RU2418333C1 - Resonance transformer - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: resonance transformer includes magnetic conductor (1), primary winding (2), secondary winding (3) and capacitor (4). Magnetic conductor (1) has elongated rods and yokes. Secondary winding (3) is located at symmetrical distance from magnetic conductor (1) and located together with primary (2) winding around one rod. Primary circuit of transformer is introduced to resonance mode of currents by parallel connection of capacitor (4) and primary winding (2).

EFFECT: reducing impact of secondary winding on primary one.

4 dwg

Description

The invention relates to the field of electrical engineering and is intended, in particular, to convert one AC system to another in the absence of the secondary winding on the primary.

The applicant knows the closest prototype of the claimed invention as the closest to him in the aggregate of essential features. This prototype is a power transformer containing a magnetic circuit made of electrical steel, the primary and secondary windings located on the rods, the primary winding connected to an AC voltage source, and the secondary winding to the load (Katsman M.M. Electric machines. - M. : High School, 1983, p.13).

The disadvantage of this transformer is the effect of the secondary winding on the transformer magnetic circuit through its magnetic field and, as a consequence, the impact on the physical processes occurring in the primary winding circuit, which affects the operation mode of the power source depending on the load in the secondary circuit of the transformer.

The problem to which the invention is directed, is to eliminate the effects of the secondary winding on the transformer magnetic circuit by means of its magnetic field.

The mentioned task is achieved in that the resonant transformer contains a magnetic circuit 1, a primary winding 2, a secondary winding 3 and a capacitor 4, the magnetic circuit 1 has elongated rods and yokes, and the secondary winding 3 is symmetrically removed from the magnetic circuit 1 and together with the primary 2 is located around one rod, moreover, the primary circuit of the transformer is introduced into the resonance mode of the currents by parallel connection of the capacitor 4 and the primary winding 2.

The technical result of the invention is the absence of the effect of the secondary circuit of the transformer on its primary circuit through the magnetic field of the secondary winding.

Obtaining the technical result of the invention is possible only by symmetrically removing the secondary winding of the transformer from its magnetic circuit and increasing the magnetizing force of the primary winding using increased reactive power in the current resonance mode obtained by parallel connection of the primary winding of the transformer and capacitor.

Figure 1 shows the construction of a resonant transformer in section;

figure 2 presents a schematic electrical diagram of the connections of the primary and secondary circuits of a resonant transformer;

figure 3 presents a vector diagram explaining the course of physical processes of the primary circuit of a resonant transformer;

figure 4 presents a vector diagram explaining the operation of the resonant transformer.

The resonant transformer shown in Fig. 1 contains a magnetic circuit 1, a primary winding 2 and a secondary winding 3, the magnetic circuit 1 has elongated rods and yokes, and the secondary winding is symmetrically removed from the magnetic circuit and together with the primary one is located around one rod.

Schematic diagram of the connections of the primary and secondary circuits of the resonant transformer, shown in figure 2, contains a capacitor 4, a resonant transformer 5, a load of 6 and works as follows. The secondary winding of the resonant transformer 5 (figure 2) is symmetrically removed from the magnetic circuit to such a distance that when the rated load current of the EMF of the primary winding flows through it, it is zero. The secondary winding must be removed at least by the magnitude of the magnetic induction in the center of it according to the formula:

D ₂ = µ · l ₂ · N ₂ · f / ℓ,

where D is the diameter of the frame of the secondary winding (m);

µ is the magnetic permeability (GN / m);

I ₂ - current strength in the secondary circuit (A);

N ₂ - the number of turns of the secondary winding;

f- secondary current frequency (Hz);

ℓ is the length of the magnetic line (m).

Due to the absence of the effect of the remote secondary winding on the magnetic circuit of the resonant transformer, the primary winding of the latter becomes an inductance coil with a core and is one element of the oscillating circuit, the second element of which is a capacitor 4. The reactance of the inductive nature of the primary winding of the resonant transformer is equal to the reactance of the capacitive nature of the capacitor 4 at a constant frequency input voltage U ₁ . Thus, the primary circuit of the resonant transformer is in the resonance mode of the currents. Due to the effect of increasing reactive power in resonance mode, the energy of the magnetic field of the primary winding increases to the value necessary to induce the desired EMF in the secondary winding to supply load 6. As a result, the resonant transformer operates normally, supplying load 6, while the physical processes occurring in the primary circuit windings are independent of the physical processes occurring in the secondary winding circuit.

As can be seen from the vector diagram (figure 3), the current strength of the capacitor I _c is many times higher than the current strength of the power source I and equal to the current strength of the primary winding of the resonant transformer I ₁ .

As can be seen from the vector diagram of the resonant transformer (figure 4), the current of the primary winding I ₁ does not depend on the load current 1 _n and the primary winding is inductive, despite the active nature of the load 6, where:

Ф - magnetic flux of a resonant transformer (Wb);

I ₁ - current strength of the primary winding of a resonant transformer (A);

E ₁ - EMF of the primary winding (B);

E ₂ - EMF of the secondary winding (B);

U _n - voltage at the load (V);

I _n - current in the load circuit (A);

I _2X2 - voltage drop across the inductive resistance of the secondary winding (V);

I _2r2 - voltage drop across the active resistance of the secondary winding (V);

I _2z2 - voltage drop at the impedance of the secondary winding (V);

I _1X1 - voltage drop at the total resistance of the primary winding (V);

I _1r1 - voltage drop across the active resistance of the primary winding (V);

I _1Z1 - voltage drop at the total resistance of the primary winding (V);

U ₁ is the voltage of the primary winding (V).

Claims (1)

A resonant transformer containing a magnetic circuit (1), a primary winding (2), a secondary winding (3) and a capacitor (4), characterized in that the magnetic circuit (1) has elongated rods and yokes, and the secondary winding (3) is symmetrically removed from the magnetic circuit (1) and together with the primary (2) is located around one rod, and the primary circuit of the transformer is introduced into the resonance mode of the currents by parallel connection of the capacitor (4) and the primary winding (2).

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