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Method for improving insulation and voltage resistance of transformer through parylene vapor deposition

A vapor deposition, insulation and withstand voltage technology, applied in transformer/inductor housing, inductance/transformer/magnet manufacturing, transformer/inductor coil/winding/connection, etc., can solve circuit failure, breakdown of transformer and casing, etc. Problems, achieve the effect of improving electrical performance, improving insulation withstand voltage performance, and improving reliability

Pending Publication Date: 2022-04-29
XIAN MICROELECTRONICS TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the present invention provides a method for improving the insulation withstand voltage of a transformer through parylene vapor deposition, which solves the breakdown between the transformer primary and secondary and the discharge between the transformer and the shell when the hybrid integrated circuit is used. and other problems that lead to circuit failure

Method used

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  • Method for improving insulation and voltage resistance of transformer through parylene vapor deposition
  • Method for improving insulation and voltage resistance of transformer through parylene vapor deposition
  • Method for improving insulation and voltage resistance of transformer through parylene vapor deposition

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Effect test

Embodiment 1

[0046] The transformer is a structure with a magnetic tank and a skeleton, using enameled wire with a diameter of Φ0.08mm, and winding it on the skeleton according to the turn ratio required by the circuit; the insulation withstand voltage requirement of the transformer is that the leakage current between the primary and secondary under AC 2500V does not exceed 0.050mA, and the leakage current does not exceed 1mA at DC 3500V; the circuit needs to be assessed at a high temperature of 150°C during screening. Parylene vapor deposition equipment such as image 3 As shown, it includes a sublimation furnace 7 ; a cracking furnace 8 ; a deposition chamber 9 ; a cold trap 10 ; and a vacuum pump 11 . The specific process steps are: Parylene is heated and gasified in the sublimation furnace 7, and then cracked into free gas phase molecules by the cracking furnace 8 at a high temperature, enters the deposition chamber 9, and passes through the action of the vacuum pump 11 and the cold tr...

Embodiment 2

[0055] The transformer is a structure with a magnetic tank and a skeleton, using enameled wire with a wire diameter of Φ0.08mm, and winding it on the skeleton according to the required turn ratio of the circuit; the insulation withstand voltage requirement of the transformer is that the leakage current between the primary and secondary under AC 1500V should not exceed 1mA, and the leakage current does not exceed 1mA at DC2000V; the temperature of the circuit does not exceed 125°C during screening and assessment and subsequent service.

[0056] (1) The winding is firstly pretreated, that is, the plasma cleaning equipment is used to bombard the surface of the winding with Ar plasma to improve the surface activity of the winding, which helps to strengthen the adhesion of the film layer on the surface of the winding.

[0057] (2) The windings after the pretreatment are placed in the Parylene vapor deposition equipment for film layer preparation, and the batch windings are processed...

Embodiment 3

[0064] The transformer is a magnetic core plus enameled wire winding structure, using enameled wire with a wire diameter of Φ0.15mm, which is wound on the magnetic core according to the required turn ratio of the circuit; the insulation withstand voltage requirement of the transformer is the leakage current between the primary and secondary at AC 2000V No more than 1mA, and the leakage current does not exceed 1mA at DC 2800V; the temperature of the circuit is 150°C during screening and assessment and subsequent service.

[0065] (1) The magnetic core is firstly pretreated, that is, the surface activity of the magnetic core is improved by using the plasma cleaning equipment to bombard the surface of the magnetic core, which helps to strengthen the adhesion of the film layer on the surface of the magnetic core.

[0066] (2) After the pretreatment, the magnetic cores are placed in the Parylene vapor deposition equipment for film layer preparation, and the batch magnetic cores are ...

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Abstract

The invention provides a method for improving insulation and voltage resistance of a transformer through parylene vapor deposition, which comprises the following steps: when a transformer with a magnetic tank and skeleton structure is adopted, winding a first enameled wire on a skeleton to obtain a winding, and performing parylene vapor deposition on the surface of the pretreated winding to obtain a winding with a parylene film layer; assembling the winding with the parylene film layer after vapor deposition and a magnetic tank to obtain a transformer, and performing secondary vapor deposition on the parylene film layer on the assembled transformer; when a transformer with a magnetic core structure is adopted, parylene vapor deposition is carried out on the surface of the pretreated magnetic core to prepare a magnetic core with a parylene film layer, transformer winding is carried out on the magnetic core with the parylene film layer after vapor deposition, and secondary parylene film layer vapor deposition is carried out on the transformer after winding is completed. The problem of circuit failure caused by breakdown between the primary side and the secondary side of the transformer, discharge between the transformer and the tube shell and the like when the integrated circuit is mixed is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of hybrid integration, and relates to a method for improving the insulation withstand voltage of transformers through parylene vapor deposition. Background technique [0002] Electronic transformers are widely used in various types of hybrid integrated circuits such as isolation amplifiers, power modules, and power drivers. Performance parameters such as insulation strength and dielectric withstand voltage of electronic transformers are one of the important indicators that determine their application and circuit performance. Especially for hybrid integrated circuits with high working voltage and transformers with isolation function, during the test and use process, the voltage breakdown between the primary and secondary transformers, the discharge between the transformer and the circuit case, etc. may cause circuit failure problems. occur. In addition to its own defects such as enameled wire damage, the wea...

Claims

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Application Information

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IPC IPC(8): H01F27/34H01F27/32H01F27/02H01F41/00H01F41/12
CPCH01F27/34H01F27/324H01F27/327H01F27/022H01F41/005H01F41/125H01F41/127
Inventor 汤姝莉赵国良邵领会冯春苗薛亚慧
Owner XIAN MICROELECTRONICS TECH INST
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