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Capacitor inspecting method

A test method and capacitance technology, which is applied in the directions of measuring electricity, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve the problems affecting the overall performance of the circuit and poor decoupling effect, so as to reduce the calibration error and ensure the application effect of effect

Inactive Publication Date: 2015-06-10
DALIAN DONGPU MECHANICAL & ELECTRICAL
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Capacitors are essential electronic components in electronic circuits, and are widely used in DC blocking, coupling, bypass, filtering, tuning loops, energy conversion and control circuits, etc., and their accuracy directly affects the reliability and reliability of electronic circuits. Circuit performance, capacitance can be divided into ordinary capacitance and precision capacitance due to the difference in nominal accuracy, the accuracy ranges from ±20% to ±0.5%, the size of capacitance C is affected by capacitance material, shape, distance between plates, temperature , humidity and other factors, so the actual capacitance value of the capacitor with the same nominal value often has a certain difference, so it is very necessary to check the capacitance value of the capacitor in actual use, especially for decoupling circuits The capacitance of the decoupling capacitor, the capacitance accuracy of the decoupling capacitor is not enough will directly lead to poor decoupling effect, and then affect the overall performance of the circuit

Method used

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  • Capacitor inspecting method

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Embodiment Construction

[0016] Such as figure 1 A capacitance inspection method shown comprises the following steps:

[0017] ①Apply a sinusoidal alternating current with a frequency of 50 Hz and an effective value of voltage U at both ends of the circuit formed by the capacitor to be measured and the resistor R of known resistance in series;

[0018] ②The voltage U across the detection resistor R R ;

[0019] ③Calculate the voltage U across the capacitor to be tested C =U-U R ;

[0020] ④Calculate the series loop current I=U formed by the capacitance to be measured and the resistance R R / R;

[0021] ⑤ According to the calculated voltage U across the capacitor to be measured C and the loop current I using the formula C=I / (U C ×2 π f) Get the capacitance value C of the capacitor to be tested;

[0022] ⑥ Verify the difference of the capacitance C of the capacitance to be measured according to the capacitance value of the reference capacitance under the condition of sinusoidal alternating curr...

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Abstract

The invention discloses a capacitor inspecting method. The method includes: applying sine alternating currents with the frequency of 50Hz and voltage effective value of U to two ends of a loop formed by a to-be-inspected capacitor and a resistor R with known resistance; detecting the voltage UR at two ends of the resistor R; calculating the voltage UC at two ends of the to-be-inspected capacitor according to UC=U-UR; calculating the current I of a serial loop formed by the to-be-inspected capacitor and the resistor R according to I=UR / R; using the formula C=I / (UC*2 pi f) to obtain the capacitance C of the to-be-inspected capacitor according to the calculated UC and I; performing difference value verification on the capacitance C according the capacitance of a reference capacitor under the sine alternating currents with the frequency of 50Hz. By the method, verification errors can be reduced effectively, accuracy and practicality are achieved, actual application requirements can be satisfied conveniently, capacitor screening can be performed, and the application effect of the to-be-inspected capacitor is guaranteed favorably.

Description

technical field [0001] The invention relates to a capacitance testing method. Background technique [0002] Capacitors are essential electronic components in electronic circuits, and are widely used in DC blocking, coupling, bypass, filtering, tuning loops, energy conversion and control circuits, etc., and their accuracy directly affects the reliability and reliability of electronic circuits. Circuit performance, capacitance can be divided into ordinary capacitance and precision capacitance due to the difference in nominal accuracy, the accuracy ranges from ±20% to ±0.5%, the size of capacitance C is affected by capacitance material, shape, distance between plates, temperature , humidity and other factors, so the actual capacitance value of the capacitor with the same nominal value often has a certain difference, so it is very necessary to check the capacitance value of the capacitor in actual use, especially for decoupling circuits Insufficient capacitance accuracy of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R27/26
Inventor 王榕英
Owner DALIAN DONGPU MECHANICAL & ELECTRICAL
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