , characterized in that, in order to increase reliability and expand the functionality of the device, two locking transistors, two diodes, four resistors are introduced and the source is two antiphase voltages, emitter of another control transistor, the collectors of the blocking transistors are intended to be connected to the emitter of the power transistor of the key, and the bases through but connected with opposite to their emitters pins of the saturating winding of the transformer. FIG. I