Transformer

Abstract

The invention discloses a transformer, which comprises a hollow insulation framework, a primary winding, a secondary winding, a first magnetic core and a second magnetic core, wherein the primary winding and the secondary winding are wound on the outer surface of the insulation framework in a spacing manner; the first magnetic core and the second magnetic core are respectively inserted into the insulation framework from both ends of the insulation framework so as to form a magnetic loop; the first magnetic core and the second magnetic core are spaced by facing mutual surfaces so as to define an air gap, wherein the number of turns of the secondary winding is N (turn), the size of the air gap is D (mm), and the ratio N / D of N to D meets the following relational expression: N / D is less than 100:1. According to the transformer disclosed by the embodiment of the invention, hard switching of a magnetron driving power supply running at a low-power stage can be greatly reduced, the loss of a switching element can be reduced, temperature rise is reduced, and the efficiency is improved.

Description

technical field [0001] The invention relates to the field of current and voltage transformation, in particular to a transformer. Background technique [0002] A high-frequency heating device such as a step-up transformer used in a magnetron drive power supply is mainly composed of a bobbin, a primary winding and a secondary winding wound on the bobbin, and two U-shaped magnetic cores or a U-shaped core inserted into the bobbin to form a magnetic circuit. The magnetic field is composed of an I-shaped magnetic core, and an air gap is provided on the opposite surface of two U-shaped or a U-shaped and an I-shaped magnetic core. [0003] The structural setting of the step-up transformer in the related art makes the magnetron driving power supply run in a high-power (for example, power above 800W) section, and can work normally, but once the magnetron driving power supply operates in a low-power (for example, below 500W power) section , there will be a large hard switch, the loss...

AI Technical Summary

Problems solved by technology

[0003] The structural setting of the step-up transformer in the related art makes the magnetron driving power supply run in a high-power (for example, power above 800W) section, and can work normally, but once the magnetron driving power supply operates in a low-power (for example, below 500W power) section , there will be a large hard switch, the loss of the switching device will increase greatly, and the temperature will rise sharply, which will affect the stable and reliable operation of the magnetron drive power supply and reduce the efficiency

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