SU813782A1 - Transistorized switch with current - Google Patents

Description

The invention relates to electrical engineering, in particular to electronic devices for converting and regulating electrical energy, and can be used as a power key in secondary sources of power systems, in an electric drive.

Known power switches containing transistors combined by power electrodes in the power circuit of each of which is included in the inductor winding [1].

The closest in technical essence to the invention is 15 transistor, a key with current feedback, containing two transistors that are connected by the same power electrodes connected to the first power output, and 20 second transistor power electrodes of the same name are connected to the second power output through primary windings of the first and second current transistors, respectively, the secondary windings of which are connected to the control input of the transistors according to the positive feedback circuit [2].

The disadvantage of this transistor switch is the lack of equalization of currents in the presence of two transistors connected by the same power electrodes of the same name connected to the power output.

The purpose of the invention is to increase the efficiency of the transistor switch.

This goal is achieved by the fact that in the transistor key, the secondary winding of the first current transformer is connected to the control input of the second transistor, and the secondary winding of the second current transformer is connected to the control input of the first transistor.

The drawing shows a schematic diagram of a transistor switch (an example of a voltage converter from constant to constant).

Transistor switch A, contains switches on parallel transistors 1, 2 and 3, 4, respectively, transformers 5 and 6 with primary windings 7, 8 and 9, 10 and secondary windings 11, 12 and 13, 14 of positive feedback output transformer 15 with load included, for example, through a rectifier.

The transistor switch operates as follows.

With the polarity of the control voltage (indicated in the drawing without brackets), transistors 1 and 2 are switched off, and transistors 3 and 4 are locked. The current flowing through the transistors 1 and 2 and the windings 7 and 9 induces a control current proportional to the current of the primary windings in the windings 11 and 13. When the current through the transistor 1 is higher than the average, the current through the transistor 2 decreases, and their control currents change inversely due to the cross-connection of the secondary windings of the current transformer with the phases of the transistors, which ensures locking of the transistor with a large current and unlocking of the transistor with a lower current. Additional alignment is provided by the currents flowing through the control and power transitions of transistors 1 and 2 under the action of differential EMF of windings 7 and 9.

The proposed transistor switch aligns the currents through the transistors while ensuring optimal saturation of the transistors and minimal power consumption from a control source.

Claims (1)

Claim A current feedback transistor switch containing two transistors that are connected by the same power electrodes of the same name connected to the first power output, and the second power transistors of the same name connected to the second power output through the primary windings of the first and second current transformers, respectively, the secondary windings of which are connected to the control input of the transistors according to the positive feedback scheme, characterized in that, in order to increase the efficiency by aligning the transistor currents, W The original winding of the first current transformer is connected to the control. mu input of the second transistor, and the secondary winding of the second current transformer is connected to the control input of the first transistor.