Capacitance measurement circuit
A technology of capacitance capacitance and measurement circuit, which is applied in the direction of capacitance measurement, electric variable measurement, resistance/reactance/impedance measurement, etc. It can solve the problem of low measurement accuracy, improve measurement accuracy and avoid low measurement accuracy.
Active Publication Date: 2019-02-26
SHANGHAI EASTSOFT MICROELECTRONICS
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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
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[0023] In the prior art, a bridge method or a capacitive reactance method may be used to measure the capacitance value. The bridge method measures the capacitance value according to the principle of bridge balance, and the test accuracy is high, but the circuit is relatively complicated, the cost is high, and the volume is large.
[0024] When the capacitive reactance method is used to measure the capacitance value of the capacitor, the 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, 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 through the A / D sampling value obtained after ADC conversion. However, when the capacitive reactance method is used to measure the capacitance value of the capacitor, ...
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A capacitor capacitance measuring circuit comprises a controller, a to-be-tested capacitor, a capacitor charge and discharge unit, a timer, and a counter. The controller is suitable for outputting a charge control signal when the acquired voltage of the to-be-tested capacitor reaches a discharge completion voltage threshold, outputting a discharge control signal when the acquired voltage of the to-be-tested capacitor reaches a charge completion voltage threshold, calculating the average charge length of the to-be-tested capacitor after test, and calculating the capacitance of the to-be-tested capacitor according to the predetermined corresponding relationship between the charge length corresponding to a standard capacitor and the capacitance of the standard capacitor. The capacitor charge and discharge unit is suitable for forming a charge loop together with the to-be-tested capacitor under the control of the charge control signal, and making the to-be-tested capacitor discharge when receiving the discharge control signal. The timer is suitable for timing the whole charge process of the to-be-tested capacitor. The counter is suitable for recording the total number of charge times of the to-be-tested capacitor in the process of test. By using the scheme, the precision of capacitor capacitance measurement can be improved.
Description
technical field [0001] The invention relates to the field of component testing, in particular to a capacitance measuring circuit. Background technique [0002] In electrotechnical technology, capacitors are one of the most common components, and are widely used in DC blocking, coupling, bypass, tuning circuits, etc. in circuits. [0003] In practical applications, various methods can be used to measure the capacitance value, for example, the bridge method is used to measure the capacitance value, and the capacitance reactance method is used to measure the capacitance value. [0004] When the capacitive reactance method is used to measure the capacitance value of the capacitor, the 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, the effective value voltage...
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IPC IPC(8): G01R27/26
CPCG01R27/2605
Inventor 万峰张旭陈光胜江友志
Owner SHANGHAI EASTSOFT MICROELECTRONICS