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Capacitor measuring system and measuring method thereof

A technology of capacitance and resistance, which is applied in the field of capacitance measurement method and measurement capacitance system, can solve the problems of cumulative measurement accuracy, unfavorable error, and improvement, and achieve the effects of simple circuit structure, improved accuracy, and simple and convenient measurement method

Pending Publication Date: 2018-01-05
ESPRESSIF SYST SHANGHAI
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  • Description
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  • Application Information

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Problems solved by technology

The existing technology measures the charging or discharging time of the capacitor separately when measuring the capacitance value, which has certain limitations, which is not conducive to the accumulation of errors and the improvement of measurement accuracy

Method used

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  • Capacitor measuring system and measuring method thereof
  • Capacitor measuring system and measuring method thereof
  • Capacitor measuring system and measuring method thereof

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Embodiment Construction

[0039] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0040] Such as figure 1 Shown, a kind of measurement capacitance system of the present invention comprises: charging current source I b1 , one end of which is connected to the current voltage VDD; the other end is electrically connected to the first end of the capacitor under test through the first control switch SW1; the second end of the capacitor under test is grounded.

[0041] Discharge current source I b2 , one end of which is grounded, and the other end is electrically connected to the first end of the capacitor to be measured through the second control switch SW2.

[0042] Comparator group 1, its input end is connected with the first end of above-mentioned capacitance to be measured; Above-mentioned capacitance to be measured provides initial comparative voltage value for comparator group 1, namely the ...

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Abstract

The invention discloses a capacitor measuring system and a measuring method thereof. The system comprises a charging current source which charges a capacitor to be measured, a comparator group whose input end is connected to a first end of the capacitor to be measured, the capacitor to be measured which provides an initial comparison voltage value which is a voltage value Vcap of the capacitor tobe measured to the comparator group, a latch whose input end is electrically connected to an output end of the comparator group, and a counter group which is connected to the output end of the latch and is used for counting a period of a level signal outputted by the latch, wherein a first output end of the latch is correspondingly connected to a first control switch, a second output end of the latch is connected to a second control switch. The system and the method have the advantages of a simple circuit structure, a simple and convenient measurement method, low measurement cost and high measurement precision.

Description

technical field [0001] The invention relates to the field of capacitance measurement, in particular to a capacitance measurement method and a capacitance measurement system. Background technique [0002] Capacitance measurement technology is widely used in various fields, such as touch sensing, distance sensing and so on. In the existing technology, when measuring the capacitance value, the charging or discharging time of the capacitance is measured separately, which has certain limitations, which is not conducive to the accumulation of errors and the improvement of measurement accuracy. Contents of the invention [0003] The object of the present invention is to provide a kind of measurement capacitance system and its measurement method; Control the charging and discharging of the capacitance to be measured by the latch, so that the process of charging and discharging of the capacitance to be measured is quickly connected, which is convenient for the accumulation of measu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
CPCG01R27/26
Inventor 王强
Owner ESPRESSIF SYST SHANGHAI
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