SU1309218A1 - Variable d.c.voltage-to-a.c.voltage converter - Google Patents

Abstract

The invention relates to electrical engineering, namely to secondary power sources. The purpose of the invention is to increase efficiency by changing the losses in the shrinking contour. The converter contains transistors (T) 1, 2 pnp type, shunt diodes 3 and 4, differential load 5, control nodes 7 and 8, diodes 11 and 12 shorted, T 9 shorted pnp type. The introduction of a T 10 shorter pp type, controlling T 13, 14 pnp type, diodes 17 and 18 ensures that the entire differential load 5 and 5 shrink, which leads to a decrease in power loss. 2 3. Clause f-ly, 1 ill. (About with about from 00

Description

The invention relates to electrical engineering, in particular to converter equipment, and can be used in devices 1 of radio engineering devices for various purposes.

The purpose of the invention is to increase the efficiency by reducing the losses in the circuit shorter and.

The drawing shows a DC / AC converter circuit.

The converter contains the first and second 2 power transistors of pnp type, the first 3 and second, 4 shunt diodes in the arms, differential load 5 (5 and 5), the source 6 of the supply voltage, the sources 7 and 8 of the control signals, the first 9 and the second 10 transistors are shorter type pnp, the first 1 1 and second 12 korochek diodes, the first 13 and second 14 control transistors, the first 15 and second 16 thyristors, the first 17 and second 18 cut diodes, the first 19 and second 20 isolating diodes, first 21, second 22, third 23, fourth 24, fifth 5, sixth 26 resistors, first 27 and second 28 fixing elements - zener diodes. Moreover, for transistors 29-34, the emitter-base junction is 1-tuned by the corresponding resistors 35-40, and for each thyristor 41 and 42, the control electrode is connected through the corresponding resistors 43 and 44 to the thyristor cathode.

An adjustable DC / AC converter works in a consistent manner.

Statically, the control signal sources do not arrive at the inputs of the adjustable converter. The monitoring transistors 13 and 14 are in the open state, therefore, the transistors 9 and 10 are also short. The load voltage is zero.

Suppose that in dmikoy the power transistor 1 is closed by the voltage of the control signal source 7, and the power transistor 2 is open by the unlocking voltage of the control signal source 8 and the full voltage of the power source 6 is applied to the load (half-winding) 5. Due to the mutual induction on the load (the other half-winding 5), an emf is induced, which through the shorter diode 1 1 is applied to the diode, 12 shorter and locks it. The shortening transistor 9 is locked by the installation of a cutting diode 17 (the inverse switching mode of the shorter transistor is eliminated). The transistor 10 is shorted and counter-wired. The 1Tc transistor 14 is closed.

When the power transistor 2 is turned off (in pause) by the voltage of the control signal source 8, the transistor 10 is opened when the control transistor 14 is opened and the load current 5 is closed through the load 5, the transistor 9 is short and the diode 12 is short.

When the power transistor G is turned on, the controlling transistor 13 and shorter transistor 9 are turned off. The shorter diode 11 is locked by the EMF of mutual induction of the load 5.

Thyristors 15 and 16 provide protection of the adjustable converter against the flow of through currents until one of the shoulders of the adjustable converter is open, the other shoulder cannot be turned on, since the thyristor is closed, controlled from the type-negative shoulder.

The introduction of a shorter circuit covering both loads 5 and 5 leads to a decrease in power loss, and, consequently, to an increase in efficiency.

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Claims (3)

1. Adjustable DC / AC converter containing two power transistors of pnp type with shunt diodes, differential load, the extreme terminals of which are connected to the collectors of power transistors, and the middle output is to the first output 0 power supply, to the second output of which the emitters of power transistors are connected, two shorter diodes, anodes connected to the extreme terminals of the differential load, the cathodes of which are combined and connected to the emitter of the first 5 transistor of the shorter pn-type, different from that In order to increase efficiency by reducing losses in the shunt circuit, a second shunting transistor, a tin type, has been introduced, a pn-type control transistor, two cut-off diodes and four resistors, and the emitter of the second transistor is shorter dinene with the emitter of the first, and the collectors of each of them are connected by anodes cutting diodes, the cathodes of which 5 are connected to the extreme terminals of the differential load, the basic terminals of the shorter transistors are connected through the first and second resistors to the collectors of controlling transistors, the emitters of which are combined with the emitters of power 0 transistors, and the base terminals through the third and fourth resistors are connected to the extreme terminals of the differential load. 2. Converter in n. 1, distinguishing 5 with the fact that two additional thyristor and two decoupling diodes, with the connection of the extreme conclusions of the differential load to the power collectors 0 3,13092184transistors are made through the added-divided third and fourth body thyristors, and control electrical resistors. each of them through the appropriate 3. A converter as claimed in claim 2, distinguishing between a coupling diode and a cathode connected in that each connection point of two to the control electrode, the crossover-5 of the mentioned resistors is connected via but with a junction point of two follower-zener diode to the second output of the source but included resistors, for which times the power supply.