SU524303A1 - Device for controlling an inverter with a pulse width modulator - Google Patents

Description

(R4) DEVICE FOR THE MANAGEMENT OF THE INVERTER

with PULSE WIDTH MODULATOR

The outputs of the cells 3, 4, 5 are routed to the control units 6, 7, 8, each of which (for example 6) consists of a transformer 20, diodes I 21, 22, 23 and resisors 24, 25.

1 As phase regulators 9, 10, 11, a device was used, which includes an FPG on resistors 26, a capacitor 27, a diode 28 and a thyristor 29, whose power supply circuit (+ E. .., resistor 3O, resistor 31) is controlled by a transistor switch 32,; the transition to the base emitter of which is bridged by a resistor 33, and the nup body, made according to the 6-locking scheme of the generator on the transistor 34 and transformer 35, The pulses from the output of the transformer 35 are fed to the distributor 12 and through the resistor 36; trigger circuit 29. Diode 37 g is dump-1 fyuyushim. The FPG is synchronized by pulses from the output windings of transformer 2 supplied through diodes 3843 and resistors 44-46 to the input of transistor switches of FPG phase-shifters. The principle of operation of the circuit is based on a stepwise change in the control of the voltage-controlled flow voltage regulators 9, 10, 11 one phase synchronization control circuit of voltage regulators directly (- the corresponding control nodes 6, 7, 8), and the next one - the difference of the stable voltage U of the voltage supplied from the output of the cells of the ring splitter to the input of the control nodes, according to the magnitude of the amplitude of the liloobrazny on the yarn, and the voltage tJgjj, supplied in this case to the opposite polarity (Fig. 2d).

So in sync O -t control voltage U ,. U provides the formation of a pulse with phase amplitude, Q cycle - t voltage control control tt ,, -and and ensures the formation of a pulse with phase angle 1LOM. etc.

 The phase of the output pulses is controlled by varying the voltage within 0.-r-U0 i. Consider the control system's work. From the time the sawtooth begins to form, the voltage in the cycle O – t d I (Current; circuits through the thyristor 29 (-E2, j-resistor 26, capacitor 27, housing) charge kaer capacitor 27, of constant charge time, defined by the values 26 and 27, | is chosen in such a way as to minimize the use of the linear portion of the exponential ramp on 27 j voltage per half period of synchronization voltage (Fig. 2 ).

 In the cell 3 of the ring splitter in the considered synchronization cycle, grand source 13 is open and provides a passage through the following circuits: E2, transformer winding 15, diode 18, transistor-emitter collector-emitter 13, housing; transformer winding 20, diode 21, transistor 13 collector, housing.

The voltage UQ induced in,

the output winding of the transformer 15, in this step is applied to the cathode 23, and the current in the circuit (the beginning of the output winding of the transformer 15, diode 23, resistor 25, co4: the output winding of the transformer 15)

Missing. The voltage Ug, induced by j into the output winding of the transformer 20, is separated on the resistor 24. The voltage and y are equal to the sum of the voltages, resistivity

tori 24 and 25 this cycle is equal to the current-. value of &%. (Fig. 5) .;

Difference; voltage increasing on the capacitor 27 of the voltage U and control-j

the voltage across the voltage and / and s U through the feedback winding of the transformer 35 of the blocking generator is fed to the base-emitter transition of the transistor 34. At the moment of equality of these voltages, when their difference changes sign, the transistor 34 opens .process4 sa. The generated pulse with the phase value of OS .J (Fig. 6) is removed from the output tjo-l of the coils of the transformer 35 and fed to i

the input of the pulse distributor 12. Simultaneously with the additional winding of the transformer 35, a pulse through a resistor 36 is supplied to the thyristor-control transition; step 29, the inclusion of which causes the appearance of a recharging capacitor 27 then; k on the circuit (+ Ej, resistor 30, resistor 31J, thyristor 29, capacitor 27, housing). When | decreasing the voltage on the capacitor 27: the diode 28 is opened before the zero and it detects

reverse polarity voltage on the coil plates, equal to the voltage drop across the diode 28 (Fig. 5). Stress

 invested with the voltage Uj. l through the transformer feedback winding,

Matora 35 locks the transistor 34, providing a decelerated mode of blocking the generator.

Claims (1)

Another of the synchronization pulses, coming through diodes 38 or 39 and resistance 44 from the corresponding current of the transformer 2 and the collector transition :( the emitter of the saturated transistor of cell 5 unlocks the transistor 32, causing a higher pulse of the transistor 29. This same pulse doesn’t | When the ipOM transistor 13 is locked and the transistor 14 is open, when the thyristor is turned off 2V a, the next charge of the capacitor 27 of the E2 source is canceled. As a result of switching the cell 3; 1rois ::. Output Wires and 20, the diode 23 opens, and the voltage Uo | is applied to the resistor 25L. The voltage UY is determined by the total i: a voltage across the resistors 24 and 25 becomes Uy :: - UQ h and " that ensures the formation of the ICO pulse by the value of the phase oC j (Fig. -2d, d). i Then the process repeats similarly as | higher выш to the considered one ;; I Since the formation of the output impulses to control each of the phases of the 1 converter is performed by one using a null-yurgan phase regulator, | then the regulation error will have the same value for each of tak comrade synchronization, and hence the phase, | vy shift between the pulses with the same phase desired value is equal to 360 | e. {fig. 2, e). I Formula of the Invention j Device for controlling an inverter with a WIDE-IMPULSE modulator, WITH A holding multi-phase pulse generator consisting of a single-phase generator and a ring splitter, performed on transistor multivibrators with a transistor; the formator connection, the outputs of each of which through individually controlled phase regulators, including capacitors and output transistors, are connected to the distribution unit, which, in order to increase control accuracy, it is equipped with control nodes, each - i ryh contains a transformer, diodes and de; voltage on two resistors, I one of which is connected via a diode to | the output winding of the transformer of the corresponding: a floating multivibrator, and the other - to | the output winding of the transformer of its control unit, powered from the source; stabilized voltage through decoupling diodes and collective {emitter-9 transitions of transistors ct-corresponding to the multivibrator, and the voltage divider itself is connected to the phase-regulator capacitor through the control circuit of its output transistor.