Capacitance measurement circuit
A technology for measuring capacitance and measuring circuits, which is applied in the direction of measuring electrical variables, measuring resistance/reactance/impedance, measuring devices, etc., can solve the problem of low measurement accuracy, achieve the effect of improving accuracy and avoiding low measurement accuracy
Active Publication Date: 2019-08-27
SHANGHAI EASTSOFT MICROELECTRONICS
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] However, when the capacitive reactance method is used to measure the capacitance value of the capacitor, the measurement accuracy is low due to the internal resistance of the capacitor
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0020] In the prior art, the bridge method or the capacitive reactance method can be used to measure the capacitance value. The bridge method measures the capacitance value according to the bridge balance principle, and the test accuracy is high, but the circuit is more complicated, the cost is high, and the volume is large.
[0021] When the capacitive reactance method is used to measure the capacitance of a capacitor, an AC sine wave signal is applied to the measured capacitor, and then the capacitance-voltage conversion is performed, and then the interference signal is filtered through a band-pass filter. Then, the effective value voltage proportional to the capacitance value of the capacitor to be measured is obtained through the AC / DC converter, and then the capacitance value is calculated by the A / D sampling value obtained after ADC conversion. However, when the capacitive reactance method is used to measure the capacitance value of a capacitor, the measurement accuracy is ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
A capacitance measuring circuit for a capacitor comprises a controller, a to-be-measured capacitor, a capacitor charging-and-discharging unit and a voltage sampling unit, wherein the controller is suitable for outputting a charging control signal to the capacitor charging-and-discharging unit in one measurement period; outputting a discharging control signal to the capacitor charging-and-discharging unit when a time length in outputting the charging control signal reaches a preset time length; calculating a voltage change amount of the to-be-measured capacitor in the measurement period; and calculating the capacitance of the to-be-measured capacitor according to a preset correspondence between a standard capacitance and the voltage change amount. The capacitor charging-and-discharging unit is suitable for forming a charging loop with the to-be-measured capacitor through controlling of the charging control signal, and forming a discharging loop with the to-be-measured capacitor through controlling of the discharging control signal. The voltage sampling unit is suitable for acquiring the voltage of the to-be-measured capacitor. The capacitance measuring circuit can effectively improve capacitance measurement precision.
Description
Technical field [0001] The invention relates to the field of component testing, in particular to a capacitance measuring circuit. Background technique [0002] In electrical technology, capacitors are one of the most common components, which are widely used in applications such as direct-through AC, coupling, bypass, and tuning loops in circuits. [0003] In practical applications, a variety of methods can be used to measure the capacitance value, for example, the bridge method is used to measure the capacitance value, and the capacitive reactance method is used to measure the capacitance value. [0004] When the capacitive reactance method is used to measure the capacitance of a capacitor, an AC sine wave signal is applied to the measured capacitor, and then the capacitance-voltage conversion is performed, and then the interference signal is filtered out through a band-pass filter. Then, through an AC / DC (Alternating Current / Direct Current, AC / DC) converter, an effective value volt...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/26
Inventor 万峰张旭陈光胜邹旋
Owner SHANGHAI EASTSOFT MICROELECTRONICS