SU544123A1 - Magnetic Transistor Pulse Width Modulator - Google Patents

Description

The main windings of the first and second magneto-transistor amplifiers, respectively, the control windings of the first and second magneto-transistor amplifiers are connected in series, and the switching transistors are connected in series and connected to the power buses through the load.

The drawing shows a circuit diagram of a magneto-transistor pulse-width modulator.

The magnetically-transistor pulse-width modulator contains the first and second magnetic-transistor amplifiers 1 and 2, consisting of switching transistors 3, 4 and magnetic amplifiers 5 and 6, having 5 working windings 7-10 and basic windings 11- 14, connected in series with the switching transistors 3 and 4 with o are responsible o.

The first and second magnetically-transistor 2 amplifiers 1, 2 have input transformers 15 and 16, respectively, the primary windings 17 and 18 of which are connected to alternating voltage generators 19 and 20 of rectangular form of an inputted phase-shifted device 25, the inputs of which are connected with the secondary windings 21-24 of the input transformer 25, and the outputs are connected to the primary windings Ai 17 and 18 of transformers 15 and 16, zo The secondary windings 26 and 27 are connected in series with the working windings 7-10 and the base windings 11-14 of magnetic preamplifier 5 and 6.

The control windings 28-31 of magneto-transistor amplifiers 1 and 2 are connected in series.

Switching transistors 3 and 4 are connected in series and, through load 32, are connected to power lines 33 and 34.40.

Magnetic transistor pulse-width modulator operates as follows.

The square-shaped voltage from the windings 21-24 of the input transformer 25 is supplied to the inputs of alternating-voltage generators 19 and 2O of rectangular form (triggers) with a transformer output. Each of the generators 19 and 20 (triggers) operates in the frequency division mode by two, so their output voltages are 50 ° out of phase relative to each other.

The primary winding 17 of the transformer 15 is supplied with alternating voltage of rectangular shape from generator 19. Working voltage for core 35 (controlling for core 36) the half-period voltage removed from winding 26 of transformer 15 unlocks diodes 37 and 38. Core 35 begins to magnetize, the inductive resistance of the base winding 11 is large, and transistor 3 opens. A working winding 7 begins to flow a current, an emf directed towards it is output in the winding 11, as a result of which the diode 37 is blocked and the base current is determined by the voltage supplied from the winding 26 and the resistance of the resistor 39.

At the moment of saturation of the core 35, the winding current 7 sharply increases, the rate of change of induction decreases. The transistor 3 begins to lock, its collector current decreases, the current in the winding 7 decreases. The electromotive force in the winding 11 changes sign, is summed up with the voltage of the winding 26 and causes forced locking of the transistor 3. Until the end of the sub-period, the core 35 remains saturated, while winding 11 is small, and transistor 3 is locked.

The next half period for the core

35 is control, and for core 36 a worker. Until the core is saturated

The 36 electromotive force in the winding 11 balances the voltage of the winding 26, and the diode 37 in the winding 11 balances the voltage of the winding 26, and the diode 37 is locked. After saturation of the core 36, the EMF in the winding 11 becomes zero to zero, and the diode 37 remains closed.

Thus, the base circuits of the core 35 in the half-cycle controlling for it does not affect the operation of the transistor 3.

Similarly, the magneto-transistor amplifier 2 operates, but with a phase shift of

90 °

The modulator starts running

Claims (1)

40 rectangular pulses per winding. Invention Formula A magnet-transistor pulse-width modulator comprising a first and second magnet-transistor connectors consisting of a switching transistor and a magnetic amplifier having working and base windings connected in series with the switching transistor, control windings and an input transformer, the primary winding of which is connected with a rectangular alternating voltage generator, characterized in that, in order to increase the conversion coefficient and obtain the full conversion range, cb Deno forming apparatus phase-shifted voltages, whose inputs are connected to the secondary windings of the input transformer, and the outputs are connected to the primary winding