JPH0250408A - Circuit structure - Google Patents

Abstract

PURPOSE: To improve the operation performance of a transformer by winding one of two winding wires reverse to the other wire winding and at least some windings of the one wire are formed round a separate core from the other winding core. CONSTITUTION: Prim. and sec. windings 14, 15 are formed round a core. The prim. winding 14 is connected to a d-c charging circuit 16. The sec. winding is composed of two wires 17, 18 mutually neighbored and wound mutually reverse. At least some of the one wire windings are separate from the others to thereby generate a magnetic field in the core material, without causing the surface effect by the two-wire windings. The generated magnetic fields have the same intensity but mutually reverse directions, resulting in a perfect mutual cancellation. This improves the operation performance of a transformer.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a circuit structure, and more particularly, to a circuit structure that uses a current flowing through a primary winding to connect a circuit structure such as a magnetron that is connected across a secondary winding. The present invention relates to a circuit configuration including a transformer that drives a load, but is not limited thereto.

BACKGROUND OF THE INVENTION A circuit arrangement previously used to drive a magnetron is shown in FIG. This circuit structure is
It comprises a pulse transformer l having a core 2 around which a primary winding 3 and a secondary winding 4 are wound. The primary winding 3 is connected to a DC charging circuit, indicated generally by the reference numeral 5, which circuit comprises a switch 6 for controlling the passage of pulsed current to the primary winding 3. The secondary winding 4 is
It is double-wound, ie, consists of two wires wound parallel to each other such that adjacent turns carry current in opposite directions. The secondary winding 4 is connected to the power supply of the heater element 7 of the magnetron. The proximity of the two wires creates only surface effects within the core 2, and the magnetic fields generated by the heater current flowing through the secondary winding 4 tend to cancel each other out. The magnetron cathode is connected to one terminal 8 of the heater element and the other terminal is indicated at 9.

B of core 2 showing magnetic flux density B as a function of magnetic field strength H
The -8 curve is shown in FIG. The smaller curve YY" is the hysteresis loop with small magnetizing force, and the other loop ZZ1 is the maximum loop where saturation occurs if Hl is exceeded. 6 Curves OXY and OxZ are each It shows the curve taken for the first half of the cycle for the loop.The part of the hysteresis loop where the operation occurs is due to biasing the core 2.

Curves WW" and VV" are selected by using positive and negative biases, respectively. When a pulse is passed through the primary winding 3, the core of the transformer is magnetized. After the pulsed current is transmitted, and thus the magnetic field is removed, a residual R remains and decays over time based on the material of the core, the conditions present in the core, and other external conditions. Resetting the transformer core between pulses
It is desirable to be able to use a wide range of regions of the B-8 curve, thereby maximizing the power that can be handled by a given core volume. By providing a relatively large change in B as B decreases, the capacity of the core to pass large width pulses is increased.

In order to reset the transformer core 2, a further auxiliary winding 10 connected to the power supply 11 is adjusted.

After the pulse passes through the primary winding 3 and produces magnetization, the pulse is transmitted via the auxiliary winding lO. This applies a magnetic field that counteracts the effect caused by the pulses through the primary winding 3 and resets the transformer core.

SUMMARY OF THE INVENTION The present invention provides an improved circuit arrangement including a transformer core.

According to a first feature of the invention, the invention comprises a transformer having a substantially toroidal core and a winding disposed around the core, said winding consisting of two wires. , one of the wires is wound in the opposite direction to the other, and at least some of the turns of one wire are wound on a different core portion than those of the other. .

The core typically has a circular cross section, but this need not be the case. By using such a winding, a large variation in the B magnetic field can be obtained, thereby improving the operational performance of the transformer. This is because at least some of the turns of one wire are spaced apart from the other so that each wire creates a magnetic field within the core material rather than the surface effect caused by a traditional two-turn winding. The magnetic fields generated are of the same magnitude and opposite in direction and therefore completely cancel each other out.

The dipole element of the core material is acted upon by magnetic fields whose resultant force is zero, but which enhances the mobility of the dipole element when it is in dynamic equilibrium. Microscopic variations in the strength, size and orientation of the dipole produce a rapid response when changing the applied magnetic field. This allows the core to pass pulses of greater width than would be possible using conventional configurations.

The windings are arranged so that only a portion of each wire is spaced apart from each other, but preferably each wire is wound on a separate portion without creating an overlap. Although separated from each other, in a particularly advantageous embodiment the windings are secondary windings connected to the load.

According to a second feature of the invention, a transformer is provided, the transformer resetting the transformer core after the current has been transferred to the secondary winding to which the load is connected and to its primary winding. and means for passing current through the secondary winding. The term "reset" means that the magnetic flux density is reduced than it would otherwise be, and does not necessarily mean only that negative saturation or remanence is obtained. By configuring it to use a secondary winding, is there any additional need for traditional configurations? It source,
The invention, in which auxiliary windings and other circuit elements are not required, is particularly applicable to arrangements where the load is a magnetron and the current used to reset the core is also the magnetron's heater current. , is achieved by using a secondary winding consisting of two windings placed next to each other and wound in opposite directions.

One way of implementing the invention will now be described by way of example with reference to FIG.

Embodiment Referring to FIG. 3, a circuit arrangement according to the invention comprises a transformer 12 having a core 13 around which a primary winding 14 and a secondary winding 15 are wound. Primary winding 1
4 is connected to a DC charging circuit 16 similar to that shown in the circuit arrangement of FIG. The secondary winding 17 is connected to a load, which in this example is a magnetron. This secondary winding consists of two wires 18 and 19, which are placed next to each other and are sprung in opposite directions.

The secondary winding 17 has four terminals 20, 21, 22 and 23
Contains. The heater element of the magnetron is connected across two terminals 21 and 22 arranged between the two parts 18 and 19 of the secondary winding 17. The terminal 21 is
It is also connected to the magnetron's cathode. The terminal 20 is
is the input terminal of the heater power supply to which the heater current is sent, and terminal 23 is connected to ground;

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a conventional circuit arrangement for driving a magnetron; Fig. 2 is a graph of the B-8 curve of core 2 showing magnetic flux density as a function of magnetic field strength; and Fig. 3 FIG. 1 is a circuit diagram showing a circuit arrangement according to the present invention. 12...Transformer 13...Core 14...Primary winding 15...Secondary winding 16...Charging circuit 1
7...Secondary winding 18.19...Wire 20.21.22.23...I terminal

Claims (7)

[Claims] (1) A transformer having a substantially toroidal core and a winding around the core, the winding consisting of two wires, one of which is oriented in the opposite direction to the other. 1. A circuit arrangement characterized in that the wire is wound and at least some of the turns of one wire are wound on a separate core portion from the other. 2. The circuit arrangement of claim 1, wherein one wire is wound on one portion of the core and the other wire is wound on another portion of the core. (3) Claim 1 comprising means for passing a direct current through the winding.
Or the circuit structure according to 2. (4) The structure according to claim 1, 2 or 3, wherein the winding is a secondary winding to which a load is connected. (5) a transformer comprising: a secondary winding to which a load is connected; 1. A circuit structure comprising: means for passing an electric current. (6) The circuit structure according to claim 5, wherein the secondary winding comprises two windings arranged adjacent to each other and wound in opposite directions. (7) The circuit structure according to claim 4, 5 or 6, wherein the load is a magnetron, and the current flowing through the secondary winding is a heater current of the magnetron.