Charging and discharging device and method for electrolytic capacitor leakage current/insulation resistance measuring instrument
A technology for measuring insulation resistance and electrolytic capacitors, which is applied in the field of capacitor insulation resistance measuring devices, can solve the problems of reduced charging current, large charging current, and reduced charging efficiency, and achieves shortened charging and discharging time, improved efficiency, and improved system reliability. Effect
Active Publication Date: 2017-05-10
SOUTHEAST UNIV +1
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Problems solved by technology
Analyzing the charging process, the charging current is large at the beginning, and as the voltage across the measured capacitor C gradually rises / falls, the charging current gradually decreases, and the charging efficiency gradually decreases
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[0022] The present invention will be further described below in conjunction with the accompanying drawings.
[0023] In order to improve efficiency, this case proposes to use constant current charging when the voltage across the capacitor is much lower than the predetermined voltage during the charging process, and to use constant voltage charging when it is close to the predetermined voltage. The larger the charging current, the shorter the charging time and the higher the efficiency. But for the electrolytic capacitor insulation resistance measuring instrument, if the charging current is too large, the charging slope will be too high, which will easily form overshoot, cause the polarity of the electrolytic capacitor charging current to reverse, and cause measurement errors, which are reflected in the measurement of leakage current / insulation resistance. The measured value is negative and cannot be used normally; in addition, in the process of capacitor leakage current / insula...
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The invention discloses a charging and discharging device and method for an electrolytic capacitor leakage current / insulation resistance measuring instrument. The device includes a high-voltage signal source, a high-voltage diode D, a constant-current / constant-voltage charging control module, a high-voltage relay K1, a constant-power / constant-current discharging adjustment module, a leakage current measuring module, a voltage dividing resistance network R, a precision current sampling resistor Rs, a power triode Q1, a high-voltage field effect transistor Q2 and a microprocessor; in a charging process, charging voltage and charging current are monitored, and constant-current charging or constant-voltage charging in the charging process can be realized through the constant-current / constant-voltage charging control module; after capacitor leakage current / insulation resistance measurement is completed, the gate voltage of the Q2 is adjusted through the constant-power / constant-current discharging adjustment module; when discharging current is lower than a system discharging current threshold value, constant-power discharging is realized; and when the discharging current reaches the system discharging current threshold value, constant-current discharging is realized. With the charging and discharging device and method for the electrolytic capacitor leakage current / insulation resistance measuring instrument of the present invention adopted, the charging and discharging efficiency of an electrolytic capacitor can be improved.
Description
technical field [0001] The invention relates to a capacitor insulation resistance measurement device, in particular to a flexible and efficient charging and discharging device and method in the process of measuring the insulation resistance of an electrolytic capacitor. Background technique [0002] The measurement of the insulation performance of electrolytic capacitors is an important part of the safety inspection of electrolytic capacitors. The leakage current / insulation resistance measurement process of electrolytic capacitors is: capacitor charging + leakage current / insulation resistance measurement + capacitor discharge. When measuring leakage current / insulation resistance, it must be ensured that the capacitor is fully charged, otherwise the current value during measurement will contain a charging current component, and the charging current will slowly decrease as it enters a steady state, resulting in large errors in the measurement; After the measurement is complete...
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IPC IPC(8): H02J7/00H01M10/44
CPCH01M10/44H02J7/0026H02J7/0036H02J7/0072Y02E60/10
Inventor 王晓俊黄永升李建宇陈涛罗鸿飞牛丹赵永杰
Owner SOUTHEAST UNIV
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