FR2646010A1 - HIGH VOLTAGE TRANSFORMER, ESPECIALLY FOR HOUSEHOLD APPLIANCES - Google Patents

Abstract

High voltage transformer in particular for powering a magnetron, the magnetron producing high frequency energy which is used in a household appliance for cooking, roasting or frying. A damping angle 2, made of a ferromagnetic material, is inserted between the high voltage transformer 1 and a ferromagnetic envelope 3.

Description

HIGH VOLTAGE TRANSFORMER, ESPECIALLY FOR

HOUSEHOLD APPLIANCES

  The invention relates to a high-voltage transformer intended in particular for supplying a magnetron, the magnetron producing high frequency energy which is used in a household appliance for

  cooking, roasting or frying.

  High-voltage transformers, generally consisting of a primary winding of a heating winding and a secondary winding, are used in microwave household appliances for generating a heating voltage for the magnetron cathode and for the production of the operating voltage of the magnetron. The maximum operating voltage is in this case around 4 kV. This value can be considerably exceeded for switching voltage spikes. For microwave home appliances, efforts are made to make the cooking space as efficient as possible, so that space is available for the components

  necessary electronic data is calculated as accurately as possible.

  For operational reasons, the high-voltage transformer is located near the side of the unit. This side wall of the apparatus is generally constituted by a ferro-magnetic envelope that prevents microwaves from escaping the home appliance. As a result, the operation of this microwave home appliance may be accompanied by annoying humming. This is due to the vibration of the sidewall of the apparatus caused by the alternating magnetic flux of the high voltage transformer. The solution to this problem would be to increase the distance between the high voltage transformer and the sidewall of the device, which microwave devices generally do not allow.

  for the reasons of space mentioned above.

  The object of the invention is therefore

  to prevent the purring effect by simple means.

  This result is achieved according to the invention in

  inserting a damping angle of iron material

  between the high-voltage transformer and a

ferro-magnetic envelope.

  The invention will be better understood using the

  description of an embodiment taken as an example,

  but not limiting, and illustrated by the accompanying drawing.

  The figure shows a high-voltage transformer with the damping angle in front

the ferromagnetic envelope.

  In the figure, it can be seen that a high voltage transformer 1, fixed on a bottom plate, is separated from a ferromagnetic envelope 3 by a damping angle 2 which is also fixed on the bottom plate. In such a case, the high voltage transformer 1 is advantageously arranged so that its secondary winding 5 is inserted between its primary winding 4 and the damping angle 2,

preferably in the middle.

  The purpose of the damping angle 2 is to eliminate or at least greatly reduce the humming noise due to the vibration of the side wall of the apparatus and initially generated by the flow.

  Alternating magnetic circuit of the high voltage transformer 1.

  The damping angle 2, made of ferro-

  galvanized magnetic, must be adapted to the different structural features, which depend on the type of home appliance considered each time, and granted in height, width and thickness with respect to the resonances of snoring. The arrangement of the high-voltage transformer, with regard to the position of its windings, has also proved advantageous to avoid the effects of explosion caused

  by the switching voltage spikes.

Claims (6)

  1. High-voltage transformer, particularly for the supply of a magnetron, the magnetron producing high-frequency energy which is used in an appliance by cooking, roasting or frying, characterized in that angle   damping element (2) made of ferro-   magnetic, is inserted between the high transformer   voltage (1) and a ferromagnetic envelope (3).   2. High-voltage transformer according to claim 1, characterized in that the damping angle, made of ferromagnetic material, is given in height, width and thickness to a   minimum snoring resonance.   High-voltage transformer according to Claim 1, characterized in that the damping angle (2) is mounted with the transformer   high voltage (1) on the bottom plate.   High-voltage transformer according to Claim 1, characterized in that the secondary winding (5) is inserted between the primary winding (4) and the damping angle (2). High-voltage transformer according to Claim 1, characterized in that the damping angle (2) is arranged in the middle between the   high-voltage transformer (1) and the ferro- magnetic (3).   6. High voltage transformer according to   claims 1 and 2, characterized in that the   damping angle (2), made of ferro-   magnetic, is used in galvanized version.