SU1483668A1 - Diode-staged line scanning transformer - Google Patents

Abstract

The invention relates to television technology. The purpose of the invention is to reduce the size of the transformer by reducing the width of the layer of the sections of the high-voltage winding and reducing the cross-section of the core. The transformer contains a core 1 of ferromagnetic material, a primary winding 2, a high voltage winding 3 divided into sections, and also high voltage diodes 10, 11, 12. To achieve the goal, the high voltage winding sections 3 are made in the form of pairs of multilayer coils. The first section contains a pair of multilayer coils 4 and 5, and the second section contains a pair of multilayer coils 6 and 7, each of which consists of layers of wire 8 separated by interlayer insulation 9 of a dielectric film. Each pair of windings in a section is connected by initial leads, and the direction of their winding is opposite. 3 il.

Description

1

The invention relates to television technology and can be used in line output stages of information display devices.

The purpose of the invention is to reduce the size of the transformer by reducing the width of the layer of the sections of the high-voltage winding and reducing the cross-section of the core.

FIG. Figure 1 shows a sketch of the diode-cascade line transformer design (TDX); figure 2 - its equivalent circuit; FIG. 3 shows timing diagrams explaining the operation of the TDX.

TDX contains (figure 1) core

I of the ferromagnetic material, the primary winding 2, the high voltage winding 3, divided into sections, the first of which contains a pair of multilayer coils 4 and 5, and the second contains a pair of multilayer coils 6

and 7, each of which consists of layers of wire 8, separated by interlayer insulation 9 from a dielectric film, as well as the first 10, second

II and the third 12 high-voltage diodes. TDKS works as follows. Primary winding 2 TDKS (figure 2)

creates a magnetic flux, inducing in the windings 4, 5, 6 and 7 voltage pulses with a period of 64 µs and a return duration of about 12 µs. The forward voltage is 15–20% of the return voltage. In addition to the sections of the high-voltage winding 3 and high-voltage diodes 10, 11, and 12, parasitic capacitances, indicated in FIG. 2 as CS, CN and SC, with CS being the own capacitances of parts of the high-voltage winding, CN being the capacitance between the first layer and the core, and SC being the capacitance between the last layer and the core. Each pair of windings in the high voltage winding section is connected by initial leads, and their winding direction is opposite, whereby the voltage pulses of both windings of each section are summed.

FIG. 3 shows the voltage plots at the terminals of the high-voltage winding 3: 13 — the left terminal (FIG. 2) of the first winding 4 of the first section, 14 — its right terminal, 15 — the right one

0

five

0

five

0

five

0

five

0

five

the output of the second winding 5 of the first section, 16-18, is similar for the first 6 and second 7 windings of the second section, and 19 is the output voltage TDX.

During the maximum return voltage, the high-voltage diodes 10, 11, and 12 are open, and the capacitors SC, CN, and the load capacitance Сn are charged through them. As soon as the return voltage begins to decrease, high-voltage diodes 10, 11, and 12 lock up and redistribute the charge of the CN and SC capacitors, as CN SC, and the SC capacitor is shielded by the CS capacitance.

Since the capacitances CN and SC in the presence of diodes do not affect the equivalent capacitance of the high voltage winding, its equivalent capacitance C $ is determined only by the sum of capacitances CS. This makes it possible to tune the TCSS to a higher harmonic of the horizontal retrace frequency, i.e. solve the same tasks as in the prototype with smaller dimensions TDKS.

In addition, the proposed TDX design allows reducing the electric field strength in the terminal area and, consequently, increasing the electrical strength of the TDX.

Claims (1)

Invention Formula A diode-cascade flyback transformer containing a core of ferromagnetic material, a primary winding located on it, located on top of it a high-voltage winding divided into sections, as well as high-voltage diodes connected in series with the leads of the high-voltage winding sections, characterized in that, in order to reduce overall dimensions transformer by reducing the width of the layer sections of the high voltage winding and reducing the cross section of the core, the high voltage winding sections are made in the form ares multilayer coils connected in tandem initial findings, the winding direction of the coils in a pair of mutually opposite, and high voltage diodes are connected to the end terminals sec- Nij. s / 4 GGL 5 f2 °° l CTTY-PGP7 "te FIG. 2 17 1B 4LSH / 3 / / Fig.Z