SU790082A1 - Phase shifting device - Google Patents

Description

The invention relates to a converter technique and can be used as a device for controlling the power amplifiers of statistical transducers.

Static transducers are known in which rectangular voltages shifted relative to each other are required to control the power unit. Usually such phase shifts are obtained with the help of master elements, delay chokes and frequency dividers l, 2.

However, delay chokes do not allow high phase shift accuracy. The RC-4ieno4Kn drivers, although they allow to obtain high phase shift accuracy, but a stable capacitor of the chain has a large weight and size and, in addition, the circuit is sensitive to various interferences, since the power of the RC chain is always minimal. Frequency dividers complicate

General scheme, with them you can get only multiples of the master frequency phase shifts.

Closest to the proposed. is a phase-shifting device containing twisted and driven magneto-transistor converters and connecting them to a phase-shifting circuit l.

The drawback of the device is the insufficient accuracy of the phase shift value. .

The purpose of the invention is to increase the accuracy of the magnitude of the phase shift. This goal is achieved in that a phase-shifting device containing a master and slave magneto-transistor converters to the phase-shifting circuits connecting them, is awaiting a waiting-blocking oscillator with a saturable transformer in a parallel circuit, each branch of which consists of a series-connected diode and antiphase output windings of the master and slave converters.

moreover, the winding of the saturating transformer through the transistor of the blocking-hexerrator, and the desaturation winding through the said parallel circuit are connected to the supply voltage source, and its secondary winding is connected to the control circuit of the slave converter.

In addition, a calibrating winding of the saturating transformer, connected through a diode to the supply voltage source, is additionally introduced into the phase-shifting device, and a resistor is connected in series with the desaturation winding.

On fng. 1 shows schematically the phase shifter ycTpoftcTBoj in FIG. 2 oscillator stresses.

The device consists of the transistors of the master 1 and the slave 2 preamplifiers of the transistor 3 of the blocking generator, the switching transistor 4 of the second preamplifier of the blocking generator. The blocking generator also contains a transformer with primary 5 and secondary 6 windings, as well as desaturation windings 7 and calibrating 8.

The parallel circuit consists of diodes forming rectifier 9, and the Vcod windings of the transformers of the master 10 and the slave 11 converters.

In addition, the device contains a rectifier 12, a transistor 13 of the second preamplifier and a limiting resistor 14.

The device works as follows.

Let, for example, transistors 1 and 2 preamplifiers be open. Then open the transistor 3 blocking generator. The voltage of the rectifier 9 is equal to zero, since in this period of time the sum of the voltages of the windings of the transformers 10 and 11 of the preamplifier connected to the rectifier 9 is equal to zero.

After saturation of the core of the blocking transformer transformer 3 is closed, a winding 6 is connected to the bases of transistors 2 and 13 of the slave preamplifier, which switches them.

At the output of the rectifier 9, a voltage appears, which, through a power source, is applied to the winding 7 of the swelling, pulling apart the core of the transformer. After changing the polarity of the output voltage of the driving preamplifier, the transistor 3 is turned on (the start of the blocking generator comes from the EMF of self-induction of the windings of its transformer) and the operation mode is repeated.

The operation of the device is illustrated by oscillograms, where the moments of opening of the transistors 1 and 2 correspond to the time interval Q b. Moment of saturation

The core of the blocking transformer transformer is point}.

The relation of times is constant

B-c and does not depend on the supply voltage.

For a block-generator transformer, the rule of equality jB with half-periods is maintained, therefore Upoicr to (b Upotcc - tbc UpoKf is the voltage on winding 5 in the operating cycle of the blocking generator, Upo, c, is the voltage of winding 7, related to winding 5 equal and rectifier 9- U rtst Voltage Ut, t, j.

(ipit 2-pit), - t- (g-P

where K-1 and Ka are the transformation ratios of the windings 5 and 7. Thus

, Vъ, Pacc.JnvdT V

- .. t-b-c Jpatf

Pete

Consequently, the magnitude of the phase shift in the proposed device does not depend on the supply voltage, frequency of the output voltage, but only on the coefficients

and K

Claims (2)

1. Phase-shifting device containing a master C driving magnetically-transistor converters and connecting their phase-shifting circuits, which is due to the fact that, in order to increase the accuracy of the phase shift well, a stand-by generator with saturating is added a transformer and a parallel circuit, each branch of which consists of a series-connected diode and an antiphase output output current, the master and slave transducers, the primary winding of the Saturated transformer through a transistor bloknng generator and desaturation winding through said parallel circuit connected to the power supply voltage, and its secondary winding coupled to the transducer for controlling the slave. 2. The device according to claim 1, that is, so that the calibration winding of the saturating transformer is additionally introduced, connected through a diode to the supply voltage source, and the resistor is connected in series with the winding. Sources of information taken into account in the examination 1. USSR author's certificate number 135954, cl. 21 d 12/03, 1965. 2..Avtorskoe certificate of the USSR № 349098, cl. H 03 K 7/04, 197O. eight - Uifnb  t  t