SU493870A1 - Adjustable transistor converter - Google Patents

Description

one

The invention relates to the field of power electrical engineering and can be used in the development of secondary power sources.

Adjustable transistor converters are known that contain a regulating transistor switch, a pulse-numbered modulator and an inverting stage with a transformer, one of the windings of which is connected to the modulator via a rectifier, and an additional transformer, the secondary windings of which are connected directly to the inputs of the transistor regulating key, and The primary circuit of this transformer has a linear current regulator.

In order to increase the reliability and simplify the circuit, one of the windings of the inverting stage of the proposed converter is connected to the primary winding of the specified additional transformer through a current limiting resistor.

The converter circuit is shown in the drawing, where 1 is an inverting cascade transformer with primary i and secondary 12 and 1z windings. 2 - inverting cascade; 3 - DC source; 4 - straightener; 5 - pulse-width modulator; 6 - adjustable source; 7 - switching transistor; 8 - straightener; 9 - additional transformer with primary 9i and secondary §2 and 9z windings; 10 11 - transistors of the control key; 12 - the main power source; 13 - current limiting resistor; 14 - filter choke; 15 - load; 16 diode; 17 - filter capacitor.

The converter works as follows.

In the steady state, on the primary winding 1 of the transformer 1 of the inverting stage 2, which is supplied from the DC source 3, non-temporal rectangular pulses are generated. These pulses from the secondary winding la of the transformer 1 through the rectifier 4 enter the supply circuit of the lattice-pulse modulator 5. At the output of the latter, rectangular pulses are generated, the duration of which varies with the voltage of the adjustable source 6.

The switching transistor 7 in the range of the unlocking signal at the input of the output of the modulator 5 is in the saturation and short-circuiting region through the rectifier 8 of the primary winding 9i of the additional transformer 9, prevents current from flowing through any of the secondary windings 92 or 9 of this transformer. At the same time, transistors 10 and 11, which form the regulating transistor switch, will be closed and the converter will not consume current from the main power source 12. In the absence of a dying signal at the input of the switching transistor 7, the latter is located in the cut-off area, the current does not flow through the rectifier diodes 8 and the secondary winding 9 of the transformer 1 of the inverting cascade passes through the limiting resistor 13 through the secondary winding 9i of the additional transformer 9. depending on the half-period, one of the secondary windings (Ez or 9z) of the additional transformer 9 also receives a current, the corresponding transistor (10 or 11) of the regulating switch is located in the saturation region and from the main power source 12 consumes energy consumed, in particular, on the energy storage device in the filter throttle 14. When changing the pulse duration of the modulator by changing the voltage of the adjustable source 6, the voltage across the load 15 of the converter will change. The diode 16 is designed to create a closed loop of the current of throttles 14 when the control switch is open. The presence of a filter condenser 17 is generally not necessary. As a source of direct current 3, in particular, power supply 12 or converter output can be used. Subject of the Invention An adjustable transistor converter containing a regulating transistor switch, a pulse-width modulator, an inverting stage with a transformer, one of the windings of which is connected via a rectifier to the modulator, and an additional transformer, the primary winding of which through a rectifier is connected to the output of the switching transistor connected through the input peep to the modulator output, and the secondary windings are connected to the inputs of the regulating transistor switch, characterized in that, in order to increase and reliability and simplification of another, the winding of the specified transformer of the inverting cascade is connected via a current limiting resistor to the primary winding of the specified additional transformer.