Supercapacitor charging circuit, charging method and transient wave recording type fault indicator

Abstract

The invention discloses a supercapacitor charging circuit. The supercapacitor charging circuit comprises a reference voltage circuit, a voltage sampling circuit, a subtracter circuit and a switching tube module; a current transformer charges a supercapacitor through the switching tube module; the voltage sampling circuit samples voltage output by the current transformer and inputs the voltage into the subtracter circuit; the subtracter circuit subtracts a reference voltage signal of the reference voltage circuit from a sampling signal to produce a control signal to control work of the switching tube module, so that charging of the supercapacitor is controlled. The invention further discloses a charging method of the supercapacitor charging circuit. The method comprises the following steps: sampling the voltage of the current transformer; judging whether the supercapacitor is needed to be charged according to the voltage sampling value of the current transformer, the voltage sampling value at the supercapacitor end, a first voltage reference value and a second voltage reference value. The invention further discloses a transient wave recording type fault indicator adopting the charging circuit and the charging method. Non-polarized charging of the supercapacitor is realized, charging current is controlled according to the loading capacity of the current transformer, and the charging efficiency is quite high.

Description

technical field [0001] The invention specifically relates to a supercapacitor charging circuit, a charging method and a transient recorder fault indicator thereof. Background technique [0002] With the development of economy and technology and the improvement of people's living standards, there are more and more requirements for uninterrupted power supply of electrical or electronic equipment. As the core technology of uninterrupted power supply, multi-power supply technology has been widely developed and applied. Supercapacitors have been widely favored by people for their advantages such as high power density, long service life, and wide operating temperature range, and have firmly occupied the position of backup power in multi-power supply technology. [0003] There has been a large amount of information on the charging and discharging circuit of supercapacitors. However, the existing technology basically controls the charging current by dividing the resistance into tw...

AI Technical Summary

Problems solved by technology

However, the existing technology basically controls the charging current by dividing the resistance into two or more gears. First, the gears are limited, and the charging current cannot be adjusted in real time according to the power provided by the CT (current transformer). The more bits, the more complex the circuit; and for the system powered by the current transformer, whether it uses constant current charging or constant voltage charging, it will cause unreasonable use of electric energy. Under the small primary current, the electric energy obtained by the current transformer sometimes Just to keep the system running, turning on the charging at this time will cause the system to have insufficient power; finally, the existing technology cannot accurately determine when the current transformer has excess energy for charging

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