Lossless dynamic voltage equalization circuit and circuit control method

Abstract

The invention discloses a lossless dynamic voltage-sharing circuit, which comprises a standard voltage-sharing circuit, a voltage division circuit, a switching power supply and a dynamic feedback circuit, wherein the standard voltage-sharing circuit consists of a first capacitor, a first resistor, a second capacitor and a second resistor; the voltage division circuit is connected in parallel with the standard voltage-sharing circuit, and is formed by connecting a third resistor and a fourth resistor in series in sequence; the first capacitor and the first resistor are connected in parallel to form a first energy storing unit; the second capacitor and the second resistor are connected in parallel to form a second energy storing unit; the first energy storing unit and the second energy storing unit are connected in series; the first energy storing unit is connected with the high-potential output end of a direct current power supply; the second energy storing unit is connected with the low-potential output end of the direct current power supply; the two ends of the first energy storing unit are connected to corresponding input end of the switching power supply respectively; and the dynamic feedback circuit consists of a voltage comparator, a conjunction gate logical device, a PWM (Pulse-Width Modulation) wave generator, a switch tube and a single-end flyback converter. According to the lossless dynamic voltage-sharing circuit, the capacitor energy is fully utilized in a lossless way. The invention further discloses a control method.

Description

technical field [0001] The invention relates to a voltage equalizing circuit and a control method, in particular to a voltage equalizing circuit and a control method for series capacitors. Background technique [0002] A supercapacitor is a new type of energy storage element that uses the principle of an electric double layer to directly store electrical energy. Its capacity can reach tens of thousands of farads, and its energy is significantly higher than that of traditional electrostatic capacitors, while its specific power maintains the advantages of electrostatic capacitors. Supercapacitors have the advantages of long cycle life, wide operating temperature range, high specific power, fast charging and discharging, and environmental friendliness. However, the operating voltage of supercapacitors is usually very low. When used as an energy storage unit, a series-parallel combination of multiple supercapacitors must be used to form an energy storage module to meet the needs...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a lossless dynamic voltage equalizing circuit, which solves the technical problems of insufficient withstand voltage of switching tubes in switching power supplies, unbalanced circuit voltage in series capacitors, and low energy utilization efficiency.

[0006] Another object of the present invention is to provide a control method using the above-mentioned circuit for power feedback to solve the technical problem of power loss and waste caused by low power utilization and voltage imbalance

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