SU813394A1 - Stabilized converter - Google Patents

Description

(54) STABILIZED CONVERTER

one

The invention relates to electrical engineering and can be used in power supplies for automation and computer technology.

A stabilized converter comprising a bridge transistor power amplifier, an output transformer, an output rectifier and a filter, a control unit, a protection node, made on a current transformer, whose output winding through a rectifier and amplifier is connected to one of the inputs of the control unit, and the input winding in series with the known The input winding of the output transformer is included in the diagonal of the bridge power amplifier 1.

The disadvantages of this converter are the dynamic losses in the transistors of the bridge amplifier at the moment of switching off and the lack of protection of the device against through currents.

The RC chain is also known, which allows to reduce the dynamic losses when the transistors 2 are turned off.

When this RC-chain is introduced into the bridge power amplifier, a pulsed charging current of the RC-circuit flows through the transistors, which is perceived by the current sensor as an overload signal.

The purpose of the invention is to increase reliability and enhance functionality.

Claims (2)

The goal is achieved by the fact that in a stabilized converter containing a bridge transistor power amplifier, the diagonal of which includes the primary winding of the output transformer, the output winding of which is connected to the output of the converter through a rectifier and filter, the protection node, made on the current transformer, the output winding of which The rectifier and amplifier are connected to one of the inputs of the transistor control unit of the bridge power amplifier, the other input of which is connected to the output of the converter, and p An additional RC chain to reduce dynamic losses, an additional winding of the current transformer is inserted, connected in series with the RC chain, and forming a circuit is connected parallel to the input winding of the output transformer, the input winding of the current transformer is connected to the collectors of transistors of adjacent shoulders of the bridge power amplifier and the middle one output with input power. The drawing is a schematic diagram of the device. The circuit consists of a bridge power amplifier with transistors 1, 2, 3, and 4, an output transformer 5 included in the bridge diagonal, the output winding of which through a rectifier 6 and filter 7 is connected to the output of the device and the input of the bridge amplifier transistor control unit 8, the current transformer 9, the output winding 10 of which through the rectifier 11 and the amplifier 12 is connected to the input of the control unit 8, the additional winding 13 is connected in series with the RC chain 14, and the resulting winding is connected in parallel with the input winding The leg 5 of the transformer, the primary winding 15 of the current transformer 9 Full .mi soedine.ny terminals to the collectors of the transistors 1 and 3 adjacent arms of a bridge power amplifier, and an average output - with an input bus power. The device works as follows. When a through-current occurs in one of the arms of the bridge power amplifier, for example, through transistors 1 and 2, the signal of the overload current from the output winding 10 of the current transformer 9 through rectifier 11 enters the amplifier 12, which is compared with the allowable overload current and goes to the input of the control node 8, which issues a command to close the transistors. When the bridge amplifier transistors are turned on, for example, 1 and 4, a current equal to the sum of the load current flowing through the primary winding of the output transformer 5 and the pulse charging current of the capacitor RC 14 passes through the primary half-winding 15 of the current transformer, because the secondary winding 13 is used. 15 and an additional 13 current transformer 9 are turned on. Counter current of the RC chain 14 is subtracted and a signal proportional to the load current is induced on the output winding 10, which eliminates false signals. Wash protection node. The proposed device allows to increase the reliability of stabilizing kg of the inverter and expand the functionality of the protection node reacting to through-currents in the bridge power amplifier, and eliminate the distortion of the output signal of the overload current sensor, which allows the use of protection nodes without slowing down the integration, Formula of the invention Stabilized converter containing a bridge transistor power amplifier, in the diagonal of which is included the primary winding of the output transformer, output the winding of which is connected to the output via a rectifier and filter; a protection node, made on a current transformer, whose output winding is connected to one of the inputs of a transistor control node of a bridge power amplifier, another input connected to the converter output, and a serial RC through a rectifier and amplifier The -ue dynamic loss reduction point, characterized in that, in order to increase reliability and enhance functionality, the current transformer is provided with an additional winding connected after series with RC-chain and obrazovavscha circuit is connected in parallel with the input winding of the output transformer, a primary winding of the current transformer extreme terminals connected to the collectors of the transistors of adjacent arms of a bridge power amplifier, and an average output power with input bus. Sources of information taken into account during the examination 1. V. Moin, N. N. Laptev. Stabilized transistor converters. M., “Energie, 1972, p. 426. 2. Electronic technology in automation. Under. ed. Konev, Yu. I., “Soviet Radio, 1971, no. 2, s. 71