Bus type energy storage element balance circuit, system and method based on quasi-resonance bidirectional DC-DC CUK converter

Abstract

The invention provides a bus type energy storage element balance circuit, system and method based on the quasi-resonance bidirectional DC-DC CUK converter; according to the bus type energy storage element balance circuit, the positive electrode output end of a first balance circuit is connected with the positive electrode end of a balance bus; the negative electrode output end of the first balancecircuit is connected with the negative electrode end of the balance bus; the positive electrode output end of a second balance circuit is connected with the positive electrode end of the balance bus,and the negative electrode output end of the second balance circuit is connected with the negative electrode end of the balance bus; the positive electrode output end of the N balance circuit isconnected with the positive electrode end of the balance bus; and the negative electrode output end of the Nbalance circuit is connected with the negative electrode end of the balance bus, whereinN is a positive integer. By using the balance circuit in the balance bus, balance of energy in the bus is achieved, so that the operation of the balance bus system is more stable and smoother, and the energy loss is lower.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to a bus-type energy storage element equalization circuit, system and method based on a quasi-resonant bidirectional DC-DC CUK converter. Background technique [0002] The DC converter circuit generally adopts PWM control mode, and the switching tube works in a hard switching state. Bidirectional DC-DCCuk converter is a typical DC converter, its structure is as follows Figure 8 shown. Since the switch tube is not an ideal device, the voltage of the switch does not drop to zero immediately when it is turned on, but has a falling time, and its current does not immediately rise to the load current, but also has a rising time. During this time, the current and voltage have an overlapping region, resulting in losses, which we call turn-on losses. When the switch tube is turned off, the voltage of the switch tube does not immediately rise from zero to the power supply voltage, but has ...

AI Technical Summary

Problems solved by technology

The existence of the switch limits the increase of the switching frequency of the converter, thus limiting the miniaturization and weight reduction of the converter

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