DE1638466C - Power supply device for single-phase electrical loads from a three-phase network - Google Patents

Description

3. Power supply device according to claim 1, however, the known devices have a or 2. characterized in that the inductive series of disadvantages. The output current is un-coupling / wipe the in series with the primary 25 stable, dependent on mains voltage fluctuations winding (1) of the net / transformer (2) and cannot be regulated continuously.

th Vordrosfil (3) and the lagging phase. Furthermore, the known devices for

lowing throttle (4) is designed as positive feedback. Keeping only one given constant

4. Stronv.ersorgungseinnc.tung determined according to claim 1 output currents.

or 2, characterized in that the inductive 30 The invention is based on the object by Coupling between the in Rv.he with the primary upstream connection of an additional element a current WKÜung (1) of the network transformer (2) to create switched supply device, the output of which Choke (3) and the current in the lag phase are independent of mains voltage fluctuations lowing throttle (4) is designed as a negative feedback and contiist according to a program to be specified. 35 can be controlled naturally.

5. Power supply device according to claim 1 This object is achieved with an itromversorgungsein- or?., Characterized in that the inductive direction of the type mentioned according to the invention between the coupling in series with the primary is achieved in that winding in series with the primary winding (1 ) of the mains transformer (2) ge of the mains transformer at least one choke connected choke (3) and which is connected in the lagging phase, which is inductively coupled to the choke (4) in the lagging phase in the form of a rotary throttle adjustable inductively is.
variometer is designed that both the coordination of the inductive coupling takes place counter-coupling and a positive coupling of the throttles by a control unit, which enables a signal to the control (3, 4) without their switching. of the coupling factor is generated as soon as the equation

6. Power supply device according to claim 1 <5 weight between the actual value and the one preferred or 2, characterized in that corresponding solider in series with lowing output current program Primary winding (1) of the network transformer (2) value of the voltage is disturbed.

two chokes (7, 8) are connected, of which the inductive coupling of the series with the primary

the one connected to the winding of the mains transformer that is in the lag phase

the throttle (4) as negative feedback and the other 50 pre-throttle with the throttle that is in the lag phase

is designed as positive feedback. can be as positive feedback or negative feedback

7. Power supply device according to claim 6, be performed.

di.durch characterized in that the series with the The inductive coupling between the choke

Primary winding (1) of the network transformer (2) and the throttle lying in the lag phase 'can

connected chokes (7, 8) as two opposing 55 but also with the help of a rotary variometer,

other connected coils are executed, the both a counter and a positive feedback of the

With regard to a minimum mutual inductance, one allows choking without switching it over,

appropriate distance and both in series with the primary winding of the NUztransfor-

Mutually and in relation to the lagging mators, two chokes can also be connected,

phase-lying throttle (4) are arranged coaxially 60 of which one opposite the one in the lag phase

and along the common axis (9) adjustable throttle one negative coupling and the other

are. "has positive feedback.

When the two chokes are connected in series

this expediently as two opposing

65 switched coils executed with a view to a minimum mutual inductance a corresponding

The invention relates to a Stromversor- spaced and both mutually and in

iuinsseinrichtung for single-phase electrical consumption in relation to the choke which is in the healing phase

1 658466

are arranged coaxially and along the common Axis can be adjusted.

The subject matter of the invention is explained in more detail by means of exemplary embodiments with reference to the drawings. It shows

F i g. 1 is the electrical circuit diagram of the power supply snit a choke,

F i g. 2 the electrical circuit diagram of the power supply with two chokes,

F i g. 3 the structural arrangement of the in F i g. 2 listed chokes in section,

F i g. 4 the electrical circuit diagram of the power supply with regulated stabilization,

F i g. 5 is the electrical circuit diagram of the power supply with a surge protector.

The power supply device for single-phase electrical loads is a star connection of the Primary winding 1 (Fig. 1) of the with a throttle 3 in Row lying mains transformer 2, the choke 4 and the capacitor 5. The choke 4 is in the Lag phase and is inductively coupled to the choke 3, while the capacitor is in the lead phase and has the same reactance as the choke 4.

The equality of the reactance values of choke 4 and capacitor contributes to the fact that the current in the primary winding 1 (and thus in the secondary winding 6) of the mains transformer 2 as a result of resonance phenomena in the area caused by the choke 4 and the series circuit formed by the capacitor 5, regardless of the load resistance of the mains transformer 2 isi. The current in the primary winding 1 of the transformer 2 results as follows:

Herein means

I ₁ Jen current in the primary winding 1 of the network transformer 2;

U _{1 is} the voltage of the supply network;

X the reactance of the choke 4 or the equivalent reactance of the capacitor 5;

X _{3 is} the reactance of the choke 3;

K is the coupling factor of chokes 3 and 4.

The sign »+« corresponds to negative feedback from chokes 3 and 4, the sign »-« to positive feedback the same.

If the coupling factor K of the chokes 3 and 4 changes continuously, the current in the primary winding 1 (and also in the secondary winding 6) of the network transformer 2 also changes continuously.

The continuous change of the coupling factor can, for example, by changing the mutual Position of the throttles 3 and 4 can be achieved.

The throttles 3 and 4 can be coupled both in reverse and positive direction.

With an unchangeable control range of the current in the primary winding 1 of the mains transformer 2 the positive feedback of the chokes 3 and 4 results in a larger inductance value for the diossel 4 and one lower capacitance value for the capacitor than with negative feedback. This also results in a lower one Inductance value for the choke 3.

Most useful is such a design of the throttles 3 and 4 that both the counter and the Positive feedback can be achieved, for example, the execution of the throttles 3 and 4 as a rotary variometer.

ίο In this case determines the inductance of the throttle I3 the minimum possible value.

The common use of negative and positive feedback is realized in an arrangement at the one in series with the primary winding 1 (FIG. 2) of the network transformer 2 two with the one in the lag phase lying choke 4 inductively coupled chokes 7 and 8 are connected, where one counter and one the other has positive feedback with respect to the throttle 4.

ao The throttles 7 and 8 (F i g. 3) can be in the form of two coils be executed, both mutually as

are also arranged coaxially with respect to the throttle 4

and are adjustable along the common axis 9.

When the throttle 7 is led out of the throttle 4

J5 only throttle 8 remains inductively coupled with throttle 4, while conversely when leading out the throttle 8 from the throttle 4 only the throttle 7 with the Choke 4 remains inductively coupled. While the throttles 7 and 8 compared to the throttle 4 continuously

borrowed from one end position to the other, there is a continuous transition from counter to positive feedback or vice versa. The total inductance the chokes 7 and 8 (F i g. 2, 3) is half as large as the inductance of the choke 3 (F i g. 1), while the inductance of the choke 4 and the capacitance of the Capacitor 5 have the same values as in the first embodiment, where the reactors 3 and 4 as Rotary variometers are designed.

Because the current in the primary winding 1 of the mains transformer 2 (F i g. 1) the line voltage is directly proportional to ir, t, call line voltage fluctuations proportional current changes in the primary winding 1 (and thus also in the secondary winding 6) of the Mains transformer 2 emerges. The stabilization of the

* 5 load current occurs in the event of fluctuations in the mains voltage by changing the coupling factor of the throttles 3 and 4 as a result of mutual adjustment by means of a? Drive (not shown in the drawings) from a control unit 10 (Fig. 4) a signa! receives.

The control unit 10 consists of a control path that the actual value 11 with the setpoint 12 of the Compares the mains voltage and generates a signal that is dependent on the difference between these voltages.

By changing the setpoint signal that the control unit 10 is supplied, any values of the load current can be set.

When the transformer load is switched off, the device switches to no-load operation, which is characterized by a sudden increase in voltage across the capacitor fi (FIG. 1). To prevent. A device can be used for overvoltages in which the choke A < (FIG. 5), which is in the lag phase, contains an additional winding 13 which is placed in parallel with the capacitor 5 via a control unit 14. The control unit 14 responds when the nominal voltage on the capacitor 5 is exceeded.

be 4 and the capacitor 5 is brought out of resonance and the overvoltage on the capacitor 5 is eliminated.

The advantage of the invention lies in the lowering of the operating costs of power supply devices for vacuum arc furnace and electrical systems

to double and in the security of the highest possible Stability of the working current.

In comparison to all known systems, the device according to the invention also has the advantage of having a leading power factor.

1 sheet of drawings

Claims (2)

I 638 466 rather from a Ürebsttönmetz, consisting of the patent claims: Star connection of the primary winding of a single-phase: network transformer, one in the lag phase 1. Power supply device for single-phase the choke and one in the leading phase, electrical consumers from a three-phase network, 5 having the same reactance as the throttle from the star connection of the primary winding capacitor. Such facilities are development of a single-phase power transformer, one required for systems that have a stable output input the lag phase lying throttle and a current erin when the consumer resistance changes the leading phase lying, the same blind demands, such as z. B. vacuum arc furnace, electron resistance such as the condenser-type condenser melting systems, electrolysis systems and lighters, characterized in that in arc welding systems Series with the primary winding (1) of the Netztrans- facilities of this type are known (A. D. formators (2) at least one choke (3) from Svencanskij and K. D. Guttermann, is switched, dre with the lagging phase- [Avtomaticeskce regulirovanie elektriceskich pecej « the throttle (4) is adjustable inductively coupled. 15 »Automatic regulation of electric ovens], publisher 2. Power supply device according to spoke 1, "Energija", Moscow, Leningrad, 1965, 'S. 442 to 451; geLcnn / eidii et through a control unit (10) to and Λ. N. M 11J a c h, B. E. K u b y A k i η and Control of inductive coupling depending on I. V. V ο I k ο v, »Induktivno-emkostnye preobrazovakeit of the difference / between the one teli istofnikov naprjazenija ν istoiniki toka «[inductive to be given Output current program corresponding to capacitive converters from voltage sources to currents Setpoint (12) and the actual value (11) of the inputs], publishing house “Naukova dumka”, Kiev. l% 4, output voltage. Pp. 70 to 73).