SU826531A1 - Controllable inverter - Google Patents

Description

(54) REGULATED INVERTER

one

The invention relates to electrical engineering and can be used in secondary power systems for converting a constant voltage into an adjustable - (stabilized) alternating or constant voltage by inverters,

 Known adjustable inverter containing the output transformer,. the primary winding of which is connected to the input through the control keys. through the series-connected choke ij.

The disadvantage of this inverter is that during part of the period when both controlled keys of the inverter are simultaneously open, energy is consumed from the source, but not transferred to the load, which leads to an increase in size, mass and power loss.

An adjustable inverter is also known, which contains an output transformer and an additional transformer whose primary winding is connected in parallel to the main switch-g via additional controlled keys. mg:, and the secondary winding is connected via a rectifier to the output of inverter 2.

The disadvantage of this solution is the limitation on the type of load, since this inverter can work only on a direct current load.

The purpose of the invention is to expand the functionality of the inverter, namely the provision of work

on the load AC, mixed and multi-channel load. ..and

This goal is achieved by the fact that in a regulated inverter containing an output transformer, the primary winding of which is connected to the inverter input terminals through main control switches and a series-connected choke, and the additional transformer whose primary winding is connected in parallel to two main controls through additional control keys keys, the secondary winding of an additional transformer through a rectifier is connected to the input circuit of the inverter.

FIG. 1 shows a variant of the proposed inverter circuit; in fig. 2 - control pulse diagram; Fig, 3-bridge version of the proposed scheme,

In the regulated inverter, the input terminal 1 is connected through the winding 2 of the choke 3 to the common point of the primary windings 4 and 5 of the output transformer 6. The indicated primary windings are connected to the second input terminal 9 through the main control switches 7 and 8.

An adjustable inverter contains an additional transformer 10, the primary winding 11 of this transformer is connected via an additional control key 12 in parallel with a switch 7, and the primary winding 13 via an additional switch 14 is connected in parallel with a controlled switch 8. The secondary windings 15 and 16 of an additional transformer 10 through a rectifier, formed by diodes 17 and 18 are connected to input pins 1 and 9.

The control electrodes of the power switches 7, 8 and 12, 14 are connected to the outputs of the control unit 19.

The secondary trimming of the output transformer is connected to the load, shunted by a capacitor, through a rectifier. The number of secondary windings, the number and type of loads (direct or alternating current) does not change the principle of the device and can be increased.

The principle of the proposed adjustable inverter is as follows.

The control unit 19 implements the algorithm of the operation of the keys shown in FIG. 2, where the state is on, corresponds, and the state is off - O.

Winding 2 droplets 3 acts on the power circuit of an adjustable inverter as a current source. When the keys 7 and 12 (or only the key 7) are open at the same time, the energy is transmitted only through the transformer 6 to the load. When the key 7 is in the open state, and the key 12 is in the closed state, energy continues to flow into the load through the transformer 6 and partially returns to the power source through the transformer 10.

If Y is the part of the full-period of operation of the converter, to which energy is transmitted only through transformer 6, then the following adjustment characteristic of the proposed device follows from the power balance equation

,, (.,

where Uu is the load voltage e,

reduced to the primary winding of the transformer 6, and

p 9-VN ",, bU, v

For the circuit in FIG. 1, the continuity of the current transmitted to the load through the transformer b is characteristic, and the step form of the current (without dips down to zero) consumed from the power source.

An embodiment of the converter is possible in which the windings 15 and 16 of the auxiliary transformer 10 are connected via a rectifier formed by diodes 17 and 18 to the end of the winding of the throttle 3 connected by the connection point of the windings 4 and 5 (dotted line in FIG. 1)

In this case, the adjustment characteristic of the converter is:. g

-

1-t

moreover, the current consumed from the power source is continuous, and the current transmitted to the load via transformer b is stepwise. In this case, the load can be switched on only through a rectifier with a capacitive filter,

In the bridge circuit of FIG. 3, the primary windings 4 and 5, the transformer b (t, e, made in the form of a single winding 4-5), as well as the primary windings 11 and 13 of the transformer 10, are combined. A pair of main keys of the bridge circuit 20-21, which connected to the main switches 7 and 8 through the primary winding 4-5 of the power transformer 6, are switched alternately and closed each by: half the operating period of the adjustable inverter. Keys 7, 8, 12, and 14 operate in accordance with the algorithm described above (FIG. 2). Variants of the circuits (figs, 1 and 3) can work both on the load connected via the rectifier current and on the AC load connected directly to the secondary winding of the transformer 6,

Claims (2)

Invention Formula 1, the Variable Inverter, containing the output transformer, the primary winding of which is connected to the input terminals of the inverter through main controlled keys and the series-connected choke, and an additional transformer whose primary winding is connected in parallel to two main control keys characterized in that, in order to extend the functionality, the secondary winding of an additional transformer is connected to the input circuit through a rectifier torus. 2, Inverter POP.1, characterized in that the secondary winding of the auxiliary transformer is connected via a rectifier to the input terminals of the inverter. 3. The inverter according to claim 1, characterized in that the secondary winding of the additional transformer is connected between one of the input leads of the inverter and one of the leads of the throttle, the other lead of which is connected to the other input lead of the inverter. m 2 / p / 7 / ha Sources of information taken into account during the examination 1. Moin B.C., Laptev N.N. Stabilized transistor converters. Energy, 1972, p. 206, fig. 7-4. year 2.Certificate of the USSR on the application In 1962374 / 24-07, cl. H 02 M 7/537, 1973. GO / 5У fj-fj sixteen . 4-5