A voltage equalizing circuit for supercapacitors

Abstract

The invention discloses a novel super capacitor voltage equalizing circuit. The novel super capacitor voltage equalizing circuit comprises a control circuit, resistors, an audion and a super capacitor, wherein the control circuit is formed by an operational amplifier and the resistor R3 which are series connection, a reference voltage is input into the negative input end of the operational amplifier through the resistor R1, the positive input end of the operational amplifier is connected with a VCC, the output end of the operational amplifier is connected with one end of the resistor R3 through a wire, the other end of the resistor R3 is connected with the base electrode of the audion, the emitting electrode of the audion is connected back to the collector electrode of the audion through a wire via the super capacitor and the resistor R4, one end of the resistor R2 is connected to the negative input end of the operational amplifier, the other end of the resistor R2 is connected to the collector electrode of the audion, a positive power supply terminal of the operational amplifier is connected with the VCC, and a negative power supply terminal of the operational amplifier is grounded. The novel super capacitor voltage equalizing circuit is simple in structure and stable and reliable in working.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a supercapacitor voltage equalizing circuit. Background technique [0002] With the outstanding requirements of environmental problems and the development of new technologies, new energy vehicles and special vehicles have emerged at the historic moment. The starting power supply system of these vehicles uses a large number of super capacitors to solve the instantaneous high power problem, thereby greatly improving the service life of the battery. Pressure equalization technology is an urgent problem to be solved at present. [0003] The rated voltage of supercapacitors is very low, and a large number of series connections are required in the application. Since the application often requires high current charging and discharging, it is very important whether the voltage on each single capacitor in series is consistent. The factors that affect whether the voltage of the s...

AI Technical Summary

Problems solved by technology

The factors that affect whether the voltage of the supercapacitor is equally divided mainly include: capacitance, ESR, leakage current, etc. Although these parameters have little influence on the voltage of the supercapacitor in the early stage of application, but in the middle and late stages of supercapacitor application, As the discreteness of these parameters becomes larger, the influence on the voltage sharing of the supercapacitor increases, which eventually leads to a sharp shortening of the life of the supercapacitor

If the necessary voltage equalization measures are not taken, the voltage on each single capacitor will be large, and it is not advisable to use more series numbers to solve the problem

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