SU1345300A1 - Push-pull d.c. voltage converter - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used in converter equipment and power supply devices. The aim of the invention is to increase efficiency by improving the shape of the output voltage. The device contains in each arm a power transistor 23, the base circuit of which through diodes 17, 19, 21 is connected to the control winding 3, protected. standard RC circuit. The capacitor 7 of the KS circuit is connected to the input of the auxiliary transistor, which switches on the regulating transistor 11. The power transistors most of the half-cycle operate in the fixed mode and are output to the unsaturated one; losses at elimination of through currents. 2 Il. (About f-ff CO 4 ate with Oh J-er

Description

The invention relates to electrical engineering and can be used in converter equipment and power supply devices.

The purpose of the invention is to increase the CSD by improving the shape of the output voltage.

FIG. Is a diagram of the device; fig 2 is a diagram of his work.

The converter contains a master oscillator 1 with an output transformer 2 with control windings 3 and 4,

20

Control windings 3 and 4 are shunnty-15 frequency inverters for voltage

400-600 V, it is recommended to turn on the diodes, which allows you to limit the depth of the transistor, especially in modes close to idle.

As follows from the timing diagrams (FIG. 2) in the device (FIG. 1), the static losses due to a change in the operating mode of the transistor and 25 times decrease the dynamic losses due to a decrease in the degree of saturation of the power transistor and the reliability of the device increases.

KS-circuits containing resistors 5, b and capacitors 7 and 8, and connected through resistors 9, 10 to emmeters of regulating resistors 11; 2 “bases of which, through resistors 13 and 14, are connected to collectors of auxiliary transistors 15, 16 The emitters of control transistors 11 and 12 through diodes 17-22 are connected to bases of power transistors 23, 245 whose collectors are connected to collectors of recording transceivers vTiHCTOpOB through diodes 25, 26 ,

The device works as follows.

Suppose that at time s, (fig 2) the power transistor 23 is open by wounding the control of winding 3 (U (j) j and the transistor 24 is closed by controlling the winding 4, At this time the capacitor 7 is charged through the resistor 5 and winding 3 (111) ,, Transistors J; 15 are closed, non-linear feedback is disconnected. The power transistor 23 operates in the saturation mode,

At the moment of time tfig, 2) the voltage value ia of the capacitor increases to the level of the opening voltage of the transistor 15; a current (Uj) j is opened by the resistor 13, the transistor II is opened, and a feedback current is applied in the circuit of diode 25. As a result, the non-linear feedback yl yields the base current of the power transistor 23 (n, j) and the voltage And increases to the voltage U i,: the boundary (Uj,) At time t, (FIG 2) there is a change, the polarity of the governing impulse. Formula

and

gaining

35

40

45

50

A push-pull DC-DC converter containing a power transistor in each arm, the base and emitter circuit of which is connected to the control winding podk.ozotochnoy KS circuit through the base resistor, the middle point is connected to the base of the auxiliary transistor, about l and In order to increase efficiency by improving the shape of the output voltage, the base-emitter transition of the auxiliary transistor is connected to the capacitor of the KS circuit, and the collector is connected to the base of the input regulate transistor, the emitter circuit of which is connected to the power transistor circuit, in which N diodes are sequentially inputted, and the collector circuit is connected to the collector of the power transistor according to the connected diode.

On windings 3, A, the transistor 23 is closed by S and Transistor 24 is opened, capacitor 7 is discharged across a circuit of resistor 5, winding 3. At the same time, capacitor 8 begins to charge and the processes are repeated in the same sequence. The output voltage of the inverter Ug is shown in the timing diagram (Fig 2).

In that case, if the power transistors have a large inertia, for example. when creating a high formula

and

gaining

five

0

five

0

A push-pull DC-DC converter containing a power transistor in each arm, the base and emitter circuit of which is connected to the control winding podk.ozotochnoy KS circuit through the base resistor, the middle point is connected to the base of the auxiliary transistor, about l and In order to increase efficiency by improving the shape of the output voltage, the base-emitter transition of the auxiliary transistor is connected to the capacitor of the KS circuit, and the collector is connected to the base of the input regulate transistor, the emitter circuit of which is connected to the power transistor circuit, in which N diodes are sequentially inputted, and the collector circuit is connected to the collector of the power transistor according to the connected diode.

Compiled by T.Ershova Pt, ViKTOp I.Slobod nickname TehredLoolshyk Corrector I.Shulla

Download .4929 / 53 Circulation 639Subscribe

VNIIPI State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Roy-July t-polygraphic enterprise, Uzhgorod, Proektna st., 4

2

Claims (1)

Claim A push-pull DC-voltage converter containing a power transistor in each arm, the base and emitter circuit of which is connected through the base resistor to a control winding connected to the RC circuit, the midpoint of which is connected to the base of the auxiliary transistor, with what I am, s. In order to increase the efficiency by improving the shape of the output voltage, the base-emitter junction assists to the opening voltage level of transistor 15, current (Ts) flows through resistor 13, transistor I opens, feedback current flows in diode 25 circuit. As a result of the action of nonlinear feedback, the base current of the power transistor 2.3 (U ₄ ) decreases and the voltage U _k rises to a voltage U _m boundary (U ₅ ). At the moment (Fig. 2), a change occurs, the polarity of the control of the pulse transistor is connected to the condi-; an RC circuit, and the collector, through the introduced first resistor, to the base of the introduced control transistor, the emitter circuit of which is connected to the main transistor, into which N diodes are sequentially inserted, and the collector circuit is connected to the collector of the power transistor according to the connected diode. 1345.300