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Manufacturing method for adjustable capacitor and adjustable capacitor

A manufacturing method and capacitor technology, applied in the field of automobiles, can solve the problems that capacitors cannot be applied to the performance test of automobile engine ignition coils, etc., and achieve the effects of wide range of capacitance adjustment, simple operation, and meeting the requirements of adjustment accuracy

Inactive Publication Date: 2014-11-19
BEIJING DELPHI TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing capacitors cannot be applied to the performance test of the ignition coil of an automobile engine, the invention provides a method for manufacturing an adjustable capacitor and an adjustable capacitor

Method used

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  • Manufacturing method for adjustable capacitor and adjustable capacitor
  • Manufacturing method for adjustable capacitor and adjustable capacitor
  • Manufacturing method for adjustable capacitor and adjustable capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] In step S101,

[0063] Select the intermediate dielectric layer and the thickness of the intermediate dielectric layer:

[0064] Some commonly used polymers used as intermediate dielectric layers and some parameters of polymers such as image 3 As shown, since there are many types of polymers commonly used, here, the image 3 Take nylon 66 as an example:

[0065] Depend on image 3 It can be seen from the parameters of nylon 66 in the figure that the breakdown strength of nylon 66 ranges from (15 to 19) MV / m. Due to differences in the manufacturing process, the breakdown strength of the same material will also vary. Therefore, when calculating the thickness of the intermediate dielectric layer, the lowest value of the intermediate dielectric layer is usually selected to ensure the safety of the adjustable capacitor. Set the measured voltage of the adjustable capacitor to 40KV, the breakdown strength of nylon 66 is 15MV / m, according to the voltage measurement formula...

Embodiment 2

[0071] In step S102 and step S103:

[0072] The intermediate dielectric layer is machined to form a hollow cylinder with one end open and the other end closed with a suitable radius, the inner polar plate is placed in the intermediate dielectric layer, and the outer polar plate is screwed to the outer surface of the intermediate dielectric layer.

[0073] The capacitance calculation formula for cylindrical capacitors is:

[0074] C 0 = 2 πϵl ln R B R A - - - ( 2 )

[0075] in,

[0076] C 0 is the capacitance generated between the inner pole plate and the outer pole plate, in this embodiment, C 0 is the capacitance generated between the inner an...

Embodiment 3

[0102] In step S102 and step S103:

[0103] According to the capacitance value C between the inner plate and the outer plate 0 , the thickness of the intermediate dielectric layer d, and formula (3), the preliminary determination of R A and R B , R A and R B cannot be selected too small or too large when R A and R B Too small, the capacitance value is too small; when R A and R B When it is too large, it is inconvenient to operate. R A with R B After determination, the length l of the pole plate can be obtained according to formula (2). Then C can be inversely calculated according to (4) 内 , C 外 , to obtain the adjustment range of the capacitance value. If there is a gap between the adjustment range of the obtained capacitance value and the target range, R can be adjusted according to the deviation of the result A and R B , and repeat this process until the target range of capacitance is obtained.

[0104] Thus, when R A , R B , l After confirmation, the heigh...

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Abstract

The invention provides a manufacturing method for an adjustable capacitor and the adjustable capacitor. The manufacturing method and the adjustable capacitor are applied to a performance test of an automobile ignition coil. The manufacturing method for the adjustable capacitor comprises the following steps: selecting the thickness of an intermediate dielectric layer according to the tested voltage of the adjustable capacitor and the breakdown strength of the intermediate dielectric layer; machining the intermediate dielectric layer to form a hollow cylinder body; arranging threads on the outer surface of the intermediate dielectric layer; selecting at least one cylindrical replaceable cushion block, and placing the at least one cylindrical replaceable cushion block in the intermediate dielectric layer, wherein the replaceable cushion block is made of dielectric material or metal material; placing an inner polar plate above the replaceable cushion block in the intermediate dielectric layer; performing threaded connection on an outer polar plate and the outer surface of the intermediate dielectric layer, wherein the outer polar plate can do spiral motion on the outer surface of the intermediate dielectric layer. The manufacturing method for the adjustable capacitor, provided by the invention, is simple in operation; the adjustable capacitor manufactured by the manufacturing method for the adjustable capacitor has the advantages of high voltage resistance, wide capacitance adjustment range and high adjustment precision.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a method for manufacturing an adjustable capacitor used in the performance test of an ignition coil and the adjustable capacitor. Background technique [0002] During the performance test of the ignition coil of an automobile engine, the secondary load requires an accurate capacitive load, and the capacitive load is about ±1PF. Since the required capacitance value is small, the capacitance value is about (10-50)PF, which is high-voltage resistant The requirements are very high, the measured voltage value can reach 40KV, it is difficult to find a capacitor that meets the above conditions, the existing technology does not have a capacitor for the test of the automobile ignition coil, and the commonly used PF grade adjustable capacitor cannot withstand the high voltage of the automobile engine ignition coil, and can withstand 40KV Most high-voltage capacitors are not adjustable or cannot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G5/013H01G5/04H01G5/14
Inventor 杨辉韩燕斐牛伟
Owner BEIJING DELPHI TECH DEV
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