3 results about "Ćuk converter" patented technology

This invention discloses a parallel equalization system based on a bidirectional CUK converter, comprising an equalization system module and a selection switch matrix module. The selection switch matrix module includes n sets of selection switch matrices, each set containing four selection switches. The positive terminal of the first battery is connected to the drain of the first selection switch, the source of the first selection switch is connected to the drain of the third selection switch, the source of the third selection switch is connected to the negative terminal of the first battery, the drain of the second selection switch is connected to the drain of the first selection switch, the source of the second selection switch is connected to the drain of the fourth selection switch, and the source of the fourth selection switch is connected to the source of the third selection switch. The equalization system module has multiple equalizers, each connected to a corresponding selection switch matrix. Each equalizer includes two inductors, one auxiliary power switch, one control power switch, and two capacitors. This system enables equalization of multiple series-parallel battery packs during charging and discharging, offering flexible equalization methods.

An improved dual Cuk DC-DC converter comprising 3 inductors, 3 capacitors, and 4 semiconductor elements, which meets the same performance requirements as a standard Cuk converter, thereby enabling a reduction in its size and cost.

The application provides a control method and a control system for active balancing of lithium ion batteries at a fusion temperature. The method comprises: obtaining the initial temperature and the initial state of charge of each cell of the lithium ion battery when the lithium ion battery is in the balancing mode; constructing a linear state prediction model; constructing a cost function and converting it into a quadratic programming problem with linear constraints and solving to obtain the optimal battery balancing current; adjusting the energy flow of the bidirectional Cuk converter bidirectional switch tube according to the optimal battery balancing current to adjust the battery balancing current; updating the state of charge of each cell and the temperature of each cell through the LSTM model and the preset constraints. In this way, by constructing an active balancing control method targeting the state of charge and temperature deviation of the cells, combining the fine current regulation capability of the bidirectional Cuk converter, the dynamic prediction and intelligent optimization control of the lithium ion battery state are realized, the balancing speed of the lithium ion battery is improved, the temperature difference during balancing is reduced, and the safety is improved.