SU1148078A1 - One-step d.c. voltage-to-d.c. coltage converter - Google Patents

Abstract

1. SINGLE-POWER CONSTANT VOLTAGE CONVERTER TO PERMANENT, containing power and control transistors, choke, the power winding of which is included in. 13 .... yi /. jg.-1. the output circuit of the power transistor, and the additional winding is connected between the power base and the emitter of the control transistor switches, characterized in that, in order to increase efficiency and reliability, it is equipped with a first diode connected between the control emitter and the emitter of the power transistors in the conducting direction. 2. The converter according to claim 1, wherein, in order to reduce the control power, it is equipped with a second diode connected between the base of the control and the base of the power transistors in the conducting direction. (L

Description

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The invention relates to a converter technique, in particular to adjustable converters and pulsed voltage regulators.

Known adjustable single-ended converters containing a transistor, a choke, a reed and a capacitor load filter Cl3.

The disadvantage of these devices is the relatively high power of the device for controlling them.

Closest to the invention is a single-cycle DC / DC converter, containing power and control transistors, a choke, the power of which is connected to the output circuit of the power transistor, the drive winding is connected between the base of the power transistor and the emitter controlling the transistor 2 .

This converter has no active locking and blocking potential on the bases of transistors in the closed state and as a result has low efficiency and reliability.

The purpose of the invention is to increase the reliability efficiency by reducing the assembled power when closing transistors and eliminating the possibility of their self-opening by maintaining an active locking and closing potential on the bases of transistors in the closed state

This goal is achieved by the fact that a single-ended voltage-to-voltage constant-voltage converter containing a power and control transistors, a choke whose power winding is included in the output circuit of the power transistor, and the additional winding between the power transistor base and the control emitter is equipped with the first a diode connected between the emitter of the control and the emitter of the power transistors in the conductive direction, in order to reduce the control power of the dc-to-dc converter It can be supplied with a second diode connected between the base of the control and the base of the power transistors in the conductive direction.

The drawing shows a diagram of a single-ended converter.

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The device contains a power transistor 1, a control transistor 2, an inductor 3 with an additional winding A connected between the base 5 of the power 1 and the emitter of the control 2 transistors, a rectifying diode 5, a filter capacitor 6 connected in parallel with the load. 7, the first diode 8, 8, included between the emitters of transistors 1, 2 and the second diode 9, connected between the bases of transistors 1,2.

When a control voltage is applied to the input of the device in positive polarity relative to the base

The 15 transistor 2 opens the transistors 2 and 1 and a current flows through the choke 3, which induces an emf in the additional winding 4.

Positive potential winding

20 is applied in the base of the power transistor 1, and a negative is applied to the emitter of the control transistor 2. The voltage of the winding 4 locks the diodes 8 and 9. The power transistor 1 5 opens to the minimum value of the residual voltage of the emitter-collector junction due to the positive base shift of the junction collector from the winding 4. In the interval

Q open state transistors

the load of the converter 7 and the capacitor 6 are disconnected by the diode 5 and the current through the inductor rises linearly from some initial to maximum value at the end of the interval. When the opening voltage is removed from the converter input, the transistor 2 closes. After that, the locking of the transistor 1 begins, which causes a decrease in the current through the choke 3 and an instantaneous change of the EMF on the winding 4. The positive potential of this source is applied to the emitter of the transistor 2 and through diode 8 to the emitter of transistor 1, and the negative potential to the base of transistor 1 and through diode 9 to the base of trans, resistor 2. As a result, active locking of transistors 1 and 2 occurs, reducing dynamic losses.

Next, the choke 3 is discharged to the filter capacitor 6 and the load 7. During the discharge time of droplets 55 3, a blocking voltage is maintained at the bases of the transistors 1 and 2, preventing the spontaneous switching of the transistors 1.2.

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The technical advantage of the proposed power during closures of the translatable converter as compared to resistors and in the exception of conditions

with a basic object, a prototype of self-opening, as a result of which efficiency and reliability are scattered in decreasing.

Claims (2)

1. SINGLE-STROKE CONVERSION-. TELES OF DC VOLTAGE TO DC, containing power and control transistors, a choke, the power winding of which is included in the output circuit of the power transistor, and an additional winding is connected between the base of the power and emitter of the control transistors, characterized in that, in order to increase efficiency and reliability, it equipped with a first diode connected between the emitter of the controller and the emitter of power transistors in the conductive direction. 2. The Converter according to claim 1, characterized in that, in order to reduce the control power, it is equipped with a second diode connected between the control base and the base of power transistors in the conducting direction. SU „1148078 1 114-8078