SU1398055A1 - Transistorized d.c. voltage colnverter - Google Patents

Abstract

The invention relates to electrical engineering. The goal is reliability by balancing. At the initial time, the symmetrization node automatically affects the power transistors 3, 4. When asymmetry occurs, one voltage of the converter on the secondary winding of the current sensor 19 or 20 produces a voltage causing current flow through the control winding of the throttles 12 (11) The feedback winding 10 (9) of the transformer 5 acts on the controls of the junction of the power transistor 3 (4), equalizing the duration of the half-cycles of the transducer, tel. 1 hp f-ly, 1 ill.

Description

(L

soo soo oo ate

one

The invention relates to electrical engineering and can be used in the sources of secondary power supply systems of radio engineering, automation and computer technology.

The aim of the invention is to improve; reliability of the converter by introducing a symmetry angle of the converter.

The drawing shows an electrical transistor converter circuit,

The transistor converter contains two input capacitors. 1 and 2 and two transistors 3 and 4, power i transformer with primary 6 and base I 7 and 8 windings, windings 9 and I 10 of negative feedback, two I double-winding droplets 11 and 12 with: switching windings 13 and 14, ballast resistors 15 and 16, including diodes 17 and 18 and current sensors 19 and 20, made, for example, as current transformers with primary 21 and 22 and secondary 23 and 24 windings. The converter balancing circuit is made on two double-winding chokes x 11 and 12 controlling the winding 13980552

the winding 6 of the power transformer 5 is the primary winding 22 of the current transformer 20 is a transistor, as a result of which the output voltage of the secondary winding 24 is an alternating voltage proportional in magnitude and opposite in sign to the flowing current of the primary winding 22. This voltage causes the magnetizing current to flow. nor, limited by the resistor 28, in the winding 26 of the throttles 12, which through the winding 10 of the negative feedback of the transformer 5 and the switching diode 18 affects the control transition of the transistor, which leads to the duration of the half cycles of the oscillator, and the voltage ripple at the output of the filter 30 becomes minimal. Practical equality of the amplitudes of the pulses of the rectified voltage at the output of the power rectifier 29 for the period of operation in the presence of asymmetry in the characteristics of the converter elements and when the load current changes is achieved using transistor current sensors and the introduction of double-winding into the circuit

15

20

25

The ki 25 and 26 of which are connected to the secondary windings 23 and 24 of the current transformers 19 and 20 through the resistor ZO chokes with a minimum size of 27 and 28. Secondary winding transform; torus 5 is connected to the terminals for i connecting the load through a rectifier

I 29 and filter 30. The converter provides

First female diodes 31 and 32, connected to parallels baso emitter junctions

i transistors 1 and 2 to protect the latter from breakdown by reverse voltage and DR chains 33, 34 and 35, 36 to reverse the magnetizing of chokes 11 and 12 in the opposite direction.

Transistor converter operates as follows.

Connecting a direct current to the mains leads to self-oscillations in the converter, whose frequency is determined by the parameters of chokes 11 and 12. Upon saturation

40

45

The coil of one of the chokes 11 and 12 currents in its windings alternately sharply increase, which causes the switching of transistors 3 and 4 of the converter. With differences in the characteristics of the elements and with a change in the load current, an asymmetry arises in one transducer arm, containing, for example, a capacitor 2 — the primary

55

device, which provides improved quality of energy output and increases the reliability of the device as a whole.

Thus, the new connections of the known elements in the symmetrization node determine the new property of the device: automatic, full alignment of the half-period duration in the transistors without the power transformer entering into saturation — at the moment of starting. This makes it possible to improve the quality of the output voltage. With relative simplicity of the device.

Claims (2)

1. A dc transistor converter containing two input capacitors connected in series between the first and second input terminals, the first and second transistors connected respectively to the collector and emitter to the first and second input terminals, the power transformer whose secondary winding is connected via a rectifier and filter output vyzdo chokes with a minimum size of 35 40 45 55 device, which provides improved quality of energy output and increases the reliability of the device as a whole. Thus, the new connections of the known elements in the symmetrization node determine the new property of the device: automatic, complete alignment of the half-period duration in the transistors without the power transformer entering into saturation at the moment of launch. This makes it possible to improve the quality of the output voltage. With relative simplicity of the device. Invention Formula 1. A constant-voltage transistor converter containing two input capacitors connected in series between the first and second input terminals, the first and second transistors connected respectively by a collector and an emitter to the first and second input terminals, a power transformer whose secondary winding is connected via a rectifier and filter output pins 1398055 mi, and the primary winding is connected to the wire, respectively, connected to the first pin to the junction point of the first emitter and the second collector capacitors, the base windings of the transistor, and its average output is are united through the ballast resistors to the keys to the second output of the primary transducer transistor junction, the coils of the power transformer, two negative winding circuits; secondary secondary windings of the current sensor connecting connections connected to control foams through the first and second resistors by switching off transistors through control-winding windings, the corresponding diodes and throttle windings are saturated with the first and second throttle reactors, characterized in that, to improve reliability, the windings are connected in series By balancing, sensor windings are introduced negative feedback. current, the second choke nascene, per-respectively the first and second left and second resistors and the first and 15 transistors, the second successive RD-circuit, interconnected 2. The converter according to claim 1, about t the switching-off diodes and the windings is negative in that each feedback and emitters of primary semi-windings and one in power transistors, with the extreme 20 manual windings located on a separate one. the conclusions of the primary winding of the sensor cores.